| Index: src/arguments.h | 
| diff --git a/src/arguments.h b/src/arguments.h | 
| index 63a3706fd8731264c2e779a768dc5fc9645a3ee3..d11a8cd61ee0b18659e2e66164f3c5de20675411 100644 | 
| --- a/src/arguments.h | 
| +++ b/src/arguments.h | 
| @@ -29,10 +29,13 @@ namespace internal { | 
| class Arguments BASE_EMBEDDED { | 
| public: | 
| Arguments(int length, Object** arguments) | 
| -      : length_(length), arguments_(arguments) { } | 
| +      : length_(length), arguments_(arguments) { | 
| +    DCHECK_GE(length_, 0); | 
| +  } | 
|  | 
| Object*& operator[] (int index) { | 
| -    DCHECK(0 <= index && index < length_); | 
| +    DCHECK_GE(index, 0); | 
| +    DCHECK_LT(static_cast<uint32_t>(index), static_cast<uint32_t>(length_)); | 
| return *(reinterpret_cast<Object**>(reinterpret_cast<intptr_t>(arguments_) - | 
| index * kPointerSize)); | 
| } | 
|  |