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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
75 lines
3.4 KiB
LLVM
75 lines
3.4 KiB
LLVM
; DWARF linkage name attributes are optional; verify they are missing for
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; PS4 triple or when tuning for SCE.
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; RUN: llc -O0 -mtriple=x86_64-unknown-unknown < %s | FileCheck %s -check-prefix LINKAGE1
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; RUN: llc -O0 -mtriple=x86_64-unknown-unknown < %s | FileCheck %s -check-prefix LINKAGE2
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; RUN: llc -O0 -mtriple=x86_64-scei-ps4 < %s | FileCheck %s -check-prefix NOLINKAGE
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; RUN: llc -O0 -mtriple=x86_64-unknown-unknown -debugger-tune=sce < %s | FileCheck %s -check-prefix NOLINKAGE
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; $ clang++ -emit-llvm -S -g dwarf-linkage-names.cpp
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; namespace test {
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; int global_var;
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; int bar() { return global_var; }
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;};
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; With linkage names, we get an attribute for the declaration (first) entry
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; for the global variable, and one for the function.
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; This assumes the variable will appear before the function.
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; LINKAGE1: .section .debug_info
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; LINKAGE1: DW_TAG_variable
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; LINKAGE1-NOT: DW_TAG
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; LINKAGE1: {{DW_AT_(MIPS_)?linkage_name}}
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; LINKAGE1: DW_TAG_subprogram
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; LINKAGE1-NOT: DW_TAG
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; LINKAGE1: {{DW_AT_(MIPS_)?linkage_name}}
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; LINKAGE1: .section
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; Also verify we see the mangled names. We do this as a separate pass to
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; avoid depending on the order of .debug_info and .debug_str sections.
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; LINKAGE2-DAG: .asciz "_ZN4test10global_varE"
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; LINKAGE2-DAG: .asciz "_ZN4test3barEv"
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; Without linkage names, verify there aren't any linkage-name attributes,
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; and no mangled names.
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; NOLINKAGE-NOT: {{DW_AT_(MIPS_)?linkage_name}}
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; NOLINKAGE-NOT: .asciz "_ZN4test10global_varE"
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; NOLINKAGE-NOT: .asciz "_ZN4test3barEv"
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source_filename = "test/DebugInfo/X86/dwarf-linkage-names.ll"
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@_ZN4test10global_varE = global i32 0, align 4, !dbg !0
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; Function Attrs: nounwind uwtable
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define i32 @_ZN4test3barEv() #0 !dbg !11 {
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entry:
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%0 = load i32, i32* @_ZN4test10global_varE, align 4, !dbg !14
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ret i32 %0, !dbg !15
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}
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attributes #0 = { nounwind uwtable "disable-tail-calls"="false" "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" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!5}
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!llvm.module.flags = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = !DIGlobalVariable(name: "global_var", linkageName: "_ZN4test10global_varE", scope: !2, file: !3, line: 2, type: !4, isLocal: false, isDefinition: true)
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!2 = !DINamespace(name: "test", scope: null)
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!3 = !DIFile(filename: "dwarf-linkage-names.cpp", directory: "/home/probinson/projects/scratch")
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!4 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 3.8.0 (trunk 244662)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !6, globals: !7)
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!6 = !{}
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!7 = !{!0}
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 3.8.0 (trunk 244662)"}
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!11 = distinct !DISubprogram(name: "bar", linkageName: "_ZN4test3barEv", scope: !2, file: !3, line: 3, type: !12, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !5, retainedNodes: !6)
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!12 = !DISubroutineType(types: !13)
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!13 = !{!4}
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!14 = !DILocation(line: 3, column: 21, scope: !11)
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!15 = !DILocation(line: 3, column: 14, scope: !11)
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