X64: Implement debugger hooks.

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index 18536f5c7a9fe6cba3403d4cf98546db41c4143e..1eaba68aae8c3870a0c60e259fb192941cfb165b 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -1459,7 +1459,8 @@ void Debug::SetAfterBreakTarget(JavaScriptFrame* frame) {
   RelocIterator it(debug_info->code());
   while (!it.done()) {
     if (RelocInfo::IsJSReturn(it.rinfo()->rmode())) {
-      at_js_exit = it.rinfo()->pc() == addr - 1;
+      at_js_exit =
+          (it.rinfo()->pc() == addr - Assembler::kReturnAddrPatchPrefixSize);
     }
     it.next();
   }
@@ -1478,7 +1479,8 @@ void Debug::SetAfterBreakTarget(JavaScriptFrame* frame) {
     }
 
     // Move one byte back to where the call instruction was placed.

[Søren Thygesen Gjesse, 2009/08/18 13:10:44]

Comment out of sync with code.

[Lasse Reichstein, 2009/08/19 07:07:55]

Fixed

-    thread_local_.after_break_target_ = addr - 1;
+    thread_local_.after_break_target_ =
+        addr - Assembler::kReturnAddrPatchPrefixSize;
   } else {
     // Check if there still is a debug break call at the target address. If the
     // break point has been removed it will have disappeared. If it have