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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
105 lines
5.2 KiB
LLVM
105 lines
5.2 KiB
LLVM
; REQUIRES: object-emission
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; RUN: llc -mtriple=x86_64-apple-macosx10.10.0 -o %t %s
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; Testcase generated from:
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; #include <stdint.h>
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; int foo(int a) {
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; int b = (int16_t)a + 8;
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; int c = (int16_t)b + 8;
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; int d = (int16_t)c + 8;
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; int e = (int16_t)d + 8;
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; int f = (int16_t)e + 8;
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; return f;
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; }
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; by emitting the IR and then manually applying mem2reg to it.
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; This testcase would trigger the assert commited along with it if the
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; fix of r221709 isn't applied. There is no other check except the successful
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; run of llc.
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; What happened before r221709, is that SDDbgInfo (the data structure helping
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; SelectionDAG to keep track of dbg.values) kept a map keyed by SDNode pointers.
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; This map was never purged when the SDNodes were deallocated and thus if a new
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; SDNode was allocated in the same memory, it would have an entry in the SDDbgInfo
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; map upon creation (Reallocation in the same memory can happen easily as
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; SelectionDAG uses a Recycling allocator). This behavior could turn into a
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; pathological memory consumption explosion if the DAG combiner hit the 'right'
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; allocation patterns as could be seen in PR20893.
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; By nature, this test could bitrot quite easily. If it doesn't trigger an assert
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; when run with r221709 reverted, then it really doesn't test anything anymore.
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; Function Attrs: nounwind ssp uwtable
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define i32 @foo(i32 %a) #0 !dbg !8 {
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entry:
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call void @llvm.dbg.value(metadata i32 %a, metadata !16, metadata !17), !dbg !18
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%conv = trunc i32 %a to i16, !dbg !19
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%conv1 = sext i16 %conv to i32, !dbg !19
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%add = add nsw i32 %conv1, 8, !dbg !19
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call void @llvm.dbg.value(metadata i32 %add, metadata !20, metadata !17), !dbg !21
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%conv2 = trunc i32 %add to i16, !dbg !22
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%conv3 = sext i16 %conv2 to i32, !dbg !22
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%add4 = add nsw i32 %conv3, 8, !dbg !22
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call void @llvm.dbg.value(metadata i32 %add4, metadata !23, metadata !17), !dbg !24
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%conv5 = trunc i32 %add4 to i16, !dbg !25
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%conv6 = sext i16 %conv5 to i32, !dbg !25
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%add7 = add nsw i32 %conv6, 8, !dbg !25
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call void @llvm.dbg.value(metadata i32 %add7, metadata !26, metadata !17), !dbg !27
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%conv8 = trunc i32 %add7 to i16, !dbg !28
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%conv9 = sext i16 %conv8 to i32, !dbg !28
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%add10 = add nsw i32 %conv9, 8, !dbg !28
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call void @llvm.dbg.value(metadata i32 %add10, metadata !29, metadata !17), !dbg !30
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%conv11 = trunc i32 %add10 to i16, !dbg !31
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%conv12 = sext i16 %conv11 to i32, !dbg !31
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%add13 = add nsw i32 %conv12, 8, !dbg !31
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call void @llvm.dbg.value(metadata i32 %add13, metadata !32, metadata !17), !dbg !33
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ret i32 %add13, !dbg !34
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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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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind ssp uwtable "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "ghost-sdnode-dbgvalues.c", directory: "/tmp")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIDerivedType(tag: DW_TAG_typedef, name: "int16_t", line: 30, file: !5, baseType: !6)
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!5 = !DIFile(filename: "/usr/include/sys/_types/_int16_t.h", directory: "/tmp")
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "short", size: 16, align: 16, encoding: DW_ATE_signed)
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!8 = distinct !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !9, type: !10, retainedNodes: !2)
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!9 = !DIFile(filename: "ghost-sdnode-dbgvalues.c", directory: "/tmp")
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!10 = !DISubroutineType(types: !11)
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!11 = !{!12, !12}
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!12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !{i32 2, !"Dwarf Version", i32 2}
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = !{!"clang version 3.6.0 "}
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!16 = !DILocalVariable(name: "a", line: 3, arg: 1, scope: !8, file: !9, type: !12)
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!17 = !DIExpression()
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!18 = !DILocation(line: 3, column: 13, scope: !8)
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!19 = !DILocation(line: 4, column: 5, scope: !8)
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!20 = !DILocalVariable(name: "b", line: 4, scope: !8, file: !9, type: !12)
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!21 = !DILocation(line: 4, column: 9, scope: !8)
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!22 = !DILocation(line: 5, column: 5, scope: !8)
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!23 = !DILocalVariable(name: "c", line: 5, scope: !8, file: !9, type: !12)
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!24 = !DILocation(line: 5, column: 9, scope: !8)
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!25 = !DILocation(line: 6, column: 5, scope: !8)
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!26 = !DILocalVariable(name: "d", line: 6, scope: !8, file: !9, type: !12)
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!27 = !DILocation(line: 6, column: 9, scope: !8)
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!28 = !DILocation(line: 7, column: 5, scope: !8)
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!29 = !DILocalVariable(name: "e", line: 7, scope: !8, file: !9, type: !12)
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!30 = !DILocation(line: 7, column: 9, scope: !8)
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!31 = !DILocation(line: 8, column: 5, scope: !8)
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!32 = !DILocalVariable(name: "f", line: 8, scope: !8, file: !9, type: !12)
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!33 = !DILocation(line: 8, column: 9, scope: !8)
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!34 = !DILocation(line: 9, column: 5, scope: !8)
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