1 /*
2 * Copyright (c) 1997, 2016, 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 "asm/macroAssembler.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "ci/ciReplay.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "code/exceptionHandlerTable.hpp"
31 #include "code/nmethod.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compileLog.hpp"
34 #include "compiler/disassembler.hpp"
35 #include "compiler/oopMap.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "opto/addnode.hpp"
38 #include "opto/block.hpp"
39 #include "opto/c2compiler.hpp"
40 #include "opto/callGenerator.hpp"
41 #include "opto/callnode.hpp"
42 #include "opto/castnode.hpp"
43 #include "opto/cfgnode.hpp"
44 #include "opto/chaitin.hpp"
45 #include "opto/compile.hpp"
46 #include "opto/connode.hpp"
47 #include "opto/convertnode.hpp"
48 #include "opto/divnode.hpp"
49 #include "opto/escape.hpp"
50 #include "opto/idealGraphPrinter.hpp"
51 #include "opto/loopnode.hpp"
52 #include "opto/machnode.hpp"
53 #include "opto/macro.hpp"
54 #include "opto/matcher.hpp"
55 #include "opto/mathexactnode.hpp"
56 #include "opto/memnode.hpp"
57 #include "opto/mulnode.hpp"
58 #include "opto/narrowptrnode.hpp"
59 #include "opto/node.hpp"
60 #include "opto/opcodes.hpp"
61 #include "opto/output.hpp"
62 #include "opto/parse.hpp"
63 #include "opto/phaseX.hpp"
64 #include "opto/rootnode.hpp"
65 #include "opto/runtime.hpp"
66 #include "opto/stringopts.hpp"
67 #include "opto/type.hpp"
68 #include "opto/valuetypenode.hpp"
69 #include "opto/vectornode.hpp"
70 #include "runtime/arguments.hpp"
71 #include "runtime/sharedRuntime.hpp"
72 #include "runtime/signature.hpp"
73 #include "runtime/stubRoutines.hpp"
74 #include "runtime/timer.hpp"
75 #include "utilities/copy.hpp"
76
77
78 // -------------------- Compile::mach_constant_base_node -----------------------
79 // Constant table base node singleton.
80 MachConstantBaseNode* Compile::mach_constant_base_node() {
81 if (_mach_constant_base_node == NULL) {
82 _mach_constant_base_node = new MachConstantBaseNode();
83 _mach_constant_base_node->add_req(C->root());
84 }
85 return _mach_constant_base_node;
86 }
87
88
89 /// Support for intrinsics.
90
91 // Return the index at which m must be inserted (or already exists).
92 // The sort order is by the address of the ciMethod, with is_virtual as minor key.
93 class IntrinsicDescPair {
94 private:
95 ciMethod* _m;
96 bool _is_virtual;
97 public:
98 IntrinsicDescPair(ciMethod* m, bool is_virtual) : _m(m), _is_virtual(is_virtual) {}
99 static int compare(IntrinsicDescPair* const& key, CallGenerator* const& elt) {
100 ciMethod* m= elt->method();
101 ciMethod* key_m = key->_m;
102 if (key_m < m) return -1;
103 else if (key_m > m) return 1;
104 else {
105 bool is_virtual = elt->is_virtual();
106 bool key_virtual = key->_is_virtual;
107 if (key_virtual < is_virtual) return -1;
108 else if (key_virtual > is_virtual) return 1;
109 else return 0;
110 }
111 }
112 };
113 int Compile::intrinsic_insertion_index(ciMethod* m, bool is_virtual, bool& found) {
114 #ifdef ASSERT
115 for (int i = 1; i < _intrinsics->length(); i++) {
116 CallGenerator* cg1 = _intrinsics->at(i-1);
117 CallGenerator* cg2 = _intrinsics->at(i);
118 assert(cg1->method() != cg2->method()
119 ? cg1->method() < cg2->method()
120 : cg1->is_virtual() < cg2->is_virtual(),
121 "compiler intrinsics list must stay sorted");
122 }
123 #endif
124 IntrinsicDescPair pair(m, is_virtual);
125 return _intrinsics->find_sorted<IntrinsicDescPair*, IntrinsicDescPair::compare>(&pair, found);
126 }
127
128 void Compile::register_intrinsic(CallGenerator* cg) {
129 if (_intrinsics == NULL) {
130 _intrinsics = new (comp_arena())GrowableArray<CallGenerator*>(comp_arena(), 60, 0, NULL);
131 }
132 int len = _intrinsics->length();
133 bool found = false;
134 int index = intrinsic_insertion_index(cg->method(), cg->is_virtual(), found);
135 assert(!found, "registering twice");
136 _intrinsics->insert_before(index, cg);
137 assert(find_intrinsic(cg->method(), cg->is_virtual()) == cg, "registration worked");
138 }
139
140 CallGenerator* Compile::find_intrinsic(ciMethod* m, bool is_virtual) {
141 assert(m->is_loaded(), "don't try this on unloaded methods");
142 if (_intrinsics != NULL) {
143 bool found = false;
144 int index = intrinsic_insertion_index(m, is_virtual, found);
145 if (found) {
146 return _intrinsics->at(index);
147 }
148 }
149 // Lazily create intrinsics for intrinsic IDs well-known in the runtime.
150 if (m->intrinsic_id() != vmIntrinsics::_none &&
151 m->intrinsic_id() <= vmIntrinsics::LAST_COMPILER_INLINE) {
152 CallGenerator* cg = make_vm_intrinsic(m, is_virtual);
153 if (cg != NULL) {
154 // Save it for next time:
155 register_intrinsic(cg);
156 return cg;
157 } else {
158 gather_intrinsic_statistics(m->intrinsic_id(), is_virtual, _intrinsic_disabled);
159 }
160 }
161 return NULL;
162 }
163
164 // Compile:: register_library_intrinsics and make_vm_intrinsic are defined
165 // in library_call.cpp.
166
167
168 #ifndef PRODUCT
169 // statistics gathering...
170
171 juint Compile::_intrinsic_hist_count[vmIntrinsics::ID_LIMIT] = {0};
172 jubyte Compile::_intrinsic_hist_flags[vmIntrinsics::ID_LIMIT] = {0};
173
174 bool Compile::gather_intrinsic_statistics(vmIntrinsics::ID id, bool is_virtual, int flags) {
175 assert(id > vmIntrinsics::_none && id < vmIntrinsics::ID_LIMIT, "oob");
176 int oflags = _intrinsic_hist_flags[id];
177 assert(flags != 0, "what happened?");
178 if (is_virtual) {
179 flags |= _intrinsic_virtual;
180 }
181 bool changed = (flags != oflags);
182 if ((flags & _intrinsic_worked) != 0) {
183 juint count = (_intrinsic_hist_count[id] += 1);
184 if (count == 1) {
185 changed = true; // first time
186 }
187 // increment the overall count also:
188 _intrinsic_hist_count[vmIntrinsics::_none] += 1;
189 }
190 if (changed) {
191 if (((oflags ^ flags) & _intrinsic_virtual) != 0) {
192 // Something changed about the intrinsic's virtuality.
193 if ((flags & _intrinsic_virtual) != 0) {
194 // This is the first use of this intrinsic as a virtual call.
195 if (oflags != 0) {
196 // We already saw it as a non-virtual, so note both cases.
197 flags |= _intrinsic_both;
198 }
199 } else if ((oflags & _intrinsic_both) == 0) {
200 // This is the first use of this intrinsic as a non-virtual
201 flags |= _intrinsic_both;
202 }
203 }
204 _intrinsic_hist_flags[id] = (jubyte) (oflags | flags);
205 }
206 // update the overall flags also:
207 _intrinsic_hist_flags[vmIntrinsics::_none] |= (jubyte) flags;
208 return changed;
209 }
210
211 static char* format_flags(int flags, char* buf) {
212 buf[0] = 0;
213 if ((flags & Compile::_intrinsic_worked) != 0) strcat(buf, ",worked");
214 if ((flags & Compile::_intrinsic_failed) != 0) strcat(buf, ",failed");
215 if ((flags & Compile::_intrinsic_disabled) != 0) strcat(buf, ",disabled");
216 if ((flags & Compile::_intrinsic_virtual) != 0) strcat(buf, ",virtual");
217 if ((flags & Compile::_intrinsic_both) != 0) strcat(buf, ",nonvirtual");
218 if (buf[0] == 0) strcat(buf, ",");
219 assert(buf[0] == ',', "must be");
220 return &buf[1];
221 }
222
223 void Compile::print_intrinsic_statistics() {
224 char flagsbuf[100];
225 ttyLocker ttyl;
226 if (xtty != NULL) xtty->head("statistics type='intrinsic'");
227 tty->print_cr("Compiler intrinsic usage:");
228 juint total = _intrinsic_hist_count[vmIntrinsics::_none];
229 if (total == 0) total = 1; // avoid div0 in case of no successes
230 #define PRINT_STAT_LINE(name, c, f) \
231 tty->print_cr(" %4d (%4.1f%%) %s (%s)", (int)(c), ((c) * 100.0) / total, name, f);
232 for (int index = 1 + (int)vmIntrinsics::_none; index < (int)vmIntrinsics::ID_LIMIT; index++) {
233 vmIntrinsics::ID id = (vmIntrinsics::ID) index;
234 int flags = _intrinsic_hist_flags[id];
235 juint count = _intrinsic_hist_count[id];
236 if ((flags | count) != 0) {
237 PRINT_STAT_LINE(vmIntrinsics::name_at(id), count, format_flags(flags, flagsbuf));
238 }
239 }
240 PRINT_STAT_LINE("total", total, format_flags(_intrinsic_hist_flags[vmIntrinsics::_none], flagsbuf));
241 if (xtty != NULL) xtty->tail("statistics");
242 }
243
244 void Compile::print_statistics() {
245 { ttyLocker ttyl;
246 if (xtty != NULL) xtty->head("statistics type='opto'");
247 Parse::print_statistics();
248 PhaseCCP::print_statistics();
249 PhaseRegAlloc::print_statistics();
250 Scheduling::print_statistics();
251 PhasePeephole::print_statistics();
252 PhaseIdealLoop::print_statistics();
253 if (xtty != NULL) xtty->tail("statistics");
254 }
255 if (_intrinsic_hist_flags[vmIntrinsics::_none] != 0) {
256 // put this under its own <statistics> element.
257 print_intrinsic_statistics();
258 }
259 }
260 #endif //PRODUCT
261
262 // Support for bundling info
263 Bundle* Compile::node_bundling(const Node *n) {
264 assert(valid_bundle_info(n), "oob");
265 return &_node_bundling_base[n->_idx];
266 }
267
268 bool Compile::valid_bundle_info(const Node *n) {
269 return (_node_bundling_limit > n->_idx);
270 }
271
272
273 void Compile::gvn_replace_by(Node* n, Node* nn) {
274 for (DUIterator_Last imin, i = n->last_outs(imin); i >= imin; ) {
275 Node* use = n->last_out(i);
276 bool is_in_table = initial_gvn()->hash_delete(use);
277 uint uses_found = 0;
278 for (uint j = 0; j < use->len(); j++) {
279 if (use->in(j) == n) {
280 if (j < use->req())
281 use->set_req(j, nn);
282 else
283 use->set_prec(j, nn);
284 uses_found++;
285 }
286 }
287 if (is_in_table) {
288 // reinsert into table
289 initial_gvn()->hash_find_insert(use);
290 }
291 record_for_igvn(use);
292 i -= uses_found; // we deleted 1 or more copies of this edge
293 }
294 }
295
296
297 static inline bool not_a_node(const Node* n) {
298 if (n == NULL) return true;
299 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc.
300 if (*(address*)n == badAddress) return true; // kill by Node::destruct
301 return false;
302 }
303
304 // Identify all nodes that are reachable from below, useful.
305 // Use breadth-first pass that records state in a Unique_Node_List,
306 // recursive traversal is slower.
307 void Compile::identify_useful_nodes(Unique_Node_List &useful) {
308 int estimated_worklist_size = live_nodes();
309 useful.map( estimated_worklist_size, NULL ); // preallocate space
310
311 // Initialize worklist
312 if (root() != NULL) { useful.push(root()); }
313 // If 'top' is cached, declare it useful to preserve cached node
314 if( cached_top_node() ) { useful.push(cached_top_node()); }
315
316 // Push all useful nodes onto the list, breadthfirst
317 for( uint next = 0; next < useful.size(); ++next ) {
318 assert( next < unique(), "Unique useful nodes < total nodes");
319 Node *n = useful.at(next);
320 uint max = n->len();
321 for( uint i = 0; i < max; ++i ) {
322 Node *m = n->in(i);
323 if (not_a_node(m)) continue;
324 useful.push(m);
325 }
326 }
327 }
328
329 // Update dead_node_list with any missing dead nodes using useful
330 // list. Consider all non-useful nodes to be useless i.e., dead nodes.
331 void Compile::update_dead_node_list(Unique_Node_List &useful) {
332 uint max_idx = unique();
333 VectorSet& useful_node_set = useful.member_set();
334
335 for (uint node_idx = 0; node_idx < max_idx; node_idx++) {
336 // If node with index node_idx is not in useful set,
337 // mark it as dead in dead node list.
338 if (! useful_node_set.test(node_idx) ) {
339 record_dead_node(node_idx);
340 }
341 }
342 }
343
344 void Compile::remove_useless_late_inlines(GrowableArray<CallGenerator*>* inlines, Unique_Node_List &useful) {
345 int shift = 0;
346 for (int i = 0; i < inlines->length(); i++) {
347 CallGenerator* cg = inlines->at(i);
348 CallNode* call = cg->call_node();
349 if (shift > 0) {
350 inlines->at_put(i-shift, cg);
351 }
352 if (!useful.member(call)) {
353 shift++;
354 }
355 }
356 inlines->trunc_to(inlines->length()-shift);
357 }
358
359 // Disconnect all useless nodes by disconnecting those at the boundary.
360 void Compile::remove_useless_nodes(Unique_Node_List &useful) {
361 uint next = 0;
362 while (next < useful.size()) {
363 Node *n = useful.at(next++);
364 if (n->is_SafePoint()) {
365 // We're done with a parsing phase. Replaced nodes are not valid
366 // beyond that point.
367 n->as_SafePoint()->delete_replaced_nodes();
368 }
369 // Use raw traversal of out edges since this code removes out edges
370 int max = n->outcnt();
371 for (int j = 0; j < max; ++j) {
372 Node* child = n->raw_out(j);
373 if (! useful.member(child)) {
374 assert(!child->is_top() || child != top(),
375 "If top is cached in Compile object it is in useful list");
376 // Only need to remove this out-edge to the useless node
377 n->raw_del_out(j);
378 --j;
379 --max;
380 }
381 }
382 if (n->outcnt() == 1 && n->has_special_unique_user()) {
383 record_for_igvn(n->unique_out());
384 }
385 }
386 // Remove useless macro and predicate opaq nodes
387 for (int i = C->macro_count()-1; i >= 0; i--) {
388 Node* n = C->macro_node(i);
389 if (!useful.member(n)) {
390 remove_macro_node(n);
391 }
392 }
393 // Remove useless CastII nodes with range check dependency
394 for (int i = range_check_cast_count() - 1; i >= 0; i--) {
395 Node* cast = range_check_cast_node(i);
396 if (!useful.member(cast)) {
397 remove_range_check_cast(cast);
398 }
399 }
400 // Remove useless expensive node
401 for (int i = C->expensive_count()-1; i >= 0; i--) {
402 Node* n = C->expensive_node(i);
403 if (!useful.member(n)) {
404 remove_expensive_node(n);
405 }
406 }
407 for (int i = value_type_ptr_count() - 1; i >= 0; i--) {
408 ValueTypePtrNode* vtptr = value_type_ptr(i);
409 if (!useful.member(vtptr)) {
410 remove_value_type_ptr(vtptr);
411 }
412 }
413 // clean up the late inline lists
414 remove_useless_late_inlines(&_string_late_inlines, useful);
415 remove_useless_late_inlines(&_boxing_late_inlines, useful);
416 remove_useless_late_inlines(&_late_inlines, useful);
417 debug_only(verify_graph_edges(true/*check for no_dead_code*/);)
418 }
419
420 //------------------------------frame_size_in_words-----------------------------
421 // frame_slots in units of words
422 int Compile::frame_size_in_words() const {
423 // shift is 0 in LP32 and 1 in LP64
424 const int shift = (LogBytesPerWord - LogBytesPerInt);
425 int words = _frame_slots >> shift;
426 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" );
427 return words;
428 }
429
430 // To bang the stack of this compiled method we use the stack size
431 // that the interpreter would need in case of a deoptimization. This
432 // removes the need to bang the stack in the deoptimization blob which
433 // in turn simplifies stack overflow handling.
434 int Compile::bang_size_in_bytes() const {
435 return MAX2(frame_size_in_bytes() + os::extra_bang_size_in_bytes(), _interpreter_frame_size);
436 }
437
438 // ============================================================================
439 //------------------------------CompileWrapper---------------------------------
440 class CompileWrapper : public StackObj {
441 Compile *const _compile;
442 public:
443 CompileWrapper(Compile* compile);
444
445 ~CompileWrapper();
446 };
447
448 CompileWrapper::CompileWrapper(Compile* compile) : _compile(compile) {
449 // the Compile* pointer is stored in the current ciEnv:
450 ciEnv* env = compile->env();
451 assert(env == ciEnv::current(), "must already be a ciEnv active");
452 assert(env->compiler_data() == NULL, "compile already active?");
453 env->set_compiler_data(compile);
454 assert(compile == Compile::current(), "sanity");
455
456 compile->set_type_dict(NULL);
457 compile->set_clone_map(new Dict(cmpkey, hashkey, _compile->comp_arena()));
458 compile->clone_map().set_clone_idx(0);
459 compile->set_type_hwm(NULL);
460 compile->set_type_last_size(0);
461 compile->set_last_tf(NULL, NULL);
462 compile->set_indexSet_arena(NULL);
463 compile->set_indexSet_free_block_list(NULL);
464 compile->init_type_arena();
465 Type::Initialize(compile);
466 _compile->set_scratch_buffer_blob(NULL);
467 _compile->begin_method();
468 _compile->clone_map().set_debug(_compile->has_method() && _compile->directive()->CloneMapDebugOption);
469 }
470 CompileWrapper::~CompileWrapper() {
471 _compile->end_method();
472 if (_compile->scratch_buffer_blob() != NULL)
473 BufferBlob::free(_compile->scratch_buffer_blob());
474 _compile->env()->set_compiler_data(NULL);
475 }
476
477
478 //----------------------------print_compile_messages---------------------------
479 void Compile::print_compile_messages() {
480 #ifndef PRODUCT
481 // Check if recompiling
482 if (_subsume_loads == false && PrintOpto) {
483 // Recompiling without allowing machine instructions to subsume loads
484 tty->print_cr("*********************************************************");
485 tty->print_cr("** Bailout: Recompile without subsuming loads **");
486 tty->print_cr("*********************************************************");
487 }
488 if (_do_escape_analysis != DoEscapeAnalysis && PrintOpto) {
489 // Recompiling without escape analysis
490 tty->print_cr("*********************************************************");
491 tty->print_cr("** Bailout: Recompile without escape analysis **");
492 tty->print_cr("*********************************************************");
493 }
494 if (_eliminate_boxing != EliminateAutoBox && PrintOpto) {
495 // Recompiling without boxing elimination
496 tty->print_cr("*********************************************************");
497 tty->print_cr("** Bailout: Recompile without boxing elimination **");
498 tty->print_cr("*********************************************************");
499 }
500 if (C->directive()->BreakAtCompileOption) {
501 // Open the debugger when compiling this method.
502 tty->print("### Breaking when compiling: ");
503 method()->print_short_name();
504 tty->cr();
505 BREAKPOINT;
506 }
507
508 if( PrintOpto ) {
509 if (is_osr_compilation()) {
510 tty->print("[OSR]%3d", _compile_id);
511 } else {
512 tty->print("%3d", _compile_id);
513 }
514 }
515 #endif
516 }
517
518
519 //-----------------------init_scratch_buffer_blob------------------------------
520 // Construct a temporary BufferBlob and cache it for this compile.
521 void Compile::init_scratch_buffer_blob(int const_size) {
522 // If there is already a scratch buffer blob allocated and the
523 // constant section is big enough, use it. Otherwise free the
524 // current and allocate a new one.
525 BufferBlob* blob = scratch_buffer_blob();
526 if ((blob != NULL) && (const_size <= _scratch_const_size)) {
527 // Use the current blob.
528 } else {
529 if (blob != NULL) {
530 BufferBlob::free(blob);
531 }
532
533 ResourceMark rm;
534 _scratch_const_size = const_size;
535 int size = (MAX_inst_size + MAX_stubs_size + _scratch_const_size);
536 blob = BufferBlob::create("Compile::scratch_buffer", size);
537 // Record the buffer blob for next time.
538 set_scratch_buffer_blob(blob);
539 // Have we run out of code space?
540 if (scratch_buffer_blob() == NULL) {
541 // Let CompilerBroker disable further compilations.
542 record_failure("Not enough space for scratch buffer in CodeCache");
543 return;
544 }
545 }
546
547 // Initialize the relocation buffers
548 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
549 set_scratch_locs_memory(locs_buf);
550 }
551
552
553 //-----------------------scratch_emit_size-------------------------------------
554 // Helper function that computes size by emitting code
555 uint Compile::scratch_emit_size(const Node* n) {
556 // Start scratch_emit_size section.
557 set_in_scratch_emit_size(true);
558
559 // Emit into a trash buffer and count bytes emitted.
560 // This is a pretty expensive way to compute a size,
561 // but it works well enough if seldom used.
562 // All common fixed-size instructions are given a size
563 // method by the AD file.
564 // Note that the scratch buffer blob and locs memory are
565 // allocated at the beginning of the compile task, and
566 // may be shared by several calls to scratch_emit_size.
567 // The allocation of the scratch buffer blob is particularly
568 // expensive, since it has to grab the code cache lock.
569 BufferBlob* blob = this->scratch_buffer_blob();
570 assert(blob != NULL, "Initialize BufferBlob at start");
571 assert(blob->size() > MAX_inst_size, "sanity");
572 relocInfo* locs_buf = scratch_locs_memory();
573 address blob_begin = blob->content_begin();
574 address blob_end = (address)locs_buf;
575 assert(blob->contains(blob_end), "sanity");
576 CodeBuffer buf(blob_begin, blob_end - blob_begin);
577 buf.initialize_consts_size(_scratch_const_size);
578 buf.initialize_stubs_size(MAX_stubs_size);
579 assert(locs_buf != NULL, "sanity");
580 int lsize = MAX_locs_size / 3;
581 buf.consts()->initialize_shared_locs(&locs_buf[lsize * 0], lsize);
582 buf.insts()->initialize_shared_locs( &locs_buf[lsize * 1], lsize);
583 buf.stubs()->initialize_shared_locs( &locs_buf[lsize * 2], lsize);
584 // Mark as scratch buffer.
585 buf.consts()->set_scratch_emit();
586 buf.insts()->set_scratch_emit();
587 buf.stubs()->set_scratch_emit();
588
589 // Do the emission.
590
591 Label fakeL; // Fake label for branch instructions.
592 Label* saveL = NULL;
593 uint save_bnum = 0;
594 bool is_branch = n->is_MachBranch();
595 if (is_branch) {
596 MacroAssembler masm(&buf);
597 masm.bind(fakeL);
598 n->as_MachBranch()->save_label(&saveL, &save_bnum);
599 n->as_MachBranch()->label_set(&fakeL, 0);
600 }
601 n->emit(buf, this->regalloc());
602
603 // Emitting into the scratch buffer should not fail
604 assert (!failing(), "Must not have pending failure. Reason is: %s", failure_reason());
605
606 if (is_branch) // Restore label.
607 n->as_MachBranch()->label_set(saveL, save_bnum);
608
609 // End scratch_emit_size section.
610 set_in_scratch_emit_size(false);
611
612 return buf.insts_size();
613 }
614
615
616 // ============================================================================
617 //------------------------------Compile standard-------------------------------
618 debug_only( int Compile::_debug_idx = 100000; )
619
620 // Compile a method. entry_bci is -1 for normal compilations and indicates
621 // the continuation bci for on stack replacement.
