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//===- GIMatchDagEdge.h - Represent a shared operand list for nodes -------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_UTILS_TABLEGEN_GIMATCHDAGEDGE_H
#define LLVM_UTILS_TABLEGEN_GIMATCHDAGEDGE_H
#include "llvm/ADT/StringRef.h"
namespace llvm {
class raw_ostream;
class GIMatchDagInstr;
class GIMatchDagOperand;
/// Represents an edge that connects two instructions together via a pair of
/// operands. For example:
/// %a = FOO ...
/// %0 = BAR %a
/// %1 = BAZ %a
/// would have two edges for %a like so:
/// BAR:Op#1 --[a]----> Op#0:FOO
/// ^
/// BAZ:Op#1 --[a]------/
/// Ideally, all edges in the DAG are from a use to a def as this is a many
/// to one edge but edges from defs to uses are supported too.
class GIMatchDagEdge {
/// The name of the edge. For example,
/// (FOO $a, $b, $c)
/// (BAR $d, $e, $a)
/// will create an edge named 'a' to connect FOO to BAR. Although the name
/// refers to the edge, the canonical value of 'a' is the operand that defines
/// it.
StringRef Name;
const GIMatchDagInstr *FromMI;
const GIMatchDagOperand *FromMO;
const GIMatchDagInstr *ToMI;
const GIMatchDagOperand *ToMO;
public:
GIMatchDagEdge(StringRef Name, const GIMatchDagInstr *FromMI, const GIMatchDagOperand *FromMO,
const GIMatchDagInstr *ToMI, const GIMatchDagOperand *ToMO)
: Name(Name), FromMI(FromMI), FromMO(FromMO), ToMI(ToMI), ToMO(ToMO) {}
StringRef getName() const { return Name; }
const GIMatchDagInstr *getFromMI() const { return FromMI; }
const GIMatchDagOperand *getFromMO() const { return FromMO; }
const GIMatchDagInstr *getToMI() const { return ToMI; }
const GIMatchDagOperand *getToMO() const { return ToMO; }
/// Flip the direction of the edge.
void reverse();
/// Does this edge run from a def to (one of many) uses?
bool isDefToUse() const;
LLVM_DUMP_METHOD void print(raw_ostream &OS) const;
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void dump() const;
#endif // if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
};
raw_ostream &operator<<(raw_ostream &OS, const GIMatchDagEdge &E);
} // end namespace llvm
#endif // ifndef LLVM_UTILS_TABLEGEN_GIMATCHDAGEDGE_H
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