2 * Copyright (C) 2008 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 * JNI innards, common to the regular and "checked" interfaces.
19 #ifndef DALVIK_JNIINTERNAL_H_
20 #define DALVIK_JNIINTERNAL_H_
24 /* system init/shutdown */
25 bool dvmJniStartup(void);
26 void dvmJniShutdown(void);
28 bool dvmIsBadJniVersion(int version);
31 * Our data structures for JNIEnv and JavaVM.
33 * Native code thinks it has a pointer to a pointer. We know better.
38 const struct JNINativeInterface* funcTable; /* must be first */
40 const struct JNINativeInterface* baseFuncTable;
45 /* if nonzero, we are in a "critical" JNI call */
48 struct JNIEnvExt* prev;
49 struct JNIEnvExt* next;
53 const struct JNIInvokeInterface* funcTable; /* must be first */
55 const struct JNIInvokeInterface* baseFuncTable;
57 /* head of list of JNIEnvs associated with this VM */
59 pthread_mutex_t envListLock;
63 * Native function return type; used by dvmPlatformInvoke().
65 * This is part of Method.jniArgInfo, and must fit in 3 bits.
66 * Note: Assembly code in arch/<arch>/Call<arch>.S relies on
67 * the enum values defined here.
69 enum DalvikJniReturnType {
70 DALVIK_JNI_RETURN_VOID = 0, /* must be zero */
71 DALVIK_JNI_RETURN_FLOAT = 1,
72 DALVIK_JNI_RETURN_DOUBLE = 2,
73 DALVIK_JNI_RETURN_S8 = 3,
74 DALVIK_JNI_RETURN_S4 = 4,
75 DALVIK_JNI_RETURN_S2 = 5,
76 DALVIK_JNI_RETURN_U2 = 6,
77 DALVIK_JNI_RETURN_S1 = 7
80 #define DALVIK_JNI_NO_ARG_INFO 0x80000000
81 #define DALVIK_JNI_RETURN_MASK 0x70000000
82 #define DALVIK_JNI_RETURN_SHIFT 28
83 #define DALVIK_JNI_COUNT_MASK 0x0f000000
84 #define DALVIK_JNI_COUNT_SHIFT 24
88 * Pop the JNI local stack when we return from a native method. "saveArea"
89 * points to the StackSaveArea for the method we're leaving.
91 * (This may be implemented directly in assembly in mterp, so changes here
92 * may only affect the portable interpreter.)
94 INLINE void dvmPopJniLocals(Thread* self, StackSaveArea* saveArea)
96 self->jniLocalRefTable.segmentState.all = saveArea->xtra.localRefCookie;
100 * Set the envThreadId field.
102 INLINE void dvmSetJniEnvThreadId(JNIEnv* pEnv, Thread* self)
104 ((JNIEnvExt*)pEnv)->envThreadId = self->threadId;
105 ((JNIEnvExt*)pEnv)->self = self;
108 void dvmCallJNIMethod(const u4* args, JValue* pResult,
109 const Method* method, Thread* self);
110 void dvmCheckCallJNIMethod(const u4* args, JValue* pResult,
111 const Method* method, Thread* self);
114 * Configure "method" to use the JNI bridge to call "func".
116 void dvmUseJNIBridge(Method* method, void* func);
120 * Enable the "checked" versions.
122 void dvmUseCheckedJniEnv(JNIEnvExt* pEnv);
123 void dvmUseCheckedJniVm(JavaVMExt* pVm);
124 void dvmLateEnableCheckedJni(void);
127 * Decode a local, global, or weak-global reference.
129 Object* dvmDecodeIndirectRef(Thread* self, jobject jobj);
132 * Verify that a reference passed in from native code is valid. Returns
133 * an indication of local/global/invalid.
135 jobjectRefType dvmGetJNIRefType(Thread* self, jobject jobj);
138 * Get the last method called on the interp stack. This is the method
139 * "responsible" for calling into JNI.
141 const Method* dvmGetCurrentJNIMethod(void);
144 * Create/destroy a JNIEnv for the current thread.
146 JNIEnv* dvmCreateJNIEnv(Thread* self);
147 void dvmDestroyJNIEnv(JNIEnv* env);
150 * Find the JNIEnv associated with the current thread.
152 JNIEnvExt* dvmGetJNIEnvForThread(void);
155 * Release all MonitorEnter-acquired locks that are still held. Called at
156 * DetachCurrentThread time.
158 void dvmReleaseJniMonitors(Thread* self);
161 * Dump the contents of the JNI reference tables to the log file.
163 * The local ref tables associated with other threads are not included.
165 void dvmDumpJniReferenceTables(void);
167 // Dumps JNI statistics in response to SIGQUIT.
168 struct DebugOutputTarget;
169 void dvmDumpJniStats(DebugOutputTarget* target);
171 #endif // DALVIK_JNIINTERNAL_H_