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node.cc
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "node_buffer.h"
#include "node_constants.h"
#include "node_javascript.h"
#include "node_code_cache.h"
#include "node_platform.h"
#include "node_version.h"
#include "node_internals.h"
#include "node_revert.h"
#include "node_perf.h"
#include "node_context_data.h"
#include "tracing/traced_value.h"
#if defined HAVE_PERFCTR
#include "node_counters.h"
#endif
#if HAVE_OPENSSL
#include "node_crypto.h"
#endif
#if defined(NODE_HAVE_I18N_SUPPORT)
#include "node_i18n.h"
#endif
#if HAVE_INSPECTOR
#include "inspector_io.h"
#endif
#if defined HAVE_DTRACE || defined HAVE_ETW
#include "node_dtrace.h"
#endif
#include "ares.h"
#include "async_wrap-inl.h"
#include "env-inl.h"
#include "handle_wrap.h"
#include "http_parser.h"
#include "nghttp2/nghttp2ver.h"
#include "req_wrap-inl.h"
#include "string_bytes.h"
#include "tracing/agent.h"
#include "tracing/node_trace_writer.h"
#include "util.h"
#include "uv.h"
#if NODE_USE_V8_PLATFORM
#include "libplatform/libplatform.h"
#endif // NODE_USE_V8_PLATFORM
#include "v8-profiler.h"
#include "zlib.h"
#ifdef NODE_ENABLE_VTUNE_PROFILING
#include "../deps/v8/src/third_party/vtune/v8-vtune.h"
#endif
#include <errno.h>
#include <fcntl.h> // _O_RDWR
#include <limits.h> // PATH_MAX
#include <locale.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <string>
#include <vector>
#if defined(NODE_HAVE_I18N_SUPPORT)
#include <unicode/uvernum.h>
#endif
#if defined(LEAK_SANITIZER)
#include <sanitizer/lsan_interface.h>
#endif
#if defined(_MSC_VER)
#include <direct.h>
#include <io.h>
#define umask _umask
typedef int mode_t;
#else
#include <pthread.h>
#include <sys/resource.h> // getrlimit, setrlimit
#include <unistd.h> // setuid, getuid
#endif
#if defined(__POSIX__) && !defined(__ANDROID__) && !defined(__CloudABI__)
#include <pwd.h> // getpwnam()
#include <grp.h> // getgrnam()
#endif
#if defined(__POSIX__)
#include <dlfcn.h>
#endif
// This is used to load built-in modules. Instead of using
// __attribute__((constructor)), we call the _register_<modname>
// function for each built-in modules explicitly in
// node::RegisterBuiltinModules(). This is only forward declaration.
// The definitions are in each module's implementation when calling
// the NODE_BUILTIN_MODULE_CONTEXT_AWARE.
#define V(modname) void _register_##modname();
NODE_BUILTIN_MODULES(V)
#undef V
namespace node {
using options_parser::kAllowedInEnvironment;
using options_parser::kDisallowedInEnvironment;
using v8::Array;
using v8::ArrayBuffer;
using v8::Boolean;
using v8::Context;
using v8::DEFAULT;
using v8::DontEnum;
using v8::EscapableHandleScope;
using v8::Exception;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Int32;
using v8::Integer;
using v8::Isolate;
using v8::Just;
using v8::Local;
using v8::Locker;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Message;
using v8::MicrotasksPolicy;
using v8::Name;
using v8::NamedPropertyHandlerConfiguration;
using v8::NewStringType;
using v8::None;
using v8::Nothing;
using v8::Null;
using v8::Number;
using v8::Object;
using v8::ObjectTemplate;
using v8::Promise;
using v8::PropertyAttribute;
using v8::ReadOnly;
using v8::Script;
using v8::ScriptCompiler;
using v8::ScriptOrigin;
using v8::SealHandleScope;
using v8::SideEffectType;
using v8::String;
using v8::TracingController;
using v8::TryCatch;
using v8::Undefined;
using v8::V8;
using v8::Value;
static bool v8_is_profiling = false;
static bool node_is_initialized = false;
static uv_once_t init_modpending_once = UV_ONCE_INIT;
static uv_key_t thread_local_modpending;
static node_module* modlist_builtin;
static node_module* modlist_internal;
static node_module* modlist_linked;
static node_module* modlist_addon;
// TODO(addaleax): This should not be global.
