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llvm-mirror/test/DebugInfo/duplicate_dbgvalue.ll
Alok Kumar Sharma da25965366 [DebugInfo] Avoid generating duplicate llvm.dbg.value 
Summary:
This is to avoid generating duplicate llvm.dbg.value instrinsic if it already exists after the Instruction.

Before inserting llvm.dbg.value instruction, LLVM checks if the same instruction is already present before the instruction to avoid duplicates.
Currently it misses to check if it already exists after the instruction.
flang generates IR like this.

%4 = load i32, i32* %i1_311, align 4, !dbg !42
call void @llvm.dbg.value(metadata i32 %4, metadata !35, metadata !DIExpression()), !dbg !33
When this IR is processed in llvm, it ends up inserting duplicates.
%4 = load i32, i32* %i1_311, align 4, !dbg !42
call void @llvm.dbg.value(metadata i32 %4, metadata !35, metadata !DIExpression()), !dbg !33
call void @llvm.dbg.value(metadata i32 %4, metadata !35, metadata !DIExpression()), !dbg !33
We have now updated LdStHasDebugValue to include the cases when instruction is already
followed by same dbg.value instruction we intend to insert.

Now,

Definition and usage of function LdStHasDebugValue are deleted.
RemoveRedundantDbgInstrs is called for the cleanup of duplicate dbg.value's

Testing:
Added unit test for validation
check-llvm
check-debuginfo (the debug info integration tests)

Reviewers: aprantl, probinson, dblaikie, jmorse, jini.susan.george
SouraVX, awpandey, dstenb, vsk

Reviewed By: aprantl, jmorse, dstenb, vsk

Differential Revision: https://reviews.llvm.org/D74030
2020-03-03 09:56:45 +05:30

170 lines
8.7 KiB
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; RUN: opt -instcombine -S -o - < %s | FileCheck %s
; CHECK-LABEL: %4 = load i32, i32* %i1_311
; CHECK: call void @llvm.dbg.value(metadata i32 %4
; Next instruction should not be duplicate dbg.value intrinsic.
; CHECK-NEXT: @f90io_sc_i_ldw
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;program main
;integer :: res
; res = mfun()
; print *, res
;contains
; function mfun()
; integer :: i1
; i1 = 5
; mfun = fun(i1)
; write (*,*) i1
; end function
; function fun(a)
; integer, intent (in) :: a
; fun = a
; end function
;end program main
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; ModuleID = 'duplicate_dbgvalue.ll'
source_filename = "duplicate_dbgvalue.ll"
target datalayout = "e-p:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%struct.BSS1 = type <{ [4 x i8] }>
@.BSS1 = internal unnamed_addr global %struct.BSS1 zeroinitializer, align 32, !dbg !0
@.C303_MAIN_ = internal constant i32 6
@.C300_MAIN_ = internal constant [22 x i8] c"duplicate_dbgvalue.f90"
@.C302_MAIN_ = internal constant i32 4
@.C283_MAIN_ = internal constant i32 0
@.C283_main_mfun = internal constant i32 0
@.C302_main_mfun = internal constant i32 6
@.C300_main_mfun = internal constant [22 x i8] c"duplicate_dbgvalue.f90"
@.C313_main_mfun = internal constant i32 10
define void @MAIN_() local_unnamed_addr !dbg !2 {
L.entry:
call void (i8*, ...) bitcast (void (...)* @fort_init to void (i8*, ...)*)(i8* bitcast (i32* @.C283_MAIN_ to i8*)), !dbg !16
%0 = call fastcc i32 @main_mfun(), !dbg !18
store i32 %0, i32* bitcast (%struct.BSS1* @.BSS1 to i32*), align 32, !dbg !18
call void (i8*, i8*, i64, ...) bitcast (void (...)* @f90io_src_info03a to void (i8*, i8*, i64, ...)*)(i8* bitcast (i32* @.C302_MAIN_ to i8*), i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.C300_MAIN_, i64 0, i64 0), i64 22), !dbg !23
%1 = call i32 (i8*, i8*, i8*, i8*, ...) bitcast (i32 (...)* @f90io_print_init to i32 (i8*, i8*, i8*, i8*, ...)*)(i8* bitcast (i32* @.C303_MAIN_ to i8*), i8* null, i8* bitcast (i32* @.C283_MAIN_ to i8*), i8* bitcast (i32* @.C283_MAIN_ to i8*)), !dbg !23
call void @llvm.dbg.value(metadata i32 %1, metadata !24, metadata !DIExpression()), !dbg !25
%2 = load i32, i32* bitcast (%struct.BSS1* @.BSS1 to i32*), align 32, !dbg !23
%3 = call i32 (i32, i32, ...) bitcast (i32 (...)* @f90io_sc_i_ldw to i32 (i32, i32, ...)*)(i32 %2, i32 25), !dbg !23
call void @llvm.dbg.value(metadata i32 %3, metadata !24, metadata !DIExpression()), !dbg !25
%4 = call i32 (...) @f90io_ldw_end(), !dbg !23
call void @llvm.dbg.value(metadata i32 %4, metadata !24, metadata !DIExpression()), !dbg !25
ret void, !dbg !26
}
define internal fastcc signext i32 @main_mfun() unnamed_addr !dbg !27 {
L.entry:
%i1_311 = alloca i32, align 4
call void @llvm.dbg.declare(metadata i64* undef, metadata !31, metadata !DIExpression()), !dbg !33
call void @llvm.dbg.declare(metadata i32* %i1_311, metadata !35, metadata !DIExpression()), !dbg !33
store i32 5, i32* %i1_311, align 4, !dbg !36
%0 = bitcast i32* %i1_311 to i64*, !dbg !41
%1 = call fastcc float @main_fun(i64* %0), !dbg !41
%2 = fptosi float %1 to i32, !dbg !41
call void (i8*, i8*, i64, ...) bitcast (void (...)* @f90io_src_info03a to void (i8*, i8*, i64, ...)*)(i8* bitcast (i32* @.C313_main_mfun to i8*), i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.C300_main_mfun, i32 0, i32 0), i64 22), !dbg !42
%3 = call i32 (i8*, i8*, i8*, i8*, ...) bitcast (i32 (...)* @f90io_print_init to i32 (i8*, i8*, i8*, i8*, ...)*)(i8* bitcast (i32* @.C302_main_mfun to i8*), i8* null, i8* bitcast (i32* @.C283_main_mfun to i8*), i8* bitcast (i32* @.C283_main_mfun to i8*)), !dbg !42
call void @llvm.dbg.value(metadata i32 %3, metadata !43, metadata !DIExpression()), !dbg !33
%4 = load i32, i32* %i1_311, align 4, !dbg !42
call void @llvm.dbg.value(metadata i32 %4, metadata !35, metadata !DIExpression()), !dbg !33
%5 = call i32 (i32, i32, ...) bitcast (i32 (...)* @f90io_sc_i_ldw to i32 (i32, i32, ...)*)(i32 %4, i32 25), !dbg !42
call void @llvm.dbg.value(metadata i32 %5, metadata !43, metadata !DIExpression()), !dbg !33
%6 = call i32 (...) @f90io_ldw_end(), !dbg !42
call void @llvm.dbg.value(metadata i32 %6, metadata !43, metadata !DIExpression()), !dbg !33
ret i32 %2, !dbg !44
}
define internal fastcc float @main_fun(i64* noalias %a) unnamed_addr !dbg !45 {
L.entry:
call void @llvm.dbg.declare(metadata i64* %a, metadata !50, metadata !DIExpression()), !dbg !51
call void @llvm.dbg.declare(metadata i64* undef, metadata !53, metadata !DIExpression()), !dbg !51
%0 = bitcast i64* %a to i32*, !dbg !54
%1 = load i32, i32* %0, align 4, !dbg !54
%2 = sitofp i32 %1 to float, !dbg !54
ret float %2, !dbg !59
}
declare signext i32 @f90io_ldw_end(...) local_unnamed_addr
declare signext i32 @f90io_sc_i_ldw(...) local_unnamed_addr
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.declare(metadata, metadata, metadata)
declare signext i32 @f90io_print_init(...) local_unnamed_addr
declare void @f90io_src_info03a(...) local_unnamed_addr
declare void @fort_init(...) local_unnamed_addr
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.module.flags = !{!14, !15}
!llvm.dbg.cu = !{!4}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "res", scope: !2, file: !3, type: !9, isLocal: true, isDefinition: true)
!2 = distinct !DISubprogram(name: "main", scope: !4, file: !3, line: 1, type: !12, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagMainSubprogram, unit: !4)
!3 = !DIFile(filename: "duplicate-dbgvalue.f90", directory: "/dir")
!4 = distinct !DICompileUnit(language: DW_LANG_Fortran90, file: !3, producer: " F90 Flang - 1.5", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !5, retainedTypes: !5, globals: !6, imports: !5)
!5 = !{}
!6 = !{!0, !7, !10}
!7 = !DIGlobalVariableExpression(var: !8, expr: !DIExpression())
!8 = distinct !DIGlobalVariable(name: "res", scope: !4, file: !3, type: !9, isLocal: true, isDefinition: true)
!9 = !DIBasicType(name: "integer", size: 32, align: 32, encoding: DW_ATE_signed)
!10 = !DIGlobalVariableExpression(var: !11, expr: !DIExpression())
!11 = distinct !DIGlobalVariable(name: "res", scope: !4, file: !3, type: !9, isLocal: true, isDefinition: true)
!12 = !DISubroutineType(cc: DW_CC_program, types: !13)
!13 = !{null}
!14 = !{i32 2, !"Dwarf Version", i32 4}
!15 = !{i32 2, !"Debug Info Version", i32 3}
!16 = !DILocation(line: 1, column: 1, scope: !17)
!17 = !DILexicalBlock(scope: !2, file: !3, line: 1, column: 1)
!18 = !DILocation(line: 3, column: 1, scope: !17)
!19 = !{!20, !20, i64 0}
!20 = !{!"t1.2", !21, i64 0}
!21 = !{!"unlimited ptr", !22, i64 0}
!22 = !{!"Flang FAA 1"}
!23 = !DILocation(line: 4, column: 1, scope: !17)
!24 = !DILocalVariable(scope: !17, file: !3, type: !9, flags: DIFlagArtificial)
!25 = !DILocation(line: 0, scope: !17)
!26 = !DILocation(line: 5, column: 1, scope: !17)
!27 = distinct !DISubprogram(name: "mfun", scope: !2, file: !3, line: 6, type: !28, scopeLine: 6, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition, unit: !4)
!28 = !DISubroutineType(types: !29)
!29 = !{!30}
!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64, align: 64)
!31 = !DILocalVariable(arg: 1, scope: !27, file: !3, type: !32, flags: DIFlagArtificial)
!32 = !DIBasicType(name: "uinteger*8", size: 64, align: 64, encoding: DW_ATE_unsigned)
!33 = !DILocation(line: 0, scope: !34)
!34 = !DILexicalBlock(scope: !27, file: !3, line: 6, column: 1)
!35 = !DILocalVariable(name: "i1", scope: !34, file: !3, type: !9)
!36 = !DILocation(line: 8, column: 1, scope: !34)
!37 = !{!38, !38, i64 0}
!38 = !{!"t2.2", !39, i64 0}
!39 = !{!"unlimited ptr", !40, i64 0}
!40 = !{!"Flang FAA 2"}
!41 = !DILocation(line: 9, column: 1, scope: !34)
!42 = !DILocation(line: 10, column: 1, scope: !34)
!43 = !DILocalVariable(scope: !34, file: !3, type: !9, flags: DIFlagArtificial)
!44 = !DILocation(line: 11, column: 1, scope: !34)
!45 = distinct !DISubprogram(name: "fun", scope: !2, file: !3, line: 12, type: !46, scopeLine: 12, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition, unit: !4)
!46 = !DISubroutineType(types: !47)
!47 = !{!48, !9}
!48 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !49, size: 64, align: 64)
!49 = !DIBasicType(name: "real", size: 32, align: 32, encoding: DW_ATE_float)
!50 = !DILocalVariable(name: "a", arg: 1, scope: !45, file: !3, type: !9)
!51 = !DILocation(line: 0, scope: !52)
!52 = !DILexicalBlock(scope: !45, file: !3, line: 12, column: 1)
!53 = !DILocalVariable(arg: 2, scope: !45, file: !3, type: !32, flags: DIFlagArtificial)
!54 = !DILocation(line: 14, column: 1, scope: !52)
!55 = !{!56, !56, i64 0}
!56 = !{!"t3.2", !57, i64 0}
!57 = !{!"unlimited ptr", !58, i64 0}
!58 = !{!"Flang FAA 3"}
!59 = !DILocation(line: 15, column: 1, scope: !52)
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