MCDwarf.cpp revision 245a1e20419aa5a3c833d7a8e89168e19d5f4d2c
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 10bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola#include "llvm/ADT/FoldingSet.h" 11767b1be3900bdc693aa0ad3e554ba034845f67f7Rafael Espindola#include "llvm/MC/MCAsmInfo.h" 127cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby#include "llvm/MC/MCDwarf.h" 13c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCAssembler.h" 14ad8aaa069cfdb3bdc32b1becc8881f67b5272e14Rafael Espindola#include "llvm/MC/MCStreamer.h" 15c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCSymbol.h" 16c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCExpr.h" 17c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCContext.h" 18c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCObjectWriter.h" 19c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/ADT/SmallString.h" 207cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby#include "llvm/Support/Debug.h" 217cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby#include "llvm/Support/raw_ostream.h" 22c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/Target/TargetAsmBackend.h" 2389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola#include "llvm/Target/TargetAsmInfo.h" 247cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderbyusing namespace llvm; 257cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby 26c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Given a special op, return the address skip amount (in units of 27c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// DWARF2_LINE_MIN_INSN_LENGTH. 28c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) 29c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 30c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// The maximum address skip amount that can be encoded with a special op. 31c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) 32c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 33c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// First special line opcode - leave room for the standard opcodes. 34c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Note: If you want to change this, you'll have to update the 35c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// "standard_opcode_lengths" table that is emitted in DwarfFileTable::Emit(). 36c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#define DWARF2_LINE_OPCODE_BASE 13 37c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 38c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Minimum line offset in a special line info. opcode. This value 39c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// was chosen to give a reasonable range of values. 40c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#define DWARF2_LINE_BASE -5 41c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 42c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Range of line offsets in a special line info. opcode. 43c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby# define DWARF2_LINE_RANGE 14 44c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 45c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Define the architecture-dependent minimum instruction length (in bytes). 46c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This value should be rather too small than too big. 47c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby# define DWARF2_LINE_MIN_INSN_LENGTH 1 48c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 49c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Note: when DWARF2_LINE_MIN_INSN_LENGTH == 1 which is the current setting, 50c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// this routine is a nop and will be optimized away. 51c095793b4ab027181605c79c9808df12afe45d63Kevin Enderbystatic inline uint64_t ScaleAddrDelta(uint64_t AddrDelta) 52c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby{ 53c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (DWARF2_LINE_MIN_INSN_LENGTH == 1) 54c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return AddrDelta; 55c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (AddrDelta % DWARF2_LINE_MIN_INSN_LENGTH != 0) { 56c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // TODO: report this error, but really only once. 57c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby ; 58c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 59c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return AddrDelta / DWARF2_LINE_MIN_INSN_LENGTH; 60c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 61c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 62c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 63c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This is called when an instruction is assembled into the specified section 64c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// and if there is information from the last .loc directive that has yet to have 65c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// a line entry made for it is made. 66c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 67195a0ce484cd12a5adae9184188f6d0fb52b84c0Rafael Espindolavoid MCLineEntry::Make(MCStreamer *MCOS, const MCSection *Section) { 68c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (!MCOS->getContext().getDwarfLocSeen()) 69c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 70c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 71c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol at in the current section for use in the line entry. 72c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCSymbol *LineSym = MCOS->getContext().CreateTempSymbol(); 73c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Set the value of the symbol to use for the MCLineEntry. 74c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(LineSym); 75c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 76c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Get the current .loc info saved in the context. 77c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCDwarfLoc &DwarfLoc = MCOS->getContext().getCurrentDwarfLoc(); 78c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 79c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a (local) line entry with the symbol and the current .loc info. 80c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCLineEntry LineEntry(LineSym, DwarfLoc); 81c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 82c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // clear DwarfLocSeen saying the current .loc info is now used. 833f55c24df9527de345f6cc960944840a7a101c6aKevin Enderby MCOS->getContext().ClearDwarfLocSeen(); 84c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 85c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Get the MCLineSection for this section, if one does not exist for this 86c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // section create it. 8717fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const DenseMap<const MCSection *, MCLineSection *> &MCLineSections = 88c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->getContext().getMCLineSections(); 8917fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola MCLineSection *LineSection = MCLineSections.lookup(Section); 90c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (!LineSection) { 91c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a new MCLineSection. This will be deleted after the dwarf line 92c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // table is created using it by iterating through the MCLineSections 93c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // DenseMap. 94c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LineSection = new MCLineSection; 95c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Save a pointer to the new LineSection into the MCLineSections DenseMap. 9617fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola MCOS->getContext().addMCLineSection(Section, LineSection); 97c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 98c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 99c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Add the line entry to this section's entries. 100c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LineSection->addLineEntry(LineEntry); 101c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 102c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 103c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 104c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This helper routine returns an expression of End - Start + IntVal . 105c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 1065fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindolastatic inline const MCExpr *MakeStartMinusEndExpr(const MCStreamer &MCOS, 1075fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola const MCSymbol &Start, 1085fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola const MCSymbol &End, 1095fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola int IntVal) { 110c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 111c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *Res = 1125fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCSymbolRefExpr::Create(&End, Variant, MCOS.getContext()); 113c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *RHS = 1145fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCSymbolRefExpr::Create(&Start, Variant, MCOS.getContext()); 115c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *Res1 = 1165fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCBinaryExpr::Create(MCBinaryExpr::Sub, Res, RHS, MCOS.getContext()); 117c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *Res2 = 1185fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCConstantExpr::Create(IntVal, MCOS.getContext()); 119c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCExpr *Res3 = 1205fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCBinaryExpr::Create(MCBinaryExpr::Sub, Res1, Res2, MCOS.getContext()); 121c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return Res3; 122c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 123c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 124c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 125c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This emits the Dwarf line table for the specified section from the entries 126c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// in the LineSection. 127c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 128195a0ce484cd12a5adae9184188f6d0fb52b84c0Rafael Espindolastatic inline void EmitDwarfLineTable(MCStreamer *MCOS, 129c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const MCSection *Section, 13089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCLineSection *LineSection) { 131c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned FileNum = 1; 132c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned LastLine = 1; 133c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned Column = 0; 134c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; 135c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby unsigned Isa = 0; 136c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCSymbol *LastLabel = NULL; 137c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 138c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Loop through each MCLineEntry and encode the dwarf line number table. 13917fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola for (MCLineSection::const_iterator 140c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby it = LineSection->getMCLineEntries()->begin(), 141c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby ie = LineSection->getMCLineEntries()->end(); it != ie; ++it) { 142c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 143c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (FileNum != it->getFileNum()) { 144c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby FileNum = it->getFileNum(); 145c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_file, 1); 1463ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola MCOS->EmitULEB128IntValue(FileNum); 147c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 148c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Column != it->getColumn()) { 149c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Column = it->getColumn(); 150c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_column, 1); 1513ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola MCOS->EmitULEB128IntValue(Column); 152c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 153c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Isa != it->getIsa()) { 154c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Isa = it->getIsa(); 155c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_isa, 1); 1563ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola MCOS->EmitULEB128IntValue(Isa); 157c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 158c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if ((it->getFlags() ^ Flags) & DWARF2_FLAG_IS_STMT) { 159c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Flags = it->getFlags(); 160c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_negate_stmt, 1); 161c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 162c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (it->getFlags() & DWARF2_FLAG_BASIC_BLOCK) 163c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_basic_block, 1); 164c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (it->getFlags() & DWARF2_FLAG_PROLOGUE_END) 165c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_prologue_end, 1); 166c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (it->getFlags() & DWARF2_FLAG_EPILOGUE_BEGIN) 167c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(dwarf::DW_LNS_set_epilogue_begin, 1); 168c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 16964185cc6090f695c4f97c51cf2adc731f56d1a20Rafael Espindola int64_t LineDelta = static_cast<int64_t>(it->getLine()) - LastLine; 170c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCSymbol *Label = it->getLabel(); 171c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 172c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // At this point we want to emit/create the sequence to encode the delta in 173c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // line numbers and the increment of the address from the previous Label 174c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // and the current Label. 17532a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola MCOS->EmitDwarfAdvanceLineAddr(LineDelta, LastLabel, Label); 176c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 177c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LastLine = it->getLine(); 178c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LastLabel = Label; 179c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 180c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 181c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Emit a DW_LNE_end_sequence for the end of the section. 182c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Using the pointer Section create a temporary label at the end of the 183c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // section and use that and the LastLabel to compute the address delta 184c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // and use INT64_MAX as the line delta which is the signal that this is 185c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // actually a DW_LNE_end_sequence. 