Revert of [runtime] Fix ES6 9.2.1 [[Call]] when encountering a classConstructor.

src/mips64/builtins-mips64.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.
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1542 matching lines @@
 
 // static
 void Builtins::Generate_CallFunction(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- a0 : the number of arguments (not including the receiver)
   //  -- a1 : the function to call (checked to be a JSFunction)
   // -----------------------------------
 
   Label convert, convert_global_proxy, convert_to_object, done_convert;
   __ AssertFunction(a1);
-  __ ld(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
-
-  {
-    Label non_class_constructor;
-    // Check whether the current function is a classConstructor
-    __ lbu(a3,
-           FieldMemOperand(a2, SharedFunctionInfo::kFunctionKindByteOffset));
-    __ And(at, a3,
-           Operand(SharedFunctionInfo::kClassConstructorBitsWithinByte));
-    __ Branch(&non_class_constructor, eq, at, Operand(zero_reg));
-    // Step: 2, If we call a classConstructor Function throw a TypeError.
-    {
-      FrameScope frame(masm, StackFrame::INTERNAL);
-      __ CallRuntime(Runtime::kThrowConstructorNonCallableError, 0);
-    }
-    __ bind(&non_class_constructor);
-  }
-
+  // TODO(bmeurer): Throw a TypeError if function's [[FunctionKind]] internal
+  // slot is "classConstructor".
   // Enter the context of the function; ToObject has to run in the function
   // context, and we also need to take the global proxy from the function
   // context in case of conversion.
   // See ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
   STATIC_ASSERT(SharedFunctionInfo::kNativeByteOffset ==
                 SharedFunctionInfo::kStrictModeByteOffset);
   __ ld(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+  __ ld(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
   // We need to convert the receiver for non-native sloppy mode functions.
   __ lbu(a3, FieldMemOperand(a2, SharedFunctionInfo::kNativeByteOffset));
   __ And(at, a3, Operand((1 << SharedFunctionInfo::kNativeBitWithinByte) |
                          (1 << SharedFunctionInfo::kStrictModeBitWithinByte)));
   __ Branch(&done_convert, ne, at, Operand(zero_reg));
   {
     __ dsll(at, a0, kPointerSizeLog2);
     __ daddu(at, sp, at);
     __ ld(a3, MemOperand(at));
 
@@ skipping 339 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64