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
34 void 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
51 oop 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
66 int 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
85 int 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
98 int 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
131 int 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
158 int MethodHandles::method_handle_entry_invalid(Method* method, intptr_t UNUSED, TRAPS) {
159 ShouldNotReachHere();
160 return 0;
161 }
162
163 address 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 }