new classes: implement new.target passing to superclass constructor.

src/x64/code-stubs-x64.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_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 521 matching lines @@
 
   NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, r8,
                                                           r9, &miss);
   __ bind(&miss);
   PropertyAccessCompiler::TailCallBuiltin(
       masm, PropertyAccessCompiler::MissBuiltin(Code::LOAD_IC));
 }
 
 
 void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
+  CHECK(!has_new_target());
   // The key is in rdx and the parameter count is in rax.
   DCHECK(rdx.is(ArgumentsAccessReadDescriptor::index()));
   DCHECK(rax.is(ArgumentsAccessReadDescriptor::parameter_count()));
 
   // Check that the key is a smi.
   Label slow;
   __ JumpIfNotSmi(rdx, &slow);
 
   // Check if the calling frame is an arguments adaptor frame.  We look at the
   // context offset, and if the frame is not a regular one, then we find a
@@ skipping 47 matching lines @@
 void ArgumentsAccessStub::GenerateNewSloppyFast(MacroAssembler* masm) {
   // Stack layout:
   //  rsp[0]  : return address
   //  rsp[8]  : number of parameters (tagged)
   //  rsp[16] : receiver displacement
   //  rsp[24] : function
   // Registers used over the whole function:
   //  rbx: the mapped parameter count (untagged)
   //  rax: the allocated object (tagged).
 
+  CHECK(!has_new_target());
+
   Factory* factory = isolate()->factory();
 
   StackArgumentsAccessor args(rsp, 3, ARGUMENTS_DONT_CONTAIN_RECEIVER);
   __ SmiToInteger64(rbx, args.GetArgumentOperand(2));
   // rbx = parameter count (untagged)
 
   // Check if the calling frame is an arguments adaptor frame.
   Label runtime;
   Label adaptor_frame, try_allocate;
   __ movp(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
@@ skipping 193 matching lines @@
   __ movp(args.GetArgumentOperand(2), rcx);  // Patch argument count.
   __ TailCallRuntime(Runtime::kNewSloppyArguments, 3, 1);
 }
 
 
 void ArgumentsAccessStub::GenerateNewSloppySlow(MacroAssembler* masm) {
   // rsp[0]  : return address
   // rsp[8]  : number of parameters
   // rsp[16] : receiver displacement
   // rsp[24] : function
+  CHECK(!has_new_target());
 
   // Check if the calling frame is an arguments adaptor frame.
   Label runtime;
   __ movp(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
   __ movp(rcx, Operand(rdx, StandardFrameConstants::kContextOffset));
   __ Cmp(rcx, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
   __ j(not_equal, &runtime);
 
   // Patch the arguments.length and the parameters pointer.
   StackArgumentsAccessor args(rsp, 3, ARGUMENTS_DONT_CONTAIN_RECEIVER);
@@ skipping 89 matching lines @@
 
   // Get the length from the frame.
   StackArgumentsAccessor args(rsp, 3, ARGUMENTS_DONT_CONTAIN_RECEIVER);
   __ movp(rcx, args.GetArgumentOperand(2));
   __ SmiToInteger64(rcx, rcx);
   __ jmp(&try_allocate);
 
   // Patch the arguments.length and the parameters pointer.
   __ bind(&adaptor_frame);
   __ movp(rcx, Operand(rdx, ArgumentsAdaptorFrameConstants::kLengthOffset));
+
+  if (has_new_target()) {
+    // Subtract 1 from smi-tagged arguments count.
+    __ SmiToInteger32(rcx, rcx);
+    __ decp(rcx);
+    __ Integer32ToSmi(rcx, rcx);
+  }
   __ movp(args.GetArgumentOperand(2), rcx);
   __ SmiToInteger64(rcx, rcx);
   __ leap(rdx, Operand(rdx, rcx, times_pointer_size,
                       StandardFrameConstants::kCallerSPOffset));
   __ movp(args.GetArgumentOperand(1), rdx);
 
   // Try the new space allocation. Start out with computing the size of
   // the arguments object and the elements array.
   Label add_arguments_object;
   __ bind(&try_allocate);
@@ skipping 1070 matching lines @@
       __ CompareRoot(FieldOperand(rbx, 0), Heap::kAllocationSiteMapRootIndex);
       __ j(equal, &feedback_register_initialized);
       __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
       __ bind(&feedback_register_initialized);
     }
 
     __ AssertUndefinedOrAllocationSite(rbx);
   }
 
   // Pass original constructor to construct stub.
-  __ movp(rdx, rdi);
+  if (IsSuperConstructorCall()) {
+    __ movp(rdx, Operand(rsp, rax, times_pointer_size, 2 * kPointerSize));
+  } else {
+    __ movp(rdx, rdi);
+  }
 
   // Jump to the function-specific construct stub.
   Register jmp_reg = rcx;
   __ movp(jmp_reg, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
   __ movp(jmp_reg, FieldOperand(jmp_reg,
                                 SharedFunctionInfo::kConstructStubOffset));
   __ leap(jmp_reg, FieldOperand(jmp_reg, Code::kHeaderSize));
   __ jmp(jmp_reg);
 
   // rdi: called object
@@ skipping 3022 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, getter_arg,
                            kStackSpace, nullptr, return_value_operand, NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64