// Check if there are any JVM TI prefixes which have been applied to the native method name.
// If any are found, remove them before attemping the look up of the
// native implementation again.
// See SetNativeMethodPrefix in the JVM TI Spec for more details.
address NativeLookup::lookup_entry_prefixed(methodHandle method, bool& in_base_library, TRAPS) {
ResourceMark rm(THREAD);
int prefix_count;
char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
char* in_name = method->name()->as_C_string();
char* wrapper_name = in_name;
// last applied prefix will be first -- go backwards
for (int i = prefix_count-1; i >= 0; i--) {
char* prefix = prefixes[i];
size_t prefix_len = strlen(prefix);
if (strncmp(prefix, wrapper_name, prefix_len) == 0) {
// has this prefix remove it
wrapper_name += prefix_len;
}
}
if (wrapper_name != in_name) {
// we have a name for a wrapping method
int wrapper_name_len = (int)strlen(wrapper_name);
TempNewSymbol wrapper_symbol = SymbolTable::probe(wrapper_name, wrapper_name_len);
if (wrapper_symbol != NULL) {
KlassHandle kh(method->method_holder());
methodOop wrapper_method = Klass::cast(kh())->lookup_method(wrapper_symbol,
method->signature());
if (wrapper_method != NULL && !wrapper_method->is_native()) {
// we found a wrapper method, use its native entry
method->set_is_prefixed_native();
return lookup_entry(wrapper_method, in_base_library, THREAD);
}
}
}
return NULL;
}
NativeSignatureIterator(methodHandle method) : SignatureIterator(method->signature()) {
_method = method;
_offset = 0;
_jni_offset = 0;
const int JNIEnv_words = 1;
const int mirror_words = 1;
_prepended = !is_static() ? JNIEnv_words : JNIEnv_words + mirror_words;
}
VerificationType StackMapFrame::set_locals_from_arg(
const methodHandle m, VerificationType thisKlass, TRAPS) {
SignatureStream ss(m->signature());
int init_local_num = 0;
if (!m->is_static()) {
init_local_num++;
// add one extra argument for instance method
if (m->name() == vmSymbols::object_initializer_name() &&
thisKlass.name() != vmSymbols::java_lang_Object()) {
_locals[0] = VerificationType::uninitialized_this_type();
_flags |= FLAG_THIS_UNINIT;
} else {
_locals[0] = thisKlass;
}
}
// local num may be greater than size of parameters because long/double occupies two slots
while(!ss.at_return_type()) {
init_local_num += _verifier->change_sig_to_verificationType(
&ss, &_locals[init_local_num],
CHECK_VERIFY_(verifier(), VerificationType::bogus_type()));
ss.next();
}
_locals_size = init_local_num;
switch (ss.type()) {
case T_OBJECT:
case T_ARRAY:
{
Symbol* sig = ss.as_symbol(CHECK_(VerificationType::bogus_type()));
// Create another symbol to save as signature stream unreferences
// this symbol.
Symbol* sig_copy =
verifier()->create_temporary_symbol(sig, 0, sig->utf8_length(),
CHECK_(VerificationType::bogus_type()));
assert(sig_copy == sig, "symbols don't match");
return VerificationType::reference_type(sig_copy);
}
case T_INT: return VerificationType::integer_type();
case T_BYTE: return VerificationType::byte_type();
case T_CHAR: return VerificationType::char_type();
case T_SHORT: return VerificationType::short_type();
case T_BOOLEAN: return VerificationType::boolean_type();
case T_FLOAT: return VerificationType::float_type();
case T_DOUBLE: return VerificationType::double_type();
case T_LONG: return VerificationType::long_type();
case T_VOID: return VerificationType::bogus_type();
default:
ShouldNotReachHere();
}
return VerificationType::bogus_type();
}
void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) {
assert(method->name() == vmSymbols::object_initializer_name(), "Should only be called for default constructor");
assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor");
InstanceKlass* ik = method->method_holder();
if (ik->is_initialized() && ik->has_vanilla_constructor()) {
// safe to skip constructor call
} else {
static JavaValue result(T_VOID);
JavaCallArguments args(receiver);
call(&result, method, &args, CHECK);
}
}
// Check all the formats of native implementation name to see if there is one
// for the specified method.
address NativeLookup::lookup_critical_entry(methodHandle method) {
if (!CriticalJNINatives) return NULL;
if (method->is_synchronized() ||
!method->is_static()) {
// Only static non-synchronized methods are allowed
return NULL;
}
ResourceMark rm;
address entry = NULL;
Symbol* signature = method->signature();
for (int end = 0; end < signature->utf8_length(); end++) {
if (signature->byte_at(end) == 'L') {
// Don't allow object types
return NULL;
}
}
// Compute critical name
char* critical_name = critical_jni_name(method);
// Compute argument size
int args_size = 1 // JNIEnv
+ (method->is_static() ? 1 : 0) // class for static methods
+ method->size_of_parameters(); // actual parameters
// 1) Try JNI short style
entry = lookup_critical_style(method, critical_name, "", args_size, true);
if (entry != NULL) return entry;
// Compute long name
char* long_name = long_jni_name(method);
// 2) Try JNI long style
entry = lookup_critical_style(method, critical_name, long_name, args_size, true);
if (entry != NULL) return entry;
// 3) Try JNI short style without os prefix/suffix
entry = lookup_critical_style(method, critical_name, "", args_size, false);
if (entry != NULL) return entry;
// 4) Try JNI long style without os prefix/suffix
entry = lookup_critical_style(method, critical_name, long_name, args_size, false);
return entry; // NULL indicates not found
}
Fingerprinter(methodHandle method) : SignatureIterator(method->signature()) {
mh = method;
_fingerprint = 0;
}
Fingerprinter(Thread *thread, methodHandle method) : SignatureIterator(thread, method->signature()) {
mh = method;
_fingerprint = 0;
}
