LICM pass now understands invariant load metadata. Nothing generates this yet so...

[oota-llvm.git] / lib / MC / MCDwarf.cpp

diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp
index ba3bda0bc9a561fb0e8b62f338e7799ba0becfe5..49828080e01e1fb208accdbf6be6d8c88e2377a6 100644 (file)
--- a/lib/MC/MCDwarf.cpp
+++ b/lib/MC/MCDwarf.cpp
@@ -7,20 +7,20 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCObjectWriter.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/ADT/FoldingSet.h"
 #include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/Twine.h"
 using namespace llvm;
 
@@ -196,7 +196,7 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS,
   MCOS->EmitLabel(SectionEnd);
 
   // Switch back the the dwarf line section.
-  MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection());
+  MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfLineSection());
 
   const MCAsmInfo &asmInfo = MCOS->getContext().getAsmInfo();
   MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd,
@@ -209,7 +209,7 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS,
 void MCDwarfFileTable::Emit(MCStreamer *MCOS) {
   MCContext &context = MCOS->getContext();
   // Switch to the section where the table will be emitted into.
-  MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection());
+  MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfLineSection());
 
   // Create a symbol at the beginning of this section.
   MCSymbol *LineStartSym = context.CreateTempSymbol();
@@ -503,10 +503,11 @@ namespace {
     bool IsEH;
     const MCSymbol *SectionStart;
   public:
-    FrameEmitterImpl(bool usingCFI, bool isEH, const MCSymbol *sectionStart) :
-      CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
-      SectionStart(sectionStart) {
-    }
+    FrameEmitterImpl(bool usingCFI, bool isEH)
+      : CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
+        SectionStart(0) {}
+
+    void setSectionStart(const MCSymbol *Label) { SectionStart = Label; }
 
     /// EmitCompactUnwind - Emit the unwind information in a compact way. If
     /// we're successful, return 'true'. Otherwise, return 'false' and it will
@@ -688,7 +689,7 @@ void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer,
 bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
                                          const MCDwarfFrameInfo &Frame) {
   MCContext &Context = Streamer.getContext();
-  const TargetAsmInfo &TAI = Context.getTargetAsmInfo();
+  const MCObjectFileInfo *MOFI = Context.getObjectFileInfo();
   bool VerboseAsm = Streamer.isVerboseAsm();
 
   // range-start range-length  compact-unwind-enc personality-func   lsda
@@ -720,10 +721,10 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
   if (Frame.Lsda)
     Encoding |= 0x40000000;
 
-  Streamer.SwitchSection(TAI.getCompactUnwindSection());
+  Streamer.SwitchSection(MOFI->getCompactUnwindSection());
 
   // Range Start
-  unsigned FDEEncoding = TAI.getFDEEncoding(UsingCFI);
+  unsigned FDEEncoding = MOFI->getFDEEncoding(UsingCFI);
   unsigned Size = getSizeForEncoding(Streamer, FDEEncoding);
   if (VerboseAsm) Streamer.AddComment("Range Start");
   Streamer.EmitSymbolValue(Frame.Function, Size);
@@ -736,8 +737,8 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
 
   // Compact Encoding
   Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_udata4);
-  if (VerboseAsm) Streamer.AddComment(Twine("Compact Unwind Encoding: 0x") +
-                                      Twine(llvm::utohexstr(Encoding)));
+  if (VerboseAsm) Streamer.AddComment("Compact Unwind Encoding: 0x" +
+                                      Twine::utohexstr(Encoding));
   Streamer.EmitIntValue(Encoding, Size);
 
 
@@ -767,11 +768,11 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
                                           unsigned lsdaEncoding) {
   MCContext &context = streamer.getContext();
   const MCRegisterInfo &MRI = context.getRegisterInfo();
-  const TargetAsmInfo &TAI = context.getTargetAsmInfo();
+  const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
   bool verboseAsm = streamer.isVerboseAsm();
 
