[HWASan] add test for debug info of allocas that don't need padding.

[eugenis]

llvm/test/Instrumentation/HWAddressSanitizer/dbg-value-tag-offset-nopad.ll

15

Could you also test that this points to the right alloca?

[fmayer]

address comment

[fmayer]

ping

[eugenis]

LGTM

llvm/test/Instrumentation/HWAddressSanitizer/dbg-value-tag-offset-nopad.ll

+; RUN: opt -passes=hwasan -S -o - %s | FileCheck %s
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-unknown-linux-android24"
+
+define dso_local void @f() sanitize_hwaddress !dbg !14 {
+  %a1 = alloca i128, align 4
+  %a2 = alloca i128, align 4
+  %1 = bitcast i128* %a1 to i8*, !dbg !21
+  %2 = bitcast i128* %a2 to i8*, !dbg !21
+; CHECK: call void @llvm.dbg.value(metadata i128 1, {{.*}}, metadata !DIExpression())
+  call void @llvm.dbg.value(metadata i128 1, metadata !20, metadata !DIExpression()), !dbg !22
+  store i128 1, i128* %a2, align 4, !dbg !23, !tbaa !24
+; CHECK: call void @llvm.dbg.value(metadata i128* %a1, {{.*}}, metadata !DIExpression(DW_OP_LLVM_tag_offset, 0, DW_OP_deref))
+  call void @llvm.dbg.value(metadata i128* %a1, metadata !18, metadata !DIExpression(DW_OP_deref)), !dbg !22
+  call void @use(i8* nonnull %1), !dbg !28
+; CHECK: call void @llvm.dbg.value(metadata i128* %a2, {{.*}}, metadata !DIExpression(DW_OP_LLVM_tag_offset, 128, DW_OP_deref))
+  call void @llvm.dbg.value(metadata i128* %a2, metadata !20, metadata !DIExpression(DW_OP_deref)), !dbg !22
+  call void @use(i8* nonnull %2), !dbg !29
+  ret void, !dbg !30
+}
+
+declare !dbg !5 void @use(i8*)
+
+declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!8, !9, !10, !11, !12}
+!llvm.ident = !{!13}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 10.0.0 ([e-mail]:llvm/llvm-project.git 5560dd08b99a0e8b0c55116376624e4f967caec5)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)
+!1 = !DIFile(filename: "dbg.cc", directory: "/tmp")
+!2 = !{}
+!3 = !{!4, !5}
+!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
+!5 = !DISubprogram(name: "use", scope: !1, file: !1, line: 2, type: !6, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
+!6 = !DISubroutineType(types: !7)
+!7 = !{null, !4}
+!8 = !{i32 7, !"Dwarf Version", i32 4}
+!9 = !{i32 2, !"Debug Info Version", i32 3}
+!10 = !{i32 1, !"wchar_size", i32 4}
+!11 = !{i32 7, !"PIC Level", i32 2}
+!12 = !{i32 7, !"PIE Level", i32 2}
+!13 = !{!"clang version 10.0.0 ([e-mail]:llvm/llvm-project.git 5560dd08b99a0e8b0c55116376624e4f967caec5)"}
+!14 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !15, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !17)
+!15 = !DISubroutineType(types: !16)
+!16 = !{null}
+!17 = !{!18, !20}
+!18 = !DILocalVariable(name: "x", scope: !14, file: !1, line: 5, type: !19)
+!19 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!20 = !DILocalVariable(name: "y", scope: !14, file: !1, line: 5, type: !19)
+!21 = !DILocation(line: 5, column: 3, scope: !14)
+!22 = !DILocation(line: 0, scope: !14)
+!23 = !DILocation(line: 5, column: 10, scope: !14)
+!24 = !{!25, !25, i64 0}
+!25 = !{!"int", !26, i64 0}
+!26 = !{!"omnipotent char", !27, i64 0}
+!27 = !{!"Simple C++ TBAA"}
+!28 = !DILocation(line: 6, column: 3, scope: !14)
+!29 = !DILocation(line: 7, column: 3, scope: !14)
+!30 = !DILocation(line: 8, column: 1, scope: !14)