e2dd98a39e
BUG=v8:1543 LOG=n Review URL: https://codereview.chromium.org/1510913005 Cr-Commit-Position: refs/heads/master@{#32756}
591 lines
19 KiB
C++
591 lines
19 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/contexts.h"
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#include "src/ast/scopeinfo.h"
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#include "src/bootstrapper.h"
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#include "src/debug/debug.h"
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#include "src/isolate-inl.h"
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namespace v8 {
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namespace internal {
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Handle<ScriptContextTable> ScriptContextTable::Extend(
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Handle<ScriptContextTable> table, Handle<Context> script_context) {
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Handle<ScriptContextTable> result;
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int used = table->used();
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int length = table->length();
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CHECK(used >= 0 && length > 0 && used < length);
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if (used + kFirstContextSlot == length) {
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CHECK(length < Smi::kMaxValue / 2);
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Isolate* isolate = table->GetIsolate();
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Handle<FixedArray> copy =
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isolate->factory()->CopyFixedArrayAndGrow(table, length);
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copy->set_map(isolate->heap()->script_context_table_map());
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result = Handle<ScriptContextTable>::cast(copy);
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} else {
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result = table;
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}
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result->set_used(used + 1);
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DCHECK(script_context->IsScriptContext());
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result->set(used + kFirstContextSlot, *script_context);
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return result;
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}
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bool ScriptContextTable::Lookup(Handle<ScriptContextTable> table,
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Handle<String> name, LookupResult* result) {
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for (int i = 0; i < table->used(); i++) {
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Handle<Context> context = GetContext(table, i);
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DCHECK(context->IsScriptContext());
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Handle<ScopeInfo> scope_info(context->scope_info());
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int slot_index = ScopeInfo::ContextSlotIndex(
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scope_info, name, &result->mode, &result->init_flag,
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&result->maybe_assigned_flag);
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if (slot_index >= 0) {
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result->context_index = i;
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result->slot_index = slot_index;
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return true;
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}
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}
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return false;
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}
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bool Context::is_declaration_context() {
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if (IsFunctionContext() || IsNativeContext() || IsScriptContext()) {
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return true;
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}
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if (!IsBlockContext()) return false;
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Object* ext = extension();
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// If we have the special extension, we immediately know it must be a
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// declaration scope. That's just a small performance shortcut.
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return ext->IsSloppyBlockWithEvalContextExtension()
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|| ScopeInfo::cast(ext)->is_declaration_scope();
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}
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Context* Context::declaration_context() {
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Context* current = this;
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while (!current->is_declaration_context()) {
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current = current->previous();
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DCHECK(current->closure() == closure());
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}
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return current;
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}
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JSObject* Context::extension_object() {
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DCHECK(IsNativeContext() || IsFunctionContext() || IsBlockContext());
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HeapObject* object = extension();
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if (object->IsTheHole()) return nullptr;
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if (IsBlockContext()) {
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if (!object->IsSloppyBlockWithEvalContextExtension()) return nullptr;
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object = SloppyBlockWithEvalContextExtension::cast(object)->extension();
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}
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DCHECK(object->IsJSContextExtensionObject() ||
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(IsNativeContext() && object->IsJSGlobalObject()));
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return JSObject::cast(object);
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}
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JSReceiver* Context::extension_receiver() {
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DCHECK(IsNativeContext() || IsWithContext() ||
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IsFunctionContext() || IsBlockContext());
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return IsWithContext() ? JSReceiver::cast(extension()) : extension_object();
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}
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ScopeInfo* Context::scope_info() {
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DCHECK(IsModuleContext() || IsScriptContext() || IsBlockContext());
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HeapObject* object = extension();
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if (object->IsSloppyBlockWithEvalContextExtension()) {
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DCHECK(IsBlockContext());
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object = SloppyBlockWithEvalContextExtension::cast(object)->scope_info();
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}
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return ScopeInfo::cast(object);
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}
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String* Context::catch_name() {
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DCHECK(IsCatchContext());
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return String::cast(extension());
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}
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JSGlobalObject* Context::global_object() {
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return JSGlobalObject::cast(native_context()->extension());
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}
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Context* Context::script_context() {
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Context* current = this;
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while (!current->IsScriptContext()) {
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current = current->previous();
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}
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return current;
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}
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JSObject* Context::global_proxy() {
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return native_context()->global_proxy_object();
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}
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void Context::set_global_proxy(JSObject* object) {
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native_context()->set_global_proxy_object(object);
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}
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/**
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* Lookups a property in an object environment, taking the unscopables into
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* account. This is used For HasBinding spec algorithms for ObjectEnvironment.
