[strong] Function arity check should be based on required parameters

src/mips/builtins-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
 
@@ skipping 1726 matching lines @@
     __ Branch(USE_DELAY_SLOT, &copy, ne, a0, Operand(a2));
     __ addiu(a0, a0, -kPointerSize);  // In delay slot.
 
     __ jmp(&invoke);
   }
 
   {  // Too few parameters: Actual < expected.
     __ bind(&too_few);
 
     // If the function is strong we need to throw an error.
-    Label weak_function;
+    Label no_strong_error;
     __ lw(t1, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
-    __ lw(t1, FieldMemOperand(t1, SharedFunctionInfo::kCompilerHintsOffset));
-    __ And(t2, t1, Operand(1 << (SharedFunctionInfo::kStrongModeFunction +
+    __ lw(t2, FieldMemOperand(t1, SharedFunctionInfo::kCompilerHintsOffset));
+    __ And(t3, t2, Operand(1 << (SharedFunctionInfo::kStrongModeFunction +
                                  kSmiTagSize)));
-    __ Branch(&weak_function, eq, t2, Operand(zero_reg));
+    __ Branch(&no_strong_error, eq, t3, Operand(zero_reg));
+
+    // What we really care about is the required number of arguments.
+    __ lw(t2, FieldMemOperand(t1, SharedFunctionInfo::kLengthOffset));
+    __ SmiUntag(t2);
+    __ Branch(&no_strong_error, ge, a0, Operand(t2));
 
     {
       FrameScope frame(masm, StackFrame::MANUAL);
       EnterArgumentsAdaptorFrame(masm);
       __ CallRuntime(Runtime::kThrowStrongModeTooFewArguments, 0);
     }
 
-    __ bind(&weak_function);
+    __ bind(&no_strong_error);
     EnterArgumentsAdaptorFrame(masm);
 
     // Calculate copy start address into a0 and copy end address is fp.
     // a0: actual number of arguments as a smi
     // a1: function
     // a2: expected number of arguments
     // a3: code entry to call
     __ sll(a0, a0, kPointerSizeLog2 - kSmiTagSize);
     __ Addu(a0, fp, a0);
     // Adjust for return address and receiver.
@@ skipping 60 matching lines @@
     __ break_(0xCC);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS