MLIR  16.0.0git
Constraint.h
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1 //===- Constraint.h - Constraint class --------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Constraint wrapper to simplify using TableGen Record for constraints.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef MLIR_TABLEGEN_CONSTRAINT_H_
14 #define MLIR_TABLEGEN_CONSTRAINT_H_
15 
16 #include "mlir/Support/LLVM.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/ADT/StringRef.h"
20 
21 namespace llvm {
22 class Record;
23 } // namespace llvm
24 
25 namespace mlir {
26 namespace tblgen {
27 
28 // Wrapper class with helper methods for accessing Constraint defined in
29 // TableGen.
30 class Constraint {
31 public:
32  // Constraint kind
33  enum Kind { CK_Attr, CK_Region, CK_Successor, CK_Type, CK_Uncategorized };
34 
35  // Create a constraint with a TableGen definition and a kind.
36  Constraint(const llvm::Record *record, Kind kind) : def(record), kind(kind) {}
37  // Create a constraint with a TableGen definition, and infer the kind.
38  Constraint(const llvm::Record *record);
39 
40  /// Constraints are pointer-comparable.
41  bool operator==(const Constraint &that) { return def == that.def; }
42  bool operator!=(const Constraint &that) { return def != that.def; }
43 
44  // Returns the predicate for this constraint.
45  Pred getPredicate() const;
46 
47  // Returns the condition template that can be used to check if a type or
48  // attribute satisfies this constraint. The template may contain "{0}" that
49  // must be substituted with an expression returning an mlir::Type or
50  // mlir::Attribute.
51  std::string getConditionTemplate() const;
52 
53  // Returns the user-readable summary of this constraint. If the summary is not
54  // provided, returns the TableGen def name.
55  StringRef getSummary() const;
56 
57  // Returns the long-form description of this constraint. If the description is
58  // not provided, returns an empty string.
59  StringRef getDescription() const;
60 
61  /// Returns the name of the TablGen def of this constraint. In some cases
62  /// where the current def is anonymous, the name of the base def is used (e.g.
63  /// `Optional<>`/`Variadic<>` type constraints).
64  StringRef getDefName() const;
65 
66  /// Returns a unique name for the TablGen def of this constraint. This is
67  /// generally just the name of the def, but in some cases where the current
68  /// def is anonymous, the name of the base def is attached (to provide more
69  /// context on the def).
70  std::string getUniqueDefName() const;
71 
72  Kind getKind() const { return kind; }
73 
74 protected:
75  // The TableGen definition of this constraint.
76  const llvm::Record *def;
77 
78 private:
79  /// Return the name of the base def if there is one, or None otherwise.
80  Optional<StringRef> getBaseDefName() const;
81 
82  // What kind of constraint this is.
83  Kind kind;
84 };
85 
86 // An constraint and the concrete entities to place the constraint on.
88  AppliedConstraint(Constraint &&constraint, StringRef self,
89  std::vector<std::string> &&entities);
90 
92  // The symbol to replace `$_self` special placeholder in the constraint.
93  std::string self;
94  // The symbols to replace `$N` positional placeholders in the constraint.
95  std::vector<std::string> entities;
96 };
97 
98 } // namespace tblgen
99 } // namespace mlir
100 
101 namespace llvm {
102 /// Unique constraints by their predicate and summary. Constraints that share
103 /// the same predicate may have different descriptions; ensure that the
104 /// correct error message is reported when verification fails.
105 template <>
106 struct DenseMapInfo<mlir::tblgen::Constraint> {
108 
109  static mlir::tblgen::Constraint getEmptyKey();
110  static mlir::tblgen::Constraint getTombstoneKey();
111  static unsigned getHashValue(mlir::tblgen::Constraint constraint);
112  static bool isEqual(mlir::tblgen::Constraint lhs,
114 };
115 } // namespace llvm
116 
117 #endif // MLIR_TABLEGEN_CONSTRAINT_H_
Include the generated interface declarations.
Constraint(const llvm::Record *record, Kind kind)
Definition: Constraint.h:36
The OpAsmOpInterface, see OpAsmInterface.td for more details.
Definition: CallGraph.h:221
bool operator!=(const Constraint &that)
Definition: Constraint.h:42
std::vector< std::string > entities
Definition: Constraint.h:95
const llvm::Record * def
Definition: Constraint.h:76
bool operator==(const Constraint &that)
Constraints are pointer-comparable.
Definition: Constraint.h:41
Kind getKind() const
Definition: Constraint.h:72