+
+// 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, N, Asm,
+ this, &SkeletonHolder);
+
+ NewCU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
+ DIUnit.getSplitDebugFilename());
+
+ // This should be a unique identifier when we want to build .dwp files.
+ NewCU->addUInt(Die, dwarf::DW_AT_GNU_dwo_id, dwarf::DW_FORM_data8, 0);
+
+ // Relocate to the beginning of the addr_base section, else 0 for the
+ // beginning of the one for this compile unit.
+ if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
+ NewCU->addLabel(Die, dwarf::DW_AT_GNU_addr_base, dwarf::DW_FORM_sec_offset,
+ DwarfAddrSectionSym);
+ else
+ 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.
+ // FIXME: Should handle multiple compile units.
+ if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
+ NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_sec_offset,
+ DwarfLineSectionSym);
+ 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);
+ SkeletonCUs.push_back(NewCU);
+
+ return NewCU;
+}
+
+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);
+}