68 * file is shared by other uses, release and close is deferred until the last use
69 * is also closed.
70 *
71 * Ex.
72 * (*JImageClose)(image);
73 */
74 extern "C" void JIMAGE_Close(JImageFile* image) {
75 ImageFileReader::close((ImageFileReader*) image);
76 }
77
78 /*
79 * JImagePackageToModule - Given an open image file (see JImageOpen) and the name
80 * of a package, return the name of module where the package resides. If the
81 * package does not exist in the image file, the function returns NULL.
82 * The resulting string does/should not have to be released. All strings are
83 * utf-8, zero byte terminated.
84 *
85 * Ex.
86 * const char* package = (*JImagePackageToModule)(image, "java/lang");
87 * tty->print_cr(package);
88 * —> java.base
89 */
90 extern "C" const char* JIMAGE_PackageToModule(JImageFile* image, const char* package_name) {
91 return ((ImageFileReader*) image)->get_image_module_data()->package_to_module(package_name);
92 }
93
94 /*
95 * JImageFindResource - Given an open image file (see JImageOpen), a module
96 * name, a version string and the name of a class/resource, return location
97 * information describing the resource and its size. If no resource is found, the
98 * function returns JIMAGE_NOT_FOUND and the value of size is undefined.
99 * The version number should be "9.0" and is not used in locating the resource.
100 * The resulting location does/should not have to be released.
101 * All strings are utf-8, zero byte terminated.
102 *
103 * Ex.
104 * jlong size;
105 * JImageLocationRef location = (*JImageFindResource)(image,
106 * "java.base", "9.0", "java/lang/String.class", &size);
107 */
108 extern "C" JImageLocationRef JIMAGE_FindResource(JImageFile* image,
120 // If the concatenated string is too long for the buffer, return not found
121 if (1 + moduleNameLen + 1 + nameLen + 1 > IMAGE_MAX_PATH) {
122 return 0L;
123 }
124
125 index = 0;
126 fullpath[index++] = '/';
127 memcpy(&fullpath[index], module_name, moduleNameLen);
128 index += moduleNameLen;
129 fullpath[index++] = '/';
130 memcpy(&fullpath[index], name, nameLen);
131 index += nameLen;
132 fullpath[index++] = '\0';
133
134 JImageLocationRef loc =
135 (JImageLocationRef) ((ImageFileReader*) image)->find_location_index(fullpath, (u8*) size);
136 return loc;
137 }
138
139 /*
140 * JImageGetResource - Given an open image file (see JImageOpen), a resource’s
141 * location information (see JImageFindResource), a buffer of appropriate
142 * size and the size, retrieve the bytes associated with the
143 * resource. If the size is less than the resource size then the read is truncated.
144 * If the size is greater than the resource size then the remainder of the buffer
145 * is zero filled. The function will return the actual size of the resource.
146 *
147 * Ex.
148 * jlong size;
149 * JImageLocationRef location = (*JImageFindResource)(image,
150 * "java.base", "9.0", "java/lang/String.class", &size);
151 * char* buffer = new char[size];
152 * (*JImageGetResource)(image, location, buffer, size);
153 */
154 extern "C" jlong JIMAGE_GetResource(JImageFile* image, JImageLocationRef location,
155 char* buffer, jlong size) {
156 ((ImageFileReader*) image)->get_resource((u4) location, (u1*) buffer);
157 return size;
158 }
159
160 /*
161 * JImageResourceIterator - Given an open image file (see JImageOpen), a visitor
162 * function and a visitor argument, iterator through each of the image's resources.
163 * The visitor function is called with the image file, the module name, the
164 * package name, the base name, the extension and the visitor argument. The return
165 * value of the visitor function should be true, unless an early iteration exit is
166 * required. All strings are utf-8, zero byte terminated.file.
167 *
168 * Ex.
169 * bool ctw_visitor(JImageFile* jimage, const char* module_name, const char* version,
170 * const char* package, const char* name, const char* extension, void* arg) {
171 * if (strcmp(extension, “class”) == 0) {
172 * char path[JIMAGE_MAX_PATH];
173 * Thread* THREAD = Thread::current();
174 * jio_snprintf(path, JIMAGE_MAX_PATH - 1, "/%s/%s", package, name);
175 * ClassLoader::compile_the_world_in(path, (Handle)arg, THREAD);
176 * return !HAS_PENDING_EXCEPTION;
177 * }
178 * return true;
179 * }
180 * (*JImageResourceIterator)(image, ctw_visitor, loader);
181 */
182 extern "C" void JIMAGE_ResourceIterator(JImageFile* image,
183 JImageResourceVisitor_t visitor, void* arg) {
184 ImageFileReader* imageFile = (ImageFileReader*) image;
185 u4 nEntries = imageFile->table_length();
186 const ImageStrings strings = imageFile->get_strings();
187 for (u4 i = 0; i < nEntries; i++) {
188 ImageLocation location(imageFile->get_location_data(i));
189
190 u4 moduleOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_MODULE);
191 if (moduleOffset == 0) {
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68 * file is shared by other uses, release and close is deferred until the last use
69 * is also closed.
70 *
71 * Ex.
72 * (*JImageClose)(image);
73 */
74 extern "C" void JIMAGE_Close(JImageFile* image) {
75 ImageFileReader::close((ImageFileReader*) image);
76 }
77
78 /*
79 * JImagePackageToModule - Given an open image file (see JImageOpen) and the name
80 * of a package, return the name of module where the package resides. If the
81 * package does not exist in the image file, the function returns NULL.
82 * The resulting string does/should not have to be released. All strings are
83 * utf-8, zero byte terminated.
84 *
85 * Ex.
86 * const char* package = (*JImagePackageToModule)(image, "java/lang");
87 * tty->print_cr(package);
88 * -> java.base
89 */
90 extern "C" const char* JIMAGE_PackageToModule(JImageFile* image, const char* package_name) {
91 return ((ImageFileReader*) image)->get_image_module_data()->package_to_module(package_name);
92 }
93
94 /*
95 * JImageFindResource - Given an open image file (see JImageOpen), a module
96 * name, a version string and the name of a class/resource, return location
97 * information describing the resource and its size. If no resource is found, the
98 * function returns JIMAGE_NOT_FOUND and the value of size is undefined.
99 * The version number should be "9.0" and is not used in locating the resource.
100 * The resulting location does/should not have to be released.
101 * All strings are utf-8, zero byte terminated.
102 *
103 * Ex.
104 * jlong size;
105 * JImageLocationRef location = (*JImageFindResource)(image,
106 * "java.base", "9.0", "java/lang/String.class", &size);
107 */
108 extern "C" JImageLocationRef JIMAGE_FindResource(JImageFile* image,
120 // If the concatenated string is too long for the buffer, return not found
121 if (1 + moduleNameLen + 1 + nameLen + 1 > IMAGE_MAX_PATH) {
122 return 0L;
123 }
124
125 index = 0;
126 fullpath[index++] = '/';
127 memcpy(&fullpath[index], module_name, moduleNameLen);
128 index += moduleNameLen;
129 fullpath[index++] = '/';
130 memcpy(&fullpath[index], name, nameLen);
131 index += nameLen;
132 fullpath[index++] = '\0';
133
134 JImageLocationRef loc =
135 (JImageLocationRef) ((ImageFileReader*) image)->find_location_index(fullpath, (u8*) size);
136 return loc;
137 }
138
139 /*
140 * JImageGetResource - Given an open image file (see JImageOpen), a resource's
141 * location information (see JImageFindResource), a buffer of appropriate
142 * size and the size, retrieve the bytes associated with the
143 * resource. If the size is less than the resource size then the read is truncated.
144 * If the size is greater than the resource size then the remainder of the buffer
145 * is zero filled. The function will return the actual size of the resource.
146 *
147 * Ex.
148 * jlong size;
149 * JImageLocationRef location = (*JImageFindResource)(image,
150 * "java.base", "9.0", "java/lang/String.class", &size);
151 * char* buffer = new char[size];
152 * (*JImageGetResource)(image, location, buffer, size);
153 */
154 extern "C" jlong JIMAGE_GetResource(JImageFile* image, JImageLocationRef location,
155 char* buffer, jlong size) {
156 ((ImageFileReader*) image)->get_resource((u4) location, (u1*) buffer);
157 return size;
158 }
159
160 /*
161 * JImageResourceIterator - Given an open image file (see JImageOpen), a visitor
162 * function and a visitor argument, iterator through each of the image's resources.
163 * The visitor function is called with the image file, the module name, the
164 * package name, the base name, the extension and the visitor argument. The return
165 * value of the visitor function should be true, unless an early iteration exit is
166 * required. All strings are utf-8, zero byte terminated.file.
167 *
168 * Ex.
169 * bool ctw_visitor(JImageFile* jimage, const char* module_name, const char* version,
170 * const char* package, const char* name, const char* extension, void* arg) {
171 * if (strcmp(extension, "class") == 0) {
172 * char path[JIMAGE_MAX_PATH];
173 * Thread* THREAD = Thread::current();
174 * jio_snprintf(path, JIMAGE_MAX_PATH - 1, "/%s/%s", package, name);
175 * ClassLoader::compile_the_world_in(path, (Handle)arg, THREAD);
176 * return !HAS_PENDING_EXCEPTION;
177 * }
178 * return true;
179 * }
180 * (*JImageResourceIterator)(image, ctw_visitor, loader);
181 */
182 extern "C" void JIMAGE_ResourceIterator(JImageFile* image,
183 JImageResourceVisitor_t visitor, void* arg) {
184 ImageFileReader* imageFile = (ImageFileReader*) image;
185 u4 nEntries = imageFile->table_length();
186 const ImageStrings strings = imageFile->get_strings();
187 for (u4 i = 0; i < nEntries; i++) {
188 ImageLocation location(imageFile->get_location_data(i));
189
190 u4 moduleOffset = (u4) location.get_attribute(ImageLocation::ATTRIBUTE_MODULE);
191 if (moduleOffset == 0) {
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