Mercurial > hg > graal-compiler
view src/share/vm/oops/fieldInfo.hpp @ 12979:1d1ea10fe09f
8015255: NPG: Don't waste fragment at the end of a VirtualSpaceNode before retiring it.
Summary: Chunk up the last piece of committed memory in a VSN when getting a new one.
Reviewed-by: stefank, jmasa
author | mgerdin |
---|---|
date | Tue, 15 Oct 2013 13:56:46 +0200 |
parents | edb5ab0f3fe5 |
children | de6a9e811145 |
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/* * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_OOPS_FIELDINFO_HPP #define SHARE_VM_OOPS_FIELDINFO_HPP #include "oops/constantPool.hpp" #include "oops/typeArrayOop.hpp" #include "classfile/vmSymbols.hpp" // This class represents the field information contained in the fields // array of an InstanceKlass. Currently it's laid on top an array of // Java shorts but in the future it could simply be used as a real // array type. FieldInfo generally shouldn't be used directly. // Fields should be queried either through InstanceKlass or through // the various FieldStreams. class FieldInfo VALUE_OBJ_CLASS_SPEC { friend class fieldDescriptor; friend class JavaFieldStream; friend class ClassFileParser; public: // fields // Field info extracted from the class file and stored // 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 { access_flags_offset = 0, name_index_offset = 1, signature_index_offset = 2, initval_index_offset = 3, low_packed_offset = 4, high_packed_offset = 5, field_slots = 6 }; private: u2 _shorts[field_slots]; void set_name_index(u2 val) { _shorts[name_index_offset] = val; } void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; } void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; } u2 name_index() const { return _shorts[name_index_offset]; } u2 signature_index() const { return _shorts[signature_index_offset]; } u2 initval_index() const { return _shorts[initval_index_offset]; } public: static FieldInfo* from_field_array(Array<u2>* fields, int index) { return ((FieldInfo*)fields->adr_at(index * field_slots)); } static FieldInfo* from_field_array(u2* fields, int index) { return ((FieldInfo*)(fields + index * field_slots)); } void initialize(u2 access_flags, u2 name_index, u2 signature_index, u2 initval_index) { _shorts[access_flags_offset] = access_flags; _shorts[name_index_offset] = name_index; _shorts[signature_index_offset] = signature_index; _shorts[initval_index_offset] = initval_index; _shorts[low_packed_offset] = 0; _shorts[high_packed_offset] = 0; } u2 access_flags() const { return _shorts[access_flags_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: fatal("Asking offset for the plain type field"); case FIELDINFO_TAG_TYPE_CONTENDED: fatal("Asking offset for the contended type field"); case FIELDINFO_TAG_BLANK: fatal("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: fatal("Asking contended flag for the field with offset"); case FIELDINFO_TAG_BLANK: fatal("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: fatal("Asking the contended group for the field with offset"); case FIELDINFO_TAG_BLANK: fatal("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: fatal("Asking the field type for field with offset"); case FIELDINFO_TAG_BLANK: fatal("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 { int index = name_index(); if (is_internal()) { return lookup_symbol(index); } return cp->symbol_at(index); } Symbol* signature(constantPoolHandle cp) const { int index = signature_index(); if (is_internal()) { return lookup_symbol(index); } return cp->symbol_at(index); } void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } void set_offset(u4 val) { val = val << FIELDINFO_TAG_SIZE; // make room for tag _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: fatal("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: fatal("Overwriting contended group"); case FIELDINFO_TAG_BLANK: fatal("Setting contended group for the blank field"); case FIELDINFO_TAG_OFFSET: fatal("Setting contended group for field with offset"); #endif } ShouldNotReachHere(); } bool is_internal() const { return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; } bool is_stable() const { return (access_flags() & JVM_ACC_FIELD_STABLE) != 0; } void set_stable(bool z) { if (z) _shorts[access_flags_offset] |= JVM_ACC_FIELD_STABLE; else _shorts[access_flags_offset] &= ~JVM_ACC_FIELD_STABLE; } Symbol* lookup_symbol(int symbol_index) const { assert(is_internal(), "only internal fields"); return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); } }; #endif // SHARE_VM_OOPS_FIELDINFO_HPP