186c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 187c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Switch to the section to be able to create a symbol at its end. 188c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->SwitchSection(Section); 18989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 19089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = MCOS->getContext(); 191c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol at the end of the section. 19289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *SectionEnd = context.CreateTempSymbol(); 193c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Set the value of the symbol, as we are at the end of the section. 194c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(SectionEnd); 195c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 196c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Switch back the the dwarf line section. 19789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection()); 198195a0ce484cd12a5adae9184188f6d0fb52b84c0Rafael Espindola 19932a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd); 200c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 201c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 202c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 203c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// This emits the Dwarf file and the line tables. 204c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// 20589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindolavoid MCDwarfFileTable::Emit(MCStreamer *MCOS) { 20689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = MCOS->getContext(); 207c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Switch to the section where the table will be emitted into. 20889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection()); 209c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 210c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol at the beginning of this section. 21189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *LineStartSym = context.CreateTempSymbol(); 212c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Set the value of the symbol, as we are at the start of the section. 213c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(LineStartSym); 214c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 215c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol for the end of the section (to be set when we get there). 21689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *LineEndSym = context.CreateTempSymbol(); 217c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 218c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // The first 4 bytes is the total length of the information for this 219c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // compilation unit (not including these 4 bytes for the length). 2205fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCOS->EmitAbsValue(MakeStartMinusEndExpr(*MCOS, *LineStartSym, *LineEndSym,4), 2210bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola 4); 222c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 223c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Next 2 bytes is the Version, which is Dwarf 2. 224c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(2, 2); 225c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 226c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Create a symbol for the end of the prologue (to be set when we get there). 22789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *ProEndSym = context.CreateTempSymbol(); // Lprologue_end 228c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 229c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Length of the prologue, is the next 4 bytes. Which is the start of the 230c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // section to the end of the prologue. Not including the 4 bytes for the 231c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // total length, the 2 bytes for the version, and these 4 bytes for the 232c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // length of the prologue. 2335fad7a99c00980fc30ce16fb51ce09dc435c40adRafael Espindola MCOS->EmitAbsValue(MakeStartMinusEndExpr(*MCOS, *LineStartSym, *ProEndSym, 234c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby (4 + 2 + 4)), 2355d4918dbd116b0b5e561c431b1ea527ee1b9302aRafael Espindola 4, 0); 236c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 237c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Parameters of the state machine, are next. 238c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_MIN_INSN_LENGTH, 1); 239c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_DEFAULT_IS_STMT, 1); 240c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_BASE, 1); 241c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_RANGE, 1); 242c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(DWARF2_LINE_OPCODE_BASE, 1); 243c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 244c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Standard opcode lengths 245c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_copy 246c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_advance_pc 247c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_advance_line 248c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_set_file 249c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_set_column 250c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_negate_stmt 251c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_basic_block 252c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_const_add_pc 253c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // length of DW_LNS_fixed_advance_pc 254c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_prologue_end 255c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_epilogue_begin 256c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(1, 1); // DW_LNS_set_isa 257c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 258c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Put out the directory and file tables. 259c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 260c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // First the directory table. 261c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const std::vector<StringRef> &MCDwarfDirs = 26289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola context.getMCDwarfDirs(); 263c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby for (unsigned i = 0; i < MCDwarfDirs.size(); i++) { 264c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(MCDwarfDirs[i], 0); // the DirectoryName 265c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(StringRef("\0", 1), 0); // the null term. of the string 266c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 267c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // Terminate the directory list 268c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 269c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Second the file table. 270c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby const std::vector<MCDwarfFile *> &MCDwarfFiles = 271c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->getContext().getMCDwarfFiles(); 272c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby for (unsigned i = 1; i < MCDwarfFiles.size(); i++) { 273c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(MCDwarfFiles[i]->getName(), 0); // FileName 274c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(StringRef("\0", 1), 0); // the null term. of the string 2753ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola // the Directory num 2763ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola MCOS->EmitULEB128IntValue(MCDwarfFiles[i]->getDirIndex()); 277c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // last modification timestamp (always 0) 278c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // filesize (always 0) 279c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 280c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitIntValue(0, 1); // Terminate the file list 281c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 282c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // This is the end of the prologue, so set the value of the symbol at the 283c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // end of the prologue (that was used in a previous expression). 