MIPS: CallIC customization stubs must accept that a vector slot is cleared.

src/mips/code-stubs-mips.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_MIPS
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 3076 matching lines @@
   Label miss;
 
   EmitLoadTypeFeedbackVector(masm, a2);
 
   __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, at);
   __ Branch(&miss, ne, a1, Operand(at));
 
   __ li(a0, Operand(arg_count()));
   __ sll(at, a3, kPointerSizeLog2 - kSmiTagSize);
   __ Addu(at, a2, Operand(at));
-  __ lw(a2, FieldMemOperand(at, FixedArray::kHeaderSize));
-  // Verify that a2 contains an AllocationSite
-  __ AssertUndefinedOrAllocationSite(a2, at);
+  __ lw(t0, FieldMemOperand(at, FixedArray::kHeaderSize));
+
+  // Verify that t0 contains an AllocationSite
+  __ lw(t1, FieldMemOperand(t0, HeapObject::kMapOffset));
+  __ LoadRoot(at, Heap::kAllocationSiteMapRootIndex);
+  __ Branch(&miss, ne, t1, Operand(at));
+
+  __ mov(a2, t0);
   ArrayConstructorStub stub(masm->isolate(), arg_count());
   __ TailCallStub(&stub);
 
   __ bind(&miss);
   GenerateMiss(masm, IC::kCallIC_Customization_Miss);
 
   // The slow case, we need this no matter what to complete a call after a miss.
   CallFunctionNoFeedback(masm,
                          arg_count(),
                          true,
@@ skipping 46 matching lines @@
 
   __ bind(&extra_checks_or_miss);
   Label miss;
 
   __ LoadRoot(at, Heap::kMegamorphicSymbolRootIndex);
   __ Branch(&slow_start, eq, t0, Operand(at));
   __ LoadRoot(at, Heap::kUninitializedSymbolRootIndex);
   __ Branch(&miss, eq, t0, Operand(at));
 
   if (!FLAG_trace_ic) {
-    // We are going megamorphic, and we don't want to visit the runtime.
+    // We are going megamorphic. If the feedback is a JSFunction, it is fine
+    // to handle it here. More complex cases are dealt with in the runtime.
+    __ AssertNotSmi(t0);
+    __ GetObjectType(t0, t1, t1);
+    __ Branch(&miss, ne, t1, Operand(JS_FUNCTION_TYPE));
     __ sll(t0, a3, kPointerSizeLog2 - kSmiTagSize);
     __ Addu(t0, a2, Operand(t0));
     __ LoadRoot(at, Heap::kMegamorphicSymbolRootIndex);
     __ sw(at, FieldMemOperand(t0, FixedArray::kHeaderSize));
     __ Branch(&slow_start);
   }
 
   // We are here because tracing is on or we are going monomorphic.
   __ bind(&miss);
   GenerateMiss(masm, IC::kCallIC_Miss);
@@ skipping 2084 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS