linkResolver.cpp

/*
 * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

#include "incls/_precompiled.incl"
#include "incls/_linkResolver.cpp.incl"

//------------------------------------------------------------------------------------------------------------------------
// Implementation of FieldAccessInfo

void FieldAccessInfo::set(KlassHandle klass, symbolHandle 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_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::mustBeCompiled(selected_method)) {
    // This path is unusual, mostly used by the '-Xcomp' stress test mode.

    // Note: with several active threads, the mustBeCompiled may be true
    //       while canBeCompiled is false; remove assert
    // assert(CompilationPolicy::canBeCompiled(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,
                                  methodHandle(), 0, "mustBeCompiled", 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,
      vmSymbolHandles::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, symbolHandle name, symbolHandle signature, TRAPS) {
  methodOop result_oop = klass->uncached_lookup_method(name(), signature());
  result = methodHandle(THREAD, result_oop);
}

// returns first instance method
void LinkResolver::lookup_instance_method_in_klasses(methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle 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, symbolHandle name, symbolHandle 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, symbolHandle name, symbolHandle 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, symbolHandle name, symbolHandle signature, TRAPS) {
  if (EnableMethodHandles && MethodHandles::enabled() &&
      name == vmSymbolHandles::invoke_name() && klass() == SystemDictionary::MethodHandle_klass()) {
    methodOop result_oop = SystemDictionary::find_method_handle_invoke(signature,
                                                                       Handle(),
                                                                       Handle(),
                                                                       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,
      vmSymbolHandles::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);

  symbolHandle method_name      (THREAD, pool->name_ref_at(index));
  symbolHandle method_signature (THREAD, 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.dyn.MethodHandle
  resolved_klass = SystemDictionaryHandles::MethodHandle_klass();

  symbolHandle method_name = vmSymbolHandles::invoke_name();

  symbolHandle method_signature(THREAD, 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);
  symbolHandle method_name      (THREAD, pool->name_ref_at(index));
  symbolHandle method_signature (THREAD, 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,
                                  symbolHandle method_name, symbolHandle method_signature,
                                  KlassHandle current_klass, bool check_access, TRAPS) {

  // 1. check if klass is not interface
  if (resolved_klass->is_interface()) {
    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, 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,
                                            symbolHandle method_name,
                                            symbolHandle method_signature,
                                            KlassHandle current_klass,
                                            bool check_access, TRAPS) {

 // check if klass is interface
  if (!resolved_klass->is_interface()) {
    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,
      vmSymbolHandles::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
  symbolOop field = pool->name_ref_at(index);
  symbolHandle field_h (THREAD, field); // preserve in case we need the name
  symbolOop 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()) {
    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());
    symbolHandle signature_ref (THREAD, 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_h()->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());
  symbolHandle name  (THREAD, 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, symbolHandle method_name,
                                       symbolHandle 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,
                                                  symbolHandle method_name, symbolHandle 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()) {
    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, symbolHandle method_name,
                                        symbolHandle 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,
                                                   symbolHandle method_name, symbolHandle 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 <init>, 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,
      vmSymbolHandles::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()) {
    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 <init>
        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,
                           symbolHandle(THREAD, resolved_method->name()),
                           symbolHandle(THREAD, 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()) {
    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,
                                        symbolHandle method_name, symbolHandle 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,
                                                   symbolHandle method_name, symbolHandle 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()) {
    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,
                           symbolHandle(THREAD, resolved_method->name()),
                           symbolHandle(THREAD, 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,
                                          symbolHandle method_name, symbolHandle 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, symbolHandle method_name,
                                                     symbolHandle 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())) {
    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,
            symbolHandle(THREAD, resolved_method->name()),
            symbolHandle(THREAD, 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,
                                                 symbolHandle method_name,
                                                 symbolHandle 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,
                                                 symbolHandle method_name,
                                                 symbolHandle 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,
                                                 symbolHandle name,
                                                 symbolHandle 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,
                                                 symbolHandle name,
                                                 symbolHandle 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,
                                               symbolHandle name,
                                               symbolHandle 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,
                                                  symbolHandle name,
                                                  symbolHandle 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, symbolHandle name, symbolHandle 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, symbolHandle& method_name, symbolHandle& 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      = symbolHandle(THREAD, pool->name_ref_at(index));
  method_signature = symbolHandle(THREAD, 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;
  symbolHandle method_name;
  symbolHandle method_signature;
  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;
  symbolHandle method_name;
  symbolHandle method_signature;
  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;
  symbolHandle method_name;
  symbolHandle method_signature;
  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;
  symbolHandle method_name;
  symbolHandle method_signature;
  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.
  symbolHandle method_signature(THREAD, pool->signature_ref_at(raw_index));  // raw_index works directly
  symbolHandle method_name = vmSymbolHandles::invoke_name();
  KlassHandle resolved_klass = SystemDictionaryHandles::MethodHandle_klass();

  // JSR 292:  this must be an implicitly generated method MethodHandle.invoke(*...)
  // The extra MH receiver will be inserted into the stack on every call.
  methodHandle resolved_method;
  lookup_implicit_method(resolved_method, resolved_klass, method_name, method_signature, CHECK);
  if (resolved_method.is_null()) {
    THROW(vmSymbols::java_lang_InternalError());
  }
  result.set_virtual(resolved_klass, KlassHandle(), resolved_method, resolved_method, resolved_method->vtable_index(), CHECK);
}

//------------------------------------------------------------------------------------------------------------------------
#ifndef PRODUCT

void FieldAccessInfo::print() {
  ResourceMark rm;
  tty->print_cr("Field %s@%d", name()->as_C_string(), field_offset());
}

#endif