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
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(
44        soa.Decode<mirror::String>(java_rhs).Ptr());
45  }
46}
47
48static 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
68static 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
75static 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
88static 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
96static 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
102static 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
110static 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
116static 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
128void register_java_lang_String(JNIEnv* env) {
129  REGISTER_NATIVE_METHODS("java/lang/String");
130}
131
132}  // namespace art
133