622
623
624 Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr_bci,
625 bool subsume_loads, bool do_escape_analysis, bool eliminate_boxing, DirectiveSet* directive)
626 : Phase(Compiler),
627 _env(ci_env),
628 _directive(directive),
629 _log(ci_env->log()),
630 _compile_id(ci_env->compile_id()),
631 _save_argument_registers(false),
632 _stub_name(NULL),
633 _stub_function(NULL),
634 _stub_entry_point(NULL),
635 _method(target),
636 _entry_bci(osr_bci),
637 _initial_gvn(NULL),
638 _for_igvn(NULL),
639 _warm_calls(NULL),
640 _subsume_loads(subsume_loads),
641 _do_escape_analysis(do_escape_analysis),
642 _eliminate_boxing(eliminate_boxing),
643 _failure_reason(NULL),
644 _code_buffer("Compile::Fill_buffer"),
645 _orig_pc_slot(0),
646 _orig_pc_slot_offset_in_bytes(0),
647 _has_method_handle_invokes(false),
648 _mach_constant_base_node(NULL),
649 _node_bundling_limit(0),
650 _node_bundling_base(NULL),
651 _java_calls(0),
652 _inner_loops(0),
653 _scratch_const_size(-1),
654 _in_scratch_emit_size(false),
655 _dead_node_list(comp_arena()),
656 _dead_node_count(0),
657 #ifndef PRODUCT
658 _trace_opto_output(directive->TraceOptoOutputOption),
659 _in_dump_cnt(0),
660 _printer(IdealGraphPrinter::printer()),
661 #endif
662 _congraph(NULL),
663 _comp_arena(mtCompiler),
664 _node_arena(mtCompiler),
665 _old_arena(mtCompiler),
666 _Compile_types(mtCompiler),
667 _replay_inline_data(NULL),
668 _late_inlines(comp_arena(), 2, 0, NULL),
669 _string_late_inlines(comp_arena(), 2, 0, NULL),
670 _boxing_late_inlines(comp_arena(), 2, 0, NULL),
671 _late_inlines_pos(0),
672 _number_of_mh_late_inlines(0),
673 _inlining_progress(false),
674 _inlining_incrementally(false),
675 _print_inlining_list(NULL),
676 _print_inlining_stream(NULL),
677 _print_inlining_idx(0),
678 _print_inlining_output(NULL),
679 _interpreter_frame_size(0),
680 _max_node_limit(MaxNodeLimit),
681 _has_reserved_stack_access(target->has_reserved_stack_access()) {
682 C = this;
683 #ifndef PRODUCT
684 if (_printer != NULL) {
685 _printer->set_compile(this);
686 }
687 #endif
688 CompileWrapper cw(this);
689
690 if (CITimeVerbose) {
691 tty->print(" ");
692 target->holder()->name()->print();
693 tty->print(".");
694 target->print_short_name();
695 tty->print(" ");
696 }
697 TraceTime t1("Total compilation time", &_t_totalCompilation, CITime, CITimeVerbose);
698 TraceTime t2(NULL, &_t_methodCompilation, CITime, false);
699
700 #ifndef PRODUCT
701 bool print_opto_assembly = directive->PrintOptoAssemblyOption;
702 if (!print_opto_assembly) {
703 bool print_assembly = directive->PrintAssemblyOption;
704 if (print_assembly && !Disassembler::can_decode()) {
705 tty->print_cr("PrintAssembly request changed to PrintOptoAssembly");
706 print_opto_assembly = true;
707 }
708 }
709 set_print_assembly(print_opto_assembly);
710 set_parsed_irreducible_loop(false);
711
712 if (directive->ReplayInlineOption) {
713 _replay_inline_data = ciReplay::load_inline_data(method(), entry_bci(), ci_env->comp_level());
714 }
715 #endif
716 set_print_inlining(directive->PrintInliningOption || PrintOptoInlining);
717 set_print_intrinsics(directive->PrintIntrinsicsOption);
718 set_has_irreducible_loop(true); // conservative until build_loop_tree() reset it
719
720 if (ProfileTraps RTM_OPT_ONLY( || UseRTMLocking )) {
721 // Make sure the method being compiled gets its own MDO,
722 // so we can at least track the decompile_count().
723 // Need MDO to record RTM code generation state.
724 method()->ensure_method_data();
725 }
726
727 Init(::AliasLevel);
728
729
730 print_compile_messages();
731
732 _ilt = InlineTree::build_inline_tree_root();
733
734 // Even if NO memory addresses are used, MergeMem nodes must have at least 1 slice
735 assert(num_alias_types() >= AliasIdxRaw, "");
736
737 #define MINIMUM_NODE_HASH 1023
738 // Node list that Iterative GVN will start with
739 Unique_Node_List for_igvn(comp_arena());
740 set_for_igvn(&for_igvn);
741
742 // GVN that will be run immediately on new nodes
743 uint estimated_size = method()->code_size()*4+64;
744 estimated_size = (estimated_size < MINIMUM_NODE_HASH ? MINIMUM_NODE_HASH : estimated_size);
745 PhaseGVN gvn(node_arena(), estimated_size);
746 set_initial_gvn(&gvn);
747
748 print_inlining_init();
749 { // Scope for timing the parser
750 TracePhase tp("parse", &timers[_t_parser]);
751
752 // Put top into the hash table ASAP.
753 initial_gvn()->transform_no_reclaim(top());
754
755 // Set up tf(), start(), and find a CallGenerator.
756 CallGenerator* cg = NULL;
757 if (is_osr_compilation()) {
758 const TypeTuple *domain = StartOSRNode::osr_domain();
759 const TypeTuple *range = TypeTuple::make_range(method()->signature());
760 init_tf(TypeFunc::make(domain, range));
761 StartNode* s = new StartOSRNode(root(), domain);
762 initial_gvn()->set_type_bottom(s);
763 init_start(s);
764 cg = CallGenerator::for_osr(method(), entry_bci());
765 } else {
766 // Normal case.
767 init_tf(TypeFunc::make(method()));
768 StartNode* s = new StartNode(root(), tf()->domain_cc());
769 initial_gvn()->set_type_bottom(s);
770 init_start(s);
771 if (method()->intrinsic_id() == vmIntrinsics::_Reference_get && UseG1GC) {
772 // With java.lang.ref.reference.get() we must go through the
773 // intrinsic when G1 is enabled - even when get() is the root
774 // method of the compile - so that, if necessary, the value in
775 // the referent field of the reference object gets recorded by
776 // the pre-barrier code.
777 // Specifically, if G1 is enabled, the value in the referent
778 // field is recorded by the G1 SATB pre barrier. This will
779 // result in the referent being marked live and the reference
780 // object removed from the list of discovered references during
781 // reference processing.
782 cg = find_intrinsic(method(), false);
783 }
784 if (cg == NULL) {
785 float past_uses = method()->interpreter_invocation_count();
786 float expected_uses = past_uses;
787 cg = CallGenerator::for_inline(method(), expected_uses);
788 }
789 }
790 if (failing()) return;
791 if (cg == NULL) {
792 record_method_not_compilable("cannot parse method");
793 return;
794 }
795 JVMState* jvms = build_start_state(start(), tf());
796 if ((jvms = cg->generate(jvms)) == NULL) {
797 if (!failure_reason_is(C2Compiler::retry_class_loading_during_parsing())) {
798 record_method_not_compilable("method parse failed");
799 }
800 return;
801 }
802 GraphKit kit(jvms);
803
804 if (!kit.stopped()) {
805 // Accept return values, and transfer control we know not where.
806 // This is done by a special, unique ReturnNode bound to root.
807 return_values(kit.jvms());
808 }
809
810 if (kit.has_exceptions()) {
811 // Any exceptions that escape from this call must be rethrown
812 // to whatever caller is dynamically above us on the stack.
813 // This is done by a special, unique RethrowNode bound to root.
814 rethrow_exceptions(kit.transfer_exceptions_into_jvms());
815 }
816
817 assert(IncrementalInline || (_late_inlines.length() == 0 && !has_mh_late_inlines()), "incremental inlining is off");
818
819 if (_late_inlines.length() == 0 && !has_mh_late_inlines() && !failing() && has_stringbuilder()) {
820 inline_string_calls(true);
821 }
822
823 if (failing()) return;
824
825 print_method(PHASE_BEFORE_REMOVEUSELESS, 3);
826
827 // Remove clutter produced by parsing.
828 if (!failing()) {
829 ResourceMark rm;
830 PhaseRemoveUseless pru(initial_gvn(), &for_igvn);
831 }
832 }
833
834 // Note: Large methods are capped off in do_one_bytecode().
835 if (failing()) return;
836
837 // After parsing, node notes are no longer automagic.
838 // They must be propagated by register_new_node_with_optimizer(),
839 // clone(), or the like.
840 set_default_node_notes(NULL);
841
842 for (;;) {
843 int successes = Inline_Warm();
844 if (failing()) return;
845 if (successes == 0) break;
846 }
847
848 // Drain the list.
849 Finish_Warm();
850 #ifndef PRODUCT
851 if (_printer && _printer->should_print(1)) {
852 _printer->print_inlining();
853 }
854 #endif
855
856 if (failing()) return;
857 NOT_PRODUCT( verify_graph_edges(); )
858
859 // Now optimize
860 Optimize();
861 if (failing()) return;
862 NOT_PRODUCT( verify_graph_edges(); )
863
864 #ifndef PRODUCT
865 if (PrintIdeal) {
866 ttyLocker ttyl; // keep the following output all in one block
867 // This output goes directly to the tty, not the compiler log.
868 // To enable tools to match it up with the compilation activity,
869 // be sure to tag this tty output with the compile ID.
870 if (xtty != NULL) {
871 xtty->head("ideal compile_id='%d'%s", compile_id(),
872 is_osr_compilation() ? " compile_kind='osr'" :
873 "");
874 }
875 root()->dump(9999);
876 if (xtty != NULL) {
877 xtty->tail("ideal");
878 }
879 }
880 #endif
881
882 NOT_PRODUCT( verify_barriers(); )
883
884 // Dump compilation data to replay it.
885 if (directive->DumpReplayOption) {
886 env()->dump_replay_data(_compile_id);
887 }
888 if (directive->DumpInlineOption && (ilt() != NULL)) {
889 env()->dump_inline_data(_compile_id);
890 }
891
892 // Now that we know the size of all the monitors we can add a fixed slot
893 // for the original deopt pc.
894
895 _orig_pc_slot = fixed_slots();
896 int next_slot = _orig_pc_slot + (sizeof(address) / VMRegImpl::stack_slot_size);
897 set_fixed_slots(next_slot);
898
899 // Compute when to use implicit null checks. Used by matching trap based
900 // nodes and NullCheck optimization.
901 set_allowed_deopt_reasons();
902
903 // Now generate code
904 Code_Gen();
905 if (failing()) return;
906
907 // Check if we want to skip execution of all compiled code.
908 {
909 #ifndef PRODUCT
910 if (OptoNoExecute) {
911 record_method_not_compilable("+OptoNoExecute"); // Flag as failed
912 return;
913 }
914 #endif
915 TracePhase tp("install_code", &timers[_t_registerMethod]);
916
917 if (is_osr_compilation()) {
918 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
919 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
920 } else {
921 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
922 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
923 }
924
925 env()->register_method(_method, _entry_bci,
926 &_code_offsets,
927 _orig_pc_slot_offset_in_bytes,
928 code_buffer(),
929 frame_size_in_words(), _oop_map_set,
930 &_handler_table, &_inc_table,
931 compiler,
932 has_unsafe_access(),
933 SharedRuntime::is_wide_vector(max_vector_size()),
934 rtm_state()
935 );
936
937 if (log() != NULL) // Print code cache state into compiler log
938 log()->code_cache_state();
939 }
940 }
941
942 //------------------------------Compile----------------------------------------
943 // Compile a runtime stub
944 Compile::Compile( ciEnv* ci_env,
945 TypeFunc_generator generator,
946 address stub_function,
947 const char *stub_name,
948 int is_fancy_jump,
949 bool pass_tls,
950 bool save_arg_registers,
951 bool return_pc,
952 DirectiveSet* directive)
953 : Phase(Compiler),
954 _env(ci_env),
955 _directive(directive),
956 _log(ci_env->log()),
957 _compile_id(0),
958 _save_argument_registers(save_arg_registers),
959 _method(NULL),
960 _stub_name(stub_name),
961 _stub_function(stub_function),
962 _stub_entry_point(NULL),
963 _entry_bci(InvocationEntryBci),
964 _initial_gvn(NULL),
965 _for_igvn(NULL),
966 _warm_calls(NULL),
967 _orig_pc_slot(0),
968 _orig_pc_slot_offset_in_bytes(0),
969 _subsume_loads(true),
970 _do_escape_analysis(false),
971 _eliminate_boxing(false),
972 _failure_reason(NULL),
973 _code_buffer("Compile::Fill_buffer"),
974 _has_method_handle_invokes(false),
975 _mach_constant_base_node(NULL),
976 _node_bundling_limit(0),
977 _node_bundling_base(NULL),
978 _java_calls(0),
979 _inner_loops(0),
980 #ifndef PRODUCT
981 _trace_opto_output(directive->TraceOptoOutputOption),
982 _in_dump_cnt(0),
983 _printer(NULL),
984 #endif
985 _comp_arena(mtCompiler),
986 _node_arena(mtCompiler),
987 _old_arena(mtCompiler),
988 _Compile_types(mtCompiler),
989 _dead_node_list(comp_arena()),
990 _dead_node_count(0),
991 _congraph(NULL),
992 _replay_inline_data(NULL),
993 _number_of_mh_late_inlines(0),
994 _inlining_progress(false),
995 _inlining_incrementally(false),
996 _print_inlining_list(NULL),
997 _print_inlining_stream(NULL),
998 _print_inlining_idx(0),
999 _print_inlining_output(NULL),
1000 _allowed_reasons(0),
1001 _interpreter_frame_size(0),
1002 _max_node_limit(MaxNodeLimit) {
1003 C = this;
1004
1005 TraceTime t1(NULL, &_t_totalCompilation, CITime, false);
1006 TraceTime t2(NULL, &_t_stubCompilation, CITime, false);
1007
1008 #ifndef PRODUCT
1009 set_print_assembly(PrintFrameConverterAssembly);
1010 set_parsed_irreducible_loop(false);
1011 #endif
1012 set_has_irreducible_loop(false); // no loops
1013
1014 CompileWrapper cw(this);
1015 Init(/*AliasLevel=*/ 0);
1016 init_tf((*generator)());
1017
1018 {
1019 // The following is a dummy for the sake of GraphKit::gen_stub
1020 Unique_Node_List for_igvn(comp_arena());
1021 set_for_igvn(&for_igvn); // not used, but some GraphKit guys push on this
1022 PhaseGVN gvn(Thread::current()->resource_area(),255);
1023 set_initial_gvn(&gvn); // not significant, but GraphKit guys use it pervasively
1024 gvn.transform_no_reclaim(top());
1025
1026 GraphKit kit;
1027 kit.gen_stub(stub_function, stub_name, is_fancy_jump, pass_tls, return_pc);
1028 }
1029
1030 NOT_PRODUCT( verify_graph_edges(); )
1031 Code_Gen();
1032 if (failing()) return;
1033
1034
1035 // Entry point will be accessed using compile->stub_entry_point();
1036 if (code_buffer() == NULL) {
1037 Matcher::soft_match_failure();
1038 } else {
1039 if (PrintAssembly && (WizardMode || Verbose))
1040 tty->print_cr("### Stub::%s", stub_name);
1041
1042 if (!failing()) {
1043 assert(_fixed_slots == 0, "no fixed slots used for runtime stubs");
1044
1045 // Make the NMethod
1046 // For now we mark the frame as never safe for profile stackwalking
1047 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
1048 code_buffer(),
1049 CodeOffsets::frame_never_safe,
1050 // _code_offsets.value(CodeOffsets::Frame_Complete),
1051 frame_size_in_words(),
1052 _oop_map_set,
1053 save_arg_registers);
1054 assert(rs != NULL && rs->is_runtime_stub(), "sanity check");
1055
1056 _stub_entry_point = rs->entry_point();
1057 }
1058 }
1059 }
1060
1061 //------------------------------Init-------------------------------------------
1062 // Prepare for a single compilation
1063 void Compile::Init(int aliaslevel) {
1064 _unique = 0;
1065 _regalloc = NULL;
1066
1067 _tf = NULL; // filled in later
1068 _top = NULL; // cached later
1069 _matcher = NULL; // filled in later
1070 _cfg = NULL; // filled in later
1071
1072 set_24_bit_selection_and_mode(Use24BitFP, false);
1073
1074 _node_note_array = NULL;
1075 _default_node_notes = NULL;
1076 DEBUG_ONLY( _modified_nodes = NULL; ) // Used in Optimize()
1077
1078 _immutable_memory = NULL; // filled in at first inquiry
1079
1080 // Globally visible Nodes
1081 // First set TOP to NULL to give safe behavior during creation of RootNode
1082 set_cached_top_node(NULL);
1083 set_root(new RootNode());
1084 // Now that you have a Root to point to, create the real TOP
1085 set_cached_top_node( new ConNode(Type::TOP) );
1086 set_recent_alloc(NULL, NULL);
1087
1088 // Create Debug Information Recorder to record scopes, oopmaps, etc.
1089 env()->set_oop_recorder(new OopRecorder(env()->arena()));
1090 env()->set_debug_info(new DebugInformationRecorder(env()->oop_recorder()));
1091 env()->set_dependencies(new Dependencies(env()));
1092
1093 _fixed_slots = 0;
1094 set_has_split_ifs(false);
1095 set_has_loops(has_method() && method()->has_loops()); // first approximation
1096 set_has_stringbuilder(false);
1097 set_has_boxed_value(false);
1098 _trap_can_recompile = false; // no traps emitted yet
1099 _major_progress = true; // start out assuming good things will happen
1100 set_has_unsafe_access(false);
1101 set_max_vector_size(0);
1102 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist));
1103 set_decompile_count(0);
1104
1105 set_do_freq_based_layout(_directive->BlockLayoutByFrequencyOption);
1106 set_num_loop_opts(LoopOptsCount);
1107 set_do_inlining(Inline);
1108 set_max_inline_size(MaxInlineSize);
1109 set_freq_inline_size(FreqInlineSize);
1110 set_do_scheduling(OptoScheduling);
1111 set_do_count_invocations(false);
1112 set_do_method_data_update(false);
1113
1114 set_do_vector_loop(false);
1115
1116 if (AllowVectorizeOnDemand) {
1117 if (has_method() && (_directive->VectorizeOption || _directive->VectorizeDebugOption)) {
1118 set_do_vector_loop(true);
1119 NOT_PRODUCT(if (do_vector_loop() && Verbose) {tty->print("Compile::Init: do vectorized loops (SIMD like) for method %s\n", method()->name()->as_quoted_ascii());})
1120 } else if (has_method() && method()->name() != 0 &&
1121 method()->intrinsic_id() == vmIntrinsics::_forEachRemaining) {
1122 set_do_vector_loop(true);
1123 }
1124 }
1125 set_use_cmove(UseCMoveUnconditionally /* || do_vector_loop()*/); //TODO: consider do_vector_loop() mandate use_cmove unconditionally
1126 NOT_PRODUCT(if (use_cmove() && Verbose && has_method()) {tty->print("Compile::Init: use CMove without profitability tests for method %s\n", method()->name()->as_quoted_ascii());})
1127
1128 set_age_code(has_method() && method()->profile_aging());
1129 set_rtm_state(NoRTM); // No RTM lock eliding by default
1130 _max_node_limit = _directive->MaxNodeLimitOption;
1131
1132 #if INCLUDE_RTM_OPT
1133 if (UseRTMLocking && has_method() && (method()->method_data_or_null() != NULL)) {
1134 int rtm_state = method()->method_data()->rtm_state();
1135 if (method_has_option("NoRTMLockEliding") || ((rtm_state & NoRTM) != 0)) {
1136 // Don't generate RTM lock eliding code.
1137 set_rtm_state(NoRTM);
1138 } else if (method_has_option("UseRTMLockEliding") || ((rtm_state & UseRTM) != 0) || !UseRTMDeopt) {
1139 // Generate RTM lock eliding code without abort ratio calculation code.
1140 set_rtm_state(UseRTM);
1141 } else if (UseRTMDeopt) {
1142 // Generate RTM lock eliding code and include abort ratio calculation
1143 // code if UseRTMDeopt is on.
1144 set_rtm_state(ProfileRTM);
1145 }
1146 }
1147 #endif
1148 if (debug_info()->recording_non_safepoints()) {
1149 set_node_note_array(new(comp_arena()) GrowableArray<Node_Notes*>
1150 (comp_arena(), 8, 0, NULL));
1151 set_default_node_notes(Node_Notes::make(this));
1152 }
1153
1154 // // -- Initialize types before each compile --
1155 // // Update cached type information
1156 // if( _method && _method->constants() )
1157 // Type::update_loaded_types(_method, _method->constants());
1158
1159 // Init alias_type map.
1160 if (!_do_escape_analysis && aliaslevel == 3)
1161 aliaslevel = 2; // No unique types without escape analysis
1162 _AliasLevel = aliaslevel;
1163 const int grow_ats = 16;
1164 _max_alias_types = grow_ats;
1165 _alias_types = NEW_ARENA_ARRAY(comp_arena(), AliasType*, grow_ats);
1166 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, grow_ats);
1167 Copy::zero_to_bytes(ats, sizeof(AliasType)*grow_ats);
1168 {
1169 for (int i = 0; i < grow_ats; i++) _alias_types[i] = &ats[i];
1170 }
1171 // Initialize the first few types.
1172 _alias_types[AliasIdxTop]->Init(AliasIdxTop, NULL);
1173 _alias_types[AliasIdxBot]->Init(AliasIdxBot, TypePtr::BOTTOM);
1174 _alias_types[AliasIdxRaw]->Init(AliasIdxRaw, TypeRawPtr::BOTTOM);
1175 _num_alias_types = AliasIdxRaw+1;
1176 // Zero out the alias type cache.
1177 Copy::zero_to_bytes(_alias_cache, sizeof(_alias_cache));
1178 // A NULL adr_type hits in the cache right away. Preload the right answer.
1179 probe_alias_cache(NULL)->_index = AliasIdxTop;
1180
1181 _intrinsics = NULL;
1182 _macro_nodes = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1183 _predicate_opaqs = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1184 _expensive_nodes = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1185 _range_check_casts = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1186 _value_type_ptr_nodes = new(comp_arena()) GrowableArray<ValueTypePtrNode*>(comp_arena(), 8, 0, NULL);
1187 register_library_intrinsics();
1188 }
1189
1190 //---------------------------init_start----------------------------------------
1191 // Install the StartNode on this compile object.
1192 void Compile::init_start(StartNode* s) {
1193 if (failing())
1194 return; // already failing
1195 assert(s == start(), "");
1196 }
1197
1198 /**
1199 * Return the 'StartNode'. We must not have a pending failure, since the ideal graph
1200 * can be in an inconsistent state, i.e., we can get segmentation faults when traversing
1201 * the ideal graph.
1202 */
1203 StartNode* Compile::start() const {
1204 assert (!failing(), "Must not have pending failure. Reason is: %s", failure_reason());
1205 for (DUIterator_Fast imax, i = root()->fast_outs(imax); i < imax; i++) {
1206 Node* start = root()->fast_out(i);
1207 if (start->is_Start()) {
1208 return start->as_Start();
1209 }
1210 }
1211 fatal("Did not find Start node!");
1212 return NULL;
1213 }
1214
1215 //-------------------------------immutable_memory-------------------------------------
1216 // Access immutable memory
1217 Node* Compile::immutable_memory() {
1218 if (_immutable_memory != NULL) {
1219 return _immutable_memory;
1220 }
1221 StartNode* s = start();
1222 for (DUIterator_Fast imax, i = s->fast_outs(imax); true; i++) {
1223 Node *p = s->fast_out(i);
1224 if (p != s && p->as_Proj()->_con == TypeFunc::Memory) {
1225 _immutable_memory = p;
1226 return _immutable_memory;
1227 }
1228 }
1229 ShouldNotReachHere();
1230 return NULL;
1231 }
1232
1233 //----------------------set_cached_top_node------------------------------------
1234 // Install the cached top node, and make sure Node::is_top works correctly.
1235 void Compile::set_cached_top_node(Node* tn) {
1236 if (tn != NULL) verify_top(tn);
1237 Node* old_top = _top;
1238 _top = tn;
1239 // Calling Node::setup_is_top allows the nodes the chance to adjust
1240 // their _out arrays.
1241 if (_top != NULL) _top->setup_is_top();
1242 if (old_top != NULL) old_top->setup_is_top();
1243 assert(_top == NULL || top()->is_top(), "");
1244 }
1245
1246 #ifdef ASSERT
1247 uint Compile::count_live_nodes_by_graph_walk() {
1248 Unique_Node_List useful(comp_arena());
1249 // Get useful node list by walking the graph.
1250 identify_useful_nodes(useful);
1251 return useful.size();
1252 }
1253
1254 void Compile::print_missing_nodes() {
1255
1256 // Return if CompileLog is NULL and PrintIdealNodeCount is false.
1257 if ((_log == NULL) && (! PrintIdealNodeCount)) {
1258 return;
1259 }
1260
1261 // This is an expensive function. It is executed only when the user
1262 // specifies VerifyIdealNodeCount option or otherwise knows the
1263 // additional work that needs to be done to identify reachable nodes
1264 // by walking the flow graph and find the missing ones using
1265 // _dead_node_list.
1266
1267 Unique_Node_List useful(comp_arena());
1268 // Get useful node list by walking the graph.
