1 /*
2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "interpreter/rewriter.hpp"
27 #include "memory/oopFactory.hpp"
28 #include "prims/methodHandleWalk.hpp"
29
30 /*
31 * JSR 292 reference implementation: method handle structure analysis
32 */
33
34
35 // -----------------------------------------------------------------------------
36 // MethodHandleChain
37
38 void MethodHandleChain::set_method_handle(Handle mh, TRAPS) {
39 if (!java_dyn_MethodHandle::is_instance(mh())) lose("bad method handle", CHECK);
40
41 // set current method handle and unpack partially
42 _method_handle = mh;
43 _is_last = false;
44 _is_bound = false;
45 _arg_slot = -1;
46 _arg_type = T_VOID;
47 _conversion = -1;
48 _last_invoke = Bytecodes::_nop; //arbitrary non-garbage
49
50 if (sun_dyn_DirectMethodHandle::is_instance(mh())) {
51 set_last_method(mh(), THREAD);
52 return;
53 }
54 if (sun_dyn_AdapterMethodHandle::is_instance(mh())) {
55 _conversion = AdapterMethodHandle_conversion();
56 assert(_conversion != -1, "bad conv value");
57 assert(sun_dyn_BoundMethodHandle::is_instance(mh()), "also BMH");
58 }
59 if (sun_dyn_BoundMethodHandle::is_instance(mh())) {
60 if (!is_adapter()) // keep AMH and BMH separate in this model
61 _is_bound = true;
62 _arg_slot = BoundMethodHandle_vmargslot();
63 oop target = MethodHandle_vmtarget_oop();
64 if (!is_bound() || java_dyn_MethodHandle::is_instance(target)) {
65 _arg_type = compute_bound_arg_type(target, NULL, _arg_slot, CHECK);
66 } else if (target != NULL && target->is_method()) {
67 methodOop m = (methodOop) target;
68 _arg_type = compute_bound_arg_type(NULL, m, _arg_slot, CHECK);
69 set_last_method(mh(), CHECK);
70 } else {
71 _is_bound = false; // lose!
72 }
73 }
74 if (is_bound() && _arg_type == T_VOID) {
75 lose("bad vmargslot", CHECK);
76 }
77 if (!is_bound() && !is_adapter()) {
78 lose("unrecognized MH type", CHECK);
79 }
80 }
81
82
83 void MethodHandleChain::set_last_method(oop target, TRAPS) {
84 _is_last = true;
85 klassOop receiver_limit_oop = NULL;
86 int flags = 0;
87 methodOop m = MethodHandles::decode_method(target, receiver_limit_oop, flags);
88 _last_method = methodHandle(THREAD, m);
89 if ((flags & MethodHandles::_dmf_has_receiver) == 0)
90 _last_invoke = Bytecodes::_invokestatic;
91 else if ((flags & MethodHandles::_dmf_does_dispatch) == 0)
92 _last_invoke = Bytecodes::_invokespecial;
93 else if ((flags & MethodHandles::_dmf_from_interface) != 0)
94 _last_invoke = Bytecodes::_invokeinterface;
95 else
96 _last_invoke = Bytecodes::_invokevirtual;
97 }
98
99
100 BasicType MethodHandleChain::compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS) {
101 // There is no direct indication of whether the argument is primitive or not.
102 // It is implied by the _vmentry code, and by the MethodType of the target.
103 BasicType arg_type = T_VOID;
104 if (target != NULL) {
105 oop mtype = java_dyn_MethodHandle::type(target);
106 int arg_num = MethodHandles::argument_slot_to_argnum(mtype, arg_slot);
107 if (arg_num >= 0) {
108 oop ptype = java_dyn_MethodType::ptype(mtype, arg_num);
109 arg_type = java_lang_Class::as_BasicType(ptype);
110 }
111 } else if (m != NULL) {
112 // figure out the argument type from the slot
113 // FIXME: make this explicit in the MH
114 int cur_slot = m->size_of_parameters();
115 if (arg_slot >= cur_slot)
116 return T_VOID;
117 if (!m->is_static()) {
118 cur_slot -= type2size[T_OBJECT];
119 if (cur_slot == arg_slot)
120 return T_OBJECT;
121 }
122 ResourceMark rm(THREAD);
123 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
124 BasicType bt = ss.type();
125 cur_slot -= type2size[bt];
126 if (cur_slot <= arg_slot) {
127 if (cur_slot == arg_slot)
128 arg_type = bt;
129 break;
130 }
131 }
132 }
133 if (arg_type == T_ARRAY)
134 arg_type = T_OBJECT;
135 return arg_type;
136 }
137
138
139 void MethodHandleChain::lose(const char* msg, TRAPS) {
140 _lose_message = msg;
141 if (!THREAD->is_Java_thread() || ((JavaThread*)THREAD)->thread_state() != _thread_in_vm) {
142 // throw a preallocated exception
143 THROW_OOP(Universe::virtual_machine_error_instance());
144 }
145 THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
146 }
147
148
149 // -----------------------------------------------------------------------------
150 // MethodHandleWalker
151
152 Bytecodes::Code MethodHandleWalker::conversion_code(BasicType src, BasicType dest) {
153 if (is_subword_type(src)) {
154 src = T_INT; // all subword src types act like int
155 }
156 if (src == dest) {
157 return Bytecodes::_nop;
158 }
159
160 #define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d))
161 switch (SRC_DEST(src, dest)) {
162 case SRC_DEST(T_INT, T_LONG): return Bytecodes::_i2l;
163 case SRC_DEST(T_INT, T_FLOAT): return Bytecodes::_i2f;
164 case SRC_DEST(T_INT, T_DOUBLE): return Bytecodes::_i2d;
165 case SRC_DEST(T_INT, T_BYTE): return Bytecodes::_i2b;
166 case SRC_DEST(T_INT, T_CHAR): return Bytecodes::_i2c;
167 case SRC_DEST(T_INT, T_SHORT): return Bytecodes::_i2s;
168
169 case SRC_DEST(T_LONG, T_INT): return Bytecodes::_l2i;
170 case SRC_DEST(T_LONG, T_FLOAT): return Bytecodes::_l2f;
171 case SRC_DEST(T_LONG, T_DOUBLE): return Bytecodes::_l2d;
172
173 case SRC_DEST(T_FLOAT, T_INT): return Bytecodes::_f2i;
174 case SRC_DEST(T_FLOAT, T_LONG): return Bytecodes::_f2l;
175 case SRC_DEST(T_FLOAT, T_DOUBLE): return Bytecodes::_f2d;
176
177 case SRC_DEST(T_DOUBLE, T_INT): return Bytecodes::_d2i;
178 case SRC_DEST(T_DOUBLE, T_LONG): return Bytecodes::_d2l;
179 case SRC_DEST(T_DOUBLE, T_FLOAT): return Bytecodes::_d2f;
180 }
181 #undef SRC_DEST
182
183 // cannot do it in one step, or at all
184 return Bytecodes::_illegal;
185 }
186
187
188 // -----------------------------------------------------------------------------
