165 lines
7.9 KiB
C++
165 lines
7.9 KiB
C++
/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2018, SAP SE. 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 "classfile/systemDictionary.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/constantPool.hpp"
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#include "oops/reflectionAccessorImplKlassHelper.hpp"
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#include "utilities/constantTag.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/globalDefinitions.hpp"
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// This code extracts name of target class, method and signature from the constant pool of a class
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// assumed to be of type jdk/internal/reflect/Generated{SerializationConstructor|Constructor|Method}AccessorXXX.
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// Since this may be affected by bitrot if these classes change, extra care is taken to make the
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// release build of this coding robust.
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// We extract target class name, method name and sig from the constant pool of the Accessor class.
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// This is an excerpt of the Constant pool (see jdk/internal/reflect/MethodAccessorGenerator.java:)
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// (^ = Only present if generating SerializationConstructorAccessor)
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// 1 [UTF-8] [This class's name]
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// 2 [CONSTANT_Class_info] for above
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// 3 [UTF-8] "jdk/internal/reflect/{MethodAccessorImpl,ConstructorAccessorImpl,SerializationConstructorAccessorImpl}"
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// 4 [CONSTANT_Class_info] for above
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// 5 [UTF-8] [Target class's name]
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// 6 [CONSTANT_Class_info] for above
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// 7^ [UTF-8] [Serialization: Class's name in which to invoke constructor]
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// 8^ [CONSTANT_Class_info] for above
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// 9 [UTF-8] target method or constructor name
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// 10 [UTF-8] target method or constructor signature
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// Note that these strings are found at slightly different slots depending on the class type:
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// - MethodAccessorImpl, ConstructoreAccessorImpl: slots 5, 7 and 8.
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// - SerializationConstructorAccessorImpl: slots 5, 9 and 10.
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// Unfortunately SerializationConstructorAccessorImpl is a child of ConstructoreAccessorImpl and there
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// is no easy way to tell them apart. So we examine parent class name.
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enum cpi_slots {
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cpi_slot_parent_class_name = 3,
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cpi_slot_target_class_name = 5,
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cpi_slot_target_method_name = 7,
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cpi_slot_target_method_name_sca = 9, // SerializationConstructorAccessor case, see above
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cpi_slot_target_method_sig = 8,
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cpi_slot_target_method_sig_sca = 10 // SerializationConstructorAccessor case, see above
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};
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// Returns a string, resource-area allocated, from an UTF8 slot in the constant pool in the
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// given Klass*.
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static const char* get_string_from_cp_with_checks(const InstanceKlass* k, int cpi) {
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const char* s = NULL;
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const ConstantPool* const cp = k->constants();
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assert(cp != NULL, "No cp?");
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assert(cp->is_within_bounds(cpi), "Unexpected constant pool layout for \"%s\", child class of Generated{Method|Constructor}AccessorImplXXX"
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" (cpi %d out of bounds for [0..%d)).", k->external_name(), cpi, cp->length());
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assert(cp->tag_at(cpi).is_utf8(), "Unexpected constant pool layout for \"%s\", child class of Generated{Method|Constructor}AccessorImplXXX"
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" (no UTF8 at cpi %d (%u)).", k->external_name(), cpi, cp->tag_at(cpi).value());
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// Be nice in release: lets not crash, just return NULL.
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if (cp != NULL && cp->is_within_bounds(cpi) && cp->tag_at(cpi).is_utf8()) {
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s = cp->symbol_at(cpi)->as_C_string();
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}
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return s;
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}
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// helper, returns true if class name of given class matches a given prefix
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static bool classname_matches_prefix(const Klass* k, const char* prefix) {
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const char* classname = k->external_name();
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if (classname != NULL) {
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if (::strncmp(classname, prefix, strlen(prefix)) == 0) {
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return true;
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}
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}
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return false;
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}
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// Returns true if k is of type jdk/internal/reflect/GeneratedMethodAccessorXXX.
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bool ReflectionAccessorImplKlassHelper::is_generated_method_accessor(const InstanceKlass* k) {
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return k->super() == SystemDictionary::reflect_MethodAccessorImpl_klass() &&
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classname_matches_prefix(k, "jdk.internal.reflect.GeneratedMethodAccessor");
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}
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// Returns true if k is of type jdk/internal/reflect/GeneratedConstructorAccessorXXX.
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bool ReflectionAccessorImplKlassHelper::is_generated_constructor_accessor(const InstanceKlass* k) {
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return k->super() == SystemDictionary::reflect_ConstructorAccessorImpl_klass() &&
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classname_matches_prefix(k, "jdk.internal.reflect.GeneratedConstructorAccessor");
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}
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// Returns true if k is of type jdk/internal/reflect/GeneratedSerializationConstructorAccessorXXX.
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bool ReflectionAccessorImplKlassHelper::is_generated_method_serialization_constructor_accessor(const InstanceKlass* k) {
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// GeneratedSerializationConstructorAccessor is not a direct subclass of ConstructorAccessorImpl
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const Klass* sk = k->super();
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if (sk != NULL && sk->super() == SystemDictionary::reflect_ConstructorAccessorImpl_klass() &&
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classname_matches_prefix(k, "jdk.internal.reflect.GeneratedSerializationConstructorAccessor")) {
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return true;
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}
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return false;
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}
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const char* ReflectionAccessorImplKlassHelper::get_target_class_name(const InstanceKlass* k) {
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return get_string_from_cp_with_checks(k, cpi_slot_target_class_name);
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}
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const char* ReflectionAccessorImplKlassHelper::get_target_method_name(const InstanceKlass* k) {
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const int target_method_name_cpi =
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is_generated_method_serialization_constructor_accessor(k) ? cpi_slot_target_method_name_sca : cpi_slot_target_method_name;
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return get_string_from_cp_with_checks(k, target_method_name_cpi);
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}
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const char* ReflectionAccessorImplKlassHelper::get_target_method_signature(const InstanceKlass* k) {
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const int target_method_name_cpi =
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is_generated_method_serialization_constructor_accessor(k) ? cpi_slot_target_method_sig_sca : cpi_slot_target_method_sig;
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return get_string_from_cp_with_checks(k, target_method_name_cpi);
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}
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// Returns true if this is either one of jdk/internal/reflect/Generated{SerializationConstructor|Constructor|Method}AccessorXXX
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// and it is safe to call print_invocation_target(k)
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bool ReflectionAccessorImplKlassHelper::is_generated_accessor(const Klass* k) {
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if (k != NULL && k->is_instance_klass()) {
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const InstanceKlass* ik = InstanceKlass::cast(k);
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if (ik->is_initialized()) {
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return is_generated_method_accessor(ik) ||
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is_generated_constructor_accessor(ik) ||
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is_generated_method_serialization_constructor_accessor(ik);
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}
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}
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return false;
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}
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void ReflectionAccessorImplKlassHelper::print_invocation_target(outputStream* out, Klass* k) {
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assert(ReflectionAccessorImplKlassHelper::is_generated_accessor(k), "Invariant");
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InstanceKlass* ik = InstanceKlass::cast(k);
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ResourceMark rm;
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const char* target_class_name = ReflectionAccessorImplKlassHelper::get_target_class_name(ik);
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const char* target_method_name = ReflectionAccessorImplKlassHelper::get_target_method_name(ik);
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const char* target_method_signature = ReflectionAccessorImplKlassHelper::get_target_method_signature(ik);
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out->print("%s::%s %s",
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target_class_name != NULL ? target_class_name : "?",
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target_method_name != NULL ? target_method_name : "?",
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target_method_signature != NULL ? target_method_signature : "?");
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}
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