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// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_ISOLATE_H_
#define V8_ISOLATE_H_
#include "../include/v8-debug.h"
#include "allocation.h"
#include "apiutils.h"
#include "assert-scope.h"
#include "atomicops.h"
#include "builtins.h"
#include "contexts.h"
#include "execution.h"
#include "frames.h"
#include "date.h"
#include "global-handles.h"
#include "handles.h"
#include "hashmap.h"
#include "heap.h"
#include "optimizing-compiler-thread.h"
#include "regexp-stack.h"
#include "runtime-profiler.h"
#include "runtime.h"
#include "zone.h"
namespace v8 {
namespace internal {
class Bootstrapper;
class CodeGenerator;
class CodeRange;
struct CodeStubInterfaceDescriptor;
class CodeTracer;
class CompilationCache;
class ContextSlotCache;
class Counters;
class CpuFeatures;
class CpuProfiler;
class DeoptimizerData;
class Deserializer;
class EmptyStatement;
class ExternalCallbackScope;
class ExternalReferenceTable;
class Factory;
class FunctionInfoListener;
class HandleScopeImplementer;
class HeapProfiler;
class HStatistics;
class HTracer;
class InlineRuntimeFunctionsTable;
class NoAllocationStringAllocator;
class InnerPointerToCodeCache;
class RandomNumberGenerator;
class RegExpStack;
class SaveContext;
class UnicodeCache;
class ConsStringIteratorOp;
class StringTracker;
class StubCache;
class SweeperThread;
class ThreadManager;
class ThreadState;
class ThreadVisitor; // Defined in v8threads.h
template <StateTag Tag> class VMState;
// 'void function pointer', used to roundtrip the
// ExternalReference::ExternalReferenceRedirector since we can not include
// assembler.h, where it is defined, here.
typedef void* ExternalReferenceRedirectorPointer();
#ifdef ENABLE_DEBUGGER_SUPPORT
class Debug;
class Debugger;
class DebuggerAgent;
#endif
#if !defined(__arm__) && V8_TARGET_ARCH_ARM || \
!defined(__mips__) && V8_TARGET_ARCH_MIPS
class Redirection;
class Simulator;
#endif
// Static indirection table for handles to constants. If a frame
// element represents a constant, the data contains an index into
// this table of handles to the actual constants.
// Static indirection table for handles to constants. If a Result
// represents a constant, the data contains an index into this table
// of handles to the actual constants.
typedef ZoneList<Handle<Object> > ZoneObjectList;
#define RETURN_IF_SCHEDULED_EXCEPTION(isolate) \
do { \
Isolate* __isolate__ = (isolate); \
if (__isolate__->has_scheduled_exception()) { \
return __isolate__->PromoteScheduledException(); \
} \
} while (false)
#define RETURN_HANDLE_IF_SCHEDULED_EXCEPTION(isolate, T) \
do { \
Isolate* __isolate__ = (isolate); \
if (__isolate__->has_scheduled_exception()) { \
__isolate__->PromoteScheduledException(); \
return Handle<T>::null(); \
} \
} while (false)
#define RETURN_IF_EMPTY_HANDLE_VALUE(isolate, call, value) \
do { \
if ((call).is_null()) { \
ASSERT((isolate)->has_pending_exception()); \
return (value); \
} \
} while (false)
#define CHECK_NOT_EMPTY_HANDLE(isolate, call) \
do { \
ASSERT(!(isolate)->has_pending_exception()); \
CHECK(!(call).is_null()); \
CHECK(!(isolate)->has_pending_exception()); \
} while (false)
#define RETURN_IF_EMPTY_HANDLE(isolate, call) \
RETURN_IF_EMPTY_HANDLE_VALUE(isolate, call, Failure::Exception())
#define FOR_EACH_ISOLATE_ADDRESS_NAME(C) \
C(Handler, handler) \
C(CEntryFP, c_entry_fp) \
C(Context, context) \
C(PendingException, pending_exception) \
C(ExternalCaughtException, external_caught_exception) \
C(JSEntrySP, js_entry_sp)
// Platform-independent, reliable thread identifier.
class ThreadId {
public:
// Creates an invalid ThreadId.
ThreadId() : id_(kInvalidId) {}
// Returns ThreadId for current thread.
static ThreadId Current() { return ThreadId(GetCurrentThreadId()); }
// Returns invalid ThreadId (guaranteed not to be equal to any thread).
static ThreadId Invalid() { return ThreadId(kInvalidId); }
// Compares ThreadIds for equality.
INLINE(bool Equals(const ThreadId& other) const) {
return id_ == other.id_;
}
// Checks whether this ThreadId refers to any thread.
INLINE(bool IsValid() const) {
return id_ != kInvalidId;
}
// Converts ThreadId to an integer representation
// (required for public API: V8::V8::GetCurrentThreadId).
int ToInteger() const { return id_; }
// Converts ThreadId to an integer representation
// (required for public API: V8::V8::TerminateExecution).
static ThreadId FromInteger(int id) { return ThreadId(id); }
private:
static const int kInvalidId = -1;
explicit ThreadId(int id) : id_(id) {}
static int AllocateThreadId();
static int GetCurrentThreadId();
int id_;
static Atomic32 highest_thread_id_;
friend class Isolate;
};
class ThreadLocalTop BASE_EMBEDDED {
public:
// Does early low-level initialization that does not depend on the
// isolate being present.
