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 -stop-after expand-isel-pseudos %s -o - | FileCheck %s 5 6; This was built by compiling the following source with SafeStack and 7; simplifying the result a little. 8; struct S { 9; int a[100]; 10; }; 11; 12; int f(S zzz, unsigned long len) { 13; return zzz.a[len]; 14; } 15 16; CHECK: ![[ZZZ:.*]] = !DILocalVariable(name: "zzz", 17; CHECK: ![[ZZZ_EXPR:.*]] = !DIExpression(DW_OP_deref, DW_OP_minus, 400) 18; CHECK: DBG_VALUE {{.*}} ![[ZZZ]], ![[ZZZ_EXPR]] 19 20%struct.S = type { [100 x i32] } 21 22@__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8* 23 24; Function Attrs: norecurse nounwind readonly safestack uwtable 25define i32 @_Z1f1Sm(%struct.S* byval nocapture readonly align 8 %zzz, i64 %len) #0 !dbg !12 { 26entry: 27 %unsafe_stack_ptr = load i8*, i8** @__safestack_unsafe_stack_ptr, !dbg !22 28 %unsafe_stack_static_top = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400, !dbg !22 29 store i8* %unsafe_stack_static_top, i8** @__safestack_unsafe_stack_ptr, !dbg !22 30; !17 describes "zzz" 31 call void @llvm.dbg.declare(metadata i8* %unsafe_stack_ptr, metadata !17, metadata !23), !dbg !22 32 %0 = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400, !dbg !22 33 %zzz.unsafe-byval = bitcast i8* %0 to %struct.S*, !dbg !22 34 %1 = bitcast %struct.S* %zzz to i8*, !dbg !24 35 call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 400, i32 8, i1 false), !dbg !24 36 tail call void @llvm.dbg.value(metadata i64 %len, i64 0, metadata !18, metadata !25), !dbg !24 37 %arrayidx = getelementptr inbounds %struct.S, %struct.S* %zzz.unsafe-byval, i64 0, i32 0, i64 %len, !dbg !26 38 %2 = load i32, i32* %arrayidx, align 4, !dbg !26, !tbaa !27 39 store i8* %unsafe_stack_ptr, i8** @__safestack_unsafe_stack_ptr, !dbg !31 40 ret i32 %2, !dbg !31 41} 42 43; Function Attrs: nounwind readnone 44declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 45 46; Function Attrs: nounwind readnone 47declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1 48 49; Function Attrs: argmemonly nounwind 50declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #2 51 52attributes #0 = { norecurse nounwind readonly safestack uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "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" } 53attributes #1 = { nounwind readnone } 54attributes #2 = { argmemonly nounwind } 55 56!llvm.dbg.cu = !{!0} 57!llvm.module.flags = !{!19, !20} 58!llvm.ident = !{!21} 59 60!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) 61!1 = !DIFile(filename: "../llvm/1.cc", directory: "/tmp/build") 62!2 = !{} 63!3 = !{!4} 64!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !1, line: 4, size: 3200, align: 32, elements: !5, identifier: "_ZTS1S") 65!5 = !{!6} 66!6 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !4, file: !1, line: 5, baseType: !7, size: 3200, align: 32) 67!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 3200, align: 32, elements: !9) 68!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 69!9 = !{!10} 70!10 = !DISubrange(count: 100) 71!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, variables: !16) 72!13 = !DISubroutineType(types: !14) 73!14 = !{!8, !4, !15} 74!15 = !DIBasicType(name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned) 75!16 = !{!17, !18} 76!17 = !DILocalVariable(name: "zzz", arg: 1, scope: !12, file: !1, line: 8, type: !4) 77!18 = !DILocalVariable(name: "len", arg: 2, scope: !12, file: !1, line: 8, type: !15) 78!19 = !{i32 2, !"Dwarf Version", i32 4} 79!20 = !{i32 2, !"Debug Info Version", i32 3} 80!21 = !{!"clang version 3.8.0 (trunk 254107) (llvm/trunk 254109)"} 81!22 = !DILocation(line: 8, column: 9, scope: !12) 82!23 = !DIExpression(DW_OP_deref, DW_OP_minus, 400) 83!24 = !DILocation(line: 8, column: 28, scope: !12) 84!25 = !DIExpression() 85!26 = !DILocation(line: 9, column: 10, scope: !12) 86!27 = !{!28, !28, i64 0} 87!28 = !{!"int", !29, i64 0} 88!29 = !{!"omnipotent char", !30, i64 0} 89!30 = !{!"Simple C/C++ TBAA"} 90!31 = !DILocation(line: 9, column: 3, scope: !12) 91