[llvm] r349207 - DebugInfo: Avoid using split DWARF when the split unit would be empty.
David Blaikie via llvm-commits
llvm-commits at lists.llvm.org
Mon Dec 17 13:11:02 PST 2018
Thanks Galina - looking into it!
On Mon, Dec 17, 2018 at 12:43 PM Galina Kistanova <gkistanova at gmail.com>
wrote:
> Hello David,
>
> It looks like this commit broke test to couple lto builders:
> The builders were already broken on build step and did not reach test
> steps. And did not send notifications also on this.
>
> http://lab.llvm.org:8011/builders/clang-with-lto-ubuntu
> http://lab.llvm.org:8011/builders/clang-with-thin-lto-ubuntu
> . . .
> Failing Tests (1):
> LLVM :: tools/gold/X86/split-dwarf.ll
>
> Please have a look?
>
> Thanks
>
>
> Galina
>
> On Fri, Dec 14, 2018 at 2:47 PM David Blaikie via llvm-commits <
> llvm-commits at lists.llvm.org> wrote:
>
>> Author: dblaikie
>> Date: Fri Dec 14 14:44:46 2018
>> New Revision: 349207
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=349207&view=rev
>> Log:
>> DebugInfo: Avoid using split DWARF when the split unit would be empty.
>>
>> In ThinLTO many split CUs may be effectively empty because of the lack
>> of support for cross-unit references in split DWARF.
>>
>> Using a split unit in those cases is just a waste/overhead - and turned
>> out to be one contributor to a significant symbolizer performance issue
>> when global variable debug info was being imported (see r348416 for the
>> primary fix) due to symbolizers seeing CUs with no ranges, assuming
>> there might still be addresses covered and walking into the split CU to
>> see if there are any ranges (when that split CU was in a DWP file, that
>> meant loading the DWP and its index, the index was extra large because
>> of all these fractured/empty CUs... and so was very expensive to load).
>>
>> (the 3rd fix which will follow, is to assume that a CU with no ranges is
>> empty rather than merely missing its CU level range data - and to not
>> walk into its DIEs (split or otherwise) in search of address information
>> that is generally not present)
>>
>> Modified:
>> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h
>> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfFile.cpp
>> llvm/trunk/test/DebugInfo/X86/fission-cu.ll
>> llvm/trunk/test/DebugInfo/X86/fission-ranges.ll
>> llvm/trunk/test/DebugInfo/X86/string-offsets-table-order.ll
>> llvm/trunk/test/DebugInfo/X86/string-offsets-table.ll
>>
>> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp?rev=349207&r1=349206&r2=349207&view=diff
>>
>> ==============================================================================
>> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp (original)
>> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp Fri Dec 14 14:44:46
>> 2018
>> @@ -568,25 +568,10 @@ void DwarfDebug::addGnuPubAttributes(Dwa
>> U.addFlag(D, dwarf::DW_AT_GNU_pubnames);
>> }
>>
>> -// Create new DwarfCompileUnit for the given metadata node with tag
>> -// DW_TAG_compile_unit.
>> -DwarfCompileUnit &
>> -DwarfDebug::getOrCreateDwarfCompileUnit(const DICompileUnit *DIUnit) {
>> - if (auto *CU = CUMap.lookup(DIUnit))
>> - return *CU;
>> - StringRef FN = DIUnit->getFilename();
>> - CompilationDir = DIUnit->getDirectory();
>> -
>> - auto OwnedUnit = llvm::make_unique<DwarfCompileUnit>(
>> - InfoHolder.getUnits().size(), DIUnit, Asm, this, &InfoHolder);
>> - DwarfCompileUnit &NewCU = *OwnedUnit;
>> +void DwarfDebug::finishUnitAttributes(const DICompileUnit *DIUnit,
>> + DwarfCompileUnit &NewCU) {
>> DIE &Die = NewCU.getUnitDie();
>> - InfoHolder.addUnit(std::move(OwnedUnit));
>> - if (useSplitDwarf()) {
>> - NewCU.setSkeleton(constructSkeletonCU(NewCU));
>> - NewCU.addString(Die, dwarf::DW_AT_GNU_dwo_name,
>> - Asm->TM.Options.MCOptions.SplitDwarfFile);
>> - }
>> + StringRef FN = DIUnit->getFilename();
>>
>> for (auto *IE : DIUnit->getImportedEntities())
>> NewCU.addImportedEntity(IE);
>> @@ -640,11 +625,6 @@ DwarfDebug::getOrCreateDwarfCompileUnit(
>> dwarf::DW_FORM_data1, RVer);
>> }
>>
>> - if (useSplitDwarf())
>> - NewCU.setSection(Asm->getObjFileLowering().getDwarfInfoDWOSection());
>> - else
>> - NewCU.setSection(Asm->getObjFileLowering().getDwarfInfoSection());
>> -
>> if (DIUnit->getDWOId()) {
>> // This CU is either a clang module DWO or a skeleton CU.
>> NewCU.addUInt(Die, dwarf::DW_AT_GNU_dwo_id, dwarf::DW_FORM_data8,
>> @@ -654,9 +634,31 @@ DwarfDebug::getOrCreateDwarfCompileUnit(
>> NewCU.addString(Die, dwarf::DW_AT_GNU_dwo_name,
>> DIUnit->getSplitDebugFilename());
>> }
>> +}
>> +// Create new DwarfCompileUnit for the given metadata node with tag
>> +// DW_TAG_compile_unit.
>> +DwarfCompileUnit &
>> +DwarfDebug::getOrCreateDwarfCompileUnit(const DICompileUnit *DIUnit) {
>> + if (auto *CU = CUMap.lookup(DIUnit))
>> + return *CU;
>> +
>> + CompilationDir = DIUnit->getDirectory();
>> +
>> + auto OwnedUnit = llvm::make_unique<DwarfCompileUnit>(
>> + InfoHolder.getUnits().size(), DIUnit, Asm, this, &InfoHolder);
>> + DwarfCompileUnit &NewCU = *OwnedUnit;
>> + InfoHolder.addUnit(std::move(OwnedUnit));
>> +
>> + if (useSplitDwarf()) {
>> + NewCU.setSkeleton(constructSkeletonCU(NewCU));
>> + NewCU.setSection(Asm->getObjFileLowering().getDwarfInfoDWOSection());
>> + } else {
>> + finishUnitAttributes(DIUnit, NewCU);
>> + NewCU.setSection(Asm->getObjFileLowering().getDwarfInfoSection());
>> + }
>>
>> CUMap.insert({DIUnit, &NewCU});
>> - CUDieMap.insert({&Die, &NewCU});
>> + CUDieMap.insert({&NewCU.getUnitDie(), &NewCU});
>> return NewCU;
>> }
>>
>> @@ -851,7 +853,12 @@ void DwarfDebug::finalizeModuleInfo() {
>> // If we're splitting the dwarf out now that we've got the entire
>> // CU then add the dwo id to it.
>> auto *SkCU = TheCU.getSkeleton();
>> - if (useSplitDwarf()) {
>> + if (useSplitDwarf() && !empty(TheCU.getUnitDie().children())) {
>> + finishUnitAttributes(TheCU.getCUNode(), TheCU);
>> + TheCU.addString(TheCU.getUnitDie(), dwarf::DW_AT_GNU_dwo_name,
>> + Asm->TM.Options.MCOptions.SplitDwarfFile);
>> + SkCU->addString(SkCU->getUnitDie(), dwarf::DW_AT_GNU_dwo_name,
>> + Asm->TM.Options.MCOptions.SplitDwarfFile);
>> // Emit a unique identifier for this CU.
>> uint64_t ID =
>> DIEHash(Asm).computeCUSignature(DWOName, TheCU.getUnitDie());
>> @@ -870,6 +877,8 @@ void DwarfDebug::finalizeModuleInfo() {
>> SkCU->addSectionLabel(SkCU->getUnitDie(),
>> dwarf::DW_AT_GNU_ranges_base,
>> Sym, Sym);
>> }
>> + } else if (SkCU) {
>> + finishUnitAttributes(SkCU->getCUNode(), *SkCU);
>> }
>>
>> // If we have code split among multiple sections or non-contiguous
>> @@ -882,7 +891,9 @@ void DwarfDebug::finalizeModuleInfo() {
>>
>> // We don't keep track of which addresses are used in which CU so
>> this
>> // is a bit pessimistic under LTO.
