/* * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "compiler/compileBroker.hpp" #include "gc_interface/collectedHeap.inline.hpp" #include "interpreter/bytecode.hpp" #include "interpreter/interpreterRuntime.hpp" #include "interpreter/linkResolver.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.inline.hpp" #include "oops/instanceKlass.hpp" #include "oops/objArrayOop.hpp" #include "prims/methodHandles.hpp" #include "prims/nativeLookup.hpp" #include "runtime/compilationPolicy.hpp" #include "runtime/fieldDescriptor.hpp" #include "runtime/frame.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/reflection.hpp" #include "runtime/signature.hpp" #include "runtime/vmThread.hpp" #ifdef TARGET_OS_FAMILY_linux # include "thread_linux.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_solaris # include "thread_solaris.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_windows # include "thread_windows.inline.hpp" #endif //------------------------------------------------------------------------------------------------------------------------ // Implementation of FieldAccessInfo void FieldAccessInfo::set(KlassHandle klass, Symbol* name, int field_index, int field_offset, BasicType field_type, AccessFlags access_flags) { _klass = klass; _name = name; _field_index = field_index; _field_offset = field_offset; _field_type = field_type; _access_flags = access_flags; } //------------------------------------------------------------------------------------------------------------------------ // Implementation of CallInfo void CallInfo::set_static(KlassHandle resolved_klass, methodHandle resolved_method, TRAPS) { int vtable_index = methodOopDesc::nonvirtual_vtable_index; set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, vtable_index, CHECK); } void CallInfo::set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, TRAPS) { // This is only called for interface methods. If the resolved_method // comes from java/lang/Object, it can be the subject of a virtual call, so // we should pick the vtable index from the resolved method. // Other than that case, there is no valid vtable index to specify. int vtable_index = methodOopDesc::invalid_vtable_index; if (resolved_method->method_holder() == SystemDictionary::Object_klass()) { assert(resolved_method->vtable_index() == selected_method->vtable_index(), "sanity check"); vtable_index = resolved_method->vtable_index(); } set_common(resolved_klass, selected_klass, resolved_method, selected_method, vtable_index, CHECK); } void CallInfo::set_virtual(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS) { assert(vtable_index >= 0 || vtable_index == methodOopDesc::nonvirtual_vtable_index, "valid index"); set_common(resolved_klass, selected_klass, resolved_method, selected_method, vtable_index, CHECK); } void CallInfo::set_dynamic(methodHandle resolved_method, TRAPS) { assert(resolved_method->is_method_handle_invoke(), ""); KlassHandle resolved_klass = SystemDictionaryHandles::MethodHandle_klass(); assert(resolved_klass == resolved_method->method_holder(), ""); int vtable_index = methodOopDesc::nonvirtual_vtable_index; assert(resolved_method->vtable_index() == vtable_index, ""); set_common(resolved_klass, KlassHandle(), resolved_method, resolved_method, vtable_index, CHECK); } void CallInfo::set_common(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS) { assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond"); _resolved_klass = resolved_klass; _selected_klass = selected_klass; _resolved_method = resolved_method; _selected_method = selected_method; _vtable_index = vtable_index; if (CompilationPolicy::must_be_compiled(selected_method)) { // This path is unusual, mostly used by the '-Xcomp' stress test mode. // Note: with several active threads, the must_be_compiled may be true // while can_be_compiled is false; remove assert // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile"); if (THREAD->is_Compiler_thread()) { // don't force compilation, resolve was on behalf of compiler return; } if (instanceKlass::cast(selected_method->method_holder())->is_not_initialized()) { // 'is_not_initialized' means not only '!is_initialized', but also that // initialization has not been started yet ('!being_initialized') // Do not force compilation of methods in uninitialized classes. // Note that doing this would throw an assert later, // in CompileBroker::compile_method. // We sometimes use the link resolver to do reflective lookups // even before classes are initialized. return; } CompileBroker::compile_method(selected_method, InvocationEntryBci, CompLevel_initial_compile, methodHandle(), 0, "must_be_compiled", CHECK); } } //------------------------------------------------------------------------------------------------------------------------ // Klass resolution void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) { if (!Reflection::verify_class_access(ref_klass->as_klassOop(), sel_klass->as_klassOop(), true)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "tried to access class %s from class %s", sel_klass->external_name(), ref_klass->external_name() ); return; } } void LinkResolver::resolve_klass(KlassHandle& result, constantPoolHandle pool, int index, TRAPS) { klassOop result_oop = pool->klass_ref_at(index, CHECK); result = KlassHandle(THREAD, result_oop); } void LinkResolver::resolve_klass_no_update(KlassHandle& result, constantPoolHandle pool, int index, TRAPS) { klassOop result_oop = constantPoolOopDesc::klass_ref_at_if_loaded_check(pool, index, CHECK); result = KlassHandle(THREAD, result_oop); } //------------------------------------------------------------------------------------------------------------------------ // Method resolution // // According to JVM spec. $5.4.3c & $5.4.3d void LinkResolver::lookup_method_in_klasses(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { methodOop result_oop = klass->uncached_lookup_method(name, signature); if (EnableInvokeDynamic && result_oop != NULL) { switch (result_oop->intrinsic_id()) { case vmIntrinsics::_invokeExact: case vmIntrinsics::_invokeGeneric: case vmIntrinsics::_invokeDynamic: // Do not link directly to these. The VM must produce a synthetic one using lookup_implicit_method. return; } } result = methodHandle(THREAD, result_oop); } // returns first instance method void LinkResolver::lookup_instance_method_in_klasses(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { methodOop result_oop = klass->uncached_lookup_method(name, signature); result = methodHandle(THREAD, result_oop); while (!result.is_null() && result->is_static()) { klass = KlassHandle(THREAD, Klass::cast(result->method_holder())->super()); result = methodHandle(THREAD, klass->uncached_lookup_method(name, signature)); } } int LinkResolver::vtable_index_of_miranda_method(KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { ResourceMark rm(THREAD); klassVtable *vt = instanceKlass::cast(klass())->vtable(); return vt->index_of_miranda(name, signature); } void LinkResolver::lookup_method_in_interfaces(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { instanceKlass *ik = instanceKlass::cast(klass()); result = methodHandle(THREAD, ik->lookup_method_in_all_interfaces(name, signature)); } void LinkResolver::lookup_implicit_method(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, KlassHandle current_klass, TRAPS) { if (EnableInvokeDynamic && klass() == SystemDictionary::MethodHandle_klass() && methodOopDesc::is_method_handle_invoke_name(name)) { if (!THREAD->is_Compiler_thread() && !MethodHandles::enabled()) { // Make sure the Java part of the runtime has been booted up. klassOop natives = SystemDictionary::MethodHandleNatives_klass(); if (natives == NULL || instanceKlass::cast(natives)->is_not_initialized()) { SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(), Handle(), Handle(), true, CHECK); } } methodOop result_oop = SystemDictionary::find_method_handle_invoke(name, signature, current_klass, CHECK); if (result_oop != NULL) { assert(result_oop->is_method_handle_invoke() && result_oop->signature() == signature, "consistent"); result = methodHandle(THREAD, result_oop); } } } void LinkResolver::check_method_accessability(KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS) { AccessFlags flags = sel_method->access_flags(); // Special case: arrays always override "clone". JVMS 2.15. // If the resolved klass is an array class, and the declaring class // is java.lang.Object and the method is "clone", set the flags // to public. // // We'll check for the method name first, as that's most likely // to be false (so we'll short-circuit out of these tests). if (sel_method->name() == vmSymbols::clone_name() && sel_klass() == SystemDictionary::Object_klass() && resolved_klass->oop_is_array()) { // We need to change "protected" to "public". assert(flags.is_protected(), "clone not protected?"); jint new_flags = flags.as_int(); new_flags = new_flags & (~JVM_ACC_PROTECTED); new_flags = new_flags | JVM_ACC_PUBLIC; flags.set_flags(new_flags); } if (!Reflection::verify_field_access(ref_klass->as_klassOop(), resolved_klass->as_klassOop(), sel_klass->as_klassOop(), flags, true)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "tried to access method %s.%s%s from class %s", sel_klass->external_name(), sel_method->name()->as_C_string(), sel_method->signature()->as_C_string(), ref_klass->external_name() ); return; } } void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle& resolved_klass, constantPoolHandle pool, int index, TRAPS) { // resolve klass resolve_klass(resolved_klass, pool, index, CHECK); Symbol* method_name = pool->name_ref_at(index); Symbol* method_signature = pool->signature_ref_at(index); KlassHandle current_klass(THREAD, pool->pool_holder()); resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK); } void LinkResolver::resolve_dynamic_method(methodHandle& resolved_method, KlassHandle& resolved_klass, constantPoolHandle pool, int index, TRAPS) { // The class is java.lang.invoke.MethodHandle resolved_klass = SystemDictionaryHandles::MethodHandle_klass(); Symbol* method_name = vmSymbols::invokeExact_name(); Symbol* method_signature = pool->signature_ref_at(index); KlassHandle current_klass (THREAD, pool->pool_holder()); resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK); } void LinkResolver::resolve_interface_method(methodHandle& resolved_method, KlassHandle& resolved_klass, constantPoolHandle pool, int index, TRAPS) { // resolve klass resolve_klass(resolved_klass, pool, index, CHECK); Symbol* method_name = pool->name_ref_at(index); Symbol* method_signature = pool->signature_ref_at(index); KlassHandle current_klass(THREAD, pool->pool_holder()); resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, CHECK); } void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { // 1. check if klass is not interface if (resolved_klass->is_interface()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", Klass::cast(resolved_klass())->external_name()); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // 2. lookup method in resolved klass and its super klasses lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK); if (resolved_method.is_null()) { // not found in the class hierarchy // 3. lookup method in all the interfaces implemented by the resolved klass lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK); if (resolved_method.is_null()) { // JSR 292: see if this is an implicitly generated method MethodHandle.invoke(*...) lookup_implicit_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, CHECK); } if (resolved_method.is_null()) { // 4. method lookup failed ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), method_name, method_signature)); } } // 5. check if method is concrete if (resolved_method->is_abstract() && !resolved_klass->is_abstract()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), method_name, method_signature)); } // 6. access checks, access checking may be turned off when calling from within the VM. if (check_access) { assert(current_klass.not_null() , "current_klass should not be null"); // check if method can be accessed by the referring class check_method_accessability(current_klass, resolved_klass, KlassHandle(THREAD, resolved_method->method_holder()), resolved_method, CHECK); // check loader constraints Handle loader (THREAD, instanceKlass::cast(current_klass())->class_loader()); Handle class_loader (THREAD, instanceKlass::cast(resolved_method->method_holder())->class_loader()); { ResourceMark rm(THREAD); char* failed_type_name = SystemDictionary::check_signature_loaders(method_signature, loader, class_loader, true, CHECK); if (failed_type_name != NULL) { const char* msg = "loader constraint violation: when resolving method" " \"%s\" the class loader (instance of %s) of the current class, %s," " and the class loader (instance of %s) for resolved class, %s, have" " different Class objects for the type %s used in the signature"; char* sig = methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),method_name,method_signature); const char* loader1 = SystemDictionary::loader_name(loader()); char* current = instanceKlass::cast(current_klass())->name()->as_C_string(); const char* loader2 = SystemDictionary::loader_name(class_loader()); char* resolved = instanceKlass::cast(resolved_klass())->name()->as_C_string(); size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + strlen(current) + strlen(loader2) + strlen(resolved) + strlen(failed_type_name); char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, resolved, failed_type_name); THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); } } } } void LinkResolver::resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { // check if klass is interface if (!resolved_klass->is_interface()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", Klass::cast(resolved_klass())->external_name()); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // lookup method in this interface or its super, java.lang.Object lookup_instance_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK); if (resolved_method.is_null()) { // lookup method in all the super-interfaces lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK); if (resolved_method.is_null()) { // no method found ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), method_name, method_signature)); } } if (check_access) { HandleMark hm(THREAD); Handle loader (THREAD, instanceKlass::cast(current_klass())->class_loader()); Handle class_loader (THREAD, instanceKlass::cast(resolved_method->method_holder())->class_loader()); { ResourceMark rm(THREAD); char* failed_type_name = SystemDictionary::check_signature_loaders(method_signature, loader, class_loader, true, CHECK); if (failed_type_name != NULL) { const char* msg = "loader constraint violation: when resolving " "interface method \"%s\" the class loader (instance of %s) of the " "current class, %s, and the class loader (instance of %s) for " "resolved class, %s, have different Class objects for the type %s " "used in the signature"; char* sig = methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),method_name,method_signature); const char* loader1 = SystemDictionary::loader_name(loader()); char* current = instanceKlass::cast(current_klass())->name()->as_C_string(); const char* loader2 = SystemDictionary::loader_name(class_loader()); char* resolved = instanceKlass::cast(resolved_klass())->name()->as_C_string(); size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + strlen(current) + strlen(loader2) + strlen(resolved) + strlen(failed_type_name); char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, resolved, failed_type_name); THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); } } } } //------------------------------------------------------------------------------------------------------------------------ // Field resolution void LinkResolver::check_field_accessability(KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS) { if (!Reflection::verify_field_access(ref_klass->as_klassOop(), resolved_klass->as_klassOop(), sel_klass->as_klassOop(), fd.access_flags(), true)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "tried to access field %s.%s from class %s", sel_klass->external_name(), fd.name()->as_C_string(), ref_klass->external_name() ); return; } } void LinkResolver::resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS) { resolve_field(result, pool, index, byte, check_only, true, CHECK); } void LinkResolver::resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS) { assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || byte == Bytecodes::_getfield || byte == Bytecodes::_putfield, "bad bytecode"); bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic); // resolve specified klass KlassHandle resolved_klass; if (update_pool) { resolve_klass(resolved_klass, pool, index, CHECK); } else { resolve_klass_no_update(resolved_klass, pool, index, CHECK); } // Load these early in case the resolve of the containing klass fails Symbol* field = pool->name_ref_at(index); Symbol* sig = pool->signature_ref_at(index); // Check if there's a resolved klass containing the field if( resolved_klass.is_null() ) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); } // Resolve instance field fieldDescriptor fd; // find_field initializes fd if found KlassHandle sel_klass(THREAD, instanceKlass::cast(resolved_klass())->find_field(field, sig, &fd)); // check if field exists; i.e., if a klass containing the field def has been selected if (sel_klass.is_null()){ ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); } // check access KlassHandle ref_klass(THREAD, pool->pool_holder()); check_field_accessability(ref_klass, resolved_klass, sel_klass, fd, CHECK); // check for errors if (is_static != fd.is_static()) { ResourceMark rm(THREAD); char msg[200]; jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", Klass::cast(resolved_klass())->external_name(), fd.name()->as_C_string()); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); } // Final fields can only be accessed from its own class. if (is_put && fd.access_flags().is_final() && sel_klass() != pool->pool_holder()) { THROW(vmSymbols::java_lang_IllegalAccessError()); } // initialize resolved_klass if necessary // note 1: the klass which declared the field must be initialized (i.e, sel_klass) // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) // // note 2: we don't want to force initialization if we are just checking // if the field access is legal; e.g., during compilation if (is_static && !check_only) { sel_klass->initialize(CHECK); } { HandleMark hm(THREAD); Handle ref_loader (THREAD, instanceKlass::cast(ref_klass())->class_loader()); Handle sel_loader (THREAD, instanceKlass::cast(sel_klass())->class_loader()); Symbol* signature_ref = pool->signature_ref_at(index); { ResourceMark rm(THREAD); char* failed_type_name = SystemDictionary::check_signature_loaders(signature_ref, ref_loader, sel_loader, false, CHECK); if (failed_type_name != NULL) { const char* msg = "loader constraint violation: when resolving field" " \"%s\" the class loader (instance of %s) of the referring class, " "%s, and the class loader (instance of %s) for the field's resolved " "type, %s, have different Class objects for that type"; char* field_name = field->as_C_string(); const char* loader1 = SystemDictionary::loader_name(ref_loader()); char* sel = instanceKlass::cast(sel_klass())->name()->as_C_string(); const char* loader2 = SystemDictionary::loader_name(sel_loader()); size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1) + strlen(sel) + strlen(loader2) + strlen(failed_type_name); char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); jio_snprintf(buf, buflen, msg, field_name, loader1, sel, loader2, failed_type_name); THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); } } } // return information. note that the klass is set to the actual klass containing the // field, otherwise access of static fields in superclasses will not work. KlassHandle holder (THREAD, fd.field_holder()); Symbol* name = fd.name(); result.set(holder, name, fd.index(), fd.offset(), fd.field_type(), fd.access_flags()); } //------------------------------------------------------------------------------------------------------------------------ // Invoke resolution // // Naming conventions: // // resolved_method the specified method (i.e., static receiver specified via constant pool index) // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) // resolved_klass the specified klass (i.e., specified via constant pool index) // recv_klass the receiver klass void LinkResolver::resolve_static_call(CallInfo& result, KlassHandle& resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool initialize_class, TRAPS) { methodHandle resolved_method; linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); resolved_klass = KlassHandle(THREAD, Klass::cast(resolved_method->method_holder())); // Initialize klass (this should only happen if everything is ok) if (initialize_class && resolved_klass->should_be_initialized()) { resolved_klass->initialize(CHECK); linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); } // setup result result.set_static(resolved_klass, resolved_method, CHECK); } // throws linktime exceptions void LinkResolver::linktime_resolve_static_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); // check if static if (!resolved_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expected static method %s", methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), resolved_method->name(), resolved_method->signature())); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } } void LinkResolver::resolve_special_call(CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { methodHandle resolved_method; linktime_resolve_special_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); runtime_resolve_special_method(result, resolved_method, resolved_klass, current_klass, check_access, CHECK); } // throws linktime exceptions void LinkResolver::linktime_resolve_special_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); // check if method name is , that it is found in same klass as static type if (resolved_method->name() == vmSymbols::object_initializer_name() && resolved_method->method_holder() != resolved_klass()) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_NoSuchMethodError(), "%s: method %s%s not found", resolved_klass->external_name(), resolved_method->name()->as_C_string(), resolved_method->signature()->as_C_string() ); return; } // check if not static if (resolved_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), resolved_method->name(), resolved_method->signature())); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } } // throws runtime exceptions void LinkResolver::runtime_resolve_special_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS) { // resolved method is selected method unless we have an old-style lookup methodHandle sel_method(THREAD, resolved_method()); // check if this is an old-style super call and do a new lookup if so { KlassHandle method_klass = KlassHandle(THREAD, resolved_method->method_holder()); if (check_access && // a) check if ACC_SUPER flag is set for the current class current_klass->is_super() && // b) check if the method class is a superclass of the current class (superclass relation is not reflexive!) current_klass->is_subtype_of(method_klass()) && current_klass() != method_klass() && // c) check if the method is not resolved_method->name() != vmSymbols::object_initializer_name()) { // Lookup super method KlassHandle super_klass(THREAD, current_klass->super()); lookup_instance_method_in_klasses(sel_method, super_klass, resolved_method->name(), resolved_method->signature(), CHECK); // check if found if (sel_method.is_null()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), resolved_method->name(), resolved_method->signature())); } } } // check if not static if (sel_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), resolved_method->name(), resolved_method->signature())); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // check if abstract if (sel_method->is_abstract()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), sel_method->name(), sel_method->signature())); } // setup result result.set_static(resolved_klass, sel_method, CHECK); } void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS) { methodHandle resolved_method; linktime_resolve_virtual_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, check_null_and_abstract, CHECK); } // throws linktime exceptions void