1; RUN: opt < %s -passes=asan -asan-use-after-return=never -S | \ 2; RUN: llc -O0 -filetype=obj - -o - | \ 3; RUN: llvm-dwarfdump - | FileCheck %s 4 5; RUN: opt --try-experimental-debuginfo-iterators < %s -passes=asan -asan-use-after-return=never -S | \ 6; RUN: llc --try-experimental-debuginfo-iterators -O0 -filetype=obj - -o - | \ 7; RUN: llvm-dwarfdump - | FileCheck %s 8 9; For this test case, ASan used to produce IR which resulted in the following 10; DWARF (at -O0): 11; 12; DW_TAG_subprogram 13; DW_AT_low_pc (0x0000000000000000) 14; DW_AT_high_pc (0x00000000000000f1) 15; 16; DW_TAG_variable 17; DW_AT_location (0x00000000 18; [0x0000000000000014, 0x000000000000006d): DW_OP_breg0 RAX+32 19; [0x000000000000006d, 0x00000000000000a4): DW_OP_breg7 RSP+16, DW_OP_deref, DW_OP_plus_uconst 0x20 20; [0x00000000000000a6, 0x00000000000000ef): DW_OP_breg7 RSP+16, DW_OP_deref, DW_OP_plus_uconst 0x20) 21; 22; The DWARF produced for the original ObjC code that motivated this test case 23; was actually not as nice! In that example, the location list ranges didn't 24; intersect with the ranges of the parent lexical scope. But recreating that 25; exactly requires playing tricks to get LiveDebugValue's lexical dominance 26; check to kill a variable range early, and it isn't strictly necessary to show 27; the problem here. 28; 29; The problem is that we shouldn't get a location list at all. The instruction 30; selector should recognize that we have an "alloca" in the entry block, and 31; just make the fixed location available in the whole function. We now produce 32; the correct DWARF, namely: 33 34; CHECK: DW_TAG_variable 35; CHECK-NEXT: DW_AT_location (DW_OP_breg7 RSP+32, DW_OP_plus_uconst 0x20) 36 37target triple = "x86_64-apple-macosx10.10.0" 38 39declare void @escape(ptr) 40 41; Function Attrs: sanitize_address 42define ptr @foo(i1 %cond) #0 !dbg !6 { 43entry: 44 %a1 = alloca ptr, !dbg !12 45 call void @escape(ptr %a1), !dbg !13 46 br i1 %cond, label %l1, label %l2, !dbg !14 47 48l1: ; preds = %entry 49 ret ptr null, !dbg !15 50 51l2: ; preds = %entry 52 call void @llvm.dbg.declare(metadata ptr %a1, metadata !11, metadata !DIExpression()), !dbg !16 53 %p = load ptr, ptr %a1, !dbg !16 54 ret ptr %p, !dbg !17 55} 56 57declare void @llvm.dbg.declare(metadata, metadata, metadata) 58 59attributes #0 = { sanitize_address } 60 61!llvm.dbg.cu = !{!0} 62!llvm.debugify = !{!3, !4} 63!llvm.module.flags = !{!5} 64 65!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 66!1 = !DIFile(filename: "redu.ll", directory: "/") 67!2 = !{} 68!3 = !{i32 6} 69!4 = !{i32 2} 70!5 = !{i32 2, !"Debug Info Version", i32 3} 71!6 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: null, file: !1, line: 1, type: !7, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8) 72!7 = !DISubroutineType(types: !2) 73!8 = !{!11} 74!10 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_unsigned) 75!11 = !DILocalVariable(name: "2", scope: !6, file: !1, line: 5, type: !10) 76!12 = !DILocation(line: 1, column: 1, scope: !6) 77!13 = !DILocation(line: 2, column: 1, scope: !6) 78!14 = !DILocation(line: 3, column: 1, scope: !6) 79!15 = !DILocation(line: 4, column: 1, scope: !6) 80!16 = !DILocation(line: 5, column: 1, scope: !6) 81!17 = !DILocation(line: 6, column: 1, scope: !6) 82