X87: new classes: implement default constructors

src/x87/full-codegen-x87.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_X87
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 2925 matching lines @@
   __ push(Immediate(Smi::FromInt(language_mode())));
 
   // Push the start position of the scope the calls resides in.
   __ push(Immediate(Smi::FromInt(scope()->start_position())));
 
   // Do the runtime call.
   __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 6);
 }
 
 
-void FullCodeGenerator::EmitLoadSuperConstructor(SuperReference* super_ref) {
-  DCHECK(super_ref != NULL);
+void FullCodeGenerator::EmitLoadSuperConstructor() {
   __ push(Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
   __ CallRuntime(Runtime::kGetPrototype, 1);
 }
 
 
 void FullCodeGenerator::VisitCall(Call* expr) {
 #ifdef DEBUG
   // We want to verify that RecordJSReturnSite gets called on all paths
   // through this function.  Avoid early returns.
   expr->return_is_recorded_ = false;
@@ skipping 97 matching lines @@
         EmitCallWithLoadIC(expr);
       } else {
         EmitKeyedCallWithLoadIC(expr, property->key());
       }
     }
   } else if (call_type == Call::SUPER_CALL) {
     if (FLAG_experimental_classes) {
       EmitSuperConstructorCall(expr);
     } else {
       SuperReference* super_ref = callee->AsSuperReference();
-      EmitLoadSuperConstructor(super_ref);
+      EmitLoadSuperConstructor();
       __ push(result_register());
       VisitForStackValue(super_ref->this_var());
       EmitCall(expr, CallICState::METHOD);
     }
   } else {
     DCHECK(call_type == Call::OTHER_CALL);
     // Call to an arbitrary expression not handled specially above.
     { PreservePositionScope scope(masm()->positions_recorder());
       VisitForStackValue(callee);
     }
@@ skipping 52 matching lines @@
   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);
+  EmitLoadSuperConstructor();
   __ 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()));
   __ CallRuntime(Runtime::kThrowReferenceError, 1);
   __ bind(&uninitialized_this);
@@ skipping 901 matching lines @@
 
   __ bind(&runtime);
   __ push(eax);
   __ CallRuntime(Runtime::kCall, args->length());
   __ bind(&done);
 
   context()->Plug(eax);
 }
 
 
+void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
+  Variable* new_target_var = scope()->DeclarationScope()->new_target_var();
+  GetVar(eax, new_target_var);
+  __ push(eax);
+
+  EmitLoadSuperConstructor();
+  __ push(result_register());
+
+  // Check if the calling frame is an arguments adaptor frame.
+  Label adaptor_frame, args_set_up, runtime;
+  __ mov(edx, Operand(ebp, StandardFrameConstants::kCallerFPOffset));
+  __ mov(ecx, Operand(edx, StandardFrameConstants::kContextOffset));
+  __ cmp(ecx, Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
+  __ j(equal, &adaptor_frame);
+  // default constructor has no arguments, so no adaptor frame means no args.
+  __ mov(eax, Immediate(0));
+  __ jmp(&args_set_up);
+
+  // Copy arguments from adaptor frame.
+  {
+    __ bind(&adaptor_frame);
+    __ mov(ecx, Operand(edx, ArgumentsAdaptorFrameConstants::kLengthOffset));
+    __ SmiUntag(ecx);
+
+    // Subtract 1 from arguments count, for new.target.
+    __ sub(ecx, Immediate(1));
+    __ mov(eax, ecx);
+    __ lea(edx, Operand(edx, ecx, times_pointer_size,
+                        StandardFrameConstants::kCallerSPOffset));
+    Label loop;
+    __ bind(&loop);
+    __ push(Operand(edx, -1 * kPointerSize));
+    __ sub(edx, Immediate(kPointerSize));
+    __ dec(ecx);
+    __ j(not_zero, &loop);
+  }
+
+  __ bind(&args_set_up);
+  __ mov(edi, Operand(esp, eax, times_pointer_size, 0));
+
+  CallConstructStub stub(isolate(), SUPER_CONSTRUCTOR_CALL);
+  __ call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
+
+  __ Drop(1);
+
+  context()->Plug(eax);
+}
+
+
 void FullCodeGenerator::EmitRegExpConstructResult(CallRuntime* expr) {
   // Load the arguments on the stack and call the stub.
   RegExpConstructResultStub stub(isolate());
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 3);
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
   VisitForAccumulatorValue(args->at(2));
   __ pop(ebx);
   __ pop(ecx);
@@ skipping 1219 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_X87