189 // MethodHandleWalker::walk
190 //
191 MethodHandleWalker::ArgToken
192 MethodHandleWalker::walk(TRAPS) {
193 ArgToken empty = ArgToken(); // Empty return value.
194
195 walk_incoming_state(CHECK_(empty));
196
197 for (;;) {
198 set_method_handle(chain().method_handle_oop());
199
200 assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
201
202 if (chain().is_adapter()) {
203 int conv_op = chain().adapter_conversion_op();
204 int arg_slot = chain().adapter_arg_slot();
205 SlotState* arg_state = slot_state(arg_slot);
206 if (arg_state == NULL
207 && conv_op > sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW) {
208 lose("bad argument index", CHECK_(empty));
209 }
210
211 // perform the adapter action
212 switch (chain().adapter_conversion_op()) {
213 case sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY:
214 // No changes to arguments; pass the bits through.
215 break;
216
217 case sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW: {
218 // To keep the verifier happy, emit bitwise ("raw") conversions as needed.
219 // See MethodHandles::same_basic_type_for_arguments for allowed conversions.
220 Handle incoming_mtype(THREAD, chain().method_type_oop());
221 oop outgoing_mh_oop = chain().vmtarget_oop();
222 if (!java_dyn_MethodHandle::is_instance(outgoing_mh_oop))
223 lose("outgoing target not a MethodHandle", CHECK_(empty));
224 Handle outgoing_mtype(THREAD, java_dyn_MethodHandle::type(outgoing_mh_oop));
225 outgoing_mh_oop = NULL; // GC safety
226
227 int nptypes = java_dyn_MethodType::ptype_count(outgoing_mtype());
228 if (nptypes != java_dyn_MethodType::ptype_count(incoming_mtype()))
229 lose("incoming and outgoing parameter count do not agree", CHECK_(empty));
230
231 for (int i = 0, slot = _outgoing.length() - 1; slot >= 0; slot--) {
232 SlotState* arg_state = slot_state(slot);
233 if (arg_state->_type == T_VOID) continue;
234 ArgToken arg = _outgoing.at(slot)._arg;
235
236 klassOop in_klass = NULL;
237 klassOop out_klass = NULL;
238 BasicType inpbt = java_lang_Class::as_BasicType(java_dyn_MethodType::ptype(incoming_mtype(), i), &in_klass);
239 BasicType outpbt = java_lang_Class::as_BasicType(java_dyn_MethodType::ptype(outgoing_mtype(), i), &out_klass);
240 assert(inpbt == arg.basic_type(), "sanity");
241
242 if (inpbt != outpbt) {
243 vmIntrinsics::ID iid = vmIntrinsics::for_raw_conversion(inpbt, outpbt);
244 if (iid == vmIntrinsics::_none) {
245 lose("no raw conversion method", CHECK_(empty));
246 }
247 ArgToken arglist[2];
248 arglist[0] = arg; // outgoing 'this'
249 arglist[1] = ArgToken(); // sentinel
250 arg = make_invoke(NULL, iid, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK_(empty));
251 change_argument(inpbt, slot, outpbt, arg);
252 }
253
254 i++; // We need to skip void slots at the top of the loop.
255 }
256
257 BasicType inrbt = java_lang_Class::as_BasicType(java_dyn_MethodType::rtype(incoming_mtype()));
258 BasicType outrbt = java_lang_Class::as_BasicType(java_dyn_MethodType::rtype(outgoing_mtype()));
259 if (inrbt != outrbt) {
260 if (inrbt == T_INT && outrbt == T_VOID) {
261 // See comments in MethodHandles::same_basic_type_for_arguments.
