aabe3ed736
Review URL: http://codereview.chromium.org/4298 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@387 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
6394 lines
206 KiB
C++
6394 lines
206 KiB
C++
// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#include "api.h"
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#include "bootstrapper.h"
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#include "debug.h"
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#include "execution.h"
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#include "objects-inl.h"
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#include "macro-assembler.h"
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#include "scanner.h"
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#include "scopeinfo.h"
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#include "string-stream.h"
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#ifdef ENABLE_DISASSEMBLER
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#include "disassembler.h"
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#endif
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namespace v8 { namespace internal {
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// Getters and setters are stored in a fixed array property. These are
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// constants for their indices.
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const int kGetterIndex = 0;
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const int kSetterIndex = 1;
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bool Object::IsInstanceOf(FunctionTemplateInfo* expected) {
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// There is a constraint on the object; check
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if (!this->IsJSObject()) return false;
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// Fetch the constructor function of the object
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Object* cons_obj = JSObject::cast(this)->map()->constructor();
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if (!cons_obj->IsJSFunction()) return false;
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JSFunction* fun = JSFunction::cast(cons_obj);
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// Iterate through the chain of inheriting function templates to
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// see if the required one occurs.
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for (Object* type = fun->shared()->function_data();
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type->IsFunctionTemplateInfo();
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type = FunctionTemplateInfo::cast(type)->parent_template()) {
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if (type == expected) return true;
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}
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// Didn't find the required type in the inheritance chain.
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return false;
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}
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static Object* CreateJSValue(JSFunction* constructor, Object* value) {
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Object* result = Heap::AllocateJSObject(constructor);
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if (result->IsFailure()) return result;
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JSValue::cast(result)->set_value(value);
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return result;
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}
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Object* Object::ToObject(Context* global_context) {
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if (IsNumber()) {
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return CreateJSValue(global_context->number_function(), this);
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} else if (IsBoolean()) {
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return CreateJSValue(global_context->boolean_function(), this);
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} else if (IsString()) {
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return CreateJSValue(global_context->string_function(), this);
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}
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ASSERT(IsJSObject());
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return this;
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}
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Object* Object::ToObject() {
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Context* global_context = Top::context()->global_context();
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if (IsJSObject()) {
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return this;
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} else if (IsNumber()) {
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return CreateJSValue(global_context->number_function(), this);
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} else if (IsBoolean()) {
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return CreateJSValue(global_context->boolean_function(), this);
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} else if (IsString()) {
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return CreateJSValue(global_context->string_function(), this);
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}
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// Throw a type error.
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return Failure::InternalError();
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}
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Object* Object::ToBoolean() {
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if (IsTrue()) return Heap::true_value();
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if (IsFalse()) return Heap::false_value();
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if (IsSmi()) {
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return Heap::ToBoolean(Smi::cast(this)->value() != 0);
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}
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if (IsUndefined() || IsNull()) return Heap::false_value();
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// Undetectable object is false
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if (IsUndetectableObject()) {
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return Heap::false_value();
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}
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if (IsString()) {
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return Heap::ToBoolean(String::cast(this)->length() != 0);
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}
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if (IsHeapNumber()) {
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return HeapNumber::cast(this)->HeapNumberToBoolean();
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}
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return Heap::true_value();
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}
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void Object::Lookup(String* name, LookupResult* result) {
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if (IsJSObject()) return JSObject::cast(this)->Lookup(name, result);
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Object* holder = NULL;
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Context* global_context = Top::context()->global_context();
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if (IsString()) {
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holder = global_context->string_function()->instance_prototype();
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} else if (IsNumber()) {
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holder = global_context->number_function()->instance_prototype();
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} else if (IsBoolean()) {
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holder = global_context->boolean_function()->instance_prototype();
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}
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#ifdef DEBUG
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// Used to track outstanding bug #1308895.
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// TODO(1308895) Remove when bug is fixed.
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if (holder == NULL) {
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PrintF("\nName being looked up: ");
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name->Print();
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PrintF("\nThis (object name is looked up in: ");
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this->Print();
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if (IsScript()) {
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PrintF("IsScript() returns true.\n");
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}
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}
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#endif
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ASSERT(holder != NULL); // cannot handle null or undefined.
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JSObject::cast(holder)->Lookup(name, result);
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}
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Object* Object::GetPropertyWithReceiver(Object* receiver,
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String* name,
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PropertyAttributes* attributes) {
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LookupResult result;
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Lookup(name, &result);
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return GetProperty(receiver, &result, name, attributes);
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}
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Object* Object::GetPropertyWithCallback(Object* receiver,
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Object* structure,
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String* name,
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Object* holder) {
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// To accommodate both the old and the new api we switch on the
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// data structure used to store the callbacks. Eventually proxy
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// callbacks should be phased out.
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if (structure->IsProxy()) {
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AccessorDescriptor* callback =
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reinterpret_cast<AccessorDescriptor*>(Proxy::cast(structure)->proxy());
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Object* value = (callback->getter)(receiver, callback->data);
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RETURN_IF_SCHEDULED_EXCEPTION();
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return value;
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}
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// api style callbacks.
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if (structure->IsAccessorInfo()) {
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AccessorInfo* data = AccessorInfo::cast(structure);
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Object* fun_obj = data->getter();
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v8::AccessorGetter call_fun = v8::ToCData<v8::AccessorGetter>(fun_obj);
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HandleScope scope;
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Handle<JSObject> self(JSObject::cast(receiver));
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Handle<JSObject> holder_handle(JSObject::cast(holder));
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Handle<String> key(name);
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Handle<Object> fun_data(data->data());
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LOG(ApiNamedPropertyAccess("load", *self, name));
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v8::AccessorInfo info(v8::Utils::ToLocal(self),
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v8::Utils::ToLocal(fun_data),
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v8::Utils::ToLocal(holder_handle));
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v8::Handle<v8::Value> result;
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{
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// Leaving JavaScript.
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VMState state(OTHER);
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result = call_fun(v8::Utils::ToLocal(key), info);
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}
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RETURN_IF_SCHEDULED_EXCEPTION();
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if (result.IsEmpty()) return Heap::undefined_value();
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return *v8::Utils::OpenHandle(*result);
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}
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// __defineGetter__ callback
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if (structure->IsFixedArray()) {
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Object* getter = FixedArray::cast(structure)->get(kGetterIndex);
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if (getter->IsJSFunction()) {
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HandleScope scope;
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Handle<JSFunction> fun(JSFunction::cast(getter));
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Handle<Object> self(receiver);
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bool has_pending_exception;
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Object* result =
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*Execution::Call(fun, self, 0, NULL, &has_pending_exception);
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// Check for pending exception and return the result.
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if (has_pending_exception) return Failure::Exception();
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return result;
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}
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// Getter is not a function.
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return Heap::undefined_value();
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}
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UNREACHABLE();
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return 0;
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}
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// Only deal with CALLBACKS and INTERCEPTOR
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Object* JSObject::GetPropertyWithFailedAccessCheck(Object* receiver,
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LookupResult* result,
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String* name) {
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if (result->IsValid()) {
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switch (result->type()) {
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case CALLBACKS: {
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// Only allow API accessors.
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Object* obj = result->GetCallbackObject();
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if (obj->IsAccessorInfo()) {
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AccessorInfo* info = AccessorInfo::cast(obj);
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if (info->all_can_read()) {
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return GetPropertyWithCallback(receiver,
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result->GetCallbackObject(),
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name,
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result->holder());
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}
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}
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break;
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}
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case NORMAL:
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case FIELD:
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case CONSTANT_FUNCTION: {
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// Search ALL_CAN_READ accessors in prototype chain.
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LookupResult r;
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result->holder()->LookupRealNamedPropertyInPrototypes(name, &r);
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if (r.IsValid()) {
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return GetPropertyWithFailedAccessCheck(receiver, &r, name);
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}
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break;
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}
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case INTERCEPTOR: {
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// If the object has an interceptor, try real named properties.
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// No access check in GetPropertyAttributeWithInterceptor.
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LookupResult r;
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result->holder()->LookupRealNamedProperty(name, &r);
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if (r.IsValid()) {
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return GetPropertyWithFailedAccessCheck(receiver, &r, name);
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}
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break;
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}
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default: {
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break;
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}
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}
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}
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Top::ReportFailedAccessCheck(this, v8::ACCESS_GET);
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return Heap::undefined_value();
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}
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Object* JSObject::GetLazyProperty(Object* receiver,
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LookupResult* result,
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String* name,
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PropertyAttributes* attributes) {
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HandleScope scope;
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Handle<Object> this_handle(this);
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Handle<Object> receiver_handle(receiver);
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Handle<String> name_handle(name);
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bool pending_exception;
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LoadLazy(Handle<JSFunction>(JSFunction::cast(result->GetValue())),
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&pending_exception);
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if (pending_exception) return Failure::Exception();
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return this_handle->GetPropertyWithReceiver(*receiver_handle,
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*name_handle,
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attributes);
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}
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Object* JSObject::SetLazyProperty(LookupResult* result,
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String* name,
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Object* value,
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PropertyAttributes attributes) {
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HandleScope scope;
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Handle<JSObject> this_handle(this);
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Handle<String> name_handle(name);
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Handle<Object> value_handle(value);
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bool pending_exception;
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LoadLazy(Handle<JSFunction>(JSFunction::cast(result->GetValue())),
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&pending_exception);
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if (pending_exception) return Failure::Exception();
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return this_handle->SetProperty(*name_handle, *value_handle, attributes);
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}
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Object* JSObject::DeleteLazyProperty(LookupResult* result, String* name) {
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HandleScope scope;
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Handle<JSObject> this_handle(this);
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Handle<String> name_handle(name);
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bool pending_exception;
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LoadLazy(Handle<JSFunction>(JSFunction::cast(result->GetValue())),
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&pending_exception);
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if (pending_exception) return Failure::Exception();
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return this_handle->DeleteProperty(*name_handle);
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}
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Object* Object::GetProperty(Object* receiver,
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LookupResult* result,
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String* name,
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PropertyAttributes* attributes) {
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// Make sure that the top context does not change when doing
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// callbacks or interceptor calls.
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AssertNoContextChange ncc;
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// Traverse the prototype chain from the current object (this) to
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// the holder and check for access rights. This avoid traversing the
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// objects more than once in case of interceptors, because the
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// holder will always be the interceptor holder and the search may
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// only continue with a current object just after the interceptor
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// holder in the prototype chain.
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Object* last = result->IsValid() ? result->holder() : Heap::null_value();
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for (Object* current = this; true; current = current->GetPrototype()) {
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if (current->IsAccessCheckNeeded()) {
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// Check if we're allowed to read from the current object. Note
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// that even though we may not actually end up loading the named
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// property from the current object, we still check that we have
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// access to the it.
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JSObject* checked = JSObject::cast(current);
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if (!Top::MayNamedAccess(checked, name, v8::ACCESS_GET)) {
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return checked->GetPropertyWithFailedAccessCheck(receiver,
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result,
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name);
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}
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}
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// Stop traversing the chain once we reach the last object in the
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// chain; either the holder of the result or null in case of an
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// absent property.
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if (current == last) break;
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}
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if (!result->IsProperty()) {
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*attributes = ABSENT;
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return Heap::undefined_value();
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}
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*attributes = result->GetAttributes();
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if (!result->IsLoaded()) {
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return JSObject::cast(this)->GetLazyProperty(receiver,
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result,
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name,
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attributes);
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}
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Object* value;
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JSObject* holder = result->holder();
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switch (result->type()) {
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case NORMAL:
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value =
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holder->property_dictionary()->ValueAt(result->GetDictionaryEntry());
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ASSERT(!value->IsTheHole() || result->IsReadOnly());
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return value->IsTheHole() ? Heap::undefined_value() : value;
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case FIELD:
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value = holder->properties()->get(result->GetFieldIndex());
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ASSERT(!value->IsTheHole() || result->IsReadOnly());
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return value->IsTheHole() ? Heap::undefined_value() : value;
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case CONSTANT_FUNCTION:
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return result->GetConstantFunction();
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case CALLBACKS:
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return GetPropertyWithCallback(receiver,
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result->GetCallbackObject(),
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name,
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holder);
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case INTERCEPTOR: {
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JSObject* recvr = JSObject::cast(receiver);
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return holder->GetPropertyWithInterceptor(recvr, name, attributes);
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}
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default:
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UNREACHABLE();
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return NULL;
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}
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}
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Object* Object::GetElementWithReceiver(Object* receiver, uint32_t index) {
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// Non-JS objects do not have integer indexed properties.
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if (!IsJSObject()) return Heap::undefined_value();
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return JSObject::cast(this)->GetElementWithReceiver(JSObject::cast(receiver),
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index);
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}
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Object* Object::GetPrototype() {
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// The object is either a number, a string, a boolean, or a real JS object.
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if (IsJSObject()) return JSObject::cast(this)->map()->prototype();
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Context* context = Top::context()->global_context();
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if (IsNumber()) return context->number_function()->instance_prototype();
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if (IsString()) return context->string_function()->instance_prototype();
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if (IsBoolean()) {
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return context->boolean_function()->instance_prototype();
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} else {
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return Heap::null_value();
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}
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}
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void Object::ShortPrint() {
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HeapStringAllocator allocator;
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StringStream accumulator(&allocator);
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ShortPrint(&accumulator);
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accumulator.OutputToStdOut();
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}
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void Object::ShortPrint(StringStream* accumulator) {
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if (IsSmi()) {
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Smi::cast(this)->SmiPrint(accumulator);
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} else if (IsFailure()) {
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Failure::cast(this)->FailurePrint(accumulator);
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} else {
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HeapObject::cast(this)->HeapObjectShortPrint(accumulator);
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}
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}
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void Smi::SmiPrint() {
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PrintF("%d", value());
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}
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void Smi::SmiPrint(StringStream* accumulator) {
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accumulator->Add("%d", value());
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}
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void Failure::FailurePrint(StringStream* accumulator) {
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accumulator->Add("Failure(%d)", value());
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}
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void Failure::FailurePrint() {
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PrintF("Failure(%d)", value());
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}
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Failure* Failure::RetryAfterGC(int requested_bytes, AllocationSpace space) {
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ASSERT((space & ~kSpaceTagMask) == 0);
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int requested = requested_bytes >> kObjectAlignmentBits;
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int value = (requested << kSpaceTagSize) | space;
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// We can't very well allocate a heap number in this situation, and if the
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// requested memory is so large it seems reasonable to say that this is an
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// out of memory situation. This fixes a crash in
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// js1_5/Regress/regress-303213.js.
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if (value >> kSpaceTagSize != requested ||
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!Smi::IsValid(value) ||
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value != ((value << kFailureTypeTagSize) >> kFailureTypeTagSize) ||
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!Smi::IsValid(value << kFailureTypeTagSize)) {
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Top::context()->mark_out_of_memory();
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return Failure::OutOfMemoryException();
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}
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return Construct(RETRY_AFTER_GC, value);
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}
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// Should a word be prefixed by 'a' or 'an' in order to read naturally in
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// English? Returns false for non-ASCII or words that don't start with
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// a capital letter. The a/an rule follows pronunciation in English.
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// We don't use the BBC's overcorrect "an historic occasion" though if
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// you speak a dialect you may well say "an 'istoric occasion".
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static bool AnWord(String* str) {
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if (str->length() == 0) return false; // a nothing
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int c0 = str->Get(0);
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int c1 = str->length() > 1 ? str->Get(1) : 0;
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if (c0 == 'U') {
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if (c1 > 'Z') {
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return true; // an Umpire, but a UTF8String, a U
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}
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} else if (c0 == 'A' || c0 == 'E' || c0 == 'I' || c0 == 'O') {
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return true; // an Ape, an ABCBook
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} else if ((c1 == 0 || (c1 >= 'A' && c1 <= 'Z')) &&
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(c0 == 'F' || c0 == 'H' || c0 == 'M' || c0 == 'N' || c0 == 'R' ||
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c0 == 'S' || c0 == 'X')) {
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return true; // an MP3File, an M
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}
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return false;
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}
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Object* String::Flatten() {
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#ifdef DEBUG
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|
// Do not attempt to flatten in debug mode when allocation is not
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// allowed. This is to avoid an assertion failure when allocating.
|
|
// Flattening strings is the only case where we always allow
|
|
// allocation because no GC is performed if the allocation fails.
|
|
if (!Heap::IsAllocationAllowed()) return this;
|
|
#endif
|
|
|
|
switch (representation_tag()) {
|
|
case kSlicedStringTag: {
|
|
SlicedString* ss = SlicedString::cast(this);
|
|
// The SlicedString constructor should ensure that there are no
|
|
// SlicedStrings that are constructed directly on top of other
|
|
// SlicedStrings.
|
|
ASSERT(!ss->buffer()->IsSlicedString());
|
|
Object* ok = String::cast(ss->buffer())->Flatten();
|
|
if (ok->IsFailure()) return ok;
|
|
return this;
|
|
}
|
|
case kConsStringTag: {
|
|
ConsString* cs = ConsString::cast(this);
|
|
if (String::cast(cs->second())->length() == 0) {
|
|
return this;
|
|
}
|
|
// There's little point in putting the flat string in new space if the
|
|
// cons string is in old space. It can never get GCed until there is
|
|
// an old space GC.
|
|
PretenureFlag tenure = Heap::InNewSpace(this) ? NOT_TENURED : TENURED;
|
|
Object* object = IsAscii() ?
|
|
Heap::AllocateRawAsciiString(length(), tenure) :
|
|
Heap::AllocateRawTwoByteString(length(), tenure);
|
|
if (object->IsFailure()) return object;
|
|
String* result = String::cast(object);
|
|
Flatten(this, result, 0, length(), 0);
|
|
cs->set_first(result);
|
|
cs->set_second(Heap::empty_string());
|
|
return this;
|
|
}
|
|
default:
|
|
return this;
|
|
}
|
|
}
|
|
|
|
|
|
void String::StringShortPrint(StringStream* accumulator) {
|
|
int len = length();
|
|
if (len > kMaxMediumStringSize) {
|
|
accumulator->Add("<Very long string[%u]>", len);
|
|
return;
|
|
}
|
|
|
|
if (!LooksValid()) {
|
|
accumulator->Add("<Invalid String>");
|
|
return;
|
|
}
|
|
|
|
StringInputBuffer buf(this);
|
|
|
|
bool truncated = false;
|
|
if (len > kMaxShortPrintLength) {
|
|
len = kMaxShortPrintLength;
|
|
truncated = true;
|
|
}
|
|
bool ascii = true;
|
|
for (int i = 0; i < len; i++) {
|
|
int c = buf.GetNext();
|
|
|
|
if (c < 32 || c >= 127) {
|
|
ascii = false;
|
|
}
|
|
}
|
|
buf.Reset(this);
|
|
if (ascii) {
|
|
accumulator->Add("<String[%u]: ", length());
|
|
for (int i = 0; i < len; i++) {
|
|
accumulator->Put(buf.GetNext());
|
|
}
|
|
accumulator->Put('>');
|
|
} else {
|
|
// Backslash indicates that the string contains control
|
|
// characters and that backslashes are therefore escaped.
|
|
accumulator->Add("<String[%u]\\: ", length());
|
|
for (int i = 0; i < len; i++) {
|
|
int c = buf.GetNext();
|
|
if (c == '\n') {
|
|
accumulator->Add("\\n");
|
|
} else if (c == '\r') {
|
|
accumulator->Add("\\r");
|
|
} else if (c == '\\') {
|
|
accumulator->Add("\\\\");
|
|
} else if (c < 32 || c > 126) {
|
|
accumulator->Add("\\x%02x", c);
|
|
} else {
|
|
accumulator->Put(c);
|
|
}
|
|
}
|
|
if (truncated) {
|
|
accumulator->Put('.');
|
|
accumulator->Put('.');
|
|
accumulator->Put('.');
|
|
}
|
|
accumulator->Put('>');
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
void JSObject::JSObjectShortPrint(StringStream* accumulator) {
|
|
switch (map()->instance_type()) {
|
|
case JS_ARRAY_TYPE: {
|
|
double length = JSArray::cast(this)->length()->Number();
|
|
accumulator->Add("<JS array[%u]>", static_cast<uint32_t>(length));
|
|
break;
|
|
}
|
|
case JS_REGEXP_TYPE: {
|
|
accumulator->Add("<JS RegExp>");
|
|
break;
|
|
}
|
|
case JS_FUNCTION_TYPE: {
|
|
Object* fun_name = JSFunction::cast(this)->shared()->name();
|
|
bool printed = false;
|
|
if (fun_name->IsString()) {
|
|
String* str = String::cast(fun_name);
|
|
if (str->length() > 0) {
|
|
accumulator->Add("<JS Function ");
|
|
accumulator->Put(str);
|
|
accumulator->Put('>');
|
|
printed = true;
|
|
}
|
|
}
|
|
if (!printed) {
|
|
accumulator->Add("<JS Function>");
|
|
}
|
|
break;
|
|
}
|
|
// All other JSObjects are rather similar to each other (JSObject,
|
|
// JSGlobalObject, JSUndetectableObject, JSValue).
|
|
default: {
|
|
Object* constructor = map()->constructor();
|
|
bool printed = false;
|
|
if (constructor->IsHeapObject() &&
|
|
!Heap::Contains(HeapObject::cast(constructor))) {
|
|
accumulator->Add("!!!INVALID CONSTRUCTOR!!!");
|
|
} else {
|
|
bool global_object = IsJSGlobalObject();
|
|
if (constructor->IsJSFunction()) {
|
|
if (!Heap::Contains(JSFunction::cast(constructor)->shared())) {
|
|
accumulator->Add("!!!INVALID SHARED ON CONSTRUCTOR!!!");
|
|
} else {
|
|
Object* constructor_name =
|
|
JSFunction::cast(constructor)->shared()->name();
|
|
if (constructor_name->IsString()) {
|
|
String* str = String::cast(constructor_name);
|
|
if (str->length() > 0) {
|
|
bool vowel = AnWord(str);
|
|
accumulator->Add("<%sa%s ",
|
|
global_object ? "JS Global Object: " : "",
|
|
vowel ? "n" : "");
|
|
accumulator->Put(str);
|
|
accumulator->Put('>');
|
|
printed = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (!printed) {
|
|
accumulator->Add("<JS %sObject", global_object ? "Global " : "");
|
|
}
|
|
}
|
|
if (IsJSValue()) {
|
|
accumulator->Add(" value = ");
|
|
JSValue::cast(this)->value()->ShortPrint(accumulator);
|
|
}
|
|
accumulator->Put('>');
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void HeapObject::HeapObjectShortPrint(StringStream* accumulator) {
|
|
// if (!Heap::InNewSpace(this)) PrintF("*", this);
|
|
if (!Heap::Contains(this)) {
|
|
accumulator->Add("!!!INVALID POINTER!!!");
|
|
return;
|
|
}
|
|
if (!Heap::Contains(map())) {
|
|
accumulator->Add("!!!INVALID MAP!!!");
|
|
return;
|
|
}
|
|
|
|
accumulator->Add("%p ", this);
|
|
|
|
if (IsString()) {
|
|
String::cast(this)->StringShortPrint(accumulator);
|
|
return;
|
|
}
|
|
if (IsJSObject()) {
|
|
JSObject::cast(this)->JSObjectShortPrint(accumulator);
|
|
return;
|
|
}
|
|
switch (map()->instance_type()) {
|
|
case MAP_TYPE:
|
|
accumulator->Add("<Map>");
|
|
break;
|
|
case FIXED_ARRAY_TYPE:
|
|
accumulator->Add("<FixedArray[%u]>", FixedArray::cast(this)->length());
|
|
break;
|
|
case BYTE_ARRAY_TYPE:
|
|
accumulator->Add("<ByteArray[%u]>", ByteArray::cast(this)->length());
|
|
break;
|
|
case SHARED_FUNCTION_INFO_TYPE:
|
|
accumulator->Add("<SharedFunctionInfo>");
|
|
break;
|
|
#define MAKE_STRUCT_CASE(NAME, Name, name) \
|
|
case NAME##_TYPE: \
|
|
accumulator->Add(#Name); \
|
|
break;
|
|
STRUCT_LIST(MAKE_STRUCT_CASE)
|
|
#undef MAKE_STRUCT_CASE
|
|
case CODE_TYPE:
|
|
accumulator->Add("<Code>");
|
|
break;
|
|
case ODDBALL_TYPE: {
|
|
if (IsUndefined())
|
|
accumulator->Add("<undefined>");
|
|
else if (IsTheHole())
|
|
accumulator->Add("<the hole>");
|
|
else if (IsNull())
|
|
accumulator->Add("<null>");
|
|
else if (IsTrue())
|
|
accumulator->Add("<true>");
|
|
else if (IsFalse())
|
|
accumulator->Add("<false>");
|
|
else
|
|
accumulator->Add("<Odd Oddball>");
|
|
break;
|
|
}
|
|
case HEAP_NUMBER_TYPE:
|
|
accumulator->Add("<Number: ");
|
|
HeapNumber::cast(this)->HeapNumberPrint(accumulator);
|
|
accumulator->Put('>');
|
|
break;
|
|
case PROXY_TYPE:
|
|
accumulator->Add("<Proxy>");
|
|
break;
|
|
default:
|
|
accumulator->Add("<Other heap object (%d)>", map()->instance_type());
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
int HeapObject::SlowSizeFromMap(Map* map) {
|
|
// Avoid calling functions such as FixedArray::cast during GC, which
|
|
// read map pointer of this object again.
|
|
InstanceType instance_type = map->instance_type();
|
|
|
|
if (instance_type < FIRST_NONSTRING_TYPE
|
|
&& (reinterpret_cast<String*>(this)->map_representation_tag(map)
|
|
== kSeqStringTag)) {
|
|
if (reinterpret_cast<String*>(this)->is_ascii_map(map)) {
|
|
return reinterpret_cast<AsciiString*>(this)->AsciiStringSize(map);
|
|
} else {
|
|
return reinterpret_cast<TwoByteString*>(this)->TwoByteStringSize(map);
|
|
}
|
|
}
|
|
|
|
switch (instance_type) {
|
|
case FIXED_ARRAY_TYPE:
|
|
return reinterpret_cast<FixedArray*>(this)->FixedArraySize();
|
|
case BYTE_ARRAY_TYPE:
|
|
return reinterpret_cast<ByteArray*>(this)->ByteArraySize();
|
|
case CODE_TYPE:
|
|
return reinterpret_cast<Code*>(this)->CodeSize();
|
|
case MAP_TYPE:
|
|
return Map::kSize;
|
|
default:
|
|
return map->instance_size();
|
|
}
|
|
}
|
|
|
|
|
|
void HeapObject::Iterate(ObjectVisitor* v) {
|
|
// Handle header
|
|
IteratePointer(v, kMapOffset);
|
|
// Handle object body
|
|
Map* m = map();
|
|
IterateBody(m->instance_type(), SizeFromMap(m), v);
|
|
}
|
|
|
|
|
|
void HeapObject::IterateBody(InstanceType type, int object_size,
|
|
ObjectVisitor* v) {
|
|
// Avoiding <Type>::cast(this) because it accesses the map pointer field.
|
|
// During GC, the map pointer field is encoded.
|
|
if (type < FIRST_NONSTRING_TYPE) {
|
|
switch (type & kStringRepresentationMask) {
|
|
case kSeqStringTag:
|
|
break;
|
|
case kConsStringTag:
|
|
reinterpret_cast<ConsString*>(this)->ConsStringIterateBody(v);
|
|
break;
|
|
case kSlicedStringTag:
|
|
reinterpret_cast<SlicedString*>(this)->SlicedStringIterateBody(v);
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
|
|
switch (type) {
|
|
case FIXED_ARRAY_TYPE:
|
|
reinterpret_cast<FixedArray*>(this)->FixedArrayIterateBody(v);
|
|
break;
|
|
case JS_OBJECT_TYPE:
|
|
case JS_VALUE_TYPE:
|
|
case JS_ARRAY_TYPE:
|
|
case JS_REGEXP_TYPE:
|
|
case JS_FUNCTION_TYPE:
|
|
case JS_GLOBAL_OBJECT_TYPE:
|
|
reinterpret_cast<JSObject*>(this)->JSObjectIterateBody(object_size, v);
|
|
break;
|
|
case JS_BUILTINS_OBJECT_TYPE:
|
|
reinterpret_cast<JSObject*>(this)->JSObjectIterateBody(object_size, v);
|
|
break;
|
|
case ODDBALL_TYPE:
|
|
reinterpret_cast<Oddball*>(this)->OddballIterateBody(v);
|
|
break;
|
|
case PROXY_TYPE:
|
|
reinterpret_cast<Proxy*>(this)->ProxyIterateBody(v);
|
|
break;
|
|
case MAP_TYPE:
|
|
reinterpret_cast<Map*>(this)->MapIterateBody(v);
|
|
break;
|
|
case CODE_TYPE:
|
|
reinterpret_cast<Code*>(this)->CodeIterateBody(v);
|
|
break;
|
|
case HEAP_NUMBER_TYPE:
|
|
case FILLER_TYPE:
|
|
case BYTE_ARRAY_TYPE:
|
|
break;
|
|
case SHARED_FUNCTION_INFO_TYPE: {
|
|
SharedFunctionInfo* shared = reinterpret_cast<SharedFunctionInfo*>(this);
|
|
shared->SharedFunctionInfoIterateBody(v);
|
|
break;
|
|
}
|
|
#define MAKE_STRUCT_CASE(NAME, Name, name) \
|
|
case NAME##_TYPE:
|
|
STRUCT_LIST(MAKE_STRUCT_CASE)
|
|
#undef MAKE_STRUCT_CASE
|
|
IterateStructBody(object_size, v);
|
|
break;
|
|
default:
|
|
PrintF("Unknown type: %d\n", type);
|
|
UNREACHABLE();
|
|
}
|
|
}
|
|
|
|
|
|
void HeapObject::IterateStructBody(int object_size, ObjectVisitor* v) {
|
|
IteratePointers(v, HeapObject::kHeaderSize, object_size);
|
|
}
|
|
|
|
|
|
Object* HeapNumber::HeapNumberToBoolean() {
|
|
// NaN, +0, and -0 should return the false object
|
|
switch (fpclassify(value())) {
|
|
case FP_NAN: // fall through
|
|
case FP_ZERO: return Heap::false_value();
|
|
default: return Heap::true_value();
|
|
}
|
|
}
|
|
|
|
|
|
void HeapNumber::HeapNumberPrint() {
|
|
PrintF("%.16g", Number());
|
|
}
|
|
|
|
|
|
void HeapNumber::HeapNumberPrint(StringStream* accumulator) {
|
|
// The Windows version of vsnprintf can allocate when printing a %g string
|
|
// into a buffer that may not be big enough. We don't want random memory
|
|
// allocation when producing post-crash stack traces, so we print into a
|
|
// buffer that is plenty big enough for any floating point number, then
|
|
// print that using vsnprintf (which may truncate but never allocate if
|
|
// there is no more space in the buffer).
|
|
EmbeddedVector<char, 100> buffer;
|
|
OS::SNPrintF(buffer, "%.16g", Number());
|
|
accumulator->Add("%s", buffer.start());
|
|
}
|
|
|
|
|
|
String* JSObject::class_name() {
|
|
if (IsJSFunction()) return Heap::function_class_symbol();
|
|
// If the constructor is not present "Object" is returned.
|
|
String* result = Heap::Object_symbol();
|
|
if (map()->constructor()->IsJSFunction()) {
|
|
JSFunction* constructor = JSFunction::cast(map()->constructor());
|
|
return String::cast(constructor->shared()->instance_class_name());
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
void JSObject::JSObjectIterateBody(int object_size, ObjectVisitor* v) {
|
|
// Iterate over all fields in the body. Assumes all are Object*.
|
|
IteratePointers(v, kPropertiesOffset, object_size);
|
|
}
|
|
|
|
|
|
Object* JSObject::Copy(PretenureFlag pretenure) {
|
|
// Never used to copy functions. If functions need to be copied we
|
|
// have to be careful to clear the literals array.
|
|
ASSERT(!IsJSFunction());
|
|
|
|
// Copy the elements and properties.
|
|
Object* elem = FixedArray::cast(elements())->Copy();
|
|
if (elem->IsFailure()) return elem;
|
|
Object* prop = properties()->Copy();
|
|
if (prop->IsFailure()) return prop;
|
|
|
|
// Make the clone.
|
|
Object* clone = (pretenure == NOT_TENURED) ?
|
|
Heap::Allocate(map(), NEW_SPACE) :
|
|
Heap::Allocate(map(), OLD_POINTER_SPACE);
|
|
if (clone->IsFailure()) return clone;
|
|
JSObject::cast(clone)->CopyBody(this);
|
|
|
|
// Set the new elements and properties.
|
|
JSObject::cast(clone)->set_elements(FixedArray::cast(elem));
|
|
JSObject::cast(clone)->set_properties(FixedArray::cast(prop));
|
|
|
|
// Return the new clone.
|
|
return clone;
|
|
}
|
|
|
|
|
|
Object* JSObject::AddFastPropertyUsingMap(Map* new_map,
|
|
String* name,
|
|
Object* value) {
|
|
int index = new_map->PropertyIndexFor(name);
|
|
if (map()->unused_property_fields() > 0) {
|
|
ASSERT(index < properties()->length());
|
|
properties()->set(index, value);
|
|
} else {
|
|
ASSERT(map()->unused_property_fields() == 0);
|
|
int new_unused = new_map->unused_property_fields();
|
|
Object* values =
|
|
properties()->CopySize(properties()->length() + new_unused + 1);
|
|
if (values->IsFailure()) return values;
|
|
FixedArray::cast(values)->set(index, value);
|
|
set_properties(FixedArray::cast(values));
|
|
}
|
|
set_map(new_map);
|
|
return value;
|
|
}
|
|
|
|
|
|
Object* JSObject::AddFastProperty(String* name,
|
|
Object* value,
|
|
PropertyAttributes attributes) {
|
|
// Normalize the object if the name is not a real identifier.
|
|
StringInputBuffer buffer(name);
|
|
if (!Scanner::IsIdentifier(&buffer)) {
|
|
Object* obj = NormalizeProperties();
|
|
if (obj->IsFailure()) return obj;
|
|
return AddSlowProperty(name, value, attributes);
|
|
}
|
|
|
|
// Replace a CONSTANT_TRANSITION flag with a transition.
|
|
// Do this by removing it, and the standard code for adding a map transition
|
|
// will then run.
|
|
DescriptorArray* old_descriptors = map()->instance_descriptors();
|
|
int old_name_index = old_descriptors->Search(name);
|
|
bool constant_transition = false; // Only used in assertions.
|
|
if (old_name_index != DescriptorArray::kNotFound && CONSTANT_TRANSITION ==
|
|
PropertyDetails(old_descriptors->GetDetails(old_name_index)).type()) {
|
|
constant_transition = true;
|
|
Object* r = old_descriptors->CopyRemove(name);
|
|
if (r->IsFailure()) return r;
|
|
old_descriptors = DescriptorArray::cast(r);
|
|
old_name_index = DescriptorArray::kNotFound;
|
|
}
|
|
|
|
// Compute the new index for new field.
|
|
int index = map()->NextFreePropertyIndex();
|
|
|
|
// Allocate new instance descriptors with (name, index) added
|
|
FieldDescriptor new_field(name, index, attributes);
|
|
Object* new_descriptors =
|
|
old_descriptors->CopyInsert(&new_field, REMOVE_TRANSITIONS);
|
|
if (new_descriptors->IsFailure()) return new_descriptors;
|
|
|
|
// Only allow map transition if the object's map is NOT equal to the
|
|
// global object_function's map and there is not a transition for name.
|
|
bool allow_map_transition =
|
|
!old_descriptors->Contains(name) &&
|
|
(Top::context()->global_context()->object_function()->map() != map());
|
|
ASSERT(allow_map_transition || !constant_transition);
|
|
|
|
if (map()->unused_property_fields() > 0) {
|
|
ASSERT(index < properties()->length());
|
|
// Allocate a new map for the object.
|
|
Object* r = map()->Copy();
|
|
if (r->IsFailure()) return r;
|
|
Map* new_map = Map::cast(r);
|
|
if (allow_map_transition) {
|
|
// Allocate new instance descriptors for the old map with map transition.
|
|
MapTransitionDescriptor d(name, Map::cast(new_map), attributes);
|
|
Object* r = old_descriptors->CopyInsert(&d, KEEP_TRANSITIONS);
|
|
if (r->IsFailure()) return r;
|
|
old_descriptors = DescriptorArray::cast(r);
|
|
}
|
|
// We have now allocated all the necessary objects.
|
|
// All the changes can be applied at once, so they are atomic.
|
|
map()->set_instance_descriptors(old_descriptors);
|
|
new_map->set_instance_descriptors(DescriptorArray::cast(new_descriptors));
|
|
new_map->set_unused_property_fields(map()->unused_property_fields() - 1);
|
|
set_map(new_map);
|
|
properties()->set(index, value);
|
|
} else {
|
|
ASSERT(map()->unused_property_fields() == 0);
|
|
|
|
if (properties()->length() > kMaxFastProperties) {
|
|
Object* obj = NormalizeProperties();
|
|
if (obj->IsFailure()) return obj;
|
|
return AddSlowProperty(name, value, attributes);
|
|
}
|
|
|
|
static const int kExtraFields = 3;
|
|
// Make room for the new value
|
|
Object* values =
|
|
properties()->CopySize(properties()->length() + kExtraFields);
|
|
if (values->IsFailure()) return values;
|
|
FixedArray::cast(values)->set(index, value);
|
|
|
|
// Allocate a new map for the object.
|
|
Object* r = map()->Copy();
|
|
if (r->IsFailure()) return r;
|
|
Map* new_map = Map::cast(r);
|
|
|
|
if (allow_map_transition) {
|
|
MapTransitionDescriptor d(name, Map::cast(new_map), attributes);
|
|
// Allocate new instance descriptors for the old map with map transition.
|
|
Object* r = old_descriptors->CopyInsert(&d, KEEP_TRANSITIONS);
|
|
if (r->IsFailure()) return r;
|
|
old_descriptors = DescriptorArray::cast(r);
|
|
}
|
|
// We have now allocated all the necessary objects.
|
|
// All changes can be done at once, atomically.
|
|
map()->set_instance_descriptors(old_descriptors);
|
|
new_map->set_instance_descriptors(DescriptorArray::cast(new_descriptors));
|
|
new_map->set_unused_property_fields(kExtraFields - 1);
|
|
set_map(new_map);
|
|
set_properties(FixedArray::cast(values));
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
|
|
Object* JSObject::AddConstantFunctionProperty(String* name,
|
|
JSFunction* function,
|
|
PropertyAttributes attributes) {
|
|
// Allocate new instance descriptors with (name, function) added
|
|
ConstantFunctionDescriptor d(name, function, attributes);
|
|
Object* new_descriptors =
|
|
map()->instance_descriptors()->CopyInsert(&d, REMOVE_TRANSITIONS);
|
|
if (new_descriptors->IsFailure()) return new_descriptors;
|
|
|
|
// Allocate a new map for the object.
|
|
Object* new_map = map()->Copy();
|
|
if (new_map->IsFailure()) return new_map;
|
|
|
|
DescriptorArray* descriptors = DescriptorArray::cast(new_descriptors);
|
|
Map::cast(new_map)->set_instance_descriptors(descriptors);
|
|
Map* old_map = map();
|
|
set_map(Map::cast(new_map));
|
|
|
|
// If the old map is the global object map (from new Object()),
|
|
// then transitions are not added to it, so we are done.
|
|
if (old_map == Top::context()->global_context()->object_function()->map()) {
|
|
return function;
|
|
}
|
|
|
|
// Do not add CONSTANT_TRANSITIONS to global objects
|
|
if (IsGlobalObject()) {
|
|
return function;
|
|
}
|
|
|
|
// Add a CONSTANT_TRANSITION descriptor to the old map,
|
|
// so future assignments to this property on other objects
|
|
// of the same type will create a normal field, not a constant function.
|
|
// Don't do this for special properties, with non-trival attributes.
|
|
if (attributes != NONE) {
|
|
return function;
|
|
}
|
|
ConstTransitionDescriptor mark(name);
|
|
new_descriptors =
|
|
old_map->instance_descriptors()->CopyInsert(&mark, KEEP_TRANSITIONS);
|
|
if (new_descriptors->IsFailure()) {
|
|
return function; // We have accomplished the main goal, so return success.
|
|
}
|
|
old_map->set_instance_descriptors(DescriptorArray::cast(new_descriptors));
|
|
|
|
return function;
|
|
}
|
|
|
|
|
|
Object* JSObject::ReplaceConstantFunctionProperty(String* name,
|
|
Object* value) {
|
|
// There are two situations to handle here:
|
|
// 1: Replace a constant function with another function.
|
|
// 2: Replace a constant function with an object.
|
|
if (value->IsJSFunction()) {
|
|
JSFunction* function = JSFunction::cast(value);
|
|
|
|
Object* new_map = map()->CopyDropTransitions();
|
|
if (new_map->IsFailure()) return new_map;
|
|
set_map(Map::cast(new_map));
|
|
|
|
// Replace the function entry
|
|
int index = map()->instance_descriptors()->Search(name);
|
|
ASSERT(index != DescriptorArray::kNotFound);
|
|
map()->instance_descriptors()->ReplaceConstantFunction(index, function);
|
|
} else {
|
|
// Allocate new instance descriptors with updated property index.
|
|
int index = map()->NextFreePropertyIndex();
|
|
Object* new_descriptors =
|
|
map()->instance_descriptors()->CopyReplace(name, index, NONE);
|
|
if (new_descriptors->IsFailure()) return new_descriptors;
|
|
|
|
if (map()->unused_property_fields() > 0) {
|
|
ASSERT(index < properties()->length());
|
|
|
|
// Allocate a new map for the object.
|
|
Object* new_map = map()->Copy();
|
|
if (new_map->IsFailure()) return new_map;
|
|
|
|
Map::cast(new_map)->
|
|
set_instance_descriptors(DescriptorArray::cast(new_descriptors));
|
|
Map::cast(new_map)->
|
|
set_unused_property_fields(map()->unused_property_fields()-1);
|
|
set_map(Map::cast(new_map));
|
|
properties()->set(index, value);
|
|
} else {
|
|
ASSERT(map()->unused_property_fields() == 0);
|
|
static const int kFastNofProperties = 20;
|
|
if (properties()->length() > kFastNofProperties) {
|
|
Object* obj = NormalizeProperties();
|
|
if (obj->IsFailure()) return obj;
|
|
return SetProperty(name, value, NONE);
|
|
}
|
|
|
|
static const int kExtraFields = 5;
|
|
// Make room for the more properties.
|
|
Object* values =
|
|
properties()->CopySize(properties()->length() + kExtraFields);
|
|
if (values->IsFailure()) return values;
|
|
FixedArray::cast(values)->set(index, value);
|
|
|
|
// Allocate a new map for the object.
|
|
Object* new_map = map()->Copy();
|
|
if (new_map->IsFailure()) return new_map;
|
|
|
|
Map::cast(new_map)->
|
|
set_instance_descriptors(DescriptorArray::cast(new_descriptors));
|
|
Map::cast(new_map)->
|
|
set_unused_property_fields(kExtraFields - 1);
|
|
set_map(Map::cast(new_map));
|
|
set_properties(FixedArray::cast(values));
|
|
}
|
|
}
|
|
return value;
|
|
}
|
|
|
|
|
|
// Add property in slow mode
|
|
Object* JSObject::AddSlowProperty(String* name,
|
|
Object* value,
|
|
PropertyAttributes attributes) {
|
|
PropertyDetails details = PropertyDetails(attributes, NORMAL);
|
|
Object* result = property_dictionary()->AddStringEntry(name, value, details);
|
|
if (result->IsFailure()) return result;
|
|
if (property_dictionary() != result) {
|
|
set_properties(Dictionary::cast(result));
|
|
}
|
|
return value;
|
|
}
|
|
|
|
|
|
Object* JSObject::AddProperty(String* name,
|
|
Object* value,
|
|
PropertyAttributes attributes) {
|
|
if (HasFastProperties()) {
|
|
// Ensure the descriptor array does not get too big.
|
|
if (map()->instance_descriptors()->number_of_descriptors() <
|
|
DescriptorArray::kMaxNumberOfDescriptors) {
|
|
if (value->IsJSFunction()) {
|
|
return AddConstantFunctionProperty(name,
|
|
JSFunction::cast(value),
|
|
attributes);
|
|
} else {
|
|
return AddFastProperty(name, value, attributes);
|
|
}
|
|
} else {
|
|
// Normalize the object to prevent very large instance descriptors.
|
|
// This eliminates unwanted N^2 allocation and lookup behavior.
|
|
Object* obj = NormalizeProperties();
|
|
if (obj->IsFailure()) return obj;
|
|
}
|
|
}
|
|
return AddSlowProperty(name, value, attributes);
|
|
}
|
|
|
|
|
|
Object* JSObject::SetPropertyPostInterceptor(String* name,
|
|
Object* value,
|
|
PropertyAttributes attributes) {
|
|
// Check local property, ignore interceptor.
|
|
LookupResult result;
|
|
LocalLookupRealNamedProperty(name, &result);
|
|
if (result.IsValid()) return SetProperty(&result, name, value, attributes);
|
|
// Add real property.
|
|
return AddProperty(name, value, attributes);
|
|
}
|
|
|
|
|
|
Object* JSObject::SetPropertyWithInterceptor(String* name,
|
|
Object* value,
|
|
PropertyAttributes attributes) {
|
|
HandleScope scope;
|
|
Handle<JSObject> this_handle(this);
|
|
Handle<String> name_handle(name);
|
|
Handle<Object> value_handle(value);
|
|
Handle<InterceptorInfo> interceptor(GetNamedInterceptor());
|
|
if (!interceptor->setter()->IsUndefined()) {
|
|
Handle<Object> data_handle(interceptor->data());
|
|
LOG(ApiNamedPropertyAccess("interceptor-named-set", this, name));
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(this_handle),
|
|
v8::Utils::ToLocal(data_handle),
|
|
v8::Utils::ToLocal(this_handle));
|
|
v8::NamedPropertySetter setter =
|
|
v8::ToCData<v8::NamedPropertySetter>(interceptor->setter());
|
|
v8::Handle<v8::Value> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
Handle<Object> value_unhole(value->IsTheHole() ?
|
|
Heap::undefined_value() :
|
|
value);
|
|
result = setter(v8::Utils::ToLocal(name_handle),
|
|
v8::Utils::ToLocal(value_unhole),
|
|
info);
|
|
}
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
if (!result.IsEmpty()) return *value_handle;
|
|
}
|
|
Object* raw_result = this_handle->SetPropertyPostInterceptor(*name_handle,
|
|
*value_handle,
|
|
attributes);
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
return raw_result;
|
|
}
|
|
|
|
|
|
Object* JSObject::SetProperty(String* name,
|
|
Object* value,
|
|
PropertyAttributes attributes) {
|
|
LookupResult result;
|
|
LocalLookup(name, &result);
|
|
return SetProperty(&result, name, value, attributes);
|
|
}
|
|
|
|
|
|
Object* JSObject::SetPropertyWithCallback(Object* structure,
|
|
String* name,
|
|
Object* value,
|
|
JSObject* holder) {
|
|
HandleScope scope;
|
|
|
|
// We should never get here to initialize a const with the hole
|
|
// value since a const declaration would conflict with the setter.
|
|
ASSERT(!value->IsTheHole());
|
|
Handle<Object> value_handle(value);
|
|
|
|
// To accommodate both the old and the new api we switch on the
|
|
// data structure used to store the callbacks. Eventually proxy
|
|
// callbacks should be phased out.
|
|
if (structure->IsProxy()) {
|
|
AccessorDescriptor* callback =
|
|
reinterpret_cast<AccessorDescriptor*>(Proxy::cast(structure)->proxy());
|
|
Object* obj = (callback->setter)(this, value, callback->data);
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
if (obj->IsFailure()) return obj;
|
|
return *value_handle;
|
|
}
|
|
|
|
if (structure->IsAccessorInfo()) {
|
|
// api style callbacks
|
|
AccessorInfo* data = AccessorInfo::cast(structure);
|
|
Object* call_obj = data->setter();
|
|
v8::AccessorSetter call_fun = v8::ToCData<v8::AccessorSetter>(call_obj);
|
|
if (call_fun == NULL) return value;
|
|
Handle<JSObject> self(this);
|
|
Handle<JSObject> holder_handle(JSObject::cast(holder));
|
|
Handle<String> key(name);
|
|
Handle<Object> fun_data(data->data());
|
|
LOG(ApiNamedPropertyAccess("store", this, name));
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(self),
|
|
v8::Utils::ToLocal(fun_data),
|
|
v8::Utils::ToLocal(holder_handle));
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
call_fun(v8::Utils::ToLocal(key),
|
|
v8::Utils::ToLocal(value_handle),
|
|
info);
|
|
}
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
return *value_handle;
|
|
}
|
|
|
|
if (structure->IsFixedArray()) {
|
|
Object* setter = FixedArray::cast(structure)->get(kSetterIndex);
|
|
if (setter->IsJSFunction()) {
|
|
Handle<JSFunction> fun(JSFunction::cast(setter));
|
|
Handle<JSObject> self(this);
|
|
bool has_pending_exception;
|
|
Object** argv[] = { value_handle.location() };
|
|
Execution::Call(fun, self, 1, argv, &has_pending_exception);
|
|
// Check for pending exception and return the result.
|
|
if (has_pending_exception) return Failure::Exception();
|
|
} else {
|
|
Handle<String> key(name);
|
|
Handle<Object> holder_handle(holder);
|
|
Handle<Object> args[2] = { key, holder_handle };
|
|
return Top::Throw(*Factory::NewTypeError("no_setter_in_callback",
|
|
HandleVector(args, 2)));
|
|
}
|
|
return *value_handle;
|
|
}
|
|
|
|
UNREACHABLE();
|
|
return 0;
|
|
}
|
|
|
|
|
|
void JSObject::LookupCallbackSetterInPrototypes(String* name,
|
|
LookupResult* result) {
|
|
for (Object* pt = GetPrototype();
|
|
pt != Heap::null_value();
|
|
pt = pt->GetPrototype()) {
|
|
JSObject::cast(pt)->LocalLookupRealNamedProperty(name, result);
|
|
if (result->IsValid()) {
|
|
if (!result->IsTransitionType() && result->IsReadOnly()) {
|
|
result->NotFound();
|
|
return;
|
|
}
|
|
if (result->type() == CALLBACKS) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
result->NotFound();
|
|
}
|
|
|
|
|
|
void JSObject::LookupInDescriptor(String* name, LookupResult* result) {
|
|
DescriptorArray* descriptors = map()->instance_descriptors();
|
|
int number = descriptors->Search(name);
|
|
if (number != DescriptorArray::kNotFound) {
|
|
result->DescriptorResult(this, descriptors->GetDetails(number), number);
|
|
} else {
|
|
result->NotFound();
|
|
}
|
|
}
|
|
|
|
|
|
void JSObject::LocalLookupRealNamedProperty(String* name,
|
|
LookupResult* result) {
|
|
if (HasFastProperties()) {
|
|
LookupInDescriptor(name, result);
|
|
if (result->IsValid()) {
|
|
ASSERT(result->holder() == this && result->type() != NORMAL);
|
|
// Disallow caching for uninitialized constants. These can only
|
|
// occur as fields.
|
|
if (result->IsReadOnly() && result->type() == FIELD &&
|
|
properties()->get(result->GetFieldIndex())->IsTheHole()) {
|
|
result->DisallowCaching();
|
|
}
|
|
return;
|
|
}
|
|
} else {
|
|
int entry = property_dictionary()->FindStringEntry(name);
|
|
if (entry != DescriptorArray::kNotFound) {
|
|
// Make sure to disallow caching for uninitialized constants
|
|
// found in the dictionary-mode objects.
|
|
if (property_dictionary()->ValueAt(entry)->IsTheHole()) {
|
|
result->DisallowCaching();
|
|
}
|
|
result->DictionaryResult(this, entry);
|
|
return;
|
|
}
|
|
// Slow case object skipped during lookup. Do not use inline caching.
|
|
result->DisallowCaching();
|
|
}
|
|
result->NotFound();
|
|
}
|
|
|
|
|
|
void JSObject::LookupRealNamedProperty(String* name, LookupResult* result) {
|
|
LocalLookupRealNamedProperty(name, result);
|
|
if (result->IsProperty()) return;
|
|
|
|
LookupRealNamedPropertyInPrototypes(name, result);
|
|
}
|
|
|
|
|
|
void JSObject::LookupRealNamedPropertyInPrototypes(String* name,
|
|
LookupResult* result) {
|
|
for (Object* pt = GetPrototype();
|
|
pt != Heap::null_value();
|
|
pt = JSObject::cast(pt)->GetPrototype()) {
|
|
JSObject::cast(pt)->LocalLookupRealNamedProperty(name, result);
|
|
if (result->IsValid()) {
|
|
switch (result->type()) {
|
|
case NORMAL:
|
|
case FIELD:
|
|
case CONSTANT_FUNCTION:
|
|
case CALLBACKS:
|
|
return;
|
|
default: break;
|
|
}
|
|
}
|
|
}
|
|
result->NotFound();
|
|
}
|
|
|
|
|
|
// We only need to deal with CALLBACKS and INTERCEPTORS
|
|
Object* JSObject::SetPropertyWithFailedAccessCheck(LookupResult* result,
|
|
String* name,
|
|
Object* value) {
|
|
if (!result->IsProperty()) {
|
|
LookupCallbackSetterInPrototypes(name, result);
|
|
}
|
|
|
|
if (result->IsProperty()) {
|
|
if (!result->IsReadOnly()) {
|
|
switch (result->type()) {
|
|
case CALLBACKS: {
|
|
Object* obj = result->GetCallbackObject();
|
|
if (obj->IsAccessorInfo()) {
|
|
AccessorInfo* info = AccessorInfo::cast(obj);
|
|
if (info->all_can_write()) {
|
|
return SetPropertyWithCallback(result->GetCallbackObject(),
|
|
name,
|
|
value,
|
|
result->holder());
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case INTERCEPTOR: {
|
|
// Try lookup real named properties. Note that only property can be
|
|
// set is callbacks marked as ALL_CAN_WRITE on the prototype chain.
|
|
LookupResult r;
|
|
LookupRealNamedProperty(name, &r);
|
|
if (r.IsProperty()) {
|
|
return SetPropertyWithFailedAccessCheck(&r, name, value);
|
|
}
|
|
break;
|
|
}
|
|
default: {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_SET);
|
|
return value;
|
|
}
|
|
|
|
|
|
Object* JSObject::SetProperty(LookupResult* result,
|
|
String* name,
|
|
Object* value,
|
|
PropertyAttributes attributes) {
|
|
// Make sure that the top context does not change when doing callbacks or
|
|
// interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded()
|
|
&& !Top::MayNamedAccess(this, name, v8::ACCESS_SET)) {
|
|
return SetPropertyWithFailedAccessCheck(result, name, value);
|
|
}
|
|
if (result->IsNotFound() || !result->IsProperty()) {
|
|
// We could not find a local property so let's check whether there is an
|
|
// accessor that wants to handle the property.
|
|
LookupResult accessor_result;
|
|
LookupCallbackSetterInPrototypes(name, &accessor_result);
|
|
if (accessor_result.IsValid()) {
|
|
return SetPropertyWithCallback(accessor_result.GetCallbackObject(),
|
|
name,
|
|
value,
|
|
accessor_result.holder());
|
|
}
|
|
}
|
|
if (result->IsNotFound()) {
|
|
return AddProperty(name, value, attributes);
|
|
}
|
|
if (!result->IsLoaded()) {
|
|
return SetLazyProperty(result, name, value, attributes);
|
|
}
|
|
if (result->IsReadOnly() && result->IsProperty()) return value;
|
|
// This is a real property that is not read-only, or it is a
|
|
// transition or null descriptor and there are no setters in the prototypes.
|
|
switch (result->type()) {
|
|
case NORMAL:
|
|
property_dictionary()->ValueAtPut(result->GetDictionaryEntry(), value);
|
|
return value;
|
|
case FIELD:
|
|
properties()->set(result->GetFieldIndex(), value);
|
|
return value;
|
|
case MAP_TRANSITION:
|
|
if (attributes == result->GetAttributes()) {
|
|
// Only use map transition if the attributes match.
|
|
return AddFastPropertyUsingMap(result->GetTransitionMap(),
|
|
name,
|
|
value);
|
|
} else {
|
|
return AddFastProperty(name, value, attributes);
|
|
}
|
|
case CONSTANT_FUNCTION:
|
|
if (value == result->GetConstantFunction()) return value;
|
|
// Only replace the function if necessary.
|
|
return ReplaceConstantFunctionProperty(name, value);
|
|
case CALLBACKS:
|
|
return SetPropertyWithCallback(result->GetCallbackObject(),
|
|
name,
|
|
value,
|
|
result->holder());
|
|
case INTERCEPTOR:
|
|
return SetPropertyWithInterceptor(name, value, attributes);
|
|
case CONSTANT_TRANSITION:
|
|
// Replace with a MAP_TRANSITION to a new map with a FIELD, even
|
|
// if the value is a function.
|
|
// AddProperty has been extended to do this, in this case.
|
|
return AddFastProperty(name, value, attributes);
|
|
case NULL_DESCRIPTOR:
|
|
UNREACHABLE();
|
|
default:
|
|
UNREACHABLE();
|
|
}
|
|
UNREACHABLE();
|
|
return value;
|
|
}
|
|
|
|
|
|
// Set a real local property, even if it is READ_ONLY. If the property is not
|
|
// present, add it with attributes NONE. This code is the same as in
|
|
// SetProperty, except for the check for IsReadOnly and the check for a
|
|
// callback setter.
|
|
Object* JSObject::IgnoreAttributesAndSetLocalProperty(String* name,
|
|
Object* value) {
|
|
// Make sure that the top context does not change when doing callbacks or
|
|
// interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
|
|
LookupResult result;
|
|
LocalLookup(name, &result);
|
|
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayNamedAccess(this, name, v8::ACCESS_SET)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_SET);
|
|
return value;
|
|
}
|
|
|
|
if (result.IsValid()) {
|
|
switch (result.type()) {
|
|
case NORMAL:
|
|
property_dictionary()->ValueAtPut(result.GetDictionaryEntry(), value);
|
|
return value;
|
|
case FIELD:
|
|
properties()->set(result.GetFieldIndex(), value);
|
|
return value;
|
|
case MAP_TRANSITION:
|
|
return AddFastPropertyUsingMap(result.GetTransitionMap(), name, value);
|
|
case CONSTANT_FUNCTION:
|
|
return ReplaceConstantFunctionProperty(name, value);
|
|
case CALLBACKS:
|
|
return SetPropertyWithCallback(result.GetCallbackObject(), name, value,
|
|
result.holder());
|
|
case INTERCEPTOR:
|
|
return SetPropertyWithInterceptor(name, value, NONE);
|
|
case CONSTANT_TRANSITION:
|
|
case NULL_DESCRIPTOR:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
}
|
|
|
|
// The property was not found
|
|
return AddProperty(name, value, NONE);
|
|
}
|
|
|
|
|
|
PropertyAttributes JSObject::GetPropertyAttributePostInterceptor(
|
|
JSObject* receiver,
|
|
String* name,
|
|
bool continue_search) {
|
|
// Check local property, ignore interceptor.
|
|
LookupResult result;
|
|
LocalLookupRealNamedProperty(name, &result);
|
|
if (result.IsProperty()) return result.GetAttributes();
|
|
|
|
if (continue_search) {
|
|
// Continue searching via the prototype chain.
