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

src/ia32/full-codegen-ia32.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_IA32
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 246 matching lines @@
     // The stub will rewrite receiver and parameter count if the previous
     // stack frame was an arguments adapter frame.
     ArgumentsAccessStub::Type type;
     if (is_strict(language_mode())) {
       type = ArgumentsAccessStub::NEW_STRICT;
     } else if (function()->has_duplicate_parameters()) {
       type = ArgumentsAccessStub::NEW_SLOPPY_SLOW;
     } else {
       type = ArgumentsAccessStub::NEW_SLOPPY_FAST;
     }
-    ArgumentsAccessStub stub(isolate(), type);
+    ArgumentsAccessStub::HasNewTarget has_new_target =
+        IsSubclassConstructor(info->function()->kind())
+            ? ArgumentsAccessStub::HAS_NEW_TARGET
+            : ArgumentsAccessStub::NO_NEW_TARGET;
+    ArgumentsAccessStub stub(isolate(), type, has_new_target);
     __ CallStub(&stub);
 
     SetVar(arguments, eax, ebx, edx);
   }
 
   if (FLAG_trace) {
     __ CallRuntime(Runtime::kTraceEnter, 0);
   }
 
   // Visit the declarations and body unless there is an illegal
@@ skipping 128 matching lines @@
     masm_->bind(&check_exit_codesize);
 #endif
     SetSourcePosition(function()->end_position() - 1);
     __ RecordJSReturn();
     // Do not use the leave instruction here because it is too short to
     // patch with the code required by the debugger.
     __ mov(esp, ebp);
     int no_frame_start = masm_->pc_offset();
     __ pop(ebp);
 
-    int arguments_bytes = (info_->scope()->num_parameters() + 1) * kPointerSize;
+    int arg_count = info_->scope()->num_parameters() + 1;
+    if (FLAG_experimental_classes &&
+        IsSubclassConstructor(info_->function()->kind())) {
+      arg_count++;
+    }
+    int arguments_bytes = arg_count * kPointerSize;
     __ Ret(arguments_bytes, ecx);
     // Check that the size of the code used for returning is large enough
     // for the debugger's requirements.
     DCHECK(Assembler::kJSReturnSequenceLength <=
            masm_->SizeOfCodeGeneratedSince(&check_exit_codesize));
     info_->AddNoFrameRange(no_frame_start, masm_->pc_offset());
   }
 }
 
 
@@ skipping 2703 matching lines @@
   __ mov(edx, Immediate(SmiFromSlot(expr->CallNewFeedbackSlot())));
 
   CallConstructStub stub(isolate(), RECORD_CONSTRUCTOR_TARGET);
   __ call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
   PrepareForBailoutForId(expr->ReturnId(), TOS_REG);
   context()->Plug(eax);
 }
 
 
 void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
+  Variable* new_target_var = scope()->DeclarationScope()->new_target_var();
+  GetVar(eax, new_target_var);
+  __ push(eax);
+
   SuperReference* super_ref = expr->expression()->AsSuperReference();
   EmitLoadSuperConstructor(super_ref);
   __ push(result_register());
 
   Variable* this_var = super_ref->this_var()->var();
   GetVar(eax, this_var);
   __ cmp(eax, isolate()->factory()->the_hole_value());
   Label uninitialized_this;
   __ j(equal, &uninitialized_this);
   __ push(Immediate(this_var->name()));
@@ skipping 21 matching lines @@
     /* TODO(dslomov): support pretenuring.
     EnsureSlotContainsAllocationSite(expr->AllocationSiteFeedbackSlot());
     DCHECK(expr->AllocationSiteFeedbackSlot().ToInt() ==
            expr->CallNewFeedbackSlot().ToInt() + 1);
     */
   }
 
   __ LoadHeapObject(ebx, FeedbackVector());
   __ mov(edx, Immediate(SmiFromSlot(expr->CallFeedbackSlot())));
 
-  // TODO(dslomov): use a different stub and propagate new.target.
-  CallConstructStub stub(isolate(), RECORD_CONSTRUCTOR_TARGET);
+  CallConstructStub stub(isolate(), SUPER_CALL_RECORD_TARGET);
   __ call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
   RecordJSReturnSite(expr);
 
+  __ Drop(1);
+
   EmitVariableAssignment(this_var, Token::INIT_CONST);
   context()->Plug(eax);
 }
 
 
 void FullCodeGenerator::EmitIsSmi(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);
 
   VisitForAccumulatorValue(args->at(0));
@@ skipping 2095 matching lines @@
   DCHECK_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32