X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCDwarf.cpp;h=91864fb7a8a8d3debcc733c114464c6986783b78;hb=2684d9e3c702b2ef9fd430155d94671d12fa994f;hp=566c090feba7ee25c124f80ce3e585b7b36ac6e3;hpb=9266cc400ee2fc86abb24ab0819d9da280fb61c4;p=oota-llvm.git diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp index 566c090feba..91864fb7a8a 100644 --- a/lib/MC/MCDwarf.cpp +++ b/lib/MC/MCDwarf.cpp @@ -7,21 +7,24 @@ // //===----------------------------------------------------------------------===// -#include "llvm/ADT/FoldingSet.h" -#include "llvm/MC/MCAsmInfo.h" #include "llvm/MC/MCDwarf.h" -#include "llvm/MC/MCAssembler.h" +#include "llvm/MC/MCAsmInfo.h" +#include "llvm/MC/MCContext.h" +#include "llvm/MC/MCObjectFileInfo.h" +#include "llvm/MC/MCObjectWriter.h" +#include "llvm/MC/MCRegisterInfo.h" #include "llvm/MC/MCStreamer.h" #include "llvm/MC/MCSymbol.h" #include "llvm/MC/MCExpr.h" -#include "llvm/MC/MCContext.h" -#include "llvm/MC/MCObjectWriter.h" -#include "llvm/ADT/SmallString.h" #include "llvm/Support/Debug.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/raw_ostream.h" -#include "llvm/Target/TargetAsmBackend.h" -#include "llvm/Target/TargetAsmInfo.h" +#include "llvm/Support/Path.h" +#include "llvm/Support/SourceMgr.h" +#include "llvm/ADT/Hashing.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/Twine.h" +#include "llvm/Config/config.h" using namespace llvm; // Given a special op, return the address skip amount (in units of @@ -29,28 +32,27 @@ using namespace llvm; #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) // The maximum address skip amount that can be encoded with a special op. -#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) +#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) // First special line opcode - leave room for the standard opcodes. // Note: If you want to change this, you'll have to update the -// "standard_opcode_lengths" table that is emitted in DwarfFileTable::Emit(). -#define DWARF2_LINE_OPCODE_BASE 13 +// "standard_opcode_lengths" table that is emitted in DwarfFileTable::Emit(). +#define DWARF2_LINE_OPCODE_BASE 13 // Minimum line offset in a special line info. opcode. This value // was chosen to give a reasonable range of values. -#define DWARF2_LINE_BASE -5 +#define DWARF2_LINE_BASE -5 // Range of line offsets in a special line info. opcode. -# define DWARF2_LINE_RANGE 14 +#define DWARF2_LINE_RANGE 14 // Define the architecture-dependent minimum instruction length (in bytes). // This value should be rather too small than too big. -# define DWARF2_LINE_MIN_INSN_LENGTH 1 +#define DWARF2_LINE_MIN_INSN_LENGTH 1 // Note: when DWARF2_LINE_MIN_INSN_LENGTH == 1 which is the current setting, // this routine is a nop and will be optimized away. -static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta) -{ +static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta) { if (DWARF2_LINE_MIN_INSN_LENGTH == 1) return AddrDelta; if (AddrDelta % DWARF2_LINE_MIN_INSN_LENGTH != 0) { @@ -103,7 +105,7 @@ void MCLineEntry::Make(MCStreamer *MCOS, const MCSection *Section) { // // This helper routine returns an expression of End - Start + IntVal . -// +// static inline const MCExpr *MakeStartMinusEndExpr(const MCStreamer &MCOS, const MCSymbol &Start, const MCSymbol &End, @@ -173,7 +175,9 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS, // At this point we want to emit/create the sequence to encode the delta in // line numbers and the increment of the address from the previous Label // and the current Label. - MCOS->EmitDwarfAdvanceLineAddr(LineDelta, LastLabel, Label); + const MCAsmInfo &asmInfo = MCOS->getContext().getAsmInfo(); + MCOS->EmitDwarfAdvanceLineAddr(LineDelta, LastLabel, Label, + asmInfo.getPointerSize()); LastLine = it->getLine(); LastLabel = Label; @@ -195,18 +199,20 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS, MCOS->EmitLabel(SectionEnd); // Switch back the the dwarf line section. - MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection()); + MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfLineSection()); - MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd); + const MCAsmInfo &asmInfo = MCOS->getContext().getAsmInfo(); + MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd, + asmInfo.getPointerSize()); } // // This emits the Dwarf file and the line tables. // -void MCDwarfFileTable::Emit(MCStreamer *MCOS) { +const MCSymbol *MCDwarfFileTable::Emit(MCStreamer *MCOS) { MCContext &context = MCOS->getContext(); // Switch to the section where the table will be emitted into. - MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection()); + MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfLineSection()); // Create a symbol at the beginning of this section. MCSymbol *LineStartSym = context.CreateTempSymbol(); @@ -290,7 +296,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS) { const std::vector &MCLineSectionOrder = MCOS->getContext().getMCLineSectionOrder(); for (std::vector::const_iterator it = - MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie; + MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie; ++it) { const MCSection *Sec = *it; const MCLineSection *Line = MCLineSections.lookup(Sec); @@ -304,7 +310,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS) { if (MCOS->getContext().getAsmInfo().getLinkerRequiresNonEmptyDwarfLines() && MCLineSectionOrder.begin() == MCLineSectionOrder.end()) { // The darwin9 linker has a bug (see PR8715). For for 32-bit architectures - // it requires: + // it requires: // total_length >= prologue_length + 10 // We are 4 bytes short, since we have total_length = 51 and // prologue_length = 45 @@ -316,6 +322,8 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS) { // This is the end of the section, so set the value of the symbol at the end // of this section (that was used in a previous expression). MCOS->EmitLabel(LineEndSym); + + return LineStartSym; } /// Utility function to write the encoding to an object writer. @@ -346,17 +354,14 @@ void MCDwarfLineAddr::Encode(int64_t LineDelta, uint64_t AddrDelta, AddrDelta = ScaleAddrDelta(AddrDelta); // A LineDelta of INT64_MAX is a signal that this is actually a - // DW_LNE_end_sequence. We cannot use special opcodes here, since we want the + // DW_LNE_end_sequence. We cannot use special opcodes here, since we want the // end_sequence to emit the matrix entry. if (LineDelta == INT64_MAX) { if (AddrDelta == MAX_SPECIAL_ADDR_DELTA) OS << char(dwarf::DW_LNS_const_add_pc); else { OS << char(dwarf::DW_LNS_advance_pc); - SmallString<32> Tmp; - raw_svector_ostream OSE(Tmp); - MCObjectWriter::EncodeULEB128(AddrDelta, OSE); - OS << OSE.str(); + MCObjectWriter::EncodeULEB128(AddrDelta, OS); } OS << char(dwarf::DW_LNS_extended_op); OS << char(1); @@ -371,10 +376,7 @@ void MCDwarfLineAddr::Encode(int64_t LineDelta, uint64_t AddrDelta, // it with DW_LNS_advance_line. if (Temp >= DWARF2_LINE_RANGE) { OS << char(dwarf::DW_LNS_advance_line); - SmallString<32> Tmp; - raw_svector_ostream OSE(Tmp); - MCObjectWriter::EncodeSLEB128(LineDelta, OSE); - OS << OSE.str(); + MCObjectWriter::EncodeSLEB128(LineDelta, OS); LineDelta = 0; Temp = 0 - DWARF2_LINE_BASE; @@ -410,10 +412,7 @@ void MCDwarfLineAddr::Encode(int64_t LineDelta, uint64_t AddrDelta, // Otherwise use DW_LNS_advance_pc. OS << char(dwarf::DW_LNS_advance_pc); - SmallString<32> Tmp; - raw_svector_ostream OSE(Tmp); - MCObjectWriter::EncodeULEB128(AddrDelta, OSE); - OS << OSE.str(); + MCObjectWriter::EncodeULEB128(AddrDelta, OS); if (NeedCopy) OS << char(dwarf::DW_LNS_copy); @@ -429,27 +428,368 @@ void MCDwarfFile::dump() const { print(dbgs()); } +// Utility function to write a tuple for .debug_abbrev. +static void EmitAbbrev(MCStreamer *MCOS, uint64_t Name, uint64_t Form) { + MCOS->EmitULEB128IntValue(Name); + MCOS->EmitULEB128IntValue(Form); +} + +// When generating dwarf for assembly source files this emits +// the data for .debug_abbrev section which contains three DIEs. +static void EmitGenDwarfAbbrev(MCStreamer *MCOS) { + MCContext &context = MCOS->getContext(); + MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfAbbrevSection()); + + // DW_TAG_compile_unit DIE abbrev (1). + MCOS->EmitULEB128IntValue(1); + MCOS->EmitULEB128IntValue(dwarf::DW_TAG_compile_unit); + MCOS->EmitIntValue(dwarf::DW_CHILDREN_yes, 1); + EmitAbbrev(MCOS, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4); + EmitAbbrev(MCOS, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr); + EmitAbbrev(MCOS, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr); + EmitAbbrev(MCOS, dwarf::DW_AT_name, dwarf::DW_FORM_string); + EmitAbbrev(MCOS, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string); + StringRef DwarfDebugFlags = context.getDwarfDebugFlags(); + if (!DwarfDebugFlags.empty()) + EmitAbbrev(MCOS, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string); + EmitAbbrev(MCOS, dwarf::DW_AT_producer, dwarf::DW_FORM_string); + EmitAbbrev(MCOS, dwarf::DW_AT_language, dwarf::DW_FORM_data2); + EmitAbbrev(MCOS, 0, 0); + + // DW_TAG_label DIE abbrev (2). + MCOS->EmitULEB128IntValue(2); + MCOS->EmitULEB128IntValue(dwarf::DW_TAG_label); + MCOS->EmitIntValue(dwarf::DW_CHILDREN_yes, 1); + EmitAbbrev(MCOS, dwarf::DW_AT_name, dwarf::DW_FORM_string); + EmitAbbrev(MCOS, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data4); + EmitAbbrev(MCOS, dwarf::DW_AT_decl_line, dwarf::DW_FORM_data4); + EmitAbbrev(MCOS, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr); + EmitAbbrev(MCOS, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag); + EmitAbbrev(MCOS, 0, 0); + + // DW_TAG_unspecified_parameters DIE abbrev (3). + MCOS->EmitULEB128IntValue(3); + MCOS->EmitULEB128IntValue(dwarf::DW_TAG_unspecified_parameters); + MCOS->EmitIntValue(dwarf::DW_CHILDREN_no, 1); + EmitAbbrev(MCOS, 0, 0); + + // Terminate the abbreviations for this compilation unit. + MCOS->EmitIntValue(0, 1); +} + +// When generating dwarf for assembly source files this emits the data for +// .debug_aranges section. Which contains a header and a table of pairs of +// PointerSize'ed values for the address and size of section(s) with line table +// entries (just the default .text in our case) and a terminating pair of zeros. +static void EmitGenDwarfAranges(MCStreamer *MCOS) { + MCContext &context = MCOS->getContext(); + + // Create a symbol at the end of the section that we are creating the dwarf + // debugging info to use later in here as part of the expression to calculate + // the size of the section for the table. + MCOS->SwitchSection(context.getGenDwarfSection()); + MCSymbol *SectionEndSym = context.CreateTempSymbol(); + MCOS->EmitLabel(SectionEndSym); + context.setGenDwarfSectionEndSym(SectionEndSym); + + MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfARangesSection()); + + // This will be the length of the .debug_aranges section, first account for + // the size of each item in the header (see below where we emit these items). + int Length = 4 + 2 + 4 + 1 + 1; + + // Figure the padding after the header before the table of address and size + // pairs who's values are PointerSize'ed. + const MCAsmInfo &asmInfo = context.getAsmInfo(); + int AddrSize = asmInfo.getPointerSize(); + int Pad = 2 * AddrSize - (Length & (2 * AddrSize - 1)); + if (Pad == 2 * AddrSize) + Pad = 0; + Length += Pad; + + // Add the size of the pair of PointerSize'ed values for the address and size + // of the one default .text section we have in the table. + Length += 2 * AddrSize; + // And the pair of terminating zeros. + Length += 2 * AddrSize; + + + // Emit the header for this section. + // The 4 byte length not including the 4 byte value for the length. + MCOS->EmitIntValue(Length - 4, 4); + // The 2 byte version, which is 2. + MCOS->EmitIntValue(2, 2); + // The 4 byte offset to the compile unit in the .debug_info from the start + // of the .debug_info, it is at the start of that section so this is zero. + MCOS->EmitIntValue(0, 4); + // The 1 byte size of an address. + MCOS->EmitIntValue(AddrSize, 1); + // The 1 byte size of a segment descriptor, we use a value of zero. + MCOS->EmitIntValue(0, 1); + // Align the header with the padding if needed, before we put out the table. + for(int i = 0; i < Pad; i++) + MCOS->EmitIntValue(0, 1); + + // Now emit the table of pairs of PointerSize'ed values for the section(s) + // address and size, in our case just the one default .text section. + const MCExpr *Addr = MCSymbolRefExpr::Create( + context.getGenDwarfSectionStartSym(), MCSymbolRefExpr::VK_None, context); + const MCExpr *Size = MakeStartMinusEndExpr(*MCOS, + *context.getGenDwarfSectionStartSym(), *SectionEndSym, 0); + MCOS->EmitAbsValue(Addr, AddrSize); + MCOS->EmitAbsValue(Size, AddrSize); + + // And finally the pair of terminating zeros. + MCOS->EmitIntValue(0, AddrSize); + MCOS->EmitIntValue(0, AddrSize); +} + +// When generating dwarf for assembly source files this emits the data for +// .debug_info section which contains three parts. The header, the compile_unit +// DIE and a list of label DIEs. +static void EmitGenDwarfInfo(MCStreamer *MCOS, + const MCSymbol *AbbrevSectionSymbol, + const MCSymbol *LineSectionSymbol) { + MCContext &context = MCOS->getContext(); + + MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfInfoSection()); + + // Create a symbol at the start and end of this section used in here for the + // expression to calculate the length in the header. + MCSymbol *InfoStart = context.CreateTempSymbol(); + MCOS->EmitLabel(InfoStart); + MCSymbol *InfoEnd = context.CreateTempSymbol(); + + // First part: the header. + + // The 4 byte total length of the information for this compilation unit, not + // including these 4 bytes. + const MCExpr *Length = MakeStartMinusEndExpr(*MCOS, *InfoStart, *InfoEnd, 4); + MCOS->EmitAbsValue(Length, 4); + + // The 2 byte DWARF version, which is 2. + MCOS->EmitIntValue(2, 2); + + // The 4 byte offset to the debug abbrevs from the start of the .debug_abbrev, + // it is at the start of that section so this is zero. + if (AbbrevSectionSymbol) { + MCOS->EmitSymbolValue(AbbrevSectionSymbol, 4); + } else { + MCOS->EmitIntValue(0, 4); + } + + const MCAsmInfo &asmInfo = context.getAsmInfo(); + int AddrSize = asmInfo.getPointerSize(); + // The 1 byte size of an address. + MCOS->EmitIntValue(AddrSize, 1); + + // Second part: the compile_unit DIE. + + // The DW_TAG_compile_unit DIE abbrev (1). + MCOS->EmitULEB128IntValue(1); + + // DW_AT_stmt_list, a 4 byte offset from the start of the .debug_line section, + // which is at the start of that section so this is zero. + if (LineSectionSymbol) { + MCOS->EmitSymbolValue(LineSectionSymbol, 4); + } else { + MCOS->EmitIntValue(0, 4); + } + + // AT_low_pc, the first address of the default .text section. + const MCExpr *Start = MCSymbolRefExpr::Create( + context.getGenDwarfSectionStartSym(), MCSymbolRefExpr::VK_None, context); + MCOS->EmitAbsValue(Start, AddrSize); + + // AT_high_pc, the last address of the default .text section. + const MCExpr *End = MCSymbolRefExpr::Create( + context.getGenDwarfSectionEndSym(), MCSymbolRefExpr::VK_None, context); + MCOS->EmitAbsValue(End, AddrSize); + + // AT_name, the name of the source file. Reconstruct from the first directory + // and file table entries. + const std::vector &MCDwarfDirs = + context.getMCDwarfDirs(); + if (MCDwarfDirs.size() > 0) { + MCOS->EmitBytes(MCDwarfDirs[0], 0); + MCOS->EmitBytes("/", 0); + } + const std::vector &MCDwarfFiles = + MCOS->getContext().getMCDwarfFiles(); + MCOS->EmitBytes(MCDwarfFiles[1]->getName(), 0); + MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string. + + // AT_comp_dir, the working directory the assembly was done in. + llvm::sys::Path CWD = llvm::sys::Path::GetCurrentDirectory(); + MCOS->EmitBytes(StringRef(CWD.c_str()), 0); + MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string. + + // AT_APPLE_flags, the command line arguments of the assembler tool. + StringRef DwarfDebugFlags = context.getDwarfDebugFlags(); + if (!DwarfDebugFlags.empty()){ + MCOS->EmitBytes(DwarfDebugFlags, 0); + MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string. + } + + // AT_producer, the version of the assembler tool. + MCOS->EmitBytes(StringRef("llvm-mc (based on LLVM "), 0); + MCOS->EmitBytes(StringRef(PACKAGE_VERSION), 0); + MCOS->EmitBytes(StringRef(")"), 0); + MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string. + + // AT_language, a 4 byte value. We use DW_LANG_Mips_Assembler as the dwarf2 + // draft has no standard code for assembler. + MCOS->EmitIntValue(dwarf::DW_LANG_Mips_Assembler, 2); + + // Third part: the list of label DIEs. + + // Loop on saved info for dwarf labels and create the DIEs for them. + const std::vector &Entries = + MCOS->getContext().getMCGenDwarfLabelEntries(); + for (std::vector::const_iterator it = + Entries.begin(), ie = Entries.end(); it != ie; + ++it) { + const MCGenDwarfLabelEntry *Entry = *it; + + // The DW_TAG_label DIE abbrev (2). + MCOS->EmitULEB128IntValue(2); + + // AT_name, of the label without any leading underbar. + MCOS->EmitBytes(Entry->getName(), 0); + MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string. + + // AT_decl_file, index