1 /*
2 * Copyright (C) 2008 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 #include "java_lang_String.h"
18
19 #include "nativehelper/jni_macros.h"
20
21 #include "common_throws.h"
22 #include "handle_scope-inl.h"
23 #include "jni/jni_internal.h"
24 #include "mirror/array.h"
25 #include "mirror/object-inl.h"
26 #include "mirror/string-alloc-inl.h"
27 #include "mirror/string-inl.h"
28 #include "native_util.h"
29 #include "nativehelper/scoped_local_ref.h"
30 #include "scoped_fast_native_object_access-inl.h"
31 #include "scoped_thread_state_change-inl.h"
32 #include "verify_object.h"
33
34 namespace art {
35
String_charAt(JNIEnv * env,jobject java_this,jint index)36 static jchar String_charAt(JNIEnv* env, jobject java_this, jint index) {
37 ScopedFastNativeObjectAccess soa(env);
38 return soa.Decode<mirror::String>(java_this)->CharAt(index);
39 }
40
String_compareTo(JNIEnv * env,jobject java_this,jstring java_rhs)41 static jint String_compareTo(JNIEnv* env, jobject java_this, jstring java_rhs) {
42 ScopedFastNativeObjectAccess soa(env);
43 if (UNLIKELY(java_rhs == nullptr)) {
44 ThrowNullPointerException("rhs == null");
45 return -1;
46 } else {
47 return soa.Decode<mirror::String>(java_this)->CompareTo(soa.Decode<mirror::String>(java_rhs));
48 }
49 }
50
String_concat(JNIEnv * env,jobject java_this,jstring java_string_arg)51 static jstring String_concat(JNIEnv* env, jobject java_this, jstring java_string_arg) {
52 ScopedFastNativeObjectAccess soa(env);
53 if (UNLIKELY(java_string_arg == nullptr)) {
54 ThrowNullPointerException("string arg == null");
55 return nullptr;
56 }
57 StackHandleScope<2> hs(soa.Self());
58 Handle<mirror::String> string_this(hs.NewHandle(soa.Decode<mirror::String>(java_this)));
59 Handle<mirror::String> string_arg(hs.NewHandle(soa.Decode<mirror::String>(java_string_arg)));
60 int32_t length_this = string_this->GetLength();
61 int32_t length_arg = string_arg->GetLength();
62 if (length_arg > 0 && length_this > 0) {
63 ObjPtr<mirror::String> result =
64 mirror::String::AllocFromStrings(soa.Self(), string_this, string_arg);
65 return soa.AddLocalReference<jstring>(result);
66 }
67 jobject string_original = (length_this == 0) ? java_string_arg : java_this;
68 return reinterpret_cast<jstring>(string_original);
69 }
70
String_fastSubstring(JNIEnv * env,jobject java_this,jint start,jint length)71 static jstring String_fastSubstring(JNIEnv* env, jobject java_this, jint start, jint length) {
72 ScopedFastNativeObjectAccess soa(env);
73 StackHandleScope<1> hs(soa.Self());
74 Handle<mirror::String> string_this(hs.NewHandle(soa.Decode<mirror::String>(java_this)));
75 gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
76 ObjPtr<mirror::String> result = mirror::String::AllocFromString(soa.Self(),
77 length,
78 string_this,
79 start,
80 allocator_type);
81 return soa.AddLocalReference<jstring>(result);
82 }
83
String_getCharsNoCheck(JNIEnv * env,jobject java_this,jint start,jint end,jcharArray buffer,jint index)84 static void String_getCharsNoCheck(JNIEnv* env, jobject java_this, jint start, jint end,
85 jcharArray buffer, jint index) {
86 ScopedFastNativeObjectAccess soa(env);
87 StackHandleScope<1> hs(soa.Self());
88 Handle<mirror::CharArray> char_array(hs.NewHandle(soa.Decode<mirror::CharArray>(buffer)));
89 soa.Decode<mirror::String>(java_this)->GetChars(start, end, char_array, index);
90 }
91
String_intern(JNIEnv * env,jobject java_this)92 static jstring String_intern(JNIEnv* env, jobject java_this) {
93 ScopedFastNativeObjectAccess soa(env);
94 ObjPtr<mirror::String> result = soa.Decode<mirror::String>(java_this)->Intern();
95 return soa.AddLocalReference<jstring>(result);
96 }
97
String_doReplace(JNIEnv * env,jobject java_this,jchar old_c,jchar new_c)98 static jstring String_doReplace(JNIEnv* env, jobject java_this, jchar old_c, jchar new_c) {
99 ScopedFastNativeObjectAccess soa(env);
100 StackHandleScope<1> hs(soa.Self());
101 Handle<mirror::String> string = hs.NewHandle(soa.Decode<mirror::String>(java_this));
102 ObjPtr<mirror::String> result = mirror::String::DoReplace(soa.Self(), string, old_c, new_c);
103 return soa.AddLocalReference<jstring>(result);
104 }
105
String_toCharArray(JNIEnv * env,jobject java_this)106 static jcharArray String_toCharArray(JNIEnv* env, jobject java_this) {
107 ScopedFastNativeObjectAccess soa(env);
108 StackHandleScope<1u> hs(soa.Self());
109 Handle<mirror::String> s = hs.NewHandle(soa.Decode<mirror::String>(java_this));
110 return soa.AddLocalReference<jcharArray>(mirror::String::ToCharArray(s, soa.Self()));
111 }
112
113 static JNINativeMethod gMethods[] = {
114 FAST_NATIVE_METHOD(String, charAt, "(I)C"),
115 FAST_NATIVE_METHOD(String, compareTo, "(Ljava/lang/String;)I"),
116 FAST_NATIVE_METHOD(String, concat, "(Ljava/lang/String;)Ljava/lang/String;"),
117 FAST_NATIVE_METHOD(String, doReplace, "(CC)Ljava/lang/String;"),
118 FAST_NATIVE_METHOD(String, fastSubstring, "(II)Ljava/lang/String;"),
119 FAST_NATIVE_METHOD(String, getCharsNoCheck, "(II[CI)V"),
120 FAST_NATIVE_METHOD(String, intern, "()Ljava/lang/String;"),
121 FAST_NATIVE_METHOD(String, toCharArray, "()[C"),
122 };
123
register_java_lang_String(JNIEnv * env)124 void register_java_lang_String(JNIEnv* env) {
125 REGISTER_NATIVE_METHODS("java/lang/String");
126 }
127
128 } // namespace art
129