1; Test dwarf codegen for DILocalVariable of a byval function argument that 2; points to neither an argument nor an alloca. This kind of IR is generated by 3; SafeStack for unsafe byval arguments. 4; RUN: llc -mtriple=x86_64-unknown-unknown --experimental-debug-variable-locations=false -stop-after finalize-isel %s -o - | FileCheck %s --check-prefixes=CHECK,NORMAL 5; RUN: llc -mtriple=x86_64-unknown-unknown --experimental-debug-variable-locations -stop-after finalize-isel %s -o - | FileCheck %s --check-prefixes=CHECK,INSTRREF 6; RUN: llc --try-experimental-debuginfo-iterators -mtriple=x86_64-unknown-unknown --experimental-debug-variable-locations=false -stop-after finalize-isel %s -o - | FileCheck %s --check-prefixes=CHECK,NORMAL 7; RUN: llc --try-experimental-debuginfo-iterators -mtriple=x86_64-unknown-unknown --experimental-debug-variable-locations -stop-after finalize-isel %s -o - | FileCheck %s --check-prefixes=CHECK,INSTRREF 8 9; This was built by compiling the following source with SafeStack and 10; simplifying the result a little. 11; struct S { 12; int a[100]; 13; }; 14; 15; int f(S zzz, unsigned long len) { 16; return zzz.a[len]; 17; } 18 19; CHECK: ![[ZZZ:.*]] = !DILocalVariable(name: "zzz", 20; NORMAL: DBG_VALUE {{.*}} ![[ZZZ]], !DIExpression(DW_OP_deref, DW_OP_constu, 400, DW_OP_minus) 21; INSTRREF: DBG_INSTR_REF ![[ZZZ]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_deref, DW_OP_constu, 400, DW_OP_minus, DW_OP_deref) 22 23%struct.S = type { [100 x i32] } 24 25@__safestack_unsafe_stack_ptr = external thread_local(initialexec) global ptr 26 27; Function Attrs: norecurse nounwind readonly safestack uwtable 28define i32 @_Z1f1Sm(ptr byval(%struct.S) nocapture readonly align 8 %zzz, i64 %len) #0 !dbg !12 { 29entry: 30 %unsafe_stack_ptr = load ptr, ptr @__safestack_unsafe_stack_ptr, !dbg !22 31 %unsafe_stack_static_top = getelementptr i8, ptr %unsafe_stack_ptr, i32 -400, !dbg !22 32 store ptr %unsafe_stack_static_top, ptr @__safestack_unsafe_stack_ptr, !dbg !22 33; !17 describes "zzz" 34 call void @llvm.dbg.declare(metadata ptr %unsafe_stack_ptr, metadata !17, metadata !23), !dbg !22 35 %0 = getelementptr i8, ptr %unsafe_stack_ptr, i32 -400, !dbg !22 36 call void @llvm.memcpy.p0.p0.i64(ptr align 8 %0, ptr align 8 %zzz, i64 400, i1 false), !dbg !24 37 tail call void @llvm.dbg.value(metadata i64 %len, metadata !18, metadata !25), !dbg !24 38 %arrayidx = getelementptr inbounds %struct.S, ptr %0, i64 0, i32 0, i64 %len, !dbg !26 39 %1 = load i32, ptr %arrayidx, align 4, !dbg !26, !tbaa !27 40 store ptr %unsafe_stack_ptr, ptr @__safestack_unsafe_stack_ptr, !dbg !31 41 ret i32 %1, !dbg !31 42} 43 44; Function Attrs: nounwind readnone 45declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 46 47; Function Attrs: nounwind readnone 48declare void @llvm.dbg.value(metadata, metadata, metadata) #1 49 50; Function Attrs: argmemonly nounwind 51declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture readonly, i64, i1) #2 52 53attributes #0 = { norecurse nounwind readonly safestack uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" } 54attributes #1 = { nounwind readnone } 55attributes #2 = { argmemonly nounwind } 56 57!llvm.dbg.cu = !{!0} 58!llvm.module.flags = !{!19, !20} 59!llvm.ident = !{!21} 60 61!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 254107) (llvm/trunk 254109)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3) 62!1 = !DIFile(filename: "../llvm/1.cc", directory: "/tmp/build") 63!2 = !{} 64!3 = !{!4} 65!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !1, line: 4, size: 3200, align: 32, elements: !5, identifier: "_ZTS1S") 66!5 = !{!6} 67!6 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !4, file: !1, line: 5, baseType: !7, size: 3200, align: 32) 68!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 3200, align: 32, elements: !9) 69!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 70!9 = !{!10} 71!10 = !DISubrange(count: 100) 72!12 = distinct !DISubprogram(name: "f", linkageName: "_Z1f1Sm", scope: !1, file: !1, line: 8, type: !13, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !16) 73!13 = !DISubroutineType(types: !14) 74!14 = !{!8, !4, !15} 75!15 = !DIBasicType(name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned) 76!16 = !{!17, !18} 77!17 = !DILocalVariable(name: "zzz", arg: 1, scope: !12, file: !1, line: 8, type: !4) 78!18 = !DILocalVariable(name: "len", arg: 2, scope: !12, file: !1, line: 8, type: !15) 79!19 = !{i32 2, !"Dwarf Version", i32 4} 80!20 = !{i32 2, !"Debug Info Version", i32 3} 81!21 = !{!"clang version 3.8.0 (trunk 254107) (llvm/trunk 254109)"} 82!22 = !DILocation(line: 8, column: 9, scope: !12) 83!23 = !DIExpression(DW_OP_deref, DW_OP_constu, 400, DW_OP_minus) 84!24 = !DILocation(line: 8, column: 28, scope: !12) 85!25 = !DIExpression() 86!26 = !DILocation(line: 9, column: 10, scope: !12) 87!27 = !{!28, !28, i64 0} 88!28 = !{!"int", !29, i64 0} 89!29 = !{!"omnipotent char", !30, i64 0} 90!30 = !{!"Simple C/C++ TBAA"} 91!31 = !DILocation(line: 9, column: 3, scope: !12) 92