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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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33
lib/CodeGen/LiveDebugVariables.cpp
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@ -108,6 +108,7 @@ class LDVImpl;
class UserValue {
const MDNode *variable; ///< The debug info variable we are part of.
unsigned offset; ///< Byte offset into variable.
bool Indirect; ///< true if this is a register-indirect+offset value.
DebugLoc dl; ///< The debug location for the variable. This is
///< used by dwarf writer to find lexical scope.
UserValue *leader; ///< Equivalence class leader.
@ -134,9 +135,10 @@ class UserValue {
public:
/// UserValue - Create a new UserValue.
UserValue(const MDNode *var, unsigned o, DebugLoc L,
UserValue(const MDNode *var, unsigned o, bool i, DebugLoc L,
LocMap::Allocator &alloc)
: variable(var), offset(o), dl(L), leader(this), next(0), locInts(alloc)
: variable(var), offset(o), Indirect(i), dl(L), leader(this),
next(0), locInts(alloc)
{}
/// getLeader - Get the leader of this value's equivalence class.
@ -299,7 +301,8 @@ class LDVImpl {
UVMap userVarMap;
/// getUserValue - Find or create a UserValue.
UserValue *getUserValue(const MDNode *Var, unsigned Offset, DebugLoc DL);
UserValue *getUserValue(const MDNode *Var, unsigned Offset,
bool Indirect, DebugLoc DL);
/// lookupVirtReg - Find the EC leader for VirtReg or null.
UserValue *lookupVirtReg(unsigned VirtReg);
@ -414,7 +417,7 @@ void UserValue::mapVirtRegs(LDVImpl *LDV) {
}
UserValue *LDVImpl::getUserValue(const MDNode *Var, unsigned Offset,
DebugLoc DL) {
bool Indirect, DebugLoc DL) {
UserValue *&Leader = userVarMap[Var];
if (Leader) {
UserValue *UV = Leader->getLeader();
@ -424,7 +427,7 @@ UserValue *LDVImpl::getUserValue(const MDNode *Var, unsigned Offset,
return UV;
}
UserValue *UV = new UserValue(Var, Offset, DL, allocator);
UserValue *UV = new UserValue(Var, Offset, Indirect, DL, allocator);
userValues.push_back(UV);
Leader = UserValue::merge(Leader, UV);
return UV;
@ -445,15 +448,17 @@ UserValue *LDVImpl::lookupVirtReg(unsigned VirtReg) {
bool LDVImpl::handleDebugValue(MachineInstr *MI, SlotIndex Idx) {
// DBG_VALUE loc, offset, variable
if (MI->getNumOperands() != 3 ||
!MI->getOperand(1).isImm() || !MI->getOperand(2).isMetadata()) {
!(MI->getOperand(1).isReg() || MI->getOperand(1).isImm()) ||
!MI->getOperand(2).isMetadata()) {
DEBUG(dbgs() << "Can't handle " << *MI);
return false;
}
// Get or create the UserValue for (variable,offset).
unsigned Offset = MI->getOperand(1).getImm();
bool Indirect = MI->getOperand(1).isImm();
unsigned Offset = Indirect ? MI->getOperand(1).getImm() : 0;
const MDNode *Var = MI->getOperand(2).getMetadata();
UserValue *UV = getUserValue(Var, Offset, MI->getDebugLoc());
UserValue *UV = getUserValue(Var, Offset, Indirect, MI->getDebugLoc());
UV->addDef(Idx, MI->getOperand(0));
return true;
}
@ -924,7 +929,8 @@ void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
// Frame index locations may require a target callback.
if (Loc.isFI()) {
MachineInstr *MI = TII.emitFrameIndexDebugValue(*MBB->getParent(),
Loc.getIndex(), offset, variable,
Loc.getIndex(),
offset, variable,
findDebugLoc());
if (MI) {
MBB->insert(I, MI);
@ -932,8 +938,13 @@ void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
}
}
// This is not a frame index, or the target is happy with a standard FI.
BuildMI(*MBB, I, findDebugLoc(), TII.get(TargetOpcode::DBG_VALUE))
.addOperand(Loc).addImm(offset).addMetadata(variable);
if (Loc.isReg())
BuildMI(*MBB, I, findDebugLoc(), TII.get(TargetOpcode::DBG_VALUE),
Indirect, Loc.getReg(), offset, variable);
else
BuildMI(*MBB, I, findDebugLoc(), TII.get(TargetOpcode::DBG_VALUE))
.addOperand(Loc).addImm(offset).addMetadata(variable);
}
void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,