80 lines
3.9 KiB
LLVM
80 lines
3.9 KiB
LLVM
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; RUN: opt -mem2reg %s -S -o - | FileCheck %s
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;; Check that mem2reg removes dbg.value(%local, DIExpression(DW_OP_deref...))
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;; that instcombine LowerDbgDeclare inserted before the call to 'esc' when
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;; promoting the alloca %local after 'esc' has been inlined. Without this we
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;; provide no location for 'local', even though it is provably constant
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;; throughout after inlining.
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;;
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;; $ clang reduce.c -O2 -g -emit-llvm -S -o tmp.ll -Xclang -disable-llvm-passes
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;; $ opt tmp.ll -o - -instcombine -inline -S
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;; $ cat reduce.c
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;; __attribute__((__always_inline__))
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;; static void esc(unsigned char **c) {
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;; *c += 4;
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;; }
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;; void fun() {
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;; unsigned char *local = 0;
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;; esc(&local);
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;; }
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; CHECK: define dso_local void @fun()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i8* null, metadata ![[LOCAL:[0-9]+]], metadata !DIExpression())
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; CHECK-NOT: call void @llvm.dbg.value({{.*}}, metadata ![[LOCAL]]
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; CHECK: ![[LOCAL]] = !DILocalVariable(name: "local",
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define dso_local void @fun() !dbg !7 {
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entry:
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%local = alloca i8*, align 8
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%0 = bitcast i8** %local to i8*, !dbg !14
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call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %0) #3, !dbg !14
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call void @llvm.dbg.value(metadata i8* null, metadata !11, metadata !DIExpression()), !dbg !15
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store i8* null, i8** %local, align 8, !dbg !16
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call void @llvm.dbg.value(metadata i8** %local, metadata !11, metadata !DIExpression(DW_OP_deref)), !dbg !15
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call void @llvm.dbg.value(metadata i8** %local, metadata !21, metadata !DIExpression()), !dbg !27
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call void @llvm.dbg.value(metadata i8** %local, metadata !21, metadata !DIExpression()), !dbg !27
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%1 = load i8*, i8** %local, align 8, !dbg !29
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%add.ptr.i = getelementptr inbounds i8, i8* %1, i64 4, !dbg !29
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store i8* %add.ptr.i, i8** %local, align 8, !dbg !29
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%2 = bitcast i8** %local to i8*, !dbg !30
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call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %2) #3, !dbg !30
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ret void, !dbg !30
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}
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "reduce.c", directory: "/")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 12.0.0"}
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!7 = distinct !DISubprogram(name: "fun", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !{!11}
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!11 = !DILocalVariable(name: "local", scope: !7, file: !1, line: 6, type: !12)
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
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!13 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
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!14 = !DILocation(line: 6, column: 3, scope: !7)
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!15 = !DILocation(line: 0, scope: !7)
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!16 = !DILocation(line: 6, column: 18, scope: !7)
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!21 = !DILocalVariable(name: "c", arg: 1, scope: !22, file: !1, line: 2, type: !25)
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!22 = distinct !DISubprogram(name: "esc", scope: !1, file: !1, line: 2, type: !23, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !26)
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!23 = !DISubroutineType(types: !24)
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!24 = !{null, !25}
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!25 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
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!26 = !{!21}
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!27 = !DILocation(line: 0, scope: !22, inlinedAt: !28)
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!28 = distinct !DILocation(line: 7, column: 3, scope: !7)
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!29 = !DILocation(line: 3, column: 6, scope: !22, inlinedAt: !28)
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!30 = !DILocation(line: 8, column: 1, scope: !7)
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