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api.cc
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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/api.h"
#include <algorithm> // For min
#include <cmath> // For isnan.
#include <limits>
#include <string>
#include <utility> // For move
#include <vector>
#include "src/api/api-inl.h"
#include "include/v8-profiler.h"
#include "include/v8-testing.h"
#include "include/v8-util.h"
#include "src/api/api-natives.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/builtins/accessors.h"
#include "src/builtins/builtins-utils.h"
#include "src/codegen/compiler.h"
#include "src/codegen/cpu-features.h"
#include "src/common/assert-scope.h"
#include "src/common/globals.h"
#include "src/compiler-dispatcher/compiler-dispatcher.h"
#include "src/date/date.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/debug/liveedit.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/diagnostics/gdb-jit.h"
#include "src/execution/execution.h"
#include "src/execution/frames-inl.h"
#include "src/execution/isolate-inl.h"
#include "src/execution/messages.h"
#include "src/execution/microtask-queue.h"
#include "src/execution/runtime-profiler.h"
#include "src/execution/simulator.h"
#include "src/execution/v8threads.h"
#include "src/execution/vm-state-inl.h"
#include "src/handles/global-handles.h"
#include "src/heap/embedder-tracing.h"
#include "src/heap/heap-inl.h"
#include "src/init/bootstrapper.h"
#include "src/init/icu_util.h"
#include "src/init/startup-data-util.h"
#include "src/init/v8.h"
#include "src/json/json-parser.h"
#include "src/json/json-stringifier.h"
#include "src/logging/counters.h"
#include "src/numbers/conversions-inl.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/contexts.h"
#include "src/objects/embedder-data-array-inl.h"
#include "src/objects/embedder-data-slot-inl.h"
#include "src/objects/frame-array-inl.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/heap-object.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/js-collection-inl.h"
#include "src/objects/js-generator-inl.h"
#include "src/objects/js-promise-inl.h"
#include "src/objects/js-regexp-inl.h"
#include "src/objects/js-weak-refs-inl.h"
#include "src/objects/module-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/oddball.h"
#include "src/objects/ordered-hash-table-inl.h"
#include "src/objects/property-descriptor.h"
#include "src/objects/property-details.h"
#include "src/objects/property.h"
#include "src/objects/prototype.h"
#include "src/objects/slots.h"
#include "src/objects/smi.h"
#include "src/objects/stack-frame-info-inl.h"
#include "src/objects/templates.h"
#include "src/objects/value-serializer.h"
#include "src/parsing/parse-info.h"
#include "src/parsing/parser.h"
#include "src/parsing/pending-compilation-error-handler.h"
#include "src/parsing/scanner-character-streams.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/regexp/regexp-utils.h"
#include "src/runtime/runtime.h"
#include "src/snapshot/code-serializer.h"
#include "src/snapshot/partial-serializer.h"
#include "src/snapshot/read-only-serializer.h"
#include "src/snapshot/snapshot.h"
#include "src/snapshot/startup-serializer.h"
#include "src/strings/char-predicates-inl.h"
#include "src/strings/string-hasher.h"
#include "src/strings/unicode-inl.h"
#include "src/tracing/trace-event.h"
#include "src/trap-handler/trap-handler.h"
#include "src/utils/detachable-vector.h"
#include "src/utils/version.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"
#if V8_OS_LINUX || V8_OS_MACOSX
#include <signal.h>
#include "include/v8-wasm-trap-handler-posix.h"
#include "src/trap-handler/handler-inside-posix.h"
#endif
#if V8_OS_WIN
#include <versionhelpers.h>
#include <windows.h>
#include "include/v8-wasm-trap-handler-win.h"
#include "src/trap-handler/handler-inside-win.h"
#if defined(V8_OS_WIN64)
#include "src/diagnostics/unwinding-info-win64.h"
#endif // V8_OS_WIN64
#endif // V8_OS_WIN
#define TRACE_BS(...) \
do { \
if (i::FLAG_trace_backing_store) PrintF(__VA_ARGS__); \
} while (false)
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_ESCAPED(value) return handle_scope.Escape(value);
namespace {
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::MicrotaskQueue* microtask_queue) {
if (microtask_queue &&
microtask_queue->microtasks_policy() == v8::MicrotasksPolicy::kScoped) {
DCHECK(microtask_queue->GetMicrotasksScopeDepth() ||
!microtask_queue->DebugMicrotasksScopeDepthIsZero());
}
}
#endif
template <bool do_callback>
class CallDepthScope {
public:
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) {
isolate_->thread_local_top()->IncrementCallDepth(this);
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().is_null() &&
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() {
i::MicrotaskQueue* microtask_queue = isolate_->default_microtask_queue();
if (!context_.IsEmpty()) {
i::HandleScopeImplementer* impl = isolate_->handle_scope_implementer();
isolate_->set_context(impl->RestoreContext());
i::Handle<i::Context> env = Utils::OpenHandle(*context_);
microtask_queue = env->native_context().microtask_queue();
}
if (!escaped_) isolate_->thread_local_top()->DecrementCallDepth(this);
if (do_callback) isolate_->FireCallCompletedCallback(microtask_queue);
// TODO(jochen): This should be #ifdef DEBUG
#ifdef V8_CHECK_MICROTASKS_SCOPES_CONSISTENCY
if (do_callback) CheckMicrotasksScopesConsistency(microtask_queue);
#endif
isolate_->set_next_v8_call_is_safe_for_termination(safe_for_termination_);
}
void Escape() {
DCHECK(!escaped_);
escaped_ = true;
auto thread_local_top = isolate_->thread_local_top();
thread_local_top->DecrementCallDepth(this);
bool clear_exception = thread_local_top->CallDepthIsZero() &&
thread_local_top->try_catch_handler_ == nullptr;
isolate_->OptionalRescheduleException(clear_exception);
}
private:
i::Isolate* const isolate_;
Local<Context> context_;
bool escaped_;
bool do_callback_;
bool safe_for_termination_;
i::InterruptsScope interrupts_scope_;
i::Address previous_stack_height_;
friend class i::ThreadLocalTop;
DISALLOW_NEW_AND_DELETE()
DISALLOW_COPY_AND_ASSIGN(CallDepthScope);
};
} // 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*>(isolate);
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::TryGetCurrent();
}
if (isolate == nullptr) {
// If the Isolate is not available for the current 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 is also not available and therefore
// won't be called in this case. We just crash.
