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 * This is part of Method.jniArgInfo, and must fit in 3 bits.
77 * Note: Assembly code in arch/<arch>/Call<arch>.S relies on
78 * the enum values defined here.
80 typedef enum DalvikJniReturnType {
81 DALVIK_JNI_RETURN_VOID = 0, /* must be zero */
82 DALVIK_JNI_RETURN_FLOAT = 1,
83 DALVIK_JNI_RETURN_DOUBLE = 2,
84 DALVIK_JNI_RETURN_S8 = 3,
85 DALVIK_JNI_RETURN_S4 = 4,
86 DALVIK_JNI_RETURN_S2 = 5,
87 DALVIK_JNI_RETURN_U2 = 6,
88 DALVIK_JNI_RETURN_S1 = 7
89 } DalvikJniReturnType;
91 #define DALVIK_JNI_NO_ARG_INFO 0x80000000
92 #define DALVIK_JNI_RETURN_MASK 0x70000000
93 #define DALVIK_JNI_RETURN_SHIFT 28
94 #define DALVIK_JNI_COUNT_MASK 0x0f000000
95 #define DALVIK_JNI_COUNT_SHIFT 24
99 * Pop the JNI local stack when we return from a native method. "saveArea"
100 * points to the StackSaveArea for the method we're leaving.
102 INLINE void dvmPopJniLocals(Thread* self, StackSaveArea* saveArea)
104 if (saveArea->xtra.localRefTop != self->jniLocalRefTable.nextEntry) {
105 LOGVV("LREF: popped %d entries (%d remain)\n",
106 (int)(self->jniLocalRefTable.nextEntry-saveArea->xtra.localRefTop),
107 (int)(saveArea->xtra.localRefTop - self->jniLocalRefTable.table));
109 self->jniLocalRefTable.nextEntry = saveArea->xtra.localRefTop;
113 * Set the envThreadId field.
115 INLINE void dvmSetJniEnvThreadId(JNIEnv* pEnv, Thread* self)
117 ((JNIEnvExt*)pEnv)->envThreadId = self->threadId;
118 ((JNIEnvExt*)pEnv)->self = self;
122 * JNI call bridges. Not usually called directly.
124 * The "Check" versions are used when CheckJNI is enabled.
126 void dvmCallJNIMethod(const u4* args, JValue* pResult, const Method* method,
128 void dvmCallSynchronizedJNIMethod(const u4* args, JValue* pResult,
129 const Method* method, Thread* self);
130 void dvmCheckCallJNIMethod(const u4* args, JValue* pResult,
131 const Method* method, Thread* self);
132 void dvmCheckCallSynchronizedJNIMethod(const u4* args, JValue* pResult,
133 const Method* method, Thread* self);
136 * Configure "method" to use the JNI bridge to call "func".
138 void dvmUseJNIBridge(Method* method, void* func);
142 * Enable the "checked" versions.
144 void dvmUseCheckedJniEnv(JNIEnvExt* pEnv);
145 void dvmUseCheckedJniVm(JavaVMExt* pVm);
146 void dvmLateEnableCheckedJni(void);
149 * Verify that a reference passed in from native code is valid. Returns
150 * an indication of local/global/invalid.
152 jobjectRefType dvmGetJNIRefType(Object* obj);
155 * Get the last method called on the interp stack. This is the method
156 * "responsible" for calling into JNI.
158 const Method* dvmGetCurrentJNIMethod(void);
161 * Create/destroy a JNIEnv for the current thread.
163 JNIEnv* dvmCreateJNIEnv(Thread* self);
164 void dvmDestroyJNIEnv(JNIEnv* env);
167 * Find the JNIEnv associated with the current thread.
169 JNIEnvExt* dvmGetJNIEnvForThread(void);
172 * Extract the return type enum from the "jniArgInfo" value.
174 DalvikJniReturnType dvmGetArgInfoReturnType(int jniArgInfo);
177 * Release all MonitorEnter-acquired locks that are still held. Called at
178 * DetachCurrentThread time.
180 void dvmReleaseJniMonitors(Thread* self);
182 #endif /*_DALVIK_JNIINTERNAL*/