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api.cc
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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/api.h"
#include <string.h> // For memcpy, strlen.
#include <cmath> // For isnan.
#include <limits>
#include <vector>
#include "include/v8-profiler.h"
#include "include/v8-testing.h"
#include "include/v8-util.h"
#include "src/accessors.h"
#include "src/api-natives.h"
#include "src/assert-scope.h"
#include "src/base/functional.h"
#include "src/base/logging.h"
#include "src/base/platform/platform.h"
#include "src/base/platform/time.h"
#include "src/base/safe_conversions.h"
#include "src/base/utils/random-number-generator.h"
#include "src/bootstrapper.h"
#include "src/builtins/builtins-utils.h"
#include "src/char-predicates-inl.h"
#include "src/code-stubs.h"
#include "src/compiler-dispatcher/compiler-dispatcher.h"
#include "src/compiler.h"
#include "src/contexts.h"
#include "src/conversions-inl.h"
#include "src/counters.h"
#include "src/debug/debug-coverage.h"
#include "src/debug/debug-evaluate.h"
#include "src/debug/debug-type-profile.h"
#include "src/debug/debug.h"
#include "src/deoptimizer.h"
#include "src/detachable-vector.h"
#include "src/execution.h"
#include "src/frames-inl.h"
#include "src/gdb-jit.h"
#include "src/global-handles.h"
#include "src/globals.h"
#include "src/icu_util.h"
#include "src/isolate-inl.h"
#include "src/json-parser.h"
#include "src/json-stringifier.h"
#include "src/messages.h"
#include "src/objects-inl.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/ordered-hash-table-inl.h"
#include "src/objects/templates.h"
#include "src/parsing/parser.h"
#include "src/parsing/scanner-character-streams.h"
#include "src/pending-compilation-error-handler.h"
#include "src/profiler/cpu-profiler.h"
#include "src/profiler/heap-profiler.h"
#include "src/profiler/heap-snapshot-generator-inl.h"
#include "src/profiler/profile-generator-inl.h"
#include "src/profiler/tick-sample.h"
#include "src/property-descriptor.h"
#include "src/property-details.h"
#include "src/property.h"
#include "src/prototype.h"
#include "src/runtime-profiler.h"
#include "src/runtime/runtime.h"
#include "src/simulator.h"
#include "src/snapshot/builtin-serializer.h"
#include "src/snapshot/code-serializer.h"
#include "src/snapshot/natives.h"
#include "src/snapshot/snapshot.h"
#include "src/startup-data-util.h"
#include "src/string-hasher.h"
#include "src/tracing/trace-event.h"
#include "src/trap-handler/trap-handler.h"
#include "src/unicode-cache-inl.h"
#include "src/unicode-inl.h"
#include "src/v8.h"
#include "src/v8threads.h"
#include "src/value-serializer.h"
#include "src/version.h"
#include "src/vm-state-inl.h"
#include "src/wasm/streaming-decoder.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-result.h"
#include "src/wasm/wasm-serialization.h"
namespace v8 {
/*
* Most API methods should use one of the three macros:
*
* ENTER_V8, ENTER_V8_NO_SCRIPT, ENTER_V8_NO_SCRIPT_NO_EXCEPTION.
*
* The latter two assume that no script is executed, and no exceptions are
* scheduled in addition (respectively). Creating a pending exception and
* removing it before returning is ok.
*
* Exceptions should be handled either by invoking one of the
* RETURN_ON_FAILED_EXECUTION* macros.
*
* Don't use macros with DO_NOT_USE in their name.
*
* TODO(jochen): Document debugger specific macros.
* TODO(jochen): Document LOG_API and other RuntimeCallStats macros.
* TODO(jochen): All API methods should invoke one of the ENTER_V8* macros.
* TODO(jochen): Remove calls form API methods to DO_NOT_USE macros.
