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8138600: eliminate the need of ModuleLoaderMap.dat for CDS

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Removed the code which generates the ModuleLoaderMap.dat and the code which references it

Reviewed-by: mchung, jiangli
This commit is contained in:
Calvin Cheung 2017-09-29 10:11:01 -07:00
parent e31bc5637a
commit 6213838f11
5 changed files with 5 additions and 147 deletions
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108
src/hotspot/share/classfile/classLoader.cpp
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@ -802,7 +802,6 @@ void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_searc
if (DumpSharedSpaces) {
JImageFile *jimage = _jrt_entry->jimage();
assert(jimage != NULL, "No java runtime image file present");
ClassLoader::initialize_module_loader_map(jimage);
}
#endif
}
@ -1144,61 +1143,6 @@ int ClassLoader::crc32(int crc, const char* buf, int len) {
return (*Crc32)(crc, (const jbyte*)buf, len);
}
#if INCLUDE_CDS
void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
if (!DumpSharedSpaces) {
return; // only needed for CDS dump time
}
ResourceMark rm;
jlong size;
JImageLocationRef location = (*JImageFindResource)(jimage, JAVA_BASE_NAME, get_jimage_version_string(), MODULE_LOADER_MAP, &size);
if (location == 0) {
vm_exit_during_initialization(
"Cannot find ModuleLoaderMap location from modules jimage.", NULL);
}
char* buffer = NEW_RESOURCE_ARRAY(char, size + 1);
buffer[size] = '\0';
jlong read = (*JImageGetResource)(jimage, location, buffer, size);
if (read != size) {
vm_exit_during_initialization(
"Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
}
char* char_buf = (char*)buffer;
int buflen = (int)strlen(char_buf);
char* begin_ptr = char_buf;
char* end_ptr = strchr(begin_ptr, '\n');
bool process_boot_modules = false;
_boot_modules_array = new (ResourceObj::C_HEAP, mtModule)
GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
_platform_modules_array = new (ResourceObj::C_HEAP, mtModule)
GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
// Allocate a buffer from the C heap to be appended to the _boot_modules_array
// or the _platform_modules_array.
char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
temp_name[end_ptr - begin_ptr] = '\0';
if (strncmp(temp_name, "BOOT", 4) == 0) {
process_boot_modules = true;
FREE_C_HEAP_ARRAY(char, temp_name);
} else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
process_boot_modules = false;
FREE_C_HEAP_ARRAY(char, temp_name);
} else {
// module name
if (process_boot_modules) {
_boot_modules_array->append(temp_name);
} else {
_platform_modules_array->append(temp_name);
}
}
begin_ptr = ++end_ptr;
end_ptr = strchr(begin_ptr, '\n');
}
}
#endif
// Function add_package extracts the package from the fully qualified class name
// and checks if the package is in the boot loader's package entry table. If so,
// then it sets the classpath_index in the package entry record.
@ -1290,58 +1234,6 @@ objArrayOop ClassLoader::get_system_packages(TRAPS) {
return result();
}
#if INCLUDE_CDS
s2 ClassLoader::module_to_classloader(const char* module_name) {
assert(DumpSharedSpaces, "dump time only");
assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
int array_size = _boot_modules_array->length();
for (int i = 0; i < array_size; i++) {
if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
return BOOT_LOADER;
}
}
array_size = _platform_modules_array->length();
for (int i = 0; i < array_size; i++) {
if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
return PLATFORM_LOADER;
}
}
return APP_LOADER;
}
s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) {
assert(DumpSharedSpaces, "Only used for CDS dump time");
// obtain the classloader type based on the class name.
// First obtain the package name based on the class name. Then obtain
// the classloader type based on the package name from the jimage using
// a jimage API. If the classloader type cannot be found from the
// jimage, it is determined by the class path entry.
jshort loader_type = ClassLoader::APP_LOADER;
if (e->is_jrt()) {
ResourceMark rm;
TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0);
if (pkg_name != NULL) {
const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
JImageFile* jimage = cpie->jimage();
char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
if (module_name != NULL) {
loader_type = ClassLoader::module_to_classloader(module_name);
}
}
} else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
loader_type = ClassLoader::BOOT_LOADER;
}
return loader_type;
}
#endif
// caller needs ResourceMark
const char* ClassLoader::file_name_for_class_name(const char* class_name,
int class_name_len) {