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src/share/vm/runtime/stackValue.hpp@c18cbe5936b8 (annotated)

src/share/vm/runtime/stackValue.hpp

Thu, 27 May 2010 19:08:38 -0700

author

trims

date

Thu, 27 May 2010 19:08:38 -0700

changeset 1907

c18cbe5936b8

parent 1279

bd02caa94611

child 2314

f95d63e2154a

permissions

-rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

duke@435	1	/*
trims@1907	2	* Copyright (c) 1997, 2009, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	class StackValue : public ResourceObj {
duke@435	26	private:
duke@435	27	BasicType _type;
duke@435	28	intptr_t _i; // Blank java stack slot value
duke@435	29	Handle _o; // Java stack slot value interpreted as a Handle
duke@435	30	public:
duke@435	31
duke@435	32	StackValue(intptr_t value) {
duke@435	33	_type = T_INT;
duke@435	34	_i = value;
duke@435	35	}
duke@435	36
kvn@1253	37	StackValue(Handle value, intptr_t scalar_replaced = 0) {
duke@435	38	_type = T_OBJECT;
kvn@1253	39	_i = scalar_replaced;
duke@435	40	_o = value;
kvn@1253	41	assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced");
duke@435	42	}
duke@435	43
duke@435	44	StackValue() {
duke@435	45	_type = T_CONFLICT;
duke@435	46	_i = 0;
duke@435	47	}
duke@435	48
duke@435	49	// Only used during deopt- preserve object type.
duke@435	50	StackValue(intptr_t o, BasicType t) {
duke@435	51	assert(t == T_OBJECT, "should not be used");
duke@435	52	_type = t;
duke@435	53	_i = o;
duke@435	54	}
duke@435	55
duke@435	56	Handle get_obj() const {
duke@435	57	assert(type() == T_OBJECT, "type check");
duke@435	58	return _o;
duke@435	59	}
duke@435	60
kvn@1253	61	bool obj_is_scalar_replaced() const {
kvn@1253	62	assert(type() == T_OBJECT, "type check");
kvn@1253	63	return _i != 0;
kvn@1253	64	}
kvn@1253	65
duke@435	66	void set_obj(Handle value) {
duke@435	67	assert(type() == T_OBJECT, "type check");
duke@435	68	_o = value;
duke@435	69	}
duke@435	70
duke@435	71	intptr_t get_int() const {
duke@435	72	assert(type() == T_INT, "type check");
duke@435	73	return _i;
duke@435	74	}
duke@435	75
duke@435	76	// For special case in deopt.
duke@435	77	intptr_t get_int(BasicType t) const {
duke@435	78	assert(t == T_OBJECT && type() == T_OBJECT, "type check");
duke@435	79	return _i;
duke@435	80	}
duke@435	81
duke@435	82	void set_int(intptr_t value) {
duke@435	83	assert(type() == T_INT, "type check");
duke@435	84	_i = value;
duke@435	85	}
duke@435	86
duke@435	87	BasicType type() const { return _type; }
duke@435	88
duke@435	89	bool equal(StackValue *value) {
duke@435	90	if (_type != value->_type) return false;
duke@435	91	if (_type == T_OBJECT)
duke@435	92	return (_o == value->_o);
duke@435	93	else {
duke@435	94	assert(_type == T_INT, "sanity check");
duke@435	95	// [phh] compare only low addressed portions of intptr_t slots
duke@435	96	return (*(int *)&_i == *(int *)&value->_i);
duke@435	97	}
duke@435	98	}
duke@435	99
duke@435	100	static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv);
duke@435	101	static BasicLock* resolve_monitor_lock(const frame* fr, Location location);
duke@435	102
duke@435	103	#ifndef PRODUCT
duke@435	104	public:
duke@435	105	// Printing
duke@435	106	void print_on(outputStream* st) const;
duke@435	107	#endif
duke@435	108	};