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v8/src/messages.cc
Jakob Gruber 91ec9872fb [error] Add use counters for non-standard Error features 
V8 provides non-standard Error API through:

Error.captureStackTrace
Error.prepareStackTrace
Error.stackTraceLimit

Let's add use counters to gauge how wide-spread these are used.

This is the V8 side of required changes.
The Chromium-side CL: https://crrev.com/c/753446

Bug: v8:6975
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I917cd6344a01670799f6cbf88a4bfff8e8d0d6ad
Reviewed-on: https://chromium-review.googlesource.com/753443
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49113}
2017-11-03 18:32:02 +00:00

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// 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/messages.h"
#include <memory>
#include "src/api.h"
#include "src/execution.h"
#include "src/isolate-inl.h"
#include "src/keys.h"
#include "src/objects/frame-array-inl.h"
#include "src/string-builder.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) {}
MessageLocation::MessageLocation(Handle<Script> script, int start_pos,
int end_pos, Handle<SharedFunctionInfo> shared)
: script_(script),
start_pos_(start_pos),
end_pos_(end_pos),
shared_(shared) {}
MessageLocation::MessageLocation() : start_pos_(-1), end_pos_(-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::Template message,
const MessageLocation* location, Handle<Object> argument,
Handle<FixedArray> stack_frames) {
Factory* factory = isolate->factory();
int start = -1;
int end = -1;
Handle<Object> script_handle = factory->undefined_value();
if (location != nullptr) {
start = location->start_pos();
end = location->end_pos();
script_handle = Script::GetWrapper(location->script());
} else {
script_handle = Script::GetWrapper(isolate->factory()->empty_script());
}
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, 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 = isolate->heap()->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)) {
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);
{
// 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 MessageTemplate::FormatMessage(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->eval_from_shared()->IsUndefined(isolate))
return isolate->heap()->undefined_value();
Handle<SharedFunctionInfo> shared(
SharedFunctionInfo::cast(script->eval_from_shared()));
// Find the name of the function calling eval.
if (shared->name()->BooleanValue()) {
return shared->name();
}
return shared->inferred_name();
}
Object* EvalFromScript(Isolate* isolate, Handle<Script> script) {
if (script->eval_from_shared()->IsUndefined(isolate))
return isolate->heap()->undefined_value();
Handle<SharedFunctionInfo> eval_from_shared(
SharedFunctionInfo::cast(script->eval_from_shared()));
return eval_from_shared->script()->IsScript()
? eval_from_shared->script()
: isolate->heap()->undefined_value();
}
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()) {
Handle<String> str;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, str, Object::ToString(isolate, eval_from_function_name),
String);
builder.AppendString(str);
} else {
builder.AppendCString("<anonymous>");
}
Handle<Object> eval_from_script_obj =
handle(EvalFromScript(isolate, script), isolate);
if (eval_from_script_obj->IsScript()) {
Handle<Script> eval_from_script =
Handle<Script>::cast(eval_from_script_obj);
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(),
&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<Object> StackFrameBase::GetEvalOrigin() {
if (!HasScript()) return isolate_->factory()->undefined_value();
return FormatEvalOrigin(isolate_, GetScript()).ToHandleChecked();
}
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();
const int flags = array->Flags(frame_ix)->value();
is_constructor_ = (flags & FrameArray::kIsConstructor) != 0;
is_strict_ = (flags & FrameArray::kIsStrict) != 0;
}
JSStackFrame::JSStackFrame() {}
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),
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<Object> JSStackFrame::GetFunctionName() {
Handle<String> result = JSFunction::GetName(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 iter =
LookupIterator::PropertyOrElement(isolate, receiver, name, 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<Object> 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_);
// ES2015 gives getters and setters name prefixes which must
// be stripped to find the property name.
if (name->IsUtf8EqualTo(CStrVector("get "), true) ||
name->IsUtf8EqualTo(CStrVector("set "), true)) {
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<Object> 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<Object> 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 -1;
}
int JSStackFrame::GetColumnNumber() {
DCHECK_LE(0, GetPosition());
if (HasScript()) {
return Script::GetColumnNumber(GetScript(), GetPosition()) + 1;
}
return -1;
}
bool JSStackFrame::IsNative() {
return HasScript() && GetScript()->type() == Script::TYPE_NATIVE;
}
bool JSStackFrame::IsToplevel() {
return receiver_->IsJSGlobalProxy() || receiver_->IsNullOrUndefined(isolate_);
}
namespace {
bool IsNonEmptyString(Handle<Object> object) {
return (object->IsString() && String::cast(*object)->length() > 0);
}
void AppendFileLocation(Isolate* isolate, StackFrameBase* call_site,
IncrementalStringBuilder* builder) {
if (call_site->IsNative()) {
builder->AppendCString("native");
return;
}
Handle<Object> file_name = call_site->GetScriptNameOrSourceUrl();
if (!file_name->IsString() && call_site->IsEval()) {
Handle<Object> eval_origin = call_site->GetEvalOrigin();
DCHECK(eval_origin->IsString());
builder->AppendString(Handle<String>::cast(eval_origin));
builder->AppendCString(", "); // Expecting source position to follow.
}
if (IsNonEmptyString(file_name)) {
builder->AppendString(Handle<String>::cast(file_name));
} else {
// Source code does not originate from a file and is not native, but we
// can still get the source position inside the source string, e.g. in
// an eval string.
builder->AppendCString("<anonymous>");
}
int line_number = call_site->GetLineNumber();
if (line_number != -1) {
builder->AppendCharacter(':');
Handle<String> line_string = isolate->factory()->NumberToString(
handle(Smi::FromInt(line_number), isolate), isolate);
builder->AppendString(line_string);
int column_number = call_site->GetColumnNumber();
if (column_number != -1) {
builder->AppendCharacter(':');
Handle<String> column_string = isolate->factory()->NumberToString(
handle(Smi::FromInt(column_number), isolate), isolate);
builder->AppendString(column_string);
}
}
}
int StringIndexOf(Isolate* isolate, Handle<String> subject,
Handle<String> pattern) {
if (pattern->length() > subject->length()) return -1;
return String::IndexOf(isolate, subject, pattern, 0);
}
// Returns true iff
// 1. the subject ends with '.' + pattern, or
// 2. subject == pattern.
bool StringEndsWithMethodName(Isolate* isolate, Handle<String> subject,
Handle<String> pattern) {
if (String::Equals(subject, pattern)) return true;
FlatStringReader subject_reader(isolate, String::Flatten(subject));
FlatStringReader pattern_reader(isolate, String::Flatten(pattern));
int pattern_index = pattern_reader.length() - 1;
int subject_index = subject_reader.length() - 1;
for (int i = 0; i <= pattern_reader.length(); i++) { // Iterate over len + 1.
if (subject_index < 0) {
return false;
}
const uc32 subject_char = subject_reader.Get(subject_index);
if (i == pattern_reader.length()) {
if (subject_char != '.') return false;
} else if (subject_char != pattern_reader.Get(pattern_index)) {
return false;
}
pattern_index--;
subject_index--;
}
return true;
}
void AppendMethodCall(Isolate* isolate, JSStackFrame* call_site,
IncrementalStringBuilder* builder) {
Handle<Object> type_name = call_site->GetTypeName();
Handle<Object> method_name = call_site->GetMethodName();
Handle<Object> function_name = call_site->GetFunctionName();
if (IsNonEmptyString(function_name)) {
Handle<String> function_string = Handle<String>::cast(function_name);
if (IsNonEmptyString(type_name)) {
Handle<String> type_string = Handle<String>::cast(type_name);
bool starts_with_type_name =
(StringIndexOf(isolate, function_string, type_string) == 0);
if (!starts_with_type_name) {
builder->AppendString(type_string);
builder->AppendCharacter('.');
}
}
builder->AppendString(function_string);
if (IsNonEmptyString(method_name)) {
Handle<String> method_string = Handle<String>::cast(method_name);
if (!StringEndsWithMethodName(isolate, function_string, method_string)) {
builder->AppendCString(" [as ");
builder->AppendString(method_string);
builder->AppendCharacter(']');
}
}
} else {
if (IsNonEmptyString(type_name)) {
builder->AppendString(Handle<String>::cast(type_name));
builder->AppendCharacter('.');
}
if (IsNonEmptyString(method_name)) {
builder->AppendString(Handle<String>::cast(method_name));
} else {
builder->AppendCString("<anonymous>");
}
}
}
} // namespace
MaybeHandle<String> JSStackFrame::ToString() {
IncrementalStringBuilder builder(isolate_);
Handle<Object> function_name = GetFunctionName();
const bool is_toplevel = IsToplevel();
const bool is_constructor = IsConstructor();
const bool is_method_call = !(is_toplevel || is_constructor);
if (is_method_call) {
AppendMethodCall(isolate_, this, &builder);
} else if (is_constructor) {
builder.AppendCString("new ");
if (IsNonEmptyString(function_name)) {
builder.AppendString(Handle<String>::cast(function_name));
} else {
builder.AppendCString("<anonymous>");
}
} else if (IsNonEmptyString(function_name)) {
builder.AppendString(Handle<String>::cast(function_name));
} else {
AppendFileLocation(isolate_, this, &builder);
return builder.Finish();
}
builder.AppendCString(" (");
AppendFileLocation(isolate_, this, &builder);
builder.AppendCString(")");
return builder.Finish();
}
int JSStackFrame::GetPosition() const { return code_->SourcePosition(offset_); }
bool JSStackFrame::HasScript() const {
return function_->shared()->script()->IsScript();
}
Handle<Script> JSStackFrame::GetScript() const {
return handle(Script::cast(function_->shared()->script()), isolate_);
}
WasmStackFrame::WasmStackFrame() {}
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->IsWasmInterpretedFrame(frame_ix) ||
array->IsAsmJsWasmFrame(frame_ix));
isolate_ = isolate;
wasm_instance_ = handle(array->WasmInstance(frame_ix), isolate);
wasm_func_index_ = array->WasmFunctionIndex(frame_ix)->value();
if (array->IsWasmInterpretedFrame(frame_ix)) {
code_ = Handle<AbstractCode>::null();
} else {
code_ = handle(array->Code(frame_ix), isolate);
}
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<Object> WasmStackFrame::GetFunctionName() {
Handle<Object> name;
Handle<WasmCompiledModule> compiled_module(wasm_instance_->compiled_module(),
isolate_);
if (!WasmCompiledModule::GetFunctionNameOrNull(isolate_, compiled_module,
wasm_func_index_)
.ToHandle(&name)) {
name = isolate_->factory()->null_value();
}
return name;
}
MaybeHandle<String> WasmStackFrame::ToString() {
IncrementalStringBuilder builder(isolate_);
Handle<WasmCompiledModule> compiled_module(wasm_instance_->compiled_module(),
isolate_);
MaybeHandle<String> module_name =
WasmCompiledModule::GetModuleNameOrNull(isolate_, compiled_module);
MaybeHandle<String> function_name = WasmCompiledModule::GetFunctionNameOrNull(
isolate_, compiled_module, wasm_func_index_);
bool has_name = !module_name.is_null() || !function_name.is_null();
if (has_name) {
if (module_name.is_null()) {
builder.AppendString(function_name.ToHandleChecked());
} else {
builder.AppendString(module_name.ToHandleChecked());
if (!function_name.is_null()) {
builder.AppendCString(".");
builder.AppendString(function_name.ToHandleChecked());
}
}
builder.AppendCString(" (");
}
builder.AppendCString("wasm-function[");
char buffer[16];
SNPrintF(ArrayVector(buffer), "%u]", wasm_func_index_);
builder.AppendCString(buffer);
SNPrintF(ArrayVector(buffer), ":%d", GetPosition());
builder.AppendCString(buffer);
if (has_name) builder.AppendCString(")");
return builder.Finish();
}
int WasmStackFrame::GetPosition() const {
return IsInterpreted() ? offset_ : code_->SourcePosition(offset_);
}
Handle<Object> WasmStackFrame::Null() const {
return isolate_->factory()->null_value();
}
bool WasmStackFrame::HasScript() const { return true; }
Handle<Script> WasmStackFrame::GetScript() const {
return handle(wasm_instance_->compiled_module()->script(), isolate_);
}
AsmJsWasmStackFrame::AsmJsWasmStackFrame() {}
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(clemensh): Return lazily created JSFunction.
