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cobalt / cobalt / f309f9a11671768c59005e71c207e268484cbe9f / . / src / third_party / v8 / src / execution / messages.cc
blob: ea31dc3374fac578370bf09a28d88f158c9fed70 [file] [log] [blame]
// Copyright 2011 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/execution/messages.h"
#include <memory>
#include "src/api/api-inl.h"
#include "src/ast/ast.h"
#include "src/ast/prettyprinter.h"
#include "src/base/v8-fallthrough.h"
#include "src/execution/execution.h"
#include "src/execution/frames-inl.h"
#include "src/execution/frames.h"
#include "src/execution/isolate-inl.h"
#include "src/logging/counters.h"
#include "src/objects/foreign-inl.h"
#include "src/objects/frame-array-inl.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/keys.h"
#include "src/objects/stack-frame-info-inl.h"
#include "src/objects/struct-inl.h"
#include "src/parsing/parse-info.h"
#include "src/parsing/parsing.h"
#include "src/roots/roots.h"
#include "src/strings/string-builder-inl.h"
#include "src/wasm/wasm-code-manager.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
MessageLocation::MessageLocation(Handle<Script> script, int start_pos,
int end_pos)
: script_(script),
start_pos_(start_pos),
end_pos_(end_pos),
bytecode_offset_(-1) {}
MessageLocation::MessageLocation(Handle<Script> script, int start_pos,
int end_pos, Handle<SharedFunctionInfo> shared)
: script_(script),
start_pos_(start_pos),
end_pos_(end_pos),
bytecode_offset_(-1),
shared_(shared) {}
MessageLocation::MessageLocation(Handle<Script> script,
Handle<SharedFunctionInfo> shared,
int bytecode_offset)
: script_(script),
start_pos_(-1),
end_pos_(-1),
bytecode_offset_(bytecode_offset),
shared_(shared) {}
MessageLocation::MessageLocation()
: start_pos_(-1), end_pos_(-1), bytecode_offset_(-1) {}
// If no message listeners have been registered this one is called
// by default.
void MessageHandler::DefaultMessageReport(Isolate* isolate,
const MessageLocation* loc,
Handle<Object> message_obj) {
std::unique_ptr<char[]> str = GetLocalizedMessage(isolate, message_obj);
if (loc == nullptr) {
PrintF("%s\n", str.get());
} else {
HandleScope scope(isolate);
Handle<Object> data(loc->script()->name(), isolate);
std::unique_ptr<char[]> data_str;
if (data->IsString())
data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS);
PrintF("%s:%i: %s\n", data_str.get() ? data_str.get() : "<unknown>",
loc->start_pos(), str.get());
}
}
Handle<JSMessageObject> MessageHandler::MakeMessageObject(
Isolate* isolate, MessageTemplate message, const MessageLocation* location,
Handle<Object> argument, Handle<FixedArray> stack_frames) {
Factory* factory = isolate->factory();
int start = -1;
int end = -1;
int bytecode_offset = -1;
Handle<Script> script_handle = isolate->factory()->empty_script();
Handle<SharedFunctionInfo> shared_info;
if (location != nullptr && !FLAG_correctness_fuzzer_suppressions) {
start = location->start_pos();
end = location->end_pos();
script_handle = location->script();
bytecode_offset = location->bytecode_offset();
shared_info = location->shared();
}
Handle<Object> stack_frames_handle =
stack_frames.is_null() ? Handle<Object>::cast(factory->undefined_value())
: Handle<Object>::cast(stack_frames);
Handle<JSMessageObject> message_obj = factory->NewJSMessageObject(
message, argument, start, end, shared_info, bytecode_offset,
script_handle, stack_frames_handle);
return message_obj;
}
void MessageHandler::ReportMessage(Isolate* isolate, const MessageLocation* loc,
Handle<JSMessageObject> message) {
v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message);
if (api_message_obj->ErrorLevel() == v8::Isolate::kMessageError) {
// We are calling into embedder's code which can throw exceptions.
// Thus we need to save current exception state, reset it to the clean one
// and ignore scheduled exceptions callbacks can throw.
// We pass the exception object into the message handler callback though.
Object exception_object = ReadOnlyRoots(isolate).undefined_value();
if (isolate->has_pending_exception()) {
exception_object = isolate->pending_exception();
}
Handle<Object> exception(exception_object, isolate);
Isolate::ExceptionScope exception_scope(isolate);
isolate->clear_pending_exception();
isolate->set_external_caught_exception(false);
// Turn the exception on the message into a string if it is an object.
if (message->argument().IsJSObject()) {
HandleScope scope(isolate);
Handle<Object> argument(message->argument(), isolate);
MaybeHandle<Object> maybe_stringified;
Handle<Object> stringified;
// Make sure we don't leak uncaught internally generated Error objects.
if (argument->IsJSError()) {
maybe_stringified = Object::NoSideEffectsToString(isolate, argument);
} else {
v8::TryCatch catcher(reinterpret_cast<v8::Isolate*>(isolate));
catcher.SetVerbose(false);
catcher.SetCaptureMessage(false);
maybe_stringified = Object::ToString(isolate, argument);
}
if (!maybe_stringified.ToHandle(&stringified)) {
DCHECK(isolate->has_pending_exception());
isolate->clear_pending_exception();
isolate->set_external_caught_exception(false);
stringified =
isolate->factory()->NewStringFromAsciiChecked("exception");
}
message->set_argument(*stringified);
}
v8::Local<v8::Value> api_exception_obj = v8::Utils::ToLocal(exception);
ReportMessageNoExceptions(isolate, loc, message, api_exception_obj);
} else {
ReportMessageNoExceptions(isolate, loc, message, v8::Local<v8::Value>());
}
}
void MessageHandler::ReportMessageNoExceptions(
Isolate* isolate, const MessageLocation* loc, Handle<Object> message,
v8::Local<v8::Value> api_exception_obj) {
v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message);
int error_level = api_message_obj->ErrorLevel();
Handle<TemplateList> global_listeners =
isolate->factory()->message_listeners();
int global_length = global_listeners->length();
if (global_length == 0) {
DefaultMessageReport(isolate, loc, message);
if (isolate->has_scheduled_exception()) {
isolate->clear_scheduled_exception();
}
} else {
for (int i = 0; i < global_length; i++) {
HandleScope scope(isolate);
if (global_listeners->get(i).IsUndefined(isolate)) continue;
FixedArray listener = FixedArray::cast(global_listeners->get(i));
Foreign callback_obj = Foreign::cast(listener.get(0));
int32_t message_levels =
static_cast<int32_t>(Smi::ToInt(listener.get(2)));
if (!(message_levels & error_level)) {
continue;
}
v8::MessageCallback callback =
FUNCTION_CAST<v8::MessageCallback>(callback_obj.foreign_address());
Handle<Object> callback_data(listener.get(1), isolate);
{
RuntimeCallTimerScope timer(
isolate, RuntimeCallCounterId::kMessageListenerCallback);
// Do not allow exceptions to propagate.
v8::TryCatch try_catch(reinterpret_cast<v8::Isolate*>(isolate));
callback(api_message_obj, callback_data->IsUndefined(isolate)
? api_exception_obj
: v8::Utils::ToLocal(callback_data));
}
if (isolate->has_scheduled_exception()) {
isolate->clear_scheduled_exception();
}
}
}
}
Handle<String> MessageHandler::GetMessage(Isolate* isolate,
Handle<Object> data) {
Handle<JSMessageObject> message = Handle<JSMessageObject>::cast(data);
Handle<Object> arg = Handle<Object>(message->argument(), isolate);
return MessageFormatter::Format(isolate, message->type(), arg);
}
std::unique_ptr<char[]> MessageHandler::GetLocalizedMessage(
Isolate* isolate, Handle<Object> data) {
HandleScope scope(isolate);
return GetMessage(isolate, data)->ToCString(DISALLOW_NULLS);
}
namespace {
Object EvalFromFunctionName(Isolate* isolate, Handle<Script> script) {
if (!script->has_eval_from_shared()) {
return ReadOnlyRoots(isolate).undefined_value();
}
Handle<SharedFunctionInfo> shared(script->eval_from_shared(), isolate);
// Find the name of the function calling eval.
if (shared->Name().BooleanValue(isolate)) {
return shared->Name();
}
return shared->inferred_name();
}
MaybeHandle<String> FormatEvalOrigin(Isolate* isolate, Handle<Script> script) {
Handle<Object> sourceURL(script->GetNameOrSourceURL(), isolate);
if (!sourceURL->IsUndefined(isolate)) {
DCHECK(sourceURL->IsString());
return Handle<String>::cast(sourceURL);
}
IncrementalStringBuilder builder(isolate);
builder.AppendCString("eval at ");
Handle<Object> eval_from_function_name =
handle(EvalFromFunctionName(isolate, script), isolate);
if (eval_from_function_name->BooleanValue(isolate)) {
Handle<String> str;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, str, Object::ToString(isolate, eval_from_function_name),
String);
builder.AppendString(str);
} else {
builder.AppendCString("<anonymous>");
}
if (script->has_eval_from_shared()) {
Handle<SharedFunctionInfo> eval_from_shared(script->eval_from_shared(),
isolate);
if (eval_from_shared->script().IsScript()) {
Handle<Script> eval_from_script =
handle(Script::cast(eval_from_shared->script()), isolate);
builder.AppendCString(" (");
if (eval_from_script->compilation_type() ==
Script::COMPILATION_TYPE_EVAL) {
// Eval script originated from another eval.
Handle<String> str;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, str, FormatEvalOrigin(isolate, eval_from_script), String);
builder.AppendString(str);
} else {
DCHECK(eval_from_script->compilation_type() !=
Script::COMPILATION_TYPE_EVAL);
// eval script originated from "real" source.
Handle<Object> name_obj = handle(eval_from_script->name(), isolate);
if (eval_from_script->name().IsString()) {
builder.AppendString(Handle<String>::cast(name_obj));
Script::PositionInfo info;
if (Script::GetPositionInfo(eval_from_script,
Script::GetEvalPosition(isolate, script),
&info, Script::NO_OFFSET)) {
builder.AppendCString(":");
Handle<String> str = isolate->factory()->NumberToString(
handle(Smi::FromInt(info.line + 1), isolate));
builder.AppendString(str);
builder.AppendCString(":");
str = isolate->factory()->NumberToString(
handle(Smi::FromInt(info.column + 1), isolate));
builder.AppendString(str);
}
} else {
DCHECK(!eval_from_script->name().IsString());
builder.AppendCString("unknown source");
}
}
}
builder.AppendCString(")");
}
Handle<String> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result, builder.Finish(), String);
return result;
}
} // namespace
Handle<PrimitiveHeapObject> StackFrameBase::GetEvalOrigin() {
if (!HasScript() || !IsEval()) return isolate_->factory()->undefined_value();
return FormatEvalOrigin(isolate_, GetScript()).ToHandleChecked();
}
Handle<PrimitiveHeapObject> StackFrameBase::GetWasmModuleName() {
return isolate_->factory()->undefined_value();
}
int StackFrameBase::GetWasmFunctionIndex() { return StackFrameBase::kNone; }
Handle<HeapObject> StackFrameBase::GetWasmInstance() {
return isolate_->factory()->undefined_value();
}
int StackFrameBase::GetScriptId() const {
if (!HasScript()) return kNone;
return GetScript()->id();
}
bool StackFrameBase::IsEval() {
return HasScript() &&
GetScript()->compilation_type() == Script::COMPILATION_TYPE_EVAL;
}
void JSStackFrame::FromFrameArray(Isolate* isolate, Handle<FrameArray> array,
int frame_ix) {
DCHECK(!array->IsWasmFrame(frame_ix));
isolate_ = isolate;
receiver_ = handle(array->Receiver(frame_ix), isolate);
function_ = handle(array->Function(frame_ix), isolate);
code_ = handle(array->Code(frame_ix), isolate);
offset_ = array->Offset(frame_ix).value();
cached_position_ = base::nullopt;
const int flags = array->Flags(frame_ix).value();
is_constructor_ = (flags & FrameArray::kIsConstructor) != 0;
is_strict_ = (flags & FrameArray::kIsStrict) != 0;
is_async_ = (flags & FrameArray::kIsAsync) != 0;
is_promise_all_ = (flags & FrameArray::kIsPromiseAll) != 0;
is_promise_any_ = (flags & FrameArray::kIsPromiseAny) != 0;
}
JSStackFrame::JSStackFrame(Isolate* isolate, Handle<Object> receiver,
Handle<JSFunction> function,
Handle<AbstractCode> code, int offset)
: StackFrameBase(isolate),
receiver_(receiver),
function_(function),
code_(code),
offset_(offset),
cached_position_(base::nullopt),
is_async_(false),
is_constructor_(false),
is_strict_(false) {}
Handle<Object> JSStackFrame::GetFunction() const {
return Handle<Object>::cast(function_);
}
Handle<Object> JSStackFrame::GetFileName() {
if (!HasScript()) return isolate_->factory()->null_value();
return handle(GetScript()->name(), isolate_);
}
Handle<PrimitiveHeapObject> JSStackFrame::GetFunctionName() {
