Revert "Introduce a string_ostream string builder facilty"
[oota-llvm.git] / lib / CodeGen / AsmPrinter / DwarfCFIException.cpp
index 93c965930f1b29bca45048b513a6294aab7202a9..74215aa695ddbf487f872cc3ae7a621502985539 100644 (file)
 //===----------------------------------------------------------------------===//
 
 #include "DwarfException.h"
-#include "llvm/Module.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/IR/Module.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/MC/MachineLocation.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
 #include "llvm/Target/TargetFrameLowering.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Support/Dwarf.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/ADT/Twine.h"
 using namespace llvm;
 
 DwarfCFIException::DwarfCFIException(AsmPrinter *A)
-  : DwarfException(A),
-    shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
-    {}
+  : EHStreamer(A), shouldEmitPersonality(false), shouldEmitLSDA(false),
+    shouldEmitMoves(false), moveTypeModule(AsmPrinter::CFI_M_None) {}
 
 DwarfCFIException::~DwarfCFIException() {}
 
-/// EndModule - Emit all exception information that should come after the
+/// endModule - Emit all exception information that should come after the
 /// content.
-void DwarfCFIException::EndModule() {
-  if (Asm->MAI->getExceptionHandlingType() != ExceptionHandling::Dwarf)
-    return;
+void DwarfCFIException::endModule() {
+  if (moveTypeModule == AsmPrinter::CFI_M_Debug)
+    Asm->OutStreamer.EmitCFISections(false, true);
 
-  if (!shouldEmitTableModule)
+  if (!Asm->MAI->isExceptionHandlingDwarf())
     return;
 
   const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+
   unsigned PerEncoding = TLOF.getPersonalityEncoding();
 
-  // Begin eh frame section.
-  Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
+  if ((PerEncoding & 0x80) != dwarf::DW_EH_PE_indirect)
+    return;
 
   // Emit references to all used personality functions
   const std::vector<const Function*> &Personalities = MMI->getPersonalities();
   for (size_t i = 0, e = Personalities.size(); i != e; ++i) {
-    Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("personality", i));
-    Asm->EmitReference(Personalities[i], PerEncoding);
+    if (!Personalities[i])
+      continue;
+    MCSymbol *Sym = Asm->getSymbol(Personalities[i]);
+    TLOF.emitPersonalityValue(Asm->OutStreamer, Asm->TM, Sym);
   }
 }
 
-/// BeginFunction - Gather pre-function exception information. Assumes it's
+/// beginFunction - Gather pre-function exception information. Assumes it's
 /// being emitted immediately after the function entry point.
-void DwarfCFIException::BeginFunction(const MachineFunction *MF) {
-  shouldEmitTable = shouldEmitMoves = false;
+void DwarfCFIException::beginFunction(const MachineFunction *MF) {
+  shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
 
   // If any landing pads survive, we need an EH table.
-  shouldEmitTable = !MMI->getLandingPads().empty();
+  bool hasLandingPads = !MMI->getLandingPads().empty();
 
   // See if we need frame move info.
-  shouldEmitMoves =
-    !Asm->MF->getFunction()->doesNotThrow() || UnwindTablesMandatory;
+  AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
+  if (MoveType == AsmPrinter::CFI_M_EH ||
+      (MoveType == AsmPrinter::CFI_M_Debug &&
+       moveTypeModule == AsmPrinter::CFI_M_None))
+    moveTypeModule = MoveType;
+
+  shouldEmitMoves = MoveType != AsmPrinter::CFI_M_None;
 
-  if (shouldEmitMoves || shouldEmitTable)
-    // Assumes in correct section after the entry point.
-    Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
-                                                  Asm->getFunctionNumber()));
+  const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+  unsigned PerEncoding = TLOF.getPersonalityEncoding();
+  const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
 
-  shouldEmitTableModule |= shouldEmitTable;
+  shouldEmitPersonality = hasLandingPads &&
+    PerEncoding != dwarf::DW_EH_PE_omit && Per;
 
