forked from OSchip/llvm-project
378 lines
15 KiB
C++
378 lines
15 KiB
C++
//===- FunctionImplementation.cpp - Utilities for function-like ops -------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/IR/FunctionImplementation.h"
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#include "mlir/IR/Builders.h"
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#include "mlir/IR/FunctionSupport.h"
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#include "mlir/IR/SymbolTable.h"
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using namespace mlir;
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ParseResult mlir::function_like_impl::parseFunctionArgumentList(
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OpAsmParser &parser, bool allowAttributes, bool allowVariadic,
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SmallVectorImpl<OpAsmParser::OperandType> &argNames,
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SmallVectorImpl<Type> &argTypes, SmallVectorImpl<NamedAttrList> &argAttrs,
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bool &isVariadic) {
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if (parser.parseLParen())
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return failure();
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// The argument list either has to consistently have ssa-id's followed by
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// types, or just be a type list. It isn't ok to sometimes have SSA ID's and
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// sometimes not.
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auto parseArgument = [&]() -> ParseResult {
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llvm::SMLoc loc = parser.getCurrentLocation();
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// Parse argument name if present.
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OpAsmParser::OperandType argument;
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Type argumentType;
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if (succeeded(parser.parseOptionalRegionArgument(argument)) &&
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!argument.name.empty()) {
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// Reject this if the preceding argument was missing a name.
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if (argNames.empty() && !argTypes.empty())
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return parser.emitError(loc, "expected type instead of SSA identifier");
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argNames.push_back(argument);
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if (parser.parseColonType(argumentType))
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return failure();
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} else if (allowVariadic && succeeded(parser.parseOptionalEllipsis())) {
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isVariadic = true;
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return success();
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} else if (!argNames.empty()) {
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// Reject this if the preceding argument had a name.
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return parser.emitError(loc, "expected SSA identifier");
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} else if (parser.parseType(argumentType)) {
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return failure();
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}
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// Add the argument type.
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argTypes.push_back(argumentType);
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// Parse any argument attributes.
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NamedAttrList attrs;
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if (parser.parseOptionalAttrDict(attrs))
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return failure();
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if (!allowAttributes && !attrs.empty())
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return parser.emitError(loc, "expected arguments without attributes");
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argAttrs.push_back(attrs);
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// Parse a location if specified. TODO: Don't drop it on the floor.
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Optional<Location> explicitLoc;
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if (!argument.name.empty() &&
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parser.parseOptionalLocationSpecifier(explicitLoc))
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return failure();
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return success();
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};
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// Parse the function arguments.
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isVariadic = false;
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if (failed(parser.parseOptionalRParen())) {
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do {
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unsigned numTypedArguments = argTypes.size();
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if (parseArgument())
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return failure();
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llvm::SMLoc loc = parser.getCurrentLocation();
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if (argTypes.size() == numTypedArguments &&
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succeeded(parser.parseOptionalComma()))
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return parser.emitError(
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loc, "variadic arguments must be in the end of the argument list");
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} while (succeeded(parser.parseOptionalComma()));
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parser.parseRParen();
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}
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return success();
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}
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/// Parse a function result list.
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///
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/// function-result-list ::= function-result-list-parens
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/// | non-function-type
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/// function-result-list-parens ::= `(` `)`
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/// | `(` function-result-list-no-parens `)`
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/// function-result-list-no-parens ::= function-result (`,` function-result)*
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/// function-result ::= type attribute-dict?
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///
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static ParseResult
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parseFunctionResultList(OpAsmParser &parser, SmallVectorImpl<Type> &resultTypes,
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SmallVectorImpl<NamedAttrList> &resultAttrs) {
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if (failed(parser.parseOptionalLParen())) {
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// We already know that there is no `(`, so parse a type.
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// Because there is no `(`, it cannot be a function type.
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Type ty;
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if (parser.parseType(ty))
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return failure();
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resultTypes.push_back(ty);
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resultAttrs.emplace_back();
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return success();
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}
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// Special case for an empty set of parens.
