// Copyright 2012 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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#ifndef V8_ISOLATE_H_
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#define V8_ISOLATE_H_
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#include <cstddef>
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#include <memory>
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#include <queue>
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#include <unordered_map>
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#include <vector>
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#include "include/v8-inspector.h"
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#include "include/v8.h"
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#include "src/allocation.h"
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#include "src/base/atomicops.h"
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#include "src/base/macros.h"
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#include "src/builtins/builtins.h"
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#include "src/contexts.h"
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#include "src/date.h"
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#include "src/debug/debug-interface.h"
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#include "src/execution.h"
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#include "src/futex-emulation.h"
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#include "src/globals.h"
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#include "src/handles.h"
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#include "src/heap/factory.h"
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#include "src/heap/heap.h"
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#include "src/messages.h"
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#include "src/objects/code.h"
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#include "src/objects/debug-objects.h"
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#include "src/runtime/runtime.h"
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#include "src/unicode.h"
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#ifdef V8_INTL_SUPPORT
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#include "unicode/uversion.h" // Define U_ICU_NAMESPACE.
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// 'icu' does not work. Use U_ICU_NAMESPACE.
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namespace U_ICU_NAMESPACE {
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class RegexMatcher;
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} // namespace U_ICU_NAMESPACE
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#endif // V8_INTL_SUPPORT
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namespace v8 {
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namespace base {
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class RandomNumberGenerator;
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}
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namespace debug {
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class ConsoleDelegate;
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}
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namespace internal {
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namespace heap {
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class HeapTester;
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} // namespace heap
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class AccessCompilerData;
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class AddressToIndexHashMap;
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class AstStringConstants;
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class Bootstrapper;
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class BuiltinsConstantsTableBuilder;
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class CancelableTaskManager;
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class CodeEventDispatcher;
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class ExternalCodeEventListener;
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class CodeGenerator;
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class CodeRange;
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class CodeStubDescriptor;
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class CodeTracer;
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class CompilationCache;
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class CompilationStatistics;
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class CompilerDispatcher;
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class ContextSlotCache;
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class Counters;
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class CpuFeatures;
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class Debug;
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class DeoptimizerData;
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class DescriptorLookupCache;
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class EmptyStatement;
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class EternalHandles;
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class ExternalCallbackScope;
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class HandleScopeImplementer;
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class HeapObjectToIndexHashMap;
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class HeapProfiler;
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class InlineRuntimeFunctionsTable;
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class InnerPointerToCodeCache;
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class InstructionStream;
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class Logger;
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class MaterializedObjectStore;
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class Microtask;
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class OptimizingCompileDispatcher;
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class PromiseOnStack;
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class Redirection;
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class RegExpStack;
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class RootVisitor;
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class RuntimeProfiler;
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class SaveContext;
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class SetupIsolateDelegate;
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class Simulator;
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class StartupDeserializer;
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class StandardFrame;
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class StatsTable;
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class StringTracker;
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class StubCache;
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class SweeperThread;
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class ThreadManager;
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class ThreadState;
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class ThreadVisitor; // Defined in v8threads.h
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class TracingCpuProfilerImpl;
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class UnicodeCache;
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struct ManagedPtrDestructor;
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template <StateTag Tag> class VMState;
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namespace interpreter {
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class Interpreter;
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}
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namespace wasm {
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class WasmEngine;
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}
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#define RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate) \
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do { \
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Isolate* __isolate__ = (isolate); \
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DCHECK(!__isolate__->has_pending_exception()); \
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if (__isolate__->has_scheduled_exception()) { \
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return __isolate__->PromoteScheduledException(); \
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} \
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} while (false)
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// Macros for MaybeHandle.
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#define RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, value) \
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do { \
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Isolate* __isolate__ = (isolate); \
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DCHECK(!__isolate__->has_pending_exception()); \
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if (__isolate__->has_scheduled_exception()) { \
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__isolate__->PromoteScheduledException(); \
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return value; \
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} \
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} while (false)
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#define RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, T) \
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RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, MaybeHandle<T>())
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#define ASSIGN_RETURN_ON_SCHEDULED_EXCEPTION_VALUE(isolate, dst, call, value) \
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do { \
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Isolate* __isolate__ = (isolate); \
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if (!(call).ToLocal(&dst)) { \
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DCHECK(__isolate__->has_scheduled_exception()); \
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__isolate__->PromoteScheduledException(); \
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return value; \
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} \
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} while (false)
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#define RETURN_ON_SCHEDULED_EXCEPTION_VALUE(isolate, call, value) \
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do { \
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Isolate* __isolate__ = (isolate); \
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if ((call).IsNothing()) { \
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DCHECK(__isolate__->has_scheduled_exception()); \
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__isolate__->PromoteScheduledException(); \
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return value; \
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} \
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} while (false)
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/**
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* RETURN_RESULT_OR_FAILURE is used in functions with return type Object* (such
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* as "RUNTIME_FUNCTION(...) {...}" or "BUILTIN(...) {...}" ) to return either
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* the contents of a MaybeHandle<X>, or the "exception" sentinel value.
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* Example usage:
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*
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* RUNTIME_FUNCTION(Runtime_Func) {
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* ...
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* RETURN_RESULT_OR_FAILURE(
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* isolate,
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* FunctionWithReturnTypeMaybeHandleX(...));
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* }
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*
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* If inside a function with return type MaybeHandle<X> use RETURN_ON_EXCEPTION
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* instead.
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* If inside a function with return type Handle<X>, or Maybe<X> use
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* RETURN_ON_EXCEPTION_VALUE instead.
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*/
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#define RETURN_RESULT_OR_FAILURE(isolate, call) \
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do { \
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Handle<Object> __result__; \
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Isolate* __isolate__ = (isolate); \
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if (!(call).ToHandle(&__result__)) { \
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DCHECK(__isolate__->has_pending_exception()); \
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return ReadOnlyRoots(__isolate__).exception(); \
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} \
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DCHECK(!__isolate__->has_pending_exception()); \
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return *__result__; \
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} while (false)
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#define ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, dst, call, value) \
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do { \
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if (!(call).ToHandle(&dst)) { \
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DCHECK((isolate)->has_pending_exception()); \
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return value; \
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} \
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} while (false)
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#define ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, dst, call) \
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do { \
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Isolate* __isolate__ = (isolate); \
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(__isolate__, dst, call, \
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ReadOnlyRoots(__isolate__).exception()); \
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} while (false)
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#define ASSIGN_RETURN_ON_EXCEPTION(isolate, dst, call, T) \
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, dst, call, MaybeHandle<T>())
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#define THROW_NEW_ERROR(isolate, call, T) \
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do { \
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Isolate* __isolate__ = (isolate); \
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return __isolate__->Throw<T>(__isolate__->factory()->call); \
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} while (false)
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#define THROW_NEW_ERROR_RETURN_FAILURE(isolate, call) \
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do { \
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Isolate* __isolate__ = (isolate); \
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return __isolate__->Throw(*__isolate__->factory()->call); \
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} while (false)
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#define THROW_NEW_ERROR_RETURN_VALUE(isolate, call, value) \
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do { \
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Isolate* __isolate__ = (isolate); \
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__isolate__->Throw(*__isolate__->factory()->call); \
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return value; \
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} while (false)
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/**
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* RETURN_ON_EXCEPTION_VALUE conditionally returns the given value when the
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* given MaybeHandle is empty. It is typically used in functions with return
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* type Maybe<X> or Handle<X>. Example usage:
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*
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* Handle<X> Func() {
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* ...
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* RETURN_ON_EXCEPTION_VALUE(
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* isolate,
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* FunctionWithReturnTypeMaybeHandleX(...),
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* Handle<X>());
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* // code to handle non exception
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* ...
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* }
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*
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* Maybe<bool> Func() {
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* ..
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* RETURN_ON_EXCEPTION_VALUE(
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* isolate,
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* FunctionWithReturnTypeMaybeHandleX(...),
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* Nothing<bool>);
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* // code to handle non exception
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* return Just(true);
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* }
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*
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* If inside a function with return type MaybeHandle<X>, use RETURN_ON_EXCEPTION
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* instead.
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* If inside a function with return type Object*, use
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* RETURN_FAILURE_ON_EXCEPTION instead.
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*/
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#define RETURN_ON_EXCEPTION_VALUE(isolate, call, value) \
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do { \
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if ((call).is_null()) { \
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DCHECK((isolate)->has_pending_exception()); \
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return value; \
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} \
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} while (false)
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/**
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* RETURN_FAILURE_ON_EXCEPTION conditionally returns the "exception" sentinel if
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* the given MaybeHandle is empty; so it can only be used in functions with
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* return type Object*, such as RUNTIME_FUNCTION(...) {...} or BUILTIN(...)
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* {...}. Example usage:
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*
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* RUNTIME_FUNCTION(Runtime_Func) {
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* ...
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* RETURN_FAILURE_ON_EXCEPTION(
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* isolate,
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* FunctionWithReturnTypeMaybeHandleX(...));
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* // code to handle non exception
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* ...
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* }
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*
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* If inside a function with return type MaybeHandle<X>, use RETURN_ON_EXCEPTION
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* instead.
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* If inside a function with return type Maybe<X> or Handle<X>, use
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* RETURN_ON_EXCEPTION_VALUE instead.
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*/
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#define RETURN_FAILURE_ON_EXCEPTION(isolate, call) \
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do { \
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Isolate* __isolate__ = (isolate); \
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RETURN_ON_EXCEPTION_VALUE(__isolate__, call, \
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ReadOnlyRoots(__isolate__).exception()); \
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} while (false);
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/**
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* RETURN_ON_EXCEPTION conditionally returns an empty MaybeHandle<T> if the
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* given MaybeHandle is empty. Use it to return immediately from a function with
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* return type MaybeHandle when an exception was thrown. Example usage:
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*
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* MaybeHandle<X> Func() {
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* ...
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* RETURN_ON_EXCEPTION(
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* isolate,
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* FunctionWithReturnTypeMaybeHandleY(...),
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* X);
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* // code to handle non exception
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* ...
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* }
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*
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* If inside a function with return type Object*, use
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* RETURN_FAILURE_ON_EXCEPTION instead.
