MCDwarf.cpp revision 203576aa0cb9d8bf2d2e4d910ebab4b7a63262ae
17cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby//===- lib/MC/MCDwarf.cpp - MCDwarf implementation ------------------------===// 27cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby// 37cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby// The LLVM Compiler Infrastructure 47cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby// 57cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby// This file is distributed under the University of Illinois Open Source 67cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby// License. See LICENSE.TXT for details. 77cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby// 87cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby//===----------------------------------------------------------------------===// 97cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby 107cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby#include "llvm/MC/MCDwarf.h" 11e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng#include "llvm/MC/MCAsmInfo.h" 12e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng#include "llvm/MC/MCContext.h" 13e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng#include "llvm/MC/MCObjectFileInfo.h" 14e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng#include "llvm/MC/MCObjectWriter.h" 15e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng#include "llvm/MC/MCRegisterInfo.h" 16ad8aaa069cfdb3bdc32b1becc8881f67b5272e14Rafael Espindola#include "llvm/MC/MCStreamer.h" 17c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCSymbol.h" 18c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCExpr.h" 197cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby#include "llvm/Support/Debug.h" 20fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola#include "llvm/Support/ErrorHandling.h" 217cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby#include "llvm/Support/raw_ostream.h" 222b2dc7c4bee01071410df0e3027117b47ce48cedBill Wendling#include "llvm/ADT/FoldingSet.h" 232b2dc7c4bee01071410df0e3027117b47ce48cedBill Wendling#include "llvm/ADT/SmallString.h" 242b2dc7c4bee01071410df0e3027117b47ce48cedBill Wendling#include "llvm/ADT/StringExtras.h" 252b2dc7c4bee01071410df0e3027117b47ce48cedBill Wendling#include "llvm/ADT/Twine.h" 267cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderbyusing namespace llvm; 277cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby 28c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Given a special op, return the address skip amount (in units of 29c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// DWARF2_LINE_MIN_INSN_LENGTH. 30c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) 31c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 32c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// The maximum address skip amount that can be encoded with a special op. 33c3882164cbf794dbe21816a2946a31bc9e02a419Bill Wendling#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) 34c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 35c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// First special line opcode - leave room for the standard opcodes. 36c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Note: If you want to change this, you'll have to update the 37c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// "standard_opcode_lengths" table that is emitted in DwarfFileTable::Emit(). 38c3882164cbf794dbe21816a2946a31bc9e02a419Bill Wendling#define DWARF2_LINE_OPCODE_BASE 13 39c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 40c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Minimum line offset in a special line info. opcode. This value 41c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// was chosen to give a reasonable range of values. 42c3882164cbf794dbe21816a2946a31bc9e02a419Bill Wendling#define DWARF2_LINE_BASE -5 43c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 44c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Range of line offsets in a special line info. opcode. 45c3882164cbf794dbe21816a2946a31bc9e02a419Bill Wendling#define DWARF2_LINE_RANGE 14 46c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 47c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Define the architecture-dependent minimum instruction length (in bytes). 48c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This value should be rather too small than too big. 49c3882164cbf794dbe21816a2946a31bc9e02a419Bill Wendling#define DWARF2_LINE_MIN_INSN_LENGTH 1 50c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 51c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Note: when DWARF2_LINE_MIN_INSN_LENGTH == 1 which is the current setting, 52c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// this routine is a nop and will be optimized away. 53a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendlingstatic inline uint64_t ScaleAddrDelta(uint64_t AddrDelta) { 54c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (DWARF2_LINE_MIN_INSN_LENGTH == 1) 55c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return AddrDelta; 56c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (AddrDelta % DWARF2_LINE_MIN_INSN_LENGTH != 0) { 57c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // TODO: report this error, but really only once. 58c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby ; 59c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 60c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return AddrDelta / DWARF2_LINE_MIN_INSN_LENGTH; 61c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 62c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 63c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 64c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This is called when an instruction is assembled into the specified section 65c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// and if there is information from the last .loc directive that has yet to have 66c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// a line entry made for it is made. 67c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 68195a0ce484cd12a5adae9184188f6d0fb52b84c0Rafael Espindolavoid MCLineEntry::Make(MCStreamer *MCOS, const MCSection *Section) { 69c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (!MCOS->getContext().getDwarfLocSeen()) 70c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 71c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 72c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol at in the current section for use in the line entry. 73c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCSymbol *LineSym = MCOS->getContext().CreateTempSymbol(); 74c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Set the value of the symbol to use for the MCLineEntry. 75c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(LineSym); 76c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 77c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Get the current .loc info saved in the context. 78c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCDwarfLoc &DwarfLoc = MCOS->getContext().getCurrentDwarfLoc(); 79c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 80c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a (local) line entry with the symbol and the current .loc info. 81c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCLineEntry LineEntry(LineSym, DwarfLoc); 82c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 83c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // clear DwarfLocSeen saying the current .loc info is now used. 843f55c24df9527de345f6cc960944840a7a101c6aKevin Enderby MCOS->getContext().ClearDwarfLocSeen(); 85c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 86c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Get the MCLineSection for this section, if one does not exist for this 87c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // section create it. 8817fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const DenseMap<const MCSection *, MCLineSection *> &MCLineSections = 89c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->getContext().getMCLineSections(); 9017fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola MCLineSection *LineSection = MCLineSections.lookup(Section); 91c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (!LineSection) { 92c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a new MCLineSection. This will be deleted after the dwarf line 93c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // table is created using it by iterating through the MCLineSections 94c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // DenseMap. 95c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LineSection = new MCLineSection; 96c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Save a pointer to the new LineSection into the MCLineSections DenseMap. 9717fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola MCOS->getContext().addMCLineSection(Section, LineSection); 98c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 99c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 100c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Add the line entry to this section's entries. 101c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LineSection->addLineEntry(LineEntry); 102c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 103c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 104c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 105c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This helper routine returns an expression of End - Start + IntVal . 106c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 1075fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindolastatic inline const MCExpr *MakeStartMinusEndExpr(const MCStreamer &MCOS, 1085fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola const MCSymbol &Start, 1095fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola const MCSymbol &End, 1105fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola int IntVal) { 111c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 112c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *Res = 1135fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCSymbolRefExpr::Create(&End, Variant, MCOS.getContext()); 114c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *RHS = 1155fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCSymbolRefExpr::Create(&Start, Variant, MCOS.getContext()); 116c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *Res1 = 1175fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCBinaryExpr::Create(MCBinaryExpr::Sub, Res, RHS, MCOS.getContext()); 118c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *Res2 = 1195fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCConstantExpr::Create(IntVal, MCOS.getContext()); 120c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *Res3 = 1215fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCBinaryExpr::Create(MCBinaryExpr::Sub, Res1, Res2, MCOS.getContext()); 122c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return Res3; 123c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 124c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 125c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 126c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This emits the Dwarf line table for the specified section from the entries 127c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// in the LineSection. 128c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 129195a0ce484cd12a5adae9184188f6d0fb52b84c0Rafael Espindolastatic inline void EmitDwarfLineTable(MCStreamer *MCOS, 130c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCSection *Section, 13189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCLineSection *LineSection) { 132c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned FileNum = 1; 133c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned LastLine = 1; 134c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned Column = 0; 135c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; 136c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned Isa = 0; 137c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCSymbol *LastLabel = NULL; 138c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 139c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Loop through each MCLineEntry and encode the dwarf line number table. 14017fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola for (MCLineSection::const_iterator 141c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby it = LineSection->getMCLineEntries()->begin(), 142c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby ie = LineSection->getMCLineEntries()->end(); it != ie; ++it) { 143c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 144c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (FileNum != it->getFileNum()) { 145c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby FileNum = it->getFileNum(); 146c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_file, 1); 1473ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola MCOS->EmitULEB128IntValue(FileNum); 148c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 149c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Column != it->getColumn()) { 150c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Column = it->getColumn(); 151c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_column, 1); 1523ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola MCOS->EmitULEB128IntValue(Column); 153c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 154c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Isa != it->getIsa()) { 155c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Isa = it->getIsa(); 156c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_isa, 1); 1573ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola MCOS->EmitULEB128IntValue(Isa); 158c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 159c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if ((it->getFlags() ^ Flags) & DWARF2_FLAG_IS_STMT) { 160c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Flags = it->getFlags(); 161c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_negate_stmt, 1); 162c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 163c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (it->getFlags() & DWARF2_FLAG_BASIC_BLOCK) 164c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_basic_block, 1); 165c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (it->getFlags() & DWARF2_FLAG_PROLOGUE_END) 166c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_prologue_end, 1); 167c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (it->getFlags() & DWARF2_FLAG_EPILOGUE_BEGIN) 168c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_epilogue_begin, 1); 169c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 17064185cc6090f695c4f97c51cf2adc731f56d1a20Rafael Espindola int64_t LineDelta = static_cast<int64_t>(it->getLine()) - LastLine; 171c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCSymbol *Label = it->getLabel(); 172c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 173c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // At this point we want to emit/create the sequence to encode the delta in 174c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // line numbers and the increment of the address from the previous Label 175c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // and the current Label. 1761be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng const MCAsmInfo &asmInfo = MCOS->getContext().getAsmInfo(); 177672b93a3324cc1da6d374eed4c75c050a9cad7beEvan Cheng MCOS->EmitDwarfAdvanceLineAddr(LineDelta, LastLabel, Label, 178672b93a3324cc1da6d374eed4c75c050a9cad7beEvan Cheng asmInfo.getPointerSize()); 179c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 180c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LastLine = it->getLine(); 181c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LastLabel = Label; 182c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 183c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 184c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Emit a DW_LNE_end_sequence for the end of the section. 185c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Using the pointer Section create a temporary label at the end of the 186c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // section and use that and the LastLabel to compute the address delta 187c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // and use INT64_MAX as the line delta which is the signal that this is 188c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // actually a DW_LNE_end_sequence. 189c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 190c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Switch to the section to be able to create a symbol at its end. 191c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->SwitchSection(Section); 19289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 19389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = MCOS->getContext(); 194c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol at the end of the section. 19589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *SectionEnd = context.CreateTempSymbol(); 196c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Set the value of the symbol, as we are at the end of the section. 197c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(SectionEnd); 198c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 199c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Switch back the the dwarf line section. 200e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfLineSection()); 201195a0ce484cd12a5adae9184188f6d0fb52b84c0Rafael Espindola 2021be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng const MCAsmInfo &asmInfo = MCOS->getContext().getAsmInfo(); 203672b93a3324cc1da6d374eed4c75c050a9cad7beEvan Cheng MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd, 204672b93a3324cc1da6d374eed4c75c050a9cad7beEvan Cheng asmInfo.getPointerSize()); 205c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 206c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 207c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 208c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This emits the Dwarf file and the line tables. 209c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 21089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindolavoid MCDwarfFileTable::Emit(MCStreamer *MCOS) { 21189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = MCOS->getContext(); 212c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Switch to the section where the table will be emitted into. 213e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfLineSection()); 214c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 215c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol at the beginning of this section. 21689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *LineStartSym = context.CreateTempSymbol(); 217c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Set the value of the symbol, as we are at the start of the section. 218c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(LineStartSym); 219c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 220c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol for the end of the section (to be set when we get there). 22189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *LineEndSym = context.CreateTempSymbol(); 222c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 223c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // The first 4 bytes is the total length of the information for this 224c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // compilation unit (not including these 4 bytes for the length). 2255fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCOS->EmitAbsValue(MakeStartMinusEndExpr(*MCOS, *LineStartSym, *LineEndSym,4), 2260bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola 4); 227c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 228c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Next 2 bytes is the Version, which is Dwarf 2. 229c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(2, 2); 230c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 231c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol for the end of the prologue (to be set when we get there). 23289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *ProEndSym = context.CreateTempSymbol(); // Lprologue_end 233c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 234c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Length of the prologue, is the next 4 bytes. Which is the start of the 235c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // section to the end of the prologue. Not including the 4 bytes for the 236c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // total length, the 2 bytes for the version, and these 4 bytes for the 237c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // length of the prologue. 2385fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCOS->EmitAbsValue(MakeStartMinusEndExpr(*MCOS, *LineStartSym, *ProEndSym, 239c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby (4 + 2 + 4)), 2405d4918dbd116b0b5e561c431b1ea527ee1b9302aRafael Espindola 4, 0); 241c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 242c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Parameters of the state machine, are next. 243c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_MIN_INSN_LENGTH, 1); 244c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_DEFAULT_IS_STMT, 1); 245c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_BASE, 1); 246c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_RANGE, 1); 247c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_OPCODE_BASE, 1); 248c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 249c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Standard opcode lengths 250c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_copy 251c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_advance_pc 252c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_advance_line 253c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_set_file 254c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_set_column 255c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_negate_stmt 256c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_basic_block 257c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_const_add_pc 258c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_fixed_advance_pc 259c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_prologue_end 260c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_epilogue_begin 261c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // DW_LNS_set_isa 262c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 263c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Put out the directory and file tables. 264c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 265c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // First the directory table. 