*/
#define LOG_API(isolate, class_name, function_name) \
i::RuntimeCallTimerScope _runtime_timer( \
isolate, i::RuntimeCallCounterId::kAPI_##class_name##_##function_name); \
LOG(isolate, ApiEntryCall("v8::" #class_name "::" #function_name))
#define ENTER_V8_DO_NOT_USE(isolate) i::VMState<v8::OTHER> __state__((isolate))
#define ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, \
function_name, bailout_value, \
HandleScopeClass, do_callback) \
if (IsExecutionTerminatingCheck(isolate)) { \
return bailout_value; \
} \
HandleScopeClass handle_scope(isolate); \
CallDepthScope<do_callback> call_depth_scope(isolate, context); \
LOG_API(isolate, class_name, function_name); \
i::VMState<v8::OTHER> __state__((isolate)); \
bool has_pending_exception = false
#define PREPARE_FOR_DEBUG_INTERFACE_EXECUTION_WITH_ISOLATE(isolate, T) \
if (IsExecutionTerminatingCheck(isolate)) { \
return MaybeLocal<T>(); \
} \
InternalEscapableScope handle_scope(isolate); \
CallDepthScope<false> call_depth_scope(isolate, v8::Local<v8::Context>()); \
i::VMState<v8::OTHER> __state__((isolate)); \
bool has_pending_exception = false
#define PREPARE_FOR_EXECUTION_WITH_CONTEXT(context, class_name, function_name, \
bailout_value, HandleScopeClass, \
do_callback) \
auto isolate = context.IsEmpty() \
? i::Isolate::Current() \
: reinterpret_cast<i::Isolate*>(context->GetIsolate()); \
ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, function_name, \
bailout_value, HandleScopeClass, do_callback);
#define PREPARE_FOR_EXECUTION(context, class_name, function_name, T) \
PREPARE_FOR_EXECUTION_WITH_CONTEXT(context, class_name, function_name, \
MaybeLocal<T>(), InternalEscapableScope, \
false)
#define ENTER_V8(isolate, context, class_name, function_name, bailout_value, \
HandleScopeClass) \
ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, function_name, \
bailout_value, HandleScopeClass, true)
#ifdef DEBUG
#define ENTER_V8_NO_SCRIPT(isolate, context, class_name, function_name, \
bailout_value, HandleScopeClass) \
ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, function_name, \
bailout_value, HandleScopeClass, false); \
i::DisallowJavascriptExecutionDebugOnly __no_script__((isolate))
#define ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate) \
i::VMState<v8::OTHER> __state__((isolate)); \
i::DisallowJavascriptExecutionDebugOnly __no_script__((isolate)); \
i::DisallowExceptions __no_exceptions__((isolate))
#define ENTER_V8_FOR_NEW_CONTEXT(isolate) \
i::VMState<v8::OTHER> __state__((isolate)); \
i::DisallowExceptions __no_exceptions__((isolate))
#else
#define ENTER_V8_NO_SCRIPT(isolate, context, class_name, function_name, \
bailout_value, HandleScopeClass) \
ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, function_name, \
bailout_value, HandleScopeClass, false)
#define ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate) \
i::VMState<v8::OTHER> __state__((isolate));
#define ENTER_V8_FOR_NEW_CONTEXT(isolate) \
i::VMState<v8::OTHER> __state__((isolate));
#endif // DEBUG
#define EXCEPTION_BAILOUT_CHECK_SCOPED_DO_NOT_USE(isolate, value) \
do { \
if (has_pending_exception) { \
call_depth_scope.Escape(); \
return value; \
} \
} while (false)
#define RETURN_ON_FAILED_EXECUTION(T) \
EXCEPTION_BAILOUT_CHECK_SCOPED_DO_NOT_USE(isolate, MaybeLocal<T>())
#define RETURN_ON_FAILED_EXECUTION_PRIMITIVE(T) \
EXCEPTION_BAILOUT_CHECK_SCOPED_DO_NOT_USE(isolate, Nothing<T>())
#define RETURN_TO_LOCAL_UNCHECKED(maybe_local, T) \
return maybe_local.FromMaybe(Local<T>());
#define RETURN_ESCAPED(value) return handle_scope.Escape(value);
namespace {
Local<Context> ContextFromHeapObject(i::Handle<i::Object> obj) {
return reinterpret_cast<v8::Isolate*>(i::HeapObject::cast(*obj)->GetIsolate())
->GetCurrentContext();
}
class InternalEscapableScope : public v8::EscapableHandleScope {
public:
explicit inline InternalEscapableScope(i::Isolate* isolate)
: v8::EscapableHandleScope(reinterpret_cast<v8::Isolate*>(isolate)) {}
};
// TODO(jochen): This should be #ifdef DEBUG
#ifdef V8_CHECK_MICROTASKS_SCOPES_CONSISTENCY
void CheckMicrotasksScopesConsistency(i::Isolate* isolate) {
auto handle_scope_implementer = isolate->handle_scope_implementer();
if (handle_scope_implementer->microtasks_policy() ==
v8::MicrotasksPolicy::kScoped) {
DCHECK(handle_scope_implementer->GetMicrotasksScopeDepth() ||
!handle_scope_implementer->DebugMicrotasksScopeDepthIsZero());
}
}
#endif
template <bool do_callback>
class CallDepthScope {
public:
explicit CallDepthScope(i::Isolate* isolate, Local<Context> context)
: isolate_(isolate),
context_(context),
escaped_(false),
safe_for_termination_(isolate->next_v8_call_is_safe_for_termination()),
interrupts_scope_(isolate_, i::StackGuard::TERMINATE_EXECUTION,
isolate_->only_terminate_in_safe_scope()
? (safe_for_termination_
? i::InterruptsScope::kRunInterrupts
: i::InterruptsScope::kPostponeInterrupts)
: i::InterruptsScope::kNoop) {
// TODO(dcarney): remove this when blink stops crashing.
