Remove new.target value from construct stub frames.

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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 483 matching lines @@
       __ Bind(&allocated);
 
       // Reload the number of arguments from the stack.
       // Set it up in x0 for the function call below.
       // jssp[0]: number of arguments (smi-tagged)
       __ Peek(argc, 0);  // Load number of arguments.
     }
 
     __ SmiUntag(argc);
 
-    // Push new.target onto the construct frame. This is stored just below the
-    // receiver on the stack.
     if (create_implicit_receiver) {
       // Push the allocated receiver to the stack. We need two copies
       // because we may have to return the original one and the calling
       // conventions dictate that the called function pops the receiver.
-      __ Push(new_target, x4, x4);
+      __ Push(x4, x4);
     } else {
-      __ push(new_target);
       __ PushRoot(Heap::kTheHoleValueRootIndex);
     }
 
     // Set up pointer to last argument.
     __ Add(x2, fp, StandardFrameConstants::kCallerSPOffset);
 
     // Copy arguments and receiver to the expression stack.
     // Copy 2 values every loop to use ldp/stp.
     // x0: number of arguments
     // x1: constructor function
     // x2: address of last argument (caller sp)
     // x3: new target
     // jssp[0]: receiver
     // jssp[1]: receiver
-    // jssp[2]: new.target
-    // jssp[3]: number of arguments (smi-tagged)
+    // jssp[2]: number of arguments (smi-tagged)
     // Compute the start address of the copy in x3.
     __ Add(x4, x2, Operand(argc, LSL, kPointerSizeLog2));
     Label loop, entry, done_copying_arguments;
     __ B(&entry);
     __ Bind(&loop);
     __ Ldp(x10, x11, MemOperand(x4, -2 * kPointerSize, PreIndex));
     __ Push(x11, x10);
     __ Bind(&entry);
     __ Cmp(x4, x2);
     __ B(gt, &loop);
@@ skipping 19 matching lines @@
     }
 
     // Store offset of return address for deoptimizer.
     if (create_implicit_receiver && !is_api_function) {
       masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
     }
 
     // Restore the context from the frame.
     // x0: result
     // jssp[0]: receiver
-    // jssp[1]: new.target
-    // jssp[2]: number of arguments (smi-tagged)
+    // jssp[1]: number of arguments (smi-tagged)
     __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
 
     if (create_implicit_receiver) {
       // If the result is an object (in the ECMA sense), we should get rid
       // of the receiver and use the result; see ECMA-262 section 13.2.2-7
       // on page 74.
       Label use_receiver, exit;
 
       // If the result is a smi, it is *not* an object in the ECMA sense.
       // x0: result
       // jssp[0]: receiver (newly allocated object)
       // jssp[1]: number of arguments (smi-tagged)
       __ JumpIfSmi(x0, &use_receiver);
 
       // If the type of the result (stored in its map) is less than
       // FIRST_JS_RECEIVER_TYPE, it is not an object in the ECMA sense.
       __ JumpIfObjectType(x0, x1, x3, FIRST_JS_RECEIVER_TYPE, &exit, ge);
 
       // Throw away the result of the constructor invocation and use the
       // on-stack receiver as the result.
       __ Bind(&use_receiver);
       __ Peek(x0, 0);
 
       // Remove the receiver from the stack, remove caller arguments, and
       // return.
       __ Bind(&exit);
       // x0: result
       // jssp[0]: receiver (newly allocated object)
-      // jssp[1]: new target
-      // jssp[2]: number of arguments (smi-tagged)
-      __ Peek(x1, 2 * kXRegSize);
+      // jssp[1]: number of arguments (smi-tagged)
+      __ Peek(x1, 1 * kXRegSize);
     } else {
-      __ Peek(x1, kXRegSize);
+      __ Peek(x1, 0);
     }
 
     // Leave construct frame.
   }
 
   __ DropBySMI(x1);
   __ Drop(1);
   if (create_implicit_receiver) {
     __ IncrementCounter(isolate->counters()->constructed_objects(), 1, x1, x2);
   }
@@ skipping 1414 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM