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8245412: Better class definitions

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Reviewed-by: coleenp, rhalade, jwilhelm, skoivu
This commit is contained in:
Ioi Lam 2020-07-07 08:55:22 -07:00 • committed by Henry Jen
parent 00a5af44af
commit 24f7f84594
1 changed files with 24 additions and 4 deletions
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28
src/hotspot/share/oops/instanceKlass.cpp
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@ -2992,19 +2992,39 @@ bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetc
return(is_same_class_package(targetclassloader(), targetclassname));
}
static bool is_prohibited_package_slow(Symbol* class_name) {
// Caller has ResourceMark
int length;
jchar* unicode = class_name->as_unicode(length);
return (length >= 5 &&
unicode[0] == 'j' &&
unicode[1] == 'a' &&
unicode[2] == 'v' &&
unicode[3] == 'a' &&
unicode[4] == '/');
}
// Only boot and platform class loaders can define classes in "java/" packages.
void InstanceKlass::check_prohibited_package(Symbol* class_name,
ClassLoaderData* loader_data,
TRAPS) {
if (!loader_data->is_boot_class_loader_data() &&
!loader_data->is_platform_class_loader_data() &&
class_name != NULL) {
class_name != NULL && class_name->utf8_length() >= 5) {
ResourceMark rm(THREAD);
char* name = class_name->as_C_string();
if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
bool prohibited;
const u1* base = class_name->base();
if ((base[0] | base[1] | base[2] | base[3] | base[4]) & 0x80) {
prohibited = is_prohibited_package_slow(class_name);
} else {
char* name = class_name->as_C_string();
prohibited = (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/');
}
if (prohibited) {
TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
name = pkg_name->as_C_string();
char* name = pkg_name->as_C_string();
const char* class_loader_name = loader_data->loader_name_and_id();
StringUtils::replace_no_expand(name, "/", ".");
const char* msg_text1 = "Class loader (instance of): ";