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// Copyright 2014 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.
#ifndef V8_COMPILER_INT64_LOWERING_H_
#define V8_COMPILER_INT64_LOWERING_H_
#include "src/common/globals.h"
#include "src/compiler/common-operator.h"
#include "src/compiler/graph.h"
#include "src/compiler/machine-operator.h"
#include "src/compiler/node-marker.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
template <typename T>
class Signature;
namespace compiler {
// Struct for CallDescriptors that need special lowering.
struct V8_EXPORT_PRIVATE Int64LoweringSpecialCase {
Int64LoweringSpecialCase()
: bigint_to_i64_call_descriptor(nullptr),
i64_to_bigint_call_descriptor(nullptr),
bigint_to_i32_pair_call_descriptor(nullptr),
i32_pair_to_bigint_call_descriptor(nullptr) {}
// CallDescriptors that need special lowering.
CallDescriptor* bigint_to_i64_call_descriptor;
CallDescriptor* i64_to_bigint_call_descriptor;
// The replacement CallDescriptors.
CallDescriptor* bigint_to_i32_pair_call_descriptor;
CallDescriptor* i32_pair_to_bigint_call_descriptor;
};
class V8_EXPORT_PRIVATE Int64Lowering {
public:
Int64Lowering(
Graph* graph, MachineOperatorBuilder* machine,
CommonOperatorBuilder* common, Zone* zone,
Signature<MachineRepresentation>* signature,
std::unique_ptr<Int64LoweringSpecialCase> special_case = nullptr);
void LowerGraph();
static int GetParameterCountAfterLowering(
Signature<MachineRepresentation>* signature);
private:
enum class State : uint8_t { kUnvisited, kOnStack, kVisited };
struct Replacement {
Node* low;
Node* high;
};
Zone* zone() const { return zone_; }
Graph* graph() const { return graph_; }
MachineOperatorBuilder* machine() const { return machine_; }
CommonOperatorBuilder* common() const { return common_; }
Signature<MachineRepresentation>* signature() const { return signature_; }
void PushNode(Node* node);
void LowerNode(Node* node);
bool DefaultLowering(Node* node, bool low_word_only = false);
void LowerComparison(Node* node, const Operator* signed_op,
const Operator* unsigned_op);
void LowerWord64AtomicBinop(Node* node, const Operator* op);
void LowerWord64AtomicNarrowOp(Node* node, const Operator* op);
CallDescriptor* LowerCallDescriptor(const CallDescriptor* call_descriptor);
void ReplaceNode(Node* old, Node* new_low, Node* new_high);
bool HasReplacementLow(Node* node);
Node* GetReplacementLow(Node* node);
bool HasReplacementHigh(Node* node);
Node* GetReplacementHigh(Node* node);
void PreparePhiReplacement(Node* phi);
void GetIndexNodes(Node* index, Node** index_low, Node** index_high);
void ReplaceNodeWithProjections(Node* node);
void LowerMemoryBaseAndIndex(Node* node);
struct NodeState {
Node* node;
int input_index;
};
Zone* zone_;
Graph* const graph_;
MachineOperatorBuilder* machine_;
CommonOperatorBuilder* common_;
NodeMarker<State> state_;
ZoneDeque<NodeState> stack_;
Replacement* replacements_;
Signature<MachineRepresentation>* signature_;
Node* placeholder_;
std::unique_ptr<Int64LoweringSpecialCase> special_case_;
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_INT64_LOWERING_H_
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