static bool abort_on_uncaught_exception = false;
// Bit flag used to track security reverts (see node_revert.h)
unsigned int reverted = 0;
bool v8_initialized = false;
bool linux_at_secure = false;
// process-relative uptime base, initialized at start-up
double prog_start_time;
Mutex per_process_opts_mutex;
std::shared_ptr<PerProcessOptions> per_process_opts {
new PerProcessOptions() };
static Mutex node_isolate_mutex;
static Isolate* node_isolate;
// Ensures that __metadata trace events are only emitted
// when tracing is enabled.
class NodeTraceStateObserver :
public TracingController::TraceStateObserver {
public:
void OnTraceEnabled() override {
char name_buffer[512];
if (uv_get_process_title(name_buffer, sizeof(name_buffer)) == 0) {
// Only emit the metadata event if the title can be retrieved
// successfully. Ignore it otherwise.
TRACE_EVENT_METADATA1("__metadata", "process_name",
"name", TRACE_STR_COPY(name_buffer));
}
TRACE_EVENT_METADATA1("__metadata", "version",
"node", NODE_VERSION_STRING);
TRACE_EVENT_METADATA1("__metadata", "thread_name",
"name", "JavaScriptMainThread");
auto trace_process = tracing::TracedValue::Create();
trace_process->BeginDictionary("versions");
const char http_parser_version[] =
NODE_STRINGIFY(HTTP_PARSER_VERSION_MAJOR)
"."
NODE_STRINGIFY(HTTP_PARSER_VERSION_MINOR)
"."
NODE_STRINGIFY(HTTP_PARSER_VERSION_PATCH);
const char node_napi_version[] = NODE_STRINGIFY(NAPI_VERSION);
const char node_modules_version[] = NODE_STRINGIFY(NODE_MODULE_VERSION);
trace_process->SetString("http_parser", http_parser_version);
trace_process->SetString("node", NODE_VERSION_STRING);
trace_process->SetString("v8", V8::GetVersion());
trace_process->SetString("uv", uv_version_string());
trace_process->SetString("zlib", ZLIB_VERSION);
trace_process->SetString("ares", ARES_VERSION_STR);
trace_process->SetString("modules", node_modules_version);
trace_process->SetString("nghttp2", NGHTTP2_VERSION);
trace_process->SetString("napi", node_napi_version);
#if HAVE_OPENSSL
// Stupid code to slice out the version string.
{ // NOLINT(whitespace/braces)
size_t i, j, k;
int c;
for (i = j = 0, k = sizeof(OPENSSL_VERSION_TEXT) - 1; i < k; ++i) {
c = OPENSSL_VERSION_TEXT[i];
if ('0' <= c && c <= '9') {
for (j = i + 1; j < k; ++j) {
c = OPENSSL_VERSION_TEXT[j];
if (c == ' ')
break;
}
break;
}
}
trace_process->SetString("openssl",
std::string(&OPENSSL_VERSION_TEXT[i], j - i));
}
#endif
trace_process->EndDictionary();
trace_process->SetString("arch", NODE_ARCH);
trace_process->SetString("platform", NODE_PLATFORM);
trace_process->BeginDictionary("release");
trace_process->SetString("name", NODE_RELEASE);
#if NODE_VERSION_IS_LTS
trace_process->SetString("lts", NODE_VERSION_LTS_CODENAME);
#endif
trace_process->EndDictionary();
TRACE_EVENT_METADATA1("__metadata", "node",
"process", std::move(trace_process));
// This only runs the first time tracing is enabled
controller_->RemoveTraceStateObserver(this);
delete this;
}
void OnTraceDisabled() override {
// Do nothing here. This should never be called because the
// observer removes itself when OnTraceEnabled() is called.
UNREACHABLE();
}
explicit NodeTraceStateObserver(TracingController* controller) :
controller_(controller) {}
~NodeTraceStateObserver() override {}
private:
TracingController* controller_;
};
static struct {
#if NODE_USE_V8_PLATFORM
void Initialize(int thread_pool_size) {
tracing_agent_.reset(new tracing::Agent());
auto controller = tracing_agent_->GetTracingController();
controller->AddTraceStateObserver(new NodeTraceStateObserver(controller));
tracing::TraceEventHelper::SetTracingController(controller);
StartTracingAgent();
platform_ = new NodePlatform(thread_pool_size, controller);
V8::InitializePlatform(platform_);
}
void Dispose() {
tracing_agent_.reset(nullptr);
platform_->Shutdown();
delete platform_;
platform_ = nullptr;
}
void DrainVMTasks(Isolate* isolate) {
platform_->DrainTasks(isolate);
}
void CancelVMTasks(Isolate* isolate) {
platform_->CancelPendingDelayedTasks(isolate);
}
#if HAVE_INSPECTOR
bool StartInspector(Environment* env, const char* script_path,
std::shared_ptr<DebugOptions> options) {
// Inspector agent can't fail to start, but if it was configured to listen
// right away on the websocket port and fails to bind/etc, this will return
// false.