into the file table. + MCOS->EmitIntValue(Entry->getFileNumber(), 4); + + // AT_decl_line, source line number. + MCOS->EmitIntValue(Entry->getLineNumber(), 4); + + // AT_low_pc, start address of the label. + const MCExpr *AT_low_pc = MCSymbolRefExpr::Create(Entry->getLabel(), + MCSymbolRefExpr::VK_None, context); + MCOS->EmitAbsValue(AT_low_pc, AddrSize); + + // DW_AT_prototyped, a one byte flag value of 0 saying we have no prototype. + MCOS->EmitIntValue(0, 1); + + // The DW_TAG_unspecified_parameters DIE abbrev (3). + MCOS->EmitULEB128IntValue(3); + + // Add the NULL DIE terminating the DW_TAG_unspecified_parameters DIE's. + MCOS->EmitIntValue(0, 1); + } + // Deallocate the MCGenDwarfLabelEntry classes that saved away the info + // for the dwarf labels. + for (std::vector::const_iterator it = + Entries.begin(), ie = Entries.end(); it != ie; + ++it) { + const MCGenDwarfLabelEntry *Entry = *it; + delete Entry; + } + + // Add the NULL DIE terminating the Compile Unit DIE's. + MCOS->EmitIntValue(0, 1); + + // Now set the value of the symbol at the end of the info section. + MCOS->EmitLabel(InfoEnd); +} + +// +// When generating dwarf for assembly source files this emits the Dwarf +// sections. +// +void MCGenDwarfInfo::Emit(MCStreamer *MCOS, const MCSymbol *LineSectionSymbol) { + // Create the dwarf sections in this order (.debug_line already created). + MCContext &context = MCOS->getContext(); + const MCAsmInfo &AsmInfo = context.getAsmInfo(); + MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfInfoSection()); + MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfAbbrevSection()); + MCSymbol *AbbrevSectionSymbol; + if (AsmInfo.doesDwarfRequireRelocationForSectionOffset()) { + AbbrevSectionSymbol = context.CreateTempSymbol(); + MCOS->EmitLabel(AbbrevSectionSymbol); + } else { + AbbrevSectionSymbol = NULL; + LineSectionSymbol = NULL; + } + MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfARangesSection()); + + // If there are no line table entries then do not emit any section contents. + if (context.getMCLineSections().empty()) + return; + + // Output the data for .debug_aranges section. + EmitGenDwarfAranges(MCOS); + + // Output the data for .debug_abbrev section. + EmitGenDwarfAbbrev(MCOS); + + // Output the data for .debug_info section. + EmitGenDwarfInfo(MCOS, AbbrevSectionSymbol, LineSectionSymbol); +} + +// +// When generating dwarf for assembly source files this is called when symbol +// for a label is created. If this symbol is not a temporary and is in the +// section that dwarf is being generated for, save the needed info to create +// a dwarf label. +// +void MCGenDwarfLabelEntry::Make(MCSymbol *Symbol, MCStreamer *MCOS, + SourceMgr &SrcMgr, SMLoc &Loc) { + // We won't create dwarf labels for temporary symbols or symbols not in + // the default text. + if (Symbol->isTemporary()) + return; + MCContext &context = MCOS->getContext(); + if (context.getGenDwarfSection() != MCOS->getCurrentSection()) + return; + + // The dwarf label's name does not have the symbol name's leading + // underbar if any. + StringRef Name = Symbol->getName(); + if (Name.startswith("_")) + Name = Name.substr(1, Name.size()-1); + + // Get the dwarf file number to be used for the dwarf label. + unsigned FileNumber = context.getGenDwarfFileNumber(); + + // Finding the line number is the expensive part which is why we just don't + // pass it in as for some symbols we won't create a dwarf label. + int CurBuffer = SrcMgr.FindBufferContainingLoc(Loc); + unsigned LineNumber = SrcMgr.FindLineNumber(Loc, CurBuffer); + + // We create a temporary symbol for use for the AT_high_pc and AT_low_pc + // values so that they don't have things like an ARM thumb bit from the + // original symbol. So when used they won't get a low bit set after + // relocation. + MCSymbol *Label = context.CreateTempSymbol(); + MCOS->EmitLabel(Label); + + // Create and entry for the info and add it to the other entries. + MCGenDwarfLabelEntry *Entry = + new MCGenDwarfLabelEntry(Name, FileNumber, LineNumber, Label); + MCOS->getContext().addMCGenDwarfLabelEntry(Entry); +} + static int getDataAlignmentFactor(MCStreamer &streamer) { MCContext &context = streamer.getContext(); - const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); + const MCAsmInfo &asmInfo = context.getAsmInfo(); int size = asmInfo.getPointerSize(); - if (asmInfo.getStackGrowthDirection() == TargetFrameLowering::StackGrowsUp) + if (asmInfo.isStackGrowthDirectionUp()) return size; - else - return -size; + else + return -size; } static unsigned getSizeForEncoding(MCStreamer &streamer, unsigned symbolEncoding) { MCContext &context = streamer.getContext(); - const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); unsigned format = symbolEncoding & 0x0f; switch (format) { - default: - assert(0 && "Unknown Encoding"); + default: llvm_unreachable("Unknown Encoding"); case dwarf::DW_EH_PE_absptr: case dwarf::DW_EH_PE_signed: - return asmInfo.getPointerSize(); + return context.getAsmInfo().getPointerSize(); case dwarf::DW_EH_PE_udata2: case dwarf::DW_EH_PE_sdata2: return 2; @@ -463,28 +803,34 @@ static unsigned getSizeForEncoding(MCStreamer &streamer, } static void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol, - unsigned symbolEncoding) { + unsigned symbolEncoding, const char *comment = 0) { + MCContext &context = streamer.getContext(); + const MCAsmInfo &asmInfo = context.getAsmInfo(); + const MCExpr *v = asmInfo.getExprForFDESymbol(&symbol, + symbolEncoding, + streamer); unsigned size = getSizeForEncoding(streamer, symbolEncoding); - unsigned application = symbolEncoding & 0x70; - switch (application) { - default: - assert(0 && "Unknown Encoding"); - break; - case 0: - streamer.EmitSymbolValue(&symbol, size); - break; - case dwarf::DW_EH_PE_pcrel: - streamer.EmitPCRelSymbolValue(&symbol, size); - break; - } + if (streamer.isVerboseAsm() && comment) streamer.AddComment(comment); + streamer.EmitAbsValue(v, size); +} + +static void EmitPersonality(MCStreamer &streamer, const MCSymbol &symbol, + unsigned symbolEncoding) { + MCContext &context = streamer.getContext(); + const MCAsmInfo &asmInfo = context.getAsmInfo(); + const MCExpr *v = asmInfo.getExprForPersonalitySymbol(&symbol, + symbolEncoding, + streamer); + unsigned size = getSizeForEncoding(streamer, symbolEncoding); + streamer.EmitValue(v, size); } static const MachineLocation TranslateMachineLocation( - const TargetAsmInfo &AsmInfo, + const MCRegisterInfo &MRI, const MachineLocation &Loc) { unsigned Reg = Loc.getReg() == MachineLocation::VirtualFP ? MachineLocation::VirtualFP : - unsigned(AsmInfo.getDwarfRegNum(Loc.getReg(), true)); + unsigned(MRI.getDwarfRegNum(Loc.getReg(), true)); const MachineLocation &NewLoc = Loc.isReg() ? MachineLocation(Reg) : MachineLocation(Reg, Loc.getOffset()); return NewLoc; @@ -493,15 +839,28 @@ static const MachineLocation TranslateMachineLocation( namespace { class FrameEmitterImpl { int CFAOffset; - + int CIENum; + bool UsingCFI; + bool IsEH; + const MCSymbol *SectionStart; public: - FrameEmitterImpl() : CFAOffset(0) { - } + FrameEmitterImpl(bool usingCFI, bool isEH) + : CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH), + SectionStart(0) {} + + void setSectionStart(const MCSymbol *Label) { SectionStart = Label; } + + /// EmitCompactUnwind - Emit the unwind information in a compact way. If + /// we're successful, return 'true'. Otherwise, return 'false' and it will + /// emit the normal CIE and FDE. + bool EmitCompactUnwind(MCStreamer &streamer, + const MCDwarfFrameInfo &frame); const MCSymbol &EmitCIE(MCStreamer &streamer, const MCSymbol *personality, unsigned personalityEncoding, const MCSymbol *lsda, + bool IsSignalFrame, unsigned lsdaEncoding); MCSymbol *EmitFDE(MCStreamer &streamer, const MCSymbol &cieStart, @@ -512,11 +871,58 @@ namespace { void EmitCFIInstruction(MCStreamer &Streamer, const MCCFIInstruction &Instr); }; + +} // end anonymous namespace + +static void EmitEncodingByte(MCStreamer &Streamer, unsigned Encoding, + StringRef Prefix) { + if (Streamer.isVerboseAsm()) { + const char *EncStr; + switch (Encoding) { + default: EncStr = ""; break; + case dwarf::DW_EH_PE_absptr: EncStr = "absptr"; break; + case dwarf::DW_EH_PE_omit: EncStr = "omit"; break; + case dwarf::DW_EH_PE_pcrel: EncStr = "pcrel"; break; + case dwarf::DW_EH_PE_udata4: EncStr = "udata4"; break; + case dwarf::DW_EH_PE_udata8: EncStr = "udata8"; break; + case dwarf::DW_EH_PE_sdata4: EncStr = "sdata4"; break; + case dwarf::DW_EH_PE_sdata8: EncStr = "sdata8"; break; + case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4: + EncStr = "pcrel udata4"; + break; + case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4: + EncStr = "pcrel sdata4"; + break; + case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8: + EncStr = "pcrel udata8"; + break; + case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8: + EncStr = "screl sdata8"; + break; + case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata4: + EncStr = "indirect pcrel udata4"; + break; + case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata4: + EncStr = "indirect pcrel sdata4"; + break; + case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata8: + EncStr = "indirect pcrel udata8"; + break; + case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata8: + EncStr = "indirect pcrel sdata8"; + break; + } + + Streamer.AddComment(Twine(Prefix) + " = " + EncStr); + } + + Streamer.EmitIntValue(Encoding, 1); } void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer, const MCCFIInstruction &Instr) { int dataAlignmentFactor = getDataAlignmentFactor(Streamer); + bool VerboseAsm = Streamer.isVerboseAsm(); switch (Instr.getOperation()) { case MCCFIInstruction::Move: @@ -527,12 +933,14 @@ void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer, // If advancing cfa. if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) { - assert(!Src.isReg() && "Machine move not supported yet."); - if (Src.getReg() == MachineLocation::VirtualFP) { + if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_offset"); Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1); } else { + if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa"); Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1); + if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + + Twine(Src.getReg())); Streamer.EmitULEB128IntValue(Src.getReg()); } @@ -541,50 +949,78 @@ void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer, else CFAOffset = -Src.getOffset(); + if (VerboseAsm) Streamer.AddComment(Twine("Offset " + Twine(CFAOffset))); Streamer.EmitULEB128IntValue(CFAOffset); return; } if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) { assert(Dst.isReg() && "Machine move not supported yet."); + if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_register"); Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1); + if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Dst.getReg())); Streamer.EmitULEB128IntValue(Dst.getReg()); return; } unsigned Reg = Src.getReg(); - int Offset = Dst.getOffset(); if (IsRelative) Offset -= CFAOffset; Offset = Offset / dataAlignmentFactor; if (Offset < 0) { + if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended_sf"); Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1); + if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg)); Streamer.EmitULEB128IntValue(Reg); + if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset)); Streamer.EmitSLEB128IntValue(Offset); } else if (Reg < 64) { + if (VerboseAsm) Streamer.AddComment(Twine("DW_CFA_offset + Reg(") + + Twine(Reg) + ")"); Streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1); + if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset)); Streamer.EmitULEB128IntValue(Offset); } else { + if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended"); Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1); + if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg)); Streamer.EmitULEB128IntValue(Reg); + if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset)); Streamer.EmitULEB128IntValue(Offset); } return; } - case MCCFIInstruction::Remember: + case MCCFIInstruction::RememberState: + if (VerboseAsm) Streamer.AddComment("DW_CFA_remember_state"); Streamer.EmitIntValue(dwarf::DW_CFA_remember_state, 1); return; - case MCCFIInstruction::Restore: + case MCCFIInstruction::RestoreState: + if (VerboseAsm) Streamer.AddComment("DW_CFA_restore_state"); Streamer.EmitIntValue(dwarf::DW_CFA_restore_state, 1); return; case MCCFIInstruction::SameValue: { unsigned Reg = Instr.getDestination().getReg(); + if (VerboseAsm) Streamer.AddComment("DW_CFA_same_value"); Streamer.EmitIntValue(dwarf::DW_CFA_same_value, 1); + if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg)); Streamer.EmitULEB128IntValue(Reg); return; } + case MCCFIInstruction::Restore: { + unsigned Reg = Instr.getDestination().getReg(); + if (VerboseAsm) { + Streamer.AddComment("DW_CFA_restore"); + Streamer.AddComment(Twine("Reg ") + Twine(Reg)); + } + Streamer.EmitIntValue(dwarf::DW_CFA_restore | Reg, 1); + return; + } + case MCCFIInstruction::Escape: + if (VerboseAsm) Streamer.AddComment("Escape bytes"); + Streamer.EmitBytes(Instr.getValues(), 0); + return; } llvm_unreachable("Unhandled case in switch"); } @@ -604,6 +1040,7 @@ void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer, if (BaseLabel && Label) { MCSymbol *ThisSym = Label; if (ThisSym != BaseLabel) { + if (streamer.isVerboseAsm()) streamer.AddComment("DW_CFA_advance_loc4"); streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym); BaseLabel = ThisSym; } @@ -613,85 +1050,197 @@ void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer, } } +/// EmitCompactUnwind - Emit the unwind information in a compact way. If we're +/// successful, return 'true'. Otherwise, return 'false' and it will emit the +/// normal CIE and FDE. +bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer, + const MCDwarfFrameInfo &Frame) { + MCContext &Context = Streamer.getContext(); + const MCObjectFileInfo *MOFI = Context.getObjectFileInfo(); + bool VerboseAsm = Streamer.isVerboseAsm(); + + // range-start range-length compact-unwind-enc personality-func lsda + // _foo LfooEnd-_foo 0x00000023 0 0 + // _bar LbarEnd-_bar 0x00000025 __gxx_personality except_tab1 + // + // .section __LD,__compact_unwind,regular,debug + // + // # compact unwind for _foo + // .quad _foo + // .set L1,LfooEnd-_foo + // .long L1 + // .long 0x01010001 + // .quad 0 + // .quad 0 + // + // # compact unwind for _bar + // .quad _bar + // .set L2,LbarEnd-_bar + // .long L2 + // .long 0x01020011 + // .quad __gxx_personality + // .quad except_tab1 + + uint32_t Encoding = Frame.CompactUnwindEncoding; + if (!Encoding) return false; + + // The encoding needs to know we have an LSDA. + if (Frame.Lsda) + Encoding |= 0x40000000; + + Streamer.SwitchSection(MOFI->getCompactUnwindSection()); + + // Range Start + unsigned FDEEncoding = MOFI->getFDEEncoding(UsingCFI); + unsigned Size = getSizeForEncoding(Streamer, FDEEncoding); + if (VerboseAsm) Streamer.AddComment("Range Start"); + Streamer.EmitSymbolValue(Frame.Function, Size); + + // Range Length + const MCExpr *Range = MakeStartMinusEndExpr(Streamer, *Frame.Begin, + *Frame.End, 0); + if (VerboseAsm) Streamer.AddComment("Range Length"); + Streamer.EmitAbsValue(Range, 4); + + // Compact Encoding + Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_udata4); + if (VerboseAsm) Streamer.AddComment("Compact Unwind Encoding: 0x" + + Twine::utohexstr(Encoding)); + Streamer.EmitIntValue(Encoding, Size); + + + // Personality Function + Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_absptr); + if (VerboseAsm) Streamer.AddComment("Personality Function"); + if (Frame.Personality) + Streamer.EmitSymbolValue(Frame.Personality, Size); + else + Streamer.EmitIntValue(0, Size); // No personality fn + + // LSDA + Size = getSizeForEncoding(Streamer, Frame.LsdaEncoding); + if (VerboseAsm) Streamer.AddComment("LSDA"); + if (Frame.Lsda) + Streamer.EmitSymbolValue(Frame.Lsda, Size); + else + Streamer.EmitIntValue(0, Size); // No LSDA + + return true; +} + const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, const MCSymbol *personality, unsigned personalityEncoding, const MCSymbol *lsda, + bool IsSignalFrame, unsigned lsdaEncoding) { MCContext &context = streamer.getContext(); - const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); - const MCSection §ion = *asmInfo.getEHFrameSection(); - streamer.SwitchSection(§ion); - MCSymbol *sectionStart = context.CreateTempSymbol(); - MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol(); + const MCRegisterInfo &MRI = context.getRegisterInfo(); + const MCObjectFileInfo *MOFI = context.getObjectFileInfo(); + bool verboseAsm = streamer.isVerboseAsm(); + + MCSymbol *sectionStart; + if (MOFI->isFunctionEHFrameSymbolPrivate() || !IsEH) + sectionStart = context.CreateTempSymbol(); + else + sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum)); + + streamer.EmitLabel(sectionStart); + CIENum++; + + MCSymbol *sectionEnd = context.CreateTempSymbol(); // Length const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart, *sectionEnd, 4); - streamer.EmitLabel(sectionStart); + if (verboseAsm) streamer.AddComment("CIE Length"); streamer.EmitAbsValue(Length, 4); // CIE ID - streamer.EmitIntValue(0, 4); + unsigned CIE_ID = IsEH ? 0 : -1; + if (verboseAsm) streamer.AddComment("CIE ID Tag"); + streamer.EmitIntValue(CIE_ID, 4); // Version + if (verboseAsm) streamer.AddComment("DW_CIE_VERSION"); streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1); // Augmentation String SmallString<8> Augmentation; - Augmentation += "z"; - if (personality) - Augmentation += "P"; - if (lsda) - Augmentation += "L"; - Augmentation += "R"; - streamer.EmitBytes(Augmentation.str(), 0); + if (IsEH) { + if (verboseAsm) streamer.AddComment("CIE Augmentation"); + Augmentation += "z"; + if (personality) + Augmentation += "P"; + if (lsda) + Augmentation += "L"; + Augmentation += "R"; + if (IsSignalFrame) + Augmentation += "S"; + streamer.EmitBytes(Augmentation.str(), 0); + } streamer.EmitIntValue(0, 1); // Code Alignment Factor + if (verboseAsm) streamer.AddComment("CIE Code Alignment Factor"); streamer.EmitULEB128IntValue(1); // Data Alignment Factor + if (verboseAsm) streamer.AddComment("CIE Data Alignment Factor"); streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer)); // Return Address Register - streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true)); + if (verboseAsm) streamer.AddComment("CIE Return Address Column"); + streamer.EmitULEB128IntValue(MRI.getDwarfRegNum(MRI.getRARegister(), true)); // Augmentation Data Length (optional) - MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol(); - MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol(); - const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer, - *augmentationStart, - *augmentationEnd, 0); - streamer.EmitULEB128Value(augmentationLength); - - // Augmentation Data (optional) - streamer.EmitLabel(augmentationStart); - if (personality) { - // Personality Encoding - streamer.EmitIntValue(personalityEncoding, 1); - // Personality - EmitSymbol(streamer, *personality, personalityEncoding); - } - if (lsda) { - // LSDA Encoding - streamer.EmitIntValue(lsdaEncoding, 1); - } - // Encoding of the FDE pointers - streamer.EmitIntValue(asmInfo.getFDEEncoding(), 1); - streamer.EmitLabel(augmentationEnd); + + unsigned augmentationLength = 0; + if (IsEH) { + if (personality) { + // Personality Encoding + augmentationLength += 1; + // Personality + augmentationLength += getSizeForEncoding(streamer, personalityEncoding); + } + if (lsda) + augmentationLength += 1; + // Encoding of the FDE pointers + augmentationLength += 1; + + if (verboseAsm) streamer.AddComment("Augmentation Size"); + streamer.EmitULEB128IntValue(augmentationLength); + + // Augmentation Data (optional) + if (personality) { + // Personality Encoding + EmitEncodingByte(streamer, personalityEncoding, + "Personality Encoding"); + // Personality + if (verboseAsm) streamer.AddComment("Personality"); + EmitPersonality(streamer, *personality, personalityEncoding); + } + + if (lsda) + EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding"); + + // Encoding of the FDE pointers + EmitEncodingByte(streamer, MOFI->getFDEEncoding(UsingCFI), + "FDE Encoding"); + } // Initial Instructions - const std::vector Moves = asmInfo.getInitialFrameState(); + const MCAsmInfo &MAI = context.getAsmInfo(); + const std::vector &Moves = MAI.getInitialFrameState(); std::vector Instructions; for (int i = 0, n = Moves.size(); i != n; ++i) { MCSymbol *Label = Moves[i].getLabel(); const MachineLocation &Dst = - TranslateMachineLocation(asmInfo, Moves[i].getDestination()); + TranslateMachineLocation(MRI, Moves[i].getDestination()); const MachineLocation &Src = - TranslateMachineLocation(asmInfo, Moves[i].getSource()); + TranslateMachineLocation(MRI, Moves[i].getSource()); MCCFIInstruction Inst(Label, Dst, Src); Instructions.push_back(Inst); } @@ -699,7 +1248,8 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer, EmitCFIInstructions(streamer, Instructions, NULL); // Padding - streamer.EmitValueToAlignment(4); + streamer.EmitValueToAlignment(IsEH + ? 4 : context.getAsmInfo().getPointerSize()); streamer.EmitLabel(sectionEnd); return *sectionStart; @@ -711,64 +1261,93 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer, MCContext &context = streamer.getContext(); MCSymbol *fdeStart = context.CreateTempSymbol(); MCSymbol *fdeEnd = context.CreateTempSymbol(); - const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); + const MCObjectFileInfo *MOFI = context.getObjectFileInfo(); + bool verboseAsm = streamer.isVerboseAsm(); + + if (IsEH && frame.Function && !MOFI->isFunctionEHFrameSymbolPrivate()) { + MCSymbol *EHSym = + context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh")); + streamer.EmitEHSymAttributes(frame.Function, EHSym); + streamer.EmitLabel(EHSym); + } // Length const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0); + if (verboseAsm) streamer.AddComment("FDE Length"); streamer.EmitAbsValue(Length, 4); streamer.EmitLabel(fdeStart); + // CIE Pointer - const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart, - 0); - streamer.EmitAbsValue(offset, 4); - unsigned fdeEncoding = asmInfo.getFDEEncoding(); + const MCAsmInfo &asmInfo = context.getAsmInfo(); + if (IsEH) { + const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart, + 0); + if (verboseAsm) streamer.AddComment("FDE CIE Offset"); + streamer.EmitAbsValue(offset, 4); + } else if (!asmInfo.doesDwarfRequireRelocationForSectionOffset()) { + const MCExpr *offset = MakeStartMinusEndExpr(streamer, *SectionStart, + cieStart, 0); + streamer.EmitAbsValue(offset, 4); + } else { + streamer.EmitSymbolValue(&cieStart, 4); + } + + unsigned fdeEncoding = MOFI->getFDEEncoding(UsingCFI); unsigned size = getSizeForEncoding(streamer, fdeEncoding); // PC Begin - streamer.EmitPCRelSymbolValue(frame.Begin, size); + unsigned PCBeginEncoding = IsEH ? fdeEncoding : + (unsigned)dwarf::DW_EH_PE_absptr; + unsigned PCBeginSize = getSizeForEncoding(streamer, PCBeginEncoding); + EmitSymbol(streamer, *frame.Begin, PCBeginEncoding, "FDE initial location"); // PC Range const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin, *frame.End, 0); + if (verboseAsm) streamer.AddComment("FDE address range"); streamer.EmitAbsValue(Range, size); - // Augmentation Data Length - MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol(); - MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol(); - const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer, - *augmentationStart, - *augmentationEnd, 0); - streamer.EmitULEB128Value(augmentationLength); - - // Augmentation Data - streamer.EmitLabel(augmentationStart); - if (frame.Lsda) - EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding); - streamer.EmitLabel(augmentationEnd); + if (IsEH) { + // Augmentation Data Length + unsigned augmentationLength = 0; + + if (frame.Lsda) + augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding); + + if (verboseAsm) streamer.AddComment("Augmentation size"); + streamer.EmitULEB128IntValue(augmentationLength); + + // Augmentation Data + if (frame.Lsda) + EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding, + "Language Specific Data Area"); + } + // Call Frame Instructions EmitCFIInstructions(streamer, frame.Instructions, frame.Begin); // Padding - streamer.EmitValueToAlignment(size); + streamer.EmitValueToAlignment(PCBeginSize); return fdeEnd; } namespace { struct CIEKey { - static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1); } - static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0); } + static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1, false); } + static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0, false); } CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_, - unsigned LsdaEncoding_) : Personality(Personality_), - PersonalityEncoding(PersonalityEncoding_), - LsdaEncoding(LsdaEncoding_) { + unsigned LsdaEncoding_, bool IsSignalFrame_) : + Personality(Personality_), PersonalityEncoding(PersonalityEncoding_), + LsdaEncoding(LsdaEncoding_), IsSignalFrame(IsSignalFrame_) { } const MCSymbol* Personality; unsigned PersonalityEncoding; unsigned LsdaEncoding; + bool IsSignalFrame; }; } @@ -782,45 +1361,69 @@ namespace llvm { return CIEKey::getTombstoneKey(); } static unsigned getHashValue(const CIEKey &Key) { - FoldingSetNodeID ID; - ID.AddPointer(Key.Personality); - ID.AddInteger(Key.PersonalityEncoding); - ID.AddInteger(Key.LsdaEncoding); - return ID.ComputeHash(); + return static_cast(hash_combine(Key.Personality, + Key.PersonalityEncoding, + Key.LsdaEncoding, + Key.IsSignalFrame)); } static bool isEqual(const CIEKey &LHS, const CIEKey &RHS) { return LHS.Personality == RHS.Personality && LHS.PersonalityEncoding == RHS.PersonalityEncoding && - LHS.LsdaEncoding == RHS.LsdaEncoding; + LHS.LsdaEncoding == RHS.LsdaEncoding && + LHS.IsSignalFrame == RHS.IsSignalFrame; } }; } -void MCDwarfFrameEmitter::Emit(MCStreamer &streamer) { - const MCContext &context = streamer.getContext(); - const TargetAsmInfo &asmInfo = context.getTargetAsmInfo(); - MCSymbol *fdeEnd = NULL; +void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer, + bool UsingCFI, + bool IsEH) { + MCContext &Context = Streamer.getContext(); + MCObjectFileInfo *MOFI = + const_cast(Context.getObjectFileInfo()); + FrameEmitterImpl Emitter(UsingCFI, IsEH); + ArrayRef FrameArray = Streamer.getFrameInfos(); + + // Emit the compact unwind info if available. + if (IsEH && MOFI->getCompactUnwindSection()) + for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) { + const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i); + if (Frame.CompactUnwindEncoding) + Emitter.EmitCompactUnwind(Streamer, Frame); + } + + const MCSection &Section = IsEH ? *MOFI->getEHFrameSection() : + *MOFI->getDwarfFrameSection(); + Streamer.SwitchSection(&Section); + MCSymbol *SectionStart = Context.CreateTempSymbol(); + Streamer.EmitLabel(SectionStart); + Emitter.setSectionStart(SectionStart); + + MCSymbol *FDEEnd = NULL; DenseMap CIEStarts; - FrameEmitterImpl Emitter; - - for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i) { - const MCDwarfFrameInfo &frame = streamer.getFrameInfo(i); - CIEKey key(frame.Personality, frame.PersonalityEncoding, - frame.LsdaEncoding); - const MCSymbol *&cieStart = CIEStarts[key]; - if (!cieStart) - cieStart = &Emitter.EmitCIE(streamer, frame.Personality, - frame.PersonalityEncoding, frame.Lsda, - frame.LsdaEncoding); - fdeEnd = Emitter.EmitFDE(streamer, *cieStart, frame); + + const MCSymbol *DummyDebugKey = NULL; + for (unsigned i = 0, n = FrameArray.size(); i < n; ++i) { + const MCDwarfFrameInfo &Frame = FrameArray[i]; + CIEKey Key(Frame.Personality, Frame.PersonalityEncoding, + Frame.LsdaEncoding, Frame.IsSignalFrame); + const MCSymbol *&CIEStart = IsEH ? CIEStarts[Key] : DummyDebugKey; + if (!CIEStart) + CIEStart = &Emitter.EmitCIE(Streamer, Frame.Personality, + Frame.PersonalityEncoding, Frame.Lsda, + Frame.IsSignalFrame, + Frame.LsdaEncoding); + + FDEEnd = Emitter.EmitFDE(Streamer, *CIEStart, Frame); + if (i != n - 1) - streamer.EmitLabel(fdeEnd); + Streamer.EmitLabel(FDEEnd); } - streamer.EmitValueToAlignment(asmInfo.getPointerSize()); - if (fdeEnd) - streamer.EmitLabel(fdeEnd); + Streamer.EmitValueToAlignment(Context.getAsmInfo().getPointerSize()); + if (FDEEnd) + Streamer.EmitLabel(FDEEnd); } void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer,