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src: move per-process global variables into node::per_process

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So that it's easier to tell whether we are manipulating per-process
global states that may need to be treated with care to avoid races.

Also added comments about these variables and moved some of them
to a more suitable compilation unit:

- Move `v8_initialized` to `util.h` since it's only used in
  `util.cc` and `node.cc`
- Rename `process_mutex` to `tty_mutex` and move it into
  `node_errors.cc` since that's the only place it's used
  to guard the tty.
- Move `per_process_opts_mutex` and `per_process_opts`
  into `node_options.h` and rename them to
  `per_process::cli_options[_mutex]`
- Rename `node_isolate[_mutex]` to `per_process::main_isolate[_mutex]`

PR-URL: https://github.com/nodejs/node/pull/25302
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
This commit is contained in:
Joyee Cheung 2019-01-01 13:56:53 +08:00 committed by Anna Henningsen
parent ae2d1f0e05
commit 9db9e7e541
No known key found for this signature in database
GPG Key ID: 9C63F3A6CD2AD8F9
17 changed files with 125 additions and 91 deletions
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3
src/env.cc
View File

@ -79,7 +79,8 @@ IsolateData::IsolateData(Isolate* isolate,
if (platform_ != nullptr)
platform_->RegisterIsolate(isolate_, event_loop);
options_.reset(new PerIsolateOptions(*per_process_opts->per_isolate));
options_.reset(
new PerIsolateOptions(*(per_process::cli_options->per_isolate)));
// Create string and private symbol properties as internalized one byte
// strings after the platform is properly initialized.

90
src/node.cc
View File

@ -139,21 +139,31 @@ using v8::Undefined;
using v8::V8;
using v8::Value;
namespace per_process {
// Tells whether --prof is passed.
// TODO(joyeecheung): move env->options()->prof_process to
// per_process::cli_options.prof_process and use that instead.
static bool v8_is_profiling = false;
// Bit flag used to track security reverts (see node_revert.h)
unsigned int reverted = 0;
// TODO(joyeecheung): these are no longer necessary. Remove them.
// See: https://github.com/nodejs/node/pull/25302#discussion_r244924196
// Isolate on the main thread
static Mutex main_isolate_mutex;
static Isolate* main_isolate;
// node_revert.h
// Bit flag used to track security reverts.
unsigned int reverted_cve = 0;
// util.h
// Tells whether the per-process V8::Initialize() is called and
// if it is safe to call v8::Isolate::GetCurrent().
bool v8_initialized = false;
// node_internals.h
// 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;
} // namespace per_process
// Ensures that __metadata trace events are only emitted
// when tracing is enabled.
@ -269,14 +279,15 @@ static struct {
#endif // HAVE_INSPECTOR
void StartTracingAgent() {
if (per_process_opts->trace_event_categories.empty()) {
if (per_process::cli_options->trace_event_categories.empty()) {
tracing_file_writer_ = tracing_agent_->DefaultHandle();
} else {
tracing_file_writer_ = tracing_agent_->AddClient(
ParseCommaSeparatedSet(per_process_opts->trace_event_categories),
ParseCommaSeparatedSet(
per_process::cli_options->trace_event_categories),
std::unique_ptr<tracing::AsyncTraceWriter>(
new tracing::NodeTraceWriter(
per_process_opts->trace_event_file_pattern)),
per_process::cli_options->trace_event_file_pattern)),
tracing::Agent::kUseDefaultCategories);
}
}
@ -500,7 +511,7 @@ const char* signo_string(int signo) {
}
void* ArrayBufferAllocator::Allocate(size_t size) {
if (zero_fill_field_ || per_process_opts->zero_fill_all_buffers)
if (zero_fill_field_ || per_process::cli_options->zero_fill_all_buffers)
return UncheckedCalloc(size);
else
return UncheckedMalloc(size);
@ -1276,12 +1287,12 @@ void ProcessArgv(std::vector<std::string>* args,
{
// TODO(addaleax): The mutex here should ideally be held during the
// entire function, but that doesn't play well with the exit() calls below.
Mutex::ScopedLock lock(per_process_opts_mutex);
Mutex::ScopedLock lock(per_process::cli_options_mutex);
options_parser::PerProcessOptionsParser::instance.Parse(
args,
exec_args,
&v8_args,
per_process_opts.get(),
per_process::cli_options.get(),
is_env ? kAllowedInEnvironment : kDisallowedInEnvironment,
&errors);
}
@ -1293,20 +1304,20 @@ void ProcessArgv(std::vector<std::string>* args,
exit(9);
}
if (per_process_opts->print_version) {
if (per_process::cli_options->print_version) {
printf("%s\n", NODE_VERSION);
exit(0);
}
if (per_process_opts->print_v8_help) {
if (per_process::cli_options->print_v8_help) {
V8::SetFlagsFromString("--help", 6);
exit(0);
}
for (const std::string& cve : per_process_opts->security_reverts)
for (const std::string& cve : per_process::cli_options->security_reverts)
Revert(cve.c_str());
auto env_opts = per_process_opts->per_isolate->per_env;
auto env_opts = per_process::cli_options->per_isolate->per_env;
if (std::find(v8_args.begin(), v8_args.end(),
"--abort-on-uncaught-exception") != v8_args.end() ||
std::find(v8_args.begin(), v8_args.end(),
@ -1319,14 +1330,14 @@ void ProcessArgv(std::vector<std::string>* args,
// behavior but it could also interfere with the user's intentions in ways
// we fail to anticipate. Dillema.
if (std::find(v8_args.begin(), v8_args.end(), "--prof") != v8_args.end()) {
v8_is_profiling = true;
per_process::v8_is_profiling = true;
}
#ifdef __POSIX__
// Block SIGPROF signals when sleeping in epoll_wait/kevent/etc. Avoids the
// performance penalty of frequent EINTR wakeups when the profiler is running.
// Only do this for v8.log profiling, as it breaks v8::CpuProfiler users.
if (v8_is_profiling) {
if (per_process::v8_is_profiling) {
uv_loop_configure(uv_default_loop(), UV_LOOP_BLOCK_SIGNAL, SIGPROF);
}
#endif
@ -1355,7 +1366,7 @@ void ProcessArgv(std::vector<std::string>* args,
void Init(std::vector<std::string>* argv,
std::vector<std::string>* exec_argv) {
// Initialize prog_start_time to get relative uptime.
prog_start_time = static_cast<double>(uv_now(uv_default_loop()));
per_process::prog_start_time = static_cast<double>(uv_now(uv_default_loop()));
// Register built-in modules
binding::RegisterBuiltinModules();
@ -1371,7 +1382,7 @@ void Init(std::vector<std::string>* argv,
#endif
std::shared_ptr<EnvironmentOptions> default_env_options =
per_process_opts->per_isolate->per_env;
per_process::cli_options->per_isolate->per_env;
{
std::string text;
default_env_options->pending_deprecation =
@ -1400,7 +1411,7 @@ void Init(std::vector<std::string>* argv,
}
#if HAVE_OPENSSL
std::string* openssl_config = &per_process_opts->openssl_config;
std::string* openssl_config = &per_process::cli_options->openssl_config;
if (openssl_config->empty()) {
credentials::SafeGetenv("OPENSSL_CONF", openssl_config);
}
@ -1434,16 +1445,17 @@ void Init(std::vector<std::string>* argv,
ProcessArgv(argv, exec_argv, false);
// Set the process.title immediately after processing argv if --title is set.
if (!per_process_opts->title.empty())
uv_set_process_title(per_process_opts->title.c_str());
if (!per_process::cli_options->title.empty())
uv_set_process_title(per_process::cli_options->title.c_str());
#if defined(NODE_HAVE_I18N_SUPPORT)
// If the parameter isn't given, use the env variable.
if (per_process_opts->icu_data_dir.empty())
credentials::SafeGetenv("NODE_ICU_DATA", &per_process_opts->icu_data_dir);
if (per_process::cli_options->icu_data_dir.empty())
credentials::SafeGetenv("NODE_ICU_DATA",
&per_process::cli_options->icu_data_dir);
// Initialize ICU.
// If icu_data_dir is empty here, it will load the 'minimal' data.
if (!i18n::InitializeICUDirectory(per_process_opts->icu_data_dir)) {
if (!i18n::InitializeICUDirectory(per_process::cli_options->icu_data_dir)) {
fprintf(stderr,
"%s: could not initialize ICU "
"(check NODE_ICU_DATA or --icu-data-dir parameters)\n",
@ -1604,7 +1616,7 @@ Environment* CreateEnvironment(IsolateData* isolate_data,
std::vector<std::string> args(argv, argv + argc);
std::vector<std::string> exec_args(exec_argv, exec_argv + exec_argc);
Environment* env = new Environment(isolate_data, context);
env->Start(args, exec_args, v8_is_profiling);
env->Start(args, exec_args, per_process::v8_is_profiling);
return env;
}
@ -1678,7 +1690,7 @@ inline int Start(Isolate* isolate, IsolateData* isolate_data,
Local<Context> context = NewContext(isolate);
Context::Scope context_scope(context);
Environment env(isolate_data, context);
env.Start(args, exec_args, v8_is_profiling);
env.Start(args, exec_args, per_process::v8_is_profiling);
const char* path = args.size() > 1 ? args[1].c_str() : nullptr;
StartInspector(&env, path);
@ -1785,9 +1797,9 @@ inline int Start(uv_loop_t* event_loop,
return 12; // Signal internal error.
{
Mutex::ScopedLock scoped_lock(node_isolate_mutex);
CHECK_NULL(node_isolate);
node_isolate = isolate;
Mutex::ScopedLock scoped_lock(per_process::main_isolate_mutex);
CHECK_NULL(per_process::main_isolate);
per_process::main_isolate = isolate;
}
int exit_code;
@ -1812,9 +1824,9 @@ inline int Start(uv_loop_t* event_loop,
}
{
Mutex::ScopedLock scoped_lock(node_isolate_mutex);
CHECK_EQ(node_isolate, isolate);
node_isolate = nullptr;
Mutex::ScopedLock scoped_lock(per_process::main_isolate_mutex);
CHECK_EQ(per_process::main_isolate, isolate);
per_process::main_isolate = nullptr;
}
isolate->Dispose();
@ -1862,14 +1874,14 @@ int Start(int argc, char** argv) {
V8::SetEntropySource(crypto::EntropySource);
#endif // HAVE_OPENSSL
InitializeV8Platform(per_process_opts->v8_thread_pool_size);
InitializeV8Platform(per_process::cli_options->v8_thread_pool_size);
V8::Initialize();
performance::performance_v8_start = PERFORMANCE_NOW();
v8_initialized = true;
per_process::v8_initialized = true;
const int exit_code =
Start(uv_default_loop(), args, exec_args);
v8_platform.StopTracingAgent();
v8_initialized = false;
per_process::v8_initialized = false;
V8::Dispose();
// uv_run cannot be called from the time before the beforeExit callback

