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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
83 lines
3.4 KiB
LLVM
83 lines
3.4 KiB
LLVM
; Test to ensure that a module containing both a NoDebug CU and one with
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; debug is handled correctly.
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; LLVM IR was generated the following way:
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; $ cat a.cpp
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; void f1();
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; __attribute__((always_inline)) void f2() {
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; f1();
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; }
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; void f3();
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; void f4() {
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; f3();
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; }
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; $ cat b.cpp
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; void f2();
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; __attribute__((always_inline)) void f3() {
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; f2();
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; }
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; $ clang++ -flto a.cpp -g -c
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; $ clang++ -flto b.cpp -Rpass=inline -c
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; $ llvm-link {a,b}.o -o - | opt -O2 - -o ab.bc
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; $ llvm-dis ab.bc
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; Ensure we can successfully generate assembly, and check that neither
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; "b.cpp" nor "f3" strings show up (which would be in the .debug_str
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; section if we had generated any lexical scopes and debug for them).
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu %s -o - | FileCheck %s
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; CHECK-NOT: .asciz "b.cpp"
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; CHECK-NOT: .asciz "f3"
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; ModuleID = 'debug_and_nodebug_CUs.bc'
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source_filename = "debug_and_nodebug_CUs.ll"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @_Z2f2v() local_unnamed_addr !dbg !8 {
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entry:
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tail call void @_Z2f1v(), !dbg !11
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ret void, !dbg !12
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}
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declare void @_Z2f1v() local_unnamed_addr
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define void @_Z2f4v() local_unnamed_addr !dbg !13 {
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entry:
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tail call void @_Z2f1v(), !dbg !14
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ret void, !dbg !19
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}
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define void @_Z2f3v() local_unnamed_addr !dbg !16 {
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entry:
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tail call void @_Z2f1v(), !dbg !20
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ret void, !dbg !22
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}
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!llvm.dbg.cu = !{!0, !3}
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!llvm.ident = !{!5, !5}
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!llvm.module.flags = !{!6, !7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 294362) (llvm/trunk 294367)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "a.cpp", directory: ".")
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!2 = !{}
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!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "clang version 5.0.0 (trunk 294362) (llvm/trunk 294367)", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!4 = !DIFile(filename: "b.cpp", directory: ".")
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!5 = !{!"clang version 5.0.0 (trunk 294362) (llvm/trunk 294367)"}
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!6 = !{i32 2, !"Dwarf Version", i32 4}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null}
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!11 = !DILocation(line: 3, column: 3, scope: !8)
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!12 = !DILocation(line: 4, column: 1, scope: !8)
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!13 = distinct !DISubprogram(name: "f4", linkageName: "_Z2f4v", scope: !1, file: !1, line: 6, type: !9, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!14 = !DILocation(line: 3, column: 3, scope: !8, inlinedAt: !15)
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!15 = distinct !DILocation(line: 3, column: 3, scope: !16, inlinedAt: !18)
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!16 = distinct !DISubprogram(name: "f3", scope: !4, file: !4, line: 2, type: !17, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !3, retainedNodes: !2)
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!17 = !DISubroutineType(types: !2)
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!18 = distinct !DILocation(line: 7, column: 3, scope: !13)
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!19 = !DILocation(line: 8, column: 1, scope: !13)
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!20 = !DILocation(line: 3, column: 3, scope: !8, inlinedAt: !21)
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!21 = distinct !DILocation(line: 3, column: 3, scope: !16)
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!22 = !DILocation(line: 4, column: 1, scope: !16)
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