Handle<String> result = JSFunction::GetDebugName(function_);
if (result->length() != 0) return result;
if (HasScript() &&
GetScript()->compilation_type() == Script::COMPILATION_TYPE_EVAL) {
return isolate_->factory()->eval_string();
}
return isolate_->factory()->null_value();
}
namespace {
bool CheckMethodName(Isolate* isolate, Handle<JSReceiver> receiver,
Handle<Name> name, Handle<JSFunction> fun,
LookupIterator::Configuration config) {
LookupIterator::Key key(isolate, name);
LookupIterator iter(isolate, receiver, key, config);
if (iter.state() == LookupIterator::DATA) {
return iter.GetDataValue().is_identical_to(fun);
} else if (iter.state() == LookupIterator::ACCESSOR) {
Handle<Object> accessors = iter.GetAccessors();
if (accessors->IsAccessorPair()) {
Handle<AccessorPair> pair = Handle<AccessorPair>::cast(accessors);
return pair->getter() == *fun || pair->setter() == *fun;
}
}
return false;
}
Handle<Object> ScriptNameOrSourceUrl(Handle<Script> script, Isolate* isolate) {
Object name_or_url = script->source_url();
if (!name_or_url.IsString()) name_or_url = script->name();
return handle(name_or_url, isolate);
}
} // namespace
Handle<Object> JSStackFrame::GetScriptNameOrSourceUrl() {
if (!HasScript()) return isolate_->factory()->null_value();
return ScriptNameOrSourceUrl(GetScript(), isolate_);
}
Handle<PrimitiveHeapObject> JSStackFrame::GetMethodName() {
if (receiver_->IsNullOrUndefined(isolate_)) {
return isolate_->factory()->null_value();
}
Handle<JSReceiver> receiver;
if (!Object::ToObject(isolate_, receiver_).ToHandle(&receiver)) {
DCHECK(isolate_->has_pending_exception());
isolate_->clear_pending_exception();
isolate_->set_external_caught_exception(false);
return isolate_->factory()->null_value();
}
Handle<String> name(function_->shared().Name(), isolate_);
name = String::Flatten(isolate_, name);
// The static initializer function is not a method, so don't add a
// class name, just return the function name.
if (name->HasOneBytePrefix(CStrVector("<static_fields_initializer>"))) {
return name;
}
// ES2015 gives getters and setters name prefixes which must
// be stripped to find the property name.
if (name->HasOneBytePrefix(CStrVector("get ")) ||
name->HasOneBytePrefix(CStrVector("set "))) {
name = isolate_->factory()->NewProperSubString(name, 4, name->length());
}
if (CheckMethodName(isolate_, receiver, name, function_,
LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR)) {
return name;
}
HandleScope outer_scope(isolate_);
Handle<PrimitiveHeapObject> result;
for (PrototypeIterator iter(isolate_, receiver, kStartAtReceiver);
!iter.IsAtEnd(); iter.Advance()) {
Handle<Object> current = PrototypeIterator::GetCurrent(iter);
if (!current->IsJSObject()) break;
Handle<JSObject> current_obj = Handle<JSObject>::cast(current);
if (current_obj->IsAccessCheckNeeded()) break;
Handle<FixedArray> keys =
KeyAccumulator::GetOwnEnumPropertyKeys(isolate_, current_obj);
for (int i = 0; i < keys->length(); i++) {
HandleScope inner_scope(isolate_);
if (!keys->get(i).IsName()) continue;
Handle<Name> name_key(Name::cast(keys->get(i)), isolate_);
if (!CheckMethodName(isolate_, current_obj, name_key, function_,
LookupIterator::OWN_SKIP_INTERCEPTOR))
continue;
// Return null in case of duplicates to avoid confusion.
if (!result.is_null()) return isolate_->factory()->null_value();
result = inner_scope.CloseAndEscape(name_key);
}
}
if (!result.is_null()) return outer_scope.CloseAndEscape(result);
return isolate_->factory()->null_value();
}
Handle<PrimitiveHeapObject> JSStackFrame::GetTypeName() {
// TODO(jgruber): Check for strict/constructor here as in
// CallSitePrototypeGetThis.
if (receiver_->IsNullOrUndefined(isolate_)) {
return isolate_->factory()->null_value();
} else if (receiver_->IsJSProxy()) {
return isolate_->factory()->Proxy_string();
}
Handle<JSReceiver> receiver;
if (!Object::ToObject(isolate_, receiver_).ToHandle(&receiver)) {
DCHECK(isolate_->has_pending_exception());
isolate_->clear_pending_exception();
isolate_->set_external_caught_exception(false);
return isolate_->factory()->null_value();
}
return JSReceiver::GetConstructorName(receiver);
}
int JSStackFrame::GetLineNumber() {
DCHECK_LE(0, GetPosition());
if (HasScript()) return Script::GetLineNumber(GetScript(), GetPosition()) + 1;
return kNone;
}
int JSStackFrame::GetColumnNumber() {
DCHECK_LE(0, GetPosition());
if (HasScript()) {
return Script::GetColumnNumber(GetScript(), GetPosition()) + 1;
}
return kNone;
}
int JSStackFrame::GetPromiseIndex() const {
return (is_promise_all_ || is_promise_any_) ? offset_ : kNone;
}
bool JSStackFrame::IsNative() {
return HasScript() && GetScript()->type() == Script::TYPE_NATIVE;
}
bool JSStackFrame::IsToplevel() {
return receiver_->IsJSGlobalProxy() || receiver_->IsNullOrUndefined(isolate_);
}
int JSStackFrame::GetPosition() const {
if (cached_position_) return *cached_position_;
Handle<SharedFunctionInfo> shared = handle(function_->shared(), isolate_);
SharedFunctionInfo::EnsureSourcePositionsAvailable(isolate_, shared);
cached_position_ = code_->SourcePosition(offset_);
return *cached_position_;
}
bool JSStackFrame::HasScript() const {
return function_->shared().script().IsScript();
}
Handle<Script> JSStackFrame::GetScript() const {
return handle(Script::cast(function_->shared().script()), isolate_);
}
void WasmStackFrame::FromFrameArray(Isolate* isolate, Handle<FrameArray> array,
int frame_ix) {
// This function is called for compiled and interpreted wasm frames, and for
// asm.js->wasm frames.
