Preserve deleted function's local variables' debug info.
Radar 8122864.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107027 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 92b4fef..265296a 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1386,6 +1386,7 @@
/// If there are global variables in this scope then create and insert
/// DIEs for these variables.
DIE *DwarfDebug::updateSubprogramScopeDIE(const MDNode *SPNode) {
+ ProcessedSPNodes.insert(SPNode);
CompileUnit *SPCU = getCompileUnit(SPNode);
DIE *SPDie = SPCU->getDIE(SPNode);
assert(SPDie && "Unable to find subprogram DIE!");
@@ -2005,6 +2006,40 @@
///
void DwarfDebug::endModule() {
if (!FirstCU) return;
+ const Module *M = MMI->getModule();
+ if (NamedMDNode *AllSPs = M->getNamedMetadata("llvm.dbg.sp")) {
+ for (unsigned SI = 0, SE = AllSPs->getNumOperands(); SI != SE; ++SI) {
+ if (ProcessedSPNodes.count(AllSPs->getOperand(SI)) != 0) continue;
+ DISubprogram SP(AllSPs->getOperand(SI));
+ if (!SP.Verify()) continue;
+
+ // Collect info for variables that were optimized out.
+ StringRef FName = SP.getLinkageName();
+ if (FName.empty())
+ FName = SP.getName();
+ NamedMDNode *NMD =
+ M->getNamedMetadata(Twine("llvm.dbg.lv.", getRealLinkageName(FName)));
+ if (!NMD) continue;
+ unsigned E = NMD->getNumOperands();
+ if (!E) continue;
+ DbgScope *Scope = new DbgScope(NULL, DIDescriptor(SP), NULL);
+ for (unsigned I = 0; I != E; ++I) {
+ DIVariable DV(NMD->getOperand(I));
+ if (!DV.Verify()) continue;
+ Scope->addVariable(new DbgVariable(DV));
+ }
+
+ // Construct subprogram DIE and add variables DIEs.
+ constructSubprogramDIE(SP);
+ DIE *ScopeDIE = getCompileUnit(SP)->getDIE(SP);
+ const SmallVector<DbgVariable *, 8> &Variables = Scope->getVariables();
+ for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
+ DIE *VariableDIE = constructVariableDIE(Variables[i], Scope);
+ if (VariableDIE)
+ ScopeDIE->addChild(VariableDIE);
+ }
+ }
+ }
// Attach DW_AT_inline attribute with inlined subprogram DIEs.
for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),