2018-02-09 22:03:26 +08:00
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; RUN: llc -mtriple mips64-unknown-freebsd12.0 -relocation-model pic -mcpu=mips4 -target-abi n64 -O2 -verify-machineinstrs -o - %s
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2017-10-26 18:58:36 +08:00
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; Test that the long branch pass does not crash due to the control flow
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; optimizer producing malformed basic block operands due to the backend
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; failing to handle debug information around branch instructions.
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define void @f() !dbg !5 {
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entry:
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%cmp = icmp eq i32 undef, 0, !dbg !16
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%conv = zext i1 %cmp to i32, !dbg !16
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tail call void @llvm.dbg.value(metadata i32 %conv, metadata !11, metadata !DIExpression()), !dbg !17
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%tobool = icmp eq i32 undef, 0, !dbg !18
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br i1 %tobool, label %if.end, label %cleanup7.critedge, !dbg !21
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if.end: ; preds = %entry
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%call6 = call i32 bitcast (i32 (...)* @j to i32 (i32)*)(i32 signext %conv)
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#4, !dbg !22
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br label %cleanup7, !dbg !23
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cleanup7.critedge: ; preds = %entry
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull undef) #4, !dbg !24
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br label %cleanup7
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cleanup7: ; preds = %cleanup7.critedge,
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ret void
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}
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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declare i32 @j(...)
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declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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attributes #1 = { argmemonly nounwind }
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attributes #3 = { nounwind readnone speculatable }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang
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version 6.0.0", isOptimized: true, runtimeVersion:
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0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename:
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"/tmp//<stdin>", directory:
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"/tmp/")
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!2 = !{}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 7, !"PIC Level", i32 2}
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!5 = distinct !DISubprogram(name: "f", scope: !6, file: !6, line: 8, type: !7,
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isLocal: false, isDefinition: true, scopeLine: 8, isOptimized: true, unit: !0,
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[DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label.
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
2018-05-09 10:40:45 +08:00
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retainedNodes: !10)
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2017-10-26 18:58:36 +08:00
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!6 = !DIFile(filename:
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"/tmp/test.c",
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directory: "/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9}
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !{!11, !12, !14}
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!11 = !DILocalVariable(name: "e", scope: !5, file: !6, line: 9, type: !9)
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!12 = !DILocalVariable(name: "g", scope: !13, file: !6, line: 11, type: !9)
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!13 = distinct !DILexicalBlock(scope: !5, file: !6, line: 10, column: 3)
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!14 = !DILocalVariable(name: "d", scope: !13, file: !6, line: 12, type: !15)
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!15 = !DIDerivedType(tag: DW_TAG_typedef, name: "a", file: !6, line: 2,
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baseType: !9)
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!16 = !DILocation(line: 9, column: 15, scope: !5)
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!17 = !DILocation(line: 9, column: 7, scope: !5)
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!18 = !DILocation(line: 12, column: 5, scope: !19)
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!19 = distinct !DILexicalBlock(scope: !20, file: !6, line: 12, column: 5)
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!20 = distinct !DILexicalBlock(scope: !5, file: !6, line: 10, column: 3)
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!21 = !DILocation(line: 12, column: 5, scope: !20)
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!22 = !DILocation(line: 16, column: 3, scope: !5)
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!23 = !DILocation(line: 17, column: 1, scope: !5)
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!24 = !DILocation(line: 15, column: 3, scope: !5)
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