1 /*
2 * Copyright 2008-2010 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 /*
26 * JSR 292 reference implementation: method handle structure analysis
27 */
28
29 #include "incls/_precompiled.incl"
30 #include "incls/_methodHandleWalk.cpp.incl"
31
32
33 // -----------------------------------------------------------------------------
34 // MethodHandleChain
35
36 void MethodHandleChain::set_method_handle(Handle mh, TRAPS) {
37 if (!java_dyn_MethodHandle::is_instance(mh())) lose("bad method handle", CHECK);
38
39 // set current method handle and unpack partially
40 _method_handle = mh;
41 _is_last = false;
42 _is_bound = false;
43 _arg_slot = -1;
44 _arg_type = T_VOID;
45 _conversion = -1;
46 _last_invoke = Bytecodes::_nop; //arbitrary non-garbage
47
48 if (sun_dyn_DirectMethodHandle::is_instance(mh())) {
49 set_last_method(mh(), THREAD);
50 return;
51 }
52 if (sun_dyn_AdapterMethodHandle::is_instance(mh())) {
53 _conversion = AdapterMethodHandle_conversion();
54 assert(_conversion != -1, "bad conv value");
55 assert(sun_dyn_BoundMethodHandle::is_instance(mh()), "also BMH");
56 }
57 if (sun_dyn_BoundMethodHandle::is_instance(mh())) {
58 if (!is_adapter()) // keep AMH and BMH separate in this model
59 _is_bound = true;
60 _arg_slot = BoundMethodHandle_vmargslot();
61 oop target = MethodHandle_vmtarget_oop();
62 if (!is_bound() || java_dyn_MethodHandle::is_instance(target)) {
63 _arg_type = compute_bound_arg_type(target, NULL, _arg_slot, CHECK);
64 } else if (target != NULL && target->is_method()) {
65 methodOop m = (methodOop) target;
66 _arg_type = compute_bound_arg_type(NULL, m, _arg_slot, CHECK);
67 set_last_method(mh(), CHECK);
68 } else {
69 _is_bound = false; // lose!
70 }
71 }
72 if (is_bound() && _arg_type == T_VOID) {
73 lose("bad vmargslot", CHECK);
74 }
75 if (!is_bound() && !is_adapter()) {
76 lose("unrecognized MH type", CHECK);
77 }
78 }
79
80
81 void MethodHandleChain::set_last_method(oop target, TRAPS) {
82 _is_last = true;
83 klassOop receiver_limit_oop = NULL;
84 int flags = 0;
85 methodOop m = MethodHandles::decode_method(target, receiver_limit_oop, flags);
86 _last_method = methodHandle(THREAD, m);
87 if ((flags & MethodHandles::_dmf_has_receiver) == 0)
88 _last_invoke = Bytecodes::_invokestatic;
89 else if ((flags & MethodHandles::_dmf_does_dispatch) == 0)
90 _last_invoke = Bytecodes::_invokespecial;
91 else if ((flags & MethodHandles::_dmf_from_interface) != 0)
92 _last_invoke = Bytecodes::_invokeinterface;
93 else
94 _last_invoke = Bytecodes::_invokevirtual;
95 }
96
97
98 BasicType MethodHandleChain::compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS) {
99 // There is no direct indication of whether the argument is primitive or not.
100 // It is implied by the _vmentry code, and by the MethodType of the target.
101 // FIXME: Make it explicit MethodHandleImpl refactors out from MethodHandle
102 BasicType arg_type = T_VOID;
103 if (target != NULL) {
104 oop mtype = java_dyn_MethodHandle::type(target);
105 int arg_num = MethodHandles::argument_slot_to_argnum(mtype, arg_slot);
106 if (arg_num >= 0) {
107 oop ptype = java_dyn_MethodType::ptype(mtype, arg_num);
108 arg_type = java_lang_Class::as_BasicType(ptype);
109 }
110 } else if (m != NULL) {
111 // figure out the argument type from the slot
112 // FIXME: make this explicit in the MH
113 int cur_slot = m->size_of_parameters();
114 if (arg_slot >= cur_slot)
115 return T_VOID;
116 if (!m->is_static()) {
117 cur_slot -= type2size[T_OBJECT];
118 if (cur_slot == arg_slot)
119 return T_OBJECT;
120 }
121 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
122 BasicType bt = ss.type();
123 cur_slot -= type2size[bt];
124 if (cur_slot <= arg_slot) {
125 if (cur_slot == arg_slot)
126 arg_type = bt;
127 break;
128 }
129 }
130 }
131 if (arg_type == T_ARRAY)
132 arg_type = T_OBJECT;
133 return arg_type;
134 }
135
136
137 void MethodHandleChain::lose(const char* msg, TRAPS) {
138 assert(false, "lose");
139 _lose_message = msg;
140 if (!THREAD->is_Java_thread() || ((JavaThread*)THREAD)->thread_state() != _thread_in_vm) {
141 // throw a preallocated exception
142 THROW_OOP(Universe::virtual_machine_error_instance());
143 }
144 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
145 }
146
147
148 // -----------------------------------------------------------------------------
149 // MethodHandleWalker
150
151 Bytecodes::Code MethodHandleWalker::conversion_code(BasicType src, BasicType dest) {
152 if (is_subword_type(src)) {
153 src = T_INT; // all subword src types act like int
154 }
155 if (src == dest) {
156 return Bytecodes::_nop;
157 }
158
159 #define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d))
160 switch (SRC_DEST(src, dest)) {
161 case SRC_DEST(T_INT, T_LONG): return Bytecodes::_i2l;
162 case SRC_DEST(T_INT, T_FLOAT): return Bytecodes::_i2f;
163 case SRC_DEST(T_INT, T_DOUBLE): return Bytecodes::_i2d;
164 case SRC_DEST(T_INT, T_BYTE): return Bytecodes::_i2b;
165 case SRC_DEST(T_INT, T_CHAR): return Bytecodes::_i2c;
166 case SRC_DEST(T_INT, T_SHORT): return Bytecodes::_i2s;
167
168 case SRC_DEST(T_LONG, T_INT): return Bytecodes::_l2i;
169 case SRC_DEST(T_LONG, T_FLOAT): return Bytecodes::_l2f;
170 case SRC_DEST(T_LONG, T_DOUBLE): return Bytecodes::_l2d;
171
172 case SRC_DEST(T_FLOAT, T_INT): return Bytecodes::_f2i;
173 case SRC_DEST(T_FLOAT, T_LONG): return Bytecodes::_f2l;
174 case SRC_DEST(T_FLOAT, T_DOUBLE): return Bytecodes::_f2d;
175
176 case SRC_DEST(T_DOUBLE, T_INT): return Bytecodes::_d2i;
177 case SRC_DEST(T_DOUBLE, T_LONG): return Bytecodes::_d2l;
178 case SRC_DEST(T_DOUBLE, T_FLOAT): return Bytecodes::_d2f;
179 }
180 #undef SRC_DEST
181
182 // cannot do it in one step, or at all
183 return Bytecodes::_illegal;
184 }
185
186
187 // -----------------------------------------------------------------------------
188 // MethodHandleWalker::walk
189 //
190 MethodHandleWalker::ArgToken
191 MethodHandleWalker::walk(TRAPS) {
192 ArgToken empty = ArgToken(); // Empty return value.
193
194 walk_incoming_state(CHECK_(empty));
195
196 for (;;) {
197 set_method_handle(chain().method_handle_oop());
198
199 assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
200
201 if (chain().is_adapter()) {
202 int conv_op = chain().adapter_conversion_op();
203 int arg_slot = chain().adapter_arg_slot();
204 SlotState* arg_state = slot_state(arg_slot);
205 if (arg_state == NULL
206 && conv_op > sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW) {
207 lose("bad argument index", CHECK_(empty));
208 }
209
210 // perform the adapter action
211 switch (chain().adapter_conversion_op()) {
212 case sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY:
213 // No changes to arguments; pass the bits through.
214 break;
215
216 case sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW: {
217 // To keep the verifier happy, emit bitwise ("raw") conversions as needed.
218 // See MethodHandles::same_basic_type_for_arguments for allowed conversions.
219 Handle incoming_mtype(THREAD, chain().method_type_oop());
220 oop outgoing_mh_oop = chain().vmtarget_oop();
221 if (!java_dyn_MethodHandle::is_instance(outgoing_mh_oop))
222 lose("outgoing target not a MethodHandle", CHECK_(empty));
223 Handle outgoing_mtype(THREAD, java_dyn_MethodHandle::type(outgoing_mh_oop));
224 outgoing_mh_oop = NULL; // GC safety
225
226 int nptypes = java_dyn_MethodType::ptype_count(outgoing_mtype());
227 if (nptypes != java_dyn_MethodType::ptype_count(incoming_mtype()))
228 lose("incoming and outgoing parameter count do not agree", CHECK_(empty));
229
230 for (int i = 0, slot = _outgoing.length() - 1; slot >= 0; slot--) {
231 SlotState* arg_state = slot_state(slot);
232 if (arg_state->_type == T_VOID) continue;
233 ArgToken arg = _outgoing.at(slot)._arg;
234
235 klassOop in_klass = NULL;
236 klassOop out_klass = NULL;
237 BasicType inpbt = java_lang_Class::as_BasicType(java_dyn_MethodType::ptype(incoming_mtype(), i), &in_klass);
238 BasicType outpbt = java_lang_Class::as_BasicType(java_dyn_MethodType::ptype(outgoing_mtype(), i), &out_klass);
239 assert(inpbt == arg.basic_type(), "sanity");
240
241 if (inpbt != outpbt) {
242 vmIntrinsics::ID iid = vmIntrinsics::for_raw_conversion(inpbt, outpbt);
243 if (iid == vmIntrinsics::_none) {
244 lose("no raw conversion method", CHECK_(empty));
245 }
246 ArgToken arglist[2];
247 arglist[0] = arg; // outgoing 'this'
248 arglist[1] = ArgToken(); // sentinel
249 arg = make_invoke(NULL, iid, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK_(empty));
250 change_argument(inpbt, slot, outpbt, arg);
251 }
252
253 i++; // We need to skip void slots at the top of the loop.
254 }
255
256 BasicType inrbt = java_lang_Class::as_BasicType(java_dyn_MethodType::rtype(incoming_mtype()));
257 BasicType outrbt = java_lang_Class::as_BasicType(java_dyn_MethodType::rtype(outgoing_mtype()));
258 if (inrbt != outrbt) {
259 if (inrbt == T_INT && outrbt == T_VOID) {
260 // See comments in MethodHandles::same_basic_type_for_arguments.
261 } else {
262 assert(false, "IMPLEMENT ME");
263 lose("no raw conversion method", CHECK_(empty));
264 }
265 }
266 break;
267 }
268
269 case sun_dyn_AdapterMethodHandle::OP_CHECK_CAST: {
270 // checkcast the Nth outgoing argument in place
271 klassOop dest_klass = NULL;
272 BasicType dest = java_lang_Class::as_BasicType(chain().adapter_arg_oop(), &dest_klass);
273 assert(dest == T_OBJECT, "");
274 assert(dest == arg_state->_type, "");
275 ArgToken arg = arg_state->_arg;
276 ArgToken new_arg = make_conversion(T_OBJECT, dest_klass, Bytecodes::_checkcast, arg, CHECK_(empty));
277 assert(arg.index() == new_arg.index(), "should be the same index");
278 debug_only(dest_klass = (klassOop)badOop);
279 break;
280 }
281
282 case sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM: {
283 // i2l, etc., on the Nth outgoing argument in place
284 BasicType src = chain().adapter_conversion_src_type(),
285 dest = chain().adapter_conversion_dest_type();
286 Bytecodes::Code bc = conversion_code(src, dest);
287 ArgToken arg = arg_state->_arg;
288 if (bc == Bytecodes::_nop) {
289 break;
290 } else if (bc != Bytecodes::_illegal) {
291 arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
292 } else if (is_subword_type(dest)) {
293 bc = conversion_code(src, T_INT);
294 if (bc != Bytecodes::_illegal) {
295 arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
296 bc = conversion_code(T_INT, dest);
297 arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
298 }
299 }
300 if (bc == Bytecodes::_illegal) {
301 lose("bad primitive conversion", CHECK_(empty));
302 }
303 change_argument(src, arg_slot, dest, arg);
304 break;
305 }
306
307 case sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM: {
308 // checkcast to wrapper type & call intValue, etc.
309 BasicType dest = chain().adapter_conversion_dest_type();
310 ArgToken arg = arg_state->_arg;
311 arg = make_conversion(T_OBJECT, SystemDictionary::box_klass(dest),
312 Bytecodes::_checkcast, arg, CHECK_(empty));
313 vmIntrinsics::ID unboxer = vmIntrinsics::for_unboxing(dest);
314 if (unboxer == vmIntrinsics::_none) {
315 lose("no unboxing method", CHECK_(empty));
316 }
317 ArgToken arglist[2];
318 arglist[0] = arg; // outgoing 'this'
319 arglist[1] = ArgToken(); // sentinel
320 arg = make_invoke(NULL, unboxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_(empty));
321 change_argument(T_OBJECT, arg_slot, dest, arg);
322 break;
323 }
324
325 case sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF: {
326 // call wrapper type.valueOf
327 BasicType src = chain().adapter_conversion_src_type();
328 ArgToken arg = arg_state->_arg;
329 vmIntrinsics::ID boxer = vmIntrinsics::for_boxing(src);
330 if (boxer == vmIntrinsics::_none) {
331 lose("no boxing method", CHECK_(empty));
332 }
333 ArgToken arglist[2];
334 arglist[0] = arg; // outgoing value
335 arglist[1] = ArgToken(); // sentinel
336 assert(false, "I think the argument count must be 1 instead of 0");
337 arg = make_invoke(NULL, boxer, Bytecodes::_invokevirtual, false, 0, &arglist[0], CHECK_(empty));
338 change_argument(src, arg_slot, T_OBJECT, arg);
339 break;
340 }
341
342 case sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS: {
343 int dest_arg_slot = chain().adapter_conversion_vminfo();
344 if (!slot_has_argument(dest_arg_slot)) {
345 lose("bad swap index", CHECK_(empty));
346 }
347 // a simple swap between two arguments
348 SlotState* dest_arg_state = slot_state(dest_arg_slot);
349 SlotState temp = (*dest_arg_state);
350 (*dest_arg_state) = (*arg_state);
351 (*arg_state) = temp;
352 break;
353 }
354
355 case sun_dyn_AdapterMethodHandle::OP_ROT_ARGS: {
356 int dest_arg_slot = chain().adapter_conversion_vminfo();
357 if (!slot_has_argument(dest_arg_slot) || arg_slot == dest_arg_slot) {
358 lose("bad rotate index", CHECK_(empty));
359 }
360 SlotState* dest_arg_state = slot_state(dest_arg_slot);
361 // Rotate the source argument (plus following N slots) into the
362 // position occupied by the dest argument (plus following N slots).