262 } else {
263 assert(false, "IMPLEMENT ME");
264 lose("no raw conversion method", CHECK_(empty));
265 }
266 }
267 break;
268 }
269
270 case sun_dyn_AdapterMethodHandle::OP_CHECK_CAST: {
271 // checkcast the Nth outgoing argument in place
272 klassOop dest_klass = NULL;
273 BasicType dest = java_lang_Class::as_BasicType(chain().adapter_arg_oop(), &dest_klass);
274 assert(dest == T_OBJECT, "");
275 assert(dest == arg_state->_type, "");
276 ArgToken arg = arg_state->_arg;
277 ArgToken new_arg = make_conversion(T_OBJECT, dest_klass, Bytecodes::_checkcast, arg, CHECK_(empty));
278 assert(arg.index() == new_arg.index(), "should be the same index");
279 debug_only(dest_klass = (klassOop)badOop);
280 break;
281 }
282
283 case sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM: {
284 // i2l, etc., on the Nth outgoing argument in place
285 BasicType src = chain().adapter_conversion_src_type(),
286 dest = chain().adapter_conversion_dest_type();
287 Bytecodes::Code bc = conversion_code(src, dest);
288 ArgToken arg = arg_state->_arg;
289 if (bc == Bytecodes::_nop) {
290 break;
291 } else if (bc != Bytecodes::_illegal) {
292 arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
293 } else if (is_subword_type(dest)) {
294 bc = conversion_code(src, T_INT);
295 if (bc != Bytecodes::_illegal) {
296 arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
297 bc = conversion_code(T_INT, dest);
298 arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
299 }
300 }
301 if (bc == Bytecodes::_illegal) {
302 lose("bad primitive conversion", CHECK_(empty));
303 }
304 change_argument(src, arg_slot, dest, arg);
305 break;
306 }
307
308 case sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM: {
309 // checkcast to wrapper type & call intValue, etc.
310 BasicType dest = chain().adapter_conversion_dest_type();
311 ArgToken arg = arg_state->_arg;
312 arg = make_conversion(T_OBJECT, SystemDictionary::box_klass(dest),
313 Bytecodes::_checkcast, arg, CHECK_(empty));
314 vmIntrinsics::ID unboxer = vmIntrinsics::for_unboxing(dest);
315 if (unboxer == vmIntrinsics::_none) {
316 lose("no unboxing method", CHECK_(empty));
317 }
318 ArgToken arglist[2];
319 arglist[0] = arg; // outgoing 'this'
320 arglist[1] = ArgToken(); // sentinel
321 arg = make_invoke(NULL, unboxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_(empty));
322 change_argument(T_OBJECT, arg_slot, dest, arg);
323 break;
324 }
325
326 case sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF: {
327 // call wrapper type.valueOf
328 BasicType src = chain().adapter_conversion_src_type();
329 ArgToken arg = arg_state->_arg;
330 vmIntrinsics::ID boxer = vmIntrinsics::for_boxing(src);
331 if (boxer == vmIntrinsics::_none) {
332 lose("no boxing method", CHECK_(empty));
333 }
334 ArgToken arglist[2];
335 arglist[0] = arg; // outgoing value
336 arglist[1] = ArgToken(); // sentinel
337 arg = make_invoke(NULL, boxer, Bytecodes::_invokevirtual, false, 1, &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 if (_rtype == T_ARRAY) _rtype = T_OBJECT;
635
636 int params = _callee->size_of_parameters(); // Incoming arguments plus receiver.
637 _num_params = for_invokedynamic() ? params - 1 : params; // XXX Check if callee is static?
638 }
639
640
641 // -----------------------------------------------------------------------------
642 // MethodHandleCompiler::compile
643 //
644 // Compile this MethodHandle into a bytecode adapter and return a
645 // methodOop.
646 methodHandle MethodHandleCompiler::compile(TRAPS) {
647 assert(_thread == THREAD, "must be same thread");
648 methodHandle nullHandle;
649 (void) walk(CHECK_(nullHandle));
650 return get_method_oop(CHECK_(nullHandle));
651 }
652
653
654 void MethodHandleCompiler::emit_bc(Bytecodes::Code op, int index) {
655 Bytecodes::check(op); // Are we legal?
656
657 switch (op) {
658 // b
659 case Bytecodes::_aconst_null:
660 case Bytecodes::_iconst_m1:
661 case Bytecodes::_iconst_0:
662 case Bytecodes::_iconst_1:
663 case Bytecodes::_iconst_2:
664 case Bytecodes::_iconst_3:
665 case Bytecodes::_iconst_4:
666 case Bytecodes::_iconst_5:
667 case Bytecodes::_lconst_0:
668 case Bytecodes::_lconst_1:
669 case Bytecodes::_fconst_0:
670 case Bytecodes::_fconst_1:
671 case Bytecodes::_fconst_2:
672 case Bytecodes::_dconst_0:
673 case Bytecodes::_dconst_1:
674 case Bytecodes::_iload_0:
675 case Bytecodes::_iload_1:
676 case Bytecodes::_iload_2:
677 case Bytecodes::_iload_3:
678 case Bytecodes::_lload_0:
679 case Bytecodes::_lload_1:
680 case Bytecodes::_lload_2:
681 case Bytecodes::_lload_3:
682 case Bytecodes::_fload_0:
683 case Bytecodes::_fload_1:
684 case Bytecodes::_fload_2:
685 case Bytecodes::_fload_3:
686 case Bytecodes::_dload_0:
687 case Bytecodes::_dload_1:
688 case Bytecodes::_dload_2:
689 case Bytecodes::_dload_3:
690 case Bytecodes::_aload_0:
691 case Bytecodes::_aload_1:
692 case Bytecodes::_aload_2:
693 case Bytecodes::_aload_3:
694 case Bytecodes::_istore_0:
695 case Bytecodes::_istore_1:
696 case Bytecodes::_istore_2:
697 case Bytecodes::_istore_3:
698 case Bytecodes::_lstore_0:
699 case Bytecodes::_lstore_1:
700 case Bytecodes::_lstore_2:
701 case Bytecodes::_lstore_3:
702 case Bytecodes::_fstore_0:
703 case Bytecodes::_fstore_1:
704 case Bytecodes::_fstore_2:
705 case Bytecodes::_fstore_3:
706 case Bytecodes::_dstore_0:
707 case Bytecodes::_dstore_1:
708 case Bytecodes::_dstore_2:
709 case Bytecodes::_dstore_3:
710 case Bytecodes::_astore_0:
711 case Bytecodes::_astore_1:
712 case Bytecodes::_astore_2:
713 case Bytecodes::_astore_3:
714 case Bytecodes::_i2l:
715 case Bytecodes::_i2f:
716 case Bytecodes::_i2d:
717 case Bytecodes::_i2b:
718 case Bytecodes::_i2c:
719 case Bytecodes::_i2s:
720 case Bytecodes::_l2i:
721 case Bytecodes::_l2f:
722 case Bytecodes::_l2d:
723 case Bytecodes::_f2i:
724 case Bytecodes::_f2l:
725 case Bytecodes::_f2d:
726 case Bytecodes::_d2i:
727 case Bytecodes::_d2l:
728 case Bytecodes::_d2f:
729 case Bytecodes::_ireturn:
730 case Bytecodes::_lreturn:
731 case Bytecodes::_freturn:
732 case Bytecodes::_dreturn:
733 case Bytecodes::_areturn:
734 case Bytecodes::_return:
735 assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_b, "wrong bytecode format");
736 _bytecode.push(op);
737 break;
738
739 // bi
740 case Bytecodes::_ldc:
741 assert(Bytecodes::format_bits(op, false) == (Bytecodes::_fmt_b|Bytecodes::_fmt_has_k), "wrong bytecode format");
742 assert((char) index == index, "index does not fit in 8-bit");
743 _bytecode.push(op);
744 _bytecode.push(index);
745 break;
746
747 case Bytecodes::_iload:
748 case Bytecodes::_lload:
749 case Bytecodes::_fload:
750 case Bytecodes::_dload:
751 case Bytecodes::_aload:
752 case Bytecodes::_istore:
753 case Bytecodes::_lstore:
754 case Bytecodes::_fstore:
755 case Bytecodes::_dstore:
756 case Bytecodes::_astore:
757 assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bi, "wrong bytecode format");
758 assert((char) index == index, "index does not fit in 8-bit");
759 _bytecode.push(op);
760 _bytecode.push(index);
761 break;
762
763 // bkk
764 case Bytecodes::_ldc_w:
765 case Bytecodes::_ldc2_w:
766 case Bytecodes::_checkcast:
767 assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bkk, "wrong bytecode format");
768 assert((short) index == index, "index does not fit in 16-bit");
769 _bytecode.push(op);
770 _bytecode.push(index >> 8);
771 _bytecode.push(index);
772 break;
773
774 // bJJ
775 case Bytecodes::_invokestatic:
776 case Bytecodes::_invokespecial:
777 case Bytecodes::_invokevirtual:
778 assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bJJ, "wrong bytecode format");
779 assert((short) index == index, "index does not fit in 16-bit");
780 _bytecode.push(op);
781 _bytecode.push(index >> 8);
782 _bytecode.push(index);
783 break;
784
785 default:
786 ShouldNotReachHere();
787 }
788 }
789
790
791 void MethodHandleCompiler::emit_load(BasicType bt, int index) {
792 if (index <= 3) {
793 switch (bt) {
794 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
795 case T_INT: emit_bc(Bytecodes::cast(Bytecodes::_iload_0 + index)); break;
796 case T_LONG: emit_bc(Bytecodes::cast(Bytecodes::_lload_0 + index)); break;
797 case T_FLOAT: emit_bc(Bytecodes::cast(Bytecodes::_fload_0 + index)); break;
798 case T_DOUBLE: emit_bc(Bytecodes::cast(Bytecodes::_dload_0 + index)); break;
799 case T_OBJECT: emit_bc(Bytecodes::cast(Bytecodes::_aload_0 + index)); break;
800 default:
801 ShouldNotReachHere();
802 }
803 }
804 else {
805 switch (bt) {
806 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
807 case T_INT: emit_bc(Bytecodes::_iload, index); break;
808 case T_LONG: emit_bc(Bytecodes::_lload, index); break;
809 case T_FLOAT: emit_bc(Bytecodes::_fload, index); break;
810 case T_DOUBLE: emit_bc(Bytecodes::_dload, index); break;
811 case T_OBJECT: emit_bc(Bytecodes::_aload, index); break;
812 default:
813 ShouldNotReachHere();
814 }
815 }
816 stack_push(bt);
817 }
818
819 void MethodHandleCompiler::emit_store(BasicType bt, int index) {
820 if (index <= 3) {
821 switch (bt) {
822 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
823 case T_INT: emit_bc(Bytecodes::cast(Bytecodes::_istore_0 + index)); break;
824 case T_LONG: emit_bc(Bytecodes::cast(Bytecodes::_lstore_0 + index)); break;
825 case T_FLOAT: emit_bc(Bytecodes::cast(Bytecodes::_fstore_0 + index)); break;
826 case T_DOUBLE: emit_bc(Bytecodes::cast(Bytecodes::_dstore_0 + index)); break;
827 case T_OBJECT: emit_bc(Bytecodes::cast(Bytecodes::_astore_0 + index)); break;
828 default:
829 ShouldNotReachHere();
830 }
831 }
832 else {
833 switch (bt) {