return Null();
}
Handle<Object> AsmJsWasmStackFrame::GetFileName() {
Handle<Script> script(wasm_instance_->compiled_module()->script(), isolate_);
DCHECK(script->IsUserJavaScript());
return handle(script->name(), isolate_);
}
Handle<Object> AsmJsWasmStackFrame::GetScriptNameOrSourceUrl() {
Handle<Script> script(wasm_instance_->compiled_module()->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_->SourcePosition(offset_);
Handle<WasmCompiledModule> compiled_module(wasm_instance_->compiled_module(),
isolate_);
DCHECK_LE(0, byte_offset);
return WasmCompiledModule::GetSourcePosition(
compiled_module, wasm_func_index_, static_cast<uint32_t>(byte_offset),
is_at_number_conversion_);
}
int AsmJsWasmStackFrame::GetLineNumber() {
DCHECK_LE(0, GetPosition());
Handle<Script> script(wasm_instance_->compiled_module()->script(), isolate_);
DCHECK(script->IsUserJavaScript());
return Script::GetLineNumber(script, GetPosition()) + 1;
}
int AsmJsWasmStackFrame::GetColumnNumber() {
DCHECK_LE(0, GetPosition());
Handle<Script> script(wasm_instance_->compiled_module()->script(), isolate_);
DCHECK(script->IsUserJavaScript());
return Script::GetColumnNumber(script, GetPosition()) + 1;
}
MaybeHandle<String> AsmJsWasmStackFrame::ToString() {
// The string should look exactly as the respective javascript frame string.
// Keep this method in line to JSStackFrame::ToString().
IncrementalStringBuilder builder(isolate_);
Handle<Object> function_name = GetFunctionName();
if (IsNonEmptyString(function_name)) {
builder.AppendString(Handle<String>::cast(function_name));
builder.AppendCString(" (");
}
AppendFileLocation(isolate_, this, &builder);
if (IsNonEmptyString(function_name)) builder.AppendCString(")");
return builder.Finish();
}
FrameArrayIterator::FrameArrayIterator(Isolate* isolate,
Handle<FrameArray> array, int frame_ix)
: isolate_(isolate), array_(array), next_frame_ix_(frame_ix) {}
bool FrameArrayIterator::HasNext() const {
return (next_frame_ix_ < array_->FrameCount());
}
void FrameArrayIterator::Next() { next_frame_ix_++; }
StackFrameBase* FrameArrayIterator::Frame() {
DCHECK(HasNext());
const int flags = array_->Flags(next_frame_ix_)->value();
int flag_mask = FrameArray::kIsWasmFrame |
FrameArray::kIsWasmInterpretedFrame |
FrameArray::kIsAsmJsWasmFrame;
switch (flags & flag_mask) {
case 0:
// JavaScript Frame.
js_frame_.FromFrameArray(isolate_, array_, next_frame_ix_);
return &js_frame_;
case FrameArray::kIsWasmFrame:
case FrameArray::kIsWasmInterpretedFrame:
// Wasm Frame:
wasm_frame_.FromFrameArray(isolate_, array_, next_frame_ix_);
return &wasm_frame_;
case FrameArray::kIsAsmJsWasmFrame:
// Asm.js Wasm Frame:
asm_wasm_frame_.FromFrameArray(isolate_, array_, next_frame_ix_);
return &asm_wasm_frame_;
default:
UNREACHABLE();
}
}
namespace {
MaybeHandle<Object> ConstructCallSite(Isolate* isolate,
Handle<FrameArray> frame_array,
int frame_index) {
Handle<JSFunction> target =
handle(isolate->native_context()->callsite_function(), isolate);
Handle<JSObject> obj;
ASSIGN_RETURN_ON_EXCEPTION(isolate, obj, JSObject::New(target, target),
Object);
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<FrameArray> elems) {
const int frame_count = elems->FrameCount();
Handle<FixedArray> frames = isolate->factory()->NewFixedArray(frame_count);
for (int i = 0; i < frame_count; i++) {
Handle<Object> site;
ASSIGN_RETURN_ON_EXCEPTION(isolate, site,
ConstructCallSite(isolate, elems, i), 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->IsJSArray());
Handle<JSArray> raw_stack_array = Handle<JSArray>::cast(raw_stack);
DCHECK(raw_stack_array->elements()->IsFixedArray());
Handle<FrameArray> elems(FrameArray::cast(raw_stack_array->elements()));
// If there's a user-specified "prepareStackFrames" function, call it on the
// frames and use its result.
Handle<JSFunction> global_error = isolate->error_function();
Handle<Object> prepare_stack_trace;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, prepare_stack_trace,
JSFunction::GetProperty(isolate, global_error, "prepareStackTrace"),
Object);
const bool in_recursion = isolate->formatting_stack_trace();
if (prepare_stack_trace->IsJSFunction() && !in_recursion) {
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.start()),
Object);
return result;
}
// Otherwise, run our internal formatting logic.
IncrementalStringBuilder builder(isolate);
RETURN_ON_EXCEPTION(isolate, AppendErrorString(isolate, error, &builder),
Object);
for (FrameArrayIterator it(isolate, elems); it.HasNext(); it.Next()) {
builder.AppendCString("\n at ");
StackFrameBase* frame = it.Frame();
MaybeHandle<String> maybe_frame_string = frame->ToString();
if (maybe_frame_string.is_null()) {
// CallSite.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);
maybe_frame_string = ErrorUtils::ToString(isolate, pending_exception);
if (maybe_frame_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(maybe_frame_string.ToHandleChecked());
builder.AppendCString("<error>");
}
} else {
// CallSite.toString completed without throwing.
builder.AppendString(maybe_frame_string.ToHandleChecked());
}
}
return builder.Finish();
}
Handle<String> MessageTemplate::FormatMessage(Isolate* isolate,
int template_index,
Handle<Object> arg) {
Factory* factory = isolate->factory();
Handle<String> result_string = Object::NoSideEffectsToString(isolate, arg);
MaybeHandle<String> maybe_result_string = MessageTemplate::FormatMessage(
template_index, result_string, factory->empty_string(),
factory->empty_string());
if (!maybe_result_string.ToHandle(&result_string)) {
DCHECK(isolate->has_pending_exception());
isolate->clear_pending_exception();
return factory->InternalizeOneByteString(STATIC_CHAR_VECTOR("<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(result_string);
}
const char* MessageTemplate::TemplateString(int template_index) {
switch (template_index) {
#define CASE(NAME, STRING) \
case k##NAME: \
return STRING;
MESSAGE_TEMPLATES(CASE)
#undef CASE
case kLastMessage:
default:
return nullptr;
}
}
MaybeHandle<String> MessageTemplate::FormatMessage(int template_index,
Handle<String> arg0,
Handle<String> arg1,
Handle<String> arg2) {
Isolate* isolate = arg0->GetIsolate();
const char* template_string = TemplateString(template_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<Object> ErrorUtils::Construct(
Isolate* isolate, Handle<JSFunction> target, Handle<Object> new_target,
Handle<Object> message, FrameSkipMode mode, Handle<Object> caller,
bool suppress_detailed_trace) {
// 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), Object);
// 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), Object);
RETURN_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes(
err, isolate->factory()->message_string(),
msg_string, DONT_ENUM),
Object);
}
// Optionally capture a more detailed stack trace for the message.
if (!suppress_detailed_trace) {
RETURN_ON_EXCEPTION(isolate, isolate->CaptureAndSetDetailedStackTrace(err),
Object);
}
// Capture a simple stack trace for the stack property.
RETURN_ON_EXCEPTION(isolate,
isolate->CaptureAndSetSimpleStackTrace(err, mode, caller),
Object);
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(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> FormatMessage(Isolate* isolate, int template_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 (!MessageTemplate::FormatMessage(template_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
MaybeHandle<Object> ErrorUtils::MakeGenericError(
Isolate* isolate, Handle<JSFunction> constructor, int template_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 JSEntryStub
// clears
// any pending exceptions - so whenever we'd call this from C++, pending
// exceptions would be cleared. Preserve this behavior.
isolate->clear_pending_exception();
}
DCHECK(mode != SKIP_UNTIL_SEEN);
Handle<Object> no_caller;
Handle<String> msg = FormatMessage(isolate, template_index, arg0, arg1, arg2);
return ErrorUtils::Construct(isolate, constructor, constructor, msg, mode,
no_caller, false);
}
} // namespace internal
} // namespace v8
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