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*/
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static Maybe<bool> UnscopableLookup(LookupIterator* it) {
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Isolate* isolate = it->isolate();
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Maybe<bool> found = JSReceiver::HasProperty(it);
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if (!found.IsJust() || !found.FromJust()) return found;
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Handle<Object> unscopables;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate, unscopables,
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Object::GetProperty(it->GetReceiver(),
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isolate->factory()->unscopables_symbol()),
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Nothing<bool>());
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if (!unscopables->IsJSReceiver()) return Just(true);
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Handle<Object> blacklist;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, blacklist,
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Object::GetProperty(unscopables, it->name()),
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Nothing<bool>());
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return Just(!blacklist->BooleanValue());
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}
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static void GetAttributesAndBindingFlags(VariableMode mode,
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InitializationFlag init_flag,
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PropertyAttributes* attributes,
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BindingFlags* binding_flags) {
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switch (mode) {
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case VAR:
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*attributes = NONE;
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*binding_flags = MUTABLE_IS_INITIALIZED;
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break;
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case LET:
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*attributes = NONE;
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*binding_flags = (init_flag == kNeedsInitialization)
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? MUTABLE_CHECK_INITIALIZED
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: MUTABLE_IS_INITIALIZED;
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break;
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case CONST_LEGACY:
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*attributes = READ_ONLY;
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*binding_flags = (init_flag == kNeedsInitialization)
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? IMMUTABLE_CHECK_INITIALIZED
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: IMMUTABLE_IS_INITIALIZED;
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break;
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case CONST:
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*attributes = READ_ONLY;
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*binding_flags = (init_flag == kNeedsInitialization)
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? IMMUTABLE_CHECK_INITIALIZED_HARMONY
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: IMMUTABLE_IS_INITIALIZED_HARMONY;
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break;
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case IMPORT:
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// TODO(ES6)
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UNREACHABLE();
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break;
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case DYNAMIC:
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case DYNAMIC_GLOBAL:
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case DYNAMIC_LOCAL:
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case TEMPORARY:
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// Note: Fixed context slots are statically allocated by the compiler.
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// Statically allocated variables always have a statically known mode,
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// which is the mode with which they were declared when added to the
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// scope. Thus, the DYNAMIC mode (which corresponds to dynamically
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// declared variables that were introduced through declaration nodes)
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// must not appear here.
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UNREACHABLE();
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break;
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}
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}
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Handle<Object> Context::Lookup(Handle<String> name,
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ContextLookupFlags flags,
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int* index,
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PropertyAttributes* attributes,
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BindingFlags* binding_flags) {
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Isolate* isolate = GetIsolate();
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Handle<Context> context(this, isolate);
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bool follow_context_chain = (flags & FOLLOW_CONTEXT_CHAIN) != 0;
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*index = kNotFound;
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*attributes = ABSENT;
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*binding_flags = MISSING_BINDING;
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if (FLAG_trace_contexts) {
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PrintF("Context::Lookup(");
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name->ShortPrint();
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PrintF(")\n");
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}
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do {
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if (FLAG_trace_contexts) {
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PrintF(" - looking in context %p", reinterpret_cast<void*>(*context));
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if (context->IsScriptContext()) PrintF(" (script context)");
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if (context->IsNativeContext()) PrintF(" (native context)");
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PrintF("\n");
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}
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// 1. Check global objects, subjects of with, and extension objects.
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if ((context->IsNativeContext() ||
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(context->IsWithContext() && ((flags & SKIP_WITH_CONTEXT) == 0)) ||
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context->IsFunctionContext() || context->IsBlockContext()) &&
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context->extension_receiver() != nullptr) {
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Handle<JSReceiver> object(context->extension_receiver());
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if (context->IsNativeContext()) {
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if (FLAG_trace_contexts) {
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PrintF(" - trying other script contexts\n");
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}
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// Try other script contexts.
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Handle<ScriptContextTable> script_contexts(
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context->global_object()->native_context()->script_context_table());
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ScriptContextTable::LookupResult r;
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if (ScriptContextTable::Lookup(script_contexts, name, &r)) {
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if (FLAG_trace_contexts) {
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Handle<Context> c = ScriptContextTable::GetContext(script_contexts,
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r.context_index);
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PrintF("=> found property in script context %d: %p\n",
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r.context_index, reinterpret_cast<void*>(*c));
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}
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*index = r.slot_index;
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GetAttributesAndBindingFlags(r.mode, r.init_flag, attributes,
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binding_flags);
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return ScriptContextTable::GetContext(script_contexts,
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r.context_index);
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}
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}
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// Context extension objects needs to behave as if they have no
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// prototype. So even if we want to follow prototype chains, we need
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// to only do a local lookup for context extension objects.
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Maybe<PropertyAttributes> maybe = Nothing<PropertyAttributes>();
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if ((flags & FOLLOW_PROTOTYPE_CHAIN) == 0 ||
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object->IsJSContextExtensionObject()) {
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maybe = JSReceiver::GetOwnPropertyAttributes(object, name);
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} else if (context->IsWithContext()) {
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// A with context will never bind "this".
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if (name->Equals(*isolate->factory()->this_string())) {
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maybe = Just(ABSENT);
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} else {
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LookupIterator it(object, name);
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Maybe<bool> found = UnscopableLookup(&it);
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if (found.IsNothing()) {
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maybe = Nothing<PropertyAttributes>();
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} else {
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// Luckily, consumers of |maybe| only care whether the property
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// was absent or not, so we can return a dummy |NONE| value
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// for its attributes when it was present.
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maybe = Just(found.FromJust() ? NONE : ABSENT);
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}
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}
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} else {
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maybe = JSReceiver::GetPropertyAttributes(object, name);
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}
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if (!maybe.IsJust()) return Handle<Object>();
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DCHECK(!isolate->has_pending_exception());
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*attributes = maybe.FromJust();
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if (maybe.FromJust() != ABSENT) {
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if (FLAG_trace_contexts) {
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PrintF("=> found property in context object %p\n",
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reinterpret_cast<void*>(*object));
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}
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return object;
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}
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}
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// 2. Check the context proper if it has slots.
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if (context->IsFunctionContext() || context->IsBlockContext() ||
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context->IsScriptContext()) {
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// Use serialized scope information of functions and blocks to search
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// for the context index.
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Handle<ScopeInfo> scope_info(context->IsFunctionContext()
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? context->closure()->shared()->scope_info()
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: context->scope_info());
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VariableMode mode;
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InitializationFlag init_flag;
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// TODO(sigurds) Figure out whether maybe_assigned_flag should
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// be used to compute binding_flags.
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MaybeAssignedFlag maybe_assigned_flag;
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int slot_index = ScopeInfo::ContextSlotIndex(
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scope_info, name, &mode, &init_flag, &maybe_assigned_flag);
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DCHECK(slot_index < 0 || slot_index >= MIN_CONTEXT_SLOTS);
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if (slot_index >= 0) {
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if (FLAG_trace_contexts) {
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PrintF("=> found local in context slot %d (mode = %d)\n",
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slot_index, mode);
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}
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*index = slot_index;
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GetAttributesAndBindingFlags(mode, init_flag, attributes,
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binding_flags);
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return context;
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}
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// Check the slot corresponding to the intermediate context holding
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// only the function name variable.
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if (follow_context_chain && context->IsFunctionContext()) {
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VariableMode mode;
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int function_index = scope_info->FunctionContextSlotIndex(*name, &mode);
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if (function_index >= 0) {
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if (FLAG_trace_contexts) {
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PrintF("=> found intermediate function in context slot %d\n",
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function_index);
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}
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*index = function_index;
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*attributes = READ_ONLY;
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DCHECK(mode == CONST_LEGACY || mode == CONST);
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*binding_flags = (mode == CONST_LEGACY)
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? IMMUTABLE_IS_INITIALIZED : IMMUTABLE_IS_INITIALIZED_HARMONY;
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return context;
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}
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}
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} else if (context->IsCatchContext()) {
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// Catch contexts have the variable name in the extension slot.
