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8003985: Support @Contended Annotation - JEP 142

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HotSpot changes to support @Contended annotation.

Reviewed-by: coleenp, kvn, jrose
This commit is contained in:
Aleksey Shipilev 2013-01-14 15:17:47 +01:00 • committed by Jesper Wilhelmsson
parent ae35dfeeec
commit 0614ed6542
11 changed files with 617 additions and 92 deletions
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17
hotspot/agent/src/share/classes/sun/jvm/hotspot/oops/InstanceKlass.java
View file

@ -52,6 +52,8 @@ public class InstanceKlass extends Klass {
private static int LOW_OFFSET; private static int LOW_OFFSET;
private static int HIGH_OFFSET; private static int HIGH_OFFSET;
private static int FIELD_SLOTS; private static int FIELD_SLOTS;
private static short FIELDINFO_TAG_SIZE;
private static short FIELDINFO_TAG_OFFSET;
// ClassState constants // ClassState constants
private static int CLASS_STATE_ALLOCATED; private static int CLASS_STATE_ALLOCATED;
@ -96,9 +98,12 @@ public class InstanceKlass extends Klass {
NAME_INDEX_OFFSET = db.lookupIntConstant("FieldInfo::name_index_offset").intValue(); NAME_INDEX_OFFSET = db.lookupIntConstant("FieldInfo::name_index_offset").intValue();
SIGNATURE_INDEX_OFFSET = db.lookupIntConstant("FieldInfo::signature_index_offset").intValue(); SIGNATURE_INDEX_OFFSET = db.lookupIntConstant("FieldInfo::signature_index_offset").intValue();
INITVAL_INDEX_OFFSET = db.lookupIntConstant("FieldInfo::initval_index_offset").intValue(); INITVAL_INDEX_OFFSET = db.lookupIntConstant("FieldInfo::initval_index_offset").intValue();
LOW_OFFSET = db.lookupIntConstant("FieldInfo::low_offset").intValue(); LOW_OFFSET = db.lookupIntConstant("FieldInfo::low_packed_offset").intValue();
HIGH_OFFSET = db.lookupIntConstant("FieldInfo::high_offset").intValue(); HIGH_OFFSET = db.lookupIntConstant("FieldInfo::high_packed_offset").intValue();
FIELD_SLOTS = db.lookupIntConstant("FieldInfo::field_slots").intValue(); FIELD_SLOTS = db.lookupIntConstant("FieldInfo::field_slots").intValue();
FIELDINFO_TAG_SIZE = db.lookupIntConstant("FIELDINFO_TAG_SIZE").shortValue();
FIELDINFO_TAG_OFFSET = db.lookupIntConstant("FIELDINFO_TAG_OFFSET").shortValue();
// read ClassState constants // read ClassState constants
CLASS_STATE_ALLOCATED = db.lookupIntConstant("InstanceKlass::allocated").intValue(); CLASS_STATE_ALLOCATED = db.lookupIntConstant("InstanceKlass::allocated").intValue();
CLASS_STATE_LOADED = db.lookupIntConstant("InstanceKlass::loaded").intValue(); CLASS_STATE_LOADED = db.lookupIntConstant("InstanceKlass::loaded").intValue();
@ -314,8 +319,12 @@ public class InstanceKlass extends Klass {
public int getFieldOffset(int index) { public int getFieldOffset(int index) {
U2Array fields = getFields(); U2Array fields = getFields();
return VM.getVM().buildIntFromShorts(fields.at(index * FIELD_SLOTS + LOW_OFFSET), short lo = fields.at(index * FIELD_SLOTS + LOW_OFFSET);
fields.at(index * FIELD_SLOTS + HIGH_OFFSET)); short hi = fields.at(index * FIELD_SLOTS + HIGH_OFFSET);
if ((lo & FIELDINFO_TAG_SIZE) == FIELDINFO_TAG_OFFSET) {
return VM.getVM().buildIntFromShorts(lo, hi) >> FIELDINFO_TAG_SIZE;
}
throw new RuntimeException("should not reach here");
} }
// Accessors for declared fields // Accessors for declared fields

7
hotspot/src/cpu/sparc/vm/vm_version_sparc.cpp
View file

@ -259,6 +259,10 @@ void VM_Version::initialize() {
if (!has_vis1()) // Drop to 0 if no VIS1 support if (!has_vis1()) // Drop to 0 if no VIS1 support
UseVIS = 0; UseVIS = 0;
if (FLAG_IS_DEFAULT(ContendedPaddingWidth) &&
(cache_line_size > ContendedPaddingWidth))
ContendedPaddingWidth = cache_line_size;
#ifndef PRODUCT #ifndef PRODUCT
if (PrintMiscellaneous && Verbose) { if (PrintMiscellaneous && Verbose) {
tty->print("Allocation"); tty->print("Allocation");
@ -286,6 +290,9 @@ void VM_Version::initialize() {
if (PrefetchFieldsAhead > 0) { if (PrefetchFieldsAhead > 0) {
tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead); tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
} }
if (ContendedPaddingWidth > 0) {
tty->print_cr("ContendedPaddingWidth %d", ContendedPaddingWidth);
}
} }
#endif // PRODUCT #endif // PRODUCT
} }

