[liveedit] reimplement frame restarting.

src/ia32/macro-assembler-ia32.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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 663 matching lines @@
 }
 
 void MacroAssembler::DebugBreak() {
   Move(eax, Immediate(0));
   mov(ebx, Immediate(ExternalReference(Runtime::kHandleDebuggerStatement,
                                        isolate())));
   CEntryStub ces(isolate(), 1);
   call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT);
 }
 
+void MacroAssembler::MaybeDropFrames() {
+  // Check whether we need to drop frames to restart a function on the stack.
+  ExternalReference restart_fp =
+      ExternalReference::debug_restart_fp_address(isolate());
+  mov(ebx, Operand::StaticVariable(restart_fp));
+  test(ebx, ebx);
+  j(not_zero, isolate()->builtins()->FrameDropperTrampoline(),
+    RelocInfo::CODE_TARGET);
+}
+
 void MacroAssembler::Cvtsi2sd(XMMRegister dst, const Operand& src) {
   xorps(dst, dst);
   cvtsi2sd(dst, src);
 }
 
 
 void MacroAssembler::Cvtui2ss(XMMRegister dst, Register src, Register tmp) {
   Label msb_set_src;
   Label jmp_return;
   test(src, src);
@@ skipping 1215 matching lines @@
       j(equal, &invoke);
       DCHECK(expected.reg().is(ebx));
     } else if (!expected.reg().is(actual.reg())) {
       // Both expected and actual are in (different) registers. This
       // is the case when we invoke functions using call and apply.
       cmp(expected.reg(), actual.reg());
       j(equal, &invoke);
       DCHECK(actual.reg().is(eax));
       DCHECK(expected.reg().is(ebx));
     } else {
+      definitely_matches = true;
       Move(eax, actual.reg());
     }
   }
 
   if (!definitely_matches) {
     Handle<Code> adaptor =
         isolate()->builtins()->ArgumentsAdaptorTrampoline();
     if (flag == CALL_FUNCTION) {
       call_wrapper.BeforeCall(CallSize(adaptor, RelocInfo::CODE_TARGET));
       call(adaptor, RelocInfo::CODE_TARGET);
@@ skipping 1018 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32