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

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index e26ceab567049f96a95ea6534e1cbc82b058ced1..c916db5f22fd0ef9b2bc1600d32cf076123f2d43 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -1876,15 +1876,18 @@ static void GenerateRecordCallTarget(MacroAssembler* masm, bool is_super) {
 
 
 static void EmitContinueIfStrictOrNative(MacroAssembler* masm, Label* cont) {
+  // ----------- S t a t e -------------
+  // -- rdi : the function to call
+  // -- rdx : the function's shared function info
+  // -----------------------------------
+  // Assume that SharedFunctionInfo is already loaded into rdx.
   // Do not transform the receiver for strict mode functions.
-  __ movp(rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-  __ testb(FieldOperand(rcx, SharedFunctionInfo::kStrictModeByteOffset),
+  __ testb(FieldOperand(rdx, SharedFunctionInfo::kStrictModeByteOffset),
            Immediate(1 << SharedFunctionInfo::kStrictModeBitWithinByte));
   __ j(not_equal, cont);
 
   // Do not transform the receiver for natives.
-  // SharedFunctionInfo is already loaded into rcx.
-  __ testb(FieldOperand(rcx, SharedFunctionInfo::kNativeByteOffset),
+  __ testb(FieldOperand(rdx, SharedFunctionInfo::kNativeByteOffset),
            Immediate(1 << SharedFunctionInfo::kNativeBitWithinByte));
   __ j(not_equal, cont);
 }
@@ -1912,10 +1915,30 @@ static void EmitWrapCase(MacroAssembler* masm,
 }
 
 
+static void EmitClassConstructorCallCheck(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  // -- rdi : the function to call
+  // -- rdx : the function's shared function info
+  // -----------------------------------
+  // ClassConstructor Check: ES6 section 9.2.1 [[Call]]
+  Label non_class_constructor;
+  // Check whether the current function is a classConstructor
+  __ testb(FieldOperand(rdx, SharedFunctionInfo::kFunctionKindByteOffset),
+           Immediate(FunctionKind::kClassConstructor));
+  __ j(zero, &non_class_constructor, Label::kNear);
+  // If we call a classConstructor Function throw a TypeError
+  // indirectly via the CallFunction builtin.
+  __ Jump(masm->isolate()->builtins()->CallFunction(), RelocInfo::CODE_TARGET);
+  __ bind(&non_class_constructor);
+}
+
+
 static void CallFunctionNoFeedback(MacroAssembler* masm,
                                    int argc, bool needs_checks,
                                    bool call_as_method) {
-  // rdi : the function to call
+  // ----------- S t a t e -------------
+  // -- rdi : the function to call
+  // -----------------------------------
 
   // wrap_and_call can only be true if we are compiling a monomorphic method.
   Label slow, wrap, cont;
@@ -1930,6 +1953,9 @@ static void CallFunctionNoFeedback(MacroAssembler* masm,
     __ j(not_equal, &slow);
   }
 
+  __ movp(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  EmitClassConstructorCallCheck(masm);
+
   // Fast-case: Just invoke the function.
   ParameterCount actual(argc);
 
@@ -2047,9 +2073,11 @@ void CallICStub::HandleArrayCase(MacroAssembler* masm, Label* miss) {
 
 
 void CallICStub::Generate(MacroAssembler* masm) {
-  // rdi - function
-  // rdx - slot id
-  // rbx - vector
+  // ----------- S t a t e -------------
+  // -- rdi - function
+  // -- rdx - slot id
+  // -- rbx - vector
+  // -----------------------------------
   Isolate* isolate = masm->isolate();
   const int with_types_offset =
       FixedArray::OffsetOfElementAt(TypeFeedbackVector::kWithTypesIndex);
@@ -2094,6 +2122,10 @@ void CallICStub::Generate(MacroAssembler* masm) {
                     Smi::FromInt(CallICNexus::kCallCountIncrement));
 
   __ bind(&have_js_function);
+
+  __ movp(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  EmitClassConstructorCallCheck(masm);
+
   if (CallAsMethod()) {
     EmitContinueIfStrictOrNative(masm, &cont);