7
hotspot/src/cpu/x86/vm/vm_version_x86.cpp
View file

@ -734,6 +734,10 @@ void VM_Version::get_processor_features() {
PrefetchFieldsAhead = prefetch_fields_ahead(); PrefetchFieldsAhead = prefetch_fields_ahead();
#endif #endif
if (FLAG_IS_DEFAULT(ContendedPaddingWidth) &&
(cache_line_size > ContendedPaddingWidth))
ContendedPaddingWidth = cache_line_size;
#ifndef PRODUCT #ifndef PRODUCT
if (PrintMiscellaneous && Verbose) { if (PrintMiscellaneous && Verbose) {
tty->print_cr("Logical CPUs per core: %u", tty->print_cr("Logical CPUs per core: %u",
@ -780,6 +784,9 @@ void VM_Version::get_processor_features() {
if (PrefetchFieldsAhead > 0) { if (PrefetchFieldsAhead > 0) {
tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead); tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
} }
if (ContendedPaddingWidth > 0) {
tty->print_cr("ContendedPaddingWidth %d", ContendedPaddingWidth);
}
} }
#endif // !PRODUCT #endif // !PRODUCT
} }

451
hotspot/src/share/vm/classfile/classFileParser.cpp
View file

@ -970,6 +970,12 @@ void ClassFileParser::parse_field_attributes(ClassLoaderData* loader_data,
runtime_visible_annotations_length = attribute_length; runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer(); runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations"); assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(loader_data,
runtime_visible_annotations,
runtime_visible_annotations_length,
cp,
parsed_annotations,
CHECK);
cfs->skip_u1(runtime_visible_annotations_length, CHECK); cfs->skip_u1(runtime_visible_annotations_length, CHECK);
} else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
runtime_invisible_annotations_length = attribute_length; runtime_invisible_annotations_length = attribute_length;
@ -1216,19 +1222,16 @@ Array<u2>* ClassFileParser::parse_fields(ClassLoaderData* loader_data,
field->initialize(access_flags.as_short(), field->initialize(access_flags.as_short(),
name_index, name_index,
signature_index, signature_index,
constantvalue_index, constantvalue_index);
0);
if (parsed_annotations.has_any_annotations())
parsed_annotations.apply_to(field);
BasicType type = cp->basic_type_for_signature_at(signature_index); BasicType type = cp->basic_type_for_signature_at(signature_index);
// Remember how many oops we encountered and compute allocation type // Remember how many oops we encountered and compute allocation type
FieldAllocationType atype = fac->update(is_static, type); FieldAllocationType atype = fac->update(is_static, type);
field->set_allocation_type(atype);
// The correct offset is computed later (all oop fields will be located together) // After field is initialized with type, we can augment it with aux info
// We temporarily store the allocation type in the offset field if (parsed_annotations.has_any_annotations())
field->set_offset(atype); parsed_annotations.apply_to(field);
} }
int index = length; int index = length;
@ -1259,17 +1262,13 @@ Array<u2>* ClassFileParser::parse_fields(ClassLoaderData* loader_data,
field->initialize(JVM_ACC_FIELD_INTERNAL, field->initialize(JVM_ACC_FIELD_INTERNAL,
injected[n].name_index, injected[n].name_index,
injected[n].signature_index, injected[n].signature_index,
0,
0); 0);
BasicType type = FieldType::basic_type(injected[n].signature()); BasicType type = FieldType::basic_type(injected[n].signature());
// Remember how many oops we encountered and compute allocation type // Remember how many oops we encountered and compute allocation type
FieldAllocationType atype = fac->update(false, type); FieldAllocationType atype = fac->update(false, type);
field->set_allocation_type(atype);
// The correct offset is computed later (all oop fields will be located together)
// We temporarily store the allocation type in the offset field
field->set_offset(atype);
index++; index++;
} }
} }
@ -1735,7 +1734,8 @@ int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
} }
// Sift through annotations, looking for those significant to the VM: // Sift through annotations, looking for those significant to the VM:
void ClassFileParser::parse_annotations(u1* buffer, int limit, void ClassFileParser::parse_annotations(ClassLoaderData* loader_data,
u1* buffer, int limit,
constantPoolHandle cp, constantPoolHandle cp,
ClassFileParser::AnnotationCollector* coll, ClassFileParser::AnnotationCollector* coll,
TRAPS) { TRAPS) {
@ -1752,9 +1752,12 @@ void ClassFileParser::parse_annotations(u1* buffer, int limit,
e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
e_size = 11, // end of 'e' annotation e_size = 11, // end of 'e' annotation
c_tag_val = 'c', c_tag_val = 'c', // payload is type
c_con_off = 7, // utf8 payload, such as 'I' or 'Ljava/lang/String;' c_con_off = 7, // utf8 payload, such as 'I'
c_size = 9, // end of 'c' annotation c_size = 9, // end of 'c' annotation
s_tag_val = 's', // payload is String
s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
s_size = 9,
min_size = 6 // smallest possible size (zero members) min_size = 6 // smallest possible size (zero members)
}; };
while ((--nann) >= 0 && (index-2 + min_size <= limit)) { while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
@ -1773,57 +1776,65 @@ void ClassFileParser::parse_annotations(u1* buffer, int limit,
} }
// Here is where parsing particular annotations will take place. // Here is where parsing particular annotations will take place.
AnnotationCollector::ID id = coll->annotation_index(aname); AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
if (id == AnnotationCollector::_unknown) continue; if (id == AnnotationCollector::_unknown) continue;
coll->set_annotation(id); coll->set_annotation(id);
// If there are no values, just set the bit and move on:
if (count == 0) continue;
// For the record, here is how annotation payloads can be collected. if (id == AnnotationCollector::_sun_misc_Contended) {
// Suppose we want to capture @Retention.value. Here is how: if (count == 1
//if (id == AnnotationCollector::_class_Retention) { && s_size == (index - index0) // match size
// Symbol* payload = NULL; && s_tag_val == *(abase + tag_off)
// if (count == 1 && member == vmSymbols::value_name()) {
// && e_size == (index0 - index) // match size u2 group_index = Bytes::get_Java_u2(abase + s_con_off);
// && e_tag_val == *(abase + tag_off) coll->set_contended_group(group_index);
// && (check_symbol_at(cp, Bytes::get_Java_u2(abase + e_type_off)) } else {
// == vmSymbols::RetentionPolicy_signature()) coll->set_contended_group(0); // default contended group
// && member == vmSymbols::value_name()) { }
// payload = check_symbol_at(cp, Bytes::get_Java_u2(abase + e_con_off)); coll->set_contended(true);
// } } else {
// check_property(payload != NULL, coll->set_contended(false);
// "Invalid @Retention annotation at offset %u in class file %s", }
// index0, CHECK);
// if (payload != NULL) {
// payload->increment_refcount();
// coll->_class_RetentionPolicy = payload;
// }
//}
} }
} }
ClassFileParser::AnnotationCollector::ID ClassFileParser::AnnotationCollector::annotation_index(Symbol* name) { ClassFileParser::AnnotationCollector::ID
ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
Symbol* name) {
vmSymbols::SID sid = vmSymbols::find_sid(name); vmSymbols::SID sid = vmSymbols::find_sid(name);
bool privileged = false;
if (loader_data->is_the_null_class_loader_data()) {
// Privileged code can use all annotations. Other code silently drops some.
privileged = true;
}
switch (sid) { switch (sid) {
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
if (_location != _in_method) break; // only allow for methods if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_ForceInline; return _method_ForceInline;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
if (_location != _in_method) break; // only allow for methods if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_DontInline; return _method_DontInline;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
if (_location != _in_method) break; // only allow for methods if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_LambdaForm_Compiled; return _method_LambdaForm_Compiled;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
if (_location != _in_method) break; // only allow for methods if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_LambdaForm_Hidden; return _method_LambdaForm_Hidden;
case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
return _sun_misc_Contended;
default: break; default: break;
} }
return AnnotationCollector::_unknown; return AnnotationCollector::_unknown;
} }
void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
fatal("no field annotations yet"); if (is_contended())
f->set_contended_group(contended_group());
} }
void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
@ -1838,7 +1849,7 @@ void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
} }
void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
fatal("no class annotations yet"); k->set_is_contended(is_contended());
} }
@ -2181,7 +2192,8 @@ methodHandle ClassFileParser::parse_method(ClassLoaderData* loader_data,
runtime_visible_annotations_length = method_attribute_length; runtime_visible_annotations_length = method_attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer(); runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations"); assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(runtime_visible_annotations, parse_annotations(loader_data,
runtime_visible_annotations,
runtime_visible_annotations_length, cp, &parsed_annotations, runtime_visible_annotations_length, cp, &parsed_annotations,
CHECK_(nullHandle)); CHECK_(nullHandle));
cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
@ -2886,7 +2898,8 @@ void ClassFileParser::parse_classfile_attributes(ClassLoaderData* loader_data,
runtime_visible_annotations_length = attribute_length; runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer(); runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations"); assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(runtime_visible_annotations, parse_annotations(loader_data,
runtime_visible_annotations,
runtime_visible_annotations_length, runtime_visible_annotations_length,
cp, cp,
parsed_annotations, parsed_annotations,
@ -3405,18 +3418,21 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
// Size of Java itable (in words) // Size of Java itable (in words)
itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces); itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
// get the padding width from the option
// TODO: Ask VM about specific CPU we are running on
int pad_size = ContendedPaddingWidth;
// Field size and offset computation // Field size and offset computation
int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size(); int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
#ifndef PRODUCT #ifndef PRODUCT
int orig_nonstatic_field_size = 0; int orig_nonstatic_field_size = 0;
#endif #endif
int static_field_size = 0;
int next_static_oop_offset; int next_static_oop_offset;
int next_static_double_offset; int next_static_double_offset;
int next_static_word_offset; int next_static_word_offset;
int next_static_short_offset; int next_static_short_offset;
int next_static_byte_offset; int next_static_byte_offset;
int next_static_type_offset; int next_static_padded_offset;
int next_nonstatic_oop_offset; int next_nonstatic_oop_offset;
int next_nonstatic_double_offset; int next_nonstatic_double_offset;
int next_nonstatic_word_offset; int next_nonstatic_word_offset;
@ -3426,11 +3442,36 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
int first_nonstatic_oop_offset; int first_nonstatic_oop_offset;
int first_nonstatic_field_offset; int first_nonstatic_field_offset;
int next_nonstatic_field_offset; int next_nonstatic_field_offset;
int next_nonstatic_padded_offset;
// Count the contended fields by type.
int static_contended_count = 0;
int nonstatic_contended_count = 0;
FieldAllocationCount fac_contended;
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
if (fs.is_contended()) {
fac_contended.count[atype]++;
if (fs.access_flags().is_static()) {
static_contended_count++;
} else {
nonstatic_contended_count++;
}
}
}
int contended_count = static_contended_count + nonstatic_contended_count;
// Calculate the starting byte offsets // Calculate the starting byte offsets
next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
// class is contended, pad before all the fields
if (parsed_annotations.is_contended()) {
next_static_oop_offset += pad_size;
}
next_static_double_offset = next_static_oop_offset + next_static_double_offset = next_static_oop_offset +
(fac.count[STATIC_OOP] * heapOopSize); ((fac.count[STATIC_OOP] - fac_contended.count[STATIC_OOP]) * heapOopSize);
if ( fac.count[STATIC_DOUBLE] && if ( fac.count[STATIC_DOUBLE] &&
(Universe::field_type_should_be_aligned(T_DOUBLE) || (Universe::field_type_should_be_aligned(T_DOUBLE) ||
