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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 <sstream>
#include <string>
#include <utility> // For move
#include <vector>
#include "include/v8-callbacks.h"
#include "include/v8-cppgc.h"
#include "include/v8-date.h"
#include "include/v8-extension.h"
#include "include/v8-fast-api-calls.h"
#include "include/v8-function.h"
#include "include/v8-json.h"
#include "include/v8-locker.h"
#include "include/v8-primitive-object.h"
#include "include/v8-profiler.h"
#include "include/v8-unwinder-state.h"
#include "include/v8-util.h"
#include "include/v8-wasm.h"
#include "src/api/api-inl.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/baseline/baseline-batch-compiler.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/codegen/script-details.h"
#include "src/common/assert-scope.h"
#include "src/common/external-pointer.h"
#include "src/common/globals.h"
#include "src/compiler-dispatcher/lazy-compile-dispatcher.h"
#include "src/date/date.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/handles/persistent-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/init/vm-cage.h"
#include "src/json/json-parser.h"
#include "src/json/json-stringifier.h"
#include "src/logging/counters-scopes.h"
#include "src/logging/metrics.h"
#include "src/logging/runtime-call-stats-scope.h"
#include "src/logging/tracing-flags.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/hash-table-inl.h"
#include "src/objects/heap-object.h"
#include "src/objects/js-array-buffer-inl.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/js-collection-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/shared-function-info.h"
#include "src/objects/slots.h"
#include "src/objects/smi.h"
#include "src/objects/stack-frame-info-inl.h"
#include "src/objects/synthetic-module-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/embedded/embedded-data.h"
#include "src/snapshot/snapshot.h"
#include "src/snapshot/startup-serializer.h" // For SerializedHandleChecker.
#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/utils/detachable-vector.h"
#include "src/utils/version.h"
#if V8_ENABLE_WEBASSEMBLY
#include "src/trap-handler/trap-handler.h"
#include "src/wasm/streaming-decoder.h"
#include "src/wasm/value-type.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-js.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-result.h"
#include "src/wasm/wasm-serialization.h"
#endif // V8_ENABLE_WEBASSEMBLY
#if V8_OS_LINUX || V8_OS_MACOSX || V8_OS_FREEBSD
#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 <windows.h>
// This has to come after windows.h.
#include <versionhelpers.h>
#include "include/v8-wasm-trap-handler-win.h"
#include "src/trap-handler/handler-inside-win.h"
#if defined(V8_OS_WIN64)
#include "src/base/platform/wrappers.h"
#include "src/diagnostics/unwinding-info-win64.h"
#endif // V8_OS_WIN64
#if defined(V8_ENABLE_SYSTEM_INSTRUMENTATION)
#include "src/diagnostics/system-jit-win.h"
#endif
#endif // V8_OS_WIN
// Has to be the last include (doesn't have include guards):
#include "src/api/api-macros.h"
#define TRACE_BS(...) \
do { \
if (i::FLAG_trace_backing_store) PrintF(__VA_ARGS__); \
} while (false)
namespace v8 {
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);
ScriptOriginOptions options(script->origin_options());
bool is_wasm = false;
#if V8_ENABLE_WEBASSEMBLY
is_wasm = script->type() == i::Script::TYPE_WASM;
#endif // V8_ENABLE_WEBASSEMBLY
v8::ScriptOrigin origin(
reinterpret_cast<v8::Isolate*>(isolate), Utils::ToLocal(scriptName),
script->line_offset(), script->column_offset(),
options.IsSharedCrossOrigin(), script->id(),
Utils::ToLocal(source_map_url), options.IsOpaque(), is_wasm,
options.IsModule(), Utils::PrimitiveArrayToLocal(host_defined_options));
return origin;
}
ScriptOrigin::ScriptOrigin(
Local<Value> resource_name, Local<Integer> line_offset,
Local<Integer> column_offset, Local<Boolean> is_shared_cross_origin,
Local<Integer> script_id, Local<Value> source_map_url,
Local<Boolean> is_opaque, Local<Boolean> is_wasm, Local<Boolean> is_module,
Local<PrimitiveArray> host_defined_options)
: ScriptOrigin(
Isolate::GetCurrent(), resource_name,
