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https://github.com/c64scene-ar/llvm-6502.git
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b548b6bfc3
As of r211495, the only remaining users of getMinCallFrameSize are in core ABI code (LowerFormalParameter / LowerCall). This is actually a good thing, since the details of the parameter save area are ABI specific. With the new ELFv2 ABI in particular, the rules defining the size of the save area will become significantly more complex, so it wouldn't make sense to implement those outside ABI code that has all required information. In preparation, this patch eliminates the getMinCallFrameSize (and associated getMinCallArgumentsSize) routines, and inlines them into all callers. Note that since nearly all call arguments are constant, this allows simplifying the inlined copies to a single line everywhere. No change in generate code expected. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211497 91177308-0d34-0410-b5e6-96231b3b80d8
124 lines
4.4 KiB
C++
124 lines
4.4 KiB
C++
//===-- PPCFrameLowering.h - Define frame lowering for PowerPC --*- 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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//
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//===----------------------------------------------------------------------===//
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#ifndef POWERPC_FRAMEINFO_H
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#define POWERPC_FRAMEINFO_H
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#include "PPC.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class PPCSubtarget;
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class PPCFrameLowering: public TargetFrameLowering {
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const PPCSubtarget &Subtarget;
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public:
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PPCFrameLowering(const PPCSubtarget &STI);
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unsigned determineFrameLayout(MachineFunction &MF,
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bool UpdateMF = true,
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bool UseEstimate = false) const;
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/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
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/// the function.
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void emitPrologue(MachineFunction &MF) const override;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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bool hasFP(const MachineFunction &MF) const override;
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bool needsFP(const MachineFunction &MF) const;
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void replaceFPWithRealFP(MachineFunction &MF) const;
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void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS = nullptr) const override;
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void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS = nullptr) const override;
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void addScavengingSpillSlot(MachineFunction &MF, RegScavenger *RS) const;
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bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const override;
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void eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const override;
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bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const override;
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/// targetHandlesStackFrameRounding - Returns true if the target is
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/// responsible for rounding up the stack frame (probably at emitPrologue
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/// time).
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bool targetHandlesStackFrameRounding() const override { return true; }
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/// getReturnSaveOffset - Return the previous frame offset to save the
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/// return address.
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static unsigned getReturnSaveOffset(bool isPPC64, bool isDarwinABI) {
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if (isDarwinABI)
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return isPPC64 ? 16 : 8;
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// SVR4 ABI:
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return isPPC64 ? 16 : 4;
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}
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/// getTOCSaveOffset - Return the previous frame offset to save the
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/// TOC register -- 64-bit SVR4 ABI only.
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static unsigned getTOCSaveOffset(void) {
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return 40;
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}
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/// getFramePointerSaveOffset - Return the previous frame offset to save the
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/// frame pointer.
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static unsigned getFramePointerSaveOffset(bool isPPC64, bool isDarwinABI) {
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// For the Darwin ABI:
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// We cannot use the TOC save slot (offset +20) in the PowerPC linkage area
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// for saving the frame pointer (if needed.) While the published ABI has
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// not used this slot since at least MacOSX 10.2, there is older code
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// around that does use it, and that needs to continue to work.
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if (isDarwinABI)
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return isPPC64 ? -8U : -4U;
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// SVR4 ABI: First slot in the general register save area.
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return isPPC64 ? -8U : -4U;
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}
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/// getBasePointerSaveOffset - Return the previous frame offset to save the
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/// base pointer.
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static unsigned getBasePointerSaveOffset(bool isPPC64, bool isDarwinABI) {
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if (isDarwinABI)
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return isPPC64 ? -16U : -8U;
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// SVR4 ABI: First slot in the general register save area.
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return isPPC64 ? -16U : -8U;
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}
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/// getLinkageSize - Return the size of the PowerPC ABI linkage area.
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///
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static unsigned getLinkageSize(bool isPPC64, bool isDarwinABI) {
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if (isDarwinABI || isPPC64)
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return 6 * (isPPC64 ? 8 : 4);
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// SVR4 ABI:
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return 8;
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}
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const SpillSlot *
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getCalleeSavedSpillSlots(unsigned &NumEntries) const override;
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};
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} // End llvm namespace
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#endif
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