Universe::field_type_should_be_aligned(T_LONG)) ) { Universe::field_type_should_be_aligned(T_LONG)) ) {
@ -3438,25 +3479,29 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
} }
next_static_word_offset = next_static_double_offset + next_static_word_offset = next_static_double_offset +
(fac.count[STATIC_DOUBLE] * BytesPerLong); ((fac.count[STATIC_DOUBLE] - fac_contended.count[STATIC_DOUBLE]) * BytesPerLong);
next_static_short_offset = next_static_word_offset + next_static_short_offset = next_static_word_offset +
(fac.count[STATIC_WORD] * BytesPerInt); ((fac.count[STATIC_WORD] - fac_contended.count[STATIC_WORD]) * BytesPerInt);
next_static_byte_offset = next_static_short_offset + next_static_byte_offset = next_static_short_offset +
(fac.count[STATIC_SHORT] * BytesPerShort); ((fac.count[STATIC_SHORT] - fac_contended.count[STATIC_SHORT]) * BytesPerShort);
next_static_type_offset = align_size_up((next_static_byte_offset + next_static_padded_offset = next_static_byte_offset +
fac.count[STATIC_BYTE] ), wordSize ); ((fac.count[STATIC_BYTE] - fac_contended.count[STATIC_BYTE]) * 1);
static_field_size = (next_static_type_offset -
next_static_oop_offset) / wordSize;
first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() + first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
nonstatic_field_size * heapOopSize; nonstatic_field_size * heapOopSize;
// class is contended, pad before all the fields
if (parsed_annotations.is_contended()) {
first_nonstatic_field_offset += pad_size;
}
next_nonstatic_field_offset = first_nonstatic_field_offset; next_nonstatic_field_offset = first_nonstatic_field_offset;
unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE]; unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD]; unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT]; unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE]; unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP]; unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
bool super_has_nonstatic_fields = bool super_has_nonstatic_fields =
(super_klass() != NULL && super_klass->has_nonstatic_fields()); (super_klass() != NULL && super_klass->has_nonstatic_fields());
@ -3529,12 +3574,12 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
} }
if( allocation_style == 0 ) { if( allocation_style == 0 ) {
// Fields order: oops, longs/doubles, ints, shorts/chars, bytes // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
next_nonstatic_oop_offset = next_nonstatic_field_offset; next_nonstatic_oop_offset = next_nonstatic_field_offset;
next_nonstatic_double_offset = next_nonstatic_oop_offset + next_nonstatic_double_offset = next_nonstatic_oop_offset +
(nonstatic_oop_count * heapOopSize); (nonstatic_oop_count * heapOopSize);
} else if( allocation_style == 1 ) { } else if( allocation_style == 1 ) {
// Fields order: longs/doubles, ints, shorts/chars, bytes, oops // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
next_nonstatic_double_offset = next_nonstatic_field_offset; next_nonstatic_double_offset = next_nonstatic_field_offset;
} else if( allocation_style == 2 ) { } else if( allocation_style == 2 ) {
// Fields allocation: oops fields in super and sub classes are together. // Fields allocation: oops fields in super and sub classes are together.
@ -3613,27 +3658,33 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
(nonstatic_word_count * BytesPerInt); (nonstatic_word_count * BytesPerInt);
next_nonstatic_byte_offset = next_nonstatic_short_offset + next_nonstatic_byte_offset = next_nonstatic_short_offset +
(nonstatic_short_count * BytesPerShort); (nonstatic_short_count * BytesPerShort);
next_nonstatic_padded_offset = next_nonstatic_byte_offset +
nonstatic_byte_count;
int notaligned_offset; // let oops jump before padding with this allocation style
if( allocation_style == 0 ) { if( allocation_style == 1 ) {
notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count; next_nonstatic_oop_offset = next_nonstatic_padded_offset;
} else { // allocation_style == 1
next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
if( nonstatic_oop_count > 0 ) { if( nonstatic_oop_count > 0 ) {
next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
} }
notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
} }
next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
- first_nonstatic_field_offset)/heapOopSize);
// Iterate over fields again and compute correct offsets. // Iterate over fields again and compute correct offsets.
// The field allocation type was temporarily stored in the offset slot. // The field allocation type was temporarily stored in the offset slot.
// oop fields are located before non-oop fields (static and non-static). // oop fields are located before non-oop fields (static and non-static).
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
// contended fields are handled below
if (fs.is_contended()) continue;
int real_offset; int real_offset;
FieldAllocationType atype = (FieldAllocationType) fs.offset(); FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
// pack the rest of the fields
switch (atype) { switch (atype) {
case STATIC_OOP: case STATIC_OOP:
real_offset = next_static_oop_offset; real_offset = next_static_oop_offset;
@ -3722,13 +3773,225 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
fs.set_offset(real_offset); fs.set_offset(real_offset);
} }
// Handle the contended cases.
//
// Each contended field should not intersect the cache line with another contended field.
// In the absence of alignment information, we end up with pessimistically separating
// the fields with full-width padding.
//
// Additionally, this should not break alignment for the fields, so we round the alignment up
// for each field.
if (contended_count > 0) {
// if there is at least one contended field, we need to have pre-padding for them
if (nonstatic_contended_count > 0) {
next_nonstatic_padded_offset += pad_size;
}
// collect all contended groups
BitMap bm(cp->size());
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
if (fs.is_contended()) {
bm.set_bit(fs.contended_group());
}
}
int current_group = -1;
while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
// skip non-contended fields and fields from different group
if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
// handle statics below
if (fs.access_flags().is_static()) continue;
int real_offset;
FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
switch (atype) {
case NONSTATIC_BYTE:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += 1;
break;
case NONSTATIC_SHORT:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerShort;
break;
case NONSTATIC_WORD:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerInt;
break;
case NONSTATIC_DOUBLE:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerLong;
break;
case NONSTATIC_OOP:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += heapOopSize;
// Create new oop map
nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
nonstatic_oop_map_count += 1;
if( first_nonstatic_oop_offset == 0 ) { // Undefined
first_nonstatic_oop_offset = real_offset;
}
break;
default:
ShouldNotReachHere();
}
if (fs.contended_group() == 0) {
// Contended group defines the equivalence class over the fields:
// the fields within the same contended group are not inter-padded.
// The only exception is default group, which does not incur the
// equivalence, and so requires intra-padding.
next_nonstatic_padded_offset += pad_size;
}
fs.set_offset(real_offset);
} // for
// Start laying out the next group.
// Note that this will effectively pad the last group in the back;
// this is expected to alleviate memory contention effects for
// subclass fields and/or adjacent object.
// If this was the default group, the padding is already in place.
if (current_group != 0) {
next_nonstatic_padded_offset += pad_size;
}
}
// handle static fields
// if there is at least one contended field, we need to have pre-padding for them
if (static_contended_count > 0) {
next_static_padded_offset += pad_size;
}
current_group = -1;
while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
// skip non-contended fields and fields from different group
if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
// non-statics already handled above
if (!fs.access_flags().is_static()) continue;
int real_offset;
FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
switch (atype) {
case STATIC_BYTE:
next_static_padded_offset = align_size_up(next_static_padded_offset, 1);
real_offset = next_static_padded_offset;
next_static_padded_offset += 1;
break;
case STATIC_SHORT:
next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerShort);
real_offset = next_static_padded_offset;
next_static_padded_offset += BytesPerShort;
break;
case STATIC_WORD:
next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerInt);
real_offset = next_static_padded_offset;
next_static_padded_offset += BytesPerInt;
break;
case STATIC_DOUBLE:
next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerLong);
real_offset = next_static_padded_offset;
next_static_padded_offset += BytesPerLong;
break;
case STATIC_OOP:
next_static_padded_offset = align_size_up(next_static_padded_offset, heapOopSize);
real_offset = next_static_padded_offset;
next_static_padded_offset += heapOopSize;
break;
default:
ShouldNotReachHere();
}
if (fs.contended_group() == 0) {
// Contended group defines the equivalence class over the fields:
// the fields within the same contended group are not inter-padded.
// The only exception is default group, which does not incur the
// equivalence, and so requires intra-padding.
next_static_padded_offset += pad_size;
}
fs.set_offset(real_offset);
} // for
// Start laying out the next group.
// Note that this will effectively pad the last group in the back;
// this is expected to alleviate memory contention effects for
// subclass fields and/or adjacent object.
// If this was the default group, the padding is already in place.
if (current_group != 0) {
next_static_padded_offset += pad_size;
}
}
} // handle contended
// Size of instances // Size of instances
int instance_size; int instance_size;
int notaligned_offset = next_nonstatic_padded_offset;
// Entire class is contended, pad in the back.
// This helps to alleviate memory contention effects for subclass fields
// and/or adjacent object.
if (parsed_annotations.is_contended()) {
notaligned_offset += pad_size;
next_static_padded_offset += pad_size;
}
int next_static_type_offset = align_size_up(next_static_padded_offset, wordSize);
int static_field_size = (next_static_type_offset -
InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
- first_nonstatic_field_offset)/heapOopSize);
next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize ); next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
instance_size = align_object_size(next_nonstatic_type_offset / wordSize); instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value"); assert(instance_size == align_object_size(align_size_up(
(instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize + ((parsed_annotations.is_contended()) ? pad_size : 0)),
wordSize) / wordSize), "consistent layout helper value");
// Number of non-static oop map blocks allocated at end of klass. // Number of non-static oop map blocks allocated at end of klass.
const unsigned int total_oop_map_count = const unsigned int total_oop_map_count =
@ -4008,6 +4271,18 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
} }
#endif #endif
#ifndef PRODUCT
if (PrintFieldLayout) {
print_field_layout(name,
fields,
cp,
instance_size,
first_nonstatic_field_offset,
next_nonstatic_field_offset,
next_static_type_offset);
}
#endif
// preserve result across HandleMark // preserve result across HandleMark
preserve_this_klass = this_klass(); preserve_this_klass = this_klass();
} }
@ -4020,6 +4295,38 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
return this_klass; return this_klass;
} }
void ClassFileParser::print_field_layout(Symbol* name,
Array<u2>* fields,
constantPoolHandle cp,
int instance_size,
int instance_fields_start,
int instance_fields_end,
int static_fields_end) {
tty->print("%s: field layout\n", name->as_klass_external_name());
tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
if (!fs.access_flags().is_static()) {
tty->print(" @%3d \"%s\" %s\n",
fs.offset(),
fs.name()->as_klass_external_name(),
fs.signature()->as_klass_external_name());
}
}
tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
if (fs.access_flags().is_static()) {
tty->print(" @%3d \"%s\" %s\n",
fs.offset(),
fs.name()->as_klass_external_name(),
fs.signature()->as_klass_external_name());
}
}
tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
tty->print("\n");
}
unsigned int unsigned int
ClassFileParser::compute_oop_map_count(instanceKlassHandle super, ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
unsigned int nonstatic_oop_map_count, unsigned int nonstatic_oop_map_count,

