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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/oops/fieldStreams.hpp
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@ -42,21 +42,57 @@ class FieldStreamBase : public StackObj {
constantPoolHandle _constants;
int _index;
int _limit;
int _generic_signature_slot;
FieldInfo* field() const { return FieldInfo::from_field_array(_fields(), _index); }
int init_generic_signature_start_slot() {
int length = _fields->length();
int num_fields = 0;
int skipped_generic_signature_slots = 0;
FieldInfo* fi;
AccessFlags flags;
/* Scan from 0 to the current _index. Count the number of generic
signature slots for field[0] to field[_index - 1]. */
for (int i = 0; i < _index; i++) {
fi = FieldInfo::from_field_array(_fields(), i);
flags.set_flags(fi->access_flags());
if (flags.field_has_generic_signature()) {
length --;
skipped_generic_signature_slots ++;
}
}
/* Scan from the current _index. */
for (int i = _index; i*FieldInfo::field_slots < length; i++) {
fi = FieldInfo::from_field_array(_fields(), i);
flags.set_flags(fi->access_flags());
if (flags.field_has_generic_signature()) {
length --;
}
num_fields ++;
}
_generic_signature_slot = length + skipped_generic_signature_slots;
assert(_generic_signature_slot <= _fields->length(), "");
return num_fields;
}
FieldStreamBase(typeArrayHandle fields, constantPoolHandle constants, int start, int limit) {
_fields = fields;
_constants = constants;
_index = start;
_limit = limit;
int num_fields = init_generic_signature_start_slot();
if (limit < start) {
_limit = num_fields;
} else {
_limit = limit;
}
}
FieldStreamBase(typeArrayHandle fields, constantPoolHandle constants) {
_fields = fields;
_constants = constants;
_index = 0;
_limit = fields->length() / FieldInfo::field_slots;
_limit = init_generic_signature_start_slot();
}
public:
@ -65,18 +101,26 @@ class FieldStreamBase : public StackObj {
_constants = klass->constants();
_index = 0;
_limit = klass->java_fields_count();
init_generic_signature_start_slot();
}
FieldStreamBase(instanceKlassHandle klass) {
_fields = klass->fields();
_constants = klass->constants();
_index = 0;
_limit = klass->java_fields_count();
init_generic_signature_start_slot();
}
// accessors
int index() const { return _index; }
void next() { _index += 1; }
void next() {
if (access_flags().field_has_generic_signature()) {
_generic_signature_slot ++;
assert(_generic_signature_slot <= _fields->length(), "");
}
_index += 1;
}
bool done() const { return _index >= _limit; }
// Accessors for current field
@ -103,7 +147,13 @@ class FieldStreamBase : public StackObj {
}
Symbol* generic_signature() const {
return field()->generic_signature(_constants);
if (access_flags().field_has_generic_signature()) {
assert(_generic_signature_slot < _fields->length(), "out of bounds");
int index = _fields->short_at(_generic_signature_slot);
return _constants->symbol_at(index);
} else {
return NULL;
}
}
int offset() const {
@ -139,11 +189,19 @@ class JavaFieldStream : public FieldStreamBase {
}
int generic_signature_index() const {
assert(!field()->is_internal(), "regular only");
return field()->generic_signature_index();
if (access_flags().field_has_generic_signature()) {
assert(_generic_signature_slot < _fields->length(), "out of bounds");
return _fields->short_at(_generic_signature_slot);
} else {
return 0;
}
}
void set_generic_signature_index(int index) {
assert(!field()->is_internal(), "regular only");
field()->set_generic_signature_index(index);
if (access_flags().field_has_generic_signature()) {
assert(_generic_signature_slot < _fields->length(), "out of bounds");
_fields->short_at_put(_generic_signature_slot, index);
}
}
int initval_index() const {
assert(!field()->is_internal(), "regular only");
@ -159,8 +217,8 @@ class JavaFieldStream : public FieldStreamBase {
// Iterate over only the internal fields
class InternalFieldStream : public FieldStreamBase {
public:
InternalFieldStream(instanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), k->all_fields_count()) {}
InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), k->all_fields_count()) {}
InternalFieldStream(instanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}
InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}
};