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src/share/vm/classfile/verificationType.cpp@ac27a9c85bea (annotated)

src/share/vm/classfile/verificationType.cpp

Thu, 24 May 2018 18:41:44 +0800

author

aoqi

date

Thu, 24 May 2018 18:41:44 +0800

changeset 8856

ac27a9c85bea

parent 8604

04d83ba48607

child 9122

024be04bb151

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
iklam@8497	2	* Copyright (c) 2003, 2016, 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"
iklam@8497	27	#include "classfile/systemDictionaryShared.hpp"
aoqi@0	28	#include "classfile/verificationType.hpp"
aoqi@0	29	#include "classfile/verifier.hpp"
aoqi@0	30
aoqi@0	31	VerificationType VerificationType::from_tag(u1 tag) {
aoqi@0	32	switch (tag) {
aoqi@0	33	case ITEM_Top: return bogus_type();
aoqi@0	34	case ITEM_Integer: return integer_type();
aoqi@0	35	case ITEM_Float: return float_type();
aoqi@0	36	case ITEM_Double: return double_type();
aoqi@0	37	case ITEM_Long: return long_type();
aoqi@0	38	case ITEM_Null: return null_type();
aoqi@0	39	default:
aoqi@0	40	ShouldNotReachHere();
aoqi@0	41	return bogus_type();
aoqi@0	42	}
aoqi@0	43	}
aoqi@0	44
aoqi@0	45	bool VerificationType::is_reference_assignable_from(
aoqi@0	46	const VerificationType& from, ClassVerifier* context,
aoqi@0	47	bool from_field_is_protected, TRAPS) const {
aoqi@0	48	instanceKlassHandle klass = context->current_class();
aoqi@0	49	if (from.is_null()) {
aoqi@0	50	// null is assignable to any reference
aoqi@0	51	return true;
aoqi@0	52	} else if (is_null()) {
aoqi@0	53	return false;
aoqi@0	54	} else if (name() == from.name()) {
aoqi@0	55	return true;
aoqi@0	56	} else if (is_object()) {
aoqi@0	57	// We need check the class hierarchy to check assignability
aoqi@0	58	if (name() == vmSymbols::java_lang_Object()) {
aoqi@0	59	// any object or array is assignable to java.lang.Object
aoqi@0	60	return true;
aoqi@0	61	}
aoqi@0	62	Klass* obj = SystemDictionary::resolve_or_fail(
aoqi@0	63	name(), Handle(THREAD, klass->class_loader()),
aoqi@0	64	Handle(THREAD, klass->protection_domain()), true, CHECK_false);
aoqi@0	65	KlassHandle this_class(THREAD, obj);
aoqi@0	66
aoqi@0	67	if (this_class->is_interface() && (!from_field_is_protected ||
aoqi@0	68	from.name() != vmSymbols::java_lang_Object())) {
aoqi@0	69	// If we are not trying to access a protected field or method in
aoqi@0	70	// java.lang.Object then we treat interfaces as java.lang.Object,
aoqi@0	71	// including java.lang.Cloneable and java.io.Serializable.
aoqi@0	72	return true;
aoqi@0	73	} else if (from.is_object()) {
aoqi@0	74	Klass* from_class = SystemDictionary::resolve_or_fail(
aoqi@0	75	from.name(), Handle(THREAD, klass->class_loader()),
aoqi@0	76	Handle(THREAD, klass->protection_domain()), true, CHECK_false);
iklam@8497	77	bool result = InstanceKlass::cast(from_class)->is_subclass_of(this_class());
iklam@8497	78	if (result && DumpSharedSpaces) {
iklam@8497	79	if (klass()->is_subclass_of(from_class) && klass()->is_subclass_of(this_class())) {
iklam@8497	80	// No need to save verification dependency. At run time, <klass> will be
iklam@8497	81	// loaded from the archived only if <from_class> and <this_class> are
iklam@8497	82	// also loaded from the archive. I.e., all 3 classes are exactly the same
iklam@8497	83	// as we saw at archive creation time.
iklam@8497	84	} else {
iklam@8497	85	// Save the dependency. At run time, we need to check that the condition
iklam@8497	86	// from_class->is_subclass_of(this_class() is still true.