FATAL("Fatal process out of memory: %s", location);
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 code_lo_space_size;
heap_stats.code_lo_space_size = &code_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
// HeapObjectIterator 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() ==
i::ReadOnlyRoots(isolate).termination_exception();
}
return false;
}
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); }
};
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->InitWithoutSnapshot();
}
data_ = data;
}
SnapshotCreator::SnapshotCreator(const intptr_t* external_references,
StartupData* existing_snapshot)
: SnapshotCreator(Isolate::Allocate(), 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::Address object) {
DCHECK_NE(object, i::kNullAddress);
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(i::Object(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()), isolate);
}
size_t index = static_cast<size_t>(list->Length());
list = i::ArrayList::Add(isolate, list, obj);
isolate->heap()->SetSerializedObjects(*list);
return index;
}
size_t SnapshotCreator::AddData(Local<Context> context, i::Address object) {
DCHECK_NE(object, i::kNullAddress);
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(i::Object(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()), isolate);
}
size_t index = static_cast<size_t>(list->Length());
list = i::ArrayList::Add(isolate, 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(i::ReadOnlyRoots(isolate).empty_fixed_array());
} else {
i::Handle<i::ArrayList> list(i::ArrayList::cast(ctx->serialized_objects()),
isolate);
i::Handle<i::FixedArray> elements = i::ArrayList::Elements(isolate, list);
ctx->set_serialized_objects(*elements);
}
}
void ConvertSerializedObjectsToFixedArray(i::Isolate* isolate) {
if (!isolate->heap()->serialized_objects().IsArrayList()) {
isolate->heap()->SetSerializedObjects(
i::ReadOnlyRoots(isolate).empty_fixed_array());
} else {
i::Handle<i::ArrayList> list(
i::ArrayList::cast(isolate->heap()->serialized_objects()), isolate);
i::Handle<i::FixedArray> elements = i::ArrayList::Elements(isolate, 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::AllocationType::kOld);
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);
{
i::HandleScope scope(isolate);
isolate->heap()->CompactWeakArrayLists(internal::AllocationType::kOld);
}
if (function_code_handling == FunctionCodeHandling::kClear) {
// 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.
//
// We have to iterate the heap and collect handles to each clearable SFI,
// before we disable allocation, since we have to allocate UncompiledDatas
// to be able to recompile them.
//
// Compiled irregexp code is also flushed by collecting and clearing any
// seen JSRegExp objects.
i::HandleScope scope(isolate);
std::vector<i::Handle<i::SharedFunctionInfo>> sfis_to_clear;
{ // Heap allocation is disallowed within this scope.
i::HeapObjectIterator heap_iterator(isolate->heap());
for (i::HeapObject current_obj = heap_iterator.Next();
!current_obj.is_null(); current_obj = heap_iterator.Next()) {
if (current_obj.IsSharedFunctionInfo()) {
i::SharedFunctionInfo shared =
i::SharedFunctionInfo::cast(current_obj);
if (shared.CanDiscardCompiled()) {
sfis_to_clear.emplace_back(shared, isolate);
}
} else if (current_obj.IsJSRegExp()) {
i::JSRegExp regexp = i::JSRegExp::cast(current_obj);
if (regexp.HasCompiledCode()) {
regexp.DiscardCompiledCodeForSerialization();
}
}
}
}
// Must happen after heap iteration since SFI::DiscardCompiled may allocate.
for (i::Handle<i::SharedFunctionInfo> shared : sfis_to_clear) {
i::SharedFunctionInfo::DiscardCompiled(isolate, shared);
}
}
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::HeapObjectIterator heap_iterator(isolate->heap());
for (i::HeapObject current_obj = heap_iterator.Next(); !current_obj.is_null();
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, or any optimized code.
