[llvm] r337981 - [DWARF v5] Don't emit multiple DW_AT_rnglists_base attributes. Some refactoring of
David Blaikie via llvm-commits
llvm-commits at lists.llvm.org
Mon Jul 30 13:43:54 PDT 2018
Adrian, Jonas - could you two take a look at this test failure/issue & see
if it could be fixed.
Wolfgang - what was the change you made/undid from your original patch?
On Thu, Jul 26, 2018 at 3:53 PM via llvm-commits <
llvm-commits at lists.llvm.org> wrote:
> Thanks, Alex.
>
>
>
> I resubmitted the patch as r338081 with a fix. It’s a bit unfortunate, b/c
> the compiler was actually being more efficient about not emitting a
> __debug_ranges section when none is needed. The test, however, checks for
> it anyway. I didn’t want to mess with the test because its purpose is a bit
> different, so I restored the old behavior for dwarf version 4 and earlier.
>
> Let me know if you see any more problems.
>
>
>
> -- wolfgang
>
>
>
> *From:* llvm-commits [mailto:llvm-commits-bounces at lists.llvm.org] *On
> Behalf Of *Alex L via llvm-commits
> *Sent:* Wednesday, July 25, 2018 8:23 PM
> *To:* Pieb, Wolfgang
> *Cc:* Alex Lorenz via llvm-commits
> *Subject:* Re: [llvm] r337981 - [DWARF v5] Don't emit multiple
> DW_AT_rnglists_base attributes. Some refactoring of
>
>
>
> Hi,
>
>
>
> Unfortunately I had to revert this commit (revert in r337997) as it caused
> a regression in the debuginfo-tests:
>
>
>
> FAIL: debuginfo-tests :: apple-accel.cpp (40748 of 46595) ********************
> TEST 'debuginfo-tests :: apple-accel.cpp' FAILED ******************** Script:
> -- : 'RUN: at line 6';
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/clang-build/bin/clang
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/llvm/tools/clang/test/debuginfo-tests/apple-accel.cpp
> --target=x86_64-apple-darwin17.6.0 -gdwarf-2 -O0 -c -g -o
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/clang-build/tools/clang/test/debuginfo-tests/Output/apple-accel.cpp.tmp-ex
> : 'RUN: at line 7'; llvm-objdump -section-headers
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/clang-build/tools/clang/test/debuginfo-tests/Output/apple-accel.cpp.tmp-ex
> |
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/clang-build/bin/FileCheck
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/llvm/tools/clang/test/debuginfo-tests/apple-accel.cpp
> : 'RUN: at line 8';
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/clang-build/bin/clang
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/llvm/tools/clang/test/debuginfo-tests/apple-accel.cpp
> --target=x86_64-apple-darwin17.6.0 -gdwarf-4 -O0 -c -g -o
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/clang-build/tools/clang/test/debuginfo-tests/Output/apple-accel.cpp.tmp-ex
> : 'RUN: at line 9'; llvm-objdump -section-headers
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/clang-build/tools/clang/test/debuginfo-tests/Output/apple-accel.cpp.tmp-ex
> |
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/clang-build/bin/FileCheck
> /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/llvm/tools/clang/test/debuginfo-tests/apple-accel.cpp
> -- Exit Code: 1 Command Output (stderr): -- /Users/buildslave/jenkins/workspace/clang-stage1-configure-RA/llvm/tools/clang/test/debuginfo-tests/apple-accel.cpp:16:16:
> error: CHECK-NEXT: expected string not found in input // CHECK-NEXT:
> __debug_ranges ^ <stdin>:9:17: note: scanning from here 3 __debug_info
> 00000087 0000000000000182 DATA ^ <stdin>:10:4: note: possible intended
> match here 4 __debug_macinfo 00000001 0000000000000209 DATA ^ --
> ********************
>
>
>
> Here's the failure in our CI:
> http://lab.llvm.org:8080/green/job/clang-stage1-configure-RA/47691/consoleFull
>
>
>
> Let me know if you need assistance investigating/verifying a fix.
>
> Thanks,
>
> Alex
>
>
>
>
>
> On 25 July 2018 at 16:03, Wolfgang Pieb via llvm-commits <
> llvm-commits at lists.llvm.org> wrote:
>
> Author: wolfgangp
> Date: Wed Jul 25 16:03:22 2018
> New Revision: 337981
>
> URL: http://llvm.org/viewvc/llvm-project?rev=337981&view=rev
> Log:
> [DWARF v5] Don't emit multiple DW_AT_rnglists_base attributes. Some
> refactoring of
> range lists emissions and added test cases.
>
> Reviewer: dblaikie
>
> Differential Revision: https://reviews.llvm.org/D49522
>
> Added:
> llvm/trunk/test/DebugInfo/X86/rnglists_base_attr.ll
> llvm/trunk/test/DebugInfo/X86/rnglists_curanges.ll
> Modified:
> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h
> llvm/trunk/test/DebugInfo/X86/cu-ranges.ll
>
> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp?rev=337981&r1=337980&r2=337981&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp (original)
> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp Wed Jul 25
> 16:03:22 2018
> @@ -420,8 +420,6 @@ void DwarfCompileUnit::addScopeRangeList
> } else {
> addSectionLabel(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
> RangeSectionSym);
> - if (DD->getDwarfVersion() >= 5)
> - addRnglistsBase();
> }
>
> // Add the range list to the set of ranges to be emitted.
>
> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp?rev=337981&r1=337980&r2=337981&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp (original)
> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp Wed Jul 25 16:03:22
> 2018
> @@ -820,6 +820,10 @@ void DwarfDebug::finalizeModuleInfo() {
> U.attachRangesOrLowHighPC(U.getUnitDie(), TheCU.takeRanges());
> }
>
> + if (getDwarfVersion() >= 5 && !useSplitDwarf() &&
> + !U.getRangeLists().empty())
> + U.addRnglistsBase();
> +
> auto *CUNode = cast<DICompileUnit>(P.first);
> // If compile Unit has macros, emit "DW_AT_macro_info" attribute.
> if (CUNode->getMacros())
> @@ -2086,23 +2090,10 @@ static void emitRangeList(AsmPrinter *As
> }
> }
>
> -void DwarfDebug::emitDebugRnglists() {
> -
> - // Don't emit a rangelist table if there are no ranges.
> - if (llvm::all_of(CUMap,
> - [](const decltype(CUMap)::const_iterator::value_type
> &Pair) {
> - DwarfCompileUnit *TheCU = Pair.second;
> - if (auto *Skel = TheCU->getSkeleton())
> - TheCU = Skel;
> - return TheCU->getRangeLists().empty();
> - }))
> - return;
> -
> - assert(getDwarfVersion() >= 5 && "Dwarf version must be 5 or greater");
> - // FIXME: As long as we don't support DW_RLE_base_addrx, we cannot
> generate
> - // any tables in the .debug_rnglists.dwo section.
> - Asm->OutStreamer->SwitchSection(
> - Asm->getObjFileLowering().getDwarfRnglistsSection());
> +// Emit the header of a DWARF 5 range list table. Returns the symbol that
> +// designates the end of the table for the caller to emit when the table
> is
> +// complete.
> +static MCSymbol *emitRnglistsTableHeader(AsmPrinter *Asm, DwarfFile
> &Holder) {
> // The length is described by a starting label right after the length
> field
> // and an end label.
> MCSymbol *TableStart =
> Asm->createTempSymbol("debug_rnglist_table_start");
> @@ -2111,56 +2102,52 @@ void DwarfDebug::emitDebugRnglists() {
> Asm->EmitLabelDifference(TableEnd, TableStart, 4);
> Asm->OutStreamer->EmitLabel(TableStart);
> // Version number (DWARF v5 and later).
> - Asm->emitInt16(getDwarfVersion());
> + Asm->emitInt16(Asm->OutStreamer->getContext().getDwarfVersion());
> // Address size.
> Asm->emitInt8(Asm->MAI->getCodePointerSize());
> // Segment selector size.
> Asm->emitInt8(0);
>
> - MCSymbol *RnglistTableBaseSym =
> - (useSplitDwarf() ? SkeletonHolder :
> InfoHolder).getRnglistsTableBaseSym();
> + MCSymbol *RnglistTableBaseSym = Holder.getRnglistsTableBaseSym();
>
> // FIXME: Generate the offsets table and use DW_FORM_rnglistx with the
> // DW_AT_ranges attribute. Until then set the number of offsets to 0.
> Asm->emitInt32(0);
> Asm->OutStreamer->EmitLabel(RnglistTableBaseSym);
> -
> - // Emit the individual range lists.
> - for (const auto &I : CUMap) {
> - DwarfCompileUnit *TheCU = I.second;
> - if (auto *Skel = TheCU->getSkeleton())
> - TheCU = Skel;
> - for (const RangeSpanList &List : TheCU->getRangeLists())
> - emitRangeList(Asm, TheCU, List);
> - }
> -
> - Asm->OutStreamer->EmitLabel(TableEnd);
> + return TableEnd;
> }
>
> -/// Emit address ranges into the .debug_ranges section or DWARF v5
> rangelists
> -/// into the .debug_rnglists section.
> +/// Emit address ranges into the .debug_ranges section or into the DWARF
> v5
> +/// .debug_rnglists section.
> void DwarfDebug::emitDebugRanges() {
> if (CUMap.empty())
> return;
>
> + auto NoRangesPresent = [this]() {
> + return llvm::all_of(
> + CUMap, [](const decltype(CUMap)::const_iterator::value_type
> &Pair) {
> + return Pair.second->getRangeLists().empty();
> + });
> + };
> +
> if (!useRangesSection()) {
> - assert(llvm::all_of(
> - CUMap,
> - [](const decltype(CUMap)::const_iterator::value_type
> &Pair) {
> - return Pair.second->getRangeLists().empty();
> - }) &&
> - "No debug ranges expected.");
> + assert(NoRangesPresent() && "No debug ranges expected.");
> return;
> }
>
> - if (getDwarfVersion() >= 5) {
> - emitDebugRnglists();
> + if (NoRangesPresent())
> return;
> - }
>
> // Start the dwarf ranges section.
> - Asm->OutStreamer->SwitchSection(
> - Asm->getObjFileLowering().getDwarfRangesSection());
> + MCSymbol *TableEnd = nullptr;
> + if (getDwarfVersion() >= 5) {
> + Asm->OutStreamer->SwitchSection(
> + Asm->getObjFileLowering().getDwarfRnglistsSection());
> + TableEnd = emitRnglistsTableHeader(Asm, useSplitDwarf() ?
> SkeletonHolder
> + : InfoHolder);
> + } else
> + Asm->OutStreamer->SwitchSection(
> + Asm->getObjFileLowering().getDwarfRangesSection());
>
> // Grab the specific ranges for the compile units in the module.
> for (const auto &I : CUMap) {
> @@ -2173,6 +2160,9 @@ void DwarfDebug::emitDebugRanges() {
> for (const RangeSpanList &List : TheCU->getRangeLists())
> emitRangeList(Asm, TheCU, List);
> }
> +
> + if (TableEnd)
> + Asm->OutStreamer->EmitLabel(TableEnd);
> }
>
> void DwarfDebug::handleMacroNodes(DIMacroNodeArray Nodes,
> DwarfCompileUnit &U) {
> @@ -2248,9 +2238,6 @@ void DwarfDebug::initSkeletonUnit(const
> SkeletonHolder.addUnit(std::move(NewU));
> }
>
> -// 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_addr_base, DW_AT_ranges_base or DW_AT_rnglists_base.
