2c864551df
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
88 lines
4.2 KiB
LLVM
88 lines
4.2 KiB
LLVM
; RUN: llc < %s -O1 -stop-after=livedebugvalues -o - | FileCheck %s
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; This ll-file was created by:
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; clang --target=powerpc-apple-darwin9 -O1 -S -g -emit-llvm debuginfo-stackarg.c
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;
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; with debuginfo-stackarg.c being the program:
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; long long foo(long long bar1, long long bar2, long long bar3, long long bar4, long long bar5)
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; {
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; return bar1 + bar2 + bar3 + bar4 + bar5;
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; }
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; ModuleID = 'debuginfo-stackarg.c'
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source_filename = "debuginfo-stackarg.c"
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target datalayout = "E-m:o-p:32:32-f64:32:64-n32"
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target triple = "powerpc-apple-macosx10.5.0"
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; Function Attrs: nounwind readnone ssp uwtable
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define i64 @foo(i64 %bar1, i64 %bar2, i64 %bar3, i64 %bar4, i64 %bar5) local_unnamed_addr #0 !dbg !8 {
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; Variable bar5 should be associated with a position on the stack (offset relative r1).
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; Let's verify that we point out the start address (lowest address).
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;
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; First find the metadata id for bar5.
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; CHECK: !17 = !DILocalVariable(name: "bar5", arg: 5
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;
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; Now check that we got two entries on the fixed stack with "expected" offsets.
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; CHECK-LABEL: fixedStack:
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; CHECK: id: 0, type: default, offset: 60, size: 4
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; CHECK: id: 1, type: default, offset: 56, size: 4
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; CHECK-NOT: id: 2
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; CHECK-LABEL: stack:
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;
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; Finally check the resulting function body.
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; We expect to find a DBG_VALUE refering to the metadata id for bar5, using the lowest
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; of the two fixed stack offsets found earlier.
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; CHECK-LABEL: body:
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; CHECK: DBG_VALUE $r1, 0, !17, !DIExpression(DW_OP_plus_uconst, 56)
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entry:
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tail call void @llvm.dbg.value(metadata i64 %bar1, metadata !13, metadata !DIExpression()), !dbg !18
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tail call void @llvm.dbg.value(metadata i64 %bar2, metadata !14, metadata !DIExpression()), !dbg !19
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tail call void @llvm.dbg.value(metadata i64 %bar3, metadata !15, metadata !DIExpression()), !dbg !20
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tail call void @llvm.dbg.value(metadata i64 %bar4, metadata !16, metadata !DIExpression()), !dbg !21
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tail call void @llvm.dbg.value(metadata i64 %bar5, metadata !17, metadata !DIExpression()), !dbg !22
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%add = add nsw i64 %bar2, %bar1, !dbg !23
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%add1 = add nsw i64 %add, %bar3, !dbg !24
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%add2 = add nsw i64 %add1, %bar4, !dbg !25
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%add3 = add nsw i64 %add2, %bar5, !dbg !26
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ret i64 %add3, !dbg !27
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind readnone ssp uwtable }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "debuginfo-stackarg.c", directory: "/repo")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 2}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!"clang version 6.0.0"}
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!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
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!9 = !DISubroutineType(types: !10)
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!10 = !{!11, !11, !11, !11, !11, !11}
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!11 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
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!12 = !{!13, !14, !15, !16, !17}
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!13 = !DILocalVariable(name: "bar1", arg: 1, scope: !8, file: !1, line: 1, type: !11)
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!14 = !DILocalVariable(name: "bar2", arg: 2, scope: !8, file: !1, line: 1, type: !11)
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!15 = !DILocalVariable(name: "bar3", arg: 3, scope: !8, file: !1, line: 1, type: !11)
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!16 = !DILocalVariable(name: "bar4", arg: 4, scope: !8, file: !1, line: 1, type: !11)
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!17 = !DILocalVariable(name: "bar5", arg: 5, scope: !8, file: !1, line: 1, type: !11)
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!18 = !DILocation(line: 1, column: 25, scope: !8)
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!19 = !DILocation(line: 1, column: 41, scope: !8)
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!20 = !DILocation(line: 1, column: 57, scope: !8)
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!21 = !DILocation(line: 1, column: 73, scope: !8)
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!22 = !DILocation(line: 1, column: 89, scope: !8)
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!23 = !DILocation(line: 3, column: 15, scope: !8)
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!24 = !DILocation(line: 3, column: 22, scope: !8)
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!25 = !DILocation(line: 3, column: 29, scope: !8)
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!26 = !DILocation(line: 3, column: 36, scope: !8)
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!27 = !DILocation(line: 3, column: 3, scope: !8)
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