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Change the informal convention of DBG_VALUE so that we can express a

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register-indirect address with an offset of 0.
It used to be that a DBG_VALUE is a register-indirect value if the offset
(operand 1) is nonzero. The new convention is that a DBG_VALUE is
register-indirect if the first operand is a register and the second
operand is an immediate. For plain registers use the combination reg, reg.

rdar://problem/13658587

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180816 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl
2013-04-30 22:16:46 +00:00
parent f13fc1b23a
commit a2b56692c8
14 changed files with 222 additions and 45 deletions
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12
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -1115,7 +1115,8 @@ static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
assert(MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
return MI->getNumOperands() == 3 &&
MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
MI->getOperand(1).isImm() && MI->getOperand(1).getImm() == 0;
(MI->getOperand(1).isImm() ||
(MI->getOperand(1).isReg() && MI->getOperand(1).getReg() == 0U));
}
// Get .debug_loc entry for the instruction range starting at MI.
@ -1129,12 +1130,11 @@ static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
MachineLocation MLoc = Asm->getDebugValueLocation(MI);
return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
}
if (MI->getOperand(0).isReg() && MI->getOperand(1).isImm()) {
if (MI->getOperand(0).isReg()) {
MachineLocation MLoc;
// TODO: Currently an offset of 0 in a DBG_VALUE means
// we need to generate a direct register value.
// There is no way to specify an indirect value with offset 0.
if (MI->getOperand(1).getImm() == 0)
// If the second operand is an immediate, this is a
// register-indirect address.
if (!MI->getOperand(1).isImm())
MLoc.set(MI->getOperand(0).getReg());
else
MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());