1 ; ModuleID = 'array.c' 2 ; 3 ; From (clang -g -c -O1): 4 ; 5 ; void f(int* p) { 6 ; p[0] = 42; 7 ; } 8 ; 9 ; int main(int argc, char** argv) { 10 ; int array[4] = { 0, 1, 2, 3 }; 11 ; f(array); 12 ; return array[0]; 13 ; } 14 ; 15 ; RUN: llc -filetype=asm %s -o - | FileCheck %s 16 ; RUN: llc -filetype=obj %s -o - | llvm-dwarfdump -v - ---debug-info | FileCheck %s --check-prefix=DWARF 17 18 ; CHECK-LABEL: _main: 19 ; CHECK: movaps {{.*}}, (%rsp) 20 ; CHECK: movq %rsp, %rdi 21 ; CHECK: callq _f 22 23 ; DWARF: DW_TAG_variable 24 ; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_fbreg +0) 25 ; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}} = "array") 26 27 ; ModuleID = '/tmp/array.c' 28 source_filename = "/tmp/array.c" 29 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 30 target triple = "x86_64-apple-macosx10.12.0" 31 32 @main.array = private unnamed_addr constant [4 x i32] [i32 0, i32 1, i32 2, i32 3], align 16 33 34 ; Function Attrs: nounwind ssp uwtable 35 define void @f(i32* nocapture %p) local_unnamed_addr #0 !dbg !8 { 36 entry: 37 tail call void @llvm.dbg.value(metadata i32* %p, metadata !14, metadata !15), !dbg !16 38 store i32 42, i32* %p, align 4, !dbg !17, !tbaa !18 39 ret void, !dbg !22 40 } 41 42 ; Function Attrs: nounwind readnone speculatable 43 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 44 45 ; Function Attrs: nounwind ssp uwtable 46 define i32 @main(i32 %argc, i8** nocapture readnone %argv) local_unnamed_addr #0 !dbg !23 { 47 entry: 48 %array = alloca [4 x i32], align 16 49 tail call void @llvm.dbg.value(metadata i32 %argc, metadata !30, metadata !15), !dbg !36 50 tail call void @llvm.dbg.value(metadata i8** %argv, metadata !31, metadata !15), !dbg !37 51 %0 = bitcast [4 x i32]* %array to i8*, !dbg !38 52 call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull %0) #3, !dbg !38 53 tail call void @llvm.dbg.declare(metadata [4 x i32]* %array, metadata !32, metadata !15), !dbg !39 54 call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 16 nonnull %0, i8* align 16 bitcast ([4 x i32]* @main.array to i8*), i64 16, i1 false), !dbg !39 55 %arraydecay = getelementptr inbounds [4 x i32], [4 x i32]* %array, i64 0, i64 0, !dbg !40 56 call void @f(i32* nonnull %arraydecay), !dbg !41 57 %1 = load i32, i32* %arraydecay, align 16, !dbg !42, !tbaa !18 58 call void @llvm.lifetime.end.p0i8(i64 16, i8* nonnull %0) #3, !dbg !43 59 ret i32 %1, !dbg !44 60 } 61 62 ; Function Attrs: argmemonly nounwind 63 declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #2 64 65 ; Function Attrs: argmemonly nounwind 66 declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #2 67 68 ; Function Attrs: argmemonly nounwind 69 declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #2 70 71 ; Function Attrs: nounwind readnone speculatable 72 declare void @llvm.dbg.value(metadata, metadata, metadata) #1 73 74 attributes #0 = { nounwind ssp uwtable } 75 attributes #1 = { nounwind readnone speculatable } 76 attributes #2 = { argmemonly nounwind } 77 attributes #3 = { nounwind } 78 79 !llvm.dbg.cu = !{!0} 80 !llvm.module.flags = !{!3, !4, !5, !6} 81 !llvm.ident = !{!7} 82 83 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk 303873) (llvm/trunk 303875)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 84 !1 = !DIFile(filename: "/tmp/array.c", directory: "/") 85 !2 = !{} 86 !3 = !{i32 2, !"Dwarf Version", i32 4} 87 !4 = !{i32 2, !"Debug Info Version", i32 3} 88 !5 = !{i32 1, !"wchar_size", i32 4} 89 !6 = !{i32 7, !"PIC Level", i32 2} 90 !7 = !{!"clang version 5.0.0 (trunk 303873) (llvm/trunk 303875)"} 91 !8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !13) 92 !9 = !DISubroutineType(types: !10) 93 !10 = !{null, !11} 94 !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64) 95 !12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 96 !13 = !{!14} 97 !14 = !DILocalVariable(name: "p", arg: 1, scope: !8, file: !1, line: 1, type: !11) 98 !15 = !DIExpression() 99 !16 = !DILocation(line: 1, column: 13, scope: !8) 100 !17 = !DILocation(line: 2, column: 8, scope: !8) 101 !18 = !{!19, !19, i64 0} 102 !19 = !{!"int", !20, i64 0} 103 !20 = !{!"omnipotent char", !21, i64 0} 104 !21 = !{!"Simple C/C++ TBAA"} 105 !22 = !DILocation(line: 3, column: 1, scope: !8) 106 !23 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 5, type: !24, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !29) 107 !24 = !DISubroutineType(types: !25) 108 !25 = !{!12, !12, !26} 109 !26 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !27, size: 64) 110 !27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !28, size: 64) 111 !28 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) 112 !29 = !{!30, !31, !32} 113 !30 = !DILocalVariable(name: "argc", arg: 1, scope: !23, file: !1, line: 5, type: !12) 114 !31 = !DILocalVariable(name: "argv", arg: 2, scope: !23, file: !1, line: 5, type: !26) 115 !32 = !DILocalVariable(name: "array", scope: !23, file: !1, line: 6, type: !33) 116 !33 = !DICompositeType(tag: DW_TAG_array_type, baseType: !12, size: 128, elements: !34) 117 !34 = !{!35} 118 !35 = !DISubrange(count: 4) 119 !36 = !DILocation(line: 5, column: 14, scope: !23) 120 !37 = !DILocation(line: 5, column: 27, scope: !23) 121 !38 = !DILocation(line: 6, column: 3, scope: !23) 122 !39 = !DILocation(line: 6, column: 7, scope: !23) 123 !40 = !DILocation(line: 7, column: 5, scope: !23) 124 !41 = !DILocation(line: 7, column: 3, scope: !23) 125 !42 = !DILocation(line: 8, column: 10, scope: !23) 126 !43 = !DILocation(line: 9, column: 1, scope: !23) 127 !44 = !DILocation(line: 8, column: 3, scope: !23) 128
