blob: 54ee909512df2acbddf6d941af1edea89c16c53d [file] [log] [blame]
// Copyright 2014 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/runtime/runtime-utils.h"
#include <memory>
#include <sstream>
#include "src/api-inl.h"
#include "src/arguments-inl.h"
#include "src/assembler-inl.h"
#include "src/base/platform/mutex.h"
#include "src/compiler-dispatcher/optimizing-compile-dispatcher.h"
#include "src/compiler.h"
#include "src/counters.h"
#include "src/deoptimizer.h"
#include "src/frames-inl.h"
#include "src/heap/heap-inl.h" // For ToBoolean. TODO(jkummerow): Drop.
#include "src/heap/heap-write-barrier-inl.h"
#include "src/ic/stub-cache.h"
#include "src/isolate-inl.h"
#include "src/objects/heap-object-inl.h"
#include "src/objects/smi.h"
#include "src/ostreams.h"
#include "src/runtime-profiler.h"
#include "src/snapshot/natives.h"
#include "src/trap-handler/trap-handler.h"
#include "src/wasm/memory-tracing.h"
#include "src/wasm/module-compiler.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-serialization.h"
namespace v8 {
namespace internal {
namespace {
struct WasmCompileControls {
uint32_t MaxWasmBufferSize = std::numeric_limits<uint32_t>::max();
bool AllowAnySizeForAsync = true;
};
using WasmCompileControlsMap = std::map<v8::Isolate*, WasmCompileControls>;
// We need per-isolate controls, because we sometimes run tests in multiple
// isolates concurrently. Methods need to hold the accompanying mutex on access.
// To avoid upsetting the static initializer count, we lazy initialize this.
DEFINE_LAZY_LEAKY_OBJECT_GETTER(WasmCompileControlsMap,
GetPerIsolateWasmControls)
base::LazyMutex g_PerIsolateWasmControlsMutex = LAZY_MUTEX_INITIALIZER;
bool IsWasmCompileAllowed(v8::Isolate* isolate, v8::Local<v8::Value> value,
bool is_async) {
base::MutexGuard guard(g_PerIsolateWasmControlsMutex.Pointer());
DCHECK_GT(GetPerIsolateWasmControls()->count(isolate), 0);
const WasmCompileControls& ctrls = GetPerIsolateWasmControls()->at(isolate);
return (is_async && ctrls.AllowAnySizeForAsync) ||
(value->IsArrayBuffer() &&
v8::Local<v8::ArrayBuffer>::Cast(value)->ByteLength() <=
ctrls.MaxWasmBufferSize) ||
(value->IsArrayBufferView() &&
v8::Local<v8::ArrayBufferView>::Cast(value)->ByteLength() <=
ctrls.MaxWasmBufferSize);
}
// Use the compile controls for instantiation, too
bool IsWasmInstantiateAllowed(v8::Isolate* isolate,
v8::Local<v8::Value> module_or_bytes,
bool is_async) {
base::MutexGuard guard(g_PerIsolateWasmControlsMutex.Pointer());
DCHECK_GT(GetPerIsolateWasmControls()->count(isolate), 0);
const WasmCompileControls& ctrls = GetPerIsolateWasmControls()->at(isolate);
if (is_async && ctrls.AllowAnySizeForAsync) return true;
if (!module_or_bytes->IsWebAssemblyCompiledModule()) {
return IsWasmCompileAllowed(isolate, module_or_bytes, is_async);
}
v8::Local<v8::WasmModuleObject> module =
v8::Local<v8::WasmModuleObject>::Cast(module_or_bytes);
return static_cast<uint32_t>(
module->GetCompiledModule().GetWireBytesRef().size()) <=
ctrls.MaxWasmBufferSize;
}
v8::Local<v8::Value> NewRangeException(v8::Isolate* isolate,
const char* message) {
return v8::Exception::RangeError(
v8::String::NewFromOneByte(isolate,
reinterpret_cast<const uint8_t*>(message),
v8::NewStringType::kNormal)
.ToLocalChecked());
}
void ThrowRangeException(v8::Isolate* isolate, const char* message) {
isolate->ThrowException(NewRangeException(isolate, message));
}
bool WasmModuleOverride(const v8::FunctionCallbackInfo<v8::Value>& args) {
if (IsWasmCompileAllowed(args.GetIsolate(), args[0], false)) return false;
ThrowRangeException(args.GetIsolate(), "Sync compile not allowed");
return true;
}
bool WasmInstanceOverride(const v8::FunctionCallbackInfo<v8::Value>& args) {
if (IsWasmInstantiateAllowed(args.GetIsolate(), args[0], false)) return false;
ThrowRangeException(args.GetIsolate(), "Sync instantiate not allowed");
return true;
}
} // namespace
RUNTIME_FUNCTION(Runtime_ClearMegamorphicStubCache) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
isolate->load_stub_cache()->Clear();
isolate->store_stub_cache()->Clear();
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_ConstructDouble) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_NUMBER_CHECKED(uint32_t, hi, Uint32, args[0]);
CONVERT_NUMBER_CHECKED(uint32_t, lo, Uint32, args[1]);
uint64_t result = (static_cast<uint64_t>(hi) << 32) | lo;
return *isolate->factory()->NewNumber(uint64_to_double(result));
}
RUNTIME_FUNCTION(Runtime_ConstructConsString) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(String, left, 0);
CONVERT_ARG_HANDLE_CHECKED(String, right, 1);
CHECK(left->IsOneByteRepresentation());
CHECK(right->IsOneByteRepresentation());
const bool kIsOneByte = true;
const int length = left->length() + right->length();
return *isolate->factory()->NewConsString(left, right, length, kIsOneByte);
}
RUNTIME_FUNCTION(Runtime_ConstructSlicedString) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(String, string, 0);
CONVERT_ARG_HANDLE_CHECKED(Smi, index, 1);
CHECK(string->IsOneByteRepresentation());
CHECK_LT(index->value(), string->length());
Handle<String> sliced_string = isolate->factory()->NewSubString(
string, index->value(), string->length());
CHECK(sliced_string->IsSlicedString());
return *sliced_string;
}
RUNTIME_FUNCTION(Runtime_DeoptimizeFunction) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
// This function is used by fuzzers to get coverage in compiler.
