Mercurial > hg > graal-compiler
diff src/share/vm/oops/fieldInfo.hpp @ 3938:e6b1331a51d2
7086585: make Java field injection more flexible
Reviewed-by: jrose, twisti, kvn, coleenp
author | never |
---|---|
date | Sat, 10 Sep 2011 17:29:02 -0700 |
parents | |
children | 71afdabfd05b |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/fieldInfo.hpp Sat Sep 10 17:29:02 2011 -0700 @@ -0,0 +1,132 @@ +/* + * Copyright (c) 2011, 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/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 7 shorts + enum FieldOffset { + access_flags_offset = 0, + name_index_offset = 1, + signature_index_offset = 2, + initval_index_offset = 3, + low_offset = 4, + high_offset = 5, + generic_signature_offset = 6, + field_slots = 7 + }; + + 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; } + void set_generic_signature_index(u2 val) { _shorts[generic_signature_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]; } + u2 generic_signature_index() const { return _shorts[generic_signature_offset]; } + + public: + static FieldInfo* from_field_array(typeArrayOop fields, int index) { + return ((FieldInfo*)fields->short_at_addr(index * field_slots)); + } + + void initialize(u2 access_flags, + u2 name_index, + u2 signature_index, + u2 initval_index, + u2 generic_signature_index, + u4 offset) { + _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[generic_signature_offset] = generic_signature_index; + set_offset(offset); + } + + u2 access_flags() const { return _shorts[access_flags_offset]; } + u4 offset() const { return build_int_from_shorts(_shorts[low_offset], _shorts[high_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); + } + + Symbol* generic_signature(constantPoolHandle cp) const { + int index = generic_signature_index(); + if (index == 0) { + return NULL; + } + return cp->symbol_at(index); + } + + void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } + void set_offset(u4 val) { + _shorts[low_offset] = extract_low_short_from_int(val); + _shorts[high_offset] = extract_high_short_from_int(val); + } + + bool is_internal() const { + return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; + } + + 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