22
hotspot/src/share/vm/classfile/classFileParser.hpp
View file

@ -95,17 +95,20 @@ class ClassFileParser VALUE_OBJ_CLASS_SPEC {
_method_DontInline, _method_DontInline,
_method_LambdaForm_Compiled, _method_LambdaForm_Compiled,
_method_LambdaForm_Hidden, _method_LambdaForm_Hidden,
_sun_misc_Contended,
_annotation_LIMIT _annotation_LIMIT
}; };
const Location _location; const Location _location;
int _annotations_present; int _annotations_present;
u2 _contended_group;
AnnotationCollector(Location location) AnnotationCollector(Location location)
: _location(location), _annotations_present(0) : _location(location), _annotations_present(0)
{ {
assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
} }
// If this annotation name has an ID, report it (or _none). // If this annotation name has an ID, report it (or _none).
ID annotation_index(Symbol* name); ID annotation_index(ClassLoaderData* loader_data, Symbol* name);
// Set the annotation name: // Set the annotation name:
void set_annotation(ID id) { void set_annotation(ID id) {
assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
@ -114,6 +117,12 @@ class ClassFileParser VALUE_OBJ_CLASS_SPEC {
// Report if the annotation is present. // Report if the annotation is present.
bool has_any_annotations() { return _annotations_present != 0; } bool has_any_annotations() { return _annotations_present != 0; }
bool has_annotation(ID id) { return (nth_bit((int)id) & _annotations_present) != 0; } bool has_annotation(ID id) { return (nth_bit((int)id) & _annotations_present) != 0; }
void set_contended_group(u2 group) { _contended_group = group; }
u2 contended_group() { return _contended_group; }
void set_contended(bool contended) { set_annotation(_sun_misc_Contended); }
bool is_contended() { return has_annotation(_sun_misc_Contended); }
}; };
class FieldAnnotationCollector: public AnnotationCollector { class FieldAnnotationCollector: public AnnotationCollector {
public: public:
@ -177,6 +186,14 @@ class ClassFileParser VALUE_OBJ_CLASS_SPEC {
Array<AnnotationArray*>** fields_type_annotations, Array<AnnotationArray*>** fields_type_annotations,
u2* java_fields_count_ptr, TRAPS); u2* java_fields_count_ptr, TRAPS);
void print_field_layout(Symbol* name,
Array<u2>* fields,
constantPoolHandle cp,
int instance_size,
int instance_fields_start,
int instance_fields_end,
int static_fields_end);
// Method parsing // Method parsing
methodHandle parse_method(ClassLoaderData* loader_data, methodHandle parse_method(ClassLoaderData* loader_data,
constantPoolHandle cp, constantPoolHandle cp,
@ -247,7 +264,8 @@ class ClassFileParser VALUE_OBJ_CLASS_SPEC {
int runtime_invisible_annotations_length, TRAPS); int runtime_invisible_annotations_length, TRAPS);
int skip_annotation(u1* buffer, int limit, int index); int skip_annotation(u1* buffer, int limit, int index);
int skip_annotation_value(u1* buffer, int limit, int index); int skip_annotation_value(u1* buffer, int limit, int index);
void parse_annotations(u1* buffer, int limit, constantPoolHandle cp, void parse_annotations(ClassLoaderData* loader_data,
u1* buffer, int limit, constantPoolHandle cp,
/* Results (currently, only one result is supported): */ /* Results (currently, only one result is supported): */
AnnotationCollector* result, AnnotationCollector* result,
TRAPS); TRAPS);

3
hotspot/src/share/vm/classfile/vmSymbols.hpp
View file

@ -194,7 +194,10 @@
template(java_lang_VirtualMachineError, "java/lang/VirtualMachineError") \ template(java_lang_VirtualMachineError, "java/lang/VirtualMachineError") \
template(java_lang_StackOverflowError, "java/lang/StackOverflowError") \ template(java_lang_StackOverflowError, "java/lang/StackOverflowError") \
template(java_lang_StackTraceElement, "java/lang/StackTraceElement") \ template(java_lang_StackTraceElement, "java/lang/StackTraceElement") \
\
/* Concurrency support */ \
template(java_util_concurrent_locks_AbstractOwnableSynchronizer, "java/util/concurrent/locks/AbstractOwnableSynchronizer") \ template(java_util_concurrent_locks_AbstractOwnableSynchronizer, "java/util/concurrent/locks/AbstractOwnableSynchronizer") \
template(sun_misc_Contended_signature, "Lsun/misc/Contended;") \
\ \
/* class symbols needed by intrinsics */ \ /* class symbols needed by intrinsics */ \
VM_INTRINSICS_DO(VM_INTRINSIC_IGNORE, template, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE) \ VM_INTRINSICS_DO(VM_INTRINSIC_IGNORE, template, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE) \