834 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
835 case T_INT: emit_bc(Bytecodes::_istore, index); break;
836 case T_LONG: emit_bc(Bytecodes::_lstore, index); break;
837 case T_FLOAT: emit_bc(Bytecodes::_fstore, index); break;
838 case T_DOUBLE: emit_bc(Bytecodes::_dstore, index); break;
839 case T_OBJECT: emit_bc(Bytecodes::_astore, index); break;
840 default:
841 ShouldNotReachHere();
842 }
843 }
844 stack_pop(bt);
845 }
846
847
848 void MethodHandleCompiler::emit_load_constant(ArgToken arg) {
849 BasicType bt = arg.basic_type();
850 switch (bt) {
851 case T_INT: {
852 jint value = arg.get_jint();
853 if (-1 <= value && value <= 5)
854 emit_bc(Bytecodes::cast(Bytecodes::_iconst_0 + value));
855 else
856 emit_bc(Bytecodes::_ldc, cpool_int_put(value));
857 break;
858 }
859 case T_LONG: {
860 jlong value = arg.get_jlong();
861 if (0 <= value && value <= 1)
862 emit_bc(Bytecodes::cast(Bytecodes::_lconst_0 + (int) value));
863 else
864 emit_bc(Bytecodes::_ldc2_w, cpool_long_put(value));
865 break;
866 }
867 case T_FLOAT: {
868 jfloat value = arg.get_jfloat();
869 if (value == 0.0 || value == 1.0 || value == 2.0)
870 emit_bc(Bytecodes::cast(Bytecodes::_fconst_0 + (int) value));
871 else
872 emit_bc(Bytecodes::_ldc, cpool_float_put(value));
873 break;
874 }
875 case T_DOUBLE: {
876 jdouble value = arg.get_jdouble();
877 if (value == 0.0 || value == 1.0)
878 emit_bc(Bytecodes::cast(Bytecodes::_dconst_0 + (int) value));
879 else
880 emit_bc(Bytecodes::_ldc2_w, cpool_double_put(value));
881 break;
882 }
883 case T_OBJECT: {
884 Handle value = arg.object();
885 if (value.is_null())
886 emit_bc(Bytecodes::_aconst_null);
887 else
888 emit_bc(Bytecodes::_ldc, cpool_object_put(value));
889 break;
890 }
891 default:
892 ShouldNotReachHere();
893 }
894 stack_push(bt);
895 }
896
897
898 MethodHandleWalker::ArgToken
899 MethodHandleCompiler::make_conversion(BasicType type, klassOop tk, Bytecodes::Code op,
900 const ArgToken& src, TRAPS) {
901
902 BasicType srctype = src.basic_type();
903 int index = src.index();
904
905 switch (op) {
906 case Bytecodes::_i2l:
907 case Bytecodes::_i2f:
908 case Bytecodes::_i2d:
909 case Bytecodes::_i2b:
910 case Bytecodes::_i2c:
911 case Bytecodes::_i2s:
912
913 case Bytecodes::_l2i:
914 case Bytecodes::_l2f:
915 case Bytecodes::_l2d:
916
917 case Bytecodes::_f2i:
918 case Bytecodes::_f2l:
919 case Bytecodes::_f2d:
920
921 case Bytecodes::_d2i:
922 case Bytecodes::_d2l:
923 case Bytecodes::_d2f:
924 emit_load(srctype, index);
925 stack_pop(srctype); // pop the src type
926 emit_bc(op);
927 stack_push(type); // push the dest value
928 if (srctype != type)
929 index = new_local_index(type);
930 emit_store(type, index);
931 break;
932
933 case Bytecodes::_checkcast:
934 emit_load(srctype, index);
935 emit_bc(op, cpool_klass_put(tk));
936 emit_store(srctype, index);
937 break;
938
939 default:
940 ShouldNotReachHere();
941 }
942
943 return make_parameter(type, tk, index, THREAD);
944 }
945
946
947 // -----------------------------------------------------------------------------
948 // MethodHandleCompiler
949 //
950
951 static jvalue zero_jvalue;
952
953 // Emit bytecodes for the given invoke instruction.
954 MethodHandleWalker::ArgToken
955 MethodHandleCompiler::make_invoke(methodOop m, vmIntrinsics::ID iid,
956 Bytecodes::Code op, bool tailcall,
957 int argc, MethodHandleWalker::ArgToken* argv,
958 TRAPS) {
959 if (m == NULL) {
960 // Get the intrinsic methodOop.
961 m = vmIntrinsics::method_for(iid);
962 if (m == NULL && iid == vmIntrinsics::_checkSpreadArgument && AllowTransitionalJSR292) {
963 m = vmIntrinsics::method_for(vmIntrinsics::_checkSpreadArgument_TRANS);
964 }
965 if (m == NULL) {
966 ArgToken zero;
967 lose(vmIntrinsics::name_at(iid), CHECK_(zero));
968 }
969 }
970
971 klassOop klass = m->method_holder();
972 Symbol* name = m->name();
973 Symbol* signature = m->signature();
974
975 if (tailcall) {
976 // Actually, in order to make these methods more recognizable,
977 // let's put them in holder class MethodHandle. That way stack
978 // walkers and compiler heuristics can recognize them.
979 _target_klass = SystemDictionary::MethodHandle_klass();
980 }
981
982 // Inline the method.
983 InvocationCounter* ic = m->invocation_counter();
984 ic->set_carry_flag();
985
986 for (int i = 0; i < argc; i++) {
987 ArgToken arg = argv[i];
988 TokenType tt = arg.token_type();
989 BasicType bt = arg.basic_type();
990
991 switch (tt) {
992 case tt_parameter:
993 case tt_temporary:
994 emit_load(bt, arg.index());
995 break;
996 case tt_constant:
997 emit_load_constant(arg);
998 break;
999 case tt_illegal:
1000 // Sentinel.
1001 assert(i == (argc - 1), "sentinel must be last entry");
1002 break;
1003 case tt_void:
1004 default:
1005 ShouldNotReachHere();
1006 }
1007 }
1008
1009 // Populate constant pool.
