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llvm-project/llvm/test/Transforms/Util/split-bit-piece.ll

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[Utils] Insert DW_OP_bit_piece when only describing part of the variable Summary: The dbg.declare -> dbg.value conversion looks through any zext/sext to find a value to describe the variable (in the expectation that those zext/sext instruction will go away later). However, those values do not cover the entire variable and thus need a DW_OP_bit_piece. Reviewers: aprantl Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D16061 llvm-svn: 257534
2016-01-13 06:46:09 +08:00
; Checks that llvm.dbg.declare -> llvm.dbg.value conversion utility
; (here exposed through the SROA) pass, properly inserts bit_piece expressions
; if it only describes part of the variable.
; RUN: opt -S -sroa %s | FileCheck %s
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
; Function Attrs: nounwind uwtable
define hidden void @_ZN6__tsan9FastState14SetHistorySizeEi(i32 %hs) #1 align 2 {
entry:
%hs.addr = alloca i32, align 4
%v1 = alloca i64, align 8
%v2 = alloca i64, align 8
store i32 %hs, i32* %hs.addr, align 4
; CHECK: call void @llvm.dbg.value(metadata i32 %hs, i64 0, metadata !{{[0-9]+}}, metadata ![[EXPR:[0-9]+]])
; CHECK: ![[EXPR]] = !DIExpression(DW_OP_bit_piece, 0
call void @llvm.dbg.declare(metadata i64* %v1, metadata !9, metadata !12), !dbg !13
%0 = load i32, i32* %hs.addr, align 4
%conv = sext i32 %0 to i64
store i64 %conv, i64* %v1, align 8
%1 = load i64, i64* %v2, align 8
unreachable
}
attributes #0 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!7}
!llvm.ident = !{!8}
[PR27284] Reverse the ownership between DICompileUnit and DISubprogram. Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
2016-04-15 23:57:41 +08:00
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 256979) (llvm/trunk 257107)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, retainedTypes: !2)
[Utils] Insert DW_OP_bit_piece when only describing part of the variable Summary: The dbg.declare -> dbg.value conversion looks through any zext/sext to find a value to describe the variable (in the expectation that those zext/sext instruction will go away later). However, those values do not cover the entire variable and thus need a DW_OP_bit_piece. Reviewers: aprantl Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D16061 llvm-svn: 257534
2016-01-13 06:46:09 +08:00
!1 = !DIFile(filename: "tsan_shadow_test.cc", directory: "/tmp")
!2 = !{!3, !5}
!3 = !DICompositeType(tag: DW_TAG_class_type, name: "FastState", file: !4, line: 91, size: 64, align: 64, identifier: "_ZTSN6__tsan9FastStateE")
!4 = !DIFile(filename: "/mnt/extra/llvm/projects/compiler-rt/lib/tsan/rtl/tsan_rtl.h", directory: "/tmp")
!5 = distinct !DIDerivedType(tag: DW_TAG_typedef, name: "u64", line: 78, baseType: !6)
!6 = !DIBasicType(name: "long long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
!7 = !{i32 2, !"Debug Info Version", i32 3}
!8 = !{!"clang version 3.8.0 (trunk 256979) (llvm/trunk 257107)"}
!9 = !DILocalVariable(name: "v1", scope: !10, file: !4, line: 136, type: !5)
!10 = distinct !DILexicalBlock(scope: !11, file: !4, line: 136, column: 5)
DebugInfo: Remove MDString-based type references Eliminate DITypeIdentifierMap and make DITypeRef a thin wrapper around DIType*. It is no longer legal to refer to a DICompositeType by its 'identifier:', and DIBuilder no longer retains all types with an 'identifier:' automatically. Aside from the bitcode upgrade, this is mainly removing logic to resolve an MDString-based reference to an actualy DIType. The commits leading up to this have made the implicit type map in DICompileUnit's 'retainedTypes:' field superfluous. This does not remove DITypeRef, DIScopeRef, DINodeRef, and DITypeRefArray, or stop using them in DI-related metadata. Although as of this commit they aren't serving a useful purpose, there are patchces under review to reuse them for CodeView support. The tests in LLVM were updated with deref-typerefs.sh, which is attached to the thread "[RFC] Lazy-loading of debug info metadata": http://lists.llvm.org/pipermail/llvm-dev/2016-April/098318.html llvm-svn: 267296
2016-04-24 05:08:00 +08:00
!11 = distinct !DISubprogram(name: "SetHistorySize", linkageName: "_ZN6__tsan9FastState14SetHistorySizeEi", scope: !3, file: !4, line: 135, isLocal: false, isDefinition: true, scopeLine: 135, flags: DIFlagPrototyped, isOptimized: false, unit: !0)
[Utils] Insert DW_OP_bit_piece when only describing part of the variable Summary: The dbg.declare -> dbg.value conversion looks through any zext/sext to find a value to describe the variable (in the expectation that those zext/sext instruction will go away later). However, those values do not cover the entire variable and thus need a DW_OP_bit_piece. Reviewers: aprantl Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D16061 llvm-svn: 257534
2016-01-13 06:46:09 +08:00
!12 = !DIExpression()
!13 = !DILocation(line: 136, column: 5, scope: !10)