Partial revert of 132882.

[oota-llvm.git] / lib / CodeGen / AsmPrinter / AsmPrinter.cpp

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index d830e9766b76d39b528baa8b342c4e7010f5ff21..161afbafb57b179ab89ec9155a8846465b33d5ba 100644 (file)
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -38,6 +38,7 @@
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetLowering.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetOptions.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 #include "llvm/Assembly/Writer.h"
 #include "llvm/ADT/SmallString.h"
@@ -188,21 +189,22 @@ bool AsmPrinter::doInitialization(Module &M) {
   if (MAI->doesSupportDebugInformation())
     DD = new DwarfDebug(this, &M);
 
-  if (MAI->doesSupportExceptionHandling())
-    switch (MAI->getExceptionHandlingType()) {
-    default:
-    case ExceptionHandling::DwarfTable:
-      DE = new DwarfTableException(this);
-      break;
-    case ExceptionHandling::DwarfCFI:
-      DE = new DwarfCFIException(this);
-      break;
-    case ExceptionHandling::ARM:
-      DE = new ARMException(this);
-      break;
-    }
+  switch (MAI->getExceptionHandlingType()) {
+  case ExceptionHandling::None:
+    return false;
+  case ExceptionHandling::SjLj:
+  case ExceptionHandling::DwarfCFI:
+    DE = new DwarfCFIException(this);
+    return false;
+  case ExceptionHandling::ARM:
+    DE = new ARMException(this);
+    return false;
+  case ExceptionHandling::Win64:
+    DE = new Win64Exception(this);
+    return false;
+  }
 
-  return false;
+  llvm_unreachable("Unknown exception type.");
 }
 
 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
@@ -267,7 +269,7 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
   }
 
   MCSymbol *GVSym = Mang->getSymbol(GV);
-  EmitVisibility(GVSym, GV->getVisibility());
+  EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
 
   if (!GV->hasInitializer())   // External globals require no extra code.
     return;
@@ -591,18 +593,32 @@ static bool EmitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
   return true;
 }
 
+AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
+  if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
+      MF->getFunction()->needsUnwindTableEntry())
+    return CFI_M_EH;
+
+  if (MMI->hasDebugInfo())
+    return CFI_M_Debug;
+
+  return CFI_M_None;
+}
+
+bool AsmPrinter::needsSEHMoves() {
+  return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
+    MF->getFunction()->needsUnwindTableEntry();
+}
+
 void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
   MCSymbol *Label = MI.getOperand(0).getMCSymbol();
 
-  if (MAI->doesDwarfRequireFrameSection() ||
-      MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
-    OutStreamer.EmitLabel(Label);
-
   if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
     return;
 
-  const MachineFunction &MF = *MI.getParent()->getParent();
-  MachineModuleInfo &MMI = MF.getMMI();
+  if (needsCFIMoves() == CFI_M_None)
+    return;
+
+  MachineModuleInfo &MMI = MF->getMMI();
   std::vector<MachineMove> &Moves = MMI.getFrameMoves();
   bool FoundOne = false;
   (void)FoundOne;
@@ -675,6 +691,9 @@ void AsmPrinter::EmitFunctionBody() {
         if (isVerbose()) EmitKill(II, *this);
         break;
       default:
+        if (!TM.hasMCUseLoc())
+          MCLineEntry::Make(&OutStreamer, getCurrentSection());
+
         EmitInstruction(II);
         break;
       }
@@ -751,36 +770,49 @@ getDebugValueLocation(const MachineInstr *MI) const {
 
 /// EmitDwarfRegOp - Emit dwarf register operation.
 void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc) const {
-  const TargetRegisterInfo *RI = TM.getRegisterInfo();
-  unsigned Reg = RI->getDwarfRegNum(MLoc.getReg(), false);
+  const TargetRegisterInfo *TRI = TM.getRegisterInfo();
+  int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
+
+  for (const unsigned *SR = TRI->getSuperRegisters(MLoc.getReg());
+       *SR && Reg < 0; ++SR) {
+    Reg = TRI->getDwarfRegNum(*SR, false);
+    // FIXME: Get the bit range this register uses of the superregister
+    // so that we can produce a DW_OP_bit_piece
+  }
+
+  // FIXME: Handle cases like a super register being encoded as
+  // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
+
+  // FIXME: We have no reasonable way of handling errors in here. The
+  // caller might be in the middle of an dwarf expression. We should
+  // probably assert that Reg >= 0 once debug info generation is more mature.
+
   if (int Offset =  MLoc.getOffset()) {
-    // If the value is at a certain offset from frame register then
-    // use DW_OP_fbreg.
-    unsigned OffsetSize = Offset ? MCAsmInfo::getSLEB128Size(Offset) : 1;
-    OutStreamer.AddComment("Loc expr size");
-    EmitInt16(1 + OffsetSize);
-    OutStreamer.AddComment(
-      dwarf::OperationEncodingString(dwarf::DW_OP_fbreg));
-    EmitInt8(dwarf::DW_OP_fbreg);
-    OutStreamer.AddComment("Offset");
+    if (Reg < 32) {
+      OutStreamer.AddComment(
+        dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
+      EmitInt8(dwarf::DW_OP_breg0 + Reg);
+    } else {
+      OutStreamer.AddComment("DW_OP_bregx");
+      EmitInt8(dwarf::DW_OP_bregx);
+      OutStreamer.AddComment(Twine(Reg));
+      EmitULEB128(Reg);
+    }
     EmitSLEB128(Offset);
   } else {
     if (Reg < 32) {
-      OutStreamer.AddComment("Loc expr size");
-      EmitInt16(1);
       OutStreamer.AddComment(
         dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
       EmitInt8(dwarf::DW_OP_reg0 + Reg);
     } else {
-      OutStreamer.AddComment("Loc expr size");
-      EmitInt16(1 + MCAsmInfo::getULEB128Size(Reg));
-      OutStreamer.AddComment(
-        dwarf::OperationEncodingString(dwarf::DW_OP_regx));
+      OutStreamer.AddComment("DW_OP_regx");
       EmitInt8(dwarf::DW_OP_regx);
       OutStreamer.AddComment(Twine(Reg));
       EmitULEB128(Reg);
     }
   }
+
+  // FIXME: Produce a DW_OP_bit_piece if we used a superregister
 }
 
 bool AsmPrinter::doFinalization(Module &M) {