   MCSymbol *sectionStart;
-  if (TAI.isFunctionEHFrameSymbolPrivate() || !IsEH)
+  if (MOFI->isFunctionEHFrameSymbolPrivate() || !IsEH)
     sectionStart = context.CreateTempSymbol();
   else
     sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum));
@@ -854,7 +855,7 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
       EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding");
 
     // Encoding of the FDE pointers
-    EmitEncodingByte(streamer, TAI.getFDEEncoding(UsingCFI),
+    EmitEncodingByte(streamer, MOFI->getFDEEncoding(UsingCFI),
                      "FDE Encoding");
   }
 
@@ -890,10 +891,10 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
   MCContext &context = streamer.getContext();
   MCSymbol *fdeStart = context.CreateTempSymbol();
   MCSymbol *fdeEnd = context.CreateTempSymbol();
-  const TargetAsmInfo &TAI = context.getTargetAsmInfo();
+  const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
   bool verboseAsm = streamer.isVerboseAsm();
 
-  if (!TAI.isFunctionEHFrameSymbolPrivate() && IsEH) {
+  if (IsEH && frame.Function && !MOFI->isFunctionEHFrameSymbolPrivate()) {
     MCSymbol *EHSym =
       context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh"));
     streamer.EmitEHSymAttributes(frame.Function, EHSym);
@@ -922,7 +923,7 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
     streamer.EmitSymbolValue(&cieStart, 4);
   }
 
-  unsigned fdeEncoding = TAI.getFDEEncoding(UsingCFI);
+  unsigned fdeEncoding = MOFI->getFDEEncoding(UsingCFI);
   unsigned size = getSizeForEncoding(streamer, fdeEncoding);
 
   // PC Begin
@@ -1008,26 +1009,34 @@ void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer,
                                bool UsingCFI,
                                bool IsEH) {
   MCContext &Context = Streamer.getContext();
-  const TargetAsmInfo &TAI = Context.getTargetAsmInfo();
-  const MCSection &Section = IsEH ? *TAI.getEHFrameSection() :
-                                    *TAI.getDwarfFrameSection();
+  MCObjectFileInfo *MOFI =
+    const_cast<MCObjectFileInfo*>(Context.getObjectFileInfo());
+  FrameEmitterImpl Emitter(UsingCFI, IsEH);
+  ArrayRef<MCDwarfFrameInfo> FrameArray = Streamer.getFrameInfos();
+
+  // Emit the compact unwind info if available.
+  // FIXME: This emits both the compact unwind and the old CIE/FDE
+  //        information. Only one of those is needed.
+  if (IsEH && MOFI->getCompactUnwindSection())
+    for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) {
+      const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i);
+      if (!Frame.CompactUnwindEncoding)
+        Emitter.EmitCompactUnwind(Streamer, Frame);
+    }
+
+  const MCSection &Section = IsEH ? *MOFI->getEHFrameSection() :
+                                    *MOFI->getDwarfFrameSection();
   Streamer.SwitchSection(&Section);
   MCSymbol *SectionStart = Context.CreateTempSymbol();
   Streamer.EmitLabel(SectionStart);
+  Emitter.setSectionStart(SectionStart);
 
   MCSymbol *FDEEnd = NULL;
   DenseMap<CIEKey, const MCSymbol*> CIEStarts;
-  FrameEmitterImpl Emitter(UsingCFI, IsEH, SectionStart);
 
   const MCSymbol *DummyDebugKey = NULL;
-  for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) {
-    const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i);
-    if (IsEH && TAI.getCompactUnwindSection() &&
-        Emitter.EmitCompactUnwind(Streamer, Frame)) {
-      FDEEnd = NULL;
-      continue;
-    }
-
+  for (unsigned i = 0, n = FrameArray.size(); i < n; ++i) {
+    const MCDwarfFrameInfo &Frame = FrameArray[i];
     CIEKey Key(Frame.Personality, Frame.PersonalityEncoding,
                Frame.LsdaEncoding);
     const MCSymbol *&CIEStart = IsEH ? CIEStarts[Key] : DummyDebugKey;