deps: V8: backport 20 CPU profiler commits from upstream

[cpu-profiler] Fix bugs and add tests for JITLineInfoTable
https://chromium.googlesource.com/v8/v8/+/4feb5ce7fd5ef8c933f3f5dff2eca1173f85c1e9

[cpu-profiler] Fix incorrect line number calculation.
https://chromium.googlesource.com/v8/v8/+/ddb2856f39632f9e9f623d3cdb4600e636172031

[cpu-profiler] Use std::unordered_map for hashmaps.
https://chromium.googlesource.com/v8/v8/+/35985ce6abc80b85264fe3b87b246fed5f1806e6

[cpu-profiler] Do not store CodeEntries between profiling sessions.
https://chromium.googlesource.com/v8/v8.git/+/8ec48b2117b8092c4956f1ee11a0c85bec3ba1f8

[cpu-profiler] Remove name_prefix field from CodeEntry
https://chromium.googlesource.com/v8/v8.git/+/6f72af25fe43218b60c68129073ddcddb631566e

[cpu-profiler] Extract rare used fields of CodeEntry to an optional object.
https://chromium.googlesource.com/v8/v8.git/+/fcc1ebb55aab38013855834f556f6e874e0eb8b3

[profiler] Refactoring: decouple StringsStorage from Heap object.
https://chromium.googlesource.com/v8/v8/+/a31320f59c911a277566d6c2fa0b0f2ac83e0748

[cpu-profiler] Add a HandleScope to limit memory consumption.
https://chromium.googlesource.com/v8/v8.git/+/3e9f8a4f635e2d946651d6a4df81378266f32dc9

[cpu-profiler] Lazily create CPU profiler.
https://chromium.googlesource.com/v8/v8/+/1426ea1d6d45be0b4d9476bdb5bf3f27cfe578a0

[cpu-profiler] turn several std::map's into unordered_map's.
https://chromium.googlesource.com/v8/v8/+/3ed5dfb8a3cbc7aa0017bd01c2fdd6227485b8ad

[cpu-profiler] Eagerly delete not used CodeEntry'es
https://chromium.googlesource.com/v8/v8.git/+/c6c28f7a412a88df12055e953630a9e93cc64d49

[cpu-profiler] Move bailout reason into rare_info struct
https://chromium.googlesource.com/v8/v8.git/+/29ea4d1ef5360e71c61ecf8db6a5a0a0c3391fd1

[cpu-profiler] Save space in the SourcePositionTable by using a vector.
https://chromium.googlesource.com/v8/v8.git/+/1cb19f0e0a93adbac8c11bc906f951bd8098722d

[cpu-profiler] Only store deopt inline frames for functions that need it
https://chromium.googlesource.com/v8/v8.git/+/0bfcbdd4726920755e51dab28c18ab93e050819b

[cpu-profiler] Add a new profiling mode with a more detailed call tree.
https://chromium.googlesource.com/v8/v8.git/+/ecae80cdb350dde1e654c531b56f5b6c44dc8c77

[cpu-profiler] Reuse free slots in code_entries_
https://chromium.googlesource.com/v8/v8.git/+/3e1126bf15e62c433c4e9cb21316d182f691c63a

[cpu-profiler] Use instruction start as the key for the CodeMap
https://chromium.googlesource.com/v8/v8.git/+/ba752ea4c50713dff1e94f45a79db3ba968a8d66

[cpu-profiler] Add flag to always generate accurate line info.
https://chromium.googlesource.com/v8/v8/+/56baf56790de439b3f69e887e94beb3b301ed77c

[cpu-profiler] Turn on detailed line info for optimized code
https://chromium.googlesource.com/v8/v8/+/84894ce6d2af7feb9e1f5574409355120887326c

[cpu-profiler] Separate the flags for generating extra line information
https://chromium.googlesource.com/v8/v8/+/30ff6719db441cc7ef220d449970cc169067e256

Backport-PR-URL: #21558
PR-URL: #21558
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Yang Guo <yangguo@chromium.org>
Reviewed-By: Rod Vagg <rod@vagg.org>

Author: psmarshall

deps/v8/include/v8-profiler.h

@@ -273,6 +273,16 @@ class V8_EXPORT CpuProfile {
   void Delete();
 };
 
+enum CpuProfilingMode {
+  // In the resulting CpuProfile tree, intermediate nodes in a stack trace
+  // (from the root to a leaf) will have line numbers that point to the start
+  // line of the function, rather than the line of the callsite of the child.
+  kLeafNodeLineNumbers,
+  // In the resulting CpuProfile tree, nodes are separated based on the line
+  // number of their callsite in their parent.
+  kCallerLineNumbers,
+};
+
 /**
  * Interface for controlling CPU profiling. Instance of the
  * profiler can be created using v8::CpuProfiler::New method.
@@ -309,6 +319,13 @@ class V8_EXPORT CpuProfiler {
    * |record_samples| parameter controls whether individual samples should
    * be recorded in addition to the aggregated tree.
    */
+  void StartProfiling(Local<String> title, CpuProfilingMode mode,
+                      bool record_samples = false);
+  /**
+   * The same as StartProfiling above, but the CpuProfilingMode defaults to
+   * kLeafNodeLineNumbers mode, which was the previous default behavior of the
+   * profiler.
+   */
   void StartProfiling(Local<String> title, bool record_samples = false);
 
