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243 lines
9.6 KiB
C++
243 lines
9.6 KiB
C++
/*
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include "jimage.hpp"
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#include "imageFile.hpp"
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/*
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* JImageOpen - Given the supplied full path file name, open an image file. This
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* function will also initialize tables and retrieve meta-data necessary to
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* satisfy other functions in the API. If the image file has been previously
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* open, a new open request will share memory and resources used by the previous
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* open. A call to JImageOpen should be balanced by a call to JImageClose, to
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* release memory and resources used. If the image file is not found or cannot
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* be open, then NULL is returned and error will contain a reason for the
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* failure; a positive value for a system error number, negative for a jimage
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* specific error (see JImage Error Codes.)
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*
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* Ex.
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* jint error;
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* JImageFile* jimage = (*JImageOpen)(JAVA_HOME "lib/modules", &error);
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* if (image == NULL) {
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* tty->print_cr("JImage failed to open: %d", error);
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* ...
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* }
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* ...
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*/
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extern "C" JNIEXPORT JImageFile* JNICALL
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JIMAGE_Open(const char *name, jint* error) {
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// TODO - return a meaningful error code
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*error = 0;
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ImageFileReader* jfile = ImageFileReader::open(name);
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return (JImageFile*) jfile;
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}
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/*
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* JImageClose - Given the supplied open image file (see JImageOpen), release
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* memory and resources used by the open file and close the file. If the image
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* file is shared by other uses, release and close is deferred until the last use
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* is also closed.
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*
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* Ex.
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* (*JImageClose)(image);
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*/
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extern "C" JNIEXPORT void JNICALL
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JIMAGE_Close(JImageFile* image) {
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ImageFileReader::close((ImageFileReader*) image);
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}
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/*
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* JImagePackageToModule - Given an open image file (see JImageOpen) and the name
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* of a package, return the name of module where the package resides. If the
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* package does not exist in the image file, the function returns NULL.
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* The resulting string does/should not have to be released. All strings are
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* utf-8, zero byte terminated.
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*
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* Ex.
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* const char* package = (*JImagePackageToModule)(image, "java/lang");
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* tty->print_cr(package);
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* -> java.base
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*/
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extern "C" JNIEXPORT const char* JNICALL
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JIMAGE_PackageToModule(JImageFile* image, const char* package_name) {
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return ((ImageFileReader*) image)->get_image_module_data()->package_to_module(package_name);
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}
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/*
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* JImageFindResource - Given an open image file (see JImageOpen), a module
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* name, a version string and the name of a class/resource, return location
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* information describing the resource and its size. If no resource is found, the
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* function returns JIMAGE_NOT_FOUND and the value of size is undefined.
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* The version number should be "9.0" and is not used in locating the resource.
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* The resulting location does/should not have to be released.
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* All strings are utf-8, zero byte terminated.
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*
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* Ex.
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* jlong size;
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* JImageLocationRef location = (*JImageFindResource)(image,
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* "java.base", "9.0", "java/lang/String.class", &size);
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*/
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extern "C" JNIEXPORT JImageLocationRef JNICALL
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JIMAGE_FindResource(JImageFile* image,
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const char* module_name, const char* version, const char* name,
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jlong* size) {
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// Concatenate to get full path
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char fullpath[IMAGE_MAX_PATH];
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size_t moduleNameLen = strlen(module_name);
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size_t nameLen = strlen(name);
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size_t index;
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// TBD: assert(moduleNameLen > 0 && "module name must be non-empty");
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assert(nameLen > 0 && "name must non-empty");
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// If the concatenated string is too long for the buffer, return not found
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if (1 + moduleNameLen + 1 + nameLen + 1 > IMAGE_MAX_PATH) {
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return 0L;
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}
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index = 0;
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fullpath[index++] = '/';
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memcpy(&fullpath[index], module_name, moduleNameLen);
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index += moduleNameLen;
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fullpath[index++] = '/';
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memcpy(&fullpath[index], name, nameLen);
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index += nameLen;
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fullpath[index++] = '\0';
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JImageLocationRef loc =
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(JImageLocationRef) ((ImageFileReader*) image)->find_location_index(fullpath, (u8*) size);
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return loc;
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}
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/*
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* JImageGetResource - Given an open image file (see JImageOpen), a resource's
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* location information (see JImageFindResource), a buffer of appropriate
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* size and the size, retrieve the bytes associated with the
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* resource. If the size is less than the resource size then the read is truncated.
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* If the size is greater than the resource size then the remainder of the buffer
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* is zero filled. The function will return the actual size of the resource.
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*
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* Ex.
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* jlong size;
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* JImageLocationRef location = (*JImageFindResource)(image,
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* "java.base", "9.0", "java/lang/String.class", &size);
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* char* buffer = new char[size];
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* (*JImageGetResource)(image, location, buffer, size);
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*/
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extern "C" JNIEXPORT jlong JNICALL
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JIMAGE_GetResource(JImageFile* image, JImageLocationRef location,
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char* buffer, jlong size) {
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((ImageFileReader*) image)->get_resource((u4) location, (u1*) buffer);
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return size;
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}
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/*
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* JImageResourceIterator - Given an open image file (see JImageOpen), a visitor
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* function and a visitor argument, iterator through each of the image's resources.
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* The visitor function is called with the image file, the module name, the
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* package name, the base name, the extension and the visitor argument. The return
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* value of the visitor function should be true, unless an early iteration exit is
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* required. All strings are utf-8, zero byte terminated.file.
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*
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* Ex.
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* bool ctw_visitor(JImageFile* jimage, const char* module_name, const char* version,
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* const char* package, const char* name, const char* extension, void* arg) {
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* if (strcmp(extension, "class") == 0) {
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* char path[JIMAGE_MAX_PATH];
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* Thread* THREAD = Thread::current();
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* jio_snprintf(path, JIMAGE_MAX_PATH - 1, "/%s/%s", package, name);
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* ClassLoader::compile_the_world_in(path, (Handle)arg, THREAD);
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* return !HAS_PENDING_EXCEPTION;
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* }
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* return true;
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* }
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* (*JImageResourceIterator)(image, ctw_visitor, loader);
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*/
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extern "C" JNIEXPORT void JNICALL
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JIMAGE_ResourceIterator(JImageFile* image,
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JImageResourceVisitor_t visitor, void* arg) {
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ImageFileReader* imageFile = (ImageFileReader*) image;
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u4 nEntries = imageFile->table_length();
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const ImageStrings strings = imageFile->get_strings();
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for (u4 i = 0; i < nEntries; i++) {
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ImageLocation location(imageFile->get_location_data(i));
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u4 moduleOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_MODULE);
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if (moduleOffset == 0) {
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continue; // skip non-modules
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}
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const char *module = strings.get(moduleOffset);
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if (strcmp(module, "modules") == 0
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|| strcmp(module, "packages") == 0) {
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continue; // always skip
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}
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u4 parentOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_PARENT);
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const char *parent = strings.get(parentOffset);
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u4 baseOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_BASE);
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const char *base = strings.get(baseOffset);
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u4 extOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_EXTENSION);
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const char *extension = strings.get(extOffset);
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if (!(*visitor)(image, module, "9", parent, base, extension, arg)) {
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break;
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}
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}
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}
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/*
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* JIMAGE_ResourcePath- Given an open image file, a location reference, a buffer
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* and a maximum buffer size, copy the path of the resource into the buffer.
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* Returns false if not a valid location reference.
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*
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* Ex.
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* JImageLocationRef location = ...
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* char path[JIMAGE_MAX_PATH];
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* (*JImageResourcePath)(image, location, path, JIMAGE_MAX_PATH);
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*/
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extern "C" JNIEXPORT bool JNICALL
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JIMAGE_ResourcePath(JImageFile* image, JImageLocationRef locationRef,
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char* path, size_t max) {
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ImageFileReader* imageFile = (ImageFileReader*) image;
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u4 offset = (u4) locationRef;
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if (offset >= imageFile->locations_size()) {
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return false;
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}
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ImageLocation location(imageFile->get_location_offset_data(offset));
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imageFile->location_path(location, path, max);
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return true;
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}
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