From 223e831acf8ac845e3d71c8e9edca582a913648f Mon Sep 17 00:00:00 2001
From: "yangguo@chromium.org"
 <yangguo@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Wed, 11 Jun 2014 13:40:18 +0000
Subject: [PATCH] Ignore live_edit_ flag when when dealing with LiveEdit in a
 debug break.

LiveEdit maybe disabled when we enter the break and again when we
leave it, but enabled in between.

TEST=https://codereview.chromium.org/329533002
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/325183003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21770 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/debug.cc    | 13 +++++--------
 src/debug.h     |  1 +
 src/liveedit.cc | 18 ++++++++++++------
 src/liveedit.h  |  4 +++-
 4 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/src/debug.cc b/src/debug.cc
index 03c9197..a710f0b 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -886,9 +886,8 @@ void Debug::Break(Arguments args, JavaScriptFrame* frame) {
   HandleScope scope(isolate_);
   ASSERT(args.length() == 0);
 
-  if (live_edit_enabled()) {
-    thread_local_.frame_drop_mode_ = LiveEdit::FRAMES_UNTOUCHED;
-  }
+  // Initialize LiveEdit.
+  LiveEdit::InitializeThreadLocal(this);
 
   // Just continue if breaks are disabled or debugger cannot be loaded.
   if (break_disabled_) return;
@@ -2307,11 +2306,9 @@ void Debug::RemoveDebugInfo(Handle<DebugInfo> debug_info) {
 
 
 void Debug::SetAfterBreakTarget(JavaScriptFrame* frame) {
-  if (live_edit_enabled()) {
-    after_break_target_ =
-        LiveEdit::AfterBreakTarget(thread_local_.frame_drop_mode_, isolate_);
-    if (after_break_target_ != NULL) return;  // LiveEdit did the job.
-  }
+  after_break_target_ = NULL;
+
+  if (LiveEdit::SetAfterBreakTarget(this)) return;  // LiveEdit did the job.
 
   HandleScope scope(isolate_);
   PrepareForBreakPoints();
diff --git a/src/debug.h b/src/debug.h
index 5224d1c..7f9b1a2 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -674,6 +674,7 @@ class Debug {
   friend class Isolate;
   friend class DebugScope;
   friend class DisableBreak;
+  friend class LiveEdit;
   friend class SuppressDebug;
 
   friend Handle<FixedArray> GetDebuggedFunctions();  // In test-debug.cc
diff --git a/src/liveedit.cc b/src/liveedit.cc
index d802d0d..05bd550 100644
--- a/src/liveedit.cc
+++ b/src/liveedit.cc
@@ -805,11 +805,17 @@ class FunctionInfoListener {
 };
 
 
-Address LiveEdit::AfterBreakTarget(FrameDropMode mode, Isolate* isolate) {
+void LiveEdit::InitializeThreadLocal(Debug* debug) {
+  debug->thread_local_.frame_drop_mode_ = LiveEdit::FRAMES_UNTOUCHED;
+}
+
+
+bool LiveEdit::SetAfterBreakTarget(Debug* debug) {
   Code* code = NULL;
-  switch (mode) {
+  Isolate* isolate = debug->isolate_;
+  switch (debug->thread_local_.frame_drop_mode_) {
     case FRAMES_UNTOUCHED:
-      break;
+      return false;
     case FRAME_DROPPED_IN_IC_CALL:
       // We must have been calling IC stub. Do not go there anymore.
       code = isolate->builtins()->builtin(Builtins::kPlainReturn_LiveEdit);
@@ -821,7 +827,7 @@ Address LiveEdit::AfterBreakTarget(FrameDropMode mode, Isolate* isolate) {
       break;
     case FRAME_DROPPED_IN_DIRECT_CALL:
       // Nothing to do, after_break_target is not used here.
-      break;
+      return true;
     case FRAME_DROPPED_IN_RETURN_CALL:
       code = isolate->builtins()->builtin(Builtins::kFrameDropper_LiveEdit);
       break;
@@ -829,8 +835,8 @@ Address LiveEdit::AfterBreakTarget(FrameDropMode mode, Isolate* isolate) {
       UNREACHABLE();
       break;
   }
-  if (code == NULL) return NULL;
-  return code->entry();
+  debug->after_break_target_ = code->entry();
+  return true;
 }
 
 
diff --git a/src/liveedit.h b/src/liveedit.h
index 2293d1c..3465d88 100644
--- a/src/liveedit.h
+++ b/src/liveedit.h
@@ -74,7 +74,9 @@ class LiveEdit : AllStatic {
     CURRENTLY_SET_MODE
   };
 
-  static Address AfterBreakTarget(FrameDropMode mode, Isolate* isolate);
+  static void InitializeThreadLocal(Debug* debug);
+
+  static bool SetAfterBreakTarget(Debug* debug);
 
   MUST_USE_RESULT static MaybeHandle<JSArray> GatherCompileInfo(
       Handle<Script> script,
-- 
2.7.4