1 /*
2 * Copyright (c) 1997, 2015, 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/interpreterGenerator.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "prims/methodHandles.hpp"
31
32 void MethodHandles::invoke_target(Method* method, TRAPS) {
33
34 JavaThread *thread = (JavaThread *) THREAD;
35 ZeroStack *stack = thread->zero_stack();
36 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
37 interpreterState istate = frame->interpreter_state();
38
39 // Trim back the stack to put the parameters at the top
40 stack->set_sp(istate->stack() + 1);
41
42 Interpreter::invoke_method(method, method->from_interpreted_entry(), THREAD);
43
44 // Convert the result
45 istate->set_stack(stack->sp() - 1);
46
47 }
48
49 oop MethodHandles::popFromStack(TRAPS) {
50
51 JavaThread *thread = (JavaThread *) THREAD;
52 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
53 interpreterState istate = frame->interpreter_state();
54 intptr_t* topOfStack = istate->stack();
55
56 oop top = STACK_OBJECT(-1);
57 MORE_STACK(-1);
58 istate->set_stack(topOfStack);
59
60 return top;
61
62 }
63
64 int MethodHandles::method_handle_entry_invokeBasic(Method* method, intptr_t UNUSED, TRAPS) {
65
66 JavaThread *thread = (JavaThread *) THREAD;
67 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
68 interpreterState istate = frame->interpreter_state();
69 intptr_t* topOfStack = istate->stack();
70
71 // 'this' is a MethodHandle. We resolve the target method by accessing this.form.vmentry.vmtarget.
72 int numArgs = method->size_of_parameters();
73 oop lform1 = java_lang_invoke_MethodHandle::form(STACK_OBJECT(-numArgs)); // this.form
74 oop vmEntry1 = java_lang_invoke_LambdaForm::vmentry(lform1);
75 Method* vmtarget = (Method*) java_lang_invoke_MemberName::vmtarget(vmEntry1);
76
77 invoke_target(vmtarget, THREAD);
78
79 // No deoptimized frames on the stack
80 return 0;
81 }
82
83 int MethodHandles::method_handle_entry_linkToStaticOrSpecial(Method* method, intptr_t UNUSED, TRAPS) {
84
85 // Pop appendix argument from stack. This is a MemberName which we resolve to the
86 // target method.
87 oop vmentry = popFromStack(THREAD);
88
89 Method* vmtarget = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);
90
91 invoke_target(vmtarget, THREAD);
92
93 return 0;
94 }
95
96 int MethodHandles::method_handle_entry_linkToInterface(Method* method, intptr_t UNUSED, TRAPS) {
97 JavaThread *thread = (JavaThread *) THREAD;
98 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
99 interpreterState istate = frame->interpreter_state();
100
101 // Pop appendix argument from stack. This is a MemberName which we resolve to the
102 // target method.
103 oop vmentry = popFromStack(THREAD);
104 intptr_t* topOfStack = istate->stack();
105
106 // Resolve target method by looking up in the receiver object's itable.
107 Klass* clazz = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(vmentry));
108 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(vmentry);
109 Method* target = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);
110
111 int numArgs = target->size_of_parameters();
112 oop recv = STACK_OBJECT(-numArgs);
113
114 InstanceKlass* klass_part = InstanceKlass::cast(recv->klass());
115 itableOffsetEntry* ki = (itableOffsetEntry*) klass_part->start_of_itable();
116 int i;
117 for ( i = 0 ; i < klass_part->itable_length() ; i++, ki++ ) {
118 if (ki->interface_klass() == clazz) break;
119 }
120
121 itableMethodEntry* im = ki->first_method_entry(recv->klass());
122 Method* vmtarget = im[vmindex].method();
123
124 invoke_target(vmtarget, THREAD);
125
126 return 0;
127 }
128
129 int MethodHandles::method_handle_entry_linkToVirtual(Method* method, intptr_t UNUSED, TRAPS) {
130 JavaThread *thread = (JavaThread *) THREAD;
131
132 InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
133 interpreterState istate = frame->interpreter_state();
134
135 // Pop appendix argument from stack. This is a MemberName which we resolve to the
136 // target method.
137 oop vmentry = popFromStack(THREAD);
138 intptr_t* topOfStack = istate->stack();
139
140 // Resolve target method by looking up in the receiver object's vtable.
141 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(vmentry);
142 Method* target = (Method*) java_lang_invoke_MemberName::vmtarget(vmentry);
143 int numArgs = target->size_of_parameters();
144 oop recv = STACK_OBJECT(-numArgs);
145 Klass* clazz = recv->klass();
146 Klass* klass_part = InstanceKlass::cast(clazz);
147 ResourceMark rm(THREAD);
148 klassVtable* vtable = klass_part->vtable();
149 Method* vmtarget = vtable->method_at(vmindex);
150
151 invoke_target(vmtarget, THREAD);
152
153 return 0;
154 }
155
156 int MethodHandles::method_handle_entry_invalid(Method* method, intptr_t UNUSED, TRAPS) {
157 ShouldNotReachHere();
158 return 0;
159 }
160
161 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* masm,
162 vmIntrinsics::ID iid) {
163 switch (iid) {
164 case vmIntrinsics::_invokeGeneric:
165 case vmIntrinsics::_compiledLambdaForm:
166 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
167 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
168 // They all allow an appendix argument.
169 return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_invalid);
170 case vmIntrinsics::_invokeBasic:
171 return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_invokeBasic);
172 case vmIntrinsics::_linkToStatic:
173 case vmIntrinsics::_linkToSpecial:
174 return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToStaticOrSpecial);
175 case vmIntrinsics::_linkToInterface:
176 return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToInterface);
177 case vmIntrinsics::_linkToVirtual:
178 return InterpreterGenerator::generate_entry_impl(masm, (address) MethodHandles::method_handle_entry_linkToVirtual);
179 default:
180 ShouldNotReachHere();
181 return NULL;
182 }
183 }