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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* JNI innards, common to the regular and "checked" interfaces.
*/
#ifndef DALVIK_JNIINTERNAL_H_
#define DALVIK_JNIINTERNAL_H_
#include "jni.h"
/* system init/shutdown */
bool dvmJniStartup(void);
void dvmJniShutdown(void);
/*
* Our data structures for JNIEnv and JavaVM.
*
* Native code thinks it has a pointer to a pointer. We know better.
*/
struct JavaVMExt;
struct JNIEnvExt {
const struct JNINativeInterface* funcTable; /* must be first */
const struct JNINativeInterface* baseFuncTable;
u4 envThreadId;
Thread* self;
/* if nonzero, we are in a "critical" JNI call */
int critical;
struct JNIEnvExt* prev;
struct JNIEnvExt* next;
};
struct JavaVMExt {
const struct JNIInvokeInterface* funcTable; /* must be first */
const struct JNIInvokeInterface* baseFuncTable;
/* head of list of JNIEnvs associated with this VM */
JNIEnvExt* envList;
pthread_mutex_t envListLock;
};
/*
* Native function return type; used by dvmPlatformInvoke().
*
* This is part of Method.jniArgInfo, and must fit in 3 bits.
* Note: Assembly code in arch/<arch>/Call<arch>.S relies on
* the enum values defined here.
*/
enum DalvikJniReturnType {
DALVIK_JNI_RETURN_VOID = 0, /* must be zero */
DALVIK_JNI_RETURN_FLOAT = 1,
DALVIK_JNI_RETURN_DOUBLE = 2,
DALVIK_JNI_RETURN_S8 = 3,
DALVIK_JNI_RETURN_S4 = 4,
DALVIK_JNI_RETURN_S2 = 5,
DALVIK_JNI_RETURN_U2 = 6,
DALVIK_JNI_RETURN_S1 = 7
};
#define DALVIK_JNI_NO_ARG_INFO 0x80000000
#define DALVIK_JNI_RETURN_MASK 0x70000000
#define DALVIK_JNI_RETURN_SHIFT 28
#define DALVIK_JNI_COUNT_MASK 0x0f000000
#define DALVIK_JNI_COUNT_SHIFT 24
/*
* Pop the JNI local stack when we return from a native method. "saveArea"
* points to the StackSaveArea for the method we're leaving.
*
* (This may be implemented directly in assembly in mterp, so changes here
* may only affect the portable interpreter.)
*/
INLINE void dvmPopJniLocals(Thread* self, StackSaveArea* saveArea)
{
self->jniLocalRefTable.segmentState.all = saveArea->xtra.localRefCookie;
}
/*
* Set the envThreadId field.
*/
INLINE void dvmSetJniEnvThreadId(JNIEnv* pEnv, Thread* self)
{
((JNIEnvExt*)pEnv)->envThreadId = self->threadId;
((JNIEnvExt*)pEnv)->self = self;
}
void dvmCallJNIMethod(const u4* args, JValue* pResult,
const Method* method, Thread* self);
void dvmCheckCallJNIMethod(const u4* args, JValue* pResult,
const Method* method, Thread* self);
/*
* Configure "method" to use the JNI bridge to call "func".
*/
void dvmUseJNIBridge(Method* method, void* func);
/*
* Enable the "checked" versions.
*/
void dvmUseCheckedJniEnv(JNIEnvExt* pEnv);
void dvmUseCheckedJniVm(JavaVMExt* pVm);
void dvmLateEnableCheckedJni(void);
/*
* Decode a local, global, or weak-global reference.
*/
Object* dvmDecodeIndirectRef(Thread* self, jobject jobj);
/*
* Verify that a reference passed in from native code is valid. Returns
* an indication of local/global/invalid.
*/
jobjectRefType dvmGetJNIRefType(Thread* self, jobject jobj);
/*
* Get the last method called on the interp stack. This is the method
* "responsible" for calling into JNI.
*/
const Method* dvmGetCurrentJNIMethod(void);
/*
* Create/destroy a JNIEnv for the current thread.
*/
JNIEnv* dvmCreateJNIEnv(Thread* self);
void dvmDestroyJNIEnv(JNIEnv* env);
/*
* Find the JNIEnv associated with the current thread.
*/
JNIEnvExt* dvmGetJNIEnvForThread(void);
/*
* Release all MonitorEnter-acquired locks that are still held. Called at
* DetachCurrentThread time.
*/
void dvmReleaseJniMonitors(Thread* self);
/*
* Dump the contents of the JNI reference tables to the log file.
*
* The local ref tables associated with other threads are not included.
*/
void dvmDumpJniReferenceTables(void);
#endif // DALVIK_JNIINTERNAL_H_
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