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MachineFunctionProperties represents a set of properties that a MachineFunction can have at particular points in time. Existing examples of this idea are MachineRegisterInfo::isSSA() and MachineRegisterInfo::tracksLiveness() which will eventually be switched to use this mechanism. This change introduces the AllVRegsAllocated property; i.e. the property that all virtual registers have been allocated and there are no VReg operands left. With this mechanism, passes can declare that they require a particular property to be set, or that they set or clear properties by implementing e.g. MachineFunctionPass::getRequiredProperties(). The MachineFunctionPass base class verifies that the requirements are met, and handles the setting and clearing based on the delcarations. Passes can also directly query and update the current properties of the MF if they want to have conditional behavior. This change annotates the target-independent post-regalloc passes; future changes will also annotate target-specific ones. Reviewers: qcolombet, hfinkel Differential Revision: http://reviews.llvm.org/D18421 llvm-svn: 264593
82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
//===-- MachineFunctionPass.h - Pass for MachineFunctions --------*-C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/Pass.h"
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#include "llvm/CodeGen/MachineFunction.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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