|
|
Object* pt = GetPrototype();
|
|
if (pt != Heap::null_value()) {
|
|
return JSObject::cast(pt)->
|
|
GetPropertyAttributeWithReceiver(receiver, name);
|
|
}
|
|
}
|
|
return ABSENT;
|
|
}
|
|
|
|
|
|
PropertyAttributes JSObject::GetPropertyAttributeWithInterceptor(
|
|
JSObject* receiver,
|
|
String* name,
|
|
bool continue_search) {
|
|
// Make sure that the top context does not change when doing
|
|
// callbacks or interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
|
|
HandleScope scope;
|
|
Handle<InterceptorInfo> interceptor(GetNamedInterceptor());
|
|
Handle<JSObject> receiver_handle(receiver);
|
|
Handle<JSObject> holder_handle(this);
|
|
Handle<String> name_handle(name);
|
|
Handle<Object> data_handle(interceptor->data());
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(receiver_handle),
|
|
v8::Utils::ToLocal(data_handle),
|
|
v8::Utils::ToLocal(holder_handle));
|
|
if (!interceptor->query()->IsUndefined()) {
|
|
v8::NamedPropertyQuery query =
|
|
v8::ToCData<v8::NamedPropertyQuery>(interceptor->query());
|
|
LOG(ApiNamedPropertyAccess("interceptor-named-has", *holder_handle, name));
|
|
v8::Handle<v8::Boolean> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = query(v8::Utils::ToLocal(name_handle), info);
|
|
}
|
|
if (!result.IsEmpty()) {
|
|
// Convert the boolean result to a property attribute
|
|
// specification.
|
|
return result->IsTrue() ? NONE : ABSENT;
|
|
}
|
|
} else if (!interceptor->getter()->IsUndefined()) {
|
|
v8::NamedPropertyGetter getter =
|
|
v8::ToCData<v8::NamedPropertyGetter>(interceptor->getter());
|
|
LOG(ApiNamedPropertyAccess("interceptor-named-get-has", this, name));
|
|
v8::Handle<v8::Value> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = getter(v8::Utils::ToLocal(name_handle), info);
|
|
}
|
|
if (!result.IsEmpty()) return NONE;
|
|
}
|
|
return holder_handle->GetPropertyAttributePostInterceptor(*receiver_handle,
|
|
*name_handle,
|
|
continue_search);
|
|
}
|
|
|
|
|
|
PropertyAttributes JSObject::GetPropertyAttributeWithReceiver(
|
|
JSObject* receiver,
|
|
String* key) {
|
|
uint32_t index = 0;
|
|
if (key->AsArrayIndex(&index)) {
|
|
if (HasElementWithReceiver(receiver, index)) return NONE;
|
|
return ABSENT;
|
|
}
|
|
// Named property.
|
|
LookupResult result;
|
|
Lookup(key, &result);
|
|
return GetPropertyAttribute(receiver, &result, key, true);
|
|
}
|
|
|
|
|
|
PropertyAttributes JSObject::GetPropertyAttribute(JSObject* receiver,
|
|
LookupResult* result,
|
|
String* name,
|
|
bool continue_search) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayNamedAccess(this, name, v8::ACCESS_HAS)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_HAS);
|
|
return ABSENT;
|
|
}
|
|
if (result->IsValid()) {
|
|
switch (result->type()) {
|
|
case NORMAL: // fall through
|
|
case FIELD:
|
|
case CONSTANT_FUNCTION:
|
|
case CALLBACKS:
|
|
return result->GetAttributes();
|
|
case INTERCEPTOR:
|
|
return result->holder()->
|
|
GetPropertyAttributeWithInterceptor(receiver, name, continue_search);
|
|
case MAP_TRANSITION:
|
|
case CONSTANT_TRANSITION:
|
|
case NULL_DESCRIPTOR:
|
|
return ABSENT;
|
|
default:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
}
|
|
return ABSENT;
|
|
}
|
|
|
|
|
|
PropertyAttributes JSObject::GetLocalPropertyAttribute(String* name) {
|
|
// Check whether the name is an array index.
|
|
uint32_t index = 0;
|
|
if (name->AsArrayIndex(&index)) {
|
|
if (HasLocalElement(index)) return NONE;
|
|
return ABSENT;
|
|
}
|
|
// Named property.
|
|
LookupResult result;
|
|
LocalLookup(name, &result);
|
|
return GetPropertyAttribute(this, &result, name, false);
|
|
}
|
|
|
|
|
|
Object* JSObject::NormalizeProperties() {
|
|
if (!HasFastProperties()) return this;
|
|
|
|
// Allocate new content
|
|
Object* obj =
|
|
Dictionary::Allocate(map()->NumberOfDescribedProperties() * 2 + 4);
|
|
if (obj->IsFailure()) return obj;
|
|
Dictionary* dictionary = Dictionary::cast(obj);
|
|
|
|
for (DescriptorReader r(map()->instance_descriptors());
|
|
!r.eos();
|
|
r.advance()) {
|
|
PropertyDetails details = r.GetDetails();
|
|
switch (details.type()) {
|
|
case CONSTANT_FUNCTION: {
|
|
PropertyDetails d =
|
|
PropertyDetails(details.attributes(), NORMAL, details.index());
|
|
Object* value = r.GetConstantFunction();
|
|
Object* result = dictionary->AddStringEntry(r.GetKey(), value, d);
|
|
if (result->IsFailure()) return result;
|
|
dictionary = Dictionary::cast(result);
|
|
break;
|
|
}
|
|
case FIELD: {
|
|
PropertyDetails d =
|
|
PropertyDetails(details.attributes(), NORMAL, details.index());
|
|
Object* value = properties()->get(r.GetFieldIndex());
|
|
Object* result = dictionary->AddStringEntry(r.GetKey(), value, d);
|
|
if (result->IsFailure()) return result;
|
|
dictionary = Dictionary::cast(result);
|
|
break;
|
|
}
|
|
case CALLBACKS: {
|
|
PropertyDetails d =
|
|
PropertyDetails(details.attributes(), CALLBACKS, details.index());
|
|
Object* value = r.GetCallbacksObject();
|
|
Object* result = dictionary->AddStringEntry(r.GetKey(), value, d);
|
|
if (result->IsFailure()) return result;
|
|
dictionary = Dictionary::cast(result);
|
|
break;
|
|
}
|
|
case MAP_TRANSITION:
|
|
case CONSTANT_TRANSITION:
|
|
case NULL_DESCRIPTOR:
|
|
case INTERCEPTOR:
|
|
break;
|
|
default:
|
|
case NORMAL:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Copy the next enumeration index from instance descriptor.
|
|
int index = map()->instance_descriptors()->NextEnumerationIndex();
|
|
dictionary->SetNextEnumerationIndex(index);
|
|
|
|
// Allocate new map.
|
|
obj = map()->Copy();
|
|
if (obj->IsFailure()) return obj;
|
|
|
|
// We have now sucessfully allocated all the necessary objects.
|
|
// Changes can now be made with the guarantee that all of them take effect.
|
|
set_map(Map::cast(obj));
|
|
map()->set_instance_descriptors(Heap::empty_descriptor_array());
|
|
|
|
map()->set_unused_property_fields(0);
|
|
set_properties(dictionary);
|
|
|
|
Counters::props_to_dictionary.Increment();
|
|
|
|
#ifdef DEBUG
|
|
if (FLAG_trace_normalization) {
|
|
PrintF("Object properties have been normalized:\n");
|
|
Print();
|
|
}
|
|
#endif
|
|
return this;
|
|
}
|
|
|
|
|
|
Object* JSObject::TransformToFastProperties(int unused_property_fields) {
|
|
if (HasFastProperties()) return this;
|
|
return property_dictionary()->
|
|
TransformPropertiesToFastFor(this, unused_property_fields);
|
|
}
|
|
|
|
|
|
Object* JSObject::NormalizeElements() {
|
|
if (!HasFastElements()) return this;
|
|
|
|
// Get number of entries.
|
|
FixedArray* array = FixedArray::cast(elements());
|
|
|
|
// Compute the effective length.
|
|
int length = IsJSArray() ?
|
|
Smi::cast(JSArray::cast(this)->length())->value() :
|
|
array->length();
|
|
Object* obj = Dictionary::Allocate(length);
|
|
if (obj->IsFailure()) return obj;
|
|
Dictionary* dictionary = Dictionary::cast(obj);
|
|
// Copy entries.
|
|
for (int i = 0; i < length; i++) {
|
|
Object* value = array->get(i);
|
|
if (!value->IsTheHole()) {
|
|
PropertyDetails details = PropertyDetails(NONE, NORMAL);
|
|
Object* result = dictionary->AddNumberEntry(i, array->get(i), details);
|
|
if (result->IsFailure()) return result;
|
|
dictionary = Dictionary::cast(result);
|
|
}
|
|
}
|
|
// Switch to using the dictionary as the backing storage for elements.
|
|
set_elements(dictionary);
|
|
|
|
Counters::elements_to_dictionary.Increment();
|
|
|
|
#ifdef DEBUG
|
|
if (FLAG_trace_normalization) {
|
|
PrintF("Object elements have been normalized:\n");
|
|
Print();
|
|
}
|
|
#endif
|
|
|
|
return this;
|
|
}
|
|
|
|
|
|
Object* JSObject::DeletePropertyPostInterceptor(String* name) {
|
|
// Check local property, ignore interceptor.
|
|
LookupResult result;
|
|
LocalLookupRealNamedProperty(name, &result);
|
|
if (!result.IsValid()) return Heap::true_value();
|
|
|
|
// Normalize object if needed.
|
|
Object* obj = NormalizeProperties();
|
|
if (obj->IsFailure()) return obj;
|
|
|
|
ASSERT(!HasFastProperties());
|
|
// Attempt to remove the property from the property dictionary.
|
|
Dictionary* dictionary = property_dictionary();
|
|
int entry = dictionary->FindStringEntry(name);
|
|
if (entry != -1) return dictionary->DeleteProperty(entry);
|
|
return Heap::true_value();
|
|
}
|
|
|
|
|
|
Object* JSObject::DeletePropertyWithInterceptor(String* name) {
|
|
HandleScope scope;
|
|
Handle<InterceptorInfo> interceptor(GetNamedInterceptor());
|
|
Handle<String> name_handle(name);
|
|
Handle<JSObject> this_handle(this);
|
|
if (!interceptor->deleter()->IsUndefined()) {
|
|
v8::NamedPropertyDeleter deleter =
|
|
v8::ToCData<v8::NamedPropertyDeleter>(interceptor->deleter());
|
|
Handle<Object> data_handle(interceptor->data());
|
|
LOG(ApiNamedPropertyAccess("interceptor-named-delete", *this_handle, name));
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(this_handle),
|
|
v8::Utils::ToLocal(data_handle),
|
|
v8::Utils::ToLocal(this_handle));
|
|
v8::Handle<v8::Boolean> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = deleter(v8::Utils::ToLocal(name_handle), info);
|
|
}
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
if (!result.IsEmpty()) {
|
|
ASSERT(result->IsBoolean());
|
|
return *v8::Utils::OpenHandle(*result);
|
|
}
|
|
}
|
|
Object* raw_result = this_handle->DeletePropertyPostInterceptor(*name_handle);
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
return raw_result;
|
|
}
|
|
|
|
|
|
Object* JSObject::DeleteElementPostInterceptor(uint32_t index) {
|
|
if (HasFastElements()) {
|
|
uint32_t length = IsJSArray() ?
|
|
static_cast<uint32_t>(Smi::cast(JSArray::cast(this)->length())->value()) :
|
|
static_cast<uint32_t>(FixedArray::cast(elements())->length());
|
|
if (index < length) {
|
|
FixedArray::cast(elements())->set_the_hole(index);
|
|
}
|
|
return Heap::true_value();
|
|
}
|
|
ASSERT(!HasFastElements());
|
|
Dictionary* dictionary = element_dictionary();
|
|
int entry = dictionary->FindNumberEntry(index);
|
|
if (entry != -1) return dictionary->DeleteProperty(entry);
|
|
return Heap::true_value();
|
|
}
|
|
|
|
|
|
Object* JSObject::DeleteElementWithInterceptor(uint32_t index) {
|
|
// Make sure that the top context does not change when doing
|
|
// callbacks or interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
HandleScope scope;
|
|
Handle<InterceptorInfo> interceptor(GetIndexedInterceptor());
|
|
if (interceptor->deleter()->IsUndefined()) return Heap::false_value();
|
|
v8::IndexedPropertyDeleter deleter =
|
|
v8::ToCData<v8::IndexedPropertyDeleter>(interceptor->deleter());
|
|
Handle<JSObject> this_handle(this);
|
|
Handle<Object> data_handle(interceptor->data());
|
|
LOG(ApiIndexedPropertyAccess("interceptor-indexed-delete", this, index));
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(this_handle),
|
|
v8::Utils::ToLocal(data_handle),
|
|
v8::Utils::ToLocal(this_handle));
|
|
v8::Handle<v8::Boolean> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = deleter(index, info);
|
|
}
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
if (!result.IsEmpty()) {
|
|
ASSERT(result->IsBoolean());
|
|
return *v8::Utils::OpenHandle(*result);
|
|
}
|
|
Object* raw_result = this_handle->DeleteElementPostInterceptor(index);
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
return raw_result;
|
|
}
|
|
|
|
|
|
Object* JSObject::DeleteElement(uint32_t index) {
|
|
if (HasIndexedInterceptor()) {
|
|
return DeleteElementWithInterceptor(index);
|
|
}
|
|
|
|
if (HasFastElements()) {
|
|
uint32_t length = IsJSArray() ?
|
|
static_cast<uint32_t>(Smi::cast(JSArray::cast(this)->length())->value()) :
|
|
static_cast<uint32_t>(FixedArray::cast(elements())->length());
|
|
if (index < length) {
|
|
FixedArray::cast(elements())->set_the_hole(index);
|
|
}
|
|
return Heap::true_value();
|
|
} else {
|
|
Dictionary* dictionary = element_dictionary();
|
|
int entry = dictionary->FindNumberEntry(index);
|
|
if (entry != -1) return dictionary->DeleteProperty(entry);
|
|
}
|
|
return Heap::true_value();
|
|
}
|
|
|
|
|
|
Object* JSObject::DeleteProperty(String* name) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayNamedAccess(this, name, v8::ACCESS_DELETE)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_DELETE);
|
|
return Heap::false_value();
|
|
}
|
|
|
|
// ECMA-262, 3rd, 8.6.2.5
|
|
ASSERT(name->IsString());
|
|
|
|
uint32_t index = 0;
|
|
if (name->AsArrayIndex(&index)) {
|
|
return DeleteElement(index);
|
|
} else {
|
|
LookupResult result;
|
|
LocalLookup(name, &result);
|
|
if (!result.IsValid()) return Heap::true_value();
|
|
if (result.IsDontDelete()) return Heap::false_value();
|
|
// Check for interceptor.
|
|
if (result.type() == INTERCEPTOR) {
|
|
return DeletePropertyWithInterceptor(name);
|
|
}
|
|
if (!result.IsLoaded()) {
|
|
return JSObject::cast(this)->DeleteLazyProperty(&result, name);
|
|
}
|
|
// Normalize object if needed.
|
|
Object* obj = NormalizeProperties();
|
|
if (obj->IsFailure()) return obj;
|
|
// Make sure the properties are normalized before removing the entry.
|
|
Dictionary* dictionary = property_dictionary();
|
|
int entry = dictionary->FindStringEntry(name);
|
|
if (entry != -1) return dictionary->DeleteProperty(entry);
|
|
return Heap::true_value();
|
|
}
|
|
}
|
|
|
|
|
|
// Check whether this object references another object.
|
|
bool JSObject::ReferencesObject(Object* obj) {
|
|
AssertNoAllocation no_alloc;
|
|
|
|
// Is the object the constructor for this object?
|
|
if (map()->constructor() == obj) {
|
|
return true;
|
|
}
|
|
|
|
// Is the object the prototype for this object?
|
|
if (map()->prototype() == obj) {
|
|
return true;
|
|
}
|
|
|
|
// Check if the object is among the named properties.
|
|
Object* key = SlowReverseLookup(obj);
|
|
if (key != Heap::undefined_value()) {
|
|
return true;
|
|
}
|
|
|
|
// Check if the object is among the indexed properties.
|
|
if (HasFastElements()) {
|
|
int length = IsJSArray()
|
|
? Smi::cast(JSArray::cast(this)->length())->value()
|
|
: FixedArray::cast(elements())->length();
|
|
for (int i = 0; i < length; i++) {
|
|
Object* element = FixedArray::cast(elements())->get(i);
|
|
if (!element->IsTheHole() && element == obj) {
|
|
return true;
|
|
}
|
|
}
|
|
} else {
|
|
key = element_dictionary()->SlowReverseLookup(obj);
|
|
if (key != Heap::undefined_value()) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// For functions check the context. Boilerplate functions do
|
|
// not have to be traversed since they have no real context.
|
|
if (IsJSFunction() && !JSFunction::cast(this)->IsBoilerplate()) {
|
|
// Get the constructor function for arguments array.
|
|
JSObject* arguments_boilerplate =
|
|
Top::context()->global_context()->arguments_boilerplate();
|
|
JSFunction* arguments_function =
|
|
JSFunction::cast(arguments_boilerplate->map()->constructor());
|
|
|
|
// Get the context and don't check if it is the global context.
|
|
JSFunction* f = JSFunction::cast(this);
|
|
Context* context = f->context();
|
|
if (context->IsGlobalContext()) {
|
|
return false;
|
|
}
|
|
|
|
// Check the non-special context slots.
|
|
for (int i = Context::MIN_CONTEXT_SLOTS; i < context->length(); i++) {
|
|
// Only check JS objects.
|
|
if (context->get(i)->IsJSObject()) {
|
|
JSObject* ctxobj = JSObject::cast(context->get(i));
|
|
// If it is an arguments array check the content.
|
|
if (ctxobj->map()->constructor() == arguments_function) {
|
|
if (ctxobj->ReferencesObject(obj)) {
|
|
return true;
|
|
}
|
|
} else if (ctxobj == obj) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check the context extension if any.
|
|
if (context->extension() != NULL) {
|
|
return context->extension()->ReferencesObject(obj);
|
|
}
|
|
}
|
|
|
|
// No references to object.
|
|
return false;
|
|
}
|
|
|
|
|
|
// Tests for the fast common case for property enumeration:
|
|
// - this object has an enum cache
|
|
// - this object has no elements
|
|
// - no prototype has enumerable properties/elements
|
|
// - neither this object nor any prototype has interceptors
|
|
bool JSObject::IsSimpleEnum() {
|
|
JSObject* arguments_boilerplate =
|
|
Top::context()->global_context()->arguments_boilerplate();
|
|
JSFunction* arguments_function =
|
|
JSFunction::cast(arguments_boilerplate->map()->constructor());
|
|
if (IsAccessCheckNeeded()) return false;
|
|
if (map()->constructor() == arguments_function) return false;
|
|
|
|
for (Object* o = this;
|
|
o != Heap::null_value();
|
|
o = JSObject::cast(o)->GetPrototype()) {
|
|
JSObject* curr = JSObject::cast(o);
|
|
if (!curr->HasFastProperties()) return false;
|
|
if (!curr->map()->instance_descriptors()->HasEnumCache()) return false;
|
|
if (curr->NumberOfEnumElements() > 0) return false;
|
|
if (curr->HasNamedInterceptor()) return false;
|
|
if (curr->HasIndexedInterceptor()) return false;
|
|
if (curr != this) {
|
|
FixedArray* curr_fixed_array =
|
|
FixedArray::cast(curr->map()->instance_descriptors()->GetEnumCache());
|
|
if (curr_fixed_array->length() > 0) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
int Map::NumberOfDescribedProperties() {
|
|
int result = 0;
|
|
for (DescriptorReader r(instance_descriptors()); !r.eos(); r.advance()) {
|
|
if (!r.IsTransition()) result++;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
int Map::PropertyIndexFor(String* name) {
|
|
for (DescriptorReader r(instance_descriptors()); !r.eos(); r.advance()) {
|
|
if (r.Equals(name)) return r.GetFieldIndex();
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
int Map::NextFreePropertyIndex() {
|
|
int index = -1;
|
|
for (DescriptorReader r(instance_descriptors()); !r.eos(); r.advance()) {
|
|
if (r.type() == FIELD) {
|
|
if (r.GetFieldIndex() > index) index = r.GetFieldIndex();
|
|
}
|
|
}
|
|
return index+1;
|
|
}
|
|
|
|
|
|
AccessorDescriptor* Map::FindAccessor(String* name) {
|
|
for (DescriptorReader r(instance_descriptors()); !r.eos(); r.advance()) {
|
|
if (r.Equals(name) && r.type() == CALLBACKS) return r.GetCallbacks();
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
void JSObject::LocalLookup(String* name, LookupResult* result) {
|
|
ASSERT(name->IsString());
|
|
|
|
// Do not use inline caching if the object is a non-global object
|
|
// that requires access checks.
|
|
if (!IsJSGlobalObject() && IsAccessCheckNeeded()) {
|
|
result->DisallowCaching();
|
|
}
|
|
|
|
// Check __proto__ before interceptor.
|
|
if (name->Equals(Heap::Proto_symbol())) {
|
|
result->ConstantResult(this);
|
|
return;
|
|
}
|
|
|
|
// Check for lookup interceptor except when bootstrapping.
|
|
if (HasNamedInterceptor() && !Bootstrapper::IsActive()) {
|
|
result->InterceptorResult(this);
|
|
return;
|
|
}
|
|
|
|
LocalLookupRealNamedProperty(name, result);
|
|
}
|
|
|
|
|
|
void JSObject::Lookup(String* name, LookupResult* result) {
|
|
// Ecma-262 3rd 8.6.2.4
|
|
for (Object* current = this;
|
|
current != Heap::null_value();
|
|
current = JSObject::cast(current)->GetPrototype()) {
|
|
JSObject::cast(current)->LocalLookup(name, result);
|
|
if (result->IsValid() && !result->IsTransitionType()) {
|
|
return;
|
|
}
|
|
}
|
|
result->NotFound();
|
|
}
|
|
|
|
|
|
Object* JSObject::DefineGetterSetter(String* name,
|
|
PropertyAttributes attributes) {
|
|
// Make sure that the top context does not change when doing callbacks or
|
|
// interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayNamedAccess(this, name, v8::ACCESS_SET)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_SET);
|
|
return Heap::undefined_value();
|
|
}
|
|
|
|
// TryFlatten before operating on the string.
|
|
name->TryFlatten();
|
|
|
|
// Make sure name is not an index.
|
|
uint32_t index;
|
|
if (name->AsArrayIndex(&index)) return Heap::undefined_value();
|
|
|
|
// Lookup the name.
|
|
LookupResult result;
|
|
LocalLookup(name, &result);
|
|
if (result.IsValid()) {
|
|
if (result.IsReadOnly()) return Heap::undefined_value();
|
|
if (result.type() == CALLBACKS) {
|
|
Object* obj = result.GetCallbackObject();
|
|
if (obj->IsFixedArray()) return obj;
|
|
}
|
|
}
|
|
|
|
// Normalize object to make this operation simple.
|
|
Object* ok = NormalizeProperties();
|
|
if (ok->IsFailure()) return ok;
|
|
|
|
// Allocate the fixed array to hold getter and setter.
|
|
Object* array = Heap::AllocateFixedArray(2);
|
|
if (array->IsFailure()) return array;
|
|
|
|
// Update the dictionary with the new CALLBACKS property.
|
|
PropertyDetails details = PropertyDetails(attributes, CALLBACKS);
|
|
Object* dict =
|
|
property_dictionary()->SetOrAddStringEntry(name, array, details);
|
|
if (dict->IsFailure()) return dict;
|
|
|
|
// Set the potential new dictionary on the object.
|
|
set_properties(Dictionary::cast(dict));
|
|
return array;
|
|
}
|
|
|
|
|
|
Object* JSObject::DefineAccessor(String* name, bool is_getter, JSFunction* fun,
|
|
PropertyAttributes attributes) {
|
|
Object* array = DefineGetterSetter(name, attributes);
|
|
if (array->IsFailure() || array->IsUndefined()) return array;
|
|
FixedArray::cast(array)->set(is_getter ? 0 : 1, fun);
|
|
return this;
|
|
}
|
|
|
|
|
|
Object* JSObject::LookupAccessor(String* name, bool is_getter) {
|
|
// Make sure that the top context does not change when doing callbacks or
|
|
// interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayNamedAccess(this, name, v8::ACCESS_HAS)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_HAS);
|
|
return Heap::undefined_value();
|
|
}
|
|
|
|
// Make sure name is not an index.
|
|
uint32_t index;
|
|
if (name->AsArrayIndex(&index)) return Heap::undefined_value();
|
|
|
|
// Make the lookup and include prototypes.
|
|
for (Object* obj = this;
|
|
obj != Heap::null_value();
|
|
obj = JSObject::cast(obj)->GetPrototype()) {
|
|
LookupResult result;
|
|
JSObject::cast(obj)->LocalLookup(name, &result);
|
|
if (result.IsValid()) {
|
|
if (result.IsReadOnly()) return Heap::undefined_value();
|
|
if (result.type() == CALLBACKS) {
|
|
Object* obj = result.GetCallbackObject();
|
|
if (obj->IsFixedArray()) {
|
|
return FixedArray::cast(obj)->get(is_getter
|
|
? kGetterIndex
|
|
: kSetterIndex);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return Heap::undefined_value();
|
|
}
|
|
|
|
|
|
Object* JSObject::SlowReverseLookup(Object* value) {
|
|
if (HasFastProperties()) {
|
|
for (DescriptorReader r(map()->instance_descriptors());
|
|
!r.eos();
|
|
r.advance()) {
|
|
if (r.type() == FIELD) {
|
|
if (properties()->get(r.GetFieldIndex()) == value) {
|
|
return r.GetKey();
|
|
}
|
|
} else if (r.type() == CONSTANT_FUNCTION) {
|
|
if (r.GetConstantFunction() == value) {
|
|
return r.GetKey();
|
|
}
|
|
}
|
|
}
|
|
return Heap::undefined_value();
|
|
} else {
|
|
return property_dictionary()->SlowReverseLookup(value);
|
|
}
|
|
}
|
|
|
|
|
|
Object* Map::Copy() {
|
|
Object* result = Heap::AllocateMap(instance_type(), instance_size());
|
|
if (result->IsFailure()) return result;
|
|
Map::cast(result)->set_prototype(prototype());
|
|
Map::cast(result)->set_constructor(constructor());
|
|
// Don't copy descriptors, so map transitions always remain a forest.
|
|
Map::cast(result)->set_instance_descriptors(Heap::empty_descriptor_array());
|
|
// Please note instance_type and instance_size are set when allocated.
|
|
Map::cast(result)->set_unused_property_fields(unused_property_fields());
|
|
Map::cast(result)->set_bit_field(bit_field());
|
|
Map::cast(result)->ClearCodeCache();
|
|
return result;
|
|
}
|
|
|
|
|
|
Object* Map::CopyDropTransitions() {
|
|
Object *new_map = Copy();
|
|
if (new_map->IsFailure()) return new_map;
|
|
Object* descriptors = instance_descriptors()->RemoveTransitions();
|
|
if (descriptors->IsFailure()) return descriptors;
|
|
cast(new_map)->set_instance_descriptors(DescriptorArray::cast(descriptors));
|
|
return cast(new_map);
|
|
}
|
|
|
|
|
|
Object* Map::UpdateCodeCache(String* name, Code* code) {
|
|
ASSERT(code->ic_state() == MONOMORPHIC);
|
|
FixedArray* cache = code_cache();
|
|
|
|
// When updating the code cache we disregard the type encoded in the
|
|
// flags. This allows call constant stubs to overwrite call field
|
|
// stubs, etc.
|
|
Code::Flags flags = Code::RemoveTypeFromFlags(code->flags());
|
|
|
|
// First check whether we can update existing code cache without
|
|
// extending it.
|
|
int length = cache->length();
|
|
int deleted_index = -1;
|
|
for (int i = 0; i < length; i += 2) {
|
|
Object* key = cache->get(i);
|
|
if (key->IsNull()) {
|
|
if (deleted_index < 0) deleted_index = i;
|
|
continue;
|
|
}
|
|
if (key->IsUndefined()) {
|
|
if (deleted_index >= 0) i = deleted_index;
|
|
cache->set(i + 0, name);
|
|
cache->set(i + 1, code);
|
|
return this;
|
|
}
|
|
if (name->Equals(String::cast(key))) {
|
|
Code::Flags found = Code::cast(cache->get(i + 1))->flags();
|
|
if (Code::RemoveTypeFromFlags(found) == flags) {
|
|
cache->set(i + 1, code);
|
|
return this;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Reached the end of the code cache. If there were deleted
|
|
// elements, reuse the space for the first of them.
|
|
if (deleted_index >= 0) {
|
|
cache->set(deleted_index + 0, name);
|
|
cache->set(deleted_index + 1, code);
|
|
return this;
|
|
}
|
|
|
|
// Extend the code cache with some new entries (at least one).
|
|
int new_length = length + ((length >> 1) & ~1) + 2;
|
|
ASSERT((new_length & 1) == 0); // must be a multiple of two
|
|
Object* result = cache->CopySize(new_length);
|
|
if (result->IsFailure()) return result;
|
|
|
|
// Add the (name, code) pair to the new cache.
|
|
cache = FixedArray::cast(result);
|
|
cache->set(length + 0, name);
|
|
cache->set(length + 1, code);
|
|
set_code_cache(cache);
|
|
return this;
|
|
}
|
|
|
|
|
|
Object* Map::FindInCodeCache(String* name, Code::Flags flags) {
|
|
FixedArray* cache = code_cache();
|
|
int length = cache->length();
|
|
for (int i = 0; i < length; i += 2) {
|
|
Object* key = cache->get(i);
|
|
// Skip deleted elements.
|
|
if (key->IsNull()) continue;
|
|
if (key->IsUndefined()) return key;
|
|
if (name->Equals(String::cast(key))) {
|
|
Code* code = Code::cast(cache->get(i + 1));
|
|
if (code->flags() == flags) return code;
|
|
}
|
|
}
|
|
return Heap::undefined_value();
|
|
}
|
|
|
|
|
|
int Map::IndexInCodeCache(Code* code) {
|
|
FixedArray* array = code_cache();
|
|
int len = array->length();
|
|
for (int i = 0; i < len; i += 2) {
|
|
if (array->get(i + 1) == code) return i + 1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
void Map::RemoveFromCodeCache(int index) {
|
|
FixedArray* array = code_cache();
|
|
ASSERT(array->length() >= index && array->get(index)->IsCode());
|
|
// Use null instead of undefined for deleted elements to distinguish
|
|
// deleted elements from unused elements. This distinction is used
|
|
// when looking up in the cache and when updating the cache.
