// BootstrapMethods_attribute {
// u2 attribute_name_index;
// u4 attribute_length;
// u2 num_bootstrap_methods;
// { u2 bootstrap_method_ref;
// u2 num_bootstrap_arguments;
// u2 bootstrap_arguments[num_bootstrap_arguments];
// } bootstrap_methods[num_bootstrap_methods];
// }
void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() {
Array<u2>* operands = cpool()->operands();
write_attribute_name_index("BootstrapMethods");
int num_bootstrap_methods = ConstantPool::operand_array_length(operands);
// calculate length of attribute
int length = sizeof(u2); // num_bootstrap_methods
for (int n = 0; n < num_bootstrap_methods; n++) {
u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
length += sizeof(u2); // bootstrap_method_ref
length += sizeof(u2); // num_bootstrap_arguments
length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments]
}
write_u4(length);
// write attribute
write_u2(num_bootstrap_methods);
for (int n = 0; n < num_bootstrap_methods; n++) {
u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n);
u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
write_u2(bootstrap_method_ref);
write_u2(num_bootstrap_arguments);
for (int arg = 0; arg < num_bootstrap_arguments; arg++) {
u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg);
write_u2(bootstrap_argument);
}
}
}
// Write the class attributes portion of ClassFile structure
// JVMSpec| u2 attributes_count;
// JVMSpec| attribute_info attributes[attributes_count];
void JvmtiClassFileReconstituter::write_class_attributes() {
u2 inner_classes_length = inner_classes_attribute_length();
Symbol* generic_signature = ikh()->generic_signature();
AnnotationArray* anno = ikh()->class_annotations();
AnnotationArray* type_anno = ikh()->class_type_annotations();
int attr_count = 0;
if (generic_signature != NULL) {
++attr_count;
}
if (ikh()->source_file_name() != NULL) {
++attr_count;
}
if (ikh()->source_debug_extension() != NULL) {
++attr_count;
}
if (inner_classes_length > 0) {
++attr_count;
}
if (anno != NULL) {
++attr_count; // has RuntimeVisibleAnnotations attribute
}
if (type_anno != NULL) {
++attr_count; // has RuntimeVisibleTypeAnnotations attribute
}
if (cpool()->operands() != NULL) {
++attr_count;
}
write_u2(attr_count);
if (generic_signature != NULL) {
write_signature_attribute(symbol_to_cpool_index(generic_signature));
}
if (ikh()->source_file_name() != NULL) {
write_source_file_attribute();
}
if (ikh()->source_debug_extension() != NULL) {
write_source_debug_extension_attribute();
}
if (inner_classes_length > 0) {
write_inner_classes_attribute(inner_classes_length);
}
if (anno != NULL) {
write_annotations_attribute("RuntimeVisibleAnnotations", anno);
}
if (type_anno != NULL) {
write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
}
if (cpool()->operands() != NULL) {
write_bootstrapmethod_attribute();
}
}
void copy_cpool_bytes(unsigned char *cpool_bytes) {
if (cpool_bytes == NULL) {
assert(cpool_bytes != NULL, "cpool_bytes pointer must not be NULL");
return;
}
cpool()->copy_cpool_bytes(cpool_size(), _symmap, cpool_bytes);
}
// ------------------------------------------------------------------
// ciBytecodeStream::get_declared_field_holder
//
// Get the declared holder of the currently referenced field.
//
// Usage note: the holder() of a ciField class returns the canonical
// holder of the field, rather than the holder declared in the
// bytecodes.
//
// There is no "will_link" result passed back. The user is responsible
// for checking linkability when retrieving the associated field.
ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {
VM_ENTRY_MARK;
constantPoolHandle cpool(_method->get_methodOop()->constants());
int holder_index = get_field_holder_index();
bool ignore;
return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder)
->as_instance_klass();
}
// ------------------------------------------------------------------
// ciBytecodeStream::get_constant
//
// If this bytecode is one of the ldc variants, get the referenced
// constant.
