DwarfException.cpp revision ec0445855179d2c9fb98a2c8a42e03525762f45f
1eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling//===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===// 2eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling// 3eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling// The LLVM Compiler Infrastructure 4eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling// 5eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling// This file is distributed under the University of Illinois Open Source 6eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling// License. See LICENSE.TXT for details. 7eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling// 8eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling//===----------------------------------------------------------------------===// 9eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling// 1028275fdf02885587156da5cb20388b22d5b96557Bill Wendling// This file contains support for writing DWARF exception info into asm files. 11eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling// 12eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling//===----------------------------------------------------------------------===// 13eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 14eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "DwarfException.h" 15eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/Module.h" 16eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/CodeGen/MachineModuleInfo.h" 17eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/CodeGen/MachineFrameInfo.h" 18fc4da0cea8a0f6c9c1483b92c2dffda217c0ba24David Greene#include "llvm/CodeGen/MachineFunction.h" 19eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/CodeGen/MachineLocation.h" 208c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner#include "llvm/MC/MCAsmInfo.h" 218c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner#include "llvm/MC/MCContext.h" 228c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner#include "llvm/MC/MCExpr.h" 2343e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling#include "llvm/MC/MCSection.h" 246c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner#include "llvm/MC/MCStreamer.h" 25eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/Target/TargetData.h" 26eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/Target/TargetFrameInfo.h" 27d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner#include "llvm/Target/TargetLoweringObjectFile.h" 28eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/Target/TargetOptions.h" 29d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner#include "llvm/Target/TargetRegisterInfo.h" 306c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner#include "llvm/Support/Dwarf.h" 313fb2b1ede30193b59a651328a946174196b20610Jim Grosbach#include "llvm/Support/Mangler.h" 326c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner#include "llvm/Support/Timer.h" 336c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner#include "llvm/Support/raw_ostream.h" 34c40d9f9bae70c83947bf8fa5f9ee97adbf1bb0c0Jim Grosbach#include "llvm/ADT/SmallString.h" 35eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/ADT/StringExtras.h" 36eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingusing namespace llvm; 37eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 38eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingstatic TimerGroup &getDwarfTimerGroup() { 3928275fdf02885587156da5cb20388b22d5b96557Bill Wendling static TimerGroup DwarfTimerGroup("DWARF Exception"); 40eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return DwarfTimerGroup; 41eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 42eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 43bc0d23afae781c45f92865c1c27bed0ce51fe545Bill WendlingDwarfException::DwarfException(raw_ostream &OS, AsmPrinter *A, 44af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner const MCAsmInfo *T) 45bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling : Dwarf(OS, A, T, "eh"), shouldEmitTable(false), shouldEmitMoves(false), 46bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling shouldEmitTableModule(false), shouldEmitMovesModule(false), 47bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling ExceptionTimer(0) { 48dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher if (TimePassesIsEnabled) 4928275fdf02885587156da5cb20388b22d5b96557Bill Wendling ExceptionTimer = new Timer("DWARF Exception Writer", 50bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling getDwarfTimerGroup()); 51bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling} 52bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling 53bc0d23afae781c45f92865c1c27bed0ce51fe545Bill WendlingDwarfException::~DwarfException() { 54bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling delete ExceptionTimer; 55bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling} 56bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling 57bb3e29932d14cc012149a1ab452b88e6f6f5bb49Bill Wendling/// SizeOfEncodedValue - Return the size of the encoding in bytes. 5852783c63a13d384582997684384553e6545852d3Bill Wendlingunsigned DwarfException::SizeOfEncodedValue(unsigned Encoding) { 5952783c63a13d384582997684384553e6545852d3Bill Wendling if (Encoding == dwarf::DW_EH_PE_omit) 6052783c63a13d384582997684384553e6545852d3Bill Wendling return 0; 6152783c63a13d384582997684384553e6545852d3Bill Wendling 6252783c63a13d384582997684384553e6545852d3Bill Wendling switch (Encoding & 0x07) { 6352783c63a13d384582997684384553e6545852d3Bill Wendling case dwarf::DW_EH_PE_absptr: 6452783c63a13d384582997684384553e6545852d3Bill Wendling return TD->getPointerSize(); 6552783c63a13d384582997684384553e6545852d3Bill Wendling case dwarf::DW_EH_PE_udata2: 6652783c63a13d384582997684384553e6545852d3Bill Wendling return 2; 6752783c63a13d384582997684384553e6545852d3Bill Wendling case dwarf::DW_EH_PE_udata4: 6852783c63a13d384582997684384553e6545852d3Bill Wendling return 4; 6952783c63a13d384582997684384553e6545852d3Bill Wendling case dwarf::DW_EH_PE_udata8: 7052783c63a13d384582997684384553e6545852d3Bill Wendling return 8; 7152783c63a13d384582997684384553e6545852d3Bill Wendling } 7252783c63a13d384582997684384553e6545852d3Bill Wendling 7328275fdf02885587156da5cb20388b22d5b96557Bill Wendling assert(0 && "Invalid encoded value."); 7452783c63a13d384582997684384553e6545852d3Bill Wendling return 0; 7552783c63a13d384582997684384553e6545852d3Bill Wendling} 7652783c63a13d384582997684384553e6545852d3Bill Wendling 777378b1bd00033d8be64d388d60a562027cbf953aBill Wendling/// CreateLabelDiff - Emit a label and subtract it from the expression we 787378b1bd00033d8be64d388d60a562027cbf953aBill Wendling/// already have. This is equivalent to emitting "foo - .", but we have to emit 797378b1bd00033d8be64d388d60a562027cbf953aBill Wendling/// the label for "." directly. 807378b1bd00033d8be64d388d60a562027cbf953aBill Wendlingconst MCExpr *DwarfException::CreateLabelDiff(const MCExpr *ExprRef, 817378b1bd00033d8be64d388d60a562027cbf953aBill Wendling const char *LabelName, 827378b1bd00033d8be64d388d60a562027cbf953aBill Wendling unsigned Index) { 837378b1bd00033d8be64d388d60a562027cbf953aBill Wendling SmallString<64> Name; 847378b1bd00033d8be64d388d60a562027cbf953aBill Wendling raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() 857378b1bd00033d8be64d388d60a562027cbf953aBill Wendling << LabelName << Asm->getFunctionNumber() 867378b1bd00033d8be64d388d60a562027cbf953aBill Wendling << "_" << Index; 877378b1bd00033d8be64d388d60a562027cbf953aBill Wendling MCSymbol *DotSym = Asm->OutContext.GetOrCreateSymbol(Name.str()); 887378b1bd00033d8be64d388d60a562027cbf953aBill Wendling Asm->OutStreamer.EmitLabel(DotSym); 897378b1bd00033d8be64d388d60a562027cbf953aBill Wendling 907378b1bd00033d8be64d388d60a562027cbf953aBill Wendling return MCBinaryExpr::CreateSub(ExprRef, 917378b1bd00033d8be64d388d60a562027cbf953aBill Wendling MCSymbolRefExpr::Create(DotSym, 927378b1bd00033d8be64d388d60a562027cbf953aBill Wendling Asm->OutContext), 937378b1bd00033d8be64d388d60a562027cbf953aBill Wendling Asm->OutContext); 947378b1bd00033d8be64d388d60a562027cbf953aBill Wendling} 957378b1bd00033d8be64d388d60a562027cbf953aBill Wendling 967ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendling/// EmitCIE - Emit a Common Information Entry (CIE). This holds information that 977ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendling/// is shared among many Frame Description Entries. There is at least one CIE 987ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendling/// in every non-empty .debug_frame section. 998c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattnervoid DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) { 100eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Size and sign of stack growth. 101eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int stackGrowth = 102eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->TM.getFrameInfo()->getStackGrowthDirection() == 103eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling TargetFrameInfo::StackGrowsUp ? 104eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling TD->getPointerSize() : -TD->getPointerSize(); 105eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1068c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering(); 1078c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner 108eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Begin eh frame section. 1098c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection()); 110eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 11133adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner if (MAI->is_EHSymbolPrivate()) 11233adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner O << MAI->getPrivateGlobalPrefix(); 113eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling O << "EH_frame" << Index << ":\n"; 1148c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner 115eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("section_eh_frame", Index); 116eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 117eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Define base labels. 118eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_common", Index); 119eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 120eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Define the eh frame length. 121eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitDifference("eh_frame_common_end", Index, 122eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling "eh_frame_common_begin", Index, true); 123eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Length of Common Information Entry"); 124eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 125eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // EH frame header. 126eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_common_begin", Index); 127eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitInt32((int)0); 128eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Identifier Tag"); 129eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitInt8(dwarf::DW_CIE_VERSION); 130eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Version"); 131eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 132eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // The personality presence indicates that language specific information will 1338c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner // show up in the eh frame. Find out how we are supposed to lower the 1348c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner // personality function reference: 1358c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner const MCExpr *PersonalityRef = 0; 1368c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner bool IsPersonalityIndirect = false, IsPersonalityPCRel = false; 1378c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner if (PersonalityFn) { 1388c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner // FIXME: HANDLE STATIC CODEGEN MODEL HERE. 1398c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner 1408c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner // In non-static mode, ask the object file how to represent this reference. 