83 lines
4.2 KiB
LLVM
83 lines
4.2 KiB
LLVM
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; RUN: llc -march=bpf < %s | FileCheck %s
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;
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; The IR is generated from a bpftrace script (https://github.com/iovisor/bpftrace/issues/1305)
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; and then slightly adapted for easy unit testing.
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; The llvm bugzilla link: https://bugs.llvm.org/show_bug.cgi?id=47591
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%printf_t = type { i64, i64 }
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define i64 @"kprobe:blk_update_request"(i8* %0) local_unnamed_addr section "s_kprobe:blk_update_request_1" {
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entry:
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%"struct kernfs_node.parent" = alloca i64, align 8
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%printf_args = alloca %printf_t, align 8
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%"struct cgroup.kn" = alloca i64, align 8
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%"struct cgroup_subsys_state.cgroup" = alloca i64, align 8
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%"struct blkcg_gq.blkcg" = alloca i64, align 8
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%"struct bio.bi_blkg" = alloca i64, align 8
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%"struct request.bio" = alloca i64, align 8
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%1 = getelementptr i8, i8* %0, i64 112
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%2 = bitcast i8* %1 to i64*
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%arg0 = load volatile i64, i64* %2, align 8
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%3 = add i64 %arg0, 56
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%4 = bitcast i64* %"struct request.bio" to i8*
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %4)
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%probe_read = call i64 inttoptr (i64 4 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct request.bio", i32 8, i64 %3)
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%5 = load i64, i64* %"struct request.bio", align 8
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %4)
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%6 = add i64 %5, 72
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%7 = bitcast i64* %"struct bio.bi_blkg" to i8*
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %7)
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%probe_read1 = call i64 inttoptr (i64 5 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct bio.bi_blkg", i32 8, i64 %6)
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%8 = load i64, i64* %"struct bio.bi_blkg", align 8
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %7)
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%9 = add i64 %8, 40
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%10 = bitcast i64* %"struct blkcg_gq.blkcg" to i8*
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %10)
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%probe_read2 = call i64 inttoptr (i64 6 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct blkcg_gq.blkcg", i32 8, i64 %9)
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%11 = load i64, i64* %"struct blkcg_gq.blkcg", align 8
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %10)
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%12 = bitcast i64* %"struct cgroup_subsys_state.cgroup" to i8*
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %12)
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%probe_read3 = call i64 inttoptr (i64 7 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct cgroup_subsys_state.cgroup", i32 8, i64 %11)
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%13 = load i64, i64* %"struct cgroup_subsys_state.cgroup", align 8
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %12)
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%14 = add i64 %13, 288
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%15 = bitcast i64* %"struct cgroup.kn" to i8*
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %15)
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%probe_read4 = call i64 inttoptr (i64 8 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct cgroup.kn", i32 8, i64 %14)
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%16 = load i64, i64* %"struct cgroup.kn", align 8
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %15)
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%17 = bitcast %printf_t* %printf_args to i8*
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %17)
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%18 = add i64 %16, 8
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%19 = bitcast i64* %"struct kernfs_node.parent" to i8*
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%20 = getelementptr inbounds %printf_t, %printf_t* %printf_args, i64 0, i32 0
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store i64 0, i64* %20, align 8
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %19)
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; CHECK: call 8
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; CHECK-NOT: r{{[0-9]+}} = 0
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; CHECK: [[REG3:r[0-9]+]] = *(u64 *)(r10 - 24)
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; CHECK: [[REG1:r[0-9]+]] = 0
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; CHECK: *(u64 *)(r10 - 24) = [[REG1]]
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%probe_read5 = call i64 inttoptr (i64 9 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct kernfs_node.parent", i32 8, i64 %18)
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%21 = load i64, i64* %"struct kernfs_node.parent", align 8
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %19)
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%22 = getelementptr inbounds %printf_t, %printf_t* %printf_args, i64 0, i32 1
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store i64 %21, i64* %22, align 8
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%get_cpu_id = call i64 inttoptr (i64 18 to i64 ()*)()
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%perf_event_output = call i64 inttoptr (i64 10 to i64 (i8*, i64, i64, %printf_t*, i64)*)(i8* %0, i64 2, i64 %get_cpu_id, %printf_t* nonnull %printf_args, i64 16)
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %17)
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ret i64 0
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}
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.start.p0i8(i64 immarg %0, i8* nocapture %1) #1
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.end.p0i8(i64 immarg %0, i8* nocapture %1) #1
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attributes #0 = { nounwind }
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attributes #1 = { argmemonly nounwind willreturn }
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