// Ignore calls on non-function objects to avoid runtime errors.
CONVERT_ARG_HANDLE_CHECKED(Object, function_object, 0);
if (!function_object->IsJSFunction()) {
return ReadOnlyRoots(isolate).undefined_value();
}
Handle<JSFunction> function = Handle<JSFunction>::cast(function_object);
// If the function is not optimized, just return.
if (!function->IsOptimized()) return ReadOnlyRoots(isolate).undefined_value();
Deoptimizer::DeoptimizeFunction(*function);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DeoptimizeNow) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
Handle<JSFunction> function;
// Find the JavaScript function on the top of the stack.
JavaScriptFrameIterator it(isolate);
if (!it.done()) function = handle(it.frame()->function(), isolate);
if (function.is_null()) return ReadOnlyRoots(isolate).undefined_value();
// If the function is not optimized, just return.
if (!function->IsOptimized()) return ReadOnlyRoots(isolate).undefined_value();
Deoptimizer::DeoptimizeFunction(*function);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_RunningInSimulator) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
#if defined(USE_SIMULATOR)
return ReadOnlyRoots(isolate).true_value();
#else
return ReadOnlyRoots(isolate).false_value();
#endif
}
RUNTIME_FUNCTION(Runtime_ICsAreEnabled) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
return isolate->heap()->ToBoolean(FLAG_use_ic);
}
RUNTIME_FUNCTION(Runtime_IsConcurrentRecompilationSupported) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
return isolate->heap()->ToBoolean(
isolate->concurrent_recompilation_enabled());
}
RUNTIME_FUNCTION(Runtime_OptimizeFunctionOnNextCall) {
HandleScope scope(isolate);
// This function is used by fuzzers, ignore calls with bogus arguments count.
if (args.length() != 1 && args.length() != 2) {
return ReadOnlyRoots(isolate).undefined_value();
}
// This function is used by fuzzers to get coverage for optimizations
// in compiler. Ignore calls on non-function objects to avoid runtime errors.
CONVERT_ARG_HANDLE_CHECKED(Object, function_object, 0);
if (!function_object->IsJSFunction()) {
return ReadOnlyRoots(isolate).undefined_value();
}
Handle<JSFunction> function = Handle<JSFunction>::cast(function_object);
// The following conditions were lifted (in part) from the DCHECK inside
// JSFunction::MarkForOptimization().
if (!function->shared()->allows_lazy_compilation()) {
return ReadOnlyRoots(isolate).undefined_value();
}
// If function isn't compiled, compile it now.
IsCompiledScope is_compiled_scope(function->shared()->is_compiled_scope());
if (!is_compiled_scope.is_compiled() &&
!Compiler::Compile(function, Compiler::CLEAR_EXCEPTION,
&is_compiled_scope)) {
return ReadOnlyRoots(isolate).undefined_value();
}
if (function->shared()->optimization_disabled() &&
function->shared()->disable_optimization_reason() ==
BailoutReason::kNeverOptimize) {
return ReadOnlyRoots(isolate).undefined_value();
}
// If the function is already optimized, just return.
if (function->IsOptimized() || function->shared()->HasAsmWasmData()) {
return ReadOnlyRoots(isolate).undefined_value();
}
// If the function has optimized code, ensure that we check for it and return.
if (function->HasOptimizedCode()) {
DCHECK(function->ChecksOptimizationMarker());
return ReadOnlyRoots(isolate).undefined_value();
}
ConcurrencyMode concurrency_mode = ConcurrencyMode::kNotConcurrent;
if (args.length() == 2) {
// Ignore invalid inputs produced by fuzzers.
