1; RUN: llc < %s -filetype=obj | llvm-readobj - -codeview | FileCheck %s 2; 3; -- lexicablock.cxx begin ---------------------------------------------------- 4; int main(int argc, char *argv[]) { 5; int localA = 1; 6; 7; { // S_BLOCK32 not emitted because it has multiple address ranges. 8; int localB = 2; 9; 10; if (__builtin_expect(argc != 1, 0)) { // S_BLOCK32 containing 'localC' 11; int localC = 3; 12; } 13; } 14; 15; { // S_BLOCK32 containing 'localD' 16; int localD = 4; 17; localA = localD; 18; } 19; 20; { // S_BLOCK32 not emitted 21; { // S_BLOCK32 containing 'localE' 22; int localE = 5; 23; localA = localE; 24; } 25; } 26; 27; { // S_BLOCK32 containing 'localF' 28; int localF = 6; 29; localA = localF; 30; 31; { // S_BLOCK32 containing 'localG' 32; int localG = 7; 33; localA = localG; 34; } 35; } 36; 37; if (localA == 7) { // S_BLOCK32 containing 'localH' 38; int localH = 8; 39; localA = localH; 40; } 41; 42; return localA != 8 ? -1 : 0; 43; } 44; -- lexicalblock.cxx end ----------------------------------------------------- 45; 46; To regenerate the IR below: 47; $ clang -cc1 -triple i686-pc-windows -emit-llvm -o lexicalblock.tmp -debug-info-kind=limited -gcodeview lexicablock.cxx -O1 -disable-llvm-passes 48; $ opt -lower-expect -S -o lexicalblock.ll < lexicalblock.tmp 49; 50; The commands above split the lexical block containing localB and localC into 51; two parts, thus creating multiple ranges for the containing lexical block 52; without optimizing out the whole thing. 53; 54; CHECK: {{.*}}Proc{{.*}}Sym { 55; CHECK: DisplayName: main 56; CHECK: } 57; CHECK: LocalSym { 58; CHECK: VarName: argc 59; CHECK: } 60; CHECK: LocalSym { 61; CHECK: VarName: argv 62; CHECK: } 63; CHECK: LocalSym { 64; CHECK: VarName: localA 65; CHECK: } 66; CHECK: LocalSym { 67; CHECK: VarName: localB 68; CHECK: } 69; CHECK: BlockSym { 70; CHECK: Kind: S_BLOCK32 {{.*}} 71; CHECK: BlockName: 72; CHECK: } 73; CHECK: LocalSym { 74; CHECK: VarName: localC 75; CHECK: } 76; CHECK: ScopeEndSym { 77; CHECK: Kind: S_END {{.*}} 78; CHECK: } 79; CHECK: BlockSym { 80; CHECK: Kind: S_BLOCK32 {{.*}} 81; CHECK: BlockName: 82; CHECK: } 83; CHECK: LocalSym { 84; CHECK: VarName: localD 85; CHECK: } 86; CHECK: ScopeEndSym { 87; CHECK: Kind: S_END {{.*}} 88; CHECK: } 89; CHECK: BlockSym { 90; CHECK: Kind: S_BLOCK32 {{.*}} 91; CHECK: BlockName: 92; CHECK: } 93; CHECK: LocalSym { 94; CHECK: VarName: localE 95; CHECK: } 96; CHECK: ScopeEndSym { 97; CHECK: } 98; CHECK: BlockSym { 99; CHECK: Kind: S_BLOCK32 {{.*}} 100; CHECK: BlockName: 101; CHECK: } 102; CHECK: LocalSym { 103; CHECK: VarName: localF 104; CHECK: } 105; CHECK: BlockSym { 106; CHECK: Kind: S_BLOCK32 {{.*}} 107; CHECK: BlockName: 108; CHECK: } 109; CHECK: LocalSym { 110; CHECK: VarName: localG 111; CHECK: } 112; CHECK: ScopeEndSym { 113; CHECK: Kind: S_END {{.*}} 114; CHECK: } 115; CHECK: ScopeEndSym { 116; CHECK: Kind: S_END {{.*}} 117; CHECK: } 118; CHECK: BlockSym { 119; CHECK: Kind: S_BLOCK32 {{.*}} 120; CHECK: BlockName: 121; CHECK: } 122; CHECK: LocalSym { 123; CHECK: VarName: localH 124; CHECK: } 125; CHECK: ScopeEndSym { 126; CHECK: Kind: S_END {{.*}} 127; CHECK: } 128; CHECK: ProcEnd { 129; CHECK: } 130; 131; ModuleID = 'lexicalblock.cxx' 132source_filename = "lexicalblock.cxx" 133target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32" 134target triple = "i686-pc-windows-msvc" 135 136; Function Attrs: norecurse nounwind 137define i32 @main(i32 %argc, i8** %argv) #0 !dbg !8 { 138entry: 139 %retval = alloca i32, align 4 140 %argv.addr = alloca i8**, align 4 141 %argc.addr = alloca i32, align 4 142 %localA = alloca i32, align 4 143 %localB = alloca i32, align 4 144 %localC = alloca i32, align 4 145 %localD = alloca i32, align 4 146 %localE = alloca i32, align 4 147 %localF = alloca i32, align 4 148 %localG = alloca i32, align 4 149 %localH = alloca i32, align 4 150 store i32 0, i32* %retval, align 4 151 store i8** %argv, i8*** %argv.addr, align 4, !tbaa !37 152 call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !17, metadata !DIExpression()), !dbg !41 153 store i32 %argc, i32* %argc.addr, align 4, !tbaa !42 154 call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !18, metadata !DIExpression()), !dbg !41 155 %0 = bitcast i32* %localA to i8*, !dbg !44 156 call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #4, !dbg !44 157 call void @llvm.dbg.declare(metadata i32* %localA, metadata !19, metadata !DIExpression()), !dbg !44 158 store i32 1, i32* %localA, align 4, !dbg !44, !tbaa !42 159 %1 = bitcast i32* %localB to i8*, !dbg !45 160 call void @llvm.lifetime.start.p0i8(i64 4, i8* %1) #4, !dbg !45 161 call void @llvm.dbg.declare(metadata i32* %localB, metadata !20, metadata !DIExpression()), !dbg !45 162 store i32 2, i32* %localB, align 4, !dbg !45, !tbaa !42 163 %2 = load i32, i32* %argc.addr, align 4, !dbg !46, !tbaa !42 164 %cmp = icmp ne i32 %2, 1, !dbg !46 165 %conv = zext i1 %cmp to i32, !dbg !46 166 %tobool = icmp ne i32 %conv, 0, !dbg !46 167 br i1 %tobool, label %if.then, label %if.end, !dbg !46, !prof !47 168 169if.then: ; preds = %entry 170 %3 = bitcast i32* %localC to i8*, !dbg !48 171 call void @llvm.lifetime.start.p0i8(i64 4, i8* %3) #4, !dbg !48 172 call void @llvm.dbg.declare(metadata i32* %localC, metadata !22, metadata !DIExpression()), !dbg !48 173 store i32 3, i32* %localC, align 4, !dbg !48, !tbaa !42 174 %4 = bitcast i32* %localC to i8*, !dbg !49 175 call void @llvm.lifetime.end.p0i8(i64 4, i8* %4) #4, !dbg !49 176 br label %if.end, !dbg !49 177 178if.end: ; preds = %if.then, %entry 179 %5 = bitcast i32* %localB to i8*, !dbg !50 180 call void @llvm.lifetime.end.p0i8(i64 4, i8* %5) #4, !dbg !50 181 %6 = bitcast i32* %localD to i8*, !dbg !51 182 call void @llvm.lifetime.start.p0i8(i64 4, i8* %6) #4, !dbg !51 183 call void @llvm.dbg.declare(metadata i32* %localD, metadata !25, metadata !DIExpression()), !dbg !51 184 store i32 4, i32* %localD, align 4, !dbg !51, !tbaa !42 185 %7 = load i32, i32* %localD, align 4, !dbg !52, !tbaa !42 186 store i32 %7, i32* %localA, align 4, !dbg !52, !tbaa !42 187 %8 = bitcast i32* %localD to i8*, !dbg !53 188 call void @llvm.lifetime.end.p0i8(i64 4, i8* %8) #4, !dbg !53 189 %9 = bitcast i32* %localE to i8*, !dbg !54 190 call void @llvm.lifetime.start.p0i8(i64 4, i8* %9) #4, !dbg !54 191 call void @llvm.dbg.declare(metadata i32* %localE, metadata !27, metadata !DIExpression()), !dbg !54 192 store i32 5, i32* %localE, align 4, !dbg !54, !tbaa !42 193 %10 = load i32, i32* %localE, align 4, !dbg !55, !tbaa !42 194 store i32 %10, i32* %localA, align 4, !dbg !55, !tbaa !42 195 %11 = bitcast i32* %localE to i8*, !dbg !56 196 call void @llvm.lifetime.end.p0i8(i64 4, i8* %11) #4, !dbg !56 197 %12 = bitcast i32* %localF to i8*, !dbg !57 198 call void @llvm.lifetime.start.p0i8(i64 4, i8* %12) #4, !dbg !57 199 call void @llvm.dbg.declare(metadata i32* %localF, metadata !30, metadata !DIExpression()), !dbg !57 200 store i32 6, i32* %localF, align 4, !dbg !57, !tbaa !42 201 %13 = load i32, i32* %localF, align 4, !dbg !58, !tbaa !42 202 store i32 %13, i32* %localA, align 4, !dbg !58, !tbaa !42 203 %14 = bitcast i32* %localG to i8*, !dbg !59 204 call void @llvm.lifetime.start.p0i8(i64 4, i8* %14) #4, !dbg !59 205 call void @llvm.dbg.declare(metadata i32* %localG, metadata !32, metadata !DIExpression()), !dbg !59 206 store i32 7, i32* %localG, align 4, !dbg !59, !tbaa !42 207 %15 = load i32, i32* %localG, align 4, !dbg !60, !tbaa !42 208 store i32 %15, i32* %localA, align 4, !dbg !60, !tbaa !42 209 %16 = bitcast i32* %localG to i8*, !dbg !61 210 call void @llvm.lifetime.end.p0i8(i64 4, i8* %16) #4, !dbg !61 211 %17 = bitcast i32* %localF to i8*, !dbg !62 212 call void @llvm.lifetime.end.p0i8(i64 4, i8* %17) #4, !dbg !62 213 %18 = load i32, i32* %localA, align 4, !dbg !63, !tbaa !42 214 %cmp1 = icmp eq i32 %18, 7, !dbg !63 215 br i1 %cmp1, label %if.then2, label %if.end3, !dbg !63 216 217if.then2: ; preds = %if.end 218 %19 = bitcast i32* %localH to i8*, !dbg !64 219 call void @llvm.lifetime.start.p0i8(i64 4, i8* %19) #4, !dbg !64 220 call void @llvm.dbg.declare(metadata i32* %localH, metadata !34, metadata !DIExpression()), !dbg !64 221 store i32 8, i32* %localH, align 4, !dbg !64, !tbaa !42 222 %20 = load i32, i32* %localH, align 4, !dbg !65, !tbaa !42 223 store i32 %20, i32* %localA, align 4, !dbg !65, !tbaa !42 224 %21 = bitcast i32* %localH to i8*, !dbg !66 225 call void @llvm.lifetime.end.p0i8(i64 4, i8* %21) #4, !dbg !66 226 br label %if.end3, !dbg !66 227 228if.end3: ; preds = %if.then2, %if.end 229 %22 = load i32, i32* %localA, align 4, !dbg !67, !tbaa !42 230 %cmp4 = icmp ne i32 %22, 8, !dbg !67 231 %23 = zext i1 %cmp4 to i64, !dbg !67 232 %cond = select i1 %cmp4, i32 -1, i32 0, !dbg !67 233 %24 = bitcast i32* %localA to i8*, !dbg !68 234 call void @llvm.lifetime.end.p0i8(i64 4, i8* %24) #4, !dbg !68 235 ret i32 %cond, !dbg !67 236} 237 238; Function Attrs: nounwind readnone speculatable 239declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 240 241; Function Attrs: argmemonly nounwind 242declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #2 243 244; Function Attrs: nounwind readnone 245declare i32 @llvm.expect.i32(i32, i32) #3 246 247; Function Attrs: argmemonly nounwind 248declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #2 249 250attributes #0 = { norecurse nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+x87" "unsafe-fp-math"="false" "use-soft-float"="false" } 251attributes #1 = { nounwind readnone speculatable } 252attributes #2 = { argmemonly nounwind } 253attributes #3 = { nounwind readnone } 254attributes #4 = { nounwind } 255 256!llvm.dbg.cu = !{!0} 257!llvm.module.flags = !{!3, !4, !5, !6} 258!llvm.ident = !{!7} 259 260!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 7.0.0 (trunk)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 261!1 = !DIFile(filename: "<stdin>", directory: "C:/path/to/directory", checksumkind: CSK_MD5, checksum: "169b810b4f895de9a9e19d8d0634af5d") 262!2 = !{} 263!3 = !{i32 1, !"NumRegisterParameters", i32 0} 264!4 = !{i32 2, !"CodeView", i32 1} 265!5 = !{i32 2, !"Debug Info Version", i32 3} 266!6 = !{i32 1, !"wchar_size", i32 2} 267!7 = !{!"clang version 7.0.0 (trunk)"} 268!8 = distinct !DISubprogram(name: "main", scope: !9, file: !9, line: 1, type: !10, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !16) 269!9 = !DIFile(filename: "lexicalblock.cxx", directory: "C:/path/to/directory", checksumkind: CSK_MD5, checksum: "169b810b4f895de9a9e19d8d0634af5d") 270!10 = !DISubroutineType(types: !11) 271!11 = !{!12, !12, !13} 272!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 273!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 32) 274!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 32) 275!15 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) 276!16 = !{!17, !18, !19, !20, !22, !25, !27, !30, !32, !34} 277!17 = !DILocalVariable(name: "argv", arg: 2, scope: !8, file: !9, line: 1, type: !13) 278!18 = !DILocalVariable(name: "argc", arg: 1, scope: !8, file: !9, line: 1, type: !12) 279!19 = !DILocalVariable(name: "localA", scope: !8, file: !9, line: 2, type: !12) 280!20 = !DILocalVariable(name: "localB", scope: !21, file: !9, line: 5, type: !12) 281!21 = distinct !DILexicalBlock(scope: !8, file: !9, line: 4) 282!22 = !DILocalVariable(name: "localC", scope: !23, file: !9, line: 8, type: !12) 283!23 = distinct !DILexicalBlock(scope: !24, file: !9, line: 7) 284!24 = distinct !DILexicalBlock(scope: !21, file: !9, line: 7) 285!25 = !DILocalVariable(name: "localD", scope: !26, file: !9, line: 13, type: !12) 286!26 = distinct !DILexicalBlock(scope: !8, file: !9, line: 12) 287!27 = !DILocalVariable(name: "localE", scope: !28, file: !9, line: 19, type: !12) 288!28 = distinct !DILexicalBlock(scope: !29, file: !9, line: 18) 289!29 = distinct !DILexicalBlock(scope: !8, file: !9, line: 17) 290!30 = !DILocalVariable(name: "localF", scope: !31, file: !9, line: 25, type: !12) 291!31 = distinct !DILexicalBlock(scope: !8, file: !9, line: 24) 292!32 = !DILocalVariable(name: "localG", scope: !33, file: !9, line: 29, type: !12) 293!33 = distinct !DILexicalBlock(scope: !31, file: !9, line: 28) 294!34 = !DILocalVariable(name: "localH", scope: !35, file: !9, line: 35, type: !12) 295!35 = distinct !DILexicalBlock(scope: !36, file: !9, line: 34) 296!36 = distinct !DILexicalBlock(scope: !8, file: !9, line: 34) 297!37 = !{!38, !38, i64 0} 298!38 = !{!"any pointer", !39, i64 0} 299!39 = !{!"omnipotent char", !40, i64 0} 300!40 = !{!"Simple C++ TBAA"} 301!41 = !DILocation(line: 1, scope: !8) 302!42 = !{!43, !43, i64 0} 303!43 = !{!"int", !39, i64 0} 304!44 = !DILocation(line: 2, scope: !8) 305!45 = !DILocation(line: 5, scope: !21) 306!46 = !DILocation(line: 7, scope: !21) 307!47 = !{!"branch_weights", i32 1, i32 2000} 308!48 = !DILocation(line: 8, scope: !23) 309!49 = !DILocation(line: 9, scope: !23) 310!50 = !DILocation(line: 10, scope: !21) 311!51 = !DILocation(line: 13, scope: !26) 312!52 = !DILocation(line: 14, scope: !26) 313!53 = !DILocation(line: 15, scope: !26) 314!54 = !DILocation(line: 19, scope: !28) 315!55 = !DILocation(line: 20, scope: !28) 316!56 = !DILocation(line: 21, scope: !28) 317!57 = !DILocation(line: 25, scope: !31) 318!58 = !DILocation(line: 26, scope: !31) 319!59 = !DILocation(line: 29, scope: !33) 320!60 = !DILocation(line: 30, scope: !33) 321!61 = !DILocation(line: 31, scope: !33) 322!62 = !DILocation(line: 32, scope: !31) 323!63 = !DILocation(line: 34, scope: !8) 324!64 = !DILocation(line: 35, scope: !35) 325!65 = !DILocation(line: 36, scope: !35) 326!66 = !DILocation(line: 37, scope: !35) 327!67 = !DILocation(line: 39, scope: !8) 328!68 = !DILocation(line: 40, scope: !8) 329