never@1445: /*
stefank@2314:  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
twisti@2762:  * Copyright 2009, 2010, 2011 Red Hat, Inc.
never@1445:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@1445:  *
never@1445:  * This code is free software; you can redistribute it and/or modify it
never@1445:  * under the terms of the GNU General Public License version 2 only, as
never@1445:  * published by the Free Software Foundation.
never@1445:  *
never@1445:  * This code is distributed in the hope that it will be useful, but WITHOUT
never@1445:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@1445:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
never@1445:  * version 2 for more details (a copy is included in the LICENSE file that
never@1445:  * accompanied this code).
never@1445:  *
never@1445:  * You should have received a copy of the GNU General Public License version
never@1445:  * 2 along with this work; if not, write to the Free Software Foundation,
never@1445:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@1445:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
never@1445:  *
never@1445:  */
never@1445: 
stefank@2314: #include "precompiled.hpp"
twisti@4237: #include "interpreter/interpreterGenerator.hpp"
stefank@2314: #include "interpreter/interpreter.hpp"
stefank@2314: #include "memory/allocation.inline.hpp"
stefank@2314: #include "prims/methodHandles.hpp"
twisti@1781: 
twisti@4237: void MethodHandles::invoke_target(Method* method, TRAPS) {
twisti@4237: 
twisti@4237:   JavaThread *thread = (JavaThread *) THREAD;
twisti@4237:   ZeroStack *stack = thread->zero_stack();
twisti@4237:   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
twisti@4237:   interpreterState istate = frame->interpreter_state();
twisti@4237: 
twisti@4237:   // Trim back the stack to put the parameters at the top
twisti@4237:   stack->set_sp(istate->stack() + 1);
twisti@4237: 
twisti@4237:   Interpreter::invoke_method(method, method->from_interpreted_entry(), THREAD);
twisti@4237: 
twisti@4237:   // Convert the result
twisti@4237:   istate->set_stack(stack->sp() - 1);
twisti@4237: 
twisti@1865: }
twisti@1865: 
twisti@4237: oop MethodHandles::popFromStack(TRAPS) {
twisti@4237: 
twisti@4237:   JavaThread *thread = (JavaThread *) THREAD;
twisti@4237:   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
twisti@4237:   interpreterState istate = frame->interpreter_state();
twisti@4237:   intptr_t* topOfStack = istate->stack();
twisti@4237: 
twisti@4237:   oop top = STACK_OBJECT(-1);
twisti@4237:   MORE_STACK(-1);
twisti@4237:   istate->set_stack(topOfStack);
twisti@4237: 
twisti@4237:   return top;
twisti@4237: 
twisti@1781: }
twisti@4237: 
twisti@4237: int MethodHandles::method_handle_entry_invokeBasic(Method* method, intptr_t UNUSED, TRAPS) {
twisti@4237: 
twisti@4237:   JavaThread *thread = (JavaThread *) THREAD;
twisti@4237:   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
twisti@4237:   interpreterState istate = frame->interpreter_state();
twisti@4237:   intptr_t* topOfStack = istate->stack();
twisti@4237: 
twisti@4237:   // 'this' is a MethodHandle. We resolve the target method by accessing this.form.vmentry.vmtarget.
twisti@4237:   int numArgs = method->size_of_parameters();
twisti@4237:   oop lform1 = java_lang_invoke_MethodHandle::form(STACK_OBJECT(-numArgs)); // this.form
twisti@4237:   oop vmEntry1 = java_lang_invoke_LambdaForm::vmentry(lform1);
twisti@4237:   Method* vmtarget = (Method*) java_lang_invoke_MemberName::vmtarget(vmEntry1);
twisti@4237: 
twisti@4237:   invoke_target(vmtarget, THREAD);
twisti@4237: 
twisti@4237:   // No deoptimized frames on the stack
twisti@4237:   return 0;
twisti@4237: }
twisti@4237: 
twisti@4237: int MethodHandles::method_handle_entry_linkToStaticOrSpecial(Method* method, intptr_t UNUSED, TRAPS) {
twisti@4237: 
twisti@4237:   // Pop appendix argument from stack. This is a MemberName which we resolve to the
twisti@4237:   // target method.
twisti@4237:   oop vmentry = popFromStack(THREAD);
twisti@4237: 
twisti@4237:   Method* vmtarget = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);
twisti@4237: 
twisti@4237:   invoke_target(vmtarget, THREAD);
twisti@4237: 
twisti@4237:   return 0;
twisti@4237: }
twisti@4237: 
twisti@4237: int MethodHandles::method_handle_entry_linkToInterface(Method* method, intptr_t UNUSED, TRAPS) {
twisti@4237:   JavaThread *thread = (JavaThread *) THREAD;
twisti@4237:   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
twisti@4237:   interpreterState istate = frame->interpreter_state();
twisti@4237: 
twisti@4237:   // Pop appendix argument from stack. This is a MemberName which we resolve to the
twisti@4237:   // target method.