return env->inspector_agent()->Start(
script_path == nullptr ? "" : script_path, options);
}
bool InspectorStarted(Environment* env) {
return env->inspector_agent()->IsListening();
}
#endif // HAVE_INSPECTOR
void StartTracingAgent() {
if (per_process_opts->trace_event_categories.empty()) {
tracing_file_writer_ = tracing_agent_->DefaultHandle();
} else {
tracing_file_writer_ = tracing_agent_->AddClient(
ParseCommaSeparatedSet(per_process_opts->trace_event_categories),
std::unique_ptr<tracing::AsyncTraceWriter>(
new tracing::NodeTraceWriter(
per_process_opts->trace_event_file_pattern)),
tracing::Agent::kUseDefaultCategories);
}
}
void StopTracingAgent() {
tracing_file_writer_.reset();
}
tracing::AgentWriterHandle* GetTracingAgentWriter() {
return &tracing_file_writer_;
}
NodePlatform* Platform() {
return platform_;
}
std::unique_ptr<tracing::Agent> tracing_agent_;
tracing::AgentWriterHandle tracing_file_writer_;
NodePlatform* platform_;
#else // !NODE_USE_V8_PLATFORM
void Initialize(int thread_pool_size) {}
void Dispose() {}
void DrainVMTasks(Isolate* isolate) {}
void CancelVMTasks(Isolate* isolate) {}
bool StartInspector(Environment* env, const char* script_path,
const DebugOptions& options) {
env->ThrowError("Node compiled with NODE_USE_V8_PLATFORM=0");
return true;
}
void StartTracingAgent() {
if (!trace_enabled_categories.empty()) {
fprintf(stderr, "Node compiled with NODE_USE_V8_PLATFORM=0, "
"so event tracing is not available.\n");
}
}
void StopTracingAgent() {}
tracing::AgentWriterHandle* GetTracingAgentWriter() {
return nullptr;
}
NodePlatform* Platform() {
return nullptr;
}
#endif // !NODE_USE_V8_PLATFORM
#if !NODE_USE_V8_PLATFORM || !HAVE_INSPECTOR
bool InspectorStarted(Environment* env) {
return false;
}
#endif // !NODE_USE_V8_PLATFORM || !HAVE_INSPECTOR
} v8_platform;
#ifdef __POSIX__
static const unsigned kMaxSignal = 32;
#endif
void PrintErrorString(const char* format, ...) {
va_list ap;
va_start(ap, format);
#ifdef _WIN32
HANDLE stderr_handle = GetStdHandle(STD_ERROR_HANDLE);
// Check if stderr is something other than a tty/console
if (stderr_handle == INVALID_HANDLE_VALUE ||
stderr_handle == nullptr ||
uv_guess_handle(_fileno(stderr)) != UV_TTY) {
vfprintf(stderr, format, ap);
va_end(ap);
return;
}
// Fill in any placeholders
int n = _vscprintf(format, ap);
std::vector<char> out(n + 1);
vsprintf(out.data(), format, ap);
// Get required wide buffer size
n = MultiByteToWideChar(CP_UTF8, 0, out.data(), -1, nullptr, 0);
std::vector<wchar_t> wbuf(n);
MultiByteToWideChar(CP_UTF8, 0, out.data(), -1, wbuf.data(), n);
// Don't include the null character in the output
CHECK_GT(n, 0);
WriteConsoleW(stderr_handle, wbuf.data(), n - 1, nullptr, nullptr);
#else
vfprintf(stderr, format, ap);
#endif
va_end(ap);
}
const char* signo_string(int signo) {
#define SIGNO_CASE(e) case e: return #e;
switch (signo) {
#ifdef SIGHUP
SIGNO_CASE(SIGHUP);
#endif
#ifdef SIGINT
SIGNO_CASE(SIGINT);
#endif
#ifdef SIGQUIT
SIGNO_CASE(SIGQUIT);
#endif
#ifdef SIGILL
SIGNO_CASE(SIGILL);
#endif
#ifdef SIGTRAP
SIGNO_CASE(SIGTRAP);
#endif
