clang/test/CodeGen/attr-counted-by-pr110385.c

// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 4
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O2 -Wno-missing-declarations -emit-llvm -o - %s | FileCheck %s

// See #110385
// Based on reproducer from Kees Cook:
// https://lore.kernel.org/all/202409170436.C3C6E7F7A@keescook/

struct variable {
        int a;
        int b;
        int length;
        short array[] __attribute__((counted_by(length)));
};

struct bucket {
        int a;
        struct variable *growable;
        int b;
};

struct bucket2 {
        int a;
        struct variable growable;
};

void init(void * __attribute__((pass_dynamic_object_size(0))));

// CHECK-LABEL: define dso_local void @test1(
// CHECK-SAME: ptr noundef readonly captures(none) [[FOO:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
// CHECK-NEXT:  entry:
// CHECK-NEXT:    [[GROWABLE:%.*]] = getelementptr inbounds nuw i8, ptr [[FOO]], i64 8
// CHECK-NEXT:    [[TMP0:%.*]] = load ptr, ptr [[GROWABLE]], align 8, !tbaa [[TBAA2:![0-9]+]]
// CHECK-NEXT:    [[ARRAY:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP0]], i64 12
// CHECK-NEXT:    [[COUNTED_BY_GEP:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP0]], i64 8
// CHECK-NEXT:    [[COUNTED_BY_LOAD:%.*]] = load i32, ptr [[COUNTED_BY_GEP]], align 4
// CHECK-NEXT:    [[TMP1:%.*]] = sext i32 [[COUNTED_BY_LOAD]] to i64
// CHECK-NEXT:    [[TMP2:%.*]] = shl nsw i64 [[TMP1]], 1
// CHECK-NEXT:    [[TMP3:%.*]] = icmp sgt i32 [[COUNTED_BY_LOAD]], -1
// CHECK-NEXT:    [[TMP4:%.*]] = select i1 [[TMP3]], i64 [[TMP2]], i64 0
// CHECK-NEXT:    tail call void @init(ptr noundef nonnull [[ARRAY]], i64 noundef [[TMP4]]) #[[ATTR2:[0-9]+]]
// CHECK-NEXT:    ret void
//
void test1(struct bucket *foo) {
        init(foo->growable->array);
}

// CHECK-LABEL: define dso_local void @test2(
// CHECK-SAME: ptr noundef [[FOO:%.*]]) local_unnamed_addr #[[ATTR0]] {
// CHECK-NEXT:  entry:
// CHECK-NEXT:    [[ARRAY:%.*]] = getelementptr inbounds nuw i8, ptr [[FOO]], i64 16
// CHECK-NEXT:    [[COUNTED_BY_GEP:%.*]] = getelementptr inbounds nuw i8, ptr [[FOO]], i64 12
// CHECK-NEXT:    [[COUNTED_BY_LOAD:%.*]] = load i32, ptr [[COUNTED_BY_GEP]], align 4
// CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[COUNTED_BY_LOAD]] to i64
// CHECK-NEXT:    [[TMP1:%.*]] = shl nsw i64 [[TMP0]], 1
// CHECK-NEXT:    [[TMP2:%.*]] = icmp sgt i32 [[COUNTED_BY_LOAD]], -1
// CHECK-NEXT:    [[TMP3:%.*]] = select i1 [[TMP2]], i64 [[TMP1]], i64 0
// CHECK-NEXT:    tail call void @init(ptr noundef nonnull [[ARRAY]], i64 noundef [[TMP3]]) #[[ATTR2]]
// CHECK-NEXT:    ret void
//
void test2(struct bucket2 *foo) {
        init(foo->growable.array);
}
//.
// CHECK: [[TBAA2]] = !{[[META3:![0-9]+]], [[META7:![0-9]+]], i64 8}
// CHECK: [[META3]] = !{!"bucket", [[META4:![0-9]+]], i64 0, [[META7]], i64 8, [[META4]], i64 16}
// CHECK: [[META4]] = !{!"int", [[META5:![0-9]+]], i64 0}
// CHECK: [[META5]] = !{!"omnipotent char", [[META6:![0-9]+]], i64 0}
// CHECK: [[META6]] = !{!"Simple C/C++ TBAA"}
// CHECK: [[META7]] = !{!"p1 _ZTS8variable", [[META8:![0-9]+]], i64 0}
// CHECK: [[META8]] = !{!"any pointer", [[META5]], i64 0}
//.