Update LLVM to r98631.

1 files changed, 37 insertions, 71 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfException.cpp b/lib/CodeGen/AsmPrinter/DwarfException.cpp
index 11a01fe..4946b4c 100644
--- a/lib/CodeGen/AsmPrinter/DwarfException.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfException.cpp
@@ -50,25 +50,6 @@ DwarfException::~DwarfException() {
   delete ExceptionTimer;
 }
 
-/// CreateLabelDiff - Emit a label and subtract it from the expression we
-/// already have.  This is equivalent to emitting "foo - .", but we have to emit
-/// the label for "." directly.
-const MCExpr *DwarfException::CreateLabelDiff(const MCExpr *ExprRef,
-                                              const char *LabelName,
-                                              unsigned Index) {
-  SmallString<64> Name;
-  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
-                            << LabelName << Asm->getFunctionNumber()
-                            << "_" << Index;
-  MCSymbol *DotSym = Asm->OutContext.GetOrCreateTemporarySymbol(Name.str());
-  Asm->OutStreamer.EmitLabel(DotSym);
-
-  return MCBinaryExpr::CreateSub(ExprRef,
-                                 MCSymbolRefExpr::Create(DotSym,
-                                                         Asm->OutContext),
-                                 Asm->OutContext);
-}
-
 /// EmitCIE - Emit a Common Information Entry (CIE). This holds information that
 /// is shared among many Frame Description Entries.  There is at least one CIE
 /// in every non-empty .debug_frame section.
@@ -169,7 +150,7 @@ void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
   // Indicate locations of general callee saved registers in frame.
   std::vector<MachineMove> Moves;
   RI->getInitialFrameState(Moves);
-  EmitFrameMoves(NULL, 0, Moves, true);
+  EmitFrameMoves(0, Moves, true);
 
   // On Darwin the linker honors the alignment of eh_frame, which means it must
   // be 8-byte on 64-bit targets to match what gcc does.  Otherwise you get
@@ -240,12 +221,13 @@ void DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) {
                                  EHFrameInfo.PersonalityIndex),
                       true, true);
 
+    MCSymbol *EHFuncBeginSym = getDWLabel("eh_func_begin", EHFrameInfo.Number);
 
     Asm->OutStreamer.AddComment("FDE initial location");
-    EmitReference(getDWLabel("eh_func_begin", EHFrameInfo.Number), FDEEncoding);
+    EmitReference(EHFuncBeginSym, FDEEncoding);
+    
     Asm->OutStreamer.AddComment("FDE address range");
-    EmitDifference(getDWLabel("eh_func_end", EHFrameInfo.Number),
-                   getDWLabel("eh_func_begin", EHFrameInfo.Number),
+    EmitDifference(getDWLabel("eh_func_end", EHFrameInfo.Number),EHFuncBeginSym,
                    SizeOfEncodedValue(FDEEncoding) == 4);
 
     // If there is a personality and landing pads then point to the language
@@ -265,8 +247,7 @@ void DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) {
     }
 
     // Indicate locations of function specific callee saved registers in frame.
-    EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves,
-                   true);
+    EmitFrameMoves(EHFuncBeginSym, EHFrameInfo.Moves, true);
 
     // On Darwin the linker honors the alignment of eh_frame, which means it
     // must be 8-byte on 64-bit targets to match what gcc does.  Otherwise you
@@ -473,7 +454,7 @@ ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
                      const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
                      const SmallVectorImpl<unsigned> &FirstActions) {
   // The end label of the previous invoke or nounwind try-range.
-  unsigned LastLabel = 0;
+  MCSymbol *LastLabel = 0;
 
   // Whether there is a potentially throwing instruction (currently this means
   // an ordinary call) between the end of the previous try-range and now.
@@ -490,14 +471,11 @@ ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
       if (!MI->isLabel()) {
         if (MI->getDesc().isCall())
           SawPotentiallyThrowing |= !CallToNoUnwindFunction(MI);
-
         continue;
       }
 
-      unsigned BeginLabel = MI->getOperand(0).getImm();
-      assert(BeginLabel && "Invalid label!");
-
       // End of the previous try-range?
+      MCSymbol *BeginLabel = MI->getOperand(0).getMCSymbol();
       if (BeginLabel == LastLabel)
         SawPotentiallyThrowing = false;
 
@@ -599,7 +577,6 @@ void DwarfException::EmitExceptionTable() {
   const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
   const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
   const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
-  if (PadInfos.empty()) return;
 