6
src/node_buffer.cc
View File

@ -59,9 +59,9 @@ namespace node {
namespace {
inline void* BufferMalloc(size_t length) {
return per_process_opts->zero_fill_all_buffers ?
node::UncheckedCalloc(length) :
node::UncheckedMalloc(length);
return per_process::cli_options->zero_fill_all_buffers ?
node::UncheckedCalloc(length) :
node::UncheckedMalloc(length);
}
} // namespace

2
src/node_config.cc
View File

@ -41,7 +41,7 @@ static void Initialize(Local<Object> target,
#ifdef NODE_FIPS_MODE
READONLY_TRUE_PROPERTY(target, "fipsMode");
// TODO(addaleax): Use options parser variable instead.
if (per_process_opts->force_fips_crypto)
if (per_process::cli_options->force_fips_crypto)
READONLY_TRUE_PROPERTY(target, "fipsForced");
#endif

7
src/node_constants.cc
View File

@ -1234,9 +1234,10 @@ void DefineCryptoConstants(Local<Object> target) {
NODE_DEFINE_STRING_CONSTANT(target,
"defaultCoreCipherList",
DEFAULT_CIPHER_LIST_CORE);
NODE_DEFINE_STRING_CONSTANT(target,
"defaultCipherList",
per_process_opts->tls_cipher_list.c_str());
NODE_DEFINE_STRING_CONSTANT(
target,
"defaultCipherList",
per_process::cli_options->tls_cipher_list.c_str());
NODE_DEFINE_CONSTANT(target, TLS1_VERSION);
NODE_DEFINE_CONSTANT(target, TLS1_1_VERSION);

2
src/node_credentials.cc
View File

@ -38,7 +38,7 @@ bool SafeGetenv(const char* key, std::string* text) {
#endif
{
Mutex::ScopedLock lock(environ_mutex);
Mutex::ScopedLock lock(per_process::env_var_mutex);
if (const char* value = getenv(key)) {
*text = value;
return true;

17
src/node_crypto.cc
View File

@ -787,7 +787,7 @@ static X509_STORE* NewRootCertStore() {
if (*system_cert_path != '\0') {
X509_STORE_load_locations(store, system_cert_path, nullptr);
}
if (per_process_opts->ssl_openssl_cert_store) {
if (per_process::cli_options->ssl_openssl_cert_store) {
X509_STORE_set_default_paths(store);
} else {
for (X509* cert : root_certs_vector) {
@ -6183,16 +6183,15 @@ void InitCryptoOnce() {
OPENSSL_no_config();
// --openssl-config=...
if (!per_process_opts->openssl_config.empty()) {
if (!per_process::cli_options->openssl_config.empty()) {
OPENSSL_load_builtin_modules();
#ifndef OPENSSL_NO_ENGINE
ENGINE_load_builtin_engines();
#endif
ERR_clear_error();
CONF_modules_load_file(
per_process_opts->openssl_config.c_str(),
nullptr,
CONF_MFLAGS_DEFAULT_SECTION);
CONF_modules_load_file(per_process::cli_options->openssl_config.c_str(),
nullptr,
CONF_MFLAGS_DEFAULT_SECTION);
int err = ERR_get_error();
if (0 != err) {
fprintf(stderr,
@ -6208,8 +6207,8 @@ void InitCryptoOnce() {
#ifdef NODE_FIPS_MODE
/* Override FIPS settings in cnf file, if needed. */
unsigned long err = 0; // NOLINT(runtime/int)
if (per_process_opts->enable_fips_crypto ||
per_process_opts->force_fips_crypto) {
if (per_process::cli_options->enable_fips_crypto ||
per_process::cli_options->force_fips_crypto) {
if (0 == FIPS_mode() && !FIPS_mode_set(1)) {
err = ERR_get_error();
}
@ -6272,7 +6271,7 @@ void GetFipsCrypto(const FunctionCallbackInfo<Value>& args) {
}
void SetFipsCrypto(const FunctionCallbackInfo<Value>& args) {
CHECK(!per_process_opts->force_fips_crypto);
CHECK(!per_process::cli_options->force_fips_crypto);
Environment* env = Environment::GetCurrent(args);
const bool enabled = FIPS_mode();
bool enable = args[0]->BooleanValue(env->isolate());

14
src/node_env_var.cc
View File

@ -25,13 +25,17 @@ using v8::PropertyCallbackInfo;
using v8::String;
using v8::Value;
namespace per_process {
Mutex env_var_mutex;
} // namespace per_process
static void EnvGetter(Local<Name> property,
const PropertyCallbackInfo<Value>& info) {
Isolate* isolate = info.GetIsolate();
if (property->IsSymbol()) {
return info.GetReturnValue().SetUndefined();
}
Mutex::ScopedLock lock(environ_mutex);
Mutex::ScopedLock lock(per_process::env_var_mutex);
#ifdef __POSIX__
node::Utf8Value key(isolate, property);
const char* val = getenv(*key);
@ -80,7 +84,7 @@ static void EnvSetter(Local<Name> property,
return;
}
Mutex::ScopedLock lock(environ_mutex);
Mutex::ScopedLock lock(per_process::env_var_mutex);
#ifdef __POSIX__
node::Utf8Value key(info.GetIsolate(), property);
node::Utf8Value val(info.GetIsolate(), value);
@ -100,7 +104,7 @@ static void EnvSetter(Local<Name> property,
static void EnvQuery(Local<Name> property,
const PropertyCallbackInfo<Integer>& info) {
Mutex::ScopedLock lock(environ_mutex);
Mutex::ScopedLock lock(per_process::env_var_mutex);
int32_t rc = -1; // Not found unless proven otherwise.
if (property->IsString()) {
#ifdef __POSIX__
@ -127,7 +131,7 @@ static void EnvQuery(Local<Name> property,
static void EnvDeleter(Local<Name> property,
const PropertyCallbackInfo<Boolean>& info) {
Mutex::ScopedLock lock(environ_mutex);
Mutex::ScopedLock lock(per_process::env_var_mutex);
if (property->IsString()) {
#ifdef __POSIX__
node::Utf8Value key(info.GetIsolate(), property);
@ -148,7 +152,7 @@ static void EnvEnumerator(const PropertyCallbackInfo<Array>& info) {
Environment* env = Environment::GetCurrent(info);
Isolate* isolate = env->isolate();
Mutex::ScopedLock lock(environ_mutex);
Mutex::ScopedLock lock(per_process::env_var_mutex);
Local<Array> envarr;
int env_size = 0;
#ifdef __POSIX__

