Implement loads and calls from 'super'

src/x64/full-codegen-x64.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_X64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 1294 matching lines @@
   context()->Plug(rax);
 }
 
 
 void FullCodeGenerator::VisitVariableProxy(VariableProxy* expr) {
   Comment cmnt(masm_, "[ VariableProxy");
   EmitVariableLoad(expr);
 }
 
 
+void FullCodeGenerator::EmitLoadHomeObject(SuperReference* expr) {
+  Comment cnmt(masm_, "[ SuperReference ");
+
+  __ movp(LoadDescriptor::ReceiverRegister(),
+          Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
+
+  Handle<Symbol> home_object_symbol(isolate()->heap()->home_object_symbol());
+  __ Move(LoadDescriptor::NameRegister(), home_object_symbol);
+
+  CallLoadIC(NOT_CONTEXTUAL, expr->HomeObjectFeedbackId());
+
+  __ Cmp(rax, isolate()->factory()->undefined_value());
+  Label done;
+  __ j(not_equal, &done);
+  __ CallRuntime(Runtime::kThrowNonMethodError, 0);
+  __ bind(&done);
+}
+
+
 void FullCodeGenerator::EmitLoadGlobalCheckExtensions(VariableProxy* proxy,
                                                       TypeofState typeof_state,
                                                       Label* slow) {
   Register context = rsi;
   Register temp = rdx;
 
   Scope* s = scope();
   while (s != NULL) {
     if (s->num_heap_slots() > 0) {
       if (s->calls_sloppy_eval()) {
@@ skipping 931 matching lines @@
   if (FLAG_vector_ics) {
     __ Move(VectorLoadICDescriptor::SlotRegister(),
             Smi::FromInt(prop->PropertyFeedbackSlot()));
     CallLoadIC(NOT_CONTEXTUAL);
   } else {
     CallLoadIC(NOT_CONTEXTUAL, prop->PropertyFeedbackId());
   }
 }
 
 
+void FullCodeGenerator::EmitNamedSuperPropertyLoad(Property* prop) {
+  SetSourcePosition(prop->position());
+  Literal* key = prop->key()->AsLiteral();
+  DCHECK(!key->value()->IsSmi());
+  DCHECK(prop->IsSuperAccess());
+
+  SuperReference* super_ref = prop->obj()->AsSuperReference();
+  EmitLoadHomeObject(super_ref);
+  __ Push(rax);
+  VisitForStackValue(super_ref->this_var());
+  __ Push(key->value());
+  __ CallRuntime(Runtime::kLoadFromSuper, 3);
+}
+
+
 void FullCodeGenerator::EmitKeyedPropertyLoad(Property* prop) {
   SetSourcePosition(prop->position());
   Handle<Code> ic = CodeFactory::KeyedLoadIC(isolate()).code();
   if (FLAG_vector_ics) {
     __ Move(VectorLoadICDescriptor::SlotRegister(),
             Smi::FromInt(prop->PropertyFeedbackSlot()));
     CallIC(ic);
   } else {
     CallIC(ic, prop->PropertyFeedbackId());
   }
@@ skipping 230 matching lines @@
   PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
   context()->Plug(rax);
 }
 
 
 void FullCodeGenerator::VisitProperty(Property* expr) {
   Comment cmnt(masm_, "[ Property");
   Expression* key = expr->key();
 
   if (key->IsPropertyName()) {
-    VisitForAccumulatorValue(expr->obj());
-    DCHECK(!rax.is(LoadDescriptor::ReceiverRegister()));
-    __ movp(LoadDescriptor::ReceiverRegister(), rax);
-    EmitNamedPropertyLoad(expr);
+    if (!expr->IsSuperAccess()) {
+      VisitForAccumulatorValue(expr->obj());
+      DCHECK(!rax.is(LoadDescriptor::ReceiverRegister()));
+      __ movp(LoadDescriptor::ReceiverRegister(), rax);
+      EmitNamedPropertyLoad(expr);
+    } else {
+      EmitNamedSuperPropertyLoad(expr);
+    }
     PrepareForBailoutForId(expr->LoadId(), TOS_REG);
     context()->Plug(rax);
   } else {
     VisitForStackValue(expr->obj());
     VisitForAccumulatorValue(expr->key());
     __ Move(LoadDescriptor::NameRegister(), rax);
     __ Pop(LoadDescriptor::ReceiverRegister());
     EmitKeyedPropertyLoad(expr);
     context()->Plug(rax);
   }
@@ skipping 18 matching lines @@
     { StackValueContext context(this);
       EmitVariableLoad(callee->AsVariableProxy());
       PrepareForBailout(callee, NO_REGISTERS);
     }
     // Push undefined as receiver. This is patched in the method prologue if it
     // is a sloppy mode method.
     __ Push(isolate()->factory()->undefined_value());
   } else {
     // Load the function from the receiver.
     DCHECK(callee->IsProperty());
+    DCHECK(!callee->AsProperty()->IsSuperAccess());
     __ movp(LoadDescriptor::ReceiverRegister(), Operand(rsp, 0));
     EmitNamedPropertyLoad(callee->AsProperty());
     PrepareForBailoutForId(callee->AsProperty()->LoadId(), TOS_REG);
     // Push the target function under the receiver.
     __ Push(Operand(rsp, 0));
     __ movp(Operand(rsp, kPointerSize), rax);
   }
 
   EmitCall(expr, call_type);
 }
 
 
+void FullCodeGenerator::EmitSuperCallWithLoadIC(Call* expr) {
+  Expression* callee = expr->expression();
+  DCHECK(callee->IsProperty());
+  Property* prop = callee->AsProperty();
+  DCHECK(prop->IsSuperAccess());
+
+  SetSourcePosition(prop->position());
+  Literal* key = prop->key()->AsLiteral();
+  DCHECK(!key->value()->IsSmi());
+  // Load the function from the receiver.
+  SuperReference* super_ref = prop->obj()->AsSuperReference();
+  EmitLoadHomeObject(super_ref);
+  __ Push(rax);
+  VisitForAccumulatorValue(super_ref->this_var());
+  __ Push(rax);
+  __ Push(Operand(rsp, kPointerSize));
+  __ Push(rax);
+  __ Push(key->value());
+
+  // Stack here:
+  //  - home_object
+  //  - this (receiver)
+  //  - home_object <-- LoadFromSuper will pop here and below.
+  //  - this (receiver)
+  //  - key
+  __ CallRuntime(Runtime::kLoadFromSuper, 3);
+
+  // Replace home_object with target function.
+  __ movp(Operand(rsp, kPointerSize), rax);
+
+  // Stack here:
+  // - target function
+  // - this (receiver)
+  EmitCall(expr, CallICState::METHOD);
+}
+
+
 // Common code for calls using the IC.
 void FullCodeGenerator::EmitKeyedCallWithLoadIC(Call* expr,
                                                 Expression* key) {
   // Load the key.
   VisitForAccumulatorValue(key);
 
   Expression* callee = expr->expression();
 
   // Load the function from the receiver.
   DCHECK(callee->IsProperty());
@@ skipping 141 matching lines @@
       // passing the hole to the call function stub.
       __ PushRoot(Heap::kUndefinedValueRootIndex);
       __ bind(&call);
     }
 
     // The receiver is either the global receiver or an object found by
     // LoadContextSlot.
     EmitCall(expr);
   } else if (call_type == Call::PROPERTY_CALL) {
     Property* property = callee->AsProperty();
-    { PreservePositionScope scope(masm()->positions_recorder());
-      VisitForStackValue(property->obj());
-    }
-    if (property->key()->IsPropertyName()) {
-      EmitCallWithLoadIC(expr);
+    bool is_named_call = property->key()->IsPropertyName();
+    // super.x() is handled in EmitCallWithLoadIC.
+    if (property->IsSuperAccess() && is_named_call) {
+      EmitSuperCallWithLoadIC(expr);
     } else {
-      EmitKeyedCallWithLoadIC(expr, property->key());
+      {
+        PreservePositionScope scope(masm()->positions_recorder());
+        VisitForStackValue(property->obj());
+      }
+      if (is_named_call) {
+        EmitCallWithLoadIC(expr);
+      } else {
+        EmitKeyedCallWithLoadIC(expr, property->key());
+      }
     }
   } else {
     DCHECK(call_type == Call::OTHER_CALL);
     // Call to an arbitrary expression not handled specially above.
     { PreservePositionScope scope(masm()->positions_recorder());
       VisitForStackValue(callee);
     }
     __ PushRoot(Heap::kUndefinedValueRootIndex);
     // Emit function call.
     EmitCall(expr);
@@ skipping 2085 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_X64