mlir-hlo/tools/mlir-tblgen-builder/TableGen/Predicate.h

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2021-07-23 11:38:34 +08:00
//===- Predicate.h - Predicate class ----------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Wrapper around predicates defined in TableGen.
//
//===----------------------------------------------------------------------===//
#ifndef MLIR_TABLEGEN_PREDICATE_H_
#define MLIR_TABLEGEN_PREDICATE_H_
#include "mlir/Support/LLVM.h"
#include <string>
#include <vector>
namespace llvm {
class Init;
class ListInit;
class Record;
class SMLoc;
} // end namespace llvm
namespace mlir {
namespace tblgen {
// A logical predicate. This class must closely follow the definition of
// TableGen class 'Pred'.
class Pred {
public:
// Constructs the null Predicate (e.g., always true).
explicit Pred() : def(nullptr) {}
// Construct a Predicate from a record.
explicit Pred(const llvm::Record *record);
// Construct a Predicate from an initializer.
explicit Pred(const llvm::Init *init);
// Check if the predicate is defined. Callers may use this to interpret the
// missing predicate as either true (e.g. in filters) or false (e.g. in
// precondition verification).
bool isNull() const { return def == nullptr; }
// Get the predicate condition. This may dispatch to getConditionImpl() of
// the underlying predicate type.
std::string getCondition() const;
// Whether the predicate is a combination of other predicates, i.e. an
// record of type CombinedPred.
bool isCombined() const;
// Records are pointer-comparable.
bool operator==(const Pred &other) const { return def == other.def; }
// Get the location of the predicate.
ArrayRef<llvm::SMLoc> getLoc() const;
protected:
// The TableGen definition of this predicate.
const llvm::Record *def;
};
// A logical predicate wrapping a C expression. This class must closely follow
// the definition of TableGen class 'CPred'.
class CPred : public Pred {
public:
// Construct a CPred from a record.
explicit CPred(const llvm::Record *record);
// Construct a CPred an initializer.
explicit CPred(const llvm::Init *init);
// Get the predicate condition.
std::string getConditionImpl() const;
};
// A logical predicate that is a combination of other predicates. This class
// must closely follow the definition of TableGen class 'CombinedPred'.
class CombinedPred : public Pred {
public:
// Construct a CombinedPred from a record.
explicit CombinedPred(const llvm::Record *record);
// Construct a CombinedPred from an initializer.
explicit CombinedPred(const llvm::Init *init);
// Get the predicate condition.
std::string getConditionImpl() const;
// Get the definition of the combiner used in this predicate.
const llvm::Record *getCombinerDef() const;
// Get the predicates that are combined by this predicate.
const std::vector<llvm::Record *> getChildren() const;
};
// A combined predicate that requires all child predicates of 'CPred' type to
// have their expression rewritten with a simple string substitution rule.
class SubstLeavesPred : public CombinedPred {
public:
// Get the replacement pattern.
StringRef getPattern() const;
// Get the string used to replace the pattern.
StringRef getReplacement() const;
};
// A combined predicate that prepends a prefix and appends a suffix to the
// predicate string composed from a child predicate.
class ConcatPred : public CombinedPred {
public:
StringRef getPrefix() const;
StringRef getSuffix() const;
};
} // end namespace tblgen
} // end namespace mlir
#endif // MLIR_TABLEGEN_PREDICATE_H_