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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
79 lines
3.1 KiB
LLVM
79 lines
3.1 KiB
LLVM
; RUN: llc %s -stop-after=livedebugvalues -o - | FileCheck --check-prefix=SANITY %s
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; RUN: llc < %s -filetype=obj | llvm-dwarfdump -v - | FileCheck %s
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; Test debug_loc support for floating point constants.
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;
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; Created from clang -O1:
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; void barrier();
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; void foo() {
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; float f;
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; long double ld;
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; barrier();
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; f = 3.14;
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; ld = 3.14;
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; barrier();
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; }
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;
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; SANITY: CALL{{.*}} @barrier
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; SANITY: DBG_VALUE x86_fp80 0xK4000C8F5C28F5C28F800
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; SANITY: DBG_VALUE float 0x40091EB860000000
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; SANITY: TAILJMP{{.*}} @barrier
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;
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; CHECK: .debug_info contents:
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location {{.*}} (
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; CHECK-NEXT: [0x[[START:.*]], 0x[[END:.*]]): DW_OP_constu 0xc8f5c28f5c28f800, DW_OP_piece 0x8, DW_OP_constu 0x4000, DW_OP_bit_piece 0x10 0x40)
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; CHECK-NEXT: DW_AT_name {{.*}}"ld"
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location {{.*}} (
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; CHECK-NEXT: [0x[[START]], 0x[[END]]): DW_OP_constu 0x4048f5c3)
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; CHECK-NEXT: DW_AT_name {{.*}}"f"
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source_filename = "test.c"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.11.0"
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; Function Attrs: nounwind ssp uwtable
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define void @foo() #0 !dbg !4 {
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entry:
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tail call void (...) @barrier() #3, !dbg !16
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tail call void @llvm.dbg.value(metadata float 0x40091EB860000000, metadata !8, metadata !17), !dbg !18
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tail call void @llvm.dbg.value(metadata x86_fp80 0xK4000C8F5C28F5C28F800, metadata !10, metadata !17), !dbg !19
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tail call void (...) @barrier() #3, !dbg !20
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ret void, !dbg !21
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}
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declare void @barrier(...)
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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 = { nounwind ssp uwtable }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12, !13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 265328) (llvm/trunk 265330)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "/Volumes/Data/radar/25448338")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 4, isOptimized: true, unit: !0, retainedNodes: !7)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{!8, !10}
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!8 = !DILocalVariable(name: "f", scope: !4, file: !1, line: 5, type: !9)
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!9 = !DIBasicType(name: "float", size: 32, align: 32, encoding: DW_ATE_float)
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!10 = !DILocalVariable(name: "ld", scope: !4, file: !1, line: 6, type: !11)
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!11 = !DIBasicType(name: "long double", size: 128, align: 128, encoding: DW_ATE_float)
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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 = !{i32 1, !"PIC Level", i32 2}
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!15 = !{!"clang version 3.9.0 (trunk 265328) (llvm/trunk 265330)"}
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!16 = !DILocation(line: 7, column: 3, scope: !4)
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!17 = !DIExpression()
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!18 = !DILocation(line: 5, column: 9, scope: !4)
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!19 = !DILocation(line: 6, column: 15, scope: !4)
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!20 = !DILocation(line: 10, column: 3, scope: !4)
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!21 = !DILocation(line: 11, column: 1, scope: !4)
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