[DebugInfo] Examine all uses of isDebugValue() for debug instructions.

Because we create a new kind of debug instruction, DBG_LABEL, we need to
check all passes which use isDebugValue() to check MachineInstr is debug
instruction or not. When expelling debug instructions, we should expel
both DBG_VALUE and DBG_LABEL. So, I create a new function,
isDebugInstr(), in MachineInstr to check whether the MachineInstr is
debug instruction or not.

This patch has no new test case. I have run regression test and there is
no difference in regression test.

Differential Revision: https://reviews.llvm.org/D45342

Patch by Hsiangkai Wang.

llvm-svn: 331844

3 files changed, 9 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 89e047a24f6..7fde84b254b 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1059,7 +1059,7 @@ void AsmPrinter::EmitFunctionBody() {
     for (auto &MI : MBB) {
       // Print the assembly for the instruction.
       if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
-          !MI.isDebugValue()) {
+          !MI.isDebugInstr()) {
         HasAnyRealCode = true;
         ++NumInstsInFunction;
       }
diff --git a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
index a7bc8a84818..0af3d1521eb 100644
--- a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
@@ -2589,8 +2589,8 @@ void CodeViewDebug::endFunctionImpl(const MachineFunction *MF) {
 void CodeViewDebug::beginInstruction(const MachineInstr *MI) {
   DebugHandlerBase::beginInstruction(MI);
 
-  // Ignore DBG_VALUE locations and function prologue.
-  if (!Asm || !CurFn || MI->isDebugValue() ||
+  // Ignore DBG_VALUE and DBG_LABEL locations and function prologue.
+  if (!Asm || !CurFn || MI->isDebugInstr() ||
       MI->getFlag(MachineInstr::FrameSetup))
     return;
 
@@ -2599,7 +2599,7 @@ void CodeViewDebug::beginInstruction(const MachineInstr *MI) {
   DebugLoc DL = MI->getDebugLoc();
   if (!DL && MI->getParent() != PrevInstBB) {
     for (const auto &NextMI : *MI->getParent()) {
-      if (NextMI.isDebugValue())
+      if (NextMI.isDebugInstr())
         continue;
       DL = NextMI.getDebugLoc();
       if (DL)
diff --git a/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp b/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
index c6c661dddf9..daa045939ce 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
@@ -198,7 +198,7 @@ void llvm::calculateDbgValueHistory(const MachineFunction *MF,
   RegDescribedVarsMap RegVars;
   for (const auto &MBB : *MF) {
     for (const auto &MI : MBB) {
-      if (!MI.isDebugValue()) {
+      if (!MI.isDebugInstr()) {
         // Not a DBG_VALUE instruction. It may clobber registers which describe
         // some variables.
         for (const MachineOperand &MO : MI.operands()) {
@@ -234,6 +234,10 @@ void llvm::calculateDbgValueHistory(const MachineFunction *MF,
         continue;
       }
 
+      // Skip DBG_LABEL instructions.
+      if (MI.isDebugLabel())
+        continue;
+
       assert(MI.getNumOperands() > 1 && "Invalid DBG_VALUE instruction!");
       // Use the base variable (without any DW_OP_piece expressions)
       // as index into History. The full variables including the