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Set the compact unwind encoding to 'requires EH DWARF' if we cannot generate a CU encoding. 

llvm-svn: 179808
This commit is contained in:
Bill Wendling 2013-04-18 22:55:29 +00:00
parent b12da6be75
commit 0c3fad7efc
1 changed files with 9 additions and 9 deletions
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18
llvm/lib/Target/X86/X86FrameLowering.cpp
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@ -528,11 +528,11 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
if (!MI.getFlag(MachineInstr::FrameSetup)) break;
// We don't exect any more prolog instructions.
if (ExpectEnd) return 0;
if (ExpectEnd) return 0x04000000;
if (Opc == PushInstr) {
// If there are too many saved registers, we cannot use compact encoding.
if (SavedRegIdx >= CU_NUM_SAVED_REGS) return 0;
if (SavedRegIdx >= CU_NUM_SAVED_REGS) return 0x04000000;
SavedRegs[SavedRegIdx++] = MI.getOperand(0).getReg();
StackAdjust += OffsetSize;
@ -542,7 +542,7 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
unsigned DstReg = MI.getOperand(0).getReg();
if (DstReg != FramePtr || SrcReg != StackPtr)
return 0;
return 0x04000000;
StackAdjust = 0;
memset(SavedRegs, 0, sizeof(SavedRegs));
@ -552,7 +552,7 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
Opc == X86::SUB32ri || Opc == X86::SUB32ri8) {
if (StackSize)
// We already have a stack size.
return 0;
return 0x04000000;
if (!MI.getOperand(0).isReg() ||
MI.getOperand(0).getReg() != MI.getOperand(1).getReg() ||
@ -560,7 +560,7 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
// We need this to be a stack adjustment pointer. Something like:
//
// %RSP<def> = SUB64ri8 %RSP, 48
return 0;
return 0x04000000;
StackSize = MI.getOperand(2).getImm() / StackDivide;
SubtractInstrIdx += InstrOffset;
@ -574,11 +574,11 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
if (HasFP) {
if ((StackAdjust & 0xFF) != StackAdjust)
// Offset was too big for compact encoding.
return 0;
return 0x04000000;
// Get the encoding of the saved registers when we have a frame pointer.
uint32_t RegEnc = encodeCompactUnwindRegistersWithFrame(SavedRegs, Is64Bit);
if (RegEnc == ~0U) return 0;
if (RegEnc == ~0U) return 0x04000000;
CompactUnwindEncoding |= 0x01000000;
CompactUnwindEncoding |= (StackAdjust & 0xFF) << 16;
@ -595,7 +595,7 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
} else {
if ((StackAdjust & 0x7) != StackAdjust)
// The extra stack adjustments are too big for us to handle.
return 0;
return 0x04000000;
// Frameless stack with an offset too large for us to encode compactly.
CompactUnwindEncoding |= 0x03000000;
@ -616,7 +616,7 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
uint32_t RegEnc =
encodeCompactUnwindRegistersWithoutFrame(SavedRegs, SavedRegIdx,
Is64Bit);
if (RegEnc == ~0U) return 0;
if (RegEnc == ~0U) return 0x04000000;
// Encode the register encoding.
CompactUnwindEncoding |= RegEnc & 0x3FF;