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// Copyright (c) 2012 The Chromium 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 "content/renderer/render_process_impl.h"
#include "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#include <mlang.h>
#include <objidl.h>
#endif
#include <stddef.h>
#include <algorithm>
#include <utility>
#include "base/base_switches.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/debug/crash_logging.h"
#include "base/debug/stack_trace.h"
#include "base/feature_list.h"
#include "base/memory/ptr_util.h"
#include "base/strings/string_split.h"
#include "base/system/sys_info.h"
#include "base/task/thread_pool/initialization_util.h"
#include "base/task/thread_pool/thread_pool_instance.h"
#include "base/time/time.h"
#include "content/common/thread_pool_util.h"
#include "content/public/common/bindings_policy.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "content/public/renderer/content_renderer_client.h"
#include "services/service_manager/embedder/switches.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/web/web_frame.h"
#include "v8/include/v8.h"
#if defined(OS_WIN)
#include "base/win/win_util.h"
#endif
#if defined(OS_LINUX) && defined(ARCH_CPU_X86_64)
#include "v8/include/v8-wasm-trap-handler-posix.h"
#endif
namespace {
void SetV8FlagIfFeature(const base::Feature& feature, const char* v8_flag) {
if (base::FeatureList::IsEnabled(feature)) {
v8::V8::SetFlagsFromString(v8_flag, strlen(v8_flag));
}
}
void SetV8FlagIfNotFeature(const base::Feature& feature, const char* v8_flag) {
if (!base::FeatureList::IsEnabled(feature)) {
v8::V8::SetFlagsFromString(v8_flag, strlen(v8_flag));
}
}
void SetV8FlagIfHasSwitch(const char* switch_name, const char* v8_flag) {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(switch_name)) {
v8::V8::SetFlagsFromString(v8_flag, strlen(v8_flag));
}
}
std::unique_ptr<base::ThreadPoolInstance::InitParams>
GetThreadPoolInitParams() {
constexpr int kMaxNumThreadsInForegroundPoolLowerBound = 3;
return std::make_unique<base::ThreadPoolInstance::InitParams>(
std::max(kMaxNumThreadsInForegroundPoolLowerBound,
content::GetMinForegroundThreadsInRendererThreadPool()));
}
#if defined(DCHECK_IS_CONFIGURABLE)
void V8DcheckCallbackHandler(const char* file, int line, const char* message) {
// TODO(siggi): Set a crash key or a breadcrumb so the fact that we hit a
// V8 DCHECK gets out in the crash report.
::logging::LogMessage(file, line, logging::LOG_DCHECK).stream() << message;
}
#endif // defined(DCHECK_IS_CONFIGURABLE)
} // namespace
namespace content {
RenderProcessImpl::RenderProcessImpl()
: RenderProcess("Renderer", GetThreadPoolInitParams()) {
#if defined(DCHECK_IS_CONFIGURABLE)
// Some official builds ship with DCHECKs compiled in. Failing DCHECKs then
// are either fatal or simply log the error, based on a feature flag.
// Make sure V8 follows suit by setting a Dcheck handler that forwards to
// the Chrome base logging implementation.
v8::V8::SetDcheckErrorHandler(&V8DcheckCallbackHandler);
if (!base::FeatureList::IsEnabled(base::kDCheckIsFatalFeature)) {
// These V8 flags default on in this build configuration. This triggers
// additional verification and code generation, which both slows down V8,
// and can lead to fatal CHECKs. Turn these flags down to get something
// closer to V8s normal performance and behavior.