|
|
array->set_null(index - 1); // key
|
|
array->set_null(index); // code
|
|
}
|
|
|
|
|
|
void FixedArray::FixedArrayIterateBody(ObjectVisitor* v) {
|
|
IteratePointers(v, kHeaderSize, kHeaderSize + length() * kPointerSize);
|
|
}
|
|
|
|
|
|
static bool HasKey(FixedArray* array, Object* key) {
|
|
int len0 = array->length();
|
|
for (int i = 0; i < len0; i++) {
|
|
Object* element = array->get(i);
|
|
if (element->IsSmi() && key->IsSmi() && (element == key)) return true;
|
|
if (element->IsString() &&
|
|
key->IsString() && String::cast(element)->Equals(String::cast(key))) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
Object* FixedArray::AddKeysFromJSArray(JSArray* array) {
|
|
// Remove array holes from array if any.
|
|
Object* object = array->RemoveHoles();
|
|
if (object->IsFailure()) return object;
|
|
JSArray* compacted_array = JSArray::cast(object);
|
|
|
|
// Allocate a temporary fixed array.
|
|
int compacted_array_length = Smi::cast(compacted_array->length())->value();
|
|
object = Heap::AllocateFixedArray(compacted_array_length);
|
|
if (object->IsFailure()) return object;
|
|
FixedArray* key_array = FixedArray::cast(object);
|
|
|
|
// Copy the elements from the JSArray to the temporary fixed array.
|
|
for (int i = 0; i < compacted_array_length; i++) {
|
|
key_array->set(i, compacted_array->GetElement(i));
|
|
}
|
|
|
|
// Compute the union of this and the temporary fixed array.
|
|
return UnionOfKeys(key_array);
|
|
}
|
|
|
|
|
|
Object* FixedArray::UnionOfKeys(FixedArray* other) {
|
|
int len0 = length();
|
|
int len1 = other->length();
|
|
// Optimize if either is empty.
|
|
if (len0 == 0) return other;
|
|
if (len1 == 0) return this;
|
|
|
|
// Compute how many elements are not in this.
|
|
int extra = 0;
|
|
for (int y = 0; y < len1; y++) {
|
|
if (!HasKey(this, other->get(y))) extra++;
|
|
}
|
|
|
|
// Allocate the result
|
|
Object* obj = Heap::AllocateFixedArray(len0 + extra);
|
|
if (obj->IsFailure()) return obj;
|
|
// Fill in the content
|
|
FixedArray* result = FixedArray::cast(obj);
|
|
for (int i = 0; i < len0; i++) {
|
|
result->set(i, get(i));
|
|
}
|
|
// Fill in the extra keys.
|
|
int index = 0;
|
|
for (int y = 0; y < len1; y++) {
|
|
if (!HasKey(this, other->get(y))) {
|
|
result->set(len0 + index, other->get(y));
|
|
index++;
|
|
}
|
|
}
|
|
ASSERT(extra == index);
|
|
return result;
|
|
}
|
|
|
|
|
|
Object* FixedArray::Copy() {
|
|
int len = length();
|
|
if (len == 0) return this;
|
|
Object* obj = Heap::AllocateFixedArray(len);
|
|
if (obj->IsFailure()) return obj;
|
|
FixedArray* result = FixedArray::cast(obj);
|
|
WriteBarrierMode mode = result->GetWriteBarrierMode();
|
|
// Copy the content
|
|
for (int i = 0; i < len; i++) {
|
|
result->set(i, get(i), mode);
|
|
}
|
|
result->set_map(map());
|
|
return result;
|
|
}
|
|
|
|
Object* FixedArray::CopySize(int new_length) {
|
|
if (new_length == 0) return Heap::empty_fixed_array();
|
|
Object* obj = Heap::AllocateFixedArray(new_length);
|
|
if (obj->IsFailure()) return obj;
|
|
FixedArray* result = FixedArray::cast(obj);
|
|
WriteBarrierMode mode = result->GetWriteBarrierMode();
|
|
// Copy the content
|
|
int len = length();
|
|
if (new_length < len) len = new_length;
|
|
for (int i = 0; i < len; i++) {
|
|
result->set(i, get(i), mode);
|
|
}
|
|
result->set_map(map());
|
|
return result;
|
|
}
|
|
|
|
|
|
void FixedArray::CopyTo(int pos, FixedArray* dest, int dest_pos, int len) {
|
|
WriteBarrierMode mode = dest->GetWriteBarrierMode();
|
|
for (int index = 0; index < len; index++) {
|
|
dest->set(dest_pos+index, get(pos+index), mode);
|
|
}
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
bool FixedArray::IsEqualTo(FixedArray* other) {
|
|
if (length() != other->length()) return false;
|
|
for (int i = 0 ; i < length(); ++i) {
|
|
if (get(i) != other->get(i)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
|
|
Object* DescriptorArray::Allocate(int number_of_descriptors) {
|
|
if (number_of_descriptors == 0) {
|
|
return Heap::empty_descriptor_array();
|
|
}
|
|
// Allocate the array of keys.
|
|
Object* array = Heap::AllocateFixedArray(ToKeyIndex(number_of_descriptors));
|
|
if (array->IsFailure()) return array;
|
|
// Do not use DescriptorArray::cast on incomplete object.
|
|
FixedArray* result = FixedArray::cast(array);
|
|
|
|
// Allocate the content array and set it in the descriptor array.
|
|
array = Heap::AllocateFixedArray(number_of_descriptors << 1);
|
|
if (array->IsFailure()) return array;
|
|
result->set(kContentArrayIndex, array);
|
|
result->set(kEnumerationIndexIndex,
|
|
Smi::FromInt(PropertyDetails::kInitialIndex));
|
|
return result;
|
|
}
|
|
|
|
|
|
void DescriptorArray::SetEnumCache(FixedArray* bridge_storage,
|
|
FixedArray* new_cache) {
|
|
ASSERT(bridge_storage->length() >= kEnumCacheBridgeLength);
|
|
if (HasEnumCache()) {
|
|
FixedArray::cast(get(kEnumerationIndexIndex))->
|
|
set(kEnumCacheBridgeCacheIndex, new_cache);
|
|
} else {
|
|
if (IsEmpty()) return; // Do nothing for empty descriptor array.
|
|
FixedArray::cast(bridge_storage)->
|
|
set(kEnumCacheBridgeCacheIndex, new_cache);
|
|
fast_set(FixedArray::cast(bridge_storage),
|
|
kEnumCacheBridgeEnumIndex,
|
|
get(kEnumerationIndexIndex));
|
|
set(kEnumerationIndexIndex, bridge_storage);
|
|
}
|
|
}
|
|
|
|
|
|
void DescriptorArray::ReplaceConstantFunction(int descriptor_number,
|
|
JSFunction* value) {
|
|
ASSERT(!Heap::InNewSpace(value));
|
|
FixedArray* content_array = GetContentArray();
|
|
fast_set(content_array, ToValueIndex(descriptor_number), value);
|
|
}
|
|
|
|
|
|
Object* DescriptorArray::CopyInsert(Descriptor* descriptor,
|
|
TransitionFlag transition_flag) {
|
|
// Transitions are only kept when inserting another transition.
|
|
// This precondition is not required by this function's implementation, but
|
|
// is currently required by the semantics of maps, so we check it.
|
|
// Conversely, we filter after replacing, so replacing a transition and
|
|
// removing all other transitions is not supported.
|
|
bool remove_transitions = transition_flag == REMOVE_TRANSITIONS;
|
|
ASSERT(remove_transitions == !descriptor->GetDetails().IsTransition());
|
|
ASSERT(descriptor->GetDetails().type() != NULL_DESCRIPTOR);
|
|
|
|
// Ensure the key is a symbol.
|
|
Object* result = descriptor->KeyToSymbol();
|
|
if (result->IsFailure()) return result;
|
|
|
|
int transitions = 0;
|
|
int null_descriptors = 0;
|
|
if (remove_transitions) {
|
|
for (DescriptorReader r(this); !r.eos(); r.advance()) {
|
|
if (r.IsTransition()) transitions++;
|
|
if (r.IsNullDescriptor()) null_descriptors++;
|
|
}
|
|
} else {
|
|
for (DescriptorReader r(this); !r.eos(); r.advance()) {
|
|
if (r.IsNullDescriptor()) null_descriptors++;
|
|
}
|
|
}
|
|
int new_size = number_of_descriptors() - transitions - null_descriptors;
|
|
|
|
// If key is in descriptor, we replace it in-place when filtering.
|
|
int index = Search(descriptor->GetKey());
|
|
const bool inserting = (index == kNotFound);
|
|
const bool replacing = !inserting;
|
|
bool keep_enumeration_index = false;
|
|
if (inserting) {
|
|
++new_size;
|
|
}
|
|
if (replacing) {
|
|
// We are replacing an existing descriptor. We keep the enumeration
|
|
// index of a visible property.
|
|
PropertyType t = PropertyDetails(GetDetails(index)).type();
|
|
if (t == CONSTANT_FUNCTION ||
|
|
t == FIELD ||
|
|
t == CALLBACKS ||
|
|
t == INTERCEPTOR) {
|
|
keep_enumeration_index = true;
|
|
} else if (t == NULL_DESCRIPTOR || remove_transitions) {
|
|
// Replaced descriptor has been counted as removed if it is null
|
|
// or a transition that will be replaced. Adjust count in this case.
|
|
++new_size;
|
|
}
|
|
}
|
|
result = Allocate(new_size);
|
|
if (result->IsFailure()) return result;
|
|
DescriptorArray* new_descriptors = DescriptorArray::cast(result);
|
|
// Set the enumeration index in the descriptors and set the enumeration index
|
|
// in the result.
|
|
int enumeration_index = NextEnumerationIndex();
|
|
if (!descriptor->GetDetails().IsTransition()) {
|
|
if (keep_enumeration_index) {
|
|
descriptor->SetEnumerationIndex(
|
|
PropertyDetails(GetDetails(index)).index());
|
|
} else {
|
|
descriptor->SetEnumerationIndex(enumeration_index);
|
|
++enumeration_index;
|
|
}
|
|
}
|
|
new_descriptors->SetNextEnumerationIndex(enumeration_index);
|
|
|
|
// Copy the descriptors, filtering out transitions and null descriptors,
|
|
// and inserting or replacing a descriptor.
|
|
DescriptorWriter w(new_descriptors);
|
|
DescriptorReader r(this);
|
|
uint32_t descriptor_hash = descriptor->GetKey()->Hash();
|
|
|
|
for (; !r.eos(); r.advance()) {
|
|
if (r.GetKey()->Hash() > descriptor_hash ||
|
|
r.GetKey() == descriptor->GetKey()) break;
|
|
if (r.IsNullDescriptor()) continue;
|
|
if (remove_transitions && r.IsTransition()) continue;
|
|
w.WriteFrom(&r);
|
|
}
|
|
w.Write(descriptor);
|
|
if (replacing) {
|
|
ASSERT(r.GetKey() == descriptor->GetKey());
|
|
r.advance();
|
|
} else {
|
|
ASSERT(r.eos() || r.GetKey()->Hash() > descriptor_hash);
|
|
}
|
|
for (; !r.eos(); r.advance()) {
|
|
if (r.IsNullDescriptor()) continue;
|
|
if (remove_transitions && r.IsTransition()) continue;
|
|
w.WriteFrom(&r);
|
|
}
|
|
ASSERT(w.eos());
|
|
|
|
return new_descriptors;
|
|
}
|
|
|
|
|
|
Object* DescriptorArray::CopyReplace(String* name,
|
|
int index,
|
|
PropertyAttributes attributes) {
|
|
// Allocate the new descriptor array.
|
|
Object* result = DescriptorArray::Allocate(number_of_descriptors());
|
|
if (result->IsFailure()) return result;
|
|
|
|
// Make sure only symbols are added to the instance descriptor.
|
|
if (!name->IsSymbol()) {
|
|
Object* result = Heap::LookupSymbol(name);
|
|
if (result->IsFailure()) return result;
|
|
name = String::cast(result);
|
|
}
|
|
|
|
DescriptorWriter w(DescriptorArray::cast(result));
|
|
for (DescriptorReader r(this); !r.eos(); r.advance()) {
|
|
if (r.Equals(name)) {
|
|
FieldDescriptor d(name, index, attributes);
|
|
d.SetEnumerationIndex(r.GetDetails().index());
|
|
w.Write(&d);
|
|
} else {
|
|
w.WriteFrom(&r);
|
|
}
|
|
}
|
|
|
|
// Copy the next enumeration index.
|
|
DescriptorArray::cast(result)->
|
|
SetNextEnumerationIndex(NextEnumerationIndex());
|
|
|
|
ASSERT(w.eos());
|
|
return result;
|
|
}
|
|
|
|
|
|
Object* DescriptorArray::CopyRemove(String* name) {
|
|
if (!name->IsSymbol()) {
|
|
Object* result = Heap::LookupSymbol(name);
|
|
if (result->IsFailure()) return result;
|
|
name = String::cast(result);
|
|
}
|
|
ASSERT(name->IsSymbol());
|
|
Object* result = Allocate(number_of_descriptors() - 1);
|
|
if (result->IsFailure()) return result;
|
|
DescriptorArray* new_descriptors = DescriptorArray::cast(result);
|
|
|
|
// Set the enumeration index in the descriptors and set the enumeration index
|
|
// in the result.
|
|
new_descriptors->SetNextEnumerationIndex(NextEnumerationIndex());
|
|
// Write the old content and the descriptor information
|
|
DescriptorWriter w(new_descriptors);
|
|
DescriptorReader r(this);
|
|
while (!r.eos()) {
|
|
if (r.GetKey() != name) { // Both are symbols; object identity suffices.
|
|
w.WriteFrom(&r);
|
|
}
|
|
r.advance();
|
|
}
|
|
ASSERT(w.eos());
|
|
|
|
return new_descriptors;
|
|
}
|
|
|
|
|
|
Object* DescriptorArray::RemoveTransitions() {
|
|
// Remove all transitions. Return a copy of the array with all transitions
|
|
// removed, or a Failure object if the new array could not be allocated.
|
|
|
|
// Compute the size of the map transition entries to be removed.
|
|
int count_transitions = 0;
|
|
for (DescriptorReader r(this); !r.eos(); r.advance()) {
|
|
if (r.IsTransition()) count_transitions++;
|
|
}
|
|
|
|
// Allocate the new descriptor array.
|
|
Object* result = Allocate(number_of_descriptors() - count_transitions);
|
|
if (result->IsFailure()) return result;
|
|
DescriptorArray* new_descriptors = DescriptorArray::cast(result);
|
|
|
|
// Copy the content.
|
|
DescriptorWriter w(new_descriptors);
|
|
for (DescriptorReader r(this); !r.eos(); r.advance()) {
|
|
if (!r.IsTransition()) w.WriteFrom(&r);
|
|
}
|
|
ASSERT(w.eos());
|
|
|
|
return new_descriptors;
|
|
}
|
|
|
|
|
|
void DescriptorArray::Sort() {
|
|
// In-place heap sort.
|
|
int len = number_of_descriptors();
|
|
|
|
// Bottom-up max-heap construction.
|
|
for (int i = 1; i < len; ++i) {
|
|
int child_index = i;
|
|
while (child_index > 0) {
|
|
int parent_index = ((child_index + 1) >> 1) - 1;
|
|
uint32_t parent_hash = GetKey(parent_index)->Hash();
|
|
uint32_t child_hash = GetKey(child_index)->Hash();
|
|
if (parent_hash < child_hash) {
|
|
Swap(parent_index, child_index);
|
|
} else {
|
|
break;
|
|
}
|
|
child_index = parent_index;
|
|
}
|
|
}
|
|
|
|
// Extract elements and create sorted array.
|
|
for (int i = len - 1; i > 0; --i) {
|
|
// Put max element at the back of the array.
|
|
Swap(0, i);
|
|
// Sift down the new top element.
|
|
int parent_index = 0;
|
|
while (true) {
|
|
int child_index = ((parent_index + 1) << 1) - 1;
|
|
if (child_index >= i) break;
|
|
uint32_t child1_hash = GetKey(child_index)->Hash();
|
|
uint32_t child2_hash = GetKey(child_index + 1)->Hash();
|
|
uint32_t parent_hash = GetKey(parent_index)->Hash();
|
|
if (child_index + 1 >= i || child1_hash > child2_hash) {
|
|
if (parent_hash > child1_hash) break;
|
|
Swap(parent_index, child_index);
|
|
parent_index = child_index;
|
|
} else {
|
|
if (parent_hash > child2_hash) break;
|
|
Swap(parent_index, child_index + 1);
|
|
parent_index = child_index + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
SLOW_ASSERT(IsSortedNoDuplicates());
|
|
}
|
|
|
|
|
|
int DescriptorArray::BinarySearch(String* name, int low, int high) {
|
|
uint32_t hash = name->Hash();
|
|
|
|
while (low <= high) {
|
|
int mid = (low + high) / 2;
|
|
String* mid_name = GetKey(mid);
|
|
uint32_t mid_hash = mid_name->Hash();
|
|
|
|
if (mid_hash > hash) {
|
|
high = mid - 1;
|
|
continue;
|
|
}
|
|
if (mid_hash < hash) {
|
|
low = mid + 1;
|
|
continue;
|
|
}
|
|
// Found an element with the same hash-code.
|
|
ASSERT(hash == mid_hash);
|
|
// There might be more, so we find the first one and
|
|
// check them all to see if we have a match.
|
|
if (name == mid_name) return mid;
|
|
while ((mid > low) && (GetKey(mid - 1)->Hash() == hash)) mid--;
|
|
for (; (mid <= high) && (GetKey(mid)->Hash() == hash); mid++) {
|
|
if (GetKey(mid)->Equals(name)) return mid;
|
|
}
|
|
break;
|
|
}
|
|
return kNotFound;
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
bool DescriptorArray::IsEqualTo(DescriptorArray* other) {
|
|
if (IsEmpty()) return other->IsEmpty();
|
|
if (other->IsEmpty()) return false;
|
|
if (length() != other->length()) return false;
|
|
for (int i = 0; i < length(); ++i) {
|
|
if (get(i) != other->get(i) && i != kContentArrayIndex) return false;
|
|
}
|
|
return GetContentArray()->IsEqualTo(other->GetContentArray());
|
|
}
|
|
#endif
|
|
|
|
|
|
static StaticResource<StringInputBuffer> string_input_buffer;
|
|
|
|
|
|
bool String::LooksValid() {
|
|
if (!Heap::Contains(this))
|
|
return false;
|
|
switch (representation_tag()) {
|
|
case kSeqStringTag:
|
|
case kConsStringTag:
|
|
case kSlicedStringTag:
|
|
case kExternalStringTag:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
int String::Utf8Length() {
|
|
if (is_ascii()) return length();
|
|
// Attempt to flatten before accessing the string. It probably
|
|
// doesn't make Utf8Length faster, but it is very likely that
|
|
// the string will be accessed later (for example by WriteUtf8)
|
|
// so it's still a good idea.
|
|
TryFlatten();
|
|
Access<StringInputBuffer> buffer(&string_input_buffer);
|
|
buffer->Reset(0, this);
|
|
int result = 0;
|
|
while (buffer->has_more())
|
|
result += unibrow::Utf8::Length(buffer->GetNext());
|
|
return result;
|
|
}
|
|
|
|
|
|
SmartPointer<char> String::ToCString(AllowNullsFlag allow_nulls,
|
|
RobustnessFlag robust_flag,
|
|
int offset,
|
|
int length,
|
|
int* length_return) {
|
|
ASSERT(NativeAllocationChecker::allocation_allowed());
|
|
if (robust_flag == ROBUST_STRING_TRAVERSAL && !LooksValid()) {
|
|
return SmartPointer<char>(NULL);
|
|
}
|
|
|
|
// Negative length means the to the end of the string.
|
|
if (length < 0) length = kMaxInt - offset;
|
|
|
|
// Compute the size of the UTF-8 string. Start at the specified offset.
|
|
Access<StringInputBuffer> buffer(&string_input_buffer);
|
|
buffer->Reset(offset, this);
|
|
int character_position = offset;
|
|
int utf8_bytes = 0;
|
|
while (buffer->has_more()) {
|
|
uint16_t character = buffer->GetNext();
|
|
if (character_position < offset + length) {
|
|
utf8_bytes += unibrow::Utf8::Length(character);
|
|
}
|
|
character_position++;
|
|
}
|
|
|
|
if (length_return) {
|
|
*length_return = utf8_bytes;
|
|
}
|
|
|
|
char* result = NewArray<char>(utf8_bytes + 1);
|
|
|
|
// Convert the UTF-16 string to a UTF-8 buffer. Start at the specified offset.
|
|
buffer->Rewind();
|
|
buffer->Seek(offset);
|
|
character_position = offset;
|
|
int utf8_byte_position = 0;
|
|
while (buffer->has_more()) {
|
|
uint16_t character = buffer->GetNext();
|
|
if (character_position < offset + length) {
|
|
if (allow_nulls == DISALLOW_NULLS && character == 0) {
|
|
character = ' ';
|
|
}
|
|
utf8_byte_position +=
|
|
unibrow::Utf8::Encode(result + utf8_byte_position, character);
|
|
}
|
|
character_position++;
|
|
}
|
|
result[utf8_byte_position] = 0;
|
|
return SmartPointer<char>(result);
|
|
}
|
|
|
|
|
|
SmartPointer<char> String::ToCString(AllowNullsFlag allow_nulls,
|
|
RobustnessFlag robust_flag,
|
|
int* length_return) {
|
|
return ToCString(allow_nulls, robust_flag, 0, -1, length_return);
|
|
}
|
|
|
|
|
|
const uc16* String::GetTwoByteData() {
|
|
return GetTwoByteData(0);
|
|
}
|
|
|
|
|
|
const uc16* String::GetTwoByteData(unsigned start) {
|
|
ASSERT(!IsAscii());
|
|
switch (representation_tag()) {
|
|
case kSeqStringTag:
|
|
return TwoByteString::cast(this)->TwoByteStringGetData(start);
|
|
case kExternalStringTag:
|
|
return ExternalTwoByteString::cast(this)->
|
|
ExternalTwoByteStringGetData(start);
|
|
case kSlicedStringTag: {
|
|
SlicedString* sliced_string = SlicedString::cast(this);
|
|
String* buffer = String::cast(sliced_string->buffer());
|
|
if (buffer->StringIsConsString()) {
|
|
ConsString* cons_string = ConsString::cast(buffer);
|
|
// Flattened string.
|
|
ASSERT(String::cast(cons_string->second())->length() == 0);
|
|
buffer = String::cast(cons_string->first());
|
|
}
|
|
return buffer->GetTwoByteData(start + sliced_string->start());
|
|
}
|
|
case kConsStringTag:
|
|
UNREACHABLE();
|
|
return NULL;
|
|
}
|
|
UNREACHABLE();
|
|
return NULL;
|
|
}
|
|
|
|
|
|
SmartPointer<uc16> String::ToWideCString(RobustnessFlag robust_flag) {
|
|
ASSERT(NativeAllocationChecker::allocation_allowed());
|
|
|
|
if (robust_flag == ROBUST_STRING_TRAVERSAL && !LooksValid()) {
|
|
return SmartPointer<uc16>();
|
|
}
|
|
|
|
Access<StringInputBuffer> buffer(&string_input_buffer);
|
|
buffer->Reset(this);
|
|
|
|
uc16* result = NewArray<uc16>(length() + 1);
|
|
|
|
int i = 0;
|
|
while (buffer->has_more()) {
|
|
uint16_t character = buffer->GetNext();
|
|
result[i++] = character;
|
|
}
|
|
result[i] = 0;
|
|
return SmartPointer<uc16>(result);
|
|
}
|
|
|
|
|
|
const uc16* TwoByteString::TwoByteStringGetData(unsigned start) {
|
|
return reinterpret_cast<uc16*>(
|
|
reinterpret_cast<char*>(this) - kHeapObjectTag + kHeaderSize) + start;
|
|
}
|
|
|
|
|
|
void TwoByteString::TwoByteStringReadBlockIntoBuffer(ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
unsigned chars_read = 0;
|
|
unsigned offset = *offset_ptr;
|
|
while (chars_read < max_chars) {
|
|
uint16_t c = *reinterpret_cast<uint16_t*>(
|
|
reinterpret_cast<char*>(this) -
|
|
kHeapObjectTag + kHeaderSize + offset * kShortSize);
|
|
if (c <= kMaxAsciiCharCode) {
|
|
// Fast case for ASCII characters. Cursor is an input output argument.
|
|
if (!unibrow::CharacterStream::EncodeAsciiCharacter(c,
|
|
rbb->util_buffer,
|
|
rbb->capacity,
|
|
rbb->cursor)) {
|
|
break;
|
|
}
|
|
} else {
|
|
if (!unibrow::CharacterStream::EncodeNonAsciiCharacter(c,
|
|
rbb->util_buffer,
|
|
rbb->capacity,
|
|
rbb->cursor)) {
|
|
break;
|
|
}
|
|
}
|
|
offset++;
|
|
chars_read++;
|
|
}
|
|
*offset_ptr = offset;
|
|
rbb->remaining += chars_read;
|
|
}
|
|
|
|
|
|
const unibrow::byte* AsciiString::AsciiStringReadBlock(unsigned* remaining,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
// Cast const char* to unibrow::byte* (signedness difference).
|
|
const unibrow::byte* b = reinterpret_cast<unibrow::byte*>(this) -
|
|
kHeapObjectTag + kHeaderSize + *offset_ptr * kCharSize;
|
|
*remaining = max_chars;
|
|
*offset_ptr += max_chars;
|
|
return b;
|
|
}
|
|
|
|
|
|
// This will iterate unless the block of string data spans two 'halves' of
|
|
// a ConsString, in which case it will recurse. Since the block of string
|
|
// data to be read has a maximum size this limits the maximum recursion
|
|
// depth to something sane. Since C++ does not have tail call recursion
|
|
// elimination, the iteration must be explicit. Since this is not an
|
|
// -IntoBuffer method it can delegate to one of the efficient
|
|
// *AsciiStringReadBlock routines.
|
|
const unibrow::byte* ConsString::ConsStringReadBlock(ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
ConsString* current = this;
|
|
unsigned offset = *offset_ptr;
|
|
int offset_correction = 0;
|
|
|
|
while (true) {
|
|
String* left = String::cast(current->first());
|
|
unsigned left_length = (unsigned)left->length();
|
|
if (left_length > offset &&
|
|
(max_chars <= left_length - offset ||
|
|
(rbb->capacity <= left_length - offset &&
|
|
(max_chars = left_length - offset, true)))) { // comma operator!
|
|
// Left hand side only - iterate unless we have reached the bottom of
|
|
// the cons tree. The assignment on the left of the comma operator is
|
|
// in order to make use of the fact that the -IntoBuffer routines can
|
|
// produce at most 'capacity' characters. This enables us to postpone
|
|
// the point where we switch to the -IntoBuffer routines (below) in order
|
|
// to maximize the chances of delegating a big chunk of work to the
|
|
// efficient *AsciiStringReadBlock routines.
|
|
if (left->StringIsConsString()) {
|
|
current = ConsString::cast(left);
|
|
continue;
|
|
} else {
|
|
const unibrow::byte* answer =
|
|
String::ReadBlock(left, rbb, &offset, max_chars);
|
|
*offset_ptr = offset + offset_correction;
|
|
return answer;
|
|
}
|
|
} else if (left_length <= offset) {
|
|
// Right hand side only - iterate unless we have reached the bottom of
|
|
// the cons tree.
|
|
String* right = String::cast(current->second());
|
|
offset -= left_length;
|
|
offset_correction += left_length;
|
|
if (right->StringIsConsString()) {
|
|
current = ConsString::cast(right);
|
|
continue;
|
|
} else {
|
|
const unibrow::byte* answer =
|
|
String::ReadBlock(right, rbb, &offset, max_chars);
|
|
*offset_ptr = offset + offset_correction;
|
|
return answer;
|
|
}
|
|
} else {
|
|
// The block to be read spans two sides of the ConsString, so we call the
|
|
// -IntoBuffer version, which will recurse. The -IntoBuffer methods
|
|
// are able to assemble data from several part strings because they use
|
|
// the util_buffer to store their data and never return direct pointers
|
|
// to their storage. We don't try to read more than the buffer capacity
|
|
// here or we can get too much recursion.
|
|
ASSERT(rbb->remaining == 0);
|
|
ASSERT(rbb->cursor == 0);
|
|
current->ConsStringReadBlockIntoBuffer(
|
|
rbb,
|
|
&offset,
|
|
max_chars > rbb->capacity ? rbb->capacity : max_chars);
|
|
*offset_ptr = offset + offset_correction;
|
|
return rbb->util_buffer;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
const unibrow::byte* SlicedString::SlicedStringReadBlock(ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
String* backing = String::cast(buffer());
|
|
unsigned offset = start() + *offset_ptr;
|
|
unsigned length = backing->length();
|
|
if (max_chars > length - offset) {
|
|
max_chars = length - offset;
|
|
}
|
|
const unibrow::byte* answer =
|
|
String::ReadBlock(backing, rbb, &offset, max_chars);
|
|
*offset_ptr = offset - start();
|
|
return answer;
|
|
}
|
|
|
|
|
|
uint16_t ExternalAsciiString::ExternalAsciiStringGet(int index) {
|
|
ASSERT(index >= 0 && index < length());
|
|
return resource()->data()[index];
|
|
}
|
|
|
|
|
|
const unibrow::byte* ExternalAsciiString::ExternalAsciiStringReadBlock(
|
|
unsigned* remaining,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
// Cast const char* to unibrow::byte* (signedness difference).
|
|
const unibrow::byte* b =
|
|
reinterpret_cast<const unibrow::byte*>(resource()->data()) + *offset_ptr;
|
|
*remaining = max_chars;
|
|
*offset_ptr += max_chars;
|
|
return b;
|
|
}
|
|
|
|
|
|
const uc16* ExternalTwoByteString::ExternalTwoByteStringGetData(
|
|
unsigned start) {
|
|
return resource()->data() + start;
|
|
}
|
|
|
|
|
|
uint16_t ExternalTwoByteString::ExternalTwoByteStringGet(int index) {
|
|
ASSERT(index >= 0 && index < length());
|
|
return resource()->data()[index];
|
|
}
|
|
|
|
|
|
void ExternalTwoByteString::ExternalTwoByteStringReadBlockIntoBuffer(
|
|
ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
unsigned chars_read = 0;
|
|
unsigned offset = *offset_ptr;
|
|
const uint16_t* data = resource()->data();
|
|
while (chars_read < max_chars) {
|
|
uint16_t c = data[offset];
|
|
if (c <= kMaxAsciiCharCode) {
|
|
// Fast case for ASCII characters. Cursor is an input output argument.
