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

src/mips64/code-stubs-mips64.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_MIPS64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 1567 matching lines @@
 
   NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, a4,
                                                           a5, &miss);
   __ bind(&miss);
   PropertyAccessCompiler::TailCallBuiltin(
       masm, PropertyAccessCompiler::MissBuiltin(Code::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(a1.is(ArgumentsAccessReadDescriptor::index()));
   DCHECK(a0.is(ArgumentsAccessReadDescriptor::parameter_count()));
 
   // Check that the key is a smiGenerateReadElement.
   Label slow;
   __ JumpIfNotSmi(a1, &slow);
@@ skipping 38 matching lines @@
   __ bind(&slow);
   __ push(a1);
   __ 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;
   __ ld(a3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ ld(a2, MemOperand(a3, StandardFrameConstants::kContextOffset));
   __ Branch(&runtime,
             ne,
             a2,
             Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
 
   // Patch the arguments.length and the parameters pointer in the current frame.
@@ skipping 11 matching lines @@
 
 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:
   //  a6 : allocated object (tagged)
   //  t1 : mapped parameter count (tagged)
 
+  CHECK(!has_new_target());
+
   __ ld(a1, MemOperand(sp, 0 * kPointerSize));
   // a1 = parameter count (tagged)
 
   // Check if the calling frame is an arguments adaptor frame.
   Label runtime;
   Label adaptor_frame, try_allocate;
   __ ld(a3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ ld(a2, MemOperand(a3, StandardFrameConstants::kContextOffset));
   __ Branch(&adaptor_frame,
             eq,
@@ skipping 236 matching lines @@
             a3,
             Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
 
   // Get the length from the frame.
   __ ld(a1, MemOperand(sp, 0));
   __ Branch(&try_allocate);
 
   // Patch the arguments.length and the parameters pointer.
   __ bind(&adaptor_frame);
   __ ld(a1, MemOperand(a2, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  if (has_new_target()) {
+    // Subtract 1 from smi-tagged arguments count.
+    __ SmiUntag(a1);
+    __ Daddu(a1, a1, Operand(-1));
+    __ SmiTag(a1);
+  }
   __ sd(a1, MemOperand(sp, 0));
   __ SmiScale(at, a1, kPointerSizeLog2);
 
   __ Daddu(a3, a2, Operand(at));
 
   __ Daddu(a3, a3, Operand(StandardFrameConstants::kCallerSPOffset));
   __ sd(a3, 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.
@@ skipping 790 matching lines @@
       __ LoadRoot(at, Heap::kAllocationSiteMapRootIndex);
       __ Branch(&feedback_register_initialized, eq, a5, Operand(at));
       __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
       __ bind(&feedback_register_initialized);
     }
 
     __ AssertUndefinedOrAllocationSite(a2, a5);
   }
 
   // Pass function as original constructor.
-  __ mov(a3, a1);
+  if (IsSuperConstructorCall()) {
+    __ li(a4, Operand(1 * kPointerSize));
+    __ dsll(at, a0, kPointerSizeLog2);
+    __ daddu(a4, a4, at);
+    __ daddu(at, sp, a4);
+    __ ld(a3, MemOperand(at, 0));
+  } else {
+    __ mov(a3, a1);
+  }
 
   // Jump to the function-specific construct stub.
   Register jmp_reg = a4;
   __ ld(jmp_reg, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
   __ ld(jmp_reg, FieldMemOperand(jmp_reg,
                                  SharedFunctionInfo::kConstructStubOffset));
   __ Daddu(at, jmp_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ Jump(at);
 
   // a0: number of arguments
@@ skipping 2455 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS64