ARMException.cpp revision 234353
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/CommandLine.h" 33#include "llvm/Support/Dwarf.h" 34#include "llvm/Support/FormattedStream.h" 35#include "llvm/ADT/SmallString.h" 36#include "llvm/ADT/StringExtras.h" 37#include "llvm/ADT/Twine.h" 38using namespace llvm; 39 40cl::opt<bool> 41EnableARMEHABIDescriptors("arm-enable-ehabi-descriptors", cl::Hidden, 42 cl::desc("Generate ARM EHABI tables with unwinding descriptors"), 43 cl::init(false)); 44 45 46ARMException::ARMException(AsmPrinter *A) 47 : DwarfException(A), 48 shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false) 49 {} 50 51ARMException::~ARMException() {} 52 53void ARMException::EndModule() { 54} 55 56/// BeginFunction - Gather pre-function exception information. Assumes it's 57/// being emitted immediately after the function entry point. 58void ARMException::BeginFunction(const MachineFunction *MF) { 59 Asm->OutStreamer.EmitFnStart(); 60 if (Asm->MF->getFunction()->needsUnwindTableEntry()) 61 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin", 62 Asm->getFunctionNumber())); 63} 64 65/// EndFunction - Gather and emit post-function exception information. 66/// 67void ARMException::EndFunction() { 68 if (!Asm->MF->getFunction()->needsUnwindTableEntry()) 69 Asm->OutStreamer.EmitCantUnwind(); 70 else { 71 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end", 72 Asm->getFunctionNumber())); 73 74 // Emit references to personality. 75 if (const Function * Personality = 76 MMI->getPersonalities()[MMI->getPersonalityIndex()]) { 77 MCSymbol *PerSym = Asm->Mang->getSymbol(Personality); 78 Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global); 79 Asm->OutStreamer.EmitPersonality(PerSym); 80 } 81 82 if (EnableARMEHABIDescriptors) { 83 // Map all labels and get rid of any dead landing pads. 84 MMI->TidyLandingPads(); 85 86 Asm->OutStreamer.EmitHandlerData(); 87 88 // Emit actual exception table 89 EmitExceptionTable(); 90 } 91 } 92 93 Asm->OutStreamer.EmitFnEnd(); 94} 95