DCHECK(array->IsWasmFrame(frame_ix) ||
array->IsAsmJsWasmFrame(frame_ix));
isolate_ = isolate;
wasm_instance_ = handle(array->WasmInstance(frame_ix), isolate);
wasm_func_index_ = array->WasmFunctionIndex(frame_ix).value();
// The {WasmCode*} is held alive by the {GlobalWasmCodeRef}.
auto global_wasm_code_ref =
Managed<wasm::GlobalWasmCodeRef>::cast(array->WasmCodeObject(frame_ix));
code_ = global_wasm_code_ref.get()->code();
offset_ = array->Offset(frame_ix).value();
}
Handle<Object> WasmStackFrame::GetReceiver() const { return wasm_instance_; }
Handle<Object> WasmStackFrame::GetFunction() const {
return handle(Smi::FromInt(wasm_func_index_), isolate_);
}
Handle<PrimitiveHeapObject> WasmStackFrame::GetFunctionName() {
Handle<PrimitiveHeapObject> name;
Handle<WasmModuleObject> module_object(wasm_instance_->module_object(),
isolate_);
if (!WasmModuleObject::GetFunctionNameOrNull(isolate_, module_object,
wasm_func_index_)
.ToHandle(&name)) {
name = isolate_->factory()->null_value();
}
return name;
}
Handle<Object> WasmStackFrame::GetScriptNameOrSourceUrl() {
Handle<Script> script = GetScript();
DCHECK_EQ(Script::TYPE_WASM, script->type());
return ScriptNameOrSourceUrl(script, isolate_);
}
Handle<PrimitiveHeapObject> WasmStackFrame::GetWasmModuleName() {
Handle<PrimitiveHeapObject> module_name;
Handle<WasmModuleObject> module_object(wasm_instance_->module_object(),
isolate_);
if (!WasmModuleObject::GetModuleNameOrNull(isolate_, module_object)
.ToHandle(&module_name)) {
module_name = isolate_->factory()->null_value();
}
return module_name;
}
Handle<HeapObject> WasmStackFrame::GetWasmInstance() { return wasm_instance_; }
int WasmStackFrame::GetPosition() const {
return IsInterpreted() ? offset_ : code_->GetSourcePositionBefore(offset_);
}
int WasmStackFrame::GetColumnNumber() { return GetModuleOffset(); }
int WasmStackFrame::GetModuleOffset() const {
const int function_offset =
GetWasmFunctionOffset(wasm_instance_->module(), wasm_func_index_);
return function_offset + GetPosition();
}
Handle<Object> WasmStackFrame::GetFileName() { return Null(); }
Handle<PrimitiveHeapObject> WasmStackFrame::Null() const {
return isolate_->factory()->null_value();
}
bool WasmStackFrame::HasScript() const { return true; }
Handle<Script> WasmStackFrame::GetScript() const {
return handle(wasm_instance_->module_object().script(), isolate_);
}
void AsmJsWasmStackFrame::FromFrameArray(Isolate* isolate,
Handle<FrameArray> array,
int frame_ix) {
DCHECK(array->IsAsmJsWasmFrame(frame_ix));
WasmStackFrame::FromFrameArray(isolate, array, frame_ix);
is_at_number_conversion_ =
array->Flags(frame_ix).value() & FrameArray::kAsmJsAtNumberConversion;
}
Handle<Object> AsmJsWasmStackFrame::GetReceiver() const {
return isolate_->global_proxy();
}
Handle<Object> AsmJsWasmStackFrame::GetFunction() const {
// TODO(clemensb): Return lazily created JSFunction.
return Null();
}
Handle<Object> AsmJsWasmStackFrame::GetFileName() {
Handle<Script> script(wasm_instance_->module_object().script(), isolate_);
DCHECK(script->IsUserJavaScript());
return handle(script->name(), isolate_);
}
Handle<Object> AsmJsWasmStackFrame::GetScriptNameOrSourceUrl() {
Handle<Script> script(wasm_instance_->module_object().script(), isolate_);
DCHECK_EQ(Script::TYPE_NORMAL, script->type());
return ScriptNameOrSourceUrl(script, isolate_);
}
int AsmJsWasmStackFrame::GetPosition() const {
DCHECK_LE(0, offset_);
int byte_offset = code_->GetSourcePositionBefore(offset_);
const wasm::WasmModule* module = wasm_instance_->module();
return GetSourcePosition(module, wasm_func_index_, byte_offset,
is_at_number_conversion_);
}
int AsmJsWasmStackFrame::GetLineNumber() {
DCHECK_LE(0, GetPosition());
Handle<Script> script(wasm_instance_->module_object().script(), isolate_);
DCHECK(script->IsUserJavaScript());
return Script::GetLineNumber(script, GetPosition()) + 1;
}
int AsmJsWasmStackFrame::GetColumnNumber() {
DCHECK_LE(0, GetPosition());
Handle<Script> script(wasm_instance_->module_object().script(), isolate_);
DCHECK(script->IsUserJavaScript());
return Script::GetColumnNumber(script, GetPosition()) + 1;
}
FrameArrayIterator::FrameArrayIterator(Isolate* isolate,
Handle<FrameArray> array, int frame_ix)
: isolate_(isolate), array_(array), frame_ix_(frame_ix) {}
bool FrameArrayIterator::HasFrame() const {
return (frame_ix_ < array_->FrameCount());
}
void FrameArrayIterator::Advance() { frame_ix_++; }
StackFrameBase* FrameArrayIterator::Frame() {
DCHECK(HasFrame());
const int flags = array_->Flags(frame_ix_).value();
int flag_mask = FrameArray::kIsWasmFrame | FrameArray::kIsAsmJsWasmFrame;
switch (flags & flag_mask) {
case 0:
js_frame_.FromFrameArray(isolate_, array_, frame_ix_);
return &js_frame_;
case FrameArray::kIsWasmFrame:
wasm_frame_.FromFrameArray(isolate_, array_, frame_ix_);
return &wasm_frame_;
case FrameArray::kIsAsmJsWasmFrame:
asm_wasm_frame_.FromFrameArray(isolate_, array_, frame_ix_);
return &asm_wasm_frame_;
default:
UNREACHABLE();
}
}
namespace {
MaybeHandle<Object> ConstructCallSite(Isolate* isolate,
Handle<StackTraceFrame> frame) {
Handle<JSFunction> target =
handle(isolate->native_context()->callsite_function(), isolate);
Handle<JSObject> obj;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, obj,
JSObject::New(target, target, Handle<AllocationSite>::null()), Object);
// TODO(szuend): Introduce a new symbol "call_site_frame_symbol" and set
// it to the StackTraceFrame. The CallSite API builtins can then
// be implemented using StackFrameInfo objects.
