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It may not be an option to skip .debug_line if there are file reference in already emitted debug info. So, for now, emit dummy line table entry to make older linker and assemblers happy. This is not a new behavior, original AsmPrinter emitted similar line table entries.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120760 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -180,9 +180,6 @@ namespace llvm {
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bool hasDwarfFiles() const {
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return !MCDwarfFiles.empty();
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}
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bool hasDwarfLines() const {
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return !MCLineSectionOrder.empty();
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}
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const std::vector<MCDwarfFile *> &getMCDwarfFiles() {
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return MCDwarfFiles;
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@ -209,7 +209,8 @@ namespace llvm {
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// This emits the Dwarf file and the line tables.
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//
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static void Emit(MCStreamer *MCOS, const MCSection *DwarfLineSection,
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MCSectionData *DLS, int PointerSize);
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MCSectionData *DLS, int PointerSize,
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const MCSection *TextSection = NULL);
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};
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class MCDwarfLineAddr {
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@ -885,9 +885,9 @@ void MCAsmStreamer::EmitRawText(StringRef String) {
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void MCAsmStreamer::Finish() {
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// Dump out the dwarf file & directory tables and line tables.
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if (getContext().hasDwarfFiles() && getContext().hasDwarfLines() && TLOF) {
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if (getContext().hasDwarfFiles() && TLOF) {
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MCDwarfFileTable::Emit(this, TLOF->getDwarfLineSection(), NULL,
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PointerSize);
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PointerSize, TLOF->getTextSection());
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}
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}
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@ -241,7 +241,8 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS,
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void MCDwarfFileTable::Emit(MCStreamer *MCOS,
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const MCSection *DwarfLineSection,
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MCSectionData *DLS,
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int PointerSize) {
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int PointerSize,
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const MCSection *TextSection) {
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// Switch to the section where the table will be emitted into.
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MCOS->SwitchSection(DwarfLineSection);
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@ -339,6 +340,23 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS,
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delete Line;
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}
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if (TextSection && MCLineSectionOrder.begin() == MCLineSectionOrder.end()) {
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// Emit dummy entry if line table is empty.
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MCOS->SwitchSection(TextSection);
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MCSymbol *SectionEnd = MCOS->getContext().CreateTempSymbol();
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// Set the value of the symbol, as we are at the end of the section.
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MCOS->EmitLabel(SectionEnd);
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// Switch back the the dwarf line section.
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MCOS->SwitchSection(DwarfLineSection);
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// emit the sequence to set the address
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EmitDwarfSetAddress(MCOS, SectionEnd, PointerSize);
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// emit the sequence for the LineDelta (from 1) and a zero address delta.
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MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0);
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}
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// This is the end of the section, so set the value of the symbol at the end
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// of this section (that was used in a previous expression).
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MCOS->EmitLabel(LineEndSym);
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