DwarfException.cpp revision a8c18890da312e810c687b78658dcd4c989b9776
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" 257a2ba94d03b43f41b54872dacd7b2250dde4c7bdChris Lattner#include "llvm/MC/MCSymbol.h" 2645111d160cf0910030eeb6a949c69273502e5ad5Chris Lattner#include "llvm/Target/Mangler.h" 27eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/Target/TargetData.h" 28eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/Target/TargetFrameInfo.h" 29d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner#include "llvm/Target/TargetLoweringObjectFile.h" 30eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/Target/TargetOptions.h" 31d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner#include "llvm/Target/TargetRegisterInfo.h" 326c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner#include "llvm/Support/Dwarf.h" 336c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner#include "llvm/Support/Timer.h" 346c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner#include "llvm/Support/raw_ostream.h" 35c40d9f9bae70c83947bf8fa5f9ee97adbf1bb0c0Jim Grosbach#include "llvm/ADT/SmallString.h" 36eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling#include "llvm/ADT/StringExtras.h" 37eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingusing namespace llvm; 38eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 39bc0d23afae781c45f92865c1c27bed0ce51fe545Bill WendlingDwarfException::DwarfException(raw_ostream &OS, AsmPrinter *A, 40af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner const MCAsmInfo *T) 41bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling : Dwarf(OS, A, T, "eh"), shouldEmitTable(false), shouldEmitMoves(false), 42bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling shouldEmitTableModule(false), shouldEmitMovesModule(false), 43bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling ExceptionTimer(0) { 44dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher if (TimePassesIsEnabled) 450b86a6f049e4d839bd770241571628d10c980887Chris Lattner ExceptionTimer = new Timer("DWARF Exception Writer"); 46bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling} 47bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling 48bc0d23afae781c45f92865c1c27bed0ce51fe545Bill WendlingDwarfException::~DwarfException() { 49bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling delete ExceptionTimer; 50bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling} 51bc0d23afae781c45f92865c1c27bed0ce51fe545Bill Wendling 52bb3e29932d14cc012149a1ab452b88e6f6f5bb49Bill Wendling/// SizeOfEncodedValue - Return the size of the encoding in bytes. 5352783c63a13d384582997684384553e6545852d3Bill Wendlingunsigned DwarfException::SizeOfEncodedValue(unsigned Encoding) { 5452783c63a13d384582997684384553e6545852d3Bill Wendling if (Encoding == dwarf::DW_EH_PE_omit) 5552783c63a13d384582997684384553e6545852d3Bill Wendling return 0; 5652783c63a13d384582997684384553e6545852d3Bill Wendling 5752783c63a13d384582997684384553e6545852d3Bill Wendling switch (Encoding & 0x07) { 5852783c63a13d384582997684384553e6545852d3Bill Wendling case dwarf::DW_EH_PE_absptr: 5952783c63a13d384582997684384553e6545852d3Bill Wendling return TD->getPointerSize(); 6052783c63a13d384582997684384553e6545852d3Bill Wendling case dwarf::DW_EH_PE_udata2: 6152783c63a13d384582997684384553e6545852d3Bill Wendling return 2; 6252783c63a13d384582997684384553e6545852d3Bill Wendling case dwarf::DW_EH_PE_udata4: 6352783c63a13d384582997684384553e6545852d3Bill Wendling return 4; 6452783c63a13d384582997684384553e6545852d3Bill Wendling case dwarf::DW_EH_PE_udata8: 6552783c63a13d384582997684384553e6545852d3Bill Wendling return 8; 6652783c63a13d384582997684384553e6545852d3Bill Wendling } 6752783c63a13d384582997684384553e6545852d3Bill Wendling 6828275fdf02885587156da5cb20388b22d5b96557Bill Wendling assert(0 && "Invalid encoded value."); 6952783c63a13d384582997684384553e6545852d3Bill Wendling return 0; 7052783c63a13d384582997684384553e6545852d3Bill Wendling} 7152783c63a13d384582997684384553e6545852d3Bill Wendling 727378b1bd00033d8be64d388d60a562027cbf953aBill Wendling/// CreateLabelDiff - Emit a label and subtract it from the expression we 737378b1bd00033d8be64d388d60a562027cbf953aBill Wendling/// already have. This is equivalent to emitting "foo - .", but we have to emit 747378b1bd00033d8be64d388d60a562027cbf953aBill Wendling/// the label for "." directly. 757378b1bd00033d8be64d388d60a562027cbf953aBill Wendlingconst MCExpr *DwarfException::CreateLabelDiff(const MCExpr *ExprRef, 767378b1bd00033d8be64d388d60a562027cbf953aBill Wendling const char *LabelName, 777378b1bd00033d8be64d388d60a562027cbf953aBill Wendling unsigned Index) { 787378b1bd00033d8be64d388d60a562027cbf953aBill Wendling SmallString<64> Name; 797378b1bd00033d8be64d388d60a562027cbf953aBill Wendling raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() 807378b1bd00033d8be64d388d60a562027cbf953aBill Wendling << LabelName << Asm->getFunctionNumber() 817378b1bd00033d8be64d388d60a562027cbf953aBill Wendling << "_" << Index; 827378b1bd00033d8be64d388d60a562027cbf953aBill Wendling MCSymbol *DotSym = Asm->OutContext.GetOrCreateSymbol(Name.str()); 837378b1bd00033d8be64d388d60a562027cbf953aBill Wendling Asm->OutStreamer.EmitLabel(DotSym); 847378b1bd00033d8be64d388d60a562027cbf953aBill Wendling 857378b1bd00033d8be64d388d60a562027cbf953aBill Wendling return MCBinaryExpr::CreateSub(ExprRef, 867378b1bd00033d8be64d388d60a562027cbf953aBill Wendling MCSymbolRefExpr::Create(DotSym, 877378b1bd00033d8be64d388d60a562027cbf953aBill Wendling Asm->OutContext), 887378b1bd00033d8be64d388d60a562027cbf953aBill Wendling Asm->OutContext); 897378b1bd00033d8be64d388d60a562027cbf953aBill Wendling} 907378b1bd00033d8be64d388d60a562027cbf953aBill Wendling 917ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendling/// EmitCIE - Emit a Common Information Entry (CIE). This holds information that 927ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendling/// is shared among many Frame Description Entries. There is at least one CIE 937ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendling/// in every non-empty .debug_frame section. 948c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattnervoid DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) { 95eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Size and sign of stack growth. 96eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int stackGrowth = 97eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->TM.getFrameInfo()->getStackGrowthDirection() == 98eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling TargetFrameInfo::StackGrowsUp ? 99eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling TD->getPointerSize() : -TD->getPointerSize(); 100eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1018c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering(); 1028c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner 103eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Begin eh frame section. 1048c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection()); 105eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 10633adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner if (MAI->is_EHSymbolPrivate()) 10733adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner O << MAI->getPrivateGlobalPrefix(); 108eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling O << "EH_frame" << Index << ":\n"; 1098c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner 110eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("section_eh_frame", Index); 111eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 112eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Define base labels. 113eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_common", Index); 114eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 115eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Define the eh frame length. 116eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitDifference("eh_frame_common_end", Index, 117eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling "eh_frame_common_begin", Index, true); 118eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Length of Common Information Entry"); 119eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 120eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // EH frame header. 121eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_common_begin", Index); 122eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitInt32((int)0); 123eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Identifier Tag"); 124eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitInt8(dwarf::DW_CIE_VERSION); 125eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Version"); 126eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 127eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // The personality presence indicates that language specific information will 1288c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner // show up in the eh frame. Find out how we are supposed to lower the 1298c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner // personality function reference: 1308c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner const MCExpr *PersonalityRef = 0; 1318c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner bool IsPersonalityIndirect = false, IsPersonalityPCRel = false; 1328c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner if (PersonalityFn) { 1338c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner // FIXME: HANDLE STATIC CODEGEN MODEL HERE. 1348c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner 1358c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner // In non-static mode, ask the object file how to represent this reference. 1368c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner PersonalityRef = 1378c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner TLOF.getSymbolForDwarfGlobalReference(PersonalityFn, Asm->Mang, 1388609c7c931c0213d6d29f665df2110cf3c709e4cChris Lattner Asm->MMI, 1398c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner IsPersonalityIndirect, 1408c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner IsPersonalityPCRel); 1418c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner } 1428c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner 14352783c63a13d384582997684384553e6545852d3Bill Wendling unsigned PerEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 1448c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner if (IsPersonalityIndirect) 14552783c63a13d384582997684384553e6545852d3Bill Wendling PerEncoding |= dwarf::DW_EH_PE_indirect; 14652783c63a13d384582997684384553e6545852d3Bill Wendling unsigned LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 14752783c63a13d384582997684384553e6545852d3Bill Wendling unsigned FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 14852783c63a13d384582997684384553e6545852d3Bill Wendling 14952783c63a13d384582997684384553e6545852d3Bill Wendling char Augmentation[5] = { 0 }; 15052783c63a13d384582997684384553e6545852d3Bill Wendling unsigned AugmentationSize = 0; 15152783c63a13d384582997684384553e6545852d3Bill Wendling char *APtr = Augmentation + 1; 15252783c63a13d384582997684384553e6545852d3Bill Wendling 1538c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner if (PersonalityRef) { 15452783c63a13d384582997684384553e6545852d3Bill Wendling // There is a personality function. 15552783c63a13d384582997684384553e6545852d3Bill Wendling *APtr++ = 'P'; 15652783c63a13d384582997684384553e6545852d3Bill Wendling AugmentationSize += 1 + SizeOfEncodedValue(PerEncoding); 15752783c63a13d384582997684384553e6545852d3Bill Wendling } 15852783c63a13d384582997684384553e6545852d3Bill Wendling 15952783c63a13d384582997684384553e6545852d3Bill Wendling if (UsesLSDA[Index]) { 16052783c63a13d384582997684384553e6545852d3Bill Wendling // An LSDA pointer is in the FDE augmentation. 16152783c63a13d384582997684384553e6545852d3Bill Wendling *APtr++ = 'L'; 16252783c63a13d384582997684384553e6545852d3Bill Wendling ++AugmentationSize; 16352783c63a13d384582997684384553e6545852d3Bill Wendling } 16452783c63a13d384582997684384553e6545852d3Bill Wendling 16552783c63a13d384582997684384553e6545852d3Bill Wendling if (FDEEncoding != dwarf::DW_EH_PE_absptr) { 16652783c63a13d384582997684384553e6545852d3Bill Wendling // A non-default pointer encoding for the FDE. 16752783c63a13d384582997684384553e6545852d3Bill Wendling *APtr++ = 'R'; 16852783c63a13d384582997684384553e6545852d3Bill Wendling ++AugmentationSize; 16952783c63a13d384582997684384553e6545852d3Bill Wendling } 17052783c63a13d384582997684384553e6545852d3Bill Wendling 17152783c63a13d384582997684384553e6545852d3Bill Wendling if (APtr != Augmentation + 1) 17252783c63a13d384582997684384553e6545852d3Bill Wendling Augmentation[0] = 'z'; 17352783c63a13d384582997684384553e6545852d3Bill Wendling 17452783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitString(Augmentation); 175eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Augmentation"); 176eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 177eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Round out reader. 178eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitULEB128Bytes(1); 179eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Code Alignment Factor"); 180eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitSLEB128Bytes(stackGrowth); 181eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Data Alignment Factor"); 182eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true)); 183eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("CIE Return Address Column"); 184eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 18552783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitULEB128Bytes(AugmentationSize); 18652783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EOL("Augmentation Size"); 18752783c63a13d384582997684384553e6545852d3Bill Wendling 18852783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitInt8(PerEncoding); 18952783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EOL("Personality", PerEncoding); 19052783c63a13d384582997684384553e6545852d3Bill Wendling 1914bda11fbdafc1d4fa97b7539bdf5a0f62ecfc280Bill Wendling // If there is a personality, we need to indicate the function's location. 1928c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner if (PersonalityRef) { 1937378b1bd00033d8be64d388d60a562027cbf953aBill Wendling if (!IsPersonalityPCRel) 1947378b1bd00033d8be64d388d60a562027cbf953aBill Wendling PersonalityRef = CreateLabelDiff(PersonalityRef, "personalityref_addr", 1957378b1bd00033d8be64d388d60a562027cbf953aBill Wendling Index); 1967378b1bd00033d8be64d388d60a562027cbf953aBill Wendling 1978cb9a3b13f3226b7e741768b69d26ecd6b5231f1Chris Lattner O << MAI->getData32bitsDirective() << *PersonalityRef; 198eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Personality"); 199eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 20052783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitInt8(LSDAEncoding); 20152783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EOL("LSDA Encoding", LSDAEncoding); 202eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 20352783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EmitInt8(FDEEncoding); 20452783c63a13d384582997684384553e6545852d3Bill Wendling Asm->EOL("FDE Encoding", FDEEncoding); 205eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 206eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 207eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Indicate locations of general callee saved registers in frame. 208eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling std::vector<MachineMove> Moves; 209eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling RI->getInitialFrameState(Moves); 210eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitFrameMoves(NULL, 0, Moves, true); 211eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 212eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // On Darwin the linker honors the alignment of eh_frame, which means it must 213eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // be 8-byte on 64-bit targets to match what gcc does. Otherwise you get 214eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // holes which confuse readers of eh_frame. 2158c6ed05157e9c97ff8f3ccb211dd797e53228da1Chris Lattner Asm->EmitAlignment(TD->getPointerSize() == 4 ? 2 : 3, 0, 0, false); 216eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_common_end", Index); 217eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 218eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL(); 219eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 220eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 2217ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendling/// EmitFDE - Emit the Frame Description Entry (FDE) for the function. 2227ccda0f2aadb601ce48f05c12cc153f3fcc554e6Bill Wendlingvoid DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) { 223dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher assert(!EHFrameInfo.function->hasAvailableExternallyLinkage() && 224eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling "Should not emit 'available externally' functions at all"); 225eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 2263e0f60be46cb5363d4375f26a5e27d1dcd9867fbChris Lattner const Function *TheFunc = EHFrameInfo.function; 227dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher 2286c2f9e14fdf14d8c1c687c6bd9918183fa7f8a7fChris Lattner Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getEHFrameSection()); 229dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher 230eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Externally visible entry into the functions eh frame info. If the 231eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // corresponding function is static, this should not be externally visible. 2323e0f60be46cb5363d4375f26a5e27d1dcd9867fbChris Lattner if (!TheFunc->hasLocalLinkage()) 23310b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner if (const char *GlobalEHDirective = MAI->getGlobalEHDirective()) 23410b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner O << GlobalEHDirective << *EHFrameInfo.FunctionEHSym << '\n'; 235eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 236eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If corresponding function is weak definition, this should be too. 23710b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner if (TheFunc->isWeakForLinker() && MAI->getWeakDefDirective()) 23810b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner O << MAI->getWeakDefDirective() << *EHFrameInfo.FunctionEHSym << '\n'; 239ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling 240ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling // If corresponding function is hidden, this should be too. 241ee161a68240dfe7e28fdc45d5595380a3ec3b9c8Bill Wendling if (TheFunc->hasHiddenVisibility()) 24210b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner if (const char *HiddenDirective = MAI->getHiddenDirective()) 24310b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner O << HiddenDirective << *EHFrameInfo.FunctionEHSym << '\n'; 244eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 245eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If there are no calls then you can't unwind. This may mean we can omit the 246eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // EH Frame, but some environments do not handle weak absolute symbols. If 247eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // UnwindTablesMandatory is set we cannot do this optimization; the unwind 248eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // info is to be available for non-EH uses. 2493e0f60be46cb5363d4375f26a5e27d1dcd9867fbChris Lattner if (!EHFrameInfo.hasCalls && !UnwindTablesMandatory && 2503e0f60be46cb5363d4375f26a5e27d1dcd9867fbChris Lattner (!TheFunc->isWeakForLinker() || 25133adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner !MAI->getWeakDefDirective() || 25233adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner MAI->getSupportsWeakOmittedEHFrame())) { 25310b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner O << *EHFrameInfo.FunctionEHSym << " = 0\n"; 254eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // This name has no connection to the function, so it might get 255eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // dead-stripped when the function is not, erroneously. Prohibit 256eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // dead-stripping unconditionally. 25710b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner if (const char *UsedDirective = MAI->getUsedDirective()) 25810b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner O << UsedDirective << *EHFrameInfo.FunctionEHSym << "\n\n"; 259eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } else { 26010b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner O << *EHFrameInfo.FunctionEHSym << ":\n"; 261eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 262eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // EH frame header. 263eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitDifference("eh_frame_end", EHFrameInfo.Number, 264eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling "eh_frame_begin", EHFrameInfo.Number, true); 265eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Length of Frame Information Entry"); 266eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 267eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_begin", EHFrameInfo.Number); 268eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 269a4ff5e48fc6a4718d3a2af8654cfc06a17310aedChris Lattner EmitSectionOffset("eh_frame_begin", "eh_frame_common", 270a4ff5e48fc6a4718d3a2af8654cfc06a17310aedChris Lattner EHFrameInfo.Number, EHFrameInfo.PersonalityIndex, 271a4ff5e48fc6a4718d3a2af8654cfc06a17310aedChris Lattner true, true, false); 272eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 273eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("FDE CIE offset"); 274eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 275c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands EmitReference("eh_func_begin", EHFrameInfo.Number, true, true); 276eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("FDE initial location"); 277eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitDifference("eh_func_end", EHFrameInfo.Number, 278c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands "eh_func_begin", EHFrameInfo.Number, true); 279eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("FDE address range"); 280eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 281eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If there is a personality and landing pads then point to the language 282eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // specific data area in the exception table. 283d44fff7849034fc17d6a0e9f9926542865bb7881Eric Christopher if (MMI->getPersonalities()[0] != NULL) { 284c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands bool is4Byte = TD->getPointerSize() == sizeof(int32_t); 285c69d74a5d41a6c5e92f9d947f2fa181f48626ca5Duncan Sands 286a8c18890da312e810c687b78658dcd4c989b9776Bill Wendling if (Asm->TM.getLSDAEncoding() != DwarfLSDAEncoding::EightByte) { 287d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling Asm->EmitULEB128Bytes(4); 288d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling Asm->EOL("Augmentation size"); 289eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 290d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling if (EHFrameInfo.hasLandingPads) 291d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling EmitReference("exception", EHFrameInfo.Number, true, true); 292aeb79aea8f4761f1c46731ac6bd58cbccdcfa097Bill Wendling else 293d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling Asm->EmitInt32((int)0); 294d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling } else { 295d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling Asm->EmitULEB128Bytes(is4Byte ? 4 : 8); 296d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling Asm->EOL("Augmentation size"); 297d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling 298d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling if (EHFrameInfo.hasLandingPads) { 299d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling EmitReference("exception", EHFrameInfo.Number, true, false); 300d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling } else { 301d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling if (is4Byte) 302d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling Asm->EmitInt32((int)0); 303d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling else 304d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling Asm->EmitInt64((int)0); 305d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling } 306aeb79aea8f4761f1c46731ac6bd58cbccdcfa097Bill Wendling } 307d58e9cb42d7f5cf83c9b982df7e2c822b2e285e9Bill Wendling 308eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Language Specific Data Area"); 309eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } else { 310eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitULEB128Bytes(0); 311eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Augmentation size"); 312eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 313eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 314eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Indicate locations of function specific callee saved registers in frame. 315dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves, 316eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling true); 317eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 318eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // On Darwin the linker honors the alignment of eh_frame, which means it 319eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // must be 8-byte on 64-bit targets to match what gcc does. Otherwise you 320eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // get holes which confuse readers of eh_frame. 321eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3, 322eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 0, 0, false); 323eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling EmitLabel("eh_frame_end", EHFrameInfo.Number); 324eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 325eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If the function is marked used, this table should be also. We cannot 326eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // make the mark unconditional in this case, since retaining the table also 327eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // retains the function in this case, and there is code around that depends 328eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // on unused functions (calling undefined externals) being dead-stripped to 329eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // link correctly. Yes, there really is. 330401e10c4fbfcdcfade5065093e2ca97f69a1d144Chris Lattner if (MMI->isUsedFunction(EHFrameInfo.function)) 3317a2ba94d03b43f41b54872dacd7b2250dde4c7bdChris Lattner if (const char *UsedDirective = MAI->getUsedDirective()) { 33210b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner O << UsedDirective << *EHFrameInfo.FunctionEHSym << "\n\n"; 3337a2ba94d03b43f41b54872dacd7b2250dde4c7bdChris Lattner } 334eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 3354bda11fbdafc1d4fa97b7539bdf5a0f62ecfc280Bill Wendling 3364bda11fbdafc1d4fa97b7539bdf5a0f62ecfc280Bill Wendling Asm->EOL(); 337eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 338eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 339eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// SharedTypeIds - How many leading type ids two landing pads have in common. 340eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingunsigned DwarfException::SharedTypeIds(const LandingPadInfo *L, 341eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling const LandingPadInfo *R) { 342eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds; 343eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned LSize = LIds.size(), RSize = RIds.size(); 344eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned MinSize = LSize < RSize ? LSize : RSize; 345eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned Count = 0; 346eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 347eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (; Count != MinSize; ++Count) 348eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (LIds[Count] != RIds[Count]) 349eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return Count; 350eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 351eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return Count; 352eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 353eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 354eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// PadLT - Order landing pads lexicographically by type id. 355eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingbool DwarfException::PadLT(const LandingPadInfo *L, const LandingPadInfo *R) { 356eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds; 357eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned LSize = LIds.size(), RSize = RIds.size(); 358eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned MinSize = LSize < RSize ? LSize : RSize; 359eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 360eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (unsigned i = 0; i != MinSize; ++i) 361eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (LIds[i] != RIds[i]) 362eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return LIds[i] < RIds[i]; 363eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 364eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling return LSize < RSize; 365eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 366eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 367d4609622ade8d0ebaf57fd70700c2fedf0b3d165Bill Wendling/// ComputeActionsTable - Compute the actions table and gather the first action 368d4609622ade8d0ebaf57fd70700c2fedf0b3d165Bill Wendling/// index for each landing pad site. 369ade025c65c12503aba161a4fa399fd97414abaffBill Wendlingunsigned DwarfException:: 370ade025c65c12503aba161a4fa399fd97414abaffBill WendlingComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*> &LandingPads, 371ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVectorImpl<ActionEntry> &Actions, 372ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVectorImpl<unsigned> &FirstActions) { 373a583c55864e83e470333b7be878280b10e175a6eBill Wendling 374a583c55864e83e470333b7be878280b10e175a6eBill Wendling // The action table follows the call-site table in the LSDA. The individual 375a583c55864e83e470333b7be878280b10e175a6eBill Wendling // records are of two types: 376a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 377a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * Catch clause 378a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * Exception specification 379a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 380a583c55864e83e470333b7be878280b10e175a6eBill Wendling // The two record kinds have the same format, with only small differences. 381a583c55864e83e470333b7be878280b10e175a6eBill Wendling // They are distinguished by the "switch value" field: Catch clauses 382a583c55864e83e470333b7be878280b10e175a6eBill Wendling // (TypeInfos) have strictly positive switch values, and exception 383a583c55864e83e470333b7be878280b10e175a6eBill Wendling // specifications (FilterIds) have strictly negative switch values. Value 0 384a583c55864e83e470333b7be878280b10e175a6eBill Wendling // indicates a catch-all clause. 385a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 3865e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // Negative type IDs index into FilterIds. Positive type IDs index into 3875e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // TypeInfos. The value written for a positive type ID is just the type ID 3885e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // itself. For a negative type ID, however, the value written is the 389eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // (negative) byte offset of the corresponding FilterIds entry. The byte 3905e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // offset is usually equal to the type ID (because the FilterIds entries are 3915e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // written using a variable width encoding, which outputs one byte per entry 3925e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // as long as the value written is not too large) but can differ. This kind 3935e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling // of complication does not occur for positive type IDs because type infos are 394eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // output using a fixed width encoding. FilterOffsets[i] holds the byte 395eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // offset corresponding to FilterIds[i]. 