Handle<FrameArray> frame_array(FrameArray::cast(frame->frame_array()),
isolate);
int frame_index = frame->frame_index();
Handle<Symbol> key = isolate->factory()->call_site_frame_array_symbol();
RETURN_ON_EXCEPTION(isolate,
JSObject::SetOwnPropertyIgnoreAttributes(
obj, key, frame_array, DONT_ENUM),
Object);
key = isolate->factory()->call_site_frame_index_symbol();
Handle<Object> value(Smi::FromInt(frame_index), isolate);
RETURN_ON_EXCEPTION(
isolate,
JSObject::SetOwnPropertyIgnoreAttributes(obj, key, value, DONT_ENUM),
Object);
return obj;
}
// Convert the raw frames as written by Isolate::CaptureSimpleStackTrace into
// a JSArray of JSCallSite objects.
MaybeHandle<JSArray> GetStackFrames(Isolate* isolate,
Handle<FixedArray> elems) {
const int frame_count = elems->length();
Handle<FixedArray> frames = isolate->factory()->NewFixedArray(frame_count);
for (int i = 0; i < frame_count; i++) {
Handle<Object> site;
Handle<StackTraceFrame> frame(StackTraceFrame::cast(elems->get(i)),
isolate);
ASSIGN_RETURN_ON_EXCEPTION(isolate, site, ConstructCallSite(isolate, frame),
JSArray);
frames->set(i, *site);
}
return isolate->factory()->NewJSArrayWithElements(frames);
}
MaybeHandle<Object> AppendErrorString(Isolate* isolate, Handle<Object> error,
IncrementalStringBuilder* builder) {
MaybeHandle<String> err_str =
ErrorUtils::ToString(isolate, Handle<Object>::cast(error));
if (err_str.is_null()) {
// Error.toString threw. Try to return a string representation of the thrown
// exception instead.
DCHECK(isolate->has_pending_exception());
Handle<Object> pending_exception =
handle(isolate->pending_exception(), isolate);
isolate->clear_pending_exception();
isolate->set_external_caught_exception(false);
err_str = ErrorUtils::ToString(isolate, pending_exception);
if (err_str.is_null()) {
// Formatting the thrown exception threw again, give up.
DCHECK(isolate->has_pending_exception());
isolate->clear_pending_exception();
isolate->set_external_caught_exception(false);
builder->AppendCString("<error>");
} else {
// Formatted thrown exception successfully, append it.
builder->AppendCString("<error: ");
builder->AppendString(err_str.ToHandleChecked());
builder->AppendCharacter('>');
}
} else {
builder->AppendString(err_str.ToHandleChecked());
}
return error;
}
class PrepareStackTraceScope {
public:
explicit PrepareStackTraceScope(Isolate* isolate) : isolate_(isolate) {
DCHECK(!isolate_->formatting_stack_trace());
isolate_->set_formatting_stack_trace(true);
}
~PrepareStackTraceScope() { isolate_->set_formatting_stack_trace(false); }
private:
Isolate* isolate_;
DISALLOW_COPY_AND_ASSIGN(PrepareStackTraceScope);
};
} // namespace
// static
MaybeHandle<Object> ErrorUtils::FormatStackTrace(Isolate* isolate,
Handle<JSObject> error,
Handle<Object> raw_stack) {
DCHECK(raw_stack->IsFixedArray());
Handle<FixedArray> elems = Handle<FixedArray>::cast(raw_stack);
const bool in_recursion = isolate->formatting_stack_trace();
if (!in_recursion) {
Handle<Context> error_context = error->GetCreationContext();
DCHECK(error_context->IsNativeContext());
if (isolate->HasPrepareStackTraceCallback()) {
PrepareStackTraceScope scope(isolate);
Handle<JSArray> sites;
ASSIGN_RETURN_ON_EXCEPTION(isolate, sites, GetStackFrames(isolate, elems),
Object);
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
isolate->RunPrepareStackTraceCallback(error_context, error, sites),
Object);
return result;
} else {
Handle<JSFunction> global_error =
handle(error_context->error_function(), isolate);
// If there's a user-specified "prepareStackTrace" function, call it on
// the frames and use its result.
Handle<Object> prepare_stack_trace;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, prepare_stack_trace,
JSFunction::GetProperty(isolate, global_error, "prepareStackTrace"),
Object);
if (prepare_stack_trace->IsJSFunction()) {
PrepareStackTraceScope scope(isolate);
isolate->CountUsage(v8::Isolate::kErrorPrepareStackTrace);
Handle<JSArray> sites;
ASSIGN_RETURN_ON_EXCEPTION(isolate, sites,
GetStackFrames(isolate, elems), Object);
const int argc = 2;
ScopedVector<Handle<Object>> argv(argc);
argv[0] = error;
argv[1] = sites;
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
Execution::Call(isolate, prepare_stack_trace, global_error, argc,
argv.begin()),
Object);
return result;
}
}
}
// Otherwise, run our internal formatting logic.
IncrementalStringBuilder builder(isolate);
RETURN_ON_EXCEPTION(isolate, AppendErrorString(isolate, error, &builder),
Object);
wasm::WasmCodeRefScope wasm_code_ref_scope;
for (int i = 0; i < elems->length(); ++i) {
builder.AppendCString("\n at ");
Handle<StackTraceFrame> frame(StackTraceFrame::cast(elems->get(i)),
isolate);
SerializeStackTraceFrame(isolate, frame, &builder);
if (isolate->has_pending_exception()) {
// CallSite.toString threw. Parts of the current frame might have been
// stringified already regardless. Still, try to append a string
// representation of the thrown exception.
Handle<Object> pending_exception =
handle(isolate->pending_exception(), isolate);
isolate->clear_pending_exception();
isolate->set_external_caught_exception(false);
MaybeHandle<String> exception_string =
ErrorUtils::ToString(isolate, pending_exception);
if (exception_string.is_null()) {
// Formatting the thrown exception threw again, give up.
builder.AppendCString("<error>");
} else {
// Formatted thrown exception successfully, append it.
builder.AppendCString("<error: ");
builder.AppendString(exception_string.ToHandleChecked());
builder.AppendCString("<error>");
}
}
}
return builder.Finish();
}
Handle<String> MessageFormatter::Format(Isolate* isolate, MessageTemplate index,
Handle<Object> arg0,
Handle<Object> arg1,
Handle<Object> arg2) {
Factory* factory = isolate->factory();
Handle<String> arg0_string = factory->empty_string();
if (!arg0.is_null()) {
arg0_string = Object::NoSideEffectsToString(isolate, arg0);
}
Handle<String> arg1_string = factory->empty_string();
if (!arg1.is_null()) {
arg1_string = Object::NoSideEffectsToString(isolate, arg1);
}
Handle<String> arg2_string = factory->empty_string();
if (!arg2.is_null()) {
arg2_string = Object::NoSideEffectsToString(isolate, arg2);
}
MaybeHandle<String> maybe_result_string = MessageFormatter::Format(
isolate, index, arg0_string, arg1_string, arg2_string);
Handle<String> result_string;
if (!maybe_result_string.ToHandle(&result_string)) {
DCHECK(isolate->has_pending_exception());
isolate->clear_pending_exception();
return factory->InternalizeString(StaticCharVector("<error>"));
}
// A string that has been obtained from JS code in this way is
// likely to be a complicated ConsString of some sort. We flatten it
// here to improve the efficiency of converting it to a C string and
// other operations that are likely to take place (see GetLocalizedMessage
// for example).
