| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "prims/jni.h" |
| |
| // Opaque reference to a JImage file. |
| class JImageFile; |
| // Opaque reference to an image file resource location. |
| typedef jlong JImageLocationRef; |
| |
| // Max path length limit independent of platform. Windows max path is 1024, |
| // other platforms use 4096. The JCK fails several tests when 1024 is used. |
| #define JIMAGE_MAX_PATH 4096 |
| |
| // JImage Error Codes |
| |
| // Resource was not found |
| #define JIMAGE_NOT_FOUND (0) |
| // The image file is not prefixed with 0xCAFEDADA |
| #define JIMAGE_BAD_MAGIC (-1) |
| // The image file does not have a compatible (translatable) version |
| #define JIMAGE_BAD_VERSION (-2) |
| // The image file content is malformed |
| #define JIMAGE_CORRUPTED (-3) |
| |
| /* |
| * JImageOpen - Given the supplied full path file name, open an image file. This |
| * function will also initialize tables and retrieve meta-data necessary to |
| * satisfy other functions in the API. If the image file has been previously |
| * open, a new open request will share memory and resources used by the previous |
| * open. A call to JImageOpen should be balanced by a call to JImageClose, to |
| * release memory and resources used. If the image file is not found or cannot |
| * be open, then NULL is returned and error will contain a reason for the |
| * failure; a positive value for a system error number, negative for a jimage |
| * specific error (see JImage Error Codes.) |
| * |
| * Ex. |
| * jint error; |
| * JImageFile* jimage = (*JImageOpen)(JAVA_HOME "lib/modules", &error); |
| * if (image == NULL) { |
| * tty->print_cr("JImage failed to open: %d", error); |
| * ... |
| * } |
| * ... |
| */ |
| |
| extern "C" JImageFile* JIMAGE_Open(const char *name, jint* error); |
| |
| typedef JImageFile* (*JImageOpen_t)(const char *name, jint* error); |
| |
| /* |
| * JImageClose - Given the supplied open image file (see JImageOpen), release |
| * memory and resources used by the open file and close the file. If the image |
| * file is shared by other uses, release and close is deferred until the last use |
| * is also closed. |
| * |
| * Ex. |
| * (*JImageClose)(image); |
| */ |
| |
| extern "C" void JIMAGE_Close(JImageFile* jimage); |
| |
| typedef void (*JImageClose_t)(JImageFile* jimage); |
| |
| |
| /* |
| * JImagePackageToModule - Given an open image file (see JImageOpen) and the name |
| * of a package, return the name of module where the package resides. If the |
| * package does not exist in the image file, the function returns NULL. |
| * The resulting string does/should not have to be released. All strings are |
| * utf-8, zero byte terminated. |
| * |
| * Ex. |
| * const char* package = (*JImagePackageToModule)(image, "java/lang"); |
| * tty->print_cr(package); |
| * —> java.base |
| */ |
| |
| extern "C" const char * JIMAGE_PackageToModule(JImageFile* jimage, const char* package_name); |
| |
| typedef const char* (*JImagePackageToModule_t)(JImageFile* jimage, const char* package_name); |
| |
| |
| /* |
| * JImageFindResource - Given an open image file (see JImageOpen), a module |
| * name, a version string and the name of a class/resource, return location |
| * information describing the resource and its size. If no resource is found, the |
| * function returns JIMAGE_NOT_FOUND and the value of size is undefined. |
| * The version number should be "9.0" and is not used in locating the resource. |
| * The resulting location does/should not have to be released. |
| * All strings are utf-8, zero byte terminated. |
| * |
| * Ex. |
| * jlong size; |
| * JImageLocationRef location = (*JImageFindResource)(image, "java.base", "9.0", "java/lang/String.class", &size); |
| */ |
| extern "C" JImageLocationRef JIMAGE_FindResource(JImageFile* jimage, |
| const char* module_name, const char* version, const char* name, |
| jlong* size); |
| |
| typedef JImageLocationRef(*JImageFindResource_t)(JImageFile* jimage, |
| const char* module_name, const char* version, const char* name, |
| jlong* size); |
| |
| |
| /* |
| * JImageGetResource - Given an open image file (see JImageOpen), a resource’s |
| * location information (see JImageFindResource), a buffer of appropriate |
| * size and the size, retrieve the bytes associated with the |
| * resource. If the size is less than the resource size then the read is truncated. |
| * If the size is greater than the resource size then the remainder of the buffer |
| * is zero filled. The function will return the actual size of the resource. |
| * |
| * Ex. |
| * jlong size; |
| * JImageLocationRef location = (*JImageFindResource)(image, "java.base", "9.0", "java/lang/String.class", &size); |
| * char* buffer = new char[size]; |
| * (*JImageGetResource)(image, location, buffer, size); |
| */ |
| extern "C" jlong JIMAGE_GetResource(JImageFile* jimage, JImageLocationRef location, |
| char* buffer, jlong size); |
| |
| typedef jlong(*JImageGetResource_t)(JImageFile* jimage, JImageLocationRef location, |
| char* buffer, jlong size); |
| |
| |
| /* |
| * JImageResourceIterator - Given an open image file (see JImageOpen), a visitor |
| * function and a visitor argument, iterator through each of the image's resources. |
| * The visitor function is called with the image file, the module name, the |
| * package name, the base name, the extension and the visitor argument. The return |
| * value of the visitor function should be true, unless an early iteration exit is |
| * required. All strings are utf-8, zero byte terminated.file. |
| * |
| * Ex. |
| * bool ctw_visitor(JImageFile* jimage, const char* module_name, const char* version, const char* package, const char* name, const char* extension, void* arg) { |
| * if (strcmp(extension, “class”) == 0) { |
| * char path[JIMAGE_MAX_PATH]; |
| * Thread* THREAD = Thread::current(); |
| * jio_snprintf(path, JIMAGE_MAX_PATH - 1, "/%s/%s", package, name); |
| * ClassLoader::compile_the_world_in(path, (Handle)arg, THREAD); |
| * return !HAS_PENDING_EXCEPTION; |
| * } |
| * return true; |
| * } |
| * (*JImageResourceIterator)(image, ctw_visitor, loader); |
| */ |
| |
| typedef bool (*JImageResourceVisitor_t)(JImageFile* jimage, |
| const char* module_name, const char* version, const char* package, |
| const char* name, const char* extension, void* arg); |
| |
| extern "C" void JIMAGE_ResourceIterator(JImageFile* jimage, |
| JImageResourceVisitor_t visitor, void *arg); |
| |
| typedef void (*JImageResourceIterator_t)(JImageFile* jimage, |
| JImageResourceVisitor_t visitor, void* arg); |