1269 identify_useful_nodes(useful);
1270
1271 uint l_nodes = C->live_nodes();
1272 uint l_nodes_by_walk = useful.size();
1273
1274 if (l_nodes != l_nodes_by_walk) {
1275 if (_log != NULL) {
1276 _log->begin_head("mismatched_nodes count='%d'", abs((int) (l_nodes - l_nodes_by_walk)));
1277 _log->stamp();
1278 _log->end_head();
1279 }
1280 VectorSet& useful_member_set = useful.member_set();
1281 int last_idx = l_nodes_by_walk;
1282 for (int i = 0; i < last_idx; i++) {
1283 if (useful_member_set.test(i)) {
1284 if (_dead_node_list.test(i)) {
1285 if (_log != NULL) {
1286 _log->elem("mismatched_node_info node_idx='%d' type='both live and dead'", i);
1287 }
1288 if (PrintIdealNodeCount) {
1289 // Print the log message to tty
1290 tty->print_cr("mismatched_node idx='%d' both live and dead'", i);
1291 useful.at(i)->dump();
1292 }
1293 }
1294 }
1295 else if (! _dead_node_list.test(i)) {
1296 if (_log != NULL) {
1297 _log->elem("mismatched_node_info node_idx='%d' type='neither live nor dead'", i);
1298 }
1299 if (PrintIdealNodeCount) {
1300 // Print the log message to tty
1301 tty->print_cr("mismatched_node idx='%d' type='neither live nor dead'", i);
1302 }
1303 }
1304 }
1305 if (_log != NULL) {
1306 _log->tail("mismatched_nodes");
1307 }
1308 }
1309 }
1310 void Compile::record_modified_node(Node* n) {
1311 if (_modified_nodes != NULL && !_inlining_incrementally &&
1312 n->outcnt() != 0 && !n->is_Con()) {
1313 _modified_nodes->push(n);
1314 }
1315 }
1316
1317 void Compile::remove_modified_node(Node* n) {
1318 if (_modified_nodes != NULL) {
1319 _modified_nodes->remove(n);
1320 }
1321 }
1322 #endif
1323
1324 #ifndef PRODUCT
1325 void Compile::verify_top(Node* tn) const {
1326 if (tn != NULL) {
1327 assert(tn->is_Con(), "top node must be a constant");
1328 assert(((ConNode*)tn)->type() == Type::TOP, "top node must have correct type");
1329 assert(tn->in(0) != NULL, "must have live top node");
1330 }
1331 }
1332 #endif
1333
1334
1335 ///-------------------Managing Per-Node Debug & Profile Info-------------------
1336
1337 void Compile::grow_node_notes(GrowableArray<Node_Notes*>* arr, int grow_by) {
1338 guarantee(arr != NULL, "");
1339 int num_blocks = arr->length();
1340 if (grow_by < num_blocks) grow_by = num_blocks;
1341 int num_notes = grow_by * _node_notes_block_size;
1342 Node_Notes* notes = NEW_ARENA_ARRAY(node_arena(), Node_Notes, num_notes);
1343 Copy::zero_to_bytes(notes, num_notes * sizeof(Node_Notes));
1344 while (num_notes > 0) {
1345 arr->append(notes);
1346 notes += _node_notes_block_size;
1347 num_notes -= _node_notes_block_size;
1348 }
1349 assert(num_notes == 0, "exact multiple, please");
1350 }
1351
1352 bool Compile::copy_node_notes_to(Node* dest, Node* source) {
1353 if (source == NULL || dest == NULL) return false;
1354
1355 if (dest->is_Con())
1356 return false; // Do not push debug info onto constants.
1357
1358 #ifdef ASSERT
1359 // Leave a bread crumb trail pointing to the original node:
1360 if (dest != NULL && dest != source && dest->debug_orig() == NULL) {
1361 dest->set_debug_orig(source);
1362 }
1363 #endif
1364
1365 if (node_note_array() == NULL)
1366 return false; // Not collecting any notes now.
1367
1368 // This is a copy onto a pre-existing node, which may already have notes.
1369 // If both nodes have notes, do not overwrite any pre-existing notes.
1370 Node_Notes* source_notes = node_notes_at(source->_idx);
1371 if (source_notes == NULL || source_notes->is_clear()) return false;
1372 Node_Notes* dest_notes = node_notes_at(dest->_idx);
1373 if (dest_notes == NULL || dest_notes->is_clear()) {
1374 return set_node_notes_at(dest->_idx, source_notes);
1375 }
1376
1377 Node_Notes merged_notes = (*source_notes);
1378 // The order of operations here ensures that dest notes will win...
1379 merged_notes.update_from(dest_notes);
1380 return set_node_notes_at(dest->_idx, &merged_notes);
1381 }
1382
1383
1384 //--------------------------allow_range_check_smearing-------------------------
1385 // Gating condition for coalescing similar range checks.
1386 // Sometimes we try 'speculatively' replacing a series of a range checks by a
1387 // single covering check that is at least as strong as any of them.
1388 // If the optimization succeeds, the simplified (strengthened) range check
1389 // will always succeed. If it fails, we will deopt, and then give up
1390 // on the optimization.
1391 bool Compile::allow_range_check_smearing() const {
1392 // If this method has already thrown a range-check,
1393 // assume it was because we already tried range smearing
1394 // and it failed.
1395 uint already_trapped = trap_count(Deoptimization::Reason_range_check);
1396 return !already_trapped;
1397 }
1398
1399
1400 //------------------------------flatten_alias_type-----------------------------
1401 const TypePtr *Compile::flatten_alias_type( const TypePtr *tj ) const {
1402 int offset = tj->offset();
1403 TypePtr::PTR ptr = tj->ptr();
1404
1405 // Known instance (scalarizable allocation) alias only with itself.
1406 bool is_known_inst = tj->isa_oopptr() != NULL &&
1407 tj->is_oopptr()->is_known_instance();
1408
1409 // Process weird unsafe references.
1410 if (offset == Type::OffsetBot && (tj->isa_instptr() /*|| tj->isa_klassptr()*/)) {
1411 assert(InlineUnsafeOps, "indeterminate pointers come only from unsafe ops");
1412 assert(!is_known_inst, "scalarizable allocation should not have unsafe references");
1413 tj = TypeOopPtr::BOTTOM;
1414 ptr = tj->ptr();
1415 offset = tj->offset();
1416 }
1417
1418 // Array pointers need some flattening
1419 const TypeAryPtr *ta = tj->isa_aryptr();
1420 if (ta && ta->is_stable()) {
1421 // Erase stability property for alias analysis.
1422 tj = ta = ta->cast_to_stable(false);
1423 }
1424 if( ta && is_known_inst ) {
1425 if ( offset != Type::OffsetBot &&
1426 offset > arrayOopDesc::length_offset_in_bytes() ) {
1427 offset = Type::OffsetBot; // Flatten constant access into array body only
1428 tj = ta = TypeAryPtr::make(ptr, ta->ary(), ta->klass(), true, Type::Offset(offset), ta->field_offset(), ta->instance_id());
1429 }
1430 } else if( ta && _AliasLevel >= 2 ) {
1431 // For arrays indexed by constant indices, we flatten the alias
1432 // space to include all of the array body. Only the header, klass
1433 // and array length can be accessed un-aliased.
1434 // For flattened value type array, each field has its own slice so
1435 // we must include the field offset.
1436 if( offset != Type::OffsetBot ) {
1437 if( ta->const_oop() ) { // MethodData* or Method*
1438 offset = Type::OffsetBot; // Flatten constant access into array body
1439 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),ta->ary(),ta->klass(),false,Type::Offset(offset), ta->field_offset());
1440 } else if( offset == arrayOopDesc::length_offset_in_bytes() ) {
1441 // range is OK as-is.
1442 tj = ta = TypeAryPtr::RANGE;
1443 } else if( offset == oopDesc::klass_offset_in_bytes() ) {
1444 tj = TypeInstPtr::KLASS; // all klass loads look alike
1445 ta = TypeAryPtr::RANGE; // generic ignored junk
1446 ptr = TypePtr::BotPTR;
1447 } else if( offset == oopDesc::mark_offset_in_bytes() ) {
1448 tj = TypeInstPtr::MARK;
1449 ta = TypeAryPtr::RANGE; // generic ignored junk
1450 ptr = TypePtr::BotPTR;
1451 } else { // Random constant offset into array body
1452 offset = Type::OffsetBot; // Flatten constant access into array body
1453 tj = ta = TypeAryPtr::make(ptr,ta->ary(),ta->klass(),false,Type::Offset(offset), ta->field_offset());
1454 }
1455 }
1456 // Arrays of fixed size alias with arrays of unknown size.
1457 if (ta->size() != TypeInt::POS) {
1458 const TypeAry *tary = TypeAry::make(ta->elem(), TypeInt::POS);
1459 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,ta->klass(),false,Type::Offset(offset), ta->field_offset());
1460 }
1461 // Arrays of known objects become arrays of unknown objects.
1462 if (ta->elem()->isa_narrowoop() && ta->elem() != TypeNarrowOop::BOTTOM) {
1463 const TypeAry *tary = TypeAry::make(TypeNarrowOop::BOTTOM, ta->size());
1464 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,Type::Offset(offset), ta->field_offset());
1465 }
1466 if (ta->elem()->isa_oopptr() && ta->elem() != TypeInstPtr::BOTTOM) {
1467 const TypeAry *tary = TypeAry::make(TypeInstPtr::BOTTOM, ta->size());
1468 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,Type::Offset(offset), ta->field_offset());
1469 }
1470 // Arrays of bytes and of booleans both use 'bastore' and 'baload' so
1471 // cannot be distinguished by bytecode alone.
1472 if (ta->elem() == TypeInt::BOOL) {
1473 const TypeAry *tary = TypeAry::make(TypeInt::BYTE, ta->size());
1474 ciKlass* aklass = ciTypeArrayKlass::make(T_BYTE);
1475 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,aklass,false,Type::Offset(offset), ta->field_offset());
1476 }
1477 // During the 2nd round of IterGVN, NotNull castings are removed.
1478 // Make sure the Bottom and NotNull variants alias the same.
1479 // Also, make sure exact and non-exact variants alias the same.
1480 if (ptr == TypePtr::NotNull || ta->klass_is_exact() || ta->speculative() != NULL) {
1481 tj = ta = TypeAryPtr::make(TypePtr::BotPTR,ta->ary(),ta->klass(),false,Type::Offset(offset), ta->field_offset());
1482 }
1483 }
1484
1485 // Oop pointers need some flattening
1486 const TypeInstPtr *to = tj->isa_instptr();
1487 if( to && _AliasLevel >= 2 && to != TypeOopPtr::BOTTOM ) {
1488 ciInstanceKlass *k = to->klass()->as_instance_klass();
1489 if( ptr == TypePtr::Constant ) {
1490 if (to->klass() != ciEnv::current()->Class_klass() ||
1491 offset < k->size_helper() * wordSize) {
1492 // No constant oop pointers (such as Strings); they alias with
1493 // unknown strings.
1494 assert(!is_known_inst, "not scalarizable allocation");
1495 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,Type::Offset(offset));
1496 }
1497 } else if( is_known_inst ) {
1498 tj = to; // Keep NotNull and klass_is_exact for instance type
1499 } else if( ptr == TypePtr::NotNull || to->klass_is_exact() ) {
1500 // During the 2nd round of IterGVN, NotNull castings are removed.
1501 // Make sure the Bottom and NotNull variants alias the same.
1502 // Also, make sure exact and non-exact variants alias the same.
1503 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,Type::Offset(offset));
1504 }
1505 if (to->speculative() != NULL) {
1506 tj = to = TypeInstPtr::make(to->ptr(),to->klass(),to->klass_is_exact(),to->const_oop(),Type::Offset(to->offset()), to->instance_id());
1507 }
1508 // Canonicalize the holder of this field
1509 if (offset >= 0 && offset < instanceOopDesc::base_offset_in_bytes()) {
1510 // First handle header references such as a LoadKlassNode, even if the
1511 // object's klass is unloaded at compile time (4965979).
1512 if (!is_known_inst) { // Do it only for non-instance types
1513 tj = to = TypeInstPtr::make(TypePtr::BotPTR, env()->Object_klass(), false, NULL, Type::Offset(offset));
1514 }
1515 } else if (offset < 0 || offset >= k->size_helper() * wordSize) {
1516 // Static fields are in the space above the normal instance
1517 // fields in the java.lang.Class instance.
1518 if (to->klass() != ciEnv::current()->Class_klass()) {
1519 to = NULL;
1520 tj = TypeOopPtr::BOTTOM;
1521 offset = tj->offset();
1522 }
1523 } else {
1524 ciInstanceKlass *canonical_holder = k->get_canonical_holder(offset);
1525 if (!k->equals(canonical_holder) || tj->offset() != offset) {
1526 if( is_known_inst ) {
1527 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, true, NULL, Type::Offset(offset), to->instance_id());
1528 } else {
1529 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, false, NULL, Type::Offset(offset));
1530 }
1531 }
1532 }
1533 }
1534
1535 // Klass pointers to object array klasses need some flattening
1536 const TypeKlassPtr *tk = tj->isa_klassptr();
1537 if( tk ) {
1538 // If we are referencing a field within a Klass, we need
1539 // to assume the worst case of an Object. Both exact and
1540 // inexact types must flatten to the same alias class so
1541 // use NotNull as the PTR.
1542 if ( offset == Type::OffsetBot || (offset >= 0 && (size_t)offset < sizeof(Klass)) ) {
1543
1544 tj = tk = TypeKlassPtr::make(TypePtr::NotNull,
1545 TypeKlassPtr::OBJECT->klass(),
1546 Type::Offset(offset));
1547 }
1548
1549 ciKlass* klass = tk->klass();
1550 if (klass != NULL && klass->is_obj_array_klass()) {
1551 ciKlass* k = TypeAryPtr::OOPS->klass();
1552 if( !k || !k->is_loaded() ) // Only fails for some -Xcomp runs
1553 k = TypeInstPtr::BOTTOM->klass();
1554 tj = tk = TypeKlassPtr::make(TypePtr::NotNull, k, Type::Offset(offset));
1555 }
1556
1557 // Check for precise loads from the primary supertype array and force them
1558 // to the supertype cache alias index. Check for generic array loads from
1559 // the primary supertype array and also force them to the supertype cache
1560 // alias index. Since the same load can reach both, we need to merge
1561 // these 2 disparate memories into the same alias class. Since the
1562 // primary supertype array is read-only, there's no chance of confusion
1563 // where we bypass an array load and an array store.
1564 int primary_supers_offset = in_bytes(Klass::primary_supers_offset());
1565 if (offset == Type::OffsetBot ||
1566 (offset >= primary_supers_offset &&
1567 offset < (int)(primary_supers_offset + Klass::primary_super_limit() * wordSize)) ||
1568 offset == (int)in_bytes(Klass::secondary_super_cache_offset())) {
1569 offset = in_bytes(Klass::secondary_super_cache_offset());
1570 tj = tk = TypeKlassPtr::make(TypePtr::NotNull, tk->klass(), Type::Offset(offset));
1571 }
1572 }
1573
1574 // Flatten all Raw pointers together.
1575 if (tj->base() == Type::RawPtr)
1576 tj = TypeRawPtr::BOTTOM;
1577
1578 if (tj->base() == Type::AnyPtr)
1579 tj = TypePtr::BOTTOM; // An error, which the caller must check for.
1580
1581 // Flatten all to bottom for now
1582 switch( _AliasLevel ) {
1583 case 0:
1584 tj = TypePtr::BOTTOM;
1585 break;
1586 case 1: // Flatten to: oop, static, field or array
1587 switch (tj->base()) {
1588 //case Type::AryPtr: tj = TypeAryPtr::RANGE; break;
1589 case Type::RawPtr: tj = TypeRawPtr::BOTTOM; break;
1590 case Type::AryPtr: // do not distinguish arrays at all
1591 case Type::InstPtr: tj = TypeInstPtr::BOTTOM; break;
1592 case Type::KlassPtr: tj = TypeKlassPtr::OBJECT; break;
1593 case Type::AnyPtr: tj = TypePtr::BOTTOM; break; // caller checks it
1594 default: ShouldNotReachHere();
1595 }
1596 break;
1597 case 2: // No collapsing at level 2; keep all splits
1598 case 3: // No collapsing at level 3; keep all splits
1599 break;
1600 default:
1601 Unimplemented();
1602 }
1603
1604 offset = tj->offset();
1605 assert( offset != Type::OffsetTop, "Offset has fallen from constant" );
1606
1607 assert( (offset != Type::OffsetBot && tj->base() != Type::AryPtr) ||
1608 (offset == Type::OffsetBot && tj->base() == Type::AryPtr) ||
1609 (offset == Type::OffsetBot && tj == TypeOopPtr::BOTTOM) ||
1610 (offset == Type::OffsetBot && tj == TypePtr::BOTTOM) ||
1611 (offset == oopDesc::mark_offset_in_bytes() && tj->base() == Type::AryPtr) ||
1612 (offset == oopDesc::klass_offset_in_bytes() && tj->base() == Type::AryPtr) ||
1613 (offset == arrayOopDesc::length_offset_in_bytes() && tj->base() == Type::AryPtr) ,
1614 "For oops, klasses, raw offset must be constant; for arrays the offset is never known" );
1615 assert( tj->ptr() != TypePtr::TopPTR &&
1616 tj->ptr() != TypePtr::AnyNull &&
1617 tj->ptr() != TypePtr::Null, "No imprecise addresses" );
1618 // assert( tj->ptr() != TypePtr::Constant ||
1619 // tj->base() == Type::RawPtr ||
1620 // tj->base() == Type::KlassPtr, "No constant oop addresses" );
1621
1622 return tj;
1623 }
1624
1625 void Compile::AliasType::Init(int i, const TypePtr* at) {
1626 _index = i;
1627 _adr_type = at;
1628 _field = NULL;
1629 _element = NULL;
1630 _is_rewritable = true; // default
1631 const TypeOopPtr *atoop = (at != NULL) ? at->isa_oopptr() : NULL;
1632 if (atoop != NULL && atoop->is_known_instance()) {
1633 const TypeOopPtr *gt = atoop->cast_to_instance_id(TypeOopPtr::InstanceBot);
1634 _general_index = Compile::current()->get_alias_index(gt);
1635 } else {
1636 _general_index = 0;
1637 }
1638 }
1639
1640 BasicType Compile::AliasType::basic_type() const {
1641 if (element() != NULL) {
1642 const Type* element = adr_type()->is_aryptr()->elem();
1643 return element->isa_narrowoop() ? T_OBJECT : element->array_element_basic_type();
1644 } if (field() != NULL) {
1645 return field()->layout_type();
1646 } else {
1647 return T_ILLEGAL; // unknown
1648 }
1649 }
1650
1651 //---------------------------------print_on------------------------------------
1652 #ifndef PRODUCT
1653 void Compile::AliasType::print_on(outputStream* st) {
1654 if (index() < 10)
1655 st->print("@ <%d> ", index());
1656 else st->print("@ <%d>", index());
1657 st->print(is_rewritable() ? " " : " RO");
1658 int offset = adr_type()->offset();
1659 if (offset == Type::OffsetBot)
1660 st->print(" +any");
1661 else st->print(" +%-3d", offset);
1662 st->print(" in ");
1663 adr_type()->dump_on(st);
1664 const TypeOopPtr* tjp = adr_type()->isa_oopptr();
1665 if (field() != NULL && tjp) {
1666 if (tjp->klass() != field()->holder() ||
1667 tjp->offset() != field()->offset_in_bytes()) {
1668 st->print(" != ");
1669 field()->print();
1670 st->print(" ***");
1671 }
1672 }
1673 }
1674
1675 void print_alias_types() {
1676 Compile* C = Compile::current();
1677 tty->print_cr("--- Alias types, AliasIdxBot .. %d", C->num_alias_types()-1);
1678 for (int idx = Compile::AliasIdxBot; idx < C->num_alias_types(); idx++) {
1679 C->alias_type(idx)->print_on(tty);
1680 tty->cr();
1681 }
1682 }
1683 #endif
1684
1685
1686 //----------------------------probe_alias_cache--------------------------------
1687 Compile::AliasCacheEntry* Compile::probe_alias_cache(const TypePtr* adr_type) {
1688 intptr_t key = (intptr_t) adr_type;
1689 key ^= key >> logAliasCacheSize;
1690 return &_alias_cache[key & right_n_bits(logAliasCacheSize)];
1691 }
1692
1693
1694 //-----------------------------grow_alias_types--------------------------------
1695 void Compile::grow_alias_types() {
1696 const int old_ats = _max_alias_types; // how many before?
1697 const int new_ats = old_ats; // how many more?
1698 const int grow_ats = old_ats+new_ats; // how many now?
1699 _max_alias_types = grow_ats;
1700 _alias_types = REALLOC_ARENA_ARRAY(comp_arena(), AliasType*, _alias_types, old_ats, grow_ats);
1701 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, new_ats);
1702 Copy::zero_to_bytes(ats, sizeof(AliasType)*new_ats);
1703 for (int i = 0; i < new_ats; i++) _alias_types[old_ats+i] = &ats[i];
1704 }
1705
1706
1707 //--------------------------------find_alias_type------------------------------
1708 Compile::AliasType* Compile::find_alias_type(const TypePtr* adr_type, bool no_create, ciField* original_field) {
1709 if (_AliasLevel == 0)
1710 return alias_type(AliasIdxBot);
1711
1712 AliasCacheEntry* ace = probe_alias_cache(adr_type);
1713 if (ace->_adr_type == adr_type) {
1714 return alias_type(ace->_index);
1715 }
1716
1717 // Handle special cases.
1718 if (adr_type == NULL) return alias_type(AliasIdxTop);
1719 if (adr_type == TypePtr::BOTTOM) return alias_type(AliasIdxBot);
1720
1721 // Do it the slow way.
1722 const TypePtr* flat = flatten_alias_type(adr_type);
1723
1724 #ifdef ASSERT
1725 {
1726 ResourceMark rm;
1727 assert(flat == flatten_alias_type(flat), "not idempotent: adr_type = %s; flat = %s => %s",
1728 Type::str(adr_type), Type::str(flat), Type::str(flatten_alias_type(flat)));
1729 assert(flat != TypePtr::BOTTOM, "cannot alias-analyze an untyped ptr: adr_type = %s",
1730 Type::str(adr_type));
1731 if (flat->isa_oopptr() && !flat->isa_klassptr()) {
1732 const TypeOopPtr* foop = flat->is_oopptr();
1733 // Scalarizable allocations have exact klass always.
1734 bool exact = !foop->klass_is_exact() || foop->is_known_instance();
1735 const TypePtr* xoop = foop->cast_to_exactness(exact)->is_ptr();
1736 assert(foop == flatten_alias_type(xoop), "exactness must not affect alias type: foop = %s; xoop = %s",
1737 Type::str(foop), Type::str(xoop));
1738 }
1739 }
1740 #endif
1741
1742 int idx = AliasIdxTop;
1743 for (int i = 0; i < num_alias_types(); i++) {
1744 if (alias_type(i)->adr_type() == flat) {
1745 idx = i;
1746 break;
1747 }
1748 }
1749
1750 if (idx == AliasIdxTop) {
1751 if (no_create) return NULL;
1752 // Grow the array if necessary.
1753 if (_num_alias_types == _max_alias_types) grow_alias_types();
1754 // Add a new alias type.
1755 idx = _num_alias_types++;
1756 _alias_types[idx]->Init(idx, flat);
1757 if (flat == TypeInstPtr::KLASS) alias_type(idx)->set_rewritable(false);
1758 if (flat == TypeAryPtr::RANGE) alias_type(idx)->set_rewritable(false);
1759 if (flat->isa_instptr()) {
1760 if (flat->offset() == java_lang_Class::klass_offset_in_bytes()
1761 && flat->is_instptr()->klass() == env()->Class_klass())
1762 alias_type(idx)->set_rewritable(false);
1763 }
1764 if (flat->isa_aryptr()) {
1765 #ifdef ASSERT
1766 const int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1767 // (T_BYTE has the weakest alignment and size restrictions...)
1768 assert(flat->offset() < header_size_min, "array body reference must be OffsetBot");
1769 #endif
1770 if (flat->offset() == TypePtr::OffsetBot) {
1771 alias_type(idx)->set_element(flat->is_aryptr()->elem());
1772 }
1773 }
1774 if (flat->isa_klassptr()) {
1775 if (flat->offset() == in_bytes(Klass::super_check_offset_offset()))
1776 alias_type(idx)->set_rewritable(false);
1777 if (flat->offset() == in_bytes(Klass::modifier_flags_offset()))
1778 alias_type(idx)->set_rewritable(false);
1779 if (flat->offset() == in_bytes(Klass::access_flags_offset()))
1780 alias_type(idx)->set_rewritable(false);
1781 if (flat->offset() == in_bytes(Klass::java_mirror_offset()))
1782 alias_type(idx)->set_rewritable(false);
1783 }
1784 // %%% (We would like to finalize JavaThread::threadObj_offset(),
1785 // but the base pointer type is not distinctive enough to identify
1786 // references into JavaThread.)
1787
1788 // Check for final fields.
1789 const TypeInstPtr* tinst = flat->isa_instptr();
1790 const TypeValueTypePtr* vtptr = flat->isa_valuetypeptr();
1791 ciField* field = NULL;
1792 if (tinst && tinst->offset() >= instanceOopDesc::base_offset_in_bytes()) {
1793 if (tinst->const_oop() != NULL &&
1794 tinst->klass() == ciEnv::current()->Class_klass() &&
1795 tinst->offset() >= (tinst->klass()->as_instance_klass()->size_helper() * wordSize)) {
1796 // static field
1797 ciInstanceKlass* k = tinst->const_oop()->as_instance()->java_lang_Class_klass()->as_instance_klass();
1798 field = k->get_field_by_offset(tinst->offset(), true);
1799 } else {
1800 ciInstanceKlass *k = tinst->klass()->as_instance_klass();
1801 field = k->get_field_by_offset(tinst->offset(), false);
1802 }
1803 } else if (vtptr) {
1804 // Value type field
1805 ciValueKlass* vk = vtptr->klass()->as_value_klass();
1806 field = vk->get_field_by_offset(vtptr->offset(), false);
1807 }
1808 assert(field == NULL ||
1809 original_field == NULL ||
1810 (field->holder() == original_field->holder() &&
1811 field->offset() == original_field->offset() &&
1812 field->is_static() == original_field->is_static()), "wrong field?");
1813 // Set field() and is_rewritable() attributes.
1814 if (field != NULL) alias_type(idx)->set_field(field);
1815 }
1816
1817 // Fill the cache for next time.
1818 ace->_adr_type = adr_type;
1819 ace->_index = idx;
1820 assert(alias_type(adr_type) == alias_type(idx), "type must be installed");
1821
1822 // Might as well try to fill the cache for the flattened version, too.
1823 AliasCacheEntry* face = probe_alias_cache(flat);
1824 if (face->_adr_type == NULL) {
1825 face->_adr_type = flat;
1826 face->_index = idx;
1827 assert(alias_type(flat) == alias_type(idx), "flat type must work too");
1828 }
1829
1830 return alias_type(idx);
1831 }
1832
1833
1834 Compile::AliasType* Compile::alias_type(ciField* field) {
1835 const TypeOopPtr* t;
1836 if (field->is_static())
1837 t = TypeInstPtr::make(field->holder()->java_mirror());
1838 else
1839 t = TypeOopPtr::make_from_klass_raw(field->holder());
1840 AliasType* atp = alias_type(t->add_offset(field->offset_in_bytes()), field);
1841 assert((field->is_final() || field->is_stable()) == !atp->is_rewritable(), "must get the rewritable bits correct");
1842 return atp;
1843 }
1844
1845
1846 //------------------------------have_alias_type--------------------------------
1847 bool Compile::have_alias_type(const TypePtr* adr_type) {
1848 AliasCacheEntry* ace = probe_alias_cache(adr_type);
1849 if (ace->_adr_type == adr_type) {
1850 return true;
1851 }
1852
1853 // Handle special cases.
1854 if (adr_type == NULL) return true;
1855 if (adr_type == TypePtr::BOTTOM) return true;
1856
1857 return find_alias_type(adr_type, true, NULL) != NULL;
1858 }
1859
1860 //-----------------------------must_alias--------------------------------------
1861 // True if all values of the given address type are in the given alias category.
1862 bool Compile::must_alias(const TypePtr* adr_type, int alias_idx) {
1863 if (alias_idx == AliasIdxBot) return true; // the universal category
1864 if (adr_type == NULL) return true; // NULL serves as TypePtr::TOP
1865 if (alias_idx == AliasIdxTop) return false; // the empty category
1866 if (adr_type->base() == Type::AnyPtr) return false; // TypePtr::BOTTOM or its twins
1867
1868 // the only remaining possible overlap is identity
1869 int adr_idx = get_alias_index(adr_type);
1870 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, "");
1871 assert(adr_idx == alias_idx ||
1872 (alias_type(alias_idx)->adr_type() != TypeOopPtr::BOTTOM
1873 && adr_type != TypeOopPtr::BOTTOM),
1874 "should not be testing for overlap with an unsafe pointer");
1875 return adr_idx == alias_idx;
1876 }
1877
1878 //------------------------------can_alias--------------------------------------
1879 // True if any values of the given address type are in the given alias category.
1880 bool Compile::can_alias(const TypePtr* adr_type, int alias_idx) {
1881 if (alias_idx == AliasIdxTop) return false; // the empty category
1882 if (adr_type == NULL) return false; // NULL serves as TypePtr::TOP
1883 if (alias_idx == AliasIdxBot) return true; // the universal category
1884 if (adr_type->base() == Type::AnyPtr) return true; // TypePtr::BOTTOM or its twins
1885
1886 // the only remaining possible overlap is identity
1887 int adr_idx = get_alias_index(adr_type);
1888 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, "");
1889 return adr_idx == alias_idx;
1890 }
1891
1892
1893
1894 //---------------------------pop_warm_call-------------------------------------
1895 WarmCallInfo* Compile::pop_warm_call() {
1896 WarmCallInfo* wci = _warm_calls;
1897 if (wci != NULL) _warm_calls = wci->remove_from(wci);
1898 return wci;
1899 }
1900
1901 //----------------------------Inline_Warm--------------------------------------
1902 int Compile::Inline_Warm() {
1903 // If there is room, try to inline some more warm call sites.
1904 // %%% Do a graph index compaction pass when we think we're out of space?
1905 if (!InlineWarmCalls) return 0;
1906
1907 int calls_made_hot = 0;
1908 int room_to_grow = NodeCountInliningCutoff - unique();
1909 int amount_to_grow = MIN2(room_to_grow, (int)NodeCountInliningStep);
1910 int amount_grown = 0;
1911 WarmCallInfo* call;
1912 while (amount_to_grow > 0 && (call = pop_warm_call()) != NULL) {
1913 int est_size = (int)call->size();
1914 if (est_size > (room_to_grow - amount_grown)) {
1915 // This one won't fit anyway. Get rid of it.
1916 call->make_cold();
1917 continue;
1918 }
1919 call->make_hot();
1920 calls_made_hot++;
1921 amount_grown += est_size;
1922 amount_to_grow -= est_size;
1923 }
1924
1925 if (calls_made_hot > 0) set_major_progress();
1926 return calls_made_hot;
1927 }
1928
1929
1930 //----------------------------Finish_Warm--------------------------------------
1931 void Compile::Finish_Warm() {
1932 if (!InlineWarmCalls) return;
1933 if (failing()) return;
1934 if (warm_calls() == NULL) return;
1935
1936 // Clean up loose ends, if we are out of space for inlining.
1937 WarmCallInfo* call;
1938 while ((call = pop_warm_call()) != NULL) {
1939 call->make_cold();
1940 }
1941 }
1942
1943 //---------------------cleanup_loop_predicates-----------------------
1944 // Remove the opaque nodes that protect the predicates so that all unused
1945 // checks and uncommon_traps will be eliminated from the ideal graph
1946 void Compile::cleanup_loop_predicates(PhaseIterGVN &igvn) {
1947 if (predicate_count()==0) return;
1948 for (int i = predicate_count(); i > 0; i--) {
1949 Node * n = predicate_opaque1_node(i-1);
1950 assert(n->Opcode() == Op_Opaque1, "must be");
1951 igvn.replace_node(n, n->in(1));
1952 }
1953 assert(predicate_count()==0, "should be clean!");
1954 }
1955
1956 void Compile::add_range_check_cast(Node* n) {
1957 assert(n->isa_CastII()->has_range_check(), "CastII should have range check dependency");
1958 assert(!_range_check_casts->contains(n), "duplicate entry in range check casts");
1959 _range_check_casts->append(n);
1960 }
1961
1962 // Remove all range check dependent CastIINodes.
1963 void Compile::remove_range_check_casts(PhaseIterGVN &igvn) {
1964 for (int i = range_check_cast_count(); i > 0; i--) {
1965 Node* cast = range_check_cast_node(i-1);
1966 assert(cast->isa_CastII()->has_range_check(), "CastII should have range check dependency");
1967 igvn.replace_node(cast, cast->in(1));
1968 }
1969 assert(range_check_cast_count() == 0, "should be empty");
1970 }
1971
1972 void Compile::add_value_type_ptr(ValueTypePtrNode* n) {
1973 assert(can_add_value_type_ptr(), "too late");
1974 assert(!_value_type_ptr_nodes->contains(n), "duplicate entry");
1975 _value_type_ptr_nodes->append(n);
1976 }
1977
1978 void Compile::process_value_type_ptr_nodes(PhaseIterGVN &igvn) {
1979 for (int i = value_type_ptr_count(); i > 0; i--) {
1980 ValueTypePtrNode* vtptr = value_type_ptr(i-1);
1981 // once all inlining is over otherwise debug info can get
1982 // inconsistent
1983 vtptr->make_scalar_in_safepoints(igvn.C->root(), &igvn);
1984 igvn.replace_node(vtptr, vtptr->get_oop());
1985 }
1986 assert(value_type_ptr_count() == 0, "should be empty");
1987 _value_type_ptr_nodes = NULL;
1988 igvn.optimize();
1989 }
1990
1991 // StringOpts and late inlining of string methods
1992 void Compile::inline_string_calls(bool parse_time) {
1993 {
1994 // remove useless nodes to make the usage analysis simpler
1995 ResourceMark rm;
1996 PhaseRemoveUseless pru(initial_gvn(), for_igvn());
1997 }
1998
1999 {
2000 ResourceMark rm;
2001 print_method(PHASE_BEFORE_STRINGOPTS, 3);
2002 PhaseStringOpts pso(initial_gvn(), for_igvn());
2003 print_method(PHASE_AFTER_STRINGOPTS, 3);
2004 }
2005
2006 // now inline anything that we skipped the first time around
2007 if (!parse_time) {
2008 _late_inlines_pos = _late_inlines.length();
2009 }
2010
2011 while (_string_late_inlines.length() > 0) {
2012 CallGenerator* cg = _string_late_inlines.pop();
2013 cg->do_late_inline();
2014 if (failing()) return;
2015 }
2016 _string_late_inlines.trunc_to(0);
2017 }
2018
2019 // Late inlining of boxing methods
2020 void Compile::inline_boxing_calls(PhaseIterGVN& igvn) {
2021 if (_boxing_late_inlines.length() > 0) {
2022 assert(has_boxed_value(), "inconsistent");
2023
2024 PhaseGVN* gvn = initial_gvn();
2025 set_inlining_incrementally(true);
2026
2027 assert( igvn._worklist.size() == 0, "should be done with igvn" );
2028 for_igvn()->clear();
2029 gvn->replace_with(&igvn);
2030
2031 _late_inlines_pos = _late_inlines.length();
2032
2033 while (_boxing_late_inlines.length() > 0) {
2034 CallGenerator* cg = _boxing_late_inlines.pop();
2035 cg->do_late_inline();
2036 if (failing()) return;
2037 }
2038 _boxing_late_inlines.trunc_to(0);
2039
2040 {
2041 ResourceMark rm;
2042 PhaseRemoveUseless pru(gvn, for_igvn());
2043 }
2044
2045 igvn = PhaseIterGVN(gvn);
2046 igvn.optimize();
2047
2048 set_inlining_progress(false);
2049 set_inlining_incrementally(false);
2050 }
2051 }
2052
2053 void Compile::inline_incrementally_one(PhaseIterGVN& igvn) {
2054 assert(IncrementalInline, "incremental inlining should be on");
2055 PhaseGVN* gvn = initial_gvn();
2056
2057 set_inlining_progress(false);
2058 for_igvn()->clear();
2059 gvn->replace_with(&igvn);
2060
2061 {
2062 TracePhase tp("incrementalInline_inline", &timers[_t_incrInline_inline]);
2063 int i = 0;
2064 for (; i <_late_inlines.length() && !inlining_progress(); i++) {
2065 CallGenerator* cg = _late_inlines.at(i);
2066 _late_inlines_pos = i+1;
2067 cg->do_late_inline();
2068 if (failing()) return;
2069 }
2070 int j = 0;
2071 for (; i < _late_inlines.length(); i++, j++) {
2072 _late_inlines.at_put(j, _late_inlines.at(i));
2073 }
2074 _late_inlines.trunc_to(j);
2075 }
2076
2077 {
2078 TracePhase tp("incrementalInline_pru", &timers[_t_incrInline_pru]);
2079 ResourceMark rm;
2080 PhaseRemoveUseless pru(gvn, for_igvn());
2081 }
2082
2083 {
2084 TracePhase tp("incrementalInline_igvn", &timers[_t_incrInline_igvn]);
2085 igvn = PhaseIterGVN(gvn);
2086 }
2087 }
2088
2089 // Perform incremental inlining until bound on number of live nodes is reached
2090 void Compile::inline_incrementally(PhaseIterGVN& igvn) {
2091 TracePhase tp("incrementalInline", &timers[_t_incrInline]);
2092
2093 PhaseGVN* gvn = initial_gvn();
2094
2095 set_inlining_incrementally(true);
2096 set_inlining_progress(true);
2097 uint low_live_nodes = 0;
2098
2099 while(inlining_progress() && _late_inlines.length() > 0) {
2100
2101 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) {
2102 if (low_live_nodes < (uint)LiveNodeCountInliningCutoff * 8 / 10) {
2103 TracePhase tp("incrementalInline_ideal", &timers[_t_incrInline_ideal]);
2104 // PhaseIdealLoop is expensive so we only try it once we are
2105 // out of live nodes and we only try it again if the previous
2106 // helped got the number of nodes down significantly
2107 PhaseIdealLoop ideal_loop( igvn, false, true );
2108 if (failing()) return;
2109 low_live_nodes = live_nodes();
2110 _major_progress = true;
2111 }
2112
2113 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) {
2114 break;
2115 }
2116 }
2117
2118 inline_incrementally_one(igvn);
2119
2120 if (failing()) return;
2121
2122 {
2123 TracePhase tp("incrementalInline_igvn", &timers[_t_incrInline_igvn]);
2124 igvn.optimize();
2125 }
2126
2127 if (failing()) return;
2128 }
2129
2130 assert( igvn._worklist.size() == 0, "should be done with igvn" );
2131
2132 if (_string_late_inlines.length() > 0) {
2133 assert(has_stringbuilder(), "inconsistent");
2134 for_igvn()->clear();
2135 initial_gvn()->replace_with(&igvn);
2136
2137 inline_string_calls(false);
2138
2139 if (failing()) return;
2140
2141 {
2142 TracePhase tp("incrementalInline_pru", &timers[_t_incrInline_pru]);
2143 ResourceMark rm;
2144 PhaseRemoveUseless pru(initial_gvn(), for_igvn());
2145 }
2146
2147 {
2148 TracePhase tp("incrementalInline_igvn", &timers[_t_incrInline_igvn]);
2149 igvn = PhaseIterGVN(gvn);
2150 igvn.optimize();
2151 }
2152 }
2153
2154 set_inlining_incrementally(false);
2155 }
2156
2157
2158 //------------------------------Optimize---------------------------------------
2159 // Given a graph, optimize it.
2160 void Compile::Optimize() {
2161 TracePhase tp("optimizer", &timers[_t_optimizer]);
2162
2163 #ifndef PRODUCT
2164 if (_directive->BreakAtCompileOption) {
2165 BREAKPOINT;
2166 }
2167
2168 #endif
2169
2170 ResourceMark rm;
2171 int loop_opts_cnt;
2172
2173 print_inlining_reinit();
2174
2175 NOT_PRODUCT( verify_graph_edges(); )
2176
2177 print_method(PHASE_AFTER_PARSING);
2178
2179 {
2180 // Iterative Global Value Numbering, including ideal transforms
2181 // Initialize IterGVN with types and values from parse-time GVN
2182 PhaseIterGVN igvn(initial_gvn());
2183 #ifdef ASSERT
2184 _modified_nodes = new (comp_arena()) Unique_Node_List(comp_arena());
2185 #endif
2186 {
2187 TracePhase tp("iterGVN", &timers[_t_iterGVN]);
2188 igvn.optimize();
2189 }
2190
2191 print_method(PHASE_ITER_GVN1, 2);
2192
2193 if (failing()) return;
2194
2195 inline_incrementally(igvn);
2196
2197 print_method(PHASE_INCREMENTAL_INLINE, 2);
2198
2199 if (failing()) return;
2200
2201 if (eliminate_boxing()) {
2202 // Inline valueOf() methods now.
2203 inline_boxing_calls(igvn);
2204
2205 if (AlwaysIncrementalInline) {
2206 inline_incrementally(igvn);
2207 }
2208
2209 print_method(PHASE_INCREMENTAL_BOXING_INLINE, 2);
2210
2211 if (failing()) return;
2212 }
2213
2214 // Remove the speculative part of types and clean up the graph from
2215 // the extra CastPP nodes whose only purpose is to carry them. Do
2216 // that early so that optimizations are not disrupted by the extra
2217 // CastPP nodes.
2218 remove_speculative_types(igvn);
2219
2220 // No more new expensive nodes will be added to the list from here
2221 // so keep only the actual candidates for optimizations.
2222 cleanup_expensive_nodes(igvn);
2223
2224 if (!failing() && RenumberLiveNodes && live_nodes() + NodeLimitFudgeFactor < unique()) {
2225 Compile::TracePhase tp("", &timers[_t_renumberLive]);
2226 initial_gvn()->replace_with(&igvn);
2227 for_igvn()->clear();
2228 Unique_Node_List new_worklist(C->comp_arena());
2229 {
2230 ResourceMark rm;
2231 PhaseRenumberLive prl = PhaseRenumberLive(initial_gvn(), for_igvn(), &new_worklist);
2232 }
2233 set_for_igvn(&new_worklist);
2234 igvn = PhaseIterGVN(initial_gvn());
2235 igvn.optimize();
2236 }
2237
2238 if (value_type_ptr_count() > 0) {
2239 process_value_type_ptr_nodes(igvn);
2240 }
2241
2242 // Perform escape analysis
2243 if (_do_escape_analysis && ConnectionGraph::has_candidates(this)) {
2244 if (has_loops()) {
2245 // Cleanup graph (remove dead nodes).
2246 TracePhase tp("idealLoop", &timers[_t_idealLoop]);
2247 PhaseIdealLoop ideal_loop( igvn, false, true );
2248 if (major_progress()) print_method(PHASE_PHASEIDEAL_BEFORE_EA, 2);
2249 if (failing()) return;
2250 }
2251 ConnectionGraph::do_analysis(this, &igvn);
2252
2253 if (failing()) return;
2254
2255 // Optimize out fields loads from scalar replaceable allocations.
2256 igvn.optimize();
2257 print_method(PHASE_ITER_GVN_AFTER_EA, 2);
2258
2259 if (failing()) return;
2260
2261 if (congraph() != NULL && macro_count() > 0) {
2262 TracePhase tp("macroEliminate", &timers[_t_macroEliminate]);
2263 PhaseMacroExpand mexp(igvn);
2264 mexp.eliminate_macro_nodes();
2265 igvn.set_delay_transform(false);
2266
2267 igvn.optimize();
2268 print_method(PHASE_ITER_GVN_AFTER_ELIMINATION, 2);
2269
2270 if (failing()) return;
2271 }
2272 }
2273
2274 // Loop transforms on the ideal graph. Range Check Elimination,
2275 // peeling, unrolling, etc.
2276
2277 // Set loop opts counter
2278 loop_opts_cnt = num_loop_opts();
2279 if((loop_opts_cnt > 0) && (has_loops() || has_split_ifs())) {
2280 {
2281 TracePhase tp("idealLoop", &timers[_t_idealLoop]);
2282 PhaseIdealLoop ideal_loop( igvn, true );
2283 loop_opts_cnt--;
2284 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP1, 2);
2285 if (failing()) return;
2286 }
2287 // Loop opts pass if partial peeling occurred in previous pass
2288 if(PartialPeelLoop && major_progress() && (loop_opts_cnt > 0)) {
2289 TracePhase tp("idealLoop", &timers[_t_idealLoop]);
2290 PhaseIdealLoop ideal_loop( igvn, false );
2291 loop_opts_cnt--;
2292 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP2, 2);
2293 if (failing()) return;
2294 }
2295 // Loop opts pass for loop-unrolling before CCP
2296 if(major_progress() && (loop_opts_cnt > 0)) {
2297 TracePhase tp("idealLoop", &timers[_t_idealLoop]);
2298 PhaseIdealLoop ideal_loop( igvn, false );
2299 loop_opts_cnt--;
2300 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP3, 2);
2301 }
2302 if (!failing()) {
2303 // Verify that last round of loop opts produced a valid graph
2304 TracePhase tp("idealLoopVerify", &timers[_t_idealLoopVerify]);
2305 PhaseIdealLoop::verify(igvn);
2306 }
2307 }
2308 if (failing()) return;
2309
2310 // Conditional Constant Propagation;
2311 PhaseCCP ccp( &igvn );
2312 assert( true, "Break here to ccp.dump_nodes_and_types(_root,999,1)");
2313 {
2314 TracePhase tp("ccp", &timers[_t_ccp]);
2315 ccp.do_transform();
2316 }
2317 print_method(PHASE_CPP1, 2);
2318
2319 assert( true, "Break here to ccp.dump_old2new_map()");
2320
2321 // Iterative Global Value Numbering, including ideal transforms
2322 {
2323 TracePhase tp("iterGVN2", &timers[_t_iterGVN2]);
2324 igvn = ccp;
2325 igvn.optimize();
2326 }
2327
2328 print_method(PHASE_ITER_GVN2, 2);
2329
2330 if (failing()) return;
2331
2332 // Loop transforms on the ideal graph. Range Check Elimination,
2333 // peeling, unrolling, etc.
2334 if(loop_opts_cnt > 0) {
2335 debug_only( int cnt = 0; );
2336 while(major_progress() && (loop_opts_cnt > 0)) {
2337 TracePhase tp("idealLoop", &timers[_t_idealLoop]);
2338 assert( cnt++ < 40, "infinite cycle in loop optimization" );
2339 PhaseIdealLoop ideal_loop( igvn, true);
2340 loop_opts_cnt--;
2341 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP_ITERATIONS, 2);
2342 if (failing()) return;
2343 }
2344 }
2345 // Ensure that major progress is now clear
2346 C->clear_major_progress();
2347
2348 {
2349 // Verify that all previous optimizations produced a valid graph
2350 // at least to this point, even if no loop optimizations were done.
2351 TracePhase tp("idealLoopVerify", &timers[_t_idealLoopVerify]);
2352 PhaseIdealLoop::verify(igvn);
2353 }
2354
2355 if (range_check_cast_count() > 0) {
2356 // No more loop optimizations. Remove all range check dependent CastIINodes.
2357 C->remove_range_check_casts(igvn);
2358 igvn.optimize();
2359 }
2360
2361 {
2362 TracePhase tp("macroExpand", &timers[_t_macroExpand]);
2363 PhaseMacroExpand mex(igvn);
2364 if (mex.expand_macro_nodes()) {
2365 assert(failing(), "must bail out w/ explicit message");
2366 return;
2367 }
2368 }
2369
2370 DEBUG_ONLY( _modified_nodes = NULL; )
2371 } // (End scope of igvn; run destructor if necessary for asserts.)
2372
2373 process_print_inlining();
2374 // A method with only infinite loops has no edges entering loops from root
2375 {
2376 TracePhase tp("graphReshape", &timers[_t_graphReshaping]);
2377 if (final_graph_reshaping()) {
2378 assert(failing(), "must bail out w/ explicit message");
2379 return;
2380 }
2381 }
2382
2383 print_method(PHASE_OPTIMIZE_FINISHED, 2);
2384 }
2385
2386 // Fixme remove
2387 static void check_for_value_node(Node &n, void* C) {
2388 if (n.is_ValueType()) {
2389 #ifdef ASSERT
2390 ((Compile*)C)->method()->print_short_name();
2391 tty->print_cr("");
2392 n.dump(-1);
2393 assert(false, "Unable to match ValueTypeNode");
2394 #endif
2395 ((Compile*)C)->record_failure("Unable to match ValueTypeNode");
2396 }
2397 }
2398
2399 //------------------------------Code_Gen---------------------------------------
2400 // Given a graph, generate code for it
2401 void Compile::Code_Gen() {
2402 // FIXME remove
2403 root()->walk(Node::nop, check_for_value_node, this);
2404
2405 if (failing()) {
2406 return;
2407 }
2408
2409 // Perform instruction selection. You might think we could reclaim Matcher
2410 // memory PDQ, but actually the Matcher is used in generating spill code.
2411 // Internals of the Matcher (including some VectorSets) must remain live
2412 // for awhile - thus I cannot reclaim Matcher memory lest a VectorSet usage
2413 // set a bit in reclaimed memory.
2414
2415 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine
2416 // nodes. Mapping is only valid at the root of each matched subtree.
2417 NOT_PRODUCT( verify_graph_edges(); )
2418
2419 Matcher matcher;
2420 _matcher = &matcher;
2421 {
2422 TracePhase tp("matcher", &timers[_t_matcher]);
2423 matcher.match();
2424 }
2425 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine
2426 // nodes. Mapping is only valid at the root of each matched subtree.
2427 NOT_PRODUCT( verify_graph_edges(); )
2428
2429 // If you have too many nodes, or if matching has failed, bail out
2430 check_node_count(0, "out of nodes matching instructions");
2431 if (failing()) {
2432 return;
2433 }
2434
2435 // Build a proper-looking CFG
2436 PhaseCFG cfg(node_arena(), root(), matcher);
2437 _cfg = &cfg;
2438 {
2439 TracePhase tp("scheduler", &timers[_t_scheduler]);
2440 bool success = cfg.do_global_code_motion();
2441 if (!success) {
2442 return;
2443 }
2444
2445 print_method(PHASE_GLOBAL_CODE_MOTION, 2);
2446 NOT_PRODUCT( verify_graph_edges(); )
2447 debug_only( cfg.verify(); )
2448 }
2449
2450 PhaseChaitin regalloc(unique(), cfg, matcher, false);
2451 _regalloc = ®alloc;
2452 {
2453 TracePhase tp("regalloc", &timers[_t_registerAllocation]);
2454 // Perform register allocation. After Chaitin, use-def chains are
2455 // no longer accurate (at spill code) and so must be ignored.
2456 // Node->LRG->reg mappings are still accurate.
2457 _regalloc->Register_Allocate();
2458
2459 // Bail out if the allocator builds too many nodes
2460 if (failing()) {
2461 return;
2462 }
2463 }
2464
2465 // Prior to register allocation we kept empty basic blocks in case the
2466 // the allocator needed a place to spill. After register allocation we
2467 // are not adding any new instructions. If any basic block is empty, we
2468 // can now safely remove it.
2469 {
2470 TracePhase tp("blockOrdering", &timers[_t_blockOrdering]);
2471 cfg.remove_empty_blocks();
2472 if (do_freq_based_layout()) {
2473 PhaseBlockLayout layout(cfg);
2474 } else {
2475 cfg.set_loop_alignment();
2476 }
2477 cfg.fixup_flow();
2478 }
2479
2480 // Apply peephole optimizations
2481 if( OptoPeephole ) {
2482 TracePhase tp("peephole", &timers[_t_peephole]);
2483 PhasePeephole peep( _regalloc, cfg);
2484 peep.do_transform();
2485 }
2486
2487 // Do late expand if CPU requires this.
2488 if (Matcher::require_postalloc_expand) {
2489 TracePhase tp("postalloc_expand", &timers[_t_postalloc_expand]);
2490 cfg.postalloc_expand(_regalloc);
2491 }
2492
2493 // Convert Nodes to instruction bits in a buffer
2494 {
2495 TraceTime tp("output", &timers[_t_output], CITime);
2496 Output();
2497 }
2498
2499 print_method(PHASE_FINAL_CODE);
2500
2501 // He's dead, Jim.
2502 _cfg = (PhaseCFG*)0xdeadbeef;
2503 _regalloc = (PhaseChaitin*)0xdeadbeef;
2504 }
2505
2506
2507 //------------------------------dump_asm---------------------------------------
2508 // Dump formatted assembly
2509 #ifndef PRODUCT
2510 void Compile::dump_asm(int *pcs, uint pc_limit) {
2511 bool cut_short = false;
2512 tty->print_cr("#");
2513 tty->print("# "); _tf->dump(); tty->cr();
2514 tty->print_cr("#");
2515
2516 // For all blocks
2517 int pc = 0x0; // Program counter
2518 char starts_bundle = ' ';
2519 _regalloc->dump_frame();
2520
2521 Node *n = NULL;
2522 for (uint i = 0; i < _cfg->number_of_blocks(); i++) {
2523 if (VMThread::should_terminate()) {
2524 cut_short = true;
2525 break;
2526 }
2527 Block* block = _cfg->get_block(i);
2528 if (block->is_connector() && !Verbose) {
2529 continue;
2530 }
2531 n = block->head();
2532 if (pcs && n->_idx < pc_limit) {
2533 tty->print("%3.3x ", pcs[n->_idx]);
2534 } else {
2535 tty->print(" ");
2536 }
2537 block->dump_head(_cfg);
2538 if (block->is_connector()) {
2539 tty->print_cr(" # Empty connector block");
2540 } else if (block->num_preds() == 2 && block->pred(1)->is_CatchProj() && block->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) {
2541 tty->print_cr(" # Block is sole successor of call");
2542 }
2543
2544 // For all instructions
2545 Node *delay = NULL;
2546 for (uint j = 0; j < block->number_of_nodes(); j++) {
2547 if (VMThread::should_terminate()) {
2548 cut_short = true;
2549 break;
2550 }
2551 n = block->get_node(j);
2552 if (valid_bundle_info(n)) {
2553 Bundle* bundle = node_bundling(n);
2554 if (bundle->used_in_unconditional_delay()) {
2555 delay = n;
2556 continue;
2557 }
2558 if (bundle->starts_bundle()) {
2559 starts_bundle = '+';
2560 }
2561 }
2562
2563 if (WizardMode) {
2564 n->dump();
2565 }
2566
2567 if( !n->is_Region() && // Dont print in the Assembly
2568 !n->is_Phi() && // a few noisely useless nodes
2569 !n->is_Proj() &&
2570 !n->is_MachTemp() &&
2571 !n->is_SafePointScalarObject() &&
2572 !n->is_Catch() && // Would be nice to print exception table targets
2573 !n->is_MergeMem() && // Not very interesting
2574 !n->is_top() && // Debug info table constants
2575 !(n->is_Con() && !n->is_Mach())// Debug info table constants
2576 ) {
2577 if (pcs && n->_idx < pc_limit)
2578 tty->print("%3.3x", pcs[n->_idx]);
2579 else
2580 tty->print(" ");
2581 tty->print(" %c ", starts_bundle);
2582 starts_bundle = ' ';
2583 tty->print("\t");
2584 n->format(_regalloc, tty);
2585 tty->cr();
2586 }
2587
2588 // If we have an instruction with a delay slot, and have seen a delay,
2589 // then back up and print it
2590 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
2591 assert(delay != NULL, "no unconditional delay instruction");
2592 if (WizardMode) delay->dump();
2593
2594 if (node_bundling(delay)->starts_bundle())
2595 starts_bundle = '+';
2596 if (pcs && n->_idx < pc_limit)
2597 tty->print("%3.3x", pcs[n->_idx]);
2598 else
2599 tty->print(" ");
2600 tty->print(" %c ", starts_bundle);
2601 starts_bundle = ' ';
2602 tty->print("\t");
2603 delay->format(_regalloc, tty);
2604 tty->cr();
2605 delay = NULL;
2606 }
2607
2608 // Dump the exception table as well
2609 if( n->is_Catch() && (Verbose || WizardMode) ) {
2610 // Print the exception table for this offset
2611 _handler_table.print_subtable_for(pc);
2612 }
2613 }
2614
2615 if (pcs && n->_idx < pc_limit)
2616 tty->print_cr("%3.3x", pcs[n->_idx]);
2617 else
2618 tty->cr();
2619
2620 assert(cut_short || delay == NULL, "no unconditional delay branch");
2621
2622 } // End of per-block dump
2623 tty->cr();
2624
2625 if (cut_short) tty->print_cr("*** disassembly is cut short ***");
2626 }
2627 #endif
2628
2629 //------------------------------Final_Reshape_Counts---------------------------
2630 // This class defines counters to help identify when a method
2631 // may/must be executed using hardware with only 24-bit precision.
2632 struct Final_Reshape_Counts : public StackObj {
2633 int _call_count; // count non-inlined 'common' calls
2634 int _float_count; // count float ops requiring 24-bit precision
2635 int _double_count; // count double ops requiring more precision
2636 int _java_call_count; // count non-inlined 'java' calls
2637 int _inner_loop_count; // count loops which need alignment
2638 VectorSet _visited; // Visitation flags
2639 Node_List _tests; // Set of IfNodes & PCTableNodes
2640
2641 Final_Reshape_Counts() :
2642 _call_count(0), _float_count(0), _double_count(0),
2643 _java_call_count(0), _inner_loop_count(0),
2644 _visited( Thread::current()->resource_area() ) { }
2645
2646 void inc_call_count () { _call_count ++; }
2647 void inc_float_count () { _float_count ++; }
2648 void inc_double_count() { _double_count++; }
2649 void inc_java_call_count() { _java_call_count++; }
2650 void inc_inner_loop_count() { _inner_loop_count++; }
2651
2652 int get_call_count () const { return _call_count ; }
2653 int get_float_count () const { return _float_count ; }
2654 int get_double_count() const { return _double_count; }
2655 int get_java_call_count() const { return _java_call_count; }
2656 int get_inner_loop_count() const { return _inner_loop_count; }
2657 };
2658
2659 #ifdef ASSERT
2660 static bool oop_offset_is_sane(const TypeInstPtr* tp) {
2661 ciInstanceKlass *k = tp->klass()->as_instance_klass();
2662 // Make sure the offset goes inside the instance layout.
2663 return k->contains_field_offset(tp->offset());
2664 // Note that OffsetBot and OffsetTop are very negative.
2665 }
2666 #endif
2667
2668 // Eliminate trivially redundant StoreCMs and accumulate their
2669 // precedence edges.
2670 void Compile::eliminate_redundant_card_marks(Node* n) {
2671 assert(n->Opcode() == Op_StoreCM, "expected StoreCM");
2672 if (n->in(MemNode::Address)->outcnt() > 1) {
2673 // There are multiple users of the same address so it might be
2674 // possible to eliminate some of the StoreCMs
2675 Node* mem = n->in(MemNode::Memory);
2676 Node* adr = n->in(MemNode::Address);
2677 Node* val = n->in(MemNode::ValueIn);
2678 Node* prev = n;
2679 bool done = false;
2680 // Walk the chain of StoreCMs eliminating ones that match. As
2681 // long as it's a chain of single users then the optimization is
2682 // safe. Eliminating partially redundant StoreCMs would require
2683 // cloning copies down the other paths.
2684 while (mem->Opcode() == Op_StoreCM && mem->outcnt() == 1 && !done) {
2685 if (adr == mem->in(MemNode::Address) &&
2686 val == mem->in(MemNode::ValueIn)) {
2687 // redundant StoreCM
2688 if (mem->req() > MemNode::OopStore) {
2689 // Hasn't been processed by this code yet.
2690 n->add_prec(mem->in(MemNode::OopStore));
2691 } else {
2692 // Already converted to precedence edge
2693 for (uint i = mem->req(); i < mem->len(); i++) {
2694 // Accumulate any precedence edges
2695 if (mem->in(i) != NULL) {
2696 n->add_prec(mem->in(i));
2697 }
2698 }
2699 // Everything above this point has been processed.
2700 done = true;
2701 }
2702 // Eliminate the previous StoreCM
2703 prev->set_req(MemNode::Memory, mem->in(MemNode::Memory));
2704 assert(mem->outcnt() == 0, "should be dead");
2705 mem->disconnect_inputs(NULL, this);
2706 } else {
2707 prev = mem;
2708 }
2709 mem = prev->in(MemNode::Memory);
2710 }
2711 }
2712 }
2713
2714 void Compile::value_type_return_from_mh_intrinsic(CallNode *call, Final_Reshape_Counts &frc) {
2715 if (ValueTypeReturnedAsFields &&
2716 call->is_CallStaticJava() &&
2717 call->as_CallStaticJava()->method() != NULL &&
2718 call->as_CallStaticJava()->method()->is_method_handle_intrinsic() &&
2719 call->proj_out(TypeFunc::Parms) != NULL &&
2720 call->proj_out(TypeFunc::Parms)->bottom_type()->isa_valuetypeptr()) {
2721 // A value type is returned from the call but we don't know its
2722 // type. One of the values being returned is the klass of the
2723 // value type. We need to allocate a value type instance of that
2724 // type and initialize it with other values being returned. This
2725 // is done with the stub call below that we add right after this
2726 // call.
2727 Node* ret = call->proj_out(TypeFunc::Parms);
2728 assert(ret->bottom_type()->is_valuetypeptr()->klass() == env()->___Value_klass(), "unexpected return type from MH intrinsic");
2729 const TypeFunc* tf = call->_tf;
2730 const TypeTuple* domain = OptoRuntime::store_value_type_fields_Type()->domain_cc();
2731 const TypeFunc* new_tf = TypeFunc::make(tf->domain_sig(), tf->domain_cc(), tf->range_sig(), domain);
2732 call->_tf = new_tf;
2733
2734 CallProjections projs;
2735 call->extract_projections(&projs, true, true);
2736 Node* ctl = projs.fallthrough_catchproj;
2737 Node* mem = projs.fallthrough_memproj;
2738 Node* io = projs.fallthrough_ioproj;
2739 Node* ex_ctl = projs.catchall_catchproj;
2740 Node* ex_mem = projs.catchall_memproj;
2741 Node* ex_io = projs.catchall_ioproj;
2742 CallStaticJavaNode* rt_call = new CallStaticJavaNode(OptoRuntime::store_value_type_fields_Type(),
2743 StubRoutines::store_value_type_fields_to_buf(),
2744 "store_value_type_fields",
2745 call->jvms()->bci(),
2746 TypePtr::BOTTOM);
2747 Node* out_ctl = new ProjNode(rt_call, TypeFunc::Control);
2748 Node* out_mem = new ProjNode(rt_call, TypeFunc::Memory);
2749 Node* out_io = new ProjNode(rt_call, TypeFunc::I_O);
2750 Node* res = new ProjNode(rt_call, TypeFunc::Parms);
2751
2752 Node* catc = new CatchNode(out_ctl, out_io, 2);
2753 Node* norm = new CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci);
2754 Node* excp = new CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci);
2755 Node* r = new RegionNode(3);
2756 Node* mem_phi = new PhiNode(r, Type::MEMORY, TypePtr::BOTTOM);
2757 Node* io_phi = new PhiNode(r, Type::ABIO);
2758 r->init_req(1, excp);
2759 mem_phi->init_req(1, out_mem);
2760 io_phi->init_req(1, out_io);
2761
2762 frc._visited.set(norm->_idx);
2763 frc._visited.set(excp->_idx);
2764
2765 ctl->replace_by(norm);
2766 mem->replace_by(out_mem);
2767 io->replace_by(out_io);
2768 ret->replace_by(res);
2769 ex_ctl->replace_by(r);
2770 ex_mem->replace_by(mem_phi);
2771 ex_io->replace_by(io_phi);
2772
2773 r->init_req(2, ex_ctl);
2774 mem_phi->init_req(2, ex_mem);
2775 io_phi->init_req(2, ex_io);
2776
2777 rt_call->init_req(TypeFunc::Control, ctl);
2778 rt_call->init_req(TypeFunc::Memory, mem);
2779 rt_call->init_req(TypeFunc::I_O, io);
2780 rt_call->init_req(TypeFunc::FramePtr, call->in(TypeFunc::FramePtr));
2781 rt_call->init_req(TypeFunc::ReturnAdr, call->in(TypeFunc::ReturnAdr));
2782
2783 rt_call->init_req(TypeFunc::Parms, ret);
2784 // We don't know how many values are returned. This assumes the
2785 // worst case, that all available registers are used.
2786 for (uint i = TypeFunc::Parms+1; i < domain->cnt(); i++) {
2787 if (domain->field_at(i) == Type::HALF) {
2788 rt_call->init_req(i, top());
2789 continue;
2790 }
2791 Node* proj = new ProjNode(call, i);
2792 rt_call->init_req(i, proj);
2793 }
2794
2795 // We can safepoint at that new call
2796 add_safepoint_edges(rt_call, call->jvms());
2797 }
2798 }
2799
2800 //------------------------------final_graph_reshaping_impl----------------------
2801 // Implement items 1-5 from final_graph_reshaping below.
2802 void Compile::final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc) {
2803
2804 if ( n->outcnt() == 0 ) return; // dead node
2805 uint nop = n->Opcode();
2806
2807 // Check for 2-input instruction with "last use" on right input.
2808 // Swap to left input. Implements item (2).
2809 if( n->req() == 3 && // two-input instruction
2810 n->in(1)->outcnt() > 1 && // left use is NOT a last use
2811 (!n->in(1)->is_Phi() || n->in(1)->in(2) != n) && // it is not data loop
2812 n->in(2)->outcnt() == 1 &&// right use IS a last use
2813 !n->in(2)->is_Con() ) { // right use is not a constant
2814 // Check for commutative opcode
2815 switch( nop ) {
2816 case Op_AddI: case Op_AddF: case Op_AddD: case Op_AddL:
2817 case Op_MaxI: case Op_MinI:
2818 case Op_MulI: case Op_MulF: case Op_MulD: case Op_MulL:
2819 case Op_AndL: case Op_XorL: case Op_OrL:
2820 case Op_AndI: case Op_XorI: case Op_OrI: {
2821 // Move "last use" input to left by swapping inputs
2822 n->swap_edges(1, 2);
2823 break;
2824 }
2825 default:
2826 break;
2827 }
2828 }
2829
2830 #ifdef ASSERT
2831 if( n->is_Mem() ) {
2832 int alias_idx = get_alias_index(n->as_Mem()->adr_type());
2833 assert( n->in(0) != NULL || alias_idx != Compile::AliasIdxRaw ||
2834 // oop will be recorded in oop map if load crosses safepoint
2835 n->is_Load() && (n->as_Load()->bottom_type()->isa_oopptr() ||
2836 LoadNode::is_immutable_value(n->in(MemNode::Address))),
2837 "raw memory operations should have control edge");
2838 }
2839 #endif
2840 // Count FPU ops and common calls, implements item (3)
2841 switch( nop ) {
2842 // Count all float operations that may use FPU
2843 case Op_AddF:
2844 case Op_SubF:
2845 case Op_MulF:
2846 case Op_DivF:
2847 case Op_NegF:
2848 case Op_ModF:
2849 case Op_ConvI2F:
2850 case Op_ConF:
2851 case Op_CmpF:
2852 case Op_CmpF3:
2853 // case Op_ConvL2F: // longs are split into 32-bit halves
2854 frc.inc_float_count();
2855 break;
2856
2857 case Op_ConvF2D:
2858 case Op_ConvD2F:
2859 frc.inc_float_count();
2860 frc.inc_double_count();
2861 break;
2862
2863 // Count all double operations that may use FPU
2864 case Op_AddD:
2865 case Op_SubD:
2866 case Op_MulD:
2867 case Op_DivD:
2868 case Op_NegD:
2869 case Op_ModD:
2870 case Op_ConvI2D:
2871 case Op_ConvD2I:
2872 // case Op_ConvL2D: // handled by leaf call
2873 // case Op_ConvD2L: // handled by leaf call
2874 case Op_ConD:
2875 case Op_CmpD:
2876 case Op_CmpD3:
2877 frc.inc_double_count();
2878 break;
2879 case Op_Opaque1: // Remove Opaque Nodes before matching
2880 case Op_Opaque2: // Remove Opaque Nodes before matching
2881 case Op_Opaque3:
2882 n->subsume_by(n->in(1), this);
2883 break;
2884 case Op_CallStaticJava:
2885 case Op_CallJava:
2886 case Op_CallDynamicJava:
2887 frc.inc_java_call_count(); // Count java call site;
2888 case Op_CallRuntime:
2889 case Op_CallLeaf:
2890 case Op_CallLeafNoFP: {
2891 assert( n->is_Call(), "" );
2892 CallNode *call = n->as_Call();
2893 // Count call sites where the FP mode bit would have to be flipped.
2894 // Do not count uncommon runtime calls:
2895 // uncommon_trap, _complete_monitor_locking, _complete_monitor_unlocking,
2896 // _new_Java, _new_typeArray, _new_objArray, _rethrow_Java, ...
2897 if( !call->is_CallStaticJava() || !call->as_CallStaticJava()->_name ) {
2898 frc.inc_call_count(); // Count the call site
2899 } else { // See if uncommon argument is shared
2900 Node *n = call->in(TypeFunc::Parms);
2901 int nop = n->Opcode();
2902 // Clone shared simple arguments to uncommon calls, item (1).
2903 if( n->outcnt() > 1 &&
2904 !n->is_Proj() &&
2905 nop != Op_CreateEx &&
2906 nop != Op_CheckCastPP &&
2907 nop != Op_DecodeN &&
2908 nop != Op_DecodeNKlass &&
2909 !n->is_Mem() ) {
2910 Node *x = n->clone();
2911 call->set_req( TypeFunc::Parms, x );
2912 }
2913 }
2914 value_type_return_from_mh_intrinsic(call, frc);
2915 break;
2916 }
2917
2918 case Op_StoreD:
2919 case Op_LoadD:
2920 case Op_LoadD_unaligned:
2921 frc.inc_double_count();
2922 goto handle_mem;
2923 case Op_StoreF:
2924 case Op_LoadF:
2925 frc.inc_float_count();
2926 goto handle_mem;
2927
2928 case Op_StoreCM:
2929 {
2930 // Convert OopStore dependence into precedence edge
2931 Node* prec = n->in(MemNode::OopStore);
2932 n->del_req(MemNode::OopStore);
2933 n->add_prec(prec);
2934 eliminate_redundant_card_marks(n);
2935 }
2936
2937 // fall through
2938
2939 case Op_StoreB:
2940 case Op_StoreC:
2941 case Op_StorePConditional:
2942 case Op_StoreI:
2943 case Op_StoreL:
2944 case Op_StoreIConditional:
2945 case Op_StoreLConditional:
2946 case Op_CompareAndSwapB:
2947 case Op_CompareAndSwapS:
2948 case Op_CompareAndSwapI:
2949 case Op_CompareAndSwapL:
2950 case Op_CompareAndSwapP:
2951 case Op_CompareAndSwapN:
2952 case Op_WeakCompareAndSwapB:
2953 case Op_WeakCompareAndSwapS:
2954 case Op_WeakCompareAndSwapI:
2955 case Op_WeakCompareAndSwapL:
2956 case Op_WeakCompareAndSwapP:
2957 case Op_WeakCompareAndSwapN:
2958 case Op_CompareAndExchangeB:
2959 case Op_CompareAndExchangeS:
2960 case Op_CompareAndExchangeI:
2961 case Op_CompareAndExchangeL:
2962 case Op_CompareAndExchangeP:
2963 case Op_CompareAndExchangeN:
2964 case Op_GetAndAddS:
2965 case Op_GetAndAddB:
2966 case Op_GetAndAddI:
2967 case Op_GetAndAddL:
2968 case Op_GetAndSetS:
2969 case Op_GetAndSetB:
2970 case Op_GetAndSetI:
2971 case Op_GetAndSetL:
2972 case Op_GetAndSetP:
2973 case Op_GetAndSetN:
2974 case Op_StoreP:
2975 case Op_StoreN:
2976 case Op_StoreNKlass:
2977 case Op_LoadB:
2978 case Op_LoadUB:
2979 case Op_LoadUS:
2980 case Op_LoadI:
2981 case Op_LoadKlass:
2982 case Op_LoadNKlass:
2983 case Op_LoadL:
2984 case Op_LoadL_unaligned:
2985 case Op_LoadPLocked:
2986 case Op_LoadP:
2987 case Op_LoadN:
2988 case Op_LoadRange:
2989 case Op_LoadS: {
2990 handle_mem:
2991 #ifdef ASSERT
2992 if( VerifyOptoOopOffsets ) {
2993 assert( n->is_Mem(), "" );
2994 MemNode *mem = (MemNode*)n;
2995 // Check to see if address types have grounded out somehow.
2996 const TypeInstPtr *tp = mem->in(MemNode::Address)->bottom_type()->isa_instptr();
2997 assert( !tp || oop_offset_is_sane(tp), "" );
2998 }
2999 #endif
3000 break;
3001 }
3002
3003 case Op_AddP: { // Assert sane base pointers
3004 Node *addp = n->in(AddPNode::Address);
3005 assert( !addp->is_AddP() ||
3006 addp->in(AddPNode::Base)->is_top() || // Top OK for allocation
3007 addp->in(AddPNode::Base) == n->in(AddPNode::Base),
3008 "Base pointers must match (addp %u)", addp->_idx );
3009 #ifdef _LP64
3010 if ((UseCompressedOops || UseCompressedClassPointers) &&
3011 addp->Opcode() == Op_ConP &&
3012 addp == n->in(AddPNode::Base) &&
3013 n->in(AddPNode::Offset)->is_Con()) {
3014 // If the transformation of ConP to ConN+DecodeN is beneficial depends
3015 // on the platform and on the compressed oops mode.
3016 // Use addressing with narrow klass to load with offset on x86.
3017 // Some platforms can use the constant pool to load ConP.
3018 // Do this transformation here since IGVN will convert ConN back to ConP.
3019 const Type* t = addp->bottom_type();
3020 bool is_oop = t->isa_oopptr() != NULL;
3021 bool is_klass = t->isa_klassptr() != NULL;
3022
3023 if ((is_oop && Matcher::const_oop_prefer_decode() ) ||
3024 (is_klass && Matcher::const_klass_prefer_decode())) {
3025 Node* nn = NULL;
3026
3027 int op = is_oop ? Op_ConN : Op_ConNKlass;
3028
3029 // Look for existing ConN node of the same exact type.
3030 Node* r = root();
3031 uint cnt = r->outcnt();
3032 for (uint i = 0; i < cnt; i++) {
3033 Node* m = r->raw_out(i);
3034 if (m!= NULL && m->Opcode() == op &&
3035 m->bottom_type()->make_ptr() == t) {
3036 nn = m;
3037 break;
3038 }
3039 }
3040 if (nn != NULL) {
3041 // Decode a narrow oop to match address
3042 // [R12 + narrow_oop_reg<<3 + offset]
3043 if (is_oop) {
3044 nn = new DecodeNNode(nn, t);
3045 } else {
3046 nn = new DecodeNKlassNode(nn, t);
3047 }
3048 // Check for succeeding AddP which uses the same Base.
3049 // Otherwise we will run into the assertion above when visiting that guy.
3050 for (uint i = 0; i < n->outcnt(); ++i) {
3051 Node *out_i = n->raw_out(i);
3052 if (out_i && out_i->is_AddP() && out_i->in(AddPNode::Base) == addp) {
3053 out_i->set_req(AddPNode::Base, nn);
3054 #ifdef ASSERT
3055 for (uint j = 0; j < out_i->outcnt(); ++j) {
3056 Node *out_j = out_i->raw_out(j);
3057 assert(out_j == NULL || !out_j->is_AddP() || out_j->in(AddPNode::Base) != addp,
3058 "more than 2 AddP nodes in a chain (out_j %u)", out_j->_idx);
3059 }
3060 #endif
3061 }
3062 }
3063 n->set_req(AddPNode::Base, nn);
3064 n->set_req(AddPNode::Address, nn);
3065 if (addp->outcnt() == 0) {
3066 addp->disconnect_inputs(NULL, this);
3067 }
3068 }
3069 }
3070 }
3071 #endif
3072 // platform dependent reshaping of the address expression
3073 reshape_address(n->as_AddP());
3074 break;
3075 }
3076
3077 case Op_CastPP: {
3078 // Remove CastPP nodes to gain more freedom during scheduling but
3079 // keep the dependency they encode as control or precedence edges
3080 // (if control is set already) on memory operations. Some CastPP
3081 // nodes don't have a control (don't carry a dependency): skip
3082 // those.
3083 if (n->in(0) != NULL) {
3084 ResourceMark rm;
3085 Unique_Node_List wq;
3086 wq.push(n);
3087 for (uint next = 0; next < wq.size(); ++next) {
3088 Node *m = wq.at(next);
3089 for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax; i++) {
3090 Node* use = m->fast_out(i);
3091 if (use->is_Mem() || use->is_EncodeNarrowPtr()) {
3092 use->ensure_control_or_add_prec(n->in(0));
3093 } else {
3094 switch(use->Opcode()) {
3095 case Op_AddP:
3096 case Op_DecodeN:
3097 case Op_DecodeNKlass:
3098 case Op_CheckCastPP:
3099 case Op_CastPP:
3100 wq.push(use);
3101 break;
3102 }
3103 }
3104 }
3105 }
3106 }
3107 const bool is_LP64 = LP64_ONLY(true) NOT_LP64(false);
3108 if (is_LP64 && n->in(1)->is_DecodeN() && Matcher::gen_narrow_oop_implicit_null_checks()) {
3109 Node* in1 = n->in(1);
3110 const Type* t = n->bottom_type();
3111 Node* new_in1 = in1->clone();
3112 new_in1->as_DecodeN()->set_type(t);
3113
3114 if (!Matcher::narrow_oop_use_complex_address()) {
3115 //
3116 // x86, ARM and friends can handle 2 adds in addressing mode
3117 // and Matcher can fold a DecodeN node into address by using
3118 // a narrow oop directly and do implicit NULL check in address:
3119 //
3120 // [R12 + narrow_oop_reg<<3 + offset]
3121 // NullCheck narrow_oop_reg
3122 //
3123 // On other platforms (Sparc) we have to keep new DecodeN node and
3124 // use it to do implicit NULL check in address:
3125 //
3126 // decode_not_null narrow_oop_reg, base_reg
3127 // [base_reg + offset]
3128 // NullCheck base_reg
3129 //
3130 // Pin the new DecodeN node to non-null path on these platform (Sparc)
3131 // to keep the information to which NULL check the new DecodeN node
3132 // corresponds to use it as value in implicit_null_check().
3133 //
3134 new_in1->set_req(0, n->in(0));
3135 }
3136
3137 n->subsume_by(new_in1, this);
3138 if (in1->outcnt() == 0) {
3139 in1->disconnect_inputs(NULL, this);
3140 }
3141 } else {
3142 n->subsume_by(n->in(1), this);
3143 if (n->outcnt() == 0) {
3144 n->disconnect_inputs(NULL, this);
3145 }
3146 }
3147 break;
3148 }
3149 #ifdef _LP64
3150 case Op_CmpP:
3151 // Do this transformation here to preserve CmpPNode::sub() and
3152 // other TypePtr related Ideal optimizations (for example, ptr nullness).
3153 if (n->in(1)->is_DecodeNarrowPtr() || n->in(2)->is_DecodeNarrowPtr()) {
3154 Node* in1 = n->in(1);
3155 Node* in2 = n->in(2);
3156 if (!in1->is_DecodeNarrowPtr()) {
3157 in2 = in1;
3158 in1 = n->in(2);
3159 }
3160 assert(in1->is_DecodeNarrowPtr(), "sanity");
3161
3162 Node* new_in2 = NULL;
3163 if (in2->is_DecodeNarrowPtr()) {
3164 assert(in2->Opcode() == in1->Opcode(), "must be same node type");
3165 new_in2 = in2->in(1);
3166 } else if (in2->Opcode() == Op_ConP) {
3167 const Type* t = in2->bottom_type();
3168 if (t == TypePtr::NULL_PTR) {
3169 assert(in1->is_DecodeN(), "compare klass to null?");
3170 // Don't convert CmpP null check into CmpN if compressed
3171 // oops implicit null check is not generated.
3172 // This will allow to generate normal oop implicit null check.
3173 if (Matcher::gen_narrow_oop_implicit_null_checks())
3174 new_in2 = ConNode::make(TypeNarrowOop::NULL_PTR);
3175 //
3176 // This transformation together with CastPP transformation above
3177 // will generated code for implicit NULL checks for compressed oops.
3178 //
3179 // The original code after Optimize()
3180 //
3181 // LoadN memory, narrow_oop_reg
3182 // decode narrow_oop_reg, base_reg
3183 // CmpP base_reg, NULL
3184 // CastPP base_reg // NotNull
3185 // Load [base_reg + offset], val_reg
3186 //
3187 // after these transformations will be
3188 //
3189 // LoadN memory, narrow_oop_reg
3190 // CmpN narrow_oop_reg, NULL
3191 // decode_not_null narrow_oop_reg, base_reg
3192 // Load [base_reg + offset], val_reg
3193 //
3194 // and the uncommon path (== NULL) will use narrow_oop_reg directly
3195 // since narrow oops can be used in debug info now (see the code in
3196 // final_graph_reshaping_walk()).
3197 //
3198 // At the end the code will be matched to
3199 // on x86:
3200 //
3201 // Load_narrow_oop memory, narrow_oop_reg
3202 // Load [R12 + narrow_oop_reg<<3 + offset], val_reg
3203 // NullCheck narrow_oop_reg
3204 //
3205 // and on sparc:
3206 //
3207 // Load_narrow_oop memory, narrow_oop_reg
3208 // decode_not_null narrow_oop_reg, base_reg
3209 // Load [base_reg + offset], val_reg
3210 // NullCheck base_reg
3211 //
3212 } else if (t->isa_oopptr()) {
3213 new_in2 = ConNode::make(t->make_narrowoop());
3214 } else if (t->isa_klassptr()) {
3215 new_in2 = ConNode::make(t->make_narrowklass());
3216 }
3217 }
3218 if (new_in2 != NULL) {
3219 Node* cmpN = new CmpNNode(in1->in(1), new_in2);
3220 n->subsume_by(cmpN, this);
3221 if (in1->outcnt() == 0) {
3222 in1->disconnect_inputs(NULL, this);
3223 }
3224 if (in2->outcnt() == 0) {
3225 in2->disconnect_inputs(NULL, this);
3226 }
3227 }
3228 }
3229 break;
3230
3231 case Op_DecodeN:
3232 case Op_DecodeNKlass:
3233 assert(!n->in(1)->is_EncodeNarrowPtr(), "should be optimized out");
3234 // DecodeN could be pinned when it can't be fold into
3235 // an address expression, see the code for Op_CastPP above.
3236 assert(n->in(0) == NULL || (UseCompressedOops && !Matcher::narrow_oop_use_complex_address()), "no control");
3237 break;
3238
3239 case Op_EncodeP:
3240 case Op_EncodePKlass: {
3241 Node* in1 = n->in(1);
3242 if (in1->is_DecodeNarrowPtr()) {
3243 n->subsume_by(in1->in(1), this);
3244 } else if (in1->Opcode() == Op_ConP) {
3245 const Type* t = in1->bottom_type();
3246 if (t == TypePtr::NULL_PTR) {
3247 assert(t->isa_oopptr(), "null klass?");
3248 n->subsume_by(ConNode::make(TypeNarrowOop::NULL_PTR), this);
3249 } else if (t->isa_oopptr()) {
3250 n->subsume_by(ConNode::make(t->make_narrowoop()), this);
3251 } else if (t->isa_klassptr()) {
3252 n->subsume_by(ConNode::make(t->make_narrowklass()), this);
3253 }
3254 }
3255 if (in1->outcnt() == 0) {
3256 in1->disconnect_inputs(NULL, this);
3257 }
3258 break;
3259 }
3260
3261 case Op_Proj: {
3262 if (OptimizeStringConcat) {
3263 ProjNode* p = n->as_Proj();
3264 if (p->_is_io_use) {
3265 // Separate projections were used for the exception path which
3266 // are normally removed by a late inline. If it wasn't inlined
3267 // then they will hang around and should just be replaced with
3268 // the original one.
3269 Node* proj = NULL;
3270 // Replace with just one
3271 for (SimpleDUIterator i(p->in(0)); i.has_next(); i.next()) {
3272 Node *use = i.get();
3273 if (use->is_Proj() && p != use && use->as_Proj()->_con == p->_con) {
3274 proj = use;
3275 break;
3276 }
3277 }
3278 assert(proj != NULL, "must be found");
3279 p->subsume_by(proj, this);
3280 }
3281 }
3282 break;
3283 }
3284
3285 case Op_Phi:
3286 if (n->as_Phi()->bottom_type()->isa_narrowoop() || n->as_Phi()->bottom_type()->isa_narrowklass()) {
3287 // The EncodeP optimization may create Phi with the same edges
3288 // for all paths. It is not handled well by Register Allocator.
3289 Node* unique_in = n->in(1);
3290 assert(unique_in != NULL, "");
3291 uint cnt = n->req();
3292 for (uint i = 2; i < cnt; i++) {
3293 Node* m = n->in(i);
3294 assert(m != NULL, "");
3295 if (unique_in != m)
3296 unique_in = NULL;
3297 }
3298 if (unique_in != NULL) {
3299 n->subsume_by(unique_in, this);
3300 }
3301 }
3302 break;
3303
3304 #endif
3305
3306 #ifdef ASSERT
3307 case Op_CastII:
3308 // Verify that all range check dependent CastII nodes were removed.
3309 if (n->isa_CastII()->has_range_check()) {
3310 n->dump(3);
3311 assert(false, "Range check dependent CastII node was not removed");
3312 }
3313 break;
3314 #endif
3315
3316 case Op_ModI:
3317 if (UseDivMod) {
3318 // Check if a%b and a/b both exist
3319 Node* d = n->find_similar(Op_DivI);
3320 if (d) {
3321 // Replace them with a fused divmod if supported
3322 if (Matcher::has_match_rule(Op_DivModI)) {
3323 DivModINode* divmod = DivModINode::make(n);
3324 d->subsume_by(divmod->div_proj(), this);
3325 n->subsume_by(divmod->mod_proj(), this);
3326 } else {
3327 // replace a%b with a-((a/b)*b)
3328 Node* mult = new MulINode(d, d->in(2));
3329 Node* sub = new SubINode(d->in(1), mult);
3330 n->subsume_by(sub, this);
3331 }
3332 }
3333 }
3334 break;
3335
3336 case Op_ModL:
3337 if (UseDivMod) {
3338 // Check if a%b and a/b both exist
3339 Node* d = n->find_similar(Op_DivL);
3340 if (d) {
3341 // Replace them with a fused divmod if supported
3342 if (Matcher::has_match_rule(Op_DivModL)) {
3343 DivModLNode* divmod = DivModLNode::make(n);
3344 d->subsume_by(divmod->div_proj(), this);
3345 n->subsume_by(divmod->mod_proj(), this);
3346 } else {
3347 // replace a%b with a-((a/b)*b)
3348 Node* mult = new MulLNode(d, d->in(2));
3349 Node* sub = new SubLNode(d->in(1), mult);
3350 n->subsume_by(sub, this);
3351 }
3352 }
3353 }
3354 break;
3355
3356 case Op_LoadVector:
3357 case Op_StoreVector:
3358 break;
3359
3360 case Op_AddReductionVI:
3361 case Op_AddReductionVL:
3362 case Op_AddReductionVF:
3363 case Op_AddReductionVD:
3364 case Op_MulReductionVI:
3365 case Op_MulReductionVL:
3366 case Op_MulReductionVF:
3367 case Op_MulReductionVD:
3368 break;
3369
3370 case Op_PackB:
3371 case Op_PackS:
3372 case Op_PackI:
3373 case Op_PackF:
3374 case Op_PackL:
3375 case Op_PackD:
3376 if (n->req()-1 > 2) {
3377 // Replace many operand PackNodes with a binary tree for matching
3378 PackNode* p = (PackNode*) n;
3379 Node* btp = p->binary_tree_pack(1, n->req());
3380 n->subsume_by(btp, this);
3381 }
3382 break;
3383 case Op_Loop:
3384 case Op_CountedLoop:
3385 if (n->as_Loop()->is_inner_loop()) {
3386 frc.inc_inner_loop_count();
3387 }
3388 break;
3389 case Op_LShiftI:
3390 case Op_RShiftI:
3391 case Op_URShiftI:
3392 case Op_LShiftL:
3393 case Op_RShiftL:
3394 case Op_URShiftL:
3395 if (Matcher::need_masked_shift_count) {
3396 // The cpu's shift instructions don't restrict the count to the
3397 // lower 5/6 bits. We need to do the masking ourselves.
3398 Node* in2 = n->in(2);
3399 juint mask = (n->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1);
3400 const TypeInt* t = in2->find_int_type();
3401 if (t != NULL && t->is_con()) {
3402 juint shift = t->get_con();
3403 if (shift > mask) { // Unsigned cmp
3404 n->set_req(2, ConNode::make(TypeInt::make(shift & mask)));
3405 }
3406 } else {
3407 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) {
3408 Node* shift = new AndINode(in2, ConNode::make(TypeInt::make(mask)));
3409 n->set_req(2, shift);
3410 }
3411 }
3412 if (in2->outcnt() == 0) { // Remove dead node
3413 in2->disconnect_inputs(NULL, this);
3414 }
3415 }
3416 break;
3417 case Op_MemBarStoreStore:
3418 case Op_MemBarRelease:
3419 // Break the link with AllocateNode: it is no longer useful and
3420 // confuses register allocation.
3421 if (n->req() > MemBarNode::Precedent) {
3422 n->set_req(MemBarNode::Precedent, top());
3423 }
3424 break;
3425 case Op_RangeCheck: {
3426 RangeCheckNode* rc = n->as_RangeCheck();
3427 Node* iff = new IfNode(rc->in(0), rc->in(1), rc->_prob, rc->_fcnt);
3428 n->subsume_by(iff, this);
3429 frc._tests.push(iff);
3430 break;
3431 }
3432 case Op_ConvI2L: {
3433 if (!Matcher::convi2l_type_required) {
3434 // Code generation on some platforms doesn't need accurate
3435 // ConvI2L types. Widening the type can help remove redundant
3436 // address computations.
3437 n->as_Type()->set_type(TypeLong::INT);
3438 ResourceMark rm;
3439 Node_List wq;
3440 wq.push(n);
3441 for (uint next = 0; next < wq.size(); next++) {
3442 Node *m = wq.at(next);
3443
3444 for(;;) {
3445 // Loop over all nodes with identical inputs edges as m
3446 Node* k = m->find_similar(m->Opcode());
3447 if (k == NULL) {
3448 break;
3449 }
3450 // Push their uses so we get a chance to remove node made
3451 // redundant
3452 for (DUIterator_Fast imax, i = k->fast_outs(imax); i < imax; i++) {
3453 Node* u = k->fast_out(i);
3454 assert(!wq.contains(u), "shouldn't process one node several times");
3455 if (u->Opcode() == Op_LShiftL ||
3456 u->Opcode() == Op_AddL ||
3457 u->Opcode() == Op_SubL ||
3458 u->Opcode() == Op_AddP) {
3459 wq.push(u);
3460 }
3461 }
3462 // Replace all nodes with identical edges as m with m
3463 k->subsume_by(m, this);
3464 }
3465 }
3466 }
3467 break;
3468 }
3469 case Op_ValueType: {
3470 ValueTypeNode* vt = n->as_ValueType();
3471 vt->make_scalar_in_safepoints(root(), NULL);
3472 if (vt->outcnt() == 0) {
3473 vt->disconnect_inputs(NULL, this);
3474 }
3475 break;
3476 }
3477 case Op_ValueTypePtr: {
3478 ShouldNotReachHere();
3479 break;
3480 }
3481 default:
3482 assert( !n->is_Call(), "" );
3483 assert( !n->is_Mem(), "" );
3484 assert( nop != Op_ProfileBoolean, "should be eliminated during IGVN");
3485 break;
3486 }
3487
3488 // Collect CFG split points
3489 if (n->is_MultiBranch() && !n->is_RangeCheck()) {
3490 frc._tests.push(n);
3491 }
3492 }
3493
3494 //------------------------------final_graph_reshaping_walk---------------------
3495 // Replacing Opaque nodes with their input in final_graph_reshaping_impl(),
3496 // requires that the walk visits a node's inputs before visiting the node.
3497 void Compile::final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Reshape_Counts &frc ) {
3498 ResourceArea *area = Thread::current()->resource_area();
3499 Unique_Node_List sfpt(area);
3500
3501 frc._visited.set(root->_idx); // first, mark node as visited
3502 uint cnt = root->req();
3503 Node *n = root;
3504 uint i = 0;
3505 while (true) {
3506 if (i < cnt) {
3507 // Place all non-visited non-null inputs onto stack
3508 Node* m = n->in(i);
3509 ++i;
3510 if (m != NULL && !frc._visited.test_set(m->_idx)) {
3511 if (m->is_SafePoint() && m->as_SafePoint()->jvms() != NULL) {
3512 // compute worst case interpreter size in case of a deoptimization
3513 update_interpreter_frame_size(m->as_SafePoint()->jvms()->interpreter_frame_size());
3514
3515 sfpt.push(m);
3516 }
3517 cnt = m->req();
3518 nstack.push(n, i); // put on stack parent and next input's index
3519 n = m;
3520 i = 0;
3521 }
3522 } else {
3523 // Now do post-visit work
3524 final_graph_reshaping_impl( n, frc );
3525 if (nstack.is_empty())
3526 break; // finished
3527 n = nstack.node(); // Get node from stack
3528 cnt = n->req();
3529 i = nstack.index();
3530 nstack.pop(); // Shift to the next node on stack
3531 }
3532 }
3533
3534 // Skip next transformation if compressed oops are not used.
3535 if ((UseCompressedOops && !Matcher::gen_narrow_oop_implicit_null_checks()) ||
3536 (!UseCompressedOops && !UseCompressedClassPointers))
3537 return;
3538
3539 // Go over safepoints nodes to skip DecodeN/DecodeNKlass nodes for debug edges.
3540 // It could be done for an uncommon traps or any safepoints/calls
3541 // if the DecodeN/DecodeNKlass node is referenced only in a debug info.
3542 while (sfpt.size() > 0) {
3543 n = sfpt.pop();
3544 JVMState *jvms = n->as_SafePoint()->jvms();
3545 assert(jvms != NULL, "sanity");
3546 int start = jvms->debug_start();
3547 int end = n->req();
3548 bool is_uncommon = (n->is_CallStaticJava() &&
3549 n->as_CallStaticJava()->uncommon_trap_request() != 0);
3550 for (int j = start; j < end; j++) {
3551 Node* in = n->in(j);
3552 if (in->is_DecodeNarrowPtr()) {
3553 bool safe_to_skip = true;
3554 if (!is_uncommon ) {
3555 // Is it safe to skip?
3556 for (uint i = 0; i < in->outcnt(); i++) {
3557 Node* u = in->raw_out(i);
3558 if (!u->is_SafePoint() ||
3559 u->is_Call() && u->as_Call()->has_non_debug_use(n)) {
3560 safe_to_skip = false;
3561 }
3562 }
3563 }
3564 if (safe_to_skip) {
3565 n->set_req(j, in->in(1));
3566 }
3567 if (in->outcnt() == 0) {
3568 in->disconnect_inputs(NULL, this);
3569 }
3570 }
3571 }
3572 }
3573 }
3574
3575 //------------------------------final_graph_reshaping--------------------------
3576 // Final Graph Reshaping.
3577 //
3578 // (1) Clone simple inputs to uncommon calls, so they can be scheduled late
3579 // and not commoned up and forced early. Must come after regular
3580 // optimizations to avoid GVN undoing the cloning. Clone constant
3581 // inputs to Loop Phis; these will be split by the allocator anyways.
3582 // Remove Opaque nodes.
3583 // (2) Move last-uses by commutative operations to the left input to encourage
3584 // Intel update-in-place two-address operations and better register usage
3585 // on RISCs. Must come after regular optimizations to avoid GVN Ideal
3586 // calls canonicalizing them back.
3587 // (3) Count the number of double-precision FP ops, single-precision FP ops
3588 // and call sites. On Intel, we can get correct rounding either by
3589 // forcing singles to memory (requires extra stores and loads after each
3590 // FP bytecode) or we can set a rounding mode bit (requires setting and
3591 // clearing the mode bit around call sites). The mode bit is only used
3592 // if the relative frequency of single FP ops to calls is low enough.
3593 // This is a key transform for SPEC mpeg_audio.
3594 // (4) Detect infinite loops; blobs of code reachable from above but not
3595 // below. Several of the Code_Gen algorithms fail on such code shapes,
3596 // so we simply bail out. Happens a lot in ZKM.jar, but also happens
3597 // from time to time in other codes (such as -Xcomp finalizer loops, etc).
3598 // Detection is by looking for IfNodes where only 1 projection is
3599 // reachable from below or CatchNodes missing some targets.
3600 // (5) Assert for insane oop offsets in debug mode.
3601
3602 bool Compile::final_graph_reshaping() {
3603 // an infinite loop may have been eliminated by the optimizer,
3604 // in which case the graph will be empty.
3605 if (root()->req() == 1) {
3606 record_method_not_compilable("trivial infinite loop");
3607 return true;
3608 }
3609
3610 // Expensive nodes have their control input set to prevent the GVN
3611 // from freely commoning them. There's no GVN beyond this point so
3612 // no need to keep the control input. We want the expensive nodes to
3613 // be freely moved to the least frequent code path by gcm.
3614 assert(OptimizeExpensiveOps || expensive_count() == 0, "optimization off but list non empty?");
3615 for (int i = 0; i < expensive_count(); i++) {
3616 _expensive_nodes->at(i)->set_req(0, NULL);
3617 }
3618
3619 Final_Reshape_Counts frc;
3620
3621 // Visit everybody reachable!
3622 // Allocate stack of size C->live_nodes()/2 to avoid frequent realloc
3623 Node_Stack nstack(live_nodes() >> 1);
3624 final_graph_reshaping_walk(nstack, root(), frc);
3625
3626 // Check for unreachable (from below) code (i.e., infinite loops).
3627 for( uint i = 0; i < frc._tests.size(); i++ ) {
3628 MultiBranchNode *n = frc._tests[i]->as_MultiBranch();
3629 // Get number of CFG targets.
3630 // Note that PCTables include exception targets after calls.
3631 uint required_outcnt = n->required_outcnt();
3632 if (n->outcnt() != required_outcnt) {
3633 // Check for a few special cases. Rethrow Nodes never take the
3634 // 'fall-thru' path, so expected kids is 1 less.
3635 if (n->is_PCTable() && n->in(0) && n->in(0)->in(0)) {
3636 if (n->in(0)->in(0)->is_Call()) {
3637 CallNode *call = n->in(0)->in(0)->as_Call();
3638 if (call->entry_point() == OptoRuntime::rethrow_stub()) {
3639 required_outcnt--; // Rethrow always has 1 less kid
3640 } else if (call->req() > TypeFunc::Parms &&
3641 call->is_CallDynamicJava()) {
3642 // Check for null receiver. In such case, the optimizer has
3643 // detected that the virtual call will always result in a null
3644 // pointer exception. The fall-through projection of this CatchNode
3645 // will not be populated.
3646 Node *arg0 = call->in(TypeFunc::Parms);
3647 if (arg0->is_Type() &&
3648 arg0->as_Type()->type()->higher_equal(TypePtr::NULL_PTR)) {
3649 required_outcnt--;
3650 }
3651 } else if (call->entry_point() == OptoRuntime::new_array_Java() &&
3652 call->req() > TypeFunc::Parms+1 &&
3653 call->is_CallStaticJava()) {
3654 // Check for negative array length. In such case, the optimizer has
3655 // detected that the allocation attempt will always result in an
3656 // exception. There is no fall-through projection of this CatchNode .
3657 Node *arg1 = call->in(TypeFunc::Parms+1);
3658 if (arg1->is_Type() &&
3659 arg1->as_Type()->type()->join(TypeInt::POS)->empty()) {
3660 required_outcnt--;
3661 }
3662 }
3663 }
3664 }
3665 // Recheck with a better notion of 'required_outcnt'
3666 if (n->outcnt() != required_outcnt) {
3667 record_method_not_compilable("malformed control flow");
3668 return true; // Not all targets reachable!
3669 }
3670 }
3671 // Check that I actually visited all kids. Unreached kids
3672 // must be infinite loops.
3673 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++)
3674 if (!frc._visited.test(n->fast_out(j)->_idx)) {
3675 record_method_not_compilable("infinite loop");
3676 return true; // Found unvisited kid; must be unreach
3677 }
3678 }
3679
3680 // If original bytecodes contained a mixture of floats and doubles
3681 // check if the optimizer has made it homogenous, item (3).
3682 if( Use24BitFPMode && Use24BitFP && UseSSE == 0 &&
3683 frc.get_float_count() > 32 &&
3684 frc.get_double_count() == 0 &&
3685 (10 * frc.get_call_count() < frc.get_float_count()) ) {
3686 set_24_bit_selection_and_mode( false, true );
3687 }
3688
3689 set_java_calls(frc.get_java_call_count());
3690 set_inner_loops(frc.get_inner_loop_count());
3691
3692 // No infinite loops, no reason to bail out.
3693 return false;
3694 }
3695
3696 //-----------------------------too_many_traps----------------------------------
3697 // Report if there are too many traps at the current method and bci.
3698 // Return true if there was a trap, and/or PerMethodTrapLimit is exceeded.
3699 bool Compile::too_many_traps(ciMethod* method,
3700 int bci,
3701 Deoptimization::DeoptReason reason) {
3702 ciMethodData* md = method->method_data();
3703 if (md->is_empty()) {
3704 // Assume the trap has not occurred, or that it occurred only
3705 // because of a transient condition during start-up in the interpreter.
3706 return false;
3707 }
3708 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? this->method() : NULL;
3709 if (md->has_trap_at(bci, m, reason) != 0) {
3710 // Assume PerBytecodeTrapLimit==0, for a more conservative heuristic.
3711 // Also, if there are multiple reasons, or if there is no per-BCI record,
3712 // assume the worst.
3713 if (log())
3714 log()->elem("observe trap='%s' count='%d'",
3715 Deoptimization::trap_reason_name(reason),
3716 md->trap_count(reason));
3717 return true;
3718 } else {
3719 // Ignore method/bci and see if there have been too many globally.
3720 return too_many_traps(reason, md);
3721 }
3722 }
3723
3724 // Less-accurate variant which does not require a method and bci.
3725 bool Compile::too_many_traps(Deoptimization::DeoptReason reason,
3726 ciMethodData* logmd) {
3727 if (trap_count(reason) >= Deoptimization::per_method_trap_limit(reason)) {
3728 // Too many traps globally.
3729 // Note that we use cumulative trap_count, not just md->trap_count.
3730 if (log()) {
3731 int mcount = (logmd == NULL)? -1: (int)logmd->trap_count(reason);
3732 log()->elem("observe trap='%s' count='0' mcount='%d' ccount='%d'",
3733 Deoptimization::trap_reason_name(reason),
3734 mcount, trap_count(reason));
3735 }
3736 return true;
3737 } else {
3738 // The coast is clear.
3739 return false;
3740 }
3741 }
3742
3743 //--------------------------too_many_recompiles--------------------------------
3744 // Report if there are too many recompiles at the current method and bci.
3745 // Consults PerBytecodeRecompilationCutoff and PerMethodRecompilationCutoff.
3746 // Is not eager to return true, since this will cause the compiler to use
3747 // Action_none for a trap point, to avoid too many recompilations.
3748 bool Compile::too_many_recompiles(ciMethod* method,
3749 int bci,
3750 Deoptimization::DeoptReason reason) {
3751 ciMethodData* md = method->method_data();
3752 if (md->is_empty()) {
3753 // Assume the trap has not occurred, or that it occurred only
3754 // because of a transient condition during start-up in the interpreter.
3755 return false;
3756 }
3757 // Pick a cutoff point well within PerBytecodeRecompilationCutoff.
3758 uint bc_cutoff = (uint) PerBytecodeRecompilationCutoff / 8;
3759 uint m_cutoff = (uint) PerMethodRecompilationCutoff / 2 + 1; // not zero
3760 Deoptimization::DeoptReason per_bc_reason
3761 = Deoptimization::reason_recorded_per_bytecode_if_any(reason);
3762 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? this->method() : NULL;
3763 if ((per_bc_reason == Deoptimization::Reason_none
3764 || md->has_trap_at(bci, m, reason) != 0)
3765 // The trap frequency measure we care about is the recompile count:
3766 && md->trap_recompiled_at(bci, m)
3767 && md->overflow_recompile_count() >= bc_cutoff) {
3768 // Do not emit a trap here if it has already caused recompilations.
3769 // Also, if there are multiple reasons, or if there is no per-BCI record,
3770 // assume the worst.
3771 if (log())
3772 log()->elem("observe trap='%s recompiled' count='%d' recompiles2='%d'",
3773 Deoptimization::trap_reason_name(reason),
3774 md->trap_count(reason),
3775 md->overflow_recompile_count());
3776 return true;
3777 } else if (trap_count(reason) != 0
3778 && decompile_count() >= m_cutoff) {
3779 // Too many recompiles globally, and we have seen this sort of trap.
3780 // Use cumulative decompile_count, not just md->decompile_count.
3781 if (log())
3782 log()->elem("observe trap='%s' count='%d' mcount='%d' decompiles='%d' mdecompiles='%d'",
3783 Deoptimization::trap_reason_name(reason),
3784 md->trap_count(reason), trap_count(reason),
3785 md->decompile_count(), decompile_count());
3786 return true;
3787 } else {
3788 // The coast is clear.
3789 return false;
3790 }
3791 }
3792
3793 // Compute when not to trap. Used by matching trap based nodes and
3794 // NullCheck optimization.
3795 void Compile::set_allowed_deopt_reasons() {
3796 _allowed_reasons = 0;
3797 if (is_method_compilation()) {
3798 for (int rs = (int)Deoptimization::Reason_none+1; rs < Compile::trapHistLength; rs++) {
3799 assert(rs < BitsPerInt, "recode bit map");
3800 if (!too_many_traps((Deoptimization::DeoptReason) rs)) {
3801 _allowed_reasons |= nth_bit(rs);
3802 }
3803 }
3804 }
3805 }
3806
3807 #ifndef PRODUCT
3808 //------------------------------verify_graph_edges---------------------------
3809 // Walk the Graph and verify that there is a one-to-one correspondence
3810 // between Use-Def edges and Def-Use edges in the graph.
3811 void Compile::verify_graph_edges(bool no_dead_code) {
3812 if (VerifyGraphEdges) {
3813 ResourceArea *area = Thread::current()->resource_area();
3814 Unique_Node_List visited(area);
3815 // Call recursive graph walk to check edges
3816 _root->verify_edges(visited);
3817 if (no_dead_code) {
3818 // Now make sure that no visited node is used by an unvisited node.
3819 bool dead_nodes = false;
3820 Unique_Node_List checked(area);
3821 while (visited.size() > 0) {
3822 Node* n = visited.pop();
3823 checked.push(n);
3824 for (uint i = 0; i < n->outcnt(); i++) {
3825 Node* use = n->raw_out(i);
3826 if (checked.member(use)) continue; // already checked
3827 if (visited.member(use)) continue; // already in the graph
3828 if (use->is_Con()) continue; // a dead ConNode is OK
3829 // At this point, we have found a dead node which is DU-reachable.
3830 if (!dead_nodes) {
3831 tty->print_cr("*** Dead nodes reachable via DU edges:");
3832 dead_nodes = true;
3833 }
3834 use->dump(2);
3835 tty->print_cr("---");
3836 checked.push(use); // No repeats; pretend it is now checked.
3837 }
3838 }
3839 assert(!dead_nodes, "using nodes must be reachable from root");
3840 }
3841 }
3842 }
3843
3844 // Verify GC barriers consistency
3845 // Currently supported:
3846 // - G1 pre-barriers (see GraphKit::g1_write_barrier_pre())
3847 void Compile::verify_barriers() {
3848 if (UseG1GC) {
3849 // Verify G1 pre-barriers
3850 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + SATBMarkQueue::byte_offset_of_active());
3851
3852 ResourceArea *area = Thread::current()->resource_area();
3853 Unique_Node_List visited(area);
3854 Node_List worklist(area);
3855 // We're going to walk control flow backwards starting from the Root
3856 worklist.push(_root);
3857 while (worklist.size() > 0) {
3858 Node* x = worklist.pop();
3859 if (x == NULL || x == top()) continue;
3860 if (visited.member(x)) {
3861 continue;
3862 } else {
3863 visited.push(x);
3864 }
3865
3866 if (x->is_Region()) {
3867 for (uint i = 1; i < x->req(); i++) {
3868 worklist.push(x->in(i));
3869 }
3870 } else {
3871 worklist.push(x->in(0));
3872 // We are looking for the pattern:
3873 // /->ThreadLocal
3874 // If->Bool->CmpI->LoadB->AddP->ConL(marking_offset)
3875 // \->ConI(0)
3876 // We want to verify that the If and the LoadB have the same control
3877 // See GraphKit::g1_write_barrier_pre()
3878 if (x->is_If()) {
3879 IfNode *iff = x->as_If();
3880 if (iff->in(1)->is_Bool() && iff->in(1)->in(1)->is_Cmp()) {
3881 CmpNode *cmp = iff->in(1)->in(1)->as_Cmp();
3882 if (cmp->Opcode() == Op_CmpI && cmp->in(2)->is_Con() && cmp->in(2)->bottom_type()->is_int()->get_con() == 0
3883 && cmp->in(1)->is_Load()) {
3884 LoadNode* load = cmp->in(1)->as_Load();
3885 if (load->Opcode() == Op_LoadB && load->in(2)->is_AddP() && load->in(2)->in(2)->Opcode() == Op_ThreadLocal
3886 && load->in(2)->in(3)->is_Con()
3887 && load->in(2)->in(3)->bottom_type()->is_intptr_t()->get_con() == marking_offset) {
3888
3889 Node* if_ctrl = iff->in(0);
3890 Node* load_ctrl = load->in(0);
3891
3892 if (if_ctrl != load_ctrl) {
3893 // Skip possible CProj->NeverBranch in infinite loops
3894 if ((if_ctrl->is_Proj() && if_ctrl->Opcode() == Op_CProj)
3895 && (if_ctrl->in(0)->is_MultiBranch() && if_ctrl->in(0)->Opcode() == Op_NeverBranch)) {
3896 if_ctrl = if_ctrl->in(0)->in(0);
3897 }
3898 }
3899 assert(load_ctrl != NULL && if_ctrl == load_ctrl, "controls must match");
3900 }
3901 }
3902 }
3903 }
3904 }
3905 }
3906 }
3907 }
3908
3909 #endif
3910
3911 // The Compile object keeps track of failure reasons separately from the ciEnv.
3912 // This is required because there is not quite a 1-1 relation between the
3913 // ciEnv and its compilation task and the Compile object. Note that one
3914 // ciEnv might use two Compile objects, if C2Compiler::compile_method decides
3915 // to backtrack and retry without subsuming loads. Other than this backtracking
3916 // behavior, the Compile's failure reason is quietly copied up to the ciEnv
3917 // by the logic in C2Compiler.
3918 void Compile::record_failure(const char* reason) {
3919 if (log() != NULL) {
3920 log()->elem("failure reason='%s' phase='compile'", reason);
3921 }
3922 if (_failure_reason == NULL) {
3923 // Record the first failure reason.
3924 _failure_reason = reason;
3925 }
3926
3927 if (!C->failure_reason_is(C2Compiler::retry_no_subsuming_loads())) {
3928 C->print_method(PHASE_FAILURE);
3929 }
3930 _root = NULL; // flush the graph, too
3931 }
3932
3933 Compile::TracePhase::TracePhase(const char* name, elapsedTimer* accumulator)
3934 : TraceTime(name, accumulator, CITime, CITimeVerbose),
3935 _phase_name(name), _dolog(CITimeVerbose)
3936 {
3937 if (_dolog) {
3938 C = Compile::current();
3939 _log = C->log();
3940 } else {
3941 C = NULL;
3942 _log = NULL;
3943 }
3944 if (_log != NULL) {
3945 _log->begin_head("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes());
3946 _log->stamp();
3947 _log->end_head();
3948 }
3949 }
3950
3951 Compile::TracePhase::~TracePhase() {
3952
3953 C = Compile::current();
3954 if (_dolog) {
3955 _log = C->log();
3956 } else {
3957 _log = NULL;
3958 }
3959
3960 #ifdef ASSERT
3961 if (PrintIdealNodeCount) {
3962 tty->print_cr("phase name='%s' nodes='%d' live='%d' live_graph_walk='%d'",
3963 _phase_name, C->unique(), C->live_nodes(), C->count_live_nodes_by_graph_walk());
3964 }
3965
3966 if (VerifyIdealNodeCount) {
3967 Compile::current()->print_missing_nodes();
3968 }
3969 #endif
3970
3971 if (_log != NULL) {
3972 _log->done("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes());
3973 }
3974 }
3975
3976 //=============================================================================
3977 // Two Constant's are equal when the type and the value are equal.
3978 bool Compile::Constant::operator==(const Constant& other) {
3979 if (type() != other.type() ) return false;
3980 if (can_be_reused() != other.can_be_reused()) return false;
3981 // For floating point values we compare the bit pattern.
3982 switch (type()) {
3983 case T_INT:
3984 case T_FLOAT: return (_v._value.i == other._v._value.i);
3985 case T_LONG:
3986 case T_DOUBLE: return (_v._value.j == other._v._value.j);
3987 case T_OBJECT:
3988 case T_ADDRESS: return (_v._value.l == other._v._value.l);
3989 case T_VOID: return (_v._value.l == other._v._value.l); // jump-table entries
3990 case T_METADATA: return (_v._metadata == other._v._metadata);
3991 default: ShouldNotReachHere();
3992 }
3993 return false;
3994 }
3995
3996 static int type_to_size_in_bytes(BasicType t) {
3997 switch (t) {
3998 case T_INT: return sizeof(jint );
3999 case T_LONG: return sizeof(jlong );
4000 case T_FLOAT: return sizeof(jfloat );
4001 case T_DOUBLE: return sizeof(jdouble);
4002 case T_METADATA: return sizeof(Metadata*);
4003 // We use T_VOID as marker for jump-table entries (labels) which
4004 // need an internal word relocation.
4005 case T_VOID:
4006 case T_ADDRESS:
4007 case T_OBJECT: return sizeof(jobject);
4008 }
4009
4010 ShouldNotReachHere();
4011 return -1;
4012 }
4013
4014 int Compile::ConstantTable::qsort_comparator(Constant* a, Constant* b) {
4015 // sort descending
4016 if (a->freq() > b->freq()) return -1;
4017 if (a->freq() < b->freq()) return 1;
4018 return 0;
4019 }
4020
4021 void Compile::ConstantTable::calculate_offsets_and_size() {
4022 // First, sort the array by frequencies.
4023 _constants.sort(qsort_comparator);
4024
4025 #ifdef ASSERT
4026 // Make sure all jump-table entries were sorted to the end of the
4027 // array (they have a negative frequency).
4028 bool found_void = false;
4029 for (int i = 0; i < _constants.length(); i++) {
4030 Constant con = _constants.at(i);
4031 if (con.type() == T_VOID)
4032 found_void = true; // jump-tables
4033 else
4034 assert(!found_void, "wrong sorting");
4035 }
4036 #endif
4037
4038 int offset = 0;
4039 for (int i = 0; i < _constants.length(); i++) {
4040 Constant* con = _constants.adr_at(i);
4041
4042 // Align offset for type.
4043 int typesize = type_to_size_in_bytes(con->type());
4044 offset = align_size_up(offset, typesize);
4045 con->set_offset(offset); // set constant's offset
4046
4047 if (con->type() == T_VOID) {
4048 MachConstantNode* n = (MachConstantNode*) con->get_jobject();
4049 offset = offset + typesize * n->outcnt(); // expand jump-table
4050 } else {
4051 offset = offset + typesize;
4052 }
4053 }
4054
4055 // Align size up to the next section start (which is insts; see
4056 // CodeBuffer::align_at_start).
4057 assert(_size == -1, "already set?");
4058 _size = align_size_up(offset, CodeEntryAlignment);
4059 }
4060
4061 void Compile::ConstantTable::emit(CodeBuffer& cb) {
4062 MacroAssembler _masm(&cb);
4063 for (int i = 0; i < _constants.length(); i++) {
4064 Constant con = _constants.at(i);
4065 address constant_addr = NULL;
4066 switch (con.type()) {
4067 case T_INT: constant_addr = _masm.int_constant( con.get_jint() ); break;
4068 case T_LONG: constant_addr = _masm.long_constant( con.get_jlong() ); break;
4069 case T_FLOAT: constant_addr = _masm.float_constant( con.get_jfloat() ); break;
4070 case T_DOUBLE: constant_addr = _masm.double_constant(con.get_jdouble()); break;
4071 case T_OBJECT: {
4072 jobject obj = con.get_jobject();
4073 int oop_index = _masm.oop_recorder()->find_index(obj);
4074 constant_addr = _masm.address_constant((address) obj, oop_Relocation::spec(oop_index));
4075 break;
4076 }
4077 case T_ADDRESS: {
4078 address addr = (address) con.get_jobject();
4079 constant_addr = _masm.address_constant(addr);
4080 break;
4081 }
4082 // We use T_VOID as marker for jump-table entries (labels) which
4083 // need an internal word relocation.
4084 case T_VOID: {
4085 MachConstantNode* n = (MachConstantNode*) con.get_jobject();
4086 // Fill the jump-table with a dummy word. The real value is
4087 // filled in later in fill_jump_table.
4088 address dummy = (address) n;
4089 constant_addr = _masm.address_constant(dummy);
4090 // Expand jump-table
4091 for (uint i = 1; i < n->outcnt(); i++) {
4092 address temp_addr = _masm.address_constant(dummy + i);
4093 assert(temp_addr, "consts section too small");
4094 }
4095 break;
4096 }
4097 case T_METADATA: {
4098 Metadata* obj = con.get_metadata();
4099 int metadata_index = _masm.oop_recorder()->find_index(obj);
4100 constant_addr = _masm.address_constant((address) obj, metadata_Relocation::spec(metadata_index));
4101 break;
4102 }
4103 default: ShouldNotReachHere();
4104 }
4105 assert(constant_addr, "consts section too small");
4106 assert((constant_addr - _masm.code()->consts()->start()) == con.offset(),
4107 "must be: %d == %d", (int) (constant_addr - _masm.code()->consts()->start()), (int)(con.offset()));
4108 }
4109 }
4110
4111 int Compile::ConstantTable::find_offset(Constant& con) const {
4112 int idx = _constants.find(con);
4113 assert(idx != -1, "constant must be in constant table");
4114 int offset = _constants.at(idx).offset();
4115 assert(offset != -1, "constant table not emitted yet?");
4116 return offset;
4117 }
4118
4119 void Compile::ConstantTable::add(Constant& con) {
4120 if (con.can_be_reused()) {
4121 int idx = _constants.find(con);
4122 if (idx != -1 && _constants.at(idx).can_be_reused()) {
4123 _constants.adr_at(idx)->inc_freq(con.freq()); // increase the frequency by the current value
4124 return;
4125 }
4126 }
4127 (void) _constants.append(con);
4128 }
4129
4130 Compile::Constant Compile::ConstantTable::add(MachConstantNode* n, BasicType type, jvalue value) {
4131 Block* b = Compile::current()->cfg()->get_block_for_node(n);
4132 Constant con(type, value, b->_freq);
4133 add(con);
4134 return con;
4135 }
4136
4137 Compile::Constant Compile::ConstantTable::add(Metadata* metadata) {
4138 Constant con(metadata);
4139 add(con);
4140 return con;
4141 }
4142
4143 Compile::Constant Compile::ConstantTable::add(MachConstantNode* n, MachOper* oper) {
4144 jvalue value;
4145 BasicType type = oper->type()->basic_type();
4146 switch (type) {
4147 case T_LONG: value.j = oper->constantL(); break;
4148 case T_FLOAT: value.f = oper->constantF(); break;
4149 case T_DOUBLE: value.d = oper->constantD(); break;
4150 case T_OBJECT:
4151 case T_ADDRESS: value.l = (jobject) oper->constant(); break;
4152 case T_METADATA: return add((Metadata*)oper->constant()); break;
4153 default: guarantee(false, "unhandled type: %s", type2name(type));
4154 }
4155 return add(n, type, value);
4156 }
4157
4158 Compile::Constant Compile::ConstantTable::add_jump_table(MachConstantNode* n) {
4159 jvalue value;
4160 // We can use the node pointer here to identify the right jump-table
4161 // as this method is called from Compile::Fill_buffer right before
4162 // the MachNodes are emitted and the jump-table is filled (means the
4163 // MachNode pointers do not change anymore).
4164 value.l = (jobject) n;
4165 Constant con(T_VOID, value, next_jump_table_freq(), false); // Labels of a jump-table cannot be reused.
4166 add(con);
4167 return con;
4168 }
4169
4170 void Compile::ConstantTable::fill_jump_table(CodeBuffer& cb, MachConstantNode* n, GrowableArray<Label*> labels) const {
4171 // If called from Compile::scratch_emit_size do nothing.
4172 if (Compile::current()->in_scratch_emit_size()) return;
4173
4174 assert(labels.is_nonempty(), "must be");
4175 assert((uint) labels.length() == n->outcnt(), "must be equal: %d == %d", labels.length(), n->outcnt());
4176
4177 // Since MachConstantNode::constant_offset() also contains
4178 // table_base_offset() we need to subtract the table_base_offset()
4179 // to get the plain offset into the constant table.
4180 int offset = n->constant_offset() - table_base_offset();
4181
4182 MacroAssembler _masm(&cb);
4183 address* jump_table_base = (address*) (_masm.code()->consts()->start() + offset);
4184
4185 for (uint i = 0; i < n->outcnt(); i++) {
4186 address* constant_addr = &jump_table_base[i];
4187 assert(*constant_addr == (((address) n) + i), "all jump-table entries must contain adjusted node pointer: " INTPTR_FORMAT " == " INTPTR_FORMAT, p2i(*constant_addr), p2i(((address) n) + i));
4188 *constant_addr = cb.consts()->target(*labels.at(i), (address) constant_addr);
4189 cb.consts()->relocate((address) constant_addr, relocInfo::internal_word_type);
4190 }
4191 }
4192
4193 //----------------------------static_subtype_check-----------------------------
4194 // Shortcut important common cases when superklass is exact:
4195 // (0) superklass is java.lang.Object (can occur in reflective code)
4196 // (1) subklass is already limited to a subtype of superklass => always ok
4197 // (2) subklass does not overlap with superklass => always fail
4198 // (3) superklass has NO subtypes and we can check with a simple compare.
4199 int Compile::static_subtype_check(ciKlass* superk, ciKlass* subk) {
4200 if (StressReflectiveCode || superk == NULL || subk == NULL) {
4201 return SSC_full_test; // Let caller generate the general case.
4202 }
4203
4204 if (!EnableMVT && !EnableValhalla && superk == env()->Object_klass()) {
4205 return SSC_always_true; // (0) this test cannot fail
4206 }
4207
4208 ciType* superelem = superk;
4209 if (superelem->is_array_klass())
4210 superelem = superelem->as_array_klass()->base_element_type();
4211
4212 if (!subk->is_interface()) { // cannot trust static interface types yet
4213 if (subk->is_subtype_of(superk)) {
4214 return SSC_always_true; // (1) false path dead; no dynamic test needed
4215 }
4216 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) &&
4217 !superk->is_subtype_of(subk)) {
4218 return SSC_always_false;
4219 }
4220 }
4221
4222 // If casting to an instance klass, it must have no subtypes
4223 if (superk->is_interface()) {
4224 // Cannot trust interfaces yet.
4225 // %%% S.B. superk->nof_implementors() == 1
4226 } else if (superelem->is_instance_klass()) {
4227 ciInstanceKlass* ik = superelem->as_instance_klass();
4228 if (!ik->has_subklass() && !ik->is_interface()) {
4229 if (!ik->is_final()) {
4230 // Add a dependency if there is a chance of a later subclass.
4231 dependencies()->assert_leaf_type(ik);
4232 }
4233 return SSC_easy_test; // (3) caller can do a simple ptr comparison
4234 }
4235 } else {
4236 // A primitive array type has no subtypes.
4237 return SSC_easy_test; // (3) caller can do a simple ptr comparison
4238 }
4239
4240 return SSC_full_test;
4241 }
4242
4243 Node* Compile::conv_I2X_index(PhaseGVN* phase, Node* idx, const TypeInt* sizetype, Node* ctrl) {
4244 #ifdef _LP64
4245 // The scaled index operand to AddP must be a clean 64-bit value.
4246 // Java allows a 32-bit int to be incremented to a negative
4247 // value, which appears in a 64-bit register as a large
4248 // positive number. Using that large positive number as an
4249 // operand in pointer arithmetic has bad consequences.
4250 // On the other hand, 32-bit overflow is rare, and the possibility
4251 // can often be excluded, if we annotate the ConvI2L node with
4252 // a type assertion that its value is known to be a small positive
4253 // number. (The prior range check has ensured this.)
4254 // This assertion is used by ConvI2LNode::Ideal.
