Add an atomic lowering pass

[oota-llvm.git] / lib / Target / TargetLoweringObjectFile.cpp

diff --git a/lib/Target/TargetLoweringObjectFile.cpp b/lib/Target/TargetLoweringObjectFile.cpp
index 8c12039516b590a49001f45177b17a0a7c6022e4..dd7b532bbfbaef701376d24ce1aea43711b8ea63 100644 (file)
--- a/lib/Target/TargetLoweringObjectFile.cpp
+++ b/lib/Target/TargetLoweringObjectFile.cpp
@@ -19,6 +19,7 @@
 #include "llvm/GlobalVariable.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/Target/Mangler.h"
 #include "llvm/Target/TargetData.h"
@@ -100,7 +101,7 @@ static bool IsNullTerminatedString(const Constant *C) {
 
     ConstantInt *Null =
       dyn_cast<ConstantInt>(CVA->getOperand(ATy->getNumElements()-1));
-    if (Null == 0 || Null->getZExtValue() != 0)
+    if (Null == 0 || !Null->isZero())
       return false; // Not null terminated.
 
     // Verify that the null doesn't occur anywhere else in the string.
@@ -290,45 +291,38 @@ TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const {
   return DataSection;
 }
 
-/// getSymbolForDwarfGlobalReference - Return an MCExpr to use for a
+/// getExprForDwarfGlobalReference - Return an MCExpr to use for a
 /// reference to the specified global variable from exception
 /// handling information.
 const MCExpr *TargetLoweringObjectFile::
-getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
-                             MachineModuleInfo *MMI, unsigned Encoding) const {
-  // FIXME: Use GetGlobalValueSymbol.
-  SmallString<128> Name;
-  Mang->getNameWithPrefix(Name, GV, false);
-  const MCSymbol *Sym;
-  
-  if (GV->hasPrivateLinkage())
-    Sym = getContext().GetOrCreateTemporarySymbol(Name.str());
-  else
-    Sym = getContext().GetOrCreateSymbol(Name.str());
-
-  return getSymbolForDwarfReference(Sym, MMI, Encoding);
+getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
+                               MachineModuleInfo *MMI, unsigned Encoding,
+                               MCStreamer &Streamer) const {
+  const MCSymbol *Sym = Mang->getSymbol(GV);
+  return getExprForDwarfReference(Sym, Mang, MMI, Encoding, Streamer);
 }
 
 const MCExpr *TargetLoweringObjectFile::
-getSymbolForDwarfReference(const MCSymbol *Sym, MachineModuleInfo *MMI,
-                           unsigned Encoding) const {
+getExprForDwarfReference(const MCSymbol *Sym, Mangler *Mang,
+                         MachineModuleInfo *MMI, unsigned Encoding,
+                         MCStreamer &Streamer) const {
   const MCExpr *Res = MCSymbolRefExpr::Create(Sym, getContext());
 
   switch (Encoding & 0xF0) {
   default:
-    llvm_report_error("We do not support this DWARF encoding yet!");
-    break;
+    report_fatal_error("We do not support this DWARF encoding yet!");
   case dwarf::DW_EH_PE_absptr:
     // Do nothing special
-    break;
-  case dwarf::DW_EH_PE_pcrel:
-    // FIXME: PCSymbol
-    const MCExpr *PC = MCSymbolRefExpr::Create(".", getContext());
-    Res = MCBinaryExpr::CreateSub(Res, PC, getContext());
-    break;
+    return Res;
+  case dwarf::DW_EH_PE_pcrel: {
+    // Emit a label to the streamer for the current position.  This gives us
+    // .-foo addressing.
+    MCSymbol *PCSym = getContext().CreateTempSymbol();
+    Streamer.EmitLabel(PCSym);
+    const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, getContext());
+    return MCBinaryExpr::CreateSub(Res, PC, getContext());
+  }
   }
-
-  return Res;
 }
 
 unsigned TargetLoweringObjectFile::getPersonalityEncoding() const {