contrib/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp

   1 //===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI Exception Impl ----===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains support for writing DWARF exception info into asm files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "DwarfException.h"
  15 #include "llvm/Module.h"
  16 #include "llvm/CodeGen/AsmPrinter.h"
  17 #include "llvm/CodeGen/MachineModuleInfo.h"
  18 #include "llvm/CodeGen/MachineFrameInfo.h"
  19 #include "llvm/CodeGen/MachineFunction.h"
  20 #include "llvm/CodeGen/MachineLocation.h"
  21 #include "llvm/MC/MCAsmInfo.h"
  22 #include "llvm/MC/MCContext.h"
  23 #include "llvm/MC/MCExpr.h"
  24 #include "llvm/MC/MCSection.h"
  25 #include "llvm/MC/MCStreamer.h"
  26 #include "llvm/MC/MCSymbol.h"
  27 #include "llvm/Target/Mangler.h"
  28 #include "llvm/Target/TargetData.h"
  29 #include "llvm/Target/TargetFrameLowering.h"
  30 #include "llvm/Target/TargetLoweringObjectFile.h"
  31 #include "llvm/Target/TargetMachine.h"
  32 #include "llvm/Target/TargetOptions.h"
  33 #include "llvm/Target/TargetRegisterInfo.h"
  34 #include "llvm/Support/Dwarf.h"
  35 #include "llvm/Support/FormattedStream.h"
  36 #include "llvm/ADT/SmallString.h"
  37 #include "llvm/ADT/StringExtras.h"
  38 #include "llvm/ADT/Twine.h"
  39 using namespace llvm;
  40
  41 ARMException::ARMException(AsmPrinter *A)
  42   : DwarfException(A),
  43     shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
  44     {}
  45
  46 ARMException::~ARMException() {}
  47
  48 void ARMException::EndModule() {
  49 }
  50
  51 /// BeginFunction - Gather pre-function exception information. Assumes it's
  52 /// being emitted immediately after the function entry point.
  53 void ARMException::BeginFunction(const MachineFunction *MF) {
  54   Asm->OutStreamer.EmitFnStart();
  55   if (Asm->MF->getFunction()->needsUnwindTableEntry())
  56     Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
  57                                                   Asm->getFunctionNumber()));
  58 }
  59
  60 /// EndFunction - Gather and emit post-function exception information.
  61 ///
  62 void ARMException::EndFunction() {
  63   if (!Asm->MF->getFunction()->needsUnwindTableEntry())
  64     Asm->OutStreamer.EmitCantUnwind();
  65   else {
  66     Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
  67                                                   Asm->getFunctionNumber()));
  68
  69     // Emit references to personality.
  70     if (const Function * Personality =
  71         MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
  72       MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
  73       Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
  74       Asm->OutStreamer.EmitPersonality(PerSym);
  75     }
  76
  77     // Map all labels and get rid of any dead landing pads.
  78     MMI->TidyLandingPads();
  79
  80     Asm->OutStreamer.EmitHandlerData();
  81
  82     // Emit actual exception table
  83     EmitExceptionTable();
  84   }
  85
  86   Asm->OutStreamer.EmitFnEnd();
  87 }