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