#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCRegisterInfo.h"
-#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
// and if there is information from the last .loc directive that has yet to have
// a line entry made for it is made.
//
-void MCLineEntry::Make(MCStreamer *MCOS, const MCSection *Section) {
+void MCLineEntry::Make(MCObjectStreamer *MCOS, const MCSection *Section) {
if (!MCOS->getContext().getDwarfLocSeen())
return;
// in the LineSection.
//
static inline void
-EmitDwarfLineTable(MCStreamer *MCOS, const MCSection *Section,
+EmitDwarfLineTable(MCObjectStreamer *MCOS, const MCSection *Section,
const MCLineSection::MCLineEntryCollection &LineEntries) {
unsigned FileNum = 1;
unsigned LastLine = 1;
unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
unsigned Isa = 0;
unsigned Discriminator = 0;
- MCSymbol *LastLabel = NULL;
+ MCSymbol *LastLabel = nullptr;
// Loop through each MCLineEntry and encode the dwarf line number table.
for (auto it = LineEntries.begin(),
//
// This emits the Dwarf file and the line tables.
//
-void MCDwarfLineTable::Emit(MCStreamer *MCOS) {
+void MCDwarfLineTable::Emit(MCObjectStreamer *MCOS) {
MCContext &context = MCOS->getContext();
auto &LineTables = context.getMCDwarfLineTables();
return Emit(MCOS, StandardOpcodeLengths);
}
+static const MCExpr *forceExpAbs(MCStreamer &OS, const MCExpr* Expr) {
+ MCContext &Context = OS.getContext();
+ assert(!isa<MCSymbolRefExpr>(Expr));
+ if (Context.getAsmInfo()->hasAggressiveSymbolFolding())
+ return Expr;
+
+ MCSymbol *ABS = Context.CreateTempSymbol();
+ OS.EmitAssignment(ABS, Expr);
+ return MCSymbolRefExpr::Create(ABS, Context);
+}
+
+static void emitAbsValue(MCStreamer &OS, const MCExpr *Value, unsigned Size) {
+ const MCExpr *ABS = forceExpAbs(OS, Value);
+ OS.EmitValue(ABS, Size);
+}
+
std::pair<MCSymbol *, MCSymbol *>
MCDwarfLineTableHeader::Emit(MCStreamer *MCOS,
ArrayRef<char> StandardOpcodeLengths) const {
// The first 4 bytes is the total length of the information for this
// compilation unit (not including these 4 bytes for the length).
- MCOS->EmitAbsValue(MakeStartMinusEndExpr(*MCOS, *LineStartSym, *LineEndSym,4),
- 4);
+ emitAbsValue(*MCOS,
+ MakeStartMinusEndExpr(*MCOS, *LineStartSym, *LineEndSym, 4), 4);
// Next 2 bytes is the Version, which is Dwarf 2.
MCOS->EmitIntValue(2, 2);
// section to the end of the prologue. Not including the 4 bytes for the
// total length, the 2 bytes for the version, and these 4 bytes for the
// length of the prologue.
- MCOS->EmitAbsValue(MakeStartMinusEndExpr(*MCOS, *LineStartSym, *ProEndSym,
- (4 + 2 + 4)), 4);
+ emitAbsValue(
+ *MCOS,
+ MakeStartMinusEndExpr(*MCOS, *LineStartSym, *ProEndSym, (4 + 2 + 4)), 4);
// Parameters of the state machine, are next.
MCOS->EmitIntValue(context.getAsmInfo()->getMinInstAlignment(), 1);
return std::make_pair(LineStartSym, LineEndSym);
}
-void MCDwarfLineTable::EmitCU(MCStreamer *MCOS) const {
+void MCDwarfLineTable::EmitCU(MCObjectStreamer *MCOS) const {
MCSymbol *LineEndSym = Header.Emit(MCOS).second;
// Put out the line tables.
for (const auto &LineSec : MCLineSections.getMCLineEntries())
EmitDwarfLineTable(MCOS, LineSec.first, LineSec.second);
- if (MCOS->getContext().getAsmInfo()->getLinkerRequiresNonEmptyDwarfLines() &&
- MCLineSections.getMCLineEntries().empty()) {
- // The darwin9 linker has a bug (see PR8715). For for 32-bit architectures
- // it requires:
- // total_length >= prologue_length + 10
- // We are 4 bytes short, since we have total_length = 51 and
- // prologue_length = 45
-
- // The regular end_sequence should be sufficient.
- MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0);
- }
-
// 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);
FileNumber = SourceIdMap.size() + 1;
assert((MCDwarfFiles.empty() || FileNumber == MCDwarfFiles.size()) &&
"Don't mix autonumbered and explicit numbered line table usage");
- StringMapEntry<unsigned> &Ent = SourceIdMap.GetOrCreateValue(
- (Directory + Twine('\0') + FileName).str(), FileNumber);
- if (Ent.getValue() != FileNumber)
- return Ent.getValue();
+ auto IterBool = SourceIdMap.insert(
+ std::make_pair((Directory + Twine('\0') + FileName).str(), FileNumber));
+ if (!IterBool.second)
+ return IterBool.first->second;
}
// Make space for this FileNumber in the MCDwarfFiles vector if needed.
MCDwarfFiles.resize(FileNumber + 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);
+ if (MCOS->getContext().getGenDwarfSectionSyms().size() > 1 &&
+ MCOS->getContext().getDwarfVersion() >= 3) {
+ EmitAbbrev(MCOS, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4);
+ } else {
+ 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);
if (!context.getCompilationDir().empty())
EmitAbbrev(MCOS, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string);
}
// 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.
+// .debug_aranges section. This section contains a header and a table of pairs
+// of PointerSize'ed values for the address and size of section(s) with line
+// table entries.
static void EmitGenDwarfAranges(MCStreamer *MCOS,
const MCSymbol *InfoSectionSymbol) {
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);
+ auto &Sections = context.getGenDwarfSectionSyms();
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfARangesSection());
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;
+ // of each section we have in the table.
+ Length += 2 * AddrSize * Sections.size();
// And the pair of terminating zeros.
Length += 2 * AddrSize;
// The 4 byte offset to the compile unit in the .debug_info from the start
// of the .debug_info.
if (InfoSectionSymbol)
- MCOS->EmitSymbolValue(InfoSectionSymbol, 4);
+ MCOS->EmitSymbolValue(InfoSectionSymbol, 4,
+ asmInfo->needsDwarfSectionOffsetDirective());
else
MCOS->EmitIntValue(0, 4);
// The 1 byte size of an address.
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->EmitValue(Addr, AddrSize);
- MCOS->EmitAbsValue(Size, AddrSize);
+ // Now emit the table of pairs of PointerSize'ed values for the section
+ // addresses and sizes.
+ for (const auto &sec : Sections) {
+ MCSymbol *StartSymbol = sec.second.first;
+ MCSymbol *EndSymbol = sec.second.second;
+ assert(StartSymbol && "StartSymbol must not be NULL");
+ assert(EndSymbol && "EndSymbol must not be NULL");
+
+ const MCExpr *Addr = MCSymbolRefExpr::Create(
+ StartSymbol, MCSymbolRefExpr::VK_None, context);
+ const MCExpr *Size = MakeStartMinusEndExpr(*MCOS,
+ *StartSymbol, *EndSymbol, 0);
+ MCOS->EmitValue(Addr, AddrSize);
+ emitAbsValue(*MCOS, Size, AddrSize);
+ }
// And finally the pair of terminating zeros.
MCOS->EmitIntValue(0, AddrSize);
// DIE and a list of label DIEs.
static void EmitGenDwarfInfo(MCStreamer *MCOS,
const MCSymbol *AbbrevSectionSymbol,
- const MCSymbol *LineSectionSymbol) {
+ const MCSymbol *LineSectionSymbol,
+ const MCSymbol *RangesSectionSymbol) {
MCContext &context = MCOS->getContext();
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfInfoSection());
// 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);
+ emitAbsValue(*MCOS, Length, 4);
- // The 2 byte DWARF version, which is 2.
- MCOS->EmitIntValue(2, 2);
+ // The 2 byte DWARF version.
+ MCOS->EmitIntValue(context.getDwarfVersion(), 2);
+ const MCAsmInfo &AsmInfo = *context.getAsmInfo();
// 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 {
+ if (AbbrevSectionSymbol == nullptr)
MCOS->EmitIntValue(0, 4);
- }
+ else
+ MCOS->EmitSymbolValue(AbbrevSectionSymbol, 4,
+ AsmInfo.needsDwarfSectionOffsetDirective());
const MCAsmInfo *asmInfo = context.getAsmInfo();
int AddrSize = asmInfo->getPointerSize();
// 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 {
+ if (LineSectionSymbol)
+ MCOS->EmitSymbolValue(LineSectionSymbol, 4,
+ AsmInfo.needsDwarfSectionOffsetDirective());
+ 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->EmitValue(Start, AddrSize);
+ if (RangesSectionSymbol) {
+ // There are multiple sections containing code, so we must use the
+ // .debug_ranges sections.
