void DwarfCompileUnit::initStmtList() {
// Define start line table label for each Compile Unit.
- MCSymbol *LineTableStartSym =
- Asm->OutStreamer->getDwarfLineTableSymbol(getUniqueID());
+ MCSymbol *LineTableStartSym;
+ const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+ if (DD->useSectionsAsReferences()) {
+ LineTableStartSym = TLOF.getDwarfLineSection()->getBeginSymbol();
+ } else {
+ LineTableStartSym =
+ Asm->OutStreamer->getDwarfLineTableSymbol(getUniqueID());
+ }
// DW_AT_stmt_list is a offset of line number information for this
// compile unit in debug_line section. For split dwarf this is
// left in the skeleton CU and so not included.
// The line table entries are not always emitted in assembly, so it
// is not okay to use line_table_start here.
- const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
StmtListValue =
addSectionLabel(getUnitDie(), dwarf::DW_AT_stmt_list, LineTableStartSym,
TLOF.getDwarfLineSection()->getBeginSymbol());
void DwarfCompileUnit::emitHeader(bool UseOffsets) {
// Don't bother labeling the .dwo unit, as its offset isn't used.
- if (!Skeleton) {
+ if (!Skeleton && !DD->useSectionsAsReferences()) {
LabelBegin = Asm->createTempSymbol("cu_begin");
Asm->OutStreamer->EmitLabel(LabelBegin);
}
cl::desc("Disable emission .debug_ranges section."),
cl::init(false));
+static cl::opt<DefaultOnOff> DwarfSectionsAsReferences(
+ "dwarf-sections-as-references", cl::Hidden,
+ cl::desc("Use sections+offset as references rather than labels."),
+ cl::values(clEnumVal(Default, "Default for platform"),
+ clEnumVal(Enable, "Enabled"), clEnumVal(Disable, "Disabled")),
+ cl::init(Default));
+
enum LinkageNameOption {
DefaultLinkageNames,
AllLinkageNames,
UsePubSections = !NoDwarfPubSections;
UseRangesSection = !NoDwarfRangesSection;
+ // Use sections as references.
+ UseSectionsAsReferences = DwarfSectionsAsReferences == Enable;
+
// Work around a GDB bug. GDB doesn't support the standard opcode;
// SCE doesn't support GNU's; LLDB prefers the standard opcode, which
// is defined as of DWARF 3.
}
}
+void DwarfDebug::emitSectionReference(const DwarfCompileUnit &CU) {
+ if (useSectionsAsReferences())
+ Asm->EmitDwarfOffset(CU.getSection()->getBeginSymbol(),
+ CU.getDebugSectionOffset());
+ else
+ Asm->emitDwarfSymbolReference(CU.getLabelBegin());
+}
+
void DwarfDebug::emitDebugPubSection(bool GnuStyle, StringRef Name,
DwarfCompileUnit *TheU,
const StringMap<const DIE *> &Globals) {
Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
Asm->OutStreamer->AddComment("Offset of Compilation Unit Info");
- Asm->emitDwarfSymbolReference(TheU->getLabelBegin());
+ emitSectionReference(*TheU);
Asm->OutStreamer->AddComment("Compilation Unit Length");
Asm->EmitInt32(TheU->getLength());
Asm->OutStreamer->AddComment("DWARF Arange version number");
Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
Asm->OutStreamer->AddComment("Offset Into Debug Info Section");
- Asm->emitDwarfSymbolReference(CU->getLabelBegin());
+ emitSectionReference(*CU);
Asm->OutStreamer->AddComment("Address Size (in bytes)");
Asm->EmitInt8(PtrSize);
Asm->OutStreamer->AddComment("Segment Size (in bytes)");
/// Allow emission of .debug_ranges section.
bool UseRangesSection = true;
+ /// True if the sections itself must be used as references and don't create
+ /// temp symbols inside DWARF sections.
+ bool UseSectionsAsReferences = false;
+
/// DWARF5 Experimental Options
/// @{
bool HasDwarfAccelTables;
void collectVariableInfoFromMFTable(DwarfCompileUnit &TheCU,
DenseSet<InlinedVariable> &P);
+ /// Emit the reference to the section.
+ void emitSectionReference(const DwarfCompileUnit &CU);
+
protected:
/// Gather pre-function debug information.
void beginFunctionImpl(const MachineFunction *MF) override;
/// Returns whether ranges section should be emitted.
bool useRangesSection() const { return UseRangesSection; }
+ /// Returns whether to use sections as labels rather than temp symbols.
+ bool useSectionsAsReferences() const {
+ return UseSectionsAsReferences;
+ }
+
// Experimental DWARF5 features.
/// Returns whether or not to emit tables that dwarf consumers can
--- /dev/null
+; RUN: llc -filetype=asm -O0 -mtriple=x86_64-linux-gnu < %s -dwarf-sections-as-references=Enable -dwarf-inlined-strings=Enable -no-dwarf-pub-sections -no-dwarf-ranges-section -dwarf-version 2 -debugger-tune=gdb | FileCheck %s
+
+; CHECK: .file
+
+; CHECK-NOT: .L
+
+; CHECK: .section .debug_abbrev
+; CHECK-NOT: DW_FORM_str{{p|x}}
+; CHECK-NOT: .L
+
+; CHECK: .section .debug_info
+; CHECK-NOT: .L
+; CHECK: .short 2 # DWARF version number
+; CHECK-NOT: .L
+; CHECK: .long .debug_abbrev # Offset Into Abbrev. Section
+; CHECK-NOT: .L
+; CHECK: .long .debug_line # DW_AT_stmt_list
+; CHECK-NOT: .L
+; CHECK: .long .debug_abbrev # Offset Into Abbrev. Section
+; CHECK-NOT: .L
+; CHECK: .long .debug_line # DW_AT_stmt_list
+; CHECK-NOT: .L
+; CHECK: .quad .debug_info+{{[0-9]+}} # DW_AT_type
+; CHECK-NOT: .L
+; CHECK: .byte 0 # End Of Children Mark
+; CHECK-NOT: .L
+
+source_filename = "test/DebugInfo/X86/sections_as_references.ll"
+
+%struct.foo = type { i8 }
+
+@f = global %struct.foo zeroinitializer, align 1, !dbg !0
+@g = global %struct.foo zeroinitializer, align 1, !dbg !6
+
+!llvm.dbg.cu = !{!9, !12}
+!llvm.module.flags = !{!14, !15}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = !DIGlobalVariable(name: "f", scope: null, file: !2, line: 2, type: !3, isLocal: false, isDefinition: true)
+!2 = !DIFile(filename: "tu1.cpp", directory: "/dir")
+!3 = !DICompositeType(tag: DW_TAG_structure_type, name: "foo", file: !4, line: 1, size: 8, align: 8, elements: !5, identifier: "_ZTS3foo")
+!4 = !DIFile(filename: "./hdr.h", directory: "/dir")
+!5 = !{}
+!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
+!7 = !DIGlobalVariable(name: "g", scope: null, file: !8, line: 2, type: !3, isLocal: false, isDefinition: true)
+!8 = !DIFile(filename: "tu2.cpp", directory: "/dir")
+!9 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !5, retainedTypes: !10, globals: !11, imports: !5)
+!10 = !{!3}
+!11 = !{!0}
+!12 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !8, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !5, retainedTypes: !10, globals: !13, imports: !5)
+!13 = !{!6}
+!14 = !{i32 2, !"Dwarf Version", i32 2}
+!15 = !{i32 1, !"Debug Info Version", i32 3}
+