Continued fix for 351257. Reusing the feedback vector is too complex.

src/mips/full-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 121 matching lines @@
 //   o sp: stack pointer
 //   o ra: return address
 //
 // The function builds a JS frame.  Please see JavaScriptFrameConstants in
 // frames-mips.h for its layout.
 void FullCodeGenerator::Generate() {
   CompilationInfo* info = info_;
   handler_table_ =
       isolate()->factory()->NewFixedArray(function()->handler_count(), TENURED);
 
-  InitializeFeedbackVector();
-
   profiling_counter_ = isolate()->factory()->NewCell(
       Handle<Smi>(Smi::FromInt(FLAG_interrupt_budget), isolate()));
   SetFunctionPosition(function());
   Comment cmnt(masm_, "[ function compiled by full code generator");
 
   ProfileEntryHookStub::MaybeCallEntryHook(masm_);
 
 #ifdef DEBUG
   if (strlen(FLAG_stop_at) > 0 &&
       info->function()->name()->IsUtf8EqualTo(CStrVector(FLAG_stop_at))) {
@@ skipping 1015 matching lines @@
   __ jmp(&loop);
 
   __ bind(&no_descriptors);
   __ Drop(1);
   __ jmp(&exit);
 
   // We got a fixed array in register v0. Iterate through that.
   Label non_proxy;
   __ bind(&fixed_array);
 
-  Handle<Object> feedback = Handle<Object>(
-      Smi::FromInt(TypeFeedbackInfo::kForInFastCaseMarker),
-      isolate());
-  StoreFeedbackVectorSlot(slot, feedback);
   __ li(a1, FeedbackVector());
-  __ li(a2, Operand(Smi::FromInt(TypeFeedbackInfo::kForInSlowCaseMarker)));
+  __ li(a2, Operand(TypeFeedbackInfo::MegamorphicSentinel(isolate())));
   __ sw(a2, FieldMemOperand(a1, FixedArray::OffsetOfElementAt(slot)));
 
   __ li(a1, Operand(Smi::FromInt(1)));  // Smi indicates slow check
   __ lw(a2, MemOperand(sp, 0 * kPointerSize));  // Get enumerated object
   STATIC_ASSERT(FIRST_JS_PROXY_TYPE == FIRST_SPEC_OBJECT_TYPE);
   __ GetObjectType(a2, a3, a3);
   __ Branch(&non_proxy, gt, a3, Operand(LAST_JS_PROXY_TYPE));
   __ li(a1, Operand(Smi::FromInt(0)));  // Zero indicates proxy
   __ bind(&non_proxy);
   __ Push(a1, v0);  // Smi and array
@@ skipping 1533 matching lines @@
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
   { PreservePositionScope scope(masm()->positions_recorder());
     for (int i = 0; i < arg_count; i++) {
       VisitForStackValue(args->at(i));
     }
   }
   // Record source position for debugger.
   SetSourcePosition(expr->position());
 
-  Handle<Object> uninitialized =
-      TypeFeedbackInfo::UninitializedSentinel(isolate());
-  StoreFeedbackVectorSlot(expr->CallFeedbackSlot(), uninitialized);
   __ li(a2, FeedbackVector());
   __ li(a3, Operand(Smi::FromInt(expr->CallFeedbackSlot())));
 
   // Record call targets in unoptimized code.
   CallFunctionStub stub(arg_count, RECORD_CALL_TARGET);
   __ lw(a1, MemOperand(sp, (arg_count + 1) * kPointerSize));
   __ CallStub(&stub);
   RecordJSReturnSite(expr);
   // Restore context register.
   __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
@@ skipping 164 matching lines @@
 
   // Call the construct call builtin that handles allocation and
   // constructor invocation.
   SetSourcePosition(expr->position());
 
   // Load function and argument count into a1 and a0.
   __ li(a0, Operand(arg_count));
   __ lw(a1, MemOperand(sp, arg_count * kPointerSize));
 
   // Record call targets in unoptimized code.
-  Handle<Object> uninitialized =
-      TypeFeedbackInfo::UninitializedSentinel(isolate());
-  StoreFeedbackVectorSlot(expr->CallNewFeedbackSlot(), uninitialized);
   __ li(a2, FeedbackVector());
   __ li(a3, Operand(Smi::FromInt(expr->CallNewFeedbackSlot())));
 
   CallConstructStub stub(RECORD_CALL_TARGET);
   __ Call(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL);
   PrepareForBailoutForId(expr->ReturnId(), TOS_REG);
   context()->Plug(v0);
 }
 
 
@@ skipping 2024 matching lines @@
       Assembler::target_address_at(pc_immediate_load_address)) ==
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS