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//===- FunctionSupport.cpp - Utility types for function-like ops ----------===//
//
// Copyright 2019 The MLIR Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// =============================================================================
#include "mlir/IR/FunctionSupport.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/OpImplementation.h"
using namespace mlir;
static ParseResult
parseArgumentList(OpAsmParser &parser, bool allowVariadic,
SmallVectorImpl<Type> &argTypes,
SmallVectorImpl<OpAsmParser::OperandType> &argNames,
SmallVectorImpl<SmallVector<NamedAttribute, 2>> &argAttrs,
bool &isVariadic) {
if (parser.parseLParen())
return failure();
// The argument list either has to consistently have ssa-id's followed by
// types, or just be a type list. It isn't ok to sometimes have SSA ID's and
// sometimes not.
auto parseArgument = [&]() -> ParseResult {
llvm::SMLoc loc = parser.getCurrentLocation();
// Parse argument name if present.
OpAsmParser::OperandType argument;
Type argumentType;
if (succeeded(parser.parseOptionalRegionArgument(argument)) &&
!argument.name.empty()) {
// Reject this if the preceding argument was missing a name.
if (argNames.empty() && !argTypes.empty())
return parser.emitError(loc, "expected type instead of SSA identifier");
argNames.push_back(argument);
if (parser.parseColonType(argumentType))
return failure();
} else if (allowVariadic && succeeded(parser.parseOptionalEllipsis())) {
isVariadic = true;
return success();
} else if (!argNames.empty()) {
// Reject this if the preceding argument had a name.
return parser.emitError(loc, "expected SSA identifier");
} else if (parser.parseType(argumentType)) {
return failure();
}
// Add the argument type.
argTypes.push_back(argumentType);
// Parse any argument attributes.
SmallVector<NamedAttribute, 2> attrs;
if (parser.parseOptionalAttributeDict(attrs))
return failure();
argAttrs.push_back(attrs);
return success();
};
// Parse the function arguments.
if (parser.parseOptionalRParen()) {
do {
unsigned numTypedArguments = argTypes.size();
if (parseArgument())
return failure();
llvm::SMLoc loc = parser.getCurrentLocation();
if (argTypes.size() == numTypedArguments &&
succeeded(parser.parseOptionalComma()))
return parser.emitError(
loc, "variadic arguments must be in the end of the argument list");
} while (succeeded(parser.parseOptionalComma()));
parser.parseRParen();
}
return success();
}
/// Parse a function signature, starting with a name and including the
/// parameter list.
static ParseResult parseFunctionSignature(
OpAsmParser &parser, bool allowVariadic,
SmallVectorImpl<OpAsmParser::OperandType> &argNames,
SmallVectorImpl<Type> &argTypes,
SmallVectorImpl<SmallVector<NamedAttribute, 2>> &argAttrs, bool &isVariadic,
SmallVectorImpl<Type> &results) {
if (parseArgumentList(parser, allowVariadic, argTypes, argNames, argAttrs,
isVariadic))
return failure();
// Parse the return types if present.
return parser.parseOptionalArrowTypeList(results);
}
/// Parser implementation for function-like operations. Uses `funcTypeBuilder`
/// to construct the custom function type given lists of input and output types.
ParseResult
mlir::impl::parseFunctionLikeOp(OpAsmParser &parser, OperationState &result,
bool allowVariadic,
mlir::impl::FuncTypeBuilder funcTypeBuilder) {
SmallVector<OpAsmParser::OperandType, 4> entryArgs;
SmallVector<SmallVector<NamedAttribute, 2>, 4> argAttrs;
SmallVector<Type, 4> argTypes;
SmallVector<Type, 4> results;
auto &builder = parser.getBuilder();
// Parse the name as a symbol reference attribute.
SymbolRefAttr nameAttr;
if (parser.parseAttribute(nameAttr, ::mlir::SymbolTable::getSymbolAttrName(),
result.attributes))
return failure();
// Convert the parsed function attr into a string attr.
result.attributes.back().second = builder.getStringAttr(nameAttr.getValue());
// Parse the function signature.
auto signatureLocation = parser.getCurrentLocation();
bool isVariadic = false;
if (parseFunctionSignature(parser, allowVariadic, entryArgs, argTypes,
argAttrs, isVariadic, results))
return failure();
std::string errorMessage;
if (auto type = funcTypeBuilder(builder, argTypes, results,
impl::VariadicFlag(isVariadic), errorMessage))
result.addAttribute(getTypeAttrName(), builder.getTypeAttr(type));
else
return parser.emitError(signatureLocation)
<< "failed to construct function type"
<< (errorMessage.empty() ? "" : ": ") << errorMessage;
// If function attributes are present, parse them.
if (succeeded(parser.parseOptionalKeyword("attributes")))
if (parser.parseOptionalAttributeDict(result.attributes))
return failure();
// Add the attributes to the function arguments.
SmallString<8> argAttrName;
for (unsigned i = 0, e = argTypes.size(); i != e; ++i)
if (!argAttrs[i].empty())
result.addAttribute(getArgAttrName(i, argAttrName),
builder.getDictionaryAttr(argAttrs[i]));
// Parse the optional function body.
auto *body = result.addRegion();
if (parser.parseOptionalRegion(*body, entryArgs,
entryArgs.empty() ? llvm::ArrayRef<Type>()
: argTypes))
return failure();
return success();
}
/// Print the signature of the function-like operation `op`. Assumes `op` has
/// the FunctionLike trait and passed the verification.
static void printSignature(OpAsmPrinter &p, Operation *op,
ArrayRef<Type> argTypes, bool isVariadic,
ArrayRef<Type> results) {
Region &body = op->getRegion(0);
bool isExternal = body.empty();
p << '(';
for (unsigned i = 0, e = argTypes.size(); i < e; ++i) {
if (i > 0)
p << ", ";
if (!isExternal) {
p.printOperand(body.front().getArgument(i));
p << ": ";
}
p.printType(argTypes[i]);
p.printOptionalAttrDict(::mlir::impl::getArgAttrs(op, i));
}
if (isVariadic) {
if (!argTypes.empty())
p << ", ";
p << "...";
}
p << ')';
p.printOptionalArrowTypeList(results);
}
/// Printer implementation for function-like operations. Accepts lists of
/// argument and result types to use while printing.
void mlir::impl::printFunctionLikeOp(OpAsmPrinter &p, Operation *op,
ArrayRef<Type> argTypes, bool isVariadic,
ArrayRef<Type> results) {
// Print the operation and the function name.
auto funcName =
op->getAttrOfType<StringAttr>(::mlir::SymbolTable::getSymbolAttrName())
.getValue();
p << op->getName() << ' ';
p.printSymbolName(funcName);
// Print the signature.
printSignature(p, op, argTypes, isVariadic, results);
// Print out function attributes, if present.
SmallVector<StringRef, 2> ignoredAttrs = {
::mlir::SymbolTable::getSymbolAttrName(), getTypeAttrName()};
// Ignore any argument attributes.
std::vector<SmallString<8>> argAttrStorage;
SmallString<8> argAttrName;
for (unsigned i = 0, e = argTypes.size(); i != e; ++i)
if (op->getAttr(getArgAttrName(i, argAttrName)))
argAttrStorage.emplace_back(argAttrName);
ignoredAttrs.append(argAttrStorage.begin(), argAttrStorage.end());
auto attrs = op->getAttrs();
if (attrs.size() > ignoredAttrs.size()) {
p << "\n attributes ";
p.printOptionalAttrDict(attrs, ignoredAttrs);
}
// Print the body if this is not an external function.
Region &body = op->getRegion(0);
if (!body.empty())
p.printRegion(body, /*printEntryBlockArgs=*/false,
/*printBlockTerminators=*/true);
}
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