   /**

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 6
 #define V8_MINOR_VERSION 2
 #define V8_BUILD_NUMBER 414
-#define V8_PATCH_LEVEL 67
+#define V8_PATCH_LEVEL 68
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/api.cc

@@ -8418,7 +8418,7 @@ HeapProfiler* Isolate::GetHeapProfiler() {
 
 CpuProfiler* Isolate::GetCpuProfiler() {
   i::CpuProfiler* cpu_profiler =
-      reinterpret_cast<i::Isolate*>(this)->cpu_profiler();
+      reinterpret_cast<i::Isolate*>(this)->EnsureCpuProfiler();
   return reinterpret_cast<CpuProfiler*>(cpu_profiler);
 }
 
@@ -10138,15 +10138,7 @@ Local<String> CpuProfileNode::GetFunctionName() const {
   const i::CodeEntry* entry = node->entry();
   i::Handle<i::String> name =
       isolate->factory()->InternalizeUtf8String(entry->name());
-  if (!entry->has_name_prefix()) {
-    return ToApiHandle<String>(name);
-  } else {
-    // We do not expect this to fail. Change this if it does.
-    i::Handle<i::String> cons = isolate->factory()->NewConsString(
-        isolate->factory()->InternalizeUtf8String(entry->name_prefix()),
-        name).ToHandleChecked();
-    return ToApiHandle<String>(cons);
-  }
+  return ToApiHandle<String>(name);
 }
 
 int debug::Coverage::BlockData::StartOffset() const { return block_->start; }
@@ -10237,7 +10229,7 @@ const char* CpuProfileNode::GetScriptResourceNameStr() const {
 }
 
 int CpuProfileNode::GetLineNumber() const {
-  return reinterpret_cast<const i::ProfileNode*>(this)->entry()->line_number();
+  return reinterpret_cast<const i::ProfileNode*>(this)->line_number();
 }
 
 
@@ -10370,9 +10362,14 @@ void CpuProfiler::CollectSample() {
 
 void CpuProfiler::StartProfiling(Local<String> title, bool record_samples) {
   reinterpret_cast<i::CpuProfiler*>(this)->StartProfiling(
-      *Utils::OpenHandle(*title), record_samples);
+      *Utils::OpenHandle(*title), record_samples, kLeafNodeLineNumbers);
 }
 
+void CpuProfiler::StartProfiling(Local<String> title, CpuProfilingMode mode,
+                                 bool record_samples) {
+  reinterpret_cast<i::CpuProfiler*>(this)->StartProfiling(
+      *Utils::OpenHandle(*title), record_samples, mode);
+}
 
 CpuProfile* CpuProfiler::StopProfiling(Local<String> title) {
   return reinterpret_cast<CpuProfile*>(

deps/v8/src/code-events.h

@@ -101,7 +101,7 @@ class CodeEventListener {
   virtual void GetterCallbackEvent(Name* name, Address entry_point) = 0;
   virtual void SetterCallbackEvent(Name* name, Address entry_point) = 0;
   virtual void RegExpCodeCreateEvent(AbstractCode* code, String* source) = 0;
-  virtual void CodeMoveEvent(AbstractCode* from, Address to) = 0;
+  virtual void CodeMoveEvent(AbstractCode* from, AbstractCode* to) = 0;
   virtual void SharedFunctionInfoMoveEvent(Address from, Address to) = 0;
   virtual void CodeMovingGCEvent() = 0;
   virtual void CodeDisableOptEvent(AbstractCode* code,
@@ -163,7 +163,7 @@ class CodeEventDispatcher {
   void RegExpCodeCreateEvent(AbstractCode* code, String* source) {
     CODE_EVENT_DISPATCH(RegExpCodeCreateEvent(code, source));
   }
-  void CodeMoveEvent(AbstractCode* from, Address to) {
+  void CodeMoveEvent(AbstractCode* from, AbstractCode* to) {
     CODE_EVENT_DISPATCH(CodeMoveEvent(from, to));
   }
   void SharedFunctionInfoMoveEvent(Address from, Address to) {

deps/v8/src/compilation-info.cc

@@ -51,7 +51,7 @@ CompilationInfo::CompilationInfo(Zone* zone, Isolate* isolate,
   // Collect source positions for optimized code when profiling or if debugger
   // is active, to be able to get more precise source positions at the price of
   // more memory consumption.
-  if (isolate_->NeedsSourcePositionsForProfiling()) {
+  if (isolate_->NeedsDetailedOptimizedCodeLineInfo()) {
     MarkAsSourcePositionsEnabled();
   }
 }

deps/v8/src/flag-definitions.h

@@ -1082,6 +1082,9 @@ DEFINE_BOOL(log_source_code, false, "Log source code.")
 DEFINE_BOOL(prof, false,
             "Log statistical profiling information (implies --log-code).")
 
+DEFINE_BOOL(detailed_line_info, true,
+            "Always generate detailed line information for CPU profiling.")
+
 #if defined(ANDROID)
 // Phones and tablets have processors that are much slower than desktop
 // and laptop computers for which current heuristics are tuned.

deps/v8/src/heap/mark-compact.cc

@@ -1484,7 +1484,7 @@ class ProfilingMigrationObserver final : public MigrationObserver {
                    int size) final {
     if (dest == CODE_SPACE || (dest == OLD_SPACE && dst->IsBytecodeArray())) {
       PROFILE(heap_->isolate(),
-              CodeMoveEvent(AbstractCode::cast(src), dst->address()));
+              CodeMoveEvent(AbstractCode::cast(src), AbstractCode::cast(dst)));
     }
     heap_->OnMoveEvent(dst, src, size);
   }

deps/v8/src/isolate.cc

@@ -2697,7 +2697,6 @@ bool Isolate::Init(StartupDeserializer* des) {
   call_descriptor_data_ =
       new CallInterfaceDescriptorData[CallDescriptors::NUMBER_OF_DESCRIPTORS];
   access_compiler_data_ = new AccessCompilerData();
-  cpu_profiler_ = new CpuProfiler(this);
   heap_profiler_ = new HeapProfiler(heap());
   interpreter_ = new interpreter::Interpreter(this);
   compiler_dispatcher_ =
@@ -2970,6 +2969,10 @@ bool Isolate::use_optimizer() {
          !is_precise_count_code_coverage() && !is_block_count_code_coverage();
 }
 
+bool Isolate::NeedsDetailedOptimizedCodeLineInfo() const {
+  return NeedsSourcePositionsForProfiling() || FLAG_detailed_line_info;
+}
+
 bool Isolate::NeedsSourcePositionsForProfiling() const {
   return FLAG_trace_deopt || FLAG_trace_turbo || FLAG_trace_turbo_graph ||
          FLAG_turbo_profiling || FLAG_perf_prof || is_profiling() ||
@@ -3694,6 +3697,13 @@ void Isolate::PrintWithTimestamp(const char* format, ...) {
   va_end(arguments);
 }
 
+CpuProfiler* Isolate::EnsureCpuProfiler() {
+  if (!cpu_profiler_) {
+    cpu_profiler_ = new CpuProfiler(this);
+  }
+  return cpu_profiler_;
+}
+
 bool StackLimitCheck::JsHasOverflowed(uintptr_t gap) const {
   StackGuard* stack_guard = isolate_->stack_guard();
 #ifdef USE_SIMULATOR

deps/v8/src/isolate.h

@@ -1019,6 +1019,8 @@ class Isolate {
 
   bool NeedsSourcePositionsForProfiling() const;
 
+  bool NeedsDetailedOptimizedCodeLineInfo() const;
+
   bool is_best_effort_code_coverage() const {
     return code_coverage_mode() == debug::Coverage::kBestEffort;
   }
@@ -1449,7 +1451,7 @@ class Isolate {
 
   // TODO(alph): Remove along with the deprecated GetCpuProfiler().
   friend v8::CpuProfiler* v8::Isolate::GetCpuProfiler();
-  CpuProfiler* cpu_profiler() const { return cpu_profiler_; }
+  CpuProfiler* EnsureCpuProfiler();
 
   base::Atomic32 id_;
   EntryStackItem* entry_stack_;

deps/v8/src/log.cc

@@ -22,7 +22,6 @@
 #include "src/log-utils.h"
 #include "src/macro-assembler.h"
 #include "src/perf-jit.h"
-#include "src/profiler/profiler-listener.h"
 #include "src/profiler/tick-sample.h"
 #include "src/runtime-profiler.h"
 #include "src/source-position-table.h"
@@ -218,7 +217,7 @@ class PerfBasicLogger : public CodeEventLogger {
   PerfBasicLogger();
   ~PerfBasicLogger() override;
 
-  void CodeMoveEvent(AbstractCode* from, Address to) override {}
+  void CodeMoveEvent(AbstractCode* from, AbstractCode* to) override {}
   void CodeDisableOptEvent(AbstractCode* code,
                            SharedFunctionInfo* shared) override {}
 
@@ -287,7 +286,7 @@ class LowLevelLogger : public CodeEventLogger {
   explicit LowLevelLogger(const char* file_name);
   ~LowLevelLogger() override;
 
-  void CodeMoveEvent(AbstractCode* from, Address to) override;
+  void CodeMoveEvent(AbstractCode* from, AbstractCode* to) override;
   void CodeDisableOptEvent(AbstractCode* code,
                            SharedFunctionInfo* shared) override {}
   void SnapshotPositionEvent(HeapObject* obj, int pos);
@@ -393,11 +392,10 @@ void LowLevelLogger::LogRecordedBuffer(AbstractCode* code, SharedFunctionInfo*,
       code->instruction_size());
 }
 
-void LowLevelLogger::CodeMoveEvent(AbstractCode* from, Address to) {
+void LowLevelLogger::CodeMoveEvent(AbstractCode* from, AbstractCode* to) {
   CodeMoveStruct event;
   event.from_address = from->instruction_start();
-  size_t header_size = from->instruction_start() - from->address();
-  event.to_address = to + header_size;
+  event.to_address = to->instruction_start();
   LogWriteStruct(event);
 }
 
@@ -419,7 +417,7 @@ class JitLogger : public CodeEventLogger {
  public:
   explicit JitLogger(JitCodeEventHandler code_event_handler);
 
-  void CodeMoveEvent(AbstractCode* from, Address to) override;
+  void CodeMoveEvent(AbstractCode* from, AbstractCode* to) override;
   void CodeDisableOptEvent(AbstractCode* code,
                            SharedFunctionInfo* shared) override {}
   void AddCodeLinePosInfoEvent(void* jit_handler_data, int pc_offset,
@@ -460,19 +458,14 @@ void JitLogger::LogRecordedBuffer(AbstractCode* code,
   code_event_handler_(&event);
 }
 
-void JitLogger::CodeMoveEvent(AbstractCode* from, Address to) {
+void JitLogger::CodeMoveEvent(AbstractCode* from, AbstractCode* to) {
   base::LockGuard<base::Mutex> guard(&logger_mutex_);
 
   JitCodeEvent event;
   event.type = JitCodeEvent::CODE_MOVED;
-  event.code_start = from->instruction_start();
+  event.code_start = reinterpret_cast<void*>(from->instruction_start());
   event.code_len = from->instruction_size();
-
-  // Calculate the header size.
-  const size_t header_size = from->instruction_start() - from->address();
-
-  // Calculate the new start address of the instructions.
-  event.new_code_start = to + header_size;
+  event.new_code_start = reinterpret_cast<void*>(to->instruction_start());
 
   code_event_handler_(&event);
 }
@@ -739,7 +732,6 @@ Logger::Logger(Isolate* isolate)
       perf_jit_logger_(NULL),
       ll_logger_(NULL),
       jit_logger_(NULL),
-      listeners_(5),
       is_initialized_(false) {}
 
 Logger::~Logger() {
@@ -1297,9 +1289,10 @@ void Logger::RegExpCodeCreateEvent(AbstractCode* code, String* source) {
   msg.WriteToLogFile();
 }
 
-void Logger::CodeMoveEvent(AbstractCode* from, Address to) {
+void Logger::CodeMoveEvent(AbstractCode* from, AbstractCode* to) {
   if (!is_logging_code_events()) return;
-  MoveEventInternal(CodeEventListener::CODE_MOVE_EVENT, from->address(), to);
+  MoveEventInternal(CodeEventListener::CODE_MOVE_EVENT, from->address(),
+                    to->address());
 }
 
 void Logger::CodeLinePosInfoRecordEvent(AbstractCode* code,
@@ -1876,8 +1869,6 @@ bool Logger::SetUp(Isolate* isolate) {
     profiler_->Engage();
   }
 
-  profiler_listener_.reset();
-
   if (is_logging_) {
     addCodeEventListener(this);
   }
@@ -1905,19 +1896,6 @@ void Logger::SetCodeEventHandler(uint32_t options,
   }
 }
 
-void Logger::SetUpProfilerListener() {
-  if (!is_initialized_) return;
-  if (profiler_listener_.get() == nullptr) {
-    profiler_listener_.reset(new ProfilerListener(isolate_));
-  }
-  addCodeEventListener(profiler_listener_.get());
-}
-
-void Logger::TearDownProfilerListener() {
-  if (profiler_listener_->HasObservers()) return;
-  removeCodeEventListener(profiler_listener_.get());
-}
-
 sampler::Sampler* Logger::sampler() {
   return ticker_;
 }
@@ -1961,10 +1939,6 @@ FILE* Logger::TearDown() {
     jit_logger_ = NULL;
   }
 
-  if (profiler_listener_.get() != nullptr) {
-    removeCodeEventListener(profiler_listener_.get());
-  }
-
   return log_->Close();
 }