CONVERT_ARG_HANDLE_CHECKED(Object, type, 1);
if (!type->IsString()) {
return ReadOnlyRoots(isolate).undefined_value();
}
if (Handle<String>::cast(type)->IsOneByteEqualTo(
StaticCharVector("concurrent")) &&
isolate->concurrent_recompilation_enabled()) {
concurrency_mode = ConcurrencyMode::kConcurrent;
}
}
if (FLAG_trace_opt) {
PrintF("[manually marking ");
function->ShortPrint();
PrintF(" for %s optimization]\n",
concurrency_mode == ConcurrencyMode::kConcurrent ? "concurrent"
: "non-concurrent");
}
// This function may not have been lazily compiled yet, even though its shared
// function has.
if (!function->is_compiled()) {
DCHECK(function->shared()->IsInterpreted());
function->set_code(*BUILTIN_CODE(isolate, InterpreterEntryTrampoline));
}
JSFunction::EnsureFeedbackVector(function);
function->MarkForOptimization(concurrency_mode);
return ReadOnlyRoots(isolate).undefined_value();
}
namespace {
bool EnsureFeedbackVector(Handle<JSFunction> function) {
// Check function allows lazy compilation.
if (!function->shared()->allows_lazy_compilation()) {
return false;
}
// If function isn't compiled, compile it now.
IsCompiledScope is_compiled_scope(function->shared()->is_compiled_scope());
if (!is_compiled_scope.is_compiled() &&
!Compiler::Compile(function, Compiler::CLEAR_EXCEPTION,
&is_compiled_scope)) {
return false;
}
// Ensure function has a feedback vector to hold type feedback for
// optimization.
JSFunction::EnsureFeedbackVector(function);
return true;
}
} // namespace
RUNTIME_FUNCTION(Runtime_EnsureFeedbackVectorForFunction) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
EnsureFeedbackVector(function);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_PrepareFunctionForOptimization) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
// Only one function should be prepared for optimization at a time
CHECK(isolate->heap()->pending_optimize_for_test_bytecode()->IsUndefined());
if (!EnsureFeedbackVector(function)) {
return ReadOnlyRoots(isolate).undefined_value();
}
// If optimization is disabled for the function, return without making it
// pending optimize for test.
if (function->shared()->optimization_disabled() &&
function->shared()->disable_optimization_reason() ==
BailoutReason::kNeverOptimize) {
return ReadOnlyRoots(isolate).undefined_value();
}
// If the function is already optimized, return without making it pending
// optimize for test.
if (function->IsOptimized() || function->shared()->HasAsmWasmData()) {
return ReadOnlyRoots(isolate).undefined_value();
}
// If the function has optimized code, ensure that we check for it and then
// return without making it pending optimize for test.
if (function->HasOptimizedCode()) {
DCHECK(function->ChecksOptimizationMarker());
return ReadOnlyRoots(isolate).undefined_value();
}
// Hold onto the bytecode array between marking and optimization to ensure
// it's not flushed.
isolate->heap()->SetPendingOptimizeForTestBytecode(
function->shared()->GetBytecodeArray());
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_OptimizeOsr) {
HandleScope scope(isolate);
DCHECK(args.length() == 0 || args.length() == 1);
Handle<JSFunction> function;
// The optional parameter determines the frame being targeted.
int stack_depth = args.length() == 1 ? args.smi_at(0) : 0;
// Find the JavaScript function on the top of the stack.
JavaScriptFrameIterator it(isolate);
while (!it.done() && stack_depth--) it.Advance();
if (!it.done()) function = handle(it.frame()->function(), isolate);
if (function.is_null()) return ReadOnlyRoots(isolate).undefined_value();
// If the function is already optimized, just return.
if (function->IsOptimized()) return ReadOnlyRoots(isolate).undefined_value();
if (function->shared()->optimization_disabled() &&
function->shared()->disable_optimization_reason() ==
BailoutReason::kNeverOptimize) {
return ReadOnlyRoots(isolate).undefined_value();
}
// Ensure that the function is marked for non-concurrent optimization, so that
// subsequent runs don't also optimize.
if (!function->HasOptimizedCode()) {
if (FLAG_trace_osr) {
PrintF("[OSR - OptimizeOsr marking ");
function->ShortPrint();
PrintF(" for non-concurrent optimization]\n");
}
function->MarkForOptimization(ConcurrencyMode::kNotConcurrent);
}
// Make the profiler arm all back edges in unoptimized code.
if (it.frame()->type() == StackFrame::INTERPRETED) {
isolate->runtime_profiler()->AttemptOnStackReplacement(
InterpretedFrame::cast(it.frame()),
AbstractCode::kMaxLoopNestingMarker);
}
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_NeverOptimizeFunction) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
// This function is used by fuzzers to get coverage for optimizations
// in compiler. Ignore calls on non-function objects to avoid runtime errors.
CONVERT_ARG_HANDLE_CHECKED(Object, function_object, 0);
if (!function_object->IsJSFunction()) {
return ReadOnlyRoots(isolate).undefined_value();
}
Handle<JSFunction> function = Handle<JSFunction>::cast(function_object);
function->shared()->DisableOptimization(BailoutReason::kNeverOptimize);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_GetOptimizationStatus) {
HandleScope scope(isolate);
DCHECK(args.length() == 1 || args.length() == 2);
int status = 0;
if (FLAG_lite_mode || FLAG_jitless) {
// Both jitless and lite modes cannot optimize. Unit tests should handle
// these the same way. In the future, the two flags may become synonyms.
status |= static_cast<int>(OptimizationStatus::kLiteMode);
}
if (!isolate->use_optimizer()) {
status |= static_cast<int>(OptimizationStatus::kNeverOptimize);
}
if (FLAG_always_opt || FLAG_prepare_always_opt) {
status |= static_cast<int>(OptimizationStatus::kAlwaysOptimize);
}
if (FLAG_deopt_every_n_times) {
status |= static_cast<int>(OptimizationStatus::kMaybeDeopted);
}
// This function is used by fuzzers to get coverage for optimizations
// in compiler. Ignore calls on non-function objects to avoid runtime errors.
