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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
146 lines
6.0 KiB
LLVM
146 lines
6.0 KiB
LLVM
; REQUIRES: object-emission
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; Generated from the following source compiled with clang++ -gmlt:
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; void f1() {}
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; void __attribute__((section("__TEXT,__bar"))) f2() {}
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; void __attribute__((always_inline)) f3() { f1(); }
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; void f4() { f3(); }
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; Check that
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; * -gmlt includes no DW_TAG_subprograms for subprograms without inlined
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; subroutines.
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; * yet still produces DW_AT_ranges and a range list in debug_ranges that
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; describes those subprograms
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_AT_ranges [DW_FORM_sec_offset] (0x00000000
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; CHECK-NOT: {{DW_TAG|NULL}}
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; Omitting the subprograms without inlined subroutines is not possible
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; currently on Darwin as dsymutil will drop the whole CU if it has no subprograms
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; (which happens with this optimization if there are no inlined subroutines).
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; DARWIN: DW_TAG_subprogram
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; DARWIN-NOT: DW_TAG
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; DARWIN: DW_AT_name {{.*}} "f1"
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; DARWIN-NOT: {{DW_TAG|NULL}}
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; DARWIN: DW_TAG_subprogram
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; DARWIN-NOT: DW_TAG
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; DARWIN: DW_AT_name {{.*}} "f2"
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; DARWIN-NOT: {{DW_TAG|NULL}}
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; DARWIN: DW_TAG_subprogram
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; DARWIN-NOT: DW_TAG
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; Can't check the abstract_origin value across the DARWIN/CHECK checking and
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; ordering, so don't bother - just trust me, it refers to f3 down there.
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; DARWIN: DW_AT_abstract_origin
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; DARWIN-NOT: {{DW_TAG|NULL}}
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; FIXME: Emitting separate abstract definitions is inefficient when we could
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; just attach the DW_AT_name to the inlined_subroutine directly. Except that
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; would produce many string relocations. Implement string indexing in the
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; skeleton CU to address the relocation problem, then remove abstract
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; definitions from -gmlt here.
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; CHECK: DW_TAG_subprogram
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; CHECK-NEXT: DW_AT_name {{.*}} "f3"
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; FIXME: We don't really need DW_AT_inline, consumers can ignore this due to
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; the absence of high_pc/low_pc/ranges and know that they just need it for
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; retrieving the name of a concrete inlined instance
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; CHECK-NOT: {{DW_TAG|DW_AT|NULL}}
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; Check that we only provide the minimal attributes on a subprogram to save space.
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; CHECK: DW_TAG_subprogram
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; CHECK-NEXT: DW_AT_low_pc
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; CHECK-NEXT: DW_AT_high_pc
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; CHECK-NEXT: DW_AT_name
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; CHECK-NOT: {{DW_TAG|DW_AT}}
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; CHECK: DW_TAG_inlined_subroutine
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; As mentioned above - replace DW_AT_abstract_origin with DW_AT_name to save
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; space once we have support for string indexing in non-dwo sections
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; CHECK-NEXT: DW_AT_abstract_origin {{.*}} "f3"
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; CHECK-NEXT: DW_AT_low_pc
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; CHECK-NEXT: DW_AT_high_pc
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; CHECK-NEXT: DW_AT_call_file
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; CHECK-NEXT: DW_AT_call_line
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; Make sure we don't have any other subprograms here (subprograms with no
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; inlined subroutines are omitted by design to save space)
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; CHECK-NOT: {{DW_TAG|DW_AT}}
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; CHECK: NULL
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; CHECK-NOT: {{DW_TAG|DW_AT}}
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; CHECK: NULL
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; CHECK: .debug_ranges contents:
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; ... some addresses (depends on platform (such as platforms with function
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; reordering in the linker), and looks wonky on platforms with zero values
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; written in relocation places (dumper needs to be fixed to read the
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; relocations rather than interpret that as the end of a range list))
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; CHECK: 00000000 <End of list>
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; Check that we don't emit any pubnames or pubtypes under -gmlt
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; CHECK-NOT: .debug_pubnames contents:
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; CHECK-NOT: .debug_pubtypes contents:
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; Function Attrs: nounwind uwtable
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define void @_Z2f1v() #0 !dbg !4 {
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entry:
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ret void, !dbg !13
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}
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; Function Attrs: nounwind uwtable
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define void @_Z2f2v() #0 section "__TEXT,__bar" !dbg !7 {
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entry:
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ret void, !dbg !14
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}
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; Function Attrs: alwaysinline nounwind uwtable
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define void @_Z2f3v() #1 !dbg !8 {
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entry:
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call void @_Z2f1v(), !dbg !15
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ret void, !dbg !16
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}
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; Function Attrs: nounwind uwtable
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define void @_Z2f4v() #0 !dbg !9 {
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entry:
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call void @_Z2f1v() #2, !dbg !17
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ret void, !dbg !19
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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 = { alwaysinline 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 #2 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!10, !11}
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!llvm.ident = !{!12}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "gmlt.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f1", 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: "gmlt.cpp", directory: "/tmp/dbginfo")
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!6 = !DISubroutineType(types: !2)
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!7 = distinct !DISubprogram(name: "f2", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 2, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!8 = distinct !DISubprogram(name: "f3", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!9 = distinct !DISubprogram(name: "f4", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 4, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{!"clang version 3.6.0 "}
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!13 = !DILocation(line: 1, column: 12, scope: !4)
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!14 = !DILocation(line: 2, column: 53, scope: !7)
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!15 = !DILocation(line: 3, column: 44, scope: !8)
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!16 = !DILocation(line: 3, column: 50, scope: !8)
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!17 = !DILocation(line: 3, column: 44, scope: !8, inlinedAt: !18)
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!18 = !DILocation(line: 4, column: 13, scope: !9)
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!19 = !DILocation(line: 4, column: 19, scope: !9)
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