1 //===- FunctionImplementation.h - Function-like Op utilities ----*- 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 // This file provides utility functions for implementing function-like
10 // operations, in particular, parsing, printing and verification components
11 // common to function-like operations.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef MLIR_IR_FUNCTIONIMPLEMENTATION_H_
16 #define MLIR_IR_FUNCTIONIMPLEMENTATION_H_
17 
18 #include "mlir/IR/FunctionInterfaces.h"
19 #include "mlir/IR/OpImplementation.h"
20 
21 namespace mlir {
22 
23 namespace function_interface_impl {
24 
25 /// A named class for passing around the variadic flag.
26 class VariadicFlag {
27 public:
VariadicFlag(bool variadic)28   explicit VariadicFlag(bool variadic) : variadic(variadic) {}
isVariadic()29   bool isVariadic() const { return variadic; }
30 
31 private:
32   /// Underlying storage.
33   bool variadic;
34 };
35 
36 /// Adds argument and result attributes, provided as `argAttrs` and
37 /// `resultAttrs` arguments, to the list of operation attributes in `result`.
38 /// Internally, argument and result attributes are stored as dict attributes
39 /// with special names given by getResultAttrName, getArgumentAttrName.
40 void addArgAndResultAttrs(Builder &builder, OperationState &result,
41                           ArrayRef<DictionaryAttr> argAttrs,
42                           ArrayRef<DictionaryAttr> resultAttrs);
43 void addArgAndResultAttrs(Builder &builder, OperationState &result,
44                           ArrayRef<OpAsmParser::Argument> argAttrs,
45                           ArrayRef<DictionaryAttr> resultAttrs);
46 
47 /// Callback type for `parseFunctionOp`, the callback should produce the
48 /// type that will be associated with a function-like operation from lists of
49 /// function arguments and results, VariadicFlag indicates whether the function
50 /// should have variadic arguments; in case of error, it may populate the last
51 /// argument with a message.
52 using FuncTypeBuilder = function_ref<Type(
53     Builder &, ArrayRef<Type>, ArrayRef<Type>, VariadicFlag, std::string &)>;
54 
55 /// Parses a function signature using `parser`. The `allowVariadic` argument
56 /// indicates whether functions with variadic arguments are supported. The
57 /// trailing arguments are populated by this function with names, types,
58 /// attributes and locations of the arguments and those of the results.
59 ParseResult
60 parseFunctionSignature(OpAsmParser &parser, bool allowVariadic,
61                        SmallVectorImpl<OpAsmParser::Argument> &arguments,
62                        bool &isVariadic, SmallVectorImpl<Type> &resultTypes,
63                        SmallVectorImpl<DictionaryAttr> &resultAttrs);
64 
65 /// Get a function type corresponding to an array of arguments (which have
66 /// types) and a set of result types.
67 Type getFunctionType(Builder &builder, ArrayRef<OpAsmParser::Argument> argAttrs,
68                      ArrayRef<Type> resultTypes);
69 
70 /// Parser implementation for function-like operations.  Uses
71 /// `funcTypeBuilder` to construct the custom function type given lists of
72 /// input and output types.  If `allowVariadic` is set, the parser will accept
73 /// trailing ellipsis in the function signature and indicate to the builder
74 /// whether the function is variadic.  If the builder returns a null type,
75 /// `result` will not contain the `type` attribute.  The caller can then add a
76 /// type, report the error or delegate the reporting to the op's verifier.
77 ParseResult parseFunctionOp(OpAsmParser &parser, OperationState &result,
78                             bool allowVariadic,
79                             FuncTypeBuilder funcTypeBuilder);
80 
81 /// Printer implementation for function-like operations.
82 void printFunctionOp(OpAsmPrinter &p, FunctionOpInterface op, bool isVariadic);
83 
84 /// Prints the signature of the function-like operation `op`. Assumes `op` has
85 /// is a FunctionOpInterface and has passed verification.
86 void printFunctionSignature(OpAsmPrinter &p, Operation *op,
87                             ArrayRef<Type> argTypes, bool isVariadic,
88                             ArrayRef<Type> resultTypes);
89 
90 /// Prints the list of function prefixed with the "attributes" keyword. The
91 /// attributes with names listed in "elided" as well as those used by the
92 /// function-like operation internally are not printed. Nothing is printed
93 /// if all attributes are elided. Assumes `op` is a FunctionOpInterface and
94 /// has passed verification.
95 void printFunctionAttributes(OpAsmPrinter &p, Operation *op, unsigned numInputs,
96                              unsigned numResults,
97                              ArrayRef<StringRef> elided = {});
98 
99 } // namespace function_interface_impl
100 
101 } // namespace mlir
102 
103 #endif // MLIR_IR_FUNCTIONIMPLEMENTATION_H_
104