6
src/node_errors.cc
View File

@ -35,6 +35,10 @@ bool IsExceptionDecorated(Environment* env, Local<Value> er) {
return false;
}
namespace per_process {
static Mutex tty_mutex;
} // namespace per_process
void AppendExceptionLine(Environment* env,
Local<Value> er,
Local<Message> message,
@ -137,7 +141,7 @@ void AppendExceptionLine(Environment* env,
// by the caller.
if (!can_set_arrow || (mode == FATAL_ERROR && !err_obj->IsNativeError())) {
if (env->printed_error()) return;
Mutex::ScopedLock lock(process_mutex);
Mutex::ScopedLock lock(per_process::tty_mutex);
env->set_printed_error(true);
uv_tty_reset_mode();

5
src/node_http_parser_impl.h
View File

@ -830,7 +830,7 @@ class Parser : public AsyncWrap, public StreamListener {
int TrackHeader(size_t len) {
#ifdef NODE_EXPERIMENTAL_HTTP
header_nread_ += len;
if (header_nread_ >= per_process_opts->max_http_header_size) {
if (header_nread_ >= per_process::cli_options->max_http_header_size) {
llhttp_set_error_reason(&parser_, "HPE_HEADER_OVERFLOW:Header overflow");
return HPE_USER;
}
@ -915,7 +915,8 @@ const parser_settings_t Parser::settings = {
#ifndef NODE_EXPERIMENTAL_HTTP
void InitMaxHttpHeaderSizeOnce() {
const uint32_t max_http_header_size = per_process_opts->max_http_header_size;
const uint32_t max_http_header_size =
per_process::cli_options->max_http_header_size;
http_parser_set_max_header_size(max_http_header_size);
}
#endif /* NODE_EXPERIMENTAL_HTTP */

14
src/node_internals.h
View File

@ -83,14 +83,10 @@ namespace native_module {
class NativeModuleLoader;
}
extern Mutex process_mutex;
extern Mutex environ_mutex;
// Tells whether it is safe to call v8::Isolate::GetCurrent().
extern bool v8_initialized;
extern Mutex per_process_opts_mutex;
extern std::shared_ptr<PerProcessOptions> per_process_opts;
namespace per_process {
extern Mutex env_var_mutex;
extern double prog_start_time;
} // namespace per_process
// Forward declaration
class Environment;
@ -699,8 +695,6 @@ static inline const char* errno_string(int errorno) {
// Functions defined in node.cc that are exposed via the bootstrapper object
extern double prog_start_time;
void RawDebug(const v8::FunctionCallbackInfo<v8::Value>& args);
void DebugPortGetter(v8::Local<v8::Name> property,

21
src/node_options.cc
View File

@ -17,6 +17,11 @@ using v8::Value;
namespace node {
namespace per_process {
Mutex cli_options_mutex;
std::shared_ptr<PerProcessOptions> cli_options{new PerProcessOptions()};
} // namespace per_process
void PerProcessOptions::CheckOptions(std::vector<std::string>* errors) {
#if HAVE_OPENSSL
if (use_openssl_ca && use_bundled_ca) {
@ -397,7 +402,7 @@ HostPort SplitHostPort(const std::string& arg,
// Return a map containing all the options and their metadata as well
// as the aliases
void GetOptions(const FunctionCallbackInfo<Value>& args) {
Mutex::ScopedLock lock(per_process_opts_mutex);
Mutex::ScopedLock lock(per_process::cli_options_mutex);
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
Local<Context> context = env->context();
@ -405,13 +410,13 @@ void GetOptions(const FunctionCallbackInfo<Value>& args) {
// Temporarily act as if the current Environment's/IsolateData's options were
// the default options, i.e. like they are the ones we'd access for global
// options parsing, so that all options are available from the main parser.
auto original_per_isolate = per_process_opts->per_isolate;
per_process_opts->per_isolate = env->isolate_data()->options();
auto original_per_env = per_process_opts->per_isolate->per_env;
per_process_opts->per_isolate->per_env = env->options();
auto original_per_isolate = per_process::cli_options->per_isolate;
per_process::cli_options->per_isolate = env->isolate_data()->options();
auto original_per_env = per_process::cli_options->per_isolate->per_env;
per_process::cli_options->per_isolate->per_env = env->options();
OnScopeLeave on_scope_leave([&]() {
per_process_opts->per_isolate->per_env = original_per_env;
per_process_opts->per_isolate = original_per_isolate;
per_process::cli_options->per_isolate->per_env = original_per_env;
per_process::cli_options->per_isolate = original_per_isolate;
});
const auto& parser = PerProcessOptionsParser::instance;
@ -421,7 +426,7 @@ void GetOptions(const FunctionCallbackInfo<Value>& args) {
Local<Value> value;
const auto& option_info = item.second;
auto field = option_info.field;
PerProcessOptions* opts = per_process_opts.get();
PerProcessOptions* opts = per_process::cli_options.get();
switch (option_info.type) {
case kNoOp:
case kV8Option:

8
src/node_options.h
View File

@ -8,6 +8,7 @@
#include <unordered_map>
#include <vector>
#include "node_constants.h"
#include "node_mutex.h"
#include "util.h"
namespace node {
@ -422,6 +423,13 @@ class PerProcessOptionsParser : public OptionsParser<PerProcessOptions> {
};
} // namespace options_parser
namespace per_process {
extern Mutex cli_options_mutex;
extern std::shared_ptr<PerProcessOptions> cli_options;
} // namespace per_process
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

5
src/node_process.cc
View File

@ -50,9 +50,6 @@ using v8::Uint32;
using v8::Uint32Array;
using v8::Value;
Mutex process_mutex;
Mutex environ_mutex;
// Microseconds in a second, as a float, used in CPUUsage() below
#define MICROS_PER_SEC 1e6
// used in Hrtime() below
@ -244,7 +241,7 @@ static void Uptime(const FunctionCallbackInfo<Value>& args) {
double uptime;
uv_update_time(env->event_loop());
uptime = uv_now(env->event_loop()) - prog_start_time;
uptime = uv_now(env->event_loop()) - per_process::prog_start_time;
args.GetReturnValue().Set(uptime / 1000);
}

8
src/node_revert.h
View File

@ -24,7 +24,9 @@ enum reversion {
#undef V
};
extern unsigned int reverted;
namespace per_process {
extern unsigned int reverted_cve;
}
inline const char* RevertMessage(const reversion cve) {
#define V(code, label, msg) case SECURITY_REVERT_##code: return label ": " msg;
@ -37,7 +39,7 @@ inline const char* RevertMessage(const reversion cve) {
}
inline void Revert(const reversion cve) {
reverted |= 1 << cve;
per_process::reverted_cve |= 1 << cve;
printf("SECURITY WARNING: Reverting %s\n", RevertMessage(cve));
}
@ -51,7 +53,7 @@ inline void Revert(const char* cve) {
}
inline bool IsReverted(const reversion cve) {
return reverted & (1 << cve);
return per_process::reverted_cve & (1 << cve);
}
inline bool IsReverted(const char* cve) {

2
src/util.cc
View File

@ -101,7 +101,7 @@ BufferValue::BufferValue(Isolate* isolate, Local<Value> value) {
}
void LowMemoryNotification() {
if (v8_initialized) {
if (per_process::v8_initialized) {
auto isolate = Isolate::GetCurrent();
if (isolate != nullptr) {
isolate->LowMemoryNotification();

6
src/util.h
View File

@ -74,6 +74,12 @@ inline char* UncheckedCalloc(size_t n);
template <typename T>
inline T MultiplyWithOverflowCheck(T a, T b);
namespace per_process {
// Tells whether the per-process V8::Initialize() is called and
// if it is safe to call v8::Isolate::GetCurrent().
extern bool v8_initialized;
} // namespace per_process
// Used by the allocation functions when allocation fails.
// Thin wrapper around v8::Isolate::LowMemoryNotification() that checks
// whether V8 is initialized.