- // AT_high_pc, the last address of the default .text section.
- const MCExpr *End = MCSymbolRefExpr::Create(
- context.getGenDwarfSectionEndSym(), MCSymbolRefExpr::VK_None, context);
- MCOS->EmitValue(End, AddrSize);
+ // AT_ranges, the 4 byte offset from the start of the .debug_ranges section
+ // to the address range list for this compilation unit.
+ MCOS->EmitSymbolValue(RangesSectionSymbol, 4);
+ } else {
+ // If we only have one non-empty code section, we can use the simpler
+ // AT_low_pc and AT_high_pc attributes.
+
+ // Find the first (and only) non-empty text section
+ auto &Sections = context.getGenDwarfSectionSyms();
+ const auto TextSection = Sections.begin();
+ assert(TextSection != Sections.end() && "No text section found");
+
+ MCSymbol *StartSymbol = TextSection->second.first;
+ MCSymbol *EndSymbol = TextSection->second.second;
+ assert(StartSymbol && "StartSymbol must not be NULL");
+ assert(EndSymbol && "EndSymbol must not be NULL");
+
+ // AT_low_pc, the first address of the default .text section.
+ const MCExpr *Start = MCSymbolRefExpr::Create(
+ StartSymbol, MCSymbolRefExpr::VK_None, context);
+ MCOS->EmitValue(Start, AddrSize);
+
+ // AT_high_pc, the last address of the default .text section.
+ const MCExpr *End = MCSymbolRefExpr::Create(
+ EndSymbol, MCSymbolRefExpr::VK_None, context);
+ MCOS->EmitValue(End, AddrSize);
+ }
// AT_name, the name of the source file. Reconstruct from the first directory
// and file table entries.
const SmallVectorImpl<std::string> &MCDwarfDirs = context.getMCDwarfDirs();
if (MCDwarfDirs.size() > 0) {
MCOS->EmitBytes(MCDwarfDirs[0]);
- MCOS->EmitBytes("/");
+ MCOS->EmitBytes(sys::path::get_separator());
}
const SmallVectorImpl<MCDwarfFile> &MCDwarfFiles =
MCOS->getContext().getMCDwarfFiles();
// AT_producer, the version of the assembler tool.
StringRef DwarfDebugProducer = context.getDwarfDebugProducer();
- if (!DwarfDebugProducer.empty()){
+ if (!DwarfDebugProducer.empty())
MCOS->EmitBytes(DwarfDebugProducer);
- }
- else {
- MCOS->EmitBytes(StringRef("llvm-mc (based on LLVM "));
- MCOS->EmitBytes(StringRef(PACKAGE_VERSION));
- MCOS->EmitBytes(StringRef(")"));
- }
+ else
+ MCOS->EmitBytes(StringRef("llvm-mc (based on LLVM " PACKAGE_VERSION ")"));
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
MCOS->EmitLabel(InfoEnd);
}
+// When generating dwarf for assembly source files this emits the data for
+// .debug_ranges section. We only emit one range list, which spans all of the
+// executable sections of this file.
+static void EmitGenDwarfRanges(MCStreamer *MCOS) {
+ MCContext &context = MCOS->getContext();
+ auto &Sections = context.getGenDwarfSectionSyms();
+
+ const MCAsmInfo *AsmInfo = context.getAsmInfo();
+ int AddrSize = AsmInfo->getPointerSize();
+
+ MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfRangesSection());
+
+ for (const auto sec : Sections) {
+
+ MCSymbol *StartSymbol = sec.second.first;
+ MCSymbol *EndSymbol = sec.second.second;
+ assert(StartSymbol && "StartSymbol must not be NULL");
+ assert(EndSymbol && "EndSymbol must not be NULL");
+
+ // Emit a base address selection entry for the start of this section
+ const MCExpr *SectionStartAddr = MCSymbolRefExpr::Create(
+ StartSymbol, MCSymbolRefExpr::VK_None, context);
+ MCOS->EmitFill(AddrSize, 0xFF);
+ MCOS->EmitValue(SectionStartAddr, AddrSize);
+
+ // Emit a range list entry spanning this section
+ const MCExpr *SectionSize = MakeStartMinusEndExpr(*MCOS,
+ *StartSymbol, *EndSymbol, 0);
+ MCOS->EmitIntValue(0, AddrSize);
+ emitAbsValue(*MCOS, SectionSize, AddrSize);
+ }
+
+ // Emit end of list entry
+ MCOS->EmitIntValue(0, AddrSize);
+ MCOS->EmitIntValue(0, AddrSize);
+}
+
//
// When generating dwarf for assembly source files this emits the Dwarf
// sections.
//
void MCGenDwarfInfo::Emit(MCStreamer *MCOS) {
- // Create the dwarf sections in this order (.debug_line already created).
MCContext &context = MCOS->getContext();
+
+ // Create the dwarf sections in this order (.debug_line already created).
const MCAsmInfo *AsmInfo = context.getAsmInfo();
bool CreateDwarfSectionSymbols =
AsmInfo->doesDwarfUseRelocationsAcrossSections();
MCSymbol *LineSectionSymbol = nullptr;
if (CreateDwarfSectionSymbols)
LineSectionSymbol = MCOS->getDwarfLineTableSymbol(0);
- MCSymbol *AbbrevSectionSymbol = NULL;
- MCSymbol *InfoSectionSymbol = NULL;
+ MCSymbol *AbbrevSectionSymbol = nullptr;
+ MCSymbol *InfoSectionSymbol = nullptr;
+ MCSymbol *RangesSectionSymbol = NULL;
+
+ // Create end symbols for each section, and remove empty sections
+ MCOS->getContext().finalizeDwarfSections(*MCOS);
+
+ // If there are no sections to generate debug info for, we don't need
+ // to do anything
+ if (MCOS->getContext().getGenDwarfSectionSyms().empty())
+ return;
+
+ // We only use the .debug_ranges section if we have multiple code sections,
+ // and we are emitting a DWARF version which supports it.
+ const bool UseRangesSection =
+ MCOS->getContext().getGenDwarfSectionSyms().size() > 1 &&
+ MCOS->getContext().getDwarfVersion() >= 3;
+ CreateDwarfSectionSymbols |= UseRangesSection;
+
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfInfoSection());
if (CreateDwarfSectionSymbols) {
InfoSectionSymbol = context.CreateTempSymbol();
AbbrevSectionSymbol = context.CreateTempSymbol();
MCOS->EmitLabel(AbbrevSectionSymbol);
}
- MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfARangesSection());
+ if (UseRangesSection) {
+ MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfRangesSection());
+ if (CreateDwarfSectionSymbols) {
+ RangesSectionSymbol = context.CreateTempSymbol();
+ MCOS->EmitLabel(RangesSectionSymbol);
+ }
+ }
- // If there are no line table entries then do not emit any section contents.
- if (!context.hasMCLineSections())
- return;
+ assert((RangesSectionSymbol != NULL) || !UseRangesSection);
+
+ MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfARangesSection());
// Output the data for .debug_aranges section.
EmitGenDwarfAranges(MCOS, InfoSectionSymbol);
+ if (UseRangesSection)
+ EmitGenDwarfRanges(MCOS);
+
// Output the data for .debug_abbrev section.
EmitGenDwarfAbbrev(MCOS);
// Output the data for .debug_info section.
- EmitGenDwarfInfo(MCOS, AbbrevSectionSymbol, LineSectionSymbol);
+ EmitGenDwarfInfo(MCOS, AbbrevSectionSymbol, LineSectionSymbol,
+ RangesSectionSymbol);
}
//
//
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.
+ // We won't create dwarf labels for temporary symbols.
if (Symbol->isTemporary())
return;
MCContext &context = MCOS->getContext();
- if (context.getGenDwarfSection() != MCOS->getCurrentSection().first)
+ // We won't create dwarf labels for symbols in sections that we are not
+ // generating debug info for.
+ if (!context.getGenDwarfSectionSyms().count(MCOS->getCurrentSection().first))
return;
// The dwarf label's name does not have the symbol name's leading
// 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 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
}
}
-static void EmitFDESymbol(MCStreamer &streamer, const MCSymbol &symbol,
- unsigned symbolEncoding, bool isEH,
- const char *comment = 0) {
+static void emitFDESymbol(MCObjectStreamer &streamer, const MCSymbol &symbol,
+ unsigned symbolEncoding, bool isEH) {
MCContext &context = streamer.getContext();
const MCAsmInfo *asmInfo = context.getAsmInfo();
const MCExpr *v = asmInfo->getExprForFDESymbol(&symbol,
symbolEncoding,
streamer);
unsigned size = getSizeForEncoding(streamer, symbolEncoding);
- if (streamer.isVerboseAsm() && comment) streamer.AddComment(comment);
if (asmInfo->doDwarfFDESymbolsUseAbsDiff() && isEH)
- streamer.EmitAbsValue(v, size);
+ emitAbsValue(streamer, v, size);
else
streamer.EmitValue(v, size);
}
namespace {
class FrameEmitterImpl {
int CFAOffset;
- int CIENum;
- bool UsingCFI;
bool IsEH;
const MCSymbol *SectionStart;
public:
- FrameEmitterImpl(bool usingCFI, bool isEH)
- : CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
- SectionStart(0) {}
+ FrameEmitterImpl(bool isEH)
+ : CFAOffset(0), IsEH(isEH), SectionStart(nullptr) {}
void setSectionStart(const MCSymbol *Label) { SectionStart = Label; }
- /// EmitCompactUnwind - Emit the unwind information in a compact way.
- void EmitCompactUnwind(MCStreamer &streamer,
+ /// Emit the unwind information in a compact way.
+ void EmitCompactUnwind(MCObjectStreamer &streamer,
const MCDwarfFrameInfo &frame);
- const MCSymbol &EmitCIE(MCStreamer &streamer,
+ const MCSymbol &EmitCIE(MCObjectStreamer &streamer,
const MCSymbol *personality,
unsigned personalityEncoding,
const MCSymbol *lsda,
bool IsSignalFrame,
unsigned lsdaEncoding,
bool IsSimple);
- MCSymbol *EmitFDE(MCStreamer &streamer,
+ MCSymbol *EmitFDE(MCObjectStreamer &streamer,
const MCSymbol &cieStart,
const MCDwarfFrameInfo &frame);
- void EmitCFIInstructions(MCStreamer &streamer,
+ void EmitCFIInstructions(MCObjectStreamer &streamer,
ArrayRef<MCCFIInstruction> Instrs,
MCSymbol *BaseLabel);
- void EmitCFIInstruction(MCStreamer &Streamer,
+ void EmitCFIInstruction(MCObjectStreamer &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 = "<unknown encoding>"; 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);
- }
-
+static void emitEncodingByte(MCObjectStreamer &Streamer, unsigned Encoding) {
Streamer.EmitIntValue(Encoding, 1);
}
-void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
+void FrameEmitterImpl::EmitCFIInstruction(MCObjectStreamer &Streamer,
const MCCFIInstruction &Instr) {
int dataAlignmentFactor = getDataAlignmentFactor(Streamer);
- bool VerboseAsm = Streamer.isVerboseAsm();
+ auto *MRI = Streamer.getContext().getRegisterInfo();
switch (Instr.getOperation()) {
case MCCFIInstruction::OpRegister: {
unsigned Reg1 = Instr.getRegister();
unsigned Reg2 = Instr.getRegister2();
- if (VerboseAsm) {
- Streamer.AddComment("DW_CFA_register");
- Streamer.AddComment(Twine("Reg1 ") + Twine(Reg1));
- Streamer.AddComment(Twine("Reg2 ") + Twine(Reg2));
+ if (!IsEH) {
+ Reg1 = MRI->getDwarfRegNum(MRI->getLLVMRegNum(Reg1, true), false);
+ Reg2 = MRI->getDwarfRegNum(MRI->getLLVMRegNum(Reg2, true), false);
}
Streamer.EmitIntValue(dwarf::DW_CFA_register, 1);
Streamer.EmitULEB128IntValue(Reg1);
}
case MCCFIInstruction::OpUndefined: {
unsigned Reg = Instr.getRegister();
- if (VerboseAsm) {
- Streamer.AddComment("DW_CFA_undefined");
- Streamer.AddComment(Twine("Reg ") + Twine(Reg));
- }
Streamer.EmitIntValue(dwarf::DW_CFA_undefined, 1);
Streamer.EmitULEB128IntValue(Reg);
return;
const bool IsRelative =
Instr.getOperation() == MCCFIInstruction::OpAdjustCfaOffset;
- if (VerboseAsm)
- Streamer.AddComment("DW_CFA_def_cfa_offset");
Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1);
if (IsRelative)
else
CFAOffset = -Instr.getOffset();
- if (VerboseAsm)
- Streamer.AddComment(Twine("Offset " + Twine(CFAOffset)));
Streamer.EmitULEB128IntValue(CFAOffset);
return;
}
case MCCFIInstruction::OpDefCfa: {
- if (VerboseAsm)
- Streamer.AddComment("DW_CFA_def_cfa");
+ unsigned Reg = Instr.getRegister();
+ if (!IsEH)
+ Reg = MRI->getDwarfRegNum(MRI->getLLVMRegNum(Reg, true), false);
Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1);
-
- if (VerboseAsm)
- Streamer.AddComment(Twine("Reg ") + Twine(Instr.getRegister()));
- Streamer.EmitULEB128IntValue(Instr.getRegister());
-
+ Streamer.EmitULEB128IntValue(Reg);
CFAOffset = -Instr.getOffset();
-
- if (VerboseAsm)
- Streamer.AddComment(Twine("Offset " + Twine(CFAOffset)));
Streamer.EmitULEB128IntValue(CFAOffset);
return;
}
case MCCFIInstruction::OpDefCfaRegister: {
- if (VerboseAsm)
- Streamer.AddComment("DW_CFA_def_cfa_register");
+ unsigned Reg = Instr.getRegister();
+ if (!IsEH)
+ Reg = MRI->getDwarfRegNum(MRI->getLLVMRegNum(Reg, true), false);
Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1);
-
- if (VerboseAsm)
- Streamer.AddComment(Twine("Reg ") + Twine(Instr.getRegister()));
- Streamer.EmitULEB128IntValue(Instr.getRegister());
+ Streamer.EmitULEB128IntValue(Reg);
return;
}
Instr.getOperation() == MCCFIInstruction::OpRelOffset;
unsigned Reg = Instr.getRegister();
+ if (!IsEH)
+ Reg = MRI->getDwarfRegNum(MRI->getLLVMRegNum(Reg, true), false);
+
int Offset = Instr.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::OpRememberState:
- if (VerboseAsm) Streamer.AddComment("DW_CFA_remember_state");
Streamer.EmitIntValue(dwarf::DW_CFA_remember_state, 1);
return;
case MCCFIInstruction::OpRestoreState:
- if (VerboseAsm) Streamer.AddComment("DW_CFA_restore_state");
Streamer.EmitIntValue(dwarf::DW_CFA_restore_state, 1);
return;
case MCCFIInstruction::OpSameValue: {
unsigned Reg = Instr.getRegister();
- 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::OpRestore: {
unsigned Reg = Instr.getRegister();
- if (VerboseAsm) {
- Streamer.AddComment("DW_CFA_restore");
- Streamer.AddComment(Twine("Reg ") + Twine(Reg));
- }
+ if (!IsEH)
+ Reg = MRI->getDwarfRegNum(MRI->getLLVMRegNum(Reg, true), false);
Streamer.EmitIntValue(dwarf::DW_CFA_restore | Reg, 1);
return;
}
case MCCFIInstruction::OpEscape:
- if (VerboseAsm) Streamer.AddComment("Escape bytes");
Streamer.EmitBytes(Instr.getValues());
return;
}
llvm_unreachable("Unhandled case in switch");
}
-/// EmitFrameMoves - Emit frame instructions to describe the layout of the
-/// frame.
-void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer,
+/// Emit frame instructions to describe the layout of the frame.
+void FrameEmitterImpl::EmitCFIInstructions(MCObjectStreamer &streamer,
ArrayRef<MCCFIInstruction> Instrs,
MCSymbol *BaseLabel) {
for (unsigned i = 0, N = Instrs.size(); i < N; ++i) {
if (BaseLabel && Label) {
MCSymbol *ThisSym = Label;
if (ThisSym != BaseLabel) {
- if (streamer.isVerboseAsm()) streamer.AddComment("DW_CFA_advance_loc4");
streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym);
BaseLabel = ThisSym;
}
}
}
-/// EmitCompactUnwind - Emit the unwind information in a compact way.
-void FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
+/// Emit the unwind information in a compact way.
