d8b86f7cdc
Place new and update dbg.declare calls immediately after the corresponding alloca. Current code in replaceDbgDeclareForAlloca puts the new dbg.declare at the end of the basic block. LLVM codegen has problems emitting debug info in a situation when dbg.declare appears after all uses of the variable. This usually kinda works for inlining and ASan (two users of this function) but not for SafeStack (see the pending change in http://reviews.llvm.org/D13178). llvm-svn: 248769
100 lines
4.0 KiB
LLVM
100 lines
4.0 KiB
LLVM
; RUN: opt < %s -S -inline | FileCheck %s
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;
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; The purpose of this test is to check that inline pass preserves debug info
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; for variable using the dbg.declare intrinsic.
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;
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;; This test was generated by running this command:
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;; clang.exe -S -O0 -emit-llvm -g foo.c
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;;
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;; foo.c
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;; ==========================
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;; float foo(float x)
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;; {
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;; return x;
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;; }
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;;
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;; void bar(float *dst)
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;; {
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;; dst[0] = foo(dst[0]);
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;; }
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;; ==========================
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target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
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target triple = "i686-pc-windows-msvc"
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; Function Attrs: nounwind
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define float @foo(float %x) #0 {
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entry:
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%x.addr = alloca float, align 4
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store float %x, float* %x.addr, align 4
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call void @llvm.dbg.declare(metadata float* %x.addr, metadata !16, metadata !17), !dbg !18
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%0 = load float, float* %x.addr, align 4, !dbg !19
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ret float %0, !dbg !19
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; CHECK: define void @bar
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; Function Attrs: nounwind
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define void @bar(float* %dst) #0 {
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entry:
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; CHECK: [[x_addr_i:%[a-zA-Z0-9.]+]] = alloca float, align 4
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; CHECK-NEXT: void @llvm.dbg.declare(metadata float* [[x_addr_i]], metadata [[m23:![0-9]+]], metadata !{{[0-9]+}}), !dbg [[m24:![0-9]+]]
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%dst.addr = alloca float*, align 4
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store float* %dst, float** %dst.addr, align 4
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call void @llvm.dbg.declare(metadata float** %dst.addr, metadata !20, metadata !17), !dbg !21
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%0 = load float*, float** %dst.addr, align 4, !dbg !22
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%arrayidx = getelementptr inbounds float, float* %0, i32 0, !dbg !22
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%1 = load float, float* %arrayidx, align 4, !dbg !22
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%call = call float @foo(float %1), !dbg !22
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; CHECK-NOT: call float @foo
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%2 = load float*, float** %dst.addr, align 4, !dbg !22
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%arrayidx1 = getelementptr inbounds float, float* %2, i32 0, !dbg !22
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store float %call, float* %arrayidx1, align 4, !dbg !22
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ret void, !dbg !23
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}
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 (trunk)", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "foo.c", directory: "")
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!2 = !{}
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!3 = !{!4, !9}
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!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !1, scope: !5, type: !6, function: float (float)* @foo, variables: !2)
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!5 = !DIFile(filename: "foo.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "float", size: 32, align: 32, encoding: DW_ATE_float)
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!9 = distinct !DISubprogram(name: "bar", line: 6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 7, file: !1, scope: !5, type: !10, function: void (float*)* @bar, variables: !2)
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!10 = !DISubroutineType(types: !11)
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!11 = !{null, !12}
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 32, align: 32, baseType: !8)
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!13 = !{i32 2, !"Dwarf Version", i32 4}
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = !{!"clang version 3.6.0 (trunk)"}
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!16 = !DILocalVariable(name: "x", line: 1, arg: 1, scope: !4, file: !5, type: !8)
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!17 = !DIExpression()
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!18 = !DILocation(line: 1, column: 17, scope: !4)
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!19 = !DILocation(line: 3, column: 5, scope: !4)
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!20 = !DILocalVariable(name: "dst", line: 6, arg: 1, scope: !9, file: !5, type: !12)
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!21 = !DILocation(line: 6, column: 17, scope: !9)
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!22 = !DILocation(line: 8, column: 14, scope: !9)
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!23 = !DILocation(line: 9, column: 1, scope: !9)
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; CHECK: [[FOO:![0-9]+]] = distinct !DISubprogram(name: "foo",
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; CHECK: [[BAR:![0-9]+]] = distinct !DISubprogram(name: "bar",
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; CHECK: [[m23]] = !DILocalVariable(name: "x", arg: 1, scope: [[FOO]]
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; CHECK: [[m24]] = !DILocation(line: 1, column: 17, scope: [[FOO]], inlinedAt: [[CALL_SITE:![0-9]+]])
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; CHECK: [[CALL_SITE]] = distinct !DILocation(line: 8, column: 14, scope: [[BAR]])
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