ciConstant ciBytecodeStream::get_constant() {
int pool_index = get_constant_raw_index();
int cache_index = -1;
if (has_cache_index()) {
cache_index = pool_index;
pool_index = -1;
}
VM_ENTRY_MARK;
constantPoolHandle cpool(_method->get_methodOop()->constants());
return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder);
}
void JvmtiClassFileReconstituter::write_class_file_format() {
ReallocMark();
// JVMSpec| ClassFile {
// JVMSpec| u4 magic;
write_u4(0xCAFEBABE);
// JVMSpec| u2 minor_version;
// JVMSpec| u2 major_version;
write_u2(ikh()->minor_version());
u2 major = ikh()->major_version();
write_u2(major);
// JVMSpec| u2 constant_pool_count;
// JVMSpec| cp_info constant_pool[constant_pool_count-1];
write_u2(cpool()->length());
copy_cpool_bytes(writeable_address(cpool_size()));
// JVMSpec| u2 access_flags;
write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
// JVMSpec| u2 this_class;
// JVMSpec| u2 super_class;
write_u2(class_symbol_to_cpool_index(ikh()->name()));
Klass* super_class = ikh()->super();
write_u2(super_class == NULL? 0 : // zero for java.lang.Object
class_symbol_to_cpool_index(super_class->name()));
// JVMSpec| u2 interfaces_count;
// JVMSpec| u2 interfaces[interfaces_count];
Array<Klass*>* interfaces = ikh()->local_interfaces();
int num_interfaces = interfaces->length();
write_u2(num_interfaces);
for (int index = 0; index < num_interfaces; index++) {
HandleMark hm(thread());
instanceKlassHandle iikh(thread(), interfaces->at(index));
write_u2(class_symbol_to_cpool_index(iikh->name()));
}
// JVMSpec| u2 fields_count;
// JVMSpec| field_info fields[fields_count];
write_field_infos();
// JVMSpec| u2 methods_count;
// JVMSpec| method_info methods[methods_count];
write_method_infos();
// JVMSpec| u2 attributes_count;
// JVMSpec| attribute_info attributes[attributes_count];
// JVMSpec| } /* end ClassFile 8?
write_class_attributes();
}
// ------------------------------------------------------------------
// ciExceptionHandler::catch_klass
//
// Get the exception klass that this handler catches.
ciInstanceKlass* ciExceptionHandler::catch_klass() {
VM_ENTRY_MARK;
assert(!is_catch_all(), "bad index");
if (_catch_klass == NULL) {
bool will_link;
assert(_loading_klass->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
constantPoolHandle cpool(_loading_klass->get_instanceKlass()->constants());
ciKlass* k = CURRENT_ENV->get_klass_by_index(cpool,
_catch_klass_index,
will_link,
_loading_klass);
if (!will_link && k->is_loaded()) {
GUARDED_VM_ENTRY(
k = CURRENT_ENV->get_unloaded_klass(_loading_klass, k->name());
)
}
// ------------------------------------------------------------------
// ciField::ciField
ciField::ciField(ciInstanceKlass* klass, int index): _known_to_link_with(NULL) {
ASSERT_IN_VM;
CompilerThread *thread = CompilerThread::current();
assert(ciObjectFactory::is_initialized(), "not a shared field");
assert(klass->get_instanceKlass()->is_linked(), "must be linked before using its constan-pool");
_cp_index = index;
constantPoolHandle cpool(thread, klass->get_instanceKlass()->constants());
// Get the field's name, signature, and type.
symbolHandle name (thread, cpool->name_ref_at(index));
_name = ciEnv::current(thread)->get_object(name())->as_symbol();
int nt_index = cpool->name_and_type_ref_index_at(index);
int sig_index = cpool->signature_ref_index_at(nt_index);
symbolHandle signature (thread, cpool->symbol_at(sig_index));
_signature = ciEnv::current(thread)->get_object(signature())->as_symbol();
BasicType field_type = FieldType::basic_type(signature());
// If the field is a pointer type, get the klass of the
// field.
if (field_type == T_OBJECT || field_type == T_ARRAY) {
bool ignore;
// This is not really a class reference; the index always refers to the
// field's type signature, as a symbol. Linkage checks do not apply.
_type = ciEnv::current(thread)->get_klass_by_index(cpool, sig_index, ignore, klass);
} else {
_type = ciType::make(field_type);
}
_name = (ciSymbol*)ciEnv::current(thread)->get_object(name());
// Get the field's declared holder.
//
// Note: we actually create a ciInstanceKlass for this klass,
// even though we may not need to.
int holder_index = cpool->klass_ref_index_at(index);
bool holder_is_accessible;
ciInstanceKlass* declared_holder =
ciEnv::current(thread)->get_klass_by_index(cpool, holder_index,
holder_is_accessible,
klass)->as_instance_klass();
// The declared holder of this field may not have been loaded.
// Bail out with partial field information.
if (!holder_is_accessible) {
// _cp_index and _type have already been set.
// The default values for _flags and _constant_value will suffice.
// We need values for _holder, _offset, and _is_constant,
_holder = declared_holder;
_offset = -1;
_is_constant = false;
return;
}
instanceKlass* loaded_decl_holder = declared_holder->get_instanceKlass();
// Perform the field lookup.
fieldDescriptor field_desc;
klassOop canonical_holder =
loaded_decl_holder->find_field(name(), signature(), &field_desc);
if (canonical_holder == NULL) {
// Field lookup failed. Will be detected by will_link.
_holder = declared_holder;
_offset = -1;
_is_constant = false;
return;
}
assert(canonical_holder == field_desc.field_holder(), "just checking");
initialize_from(&field_desc);
}
// ------------------------------------------------------------------
// ciBytecodeStream::get_klass
//
// If this bytecode is a new, newarray, multianewarray, instanceof,
// or checkcast, get the referenced klass.
ciKlass* ciBytecodeStream::get_klass(bool& will_link) {
VM_ENTRY_MARK;
constantPoolHandle cpool(_method->get_methodOop()->constants());
return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder);
}
