81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
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//===-- MachineFunctionPass.h - Pass for MachineFunctions --------*-C++ -*-===//
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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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//
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// This file defines the MachineFunctionPass class. MachineFunctionPass's are
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// just FunctionPass's, except they operate on machine code as part of a code
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// generator. Because they operate on machine code, not the LLVM
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// representation, MachineFunctionPass's are not allowed to modify the LLVM
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// representation. Due to this limitation, the MachineFunctionPass class takes
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// care of declaring that no LLVM passes are invalidated.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINEFUNCTIONPASS_H
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#define LLVM_CODEGEN_MACHINEFUNCTIONPASS_H
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Pass.h"
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namespace llvm {
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/// MachineFunctionPass - This class adapts the FunctionPass interface to
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/// allow convenient creation of passes that operate on the MachineFunction
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/// representation. Instead of overriding runOnFunction, subclasses
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/// override runOnMachineFunction.
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class MachineFunctionPass : public FunctionPass {
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public:
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bool doInitialization(Module&) override {
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// Cache the properties info at module-init time so we don't have to
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// construct them for every function.
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RequiredProperties = getRequiredProperties();
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SetProperties = getSetProperties();
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ClearedProperties = getClearedProperties();
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return false;
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}
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protected:
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explicit MachineFunctionPass(char &ID) : FunctionPass(ID) {}
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/// runOnMachineFunction - This method must be overloaded to perform the
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/// desired machine code transformation or analysis.
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///
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virtual bool runOnMachineFunction(MachineFunction &MF) = 0;
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/// getAnalysisUsage - Subclasses that override getAnalysisUsage
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/// must call this.
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///
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/// For MachineFunctionPasses, calling AU.preservesCFG() indicates that
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/// the pass does not modify the MachineBasicBlock CFG.
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///
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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virtual MachineFunctionProperties getRequiredProperties() const {
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return MachineFunctionProperties();
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}
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virtual MachineFunctionProperties getSetProperties() const {
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return MachineFunctionProperties();
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}
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virtual MachineFunctionProperties getClearedProperties() const {
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return MachineFunctionProperties();
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}
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private:
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MachineFunctionProperties RequiredProperties;
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MachineFunctionProperties SetProperties;
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MachineFunctionProperties ClearedProperties;
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/// createPrinterPass - Get a machine function printer pass.
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Pass *createPrinterPass(raw_ostream &O,
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const std::string &Banner) const override;
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bool runOnFunction(Function &F) override;
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};
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} // End llvm namespace
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#endif
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