144
hotspot/src/share/vm/oops/fieldInfo.hpp
View file

@ -43,14 +43,29 @@ class FieldInfo VALUE_OBJ_CLASS_SPEC {
public: public:
// fields // fields
// Field info extracted from the class file and stored // Field info extracted from the class file and stored
// as an array of 7 shorts // as an array of 6 shorts.
#define FIELDINFO_TAG_SIZE 2
#define FIELDINFO_TAG_BLANK 0
#define FIELDINFO_TAG_OFFSET 1
#define FIELDINFO_TAG_TYPE_PLAIN 2
#define FIELDINFO_TAG_TYPE_CONTENDED 3
#define FIELDINFO_TAG_MASK 3
// Packed field has the tag, and can be either of:
// hi bits <--------------------------- lo bits
// |---------high---------|---------low---------|
// ..........................................00 - blank
// [------------------offset----------------]01 - real field offset
// ......................[-------type-------]10 - plain field with type
// [--contention_group--][-------type-------]11 - contended field with type and contention group
enum FieldOffset { enum FieldOffset {
access_flags_offset = 0, access_flags_offset = 0,
name_index_offset = 1, name_index_offset = 1,
signature_index_offset = 2, signature_index_offset = 2,
initval_index_offset = 3, initval_index_offset = 3,
low_offset = 4, low_packed_offset = 4,
high_offset = 5, high_packed_offset = 5,
field_slots = 6 field_slots = 6
}; };
@ -76,17 +91,90 @@ class FieldInfo VALUE_OBJ_CLASS_SPEC {
void initialize(u2 access_flags, void initialize(u2 access_flags,
u2 name_index, u2 name_index,
u2 signature_index, u2 signature_index,
u2 initval_index, u2 initval_index) {
u4 offset) {
_shorts[access_flags_offset] = access_flags; _shorts[access_flags_offset] = access_flags;
_shorts[name_index_offset] = name_index; _shorts[name_index_offset] = name_index;
_shorts[signature_index_offset] = signature_index; _shorts[signature_index_offset] = signature_index;
_shorts[initval_index_offset] = initval_index; _shorts[initval_index_offset] = initval_index;
set_offset(offset); _shorts[low_packed_offset] = 0;
_shorts[high_packed_offset] = 0;
} }
u2 access_flags() const { return _shorts[access_flags_offset]; } u2 access_flags() const { return _shorts[access_flags_offset]; }
u4 offset() const { return build_int_from_shorts(_shorts[low_offset], _shorts[high_offset]); } u4 offset() const {
u2 lo = _shorts[low_packed_offset];
switch(lo & FIELDINFO_TAG_MASK) {
case FIELDINFO_TAG_OFFSET:
return build_int_from_shorts(_shorts[low_packed_offset], _shorts[high_packed_offset]) >> FIELDINFO_TAG_SIZE;
#ifndef PRODUCT
case FIELDINFO_TAG_TYPE_PLAIN:
ShouldNotReachHere2("Asking offset for the plain type field");
case FIELDINFO_TAG_TYPE_CONTENDED:
ShouldNotReachHere2("Asking offset for the contended type field");
case FIELDINFO_TAG_BLANK:
ShouldNotReachHere2("Asking offset for the blank field");
#endif
}
ShouldNotReachHere();
return 0;
}
bool is_contended() const {
u2 lo = _shorts[low_packed_offset];
switch(lo & FIELDINFO_TAG_MASK) {
case FIELDINFO_TAG_TYPE_PLAIN:
return false;
case FIELDINFO_TAG_TYPE_CONTENDED:
return true;
#ifndef PRODUCT
case FIELDINFO_TAG_OFFSET:
ShouldNotReachHere2("Asking contended flag for the field with offset");
case FIELDINFO_TAG_BLANK:
ShouldNotReachHere2("Asking contended flag for the blank field");
#endif
}
ShouldNotReachHere();
return false;
}
u2 contended_group() const {
u2 lo = _shorts[low_packed_offset];
switch(lo & FIELDINFO_TAG_MASK) {
case FIELDINFO_TAG_TYPE_PLAIN:
return 0;
case FIELDINFO_TAG_TYPE_CONTENDED:
return _shorts[high_packed_offset];
#ifndef PRODUCT
case FIELDINFO_TAG_OFFSET:
ShouldNotReachHere2("Asking the contended group for the field with offset");
case FIELDINFO_TAG_BLANK:
ShouldNotReachHere2("Asking the contended group for the blank field");
#endif
}
ShouldNotReachHere();
return 0;
}
u2 allocation_type() const {
u2 lo = _shorts[low_packed_offset];
switch(lo & FIELDINFO_TAG_MASK) {
case FIELDINFO_TAG_TYPE_PLAIN:
case FIELDINFO_TAG_TYPE_CONTENDED:
return (lo >> FIELDINFO_TAG_SIZE);
#ifndef PRODUCT
case FIELDINFO_TAG_OFFSET:
ShouldNotReachHere2("Asking the field type for field with offset");
case FIELDINFO_TAG_BLANK:
ShouldNotReachHere2("Asking the field type for the blank field");
#endif
}
ShouldNotReachHere();
return 0;
}
bool is_offset_set() const {
return (_shorts[low_packed_offset] & FIELDINFO_TAG_MASK) == FIELDINFO_TAG_OFFSET;
}
Symbol* name(constantPoolHandle cp) const { Symbol* name(constantPoolHandle cp) const {
int index = name_index(); int index = name_index();
@ -106,8 +194,46 @@ class FieldInfo VALUE_OBJ_CLASS_SPEC {
void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; }
void set_offset(u4 val) { void set_offset(u4 val) {
_shorts[low_offset] = extract_low_short_from_int(val); val = val << FIELDINFO_TAG_SIZE; // make room for tag
_shorts[high_offset] = extract_high_short_from_int(val); _shorts[low_packed_offset] = extract_low_short_from_int(val) | FIELDINFO_TAG_OFFSET;
_shorts[high_packed_offset] = extract_high_short_from_int(val);
}
void set_allocation_type(int type) {
u2 lo = _shorts[low_packed_offset];
switch(lo & FIELDINFO_TAG_MASK) {
case FIELDINFO_TAG_BLANK:
_shorts[low_packed_offset] = ((type << FIELDINFO_TAG_SIZE)) & 0xFFFF;
_shorts[low_packed_offset] &= ~FIELDINFO_TAG_MASK;
_shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_PLAIN;
return;
#ifndef PRODUCT
case FIELDINFO_TAG_TYPE_PLAIN:
case FIELDINFO_TAG_TYPE_CONTENDED:
case FIELDINFO_TAG_OFFSET:
ShouldNotReachHere2("Setting the field type with overwriting");
#endif
}
ShouldNotReachHere();
}
void set_contended_group(u2 val) {
u2 lo = _shorts[low_packed_offset];
switch(lo & FIELDINFO_TAG_MASK) {
case FIELDINFO_TAG_TYPE_PLAIN:
_shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_CONTENDED;
_shorts[high_packed_offset] = val;
return;
#ifndef PRODUCT
case FIELDINFO_TAG_TYPE_CONTENDED:
ShouldNotReachHere2("Overwriting contended group");
case FIELDINFO_TAG_BLANK:
ShouldNotReachHere2("Setting contended group for the blank field");
case FIELDINFO_TAG_OFFSET:
ShouldNotReachHere2("Setting contended group for field with offset");
#endif
}
ShouldNotReachHere();
} }
bool is_internal() const { bool is_internal() const {

17
hotspot/src/share/vm/oops/fieldStreams.hpp
View file

@ -160,9 +160,26 @@ class FieldStreamBase : public StackObj {
return field()->offset(); return field()->offset();
} }
int allocation_type() const {
return field()->allocation_type();
}
void set_offset(int offset) { void set_offset(int offset) {
field()->set_offset(offset); field()->set_offset(offset);
} }
bool is_offset_set() const {
return field()->is_offset_set();
}
bool is_contended() const {
return field()->is_contended();
}
int contended_group() const {
return field()->contended_group();
}
}; };
// Iterate over only the internal fields // Iterate over only the internal fields

14
hotspot/src/share/vm/oops/instanceKlass.hpp
View file

@ -230,7 +230,8 @@ class InstanceKlass: public Klass {
_misc_rewritten = 1 << 0, // methods rewritten. _misc_rewritten = 1 << 0, // methods rewritten.
_misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
_misc_should_verify_class = 1 << 2, // allow caching of preverification _misc_should_verify_class = 1 << 2, // allow caching of preverification
_misc_is_anonymous = 1 << 3 // has embedded _inner_classes field _misc_is_anonymous = 1 << 3, // has embedded _inner_classes field
_misc_is_contended = 1 << 4 // marked with contended annotation
}; };
u2 _misc_flags; u2 _misc_flags;
u2 _minor_version; // minor version number of class file u2 _minor_version; // minor version number of class file
@ -550,6 +551,17 @@ class InstanceKlass: public Klass {
return is_anonymous() ? java_mirror() : class_loader(); return is_anonymous() ? java_mirror() : class_loader();
} }
bool is_contended() const {
return (_misc_flags & _misc_is_contended) != 0;
}
void set_is_contended(bool value) {
if (value) {
_misc_flags |= _misc_is_contended;
} else {
_misc_flags &= ~_misc_is_contended;
}
}
// signers // signers
objArrayOop signers() const { return _signers; } objArrayOop signers() const { return _signers; }
void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); } void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }

14
hotspot/src/share/vm/runtime/globals.hpp
View file

@ -1075,7 +1075,7 @@ class CommandLineFlags {
\ \
product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
\ \
product(intx, hashCode, 0, \ product(intx, hashCode, 5, \
"(Unstable) select hashCode generation algorithm" ) \ "(Unstable) select hashCode generation algorithm" ) \
\ \
product(intx, WorkAroundNPTLTimedWaitHang, 1, \ product(intx, WorkAroundNPTLTimedWaitHang, 1, \
@ -1173,6 +1173,18 @@ class CommandLineFlags {
notproduct(bool, PrintCompactFieldsSavings, false, \ notproduct(bool, PrintCompactFieldsSavings, false, \
"Print how many words were saved with CompactFields") \ "Print how many words were saved with CompactFields") \
\ \
notproduct(bool, PrintFieldLayout, false, \
"Print field layout for each class") \
\
product(intx, ContendedPaddingWidth, 128, \
"How many bytes to pad the fields/classes marked @Contended with")\
\
product(bool, EnableContended, true, \
"Enable @Contended annotation support") \
\
product(bool, RestrictContended, true, \
"Restrict @Contended to trusted classes") \
\
product(bool, UseBiasedLocking, true, \ product(bool, UseBiasedLocking, true, \
"Enable biased locking in JVM") \ "Enable biased locking in JVM") \
\ \

11
hotspot/src/share/vm/runtime/vmStructs.cpp
View file

@ -2284,10 +2284,17 @@ typedef BinaryTreeDictionary<Metablock, FreeList> MetablockTreeDictionary;
declare_constant(FieldInfo::name_index_offset) \ declare_constant(FieldInfo::name_index_offset) \
declare_constant(FieldInfo::signature_index_offset) \ declare_constant(FieldInfo::signature_index_offset) \
declare_constant(FieldInfo::initval_index_offset) \ declare_constant(FieldInfo::initval_index_offset) \
declare_constant(FieldInfo::low_offset) \ declare_constant(FieldInfo::low_packed_offset) \
declare_constant(FieldInfo::high_offset) \ declare_constant(FieldInfo::high_packed_offset) \
declare_constant(FieldInfo::field_slots) \ declare_constant(FieldInfo::field_slots) \
\ \
/*************************************/ \
/* FieldInfo tag constants */ \
/*************************************/ \
\
declare_preprocessor_constant("FIELDINFO_TAG_SIZE", FIELDINFO_TAG_SIZE) \
declare_preprocessor_constant("FIELDINFO_TAG_OFFSET", FIELDINFO_TAG_OFFSET) \
\
/************************************************/ \ /************************************************/ \
/* InstanceKlass InnerClassAttributeOffset enum */ \ /* InstanceKlass InnerClassAttributeOffset enum */ \
/************************************************/ \ /************************************************/ \