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7168280: Eliminate the generic signature index slot from field array for field without generic signature

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Only allocate the generic signature index slot in the field array for field with generic signature attribute.

Reviewed-by: coleenp, dlong
This commit is contained in:
Jiangli Zhou 2012-05-21 14:10:35 -04:00
parent 57692966b7
commit 31e63d5a3a
12 changed files with 199 additions and 53 deletions
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74
hotspot/src/share/vm/classfile/classFileParser.cpp
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@ -1082,12 +1082,36 @@ typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
int num_injected = 0;
InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
int total_fields = length + num_injected;
// Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
typeArrayOop new_fields = oopFactory::new_permanent_shortArray((length + num_injected) * FieldInfo::field_slots, CHECK_(nullHandle));
typeArrayHandle fields(THREAD, new_fields);
// The field array starts with tuples of shorts
// [access, name index, sig index, initial value index, byte offset].
// A generic signature slot only exists for field with generic
// signature attribute. And the access flag is set with
// JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
// signature slots are at the end of the field array and after all
// other fields data.
//
// f1: [access, name index, sig index, initial value index, low_offset, high_offset]
// f2: [access, name index, sig index, initial value index, low_offset, high_offset]
// ...
// fn: [access, name index, sig index, initial value index, low_offset, high_offset]
// [generic signature index]
// [generic signature index]
// ...
//
// Allocate a temporary resource array for field data. For each field,
// a slot is reserved in the temporary array for the generic signature
// index. After parsing all fields, the data are copied to a permanent
// array and any unused slots will be discarded.
ResourceMark rm(THREAD);
u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
typeArrayHandle field_annotations;
// The generic signature slots start after all other fields' data.
int generic_signature_slot = total_fields * FieldInfo::field_slots;
int num_generic_signature = 0;
for (int n = 0; n < length; n++) {
cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
@ -1135,14 +1159,19 @@ typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
if (is_synthetic) {
access_flags.set_is_synthetic();
}
if (generic_signature_index != 0) {
access_flags.set_field_has_generic_signature();
fa[generic_signature_slot] = generic_signature_index;
generic_signature_slot ++;
num_generic_signature ++;
}
}
FieldInfo* field = FieldInfo::from_field_array(fields(), n);
FieldInfo* field = FieldInfo::from_field_array(fa, n);
field->initialize(access_flags.as_short(),
name_index,
signature_index,
constantvalue_index,
generic_signature_index,
0);
BasicType type = cp->basic_type_for_signature_at(signature_index);
@ -1155,8 +1184,8 @@ typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
field->set_offset(atype);
}
int index = length;
if (num_injected != 0) {
int index = length;
for (int n = 0; n < num_injected; n++) {
// Check for duplicates
if (injected[n].may_be_java) {
@ -1164,7 +1193,7 @@ typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
Symbol* signature = injected[n].signature();
bool duplicate = false;
for (int i = 0; i < length; i++) {
FieldInfo* f = FieldInfo::from_field_array(fields(), i);
FieldInfo* f = FieldInfo::from_field_array(fa, i);
if (name == cp->symbol_at(f->name_index()) &&
signature == cp->symbol_at(f->signature_index())) {
// Symbol is desclared in Java so skip this one
@ -1179,12 +1208,11 @@ typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
}
// Injected field
FieldInfo* field = FieldInfo::from_field_array(fields(), index);
FieldInfo* field = FieldInfo::from_field_array(fa, index);
field->initialize(JVM_ACC_FIELD_INTERNAL,
injected[n].name_index,
injected[n].signature_index,
0,
0,
0);
BasicType type = FieldType::basic_type(injected[n].signature());
@ -1197,17 +1225,27 @@ typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
field->set_offset(atype);
index++;
}
}
if (index < length + num_injected) {
// sometimes injected fields already exist in the Java source so
// the fields array could be too long. In that case trim the
// fields array.
new_fields = oopFactory::new_permanent_shortArray(index * FieldInfo::field_slots, CHECK_(nullHandle));
for (int i = 0; i < index * FieldInfo::field_slots; i++) {
new_fields->short_at_put(i, fields->short_at(i));
}
fields = new_fields;
// Now copy the fields' data from the temporary resource array.
// Sometimes injected fields already exist in the Java source so
// the fields array could be too long. In that case the
// fields array is trimed. Also unused slots that were reserved
// for generic signature indexes are discarded.
typeArrayOop new_fields = oopFactory::new_permanent_shortArray(
index * FieldInfo::field_slots + num_generic_signature,
CHECK_(nullHandle));
typeArrayHandle fields(THREAD, new_fields);
{
int i = 0;
for (; i < index * FieldInfo::field_slots; i++) {
new_fields->short_at_put(i, fa[i]);
}
for (int j = total_fields * FieldInfo::field_slots;
j < generic_signature_slot; j++) {
new_fields->short_at_put(i++, fa[j]);
}
assert(i == new_fields->length(), "");
}
if (_need_verify && length > 1) {