ThreadLocalTop();
// Initialize the thread data.
void Initialize();
// Get the top C++ try catch handler or NULL if none are registered.
//
// This method is not guarenteed to return an address that can be
// used for comparison with addresses into the JS stack. If such an
// address is needed, use try_catch_handler_address.
v8::TryCatch* TryCatchHandler();
// Get the address of the top C++ try catch handler or NULL if
// none are registered.
//
// This method always returns an address that can be compared to
// pointers into the JavaScript stack. When running on actual
// hardware, try_catch_handler_address and TryCatchHandler return
// the same pointer. When running on a simulator with a separate JS
// stack, try_catch_handler_address returns a JS stack address that
// corresponds to the place on the JS stack where the C++ handler
// would have been if the stack were not separate.
inline Address try_catch_handler_address() {
return try_catch_handler_address_;
}
// Set the address of the top C++ try catch handler.
inline void set_try_catch_handler_address(Address address) {
try_catch_handler_address_ = address;
}
void Free() {
ASSERT(!has_pending_message_);
ASSERT(!external_caught_exception_);
ASSERT(try_catch_handler_address_ == NULL);
}
Isolate* isolate_;
// The context where the current execution method is created and for variable
// lookups.
Context* context_;
ThreadId thread_id_;
MaybeObject* pending_exception_;
bool has_pending_message_;
bool rethrowing_message_;
Object* pending_message_obj_;
Object* pending_message_script_;
int pending_message_start_pos_;
int pending_message_end_pos_;
// Use a separate value for scheduled exceptions to preserve the
// invariants that hold about pending_exception. We may want to
// unify them later.
MaybeObject* scheduled_exception_;
bool external_caught_exception_;
SaveContext* save_context_;
v8::TryCatch* catcher_;
// Stack.
Address c_entry_fp_; // the frame pointer of the top c entry frame
Address handler_; // try-blocks are chained through the stack
#ifdef USE_SIMULATOR
Simulator* simulator_;
#endif
Address js_entry_sp_; // the stack pointer of the bottom JS entry frame
// the external callback we're currently in
ExternalCallbackScope* external_callback_scope_;
StateTag current_vm_state_;
// Generated code scratch locations.
int32_t formal_count_;
// Call back function to report unsafe JS accesses.
v8::FailedAccessCheckCallback failed_access_check_callback_;
// Head of the list of live LookupResults.
LookupResult* top_lookup_result_;
// Whether out of memory exceptions should be ignored.
bool ignore_out_of_memory_;
private:
void InitializeInternal();
Address try_catch_handler_address_;
};
#ifdef ENABLE_DEBUGGER_SUPPORT
#define ISOLATE_DEBUGGER_INIT_LIST(V) \
V(DebuggerAgent*, debugger_agent_instance, NULL)
#else
#define ISOLATE_DEBUGGER_INIT_LIST(V)
#endif
#ifdef DEBUG
#define ISOLATE_INIT_DEBUG_ARRAY_LIST(V) \
V(CommentStatistic, paged_space_comments_statistics, \
CommentStatistic::kMaxComments + 1)
#else
#define ISOLATE_INIT_DEBUG_ARRAY_LIST(V)
#endif
#define ISOLATE_INIT_ARRAY_LIST(V) \
/* SerializerDeserializer state. */ \
V(int32_t, jsregexp_static_offsets_vector, kJSRegexpStaticOffsetsVectorSize) \
V(int, bad_char_shift_table, kUC16AlphabetSize) \
V(int, good_suffix_shift_table, (kBMMaxShift + 1)) \
V(int, suffix_table, (kBMMaxShift + 1)) \
V(uint32_t, private_random_seed, 2) \
ISOLATE_INIT_DEBUG_ARRAY_LIST(V)
typedef List<HeapObject*> DebugObjectCache;
#define ISOLATE_INIT_LIST(V) \
/* SerializerDeserializer state. */ \
V(int, serialize_partial_snapshot_cache_length, 0) \
V(int, serialize_partial_snapshot_cache_capacity, 0) \
V(Object**, serialize_partial_snapshot_cache, NULL) \
/* Assembler state. */ \
/* A previously allocated buffer of kMinimalBufferSize bytes, or NULL. */ \
V(byte*, assembler_spare_buffer, NULL) \
V(FatalErrorCallback, exception_behavior, NULL) \
V(AllowCodeGenerationFromStringsCallback, allow_code_gen_callback, NULL) \
/* To distinguish the function templates, so that we can find them in the */ \
/* function cache of the native context. */ \
V(int, next_serial_number, 0) \
V(ExternalReferenceRedirectorPointer*, external_reference_redirector, NULL) \
V(bool, always_allow_natives_syntax, false) \
/* Part of the state of liveedit. */ \
V(FunctionInfoListener*, active_function_info_listener, NULL) \
/* State for Relocatable. */ \
V(Relocatable*, relocatable_top, NULL) \
V(DebugObjectCache*, string_stream_debug_object_cache, NULL) \
V(Object*, string_stream_current_security_token, NULL) \
/* TODO(isolates): Release this on destruction? */ \
V(int*, irregexp_interpreter_backtrack_stack_cache, NULL) \
/* Serializer state. */ \
V(ExternalReferenceTable*, external_reference_table, NULL) \
/* AstNode state. */ \
V(int, ast_node_id, 0) \
V(unsigned, ast_node_count, 0) \
V(bool, microtask_pending, false) \
V(HStatistics*, hstatistics, NULL) \
V(HTracer*, htracer, NULL) \
V(CodeTracer*, code_tracer, NULL) \
ISOLATE_DEBUGGER_INIT_LIST(V)
class Isolate {
// These forward declarations are required to make the friend declarations in
// PerIsolateThreadData work on some older versions of gcc.
class ThreadDataTable;
class EntryStackItem;
public:
~Isolate();
// A thread has a PerIsolateThreadData instance for each isolate that it has
// entered. That instance is allocated when the isolate is initially entered
// and reused on subsequent entries.
class PerIsolateThreadData {
public:
PerIsolateThreadData(Isolate* isolate, ThreadId thread_id)
: isolate_(isolate),
thread_id_(thread_id),
stack_limit_(0),
thread_state_(NULL),
#if !defined(__arm__) && V8_TARGET_ARCH_ARM || \
!defined(__mips__) && V8_TARGET_ARCH_MIPS
simulator_(NULL),
#endif
next_(NULL),
prev_(NULL) { }
Isolate* isolate() const { return isolate_; }
ThreadId thread_id() const { return thread_id_; }
void set_stack_limit(uintptr_t value) { stack_limit_ = value; }
uintptr_t stack_limit() const { return stack_limit_; }
ThreadState* thread_state() const { return thread_state_; }
void set_thread_state(ThreadState* value) { thread_state_ = value; }
#if !defined(__arm__) && V8_TARGET_ARCH_ARM || \
!defined(__mips__) && V8_TARGET_ARCH_MIPS
Simulator* simulator() const { return simulator_; }
void set_simulator(Simulator* simulator) {
simulator_ = simulator;
}
#endif
bool Matches(Isolate* isolate, ThreadId thread_id) const {
return isolate_ == isolate && thread_id_.Equals(thread_id);
}
private:
Isolate* isolate_;
ThreadId thread_id_;
uintptr_t stack_limit_;
ThreadState* thread_state_;
#if !defined(__arm__) && V8_TARGET_ARCH_ARM || \
!defined(__mips__) && V8_TARGET_ARCH_MIPS
Simulator* simulator_;
#endif
PerIsolateThreadData* next_;
PerIsolateThreadData* prev_;
friend class Isolate;
friend class ThreadDataTable;
friend class EntryStackItem;
DISALLOW_COPY_AND_ASSIGN(PerIsolateThreadData);
};
enum AddressId {
#define DECLARE_ENUM(CamelName, hacker_name) k##CamelName##Address,
FOR_EACH_ISOLATE_ADDRESS_NAME(DECLARE_ENUM)
#undef DECLARE_ENUM
kIsolateAddressCount
};
// Returns the PerIsolateThreadData for the current thread (or NULL if one is
// not currently set).
static PerIsolateThreadData* CurrentPerIsolateThreadData() {
return reinterpret_cast<PerIsolateThreadData*>(
Thread::GetThreadLocal(per_isolate_thread_data_key_));
}
// Returns the isolate inside which the current thread is running.
INLINE(static Isolate* Current()) {
Isolate* isolate = reinterpret_cast<Isolate*>(
Thread::GetExistingThreadLocal(isolate_key_));
ASSERT(isolate != NULL);
return isolate;
}
INLINE(static Isolate* UncheckedCurrent()) {
return reinterpret_cast<Isolate*>(Thread::GetThreadLocal(isolate_key_));
}
// 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 Init(Deserializer* des);
bool IsInitialized() { return state_ == INITIALIZED; }
// True if at least one thread Enter'ed this isolate.
bool IsInUse() { return entry_stack_ != NULL; }
// Destroys the non-default isolates.
// Sets default isolate into "has_been_disposed" state rather then destroying,
// for legacy API reasons.
void TearDown();
static void GlobalTearDown();
bool IsDefaultIsolate() const { return this == default_isolate_; }
static void SetCrashIfDefaultIsolateInitialized();
// Ensures that process-wide resources and the default isolate have been
// allocated. It is only necessary to call this method in rare cases, for
// example if you are using V8 from within the body of a static initializer.
// Safe to call multiple times.
static void EnsureDefaultIsolate();
// 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);
#ifdef ENABLE_DEBUGGER_SUPPORT
// Get the debugger from the default isolate. Preinitializes the
// default isolate if needed.
static Debugger* GetDefaultIsolateDebugger();
#endif
// Get the stack guard from the default isolate. Preinitializes the
// default isolate if needed.
static StackGuard* GetDefaultIsolateStackGuard();
// 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 Thread::LocalStorageKey isolate_key() {
return isolate_key_;
}
// Returns the key used to store process-wide thread IDs.
static Thread::LocalStorageKey thread_id_key() {
return thread_id_key_;
}
static Thread::LocalStorageKey per_isolate_thread_data_key();
// If a client attempts to create a Locker without specifying an isolate,
// we assume that the client is using legacy behavior. Set up the current
// thread to be inside the implicit isolate (or fail a check if we have
// switched to non-legacy behavior).
static void EnterDefaultIsolate();
// Mutex for serializing access to break control structures.
RecursiveMutex* break_access() { return &break_access_; }
// Mutex for serializing access to debugger.
RecursiveMutex* debugger_access() { return &debugger_access_; }
Address get_address_from_id(AddressId id);
// Access to top context (where the current function object was created).
Context* context() { return thread_local_top_.context_; }
void set_context(Context* context) {
ASSERT(context == NULL || context->IsContext());
thread_local_top_.context_ = context;
}
Context** context_address() { return &thread_local_top_.context_; }
SaveContext* save_context() { return thread_local_top_.save_context_; }
void set_save_context(SaveContext* save) {
thread_local_top_.save_context_ = save;
}
// Access to current thread id.
ThreadId thread_id() { return thread_local_top_.thread_id_; }
void set_thread_id(ThreadId id) { thread_local_top_.thread_id_ = id; }
// Interface to pending exception.
MaybeObject* pending_exception() {
ASSERT(has_pending_exception());
return thread_local_top_.pending_exception_;
}
bool external_caught_exception() {
return thread_local_top_.external_caught_exception_;
}
void set_external_caught_exception(bool value) {
thread_local_top_.external_caught_exception_ = value;
}
void set_pending_exception(MaybeObject* exception) {
thread_local_top_.pending_exception_ = exception;
}
void clear_pending_exception() {
thread_local_top_.pending_exception_ = heap_.the_hole_value();
}
MaybeObject** pending_exception_address() {
return &thread_local_top_.pending_exception_;
}
bool has_pending_exception() {
return !thread_local_top_.pending_exception_->IsTheHole();
}
void clear_pending_message() {
thread_local_top_.has_pending_message_ = false;
thread_local_top_.pending_message_obj_ = heap_.the_hole_value();
thread_local_top_.pending_message_script_ = heap_.the_hole_value();
}
v8::TryCatch* try_catch_handler() {
return thread_local_top_.TryCatchHandler();
}
Address try_catch_handler_address() {
return thread_local_top_.try_catch_handler_address();
}
bool* external_caught_exception_address() {
return &thread_local_top_.external_caught_exception_;
}
v8::TryCatch* catcher() {
return thread_local_top_.catcher_;
}
void set_catcher(v8::TryCatch* catcher) {
thread_local_top_.catcher_ = catcher;
}
MaybeObject** scheduled_exception_address() {
return &thread_local_top_.scheduled_exception_;
}
Address pending_message_obj_address() {
return reinterpret_cast<Address>(&thread_local_top_.pending_message_obj_);
}
Address has_pending_message_address() {
return reinterpret_cast<Address>(&thread_local_top_.has_pending_message_);
}
Address pending_message_script_address() {
return reinterpret_cast<Address>(
&thread_local_top_.pending_message_script_);
}
MaybeObject* scheduled_exception() {
ASSERT(has_scheduled_exception());
return thread_local_top_.scheduled_exception_;
}
bool has_scheduled_exception() {
return thread_local_top_.scheduled_exception_ != heap_.the_hole_value();
}
void clear_scheduled_exception() {
thread_local_top_.scheduled_exception_ = heap_.the_hole_value();
}
bool IsExternallyCaught();
bool is_catchable_by_javascript(MaybeObject* exception) {
return (!exception->IsOutOfMemory()) &&
(exception != heap()->termination_exception());
}
// Serializer.
void PushToPartialSnapshotCache(Object* obj);
// 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_; }
inline Address* c_entry_fp_address() {
return &thread_local_top_.c_entry_fp_;
}
inline Address* handler_address() { return &thread_local_top_.handler_; }
// 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_;
}
// Generated code scratch locations.
void* formal_count_address() { return &thread_local_top_.formal_count_; }
// Returns the global object of the current context. It could be
// a builtin object, or a JS global object.
Handle<GlobalObject> global_object() {
return Handle<GlobalObject>(context()->global_object());
}
// Returns the global proxy object of the current context.
Object* global_proxy() {
return context()->global_proxy();
}
Handle<JSBuiltinsObject> js_builtins_object() {
return Handle<JSBuiltinsObject>(thread_local_top_.context_->builtins());
}
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.
bool OptionalRescheduleException(bool is_bottom_call);
class ExceptionScope {
public:
explicit ExceptionScope(Isolate* isolate) :
// Scope currently can only be used for regular exceptions, not
// failures like OOM or termination exception.
isolate_(isolate),
pending_exception_(isolate_->pending_exception()->ToObjectUnchecked(),
isolate_),
catcher_(isolate_->catcher())
{ }
~ExceptionScope() {
isolate_->set_catcher(catcher_);
isolate_->set_pending_exception(*pending_exception_);
}
private:
Isolate* isolate_;
Handle<Object> pending_exception_;
v8::TryCatch* catcher_;
};
void SetCaptureStackTraceForUncaughtExceptions(
bool capture,
int frame_limit,
StackTrace::StackTraceOptions options);
// Tells whether the current context has experienced an out of memory
// exception.
bool is_out_of_memory();
bool ignore_out_of_memory() {
return thread_local_top_.ignore_out_of_memory_;
}
void set_ignore_out_of_memory(bool value) {
thread_local_top_.ignore_out_of_memory_ = value;
}
void PrintCurrentStackTrace(FILE* out);
void PrintStack(StringStream* accumulator);
void PrintStack(FILE* out);
Handle<String> StackTraceString();
NO_INLINE(void PushStackTraceAndDie(unsigned int magic,
Object* object,
Map* map,
unsigned int magic2));
Handle<JSArray> CaptureCurrentStackTrace(
int frame_limit,
StackTrace::StackTraceOptions options);
Handle<JSArray> CaptureSimpleStackTrace(Handle<JSObject> error_object,
Handle<Object> caller,
int limit);
void CaptureAndSetDetailedStackTrace(Handle<JSObject> error_object);
// Returns if the top context may access the given global object. If
// the result is false, the pending exception is guaranteed to be
// set.
