d932b5f768
Patch by Dmitry Lomov. pthreads implementations are free to reuse pthread_t (thread id) after the thread has died. This change gets rid of ThreadHandle class and replaces it with v8-managed thread identifiers. git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7575 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
964 lines
34 KiB
C++
964 lines
34 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 "compiler.h"
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#include "debug.h"
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#include "execution.h"
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#include "messages.h"
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#include "platform.h"
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#include "simulator.h"
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#include "string-stream.h"
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#include "vm-state-inl.h"
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// TODO(isolates): move to isolate.cc. This stuff is kept here to
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// simplify merging.
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namespace v8 {
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namespace internal {
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v8::TryCatch* ThreadLocalTop::TryCatchHandler() {
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return TRY_CATCH_FROM_ADDRESS(try_catch_handler_address());
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}
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void ThreadLocalTop::Initialize() {
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c_entry_fp_ = 0;
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handler_ = 0;
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#ifdef USE_SIMULATOR
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#ifdef V8_TARGET_ARCH_ARM
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simulator_ = Simulator::current(Isolate::Current());
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#elif V8_TARGET_ARCH_MIPS
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simulator_ = Simulator::current(Isolate::Current());
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#endif
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#endif
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#ifdef ENABLE_LOGGING_AND_PROFILING
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js_entry_sp_ = NULL;
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external_callback_ = NULL;
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#endif
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#ifdef ENABLE_VMSTATE_TRACKING
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current_vm_state_ = EXTERNAL;
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#endif
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try_catch_handler_address_ = NULL;
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context_ = NULL;
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thread_id_ = ThreadId::Current();
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external_caught_exception_ = false;
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failed_access_check_callback_ = NULL;
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save_context_ = NULL;
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catcher_ = NULL;
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}
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Address Isolate::get_address_from_id(Isolate::AddressId id) {
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return isolate_addresses_[id];
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}
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char* Isolate::Iterate(ObjectVisitor* v, char* thread_storage) {
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ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage);
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Iterate(v, thread);
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return thread_storage + sizeof(ThreadLocalTop);
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}
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void Isolate::IterateThread(ThreadVisitor* v) {
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v->VisitThread(this, thread_local_top());
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}
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void Isolate::IterateThread(ThreadVisitor* v, char* t) {
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ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(t);
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v->VisitThread(this, thread);
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}
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void Isolate::Iterate(ObjectVisitor* v, ThreadLocalTop* thread) {
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// Visit the roots from the top for a given thread.
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Object* pending;
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// The pending exception can sometimes be a failure. We can't show
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// that to the GC, which only understands objects.
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if (thread->pending_exception_->ToObject(&pending)) {
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v->VisitPointer(&pending);
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thread->pending_exception_ = pending; // In case GC updated it.
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}
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v->VisitPointer(&(thread->pending_message_obj_));
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v->VisitPointer(BitCast<Object**>(&(thread->pending_message_script_)));
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v->VisitPointer(BitCast<Object**>(&(thread->context_)));
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Object* scheduled;
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if (thread->scheduled_exception_->ToObject(&scheduled)) {
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v->VisitPointer(&scheduled);
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thread->scheduled_exception_ = scheduled;
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}
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for (v8::TryCatch* block = thread->TryCatchHandler();
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block != NULL;
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block = TRY_CATCH_FROM_ADDRESS(block->next_)) {
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v->VisitPointer(BitCast<Object**>(&(block->exception_)));
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v->VisitPointer(BitCast<Object**>(&(block->message_)));
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}
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// Iterate over pointers on native execution stack.
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for (StackFrameIterator it(this, thread); !it.done(); it.Advance()) {
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it.frame()->Iterate(v);
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}
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}
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void Isolate::Iterate(ObjectVisitor* v) {
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ThreadLocalTop* current_t = thread_local_top();
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Iterate(v, current_t);
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}
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void Isolate::RegisterTryCatchHandler(v8::TryCatch* that) {
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// The ARM simulator has a separate JS stack. We therefore register
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// the C++ try catch handler with the simulator and get back an
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// address that can be used for comparisons with addresses into the
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// JS stack. When running without the simulator, the address
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// returned will be the address of the C++ try catch handler itself.