|
|
if (!unibrow::CharacterStream::EncodeAsciiCharacter(c,
|
|
rbb->util_buffer,
|
|
rbb->capacity,
|
|
rbb->cursor))
|
|
break;
|
|
} else {
|
|
if (!unibrow::CharacterStream::EncodeNonAsciiCharacter(c,
|
|
rbb->util_buffer,
|
|
rbb->capacity,
|
|
rbb->cursor))
|
|
break;
|
|
}
|
|
offset++;
|
|
chars_read++;
|
|
}
|
|
*offset_ptr = offset;
|
|
rbb->remaining += chars_read;
|
|
}
|
|
|
|
|
|
void AsciiString::AsciiStringReadBlockIntoBuffer(ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
unsigned capacity = rbb->capacity - rbb->cursor;
|
|
if (max_chars > capacity) max_chars = capacity;
|
|
memcpy(rbb->util_buffer + rbb->cursor,
|
|
reinterpret_cast<char*>(this) - kHeapObjectTag + kHeaderSize +
|
|
*offset_ptr * kCharSize,
|
|
max_chars);
|
|
rbb->remaining += max_chars;
|
|
*offset_ptr += max_chars;
|
|
rbb->cursor += max_chars;
|
|
}
|
|
|
|
|
|
void ExternalAsciiString::ExternalAsciiStringReadBlockIntoBuffer(
|
|
ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
unsigned capacity = rbb->capacity - rbb->cursor;
|
|
if (max_chars > capacity) max_chars = capacity;
|
|
memcpy(rbb->util_buffer + rbb->cursor,
|
|
resource()->data() + *offset_ptr,
|
|
max_chars);
|
|
rbb->remaining += max_chars;
|
|
*offset_ptr += max_chars;
|
|
rbb->cursor += max_chars;
|
|
}
|
|
|
|
|
|
// This method determines the type of string involved and then copies
|
|
// a whole chunk of characters into a buffer, or returns a pointer to a buffer
|
|
// where they can be found. The pointer is not necessarily valid across a GC
|
|
// (see AsciiStringReadBlock).
|
|
const unibrow::byte* String::ReadBlock(String* input,
|
|
ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
ASSERT(*offset_ptr <= static_cast<unsigned>(input->length()));
|
|
if (max_chars == 0) {
|
|
rbb->remaining = 0;
|
|
return NULL;
|
|
}
|
|
switch (input->representation_tag()) {
|
|
case kSeqStringTag:
|
|
if (input->is_ascii()) {
|
|
return AsciiString::cast(input)->AsciiStringReadBlock(&rbb->remaining,
|
|
offset_ptr,
|
|
max_chars);
|
|
} else {
|
|
TwoByteString::cast(input)->TwoByteStringReadBlockIntoBuffer(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
return rbb->util_buffer;
|
|
}
|
|
case kConsStringTag:
|
|
return ConsString::cast(input)->ConsStringReadBlock(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
case kSlicedStringTag:
|
|
return SlicedString::cast(input)->SlicedStringReadBlock(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
case kExternalStringTag:
|
|
if (input->is_ascii()) {
|
|
return ExternalAsciiString::cast(input)->ExternalAsciiStringReadBlock(
|
|
&rbb->remaining,
|
|
offset_ptr,
|
|
max_chars);
|
|
} else {
|
|
ExternalTwoByteString::cast(input)->
|
|
ExternalTwoByteStringReadBlockIntoBuffer(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
return rbb->util_buffer;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
UNREACHABLE();
|
|
return 0;
|
|
}
|
|
|
|
|
|
void StringInputBuffer::Seek(unsigned pos) {
|
|
Reset(pos, input_);
|
|
}
|
|
|
|
|
|
void SafeStringInputBuffer::Seek(unsigned pos) {
|
|
Reset(pos, input_);
|
|
}
|
|
|
|
|
|
// This method determines the type of string involved and then copies
|
|
// a whole chunk of characters into a buffer. It can be used with strings
|
|
// that have been glued together to form a ConsString and which must cooperate
|
|
// to fill up a buffer.
|
|
void String::ReadBlockIntoBuffer(String* input,
|
|
ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
ASSERT(*offset_ptr <= (unsigned)input->length());
|
|
if (max_chars == 0) return;
|
|
|
|
switch (input->representation_tag()) {
|
|
case kSeqStringTag:
|
|
if (input->is_ascii()) {
|
|
AsciiString::cast(input)->AsciiStringReadBlockIntoBuffer(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
return;
|
|
} else {
|
|
TwoByteString::cast(input)->TwoByteStringReadBlockIntoBuffer(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
return;
|
|
}
|
|
case kConsStringTag:
|
|
ConsString::cast(input)->ConsStringReadBlockIntoBuffer(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
return;
|
|
case kSlicedStringTag:
|
|
SlicedString::cast(input)->SlicedStringReadBlockIntoBuffer(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
return;
|
|
case kExternalStringTag:
|
|
if (input->is_ascii()) {
|
|
ExternalAsciiString::cast(input)->
|
|
ExternalAsciiStringReadBlockIntoBuffer(rbb, offset_ptr, max_chars);
|
|
} else {
|
|
ExternalTwoByteString::cast(input)->
|
|
ExternalTwoByteStringReadBlockIntoBuffer(rbb,
|
|
offset_ptr,
|
|
max_chars);
|
|
}
|
|
return;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
UNREACHABLE();
|
|
return;
|
|
}
|
|
|
|
|
|
const unibrow::byte* String::ReadBlock(String* input,
|
|
unibrow::byte* util_buffer,
|
|
unsigned capacity,
|
|
unsigned* remaining,
|
|
unsigned* offset_ptr) {
|
|
ASSERT(*offset_ptr <= (unsigned)input->length());
|
|
unsigned chars = input->length() - *offset_ptr;
|
|
ReadBlockBuffer rbb(util_buffer, 0, capacity, 0);
|
|
const unibrow::byte* answer = ReadBlock(input, &rbb, offset_ptr, chars);
|
|
ASSERT(rbb.remaining <= static_cast<unsigned>(input->length()));
|
|
*remaining = rbb.remaining;
|
|
return answer;
|
|
}
|
|
|
|
|
|
const unibrow::byte* String::ReadBlock(String** raw_input,
|
|
unibrow::byte* util_buffer,
|
|
unsigned capacity,
|
|
unsigned* remaining,
|
|
unsigned* offset_ptr) {
|
|
Handle<String> input(raw_input);
|
|
ASSERT(*offset_ptr <= (unsigned)input->length());
|
|
unsigned chars = input->length() - *offset_ptr;
|
|
if (chars > capacity) chars = capacity;
|
|
ReadBlockBuffer rbb(util_buffer, 0, capacity, 0);
|
|
ReadBlockIntoBuffer(*input, &rbb, offset_ptr, chars);
|
|
ASSERT(rbb.remaining <= static_cast<unsigned>(input->length()));
|
|
*remaining = rbb.remaining;
|
|
return rbb.util_buffer;
|
|
}
|
|
|
|
|
|
// This will iterate unless the block of string data spans two 'halves' of
|
|
// a ConsString, in which case it will recurse. Since the block of string
|
|
// data to be read has a maximum size this limits the maximum recursion
|
|
// depth to something sane. Since C++ does not have tail call recursion
|
|
// elimination, the iteration must be explicit.
|
|
void ConsString::ConsStringReadBlockIntoBuffer(ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
ConsString* current = this;
|
|
unsigned offset = *offset_ptr;
|
|
int offset_correction = 0;
|
|
|
|
while (true) {
|
|
String* left = String::cast(current->first());
|
|
unsigned left_length = (unsigned)left->length();
|
|
if (left_length > offset &&
|
|
max_chars <= left_length - offset) {
|
|
// Left hand side only - iterate unless we have reached the bottom of
|
|
// the cons tree.
|
|
if (left->StringIsConsString()) {
|
|
current = ConsString::cast(left);
|
|
continue;
|
|
} else {
|
|
String::ReadBlockIntoBuffer(left, rbb, &offset, max_chars);
|
|
*offset_ptr = offset + offset_correction;
|
|
return;
|
|
}
|
|
} else if (left_length <= offset) {
|
|
// Right hand side only - iterate unless we have reached the bottom of
|
|
// the cons tree.
|
|
offset -= left_length;
|
|
offset_correction += left_length;
|
|
String* right = String::cast(current->second());
|
|
if (right->StringIsConsString()) {
|
|
current = ConsString::cast(right);
|
|
continue;
|
|
} else {
|
|
String::ReadBlockIntoBuffer(right, rbb, &offset, max_chars);
|
|
*offset_ptr = offset + offset_correction;
|
|
return;
|
|
}
|
|
} else {
|
|
// The block to be read spans two sides of the ConsString, so we recurse.
|
|
// First recurse on the left.
|
|
max_chars -= left_length - offset;
|
|
String::ReadBlockIntoBuffer(left, rbb, &offset, left_length - offset);
|
|
// We may have reached the max or there may not have been enough space
|
|
// in the buffer for the characters in the left hand side.
|
|
if (offset == left_length) {
|
|
// Recurse on the right.
|
|
String* right = String::cast(current->second());
|
|
offset -= left_length;
|
|
offset_correction += left_length;
|
|
String::ReadBlockIntoBuffer(right, rbb, &offset, max_chars);
|
|
}
|
|
*offset_ptr = offset + offset_correction;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void SlicedString::SlicedStringReadBlockIntoBuffer(ReadBlockBuffer* rbb,
|
|
unsigned* offset_ptr,
|
|
unsigned max_chars) {
|
|
String* backing = String::cast(buffer());
|
|
unsigned offset = start() + *offset_ptr;
|
|
unsigned length = backing->length();
|
|
if (max_chars > length - offset) {
|
|
max_chars = length - offset;
|
|
}
|
|
String::ReadBlockIntoBuffer(backing, rbb, &offset, max_chars);
|
|
*offset_ptr = offset - start();
|
|
}
|
|
|
|
|
|
void ConsString::ConsStringIterateBody(ObjectVisitor* v) {
|
|
IteratePointers(v, kFirstOffset, kSecondOffset + kPointerSize);
|
|
}
|
|
|
|
|
|
uint16_t ConsString::ConsStringGet(int index) {
|
|
ASSERT(index >= 0 && index < this->length());
|
|
|
|
// Check for a flattened cons string
|
|
if (String::cast(second())->length() == 0) {
|
|
return String::cast(first())->Get(index);
|
|
}
|
|
|
|
String* string = String::cast(this);
|
|
|
|
while (true) {
|
|
if (string->StringIsConsString()) {
|
|
ConsString* cons_string = ConsString::cast(string);
|
|
String* left = String::cast(cons_string->first());
|
|
if (left->length() > index) {
|
|
string = left;
|
|
} else {
|
|
index -= left->length();
|
|
string = String::cast(cons_string->second());
|
|
}
|
|
} else {
|
|
return string->Get(index);
|
|
}
|
|
}
|
|
|
|
UNREACHABLE();
|
|
return 0;
|
|
}
|
|
|
|
|
|
Object* SlicedString::SlicedStringFlatten() {
|
|
// The SlicedString constructor should ensure that there are no
|
|
// SlicedStrings that are constructed directly on top of other
|
|
// SlicedStrings.
|
|
String* buf = String::cast(buffer());
|
|
ASSERT(!buf->StringIsSlicedString());
|
|
if (buf->StringIsConsString()) {
|
|
Object* ok = buf->Flatten();
|
|
if (ok->IsFailure()) return ok;
|
|
}
|
|
return this;
|
|
}
|
|
|
|
|
|
void String::Flatten(String* src, String* sink, int f, int t, int so) {
|
|
String* source = src;
|
|
int from = f;
|
|
int to = t;
|
|
int sink_offset = so;
|
|
while (true) {
|
|
ASSERT(0 <= from && from <= to && to <= source->length());
|
|
ASSERT(0 <= sink_offset && sink_offset < sink->length());
|
|
switch (source->representation_tag()) {
|
|
case kSeqStringTag:
|
|
case kExternalStringTag: {
|
|
Access<StringInputBuffer> buffer(&string_input_buffer);
|
|
buffer->Reset(from, source);
|
|
int j = sink_offset;
|
|
for (int i = from; i < to; i++) {
|
|
sink->Set(j++, buffer->GetNext());
|
|
}
|
|
return;
|
|
}
|
|
case kSlicedStringTag: {
|
|
SlicedString* sliced_string = SlicedString::cast(source);
|
|
int start = sliced_string->start();
|
|
from += start;
|
|
to += start;
|
|
source = String::cast(sliced_string->buffer());
|
|
}
|
|
break;
|
|
case kConsStringTag: {
|
|
ConsString* cons_string = ConsString::cast(source);
|
|
String* first = String::cast(cons_string->first());
|
|
int boundary = first->length();
|
|
if (to - boundary > boundary - from) {
|
|
// Right hand side is longer. Recurse over left.
|
|
if (from < boundary) {
|
|
Flatten(first, sink, from, boundary, sink_offset);
|
|
sink_offset += boundary - from;
|
|
from = 0;
|
|
} else {
|
|
from -= boundary;
|
|
}
|
|
to -= boundary;
|
|
source = String::cast(cons_string->second());
|
|
} else {
|
|
// Left hand side is longer. Recurse over right.
|
|
if (to > boundary) {
|
|
String* second = String::cast(cons_string->second());
|
|
Flatten(second,
|
|
sink,
|
|
0,
|
|
to - boundary,
|
|
sink_offset + boundary - from);
|
|
to = boundary;
|
|
}
|
|
source = first;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void SlicedString::SlicedStringIterateBody(ObjectVisitor* v) {
|
|
IteratePointer(v, kBufferOffset);
|
|
}
|
|
|
|
|
|
uint16_t SlicedString::SlicedStringGet(int index) {
|
|
ASSERT(index >= 0 && index < this->length());
|
|
// Delegate to the buffer string.
|
|
return String::cast(buffer())->Get(start() + index);
|
|
}
|
|
|
|
|
|
bool String::SlowEquals(String* other) {
|
|
// Fast check: negative check with lengths.
|
|
int len = length();
|
|
if (len != other->length()) return false;
|
|
if (len == 0) return true;
|
|
|
|
// Fast check: if hash code is computed for both strings
|
|
// a fast negative check can be performed.
|
|
if (HasHashCode() && other->HasHashCode()) {
|
|
if (Hash() != other->Hash()) return false;
|
|
}
|
|
|
|
// Fast case: avoid input buffers for small strings.
|
|
const int kMaxLenthForFastCaseCheck = 5;
|
|
for (int i = 0; i < kMaxLenthForFastCaseCheck; i++) {
|
|
if (Get(i) != other->Get(i)) return false;
|
|
if (i + 1 == len) return true;
|
|
}
|
|
|
|
// General slow case check.
|
|
static StringInputBuffer buf1;
|
|
static StringInputBuffer buf2;
|
|
buf1.Reset(kMaxLenthForFastCaseCheck, this);
|
|
buf2.Reset(kMaxLenthForFastCaseCheck, other);
|
|
while (buf1.has_more()) {
|
|
if (buf1.GetNext() != buf2.GetNext()) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
bool String::MarkAsUndetectable() {
|
|
if (this->IsSymbol()) return false;
|
|
|
|
Map* map = this->map();
|
|
if (map == Heap::short_string_map()) {
|
|
this->set_map(Heap::undetectable_short_string_map());
|
|
return true;
|
|
} else if (map == Heap::medium_string_map()) {
|
|
this->set_map(Heap::undetectable_medium_string_map());
|
|
return true;
|
|
} else if (map == Heap::long_string_map()) {
|
|
this->set_map(Heap::undetectable_long_string_map());
|
|
return true;
|
|
} else if (map == Heap::short_ascii_string_map()) {
|
|
this->set_map(Heap::undetectable_short_ascii_string_map());
|
|
return true;
|
|
} else if (map == Heap::medium_ascii_string_map()) {
|
|
this->set_map(Heap::undetectable_medium_ascii_string_map());
|
|
return true;
|
|
} else if (map == Heap::long_ascii_string_map()) {
|
|
this->set_map(Heap::undetectable_long_ascii_string_map());
|
|
return true;
|
|
}
|
|
// Rest cannot be marked as undetectable
|
|
return false;
|
|
}
|
|
|
|
|
|
bool String::IsEqualTo(Vector<const char> str) {
|
|
int slen = length();
|
|
Access<Scanner::Utf8Decoder> decoder(Scanner::utf8_decoder());
|
|
decoder->Reset(str.start(), str.length());
|
|
int i;
|
|
for (i = 0; i < slen && decoder->has_more(); i++) {
|
|
uc32 r = decoder->GetNext();
|
|
if (Get(i) != r) return false;
|
|
}
|
|
return i == slen && !decoder->has_more();
|
|
}
|
|
|
|
|
|
uint32_t String::ComputeAndSetHash() {
|
|
// Should only be call if hash code has not yet been computed.
|
|
ASSERT(!(length_field() & kHashComputedMask));
|
|
|
|
// Compute the hash code.
|
|
StringInputBuffer buffer(this);
|
|
int hash = ComputeHashCode(&buffer, length());
|
|
|
|
// Store the hash code in the object.
|
|
set_length_field(hash);
|
|
|
|
// Check the hash code is there.
|
|
ASSERT(length_field() & kHashComputedMask);
|
|
return hash;
|
|
}
|
|
|
|
|
|
bool String::ComputeArrayIndex(unibrow::CharacterStream* buffer,
|
|
uint32_t* index,
|
|
int length) {
|
|
if (length == 0) return false;
|
|
uc32 ch = buffer->GetNext();
|
|
|
|
// If the string begins with a '0' character, it must only consist
|
|
// of it to be a legal array index.
|
|
if (ch == '0') {
|
|
*index = 0;
|
|
return length == 1;
|
|
}
|
|
|
|
// Convert string to uint32 array index; character by character.
|
|
int d = ch - '0';
|
|
if (d < 0 || d > 9) return false;
|
|
uint32_t result = d;
|
|
while (buffer->has_more()) {
|
|
d = buffer->GetNext() - '0';
|
|
if (d < 0 || d > 9) return false;
|
|
// Check that the new result is below the 32 bit limit.
|
|
if (result > 429496729U - ((d > 5) ? 1 : 0)) return false;
|
|
result = (result * 10) + d;
|
|
}
|
|
|
|
*index = result;
|
|
return true;
|
|
}
|
|
|
|
|
|
bool String::SlowAsArrayIndex(uint32_t* index) {
|
|
StringInputBuffer buffer(this);
|
|
return ComputeArrayIndex(&buffer, index, length());
|
|
}
|
|
|
|
|
|
static inline uint32_t HashField(uint32_t hash, bool is_array_index) {
|
|
return (hash << String::kLongLengthShift) | (is_array_index ? 3 : 1);
|
|
}
|
|
|
|
|
|
uint32_t String::ComputeHashCode(unibrow::CharacterStream* buffer,
|
|
int length) {
|
|
// Large string (please note large strings cannot be an array index).
|
|
if (length > kMaxMediumStringSize) return HashField(length, false);
|
|
|
|
// Note: the Jenkins one-at-a-time hash function
|
|
uint32_t hash = 0;
|
|
while (buffer->has_more()) {
|
|
uc32 r = buffer->GetNext();
|
|
hash += r;
|
|
hash += (hash << 10);
|
|
hash ^= (hash >> 6);
|
|
}
|
|
hash += (hash << 3);
|
|
hash ^= (hash >> 11);
|
|
hash += (hash << 15);
|
|
|
|
// Short string.
|
|
if (length <= kMaxShortStringSize) {
|
|
// Make hash value consistent with value returned from String::Hash.
|
|
buffer->Rewind();
|
|
uint32_t index;
|
|
hash = HashField(hash, ComputeArrayIndex(buffer, &index, length));
|
|
hash = (hash & 0x00FFFFFF) | (length << kShortLengthShift);
|
|
return hash;
|
|
}
|
|
|
|
// Medium string (please note medium strings cannot be an array index).
|
|
ASSERT(length <= kMaxMediumStringSize);
|
|
// Make hash value consistent with value returned from String::Hash.
|
|
hash = HashField(hash, false);
|
|
hash = (hash & 0x0000FFFF) | (length << kMediumLengthShift);
|
|
return hash;
|
|
}
|
|
|
|
|
|
Object* String::Slice(int start, int end) {
|
|
if (start == 0 && end == length()) return this;
|
|
int representation = representation_tag();
|
|
if (representation == kSlicedStringTag) {
|
|
// Translate slices of a SlicedString into slices of the
|
|
// underlying string buffer.
|
|
SlicedString* str = SlicedString::cast(this);
|
|
return Heap::AllocateSlicedString(String::cast(str->buffer()),
|
|
str->start() + start,
|
|
str->start() + end);
|
|
}
|
|
Object* answer = Heap::AllocateSlicedString(this, start, end);
|
|
if (answer->IsFailure()) {
|
|
return answer;
|
|
}
|
|
// Due to the way we retry after GC on allocation failure we are not allowed
|
|
// to fail on allocation after this point. This is the one-allocation rule.
|
|
|
|
// Try to flatten a cons string that is under the sliced string.
|
|
// This is to avoid memory leaks and possible stack overflows caused by
|
|
// building 'towers' of sliced strings on cons strings.
|
|
// This may fail due to an allocation failure (when a GC is needed), but it
|
|
// will succeed often enough to avoid the problem. We only have to do this
|
|
// if Heap::AllocateSlicedString actually returned a SlicedString. It will
|
|
// return flat strings for small slices for efficiency reasons.
|
|
if (String::cast(answer)->StringIsSlicedString() &&
|
|
representation == kConsStringTag) {
|
|
TryFlatten();
|
|
// If the flatten succeeded we might as well make the sliced string point
|
|
// to the flat string rather than the cons string.
|
|
if (String::cast(ConsString::cast(this)->second())->length() == 0) {
|
|
SlicedString::cast(answer)->set_buffer(ConsString::cast(this)->first());
|
|
}
|
|
}
|
|
return answer;
|
|
}
|
|
|
|
|
|
void String::PrintOn(FILE* file) {
|
|
int length = this->length();
|
|
for (int i = 0; i < length; i++) {
|
|
fprintf(file, "%c", Get(i));
|
|
}
|
|
}
|
|
|
|
|
|
void Map::MapIterateBody(ObjectVisitor* v) {
|
|
// Assumes all Object* members are contiguously allocated!
|
|
IteratePointers(v, kPrototypeOffset, kCodeCacheOffset + kPointerSize);
|
|
}
|
|
|
|
|
|
int JSFunction::NumberOfLiterals() {
|
|
return literals()->length();
|
|
}
|
|
|
|
|
|
Object* JSFunction::SetInstancePrototype(Object* value) {
|
|
ASSERT(value->IsJSObject());
|
|
|
|
if (has_initial_map()) {
|
|
initial_map()->set_prototype(value);
|
|
} else {
|
|
// Put the value in the initial map field until an initial map is
|
|
// needed. At that point, a new initial map is created and the
|
|
// prototype is put into the initial map where it belongs.
|
|
set_prototype_or_initial_map(value);
|
|
}
|
|
return value;
|
|
}
|
|
|
|
|
|
|
|
Object* JSFunction::SetPrototype(Object* value) {
|
|
Object* construct_prototype = value;
|
|
|
|
// If the value is not a JSObject, store the value in the map's
|
|
// constructor field so it can be accessed. Also, set the prototype
|
|
// used for constructing objects to the original object prototype.
|
|
// See ECMA-262 13.2.2.
|
|
if (!value->IsJSObject()) {
|
|
// Copy the map so this does not affect unrelated functions.
|
|
// Remove map transitions because they point to maps with a
|
|
// different prototype.
|
|
Object* new_map = map()->CopyDropTransitions();
|
|
if (new_map->IsFailure()) return new_map;
|
|
set_map(Map::cast(new_map));
|
|
map()->set_constructor(value);
|
|
map()->set_non_instance_prototype(true);
|
|
construct_prototype =
|
|
Top::context()->global_context()->initial_object_prototype();
|
|
} else {
|
|
map()->set_non_instance_prototype(false);
|
|
}
|
|
|
|
return SetInstancePrototype(construct_prototype);
|
|
}
|
|
|
|
|
|
Object* JSFunction::SetInstanceClassName(String* name) {
|
|
shared()->set_instance_class_name(name);
|
|
return this;
|
|
}
|
|
|
|
|
|
Context* JSFunction::GlobalContextFromLiterals(FixedArray* literals) {
|
|
return Context::cast(literals->get(JSFunction::kLiteralGlobalContextIndex));
|
|
}
|
|
|
|
|
|
void Oddball::OddballIterateBody(ObjectVisitor* v) {
|
|
// Assumes all Object* members are contiguously allocated!
|
|
IteratePointers(v, kToStringOffset, kToNumberOffset + kPointerSize);
|
|
}
|
|
|
|
|
|
Object* Oddball::Initialize(const char* to_string, Object* to_number) {
|
|
Object* symbol = Heap::LookupAsciiSymbol(to_string);
|
|
if (symbol->IsFailure()) return symbol;
|
|
set_to_string(String::cast(symbol));
|
|
set_to_number(to_number);
|
|
return this;
|
|
}
|
|
|
|
|
|
bool SharedFunctionInfo::HasSourceCode() {
|
|
return !script()->IsUndefined() &&
|
|
!Script::cast(script())->source()->IsUndefined();
|
|
}
|
|
|
|
|
|
Object* SharedFunctionInfo::GetSourceCode() {
|
|
HandleScope scope;
|
|
if (script()->IsUndefined()) return Heap::undefined_value();
|
|
Object* source = Script::cast(script())->source();
|
|
if (source->IsUndefined()) return Heap::undefined_value();
|
|
return *SubString(Handle<String>(String::cast(source)),
|
|
start_position(), end_position());
|
|
}
|
|
|
|
|
|
// Support function for printing the source code to a StringStream
|
|
// without any allocation in the heap.
|
|
void SharedFunctionInfo::SourceCodePrint(StringStream* accumulator,
|
|
int max_length) {
|
|
// For some native functions there is no source.
|
|
if (script()->IsUndefined() ||
|
|
Script::cast(script())->source()->IsUndefined()) {
|
|
accumulator->Add("<No Source>");
|
|
return;
|
|
}
|
|
|
|
// Get the slice of the source for this function.
|
|
// Don't use String::cast because we don't want more assertion errors while
|
|
// we are already creating a stack dump.
|
|
String* script_source =
|
|
reinterpret_cast<String*>(Script::cast(script())->source());
|
|
|
|
if (!script_source->LooksValid()) {
|
|
accumulator->Add("<Invalid Source>");
|
|
return;
|
|
}
|
|
|
|
if (!is_toplevel()) {
|
|
accumulator->Add("function ");
|
|
Object* name = this->name();
|
|
if (name->IsString() && String::cast(name)->length() > 0) {
|
|
accumulator->PrintName(name);
|
|
}
|
|
}
|
|
|
|
int len = end_position() - start_position();
|
|
if (len > max_length) {
|
|
accumulator->Put(script_source,
|
|
start_position(),
|
|
start_position() + max_length);
|
|
accumulator->Add("...\n");
|
|
} else {
|
|
accumulator->Put(script_source, start_position(), end_position());
|
|
}
|
|
}
|
|
|
|
|
|
void SharedFunctionInfo::SharedFunctionInfoIterateBody(ObjectVisitor* v) {
|
|
IteratePointers(v, kNameOffset, kCodeOffset + kPointerSize);
|
|
IteratePointers(v, kInstanceClassNameOffset, kScriptOffset + kPointerSize);
|
|
IteratePointer(v, kDebugInfoOffset);
|
|
}
|
|
|
|
|
|
void ObjectVisitor::BeginCodeIteration(Code* code) {
|
|
ASSERT(code->ic_flag() == Code::IC_TARGET_IS_OBJECT);
|
|
}
|
|
|
|
|
|
void ObjectVisitor::VisitCodeTarget(RelocInfo* rinfo) {
|
|
ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode()));
|
|
VisitPointer(rinfo->target_object_address());
|
|
}
|
|
|
|
|
|
void ObjectVisitor::VisitDebugTarget(RelocInfo* rinfo) {
|
|
ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()) && rinfo->is_call_instruction());
|
|
VisitPointer(rinfo->call_object_address());
|
|
}
|
|
|
|
|
|
// Convert relocatable targets from address to code object address. This is
|
|
// mainly IC call targets but for debugging straight-line code can be replaced
|
|
// with a call instruction which also has to be relocated.