1418c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner PersonalityRef = 1428c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner TLOF.getSymbolForDwarfGlobalReference(PersonalityFn, Asm->Mang, 1438609c7c931c0213d6d29f665df2110cf3c709e4cChris Lattner Asm->MMI, 1448c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner IsPersonalityIndirect, 1458c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner IsPersonalityPCRel); 1468c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner } 1478c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner 14852783c63a13d384582997684384553e6545852d3Bill Wendling unsigned PerEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 1498c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner if (IsPersonalityIndirect) 15052783c63a13d384582997684384553e6545852d3Bill Wendling PerEncoding |= dwarf::DW_EH_PE_indirect; 15152783c63a13d384582997684384553e6545852d3Bill Wendling unsigned LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 15252783c63a13d384582997684384553e6545852d3Bill Wendling unsigned FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 15352783c63a13d384582997684384553e6545852d3Bill Wendling 15452783c63a13d384582997684384553e6545852d3Bill Wendling char Augmentation[5] = { 0 }; 15552783c63a13d384582997684384553e6545852d3Bill Wendling unsigned AugmentationSize = 0; 15652783c63a13d384582997684384553e6545852d3Bill Wendling char *APtr = Augmentation + 1; 15752783c63a13d384582997684384553e6545852d3Bill Wendling 1588c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner if (PersonalityRef) { 15952783c63a13d384582997684384553e6545852d3Bill Wendling // There is a personality function. 16052783c63a13d384582997684384553e6545852d3Bill Wendling *APtr++ = 'P'; 16152783c63a13d384582997684384553e6545852d3Bill Wendling AugmentationSize += 1 + SizeOfEncodedValue(PerEncoding); 16252783c63a13d384582997684384553e6545852d3Bill Wendling } 16352783c63a13d384582997684384553e6545852d3Bill Wendling 16452783c63a13d384582997684384553e6545852d3Bill Wendling if (UsesLSDA[Index]) { 16552783c63a13d384582997684384553e6545852d3Bill Wendling // An LSDA pointer is in the FDE augmentation. 16652783c63a13d384582997684384553e6545852d3Bill Wendling *APtr++ = 'L'; 16752783c63a13d384582997684384553e6545852d3Bill Wendling ++AugmentationSize; 16852783c63a13d384582997684384553e6545852d3Bill Wendling } 16952783c63a13d384582997684384553e6545852d3Bill Wendling 17052783c63a13d384582997684384553e6545852d3Bill Wendling if (FDEEncoding != dwarf::DW_EH_PE_absptr) { 17152783c63a13d384582997684384553e6545852d3Bill Wendling // A non-default pointer encoding for the FDE. 17252783c63a13d384582997684384553e6545852d3Bill Wendling *APtr++ = 'R'; 17352783c63a13d384582997684384553e6545852d3Bill Wendling ++AugmentationSize; 17452783c63a13d384582997684384553e6545852d3Bill Wendling } 17552783c63a13d384582997684384553e6545852d3Bill Wendling 17652783c63a13d384582997684384553e6545852d3Bill Wendling if (APtr != Augmentation + 1) 17752783c63a13d384582997684384553e6545852d3Bill Wendling Augmentation[0] = 'z'; 17852783c63a13d384582997684384553e6545852d3Bill Wendling 17952783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitString(Augmentation); 180eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Augmentation"); 181eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 182eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Round out reader. 183eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitULEB128Bytes(1); 184eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Code Alignment Factor"); 185eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitSLEB128Bytes(stackGrowth); 186eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Data Alignment Factor"); 187eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true)); 188eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Return Address Column"); 189eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 19052783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitULEB128Bytes(AugmentationSize); 19152783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EOL("Augmentation Size"); 19252783c63a13d384582997684384553e6545852d3Bill Wendling 19352783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitInt8(PerEncoding); 19452783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EOL("Personality", PerEncoding); 19552783c63a13d384582997684384553e6545852d3Bill Wendling 1964bda11fbdafc1d4fa97b7539bdf5a0f62ecfc280Bill Wendling // If there is a personality, we need to indicate the function's location. 1978c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner if (PersonalityRef) { 1987378b1bd00033d8be64d388d60a562027cbf953aBill Wendling if (!IsPersonalityPCRel) 1997378b1bd00033d8be64d388d60a562027cbf953aBill Wendling PersonalityRef = CreateLabelDiff(PersonalityRef, "personalityref_addr", 2007378b1bd00033d8be64d388d60a562027cbf953aBill Wendling Index); 2017378b1bd00033d8be64d388d60a562027cbf953aBill Wendling 2028c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner O << MAI->getData32bitsDirective(); 2038c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner PersonalityRef->print(O, MAI); 204eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Personality"); 205eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 20652783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitInt8(LSDAEncoding); 20752783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EOL("LSDA Encoding", LSDAEncoding); 208eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 20952783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitInt8(FDEEncoding); 21052783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EOL("FDE Encoding", FDEEncoding); 211eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 212eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 213eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Indicate locations of general callee saved registers in frame. 214eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling std::vector<MachineMove> Moves; 215eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling RI->getInitialFrameState(Moves); 216eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitFrameMoves(NULL, 0, Moves, true); 217eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 218eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // On Darwin the linker honors the alignment of eh_frame, which means it must 219eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // be 8-byte on 64-bit targets to match what gcc does. Otherwise you get 220eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // holes which confuse readers of eh_frame. 2218c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner Asm->EmitAlignment(TD->getPointerSize() == 4 ? 2 : 3, 0, 0, false); 222eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_common_end", Index); 223eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 224eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL(); 225eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 226eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 2277ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendling/// EmitFDE - Emit the Frame Description Entry (FDE) for the function. 2287ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendlingvoid DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) { 229dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher assert(!EHFrameInfo.function->hasAvailableExternallyLinkage() && 230eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling "Should not emit 'available externally' functions at all"); 231eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 2323e0f60be46cb5363d4375f26a5e27d1dcd9867fbChris Lattner const Function *TheFunc = EHFrameInfo.function; 233dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher 2346c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getEHFrameSection()); 235dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher 236eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Externally visible entry into the functions eh frame info. If the 237eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // corresponding function is static, this should not be externally visible. 2383e0f60be46cb5363d4375f26a5e27d1dcd9867fbChris Lattner if (!TheFunc->hasLocalLinkage()) 23933adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner if (const char *GlobalEHDirective = MAI->getGlobalEHDirective()) 240ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling O << GlobalEHDirective << EHFrameInfo.FnName << '\n'; 241eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 242eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If corresponding function is weak definition, this should be too. 24333adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner if (TheFunc->isWeakForLinker() && MAI->getWeakDefDirective()) 244ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling O << MAI->getWeakDefDirective() << EHFrameInfo.FnName << '\n'; 245ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling 246ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling // If corresponding function is hidden, this should be too. 247ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling if (TheFunc->hasHiddenVisibility()) 248ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling if (const char *HiddenDirective = MAI->getHiddenDirective()) 249ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling O << HiddenDirective << EHFrameInfo.FnName << '\n' ; 250eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 251eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If there are no calls then you can't unwind. This may mean we can omit the 252eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // EH Frame, but some environments do not handle weak absolute symbols. If 253eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // UnwindTablesMandatory is set we cannot do this optimization; the unwind 254eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // info is to be available for non-EH uses. 2553e0f60be46cb5363d4375f26a5e27d1dcd9867fbChris Lattner if (!EHFrameInfo.hasCalls && !UnwindTablesMandatory && 2563e0f60be46cb5363d4375f26a5e27d1dcd9867fbChris Lattner (!TheFunc->isWeakForLinker() || 25733adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner !MAI->getWeakDefDirective() || 25833adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner MAI->getSupportsWeakOmittedEHFrame())) { 259eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling O << EHFrameInfo.FnName << " = 0\n"; 260eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // This name has no connection to the function, so it might get 261eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // dead-stripped when the function is not, erroneously. Prohibit 262eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // dead-stripping unconditionally. 26333adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner if (const char *UsedDirective = MAI->getUsedDirective()) 264eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling O << UsedDirective << EHFrameInfo.FnName << "\n\n"; 265eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } else { 266eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling O << EHFrameInfo.FnName << ":\n"; 267eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 268eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // EH frame header. 269eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitDifference("eh_frame_end", EHFrameInfo.Number, 270eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling "eh_frame_begin", EHFrameInfo.Number, true); 271eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Length of Frame Information Entry"); 272eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 273eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_begin", EHFrameInfo.Number); 274eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 275a4ff5e48fc6a4718d3a2af8654cfc06a17310aedChris Lattner EmitSectionOffset("eh_frame_begin", "eh_frame_common", 276a4ff5e48fc6a4718d3a2af8654cfc06a17310aedChris Lattner EHFrameInfo.Number, EHFrameInfo.PersonalityIndex, 277a4ff5e48fc6a4718d3a2af8654cfc06a17310aedChris Lattner true, true, false); 278eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 279eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("FDE CIE offset"); 280eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 281c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands EmitReference("eh_func_begin", EHFrameInfo.Number, true, true); 282eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("FDE initial location"); 283eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitDifference("eh_func_end", EHFrameInfo.Number, 284c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands "eh_func_begin", EHFrameInfo.Number, true); 285eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("FDE address range"); 286eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 287eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If there is a personality and landing pads then point to the language 288eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // specific data area in the exception table. 289d44fff7849034fc17d6a0e9f9926542865bb7881Eric Christopher if (MMI->getPersonalities()[0] != NULL) { 290c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands bool is4Byte = TD->getPointerSize() == sizeof(int32_t); 291c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands 2926fefcebc4f92b944664b7b26042bc21e57aefe43Eric Christopher Asm->EmitULEB128Bytes(is4Byte ? 4 : 8); 293eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Augmentation size"); 294eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 295c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands if (EHFrameInfo.hasLandingPads) 2966fefcebc4f92b944664b7b26042bc21e57aefe43Eric Christopher EmitReference("exception", EHFrameInfo.Number, true, false); 297c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands else { 29852783c63a13d384582997684384553e6545852d3Bill Wendling if (is4Byte) 29952783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitInt32((int)0); 30052783c63a13d384582997684384553e6545852d3Bill Wendling else 30152783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitInt64((int)0); 3026fefcebc4f92b944664b7b26042bc21e57aefe43Eric Christopher } 303eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Language Specific Data Area"); 304eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } else { 305eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitULEB128Bytes(0); 306eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Augmentation size"); 307eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 308eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 309eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Indicate locations of function specific callee saved registers in frame. 310dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves, 311eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling true); 312eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 313eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // On Darwin the linker honors the alignment of eh_frame, which means it 314eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // must be 8-byte on 64-bit targets to match what gcc does. Otherwise you 315eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // get holes which confuse readers of eh_frame. 316eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3, 317eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 0, 0, false); 318eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_end", EHFrameInfo.Number); 319eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 320eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If the function is marked used, this table should be also. We cannot 321eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // make the mark unconditional in this case, since retaining the table also 322eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // retains the function in this case, and there is code around that depends 323eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // on unused functions (calling undefined externals) being dead-stripped to 324eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // link correctly. Yes, there really is. 325401e10c4fbfcdcfade5065093e2ca97f69a1d144Chris Lattner if (MMI->isUsedFunction(EHFrameInfo.function)) 32633adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner if (const char *UsedDirective = MAI->getUsedDirective()) 327eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling O << UsedDirective << EHFrameInfo.FnName << "\n\n"; 328eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 3294bda11fbdafc1d4fa97b7539bdf5a0f62ecfc280Bill Wendling 3304bda11fbdafc1d4fa97b7539bdf5a0f62ecfc280Bill Wendling Asm->EOL(); 331eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 332eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 333eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// SharedTypeIds - How many leading type ids two landing pads have in common. 334eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingunsigned DwarfException::SharedTypeIds(const LandingPadInfo *L, 335eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling const LandingPadInfo *R) { 336eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds; 337eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned LSize = LIds.size(), RSize = RIds.size(); 338eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned MinSize = LSize < RSize ? LSize : RSize; 339eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned Count = 0; 340eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 341eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (; Count != MinSize; ++Count) 342eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (LIds[Count] != RIds[Count]) 343eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return Count; 344eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 345eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return Count; 346eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 347eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 348eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// PadLT - Order landing pads lexicographically by type id. 349eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingbool DwarfException::PadLT(const LandingPadInfo *L, const LandingPadInfo *R) { 350eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds; 351eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned LSize = LIds.size(), RSize = RIds.size(); 352eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned MinSize = LSize < RSize ? LSize : RSize; 353eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 354eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (unsigned i = 0; i != MinSize; ++i) 355eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (LIds[i] != RIds[i]) 356eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return LIds[i] < RIds[i]; 357eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 358eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return LSize < RSize; 359eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 360eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 361d4609622ade8d0ebaf57fd70700c2fedf0b3d165Bill Wendling/// ComputeActionsTable - Compute the actions table and gather the first action 362d4609622ade8d0ebaf57fd70700c2fedf0b3d165Bill Wendling/// index for each landing pad site. 363ade025c65c12503aba161a4fa399fd97414abaffBill Wendlingunsigned DwarfException:: 364ade025c65c12503aba161a4fa399fd97414abaffBill WendlingComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*> &LandingPads, 365ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVectorImpl<ActionEntry> &Actions, 366ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVectorImpl<unsigned> &FirstActions) { 367a583c55864e83e470333b7be878280b10e175a6eBill Wendling 368a583c55864e83e470333b7be878280b10e175a6eBill Wendling // The action table follows the call-site table in the LSDA. The individual 369a583c55864e83e470333b7be878280b10e175a6eBill Wendling // records are of two types: 370a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 371a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * Catch clause 372a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * Exception specification 373a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 374a583c55864e83e470333b7be878280b10e175a6eBill Wendling // The two record kinds have the same format, with only small differences. 375a583c55864e83e470333b7be878280b10e175a6eBill Wendling // They are distinguished by the "switch value" field: Catch clauses 376a583c55864e83e470333b7be878280b10e175a6eBill Wendling // (TypeInfos) have strictly positive switch values, and exception 377a583c55864e83e470333b7be878280b10e175a6eBill Wendling // specifications (FilterIds) have strictly negative switch values. Value 0 378a583c55864e83e470333b7be878280b10e175a6eBill Wendling // indicates a catch-all clause. 379a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 3805e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // Negative type IDs index into FilterIds. Positive type IDs index into 3815e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // TypeInfos. The value written for a positive type ID is just the type ID 3825e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // itself. For a negative type ID, however, the value written is the 383eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // (negative) byte offset of the corresponding FilterIds entry. The byte 3845e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // offset is usually equal to the type ID (because the FilterIds entries are 3855e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // written using a variable width encoding, which outputs one byte per entry 3865e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // as long as the value written is not too large) but can differ. This kind 3875e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // of complication does not occur for positive type IDs because type infos are 388eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // output using a fixed width encoding. FilterOffsets[i] holds the byte 389eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // offset corresponding to FilterIds[i]. 