363 int rotate_count = type2size[dest_arg_state->_type];
364 // (no other rotate counts are currently supported)
365 if (arg_slot < dest_arg_slot) {
366 for (int i = 0; i < rotate_count; i++) {
367 SlotState temp = _outgoing.at(arg_slot);
368 _outgoing.remove_at(arg_slot);
369 _outgoing.insert_before(dest_arg_slot + rotate_count - 1, temp);
370 }
371 } else { // arg_slot > dest_arg_slot
372 for (int i = 0; i < rotate_count; i++) {
373 SlotState temp = _outgoing.at(arg_slot + rotate_count - 1);
374 _outgoing.remove_at(arg_slot + rotate_count - 1);
375 _outgoing.insert_before(dest_arg_slot, temp);
376 }
377 }
378 break;
379 }
380
381 case sun_dyn_AdapterMethodHandle::OP_DUP_ARGS: {
382 int dup_slots = chain().adapter_conversion_stack_pushes();
383 if (dup_slots <= 0) {
384 lose("bad dup count", CHECK_(empty));
385 }
386 for (int i = 0; i < dup_slots; i++) {
387 SlotState* dup = slot_state(arg_slot + 2*i);
388 if (dup == NULL) break; // safety net
389 if (dup->_type != T_VOID) _outgoing_argc += 1;
390 _outgoing.insert_before(i, (*dup));
391 }
392 break;
393 }
394
395 case sun_dyn_AdapterMethodHandle::OP_DROP_ARGS: {
396 int drop_slots = -chain().adapter_conversion_stack_pushes();
397 if (drop_slots <= 0) {
398 lose("bad drop count", CHECK_(empty));
399 }
400 for (int i = 0; i < drop_slots; i++) {
401 SlotState* drop = slot_state(arg_slot);
402 if (drop == NULL) break; // safety net
403 if (drop->_type != T_VOID) _outgoing_argc -= 1;
404 _outgoing.remove_at(arg_slot);
405 }
406 break;
407 }
408
409 case sun_dyn_AdapterMethodHandle::OP_COLLECT_ARGS: { //NYI, may GC
410 lose("unimplemented", CHECK_(empty));
411 break;
412 }
413
414 case sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS: {
415 klassOop array_klass_oop = NULL;
416 BasicType array_type = java_lang_Class::as_BasicType(chain().adapter_arg_oop(),
417 &array_klass_oop);
418 assert(array_type == T_OBJECT, "");
419 assert(Klass::cast(array_klass_oop)->oop_is_array(), "");
420 arrayKlassHandle array_klass(THREAD, array_klass_oop);
421 debug_only(array_klass_oop = (klassOop)badOop);
422
423 klassOop element_klass_oop = NULL;
424 BasicType element_type = java_lang_Class::as_BasicType(array_klass->component_mirror(),
425 &element_klass_oop);
426 KlassHandle element_klass(THREAD, element_klass_oop);
427 debug_only(element_klass_oop = (klassOop)badOop);
428
429 // Fetch the argument, which we will cast to the required array type.
430 assert(arg_state->_type == T_OBJECT, "");
431 ArgToken array_arg = arg_state->_arg;
432 array_arg = make_conversion(T_OBJECT, array_klass(), Bytecodes::_checkcast, array_arg, CHECK_(empty));
433 change_argument(T_OBJECT, arg_slot, T_VOID, ArgToken(tt_void));
434
435 // Check the required length.
436 int spread_slots = 1 + chain().adapter_conversion_stack_pushes();
437 int spread_length = spread_slots;
438 if (type2size[element_type] == 2) {
439 if (spread_slots % 2 != 0) spread_slots = -1; // force error
440 spread_length = spread_slots / 2;
441 }
442 if (spread_slots < 0) {
443 lose("bad spread length", CHECK_(empty));
444 }
445
446 jvalue length_jvalue; length_jvalue.i = spread_length;
447 ArgToken length_arg = make_prim_constant(T_INT, &length_jvalue, CHECK_(empty));
448 // Call a built-in method known to the JVM to validate the length.
449 ArgToken arglist[3];
450 arglist[0] = array_arg; // value to check
451 arglist[1] = length_arg; // length to check
452 arglist[2] = ArgToken(); // sentinel
453 make_invoke(NULL, vmIntrinsics::_checkSpreadArgument,
454 Bytecodes::_invokestatic, false, 3, &arglist[0], CHECK_(empty));
455
456 // Spread out the array elements.