return String::Flatten(isolate, result_string);
}
const char* MessageFormatter::TemplateString(MessageTemplate index) {
switch (index) {
#define CASE(NAME, STRING) \
case MessageTemplate::k##NAME: \
return STRING;
MESSAGE_TEMPLATES(CASE)
#undef CASE
case MessageTemplate::kMessageCount:
default:
return nullptr;
}
}
MaybeHandle<String> MessageFormatter::Format(Isolate* isolate,
MessageTemplate index,
Handle<String> arg0,
Handle<String> arg1,
Handle<String> arg2) {
const char* template_string = TemplateString(index);
if (template_string == nullptr) {
isolate->ThrowIllegalOperation();
return MaybeHandle<String>();
}
IncrementalStringBuilder builder(isolate);
unsigned int i = 0;
Handle<String> args[] = {arg0, arg1, arg2};
for (const char* c = template_string; *c != '\0'; c++) {
if (*c == '%') {
// %% results in verbatim %.
if (*(c + 1) == '%') {
c++;
builder.AppendCharacter('%');
} else {
DCHECK(i < arraysize(args));
Handle<String> arg = args[i++];
builder.AppendString(arg);
}
} else {
builder.AppendCharacter(*c);
}
}
return builder.Finish();
}
MaybeHandle<JSObject> ErrorUtils::Construct(Isolate* isolate,
Handle<JSFunction> target,
Handle<Object> new_target,
Handle<Object> message) {
FrameSkipMode mode = SKIP_FIRST;
Handle<Object> caller;
// When we're passed a JSFunction as new target, we can skip frames until that
// specific function is seen instead of unconditionally skipping the first
// frame.
if (new_target->IsJSFunction()) {
mode = SKIP_UNTIL_SEEN;
caller = new_target;
}
return ErrorUtils::Construct(isolate, target, new_target, message, mode,
caller,
ErrorUtils::StackTraceCollection::kDetailed);
}
MaybeHandle<JSObject> ErrorUtils::Construct(
Isolate* isolate, Handle<JSFunction> target, Handle<Object> new_target,
Handle<Object> message, FrameSkipMode mode, Handle<Object> caller,
StackTraceCollection stack_trace_collection) {
if (FLAG_correctness_fuzzer_suppressions) {
// Abort range errors in correctness fuzzing, as their causes differ
// accross correctness-fuzzing scenarios.
if (target.is_identical_to(isolate->range_error_function())) {
FATAL("Aborting on range error");
}
// Ignore error messages in correctness fuzzing, because the spec leaves
// room for undefined behavior.
message = isolate->factory()->InternalizeUtf8String(
"Message suppressed for fuzzers (--correctness-fuzzer-suppressions)");
}
// 1. If NewTarget is undefined, let newTarget be the active function object,
// else let newTarget be NewTarget.
Handle<JSReceiver> new_target_recv =
new_target->IsJSReceiver() ? Handle<JSReceiver>::cast(new_target)
: Handle<JSReceiver>::cast(target);
// 2. Let O be ? OrdinaryCreateFromConstructor(newTarget, "%ErrorPrototype%",
// « [[ErrorData]] »).
Handle<JSObject> err;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, err,
JSObject::New(target, new_target_recv, Handle<AllocationSite>::null()),
JSObject);
// 3. If message is not undefined, then
// a. Let msg be ? ToString(message).
// b. Let msgDesc be the PropertyDescriptor{[[Value]]: msg, [[Writable]]:
// true, [[Enumerable]]: false, [[Configurable]]: true}.
// c. Perform ! DefinePropertyOrThrow(O, "message", msgDesc).
// 4. Return O.
if (!message->IsUndefined(isolate)) {
Handle<String> msg_string;
ASSIGN_RETURN_ON_EXCEPTION(isolate, msg_string,
Object::ToString(isolate, message), JSObject);
RETURN_ON_EXCEPTION(
isolate,
JSObject::SetOwnPropertyIgnoreAttributes(
err, isolate->factory()->message_string(), msg_string, DONT_ENUM),
JSObject);
}
switch (stack_trace_collection) {
case StackTraceCollection::kDetailed:
RETURN_ON_EXCEPTION(
isolate, isolate->CaptureAndSetDetailedStackTrace(err), JSObject);
V8_FALLTHROUGH;
case StackTraceCollection::kSimple:
RETURN_ON_EXCEPTION(
isolate, isolate->CaptureAndSetSimpleStackTrace(err, mode, caller),
JSObject);
break;
case StackTraceCollection::kNone:
break;
}
return err;
}
namespace {
MaybeHandle<String> GetStringPropertyOrDefault(Isolate* isolate,
Handle<JSReceiver> recv,
Handle<String> key,
Handle<String> default_str) {
Handle<Object> obj;
ASSIGN_RETURN_ON_EXCEPTION(isolate, obj,
JSObject::GetProperty(isolate, recv, key), String);
Handle<String> str;
if (obj->IsUndefined(isolate)) {
str = default_str;
} else {
ASSIGN_RETURN_ON_EXCEPTION(isolate, str, Object::ToString(isolate, obj),
String);
}
return str;
}
} // namespace
// ES6 section 19.5.3.4 Error.prototype.toString ( )
MaybeHandle<String> ErrorUtils::ToString(Isolate* isolate,
Handle<Object> receiver) {
// 1. Let O be the this value.
// 2. If Type(O) is not Object, throw a TypeError exception.
if (!receiver->IsJSReceiver()) {
return isolate->Throw<String>(isolate->factory()->NewTypeError(
MessageTemplate::kIncompatibleMethodReceiver,
isolate->factory()->NewStringFromAsciiChecked(
"Error.prototype.toString"),
receiver));
}
Handle<JSReceiver> recv = Handle<JSReceiver>::cast(receiver);
// 3. Let name be ? Get(O, "name").
// 4. If name is undefined, let name be "Error"; otherwise let name be
// ? ToString(name).
