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: ScopeEndSym { 74; CHECK: Kind: S_END {{.*}} 75; CHECK: } 76; CHECK: BlockSym { 77; CHECK: Kind: S_BLOCK32 {{.*}} 78; CHECK: BlockName: 79; CHECK: } 80; CHECK: ScopeEndSym { 81; CHECK: Kind: S_END {{.*}} 82; CHECK: } 83; CHECK: BlockSym { 84; CHECK: Kind: S_BLOCK32 {{.*}} 85; CHECK: BlockName: 86; CHECK: } 87; CHECK: ScopeEndSym { 88; CHECK: } 89; CHECK: BlockSym { 90; CHECK: Kind: S_BLOCK32 {{.*}} 91; CHECK: BlockName: 92; CHECK: } 93; CHECK: ScopeEndSym { 94; CHECK: Kind: S_END {{.*}} 95; CHECK: } 96; CHECK: ProcEnd { 97; CHECK: } 98; 99; ModuleID = 'lexicalblock.cxx' 100source_filename = "lexicalblock.cxx" 101target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32" 102target triple = "i686-pc-windows-msvc" 103 104; Function Attrs: norecurse nounwind 105define i32 @main(i32 %argc, ptr %argv) #0 !dbg !8 { 106entry: 107 %retval = alloca i32, align 4 108 %argv.addr = alloca ptr, align 4 109 %argc.addr = alloca i32, align 4 110 %localA = alloca i32, align 4 111 %localB = alloca i32, align 4 112 %localC = alloca i32, align 4 113 %localD = alloca i32, align 4 114 %localE = alloca i32, align 4 115 %localF = alloca i32, align 4 116 %localG = alloca i32, align 4 117 %localH = alloca i32, align 4 118 store i32 0, ptr %retval, align 4 119 store ptr %argv, ptr %argv.addr, align 4, !tbaa !37 120 call void @llvm.dbg.declare(metadata ptr %argv.addr, metadata !17, metadata !DIExpression()), !dbg !41 121 store i32 %argc, ptr %argc.addr, align 4, !tbaa !42 122 call void @llvm.dbg.declare(metadata ptr %argc.addr, metadata !18, metadata !DIExpression()), !dbg !41 123 call void @llvm.lifetime.start.p0(i64 4, ptr %localA) #4, !dbg !44 124 call void @llvm.dbg.declare(metadata ptr %localA, metadata !19, metadata !DIExpression()), !dbg !44 125 store i32 1, ptr %localA, align 4, !dbg !44, !tbaa !42 126 call void @llvm.lifetime.start.p0(i64 4, ptr %localB) #4, !dbg !45 127 call void @llvm.dbg.declare(metadata ptr %localB, metadata !20, metadata !DIExpression()), !dbg !45 128 store i32 2, ptr %localB, align 4, !dbg !45, !tbaa !42 129 %0 = load i32, ptr %argc.addr, align 4, !dbg !46, !tbaa !42 130 %cmp = icmp ne i32 %0, 1, !dbg !46 131 %conv = zext i1 %cmp to i32, !dbg !46 132 %tobool = icmp ne i32 %conv, 0, !dbg !46 133 br i1 %tobool, label %if.then, label %if.end, !dbg !46, !prof !47 134 135if.then: ; preds = %entry 136 call void @llvm.lifetime.start.p0(i64 4, ptr %localC) #4, !dbg !48 137 call void @llvm.dbg.declare(metadata ptr %localC, metadata !22, metadata !DIExpression()), !dbg !48 138 store i32 3, ptr %localC, align 4, !dbg !48, !tbaa !42 139 call void @llvm.lifetime.end.p0(i64 4, ptr %localC) #4, !dbg !49 140 br label %if.end, !dbg !49 141 142if.end: ; preds = %if.then, %entry 143 call void @llvm.lifetime.end.p0(i64 4, ptr %localB) #4, !dbg !50 144 call void @llvm.lifetime.start.p0(i64 4, ptr %localD) #4, !dbg !51 145 call void @llvm.dbg.declare(metadata ptr %localD, metadata !25, metadata !DIExpression()), !dbg !51 146 store i32 4, ptr %localD, align 4, !dbg !51, !tbaa !42 147 %1 = load i32, ptr %localD, align 4, !dbg !52, !tbaa !42 148 store i32 %1, ptr %localA, align 4, !dbg !52, !tbaa !42 149 call void @llvm.lifetime.end.p0(i64 4, ptr %localD) #4, !dbg !53 150 call void @llvm.lifetime.start.p0(i64 4, ptr %localE) #4, !dbg !54 151 call void @llvm.dbg.declare(metadata ptr %localE, metadata !27, metadata !DIExpression()), !dbg !54 152 store i32 5, ptr %localE, align 4, !dbg !54, !tbaa !42 153 %2 = load i32, ptr %localE, align 4, !dbg !55, !tbaa !42 154 store i32 %2, ptr %localA, align 4, !dbg !55, !tbaa !42 155 call void @llvm.lifetime.end.p0(i64 4, ptr %localE) #4, !dbg !56 156 call void @llvm.lifetime.start.p0(i64 4, ptr %localF) #4, !dbg !57 157 call void @llvm.dbg.declare(metadata ptr %localF, metadata !30, metadata !DIExpression()), !dbg !57 158 store i32 6, ptr %localF, align 4, !dbg !57, !tbaa !42 159 %3 = load i32, ptr %localF, align 4, !dbg !58, !tbaa !42 160 store i32 %3, ptr %localA, align 4, !dbg !58, !tbaa !42 161 call void @llvm.lifetime.start.p0(i64 4, ptr %localG) #4, !dbg !59 162 call void @llvm.dbg.declare(metadata ptr %localG, metadata !32, metadata !DIExpression()), !dbg !59 163 store i32 7, ptr %localG, align 4, !dbg !59, !tbaa !42 164 %4 = load i32, ptr %localG, align 4, !dbg !60, !tbaa !42 165 store i32 %4, ptr %localA, align 4, !dbg !60, !tbaa !42 166 call void @llvm.lifetime.end.p0(i64 4, ptr %localG) #4, !dbg !61 167 call void @llvm.lifetime.end.p0(i64 4, ptr %localF) #4, !dbg !62 168 %5 = load i32, ptr %localA, align 4, !dbg !63, !tbaa !42 169 %cmp1 = icmp eq i32 %5, 7, !dbg !63 170 br i1 %cmp1, label %if.then2, label %if.end3, !dbg !63 171 172if.then2: ; preds = %if.end 173 call void @llvm.lifetime.start.p0(i64 4, ptr %localH) #4, !dbg !64 174 call void @llvm.dbg.declare(metadata ptr %localH, metadata !34, metadata !DIExpression()), !dbg !64 175 store i32 8, ptr %localH, align 4, !dbg !64, !tbaa !42 176 %6 = load i32, ptr %localH, align 4, !dbg !65, !tbaa !42 177 store i32 %6, ptr %localA, align 4, !dbg !65, !tbaa !42 178 call void @llvm.lifetime.end.p0(i64 4, ptr %localH) #4, !dbg !66 179 br label %if.end3, !dbg !66 180 181if.end3: ; preds = %if.then2, %if.end 182 %7 = load i32, ptr %localA, align 4, !dbg !67, !tbaa !42 183 %cmp4 = icmp ne i32 %7, 8, !dbg !67 184 %8 = zext i1 %cmp4 to i64, !dbg !67 185 %cond = select i1 %cmp4, i32 -1, i32 0, !dbg !67 186 call void @llvm.lifetime.end.p0(i64 4, ptr %localA) #4, !dbg !68 187 ret i32 %cond, !dbg !67 188} 189 190; Function Attrs: nounwind readnone speculatable 191declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 192 193; Function Attrs: argmemonly nounwind 194declare void @llvm.lifetime.start.p0(i64, ptr nocapture) #2 195 196; Function Attrs: nounwind readnone 197declare i32 @llvm.expect.i32(i32, i32) #3 198 199; Function Attrs: argmemonly nounwind 200declare void @llvm.lifetime.end.p0(i64, ptr nocapture) #2 201 202attributes #0 = { norecurse nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "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" } 203attributes #1 = { nounwind readnone speculatable } 204attributes #2 = { argmemonly nounwind } 205attributes #3 = { nounwind readnone } 206attributes #4 = { nounwind } 207 208!llvm.dbg.cu = !{!0} 209!llvm.module.flags = !{!3, !4, !5, !6} 210!llvm.ident = !{!7} 211 212!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) 213!1 = !DIFile(filename: "<stdin>", directory: "C:/path/to/directory", checksumkind: CSK_MD5, checksum: "169b810b4f895de9a9e19d8d0634af5d") 214!2 = !{} 215!3 = !{i32 1, !"NumRegisterParameters", i32 0} 216!4 = !{i32 2, !"CodeView", i32 1} 217!5 = !{i32 2, !"Debug Info Version", i32 3} 218!6 = !{i32 1, !"wchar_size", i32 2} 219!7 = !{!"clang version 7.0.0 (trunk)"} 220!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) 221!9 = !DIFile(filename: "lexicalblock.cxx", directory: "C:/path/to/directory", checksumkind: CSK_MD5, checksum: "169b810b4f895de9a9e19d8d0634af5d") 222!10 = !DISubroutineType(types: !11) 223!11 = !{!12, !12, !13} 224!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 225!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 32) 226!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 32) 227!15 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) 228!16 = !{!17, !18, !19, !20, !22, !25, !27, !30, !32, !34} 229!17 = !DILocalVariable(name: "argv", arg: 2, scope: !8, file: !9, line: 1, type: !13) 230!18 = !DILocalVariable(name: "argc", arg: 1, scope: !8, file: !9, line: 1, type: !12) 231!19 = !DILocalVariable(name: "localA", scope: !8, file: !9, line: 2, type: !12) 232!20 = !DILocalVariable(name: "localB", scope: !21, file: !9, line: 5, type: !12) 233!21 = distinct !DILexicalBlock(scope: !8, file: !9, line: 4) 234!22 = !DILocalVariable(name: "localC", scope: !23, file: !9, line: 8, type: !12) 235!23 = distinct !DILexicalBlock(scope: !24, file: !9, line: 7) 236!24 = distinct !DILexicalBlock(scope: !21, file: !9, line: 7) 237!25 = !DILocalVariable(name: "localD", scope: !26, file: !9, line: 13, type: !12) 238!26 = distinct !DILexicalBlock(scope: !8, file: !9, line: 12) 239!27 = !DILocalVariable(name: "localE", scope: !28, file: !9, line: 19, type: !12) 240!28 = distinct !DILexicalBlock(scope: !29, file: !9, line: 18) 241!29 = distinct !DILexicalBlock(scope: !8, file: !9, line: 17) 242!30 = !DILocalVariable(name: "localF", scope: !31, file: !9, line: 25, type: !12) 243!31 = distinct !DILexicalBlock(scope: !8, file: !9, line: 24) 244!32 = !DILocalVariable(name: "localG", scope: !33, file: !9, line: 29, type: !12) 245!33 = distinct !DILexicalBlock(scope: !31, file: !9, line: 28) 246!34 = !DILocalVariable(name: "localH", scope: !35, file: !9, line: 35, type: !12) 247!35 = distinct !DILexicalBlock(scope: !36, file: !9, line: 34) 248!36 = distinct !DILexicalBlock(scope: !8, file: !9, line: 34) 249!37 = !{!38, !38, i64 0} 250!38 = !{!"any pointer", !39, i64 0} 251!39 = !{!"omnipotent char", !40, i64 0} 252!40 = !{!"Simple C++ TBAA"} 253!41 = !DILocation(line: 1, scope: !8) 254!42 = !{!43, !43, i64 0} 255!43 = !{!"int", !39, i64 0} 256!44 = !DILocation(line: 2, scope: !8) 257!45 = !DILocation(line: 5, scope: !21) 258!46 = !DILocation(line: 7, scope: !21) 259!47 = !{!"branch_weights", i32 1, i32 2000} 260!48 = !DILocation(line: 8, scope: !23) 261!49 = !DILocation(line: 9, scope: !23) 262!50 = !DILocation(line: 10, scope: !21) 263!51 = !DILocation(line: 13, scope: !26) 264!52 = !DILocation(line: 14, scope: !26) 265!53 = !DILocation(line: 15, scope: !26) 266!54 = !DILocation(line: 19, scope: !28) 267!55 = !DILocation(line: 20, scope: !28) 268!56 = !DILocation(line: 21, scope: !28) 269!57 = !DILocation(line: 25, scope: !31) 270!58 = !DILocation(line: 26, scope: !31) 271!59 = !DILocation(line: 29, scope: !33) 272!60 = !DILocation(line: 30, scope: !33) 273!61 = !DILocation(line: 31, scope: !33) 274!62 = !DILocation(line: 32, scope: !31) 275!63 = !DILocation(line: 34, scope: !8) 276!64 = !DILocation(line: 35, scope: !35) 277!65 = !DILocation(line: 36, scope: !35) 278!66 = !DILocation(line: 37, scope: !35) 279!67 = !DILocation(line: 39, scope: !8) 280!68 = !DILocation(line: 40, scope: !8) 281