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src/share/vm/ci/ciType.hpp@b4776199210f (annotated)

src/share/vm/ci/ciType.hpp

Mon, 26 Apr 2010 23:59:45 -0700

author

never

date

Mon, 26 Apr 2010 23:59:45 -0700

changeset 1832

b4776199210f

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6943485: JVMTI always on capabilities change code generation too much
Reviewed-by: twisti, dcubed

duke@435	1	/*
duke@435	2	* Copyright 2000-2001 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	// ciType
duke@435	26	//
duke@435	27	// This class represents either a class (T_OBJECT), array (T_ARRAY),
duke@435	28	// or one of the primitive types such as T_INT.
duke@435	29	class ciType : public ciObject {
duke@435	30	CI_PACKAGE_ACCESS
duke@435	31	friend class ciKlass;
duke@435	32	friend class ciReturnAddress;
duke@435	33
duke@435	34	private:
duke@435	35	BasicType _basic_type;
duke@435	36
duke@435	37	ciType(BasicType t); // for the primitive types only
duke@435	38	ciType(KlassHandle k); // for subclasses (reference types)
duke@435	39	ciType(ciKlass* klass); // for unloaded types
duke@435	40
duke@435	41	const char* type_string() { return "ciType"; }
duke@435	42
duke@435	43	void print_impl(outputStream* st);
duke@435	44
duke@435	45	// Distinguished instances of primitive ciTypes..
duke@435	46	static ciType* _basic_types[T_CONFLICT+1];
duke@435	47
duke@435	48	public:
duke@435	49	BasicType basic_type() const { return _basic_type; }
duke@435	50
duke@435	51	// Returns true iff the types are identical, or if both are klasses
duke@435	52	// and the is_subtype_of relation holds between the klasses.
duke@435	53	bool is_subtype_of(ciType* type);
duke@435	54
duke@435	55	// Get the instance of java.lang.Class corresponding to this type.
duke@435	56	// There are mirrors for instance, array, and primitive types (incl. void).
duke@435	57	virtual ciInstance* java_mirror();
duke@435	58
duke@435	59	// Get the class which "boxes" (or "wraps") values of this type.
duke@435	60	// Example: short is boxed by java.lang.Short, etc.
duke@435	61	// Returns self if it is a reference type.
duke@435	62	// Returns NULL for void, since null is used in such cases.
duke@435	63	ciKlass* box_klass();
duke@435	64
duke@435	65	// Returns true if this is not a klass or array (i.e., not a reference type).
duke@435	66	bool is_primitive_type() const { return basic_type() != T_OBJECT && basic_type() != T_ARRAY; }
duke@435	67	int size() const { return type2size[basic_type()]; }
duke@435	68	bool is_void() const { return basic_type() == T_VOID; }
duke@435	69	bool is_one_word() const { return size() == 1; }
duke@435	70	bool is_two_word() const { return size() == 2; }
duke@435	71
duke@435	72	// What kind of ciObject is this?
duke@435	73	bool is_type() { return true; }
duke@435	74	bool is_classless() const { return is_primitive_type(); }
duke@435	75
duke@435	76	virtual void print_name_on(outputStream* st);
duke@435	77	void print_name() {
duke@435	78	print_name_on(tty);
duke@435	79	}
duke@435	80
duke@435	81	static ciType* make(BasicType t);
duke@435	82	};
duke@435	83
duke@435	84
duke@435	85	// ciReturnAddress
duke@435	86	//
duke@435	87	// This class represents the type of a specific return address in the
duke@435	88	// bytecodes.
duke@435	89	class ciReturnAddress : public ciType {
duke@435	90	CI_PACKAGE_ACCESS
duke@435	91
duke@435	92	private:
duke@435	93	// The bci of this return address.
duke@435	94	int _bci;
duke@435	95
duke@435	96	ciReturnAddress(int bci);
duke@435	97
duke@435	98	const char* type_string() { return "ciReturnAddress"; }
duke@435	99
duke@435	100	void print_impl(outputStream* st);
duke@435	101
duke@435	102	public:
duke@435	103	bool is_return_address() { return true; }
duke@435	104
duke@435	105	int bci() { return _bci; }
duke@435	106
duke@435	107	static ciReturnAddress* make(int bci);
duke@435	108	};