// TODO(yangguo): temporary wrappers
bool MayNamedAccessWrapper(Handle<JSObject> receiver,
Handle<Object> key,
v8::AccessType type) {
return MayNamedAccess(*receiver, *key, type);
}
bool MayIndexedAccessWrapper(Handle<JSObject> receiver,
uint32_t index,
v8::AccessType type) {
return MayIndexedAccess(*receiver, index, type);
}
bool MayNamedAccess(JSObject* receiver,
Object* key,
v8::AccessType type);
bool MayIndexedAccess(JSObject* receiver,
uint32_t index,
v8::AccessType type);
void SetFailedAccessCheckCallback(v8::FailedAccessCheckCallback callback);
void ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type);
// Exception throwing support. The caller should use the result
// of Throw() as its return value.
Failure* Throw(Object* exception, MessageLocation* location = NULL);
// Re-throw an exception. This involves no error reporting since
// error reporting was handled when the exception was thrown
// originally.
Failure* ReThrow(MaybeObject* exception);
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);
void ReportPendingMessages();
// Return pending location if any or unfilled structure.
MessageLocation GetMessageLocation();
Failure* ThrowIllegalOperation();
// Promote a scheduled exception to pending. Asserts has_scheduled_exception.
Failure* PromoteScheduledException();
void DoThrow(Object* exception, MessageLocation* location);
// Checks if exception should be reported and finds out if it's
// caught externally.
bool ShouldReportException(bool* can_be_caught_externally,
bool catchable_by_javascript);
// Attempts to compute the current source location, storing the
// result in the target out parameter.
void ComputeLocation(MessageLocation* target);
// Override command line flag.
void TraceException(bool flag);
// Out of resource exception helpers.
Failure* StackOverflow();
Failure* TerminateExecution();
void CancelTerminateExecution();
// Administration
void Iterate(ObjectVisitor* v);
void Iterate(ObjectVisitor* v, ThreadLocalTop* t);
char* Iterate(ObjectVisitor* v, char* t);
void IterateThread(ThreadVisitor* v, char* t);
// Returns the current native and global context.
Handle<Context> native_context();
Handle<Context> global_context();
// Returns the native context of the calling JavaScript code. That
// is, the native context of the top-most JavaScript frame.
Handle<Context> GetCallingNativeContext();
void RegisterTryCatchHandler(v8::TryCatch* that);
void UnregisterTryCatchHandler(v8::TryCatch* that);
char* ArchiveThread(char* to);
char* RestoreThread(char* from);
static const char* const kStackOverflowMessage;
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 { \
ASSERT(OFFSET_OF(Isolate, name##_) == name##_debug_offset_); \
return name##_; \
} \
inline void set_##name(type value) { \
ASSERT(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() { \
ASSERT(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) \
Handle<type> name() { \
return Handle<type>(context()->native_context()->name(), this); \
} \
bool is_##name(type* value) { \
return context()->native_context()->is_##name(value); \
}
NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSOR)
#undef NATIVE_CONTEXT_FIELD_ACCESSOR
Bootstrapper* bootstrapper() { return bootstrapper_; }
Counters* counters() {
// Call InitializeLoggingAndCounters() if logging is needed before
// the isolate is fully initialized.
ASSERT(counters_ != NULL);
return counters_;
}
CodeRange* code_range() { return code_range_; }
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.
