http://llvm.org/bugs/show_bug.cgi?id=22762
Bug ID: 22762
Summary: DW_AT_frame_base with frame register isn't encoded
with DW_OP_fbreg
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 13978
--> http://llvm.org/bugs/attachment.cgi?id=13978&action=edit
A testcase
DwarfExpression::AddMachineRegIndirect in DwarfExpression.cpp has
bool DwarfExpression::AddMachineRegIndirect(unsigned MachineReg, int Offset) {
int DwarfReg = getTRI()->getDwarfRegNum(MachineReg, false);
if (DwarfReg < 0)
return false;
if (isFrameRegister(MachineReg)) {
// If variable offset is based in frame register then use fbreg.
EmitOp(dwarf::DW_OP_fbreg);
EmitSigned(Offset);
} else {
AddRegIndirect(DwarfReg, Offset);
}
return true;
}
X32 uses EBP as frame register and EBP doesn't map to a DWARF register
number. But frame register is special, which should be mapped to
DW_OP_fbreg, regardless its DWARF register number. The check of
DwarfReg < 0 should be moved after if (isFrameRegister(MachineReg))
check.
./llc -mtriple=x86_64-pc-linux-gnux32 -filetype=obj -o x.o x.ll
readelf -w x.o | grep DW_AT_frame_base
<2b> DW_AT_frame_base : 3 byte block: 56 93 4 (DW_OP_reg6 (rbp);
DW_OP_piece: 4)
DW_AT_frame_base DW_FORM_exprloc
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