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gerrit-public.fairphone.software / platform / libnativehelper / 95b0038a7fa3c8db83b024dcf7a915b488e44f28 / . / include / nativehelper / JniConstants.h
blob: f11ec9c1cab2f90fdf3862f64a3f40083e619fdc [file] [log] [blame]
Brian Carlstromdd8af232012-05-13 23:56:07 -0700[diff] [blame]1/*
2 * Copyright (C) 2010 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#ifndef JNI_CONSTANTS_H_included
18#define JNI_CONSTANTS_H_included
19
20#include "JNIHelp.h"
21
22/**
23 * A cache to avoid calling FindClass at runtime.
24 *
25 * Class lookup is relatively expensive (2.5us on passion-eng at the time of writing), so we do
26 * all such lookups eagerly at startup. This means that code that never uses, say,
27 * java.util.zip.Deflater still has to pay for the lookup, but it means that on a device the cost
28 * is definitely paid during boot and amortized. A central cache also removes the temptation to
29 * dynamically call FindClass rather than add a small cache to each file that needs one. Another
30 * cost is that each class cached here requires a global reference, though in practice we save
31 * enough by not having a global reference for each file that uses a class such as java.lang.String
32 * which is used in several files.
33 *
34 * FindClass is still called in a couple of situations: when throwing exceptions, and in some of
35 * the serialization code. The former is clearly not a performance case, and we're currently
36 * assuming that neither is the latter.
37 *
38 * TODO: similar arguments hold for field and method IDs; we should cache them centrally too.
39 */
40struct JniConstants {
41 static void init(JNIEnv* env);
42
43 static jclass bidiRunClass;
44 static jclass bigDecimalClass;
45 static jclass booleanClass;
46 static jclass byteArrayClass;
47 static jclass byteClass;
Kenny Rootf4a3c1e2013-03-07 11:20:28 -0800[diff] [blame]48 static jclass calendarClass;
Brian Carlstromdd8af232012-05-13 23:56:07 -0700[diff] [blame]49 static jclass characterClass;
50 static jclass charsetICUClass;
51 static jclass constructorClass;
52 static jclass deflaterClass;
53 static jclass doubleClass;
54 static jclass errnoExceptionClass;
55 static jclass fieldClass;
56 static jclass fieldPositionIteratorClass;
57 static jclass fileDescriptorClass;
58 static jclass floatClass;
59 static jclass gaiExceptionClass;
60 static jclass inet6AddressClass;
61 static jclass inetAddressClass;
62 static jclass inetSocketAddressClass;
Elliott Hughes95b00382013-03-21 12:08:11 -0700[diff] [blame^]63 static jclass inetUnixAddressClass;
Brian Carlstromdd8af232012-05-13 23:56:07 -0700[diff] [blame]64 static jclass inflaterClass;
Elliott Hughes48f14512013-03-06 09:43:43 -0800[diff] [blame]65 static jclass inputStreamClass;
Brian Carlstromdd8af232012-05-13 23:56:07 -0700[diff] [blame]66 static jclass integerClass;
67 static jclass localeDataClass;
68 static jclass longClass;
69 static jclass methodClass;
70 static jclass mutableIntClass;
71 static jclass mutableLongClass;
Kenny Rootf4a3c1e2013-03-07 11:20:28 -0800[diff] [blame]72 static jclass objectClass;
73 static jclass objectArrayClass;
Elliott Hughes48f14512013-03-06 09:43:43 -0800[diff] [blame]74 static jclass outputStreamClass;
Brian Carlstromdd8af232012-05-13 23:56:07 -0700[diff] [blame]75 static jclass parsePositionClass;
76 static jclass patternSyntaxExceptionClass;
77 static jclass realToStringClass;
78 static jclass shortClass;
79 static jclass socketClass;
80 static jclass socketImplClass;
Brian Carlstromdd8af232012-05-13 23:56:07 -0700[diff] [blame]81 static jclass stringClass;
82 static jclass structAddrinfoClass;
83 static jclass structFlockClass;
84 static jclass structGroupReqClass;
85 static jclass structLingerClass;
86 static jclass structPasswdClass;
87 static jclass structPollfdClass;
88 static jclass structStatClass;
89 static jclass structStatFsClass;
90 static jclass structTimevalClass;
Elliott Hughes95b00382013-03-21 12:08:11 -0700[diff] [blame^]91 static jclass structUcredClass;
Brian Carlstromdd8af232012-05-13 23:56:07 -0700[diff] [blame]92 static jclass structUtsnameClass;
93};
94
95#define NATIVE_METHOD(className, functionName, signature) \
96 { #functionName, signature, reinterpret_cast<void*>(className ## _ ## functionName) }
97
98#endif // JNI_CONSTANTS_H_included