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Address address = reinterpret_cast<Address>(
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SimulatorStack::RegisterCTryCatch(reinterpret_cast<uintptr_t>(that)));
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thread_local_top()->set_try_catch_handler_address(address);
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}
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void Isolate::UnregisterTryCatchHandler(v8::TryCatch* that) {
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ASSERT(thread_local_top()->TryCatchHandler() == that);
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thread_local_top()->set_try_catch_handler_address(
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reinterpret_cast<Address>(that->next_));
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thread_local_top()->catcher_ = NULL;
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SimulatorStack::UnregisterCTryCatch();
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}
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Handle<String> Isolate::StackTraceString() {
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if (stack_trace_nesting_level_ == 0) {
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stack_trace_nesting_level_++;
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HeapStringAllocator allocator;
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StringStream::ClearMentionedObjectCache();
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StringStream accumulator(&allocator);
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incomplete_message_ = &accumulator;
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PrintStack(&accumulator);
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Handle<String> stack_trace = accumulator.ToString();
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incomplete_message_ = NULL;
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stack_trace_nesting_level_ = 0;
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return stack_trace;
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} else if (stack_trace_nesting_level_ == 1) {
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stack_trace_nesting_level_++;
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OS::PrintError(
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"\n\nAttempt to print stack while printing stack (double fault)\n");
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OS::PrintError(
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"If you are lucky you may find a partial stack dump on stdout.\n\n");
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incomplete_message_->OutputToStdOut();
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return factory()->empty_symbol();
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} else {
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OS::Abort();
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// Unreachable
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return factory()->empty_symbol();
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}
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}
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Handle<JSArray> Isolate::CaptureCurrentStackTrace(
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int frame_limit, StackTrace::StackTraceOptions options) {
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// Ensure no negative values.
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int limit = Max(frame_limit, 0);
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Handle<JSArray> stack_trace = factory()->NewJSArray(frame_limit);
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Handle<String> column_key = factory()->LookupAsciiSymbol("column");
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Handle<String> line_key = factory()->LookupAsciiSymbol("lineNumber");
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Handle<String> script_key = factory()->LookupAsciiSymbol("scriptName");
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Handle<String> name_or_source_url_key =
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factory()->LookupAsciiSymbol("nameOrSourceURL");
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Handle<String> script_name_or_source_url_key =
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factory()->LookupAsciiSymbol("scriptNameOrSourceURL");
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Handle<String> function_key = factory()->LookupAsciiSymbol("functionName");
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Handle<String> eval_key = factory()->LookupAsciiSymbol("isEval");
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Handle<String> constructor_key =
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factory()->LookupAsciiSymbol("isConstructor");
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StackTraceFrameIterator it(this);
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int frames_seen = 0;
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while (!it.done() && (frames_seen < limit)) {
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JavaScriptFrame* frame = it.frame();
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// Set initial size to the maximum inlining level + 1 for the outermost
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// function.
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List<FrameSummary> frames(Compiler::kMaxInliningLevels + 1);
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frame->Summarize(&frames);
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for (int i = frames.length() - 1; i >= 0 && frames_seen < limit; i--) {
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// Create a JSObject to hold the information for the StackFrame.
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Handle<JSObject> stackFrame = factory()->NewJSObject(object_function());
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Handle<JSFunction> fun = frames[i].function();
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Handle<Script> script(Script::cast(fun->shared()->script()));
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if (options & StackTrace::kLineNumber) {
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int script_line_offset = script->line_offset()->value();
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int position = frames[i].code()->SourcePosition(frames[i].pc());
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int line_number = GetScriptLineNumber(script, position);
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// line_number is already shifted by the script_line_offset.
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int relative_line_number = line_number - script_line_offset;
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if (options & StackTrace::kColumnOffset && relative_line_number >= 0) {
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Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends()));
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int start = (relative_line_number == 0) ? 0 :
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Smi::cast(line_ends->get(relative_line_number - 1))->value() + 1;
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int column_offset = position - start;
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if (relative_line_number == 0) {
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// For the case where the code is on the same line as the script
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// tag.
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column_offset += script->column_offset()->value();
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}
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SetLocalPropertyNoThrow(stackFrame, column_key,
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Handle<Smi>(Smi::FromInt(column_offset + 1)));
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}
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SetLocalPropertyNoThrow(stackFrame, line_key,
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Handle<Smi>(Smi::FromInt(line_number + 1)));
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}
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if (options & StackTrace::kScriptName) {
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Handle<Object> script_name(script->name(), this);
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SetLocalPropertyNoThrow(stackFrame, script_key, script_name);
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}
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if (options & StackTrace::kScriptNameOrSourceURL) {
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Handle<Object> script_name(script->name(), this);
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Handle<JSValue> script_wrapper = GetScriptWrapper(script);
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Handle<Object> property = GetProperty(script_wrapper,
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name_or_source_url_key);
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ASSERT(property->IsJSFunction());
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Handle<JSFunction> method = Handle<JSFunction>::cast(property);
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bool caught_exception;
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Handle<Object> result = Execution::TryCall(method, script_wrapper, 0,
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NULL, &caught_exception);
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if (caught_exception) {
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result = factory()->undefined_value();
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}
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SetLocalPropertyNoThrow(stackFrame, script_name_or_source_url_key,
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result);
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}
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if (options & StackTrace::kFunctionName) {
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Handle<Object> fun_name(fun->shared()->name(), this);
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if (fun_name->ToBoolean()->IsFalse()) {
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fun_name = Handle<Object>(fun->shared()->inferred_name(), this);
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}
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SetLocalPropertyNoThrow(stackFrame, function_key, fun_name);
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}
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if (options & StackTrace::kIsEval) {
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int type = Smi::cast(script->compilation_type())->value();
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Handle<Object> is_eval = (type == Script::COMPILATION_TYPE_EVAL) ?
