1 ; RUN: llc -O0 -mtriple=x86_64-apple-darwin -filetype=asm %s -o - | FileCheck %s 2 ; Ensure that we generate an indirect location for the variable length array a. 3 ; CHECK: ##DEBUG_VALUE: vla:a <- [DW_OP_deref] [$rcx+0] 4 ; CHECK: DW_OP_breg2 5 ; rdar://problem/13658587 6 ; 7 ; generated from: 8 ; 9 ; int vla(int n) { 10 ; int a[n]; 11 ; a[0] = 42; 12 ; return a[n-1]; 13 ; } 14 ; 15 ; int main(int argc, char** argv) { 16 ; return vla(argc); 17 ; } 18 19 ; ModuleID = 'vla.c' 20 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 21 target triple = "x86_64-apple-macosx10.8.0" 22 23 ; Function Attrs: nounwind ssp uwtable 24 define i32 @vla(i32 %n) nounwind ssp uwtable !dbg !4 { 25 entry: 26 %n.addr = alloca i32, align 4 27 %saved_stack = alloca i8* 28 %cleanup.dest.slot = alloca i32 29 store i32 %n, i32* %n.addr, align 4 30 call void @llvm.dbg.declare(metadata i32* %n.addr, metadata !15, metadata !DIExpression()), !dbg !16 31 %0 = load i32, i32* %n.addr, align 4, !dbg !17 32 %1 = zext i32 %0 to i64, !dbg !17 33 %2 = call i8* @llvm.stacksave(), !dbg !17 34 store i8* %2, i8** %saved_stack, !dbg !17 35 %vla = alloca i32, i64 %1, align 16, !dbg !17 36 call void @llvm.dbg.declare(metadata i32* %vla, metadata !18, metadata !DIExpression(DW_OP_deref)), !dbg !17 37 %arrayidx = getelementptr inbounds i32, i32* %vla, i64 0, !dbg !22 38 store i32 42, i32* %arrayidx, align 4, !dbg !22 39 %3 = load i32, i32* %n.addr, align 4, !dbg !23 40 %sub = sub nsw i32 %3, 1, !dbg !23 41 %idxprom = sext i32 %sub to i64, !dbg !23 42 %arrayidx1 = getelementptr inbounds i32, i32* %vla, i64 %idxprom, !dbg !23 43 %4 = load i32, i32* %arrayidx1, align 4, !dbg !23 44 store i32 1, i32* %cleanup.dest.slot 45 %5 = load i8*, i8** %saved_stack, !dbg !24 46 call void @llvm.stackrestore(i8* %5), !dbg !24 47 ret i32 %4, !dbg !23 48 } 49 50 ; Function Attrs: nounwind readnone 51 declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone 52 53 ; Function Attrs: nounwind 54 declare i8* @llvm.stacksave() nounwind 55 56 ; Function Attrs: nounwind 57 declare void @llvm.stackrestore(i8*) nounwind 58 59 ; Function Attrs: nounwind ssp uwtable 60 define i32 @main(i32 %argc, i8** %argv) nounwind ssp uwtable !dbg !9 { 61 entry: 62 %retval = alloca i32, align 4 63 %argc.addr = alloca i32, align 4 64 %argv.addr = alloca i8**, align 8 65 store i32 0, i32* %retval 66 store i32 %argc, i32* %argc.addr, align 4 67 call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !25, metadata !DIExpression()), !dbg !26 68 store i8** %argv, i8*** %argv.addr, align 8 69 call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !27, metadata !DIExpression()), !dbg !26 70 %0 = load i32, i32* %argc.addr, align 4, !dbg !28 71 %call = call i32 @vla(i32 %0), !dbg !28 72 ret i32 %call, !dbg !28 73 } 74 75 !llvm.dbg.cu = !{!0} 76 !llvm.module.flags = !{!29} 77 78 !0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2) 79 !1 = !DIFile(filename: "vla.c", directory: "") 80 !2 = !{} 81 !4 = distinct !DISubprogram(name: "vla", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2) 82 !5 = !DIFile(filename: "vla.c", directory: "") 83 !6 = !DISubroutineType(types: !7) 84 !7 = !{!8, !8} 85 !8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 86 !9 = distinct !DISubprogram(name: "main", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !10, retainedNodes: !2) 87 !10 = !DISubroutineType(types: !11) 88 !11 = !{!8, !8, !12} 89 !12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !13) 90 !13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !14) 91 !14 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char) 92 !15 = !DILocalVariable(name: "n", line: 1, arg: 1, scope: !4, file: !5, type: !8) 93 !16 = !DILocation(line: 1, scope: !4) 94 !17 = !DILocation(line: 2, scope: !4) 95 !18 = !DILocalVariable(name: "a", line: 2, scope: !4, file: !5, type: !19) 96 !19 = !DICompositeType(tag: DW_TAG_array_type, align: 32, baseType: !8, elements: !20) 97 !20 = !{!21} 98 !21 = !DISubrange(count: -1) 99 !22 = !DILocation(line: 3, scope: !4) 100 !23 = !DILocation(line: 4, scope: !4) 101 !24 = !DILocation(line: 5, scope: !4) 102 !25 = !DILocalVariable(name: "argc", line: 7, arg: 1, scope: !9, file: !5, type: !8) 103 !26 = !DILocation(line: 7, scope: !9) 104 !27 = !DILocalVariable(name: "argv", line: 7, arg: 2, scope: !9, file: !5, type: !12) 105 !28 = !DILocation(line: 8, scope: !9) 106 !29 = !{i32 1, !"Debug Info Version", i32 3} 107