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if (succeeded(parser.parseOptionalRParen()))
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return success();
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// Parse individual function results.
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do {
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resultTypes.emplace_back();
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resultAttrs.emplace_back();
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if (parser.parseType(resultTypes.back()) ||
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parser.parseOptionalAttrDict(resultAttrs.back())) {
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return failure();
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}
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} while (succeeded(parser.parseOptionalComma()));
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return parser.parseRParen();
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}
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/// Parses a function signature using `parser`. The `allowVariadic` argument
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/// indicates whether functions with variadic arguments are supported. The
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/// trailing arguments are populated by this function with names, types and
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/// attributes of the arguments and those of the results.
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ParseResult mlir::function_like_impl::parseFunctionSignature(
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OpAsmParser &parser, bool allowVariadic,
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SmallVectorImpl<OpAsmParser::OperandType> &argNames,
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SmallVectorImpl<Type> &argTypes, SmallVectorImpl<NamedAttrList> &argAttrs,
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bool &isVariadic, SmallVectorImpl<Type> &resultTypes,
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SmallVectorImpl<NamedAttrList> &resultAttrs) {
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bool allowArgAttrs = true;
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if (parseFunctionArgumentList(parser, allowArgAttrs, allowVariadic, argNames,
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argTypes, argAttrs, isVariadic))
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return failure();
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if (succeeded(parser.parseOptionalArrow()))
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return parseFunctionResultList(parser, resultTypes, resultAttrs);
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return success();
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}
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/// Implementation of `addArgAndResultAttrs` that is attribute list type
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/// agnostic.
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template <typename AttrListT, typename AttrArrayBuildFnT>
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static void addArgAndResultAttrsImpl(Builder &builder, OperationState &result,
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ArrayRef<AttrListT> argAttrs,
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ArrayRef<AttrListT> resultAttrs,
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AttrArrayBuildFnT &&buildAttrArrayFn) {
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auto nonEmptyAttrsFn = [](const AttrListT &attrs) { return !attrs.empty(); };
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// Add the attributes to the function arguments.
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if (!argAttrs.empty() && llvm::any_of(argAttrs, nonEmptyAttrsFn)) {
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ArrayAttr attrDicts = builder.getArrayAttr(buildAttrArrayFn(argAttrs));
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result.addAttribute(function_like_impl::getArgDictAttrName(), attrDicts);
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}
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// Add the attributes to the function results.
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if (!resultAttrs.empty() && llvm::any_of(resultAttrs, nonEmptyAttrsFn)) {
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ArrayAttr attrDicts = builder.getArrayAttr(buildAttrArrayFn(resultAttrs));
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result.addAttribute(function_like_impl::getResultDictAttrName(), attrDicts);
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}
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}
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void mlir::function_like_impl::addArgAndResultAttrs(
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Builder &builder, OperationState &result, ArrayRef<DictionaryAttr> argAttrs,
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ArrayRef<DictionaryAttr> resultAttrs) {
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auto buildFn = [](ArrayRef<DictionaryAttr> attrs) {
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return ArrayRef<Attribute>(attrs.data(), attrs.size());
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};
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addArgAndResultAttrsImpl(builder, result, argAttrs, resultAttrs, buildFn);
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}
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void mlir::function_like_impl::addArgAndResultAttrs(
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Builder &builder, OperationState &result, ArrayRef<NamedAttrList> argAttrs,
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ArrayRef<NamedAttrList> resultAttrs) {
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MLIRContext *context = builder.getContext();
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auto buildFn = [=](ArrayRef<NamedAttrList> attrs) {
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return llvm::to_vector<8>(
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llvm::map_range(attrs, [=](const NamedAttrList &attrList) -> Attribute {
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return attrList.getDictionary(context);
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}));
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};
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addArgAndResultAttrsImpl(builder, result, argAttrs, resultAttrs, buildFn);
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}
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/// Parser implementation for function-like operations. Uses `funcTypeBuilder`
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/// to construct the custom function type given lists of input and output types.