>> - if (!AddrPool.isEmpty())
>> + if (!AddrPool.isEmpty() &&
>> + (getDwarfVersion() >= 5 ||
>> + (SkCU && !empty(TheCU.getUnitDie().children()))))
>> U.addAddrTableBase();
>>
>> if (unsigned NumRanges = TheCU.getRanges().size()) {
>> @@ -2483,8 +2494,6 @@ void DwarfDebug::emitDebugMacinfo() {
>>
>> void DwarfDebug::initSkeletonUnit(const DwarfUnit &U, DIE &Die,
>> std::unique_ptr<DwarfCompileUnit>
>> NewU) {
>> - NewU->addString(Die, dwarf::DW_AT_GNU_dwo_name,
>> - Asm->TM.Options.MCOptions.SplitDwarfFile);
>>
>> if (!CompilationDir.empty())
>> NewU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
>>
>> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h
>> URL:
>> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h?rev=349207&r1=349206&r2=349207&view=diff
>>
>> ==============================================================================
>> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h (original)
>> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h Fri Dec 14 14:44:46
>> 2018
>> @@ -540,6 +540,8 @@ class DwarfDebug : public DebugHandlerBa
>> /// Create new DwarfCompileUnit for the given metadata node with tag
>> /// DW_TAG_compile_unit.
>> DwarfCompileUnit &getOrCreateDwarfCompileUnit(const DICompileUnit
>> *DIUnit);
>> + void finishUnitAttributes(const DICompileUnit *DIUnit,
>> + DwarfCompileUnit &NewCU);
>>
>> /// Construct imported_module or imported_declaration DIE.
>> void constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
>>
>> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfFile.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfFile.cpp?rev=349207&r1=349206&r2=349207&view=diff
>>
>> ==============================================================================
>> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfFile.cpp (original)
>> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfFile.cpp Fri Dec 14 14:44:46
>> 2018
>> @@ -39,13 +39,14 @@ void DwarfFile::emitUnit(DwarfUnit *TheU
>> if (TheU->getCUNode()->isDebugDirectivesOnly())
>> return;
>>
>> - DIE &Die = TheU->getUnitDie();
>> - MCSection *USection = TheU->getSection();
>> - Asm->OutStreamer->SwitchSection(USection);
>> + MCSection *S = TheU->getSection();
>>
>> - TheU->emitHeader(UseOffsets);
>> + if (!S)
>> + return;
>>
>> - Asm->emitDwarfDIE(Die);
>> + Asm->OutStreamer->SwitchSection(S);
>> + TheU->emitHeader(UseOffsets);
>> + Asm->emitDwarfDIE(TheU->getUnitDie());
>> }
>>
>> // Compute the size and offset for each DIE.
>>
>> Modified: llvm/trunk/test/DebugInfo/X86/fission-cu.ll
>> URL:
>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/fission-cu.ll?rev=349207&r1=349206&r2=349207&view=diff
>>
>> ==============================================================================
>> --- llvm/trunk/test/DebugInfo/X86/fission-cu.ll (original)
>> +++ llvm/trunk/test/DebugInfo/X86/fission-cu.ll Fri Dec 14 14:44:46 2018
>> @@ -25,18 +25,18 @@ source_filename = "test/DebugInfo/X86/fi
>> ; CHECK: Abbrev table for offset: 0x00000000
>> ; CHECK: [1] DW_TAG_compile_unit DW_CHILDREN_no
>> ; CHECK: DW_AT_stmt_list DW_FORM_sec_offset
>> -; CHECK: DW_AT_GNU_dwo_name DW_FORM_strp
>> ; CHECK: DW_AT_comp_dir DW_FORM_strp
>> +; CHECK: DW_AT_GNU_dwo_name DW_FORM_strp
>> ; CHECK: DW_AT_GNU_dwo_id DW_FORM_data8
>>
>> ; Check that we're using the right forms.
