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1; RUN: llc < %s -filetype=obj | llvm-readobj - --codeview | FileCheck %s2;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 emitted21; { // 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-passes48; $ opt -lower-expect -S -o lexicalblock.ll < lexicalblock.tmp49;50; The commands above split the lexical block containing localB and localC into51; two parts, thus creating multiple ranges for the containing lexical block52; without optimizing out the whole thing.53;54; CHECK: {{.*}}Proc{{.*}}Sym {55; CHECK: DisplayName: main56; CHECK: }57; CHECK: LocalSym {58; CHECK: VarName: argc59; CHECK: }60; CHECK: LocalSym {61; CHECK: VarName: argv62; CHECK: }63; CHECK: LocalSym {64; CHECK: VarName: localA65; CHECK: }66; CHECK: LocalSym {67; CHECK: VarName: localB68; 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 nounwind105define i32 @main(i32 %argc, ptr %argv) #0 !dbg !8 {106entry:107 %retval = alloca i32, align 4108 %argv.addr = alloca ptr, align 4109 %argc.addr = alloca i32, align 4110 %localA = alloca i32, align 4111 %localB = alloca i32, align 4112 %localC = alloca i32, align 4113 %localD = alloca i32, align 4114 %localE = alloca i32, align 4115 %localF = alloca i32, align 4116 %localG = alloca i32, align 4117 %localH = alloca i32, align 4118 store i32 0, ptr %retval, align 4119 store ptr %argv, ptr %argv.addr, align 4, !tbaa !37120 call void @llvm.dbg.declare(metadata ptr %argv.addr, metadata !17, metadata !DIExpression()), !dbg !41121 store i32 %argc, ptr %argc.addr, align 4, !tbaa !42122 call void @llvm.dbg.declare(metadata ptr %argc.addr, metadata !18, metadata !DIExpression()), !dbg !41123 call void @llvm.lifetime.start.p0(i64 4, ptr %localA) #4, !dbg !44124 call void @llvm.dbg.declare(metadata ptr %localA, metadata !19, metadata !DIExpression()), !dbg !44125 store i32 1, ptr %localA, align 4, !dbg !44, !tbaa !42126 call void @llvm.lifetime.start.p0(i64 4, ptr %localB) #4, !dbg !45127 call void @llvm.dbg.declare(metadata ptr %localB, metadata !20, metadata !DIExpression()), !dbg !45128 store i32 2, ptr %localB, align 4, !dbg !45, !tbaa !42129 %0 = load i32, ptr %argc.addr, align 4, !dbg !46, !tbaa !42130 %cmp = icmp ne i32 %0, 1, !dbg !46131 %conv = zext i1 %cmp to i32, !dbg !46132 %tobool = icmp ne i32 %conv, 0, !dbg !46133 br i1 %tobool, label %if.then, label %if.end, !dbg !46, !prof !47134 135if.then: ; preds = %entry136 call void @llvm.lifetime.start.p0(i64 4, ptr %localC) #4, !dbg !48137 call void @llvm.dbg.declare(metadata ptr %localC, metadata !22, metadata !DIExpression()), !dbg !48138 store i32 3, ptr %localC, align 4, !dbg !48, !tbaa !42139 call void @llvm.lifetime.end.p0(i64 4, ptr %localC) #4, !dbg !49140 br label %if.end, !dbg !49141 142if.end: ; preds = %if.then, %entry143 call void @llvm.lifetime.end.p0(i64 4, ptr %localB) #4, !dbg !50144 call void @llvm.lifetime.start.p0(i64 4, ptr %localD) #4, !dbg !51145 call void @llvm.dbg.declare(metadata ptr %localD, metadata !25, metadata !DIExpression()), !dbg !51146 store i32 4, ptr %localD, align 4, !dbg !51, !tbaa !42147 %1 = load i32, ptr %localD, align 4, !dbg !52, !tbaa !42148 store i32 %1, ptr %localA, align 4, !dbg !52, !tbaa !42149 call void @llvm.lifetime.end.p0(i64 4, ptr %localD) #4, !dbg !53150 call void @llvm.lifetime.start.p0(i64 4, ptr %localE) #4, !dbg !54151 call void @llvm.dbg.declare(metadata ptr %localE, metadata !27, metadata !DIExpression()), !dbg !54152 store i32 5, ptr %localE, align 4, !dbg !54, !tbaa !42153 %2 = load i32, ptr %localE, align 4, !dbg !55, !tbaa !42154 store i32 %2, ptr %localA, align 4, !dbg !55, !tbaa !42155 call void @llvm.lifetime.end.p0(i64 4, ptr %localE) #4, !dbg !56156 call void @llvm.lifetime.start.p0(i64 4, ptr %localF) #4, !dbg !57157 call void @llvm.dbg.declare(metadata ptr %localF, metadata !30, metadata !DIExpression()), !dbg !57158 store i32 6, ptr %localF, align 4, !dbg !57, !tbaa !42159 %3 = load i32, ptr %localF, align 4, !dbg !58, !tbaa !42160 store i32 %3, ptr %localA, align 4, !dbg !58, !tbaa !42161 call void @llvm.lifetime.start.p0(i64 4, ptr %localG) #4, !dbg !59162 call void @llvm.dbg.declare(metadata ptr %localG, metadata !32, metadata !DIExpression()), !dbg !59163 store i32 7, ptr %localG, align 4, !dbg !59, !tbaa !42164 %4 = load i32, ptr %localG, align 4, !dbg !60, !tbaa !42165 store i32 %4, ptr %localA, align 4, !dbg !60, !tbaa !42166 call void @llvm.lifetime.end.p0(i64 4, ptr %localG) #4, !dbg !61167 call void @llvm.lifetime.end.p0(i64 4, ptr %localF) #4, !dbg !62168 %5 = load i32, ptr %localA, align 4, !dbg !63, !tbaa !42169 %cmp1 = icmp eq i32 %5, 7, !dbg !63170 br i1 %cmp1, label %if.then2, label %if.end3, !dbg !63171 172if.then2: ; preds = %if.end173 call void @llvm.lifetime.start.p0(i64 4, ptr %localH) #4, !dbg !64174 call void @llvm.dbg.declare(metadata ptr %localH, metadata !34, metadata !DIExpression()), !dbg !64175 store i32 8, ptr %localH, align 4, !dbg !64, !tbaa !42176 %6 = load i32, ptr %localH, align 4, !dbg !65, !tbaa !42177 store i32 %6, ptr %localA, align 4, !dbg !65, !tbaa !42178 call void @llvm.lifetime.end.p0(i64 4, ptr %localH) #4, !dbg !66179 br label %if.end3, !dbg !66180 181if.end3: ; preds = %if.then2, %if.end182 %7 = load i32, ptr %localA, align 4, !dbg !67, !tbaa !42183 %cmp4 = icmp ne i32 %7, 8, !dbg !67184 %8 = zext i1 %cmp4 to i64, !dbg !67185 %cond = select i1 %cmp4, i32 -1, i32 0, !dbg !67186 call void @llvm.lifetime.end.p0(i64 4, ptr %localA) #4, !dbg !68187 ret i32 %cond, !dbg !67188}189 190; Function Attrs: nounwind readnone speculatable191declare void @llvm.dbg.declare(metadata, metadata, metadata) #1192 193; Function Attrs: argmemonly nounwind194declare void @llvm.lifetime.start.p0(i64, ptr nocapture) #2195 196; Function Attrs: nounwind readnone197declare i32 @llvm.expect.i32(i32, i32) #3198 199; Function Attrs: argmemonly nounwind200declare void @llvm.lifetime.end.p0(i64, ptr nocapture) #2201 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" "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