line_offset.IsEmpty() ? 0 : static_cast<int>(line_offset->Value()),
column_offset.IsEmpty() ? 0
: static_cast<int>(column_offset->Value()),
!is_shared_cross_origin.IsEmpty() && is_shared_cross_origin->IsTrue(),
static_cast<int>(script_id.IsEmpty() ? -1 : script_id->Value()),
source_map_url, !is_opaque.IsEmpty() && is_opaque->IsTrue(),
!is_wasm.IsEmpty() && is_wasm->IsTrue(),
!is_module.IsEmpty() && is_module->IsTrue(), host_defined_options) {}
ScriptOrigin::ScriptOrigin(Local<Value> resource_name, int line_offset,
int column_offset, bool is_shared_cross_origin,
int script_id, Local<Value> source_map_url,
bool is_opaque, bool is_wasm, bool is_module,
Local<PrimitiveArray> host_defined_options)
: isolate_(Isolate::GetCurrent()),
resource_name_(resource_name),
resource_line_offset_(line_offset),
resource_column_offset_(column_offset),
options_(is_shared_cross_origin, is_opaque, is_wasm, is_module),
script_id_(script_id),
source_map_url_(source_map_url),
host_defined_options_(host_defined_options) {}
Local<Integer> ScriptOrigin::ResourceLineOffset() const {
return v8::Integer::New(isolate_, resource_line_offset_);
}
Local<Integer> ScriptOrigin::ResourceColumnOffset() const {
return v8::Integer::New(isolate_, resource_column_offset_);
}
Local<Integer> ScriptOrigin::ScriptID() const {
return v8::Integer::New(isolate_, script_id_);
}
// --- 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);
if (!FLAG_correctness_fuzzer_suppressions) {
char* first_newline = strchr(last_few_messages, '\n');
if (first_newline == nullptr || first_newline[1] == '\0')
first_newline = last_few_messages;
base::OS::PrintError("\n<--- Last few GCs --->\n%s\n", first_newline);
base::OS::PrintError("\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::TryGetCurrent();
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);
#ifdef V8_FUZZILLI
exit(0);
#else
base::OS::Abort();
#endif // V8_FUZZILLI
} 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();
}
void V8::SetSnapshotDataBlob(StartupData* snapshot_blob) {
i::V8::SetSnapshotBlob(snapshot_blob);
}
namespace {
#ifdef V8_VIRTUAL_MEMORY_CAGE
// ArrayBufferAllocator to use when the virtual memory cage is enabled, in which
// case all ArrayBuffer backing stores need to be allocated inside the data
// cage. Note, the current implementation is extremely inefficient as it uses
// the BoundedPageAllocator. In the future, we'll need a proper allocator
// implementation.
class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
public:
ArrayBufferAllocator() { CHECK(page_allocator_); }
void* Allocate(size_t length) override {
return page_allocator_->AllocatePages(nullptr, RoundUp(length, page_size_),
page_size_,
PageAllocator::kReadWrite);
}
void* AllocateUninitialized(size_t length) override {
return Allocate(length);
}
void Free(void* data, size_t length) override {
page_allocator_->FreePages(data, RoundUp(length, page_size_));
}
private:
PageAllocator* page_allocator_ = internal::GetArrayBufferPageAllocator();
const size_t page_size_ = page_allocator_->AllocatePageSize();
};
#else
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 = base::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 = base::Malloc(length);
#endif
return data;
}
void Free(void* data, size_t) override { base::Free(data); }
void* Reallocate(void* data, size_t old_length, size_t new_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* new_data = __linux_realloc(data, new_length);
#else
void* new_data = base::Realloc(data, new_length);
#endif
if (new_length > old_length) {
memset(reinterpret_cast<uint8_t*>(new_data) + old_length, 0,
new_length - old_length);
}
return new_data;
}
};
#endif // V8_VIRTUAL_MEMORY_CAGE
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);
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;
// Disable batch compilation during snapshot creation.
internal_isolate->baseline_batch_compiler()->set_enabled(false);
}
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::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());
const int num_additional_contexts = static_cast<int>(data->contexts_.Size());
const int num_contexts = num_additional_contexts + 1; // The default context.
