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src/share/vm/ci/ciInstance.cpp@b4776199210f (annotated)

src/share/vm/ci/ciInstance.cpp

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

author

never

date

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

changeset 1832

b4776199210f

parent 1577

4ce7240d622c

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 1999-2005 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	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_ciInstance.cpp.incl"
duke@435	27
duke@435	28	// ciInstance
duke@435	29	//
duke@435	30	// This class represents an instanceOop in the HotSpot virtual
duke@435	31	// machine.
duke@435	32
duke@435	33	// ------------------------------------------------------------------
duke@435	34	// ciObject::java_mirror_type
duke@435	35	ciType* ciInstance::java_mirror_type() {
duke@435	36	VM_ENTRY_MARK;
duke@435	37	oop m = get_oop();
duke@435	38	// Return NULL if it is not java.lang.Class.
never@1577	39	if (m == NULL || m->klass() != SystemDictionary::Class_klass()) {
duke@435	40	return NULL;
duke@435	41	}
duke@435	42	// Return either a primitive type or a klass.
duke@435	43	if (java_lang_Class::is_primitive(m)) {
duke@435	44	return ciType::make(java_lang_Class::primitive_type(m));
duke@435	45	} else {
duke@435	46	klassOop k = java_lang_Class::as_klassOop(m);
duke@435	47	assert(k != NULL, "");
duke@435	48	return CURRENT_THREAD_ENV->get_object(k)->as_klass();
duke@435	49	}
duke@435	50	}
duke@435	51
duke@435	52	// ------------------------------------------------------------------
duke@435	53	// ciInstance::field_value
duke@435	54	//
duke@435	55	// Constant value of a field.
duke@435	56	ciConstant ciInstance::field_value(ciField* field) {
duke@435	57	assert(is_loaded() &&
duke@435	58	field->holder()->is_loaded() &&
duke@435	59	klass()->is_subclass_of(field->holder()),
duke@435	60	"invalid access");
duke@435	61	VM_ENTRY_MARK;
duke@435	62	ciConstant result;
duke@435	63	oop obj = get_oop();
duke@435	64	assert(obj != NULL, "bad oop");
duke@435	65	BasicType field_btype = field->type()->basic_type();
duke@435	66	int offset = field->offset();
duke@435	67
duke@435	68	switch(field_btype) {
duke@435	69	case T_BYTE:
duke@435	70	return ciConstant(field_btype, obj->byte_field(offset));
duke@435	71	break;
duke@435	72	case T_CHAR:
duke@435	73	return ciConstant(field_btype, obj->char_field(offset));
duke@435	74	break;
duke@435	75	case T_SHORT:
duke@435	76	return ciConstant(field_btype, obj->short_field(offset));
duke@435	77	break;
duke@435	78	case T_BOOLEAN:
duke@435	79	return ciConstant(field_btype, obj->bool_field(offset));
duke@435	80	break;
duke@435	81	case T_INT:
duke@435	82	return ciConstant(field_btype, obj->int_field(offset));
duke@435	83	break;
duke@435	84	case T_FLOAT:
duke@435	85	return ciConstant(obj->float_field(offset));
duke@435	86	break;
duke@435	87	case T_DOUBLE:
duke@435	88	return ciConstant(obj->double_field(offset));
duke@435	89	break;
duke@435	90	case T_LONG:
duke@435	91	return ciConstant(obj->long_field(offset));
duke@435	92	break;
duke@435	93	case T_OBJECT:
duke@435	94	case T_ARRAY:
duke@435	95	{
duke@435	96	oop o = obj->obj_field(offset);
duke@435	97
duke@435	98	// A field will be "constant" if it is known always to be
duke@435	99	// a non-null reference to an instance of a particular class,
duke@435	100	// or to a particular array. This can happen even if the instance
duke@435	101	// or array is not perm. In such a case, an "unloaded" ciArray
duke@435	102	// or ciInstance is created. The compiler may be able to use
duke@435	103	// information about the object's class (which is exact) or length.
duke@435	104
duke@435	105	if (o == NULL) {
duke@435	106	return ciConstant(field_btype, ciNullObject::make());
duke@435	107	} else {
duke@435	108	return ciConstant(field_btype, CURRENT_ENV->get_object(o));
duke@435	109	}
duke@435	110	}
duke@435	111	}
duke@435	112	ShouldNotReachHere();
duke@435	113	// to shut up the compiler
duke@435	114	return ciConstant();
duke@435	115	}
duke@435	116
duke@435	117	// ------------------------------------------------------------------
duke@435	118	// ciInstance::field_value_by_offset
duke@435	119	//
duke@435	120	// Constant value of a field at the specified offset.
duke@435	121	ciConstant ciInstance::field_value_by_offset(int field_offset) {
duke@435	122	ciInstanceKlass* ik = klass()->as_instance_klass();
duke@435	123	ciField* field = ik->get_field_by_offset(field_offset, false);
duke@435	124	return field_value(field);
duke@435	125	}
duke@435	126
duke@435	127	// ------------------------------------------------------------------
duke@435	128	// ciInstance::print_impl
duke@435	129	//
duke@435	130	// Implementation of the print method.
duke@435	131	void ciInstance::print_impl(outputStream* st) {
duke@435	132	st->print(" type=");
duke@435	133	klass()->print(st);
duke@435	134	}