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* If inside a function with return type
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* Maybe<X> or Handle<X>, use RETURN_ON_EXCEPTION_VALUE instead.
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*/
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#define RETURN_ON_EXCEPTION(isolate, call, T) \
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RETURN_ON_EXCEPTION_VALUE(isolate, call, MaybeHandle<T>())
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#define FOR_WITH_HANDLE_SCOPE(isolate, loop_var_type, init, loop_var, \
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limit_check, increment, body) \
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do { \
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loop_var_type init; \
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loop_var_type for_with_handle_limit = loop_var; \
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Isolate* for_with_handle_isolate = isolate; \
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while (limit_check) { \
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for_with_handle_limit += 1024; \
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HandleScope loop_scope(for_with_handle_isolate); \
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for (; limit_check && loop_var < for_with_handle_limit; increment) { \
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body \
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} \
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} \
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} while (false)
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// Platform-independent, reliable thread identifier.
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class ThreadId {
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public:
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// Creates an invalid ThreadId.
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ThreadId() { base::Relaxed_Store(&id_, kInvalidId); }
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ThreadId& operator=(const ThreadId& other) {
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base::Relaxed_Store(&id_, base::Relaxed_Load(&other.id_));
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return *this;
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}
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bool operator==(const ThreadId& other) const { return Equals(other); }
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// Returns ThreadId for current thread.
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static ThreadId Current() { return ThreadId(GetCurrentThreadId()); }
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// Returns invalid ThreadId (guaranteed not to be equal to any thread).
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static ThreadId Invalid() { return ThreadId(kInvalidId); }
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// Compares ThreadIds for equality.
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V8_INLINE bool Equals(const ThreadId& other) const {
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return base::Relaxed_Load(&id_) == base::Relaxed_Load(&other.id_);
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}
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// Checks whether this ThreadId refers to any thread.
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V8_INLINE bool IsValid() const {
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return base::Relaxed_Load(&id_) != kInvalidId;
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}
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// Converts ThreadId to an integer representation
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// (required for public API: V8::V8::GetCurrentThreadId).
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int ToInteger() const { return static_cast<int>(base::Relaxed_Load(&id_)); }
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// Converts ThreadId to an integer representation
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// (required for public API: V8::V8::TerminateExecution).
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static ThreadId FromInteger(int id) { return ThreadId(id); }
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private:
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static const int kInvalidId = -1;
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explicit ThreadId(int id) { base::Relaxed_Store(&id_, id); }
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static int AllocateThreadId();
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V8_EXPORT_PRIVATE static int GetCurrentThreadId();
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base::Atomic32 id_;
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static base::Atomic32 highest_thread_id_;
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friend class Isolate;
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};
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#define FIELD_ACCESSOR(type, name) \
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inline void set_##name(type v) { name##_ = v; } \
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inline type name() const { return name##_; }
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class ThreadLocalTop BASE_EMBEDDED {
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public:
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// Does early low-level initialization that does not depend on the
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// isolate being present.
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ThreadLocalTop() = default;
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// Initialize the thread data.
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void Initialize(Isolate*);
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// Get the top C++ try catch handler or nullptr if none are registered.
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//
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// This method is not guaranteed to return an address that can be
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// used for comparison with addresses into the JS stack. If such an
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// address is needed, use try_catch_handler_address.
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FIELD_ACCESSOR(v8::TryCatch*, try_catch_handler)
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// Get the address of the top C++ try catch handler or nullptr if
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// none are registered.
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//
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// This method always returns an address that can be compared to
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// pointers into the JavaScript stack. When running on actual
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// hardware, try_catch_handler_address and TryCatchHandler return
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// the same pointer. When running on a simulator with a separate JS
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// stack, try_catch_handler_address returns a JS stack address that
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// corresponds to the place on the JS stack where the C++ handler
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// would have been if the stack were not separate.
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Address try_catch_handler_address() {
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return reinterpret_cast<Address>(
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v8::TryCatch::JSStackComparableAddress(try_catch_handler()));
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}
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void Free();
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Isolate* isolate_ = nullptr;
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// The context where the current execution method is created and for variable
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// lookups.
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Context* context_ = nullptr;
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ThreadId thread_id_ = ThreadId::Invalid();
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Object* pending_exception_ = nullptr;
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// TODO(kschimpf): Change this to a stack of caught exceptions (rather than
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// just innermost catching try block).
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Object* wasm_caught_exception_ = nullptr;
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// Communication channel between Isolate::FindHandler and the CEntry.
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Context* pending_handler_context_ = nullptr;
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Address pending_handler_entrypoint_ = kNullAddress;
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Address pending_handler_constant_pool_ = kNullAddress;
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Address pending_handler_fp_ = kNullAddress;
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Address pending_handler_sp_ = kNullAddress;
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// Communication channel between Isolate::Throw and message consumers.
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bool rethrowing_message_ = false;
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Object* pending_message_obj_ = nullptr;
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// Use a separate value for scheduled exceptions to preserve the
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// invariants that hold about pending_exception. We may want to
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// unify them later.
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Object* scheduled_exception_ = nullptr;
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bool external_caught_exception_ = false;
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SaveContext* save_context_ = nullptr;
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// Stack.
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// The frame pointer of the top c entry frame.
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Address c_entry_fp_ = kNullAddress;
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// Try-blocks are chained through the stack.
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Address handler_ = kNullAddress;
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// C function that was called at c entry.
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Address c_function_ = kNullAddress;
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// Throwing an exception may cause a Promise rejection. For this purpose
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// we keep track of a stack of nested promises and the corresponding
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// try-catch handlers.
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PromiseOnStack* promise_on_stack_ = nullptr;
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#ifdef USE_SIMULATOR
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Simulator* simulator_ = nullptr;
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#endif
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// The stack pointer of the bottom JS entry frame.
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Address js_entry_sp_ = kNullAddress;
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// The external callback we're currently in.
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ExternalCallbackScope* external_callback_scope_ = nullptr;
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StateTag current_vm_state_ = EXTERNAL;
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// Call back function to report unsafe JS accesses.
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v8::FailedAccessCheckCallback failed_access_check_callback_ = nullptr;
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// Address of the thread-local "thread in wasm" flag.
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Address thread_in_wasm_flag_address_ = kNullAddress;
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private:
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v8::TryCatch* try_catch_handler_ = nullptr;
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};
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#ifdef DEBUG
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#define ISOLATE_INIT_DEBUG_ARRAY_LIST(V) \
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V(CommentStatistic, paged_space_comments_statistics, \
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CommentStatistic::kMaxComments + 1) \
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V(int, code_kind_statistics, AbstractCode::NUMBER_OF_KINDS)
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#else
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#define ISOLATE_INIT_DEBUG_ARRAY_LIST(V)
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#endif
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#define ISOLATE_INIT_ARRAY_LIST(V) \
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/* SerializerDeserializer state. */ \
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V(int32_t, jsregexp_static_offsets_vector, kJSRegexpStaticOffsetsVectorSize) \
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V(int, bad_char_shift_table, kUC16AlphabetSize) \
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V(int, good_suffix_shift_table, (kBMMaxShift + 1)) \
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V(int, suffix_table, (kBMMaxShift + 1)) \
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ISOLATE_INIT_DEBUG_ARRAY_LIST(V)
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typedef std::vector<HeapObject*> DebugObjectCache;
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#define ISOLATE_INIT_LIST(V) \
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/* Assembler state. */ \
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V(FatalErrorCallback, exception_behavior, nullptr) \
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V(OOMErrorCallback, oom_behavior, nullptr) \
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V(LogEventCallback, event_logger, nullptr) \
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V(AllowCodeGenerationFromStringsCallback, allow_code_gen_callback, nullptr) \
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V(AllowWasmCodeGenerationCallback, allow_wasm_code_gen_callback, nullptr) \
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V(ExtensionCallback, wasm_module_callback, &NoExtension) \
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V(ExtensionCallback, wasm_instance_callback, &NoExtension) \
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V(ApiImplementationCallback, wasm_compile_streaming_callback, nullptr) \
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V(WasmStreamingCallback, wasm_streaming_callback, nullptr) \
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V(WasmThreadsEnabledCallback, wasm_threads_enabled_callback, nullptr) \
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/* State for Relocatable. */ \
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V(Relocatable*, relocatable_top, nullptr) \
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V(DebugObjectCache*, string_stream_debug_object_cache, nullptr) \
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V(Object*, string_stream_current_security_token, nullptr) \
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V(const intptr_t*, api_external_references, nullptr) \
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V(AddressToIndexHashMap*, external_reference_map, nullptr) \
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V(HeapObjectToIndexHashMap*, root_index_map, nullptr) \
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V(int, pending_microtask_count, 0) \
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V(CompilationStatistics*, turbo_statistics, nullptr) \
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V(CodeTracer*, code_tracer, nullptr) \
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V(uint32_t, per_isolate_assert_data, 0xFFFFFFFFu) \
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V(PromiseRejectCallback, promise_reject_callback, nullptr) \
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V(const v8::StartupData*, snapshot_blob, nullptr) \
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V(int, code_and_metadata_size, 0) \
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V(int, bytecode_and_metadata_size, 0) \
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V(int, external_script_source_size, 0) \
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/* true if being profiled. Causes collection of extra compile info. */ \
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V(bool, is_profiling, false) \
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/* true if a trace is being formatted through Error.prepareStackTrace. */ \
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V(bool, formatting_stack_trace, false) \
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/* Perform side effect checks on function call and API callbacks. */ \
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V(DebugInfo::ExecutionMode, debug_execution_mode, DebugInfo::kBreakpoints) \
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/* Current code coverage mode */ \
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V(debug::Coverage::Mode, code_coverage_mode, debug::Coverage::kBestEffort) \
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V(debug::TypeProfile::Mode, type_profile_mode, debug::TypeProfile::kNone) \
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V(int, last_stack_frame_info_id, 0) \
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V(int, last_console_context_id, 0) \
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V(v8_inspector::V8Inspector*, inspector, nullptr) \
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V(bool, next_v8_call_is_safe_for_termination, false) \
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V(bool, only_terminate_in_safe_scope, false)
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#define THREAD_LOCAL_TOP_ACCESSOR(type, name) \
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inline void set_##name(type v) { thread_local_top_.name##_ = v; } \
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inline type name() const { return thread_local_top_.name##_; }
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#define THREAD_LOCAL_TOP_ADDRESS(type, name) \
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type* name##_address() { return &thread_local_top_.name##_; }
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// HiddenFactory exists so Isolate can privately inherit from it without making
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// Factory's members available to Isolate directly.
