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src/share/vm/ci/ciField.hpp@4ce7240d622c (annotated)

src/share/vm/ci/ciField.hpp

Wed, 06 Jan 2010 14:22:39 -0800

author

never

date

Wed, 06 Jan 2010 14:22:39 -0800

changeset 1577

4ce7240d622c

parent 1573

dd57230ba8fe

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6914300: ciEnv should export all well known classes
Reviewed-by: kvn, twisti

duke@435	1	/*
xdono@631	2	* Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// ciField
duke@435	26	//
duke@435	27	// This class represents the result of a field lookup in the VM.
duke@435	28	// The lookup may not succeed, in which case the information in
duke@435	29	// the ciField will be incomplete.
duke@435	30	class ciField : public ResourceObj {
duke@435	31	CI_PACKAGE_ACCESS
duke@435	32	friend class ciEnv;
duke@435	33	friend class ciInstanceKlass;
duke@435	34	friend class NonStaticFieldFiller;
duke@435	35
duke@435	36	private:
duke@435	37	ciFlags _flags;
duke@435	38	ciInstanceKlass* _holder;
duke@435	39	ciSymbol* _name;
duke@435	40	ciSymbol* _signature;
duke@435	41	ciType* _type;
duke@435	42	int _offset;
duke@435	43	bool _is_constant;
duke@435	44	ciInstanceKlass* _known_to_link_with;
duke@435	45	ciConstant _constant_value;
duke@435	46
duke@435	47	// Used for will_link
duke@435	48	int _cp_index;
duke@435	49
duke@435	50	ciType* compute_type();
duke@435	51	ciType* compute_type_impl();
duke@435	52
duke@435	53	ciField(ciInstanceKlass* klass, int index);
duke@435	54	ciField(fieldDescriptor* fd);
duke@435	55
duke@435	56	// shared constructor code
duke@435	57	void initialize_from(fieldDescriptor* fd);
duke@435	58
duke@435	59	// The implementation of the print method.
duke@435	60	void print_impl(outputStream* st);
duke@435	61
duke@435	62	public:
duke@435	63	ciFlags flags() { return _flags; }
duke@435	64
duke@435	65	// Of which klass is this field a member?
duke@435	66	//
duke@435	67	// Usage note: the declared holder of a field is the class
duke@435	68	// referenced by name in the bytecodes. The canonical holder
duke@435	69	// is the most general class which holds the field. This
duke@435	70	// method returns the canonical holder. The declared holder
duke@435	71	// can be accessed via a method in ciBytecodeStream.
duke@435	72	//
duke@435	73	// Ex.
duke@435	74	// class A {
duke@435	75	// public int f = 7;
duke@435	76	// }
duke@435	77	// class B extends A {
duke@435	78	// public void test() {
duke@435	79	// System.out.println(f);
duke@435	80	// }
duke@435	81	// }
duke@435	82	//
duke@435	83	// A java compiler is permitted to compile the access to
duke@435	84	// field f as:
duke@435	85	//
duke@435	86	// getfield B.f
duke@435	87	//
duke@435	88	// In that case the declared holder of f would be B and
duke@435	89	// the canonical holder of f would be A.
duke@435	90	ciInstanceKlass* holder() { return _holder; }
duke@435	91
duke@435	92	// Name of this field?
duke@435	93	ciSymbol* name() { return _name; }
duke@435	94
duke@435	95	// Signature of this field?
duke@435	96	ciSymbol* signature() { return _signature; }
duke@435	97
duke@435	98	// Of what type is this field?
duke@435	99	ciType* type() { return (_type == NULL) ? compute_type() : _type; }
duke@435	100
duke@435	101	// How is this field actually stored in memory?
duke@435	102	BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; }
duke@435	103
duke@435	104	// How big is this field in memory?
kvn@464	105	int size_in_bytes() { return type2aelembytes(layout_type()); }
duke@435	106
duke@435	107	// What is the offset of this field?
duke@435	108	int offset() {
duke@435	109	assert(_offset >= 1, "illegal call to offset()");
duke@435	110	return _offset;
duke@435	111	}
duke@435	112
duke@435	113	// Same question, explicit units. (Fields are aligned to the byte level.)
duke@435	114	int offset_in_bytes() {
duke@435	115	return offset();
duke@435	116	}
duke@435	117
duke@435	118	// Is this field shared?
duke@435	119	bool is_shared() {
duke@435	120	// non-static fields of shared holders are cached
duke@435	121	return _holder->is_shared() && !is_static();
duke@435	122	}
duke@435	123
duke@435	124	// Is this field a constant?
duke@435	125	//
duke@435	126	// Clarification: A field is considered constant if:
duke@435	127	// 1. The field is both static and final
duke@435	128	// 2. The canonical holder of the field has undergone
duke@435	129	// static initialization.
duke@435	130	// 3. If the field is an object or array, then the oop
duke@435	131	// in question is allocated in perm space.
duke@435	132	// 4. The field is not one of the special static/final
duke@435	133	// non-constant fields. These are java.lang.System.in
duke@435	134	// and java.lang.System.out. Abomination.
duke@435	135	//
duke@435	136	// Note: the check for case 4 is not yet implemented.
duke@435	137	bool is_constant() { return _is_constant; }
duke@435	138
duke@435	139	// Get the constant value of this field.
duke@435	140	ciConstant constant_value() {
twisti@1573	141	assert(is_static() && is_constant(), "illegal call to constant_value()");
duke@435	142	return _constant_value;
duke@435	143	}
duke@435	144
twisti@1573	145	// Get the constant value of non-static final field in the given
twisti@1573	146	// object.
twisti@1573	147	ciConstant constant_value_of(ciObject* object) {
twisti@1573	148	assert(!is_static() && is_constant(), "only if field is non-static constant");
twisti@1573	149	assert(object->is_instance(), "must be instance");
twisti@1573	150	return object->as_instance()->field_value(this);
twisti@1573	151	}
twisti@1573	152
duke@435	153	// Check for link time errors. Accessing a field from a
duke@435	154	// certain class via a certain bytecode may or may not be legal.
duke@435	155	// This call checks to see if an exception may be raised by
duke@435	156	// an access of this field.
duke@435	157	//
duke@435	158	// Usage note: if the same field is accessed multiple times
duke@435	159	// in the same compilation, will_link will need to be checked
duke@435	160	// at each point of access.
duke@435	161	bool will_link(ciInstanceKlass* accessing_klass,
duke@435	162	Bytecodes::Code bc);
duke@435	163
duke@435	164	// Java access flags
duke@435	165	bool is_public () { return flags().is_public(); }
duke@435	166	bool is_private () { return flags().is_private(); }
duke@435	167	bool is_protected () { return flags().is_protected(); }
duke@435	168	bool is_static () { return flags().is_static(); }
duke@435	169	bool is_final () { return flags().is_final(); }
duke@435	170	bool is_volatile () { return flags().is_volatile(); }
duke@435	171	bool is_transient () { return flags().is_transient(); }
duke@435	172
duke@435	173	// Debugging output
duke@435	174	void print();
duke@435	175	void print_name_on(outputStream* st);
duke@435	176	};