1 ; Test dwarf codegen of DW_OP_minus. 2 ; RUN: llc -O0 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s 3 4 ; This was built by compiling the following source with SafeStack and 5 ; simplifying the result a little. 6 ; extern "C" { 7 ; void Capture(int *); 8 ; void f() { 9 ; int buf[100]; 10 ; Capture(buf); 11 ; } 12 ; } 13 ; The interesting part is !DIExpression(DW_OP_deref, DW_OP_minus, 400) 14 15 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 16 target triple = "x86_64-unknown-linux-gnu" 17 18 @__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8* 19 20 define void @f() !dbg !4 { 21 entry: 22 %unsafe_stack_ptr = load i8*, i8** @__safestack_unsafe_stack_ptr 23 %unsafe_stack_static_top = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400 24 store i8* %unsafe_stack_static_top, i8** @__safestack_unsafe_stack_ptr 25 %0 = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400 26 %buf = bitcast i8* %0 to [100 x i32]* 27 %1 = bitcast [100 x i32]* %buf to i8*, !dbg !16 28 call void @llvm.dbg.declare(metadata i8* %unsafe_stack_ptr, metadata !8, metadata !17), !dbg !18 29 %arraydecay = getelementptr inbounds [100 x i32], [100 x i32]* %buf, i64 0, i64 0, !dbg !19 30 call void @Capture(i32* %arraydecay), !dbg !20 31 store i8* %unsafe_stack_ptr, i8** @__safestack_unsafe_stack_ptr, !dbg !21 32 ret void, !dbg !21 33 } 34 35 ; Function Attrs: nounwind readnone 36 declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone 37 38 declare void @Capture(i32*) 39 40 !llvm.dbg.cu = !{!0} 41 !llvm.module.flags = !{!13, !14} 42 43 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 248518) (llvm/trunk 248512)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 44 !1 = !DIFile(filename: "1.cc", directory: "/tmp") 45 !2 = !{} 46 !4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !5, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !7) 47 !5 = !DISubroutineType(types: !6) 48 !6 = !{null} 49 !7 = !{!8} 50 !8 = !DILocalVariable(name: "buf", scope: !4, file: !1, line: 5, type: !9) 51 !9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 3200, align: 32, elements: !11) 52 !10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 53 !11 = !{!12} 54 !12 = !DISubrange(count: 100) 55 !13 = !{i32 2, !"Dwarf Version", i32 4} 56 !14 = !{i32 2, !"Debug Info Version", i32 3} 57 !15 = !{!"clang version 3.8.0 (trunk 248518) (llvm/trunk 248512)"} 58 !16 = !DILocation(line: 5, column: 3, scope: !4) 59 !17 = !DIExpression(DW_OP_deref, DW_OP_minus, 400) 60 !18 = !DILocation(line: 5, column: 7, scope: !4) 61 !19 = !DILocation(line: 6, column: 11, scope: !4) 62 !20 = !DILocation(line: 6, column: 3, scope: !4) 63 !21 = !DILocation(line: 7, column: 1, scope: !4) 64 65 ; RCX - 400 66 ; CHECK: .short 6 # Loc expr size 67 ; CHECK-NEXT: .byte 114 # DW_OP_breg2 68 ; CHECK-NEXT: .byte 0 # 0 69 ; CHECK-NEXT: .byte 16 # DW_OP_constu 70 ; CHECK-NEXT: .byte 144 # 400 71 ; CHECK-NEXT: .byte 3 # DW_OP_minus 72 ; CHECK-NEXT: .byte 28 73 74 ; RCX is clobbered in call @Capture, but there is a spilled copy. 75 ; *(RSP + 8) - 400 76 ; CHECK: .short 7 # Loc expr size 77 ; CHECK-NEXT: .byte 119 # DW_OP_breg7 78 ; CHECK-NEXT: .byte 8 # 8 79 ; CHECK-NEXT: .byte 6 # DW_OP_deref 80 ; CHECK-NEXT: .byte 16 # DW_OP_constu 81 ; CHECK-NEXT: .byte 144 # 400 82 ; CHECK-NEXT: .byte 3 # DW_OP_minus 83 ; CHECK-NEXT: .byte 28 84