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class V8_EXPORT_PRIVATE HiddenFactory : private Factory {};
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class Isolate : private HiddenFactory {
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// These forward declarations are required to make the friend declarations in
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// PerIsolateThreadData work on some older versions of gcc.
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class ThreadDataTable;
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class EntryStackItem;
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public:
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~Isolate();
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// A thread has a PerIsolateThreadData instance for each isolate that it has
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// entered. That instance is allocated when the isolate is initially entered
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// and reused on subsequent entries.
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class PerIsolateThreadData {
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public:
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PerIsolateThreadData(Isolate* isolate, ThreadId thread_id)
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: isolate_(isolate),
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thread_id_(thread_id),
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stack_limit_(0),
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thread_state_(nullptr),
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#if USE_SIMULATOR
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simulator_(nullptr),
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#endif
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next_(nullptr),
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prev_(nullptr) {
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}
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~PerIsolateThreadData();
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Isolate* isolate() const { return isolate_; }
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ThreadId thread_id() const { return thread_id_; }
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FIELD_ACCESSOR(uintptr_t, stack_limit)
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FIELD_ACCESSOR(ThreadState*, thread_state)
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#if USE_SIMULATOR
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FIELD_ACCESSOR(Simulator*, simulator)
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#endif
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bool Matches(Isolate* isolate, ThreadId thread_id) const {
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return isolate_ == isolate && thread_id_.Equals(thread_id);
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}
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private:
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Isolate* isolate_;
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ThreadId thread_id_;
|
uintptr_t stack_limit_;
|
ThreadState* thread_state_;
|
|
#if USE_SIMULATOR
|
Simulator* simulator_;
|
#endif
|
|
PerIsolateThreadData* next_;
|
PerIsolateThreadData* prev_;
|
|
friend class Isolate;
|
friend class ThreadDataTable;
|
friend class EntryStackItem;
|
|
DISALLOW_COPY_AND_ASSIGN(PerIsolateThreadData);
|
};
|
|
static void InitializeOncePerProcess();
|
|
// Returns the PerIsolateThreadData for the current thread (or nullptr if one
|
// is not currently set).
|
static PerIsolateThreadData* CurrentPerIsolateThreadData() {
|
return reinterpret_cast<PerIsolateThreadData*>(
|
base::Thread::GetThreadLocal(per_isolate_thread_data_key_));
|
}
|
|
// Returns the isolate inside which the current thread is running.
|
V8_INLINE static Isolate* Current() {
|
DCHECK_EQ(base::Relaxed_Load(&isolate_key_created_), 1);
|
Isolate* isolate = reinterpret_cast<Isolate*>(
|
base::Thread::GetExistingThreadLocal(isolate_key_));
|
DCHECK_NOT_NULL(isolate);
|
return isolate;
|
}
|
|
// Get the isolate that the given HeapObject lives in, returning true on
|
// success. If the object is not writable (i.e. lives in read-only space),
|
// return false.
|
inline static bool FromWritableHeapObject(HeapObject* obj, Isolate** isolate);
|
|
// Usually called by Init(), but can be called early e.g. to allow
|
// testing components that require logging but not the whole
|
// isolate.
|
//
|
// Safe to call more than once.
|
void InitializeLoggingAndCounters();
|
bool InitializeCounters(); // Returns false if already initialized.
|
|
bool Init(StartupDeserializer* des);
|
|
// True if at least one thread Enter'ed this isolate.
|
bool IsInUse() { return entry_stack_ != nullptr; }
|
|
// Destroys the non-default isolates.
|
// Sets default isolate into "has_been_disposed" state rather then destroying,
|
// for legacy API reasons.
|
void TearDown();
|
|
void ReleaseSharedPtrs();
|
|
void ClearSerializerData();
|
|
// Find the PerThread for this particular (isolate, thread) combination
|
// If one does not yet exist, return null.
|
PerIsolateThreadData* FindPerThreadDataForThisThread();
|
|
// Find the PerThread for given (isolate, thread) combination
|
// If one does not yet exist, return null.
|
PerIsolateThreadData* FindPerThreadDataForThread(ThreadId thread_id);
|
|
// Discard the PerThread for this particular (isolate, thread) combination
|
// If one does not yet exist, no-op.
|
void DiscardPerThreadDataForThisThread();
|
|
// Returns the key used to store the pointer to the current isolate.
|
// Used internally for V8 threads that do not execute JavaScript but still
|
// are part of the domain of an isolate (like the context switcher).
|
static base::Thread::LocalStorageKey isolate_key() {
|
return isolate_key_;
|
}
|
|
// Returns the key used to store process-wide thread IDs.
|
static base::Thread::LocalStorageKey thread_id_key() {
|
return thread_id_key_;
|
}
|
|
static base::Thread::LocalStorageKey per_isolate_thread_data_key();
|
|
// Mutex for serializing access to break control structures.
|
base::RecursiveMutex* break_access() { return &break_access_; }
|
|
Address get_address_from_id(IsolateAddressId id);
|
|
// Access to top context (where the current function object was created).
|
Context* context() { return thread_local_top_.context_; }
|
inline void set_context(Context* context);
|
Context** context_address() { return &thread_local_top_.context_; }
|
|
THREAD_LOCAL_TOP_ACCESSOR(SaveContext*, save_context)
|
|
// Access to current thread id.
|
THREAD_LOCAL_TOP_ACCESSOR(ThreadId, thread_id)
|
|
// Interface to pending exception.
|
inline Object* pending_exception();
|
inline void set_pending_exception(Object* exception_obj);
|
inline void clear_pending_exception();
|
|
// Interface to wasm caught exception.
|
inline Object* get_wasm_caught_exception();
|
inline void set_wasm_caught_exception(Object* exception);
|
inline void clear_wasm_caught_exception();
|
|
bool AreWasmThreadsEnabled(Handle<Context> context);
|
|
THREAD_LOCAL_TOP_ADDRESS(Object*, pending_exception)
|
|
inline bool has_pending_exception();
|
|
THREAD_LOCAL_TOP_ADDRESS(Context*, pending_handler_context)
|
THREAD_LOCAL_TOP_ADDRESS(Address, pending_handler_entrypoint)
|
THREAD_LOCAL_TOP_ADDRESS(Address, pending_handler_constant_pool)
|
THREAD_LOCAL_TOP_ADDRESS(Address, pending_handler_fp)
|
THREAD_LOCAL_TOP_ADDRESS(Address, pending_handler_sp)
|
|
THREAD_LOCAL_TOP_ACCESSOR(bool, external_caught_exception)
|
|
v8::TryCatch* try_catch_handler() {
|
return thread_local_top_.try_catch_handler();
|
}
|
bool* external_caught_exception_address() {
|
return &thread_local_top_.external_caught_exception_;
|
}
|
|
THREAD_LOCAL_TOP_ADDRESS(Object*, scheduled_exception)
|
|
inline void clear_pending_message();
|
Address pending_message_obj_address() {
|
return reinterpret_cast<Address>(&thread_local_top_.pending_message_obj_);
|
}
|
|
inline Object* scheduled_exception();
|
inline bool has_scheduled_exception();
|
inline void clear_scheduled_exception();
|
|
bool IsJavaScriptHandlerOnTop(Object* exception);
|
bool IsExternalHandlerOnTop(Object* exception);
|
|
inline bool is_catchable_by_javascript(Object* exception);
|
bool is_catchable_by_wasm(Object* exception);
|
|
// JS execution stack (see frames.h).
|
static Address c_entry_fp(ThreadLocalTop* thread) {
|
return thread->c_entry_fp_;
|
}
|
static Address handler(ThreadLocalTop* thread) { return thread->handler_; }
|
Address c_function() { return thread_local_top_.c_function_; }
|
|
inline Address* c_entry_fp_address() {
|
return &thread_local_top_.c_entry_fp_;
|
}
|
inline Address* handler_address() { return &thread_local_top_.handler_; }
|
inline Address* c_function_address() {
|
return &thread_local_top_.c_function_;
|
}
|
|
// Bottom JS entry.
|
Address js_entry_sp() {
|
return thread_local_top_.js_entry_sp_;
|
}
|
inline Address* js_entry_sp_address() {
|
return &thread_local_top_.js_entry_sp_;
|
}
|
|
// Returns the global object of the current context. It could be
|
// a builtin object, or a JS global object.
|
inline Handle<JSGlobalObject> global_object();
|
|
// Returns the global proxy object of the current context.
|
inline Handle<JSObject> global_proxy();
|
|
static int ArchiveSpacePerThread() { return sizeof(ThreadLocalTop); }
|
void FreeThreadResources() { thread_local_top_.Free(); }
|
|
// This method is called by the api after operations that may throw
|
// exceptions. If an exception was thrown and not handled by an external
|
// handler the exception is scheduled to be rethrown when we return to running
|
// JavaScript code. If an exception is scheduled true is returned.
|
V8_EXPORT_PRIVATE bool OptionalRescheduleException(bool is_bottom_call);
|
|
// Push and pop a promise and the current try-catch handler.
|
void PushPromise(Handle<JSObject> promise);
|
void PopPromise();
|
|
// Return the relevant Promise that a throw/rejection pertains to, based
|
// on the contents of the Promise stack
|
Handle<Object> GetPromiseOnStackOnThrow();
|
|
// Heuristically guess whether a Promise is handled by user catch handler
|
bool PromiseHasUserDefinedRejectHandler(Handle<Object> promise);
|
|
class ExceptionScope {
|
public:
|
// Scope currently can only be used for regular exceptions,
|
// not termination exception.