constexpr char kDisabledFlags[] =
"--noturbo_verify "
"--noturbo_verify_allocation "
"--nodebug_code";
v8::V8::SetFlagsFromString(kDisabledFlags, sizeof(kDisabledFlags));
}
#endif // defined(DCHECK_IS_CONFIGURABLE)
if (base::SysInfo::IsLowEndDevice()) {
std::string optimize_flag("--optimize-for-size");
v8::V8::SetFlagsFromString(optimize_flag.c_str(), optimize_flag.size());
}
SetV8FlagIfHasSwitch(switches::kDisableJavaScriptHarmonyShipping,
"--noharmony-shipping");
SetV8FlagIfHasSwitch(switches::kJavaScriptHarmony, "--harmony");
SetV8FlagIfHasSwitch(switches::kEnableExperimentalWebAssemblyFeatures,
"--wasm-staging");
constexpr char kModuleFlags[] =
"--harmony-dynamic-import --harmony-import-meta";
v8::V8::SetFlagsFromString(kModuleFlags, sizeof(kModuleFlags));
SetV8FlagIfFeature(features::kV8VmFuture, "--future");
SetV8FlagIfNotFeature(features::kV8VmFuture, "--no-future");
SetV8FlagIfFeature(features::kWebAssemblyBaseline, "--liftoff");
SetV8FlagIfNotFeature(features::kWebAssemblyBaseline, "--no-liftoff");
SetV8FlagIfFeature(features::kWebAssemblyLazyCompilation,
"--wasm-lazy-compilation");
SetV8FlagIfNotFeature(features::kWebAssemblyLazyCompilation,
"--no-wasm-lazy-compilation");
SetV8FlagIfFeature(features::kWebAssemblySimd, "--experimental-wasm-simd");
SetV8FlagIfNotFeature(features::kWebAssemblySimd,
"--no-experimental-wasm-simd");
SetV8FlagIfFeature(blink::features::kTopLevelAwait,
"--harmony-top-level-await");
if (base::FeatureList::IsEnabled(features::kWebAssemblyThreads)) {
constexpr char kFlags[] =
"--harmony-sharedarraybuffer "
"--experimental-wasm-threads";
v8::V8::SetFlagsFromString(kFlags, sizeof(kFlags));
} else {
SetV8FlagIfFeature(features::kSharedArrayBuffer,
"--harmony-sharedarraybuffer");
SetV8FlagIfNotFeature(features::kSharedArrayBuffer,
"--no-harmony-sharedarraybuffer");
}
SetV8FlagIfFeature(features::kWebAssemblyTiering, "--wasm-tier-up");
SetV8FlagIfNotFeature(features::kWebAssemblyTiering, "--no-wasm-tier-up");
SetV8FlagIfNotFeature(features::kWebAssemblyTrapHandler,
"--no-wasm-trap-handler");
#if defined(OS_LINUX) && defined(ARCH_CPU_X86_64)
if (base::FeatureList::IsEnabled(features::kWebAssemblyTrapHandler)) {
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
if (!command_line->HasSwitch(
service_manager::switches::kDisableInProcessStackTraces)) {
// Only enable WebAssembly trap handler if we can set the callback.
if (base::debug::SetStackDumpFirstChanceCallback(
v8::TryHandleWebAssemblyTrapPosix)) {
// We registered the WebAssembly trap handler callback with the stack
// dump signal handler successfully. We can tell V8 that it can enable
// WebAssembly trap handler without using the V8 signal handler.
v8::V8::EnableWebAssemblyTrapHandler(/*use_v8_signal_handler=*/false);
}
} else if (!command_line->HasSwitch(switches::kEnableCrashReporter) &&
!command_line->HasSwitch(
switches::kEnableCrashReporterForTesting)) {
// If we are using WebAssembly trap handling but both Breakpad and
// in-process stack traces are disabled then there will be no signal
// handler. In this case, we fall back on V8's default handler
// (https://crbug.com/798150).
v8::V8::EnableWebAssemblyTrapHandler(/*use_v8_signal_handler=*/true);
}
}
#endif
#if defined(OS_WIN) && defined(ARCH_CPU_X86_64)
if (base::FeatureList::IsEnabled(features::kWebAssemblyTrapHandler)) {
// On Windows we use the default trap handler provided by V8.
bool use_v8_trap_handler = true;
v8::V8::EnableWebAssemblyTrapHandler(use_v8_trap_handler);
}
#endif
#if defined(OS_MACOSX) && defined(ARCH_CPU_X86_64)
if (base::FeatureList::IsEnabled(features::kWebAssemblyTrapHandler)) {
// On macOS, Crashpad uses exception ports to handle signals in a different
// process. As we cannot just pass a callback to this other process, we ask
// V8 to install its own signal handler to deal with WebAssembly traps.
bool use_v8_signal_handler = true;
v8::V8::EnableWebAssemblyTrapHandler(use_v8_signal_handler);
}
#endif // defined(OS_MACOSX) && defined(ARCH_CPU_X86_64)
const base::CommandLine& command_line =
*base::CommandLine::ForCurrentProcess();
if (command_line.HasSwitch(switches::kNoV8UntrustedCodeMitigations)) {
const char* disable_mitigations = "--no-untrusted-code-mitigations";
v8::V8::SetFlagsFromString(disable_mitigations,
strlen(disable_mitigations));
}
if (command_line.HasSwitch(switches::kJavaScriptFlags)) {
std::string js_flags =
command_line.GetSwitchValueASCII(switches::kJavaScriptFlags);
std::vector<base::StringPiece> flag_list = base::SplitStringPiece(
js_flags, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
for (const auto& flag : flag_list) {
v8::V8::SetFlagsFromString(flag.as_string().c_str(), flag.size());
}
}
}
RenderProcessImpl::~RenderProcessImpl() {
#ifndef NDEBUG
int count = blink::WebFrame::InstanceCount();
if (count)
DLOG(ERROR) << "WebFrame LEAKED " << count << " TIMES";
#endif
GetShutDownEvent()->Signal();
}
std::unique_ptr<RenderProcess> RenderProcessImpl::Create() {
return base::WrapUnique(new RenderProcessImpl());
}
void RenderProcessImpl::AddRefProcess() {
NOTREACHED();
}
void RenderProcessImpl::ReleaseProcess() {
NOTREACHED();
}
} // namespace content
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