>> ; CHECK: .debug_abbrev.dwo contents:
>> ; CHECK: Abbrev table for offset: 0x00000000
>> ; CHECK: [1] DW_TAG_compile_unit DW_CHILDREN_yes
>> -; CHECK: DW_AT_GNU_dwo_name DW_FORM_GNU_str_index
>> ; CHECK: DW_AT_producer DW_FORM_GNU_str_index
>> ; CHECK: DW_AT_language DW_FORM_data2
>> ; CHECK: DW_AT_name DW_FORM_GNU_str_index
>> +; CHECK: DW_AT_GNU_dwo_name DW_FORM_GNU_str_index
>> ; CHECK-NOT: DW_AT_low_pc
>> ; CHECK-NOT: DW_AT_stmt_list
>> ; CHECK-NOT: DW_AT_comp_dir
>> @@ -58,48 +58,48 @@ source_filename = "test/DebugInfo/X86/fi
>> ; CHECK: .debug_info contents:
>> ; CHECK: DW_TAG_compile_unit
>> ; CHECK-NEXT: DW_AT_stmt_list [DW_FORM_sec_offset] (0x00000000)
>> -; CHECK-NEXT: DW_AT_GNU_dwo_name [DW_FORM_strp] ( .debug_str[0x00000000]
>> = "baz.dwo")
>> -; CHECK-NEXT: DW_AT_comp_dir [DW_FORM_strp] ( .debug_str[0x00000008]
>> = "/usr/local/google/home/echristo/tmp")
>> +; CHECK-NEXT: DW_AT_comp_dir [DW_FORM_strp] ( .debug_str[0x00000000]
>> = "/usr/local/google/home/echristo/tmp")
>> +; CHECK-NEXT: DW_AT_GNU_dwo_name [DW_FORM_strp] ( .debug_str[0x00000024]
>> = "baz.dwo")
>> ; CHECK-NEXT: DW_AT_GNU_dwo_id [DW_FORM_data8] (0x1f1f859683d49324)
>>
>> ; Check that the rest of the compile units have information.
>> ; CHECK: .debug_info.dwo contents:
>> ; CHECK: DW_TAG_compile_unit
>> -; CHECK: DW_AT_GNU_dwo_name [DW_FORM_GNU_str_index] ( indexed (00000000)
>> string = "baz.dwo")
>> -; CHECK: DW_AT_producer [DW_FORM_GNU_str_index] ( indexed (00000001)
>> string = "clang version 3.3 (trunk 169021) (llvm/trunk 169020)")
>> +; CHECK: DW_AT_producer [DW_FORM_GNU_str_index] ( indexed (00000002)
>> string = "clang version 3.3 (trunk 169021) (llvm/trunk 169020)")
>> ; CHECK: DW_AT_language [DW_FORM_data2] (DW_LANG_C99)
>> -; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000002)
>> string = "baz.c")
>> +; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000003)
>> string = "baz.c")
>> +; CHECK: DW_AT_GNU_dwo_name [DW_FORM_GNU_str_index] ( indexed (00000004)
>> string = "baz.dwo")
>> ; CHECK-NOT: DW_AT_low_pc
>> ; CHECK-NOT: DW_AT_stmt_list
>> ; CHECK-NOT: DW_AT_comp_dir
>> ; CHECK: DW_AT_GNU_dwo_id [DW_FORM_data8] (0x1f1f859683d49324)
>> ; CHECK: DW_TAG_variable
>> -; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000003)
>> string = "a")
>> +; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000000)
>> string = "a")
>> ; CHECK: DW_AT_type [DW_FORM_ref4] (cu + 0x{{[0-9a-f]*}} =>
>> {[[TYPE:0x[0-9a-f]*]]}
>> ; CHECK: DW_AT_external [DW_FORM_flag_present] (true)
>> ; CHECK: DW_AT_decl_file [DW_FORM_data1] (0x01)
>> ; CHECK: DW_AT_decl_line [DW_FORM_data1] (1)
>> ; CHECK: DW_AT_location [DW_FORM_exprloc] (DW_OP_GNU_addr_index 0x0)
>> ; CHECK: [[TYPE]]: DW_TAG_base_type
>> -; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000004)
>> string = "int")
>> +; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000001)
>> string = "int")
>>
>> ; CHECK: .debug_str contents:
>> -; CHECK: 0x00000000: "baz.dwo"
>> -; CHECK: 0x00000008: "/usr/local/google/home/echristo/tmp"
>> +; CHECK: 0x00000000: "/usr/local/google/home/echristo/tmp"
>> +; CHECK: 0x00000024: "baz.dwo"
>>
>> ; CHECK: .debug_str.dwo contents:
>> -; CHECK: 0x00000000: "baz.dwo"
>> -; CHECK: 0x00000008: "clang version 3.3 (trunk 169021) (llvm/trunk
>> 169020)"
>> -; CHECK: 0x0000003d: "baz.c"
>> -; CHECK: 0x00000043: "a"
>> -; CHECK: 0x00000045: "int"
>> +; CHECK: 0x00000000: "a"
>> +; CHECK: 0x00000002: "int"
>> +; CHECK: 0x00000006: "clang version 3.3 (trunk 169021) (llvm/trunk
>> 169020)"
>> +; CHECK: 0x0000003b: "baz.c"
>> +; CHECK: 0x00000041: "baz.dwo"
>>
>> ; CHECK: .debug_str_offsets.dwo contents:
>> ; CHECK: 0x00000000: 00000000
>> -; CHECK: 0x00000004: 00000008
>> -; CHECK: 0x00000008: 0000003d
>> -; CHECK: 0x0000000c: 00000043
>> -; CHECK: 0x00000010: 00000045
>> +; CHECK: 0x00000004: 00000002
>> +; CHECK: 0x00000008: 00000006
>> +; CHECK: 0x0000000c: 0000003b
>> +; CHECK: 0x00000010: 00000041
>>
>> ; Object file checks
>> ; For x86-64-linux we should have this set of relocations for the debug
>> info section
>>
>> Modified: llvm/trunk/test/DebugInfo/X86/fission-ranges.ll
>> URL:
>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/fission-ranges.ll?rev=349207&r1=349206&r2=349207&view=diff
>>
>> ==============================================================================
>> --- llvm/trunk/test/DebugInfo/X86/fission-ranges.ll (original)
>> +++ llvm/trunk/test/DebugInfo/X86/fission-ranges.ll Fri Dec 14 14:44:46
>> 2018
>> @@ -8,8 +8,8 @@
>> ; CHECK: .debug_info contents:
>> ; CHECK: DW_TAG_compile_unit
>> ; CHECK-NEXT: DW_AT_stmt_list
>> -; CHECK-NEXT: DW_AT_GNU_dwo_name
>> ; CHECK-NEXT: DW_AT_comp_dir
>> +; CHECK-NEXT: DW_AT_GNU_dwo_name
>> ; CHECK-NEXT: DW_AT_GNU_dwo_id
>> ; CHECK-NEXT: DW_AT_GNU_ranges_base
>> ; CHECK-NEXT: DW_AT_GNU_addr_base [DW_FORM_sec_offset]
>> (0x00000000)
>>
>> Modified: llvm/trunk/test/DebugInfo/X86/string-offsets-table-order.ll
>> URL:
>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/string-offsets-table-order.ll?rev=349207&r1=349206&r2=349207&view=diff
>>
>> ==============================================================================
>> --- llvm/trunk/test/DebugInfo/X86/string-offsets-table-order.ll (original)
>> +++ llvm/trunk/test/DebugInfo/X86/string-offsets-table-order.ll Fri Dec
>> 14 14:44:46 2018
>> @@ -13,11 +13,11 @@
>>
>> ; CHECK: .debug_info contents:
>> ; CHECK: DW_TAG_compile_unit
>> -; CHECK: DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000001) string
>> = "X3")
>> +; CHECK: DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000000) string
>> = "X3")
>> ; CHECK: DW_TAG_compile_unit
>> -; CHECK: DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000002) string
>> = "X2")
>> +; CHECK: DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000001) string
>> = "X2")
>> ; CHECK: DW_TAG_compile_unit
>> -; CHECK: DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000003) string
>> = "X1")
>> +; CHECK: DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000002) string
>> = "X1")
>> ; CHECK: .debug_info.dwo contents:
>>
>> ; CHECK: .debug_str contents:
>> @@ -27,10 +27,10 @@
>>
>> ; CHECK: .debug_str_offsets contents:
>> ; CHECK: Format = DWARF32, Version = 5
>> -; CHECK-NEXT: 00000000 "foo.dwo"
>> ; CHECK-NEXT: [[X3]] "X3"
>> ; CHECK-NEXT: [[X2]] "X2"
>> ; CHECK-NEXT: [[X1]] "X1"
>> +; CHECK-NEXT: "foo.dwo"
>> ; CHECK-EMPTY:
>>
>>
>>
>> Modified: llvm/trunk/test/DebugInfo/X86/string-offsets-table.ll
>> URL:
>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/string-offsets-table.ll?rev=349207&r1=349206&r2=349207&view=diff
>>
>> ==============================================================================
>> --- llvm/trunk/test/DebugInfo/X86/string-offsets-table.ll (original)
>> +++ llvm/trunk/test/DebugInfo/X86/string-offsets-table.ll Fri Dec 14
>> 14:44:46 2018
>> @@ -59,8 +59,8 @@
>> ; SPLIT: DW_TAG_compile_unit
>> ; SPLIT-NOT: {{DW_TAG|contents:}}
>> ; SPLIT: DW_AT_str_offsets_base [DW_FORM_sec_offset] (0x00000008)
>> -; SPLIT: DW_AT_GNU_dwo_name [DW_FORM_strx1] ( indexed (00000000)
>> string = "foo.dwo")
>> -; SPLIT: DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000001) string
>> = "/home/test")
>> +; SPLIT: DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000000) string
>> = "/home/test")
>> +; SPLIT: DW_AT_GNU_dwo_name [DW_FORM_strx1] ( indexed (00000001)
>> string = "foo.dwo")
>>
>> ; Check for the split CU in .debug_info.dwo.
>> ; SPLIT: .debug_info.dwo contents:
>> @@ -73,18 +73,18 @@
>> ; SPLIT-NOT: contents:
>> ; SPLIT: DW_TAG_enumerator
>> ; SPLIT-NOT: {{DW_TAG|NULL}}
>> -; SPLIT: DW_AT_name [DW_FORM_strx1] ( indexed (00000004) string
>> = "a")
>> +; SPLIT: DW_AT_name [DW_FORM_strx1] ( indexed (00000001) string
>> = "a")
>> ; SPLIT-NOT: contents:
>> ; SPLIT: DW_TAG_enumerator
>> ; SPLIT-NOT: {{DW_TAG|NULL}}
>> -; SPLIT: DW_AT_name [DW_FORM_strx1] ( indexed (00000005) string
>> = "b")
>> +; SPLIT: DW_AT_name [DW_FORM_strx1] ( indexed (00000002) string
>> = "b")
>> ;
>> ; Extract the string offsets referenced in the main file by the skeleton
>> unit.
>> ; SPLIT: .debug_str contents:
>> -; SPLIT-NEXT: 0x00000000: "foo.dwo"
>> -; SPLIT-NEXT: 0x[[STRING2SPLIT:[0-9a-f]*]]: "/home/test"
>> -; SPLIT-NEXT: 0x[[STRING3SPLIT:[0-9a-f]*]]: "E"
>> -; SPLIT-NEXT: 0x[[STRING4SPLIT:[0-9a-f]*]]: "glob"
>> +; SPLIT-NEXT: 0x[[STRHOMETESTSPLIT:[0-9a-f]*]]: "/home/test"
>> +; SPLIT-NEXT: 0x[[STRESPLIT:[0-9a-f]*]]: "E"
>> +; SPLIT-NEXT: 0x[[STRGLOBSPLIT:[0-9a-f]*]]: "glob"
>> +; SPLIT-NEXT: 0x[[STRFOODWOSPLIT:[0-9a-f]*]]: "foo.dwo"
>> ;
>> ; Extract the string offsets referenced in the .dwo file by the split
>> unit.
>> ; SPLIT: .debug_str.dwo contents:
>> @@ -98,8 +98,8 @@
>> ; referenced by the debug info.
>> ; SPLIT: .debug_str_offsets contents:
>> ; SPLIT-NEXT: 0x00000000: Contribution size = 12, Format = DWARF32,
>> Version = 5
>> -; SPLIT-NEXT: 0x00000008: 00000000 "foo.dwo"
>> -; SPLIT-NEXT: 0x0000000c: [[STRING2SPLIT]] "/home/test"
>> +; SPLIT-NEXT: 0x00000008: [[STRHOMETESTSPLIT]] "/home/test"
>> +; SPLIT-NEXT: 0x0000000c: [[STRFOODWOSPLIT]] "foo.dwo"
>> ; SPLIT-EMPTY:
>>
>> ; SPLIT: .debug_str_offsets.dwo contents:
>>
>>
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>
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