+void FrameEmitterImpl::EmitCompactUnwind(MCObjectStreamer &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
Encoding |= 0x40000000;
// Range Start
- unsigned FDEEncoding = MOFI->getFDEEncoding(UsingCFI);
+ unsigned FDEEncoding = MOFI->getFDEEncoding();
unsigned Size = getSizeForEncoding(Streamer, FDEEncoding);
- if (VerboseAsm) Streamer.AddComment("Range Start");
- Streamer.EmitSymbolValue(Frame.Function, Size);
+ Streamer.EmitSymbolValue(Frame.Begin, Size);
// Range Length
const MCExpr *Range = MakeStartMinusEndExpr(Streamer, *Frame.Begin,
*Frame.End, 0);
- if (VerboseAsm) Streamer.AddComment("Range Length");
- Streamer.EmitAbsValue(Range, 4);
+ emitAbsValue(Streamer, 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 (!DwarfEHFrameOnly && Frame.Personality)
Streamer.EmitSymbolValue(Frame.Personality, Size);
else
// LSDA
Size = getSizeForEncoding(Streamer, Frame.LsdaEncoding);
- if (VerboseAsm) Streamer.AddComment("LSDA");
if (!DwarfEHFrameOnly && Frame.Lsda)
Streamer.EmitSymbolValue(Frame.Lsda, Size);
else
Streamer.EmitIntValue(0, Size); // No LSDA
}
-const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
+const MCSymbol &FrameEmitterImpl::EmitCIE(MCObjectStreamer &streamer,
const MCSymbol *personality,
unsigned personalityEncoding,
const MCSymbol *lsda,
MCContext &context = streamer.getContext();
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));
+ MCSymbol *sectionStart = context.CreateTempSymbol();
streamer.EmitLabel(sectionStart);
- CIENum++;
MCSymbol *sectionEnd = context.CreateTempSymbol();
// Length
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart,
*sectionEnd, 4);
- if (verboseAsm) streamer.AddComment("CIE Length");
- streamer.EmitAbsValue(Length, 4);
+ emitAbsValue(streamer, Length, 4);
// CIE ID
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);
+ // For DWARF2, we use CIE version 1
+ // For DWARF3+, we use CIE version 3
+ uint8_t CIEVersion = context.getDwarfVersion() <= 2 ? 1 : 3;
+ streamer.EmitIntValue(CIEVersion, 1);
// Augmentation String
SmallString<8> Augmentation;
if (IsEH) {
- if (verboseAsm) streamer.AddComment("CIE Augmentation");
Augmentation += "z";
if (personality)
Augmentation += "P";
streamer.EmitIntValue(0, 1);
// Code Alignment Factor
- if (verboseAsm) streamer.AddComment("CIE Code Alignment Factor");
streamer.EmitULEB128IntValue(context.getAsmInfo()->getMinInstAlignment());
// Data Alignment Factor
- if (verboseAsm) streamer.AddComment("CIE Data Alignment Factor");
streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer));
// Return Address Register
- if (verboseAsm) streamer.AddComment("CIE Return Address Column");
- streamer.EmitULEB128IntValue(MRI->getDwarfRegNum(MRI->getRARegister(), true));
+ if (CIEVersion == 1) {
+ assert(MRI->getRARegister() <= 255 &&
+ "DWARF 2 encodes return_address_register in one byte");
+ streamer.EmitIntValue(MRI->getDwarfRegNum(MRI->getRARegister(), IsEH), 1);
+ } else {
+ streamer.EmitULEB128IntValue(
+ MRI->getDwarfRegNum(MRI->getRARegister(), IsEH));
+ }
// Augmentation Data Length (optional)
// 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");
+ emitEncodingByte(streamer, personalityEncoding);
// Personality
- if (verboseAsm) streamer.AddComment("Personality");
EmitPersonality(streamer, *personality, personalityEncoding);
}
if (lsda)
- EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding");
+ emitEncodingByte(streamer, lsdaEncoding);
// Encoding of the FDE pointers
- EmitEncodingByte(streamer, MOFI->getFDEEncoding(UsingCFI),
- "FDE Encoding");
+ emitEncodingByte(streamer, MOFI->getFDEEncoding());
}
// Initial Instructions
if (!IsSimple) {
const std::vector<MCCFIInstruction> &Instructions =
MAI->getInitialFrameState();
- EmitCFIInstructions(streamer, Instructions, NULL);
+ EmitCFIInstructions(streamer, Instructions, nullptr);
}
// Padding
return *sectionStart;
}
-MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
+MCSymbol *FrameEmitterImpl::EmitFDE(MCObjectStreamer &streamer,
const MCSymbol &cieStart,
const MCDwarfFrameInfo &frame) {
MCContext &context = streamer.getContext();
MCSymbol *fdeStart = context.CreateTempSymbol();
MCSymbol *fdeEnd = context.CreateTempSymbol();
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);
+ emitAbsValue(streamer, Length, 4);
streamer.EmitLabel(fdeStart);
if (IsEH) {