266c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const std::vector<StringRef> &MCDwarfDirs = 26789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola context.getMCDwarfDirs(); 268c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby for (unsigned i = 0; i < MCDwarfDirs.size(); i++) { 269c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(MCDwarfDirs[i], 0); // the DirectoryName 270c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(StringRef("\0", 1), 0); // the null term. of the string 271c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 272c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // Terminate the directory list 273c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 274c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Second the file table. 275c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const std::vector<MCDwarfFile *> &MCDwarfFiles = 276c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->getContext().getMCDwarfFiles(); 277c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby for (unsigned i = 1; i < MCDwarfFiles.size(); i++) { 278c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(MCDwarfFiles[i]->getName(), 0); // FileName 279c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(StringRef("\0", 1), 0); // the null term. of the string 2803ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola // the Directory num 2813ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola MCOS->EmitULEB128IntValue(MCDwarfFiles[i]->getDirIndex()); 282c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // last modification timestamp (always 0) 283c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // filesize (always 0) 284c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 285c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // Terminate the file list 286c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 287c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // This is the end of the prologue, so set the value of the symbol at the 288c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // end of the prologue (that was used in a previous expression). 289c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(ProEndSym); 290c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 291c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Put out the line tables. 29217fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const DenseMap<const MCSection *, MCLineSection *> &MCLineSections = 293c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->getContext().getMCLineSections(); 29417fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const std::vector<const MCSection *> &MCLineSectionOrder = 29517fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola MCOS->getContext().getMCLineSectionOrder(); 29617fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola for (std::vector<const MCSection*>::const_iterator it = 297c3882164cbf794dbe21816a2946a31bc9e02a419Bill Wendling MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie; 29817fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola ++it) { 29917fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const MCSection *Sec = *it; 30017fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const MCLineSection *Line = MCLineSections.lookup(Sec); 30189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola EmitDwarfLineTable(MCOS, Sec, Line); 302c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 303c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Now delete the MCLineSections that were created in MCLineEntry::Make() 304c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // and used to emit the line table. 30517fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola delete Line; 306c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 307c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 308767b1be3900bdc693aa0ad3e554ba034845f67f7Rafael Espindola if (MCOS->getContext().getAsmInfo().getLinkerRequiresNonEmptyDwarfLines() 309767b1be3900bdc693aa0ad3e554ba034845f67f7Rafael Espindola && MCLineSectionOrder.begin() == MCLineSectionOrder.end()) { 310a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // The darwin9 linker has a bug (see PR8715). For for 32-bit architectures 311a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // it requires: 312a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // total_length >= prologue_length + 10 313a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // We are 4 bytes short, since we have total_length = 51 and 314a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // prologue_length = 45 315a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola 316a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // The regular end_sequence should be sufficient. 317a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0); 3185113cdbfff7df4c7a79a92e5aa971126254202c6Devang Patel } 3195113cdbfff7df4c7a79a92e5aa971126254202c6Devang Patel 320c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // This is the end of the section, so set the value of the symbol at the end 321c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // of this section (that was used in a previous expression). 322c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(LineEndSym); 323c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 324c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 325c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby/// Utility function to write the encoding to an object writer. 326c095793b4ab027181605c79c9808df12afe45d63Kevin Enderbyvoid MCDwarfLineAddr::Write(MCObjectWriter *OW, int64_t LineDelta, 327c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby uint64_t AddrDelta) { 328c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<256> Tmp; 329c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OS(Tmp); 330c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS); 331c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OW->WriteBytes(OS.str()); 332c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 333c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 334c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby/// Utility function to emit the encoding to a streamer. 335195a0ce484cd12a5adae9184188f6d0fb52b84c0Rafael Espindolavoid MCDwarfLineAddr::Emit(MCStreamer *MCOS, int64_t LineDelta, 336c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby uint64_t AddrDelta) { 337c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<256> Tmp; 338c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OS(Tmp); 339c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS); 340c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(OS.str(), /*AddrSpace=*/0); 341c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 342c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 343c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby/// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas. 344c095793b4ab027181605c79c9808df12afe45d63Kevin Enderbyvoid MCDwarfLineAddr::Encode(int64_t LineDelta, uint64_t AddrDelta, 345c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_ostream &OS) { 346c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby uint64_t Temp, Opcode; 347c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby bool NeedCopy = false; 348c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 349c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Scale the address delta by the minimum instruction length. 350c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby AddrDelta = ScaleAddrDelta(AddrDelta); 351c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 352c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // A LineDelta of INT64_MAX is a signal that this is actually a 353c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // DW_LNE_end_sequence. We cannot use special opcodes here, since we want the 354c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // end_sequence to emit the matrix entry. 355c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (LineDelta == INT64_MAX) { 356c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (AddrDelta == MAX_SPECIAL_ADDR_DELTA) 357c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_const_add_pc); 358c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby else { 359c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_advance_pc); 360dcf0e0c44b0bf0634b2f833369b840c18ac8a5f0Benjamin Kramer MCObjectWriter::EncodeULEB128(AddrDelta, OS); 361c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 362c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_extended_op); 363c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(1); 364c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNE_end_sequence); 365c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 366c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 367c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 368c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Bias the line delta by the base. 369c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Temp = LineDelta - DWARF2_LINE_BASE; 370c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 371c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // If the line increment is out of range of a special opcode, we must encode 372c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // it with DW_LNS_advance_line. 373c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Temp >= DWARF2_LINE_RANGE) { 374c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_advance_line); 375c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<32> Tmp; 376c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OSE(Tmp); 377c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCObjectWriter::EncodeSLEB128(LineDelta, OSE); 378c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << OSE.str(); 379c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 380c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LineDelta = 0; 381c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Temp = 0 - DWARF2_LINE_BASE; 382c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby NeedCopy = true; 383c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 384c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 385c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Use DW_LNS_copy instead of a "line +0, addr +0" special opcode. 386c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (LineDelta == 0 && AddrDelta == 0) { 387c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_copy); 388c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 389c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 390c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 391c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Bias the opcode by the special opcode base. 392c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Temp += DWARF2_LINE_OPCODE_BASE; 393c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 394c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Avoid overflow when addr_delta is large. 395c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (AddrDelta < 256 + MAX_SPECIAL_ADDR_DELTA) { 396c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Try using a special opcode. 