// Note that checking for fun.IsOptimized() || fun.IsInterpreted() is not
// sufficient because the function can have a feedback vector even if it
// is not compiled (e.g. when the bytecode was flushed). On the other
// hand, only checking for the feedback vector is not sufficient because
// there can be multiple functions sharing the same feedback vector. So we
// need all these checks.
if (fun.IsOptimized() || fun.IsInterpreted() ||
!fun.raw_feedback_cell().value().IsUndefined()) {
fun.raw_feedback_cell().set_value(
i::ReadOnlyRoots(isolate).undefined_value());
fun.set_code(isolate->builtins()->builtin(i::Builtins::kCompileLazy));
}
if (function_code_handling == FunctionCodeHandling::kClear) {
DCHECK(fun.shared().HasWasmExportedFunctionData() ||
fun.shared().HasBuiltinId() || fun.shared().IsApiFunction() ||
fun.shared().HasUncompiledDataWithoutPreparseData());
}
}
}
i::ReadOnlySerializer read_only_serializer(isolate);
read_only_serializer.SerializeReadOnlyRoots();
i::StartupSerializer startup_serializer(isolate, &read_only_serializer);
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));
}
startup_serializer.SerializeWeakReferencesAndDeferred();
can_be_rehashed = can_be_rehashed && startup_serializer.can_be_rehashed();
read_only_serializer.FinalizeSerialization();
can_be_rehashed = can_be_rehashed && read_only_serializer.can_be_rehashed();
i::SnapshotData read_only_snapshot(&read_only_serializer);
i::SnapshotData startup_snapshot(&startup_serializer);
StartupData result =
i::Snapshot::CreateSnapshotBlob(&startup_snapshot, &read_only_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;
DCHECK(i::Snapshot::VerifyChecksum(&result));
return result;
}
bool StartupData::CanBeRehashed() const {
DCHECK(i::Snapshot::VerifyChecksum(this));
return i::Snapshot::ExtractRehashability(this);
}
void V8::SetDcheckErrorHandler(DcheckErrorCallback that) {
v8::base::SetDcheckFunction(that);
}
void V8::SetFlagsFromString(const char* str) {
SetFlagsFromString(str, strlen(str));
}
void V8::SetFlagsFromString(const char* str, size_t 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(std::unique_ptr<Extension> extension)
: extension_(std::move(extension)) {}
// static
void RegisteredExtension::Register(std::unique_ptr<Extension> extension) {
RegisteredExtension* new_extension =
new RegisteredExtension(std::move(extension));
new_extension->next_ = first_extension_;
first_extension_ = new_extension;
}
// static
void RegisteredExtension::UnregisterAll() {
RegisteredExtension* re = first_extension_;
while (re != nullptr) {
RegisteredExtension* next = re->next();
delete re;
re = next;
}
first_extension_ = nullptr;
}
namespace {
class ExtensionResource : public String::ExternalOneByteStringResource {
public:
ExtensionResource() : data_(nullptr), length_(0) {}
ExtensionResource(const char* data, size_t length)
: data_(data), length_(length) {}
const char* data() const override { return data_; }
size_t length() const override { return length_; }
void Dispose() override {}
private:
const char* data_;
size_t length_;
};
} // anonymous namespace
void RegisterExtension(std::unique_ptr<Extension> extension) {
RegisteredExtension::Register(std::move(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)),
dep_count_(dep_count),
deps_(deps),
auto_enable_(false) {
source_ = new ExtensionResource(source, source_length_);
CHECK(source != nullptr || source_length_ == 0);
}
void ResourceConstraints::ConfigureDefaultsFromHeapSize(
size_t initial_heap_size_in_bytes, size_t maximum_heap_size_in_bytes) {
CHECK_LE(initial_heap_size_in_bytes, maximum_heap_size_in_bytes);
if (maximum_heap_size_in_bytes == 0) {
return;
}
size_t young_generation, old_generation;
i::Heap::GenerationSizesFromHeapSize(maximum_heap_size_in_bytes,
&young_generation, &old_generation);
set_max_young_generation_size_in_bytes(
i::Max(young_generation, i::Heap::MinYoungGenerationSize()));
set_max_old_generation_size_in_bytes(
i::Max(old_generation, i::Heap::MinOldGenerationSize()));
if (initial_heap_size_in_bytes > 0) {
i::Heap::GenerationSizesFromHeapSize(initial_heap_size_in_bytes,
&young_generation, &old_generation);
// We do not set lower bounds for the initial sizes.
set_initial_young_generation_size_in_bytes(young_generation);
set_initial_old_generation_size_in_bytes(old_generation);
}
if (i::kRequiresCodeRange) {
set_code_range_size_in_bytes(
i::Min(i::kMaximalCodeRangeSize, maximum_heap_size_in_bytes));
}
}
void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
uint64_t virtual_memory_limit) {
size_t heap_size = i::Heap::HeapSizeFromPhysicalMemory(physical_memory);
size_t young_generation, old_generation;
i::Heap::GenerationSizesFromHeapSize(heap_size, &young_generation,
&old_generation);