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factory()->true_value() : factory()->false_value();
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SetLocalPropertyNoThrow(stackFrame, eval_key, is_eval);
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}
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if (options & StackTrace::kIsConstructor) {
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Handle<Object> is_constructor = (frames[i].is_constructor()) ?
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factory()->true_value() : factory()->false_value();
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SetLocalPropertyNoThrow(stackFrame, constructor_key, is_constructor);
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}
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FixedArray::cast(stack_trace->elements())->set(frames_seen, *stackFrame);
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frames_seen++;
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}
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it.Advance();
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}
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stack_trace->set_length(Smi::FromInt(frames_seen));
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return stack_trace;
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}
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void Isolate::PrintStack() {
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if (stack_trace_nesting_level_ == 0) {
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stack_trace_nesting_level_++;
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StringAllocator* allocator;
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if (preallocated_message_space_ == NULL) {
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allocator = new HeapStringAllocator();
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} else {
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allocator = preallocated_message_space_;
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}
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StringStream::ClearMentionedObjectCache();
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StringStream accumulator(allocator);
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incomplete_message_ = &accumulator;
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PrintStack(&accumulator);
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accumulator.OutputToStdOut();
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accumulator.Log();
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incomplete_message_ = NULL;
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stack_trace_nesting_level_ = 0;
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if (preallocated_message_space_ == NULL) {
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// Remove the HeapStringAllocator created above.
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delete allocator;
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}
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} else if (stack_trace_nesting_level_ == 1) {
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stack_trace_nesting_level_++;
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OS::PrintError(
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"\n\nAttempt to print stack while printing stack (double fault)\n");
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OS::PrintError(
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"If you are lucky you may find a partial stack dump on stdout.\n\n");
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incomplete_message_->OutputToStdOut();
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}
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}
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static void PrintFrames(StringStream* accumulator,
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StackFrame::PrintMode mode) {
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StackFrameIterator it;
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for (int i = 0; !it.done(); it.Advance()) {
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it.frame()->Print(accumulator, mode, i++);
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}
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}
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void Isolate::PrintStack(StringStream* accumulator) {
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if (!IsInitialized()) {
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accumulator->Add(
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"\n==== Stack trace is not available ==========================\n\n");
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accumulator->Add(
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"\n==== Isolate for the thread is not initialized =============\n\n");
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return;
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}
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// The MentionedObjectCache is not GC-proof at the moment.
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AssertNoAllocation nogc;
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ASSERT(StringStream::IsMentionedObjectCacheClear());
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// Avoid printing anything if there are no frames.
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if (c_entry_fp(thread_local_top()) == 0) return;
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accumulator->Add(
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"\n==== Stack trace ============================================\n\n");
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PrintFrames(accumulator, StackFrame::OVERVIEW);
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accumulator->Add(
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"\n==== Details ================================================\n\n");
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PrintFrames(accumulator, StackFrame::DETAILS);
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accumulator->PrintMentionedObjectCache();
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accumulator->Add("=====================\n\n");
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}
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void Isolate::SetFailedAccessCheckCallback(
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v8::FailedAccessCheckCallback callback) {
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thread_local_top()->failed_access_check_callback_ = callback;
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}
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void Isolate::ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type) {
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if (!thread_local_top()->failed_access_check_callback_) return;
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ASSERT(receiver->IsAccessCheckNeeded());
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ASSERT(context());
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// Get the data object from access check info.
