MIPS: [runtime] Unify and simplify how frames are marked.

src/mips64/deoptimizer-mips64.cc

 // Copyright 2011 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/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/register-configuration.h"
 #include "src/safepoint-table.h"
 
@@ skipping 143 matching lines @@
   // address for lazy deoptimization) and compute the fp-to-sp delta in
   // register a4.
   __ mov(a3, ra);
   // Correct one word for bailout id.
   __ Daddu(a4, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize)));
 
   __ Dsubu(a4, fp, a4);
 
   // Allocate a new deoptimizer object.
   __ PrepareCallCFunction(6, a5);
-  // Pass six arguments, according to O32 or n64 ABI. a0..a3 are same for both.
-  __ li(a1, Operand(type()));  // bailout type,
+  // Pass six arguments, according to n64 ABI.
+  __ mov(a0, zero_reg);
+  Label context_check;
+  __ ld(a1, MemOperand(fp, CommonFrameConstants::kContextOrFrameTypeOffset));
+  __ JumpIfSmi(a1, &context_check);
   __ ld(a0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ bind(&context_check);
+  __ li(a1, Operand(type()));  // Bailout type.
   // a2: bailout id already loaded.
   // a3: code address or 0 already loaded.
   // a4: already has fp-to-sp delta.
   __ li(a5, Operand(ExternalReference::isolate_address(isolate())));
 
   // Call Deoptimizer::New().
   {
     AllowExternalCallThatCantCauseGC scope(masm());
     __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6);
   }
@@ skipping 204 matching lines @@
   // No embedded constant pool support.
   UNREACHABLE();
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8