[runtime] Unify and simplify how frames are marked

src/x64/deoptimizer-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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/register-configuration.h"
@@ skipping 138 matching lines @@
   // and compute the fp-to-sp delta in register arg5.
   __ movp(arg_reg_4, Operand(rsp, kSavedRegistersAreaSize + 1 * kRegisterSize));
   __ leap(arg5, Operand(rsp, kSavedRegistersAreaSize + 1 * kRegisterSize +
                             kPCOnStackSize));
 
   __ subp(arg5, rbp);
   __ negp(arg5);
 
   // Allocate a new deoptimizer object.
   __ PrepareCallCFunction(6);
+  __ movp(rax, Immediate(0));
+  Label context_check;
+  __ movp(rdi, Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset));
+  __ JumpIfSmi(rdi, &context_check);
   __ movp(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
+  __ bind(&context_check);
   __ movp(arg_reg_1, rax);
   __ Set(arg_reg_2, type());
   // Args 3 and 4 are already in the right registers.
 
   // On windows put the arguments on the stack (PrepareCallCFunction
   // has created space for this). On linux pass the arguments in r8 and r9.
 #ifdef _WIN64
   __ movq(Operand(rsp, 4 * kRegisterSize), arg5);
   __ LoadAddress(arg5, ExternalReference::isolate_address(isolate()));
   __ movq(Operand(rsp, 5 * kRegisterSize), arg5);
@@ skipping 157 matching lines @@
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64