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