| /* |
| * Copyright (c) 2014, 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 <string.h> |
| |
| #include "jimage.hpp" |
| |
| #include "imageFile.hpp" |
| |
| #define BOOT_VERSION "9.0" |
| |
| /* |
| * 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/bootmodules.jimage", &error); |
| * if (image == NULL) { |
| * tty->print_cr("JImage failed to open: %d", error); |
| * ... |
| * } |
| * ... |
| */ |
| extern "C" JImageFile* JIMAGE_Open(const char *name, jint* error) { |
| // TODO - return a meaningful error code |
| *error = 0; |
| ImageFileReader* jfile = ImageFileReader::open(name); |
| return (JImageFile*) jfile; |
| } |
| |
| /* |
| * 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* image) { |
| ImageFileReader::close((ImageFileReader*) image); |
| } |
| |
| /* |
| * 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* image, const char* package_name) { |
| return ((ImageFileReader*) image)->get_image_module_data()->package_to_module(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* image, |
| const char* module_name, const char* version, const char* name, |
| jlong* size) { |
| if (strcmp(version, BOOT_VERSION) != 0) { |
| return (JImageLocationRef) 0; |
| } |
| |
| ImageLocation location; |
| char fullpath[IMAGE_MAX_PATH]; |
| |
| // Concatenate to get full path |
| strncpy(fullpath, "/", IMAGE_MAX_PATH - 1); |
| strncat(fullpath, module_name, IMAGE_MAX_PATH - 1); |
| strncat(fullpath, "/", IMAGE_MAX_PATH - 1); |
| strncat(fullpath, name, IMAGE_MAX_PATH - 1); |
| JImageLocationRef loc = |
| (JImageLocationRef) ((ImageFileReader*) image)->find_location_index(fullpath, (u8*) size); |
| return loc; |
| } |
| |
| /* |
| * 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* image, JImageLocationRef location, |
| char* buffer, jlong size) { |
| ((ImageFileReader*) image)->get_resource((u4) location, (u1*) buffer); |
| return 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); |
| */ |
| extern "C" void JIMAGE_ResourceIterator(JImageFile* image, |
| JImageResourceVisitor_t visitor, void* arg) { |
| ImageFileReader* imageFile = (ImageFileReader*) image; |
| u4 nEntries = imageFile->table_length(); |
| const ImageStrings strings = imageFile->get_strings(); |
| for (u4 i = 0; i < nEntries; i++) { |
| ImageLocation location(imageFile->get_location_data(i)); |
| |
| u4 moduleOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_MODULE); |
| if (moduleOffset == 0) { |
| continue; // skip non-modules |
| } |
| const char *module = strings.get(moduleOffset); |
| if (strcmp(module, "modules") == 0 |
| || strcmp(module, "packages") == 0) { |
| continue; // always skip |
| } |
| |
| u4 parentOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_PARENT); |
| const char *parent = strings.get(parentOffset); |
| u4 baseOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_BASE); |
| const char *base = strings.get(baseOffset); |
| u4 extOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_EXTENSION); |
| const char *extension = strings.get(extOffset); |
| |
| if (!(*visitor)(image, module, "9", parent, base, extension, arg)) { |
| break; |
| } |
| |
| } |
| } |
| |