Check that index and length are Smi in bounds check.

src/arm/lithium-codegen-arm.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 3874 matching lines @@
 
   // Name is always in r2.
   __ mov(r2, Operand(instr->name()));
   Handle<Code> ic = (instr->strict_mode_flag() == kStrictMode)
       ? isolate()->builtins()->StoreIC_Initialize_Strict()
       : isolate()->builtins()->StoreIC_Initialize();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
 
+void LCodeGen::DeoptIfTaggedButNotSmi(LEnvironment* environment,
+                                      HValue* value,
+                                      LOperand* operand) {
+  if (value->representation().IsTagged() && !value->type().IsSmi()) {
+    if (operand->IsRegister()) {
+      __ tst(ToRegister(operand), Operand(kSmiTagMask));
+    } else {
+      __ mov(ip, ToOperand(operand));
+      __ tst(ip, Operand(kSmiTagMask));
+    }
+    DeoptimizeIf(ne, environment);
+  }
+}
+
+
 void LCodeGen::DoBoundsCheck(LBoundsCheck* instr) {
+  DeoptIfTaggedButNotSmi(instr->environment(),
+                         instr->hydrogen()->length(),
+                         instr->length());
+  DeoptIfTaggedButNotSmi(instr->environment(),
+                         instr->hydrogen()->index(),
+                         instr->index());
   if (instr->index()->IsConstantOperand()) {
     int constant_index =
         ToInteger32(LConstantOperand::cast(instr->index()));
     if (instr->hydrogen()->length()->representation().IsTagged()) {
       __ mov(ip, Operand(Smi::FromInt(constant_index)));
     } else {
       __ mov(ip, Operand(constant_index));
     }
     __ cmp(ip, ToRegister(instr->length()));
   } else {
@@ skipping 1623 matching lines @@
   __ sub(scratch, result, Operand(index, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal