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 /*

  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2009, 2010, 2011 Red Hat, Inc.

  * 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 "interpreter/interpreterGenerator.hpp"

 #include "interpreter/interpreter.hpp"

 #include "memory/allocation.inline.hpp"

 #include "prims/methodHandles.hpp"

 void MethodHandles::invoke_target(Method* method, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();

   interpreterState istate = frame->interpreter_state();

   // Trim back the stack to put the parameters at the top

   stack->set_sp(istate->stack() + 1);

   Interpreter::invoke_method(method, method->from_interpreted_entry(), THREAD);

   // Convert the result

   istate->set_stack(stack->sp() - 1);

 }

 oop MethodHandles::popFromStack(TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();

   interpreterState istate = frame->interpreter_state();

   intptr_t* topOfStack = istate->stack();

   oop top = STACK_OBJECT(-1);

   MORE_STACK(-1);

   istate->set_stack(topOfStack);

   return top;

 }

 int MethodHandles::method_handle_entry_invokeBasic(Method* method, intptr_t UNUSED, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();

   interpreterState istate = frame->interpreter_state();

   intptr_t* topOfStack = istate->stack();

   // 'this' is a MethodHandle. We resolve the target method by accessing this.form.vmentry.vmtarget.

   int numArgs = method->size_of_parameters();

   oop lform1 = java_lang_invoke_MethodHandle::form(STACK_OBJECT(-numArgs)); // this.form

   oop vmEntry1 = java_lang_invoke_LambdaForm::vmentry(lform1);

   Method* vmtarget = (Method*) java_lang_invoke_MemberName::vmtarget(vmEntry1);

   invoke_target(vmtarget, THREAD);

   // No deoptimized frames on the stack

   return 0;

 }

 int MethodHandles::method_handle_entry_linkToStaticOrSpecial(Method* method, intptr_t UNUSED, TRAPS) {

   // Pop appendix argument from stack. This is a MemberName which we resolve to the

   // target method.

   oop vmentry = popFromStack(THREAD);

   Method* vmtarget = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);

   invoke_target(vmtarget, THREAD);

   return 0;

 }

 int MethodHandles::method_handle_entry_linkToInterface(Method* method, intptr_t UNUSED, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();

   interpreterState istate = frame->interpreter_state();

   // Pop appendix argument from stack. This is a MemberName which we resolve to the

   // target method.

   oop vmentry = popFromStack(THREAD);

   intptr_t* topOfStack = istate->stack();

   // Resolve target method by looking up in the receiver object's itable.

   Klass* clazz = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(vmentry));

   intptr_t vmindex = java_lang_invoke_MemberName::vmindex(vmentry);

   Method* target = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);

   int numArgs = target->size_of_parameters();

   oop recv = STACK_OBJECT(-numArgs);

   InstanceKlass* klass_part = InstanceKlass::cast(recv->klass());

   itableOffsetEntry* ki = (itableOffsetEntry*) klass_part->start_of_itable();

   int i;

   for ( i = 0 ; i < klass_part->itable_length() ; i++, ki++ ) {

     if (ki->interface_klass() == clazz) break;

   }

   itableMethodEntry* im = ki->first_method_entry(recv->klass());

   Method* vmtarget = im[vmindex].method();

   invoke_target(vmtarget, THREAD);

   return 0;

 }

 int MethodHandles::method_handle_entry_linkToVirtual(Method* method, intptr_t UNUSED, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();

   interpreterState istate = frame->interpreter_state();

   // Pop appendix argument from stack. This is a MemberName which we resolve to the

   // target method.

   oop vmentry = popFromStack(THREAD);

   intptr_t* topOfStack = istate->stack();

   // Resolve target method by looking up in the receiver object's vtable.

   intptr_t vmindex = java_lang_invoke_MemberName::vmindex(vmentry);

   Method* target = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);

   int numArgs = target->size_of_parameters();

   oop recv = STACK_OBJECT(-numArgs);

   Klass* clazz = recv->klass();

   Klass* klass_part = InstanceKlass::cast(clazz);

   klassVtable* vtable = klass_part->vtable();

   Method* vmtarget = vtable->method_at(vmindex);

   invoke_target(vmtarget, THREAD);

   return 0;

 }

 int MethodHandles::method_handle_entry_invalid(Method* method, intptr_t UNUSED, TRAPS) {

   ShouldNotReachHere();

   return 0;

 }

 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* masm,

                                                                 vmIntrinsics::ID iid) {

   switch (iid) {

   case vmIntrinsics::_invokeGeneric:

   case vmIntrinsics::_compiledLambdaForm:

     // Perhaps surprisingly, the symbolic references visible to Java are not directly used.

     // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.

     // They all allow an appendix argument.

     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_invalid);

   case vmIntrinsics::_invokeBasic:

     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_invokeBasic);

   case vmIntrinsics::_linkToStatic:

   case vmIntrinsics::_linkToSpecial:

     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToStaticOrSpecial);

   case vmIntrinsics::_linkToInterface:

     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToInterface);

   case vmIntrinsics::_linkToVirtual:

     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToVirtual);

   default:

     ShouldNotReachHere();

     return NULL;

   }

 }