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JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
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if (!constructor->shared()->IsApiFunction()) return;
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Object* data_obj =
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constructor->shared()->get_api_func_data()->access_check_info();
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if (data_obj == heap_.undefined_value()) return;
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HandleScope scope;
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Handle<JSObject> receiver_handle(receiver);
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Handle<Object> data(AccessCheckInfo::cast(data_obj)->data());
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thread_local_top()->failed_access_check_callback_(
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v8::Utils::ToLocal(receiver_handle),
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type,
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v8::Utils::ToLocal(data));
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}
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enum MayAccessDecision {
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YES, NO, UNKNOWN
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};
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static MayAccessDecision MayAccessPreCheck(Isolate* isolate,
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JSObject* receiver,
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v8::AccessType type) {
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// During bootstrapping, callback functions are not enabled yet.
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if (isolate->bootstrapper()->IsActive()) return YES;
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if (receiver->IsJSGlobalProxy()) {
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Object* receiver_context = JSGlobalProxy::cast(receiver)->context();
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if (!receiver_context->IsContext()) return NO;
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// Get the global context of current top context.
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// avoid using Isolate::global_context() because it uses Handle.
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Context* global_context = isolate->context()->global()->global_context();
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if (receiver_context == global_context) return YES;
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if (Context::cast(receiver_context)->security_token() ==
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global_context->security_token())
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return YES;
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}
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return UNKNOWN;
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}
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bool Isolate::MayNamedAccess(JSObject* receiver, Object* key,
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v8::AccessType type) {
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ASSERT(receiver->IsAccessCheckNeeded());
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// The callers of this method are not expecting a GC.
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AssertNoAllocation no_gc;
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// Skip checks for hidden properties access. Note, we do not
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// require existence of a context in this case.
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if (key == heap_.hidden_symbol()) return true;
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// Check for compatibility between the security tokens in the
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// current lexical context and the accessed object.
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ASSERT(context());
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MayAccessDecision decision = MayAccessPreCheck(this, receiver, type);
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if (decision != UNKNOWN) return decision == YES;
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// Get named access check callback
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JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
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if (!constructor->shared()->IsApiFunction()) return false;
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Object* data_obj =
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constructor->shared()->get_api_func_data()->access_check_info();
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if (data_obj == heap_.undefined_value()) return false;
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Object* fun_obj = AccessCheckInfo::cast(data_obj)->named_callback();
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v8::NamedSecurityCallback callback =
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v8::ToCData<v8::NamedSecurityCallback>(fun_obj);
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if (!callback) return false;
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HandleScope scope(this);
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Handle<JSObject> receiver_handle(receiver, this);
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Handle<Object> key_handle(key, this);
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Handle<Object> data(AccessCheckInfo::cast(data_obj)->data(), this);
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LOG(this, ApiNamedSecurityCheck(key));
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bool result = false;
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{
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// Leaving JavaScript.
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VMState state(this, EXTERNAL);
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result = callback(v8::Utils::ToLocal(receiver_handle),
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v8::Utils::ToLocal(key_handle),
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type,
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v8::Utils::ToLocal(data));
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}
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return result;
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}
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bool Isolate::MayIndexedAccess(JSObject* receiver,
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uint32_t index,
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v8::AccessType type) {
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ASSERT(receiver->IsAccessCheckNeeded());
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// Check for compatibility between the security tokens in the
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// current lexical context and the accessed object.
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ASSERT(context());
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MayAccessDecision decision = MayAccessPreCheck(this, receiver, type);
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if (decision != UNKNOWN) return decision == YES;
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// Get indexed access check callback
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|
JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
|
|
if (!constructor->shared()->IsApiFunction()) return false;
|
|
|
|
Object* data_obj =
|
|
constructor->shared()->get_api_func_data()->access_check_info();
|
|
if (data_obj == heap_.undefined_value()) return false;
|
|
|
|
Object* fun_obj = AccessCheckInfo::cast(data_obj)->indexed_callback();
|
|
v8::IndexedSecurityCallback callback =
|
|
v8::ToCData<v8::IndexedSecurityCallback>(fun_obj);
|
|
|
|
if (!callback) return false;
|
|
|
|
HandleScope scope(this);
|
|
Handle<JSObject> receiver_handle(receiver, this);
|
|
Handle<Object> data(AccessCheckInfo::cast(data_obj)->data(), this);
|
|
LOG(this, ApiIndexedSecurityCheck(index));
|
|
bool result = false;
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState state(this, EXTERNAL);
|
|
result = callback(v8::Utils::ToLocal(receiver_handle),
|
|
index,
|
|
type,
|
|
v8::Utils::ToLocal(data));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
const char* const Isolate::kStackOverflowMessage =
|
|
"Uncaught RangeError: Maximum call stack size exceeded";
|
|
|
|
|
|
Failure* Isolate::StackOverflow() {
|
|
HandleScope scope;
|
|
Handle<String> key = factory()->stack_overflow_symbol();
|
|
Handle<JSObject> boilerplate =
|
|
Handle<JSObject>::cast(GetProperty(js_builtins_object(), key));
|
|
Handle<Object> exception = Copy(boilerplate);
|
|
// TODO(1240995): To avoid having to call JavaScript code to compute
|
|
// the message for stack overflow exceptions which is very likely to
|
|
// double fault with another stack overflow exception, we use a
|
|
// precomputed message.
