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WIP: Refactor some code so that it can be called by more than just one method. No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189849 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2013-09-03 20:59:07 +00:00
parent 9f59ffcb54
commit b9daaa02a2
1 changed files with 92 additions and 81 deletions
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173
lib/Target/X86/X86FrameLowering.cpp
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@ -483,90 +483,17 @@ encodeCompactUnwindRegistersWithFrame(unsigned SavedRegs[CU_NUM_SAVED_REGS],
return RegEnc;
}
uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
const X86RegisterInfo *RegInfo = TM.getRegisterInfo();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
unsigned StackPtr = RegInfo->getStackRegister();
bool Is64Bit = STI.is64Bit();
bool HasFP = hasFP(MF);
unsigned SavedRegs[CU_NUM_SAVED_REGS] = { 0, 0, 0, 0, 0, 0 };
unsigned SavedRegIdx = 0;
unsigned OffsetSize = (Is64Bit ? 8 : 4);
unsigned PushInstr = (Is64Bit ? X86::PUSH64r : X86::PUSH32r);
unsigned PushInstrSize = 1;
unsigned MoveInstr = (Is64Bit ? X86::MOV64rr : X86::MOV32rr);
unsigned MoveInstrSize = (Is64Bit ? 3 : 2);
unsigned SubtractInstrIdx = (Is64Bit ? 3 : 2);
unsigned StackDivide = (Is64Bit ? 8 : 4);
unsigned InstrOffset = 0;
unsigned StackAdjust = 0;
unsigned StackSize = 0;
MachineBasicBlock &MBB = MF.front(); // Prologue is in entry BB.
bool ExpectEnd = false;
for (MachineBasicBlock::iterator
MBBI = MBB.begin(), MBBE = MBB.end(); MBBI != MBBE; ++MBBI) {
MachineInstr &MI = *MBBI;
unsigned Opc = MI.getOpcode();
if (Opc == X86::PROLOG_LABEL) continue;
if (!MI.getFlag(MachineInstr::FrameSetup)) break;
// We don't exect any more prolog instructions.
if (ExpectEnd) return CU::UNWIND_MODE_DWARF;
if (Opc == PushInstr) {
// If there are too many saved registers, we cannot use compact encoding.
if (SavedRegIdx >= CU_NUM_SAVED_REGS) return CU::UNWIND_MODE_DWARF;
unsigned Reg = MI.getOperand(0).getReg();
if (Reg == (Is64Bit ? X86::RAX : X86::EAX)) {
ExpectEnd = true;
continue;
}
SavedRegs[SavedRegIdx++] = MI.getOperand(0).getReg();
StackAdjust += OffsetSize;
InstrOffset += PushInstrSize;
} else if (Opc == MoveInstr) {
unsigned SrcReg = MI.getOperand(1).getReg();
unsigned DstReg = MI.getOperand(0).getReg();
if (DstReg != FramePtr || SrcReg != StackPtr)
return CU::UNWIND_MODE_DWARF;
StackAdjust = 0;
memset(SavedRegs, 0, sizeof(SavedRegs));
SavedRegIdx = 0;
InstrOffset += MoveInstrSize;
} else if (Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 ||
Opc == X86::SUB32ri || Opc == X86::SUB32ri8) {
if (StackSize)
// We already have a stack size.
return CU::UNWIND_MODE_DWARF;
if (!MI.getOperand(0).isReg() ||
MI.getOperand(0).getReg() != MI.getOperand(1).getReg() ||
MI.getOperand(0).getReg() != StackPtr || !MI.getOperand(2).isImm())
// We need this to be a stack adjustment pointer. Something like:
//
// %RSP<def> = SUB64ri8 %RSP, 48
return CU::UNWIND_MODE_DWARF;
StackSize = MI.getOperand(2).getImm() / StackDivide;
SubtractInstrIdx += InstrOffset;
ExpectEnd = true;
}
}
static uint32_t
doCompactUnwindEncoding(unsigned SavedRegs[CU_NUM_SAVED_REGS],
unsigned StackSize, unsigned StackAdjust,
unsigned SubtractInstrIdx, unsigned SavedRegIdx,
bool Is64Bit, bool HasFP) {
// Encode that we are using EBP/RBP as the frame pointer.
unsigned StackDivide = (Is64Bit ? 8 : 4);
uint32_t CompactUnwindEncoding = 0;
StackAdjust /= StackDivide;
if (HasFP) {
if ((StackAdjust & 0xFF) != StackAdjust)
// Offset was too big for compact encoding.