396409914b773ffd53d53d214394d5636a76f673186Bill Wendling 397409914b773ffd53d53d214394d5636a76f673186Bill Wendling const std::vector<unsigned> &FilterIds = MMI->getFilterIds(); 398eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SmallVector<int, 16> FilterOffsets; 399eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FilterOffsets.reserve(FilterIds.size()); 400eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int Offset = -1; 401409914b773ffd53d53d214394d5636a76f673186Bill Wendling 402409914b773ffd53d53d214394d5636a76f673186Bill Wendling for (std::vector<unsigned>::const_iterator 403409914b773ffd53d53d214394d5636a76f673186Bill Wendling I = FilterIds.begin(), E = FilterIds.end(); I != E; ++I) { 404eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FilterOffsets.push_back(Offset); 405af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner Offset -= MCAsmInfo::getULEB128Size(*I); 406eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 407eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 408eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FirstActions.reserve(LandingPads.size()); 409eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 410eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int FirstAction = 0; 411eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned SizeActions = 0; 4125e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const LandingPadInfo *PrevLPI = 0; 413409914b773ffd53d53d214394d5636a76f673186Bill Wendling 4145cff487665097d971067cbede1598e249f673182Bill Wendling for (SmallVectorImpl<const LandingPadInfo *>::const_iterator 4155e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling I = LandingPads.begin(), E = LandingPads.end(); I != E; ++I) { 4165e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const LandingPadInfo *LPI = *I; 4175e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const std::vector<int> &TypeIds = LPI->TypeIds; 4185e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const unsigned NumShared = PrevLPI ? SharedTypeIds(LPI, PrevLPI) : 0; 419eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned SizeSiteActions = 0; 420eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 421eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (NumShared < TypeIds.size()) { 422eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned SizeAction = 0; 423eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ActionEntry *PrevAction = 0; 424eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 425eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (NumShared) { 4265e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling const unsigned SizePrevIds = PrevLPI->TypeIds.size(); 427eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling assert(Actions.size()); 428eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PrevAction = &Actions.back(); 429af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner SizeAction = MCAsmInfo::getSLEB128Size(PrevAction->NextAction) + 430af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID); 431eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 432eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (unsigned j = NumShared; j != SizePrevIds; ++j) { 433eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SizeAction -= 434af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID); 435eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SizeAction += -PrevAction->NextAction; 436eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PrevAction = PrevAction->Previous; 437eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 438eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 439eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 440eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Compute the actions. 4415e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling for (unsigned J = NumShared, M = TypeIds.size(); J != M; ++J) { 4425e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling int TypeID = TypeIds[J]; 4435e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling assert(-1 - TypeID < (int)FilterOffsets.size() && "Unknown filter id!"); 444eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID; 445af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner unsigned SizeTypeID = MCAsmInfo::getSLEB128Size(ValueForTypeID); 446eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 447eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0; 448af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner SizeAction = SizeTypeID + MCAsmInfo::getSLEB128Size(NextAction); 449eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SizeSiteActions += SizeAction; 450eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 451a583c55864e83e470333b7be878280b10e175a6eBill Wendling ActionEntry Action = { ValueForTypeID, NextAction, PrevAction }; 452eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Actions.push_back(Action); 453eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PrevAction = &Actions.back(); 454eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 455eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 456eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Record the first action of the landing pad site. 457eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FirstAction = SizeActions + SizeSiteActions - SizeAction + 1; 458eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } // else identical - re-use previous FirstAction 459eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 460a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Information used when created the call-site table. The action record 461a583c55864e83e470333b7be878280b10e175a6eBill Wendling // field of the call site record is the offset of the first associated 462a583c55864e83e470333b7be878280b10e175a6eBill Wendling // action record, relative to the start of the actions table. This value is 463a583c55864e83e470333b7be878280b10e175a6eBill Wendling // biased by 1 (1 in dicating the start of the actions table), and 0 464a583c55864e83e470333b7be878280b10e175a6eBill Wendling // indicates that there are no actions. 465eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling FirstActions.push_back(FirstAction); 466eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 467eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Compute this sites contribution to size. 468eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SizeActions += SizeSiteActions; 4695e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling 4705e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling PrevLPI = LPI; 471eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 472eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 4735e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling return SizeActions; 4745e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling} 4755e953ddfa3abdd684c8a43f9c9c144f584ec7d6fBill Wendling 476ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling/// CallToNoUnwindFunction - Return `true' if this is a call to a function 477ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling/// marked `nounwind'. Return `false' otherwise. 478ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendlingbool DwarfException::CallToNoUnwindFunction(const MachineInstr *MI) { 479ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling assert(MI->getDesc().isCall() && "This should be a call instruction!"); 480ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 481ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling bool MarkedNoUnwind = false; 482ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling bool SawFunc = false; 483ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 484ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) { 485ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling const MachineOperand &MO = MI->getOperand(I); 486ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 487ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling if (MO.isGlobal()) { 488ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling if (Function *F = dyn_cast<Function>(MO.getGlobal())) { 489ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling if (SawFunc) { 490ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // Be conservative. If we have more than one function operand for this 491ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // call, then we can't make the assumption that it's the callee and 492ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // not a parameter to the call. 493ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // 494ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // FIXME: Determine if there's a way to say that `F' is the callee or 495ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling // parameter. 496ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling MarkedNoUnwind = false; 497ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling break; 498ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling } 499ecc260e403d09ba04ed87d2d04226ac851c68e5aBill Wendling 500ecc260e403d09ba04ed87d2d04226ac851c68e5aBill Wendling MarkedNoUnwind = F->doesNotThrow(); 501ecc260e403d09ba04ed87d2d04226ac851c68e5aBill Wendling SawFunc = true; 502ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling } 503ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling } 504ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling } 505ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 506ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling return MarkedNoUnwind; 507ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling} 508ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling 509ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// ComputeCallSiteTable - Compute the call-site table. The entry for an invoke 510a583c55864e83e470333b7be878280b10e175a6eBill Wendling/// has a try-range containing the call, a non-zero landing pad, and an 511ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// appropriate action. The entry for an ordinary call has a try-range 512ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// containing the call and zero for the landing pad and the action. Calls 513ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// marked 'nounwind' have no entry and must not be contained in the try-range 514ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// of any entry - they form gaps in the table. Entries must be ordered by 515ade025c65c12503aba161a4fa399fd97414abaffBill Wendling/// try-range address. 516ade025c65c12503aba161a4fa399fd97414abaffBill Wendlingvoid DwarfException:: 517ade025c65c12503aba161a4fa399fd97414abaffBill WendlingComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites, 518ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const RangeMapType &PadMap, 519ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const SmallVectorImpl<const LandingPadInfo *> &LandingPads, 520ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const SmallVectorImpl<unsigned> &FirstActions) { 521eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // The end label of the previous invoke or nounwind try-range. 522eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned LastLabel = 0; 523eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 524eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Whether there is a potentially throwing instruction (currently this means 525eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // an ordinary call) between the end of the previous try-range and now. 526eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling bool SawPotentiallyThrowing = false; 527eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 5285cff487665097d971067cbede1598e249f673182Bill Wendling // Whether the last CallSite entry was for an invoke. 529eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling bool PreviousIsInvoke = false; 530eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 531eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Visit all instructions in order of address. 532eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 533eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling I != E; ++I) { 534eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end(); 535eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling MI != E; ++MI) { 536eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (!MI->isLabel()) { 537ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling if (MI->getDesc().isCall()) 538ed060dcb5c7e9cb2fd11ff3b0b98203fb53063e7Bill Wendling SawPotentiallyThrowing |= !CallToNoUnwindFunction(MI); 53973b55510585573cd37fca85864c8d7d73e6b4093Bill Wendling 540eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling continue; 541eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 542eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 543eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling unsigned BeginLabel = MI->getOperand(0).getImm(); 544eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling assert(BeginLabel && "Invalid label!"); 545eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 546eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // End of the previous try-range? 547eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (BeginLabel == LastLabel) 548eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling SawPotentiallyThrowing = false; 549eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 550eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Beginning of a new try-range? 55181cf4325698b48b02eddab921ac333c7f25005c3Jeffrey Yasskin RangeMapType::const_iterator L = PadMap.find(BeginLabel); 552eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (L == PadMap.end()) 553eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Nope, it was just some random label. 554eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling continue; 555eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 556a583c55864e83e470333b7be878280b10e175a6eBill Wendling const PadRange &P = L->second; 557eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling const LandingPadInfo *LandingPad = LandingPads[P.PadIndex]; 558eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] && 559eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling "Inconsistent landing pad map!"); 560eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 561a583c55864e83e470333b7be878280b10e175a6eBill Wendling // For Dwarf exception handling (SjLj handling doesn't use this). If some 562a583c55864e83e470333b7be878280b10e175a6eBill Wendling // instruction between the previous try-range and this one may throw, 563a583c55864e83e470333b7be878280b10e175a6eBill Wendling // create a call-site entry with no landing pad for the region between the 564a583c55864e83e470333b7be878280b10e175a6eBill Wendling // try-ranges. 5651b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (SawPotentiallyThrowing && 56633adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) { 567a583c55864e83e470333b7be878280b10e175a6eBill Wendling CallSiteEntry Site = { LastLabel, BeginLabel, 0, 0 }; 568eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling CallSites.push_back(Site); 569eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PreviousIsInvoke = false; 570eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 571eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 572eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling LastLabel = LandingPad->EndLabels[P.RangeIndex]; 573eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling assert(BeginLabel && LastLabel && "Invalid landing pad!"); 574eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 575eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (LandingPad->LandingPadLabel) { 576eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // This try-range is for an invoke. 577a583c55864e83e470333b7be878280b10e175a6eBill Wendling CallSiteEntry Site = { 578a583c55864e83e470333b7be878280b10e175a6eBill Wendling BeginLabel, 579a583c55864e83e470333b7be878280b10e175a6eBill Wendling LastLabel, 580a583c55864e83e470333b7be878280b10e175a6eBill Wendling LandingPad->LandingPadLabel, 581a583c55864e83e470333b7be878280b10e175a6eBill Wendling FirstActions[P.PadIndex] 582a583c55864e83e470333b7be878280b10e175a6eBill Wendling }; 583eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 58433668c0f1a7e374d4c3c53df34efbdf570e0987bJim Grosbach // Try to merge with the previous call-site. SJLJ doesn't do this 58533668c0f1a7e374d4c3c53df34efbdf570e0987bJim Grosbach if (PreviousIsInvoke && 58633668c0f1a7e374d4c3c53df34efbdf570e0987bJim Grosbach MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) { 587eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling CallSiteEntry &Prev = CallSites.back(); 588eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) { 589eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Extend the range of the previous entry. 590eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Prev.EndLabel = Site.EndLabel; 591eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling continue; 592eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 593eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 594eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 595eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Otherwise, create a new call-site. 596eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling CallSites.push_back(Site); 597eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PreviousIsInvoke = true; 598eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } else { 599eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Create a gap. 600eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling PreviousIsInvoke = false; 601eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 602eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 603eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 604eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 605eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // If some instruction between the previous try-range and the end of the 606eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // function may throw, create a call-site entry with no landing pad for the 607eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // region following the try-range. 6081b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (SawPotentiallyThrowing && 60933adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) { 610a583c55864e83e470333b7be878280b10e175a6eBill Wendling CallSiteEntry Site = { LastLabel, 0, 0, 0 }; 611eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling CallSites.push_back(Site); 612eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 613ade025c65c12503aba161a4fa399fd97414abaffBill Wendling} 614ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 6150dafca90761097230f02e655fdd541f59b888315Bill Wendling/// EmitExceptionTable - Emit landing pads and actions. 6160dafca90761097230f02e655fdd541f59b888315Bill Wendling/// 6170dafca90761097230f02e655fdd541f59b888315Bill Wendling/// The general organization of the table is complex, but the basic concepts are 6180dafca90761097230f02e655fdd541f59b888315Bill Wendling/// easy. First there is a header which describes the location and organization 6190dafca90761097230f02e655fdd541f59b888315Bill Wendling/// of the three components that follow. 620dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher/// 6210dafca90761097230f02e655fdd541f59b888315Bill Wendling/// 1. The landing pad site information describes the range of code covered by 6220dafca90761097230f02e655fdd541f59b888315Bill Wendling/// the try. In our case it's an accumulation of the ranges covered by the 6230dafca90761097230f02e655fdd541f59b888315Bill Wendling/// invokes in the try. There is also a reference to the landing pad that 6240dafca90761097230f02e655fdd541f59b888315Bill Wendling/// handles the exception once processed. Finally an index into the actions 6250dafca90761097230f02e655fdd541f59b888315Bill Wendling/// table. 626a583c55864e83e470333b7be878280b10e175a6eBill Wendling/// 2. The action table, in our case, is composed of pairs of type IDs and next 6270dafca90761097230f02e655fdd541f59b888315Bill Wendling/// action offset. Starting with the action index from the landing pad 628a583c55864e83e470333b7be878280b10e175a6eBill Wendling/// site, each type ID is checked for a match to the current exception. If 6290dafca90761097230f02e655fdd541f59b888315Bill Wendling/// it matches then the exception and type id are passed on to the landing 6300dafca90761097230f02e655fdd541f59b888315Bill Wendling/// pad. Otherwise the next action is looked up. This chain is terminated 63128275fdf02885587156da5cb20388b22d5b96557Bill Wendling/// with a next action of zero. If no type id is found then the frame is 6320dafca90761097230f02e655fdd541f59b888315Bill Wendling/// unwound and handling continues. 633a583c55864e83e470333b7be878280b10e175a6eBill Wendling/// 3. Type ID table contains references to all the C++ typeinfo for all 63428275fdf02885587156da5cb20388b22d5b96557Bill Wendling/// catches in the function. This tables is reverse indexed base 1. 635ade025c65c12503aba161a4fa399fd97414abaffBill Wendlingvoid DwarfException::EmitExceptionTable() { 636ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos(); 637ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const std::vector<unsigned> &FilterIds = MMI->getFilterIds(); 638ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads(); 639ade025c65c12503aba161a4fa399fd97414abaffBill Wendling if (PadInfos.empty()) return; 640ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 641ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // Sort the landing pads in order of their type ids. This is used to fold 642ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // duplicate actions. 643ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVector<const LandingPadInfo *, 64> LandingPads; 644ade025c65c12503aba161a4fa399fd97414abaffBill Wendling LandingPads.reserve(PadInfos.size()); 645ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 646ade025c65c12503aba161a4fa399fd97414abaffBill Wendling for (unsigned i = 0, N = PadInfos.size(); i != N; ++i) 647ade025c65c12503aba161a4fa399fd97414abaffBill Wendling LandingPads.push_back(&PadInfos[i]); 648ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 649ade025c65c12503aba161a4fa399fd97414abaffBill Wendling std::sort(LandingPads.begin(), LandingPads.end(), PadLT); 650ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 651ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // Compute the actions table and gather the first action index for each 652ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // landing pad site. 653ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVector<ActionEntry, 32> Actions; 654ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVector<unsigned, 64> FirstActions; 65528275fdf02885587156da5cb20388b22d5b96557Bill Wendling unsigned SizeActions = ComputeActionsTable(LandingPads, Actions, 65628275fdf02885587156da5cb20388b22d5b96557Bill Wendling FirstActions); 657ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 658ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // Invokes and nounwind calls have entries in PadMap (due to being bracketed 659ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // by try-range labels when lowered). Ordinary calls do not, so appropriate 66028275fdf02885587156da5cb20388b22d5b96557Bill Wendling // try-ranges for them need be deduced when using DWARF exception handling. 