Add a new API V8::SetJitCodeEventHandler to push code name and location to users such as profilers.

src/code-events.h

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2012 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_CODE_H_
-#define V8_CODE_H_
+#ifndef V8_CODE_EVENTS_H_
+#define V8_CODE_EVENTS_H_
 
 #include "allocation.h"
 
 namespace v8 {
 namespace internal {
 
+class CompilationInfo;
 
-// Wrapper class for passing expected and actual parameter counts as
-// either registers or immediate values. Used to make sure that the
-// caller provides exactly the expected number of parameters to the
-// callee.
-class ParameterCount BASE_EMBEDDED {
+class CodeEvents : public AllStatic {
  public:
-  explicit ParameterCount(Register reg)
-      : reg_(reg), immediate_(0) { }
-  explicit ParameterCount(int immediate)
-      : reg_(no_reg), immediate_(immediate) { }
-
-  bool is_reg() const { return !reg_.is(no_reg); }
-  bool is_immediate() const { return !is_reg(); }
-
-  Register reg() const {
-    ASSERT(is_reg());
-    return reg_;
-  }
-  int immediate() const {
-    ASSERT(is_immediate());
-    return immediate_;
+  static bool is_active() {
+    return event_handler_ != NULL;
   }
 
+  static void set_handler(JitCodeEventHandler event_handler) {
+    event_handler_ = event_handler;
+  }
+
+  // Code added notifications.
+  static void AddCode(const char* name,
+                      Code* code,
+                      Script* script,
+                      CompilationInfo* info);
+  static void AddCode(Handle<String> name,
+                      Handle<Script> script,
+                      Handle<Code> code,
+                      CompilationInfo* info);
+  static void AddCode(String* name, Code* code);
+  static void AddCode(const char* name, Code* code);
+  static void AddCode(Code* code);
+
+  // Code moved notification.
+  static void MoveCode(Address src, Address dst);
+
+  // Code removed notification.
+  static void RemoveCode(Code* code);
+
  private:
-  const Register reg_;
-  const int immediate_;
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount);
+  static JitCodeEventHandler event_handler_;
 };
 
+#define JIT_CODE_EVENT(action) \
+  do { if (CodeEvents::is_active()) CodeEvents::action; } while(0)
 
 } }  // namespace v8::internal
 
-#endif  // V8_CODE_H_
+#endif  // V8_CODE_EVENTS_H_