| ; Test dwarf codegen for DILocalVariable of a byval function argument that |
| ; points to neither an argument nor an alloca. This kind of IR is generated by |
| ; SafeStack for unsafe byval arguments. |
| ; RUN: llc -mtriple=x86_64-unknown-unknown --experimental-debug-variable-locations=false -stop-after finalize-isel %s -o - | FileCheck %s --check-prefixes=CHECK,NORMAL |
| ; RUN: llc -mtriple=x86_64-unknown-unknown --experimental-debug-variable-locations -stop-after finalize-isel %s -o - | FileCheck %s --check-prefixes=CHECK,INSTRREF |
| |
| ; This was built by compiling the following source with SafeStack and |
| ; simplifying the result a little. |
| ; struct S { |
| ; int a[100]; |
| ; }; |
| ; |
| ; int f(S zzz, unsigned long len) { |
| ; return zzz.a[len]; |
| ; } |
| |
| ; CHECK: ![[ZZZ:.*]] = !DILocalVariable(name: "zzz", |
| ; NORMAL: DBG_VALUE {{.*}} ![[ZZZ]], !DIExpression(DW_OP_deref, DW_OP_constu, 400, DW_OP_minus) |
| ; INSTRREF: DBG_INSTR_REF ![[ZZZ]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_deref, DW_OP_constu, 400, DW_OP_minus, DW_OP_deref) |
| |
| %struct.S = type { [100 x i32] } |
| |
| @__safestack_unsafe_stack_ptr = external thread_local(initialexec) global ptr |
| |
| ; Function Attrs: norecurse nounwind readonly safestack uwtable |
| define i32 @_Z1f1Sm(ptr byval(%struct.S) nocapture readonly align 8 %zzz, i64 %len) #0 !dbg !12 { |
| entry: |
| %unsafe_stack_ptr = load ptr, ptr @__safestack_unsafe_stack_ptr, !dbg !22 |
| %unsafe_stack_static_top = getelementptr i8, ptr %unsafe_stack_ptr, i32 -400, !dbg !22 |
| store ptr %unsafe_stack_static_top, ptr @__safestack_unsafe_stack_ptr, !dbg !22 |
| ; !17 describes "zzz" |
| call void @llvm.dbg.declare(metadata ptr %unsafe_stack_ptr, metadata !17, metadata !23), !dbg !22 |
| %0 = getelementptr i8, ptr %unsafe_stack_ptr, i32 -400, !dbg !22 |
| call void @llvm.memcpy.p0.p0.i64(ptr align 8 %0, ptr align 8 %zzz, i64 400, i1 false), !dbg !24 |
| tail call void @llvm.dbg.value(metadata i64 %len, metadata !18, metadata !25), !dbg !24 |
| %arrayidx = getelementptr inbounds %struct.S, ptr %0, i64 0, i32 0, i64 %len, !dbg !26 |
| %1 = load i32, ptr %arrayidx, align 4, !dbg !26, !tbaa !27 |
| store ptr %unsafe_stack_ptr, ptr @__safestack_unsafe_stack_ptr, !dbg !31 |
| ret i32 %1, !dbg !31 |
| } |
| |
| ; Function Attrs: nounwind readnone |
| declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 |
| |
| ; Function Attrs: nounwind readnone |
| declare void @llvm.dbg.value(metadata, metadata, metadata) #1 |
| |
| ; Function Attrs: argmemonly nounwind |
| declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture readonly, i64, i1) #2 |
| |
| attributes #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" } |
| attributes #1 = { nounwind readnone } |
| attributes #2 = { argmemonly nounwind } |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!19, !20} |
| !llvm.ident = !{!21} |
| |
| !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) |
| !1 = !DIFile(filename: "../llvm/1.cc", directory: "/tmp/build") |
| !2 = !{} |
| !3 = !{!4} |
| !4 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !1, line: 4, size: 3200, align: 32, elements: !5, identifier: "_ZTS1S") |
| !5 = !{!6} |
| !6 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !4, file: !1, line: 5, baseType: !7, size: 3200, align: 32) |
| !7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 3200, align: 32, elements: !9) |
| !8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) |
| !9 = !{!10} |
| !10 = !DISubrange(count: 100) |
| !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) |
| !13 = !DISubroutineType(types: !14) |
| !14 = !{!8, !4, !15} |
| !15 = !DIBasicType(name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned) |
| !16 = !{!17, !18} |
| !17 = !DILocalVariable(name: "zzz", arg: 1, scope: !12, file: !1, line: 8, type: !4) |
| !18 = !DILocalVariable(name: "len", arg: 2, scope: !12, file: !1, line: 8, type: !15) |
| !19 = !{i32 2, !"Dwarf Version", i32 4} |
| !20 = !{i32 2, !"Debug Info Version", i32 3} |
| !21 = !{!"clang version 3.8.0 (trunk 254107) (llvm/trunk 254109)"} |
| !22 = !DILocation(line: 8, column: 9, scope: !12) |
| !23 = !DIExpression(DW_OP_deref, DW_OP_constu, 400, DW_OP_minus) |
| !24 = !DILocation(line: 8, column: 28, scope: !12) |
| !25 = !DIExpression() |
| !26 = !DILocation(line: 9, column: 10, scope: !12) |
| !27 = !{!28, !28, i64 0} |
| !28 = !{!"int", !29, i64 0} |
| !29 = !{!"omnipotent char", !30, i64 0} |
| !30 = !{!"Simple C/C++ TBAA"} |
| !31 = !DILocation(line: 9, column: 3, scope: !12) |