Revert of Rebase GDBJIT interface solely on JITCodeEvent

src/gdb-jit.h

Index: src/gdb-jit.h
diff --git a/src/gdb-jit.h b/src/gdb-jit.h
index 45382702da4a9fea2df09632d1437c7618871c95..14536cf0b38e287937cbad1c7fcef697082bcc0a 100644
--- a/src/gdb-jit.h
+++ b/src/gdb-jit.h
@@ -5,35 +5,50 @@
 #ifndef V8_GDB_JIT_H_
 #define V8_GDB_JIT_H_
 
+#include "src/allocation.h"
+
+//
+// Basic implementation of GDB JIT Interface client.
+// GBD JIT Interface is supported in GDB 7.0 and above.
+// Currently on x64 and ia32 architectures and Linux OS are supported.
+//
+
+#ifdef ENABLE_GDB_JIT_INTERFACE
 #include "src/v8.h"
 
-//
-// GDB has two ways of interacting with JIT code.  With the "JIT compilation
-// interface", V8 can tell GDB when it emits JIT code.  Unfortunately to do so,
-// it has to create platform-native object files, possibly with platform-native
-// debugging information.  Currently only ELF and Mach-O are supported, which
-// limits this interface to Linux and Mac OS.  This JIT compilation interface
-// was introduced in GDB 7.0.  V8 support can be enabled with the --gdbjit flag.
-//
-// The other way that GDB can know about V8 code is via the "custom JIT reader"
-// interface, in which a GDB extension parses V8's private data to determine the
-// function, file, and line of a JIT frame, and how to unwind those frames.
-// This interface was introduced in GDB 7.6.  This interface still relies on V8
-// to register its code via the JIT compilation interface, but doesn't require
-// that V8 create ELF images.  Support will be added for this interface in the
-// future.
-//
+#include "src/factory.h"
 
 namespace v8 {
 namespace internal {
-namespace GDBJITInterface {
-#ifdef ENABLE_GDB_JIT_INTERFACE
-// JitCodeEventHandler that creates ELF/Mach-O objects and registers them with
-// GDB.
-void EventHandler(const v8::JitCodeEvent* event);
+
+class CompilationInfo;
+
+class GDBJITInterface: public AllStatic {
+ public:
+  enum CodeTag { NON_FUNCTION, FUNCTION };
+
+  // Main entry point into GDB JIT realized as a JitCodeEventHandler.
+  static void EventHandler(const v8::JitCodeEvent* event);
+
+  static void AddCode(Handle<Name> name,
+                      Handle<Script> script,
+                      Handle<Code> code,
+                      CompilationInfo* info);
+
+  static void RemoveCodeRange(Address start, Address end);
+
+ private:
+  static void AddCode(const char* name, Code* code, CodeTag tag, Script* script,
+                      CompilationInfo* info);
+
+  static void RemoveCode(Code* code);
+};
+
+#define GDBJIT(action) GDBJITInterface::action
+
+} }   // namespace v8::internal
+#else
+#define GDBJIT(action) ((void) 0)
 #endif
-}  // namespace GDBJITInterface
-}  // namespace internal
-}  // namespace v8
 
 #endif