Index: docs/LangRef.rst =================================================================== --- docs/LangRef.rst +++ docs/LangRef.rst @@ -17325,7 +17325,7 @@ """"""" :: - declare + declare @llvm.preserve.array.access.index.p0s_union.anons.p0a10s_union.anons( base, i32 dim, i32 index) @@ -17335,7 +17335,9 @@ The '``llvm.preserve.array.access.index``' intrinsic returns the getelementptr address based on array base ``base``, array dimension ``dim`` and the last access index ``index`` -into the array. +into the array. The return type ``ret_type`` is a pointer type to the array element. +The array ``dim`` and ``index`` are preserved which is more robust than +getelementptr instruction which may be subject to compiler transformation. Arguments: """""""""" @@ -17368,6 +17370,8 @@ ``di_index`` and returns the ``base`` address. The ``llvm.preserve.access.index`` type of metadata is attached to this call instruction to provide union debuginfo type. +The metadata is a ``DICompositeType`` representing the debuginfo version of ``type``. +The return type ``type`` is the same as the ``base`` type. Arguments: """""""""" @@ -17386,7 +17390,7 @@ """"""" :: - declare + declare @llvm.preserve.struct.access.index.p0i8.p0s_struct.anon.0s( base, i32 gep_index, i32 di_index) @@ -17398,6 +17402,8 @@ based on struct base ``base`` and IR struct member index ``gep_index``. The ``llvm.preserve.access.index`` type of metadata is attached to this call instruction to provide struct debuginfo type. +The metadata is a ``DICompositeType`` representing the debuginfo version of ``type``. +The return type ``ret_type`` is a pointer type to the structure member. Arguments: """""""""" Index: test/CodeGen/BPF/CORE/intrinsic-array.ll =================================================================== --- /dev/null +++ test/CodeGen/BPF/CORE/intrinsic-array.ll @@ -0,0 +1,80 @@ +; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck %s +; +; Source code: +; #define _(x) (__builtin_preserve_access_index(x)) +; struct s { int a; int b; }; +; int get_value(const void *addr); +; int test(struct s *arg) { return get_value(_(&arg[2].b)); } +; Compiler flag to generate IR: +; clang -target bpf -S -O2 -g -emit-llvm test.c + +%struct.s = type { i32, i32 } + +; Function Attrs: nounwind +define dso_local i32 @test(%struct.s* %arg) local_unnamed_addr #0 !dbg !7 { +entry: + call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !17, metadata !DIExpression()), !dbg !18 + %0 = tail call %struct.s* @llvm.preserve.array.access.index.p0s_struct.ss.p0s_struct.ss(%struct.s* %arg, i32 0, i32 2), !dbg !19 + %1 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.ss(%struct.s* %0, i32 1, i32 1), !dbg !19, !llvm.preserve.access.index !12 + %2 = bitcast i32* %1 to i8*, !dbg !19 + %call = tail call i32 @get_value(i8* %2) #4, !dbg !20 + ret i32 %call, !dbg !21 +} +; CHECK-LABEL: test +; CHECK: [[RELOC:.Ltmp[0-9]+]] +; CHECK: r2 = 20 +; CHECK: r1 += r2 +; CHECK: call get_value +; CHECK: exit +; +; CHECK: .section .BTF.ext,"",@progbits +; CHECK: .long 12 # OffsetReloc +; CHECK-NEXT: .long 20 # Offset reloc section string offset=20 +; CHECK-NEXT: .long 1 +; CHECK-NEXT: .long [[RELOC]] +; CHECK-NEXT: .long 2 +; CHECK-NEXT: .long 26 + +declare dso_local i32 @get_value(i8*) local_unnamed_addr #1 + +; Function Attrs: nounwind readnone +declare %struct.s* @llvm.preserve.array.access.index.p0s_struct.ss.p0s_struct.ss(%struct.s*, i32 immarg, i32 immarg) #2 + +; Function Attrs: nounwind readnone +declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.ss(%struct.s*, i32 immarg, i32 immarg) #2 + +; Function Attrs: nounwind readnone speculatable +declare void @llvm.dbg.value(metadata, metadata, metadata) #3 + +attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } +attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } +attributes #2 = { nounwind readnone } +attributes #3 = { nounwind readnone speculatable } +attributes #4 = { nounwind } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4, !5} +!llvm.ident = !{!6} + +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (trunk 365789)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None) +!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{i32 1, !"wchar_size", i32 4} +!6 = !{!"clang version 9.0.0 (trunk 365789)"} +!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !8, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16) +!8 = !DISubroutineType(types: !9) +!9 = !{!10, !11} +!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) +!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64) +!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 2, size: 64, elements: !13) +!13 = !{!14, !15} +!14 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !12, file: !1, line: 2, baseType: !10, size: 32) +!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !12, file: !1, line: 2, baseType: !10, size: 32, offset: 32) +!16 = !{!17} +!17 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 4, type: !11) +!18 = !DILocation(line: 0, scope: !7) +!19 = !DILocation(line: 4, column: 44, scope: !7) +!20 = !DILocation(line: 4, column: 34, scope: !7) +!21 = !DILocation(line: 4, column: 27, scope: !7) Index: test/CodeGen/BPF/CORE/intrinsic-struct.ll =================================================================== --- /dev/null +++ test/CodeGen/BPF/CORE/intrinsic-struct.ll @@ -0,0 +1,77 @@ +; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck %s +; +; Source code: +; struct s { int a; int b; }; +; #define _(x) (__builtin_preserve_access_index(x)) +; int get_value(const void *addr); +; int test(struct s *arg) { return get_value(_(&arg->b)); } +; Compiler flag to generate IR: +; clang -target bpf -S -O2 -g -emit-llvm test.c + +%struct.s = type { i32, i32 } + +; Function Attrs: nounwind +define dso_local i32 @test(%struct.s* %arg) local_unnamed_addr #0 !dbg !7 { +entry: + call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !17, metadata !DIExpression()), !dbg !18 + %0 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.ss(%struct.s* %arg, i32 1, i32 1), !dbg !19, !llvm.preserve.access.index !12 + %1 = bitcast i32* %0 to i8*, !dbg !19 + %call = tail call i32 @get_value(i8* %1) #4, !dbg !20 + ret i32 %call, !dbg !21 +} + +; CHECK-LABEL: test +; CHECK: [[RELOC:.Ltmp[0-9]+]] +; CHECK: r2 = 4 +; CHECK: r1 += r2 +; CHECK: call get_value +; CHECK: exit +; +; CHECK: .section .BTF.ext,"",@progbits +; CHECK: .long 12 # OffsetReloc +; CHECK-NEXT: .long 20 # Offset reloc section string offset=20 +; CHECK-NEXT: .long 1 +; CHECK-NEXT: .long [[RELOC]] +; CHECK-NEXT: .long 2 +; CHECK-NEXT: .long 26 + +declare dso_local i32 @get_value(i8*) local_unnamed_addr #1 + +; Function Attrs: nounwind readnone +declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.ss(%struct.s*, i32 immarg, i32 immarg) #2 + +; Function Attrs: nounwind readnone speculatable +declare void @llvm.dbg.value(metadata, metadata, metadata) #3 + +attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } +attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } +attributes #2 = { nounwind readnone } +attributes #3 = { nounwind readnone speculatable } +attributes #4 = { nounwind } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4, !5} +!llvm.ident = !{!6} + +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (trunk 365789)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None) +!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{i32 1, !"wchar_size", i32 4} +!6 = !{!"clang version 9.0.0 (trunk 365789)"} +!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !8, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16) +!8 = !DISubroutineType(types: !9) +!9 = !{!10, !11} +!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) +!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64) +!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 64, elements: !13) +!13 = !{!14, !15} +!14 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !12, file: !1, line: 1, baseType: !10, size: 32) +!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !12, file: !1, line: 1, baseType: !10, size: 32, offset: 32) +!16 = !{!17} +!17 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 4, type: !11) +!18 = !DILocation(line: 0, scope: !7) +!19 = !DILocation(line: 4, column: 44, scope: !7) +!20 = !DILocation(line: 4, column: 34, scope: !7) +!21 = !DILocation(line: 4, column: 27, scope: !7) Index: test/CodeGen/BPF/CORE/intrinsic-union.ll =================================================================== --- /dev/null +++ test/CodeGen/BPF/CORE/intrinsic-union.ll @@ -0,0 +1,76 @@ +; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck %s +; +; Source code: +; union u { int a; int b; }; +; #define _(x) (__builtin_preserve_access_index(x)) +; int get_value(const void *addr); +; int test(union u *arg) { return get_value(_(&arg->b)); } +; Compiler flag to generate IR: +; clang -target bpf -S -O2 -g -emit-llvm test.c + +%union.u = type { i32 } + +; Function Attrs: nounwind +define dso_local i32 @test(%union.u* %arg) local_unnamed_addr #0 !dbg !7 { +entry: + call void @llvm.dbg.value(metadata %union.u* %arg, metadata !17, metadata !DIExpression()), !dbg !18 + %0 = tail call %union.u* @llvm.preserve.union.access.index.p0s_union.us.p0s_union.us(%union.u* %arg, i32 1), !dbg !19, !llvm.preserve.access.index !12 + %1 = bitcast %union.u* %0 to i8*, !dbg !19 + %call = tail call i32 @get_value(i8* %1) #4, !dbg !20 + ret i32 %call, !dbg !21 +} +; CHECK-LABEL: test +; CHECK: [[RELOC:.Ltmp[0-9]+]] +; CHECK: r2 = 0 +; CHECK: r1 += r2 +; CHECK: call get_value +; CHECK: exit + +; CHECK: .section .BTF.ext,"",@progbits +; CHECK: .long 12 # OffsetReloc +; CHECK-NEXT: .long 20 # Offset reloc section string offset=20 +; CHECK-NEXT: .long 1 +; CHECK-NEXT: .long [[RELOC]] +; CHECK-NEXT: .long 2 +; CHECK-NEXT: .long 26 + +declare dso_local i32 @get_value(i8*) local_unnamed_addr #1 + +; Function Attrs: nounwind readnone +declare %union.u* @llvm.preserve.union.access.index.p0s_union.us.p0s_union.us(%union.u*, i32 immarg) #2 + +; Function Attrs: nounwind readnone speculatable +declare void @llvm.dbg.value(metadata, metadata, metadata) #3 + +attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } +attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } +attributes #2 = { nounwind readnone } +attributes #3 = { nounwind readnone speculatable } +attributes #4 = { nounwind } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4, !5} +!llvm.ident = !{!6} + +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (trunk 365789)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None) +!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{i32 1, !"wchar_size", i32 4} +!6 = !{!"clang version 9.0.0 (trunk 365789)"} +!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !8, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16) +!8 = !DISubroutineType(types: !9) +!9 = !{!10, !11} +!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) +!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64) +!12 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "u", file: !1, line: 1, size: 32, elements: !13) +!13 = !{!14, !15} +!14 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !12, file: !1, line: 1, baseType: !10, size: 32) +!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !12, file: !1, line: 1, baseType: !10, size: 32) +!16 = !{!17} +!17 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 4, type: !11) +!18 = !DILocation(line: 0, scope: !7) +!19 = !DILocation(line: 4, column: 43, scope: !7) +!20 = !DILocation(line: 4, column: 33, scope: !7) +!21 = !DILocation(line: 4, column: 26, scope: !7)