457 Bytecodes::Code aload_op = Bytecodes::_aaload;
458 if (element_type != T_OBJECT) {
459 lose("primitive array NYI", CHECK_(empty));
460 }
461 int ap = arg_slot;
462 for (int i = 0; i < spread_length; i++) {
463 jvalue offset_jvalue; offset_jvalue.i = i;
464 ArgToken offset_arg = make_prim_constant(T_INT, &offset_jvalue, CHECK_(empty));
465 ArgToken element_arg = make_fetch(element_type, element_klass(), aload_op, array_arg, offset_arg, CHECK_(empty));
466 change_argument(T_VOID, ap, element_type, element_arg);
467 ap += type2size[element_type];
468 }
469 break;
470 }
471
472 case sun_dyn_AdapterMethodHandle::OP_FLYBY: //NYI, runs Java code
473 case sun_dyn_AdapterMethodHandle::OP_RICOCHET: //NYI, runs Java code
474 lose("unimplemented", CHECK_(empty));
475 break;
476
477 default:
478 lose("bad adapter conversion", CHECK_(empty));
479 break;
480 }
481 }
482
483 if (chain().is_bound()) {
484 // push a new argument
485 BasicType arg_type = chain().bound_arg_type();
486 jint arg_slot = chain().bound_arg_slot();
487 oop arg_oop = chain().bound_arg_oop();
488 ArgToken arg;
489 if (arg_type == T_OBJECT) {
490 arg = make_oop_constant(arg_oop, CHECK_(empty));
491 } else {
492 jvalue arg_value;
493 BasicType bt = java_lang_boxing_object::get_value(arg_oop, &arg_value);
494 if (bt == arg_type) {
495 arg = make_prim_constant(arg_type, &arg_value, CHECK_(empty));
496 } else {
497 lose("bad bound value", CHECK_(empty));
498 }
499 }
500 debug_only(arg_oop = badOop);
501 change_argument(T_VOID, arg_slot, arg_type, arg);
502 }
503
504 // this test must come after the body of the loop
505 if (!chain().is_last()) {
506 chain().next(CHECK_(empty));
507 } else {
508 break;
509 }
510 }
511
512 // finish the sequence with a tail-call to the ultimate target
513 // parameters are passed in logical order (recv 1st), not slot order
514 ArgToken* arglist = NEW_RESOURCE_ARRAY(ArgToken, _outgoing.length() + 1);
515 int ap = 0;
516 for (int i = _outgoing.length() - 1; i >= 0; i--) {
517 SlotState* arg_state = slot_state(i);
518 if (arg_state->_type == T_VOID) continue;
519 arglist[ap++] = _outgoing.at(i)._arg;
520 }
521 assert(ap == _outgoing_argc, "");
522 arglist[ap] = ArgToken(); // add a sentinel, for the sake of asserts
523 return make_invoke(chain().last_method_oop(),
524 vmIntrinsics::_none,
525 chain().last_invoke_code(), true,
526 ap, arglist, THREAD);
527 }
528
529
530 // -----------------------------------------------------------------------------
531 // MethodHandleWalker::walk_incoming_state
532 //
533 void MethodHandleWalker::walk_incoming_state(TRAPS) {
534 Handle mtype(THREAD, chain().method_type_oop());
535 int nptypes = java_dyn_MethodType::ptype_count(mtype());
536 _outgoing_argc = nptypes;
537 int argp = nptypes - 1;
538 if (argp >= 0) {
539 _outgoing.at_grow(argp, make_state(T_VOID, ArgToken(tt_void))); // presize
540 }
541 for (int i = 0; i < nptypes; i++) {
542 klassOop arg_type_klass = NULL;
543 BasicType arg_type = java_lang_Class::as_BasicType(
544 java_dyn_MethodType::ptype(mtype(), i), &arg_type_klass);
545 int index = new_local_index(arg_type);
546 ArgToken arg = make_parameter(arg_type, arg_type_klass, index, CHECK);
547 debug_only(arg_type_klass = (klassOop) NULL);
548 _outgoing.at_put(argp, make_state(arg_type, arg));
549 if (type2size[arg_type] == 2) {
550 // add the extra slot, so we can model the JVM stack
551 _outgoing.insert_before(argp+1, make_state(T_VOID, ArgToken(tt_void)));
552 }
553 --argp;
554 }
555 // call make_parameter at the end of the list for the return type
556 klassOop ret_type_klass = NULL;
557 BasicType ret_type = java_lang_Class::as_BasicType(
558 java_dyn_MethodType::rtype(mtype()), &ret_type_klass);
559 ArgToken ret = make_parameter(ret_type, ret_type_klass, -1, CHECK);
560 // ignore ret; client can catch it if needed
561 }
562
563
564 // -----------------------------------------------------------------------------
565 // MethodHandleWalker::change_argument
566 //
567 // This is messy because some kinds of arguments are paired with
568 // companion slots containing an empty value.
569 void MethodHandleWalker::change_argument(BasicType old_type, int slot, BasicType new_type,
570 const ArgToken& new_arg) {
571 int old_size = type2size[old_type];
572 int new_size = type2size[new_type];
573 if (old_size == new_size) {
574 // simple case first
575 _outgoing.at_put(slot, make_state(new_type, new_arg));
576 } else if (old_size > new_size) {
577 for (int i = old_size - 1; i >= new_size; i--) {
578 assert((i != 0) == (_outgoing.at(slot + i)._type == T_VOID), "");
579 _outgoing.remove_at(slot + i);
580 }
581 if (new_size > 0)
582 _outgoing.at_put(slot, make_state(new_type, new_arg));
583 else
584 _outgoing_argc -= 1; // deleted a real argument
585 } else {
586 for (int i = old_size; i < new_size; i++) {
587 _outgoing.insert_before(slot + i, make_state(T_VOID, ArgToken(tt_void)));
588 }
589 _outgoing.at_put(slot, make_state(new_type, new_arg));
590 if (old_size == 0)
591 _outgoing_argc += 1; // inserted a real argument
592 }
593 }
594
595
596 #ifdef ASSERT
597 int MethodHandleWalker::argument_count_slow() {
598 int args_seen = 0;
599 for (int i = _outgoing.length() - 1; i >= 0; i--) {
600 if (_outgoing.at(i)._type != T_VOID) {
601 ++args_seen;
602 }
603 }
604 return args_seen;
605 }
606 #endif
607
608
609 // -----------------------------------------------------------------------------
610 // MethodHandleCompiler
611
612 MethodHandleCompiler::MethodHandleCompiler(Handle root, methodHandle callee, bool is_invokedynamic, TRAPS)
613 : MethodHandleWalker(root, is_invokedynamic, THREAD),
614 _callee(callee),
615 _thread(THREAD),
616 _bytecode(THREAD, 50),
617 _constants(THREAD, 10),
618 _cur_stack(0),
619 _max_stack(0),
620 _rtype(T_ILLEGAL)
621 {
622
623 // Element zero is always the null constant.
624 (void) _constants.append(NULL);
625
626 // Set name and signature index.
627 _name_index = cpool_symbol_put(_callee->name());
628 _signature_index = cpool_symbol_put(_callee->signature());
629
630 // Get return type klass.
631 Handle first_mtype(THREAD, chain().method_type_oop());
632 // _rklass is NULL for primitives.
633 _rtype = java_lang_Class::as_BasicType(java_dyn_MethodType::rtype(first_mtype()), &_rklass);
634
635 int params = _callee->size_of_parameters(); // Incoming arguments plus receiver.
636 _num_params = for_invokedynamic() ? params - 1 : params; // XXX Check if callee is static?
637 }
638
639
640 // -----------------------------------------------------------------------------
641 // MethodHandleCompiler::compile
642 //
643 // Compile this MethodHandle into a bytecode adapter and return a
644 // methodOop.
645 methodHandle MethodHandleCompiler::compile(TRAPS) {
646 assert(_thread == THREAD, "must be same thread");
647 methodHandle nullHandle;
648 (void) walk(CHECK_(nullHandle));
649 return get_method_oop(CHECK_(nullHandle));