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ParseResult mlir::function_like_impl::parseFunctionLikeOp(
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OpAsmParser &parser, OperationState &result, bool allowVariadic,
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FuncTypeBuilder funcTypeBuilder) {
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SmallVector<OpAsmParser::OperandType, 4> entryArgs;
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SmallVector<NamedAttrList, 4> argAttrs;
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SmallVector<NamedAttrList, 4> resultAttrs;
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SmallVector<Type, 4> argTypes;
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SmallVector<Type, 4> resultTypes;
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auto &builder = parser.getBuilder();
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// Parse visibility.
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impl::parseOptionalVisibilityKeyword(parser, result.attributes);
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// Parse the name as a symbol.
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StringAttr nameAttr;
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if (parser.parseSymbolName(nameAttr, SymbolTable::getSymbolAttrName(),
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result.attributes))
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return failure();
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// Parse the function signature.
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llvm::SMLoc signatureLocation = parser.getCurrentLocation();
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bool isVariadic = false;
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if (parseFunctionSignature(parser, allowVariadic, entryArgs, argTypes,
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argAttrs, isVariadic, resultTypes, resultAttrs))
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return failure();
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std::string errorMessage;
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Type type = funcTypeBuilder(builder, argTypes, resultTypes,
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VariadicFlag(isVariadic), errorMessage);
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if (!type) {
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return parser.emitError(signatureLocation)
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<< "failed to construct function type"
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<< (errorMessage.empty() ? "" : ": ") << errorMessage;
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}
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result.addAttribute(getTypeAttrName(), TypeAttr::get(type));
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// If function attributes are present, parse them.
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NamedAttrList parsedAttributes;
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llvm::SMLoc attributeDictLocation = parser.getCurrentLocation();
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if (parser.parseOptionalAttrDictWithKeyword(parsedAttributes))
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return failure();
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// Disallow attributes that are inferred from elsewhere in the attribute
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// dictionary.
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for (StringRef disallowed :
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{SymbolTable::getVisibilityAttrName(), SymbolTable::getSymbolAttrName(),
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getTypeAttrName()}) {
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if (parsedAttributes.get(disallowed))
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return parser.emitError(attributeDictLocation, "'")
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<< disallowed
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<< "' is an inferred attribute and should not be specified in the "
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"explicit attribute dictionary";
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}
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result.attributes.append(parsedAttributes);
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// Add the attributes to the function arguments.
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assert(argAttrs.size() == argTypes.size());
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assert(resultAttrs.size() == resultTypes.size());
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addArgAndResultAttrs(builder, result, argAttrs, resultAttrs);
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// Parse the optional function body. The printer will not print the body if
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// its empty, so disallow parsing of empty body in the parser.
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auto *body = result.addRegion();
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llvm::SMLoc loc = parser.getCurrentLocation();
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OptionalParseResult parseResult = parser.parseOptionalRegion(
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*body, entryArgs, entryArgs.empty() ? ArrayRef<Type>() : argTypes,
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/*enableNameShadowing=*/false);
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if (parseResult.hasValue()) {
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if (failed(*parseResult))
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return failure();
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// Function body was parsed, make sure its not empty.
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if (body->empty())
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return parser.emitError(loc, "expected non-empty function body");
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}
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return success();
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}
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/// Print a function result list. The provided `attrs` must either be null, or
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/// contain a set of DictionaryAttrs of the same arity as `types`.
