
Bug: v8:12547 Change-Id: Ief07029c051871b66a603186c13dbe121f573e1b Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5908669 Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Commit-Queue: Shu-yu Guo <syg@chromium.org> Reviewed-by: Philip Rogers <pdr@chromium.org> Reviewed-by: Nasko Oskov <nasko@chromium.org> Cr-Commit-Position: refs/heads/main@{#1365194}
231 lines
8.5 KiB
C++
231 lines
8.5 KiB
C++
// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "content/renderer/render_process_impl.h"
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#include "build/build_config.h"
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#if BUILDFLAG(IS_WIN)
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#include <windows.h>
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#include <mlang.h>
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#include <objidl.h>
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#endif
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#include <stddef.h>
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#include <algorithm>
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#include <utility>
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#include "base/base_switches.h"
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#include "base/command_line.h"
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#include "base/compiler_specific.h"
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#include "base/debug/crash_logging.h"
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#include "base/feature_list.h"
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#include "base/functional/bind.h"
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#include "base/memory/ptr_util.h"
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#include "base/synchronization/waitable_event.h"
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#include "base/system/sys_info.h"
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#include "base/task/task_features.h"
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#include "base/task/thread_pool/initialization_util.h"
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#include "base/task/thread_pool/thread_pool_instance.h"
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#include "content/common/features.h"
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#include "content/common/thread_pool_util.h"
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#include "content/public/common/bindings_policy.h"
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#include "content/public/common/content_client.h"
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#include "content/public/common/content_features.h"
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#include "content/public/common/content_switches.h"
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#include "content/public/renderer/content_renderer_client.h"
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#include "services/network/public/cpp/features.h"
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#include "third_party/blink/public/common/features.h"
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#include "third_party/blink/public/platform/web_runtime_features.h"
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#include "third_party/blink/public/web/blink.h"
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#include "third_party/blink/public/web/web_frame.h"
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#include "v8/include/v8-initialization.h"
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#if BUILDFLAG(IS_WIN)
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#include "base/win/win_util.h"
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#endif
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namespace {
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void SetV8FlagIfOverridden(const base::Feature& feature,
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const char* enabling_flag,
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const char* disabling_flag) {
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auto overridden_state = base::FeatureList::GetStateIfOverridden(feature);
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if (!overridden_state.has_value()) {
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return;
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}
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if (overridden_state.value()) {
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v8::V8::SetFlagsFromString(enabling_flag, strlen(enabling_flag));
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} else {
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v8::V8::SetFlagsFromString(disabling_flag, strlen(disabling_flag));
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}
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}
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void SetV8FlagIfHasSwitch(const char* switch_name, const char* v8_flag) {
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if (base::CommandLine::ForCurrentProcess()->HasSwitch(switch_name)) {
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v8::V8::SetFlagsFromString(v8_flag, strlen(v8_flag));
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}
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}
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std::unique_ptr<base::ThreadPoolInstance::InitParams>
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GetThreadPoolInitParams() {
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constexpr size_t kMaxNumThreadsInForegroundPoolLowerBound = 3;
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size_t desired_num_threads =
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std::max(kMaxNumThreadsInForegroundPoolLowerBound,
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content::GetMinForegroundThreadsInRendererThreadPool());
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if (base::FeatureList::IsEnabled(base::kThreadPoolCap2)) {
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// Cap the threadpool to an initial fixed size.
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// Note: The size can still grow beyond the value set here
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// when tasks are blocked for a certain period of time.
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const int max_allowed_workers_per_pool =
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base::kThreadPoolCapRestrictedCount.Get();
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desired_num_threads = std::min(
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desired_num_threads, static_cast<size_t>(max_allowed_workers_per_pool));
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}
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return std::make_unique<base::ThreadPoolInstance::InitParams>(
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desired_num_threads);
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}
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#if BUILDFLAG(DCHECK_IS_CONFIGURABLE)
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void V8DcheckCallbackHandler(const char* file, int line, const char* message) {
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// Only file/line are used from base::Location::Current() inside DCHECKs right
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// now so this should correctly pretend to be the original v8 point of
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// failure.
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::logging::CheckError::DCheck(message,
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base::Location::Current("", file, line));
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}
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#endif // BUILDFLAG(DCHECK_IS_CONFIGURABLE)
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} // namespace
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namespace content {
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RenderProcessImpl::RenderProcessImpl()
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: RenderProcess(GetThreadPoolInitParams()) {
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#if BUILDFLAG(DCHECK_IS_CONFIGURABLE)
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// Some official builds ship with DCHECKs compiled in. Failing DCHECKs then
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// are either fatal or simply log the error, based on a feature flag.
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// Make sure V8 follows suit by setting a Dcheck handler that forwards to
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// the Chrome base logging implementation.
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v8::V8::SetDcheckErrorHandler(&V8DcheckCallbackHandler);
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if (!base::FeatureList::IsEnabled(base::kDCheckIsFatalFeature)) {
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// These V8 flags default on in this build configuration. This triggers
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// additional verification and code generation, which both slows down V8,
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// and can lead to fatal CHECKs. Turn these flags down to get something
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// closer to V8s normal performance and behavior.