284c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(ProEndSym); 285c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 286c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Put out the line tables. 28717fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const DenseMap<const MCSection *, MCLineSection *> &MCLineSections = 288c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->getContext().getMCLineSections(); 28917fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const std::vector<const MCSection *> &MCLineSectionOrder = 29017fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola MCOS->getContext().getMCLineSectionOrder(); 29117fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola for (std::vector<const MCSection*>::const_iterator it = 29217fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie; 29317fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola ++it) { 29417fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const MCSection *Sec = *it; 29517fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola const MCLineSection *Line = MCLineSections.lookup(Sec); 29689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola EmitDwarfLineTable(MCOS, Sec, Line); 297c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 298c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Now delete the MCLineSections that were created in MCLineEntry::Make() 299c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // and used to emit the line table. 30017fd7bda5ac08f873c063c64e1456f8960a0c765Rafael Espindola delete Line; 301c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 302c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 303767b1be3900bdc693aa0ad3e554ba034845f67f7Rafael Espindola if (MCOS->getContext().getAsmInfo().getLinkerRequiresNonEmptyDwarfLines() 304767b1be3900bdc693aa0ad3e554ba034845f67f7Rafael Espindola && MCLineSectionOrder.begin() == MCLineSectionOrder.end()) { 305a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // The darwin9 linker has a bug (see PR8715). For for 32-bit architectures 306a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // it requires: 307a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // total_length >= prologue_length + 10 308a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // We are 4 bytes short, since we have total_length = 51 and 309a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // prologue_length = 45 310a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola 311a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola // The regular end_sequence should be sufficient. 312a8de83c68aaa03cafa0e3618fb8bf030b48f6540Rafael Espindola MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0); 3135113cdbfff7df4c7a79a92e5aa971126254202c6Devang Patel } 3145113cdbfff7df4c7a79a92e5aa971126254202c6Devang Patel 315c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // This is the end of the section, so set the value of the symbol at the end 316c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // of this section (that was used in a previous expression). 317c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitLabel(LineEndSym); 318c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 319c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 320c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby/// Utility function to write the encoding to an object writer. 321c095793b4ab027181605c79c9808df12afe45d63Kevin Enderbyvoid MCDwarfLineAddr::Write(MCObjectWriter *OW, int64_t LineDelta, 322c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby uint64_t AddrDelta) { 323c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<256> Tmp; 324c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OS(Tmp); 325c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS); 326c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OW->WriteBytes(OS.str()); 327c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 328c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 329c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby/// Utility function to emit the encoding to a streamer. 330195a0ce484cd12a5adae9184188f6d0fb52b84c0Rafael Espindolavoid MCDwarfLineAddr::Emit(MCStreamer *MCOS, int64_t LineDelta, 331c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby uint64_t AddrDelta) { 332c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<256> Tmp; 333c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OS(Tmp); 334c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS); 335c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCOS->EmitBytes(OS.str(), /*AddrSpace=*/0); 336c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 337c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 338c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby/// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas. 339c095793b4ab027181605c79c9808df12afe45d63Kevin Enderbyvoid MCDwarfLineAddr::Encode(int64_t LineDelta, uint64_t AddrDelta, 340c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_ostream &OS) { 341c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby uint64_t Temp, Opcode; 342c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby bool NeedCopy = false; 343c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 344c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Scale the address delta by the minimum instruction length. 345c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby AddrDelta = ScaleAddrDelta(AddrDelta); 346c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 347c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // A LineDelta of INT64_MAX is a signal that this is actually a 348c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // DW_LNE_end_sequence. We cannot use special opcodes here, since we want the 349c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // end_sequence to emit the matrix entry. 350c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (LineDelta == INT64_MAX) { 351c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (AddrDelta == MAX_SPECIAL_ADDR_DELTA) 352c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_const_add_pc); 353c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby else { 354c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_advance_pc); 355c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<32> Tmp; 356c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OSE(Tmp); 357c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCObjectWriter::EncodeULEB128(AddrDelta, OSE); 358c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << OSE.str(); 359c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 360c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_extended_op); 361c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(1); 362c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNE_end_sequence); 363c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 364c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 365c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 366c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Bias the line delta by the base. 367c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Temp = LineDelta - DWARF2_LINE_BASE; 368c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 369c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // If the line increment is out of range of a special opcode, we must encode 370c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // it with DW_LNS_advance_line. 371c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Temp >= DWARF2_LINE_RANGE) { 372c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_advance_line); 373c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<32> Tmp; 374c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OSE(Tmp); 375c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCObjectWriter::EncodeSLEB128(LineDelta, OSE); 376c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << OSE.str(); 377c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 378c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby LineDelta = 0; 379c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Temp = 0 - DWARF2_LINE_BASE; 380c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby NeedCopy = true; 381c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 382c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 383c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Use DW_LNS_copy instead of a "line +0, addr +0" special opcode. 