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node_errors.cc
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1036 lines (870 loc) · 28.3 KB
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#include <cerrno>
#include <cstdarg>
#include "debug_utils-inl.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "node_internals.h"
#include "node_process.h"
#include "node_report.h"
#include "node_v8_platform-inl.h"
#include "util-inl.h"
namespace node {
using errors::TryCatchScope;
using v8::Boolean;
using v8::Context;
using v8::Exception;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Int32;
using v8::Isolate;
using v8::Just;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Message;
using v8::Object;
using v8::ScriptOrigin;
using v8::StackFrame;
using v8::StackTrace;
using v8::String;
using v8::Undefined;
using v8::Value;
bool IsExceptionDecorated(Environment* env, Local<Value> er) {
if (!er.IsEmpty() && er->IsObject()) {
Local<Object> err_obj = er.As<Object>();
auto maybe_value =
err_obj->GetPrivate(env->context(), env->decorated_private_symbol());
Local<Value> decorated;
return maybe_value.ToLocal(&decorated) && decorated->IsTrue();
}
return false;
}
namespace per_process {
static Mutex tty_mutex;
} // namespace per_process
static std::string GetErrorSource(Isolate* isolate,
Local<Context> context,
Local<Message> message,
bool* added_exception_line) {
MaybeLocal<String> source_line_maybe = message->GetSourceLine(context);
node::Utf8Value encoded_source(isolate, source_line_maybe.ToLocalChecked());
std::string sourceline(*encoded_source, encoded_source.length());
*added_exception_line = false;
// If source maps have been enabled, the exception line will instead be
// added in the JavaScript context:
Environment* env = Environment::GetCurrent(isolate);
const bool has_source_map_url =
!message->GetScriptOrigin().SourceMapUrl().IsEmpty();
if (has_source_map_url && env != nullptr && env->source_maps_enabled()) {
return sourceline;
}
if (sourceline.find("node-do-not-add-exception-line") != std::string::npos) {
return sourceline;
}
// Because of how node modules work, all scripts are wrapped with a
// "function (module, exports, __filename, ...) {"
// to provide script local variables.
//
// When reporting errors on the first line of a script, this wrapper
// function is leaked to the user. There used to be a hack here to
// truncate off the first 62 characters, but it caused numerous other
// problems when vm.runIn*Context() methods were used for non-module
// code.
//
// If we ever decide to re-instate such a hack, the following steps
// must be taken:
//
// 1. Pass a flag around to say "this code was wrapped"
// 2. Update the stack frame output so that it is also correct.
//
// It would probably be simpler to add a line rather than add some
// number of characters to the first line, since V8 truncates the
// sourceline to 78 characters, and we end up not providing very much
// useful debugging info to the user if we remove 62 characters.
// Print (filename):(line number): (message).
ScriptOrigin origin = message->GetScriptOrigin();
node::Utf8Value filename(isolate, message->GetScriptResourceName());
const char* filename_string = *filename;
int linenum = message->GetLineNumber(context).FromJust();
int script_start = (linenum - origin.ResourceLineOffset()->Value()) == 1
? origin.ResourceColumnOffset()->Value()
: 0;
int start = message->GetStartColumn(context).FromMaybe(0);
int end = message->GetEndColumn(context).FromMaybe(0);
if (start >= script_start) {
CHECK_GE(end, start);
start -= script_start;
end -= script_start;
}
std::string buf = SPrintF("%s:%i\n%s\n",
filename_string,
linenum,
sourceline.c_str());
CHECK_GT(buf.size(), 0);
*added_exception_line = true;
if (start > end ||
start < 0 ||
static_cast<size_t>(end) > sourceline.size()) {
return buf;
}
constexpr int kUnderlineBufsize = 1020;
char underline_buf[kUnderlineBufsize + 4];
int off = 0;
// Print wavy underline (GetUnderline is deprecated).
for (int i = 0; i < start; i++) {
if (sourceline[i] == '\0' || off >= kUnderlineBufsize) {
break;
}
CHECK_LT(off, kUnderlineBufsize);
underline_buf[off++] = (sourceline[i] == '\t') ? '\t' : ' ';
}
for (int i = start; i < end; i++) {
if (sourceline[i] == '\0' || off >= kUnderlineBufsize) {
break;
}
CHECK_LT(off, kUnderlineBufsize);
underline_buf[off++] = '^';
}
CHECK_LE(off, kUnderlineBufsize);
underline_buf[off++] = '\n';
return buf + std::string(underline_buf, off);
}
void PrintStackTrace(Isolate* isolate, Local<StackTrace> stack) {
for (int i = 0; i < stack->GetFrameCount(); i++) {
Local<StackFrame> stack_frame = stack->GetFrame(isolate, i);
node::Utf8Value fn_name_s(isolate, stack_frame->GetFunctionName());
node::Utf8Value script_name(isolate, stack_frame->GetScriptName());
const int line_number = stack_frame->GetLineNumber();
const int column = stack_frame->GetColumn();
if (stack_frame->IsEval()) {
if (stack_frame->GetScriptId() == Message::kNoScriptIdInfo) {
FPrintF(stderr, " at [eval]:%i:%i\n", line_number, column);
} else {
FPrintF(stderr,
" at [eval] (%s:%i:%i)\n",
*script_name,
line_number,
column);
}
break;
}
if (fn_name_s.length() == 0) {
FPrintF(stderr, " at %s:%i:%i\n", script_name, line_number, column);
} else {
FPrintF(stderr,
" at %s (%s:%i:%i)\n",
fn_name_s,
script_name,
line_number,
column);
}
}
fflush(stderr);
}
void PrintException(Isolate* isolate,
Local<Context> context,
Local<Value> err,
Local<Message> message) {
node::Utf8Value reason(isolate,
err->ToDetailString(context)
.FromMaybe(Local<String>()));
bool added_exception_line = false;
std::string source =
GetErrorSource(isolate, context, message, &added_exception_line);
FPrintF(stderr, "%s\n", source);
FPrintF(stderr, "%s\n", reason);
Local<v8::StackTrace> stack = message->GetStackTrace();
if (!stack.IsEmpty()) PrintStackTrace(isolate, stack);
}
void PrintCaughtException(Isolate* isolate,
Local<Context> context,
const v8::TryCatch& try_catch) {
CHECK(try_catch.HasCaught());
PrintException(isolate, context, try_catch.Exception(), try_catch.Message());
}
void AppendExceptionLine(Environment* env,
Local<Value> er,
Local<Message> message,
enum ErrorHandlingMode mode) {
if (message.IsEmpty()) return;
HandleScope scope(env->isolate());
Local<Object> err_obj;
if (!er.IsEmpty() && er->IsObject()) {
err_obj = er.As<Object>();
}
bool added_exception_line = false;
std::string source = GetErrorSource(
env->isolate(), env->context(), message, &added_exception_line);
if (!added_exception_line) {
return;
}
MaybeLocal<Value> arrow_str = ToV8Value(env->context(), source);
const bool can_set_arrow = !arrow_str.IsEmpty() && !err_obj.IsEmpty();
// If allocating arrow_str failed, print it out. There's not much else to do.
// If it's not an error, but something needs to be printed out because
// it's a fatal exception, also print it out from here.
// Otherwise, the arrow property will be attached to the object and handled
// by the caller.
if (!can_set_arrow || (mode == FATAL_ERROR && !err_obj->IsNativeError())) {
if (env->printed_error()) return;
Mutex::ScopedLock lock(per_process::tty_mutex);
env->set_printed_error(true);
ResetStdio();
FPrintF(stderr, "\n%s", source);
return;
}
CHECK(err_obj
->SetPrivate(env->context(),
env->arrow_message_private_symbol(),
arrow_str.ToLocalChecked())
.FromMaybe(false));
}
[[noreturn]] void Abort() {
DumpBacktrace(stderr);
fflush(stderr);
ABORT_NO_BACKTRACE();
}
[[noreturn]] void Assert(const AssertionInfo& info) {
std::string name = GetHumanReadableProcessName();
fprintf(stderr,
"%s: %s:%s%s Assertion `%s' failed.\n",
name.c_str(),
info.file_line,
info.function,
*info.function ? ":" : "",
info.message);
fflush(stderr);
Abort();
}
enum class EnhanceFatalException { kEnhance, kDontEnhance };
/**
* Report the exception to the inspector, then print it to stderr.
* This should only be used when the Node.js instance is about to exit
* (i.e. this should be followed by a env->Exit() or an Abort()).
*
* Use enhance_stack = EnhanceFatalException::kDontEnhance
* when it's unsafe to call into JavaScript.
*/
static void ReportFatalException(Environment* env,
Local<Value> error,
Local<Message> message,
EnhanceFatalException enhance_stack) {
if (!env->can_call_into_js())
enhance_stack = EnhanceFatalException::kDontEnhance;
Isolate* isolate = env->isolate();
CHECK(!error.IsEmpty());
CHECK(!message.IsEmpty());
HandleScope scope(isolate);
AppendExceptionLine(env, error, message, FATAL_ERROR);
auto report_to_inspector = [&]() {
#if HAVE_INSPECTOR
env->inspector_agent()->ReportUncaughtException(error, message);
#endif
};
Local<Value> arrow;
Local<Value> stack_trace;
bool decorated = IsExceptionDecorated(env, error);
if (!error->IsObject()) { // We can only enhance actual errors.
report_to_inspector();
stack_trace = Undefined(isolate);
// If error is not an object, AppendExceptionLine() has already print the
// source line and the arrow to stderr.
// TODO(joyeecheung): move that side effect out of AppendExceptionLine().
// It is done just to preserve the source line as soon as possible.
} else {
Local<Object> err_obj = error.As<Object>();
auto enhance_with = [&](Local<Function> enhancer) {
Local<Value> enhanced;
Local<Value> argv[] = {err_obj};
if (!enhancer.IsEmpty() &&
enhancer
->Call(env->context(), Undefined(isolate), arraysize(argv), argv)
.ToLocal(&enhanced)) {
stack_trace = enhanced;
}
};
switch (enhance_stack) {
case EnhanceFatalException::kEnhance: {
enhance_with(env->enhance_fatal_stack_before_inspector());
report_to_inspector();
enhance_with(env->enhance_fatal_stack_after_inspector());
break;
}
case EnhanceFatalException::kDontEnhance: {
USE(err_obj->Get(env->context(), env->stack_string())
.ToLocal(&stack_trace));
report_to_inspector();
break;
}
default:
UNREACHABLE();
}
arrow =
err_obj->GetPrivate(env->context(), env->arrow_message_private_symbol())
.ToLocalChecked();
}
node::Utf8Value trace(env->isolate(), stack_trace);
// range errors have a trace member set to undefined
if (trace.length() > 0 && !stack_trace->IsUndefined()) {
if (arrow.IsEmpty() || !arrow->IsString() || decorated) {
FPrintF(stderr, "%s\n", trace);
} else {
node::Utf8Value arrow_string(env->isolate(), arrow);
FPrintF(stderr, "%s\n%s\n", arrow_string, trace);
}
} else {
// this really only happens for RangeErrors, since they're the only
// kind that won't have all this info in the trace, or when non-Error
// objects are thrown manually.
MaybeLocal<Value> message;
MaybeLocal<Value> name;
if (error->IsObject()) {
Local<Object> err_obj = error.As<Object>();
message = err_obj->Get(env->context(), env->message_string());
name = err_obj->Get(env->context(), env->name_string());
}
if (message.IsEmpty() || message.ToLocalChecked()->IsUndefined() ||
name.IsEmpty() || name.ToLocalChecked()->IsUndefined()) {
// Not an error object. Just print as-is.
node::Utf8Value message(env->isolate(), error);
FPrintF(stderr, "%s\n",
*message ? message.ToString() : "<toString() threw exception>");
} else {
node::Utf8Value name_string(env->isolate(), name.ToLocalChecked());
node::Utf8Value message_string(env->isolate(), message.ToLocalChecked());
if (arrow.IsEmpty() || !arrow->IsString() || decorated) {
FPrintF(stderr, "%s: %s\n", name_string, message_string);
} else {
node::Utf8Value arrow_string(env->isolate(), arrow);
FPrintF(stderr,
"%s\n%s: %s\n", arrow_string, name_string, message_string);
}
}
if (!env->options()->trace_uncaught) {
std::string argv0;
if (!env->argv().empty()) argv0 = env->argv()[0];
if (argv0.empty()) argv0 = "node";
FPrintF(stderr,
"(Use `%s --trace-uncaught ...` to show where the exception "
"was thrown)\n",
fs::Basename(argv0, ".exe"));
}
}
if (env->options()->trace_uncaught) {
Local<StackTrace> trace = message->GetStackTrace();
if (!trace.IsEmpty()) {
FPrintF(stderr, "Thrown at:\n");
PrintStackTrace(env->isolate(), trace);
}
}
fflush(stderr);
}
[[noreturn]] void FatalError(const char* location, const char* message) {
OnFatalError(location, message);
// to suppress compiler warning
ABORT();
}
void OnFatalError(const char* location, const char* message) {
if (location) {
FPrintF(stderr, "FATAL ERROR: %s %s\n", location, message);
} else {
FPrintF(stderr, "FATAL ERROR: %s\n", message);
}
Isolate* isolate = Isolate::GetCurrent();
Environment* env = Environment::GetCurrent(isolate);
bool report_on_fatalerror;
{
Mutex::ScopedLock lock(node::per_process::cli_options_mutex);
report_on_fatalerror = per_process::cli_options->report_on_fatalerror;
}
if (report_on_fatalerror) {
report::TriggerNodeReport(
isolate, env, message, "FatalError", "", Local<Object>());
}
fflush(stderr);
ABORT();
}
namespace errors {
TryCatchScope::~TryCatchScope() {
if (HasCaught() && !HasTerminated() && mode_ == CatchMode::kFatal) {
HandleScope scope(env_->isolate());
Local<v8::Value> exception = Exception();
Local<v8::Message> message = Message();
EnhanceFatalException enhance = CanContinue() ?
EnhanceFatalException::kEnhance : EnhanceFatalException::kDontEnhance;
if (message.IsEmpty())
message = Exception::CreateMessage(env_->isolate(), exception);
ReportFatalException(env_, exception, message, enhance);
env_->Exit(7);
}
}
const char* errno_string(int errorno) {
#define ERRNO_CASE(e) \
case e: \
return #e;
switch (errorno) {
#ifdef EACCES
ERRNO_CASE(EACCES);
#endif
#ifdef EADDRINUSE
ERRNO_CASE(EADDRINUSE);
#endif
#ifdef EADDRNOTAVAIL
ERRNO_CASE(EADDRNOTAVAIL);
#endif
#ifdef EAFNOSUPPORT
ERRNO_CASE(EAFNOSUPPORT);
#endif
#ifdef EAGAIN
ERRNO_CASE(EAGAIN);
#endif
#ifdef EWOULDBLOCK
#if EAGAIN != EWOULDBLOCK
ERRNO_CASE(EWOULDBLOCK);
#endif
#endif
#ifdef EALREADY
ERRNO_CASE(EALREADY);
#endif
#ifdef EBADF
ERRNO_CASE(EBADF);
#endif
#ifdef EBADMSG
ERRNO_CASE(EBADMSG);
#endif
#ifdef EBUSY
ERRNO_CASE(EBUSY);
#endif
#ifdef ECANCELED
ERRNO_CASE(ECANCELED);
#endif
#ifdef ECHILD
ERRNO_CASE(ECHILD);
#endif
#ifdef ECONNABORTED
ERRNO_CASE(ECONNABORTED);
#endif
#ifdef ECONNREFUSED
ERRNO_CASE(ECONNREFUSED);
#endif
#ifdef ECONNRESET
ERRNO_CASE(ECONNRESET);
#endif
#ifdef EDEADLK
ERRNO_CASE(EDEADLK);
#endif
#ifdef EDESTADDRREQ
ERRNO_CASE(EDESTADDRREQ);
#endif
#ifdef EDOM
ERRNO_CASE(EDOM);
#endif
#ifdef EDQUOT
ERRNO_CASE(EDQUOT);
#endif
#ifdef EEXIST
ERRNO_CASE(EEXIST);
#endif
#ifdef EFAULT
ERRNO_CASE(EFAULT);
#endif
#ifdef EFBIG
ERRNO_CASE(EFBIG);
#endif
#ifdef EHOSTUNREACH
ERRNO_CASE(EHOSTUNREACH);
#endif
#ifdef EIDRM
ERRNO_CASE(EIDRM);
#endif
#ifdef EILSEQ
ERRNO_CASE(EILSEQ);
#endif
#ifdef EINPROGRESS
ERRNO_CASE(EINPROGRESS);
#endif
#ifdef EINTR
ERRNO_CASE(EINTR);
#endif
#ifdef EINVAL
ERRNO_CASE(EINVAL);
#endif
#ifdef EIO
ERRNO_CASE(EIO);
#endif
#ifdef EISCONN
ERRNO_CASE(EISCONN);
#endif
#ifdef EISDIR
ERRNO_CASE(EISDIR);
#endif
#ifdef ELOOP
ERRNO_CASE(ELOOP);
#endif
#ifdef EMFILE
ERRNO_CASE(EMFILE);
#endif
#ifdef EMLINK
ERRNO_CASE(EMLINK);
#endif
#ifdef EMSGSIZE
ERRNO_CASE(EMSGSIZE);
#endif
#ifdef EMULTIHOP
ERRNO_CASE(EMULTIHOP);
#endif
#ifdef ENAMETOOLONG
ERRNO_CASE(ENAMETOOLONG);
#endif
#ifdef ENETDOWN
ERRNO_CASE(ENETDOWN);
#endif
#ifdef ENETRESET
ERRNO_CASE(ENETRESET);
#endif
#ifdef ENETUNREACH
ERRNO_CASE(ENETUNREACH);
#endif
#ifdef ENFILE
ERRNO_CASE(ENFILE);
#endif
#ifdef ENOBUFS
ERRNO_CASE(ENOBUFS);
#endif
#ifdef ENODATA
ERRNO_CASE(ENODATA);
#endif
#ifdef ENODEV
ERRNO_CASE(ENODEV);
#endif
#ifdef ENOENT
ERRNO_CASE(ENOENT);
#endif
#ifdef ENOEXEC
ERRNO_CASE(ENOEXEC);
#endif
#ifdef ENOLINK
ERRNO_CASE(ENOLINK);
#endif
#ifdef ENOLCK
#if ENOLINK != ENOLCK
ERRNO_CASE(ENOLCK);
#endif
#endif
#ifdef ENOMEM
ERRNO_CASE(ENOMEM);
#endif
#ifdef ENOMSG
ERRNO_CASE(ENOMSG);
#endif
#ifdef ENOPROTOOPT
ERRNO_CASE(ENOPROTOOPT);
#endif
#ifdef ENOSPC
ERRNO_CASE(ENOSPC);
#endif
#ifdef ENOSR
ERRNO_CASE(ENOSR);
#endif
#ifdef ENOSTR
ERRNO_CASE(ENOSTR);
#endif
#ifdef ENOSYS
ERRNO_CASE(ENOSYS);
#endif
#ifdef ENOTCONN
ERRNO_CASE(ENOTCONN);
#endif
#ifdef ENOTDIR
ERRNO_CASE(ENOTDIR);
#endif
#ifdef ENOTEMPTY
#if ENOTEMPTY != EEXIST
ERRNO_CASE(ENOTEMPTY);
#endif
#endif
#ifdef ENOTSOCK
ERRNO_CASE(ENOTSOCK);
#endif
#ifdef ENOTSUP
ERRNO_CASE(ENOTSUP);
#else
#ifdef EOPNOTSUPP
ERRNO_CASE(EOPNOTSUPP);
#endif
#endif
#ifdef ENOTTY
ERRNO_CASE(ENOTTY);
#endif
#ifdef ENXIO
ERRNO_CASE(ENXIO);
#endif
#ifdef EOVERFLOW
ERRNO_CASE(EOVERFLOW);
#endif
#ifdef EPERM
ERRNO_CASE(EPERM);
#endif
#ifdef EPIPE
ERRNO_CASE(EPIPE);
#endif
#ifdef EPROTO
ERRNO_CASE(EPROTO);
#endif
#ifdef EPROTONOSUPPORT
ERRNO_CASE(EPROTONOSUPPORT);
#endif
#ifdef EPROTOTYPE
ERRNO_CASE(EPROTOTYPE);
#endif
#ifdef ERANGE
ERRNO_CASE(ERANGE);
#endif
#ifdef EROFS
ERRNO_CASE(EROFS);
#endif
#ifdef ESPIPE
ERRNO_CASE(ESPIPE);
#endif
#ifdef ESRCH
ERRNO_CASE(ESRCH);
#endif
#ifdef ESTALE
ERRNO_CASE(ESTALE);
#endif
#ifdef ETIME
ERRNO_CASE(ETIME);
#endif
#ifdef ETIMEDOUT
ERRNO_CASE(ETIMEDOUT);
#endif
#ifdef ETXTBSY
ERRNO_CASE(ETXTBSY);
#endif
#ifdef EXDEV
ERRNO_CASE(EXDEV);
#endif
default:
return "";
}
}
void PerIsolateMessageListener(Local<Message> message, Local<Value> error) {
Isolate* isolate = message->GetIsolate();
switch (message->ErrorLevel()) {
case Isolate::MessageErrorLevel::kMessageWarning: {
Environment* env = Environment::GetCurrent(isolate);
if (!env) {
break;
}