ASSERT(logger_ != NULL);
return logger_;
}
StackGuard* stack_guard() { return &stack_guard_; }
Heap* heap() { return &heap_; }
StatsTable* stats_table();
StubCache* stub_cache() { return stub_cache_; }
DeoptimizerData* deoptimizer_data() { return deoptimizer_data_; }
ThreadLocalTop* thread_local_top() { return &thread_local_top_; }
TranscendentalCache* transcendental_cache() const {
return transcendental_cache_;
}
MemoryAllocator* memory_allocator() {
return memory_allocator_;
}
KeyedLookupCache* keyed_lookup_cache() {
return keyed_lookup_cache_;
}
ContextSlotCache* context_slot_cache() {
return context_slot_cache_;
}
DescriptorLookupCache* descriptor_lookup_cache() {
return descriptor_lookup_cache_;
}
v8::ImplementationUtilities::HandleScopeData* handle_scope_data() {
return &handle_scope_data_;
}
HandleScopeImplementer* handle_scope_implementer() {
ASSERT(handle_scope_implementer_);
return handle_scope_implementer_;
}
Zone* runtime_zone() { return &runtime_zone_; }
UnicodeCache* unicode_cache() {
return unicode_cache_;
}
InnerPointerToCodeCache* inner_pointer_to_code_cache() {
return inner_pointer_to_code_cache_;
}
ConsStringIteratorOp* write_iterator() { return write_iterator_; }
GlobalHandles* global_handles() { return global_handles_; }
EternalHandles* eternal_handles() { return eternal_handles_; }
ThreadManager* thread_manager() { return thread_manager_; }
StringTracker* string_tracker() { return string_tracker_; }
unibrow::Mapping<unibrow::Ecma262UnCanonicalize>* jsregexp_uncanonicalize() {
return &jsregexp_uncanonicalize_;
}
unibrow::Mapping<unibrow::CanonicalizationRange>* jsregexp_canonrange() {
return &jsregexp_canonrange_;
}
ConsStringIteratorOp* objects_string_compare_iterator_a() {
return &objects_string_compare_iterator_a_;
}
ConsStringIteratorOp* objects_string_compare_iterator_b() {
return &objects_string_compare_iterator_b_;
}
StaticResource<ConsStringIteratorOp>* objects_string_iterator() {
return &objects_string_iterator_;
}
RuntimeState* runtime_state() { return &runtime_state_; }
void set_fp_stubs_generated(bool value) {
fp_stubs_generated_ = value;
}
bool fp_stubs_generated() { return fp_stubs_generated_; }
Builtins* builtins() { return &builtins_; }
void NotifyExtensionInstalled() {
has_installed_extensions_ = true;
}
bool has_installed_extensions() { return has_installed_extensions_; }
unibrow::Mapping<unibrow::Ecma262Canonicalize>*
regexp_macro_assembler_canonicalize() {
return &regexp_macro_assembler_canonicalize_;
}
RegExpStack* regexp_stack() { return regexp_stack_; }
unibrow::Mapping<unibrow::Ecma262Canonicalize>*
interp_canonicalize_mapping() {
return &interp_canonicalize_mapping_;
}
inline bool IsCodePreAgingActive();
#ifdef ENABLE_DEBUGGER_SUPPORT
Debugger* debugger() {
if (!NoBarrier_Load(&debugger_initialized_)) InitializeDebugger();
return debugger_;
}
Debug* debug() {
if (!NoBarrier_Load(&debugger_initialized_)) InitializeDebugger();
return debug_;
}
#endif
inline bool IsDebuggerActive();
inline bool DebuggerHasBreakPoints();
CpuProfiler* cpu_profiler() const { return cpu_profiler_; }
HeapProfiler* heap_profiler() const { return heap_profiler_; }
#ifdef DEBUG
HistogramInfo* heap_histograms() { return heap_histograms_; }
JSObject::SpillInformation* js_spill_information() {
return &js_spill_information_;
}
int* code_kind_statistics() { return code_kind_statistics_; }
#endif
#if V8_TARGET_ARCH_ARM && !defined(__arm__) || \
V8_TARGET_ARCH_MIPS && !defined(__mips__)
bool simulator_initialized() { return simulator_initialized_; }
void set_simulator_initialized(bool initialized) {
simulator_initialized_ = initialized;
}
HashMap* simulator_i_cache() { return simulator_i_cache_; }
void set_simulator_i_cache(HashMap* hash_map) {
simulator_i_cache_ = hash_map;
}
Redirection* simulator_redirection() {
return simulator_redirection_;
}
void set_simulator_redirection(Redirection* redirection) {
simulator_redirection_ = redirection;
}
#endif
Factory* factory() { return reinterpret_cast<Factory*>(this); }
static const int kJSRegexpStaticOffsetsVectorSize = 128;
ExternalCallbackScope* external_callback_scope() {
return thread_local_top_.external_callback_scope_;
}
void set_external_callback_scope(ExternalCallbackScope* scope) {
thread_local_top_.external_callback_scope_ = scope;
}
StateTag current_vm_state() {
return thread_local_top_.current_vm_state_;
}
void set_current_vm_state(StateTag state) {
thread_local_top_.current_vm_state_ = state;
}
void SetData(uint32_t slot, void* data) {
ASSERT(slot < Internals::kNumIsolateDataSlots);
embedder_data_[slot] = data;
}
void* GetData(uint32_t slot) {
ASSERT(slot < Internals::kNumIsolateDataSlots);
return embedder_data_[slot];
}
LookupResult* top_lookup_result() {
return thread_local_top_.top_lookup_result_;
}
void SetTopLookupResult(LookupResult* top) {
thread_local_top_.top_lookup_result_ = top;
}
bool IsDead() { return has_fatal_error_; }
void SignalFatalError() { has_fatal_error_ = true; }
bool use_crankshaft() const { return use_crankshaft_; }
bool initialized_from_snapshot() { return initialized_from_snapshot_; }
double time_millis_since_init() {
return OS::TimeCurrentMillis() - 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;
}
Map* get_initial_js_array_map(ElementsKind kind);
bool IsFastArrayConstructorPrototypeChainIntact();
CodeStubInterfaceDescriptor*
code_stub_interface_descriptor(int index);
void IterateDeferredHandles(ObjectVisitor* visitor);
void LinkDeferredHandles(DeferredHandles* deferred_handles);
void UnlinkDeferredHandles(DeferredHandles* deferred_handles);
#ifdef DEBUG
bool IsDeferredHandle(Object** location);
#endif // DEBUG
void set_max_available_threads(int value) {
max_available_threads_ = value;
}
bool concurrent_recompilation_enabled() {
// Thread is only available with flag enabled.
