author | vlivanov |
Mon, 11 Apr 2016 21:42:55 +0300 | |
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parent 36077 | fa6d92de1c70 |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "ci/ciField.hpp" |
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#include "ci/ciInstanceKlass.hpp" |
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#include "ci/ciUtilities.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "gc/shared/collectedHeap.inline.hpp" |
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#include "interpreter/linkResolver.hpp" |
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#include "memory/universe.inline.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/fieldDescriptor.hpp" |
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// ciField |
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// |
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// This class represents the result of a field lookup in the VM. |
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// The lookup may not succeed, in which case the information in |
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// the ciField will be incomplete. |
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// The ciObjectFactory cannot create circular data structures in one query. |
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// To avoid vicious circularities, we initialize ciField::_type to NULL |
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// for reference types and derive it lazily from the ciField::_signature. |
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// Primitive types are eagerly initialized, and basic layout queries |
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// can succeed without initialization, using only the BasicType of the field. |
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// Notes on bootstrapping and shared CI objects: A field is shared if and |
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// only if it is (a) non-static and (b) declared by a shared instance klass. |
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// This allows non-static field lists to be cached on shared types. |
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// Because the _type field is lazily initialized, however, there is a |
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// special restriction that a shared field cannot cache an unshared type. |
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// This puts a small performance penalty on shared fields with unshared |
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// types, such as StackTraceElement[] Throwable.stackTrace. |
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// (Throwable is shared because ClassCastException is shared, but |
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// StackTraceElement is not presently shared.) |
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// It is not a vicious circularity for a ciField to recursively create |
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// the ciSymbols necessary to represent its name and signature. |
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// Therefore, these items are created eagerly, and the name and signature |
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// of a shared field are themselves shared symbols. This somewhat |
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// pollutes the set of shared CI objects: It grows from 50 to 93 items, |
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// with all of the additional 43 being uninteresting shared ciSymbols. |
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// This adds at most one step to the binary search, an amount which |
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// decreases for complex compilation tasks. |
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// ------------------------------------------------------------------ |
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// ciField::ciField |
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ciField::ciField(ciInstanceKlass* klass, int index): _known_to_link_with_put(NULL), _known_to_link_with_get(NULL) { |
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ASSERT_IN_VM; |
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CompilerThread *thread = CompilerThread::current(); |
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assert(ciObjectFactory::is_initialized(), "not a shared field"); |
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assert(klass->get_instanceKlass()->is_linked(), "must be linked before using its constant-pool"); |
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constantPoolHandle cpool(thread, klass->get_instanceKlass()->constants()); |
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// Get the field's name, signature, and type. |
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Symbol* name = cpool->name_ref_at(index); |
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_name = ciEnv::current(thread)->get_symbol(name); |
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int nt_index = cpool->name_and_type_ref_index_at(index); |
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int sig_index = cpool->signature_ref_index_at(nt_index); |
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Symbol* signature = cpool->symbol_at(sig_index); |
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_signature = ciEnv::current(thread)->get_symbol(signature); |
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BasicType field_type = FieldType::basic_type(signature); |
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// If the field is a pointer type, get the klass of the |
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// field. |
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if (field_type == T_OBJECT || field_type == T_ARRAY) { |
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bool ignore; |
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// This is not really a class reference; the index always refers to the |
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// field's type signature, as a symbol. Linkage checks do not apply. |
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_type = ciEnv::current(thread)->get_klass_by_index(cpool, sig_index, ignore, klass); |
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} else { |
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_type = ciType::make(field_type); |
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} |
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_name = (ciSymbol*)ciEnv::current(thread)->get_symbol(name); |
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// Get the field's declared holder. |
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// |
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// Note: we actually create a ciInstanceKlass for this klass, |
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// even though we may not need to. |
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int holder_index = cpool->klass_ref_index_at(index); |
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bool holder_is_accessible; |
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ciKlass* generic_declared_holder = ciEnv::current(thread)->get_klass_by_index(cpool, holder_index, |