397c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Opcode = Temp + AddrDelta * DWARF2_LINE_RANGE; 398c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Opcode <= 255) { 399c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(Opcode); 400c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 401c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 402c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 403c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Try using DW_LNS_const_add_pc followed by special op. 404c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Opcode = Temp + (AddrDelta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; 405c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Opcode <= 255) { 406c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_const_add_pc); 407c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(Opcode); 408c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 409c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 410c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 411c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 412c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Otherwise use DW_LNS_advance_pc. 413c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_advance_pc); 414c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<32> Tmp; 415c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OSE(Tmp); 416c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCObjectWriter::EncodeULEB128(AddrDelta, OSE); 417c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << OSE.str(); 418c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 419c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (NeedCopy) 420c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_copy); 421c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby else 422c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(Temp); 423c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 424c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 4257cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderbyvoid MCDwarfFile::print(raw_ostream &OS) const { 4267cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby OS << '"' << getName() << '"'; 4277cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby} 4287cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby 4297cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderbyvoid MCDwarfFile::dump() const { 4307cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby print(dbgs()); 4317cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby} 432c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 43389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindolastatic int getDataAlignmentFactor(MCStreamer &streamer) { 43489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = streamer.getContext(); 4351be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng const MCAsmInfo &asmInfo = context.getAsmInfo(); 43689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola int size = asmInfo.getPointerSize(); 4371be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng if (asmInfo.isStackGrowthDirectionUp()) 43889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola return size; 4391be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng else 4401be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng return -size; 44189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 44289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 443abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindolastatic unsigned getSizeForEncoding(MCStreamer &streamer, 444abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindola unsigned symbolEncoding) { 44525f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola MCContext &context = streamer.getContext(); 44625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola unsigned format = symbolEncoding & 0x0f; 44725f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola switch (format) { 44825f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola default: 44925f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola assert(0 && "Unknown Encoding"); 45025f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case dwarf::DW_EH_PE_absptr: 45125f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case dwarf::DW_EH_PE_signed: 4521be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng return context.getAsmInfo().getPointerSize(); 45325f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case dwarf::DW_EH_PE_udata2: 45425f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case dwarf::DW_EH_PE_sdata2: 455abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindola return 2; 45625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case dwarf::DW_EH_PE_udata4: 45725f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case dwarf::DW_EH_PE_sdata4: 458abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindola return 4; 45925f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case dwarf::DW_EH_PE_udata8: 46025f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case dwarf::DW_EH_PE_sdata8: 461abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindola return 8; 46225f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola } 463abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindola} 464abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindola 465abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindolastatic void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol, 4662541c41f3e2af94585e14353a91f02facd65e415Bill Wendling unsigned symbolEncoding, const char *comment = 0) { 467a0057ca13f06b8de08483c3e3a143a7236c67097Rafael Espindola MCContext &context = streamer.getContext(); 468a0057ca13f06b8de08483c3e3a143a7236c67097Rafael Espindola const MCAsmInfo &asmInfo = context.getAsmInfo(); 469a0057ca13f06b8de08483c3e3a143a7236c67097Rafael Espindola const MCExpr *v = asmInfo.getExprForFDESymbol(&symbol, 470debd7e4e8bc5cfe61bfb71835ce2b1a3fbccc2beRafael Espindola symbolEncoding, 471a0057ca13f06b8de08483c3e3a143a7236c67097Rafael Espindola streamer); 472abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindola unsigned size = getSizeForEncoding(streamer, symbolEncoding); 4732541c41f3e2af94585e14353a91f02facd65e415Bill Wendling if (streamer.isVerboseAsm() && comment) streamer.AddComment(comment); 474debd7e4e8bc5cfe61bfb71835ce2b1a3fbccc2beRafael Espindola streamer.EmitAbsValue(v, size); 47525f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola} 47625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola 477bfa27cc5d72e061a96efbb461864d40bc8089ec2Rafael Espindolastatic void EmitPersonality(MCStreamer &streamer, const MCSymbol &symbol, 478bfa27cc5d72e061a96efbb461864d40bc8089ec2Rafael Espindola unsigned symbolEncoding) { 479bfa27cc5d72e061a96efbb461864d40bc8089ec2Rafael Espindola MCContext &context = streamer.getContext(); 480bfa27cc5d72e061a96efbb461864d40bc8089ec2Rafael Espindola const MCAsmInfo &asmInfo = context.getAsmInfo(); 481debd7e4e8bc5cfe61bfb71835ce2b1a3fbccc2beRafael Espindola const MCExpr *v = asmInfo.getExprForPersonalitySymbol(&symbol, 482debd7e4e8bc5cfe61bfb71835ce2b1a3fbccc2beRafael Espindola symbolEncoding, 483debd7e4e8bc5cfe61bfb71835ce2b1a3fbccc2beRafael Espindola streamer); 484bfa27cc5d72e061a96efbb461864d40bc8089ec2Rafael Espindola unsigned size = getSizeForEncoding(streamer, symbolEncoding); 485debd7e4e8bc5cfe61bfb71835ce2b1a3fbccc2beRafael Espindola streamer.EmitValue(v, size); 486bfa27cc5d72e061a96efbb461864d40bc8089ec2Rafael Espindola} 487bfa27cc5d72e061a96efbb461864d40bc8089ec2Rafael Espindola 48825f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindolastatic const MachineLocation TranslateMachineLocation( 4890e6a052331f674dd70e28af41f654a7874405eabEvan Cheng const MCRegisterInfo &MRI, 49025f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MachineLocation &Loc) { 49125f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola unsigned Reg = Loc.getReg() == MachineLocation::VirtualFP ? 49225f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola MachineLocation::VirtualFP : 4930e6a052331f674dd70e28af41f654a7874405eabEvan Cheng unsigned(MRI.getDwarfRegNum(Loc.getReg(), true)); 49425f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MachineLocation &NewLoc = Loc.isReg() ? 49525f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola MachineLocation(Reg) : MachineLocation(Reg, Loc.getOffset()); 49625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola return NewLoc; 49725f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola} 49825f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola 49925f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindolanamespace { 50025f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola class FrameEmitterImpl { 50125f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola int CFAOffset; 502514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola int CIENum; 5035426a9ee37667660935d80841c5392d78e254318Rafael Espindola bool UsingCFI; 50440a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola bool IsEH; 505e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola const MCSymbol *SectionStart; 50625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola public: 507e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola FrameEmitterImpl(bool usingCFI, bool isEH, const MCSymbol *sectionStart) : 508e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH), 509e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola SectionStart(sectionStart) { 51025f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola } 51125f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola 512e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling /// EmitCompactUnwind - Emit the unwind information in a compact way. If 513e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling /// we're successful, return 'true'. Otherwise, return 'false' and it will 514e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling /// emit the normal CIE and FDE. 515e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling bool EmitCompactUnwind(MCStreamer &streamer, 516e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling const MCDwarfFrameInfo &frame); 517e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling 51825f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCSymbol &EmitCIE(MCStreamer &streamer, 51925f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCSymbol *personality, 52025f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola unsigned personalityEncoding, 52125f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCSymbol *lsda, 52225f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola unsigned lsdaEncoding); 52325f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola MCSymbol *EmitFDE(MCStreamer &streamer, 52425f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCSymbol &cieStart, 5259f270dadd429771dded5a8572da8c74513771c15Rafael Espindola const MCDwarfFrameInfo &frame); 52625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola void EmitCFIInstructions(MCStreamer &streamer, 52725f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const std::vector<MCCFIInstruction> &Instrs, 52825f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola MCSymbol *BaseLabel); 52925f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola void EmitCFIInstruction(MCStreamer &Streamer, 53025f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCCFIInstruction &Instr); 53125f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola }; 5323c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling 5333c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling} // end anonymous namespace 5343c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling 5353c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendlingstatic void EmitEncodingByte(MCStreamer &Streamer, unsigned Encoding, 5363c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling StringRef Prefix) { 5373c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (Streamer.isVerboseAsm()) { 5383c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling const char *EncStr = 0; 5393c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling switch (Encoding) { 5403c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling default: EncStr = "<unknown encoding>"; 5413c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_absptr: EncStr = "absptr"; 5423c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_omit: EncStr = "omit"; 5433c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_pcrel: EncStr = "pcrel"; 5443c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_udata4: EncStr = "udata4"; 5453c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_udata8: EncStr = "udata8"; 5463c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_sdata4: EncStr = "sdata4"; 5473c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_sdata8: EncStr = "sdata8"; 5483c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4: EncStr = "pcrel udata4"; 5493c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4: EncStr = "pcrel sdata4"; 5503c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8: EncStr = "pcrel udata8"; 5513c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8: EncStr = "pcrel sdata8"; 5523c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata4: 5533c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling EncStr = "indirect pcrel udata4"; 5543c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata4: 5553c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling EncStr = "indirect pcrel sdata4"; 5563c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata8: 5573c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling EncStr = "indirect pcrel udata8"; 5583c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata8: 5593c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling EncStr = "indirect pcrel sdata8"; 5603c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling } 5613c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling 5623c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling Streamer.AddComment(Twine(Prefix) + " = " + EncStr); 5633c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling } 5643c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling 5653c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling Streamer.EmitIntValue(Encoding, 1); 56625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola} 56725f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola 56825f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindolavoid FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer, 56925f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCCFIInstruction &Instr) { 570fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola int dataAlignmentFactor = getDataAlignmentFactor(Streamer); 571efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling bool VerboseAsm = Streamer.isVerboseAsm(); 57289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 573fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola switch (Instr.getOperation()) { 57425f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case MCCFIInstruction::Move: 57525f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola case MCCFIInstruction::RelMove: { 576fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola const MachineLocation &Dst = Instr.getDestination(); 577fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola const MachineLocation &Src = Instr.getSource(); 5785d7dcd3335234d2a2bc16dc69f86fbb5dcaa8962Rafael Espindola const bool IsRelative = Instr.getOperation() == MCCFIInstruction::RelMove; 57989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 58089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // If advancing cfa. 58189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) { 58289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Src.getReg() == MachineLocation::VirtualFP) { 583efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_offset"); 584fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1); 58589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } else { 586efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa"); 587fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1); 588efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + 589efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling Twine(Src.getReg())); 590b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola Streamer.EmitULEB128IntValue(Src.getReg()); 59189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 59289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 5935d7dcd3335234d2a2bc16dc69f86fbb5dcaa8962Rafael Espindola if (IsRelative) 5945d7dcd3335234d2a2bc16dc69f86fbb5dcaa8962Rafael Espindola CFAOffset += Src.getOffset(); 5955d7dcd3335234d2a2bc16dc69f86fbb5dcaa8962Rafael Espindola else 5965d7dcd3335234d2a2bc16dc69f86fbb5dcaa8962Rafael Espindola CFAOffset = -Src.getOffset(); 5975d7dcd3335234d2a2bc16dc69f86fbb5dcaa8962Rafael Espindola 598efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Offset " + Twine(CFAOffset))); 599e8cfbd843d737e1f95c3032c7670c2be3838a6f6Rafael Espindola Streamer.EmitULEB128IntValue(CFAOffset); 600fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola return; 60189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 60289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 60389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) { 60489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola assert(Dst.isReg() && "Machine move not supported yet."); 605efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_register"); 606fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1); 607efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Dst.getReg())); 608b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola Streamer.EmitULEB128IntValue(Dst.getReg()); 609fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola return; 61089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 61189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 612b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola unsigned Reg = Src.getReg(); 61325f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola int Offset = Dst.getOffset(); 61425f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola if (IsRelative) 61525f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola Offset -= CFAOffset; 61625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola Offset = Offset / dataAlignmentFactor; 61789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 61889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Offset < 0) { 619efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended_sf"); 620fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1); 621efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg)); 622fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitULEB128IntValue(Reg); 623efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset)); 624fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitSLEB128IntValue(Offset); 62589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } else if (Reg < 64) { 626e08d4335ad29d74008222b4d7ac91c153ed66becBill Wendling if (VerboseAsm) Streamer.AddComment(Twine("DW_CFA_offset + Reg(") + 627e08d4335ad29d74008222b4d7ac91c153ed66becBill Wendling Twine(Reg) + ")"); 628fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1); 629efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset)); 630eccbad78e0854743e358841b64f9e0f5eba82861Rafael Espindola Streamer.EmitULEB128IntValue(Offset); 63189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } else { 632efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended"); 633fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1); 634efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg)); 635eccbad78e0854743e358841b64f9e0f5eba82861Rafael Espindola Streamer.EmitULEB128IntValue(Reg); 636efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset)); 637eccbad78e0854743e358841b64f9e0f5eba82861Rafael Espindola Streamer.EmitULEB128IntValue(Offset); 638fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola } 639fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola return; 640fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola } 641fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola case MCCFIInstruction::Remember: 642efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment("DW_CFA_remember_state"); 643fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_remember_state, 1); 644fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola return; 645fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola case MCCFIInstruction::Restore: 646efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment("DW_CFA_restore_state"); 647fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_restore_state, 1); 648fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola return; 649c57543964d1382d3d3a5005f415b6c0f49671b3aRafael Espindola case MCCFIInstruction::SameValue: { 650c57543964d1382d3d3a5005f415b6c0f49671b3aRafael Espindola unsigned Reg = Instr.getDestination().getReg(); 651efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment("DW_CFA_same_value"); 652c57543964d1382d3d3a5005f415b6c0f49671b3aRafael Espindola Streamer.EmitIntValue(dwarf::DW_CFA_same_value, 1); 653efd24ddbffc1e69fa88089de036d1873c950dfb5Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg)); 654e8cfbd843d737e1f95c3032c7670c2be3838a6f6Rafael Espindola Streamer.EmitULEB128IntValue(Reg); 655c57543964d1382d3d3a5005f415b6c0f49671b3aRafael Espindola return; 656c57543964d1382d3d3a5005f415b6c0f49671b3aRafael Espindola } 657fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola } 658fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola llvm_unreachable("Unhandled case in switch"); 659fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola} 660fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola 661fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola/// EmitFrameMoves - Emit frame instructions to describe the layout of the 662fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola/// frame. 66325f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindolavoid FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer, 66425f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const std::vector<MCCFIInstruction> &Instrs, 66525f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola MCSymbol *BaseLabel) { 666fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola for (unsigned i = 0, N = Instrs.size(); i < N; ++i) { 667fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola const MCCFIInstruction &Instr = Instrs[i]; 668fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola MCSymbol *Label = Instr.getLabel(); 669fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola // Throw out move if the label is invalid. 670fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola if (Label && !Label->isDefined()) continue; // Not emitted, in dead code. 671fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola 672fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola // Advance row if new location. 673fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola if (BaseLabel && Label) { 674fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola MCSymbol *ThisSym = Label; 675fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola if (ThisSym != BaseLabel) { 676d221cd676b44d8118b1db152ecc2168538479626Bill Wendling if (streamer.isVerboseAsm()) streamer.AddComment("DW_CFA_advance_loc4"); 677fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym); 678fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola BaseLabel = ThisSym; 679fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola } 68089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 681fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola 682b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola EmitCFIInstruction(streamer, Instr); 68389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 68489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 68589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 686e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling/// EmitCompactUnwind - Emit the unwind information in a compact way. If we're 687e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling/// successful, return 'true'. Otherwise, return 'false' and it will emit the 688e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling/// normal CIE and FDE. 689e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendlingbool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer, 690e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling const MCDwarfFrameInfo &Frame) { 691e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling MCContext &Context = Streamer.getContext(); 692e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng const MCObjectFileInfo *MOFI = Context.getObjectFileInfo(); 6933c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling bool VerboseAsm = Streamer.isVerboseAsm(); 694e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling 695e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // range-start range-length compact-unwind-enc personality-func lsda 696e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // _foo LfooEnd-_foo 0x00000023 0 0 697e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // _bar LbarEnd-_bar 0x00000025 __gxx_personality except_tab1 698e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // 699e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .section __LD,__compact_unwind,regular,debug 700e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // 701e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // # compact unwind for _foo 702e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .quad _foo 703e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .set L1,LfooEnd-_foo 704e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .long L1 705e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .long 0x01010001 706e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .quad 0 707e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .quad 0 708e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // 709e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // # compact unwind for _bar 710e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .quad _bar 711e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .set L2,LbarEnd-_bar 712e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .long L2 713e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .long 0x01020011 714e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .quad __gxx_personality 715e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // .quad except_tab1 716e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling 717e52e3f2c020354c8e0e966b719152b08349d0334Bill Wendling uint32_t Encoding = Frame.CompactUnwindEncoding; 7186a6b8c3e96b9e1ca7092eafd0cfb219cbbfbdfc4Bill Wendling if (!Encoding) return false; 7196a6b8c3e96b9e1ca7092eafd0cfb219cbbfbdfc4Bill Wendling 7204bb5b037126ea35f35d5a490b03ccffa8677fa5eBill Wendling // The encoding needs to know we have an LSDA. 7214bb5b037126ea35f35d5a490b03ccffa8677fa5eBill Wendling if (Frame.Lsda) 7224bb5b037126ea35f35d5a490b03ccffa8677fa5eBill Wendling Encoding |= 0x40000000; 7234bb5b037126ea35f35d5a490b03ccffa8677fa5eBill Wendling 724e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng Streamer.SwitchSection(MOFI->getCompactUnwindSection()); 7253c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling 726e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // Range Start 727203576aa0cb9d8bf2d2e4d910ebab4b7a63262aeEvan Cheng unsigned FDEEncoding = MOFI->getFDEEncoding(UsingCFI); 7289056e9032001a2d47057cecec5e39895cbc31799Bill Wendling unsigned Size = getSizeForEncoding(Streamer, FDEEncoding); 7293c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (VerboseAsm) Streamer.AddComment("Range Start"); 7309056e9032001a2d47057cecec5e39895cbc31799Bill Wendling Streamer.EmitSymbolValue(Frame.Function, Size); 731e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling 732e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling // Range Length 733e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling const MCExpr *Range = MakeStartMinusEndExpr(Streamer, *Frame.Begin, 734e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling *Frame.End, 0); 7353c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (VerboseAsm) Streamer.AddComment("Range Length"); 7369287a6eef336585628a55e1f33e1e3ea9d7f81cfBill Wendling Streamer.EmitAbsValue(Range, 4); 7379287a6eef336585628a55e1f33e1e3ea9d7f81cfBill Wendling 7389287a6eef336585628a55e1f33e1e3ea9d7f81cfBill Wendling // Compact Encoding 7399287a6eef336585628a55e1f33e1e3ea9d7f81cfBill Wendling Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_udata4); 7406a6b8c3e96b9e1ca7092eafd0cfb219cbbfbdfc4Bill Wendling if (VerboseAsm) Streamer.AddComment(Twine("Compact Unwind Encoding: 0x") + 7416a6b8c3e96b9e1ca7092eafd0cfb219cbbfbdfc4Bill Wendling Twine(llvm::utohexstr(Encoding))); 7429287a6eef336585628a55e1f33e1e3ea9d7f81cfBill Wendling Streamer.EmitIntValue(Encoding, Size); 7439287a6eef336585628a55e1f33e1e3ea9d7f81cfBill Wendling 744e52e3f2c020354c8e0e966b719152b08349d0334Bill Wendling 7459056e9032001a2d47057cecec5e39895cbc31799Bill Wendling // Personality Function 7464bb5b037126ea35f35d5a490b03ccffa8677fa5eBill Wendling Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_absptr); 7473c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (VerboseAsm) Streamer.AddComment("Personality Function"); 7484498d39680abe3970dc84dca973aff46d0f9039bBill Wendling if (Frame.Personality) 7499056e9032001a2d47057cecec5e39895cbc31799Bill Wendling Streamer.EmitSymbolValue(Frame.Personality, Size); 7504498d39680abe3970dc84dca973aff46d0f9039bBill Wendling else 7514498d39680abe3970dc84dca973aff46d0f9039bBill Wendling Streamer.EmitIntValue(0, Size); // No personality fn 7529056e9032001a2d47057cecec5e39895cbc31799Bill Wendling 7539056e9032001a2d47057cecec5e39895cbc31799Bill Wendling // LSDA 7544498d39680abe3970dc84dca973aff46d0f9039bBill Wendling Size = getSizeForEncoding(Streamer, Frame.LsdaEncoding); 7553c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (VerboseAsm) Streamer.AddComment("LSDA"); 7564498d39680abe3970dc84dca973aff46d0f9039bBill Wendling if (Frame.Lsda) 7579056e9032001a2d47057cecec5e39895cbc31799Bill Wendling Streamer.EmitSymbolValue(Frame.Lsda, Size); 7584498d39680abe3970dc84dca973aff46d0f9039bBill Wendling else 7594498d39680abe3970dc84dca973aff46d0f9039bBill Wendling Streamer.EmitIntValue(0, Size); // No LSDA 7609056e9032001a2d47057cecec5e39895cbc31799Bill Wendling 761e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling return true; 762e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling} 763e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling 76425f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindolaconst MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, 76525f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCSymbol *personality, 76625f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola unsigned personalityEncoding, 76725f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCSymbol *lsda, 76825f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola unsigned lsdaEncoding) { 76989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = streamer.getContext(); 7700e6a052331f674dd70e28af41f654a7874405eabEvan Cheng const MCRegisterInfo &MRI = context.getRegisterInfo(); 771e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng const MCObjectFileInfo *MOFI = context.getObjectFileInfo(); 7723c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling bool verboseAsm = streamer.isVerboseAsm(); 773514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola 774514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola MCSymbol *sectionStart; 775e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng if (MOFI->isFunctionEHFrameSymbolPrivate() || !IsEH) 776514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola sectionStart = context.CreateTempSymbol(); 777514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola else 778514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum)); 779514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola 7803c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling streamer.EmitLabel(sectionStart); 781514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola CIENum++; 782514cecc72b23bb75108844285ab8f3616a08bac5Rafael Espindola 7836a6b8c3e96b9e1ca7092eafd0cfb219cbbfbdfc4Bill Wendling MCSymbol *sectionEnd = context.CreateTempSymbol(); 78489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 78589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Length 78689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart, 78789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola *sectionEnd, 4); 7883c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("CIE Length"); 7899266cc400ee2fc86abb24ab0819d9da280fb61c4Rafael Espindola streamer.EmitAbsValue(Length, 4); 79089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 79189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // CIE ID 79240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola unsigned CIE_ID = IsEH ? 0 : -1; 7933c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("CIE ID Tag"); 79440a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola streamer.EmitIntValue(CIE_ID, 4); 79589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 79689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Version 7973c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("DW_CIE_VERSION"); 79889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1); 79989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 80089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Augmentation String 80189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola SmallString<8> Augmentation; 80240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (IsEH) { 8033c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("CIE Augmentation"); 80440a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola Augmentation += "z"; 80540a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (personality) 80640a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola Augmentation += "P"; 80740a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (lsda) 80840a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola Augmentation += "L"; 80940a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola Augmentation += "R"; 81040a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola streamer.EmitBytes(Augmentation.str(), 0); 81140a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola } 81289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(0, 1); 81389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 81489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Code Alignment Factor 8153c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("CIE Code Alignment Factor"); 81689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(1); 81789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 81889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Data Alignment Factor 8193c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("CIE Data Alignment Factor"); 82089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer)); 82189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 82289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Return Address Register 8233c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("CIE Return Address Column"); 8240e6a052331f674dd70e28af41f654a7874405eabEvan Cheng streamer.EmitULEB128IntValue(MRI.getDwarfRegNum(MRI.getRARegister(), true)); 82589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 82689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Augmentation Data Length (optional) 8271f6c87554a0d78103b95816fd2c1ce392b366bcfRafael Espindola 8281f6c87554a0d78103b95816fd2c1ce392b366bcfRafael Espindola unsigned augmentationLength = 0; 82940a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (IsEH) { 83040a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (personality) { 83140a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Personality Encoding 83240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola augmentationLength += 1; 83340a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Personality 83440a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola augmentationLength += getSizeForEncoding(streamer, personalityEncoding); 83540a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola } 83640a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (lsda) 83740a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola augmentationLength += 1; 83840a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Encoding of the FDE pointers 8391f6c87554a0d78103b95816fd2c1ce392b366bcfRafael Espindola augmentationLength += 1; 8401f6c87554a0d78103b95816fd2c1ce392b366bcfRafael Espindola 8413c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("Augmentation Size"); 84240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola streamer.EmitULEB128IntValue(augmentationLength); 84389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 84440a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Augmentation Data (optional) 84540a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (personality) { 84640a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Personality Encoding 8473c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling EmitEncodingByte(streamer, personalityEncoding, 8483c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling "Personality Encoding"); 84940a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Personality 8503c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling if (verboseAsm) streamer.AddComment("Personality"); 85140a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola EmitPersonality(streamer, *personality, personalityEncoding); 85240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola } 8533c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling 85440a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (lsda) 8553c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding"); 8563c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling 85740a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Encoding of the FDE pointers 858203576aa0cb9d8bf2d2e4d910ebab4b7a63262aeEvan Cheng EmitEncodingByte(streamer, MOFI->getFDEEncoding(UsingCFI), 8593c163cfa60f9f196cd6a5a04e07baec3947fee0bBill Wendling "FDE Encoding"); 860bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 86189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 86289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Initial Instructions 86389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 8642d28617de2b0b731c08d1af9e830f31e14ac75b4Evan Cheng const MCAsmInfo &MAI = context.getAsmInfo(); 8652d28617de2b0b731c08d1af9e830f31e14ac75b4Evan Cheng const std::vector<MachineMove> &Moves = MAI.getInitialFrameState(); 866fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola std::vector<MCCFIInstruction> Instructions; 867fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola 868fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola for (int i = 0, n = Moves.size(); i != n; ++i) { 869b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola MCSymbol *Label = Moves[i].getLabel(); 870b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola const MachineLocation &Dst = 8710e6a052331f674dd70e28af41f654a7874405eabEvan Cheng TranslateMachineLocation(MRI, Moves[i].getDestination()); 872b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola const MachineLocation &Src = 8730e6a052331f674dd70e28af41f654a7874405eabEvan Cheng TranslateMachineLocation(MRI, Moves[i].getSource()); 874b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola MCCFIInstruction Inst(Label, Dst, Src); 875fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola Instructions.push_back(Inst); 876fe024d0a624404ada11fb330e7360abc5f88742eRafael Espindola } 87789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 878b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola EmitCFIInstructions(streamer, Instructions, NULL); 87989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 88089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Padding 8811be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng streamer.EmitValueToAlignment(IsEH 8821be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng ? 4 : context.getAsmInfo().getPointerSize()); 88389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 88489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitLabel(sectionEnd); 88589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola return *sectionStart; 88689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 88789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 88825f492e77858dc5a95fcd7180e73aff47925b668Rafael EspindolaMCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer, 88925f492e77858dc5a95fcd7180e73aff47925b668Rafael Espindola const MCSymbol &cieStart, 8909f270dadd429771dded5a8572da8c74513771c15Rafael Espindola const MCDwarfFrameInfo &frame) { 891bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCContext &context = streamer.getContext(); 892bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCSymbol *fdeStart = context.CreateTempSymbol(); 893bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCSymbol *fdeEnd = context.CreateTempSymbol(); 894e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng const MCObjectFileInfo *MOFI = context.getObjectFileInfo(); 8952541c41f3e2af94585e14353a91f02facd65e415Bill Wendling bool verboseAsm = streamer.isVerboseAsm(); 89689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 897e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng if (!MOFI->isFunctionEHFrameSymbolPrivate() && IsEH) { 8982541c41f3e2af94585e14353a91f02facd65e415Bill Wendling MCSymbol *EHSym = 8992541c41f3e2af94585e14353a91f02facd65e415Bill Wendling context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh")); 9008bca4106dfc2945723251db10e340183f3e372ddRafael Espindola streamer.EmitEHSymAttributes(frame.Function, EHSym); 901a8cfb87fa2176fae2d62785a0dd606e4143cefaeRafael Espindola streamer.EmitLabel(EHSym); 902a8cfb87fa2176fae2d62785a0dd606e4143cefaeRafael Espindola } 903a8cfb87fa2176fae2d62785a0dd606e4143cefaeRafael Espindola 90489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Length 90589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0); 9062541c41f3e2af94585e14353a91f02facd65e415Bill Wendling if (verboseAsm) streamer.AddComment("FDE Length"); 9079266cc400ee2fc86abb24ab0819d9da280fb61c4Rafael Espindola streamer.EmitAbsValue(Length, 4); 90889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 90989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitLabel(fdeStart); 910e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola 91189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // CIE Pointer 912e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola const MCAsmInfo &asmInfo = context.getAsmInfo(); 9130d450dc65906a30beb56aeb1ee22b45b1cd4596cRafael Espindola if (IsEH) { 9140d450dc65906a30beb56aeb1ee22b45b1cd4596cRafael Espindola const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart, 9150d450dc65906a30beb56aeb1ee22b45b1cd4596cRafael Espindola 0); 9162541c41f3e2af94585e14353a91f02facd65e415Bill Wendling if (verboseAsm) streamer.AddComment("FDE CIE Offset"); 9170d450dc65906a30beb56aeb1ee22b45b1cd4596cRafael Espindola streamer.EmitAbsValue(offset, 4); 918e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola } else if (!asmInfo.doesDwarfRequireRelocationForSectionOffset()) { 919e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola const MCExpr *offset = MakeStartMinusEndExpr(streamer, *SectionStart, 920e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola cieStart, 0); 921e3a0e987f3d4f07512cdb64b9034369f966cb448Rafael Espindola streamer.EmitAbsValue(offset, 4); 9220d450dc65906a30beb56aeb1ee22b45b1cd4596cRafael Espindola } else { 9230d450dc65906a30beb56aeb1ee22b45b1cd4596cRafael Espindola streamer.EmitSymbolValue(&cieStart, 4); 9240d450dc65906a30beb56aeb1ee22b45b1cd4596cRafael Espindola } 9252541c41f3e2af94585e14353a91f02facd65e415Bill Wendling 926203576aa0cb9d8bf2d2e4d910ebab4b7a63262aeEvan Cheng unsigned fdeEncoding = MOFI->getFDEEncoding(UsingCFI); 927abf9af60add19a0f037bb2a05433769bfd1e7f6fRafael Espindola unsigned size = getSizeForEncoding(streamer, fdeEncoding); 92889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 92989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // PC Begin 9309989ef43faf1cd7eb01a6d45063f5040e9c8bb3eRafael Espindola unsigned PCBeginEncoding = IsEH ? fdeEncoding : 9319989ef43faf1cd7eb01a6d45063f5040e9c8bb3eRafael Espindola (unsigned)dwarf::DW_EH_PE_absptr; 93240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola unsigned PCBeginSize = getSizeForEncoding(streamer, PCBeginEncoding); 9332541c41f3e2af94585e14353a91f02facd65e415Bill Wendling EmitSymbol(streamer, *frame.Begin, PCBeginEncoding, "FDE initial location"); 93489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 93589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // PC Range 93689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin, 93789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola *frame.End, 0); 9382541c41f3e2af94585e14353a91f02facd65e415Bill Wendling if (verboseAsm) streamer.AddComment("FDE address range"); 9399266cc400ee2fc86abb24ab0819d9da280fb61c4Rafael Espindola streamer.EmitAbsValue(Range, size); 94089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 94140a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (IsEH) { 94240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Augmentation Data Length 94340a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola unsigned augmentationLength = 0; 9441f6c87554a0d78103b95816fd2c1ce392b366bcfRafael Espindola 94540a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (frame.Lsda) 94640a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding); 9471f6c87554a0d78103b95816fd2c1ce392b366bcfRafael Espindola 9482541c41f3e2af94585e14353a91f02facd65e415Bill Wendling if (verboseAsm) streamer.AddComment("Augmentation size"); 94940a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola streamer.EmitULEB128IntValue(augmentationLength); 95089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 95140a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola // Augmentation Data 95240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola if (frame.Lsda) 9532541c41f3e2af94585e14353a91f02facd65e415Bill