| //===-- PPCFrameLowering.h - Define frame lowering for PowerPC --*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef POWERPC_FRAMEINFO_H |
| #define POWERPC_FRAMEINFO_H |
| |
| #include "PPC.h" |
| #include "PPCSubtarget.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/Target/TargetFrameLowering.h" |
| #include "llvm/Target/TargetMachine.h" |
| |
| namespace llvm { |
| class PPCSubtarget; |
| |
| class PPCFrameLowering: public TargetFrameLowering { |
| const PPCSubtarget &Subtarget; |
| |
| public: |
| PPCFrameLowering(const PPCSubtarget &sti) |
| : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, |
| (sti.hasQPX() || sti.isBGQ()) ? 32 : 16, 0), |
| Subtarget(sti) { |
| } |
| |
| void determineFrameLayout(MachineFunction &MF) const; |
| |
| /// emitProlog/emitEpilog - These methods insert prolog and epilog code into |
| /// the function. |
| void emitPrologue(MachineFunction &MF) const; |
| void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const; |
| |
| bool hasFP(const MachineFunction &MF) const; |
| bool needsFP(const MachineFunction &MF) const; |
| |
| void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, |
| RegScavenger *RS = NULL) const; |
| void processFunctionBeforeFrameFinalized(MachineFunction &MF) const; |
| |
| bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, |
| const std::vector<CalleeSavedInfo> &CSI, |
| const TargetRegisterInfo *TRI) const; |
| |
| void eliminateCallFramePseudoInstr(MachineFunction &MF, |
| MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I) const; |
| |
| bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, |
| const std::vector<CalleeSavedInfo> &CSI, |
| const TargetRegisterInfo *TRI) const; |
| |
| /// targetHandlesStackFrameRounding - Returns true if the target is |
| /// responsible for rounding up the stack frame (probably at emitPrologue |
| /// time). |
| bool targetHandlesStackFrameRounding() const { return true; } |
| |
| /// getReturnSaveOffset - Return the previous frame offset to save the |
| /// return address. |
| static unsigned getReturnSaveOffset(bool isPPC64, bool isDarwinABI) { |
| if (isDarwinABI) |
| return isPPC64 ? 16 : 8; |
| // SVR4 ABI: |
| return isPPC64 ? 16 : 4; |
| } |
| |
| /// getFramePointerSaveOffset - Return the previous frame offset to save the |
| /// frame pointer. |
| static unsigned getFramePointerSaveOffset(bool isPPC64, bool isDarwinABI) { |
| // For the Darwin ABI: |
| // We cannot use the TOC save slot (offset +20) in the PowerPC linkage area |
| // for saving the frame pointer (if needed.) While the published ABI has |
| // not used this slot since at least MacOSX 10.2, there is older code |
| // around that does use it, and that needs to continue to work. |
| if (isDarwinABI) |
| return isPPC64 ? -8U : -4U; |
| |
| // SVR4 ABI: First slot in the general register save area. |
| return isPPC64 ? -8U : -4U; |
| } |
| |
| /// getLinkageSize - Return the size of the PowerPC ABI linkage area. |
| /// |
| static unsigned getLinkageSize(bool isPPC64, bool isDarwinABI) { |
| if (isDarwinABI || isPPC64) |
| return 6 * (isPPC64 ? 8 : 4); |
| |
| // SVR4 ABI: |
| return 8; |
| } |
| |
| /// getMinCallArgumentsSize - Return the size of the minium PowerPC ABI |
| /// argument area. |
| static unsigned getMinCallArgumentsSize(bool isPPC64, bool isDarwinABI) { |
| // For the Darwin ABI / 64-bit SVR4 ABI: |
| // The prolog code of the callee may store up to 8 GPR argument registers to |
| // the stack, allowing va_start to index over them in memory if its varargs. |
| // Because we cannot tell if this is needed on the caller side, we have to |
| // conservatively assume that it is needed. As such, make sure we have at |
| // least enough stack space for the caller to store the 8 GPRs. |
| if (isDarwinABI || isPPC64) |
| return 8 * (isPPC64 ? 8 : 4); |
| |
| // 32-bit SVR4 ABI: |
| // There is no default stack allocated for the 8 first GPR arguments. |
| return 0; |
| } |
| |
| /// getMinCallFrameSize - Return the minimum size a call frame can be using |
| /// the PowerPC ABI. |