CONVERT_ARG_HANDLE_CHECKED(Object, function_object, 0);
if (!function_object->IsJSFunction()) {
return Smi::FromInt(status);
}
Handle<JSFunction> function = Handle<JSFunction>::cast(function_object);
status |= static_cast<int>(OptimizationStatus::kIsFunction);
bool sync_with_compiler_thread = true;
if (args.length() == 2) {
CONVERT_ARG_HANDLE_CHECKED(Object, sync_object, 1);
if (!sync_object->IsString())
return ReadOnlyRoots(isolate).undefined_value();
Handle<String> sync = Handle<String>::cast(sync_object);
if (sync->IsOneByteEqualTo(StaticCharVector("no sync"))) {
sync_with_compiler_thread = false;
}
}
if (isolate->concurrent_recompilation_enabled() &&
sync_with_compiler_thread) {
while (function->IsInOptimizationQueue()) {
isolate->optimizing_compile_dispatcher()->InstallOptimizedFunctions();
base::OS::Sleep(base::TimeDelta::FromMilliseconds(50));
}
}
if (function->IsMarkedForOptimization()) {
status |= static_cast<int>(OptimizationStatus::kMarkedForOptimization);
} else if (function->IsInOptimizationQueue()) {
status |=
static_cast<int>(OptimizationStatus::kMarkedForConcurrentOptimization);
} else if (function->IsInOptimizationQueue()) {
status |= static_cast<int>(OptimizationStatus::kOptimizingConcurrently);
}
if (function->IsOptimized()) {
status |= static_cast<int>(OptimizationStatus::kOptimized);
if (function->code()->is_turbofanned()) {
status |= static_cast<int>(OptimizationStatus::kTurboFanned);
}
}
if (function->IsInterpreted()) {
status |= static_cast<int>(OptimizationStatus::kInterpreted);
}
// Additionally, detect activations of this frame on the stack, and report the
// status of the topmost frame.
JavaScriptFrame* frame = nullptr;
JavaScriptFrameIterator it(isolate);
while (!it.done()) {
if (it.frame()->function() == *function) {
frame = it.frame();
break;
}
it.Advance();
}
if (frame != nullptr) {
status |= static_cast<int>(OptimizationStatus::kIsExecuting);
if (frame->is_optimized()) {
status |=
static_cast<int>(OptimizationStatus::kTopmostFrameIsTurboFanned);
}
}
return Smi::FromInt(status);
}
RUNTIME_FUNCTION(Runtime_UnblockConcurrentRecompilation) {
DCHECK_EQ(0, args.length());
if (FLAG_block_concurrent_recompilation &&
isolate->concurrent_recompilation_enabled()) {
isolate->optimizing_compile_dispatcher()->Unblock();
}
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_GetDeoptCount) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
// Functions without a feedback vector have never deoptimized.
if (!function->has_feedback_vector()) return Smi::kZero;
return Smi::FromInt(function->feedback_vector()->deopt_count());
}
static void ReturnThis(const v8::FunctionCallbackInfo<v8::Value>& args) {
args.GetReturnValue().Set(args.This());
}
RUNTIME_FUNCTION(Runtime_GetUndetectable) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
Local<v8::ObjectTemplate> desc = v8::ObjectTemplate::New(v8_isolate);
desc->MarkAsUndetectable();
desc->SetCallAsFunctionHandler(ReturnThis);
Local<v8::Object> obj;
if (!desc->NewInstance(v8_isolate->GetCurrentContext()).ToLocal(&obj)) {
return Object();
}
return *Utils::OpenHandle(*obj);
}
static void call_as_function(const v8::FunctionCallbackInfo<v8::Value>& args) {
double v1 = args[0]
->NumberValue(v8::Isolate::GetCurrent()->GetCurrentContext())
.ToChecked();
double v2 = args[1]
->NumberValue(v8::Isolate::GetCurrent()->GetCurrentContext())
.ToChecked();
args.GetReturnValue().Set(
v8::Number::New(v8::Isolate::GetCurrent(), v1 - v2));
}
// Returns a callable object. The object returns the difference of its two
// parameters when it is called.
RUNTIME_FUNCTION(Runtime_GetCallable) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New(v8_isolate);
Local<ObjectTemplate> instance_template = t->InstanceTemplate();
instance_template->SetCallAsFunctionHandler(call_as_function);
v8_isolate->GetCurrentContext();
Local<v8::Object> instance =
t->GetFunction(v8_isolate->GetCurrentContext())
.ToLocalChecked()
->NewInstance(v8_isolate->GetCurrentContext())
.ToLocalChecked();
return *Utils::OpenHandle(*instance);
}
RUNTIME_FUNCTION(Runtime_ClearFunctionFeedback) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
function->ClearTypeFeedbackInfo();
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_SetWasmCompileControls) {
HandleScope scope(isolate);
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
CHECK_EQ(args.length(), 2);
CONVERT_ARG_HANDLE_CHECKED(Smi, block_size, 0);
CONVERT_BOOLEAN_ARG_CHECKED(allow_async, 1);
base::MutexGuard guard(g_PerIsolateWasmControlsMutex.Pointer());
WasmCompileControls& ctrl = (*GetPerIsolateWasmControls())[v8_isolate];
ctrl.AllowAnySizeForAsync = allow_async;
ctrl.MaxWasmBufferSize = static_cast<uint32_t>(block_size->value());
v8_isolate->SetWasmModuleCallback(WasmModuleOverride);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_SetWasmInstantiateControls) {
HandleScope scope(isolate);
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
CHECK_EQ(args.length(), 0);
v8_isolate->SetWasmInstanceCallback(WasmInstanceOverride);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_NotifyContextDisposed) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
isolate->heap()->NotifyContextDisposed(true);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_SetAllocationTimeout) {
SealHandleScope shs(isolate);
DCHECK(args.length() == 2 || args.length() == 3);
#ifdef V8_ENABLE_ALLOCATION_TIMEOUT
CONVERT_INT32_ARG_CHECKED(timeout, 1);
isolate->heap()->set_allocation_timeout(timeout);
#endif
#ifdef DEBUG
CONVERT_INT32_ARG_CHECKED(interval, 0);
FLAG_gc_interval = interval;
if (args.length() == 3) {
// Enable/disable inline allocation if requested.
CONVERT_BOOLEAN_ARG_CHECKED(inline_allocation, 2);
if (inline_allocation) {
isolate->heap()->EnableInlineAllocation();
} else {
isolate->heap()->DisableInlineAllocation();
}
}
#endif
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DebugPrint) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
MaybeObject maybe_object(*args.address_of_arg_at(0));
StdoutStream os;
if (maybe_object->IsCleared()) {
os << "[weak cleared]";
} else {
Object object = maybe_object.GetHeapObjectOrSmi();
bool weak = maybe_object.IsWeak();
#ifdef DEBUG
if (object->IsString() && !isolate->context().is_null()) {
DCHECK(!weak);
// If we have a string, assume it's a code "marker"
// and print some interesting cpu debugging info.
object->Print(os);
JavaScriptFrameIterator it(isolate);
JavaScriptFrame* frame = it.frame();
os << "fp = " << reinterpret_cast<void*>(frame->fp())
<< ", sp = " << reinterpret_cast<void*>(frame->sp())
<< ", caller_sp = " << reinterpret_cast<void*>(frame->caller_sp())
<< ": ";
} else {
os << "DebugPrint: ";
if (weak) {
os << "[weak] ";
}
object->Print(os);
}
if (object->IsHeapObject()) {
HeapObject::cast(object)->map()->Print(os);
}
#else
if (weak) {
os << "[weak] ";
}
// ShortPrint is available in release mode. Print is not.
os << Brief(object);
#endif
}
os << std::endl;
return args[0]; // return TOS
}
RUNTIME_FUNCTION(Runtime_PrintWithNameForAssert) {
SealHandleScope shs(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_CHECKED(String, name, 0);
PrintF(" * ");
StringCharacterStream stream(name);
while (stream.HasMore()) {
uint16_t character = stream.GetNext();
PrintF("%c", character);
}
PrintF(": ");
args[1]->ShortPrint();
PrintF("\n");
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DebugTrace) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
isolate->PrintStack(stdout);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DebugTrackRetainingPath) {
HandleScope scope(isolate);
DCHECK_LE(1, args.length());
DCHECK_GE(2, args.length());
if (!FLAG_track_retaining_path) {
PrintF("DebugTrackRetainingPath requires --track-retaining-path flag.\n");
} else {
CONVERT_ARG_HANDLE_CHECKED(HeapObject, object, 0);
RetainingPathOption option = RetainingPathOption::kDefault;
if (args.length() == 2) {
CONVERT_ARG_HANDLE_CHECKED(String, str, 1);
const char track_ephemeron_path[] = "track-ephemeron-path";
if (str->IsOneByteEqualTo(StaticCharVector(track_ephemeron_path))) {
option = RetainingPathOption::kTrackEphemeronPath;
} else if (str->length() != 0) {
PrintF("Unexpected second argument of DebugTrackRetainingPath.\n");
PrintF("Expected an empty string or '%s', got '%s'.\n",
track_ephemeron_path, str->ToCString().get());
}
}
isolate->heap()->AddRetainingPathTarget(object, option);
}
return ReadOnlyRoots(isolate).undefined_value();
}
// This will not allocate (flatten the string), but it may run
// very slowly for very deeply nested ConsStrings. For debugging use only.
RUNTIME_FUNCTION(Runtime_GlobalPrint) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(String, string, 0);
StringCharacterStream stream(string);
while (stream.HasMore()) {
uint16_t character = stream.GetNext();
PrintF("%c", character);
}
return string;
}
RUNTIME_FUNCTION(Runtime_SystemBreak) {
// The code below doesn't create handles, but when breaking here in GDB
// having a handle scope might be useful.
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
base::OS::DebugBreak();
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_SetForceSlowPath) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(Object, arg, 0);
if (arg->IsTrue(isolate)) {
isolate->set_force_slow_path(true);
} else {
DCHECK(arg->IsFalse(isolate));
isolate->set_force_slow_path(false);
}
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_Abort) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_SMI_ARG_CHECKED(message_id, 0);
const char* message = GetAbortReason(static_cast<AbortReason>(message_id));
base::OS::PrintError("abort: %s\n", message);
isolate->PrintStack(stderr);
base::OS::Abort();
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AbortJS) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(String, message, 0);
if (FLAG_disable_abortjs) {
base::OS::PrintError("[disabled] abort: %s\n", message->ToCString().get());
return Object();
}
base::OS::PrintError("abort: %s\n", message->ToCString().get());
isolate->PrintStack(stderr);
base::OS::Abort();
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_DisassembleFunction) {
HandleScope scope(isolate);
#ifdef DEBUG
DCHECK_EQ(1, args.length());
// Get the function and make sure it is compiled.
CONVERT_ARG_HANDLE_CHECKED(JSFunction, func, 0);
IsCompiledScope is_compiled_scope;
if (!func->is_compiled() &&
!Compiler::Compile(func, Compiler::KEEP_EXCEPTION, &is_compiled_scope)) {
return ReadOnlyRoots(isolate).exception();
}
StdoutStream os;
func->code()->Print(os);
os << std::endl;
#endif // DEBUG
return ReadOnlyRoots(isolate).undefined_value();
}
namespace {
int StackSize(Isolate* isolate) {
int n = 0;
for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) n++;
return n;
}
void PrintIndentation(Isolate* isolate) {
const int nmax = 80;
int n = StackSize(isolate);
if (n <= nmax) {
PrintF("%4d:%*s", n, n, "");
} else {
PrintF("%4d:%*s", n, nmax, "...");
}
}
} // namespace
RUNTIME_FUNCTION(Runtime_TraceEnter) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
PrintIndentation(isolate);
JavaScriptFrame::PrintTop(isolate, stdout, true, false);
PrintF(" {\n");
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_TraceExit) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(Object, obj, 0);
PrintIndentation(isolate);
PrintF("} -> ");
obj->ShortPrint();
PrintF("\n");
return obj; // return TOS
}
RUNTIME_FUNCTION(Runtime_HaveSameMap) {
SealHandleScope shs(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_CHECKED(JSObject, obj1, 0);
CONVERT_ARG_CHECKED(JSObject, obj2, 1);
return isolate->heap()->ToBoolean(obj1->map() == obj2->map());
}
RUNTIME_FUNCTION(Runtime_InNewSpace) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(Object, obj, 0);
return isolate->heap()->ToBoolean(ObjectInYoungGeneration(obj));
}
RUNTIME_FUNCTION(Runtime_IsAsmWasmCode) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(JSFunction, function, 0);
if (!function->shared()->HasAsmWasmData()) {
// Doesn't have wasm data.
return ReadOnlyRoots(isolate).false_value();
}
if (function->shared()->HasBuiltinId() &&
function->shared()->builtin_id() == Builtins::kInstantiateAsmJs) {
// Hasn't been compiled yet.
return ReadOnlyRoots(isolate).false_value();
}
return ReadOnlyRoots(isolate).true_value();
}
namespace {
bool DisallowCodegenFromStringsCallback(v8::Local<v8::Context> context,
v8::Local<v8::String> source) {
return false;
}
}
RUNTIME_FUNCTION(Runtime_DisallowCodegenFromStrings) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_BOOLEAN_ARG_CHECKED(flag, 0);
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
v8_isolate->SetAllowCodeGenerationFromStringsCallback(
flag ? DisallowCodegenFromStringsCallback : nullptr);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DisallowWasmCodegen) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_BOOLEAN_ARG_CHECKED(flag, 0);
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
v8_isolate->SetAllowWasmCodeGenerationCallback(
flag ? DisallowCodegenFromStringsCallback : nullptr);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_IsWasmCode) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(JSFunction, function, 0);
bool is_js_to_wasm = function->code()->kind() == Code::JS_TO_WASM_FUNCTION;
return isolate->heap()->ToBoolean(is_js_to_wasm);
}
RUNTIME_FUNCTION(Runtime_IsWasmTrapHandlerEnabled) {
DisallowHeapAllocation no_gc;
DCHECK_EQ(0, args.length());
return isolate->heap()->ToBoolean(trap_handler::IsTrapHandlerEnabled());
}
RUNTIME_FUNCTION(Runtime_IsThreadInWasm) {
DisallowHeapAllocation no_gc;
DCHECK_EQ(0, args.length());
return isolate->heap()->ToBoolean(trap_handler::IsThreadInWasm());
}
RUNTIME_FUNCTION(Runtime_GetWasmRecoveredTrapCount) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
size_t trap_count = trap_handler::GetRecoveredTrapCount();
return *isolate->factory()->NewNumberFromSize(trap_count);
}
RUNTIME_FUNCTION(Runtime_GetWasmExceptionId) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, exception, 0);
CONVERT_ARG_HANDLE_CHECKED(WasmInstanceObject, instance, 1);
Handle<Object> tag =
WasmExceptionPackage::GetExceptionTag(isolate, exception);
if (tag->IsWasmExceptionTag()) {
Handle<FixedArray> exceptions_table(instance->exceptions_table(), isolate);
for (int index = 0; index < exceptions_table->length(); ++index) {
if (exceptions_table->get(index) == *tag) return Smi::FromInt(index);
}
}
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_GetWasmExceptionValues) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, exception, 0);
Handle<Object> values_obj =
WasmExceptionPackage::GetExceptionValues(isolate, exception);
CHECK(values_obj->IsFixedArray()); // Only called with correct input.
