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 "common_throws.h"
20 #include "jni_internal.h"
21 #include "mirror/array.h"
22 #include "mirror/object-inl.h"
23 #include "mirror/string.h"
24 #include "mirror/string-inl.h"
25 #include "scoped_fast_native_object_access-inl.h"
26 #include "scoped_thread_state_change-inl.h"
27 #include "ScopedLocalRef.h"
28 #include "verify_object.h"
29
30 namespace art {
31
String_charAt(JNIEnv * env,jobject java_this,jint index)32 static jchar String_charAt(JNIEnv* env, jobject java_this, jint index) {
33 ScopedFastNativeObjectAccess soa(env);
34 return soa.Decode<mirror::String>(java_this)->CharAt(index);
35 }
36
String_compareTo(JNIEnv * env,jobject java_this,jobject java_rhs)37 static jint String_compareTo(JNIEnv* env, jobject java_this, jobject java_rhs) {
38 ScopedFastNativeObjectAccess soa(env);
39 if (UNLIKELY(java_rhs == nullptr)) {
40 ThrowNullPointerException("rhs == null");
41 return -1;
42 } else {
43 return soa.Decode<mirror::String>(java_this)->CompareTo(
44 soa.Decode<mirror::String>(java_rhs).Ptr());
45 }
46 }
47
String_concat(JNIEnv * env,jobject java_this,jobject java_string_arg)48 static jstring String_concat(JNIEnv* env, jobject java_this, jobject java_string_arg) {
49 ScopedFastNativeObjectAccess soa(env);
50 if (UNLIKELY(java_string_arg == nullptr)) {
51 ThrowNullPointerException("string arg == null");
52 return nullptr;
53 }
54 StackHandleScope<2> hs(soa.Self());
55 Handle<mirror::String> string_this(hs.NewHandle(soa.Decode<mirror::String>(java_this)));
56 Handle<mirror::String> string_arg(hs.NewHandle(soa.Decode<mirror::String>(java_string_arg)));
57 int32_t length_this = string_this->GetLength();
58 int32_t length_arg = string_arg->GetLength();
59 if (length_arg > 0 && length_this > 0) {
60 ObjPtr<mirror::String> result =
61 mirror::String::AllocFromStrings(soa.Self(), string_this, string_arg);
62 return soa.AddLocalReference<jstring>(result);
63 }
64 jobject string_original = (length_this == 0) ? java_string_arg : java_this;
65 return reinterpret_cast<jstring>(string_original);
66 }
67
String_fastIndexOf(JNIEnv * env,jobject java_this,jint ch,jint start)68 static jint String_fastIndexOf(JNIEnv* env, jobject java_this, jint ch, jint start) {
69 ScopedFastNativeObjectAccess soa(env);
70 // This method does not handle supplementary characters. They're dealt with in managed code.
71 DCHECK_LE(ch, 0xffff);
72 return soa.Decode<mirror::String>(java_this)->FastIndexOf(ch, start);
73 }
74
String_fastSubstring(JNIEnv * env,jobject java_this,jint start,jint length)75 static jstring String_fastSubstring(JNIEnv* env, jobject java_this, jint start, jint length) {
76 ScopedFastNativeObjectAccess soa(env);
77 StackHandleScope<1> hs(soa.Self());
78 Handle<mirror::String> string_this(hs.NewHandle(soa.Decode<mirror::String>(java_this)));
79 gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
80 ObjPtr<mirror::String> result = mirror::String::AllocFromString<true>(soa.Self(),
81 length,
82 string_this,
83 start,
84 allocator_type);
85 return soa.AddLocalReference<jstring>(result);
86 }
87
String_getCharsNoCheck(JNIEnv * env,jobject java_this,jint start,jint end,jcharArray buffer,jint index)88 static void String_getCharsNoCheck(JNIEnv* env, jobject java_this, jint start, jint end,
89 jcharArray buffer, jint index) {
90 ScopedFastNativeObjectAccess soa(env);
91 StackHandleScope<1> hs(soa.Self());
92 Handle<mirror::CharArray> char_array(hs.NewHandle(soa.Decode<mirror::CharArray>(buffer)));
93 soa.Decode<mirror::String>(java_this)->GetChars(start, end, char_array, index);
94 }
95
String_intern(JNIEnv * env,jobject java_this)96 static jstring String_intern(JNIEnv* env, jobject java_this) {
97 ScopedFastNativeObjectAccess soa(env);
98 ObjPtr<mirror::String> result = soa.Decode<mirror::String>(java_this)->Intern();
99 return soa.AddLocalReference<jstring>(result);
100 }
101
String_doReplace(JNIEnv * env,jobject java_this,jchar old_c,jchar new_c)102 static jstring String_doReplace(JNIEnv* env, jobject java_this, jchar old_c, jchar new_c) {
103 ScopedFastNativeObjectAccess soa(env);
104 StackHandleScope<1> hs(soa.Self());
105 Handle<mirror::String> string = hs.NewHandle(soa.Decode<mirror::String>(java_this));
106 ObjPtr<mirror::String> result = mirror::String::DoReplace(soa.Self(), string, old_c, new_c);
107 return soa.AddLocalReference<jstring>(result);
108 }
109
String_toCharArray(JNIEnv * env,jobject java_this)110 static jcharArray String_toCharArray(JNIEnv* env, jobject java_this) {
111 ScopedFastNativeObjectAccess soa(env);
112 ObjPtr<mirror::String> s = soa.Decode<mirror::String>(java_this);
113 return soa.AddLocalReference<jcharArray>(s->ToCharArray(soa.Self()));
114 }
115
116 static JNINativeMethod gMethods[] = {
117 FAST_NATIVE_METHOD(String, charAt, "(I)C"),
118 FAST_NATIVE_METHOD(String, compareTo, "(Ljava/lang/String;)I"),
119 FAST_NATIVE_METHOD(String, concat, "(Ljava/lang/String;)Ljava/lang/String;"),
120 FAST_NATIVE_METHOD(String, doReplace, "(CC)Ljava/lang/String;"),
121 FAST_NATIVE_METHOD(String, fastIndexOf, "(II)I"),
122 FAST_NATIVE_METHOD(String, fastSubstring, "(II)Ljava/lang/String;"),
123 FAST_NATIVE_METHOD(String, getCharsNoCheck, "(II[CI)V"),
124 FAST_NATIVE_METHOD(String, intern, "()Ljava/lang/String;"),
125 FAST_NATIVE_METHOD(String, toCharArray, "()[C"),
126 };
127
register_java_lang_String(JNIEnv * env)128 void register_java_lang_String(JNIEnv* env) {
129 REGISTER_NATIVE_METHODS("java/lang/String");
130 }
131
132 } // namespace art
133