384c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (LineDelta == 0 && AddrDelta == 0) { 385c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_copy); 386c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 387c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 388c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 389c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Bias the opcode by the special opcode base. 390c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Temp += DWARF2_LINE_OPCODE_BASE; 391c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 392c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Avoid overflow when addr_delta is large. 393c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (AddrDelta < 256 + MAX_SPECIAL_ADDR_DELTA) { 394c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Try using a special opcode. 395c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Opcode = Temp + AddrDelta * DWARF2_LINE_RANGE; 396c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Opcode <= 255) { 397c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(Opcode); 398c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 399c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 400c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 401c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Try using DW_LNS_const_add_pc followed by special op. 402c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby Opcode = Temp + (AddrDelta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; 403c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (Opcode <= 255) { 404c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_const_add_pc); 405c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(Opcode); 406c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby return; 407c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 408c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby } 409c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 410c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby // Otherwise use DW_LNS_advance_pc. 411c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_advance_pc); 412c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<32> Tmp; 413c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OSE(Tmp); 414c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCObjectWriter::EncodeULEB128(AddrDelta, OSE); 415c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << OSE.str(); 416c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 417c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby if (NeedCopy) 418c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(dwarf::DW_LNS_copy); 419c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby else 420c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby OS << char(Temp); 421c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 422c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 4237cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderbyvoid MCDwarfFile::print(raw_ostream &OS) const { 4247cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby OS << '"' << getName() << '"'; 4257cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby} 4267cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby 4277cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderbyvoid MCDwarfFile::dump() const { 4287cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby print(dbgs()); 4297cbf73a73f296167b6e978dbd919ed249e88eeb5Kevin Enderby} 430c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 43189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindolastatic int getDataAlignmentFactor(MCStreamer &streamer) { 43289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = streamer.getContext(); 43389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); 43489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola int size = asmInfo.getPointerSize(); 43589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (asmInfo.getStackGrowthDirection() == TargetFrameInfo::StackGrowsUp) 43689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola return size; 43789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola else 43889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola return -size; 43989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 44089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 44189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola/// EmitFrameMoves - Emit frame instructions to describe the layout of the 44289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola/// frame. 44389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindolastatic void EmitFrameMoves(MCStreamer &streamer, 44489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const std::vector<MachineMove> &Moves, 44589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *BaseLabel, bool isEH) { 44689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = streamer.getContext(); 44789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); 44889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola int dataAlignmentFactor = getDataAlignmentFactor(streamer); 44989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 45089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola for (unsigned i = 0, N = Moves.size(); i < N; ++i) { 45189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MachineMove &Move = Moves[i]; 45289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *Label = Move.getLabel(); 45389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Throw out move if the label is invalid. 45489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Label && !Label->isDefined()) continue; // Not emitted, in dead code. 45589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 45689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MachineLocation &Dst = Move.getDestination(); 45789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MachineLocation &Src = Move.getSource(); 45889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 45989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Advance row if new location. 