661ade025c65c12503aba161a4fa399fd97414abaffBill Wendling RangeMapType PadMap; 662ade025c65c12503aba161a4fa399fd97414abaffBill Wendling for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) { 663ade025c65c12503aba161a4fa399fd97414abaffBill Wendling const LandingPadInfo *LandingPad = LandingPads[i]; 664ade025c65c12503aba161a4fa399fd97414abaffBill Wendling for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) { 665ade025c65c12503aba161a4fa399fd97414abaffBill Wendling unsigned BeginLabel = LandingPad->BeginLabels[j]; 666ade025c65c12503aba161a4fa399fd97414abaffBill Wendling assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!"); 667ade025c65c12503aba161a4fa399fd97414abaffBill Wendling PadRange P = { i, j }; 668ade025c65c12503aba161a4fa399fd97414abaffBill Wendling PadMap[BeginLabel] = P; 669ade025c65c12503aba161a4fa399fd97414abaffBill Wendling } 670ade025c65c12503aba161a4fa399fd97414abaffBill Wendling } 671ade025c65c12503aba161a4fa399fd97414abaffBill Wendling 672ade025c65c12503aba161a4fa399fd97414abaffBill Wendling // Compute the call-site table. 673ade025c65c12503aba161a4fa399fd97414abaffBill Wendling SmallVector<CallSiteEntry, 64> CallSites; 6748b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach ComputeCallSiteTable(CallSites, PadMap, LandingPads, FirstActions); 675eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 676eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Final tallies. 677eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 678eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Call sites. 67940121bccbee44d387ab5d6a5194c5fc27c542e12Bill Wendling const unsigned SiteStartSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4); 68040121bccbee44d387ab5d6a5194c5fc27c542e12Bill Wendling const unsigned SiteLengthSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4); 68140121bccbee44d387ab5d6a5194c5fc27c542e12Bill Wendling const unsigned LandingPadSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4); 682d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling bool IsSJLJ = MAI->getExceptionHandlingType() == ExceptionHandling::SjLj; 683d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling bool HaveTTData = IsSJLJ ? (!TypeInfos.empty() || !FilterIds.empty()) : true; 68428275fdf02885587156da5cb20388b22d5b96557Bill Wendling unsigned SizeSites; 685d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling 686d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling if (IsSJLJ) 6878b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach SizeSites = 0; 688d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling else 6891b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach SizeSites = CallSites.size() * 6901b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach (SiteStartSize + SiteLengthSize + LandingPadSize); 691d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling 6921b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach for (unsigned i = 0, e = CallSites.size(); i < e; ++i) { 693af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner SizeSites += MCAsmInfo::getULEB128Size(CallSites[i].Action); 694d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling if (IsSJLJ) 695af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner SizeSites += MCAsmInfo::getULEB128Size(i); 6961b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 697d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling 698eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling // Type infos. 699d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner const MCSection *LSDASection = Asm->getObjFileLowering().getLSDASection(); 700fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling unsigned TTypeFormat; 701a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned TypeFormatSize; 702eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 70343e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling if (!HaveTTData) { 70428275fdf02885587156da5cb20388b22d5b96557Bill Wendling // For SjLj exceptions, if there is no TypeInfo, then we just explicitly say 70528275fdf02885587156da5cb20388b22d5b96557Bill Wendling // that we're omitting that bit. 706fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling TTypeFormat = dwarf::DW_EH_PE_omit; 707a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling TypeFormatSize = SizeOfEncodedValue(dwarf::DW_EH_PE_absptr); 70881c9a069377e9474d010f04eebe8325fd11429e3Chris Lattner } else { 709ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // Okay, we have actual filters or typeinfos to emit. As such, we need to 710ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // pick a type encoding for them. We're about to emit a list of pointers to 711ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // typeinfo objects at the end of the LSDA. However, unless we're in static 712ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // mode, this reference will require a relocation by the dynamic linker. 71346b754c76bd6a720dd1dd3be248cb93a4e25d3e5Chris Lattner // 714ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // Because of this, we have a couple of options: 71528275fdf02885587156da5cb20388b22d5b96557Bill Wendling // 716ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 1) If we are in -static mode, we can always use an absolute reference 717ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // from the LSDA, because the static linker will resolve it. 71828275fdf02885587156da5cb20388b22d5b96557Bill Wendling // 719ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 2) Otherwise, if the LSDA section is writable, we can output the direct 720ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // reference to the typeinfo and allow the dynamic linker to relocate 721ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // it. Since it is in a writable section, the dynamic linker won't 722ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // have a problem. 72328275fdf02885587156da5cb20388b22d5b96557Bill Wendling // 724ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 3) Finally, if we're in PIC mode and the LDSA section isn't writable, 725ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // we need to use some form of indirection. For example, on Darwin, 726ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // we can output a statically-relocatable reference to a dyld stub. The 727ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // offset to the stub is constant, but the contents are in a section 728ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // that is updated by the dynamic linker. This is easy enough, but we 729ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // need to tell the personality function of the unwinder to indirect 730ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // through the dyld stub. 731ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 73243e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling // FIXME: When (3) is actually implemented, we'll have to emit the stubs 733ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // somewhere. This predicate should be moved to a shared location that is 734ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // in target-independent code. 735ad88bc4076d088baad8a5ee9561e46ac08a1c88aChris Lattner // 736fb7634f1c7a804829fc55e3711ba62c8ade818d0Bill Wendling if (LSDASection->getKind().isWriteable() || 73743e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling Asm->TM.getRelocationModel() == Reloc::Static) 73843e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling TTypeFormat = dwarf::DW_EH_PE_absptr; 73943e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling else 74043e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling TTypeFormat = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 74143e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling dwarf::DW_EH_PE_sdata4; 742a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling 743a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling TypeFormatSize = SizeOfEncodedValue(TTypeFormat); 744fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling } 745fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 746fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling // Begin the exception table. 747fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->OutStreamer.SwitchSection(LSDASection); 748fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EmitAlignment(2, 0, 0, false); 74943e484fbcf6a40a70d9a5c7ea142f37416ef1e68Bill Wendling 750fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling O << "GCC_except_table" << SubprogramCount << ":\n"; 751a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling 752a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // The type infos need to be aligned. GCC does this by inserting padding just 753a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // before the type infos. However, this changes the size of the exception 754a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // table, so you need to take this into account when you output the exception 755a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // table size. However, the size is output using a variable length encoding. 756a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // So by increasing the size by inserting padding, you may increase the number 757a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // of bytes used for writing the size. If it increases, say by one byte, then 758a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // you now need to output one less byte of padding to get the type infos 759a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // aligned. However this decreases the size of the exception table. This 760a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // changes the value you have to output for the exception table size. Due to 761a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // the variable length encoding, the number of bytes used for writing the 762a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // length may decrease. If so, you then have to increase the amount of 763a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // padding. And so on. If you look carefully at the GCC code you will see that 764a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // it indeed does this in a loop, going on and on until the values stabilize. 765a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // We chose another solution: don't output padding inside the table like GCC 766a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling // does, instead output it before the table. 767a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned SizeTypes = TypeInfos.size() * TypeFormatSize; 768a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned TyOffset = sizeof(int8_t) + // Call site format 769a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling MCAsmInfo::getULEB128Size(SizeSites) + // Call-site table length 770a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling SizeSites + SizeActions + SizeTypes; 771a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned TotalSize = sizeof(int8_t) + // LPStart format 772a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling sizeof(int8_t) + // TType format 773a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling (HaveTTData ? 