ASSERT(optimizing_compiler_thread_ == NULL ||
FLAG_concurrent_recompilation);
return optimizing_compiler_thread_ != NULL;
}
bool concurrent_osr_enabled() const {
// Thread is only available with flag enabled.
ASSERT(optimizing_compiler_thread_ == NULL ||
FLAG_concurrent_recompilation);
return optimizing_compiler_thread_ != NULL && FLAG_concurrent_osr;
}
OptimizingCompilerThread* optimizing_compiler_thread() {
return optimizing_compiler_thread_;
}
int num_sweeper_threads() const {
return num_sweeper_threads_;
}
SweeperThread** sweeper_threads() {
return sweeper_thread_;
}
// PreInits and returns a default isolate. Needed when a new thread tries
// to create a Locker for the first time (the lock itself is in the isolate).
// TODO(svenpanne) This method is on death row...
static v8::Isolate* GetDefaultIsolateForLocking();
int id() const { return static_cast<int>(id_); }
HStatistics* GetHStatistics();
HTracer* GetHTracer();
CodeTracer* GetCodeTracer();
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_; }
inline RandomNumberGenerator* random_number_generator();
// Given an address occupied by a live code object, return that object.
Object* FindCodeObject(Address a);
private:
Isolate();
friend struct GlobalState;
friend struct InitializeGlobalState;
enum State {
UNINITIALIZED, // Some components may not have been allocated.
INITIALIZED // All components are fully initialized.
};
// 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_;
State state_; // Will be padded to kApiPointerSize.
// The per-process lock should be acquired before the ThreadDataTable is
// modified.
class ThreadDataTable {
public:
ThreadDataTable();
~ThreadDataTable();
PerIsolateThreadData* Lookup(Isolate* isolate, ThreadId thread_id);
void Insert(PerIsolateThreadData* data);
void Remove(PerIsolateThreadData* data);
void RemoveAllThreads(Isolate* isolate);
private:
PerIsolateThreadData* list_;
};
// 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 then 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);
};
// This mutex protects highest_thread_id_, thread_data_table_ and
// default_isolate_.
static Mutex process_wide_mutex_;
static Thread::LocalStorageKey per_isolate_thread_data_key_;
static Thread::LocalStorageKey isolate_key_;
static Thread::LocalStorageKey thread_id_key_;
static Isolate* default_isolate_;
static ThreadDataTable* thread_data_table_;
// A global counter for all generated Isolates, might overflow.
static Atomic32 isolate_counter_;
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();
void PropagatePendingExceptionToExternalTryCatch();
void InitializeDebugger();
// Traverse prototype chain to find out whether the object is derived from
// the Error object.
bool IsErrorObject(Handle<Object> obj);
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_;
Counters* counters_;
CodeRange* code_range_;
RecursiveMutex break_access_;
Atomic32 debugger_initialized_;
RecursiveMutex debugger_access_;
Logger* logger_;
StackGuard stack_guard_;
StatsTable* stats_table_;
StubCache* stub_cache_;
DeoptimizerData* deoptimizer_data_;
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_;
TranscendentalCache* transcendental_cache_;
MemoryAllocator* memory_allocator_;
KeyedLookupCache* keyed_lookup_cache_;
ContextSlotCache* context_slot_cache_;
DescriptorLookupCache* descriptor_lookup_cache_;
v8::ImplementationUtilities::HandleScopeData handle_scope_data_;
HandleScopeImplementer* handle_scope_implementer_;
UnicodeCache* unicode_cache_;
Zone runtime_zone_;
InnerPointerToCodeCache* inner_pointer_to_code_cache_;
ConsStringIteratorOp* write_iterator_;
GlobalHandles* global_handles_;
EternalHandles* eternal_handles_;
ThreadManager* thread_manager_;
RuntimeState runtime_state_;
bool fp_stubs_generated_;
Builtins builtins_;
bool has_installed_extensions_;
StringTracker* string_tracker_;
unibrow::Mapping<unibrow::Ecma262UnCanonicalize> jsregexp_uncanonicalize_;
unibrow::Mapping<unibrow::CanonicalizationRange> jsregexp_canonrange_;
ConsStringIteratorOp objects_string_compare_iterator_a_;
ConsStringIteratorOp objects_string_compare_iterator_b_;
StaticResource<ConsStringIteratorOp> objects_string_iterator_;
unibrow::Mapping<unibrow::Ecma262Canonicalize>
regexp_macro_assembler_canonicalize_;
RegExpStack* regexp_stack_;
DateCache* date_cache_;
unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
CodeStubInterfaceDescriptor* code_stub_interface_descriptors_;
RandomNumberGenerator* random_number_generator_;
// True if fatal error has been signaled for this isolate.
bool has_fatal_error_;
// True if we are using the Crankshaft optimizing compiler.
bool use_crankshaft_;
// True if this isolate was initialized from a snapshot.
bool initialized_from_snapshot_;
// Time stamp at initialization.
double time_millis_at_init_;
#if V8_TARGET_ARCH_ARM && !defined(__arm__) || \
V8_TARGET_ARCH_MIPS && !defined(__mips__)
bool simulator_initialized_;
HashMap* simulator_i_cache_;
Redirection* simulator_redirection_;
#endif
#ifdef DEBUG
// A static array of histogram info for each type.