> DwarfCompileUnit &DwarfDebug::constructSkeletonCU(const DwarfCompileUnit
> &CU) {
>
> auto OwnedUnit = llvm::make_unique<DwarfCompileUnit>(
>
> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h?rev=337981&r1=337980&r2=337981&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h (original)
> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.h Wed Jul 25 16:03:22 2018
> @@ -423,8 +423,13 @@ class DwarfDebug : public DebugHandlerBa
> void initSkeletonUnit(const DwarfUnit &U, DIE &Die,
> std::unique_ptr<DwarfCompileUnit> NewU);
>
> - /// Construct the split debug info compile unit for the debug info
> - /// section.
> + /// Construct the split debug info compile unit for the debug info
> section.
> + /// In DWARF v5, the skeleton unit DIE may have the following
> attributes:
> + /// DW_AT_addr_base, DW_AT_comp_dir, DW_AT_dwo_name, DW_AT_high_pc,
> + /// DW_AT_low_pc, DW_AT_ranges, DW_AT_stmt_list, and
> DW_AT_str_offsets_base.
> + /// Prior to DWARF v5 it may also have DW_AT_GNU_dwo_id.
> DW_AT_GNU_dwo_name
> + /// is used instead of DW_AT_dwo_name, Dw_AT_GNU_addr_base instead of
> + /// DW_AT_addr_base, and DW_AT_GNU_ranges_base instead of
> DW_AT_rnglists_base.
> DwarfCompileUnit &constructSkeletonCU(const DwarfCompileUnit &CU);
>
> /// Emit the debug info dwo section.
>
> Modified: llvm/trunk/test/DebugInfo/X86/cu-ranges.ll
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/cu-ranges.ll?rev=337981&r1=337980&r2=337981&view=diff
>
> ==============================================================================
> --- llvm/trunk/test/DebugInfo/X86/cu-ranges.ll (original)
> +++ llvm/trunk/test/DebugInfo/X86/cu-ranges.ll Wed Jul 25 16:03:22 2018
> @@ -5,6 +5,9 @@
> ; RUN: llc -split-dwarf-file=foo.dwo -O0 %s
> -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
> ; RUN: llvm-dwarfdump -debug-abbrev %t | FileCheck
> --check-prefix=NO-FUNCTION-SECTIONS %s
>
> +; RUN: llc -dwarf-version=5 -O0 %s -mtriple=x86_64-unknown-linux-gnu
> -filetype=obj -o %t
> +; RUN: llvm-dwarfdump -v %t | FileCheck --check-prefix=DWARF5 %s
> +
> ; From:
> ; int foo (int a) {
> ; return a+1;
> @@ -24,6 +27,14 @@
> ; NO-FUNCTION-SECTIONS: DW_AT_low_pc DW_FORM_addr
> ; NO-FUNCTION-SECTIONS-NOT: DW_AT_ranges
>
> +; For Dwarf 5 check that we neither generate DW_AT_rnglists_base for the
> CU DIE nor
> +; a .debug_rnglists section. There is only 1 CU range with no scope
> ranges.
> +;
> +; DWARF5: .debug_info contents:
> +; DWARF5: DW_TAG_compile_unit
> +; DWARF5-NOT: DW_AT_rnglists_base [DW_FORM_sec_offset]
> +; DWARF5-NOT: .debug_rnglists contents:
> +
> ; Function Attrs: nounwind uwtable
> define i32 @foo(i32 %a) #0 !dbg !4 {
> entry:
>
> Added: llvm/trunk/test/DebugInfo/X86/rnglists_base_attr.ll
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/rnglists_base_attr.ll?rev=337981&view=auto
>
> ==============================================================================
> --- llvm/trunk/test/DebugInfo/X86/rnglists_base_attr.ll (added)
> +++ llvm/trunk/test/DebugInfo/X86/rnglists_base_attr.ll Wed Jul 25
> 16:03:22 2018
> @@ -0,0 +1,89 @@
> +; RUN: llc -dwarf-version=5 -O0 %s -mtriple=x86_64-unknown-linux-gnu
> -filetype=obj -o %t
> +; RUN: llvm-dwarfdump -v %t | FileCheck %s
> +
> +; Make sure we don't generate a duplicate DW_AT_rnglists_base attribute
> in the CU DIE
> +; when more than one range list is emitted.
> +; From the source:
> +;
> +; void f1();
> +; void f2() {
> +; f1();
> +; {
> +; bool b;
> +; f1();
> +; f1();
> +; }
> +; }
> +; __attribute__((section(".text.foo"))) void f3() { }
> +
> +; Compile with clang -gwarf5 -S -emit-llvm
> +; and change the resulting IR to move the first call to f1() to between
> +; the second and the third call. This, along with the dbg.declare
> instruction
> +; for the variable b, creates a gap in the code range for the nested
> lexical
> +; scope that is b's immediate parent scope. A range list is emitted for
> that scope.
> +;
> +; In addition, the placement of f3() in a different section forces a
> +; rangelist to be emitted for the CU instead of simply using low/high pc
> +; attributes.
> +
> +; CHECK: .debug_info contents:
> +; CHECK: DW_TAG_compile_unit
> +; Make sure we have 2 CU ranges.
> +; CHECK: DW_AT_ranges
> +; CHECK-NEXT: [0x{{[0-9a-f]+, 0x[0-9a-f]+}}) ".text"
> +; CHECK-NEXT: [0x{{[0-9a-f]+, 0x[0-9a-f]+}}) ".text.foo"
> +; We should not see any duplicate DW_AT_rnglists_base attributes.
> +; CHECK: DW_AT_rnglists_base [DW_FORM_sec_offset]
> (0x0000000c)
> +; CHECK-NOT: DW_AT_rnglists_base
> +;
> +; Make sure we see 2 ranges in the lexical block DIE.
> +; CHECK: DW_TAG_lexical_block
> +; CHECK-NOT: DW_TAG
> +; CHECK: DW_AT_ranges
> +; CHECK-NEXT: [0x{{[0-9a-f]+, 0x[0-9a-f]+}}) ".text"
> +; CHECK-NEXT: [0x{{[0-9a-f]+, 0x[0-9a-f]+}}) ".text"
> +
> +define dso_local void @_Z2f2v() !dbg !7 {
> +entry:
> + %b = alloca i8, align 1
> + call void @llvm.dbg.declare(metadata i8* %b, metadata !11, metadata
> !DIExpression()), !dbg !14
> + call void @_Z2f1v(), !dbg !15
> + ; The following call has been moved here from right after the alloca
> + call void @_Z2f1v(), !dbg !10
> + call void @_Z2f1v(), !dbg !16
> + ret void, !dbg !17
> +}
> +
> +declare dso_local void @_Z2f1v()
> +
> +declare void @llvm.dbg.declare(metadata, metadata, metadata)
> +
> +define dso_local void @_Z2f3v() section ".text.foo" !dbg !18 {
> +entry:
> + ret void, !dbg !19
> +}
> +
> +!llvm.dbg.cu = !{!0}
> +!llvm.module.flags = !{!3, !4, !5}
> +!llvm.ident = !{!6}
> +
> +!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1,
> producer: "clang version 7.0.0 (trunk 337837)", isOptimized: false,
> runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
> +!1 = !DIFile(filename: "t3.cpp", directory: "/home/test/rangelists",
> checksumkind: CSK_MD5, checksum: "1ba81b564a832caa8114cd008c199048")
> +!2 = !{}
> +!3 = !{i32 2, !"Dwarf Version", i32 5}
> +!4 = !{i32 2, !"Debug Info Version", i32 3}
> +!5 = !{i32 1, !"wchar_size", i32 4}
> +!6 = !{!"clang version 7.0.0 (trunk 337837)"}
> +!7 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1,
> file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine:
> 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
> +!8 = !DISubroutineType(types: !9)
> +!9 = !{null}
> +!10 = !DILocation(line: 3, column: 3, scope: !7)
> +!11 = !DILocalVariable(name: "b", scope: !12, file: !1, line: 5, type:
> !13)
> +!12 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 3)
> +!13 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
> +!14 = !DILocation(line: 5, column: 10, scope: !12)
> +!15 = !DILocation(line: 6, column: 5, scope: !12)
> +!16 = !DILocation(line: 7, column: 5, scope: !12)
> +!17 = !DILocation(line: 9, column: 1, scope: !7)
> +!18 = distinct !DISubprogram(name: "f3", linkageName: "_Z2f3v", scope:
> !1, file: !1, line: 10, type: !8, isLocal: false, isDefinition: true,
> scopeLine: 10, flags: DIFlagPrototyped, isOptimized: false, unit: !0,
> retainedNodes: !2)
> +!19 = !DILocation(line: 10, column: 51, scope: !18)
>
> Added: llvm/trunk/test/DebugInfo/X86/rnglists_curanges.ll
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/rnglists_curanges.ll?rev=337981&view=auto
>
> ==============================================================================
> --- llvm/trunk/test/DebugInfo/X86/rnglists_curanges.ll (added)
> +++ llvm/trunk/test/DebugInfo/X86/rnglists_curanges.ll Wed Jul 25 16:03:22
> 2018
> @@ -0,0 +1,50 @@
> +; RUN: llc -dwarf-version=5 -O0 %s -mtriple=x86_64-unknown-linux-gnu
> -filetype=obj -o %t
> +; RUN: llvm-dwarfdump -v %t | FileCheck %s
> +;
> +; Check that we generate DW_AT_rnglists_base in the CU die, as well as a
> range
> +; list table when we have more than 1 CU range and no scope range.
> +;
> +; Generated from:
> +;
> +; __attribute__((section("text.foo"))) void f1() {}
> +; __attribute__((section("text.bar"))) void f2() {}
> +;
> +; Compile with clangc -gdwarf-5 -O0 -S -emit-llvm
> +;
> +; CHECK: .debug_info contents:
> +; CHECK: DW_TAG_compile_unit
> +; CHECK-NOT: DW_TAG
> +; CHECK: DW_AT_rnglists_base [DW_FORM_sec_offset]
> (0x0000000c)
> +; CHECK: .debug_rnglists contents:
> +; CHECK: 0x00000000: range list header: length = 0x0000001d, version
> = 0x0005,
> +; CHECK-SAME: addr_size = 0x08, seg_size = 0x00, offset_entry_count =
> 0x00000000
> +
> +; Function Attrs: noinline nounwind optnone uwtable
> +define dso_local void @f1() section "text.foo" !dbg !7 {
> +entry:
> + ret void, !dbg !10
> +}
> +
> +; Function Attrs: noinline nounwind optnone uwtable
> +define dso_local void @f2() section "text.bar" !dbg !11 {
> +entry:
> + ret void, !dbg !12
> +}
> +
> +!llvm.dbg.cu = !{!0}
> +!llvm.module.flags = !{!3, !4, !5}
> +!llvm.ident = !{!6}
> +
> +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer:
> "clang version 7.0.0 (trunk 337470)", isOptimized: false, runtimeVersion:
> 0, emissionKind: FullDebug, enums: !2)
> +!1 = !DIFile(filename: "test3.c", directory: "/home/test/rangelists",
> checksumkind: CSK_MD5, checksum: "f3b46bc2e5bc55bdd511ae4ec29577b6")
> +!2 = !{}
> +!3 = !{i32 2, !"Dwarf Version", i32 5}
> +!4 = !{i32 2, !"Debug Info Version", i32 3}
> +!5 = !{i32 1, !"wchar_size", i32 4}
> +!6 = !{!"clang version 7.0.0 (trunk 337470)"}
> +!7 = distinct !DISubprogram(name: "f1", scope: !1, file: !1, line: 1,
> type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized:
> false, unit: !0, retainedNodes: !2)
> +!8 = !DISubroutineType(types: !9)
> +!9 = !{null}
> +!10 = !DILocation(line: 1, column: 49, scope: !7)
> +!11 = distinct !DISubprogram(name: "f2", scope: !1, file: !1, line: 2,
> type: !8, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized:
> false, unit: !0, retainedNodes: !2)
> +!12 = !DILocation(line: 2, column: 49, scope: !11)
>
>
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