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 "jni_internal.h" 23 #include "mirror/array.h" 24 #include "mirror/object-inl.h" 25 #include "mirror/string-inl.h" 26 #include "mirror/string.h" 27 #include "native_util.h" 28 #include "nativehelper/ScopedLocalRef.h" 29 #include "scoped_fast_native_object_access-inl.h" 30 #include "scoped_thread_state_change-inl.h" 31 #include "verify_object.h" 32 33 namespace art { 34 35 static jchar String_charAt(JNIEnv* env, jobject java_this, jint index) { 36 ScopedFastNativeObjectAccess soa(env); 37 return soa.Decode<mirror::String>(java_this)->CharAt(index); 38 } 39 40 static jint String_compareTo(JNIEnv* env, jobject java_this, jobject java_rhs) { 41 ScopedFastNativeObjectAccess soa(env); 42 if (UNLIKELY(java_rhs == nullptr)) { 43 ThrowNullPointerException("rhs == null"); 44 return -1; 45 } else { 46 return soa.Decode<mirror::String>(java_this)->CompareTo( 47 soa.Decode<mirror::String>(java_rhs).Ptr()); 48 } 49 } 50 51 static jstring String_concat(JNIEnv* env, jobject java_this, jobject 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 71 static jint String_fastIndexOf(JNIEnv* env, jobject java_this, jint ch, jint start) { 72 ScopedFastNativeObjectAccess soa(env); 73 // This method does not handle supplementary characters. They're dealt with in managed code. 74 DCHECK_LE(ch, 0xffff); 75 return soa.Decode<mirror::String>(java_this)->FastIndexOf(ch, start); 76 } 77 78 static jstring String_fastSubstring(JNIEnv* env, jobject java_this, jint start, jint length) { 79 ScopedFastNativeObjectAccess soa(env); 80 StackHandleScope<1> hs(soa.Self()); 81 Handle<mirror::String> string_this(hs.NewHandle(soa.Decode<mirror::String>(java_this))); 82 gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator(); 83 ObjPtr<mirror::String> result = mirror::String::AllocFromString<true>(soa.Self(), 84 length, 85 string_this, 86 start, 87 allocator_type); 88 return soa.AddLocalReference<jstring>(result); 89 } 90 91 static void String_getCharsNoCheck(JNIEnv* env, jobject java_this, jint start, jint end, 92 jcharArray buffer, jint index) { 93 ScopedFastNativeObjectAccess soa(env); 94 StackHandleScope<1> hs(soa.Self()); 95 Handle<mirror::CharArray> char_array(hs.NewHandle(soa.Decode<mirror::CharArray>(buffer))); 96 soa.Decode<mirror::String>(java_this)->GetChars(start, end, char_array, index); 97 } 98 99 static jstring String_intern(JNIEnv* env, jobject java_this) { 100 ScopedFastNativeObjectAccess soa(env); 101 ObjPtr<mirror::String> result = soa.Decode<mirror::String>(java_this)->Intern(); 102 return soa.AddLocalReference<jstring>(result); 103 } 104 105 static jstring String_doReplace(JNIEnv* env, jobject java_this, jchar old_c, jchar new_c) { 106 ScopedFastNativeObjectAccess soa(env); 107 StackHandleScope<1> hs(soa.Self()); 108 Handle<mirror::String> string = hs.NewHandle(soa.Decode<mirror::String>(java_this)); 109 ObjPtr<mirror::String> result = mirror::String::DoReplace(soa.Self(), string, old_c, new_c); 110 return soa.AddLocalReference<jstring>(result); 111 } 112 113 static jcharArray String_toCharArray(JNIEnv* env, jobject java_this) { 114 ScopedFastNativeObjectAccess soa(env); 115 ObjPtr<mirror::String> s = soa.Decode<mirror::String>(java_this); 116 return soa.AddLocalReference<jcharArray>(s->ToCharArray(soa.Self())); 117 } 118 119 static JNINativeMethod gMethods[] = { 120 FAST_NATIVE_METHOD(String, charAt, "(I)C"), 121 FAST_NATIVE_METHOD(String, compareTo, "(Ljava/lang/String;)I"), 122 FAST_NATIVE_METHOD(String, concat, "(Ljava/lang/String;)Ljava/lang/String;"), 123 FAST_NATIVE_METHOD(String, doReplace, "(CC)Ljava/lang/String;"), 124 FAST_NATIVE_METHOD(String, fastIndexOf, "(II)I"), 125 FAST_NATIVE_METHOD(String, fastSubstring, "(II)Ljava/lang/String;"), 126 FAST_NATIVE_METHOD(String, getCharsNoCheck, "(II[CI)V"), 127 FAST_NATIVE_METHOD(String, intern, "()Ljava/lang/String;"), 128 FAST_NATIVE_METHOD(String, toCharArray, "()[C"), 129 }; 130 131 void register_java_lang_String(JNIEnv* env) { 132 REGISTER_NATIVE_METHODS("java/lang/String"); 133 } 134 135 } // namespace art 136
