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Reapply r128045 and r128051 with fixes.

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This will extend the ranges of debug info variables in registers until they are
clobbered.

Fix 1: Don't mistake DBG_VALUE instructions referring to incoming arguments on
the stack with DBG_VALUE instructions referring to variables in the frame
pointer. This fixes the gdb test-suite failure.

Fix 2: Don't trace through copies to physical registers setting up call
arguments. These registers are call clobbered, and the source register is more
likely to be a callee-saved register that can be extended through the call
instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128114 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-03-22 22:33:08 +00:00
parent 27c6baeca2
commit 28cf1156c9
4 changed files with 95 additions and 58 deletions
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24
lib/CodeGen/LiveDebugVariables.cpp
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@ -101,10 +101,6 @@ class UserValue {
void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx, unsigned LocNo,
LiveIntervals &LIS, const TargetInstrInfo &TII);
/// insertDebugKill - Insert an undef DBG_VALUE into MBB at Idx.
void insertDebugKill(MachineBasicBlock *MBB, SlotIndex Idx,
LiveIntervals &LIS, const TargetInstrInfo &TII);
public:
/// UserValue - Create a new UserValue.
UserValue(const MDNode *var, unsigned o, DebugLoc L,
@ -515,6 +511,13 @@ UserValue::addDefsFromCopies(LiveInterval *LI, unsigned LocNo,
MachineInstr *MI = &*UI;
unsigned DstReg = MI->getOperand(0).getReg();
// Don't follow copies to physregs. These are usually setting up call
// arguments, and the argument registers are always call clobbered. We are
// better off in the source register which could be a callee-saved register,
// or it could be spilled.
if (!TargetRegisterInfo::isVirtualRegister(DstReg))
continue;
// Is LocNo extended to reach this copy? If not, another def may be blocking
// it, or we are looking at a wrong value of LI.
SlotIndex Idx = LIS.getInstructionIndex(MI);
@ -752,13 +755,6 @@ void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
.addOperand(Loc).addImm(offset).addMetadata(variable);
}
void UserValue::insertDebugKill(MachineBasicBlock *MBB, SlotIndex Idx,
LiveIntervals &LIS, const TargetInstrInfo &TII) {
MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, LIS);
BuildMI(*MBB, I, findDebugLoc(), TII.get(TargetOpcode::DBG_VALUE)).addReg(0)
.addImm(offset).addMetadata(variable);
}
void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
const TargetInstrInfo &TII) {
MachineFunction::iterator MFEnd = VRM->getMachineFunction().end();
@ -790,12 +786,6 @@ void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
break;
++I;
if (Stop == MBBEnd)
continue;
// The current interval ends before MBB.
// Insert a kill if there is a gap.
if (!I.valid() || I.start() > Stop)
insertDebugKill(MBB, Stop, LIS, TII);
}
}