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
20 #define _DALVIK_JNIINTERNAL
24 /* system init/shutdown */
25 bool dvmJniStartup(void);
26 void dvmJniShutdown(void);
29 * Our data structures for JNIEnv and JavaVM.
31 * Native code thinks it has a pointer to a pointer. We know better.
35 typedef struct JNIEnvExt {
36 const struct JNINativeInterface* funcTable; /* must be first */
38 const struct JNINativeInterface* baseFuncTable;
40 /* pointer to the VM we are a part of */
46 /* if nonzero, we are in a "critical" JNI call */
49 /* keep a copy of this here for speed */
52 struct JNIEnvExt* prev;
53 struct JNIEnvExt* next;
56 typedef struct JavaVMExt {
57 const struct JNIInvokeInterface* funcTable; /* must be first */
59 const struct JNIInvokeInterface* baseFuncTable;
61 /* if multiple VMs are desired, add doubly-linked list stuff here */
63 /* per-VM feature flags */
68 /* head of list of JNIEnvs associated with this VM */
70 pthread_mutex_t envListLock;
74 * Native function return type; used by dvmPlatformInvoke().
76 typedef enum DalvikJniReturnType {
77 DALVIK_JNI_RETURN_VOID = 0, /* must be zero */
78 DALVIK_JNI_RETURN_FLOAT,
79 DALVIK_JNI_RETURN_DOUBLE,
82 } DalvikJniReturnType;
84 #define DALVIK_JNI_NO_ARG_INFO 0x80000000
85 #define DALVIK_JNI_RETURN_MASK 0x70000000
86 #define DALVIK_JNI_RETURN_SHIFT 28
87 #define DALVIK_JNI_COUNT_MASK 0x0f000000
88 #define DALVIK_JNI_COUNT_SHIFT 24
92 * Pop the JNI local stack when we return from a native method. "saveArea"
93 * points to the StackSaveArea for the method we're leaving.
95 INLINE void dvmPopJniLocals(Thread* self, StackSaveArea* saveArea)
97 if (saveArea->xtra.localRefTop != self->jniLocalRefTable.nextEntry) {
98 LOGVV("LREF: popped %d entries (%d remain)\n",
99 (int)(self->jniLocalRefTable.nextEntry-saveArea->xtra.localRefTop),
100 (int)(saveArea->xtra.localRefTop - self->jniLocalRefTable.table));
102 self->jniLocalRefTable.nextEntry = saveArea->xtra.localRefTop;
106 * Set the envThreadId field.
108 INLINE void dvmSetJniEnvThreadId(JNIEnv* pEnv, Thread* self)
110 ((JNIEnvExt*)pEnv)->envThreadId = self->threadId;
111 ((JNIEnvExt*)pEnv)->self = self;
115 * JNI call bridges. Not usually called directly.
117 void dvmCallJNIMethod(const u4* args, JValue* pResult, const Method* method,
119 void dvmCallSynchronizedJNIMethod(const u4* args, JValue* pResult,
120 const Method* method, Thread* self);
123 * Enable the "checked" versions.
125 void dvmUseCheckedJniEnv(JNIEnvExt* pEnv);
126 void dvmUseCheckedJniVm(JavaVMExt* pVm);
127 void dvmLateEnableCheckedJni(void);
130 * Verify that a reference passed in from native code is valid. Returns
131 * an indication of local/global/invalid.
133 jobjectRefType dvmGetJNIRefType(Object* obj);
136 * Get the last method called on the interp stack. This is the method
137 * "responsible" for calling into JNI.
139 const Method* dvmGetCurrentJNIMethod(void);
142 * Create/destroy a JNIEnv for the current thread.
144 JNIEnv* dvmCreateJNIEnv(Thread* self);
145 void dvmDestroyJNIEnv(JNIEnv* env);
148 * Find the JNIEnv associated with the current thread.
150 JNIEnvExt* dvmGetJNIEnvForThread(void);
153 * Extract the return type enum from the "jniArgInfo" value.
155 DalvikJniReturnType dvmGetArgInfoReturnType(int jniArgInfo);
158 * Release all MonitorEnter-acquired locks that are still held. Called at
159 * DetachCurrentThread time.
161 void dvmReleaseJniMonitors(Thread* self);
163 #endif /*_DALVIK_JNIINTERNAL*/