|
inline explicit ExceptionScope(Isolate* isolate);
|
inline ~ExceptionScope();
|
|
private:
|
Isolate* isolate_;
|
Handle<Object> pending_exception_;
|
};
|
|
void SetCaptureStackTraceForUncaughtExceptions(
|
bool capture,
|
int frame_limit,
|
StackTrace::StackTraceOptions options);
|
|
void SetAbortOnUncaughtExceptionCallback(
|
v8::Isolate::AbortOnUncaughtExceptionCallback callback);
|
|
enum PrintStackMode { kPrintStackConcise, kPrintStackVerbose };
|
void PrintCurrentStackTrace(FILE* out);
|
void PrintStack(StringStream* accumulator,
|
PrintStackMode mode = kPrintStackVerbose);
|
V8_EXPORT_PRIVATE void PrintStack(FILE* out,
|
PrintStackMode mode = kPrintStackVerbose);
|
Handle<String> StackTraceString();
|
// Stores a stack trace in a stack-allocated temporary buffer which will
|
// end up in the minidump for debugging purposes.
|
V8_NOINLINE void PushStackTraceAndDie(void* ptr1 = nullptr,
|
void* ptr2 = nullptr,
|
void* ptr3 = nullptr,
|
void* ptr4 = nullptr);
|
Handle<FixedArray> CaptureCurrentStackTrace(
|
int frame_limit, StackTrace::StackTraceOptions options);
|
Handle<Object> CaptureSimpleStackTrace(Handle<JSReceiver> error_object,
|
FrameSkipMode mode,
|
Handle<Object> caller);
|
MaybeHandle<JSReceiver> CaptureAndSetDetailedStackTrace(
|
Handle<JSReceiver> error_object);
|
MaybeHandle<JSReceiver> CaptureAndSetSimpleStackTrace(
|
Handle<JSReceiver> error_object, FrameSkipMode mode,
|
Handle<Object> caller);
|
Handle<FixedArray> GetDetailedStackTrace(Handle<JSObject> error_object);
|
|
Address GetAbstractPC(int* line, int* column);
|
|
// Returns if the given context may access the given global object. If
|
// the result is false, the pending exception is guaranteed to be
|
// set.
|
bool MayAccess(Handle<Context> accessing_context, Handle<JSObject> receiver);
|
|
void SetFailedAccessCheckCallback(v8::FailedAccessCheckCallback callback);
|
void ReportFailedAccessCheck(Handle<JSObject> receiver);
|
|
// Exception throwing support. The caller should use the result
|
// of Throw() as its return value.
|
Object* Throw(Object* exception, MessageLocation* location = nullptr);
|
Object* ThrowIllegalOperation();
|
|
template <typename T>
|
V8_WARN_UNUSED_RESULT MaybeHandle<T> Throw(
|
Handle<Object> exception, MessageLocation* location = nullptr) {
|
Throw(*exception, location);
|
return MaybeHandle<T>();
|
}
|
|
void set_console_delegate(debug::ConsoleDelegate* delegate) {
|
console_delegate_ = delegate;
|
}
|
debug::ConsoleDelegate* console_delegate() { return console_delegate_; }
|
|
void set_async_event_delegate(debug::AsyncEventDelegate* delegate) {
|
async_event_delegate_ = delegate;
|
PromiseHookStateUpdated();
|
}
|
void OnAsyncFunctionStateChanged(Handle<JSPromise> promise,
|
debug::DebugAsyncActionType);
|
|
// Re-throw an exception. This involves no error reporting since error
|
// reporting was handled when the exception was thrown originally.
|
Object* ReThrow(Object* exception);
|
|
// Find the correct handler for the current pending exception. This also
|
// clears and returns the current pending exception.
|
Object* UnwindAndFindHandler();
|
|
// Tries to predict whether an exception will be caught. Note that this can
|
// only produce an estimate, because it is undecidable whether a finally
|
// clause will consume or re-throw an exception.
|
enum CatchType {
|
NOT_CAUGHT,
|
CAUGHT_BY_JAVASCRIPT,
|
CAUGHT_BY_EXTERNAL,
|
CAUGHT_BY_DESUGARING,
|
CAUGHT_BY_PROMISE,
|
CAUGHT_BY_ASYNC_AWAIT
|
};
|
CatchType PredictExceptionCatcher();
|
|
V8_EXPORT_PRIVATE void ScheduleThrow(Object* exception);
|
// Re-set pending message, script and positions reported to the TryCatch
|
// back to the TLS for re-use when rethrowing.
|
void RestorePendingMessageFromTryCatch(v8::TryCatch* handler);
|
// Un-schedule an exception that was caught by a TryCatch handler.
|
void CancelScheduledExceptionFromTryCatch(v8::TryCatch* handler);
|
void ReportPendingMessages();
|
void ReportPendingMessagesFromJavaScript();
|
|
// Implements code shared between the two above methods
|
void ReportPendingMessagesImpl(bool report_externally);
|
|
// Return pending location if any or unfilled structure.
|
MessageLocation GetMessageLocation();
|
|
// Promote a scheduled exception to pending. Asserts has_scheduled_exception.
|
Object* PromoteScheduledException();
|
|
// Attempts to compute the current source location, storing the
|
// result in the target out parameter. The source location is attached to a
|
// Message object as the location which should be shown to the user. It's
|
// typically the top-most meaningful location on the stack.
|
bool ComputeLocation(MessageLocation* target);
|
bool ComputeLocationFromException(MessageLocation* target,
|
Handle<Object> exception);
|
bool ComputeLocationFromStackTrace(MessageLocation* target,
|
Handle<Object> exception);
|
|
Handle<JSMessageObject> CreateMessage(Handle<Object> exception,
|
MessageLocation* location);
|
|
// Out of resource exception helpers.
|
Object* StackOverflow();
|
Object* TerminateExecution();
|
void CancelTerminateExecution();
|
|
void RequestInterrupt(InterruptCallback callback, void* data);
|
void InvokeApiInterruptCallbacks();
|
|
// Administration
|
void Iterate(RootVisitor* v);
|
void Iterate(RootVisitor* v, ThreadLocalTop* t);
|
char* Iterate(RootVisitor* v, char* t);
|
void IterateThread(ThreadVisitor* v, char* t);
|
|
// Returns the current native context.
|
inline Handle<NativeContext> native_context();
|
inline NativeContext* raw_native_context();
|
|
Handle<Context> GetIncumbentContext();
|
|
void RegisterTryCatchHandler(v8::TryCatch* that);
|
void UnregisterTryCatchHandler(v8::TryCatch* that);
|
|
char* ArchiveThread(char* to);
|
char* RestoreThread(char* from);
|
|
static const int kUC16AlphabetSize = 256; // See StringSearchBase.
|
static const int kBMMaxShift = 250; // See StringSearchBase.
|
|
// Accessors.
|
#define GLOBAL_ACCESSOR(type, name, initialvalue) \
|
inline type name() const { \
|
DCHECK(OFFSET_OF(Isolate, name##_) == name##_debug_offset_); \
|
return name##_; \
|
} \
|
inline void set_##name(type value) { \
|
DCHECK(OFFSET_OF(Isolate, name##_) == name##_debug_offset_); \
|
name##_ = value; \
|
}
|
ISOLATE_INIT_LIST(GLOBAL_ACCESSOR)
|
#undef GLOBAL_ACCESSOR
|
|
#define GLOBAL_ARRAY_ACCESSOR(type, name, length) \
|
inline type* name() { \
|
DCHECK(OFFSET_OF(Isolate, name##_) == name##_debug_offset_); \
|
return &(name##_)[0]; \
|
}
|
ISOLATE_INIT_ARRAY_LIST(GLOBAL_ARRAY_ACCESSOR)
|
#undef GLOBAL_ARRAY_ACCESSOR
|
|
#define NATIVE_CONTEXT_FIELD_ACCESSOR(index, type, name) \
|
inline Handle<type> name(); \
|
inline bool is_##name(type* value);
|
NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSOR)
|
#undef NATIVE_CONTEXT_FIELD_ACCESSOR
|
|
Bootstrapper* bootstrapper() { return bootstrapper_; }
|
// Use for updating counters on a foreground thread.
|
Counters* counters() { return async_counters().get(); }
|
// Use for updating counters on a background thread.
|
const std::shared_ptr<Counters>& async_counters() {
|
// Make sure InitializeCounters() has been called.
|
DCHECK_NOT_NULL(async_counters_.get());
|
return async_counters_;
|
}
|
RuntimeProfiler* runtime_profiler() { return runtime_profiler_; }
|
CompilationCache* compilation_cache() { return compilation_cache_; }
|
Logger* logger() {
|
// Call InitializeLoggingAndCounters() if logging is needed before
|
// the isolate is fully initialized.
|
DCHECK_NOT_NULL(logger_);
|
return logger_;
|
}
|
StackGuard* stack_guard() { return &stack_guard_; }
|
Heap* heap() { return &heap_; }
|
StubCache* load_stub_cache() { return load_stub_cache_; }
|
StubCache* store_stub_cache() { return store_stub_cache_; }
|
DeoptimizerData* deoptimizer_data() { return deoptimizer_data_; }
|
bool deoptimizer_lazy_throw() const { return deoptimizer_lazy_throw_; }
|
void set_deoptimizer_lazy_throw(bool value) {
|
deoptimizer_lazy_throw_ = value;
|
}
|
ThreadLocalTop* thread_local_top() { return &thread_local_top_; }
|
MaterializedObjectStore* materialized_object_store() {
|
return materialized_object_store_;
|
}
|
|
ContextSlotCache* context_slot_cache() {
|
return context_slot_cache_;
|
}
|
|
DescriptorLookupCache* descriptor_lookup_cache() {
|
return descriptor_lookup_cache_;
|
}
|
|
HandleScopeData* handle_scope_data() { return &handle_scope_data_; }
|
|
HandleScopeImplementer* handle_scope_implementer() {
|
DCHECK(handle_scope_implementer_);
|
return handle_scope_implementer_;
|
}
|
|
UnicodeCache* unicode_cache() {
|
return unicode_cache_;
|
}
|
|
InnerPointerToCodeCache* inner_pointer_to_code_cache() {
|
return inner_pointer_to_code_cache_;
|
}
|
|
GlobalHandles* global_handles() { return global_handles_; }
|
|
EternalHandles* eternal_handles() { return eternal_handles_; }
|
|
ThreadManager* thread_manager() { return thread_manager_; }
|
|
unibrow::Mapping<unibrow::Ecma262UnCanonicalize>* jsregexp_uncanonicalize() {
|
return &jsregexp_uncanonicalize_;
|
}
|
|
unibrow::Mapping<unibrow::CanonicalizationRange>* jsregexp_canonrange() {
|
return &jsregexp_canonrange_;
|
}
|
|
RuntimeState* runtime_state() { return &runtime_state_; }
|
|
Builtins* builtins() { return &builtins_; }
|
|
unibrow::Mapping<unibrow::Ecma262Canonicalize>*
|
regexp_macro_assembler_canonicalize() {
|
return ®exp_macro_assembler_canonicalize_;
|
}
|
|
RegExpStack* regexp_stack() { return regexp_stack_; }
|
|
size_t total_regexp_code_generated() { return total_regexp_code_generated_; }
|
void IncreaseTotalRegexpCodeGenerated(int size) {
|
total_regexp_code_generated_ += size;
|
}
|
|
std::vector<int>* regexp_indices() { return ®exp_indices_; }
|
|
unibrow::Mapping<unibrow::Ecma262Canonicalize>*
|
interp_canonicalize_mapping() {
|
return ®exp_macro_assembler_canonicalize_;
|
}
|
|
Debug* debug() { return debug_; }
|
|
bool* is_profiling_address() { return &is_profiling_; }
|
CodeEventDispatcher* code_event_dispatcher() const {
|
return code_event_dispatcher_.get();
|
}
|
HeapProfiler* heap_profiler() const { return heap_profiler_; }
|
|
#ifdef DEBUG
|
static size_t non_disposed_isolates() { return non_disposed_isolates_; }
|
#endif
|
|
v8::internal::Factory* factory() {
|
// Upcast to the privately inherited base-class using c-style casts to avoid
|
// undefined behavior (as static_cast cannot cast across private bases).
|
return (v8::internal::Factory*)this; // NOLINT(readability/casting)
|
}
|
|
static const int kJSRegexpStaticOffsetsVectorSize = 128;
|
|
THREAD_LOCAL_TOP_ACCESSOR(ExternalCallbackScope*, external_callback_scope)
|
|
THREAD_LOCAL_TOP_ACCESSOR(StateTag, current_vm_state)
|
|
void SetData(uint32_t slot, void* data) {
|
DCHECK_LT(slot, Internals::kNumIsolateDataSlots);
|
embedder_data_[slot] = data;
|
}
|
void* GetData(uint32_t slot) {
|
DCHECK_LT(slot, Internals::kNumIsolateDataSlots);
|
return embedder_data_[slot];
|
}
|
|
bool serializer_enabled() const { return serializer_enabled_; }
|
|
void enable_serializer() { serializer_enabled_ = true; }
|
|
bool snapshot_available() const {
|
return snapshot_blob_ != nullptr && snapshot_blob_->raw_size != 0;
|
}
|
|
bool IsDead() { return has_fatal_error_; }
|
void SignalFatalError() { has_fatal_error_ = true; }
|
|
bool use_optimizer();
|
|
bool initialized_from_snapshot() { return initialized_from_snapshot_; }
|
|
bool NeedsSourcePositionsForProfiling() const;
|
|
bool NeedsDetailedOptimizedCodeLineInfo() const;
|
|
bool is_best_effort_code_coverage() const {
|
return code_coverage_mode() == debug::Coverage::kBestEffort;
|
}
|
|
bool is_precise_count_code_coverage() const {
|
return code_coverage_mode() == debug::Coverage::kPreciseCount;
|
}
|
|
bool is_precise_binary_code_coverage() const {
|
return code_coverage_mode() == debug::Coverage::kPreciseBinary;
|
}
|
|
bool is_block_count_code_coverage() const {
|
return code_coverage_mode() == debug::Coverage::kBlockCount;
|
}
|
|
bool is_block_binary_code_coverage() const {
|
return code_coverage_mode() == debug::Coverage::kBlockBinary;
|
}
|
|
bool is_block_code_coverage() const {
|
return is_block_count_code_coverage() || is_block_binary_code_coverage();
|
}
|
|
bool is_collecting_type_profile() const {
|
return type_profile_mode() == debug::TypeProfile::kCollect;
|
}
|
|
// Collect feedback vectors with data for code coverage or type profile.
|
// Reset the list, when both code coverage and type profile are not
|
// needed anymore. This keeps many feedback vectors alive, but code
|
// coverage or type profile are used for debugging only and increase in
|
// memory usage is expected.
|
void SetFeedbackVectorsForProfilingTools(Object* value);
|
|
void MaybeInitializeVectorListFromHeap();
|
|
double time_millis_since_init() {
|
return heap_.MonotonicallyIncreasingTimeInMs() - time_millis_at_init_;
|
}
|
|
DateCache* date_cache() {
|
return date_cache_;
|
}
|
|
void set_date_cache(DateCache* date_cache) {
|
if (date_cache != date_cache_) {
|
delete date_cache_;
|
}
|
date_cache_ = date_cache;
|
}
|
|
#ifdef V8_INTL_SUPPORT
|
icu::RegexMatcher* language_singleton_regexp_matcher() {
|
return language_singleton_regexp_matcher_;
|
}
|
|
icu::RegexMatcher* language_tag_regexp_matcher() {
|
return language_tag_regexp_matcher_;
|
}
|
|
icu::RegexMatcher* language_variant_regexp_matcher() {
|
return language_variant_regexp_matcher_;
|
}
|
|
const std::string& default_locale() { return default_locale_; }
|
|
void set_default_locale(const std::string& locale) {
|
DCHECK_EQ(default_locale_.length(), 0);
|
default_locale_ = locale;
|
}
|
|
void set_language_tag_regexp_matchers(
|
icu::RegexMatcher* language_singleton_regexp_matcher,
|
icu::RegexMatcher* language_tag_regexp_matcher,
|
icu::RegexMatcher* language_variant_regexp_matcher) {
|
DCHECK_NULL(language_singleton_regexp_matcher_);
|
DCHECK_NULL(language_tag_regexp_matcher_);
|
DCHECK_NULL(language_variant_regexp_matcher_);
|
language_singleton_regexp_matcher_ = language_singleton_regexp_matcher;
|
language_tag_regexp_matcher_ = language_tag_regexp_matcher;
|
language_variant_regexp_matcher_ = language_variant_regexp_matcher;
|
}
|
#endif // V8_INTL_SUPPORT
|
|
static const int kProtectorValid = 1;
|
static const int kProtectorInvalid = 0;
|
|
inline bool IsArrayConstructorIntact();
|
|
// The version with an explicit context parameter can be used when
|
// Isolate::context is not set up, e.g. when calling directly into C++ from
|
// CSA.
|
bool IsNoElementsProtectorIntact(Context* context);
|
bool IsNoElementsProtectorIntact();
|
|
inline bool IsArraySpeciesLookupChainIntact();
|
inline bool IsTypedArraySpeciesLookupChainIntact();
|
inline bool IsPromiseSpeciesLookupChainIntact();
|
bool IsIsConcatSpreadableLookupChainIntact();
|
bool IsIsConcatSpreadableLookupChainIntact(JSReceiver* receiver);
|
inline bool IsStringLengthOverflowIntact();
|
inline bool IsArrayIteratorLookupChainIntact();
|
|
// Make sure we do check for neutered array buffers.
|
inline bool IsArrayBufferNeuteringIntact();
|
|
// Disable promise optimizations if promise (debug) hooks have ever been
|
// active.
|
bool IsPromiseHookProtectorIntact();
|
|
// Make sure a lookup of "resolve" on the %Promise% intrinsic object
|
// yeidls the initial Promise.resolve method.
|
bool IsPromiseResolveLookupChainIntact();
|
|
// Make sure a lookup of "then" on any JSPromise whose [[Prototype]] is the
|
// initial %PromisePrototype% yields the initial method. In addition this
|
// protector also guards the negative lookup of "then" on the intrinsic
|
// %ObjectPrototype%, meaning that such lookups are guaranteed to yield
|
// undefined without triggering any side-effects.
|
bool IsPromiseThenLookupChainIntact();
|
bool IsPromiseThenLookupChainIntact(Handle<JSReceiver> receiver);
|
|
// On intent to set an element in object, make sure that appropriate
|
// notifications occur if the set is on the elements of the array or
|
// object prototype. Also ensure that changes to prototype chain between
|
// Array and Object fire notifications.
|
void UpdateNoElementsProtectorOnSetElement(Handle<JSObject> object);
|
void UpdateNoElementsProtectorOnSetLength(Handle<JSObject> object) {
|
UpdateNoElementsProtectorOnSetElement(object);
|
}
|
void UpdateNoElementsProtectorOnSetPrototype(Handle<JSObject> object) {
|
UpdateNoElementsProtectorOnSetElement(object);
|
}
|
void UpdateNoElementsProtectorOnNormalizeElements(Handle<JSObject> object) {
|
UpdateNoElementsProtectorOnSetElement(object);
|
}
|
void InvalidateArrayConstructorProtector();
|
void InvalidateArraySpeciesProtector();
|
void InvalidateTypedArraySpeciesProtector();
|
void InvalidatePromiseSpeciesProtector();
|
void InvalidateIsConcatSpreadableProtector();
|
void InvalidateStringLengthOverflowProtector();
|
void InvalidateArrayIteratorProtector();
|
void InvalidateArrayBufferNeuteringProtector();
|
V8_EXPORT_PRIVATE void InvalidatePromiseHookProtector();
|
void InvalidatePromiseResolveProtector();
|
void InvalidatePromiseThenProtector();
|
|
// Returns true if array is the initial array prototype in any native context.
|
bool IsAnyInitialArrayPrototype(Handle<JSArray> array);
|
|
void IterateDeferredHandles(RootVisitor* visitor);
|
void LinkDeferredHandles(DeferredHandles* deferred_handles);
|
void UnlinkDeferredHandles(DeferredHandles* deferred_handles);
|
|
#ifdef DEBUG
|
bool IsDeferredHandle(Object** location);
|
#endif // DEBUG
|
|
bool concurrent_recompilation_enabled() {
|
// Thread is only available with flag enabled.
|
DCHECK(optimizing_compile_dispatcher_ == nullptr ||
|
FLAG_concurrent_recompilation);
|
return optimizing_compile_dispatcher_ != nullptr;
|
}
|
|
OptimizingCompileDispatcher* optimizing_compile_dispatcher() {
|
return optimizing_compile_dispatcher_;
|
}
|
// Flushes all pending concurrent optimzation jobs from the optimizing
|
// compile dispatcher's queue.
|
void AbortConcurrentOptimization(BlockingBehavior blocking_behavior);
|
|
int id() const { return static_cast<int>(id_); }
|
|
CompilationStatistics* GetTurboStatistics();
|
CodeTracer* GetCodeTracer();
|
|
void DumpAndResetStats();
|
|
FunctionEntryHook function_entry_hook() { return function_entry_hook_; }
|
void set_function_entry_hook(FunctionEntryHook function_entry_hook) {
|
function_entry_hook_ = function_entry_hook;
|
}
|
|
void* stress_deopt_count_address() { return &stress_deopt_count_; }
|
|
void set_force_slow_path(bool v) { force_slow_path_ = v; }
|
bool force_slow_path() const { return force_slow_path_; }
|
bool* force_slow_path_address() { return &force_slow_path_; }
|
|
V8_EXPORT_PRIVATE base::RandomNumberGenerator* random_number_generator();
|
|
V8_EXPORT_PRIVATE base::RandomNumberGenerator* fuzzer_rng();
|
|
// Generates a random number that is non-zero when masked
|
// with the provided mask.
|
int GenerateIdentityHash(uint32_t mask);
|
|
// Given an address occupied by a live code object, return that object.
|
Code* FindCodeObject(Address a);
|
|
int NextOptimizationId() {
|
int id = next_optimization_id_++;
|
if (!Smi::IsValid(next_optimization_id_)) {
|
next_optimization_id_ = 0;
|
}
|
return id;
|
}
|
|
void AddNearHeapLimitCallback(v8::NearHeapLimitCallback, void* data);
|
void RemoveNearHeapLimitCallback(v8::NearHeapLimitCallback callback,
|
size_t heap_limit);
|
void AddCallCompletedCallback(CallCompletedCallback callback);
|
void RemoveCallCompletedCallback(CallCompletedCallback callback);
|
void FireCallCompletedCallback();
|
|
void AddBeforeCallEnteredCallback(BeforeCallEnteredCallback callback);
|
void RemoveBeforeCallEnteredCallback(BeforeCallEnteredCallback callback);
|
inline void FireBeforeCallEnteredCallback();
|
|
void AddMicrotasksCompletedCallback(MicrotasksCompletedCallback callback);
|
void RemoveMicrotasksCompletedCallback(MicrotasksCompletedCallback callback);
|
inline void FireMicrotasksCompletedCallback();
|
|
void SetPromiseRejectCallback(PromiseRejectCallback callback);
|
void ReportPromiseReject(Handle<JSPromise> promise, Handle<Object> value,
|
v8::PromiseRejectEvent event);
|
|
void EnqueueMicrotask(Handle<Microtask> microtask);
|
void RunMicrotasks();
|
bool IsRunningMicrotasks() const { return is_running_microtasks_; }
|
|
Handle<Symbol> SymbolFor(Heap::RootListIndex dictionary_index,
|
Handle<String> name, bool private_symbol);
|
|
void SetUseCounterCallback(v8::Isolate::UseCounterCallback callback);
|
void CountUsage(v8::Isolate::UseCounterFeature feature);
|
|
std::string GetTurboCfgFileName();
|
|
#if V8_SFI_HAS_UNIQUE_ID
|
int GetNextUniqueSharedFunctionInfoId() { return next_unique_sfi_id_++; }
|
#endif
|
|
Address promise_hook_address() {
|
return reinterpret_cast<Address>(&promise_hook_);
|
}
|
|
Address async_event_delegate_address() {
|
return reinterpret_cast<Address>(&async_event_delegate_);
|
}
|
|
Address promise_hook_or_async_event_delegate_address() {
|
return reinterpret_cast<Address>(&promise_hook_or_async_event_delegate_);
|
}
|
|
Address pending_microtask_count_address() {
|
return reinterpret_cast<Address>(&pending_microtask_count_);
|
}
|
|
Address handle_scope_implementer_address() {
|
return reinterpret_cast<Address>(&handle_scope_implementer_);
|
}
|
|
void SetAtomicsWaitCallback(v8::Isolate::AtomicsWaitCallback callback,
|
void* data);
|
void RunAtomicsWaitCallback(v8::Isolate::AtomicsWaitEvent event,
|
Handle<JSArrayBuffer> array_buffer,
|
size_t offset_in_bytes, int32_t value,
|
double timeout_in_ms,
|
AtomicsWaitWakeHandle* stop_handle);
|
|
void SetPromiseHook(PromiseHook hook);
|
void RunPromiseHook(PromiseHookType type, Handle<JSPromise> promise,
|
Handle<Object> parent);
|
|
void AddDetachedContext(Handle<Context> context);
|
void CheckDetachedContextsAfterGC();
|
|
std::vector<Object*>* partial_snapshot_cache() {
|
return &partial_snapshot_cache_;
|
}
|
|
// Off-heap builtins cannot embed constants within the code object itself,
|
// and thus need to load them from the root list.
|
bool ShouldLoadConstantsFromRootList() const {
|
if (FLAG_embedded_builtins) {
|
return (serializer_enabled() &&
|
builtins_constants_table_builder() != nullptr);
|
} else {
|
return false;
|
}
|
}
|
|
// Called only prior to serialization.
|
// This function copies off-heap-safe builtins off the heap, creates off-heap
|
// trampolines, and sets up this isolate's embedded blob.
|
void PrepareEmbeddedBlobForSerialization();
|
|
BuiltinsConstantsTableBuilder* builtins_constants_table_builder() const {
|
return builtins_constants_table_builder_;
|
}
|
|
static const uint8_t* CurrentEmbeddedBlob();
|
static uint32_t CurrentEmbeddedBlobSize();
|
|
// These always return the same result as static methods above, but don't
|
// access the global atomic variable (and thus *might be* slightly faster).
|
const uint8_t* embedded_blob() const;
|
uint32_t embedded_blob_size() const;
|
|
void set_array_buffer_allocator(v8::ArrayBuffer::Allocator* allocator) {
|
array_buffer_allocator_ = allocator;
|
}
|
v8::ArrayBuffer::Allocator* array_buffer_allocator() const {
|
return array_buffer_allocator_;
|
}
|
|
FutexWaitListNode* futex_wait_list_node() { return &futex_wait_list_node_; }
|
|
CancelableTaskManager* cancelable_task_manager() {
|
return cancelable_task_manager_;
|
}
|
|
const AstStringConstants* ast_string_constants() const {
|
return ast_string_constants_;
|
}
|
|
interpreter::Interpreter* interpreter() const { return interpreter_; }
|
|
AccountingAllocator* allocator() { return allocator_; }
|
|
CompilerDispatcher* compiler_dispatcher() const {
|
return compiler_dispatcher_;
|
}
|
|
bool IsInAnyContext(Object* object, uint32_t index);
|
|
void SetHostImportModuleDynamicallyCallback(
|
HostImportModuleDynamicallyCallback callback);
|
MaybeHandle<JSPromise> RunHostImportModuleDynamicallyCallback(
|
Handle<Script> referrer, Handle<Object> specifier);
|
|
void SetHostInitializeImportMetaObjectCallback(
|
HostInitializeImportMetaObjectCallback callback);
|
Handle<JSObject> RunHostInitializeImportMetaObjectCallback(
|
Handle<Module> module);
|
|
void SetRAILMode(RAILMode rail_mode);
|
|
RAILMode rail_mode() { return rail_mode_.Value(); }
|
|
double LoadStartTimeMs();
|
|
void IsolateInForegroundNotification();
|
|
void IsolateInBackgroundNotification();
|
|
bool IsIsolateInBackground() { return is_isolate_in_background_; }
|
|
void EnableMemorySavingsMode() { memory_savings_mode_active_ = true; }
|
|
void DisableMemorySavingsMode() { memory_savings_mode_active_ = false; }
|
|
bool IsMemorySavingsModeActive() { return memory_savings_mode_active_; }
|
|
PRINTF_FORMAT(2, 3) void PrintWithTimestamp(const char* format, ...);
|
|
void set_allow_atomics_wait(bool set) { allow_atomics_wait_ = set; }
|
bool allow_atomics_wait() { return allow_atomics_wait_; }
|
|
// Register a finalizer to be called at isolate teardown.
|
void RegisterManagedPtrDestructor(ManagedPtrDestructor* finalizer);
|
|
// Removes a previously-registered shared object finalizer.
|
void UnregisterManagedPtrDestructor(ManagedPtrDestructor* finalizer);
|
|
size_t elements_deletion_counter() { return elements_deletion_counter_; }
|
void set_elements_deletion_counter(size_t value) {
|
elements_deletion_counter_ = value;
|
}
|
|
wasm::WasmEngine* wasm_engine() const { return wasm_engine_.get(); }
|
void set_wasm_engine(std::shared_ptr<wasm::WasmEngine> engine) {
|
DCHECK_NULL(wasm_engine_); // Only call once before {Init}.
|
wasm_engine_ = std::move(engine);
|
}
|
|
const v8::Context::BackupIncumbentScope* top_backup_incumbent_scope() const {
|
return top_backup_incumbent_scope_;
|
}
|
void set_top_backup_incumbent_scope(
|
const v8::Context::BackupIncumbentScope* top_backup_incumbent_scope) {
|
top_backup_incumbent_scope_ = top_backup_incumbent_scope;
|
}
|
|
void SetIdle(bool is_idle);
|
|
protected:
|
Isolate();
|
bool IsArrayOrObjectOrStringPrototype(Object* object);
|
|
private:
|
friend struct GlobalState;
|
friend struct InitializeGlobalState;
|
|
// These fields are accessed through the API, offsets must be kept in sync
|
// with v8::internal::Internals (in include/v8.h) constants. This is also
|
// verified in Isolate::Init() using runtime checks.
|
void* embedder_data_[Internals::kNumIsolateDataSlots];
|
Heap heap_;
|
|
class ThreadDataTable {
|
public:
|
ThreadDataTable();
|
~ThreadDataTable();
|
|
PerIsolateThreadData* Lookup(ThreadId thread_id);
|
void Insert(PerIsolateThreadData* data);
|
void Remove(PerIsolateThreadData* data);
|
void RemoveAllThreads();
|
|
private:
|
struct Hasher {
|
std::size_t operator()(const ThreadId& t) const {
|
return std::hash<int>()(t.ToInteger());
|
}
|
};
|
|
std::unordered_map<ThreadId, PerIsolateThreadData*, Hasher> table_;
|
};
|
|
// These items form a stack synchronously with threads Enter'ing and Exit'ing
|
// the Isolate. The top of the stack points to a thread which is currently
|
// running the Isolate. When the stack is empty, the Isolate is considered
|
// not entered by any thread and can be Disposed.
|
// If the same thread enters the Isolate more than once, the entry_count_
|
// is incremented rather then a new item pushed to the stack.
|
class EntryStackItem {
|
public:
|
EntryStackItem(PerIsolateThreadData* previous_thread_data,
|
Isolate* previous_isolate,
|
EntryStackItem* previous_item)
|
: entry_count(1),
|
previous_thread_data(previous_thread_data),
|
previous_isolate(previous_isolate),
|
previous_item(previous_item) { }
|
|
int entry_count;
|
PerIsolateThreadData* previous_thread_data;
|
Isolate* previous_isolate;
|
EntryStackItem* previous_item;
|
|
private:
|
DISALLOW_COPY_AND_ASSIGN(EntryStackItem);
|
};
|
|
static base::Thread::LocalStorageKey per_isolate_thread_data_key_;
|
static base::Thread::LocalStorageKey isolate_key_;
|
static base::Thread::LocalStorageKey thread_id_key_;
|
|
// A global counter for all generated Isolates, might overflow.
|
static base::Atomic32 isolate_counter_;
|
|
#if DEBUG
|
static base::Atomic32 isolate_key_created_;
|
#endif
|
|
void Deinit();
|
|
static void SetIsolateThreadLocals(Isolate* isolate,
|
PerIsolateThreadData* data);
|
|
// Find the PerThread for this particular (isolate, thread) combination.
|
// If one does not yet exist, allocate a new one.
|
PerIsolateThreadData* FindOrAllocatePerThreadDataForThisThread();
|
|
// Initializes the current thread to run this Isolate.
|
// Not thread-safe. Multiple threads should not Enter/Exit the same isolate
|
// at the same time, this should be prevented using external locking.
|
void Enter();
|
|
// Exits the current thread. The previosuly entered Isolate is restored
|
// for the thread.
|
// Not thread-safe. Multiple threads should not Enter/Exit the same isolate
|
// at the same time, this should be prevented using external locking.
|
void Exit();
|
|
void InitializeThreadLocal();
|
|
void MarkCompactPrologue(bool is_compacting,
|
ThreadLocalTop* archived_thread_data);
|
void MarkCompactEpilogue(bool is_compacting,
|
ThreadLocalTop* archived_thread_data);
|
|
void FillCache();
|
|
// Propagate pending exception message to the v8::TryCatch.
|
// If there is no external try-catch or message was successfully propagated,
|
// then return true.
|
bool PropagatePendingExceptionToExternalTryCatch();
|
|
void SetTerminationOnExternalTryCatch();
|
|
void PromiseHookStateUpdated();
|
void RunPromiseHookForAsyncEventDelegate(PromiseHookType type,
|
Handle<JSPromise> promise);
|
|
const char* RAILModeName(RAILMode rail_mode) const {
|
switch (rail_mode) {
|
case PERFORMANCE_RESPONSE:
|
return "RESPONSE";
|
case PERFORMANCE_ANIMATION:
|
return "ANIMATION";
|
case PERFORMANCE_IDLE:
|
return "IDLE";
|
case PERFORMANCE_LOAD:
|
return "LOAD";
|
}
|
return "";
|
}
|
|
base::Atomic32 id_;
|
EntryStackItem* entry_stack_;
|
int stack_trace_nesting_level_;
|
StringStream* incomplete_message_;
|
Address isolate_addresses_[kIsolateAddressCount + 1]; // NOLINT
|
Bootstrapper* bootstrapper_;
|
RuntimeProfiler* runtime_profiler_;
|
CompilationCache* compilation_cache_;
|
std::shared_ptr<Counters> async_counters_;
|
base::RecursiveMutex break_access_;
|
Logger* logger_;
|
StackGuard stack_guard_;
|
StubCache* load_stub_cache_;
|
StubCache* store_stub_cache_;
|
DeoptimizerData* deoptimizer_data_;
|
bool deoptimizer_lazy_throw_;
|
MaterializedObjectStore* materialized_object_store_;
|
ThreadLocalTop thread_local_top_;
|
bool capture_stack_trace_for_uncaught_exceptions_;
|
int stack_trace_for_uncaught_exceptions_frame_limit_;
|
StackTrace::StackTraceOptions stack_trace_for_uncaught_exceptions_options_;
|
ContextSlotCache* context_slot_cache_;
|
DescriptorLookupCache* descriptor_lookup_cache_;
|
HandleScopeData handle_scope_data_;
|
HandleScopeImplementer* handle_scope_implementer_;
|
UnicodeCache* unicode_cache_;
|
AccountingAllocator* allocator_;
|
InnerPointerToCodeCache* inner_pointer_to_code_cache_;
|
GlobalHandles* global_handles_;
|
EternalHandles* eternal_handles_;
|
ThreadManager* thread_manager_;
|
RuntimeState runtime_state_;
|
Builtins builtins_;
|
SetupIsolateDelegate* setup_delegate_;
|
unibrow::Mapping<unibrow::Ecma262UnCanonicalize> jsregexp_uncanonicalize_;
|
unibrow::Mapping<unibrow::CanonicalizationRange> jsregexp_canonrange_;
|
unibrow::Mapping<unibrow::Ecma262Canonicalize>
|
regexp_macro_assembler_canonicalize_;
|
RegExpStack* regexp_stack_;
|
std::vector<int> regexp_indices_;
|
DateCache* date_cache_;
|
base::RandomNumberGenerator* random_number_generator_;
|
base::RandomNumberGenerator* fuzzer_rng_;
|
base::AtomicValue<RAILMode> rail_mode_;
|
v8::Isolate::AtomicsWaitCallback atomics_wait_callback_;
|
void* atomics_wait_callback_data_;
|
PromiseHook promise_hook_;
|
HostImportModuleDynamicallyCallback host_import_module_dynamically_callback_;
|
HostInitializeImportMetaObjectCallback
|
host_initialize_import_meta_object_callback_;
|
base::Mutex rail_mutex_;
|
double load_start_time_ms_;
|
|
#ifdef V8_INTL_SUPPORT
|
icu::RegexMatcher* language_singleton_regexp_matcher_;
|
icu::RegexMatcher* language_tag_regexp_matcher_;
|
icu::RegexMatcher* language_variant_regexp_matcher_;
|
std::string default_locale_;
|
#endif // V8_INTL_SUPPORT
|
|
// Whether the isolate has been created for snapshotting.
|
bool serializer_enabled_;
|
|
// True if fatal error has been signaled for this isolate.
|
bool has_fatal_error_;
|
|
// True if this isolate was initialized from a snapshot.
|
bool initialized_from_snapshot_;
|
|
// True if ES2015 tail call elimination feature is enabled.
|
bool is_tail_call_elimination_enabled_;
|
|
// True if the isolate is in background. This flag is used
|
// to prioritize between memory usage and latency.
|
bool is_isolate_in_background_;
|
|
// True if the isolate is in memory savings mode. This flag is used to
|
// favor memory over runtime performance.
|
bool memory_savings_mode_active_;
|
|
// Time stamp at initialization.
|
double time_millis_at_init_;
|
|
#ifdef DEBUG
|
static std::atomic<size_t> non_disposed_isolates_;
|
|
JSObject::SpillInformation js_spill_information_;
|
#endif
|
|
Debug* debug_;
|
HeapProfiler* heap_profiler_;
|
std::unique_ptr<CodeEventDispatcher> code_event_dispatcher_;
|
FunctionEntryHook function_entry_hook_;
|
|
const AstStringConstants* ast_string_constants_;
|
|
interpreter::Interpreter* interpreter_;
|
|
CompilerDispatcher* compiler_dispatcher_;
|
|
typedef std::pair<InterruptCallback, void*> InterruptEntry;
|
std::queue<InterruptEntry> api_interrupts_queue_;
|
|
#define GLOBAL_BACKING_STORE(type, name, initialvalue) \
|
type name##_;
|
ISOLATE_INIT_LIST(GLOBAL_BACKING_STORE)
|
#undef GLOBAL_BACKING_STORE
|
|
#define GLOBAL_ARRAY_BACKING_STORE(type, name, length) \
|
type name##_[length];
|
ISOLATE_INIT_ARRAY_LIST(GLOBAL_ARRAY_BACKING_STORE)
|
#undef GLOBAL_ARRAY_BACKING_STORE
|
|
#ifdef DEBUG
|
// This class is huge and has a number of fields controlled by
|
// preprocessor defines. Make sure the offsets of these fields agree
|
// between compilation units.
|
#define ISOLATE_FIELD_OFFSET(type, name, ignored) \
|
static const intptr_t name##_debug_offset_;
|
ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
|
ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
|
#undef ISOLATE_FIELD_OFFSET
|
#endif
|
|
DeferredHandles* deferred_handles_head_;
|
OptimizingCompileDispatcher* optimizing_compile_dispatcher_;
|
|
// Counts deopt points if deopt_every_n_times is enabled.