Handle<FixedArray> values = Handle<FixedArray>::cast(values_obj);
return *isolate->factory()->NewJSArrayWithElements(values);
}
namespace {
bool EnableWasmThreads(v8::Local<v8::Context> context) { return true; }
bool DisableWasmThreads(v8::Local<v8::Context> context) { return false; }
} // namespace
// This runtime function enables WebAssembly threads through an embedder
// callback and thereby bypasses the value in FLAG_experimental_wasm_threads.
RUNTIME_FUNCTION(Runtime_SetWasmThreadsEnabled) {
DCHECK_EQ(1, args.length());
CONVERT_BOOLEAN_ARG_CHECKED(flag, 0);
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
v8_isolate->SetWasmThreadsEnabledCallback(flag ? EnableWasmThreads
: DisableWasmThreads);
return ReadOnlyRoots(isolate).undefined_value();
}
#define ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(Name) \
RUNTIME_FUNCTION(Runtime_Has##Name) { \
CONVERT_ARG_CHECKED(JSObject, obj, 0); \
return isolate->heap()->ToBoolean(obj->Has##Name()); \
}
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(FastElements)
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(SmiElements)
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ObjectElements)
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(SmiOrObjectElements)
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(DoubleElements)
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(HoleyElements)
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(DictionaryElements)
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(PackedElements)
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(SloppyArgumentsElements)
// Properties test sitting with elements tests - not fooling anyone.
ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(FastProperties)
#undef ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION
#define FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION(Type, type, TYPE, ctype) \
RUNTIME_FUNCTION(Runtime_HasFixed##Type##Elements) { \
CONVERT_ARG_CHECKED(JSObject, obj, 0); \
return isolate->heap()->ToBoolean(obj->HasFixed##Type##Elements()); \
}
TYPED_ARRAYS(FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION)
#undef FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION
RUNTIME_FUNCTION(Runtime_ArraySpeciesProtector) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
return isolate->heap()->ToBoolean(isolate->IsArraySpeciesLookupChainIntact());
}
RUNTIME_FUNCTION(Runtime_MapIteratorProtector) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
return isolate->heap()->ToBoolean(isolate->IsMapIteratorLookupChainIntact());
}
RUNTIME_FUNCTION(Runtime_SetIteratorProtector) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
return isolate->heap()->ToBoolean(isolate->IsSetIteratorLookupChainIntact());
}
RUNTIME_FUNCTION(Runtime_StringIteratorProtector) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
return isolate->heap()->ToBoolean(
isolate->IsStringIteratorLookupChainIntact());
}
// Take a compiled wasm module and serialize it into an array buffer, which is
// then returned.
RUNTIME_FUNCTION(Runtime_SerializeWasmModule) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(WasmModuleObject, module_obj, 0);
wasm::NativeModule* native_module = module_obj->native_module();
wasm::WasmSerializer wasm_serializer(native_module);
size_t compiled_size = wasm_serializer.GetSerializedNativeModuleSize();
void* array_data = isolate->array_buffer_allocator()->Allocate(compiled_size);
Handle<JSArrayBuffer> array_buffer =
isolate->factory()->NewJSArrayBuffer(SharedFlag::kNotShared);
JSArrayBuffer::Setup(array_buffer, isolate, false, array_data, compiled_size);
if (!array_data ||
!wasm_serializer.SerializeNativeModule(
{reinterpret_cast<uint8_t*>(array_data), compiled_size})) {
return ReadOnlyRoots(isolate).undefined_value();
}
return *array_buffer;
}
// Take an array buffer and attempt to reconstruct a compiled wasm module.
// Return undefined if unsuccessful.
RUNTIME_FUNCTION(Runtime_DeserializeWasmModule) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSArrayBuffer, buffer, 0);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, wire_bytes, 1);
CHECK(!buffer->was_detached());
CHECK(!wire_bytes->WasDetached());
Handle<JSArrayBuffer> wire_bytes_buffer = wire_bytes->GetBuffer();
Vector<const uint8_t> wire_bytes_vec{
reinterpret_cast<const uint8_t*>(wire_bytes_buffer->backing_store()) +
wire_bytes->byte_offset(),
wire_bytes->byte_length()};
Vector<uint8_t> buffer_vec{
reinterpret_cast<uint8_t*>(buffer->backing_store()),
buffer->byte_length()};
// Note that {wasm::DeserializeNativeModule} will allocate. We assume the
// JSArrayBuffer backing store doesn't get relocated.
