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

src/code-events.h

Index: src/code-events.h
diff --git a/src/code.h b/src/code-events.h
similarity index 58%
copy from src/code.h
copy to src/code-events.h
index 766c932e0f6182697670996180f5f66829751245..09e7711739e8a1b6d524772f40e0dc8255c2d00c 100644
--- a/src/code.h
+++ b/src/code-events.h
@@ -1,4 +1,4 @@
-// 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:
@@ -25,46 +25,52 @@
 // (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_;
+  static bool is_active() {
+    return event_handler_ != NULL;
   }
-  int immediate() const {
-    ASSERT(is_immediate());
-    return immediate_;
+
+  static void set_handler(JitCodeEventHandler event_handler) {
+    event_handler_ = event_handler;
   }
 
- private:
-  const Register reg_;
-  const int immediate_;
+  // 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);
 
-  DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount);
+  // Code moved notification.
+  static void MoveCode(Address src, Address dst);
+
+  // Code removed notification.
+  static void RemoveCode(Code* code);
+
+ private:
+  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_