Add basic C++ implementation of CPU profiler.

src/cpu-profiler.cc

Index: src/cpu-profiler.cc
diff --git a/src/cpu-profiler.cc b/src/cpu-profiler.cc
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+++ b/src/cpu-profiler.cc
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+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#include "cpu-profiler-inl.h"
+
+namespace v8 {
+namespace internal {
+
+
+static const int kEventsBufferSize = 256*KB;
+static const int kTickSamplesBufferChunkSize = 64*KB;
+static const int kTickSamplesBufferChunksCount = 16;
+
+
+ProfilerEventsProcessor::ProfilerEventsProcessor(ProfileGenerator* generator)
+    : generator_(generator),
+      running_(false),
+      events_buffer_(kEventsBufferSize),
+      ticks_buffer_(sizeof(TickSampleEventRecord),
+                    kTickSamplesBufferChunkSize,
+                    kTickSamplesBufferChunksCount),
+      enqueue_order_(0) { }
+
+
+void ProfilerEventsProcessor::CodeCreateEvent(Logger::LogEventsAndTags tag,
+                                              String* name,
+                                              String* resource_name,
+                                              int line_number,
+                                              Address start,
+                                              unsigned size) {
+  CodeEventsContainer evt_rec;
+  CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
+  rec->type = CodeEventRecord::CODE_CREATION;
+  rec->order = ++enqueue_order_;
+  rec->start = start;
+  rec->entry = generator_->NewCodeEntry(tag, name, resource_name, line_number);
+  rec->size = size;
+  events_buffer_.Enqueue(evt_rec);
+}
+
+
+void ProfilerEventsProcessor::CodeCreateEvent(Logger::LogEventsAndTags tag,
+                                              const char* name,
+                                              Address start,
+                                              unsigned size) {
+  CodeEventsContainer evt_rec;
+  CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
+  rec->type = CodeEventRecord::CODE_CREATION;
+  rec->order = ++enqueue_order_;
+  rec->start = start;
+  rec->entry = generator_->NewCodeEntry(tag, name);
+  rec->size = size;
+  events_buffer_.Enqueue(evt_rec);
+}
+
+
+void ProfilerEventsProcessor::CodeCreateEvent(Logger::LogEventsAndTags tag,
+                                              int args_count,
+                                              Address start,
+                                              unsigned size) {
+  CodeEventsContainer evt_rec;
+  CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
+  rec->type = CodeEventRecord::CODE_CREATION;
+  rec->order = ++enqueue_order_;
+  rec->start = start;
+  rec->entry = generator_->NewCodeEntry(tag, args_count);
+  rec->size = size;
+  events_buffer_.Enqueue(evt_rec);
+}
+
+
+void ProfilerEventsProcessor::CodeMoveEvent(Address from, Address to) {
+  CodeEventsContainer evt_rec;
+  CodeMoveEventRecord* rec = &evt_rec.CodeMoveEventRecord_;
+  rec->type = CodeEventRecord::CODE_MOVE;
+  rec->order = ++enqueue_order_;
+  rec->from = from;
+  rec->to = to;
+  events_buffer_.Enqueue(evt_rec);
+}
+
+
+void ProfilerEventsProcessor::CodeDeleteEvent(Address from) {
+  CodeEventsContainer evt_rec;
+  CodeDeleteEventRecord* rec = &evt_rec.CodeDeleteEventRecord_;
+  rec->type = CodeEventRecord::CODE_DELETE;
+  rec->order = ++enqueue_order_;
+  rec->start = from;
+  events_buffer_.Enqueue(evt_rec);
+}
+
+
+void ProfilerEventsProcessor::FunctionCreateEvent(Address alias,
+                                                  Address start) {
+  CodeEventsContainer evt_rec;
+  CodeAliasEventRecord* rec = &evt_rec.CodeAliasEventRecord_;
+  rec->type = CodeEventRecord::CODE_ALIAS;
+  rec->order = ++enqueue_order_;
+  rec->alias = alias;
+  rec->start = start;
+  events_buffer_.Enqueue(evt_rec);
+}
+
+
+void ProfilerEventsProcessor::FunctionMoveEvent(Address from, Address to) {
+  CodeMoveEvent(from, to);
+}
+
+
+void ProfilerEventsProcessor::FunctionDeleteEvent(Address from) {
+  CodeDeleteEvent(from);
+}
+
+
+bool ProfilerEventsProcessor::ProcessCodeEvent(unsigned* dequeue_order) {
+  if (!events_buffer_.IsEmpty()) {
+    CodeEventsContainer record;
+    events_buffer_.Dequeue(&record);
+    switch (record.generic.type) {
+#define PROFILER_TYPE_CASE(type, clss)                          \
+      case CodeEventRecord::type:                               \
+        record.clss##_.UpdateCodeMap(generator_->code_map());   \
+        break;
+
+      CODE_EVENTS_TYPE_LIST(PROFILER_TYPE_CASE)
+
+#undef PROFILER_TYPE_CASE
+      default: return true;  // Skip record.
+    }
+    *dequeue_order = record.generic.order;
+    return true;
+  }
+  return false;
+}
+
+
+bool ProfilerEventsProcessor::ProcessTicks(unsigned dequeue_order) {
+  while (true) {
+    const TickSampleEventRecord* rec =
+        reinterpret_cast<TickSampleEventRecord*>(ticks_buffer_.StartDequeue());
+    if (rec == NULL) return false;
+    if (rec->order == dequeue_order) {
+      generator_->RecordTickSample(rec->sample);
+      ticks_buffer_.FinishDequeue();
+    } else {
+      return true;
+    }
+  }
+}
+
+
+void ProfilerEventsProcessor::Run() {
+  ticks_buffer_.SetUpConsumer();
+  unsigned dequeue_order = 0;
+  running_ = true;
+
+  while (running_) {
+    // Process ticks until we have any.
+    if (ProcessTicks(dequeue_order)) {
+      // All ticks of the current dequeue_order are processed,
+      // proceed to the next code event.
+      ProcessCodeEvent(&dequeue_order);
+    }
+    YieldCPU();
+  }
+
+  // Process remaining tick events.
+  ticks_buffer_.FlushResidualRecords();
+  // Perform processing until we have tick events, skip remaining code events.
+  while (ProcessTicks(dequeue_order) && ProcessCodeEvent(&dequeue_order)) { }
+  ticks_buffer_.TearDownConsumer();
+}
+
+
+} }  // namespace v8::internal