1 /*
2 * Copyright (C) 2022 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_NATIVE_STRING_ARRAY_UTILS_H_
18 #define ART_RUNTIME_NATIVE_STRING_ARRAY_UTILS_H_
19
20 #include "base/locks.h"
21 #include "class_root-inl.h"
22 #include "handle_scope-inl.h"
23 #include "mirror/object_array-alloc-inl.h"
24 #include "mirror/string.h"
25
26 namespace art {
27
28 namespace detail {
29
GetStringCStr(const char * str)30 inline const char* GetStringCStr(const char* str) { return str; }
GetStringCStr(const std::string & str)31 inline const char* GetStringCStr(const std::string& str) { return str.c_str(); }
32
33 } // namespace detail
34
35 template <typename Container>
CreateStringArray(Thread * self,size_t size,const Container & entries)36 ObjPtr<mirror::ObjectArray<mirror::String>> CreateStringArray(
37 Thread* self, size_t size, const Container& entries) REQUIRES_SHARED(Locks::mutator_lock_) {
38 StackHandleScope<1u> hs(self);
39 Handle<mirror::ObjectArray<mirror::String>> array = hs.NewHandle(
40 mirror::ObjectArray<mirror::String>::Alloc(
41 self, GetClassRoot<mirror::ObjectArray<mirror::String>>(), size));
42 if (array == nullptr) {
43 DCHECK(self->IsExceptionPending());
44 return nullptr;
45 }
46 // Note: If the container's iterator returns a `std::string` by value, the `auto&&`
47 // binds as a const reference and extends the lifetime of the temporary object.
48 size_t pos = 0u;
49 for (auto&& entry : entries) {
50 ObjPtr<mirror::String> oentry =
51 mirror::String::AllocFromModifiedUtf8(self, detail::GetStringCStr(entry));
52 if (oentry == nullptr) {
53 DCHECK(self->IsExceptionPending());
54 return nullptr;
55 }
56 // We're initializing a newly allocated array object, so we do not need to record that under
57 // a transaction. If the transaction is aborted, the whole object shall be unreachable.
58 DCHECK_LT(pos, size);
59 array->SetWithoutChecks</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
60 pos, oentry);
61 ++pos;
62 }
63 DCHECK_EQ(pos, size);
64 return array.Get();
65 }
66
67 template <typename Container>
CreateStringArray(Thread * self,const Container & entries)68 ObjPtr<mirror::ObjectArray<mirror::String>> CreateStringArray(
69 Thread* self, const Container& entries) REQUIRES_SHARED(Locks::mutator_lock_) {
70 return CreateStringArray(self, entries.size(), entries);
71 }
72
CreateStringArray(Thread * self,std::initializer_list<const char * > entries)73 inline ObjPtr<mirror::ObjectArray<mirror::String>> CreateStringArray(
74 Thread* self, std::initializer_list<const char*> entries)
75 REQUIRES_SHARED(Locks::mutator_lock_) {
76 return CreateStringArray<std::initializer_list<const char*>>(self, entries);
77 }
78
79 } // namespace art
80
81 #endif // ART_RUNTIME_NATIVE_STRING_ARRAY_UTILS_H_
82