LinkResolver::linktime_resolve_virtual_method(methodHandle &resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { // normal method resolution resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); // check if not static if (resolved_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), resolved_method->name(), resolved_method->signature())); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } } // throws runtime exceptions void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS) { // setup default return values int vtable_index = methodOopDesc::invalid_vtable_index; methodHandle selected_method; assert(recv.is_null() || recv->is_oop(), "receiver is not an oop"); // runtime method resolution if (check_null_and_abstract && recv.is_null()) { // check if receiver exists THROW(vmSymbols::java_lang_NullPointerException()); } // Virtual methods cannot be resolved before its klass has been linked, for otherwise the methodOop's // has not been rewritten, and the vtable initialized. assert(instanceKlass::cast(resolved_method->method_holder())->is_linked(), "must be linked"); // Virtual methods cannot be resolved before its klass has been linked, for otherwise the methodOop's // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since // a missing receiver might result in a bogus lookup. assert(instanceKlass::cast(resolved_method->method_holder())->is_linked(), "must be linked"); // do lookup based on receiver klass using the vtable index if (resolved_method->method_holder()->klass_part()->is_interface()) { // miranda method vtable_index = vtable_index_of_miranda_method(resolved_klass, resolved_method->name(), resolved_method->signature(), CHECK); assert(vtable_index >= 0 , "we should have valid vtable index at this point"); instanceKlass* inst = instanceKlass::cast(recv_klass()); selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index)); } else { // at this point we are sure that resolved_method is virtual and not // a miranda method; therefore, it must have a valid vtable index. vtable_index = resolved_method->vtable_index(); // We could get a negative vtable_index for final methods, // because as an optimization they are they are never put in the vtable, // unless they override an existing method. // If we do get a negative, it means the resolved method is the the selected // method, and it can never be changed by an override. if (vtable_index == methodOopDesc::nonvirtual_vtable_index) { assert(resolved_method->can_be_statically_bound(), "cannot override this method"); selected_method = resolved_method; } else { // recv_klass might be an arrayKlassOop but all vtables start at // the same place. The cast is to avoid virtual call and assertion. instanceKlass* inst = (instanceKlass*)recv_klass()->klass_part(); selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index)); } } // check if method exists if (selected_method.is_null()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), resolved_method->name(), resolved_method->signature())); } // check if abstract if (check_null_and_abstract && selected_method->is_abstract()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()), selected_method->name(), selected_method->signature())); } // setup result result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); } void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS) { methodHandle resolved_method; linktime_resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); runtime_resolve_interface_method(result, resolved_method, resolved_klass, recv, recv_klass, check_null_and_abstract, CHECK); } // throws linktime exceptions void LinkResolver::linktime_resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { // normal interface method resolution resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); } // throws runtime exceptions void LinkResolver::runtime_resolve_interface_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS) { // check if receiver exists if (check_null_and_abstract && recv.is_null()) { THROW(vmSymbols::java_lang_NullPointerException()); } // check if receiver klass implements the resolved interface if (!recv_klass->is_subtype_of(resolved_klass())) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", (Klass::cast(recv_klass()))->external_name(), (Klass::cast(resolved_klass()))->external_name()); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // do lookup based on receiver klass methodHandle sel_method; lookup_instance_method_in_klasses(sel_method, recv_klass, resolved_method->name(), resolved_method->signature(), CHECK); // check if method exists if (sel_method.is_null()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(recv_klass()), resolved_method->name(), resolved_method->signature())); } // check if public if (!sel_method->is_public()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(recv_klass()), sel_method->name(), sel_method->signature())); } // check if abstract if (check_null_and_abstract && sel_method->is_abstract()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), methodOopDesc::name_and_sig_as_C_string(Klass::cast(recv_klass()), sel_method->name(), sel_method->signature())); } // setup result result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, CHECK); } methodHandle LinkResolver::linktime_resolve_interface_method_or_null( KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access) { EXCEPTION_MARK; methodHandle method_result; linktime_resolve_interface_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } else { return method_result; } } methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access) { EXCEPTION_MARK; methodHandle method_result; linktime_resolve_virtual_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } else { return method_result; } } methodHandle LinkResolver::resolve_virtual_call_or_null( KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass) { EXCEPTION_MARK; CallInfo info; resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } methodHandle LinkResolver::resolve_interface_call_or_null( KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass) { EXCEPTION_MARK; CallInfo info; resolve_interface_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } int LinkResolver::resolve_virtual_vtable_index( KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass) { EXCEPTION_MARK; CallInfo info; resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodOopDesc::invalid_vtable_index; } return info.vtable_index(); } methodHandle LinkResolver::resolve_static_call_or_null( KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass) { EXCEPTION_MARK; CallInfo info; resolve_static_call(info, resolved_klass, name, signature, current_klass, true, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } methodHandle LinkResolver::resolve_special_call_or_null(KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass) { EXCEPTION_MARK; CallInfo info; resolve_special_call(info, resolved_klass, name, signature, current_klass, true, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } //------------------------------------------------------------------------------------------------------------------------ // ConstantPool entries void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) { switch (byte) { case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break; case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; } return; } void LinkResolver::resolve_pool(KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS) { // resolve klass resolve_klass(resolved_klass, pool, index, CHECK); // Get name, signature, and static klass method_name = pool->name_ref_at(index); method_signature = pool->signature_ref_at(index); current_klass = KlassHandle(THREAD, pool->pool_holder()); } void LinkResolver::resolve_invokestatic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); resolve_static_call(result, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK); } void LinkResolver::resolve_invokespecial(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); resolve_special_call(result, resolved_klass, method_name, method_signature, current_klass, true, CHECK); } void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) { KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); KlassHandle recvrKlass (THREAD, recv.is_null() ? (klassOop)NULL : recv->klass()); resolve_virtual_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK); } void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) { KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); KlassHandle recvrKlass (THREAD, recv.is_null() ? (klassOop)NULL : recv->klass()); resolve_interface_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK); } void LinkResolver::resolve_invokedynamic(CallInfo& result, constantPoolHandle pool, int raw_index, TRAPS) { assert(EnableInvokeDynamic, ""); // This guy is reached from InterpreterRuntime::resolve_invokedynamic. // At this point, we only need the signature, and can ignore the name. Symbol* method_signature = pool->signature_ref_at(raw_index); // raw_index works directly Symbol* method_name = vmSymbols::invokeExact_name(); KlassHandle resolved_klass = SystemDictionaryHandles::MethodHandle_klass(); // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) // The extra MH receiver will be inserted into the stack on every call. methodHandle resolved_method; KlassHandle current_klass(THREAD, pool->pool_holder()); lookup_implicit_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, CHECK); if (resolved_method.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } result.set_dynamic(resolved_method, CHECK); } //------------------------------------------------------------------------------------------------------------------------ #ifndef PRODUCT void FieldAccessInfo::print() { ResourceMark rm; tty->print_cr("Field %s@%d", name()->as_C_string(), field_offset()); } #endif