46089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (BaseLabel && Label) { 46189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *ThisSym = Label; 46289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (ThisSym != BaseLabel) { 463245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym); 46489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola BaseLabel = ThisSym; 46589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 46689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 46789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 46889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // If advancing cfa. 46989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) { 47089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola assert(!Src.isReg() && "Machine move not supported yet."); 47189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 47289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Src.getReg() == MachineLocation::VirtualFP) { 47389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1); 47489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } else { 47589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1); 476d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Src.getReg(), 477d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola isEH)); 47889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 47989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 48089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(-Src.getOffset(), 1); 48189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola continue; 48289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 48389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 48489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) { 48589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola assert(Dst.isReg() && "Machine move not supported yet."); 48689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1); 48789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Dst.getReg(), isEH)); 48889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola continue; 48989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 49089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 49189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola unsigned Reg = asmInfo.getDwarfRegNum(Src.getReg(), isEH); 49289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola int Offset = Dst.getOffset() / dataAlignmentFactor; 49389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 49489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola if (Offset < 0) { 49589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1); 49689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(Reg); 49789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitSLEB128IntValue(Offset); 49889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } else if (Reg < 64) { 49989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1); 50089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(Offset, 1); 50189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } else { 50289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1); 50389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(Reg, 1); 50489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(Offset, 1); 50589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 50689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola } 50789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 50889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 509bdc3167c086dd4358e24692075db5e7784140843Rafael Espindolastatic void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol, 510bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned symbolEncoding) { 511bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCContext &context = streamer.getContext(); 512bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); 513bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned format = symbolEncoding & 0x0f; 514bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned application = symbolEncoding & 0xf0; 515bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned size; 516bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola switch (format) { 517bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola default: 518bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola assert(0 && "Unknown Encoding"); 519bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola break; 520bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_absptr: 521bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_signed: 522bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola size = asmInfo.getPointerSize(); 523bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola break; 524bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_udata2: 525bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_sdata2: 526bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola size = 2; 527bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola break; 528bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_udata4: 529bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_sdata4: 530bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola size = 4; 531bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola break; 532bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_udata8: 533bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_sdata8: 534bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola size = 8; 535bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola break; 536bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 537bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola switch (application) { 538bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola default: 539bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola assert(0 && "Unknown Encoding"); 540bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola break; 541bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case 0: 542bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_indirect: 543bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola streamer.EmitSymbolValue(&symbol, size); 544bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola break; 545bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola case dwarf::DW_EH_PE_pcrel: 546bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola streamer.EmitPCRelSymbolValue(&symbol, size); 547bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola break; 548bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 549bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola} 550bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola 551d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindolastatic const MCSymbol &EmitCIE(MCStreamer &streamer, 5523a83c40ab61d5ca624f2bbadd70237c6adbdb304Rafael Espindola const MCSymbol *personality, 553bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned personalityEncoding, 554bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola const MCSymbol *lsda, 555bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned lsdaEncoding) { 55689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCContext &context = streamer.getContext(); 55789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); 55889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCSection §ion = *asmInfo.getEHFrameSection(); 55989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.SwitchSection(§ion); 56089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *sectionStart = streamer.getContext().CreateTempSymbol(); 56189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol(); 56289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 56389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Length 56489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart, 56589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola *sectionEnd, 4); 56689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitLabel(sectionStart); 56789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitValue(Length, 4); 56889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 56989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // CIE ID 57089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(0, 4); 57189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 57289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Version 57389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1); 57489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 57589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Augmentation String 57689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola SmallString<8> Augmentation; 577d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola Augmentation += "z"; 578d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola if (personality) 579d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola Augmentation += "P"; 580bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola if (lsda) 581bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola Augmentation += "L"; 582d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola Augmentation += "R"; 58389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitBytes(Augmentation.str(), 0); 58489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(0, 1); 58589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 58689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Code Alignment Factor 58789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(1); 58889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 58989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Data Alignment Factor 59089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer)); 59189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 59289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Return Address Register 59389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true)); 59489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 59589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Augmentation Data Length (optional) 59689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol(); 59789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol(); 59889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer, 59989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola *augmentationStart, 60089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola *augmentationEnd, 0); 60189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitULEB128Value(augmentationLength); 60289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 60389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Augmentation Data (optional) 60489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitLabel(augmentationStart); 605d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola if (personality) { 606d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola // Personality Encoding 6073a83c40ab61d5ca624f2bbadd70237c6adbdb304Rafael Espindola streamer.EmitIntValue(personalityEncoding, 1); 608d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola // Personality 609bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola EmitSymbol(streamer, *personality, personalityEncoding); 610bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 611bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola if (lsda) { 612bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola // LSDA Encoding 613bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola streamer.EmitIntValue(lsdaEncoding, 1); 614d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola } 615d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola // Encoding of the FDE pointers 61689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitIntValue(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4, 1); 61789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitLabel(augmentationEnd); 61889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 61989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Initial Instructions 62089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 62189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const std::vector<MachineMove> Moves = asmInfo.getInitialFrameState(); 62289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 62389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola EmitFrameMoves(streamer, Moves, NULL, true); 62489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 62589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Padding 626d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola streamer.EmitValueToAlignment(4); 62789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 62889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitLabel(sectionEnd); 62989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola return *sectionStart; 63089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 63189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 632dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindolastatic MCSymbol *EmitFDE(MCStreamer &streamer, 633dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola const MCSymbol &cieStart, 634dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola const MCDwarfFrameInfo &frame) { 635bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCContext &context = streamer.getContext(); 636bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCSymbol *fdeStart = context.CreateTempSymbol(); 637bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCSymbol *fdeEnd = context.CreateTempSymbol(); 63889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 63989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Length 64089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0); 64189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitValue(Length, 4); 64289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 64389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitLabel(fdeStart); 64489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // CIE Pointer 64589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart, 64689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 0); 64789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitValue(offset, 4); 64889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 64989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // PC Begin 65089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitPCRelSymbolValue(frame.Begin, 4); 65189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 65289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // PC Range 65389b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin, 65489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola *frame.End, 0); 65589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola streamer.EmitValue(Range, 4); 65689b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 65789b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Augmentation Data Length 658bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol(); 659bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol(); 660bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer, 661bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola *augmentationStart, 662bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola *augmentationEnd, 0); 663bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola streamer.EmitULEB128Value(augmentationLength); 66489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 66589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Augmentation Data 666bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola streamer.EmitLabel(augmentationStart); 667bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola if (frame.Lsda) 668bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding); 669bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola streamer.EmitLabel(augmentationEnd); 67089b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Call Frame Instructions 67189b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 6725bba08425374ca36fe5fbc7423ce1a09858e4097Rafael Espindola EmitFrameMoves(streamer, frame.Moves, frame.Begin, true); 6735bba08425374ca36fe5fbc7423ce1a09858e4097Rafael Espindola 67489b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola // Padding 675dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola streamer.EmitValueToAlignment(4); 676dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola 677dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola return fdeEnd; 67889b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 67989b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola 680bdc3167c086dd4358e24692075db5e7784140843Rafael Espindolastruct CIEKey { 681bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static const CIEKey EmptyKey; 682bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static const CIEKey TombstoneKey; 683bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola 684bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_, 685bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned LsdaEncoding_) : Personality(Personality_), 686bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola PersonalityEncoding(PersonalityEncoding_), 687bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola LsdaEncoding(LsdaEncoding_) { 688bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 689bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola const MCSymbol* Personality; 690bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned PersonalityEncoding; 691bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola unsigned LsdaEncoding; 692bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola}; 693bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola 694bdc3167c086dd4358e24692075db5e7784140843Rafael Espindolaconst CIEKey CIEKey::EmptyKey(0, 0, -1); 695bdc3167c086dd4358e24692075db5e7784140843Rafael Espindolaconst CIEKey CIEKey::TombstoneKey(0, -1, 0); 696bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola 697bdc3167c086dd4358e24692075db5e7784140843Rafael Espindolanamespace llvm { 698bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola template <> 699bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola struct DenseMapInfo<CIEKey> { 700bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static CIEKey getEmptyKey() { 701bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola return CIEKey::EmptyKey; 702bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 703bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static CIEKey getTombstoneKey() { 704bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola return CIEKey::TombstoneKey; 705bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 706bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static unsigned getHashValue(const CIEKey &Key) { 707bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola FoldingSetNodeID ID; 708bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola ID.AddPointer(Key.Personality); 709bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola ID.AddInteger(Key.PersonalityEncoding); 710bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola ID.AddInteger(Key.LsdaEncoding); 711bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola return ID.ComputeHash(); 712bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 713bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola static bool isEqual(const CIEKey &LHS, 714bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola const CIEKey &RHS) { 715bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola return LHS.Personality == RHS.Personality && 716bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola LHS.PersonalityEncoding == RHS.PersonalityEncoding && 717bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola LHS.LsdaEncoding == RHS.LsdaEncoding; 718bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola } 719bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola }; 720bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola} 721bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola 72289b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindolavoid MCDwarfFrameEmitter::Emit(MCStreamer &streamer) { 723dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola const MCContext &context = streamer.getContext(); 724dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); 725dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola MCSymbol *fdeEnd = NULL; 726bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola DenseMap<CIEKey, const MCSymbol*> CIEStarts; 727d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola 728dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i) { 729d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola const MCDwarfFrameInfo &frame = streamer.getFrameInfo(i); 730bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola CIEKey key(frame.Personality, frame.PersonalityEncoding, 731bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola frame.LsdaEncoding); 732bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola const MCSymbol *&cieStart = CIEStarts[key]; 733d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola if (!cieStart) 7343a83c40ab61d5ca624f2bbadd70237c6adbdb304Rafael Espindola cieStart = &EmitCIE(streamer, frame.Personality, 735bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola frame.PersonalityEncoding, frame.Lsda, 736bdc3167c086dd4358e24692075db5e7784140843Rafael Espindola frame.LsdaEncoding); 737d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola fdeEnd = EmitFDE(streamer, *cieStart, frame); 738dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola if (i != n - 1) 739dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola streamer.EmitLabel(fdeEnd); 740dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola } 741d7c8ccae8e48dce3ab7c3e9b4d8a309998c47961Rafael Espindola 742dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola streamer.EmitValueToAlignment(asmInfo.getPointerSize()); 743dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola if (fdeEnd) 744dfe125cc9cfd524575973daa297c9aad10470390Rafael Espindola streamer.EmitLabel(fdeEnd); 74589b9372605db2ce3b0085c84089e389f7bc1fbddRafael Espindola} 746245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola 747245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindolavoid MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer, 748245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola uint64_t AddrDelta) { 749245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola SmallString<256> Tmp; 750245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola raw_svector_ostream OS(Tmp); 751245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola MCDwarfFrameEmitter::EncodeAdvanceLoc(AddrDelta, OS); 752245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola Streamer.EmitBytes(OS.str(), /*AddrSpace=*/0); 753245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola} 754245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola 755245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindolavoid MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta, 756245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola raw_ostream &OS) { 757245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola // FIXME: Assumes the code alignment factor is 1. 758245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola if (isUIntN(6, AddrDelta)) { 759245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola uint8_t Opcode = dwarf::DW_CFA_advance_loc | AddrDelta; 760245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << Opcode; 761245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola } else if (isUInt<8>(AddrDelta)) { 762245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint8_t(dwarf::DW_CFA_advance_loc1); 763245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint8_t(AddrDelta); 764245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola } else if (isUInt<16>(AddrDelta)) { 765245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint8_t(dwarf::DW_CFA_advance_loc2); 766245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint16_t(AddrDelta); 767245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola } else { 768245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola assert(isUInt<32>(AddrDelta)); 769245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint8_t(dwarf::DW_CFA_advance_loc4); 770245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola OS << uint32_t(AddrDelta); 771245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola } 772245a1e20419aa5a3c833d7a8e89168e19d5f4d2cRafael Espindola} 773