|
unsigned int stress_deopt_count_;
|
|
bool force_slow_path_;
|
|
int next_optimization_id_;
|
|
#if V8_SFI_HAS_UNIQUE_ID
|
int next_unique_sfi_id_;
|
#endif
|
|
// Vector of callbacks before a Call starts execution.
|
std::vector<BeforeCallEnteredCallback> before_call_entered_callbacks_;
|
|
// Vector of callbacks when a Call completes.
|
std::vector<CallCompletedCallback> call_completed_callbacks_;
|
|
// Vector of callbacks after microtasks were run.
|
std::vector<MicrotasksCompletedCallback> microtasks_completed_callbacks_;
|
bool is_running_microtasks_;
|
|
v8::Isolate::UseCounterCallback use_counter_callback_;
|
|
std::vector<Object*> partial_snapshot_cache_;
|
|
// Used during builtins compilation to build the builtins constants table,
|
// which is stored on the root list prior to serialization.
|
BuiltinsConstantsTableBuilder* builtins_constants_table_builder_ = nullptr;
|
|
void SetEmbeddedBlob(const uint8_t* blob, uint32_t blob_size);
|
|
const uint8_t* embedded_blob_ = nullptr;
|
uint32_t embedded_blob_size_ = 0;
|
|
v8::ArrayBuffer::Allocator* array_buffer_allocator_;
|
|
FutexWaitListNode futex_wait_list_node_;
|
|
CancelableTaskManager* cancelable_task_manager_;
|
|
debug::ConsoleDelegate* console_delegate_ = nullptr;
|
|
debug::AsyncEventDelegate* async_event_delegate_ = nullptr;
|
bool promise_hook_or_async_event_delegate_ = false;
|
int async_task_count_ = 0;
|
|
v8::Isolate::AbortOnUncaughtExceptionCallback
|
abort_on_uncaught_exception_callback_;
|
|
bool allow_atomics_wait_;
|
|
ManagedPtrDestructor* managed_ptr_destructors_head_ = nullptr;
|
|
size_t total_regexp_code_generated_;
|
|
size_t elements_deletion_counter_ = 0;
|
|
std::shared_ptr<wasm::WasmEngine> wasm_engine_;
|
|
std::unique_ptr<TracingCpuProfilerImpl> tracing_cpu_profiler_;
|
|
// The top entry of the v8::Context::BackupIncumbentScope stack.
|
const v8::Context::BackupIncumbentScope* top_backup_incumbent_scope_ =
|
nullptr;
|
|
// TODO(kenton@cloudflare.com): This mutex can be removed if
|
// thread_data_table_ is always accessed under the isolate lock. I do not
|
// know if this is the case, so I'm preserving it for now.
|
base::Mutex thread_data_table_mutex_;
|
ThreadDataTable thread_data_table_;
|
|
friend class ExecutionAccess;
|
friend class HandleScopeImplementer;
|
friend class heap::HeapTester;
|
friend class OptimizingCompileDispatcher;
|
friend class Simulator;
|
friend class StackGuard;
|
friend class SweeperThread;
|
friend class TestIsolate;
|
friend class ThreadId;
|
friend class ThreadManager;
|
friend class v8::Isolate;
|
friend class v8::Locker;
|
friend class v8::SnapshotCreator;
|
friend class v8::Unlocker;
|
|
DISALLOW_COPY_AND_ASSIGN(Isolate);
|
};
|
|
|
#undef FIELD_ACCESSOR
|
#undef THREAD_LOCAL_TOP_ACCESSOR
|
|
|
class PromiseOnStack {
|
public:
|
PromiseOnStack(Handle<JSObject> promise, PromiseOnStack* prev)
|
: promise_(promise), prev_(prev) {}
|
Handle<JSObject> promise() { return promise_; }
|
PromiseOnStack* prev() { return prev_; }
|
|
private:
|
Handle<JSObject> promise_;
|
PromiseOnStack* prev_;
|
};
|
|
|
// If the GCC version is 4.1.x or 4.2.x an additional field is added to the
|
// class as a work around for a bug in the generated code found with these
|
// versions of GCC. See V8 issue 122 for details.
|
class SaveContext BASE_EMBEDDED {
|
public:
|
explicit SaveContext(Isolate* isolate);
|
~SaveContext();
|
|
Handle<Context> context() { return context_; }
|
SaveContext* prev() { return prev_; }
|
|
// Returns true if this save context is below a given JavaScript frame.
|
bool IsBelowFrame(StandardFrame* frame);
|
|
private:
|
Isolate* const isolate_;
|
Handle<Context> context_;
|
SaveContext* const prev_;
|
Address c_entry_fp_;
|
};
|
|
|
class AssertNoContextChange BASE_EMBEDDED {
|
#ifdef DEBUG
|
public:
|
explicit AssertNoContextChange(Isolate* isolate);
|
~AssertNoContextChange() {
|
DCHECK(isolate_->context() == *context_);
|
}
|
|
private:
|
Isolate* isolate_;
|
Handle<Context> context_;
|
#else
|
public:
|
explicit AssertNoContextChange(Isolate* isolate) { }
|
#endif
|
};
|
|
|
class ExecutionAccess BASE_EMBEDDED {
|
public:
|
explicit ExecutionAccess(Isolate* isolate) : isolate_(isolate) {
|
Lock(isolate);
|
}
|
~ExecutionAccess() { Unlock(isolate_); }
|
|
static void Lock(Isolate* isolate) { isolate->break_access()->Lock(); }
|
static void Unlock(Isolate* isolate) { isolate->break_access()->Unlock(); }
|
|
static bool TryLock(Isolate* isolate) {
|
return isolate->break_access()->TryLock();
|
}
|
|
private:
|
Isolate* isolate_;
|
};
|
|
|
// Support for checking for stack-overflows.
|
class StackLimitCheck BASE_EMBEDDED {
|
public:
|
explicit StackLimitCheck(Isolate* isolate) : isolate_(isolate) { }
|
|
// Use this to check for stack-overflows in C++ code.
|
bool HasOverflowed() const {
|
StackGuard* stack_guard = isolate_->stack_guard();
|
return GetCurrentStackPosition() < stack_guard->real_climit();
|
}
|
|
// Use this to check for interrupt request in C++ code.
|
bool InterruptRequested() {
|
StackGuard* stack_guard = isolate_->stack_guard();
|
return GetCurrentStackPosition() < stack_guard->climit();
|
}
|
|
// Use this to check for stack-overflow when entering runtime from JS code.
|
bool JsHasOverflowed(uintptr_t gap = 0) const;
|
|
private:
|
Isolate* isolate_;
|
};
|
|
#define STACK_CHECK(isolate, result_value) \
|
do { \
|
StackLimitCheck stack_check(isolate); \
|
if (stack_check.HasOverflowed()) { \
|
isolate->StackOverflow(); \
|
return result_value; \
|
} \
|
} while (false)
|
|
// Scope intercepts only interrupt which is part of its interrupt_mask and does
|
// not affect other interrupts.
|
class InterruptsScope {
|
public:
|
enum Mode { kPostponeInterrupts, kRunInterrupts, kNoop };
|
|
virtual ~InterruptsScope() {
|
if (mode_ != kNoop) stack_guard_->PopInterruptsScope();
|
}
|
|
// Find the scope that intercepts this interrupt.
|
// It may be outermost PostponeInterruptsScope or innermost
|
// SafeForInterruptsScope if any.
|
// Return whether the interrupt has been intercepted.
|
bool Intercept(StackGuard::InterruptFlag flag);
|
|
InterruptsScope(Isolate* isolate, int intercept_mask, Mode mode)
|
: stack_guard_(isolate->stack_guard()),
|
intercept_mask_(intercept_mask),
|
intercepted_flags_(0),
|
mode_(mode) {
|
if (mode_ != kNoop) stack_guard_->PushInterruptsScope(this);
|
}
|
|
private:
|
StackGuard* stack_guard_;
|
int intercept_mask_;
|
int intercepted_flags_;
|
Mode mode_;
|
InterruptsScope* prev_;
|
|
friend class StackGuard;
|
};
|
|
// Support for temporarily postponing interrupts. When the outermost
|
// postpone scope is left the interrupts will be re-enabled and any
|
// interrupts that occurred while in the scope will be taken into
|
// account.
|
class PostponeInterruptsScope : public InterruptsScope {
|
public:
|
PostponeInterruptsScope(Isolate* isolate,
|
int intercept_mask = StackGuard::ALL_INTERRUPTS)
|
: InterruptsScope(isolate, intercept_mask,
|
InterruptsScope::kPostponeInterrupts) {}
|
virtual ~PostponeInterruptsScope() = default;
|
};
|
|
// Support for overriding PostponeInterruptsScope. Interrupt is not ignored if
|
// innermost scope is SafeForInterruptsScope ignoring any outer
|
// PostponeInterruptsScopes.
|
class SafeForInterruptsScope : public InterruptsScope {
|
public:
|
SafeForInterruptsScope(Isolate* isolate,
|
int intercept_mask = StackGuard::ALL_INTERRUPTS)
|
: InterruptsScope(isolate, intercept_mask,
|
InterruptsScope::kRunInterrupts) {}
|
virtual ~SafeForInterruptsScope() = default;
|
};
|
|
class StackTraceFailureMessage {
|
public:
|
explicit StackTraceFailureMessage(Isolate* isolate, void* ptr1 = nullptr,
|
void* ptr2 = nullptr, void* ptr3 = nullptr,
|
void* ptr4 = nullptr);
|
|
V8_NOINLINE void Print() volatile;
|
|
static const uintptr_t kStartMarker = 0xdecade30;
|
static const uintptr_t kEndMarker = 0xdecade31;
|
static const int kStacktraceBufferSize = 32 * KB;
|
|
uintptr_t start_marker_ = kStartMarker;
|
void* isolate_;
|
void* ptr1_;
|
void* ptr2_;
|
void* ptr3_;
|
void* ptr4_;
|
void* code_objects_[4];
|
char js_stack_trace_[kStacktraceBufferSize];
|
uintptr_t end_marker_ = kEndMarker;
|
};
|
|
} // namespace internal
|
} // namespace v8
|
|
#endif // V8_ISOLATE_H_
|
