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[GlobalOpt] Correctly update metadata when localizing a global. Just calling dropAllReferences leaves pointers to the ConstantExpr behind, so we would eventually crash with a null pointer dereference. Differential Revision: https://reviews.llvm.org/D32551 llvm-svn: 301575
2017-04-28 02:39:08 +08:00
; RUN: opt -S < %s -globalopt | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@_ZL1x = internal global [200 x i8]* null, align 8, !dbg !0
define i32 @main(i32 %argc, i8** %argv) norecurse !dbg !18 {
; CHECK: define i32 @main
; Make sure we localized the global.
; CHECK: alloca [200 x i8]*
; Make sure the metadata is sane. Currently, we just drop the metadata,
; so it points to nothing.
; CHECK: call void @llvm.dbg.value(metadata !2,
; CHECK: !2 = !{}
entry:
Remove the obsolete offset parameter from @llvm.dbg.value There is no situation where this rarely-used argument cannot be substituted with a DIExpression and removing it allows us to simplify the DWARF backend. Note that this patch does not yet remove any of the newly dead code. rdar://problem/33580047 Differential Revision: https://reviews.llvm.org/D35951 llvm-svn: 309426
2017-07-29 04:21:02 +08:00
call void @llvm.dbg.value(metadata i32 %argc, metadata !22, metadata !23), !dbg !24
call void @llvm.dbg.value(metadata i8** %argv, metadata !25, metadata !23), !dbg !26
[GlobalOpt] Correctly update metadata when localizing a global. Just calling dropAllReferences leaves pointers to the ConstantExpr behind, so we would eventually crash with a null pointer dereference. Differential Revision: https://reviews.llvm.org/D32551 llvm-svn: 301575
2017-04-28 02:39:08 +08:00
%arrayidx = getelementptr inbounds i8*, i8** %argv, i64 0, !dbg !27
%0 = load i8*, i8** %arrayidx, align 8, !dbg !27
%1 = bitcast i8* %0 to [200 x i8]*, !dbg !28
store [200 x i8]* %1, [200 x i8]** @_ZL1x, align 8, !dbg !29
Remove the obsolete offset parameter from @llvm.dbg.value There is no situation where this rarely-used argument cannot be substituted with a DIExpression and removing it allows us to simplify the DWARF backend. Note that this patch does not yet remove any of the newly dead code. rdar://problem/33580047 Differential Revision: https://reviews.llvm.org/D35951 llvm-svn: 309426
2017-07-29 04:21:02 +08:00
call void @llvm.dbg.value(metadata i8** bitcast ([200 x i8]** @_ZL1x to i8**), metadata !30, metadata !23), !dbg !31
[GlobalOpt] Correctly update metadata when localizing a global. Just calling dropAllReferences leaves pointers to the ConstantExpr behind, so we would eventually crash with a null pointer dereference. Differential Revision: https://reviews.llvm.org/D32551 llvm-svn: 301575
2017-04-28 02:39:08 +08:00
%2 = load i8*, i8** bitcast ([200 x i8]** @_ZL1x to i8**), align 8, !dbg !32
%3 = load i8, i8* %2, align 1, !dbg !33
%conv = sext i8 %3 to i32, !dbg !33
ret i32 %conv, !dbg !34
}
Remove the obsolete offset parameter from @llvm.dbg.value There is no situation where this rarely-used argument cannot be substituted with a DIExpression and removing it allows us to simplify the DWARF backend. Note that this patch does not yet remove any of the newly dead code. rdar://problem/33580047 Differential Revision: https://reviews.llvm.org/D35951 llvm-svn: 309426
2017-07-29 04:21:02 +08:00
declare void @llvm.dbg.value(metadata, metadata, metadata)
[GlobalOpt] Correctly update metadata when localizing a global. Just calling dropAllReferences leaves pointers to the ConstantExpr behind, so we would eventually crash with a null pointer dereference. Differential Revision: https://reviews.llvm.org/D32551 llvm-svn: 301575
2017-04-28 02:39:08 +08:00
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!15, !16}
!llvm.ident = !{!17}
Canonicalize the representation of empty an expression in DIGlobalVariableExpression This change simplifies code that has to deal with DIGlobalVariableExpression and mirrors how we treat DIExpressions in debug info intrinsics. Before this change there were two ways of representing empty expressions on globals, a nullptr and an empty !DIExpression(). If someone needs to upgrade out-of-tree testcases: perl -pi -e 's/(!DIGlobalVariableExpression\(var: ![0-9]*)\)/\1, expr: !DIExpression())/g' <MYTEST.ll> will catch 95%. llvm-svn: 312144
2017-08-31 02:06:51 +08:00
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
[GlobalOpt] Correctly update metadata when localizing a global. Just calling dropAllReferences leaves pointers to the ConstantExpr behind, so we would eventually crash with a null pointer dereference. Differential Revision: https://reviews.llvm.org/D32551 llvm-svn: 301575
2017-04-28 02:39:08 +08:00
!1 = distinct !DIGlobalVariable(name: "x", linkageName: "_ZL1x", scope: !2, file: !14, line: 1, type: !6, isLocal: true, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !13)
!3 = !DIFile(filename: "-", directory: "/")
!4 = !{}
!5 = !{!6, !11}
!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 1600, elements: !9)
!8 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!9 = !{!10}
!10 = !DISubrange(count: 200)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
!13 = !{!0}
!14 = !DIFile(filename: "<stdin>", directory: "/")
!15 = !{i32 2, !"Dwarf Version", i32 4}
!16 = !{i32 2, !"Debug Info Version", i32 3}
!17 = !{!"clang"}
[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
!18 = distinct !DISubprogram(name: "main", scope: !14, file: !14, line: 2, type: !19, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !4)
[GlobalOpt] Correctly update metadata when localizing a global. Just calling dropAllReferences leaves pointers to the ConstantExpr behind, so we would eventually crash with a null pointer dereference. Differential Revision: https://reviews.llvm.org/D32551 llvm-svn: 301575
2017-04-28 02:39:08 +08:00
!19 = !DISubroutineType(types: !20)
!20 = !{!21, !21, !11}
!21 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!22 = !DILocalVariable(name: "argc", arg: 1, scope: !18, file: !14, line: 2, type: !21)
!23 = !DIExpression()
!24 = !DILocation(line: 2, column: 14, scope: !18)
!25 = !DILocalVariable(name: "argv", arg: 2, scope: !18, file: !14, line: 2, type: !11)
!26 = !DILocation(line: 2, column: 26, scope: !18)
!27 = !DILocation(line: 2, column: 52, scope: !18)
!28 = !DILocation(line: 2, column: 38, scope: !18)
!29 = !DILocation(line: 2, column: 36, scope: !18)
!30 = !DILocalVariable(name: "y", scope: !18, file: !14, line: 2, type: !11)
!31 = !DILocation(line: 2, column: 68, scope: !18)
!32 = !DILocation(line: 2, column: 92, scope: !18)
!33 = !DILocation(line: 2, column: 91, scope: !18)
!34 = !DILocation(line: 2, column: 84, scope: !18)