iklam@8497	87	Symbol* accessor_clsname = from.name();
iklam@8497	88	Symbol* target_clsname = this_class()->name();
iklam@8497	89	SystemDictionaryShared::add_verification_dependency(klass(),
iklam@8497	90	accessor_clsname, target_clsname);
iklam@8497	91	}
iklam@8497	92	}
iklam@8497	93	return result;
aoqi@0	94	}
aoqi@0	95	} else if (is_array() && from.is_array()) {
aoqi@0	96	VerificationType comp_this = get_component(context, CHECK_false);
aoqi@0	97	VerificationType comp_from = from.get_component(context, CHECK_false);
aoqi@0	98	if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
aoqi@0	99	return comp_this.is_assignable_from(comp_from, context,
aoqi@0	100	from_field_is_protected, CHECK_false);
aoqi@0	101	}
aoqi@0	102	}
aoqi@0	103	return false;
aoqi@0	104	}
aoqi@0	105
aoqi@0	106	VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const {
aoqi@0	107	assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
aoqi@0	108	Symbol* component;
aoqi@0	109	switch (name()->byte_at(1)) {
aoqi@0	110	case 'Z': return VerificationType(Boolean);
aoqi@0	111	case 'B': return VerificationType(Byte);
aoqi@0	112	case 'C': return VerificationType(Char);
aoqi@0	113	case 'S': return VerificationType(Short);
aoqi@0	114	case 'I': return VerificationType(Integer);
aoqi@0	115	case 'J': return VerificationType(Long);
aoqi@0	116	case 'F': return VerificationType(Float);
aoqi@0	117	case 'D': return VerificationType(Double);
aoqi@0	118	case '[':
aoqi@0	119	component = context->create_temporary_symbol(
aoqi@0	120	name(), 1, name()->utf8_length(),
aoqi@0	121	CHECK_(VerificationType::bogus_type()));
aoqi@0	122	return VerificationType::reference_type(component);
aoqi@0	123	case 'L':
aoqi@0	124	component = context->create_temporary_symbol(
aoqi@0	125	name(), 2, name()->utf8_length() - 1,
aoqi@0	126	CHECK_(VerificationType::bogus_type()));
aoqi@0	127	return VerificationType::reference_type(component);
aoqi@0	128	default:
aoqi@0	129	// Met an invalid type signature, e.g. [X
aoqi@0	130	return VerificationType::bogus_type();
aoqi@0	131	}
aoqi@0	132	}
aoqi@0	133
aoqi@0	134	void VerificationType::print_on(outputStream* st) const {
aoqi@0	135	switch (_u._data) {
aoqi@0	136	case Bogus: st->print("top"); break;
aoqi@0	137	case Category1: st->print("category1"); break;
aoqi@0	138	case Category2: st->print("category2"); break;
aoqi@0	139	case Category2_2nd: st->print("category2_2nd"); break;
aoqi@0	140	case Boolean: st->print("boolean"); break;
aoqi@0	141	case Byte: st->print("byte"); break;
aoqi@0	142	case Short: st->print("short"); break;
aoqi@0	143	case Char: st->print("char"); break;
aoqi@0	144	case Integer: st->print("integer"); break;
aoqi@0	145	case Float: st->print("float"); break;
aoqi@0	146	case Long: st->print("long"); break;
aoqi@0	147	case Double: st->print("double"); break;
aoqi@0	148	case Long_2nd: st->print("long_2nd"); break;
aoqi@0	149	case Double_2nd: st->print("double_2nd"); break;
aoqi@0	150	case Null: st->print("null"); break;
aoqi@0	151	case ReferenceQuery: st->print("reference type"); break;
aoqi@0	152	case Category1Query: st->print("category1 type"); break;
aoqi@0	153	case Category2Query: st->print("category2 type"); break;
aoqi@0	154	case Category2_2ndQuery: st->print("category2_2nd type"); break;
aoqi@0	155	default:
aoqi@0	156	if (is_uninitialized_this()) {
aoqi@0	157	st->print("uninitializedThis");
aoqi@0	158	} else if (is_uninitialized()) {
aoqi@0	159	st->print("uninitialized %d", bci());
aoqi@0	160	} else {
aoqi@0	161	name()->print_value_on(st);
aoqi@0	162	}
aoqi@0	163	}
aoqi@0	164	}