Wendling EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding, 9542541c41f3e2af94585e14353a91f02facd65e415Bill Wendling "Language Specific Data Area"); 95540a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola } 9564892dff07e7d99eb37aee868c4f2c91e9c7eba14Rafael Espindola 95789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Call Frame Instructions 95889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 959b40a71fda188f8ca564e606ac2cb051a44ada311Rafael Espindola EmitCFIInstructions(streamer, frame.Instructions, frame.Begin); 9605bba08425374ca36fe5fbc7423ce1a09858e4097Rafael Espindola 96189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Padding 96240a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola streamer.EmitValueToAlignment(PCBeginSize); 963dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola 964dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola return fdeEnd; 96589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 96689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 96719282365147f498a60463d250dbed2f8e1b81861Benjamin Kramernamespace { 96819282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer struct CIEKey { 96919282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1); } 97019282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0); } 97119282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer 97219282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_, 97319282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer unsigned LsdaEncoding_) : Personality(Personality_), 97419282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer PersonalityEncoding(PersonalityEncoding_), 97519282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer LsdaEncoding(LsdaEncoding_) { 97619282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer } 97719282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer const MCSymbol* Personality; 97819282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer unsigned PersonalityEncoding; 97919282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer unsigned LsdaEncoding; 98019282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer }; 98119282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer} 982bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola 983bdc3167c086dd4358e24692075db5e7784140843Rafael Espindolanamespace llvm { 984bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola template <> 985bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola struct DenseMapInfo<CIEKey> { 986bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static CIEKey getEmptyKey() { 98719282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer return CIEKey::getEmptyKey(); 988bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 989bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static CIEKey getTombstoneKey() { 99019282365147f498a60463d250dbed2f8e1b81861Benjamin Kramer return CIEKey::getTombstoneKey(); 991bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 992bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static unsigned getHashValue(const CIEKey &Key) { 993bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola FoldingSetNodeID ID; 994bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola ID.AddPointer(Key.Personality); 995bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola ID.AddInteger(Key.PersonalityEncoding); 996bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola ID.AddInteger(Key.LsdaEncoding); 997bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola return ID.ComputeHash(); 998bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 999bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static bool isEqual(const CIEKey &LHS, 1000bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola const CIEKey &RHS) { 1001bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola return LHS.Personality == RHS.Personality && 1002bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola LHS.PersonalityEncoding == RHS.PersonalityEncoding && 1003bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola LHS.LsdaEncoding == RHS.LsdaEncoding; 1004bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 1005bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola }; 1006bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola} 1007bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola 1008a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendlingvoid MCDwarfFrameEmitter::Emit(MCStreamer &Streamer, 1009a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling bool UsingCFI, 1010a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling bool IsEH) { 1011a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling MCContext &Context = Streamer.getContext(); 1012e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng MCObjectFileInfo *MOFI = 1013e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng const_cast<MCObjectFileInfo*>(Context.getObjectFileInfo()); 1014e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng const MCSection &Section = IsEH ? *MOFI->getEHFrameSection() : 1015e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng *MOFI->getDwarfFrameSection(); 1016a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling Streamer.SwitchSection(&Section); 1017a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling MCSymbol *SectionStart = Context.CreateTempSymbol(); 1018a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling Streamer.EmitLabel(SectionStart); 1019a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling 1020a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling MCSymbol *FDEEnd = NULL; 1021bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola DenseMap<CIEKey, const MCSymbol*> CIEStarts; 1022a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling FrameEmitterImpl Emitter(UsingCFI, IsEH, SectionStart); 1023d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola 102440a7dbbeff44c4cbd8c7e4f07f28dd614f8a5d08Rafael Espindola const MCSymbol *DummyDebugKey = NULL; 1025a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) { 1026a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i); 1027e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng if (IsEH && MOFI->getCompactUnwindSection() && 1028e76a33b9567d78a5744dc52fcec3a6056d6fb576Evan Cheng Frame.CompactUnwindEncoding && 10298440fe21668fd4d47378371073af0702ea9413bcBill Wendling Emitter.EmitCompactUnwind(Streamer, Frame)) { 10308440fe21668fd4d47378371073af0702ea9413bcBill Wendling FDEEnd = NULL; 1031e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling continue; 10328440fe21668fd4d47378371073af0702ea9413bcBill Wendling } 1033e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling 1034a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling CIEKey Key(Frame.Personality, Frame.PersonalityEncoding, 1035a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling Frame.LsdaEncoding); 1036a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling const MCSymbol *&CIEStart = IsEH ? CIEStarts[Key] : DummyDebugKey; 1037a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling if (!CIEStart) 1038a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling CIEStart = &Emitter.EmitCIE(Streamer, Frame.Personality, 1039a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling Frame.PersonalityEncoding, Frame.Lsda, 1040a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling Frame.LsdaEncoding); 1041e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling 1042a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling FDEEnd = Emitter.EmitFDE(Streamer, *CIEStart, Frame); 1043e3cd13f0e2d4e2ef30f8a57c0a82d328102eeb26Bill Wendling 1044dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola if (i != n - 1) 1045a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling Streamer.EmitLabel(FDEEnd); 1046dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola } 1047d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola 10481be0e271a07925b928ba89848934f1ea6f1854e2Evan Cheng Streamer.EmitValueToAlignment(Context.getAsmInfo().getPointerSize()); 1049a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling if (FDEEnd) 1050a8c9e6a943bc0873d1ce781d2444a6d6137f0e17Bill Wendling Streamer.EmitLabel(FDEEnd); 105189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 1052245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola 1053245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindolavoid MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer, 1054245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola uint64_t AddrDelta) { 1055245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola SmallString<256> Tmp; 1056245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola raw_svector_ostream OS(Tmp); 10574eafe109459eb115f13f1d19c5ff3cb3678e8c7aRafael Espindola MCDwarfFrameEmitter::EncodeAdvanceLoc(AddrDelta, OS); 1058245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola Streamer.EmitBytes(OS.str(), /*AddrSpace=*/0); 1059245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola} 1060245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola 1061245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindolavoid MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta, 10624eafe109459eb115f13f1d19c5ff3cb3678e8c7aRafael Espindola raw_ostream &OS) { 1063245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola // FIXME: Assumes the code alignment factor is 1. 10643b78cdc57ae25ff021fd67171a7c82d533477a19Rafael Espindola if (AddrDelta == 0) { 10654eafe109459eb115f13f1d19c5ff3cb3678e8c7aRafael Espindola } else if (isUIntN(6, AddrDelta)) { 1066245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola uint8_t Opcode = dwarf::DW_CFA_advance_loc | AddrDelta; 1067245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << Opcode; 10684eafe109459eb115f13f1d19c5ff3cb3678e8c7aRafael Espindola } else if (isUInt<8>(AddrDelta)) { 1069245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint8_t(dwarf::DW_CFA_advance_loc1); 1070245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint8_t(AddrDelta); 10714eafe109459eb115f13f1d19c5ff3cb3678e8c7aRafael Espindola } else if (isUInt<16>(AddrDelta)) { 1072a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola // FIXME: check what is the correct behavior on a big endian machine. 1073245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint8_t(dwarf::DW_CFA_advance_loc2); 1074a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola OS << uint8_t( AddrDelta & 0xff); 1075a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola OS << uint8_t((AddrDelta >> 8) & 0xff); 1076245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola } else { 1077a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola // FIXME: check what is the correct behavior on a big endian machine. 1078245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola assert(isUInt<32>(AddrDelta)); 1079245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint8_t(dwarf::DW_CFA_advance_loc4); 1080a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola OS << uint8_t( AddrDelta & 0xff); 1081a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola OS << uint8_t((AddrDelta >> 8) & 0xff); 1082a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola OS << uint8_t((AddrDelta >> 16) & 0xff); 1083a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola OS << uint8_t((AddrDelta >> 24) & 0xff); 1084a7e450574c45209ca0b05ff715f9e7dddcbd936cRafael Espindola 1085245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola } 1086245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola} 1087