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

src/arm/code-stubs-arm.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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1470 matching lines @@
   StubRuntimeCallHelper call_helper;
   char_at_generator.GenerateSlow(masm, call_helper);
 
   __ bind(&miss);
   PropertyAccessCompiler::TailCallBuiltin(
       masm, PropertyAccessCompiler::MissBuiltin(Code::KEYED_LOAD_IC));
 }
 
 
 void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
+  CHECK(!has_new_target());
   // The displacement is the offset of the last parameter (if any)
   // relative to the frame pointer.
   const int kDisplacement =
       StandardFrameConstants::kCallerSPOffset - kPointerSize;
   DCHECK(r1.is(ArgumentsAccessReadDescriptor::index()));
   DCHECK(r0.is(ArgumentsAccessReadDescriptor::parameter_count()));
 
   // Check that the key is a smi.
   Label slow;
   __ JumpIfNotSmi(r1, &slow);
@@ skipping 37 matching lines @@
   __ push(r1);
   __ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1);
 }
 
 
 void ArgumentsAccessStub::GenerateNewSloppySlow(MacroAssembler* masm) {
   // sp[0] : number of parameters
   // sp[4] : receiver displacement
   // sp[8] : function
 
+  CHECK(!has_new_target());
+
   // Check if the calling frame is an arguments adaptor frame.
   Label runtime;
   __ ldr(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ ldr(r2, MemOperand(r3, StandardFrameConstants::kContextOffset));
   __ cmp(r2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
   __ b(ne, &runtime);
 
   // Patch the arguments.length and the parameters pointer in the current frame.
   __ ldr(r2, MemOperand(r3, ArgumentsAdaptorFrameConstants::kLengthOffset));
   __ str(r2, MemOperand(sp, 0 * kPointerSize));
   __ add(r3, r3, Operand(r2, LSL, 1));
   __ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
   __ str(r3, MemOperand(sp, 1 * kPointerSize));
 
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kNewSloppyArguments, 3, 1);
 }
 
 
 void ArgumentsAccessStub::GenerateNewSloppyFast(MacroAssembler* masm) {
   // Stack layout:
   //  sp[0] : number of parameters (tagged)
   //  sp[4] : address of receiver argument
   //  sp[8] : function
   // Registers used over whole function:
   //  r6 : allocated object (tagged)
   //  r9 : mapped parameter count (tagged)
 
+  CHECK(!has_new_target());
+
   __ ldr(r1, MemOperand(sp, 0 * kPointerSize));
   // r1 = parameter count (tagged)
 
   // Check if the calling frame is an arguments adaptor frame.
   Label runtime;
   Label adaptor_frame, try_allocate;
   __ ldr(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ ldr(r2, MemOperand(r3, StandardFrameConstants::kContextOffset));
   __ cmp(r2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
   __ b(eq, &adaptor_frame);
@@ skipping 220 matching lines @@
   __ cmp(r3, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
   __ b(eq, &adaptor_frame);
 
   // Get the length from the frame.
   __ ldr(r1, MemOperand(sp, 0));
   __ b(&try_allocate);
 
   // Patch the arguments.length and the parameters pointer.
   __ bind(&adaptor_frame);
   __ ldr(r1, MemOperand(r2, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  if (has_new_target()) {
+    // Subtract 1 from smi-tagged arguments count.
+    __ sub(r1, r1, Operand(2));
+  }
   __ str(r1, MemOperand(sp, 0));
   __ add(r3, r2, Operand::PointerOffsetFromSmiKey(r1));
   __ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
   __ str(r3, MemOperand(sp, 1 * kPointerSize));
 
   // Try the new space allocation. Start out with computing the size
   // of the arguments object and the elements array in words.
   Label add_arguments_object;
   __ bind(&try_allocate);
   __ SmiUntag(r1, SetCC);
@@ skipping 731 matching lines @@
       __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
       __ b(eq, &feedback_register_initialized);
       __ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
       __ bind(&feedback_register_initialized);
     }
 
     __ AssertUndefinedOrAllocationSite(r2, r5);
   }
 
   // Pass function as original constructor.
-  __ mov(r3, r1);
+  if (IsSuperConstructorCall()) {
+    __ mov(r4, Operand(1 * kPointerSize));
+    __ add(r4, r4, Operand(r0, LSL, kPointerSizeLog2));
+    __ ldr(r3, MemOperand(sp, r4));
+  } else {
+    __ mov(r3, r1);
+  }
 
   // Jump to the function-specific construct stub.
   Register jmp_reg = r4;
   __ ldr(jmp_reg, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
   __ ldr(jmp_reg, FieldMemOperand(jmp_reg,
                                   SharedFunctionInfo::kConstructStubOffset));
   __ add(pc, jmp_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
 
   // r0: number of arguments
   // r1: called object
@@ skipping 2385 matching lines @@
                            kStackUnwindSpace, NULL,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM