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https://github.com/c64scene-ar/llvm-6502.git
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83dd2ae095
It had no tests, was unused and was "experimental at best". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193749 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===-- PrologEpilogInserter.h - Prolog/Epilog code insertion -*- 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 pass is responsible for finalizing the functions frame layout, saving
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// callee saved registers, and for emitting prolog & epilog code for the
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// function.
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//
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// This pass must be run after register allocation. After this pass is
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// executed, it is illegal to construct MO_FrameIndex operands.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_PEI_H
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#define LLVM_CODEGEN_PEI_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SparseBitVector.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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namespace llvm {
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class RegScavenger;
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class MachineBasicBlock;
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class PEI : public MachineFunctionPass {
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public:
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static char ID;
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PEI() : MachineFunctionPass(ID) {
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initializePEIPass(*PassRegistry::getPassRegistry());
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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/// runOnMachineFunction - Insert prolog/epilog code and replace abstract
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/// frame indexes with appropriate references.
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///
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bool runOnMachineFunction(MachineFunction &Fn);
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private:
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RegScavenger *RS;
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// MinCSFrameIndex, MaxCSFrameIndex - Keeps the range of callee saved
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// stack frame indexes.
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unsigned MinCSFrameIndex, MaxCSFrameIndex;
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// Entry and return blocks of the current function.
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MachineBasicBlock* EntryBlock;
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SmallVector<MachineBasicBlock*, 4> ReturnBlocks;
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// Flag to control whether to use the register scavenger to resolve
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// frame index materialization registers. Set according to
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// TRI->requiresFrameIndexScavenging() for the curren function.
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bool FrameIndexVirtualScavenging;
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void calculateSets(MachineFunction &Fn);
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void calculateCallsInformation(MachineFunction &Fn);
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void calculateCalleeSavedRegisters(MachineFunction &Fn);
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void insertCSRSpillsAndRestores(MachineFunction &Fn);
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void calculateFrameObjectOffsets(MachineFunction &Fn);
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void replaceFrameIndices(MachineFunction &Fn);
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void replaceFrameIndices(MachineBasicBlock *BB, MachineFunction &Fn,
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int &SPAdj);
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void scavengeFrameVirtualRegs(MachineFunction &Fn);
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void insertPrologEpilogCode(MachineFunction &Fn);
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// Convenience for recognizing return blocks.
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bool isReturnBlock(MachineBasicBlock* MBB);
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};
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} // End llvm namespace
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#endif
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