114 lines
5.2 KiB
LLVM
114 lines
5.2 KiB
LLVM
; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s
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;
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; Source:
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; #define __ctx __attribute__((preserve_static_offset))
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; #define __pai __attribute__((preserve_access_index))
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;
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; struct bar {
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; int a;
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; int b;
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; } __pai;
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;
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; struct buz {
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; int _1;
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; struct bar *b;
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; } __pai __ctx;
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;
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; void foo(struct buz *p) {
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; p->b->b = 42;
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; }
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;
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;
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; Compilation flag:
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; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes \
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; -debug-info-kind=limited -o - \
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; | opt -passes=function(sroa) -S -o -
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%struct.buz = type { i32, ptr }
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%struct.bar = type { i32, i32 }
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; Function Attrs: nounwind
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define dso_local void @foo(ptr noundef %p) #0 !dbg !5 {
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entry:
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call void @llvm.dbg.value(metadata ptr %p, metadata !20, metadata !DIExpression()), !dbg !21
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%0 = call ptr @llvm.preserve.static.offset(ptr %p), !dbg !22
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%1 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.buz) %0, i32 1, i32 1), !dbg !22, !llvm.preserve.access.index !9
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%2 = load ptr, ptr %1, align 8, !dbg !22, !tbaa !23
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%3 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.bar) %2, i32 1, i32 1), !dbg !29, !llvm.preserve.access.index !15
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store i32 42, ptr %3, align 4, !dbg !30, !tbaa !31
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ret void, !dbg !33
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}
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; CHECK: define dso_local void @foo(ptr noundef %[[p:.*]]) {{.*}} {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @llvm.dbg.value
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; CHECK-NEXT: %[[v5:.*]] = call ptr (ptr, i1, i8, i8, i8, i1, ...)
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; CHECK-SAME: @llvm.bpf.getelementptr.and.load.p0
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; CHECK-SAME: (ptr readonly elementtype(%struct.buz) %[[p]],
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; CHECK-SAME: i1 false, i8 0, i8 1, i8 3, i1 true, i32 immarg 0, i32 immarg 1)
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; CHECK-SAME: #[[v6:.*]], !tbaa
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; CHECK-NEXT: %[[v8:.*]] =
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; CHECK-SAME: call ptr @llvm.preserve.struct.access.index.p0.p0
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; CHECK-SAME: (ptr elementtype(%struct.bar) %[[v5]], i32 1, i32 1),
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; CHECK-SAME: !dbg ![[#]], !llvm.preserve.access.index ![[#]]
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; CHECK-NEXT: store i32 42, ptr %[[v8]], align 4, !dbg ![[#]], !tbaa
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; CHECK-NEXT: ret void, !dbg
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; CHECK-NEXT: }
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; CHECK : attributes #[[v6]] = { memory(argmem: read) }
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; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
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declare ptr @llvm.preserve.static.offset(ptr readnone) #1
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; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none)
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declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #2
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; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
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attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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attributes #2 = { nocallback nofree nosync nounwind willreturn memory(none) }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3}
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!llvm.ident = !{!4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "some-file.c", directory: "/some/dir/")
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!2 = !{i32 2, !"Debug Info Version", i32 3}
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!3 = !{i32 1, !"wchar_size", i32 4}
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!4 = !{!"clang"}
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!5 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 14, type: !6, scopeLine: 14, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !19)
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
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!9 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "buz", file: !1, line: 9, size: 128, elements: !10)
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!10 = !{!11, !13}
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "_1", scope: !9, file: !1, line: 10, baseType: !12, size: 32)
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!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !9, file: !1, line: 11, baseType: !14, size: 64, offset: 64)
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64)
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!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "bar", file: !1, line: 4, size: 64, elements: !16)
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!16 = !{!17, !18}
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!17 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !15, file: !1, line: 5, baseType: !12, size: 32)
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!18 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !15, file: !1, line: 6, baseType: !12, size: 32, offset: 32)
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!19 = !{!20}
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!20 = !DILocalVariable(name: "p", arg: 1, scope: !5, file: !1, line: 14, type: !8)
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!21 = !DILocation(line: 0, scope: !5)
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!22 = !DILocation(line: 15, column: 6, scope: !5)
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!23 = !{!24, !28, i64 8}
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!24 = !{!"buz", !25, i64 0, !28, i64 8}
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!25 = !{!"int", !26, i64 0}
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!26 = !{!"omnipotent char", !27, i64 0}
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!27 = !{!"Simple C/C++ TBAA"}
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!28 = !{!"any pointer", !26, i64 0}
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!29 = !DILocation(line: 15, column: 9, scope: !5)
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!30 = !DILocation(line: 15, column: 11, scope: !5)
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!31 = !{!32, !25, i64 4}
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!32 = !{!"bar", !25, i64 0, !25, i64 4}
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!33 = !DILocation(line: 16, column: 1, scope: !5)
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