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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
106 lines
4.3 KiB
LLVM
106 lines
4.3 KiB
LLVM
; RUN: llc < %s -filetype=obj | llvm-dwarfdump -v - --debug-info | FileCheck %s
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;
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; IR module created as follows:
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; clang -emit-llvm -S db-abs-1.cpp -o db-abs-1.ll -g
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; clang -emit-llvm -S db-abs-2.cpp -o db-abs-2.ll -gmlt
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; llvm-link db-abs-1.ll db-abs-2.ll -S -o db-abs-3.ll
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; --- db-abs-1.cpp ---
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; void f1();
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; inline __attribute__((always_inline)) void f2(int) {
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; f1();
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; }
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; void f3() {
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; f2(0);
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; }
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; --- db-abs-2.cpp ---
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; void f() {
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; }
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; ---
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; The point is that f3() is compiled -g and we get an abstract variable for the
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; unnamed parameter to f2(); then f() is compiled -gmlt and it's okay to have
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; the abstract variable still there.
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; PR31437.
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;
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; (The 'always_inline' attribute forces f2() to be inlined even at -O0, the
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; 'inline' keyword means the non-inlined definition of f2() can be omitted from
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; the IR. These are just tactics to simplify the generated test case.)
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;
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; Verify we see the formal parameter in the first compile-unit, and nothing in
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; the second compile-unit.
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;
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; CHECK: DW_TAG_compile_unit
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "db-abs-1.cpp"
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; CHECK-NOT: NULL
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; CHECK: DW_TAG_subprogram
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; CHECK-NEXT: DW_AT_linkage_name {{.*}} "_Z2f2i"
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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_AT_name
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; CHECK: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_inlined_subroutine
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; CHECK-NEXT: DW_AT_abstract_origin {{.*}} "_Z2f2i"
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; CHECK: DW_TAG_compile_unit
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; CHECK-NOT: DW_TAG
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; ModuleID = 'llvm-link'
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source_filename = "llvm-link"
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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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; Function Attrs: noinline uwtable
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define void @_Z2f3v() #0 !dbg !8 {
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entry:
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%.addr.i = alloca i32, align 4
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call void @llvm.dbg.declare(metadata i32* %.addr.i, metadata !11, metadata !16), !dbg !17
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store i32 0, i32* %.addr.i, align 4
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call void @_Z2f1v(), !dbg !19
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ret void, !dbg !20
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare void @_Z2f1v() #2
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; Function Attrs: noinline nounwind uwtable
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define void @_Z1fv() #3 !dbg !21 {
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entry:
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ret void, !dbg !23
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}
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attributes #0 = { noinline uwtable }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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attributes #3 = { noinline nounwind uwtable }
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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 293745)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "db-abs-1.cpp", directory: "/home/probinson/projects/scratch/pr31437")
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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 293745)", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
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!4 = !DIFile(filename: "db-abs-2.cpp", directory: "/home/probinson/projects/scratch/pr31437")
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!5 = !{!"clang version 5.0.0 (trunk 293745)"}
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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: "f3", linkageName: "_Z2f3v", scope: !1, file: !1, line: 5, type: !9, isLocal: false, isDefinition: true, scopeLine: 5, 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 = !DILocalVariable(arg: 1, scope: !12, file: !1, line: 2, type: !15)
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!12 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2i", scope: !1, file: !1, line: 2, type: !13, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!13 = !DISubroutineType(types: !14)
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!14 = !{null, !15}
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!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!16 = !DIExpression()
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!17 = !DILocation(line: 2, column: 50, scope: !12, inlinedAt: !18)
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!18 = distinct !DILocation(line: 6, column: 3, scope: !8)
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!19 = !DILocation(line: 3, column: 3, scope: !12, inlinedAt: !18)
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!20 = !DILocation(line: 7, column: 1, scope: !8)
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!21 = distinct !DISubprogram(name: "f", scope: !4, file: !4, line: 1, type: !22, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !3, retainedNodes: !2)
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!22 = !DISubroutineType(types: !2)
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!23 = !DILocation(line: 2, column: 1, scope: !21)
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