twisti@4237:   oop vmentry = popFromStack(THREAD);
twisti@4237:   intptr_t* topOfStack = istate->stack();
twisti@4237: 
twisti@4237:   // Resolve target method by looking up in the receiver object's itable.
twisti@4237:   Klass* clazz = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(vmentry));
twisti@4237:   intptr_t vmindex = java_lang_invoke_MemberName::vmindex(vmentry);
twisti@4237:   Method* target = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);
twisti@4237: 
twisti@4237:   int numArgs = target->size_of_parameters();
twisti@4237:   oop recv = STACK_OBJECT(-numArgs);
twisti@4237: 
twisti@4237:   InstanceKlass* klass_part = InstanceKlass::cast(recv->klass());
twisti@4237:   itableOffsetEntry* ki = (itableOffsetEntry*) klass_part->start_of_itable();
twisti@4237:   int i;
twisti@4237:   for ( i = 0 ; i < klass_part->itable_length() ; i++, ki++ ) {
twisti@4237:     if (ki->interface_klass() == clazz) break;
twisti@4237:   }
twisti@4237: 
twisti@4237:   itableMethodEntry* im = ki->first_method_entry(recv->klass());
twisti@4237:   Method* vmtarget = im[vmindex].method();
twisti@4237: 
twisti@4237:   invoke_target(vmtarget, THREAD);
twisti@4237: 
twisti@4237:   return 0;
twisti@4237: }
twisti@4237: 
twisti@4237: int MethodHandles::method_handle_entry_linkToVirtual(Method* method, intptr_t UNUSED, TRAPS) {
twisti@4237:   JavaThread *thread = (JavaThread *) THREAD;
twisti@4237: 
twisti@4237:   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
twisti@4237:   interpreterState istate = frame->interpreter_state();
twisti@4237: 
twisti@4237:   // Pop appendix argument from stack. This is a MemberName which we resolve to the
twisti@4237:   // target method.
twisti@4237:   oop vmentry = popFromStack(THREAD);
twisti@4237:   intptr_t* topOfStack = istate->stack();
twisti@4237: 
twisti@4237:   // Resolve target method by looking up in the receiver object's vtable.
twisti@4237:   intptr_t vmindex = java_lang_invoke_MemberName::vmindex(vmentry);
twisti@4237:   Method* target = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);
twisti@4237:   int numArgs = target->size_of_parameters();
twisti@4237:   oop recv = STACK_OBJECT(-numArgs);
twisti@4237:   Klass* clazz = recv->klass();
twisti@4237:   Klass* klass_part = InstanceKlass::cast(clazz);
twisti@4237:   klassVtable* vtable = klass_part->vtable();
twisti@4237:   Method* vmtarget = vtable->method_at(vmindex);
twisti@4237: 
twisti@4237:   invoke_target(vmtarget, THREAD);
twisti@4237: 
twisti@4237:   return 0;
twisti@4237: }
twisti@4237: 
twisti@4237: int MethodHandles::method_handle_entry_invalid(Method* method, intptr_t UNUSED, TRAPS) {
twisti@4237:   ShouldNotReachHere();
twisti@4237:   return 0;
twisti@4237: }
twisti@4237: 
twisti@4237: address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* masm,
twisti@4237:                                                                 vmIntrinsics::ID iid) {
twisti@4237:   switch (iid) {
twisti@4237:   case vmIntrinsics::_invokeGeneric:
twisti@4237:   case vmIntrinsics::_compiledLambdaForm:
twisti@4237:     // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
twisti@4237:     // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
twisti@4237:     // They all allow an appendix argument.
twisti@4237:     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_invalid);
twisti@4237:   case vmIntrinsics::_invokeBasic:
twisti@4237:     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_invokeBasic);
twisti@4237:   case vmIntrinsics::_linkToStatic:
twisti@4237:   case vmIntrinsics::_linkToSpecial:
twisti@4237:     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToStaticOrSpecial);
twisti@4237:   case vmIntrinsics::_linkToInterface:
twisti@4237:     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToInterface);
twisti@4237:   case vmIntrinsics::_linkToVirtual:
twisti@4237:     return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToVirtual);
twisti@4237:   default:
twisti@4237:     ShouldNotReachHere();
twisti@4237:     return NULL;
twisti@4237:   }
twisti@4237: }