650 }
651
652
653 void MethodHandleCompiler::emit_bc(Bytecodes::Code op, int index) {
654 Bytecodes::check(op); // Are we legal?
655
656 switch (op) {
657 // b
658 case Bytecodes::_aconst_null:
659 case Bytecodes::_iconst_m1:
660 case Bytecodes::_iconst_0:
661 case Bytecodes::_iconst_1:
662 case Bytecodes::_iconst_2:
663 case Bytecodes::_iconst_3:
664 case Bytecodes::_iconst_4:
665 case Bytecodes::_iconst_5:
666 case Bytecodes::_lconst_0:
667 case Bytecodes::_lconst_1:
668 case Bytecodes::_fconst_0:
669 case Bytecodes::_fconst_1:
670 case Bytecodes::_fconst_2:
671 case Bytecodes::_dconst_0:
672 case Bytecodes::_dconst_1:
673 case Bytecodes::_iload_0:
674 case Bytecodes::_iload_1:
675 case Bytecodes::_iload_2:
676 case Bytecodes::_iload_3:
677 case Bytecodes::_lload_0:
678 case Bytecodes::_lload_1:
679 case Bytecodes::_lload_2:
680 case Bytecodes::_lload_3:
681 case Bytecodes::_fload_0:
682 case Bytecodes::_fload_1:
683 case Bytecodes::_fload_2:
684 case Bytecodes::_fload_3:
685 case Bytecodes::_dload_0:
686 case Bytecodes::_dload_1:
687 case Bytecodes::_dload_2:
688 case Bytecodes::_dload_3:
689 case Bytecodes::_aload_0:
690 case Bytecodes::_aload_1:
691 case Bytecodes::_aload_2:
692 case Bytecodes::_aload_3:
693 case Bytecodes::_istore_0:
694 case Bytecodes::_istore_1:
695 case Bytecodes::_istore_2:
696 case Bytecodes::_istore_3:
697 case Bytecodes::_lstore_0:
698 case Bytecodes::_lstore_1:
699 case Bytecodes::_lstore_2:
700 case Bytecodes::_lstore_3:
701 case Bytecodes::_fstore_0:
702 case Bytecodes::_fstore_1:
703 case Bytecodes::_fstore_2:
704 case Bytecodes::_fstore_3:
705 case Bytecodes::_dstore_0:
706 case Bytecodes::_dstore_1:
707 case Bytecodes::_dstore_2:
708 case Bytecodes::_dstore_3:
709 case Bytecodes::_astore_0:
710 case Bytecodes::_astore_1:
711 case Bytecodes::_astore_2:
712 case Bytecodes::_astore_3:
713 case Bytecodes::_i2l:
714 case Bytecodes::_i2f:
715 case Bytecodes::_i2d:
716 case Bytecodes::_i2b:
717 case Bytecodes::_i2c:
718 case Bytecodes::_i2s:
719 case Bytecodes::_l2i:
720 case Bytecodes::_l2f:
721 case Bytecodes::_l2d:
722 case Bytecodes::_f2i:
723 case Bytecodes::_f2l:
724 case Bytecodes::_f2d:
725 case Bytecodes::_d2i:
726 case Bytecodes::_d2l:
727 case Bytecodes::_d2f:
728 case Bytecodes::_ireturn:
729 case Bytecodes::_lreturn:
730 case Bytecodes::_freturn:
731 case Bytecodes::_dreturn:
732 case Bytecodes::_areturn:
733 case Bytecodes::_return:
734 assert(strcmp(Bytecodes::format(op), "b") == 0, "wrong bytecode format");
735 _bytecode.push(op);
736 break;
737
738 // bi
739 case Bytecodes::_ldc:
740 case Bytecodes::_iload:
741 case Bytecodes::_lload:
742 case Bytecodes::_fload:
743 case Bytecodes::_dload:
744 case Bytecodes::_aload:
745 case Bytecodes::_istore:
746 case Bytecodes::_lstore:
747 case Bytecodes::_fstore:
748 case Bytecodes::_dstore:
749 case Bytecodes::_astore:
750 assert(strcmp(Bytecodes::format(op), "bi") == 0, "wrong bytecode format");
751 assert((char) index == index, "index does not fit in 8-bit");
752 _bytecode.push(op);
753 _bytecode.push(index);
754 break;
755
756 // bii
757 case Bytecodes::_ldc2_w:
758 case Bytecodes::_checkcast:
759 assert(strcmp(Bytecodes::format(op), "bii") == 0, "wrong bytecode format");
760 assert((short) index == index, "index does not fit in 16-bit");
761 _bytecode.push(op);
762 _bytecode.push(index >> 8);
763 _bytecode.push(index);
764 break;
765
766 // bjj
767 case Bytecodes::_invokestatic:
768 case Bytecodes::_invokespecial:
769 case Bytecodes::_invokevirtual:
770 assert(strcmp(Bytecodes::format(op), "bjj") == 0, "wrong bytecode format");
771 assert((short) index == index, "index does not fit in 16-bit");
772 _bytecode.push(op);
773 _bytecode.push(index >> 8);
774 _bytecode.push(index);
775 break;
776
777 default:
778 ShouldNotReachHere();
779 }
780 }
781
782
783 void MethodHandleCompiler::emit_load(BasicType bt, int index) {
784 if (index <= 3) {
785 switch (bt) {
786 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
787 case T_INT: emit_bc(Bytecodes::cast(Bytecodes::_iload_0 + index)); break;
788 case T_LONG: emit_bc(Bytecodes::cast(Bytecodes::_lload_0 + index)); break;
789 case T_FLOAT: emit_bc(Bytecodes::cast(Bytecodes::_fload_0 + index)); break;
790 case T_DOUBLE: emit_bc(Bytecodes::cast(Bytecodes::_dload_0 + index)); break;
791 case T_OBJECT: emit_bc(Bytecodes::cast(Bytecodes::_aload_0 + index)); break;
792 default:
793 ShouldNotReachHere();
794 }
795 }
796 else {
797 switch (bt) {
798 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
799 case T_INT: emit_bc(Bytecodes::_iload, index); break;
800 case T_LONG: emit_bc(Bytecodes::_lload, index); break;
801 case T_FLOAT: emit_bc(Bytecodes::_fload, index); break;
802 case T_DOUBLE: emit_bc(Bytecodes::_dload, index); break;
803 case T_OBJECT: emit_bc(Bytecodes::_aload, index); break;
804 default:
805 ShouldNotReachHere();
806 }
807 }
808 stack_push(bt);
809 }
810
811 void MethodHandleCompiler::emit_store(BasicType bt, int index) {
812 if (index <= 3) {
813 switch (bt) {
814 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
815 case T_INT: emit_bc(Bytecodes::cast(Bytecodes::_istore_0 + index)); break;
816 case T_LONG: emit_bc(Bytecodes::cast(Bytecodes::_lstore_0 + index)); break;
817 case T_FLOAT: emit_bc(Bytecodes::cast(Bytecodes::_fstore_0 + index)); break;
818 case T_DOUBLE: emit_bc(Bytecodes::cast(Bytecodes::_dstore_0 + index)); break;
819 case T_OBJECT: emit_bc(Bytecodes::cast(Bytecodes::_astore_0 + index)); break;
820 default:
821 ShouldNotReachHere();
822 }
823 }
824 else {
825 switch (bt) {
826 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
827 case T_INT: emit_bc(Bytecodes::_istore, index); break;
828 case T_LONG: emit_bc(Bytecodes::_lstore, index); break;
829 case T_FLOAT: emit_bc(Bytecodes::_fstore, index); break;
830 case T_DOUBLE: emit_bc(Bytecodes::_dstore, index); break;
831 case T_OBJECT: emit_bc(Bytecodes::_astore, index); break;
832 default:
833 ShouldNotReachHere();
834 }
835 }
836 stack_pop(bt);
837 }
838
839
840 void MethodHandleCompiler::emit_load_constant(ArgToken arg) {
841 BasicType bt = arg.basic_type();
842 switch (bt) {
843 case T_INT: {
844 jint value = arg.get_jint();
845 if (-1 <= value && value <= 5)
846 emit_bc(Bytecodes::cast(Bytecodes::_iconst_0 + value));
847 else
848 emit_bc(Bytecodes::_ldc, cpool_int_put(value));
849 break;
850 }
851 case T_LONG: {
852 jlong value = arg.get_jlong();
853 if (0 <= value && value <= 1)
854 emit_bc(Bytecodes::cast(Bytecodes::_lconst_0 + (int) value));
855 else
856 emit_bc(Bytecodes::_ldc2_w, cpool_long_put(value));
857 break;
858 }
859 case T_FLOAT: {
860 jfloat value = arg.get_jfloat();
861 if (value == 0.0 || value == 1.0 || value == 2.0)
862 emit_bc(Bytecodes::cast(Bytecodes::_fconst_0 + (int) value));
863 else
864 emit_bc(Bytecodes::_ldc, cpool_float_put(value));
865 break;
866 }
867 case T_DOUBLE: {
868 jdouble value = arg.get_jdouble();
869 if (value == 0.0 || value == 1.0)
870 emit_bc(Bytecodes::cast(Bytecodes::_dconst_0 + (int) value));
871 else
872 emit_bc(Bytecodes::_ldc2_w, cpool_double_put(value));
873 break;
874 }
875 case T_OBJECT: {
876 Handle value = arg.object();
877 if (value.is_null())
878 emit_bc(Bytecodes::_aconst_null);
879 else
880 emit_bc(Bytecodes::_ldc, cpool_object_put(value));
881 break;
882 }
883 default:
884 ShouldNotReachHere();
885 }
886 stack_push(bt);
887 }
888
889
890 MethodHandleWalker::ArgToken
891 MethodHandleCompiler::make_conversion(BasicType type, klassOop tk, Bytecodes::Code op,
892 const ArgToken& src, TRAPS) {
893
894 BasicType srctype = src.basic_type();
895 int index = src.index();
896
897 switch (op) {
898 case Bytecodes::_i2l:
899 case Bytecodes::_i2f:
900 case Bytecodes::_i2d:
901 case Bytecodes::_i2b:
902 case Bytecodes::_i2c:
903 case Bytecodes::_i2s:
904
905 case Bytecodes::_l2i:
906 case Bytecodes::_l2f:
907 case Bytecodes::_l2d:
908
909 case Bytecodes::_f2i:
910 case Bytecodes::_f2l:
911 case Bytecodes::_f2d:
912
913 case Bytecodes::_d2i:
914 case Bytecodes::_d2l:
915 case Bytecodes::_d2f:
916 emit_load(srctype, index);
917 stack_pop(srctype); // pop the src type
918 emit_bc(op);
919 stack_push(type); // push the dest value
920 if (srctype != type)
921 index = new_local_index(type);
922 emit_store(type, index);
923 break;
924
925 case Bytecodes::_checkcast:
926 emit_load(srctype, index);
927 emit_bc(op, cpool_klass_put(tk));
928 emit_store(srctype, index);
929 break;
930
931 default:
932 ShouldNotReachHere();
933 }
934
935 return make_parameter(type, tk, index, THREAD);
936 }
937
938
939 // -----------------------------------------------------------------------------
940 // MethodHandleCompiler
941 //
942
943 static jvalue zero_jvalue;
944
945 // Emit bytecodes for the given invoke instruction.
946 MethodHandleWalker::ArgToken
947 MethodHandleCompiler::make_invoke(methodOop m, vmIntrinsics::ID iid,
948 Bytecodes::Code op, bool tailcall,
949 int argc, MethodHandleWalker::ArgToken* argv,
950 TRAPS) {
951 if (m == NULL) {
952 // Get the intrinsic methodOop.
953 m = vmIntrinsics::method_for(iid);
954 }
955
956 klassOop klass = m->method_holder();
957 symbolOop name = m->name();
958 symbolOop signature = m->signature();
959
960 // This generated adapter method should be in the same class as the
961 // DMH target method (for accessability reasons).
962 if (tailcall) {
963 _target_klass = klass;
964 }
965
966 // instanceKlass* ik = instanceKlass::cast(klass);
967 // tty->print_cr("MethodHandleCompiler::make_invoke: %s %s.%s%s", Bytecodes::name(op), ik->external_name(), name->as_C_string(), signature->as_C_string());
968
969 // Inline the method.
970 InvocationCounter* ic = m->invocation_counter();
971 ic->set_carry();
972
973 for (int i = 0; i < argc; i++) {
974 ArgToken arg = argv[i];
975 TokenType tt = arg.token_type();
976 BasicType bt = arg.basic_type();
977
978 switch (tt) {
979 case tt_parameter:
980 case tt_temporary:
981 emit_load(bt, arg.index());
982 break;
983 case tt_constant:
984 emit_load_constant(arg);
985 break;
986 case tt_illegal:
987 // Sentinel.
988 assert(i == (argc - 1), "sentinel must be last entry");
989 break;
990 case tt_void:
991 default:
992 ShouldNotReachHere();
993 }
994 }
995
996 // Populate constant pool.
997 int name_index = cpool_symbol_put(name);
998 int signature_index = cpool_symbol_put(signature);
999 int name_and_type_index = cpool_name_and_type_put(name_index, signature_index);
1000 int klass_index = cpool_klass_put(klass);
1001 int methodref_index = cpool_methodref_put(klass_index, name_and_type_index);
1002
1003 // Generate invoke.
1004 switch (op) {
1005 case Bytecodes::_invokestatic:
1006 case Bytecodes::_invokespecial:
1007 case Bytecodes::_invokevirtual:
1008 emit_bc(op, methodref_index);
1009 break;
1010 case Bytecodes::_invokeinterface:
1011 Unimplemented();
1012 break;
1013 default:
1014 ShouldNotReachHere();
1015 }
1016
1017 // If tailcall, we have walked all the way to a direct method handle.
1018 // Otherwise, make a recursive call to some helper routine.
1019 BasicType rbt = m->result_type();
1020 ArgToken ret;
1021 if (tailcall) {
1022 if (rbt != _rtype) {
1023 if (rbt == T_VOID) {
1024 // push a zero of the right sort
1025 ArgToken zero;
1026 if (_rtype == T_OBJECT) {
1027 zero = make_oop_constant(NULL, CHECK_(zero));
1028 } else {
1029 zero = make_prim_constant(_rtype, &zero_jvalue, CHECK_(zero));
1030 }
1031 emit_load_constant(zero);
1032 } else if (_rtype == T_VOID) {
1033 // We'll emit a _return with something on the stack.
1034 // It's OK to ignore what's on the stack.
1035 } else {
1036 tty->print_cr("*** rbt=%d != rtype=%d", rbt, _rtype);
1037 assert(false, "IMPLEMENT ME");
1038 }
1039 }
1040 switch (_rtype) {
1041 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
1042 case T_INT: emit_bc(Bytecodes::_ireturn); break;
1043 case T_LONG: emit_bc(Bytecodes::_lreturn); break;
1044 case T_FLOAT: emit_bc(Bytecodes::_freturn); break;
1045 case T_DOUBLE: emit_bc(Bytecodes::_dreturn); break;
1046 case T_VOID: emit_bc(Bytecodes::_return); break;
1047 case T_OBJECT:
1048 if (_rklass.not_null() && _rklass() != SystemDictionary::object_klass())
1049 emit_bc(Bytecodes::_checkcast, cpool_klass_put(_rklass()));
1050 emit_bc(Bytecodes::_areturn);
1051 break;
1052 default: ShouldNotReachHere();
1053 }
1054 ret = ArgToken(); // Dummy return value.