1010 int name_index = cpool_symbol_put(name);
1011 int signature_index = cpool_symbol_put(signature);
1012 int name_and_type_index = cpool_name_and_type_put(name_index, signature_index);
1013 int klass_index = cpool_klass_put(klass);
1014 int methodref_index = cpool_methodref_put(klass_index, name_and_type_index);
1015
1016 // Generate invoke.
1017 switch (op) {
1018 case Bytecodes::_invokestatic:
1019 case Bytecodes::_invokespecial:
1020 case Bytecodes::_invokevirtual:
1021 emit_bc(op, methodref_index);
1022 break;
1023 case Bytecodes::_invokeinterface:
1024 Unimplemented();
1025 break;
1026 default:
1027 ShouldNotReachHere();
1028 }
1029
1030 // If tailcall, we have walked all the way to a direct method handle.
1031 // Otherwise, make a recursive call to some helper routine.
1032 BasicType rbt = m->result_type();
1033 if (rbt == T_ARRAY) rbt = T_OBJECT;
1034 ArgToken ret;
1035 if (tailcall) {
1036 if (rbt != _rtype) {
1037 if (rbt == T_VOID) {
1038 // push a zero of the right sort
1039 ArgToken zero;
1040 if (_rtype == T_OBJECT) {
1041 zero = make_oop_constant(NULL, CHECK_(zero));
1042 } else {
1043 zero = make_prim_constant(_rtype, &zero_jvalue, CHECK_(zero));
1044 }
1045 emit_load_constant(zero);
1046 } else if (_rtype == T_VOID) {
1047 // We'll emit a _return with something on the stack.
1048 // It's OK to ignore what's on the stack.
1049 } else {
1050 tty->print_cr("*** rbt=%d != rtype=%d", rbt, _rtype);
1051 assert(false, "IMPLEMENT ME");
1052 }
1053 }
1054 switch (_rtype) {
1055 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
1056 case T_INT: emit_bc(Bytecodes::_ireturn); break;
1057 case T_LONG: emit_bc(Bytecodes::_lreturn); break;
1058 case T_FLOAT: emit_bc(Bytecodes::_freturn); break;
1059 case T_DOUBLE: emit_bc(Bytecodes::_dreturn); break;
1060 case T_VOID: emit_bc(Bytecodes::_return); break;
1061 case T_OBJECT:
1062 if (_rklass.not_null() && _rklass() != SystemDictionary::Object_klass())
1063 emit_bc(Bytecodes::_checkcast, cpool_klass_put(_rklass()));
1064 emit_bc(Bytecodes::_areturn);
1065 break;
1066 default: ShouldNotReachHere();
1067 }
1068 ret = ArgToken(); // Dummy return value.
1069 }
1070 else {
1071 stack_push(rbt); // The return value is already pushed onto the stack.
1072 int index = new_local_index(rbt);
1073 switch (rbt) {
1074 case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
1075 case T_INT: case T_LONG: case T_FLOAT: case T_DOUBLE:
1076 case T_OBJECT:
1077 emit_store(rbt, index);
1078 ret = ArgToken(tt_temporary, rbt, index);
1079 break;
1080 case T_VOID:
1081 ret = ArgToken(tt_void);
1082 break;
1083 default:
1084 ShouldNotReachHere();
1085 }
1086 }
1087
1088 return ret;
1089 }
1090
1091 MethodHandleWalker::ArgToken
1092 MethodHandleCompiler::make_fetch(BasicType type, klassOop tk, Bytecodes::Code op,
1093 const MethodHandleWalker::ArgToken& base,
1094 const MethodHandleWalker::ArgToken& offset,
1095 TRAPS) {
1096 Unimplemented();
1097 return ArgToken();
1098 }
1099
1100
1101 int MethodHandleCompiler::cpool_primitive_put(BasicType bt, jvalue* con) {
1102 jvalue con_copy;
1103 assert(bt < T_OBJECT, "");
1104 if (type2aelembytes(bt) < jintSize) {
1105 // widen to int
1106 con_copy = (*con);
1107 con = &con_copy;
1108 switch (bt) {
1109 case T_BOOLEAN: con->i = (con->z ? 1 : 0); break;
1110 case T_BYTE: con->i = con->b; break;
1111 case T_CHAR: con->i = con->c; break;
1112 case T_SHORT: con->i = con->s; break;
1113 default: ShouldNotReachHere();
1114 }
1115 bt = T_INT;
1116 }
1117
1118 // for (int i = 1, imax = _constants.length(); i < imax; i++) {
1119 // ConstantValue* con = _constants.at(i);
1120 // if (con != NULL && con->is_primitive() && con->_type == bt) {
1121 // bool match = false;
1122 // switch (type2size[bt]) {
1123 // case 1: if (pcon->_value.i == con->i) match = true; break;
1124 // case 2: if (pcon->_value.j == con->j) match = true; break;
1125 // }
1126 // if (match)
1127 // return i;
1128 // }
1129 // }
1130 ConstantValue* cv = new ConstantValue(bt, *con);
1131 int index = _constants.append(cv);
1132
1133 // long and double entries take 2 slots, we add another empty entry.
1134 if (type2size[bt] == 2)
1135 (void) _constants.append(NULL);
1136
1137 return index;
1138 }
1139
1140
1141 constantPoolHandle MethodHandleCompiler::get_constant_pool(TRAPS) const {
1142 constantPoolHandle nullHandle;
1143 constantPoolOop cpool_oop = oopFactory::new_constantPool(_constants.length(),
1144 oopDesc::IsSafeConc,
1145 CHECK_(nullHandle));
1146 constantPoolHandle cpool(THREAD, cpool_oop);
1147
1148 // Fill the real constant pool skipping the zero element.
