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1; $ clang++ -S -emit-llvm -o - -gdwarf-5 -o - -O1 tail2.cc2; volatile int sink;3; void __attribute__((noinline)) bat() { sink++; }4; void __attribute__((noinline)) bar() { sink++; }5; void __attribute__((noinline)) foo() {6; bar(); bat();7; bar(); bat();8; }9; int __attribute__((disable_tail_calls)) main() { foo(); }10 11; On Windows, we don't handle the relocations needed for AT_return_pc properly12; and fail with "failed to compute relocation: IMAGE_REL_AMD64_ADDR32".13; UNSUPPORTED: target={{.*-(cygwin|windows-gnu|windows-msvc)}}14 15; RUN: llc -mtriple=x86_64 < %s -o - | FileCheck %s -check-prefix=ASM16; RUN: llc -mtriple=x86_64 -debugger-tune=lldb < %s -filetype=obj -o %t.o17; RUN: llvm-dwarfdump %t.o -o - | FileCheck %s -check-prefix=OBJ -implicit-check-not=DW_TAG_call -implicit-check-not=DW_AT_call18; RUN: llvm-dwarfdump -verify %t.o 2>&1 | FileCheck %s -check-prefix=VERIFY19; RUN: llvm-dwarfdump -statistics %t.o | FileCheck %s -check-prefix=STATS20; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis -o /dev/null21 22; VERIFY: No errors.23; STATS: "#call site DIEs": 5,24 25@sink = global i32 0, align 4, !dbg !026 27define void @__has_no_subprogram() {28entry:29 %0 = load volatile i32, ptr @sink, align 430 %inc = add nsw i32 %0, 131 store volatile i32 %inc, ptr @sink, align 432 ret void33}34 35; ASM: DW_TAG_subprogram36; ASM: DW_AT_call_all_calls37; OBJ: [[bat_sp:.*]]: DW_TAG_subprogram38; OBJ: DW_AT_call_all_calls (true)39; OBJ: DW_AT_name ("bat")40define void @_Z3batv() !dbg !13 {41entry:42 %0 = load volatile i32, ptr @sink, align 4, !dbg !16, !tbaa !1743 %inc = add nsw i32 %0, 1, !dbg !1644 store volatile i32 %inc, ptr @sink, align 4, !dbg !16, !tbaa !1745 ret void, !dbg !2146}47 48; ASM: DW_TAG_subprogram49; ASM: DW_AT_call_all_calls50; OBJ: [[bar_sp:.*]]: DW_TAG_subprogram51; OBJ: DW_AT_call_all_calls (true)52; OBJ: DW_AT_name ("bar")53define void @_Z3barv() !dbg !22 {54entry:55 %0 = load volatile i32, ptr @sink, align 4, !dbg !23, !tbaa !1756 %inc = add nsw i32 %0, 1, !dbg !2357 store volatile i32 %inc, ptr @sink, align 4, !dbg !23, !tbaa !1758 ret void, !dbg !2459}60 61; ASM: DW_TAG_subprogram62; ASM: DW_AT_call_all_calls63; OBJ: [[foo_sp:.*]]: DW_TAG_subprogram64; OBJ: DW_AT_call_all_calls (true)65; OBJ: DW_AT_name ("foo")66; OBJ: DW_TAG_call_site67; OBJ: DW_AT_call_origin ([[bar_sp]] "_Z3barv")68; OBJ: DW_AT_call_return_pc69; OBJ: DW_TAG_call_site70; OBJ: DW_AT_call_origin ([[bat_sp]] "_Z3batv")71; OBJ: DW_AT_call_return_pc72; OBJ: DW_TAG_call_site73; OBJ: DW_AT_call_origin ([[bar_sp]] "_Z3barv")74; OBJ: DW_AT_call_return_pc75; OBJ: DW_TAG_call_site76; OBJ: DW_AT_call_origin ([[bat_sp]] "_Z3batv")77; OBJ: DW_AT_call_tail_call78; OBJ: DW_AT_call_pc79define void @_Z3foov() !dbg !25 {80entry:81 tail call void @__has_no_subprogram()82 tail call void @_Z3barv(), !dbg !2683 tail call void @_Z3batv(), !dbg !2784 tail call void @_Z3barv(), !dbg !2685 tail call void @_Z3batv(), !dbg !2786 ret void, !dbg !2887}88 89; ASM: DW_TAG_subprogram90; ASM: DW_AT_call_all_calls91; OBJ: DW_TAG_subprogram92; OBJ: DW_AT_call_all_calls (true)93; OBJ: DW_AT_name ("main")94; OBJ: DW_TAG_call_site95; OBJ: DW_AT_call_origin ([[foo_sp]] "_Z3foov")96; OBJ: DW_AT_call_return_pc97define i32 @main() !dbg !29 {98entry:99 call void @_Z3foov(), !dbg !32100 101 call void asm sideeffect "", "~{dirflag},~{fpsr},~{flags}"()102 103 ret i32 0, !dbg !33104}105 106!llvm.dbg.cu = !{!2}107!llvm.module.flags = !{!8, !9, !10, !11}108!llvm.ident = !{!12}109 110!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())111!1 = distinct !DIGlobalVariable(name: "sink", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)112!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 7.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)113!3 = !DIFile(filename: "/Users/vsk/src/llvm.org-tailcall/tail2.cc", directory: "/Users/vsk/src/builds/llvm-project-tailcall-RA", checksumkind: CSK_MD5, checksum: "3b61952c21b7f657ddb7c0ad44cf5529")114!4 = !{}115!5 = !{!0}116!6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)117!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)118!8 = !{i32 2, !"Dwarf Version", i32 5}119!9 = !{i32 2, !"Debug Info Version", i32 3}120!10 = !{i32 1, !"wchar_size", i32 4}121!11 = !{i32 7, !"PIC Level", i32 2}122!12 = !{!"clang version 7.0.0 "}123!13 = distinct !DISubprogram(name: "bat", linkageName: "_Z3batv", scope: !3, file: !3, line: 2, type: !14, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, isOptimized: true, unit: !2, retainedNodes: !4)124!14 = !DISubroutineType(types: !15)125!15 = !{null}126!16 = !DILocation(line: 2, column: 44, scope: !13)127!17 = !{!18, !18, i64 0}128!18 = !{!"int", !19, i64 0}129!19 = !{!"omnipotent char", !20, i64 0}130!20 = !{!"Simple C++ TBAA"}131!21 = !DILocation(line: 2, column: 48, scope: !13)132!22 = distinct !DISubprogram(name: "bar", linkageName: "_Z3barv", scope: !3, file: !3, line: 3, type: !14, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, isOptimized: true, unit: !2, retainedNodes: !4)133!23 = !DILocation(line: 3, column: 44, scope: !22)134!24 = !DILocation(line: 3, column: 48, scope: !22)135!25 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !3, file: !3, line: 4, type: !14, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, isOptimized: true, unit: !2, retainedNodes: !4)136!26 = !DILocation(line: 5, column: 3, scope: !25)137!27 = !DILocation(line: 6, column: 3, scope: !25)138!28 = !DILocation(line: 7, column: 1, scope: !25)139!29 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 8, type: !30, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, isOptimized: true, unit: !2, retainedNodes: !4)140!30 = !DISubroutineType(types: !31)141!31 = !{!7}142!32 = !DILocation(line: 8, column: 50, scope: !29)143!33 = !DILocation(line: 8, column: 57, scope: !29)144