774a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling MCAsmInfo::getULEB128Size(TyOffset) : 0) + // TType base offset 775a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling TyOffset; 776a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling unsigned SizeAlign = (4 - TotalSize) & 3; 777a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling 778a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling for (unsigned i = 0; i != SizeAlign; ++i) { 779a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling Asm->EmitInt8(0); 780a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling Asm->EOL("Padding"); 781a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling } 782a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling 783fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling EmitLabel("exception", SubprogramCount); 784fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 785fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling if (IsSJLJ) { 786fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling SmallString<16> LSDAName; 787fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling raw_svector_ostream(LSDAName) << MAI->getPrivateGlobalPrefix() << 788fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling "_LSDA_" << Asm->getFunctionNumber(); 789fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling O << LSDAName.str() << ":\n"; 790fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling } 791fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 792fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling // Emit the header. 793fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EmitInt8(dwarf::DW_EH_PE_omit); 794fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EOL("@LPStart format", dwarf::DW_EH_PE_omit); 795fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 796fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EmitInt8(TTypeFormat); 797fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling Asm->EOL("@TType format", TTypeFormat); 798fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling 799fe220285b5ef1e4480ddd7f7c8bb182b88a33b16Bill Wendling if (HaveTTData) { 800a2f6449a57fcce73beacc30158aafe39b5349947Bill Wendling Asm->EmitULEB128Bytes(TyOffset); 801a583c55864e83e470333b7be878280b10e175a6eBill Wendling Asm->EOL("@TType base offset"); 8021b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 803b0d9c3e7fdc952ae7cbe169b01ccaf1b80329403Bill Wendling 80428275fdf02885587156da5cb20388b22d5b96557Bill Wendling // SjLj Exception handling 805d1a5b37a62e829e56b6225e0934a01d9f8823387Bill Wendling if (IsSJLJ) { 806639217cb6a3948800c71c39503f8def4873a535eBill Wendling Asm->EmitInt8(dwarf::DW_EH_PE_udata4); 8070734d35044c304dd072f20e49840bcbea427db9cBill Wendling Asm->EOL("Call site format", dwarf::DW_EH_PE_udata4); 8081b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitULEB128Bytes(SizeSites); 809a583c55864e83e470333b7be878280b10e175a6eBill Wendling Asm->EOL("Call site table length"); 8101b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach 8111b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach // Emit the landing pad site information. 8128b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach unsigned idx = 0; 8138b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach for (SmallVectorImpl<CallSiteEntry>::const_iterator 8148b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach I = CallSites.begin(), E = CallSites.end(); I != E; ++I, ++idx) { 8158b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach const CallSiteEntry &S = *I; 816a583c55864e83e470333b7be878280b10e175a6eBill Wendling 817a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the landing pad, counted in 16-byte bundles relative to the 818a583c55864e83e470333b7be878280b10e175a6eBill Wendling // @LPStart address. 8198b818d7e98309125c6058c4ea72a7dc73b031db2Jim Grosbach Asm->EmitULEB128Bytes(idx); 8201b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Landing pad"); 821a583c55864e83e470333b7be878280b10e175a6eBill Wendling 822a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the first associated action record, relative to the start of 823a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the action table. This value is biased by 1 (1 indicates the start of 824a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the action table), and 0 indicates that there are no actions. 8251b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitULEB128Bytes(S.Action); 8261b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Action"); 8271b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 8281b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } else { 8291b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach // DWARF Exception handling 83033adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner assert(MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf); 8311b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach 832a583c55864e83e470333b7be878280b10e175a6eBill Wendling // The call-site table is a list of all call sites that may throw an 833a583c55864e83e470333b7be878280b10e175a6eBill Wendling // exception (including C++ 'throw' statements) in the procedure 834a583c55864e83e470333b7be878280b10e175a6eBill Wendling // fragment. It immediately follows the LSDA header. Each entry indicates, 835a583c55864e83e470333b7be878280b10e175a6eBill Wendling // for a given call, the first corresponding action record and corresponding 836a583c55864e83e470333b7be878280b10e175a6eBill Wendling // landing pad. 837a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 838a583c55864e83e470333b7be878280b10e175a6eBill Wendling // The table begins with the number of bytes, stored as an LEB128 839a583c55864e83e470333b7be878280b10e175a6eBill Wendling // compressed, unsigned integer. The records immediately follow the record 840a583c55864e83e470333b7be878280b10e175a6eBill Wendling // count. They are sorted in increasing call-site address. Each record 841a583c55864e83e470333b7be878280b10e175a6eBill Wendling // indicates: 842a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 843a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * The position of the call-site. 844a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * The position of the landing pad. 845a583c55864e83e470333b7be878280b10e175a6eBill Wendling // * The first action record for that call site. 846a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 847a583c55864e83e470333b7be878280b10e175a6eBill Wendling // A missing entry in the call-site table indicates that a call is not 84828275fdf02885587156da5cb20388b22d5b96557Bill Wendling // supposed to throw. 849a583c55864e83e470333b7be878280b10e175a6eBill Wendling 850a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Emit the landing pad call site table. 851639217cb6a3948800c71c39503f8def4873a535eBill Wendling Asm->EmitInt8(dwarf::DW_EH_PE_udata4); 8520734d35044c304dd072f20e49840bcbea427db9cBill Wendling Asm->EOL("Call site format", dwarf::DW_EH_PE_udata4); 8531b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitULEB128Bytes(SizeSites); 854a583c55864e83e470333b7be878280b10e175a6eBill Wendling Asm->EOL("Call site table size"); 855eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8561b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach for (SmallVectorImpl<CallSiteEntry>::const_iterator 8575cff487665097d971067cbede1598e249f673182Bill Wendling I = CallSites.begin(), E = CallSites.end(); I != E; ++I) { 8581b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach const CallSiteEntry &S = *I; 8591b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach const char *BeginTag; 8601b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach unsigned BeginNumber; 861eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8621b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (!S.BeginLabel) { 8631b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach BeginTag = "eh_func_begin"; 8641b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach BeginNumber = SubprogramCount; 8651b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } else { 8661b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach BeginTag = "label"; 8671b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach BeginNumber = S.BeginLabel; 8681b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 869eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 870a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the call site relative to the previous call site, counted in 871a583c55864e83e470333b7be878280b10e175a6eBill Wendling // number of 16-byte bundles. The first call site is counted relative to 872a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the start of the procedure fragment. 8731b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount, 8741b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach true, true); 8751b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Region start"); 876eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8771b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (!S.EndLabel) 8781b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber, 8791b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach true); 8801b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach else 8811b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach EmitDifference("label", S.EndLabel, BeginTag, BeginNumber, true); 882eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8831b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Region length"); 884eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 885a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the landing pad, counted in 16-byte bundles relative to the 886a583c55864e83e470333b7be878280b10e175a6eBill Wendling // @LPStart address. 8871b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach if (!S.PadLabel) 8881b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitInt32(0); 8891b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach else 8901b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount, 8911b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach true, true); 892eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 8931b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Landing pad"); 894eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 895a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Offset of the first associated action record, relative to the start of 896a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the action table. This value is biased by 1 (1 indicates the start of 897a583c55864e83e470333b7be878280b10e175a6eBill Wendling // the action table), and 0 indicates that there are no actions. 8981b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EmitULEB128Bytes(S.Action); 8991b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach Asm->EOL("Action"); 9001b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach } 901eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 902eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 903a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Emit the Action Table. 9045cff487665097d971067cbede1598e249f673182Bill Wendling for (SmallVectorImpl<ActionEntry>::const_iterator 9055cff487665097d971067cbede1598e249f673182Bill Wendling I = Actions.begin(), E = Actions.end(); I != E; ++I) { 9065cff487665097d971067cbede1598e249f673182Bill Wendling const ActionEntry &Action = *I; 907a583c55864e83e470333b7be878280b10e175a6eBill Wendling 908a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Type Filter 909a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 910a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Used by the runtime to match the type of the thrown exception to the 911a583c55864e83e470333b7be878280b10e175a6eBill Wendling // type of the catch clauses or the types in the exception specification. 912a583c55864e83e470333b7be878280b10e175a6eBill Wendling 913eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitSLEB128Bytes(Action.ValueForTypeID); 914eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("TypeInfo index"); 915a583c55864e83e470333b7be878280b10e175a6eBill Wendling 916a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Action Record 917a583c55864e83e470333b7be878280b10e175a6eBill Wendling // 918a583c55864e83e470333b7be878280b10e175a6eBill Wendling // Self-relative signed displacement in bytes of the next action record, 919a583c55864e83e470333b7be878280b10e175a6eBill Wendling // or 0 if there is no next action record. 920a583c55864e83e470333b7be878280b10e175a6eBill Wendling 921eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitSLEB128Bytes(Action.NextAction); 922eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("Next action"); 923eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 924eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 92548dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling // Emit the Catch TypeInfos. 9265cff487665097d971067cbede1598e249f673182Bill Wendling for (std::vector<GlobalVariable *>::const_reverse_iterator 92701c69374b508bad0ee71cd3c49414a325238e29aBill Wendling I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) { 928fb7634f1c7a804829fc55e3711ba62c8ade818d0Bill Wendling const GlobalVariable *GV = *I; 929fb7634f1c7a804829fc55e3711ba62c8ade818d0Bill Wendling PrintRelDirective(); 930fb7634f1c7a804829fc55e3711ba62c8ade818d0Bill Wendling 931fb7634f1c7a804829fc55e3711ba62c8ade818d0Bill Wendling if (GV) { 93210b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattner O << *Asm->GetGlobalValueSymbol(GV); 933eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } else { 934049e98d641f90e90e8312d76cbf4c68908fb9d1dBill Wendling O << "0x0"; 935eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 936eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 937eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EOL("TypeInfo"); 938eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 939eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 94048dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling // Emit the Exception Specifications. 9415cff487665097d971067cbede1598e249f673182Bill Wendling for (std::vector<unsigned>::const_iterator 9425cff487665097d971067cbede1598e249f673182Bill Wendling I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) { 9435cff487665097d971067cbede1598e249f673182Bill Wendling unsigned TypeID = *I; 944eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitULEB128Bytes(TypeID); 94548dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling if (TypeID != 0) 94648dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling Asm->EOL("Exception specification"); 94748dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling else 94848dc29ef911a223a52b099604d0ccb499ecbf703Bill Wendling Asm->EOL(); 949eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling } 950eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 951eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling Asm->EmitAlignment(2, 0, 0, false); 952eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 953eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 954eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// EndModule - Emit all exception information that should come after the 955eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// content. 956eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingvoid DwarfException::EndModule() { 95733adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner if (MAI->getExceptionHandlingType() != ExceptionHandling::Dwarf) 9581b747ad8a0694b86e8d98a8b9a05ddfe74ec0cd3Jim Grosbach return; 959b4049fe8cbb38416522f7b214f028ef0b7693d21Bill Wendling 96052783c63a13d384582997684384553e6545852d3Bill Wendling if (!shouldEmitMovesModule && !shouldEmitTableModule) 96152783c63a13d384582997684384553e6545852d3Bill Wendling return; 96252783c63a13d384582997684384553e6545852d3Bill Wendling 963eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (TimePassesIsEnabled) 964eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->startTimer(); 965eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 96652783c63a13d384582997684384553e6545852d3Bill Wendling const std::vector<Function *> Personalities = MMI->getPersonalities(); 967b4049fe8cbb38416522f7b214f028ef0b7693d21Bill Wendling 96828275fdf02885587156da5cb20388b22d5b96557Bill Wendling for (unsigned I = 0, E = Personalities.size(); I < E; ++I) 96928275fdf02885587156da5cb20388b22d5b96557Bill Wendling EmitCIE(Personalities[I], I); 970eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 97152783c63a13d384582997684384553e6545852d3Bill Wendling for (std::vector<FunctionEHFrameInfo>::iterator 97252783c63a13d384582997684384553e6545852d3Bill Wendling I = EHFrames.begin(), E = EHFrames.end(); I != E; ++I) 97352783c63a13d384582997684384553e6545852d3Bill Wendling EmitFDE(*I); 974eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 975eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (TimePassesIsEnabled) 976eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->stopTimer(); 977eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 978eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 97928275fdf02885587156da5cb20388b22d5b96557Bill Wendling/// BeginFunction - Gather pre-function exception information. Assumes it's 98028275fdf02885587156da5cb20388b22d5b96557Bill Wendling/// being emitted immediately after the function entry point. 981eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingvoid DwarfException::BeginFunction(MachineFunction *MF) { 98273c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling if (!MMI || !MAI->doesSupportExceptionHandling()) return; 98373c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling 984eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (TimePassesIsEnabled) 985eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->startTimer(); 986eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 987eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling this->MF = MF; 988eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling shouldEmitTable = shouldEmitMoves = false; 989eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 99073c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling // Map all labels and get rid of any dead landing pads. 99173c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling MMI->TidyLandingPads(); 992eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 99373c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling // If any landing pads survive, we need an EH table. 99473c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling if (!MMI->getLandingPads().empty()) 99573c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling shouldEmitTable = true; 996eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 99773c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling // See if we need frame move info. 99873c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling if (!MF->getFunction()->doesNotThrow() || UnwindTablesMandatory) 99973c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling shouldEmitMoves = true; 1000eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 100173c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling if (shouldEmitMoves || shouldEmitTable) 100273c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling // Assumes in correct section after the entry point. 100373c5a6172508e957d0b1a46170cb070dce6cac4fBill Wendling EmitLabel("eh_func_begin", ++SubprogramCount); 1004eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1005eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling shouldEmitTableModule |= shouldEmitTable; 1006eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling shouldEmitMovesModule |= shouldEmitMoves; 1007eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1008eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling if (TimePassesIsEnabled) 1009eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->stopTimer(); 1010eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 1011eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 1012eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// EndFunction - Gather and emit post-function exception information. 1013eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling/// 1014eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendlingvoid DwarfException::EndFunction() { 10157b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling if (!shouldEmitMoves && !shouldEmitTable) return; 10167b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling 1017dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher if (TimePassesIsEnabled) 1018eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->startTimer(); 1019eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 10207b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling EmitLabel("eh_func_end", SubprogramCount); 10217b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling EmitExceptionTable(); 10227b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling 10237a2ba94d03b43f41b54872dacd7b2250dde4c7bdChris Lattner const MCSymbol *FunctionEHSym = 10247a2ba94d03b43f41b54872dacd7b2250dde4c7bdChris Lattner Asm->GetSymbolWithGlobalValueBase(MF->getFunction(), ".eh", 10257a2ba94d03b43f41b54872dacd7b2250dde4c7bdChris Lattner Asm->MAI->is_EHSymbolPrivate()); 102625d812bd7d1f58f2ba1b598b1425a2e146e27381Chris Lattner 10277b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling // Save EH frame information 10287a2ba94d03b43f41b54872dacd7b2250dde4c7bdChris Lattner EHFrames.push_back(FunctionEHFrameInfo(FunctionEHSym, SubprogramCount, 10297b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling MMI->getPersonalityIndex(), 10307b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling MF->getFrameInfo()->hasCalls(), 10317b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling !MMI->getLandingPads().empty(), 10327b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling MMI->getFrameMoves(), 10337b09a6c62215e5ed30443b0d2b2a5ae18b89b94fBill Wendling MF->getFunction())); 1034eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling 103552783c63a13d384582997684384553e6545852d3Bill Wendling // Record if this personality index uses a landing pad. 103652783c63a13d384582997684384553e6545852d3Bill Wendling UsesLSDA[MMI->getPersonalityIndex()] |= !MMI->getLandingPads().empty(); 103752783c63a13d384582997684384553e6545852d3Bill Wendling 1038dbfcdb976367ad5a9d3541fef90cd9f8dde7e2b4Eric Christopher if (TimePassesIsEnabled) 1039eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling ExceptionTimer->stopTimer(); 1040eb9072195ca7d777a71194dcaaaa369d82f24f53Bill Wendling} 1041