1055 }
1056 else {
1057 stack_push(rbt); // The return value is already pushed onto the stack.
1058 int index = new_local_index(rbt);
1059 switch (rbt) {
1060 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
1061 case T_INT: case T_LONG: case T_FLOAT: case T_DOUBLE:
1062 case T_OBJECT:
1063 emit_store(rbt, index);
1064 ret = ArgToken(tt_temporary, rbt, index);
1065 break;
1066 case T_VOID:
1067 ret = ArgToken(tt_void);
1068 break;
1069 default:
1070 ShouldNotReachHere();
1071 }
1072 }
1073
1074 return ret;
1075 }
1076
1077 MethodHandleWalker::ArgToken
1078 MethodHandleCompiler::make_fetch(BasicType type, klassOop tk, Bytecodes::Code op,
1079 const MethodHandleWalker::ArgToken& base,
1080 const MethodHandleWalker::ArgToken& offset,
1081 TRAPS) {
1082 Unimplemented();
1083 return ArgToken();
1084 }
1085
1086
1087 int MethodHandleCompiler::cpool_primitive_put(BasicType bt, jvalue* con) {
1088 jvalue con_copy;
1089 assert(bt < T_OBJECT, "");
1090 if (type2aelembytes(bt) < jintSize) {
1091 // widen to int
1092 con_copy = (*con);
1093 con = &con_copy;
1094 switch (bt) {
1095 case T_BOOLEAN: con->i = (con->z ? 1 : 0); break;
1096 case T_BYTE: con->i = con->b; break;
1097 case T_CHAR: con->i = con->c; break;
1098 case T_SHORT: con->i = con->s; break;
1099 default: ShouldNotReachHere();
1100 }
1101 bt = T_INT;
1102 }
1103
1104 // for (int i = 1, imax = _constants.length(); i < imax; i++) {
1105 // ConstantValue* con = _constants.at(i);
1106 // if (con != NULL && con->is_primitive() && con->_type == bt) {
1107 // bool match = false;
1108 // switch (type2size[bt]) {
1109 // case 1: if (pcon->_value.i == con->i) match = true; break;
1110 // case 2: if (pcon->_value.j == con->j) match = true; break;
1111 // }
1112 // if (match)
1113 // return i;
1114 // }
1115 // }
1116 ConstantValue* cv = new ConstantValue(bt, *con);
1117 int index = _constants.append(cv);
1118
1119 // long and double entries take 2 slots, we add another empty entry.
1120 if (type2size[bt] == 2)
1121 (void) _constants.append(NULL);
1122
1123 return index;
1124 }
1125
1126
1127 constantPoolHandle MethodHandleCompiler::get_constant_pool(TRAPS) const {
1128 constantPoolHandle nullHandle;
1129 bool is_conc_safe = true;
1130 constantPoolOop cpool_oop = oopFactory::new_constantPool(_constants.length(), is_conc_safe, CHECK_(nullHandle));
1131 constantPoolHandle cpool(THREAD, cpool_oop);
1132
1133 // Fill the real constant pool skipping the zero element.
1134 for (int i = 1; i < _constants.length(); i++) {
1135 ConstantValue* cv = _constants.at(i);
1136 switch (cv->tag()) {
1137 case JVM_CONSTANT_Utf8: cpool->symbol_at_put( i, cv->symbol_oop() ); break;
1138 case JVM_CONSTANT_Integer: cpool->int_at_put( i, cv->get_jint() ); break;
1139 case JVM_CONSTANT_Float: cpool->float_at_put( i, cv->get_jfloat() ); break;
1140 case JVM_CONSTANT_Long: cpool->long_at_put( i, cv->get_jlong() ); break;
1141 case JVM_CONSTANT_Double: cpool->double_at_put( i, cv->get_jdouble() ); break;
1142 case JVM_CONSTANT_Class: cpool->klass_at_put( i, cv->klass_oop() ); break;
1143 case JVM_CONSTANT_Methodref: cpool->method_at_put( i, cv->first_index(), cv->second_index()); break;
1144 case JVM_CONSTANT_NameAndType: cpool->name_and_type_at_put(i, cv->first_index(), cv->second_index()); break;
1145 case JVM_CONSTANT_Object: cpool->object_at_put( i, cv->object_oop() ); break;
1146 default: ShouldNotReachHere();
1147 }
1148
1149 switch (cv->tag()) {
1150 case JVM_CONSTANT_Long:
1151 case JVM_CONSTANT_Double:
1152 i++; // Skip empty entry.
1153 assert(_constants.at(i) == NULL, "empty entry");
1154 break;
1155 }
1156 }
1157
1158 // Set the constant pool holder to the target method's class.
1159 cpool->set_pool_holder(_target_klass());
1160
1161 return cpool;
1162 }
1163
1164
1165 methodHandle MethodHandleCompiler::get_method_oop(TRAPS) const {
1166 methodHandle nullHandle;
1167 // Create a method that holds the generated bytecode. invokedynamic
1168 // has no receiver, normal MH calls do.
1169 int flags_bits;
1170 if (for_invokedynamic())
1171 flags_bits = (/*JVM_MH_INVOKE_BITS |*/ JVM_ACC_PUBLIC | JVM_ACC_FINAL | JVM_ACC_STATIC);
1172 else
1173 flags_bits = (/*JVM_MH_INVOKE_BITS |*/ JVM_ACC_PUBLIC | JVM_ACC_FINAL);
1174
1175 bool is_conc_safe = true;
1176 methodOop m_oop = oopFactory::new_method(bytecode_length(),
1177 accessFlags_from(flags_bits),
1178 0, 0, 0, is_conc_safe, CHECK_(nullHandle));
1179 methodHandle m(THREAD, m_oop);
1180 m_oop = NULL; // oop not GC safe
1181
1182 constantPoolHandle cpool = get_constant_pool(CHECK_(nullHandle));
1183 m->set_constants(cpool());
1184
1185 m->set_name_index(_name_index);
1186 m->set_signature_index(_signature_index);
1187
1188 m->set_code((address) bytecode());
1189
1190 m->set_max_stack(_max_stack);
1191 m->set_max_locals(max_locals());
1192 m->set_size_of_parameters(_num_params);
1193
1194 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1195 m->set_exception_table(exception_handlers());
1196
1197 // Set the carry bit of the invocation counter to force inlining of
1198 // the adapter.
1199 InvocationCounter* ic = m->invocation_counter();
1200 ic->set_carry();
1201
1202 // Rewrite the method and set up the constant pool cache.
