1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ART_RUNTIME_STRING_BUILDER_APPEND_H_
18 #define ART_RUNTIME_STRING_BUILDER_APPEND_H_
19 
20 #include <stddef.h>
21 #include <stdint.h>
22 
23 #include "base/bit_utils.h"
24 #include "base/locks.h"
25 #include "base/macros.h"
26 #include "obj_ptr.h"
27 
28 namespace art HIDDEN {
29 
30 class Thread;
31 
32 namespace mirror {
33 class String;
34 }  // namespace mirror
35 
36 class StringBuilderAppend {
37  public:
38   enum class Argument : uint8_t {
39     kEnd = 0u,
40     kObject,
41     kStringBuilder,
42     kString,
43     kCharArray,
44     kBoolean,
45     kChar,
46     kInt,
47     kLong,
48     kFloat,
49     kDouble,
50     kLast = kDouble
51   };
52 
53   static constexpr size_t kBitsPerArg =
54       MinimumBitsToStore(static_cast<size_t>(Argument::kLast));
55   static constexpr size_t kMaxArgs = BitSizeOf<uint32_t>() / kBitsPerArg;
56   static_assert(kMaxArgs * kBitsPerArg == BitSizeOf<uint32_t>(), "Expecting no extra bits.");
57   static constexpr uint32_t kArgMask = MaxInt<uint32_t>(kBitsPerArg);
58 
59   static ObjPtr<mirror::String> AppendF(uint32_t format, const uint32_t* args, Thread* self)
60       REQUIRES_SHARED(Locks::mutator_lock_);
61 
62  private:
63   class Builder;
64 };
65 
66 }  // namespace art
67 
68 #endif  // ART_RUNTIME_STRING_BUILDER_APPEND_H_
69