|
|
DoThrow(*exception, NULL);
|
|
return Failure::Exception();
|
|
}
|
|
|
|
|
|
Failure* Isolate::TerminateExecution() {
|
|
DoThrow(heap_.termination_exception(), NULL);
|
|
return Failure::Exception();
|
|
}
|
|
|
|
|
|
Failure* Isolate::Throw(Object* exception, MessageLocation* location) {
|
|
DoThrow(exception, location);
|
|
return Failure::Exception();
|
|
}
|
|
|
|
|
|
Failure* Isolate::ReThrow(MaybeObject* exception, MessageLocation* location) {
|
|
bool can_be_caught_externally = false;
|
|
ShouldReportException(&can_be_caught_externally,
|
|
is_catchable_by_javascript(exception));
|
|
thread_local_top()->catcher_ = can_be_caught_externally ?
|
|
try_catch_handler() : NULL;
|
|
|
|
// Set the exception being re-thrown.
|
|
set_pending_exception(exception);
|
|
return Failure::Exception();
|
|
}
|
|
|
|
|
|
Failure* Isolate::ThrowIllegalOperation() {
|
|
return Throw(heap_.illegal_access_symbol());
|
|
}
|
|
|
|
|
|
void Isolate::ScheduleThrow(Object* exception) {
|
|
// When scheduling a throw we first throw the exception to get the
|
|
// error reporting if it is uncaught before rescheduling it.
|
|
Throw(exception);
|
|
thread_local_top()->scheduled_exception_ = pending_exception();
|
|
thread_local_top()->external_caught_exception_ = false;
|
|
clear_pending_exception();
|
|
}
|
|
|
|
|
|
Failure* Isolate::PromoteScheduledException() {
|
|
MaybeObject* thrown = scheduled_exception();
|
|
clear_scheduled_exception();
|
|
// Re-throw the exception to avoid getting repeated error reporting.
|
|
return ReThrow(thrown);
|
|
}
|
|
|
|
|
|
void Isolate::PrintCurrentStackTrace(FILE* out) {
|
|
StackTraceFrameIterator it(this);
|
|
while (!it.done()) {
|
|
HandleScope scope;
|
|
// Find code position if recorded in relocation info.
|
|
JavaScriptFrame* frame = it.frame();
|
|
int pos = frame->LookupCode()->SourcePosition(frame->pc());
|
|
Handle<Object> pos_obj(Smi::FromInt(pos));
|
|
// Fetch function and receiver.
|
|
Handle<JSFunction> fun(JSFunction::cast(frame->function()));
|
|
Handle<Object> recv(frame->receiver());
|
|
// Advance to the next JavaScript frame and determine if the
|
|
// current frame is the top-level frame.
|
|
it.Advance();
|
|
Handle<Object> is_top_level = it.done()
|
|
? factory()->true_value()
|
|
: factory()->false_value();
|
|
// Generate and print stack trace line.
|
|
Handle<String> line =
|
|
Execution::GetStackTraceLine(recv, fun, pos_obj, is_top_level);
|
|
if (line->length() > 0) {
|
|
line->PrintOn(out);
|
|
fprintf(out, "\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::ComputeLocation(MessageLocation* target) {
|
|
*target = MessageLocation(Handle<Script>(heap_.empty_script()), -1, -1);
|
|
StackTraceFrameIterator it(this);
|
|
if (!it.done()) {
|
|
JavaScriptFrame* frame = it.frame();
|
|
JSFunction* fun = JSFunction::cast(frame->function());
|
|
Object* script = fun->shared()->script();
|
|
if (script->IsScript() &&
|
|
!(Script::cast(script)->source()->IsUndefined())) {
|
|
int pos = frame->LookupCode()->SourcePosition(frame->pc());
|
|
// Compute the location from the function and the reloc info.
|
|
Handle<Script> casted_script(Script::cast(script));
|
|
*target = MessageLocation(casted_script, pos, pos + 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
bool Isolate::ShouldReportException(bool* can_be_caught_externally,
|
|
bool catchable_by_javascript) {
|
|
// Find the top-most try-catch handler.
|
|
StackHandler* handler =
|
|
StackHandler::FromAddress(Isolate::handler(thread_local_top()));
|
|
while (handler != NULL && !handler->is_try_catch()) {
|
|
handler = handler->next();
|
|
}
|
|
|
|
// Get the address of the external handler so we can compare the address to
|
|
// determine which one is closer to the top of the stack.
|
|
Address external_handler_address =
|
|
thread_local_top()->try_catch_handler_address();
|
|
|
|
// The exception has been externally caught if and only if there is
|
|
// an external handler which is on top of the top-most try-catch
|
|
// handler.
|
|
*can_be_caught_externally = external_handler_address != NULL &&
|
|
(handler == NULL || handler->address() > external_handler_address ||
|
|
!catchable_by_javascript);
|
|
|
|
if (*can_be_caught_externally) {
|
|
// Only report the exception if the external handler is verbose.
|
|
return try_catch_handler()->is_verbose_;
|
|
} else {
|
|
// Report the exception if it isn't caught by JavaScript code.
|
|
return handler == NULL;
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::DoThrow(MaybeObject* exception, MessageLocation* location) {
|
|
ASSERT(!has_pending_exception());
|
|
|
|
HandleScope scope;
|
|
Object* exception_object = Smi::FromInt(0);
|
|
bool is_object = exception->ToObject(&exception_object);
|
|
Handle<Object> exception_handle(exception_object);
|
|
|
|
// Determine reporting and whether the exception is caught externally.
|
|
bool catchable_by_javascript = is_catchable_by_javascript(exception);
|
|
// Only real objects can be caught by JS.
|
|
ASSERT(!catchable_by_javascript || is_object);
|
|
bool can_be_caught_externally = false;
|
|
bool should_report_exception =
|
|
ShouldReportException(&can_be_caught_externally, catchable_by_javascript);
|
|
bool report_exception = catchable_by_javascript && should_report_exception;
|
|
|
|
#ifdef ENABLE_DEBUGGER_SUPPORT
|
|
// Notify debugger of exception.
|
|
if (catchable_by_javascript) {
|
|
debugger_->OnException(exception_handle, report_exception);
|
|
}
|
|
#endif
|
|
|
|
// Generate the message.
|
|
Handle<Object> message_obj;
|
|
MessageLocation potential_computed_location;
|
|
bool try_catch_needs_message =
|
|
can_be_caught_externally &&
|
|
try_catch_handler()->capture_message_;
|
|
if (report_exception || try_catch_needs_message) {
|
|
if (location == NULL) {
|
|
// If no location was specified we use a computed one instead
|
|
ComputeLocation(&potential_computed_location);
|
|
location = &potential_computed_location;
|
|
}
|
|
if (!bootstrapper()->IsActive()) {
|
|
// It's not safe to try to make message objects or collect stack
|
|
// traces while the bootstrapper is active since the infrastructure
|
|
// may not have been properly initialized.
|
|
Handle<String> stack_trace;
|
|
if (FLAG_trace_exception) stack_trace = StackTraceString();
|
|
Handle<JSArray> stack_trace_object;
|
|
if (report_exception && capture_stack_trace_for_uncaught_exceptions_) {
|
|
stack_trace_object = CaptureCurrentStackTrace(
|
|
stack_trace_for_uncaught_exceptions_frame_limit_,
|
|
stack_trace_for_uncaught_exceptions_options_);
|
|
}
|
|
ASSERT(is_object); // Can't use the handle unless there's a real object.
|
|
message_obj = MessageHandler::MakeMessageObject("uncaught_exception",
|
|
location, HandleVector<Object>(&exception_handle, 1), stack_trace,
|
|
stack_trace_object);
|
|
}
|
|
}
|
|
|
|
// Save the message for reporting if the the exception remains uncaught.
|
|
thread_local_top()->has_pending_message_ = report_exception;
|
|
if (!message_obj.is_null()) {
|
|
thread_local_top()->pending_message_obj_ = *message_obj;
|
|
if (location != NULL) {
|
|
thread_local_top()->pending_message_script_ = *location->script();
|
|
thread_local_top()->pending_message_start_pos_ = location->start_pos();
|
|
thread_local_top()->pending_message_end_pos_ = location->end_pos();
|
|
}
|
|
}
|
|
|
|
// Do not forget to clean catcher_ if currently thrown exception cannot
|
|
// be caught. If necessary, ReThrow will update the catcher.
|
|
thread_local_top()->catcher_ = can_be_caught_externally ?
|
|
try_catch_handler() : NULL;
|
|
|
|
// NOTE: Notifying the debugger or generating the message
|
|
// may have caused new exceptions. For now, we just ignore
|
|
// that and set the pending exception to the original one.
|
|
if (is_object) {
|
|
set_pending_exception(*exception_handle);
|
|
} else {
|
|
// Failures are not on the heap so they neither need nor work with handles.
|
|
ASSERT(exception_handle->IsFailure());
|
|
set_pending_exception(exception);
|
|
}
|
|
}
|
|
|
|
|
|
bool Isolate::IsExternallyCaught() {
|
|
ASSERT(has_pending_exception());
|
|
|
|
if ((thread_local_top()->catcher_ == NULL) ||
|
|
(try_catch_handler() != thread_local_top()->catcher_)) {
|
|
// When throwing the exception, we found no v8::TryCatch
|
|
// which should care about this exception.
|
|
return false;
|
|
}
|
|
|
|
if (!is_catchable_by_javascript(pending_exception())) {
|
|
return true;
|
|
}
|
|
|
|
// Get the address of the external handler so we can compare the address to
|
|
// determine which one is closer to the top of the stack.
|
|
Address external_handler_address =
|
|
thread_local_top()->try_catch_handler_address();
|
|
ASSERT(external_handler_address != NULL);
|
|
|
|
// The exception has been externally caught if and only if there is
|
|
// an external handler which is on top of the top-most try-finally
|
|
// handler.
|
|
// There should be no try-catch blocks as they would prohibit us from
|
|
// finding external catcher in the first place (see catcher_ check above).
|
|
//
|
|
// Note, that finally clause would rethrow an exception unless it's
|
|
// aborted by jumps in control flow like return, break, etc. and we'll
|
|
// have another chances to set proper v8::TryCatch.
|
|
StackHandler* handler =
|
|
StackHandler::FromAddress(Isolate::handler(thread_local_top()));
|
|
while (handler != NULL && handler->address() < external_handler_address) {
|
|
ASSERT(!handler->is_try_catch());
|
|
if (handler->is_try_finally()) return false;
|
|
|
|
handler = handler->next();
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void Isolate::ReportPendingMessages() {
|
|
ASSERT(has_pending_exception());
|
|
PropagatePendingExceptionToExternalTryCatch();
|
|
|
|
// If the pending exception is OutOfMemoryException set out_of_memory in
|
|
// the global context. Note: We have to mark the global context here
|
|
// since the GenerateThrowOutOfMemory stub cannot make a RuntimeCall to
|
|
// set it.
|
|
HandleScope scope;
|
|
if (thread_local_top_.pending_exception_ == Failure::OutOfMemoryException()) {
|
|
context()->mark_out_of_memory();
|
|
} else if (thread_local_top_.pending_exception_ ==
|
|
heap()->termination_exception()) {
|
|
// Do nothing: if needed, the exception has been already propagated to
|
|
// v8::TryCatch.
|
|
} else {
|
|
if (thread_local_top_.has_pending_message_) {
|
|
thread_local_top_.has_pending_message_ = false;
|
|
if (!thread_local_top_.pending_message_obj_->IsTheHole()) {
|
|
HandleScope scope;
|
|
Handle<Object> message_obj(thread_local_top_.pending_message_obj_);
|
|
if (thread_local_top_.pending_message_script_ != NULL) {
|
|
Handle<Script> script(thread_local_top_.pending_message_script_);
|
|
int start_pos = thread_local_top_.pending_message_start_pos_;
|
|
int end_pos = thread_local_top_.pending_message_end_pos_;
|
|
MessageLocation location(script, start_pos, end_pos);
|
|
MessageHandler::ReportMessage(this, &location, message_obj);
|
|
} else {
|
|
MessageHandler::ReportMessage(this, NULL, message_obj);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
clear_pending_message();
|
|
}
|
|
|
|
|
|
void Isolate::TraceException(bool flag) {
|
|
FLAG_trace_exception = flag; // TODO(isolates): This is an unfortunate use.
|
|
}
|
|
|
|
|
|
bool Isolate::OptionalRescheduleException(bool is_bottom_call) {
|
|
ASSERT(has_pending_exception());
|
|
PropagatePendingExceptionToExternalTryCatch();
|
|
|
|
// Allways reschedule out of memory exceptions.
|
|
if (!is_out_of_memory()) {
|
|
bool is_termination_exception =
|
|
pending_exception() == heap_.termination_exception();
|
|
|
|
// Do not reschedule the exception if this is the bottom call.
|
|
bool clear_exception = is_bottom_call;
|
|
|
|
if (is_termination_exception) {
|
|
if (is_bottom_call) {
|
|
thread_local_top()->external_caught_exception_ = false;
|
|
clear_pending_exception();
|
|
return false;
|
|
}
|
|
} else if (thread_local_top()->external_caught_exception_) {
|
|
// If the exception is externally caught, clear it if there are no
|
|
// JavaScript frames on the way to the C++ frame that has the
|
|
// external handler.
|
|
ASSERT(thread_local_top()->try_catch_handler_address() != NULL);
|
|
Address external_handler_address =
|
|
thread_local_top()->try_catch_handler_address();
|
|
JavaScriptFrameIterator it;
|
|
if (it.done() || (it.frame()->sp() > external_handler_address)) {
|
|
clear_exception = true;
|
|
}
|
|
}
|
|
|
|
// Clear the exception if needed.
|
|
if (clear_exception) {
|
|
thread_local_top()->external_caught_exception_ = false;
|
|
clear_pending_exception();
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Reschedule the exception.
|
|
thread_local_top()->scheduled_exception_ = pending_exception();
|
|
clear_pending_exception();
|
|
return true;
|
|
}
|
|
|
|
|
|
void Isolate::SetCaptureStackTraceForUncaughtExceptions(
|
|
bool capture,
|
|
int frame_limit,
|
|
StackTrace::StackTraceOptions options) {
|
|
capture_stack_trace_for_uncaught_exceptions_ = capture;
|
|
stack_trace_for_uncaught_exceptions_frame_limit_ = frame_limit;
|
|
stack_trace_for_uncaught_exceptions_options_ = options;
|
|
}
|
|
|
|
|
|
bool Isolate::is_out_of_memory() {
|
|
if (has_pending_exception()) {
|
|
MaybeObject* e = pending_exception();
|
|
if (e->IsFailure() && Failure::cast(e)->IsOutOfMemoryException()) {
|
|
return true;
|
|
}
|
|
}
|
|
if (has_scheduled_exception()) {
|
|
MaybeObject* e = scheduled_exception();
|
|
if (e->IsFailure() && Failure::cast(e)->IsOutOfMemoryException()) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
Handle<Context> Isolate::global_context() {
|
|
GlobalObject* global = thread_local_top()->context_->global();
|
|
return Handle<Context>(global->global_context());
|
|
}
|
|
|
|
|
|
Handle<Context> Isolate::GetCallingGlobalContext() {
|
|
JavaScriptFrameIterator it;
|
|
#ifdef ENABLE_DEBUGGER_SUPPORT
|
|
if (debug_->InDebugger()) {
|
|
while (!it.done()) {
|
|
JavaScriptFrame* frame = it.frame();
|
|
Context* context = Context::cast(frame->context());
|
|
if (context->global_context() == *debug_->debug_context()) {
|
|
it.Advance();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif // ENABLE_DEBUGGER_SUPPORT
|
|
if (it.done()) return Handle<Context>::null();
|
|
JavaScriptFrame* frame = it.frame();
|
|
Context* context = Context::cast(frame->context());
|
|
return Handle<Context>(context->global_context());
|
|
}
|
|
|
|
|
|
char* Isolate::ArchiveThread(char* to) {
|
|
if (RuntimeProfiler::IsEnabled() && current_vm_state() == JS) {
|
|
RuntimeProfiler::IsolateExitedJS(this);
|
|
}
|
|
memcpy(to, reinterpret_cast<char*>(thread_local_top()),
|
|
sizeof(ThreadLocalTop));
|
|
InitializeThreadLocal();
|
|
return to + sizeof(ThreadLocalTop);
|
|
}
|
|
|
|
|
|
char* Isolate::RestoreThread(char* from) {
|
|
memcpy(reinterpret_cast<char*>(thread_local_top()), from,
|
|
sizeof(ThreadLocalTop));
|
|
// This might be just paranoia, but it seems to be needed in case a
|
|
// thread_local_top_ is restored on a separate OS thread.
|
|
#ifdef USE_SIMULATOR
|
|
#ifdef V8_TARGET_ARCH_ARM
|
|
thread_local_top()->simulator_ = Simulator::current(this);
|
|
#elif V8_TARGET_ARCH_MIPS
|
|
thread_local_top()->simulator_ = Simulator::current(this);
|
|
#endif
|
|
#endif
|
|
if (RuntimeProfiler::IsEnabled() && current_vm_state() == JS) {
|
|
RuntimeProfiler::IsolateEnteredJS(this);
|
|
}
|
|
return from + sizeof(ThreadLocalTop);
|
|
}
|
|
|
|
} } // namespace v8::internal
|