Add basic C++ implementation of CPU profiler.

src/cpu-profiler.h

+// 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.
+
+#ifndef V8_CPU_PROFILER_H_
+#define V8_CPU_PROFILER_H_
+
+#include "circular-queue.h"
+#include "profile-generator.h"
+
+namespace v8 {
+namespace internal {
+
+
+#define CODE_EVENTS_TYPE_LIST(V)                \
+  V(CODE_CREATION, CodeCreateEventRecord)       \
+  V(CODE_MOVE,     CodeMoveEventRecord)         \
+  V(CODE_DELETE,   CodeDeleteEventRecord)       \
+  V(CODE_ALIAS,    CodeAliasEventRecord)
+
+
+class CodeEventRecord {
+ public:
+#define DECLARE_TYPE(type, ignore) type,
+  enum Type {
+    NONE = 0,
+    CODE_EVENTS_TYPE_LIST(DECLARE_TYPE)
+    NUMBER_OF_TYPES
+  };
+#undef DECLARE_TYPE
+
+  Type type;
+  unsigned order;
+};
+
+
+class CodeCreateEventRecord : public CodeEventRecord {
+ public:
+  Address start;
+  CodeEntry* entry;
+  unsigned size;
+
+  INLINE(void UpdateCodeMap(CodeMap* code_map)) {
+    code_map->AddCode(start, entry, size);
+  }
+};
+
+
+class CodeMoveEventRecord : public CodeEventRecord {
+ public:
+  Address from;
+  Address to;
+
+  INLINE(void UpdateCodeMap(CodeMap* code_map)) {
+    code_map->MoveCode(from, to);
+  }
+};
+
+
+class CodeDeleteEventRecord : public CodeEventRecord {
+ public:
+  Address start;
+
+  INLINE(void UpdateCodeMap(CodeMap* code_map)) {
+    code_map->DeleteCode(start);
+  }
+};
+
+
+class CodeAliasEventRecord : public CodeEventRecord {
+ public:
+  Address alias;
+  Address start;
+
+  INLINE(void UpdateCodeMap(CodeMap* code_map)) {
+    code_map->AddAlias(alias, start);
+  }
+};
+
+
+class TickSampleEventRecord {
+ public:
+  // In memory, the first machine word of a TickSampleEventRecord will be the
+  // first entry of TickSample, that is -- a program counter field.
+  // TickSample is put first, because 'order' can become equal to
+  // SamplingCircularQueue::kClear, while program counter can't.
+  TickSample sample;
+  unsigned order;
+
+ private:
+  // Disable instantiation.
+  TickSampleEventRecord();
+
+  DISALLOW_COPY_AND_ASSIGN(TickSampleEventRecord);
+};
+
+
+// This class implements both the profile events processor thread and
+// methods called by event producers: VM and stack sampler threads.
+class ProfilerEventsProcessor : public Thread {
+ public:
+  explicit ProfilerEventsProcessor(ProfileGenerator* generator);
+  virtual ~ProfilerEventsProcessor() { }
+
+  // Thread control.
+  virtual void Run();
+  inline void Stop() { running_ = false; }
+
+  // Events adding methods. Called by VM threads.
+  void CodeCreateEvent(Logger::LogEventsAndTags tag,
+                       String* name,
+                       String* resource_name, int line_number,
+                       Address start, unsigned size);
+  void CodeCreateEvent(Logger::LogEventsAndTags tag,
+                       const char* name,
+                       Address start, unsigned size);
+  void CodeCreateEvent(Logger::LogEventsAndTags tag,
+                       int args_count,
+                       Address start, unsigned size);
+  void CodeMoveEvent(Address from, Address to);
+  void CodeDeleteEvent(Address from);
+  void FunctionCreateEvent(Address alias, Address start);
+  void FunctionMoveEvent(Address from, Address to);
+  void FunctionDeleteEvent(Address from);
+
+  // Tick sampler registration. Called by sampler thread or signal handler.
+  inline void SetUpSamplesProducer() { ticks_buffer_.SetUpProducer(); }
+  // Tick sample events are filled directly in the buffer of the circular
+  // queue (because the structure is of fixed width, but usually not all
+  // stack frame entries are filled.) This method returns a pointer to the
+  // next record of the buffer.
+  INLINE(TickSample* TickSampleEvent());
+  inline void TearDownSamplesProducer() { ticks_buffer_.TearDownProducer(); }
+
+ private:
+  union CodeEventsContainer {
+    CodeEventRecord generic;
+#define DECLARE_CLASS(ignore, type) type type##_;
+    CODE_EVENTS_TYPE_LIST(DECLARE_CLASS)
+#undef DECLARE_TYPE
+  };
+
+  // Called from events processing thread (Run() method.)
+  bool ProcessCodeEvent(unsigned* dequeue_order);
+  bool ProcessTicks(unsigned dequeue_order);
+
+  ProfileGenerator* generator_;
+  bool running_;
+  CircularQueue<CodeEventsContainer> events_buffer_;
+  SamplingCircularQueue ticks_buffer_;
+  unsigned enqueue_order_;
+};
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_CPU_PROFILER_H_