Handle<String> name_key = isolate->factory()->name_string();
Handle<String> name_default = isolate->factory()->Error_string();
Handle<String> name;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, name,
GetStringPropertyOrDefault(isolate, recv, name_key, name_default),
String);
// 5. Let msg be ? Get(O, "message").
// 6. If msg is undefined, let msg be the empty String; otherwise let msg be
// ? ToString(msg).
Handle<String> msg_key = isolate->factory()->message_string();
Handle<String> msg_default = isolate->factory()->empty_string();
Handle<String> msg;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, msg,
GetStringPropertyOrDefault(isolate, recv, msg_key, msg_default), String);
// 7. If name is the empty String, return msg.
// 8. If msg is the empty String, return name.
if (name->length() == 0) return msg;
if (msg->length() == 0) return name;
// 9. Return the result of concatenating name, the code unit 0x003A (COLON),
// the code unit 0x0020 (SPACE), and msg.
IncrementalStringBuilder builder(isolate);
builder.AppendString(name);
builder.AppendCString(": ");
builder.AppendString(msg);
Handle<String> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result, builder.Finish(), String);
return result;
}
namespace {
Handle<String> DoFormatMessage(Isolate* isolate, MessageTemplate index,
Handle<Object> arg0, Handle<Object> arg1,
Handle<Object> arg2) {
Handle<String> arg0_str = Object::NoSideEffectsToString(isolate, arg0);
Handle<String> arg1_str = Object::NoSideEffectsToString(isolate, arg1);
Handle<String> arg2_str = Object::NoSideEffectsToString(isolate, arg2);
isolate->native_context()->IncrementErrorsThrown();
Handle<String> msg;
if (!MessageFormatter::Format(isolate, index, arg0_str, arg1_str, arg2_str)
.ToHandle(&msg)) {
DCHECK(isolate->has_pending_exception());
isolate->clear_pending_exception();
isolate->set_external_caught_exception(false);
return isolate->factory()->NewStringFromAsciiChecked("<error>");
}
return msg;
}
} // namespace
// static
Handle<JSObject> ErrorUtils::MakeGenericError(
Isolate* isolate, Handle<JSFunction> constructor, MessageTemplate index,
Handle<Object> arg0, Handle<Object> arg1, Handle<Object> arg2,
FrameSkipMode mode) {
if (FLAG_clear_exceptions_on_js_entry) {
// This function used to be implemented in JavaScript, and JSEntry
// clears any pending exceptions - so whenever we'd call this from C++,
// pending exceptions would be cleared. Preserve this behavior.
isolate->clear_pending_exception();
}
Handle<String> msg = DoFormatMessage(isolate, index, arg0, arg1, arg2);
DCHECK(mode != SKIP_UNTIL_SEEN);
Handle<Object> no_caller;
// The call below can't fail because constructor is a builtin.
DCHECK(constructor->shared().HasBuiltinId());
return ErrorUtils::Construct(isolate, constructor, constructor, msg, mode,
no_caller, StackTraceCollection::kDetailed)
.ToHandleChecked();
}
namespace {
bool ComputeLocation(Isolate* isolate, MessageLocation* target) {
JavaScriptFrameIterator it(isolate);
if (!it.done()) {
// Compute the location from the function and the relocation info of the
// baseline code. For optimized code this will use the deoptimization
// information to get canonical location information.
std::vector<FrameSummary> frames;
it.frame()->Summarize(&frames);
auto& summary = frames.back().AsJavaScript();
Handle<SharedFunctionInfo> shared(summary.function()->shared(), isolate);
Handle<Object> script(shared->script(), isolate);
SharedFunctionInfo::EnsureSourcePositionsAvailable(isolate, shared);
int pos = summary.abstract_code()->SourcePosition(summary.code_offset());
if (script->IsScript() &&
!(Handle<Script>::cast(script)->source().IsUndefined(isolate))) {
Handle<Script> casted_script = Handle<Script>::cast(script);
*target = MessageLocation(casted_script, pos, pos + 1, shared);
return true;
}
}
return false;
}
Handle<String> BuildDefaultCallSite(Isolate* isolate, Handle<Object> object) {
IncrementalStringBuilder builder(isolate);
builder.AppendString(Object::TypeOf(isolate, object));
if (object->IsString()) {
builder.AppendCString(" \"");
Handle<String> string = Handle<String>::cast(object);
// This threshold must be sufficiently far below String::kMaxLength that
// the {builder}'s result can never exceed that limit.
constexpr int kMaxPrintedStringLength = 100;
if (string->length() <= kMaxPrintedStringLength) {
builder.AppendString(string);
} else {
string = isolate->factory()->NewProperSubString(string, 0,
kMaxPrintedStringLength);
builder.AppendString(string);
builder.AppendCString("<...>");
}
builder.AppendCString("\"");
} else if (object->IsNull(isolate)) {
builder.AppendCString(" ");
builder.AppendString(isolate->factory()->null_string());
} else if (object->IsTrue(isolate)) {
builder.AppendCString(" ");
builder.AppendString(isolate->factory()->true_string());
} else if (object->IsFalse(isolate)) {
builder.AppendCString(" ");
builder.AppendString(isolate->factory()->false_string());
} else if (object->IsNumber()) {
builder.AppendCString(" ");
builder.AppendString(isolate->factory()->NumberToString(object));
}
return builder.Finish().ToHandleChecked();
}
Handle<String> RenderCallSite(Isolate* isolate, Handle<Object> object,
MessageLocation* location,
CallPrinter::ErrorHint* hint) {
if (ComputeLocation(isolate, location)) {
UnoptimizedCompileFlags flags = UnoptimizedCompileFlags::ForFunctionCompile(
isolate, *location->shared());
UnoptimizedCompileState compile_state(isolate);
ParseInfo info(isolate, flags, &compile_state);
if (parsing::ParseAny(&info, location->shared(), isolate,
parsing::ReportStatisticsMode::kNo)) {
info.ast_value_factory()->Internalize(isolate);
CallPrinter printer(isolate, location->shared()->IsUserJavaScript());
Handle<String> str = printer.Print(info.literal(), location->start_pos());
*hint = printer.GetErrorHint();
if (str->length() > 0) return str;
}
}
return BuildDefaultCallSite(isolate, object);
}
MessageTemplate UpdateErrorTemplate(CallPrinter::ErrorHint hint,
MessageTemplate default_id) {
switch (hint) {
case CallPrinter::ErrorHint::kNormalIterator:
return MessageTemplate::kNotIterable;