const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
0);
- if (verboseAsm) streamer.AddComment("FDE CIE Offset");
- streamer.EmitAbsValue(offset, 4);
+ emitAbsValue(streamer, offset, 4);
} else if (!asmInfo->doesDwarfUseRelocationsAcrossSections()) {
const MCExpr *offset = MakeStartMinusEndExpr(streamer, *SectionStart,
cieStart, 0);
- streamer.EmitAbsValue(offset, 4);
+ emitAbsValue(streamer, offset, 4);
} else {
streamer.EmitSymbolValue(&cieStart, 4);
}
// PC Begin
- unsigned PCEncoding = IsEH ? MOFI->getFDEEncoding(UsingCFI)
- : (unsigned)dwarf::DW_EH_PE_absptr;
+ unsigned PCEncoding =
+ IsEH ? MOFI->getFDEEncoding() : (unsigned)dwarf::DW_EH_PE_absptr;
unsigned PCSize = getSizeForEncoding(streamer, PCEncoding);
- EmitFDESymbol(streamer, *frame.Begin, PCEncoding, IsEH, "FDE initial location");
+ emitFDESymbol(streamer, *frame.Begin, PCEncoding, IsEH);
// PC Range
const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin,
*frame.End, 0);
- if (verboseAsm) streamer.AddComment("FDE address range");
- streamer.EmitAbsValue(Range, PCSize);
+ emitAbsValue(streamer, Range, PCSize);
if (IsEH) {
// Augmentation Data Length
if (frame.Lsda)
augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding);
- if (verboseAsm) streamer.AddComment("Augmentation size");
streamer.EmitULEB128IntValue(augmentationLength);
// Augmentation Data
if (frame.Lsda)
- EmitFDESymbol(streamer, *frame.Lsda, frame.LsdaEncoding, true,
- "Language Specific Data Area");
+ emitFDESymbol(streamer, *frame.Lsda, frame.LsdaEncoding, true);
}
// Call Frame Instructions
namespace {
struct CIEKey {
- static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1, false, false); }
- static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0, false, false); }
-
- CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_,
- unsigned LsdaEncoding_, bool IsSignalFrame_, bool IsSimple_) :
- Personality(Personality_), PersonalityEncoding(PersonalityEncoding_),
- LsdaEncoding(LsdaEncoding_), IsSignalFrame(IsSignalFrame_),
- IsSimple(IsSimple_) {
+ static const CIEKey getEmptyKey() {
+ return CIEKey(nullptr, 0, -1, false, false);
}
- const MCSymbol* Personality;
+ static const CIEKey getTombstoneKey() {
+ return CIEKey(nullptr, -1, 0, false, false);
+ }
+
+ CIEKey(const MCSymbol *Personality_, unsigned PersonalityEncoding_,
+ unsigned LsdaEncoding_, bool IsSignalFrame_, bool IsSimple_)
+ : Personality(Personality_), PersonalityEncoding(PersonalityEncoding_),
+ LsdaEncoding(LsdaEncoding_), IsSignalFrame(IsSignalFrame_),
+ IsSimple(IsSimple_) {}
+ const MCSymbol *Personality;
unsigned PersonalityEncoding;
unsigned LsdaEncoding;
bool IsSignalFrame;
};
}
-void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer, MCAsmBackend *MAB,
- bool UsingCFI, bool IsEH) {
+void MCDwarfFrameEmitter::Emit(MCObjectStreamer &Streamer, MCAsmBackend *MAB,
+ bool IsEH) {
Streamer.generateCompactUnwindEncodings(MAB);
MCContext &Context = Streamer.getContext();
const MCObjectFileInfo *MOFI = Context.getObjectFileInfo();
- FrameEmitterImpl Emitter(UsingCFI, IsEH);
- ArrayRef<MCDwarfFrameInfo> FrameArray = Streamer.getFrameInfos();
+ FrameEmitterImpl Emitter(IsEH);
+ ArrayRef<MCDwarfFrameInfo> FrameArray = Streamer.getDwarfFrameInfos();
// Emit the compact unwind info if available.
bool NeedsEHFrameSection = !MOFI->getSupportsCompactUnwindWithoutEHFrame();
Streamer.EmitLabel(SectionStart);
Emitter.setSectionStart(SectionStart);
- MCSymbol *FDEEnd = NULL;
- DenseMap<CIEKey, const MCSymbol*> CIEStarts;
+ MCSymbol *FDEEnd = nullptr;
+ DenseMap<CIEKey, const MCSymbol *> CIEStarts;
- const MCSymbol *DummyDebugKey = NULL;
+ const MCSymbol *DummyDebugKey = nullptr;
NeedsEHFrameSection = !MOFI->getSupportsCompactUnwindWithoutEHFrame();
for (unsigned i = 0, n = FrameArray.size(); i < n; ++i) {
const MCDwarfFrameInfo &Frame = FrameArray[i];
// Emit the label from the previous iteration
if (FDEEnd) {
Streamer.EmitLabel(FDEEnd);
- FDEEnd = NULL;
+ FDEEnd = nullptr;
}
if (!NeedsEHFrameSection && Frame.CompactUnwindEncoding !=
Streamer.EmitLabel(FDEEnd);
}
-void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer,
+void MCDwarfFrameEmitter::EmitAdvanceLoc(MCObjectStreamer &Streamer,
uint64_t AddrDelta) {
MCContext &Context = Streamer.getContext();
SmallString<256> Tmp;
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