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// Copyright 2015 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/compiler/js-frame-specialization.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/linkage.h"
#include "src/frames-inl.h"
namespace v8 {
namespace internal {
namespace compiler {
Reduction JSFrameSpecialization::Reduce(Node* node) {
switch (node->opcode()) {
case IrOpcode::kOsrValue:
return ReduceOsrValue(node);
case IrOpcode::kParameter:
return ReduceParameter(node);
default:
break;
}
return NoChange();
}
Reduction JSFrameSpecialization::ReduceOsrValue(Node* node) {
DCHECK_EQ(IrOpcode::kOsrValue, node->opcode());
DisallowHeapAllocation no_gc;
Object* object;
int const index = OpParameter<int>(node);
int const parameters_count = frame()->ComputeParametersCount() + 1;
if (index == Linkage::kOsrContextSpillSlotIndex) {
object = frame()->context();
} else if (index >= parameters_count) {
object = frame()->GetExpression(index - parameters_count);
} else {
// The OsrValue index 0 is the receiver.
object = index ? frame()->GetParameter(index - 1) : frame()->receiver();
}
return Replace(jsgraph()->Constant(handle(object, isolate())));
}
Reduction JSFrameSpecialization::ReduceParameter(Node* node) {
DCHECK_EQ(IrOpcode::kParameter, node->opcode());
DisallowHeapAllocation no_gc;
Object* object;
int const index = ParameterIndexOf(node->op());
int const parameters_count = frame()->ComputeParametersCount() + 1;
if (index == Linkage::kJSFunctionCallClosureParamIndex) {
object = frame()->function();
} else if (index == parameters_count) {
// The Parameter index (arity + 1) is the parameter count.
object = Smi::FromInt(parameters_count - 1);
} else if (index == parameters_count + 1) {
// The Parameter index (arity + 2) is the context.
object = frame()->context();
} else {
// The Parameter index 0 is the receiver.
object = index ? frame()->GetParameter(index - 1) : frame()->receiver();
}
return Replace(jsgraph()->Constant(handle(object, isolate())));
}
Isolate* JSFrameSpecialization::isolate() const { return jsgraph()->isolate(); }
} // namespace compiler
} // namespace internal
} // namespace v8
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