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Handle callee saved registers in dwarf frame info (lead up to exception

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handling.)

llvm-svn: 29954
This commit is contained in:
Jim Laskey 2006-08-29 16:24:26 +00:00
parent 27420577d7
commit d44e9493e6
2 changed files with 48 additions and 15 deletions
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44
lib/CodeGen/DwarfWriter.cpp
View File

@ -35,7 +35,7 @@ using namespace llvm::dwarf;
static cl::opt<bool> static cl::opt<bool>
DwarfVerbose("dwarf-verbose", cl::Hidden, DwarfVerbose("dwarf-verbose", cl::Hidden,
cl::desc("Add comments to Dwarf directives.")); cl::desc("Add comments to Dwarf directives."));
namespace llvm { namespace llvm {
@ -1946,7 +1946,7 @@ void DwarfWriter::EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
// Advance row if new location. // Advance row if new location.
if (BaseLabel && LabelID && BaseLabelID != LabelID) { if (BaseLabel && LabelID && BaseLabelID != LabelID) {
EmitULEB128Bytes(DW_CFA_advance_loc4); EmitInt8(DW_CFA_advance_loc4);
EOL("DW_CFA_advance_loc4"); EOL("DW_CFA_advance_loc4");
EmitDifference("loc", LabelID, BaseLabel, BaseLabelID); EmitDifference("loc", LabelID, BaseLabel, BaseLabelID);
EOL(""); EOL("");
@ -1955,30 +1955,56 @@ void DwarfWriter::EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
BaseLabel = "loc"; BaseLabel = "loc";
} }
int stackGrowth =
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
AddressSize : -AddressSize;
// If advancing cfa. // If advancing cfa.
if (Dst.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) { if (Dst.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) {
if (!Src.isRegister()) { if (!Src.isRegister()) {
if (Src.getRegister() == MachineLocation::VirtualFP) { if (Src.getRegister() == MachineLocation::VirtualFP) {
EmitULEB128Bytes(DW_CFA_def_cfa_offset); EmitInt8(DW_CFA_def_cfa_offset);
EOL("DW_CFA_def_cfa_offset"); EOL("DW_CFA_def_cfa_offset");
} else { } else {
EmitULEB128Bytes(DW_CFA_def_cfa); EmitInt8(DW_CFA_def_cfa);
EOL("DW_CFA_def_cfa"); EOL("DW_CFA_def_cfa");
EmitULEB128Bytes(RI->getDwarfRegNum(Src.getRegister())); EmitULEB128Bytes(RI->getDwarfRegNum(Src.getRegister()));
EOL("Register"); EOL("Register");
} }
int stackGrowth = int Offset = Src.getOffset() / stackGrowth;
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
AddressSize : -AddressSize;
EmitULEB128Bytes(Src.getOffset() / stackGrowth); EmitULEB128Bytes(Offset);
EOL("Offset"); EOL("Offset");
} else { } else {
assert(0 && "Machine move no supported yet.");
} }
} else { } else {
unsigned Reg = RI->getDwarfRegNum(Src.getRegister());
int Offset = Dst.getOffset() / stackGrowth;
if (Offset < 0) {
EmitInt8(DW_CFA_offset_extended_sf);
EOL("DW_CFA_offset_extended_sf");
EmitULEB128Bytes(Reg);
EOL("Reg");
EmitSLEB128Bytes(Offset);
EOL("Offset");
} else if (Reg < 64) {
EmitInt8(DW_CFA_offset + Reg);
EOL("DW_CFA_offset + Reg");
EmitULEB128Bytes(Offset);
EOL("Offset");
} else {
EmitInt8(DW_CFA_offset_extended);
EOL("DW_CFA_offset_extended");
EmitULEB128Bytes(Reg);
EOL("Reg");
EmitULEB128Bytes(Offset);
EOL("Offset");
}
} }
} }
} }

19
lib/Target/PowerPC/PPCRegisterInfo.cpp
View File

@ -668,15 +668,22 @@ void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
std::vector<MachineMove *> &Moves = DebugInfo->getFrameMoves(); std::vector<MachineMove *> &Moves = DebugInfo->getFrameMoves();
unsigned LabelID = DebugInfo->NextLabelID(); unsigned LabelID = DebugInfo->NextLabelID();
// Show update of SP.
MachineLocation Dst(MachineLocation::VirtualFP);
MachineLocation Src(MachineLocation::VirtualFP, NegNumbytes);
Moves.push_back(new MachineMove(LabelID, Dst, Src));
// Mark effective beginning of when frame pointer becomes valid. // Mark effective beginning of when frame pointer becomes valid.
BuildMI(MBB, MBBI, PPC::DWARF_LABEL, 1).addImm(LabelID); BuildMI(MBB, MBBI, PPC::DWARF_LABEL, 1).addImm(LabelID);
// Show update of SP.
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP, NegNumbytes);
Moves.push_back(new MachineMove(LabelID, SPDst, SPSrc));
// Add callee saved registers to move list.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
MachineLocation CSDst(MachineLocation::VirtualFP,
MFI->getObjectOffset(CSI[I].getFrameIdx()));
MachineLocation CSSrc(CSI[I].getReg());
Moves.push_back(new MachineMove(LabelID, CSDst, CSSrc));
}
} }
// If there is a frame pointer, copy R1 (SP) into R31 (FP) // If there is a frame pointer, copy R1 (SP) into R31 (FP)