case CallPrinter::ErrorHint::kCallAndNormalIterator:
return MessageTemplate::kNotCallableOrIterable;
case CallPrinter::ErrorHint::kAsyncIterator:
return MessageTemplate::kNotAsyncIterable;
case CallPrinter::ErrorHint::kCallAndAsyncIterator:
return MessageTemplate::kNotCallableOrAsyncIterable;
case CallPrinter::ErrorHint::kNone:
return default_id;
}
}
} // namespace
Handle<JSObject> ErrorUtils::NewIteratorError(Isolate* isolate,
Handle<Object> source) {
MessageLocation location;
CallPrinter::ErrorHint hint = CallPrinter::kNone;
Handle<String> callsite = RenderCallSite(isolate, source, &location, &hint);
MessageTemplate id = MessageTemplate::kNotIterableNoSymbolLoad;
if (hint == CallPrinter::kNone) {
Handle<Symbol> iterator_symbol = isolate->factory()->iterator_symbol();
return isolate->factory()->NewTypeError(id, callsite, iterator_symbol);
}
id = UpdateErrorTemplate(hint, id);
return isolate->factory()->NewTypeError(id, callsite);
}
Object ErrorUtils::ThrowSpreadArgError(Isolate* isolate, MessageTemplate id,
Handle<Object> object) {
MessageLocation location;
Handle<String> callsite;
if (ComputeLocation(isolate, &location)) {
UnoptimizedCompileFlags flags = UnoptimizedCompileFlags::ForFunctionCompile(
isolate, *location.shared());
UnoptimizedCompileState compile_state(isolate);
ParseInfo info(isolate, flags, &compile_state);
if (parsing::ParseAny(&info, location.shared(), isolate,
parsing::ReportStatisticsMode::kNo)) {
info.ast_value_factory()->Internalize(isolate);
CallPrinter printer(isolate, location.shared()->IsUserJavaScript(),
CallPrinter::SpreadErrorInArgsHint::kErrorInArgs);
Handle<String> str = printer.Print(info.literal(), location.start_pos());
callsite =
str->length() > 0 ? str : BuildDefaultCallSite(isolate, object);
if (printer.spread_arg() != nullptr) {
// Change the message location to point at the property name.
int pos = printer.spread_arg()->position();
location =
MessageLocation(location.script(), pos, pos + 1, location.shared());
}
} else {
callsite = BuildDefaultCallSite(isolate, object);
}
}
isolate->ThrowAt(isolate->factory()->NewTypeError(id, callsite, object),
&location);
return ReadOnlyRoots(isolate).exception();
}
Handle<JSObject> ErrorUtils::NewCalledNonCallableError(Isolate* isolate,
Handle<Object> source) {
MessageLocation location;
CallPrinter::ErrorHint hint = CallPrinter::kNone;
Handle<String> callsite = RenderCallSite(isolate, source, &location, &hint);
MessageTemplate id = MessageTemplate::kCalledNonCallable;
id = UpdateErrorTemplate(hint, id);
return isolate->factory()->NewTypeError(id, callsite);
}
Handle<JSObject> ErrorUtils::NewConstructedNonConstructable(
Isolate* isolate, Handle<Object> source) {
MessageLocation location;
CallPrinter::ErrorHint hint = CallPrinter::kNone;
Handle<String> callsite = RenderCallSite(isolate, source, &location, &hint);
MessageTemplate id = MessageTemplate::kNotConstructor;
return isolate->factory()->NewTypeError(id, callsite);
}
Object ErrorUtils::ThrowLoadFromNullOrUndefined(Isolate* isolate,
Handle<Object> object,
MaybeHandle<Object> key) {
DCHECK(object->IsNullOrUndefined());
MaybeHandle<String> maybe_property_name;
// Try to extract the property name from the given key, if any.
Handle<Object> key_handle;
if (key.ToHandle(&key_handle)) {
if (key_handle->IsString()) {
maybe_property_name = Handle<String>::cast(key_handle);
}
}
Handle<String> callsite;
// Inline the RenderCallSite logic here so that we can additonally access the
// destructuring property.
bool location_computed = false;
bool is_destructuring = false;
MessageLocation location;
if (ComputeLocation(isolate, &location)) {
location_computed = true;
UnoptimizedCompileFlags flags = UnoptimizedCompileFlags::ForFunctionCompile(
isolate, *location.shared());
UnoptimizedCompileState compile_state(isolate);
ParseInfo info(isolate, flags, &compile_state);
if (parsing::ParseAny(&info, location.shared(), isolate,
parsing::ReportStatisticsMode::kNo)) {
info.ast_value_factory()->Internalize(isolate);
CallPrinter printer(isolate, location.shared()->IsUserJavaScript());
Handle<String> str = printer.Print(info.literal(), location.start_pos());
int pos = -1;
is_destructuring = printer.destructuring_assignment() != nullptr;
if (is_destructuring) {
// If we don't have one yet, try to extract the property name from the
// destructuring property in the AST.
ObjectLiteralProperty* destructuring_prop =
printer.destructuring_prop();
if (maybe_property_name.is_null() && destructuring_prop != nullptr &&
destructuring_prop->key()->IsPropertyName()) {
maybe_property_name = destructuring_prop->key()
->AsLiteral()
->AsRawPropertyName()
->string();
// Change the message location to point at the property name.
pos = destructuring_prop->key()->position();
}
if (maybe_property_name.is_null()) {
// Change the message location to point at the destructured value.
pos = printer.destructuring_assignment()->value()->position();
}
// If we updated the pos to a valid pos, rewrite the location.
if (pos != -1) {
location = MessageLocation(location.script(), pos, pos + 1,
location.shared());
}
}
if (str->length() > 0) callsite = str;
}
}
if (callsite.is_null()) {
callsite = BuildDefaultCallSite(isolate, object);
}
Handle<JSObject> error;
Handle<String> property_name;
if (is_destructuring) {
if (maybe_property_name.ToHandle(&property_name)) {
error = isolate->factory()->NewTypeError(
MessageTemplate::kNonCoercibleWithProperty, property_name, callsite,
object);
} else {
error = isolate->factory()->NewTypeError(MessageTemplate::kNonCoercible,
callsite, object);
}
} else {
Handle<Object> key_handle;
if (!key.ToHandle(&key_handle)) {
key_handle = ReadOnlyRoots(isolate).undefined_value_handle();
}
if (*key_handle == ReadOnlyRoots(isolate).iterator_symbol()) {
error = NewIteratorError(isolate, object);
} else {
error = isolate->factory()->NewTypeError(
MessageTemplate::kNonObjectPropertyLoad, key_handle, object);
}
}
if (location_computed) {
isolate->ThrowAt(error, &location);
} else {
isolate->Throw(*error);
}
return ReadOnlyRoots(isolate).exception();
}
} // namespace internal
} // namespace v8