|
|
void Code::ConvertICTargetsFromAddressToObject() {
|
|
ASSERT(ic_flag() == IC_TARGET_IS_ADDRESS);
|
|
|
|
for (RelocIterator it(this, RelocInfo::kCodeTargetMask);
|
|
!it.done(); it.next()) {
|
|
Address ic_addr = it.rinfo()->target_address();
|
|
ASSERT(ic_addr != NULL);
|
|
HeapObject* code = HeapObject::FromAddress(ic_addr - Code::kHeaderSize);
|
|
ASSERT(code->IsHeapObject());
|
|
it.rinfo()->set_target_object(code);
|
|
}
|
|
|
|
if (Debug::has_break_points()) {
|
|
for (RelocIterator it(this, RelocInfo::ModeMask(RelocInfo::JS_RETURN));
|
|
!it.done();
|
|
it.next()) {
|
|
if (it.rinfo()->is_call_instruction()) {
|
|
Address addr = it.rinfo()->call_address();
|
|
ASSERT(addr != NULL);
|
|
HeapObject* code = HeapObject::FromAddress(addr - Code::kHeaderSize);
|
|
ASSERT(code->IsHeapObject());
|
|
it.rinfo()->set_call_object(code);
|
|
}
|
|
}
|
|
}
|
|
set_ic_flag(IC_TARGET_IS_OBJECT);
|
|
}
|
|
|
|
|
|
void Code::CodeIterateBody(ObjectVisitor* v) {
|
|
v->BeginCodeIteration(this);
|
|
|
|
int mode_mask = RelocInfo::kCodeTargetMask |
|
|
RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
|
|
RelocInfo::ModeMask(RelocInfo::EXTERNAL_REFERENCE) |
|
|
RelocInfo::ModeMask(RelocInfo::JS_RETURN) |
|
|
RelocInfo::ModeMask(RelocInfo::RUNTIME_ENTRY);
|
|
|
|
for (RelocIterator it(this, mode_mask); !it.done(); it.next()) {
|
|
RelocInfo::Mode rmode = it.rinfo()->rmode();
|
|
if (rmode == RelocInfo::EMBEDDED_OBJECT) {
|
|
v->VisitPointer(it.rinfo()->target_object_address());
|
|
} else if (RelocInfo::IsCodeTarget(rmode)) {
|
|
v->VisitCodeTarget(it.rinfo());
|
|
} else if (rmode == RelocInfo::EXTERNAL_REFERENCE) {
|
|
v->VisitExternalReference(it.rinfo()->target_reference_address());
|
|
} else if (Debug::has_break_points() &&
|
|
RelocInfo::IsJSReturn(rmode) &&
|
|
it.rinfo()->is_call_instruction()) {
|
|
v->VisitDebugTarget(it.rinfo());
|
|
} else if (rmode == RelocInfo::RUNTIME_ENTRY) {
|
|
v->VisitRuntimeEntry(it.rinfo());
|
|
}
|
|
}
|
|
|
|
ScopeInfo<>::IterateScopeInfo(this, v);
|
|
|
|
v->EndCodeIteration(this);
|
|
}
|
|
|
|
|
|
void Code::ConvertICTargetsFromObjectToAddress() {
|
|
ASSERT(ic_flag() == IC_TARGET_IS_OBJECT);
|
|
|
|
for (RelocIterator it(this, RelocInfo::kCodeTargetMask);
|
|
!it.done(); it.next()) {
|
|
// We cannot use the safe cast (Code::cast) here, because we may be in
|
|
// the middle of relocating old objects during GC and the map pointer in
|
|
// the code object may be mangled
|
|
Code* code = reinterpret_cast<Code*>(it.rinfo()->target_object());
|
|
ASSERT((code != NULL) && code->IsHeapObject());
|
|
it.rinfo()->set_target_address(code->instruction_start());
|
|
}
|
|
|
|
if (Debug::has_break_points()) {
|
|
for (RelocIterator it(this, RelocInfo::ModeMask(RelocInfo::JS_RETURN));
|
|
!it.done();
|
|
it.next()) {
|
|
if (it.rinfo()->is_call_instruction()) {
|
|
Code* code = reinterpret_cast<Code*>(it.rinfo()->call_object());
|
|
ASSERT((code != NULL) && code->IsHeapObject());
|
|
it.rinfo()->set_call_address(code->instruction_start());
|
|
}
|
|
}
|
|
}
|
|
set_ic_flag(IC_TARGET_IS_ADDRESS);
|
|
}
|
|
|
|
|
|
void Code::Relocate(int delta) {
|
|
for (RelocIterator it(this, RelocInfo::kApplyMask); !it.done(); it.next()) {
|
|
it.rinfo()->apply(delta);
|
|
}
|
|
CPU::FlushICache(instruction_start(), instruction_size());
|
|
}
|
|
|
|
|
|
void Code::CopyFrom(const CodeDesc& desc) {
|
|
// copy code
|
|
memmove(instruction_start(), desc.buffer, desc.instr_size);
|
|
|
|
// fill gap with zero bytes
|
|
{ byte* p = instruction_start() + desc.instr_size;
|
|
byte* q = relocation_start();
|
|
while (p < q) {
|
|
*p++ = 0;
|
|
}
|
|
}
|
|
|
|
// copy reloc info
|
|
memmove(relocation_start(),
|
|
desc.buffer + desc.buffer_size - desc.reloc_size,
|
|
desc.reloc_size);
|
|
|
|
// unbox handles and relocate
|
|
int delta = instruction_start() - desc.buffer;
|
|
int mode_mask = RelocInfo::kCodeTargetMask |
|
|
RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
|
|
RelocInfo::kApplyMask;
|
|
for (RelocIterator it(this, mode_mask); !it.done(); it.next()) {
|
|
RelocInfo::Mode mode = it.rinfo()->rmode();
|
|
if (mode == RelocInfo::EMBEDDED_OBJECT) {
|
|
Object** p = reinterpret_cast<Object**>(it.rinfo()->target_object());
|
|
it.rinfo()->set_target_object(*p);
|
|
} else if (RelocInfo::IsCodeTarget(mode)) {
|
|
// rewrite code handles in inline cache targets to direct
|
|
// pointers to the first instruction in the code object
|
|
Object** p = reinterpret_cast<Object**>(it.rinfo()->target_object());
|
|
Code* code = Code::cast(*p);
|
|
it.rinfo()->set_target_address(code->instruction_start());
|
|
} else {
|
|
it.rinfo()->apply(delta);
|
|
}
|
|
}
|
|
CPU::FlushICache(instruction_start(), instruction_size());
|
|
}
|
|
|
|
|
|
// Locate the source position which is closest to the address in the code. This
|
|
// is using the source position information embedded in the relocation info.
|
|
// The position returned is relative to the beginning of the script where the
|
|
// source for this function is found.
|
|
int Code::SourcePosition(Address pc) {
|
|
int distance = kMaxInt;
|
|
int position = RelocInfo::kNoPosition; // Initially no position found.
|
|
// Run through all the relocation info to find the best matching source
|
|
// position. All the code needs to be considered as the sequence of the
|
|
// instructions in the code does not necessarily follow the same order as the
|
|
// source.
|
|
RelocIterator it(this, RelocInfo::kPositionMask);
|
|
while (!it.done()) {
|
|
// Only look at positions after the current pc.
|
|
if (it.rinfo()->pc() < pc) {
|
|
// Get position and distance.
|
|
int dist = pc - it.rinfo()->pc();
|
|
int pos = it.rinfo()->data();
|
|
// If this position is closer than the current candidate or if it has the
|
|
// same distance as the current candidate and the position is higher then
|
|
// this position is the new candidate.
|
|
if ((dist < distance) ||
|
|
(dist == distance && pos > position)) {
|
|
position = pos;
|
|
distance = dist;
|
|
}
|
|
}
|
|
it.next();
|
|
}
|
|
return position;
|
|
}
|
|
|
|
|
|
// Same as Code::SourcePosition above except it only looks for statement
|
|
// positions.
|
|
int Code::SourceStatementPosition(Address pc) {
|
|
// First find the position as close as possible using all position
|
|
// information.
|
|
int position = SourcePosition(pc);
|
|
// Now find the closest statement position before the position.
|
|
int statement_position = 0;
|
|
RelocIterator it(this, RelocInfo::kPositionMask);
|
|
while (!it.done()) {
|
|
if (RelocInfo::IsStatementPosition(it.rinfo()->rmode())) {
|
|
int p = it.rinfo()->data();
|
|
if (statement_position < p && p <= position) {
|
|
statement_position = p;
|
|
}
|
|
}
|
|
it.next();
|
|
}
|
|
return statement_position;
|
|
}
|
|
|
|
|
|
#ifdef ENABLE_DISASSEMBLER
|
|
// Identify kind of code.
|
|
const char* Code::Kind2String(Kind kind) {
|
|
switch (kind) {
|
|
case FUNCTION: return "FUNCTION";
|
|
case STUB: return "STUB";
|
|
case BUILTIN: return "BUILTIN";
|
|
case LOAD_IC: return "LOAD_IC";
|
|
case KEYED_LOAD_IC: return "KEYED_LOAD_IC";
|
|
case STORE_IC: return "STORE_IC";
|
|
case KEYED_STORE_IC: return "KEYED_STORE_IC";
|
|
case CALL_IC: return "CALL_IC";
|
|
}
|
|
UNREACHABLE();
|
|
return NULL;
|
|
}
|
|
|
|
|
|
const char* Code::ICState2String(InlineCacheState state) {
|
|
switch (state) {
|
|
case UNINITIALIZED: return "UNINITIALIZED";
|
|
case PREMONOMORPHIC: return "PREMONOMORPHIC";
|
|
case MONOMORPHIC: return "MONOMORPHIC";
|
|
case MONOMORPHIC_PROTOTYPE_FAILURE: return "MONOMORPHIC_PROTOTYPE_FAILURE";
|
|
case MEGAMORPHIC: return "MEGAMORPHIC";
|
|
case DEBUG_BREAK: return "DEBUG_BREAK";
|
|
case DEBUG_PREPARE_STEP_IN: return "DEBUG_PREPARE_STEP_IN";
|
|
}
|
|
UNREACHABLE();
|
|
return NULL;
|
|
}
|
|
|
|
|
|
void Code::Disassemble() {
|
|
PrintF("kind = %s", Kind2String(kind()));
|
|
|
|
PrintF("\nInstructions (size = %d)\n", instruction_size());
|
|
Disassembler::Decode(NULL, this);
|
|
PrintF("\n");
|
|
|
|
PrintF("RelocInfo (size = %d)\n", relocation_size());
|
|
for (RelocIterator it(this); !it.done(); it.next())
|
|
it.rinfo()->Print();
|
|
PrintF("\n");
|
|
}
|
|
#endif // ENABLE_DISASSEMBLER
|
|
|
|
|
|
void JSObject::SetFastElements(FixedArray* elems) {
|
|
#ifdef DEBUG
|
|
// Check the provided array is filled with the_hole.
|
|
uint32_t len = static_cast<uint32_t>(elems->length());
|
|
for (uint32_t i = 0; i < len; i++) ASSERT(elems->get(i)->IsTheHole());
|
|
#endif
|
|
FixedArray::WriteBarrierMode mode = elems->GetWriteBarrierMode();
|
|
if (HasFastElements()) {
|
|
FixedArray* old_elements = FixedArray::cast(elements());
|
|
uint32_t old_length = static_cast<uint32_t>(old_elements->length());
|
|
// Fill out the new array with this content and array holes.
|
|
for (uint32_t i = 0; i < old_length; i++) {
|
|
elems->set(i, old_elements->get(i), mode);
|
|
}
|
|
} else {
|
|
Dictionary* dictionary = Dictionary::cast(elements());
|
|
for (int i = 0; i < dictionary->Capacity(); i++) {
|
|
Object* key = dictionary->KeyAt(i);
|
|
if (key->IsNumber()) {
|
|
uint32_t entry = static_cast<uint32_t>(key->Number());
|
|
elems->set(entry, dictionary->ValueAt(i), mode);
|
|
}
|
|
}
|
|
}
|
|
set_elements(elems);
|
|
}
|
|
|
|
|
|
Object* JSObject::SetSlowElements(Object* len) {
|
|
uint32_t new_length = static_cast<uint32_t>(len->Number());
|
|
|
|
if (!HasFastElements()) {
|
|
if (IsJSArray()) {
|
|
uint32_t old_length =
|
|
static_cast<uint32_t>(JSArray::cast(this)->length()->Number());
|
|
element_dictionary()->RemoveNumberEntries(new_length, old_length),
|
|
JSArray::cast(this)->set_length(len);
|
|
}
|
|
return this;
|
|
}
|
|
|
|
// Make sure we never try to shrink dense arrays into sparse arrays.
|
|
ASSERT(static_cast<uint32_t>(FixedArray::cast(elements())->length()) <=
|
|
new_length);
|
|
Object* obj = NormalizeElements();
|
|
if (obj->IsFailure()) return obj;
|
|
|
|
// Update length for JSArrays.
|
|
if (IsJSArray()) JSArray::cast(this)->set_length(len);
|
|
return this;
|
|
}
|
|
|
|
|
|
Object* JSArray::Initialize(int capacity) {
|
|
ASSERT(capacity >= 0);
|
|
set_length(Smi::FromInt(0));
|
|
FixedArray* new_elements;
|
|
if (capacity == 0) {
|
|
new_elements = Heap::empty_fixed_array();
|
|
} else {
|
|
Object* obj = Heap::AllocateFixedArrayWithHoles(capacity);
|
|
if (obj->IsFailure()) return obj;
|
|
new_elements = FixedArray::cast(obj);
|
|
}
|
|
set_elements(new_elements);
|
|
return this;
|
|
}
|
|
|
|
|
|
void JSArray::SetContent(FixedArray* storage) {
|
|
set_length(Smi::FromInt(storage->length()));
|
|
set_elements(storage);
|
|
}
|
|
|
|
|
|
// Computes the new capacity when expanding the elements of a JSObject.
|
|
static int NewElementsCapacity(int old_capacity) {
|
|
// (old_capacity + 50%) + 16
|
|
return old_capacity + (old_capacity >> 1) + 16;
|
|
}
|
|
|
|
|
|
static Object* ArrayLengthRangeError() {
|
|
HandleScope scope;
|
|
return Top::Throw(*Factory::NewRangeError("invalid_array_length",
|
|
HandleVector<Object>(NULL, 0)));
|
|
}
|
|
|
|
|
|
Object* JSObject::SetElementsLength(Object* len) {
|
|
Object* smi_length = len->ToSmi();
|
|
if (smi_length->IsSmi()) {
|
|
int value = Smi::cast(smi_length)->value();
|
|
if (value < 0) return ArrayLengthRangeError();
|
|
if (HasFastElements()) {
|
|
int old_capacity = FixedArray::cast(elements())->length();
|
|
if (value <= old_capacity) {
|
|
if (IsJSArray()) {
|
|
int old_length = FastD2I(JSArray::cast(this)->length()->Number());
|
|
// NOTE: We may be able to optimize this by removing the
|
|
// last part of the elements backing storage array and
|
|
// setting the capacity to the new size.
|
|
for (int i = value; i < old_length; i++) {
|
|
FixedArray::cast(elements())->set_the_hole(i);
|
|
}
|
|
JSArray::cast(this)->set_length(smi_length);
|
|
}
|
|
return this;
|
|
}
|
|
int min = NewElementsCapacity(old_capacity);
|
|
int new_capacity = value > min ? value : min;
|
|
if (new_capacity <= kMaxFastElementsLength ||
|
|
!ShouldConvertToSlowElements(new_capacity)) {
|
|
Object* obj = Heap::AllocateFixedArrayWithHoles(new_capacity);
|
|
if (obj->IsFailure()) return obj;
|
|
if (IsJSArray()) JSArray::cast(this)->set_length(smi_length);
|
|
SetFastElements(FixedArray::cast(obj));
|
|
return this;
|
|
}
|
|
} else {
|
|
if (IsJSArray()) {
|
|
if (value == 0) {
|
|
// If the length of a slow array is reset to zero, we clear
|
|
// the array and flush backing storage. This has the added
|
|
// benefit that the array returns to fast mode.
|
|
initialize_elements();
|
|
} else {
|
|
// Remove deleted elements.
|
|
uint32_t old_length =
|
|
static_cast<uint32_t>(JSArray::cast(this)->length()->Number());
|
|
element_dictionary()->RemoveNumberEntries(value, old_length);
|
|
}
|
|
JSArray::cast(this)->set_length(smi_length);
|
|
}
|
|
return this;
|
|
}
|
|
}
|
|
|
|
// General slow case.
|
|
if (len->IsNumber()) {
|
|
uint32_t length;
|
|
if (Array::IndexFromObject(len, &length)) {
|
|
return SetSlowElements(len);
|
|
} else {
|
|
return ArrayLengthRangeError();
|
|
}
|
|
}
|
|
|
|
// len is not a number so make the array size one and
|
|
// set only element to len.
|
|
Object* obj = Heap::AllocateFixedArray(1);
|
|
if (obj->IsFailure()) return obj;
|
|
FixedArray::cast(obj)->set(0, len);
|
|
if (IsJSArray()) JSArray::cast(this)->set_length(Smi::FromInt(1));
|
|
set_elements(FixedArray::cast(obj));
|
|
return this;
|
|
}
|
|
|
|
|
|
bool JSObject::HasElementPostInterceptor(JSObject* receiver, uint32_t index) {
|
|
if (HasFastElements()) {
|
|
uint32_t length = IsJSArray() ?
|
|
static_cast<uint32_t>(
|
|
Smi::cast(JSArray::cast(this)->length())->value()) :
|
|
static_cast<uint32_t>(FixedArray::cast(elements())->length());
|
|
if ((index < length) &&
|
|
!FixedArray::cast(elements())->get(index)->IsTheHole()) {
|
|
return true;
|
|
}
|
|
} else {
|
|
if (element_dictionary()->FindNumberEntry(index) != -1) return true;
|
|
}
|
|
|
|
// Handle [] on String objects.
|
|
if (this->IsStringObjectWithCharacterAt(index)) return true;
|
|
|
|
Object* pt = GetPrototype();
|
|
if (pt == Heap::null_value()) return false;
|
|
return JSObject::cast(pt)->HasElementWithReceiver(receiver, index);
|
|
}
|
|
|
|
|
|
bool JSObject::HasElementWithInterceptor(JSObject* receiver, uint32_t index) {
|
|
// Make sure that the top context does not change when doing
|
|
// callbacks or interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
HandleScope scope;
|
|
Handle<InterceptorInfo> interceptor(GetIndexedInterceptor());
|
|
Handle<JSObject> receiver_handle(receiver);
|
|
Handle<JSObject> holder_handle(this);
|
|
Handle<Object> data_handle(interceptor->data());
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(receiver_handle),
|
|
v8::Utils::ToLocal(data_handle),
|
|
v8::Utils::ToLocal(holder_handle));
|
|
if (!interceptor->query()->IsUndefined()) {
|
|
v8::IndexedPropertyQuery query =
|
|
v8::ToCData<v8::IndexedPropertyQuery>(interceptor->query());
|
|
LOG(ApiIndexedPropertyAccess("interceptor-indexed-has", this, index));
|
|
v8::Handle<v8::Boolean> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = query(index, info);
|
|
}
|
|
if (!result.IsEmpty()) return result->IsTrue();
|
|
} else if (!interceptor->getter()->IsUndefined()) {
|
|
v8::IndexedPropertyGetter getter =
|
|
v8::ToCData<v8::IndexedPropertyGetter>(interceptor->getter());
|
|
LOG(ApiIndexedPropertyAccess("interceptor-indexed-has-get", this, index));
|
|
v8::Handle<v8::Value> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = getter(index, info);
|
|
}
|
|
if (!result.IsEmpty()) return !result->IsUndefined();
|
|
}
|
|
return holder_handle->HasElementPostInterceptor(*receiver_handle, index);
|
|
}
|
|
|
|
|
|
bool JSObject::HasLocalElement(uint32_t index) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayIndexedAccess(this, index, v8::ACCESS_HAS)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_HAS);
|
|
return false;
|
|
}
|
|
|
|
// Check for lookup interceptor
|
|
if (HasIndexedInterceptor()) {
|
|
return HasElementWithInterceptor(this, index);
|
|
}
|
|
|
|
// Handle [] on String objects.
|
|
if (this->IsStringObjectWithCharacterAt(index)) return true;
|
|
|
|
if (HasFastElements()) {
|
|
uint32_t length = IsJSArray() ?
|
|
static_cast<uint32_t>(
|
|
Smi::cast(JSArray::cast(this)->length())->value()) :
|
|
static_cast<uint32_t>(FixedArray::cast(elements())->length());
|
|
return (index < length) &&
|
|
!FixedArray::cast(elements())->get(index)->IsTheHole();
|
|
} else {
|
|
return element_dictionary()->FindNumberEntry(index) != -1;
|
|
}
|
|
}
|
|
|
|
|
|
bool JSObject::HasElementWithReceiver(JSObject* receiver, uint32_t index) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayIndexedAccess(this, index, v8::ACCESS_HAS)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_HAS);
|
|
return false;
|
|
}
|
|
|
|
// Check for lookup interceptor
|
|
if (HasIndexedInterceptor()) {
|
|
return HasElementWithInterceptor(receiver, index);
|
|
}
|
|
|
|
if (HasFastElements()) {
|
|
uint32_t length = IsJSArray() ?
|
|
static_cast<uint32_t>(
|
|
Smi::cast(JSArray::cast(this)->length())->value()) :
|
|
static_cast<uint32_t>(FixedArray::cast(elements())->length());
|
|
if ((index < length) &&
|
|
!FixedArray::cast(elements())->get(index)->IsTheHole()) return true;
|
|
} else {
|
|
if (element_dictionary()->FindNumberEntry(index) != -1) return true;
|
|
}
|
|
|
|
// Handle [] on String objects.
|
|
if (this->IsStringObjectWithCharacterAt(index)) return true;
|
|
|
|
Object* pt = GetPrototype();
|
|
if (pt == Heap::null_value()) return false;
|
|
return JSObject::cast(pt)->HasElementWithReceiver(receiver, index);
|
|
}
|
|
|
|
|
|
Object* JSObject::SetElementPostInterceptor(uint32_t index, Object* value) {
|
|
if (HasFastElements()) return SetFastElement(index, value);
|
|
|
|
// Dictionary case.
|
|
ASSERT(!HasFastElements());
|
|
|
|
FixedArray* elms = FixedArray::cast(elements());
|
|
Object* result = Dictionary::cast(elms)->AtNumberPut(index, value);
|
|
if (result->IsFailure()) return result;
|
|
if (elms != FixedArray::cast(result)) {
|
|
set_elements(FixedArray::cast(result));
|
|
}
|
|
|
|
if (IsJSArray()) {
|
|
return JSArray::cast(this)->JSArrayUpdateLengthFromIndex(index, value);
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
|
|
Object* JSObject::SetElementWithInterceptor(uint32_t index, Object* value) {
|
|
// Make sure that the top context does not change when doing
|
|
// callbacks or interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
HandleScope scope;
|
|
Handle<InterceptorInfo> interceptor(GetIndexedInterceptor());
|
|
Handle<JSObject> this_handle(this);
|
|
Handle<Object> value_handle(value);
|
|
if (!interceptor->setter()->IsUndefined()) {
|
|
v8::IndexedPropertySetter setter =
|
|
v8::ToCData<v8::IndexedPropertySetter>(interceptor->setter());
|
|
Handle<Object> data_handle(interceptor->data());
|
|
LOG(ApiIndexedPropertyAccess("interceptor-indexed-set", this, index));
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(this_handle),
|
|
v8::Utils::ToLocal(data_handle),
|
|
v8::Utils::ToLocal(this_handle));
|
|
v8::Handle<v8::Value> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = setter(index, v8::Utils::ToLocal(value_handle), info);
|
|
}
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
if (!result.IsEmpty()) return *value_handle;
|
|
}
|
|
Object* raw_result =
|
|
this_handle->SetElementPostInterceptor(index, *value_handle);
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
return raw_result;
|
|
}
|
|
|
|
|
|
// Adding n elements in fast case is O(n*n).
|
|
// Note: revisit design to have dual undefined values to capture absent
|
|
// elements.
|
|
Object* JSObject::SetFastElement(uint32_t index, Object* value) {
|
|
ASSERT(HasFastElements());
|
|
|
|
FixedArray* elms = FixedArray::cast(elements());
|
|
uint32_t elms_length = static_cast<uint32_t>(elms->length());
|
|
|
|
// Check whether there is extra space in fixed array..
|
|
if (index < elms_length) {
|
|
elms->set(index, value);
|
|
if (IsJSArray()) {
|
|
// Update the length of the array if needed.
|
|
uint32_t array_length = 0;
|
|
CHECK(Array::IndexFromObject(JSArray::cast(this)->length(),
|
|
&array_length));
|
|
if (index >= array_length) {
|
|
JSArray::cast(this)->set_length(Smi::FromInt(index + 1));
|
|
}
|
|
}
|
|
return this;
|
|
}
|
|
|
|
// Allow gap in fast case.
|
|
if ((index - elms_length) < kMaxGap) {
|
|
// Try allocating extra space.
|
|
int new_capacity = NewElementsCapacity(index+1);
|
|
if (new_capacity <= kMaxFastElementsLength ||
|
|
!ShouldConvertToSlowElements(new_capacity)) {
|
|
ASSERT(static_cast<uint32_t>(new_capacity) > index);
|
|
Object* obj = Heap::AllocateFixedArrayWithHoles(new_capacity);
|
|
if (obj->IsFailure()) return obj;
|
|
SetFastElements(FixedArray::cast(obj));
|
|
if (IsJSArray()) JSArray::cast(this)->set_length(Smi::FromInt(index + 1));
|
|
FixedArray::cast(elements())->set(index, value);
|
|
return this;
|
|
}
|
|
}
|
|
|
|
// Otherwise default to slow case.
|
|
Object* obj = NormalizeElements();
|
|
if (obj->IsFailure()) return obj;
|
|
ASSERT(!HasFastElements());
|
|
return SetElement(index, value);
|
|
}
|
|
|
|
|
|
Object* JSObject::SetElement(uint32_t index, Object* value) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayIndexedAccess(this, index, v8::ACCESS_SET)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_SET);
|
|
return value;
|
|
}
|
|
|
|
// Check for lookup interceptor
|
|
if (HasIndexedInterceptor()) {
|
|
return SetElementWithInterceptor(index, value);
|
|
}
|
|
|
|
// Fast case.
|
|
if (HasFastElements()) return SetFastElement(index, value);
|
|
|
|
// Dictionary case.
|
|
ASSERT(!HasFastElements());
|
|
|
|
// Insert element in the dictionary.
|
|
FixedArray* elms = FixedArray::cast(elements());
|
|
Dictionary* dictionary = Dictionary::cast(elms);
|
|
Object* result = dictionary->AtNumberPut(index, value);
|
|
if (result->IsFailure()) return result;
|
|
if (elms != FixedArray::cast(result)) {
|
|
set_elements(FixedArray::cast(result));
|
|
}
|
|
|
|
// Update the array length if this JSObject is an array.
|
|
if (IsJSArray()) {
|
|
JSArray* array = JSArray::cast(this);
|
|
Object* return_value = array->JSArrayUpdateLengthFromIndex(index, value);
|
|
if (return_value->IsFailure()) return return_value;
|
|
}
|
|
|
|
// Attempt to put this object back in fast case.
|
|
if (ShouldConvertToFastElements()) {
|
|
uint32_t new_length = 0;
|
|
if (IsJSArray()) {
|
|
CHECK(Array::IndexFromObject(JSArray::cast(this)->length(), &new_length));
|
|
} else {
|
|
new_length = Dictionary::cast(elements())->max_number_key() + 1;
|
|
}
|
|
Object* obj = Heap::AllocateFixedArrayWithHoles(new_length);
|
|
if (obj->IsFailure()) return obj;
|
|
SetFastElements(FixedArray::cast(obj));
|
|
#ifdef DEBUG
|
|
if (FLAG_trace_normalization) {
|
|
PrintF("Object elements are fast case again:\n");
|
|
Print();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
|
|
Object* JSArray::JSArrayUpdateLengthFromIndex(uint32_t index, Object* value) {
|
|
uint32_t old_len = 0;
|
|
CHECK(Array::IndexFromObject(length(), &old_len));
|
|
// Check to see if we need to update the length. For now, we make
|
|
// sure that the length stays within 32-bits (unsigned).
|
|
if (index >= old_len && index != 0xffffffff) {
|
|
Object* len =
|
|
Heap::NumberFromDouble(static_cast<double>(index) + 1);
|
|
if (len->IsFailure()) return len;
|
|
set_length(len);
|
|
}
|
|
return value;
|
|
}
|
|
|
|
|
|
Object* JSObject::GetElementPostInterceptor(JSObject* receiver,
|
|
uint32_t index) {
|
|
// Get element works for both JSObject and JSArray since
|
|
// JSArray::length cannot change.
|
|
if (HasFastElements()) {
|
|
FixedArray* elms = FixedArray::cast(elements());
|
|
if (index < static_cast<uint32_t>(elms->length())) {
|
|
Object* value = elms->get(index);
|
|
if (!value->IsTheHole()) return value;
|
|
}
|
|
} else {
|
|
Dictionary* dictionary = element_dictionary();
|
|
int entry = dictionary->FindNumberEntry(index);
|
|
if (entry != -1) {
|
|
return dictionary->ValueAt(entry);
|
|
}
|
|
}
|
|
|
|
// Continue searching via the prototype chain.
|
|
Object* pt = GetPrototype();
|
|
if (pt == Heap::null_value()) return Heap::undefined_value();
|
|
return pt->GetElementWithReceiver(receiver, index);
|
|
}
|
|
|
|
|
|
Object* JSObject::GetElementWithInterceptor(JSObject* receiver,
|
|
uint32_t index) {
|
|
// Make sure that the top context does not change when doing
|
|
// callbacks or interceptor calls.
|
|
AssertNoContextChange ncc;
|
|
HandleScope scope;
|
|
Handle<InterceptorInfo> interceptor(GetIndexedInterceptor());
|
|
Handle<JSObject> this_handle(receiver);
|
|
Handle<JSObject> holder_handle(this);
|
|
|
|
if (!interceptor->getter()->IsUndefined()) {
|
|
Handle<Object> data_handle(interceptor->data());
|
|
v8::IndexedPropertyGetter getter =
|
|
v8::ToCData<v8::IndexedPropertyGetter>(interceptor->getter());
|
|
LOG(ApiIndexedPropertyAccess("interceptor-indexed-get", this, index));
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(this_handle),
|
|
v8::Utils::ToLocal(data_handle),
|
|
v8::Utils::ToLocal(holder_handle));
|
|
v8::Handle<v8::Value> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = getter(index, info);
|
|
}
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
if (!result.IsEmpty()) return *v8::Utils::OpenHandle(*result);
|
|
}
|
|
|
|
Object* raw_result =
|
|
holder_handle->GetElementPostInterceptor(*this_handle, index);
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
return raw_result;
|
|
}
|
|
|
|
|
|
Object* JSObject::GetElementWithReceiver(JSObject* receiver, uint32_t index) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayIndexedAccess(this, index, v8::ACCESS_GET)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_GET);
|
|
return Heap::undefined_value();
|
|
}
|
|
|
|
if (HasIndexedInterceptor()) {
|
|
return GetElementWithInterceptor(receiver, index);
|
|
}
|
|
|
|
// Get element works for both JSObject and JSArray since
|
|
// JSArray::length cannot change.
