Debugger: use debug break slot to break on call.

src/x64/debug-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 51 matching lines @@
   PatchCodeWithCall(
       pc(), debug_info_->GetIsolate()->builtins()->Slot_DebugBreak()->entry(),
       Assembler::kDebugBreakSlotLength - Assembler::kCallSequenceLength);
 }
 
 
 #define __ ACCESS_MASM(masm)
 
 
 static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
-                                          RegList object_regs,
-                                          RegList non_object_regs,
-                                          bool convert_call_to_jmp) {
+                                          RegList object_regs) {
   // Enter an internal frame.
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
 
     // Load padding words on stack.
     for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) {
       __ Push(Smi::FromInt(LiveEdit::kFramePaddingValue));
     }
     __ Push(Smi::FromInt(LiveEdit::kFramePaddingInitialSize));
 
     // Store the registers containing live values on the expression stack to
     // make sure that these are correctly updated during GC. Non object values
     // are stored as as two smis causing it to be untouched by GC.
     DCHECK((object_regs & ~kJSCallerSaved) == 0);
-    DCHECK((non_object_regs & ~kJSCallerSaved) == 0);
-    DCHECK((object_regs & non_object_regs) == 0);
     for (int i = 0; i < kNumJSCallerSaved; i++) {
       int r = JSCallerSavedCode(i);
       Register reg = { r };
       DCHECK(!reg.is(kScratchRegister));
       if ((object_regs & (1 << r)) != 0) {
         __ Push(reg);
       }
-      if ((non_object_regs & (1 << r)) != 0) {
-        __ PushRegisterAsTwoSmis(reg);
-      }
     }
 
 #ifdef DEBUG
     __ RecordComment("// Calling from debug break to runtime - come in - over");
 #endif
     __ Set(rax, 0);  // No arguments (argc == 0).
     __ Move(rbx, ExternalReference::debug_break(masm->isolate()));
 
     CEntryStub ceb(masm->isolate(), 1);
     __ CallStub(&ceb);
 
     // Restore the register values from the expression stack.
     for (int i = kNumJSCallerSaved - 1; i >= 0; i--) {
       int r = JSCallerSavedCode(i);
       Register reg = { r };
       if (FLAG_debug_code) {
         __ Set(reg, kDebugZapValue);
       }
       if ((object_regs & (1 << r)) != 0) {
         __ Pop(reg);
       }
-      // Reconstruct the 64-bit value from two smis.
-      if ((non_object_regs & (1 << r)) != 0) {
-        __ PopRegisterAsTwoSmis(reg);
-      }
     }
 
     // Read current padding counter and skip corresponding number of words.
     __ Pop(kScratchRegister);
     __ SmiToInteger32(kScratchRegister, kScratchRegister);
     __ leap(rsp, Operand(rsp, kScratchRegister, times_pointer_size, 0));
 
     // Get rid of the internal frame.
   }
 
-  // If this call did not replace a call but patched other code then there will
-  // be an unwanted return address left on the stack. Here we get rid of that.
-  if (convert_call_to_jmp) {
-    __ addp(rsp, Immediate(kPCOnStackSize));
-  }
+  // This call did not replace a call , so there will be an unwanted
+  // return address left on the stack. Here we get rid of that.
+  __ addp(rsp, Immediate(kPCOnStackSize));
 
   // Now that the break point has been handled, resume normal execution by
   // jumping to the target address intended by the caller and that was
   // overwritten by the address of DebugBreakXXX.
   ExternalReference after_break_target =
       ExternalReference::debug_after_break_target_address(masm->isolate());
   __ Move(kScratchRegister, after_break_target);
   __ Jump(Operand(kScratchRegister, 0));
 }
 
 
-void DebugCodegen::GenerateCallICStubDebugBreak(MacroAssembler* masm) {
-  // Register state for CallICStub
-  // ----------- S t a t e -------------
-  //  -- rdx    : type feedback slot (smi)
-  //  -- rdi    : function
-  // -----------------------------------
-  Generate_DebugBreakCallHelper(masm, rdx.bit() | rdi.bit(), 0, false);
-}
-
-
 void DebugCodegen::GenerateReturnDebugBreak(MacroAssembler* masm) {
   // Register state just before return from JS function (from codegen-x64.cc).
   // ----------- S t a t e -------------
   //  -- rax: return value
   // -----------------------------------
-  Generate_DebugBreakCallHelper(masm, rax.bit(), 0, true);
+  Generate_DebugBreakCallHelper(masm, rax.bit());
 }
 
 
-void DebugCodegen::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) {
-  // Register state for CallFunctionStub (from code-stubs-x64.cc).
-  // ----------- S t a t e -------------
-  //  -- rdi : function
-  // -----------------------------------
-  Generate_DebugBreakCallHelper(masm, rdi.bit(), 0, false);
-}
-
-
-void DebugCodegen::GenerateCallConstructStubDebugBreak(MacroAssembler* masm) {
-  // Register state for CallConstructStub (from code-stubs-x64.cc).
-  // rax is the actual number of arguments not encoded as a smi, see comment
-  // above IC call.
-  // ----------- S t a t e -------------
-  //  -- rax: number of arguments
-  // -----------------------------------
-  // The number of arguments in rax is not smi encoded.
-  Generate_DebugBreakCallHelper(masm, rdi.bit(), rax.bit(), false);
-}
-
-
-void DebugCodegen::GenerateCallConstructStubRecordDebugBreak(
-    MacroAssembler* masm) {
-  // Register state for CallConstructStub (from code-stubs-x64.cc).
-  // rax is the actual number of arguments not encoded as a smi, see comment
-  // above IC call.
-  // ----------- S t a t e -------------
-  //  -- rax: number of arguments
-  //  -- rbx: feedback array
-  //  -- rdx: feedback slot (smi)
-  // -----------------------------------
-  // The number of arguments in rax is not smi encoded.
-  Generate_DebugBreakCallHelper(masm, rbx.bit() | rdx.bit() | rdi.bit(),
-                                rax.bit(), false);
-}
-
-
 void DebugCodegen::GenerateSlot(MacroAssembler* masm) {
   // Generate enough nop's to make space for a call instruction.
   Label check_codesize;
   __ bind(&check_codesize);
-  __ RecordDebugBreakSlot();
   __ Nop(Assembler::kDebugBreakSlotLength);
   DCHECK_EQ(Assembler::kDebugBreakSlotLength,
             masm->SizeOfCodeGeneratedSince(&check_codesize));
 }
 
 
 void DebugCodegen::GenerateSlotDebugBreak(MacroAssembler* masm) {
   // In the places where a debug break slot is inserted no registers can contain
   // object pointers.
-  Generate_DebugBreakCallHelper(masm, 0, 0, true);
+  Generate_DebugBreakCallHelper(masm, 0);
 }
 
 
 void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
   masm->ret(0);
 }
 
 
 void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
   ExternalReference restarter_frame_function_slot =
@@ skipping 21 matching lines @@
 }
 
 const bool LiveEdit::kFrameDropperSupported = true;
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64