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holder_is_accessible, |
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klass); |
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if (generic_declared_holder->is_array_klass()) { |
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// If the declared holder of the field is an array class, assume that |
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// the canonical holder of that field is java.lang.Object. Arrays |
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// do not have fields; java.lang.Object is the only supertype of an |
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// array type that can declare fields and is therefore the canonical |
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// holder of the array type. |
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// |
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// Furthermore, the compilers assume that java.lang.Object does not |
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// have any fields. Therefore, the field is not looked up. Instead, |
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// the method returns partial information that will trigger special |
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// handling in ciField::will_link and will result in a |
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// java.lang.NoSuchFieldError exception being thrown by the compiled |
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// code (the expected behavior in this case). |
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_holder = ciEnv::current(thread)->Object_klass(); |
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_offset = -1; |
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_is_constant = false; |
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return; |
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} |
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ciInstanceKlass* declared_holder = generic_declared_holder->as_instance_klass(); |
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// The declared holder of this field may not have been loaded. |
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// Bail out with partial field information. |
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if (!holder_is_accessible) { |
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// _type has already been set. |
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// The default values for _flags and _constant_value will suffice. |
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// We need values for _holder, _offset, and _is_constant, |
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_holder = declared_holder; |
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_offset = -1; |
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_is_constant = false; |
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return; |
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} |
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InstanceKlass* loaded_decl_holder = declared_holder->get_instanceKlass(); |
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// Perform the field lookup. |
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fieldDescriptor field_desc; |
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Klass* canonical_holder = |
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loaded_decl_holder->find_field(name, signature, &field_desc); |
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if (canonical_holder == NULL) { |
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// Field lookup failed. Will be detected by will_link. |
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_holder = declared_holder; |
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_offset = -1; |
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_is_constant = false; |
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return; |
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} |
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// Access check based on declared_holder. canonical_holder should not be used |
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// to check access because it can erroneously succeed. If this check fails, |
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// propagate the declared holder to will_link() which in turn will bail out |
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// compilation for this field access. |
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if (!Reflection::verify_field_access(klass->get_Klass(), declared_holder->get_Klass(), canonical_holder, field_desc.access_flags(), true)) { |
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_holder = declared_holder; |
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_offset = -1; |
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_is_constant = false; |
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return; |
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} |
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assert(canonical_holder == field_desc.field_holder(), "just checking"); |
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initialize_from(&field_desc); |
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} |
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ciField::ciField(fieldDescriptor *fd): _known_to_link_with_put(NULL), _known_to_link_with_get(NULL) { |
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ASSERT_IN_VM; |
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// Get the field's name, signature, and type. |
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ciEnv* env = CURRENT_ENV; |
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_name = env->get_symbol(fd->name()); |
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_signature = env->get_symbol(fd->signature()); |
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BasicType field_type = fd->field_type(); |
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// If the field is a pointer type, get the klass of the |
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// field. |
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if (field_type == T_OBJECT || field_type == T_ARRAY) { |
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_type = NULL; // must call compute_type on first access |
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} else { |
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_type = ciType::make(field_type); |
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} |
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initialize_from(fd); |
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// Either (a) it is marked shared, or else (b) we are done bootstrapping. |
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assert(is_shared() || ciObjectFactory::is_initialized(), |
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"bootstrap classes must not create & cache unshared fields"); |
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} |
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static bool trust_final_non_static_fields(ciInstanceKlass* holder) { |
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if (holder == NULL) |
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return false; |
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if (holder->name() == ciSymbol::java_lang_System()) |
