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llvm-project/llvm/test/CodeGen/Mips/pr34975.ll

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[DebugInfo] Don't insert DEBUG_VALUE after terminators r314974 introduced insertion of DEBUG_VALUEs after each redefinition of debug value register in the slot index range. In case the instruction redefining the debug value register was a terminator, machine verifier would complain since it enforces the rule of no non-terminator instructions following the first terminator. Differential Revision: https://reviews.llvm.org/D42801 llvm-svn: 324734
2018-02-09 22:03:26 +08:00
; RUN: llc -mtriple=mips64-unknown-freebsd -target-abi n64 -relocation-model pic -verify-machineinstrs -o /dev/null %s -O2
[mips] Fix analyzeBranch to handle debug data In the case where there was a conditional branch followed by a unconditional branch with debug instruction separating them, MipsInstrInfo::analyzeBranch would not skip past debug instruction when searching for the second branch which give erroneous results about the control flow of the block. This could lead to the branch folder to merge the non-fall through case into it's predecessor, leaving the conditional branch with a dangling basic block operand. This resolves PR34975. Thanks to Alexander Richardson for reporting the issue! Reviewers: atanasyan Differential Revision: https://reviews.llvm.org/D39003 llvm-svn: 316084
2017-10-18 22:35:29 +08:00
; Test that the presence of debug information does not cause the branch folder
; to rewrite branches to have negative basic block ids, which would cause the
; long branch pass to crash.
@c = external global i32, align 4
define void @e() !dbg !19 {
entry:
%0 = load i32, i32* @c, align 4, !dbg !28, !tbaa !31
%tobool8 = icmp eq i32 %0, 0, !dbg !35
br i1 %tobool8, label %for.end, label %for.body.preheader, !dbg !35
for.body.preheader: ; preds = %entry
br label %for.body, !dbg !36
for.body: ; preds = %for.body.preheader
%1 = load i8, i8* undef, align 1, !dbg !36, !tbaa !38
%conv = zext i8 %1 to i32, !dbg !36
%cmp = icmp sgt i32 %0, %conv, !dbg !39
br i1 %cmp, label %if.end, label %if.then, !dbg !40
if.then: ; preds = %for.body
tail call void @llvm.dbg.value(metadata i32 %conv, metadata !41, metadata !DIExpression()), !dbg !43
%idxprom5 = zext i8 %1 to i64, !dbg !44
%call = tail call i32 bitcast (i32 (...)* @g to i32 (i32)*)(i32 signext undef) #3, !dbg !45
br label %if.end, !dbg !46
if.end: ; preds = %if.then, %for.body
unreachable
for.end: ; preds = %entry
ret void
}
declare i32 @g(...)
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!17, !18}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
!1 = !DIFile(filename: "/local/scratch/alr48/cheri/llvm/tools/clang/test/CodeGen/<stdin>", directory: "/local/scratch/alr48/cheri/llvm/cmake-build-debug/tools/clang/test/CodeGen")
!2 = !{}
!3 = !{!4, !9, !13, !15}
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
!5 = distinct !DIGlobalVariable(name: "a", scope: !0, file: !6, line: 6, type: !7, isLocal: false, isDefinition: true)
!6 = !DIFile(filename: "/crash.c", directory: "/tmp")
!7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
!8 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
!10 = distinct !DIGlobalVariable(name: "b", scope: !0, file: !6, line: 7, type: !11, isLocal: false, isDefinition: true)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !DIGlobalVariableExpression(var: !14, expr: !DIExpression())
!14 = distinct !DIGlobalVariable(name: "c", scope: !0, file: !6, line: 8, type: !12, isLocal: false, isDefinition: true)
!15 = !DIGlobalVariableExpression(var: !16, expr: !DIExpression())
!16 = distinct !DIGlobalVariable(name: "d", scope: !0, file: !6, line: 8, type: !12, isLocal: false, isDefinition: true)
!17 = !{i32 2, !"Debug Info Version", i32 3}
!18 = !{i32 7, !"PIC Level", i32 2}
[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
!19 = distinct !DISubprogram(name: "e", scope: !6, file: !6, line: 9, type: !20, isLocal: false, isDefinition: true, scopeLine: 9, isOptimized: true, unit: !0, retainedNodes: !22)
[mips] Fix analyzeBranch to handle debug data In the case where there was a conditional branch followed by a unconditional branch with debug instruction separating them, MipsInstrInfo::analyzeBranch would not skip past debug instruction when searching for the second branch which give erroneous results about the control flow of the block. This could lead to the branch folder to merge the non-fall through case into it's predecessor, leaving the conditional branch with a dangling basic block operand. This resolves PR34975. Thanks to Alexander Richardson for reporting the issue! Reviewers: atanasyan Differential Revision: https://reviews.llvm.org/D39003 llvm-svn: 316084
2017-10-18 22:35:29 +08:00
!20 = !DISubroutineType(types: !21)
!21 = !{!12}
!22 = !{!23}
!23 = !DILocalVariable(name: "f", scope: !24, file: !6, line: 12, type: !12)
!24 = distinct !DILexicalBlock(scope: !25, file: !6, line: 11, column: 20)
!25 = distinct !DILexicalBlock(scope: !26, file: !6, line: 11, column: 9)
!26 = distinct !DILexicalBlock(scope: !27, file: !6, line: 10, column: 3)
!27 = distinct !DILexicalBlock(scope: !19, file: !6, line: 10, column: 3)
!28 = !DILocation(line: 10, column: 10, scope: !29)
!29 = distinct !DILexicalBlock(scope: !30, file: !6, line: 10, column: 3)
!30 = distinct !DILexicalBlock(scope: !19, file: !6, line: 10, column: 3)
!31 = !{!32, !32, i64 0}
!32 = !{!"int", !33, i64 0}
!33 = !{!"omnipotent char", !34, i64 0}
!34 = !{!"Simple C/C++ TBAA"}
!35 = !DILocation(line: 10, column: 3, scope: !30)
!36 = !DILocation(line: 11, column: 9, scope: !37)
!37 = distinct !DILexicalBlock(scope: !29, file: !6, line: 11, column: 9)
!38 = !{!33, !33, i64 0}
!39 = !DILocation(line: 11, column: 14, scope: !37)
!40 = !DILocation(line: 11, column: 9, scope: !29)
!41 = !DILocalVariable(name: "f", scope: !42, file: !6, line: 12, type: !12)
!42 = distinct !DILexicalBlock(scope: !37, file: !6, line: 11, column: 20)
!43 = !DILocation(line: 12, column: 11, scope: !42)
!44 = !DILocation(line: 13, column: 9, scope: !42)
!45 = !DILocation(line: 13, column: 7, scope: !42)
!46 = !DILocation(line: 14, column: 5, scope: !42)