390409914b773ffd53d53d214394d5636a76f673186Bill Wendling 391409914b773ffd53d53d214394d5636a76f673186Bill Wendling const std::vector<unsigned> &FilterIds = MMI->getFilterIds(); 392eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SmallVector<int, 16> FilterOffsets; 393eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FilterOffsets.reserve(FilterIds.size()); 394eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int Offset = -1; 395409914b773ffd53d53d214394d5636a76f673186Bill Wendling 396409914b773ffd53d53d214394d5636a76f673186Bill Wendling for (std::vector<unsigned>::const_iterator 397409914b773ffd53d53d214394d5636a76f673186Bill Wendling I = FilterIds.begin(), E = FilterIds.end(); I != E; ++I) { 398eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FilterOffsets.push_back(Offset); 399af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner Offset -= MCAsmInfo::getULEB128Size(*I); 400eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 401eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 402eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FirstActions.reserve(LandingPads.size()); 403eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 404eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int FirstAction = 0; 405eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned SizeActions = 0; 4065e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const LandingPadInfo *PrevLPI = 0; 407409914b773ffd53d53d214394d5636a76f673186Bill Wendling 4085cff487665097d971067cbede1598e249f673182Bill Wendling for (SmallVectorImpl<const LandingPadInfo *>::const_iterator 4095e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling I = LandingPads.begin(), E = LandingPads.end(); I != E; ++I) { 4105e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const LandingPadInfo *LPI = *I; 4115e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const std::vector<int> &TypeIds = LPI->TypeIds; 4125e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const unsigned NumShared = PrevLPI ? SharedTypeIds(LPI, PrevLPI) : 0; 413eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned SizeSiteActions = 0; 414eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 415eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (NumShared < TypeIds.size()) { 416eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned SizeAction = 0; 417eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ActionEntry *PrevAction = 0; 418eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 419eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (NumShared) { 4205e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const unsigned SizePrevIds = PrevLPI->TypeIds.size(); 421eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling assert(Actions.size()); 422eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PrevAction = &Actions.back(); 423af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner SizeAction = MCAsmInfo::getSLEB128Size(PrevAction->NextAction) + 424af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID); 425eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 426eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (unsigned j = NumShared; j != SizePrevIds; ++j) { 427eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SizeAction -= 428af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID); 429eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SizeAction += -PrevAction->NextAction; 430eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PrevAction = PrevAction->Previous; 431eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 432eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 433eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 434eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Compute the actions. 4355e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling for (unsigned J = NumShared, M = TypeIds.size(); J != M; ++J) { 4365e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling int TypeID = TypeIds[J]; 4375e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling assert(-1 - TypeID < (int)FilterOffsets.size() && "Unknown filter id!"); 438eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID; 439af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner unsigned SizeTypeID = MCAsmInfo::getSLEB128Size(ValueForTypeID); 440eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 441eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0; 442af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner SizeAction = SizeTypeID + MCAsmInfo::getSLEB128Size(NextAction); 443eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SizeSiteActions += SizeAction; 444eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 445a583c55864e83e470333b7be878280b10e175a6eBill Wendling ActionEntry Action = { ValueForTypeID, NextAction, PrevAction }; 446eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Actions.push_back(Action); 447eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PrevAction = &Actions.back(); 448eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 449eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 450eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Record the first action of the landing pad site. 451eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FirstAction = SizeActions + SizeSiteActions - SizeAction + 1; 452eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } // else identical - re-use previous FirstAction 453eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 454a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Information used when created the call-site table. The action record 455a583c55864e83e470333b7be878280b10e175a6eBill Wendling // field of the call site record is the offset of the first associated 456a583c55864e83e470333b7be878280b10e175a6eBill Wendling // action record, relative to the start of the actions table. This value is 457a583c55864e83e470333b7be878280b10e175a6eBill Wendling // biased by 1 (1 in dicating the start of the actions table), and 0 458a583c55864e83e470333b7be878280b10e175a6eBill Wendling // indicates that there are no actions. 459eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FirstActions.push_back(FirstAction); 460eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 461eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Compute this sites contribution to size. 462eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SizeActions += SizeSiteActions; 4635e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling 4645e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling PrevLPI = LPI; 465eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 466eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 4675e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling return SizeActions; 4685e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling} 4695e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling 470ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling/// CallToNoUnwindFunction - Return `true' if this is a call to a function 471ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling/// marked `nounwind'. Return `false' otherwise. 472ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendlingbool DwarfException::CallToNoUnwindFunction(const MachineInstr *MI) { 473ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling assert(MI->getDesc().isCall() && "This should be a call instruction!"); 474ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 475ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling bool MarkedNoUnwind = false; 476ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling bool SawFunc = false; 477ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 478ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) { 479ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling const MachineOperand &MO = MI->getOperand(I); 480ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 481ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling if (MO.isGlobal()) { 482ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling if (Function *F = dyn_cast<Function>(MO.getGlobal())) { 483ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling if (SawFunc) { 484ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // Be conservative. If we have more than one function operand for this 485ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // call, then we can't make the assumption that it's the callee and 486ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // not a parameter to the call. 487ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // 488ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // FIXME: Determine if there's a way to say that `F' is the callee or 489ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // parameter. 490ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling MarkedNoUnwind = false; 491ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling break; 492ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling } 493ecc260e403d09ba04ed87d2d04226ac851c68e5aBill Wendling 494ecc260e403d09ba04ed87d2d04226ac851c68e5aBill Wendling MarkedNoUnwind = F->doesNotThrow(); 495ecc260e403d09ba04ed87d2d04226ac851c68e5aBill Wendling SawFunc = true; 496ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling } 497ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling } 498ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling } 499ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 500ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling return MarkedNoUnwind; 501ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling} 502ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 503ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// ComputeCallSiteTable - Compute the call-site table. The entry for an invoke 504a583c55864e83e470333b7be878280b10e175a6eBill Wendling/// has a try-range containing the call, a non-zero landing pad, and an 505ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// appropriate action. The entry for an ordinary call has a try-range 506ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// containing the call and zero for the landing pad and the action. Calls 507ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// marked 'nounwind' have no entry and must not be contained in the try-range 508ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// of any entry - they form gaps in the table. Entries must be ordered by 509ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// try-range address. 510ade025c65c12503aba161a4fa399fd97414abaffBill Wendlingvoid DwarfException:: 511ade025c65c12503aba161a4fa399fd97414abaffBill WendlingComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites, 512ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const RangeMapType &PadMap, 513ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const SmallVectorImpl<const LandingPadInfo *> &LandingPads, 514ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const SmallVectorImpl<unsigned> &FirstActions) { 515eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // The end label of the previous invoke or nounwind try-range. 516eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned LastLabel = 0; 517eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 518eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Whether there is a potentially throwing instruction (currently this means 519eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // an ordinary call) between the end of the previous try-range and now. 520eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling bool SawPotentiallyThrowing = false; 521eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 5225cff487665097d971067cbede1598e249f673182Bill Wendling // Whether the last CallSite entry was for an invoke. 523eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling bool PreviousIsInvoke = false; 524eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 525eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Visit all instructions in order of address. 526eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 527eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling I != E; ++I) { 528eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end(); 529eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling MI != E; ++MI) { 530eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (!MI->isLabel()) { 531ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling if (MI->getDesc().isCall()) 532ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling SawPotentiallyThrowing |= !CallToNoUnwindFunction(MI); 53373b55510585573cd37fca85864c8d7d73e6b4093Bill Wendling 534eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling continue; 535eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 536eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 537eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned BeginLabel = MI->getOperand(0).getImm(); 538eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling assert(BeginLabel && "Invalid label!"); 539eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 540eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // End of the previous try-range? 541eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (BeginLabel == LastLabel) 542eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SawPotentiallyThrowing = false; 543eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 544eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Beginning of a new try-range? 54581cf4325698b48b02eddab921ac333c7f25005c3Jeffrey Yasskin RangeMapType::const_iterator L = PadMap.find(BeginLabel); 546eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (L == PadMap.end()) 547eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Nope, it was just some random label. 548eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling continue; 549eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 550a583c55864e83e470333b7be878280b10e175a6eBill Wendling const PadRange &P = L->second; 551eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling const LandingPadInfo *LandingPad = LandingPads[P.PadIndex]; 552eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] && 553eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling "Inconsistent landing pad map!"); 554eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 555a583c55864e83e470333b7be878280b10e175a6eBill Wendling // For Dwarf exception handling (SjLj handling doesn't use this). If some 556a583c55864e83e470333b7be878280b10e175a6eBill Wendling // instruction between the previous try-range and this one may throw, 557a583c55864e83e470333b7be878280b10e175a6eBill Wendling // create a call-site entry with no landing pad for the region between the 558a583c55864e83e470333b7be878280b10e175a6eBill Wendling // try-ranges. 5591b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (SawPotentiallyThrowing && 56033adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) { 561a583c55864e83e470333b7be878280b10e175a6eBill Wendling CallSiteEntry Site = { LastLabel, BeginLabel, 0, 0 }; 562eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling CallSites.push_back(Site); 563eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PreviousIsInvoke = false; 564eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 565eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 566eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling LastLabel = LandingPad->EndLabels[P.RangeIndex]; 567eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling assert(BeginLabel && LastLabel && "Invalid landing pad!"); 568eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 569eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (LandingPad->LandingPadLabel) { 570eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // This try-range is for an invoke. 571a583c55864e83e470333b7be878280b10e175a6eBill Wendling CallSiteEntry Site = { 572a583c55864e83e470333b7be878280b10e175a6eBill Wendling BeginLabel, 573a583c55864e83e470333b7be878280b10e175a6eBill Wendling LastLabel, 574a583c55864e83e470333b7be878280b10e175a6eBill Wendling LandingPad->LandingPadLabel, 575a583c55864e83e470333b7be878280b10e175a6eBill Wendling FirstActions[P.PadIndex] 576a583c55864e83e470333b7be878280b10e175a6eBill Wendling }; 577eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 57833668c0f1a7e374d4c3c53df34efbdf570e0987bJim Grosbach // Try to merge with the previous call-site. SJLJ doesn't do this 57933668c0f1a7e374d4c3c53df34efbdf570e0987bJim Grosbach if (PreviousIsInvoke && 58033668c0f1a7e374d4c3c53df34efbdf570e0987bJim Grosbach MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) { 581eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling CallSiteEntry &Prev = CallSites.back(); 582eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) { 583eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Extend the range of the previous entry. 584eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Prev.EndLabel = Site.EndLabel; 585eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling continue; 586eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 587eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 588eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 589eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Otherwise, create a new call-site. 590eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling CallSites.push_back(Site); 591eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PreviousIsInvoke = true; 592eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } else { 593eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Create a gap. 594eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PreviousIsInvoke = false; 595eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 596eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 597eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 598eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 599eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If some instruction between the previous try-range and the end of the 600eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // function may throw, create a call-site entry with no landing pad for the 601eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // region following the try-range. 6021b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (SawPotentiallyThrowing && 60333adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) { 604a583c55864e83e470333b7be878280b10e175a6eBill Wendling CallSiteEntry Site = { LastLabel, 0, 0, 0 }; 605eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling CallSites.push_back(Site); 606eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 607ade025c65c12503aba161a4fa399fd97414abaffBill Wendling} 608ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 6090dafca90761097230f02e655fdd541f59b888315Bill Wendling/// EmitExceptionTable - Emit landing pads and actions. 6100dafca90761097230f02e655fdd541f59b888315Bill Wendling/// 6110dafca90761097230f02e655fdd541f59b888315Bill Wendling/// The general organization of the table is complex, but the basic concepts are 6120dafca90761097230f02e655fdd541f59b888315Bill Wendling/// easy. First there is a header which describes the location and organization 6130dafca90761097230f02e655fdd541f59b888315Bill Wendling/// of the three components that follow. 614dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher/// 6150dafca90761097230f02e655fdd541f59b888315Bill Wendling/// 1. The landing pad site information describes the range of code covered by 6160dafca90761097230f02e655fdd541f59b888315Bill Wendling/// the try. In our case it's an accumulation of the ranges covered by the 6170dafca90761097230f02e655fdd541f59b888315Bill Wendling/// invokes in the try. There is also a reference to the landing pad that 6180dafca90761097230f02e655fdd541f59b888315Bill Wendling/// handles the exception once processed. Finally an index into the actions 6190dafca90761097230f02e655fdd541f59b888315Bill Wendling/// table. 620a583c55864e83e470333b7be878280b10e175a6eBill Wendling/// 2. The action table, in our case, is composed of pairs of type IDs and next 6210dafca90761097230f02e655fdd541f59b888315Bill Wendling/// action offset. Starting with the action index from the landing pad 622a583c55864e83e470333b7be878280b10e175a6eBill Wendling/// site, each type ID is checked for a match to the current exception. If 6230dafca90761097230f02e655fdd541f59b888315Bill Wendling/// it matches then the exception and type id are passed on to the landing 6240dafca90761097230f02e655fdd541f59b888315Bill Wendling/// pad. Otherwise the next action is looked up. This chain is terminated 62528275fdf02885587156da5cb20388b22d5b96557Bill Wendling/// with a next action of zero. If no type id is found then the frame is 6260dafca90761097230f02e655fdd541f59b888315Bill Wendling/// unwound and handling continues. 627a583c55864e83e470333b7be878280b10e175a6eBill Wendling/// 3. Type ID table contains references to all the C++ typeinfo for all 62828275fdf02885587156da5cb20388b22d5b96557Bill Wendling/// catches in the function. This tables is reverse indexed base 1. 629ade025c65c12503aba161a4fa399fd97414abaffBill Wendlingvoid DwarfException::EmitExceptionTable() { 630ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos(); 631ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const std::vector<unsigned> &FilterIds = MMI->getFilterIds(); 632ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads(); 633ade025c65c12503aba161a4fa399fd97414abaffBill Wendling if (PadInfos.empty()) return; 634ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 635ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // Sort the landing pads in order of their type ids. This is used to fold 636ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // duplicate actions. 637ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVector<const LandingPadInfo *, 64> LandingPads; 638ade025c65c12503aba161a4fa399fd97414abaffBill Wendling LandingPads.reserve(PadInfos.size()); 639ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 640ade025c65c12503aba161a4fa399fd97414abaffBill Wendling for (unsigned i = 0, N = PadInfos.size(); i != N; ++i) 641ade025c65c12503aba161a4fa399fd97414abaffBill Wendling LandingPads.push_back(&PadInfos[i]); 642ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 643ade025c65c12503aba161a4fa399fd97414abaffBill Wendling std::sort(LandingPads.begin(), LandingPads.end(), PadLT); 644ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 645ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // Compute the actions table and gather the first action index for each 646ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // landing pad site. 647ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVector<ActionEntry, 32> Actions; 648ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVector<unsigned, 64> FirstActions; 64928275fdf02885587156da5cb20388b22d5b96557Bill Wendling unsigned SizeActions = ComputeActionsTable(LandingPads, Actions, 65028275fdf02885587156da5cb20388b22d5b96557Bill Wendling FirstActions); 651ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 652ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // Invokes and nounwind calls have entries in PadMap (due to being bracketed 653ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // by try-range labels when lowered). Ordinary calls do not, so appropriate 65428275fdf02885587156da5cb20388b22d5b96557Bill Wendling // try-ranges for them need be deduced when using DWARF exception handling. 655ade025c65c12503aba161a4fa399fd97414abaffBill Wendling RangeMapType PadMap; 656ade025c65c12503aba161a4fa399fd97414abaffBill Wendling for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) { 657ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const LandingPadInfo *LandingPad = LandingPads[i]; 658ade025c65c12503aba161a4fa399fd97414abaffBill Wendling for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) { 659ade025c65c12503aba161a4fa399fd97414abaffBill Wendling unsigned BeginLabel = LandingPad->BeginLabels[j]; 660ade025c65c12503aba161a4fa399fd97414abaffBill Wendling assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!"); 661ade025c65c12503aba161a4fa399fd97414abaffBill Wendling PadRange P = { i, j }; 662ade025c65c12503aba161a4fa399fd97414abaffBill Wendling PadMap[BeginLabel] = P; 663ade025c65c12503aba161a4fa399fd97414abaffBill Wendling } 664ade025c65c12503aba161a4fa399fd97414abaffBill Wendling } 665ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 666ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // Compute the call-site table. 667ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVector<CallSiteEntry, 64> CallSites; 6688b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach ComputeCallSiteTable(CallSites, PadMap, LandingPads, FirstActions); 669eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 670eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Final tallies. 671eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 672eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Call sites. 67340121bccbee44d387ab5d6a5194c5fc27c542e12Bill Wendling const unsigned SiteStartSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4); 67440121bccbee44d387ab5d6a5194c5fc27c542e12Bill Wendling const unsigned SiteLengthSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4); 67540121bccbee44d387ab5d6a5194c5fc27c542e12Bill Wendling const unsigned LandingPadSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4); 676d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling bool IsSJLJ = MAI->getExceptionHandlingType() == ExceptionHandling::SjLj; 677d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling bool HaveTTData = IsSJLJ ? (!TypeInfos.empty() || !FilterIds.empty()) : true; 67828275fdf02885587156da5cb20388b22d5b96557Bill Wendling unsigned SizeSites; 679d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling 680d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling if (IsSJLJ) 6818b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach SizeSites = 0; 682d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling else 6831b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach SizeSites = CallSites.size() * 6841b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach (SiteStartSize + SiteLengthSize + LandingPadSize); 685d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling 6861b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach for (unsigned i = 0, e = CallSites.size(); i < e; ++i) { 687af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner SizeSites += MCAsmInfo::getULEB128Size(CallSites[i].Action); 688d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling if (IsSJLJ) 689af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner SizeSites += MCAsmInfo::getULEB128Size(i); 6901b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 691d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling 692eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Type infos. 693d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner const MCSection *LSDASection = Asm->getObjFileLowering().getLSDASection(); 694fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling unsigned TTypeFormat; 695a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned TypeFormatSize; 696eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 69743e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling if (!HaveTTData) { 69828275fdf02885587156da5cb20388b22d5b96557Bill Wendling // For SjLj exceptions, if there is no TypeInfo, then we just explicitly say 69928275fdf02885587156da5cb20388b22d5b96557Bill Wendling // that we're omitting that bit. 700fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling TTypeFormat = dwarf::DW_EH_PE_omit; 701a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling TypeFormatSize = SizeOfEncodedValue(dwarf::DW_EH_PE_absptr); 70281c9a069377e9474d010f04eebe8325fd11429e3Chris Lattner } else { 703ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // Okay, we have actual filters or typeinfos to emit. As such, we need to 704ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // pick a type encoding for them. We're about to emit a list of pointers to 705ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // typeinfo objects at the end of the LSDA. However, unless we're in static 706ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // mode, this reference will require a relocation by the dynamic linker. 70746b754c76bd6a720dd1dd3be248cb93a4e25d3e5Chris Lattner // 708ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // Because of this, we have a couple of options: 70928275fdf02885587156da5cb20388b22d5b96557Bill Wendling // 710ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 1) If we are in -static mode, we can always use an absolute reference 711ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // from the LSDA, because the static linker will resolve it. 71228275fdf02885587156da5cb20388b22d5b96557Bill Wendling // 713ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 2) Otherwise, if the LSDA section is writable, we can output the direct 714ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // reference to the typeinfo and allow the dynamic linker to relocate 715ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // it. Since it is in a writable section, the dynamic linker won't 716ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // have a problem. 71728275fdf02885587156da5cb20388b22d5b96557Bill Wendling // 718ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 3) Finally, if we're in PIC mode and the LDSA section isn't writable, 719ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // we need to use some form of indirection. For example, on Darwin, 720ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // we can output a statically-relocatable reference to a dyld stub. The 721ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // offset to the stub is constant, but the contents are in a section 722ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // that is updated by the dynamic linker. This is easy enough, but we 723ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // need to tell the personality function of the unwinder to indirect 724ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // through the dyld stub. 725ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 72643e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling // FIXME: When (3) is actually implemented, we'll have to emit the stubs 727ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // somewhere. This predicate should be moved to a shared location that is 728ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // in target-independent code. 729ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 730ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling if ((LSDASection->getKind().isWriteable() && 731ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling !LSDASection->getKind().isDataRel()) || 73243e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling Asm->TM.getRelocationModel() == Reloc::Static) 73343e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling TTypeFormat = dwarf::DW_EH_PE_absptr; 73443e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling else 73543e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling TTypeFormat = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 73643e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling dwarf::DW_EH_PE_sdata4; 737a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling 738a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling TypeFormatSize = SizeOfEncodedValue(TTypeFormat); 739fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling } 740fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 741fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling // Begin the exception table. 742fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->OutStreamer.SwitchSection(LSDASection); 743fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EmitAlignment(2, 0, 0, false); 74443e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling 745fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling O << "GCC_except_table" << SubprogramCount << ":\n"; 746a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling 747a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // The type infos need to be aligned. GCC does this by inserting padding just 748a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // before the type infos. However, this changes the size of the exception 749a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // table, so you need to take this into account when you output the exception 750a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // table size. However, the size is output using a variable length encoding. 751a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // So by increasing the size by inserting padding, you may increase the number 752a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // of bytes used for writing the size. If it increases, say by one byte, then 753a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // you now need to output one less byte of padding to get the type infos 754a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // aligned. However this decreases the size of the exception table. This 755a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // changes the value you have to output for the exception table size. Due to 756a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // the variable length encoding, the number of bytes used for writing the 757a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // length may decrease. If so, you then have to increase the amount of 758a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // padding. And so on. If you look carefully at the GCC code you will see that 759a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // it indeed does this in a loop, going on and on until the values stabilize. 760a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // We chose another solution: don't output padding inside the table like GCC 761a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // does, instead output it before the table. 762a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned SizeTypes = TypeInfos.size() * TypeFormatSize; 763a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned TyOffset = sizeof(int8_t) + // Call site format 764a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling MCAsmInfo::getULEB128Size(SizeSites) + // Call-site table length 765a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling SizeSites + SizeActions + SizeTypes; 766a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned TotalSize = sizeof(int8_t) + // LPStart format 767a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling sizeof(int8_t) + // TType format 768a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling (HaveTTData ? 769a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling MCAsmInfo::getULEB128Size(TyOffset) : 0) + // TType base offset 770a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling TyOffset; 771a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned SizeAlign = (4 - TotalSize) & 3; 772a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling 773a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling for (unsigned i = 0; i != SizeAlign; ++i) { 774a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling Asm->EmitInt8(0); 775a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling Asm->EOL("Padding"); 776a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling } 777a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling 778fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling EmitLabel("exception", SubprogramCount); 779fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 780fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling if (IsSJLJ) { 781fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling SmallString<16> LSDAName; 782fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling raw_svector_ostream(LSDAName) << MAI->getPrivateGlobalPrefix() << 783fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling "_LSDA_" << Asm->getFunctionNumber(); 784fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling O << LSDAName.str() << ":\n"; 785fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling } 786fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 787fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling // Emit the header. 788fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EmitInt8(dwarf::DW_EH_PE_omit); 789fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EOL("@LPStart format", dwarf::DW_EH_PE_omit); 790fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 791fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EmitInt8(TTypeFormat); 792fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EOL("@TType format", TTypeFormat); 793fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 794fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling if (HaveTTData) { 795a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling Asm->EmitULEB128Bytes(TyOffset); 796a583c55864e83e470333b7be878280b10e175a6eBill Wendling Asm->EOL("@TType base offset"); 7971b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 798b0d9c3e7fdc952ae7cbe169b01ccaf1b80329403Bill Wendling 79928275fdf02885587156da5cb20388b22d5b96557Bill Wendling // SjLj Exception handling 800d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling if (IsSJLJ) { 801639217cb6a3948800c71c39503f8def4873a535eBill Wendling Asm->EmitInt8(dwarf::DW_EH_PE_udata4); 8020734d35044c304dd072f20e49840bcbea427db9cBill Wendling Asm->EOL("Call site format", dwarf::DW_EH_PE_udata4); 8031b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitULEB128Bytes(SizeSites); 804a583c55864e83e470333b7be878280b10e175a6eBill Wendling Asm->EOL("Call site table length"); 8051b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach 8061b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach // Emit the landing pad site information. 8078b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach unsigned idx = 0; 8088b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach for (SmallVectorImpl<CallSiteEntry>::const_iterator 8098b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach I = CallSites.begin(), E = CallSites.end(); I != E; ++I, ++idx) { 8108b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach const CallSiteEntry &S = *I; 811a583c55864e83e470333b7be878280b10e175a6eBill Wendling 812a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the landing pad, counted in 16-byte bundles relative to the 813a583c55864e83e470333b7be878280b10e175a6eBill Wendling // @LPStart address. 8148b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach Asm->EmitULEB128Bytes(idx); 8151b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Landing pad"); 816a583c55864e83e470333b7be878280b10e175a6eBill Wendling 817a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the first associated action record, relative to the start of 818a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the action table. This value is biased by 1 (1 indicates the start of 819a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the action table), and 0 indicates that there are no actions. 8201b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitULEB128Bytes(S.Action); 8211b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Action"); 8221b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 8231b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } else { 8241b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach // DWARF Exception handling 82533adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner assert(MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf); 8261b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach 827a583c55864e83e470333b7be878280b10e175a6eBill Wendling // The call-site table is a list of all call sites that may throw an 828a583c55864e83e470333b7be878280b10e175a6eBill Wendling // exception (including C++ 'throw' statements) in the procedure 829a583c55864e83e470333b7be878280b10e175a6eBill Wendling // fragment. It immediately follows the LSDA header. Each entry indicates, 830a583c55864e83e470333b7be878280b10e175a6eBill Wendling // for a given call, the first corresponding action record and corresponding 831a583c55864e83e470333b7be878280b10e175a6eBill Wendling // landing pad. 832a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 833a583c55864e83e470333b7be878280b10e175a6eBill Wendling // The table begins with the number of bytes, stored as an LEB128 834a583c55864e83e470333b7be878280b10e175a6eBill Wendling // compressed, unsigned integer. The records immediately follow the record 835a583c55864e83e470333b7be878280b10e175a6eBill Wendling // count. They are sorted in increasing call-site address. Each record 836a583c55864e83e470333b7be878280b10e175a6eBill Wendling // indicates: 837a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 838a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * The position of the call-site. 839a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * The position of the landing pad. 840a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * The first action record for that call site. 841a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 842a583c55864e83e470333b7be878280b10e175a6eBill Wendling // A missing entry in the call-site table indicates that a call is not 84328275fdf02885587156da5cb20388b22d5b96557Bill Wendling // supposed to throw. 844a583c55864e83e470333b7be878280b10e175a6eBill Wendling 845a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Emit the landing pad call site table. 846639217cb6a3948800c71c39503f8def4873a535eBill Wendling Asm->EmitInt8(dwarf::DW_EH_PE_udata4); 8470734d35044c304dd072f20e49840bcbea427db9cBill Wendling Asm->EOL("Call site format", dwarf::DW_EH_PE_udata4); 8481b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitULEB128Bytes(SizeSites); 849a583c55864e83e470333b7be878280b10e175a6eBill Wendling Asm->EOL("Call site table size"); 850eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8511b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach for (SmallVectorImpl<CallSiteEntry>::const_iterator 8525cff487665097d971067cbede1598e249f673182Bill Wendling I = CallSites.begin(), E = CallSites.end(); I != E; ++I) { 8531b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach const CallSiteEntry &S = *I; 8541b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach const char *BeginTag; 8551b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach unsigned BeginNumber; 856eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8571b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (!S.BeginLabel) { 8581b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach BeginTag = "eh_func_begin"; 8591b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach BeginNumber = SubprogramCount; 8601b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } else { 8611b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach BeginTag = "label"; 8621b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach BeginNumber = S.BeginLabel; 8631b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 864eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 865a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the call site relative to the previous call site, counted in 866a583c55864e83e470333b7be878280b10e175a6eBill Wendling // number of 16-byte bundles. The first call site is counted relative to 867a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the start of the procedure fragment. 8681b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount, 8691b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach true, true); 8701b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Region start"); 871eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8721b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (!S.EndLabel) 8731b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber, 8741b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach true); 8751b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach else 8761b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach EmitDifference("label", S.EndLabel, BeginTag, BeginNumber, true); 877eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8781b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Region length"); 879eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 880a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the landing pad, counted in 16-byte bundles relative to the 881a583c55864e83e470333b7be878280b10e175a6eBill Wendling // @LPStart address. 8821b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (!S.PadLabel) 8831b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitInt32(0); 8841b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach else 8851b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount, 8861b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach true, true); 887eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8881b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Landing pad"); 889eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 890a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the first associated action record, relative to the start of 891a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the action table. This value is biased by 1 (1 indicates the start of 892a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the action table), and 0 indicates that there are no actions. 8931b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitULEB128Bytes(S.Action); 8941b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Action"); 8951b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 896eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 897eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 898a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Emit the Action Table. 8995cff487665097d971067cbede1598e249f673182Bill Wendling for (SmallVectorImpl<ActionEntry>::const_iterator 9005cff487665097d971067cbede1598e249f673182Bill Wendling I = Actions.begin(), E = Actions.end(); I != E; ++I) { 9015cff487665097d971067cbede1598e249f673182Bill Wendling const ActionEntry &Action = *I; 902a583c55864e83e470333b7be878280b10e175a6eBill Wendling 903a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Type Filter 904a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 905a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Used by the runtime to match the type of the thrown exception to the 906a583c55864e83e470333b7be878280b10e175a6eBill Wendling // type of the catch clauses or the types in the exception specification. 907a583c55864e83e470333b7be878280b10e175a6eBill Wendling 908eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitSLEB128Bytes(Action.ValueForTypeID); 909eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("TypeInfo index"); 910a583c55864e83e470333b7be878280b10e175a6eBill Wendling 911a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Action Record 912a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 913a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Self-relative signed displacement in bytes of the next action record, 914a583c55864e83e470333b7be878280b10e175a6eBill Wendling // or 0 if there is no next action record. 