@ -622,6 +549,90 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
return CompactUnwindEncoding;
}
uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
const X86RegisterInfo *RegInfo = TM.getRegisterInfo();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
unsigned StackPtr = RegInfo->getStackRegister();
bool Is64Bit = STI.is64Bit();
unsigned SavedRegs[CU_NUM_SAVED_REGS] = { 0, 0, 0, 0, 0, 0 };
unsigned SavedRegIdx = 0;
unsigned OffsetSize = (Is64Bit ? 8 : 4);
unsigned PushInstr = (Is64Bit ? X86::PUSH64r : X86::PUSH32r);
unsigned PushInstrSize = 1;
unsigned MoveInstr = (Is64Bit ? X86::MOV64rr : X86::MOV32rr);
unsigned MoveInstrSize = (Is64Bit ? 3 : 2);
unsigned SubtractInstrIdx = (Is64Bit ? 3 : 2);
unsigned StackDivide = (Is64Bit ? 8 : 4);
unsigned InstrOffset = 0;
unsigned StackAdjust = 0;
unsigned StackSize = 0;
bool ExpectEnd = false;
for (MachineBasicBlock::iterator MBBI = MF.front().begin(),
MBBE = MF.front().end(); MBBI != MBBE; ++MBBI) {
MachineInstr &MI = *MBBI;
unsigned Opc = MI.getOpcode();
if (Opc == X86::PROLOG_LABEL) continue;
if (!MI.getFlag(MachineInstr::FrameSetup)) break;
// We don't exect any more prolog instructions.
if (ExpectEnd) return CU::UNWIND_MODE_DWARF;
if (Opc == PushInstr) {
// If there are too many saved registers, we cannot use compact encoding.
if (SavedRegIdx >= CU_NUM_SAVED_REGS) return CU::UNWIND_MODE_DWARF;
unsigned Reg = MI.getOperand(0).getReg();
if (Reg == (Is64Bit ? X86::RAX : X86::EAX)) {
ExpectEnd = true;
continue;
}
SavedRegs[SavedRegIdx++] = MI.getOperand(0).getReg();
StackAdjust += OffsetSize;
InstrOffset += PushInstrSize;
} else if (Opc == MoveInstr) {
unsigned SrcReg = MI.getOperand(1).getReg();
unsigned DstReg = MI.getOperand(0).getReg();
if (DstReg != FramePtr || SrcReg != StackPtr)
return CU::UNWIND_MODE_DWARF;
StackAdjust = 0;
memset(SavedRegs, 0, sizeof(SavedRegs));
SavedRegIdx = 0;
InstrOffset += MoveInstrSize;
} else if (Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 ||
Opc == X86::SUB32ri || Opc == X86::SUB32ri8) {
if (StackSize)
// We already have a stack size.
return CU::UNWIND_MODE_DWARF;
if (!MI.getOperand(0).isReg() ||
MI.getOperand(0).getReg() != MI.getOperand(1).getReg() ||
MI.getOperand(0).getReg() != StackPtr || !MI.getOperand(2).isImm())
// We need this to be a stack adjustment pointer. Something like:
//
// %RSP<def> = SUB64ri8 %RSP, 48
return CU::UNWIND_MODE_DWARF;
StackSize = MI.getOperand(2).getImm() / StackDivide;
SubtractInstrIdx += InstrOffset;
ExpectEnd = true;
}
}
return doCompactUnwindEncoding(SavedRegs, StackSize, StackAdjust,
SubtractInstrIdx, SavedRegIdx,
Is64Bit, hasFP(MF));
}
/// usesTheStack - This function checks if any of the users of EFLAGS
/// copies the EFLAGS. We know that the code that lowers COPY of EFLAGS has
/// to use the stack, and if we don't adjust the stack we clobber the first