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      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/MC/MCAsmInfo.h"
     21 #include "llvm/MC/MCContext.h"
     22 #include "llvm/MC/MCExpr.h"
     23 #include "llvm/MC/MCSection.h"
     24 #include "llvm/MC/MCStreamer.h"
     25 #include "llvm/MC/MCSymbol.h"
     26 #include "llvm/Target/Mangler.h"
     27 #include "llvm/Target/TargetData.h"
     28 #include "llvm/Target/TargetFrameLowering.h"
     29 #include "llvm/Target/TargetMachine.h"
     30 #include "llvm/Target/TargetOptions.h"
     31 #include "llvm/Target/TargetRegisterInfo.h"
     32 #include "llvm/Support/Dwarf.h"
     33 #include "llvm/Support/FormattedStream.h"
     34 #include "llvm/ADT/SmallString.h"
     35 #include "llvm/ADT/StringExtras.h"
     36 #include "llvm/ADT/Twine.h"
     37 using namespace llvm;
     38 
     39 ARMException::ARMException(AsmPrinter *A)
     40   : DwarfException(A),
     41     shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
     42     {}
     43 
     44 ARMException::~ARMException() {}
     45 
     46 void ARMException::EndModule() {
     47 }
     48 
     49 /// BeginFunction - Gather pre-function exception information. Assumes it's
     50 /// being emitted immediately after the function entry point.
     51 void ARMException::BeginFunction(const MachineFunction *MF) {
     52   Asm->OutStreamer.EmitFnStart();
     53   if (Asm->MF->getFunction()->needsUnwindTableEntry())
     54     Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
     55                                                   Asm->getFunctionNumber()));
     56 }
     57 
     58 /// EndFunction - Gather and emit post-function exception information.
     59 ///
     60 void ARMException::EndFunction() {
     61   if (!Asm->MF->getFunction()->needsUnwindTableEntry())
     62     Asm->OutStreamer.EmitCantUnwind();
     63   else {
     64     Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
     65                                                   Asm->getFunctionNumber()));
     66 
     67     // Emit references to personality.
     68     if (const Function * Personality =
     69         MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
     70       MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
     71       Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
     72       Asm->OutStreamer.EmitPersonality(PerSym);
     73     }
     74 
     75     // Map all labels and get rid of any dead landing pads.
     76     MMI->TidyLandingPads();
     77 
     78     Asm->OutStreamer.EmitHandlerData();
     79 
     80     // Emit actual exception table
     81     EmitExceptionTable();
     82   }
     83 
     84   Asm->OutStreamer.EmitFnEnd();
     85 }
     86