// Create and store lists of embedder-provided data needed during
// serialization.
{
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();
}
i::Snapshot::ClearReconstructableDataForSerialization(
isolate, function_code_handling == FunctionCodeHandling::kClear);
i::DisallowGarbageCollection no_gc_from_here_on;
// Create a vector with all contexts and clear associated Persistent fields.
// Note these contexts may be dead after calling Clear(), but will not be
// collected until serialization completes and the DisallowGarbageCollection
// scope above goes out of scope.
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());
// Create a vector with all embedder fields serializers.
std::vector<SerializeInternalFieldsCallback> embedder_fields_serializers;
embedder_fields_serializers.reserve(num_contexts);
embedder_fields_serializers.push_back(
data->default_embedder_fields_serializer_);
for (int i = 0; i < num_additional_contexts; i++) {
embedder_fields_serializers.push_back(
data->embedder_fields_serializers_[i]);
}
data->created_ = true;
return i::Snapshot::Create(isolate, &contexts, embedder_fields_serializers,
no_gc_from_here_on);
}
bool StartupData::CanBeRehashed() const {
DCHECK(i::Snapshot::VerifyChecksum(this));
return i::Snapshot::ExtractRehashability(this);
}
bool StartupData::IsValid() const { return i::Snapshot::VersionIsValid(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) {
using HelpOptions = i::FlagList::HelpOptions;
i::FlagList::SetFlagsFromCommandLine(argc, argv, remove_flags,
HelpOptions(HelpOptions::kDontExit));
}
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(
std::max(young_generation, i::Heap::MinYoungGenerationSize()));
set_max_old_generation_size_in_bytes(
std::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::kPlatformRequiresCodeRange) {
set_code_range_size_in_bytes(
std::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);
set_max_young_generation_size_in_bytes(young_generation);
set_max_old_generation_size_in_bytes(old_generation);
if (virtual_memory_limit > 0 && i::kPlatformRequiresCodeRange) {
set_code_range_size_in_bytes(
std::min(i::kMaximalCodeRangeSize,
static_cast<size_t>(virtual_memory_limit / 8)));
}
}
namespace api_internal {
i::Address* GlobalizeTracedReference(i::Isolate* isolate, i::Address* obj,
internal::Address* slot,
bool has_destructor) {
LOG_API(isolate, TracedGlobal, New);
#ifdef DEBUG
Utils::ApiCheck((slot != nullptr), "v8::GlobalizeTracedReference",
"the address slot must be not null");
#endif
i::Handle<i::Object> result =
isolate->global_handles()->CreateTraced(*obj, slot, has_destructor);
#ifdef VERIFY_HEAP
if (i::FLAG_verify_heap) {
i::Object(*obj).ObjectVerify(isolate);
}
#endif // VERIFY_HEAP
return result.location();
}
i::Address* GlobalizeReference(i::Isolate* isolate, i::Address* obj) {
LOG_API(isolate, Persistent, New);
i::Handle<i::Object> result = isolate->global_handles()->Create(*obj);
#ifdef VERIFY_HEAP
if (i::FLAG_verify_heap) {
i::Object(*obj).ObjectVerify(isolate);
}
#endif // VERIFY_HEAP
return result.location();
}
i::Address* CopyGlobalReference(i::Address* from) {
i::Handle<i::Object> result = i::GlobalHandles::CopyGlobal(from);
return result.location();
}
void MoveGlobalReference(internal::Address** from, internal::Address** to) {
i::GlobalHandles::MoveGlobal(from, to);
}
void MakeWeak(i::Address* location, void* parameter,
WeakCallbackInfo<void>::Callback weak_callback,
WeakCallbackType type) {
i::GlobalHandles::MakeWeak(location, parameter, weak_callback, type);
}
void MakeWeak(i::Address** location_addr) {
i::GlobalHandles::MakeWeak(location_addr);
}
void* ClearWeak(i::Address* location) {
return i::GlobalHandles::ClearWeakness(location);
}
void AnnotateStrongRetainer(i::Address* location, const char* label) {
i::GlobalHandles::AnnotateStrongRetainer(location, label);
}
void DisposeGlobal(i::Address* location) {
i::GlobalHandles::Destroy(location);
}
Value* Eternalize(Isolate* v8_isolate, Value* value) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
i::Object object = *Utils::OpenHandle(value);
int index = -1;
isolate->eternal_handles()->Create(isolate, object, &index);
return reinterpret_cast<Value*>(
isolate->eternal_handles()->Get(index).location());
}
void MoveTracedGlobalReference(internal::Address** from,
internal::Address** to) {
i::GlobalHandles::MoveTracedGlobal(from, to);
}
void CopyTracedGlobalReference(const internal::Address* const* from,
internal::Address** to) {
i::GlobalHandles::CopyTracedGlobal(from, to);
}
void DisposeTracedGlobal(internal::Address* location) {
i::GlobalHandles::DestroyTraced(location);
}
void SetFinalizationCallbackTraced(internal::Address* location, void* parameter,
WeakCallbackInfo<void>::Callback callback) {
i::GlobalHandles::SetFinalizationCallbackForTraced(location, parameter,
callback);
}
void FromJustIsNothing() {
Utils::ApiCheck(false, "v8::FromJust", "Maybe value is Nothing.");
}
void ToLocalEmpty() {
Utils::ApiCheck(false, "v8::ToLocalChecked", "Empty MaybeLocal.");
}
void InternalFieldOutOfBounds(int index) {
Utils::ApiCheck(0 <= index && index < kInternalFieldsInWeakCallback,
"WeakCallbackInfo::GetInternalField",
"Internal field out of bounds.");
}
} // namespace api_internal
// --- H a n d l e s ---
HandleScope::HandleScope(Isolate* isolate) { Initialize(isolate); }
void HandleScope::Initialize(Isolate* isolate) {
i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
// We do not want to check the correct usage of the Locker class all over the
// place, so we do it only here: Without a HandleScope, an embedder can do
// almost nothing, so it is enough to check in this central place.
// We make an exception if the serializer is enabled, which means that the
// Isolate is exclusively used to create a snapshot.
Utils::ApiCheck(
!v8::Locker::IsActive() ||
internal_isolate->thread_manager()->IsLockedByCurrentThread() ||
internal_isolate->serializer_enabled(),
"HandleScope::HandleScope",
"Entering the V8 API without proper locking in place");
i::HandleScopeData* current = internal_isolate->handle_scope_data();
isolate_ = internal_isolate;
prev_next_ = current->next;
prev_limit_ = current->limit;
current->level++;
}
HandleScope::~HandleScope() {
i::HandleScope::CloseScope(isolate_, prev_next_, prev_limit_);
}
void* HandleScope::operator new(size_t) { base::OS::Abort(); }
void* HandleScope::operator new[](size_t) { base::OS::Abort(); }
void HandleScope::operator delete(void*, size_t) { base::OS::Abort(); }
void HandleScope::operator delete[](void*, size_t) { base::OS::Abort(); }
int HandleScope::NumberOfHandles(Isolate* isolate) {
return i::HandleScope::NumberOfHandles(
reinterpret_cast<i::Isolate*>(isolate));
}
i::Address* HandleScope::CreateHandle(i::Isolate* isolate, i::Address value) {
return i::HandleScope::CreateHandle(isolate, value);
}
EscapableHandleScope::EscapableHandleScope(Isolate* v8_isolate) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
escape_slot_ =
CreateHandle(isolate, i::ReadOnlyRoots(isolate).the_hole_value().ptr());
Initialize(v8_isolate);
}
i::Address* EscapableHandleScope::Escape(i::Address* escape_value) {
i::Heap* heap = reinterpret_cast<i::Isolate*>(GetIsolate())->heap();
Utils::ApiCheck(i::Object(*escape_slot_).IsTheHole(heap->isolate()),
"EscapableHandleScope::Escape", "Escape value set twice");
if (escape_value == nullptr) {
*escape_slot_ = i::ReadOnlyRoots(heap).undefined_value().ptr();
return nullptr;
}
*escape_slot_ = *escape_value;
return escape_slot_;
}
void* EscapableHandleScope::operator new(size_t) { base::OS::Abort(); }
void* EscapableHandleScope::operator new[](size_t) { base::OS::Abort(); }