DCHECK(!isolate_->external_caught_exception());
isolate_->handle_scope_implementer()->IncrementCallDepth();
isolate_->set_next_v8_call_is_safe_for_termination(false);
if (!context.IsEmpty()) {
i::Handle<i::Context> env = Utils::OpenHandle(*context);
i::HandleScopeImplementer* impl = isolate->handle_scope_implementer();
if (isolate->context() != nullptr &&
isolate->context()->native_context() == env->native_context()) {
context_ = Local<Context>();
} else {
impl->SaveContext(isolate->context());
isolate->set_context(*env);
}
}
if (do_callback) isolate_->FireBeforeCallEnteredCallback();
}
~CallDepthScope() {
if (!context_.IsEmpty()) {
i::HandleScopeImplementer* impl = isolate_->handle_scope_implementer();
isolate_->set_context(impl->RestoreContext());
}
if (!escaped_) isolate_->handle_scope_implementer()->DecrementCallDepth();
if (do_callback) isolate_->FireCallCompletedCallback();
// TODO(jochen): This should be #ifdef DEBUG
#ifdef V8_CHECK_MICROTASKS_SCOPES_CONSISTENCY
if (do_callback) CheckMicrotasksScopesConsistency(isolate_);
#endif
isolate_->set_next_v8_call_is_safe_for_termination(safe_for_termination_);
}
void Escape() {
DCHECK(!escaped_);
escaped_ = true;
auto handle_scope_implementer = isolate_->handle_scope_implementer();
handle_scope_implementer->DecrementCallDepth();
bool call_depth_is_zero = handle_scope_implementer->CallDepthIsZero();
isolate_->OptionalRescheduleException(call_depth_is_zero);
}
private:
i::Isolate* const isolate_;
Local<Context> context_;
bool escaped_;
bool do_callback_;
bool safe_for_termination_;
i::InterruptsScope interrupts_scope_;
};
} // namespace
static ScriptOrigin GetScriptOriginForScript(i::Isolate* isolate,
i::Handle<i::Script> script) {
i::Handle<i::Object> scriptName(script->GetNameOrSourceURL(), isolate);
i::Handle<i::Object> source_map_url(script->source_mapping_url(), isolate);
i::Handle<i::FixedArray> host_defined_options(script->host_defined_options(),
isolate);
v8::Isolate* v8_isolate =
reinterpret_cast<v8::Isolate*>(script->GetIsolate());
ScriptOriginOptions options(script->origin_options());
v8::ScriptOrigin origin(
Utils::ToLocal(scriptName),
v8::Integer::New(v8_isolate, script->line_offset()),
v8::Integer::New(v8_isolate, script->column_offset()),
v8::Boolean::New(v8_isolate, options.IsSharedCrossOrigin()),
v8::Integer::New(v8_isolate, script->id()),
Utils::ToLocal(source_map_url),
v8::Boolean::New(v8_isolate, options.IsOpaque()),
v8::Boolean::New(v8_isolate, script->type() == i::Script::TYPE_WASM),
v8::Boolean::New(v8_isolate, options.IsModule()),
Utils::ToLocal(host_defined_options));
return origin;
}
// --- E x c e p t i o n B e h a v i o r ---
void i::FatalProcessOutOfMemory(i::Isolate* isolate, const char* location) {
i::V8::FatalProcessOutOfMemory(isolate, location, false);
}
// When V8 cannot allocate memory FatalProcessOutOfMemory is called. The default
// OOM error handler is called and execution is stopped.
void i::V8::FatalProcessOutOfMemory(i::Isolate* isolate, const char* location,
bool is_heap_oom) {
char last_few_messages[Heap::kTraceRingBufferSize + 1];
char js_stacktrace[Heap::kStacktraceBufferSize + 1];
i::HeapStats heap_stats;
if (isolate == nullptr) {
isolate = Isolate::Current();
}
if (isolate == nullptr) {
// On a background thread -> we cannot retrieve memory information from the
// Isolate. Write easy-to-recognize values on the stack.
memset(last_few_messages, 0x0BADC0DE, Heap::kTraceRingBufferSize + 1);
memset(js_stacktrace, 0x0BADC0DE, Heap::kStacktraceBufferSize + 1);
memset(&heap_stats, 0xBADC0DE, sizeof(heap_stats));
// Note that the embedder's oom handler won't be called in this case. We
// just crash.
FATAL(
"API fatal error handler returned after process out of memory on the "
"background thread");
UNREACHABLE();
}
memset(last_few_messages, 0, Heap::kTraceRingBufferSize + 1);
memset(js_stacktrace, 0, Heap::kStacktraceBufferSize + 1);
intptr_t start_marker;
heap_stats.start_marker = &start_marker;
size_t ro_space_size;
heap_stats.ro_space_size = &ro_space_size;
size_t ro_space_capacity;
heap_stats.ro_space_capacity = &ro_space_capacity;
size_t new_space_size;
heap_stats.new_space_size = &new_space_size;
size_t new_space_capacity;
heap_stats.new_space_capacity = &new_space_capacity;
size_t old_space_size;
heap_stats.old_space_size = &old_space_size;
size_t old_space_capacity;
heap_stats.old_space_capacity = &old_space_capacity;
size_t code_space_size;
heap_stats.code_space_size = &code_space_size;
size_t code_space_capacity;
heap_stats.code_space_capacity = &code_space_capacity;
size_t map_space_size;
heap_stats.map_space_size = &map_space_size;
size_t map_space_capacity;
heap_stats.map_space_capacity = &map_space_capacity;
size_t lo_space_size;
heap_stats.lo_space_size = &lo_space_size;
size_t global_handle_count;
heap_stats.global_handle_count = &global_handle_count;
size_t weak_global_handle_count;
heap_stats.weak_global_handle_count = &weak_global_handle_count;
size_t pending_global_handle_count;
heap_stats.pending_global_handle_count = &pending_global_handle_count;
size_t near_death_global_handle_count;
heap_stats.near_death_global_handle_count = &near_death_global_handle_count;
size_t free_global_handle_count;
heap_stats.free_global_handle_count = &free_global_handle_count;
size_t memory_allocator_size;
heap_stats.memory_allocator_size = &memory_allocator_size;
size_t memory_allocator_capacity;
heap_stats.memory_allocator_capacity = &memory_allocator_capacity;
size_t malloced_memory;
heap_stats.malloced_memory = &malloced_memory;
size_t malloced_peak_memory;
heap_stats.malloced_peak_memory = &malloced_peak_memory;
size_t objects_per_type[LAST_TYPE + 1] = {0};
heap_stats.objects_per_type = objects_per_type;
size_t size_per_type[LAST_TYPE + 1] = {0};
heap_stats.size_per_type = size_per_type;
int os_error;
heap_stats.os_error = &os_error;
heap_stats.last_few_messages = last_few_messages;
heap_stats.js_stacktrace = js_stacktrace;
intptr_t end_marker;
heap_stats.end_marker = &end_marker;
if (isolate->heap()->HasBeenSetUp()) {
// BUG(1718): Don't use the take_snapshot since we don't support
// HeapIterator here without doing a special GC.
isolate->heap()->RecordStats(&heap_stats, false);
char* first_newline = strchr(last_few_messages, '\n');
if (first_newline == nullptr || first_newline[1] == '\0')
first_newline = last_few_messages;
PrintF("\n<--- Last few GCs --->\n%s\n", first_newline);
PrintF("\n<--- JS stacktrace --->\n%s\n", js_stacktrace);
}
Utils::ReportOOMFailure(isolate, location, is_heap_oom);
// If the fatal error handler returns, we stop execution.
FATAL("API fatal error handler returned after process out of memory");
}
void Utils::ReportApiFailure(const char* location, const char* message) {
i::Isolate* isolate = i::Isolate::Current();
FatalErrorCallback callback = nullptr;
if (isolate != nullptr) {
callback = isolate->exception_behavior();
}
if (callback == nullptr) {
base::OS::PrintError("\n#\n# Fatal error in %s\n# %s\n#\n\n", location,
message);
base::OS::Abort();
} else {
callback(location, message);
}
isolate->SignalFatalError();
}
void Utils::ReportOOMFailure(i::Isolate* isolate, const char* location,
bool is_heap_oom) {
OOMErrorCallback oom_callback = isolate->oom_behavior();
if (oom_callback == nullptr) {
// TODO(wfh): Remove this fallback once Blink is setting OOM handler. See
// crbug.com/614440.
FatalErrorCallback fatal_callback = isolate->exception_behavior();
if (fatal_callback == nullptr) {
base::OS::PrintError("\n#\n# Fatal %s OOM in %s\n#\n\n",
is_heap_oom ? "javascript" : "process", location);
base::OS::Abort();
} else {
fatal_callback(location,
is_heap_oom
? "Allocation failed - JavaScript heap out of memory"
: "Allocation failed - process out of memory");
}
} else {
oom_callback(location, is_heap_oom);
}
isolate->SignalFatalError();
}
static inline bool IsExecutionTerminatingCheck(i::Isolate* isolate) {
if (isolate->has_scheduled_exception()) {
return isolate->scheduled_exception() ==
isolate->heap()->termination_exception();
}
return false;
}
void V8::SetNativesDataBlob(StartupData* natives_blob) {
i::V8::SetNativesBlob(natives_blob);
}
void V8::SetSnapshotDataBlob(StartupData* snapshot_blob) {
i::V8::SetSnapshotBlob(snapshot_blob);
}
namespace {
class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
public:
void* Allocate(size_t length) override {
#if V8_OS_AIX && _LINUX_SOURCE_COMPAT
// Work around for GCC bug on AIX
// See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
void* data = __linux_calloc(length, 1);
#else
void* data = calloc(length, 1);
#endif
return data;
}
void* AllocateUninitialized(size_t length) override {
#if V8_OS_AIX && _LINUX_SOURCE_COMPAT
// Work around for GCC bug on AIX
// See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
void* data = __linux_malloc(length);
#else
void* data = malloc(length);
#endif
return data;
}
void Free(void* data, size_t) override { free(data); }
};
bool RunExtraCode(Isolate* isolate, Local<Context> context,
const char* utf8_source, const char* name) {
base::ElapsedTimer timer;
timer.Start();
Context::Scope context_scope(context);
TryCatch try_catch(isolate);
Local<String> source_string;
if (!String::NewFromUtf8(isolate, utf8_source, NewStringType::kNormal)
.ToLocal(&source_string)) {
return false;
}
Local<String> resource_name =
String::NewFromUtf8(isolate, name, NewStringType::kNormal)
.ToLocalChecked();
ScriptOrigin origin(resource_name);
ScriptCompiler::Source source(source_string, origin);
Local<Script> script;
if (!ScriptCompiler::Compile(context, &source).ToLocal(&script)) return false;
if (script->Run(context).IsEmpty()) return false;
if (i::FLAG_profile_deserialization) {
i::PrintF("Executing custom snapshot script %s took %0.3f ms\n", name,
timer.Elapsed().InMillisecondsF());
}
timer.Stop();
CHECK(!try_catch.HasCaught());
return true;
}
struct SnapshotCreatorData {
explicit SnapshotCreatorData(Isolate* isolate)
: isolate_(isolate),
default_context_(),
contexts_(isolate),
created_(false) {}
static SnapshotCreatorData* cast(void* data) {
return reinterpret_cast<SnapshotCreatorData*>(data);
}
ArrayBufferAllocator allocator_;
Isolate* isolate_;
Persistent<Context> default_context_;
SerializeInternalFieldsCallback default_embedder_fields_serializer_;
PersistentValueVector<Context> contexts_;
std::vector<SerializeInternalFieldsCallback> embedder_fields_serializers_;
bool created_;
};
} // namespace
SnapshotCreator::SnapshotCreator(Isolate* isolate,
const intptr_t* external_references,
StartupData* existing_snapshot) {
SnapshotCreatorData* data = new SnapshotCreatorData(isolate);
data->isolate_ = isolate;
i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
internal_isolate->set_array_buffer_allocator(&data->allocator_);
internal_isolate->set_api_external_references(external_references);
internal_isolate->enable_serializer();
isolate->Enter();
const StartupData* blob = existing_snapshot
? existing_snapshot
: i::Snapshot::DefaultSnapshotBlob();
if (blob && blob->raw_size > 0) {
internal_isolate->set_snapshot_blob(blob);
i::Snapshot::Initialize(internal_isolate);
} else {
internal_isolate->Init(nullptr);
}
data_ = data;
}
SnapshotCreator::SnapshotCreator(const intptr_t* external_references,
StartupData* existing_snapshot)
: SnapshotCreator(reinterpret_cast<Isolate*>(new i::Isolate()),
external_references, existing_snapshot) {}
SnapshotCreator::~SnapshotCreator() {
SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
DCHECK(data->created_);
Isolate* isolate = data->isolate_;
isolate->Exit();
isolate->Dispose();
delete data;
}
Isolate* SnapshotCreator::GetIsolate() {
return SnapshotCreatorData::cast(data_)->isolate_;
}
void SnapshotCreator::SetDefaultContext(
Local<Context> context, SerializeInternalFieldsCallback callback) {
DCHECK(!context.IsEmpty());
SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
DCHECK(!data->created_);
DCHECK(data->default_context_.IsEmpty());
Isolate* isolate = data->isolate_;
CHECK_EQ(isolate, context->GetIsolate());
data->default_context_.Reset(isolate, context);
data->default_embedder_fields_serializer_ = callback;
}
size_t SnapshotCreator::AddContext(Local<Context> context,
SerializeInternalFieldsCallback callback) {
DCHECK(!context.IsEmpty());
SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
DCHECK(!data->created_);
Isolate* isolate = data->isolate_;
CHECK_EQ(isolate, context->GetIsolate());
size_t index = data->contexts_.Size();
data->contexts_.Append(context);
data->embedder_fields_serializers_.push_back(callback);
return index;
}
size_t SnapshotCreator::AddTemplate(Local<Template> template_obj) {
return AddData(template_obj);
}
size_t SnapshotCreator::AddData(i::Object* object) {
DCHECK_NOT_NULL(object);
SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
DCHECK(!data->created_);
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(data->isolate_);
i::HandleScope scope(isolate);
i::Handle<i::Object> obj(object, isolate);
i::Handle<i::ArrayList> list;
if (!isolate->heap()->serialized_objects()->IsArrayList()) {
list = i::ArrayList::New(isolate, 1);
} else {
list = i::Handle<i::ArrayList>(
i::ArrayList::cast(isolate->heap()->serialized_objects()));
}
size_t index = static_cast<size_t>(list->Length());
list = i::ArrayList::Add(list, obj);
isolate->heap()->SetSerializedObjects(*list);
return index;
}
size_t SnapshotCreator::AddData(Local<Context> context, i::Object* object) {
DCHECK_NOT_NULL(object);
DCHECK(!SnapshotCreatorData::cast(data_)->created_);
i::Handle<i::Context> ctx = Utils::OpenHandle(*context);
i::Isolate* isolate = ctx->GetIsolate();
i::HandleScope scope(isolate);
i::Handle<i::Object> obj(object, isolate);
i::Handle<i::ArrayList> list;
if (!ctx->serialized_objects()->IsArrayList()) {
list = i::ArrayList::New(isolate, 1);
} else {
list =
i::Handle<i::ArrayList>(i::ArrayList::cast(ctx->serialized_objects()));
}
size_t index = static_cast<size_t>(list->Length());
list = i::ArrayList::Add(list, obj);
ctx->set_serialized_objects(*list);
return index;
}
namespace {
void ConvertSerializedObjectsToFixedArray(Local<Context> context) {
i::Handle<i::Context> ctx = Utils::OpenHandle(*context);
i::Isolate* isolate = ctx->GetIsolate();
if (!ctx->serialized_objects()->IsArrayList()) {
ctx->set_serialized_objects(isolate->heap()->empty_fixed_array());
} else {
i::Handle<i::ArrayList> list(i::ArrayList::cast(ctx->serialized_objects()));
i::Handle<i::FixedArray> elements = i::ArrayList::Elements(list);
ctx->set_serialized_objects(*elements);
}
}
void ConvertSerializedObjectsToFixedArray(i::Isolate* isolate) {
if (!isolate->heap()->serialized_objects()->IsArrayList()) {
isolate->heap()->SetSerializedObjects(isolate->heap()->empty_fixed_array());
} else {
i::Handle<i::ArrayList> list(
i::ArrayList::cast(isolate->heap()->serialized_objects()));
i::Handle<i::FixedArray> elements = i::ArrayList::Elements(list);
isolate->heap()->SetSerializedObjects(*elements);
}
}
} // anonymous namespace
StartupData SnapshotCreator::CreateBlob(
SnapshotCreator::FunctionCodeHandling function_code_handling) {
SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(data->isolate_);
DCHECK(!data->created_);
DCHECK(!data->default_context_.IsEmpty());
int num_additional_contexts = static_cast<int>(data->contexts_.Size());
{
i::HandleScope scope(isolate);
// Convert list of context-independent data to FixedArray.
ConvertSerializedObjectsToFixedArray(isolate);
// Convert lists of context-dependent data to FixedArray.
ConvertSerializedObjectsToFixedArray(
data->default_context_.Get(data->isolate_));
for (int i = 0; i < num_additional_contexts; i++) {
ConvertSerializedObjectsToFixedArray(data->contexts_.Get(i));
}
// We need to store the global proxy size upfront in case we need the
// bootstrapper to create a global proxy before we deserialize the context.
i::Handle<i::FixedArray> global_proxy_sizes =
isolate->factory()->NewFixedArray(num_additional_contexts, i::TENURED);
for (int i = 0; i < num_additional_contexts; i++) {
i::Handle<i::Context> context =
v8::Utils::OpenHandle(*data->contexts_.Get(i));
global_proxy_sizes->set(i,
i::Smi::FromInt(context->global_proxy()->Size()));
}
isolate->heap()->SetSerializedGlobalProxySizes(*global_proxy_sizes);
}
// We might rehash strings and re-sort descriptors. Clear the lookup cache.
isolate->descriptor_lookup_cache()->Clear();
// If we don't do this then we end up with a stray root pointing at the
// context even after we have disposed of the context.
