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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
81 lines
3.6 KiB
LLVM
81 lines
3.6 KiB
LLVM
; REQUIRES: object-emission
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; This test is failing for powerpc64, because a location list for the
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; variable 'c' is not generated at all. Temporary marking this test as XFAIL
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; for powerpc, until PR21881 is fixed.
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; XFAIL: powerpc64
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; RUN: %llc_dwarf -O2 -dwarf-version 2 -filetype=obj < %s | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF23
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; RUN: %llc_dwarf -O2 -dwarf-version 3 -filetype=obj < %s | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF23
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; RUN: %llc_dwarf -O2 -dwarf-version 4 -filetype=obj < %s | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF4
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; This is a test for PR21176.
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; DW_OP_const <const> doesn't describe a constant value, but a value at a constant address.
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; The proper way to describe a constant value is DW_OP_constu <const>, DW_OP_stack_value.
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; Generated with clang -S -emit-llvm -g -O2 test.cpp
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; extern int func();
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;
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; int main()
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; {
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; volatile int c = 13;
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; c = func();
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; return c;
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; }
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; CHECK: DW_TAG_variable
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; CHECK: DW_AT_location
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; CHECK-NOT: DW_AT
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; DWARF23: DW_OP_constu 0xd{{$}}
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; DWARF4: DW_OP_constu 0xd, DW_OP_stack_value{{$}}
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; Function Attrs: uwtable
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define i32 @main() #0 !dbg !4 {
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entry:
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%c = alloca i32, align 4
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tail call void @llvm.dbg.value(metadata i32 13, metadata !10, metadata !16), !dbg !17
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store volatile i32 13, i32* %c, align 4, !dbg !18
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%call = tail call i32 @_Z4funcv(), !dbg !19
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tail call void @llvm.dbg.value(metadata i32 %call, metadata !10, metadata !16), !dbg !17
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store volatile i32 %call, i32* %c, align 4, !dbg !19
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tail call void @llvm.dbg.value(metadata i32* %c, metadata !10, metadata !21), !dbg !17
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%c.0.c.0. = load volatile i32, i32* %c, align 4, !dbg !20
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ret i32 %c.0.c.0., !dbg !20
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}
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declare i32 @_Z4funcv() #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 = !{!12, !13}
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!llvm.ident = !{!14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 223522)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test.cpp", directory: "/home/kromanova/ngh/ToT_latest/llvm/test/DebugInfo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "main", line: 3, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 4, file: !1, scope: !5, type: !6, retainedNodes: !9)
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!5 = !DIFile(filename: "test.cpp", directory: "/home/kromanova/ngh/ToT_latest/llvm/test/DebugInfo")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{!10}
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!10 = !DILocalVariable(name: "c", line: 5, scope: !4, file: !5, type: !11)
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!11 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !8)
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!12 = !{i32 2, !"Dwarf Version", i32 2}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{!"clang version 3.6.0 (trunk 223522)"}
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!15 = !{i32 13}
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!16 = !DIExpression()
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!17 = !DILocation(line: 5, column: 16, scope: !4)
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!18 = !DILocation(line: 5, column: 3, scope: !4)
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!19 = !DILocation(line: 6, column: 7, scope: !4)
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!20 = !DILocation(line: 7, column: 3, scope: !4)
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!21 = !DIExpression(DW_OP_deref)
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