   // Sort the landing pads in order of their type ids.  This is used to fold
   // duplicate actions.
@@ -624,7 +601,7 @@ void DwarfException::EmitExceptionTable() {
   for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
     const LandingPadInfo *LandingPad = LandingPads[i];
     for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
-      unsigned BeginLabel = LandingPad->BeginLabels[j];
+      MCSymbol *BeginLabel = LandingPad->BeginLabels[j];
       assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
       PadRange P = { i, j };
       PadMap[BeginLabel] = P;
@@ -809,45 +786,33 @@ void DwarfException::EmitExceptionTable() {
     for (SmallVectorImpl<CallSiteEntry>::const_iterator
          I = CallSites.begin(), E = CallSites.end(); I != E; ++I) {
       const CallSiteEntry &S = *I;
-      const char *BeginTag;
-      unsigned BeginNumber;
-
-      if (!S.BeginLabel) {
-        BeginTag = "eh_func_begin";
-        BeginNumber = SubprogramCount;
-      } else {
-        BeginTag = "label";
-        BeginNumber = S.BeginLabel;
-      }
-
+      
+      MCSymbol *EHFuncBeginSym = getDWLabel("eh_func_begin", SubprogramCount);
+      
+      MCSymbol *BeginLabel = S.BeginLabel;
+      if (BeginLabel == 0)
+        BeginLabel = EHFuncBeginSym;
+      MCSymbol *EndLabel = S.EndLabel;
+      if (EndLabel == 0)
+        EndLabel = getDWLabel("eh_func_end", SubprogramCount);
+        
       // Offset of the call site relative to the previous call site, counted in
       // number of 16-byte bundles. The first call site is counted relative to
       // the start of the procedure fragment.
       Asm->OutStreamer.AddComment("Region start");
-      EmitSectionOffset(getDWLabel(BeginTag, BeginNumber),
-                        getDWLabel("eh_func_begin", SubprogramCount),
-                        true, true);
-
+      EmitSectionOffset(BeginLabel, EHFuncBeginSym, true, true);
+      
       Asm->OutStreamer.AddComment("Region length");
-      if (!S.EndLabel)
-        EmitDifference(getDWLabel("eh_func_end", SubprogramCount),
-                       getDWLabel(BeginTag, BeginNumber),
-                       true);
-      else
-        EmitDifference(getDWLabel("label", S.EndLabel), 
-                       getDWLabel(BeginTag, BeginNumber), true);
+      EmitDifference(EndLabel, BeginLabel, true);
 
 
       // Offset of the landing pad, counted in 16-byte bundles relative to the
       // @LPStart address.
       Asm->OutStreamer.AddComment("Landing pad");
-      if (!S.PadLabel) {
+      if (!S.PadLabel)
         Asm->OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
-      } else {
-        EmitSectionOffset(getDWLabel("label", S.PadLabel),
-                          getDWLabel("eh_func_begin", SubprogramCount),
-                          true, true);
-      }
+      else
+        EmitSectionOffset(S.PadLabel, EHFuncBeginSym, true, true);
 
       // Offset of the first associated action record, relative to the start of
       // the action table. This value is biased by 1 (1 indicates the start of
@@ -947,16 +912,11 @@ void DwarfException::BeginFunction(const MachineFunction *MF) {
   this->MF = MF;
   shouldEmitTable = shouldEmitMoves = false;
 
-  // Map all labels and get rid of any dead landing pads.
-  MMI->TidyLandingPads();
-
   // If any landing pads survive, we need an EH table.
-  if (!MMI->getLandingPads().empty())
-    shouldEmitTable = true;
+  shouldEmitTable = !MMI->getLandingPads().empty();
 
   // See if we need frame move info.
-  if (!MF->getFunction()->doesNotThrow() || UnwindTablesMandatory)
-    shouldEmitMoves = true;
+  shouldEmitMoves = !MF->getFunction()->doesNotThrow() || UnwindTablesMandatory;
 
   if (shouldEmitMoves || shouldEmitTable)
     // Assumes in correct section after the entry point.
@@ -978,7 +938,16 @@ void DwarfException::EndFunction() {
     ExceptionTimer->startTimer();
 
   Asm->OutStreamer.EmitLabel(getDWLabel("eh_func_end", SubprogramCount));
-  EmitExceptionTable();
+
+  // Record if this personality index uses a landing pad.
+  bool HasLandingPad = !MMI->getLandingPads().empty();
+  UsesLSDA[MMI->getPersonalityIndex()] |= HasLandingPad;
+  
+  // Map all labels and get rid of any dead landing pads.
+  MMI->TidyLandingPads();
+
+  if (HasLandingPad)
+    EmitExceptionTable();
 
   const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
   MCSymbol *FunctionEHSym =
@@ -993,9 +962,6 @@ void DwarfException::EndFunction() {
                                          MMI->getFrameMoves(),
                                          MF->getFunction()));
 
-  // Record if this personality index uses a landing pad.
-  UsesLSDA[MMI->getPersonalityIndex()] |= !MMI->getLandingPads().empty();
-
   if (TimePassesIsEnabled)
     ExceptionTimer->stopTimer();
 }