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constexpr char kDisabledFlags[] =
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"--noturbo_verify "
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"--noturbo_verify_allocation "
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"--nodebug_code";
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v8::V8::SetFlagsFromString(kDisabledFlags, sizeof(kDisabledFlags));
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}
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#endif // BUILDFLAG(DCHECK_IS_CONFIGURABLE)
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if (base::SysInfo::IsLowEndDevice()) {
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std::string optimize_flag("--optimize-for-size");
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v8::V8::SetFlagsFromString(optimize_flag.c_str(), optimize_flag.size());
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}
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/////////////////////////////////////////////////////////////////////////////
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// V8 flags are typically set in gin/v8_initializer.cc. Only those flags
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// should be set here that cannot be set in gin/v8_initializer.cc because
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// e.g. the flag can be set in chrome://flags.
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/////////////////////////////////////////////////////////////////////////////
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SetV8FlagIfHasSwitch(switches::kDisableJavaScriptHarmonyShipping,
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"--noharmony-shipping");
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SetV8FlagIfHasSwitch(switches::kJavaScriptHarmony, "--harmony");
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SetV8FlagIfHasSwitch(switches::kEnableExperimentalWebAssemblyFeatures,
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"--wasm-staging");
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SetV8FlagIfOverridden(features::kV8VmFuture, "--future", "--no-future");
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SetV8FlagIfOverridden(features::kWebAssemblyBaseline, "--liftoff",
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"--no-liftoff");
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// V8's WASM stack switching support is sufficient to enable JavaScript
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// Promise Integration.
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SetV8FlagIfOverridden(features::kEnableExperimentalWebAssemblyJSPI,
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"--experimental-wasm-jspi",
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"--no-experimental-wasm-jspi");
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SetV8FlagIfOverridden(features::kWebAssemblyLazyCompilation,
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"--wasm-lazy-compilation",
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"--no-wasm-lazy-compilation");
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SetV8FlagIfOverridden(features::kWebAssemblyMemory64,
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"--experimental-wasm-memory64",
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"--no-experimental-wasm-memory64");
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SetV8FlagIfOverridden(features::kWebAssemblyTiering, "--wasm-tier-up",
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"--no-wasm-tier-up");
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SetV8FlagIfOverridden(features::kWebAssemblyDynamicTiering,
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"--wasm-dynamic-tiering", "--no-wasm-dynamic-tiering");
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SetV8FlagIfOverridden(blink::features::kWebAssemblyJSStringBuiltins,
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"--experimental-wasm-imported-strings",
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"--no-experimental-wasm-imported-strings");
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bool enable_shared_array_buffer_unconditionally =
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base::FeatureList::IsEnabled(features::kSharedArrayBuffer);
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#if !BUILDFLAG(IS_ANDROID)
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// Bypass the SAB restriction for the Finch "kill switch".
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enable_shared_array_buffer_unconditionally =
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enable_shared_array_buffer_unconditionally ||
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base::FeatureList::IsEnabled(features::kSharedArrayBufferOnDesktop);
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// Bypass the SAB restriction when enabled by Enterprise Policy.
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if (!enable_shared_array_buffer_unconditionally &&
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base::CommandLine::ForCurrentProcess()->HasSwitch(
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switches::kSharedArrayBufferUnrestrictedAccessAllowed)) {
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enable_shared_array_buffer_unconditionally = true;
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blink::WebRuntimeFeatures::EnableSharedArrayBufferUnrestrictedAccessAllowed(
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true);
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}
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#endif
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if (!enable_shared_array_buffer_unconditionally) {
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// It is still possible to enable SharedArrayBuffer per context using the
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// `SharedArrayBufferConstructorEnabledCallback`. This will be done if the
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// context is cross-origin isolated or if it opts in into the reverse origin
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// trial.
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constexpr char kSABPerContextFlag[] =
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"--enable-sharedarraybuffer-per-context";
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v8::V8::SetFlagsFromString(kSABPerContextFlag, sizeof(kSABPerContextFlag));
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}
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if (base::FeatureList::IsEnabled(features::kWebAssemblyTrapHandler)) {
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content::GetContentClient()->renderer()->SetUpWebAssemblyTrapHandler();
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}
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}
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RenderProcessImpl::~RenderProcessImpl() {
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#ifndef NDEBUG
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int count = blink::WebFrame::InstanceCount();
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if (count)
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DLOG(ERROR) << "WebFrame LEAKED " << count << " TIMES";
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#endif
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GetShutDownEvent()->Signal();
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}
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std::unique_ptr<RenderProcess> RenderProcessImpl::Create() {
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return base::WrapUnique(new RenderProcessImpl());
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}
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void RenderProcessImpl::AddRefProcess() {
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NOTREACHED_IN_MIGRATION();
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}
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void RenderProcessImpl::ReleaseProcess() {
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NOTREACHED_IN_MIGRATION();
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}
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} // namespace content
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