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// Never trust strangely unstable finals: System.out, etc. |
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return false; |
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// Even if general trusting is disabled, trust system-built closures in these packages. |
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if (holder->is_in_package("java/lang/invoke") || holder->is_in_package("sun/invoke")) |
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return true; |
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// Trust VM anonymous classes. They are private API (sun.misc.Unsafe) and can't be serialized, |
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// so there is no hacking of finals going on with them. |
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if (holder->is_anonymous()) |
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return true; |
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// Trust final fields in all boxed classes |
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if (holder->is_box_klass()) |
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return true; |
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// Trust final fields in String |
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if (holder->name() == ciSymbol::java_lang_String()) |
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return true; |
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// Trust Atomic*FieldUpdaters: they are very important for performance, and make up one |
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// more reason not to use Unsafe, if their final fields are trusted. See more in JDK-8140483. |
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if (holder->name() == ciSymbol::java_util_concurrent_atomic_AtomicIntegerFieldUpdater_Impl() || |
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holder->name() == ciSymbol::java_util_concurrent_atomic_AtomicLongFieldUpdater_CASUpdater() || |
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holder->name() == ciSymbol::java_util_concurrent_atomic_AtomicLongFieldUpdater_LockedUpdater() || |
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holder->name() == ciSymbol::java_util_concurrent_atomic_AtomicReferenceFieldUpdater_Impl()) { |
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return true; |
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} |
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return TrustFinalNonStaticFields; |
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} |
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230 |
|
1 | 231 |
void ciField::initialize_from(fieldDescriptor* fd) { |
232 |
// Get the flags, offset, and canonical holder of the field. |
|
233 |
_flags = ciFlags(fd->access_flags()); |
|
234 |
_offset = fd->offset(); |
|
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_holder = CURRENT_ENV->get_instance_klass(fd->field_holder()); |
1 | 236 |
|
237 |
// Check to see if the field is constant. |
|
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Klass* k = _holder->get_Klass(); |
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bool is_stable_field = FoldStableValues && is_stable(); |
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if (is_final() || is_stable_field) { |
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if (is_static()) { |
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// This field just may be constant. The only case where it will |
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243 |
// not be constant is when the field is a *special* static & final field |
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// whose value may change. The three examples are java.lang.System.in, |
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245 |
// java.lang.System.out, and java.lang.System.err. |
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246 |
assert(SystemDictionary::System_klass() != NULL, "Check once per vm"); |
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if (k == SystemDictionary::System_klass()) { |
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248 |
// Check offsets for case 2: System.in, System.out, or System.err |
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if( _offset == java_lang_System::in_offset_in_bytes() || |
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250 |
_offset == java_lang_System::out_offset_in_bytes() || |
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251 |
_offset == java_lang_System::err_offset_in_bytes() ) { |
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252 |
_is_constant = false; |
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253 |
return; |
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254 |
} |
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255 |
} |
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256 |
_is_constant = true; |
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257 |
} else { |
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258 |
// An instance field can be constant if it's a final static field or if |
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// it's a final non-static field of a trusted class (classes in |
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260 |
// java.lang.invoke and sun.invoke packages and subpackages). |
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_is_constant = is_stable_field || trust_final_non_static_fields(_holder); |
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} |
1 | 263 |
} else { |
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264 |
// For CallSite objects treat the target field as a compile time constant. |
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assert(SystemDictionary::CallSite_klass() != NULL, "should be already initialized"); |
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266 |
if (k == SystemDictionary::CallSite_klass() && |
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267 |
_offset == java_lang_invoke_CallSite::target_offset_in_bytes()) { |
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268 |
_is_constant = true; |
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269 |
} else { |
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// Non-final & non-stable fields are not constants. |
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_is_constant = false; |
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272 |
} |
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273 |
} |
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274 |
} |
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|
275 |
|
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276 |
// ------------------------------------------------------------------ |
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277 |
// ciField::constant_value |
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278 |
// Get the constant value of a this static field. |
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279 |
ciConstant ciField::constant_value() { |
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280 |
assert(is_static() && is_constant(), "illegal call to constant_value()"); |
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281 |
if (!_holder->is_initialized()) { |
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282 |
return ciConstant(); // Not initialized yet |
1 | 283 |
} |
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284 |
if (_constant_value.basic_type() == T_ILLEGAL) { |
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285 |
// Static fields are placed in mirror objects. |
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|
286 |
VM_ENTRY_MARK; |
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|
287 |
ciInstance* mirror = CURRENT_ENV->get_instance(_holder->get_Klass()->java_mirror()); |
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288 |
_constant_value = mirror->field_value_impl(type()->basic_type(), offset()); |
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|
289 |
} |
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290 |
if (FoldStableValues && is_stable() && _constant_value.is_null_or_zero()) { |
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291 |
return ciConstant(); |
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|
292 |
} |
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|
293 |
return _constant_value; |
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|
294 |
} |
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|
295 |
|
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|
296 |
// ------------------------------------------------------------------ |
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297 |
// ciField::constant_value_of |
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298 |
// Get the constant value of non-static final field in the given object. |
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299 |
ciConstant ciField::constant_value_of(ciObject* object) { |
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300 |
assert(!is_static() && is_constant(), "only if field is non-static constant"); |
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|
301 |
assert(object->is_instance(), "must be instance"); |
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302 |
ciConstant field_value = object->as_instance()->field_value(this); |
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303 |
if (FoldStableValues && is_stable() && field_value.is_null_or_zero()) { |
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304 |
return ciConstant(); |
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|
305 |
} |
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|
306 |
return field_value; |
1 | 307 |
} |
308 |
||
309 |
// ------------------------------------------------------------------ |
|
310 |
// ciField::compute_type |
|
311 |
// |
|
312 |
// Lazily compute the type, if it is an instance klass. |
|
313 |
ciType* ciField::compute_type() { |
|
314 |
GUARDED_VM_ENTRY(return compute_type_impl();) |
|
315 |
} |
|
316 |
||
317 |
ciType* ciField::compute_type_impl() { |
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|
318 |
ciKlass* type = CURRENT_ENV->get_klass_by_name_impl(_holder, constantPoolHandle(), _signature, false); |
1 | 319 |
if (!type->is_primitive_type() && is_shared()) { |
320 |
// We must not cache a pointer to an unshared type, in a shared field. |
|
321 |
bool type_is_also_shared = false; |
|
322 |
if (type->is_type_array_klass()) { |
|
323 |
type_is_also_shared = true; // int[] etc. are explicitly bootstrapped |
|
324 |
} else if (type->is_instance_klass()) { |
|
325 |
type_is_also_shared = type->as_instance_klass()->is_shared(); |
|
326 |
} else { |
|
327 |
// Currently there is no 'shared' query for array types. |
|
328 |
type_is_also_shared = !ciObjectFactory::is_initialized(); |
|
329 |
} |
|
330 |
if (!type_is_also_shared) |
|
331 |
return type; // Bummer. |
|
332 |
} |
|
333 |
_type = type; |
|
334 |
return type; |
|
335 |
} |
|
336 |
||
337 |
||
338 |
// ------------------------------------------------------------------ |
|
339 |
// ciField::will_link |
|
340 |
// |
|
341 |
// Can a specific access to this field be made without causing |
|
342 |
// link errors? |
|
343 |
bool ciField::will_link(ciInstanceKlass* accessing_klass, |
|
344 |
Bytecodes::Code bc) { |
|
345 |
VM_ENTRY_MARK; |
|
12982 | 346 |
assert(bc == Bytecodes::_getstatic || bc == Bytecodes::_putstatic || |
347 |
bc == Bytecodes::_getfield || bc == Bytecodes::_putfield, |
|
348 |
"unexpected bytecode"); |
|
349 |
||
1 | 350 |
if (_offset == -1) { |
351 |
// at creation we couldn't link to our holder so we need to |
|
352 |
// maintain that stance, otherwise there's no safe way to use this |
|
353 |
// ciField. |
|
354 |
return false; |
|
355 |
} |
|
356 |
||
12982 | 357 |
// Check for static/nonstatic mismatch |
358 |
bool is_static = (bc == Bytecodes::_getstatic || bc == Bytecodes::_putstatic); |
|
359 |
if (is_static != this->is_static()) { |
|
360 |
return false; |
|
361 |
} |
|
362 |
||
363 |
// Get and put can have different accessibility rules |
|
364 |
bool is_put = (bc == Bytecodes::_putfield || bc == Bytecodes::_putstatic); |
|
365 |
if (is_put) { |
|
366 |
if (_known_to_link_with_put == accessing_klass) { |
|
367 |
return true; |
|
368 |
} |
|
12984 | 369 |
} else { |
12982 | 370 |
if (_known_to_link_with_get == accessing_klass) { |
371 |
return true; |
|
372 |
} |
|
1 | 373 |
} |
374 |
||
31019 | 375 |
LinkInfo link_info(_holder->get_instanceKlass(), |
376 |
_name->get_symbol(), _signature->get_symbol(), |
|
377 |
accessing_klass->get_Klass()); |
|
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|
378 |
fieldDescriptor result; |
31019 | 379 |
LinkResolver::resolve_field(result, link_info, bc, false, KILL_COMPILE_ON_FATAL_(false)); |
1 | 380 |
|
381 |
// update the hit-cache, unless there is a problem with memory scoping: |
|
12982 | 382 |
if (accessing_klass->is_shared() || !is_shared()) { |
383 |
if (is_put) { |
|
384 |
_known_to_link_with_put = accessing_klass; |
|
385 |
} else { |
|
386 |
_known_to_link_with_get = accessing_klass; |
|
387 |
} |
|
388 |
} |
|
1 | 389 |
|
390 |
return true; |
|
391 |
} |
|
392 |
||
393 |
// ------------------------------------------------------------------ |
|
394 |
// ciField::print |
|
395 |
void ciField::print() { |
|
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|
396 |
tty->print("<ciField name="); |
1 | 397 |
_holder->print_name(); |
398 |
tty->print("."); |
|
399 |
_name->print_symbol(); |
|
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|
400 |
tty->print(" signature="); |
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|
401 |
_signature->print_symbol(); |
1 | 402 |
tty->print(" offset=%d type=", _offset); |
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|
403 |
if (_type != NULL) |
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|
404 |
_type->print_name(); |
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|
405 |
else |
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|
406 |
tty->print("(reference)"); |
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|
407 |
tty->print(" flags=%04x", flags().as_int()); |
1 | 408 |
tty->print(" is_constant=%s", bool_to_str(_is_constant)); |
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|
409 |
if (_is_constant && is_static()) { |
1 | 410 |
tty->print(" constant_value="); |
411 |
_constant_value.print(); |
|
412 |
} |
|
413 |
tty->print(">"); |
|
414 |
} |
|
415 |
||
416 |
// ------------------------------------------------------------------ |
|
417 |
// ciField::print_name_on |
|
418 |
// |
|
419 |
// Print the name of this field |
|
420 |
void ciField::print_name_on(outputStream* st) { |
|
421 |
name()->print_symbol_on(st); |
|
422 |
} |