+
+// DWARF5 Experimental Separate Dwarf emitters.
+
+// This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
+// DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
+// DW_AT_ranges_base, DW_AT_addr_base. If DW_AT_ranges is present,
+// DW_AT_low_pc and DW_AT_high_pc are not used, and vice versa.
+CompileUnit *DwarfDebug::constructSkeletonCU(const MDNode *N) {
+ DICompileUnit DIUnit(N);
+ CompilationDir = DIUnit.getDirectory();
+
+ DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
+ CompileUnit *NewCU = new CompileUnit(GlobalCUIndexCount++,
+ DIUnit.getLanguage(), Die, Asm,
+ this, &SkeletonHolder);
+
+ SmallString<16> T(DIUnit.getFilename());
+ sys::path::replace_extension(T, ".dwo");
+ StringRef FN = sys::path::filename(T);
+ NewCU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name, FN);
+
+ // FIXME: We also need DW_AT_dwo_id.
+
+ // FIXME: The addr base should be relative for each compile unit, however,
+ // this one is going to be 0 anyhow.
+ NewCU->addUInt(Die, dwarf::DW_AT_GNU_addr_base, dwarf::DW_FORM_sec_offset, 0);
+
+ // 2.17.1 requires that we use DW_AT_low_pc for a single entry point
+ // into an entity. We're using 0, or a NULL label for this.
+ NewCU->addUInt(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 0);
+
+ // DW_AT_stmt_list is a offset of line number information for this
+ // compile unit in debug_line section.
+ if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
+ NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset,
+ Asm->GetTempSymbol("section_line"));
+ else
+ NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset, 0);
+
+ if (!CompilationDir.empty())
+ NewCU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
+
+ SkeletonHolder.addUnit(NewCU);
+
+ return NewCU;
+}
+
+void DwarfDebug::emitSkeletonCU(const MCSection *Section) {
+ Asm->OutStreamer.SwitchSection(Section);
+ DIE *Die = SkeletonCU->getCUDie();
+
+ // Emit the compile units header.
+ Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol(Section->getLabelBeginName(),
+ SkeletonCU->getUniqueID()));
+
+ // Emit size of content not including length itself
+ unsigned ContentSize = Die->getSize() +
+ sizeof(int16_t) + // DWARF version number
+ sizeof(int32_t) + // Offset Into Abbrev. Section
+ sizeof(int8_t); // Pointer Size (in bytes)
+
+ Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
+ Asm->EmitInt32(ContentSize);
+ Asm->OutStreamer.AddComment("DWARF version number");
+ Asm->EmitInt16(dwarf::DWARF_VERSION);
+ Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
+
+ const MCSection *ASec = Asm->getObjFileLowering().getDwarfAbbrevSection();
+ Asm->EmitSectionOffset(Asm->GetTempSymbol(ASec->getLabelBeginName()),
+ DwarfAbbrevSectionSym);
+ Asm->OutStreamer.AddComment("Address Size (in bytes)");
+ Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
+
+ emitDIE(Die, &SkeletonAbbrevs);
+ Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol(Section->getLabelEndName(),
+ SkeletonCU->getUniqueID()));
+}
+
+void DwarfDebug::emitSkeletonAbbrevs(const MCSection *Section) {
+ assert(useSplitDwarf() && "No split dwarf debug info?");
+ emitAbbrevs(Section, &SkeletonAbbrevs);
+}
+
+// Emit the .debug_info.dwo section for separated dwarf. This contains the
+// compile units that would normally be in debug_info.
+void DwarfDebug::emitDebugInfoDWO() {
+ assert(useSplitDwarf() && "No split dwarf debug info?");
+ InfoHolder.emitUnits(this, Asm->getObjFileLowering().getDwarfInfoDWOSection(),
+ Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
+ DwarfAbbrevDWOSectionSym);
+}
+
+// Emit the .debug_abbrev.dwo section for separated dwarf. This contains the
+// abbreviations for the .debug_info.dwo section.
+void DwarfDebug::emitDebugAbbrevDWO() {
+ assert(useSplitDwarf() && "No split dwarf?");
+ emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
+ &Abbreviations);
+}
+
+// Emit the .debug_str.dwo section for separated dwarf. This contains the
+// string section and is identical in format to traditional .debug_str
+// sections.
+void DwarfDebug::emitDebugStrDWO() {
+ assert(useSplitDwarf() && "No split dwarf?");
+ const MCSection *OffSec = Asm->getObjFileLowering()
+ .getDwarfStrOffDWOSection();
+ const MCSymbol *StrSym = DwarfStrSectionSym;
+ InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),
+ OffSec, StrSym);
+}