|
|
if (HasFastElements()) {
|
|
FixedArray* elms = FixedArray::cast(elements());
|
|
if (index < static_cast<uint32_t>(elms->length())) {
|
|
Object* value = elms->get(index);
|
|
if (!value->IsTheHole()) return value;
|
|
}
|
|
} else {
|
|
Dictionary* dictionary = element_dictionary();
|
|
int entry = dictionary->FindNumberEntry(index);
|
|
if (entry != -1) {
|
|
return dictionary->ValueAt(entry);
|
|
}
|
|
}
|
|
|
|
Object* pt = GetPrototype();
|
|
if (pt == Heap::null_value()) return Heap::undefined_value();
|
|
return pt->GetElementWithReceiver(receiver, index);
|
|
}
|
|
|
|
|
|
bool JSObject::HasDenseElements() {
|
|
int capacity = 0;
|
|
int number_of_elements = 0;
|
|
|
|
if (HasFastElements()) {
|
|
FixedArray* elms = FixedArray::cast(elements());
|
|
capacity = elms->length();
|
|
for (int i = 0; i < capacity; i++) {
|
|
if (!elms->get(i)->IsTheHole()) number_of_elements++;
|
|
}
|
|
} else {
|
|
Dictionary* dictionary = Dictionary::cast(elements());
|
|
capacity = dictionary->Capacity();
|
|
number_of_elements = dictionary->NumberOfElements();
|
|
}
|
|
|
|
if (capacity == 0) return true;
|
|
return (number_of_elements > (capacity / 2));
|
|
}
|
|
|
|
|
|
bool JSObject::ShouldConvertToSlowElements(int new_capacity) {
|
|
ASSERT(HasFastElements());
|
|
// Keep the array in fast case if the current backing storage is
|
|
// almost filled and if the new capacity is no more than twice the
|
|
// old capacity.
|
|
int elements_length = FixedArray::cast(elements())->length();
|
|
return !HasDenseElements() || ((new_capacity / 2) > elements_length);
|
|
}
|
|
|
|
|
|
bool JSObject::ShouldConvertToFastElements() {
|
|
ASSERT(!HasFastElements());
|
|
Dictionary* dictionary = Dictionary::cast(elements());
|
|
// If the elements are sparse, we should not go back to fast case.
|
|
if (!HasDenseElements()) return false;
|
|
// If an element has been added at a very high index in the elements
|
|
// dictionary, we cannot go back to fast case.
|
|
if (dictionary->requires_slow_elements()) return false;
|
|
// An object requiring access checks is never allowed to have fast
|
|
// elements. If it had fast elements we would skip security checks.
|
|
if (IsAccessCheckNeeded()) return false;
|
|
// If the dictionary backing storage takes up roughly half as much
|
|
// space as a fast-case backing storage would the array should have
|
|
// fast elements.
|
|
uint32_t length = 0;
|
|
if (IsJSArray()) {
|
|
CHECK(Array::IndexFromObject(JSArray::cast(this)->length(), &length));
|
|
} else {
|
|
length = dictionary->max_number_key();
|
|
}
|
|
return static_cast<uint32_t>(dictionary->Capacity()) >=
|
|
(length / (2 * Dictionary::kElementSize));
|
|
}
|
|
|
|
|
|
Object* Dictionary::RemoveHoles() {
|
|
int capacity = Capacity();
|
|
Object* obj = Allocate(NumberOfElements());
|
|
if (obj->IsFailure()) return obj;
|
|
Dictionary* dict = Dictionary::cast(obj);
|
|
uint32_t pos = 0;
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k)) {
|
|
dict->AddNumberEntry(pos++, ValueAt(i), DetailsAt(i));
|
|
}
|
|
}
|
|
return dict;
|
|
}
|
|
|
|
|
|
void Dictionary::CopyValuesTo(FixedArray* elements) {
|
|
int pos = 0;
|
|
int capacity = Capacity();
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k)) elements->set(pos++, ValueAt(i));
|
|
}
|
|
ASSERT(pos == elements->length());
|
|
}
|
|
|
|
|
|
Object* JSArray::RemoveHoles() {
|
|
if (HasFastElements()) {
|
|
int len = Smi::cast(length())->value();
|
|
int pos = 0;
|
|
FixedArray* elms = FixedArray::cast(elements());
|
|
for (int index = 0; index < len; index++) {
|
|
Object* e = elms->get(index);
|
|
if (!e->IsTheHole()) {
|
|
if (index != pos) elms->set(pos, e);
|
|
pos++;
|
|
}
|
|
}
|
|
set_length(Smi::FromInt(pos));
|
|
for (int index = pos; index < len; index++) {
|
|
elms->set_the_hole(index);
|
|
}
|
|
return this;
|
|
}
|
|
|
|
// Compact the sparse array if possible.
|
|
Dictionary* dict = element_dictionary();
|
|
int length = dict->NumberOfElements();
|
|
|
|
// Try to make this a fast array again.
|
|
if (length <= kMaxFastElementsLength) {
|
|
Object* obj = Heap::AllocateFixedArray(length);
|
|
if (obj->IsFailure()) return obj;
|
|
dict->CopyValuesTo(FixedArray::cast(obj));
|
|
set_length(Smi::FromInt(length));
|
|
set_elements(FixedArray::cast(obj));
|
|
return this;
|
|
}
|
|
|
|
// Make another dictionary with smaller indices.
|
|
Object* obj = dict->RemoveHoles();
|
|
if (obj->IsFailure()) return obj;
|
|
set_length(Smi::FromInt(length));
|
|
set_elements(Dictionary::cast(obj));
|
|
return this;
|
|
}
|
|
|
|
|
|
InterceptorInfo* JSObject::GetNamedInterceptor() {
|
|
ASSERT(map()->has_named_interceptor());
|
|
JSFunction* constructor = JSFunction::cast(map()->constructor());
|
|
Object* template_info = constructor->shared()->function_data();
|
|
Object* result =
|
|
FunctionTemplateInfo::cast(template_info)->named_property_handler();
|
|
return InterceptorInfo::cast(result);
|
|
}
|
|
|
|
|
|
InterceptorInfo* JSObject::GetIndexedInterceptor() {
|
|
ASSERT(map()->has_indexed_interceptor());
|
|
JSFunction* constructor = JSFunction::cast(map()->constructor());
|
|
Object* template_info = constructor->shared()->function_data();
|
|
Object* result =
|
|
FunctionTemplateInfo::cast(template_info)->indexed_property_handler();
|
|
return InterceptorInfo::cast(result);
|
|
}
|
|
|
|
|
|
Object* JSObject::GetPropertyPostInterceptor(JSObject* receiver,
|
|
String* name,
|
|
PropertyAttributes* attributes) {
|
|
// Check local property in holder, ignore interceptor.
|
|
LookupResult result;
|
|
LocalLookupRealNamedProperty(name, &result);
|
|
if (result.IsValid()) return GetProperty(receiver, &result, name, attributes);
|
|
// Continue searching via the prototype chain.
|
|
Object* pt = GetPrototype();
|
|
*attributes = ABSENT;
|
|
if (pt == Heap::null_value()) return Heap::undefined_value();
|
|
return pt->GetPropertyWithReceiver(receiver, name, attributes);
|
|
}
|
|
|
|
|
|
Object* JSObject::GetPropertyWithInterceptor(JSObject* receiver,
|
|
String* name,
|
|
PropertyAttributes* attributes) {
|
|
HandleScope scope;
|
|
Handle<InterceptorInfo> interceptor(GetNamedInterceptor());
|
|
Handle<JSObject> receiver_handle(receiver);
|
|
Handle<JSObject> holder_handle(this);
|
|
Handle<String> name_handle(name);
|
|
Handle<Object> data_handle(interceptor->data());
|
|
|
|
if (!interceptor->getter()->IsUndefined()) {
|
|
v8::NamedPropertyGetter getter =
|
|
v8::ToCData<v8::NamedPropertyGetter>(interceptor->getter());
|
|
LOG(ApiNamedPropertyAccess("interceptor-named-get", *holder_handle, name));
|
|
v8::AccessorInfo info(v8::Utils::ToLocal(receiver_handle),
|
|
v8::Utils::ToLocal(data_handle),
|
|
v8::Utils::ToLocal(holder_handle));
|
|
v8::Handle<v8::Value> result;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(OTHER);
|
|
result = getter(v8::Utils::ToLocal(name_handle), info);
|
|
}
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
if (!result.IsEmpty()) {
|
|
*attributes = NONE;
|
|
return *v8::Utils::OpenHandle(*result);
|
|
}
|
|
}
|
|
|
|
Object* raw_result = holder_handle->GetPropertyPostInterceptor(
|
|
*receiver_handle,
|
|
*name_handle,
|
|
attributes);
|
|
RETURN_IF_SCHEDULED_EXCEPTION();
|
|
return raw_result;
|
|
}
|
|
|
|
|
|
bool JSObject::HasRealNamedProperty(String* key) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayNamedAccess(this, key, v8::ACCESS_HAS)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_HAS);
|
|
return false;
|
|
}
|
|
|
|
LookupResult result;
|
|
LocalLookupRealNamedProperty(key, &result);
|
|
if (result.IsValid()) {
|
|
switch (result.type()) {
|
|
case NORMAL: // fall through.
|
|
case FIELD: // fall through.
|
|
case CALLBACKS: // fall through.
|
|
case CONSTANT_FUNCTION:
|
|
return true;
|
|
case INTERCEPTOR:
|
|
case MAP_TRANSITION:
|
|
case CONSTANT_TRANSITION:
|
|
case NULL_DESCRIPTOR:
|
|
return false;
|
|
default:
|
|
UNREACHABLE();
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
bool JSObject::HasRealElementProperty(uint32_t index) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayIndexedAccess(this, index, v8::ACCESS_HAS)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_HAS);
|
|
return false;
|
|
}
|
|
|
|
// Handle [] on String objects.
|
|
if (this->IsStringObjectWithCharacterAt(index)) return true;
|
|
|
|
if (HasFastElements()) {
|
|
uint32_t length = IsJSArray() ?
|
|
static_cast<uint32_t>(
|
|
Smi::cast(JSArray::cast(this)->length())->value()) :
|
|
static_cast<uint32_t>(FixedArray::cast(elements())->length());
|
|
return (index < length) &&
|
|
!FixedArray::cast(elements())->get(index)->IsTheHole();
|
|
}
|
|
return element_dictionary()->FindNumberEntry(index) != -1;
|
|
}
|
|
|
|
|
|
bool JSObject::HasRealNamedCallbackProperty(String* key) {
|
|
// Check access rights if needed.
|
|
if (IsAccessCheckNeeded() &&
|
|
!Top::MayNamedAccess(this, key, v8::ACCESS_HAS)) {
|
|
Top::ReportFailedAccessCheck(this, v8::ACCESS_HAS);
|
|
return false;
|
|
}
|
|
|
|
LookupResult result;
|
|
LocalLookupRealNamedProperty(key, &result);
|
|
return result.IsValid() && (result.type() == CALLBACKS);
|
|
}
|
|
|
|
|
|
int JSObject::NumberOfLocalProperties(PropertyAttributes filter) {
|
|
if (HasFastProperties()) {
|
|
int result = 0;
|
|
for (DescriptorReader r(map()->instance_descriptors());
|
|
!r.eos();
|
|
r.advance()) {
|
|
PropertyDetails details = r.GetDetails();
|
|
if (!details.IsTransition() && (details.attributes() & filter) == 0) {
|
|
result++;
|
|
}
|
|
}
|
|
return result;
|
|
} else {
|
|
return property_dictionary()->NumberOfElementsFilterAttributes(filter);
|
|
}
|
|
}
|
|
|
|
|
|
int JSObject::NumberOfEnumProperties() {
|
|
return NumberOfLocalProperties(static_cast<PropertyAttributes>(DONT_ENUM));
|
|
}
|
|
|
|
|
|
void FixedArray::Swap(int i, int j) {
|
|
Object* temp = get(i);
|
|
set(i, get(j));
|
|
set(j, temp);
|
|
}
|
|
|
|
|
|
static void InsertionSortPairs(FixedArray* content, FixedArray* smis) {
|
|
int len = smis->length();
|
|
for (int i = 1; i < len; i++) {
|
|
int j = i;
|
|
while (j > 0 &&
|
|
Smi::cast(smis->get(j-1))->value() >
|
|
Smi::cast(smis->get(j))->value()) {
|
|
smis->Swap(j-1, j);
|
|
content->Swap(j-1, j);
|
|
j--;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void HeapSortPairs(FixedArray* content, FixedArray* smis) {
|
|
// In-place heap sort.
|
|
ASSERT(content->length() == smis->length());
|
|
int len = smis->length();
|
|
|
|
// Bottom-up max-heap construction.
|
|
for (int i = 1; i < len; ++i) {
|
|
int child_index = i;
|
|
while (child_index > 0) {
|
|
int parent_index = ((child_index + 1) >> 1) - 1;
|
|
int parent_value = Smi::cast(smis->get(parent_index))->value();
|
|
int child_value = Smi::cast(smis->get(child_index))->value();
|
|
if (parent_value < child_value) {
|
|
content->Swap(parent_index, child_index);
|
|
smis->Swap(parent_index, child_index);
|
|
} else {
|
|
break;
|
|
}
|
|
child_index = parent_index;
|
|
}
|
|
}
|
|
|
|
// Extract elements and create sorted array.
|
|
for (int i = len - 1; i > 0; --i) {
|
|
// Put max element at the back of the array.
|
|
content->Swap(0, i);
|
|
smis->Swap(0, i);
|
|
// Sift down the new top element.
|
|
int parent_index = 0;
|
|
while (true) {
|
|
int child_index = ((parent_index + 1) << 1) - 1;
|
|
if (child_index >= i) break;
|
|
uint32_t child1_value = Smi::cast(smis->get(child_index))->value();
|
|
uint32_t child2_value = Smi::cast(smis->get(child_index + 1))->value();
|
|
uint32_t parent_value = Smi::cast(smis->get(parent_index))->value();
|
|
if (child_index + 1 >= i || child1_value > child2_value) {
|
|
if (parent_value > child1_value) break;
|
|
content->Swap(parent_index, child_index);
|
|
smis->Swap(parent_index, child_index);
|
|
parent_index = child_index;
|
|
} else {
|
|
if (parent_value > child2_value) break;
|
|
content->Swap(parent_index, child_index + 1);
|
|
smis->Swap(parent_index, child_index + 1);
|
|
parent_index = child_index + 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// Sort this array and the smis as pairs wrt. the (distinct) smis.
|
|
void FixedArray::SortPairs(FixedArray* smis) {
|
|
ASSERT(this->length() == smis->length());
|
|
int len = smis->length();
|
|
// For small arrays, simply use insertion sort.
|
|
if (len <= 10) {
|
|
InsertionSortPairs(this, smis);
|
|
return;
|
|
}
|
|
// Check the range of indices.
|
|
int min_index = Smi::cast(smis->get(0))->value();
|
|
int max_index = min_index;
|
|
int i;
|
|
for (i = 1; i < len; i++) {
|
|
if (Smi::cast(smis->get(i))->value() < min_index) {
|
|
min_index = Smi::cast(smis->get(i))->value();
|
|
} else if (Smi::cast(smis->get(i))->value() > max_index) {
|
|
max_index = Smi::cast(smis->get(i))->value();
|
|
}
|
|
}
|
|
if (max_index - min_index + 1 == len) {
|
|
// Indices form a contiguous range, unless there are duplicates.
|
|
// Do an in-place linear time sort assuming distinct smis, but
|
|
// avoid hanging in case they are not.
|
|
for (i = 0; i < len; i++) {
|
|
int p;
|
|
int j = 0;
|
|
// While the current element at i is not at its correct position p,
|
|
// swap the elements at these two positions.
|
|
while ((p = Smi::cast(smis->get(i))->value() - min_index) != i &&
|
|
j++ < len) {
|
|
this->Swap(i, p);
|
|
smis->Swap(i, p);
|
|
}
|
|
}
|
|
} else {
|
|
HeapSortPairs(this, smis);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
// Fill in the names of local properties into the supplied storage. The main
|
|
// purpose of this function is to provide reflection information for the object
|
|
// mirrors.
|
|
void JSObject::GetLocalPropertyNames(FixedArray* storage) {
|
|
ASSERT(storage->length() ==
|
|
NumberOfLocalProperties(static_cast<PropertyAttributes>(NONE)));
|
|
int index = 0;
|
|
if (HasFastProperties()) {
|
|
for (DescriptorReader r(map()->instance_descriptors());
|
|
!r.eos();
|
|
r.advance()) {
|
|
if (!r.IsTransition()) {
|
|
storage->set(index++, r.GetKey());
|
|
}
|
|
}
|
|
ASSERT(storage->length() == index);
|
|
} else {
|
|
property_dictionary()->CopyKeysTo(storage);
|
|
}
|
|
}
|
|
|
|
|
|
int JSObject::NumberOfLocalElements(PropertyAttributes filter) {
|
|
return GetLocalElementKeys(NULL, filter);
|
|
}
|
|
|
|
|
|
int JSObject::NumberOfEnumElements() {
|
|
return NumberOfLocalElements(static_cast<PropertyAttributes>(DONT_ENUM));
|
|
}
|
|
|
|
|
|
int JSObject::GetLocalElementKeys(FixedArray* storage,
|
|
PropertyAttributes filter) {
|
|
int counter = 0;
|
|
if (HasFastElements()) {
|
|
int length = IsJSArray()
|
|
? Smi::cast(JSArray::cast(this)->length())->value()
|
|
: FixedArray::cast(elements())->length();
|
|
for (int i = 0; i < length; i++) {
|
|
if (!FixedArray::cast(elements())->get(i)->IsTheHole()) {
|
|
if (storage) {
|
|
storage->set(counter,
|
|
Smi::FromInt(i),
|
|
FixedArray::SKIP_WRITE_BARRIER);
|
|
}
|
|
counter++;
|
|
}
|
|
}
|
|
ASSERT(!storage || storage->length() >= counter);
|
|
} else {
|
|
if (storage) {
|
|
element_dictionary()->CopyKeysTo(storage, filter);
|
|
}
|
|
counter = element_dictionary()->NumberOfElementsFilterAttributes(filter);
|
|
}
|
|
|
|
if (this->IsJSValue()) {
|
|
Object* val = JSValue::cast(this)->value();
|
|
if (val->IsString()) {
|
|
String* str = String::cast(val);
|
|
if (storage) {
|
|
for (int i = 0; i < str->length(); i++) {
|
|
storage->set(counter + i,
|
|
Smi::FromInt(i),
|
|
FixedArray::SKIP_WRITE_BARRIER);
|
|
}
|
|
}
|
|
counter += str->length();
|
|
}
|
|
}
|
|
ASSERT(!storage || storage->length() == counter);
|
|
return counter;
|
|
}
|
|
|
|
|
|
int JSObject::GetEnumElementKeys(FixedArray* storage) {
|
|
return GetLocalElementKeys(storage,
|
|
static_cast<PropertyAttributes>(DONT_ENUM));
|
|
}
|
|
|
|
|
|
// The NumberKey uses carries the uint32_t as key.
|
|
// This avoids allocation in HasProperty.
|
|
class NumberKey : public HashTableKey {
|
|
public:
|
|
explicit NumberKey(uint32_t number) {
|
|
number_ = number;
|
|
}
|
|
|
|
private:
|
|
bool IsMatch(Object* other) {
|
|
return number_ == ToUint32(other);
|
|
}
|
|
|
|
// Thomas Wang, Integer Hash Functions.
|
|
// http://www.concentric.net/~Ttwang/tech/inthash.htm
|
|
static uint32_t ComputeHash(uint32_t key) {
|
|
uint32_t hash = key;
|
|
hash = ~hash + (hash << 15); // hash = (hash << 15) - hash - 1;
|
|
hash = hash ^ (hash >> 12);
|
|
hash = hash + (hash << 2);
|
|
hash = hash ^ (hash >> 4);
|
|
hash = hash * 2057; // hash = (hash + (hash << 3)) + (hash << 11);
|
|
hash = hash ^ (hash >> 16);
|
|
return hash;
|
|
}
|
|
|
|
uint32_t Hash() { return ComputeHash(number_); }
|
|
|
|
HashFunction GetHashFunction() { return NumberHash; }
|
|
|
|
Object* GetObject() {
|
|
return Heap::NumberFromDouble(number_);
|
|
}
|
|
|
|
static uint32_t NumberHash(Object* obj) {
|
|
return ComputeHash(ToUint32(obj));
|
|
}
|
|
|
|
static uint32_t ToUint32(Object* obj) {
|
|
ASSERT(obj->IsNumber());
|
|
return static_cast<uint32_t>(obj->Number());
|
|
}
|
|
|
|
bool IsStringKey() { return false; }
|
|
|
|
uint32_t number_;
|
|
};
|
|
|
|
|
|
// StringKey simply carries a string object as key.
|
|
class StringKey : public HashTableKey {
|
|
public:
|
|
explicit StringKey(String* string) {
|
|
string_ = string;
|
|
}
|
|
|
|
bool IsMatch(Object* other) {
|
|
if (!other->IsString()) return false;
|
|
return string_->Equals(String::cast(other));
|
|
}
|
|
|
|
uint32_t Hash() { return StringHash(string_); }
|
|
|
|
HashFunction GetHashFunction() { return StringHash; }
|
|
|
|
Object* GetObject() { return string_; }
|
|
|
|
static uint32_t StringHash(Object* obj) {
|
|
return String::cast(obj)->Hash();
|
|
}
|
|
|
|
bool IsStringKey() { return true; }
|
|
|
|
String* string_;
|
|
};
|
|
|
|
// Utf8SymbolKey carries a vector of chars as key.
|
|
class Utf8SymbolKey : public HashTableKey {
|
|
public:
|
|
explicit Utf8SymbolKey(Vector<const char> string)
|
|
: string_(string), hash_(0) { }
|
|
|
|
bool IsMatch(Object* other) {
|
|
if (!other->IsString()) return false;
|
|
return String::cast(other)->IsEqualTo(string_);
|
|
}
|
|
|
|
HashFunction GetHashFunction() {
|
|
return StringHash;
|
|
}
|
|
|
|
uint32_t Hash() {
|
|
if (hash_ != 0) return hash_;
|
|
unibrow::Utf8InputBuffer<> buffer(string_.start(),
|
|
static_cast<unsigned>(string_.length()));
|
|
chars_ = buffer.Length();
|
|
hash_ = String::ComputeHashCode(&buffer, chars_);
|
|
return hash_;
|
|
}
|
|
|
|
Object* GetObject() {
|
|
if (hash_ == 0) Hash();
|
|
unibrow::Utf8InputBuffer<> buffer(string_.start(),
|
|
static_cast<unsigned>(string_.length()));
|
|
return Heap::AllocateSymbol(&buffer, chars_, hash_);
|
|
}
|
|
|
|
static uint32_t StringHash(Object* obj) {
|
|
return String::cast(obj)->Hash();
|
|
}
|
|
|
|
bool IsStringKey() { return true; }
|
|
|
|
Vector<const char> string_;
|
|
uint32_t hash_;
|
|
int chars_; // Caches the number of characters when computing the hash code.
|
|
};
|
|
|
|
|
|
// SymbolKey carries a string/symbol object as key.
|
|
class SymbolKey : public HashTableKey {
|
|
public:
|
|
explicit SymbolKey(String* string) : string_(string) { }
|
|
|
|
HashFunction GetHashFunction() {
|
|
return StringHash;
|
|
}
|
|
|
|
bool IsMatch(Object* other) {
|
|
if (!other->IsString()) return false;
|
|
return String::cast(other)->Equals(string_);
|
|
}
|
|
|
|
uint32_t Hash() { return string_->Hash(); }
|
|
|
|
Object* GetObject() {
|
|
// If the string is a cons string, attempt to flatten it so that
|
|
// symbols will most often be flat strings.
|
|
if (string_->IsConsString()) {
|
|
ConsString* cons_string = ConsString::cast(string_);
|
|
cons_string->TryFlatten();
|
|
if (cons_string->second() == Heap::empty_string()) {
|
|
string_ = String::cast(cons_string->first());
|
|
}
|
|
}
|
|
// Transform string to symbol if possible.
|
|
Map* map = Heap::SymbolMapForString(string_);
|
|
if (map != NULL) {
|
|
string_->set_map(map);
|
|
return string_;
|
|
}
|
|
// Otherwise allocate a new symbol.
|
|
StringInputBuffer buffer(string_);
|
|
return Heap::AllocateSymbol(&buffer, string_->length(), string_->Hash());
|
|
}
|
|
|
|
static uint32_t StringHash(Object* obj) {
|
|
return String::cast(obj)->Hash();
|
|
}
|
|
|
|
bool IsStringKey() { return true; }
|
|
|
|
String* string_;
|
|
};
|
|
|
|
|
|
template<int prefix_size, int element_size>
|
|
void HashTable<prefix_size, element_size>::IteratePrefix(ObjectVisitor* v) {
|
|
IteratePointers(v, 0, kElementsStartOffset);
|
|
}
|
|
|
|
|
|
template<int prefix_size, int element_size>
|
|
void HashTable<prefix_size, element_size>::IterateElements(ObjectVisitor* v) {
|
|
IteratePointers(v,
|
|
kElementsStartOffset,
|
|
kHeaderSize + length() * kPointerSize);
|
|
}
|
|
|
|
|
|
template<int prefix_size, int element_size>
|
|
Object* HashTable<prefix_size, element_size>::Allocate(int at_least_space_for) {
|
|
int capacity = RoundUpToPowerOf2(at_least_space_for);
|
|
if (capacity < 4) capacity = 4; // Guarantee min capacity.
|
|
Object* obj = Heap::AllocateHashTable(EntryToIndex(capacity));
|
|
if (!obj->IsFailure()) {
|
|
HashTable::cast(obj)->SetNumberOfElements(0);
|
|
HashTable::cast(obj)->SetCapacity(capacity);
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
|
|
// Find entry for key otherwise return -1.
|
|
template <int prefix_size, int element_size>
|
|
int HashTable<prefix_size, element_size>::FindEntry(HashTableKey* key) {
|
|
uint32_t nof = NumberOfElements();
|
|
if (nof == 0) return -1; // Bail out if empty.
|
|
|
|
uint32_t capacity = Capacity();
|
|
uint32_t hash = key->Hash();
|
|
uint32_t entry = GetProbe(hash, 0, capacity);
|
|
|
|
Object* element = KeyAt(entry);
|
|
uint32_t passed_elements = 0;
|
|
if (!element->IsNull()) {
|
|
if (!element->IsUndefined() && key->IsMatch(element)) return entry;
|
|
if (++passed_elements == nof) return -1;
|
|
}
|
|
for (uint32_t i = 1; !element->IsUndefined(); i++) {
|
|
entry = GetProbe(hash, i, capacity);
|
|
element = KeyAt(entry);
|
|
if (!element->IsNull()) {
|
|
if (!element->IsUndefined() && key->IsMatch(element)) return entry;
|
|
if (++passed_elements == nof) return -1;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
template<int prefix_size, int element_size>
|
|
Object* HashTable<prefix_size, element_size>::EnsureCapacity(
|
|
int n, HashTableKey* key) {
|
|
int capacity = Capacity();
|
|
int nof = NumberOfElements() + n;
|
|
// Make sure 20% is free
|
|
if (nof + (nof >> 2) <= capacity) return this;
|
|
|
|
Object* obj = Allocate(nof * 2);
|
|
if (obj->IsFailure()) return obj;
|
|
HashTable* table = HashTable::cast(obj);
|
|
WriteBarrierMode mode = table->GetWriteBarrierMode();
|
|
|
|
// Copy prefix to new array.
|
|
for (int i = kPrefixStartIndex; i < kPrefixStartIndex + prefix_size; i++) {
|
|
table->set(i, get(i), mode);
|
|
}
|
|
// Rehash the elements.
|
|
uint32_t (*Hash)(Object* key) = key->GetHashFunction();
|
|
for (int i = 0; i < capacity; i++) {
|
|
uint32_t from_index = EntryToIndex(i);
|
|
Object* key = get(from_index);
|
|
if (IsKey(key)) {
|
|
uint32_t insertion_index =
|
|
EntryToIndex(table->FindInsertionEntry(key, Hash(key)));
|
|
for (int j = 0; j < element_size; j++) {
|
|
table->set(insertion_index + j, get(from_index + j), mode);
|
|
}
|
|
}
|
|
}
|
|
table->SetNumberOfElements(NumberOfElements());
|
|
return table;
|
|
}
|
|
|
|
|
|
template<int prefix_size, int element_size>
|
|
uint32_t HashTable<prefix_size, element_size>::FindInsertionEntry(
|
|
Object* key,
|
|
uint32_t hash) {
|
|
uint32_t capacity = Capacity();
|
|
uint32_t entry = GetProbe(hash, 0, capacity);
|
|
Object* element = KeyAt(entry);
|
|
|
|
for (uint32_t i = 1; !(element->IsUndefined() || element->IsNull()); i++) {
|
|
entry = GetProbe(hash, i, capacity);
|
|
element = KeyAt(entry);
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
|
|
|
|
// Force instantiation of SymbolTable's base class
|
|
template class HashTable<0, 1>;
|
|
|
|
|
|
// Force instantiation of Dictionary's base class
|
|
template class HashTable<2, 3>;
|
|
|
|
|
|
// Force instantiation of EvalCache's base class
|
|
template class HashTable<0, 2>;
|
|
|
|
|
|
Object* SymbolTable::LookupString(String* string, Object** s) {
|
|
SymbolKey key(string);
|
|
return LookupKey(&key, s);
|
|
}
|
|
|
|
|
|
Object* SymbolTable::LookupSymbol(Vector<const char> str, Object** s) {
|
|
Utf8SymbolKey key(str);
|
|
return LookupKey(&key, s);
|
|
}
|
|
|
|
|
|
Object* SymbolTable::LookupKey(HashTableKey* key, Object** s) {
|
|
int entry = FindEntry(key);
|
|
|
|
// Symbol already in table.
|
|
if (entry != -1) {
|
|
*s = KeyAt(entry);
|
|
return this;
|
|
}
|
|
|
|
// Adding new symbol. Grow table if needed.
|
|
Object* obj = EnsureCapacity(1, key);
|
|
if (obj->IsFailure()) return obj;
|
|
|
|
// Create symbol object.
