Roll back all step-in-fix-related changes

Review URL: http://codereview.chromium.org/3012035

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5154 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/debug-arm.cc

@@ -296,10 +296,9 @@ void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
 #undef __
 
 
-Object** Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
-                                       Handle<Code> code) {
+void Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
+                                   Handle<Code> code) {
   UNREACHABLE();
-  return NULL;
 }
 const int Debug::kFrameDropperFrameSize = -1;
 

src/debug-debugger.js

@@ -2115,10 +2115,6 @@ DebugCommandProcessor.prototype.changeLiveRequest_ = function(request, response)
   var result_description = Debug.LiveEdit.SetScriptSource(the_script,
       new_source, preview_only, change_log);
   response.body = {change_log: change_log, result: result_description};
-  
-  if (!preview_only && !this.running_ && result_description.stack_modified) {
-    response.body.stepin_recommended = true;
-  }
 };
 
 

src/debug.cc

@@ -1224,42 +1224,36 @@ void Debug::PrepareStep(StepAction step_action, int step_count) {
   it.FindBreakLocationFromAddress(frame->pc());
 
   // Compute whether or not the target is a call target.
+  bool is_call_target = false;
   bool is_load_or_store = false;
   bool is_inline_cache_stub = false;
-  bool is_at_restarted_function = false;
   Handle<Code> call_function_stub;
+  if (RelocInfo::IsCodeTarget(it.rinfo()->rmode())) {
+    Address target = it.rinfo()->target_address();
+    Code* code = Code::GetCodeFromTargetAddress(target);
+    if (code->is_call_stub() || code->is_keyed_call_stub()) {
+      is_call_target = true;
+    }
+    if (code->is_inline_cache_stub()) {
+      is_inline_cache_stub = true;
+      is_load_or_store = !is_call_target;
+    }
 
-  if (thread_local_.restarter_frame_function_pointer_ == NULL) {
-    if (RelocInfo::IsCodeTarget(it.rinfo()->rmode())) {
-      bool is_call_target = false;
-      Address target = it.rinfo()->target_address();
-      Code* code = Code::GetCodeFromTargetAddress(target);
-      if (code->is_call_stub() || code->is_keyed_call_stub()) {
-        is_call_target = true;
-      }
-      if (code->is_inline_cache_stub()) {
-        is_inline_cache_stub = true;
-        is_load_or_store = !is_call_target;
-      }
-
-      // Check if target code is CallFunction stub.
-      Code* maybe_call_function_stub = code;
-      // If there is a breakpoint at this line look at the original code to
-      // check if it is a CallFunction stub.
-      if (it.IsDebugBreak()) {
-        Address original_target = it.original_rinfo()->target_address();
-        maybe_call_function_stub =
-            Code::GetCodeFromTargetAddress(original_target);
-      }
-      if (maybe_call_function_stub->kind() == Code::STUB &&
-          maybe_call_function_stub->major_key() == CodeStub::CallFunction) {
-        // Save reference to the code as we may need it to find out arguments
-        // count for 'step in' later.
-        call_function_stub = Handle<Code>(maybe_call_function_stub);
-      }
+    // Check if target code is CallFunction stub.
+    Code* maybe_call_function_stub = code;
+    // If there is a breakpoint at this line look at the original code to
+    // check if it is a CallFunction stub.
+    if (it.IsDebugBreak()) {
+      Address original_target = it.original_rinfo()->target_address();
+      maybe_call_function_stub =
+          Code::GetCodeFromTargetAddress(original_target);
+    }
+    if (maybe_call_function_stub->kind() == Code::STUB &&
+        maybe_call_function_stub->major_key() == CodeStub::CallFunction) {
+      // Save reference to the code as we may need it to find out arguments
+      // count for 'step in' later.
+      call_function_stub = Handle<Code>(maybe_call_function_stub);
     }
-  } else {
-    is_at_restarted_function = true;
   }
 
   // If this is the last break code target step out is the only possibility.
@@ -1288,7 +1282,7 @@ void Debug::PrepareStep(StepAction step_action, int step_count) {
       ActivateStepOut(frames_it.frame());
     }
   } else if (!(is_inline_cache_stub || RelocInfo::IsConstructCall(it.rmode()) ||
-               !call_function_stub.is_null() || is_at_restarted_function)
+               !call_function_stub.is_null())
              || step_action == StepNext || step_action == StepMin) {
     // Step next or step min.
 
