1 //===- Constraint.cpp - Constraint class ----------------------------------===//
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 #include "mlir/TableGen/Constraint.h"
14 #include "llvm/TableGen/Record.h"
15 
16 using namespace mlir::tblgen;
17 
18 Constraint::Constraint(const llvm::Record *record)
19     : def(record), kind(CK_Uncategorized) {
20   // Look through OpVariable's to their constraint.
21   if (def->isSubClassOf("OpVariable"))
22     def = def->getValueAsDef("constraint");
23   if (def->isSubClassOf("TypeConstraint")) {
24     kind = CK_Type;
25   } else if (def->isSubClassOf("AttrConstraint")) {
26     kind = CK_Attr;
27   } else if (def->isSubClassOf("RegionConstraint")) {
28     kind = CK_Region;
29   } else if (def->isSubClassOf("SuccessorConstraint")) {
30     kind = CK_Successor;
31   } else {
32     assert(def->isSubClassOf("Constraint"));
33   }
34 }
35 
36 Constraint::Constraint(Kind kind, const llvm::Record *record)
37     : def(record), kind(kind) {
38   // Look through OpVariable's to their constraint.
39   if (def->isSubClassOf("OpVariable"))
40     def = def->getValueAsDef("constraint");
41 }
42 
43 Pred Constraint::getPredicate() const {
44   auto *val = def->getValue("predicate");
45 
46   // If no predicate is specified, then return the null predicate (which
47   // corresponds to true).
48   if (!val)
49     return Pred();
50 
51   const auto *pred = dyn_cast<llvm::DefInit>(val->getValue());
52   return Pred(pred);
53 }
54 
55 std::string Constraint::getConditionTemplate() const {
56   return getPredicate().getCondition();
57 }
58 
59 llvm::StringRef Constraint::getDescription() const {
60   auto doc = def->getValueAsString("description");
61   if (doc.empty())
62     return def->getName();
63   return doc;
64 }
65 
66 AppliedConstraint::AppliedConstraint(Constraint &&constraint,
67                                      llvm::StringRef self,
68                                      std::vector<std::string> &&entities)
69     : constraint(constraint), self(std::string(self)),
70       entities(std::move(entities)) {}
71