| static unsigned getMinCallFrameSize(bool isPPC64, bool isDarwinABI) { |
| // The call frame needs to be at least big enough for linkage and 8 args. |
| return getLinkageSize(isPPC64, isDarwinABI) + |
| getMinCallArgumentsSize(isPPC64, isDarwinABI); |
| } |
| |
| // With the SVR4 ABI, callee-saved registers have fixed offsets on the stack. |
| const SpillSlot * |
| getCalleeSavedSpillSlots(unsigned &NumEntries) const { |
| if (Subtarget.isDarwinABI()) { |
| NumEntries = 1; |
| if (Subtarget.isPPC64()) { |
| static const SpillSlot darwin64Offsets = {PPC::X31, -8}; |
| return &darwin64Offsets; |
| } else { |
| static const SpillSlot darwinOffsets = {PPC::R31, -4}; |
| return &darwinOffsets; |
| } |
| } |
| |
| // Early exit if not using the SVR4 ABI. |
| if (!Subtarget.isSVR4ABI()) { |
| NumEntries = 0; |
| return 0; |
| } |
| |
| // Note that the offsets here overlap, but this is fixed up in |
| // processFunctionBeforeFrameFinalized. |
| |
| static const SpillSlot Offsets[] = { |
| // Floating-point register save area offsets. |
| {PPC::F31, -8}, |
| {PPC::F30, -16}, |
| {PPC::F29, -24}, |
| {PPC::F28, -32}, |
| {PPC::F27, -40}, |
| {PPC::F26, -48}, |
| {PPC::F25, -56}, |
| {PPC::F24, -64}, |
| {PPC::F23, -72}, |
| {PPC::F22, -80}, |
| {PPC::F21, -88}, |
| {PPC::F20, -96}, |
| {PPC::F19, -104}, |
| {PPC::F18, -112}, |
| {PPC::F17, -120}, |
| {PPC::F16, -128}, |
| {PPC::F15, -136}, |
| {PPC::F14, -144}, |
| |
| // General register save area offsets. |
| {PPC::R31, -4}, |
| {PPC::R30, -8}, |
| {PPC::R29, -12}, |
| {PPC::R28, -16}, |
| {PPC::R27, -20}, |
| {PPC::R26, -24}, |
| {PPC::R25, -28}, |
| {PPC::R24, -32}, |
| {PPC::R23, -36}, |
| {PPC::R22, -40}, |
| {PPC::R21, -44}, |
| {PPC::R20, -48}, |
| {PPC::R19, -52}, |
| {PPC::R18, -56}, |
| {PPC::R17, -60}, |
| {PPC::R16, -64}, |
| {PPC::R15, -68}, |
| {PPC::R14, -72}, |
| |
| // CR save area offset. We map each of the nonvolatile CR fields |
| // to the slot for CR2, which is the first of the nonvolatile CR |
| // fields to be assigned, so that we only allocate one save slot. |
| // See PPCRegisterInfo::hasReservedSpillSlot() for more information. |
| {PPC::CR2, -4}, |
| |
| // VRSAVE save area offset. |
| {PPC::VRSAVE, -4}, |
| |
| // Vector register save area |
| {PPC::V31, -16}, |
| {PPC::V30, -32}, |
| {PPC::V29, -48}, |
| {PPC::V28, -64}, |
| {PPC::V27, -80}, |
| {PPC::V26, -96}, |
| {PPC::V25, -112}, |
| {PPC::V24, -128}, |
| {PPC::V23, -144}, |
| {PPC::V22, -160}, |
| {PPC::V21, -176}, |
| {PPC::V20, -192} |
| }; |
| |
| static const SpillSlot Offsets64[] = { |
| // Floating-point register save area offsets. |
| {PPC::F31, -8}, |
| {PPC::F30, -16}, |
| {PPC::F29, -24}, |
| {PPC::F28, -32}, |
| {PPC::F27, -40}, |
| {PPC::F26, -48}, |
| {PPC::F25, -56}, |
| {PPC::F24, -64}, |
| {PPC::F23, -72}, |
| {PPC::F22, -80}, |
| {PPC::F21, -88}, |
| {PPC::F20, -96}, |
| {PPC::F19, -104}, |
| {PPC::F18, -112}, |
| {PPC::F17, -120}, |
| {PPC::F16, -128}, |
| {PPC::F15, -136}, |
| {PPC::F14, -144}, |
| |
| // General register save area offsets. |
| {PPC::X31, -8}, |
| {PPC::X30, -16}, |
| {PPC::X29, -24}, |
| {PPC::X28, -32}, |
| {PPC::X27, -40}, |
| {PPC::X26, -48}, |
| {PPC::X25, -56}, |
| {PPC::X24, -64}, |
| {PPC::X23, -72}, |
| {PPC::X22, -80}, |
| {PPC::X21, -88}, |
| {PPC::X20, -96}, |
| {PPC::X19, -104}, |
| {PPC::X18, -112}, |
| {PPC::X17, -120}, |
| {PPC::X16, -128}, |
| {PPC::X15, -136}, |
| {PPC::X14, -144}, |
| |
| // VRSAVE save area offset. |
| {PPC::VRSAVE, -4}, |
| |
| // Vector register save area |
| {PPC::V31, -16}, |
| {PPC::V30, -32}, |
| {PPC::V29, -48}, |
| {PPC::V28, -64}, |
| {PPC::V27, -80}, |
| {PPC::V26, -96}, |
| {PPC::V25, -112}, |
| {PPC::V24, -128}, |
| {PPC::V23, -144}, |
| {PPC::V22, -160}, |
| {PPC::V21, -176}, |
| {PPC::V20, -192} |
| }; |
| |
| if (Subtarget.isPPC64()) { |
| NumEntries = array_lengthof(Offsets64); |
| |
| return Offsets64; |
| } else { |
| NumEntries = array_lengthof(Offsets); |
| |
| return Offsets; |
| } |
| } |
| }; |
| |
| } // End llvm namespace |
| |
| #endif |
