Add DEBUG messages.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134572 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 0c23e4a..99d27e4 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1885,8 +1885,12 @@
if (Prev->isDebugValue()) {
// Coalesce identical entries at the end of History.
if (History.size() >= 2 &&
- Prev->isIdenticalTo(History[History.size() - 2]))
+ Prev->isIdenticalTo(History[History.size() - 2])) {
+ DEBUG(dbgs() << "Coalesce identical DBG_VALUE entries:\n"
+ << "\t" << *Prev
+ << "\t" << *History[History.size() - 2] << "\n");
History.pop_back();
+ }
// Terminate old register assignments that don't reach MI;
MachineFunction::const_iterator PrevMBB = Prev->getParent();
@@ -1896,9 +1900,12 @@
// its basic block.
MachineBasicBlock::const_iterator LastMI =
PrevMBB->getLastNonDebugInstr();
- if (LastMI == PrevMBB->end())
+ if (LastMI == PrevMBB->end()) {
// Drop DBG_VALUE for empty range.
+ DEBUG(dbgs() << "Drop DBG_VALUE for empty range:\n"
+ << "\t" << *Prev << "\n");
History.pop_back();
+ }
else {
// Terminate after LastMI.
History.push_back(LastMI);