4255 int index_max = max_jint - 1; // array size is max_jint, index is one less
4256 if (sizetype != NULL) index_max = sizetype->_hi - 1;
4257 const TypeInt* iidxtype = TypeInt::make(0, index_max, Type::WidenMax);
4258 idx = constrained_convI2L(phase, idx, iidxtype, ctrl);
4259 #endif
4260 return idx;
4261 }
4262
4263 // Convert integer value to a narrowed long type dependent on ctrl (for example, a range check)
4264 Node* Compile::constrained_convI2L(PhaseGVN* phase, Node* value, const TypeInt* itype, Node* ctrl) {
4265 if (ctrl != NULL) {
4266 // Express control dependency by a CastII node with a narrow type.
4267 value = new CastIINode(value, itype, false, true /* range check dependency */);
4268 // Make the CastII node dependent on the control input to prevent the narrowed ConvI2L
4269 // node from floating above the range check during loop optimizations. Otherwise, the
4270 // ConvI2L node may be eliminated independently of the range check, causing the data path
4271 // to become TOP while the control path is still there (although it's unreachable).
4272 value->set_req(0, ctrl);
4273 // Save CastII node to remove it after loop optimizations.
4274 phase->C->add_range_check_cast(value);
4275 value = phase->transform(value);
4276 }
4277 const TypeLong* ltype = TypeLong::make(itype->_lo, itype->_hi, itype->_widen);
4278 return phase->transform(new ConvI2LNode(value, ltype));
4279 }
4280
4281 // The message about the current inlining is accumulated in
4282 // _print_inlining_stream and transfered into the _print_inlining_list
4283 // once we know whether inlining succeeds or not. For regular
4284 // inlining, messages are appended to the buffer pointed by
4285 // _print_inlining_idx in the _print_inlining_list. For late inlining,
4286 // a new buffer is added after _print_inlining_idx in the list. This
4287 // way we can update the inlining message for late inlining call site
4288 // when the inlining is attempted again.
4289 void Compile::print_inlining_init() {
4290 if (print_inlining() || print_intrinsics()) {
4291 _print_inlining_stream = new stringStream();
4292 _print_inlining_list = new (comp_arena())GrowableArray<PrintInliningBuffer>(comp_arena(), 1, 1, PrintInliningBuffer());
4293 }
4294 }
4295
4296 void Compile::print_inlining_reinit() {
4297 if (print_inlining() || print_intrinsics()) {
4298 // Re allocate buffer when we change ResourceMark
4299 _print_inlining_stream = new stringStream();
4300 }
4301 }
4302
4303 void Compile::print_inlining_reset() {
4304 _print_inlining_stream->reset();
4305 }
4306
4307 void Compile::print_inlining_commit() {
4308 assert(print_inlining() || print_intrinsics(), "PrintInlining off?");
4309 // Transfer the message from _print_inlining_stream to the current
4310 // _print_inlining_list buffer and clear _print_inlining_stream.
4311 _print_inlining_list->at(_print_inlining_idx).ss()->write(_print_inlining_stream->as_string(), _print_inlining_stream->size());
4312 print_inlining_reset();
4313 }
4314
4315 void Compile::print_inlining_push() {
4316 // Add new buffer to the _print_inlining_list at current position
4317 _print_inlining_idx++;
4318 _print_inlining_list->insert_before(_print_inlining_idx, PrintInliningBuffer());
4319 }
4320
4321 Compile::PrintInliningBuffer& Compile::print_inlining_current() {
4322 return _print_inlining_list->at(_print_inlining_idx);
4323 }
4324
4325 void Compile::print_inlining_update(CallGenerator* cg) {
4326 if (print_inlining() || print_intrinsics()) {
4327 if (!cg->is_late_inline()) {
4328 if (print_inlining_current().cg() != NULL) {
4329 print_inlining_push();
4330 }
4331 print_inlining_commit();
4332 } else {
4333 if (print_inlining_current().cg() != cg &&
4334 (print_inlining_current().cg() != NULL ||
4335 print_inlining_current().ss()->size() != 0)) {
4336 print_inlining_push();
4337 }
4338 print_inlining_commit();
4339 print_inlining_current().set_cg(cg);
4340 }
4341 }
4342 }
4343
4344 void Compile::print_inlining_move_to(CallGenerator* cg) {
4345 // We resume inlining at a late inlining call site. Locate the
4346 // corresponding inlining buffer so that we can update it.
4347 if (print_inlining()) {
4348 for (int i = 0; i < _print_inlining_list->length(); i++) {
4349 if (_print_inlining_list->adr_at(i)->cg() == cg) {
4350 _print_inlining_idx = i;
4351 return;
4352 }
4353 }
4354 ShouldNotReachHere();
4355 }
4356 }
4357
4358 void Compile::print_inlining_update_delayed(CallGenerator* cg) {
4359 if (print_inlining()) {
4360 assert(_print_inlining_stream->size() > 0, "missing inlining msg");
4361 assert(print_inlining_current().cg() == cg, "wrong entry");
4362 // replace message with new message
4363 _print_inlining_list->at_put(_print_inlining_idx, PrintInliningBuffer());
4364 print_inlining_commit();
4365 print_inlining_current().set_cg(cg);
4366 }
4367 }
4368
4369 void Compile::print_inlining_assert_ready() {
4370 assert(!_print_inlining || _print_inlining_stream->size() == 0, "loosing data");
4371 }
4372
4373 void Compile::process_print_inlining() {
4374 bool do_print_inlining = print_inlining() || print_intrinsics();
4375 if (do_print_inlining || log() != NULL) {
4376 // Print inlining message for candidates that we couldn't inline
4377 // for lack of space
4378 for (int i = 0; i < _late_inlines.length(); i++) {
4379 CallGenerator* cg = _late_inlines.at(i);
4380 if (!cg->is_mh_late_inline()) {
4381 const char* msg = "live nodes > LiveNodeCountInliningCutoff";
4382 if (do_print_inlining) {
4383 cg->print_inlining_late(msg);
4384 }
4385 log_late_inline_failure(cg, msg);
4386 }
4387 }
4388 }
4389 if (do_print_inlining) {
4390 ResourceMark rm;
4391 stringStream ss;
4392 for (int i = 0; i < _print_inlining_list->length(); i++) {
4393 ss.print("%s", _print_inlining_list->adr_at(i)->ss()->as_string());
4394 }
4395 size_t end = ss.size();
4396 _print_inlining_output = NEW_ARENA_ARRAY(comp_arena(), char, end+1);
4397 strncpy(_print_inlining_output, ss.base(), end+1);
4398 _print_inlining_output[end] = 0;
4399 }
4400 }
4401
4402 void Compile::dump_print_inlining() {
4403 if (_print_inlining_output != NULL) {
4404 tty->print_raw(_print_inlining_output);
4405 }
4406 }
4407
4408 void Compile::log_late_inline(CallGenerator* cg) {
4409 if (log() != NULL) {
4410 log()->head("late_inline method='%d' inline_id='" JLONG_FORMAT "'", log()->identify(cg->method()),
4411 cg->unique_id());
4412 JVMState* p = cg->call_node()->jvms();
4413 while (p != NULL) {
4414 log()->elem("jvms bci='%d' method='%d'", p->bci(), log()->identify(p->method()));
4415 p = p->caller();
4416 }
4417 log()->tail("late_inline");
4418 }
4419 }
4420
4421 void Compile::log_late_inline_failure(CallGenerator* cg, const char* msg) {
4422 log_late_inline(cg);
4423 if (log() != NULL) {
4424 log()->inline_fail(msg);
4425 }
4426 }
4427
4428 void Compile::log_inline_id(CallGenerator* cg) {
4429 if (log() != NULL) {
4430 // The LogCompilation tool needs a unique way to identify late
4431 // inline call sites. This id must be unique for this call site in
4432 // this compilation. Try to have it unique across compilations as
4433 // well because it can be convenient when grepping through the log
4434 // file.
4435 // Distinguish OSR compilations from others in case CICountOSR is
4436 // on.
4437 jlong id = ((jlong)unique()) + (((jlong)compile_id()) << 33) + (CICountOSR && is_osr_compilation() ? ((jlong)1) << 32 : 0);
4438 cg->set_unique_id(id);
4439 log()->elem("inline_id id='" JLONG_FORMAT "'", id);
4440 }
4441 }
4442
4443 void Compile::log_inline_failure(const char* msg) {
4444 if (C->log() != NULL) {
4445 C->log()->inline_fail(msg);
4446 }
4447 }
4448
4449
4450 // Dump inlining replay data to the stream.
4451 // Don't change thread state and acquire any locks.
4452 void Compile::dump_inline_data(outputStream* out) {
4453 InlineTree* inl_tree = ilt();
4454 if (inl_tree != NULL) {
4455 out->print(" inline %d", inl_tree->count());
4456 inl_tree->dump_replay_data(out);
4457 }
4458 }
4459
4460 int Compile::cmp_expensive_nodes(Node* n1, Node* n2) {
4461 if (n1->Opcode() < n2->Opcode()) return -1;
4462 else if (n1->Opcode() > n2->Opcode()) return 1;
4463
4464 assert(n1->req() == n2->req(), "can't compare %s nodes: n1->req() = %d, n2->req() = %d", NodeClassNames[n1->Opcode()], n1->req(), n2->req());
4465 for (uint i = 1; i < n1->req(); i++) {
4466 if (n1->in(i) < n2->in(i)) return -1;
4467 else if (n1->in(i) > n2->in(i)) return 1;
4468 }
4469
4470 return 0;
4471 }
4472
4473 int Compile::cmp_expensive_nodes(Node** n1p, Node** n2p) {
4474 Node* n1 = *n1p;
4475 Node* n2 = *n2p;
4476
4477 return cmp_expensive_nodes(n1, n2);
4478 }
4479
4480 void Compile::sort_expensive_nodes() {
4481 if (!expensive_nodes_sorted()) {
4482 _expensive_nodes->sort(cmp_expensive_nodes);
4483 }
4484 }
4485
4486 bool Compile::expensive_nodes_sorted() const {
4487 for (int i = 1; i < _expensive_nodes->length(); i++) {
4488 if (cmp_expensive_nodes(_expensive_nodes->adr_at(i), _expensive_nodes->adr_at(i-1)) < 0) {
4489 return false;
4490 }
4491 }
4492 return true;
4493 }
4494
4495 bool Compile::should_optimize_expensive_nodes(PhaseIterGVN &igvn) {
4496 if (_expensive_nodes->length() == 0) {
4497 return false;
4498 }
4499
4500 assert(OptimizeExpensiveOps, "optimization off?");
4501
4502 // Take this opportunity to remove dead nodes from the list
4503 int j = 0;
4504 for (int i = 0; i < _expensive_nodes->length(); i++) {
4505 Node* n = _expensive_nodes->at(i);
4506 if (!n->is_unreachable(igvn)) {
4507 assert(n->is_expensive(), "should be expensive");
4508 _expensive_nodes->at_put(j, n);
4509 j++;
4510 }
4511 }
4512 _expensive_nodes->trunc_to(j);
4513
4514 // Then sort the list so that similar nodes are next to each other
4515 // and check for at least two nodes of identical kind with same data
4516 // inputs.
4517 sort_expensive_nodes();
4518
4519 for (int i = 0; i < _expensive_nodes->length()-1; i++) {
4520 if (cmp_expensive_nodes(_expensive_nodes->adr_at(i), _expensive_nodes->adr_at(i+1)) == 0) {
4521 return true;
4522 }
4523 }
4524
4525 return false;
4526 }
4527
4528 void Compile::cleanup_expensive_nodes(PhaseIterGVN &igvn) {
4529 if (_expensive_nodes->length() == 0) {
4530 return;
4531 }
4532
4533 assert(OptimizeExpensiveOps, "optimization off?");
4534
4535 // Sort to bring similar nodes next to each other and clear the
4536 // control input of nodes for which there's only a single copy.
4537 sort_expensive_nodes();
4538
4539 int j = 0;
4540 int identical = 0;
4541 int i = 0;
4542 bool modified = false;
4543 for (; i < _expensive_nodes->length()-1; i++) {
4544 assert(j <= i, "can't write beyond current index");
4545 if (_expensive_nodes->at(i)->Opcode() == _expensive_nodes->at(i+1)->Opcode()) {
4546 identical++;
4547 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
4548 continue;
4549 }
4550 if (identical > 0) {
4551 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
4552 identical = 0;
4553 } else {
4554 Node* n = _expensive_nodes->at(i);
4555 igvn.replace_input_of(n, 0, NULL);
4556 igvn.hash_insert(n);
4557 modified = true;
4558 }
4559 }
4560 if (identical > 0) {
4561 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
4562 } else if (_expensive_nodes->length() >= 1) {
4563 Node* n = _expensive_nodes->at(i);
4564 igvn.replace_input_of(n, 0, NULL);
4565 igvn.hash_insert(n);
4566 modified = true;
4567 }
4568 _expensive_nodes->trunc_to(j);
4569 if (modified) {
4570 igvn.optimize();
4571 }
4572 }
4573
4574 void Compile::add_expensive_node(Node * n) {
4575 assert(!_expensive_nodes->contains(n), "duplicate entry in expensive list");
4576 assert(n->is_expensive(), "expensive nodes with non-null control here only");
4577 assert(!n->is_CFG() && !n->is_Mem(), "no cfg or memory nodes here");
4578 if (OptimizeExpensiveOps) {
4579 _expensive_nodes->append(n);
4580 } else {
4581 // Clear control input and let IGVN optimize expensive nodes if
4582 // OptimizeExpensiveOps is off.
4583 n->set_req(0, NULL);
4584 }
4585 }
4586
4587 /**
4588 * Remove the speculative part of types and clean up the graph
4589 */
4590 void Compile::remove_speculative_types(PhaseIterGVN &igvn) {
4591 if (UseTypeSpeculation) {
4592 Unique_Node_List worklist;
4593 worklist.push(root());
4594 int modified = 0;
4595 // Go over all type nodes that carry a speculative type, drop the
4596 // speculative part of the type and enqueue the node for an igvn
4597 // which may optimize it out.
4598 for (uint next = 0; next < worklist.size(); ++next) {
4599 Node *n = worklist.at(next);
4600 if (n->is_Type()) {
4601 TypeNode* tn = n->as_Type();
4602 const Type* t = tn->type();
4603 const Type* t_no_spec = t->remove_speculative();
4604 if (t_no_spec != t) {
4605 bool in_hash = igvn.hash_delete(n);
4606 assert(in_hash, "node should be in igvn hash table");
4607 tn->set_type(t_no_spec);
4608 igvn.hash_insert(n);
4609 igvn._worklist.push(n); // give it a chance to go away
4610 modified++;
4611 }
4612 }
4613 uint max = n->len();
4614 for( uint i = 0; i < max; ++i ) {
4615 Node *m = n->in(i);
4616 if (not_a_node(m)) continue;
4617 worklist.push(m);
4618 }
4619 }
4620 // Drop the speculative part of all types in the igvn's type table
4621 igvn.remove_speculative_types();
4622 if (modified > 0) {
4623 igvn.optimize();
4624 }
4625 #ifdef ASSERT
4626 // Verify that after the IGVN is over no speculative type has resurfaced
4627 worklist.clear();
4628 worklist.push(root());
4629 for (uint next = 0; next < worklist.size(); ++next) {
4630 Node *n = worklist.at(next);
4631 const Type* t = igvn.type_or_null(n);
4632 assert((t == NULL) || (t == t->remove_speculative()), "no more speculative types");
4633 if (n->is_Type()) {
4634 t = n->as_Type()->type();
4635 assert(t == t->remove_speculative(), "no more speculative types");
4636 }
4637 uint max = n->len();
4638 for( uint i = 0; i < max; ++i ) {
4639 Node *m = n->in(i);
4640 if (not_a_node(m)) continue;
4641 worklist.push(m);
4642 }
4643 }
4644 igvn.check_no_speculative_types();
4645 #endif
4646 }
4647 }
4648
4649 // Auxiliary method to support randomized stressing/fuzzing.
4650 //
4651 // This method can be called the arbitrary number of times, with current count
4652 // as the argument. The logic allows selecting a single candidate from the
4653 // running list of candidates as follows:
4654 // int count = 0;
4655 // Cand* selected = null;
4656 // while(cand = cand->next()) {
4657 // if (randomized_select(++count)) {
4658 // selected = cand;
4659 // }
4660 // }
4661 //
4662 // Including count equalizes the chances any candidate is "selected".
4663 // This is useful when we don't have the complete list of candidates to choose
4664 // from uniformly. In this case, we need to adjust the randomicity of the
4665 // selection, or else we will end up biasing the selection towards the latter
4666 // candidates.
4667 //
4668 // Quick back-envelope calculation shows that for the list of n candidates
4669 // the equal probability for the candidate to persist as "best" can be
4670 // achieved by replacing it with "next" k-th candidate with the probability
4671 // of 1/k. It can be easily shown that by the end of the run, the
4672 // probability for any candidate is converged to 1/n, thus giving the
4673 // uniform distribution among all the candidates.
4674 //
4675 // We don't care about the domain size as long as (RANDOMIZED_DOMAIN / count) is large.
4676 #define RANDOMIZED_DOMAIN_POW 29
4677 #define RANDOMIZED_DOMAIN (1 << RANDOMIZED_DOMAIN_POW)
4678 #define RANDOMIZED_DOMAIN_MASK ((1 << (RANDOMIZED_DOMAIN_POW + 1)) - 1)
4679 bool Compile::randomized_select(int count) {
4680 assert(count > 0, "only positive");
4681 return (os::random() & RANDOMIZED_DOMAIN_MASK) < (RANDOMIZED_DOMAIN / count);
4682 }
4683
4684 CloneMap& Compile::clone_map() { return _clone_map; }
4685 void Compile::set_clone_map(Dict* d) { _clone_map._dict = d; }
4686
4687 void NodeCloneInfo::dump() const {
4688 tty->print(" {%d:%d} ", idx(), gen());
4689 }
4690
4691 void CloneMap::clone(Node* old, Node* nnn, int gen) {
4692 uint64_t val = value(old->_idx);
4693 NodeCloneInfo cio(val);
4694 assert(val != 0, "old node should be in the map");
4695 NodeCloneInfo cin(cio.idx(), gen + cio.gen());
4696 insert(nnn->_idx, cin.get());
4697 #ifndef PRODUCT
4698 if (is_debug()) {
4699 tty->print_cr("CloneMap::clone inserted node %d info {%d:%d} into CloneMap", nnn->_idx, cin.idx(), cin.gen());
4700 }
4701 #endif
4702 }
4703
4704 void CloneMap::verify_insert_and_clone(Node* old, Node* nnn, int gen) {
4705 NodeCloneInfo cio(value(old->_idx));
4706 if (cio.get() == 0) {
4707 cio.set(old->_idx, 0);
4708 insert(old->_idx, cio.get());
4709 #ifndef PRODUCT
4710 if (is_debug()) {
4711 tty->print_cr("CloneMap::verify_insert_and_clone inserted node %d info {%d:%d} into CloneMap", old->_idx, cio.idx(), cio.gen());
4712 }
4713 #endif
4714 }
4715 clone(old, nnn, gen);
4716 }
4717
4718 int CloneMap::max_gen() const {
4719 int g = 0;
4720 DictI di(_dict);
4721 for(; di.test(); ++di) {
4722 int t = gen(di._key);
4723 if (g < t) {
4724 g = t;
4725 #ifndef PRODUCT
4726 if (is_debug()) {
4727 tty->print_cr("CloneMap::max_gen() update max=%d from %d", g, _2_node_idx_t(di._key));
4728 }
4729 #endif
4730 }
4731 }
4732 return g;
4733 }
4734
4735 void CloneMap::dump(node_idx_t key) const {
4736 uint64_t val = value(key);
4737 if (val != 0) {
4738 NodeCloneInfo ni(val);
4739 ni.dump();
4740 }
4741 }
4742
4743 // Helper function for enforcing certain bytecodes to reexecute if
4744 // deoptimization happens
4745 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) {
4746 ciMethod* cur_method = jvms->method();
4747 int cur_bci = jvms->bci();
4748 if (cur_method != NULL && cur_bci != InvocationEntryBci) {
4749 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci);
4750 return Interpreter::bytecode_should_reexecute(code) ||
4751 is_anewarray && code == Bytecodes::_multianewarray;
4752 // Reexecute _multianewarray bytecode which was replaced with
4753 // sequence of [a]newarray. See Parse::do_multianewarray().
4754 //
4755 // Note: interpreter should not have it set since this optimization
4756 // is limited by dimensions and guarded by flag so in some cases
4757 // multianewarray() runtime calls will be generated and
4758 // the bytecode should not be reexecutes (stack will not be reset).
4759 } else
4760 return false;
4761 }
4762
4763 void Compile::add_safepoint_edges(SafePointNode* call, JVMState* youngest_jvms, bool can_prune_locals, uint stack_slots_not_pruned) {
4764 // do not scribble on the input jvms
4765 JVMState* out_jvms = youngest_jvms->clone_deep(C);
4766 call->set_jvms(out_jvms); // Start jvms list for call node
4767
4768 // For a known set of bytecodes, the interpreter should reexecute them if
4769 // deoptimization happens. We set the reexecute state for them here
4770 if (out_jvms->is_reexecute_undefined() && //don't change if already specified
4771 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) {
4772 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed
4773 }
4774
4775 // Presize the call:
4776 DEBUG_ONLY(uint non_debug_edges = call->req());
4777 call->add_req_batch(top(), youngest_jvms->debug_depth());
4778 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), "");
4779
4780 // Set up edges so that the call looks like this:
4781 // Call [state:] ctl io mem fptr retadr
4782 // [parms:] parm0 ... parmN
4783 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN
4784 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...]
4785 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN
4786 // Note that caller debug info precedes callee debug info.
4787
4788 // Fill pointer walks backwards from "young:" to "root:" in the diagram above:
4789 uint debug_ptr = call->req();
4790
4791 // Loop over the map input edges associated with jvms, add them
4792 // to the call node, & reset all offsets to match call node array.
4793 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) {
4794 uint debug_end = debug_ptr;
4795 uint debug_start = debug_ptr - in_jvms->debug_size();
4796 debug_ptr = debug_start; // back up the ptr
4797
4798 uint p = debug_start; // walks forward in [debug_start, debug_end)
4799 uint j, k, l;
4800 SafePointNode* in_map = in_jvms->map();
4801 out_jvms->set_map(call);
4802
4803 if (can_prune_locals) {
4804 assert(in_jvms->method() == out_jvms->method(), "sanity");
4805 // If the current throw can reach an exception handler in this JVMS,
4806 // then we must keep everything live that can reach that handler.
4807 // As a quick and dirty approximation, we look for any handlers at all.
4808 if (in_jvms->method()->has_exception_handlers()) {
4809 can_prune_locals = false;
4810 }
4811 }
4812
4813 // Add the Locals
4814 k = in_jvms->locoff();
4815 l = in_jvms->loc_size();
4816 out_jvms->set_locoff(p);
4817 if (!can_prune_locals) {
4818 for (j = 0; j < l; j++)
4819 call->set_req(p++, in_map->in(k+j));
4820 } else {
4821 p += l; // already set to top above by add_req_batch
4822 }
4823
4824 // Add the Expression Stack
4825 k = in_jvms->stkoff();
4826 l = in_jvms->sp();
4827 out_jvms->set_stkoff(p);
4828 if (!can_prune_locals) {
4829 for (j = 0; j < l; j++)
4830 call->set_req(p++, in_map->in(k+j));
4831 } else if (can_prune_locals && stack_slots_not_pruned != 0) {
4832 // Divide stack into {S0,...,S1}, where S0 is set to top.
4833 uint s1 = stack_slots_not_pruned;
4834 stack_slots_not_pruned = 0; // for next iteration
4835 if (s1 > l) s1 = l;
4836 uint s0 = l - s1;
4837 p += s0; // skip the tops preinstalled by add_req_batch
4838 for (j = s0; j < l; j++)
4839 call->set_req(p++, in_map->in(k+j));
4840 } else {
4841 p += l; // already set to top above by add_req_batch
4842 }
4843
4844 // Add the Monitors
4845 k = in_jvms->monoff();
4846 l = in_jvms->mon_size();
4847 out_jvms->set_monoff(p);
4848 for (j = 0; j < l; j++)
4849 call->set_req(p++, in_map->in(k+j));
4850
4851 // Copy any scalar object fields.
4852 k = in_jvms->scloff();
4853 l = in_jvms->scl_size();
4854 out_jvms->set_scloff(p);
4855 for (j = 0; j < l; j++)
4856 call->set_req(p++, in_map->in(k+j));
4857
4858 // Finish the new jvms.
4859 out_jvms->set_endoff(p);
4860
4861 assert(out_jvms->endoff() == debug_end, "fill ptr must match");
4862 assert(out_jvms->depth() == in_jvms->depth(), "depth must match");
4863 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match");
4864 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match");
4865 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match");
4866 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match");
4867
4868 // Update the two tail pointers in parallel.
4869 out_jvms = out_jvms->caller();
4870 in_jvms = in_jvms->caller();
4871 }
4872
4873 assert(debug_ptr == non_debug_edges, "debug info must fit exactly");
4874
4875 // Test the correctness of JVMState::debug_xxx accessors:
4876 assert(call->jvms()->debug_start() == non_debug_edges, "");
4877 assert(call->jvms()->debug_end() == call->req(), "");
4878 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, "");
4879 }