1/* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2009, 2010, 2011 Red Hat, Inc. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26#include "precompiled.hpp" 27#include "interpreter/cppInterpreterGenerator.hpp" 28#include "interpreter/interpreter.hpp" 29#include "memory/allocation.inline.hpp" 30#include "memory/resourceArea.hpp" 31#include "oops/oop.inline.hpp" 32#include "prims/methodHandles.hpp" 33 34void MethodHandles::invoke_target(Method* method, TRAPS) { 35 36 JavaThread *thread = (JavaThread *) THREAD; 37 ZeroStack *stack = thread->zero_stack(); 38 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame(); 39 interpreterState istate = frame->interpreter_state(); 40 41 // Trim back the stack to put the parameters at the top 42 stack->set_sp(istate->stack() + 1); 43 44 Interpreter::invoke_method(method, method->from_interpreted_entry(), THREAD); 45 46 // Convert the result 47 istate->set_stack(stack->sp() - 1); 48 49} 50 51oop MethodHandles::popFromStack(TRAPS) { 52 53 JavaThread *thread = (JavaThread *) THREAD; 54 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame(); 55 interpreterState istate = frame->interpreter_state(); 56 intptr_t* topOfStack = istate->stack(); 57 58 oop top = STACK_OBJECT(-1); 59 MORE_STACK(-1); 60 istate->set_stack(topOfStack); 61 62 return top; 63 64} 65 66int MethodHandles::method_handle_entry_invokeBasic(Method* method, intptr_t UNUSED, TRAPS) { 67 68 JavaThread *thread = (JavaThread *) THREAD; 69 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame(); 70 interpreterState istate = frame->interpreter_state(); 71 intptr_t* topOfStack = istate->stack(); 72 73 // 'this' is a MethodHandle. We resolve the target method by accessing this.form.vmentry.vmtarget. 74 int numArgs = method->size_of_parameters(); 75 oop lform1 = java_lang_invoke_MethodHandle::form(STACK_OBJECT(-numArgs)); // this.form 76 oop vmEntry1 = java_lang_invoke_LambdaForm::vmentry(lform1); 77 Method* vmtarget = (Method*) java_lang_invoke_MemberName::vmtarget(vmEntry1); 78 79 invoke_target(vmtarget, THREAD); 80 81 // No deoptimized frames on the stack 82 return 0; 83} 84 85int MethodHandles::method_handle_entry_linkToStaticOrSpecial(Method* method, intptr_t UNUSED, TRAPS) { 86 87 // Pop appendix argument from stack. This is a MemberName which we resolve to the 88 // target method. 89 oop vmentry = popFromStack(THREAD); 90 91 Method* vmtarget = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry); 92 93 invoke_target(vmtarget, THREAD); 94 95 return 0; 96} 97 98int MethodHandles::method_handle_entry_linkToInterface(Method* method, intptr_t UNUSED, TRAPS) { 99 JavaThread *thread = (JavaThread *) THREAD; 100 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame(); 101 interpreterState istate = frame->interpreter_state(); 102 103 // Pop appendix argument from stack. This is a MemberName which we resolve to the 104 // target method. 105 oop vmentry = popFromStack(THREAD); 106 intptr_t* topOfStack = istate->stack(); 107 108 // Resolve target method by looking up in the receiver object's itable. 109 Klass* clazz = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(vmentry)); 110 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(vmentry); 111 Method* target = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry); 112 113 int numArgs = target->size_of_parameters(); 114 oop recv = STACK_OBJECT(-numArgs); 115 116 InstanceKlass* klass_part = InstanceKlass::cast(recv->klass()); 117 itableOffsetEntry* ki = (itableOffsetEntry*) klass_part->start_of_itable(); 118 int i; 119 for ( i = 0 ; i < klass_part->itable_length() ; i++, ki++ ) { 120 if (ki->interface_klass() == clazz) break; 121 } 122 123 itableMethodEntry* im = ki->first_method_entry(recv->klass()); 124 Method* vmtarget = im[vmindex].method(); 125 126 invoke_target(vmtarget, THREAD); 127 128 return 0; 129} 130 131int MethodHandles::method_handle_entry_linkToVirtual(Method* method, intptr_t UNUSED, TRAPS) { 132 JavaThread *thread = (JavaThread *) THREAD; 133 134 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame(); 135 interpreterState istate = frame->interpreter_state(); 136 137 // Pop appendix argument from stack. This is a MemberName which we resolve to the 138 // target method. 139 oop vmentry = popFromStack(THREAD); 140 intptr_t* topOfStack = istate->stack(); 141 142 // Resolve target method by looking up in the receiver object's vtable. 143 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(vmentry); 144 Method* target = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry); 145 int numArgs = target->size_of_parameters(); 146 oop recv = STACK_OBJECT(-numArgs); 147 Klass* clazz = recv->klass(); 148 Klass* klass_part = InstanceKlass::cast(clazz); 149 ResourceMark rm(THREAD); 150 klassVtable* vtable = klass_part->vtable(); 151 Method* vmtarget = vtable->method_at(vmindex); 152 153 invoke_target(vmtarget, THREAD); 154 155 return 0; 156} 157 158int MethodHandles::method_handle_entry_invalid(Method* method, intptr_t UNUSED, TRAPS) { 159 ShouldNotReachHere(); 160 return 0; 161} 162 163address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* masm, 164 vmIntrinsics::ID iid) { 165 switch (iid) { 166 case vmIntrinsics::_invokeGeneric: 167 case vmIntrinsics::_compiledLambdaForm: 168 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 169 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 170 // They all allow an appendix argument. 171 return CppInterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_invalid); 172 case vmIntrinsics::_invokeBasic: 173 return CppInterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_invokeBasic); 174 case vmIntrinsics::_linkToStatic: 175 case vmIntrinsics::_linkToSpecial: 176 return CppInterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToStaticOrSpecial); 177 case vmIntrinsics::_linkToInterface: 178 return CppInterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToInterface); 179 case vmIntrinsics::_linkToVirtual: 180 return CppInterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToVirtual); 181 default: 182 ShouldNotReachHere(); 183 return NULL; 184 } 185} 186