1 //===- Interfaces.cpp - C Interface for MLIR Interfaces -------------------===//
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 #include "mlir-c/Interfaces.h"
10 
11 #include "mlir/CAPI/IR.h"
12 #include "mlir/CAPI/Support.h"
13 #include "mlir/CAPI/Wrap.h"
14 #include "mlir/Interfaces/InferTypeOpInterface.h"
15 #include "llvm/ADT/ScopeExit.h"
16 
17 using namespace mlir;
18 
19 bool mlirOperationImplementsInterface(MlirOperation operation,
20                                       MlirTypeID interfaceTypeID) {
21   Optional<RegisteredOperationName> info =
22       unwrap(operation)->getRegisteredInfo();
23   return info && info->hasInterface(unwrap(interfaceTypeID));
24 }
25 
26 bool mlirOperationImplementsInterfaceStatic(MlirStringRef operationName,
27                                             MlirContext context,
28                                             MlirTypeID interfaceTypeID) {
29   Optional<RegisteredOperationName> info = RegisteredOperationName::lookup(
30       StringRef(operationName.data, operationName.length), unwrap(context));
31   return info && info->hasInterface(unwrap(interfaceTypeID));
32 }
33 
34 MlirTypeID mlirInferTypeOpInterfaceTypeID() {
35   return wrap(InferTypeOpInterface::getInterfaceID());
36 }
37 
38 MlirLogicalResult mlirInferTypeOpInterfaceInferReturnTypes(
39     MlirStringRef opName, MlirContext context, MlirLocation location,
40     intptr_t nOperands, MlirValue *operands, MlirAttribute attributes,
41     intptr_t nRegions, MlirRegion *regions, MlirTypesCallback callback,
42     void *userData) {
43   StringRef name(opName.data, opName.length);
44   Optional<RegisteredOperationName> info =
45       RegisteredOperationName::lookup(name, unwrap(context));
46   if (!info)
47     return mlirLogicalResultFailure();
48 
49   llvm::Optional<Location> maybeLocation = llvm::None;
50   if (!mlirLocationIsNull(location))
51     maybeLocation = unwrap(location);
52   SmallVector<Value> unwrappedOperands;
53   (void)unwrapList(nOperands, operands, unwrappedOperands);
54   DictionaryAttr attributeDict;
55   if (!mlirAttributeIsNull(attributes))
56     attributeDict = unwrap(attributes).cast<DictionaryAttr>();
57 
58   // Create a vector of unique pointers to regions and make sure they are not
59   // deleted when exiting the scope. This is a hack caused by C++ API expecting
60   // an list of unique pointers to regions (without ownership transfer
61   // semantics) and C API making ownership transfer explicit.
62   SmallVector<std::unique_ptr<Region>> unwrappedRegions;
63   unwrappedRegions.reserve(nRegions);
64   for (intptr_t i = 0; i < nRegions; ++i)
65     unwrappedRegions.emplace_back(unwrap(*(regions + i)));
66   auto cleaner = llvm::make_scope_exit([&]() {
67     for (auto &region : unwrappedRegions)
68       region.release();
69   });
70 
71   SmallVector<Type> inferredTypes;
72   if (failed(info->getInterface<InferTypeOpInterface>()->inferReturnTypes(
73           unwrap(context), maybeLocation, unwrappedOperands, attributeDict,
74           unwrappedRegions, inferredTypes)))
75     return mlirLogicalResultFailure();
76 
77   SmallVector<MlirType> wrappedInferredTypes;
78   wrappedInferredTypes.reserve(inferredTypes.size());
79   for (Type t : inferredTypes)
80     wrappedInferredTypes.push_back(wrap(t));
81   callback(wrappedInferredTypes.size(), wrappedInferredTypes.data(), userData);
82   return mlirLogicalResultSuccess();
83 }
84