1149 for (int i = 1; i < _constants.length(); i++) {
1150 ConstantValue* cv = _constants.at(i);
1151 switch (cv->tag()) {
1152 case JVM_CONSTANT_Utf8: cpool->symbol_at_put( i, cv->symbol() ); break;
1153 case JVM_CONSTANT_Integer: cpool->int_at_put( i, cv->get_jint() ); break;
1154 case JVM_CONSTANT_Float: cpool->float_at_put( i, cv->get_jfloat() ); break;
1155 case JVM_CONSTANT_Long: cpool->long_at_put( i, cv->get_jlong() ); break;
1156 case JVM_CONSTANT_Double: cpool->double_at_put( i, cv->get_jdouble() ); break;
1157 case JVM_CONSTANT_Class: cpool->klass_at_put( i, cv->klass_oop() ); break;
1158 case JVM_CONSTANT_Methodref: cpool->method_at_put( i, cv->first_index(), cv->second_index()); break;
1159 case JVM_CONSTANT_NameAndType: cpool->name_and_type_at_put(i, cv->first_index(), cv->second_index()); break;
1160 case JVM_CONSTANT_Object: cpool->object_at_put( i, cv->object_oop() ); break;
1161 default: ShouldNotReachHere();
1162 }
1163
1164 switch (cv->tag()) {
1165 case JVM_CONSTANT_Long:
1166 case JVM_CONSTANT_Double:
1167 i++; // Skip empty entry.
1168 assert(_constants.at(i) == NULL, "empty entry");
1169 break;
1170 }
1171 }
1172
1173 // Set the constant pool holder to the target method's class.
1174 cpool->set_pool_holder(_target_klass());
1175
1176 return cpool;
1177 }
1178
1179
1180 methodHandle MethodHandleCompiler::get_method_oop(TRAPS) const {
1181 methodHandle nullHandle;
1182 // Create a method that holds the generated bytecode. invokedynamic
1183 // has no receiver, normal MH calls do.
1184 int flags_bits;
1185 if (for_invokedynamic())
1186 flags_bits = (/*JVM_MH_INVOKE_BITS |*/ JVM_ACC_PUBLIC | JVM_ACC_FINAL | JVM_ACC_SYNTHETIC | JVM_ACC_STATIC);
1187 else
1188 flags_bits = (/*JVM_MH_INVOKE_BITS |*/ JVM_ACC_PUBLIC | JVM_ACC_FINAL | JVM_ACC_SYNTHETIC);
1189
1190 methodOop m_oop = oopFactory::new_method(bytecode_length(),
1191 accessFlags_from(flags_bits),
1192 0, 0, 0, oopDesc::IsSafeConc, CHECK_(nullHandle));
1193 methodHandle m(THREAD, m_oop);
1194 m_oop = NULL; // oop not GC safe
1195
1196 constantPoolHandle cpool = get_constant_pool(CHECK_(nullHandle));
1197 m->set_constants(cpool());
1198
1199 m->set_name_index(_name_index);
1200 m->set_signature_index(_signature_index);
1201
1202 m->set_code((address) bytecode());
1203
1204 m->set_max_stack(_max_stack);
1205 m->set_max_locals(max_locals());
1206 m->set_size_of_parameters(_num_params);
1207
1208 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1209 m->set_exception_table(exception_handlers());
1210
1211 // Set the carry bit of the invocation counter to force inlining of
1212 // the adapter.
1213 InvocationCounter* ic = m->invocation_counter();
1214 ic->set_carry_flag();
1215
1216 // Rewrite the method and set up the constant pool cache.
1217 objArrayOop m_array = oopFactory::new_system_objArray(1, CHECK_(nullHandle));
1218 objArrayHandle methods(THREAD, m_array);
1219 methods->obj_at_put(0, m());
1220 Rewriter::rewrite(_target_klass(), cpool, methods, CHECK_(nullHandle)); // Use fake class.
1221
1222 #ifndef PRODUCT
1223 if (TraceMethodHandles) {
1224 m->print();
1225 m->print_codes();
1226 }
1227 #endif //PRODUCT
1228
1229 assert(m->is_method_handle_adapter(), "must be recognized as an adapter");
1230 return m;
1231 }
1232
1233
1234 #ifndef PRODUCT
1235
1236 #if 0
1237 // MH printer for debugging.
1238
1239 class MethodHandlePrinter : public MethodHandleWalker {
1240 private:
1241 outputStream* _out;
1242 bool _verbose;
1243 int _temp_num;
1244 stringStream _strbuf;
1245 const char* strbuf() {
1246 const char* s = _strbuf.as_string();
1247 _strbuf.reset();
1248 return s;
1249 }
1250 ArgToken token(const char* str) {
1251 return (ArgToken) str;
1252 }
1253 void start_params() {
1254 _out->print("(");
1255 }
1256 void end_params() {
1257 if (_verbose) _out->print("\n");
1258 _out->print(") => {");
1259 }
1260 void put_type_name(BasicType type, klassOop tk, outputStream* s) {
1261 const char* kname = NULL;
1262 if (tk != NULL)
1263 kname = Klass::cast(tk)->external_name();
1264 s->print("%s", (kname != NULL) ? kname : type2name(type));
1265 }
1266 ArgToken maybe_make_temp(const char* statement_op, BasicType type, const char* temp_name) {
1267 const char* value = strbuf();
1268 if (!_verbose) return token(value);
1269 // make an explicit binding for each separate value
1270 _strbuf.print("%s%d", temp_name, ++_temp_num);
1271 const char* temp = strbuf();
1272 _out->print("\n %s %s %s = %s;", statement_op, type2name(type), temp, value);
1273 return token(temp);
1274 }
1275
1276 public:
1277 MethodHandlePrinter(Handle root, bool verbose, outputStream* out, TRAPS)
1278 : MethodHandleWalker(root, THREAD),
1279 _out(out),
1280 _verbose(verbose),
1281 _temp_num(0)
1282 {
1283 start_params();
1284 }
1285 virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
1286 if (argnum < 0) {
1287 end_params();
1288 return NULL;
1289 }
1290 if (argnum == 0) {
1291 _out->print(_verbose ? "\n " : "");
1292 } else {
1293 _out->print(_verbose ? ",\n " : ", ");
1294 }
1295 if (argnum >= _temp_num)
1296 _temp_num = argnum;
1297 // generate an argument name
1298 _strbuf.print("a%d", argnum);
1299 const char* arg = strbuf();
1300 put_type_name(type, tk, _out);
1301 _out->print(" %s", arg);
1302 return token(arg);
1303 }
1304 virtual ArgToken make_oop_constant(oop con, TRAPS) {
1305 if (con == NULL)
1306 _strbuf.print("null");
1307 else
1308 con->print_value_on(&_strbuf);
1309 if (_strbuf.size() == 0) { // yuck
1310 _strbuf.print("(a ");
1311 put_type_name(T_OBJECT, con->klass(), &_strbuf);
1312 _strbuf.print(")");
1313 }
1314 return maybe_make_temp("constant", T_OBJECT, "k");
1315 }
1316 virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
1317 java_lang_boxing_object::print(type, con, &_strbuf);
1318 return maybe_make_temp("constant", type, "k");
1319 }
1320 virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS) {
1321 _strbuf.print("%s(%s", Bytecodes::name(op), (const char*)src);
1322 if (tk != NULL) {
1323 _strbuf.print(", ");
1324 put_type_name(type, tk, &_strbuf);
1325 }
1326 _strbuf.print(")");
1327 return maybe_make_temp("convert", type, "v");
1328 }
1329 virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS) {
1330 _strbuf.print("%s(%s, %s", Bytecodes::name(op), (const char*)base, (const char*)offset);
1331 if (tk != NULL) {
1332 _strbuf.print(", ");
1333 put_type_name(type, tk, &_strbuf);
1334 }
1335 _strbuf.print(")");
1336 return maybe_make_temp("fetch", type, "x");
1337 }
1338 virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid,
1339 Bytecodes::Code op, bool tailcall,
1340 int argc, ArgToken* argv, TRAPS) {
1341 Symbol* name, sig;
1342 if (m != NULL) {
1343 name = m->name();
1344 sig = m->signature();
1345 } else {
1346 name = vmSymbols::symbol_at(vmIntrinsics::name_for(iid));
1347 sig = vmSymbols::symbol_at(vmIntrinsics::signature_for(iid));
1348 }
1349 _strbuf.print("%s %s%s(", Bytecodes::name(op), name->as_C_string(), sig->as_C_string());
1350 for (int i = 0; i < argc; i++) {
1351 _strbuf.print("%s%s", (i > 0 ? ", " : ""), (const char*)argv[i]);
1352 }
1353 _strbuf.print(")");
1354 if (!tailcall) {
1355 BasicType rt = char2type(sig->byte_at(sig->utf8_length()-1));
1356 if (rt == T_ILLEGAL) rt = T_OBJECT; // ';' at the end of '(...)L...;'
1357 return maybe_make_temp("invoke", rt, "x");
1358 } else {
1359 const char* ret = strbuf();
1360 _out->print(_verbose ? "\n return " : " ");
1361 _out->print("%s", ret);
1362 _out->print(_verbose ? "\n}\n" : " }");
1363 }
1364 return ArgToken();
1365 }
1366
1367 virtual void set_method_handle(oop mh) {
1368 if (WizardMode && Verbose) {
1369 tty->print("\n--- next target: ");
1370 mh->print();
1371 }
1372 }
1373
1374 static void print(Handle root, bool verbose, outputStream* out, TRAPS) {
1375 ResourceMark rm;
1376 MethodHandlePrinter printer(root, verbose, out, CHECK);
1377 printer.walk(CHECK);
1378 out->print("\n");
1379 }
1380 static void print(Handle root, bool verbose = Verbose, outputStream* out = tty) {
1381 EXCEPTION_MARK;
1382 ResourceMark rm;
1383 MethodHandlePrinter printer(root, verbose, out, THREAD);
1384 if (!HAS_PENDING_EXCEPTION)
1385 printer.walk(THREAD);
1386 if (HAS_PENDING_EXCEPTION) {
1387 oop ex = PENDING_EXCEPTION;
1388 CLEAR_PENDING_EXCEPTION;
1389 out->print("\n*** ");
1390 if (ex != Universe::virtual_machine_error_instance())
1391 ex->print_on(out);
1392 else
1393 out->print("lose: %s", printer.lose_message());
1394 out->print("\n}\n");
1395 }
1396 out->print("\n");
1397 }
1398 };
1399 #endif // 0
1400
1401 extern "C"
1402 void print_method_handle(oop mh) {
1403 if (!mh->is_oop()) {
1404 tty->print_cr("*** not a method handle: "INTPTR_FORMAT, (intptr_t)mh);
1405 } else if (java_dyn_MethodHandle::is_instance(mh)) {
1406 //MethodHandlePrinter::print(mh);
1407 } else {
1408 tty->print("*** not a method handle: ");
1409 mh->print();
1410 }
1411 }
1412
1413 #endif // PRODUCT