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

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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1545 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);
-  // TODO(bmeurer): Throw a TypeError if function's [[FunctionKind]] internal
-  // slot is "classConstructor".
+  __ lw(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+
+  {
+    Label non_class_constructor;
+    // Check whether the current function is a classConstructor This only works
+    // since kClassConstructor is more than 1 bit away from the byte boundary in
+    // CompilerHints (note that compiler_hints is stored as smi on 32bit
+    // architectures)
+    STATIC_ASSERT((FunctionKind::kClassConstructor << kSmiTagSize) <
+                  (1 << kBitsPerByte));
+    __ lbu(a3,
+           FieldMemOperand(a2, SharedFunctionInfo::kFunctionKindByteOffset));
+    // Left-shift to account for smi storage in 32bits.
+    __ And(at, a3, Operand(FunctionKind::kClassConstructor << kSmiTagSize));
+    __ 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);
+  }
+
   // 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);
   __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
-  __ lw(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));
   {
     __ sll(at, a0, kPointerSizeLog2);
     __ addu(at, sp, at);
     __ lw(a3, MemOperand(at));
 
@@ skipping 341 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS