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[DebugInfo] Allow GNU macro extension to be emitted
Allow the GNU .debug_macro extension to be emitted for DWARF versions earlier than 5. The extension is basically what became DWARF 5's format, except that a DW_AT_GNU_macros attribute is emitted, and some entries like the strx entries are missing. In this patch I emit GNU's indirect entries, which are the same as DWARF 5's strp entries. This patch adds the extension behind a hidden LLVM flag, -use-gnu-debug-macro. I would later want to enable it by default when tuning for GDB and targeting DWARF versions earlier than 5. The size of a Clang 8.0 binary built with RelWithDebInfo and the flags "-gdwarf-4 -fdebug-macro" reduces from 1533 MB to 1349 MB with .debug_macro (compared to 1296 MB without -fdebug-macro). Reviewed By: SouraVX, dblaikie Differential Revision: https://reviews.llvm.org/D82975
This commit is contained in:
David Stenberg
parent
9a1cd64d35
commit
9857b3e63f
@ -147,6 +147,11 @@ static cl::opt<DefaultOnOff> DwarfSectionsAsReferences(
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clEnumVal(Enable, "Enabled"), clEnumVal(Disable, "Disabled")),
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cl::init(Default));
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static cl::opt<bool>
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UseGNUDebugMacro("use-gnu-debug-macro", cl::Hidden,
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cl::desc("Emit the GNU .debug_macro format with DWARF <5"),
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cl::init(false));
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enum LinkageNameOption {
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DefaultLinkageNames,
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AllLinkageNames,
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@ -428,7 +433,10 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
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// the debug entry values feature. It can also be enabled explicitly.
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EmitDebugEntryValues = Asm->TM.Options.ShouldEmitDebugEntryValues();
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UseDebugMacroSection = DwarfVersion >= 5;
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// It is unclear if the GCC .debug_macro extension is well-specified
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// for split DWARF. For now, do not allow LLVM to emit it.
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UseDebugMacroSection =
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DwarfVersion >= 5 || (UseGNUDebugMacro && !useSplitDwarf());
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Asm->OutStreamer->getContext().setDwarfVersion(DwarfVersion);
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}
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@ -1353,10 +1361,13 @@ void DwarfDebug::finalizeModuleInfo() {
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TheCU.addSectionDelta(
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TheCU.getUnitDie(), dwarf::DW_AT_macros, U.getMacroLabelBegin(),
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TLOF.getDwarfMacroDWOSection()->getBeginSymbol());
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else
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U.addSectionLabel(U.getUnitDie(), dwarf::DW_AT_macros,
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U.getMacroLabelBegin(),
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else {
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dwarf::Attribute MacrosAttr = getDwarfVersion() >= 5
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? dwarf::DW_AT_macros
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: dwarf::DW_AT_GNU_macros;
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U.addSectionLabel(U.getUnitDie(), MacrosAttr, U.getMacroLabelBegin(),
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TLOF.getDwarfMacroSection()->getBeginSymbol());
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}
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} else {
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if (useSplitDwarf())
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TheCU.addSectionDelta(
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@ -2980,16 +2991,17 @@ void DwarfDebug::emitDebugRangesDWO() {
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Asm->getObjFileLowering().getDwarfRnglistsDWOSection());
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}
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/// Emit the header of a DWARF 5 macro section.
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/// Emit the header of a DWARF 5 macro section, or the GNU extension for
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/// DWARF 4.
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static void emitMacroHeader(AsmPrinter *Asm, const DwarfDebug &DD,
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const DwarfCompileUnit &CU) {
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const DwarfCompileUnit &CU, uint16_t DwarfVersion) {
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enum HeaderFlagMask {
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#define HANDLE_MACRO_FLAG(ID, NAME) MACRO_FLAG_##NAME = ID,
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#include "llvm/BinaryFormat/Dwarf.def"
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};
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uint8_t Flags = 0;
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Asm->OutStreamer->AddComment("Macro information version");
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Asm->emitInt16(5);
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Asm->emitInt16(DwarfVersion >= 5 ? DwarfVersion : 4);
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// We are setting Offset and line offset flags unconditionally here,
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// since we're only supporting DWARF32 and line offset should be mostly
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// present.
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@ -3024,6 +3036,7 @@ void DwarfDebug::emitMacro(DIMacro &M) {
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std::string Str = Value.empty() ? Name.str() : (Name + " " + Value).str();
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if (UseDebugMacroSection) {
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if (getDwarfVersion() >= 5) {
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unsigned Type = M.getMacinfoType() == dwarf::DW_MACINFO_define
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? dwarf::DW_MACRO_define_strx
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: dwarf::DW_MACRO_undef_strx;
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@ -3034,6 +3047,20 @@ void DwarfDebug::emitMacro(DIMacro &M) {
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Asm->OutStreamer->AddComment("Macro String");
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Asm->emitULEB128(
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InfoHolder.getStringPool().getIndexedEntry(*Asm, Str).getIndex());
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} else {
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unsigned Type = M.getMacinfoType() == dwarf::DW_MACINFO_define
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? dwarf::DW_MACRO_GNU_define_indirect
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: dwarf::DW_MACRO_GNU_undef_indirect;
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Asm->OutStreamer->AddComment(dwarf::GnuMacroString(Type));
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Asm->emitULEB128(Type);
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Asm->OutStreamer->AddComment("Line Number");
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Asm->emitULEB128(M.getLine());
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Asm->OutStreamer->AddComment("Macro String");
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// FIXME: Add support for DWARF64.
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Asm->OutStreamer->emitSymbolValue(
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InfoHolder.getStringPool().getEntry(*Asm, Str).getSymbol(),
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/*Size=*/4);
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}
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} else {
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Asm->OutStreamer->AddComment(dwarf::MacinfoString(M.getMacinfoType()));
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Asm->emitULEB128(M.getMacinfoType());
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@ -3071,8 +3098,9 @@ void DwarfDebug::emitMacroFile(DIMacroFile &F, DwarfCompileUnit &U) {
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// so for readibility/uniformity, We are explicitly emitting those.
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assert(F.getMacinfoType() == dwarf::DW_MACINFO_start_file);
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if (UseDebugMacroSection)
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emitMacroFileImpl(F, U, dwarf::DW_MACRO_start_file,
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dwarf::DW_MACRO_end_file, dwarf::MacroString);
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emitMacroFileImpl(
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F, U, dwarf::DW_MACRO_start_file, dwarf::DW_MACRO_end_file,
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(getDwarfVersion() >= 5) ? dwarf::MacroString : dwarf::GnuMacroString);
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else
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emitMacroFileImpl(F, U, dwarf::DW_MACINFO_start_file,
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dwarf::DW_MACINFO_end_file, dwarf::MacinfoString);
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@ -3090,7 +3118,7 @@ void DwarfDebug::emitDebugMacinfoImpl(MCSection *Section) {
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Asm->OutStreamer->SwitchSection(Section);
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Asm->OutStreamer->emitLabel(U.getMacroLabelBegin());
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if (UseDebugMacroSection)
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emitMacroHeader(Asm, *this, U);
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emitMacroHeader(Asm, *this, U, getDwarfVersion());
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handleMacroNodes(Macros, U);
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Asm->OutStreamer->AddComment("End Of Macro List Mark");
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Asm->emitInt8(0);
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50
test/DebugInfo/X86/debug-macro-gnu-dwo.ll
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50
test/DebugInfo/X86/debug-macro-gnu-dwo.ll
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@ -0,0 +1,50 @@
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; It is unclear if the GNU .debug_macro extension is well-specified for split
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; DWARF. For now, verify that a .debug_macinfo.dwo section is emitted when
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; -gdwarf-4 -gsplit-dwarf -fdebug-macro is specified, regardless of the GNU
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; extension being requested.
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; RUN: %llc_dwarf -dwarf-version=4 -O0 -filetype=obj -use-gnu-debug-macro \
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; RUN: -split-dwarf-file=foo.dwo < %s | llvm-dwarfdump -v - | FileCheck %s
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; CHECK: .debug_info.dwo contents:
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; CHECK: DW_AT_macro_info [DW_FORM_sec_offset] (0x00000000)
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; CHECK-LABEL: .debug_macinfo.dwo contents:
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; CHECK-NEXT: 0x00000000:
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; CHECK-NEXT: DW_MACINFO_start_file - lineno: 0 filenum: 1
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; CHECK-NEXT: DW_MACINFO_start_file - lineno: 1 filenum: 2
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; CHECK-NEXT: DW_MACINFO_define - lineno: 1 macro: FOO 5
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; CHECK-NEXT: DW_MACINFO_end_file
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; CHECK-NEXT: DW_MACINFO_start_file - lineno: 2 filenum: 3
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; CHECK-NEXT: DW_MACINFO_undef - lineno: 14 macro: YEA
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; CHECK-NEXT: DW_MACINFO_end_file
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; CHECK-NEXT: DW_MACINFO_undef - lineno: 14 macro: YEA
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; CHECK-NEXT: DW_MACINFO_end_file
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; ModuleID = 'test.c'
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source_filename = "test.c"
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target datalayout = "e-m:e-p200:32:32-p201:32:32-p202:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!14, !15, !16}
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!llvm.ident = !{!17}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, macros: !3, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/home/")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIMacroFile(file: !1, nodes: !5)
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!5 = !{!6, !10, !13}
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!6 = !DIMacroFile(line: 1, file: !7, nodes: !8)
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!7 = !DIFile(filename: "./foo.h", directory: "/home/")
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!8 = !{!9}
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!9 = !DIMacro(type: DW_MACINFO_define, line: 1, name: "FOO", value: "5")
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!10 = !DIMacroFile(line: 2, file: !11, nodes: !12)
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!11 = !DIFile(filename: "./bar.h", directory: "/home/")
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!12 = !{!13}
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!13 = !DIMacro(type: DW_MACINFO_undef, line: 14, name: "YEA")
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!14 = !{i32 7, !"Dwarf Version", i32 4}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = !{i32 1, !"wchar_size", i32 4}
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!17 = !{!"clang version 10.0.0"}
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47
test/DebugInfo/X86/debug-macro-gnu.ll
Normal file
47
test/DebugInfo/X86/debug-macro-gnu.ll
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@ -0,0 +1,47 @@
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; This test checks emission of the GNU extension for the .debug_macro section.
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; RUN: %llc_dwarf -dwarf-version=4 -O0 -use-gnu-debug-macro -filetype=obj < %s | llvm-dwarfdump -v - | FileCheck %s
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; CHECK-LABEL: .debug_info contents:
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; CHECK: DW_AT_GNU_macros [DW_FORM_sec_offset] (0x00000000)
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; CHECK-LABEL: .debug_macro contents:
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; CHECK-NEXT: 0x00000000:
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; CHECK-NEXT: macro header: version = 0x0004, flags = 0x02, format = DWARF32, debug_line_offset = 0x0000
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; CHECK-NEXT: DW_MACRO_GNU_start_file - lineno: 0 filenum: 1
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; CHECK-NEXT: DW_MACRO_GNU_start_file - lineno: 1 filenum: 2
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; CHECK-NEXT: DW_MACRO_GNU_define_indirect - lineno: 1 macro: FOO 5
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; CHECK-NEXT: DW_MACRO_GNU_end_file
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; CHECK-NEXT: DW_MACRO_GNU_start_file - lineno: 2 filenum: 3
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; CHECK-NEXT: DW_MACRO_GNU_undef_indirect - lineno: 14 macro: YEA
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; CHECK-NEXT: DW_MACRO_GNU_end_file
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; CHECK-NEXT: DW_MACRO_GNU_undef_indirect - lineno: 14 macro: YEA
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; CHECK-NEXT: DW_MACRO_GNU_end_file
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; ModuleID = 'test.c'
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source_filename = "test.c"
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target datalayout = "e-m:e-p200:32:32-p201:32:32-p202:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!14, !15, !16}
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!llvm.ident = !{!17}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, macros: !3, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/home/")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIMacroFile(file: !1, nodes: !5)
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!5 = !{!6, !10, !13}
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!6 = !DIMacroFile(line: 1, file: !7, nodes: !8)
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!7 = !DIFile(filename: "./foo.h", directory: "/home/")
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!8 = !{!9}
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!9 = !DIMacro(type: DW_MACINFO_define, line: 1, name: "FOO", value: "5")
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!10 = !DIMacroFile(line: 2, file: !11, nodes: !12)
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!11 = !DIFile(filename: "./bar.h", directory: "/home/")
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!12 = !{!13}
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!13 = !DIMacro(type: DW_MACINFO_undef, line: 14, name: "YEA")
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!14 = !{i32 7, !"Dwarf Version", i32 4}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = !{i32 1, !"wchar_size", i32 4}
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!17 = !{!"clang version 10.0.0"}
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