|
|
Object* symbol = key->GetObject();
|
|
if (symbol->IsFailure()) return symbol;
|
|
|
|
// If the symbol table grew as part of EnsureCapacity, obj is not
|
|
// the current symbol table and therefore we cannot use
|
|
// SymbolTable::cast here.
|
|
SymbolTable* table = reinterpret_cast<SymbolTable*>(obj);
|
|
|
|
// Add the new symbol and return it along with the symbol table.
|
|
entry = table->FindInsertionEntry(symbol, key->Hash());
|
|
table->set(EntryToIndex(entry), symbol);
|
|
table->ElementAdded();
|
|
*s = symbol;
|
|
return table;
|
|
}
|
|
|
|
|
|
Object* CompilationCacheTable::Lookup(String* src) {
|
|
StringKey key(src);
|
|
int entry = FindEntry(&key);
|
|
if (entry != -1) {
|
|
return get(EntryToIndex(entry) + 1);
|
|
} else {
|
|
return Heap::undefined_value();
|
|
}
|
|
}
|
|
|
|
|
|
Object* CompilationCacheTable::Put(String* src, Object* value) {
|
|
StringKey key(src);
|
|
Object* obj = EnsureCapacity(1, &key);
|
|
if (obj->IsFailure()) return obj;
|
|
|
|
CompilationCacheTable* cache =
|
|
reinterpret_cast<CompilationCacheTable*>(obj);
|
|
int entry = cache->FindInsertionEntry(src, key.Hash());
|
|
cache->set(EntryToIndex(entry), src);
|
|
cache->set(EntryToIndex(entry) + 1, value);
|
|
cache->ElementAdded();
|
|
return cache;
|
|
}
|
|
|
|
|
|
// SymbolsKey used for HashTable where key is array of symbols.
|
|
class SymbolsKey : public HashTableKey {
|
|
public:
|
|
explicit SymbolsKey(FixedArray* symbols) {
|
|
symbols_ = symbols;
|
|
}
|
|
|
|
bool IsMatch(Object* other) {
|
|
if (!other->IsFixedArray()) return false;
|
|
FixedArray* o = FixedArray::cast(other);
|
|
int len = symbols_->length();
|
|
if (o->length() != len) return false;
|
|
for (int i = 0; i < len; i++) {
|
|
if (o->get(i) != symbols_->get(i)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
uint32_t Hash() { return SymbolsHash(symbols_); }
|
|
|
|
HashFunction GetHashFunction() { return SymbolsHash; }
|
|
|
|
Object* GetObject() { return symbols_; }
|
|
|
|
static uint32_t SymbolsHash(Object* obj) {
|
|
FixedArray* symbols_ = FixedArray::cast(obj);
|
|
int len = symbols_->length();
|
|
uint32_t hash = 0;
|
|
for (int i = 0; i < len; i++) {
|
|
hash ^= String::cast(symbols_->get(i))->Hash();
|
|
}
|
|
return hash;
|
|
}
|
|
|
|
bool IsStringKey() { return false; }
|
|
|
|
FixedArray* symbols_;
|
|
};
|
|
|
|
Object* MapCache::Lookup(FixedArray* array) {
|
|
SymbolsKey key(array);
|
|
int entry = FindEntry(&key);
|
|
if (entry != -1) {
|
|
return get(EntryToIndex(entry) + 1);
|
|
} else {
|
|
return Heap::undefined_value();
|
|
}
|
|
}
|
|
|
|
|
|
Object* MapCache::Put(FixedArray* array, Map* value) {
|
|
SymbolsKey key(array);
|
|
Object* obj = EnsureCapacity(1, &key);
|
|
if (obj->IsFailure()) return obj;
|
|
|
|
MapCache* cache = reinterpret_cast<MapCache*>(obj);
|
|
int entry = cache->FindInsertionEntry(array, key.Hash());
|
|
cache->set(EntryToIndex(entry), array);
|
|
cache->set(EntryToIndex(entry) + 1, value);
|
|
cache->ElementAdded();
|
|
return cache;
|
|
}
|
|
|
|
|
|
Object* Dictionary::Allocate(int at_least_space_for) {
|
|
Object* obj = DictionaryBase::Allocate(at_least_space_for);
|
|
// Initialize the next enumeration index.
|
|
if (!obj->IsFailure()) {
|
|
Dictionary::cast(obj)->
|
|
SetNextEnumerationIndex(PropertyDetails::kInitialIndex);
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
Object* Dictionary::GenerateNewEnumerationIndices() {
|
|
int length = NumberOfElements();
|
|
|
|
// Allocate and initialize iteration order array.
|
|
Object* obj = Heap::AllocateFixedArray(length);
|
|
if (obj->IsFailure()) return obj;
|
|
FixedArray* iteration_order = FixedArray::cast(obj);
|
|
for (int i = 0; i < length; i++) iteration_order->set(i, Smi::FromInt(i));
|
|
|
|
// Allocate array with enumeration order.
|
|
obj = Heap::AllocateFixedArray(length);
|
|
if (obj->IsFailure()) return obj;
|
|
FixedArray* enumeration_order = FixedArray::cast(obj);
|
|
|
|
// Fill the enumeration order array with property details.
|
|
int capacity = Capacity();
|
|
int pos = 0;
|
|
for (int i = 0; i < capacity; i++) {
|
|
if (IsKey(KeyAt(i))) {
|
|
enumeration_order->set(pos++, Smi::FromInt(DetailsAt(i).index()));
|
|
}
|
|
}
|
|
|
|
// Sort the arrays wrt. enumeration order.
|
|
iteration_order->SortPairs(enumeration_order);
|
|
|
|
// Overwrite the enumeration_order with the enumeration indices.
|
|
for (int i = 0; i < length; i++) {
|
|
int index = Smi::cast(iteration_order->get(i))->value();
|
|
int enum_index = PropertyDetails::kInitialIndex + i;
|
|
enumeration_order->set(index, Smi::FromInt(enum_index));
|
|
}
|
|
|
|
// Update the dictionary with new indices.
|
|
capacity = Capacity();
|
|
pos = 0;
|
|
for (int i = 0; i < capacity; i++) {
|
|
if (IsKey(KeyAt(i))) {
|
|
int enum_index = Smi::cast(enumeration_order->get(pos++))->value();
|
|
PropertyDetails details = DetailsAt(i);
|
|
PropertyDetails new_details =
|
|
PropertyDetails(details.attributes(), details.type(), enum_index);
|
|
DetailsAtPut(i, new_details);
|
|
}
|
|
}
|
|
|
|
// Set the next enumeration index.
|
|
SetNextEnumerationIndex(PropertyDetails::kInitialIndex+length);
|
|
return this;
|
|
}
|
|
|
|
|
|
Object* Dictionary::EnsureCapacity(int n, HashTableKey* key) {
|
|
// Check whether there are enough enumeration indices to add n elements.
|
|
if (key->IsStringKey() &&
|
|
!PropertyDetails::IsValidIndex(NextEnumerationIndex() + n)) {
|
|
// If not, we generate new indices for the properties.
|
|
Object* result = GenerateNewEnumerationIndices();
|
|
if (result->IsFailure()) return result;
|
|
}
|
|
return DictionaryBase::EnsureCapacity(n, key);
|
|
}
|
|
|
|
|
|
void Dictionary::RemoveNumberEntries(uint32_t from, uint32_t to) {
|
|
// Do nothing if the interval [from, to) is empty.
|
|
if (from >= to) return;
|
|
|
|
int removed_entries = 0;
|
|
Object* sentinel = Heap::null_value();
|
|
int capacity = Capacity();
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* key = KeyAt(i);
|
|
if (key->IsNumber()) {
|
|
uint32_t number = static_cast<uint32_t>(key->Number());
|
|
if (from <= number && number < to) {
|
|
SetEntry(i, sentinel, sentinel, Smi::FromInt(0));
|
|
removed_entries++;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Update the number of elements.
|
|
SetNumberOfElements(NumberOfElements() - removed_entries);
|
|
}
|
|
|
|
|
|
Object* Dictionary::DeleteProperty(int entry) {
|
|
PropertyDetails details = DetailsAt(entry);
|
|
if (details.IsDontDelete()) return Heap::false_value();
|
|
SetEntry(entry, Heap::null_value(), Heap::null_value(), Smi::FromInt(0));
|
|
ElementRemoved();
|
|
return Heap::true_value();
|
|
}
|
|
|
|
|
|
int Dictionary::FindStringEntry(String* key) {
|
|
StringKey k(key);
|
|
return FindEntry(&k);
|
|
}
|
|
|
|
|
|
int Dictionary::FindNumberEntry(uint32_t index) {
|
|
NumberKey k(index);
|
|
return FindEntry(&k);
|
|
}
|
|
|
|
|
|
Object* Dictionary::AtPut(HashTableKey* key, Object* value) {
|
|
int entry = FindEntry(key);
|
|
|
|
// If the entry is present set the value;
|
|
if (entry != -1) {
|
|
ValueAtPut(entry, value);
|
|
return this;
|
|
}
|
|
|
|
// Check whether the dictionary should be extended.
|
|
Object* obj = EnsureCapacity(1, key);
|
|
if (obj->IsFailure()) return obj;
|
|
Object* k = key->GetObject();
|
|
if (k->IsFailure()) return k;
|
|
PropertyDetails details = PropertyDetails(NONE, NORMAL);
|
|
Dictionary::cast(obj)->AddEntry(k, value, details, key->Hash());
|
|
return obj;
|
|
}
|
|
|
|
|
|
Object* Dictionary::Add(HashTableKey* key, Object* value,
|
|
PropertyDetails details) {
|
|
// Check whether the dictionary should be extended.
|
|
Object* obj = EnsureCapacity(1, key);
|
|
if (obj->IsFailure()) return obj;
|
|
// Compute the key object.
|
|
Object* k = key->GetObject();
|
|
if (k->IsFailure()) return k;
|
|
Dictionary::cast(obj)->AddEntry(k, value, details, key->Hash());
|
|
return obj;
|
|
}
|
|
|
|
|
|
// Add a key, value pair to the dictionary.
|
|
void Dictionary::AddEntry(Object* key,
|
|
Object* value,
|
|
PropertyDetails details,
|
|
uint32_t hash) {
|
|
uint32_t entry = FindInsertionEntry(key, hash);
|
|
// Insert element at empty or deleted entry
|
|
if (details.index() == 0 && key->IsString()) {
|
|
// Assign an enumeration index to the property and update
|
|
// SetNextEnumerationIndex.
|
|
int index = NextEnumerationIndex();
|
|
details = PropertyDetails(details.attributes(), details.type(), index);
|
|
SetNextEnumerationIndex(index + 1);
|
|
}
|
|
SetEntry(entry, key, value, details);
|
|
ASSERT(KeyAt(entry)->IsNumber() || KeyAt(entry)->IsString());
|
|
ElementAdded();
|
|
}
|
|
|
|
|
|
void Dictionary::UpdateMaxNumberKey(uint32_t key) {
|
|
// If the dictionary requires slow elements an element has already
|
|
// been added at a high index.
|
|
if (requires_slow_elements()) return;
|
|
// Check if this index is high enough that we should require slow
|
|
// elements.
|
|
if (key > kRequiresSlowElementsLimit) {
|
|
set(kPrefixStartIndex, Smi::FromInt(kRequiresSlowElementsMask));
|
|
return;
|
|
}
|
|
// Update max key value.
|
|
Object* max_index_object = get(kPrefixStartIndex);
|
|
if (!max_index_object->IsSmi() || max_number_key() < key) {
|
|
set(kPrefixStartIndex, Smi::FromInt(key << kRequiresSlowElementsTagSize));
|
|
}
|
|
}
|
|
|
|
|
|
Object* Dictionary::AddStringEntry(String* key,
|
|
Object* value,
|
|
PropertyDetails details) {
|
|
StringKey k(key);
|
|
SLOW_ASSERT(FindEntry(&k) == -1);
|
|
return Add(&k, value, details);
|
|
}
|
|
|
|
|
|
Object* Dictionary::AddNumberEntry(uint32_t key,
|
|
Object* value,
|
|
PropertyDetails details) {
|
|
NumberKey k(key);
|
|
UpdateMaxNumberKey(key);
|
|
SLOW_ASSERT(FindEntry(&k) == -1);
|
|
return Add(&k, value, details);
|
|
}
|
|
|
|
|
|
Object* Dictionary::AtStringPut(String* key, Object* value) {
|
|
StringKey k(key);
|
|
return AtPut(&k, value);
|
|
}
|
|
|
|
|
|
Object* Dictionary::AtNumberPut(uint32_t key, Object* value) {
|
|
NumberKey k(key);
|
|
UpdateMaxNumberKey(key);
|
|
return AtPut(&k, value);
|
|
}
|
|
|
|
|
|
Object* Dictionary::SetOrAddStringEntry(String* key,
|
|
Object* value,
|
|
PropertyDetails details) {
|
|
StringKey k(key);
|
|
int entry = FindEntry(&k);
|
|
if (entry == -1) return AddStringEntry(key, value, details);
|
|
// Preserve enumeration index.
|
|
details = PropertyDetails(details.attributes(),
|
|
details.type(),
|
|
DetailsAt(entry).index());
|
|
SetEntry(entry, key, value, details);
|
|
return this;
|
|
}
|
|
|
|
|
|
int Dictionary::NumberOfElementsFilterAttributes(PropertyAttributes filter) {
|
|
int capacity = Capacity();
|
|
int result = 0;
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k)) {
|
|
PropertyAttributes attr = DetailsAt(i).attributes();
|
|
if ((attr & filter) == 0) result++;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
int Dictionary::NumberOfEnumElements() {
|
|
return NumberOfElementsFilterAttributes(
|
|
static_cast<PropertyAttributes>(DONT_ENUM));
|
|
}
|
|
|
|
|
|
void Dictionary::CopyKeysTo(FixedArray* storage, PropertyAttributes filter) {
|
|
ASSERT(storage->length() >= NumberOfEnumElements());
|
|
int capacity = Capacity();
|
|
int index = 0;
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k)) {
|
|
PropertyAttributes attr = DetailsAt(i).attributes();
|
|
if ((attr & filter) == 0) storage->set(index++, k);
|
|
}
|
|
}
|
|
ASSERT(storage->length() >= index);
|
|
}
|
|
|
|
|
|
void Dictionary::CopyEnumKeysTo(FixedArray* storage, FixedArray* sort_array) {
|
|
ASSERT(storage->length() >= NumberOfEnumElements());
|
|
int capacity = Capacity();
|
|
int index = 0;
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k)) {
|
|
PropertyDetails details = DetailsAt(i);
|
|
if (!details.IsDontEnum()) {
|
|
storage->set(index, k);
|
|
sort_array->set(index, Smi::FromInt(details.index()));
|
|
index++;
|
|
}
|
|
}
|
|
}
|
|
storage->SortPairs(sort_array);
|
|
ASSERT(storage->length() >= index);
|
|
}
|
|
|
|
|
|
void Dictionary::CopyKeysTo(FixedArray* storage) {
|
|
ASSERT(storage->length() >= NumberOfElementsFilterAttributes(
|
|
static_cast<PropertyAttributes>(NONE)));
|
|
int capacity = Capacity();
|
|
int index = 0;
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k)) {
|
|
storage->set(index++, k);
|
|
}
|
|
}
|
|
ASSERT(storage->length() >= index);
|
|
}
|
|
|
|
|
|
// Backwards lookup (slow).
|
|
Object* Dictionary::SlowReverseLookup(Object* value) {
|
|
int capacity = Capacity();
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k) && ValueAt(i) == value) {
|
|
return k;
|
|
}
|
|
}
|
|
return Heap::undefined_value();
|
|
}
|
|
|
|
|
|
Object* Dictionary::TransformPropertiesToFastFor(JSObject* obj,
|
|
int unused_property_fields) {
|
|
// Make sure we preserve dictionary representation if there are too many
|
|
// descriptors.
|
|
if (NumberOfElements() > DescriptorArray::kMaxNumberOfDescriptors) return obj;
|
|
|
|
// Figure out if it is necessary to generate new enumeration indices.
|
|
int max_enumeration_index =
|
|
NextEnumerationIndex() +
|
|
(DescriptorArray::kMaxNumberOfDescriptors - NumberOfElements());
|
|
if (!PropertyDetails::IsValidIndex(max_enumeration_index)) {
|
|
Object* result = GenerateNewEnumerationIndices();
|
|
if (result->IsFailure()) return result;
|
|
}
|
|
|
|
int instance_descriptor_length = 0;
|
|
int number_of_fields = 0;
|
|
|
|
// Compute the length of the instance descriptor.
|
|
int capacity = Capacity();
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k)) {
|
|
Object* value = ValueAt(i);
|
|
PropertyType type = DetailsAt(i).type();
|
|
ASSERT(type != FIELD);
|
|
instance_descriptor_length++;
|
|
if (type == NORMAL && !value->IsJSFunction()) number_of_fields += 1;
|
|
}
|
|
}
|
|
|
|
// Allocate the instance descriptor.
|
|
Object* descriptors_unchecked =
|
|
DescriptorArray::Allocate(instance_descriptor_length);
|
|
if (descriptors_unchecked->IsFailure()) return descriptors_unchecked;
|
|
DescriptorArray* descriptors = DescriptorArray::cast(descriptors_unchecked);
|
|
|
|
int number_of_allocated_fields = number_of_fields + unused_property_fields;
|
|
|
|
// Allocate the fixed array for the fields.
|
|
Object* fields = Heap::AllocateFixedArray(number_of_allocated_fields);
|
|
if (fields->IsFailure()) return fields;
|
|
|
|
// Fill in the instance descriptor and the fields.
|
|
DescriptorWriter w(descriptors);
|
|
int current_offset = 0;
|
|
for (int i = 0; i < capacity; i++) {
|
|
Object* k = KeyAt(i);
|
|
if (IsKey(k)) {
|
|
Object* value = ValueAt(i);
|
|
// Ensure the key is a symbol before writing into the instance descriptor.
|
|
Object* key = Heap::LookupSymbol(String::cast(k));
|
|
if (key->IsFailure()) return key;
|
|
PropertyDetails details = DetailsAt(i);
|
|
PropertyType type = details.type();
|
|
if (value->IsJSFunction()) {
|
|
ConstantFunctionDescriptor d(String::cast(key),
|
|
JSFunction::cast(value),
|
|
details.attributes(),
|
|
details.index());
|
|
w.Write(&d);
|
|
} else if (type == NORMAL) {
|
|
FixedArray::cast(fields)->set(current_offset, value);
|
|
FieldDescriptor d(String::cast(key),
|
|
current_offset++,
|
|
details.attributes(),
|
|
details.index());
|
|
w.Write(&d);
|
|
} else if (type == CALLBACKS) {
|
|
CallbacksDescriptor d(String::cast(key),
|
|
value,
|
|
details.attributes(),
|
|
details.index());
|
|
w.Write(&d);
|
|
} else {
|
|
UNREACHABLE();
|
|
}
|
|
}
|
|
}
|
|
ASSERT(current_offset == number_of_fields);
|
|
|
|
descriptors->Sort();
|
|
// Allocate new map.
|
|
Object* new_map = obj->map()->Copy();
|
|
if (new_map->IsFailure()) return new_map;
|
|
|
|
// Transform the object.
|
|
obj->set_map(Map::cast(new_map));
|
|
obj->map()->set_instance_descriptors(descriptors);
|
|
obj->map()->set_unused_property_fields(unused_property_fields);
|
|
|
|
obj->set_properties(FixedArray::cast(fields));
|
|
ASSERT(obj->IsJSObject());
|
|
|
|
descriptors->SetNextEnumerationIndex(NextEnumerationIndex());
|
|
// Check it really works.
|
|
ASSERT(obj->HasFastProperties());
|
|
return obj;
|
|
}
|
|
|
|
|
|
// Check if there is a break point at this code position.
|
|
bool DebugInfo::HasBreakPoint(int code_position) {
|
|
// Get the break point info object for this code position.
|
|
Object* break_point_info = GetBreakPointInfo(code_position);
|
|
|
|
// If there is no break point info object or no break points in the break
|
|
// point info object there is no break point at this code position.
|
|
if (break_point_info->IsUndefined()) return false;
|
|
return BreakPointInfo::cast(break_point_info)->GetBreakPointCount() > 0;
|
|
}
|
|
|
|
|
|
// Get the break point info object for this code position.
|
|
Object* DebugInfo::GetBreakPointInfo(int code_position) {
|
|
// Find the index of the break point info object for this code position.
|
|
int index = GetBreakPointInfoIndex(code_position);
|
|
|
|
// Return the break point info object if any.
|
|
if (index == kNoBreakPointInfo) return Heap::undefined_value();
|
|
return BreakPointInfo::cast(break_points()->get(index));
|
|
}
|
|
|
|
|
|
// Clear a break point at the specified code position.
|
|
void DebugInfo::ClearBreakPoint(Handle<DebugInfo> debug_info,
|
|
int code_position,
|
|
Handle<Object> break_point_object) {
|
|
Handle<Object> break_point_info(debug_info->GetBreakPointInfo(code_position));
|
|
if (break_point_info->IsUndefined()) return;
|
|
BreakPointInfo::ClearBreakPoint(
|
|
Handle<BreakPointInfo>::cast(break_point_info),
|
|
break_point_object);
|
|
}
|
|
|
|
|
|
void DebugInfo::SetBreakPoint(Handle<DebugInfo> debug_info,
|
|
int code_position,
|
|
int source_position,
|
|
int statement_position,
|
|
Handle<Object> break_point_object) {
|
|
Handle<Object> break_point_info(debug_info->GetBreakPointInfo(code_position));
|
|
if (!break_point_info->IsUndefined()) {
|
|
BreakPointInfo::SetBreakPoint(
|
|
Handle<BreakPointInfo>::cast(break_point_info),
|
|
break_point_object);
|
|
return;
|
|
}
|
|
|
|
// Adding a new break point for a code position which did not have any
|
|
// break points before. Try to find a free slot.
|
|
int index = kNoBreakPointInfo;
|
|
for (int i = 0; i < debug_info->break_points()->length(); i++) {
|
|
if (debug_info->break_points()->get(i)->IsUndefined()) {
|
|
index = i;
|
|
break;
|
|
}
|
|
}
|
|
if (index == kNoBreakPointInfo) {
|
|
// No free slot - extend break point info array.
|
|
Handle<FixedArray> old_break_points =
|
|
Handle<FixedArray>(FixedArray::cast(debug_info->break_points()));
|
|
debug_info->set_break_points(*Factory::NewFixedArray(
|
|
old_break_points->length() +
|
|
Debug::kEstimatedNofBreakPointsInFunction));
|
|
Handle<FixedArray> new_break_points =
|
|
Handle<FixedArray>(FixedArray::cast(debug_info->break_points()));
|
|
for (int i = 0; i < old_break_points->length(); i++) {
|
|
new_break_points->set(i, old_break_points->get(i));
|
|
}
|
|
index = old_break_points->length();
|
|
}
|
|
ASSERT(index != kNoBreakPointInfo);
|
|
|
|
// Allocate new BreakPointInfo object and set the break point.
|
|
Handle<BreakPointInfo> new_break_point_info =
|
|
Handle<BreakPointInfo>::cast(Factory::NewStruct(BREAK_POINT_INFO_TYPE));
|
|
new_break_point_info->set_code_position(Smi::FromInt(code_position));
|
|
new_break_point_info->set_source_position(Smi::FromInt(source_position));
|
|
new_break_point_info->
|
|
set_statement_position(Smi::FromInt(statement_position));
|
|
new_break_point_info->set_break_point_objects(Heap::undefined_value());
|
|
BreakPointInfo::SetBreakPoint(new_break_point_info, break_point_object);
|
|
debug_info->break_points()->set(index, *new_break_point_info);
|
|
}
|
|
|
|
|
|
// Get the break point objects for a code position.
|
|
Object* DebugInfo::GetBreakPointObjects(int code_position) {
|
|
Object* break_point_info = GetBreakPointInfo(code_position);
|
|
if (break_point_info->IsUndefined()) {
|
|
return Heap::undefined_value();
|
|
}
|
|
return BreakPointInfo::cast(break_point_info)->break_point_objects();
|
|
}
|
|
|
|
|
|
// Get the total number of break points.
|
|
int DebugInfo::GetBreakPointCount() {
|
|
if (break_points()->IsUndefined()) return 0;
|
|
int count = 0;
|
|
for (int i = 0; i < break_points()->length(); i++) {
|
|
if (!break_points()->get(i)->IsUndefined()) {
|
|
BreakPointInfo* break_point_info =
|
|
BreakPointInfo::cast(break_points()->get(i));
|
|
count += break_point_info->GetBreakPointCount();
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
|
|
Object* DebugInfo::FindBreakPointInfo(Handle<DebugInfo> debug_info,
|
|
Handle<Object> break_point_object) {
|
|
if (debug_info->break_points()->IsUndefined()) return Heap::undefined_value();
|
|
for (int i = 0; i < debug_info->break_points()->length(); i++) {
|
|
if (!debug_info->break_points()->get(i)->IsUndefined()) {
|
|
Handle<BreakPointInfo> break_point_info =
|
|
Handle<BreakPointInfo>(BreakPointInfo::cast(
|
|
debug_info->break_points()->get(i)));
|
|
if (BreakPointInfo::HasBreakPointObject(break_point_info,
|
|
break_point_object)) {
|
|
return *break_point_info;
|
|
}
|
|
}
|
|
}
|
|
return Heap::undefined_value();
|
|
}
|
|
|
|
|
|
// Find the index of the break point info object for the specified code
|
|
// position.
|
|
int DebugInfo::GetBreakPointInfoIndex(int code_position) {
|
|
if (break_points()->IsUndefined()) return kNoBreakPointInfo;
|
|
for (int i = 0; i < break_points()->length(); i++) {
|
|
if (!break_points()->get(i)->IsUndefined()) {
|
|
BreakPointInfo* break_point_info =
|
|
BreakPointInfo::cast(break_points()->get(i));
|
|
if (break_point_info->code_position()->value() == code_position) {
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
return kNoBreakPointInfo;
|
|
}
|
|
|
|
|
|
// Remove the specified break point object.
|
|
void BreakPointInfo::ClearBreakPoint(Handle<BreakPointInfo> break_point_info,
|
|
Handle<Object> break_point_object) {
|
|
// If there are no break points just ignore.
|
|
if (break_point_info->break_point_objects()->IsUndefined()) return;
|
|
// If there is a single break point clear it if it is the same.
|
|
if (!break_point_info->break_point_objects()->IsFixedArray()) {
|
|
if (break_point_info->break_point_objects() == *break_point_object) {
|
|
break_point_info->set_break_point_objects(Heap::undefined_value());
|
|
}
|
|
return;
|
|
}
|
|
// If there are multiple break points shrink the array
|
|
ASSERT(break_point_info->break_point_objects()->IsFixedArray());
|
|
Handle<FixedArray> old_array =
|
|
Handle<FixedArray>(
|
|
FixedArray::cast(break_point_info->break_point_objects()));
|
|
Handle<FixedArray> new_array =
|
|
Factory::NewFixedArray(old_array->length() - 1);
|
|
int found_count = 0;
|
|
for (int i = 0; i < old_array->length(); i++) {
|
|
if (old_array->get(i) == *break_point_object) {
|
|
ASSERT(found_count == 0);
|
|
found_count++;
|
|
} else {
|
|
new_array->set(i - found_count, old_array->get(i));
|
|
}
|
|
}
|
|
// If the break point was found in the list change it.
|
|
if (found_count > 0) break_point_info->set_break_point_objects(*new_array);
|
|
}
|
|
|
|
|
|
// Add the specified break point object.
|
|
void BreakPointInfo::SetBreakPoint(Handle<BreakPointInfo> break_point_info,
|
|
Handle<Object> break_point_object) {
|
|
// If there was no break point objects before just set it.
|
|
if (break_point_info->break_point_objects()->IsUndefined()) {
|
|
break_point_info->set_break_point_objects(*break_point_object);
|
|
return;
|
|
}
|
|
// If the break point object is the same as before just ignore.
|
|
if (break_point_info->break_point_objects() == *break_point_object) return;
|
|
// If there was one break point object before replace with array.
|
|
if (!break_point_info->break_point_objects()->IsFixedArray()) {
|
|
Handle<FixedArray> array = Factory::NewFixedArray(2);
|
|
array->set(0, break_point_info->break_point_objects());
|
|
array->set(1, *break_point_object);
|
|
break_point_info->set_break_point_objects(*array);
|
|
return;
|
|
}
|
|
// If there was more than one break point before extend array.
|
|
Handle<FixedArray> old_array =
|
|
Handle<FixedArray>(
|
|
FixedArray::cast(break_point_info->break_point_objects()));
|
|
Handle<FixedArray> new_array =
|
|
Factory::NewFixedArray(old_array->length() + 1);
|
|
for (int i = 0; i < old_array->length(); i++) {
|
|
// If the break point was there before just ignore.
|
|
if (old_array->get(i) == *break_point_object) return;
|
|
new_array->set(i, old_array->get(i));
|
|
}
|
|
// Add the new break point.
|
|
new_array->set(old_array->length(), *break_point_object);
|
|
break_point_info->set_break_point_objects(*new_array);
|
|
}
|
|
|
|
|
|
bool BreakPointInfo::HasBreakPointObject(
|
|
Handle<BreakPointInfo> break_point_info,
|
|
Handle<Object> break_point_object) {
|
|
// No break point.
|
|
if (break_point_info->break_point_objects()->IsUndefined()) return false;
|
|
// Single beak point.
|
|
if (!break_point_info->break_point_objects()->IsFixedArray()) {
|
|
return break_point_info->break_point_objects() == *break_point_object;
|
|
}
|
|
// Multiple break points.
|
|
FixedArray* array = FixedArray::cast(break_point_info->break_point_objects());
|
|
for (int i = 0; i < array->length(); i++) {
|
|
if (array->get(i) == *break_point_object) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
// Get the number of break points.
|
|
int BreakPointInfo::GetBreakPointCount() {
|
|
// No break point.
|
|
if (break_point_objects()->IsUndefined()) return 0;
|
|
// Single beak point.
|
|
if (!break_point_objects()->IsFixedArray()) return 1;
|
|
// Multiple break points.
|
|
return FixedArray::cast(break_point_objects())->length();
|
|
}
|
|
|
|
|
|
} } // namespace v8::internal
|