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if (String::Equals(name, handle(context->catch_name()))) {
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if (FLAG_trace_contexts) {
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PrintF("=> found in catch context\n");
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}
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*index = Context::THROWN_OBJECT_INDEX;
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*attributes = NONE;
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*binding_flags = MUTABLE_IS_INITIALIZED;
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return context;
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}
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}
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// 3. Prepare to continue with the previous (next outermost) context.
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if (context->IsNativeContext() ||
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((flags & STOP_AT_DECLARATION_SCOPE) != 0 &&
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context->is_declaration_context())) {
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follow_context_chain = false;
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} else {
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context = Handle<Context>(context->previous(), isolate);
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}
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} while (follow_context_chain);
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if (FLAG_trace_contexts) {
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PrintF("=> no property/slot found\n");
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}
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return Handle<Object>::null();
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}
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void Context::InitializeGlobalSlots() {
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DCHECK(IsScriptContext());
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DisallowHeapAllocation no_gc;
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ScopeInfo* scope_info = this->scope_info();
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int context_globals = scope_info->ContextGlobalCount();
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if (context_globals > 0) {
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PropertyCell* empty_cell = GetHeap()->empty_property_cell();
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int context_locals = scope_info->ContextLocalCount();
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int index = Context::MIN_CONTEXT_SLOTS + context_locals;
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for (int i = 0; i < context_globals; i++) {
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set(index++, empty_cell);
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}
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}
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}
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void Context::AddOptimizedFunction(JSFunction* function) {
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DCHECK(IsNativeContext());
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#ifdef ENABLE_SLOW_DCHECKS
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if (FLAG_enable_slow_asserts) {
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Object* element = get(OPTIMIZED_FUNCTIONS_LIST);
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while (!element->IsUndefined()) {
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CHECK(element != function);
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element = JSFunction::cast(element)->next_function_link();
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}
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}
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// Check that the context belongs to the weak native contexts list.
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bool found = false;
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Object* context = GetHeap()->native_contexts_list();
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while (!context->IsUndefined()) {
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if (context == this) {
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found = true;
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break;
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}
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context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK);
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}
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CHECK(found);
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#endif
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// If the function link field is already used then the function was
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// enqueued as a code flushing candidate and we remove it now.
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if (!function->next_function_link()->IsUndefined()) {
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CodeFlusher* flusher = GetHeap()->mark_compact_collector()->code_flusher();
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flusher->EvictCandidate(function);
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}
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DCHECK(function->next_function_link()->IsUndefined());
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function->set_next_function_link(get(OPTIMIZED_FUNCTIONS_LIST),
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UPDATE_WEAK_WRITE_BARRIER);
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set(OPTIMIZED_FUNCTIONS_LIST, function, UPDATE_WEAK_WRITE_BARRIER);
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}
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void Context::RemoveOptimizedFunction(JSFunction* function) {
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DCHECK(IsNativeContext());
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Object* element = get(OPTIMIZED_FUNCTIONS_LIST);
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JSFunction* prev = NULL;
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while (!element->IsUndefined()) {
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JSFunction* element_function = JSFunction::cast(element);
