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src/share/vm/classfile/verificationType.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/classfile/verificationType.cpp

Thu, 12 Oct 2017 21:27:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 21:27:07 +0800

changeset 7535

7ae4e26cb1e0

parent 6876

710a3c8b516e

child 8604

04d83ba48607

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "classfile/symbolTable.hpp"
aoqi@0	27	#include "classfile/verificationType.hpp"
aoqi@0	28	#include "classfile/verifier.hpp"
aoqi@0	29
aoqi@0	30	VerificationType VerificationType::from_tag(u1 tag) {
aoqi@0	31	switch (tag) {
aoqi@0	32	case ITEM_Top: return bogus_type();
aoqi@0	33	case ITEM_Integer: return integer_type();
aoqi@0	34	case ITEM_Float: return float_type();
aoqi@0	35	case ITEM_Double: return double_type();
aoqi@0	36	case ITEM_Long: return long_type();
aoqi@0	37	case ITEM_Null: return null_type();
aoqi@0	38	default:
aoqi@0	39	ShouldNotReachHere();
aoqi@0	40	return bogus_type();
aoqi@0	41	}
aoqi@0	42	}
aoqi@0	43
aoqi@0	44	bool VerificationType::is_reference_assignable_from(
aoqi@0	45	const VerificationType& from, ClassVerifier* context,
aoqi@0	46	bool from_field_is_protected, TRAPS) const {
aoqi@0	47	instanceKlassHandle klass = context->current_class();
aoqi@0	48	if (from.is_null()) {
aoqi@0	49	// null is assignable to any reference
aoqi@0	50	return true;
aoqi@0	51	} else if (is_null()) {
aoqi@0	52	return false;
aoqi@0	53	} else if (name() == from.name()) {
aoqi@0	54	return true;
aoqi@0	55	} else if (is_object()) {
aoqi@0	56	// We need check the class hierarchy to check assignability
aoqi@0	57	if (name() == vmSymbols::java_lang_Object()) {
aoqi@0	58	// any object or array is assignable to java.lang.Object
aoqi@0	59	return true;
aoqi@0	60	}
aoqi@0	61	Klass* obj = SystemDictionary::resolve_or_fail(
aoqi@0	62	name(), Handle(THREAD, klass->class_loader()),
aoqi@0	63	Handle(THREAD, klass->protection_domain()), true, CHECK_false);
aoqi@0	64	KlassHandle this_class(THREAD, obj);
aoqi@0	65
aoqi@0	66	if (this_class->is_interface() && (!from_field_is_protected ||
aoqi@0	67	from.name() != vmSymbols::java_lang_Object())) {
aoqi@0	68	// If we are not trying to access a protected field or method in
aoqi@0	69	// java.lang.Object then we treat interfaces as java.lang.Object,
aoqi@0	70	// including java.lang.Cloneable and java.io.Serializable.
aoqi@0	71	return true;
aoqi@0	72	} else if (from.is_object()) {
aoqi@0	73	Klass* from_class = SystemDictionary::resolve_or_fail(
aoqi@0	74	from.name(), Handle(THREAD, klass->class_loader()),
aoqi@0	75	Handle(THREAD, klass->protection_domain()), true, CHECK_false);
aoqi@0	76	return InstanceKlass::cast(from_class)->is_subclass_of(this_class());
aoqi@0	77	}
aoqi@0	78	} else if (is_array() && from.is_array()) {
aoqi@0	79	VerificationType comp_this = get_component(context, CHECK_false);
aoqi@0	80	VerificationType comp_from = from.get_component(context, CHECK_false);
aoqi@0	81	if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
aoqi@0	82	return comp_this.is_assignable_from(comp_from, context,
aoqi@0	83	from_field_is_protected, CHECK_false);
aoqi@0	84	}
aoqi@0	85	}
aoqi@0	86	return false;
aoqi@0	87	}
aoqi@0	88
aoqi@0	89	VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const {
aoqi@0	90	assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
aoqi@0	91	Symbol* component;
aoqi@0	92	switch (name()->byte_at(1)) {
aoqi@0	93	case 'Z': return VerificationType(Boolean);
aoqi@0	94	case 'B': return VerificationType(Byte);
aoqi@0	95	case 'C': return VerificationType(Char);
aoqi@0	96	case 'S': return VerificationType(Short);
aoqi@0	97	case 'I': return VerificationType(Integer);
aoqi@0	98	case 'J': return VerificationType(Long);
aoqi@0	99	case 'F': return VerificationType(Float);
aoqi@0	100	case 'D': return VerificationType(Double);
aoqi@0	101	case '[':
aoqi@0	102	component = context->create_temporary_symbol(
aoqi@0	103	name(), 1, name()->utf8_length(),
aoqi@0	104	CHECK_(VerificationType::bogus_type()));
aoqi@0	105	return VerificationType::reference_type(component);
aoqi@0	106	case 'L':
aoqi@0	107	component = context->create_temporary_symbol(
aoqi@0	108	name(), 2, name()->utf8_length() - 1,
aoqi@0	109	CHECK_(VerificationType::bogus_type()));
aoqi@0	110	return VerificationType::reference_type(component);
aoqi@0	111	default:
aoqi@0	112	// Met an invalid type signature, e.g. [X
aoqi@0	113	return VerificationType::bogus_type();
aoqi@0	114	}
aoqi@0	115	}
aoqi@0	116
aoqi@0	117	void VerificationType::print_on(outputStream* st) const {
aoqi@0	118	switch (_u._data) {
aoqi@0	119	case Bogus: st->print("top"); break;
aoqi@0	120	case Category1: st->print("category1"); break;
aoqi@0	121	case Category2: st->print("category2"); break;
aoqi@0	122	case Category2_2nd: st->print("category2_2nd"); break;
aoqi@0	123	case Boolean: st->print("boolean"); break;
aoqi@0	124	case Byte: st->print("byte"); break;
aoqi@0	125	case Short: st->print("short"); break;
aoqi@0	126	case Char: st->print("char"); break;
aoqi@0	127	case Integer: st->print("integer"); break;
aoqi@0	128	case Float: st->print("float"); break;
aoqi@0	129	case Long: st->print("long"); break;
aoqi@0	130	case Double: st->print("double"); break;
aoqi@0	131	case Long_2nd: st->print("long_2nd"); break;
aoqi@0	132	case Double_2nd: st->print("double_2nd"); break;
aoqi@0	133	case Null: st->print("null"); break;
aoqi@0	134	case ReferenceQuery: st->print("reference type"); break;
aoqi@0	135	case Category1Query: st->print("category1 type"); break;
aoqi@0	136	case Category2Query: st->print("category2 type"); break;
aoqi@0	137	case Category2_2ndQuery: st->print("category2_2nd type"); break;
aoqi@0	138	default:
aoqi@0	139	if (is_uninitialized_this()) {
aoqi@0	140	st->print("uninitializedThis");
aoqi@0	141	} else if (is_uninitialized()) {
aoqi@0	142	st->print("uninitialized %d", bci());
aoqi@0	143	} else {
aoqi@0	144	name()->print_value_on(st);
aoqi@0	145	}
aoqi@0	146	}
aoqi@0	147	}