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a2029fa58e
In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
89 lines
3.7 KiB
LLVM
89 lines
3.7 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump -debug-line - | FileCheck %s
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; RUN: %llc_dwarf < %s -filetype=asm | FileCheck --check-prefix=ASM %s
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; If multiple line tables are emitted, one per CU, those line tables can
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; unambiguously rely on the comp_dir of their owning CU and use directory '0'
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; to refer to it.
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; CHECK: .debug_line contents:
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; CHECK-NEXT: debug_line[{{.*}}]
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; CHECK-NEXT: Line table prologue:
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; CHECK-NOT: include_directories
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; CHECK: file_names[ 1]
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; CHECK: name: "a.cpp"
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; CHECK-NEXT: dir_index: 0
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; CHECK-NOT: file_names
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; CHECK: debug_line[{{.*}}]
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; CHECK-NEXT: Line table prologue:
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; CHECK-NOT: include_directories
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; CHECK: file_names[ 1]
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; CHECK: name: "b.cpp"
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; CHECK-NEXT: dir_index: 0
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; CHECK-NOT: file_names
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; However, if a single line table is emitted and shared between CUs, the
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; comp_dir is ambiguous and relying on it would lead to different path
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; interpretations depending on which CU lead to the table - so ensure that
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; full paths are always emitted in this case, never comp_dir relative.
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; ASM: .file 1 "/tmp/dbginfo/a{{[/\\]+}}a.cpp"
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; ASM: .file 2 "/tmp/dbginfo/b{{[/\\]+}}b.cpp"
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; Generated from the following source compiled to bitcode from within their
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; respective directories (with debug info) and linked together with llvm-link
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; a/a.cpp
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; void func() {
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; }
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; b/b.cpp
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; void func();
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; int main() {
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; func();
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; }
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; Function Attrs: nounwind uwtable
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define void @_Z4funcv() #0 !dbg !4 {
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entry:
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ret void, !dbg !19
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}
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; Function Attrs: uwtable
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define i32 @main() #1 !dbg !11 {
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entry:
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call void @_Z4funcv(), !dbg !20
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ret i32 0, !dbg !21
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}
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0, !8}
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!llvm.module.flags = !{!16, !17}
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!llvm.ident = !{!18, !18}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo/a")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "func", linkageName: "_Z4funcv", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo/a")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !9, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!9 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo/b")
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!11 = distinct !DISubprogram(name: "main", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !8, scopeLine: 2, file: !9, scope: !12, type: !13, retainedNodes: !2)
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!12 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo/b")
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!13 = !DISubroutineType(types: !14)
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!14 = !{!15}
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!15 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!16 = !{i32 2, !"Dwarf Version", i32 4}
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!17 = !{i32 1, !"Debug Info Version", i32 3}
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!18 = !{!"clang version 3.5.0 "}
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!19 = !DILocation(line: 2, scope: !4)
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!20 = !DILocation(line: 3, scope: !11)
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!21 = !DILocation(line: 4, scope: !11)
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