new classes: change semantics of super(...) call and add new.target to construct stub.

src/arm64/builtins-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/codegen.h"
 #include "src/debug.h"
@@ skipping 290 matching lines @@
 }
 
 
 static void Generate_JSConstructStubHelper(MacroAssembler* masm,
                                            bool is_api_function,
                                            bool create_memento) {
   // ----------- S t a t e -------------
   //  -- x0     : number of arguments
   //  -- x1     : constructor function
   //  -- x2     : allocation site or undefined
+  //  -- x3    : original constructor
   //  -- lr     : return address
   //  -- sp[...]: constructor arguments
   // -----------------------------------
 
   ASM_LOCATION("Builtins::Generate_JSConstructStubHelper");
   // Should never create mementos for api functions.
   DCHECK(!is_api_function || !create_memento);
 
   Isolate* isolate = masm->isolate();
 
   // Enter a construct frame.
   {
     FrameScope scope(masm, StackFrame::CONSTRUCT);
 
     // Preserve the three incoming parameters on the stack.
     if (create_memento) {
       __ AssertUndefinedOrAllocationSite(x2, x10);
       __ Push(x2);
     }
 
     Register argc = x0;
     Register constructor = x1;
+    Register original_constructor = x3;
     // x1: constructor function
     __ SmiTag(argc);
     __ Push(argc, constructor);
     // sp[0] : Constructor function.
     // sp[1]: number of arguments (smi-tagged)
 
+    Label rt_call, count_incremented, allocated, normal_new;
+    __ Cmp(constructor, original_constructor);
+    __ B(eq, &normal_new);
+    {
+      if (create_memento) {
+        // Get the cell or allocation site.
+        __ Peek(x4, 2 * kXRegSize);
+        __ Push(x4);
+        __ Push(constructor);  // Argument for Runtime_NewObject.
+        __ Push(original_constructor);
+        __ CallRuntime(Runtime::kNewObjectWithAllocationSite, 3);
+        __ Mov(x4, x0);
+        // If we ended up using the runtime, and we want a memento, then the
+        // runtime call made it for us, and we shouldn't do create count
+        // increment.
+        __ jmp(&count_incremented);
+      } else {
+        __ Push(constructor);  // Argument for Runtime_NewObject.
+        __ Push(original_constructor);
+        __ CallRuntime(Runtime::kNewObject, 2);
+        __ Mov(x4, x0);
+        __ jmp(&allocated);
+      }
+    }
+
+    __ Bind(&normal_new);
+
     // Try to allocate the object without transitioning into C code. If any of
     // the preconditions is not met, the code bails out to the runtime call.
-    Label rt_call, allocated;
     if (FLAG_inline_new) {
       Label undo_allocation;
       ExternalReference debug_step_in_fp =
           ExternalReference::debug_step_in_fp_address(isolate);
       __ Mov(x2, Operand(debug_step_in_fp));
       __ Ldr(x2, MemOperand(x2));
       __ Cbnz(x2, &rt_call);
       // Load the initial map and verify that it is in fact a map.
       Register init_map = x2;
       __ Ldr(init_map,
@@ skipping 176 matching lines @@
 
       // Undo the setting of the new top so that the heap is verifiable. For
       // example, the map's unused properties potentially do not match the
       // allocated objects unused properties.
       __ Bind(&undo_allocation);
       __ UndoAllocationInNewSpace(new_obj, x14);
     }
 
     // Allocate the new receiver object using the runtime call.
     __ Bind(&rt_call);
-    Label count_incremented;
     if (create_memento) {
       // Get the cell or allocation site.
       __ Peek(x4, 2 * kXRegSize);
       __ Push(x4);
       __ Push(constructor);  // Argument for Runtime_NewObject.
-      __ CallRuntime(Runtime::kNewObjectWithAllocationSite, 2);
+      __ Push(constructor);
+      __ CallRuntime(Runtime::kNewObjectWithAllocationSite, 3);
       __ Mov(x4, x0);
       // If we ended up using the runtime, and we want a memento, then the
       // runtime call made it for us, and we shouldn't do create count
       // increment.
       __ jmp(&count_incremented);
     } else {
       __ Push(constructor);  // Argument for Runtime_NewObject.
-      __ CallRuntime(Runtime::kNewObject, 1);
+      __ Push(constructor);
+      __ CallRuntime(Runtime::kNewObject, 2);
       __ Mov(x4, x0);
     }
 
     // Receiver for constructor call allocated.
     // x4: JSObject
     __ Bind(&allocated);
 
     if (create_memento) {
       __ Peek(x10, 2 * kXRegSize);
       __ JumpIfRoot(x10, Heap::kUndefinedValueRootIndex, &count_incremented);
@@ skipping 992 matching lines @@
     __ Unreachable();
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM