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https://github.com/RPCS3/llvm-mirror.git
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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
177 lines
7.2 KiB
LLVM
177 lines
7.2 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -v -debug-info - | FileCheck %s
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; Build from the following source with clang -O2.
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; The important details are that 'x's abstract definition is first built during
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; the definition of 'b', where the parameter to 'x' is constant and so 'x's 's'
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; variable is optimized away. No abstract definition DIE for 's' is constructed.
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; Then, during 'a' emission, the abstract DbgVariable for 's' is created, but
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; the abstract DIE isn't (since the abstract definition for 'b' is already
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; built). This results in 's' inlined in 'a' being emitted with its name, line,
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; file there, rather than referencing an abstract definition.
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; extern int t;
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;
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; void f(int);
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;
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; inline void x(bool b) {
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; if (b) {
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; int s = t;
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; f(s);
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; }
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; f(0);
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; }
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;
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; void b() {
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; x(false);
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; }
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;
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; void a(bool u) {
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; x(u);
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; }
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; CHECK: [[X_DECL:.*]]: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "x"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "b"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_lexical_block
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_variable
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "s"
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "b"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_inlined_subroutine
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} {[[X_DECL]]}
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} "b"
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; Notice 'x's local variable 's' is missing. Not necessarily a bug here,
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; since it's been optimized entirely away and it should be described in
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; abstract subprogram.
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; CHECK-NOT: DW_TAG
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; CHECK: NULL
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; CHECK-NOT: DW_TAG
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; CHECK: NULL
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "a"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_inlined_subroutine
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} {[[X_DECL]]}
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; CHECK-NOT: {{DW_TAG|NULL}}
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; FIXME: This formal parameter goes missing at least at -O2 (& on
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; mips/powerpc), maybe before that. Perhaps SelectionDAG is to blame (and
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; fastisel succeeds).
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} "b"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_lexical_block
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_variable
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} "s"
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@t = external global i32
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; Function Attrs: uwtable
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define void @_Z1bv() #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata i1 false, metadata !25, metadata !DIExpression()), !dbg !27
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tail call void @_Z1fi(i32 0), !dbg !28
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ret void, !dbg !29
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}
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; Function Attrs: uwtable
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define void @_Z1ab(i1 zeroext %u) #0 !dbg !8 {
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entry:
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tail call void @llvm.dbg.value(metadata i1 %u, metadata !13, metadata !DIExpression()), !dbg !30
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tail call void @llvm.dbg.value(metadata i1 %u, metadata !31, metadata !DIExpression()), !dbg !33
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br i1 %u, label %if.then.i, label %_Z1xb.exit, !dbg !34
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if.then.i: ; preds = %entry
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%0 = load i32, i32* @t, align 4, !dbg !35, !tbaa !36
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tail call void @llvm.dbg.value(metadata i32 %0, metadata !40, metadata !DIExpression()), !dbg !35
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tail call void @_Z1fi(i32 %0), !dbg !41
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br label %_Z1xb.exit, !dbg !42
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_Z1xb.exit: ; preds = %entry, %if.then.i
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tail call void @_Z1fi(i32 0), !dbg !43
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ret void, !dbg !44
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}
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declare void @_Z1fi(i32) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "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 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "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 readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!21, !22}
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!llvm.ident = !{!23}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "b", linkageName: "_Z1bv", line: 13, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 13, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = distinct !DISubprogram(name: "a", linkageName: "_Z1ab", line: 17, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 17, file: !1, scope: !5, type: !9, retainedNodes: !12)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null, !11}
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!11 = !DIBasicType(tag: DW_TAG_base_type, name: "bool", size: 8, align: 8, encoding: DW_ATE_boolean)
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!12 = !{!13}
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!13 = !DILocalVariable(name: "u", line: 17, arg: 1, scope: !8, file: !5, type: !11)
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!14 = distinct !DISubprogram(name: "x", linkageName: "_Z1xb", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 5, file: !1, scope: !5, type: !9, retainedNodes: !15)
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!15 = !{!16, !17}
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!16 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11)
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!17 = !DILocalVariable(name: "s", line: 7, scope: !18, file: !5, type: !20)
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!18 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !19)
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!19 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !14)
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!20 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!21 = !{i32 2, !"Dwarf Version", i32 4}
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!22 = !{i32 2, !"Debug Info Version", i32 3}
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!23 = !{!"clang version 3.5.0 "}
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!24 = !{i1 false}
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!25 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11)
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!26 = !DILocation(line: 14, scope: !4)
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!27 = !DILocation(line: 5, scope: !14, inlinedAt: !26)
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!28 = !DILocation(line: 10, scope: !14, inlinedAt: !26)
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!29 = !DILocation(line: 15, scope: !4)
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!30 = !DILocation(line: 17, scope: !8)
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!31 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11)
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!32 = !DILocation(line: 18, scope: !8)
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!33 = !DILocation(line: 5, scope: !14, inlinedAt: !32)
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!34 = !DILocation(line: 6, scope: !19, inlinedAt: !32)
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!35 = !DILocation(line: 7, scope: !18, inlinedAt: !32)
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!36 = !{!37, !37, i64 0}
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!37 = !{!"int", !38, i64 0}
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!38 = !{!"omnipotent char", !39, i64 0}
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!39 = !{!"Simple C/C++ TBAA"}
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!40 = !DILocalVariable(name: "s", line: 7, scope: !18, file: !5, type: !20)
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!41 = !DILocation(line: 8, scope: !18, inlinedAt: !32)
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!42 = !DILocation(line: 9, scope: !18, inlinedAt: !32)
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!43 = !DILocation(line: 10, scope: !14, inlinedAt: !32)
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!44 = !DILocation(line: 19, scope: !8)
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