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126 lines
4.5 KiB
126 lines
4.5 KiB
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <sys/cdefs.h>
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#include <stdbool.h>
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__BEGIN_DECLS
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/*
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* The JNI invocation API exists to allow a choice of library responsible for managing virtual
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* machines.
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*/
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/*
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* Opaque structure used to hold JNI invocation internal state.
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*/
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struct JniInvocationImpl;
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/*
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* Creates an instance of a JniInvocationImpl.
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*/
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struct JniInvocationImpl* JniInvocationCreate();
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/*
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* Associates a library with a JniInvocationImpl instance. The library should export C symbols for
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* JNI_GetDefaultJavaVMInitArgs, JNI_CreateJavaVM and JNI_GetDefaultJavaVMInitArgs.
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*
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* The specified |library| should be the filename of a shared library. The |library| is opened with
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* dlopen(3).
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*
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* If there is an error opening the specified |library|, then function will fallback to the
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* default library "libart.so". If the fallback library is successfully used then a warning is
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* written to the Android log buffer. Use of the fallback library is not considered an error.
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*
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* If the fallback library cannot be opened or the expected symbols are not found in the library
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* opened, then an error message is written to the Android log buffer and the function returns 0.
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*
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* Returns true on success, false otherwise.
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*/
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bool JniInvocationInit(struct JniInvocationImpl* instance, const char* library);
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/*
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* Release resources associated with JniInvocationImpl instance.
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*/
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void JniInvocationDestroy(struct JniInvocationImpl* instance);
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/*
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* Gets the default library for JNI invocation. The default library is "libart.so". This value may
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* be overridden for debuggable builds using the persist.sys.dalvik.vm.lib.2 system property.
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*
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* The |library| argument is the preferred library to use on debuggable builds (when
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* ro.debuggable=1). If the |library| argument is nullptr, then the system preferred value will be
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* queried from persist.sys.dalvik.vm.lib.2 if the caller has provided |buffer| argument.
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*
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* The |buffer| argument is used for reading system properties in debuggable builds. It is
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* optional, but should be provisioned to be PROP_VALUE_MAX bytes if provided to ensure it is
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* large enough to hold a system property.
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*
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* Returns the filename of the invocation library determined from the inputs and system
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* properties. The returned value may be |library|, |buffer|, or a pointer to a string constant
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* "libart.so".
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*/
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const char* JniInvocationGetLibrary(const char* library, char* buffer);
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__END_DECLS
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#ifdef __cplusplus
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// JniInvocation adds a layer of indirection for applications using
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// the JNI invocation API to allow the JNI implementation to be
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// selected dynamically. Apps can specify a specific implementation to
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// be used by calling InitJniInvocation. If this is not done, the
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// library will chosen based on the value of Android system property
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// persist.sys.dalvik.vm.lib on the device, and otherwise fall back to
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// a hard-coded default implementation.
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class JniInvocation final {
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public:
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JniInvocation() {
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impl_ = JniInvocationCreate();
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}
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~JniInvocation() {
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JniInvocationDestroy(impl_);
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}
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// Initialize JNI invocation API. library should specify a valid
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// shared library for opening via dlopen providing a JNI invocation
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// implementation, or null to allow defaulting via
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// persist.sys.dalvik.vm.lib.
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bool Init(const char* library) {
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return JniInvocationInit(impl_, library) != 0;
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}
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// Exposes which library is actually loaded from the given name. The
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// buffer of size PROPERTY_VALUE_MAX will be used to load the system
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// property for the default library, if necessary. If no buffer is
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// provided, the fallback value will be used.
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static const char* GetLibrary(const char* library, char* buffer) {
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return JniInvocationGetLibrary(library, buffer);
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}
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private:
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JniInvocation(const JniInvocation&) = delete;
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JniInvocation& operator=(const JniInvocation&) = delete;
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JniInvocationImpl* impl_;
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};
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#endif // __cplusplus
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