Utf8Value filename(isolate, message->GetScriptOrigin().ResourceName());
// (filename):(line) (message)
std::stringstream warning;
warning << *filename;
warning << ":";
warning << message->GetLineNumber(env->context()).FromMaybe(-1);
warning << " ";
v8::String::Utf8Value msg(isolate, message->Get());
warning << *msg;
USE(ProcessEmitWarningGeneric(env, warning.str().c_str(), "V8"));
break;
}
case Isolate::MessageErrorLevel::kMessageError:
TriggerUncaughtException(isolate, error, message);
break;
}
}
void SetPrepareStackTraceCallback(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args[0]->IsFunction());
env->set_prepare_stack_trace_callback(args[0].As<Function>());
}
static void EnableSourceMaps(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
env->set_source_maps_enabled(true);
}
static void SetEnhanceStackForFatalException(
const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args[0]->IsFunction());
CHECK(args[1]->IsFunction());
env->set_enhance_fatal_stack_before_inspector(args[0].As<Function>());
env->set_enhance_fatal_stack_after_inspector(args[1].As<Function>());
}
// Side effect-free stringification that will never throw exceptions.
static void NoSideEffectsToString(const FunctionCallbackInfo<Value>& args) {
Local<Context> context = args.GetIsolate()->GetCurrentContext();
Local<String> detail_string;
if (args[0]->ToDetailString(context).ToLocal(&detail_string))
args.GetReturnValue().Set(detail_string);
}
static void TriggerUncaughtException(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
Environment* env = Environment::GetCurrent(isolate);
Local<Value> exception = args[0];
Local<Message> message = Exception::CreateMessage(isolate, exception);
if (env != nullptr && env->abort_on_uncaught_exception()) {
ReportFatalException(
env, exception, message, EnhanceFatalException::kEnhance);
Abort();
}
bool from_promise = args[1]->IsTrue();
errors::TriggerUncaughtException(isolate, exception, message, from_promise);
}
void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
registry->Register(SetPrepareStackTraceCallback);
registry->Register(EnableSource
47C5
Maps);
registry->Register(SetEnhanceStackForFatalException);
registry->Register(NoSideEffectsToString);
registry->Register(TriggerUncaughtException);
}
void Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
env->SetMethod(
target, "setPrepareStackTraceCallback", SetPrepareStackTraceCallback);
env->SetMethod(target, "enableSourceMaps", EnableSourceMaps);
env->SetMethod(target,
"setEnhanceStackForFatalException",
SetEnhanceStackForFatalException);
env->SetMethodNoSideEffect(
target, "noSideEffectsToString", NoSideEffectsToString);
env->SetMethod(target, "triggerUncaughtException", TriggerUncaughtException);
}
void DecorateErrorStack(Environment* env,
const errors::TryCatchScope& try_catch) {
Local<Value> exception = try_catch.Exception();
if (!exception->IsObject()) return;
Local<Object> err_obj = exception.As<Object>();
if (IsExceptionDecorated(env, err_obj)) return;
AppendExceptionLine(env, exception, try_catch.Message(), CONTEXTIFY_ERROR);
TryCatchScope try_catch_scope(env); // Ignore exceptions below.
MaybeLocal<Value> stack = err_obj->Get(env->context(), env->stack_string());
MaybeLocal<Value> maybe_value =
err_obj->GetPrivate(env->context(), env->arrow_message_private_symbol());
Local<Value> arrow;
if (!(maybe_value.ToLocal(&arrow) && arrow->IsString())) {
return;
}
if (stack.IsEmpty() || !stack.ToLocalChecked()->IsString()) {
return;
}
Local<String> decorated_stack = String::Concat(
env->isolate(),
String::Concat(env->isolate(),
arrow.As<String>(),
FIXED_ONE_BYTE_STRING(env->isolate(), "\n")),
stack.ToLocalChecked().As<String>());
USE(err_obj->Set(env->context(), env->stack_string(), decorated_stack));
err_obj->SetPrivate(
env->context(), env->decorated_private_symbol(), True(env->isolate()));
}
void TriggerUncaughtException(Isolate* isolate,
Local<Value> error,
Local<Message> message,
bool from_promise) {
CHECK(!error.IsEmpty());
HandleScope scope(isolate);
if (message.IsEmpty()) message = Exception::CreateMessage(isolate, error);
CHECK(isolate->InContext());
Local<Context> context = isolate->GetCurrentContext();
Environment* env = Environment::GetCurrent(context);
7A1D
if (env == nullptr) {
// This means that the exception happens before Environment is assigned
// to the context e.g. when there is a SyntaxError in a per-context
// script - which usually indicates that there is a bug because no JS
// error is supposed to be thrown at this point.
// Since we don't have access to Environment here, there is not
// much we can do, so we just print whatever is useful and crash.
PrintException(isolate, context, error, message);
Abort();
}
// Invoke process._fatalException() to give user a chance to handle it.
// We have to grab it from the process object since this has been
// monkey-patchable.
Local<Object> process_object = env->process_object();
Local<String> fatal_exception_string = env->fatal_exception_string();
Local<Value> fatal_exception_function =
process_object->Get(env->context(),
fatal_exception_string).ToLocalChecked();
// If the exception happens before process._fatalException is attached
// during bootstrap, or if the user has patched it incorrectly, exit
// the current Node.js instance.
if (!fatal_exception_function->IsFunction()) {
ReportFatalException(
env, error, message, EnhanceFatalException::kDontEnhance);
env->Exit(6);
return;
}
MaybeLocal<Value> maybe_handled;
if (env->can_call_into_js()) {
// We do not expect the global uncaught exception itself to throw any more
// exceptions. If it does, exit the current Node.js instance.
errors::TryCatchScope try_catch(env,
errors::TryCatchScope::CatchMode::kFatal);
// Explicitly disable verbose exception reporting -
// if process._fatalException() throws an error, we don't want it to
// trigger the per-isolate message listener which will call this
// function and recurse.
try_catch.SetVerbose(false);
Local<Value> argv[2] = { error,
Boolean::New(env->isolate(), from_promise) };
maybe_handled = fatal_exception_function.As<Function>()->Call(
env->context(), process_object, arraysize(argv), argv);
}
// If process._fatalException() throws, we are now exiting the Node.js
// instance so return to continue the exit routine.
// TODO(joyeecheung): return a Maybe here to prevent the caller from
// stepping on the exit.
Local<Value> handled;
if (!maybe_handled.ToLocal(&handled)) {
return;
}
// The global uncaught exception handler returns true if the user handles it
// by e.g. listening to `uncaughtException`. In that case, continue program
// execution.
// TODO(joyeecheung): This has been only checking that the return value is
// exactly false. Investigate whether this can be turned to an "if true"
// similar to how the worker global uncaught exception handler handles it.
if (!handled->IsFalse()) {
return;
}
// Now we are certain that the exception is fatal.
ReportFatalException(env, error, message, EnhanceFatalException::kEnhance);
RunAtExit(env);
// If the global uncaught exception handler sets process.exitCode,
// exit with that code. Otherwise, exit with 1.
Local<String> exit_code = env->exit_code_string();