MaybeHandle<WasmModuleObject> maybe_module_object =
wasm::DeserializeNativeModule(isolate, buffer_vec, wire_bytes_vec);
Handle<WasmModuleObject> module_object;
if (!maybe_module_object.ToHandle(&module_object)) {
return ReadOnlyRoots(isolate).undefined_value();
}
return *module_object;
}
RUNTIME_FUNCTION(Runtime_HeapObjectVerify) {
HandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
#ifdef VERIFY_HEAP
object->ObjectVerify(isolate);
#else
CHECK(object->IsObject());
if (object->IsHeapObject()) {
CHECK(HeapObject::cast(*object)->map()->IsMap());
} else {
CHECK(object->IsSmi());
}
#endif
return isolate->heap()->ToBoolean(true);
}
RUNTIME_FUNCTION(Runtime_WasmGetNumberOfInstances) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(WasmModuleObject, module_obj, 0);
int instance_count = 0;
WeakArrayList weak_instance_list = module_obj->weak_instance_list();
for (int i = 0; i < weak_instance_list->length(); ++i) {
if (weak_instance_list->Get(i)->IsWeak()) instance_count++;
}
return Smi::FromInt(instance_count);
}
RUNTIME_FUNCTION(Runtime_WasmNumInterpretedCalls) {
DCHECK_EQ(1, args.length());
HandleScope scope(isolate);
CONVERT_ARG_HANDLE_CHECKED(WasmInstanceObject, instance, 0);
if (!instance->has_debug_info()) return Object();
uint64_t num = instance->debug_info()->NumInterpretedCalls();
return *isolate->factory()->NewNumberFromSize(static_cast<size_t>(num));
}
RUNTIME_FUNCTION(Runtime_RedirectToWasmInterpreter) {
DCHECK_EQ(2, args.length());
HandleScope scope(isolate);
CONVERT_ARG_HANDLE_CHECKED(WasmInstanceObject, instance, 0);
CONVERT_SMI_ARG_CHECKED(function_index, 1);
Handle<WasmDebugInfo> debug_info =
WasmInstanceObject::GetOrCreateDebugInfo(instance);
WasmDebugInfo::RedirectToInterpreter(debug_info,
Vector<int>(&function_index, 1));
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_WasmTraceMemory) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(Smi, info_addr, 0);
wasm::MemoryTracingInfo* info =
reinterpret_cast<wasm::MemoryTracingInfo*>(info_addr.ptr());
// Find the caller wasm frame.
StackTraceFrameIterator it(isolate);
DCHECK(!it.done());
DCHECK(it.is_wasm());
WasmCompiledFrame* frame = WasmCompiledFrame::cast(it.frame());
uint8_t* mem_start = reinterpret_cast<uint8_t*>(
frame->wasm_instance()->memory_object()->array_buffer()->backing_store());
int func_index = frame->function_index();
int pos = frame->position();
// TODO(titzer): eliminate dependency on WasmModule definition here.
int func_start =
frame->wasm_instance()->module()->functions[func_index].code.offset();
wasm::ExecutionTier tier = frame->wasm_code()->is_liftoff()
? wasm::ExecutionTier::kBaseline
: wasm::ExecutionTier::kOptimized;
wasm::TraceMemoryOperation(tier, info, func_index, pos - func_start,
mem_start);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_WasmTierUpFunction) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(WasmInstanceObject, instance, 0);
CONVERT_SMI_ARG_CHECKED(function_index, 1);
auto* native_module = instance->module_object()->native_module();
isolate->wasm_engine()->CompileFunction(
isolate, native_module, function_index, wasm::ExecutionTier::kOptimized);
CHECK(!native_module->compilation_state()->failed());
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_IsLiftoffFunction) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
CHECK(WasmExportedFunction::IsWasmExportedFunction(*function));
Handle<WasmExportedFunction> exp_fun =
Handle<WasmExportedFunction>::cast(function);
wasm::NativeModule* native_module =
exp_fun->instance()->module_object()->native_module();
uint32_t func_index = exp_fun->function_index();
return isolate->heap()->ToBoolean(
native_module->has_code(func_index) &&
native_module->code(func_index)->is_liftoff());
}
RUNTIME_FUNCTION(Runtime_CompleteInobjectSlackTracking) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
object->map()->CompleteInobjectSlackTracking(isolate);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_FreezeWasmLazyCompilation) {
DCHECK_EQ(1, args.length());
DisallowHeapAllocation no_gc;
CONVERT_ARG_CHECKED(WasmInstanceObject, instance, 0);
instance->module_object()->native_module()->set_lazy_compile_frozen(true);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_WasmMemoryHasFullGuardRegion) {
DCHECK_EQ(1, args.length());
DisallowHeapAllocation no_gc;
CONVERT_ARG_CHECKED(WasmMemoryObject, memory, 0);
return isolate->heap()->ToBoolean(memory->has_full_guard_region(isolate));
}
} // namespace internal
} // namespace v8