}
}
+/// isDbgValueInUndefinedReg - Return true if debug value, encoded by
+/// DBG_VALUE instruction, is in undefined reg.
+static bool isDbgValueInUndefinedReg(const MachineInstr *MI) {
+ assert (MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
+ if (MI->getOperand(0).isReg() && !MI->getOperand(0).getReg())
+ return true;
+ return false;
+}
+
/// isDbgValueInDefinedReg - Return true if debug value, encoded by
/// DBG_VALUE instruction, is in a defined reg.
static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
II != IE; ++II) {
const MachineInstr *MInsn = II;
- if (!MInsn->isDebugValue())
+ if (!MInsn->isDebugValue() || isDbgValueInUndefinedReg(MInsn))
continue;
DbgValues.push_back(MInsn);
}
ME = DbgValues.end(); MI != ME; ++MI) {
const MDNode *Var =
(*MI)->getOperand((*MI)->getNumOperands()-1).getMetadata();
- if (Var == DV &&
+ if (Var == DV && isDbgValueInDefinedReg(*MI) &&
!PrevMI->isIdenticalTo(*MI))
MultipleValues.push_back(*MI);
PrevMI = *MI;
}
- DbgScope *Scope = NULL;
+ DbgScope *Scope = findDbgScope(MInsn);
+ bool CurFnArg = false;
if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
DISubprogram(DV.getContext()).describes(MF->getFunction()))
+ CurFnArg = true;
+ if (!Scope && CurFnArg)
Scope = CurrentFnDbgScope;
- else
- Scope = findDbgScope(MInsn);
// If variable scope is not found then skip this variable.
if (!Scope)
continue;
using namespace llvm;
+static cl::opt<bool>
+EnableLDV("live-debug-variables",
+ cl::desc("Enable the live debug variables pass"), cl::Hidden);
+
char LiveDebugVariables::ID = 0;
INITIALIZE_PASS_BEGIN(LiveDebugVariables, "livedebugvars",
}
bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) {
+ if (!EnableLDV)
+ return false;
if (!pImpl)
pImpl = new LDVImpl(this);
return static_cast<LDVImpl*>(pImpl)->runOnMachineFunction(mf);
!13 = metadata !{i32 7, i32 0, metadata !14, null}
!14 = metadata !{i32 524299, metadata !8, i32 6, i32 0} ; [ DW_TAG_lexical_block ]
-;CHECK:Ltmp8
+;CHECK: DEBUG_VALUE: bar:x <- EBX+0
+;CHECK-NEXT:Ltmp
;CHECK-NEXT: DEBUG_VALUE: foo:y <- 1+0