-  if (shouldEmitMoves) {
-    const TargetFrameLowering *TFL = Asm->TM.getFrameLowering();
-    Asm->OutStreamer.EmitCFIStartProc();
+  unsigned LSDAEncoding = TLOF.getLSDAEncoding();
+  shouldEmitLSDA = shouldEmitPersonality &&
+    LSDAEncoding != dwarf::DW_EH_PE_omit;
 
-    // Indicate locations of general callee saved registers in frame.
-    std::vector<MachineMove> Moves;
-    TFL->getInitialFrameState(Moves);
-    Asm->EmitCFIFrameMoves(Moves);
-    Asm->EmitCFIFrameMoves(MMI->getFrameMoves());
-  }
+  if (!shouldEmitPersonality && !shouldEmitMoves)
+    return;
+
+  Asm->OutStreamer.EmitCFIStartProc(/*IsSimple=*/false);
 
-  if (!shouldEmitTable)
+  // Indicate personality routine, if any.
+  if (!shouldEmitPersonality)
     return;
 
-  const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+  const MCSymbol *Sym =
+      TLOF.getCFIPersonalitySymbol(Per, *Asm->Mang, Asm->TM, MMI);
+  Asm->OutStreamer.EmitCFIPersonality(Sym, PerEncoding);
+
+  MCSymbol *EHBegin =
+      Asm->GetTempSymbol("eh_func_begin", Asm->getFunctionNumber());
+  if (Asm->MAI->useAssignmentForEHBegin()) {
+    MCContext &Ctx = Asm->OutContext;
+    MCSymbol *CurPos = Ctx.CreateTempSymbol();
+    Asm->OutStreamer.EmitLabel(CurPos);
+    Asm->OutStreamer.EmitAssignment(EHBegin,
+                                    MCSymbolRefExpr::Create(CurPos, Ctx));
+  } else {
+    Asm->OutStreamer.EmitLabel(EHBegin);
+  }
 
   // Provide LSDA information.
-  unsigned LSDAEncoding = TLOF.getLSDAEncoding();
-  if (LSDAEncoding != dwarf::DW_EH_PE_omit)
-    Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
-                                                    Asm->getFunctionNumber()),
-                                 LSDAEncoding);
+  if (!shouldEmitLSDA)
+    return;
 
-  // Indicate personality routine, if any.
-  unsigned PerEncoding = TLOF.getPersonalityEncoding();
-  if (PerEncoding != dwarf::DW_EH_PE_omit &&
-      MMI->getPersonalities()[MMI->getPersonalityIndex()])
-    Asm->OutStreamer.EmitCFIPersonality(Asm->GetTempSymbol("personality",
-                                                    MMI->getPersonalityIndex()),
-                                        PerEncoding);
+  Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
+                                                  Asm->getFunctionNumber()),
+                               LSDAEncoding);
 }
 
-/// EndFunction - Gather and emit post-function exception information.
+/// endFunction - Gather and emit post-function exception information.
 ///
-void DwarfCFIException::EndFunction() {
-  if (!shouldEmitMoves && !shouldEmitTable) return;
+void DwarfCFIException::endFunction(const MachineFunction *) {
+  if (!shouldEmitPersonality && !shouldEmitMoves)
+    return;
 
-  if (shouldEmitMoves)
-    Asm->OutStreamer.EmitCFIEndProc();
+  Asm->OutStreamer.EmitCFIEndProc();
+
+  if (!shouldEmitPersonality)
+    return;
 
   Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
                                                 Asm->getFunctionNumber()));
@@ -133,6 +150,5 @@ void DwarfCFIException::EndFunction() {
   // Map all labels and get rid of any dead landing pads.
   MMI->TidyLandingPads();
 
-  if (shouldEmitTable)
-    EmitExceptionTable();
+  emitExceptionTable();
 }