#ifdef SIGABRT
SIGNO_CASE(SIGABRT);
#endif
#ifdef SIGIOT
# if SIGABRT != SIGIOT
SIGNO_CASE(SIGIOT);
# endif
#endif
#ifdef SIGBUS
SIGNO_CASE(SIGBUS);
#endif
#ifdef SIGFPE
SIGNO_CASE(SIGFPE);
#endif
#ifdef SIGKILL
SIGNO_CASE(SIGKILL);
#endif
#ifdef SIGUSR1
SIGNO_CASE(SIGUSR1);
#endif
#ifdef SIGSEGV
SIGNO_CASE(SIGSEGV);
#endif
#ifdef SIGUSR2
SIGNO_CASE(SIGUSR2);
#endif
#ifdef SIGPIPE
SIGNO_CASE(SIGPIPE);
#endif
#ifdef SIGALRM
SIGNO_CASE(SIGALRM);
#endif
SIGNO_CASE(SIGTERM);
#ifdef SIGCHLD
SIGNO_CASE(SIGCHLD);
#endif
#ifdef SIGSTKFLT
SIGNO_CASE(SIGSTKFLT);
#endif
#ifdef SIGCONT
SIGNO_CASE(SIGCONT);
#endif
#ifdef SIGSTOP
SIGNO_CASE(SIGSTOP);
#endif
#ifdef SIGTSTP
SIGNO_CASE(SIGTSTP);
#endif
#ifdef SIGBREAK
SIGNO_CASE(SIGBREAK);
#endif
#ifdef SIGTTIN
SIGNO_CASE(SIGTTIN);
#endif
#ifdef SIGTTOU
SIGNO_CASE(SIGTTOU);
#endif
#ifdef SIGURG
SIGNO_CASE(SIGURG);
#endif
#ifdef SIGXCPU
SIGNO_CASE(SIGXCPU);
#endif
#ifdef SIGXFSZ
SIGNO_CASE(SIGXFSZ);
#endif
#ifdef SIGVTALRM
SIGNO_CASE(SIGVTALRM);
#endif
#ifdef SIGPROF
SIGNO_CASE(SIGPROF);
#endif
#ifdef SIGWINCH
SIGNO_CASE(SIGWINCH);
#endif
#ifdef SIGIO
SIGNO_CASE(SIGIO);
#endif
#ifdef SIGPOLL
# if SIGPOLL != SIGIO
SIGNO_CASE(SIGPOLL);
# endif
#endif
#ifdef SIGLOST
# if SIGLOST != SIGABRT
SIGNO_CASE(SIGLOST);
# endif
#endif
#ifdef SIGPWR
# if SIGPWR != SIGLOST
SIGNO_CASE(SIGPWR);
# endif
#endif
#ifdef SIGINFO
# if !defined(SIGPWR) || SIGINFO != SIGPWR
SIGNO_CASE(SIGINFO);
# endif
#endif
#ifdef SIGSYS
SIGNO_CASE(SIGSYS);
#endif
default: return "";
}
}
// These are all flags available for use with NODE_OPTIONS.
//
// Disallowed flags:
// These flags cause Node to do things other than run scripts:
// --version / -v
// --eval / -e
// --print / -p
// --check / -c
// --interactive / -i
// --prof-process
// --v8-options
// These flags are disallowed because security:
// --preserve-symlinks
const char* const environment_flags[] = {
// Node options, sorted in `node --help` order for ease of comparison.
"--enable-fips",
"--experimental-modules",
"--experimenatl-repl-await",
"--experimental-vm-modules",
"--experimental-worker",
"--force-fips",
"--icu-data-dir",
"--inspect",
"--inspect-brk",
"--inspect-port",
"--loader",
"--napi-modules",
"--no-deprecation",
"--no-force-async-hooks-checks",
"--no-warnings",
"--openssl-config",
"--pending-deprecation",
"--redirect-warnings",
"--require",
"--throw-deprecation",
"--tls-cipher-list",
"--trace-deprecation",
"--trace-event-categories",
"--trace-event-file-pattern",
"--trace-events-enabled",
"--trace-sync-io",
"--trace-warnings",
"--track-heap-objects",
"--use-bundled-ca",
"--use-openssl-ca",
"--v8-pool-size",
"--zero-fill-buffers",
"-r"
};
// V8 options (define with '_', which allows '-' or '_')
const char* const v8_environment_flags[] = {
"--abort_on_uncaught_exception",
"--max_old_space_size",
"--perf_basic_prof",
"--perf_prof",
"--stack_trace_limit",
};
int v8_environment_flags_count = arraysize(v8_environment_flags);
int environment_flags_count = arraysize(environment_flags);
// Look up environment variable unless running as setuid root.
bool SafeGetenv(const char* key, std::string* text) {
#if !defined(__CloudABI__) && !defined(_WIN32)
if (linux_at_secure || getuid() != geteuid() || getgid() != getegid())
goto fail;
#endif
{
Mutex::ScopedLock lock(environ_mutex);
if (const char* value = getenv(key)) {
*text = value;
return true;
}
}
fail:
text->clear();
return false;
}
void* ArrayBufferAllocator::Allocate(size_t size) {
if (zero_fill_field_ || zero_fill_all_buffers)
return UncheckedCalloc(size);
else
return UncheckedMalloc(size);
}
namespace {
bool ShouldAbortOnUncaughtException(Isolate* isolate) {
HandleScope scope(isolate);
Environment* env = Environment::GetCurrent(isolate);
return env->should_abort_on_uncaught_toggle()[0] &&
!env->inside_should_not_abort_on_uncaught_scope();
}
} // anonymous namespace
void AddPromiseHook(Isolate* isolate, promise_hook_func fn, void* arg) {
Environment* env = Environment::GetCurrent(isolate);
env->AddPromiseHook(fn, arg);
}
void AddEnvironmentCleanupHook(Isolate* isolate,
void (*fun)(void* arg),
void* arg) {
Environment* env = Environment::GetCurrent(isolate);
env->AddCleanupHook(fun, arg);
}
void RemoveEnvironmentCleanupHook(Isolate* isolate,
void (*fun)(void* arg),
void* arg) {
Environment* env = Environment::GetCurrent(isolate);
env->RemoveCleanupHook(fun, arg);
}
MaybeLocal<Value> InternalMakeCallback(Environment* env,
Local<Object> recv,
const Local<Function> callback,
int argc,
Local<Value> argv[],
async_context asyncContext) {
CHECK(!recv.IsEmpty());
InternalCallbackScope scope(env, recv, asyncContext);
if (scope.Failed()) {
return MaybeLocal<Value>();
}
Local<Function> domain_cb = env->domain_callback();
MaybeLocal<Value> ret;
if (asyncContext.async_id != 0 || domain_cb.IsEmpty() || recv.IsEmpty()) {
ret = callback->Call(env->context(), recv, argc, argv);
} else {
std::vector<Local<Value>> args(1 + argc);
args[0] = callback;
std::copy(&argv[0], &argv[argc], args.begin() + 1);
ret = domain_cb->Call(env->context(), recv, args.size(), &args[0]);
}
if (ret.IsEmpty()) {
scope.MarkAsFailed();
return MaybeLocal<Value>();
}
scope.Close();
if (scope.Failed()) {
return MaybeLocal<Value>();
}
return ret;
}
// Public MakeCallback()s
MaybeLocal<Value> MakeCallback(Isolate* isolate,
Local<Object> recv,
const char* method,
int argc,
Local<Value> argv[],
async_context asyncContext) {
Local<String> method_string =
String::NewFromUtf8(isolate, method, NewStringType::kNormal)
.ToLocalChecked();
return MakeCallback(isolate, recv, method_string, argc, argv, asyncContext);
}
MaybeLocal<Value> MakeCallback(Isolate* isolate,
Local<Object> recv,
Local<String> symbol,
int argc,
Local<Value> argv[],
async_context asyncContext) {
Local<Value> callback_v = recv->Get(symbol);
if (callback_v.IsEmpty()) return Local<Value>();
if (!callback_v->IsFunction()) return Local<Value>();
Local<Function> callback = callback_v.As<Function>();
return MakeCallback(isolate, recv, callback, argc, argv, asyncContext);
}
MaybeLocal<Value> MakeCallback(Isolate* isolate,
Local<Object> recv,
Local<Function> callback,
int argc,
Local<Value> argv[],
async_context asyncContext) {
// Observe the following two subtleties:
//
// 1. The environment is retrieved from the callback function's context.
// 2. The context to enter is retrieved from the environment.
//
// Because of the AssignToContext() call in src/node_contextify.cc,
// the two contexts need not be the same.