isolate->heap()->CollectAllAvailableGarbage(
i::GarbageCollectionReason::kSnapshotCreator);
isolate->heap()->CompactFixedArraysOfWeakCells();
isolate->heap()->read_only_space()->ClearStringPaddingIfNeeded();
i::DisallowHeapAllocation no_gc_from_here_on;
int num_contexts = num_additional_contexts + 1;
std::vector<i::Context*> contexts;
contexts.reserve(num_contexts);
{
i::HandleScope scope(isolate);
contexts.push_back(
*v8::Utils::OpenHandle(*data->default_context_.Get(data->isolate_)));
data->default_context_.Reset();
for (int i = 0; i < num_additional_contexts; i++) {
i::Handle<i::Context> context =
v8::Utils::OpenHandle(*data->contexts_.Get(i));
contexts.push_back(*context);
}
data->contexts_.Clear();
}
// Check that values referenced by global/eternal handles are accounted for.
i::SerializedHandleChecker handle_checker(isolate, &contexts);
CHECK(handle_checker.CheckGlobalAndEternalHandles());
i::HeapIterator heap_iterator(isolate->heap());
while (i::HeapObject* current_obj = heap_iterator.next()) {
if (current_obj->IsJSFunction()) {
i::JSFunction* fun = i::JSFunction::cast(current_obj);
// Complete in-object slack tracking for all functions.
fun->CompleteInobjectSlackTrackingIfActive();
// Also, clear out feedback vectors.
fun->feedback_cell()->set_value(isolate->heap()->undefined_value());
}
// Clear out re-compilable data from all shared function infos. Any
// JSFunctions using these SFIs will have their code pointers reset by the
// partial serializer.
if (current_obj->IsSharedFunctionInfo() &&
function_code_handling == FunctionCodeHandling::kClear) {
i::SharedFunctionInfo* shared = i::SharedFunctionInfo::cast(current_obj);
if (shared->CanFlushCompiled()) {
shared->FlushCompiled();
}
DCHECK(shared->HasWasmExportedFunctionData() || shared->HasBuiltinId() ||
shared->IsApiFunction());
}
}
i::StartupSerializer startup_serializer(isolate);
startup_serializer.SerializeStrongReferences();
// Serialize each context with a new partial serializer.
std::vector<i::SnapshotData*> context_snapshots;
context_snapshots.reserve(num_contexts);
// TODO(6593): generalize rehashing, and remove this flag.
bool can_be_rehashed = true;
for (int i = 0; i < num_contexts; i++) {
bool is_default_context = i == 0;
i::PartialSerializer partial_serializer(
isolate, &startup_serializer,
is_default_context ? data->default_embedder_fields_serializer_
: data->embedder_fields_serializers_[i - 1]);
partial_serializer.Serialize(&contexts[i], !is_default_context);
can_be_rehashed = can_be_rehashed && partial_serializer.can_be_rehashed();
context_snapshots.push_back(new i::SnapshotData(&partial_serializer));
}
// Builtin serialization places additional objects into the partial snapshot
// cache and thus needs to happen before SerializeWeakReferencesAndDeferred
// is called below.
i::BuiltinSerializer builtin_serializer(isolate, &startup_serializer);
builtin_serializer.SerializeBuiltinsAndHandlers();
startup_serializer.SerializeWeakReferencesAndDeferred();
can_be_rehashed = can_be_rehashed && startup_serializer.can_be_rehashed();
i::SnapshotData startup_snapshot(&startup_serializer);
i::BuiltinSnapshotData builtin_snapshot(&builtin_serializer);
StartupData result = i::Snapshot::CreateSnapshotBlob(
&startup_snapshot, &builtin_snapshot, context_snapshots, can_be_rehashed);
// Delete heap-allocated context snapshot instances.
for (const auto context_snapshot : context_snapshots) {
delete context_snapshot;
}
data->created_ = true;
return result;
}
StartupData V8::CreateSnapshotDataBlob(const char* embedded_source) {
// Create a new isolate and a new context from scratch, optionally run
// a script to embed, and serialize to create a snapshot blob.
StartupData result = {nullptr, 0};
base::ElapsedTimer timer;
timer.Start();
{
SnapshotCreator snapshot_creator;
Isolate* isolate = snapshot_creator.GetIsolate();
{
HandleScope scope(isolate);
Local<Context> context = Context::New(isolate);
if (embedded_source != nullptr &&
!RunExtraCode(isolate, context, embedded_source, "<embedded>")) {
return result;
}
snapshot_creator.SetDefaultContext(context);
}
result = snapshot_creator.CreateBlob(
SnapshotCreator::FunctionCodeHandling::kClear);
}
if (i::FLAG_profile_deserialization) {
i::PrintF("Creating snapshot took %0.3f ms\n",
timer.Elapsed().InMillisecondsF());
}
timer.Stop();
return result;
}
StartupData V8::WarmUpSnapshotDataBlob(StartupData cold_snapshot_blob,
const char* warmup_source) {
CHECK(cold_snapshot_blob.raw_size > 0 && cold_snapshot_blob.data != nullptr);
CHECK_NOT_NULL(warmup_source);
// Use following steps to create a warmed up snapshot blob from a cold one:
// - Create a new isolate from the cold snapshot.