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DCHECK(element_function->next_function_link()->IsUndefined() ||
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element_function->next_function_link()->IsJSFunction());
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if (element_function == function) {
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if (prev == NULL) {
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set(OPTIMIZED_FUNCTIONS_LIST, element_function->next_function_link(),
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UPDATE_WEAK_WRITE_BARRIER);
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} else {
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prev->set_next_function_link(element_function->next_function_link(),
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UPDATE_WEAK_WRITE_BARRIER);
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}
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element_function->set_next_function_link(GetHeap()->undefined_value(),
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UPDATE_WEAK_WRITE_BARRIER);
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return;
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}
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prev = element_function;
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element = element_function->next_function_link();
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}
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UNREACHABLE();
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}
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void Context::SetOptimizedFunctionsListHead(Object* head) {
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DCHECK(IsNativeContext());
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set(OPTIMIZED_FUNCTIONS_LIST, head, UPDATE_WEAK_WRITE_BARRIER);
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}
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Object* Context::OptimizedFunctionsListHead() {
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DCHECK(IsNativeContext());
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return get(OPTIMIZED_FUNCTIONS_LIST);
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}
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void Context::AddOptimizedCode(Code* code) {
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DCHECK(IsNativeContext());
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DCHECK(code->kind() == Code::OPTIMIZED_FUNCTION);
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DCHECK(code->next_code_link()->IsUndefined());
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code->set_next_code_link(get(OPTIMIZED_CODE_LIST));
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set(OPTIMIZED_CODE_LIST, code, UPDATE_WEAK_WRITE_BARRIER);
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}
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void Context::SetOptimizedCodeListHead(Object* head) {
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DCHECK(IsNativeContext());
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set(OPTIMIZED_CODE_LIST, head, UPDATE_WEAK_WRITE_BARRIER);
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}
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Object* Context::OptimizedCodeListHead() {
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DCHECK(IsNativeContext());
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return get(OPTIMIZED_CODE_LIST);
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}
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void Context::SetDeoptimizedCodeListHead(Object* head) {
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DCHECK(IsNativeContext());
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set(DEOPTIMIZED_CODE_LIST, head, UPDATE_WEAK_WRITE_BARRIER);
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}
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Object* Context::DeoptimizedCodeListHead() {
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DCHECK(IsNativeContext());
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return get(DEOPTIMIZED_CODE_LIST);
|
|
}
|
|
|
|
|
|
Handle<Object> Context::ErrorMessageForCodeGenerationFromStrings() {
|
|
Isolate* isolate = GetIsolate();
|
|
Handle<Object> result(error_message_for_code_gen_from_strings(), isolate);
|
|
if (!result->IsUndefined()) return result;
|
|
return isolate->factory()->NewStringFromStaticChars(
|
|
"Code generation from strings disallowed for this context");
|
|
}
|
|
|
|
|
|
#define COMPARE_NAME(index, type, name) \
|
|
if (string->IsOneByteEqualTo(STATIC_CHAR_VECTOR(#name))) return index;
|
|
|
|
int Context::ImportedFieldIndexForName(Handle<String> string) {
|
|
NATIVE_CONTEXT_IMPORTED_FIELDS(COMPARE_NAME)
|
|
return kNotFound;
|
|
}
|
|
|
|
|
|
int Context::IntrinsicIndexForName(Handle<String> string) {
|
|
NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(COMPARE_NAME);
|
|
return kNotFound;
|
|
}
|
|
|
|
#undef COMPARE_NAME
|
|
|
|
|
|
bool Context::IsJSBuiltin(Handle<Context> native_context,
|
|
Handle<JSFunction> function) {
|
|
#define COMPARE_FUNCTION(index, type, name) \
|
|
if (*function == native_context->get(index)) return true;
|
|
NATIVE_CONTEXT_JS_BUILTINS(COMPARE_FUNCTION);
|
|
#undef COMPARE_FUNCTION
|
|
return false;
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
|
|
bool Context::IsBootstrappingOrNativeContext(Isolate* isolate, Object* object) {
|
|
// During bootstrapping we allow all objects to pass as global
|
|
// objects. This is necessary to fix circular dependencies.
|
|
return isolate->heap()->gc_state() != Heap::NOT_IN_GC ||
|
|
isolate->bootstrapper()->IsActive() || object->IsNativeContext();
|
|
}
|
|
|
|
|
|
bool Context::IsBootstrappingOrValidParentContext(
|
|
Object* object, Context* child) {
|
|
// During bootstrapping we allow all objects to pass as
|
|
// contexts. This is necessary to fix circular dependencies.
|
|
if (child->GetIsolate()->bootstrapper()->IsActive()) return true;
|
|
if (!object->IsContext()) return false;
|
|
Context* context = Context::cast(object);
|
|
return context->IsNativeContext() || context->IsScriptContext() ||
|
|
context->IsModuleContext() || !child->IsModuleContext();
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
void Context::IncrementErrorsThrown() {
|
|
DCHECK(IsNativeContext());
|
|
|
|
int previous_value = errors_thrown()->value();
|
|
set_errors_thrown(Smi::FromInt(previous_value + 1));
|
|
}
|
|
|
|
|
|
int Context::GetErrorsThrown() { return errors_thrown()->value(); }
|
|
|
|
} // namespace internal
|
|
} // namespace v8
|