Environment* env = Environment::GetCurrent(callback->CreationContext());
Context::Scope context_scope(env->context());
MaybeLocal<Value> ret = InternalMakeCallback(env, recv, callback,
argc, argv, asyncContext);
if (ret.IsEmpty() && env->makecallback_depth() == 0) {
// This is only for legacy compatiblity and we may want to look into
// removing/adjusting it.
return Undefined(env->isolate());
}
return ret;
}
// Legacy MakeCallback()s
Local<Value> MakeCallback(Isolate* isolate,
Local<Object> recv,
const char* method,
int argc,
Local<Value>* argv) {
EscapableHandleScope handle_scope(isolate);
return handle_scope.Escape(
MakeCallback(isolate, recv, method, argc, argv, {0, 0})
.FromMaybe(Local<Value>()));
}
Local<Value> MakeCallback(Isolate* isolate,
Local<Object> recv,
Local<String> symbol,
int argc,
Local<Value>* argv) {
EscapableHandleScope handle_scope(isolate);
return handle_scope.Escape(
MakeCallback(isolate, recv, symbol, argc, argv, {0, 0})
.FromMaybe(Local<Value>()));
}
Local<Value> MakeCallback(Isolate* isolate,
Local<Object> recv,
Local<Function> callback,
int argc,
Local<Value>* argv) {
EscapableHandleScope handle_scope(isolate);
return handle_scope.Escape(
MakeCallback(isolate, recv, callback, argc, argv, {0, 0})
.FromMaybe(Local<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;
}
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>();
}
// Print (filename):(line number): (message).
ScriptOrigin origin = message->GetScriptOrigin();
node::Utf8Value filename(env->isolate(), message->GetScriptResourceName());
const char* filename_string = *filename;
int linenum = message->GetLineNumber(env->context()).FromJust();
// Print line of source code.
MaybeLocal<String> source_line_maybe = message->GetSourceLine(env->context());
node::Utf8Value sourceline(env->isolate(),
source_line_maybe.ToLocalChecked());
const char* sourceline_string = *sourceline;
if (strstr(sourceline_string, "node-do-not-add-exception-line") != nullptr)
return;
// 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.
int script_start =
(linenum - origin.ResourceLineOffset()->Value()) == 1 ?
origin.ResourceColumnOffset()->Value() : 0;
int start = message->GetStartColumn(env->context()).FromMaybe(0);
int end = message->GetEndColumn(env->context()).FromMaybe(0);
if (start >= script_start) {
CHECK_GE(end, start);
start -= script_start;
end -= script_start;
}
char arrow[1024];
int max_off = sizeof(arrow) - 2;
int off = snprintf(arrow,
sizeof(arrow),
"%s:%i\n%s\n",
filename_string,
linenum,
sourceline_string);
CHECK_GE(off, 0);
if (off > max_off) {
off = max_off;
}
// Print wavy underline (GetUnderline is deprecated).
for (int i = 0; i < start; i++) {
if (sourceline_string[i] == '\0' || off >= max_off) {
break;
}
CHECK_LT(off, max_off);
arrow[off++] = (sourceline_string[i] == '\t') ? '\t' : ' ';
}
for (int i = start; i < end; i++) {
if (sourceline_string[i] == '\0' || off >= max_off) {
break;
}
CHECK_LT(off, max_off);
arrow[off++] = '^';
}
CHECK_LE(off, max_off);
arrow[off] = '\n';
arrow[off + 1] = '\0';
Local<String> arrow_str = String::NewFromUtf8(env->isolate(), arrow,
NewStringType::kNormal).ToLocalChecked();
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(process_mutex);
env->set_printed_error(true);
uv_tty_reset_mode();
PrintErrorString("\n%s", arrow);
return;
}
CHECK(err_obj->SetPrivate(
env->context(),
env->arrow_message_private_symbol(),
arrow_str).FromMaybe(false));
}
void ReportException(Environment* env,
Local<Value> er,
Local<Message> message) {
CHECK(!er.IsEmpty());
HandleScope scope(env->isolate());
if (message.IsEmpty())
message = Exception::CreateMessage(env->isolate(), er);
AppendExceptionLine(env, er, message, FATAL_ERROR);
Local<Value> trace_value;
Local<Value> arrow;
const bool decorated = IsExceptionDecorated(env, er);
if (er->IsUndefined() || er->IsNull()) {
trace_value = Undefined(env->isolate());