1203 objArrayOop m_array = oopFactory::new_system_objArray(1, CHECK_(nullHandle));
1204 objArrayHandle methods(THREAD, m_array);
1205 methods->obj_at_put(0, m());
1206 Rewriter::rewrite(_target_klass(), cpool, methods, CHECK_(nullHandle)); // Use fake class.
1207
1208 #ifndef PRODUCT
1209 if (TraceMethodHandles) {
1210 m->print();
1211 m->print_codes();
1212 }
1213 #endif //PRODUCT
1214
1215 return m;
1216 }
1217
1218
1219 #ifndef PRODUCT
1220
1221 #if 0
1222 // MH printer for debugging.
1223
1224 class MethodHandlePrinter : public MethodHandleWalker {
1225 private:
1226 outputStream* _out;
1227 bool _verbose;
1228 int _temp_num;
1229 stringStream _strbuf;
1230 const char* strbuf() {
1231 const char* s = _strbuf.as_string();
1232 _strbuf.reset();
1233 return s;
1234 }
1235 ArgToken token(const char* str) {
1236 return (ArgToken) str;
1237 }
1238 void start_params() {
1239 _out->print("(");
1240 }
1241 void end_params() {
1242 if (_verbose) _out->print("\n");
1243 _out->print(") => {");
1244 }
1245 void put_type_name(BasicType type, klassOop tk, outputStream* s) {
1246 const char* kname = NULL;
1247 if (tk != NULL)
1248 kname = Klass::cast(tk)->external_name();
1249 s->print("%s", (kname != NULL) ? kname : type2name(type));
1250 }
1251 ArgToken maybe_make_temp(const char* statement_op, BasicType type, const char* temp_name) {
1252 const char* value = strbuf();
1253 if (!_verbose) return token(value);
1254 // make an explicit binding for each separate value
1255 _strbuf.print("%s%d", temp_name, ++_temp_num);
1256 const char* temp = strbuf();
1257 _out->print("\n %s %s %s = %s;", statement_op, type2name(type), temp, value);
1258 return token(temp);
1259 }
1260
1261 public:
1262 MethodHandlePrinter(Handle root, bool verbose, outputStream* out, TRAPS)
1263 : MethodHandleWalker(root, THREAD),
1264 _out(out),
1265 _verbose(verbose),
1266 _temp_num(0)
1267 {
1268 start_params();
1269 }
1270 virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
1271 if (argnum < 0) {
1272 end_params();
1273 return NULL;
1274 }
1275 if (argnum == 0) {
1276 _out->print(_verbose ? "\n " : "");
1277 } else {
1278 _out->print(_verbose ? ",\n " : ", ");
1279 }
1280 if (argnum >= _temp_num)
1281 _temp_num = argnum;
1282 // generate an argument name
1283 _strbuf.print("a%d", argnum);
1284 const char* arg = strbuf();
1285 put_type_name(type, tk, _out);
1286 _out->print(" %s", arg);
1287 return token(arg);
1288 }
1289 virtual ArgToken make_oop_constant(oop con, TRAPS) {
1290 if (con == NULL)
1291 _strbuf.print("null");
1292 else
1293 con->print_value_on(&_strbuf);
1294 if (_strbuf.size() == 0) { // yuck
1295 _strbuf.print("(a ");
1296 put_type_name(T_OBJECT, con->klass(), &_strbuf);
1297 _strbuf.print(")");
1298 }
1299 return maybe_make_temp("constant", T_OBJECT, "k");
1300 }
1301 virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
1302 java_lang_boxing_object::print(type, con, &_strbuf);
1303 return maybe_make_temp("constant", type, "k");
1304 }
1305 virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS) {
1306 _strbuf.print("%s(%s", Bytecodes::name(op), (const char*)src);
1307 if (tk != NULL) {
1308 _strbuf.print(", ");
1309 put_type_name(type, tk, &_strbuf);
1310 }
1311 _strbuf.print(")");
1312 return maybe_make_temp("convert", type, "v");
1313 }
1314 virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS) {
1315 _strbuf.print("%s(%s, %s", Bytecodes::name(op), (const char*)base, (const char*)offset);
1316 if (tk != NULL) {
1317 _strbuf.print(", ");
1318 put_type_name(type, tk, &_strbuf);
1319 }
1320 _strbuf.print(")");
1321 return maybe_make_temp("fetch", type, "x");
1322 }
1323 virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid,
1324 Bytecodes::Code op, bool tailcall,
1325 int argc, ArgToken* argv, TRAPS) {
1326 symbolOop name, sig;
1327 if (m != NULL) {
1328 name = m->name();
1329 sig = m->signature();
1330 } else {
1331 name = vmSymbols::symbol_at(vmIntrinsics::name_for(iid));
1332 sig = vmSymbols::symbol_at(vmIntrinsics::signature_for(iid));
1333 }
1334 _strbuf.print("%s %s%s(", Bytecodes::name(op), name->as_C_string(), sig->as_C_string());
1335 for (int i = 0; i < argc; i++) {
1336 _strbuf.print("%s%s", (i > 0 ? ", " : ""), (const char*)argv[i]);
1337 }
1338 _strbuf.print(")");
1339 if (!tailcall) {
1340 BasicType rt = char2type(sig->byte_at(sig->utf8_length()-1));
1341 if (rt == T_ILLEGAL) rt = T_OBJECT; // ';' at the end of '(...)L...;'
1342 return maybe_make_temp("invoke", rt, "x");
1343 } else {
1344 const char* ret = strbuf();
1345 _out->print(_verbose ? "\n return " : " ");
1346 _out->print("%s", ret);
1347 _out->print(_verbose ? "\n}\n" : " }");
1348 }
1349 return ArgToken();
1350 }
1351
1352 virtual void set_method_handle(oop mh) {
1353 if (WizardMode && Verbose) {
1354 tty->print("\n--- next target: ");
1355 mh->print();
1356 }
1357 }
1358
1359 static void print(Handle root, bool verbose, outputStream* out, TRAPS) {
1360 ResourceMark rm;
1361 MethodHandlePrinter printer(root, verbose, out, CHECK);
1362 printer.walk(CHECK);
1363 out->print("\n");
1364 }
1365 static void print(Handle root, bool verbose = Verbose, outputStream* out = tty) {
1366 EXCEPTION_MARK;
1367 ResourceMark rm;
1368 MethodHandlePrinter printer(root, verbose, out, THREAD);
1369 if (!HAS_PENDING_EXCEPTION)
1370 printer.walk(THREAD);
1371 if (HAS_PENDING_EXCEPTION) {
1372 oop ex = PENDING_EXCEPTION;
1373 CLEAR_PENDING_EXCEPTION;
1374 out->print("\n*** ");
1375 if (ex != Universe::virtual_machine_error_instance())
1376 ex->print_on(out);
1377 else
1378 out->print("lose: %s", printer.lose_message());
1379 out->print("\n}\n");
1380 }
1381 out->print("\n");
1382 }
1383 };
1384 #endif // 0
1385
1386 extern "C"
1387 void print_method_handle(oop mh) {
1388 if (java_dyn_MethodHandle::is_instance(mh)) {
1389 //MethodHandlePrinter::print(mh);
1390 } else {
1391 tty->print("*** not a method handle: ");
1392 mh->print();
1393 }
1394 }
1395
1396 #endif // PRODUCT