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static void printFunctionResultList(OpAsmPrinter &p, ArrayRef<Type> types,
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ArrayAttr attrs) {
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assert(!types.empty() && "Should not be called for empty result list.");
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assert((!attrs || attrs.size() == types.size()) &&
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"Invalid number of attributes.");
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auto &os = p.getStream();
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bool needsParens = types.size() > 1 || types[0].isa<FunctionType>() ||
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(attrs && !attrs[0].cast<DictionaryAttr>().empty());
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if (needsParens)
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os << '(';
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llvm::interleaveComma(llvm::seq<size_t>(0, types.size()), os, [&](size_t i) {
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p.printType(types[i]);
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if (attrs)
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p.printOptionalAttrDict(attrs[i].cast<DictionaryAttr>().getValue());
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});
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if (needsParens)
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os << ')';
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}
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/// Print the signature of the function-like operation `op`. Assumes `op` has
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/// the FunctionLike trait and passed the verification.
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void mlir::function_like_impl::printFunctionSignature(
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OpAsmPrinter &p, Operation *op, ArrayRef<Type> argTypes, bool isVariadic,
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ArrayRef<Type> resultTypes) {
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Region &body = op->getRegion(0);
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bool isExternal = body.empty();
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p << '(';
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ArrayAttr argAttrs = op->getAttrOfType<ArrayAttr>(getArgDictAttrName());
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for (unsigned i = 0, e = argTypes.size(); i < e; ++i) {
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if (i > 0)
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p << ", ";
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if (!isExternal) {
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ArrayRef<NamedAttribute> attrs;
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if (argAttrs)
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attrs = argAttrs[i].cast<DictionaryAttr>().getValue();
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p.printRegionArgument(body.getArgument(i), attrs);
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} else {
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p.printType(argTypes[i]);
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if (argAttrs)
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p.printOptionalAttrDict(argAttrs[i].cast<DictionaryAttr>().getValue());
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}
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}
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if (isVariadic) {
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if (!argTypes.empty())
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p << ", ";
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p << "...";
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}
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p << ')';
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if (!resultTypes.empty()) {
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p.getStream() << " -> ";
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auto resultAttrs = op->getAttrOfType<ArrayAttr>(getResultDictAttrName());
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printFunctionResultList(p, resultTypes, resultAttrs);
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}
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}
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/// Prints the list of function prefixed with the "attributes" keyword. The
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/// attributes with names listed in "elided" as well as those used by the
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/// function-like operation internally are not printed. Nothing is printed
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/// if all attributes are elided. Assumes `op` has the `FunctionLike` trait and
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/// passed the verification.
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void mlir::function_like_impl::printFunctionAttributes(
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OpAsmPrinter &p, Operation *op, unsigned numInputs, unsigned numResults,
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ArrayRef<StringRef> elided) {
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// Print out function attributes, if present.
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SmallVector<StringRef, 2> ignoredAttrs = {
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::mlir::SymbolTable::getSymbolAttrName(), getTypeAttrName(),
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getArgDictAttrName(), getResultDictAttrName()};
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ignoredAttrs.append(elided.begin(), elided.end());
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p.printOptionalAttrDictWithKeyword(op->getAttrs(), ignoredAttrs);
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}
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/// Printer implementation for function-like operations. Accepts lists of
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/// argument and result types to use while printing.
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void mlir::function_like_impl::printFunctionLikeOp(OpAsmPrinter &p,
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Operation *op,
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ArrayRef<Type> argTypes,
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bool isVariadic,
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ArrayRef<Type> resultTypes) {
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// Print the operation and the function name.
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auto funcName =
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op->getAttrOfType<StringAttr>(SymbolTable::getSymbolAttrName())
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.getValue();
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p << ' ';
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StringRef visibilityAttrName = SymbolTable::getVisibilityAttrName();
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if (auto visibility = op->getAttrOfType<StringAttr>(visibilityAttrName))
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p << visibility.getValue() << ' ';
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p.printSymbolName(funcName);
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printFunctionSignature(p, op, argTypes, isVariadic, resultTypes);
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printFunctionAttributes(p, op, argTypes.size(), resultTypes.size(),
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{visibilityAttrName});
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// Print the body if this is not an external function.
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Region &body = op->getRegion(0);
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if (!body.empty())
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p.printRegion(body, /*printEntryBlockArgs=*/false,
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/*printBlockTerminators=*/true);
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}
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