@@ -1300,18 +1294,9 @@ void Debug::PrepareStep(StepAction step_action, int step_count) {
         debug_info->code()->SourceStatementPosition(frame->pc());
     thread_local_.last_fp_ = frame->fp();
   } else {
-    // If there's restarter frame on top of the stack, just get the pointer
-    // to function which is going to be restarted.
-    if (is_at_restarted_function) {
-      Handle<JSFunction> restarted_function(
-          JSFunction::cast(*thread_local_.restarter_frame_function_pointer_));
-      Handle<SharedFunctionInfo> restarted_shared(
-          restarted_function->shared());
-      FloodWithOneShot(restarted_shared);
-    } else if (!call_function_stub.is_null()) {
-      // If it's CallFunction stub ensure target function is compiled and flood
-      // it with one shot breakpoints.
-
+    // If it's CallFunction stub ensure target function is compiled and flood
+    // it with one shot breakpoints.
+    if (!call_function_stub.is_null()) {
       // Find out number of arguments from the stub minor key.
       // Reverse lookup required as the minor key cannot be retrieved
       // from the code object.
@@ -1782,12 +1767,9 @@ bool Debug::IsBreakAtReturn(JavaScriptFrame* frame) {
 
 
 void Debug::FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
-                                  FrameDropMode mode,
-                                  Object** restarter_frame_function_pointer) {
+                                  FrameDropMode mode) {
   thread_local_.frame_drop_mode_ = mode;
   thread_local_.break_frame_id_ = new_break_frame_id;
-  thread_local_.restarter_frame_function_pointer_ =
-      restarter_frame_function_pointer;
 }
 
 

src/debug.h

@@ -332,7 +332,6 @@ class Debug {
     k_after_break_target_address,
     k_debug_break_return_address,
     k_debug_break_slot_address,
-    k_restarter_frame_function_pointer,
     k_register_address
   };
 
@@ -340,10 +339,6 @@ class Debug {
   static Address* after_break_target_address() {
     return reinterpret_cast<Address*>(&thread_local_.after_break_target_);
   }
-  static Address* restarter_frame_function_pointer_address() {
-    Object*** address = &thread_local_.restarter_frame_function_pointer_;
-    return reinterpret_cast<Address*>(address);
-  }
 
   // Support for saving/restoring registers when handling debug break calls.
   static Object** register_address(int r) {
@@ -420,22 +415,10 @@ class Debug {
   };
 
   static void FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
-                                    FrameDropMode mode,
-                                    Object** restarter_frame_function_pointer);
-
-  // Initializes an artificial stack frame. The data it contains is used for:
-  //  a. successful work of frame dropper code which eventually gets control,
-  //  b. being compatible with regular stack structure for various stack
-  //     iterators.
-  // Returns address of stack allocated pointer to restarted function,
-  // the value that is called 'restarter_frame_function_pointer'. The value
-  // at this address (possibly updated by GC) may be used later when preparing
-  // 'step in' operation.
-  // The implementation is architecture-specific.
-  // TODO(LiveEdit): consider reviewing it as architecture-independent.
-  static Object** SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
-                                         Handle<Code> code);
+                                    FrameDropMode mode);
 
+  static void SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
+                                     Handle<Code> code);
   static const int kFrameDropperFrameSize;
 
  private:
@@ -512,11 +495,6 @@ class Debug {
 
     // Pending interrupts scheduled while debugging.
     int pending_interrupts_;
-
-    // When restarter frame is on stack, stores the address
-    // of the pointer to function being restarted. Otherwise (most of the time)
-    // stores NULL. This pointer is used with 'step in' implementation.
-    Object** restarter_frame_function_pointer_;
   };
 
   // Storage location for registers when handling debug break calls
@@ -960,10 +938,6 @@ class Debug_Address {
     return Debug_Address(Debug::k_debug_break_return_address);
   }
 
-  static Debug_Address RestarterFrameFunctionPointer() {
-    return Debug_Address(Debug::k_restarter_frame_function_pointer);
-  }
-
   static Debug_Address Register(int reg) {
     return Debug_Address(Debug::k_register_address, reg);
   }
@@ -976,9 +950,6 @@ class Debug_Address {
         return reinterpret_cast<Address>(Debug::debug_break_return_address());
       case Debug::k_debug_break_slot_address:
         return reinterpret_cast<Address>(Debug::debug_break_slot_address());
-      case Debug::k_restarter_frame_function_pointer:
-        return reinterpret_cast<Address>(
-            Debug::restarter_frame_function_pointer_address());
       case Debug::k_register_address:
         return reinterpret_cast<Address>(Debug::register_address(reg_));
       default:

src/ia32/debug-ia32.cc

@@ -265,10 +265,6 @@ void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
 //   -- context
 //   -- frame base
 void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
-  ExternalReference restarter_frame_function_slot =
-      ExternalReference(Debug_Address::RestarterFrameFunctionPointer());
-  __ mov(Operand::StaticVariable(restarter_frame_function_slot), Immediate(0));
-
   // We do not know our frame height, but set esp based on ebp.
   __ lea(esp, Operand(ebp, -4 * kPointerSize));
 
@@ -292,10 +288,8 @@ void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
 #undef __
 
 
-// TODO(LiveEdit): consider making it platform-independent.
-// TODO(LiveEdit): use more named constants instead of numbers.
-Object** Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
-                                       Handle<Code> code) {
+void Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
+                                   Handle<Code> code) {
   ASSERT(bottom_js_frame->is_java_script());
 
   Address fp = bottom_js_frame->fp();
@@ -304,10 +298,7 @@ Object** Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
 
   Memory::Object_at(fp - 3 * kPointerSize) = *code;
   Memory::Object_at(fp - 2 * kPointerSize) = Smi::FromInt(StackFrame::INTERNAL);
-
-  return reinterpret_cast<Object**>(&Memory::Object_at(fp - 4 * kPointerSize));
 }
-
 const int Debug::kFrameDropperFrameSize = 5;
 
 

src/liveedit.cc

@@ -1188,8 +1188,7 @@ static bool FixTryCatchHandler(StackFrame* top_frame,
 static const char* DropFrames(Vector<StackFrame*> frames,
                               int top_frame_index,
                               int bottom_js_frame_index,
-                              Debug::FrameDropMode* mode,
-                              Object*** restarter_frame_function_pointer) {
+                              Debug::FrameDropMode* mode) {
   if (Debug::kFrameDropperFrameSize < 0) {
     return "Stack manipulations are not supported in this architecture.";
   }
@@ -1239,10 +1238,7 @@ static const char* DropFrames(Vector<StackFrame*> frames,
   top_frame->set_pc(code->entry());
   pre_top_frame->SetCallerFp(bottom_js_frame->fp());
 
-  *restarter_frame_function_pointer =
-      Debug::SetUpFrameDropperFrame(bottom_js_frame, code);
-
-  ASSERT((**restarter_frame_function_pointer)->IsJSFunction());
+  Debug::SetUpFrameDropperFrame(bottom_js_frame, code);
 
   for (Address a = unused_stack_top;
       a < unused_stack_bottom;
@@ -1332,10 +1328,8 @@ static const char* DropActivationsInActiveThread(
   }
 
   Debug::FrameDropMode drop_mode = Debug::FRAMES_UNTOUCHED;
-  Object** restarter_frame_function_pointer = NULL;
   const char* error_message = DropFrames(frames, top_frame_index,
-                                         bottom_js_frame_index, &drop_mode,
-                                         &restarter_frame_function_pointer);
+                                         bottom_js_frame_index, &drop_mode);
 
   if (error_message != NULL) {
     return error_message;
@@ -1349,8 +1343,7 @@ static const char* DropActivationsInActiveThread(
       break;
     }
   }
-  Debug::FramesHaveBeenDropped(new_id, drop_mode,
-                               restarter_frame_function_pointer);
+  Debug::FramesHaveBeenDropped(new_id, drop_mode);
 
   // Replace "blocked on active" with "replaced on active" status.
   for (int i = 0; i < array_len; i++) {

src/mips/debug-mips.cc

@@ -117,10 +117,9 @@ void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
 #undef __
 
 
-Object** Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
-                                       Handle<Code> code) {
+void Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
+                                   Handle<Code> code) {
   UNREACHABLE();
-  return NULL;
 }
 const int Debug::kFrameDropperFrameSize = -1;
 

src/serialize.cc

@@ -237,10 +237,6 @@ void ExternalReferenceTable::PopulateTable() {
       DEBUG_ADDRESS,
       Debug::k_debug_break_return_address << kDebugIdShift,
       "Debug::debug_break_return_address()");
-  Add(Debug_Address(Debug::k_restarter_frame_function_pointer).address(),
-      DEBUG_ADDRESS,
-      Debug::k_restarter_frame_function_pointer << kDebugIdShift,
-      "Debug::restarter_frame_function_pointer_address()");
   const char* debug_register_format = "Debug::register_address(%i)";
   int dr_format_length = StrLength(debug_register_format);
   for (int i = 0; i < kNumJSCallerSaved; ++i) {
@@ -482,7 +478,6 @@ ExternalReferenceEncoder::ExternalReferenceEncoder()
 
 uint32_t ExternalReferenceEncoder::Encode(Address key) const {
   int index = IndexOf(key);
-  ASSERT(key == NULL || index >= 0);
   return index >=0 ? ExternalReferenceTable::instance()->code(index) : 0;
 }
 

src/x64/debug-x64.cc

@@ -213,10 +213,9 @@ void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
 #undef __
 
 
-Object** Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
-                                       Handle<Code> code) {
+void Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
+                                   Handle<Code> code) {
   UNREACHABLE();
-  return NULL;
 }
 const int Debug::kFrameDropperFrameSize = -1;