// - Create a new context to run the warmup script. This will trigger
// compilation of executed functions.
// - Create a new context. This context will be unpolluted.
// - Serialize the isolate and the second context into a new snapshot blob.
StartupData result = {nullptr, 0};
base::ElapsedTimer timer;
timer.Start();
{
SnapshotCreator snapshot_creator(nullptr, &cold_snapshot_blob);
Isolate* isolate = snapshot_creator.GetIsolate();
{
HandleScope scope(isolate);
Local<Context> context = Context::New(isolate);
if (!RunExtraCode(isolate, context, warmup_source, "<warm-up>")) {
return result;
}
}
{
HandleScope handle_scope(isolate);
isolate->ContextDisposedNotification(false);
Local<Context> context = Context::New(isolate);
snapshot_creator.SetDefaultContext(context);
}
result = snapshot_creator.CreateBlob(
SnapshotCreator::FunctionCodeHandling::kKeep);
}
if (i::FLAG_profile_deserialization) {
i::PrintF("Warming up snapshot took %0.3f ms\n",
timer.Elapsed().InMillisecondsF());
}
timer.Stop();
return result;
}
void V8::SetDcheckErrorHandler(DcheckErrorCallback that) {
v8::base::SetDcheckFunction(that);
}
void V8::SetFlagsFromString(const char* str, int length) {
i::FlagList::SetFlagsFromString(str, length);
i::FlagList::EnforceFlagImplications();
}
void V8::SetFlagsFromCommandLine(int* argc, char** argv, bool remove_flags) {
i::FlagList::SetFlagsFromCommandLine(argc, argv, remove_flags);
}
RegisteredExtension* RegisteredExtension::first_extension_ = nullptr;
RegisteredExtension::RegisteredExtension(Extension* extension)
: extension_(extension) { }
void RegisteredExtension::Register(RegisteredExtension* that) {
that->next_ = first_extension_;
first_extension_ = that;
}
void RegisteredExtension::UnregisterAll() {
RegisteredExtension* re = first_extension_;
while (re != nullptr) {
RegisteredExtension* next = re->next();
delete re;
re = next;
}
first_extension_ = nullptr;
}
void RegisterExtension(Extension* that) {
RegisteredExtension* extension = new RegisteredExtension(that);
RegisteredExtension::Register(extension);
}
Extension::Extension(const char* name,
const char* source,
int dep_count,
const char** deps,
int source_length)
: name_(name),
source_length_(source_length >= 0 ?
source_length :
(source ? static_cast<int>(strlen(source)) : 0)),
source_(source, source_length_),
dep_count_(dep_count),
deps_(deps),
auto_enable_(false) {
CHECK(source != nullptr || source_length_ == 0);
}
ResourceConstraints::ResourceConstraints()
: max_semi_space_size_in_kb_(0),
max_old_space_size_(0),
stack_limit_(nullptr),
code_range_size_(0),
max_zone_pool_size_(0) {}
void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
uint64_t virtual_memory_limit) {
set_max_semi_space_size_in_kb(
i::Heap::ComputeMaxSemiSpaceSize(physical_memory));
set_max_old_space_size(i::Heap::ComputeMaxOldGenerationSize(physical_memory));
set_max_zone_pool_size(i::AccountingAllocator::kMaxPoolSize);
if (virtual_memory_limit > 0 && i::kRequiresCodeRange) {
// Reserve no more than 1/8 of the memory for the code range, but at most
// kMaximalCodeRangeSize.
set_code_range_size(
i::Min(i::kMaximalCodeRangeSize / i::MB,
static_cast<size_t>((virtual_memory_limit >> 3) / i::MB)));
}
}
void SetResourceConstraints(i::Isolate* isolate,
const ResourceConstraints& constraints) {
size_t semi_space_size = constraints.max_semi_space_size_in_kb();
size_t old_space_size = constraints.max_old_space_size();
size_t code_range_size = constraints.code_range_size();
size_t max_pool_size = constraints.max_zone_pool_size();
if (semi_space_size != 0 || old_space_size != 0 || code_range_size != 0) {
isolate->heap()->ConfigureHeap(semi_space_size, old_space_size,
code_range_size);
}
isolate->allocator()->ConfigureSegmentPool(max_pool_size);
if (constraints.stack_limit() != nullptr) {
uintptr_t limit = reinterpret_cast<uintptr_t>(constraints.stack_limit());
isolate->stack_guard()->SetStackLimit(limit);
}
}