HistogramInfo heap_histograms_[LAST_TYPE + 1];
JSObject::SpillInformation js_spill_information_;
int code_kind_statistics_[Code::NUMBER_OF_KINDS];
#endif
#ifdef ENABLE_DEBUGGER_SUPPORT
Debugger* debugger_;
Debug* debug_;
#endif
CpuProfiler* cpu_profiler_;
HeapProfiler* heap_profiler_;
FunctionEntryHook function_entry_hook_;
#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_;
OptimizingCompilerThread* optimizing_compiler_thread_;
SweeperThread** sweeper_thread_;
int num_sweeper_threads_;
// TODO(yangguo): This will become obsolete once ResourceConstraints
// becomes an argument to Isolate constructor.
int max_available_threads_;
// Counts deopt points if deopt_every_n_times is enabled.
unsigned int stress_deopt_count_;
friend class ExecutionAccess;
friend class HandleScopeImplementer;
friend class IsolateInitializer;
friend class OptimizingCompilerThread;
friend class SweeperThread;
friend class ThreadManager;
friend class Simulator;
friend class StackGuard;
friend class ThreadId;
friend class TestMemoryAllocatorScope;
friend class TestCodeRangeScope;
friend class v8::Isolate;
friend class v8::Locker;
friend class v8::Unlocker;
DISALLOW_COPY_AND_ASSIGN(Isolate);
};
// 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:
inline explicit SaveContext(Isolate* isolate);
~SaveContext() {
isolate_->set_context(context_.is_null() ? NULL : *context_);
isolate_->set_save_context(prev_);
}
Handle<Context> context() { return context_; }
SaveContext* prev() { return prev_; }
// Returns true if this save context is below a given JavaScript frame.
bool IsBelowFrame(JavaScriptFrame* frame) {
return (c_entry_fp_ == 0) || (c_entry_fp_ > frame->sp());
}
private:
Isolate* isolate_;
Handle<Context> context_;
SaveContext* prev_;
Address c_entry_fp_;
};
class AssertNoContextChange BASE_EMBEDDED {
#ifdef DEBUG
public:
explicit AssertNoContextChange(Isolate* isolate)
: isolate_(isolate),
context_(isolate->context(), isolate) { }
~AssertNoContextChange() {
ASSERT(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 in C++ code.
class StackLimitCheck BASE_EMBEDDED {
public:
explicit StackLimitCheck(Isolate* isolate) : isolate_(isolate) { }
bool HasOverflowed() const {
StackGuard* stack_guard = isolate_->stack_guard();
return (reinterpret_cast<uintptr_t>(this) < stack_guard->real_climit());
}
private:
Isolate* isolate_;
};
// 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 BASE_EMBEDDED {
public:
explicit PostponeInterruptsScope(Isolate* isolate)
: stack_guard_(isolate->stack_guard()) {
stack_guard_->thread_local_.postpone_interrupts_nesting_++;
stack_guard_->DisableInterrupts();
}
~PostponeInterruptsScope() {
if (--stack_guard_->thread_local_.postpone_interrupts_nesting_ == 0) {
stack_guard_->EnableInterrupts();
}
}
private:
StackGuard* stack_guard_;
};
// Tells whether the native context is marked with out of memory.
inline bool Context::has_out_of_memory() {
return native_context()->out_of_memory()->IsTrue();
}
// Mark the native context with out of memory.
inline void Context::mark_out_of_memory() {
native_context()->set_out_of_memory(GetIsolate()->heap()->true_value());
}
class CodeTracer V8_FINAL : public Malloced {
public:
explicit CodeTracer(int isolate_id)
: file_(NULL),
scope_depth_(0) {
if (!ShouldRedirect()) {
file_ = stdout;
return;
}
if (FLAG_redirect_code_traces_to == NULL) {
OS::SNPrintF(filename_,
"code-%d-%d.asm",
OS::GetCurrentProcessId(),
isolate_id);
} else {
OS::StrNCpy(filename_, FLAG_redirect_code_traces_to, filename_.length());
}
WriteChars(filename_.start(), "", 0, false);
}
class Scope {
public:
explicit Scope(CodeTracer* tracer) : tracer_(tracer) { tracer->OpenFile(); }
~Scope() { tracer_->CloseFile(); }
FILE* file() const { return tracer_->file(); }
private:
CodeTracer* tracer_;
};
void OpenFile() {
if (!ShouldRedirect()) {
return;
}
if (file_ == NULL) {
file_ = OS::FOpen(filename_.start(), "a");
}
scope_depth_++;
}
void CloseFile() {
if (!ShouldRedirect()) {
return;
}
if (--scope_depth_ == 0) {
fclose(file_);
file_ = NULL;
}
}
FILE* file() const { return file_; }
private:
static bool ShouldRedirect() {
return FLAG_redirect_code_traces;
}
EmbeddedVector<char, 128> filename_;
FILE* file_;
int scope_depth_;
};
} } // namespace v8::internal
#endif // V8_ISOLATE_H_