915a583c55864e83e470333b7be878280b10e175a6eBill Wendling 916eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitSLEB128Bytes(Action.NextAction); 917eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Next action"); 918eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 919eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 92048dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling // Emit the Catch TypeInfos. 921ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering(); 922ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling unsigned Index = 1; 923ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling 9245cff487665097d971067cbede1598e249f673182Bill Wendling for (std::vector<GlobalVariable *>::const_reverse_iterator 925ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I, ++Index) { 926ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling const GlobalVariable *TI = *I; 927ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling 928ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling if (TI) { 929ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling if (!LSDASection->getKind().isDataRel() && 930ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling (TTypeFormat == dwarf::DW_EH_PE_absptr || 931ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling TI->getLinkage() == GlobalValue::InternalLinkage)) { 932ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling // Print out the unadorned name of the type info. 933ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling PrintRelDirective(); 934ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling O << Asm->Mang->getMangledName(TI); 935ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling } else { 936ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling bool IsTypeInfoIndirect = false, IsTypeInfoPCRel = false; 937ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling const MCExpr *TypeInfoRef = 938ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling TLOF.getSymbolForDwarfGlobalReference(TI, Asm->Mang, Asm->MMI, 939ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling IsTypeInfoIndirect, 940ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling IsTypeInfoPCRel); 941296ab7e5445f0402d0aae3814c38f964d6f547fbBill Wendling 942ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling if (!IsTypeInfoPCRel) 943ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling TypeInfoRef = CreateLabelDiff(TypeInfoRef, "typeinforef_addr", Index); 944ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling 945ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling O << MAI->getData32bitsDirective(); 946ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling TypeInfoRef->print(O, MAI); 947ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling } 948eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } else { 949ec0445855179d2c9fb98a2c8a42e03525762f45fBill Wendling PrintRelDirective(); 950049e98d641f90e90e8312d76cbf4c68908fb9d1dBill Wendling O << "0x0"; 951eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 952eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 953eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("TypeInfo"); 954eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 955eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 95648dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling // Emit the Exception Specifications. 9575cff487665097d971067cbede1598e249f673182Bill Wendling for (std::vector<unsigned>::const_iterator 9585cff487665097d971067cbede1598e249f673182Bill Wendling I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) { 9595cff487665097d971067cbede1598e249f673182Bill Wendling unsigned TypeID = *I; 960eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitULEB128Bytes(TypeID); 96148dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling if (TypeID != 0) 96248dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling Asm->EOL("Exception specification"); 96348dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling else 96448dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling Asm->EOL(); 965eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 966eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 967eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitAlignment(2, 0, 0, false); 968eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 969eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 970eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// EndModule - Emit all exception information that should come after the 971eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// content. 972eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingvoid DwarfException::EndModule() { 97333adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner if (MAI->getExceptionHandlingType() != ExceptionHandling::Dwarf) 9741b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach return; 975b4049fe8cbb38416522f7b214f028ef0b7693d21Bill Wendling 97652783c63a13d384582997684384553e6545852d3Bill Wendling if (!shouldEmitMovesModule && !shouldEmitTableModule) 97752783c63a13d384582997684384553e6545852d3Bill Wendling return; 97852783c63a13d384582997684384553e6545852d3Bill Wendling 979eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (TimePassesIsEnabled) 980eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->startTimer(); 981eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 98252783c63a13d384582997684384553e6545852d3Bill Wendling const std::vector<Function *> Personalities = MMI->getPersonalities(); 983b4049fe8cbb38416522f7b214f028ef0b7693d21Bill Wendling 98428275fdf02885587156da5cb20388b22d5b96557Bill Wendling for (unsigned I = 0, E = Personalities.size(); I < E; ++I) 98528275fdf02885587156da5cb20388b22d5b96557Bill Wendling EmitCIE(Personalities[I], I); 986eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 98752783c63a13d384582997684384553e6545852d3Bill Wendling for (std::vector<FunctionEHFrameInfo>::iterator 98852783c63a13d384582997684384553e6545852d3Bill Wendling I = EHFrames.begin(), E = EHFrames.end(); I != E; ++I) 98952783c63a13d384582997684384553e6545852d3Bill Wendling EmitFDE(*I); 990eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 991eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (TimePassesIsEnabled) 992eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->stopTimer(); 993eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 994eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 99528275fdf02885587156da5cb20388b22d5b96557Bill Wendling/// BeginFunction - Gather pre-function exception information. Assumes it's 99628275fdf02885587156da5cb20388b22d5b96557Bill Wendling/// being emitted immediately after the function entry point. 997eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingvoid DwarfException::BeginFunction(MachineFunction *MF) { 99873c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling if (!MMI || !MAI->doesSupportExceptionHandling()) return; 99973c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling 1000eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (TimePassesIsEnabled) 1001eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->startTimer(); 1002eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1003eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling this->MF = MF; 1004eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling shouldEmitTable = shouldEmitMoves = false; 1005eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 100673c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling // Map all labels and get rid of any dead landing pads. 100773c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling MMI->TidyLandingPads(); 1008eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 100973c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling // If any landing pads survive, we need an EH table. 101073c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling if (!MMI->getLandingPads().empty()) 101173c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling shouldEmitTable = true; 1012eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 101373c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling // See if we need frame move info. 101473c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling if (!MF->getFunction()->doesNotThrow() || UnwindTablesMandatory) 101573c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling shouldEmitMoves = true; 1016eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 101773c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling if (shouldEmitMoves || shouldEmitTable) 101873c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling // Assumes in correct section after the entry point. 101973c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling EmitLabel("eh_func_begin", ++SubprogramCount); 1020eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1021eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling shouldEmitTableModule |= shouldEmitTable; 1022eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling shouldEmitMovesModule |= shouldEmitMoves; 1023eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1024eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (TimePassesIsEnabled) 1025eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->stopTimer(); 1026eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 1027eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1028eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// EndFunction - Gather and emit post-function exception information. 1029eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// 1030eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingvoid DwarfException::EndFunction() { 10317b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling if (!shouldEmitMoves && !shouldEmitTable) return; 10327b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling 1033dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher if (TimePassesIsEnabled) 1034eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->startTimer(); 1035eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 10367b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling EmitLabel("eh_func_end", SubprogramCount); 10377b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling EmitExceptionTable(); 10387b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling 103925d812bd7d1f58f2ba1b598b1425a2e146e27381Chris Lattner std::string FunctionEHName = 104025d812bd7d1f58f2ba1b598b1425a2e146e27381Chris Lattner Asm->Mang->getMangledName(MF->getFunction(), ".eh", 104125d812bd7d1f58f2ba1b598b1425a2e146e27381Chris Lattner Asm->MAI->is_EHSymbolPrivate()); 104225d812bd7d1f58f2ba1b598b1425a2e146e27381Chris Lattner 10437b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling // Save EH frame information 104425d812bd7d1f58f2ba1b598b1425a2e146e27381Chris Lattner EHFrames.push_back(FunctionEHFrameInfo(FunctionEHName, SubprogramCount, 10457b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling MMI->getPersonalityIndex(), 10467b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling MF->getFrameInfo()->hasCalls(), 10477b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling !MMI->getLandingPads().empty(), 10487b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling MMI->getFrameMoves(), 10497b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling MF->getFunction())); 1050eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 105152783c63a13d384582997684384553e6545852d3Bill Wendling // Record if this personality index uses a landing pad. 105252783c63a13d384582997684384553e6545852d3Bill Wendling UsesLSDA[MMI->getPersonalityIndex()] |= !MMI->getLandingPads().empty(); 105352783c63a13d384582997684384553e6545852d3Bill Wendling 1054dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher if (TimePassesIsEnabled) 1055eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->stopTimer(); 1056eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 1057