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//===- ConvertToCFG.cpp - ML function to CFG function converstion ---------===//
//
// 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.
// =============================================================================
//
// This file implements APIs to convert ML functions into CFG functions.
//
//===----------------------------------------------------------------------===//
#include "mlir/IR/Builders.h"
#include "mlir/IR/CFGFunction.h"
#include "mlir/IR/MLFunction.h"
#include "mlir/IR/Module.h"
#include "mlir/Pass.h"
#include "mlir/Transforms/Passes.h"
#include "llvm/ADT/DenseSet.h"
using namespace mlir;
//===----------------------------------------------------------------------===//
// ML function converter
//===----------------------------------------------------------------------===//
namespace {
// Generates CFG function equivalent to the given ML function.
class FunctionConverter {
public:
FunctionConverter(CFGFunction *cfgFunc)
: cfgFunc(cfgFunc), builder(cfgFunc) {}
CFGFunction *convert(const MLFunction *mlFunc);
private:
CFGFunction *cfgFunc;
CFGFuncBuilder builder;
};
} // end anonymous namespace
CFGFunction *FunctionConverter::convert(const MLFunction *mlFunc) {
builder.createBlock();
// Creates return instruction with no operands.
// TODO: convert return operands.
builder.createReturn(mlFunc->getReturnStmt()->getLoc(), {});
// TODO: convert ML function body.
return cfgFunc;
}
//===----------------------------------------------------------------------===//
// Module converter
//===----------------------------------------------------------------------===//
namespace {
// ModuleConverter class does CFG conversion for the whole module.
class ModuleConverter : public ModulePass {
public:
explicit ModuleConverter() {}
PassResult runOnModule(Module *m) override;
private:
// Generates CFG functions for all ML functions in the module.
void convertMLFunctions();
// Generates CFG function for the given ML function.
CFGFunction *convert(const MLFunction *mlFunc);
// Replaces all ML function references in the module
// with references to the generated CFG functions.
void replaceReferences();
// Replaces function references in the given function.
void replaceReferences(CFGFunction *cfgFunc);
void replaceReferences(MLFunction *mlFunc);
// Removes all ML funtions from the module.
void removeMLFunctions();
// Map from ML functions to generated CFG functions.
llvm::DenseMap<const MLFunction *, CFGFunction *> generatedFuncs;
Module *module = nullptr;
};
} // end anonymous namespace
// Iterates over all functions in the module generating CFG functions
// equivalent to ML functions and replacing references to ML functions
// with references to the generated ML functions.
PassResult ModuleConverter::runOnModule(Module *m) {
module = m;
convertMLFunctions();
replaceReferences();
return success();
}
void ModuleConverter::convertMLFunctions() {
for (Function &fn : *module) {
if (auto *mlFunc = dyn_cast<MLFunction>(&fn))
generatedFuncs[mlFunc] = convert(mlFunc);
}
}
// Creates CFG function equivalent to the given ML function.
CFGFunction *ModuleConverter::convert(const MLFunction *mlFunc) {
// TODO: ensure that CFG function name is unique.
auto *cfgFunc =
new CFGFunction(mlFunc->getLoc(), mlFunc->getName().str() + "_cfg",
mlFunc->getType(), mlFunc->getAttrs());
module->getFunctions().push_back(cfgFunc);
// Generates the body of the CFG function.
return FunctionConverter(cfgFunc).convert(mlFunc);
}
void ModuleConverter::replaceReferences() {
for (Function &fn : *module) {
switch (fn.getKind()) {
case Function::Kind::CFGFunc:
replaceReferences(&cast<CFGFunction>(fn));
break;
case Function::Kind::MLFunc:
replaceReferences(&cast<MLFunction>(fn));
break;
case Function::Kind::ExtFunc:
// nothing to do for external functions
break;
}
}
}
void ModuleConverter::replaceReferences(CFGFunction *func) {
// TODO: NOP for now since function attributes are not yet implemented.
}
void ModuleConverter::replaceReferences(MLFunction *func) {
// TODO: NOP for now since function attributes are not yet implemented.
}
// Removes all ML functions from the module.
void ModuleConverter::removeMLFunctions() {
// Delete ML functions from the module.
for (auto it = module->begin(), e = module->end(); it != e;) {
// Manipulate iterator carefully to avoid deleting a function we're pointing
// at.
Function &fn = *it++;
if (auto mlFunc = dyn_cast<MLFunction>(&fn))
mlFunc->eraseFromModule();
}
}
//===----------------------------------------------------------------------===//
// Entry point method
//===----------------------------------------------------------------------===//
/// Replaces all ML functions in the module with equivalent CFG functions.
/// Function references are appropriately patched to refer to the newly
/// generated CFG functions.
ModulePass *mlir::createConvertToCFGPass() { return new ModuleConverter(); }
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