1 /*
2 * Copyright (c) 1997, 2013, 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 "classfile/systemDictionary.hpp"
29 #include "code/exceptionHandlerTable.hpp"
30 #include "code/nmethod.hpp"
31 #include "compiler/compileLog.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "opto/addnode.hpp"
35 #include "opto/block.hpp"
36 #include "opto/c2compiler.hpp"
37 #include "opto/callGenerator.hpp"
38 #include "opto/callnode.hpp"
39 #include "opto/cfgnode.hpp"
40 #include "opto/chaitin.hpp"
41 #include "opto/compile.hpp"
42 #include "opto/connode.hpp"
43 #include "opto/divnode.hpp"
44 #include "opto/escape.hpp"
45 #include "opto/idealGraphPrinter.hpp"
46 #include "opto/loopnode.hpp"
47 #include "opto/machnode.hpp"
48 #include "opto/macro.hpp"
49 #include "opto/matcher.hpp"
50 #include "opto/mathexactnode.hpp"
51 #include "opto/memnode.hpp"
52 #include "opto/mulnode.hpp"
53 #include "opto/node.hpp"
54 #include "opto/opcodes.hpp"
55 #include "opto/output.hpp"
56 #include "opto/parse.hpp"
57 #include "opto/phaseX.hpp"
58 #include "opto/rootnode.hpp"
59 #include "opto/runtime.hpp"
60 #include "opto/stringopts.hpp"
61 #include "opto/type.hpp"
62 #include "opto/vectornode.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/signature.hpp"
65 #include "runtime/stubRoutines.hpp"
66 #include "runtime/timer.hpp"
67 #include "trace/tracing.hpp"
68 #include "utilities/copy.hpp"
69 #ifdef TARGET_ARCH_MODEL_x86_32
70 # include "adfiles/ad_x86_32.hpp"
71 #endif
72 #ifdef TARGET_ARCH_MODEL_x86_64
73 # include "adfiles/ad_x86_64.hpp"
74 #endif
75 #ifdef TARGET_ARCH_MODEL_sparc
76 # include "adfiles/ad_sparc.hpp"
77 #endif
78 #ifdef TARGET_ARCH_MODEL_zero
79 # include "adfiles/ad_zero.hpp"
80 #endif
81 #ifdef TARGET_ARCH_MODEL_arm
82 # include "adfiles/ad_arm.hpp"
83 #endif
84 #ifdef TARGET_ARCH_MODEL_ppc
85 # include "adfiles/ad_ppc.hpp"
86 #endif
87
88
89 // -------------------- Compile::mach_constant_base_node -----------------------
90 // Constant table base node singleton.
91 MachConstantBaseNode* Compile::mach_constant_base_node() {
92 if (_mach_constant_base_node == NULL) {
93 _mach_constant_base_node = new (C) MachConstantBaseNode();
94 _mach_constant_base_node->add_req(C->root());
95 }
96 return _mach_constant_base_node;
97 }
98
99
100 /// Support for intrinsics.
101
102 // Return the index at which m must be inserted (or already exists).
103 // The sort order is by the address of the ciMethod, with is_virtual as minor key.
104 int Compile::intrinsic_insertion_index(ciMethod* m, bool is_virtual) {
105 #ifdef ASSERT
106 for (int i = 1; i < _intrinsics->length(); i++) {
107 CallGenerator* cg1 = _intrinsics->at(i-1);
108 CallGenerator* cg2 = _intrinsics->at(i);
109 assert(cg1->method() != cg2->method()
110 ? cg1->method() < cg2->method()
111 : cg1->is_virtual() < cg2->is_virtual(),
112 "compiler intrinsics list must stay sorted");
113 }
114 #endif
115 // Binary search sorted list, in decreasing intervals [lo, hi].
116 int lo = 0, hi = _intrinsics->length()-1;
117 while (lo <= hi) {
118 int mid = (uint)(hi + lo) / 2;
119 ciMethod* mid_m = _intrinsics->at(mid)->method();
120 if (m < mid_m) {
121 hi = mid-1;
122 } else if (m > mid_m) {
123 lo = mid+1;
124 } else {
125 // look at minor sort key
126 bool mid_virt = _intrinsics->at(mid)->is_virtual();
127 if (is_virtual < mid_virt) {
128 hi = mid-1;
129 } else if (is_virtual > mid_virt) {
130 lo = mid+1;
131 } else {
132 return mid; // exact match
133 }
134 }
135 }
136 return lo; // inexact match
137 }
138
139 void Compile::register_intrinsic(CallGenerator* cg) {
140 if (_intrinsics == NULL) {
141 _intrinsics = new (comp_arena())GrowableArray<CallGenerator*>(comp_arena(), 60, 0, NULL);
142 }
143 // This code is stolen from ciObjectFactory::insert.
144 // Really, GrowableArray should have methods for
145 // insert_at, remove_at, and binary_search.
146 int len = _intrinsics->length();
147 int index = intrinsic_insertion_index(cg->method(), cg->is_virtual());
148 if (index == len) {
149 _intrinsics->append(cg);
150 } else {
151 #ifdef ASSERT
152 CallGenerator* oldcg = _intrinsics->at(index);
153 assert(oldcg->method() != cg->method() || oldcg->is_virtual() != cg->is_virtual(), "don't register twice");
154 #endif
155 _intrinsics->append(_intrinsics->at(len-1));
156 int pos;
157 for (pos = len-2; pos >= index; pos--) {
158 _intrinsics->at_put(pos+1,_intrinsics->at(pos));
159 }
160 _intrinsics->at_put(index, cg);
161 }
162 assert(find_intrinsic(cg->method(), cg->is_virtual()) == cg, "registration worked");
163 }
164
165 CallGenerator* Compile::find_intrinsic(ciMethod* m, bool is_virtual) {
166 assert(m->is_loaded(), "don't try this on unloaded methods");
167 if (_intrinsics != NULL) {
168 int index = intrinsic_insertion_index(m, is_virtual);
169 if (index < _intrinsics->length()
170 && _intrinsics->at(index)->method() == m
171 && _intrinsics->at(index)->is_virtual() == is_virtual) {
172 return _intrinsics->at(index);
173 }
174 }
175 // Lazily create intrinsics for intrinsic IDs well-known in the runtime.
176 if (m->intrinsic_id() != vmIntrinsics::_none &&
177 m->intrinsic_id() <= vmIntrinsics::LAST_COMPILER_INLINE) {
178 CallGenerator* cg = make_vm_intrinsic(m, is_virtual);
179 if (cg != NULL) {
180 // Save it for next time:
181 register_intrinsic(cg);
182 return cg;
183 } else {
184 gather_intrinsic_statistics(m->intrinsic_id(), is_virtual, _intrinsic_disabled);
185 }
186 }
187 return NULL;
188 }
189
190 // Compile:: register_library_intrinsics and make_vm_intrinsic are defined
191 // in library_call.cpp.
192
193
194 #ifndef PRODUCT
195 // statistics gathering...
196
197 juint Compile::_intrinsic_hist_count[vmIntrinsics::ID_LIMIT] = {0};
198 jubyte Compile::_intrinsic_hist_flags[vmIntrinsics::ID_LIMIT] = {0};
199
200 bool Compile::gather_intrinsic_statistics(vmIntrinsics::ID id, bool is_virtual, int flags) {
201 assert(id > vmIntrinsics::_none && id < vmIntrinsics::ID_LIMIT, "oob");
202 int oflags = _intrinsic_hist_flags[id];
203 assert(flags != 0, "what happened?");
204 if (is_virtual) {
205 flags |= _intrinsic_virtual;
206 }
207 bool changed = (flags != oflags);
208 if ((flags & _intrinsic_worked) != 0) {
209 juint count = (_intrinsic_hist_count[id] += 1);
210 if (count == 1) {
211 changed = true; // first time
212 }
213 // increment the overall count also:
214 _intrinsic_hist_count[vmIntrinsics::_none] += 1;
215 }
216 if (changed) {
217 if (((oflags ^ flags) & _intrinsic_virtual) != 0) {
218 // Something changed about the intrinsic's virtuality.
219 if ((flags & _intrinsic_virtual) != 0) {
220 // This is the first use of this intrinsic as a virtual call.
221 if (oflags != 0) {
222 // We already saw it as a non-virtual, so note both cases.
223 flags |= _intrinsic_both;
224 }
225 } else if ((oflags & _intrinsic_both) == 0) {
226 // This is the first use of this intrinsic as a non-virtual
227 flags |= _intrinsic_both;
228 }
229 }
230 _intrinsic_hist_flags[id] = (jubyte) (oflags | flags);
231 }
232 // update the overall flags also:
233 _intrinsic_hist_flags[vmIntrinsics::_none] |= (jubyte) flags;
234 return changed;
235 }
236
237 static char* format_flags(int flags, char* buf) {
238 buf[0] = 0;
239 if ((flags & Compile::_intrinsic_worked) != 0) strcat(buf, ",worked");
240 if ((flags & Compile::_intrinsic_failed) != 0) strcat(buf, ",failed");
241 if ((flags & Compile::_intrinsic_disabled) != 0) strcat(buf, ",disabled");
242 if ((flags & Compile::_intrinsic_virtual) != 0) strcat(buf, ",virtual");
243 if ((flags & Compile::_intrinsic_both) != 0) strcat(buf, ",nonvirtual");
244 if (buf[0] == 0) strcat(buf, ",");
245 assert(buf[0] == ',', "must be");
246 return &buf[1];
247 }
248
249 void Compile::print_intrinsic_statistics() {
250 char flagsbuf[100];
251 ttyLocker ttyl;
252 if (xtty != NULL) xtty->head("statistics type='intrinsic'");
253 tty->print_cr("Compiler intrinsic usage:");
254 juint total = _intrinsic_hist_count[vmIntrinsics::_none];
255 if (total == 0) total = 1; // avoid div0 in case of no successes
256 #define PRINT_STAT_LINE(name, c, f) \
257 tty->print_cr(" %4d (%4.1f%%) %s (%s)", (int)(c), ((c) * 100.0) / total, name, f);
258 for (int index = 1 + (int)vmIntrinsics::_none; index < (int)vmIntrinsics::ID_LIMIT; index++) {
259 vmIntrinsics::ID id = (vmIntrinsics::ID) index;
260 int flags = _intrinsic_hist_flags[id];
261 juint count = _intrinsic_hist_count[id];
262 if ((flags | count) != 0) {
263 PRINT_STAT_LINE(vmIntrinsics::name_at(id), count, format_flags(flags, flagsbuf));
264 }
265 }
266 PRINT_STAT_LINE("total", total, format_flags(_intrinsic_hist_flags[vmIntrinsics::_none], flagsbuf));
267 if (xtty != NULL) xtty->tail("statistics");
268 }
269
270 void Compile::print_statistics() {
271 { ttyLocker ttyl;
272 if (xtty != NULL) xtty->head("statistics type='opto'");
273 Parse::print_statistics();
274 PhaseCCP::print_statistics();
275 PhaseRegAlloc::print_statistics();
276 Scheduling::print_statistics();
277 PhasePeephole::print_statistics();
278 PhaseIdealLoop::print_statistics();
279 if (xtty != NULL) xtty->tail("statistics");
280 }
281 if (_intrinsic_hist_flags[vmIntrinsics::_none] != 0) {
282 // put this under its own <statistics> element.
283 print_intrinsic_statistics();
284 }
285 }
286 #endif //PRODUCT
287
288 // Support for bundling info
289 Bundle* Compile::node_bundling(const Node *n) {
290 assert(valid_bundle_info(n), "oob");
291 return &_node_bundling_base[n->_idx];
292 }
293
294 bool Compile::valid_bundle_info(const Node *n) {
295 return (_node_bundling_limit > n->_idx);
296 }
297
298
299 void Compile::gvn_replace_by(Node* n, Node* nn) {
300 for (DUIterator_Last imin, i = n->last_outs(imin); i >= imin; ) {
301 Node* use = n->last_out(i);
302 bool is_in_table = initial_gvn()->hash_delete(use);
303 uint uses_found = 0;
304 for (uint j = 0; j < use->len(); j++) {
305 if (use->in(j) == n) {
306 if (j < use->req())
307 use->set_req(j, nn);
308 else
309 use->set_prec(j, nn);
310 uses_found++;
311 }
312 }
313 if (is_in_table) {
314 // reinsert into table
315 initial_gvn()->hash_find_insert(use);
316 }
317 record_for_igvn(use);
318 i -= uses_found; // we deleted 1 or more copies of this edge
319 }
320 }
321
322
323 static inline bool not_a_node(const Node* n) {
324 if (n == NULL) return true;
325 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc.
326 if (*(address*)n == badAddress) return true; // kill by Node::destruct
327 return false;
328 }
329
330 // Identify all nodes that are reachable from below, useful.
331 // Use breadth-first pass that records state in a Unique_Node_List,
332 // recursive traversal is slower.
333 void Compile::identify_useful_nodes(Unique_Node_List &useful) {
334 int estimated_worklist_size = unique();
335 useful.map( estimated_worklist_size, NULL ); // preallocate space
336
337 // Initialize worklist
338 if (root() != NULL) { useful.push(root()); }
339 // If 'top' is cached, declare it useful to preserve cached node
340 if( cached_top_node() ) { useful.push(cached_top_node()); }
341
342 // Push all useful nodes onto the list, breadthfirst
343 for( uint next = 0; next < useful.size(); ++next ) {
344 assert( next < unique(), "Unique useful nodes < total nodes");
345 Node *n = useful.at(next);
346 uint max = n->len();
347 for( uint i = 0; i < max; ++i ) {
348 Node *m = n->in(i);
349 if (not_a_node(m)) continue;
350 useful.push(m);
351 }
352 }
353 }
354
355 // Update dead_node_list with any missing dead nodes using useful
356 // list. Consider all non-useful nodes to be useless i.e., dead nodes.
357 void Compile::update_dead_node_list(Unique_Node_List &useful) {
358 uint max_idx = unique();
359 VectorSet& useful_node_set = useful.member_set();
360
361 for (uint node_idx = 0; node_idx < max_idx; node_idx++) {
362 // If node with index node_idx is not in useful set,
363 // mark it as dead in dead node list.
364 if (! useful_node_set.test(node_idx) ) {
365 record_dead_node(node_idx);
366 }
367 }
368 }
369
370 void Compile::remove_useless_late_inlines(GrowableArray<CallGenerator*>* inlines, Unique_Node_List &useful) {
371 int shift = 0;
372 for (int i = 0; i < inlines->length(); i++) {
373 CallGenerator* cg = inlines->at(i);
374 CallNode* call = cg->call_node();
375 if (shift > 0) {
376 inlines->at_put(i-shift, cg);
377 }
378 if (!useful.member(call)) {
379 shift++;
380 }
381 }
382 inlines->trunc_to(inlines->length()-shift);
383 }
384
385 // Disconnect all useless nodes by disconnecting those at the boundary.
386 void Compile::remove_useless_nodes(Unique_Node_List &useful) {
387 uint next = 0;
388 while (next < useful.size()) {
389 Node *n = useful.at(next++);
390 // Use raw traversal of out edges since this code removes out edges
391 int max = n->outcnt();
392 for (int j = 0; j < max; ++j) {
393 Node* child = n->raw_out(j);
394 if (! useful.member(child)) {
395 assert(!child->is_top() || child != top(),
396 "If top is cached in Compile object it is in useful list");
397 // Only need to remove this out-edge to the useless node
398 n->raw_del_out(j);
399 --j;
400 --max;
401 }
402 }
403 if (n->outcnt() == 1 && n->has_special_unique_user()) {
404 record_for_igvn(n->unique_out());
405 }
406 }
407 // Remove useless macro and predicate opaq nodes
408 for (int i = C->macro_count()-1; i >= 0; i--) {
409 Node* n = C->macro_node(i);
410 if (!useful.member(n)) {
411 remove_macro_node(n);
412 }
413 }
414 // Remove useless expensive node
415 for (int i = C->expensive_count()-1; i >= 0; i--) {
416 Node* n = C->expensive_node(i);
417 if (!useful.member(n)) {
418 remove_expensive_node(n);
419 }
420 }
421 // clean up the late inline lists
422 remove_useless_late_inlines(&_string_late_inlines, useful);
423 remove_useless_late_inlines(&_boxing_late_inlines, useful);
424 remove_useless_late_inlines(&_late_inlines, useful);
425 debug_only(verify_graph_edges(true/*check for no_dead_code*/);)
426 }
427
428 //------------------------------frame_size_in_words-----------------------------
429 // frame_slots in units of words
430 int Compile::frame_size_in_words() const {
431 // shift is 0 in LP32 and 1 in LP64
432 const int shift = (LogBytesPerWord - LogBytesPerInt);
433 int words = _frame_slots >> shift;
434 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" );
435 return words;
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_type_hwm(NULL);
458 compile->set_type_last_size(0);
459 compile->set_last_tf(NULL, NULL);
460 compile->set_indexSet_arena(NULL);
461 compile->set_indexSet_free_block_list(NULL);
462 compile->init_type_arena();
463 Type::Initialize(compile);
464 _compile->set_scratch_buffer_blob(NULL);
465 _compile->begin_method();
466 }
467 CompileWrapper::~CompileWrapper() {
468 _compile->end_method();
469 if (_compile->scratch_buffer_blob() != NULL)
470 BufferBlob::free(_compile->scratch_buffer_blob());
471 _compile->env()->set_compiler_data(NULL);
472 }
473
474
475 //----------------------------print_compile_messages---------------------------
476 void Compile::print_compile_messages() {
477 #ifndef PRODUCT
478 // Check if recompiling
479 if (_subsume_loads == false && PrintOpto) {
480 // Recompiling without allowing machine instructions to subsume loads
481 tty->print_cr("*********************************************************");
482 tty->print_cr("** Bailout: Recompile without subsuming loads **");
483 tty->print_cr("*********************************************************");
484 }
485 if (_do_escape_analysis != DoEscapeAnalysis && PrintOpto) {
486 // Recompiling without escape analysis
487 tty->print_cr("*********************************************************");
488 tty->print_cr("** Bailout: Recompile without escape analysis **");
489 tty->print_cr("*********************************************************");
490 }
491 if (_eliminate_boxing != EliminateAutoBox && PrintOpto) {
492 // Recompiling without boxing elimination
493 tty->print_cr("*********************************************************");
494 tty->print_cr("** Bailout: Recompile without boxing elimination **");
495 tty->print_cr("*********************************************************");
496 }
497 if (env()->break_at_compile()) {
498 // Open the debugger when compiling this method.
499 tty->print("### Breaking when compiling: ");
500 method()->print_short_name();
501 tty->cr();
502 BREAKPOINT;
503 }
504
505 if( PrintOpto ) {
506 if (is_osr_compilation()) {
507 tty->print("[OSR]%3d", _compile_id);
508 } else {
509 tty->print("%3d", _compile_id);
510 }
511 }
512 #endif
513 }
514
515
516 //-----------------------init_scratch_buffer_blob------------------------------
517 // Construct a temporary BufferBlob and cache it for this compile.
518 void Compile::init_scratch_buffer_blob(int const_size) {
519 // If there is already a scratch buffer blob allocated and the
520 // constant section is big enough, use it. Otherwise free the
521 // current and allocate a new one.
522 BufferBlob* blob = scratch_buffer_blob();
523 if ((blob != NULL) && (const_size <= _scratch_const_size)) {
524 // Use the current blob.
525 } else {
526 if (blob != NULL) {
527 BufferBlob::free(blob);
528 }
529
530 ResourceMark rm;
531 _scratch_const_size = const_size;
532 int size = (MAX_inst_size + MAX_stubs_size + _scratch_const_size);
533 blob = BufferBlob::create("Compile::scratch_buffer", size);
534 // Record the buffer blob for next time.
535 set_scratch_buffer_blob(blob);
536 // Have we run out of code space?
537 if (scratch_buffer_blob() == NULL) {
538 // Let CompilerBroker disable further compilations.
539 record_failure("Not enough space for scratch buffer in CodeCache");
540 return;
541 }
542 }
543
544 // Initialize the relocation buffers
545 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
546 set_scratch_locs_memory(locs_buf);
547 }
548
549
550 //-----------------------scratch_emit_size-------------------------------------
551 // Helper function that computes size by emitting code
552 uint Compile::scratch_emit_size(const Node* n) {
553 // Start scratch_emit_size section.
554 set_in_scratch_emit_size(true);
555
556 // Emit into a trash buffer and count bytes emitted.
557 // This is a pretty expensive way to compute a size,
558 // but it works well enough if seldom used.
559 // All common fixed-size instructions are given a size
560 // method by the AD file.
561 // Note that the scratch buffer blob and locs memory are
562 // allocated at the beginning of the compile task, and
563 // may be shared by several calls to scratch_emit_size.
564 // The allocation of the scratch buffer blob is particularly
565 // expensive, since it has to grab the code cache lock.
566 BufferBlob* blob = this->scratch_buffer_blob();
567 assert(blob != NULL, "Initialize BufferBlob at start");
568 assert(blob->size() > MAX_inst_size, "sanity");
569 relocInfo* locs_buf = scratch_locs_memory();
570 address blob_begin = blob->content_begin();
571 address blob_end = (address)locs_buf;
572 assert(blob->content_contains(blob_end), "sanity");
573 CodeBuffer buf(blob_begin, blob_end - blob_begin);
574 buf.initialize_consts_size(_scratch_const_size);
575 buf.initialize_stubs_size(MAX_stubs_size);
576 assert(locs_buf != NULL, "sanity");
577 int lsize = MAX_locs_size / 3;
578 buf.consts()->initialize_shared_locs(&locs_buf[lsize * 0], lsize);
579 buf.insts()->initialize_shared_locs( &locs_buf[lsize * 1], lsize);
580 buf.stubs()->initialize_shared_locs( &locs_buf[lsize * 2], lsize);
581
582 // Do the emission.
583
584 Label fakeL; // Fake label for branch instructions.
585 Label* saveL = NULL;
586 uint save_bnum = 0;
587 bool is_branch = n->is_MachBranch();
588 if (is_branch) {
589 MacroAssembler masm(&buf);
590 masm.bind(fakeL);
591 n->as_MachBranch()->save_label(&saveL, &save_bnum);
592 n->as_MachBranch()->label_set(&fakeL, 0);
593 }
594 n->emit(buf, this->regalloc());
595 if (is_branch) // Restore label.
596 n->as_MachBranch()->label_set(saveL, save_bnum);
597
598 // End scratch_emit_size section.
599 set_in_scratch_emit_size(false);
600
601 return buf.insts_size();
602 }
603
604
605 // ============================================================================
606 //------------------------------Compile standard-------------------------------
607 debug_only( int Compile::_debug_idx = 100000; )
608
609 // Compile a method. entry_bci is -1 for normal compilations and indicates
610 // the continuation bci for on stack replacement.
611
612
613 Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr_bci,
614 bool subsume_loads, bool do_escape_analysis, bool eliminate_boxing )
615 : Phase(Compiler),
616 _env(ci_env),
617 _log(ci_env->log()),
618 _compile_id(ci_env->compile_id()),
619 _save_argument_registers(false),
620 _stub_name(NULL),
621 _stub_function(NULL),
622 _stub_entry_point(NULL),
623 _method(target),
624 _entry_bci(osr_bci),
625 _initial_gvn(NULL),
626 _for_igvn(NULL),
627 _warm_calls(NULL),
628 _subsume_loads(subsume_loads),
629 _do_escape_analysis(do_escape_analysis),
630 _eliminate_boxing(eliminate_boxing),
631 _failure_reason(NULL),
632 _code_buffer("Compile::Fill_buffer"),
633 _orig_pc_slot(0),
634 _orig_pc_slot_offset_in_bytes(0),
635 _has_method_handle_invokes(false),
636 _mach_constant_base_node(NULL),
637 _node_bundling_limit(0),
638 _node_bundling_base(NULL),
639 _java_calls(0),
640 _inner_loops(0),
641 _scratch_const_size(-1),
642 _in_scratch_emit_size(false),
643 _dead_node_list(comp_arena()),
644 _dead_node_count(0),
645 #ifndef PRODUCT
646 _trace_opto_output(TraceOptoOutput || method()->has_option("TraceOptoOutput")),
647 _printer(IdealGraphPrinter::printer()),
648 #endif
649 _congraph(NULL),
650 _late_inlines(comp_arena(), 2, 0, NULL),
651 _string_late_inlines(comp_arena(), 2, 0, NULL),
652 _boxing_late_inlines(comp_arena(), 2, 0, NULL),
653 _late_inlines_pos(0),
654 _number_of_mh_late_inlines(0),
655 _inlining_progress(false),
656 _inlining_incrementally(false),
657 _print_inlining_list(NULL),
658 _print_inlining_idx(0),
659 _preserve_jvm_state(0) {
660 C = this;
661
662 CompileWrapper cw(this);
663 #ifndef PRODUCT
664 if (TimeCompiler2) {
665 tty->print(" ");
666 target->holder()->name()->print();
667 tty->print(".");
668 target->print_short_name();
669 tty->print(" ");
670 }
671 TraceTime t1("Total compilation time", &_t_totalCompilation, TimeCompiler, TimeCompiler2);
672 TraceTime t2(NULL, &_t_methodCompilation, TimeCompiler, false);
673 bool print_opto_assembly = PrintOptoAssembly || _method->has_option("PrintOptoAssembly");
674 if (!print_opto_assembly) {
675 bool print_assembly = (PrintAssembly || _method->should_print_assembly());
676 if (print_assembly && !Disassembler::can_decode()) {
677 tty->print_cr("PrintAssembly request changed to PrintOptoAssembly");
678 print_opto_assembly = true;
679 }
680 }
681 set_print_assembly(print_opto_assembly);
682 set_parsed_irreducible_loop(false);
683 #endif
684 set_print_inlining(PrintInlining || method()->has_option("PrintInlining") NOT_PRODUCT( || PrintOptoInlining));
685 set_print_intrinsics(PrintIntrinsics || method()->has_option("PrintIntrinsics"));
686
687 if (ProfileTraps) {
688 // Make sure the method being compiled gets its own MDO,
689 // so we can at least track the decompile_count().
690 method()->ensure_method_data();
691 }
692
693 Init(::AliasLevel);
694
695
696 print_compile_messages();
697
698 if (UseOldInlining || PrintCompilation NOT_PRODUCT( || PrintOpto) )
699 _ilt = InlineTree::build_inline_tree_root();
700 else
701 _ilt = NULL;
702
703 // Even if NO memory addresses are used, MergeMem nodes must have at least 1 slice
704 assert(num_alias_types() >= AliasIdxRaw, "");
705
706 #define MINIMUM_NODE_HASH 1023
707 // Node list that Iterative GVN will start with
708 Unique_Node_List for_igvn(comp_arena());
709 set_for_igvn(&for_igvn);
710
711 // GVN that will be run immediately on new nodes
712 uint estimated_size = method()->code_size()*4+64;
713 estimated_size = (estimated_size < MINIMUM_NODE_HASH ? MINIMUM_NODE_HASH : estimated_size);
714 PhaseGVN gvn(node_arena(), estimated_size);
715 set_initial_gvn(&gvn);
716
717 if (print_inlining() || print_intrinsics()) {
718 _print_inlining_list = new (comp_arena())GrowableArray<PrintInliningBuffer>(comp_arena(), 1, 1, PrintInliningBuffer());
719 }
720 { // Scope for timing the parser
721 TracePhase t3("parse", &_t_parser, true);
722
723 // Put top into the hash table ASAP.
724 initial_gvn()->transform_no_reclaim(top());
725
726 // Set up tf(), start(), and find a CallGenerator.
727 CallGenerator* cg = NULL;
728 if (is_osr_compilation()) {
729 const TypeTuple *domain = StartOSRNode::osr_domain();
730 const TypeTuple *range = TypeTuple::make_range(method()->signature());
731 init_tf(TypeFunc::make(domain, range));
732 StartNode* s = new (this) StartOSRNode(root(), domain);
733 initial_gvn()->set_type_bottom(s);
734 init_start(s);
735 cg = CallGenerator::for_osr(method(), entry_bci());
736 } else {
737 // Normal case.
738 init_tf(TypeFunc::make(method()));
739 StartNode* s = new (this) StartNode(root(), tf()->domain());
740 initial_gvn()->set_type_bottom(s);
741 init_start(s);
742 if (method()->intrinsic_id() == vmIntrinsics::_Reference_get && UseG1GC) {
743 // With java.lang.ref.reference.get() we must go through the
744 // intrinsic when G1 is enabled - even when get() is the root
745 // method of the compile - so that, if necessary, the value in
746 // the referent field of the reference object gets recorded by
747 // the pre-barrier code.
748 // Specifically, if G1 is enabled, the value in the referent
749 // field is recorded by the G1 SATB pre barrier. This will
750 // result in the referent being marked live and the reference
751 // object removed from the list of discovered references during
752 // reference processing.
753 cg = find_intrinsic(method(), false);
754 }
755 if (cg == NULL) {
756 float past_uses = method()->interpreter_invocation_count();
757 float expected_uses = past_uses;
758 cg = CallGenerator::for_inline(method(), expected_uses);
759 }
760 }
761 if (failing()) return;
762 if (cg == NULL) {
763 record_method_not_compilable_all_tiers("cannot parse method");
764 return;
765 }
766 JVMState* jvms = build_start_state(start(), tf());
767 if ((jvms = cg->generate(jvms, NULL)) == NULL) {
768 record_method_not_compilable("method parse failed");
769 return;
770 }
771 GraphKit kit(jvms);
772
773 if (!kit.stopped()) {
774 // Accept return values, and transfer control we know not where.
775 // This is done by a special, unique ReturnNode bound to root.
776 return_values(kit.jvms());
777 }
778
779 if (kit.has_exceptions()) {
780 // Any exceptions that escape from this call must be rethrown
781 // to whatever caller is dynamically above us on the stack.
782 // This is done by a special, unique RethrowNode bound to root.
783 rethrow_exceptions(kit.transfer_exceptions_into_jvms());
784 }
785
786 assert(IncrementalInline || (_late_inlines.length() == 0 && !has_mh_late_inlines()), "incremental inlining is off");
787
788 if (_late_inlines.length() == 0 && !has_mh_late_inlines() && !failing() && has_stringbuilder()) {
789 inline_string_calls(true);
790 }
791
792 if (failing()) return;
793
794 print_method(PHASE_BEFORE_REMOVEUSELESS, 3);
795
796 // Remove clutter produced by parsing.
797 if (!failing()) {
798 ResourceMark rm;
799 PhaseRemoveUseless pru(initial_gvn(), &for_igvn);
800 }
801 }
802
803 // Note: Large methods are capped off in do_one_bytecode().
804 if (failing()) return;
805
806 // After parsing, node notes are no longer automagic.
807 // They must be propagated by register_new_node_with_optimizer(),
808 // clone(), or the like.
809 set_default_node_notes(NULL);
810
811 for (;;) {
812 int successes = Inline_Warm();
813 if (failing()) return;
814 if (successes == 0) break;
815 }
816
817 // Drain the list.
818 Finish_Warm();
819 #ifndef PRODUCT
820 if (_printer) {
821 _printer->print_inlining(this);
822 }
823 #endif
824
825 if (failing()) return;
826 NOT_PRODUCT( verify_graph_edges(); )
827
828 // Now optimize
829 Optimize();
830 if (failing()) return;
831 NOT_PRODUCT( verify_graph_edges(); )
832
833 #ifndef PRODUCT
834 if (PrintIdeal) {
835 ttyLocker ttyl; // keep the following output all in one block
836 // This output goes directly to the tty, not the compiler log.
837 // To enable tools to match it up with the compilation activity,
838 // be sure to tag this tty output with the compile ID.
839 if (xtty != NULL) {
840 xtty->head("ideal compile_id='%d'%s", compile_id(),
841 is_osr_compilation() ? " compile_kind='osr'" :
842 "");
843 }
844 root()->dump(9999);
845 if (xtty != NULL) {
846 xtty->tail("ideal");
847 }
848 }
849 #endif
850
851 NOT_PRODUCT( verify_barriers(); )
852 // Now that we know the size of all the monitors we can add a fixed slot
853 // for the original deopt pc.
854
855 _orig_pc_slot = fixed_slots();
856 int next_slot = _orig_pc_slot + (sizeof(address) / VMRegImpl::stack_slot_size);
857 set_fixed_slots(next_slot);
858
859 // Now generate code
860 Code_Gen();
861 if (failing()) return;
862
863 // Check if we want to skip execution of all compiled code.
864 {
865 #ifndef PRODUCT
866 if (OptoNoExecute) {
867 record_method_not_compilable("+OptoNoExecute"); // Flag as failed
868 return;
869 }
870 TracePhase t2("install_code", &_t_registerMethod, TimeCompiler);
871 #endif
872
873 if (is_osr_compilation()) {
874 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
875 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
876 } else {
877 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
878 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
879 }
880
881 env()->register_method(_method, _entry_bci,
882 &_code_offsets,
883 _orig_pc_slot_offset_in_bytes,
884 code_buffer(),
885 frame_size_in_words(), _oop_map_set,
886 &_handler_table, &_inc_table,
887 compiler,
888 env()->comp_level(),
889 has_unsafe_access(),
890 SharedRuntime::is_wide_vector(max_vector_size())
891 );
892
893 if (log() != NULL) // Print code cache state into compiler log
894 log()->code_cache_state();
895 }
896 }
897
898 //------------------------------Compile----------------------------------------
899 // Compile a runtime stub
900 Compile::Compile( ciEnv* ci_env,
901 TypeFunc_generator generator,
902 address stub_function,
903 const char *stub_name,
904 int is_fancy_jump,
905 bool pass_tls,
906 bool save_arg_registers,
907 bool return_pc )
908 : Phase(Compiler),
909 _env(ci_env),
910 _log(ci_env->log()),
911 _compile_id(0),
912 _save_argument_registers(save_arg_registers),
913 _method(NULL),
914 _stub_name(stub_name),
915 _stub_function(stub_function),
916 _stub_entry_point(NULL),
917 _entry_bci(InvocationEntryBci),
918 _initial_gvn(NULL),
919 _for_igvn(NULL),
920 _warm_calls(NULL),
921 _orig_pc_slot(0),
922 _orig_pc_slot_offset_in_bytes(0),
923 _subsume_loads(true),
924 _do_escape_analysis(false),
925 _eliminate_boxing(false),
926 _failure_reason(NULL),
927 _code_buffer("Compile::Fill_buffer"),
928 _has_method_handle_invokes(false),
929 _mach_constant_base_node(NULL),
930 _node_bundling_limit(0),
931 _node_bundling_base(NULL),
932 _java_calls(0),
933 _inner_loops(0),
934 #ifndef PRODUCT
935 _trace_opto_output(TraceOptoOutput),
936 _printer(NULL),
937 #endif
938 _dead_node_list(comp_arena()),
939 _dead_node_count(0),
940 _congraph(NULL),
941 _number_of_mh_late_inlines(0),
942 _inlining_progress(false),
943 _inlining_incrementally(false),
944 _print_inlining_list(NULL),
945 _print_inlining_idx(0),
946 _preserve_jvm_state(0) {
947 C = this;
948
949 #ifndef PRODUCT
950 TraceTime t1(NULL, &_t_totalCompilation, TimeCompiler, false);
951 TraceTime t2(NULL, &_t_stubCompilation, TimeCompiler, false);
952 set_print_assembly(PrintFrameConverterAssembly);
953 set_parsed_irreducible_loop(false);
954 #endif
955 CompileWrapper cw(this);
956 Init(/*AliasLevel=*/ 0);
957 init_tf((*generator)());
958
959 {
960 // The following is a dummy for the sake of GraphKit::gen_stub
961 Unique_Node_List for_igvn(comp_arena());
962 set_for_igvn(&for_igvn); // not used, but some GraphKit guys push on this
963 PhaseGVN gvn(Thread::current()->resource_area(),255);
964 set_initial_gvn(&gvn); // not significant, but GraphKit guys use it pervasively
965 gvn.transform_no_reclaim(top());
966
967 GraphKit kit;
968 kit.gen_stub(stub_function, stub_name, is_fancy_jump, pass_tls, return_pc);
969 }
970
971 NOT_PRODUCT( verify_graph_edges(); )
972 Code_Gen();
973 if (failing()) return;
974
975
976 // Entry point will be accessed using compile->stub_entry_point();
977 if (code_buffer() == NULL) {
978 Matcher::soft_match_failure();
979 } else {
980 if (PrintAssembly && (WizardMode || Verbose))
981 tty->print_cr("### Stub::%s", stub_name);
982
983 if (!failing()) {
984 assert(_fixed_slots == 0, "no fixed slots used for runtime stubs");
985
986 // Make the NMethod
987 // For now we mark the frame as never safe for profile stackwalking
988 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
989 code_buffer(),
990 CodeOffsets::frame_never_safe,
991 // _code_offsets.value(CodeOffsets::Frame_Complete),
992 frame_size_in_words(),
993 _oop_map_set,
994 save_arg_registers);
995 assert(rs != NULL && rs->is_runtime_stub(), "sanity check");
996
997 _stub_entry_point = rs->entry_point();
998 }
999 }
1000 }
1001
1002 //------------------------------Init-------------------------------------------
1003 // Prepare for a single compilation
1004 void Compile::Init(int aliaslevel) {
1005 _unique = 0;
1006 _regalloc = NULL;
1007
1008 _tf = NULL; // filled in later
1009 _top = NULL; // cached later
1010 _matcher = NULL; // filled in later
1011 _cfg = NULL; // filled in later
1012
1013 set_24_bit_selection_and_mode(Use24BitFP, false);
1014
1015 _node_note_array = NULL;
1016 _default_node_notes = NULL;
1017
1018 _immutable_memory = NULL; // filled in at first inquiry
1019
1020 // Globally visible Nodes
1021 // First set TOP to NULL to give safe behavior during creation of RootNode
1022 set_cached_top_node(NULL);
1023 set_root(new (this) RootNode());
1024 // Now that you have a Root to point to, create the real TOP
1025 set_cached_top_node( new (this) ConNode(Type::TOP) );
1026 set_recent_alloc(NULL, NULL);
1027
1028 // Create Debug Information Recorder to record scopes, oopmaps, etc.
1029 env()->set_oop_recorder(new OopRecorder(env()->arena()));
1030 env()->set_debug_info(new DebugInformationRecorder(env()->oop_recorder()));
1031 env()->set_dependencies(new Dependencies(env()));
1032
1033 _fixed_slots = 0;
1034 set_has_split_ifs(false);
1035 set_has_loops(has_method() && method()->has_loops()); // first approximation
1036 set_has_stringbuilder(false);
1037 set_has_boxed_value(false);
1038 _trap_can_recompile = false; // no traps emitted yet
1039 _major_progress = true; // start out assuming good things will happen
1040 set_has_unsafe_access(false);
1041 set_max_vector_size(0);
1042 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist));
1043 set_decompile_count(0);
1044
1045 set_do_freq_based_layout(BlockLayoutByFrequency || method_has_option("BlockLayoutByFrequency"));
1046 set_num_loop_opts(LoopOptsCount);
1047 set_do_inlining(Inline);
1048 set_max_inline_size(MaxInlineSize);
1049 set_freq_inline_size(FreqInlineSize);
1050 set_do_scheduling(OptoScheduling);
1051 set_do_count_invocations(false);
1052 set_do_method_data_update(false);
1053
1054 if (debug_info()->recording_non_safepoints()) {
1055 set_node_note_array(new(comp_arena()) GrowableArray<Node_Notes*>
1056 (comp_arena(), 8, 0, NULL));
1057 set_default_node_notes(Node_Notes::make(this));
1058 }
1059
1060 // // -- Initialize types before each compile --
1061 // // Update cached type information
1062 // if( _method && _method->constants() )
1063 // Type::update_loaded_types(_method, _method->constants());
1064
1065 // Init alias_type map.
1066 if (!_do_escape_analysis && aliaslevel == 3)
1067 aliaslevel = 2; // No unique types without escape analysis
1068 _AliasLevel = aliaslevel;
1069 const int grow_ats = 16;
1070 _max_alias_types = grow_ats;
1071 _alias_types = NEW_ARENA_ARRAY(comp_arena(), AliasType*, grow_ats);
1072 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, grow_ats);
1073 Copy::zero_to_bytes(ats, sizeof(AliasType)*grow_ats);
1074 {
1075 for (int i = 0; i < grow_ats; i++) _alias_types[i] = &ats[i];
1076 }
1077 // Initialize the first few types.
1078 _alias_types[AliasIdxTop]->Init(AliasIdxTop, NULL);
1079 _alias_types[AliasIdxBot]->Init(AliasIdxBot, TypePtr::BOTTOM);
1080 _alias_types[AliasIdxRaw]->Init(AliasIdxRaw, TypeRawPtr::BOTTOM);
1081 _num_alias_types = AliasIdxRaw+1;
1082 // Zero out the alias type cache.
1083 Copy::zero_to_bytes(_alias_cache, sizeof(_alias_cache));
1084 // A NULL adr_type hits in the cache right away. Preload the right answer.
1085 probe_alias_cache(NULL)->_index = AliasIdxTop;
1086
1087 _intrinsics = NULL;
1088 _macro_nodes = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1089 _predicate_opaqs = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1090 _expensive_nodes = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1091 register_library_intrinsics();
1092 }
1093
1094 //---------------------------init_start----------------------------------------
1095 // Install the StartNode on this compile object.
1096 void Compile::init_start(StartNode* s) {
1097 if (failing())
1098 return; // already failing
1099 assert(s == start(), "");
1100 }
1101
1102 StartNode* Compile::start() const {
1103 assert(!failing(), "");
1104 for (DUIterator_Fast imax, i = root()->fast_outs(imax); i < imax; i++) {
1105 Node* start = root()->fast_out(i);
1106 if( start->is_Start() )
1107 return start->as_Start();
1108 }
1109 ShouldNotReachHere();
1110 return NULL;
1111 }
1112
1113 //-------------------------------immutable_memory-------------------------------------
1114 // Access immutable memory
1115 Node* Compile::immutable_memory() {
1116 if (_immutable_memory != NULL) {
1117 return _immutable_memory;
1118 }
1119 StartNode* s = start();
1120 for (DUIterator_Fast imax, i = s->fast_outs(imax); true; i++) {
1121 Node *p = s->fast_out(i);
1122 if (p != s && p->as_Proj()->_con == TypeFunc::Memory) {
1123 _immutable_memory = p;
1124 return _immutable_memory;
1125 }
1126 }
1127 ShouldNotReachHere();
1128 return NULL;
1129 }
1130
1131 //----------------------set_cached_top_node------------------------------------
1132 // Install the cached top node, and make sure Node::is_top works correctly.
1133 void Compile::set_cached_top_node(Node* tn) {
1134 if (tn != NULL) verify_top(tn);
1135 Node* old_top = _top;
1136 _top = tn;
1137 // Calling Node::setup_is_top allows the nodes the chance to adjust
1138 // their _out arrays.
1139 if (_top != NULL) _top->setup_is_top();
1140 if (old_top != NULL) old_top->setup_is_top();
1141 assert(_top == NULL || top()->is_top(), "");
1142 }
1143
1144 #ifdef ASSERT
1145 uint Compile::count_live_nodes_by_graph_walk() {
1146 Unique_Node_List useful(comp_arena());
1147 // Get useful node list by walking the graph.
1148 identify_useful_nodes(useful);
1149 return useful.size();
1150 }
1151
1152 void Compile::print_missing_nodes() {
1153
1154 // Return if CompileLog is NULL and PrintIdealNodeCount is false.
1155 if ((_log == NULL) && (! PrintIdealNodeCount)) {
1156 return;
1157 }
1158
1159 // This is an expensive function. It is executed only when the user
1160 // specifies VerifyIdealNodeCount option or otherwise knows the
1161 // additional work that needs to be done to identify reachable nodes
1162 // by walking the flow graph and find the missing ones using
1163 // _dead_node_list.
1164
1165 Unique_Node_List useful(comp_arena());
1166 // Get useful node list by walking the graph.
1167 identify_useful_nodes(useful);
1168
1169 uint l_nodes = C->live_nodes();
1170 uint l_nodes_by_walk = useful.size();
1171
1172 if (l_nodes != l_nodes_by_walk) {
1173 if (_log != NULL) {
1174 _log->begin_head("mismatched_nodes count='%d'", abs((int) (l_nodes - l_nodes_by_walk)));
1175 _log->stamp();
1176 _log->end_head();
1177 }
1178 VectorSet& useful_member_set = useful.member_set();
1179 int last_idx = l_nodes_by_walk;
1180 for (int i = 0; i < last_idx; i++) {
1181 if (useful_member_set.test(i)) {
1182 if (_dead_node_list.test(i)) {
1183 if (_log != NULL) {
1184 _log->elem("mismatched_node_info node_idx='%d' type='both live and dead'", i);
1185 }
1186 if (PrintIdealNodeCount) {
1187 // Print the log message to tty
1188 tty->print_cr("mismatched_node idx='%d' both live and dead'", i);
1189 useful.at(i)->dump();
1190 }
1191 }
1192 }
1193 else if (! _dead_node_list.test(i)) {
1194 if (_log != NULL) {
1195 _log->elem("mismatched_node_info node_idx='%d' type='neither live nor dead'", i);
1196 }
1197 if (PrintIdealNodeCount) {
1198 // Print the log message to tty
1199 tty->print_cr("mismatched_node idx='%d' type='neither live nor dead'", i);
1200 }
1201 }
1202 }
1203 if (_log != NULL) {
1204 _log->tail("mismatched_nodes");
1205 }
1206 }
1207 }
1208 #endif
1209
1210 #ifndef PRODUCT
1211 void Compile::verify_top(Node* tn) const {
1212 if (tn != NULL) {
1213 assert(tn->is_Con(), "top node must be a constant");
1214 assert(((ConNode*)tn)->type() == Type::TOP, "top node must have correct type");
1215 assert(tn->in(0) != NULL, "must have live top node");
1216 }
1217 }
1218 #endif
1219
1220
1221 ///-------------------Managing Per-Node Debug & Profile Info-------------------
1222
1223 void Compile::grow_node_notes(GrowableArray<Node_Notes*>* arr, int grow_by) {
1224 guarantee(arr != NULL, "");
1225 int num_blocks = arr->length();
1226 if (grow_by < num_blocks) grow_by = num_blocks;
1227 int num_notes = grow_by * _node_notes_block_size;
1228 Node_Notes* notes = NEW_ARENA_ARRAY(node_arena(), Node_Notes, num_notes);
1229 Copy::zero_to_bytes(notes, num_notes * sizeof(Node_Notes));
1230 while (num_notes > 0) {
1231 arr->append(notes);
1232 notes += _node_notes_block_size;
1233 num_notes -= _node_notes_block_size;
1234 }
1235 assert(num_notes == 0, "exact multiple, please");
1236 }
1237
1238 bool Compile::copy_node_notes_to(Node* dest, Node* source) {
1239 if (source == NULL || dest == NULL) return false;
1240
1241 if (dest->is_Con())
1242 return false; // Do not push debug info onto constants.
1243
1244 #ifdef ASSERT
1245 // Leave a bread crumb trail pointing to the original node:
1246 if (dest != NULL && dest != source && dest->debug_orig() == NULL) {
1247 dest->set_debug_orig(source);
1248 }
1249 #endif
1250
1251 if (node_note_array() == NULL)
1252 return false; // Not collecting any notes now.
1253
1254 // This is a copy onto a pre-existing node, which may already have notes.
1255 // If both nodes have notes, do not overwrite any pre-existing notes.
1256 Node_Notes* source_notes = node_notes_at(source->_idx);
1257 if (source_notes == NULL || source_notes->is_clear()) return false;
1258 Node_Notes* dest_notes = node_notes_at(dest->_idx);
1259 if (dest_notes == NULL || dest_notes->is_clear()) {
1260 return set_node_notes_at(dest->_idx, source_notes);
1261 }
1262
1263 Node_Notes merged_notes = (*source_notes);
1264 // The order of operations here ensures that dest notes will win...
1265 merged_notes.update_from(dest_notes);
1266 return set_node_notes_at(dest->_idx, &merged_notes);
1267 }
1268
1269
1270 //--------------------------allow_range_check_smearing-------------------------
1271 // Gating condition for coalescing similar range checks.
1272 // Sometimes we try 'speculatively' replacing a series of a range checks by a
1273 // single covering check that is at least as strong as any of them.
1274 // If the optimization succeeds, the simplified (strengthened) range check
1275 // will always succeed. If it fails, we will deopt, and then give up
1276 // on the optimization.
1277 bool Compile::allow_range_check_smearing() const {
1278 // If this method has already thrown a range-check,
1279 // assume it was because we already tried range smearing
1280 // and it failed.
1281 uint already_trapped = trap_count(Deoptimization::Reason_range_check);
1282 return !already_trapped;
1283 }
1284
1285
1286 //------------------------------flatten_alias_type-----------------------------
1287 const TypePtr *Compile::flatten_alias_type( const TypePtr *tj ) const {
1288 int offset = tj->offset();
1289 TypePtr::PTR ptr = tj->ptr();
1290
1291 // Known instance (scalarizable allocation) alias only with itself.
1292 bool is_known_inst = tj->isa_oopptr() != NULL &&
1293 tj->is_oopptr()->is_known_instance();
1294
1295 // Process weird unsafe references.
1296 if (offset == Type::OffsetBot && (tj->isa_instptr() /*|| tj->isa_klassptr()*/)) {
1297 assert(InlineUnsafeOps, "indeterminate pointers come only from unsafe ops");
1298 assert(!is_known_inst, "scalarizable allocation should not have unsafe references");
1299 tj = TypeOopPtr::BOTTOM;
1300 ptr = tj->ptr();
1301 offset = tj->offset();
1302 }
1303
1304 // Array pointers need some flattening
1305 const TypeAryPtr *ta = tj->isa_aryptr();
1306 if (ta && ta->is_stable()) {
1307 // Erase stability property for alias analysis.
1308 tj = ta = ta->cast_to_stable(false);
1309 }
1310 if( ta && is_known_inst ) {
1311 if ( offset != Type::OffsetBot &&
1312 offset > arrayOopDesc::length_offset_in_bytes() ) {
1313 offset = Type::OffsetBot; // Flatten constant access into array body only
1314 tj = ta = TypeAryPtr::make(ptr, ta->ary(), ta->klass(), true, offset, ta->instance_id());
1315 }
1316 } else if( ta && _AliasLevel >= 2 ) {
1317 // For arrays indexed by constant indices, we flatten the alias
1318 // space to include all of the array body. Only the header, klass
1319 // and array length can be accessed un-aliased.
1320 if( offset != Type::OffsetBot ) {
1321 if( ta->const_oop() ) { // MethodData* or Method*
1322 offset = Type::OffsetBot; // Flatten constant access into array body
1323 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),ta->ary(),ta->klass(),false,offset);
1324 } else if( offset == arrayOopDesc::length_offset_in_bytes() ) {
1325 // range is OK as-is.
1326 tj = ta = TypeAryPtr::RANGE;
1327 } else if( offset == oopDesc::klass_offset_in_bytes() ) {
1328 tj = TypeInstPtr::KLASS; // all klass loads look alike
1329 ta = TypeAryPtr::RANGE; // generic ignored junk
1330 ptr = TypePtr::BotPTR;
1331 } else if( offset == oopDesc::mark_offset_in_bytes() ) {
1332 tj = TypeInstPtr::MARK;
1333 ta = TypeAryPtr::RANGE; // generic ignored junk
1334 ptr = TypePtr::BotPTR;
1335 } else { // Random constant offset into array body
1336 offset = Type::OffsetBot; // Flatten constant access into array body
1337 tj = ta = TypeAryPtr::make(ptr,ta->ary(),ta->klass(),false,offset);
1338 }
1339 }
1340 // Arrays of fixed size alias with arrays of unknown size.
1341 if (ta->size() != TypeInt::POS) {
1342 const TypeAry *tary = TypeAry::make(ta->elem(), TypeInt::POS);
1343 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,ta->klass(),false,offset);
1344 }
1345 // Arrays of known objects become arrays of unknown objects.
1346 if (ta->elem()->isa_narrowoop() && ta->elem() != TypeNarrowOop::BOTTOM) {
1347 const TypeAry *tary = TypeAry::make(TypeNarrowOop::BOTTOM, ta->size());
1348 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,offset);
1349 }
1350 if (ta->elem()->isa_oopptr() && ta->elem() != TypeInstPtr::BOTTOM) {
1351 const TypeAry *tary = TypeAry::make(TypeInstPtr::BOTTOM, ta->size());
1352 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,offset);
1353 }
1354 // Arrays of bytes and of booleans both use 'bastore' and 'baload' so
1355 // cannot be distinguished by bytecode alone.
1356 if (ta->elem() == TypeInt::BOOL) {
1357 const TypeAry *tary = TypeAry::make(TypeInt::BYTE, ta->size());
1358 ciKlass* aklass = ciTypeArrayKlass::make(T_BYTE);
1359 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,aklass,false,offset);
1360 }
1361 // During the 2nd round of IterGVN, NotNull castings are removed.
1362 // Make sure the Bottom and NotNull variants alias the same.
1363 // Also, make sure exact and non-exact variants alias the same.
1364 if (ptr == TypePtr::NotNull || ta->klass_is_exact() || ta->speculative() != NULL) {
1365 tj = ta = TypeAryPtr::make(TypePtr::BotPTR,ta->ary(),ta->klass(),false,offset);
1366 }
1367 }
1368
1369 // Oop pointers need some flattening
1370 const TypeInstPtr *to = tj->isa_instptr();
1371 if( to && _AliasLevel >= 2 && to != TypeOopPtr::BOTTOM ) {
1372 ciInstanceKlass *k = to->klass()->as_instance_klass();
1373 if( ptr == TypePtr::Constant ) {
1374 if (to->klass() != ciEnv::current()->Class_klass() ||
1375 offset < k->size_helper() * wordSize) {
1376 // No constant oop pointers (such as Strings); they alias with
1377 // unknown strings.
1378 assert(!is_known_inst, "not scalarizable allocation");
1379 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset);
1380 }
1381 } else if( is_known_inst ) {
1382 tj = to; // Keep NotNull and klass_is_exact for instance type
1383 } else if( ptr == TypePtr::NotNull || to->klass_is_exact() ) {
1384 // During the 2nd round of IterGVN, NotNull castings are removed.
1385 // Make sure the Bottom and NotNull variants alias the same.
1386 // Also, make sure exact and non-exact variants alias the same.
1387 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset);
1388 }
1389 if (to->speculative() != NULL) {
1390 tj = to = TypeInstPtr::make(to->ptr(),to->klass(),to->klass_is_exact(),to->const_oop(),to->offset(), to->instance_id());
1391 }
1392 // Canonicalize the holder of this field
1393 if (offset >= 0 && offset < instanceOopDesc::base_offset_in_bytes()) {
1394 // First handle header references such as a LoadKlassNode, even if the
1395 // object's klass is unloaded at compile time (4965979).
1396 if (!is_known_inst) { // Do it only for non-instance types
1397 tj = to = TypeInstPtr::make(TypePtr::BotPTR, env()->Object_klass(), false, NULL, offset);
1398 }
1399 } else if (offset < 0 || offset >= k->size_helper() * wordSize) {
1400 // Static fields are in the space above the normal instance
1401 // fields in the java.lang.Class instance.
1402 if (to->klass() != ciEnv::current()->Class_klass()) {
1403 to = NULL;
1404 tj = TypeOopPtr::BOTTOM;
1405 offset = tj->offset();
1406 }
1407 } else {
1408 ciInstanceKlass *canonical_holder = k->get_canonical_holder(offset);
1409 if (!k->equals(canonical_holder) || tj->offset() != offset) {
1410 if( is_known_inst ) {
1411 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, true, NULL, offset, to->instance_id());
1412 } else {
1413 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, false, NULL, offset);
1414 }
1415 }
1416 }
1417 }
1418
1419 // Klass pointers to object array klasses need some flattening
1420 const TypeKlassPtr *tk = tj->isa_klassptr();
1421 if( tk ) {
1422 // If we are referencing a field within a Klass, we need
1423 // to assume the worst case of an Object. Both exact and
1424 // inexact types must flatten to the same alias class so
1425 // use NotNull as the PTR.
1426 if ( offset == Type::OffsetBot || (offset >= 0 && (size_t)offset < sizeof(Klass)) ) {
1427
1428 tj = tk = TypeKlassPtr::make(TypePtr::NotNull,
1429 TypeKlassPtr::OBJECT->klass(),
1430 offset);
1431 }
1432
1433 ciKlass* klass = tk->klass();
1434 if( klass->is_obj_array_klass() ) {
1435 ciKlass* k = TypeAryPtr::OOPS->klass();
1436 if( !k || !k->is_loaded() ) // Only fails for some -Xcomp runs
1437 k = TypeInstPtr::BOTTOM->klass();
1438 tj = tk = TypeKlassPtr::make( TypePtr::NotNull, k, offset );
1439 }
1440
1441 // Check for precise loads from the primary supertype array and force them
1442 // to the supertype cache alias index. Check for generic array loads from
1443 // the primary supertype array and also force them to the supertype cache
1444 // alias index. Since the same load can reach both, we need to merge
1445 // these 2 disparate memories into the same alias class. Since the
1446 // primary supertype array is read-only, there's no chance of confusion
1447 // where we bypass an array load and an array store.
1448 int primary_supers_offset = in_bytes(Klass::primary_supers_offset());
1449 if (offset == Type::OffsetBot ||
1450 (offset >= primary_supers_offset &&
1451 offset < (int)(primary_supers_offset + Klass::primary_super_limit() * wordSize)) ||
1452 offset == (int)in_bytes(Klass::secondary_super_cache_offset())) {
1453 offset = in_bytes(Klass::secondary_super_cache_offset());
1454 tj = tk = TypeKlassPtr::make( TypePtr::NotNull, tk->klass(), offset );
1455 }
1456 }
1457
1458 // Flatten all Raw pointers together.
1459 if (tj->base() == Type::RawPtr)
1460 tj = TypeRawPtr::BOTTOM;
1461
1462 if (tj->base() == Type::AnyPtr)
1463 tj = TypePtr::BOTTOM; // An error, which the caller must check for.
1464
1465 // Flatten all to bottom for now
1466 switch( _AliasLevel ) {
1467 case 0:
1468 tj = TypePtr::BOTTOM;
1469 break;
1470 case 1: // Flatten to: oop, static, field or array
1471 switch (tj->base()) {
1472 //case Type::AryPtr: tj = TypeAryPtr::RANGE; break;
1473 case Type::RawPtr: tj = TypeRawPtr::BOTTOM; break;
1474 case Type::AryPtr: // do not distinguish arrays at all
1475 case Type::InstPtr: tj = TypeInstPtr::BOTTOM; break;
1476 case Type::KlassPtr: tj = TypeKlassPtr::OBJECT; break;
1477 case Type::AnyPtr: tj = TypePtr::BOTTOM; break; // caller checks it
1478 default: ShouldNotReachHere();
1479 }
1480 break;
1481 case 2: // No collapsing at level 2; keep all splits
1482 case 3: // No collapsing at level 3; keep all splits
1483 break;
1484 default:
1485 Unimplemented();
1486 }
1487
1488 offset = tj->offset();
1489 assert( offset != Type::OffsetTop, "Offset has fallen from constant" );
1490
1491 assert( (offset != Type::OffsetBot && tj->base() != Type::AryPtr) ||
1492 (offset == Type::OffsetBot && tj->base() == Type::AryPtr) ||
1493 (offset == Type::OffsetBot && tj == TypeOopPtr::BOTTOM) ||
1494 (offset == Type::OffsetBot && tj == TypePtr::BOTTOM) ||
1495 (offset == oopDesc::mark_offset_in_bytes() && tj->base() == Type::AryPtr) ||
1496 (offset == oopDesc::klass_offset_in_bytes() && tj->base() == Type::AryPtr) ||
1497 (offset == arrayOopDesc::length_offset_in_bytes() && tj->base() == Type::AryPtr) ,
1498 "For oops, klasses, raw offset must be constant; for arrays the offset is never known" );
1499 assert( tj->ptr() != TypePtr::TopPTR &&
1500 tj->ptr() != TypePtr::AnyNull &&
1501 tj->ptr() != TypePtr::Null, "No imprecise addresses" );
1502 // assert( tj->ptr() != TypePtr::Constant ||
1503 // tj->base() == Type::RawPtr ||
1504 // tj->base() == Type::KlassPtr, "No constant oop addresses" );
1505
1506 return tj;
1507 }
1508
1509 void Compile::AliasType::Init(int i, const TypePtr* at) {
1510 _index = i;
1511 _adr_type = at;
1512 _field = NULL;
1513 _element = NULL;
1514 _is_rewritable = true; // default
1515 const TypeOopPtr *atoop = (at != NULL) ? at->isa_oopptr() : NULL;
1516 if (atoop != NULL && atoop->is_known_instance()) {
1517 const TypeOopPtr *gt = atoop->cast_to_instance_id(TypeOopPtr::InstanceBot);
1518 _general_index = Compile::current()->get_alias_index(gt);
1519 } else {
1520 _general_index = 0;
1521 }
1522 }
1523
1524 //---------------------------------print_on------------------------------------
1525 #ifndef PRODUCT
1526 void Compile::AliasType::print_on(outputStream* st) {
1527 if (index() < 10)
1528 st->print("@ <%d> ", index());
1529 else st->print("@ <%d>", index());
1530 st->print(is_rewritable() ? " " : " RO");
1531 int offset = adr_type()->offset();
1532 if (offset == Type::OffsetBot)
1533 st->print(" +any");
1534 else st->print(" +%-3d", offset);
1535 st->print(" in ");
1536 adr_type()->dump_on(st);
1537 const TypeOopPtr* tjp = adr_type()->isa_oopptr();
1538 if (field() != NULL && tjp) {
1539 if (tjp->klass() != field()->holder() ||
1540 tjp->offset() != field()->offset_in_bytes()) {
1541 st->print(" != ");
1542 field()->print();
1543 st->print(" ***");
1544 }
1545 }
1546 }
1547
1548 void print_alias_types() {
1549 Compile* C = Compile::current();
1550 tty->print_cr("--- Alias types, AliasIdxBot .. %d", C->num_alias_types()-1);
1551 for (int idx = Compile::AliasIdxBot; idx < C->num_alias_types(); idx++) {
1552 C->alias_type(idx)->print_on(tty);
1553 tty->cr();
1554 }
1555 }
1556 #endif
1557
1558
1559 //----------------------------probe_alias_cache--------------------------------
1560 Compile::AliasCacheEntry* Compile::probe_alias_cache(const TypePtr* adr_type) {
1561 intptr_t key = (intptr_t) adr_type;
1562 key ^= key >> logAliasCacheSize;
1563 return &_alias_cache[key & right_n_bits(logAliasCacheSize)];
1564 }
1565
1566
1567 //-----------------------------grow_alias_types--------------------------------
1568 void Compile::grow_alias_types() {
1569 const int old_ats = _max_alias_types; // how many before?
1570 const int new_ats = old_ats; // how many more?
1571 const int grow_ats = old_ats+new_ats; // how many now?
1572 _max_alias_types = grow_ats;
1573 _alias_types = REALLOC_ARENA_ARRAY(comp_arena(), AliasType*, _alias_types, old_ats, grow_ats);
1574 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, new_ats);
1575 Copy::zero_to_bytes(ats, sizeof(AliasType)*new_ats);
1576 for (int i = 0; i < new_ats; i++) _alias_types[old_ats+i] = &ats[i];
1577 }
1578
1579
1580 //--------------------------------find_alias_type------------------------------
1581 Compile::AliasType* Compile::find_alias_type(const TypePtr* adr_type, bool no_create, ciField* original_field) {
1582 if (_AliasLevel == 0)
1583 return alias_type(AliasIdxBot);
1584
1585 AliasCacheEntry* ace = probe_alias_cache(adr_type);
1586 if (ace->_adr_type == adr_type) {
1587 return alias_type(ace->_index);
1588 }
1589
1590 // Handle special cases.
1591 if (adr_type == NULL) return alias_type(AliasIdxTop);
1592 if (adr_type == TypePtr::BOTTOM) return alias_type(AliasIdxBot);
1593
1594 // Do it the slow way.
1595 const TypePtr* flat = flatten_alias_type(adr_type);
1596
1597 #ifdef ASSERT
1598 assert(flat == flatten_alias_type(flat), "idempotent");
1599 assert(flat != TypePtr::BOTTOM, "cannot alias-analyze an untyped ptr");
1600 if (flat->isa_oopptr() && !flat->isa_klassptr()) {
1601 const TypeOopPtr* foop = flat->is_oopptr();
1602 // Scalarizable allocations have exact klass always.
1603 bool exact = !foop->klass_is_exact() || foop->is_known_instance();
1604 const TypePtr* xoop = foop->cast_to_exactness(exact)->is_ptr();
1605 assert(foop == flatten_alias_type(xoop), "exactness must not affect alias type");
1606 }
1607 assert(flat == flatten_alias_type(flat), "exact bit doesn't matter");
1608 #endif
1609
1610 int idx = AliasIdxTop;
1611 for (int i = 0; i < num_alias_types(); i++) {
1612 if (alias_type(i)->adr_type() == flat) {
1613 idx = i;
1614 break;
1615 }
1616 }
1617
1618 if (idx == AliasIdxTop) {
1619 if (no_create) return NULL;
1620 // Grow the array if necessary.
1621 if (_num_alias_types == _max_alias_types) grow_alias_types();
1622 // Add a new alias type.
1623 idx = _num_alias_types++;
1624 _alias_types[idx]->Init(idx, flat);
1625 if (flat == TypeInstPtr::KLASS) alias_type(idx)->set_rewritable(false);
1626 if (flat == TypeAryPtr::RANGE) alias_type(idx)->set_rewritable(false);
1627 if (flat->isa_instptr()) {
1628 if (flat->offset() == java_lang_Class::klass_offset_in_bytes()
1629 && flat->is_instptr()->klass() == env()->Class_klass())
1630 alias_type(idx)->set_rewritable(false);
1631 }
1632 if (flat->isa_aryptr()) {
1633 #ifdef ASSERT
1634 const int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1635 // (T_BYTE has the weakest alignment and size restrictions...)
1636 assert(flat->offset() < header_size_min, "array body reference must be OffsetBot");
1637 #endif
1638 if (flat->offset() == TypePtr::OffsetBot) {
1639 alias_type(idx)->set_element(flat->is_aryptr()->elem());
1640 }
1641 }
1642 if (flat->isa_klassptr()) {
1643 if (flat->offset() == in_bytes(Klass::super_check_offset_offset()))
1644 alias_type(idx)->set_rewritable(false);
1645 if (flat->offset() == in_bytes(Klass::modifier_flags_offset()))
1646 alias_type(idx)->set_rewritable(false);
1647 if (flat->offset() == in_bytes(Klass::access_flags_offset()))
1648 alias_type(idx)->set_rewritable(false);
1649 if (flat->offset() == in_bytes(Klass::java_mirror_offset()))
1650 alias_type(idx)->set_rewritable(false);
1651 }
1652 // %%% (We would like to finalize JavaThread::threadObj_offset(),
1653 // but the base pointer type is not distinctive enough to identify
1654 // references into JavaThread.)
1655
1656 // Check for final fields.
1657 const TypeInstPtr* tinst = flat->isa_instptr();
1658 if (tinst && tinst->offset() >= instanceOopDesc::base_offset_in_bytes()) {
1659 ciField* field;
1660 if (tinst->const_oop() != NULL &&
1661 tinst->klass() == ciEnv::current()->Class_klass() &&
1662 tinst->offset() >= (tinst->klass()->as_instance_klass()->size_helper() * wordSize)) {
1663 // static field
1664 ciInstanceKlass* k = tinst->const_oop()->as_instance()->java_lang_Class_klass()->as_instance_klass();
1665 field = k->get_field_by_offset(tinst->offset(), true);
1666 } else {
1667 ciInstanceKlass *k = tinst->klass()->as_instance_klass();
1668 field = k->get_field_by_offset(tinst->offset(), false);
1669 }
1670 assert(field == NULL ||
1671 original_field == NULL ||
1672 (field->holder() == original_field->holder() &&
1673 field->offset() == original_field->offset() &&
1674 field->is_static() == original_field->is_static()), "wrong field?");
1675 // Set field() and is_rewritable() attributes.
1676 if (field != NULL) alias_type(idx)->set_field(field);
1677 }
1678 }
1679
1680 // Fill the cache for next time.
1681 ace->_adr_type = adr_type;
1682 ace->_index = idx;
1683 assert(alias_type(adr_type) == alias_type(idx), "type must be installed");
1684
1685 // Might as well try to fill the cache for the flattened version, too.
1686 AliasCacheEntry* face = probe_alias_cache(flat);
1687 if (face->_adr_type == NULL) {
1688 face->_adr_type = flat;
1689 face->_index = idx;
1690 assert(alias_type(flat) == alias_type(idx), "flat type must work too");
1691 }
1692
1693 return alias_type(idx);
1694 }
1695
1696
1697 Compile::AliasType* Compile::alias_type(ciField* field) {
1698 const TypeOopPtr* t;
1699 if (field->is_static())
1700 t = TypeInstPtr::make(field->holder()->java_mirror());
1701 else
1702 t = TypeOopPtr::make_from_klass_raw(field->holder());
1703 AliasType* atp = alias_type(t->add_offset(field->offset_in_bytes()), field);
1704 assert((field->is_final() || field->is_stable()) == !atp->is_rewritable(), "must get the rewritable bits correct");
1705 return atp;
1706 }
1707
1708
1709 //------------------------------have_alias_type--------------------------------
1710 bool Compile::have_alias_type(const TypePtr* adr_type) {
1711 AliasCacheEntry* ace = probe_alias_cache(adr_type);
1712 if (ace->_adr_type == adr_type) {
1713 return true;
1714 }
1715
1716 // Handle special cases.
1717 if (adr_type == NULL) return true;
1718 if (adr_type == TypePtr::BOTTOM) return true;
1719
1720 return find_alias_type(adr_type, true, NULL) != NULL;
1721 }
1722
1723 //-----------------------------must_alias--------------------------------------
1724 // True if all values of the given address type are in the given alias category.
1725 bool Compile::must_alias(const TypePtr* adr_type, int alias_idx) {
1726 if (alias_idx == AliasIdxBot) return true; // the universal category
1727 if (adr_type == NULL) return true; // NULL serves as TypePtr::TOP
1728 if (alias_idx == AliasIdxTop) return false; // the empty category
1729 if (adr_type->base() == Type::AnyPtr) return false; // TypePtr::BOTTOM or its twins
1730
1731 // the only remaining possible overlap is identity
1732 int adr_idx = get_alias_index(adr_type);
1733 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, "");
1734 assert(adr_idx == alias_idx ||
1735 (alias_type(alias_idx)->adr_type() != TypeOopPtr::BOTTOM
1736 && adr_type != TypeOopPtr::BOTTOM),
1737 "should not be testing for overlap with an unsafe pointer");
1738 return adr_idx == alias_idx;
1739 }
1740
1741 //------------------------------can_alias--------------------------------------
1742 // True if any values of the given address type are in the given alias category.
1743 bool Compile::can_alias(const TypePtr* adr_type, int alias_idx) {
1744 if (alias_idx == AliasIdxTop) return false; // the empty category
1745 if (adr_type == NULL) return false; // NULL serves as TypePtr::TOP
1746 if (alias_idx == AliasIdxBot) return true; // the universal category
1747 if (adr_type->base() == Type::AnyPtr) return true; // TypePtr::BOTTOM or its twins
1748
1749 // the only remaining possible overlap is identity
1750 int adr_idx = get_alias_index(adr_type);
1751 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, "");
1752 return adr_idx == alias_idx;
1753 }
1754
1755
1756
1757 //---------------------------pop_warm_call-------------------------------------
1758 WarmCallInfo* Compile::pop_warm_call() {
1759 WarmCallInfo* wci = _warm_calls;
1760 if (wci != NULL) _warm_calls = wci->remove_from(wci);
1761 return wci;
1762 }
1763
1764 //----------------------------Inline_Warm--------------------------------------
1765 int Compile::Inline_Warm() {
1766 // If there is room, try to inline some more warm call sites.
1767 // %%% Do a graph index compaction pass when we think we're out of space?
1768 if (!InlineWarmCalls) return 0;
1769
1770 int calls_made_hot = 0;
1771 int room_to_grow = NodeCountInliningCutoff - unique();
1772 int amount_to_grow = MIN2(room_to_grow, (int)NodeCountInliningStep);
1773 int amount_grown = 0;
1774 WarmCallInfo* call;
1775 while (amount_to_grow > 0 && (call = pop_warm_call()) != NULL) {
1776 int est_size = (int)call->size();
1777 if (est_size > (room_to_grow - amount_grown)) {
1778 // This one won't fit anyway. Get rid of it.
1779 call->make_cold();
1780 continue;
1781 }
1782 call->make_hot();
1783 calls_made_hot++;
1784 amount_grown += est_size;
1785 amount_to_grow -= est_size;
1786 }
1787
1788 if (calls_made_hot > 0) set_major_progress();
1789 return calls_made_hot;
1790 }
1791
1792
1793 //----------------------------Finish_Warm--------------------------------------
1794 void Compile::Finish_Warm() {
1795 if (!InlineWarmCalls) return;
1796 if (failing()) return;
1797 if (warm_calls() == NULL) return;
1798
1799 // Clean up loose ends, if we are out of space for inlining.
1800 WarmCallInfo* call;
1801 while ((call = pop_warm_call()) != NULL) {
1802 call->make_cold();
1803 }
1804 }
1805
1806 //---------------------cleanup_loop_predicates-----------------------
1807 // Remove the opaque nodes that protect the predicates so that all unused
1808 // checks and uncommon_traps will be eliminated from the ideal graph
1809 void Compile::cleanup_loop_predicates(PhaseIterGVN &igvn) {
1810 if (predicate_count()==0) return;
1811 for (int i = predicate_count(); i > 0; i--) {
1812 Node * n = predicate_opaque1_node(i-1);
1813 assert(n->Opcode() == Op_Opaque1, "must be");
1814 igvn.replace_node(n, n->in(1));
1815 }
1816 assert(predicate_count()==0, "should be clean!");
1817 }
1818
1819 // StringOpts and late inlining of string methods
1820 void Compile::inline_string_calls(bool parse_time) {
1821 {
1822 // remove useless nodes to make the usage analysis simpler
1823 ResourceMark rm;
1824 PhaseRemoveUseless pru(initial_gvn(), for_igvn());
1825 }
1826
1827 {
1828 ResourceMark rm;
1829 print_method(PHASE_BEFORE_STRINGOPTS, 3);
1830 PhaseStringOpts pso(initial_gvn(), for_igvn());
1831 print_method(PHASE_AFTER_STRINGOPTS, 3);
1832 }
1833
1834 // now inline anything that we skipped the first time around
1835 if (!parse_time) {
1836 _late_inlines_pos = _late_inlines.length();
1837 }
1838
1839 while (_string_late_inlines.length() > 0) {
1840 CallGenerator* cg = _string_late_inlines.pop();
1841 cg->do_late_inline();
1842 if (failing()) return;
1843 }
1844 _string_late_inlines.trunc_to(0);
1845 }
1846
1847 // Late inlining of boxing methods
1848 void Compile::inline_boxing_calls(PhaseIterGVN& igvn) {
1849 if (_boxing_late_inlines.length() > 0) {
1850 assert(has_boxed_value(), "inconsistent");
1851
1852 PhaseGVN* gvn = initial_gvn();
1853 set_inlining_incrementally(true);
1854
1855 assert( igvn._worklist.size() == 0, "should be done with igvn" );
1856 for_igvn()->clear();
1857 gvn->replace_with(&igvn);
1858
1859 while (_boxing_late_inlines.length() > 0) {
1860 CallGenerator* cg = _boxing_late_inlines.pop();
1861 cg->do_late_inline();
1862 if (failing()) return;
1863 }
1864 _boxing_late_inlines.trunc_to(0);
1865
1866 {
1867 ResourceMark rm;
1868 PhaseRemoveUseless pru(gvn, for_igvn());
1869 }
1870
1871 igvn = PhaseIterGVN(gvn);
1872 igvn.optimize();
1873
1874 set_inlining_progress(false);
1875 set_inlining_incrementally(false);
1876 }
1877 }
1878
1879 void Compile::inline_incrementally_one(PhaseIterGVN& igvn) {
1880 assert(IncrementalInline, "incremental inlining should be on");
1881 PhaseGVN* gvn = initial_gvn();
1882
1883 set_inlining_progress(false);
1884 for_igvn()->clear();
1885 gvn->replace_with(&igvn);
1886
1887 int i = 0;
1888
1889 for (; i <_late_inlines.length() && !inlining_progress(); i++) {
1890 CallGenerator* cg = _late_inlines.at(i);
1891 _late_inlines_pos = i+1;
1892 cg->do_late_inline();
1893 if (failing()) return;
1894 }
1895 int j = 0;
1896 for (; i < _late_inlines.length(); i++, j++) {
1897 _late_inlines.at_put(j, _late_inlines.at(i));
1898 }
1899 _late_inlines.trunc_to(j);
1900
1901 {
1902 ResourceMark rm;
1903 PhaseRemoveUseless pru(gvn, for_igvn());
1904 }
1905
1906 igvn = PhaseIterGVN(gvn);
1907 }
1908
1909 // Perform incremental inlining until bound on number of live nodes is reached
1910 void Compile::inline_incrementally(PhaseIterGVN& igvn) {
1911 PhaseGVN* gvn = initial_gvn();
1912
1913 set_inlining_incrementally(true);
1914 set_inlining_progress(true);
1915 uint low_live_nodes = 0;
1916
1917 while(inlining_progress() && _late_inlines.length() > 0) {
1918
1919 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) {
1920 if (low_live_nodes < (uint)LiveNodeCountInliningCutoff * 8 / 10) {
1921 // PhaseIdealLoop is expensive so we only try it once we are
1922 // out of loop and we only try it again if the previous helped
1923 // got the number of nodes down significantly
1924 PhaseIdealLoop ideal_loop( igvn, false, true );
1925 if (failing()) return;
1926 low_live_nodes = live_nodes();
1927 _major_progress = true;
1928 }
1929
1930 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) {
1931 break;
1932 }
1933 }
1934
1935 inline_incrementally_one(igvn);
1936
1937 if (failing()) return;
1938
1939 igvn.optimize();
1940
1941 if (failing()) return;
1942 }
1943
1944 assert( igvn._worklist.size() == 0, "should be done with igvn" );
1945
1946 if (_string_late_inlines.length() > 0) {
1947 assert(has_stringbuilder(), "inconsistent");
1948 for_igvn()->clear();
1949 initial_gvn()->replace_with(&igvn);
1950
1951 inline_string_calls(false);
1952
1953 if (failing()) return;
1954
1955 {
1956 ResourceMark rm;
1957 PhaseRemoveUseless pru(initial_gvn(), for_igvn());
1958 }
1959
1960 igvn = PhaseIterGVN(gvn);
1961
1962 igvn.optimize();
1963 }
1964
1965 set_inlining_incrementally(false);
1966 }
1967
1968
1969 //------------------------------Optimize---------------------------------------
1970 // Given a graph, optimize it.
1971 void Compile::Optimize() {
1972 TracePhase t1("optimizer", &_t_optimizer, true);
1973
1974 #ifndef PRODUCT
1975 if (env()->break_at_compile()) {
1976 BREAKPOINT;
1977 }
1978
1979 #endif
1980
1981 ResourceMark rm;
1982 int loop_opts_cnt;
1983
1984 NOT_PRODUCT( verify_graph_edges(); )
1985
1986 print_method(PHASE_AFTER_PARSING);
1987
1988 {
1989 // Iterative Global Value Numbering, including ideal transforms
1990 // Initialize IterGVN with types and values from parse-time GVN
1991 PhaseIterGVN igvn(initial_gvn());
1992 {
1993 NOT_PRODUCT( TracePhase t2("iterGVN", &_t_iterGVN, TimeCompiler); )
1994 igvn.optimize();
1995 }
1996
1997 print_method(PHASE_ITER_GVN1, 2);
1998
1999 if (failing()) return;
2000
2001 {
2002 NOT_PRODUCT( TracePhase t2("incrementalInline", &_t_incrInline, TimeCompiler); )
2003 inline_incrementally(igvn);
2004 }
2005
2006 print_method(PHASE_INCREMENTAL_INLINE, 2);
2007
2008 if (failing()) return;
2009
2010 if (eliminate_boxing()) {
2011 NOT_PRODUCT( TracePhase t2("incrementalInline", &_t_incrInline, TimeCompiler); )
2012 // Inline valueOf() methods now.
2013 inline_boxing_calls(igvn);
2014
2015 print_method(PHASE_INCREMENTAL_BOXING_INLINE, 2);
2016
2017 if (failing()) return;
2018 }
2019
2020 // Remove the speculative part of types and clean up the graph from
2021 // the extra CastPP nodes whose only purpose is to carry them. Do
2022 // that early so that optimizations are not disrupted by the extra
2023 // CastPP nodes.
2024 remove_speculative_types(igvn);
2025
2026 // No more new expensive nodes will be added to the list from here
2027 // so keep only the actual candidates for optimizations.
2028 cleanup_expensive_nodes(igvn);
2029
2030 // Perform escape analysis
2031 if (_do_escape_analysis && ConnectionGraph::has_candidates(this)) {
2032 if (has_loops()) {
2033 // Cleanup graph (remove dead nodes).
2034 TracePhase t2("idealLoop", &_t_idealLoop, true);
2035 PhaseIdealLoop ideal_loop( igvn, false, true );
2036 if (major_progress()) print_method(PHASE_PHASEIDEAL_BEFORE_EA, 2);
2037 if (failing()) return;
2038 }
2039 ConnectionGraph::do_analysis(this, &igvn);
2040
2041 if (failing()) return;
2042
2043 // Optimize out fields loads from scalar replaceable allocations.
2044 igvn.optimize();
2045 print_method(PHASE_ITER_GVN_AFTER_EA, 2);
2046
2047 if (failing()) return;
2048
2049 if (congraph() != NULL && macro_count() > 0) {
2050 NOT_PRODUCT( TracePhase t2("macroEliminate", &_t_macroEliminate, TimeCompiler); )
2051 PhaseMacroExpand mexp(igvn);
2052 mexp.eliminate_macro_nodes();
2053 igvn.set_delay_transform(false);
2054
2055 igvn.optimize();
2056 print_method(PHASE_ITER_GVN_AFTER_ELIMINATION, 2);
2057
2058 if (failing()) return;
2059 }
2060 }
2061
2062 // Loop transforms on the ideal graph. Range Check Elimination,
2063 // peeling, unrolling, etc.
2064
2065 // Set loop opts counter
2066 loop_opts_cnt = num_loop_opts();
2067 if((loop_opts_cnt > 0) && (has_loops() || has_split_ifs())) {
2068 {
2069 TracePhase t2("idealLoop", &_t_idealLoop, true);
2070 PhaseIdealLoop ideal_loop( igvn, true );
2071 loop_opts_cnt--;
2072 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP1, 2);
2073 if (failing()) return;
2074 }
2075 // Loop opts pass if partial peeling occurred in previous pass
2076 if(PartialPeelLoop && major_progress() && (loop_opts_cnt > 0)) {
2077 TracePhase t3("idealLoop", &_t_idealLoop, true);
2078 PhaseIdealLoop ideal_loop( igvn, false );
2079 loop_opts_cnt--;
2080 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP2, 2);
2081 if (failing()) return;
2082 }
2083 // Loop opts pass for loop-unrolling before CCP
2084 if(major_progress() && (loop_opts_cnt > 0)) {
2085 TracePhase t4("idealLoop", &_t_idealLoop, true);
2086 PhaseIdealLoop ideal_loop( igvn, false );
2087 loop_opts_cnt--;
2088 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP3, 2);
2089 }
2090 if (!failing()) {
2091 // Verify that last round of loop opts produced a valid graph
2092 NOT_PRODUCT( TracePhase t2("idealLoopVerify", &_t_idealLoopVerify, TimeCompiler); )
2093 PhaseIdealLoop::verify(igvn);
2094 }
2095 }
2096 if (failing()) return;
2097
2098 // Conditional Constant Propagation;
2099 PhaseCCP ccp( &igvn );
2100 assert( true, "Break here to ccp.dump_nodes_and_types(_root,999,1)");
2101 {
2102 TracePhase t2("ccp", &_t_ccp, true);
2103 ccp.do_transform();
2104 }
2105 print_method(PHASE_CPP1, 2);
2106
2107 assert( true, "Break here to ccp.dump_old2new_map()");
2108
2109 // Iterative Global Value Numbering, including ideal transforms
2110 {
2111 NOT_PRODUCT( TracePhase t2("iterGVN2", &_t_iterGVN2, TimeCompiler); )
2112 igvn = ccp;
2113 igvn.optimize();
2114 }
2115
2116 print_method(PHASE_ITER_GVN2, 2);
2117
2118 if (failing()) return;
2119
2120 // Loop transforms on the ideal graph. Range Check Elimination,
2121 // peeling, unrolling, etc.
2122 if(loop_opts_cnt > 0) {
2123 debug_only( int cnt = 0; );
2124 while(major_progress() && (loop_opts_cnt > 0)) {
2125 TracePhase t2("idealLoop", &_t_idealLoop, true);
2126 assert( cnt++ < 40, "infinite cycle in loop optimization" );
2127 PhaseIdealLoop ideal_loop( igvn, true);
2128 loop_opts_cnt--;
2129 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP_ITERATIONS, 2);
2130 if (failing()) return;
2131 }
2132 }
2133
2134 {
2135 // Verify that all previous optimizations produced a valid graph
2136 // at least to this point, even if no loop optimizations were done.
2137 NOT_PRODUCT( TracePhase t2("idealLoopVerify", &_t_idealLoopVerify, TimeCompiler); )
2138 PhaseIdealLoop::verify(igvn);
2139 }
2140
2141 {
2142 NOT_PRODUCT( TracePhase t2("macroExpand", &_t_macroExpand, TimeCompiler); )
2143 PhaseMacroExpand mex(igvn);
2144 if (mex.expand_macro_nodes()) {
2145 assert(failing(), "must bail out w/ explicit message");
2146 return;
2147 }
2148 }
2149
2150 } // (End scope of igvn; run destructor if necessary for asserts.)
2151
2152 dump_inlining();
2153 // A method with only infinite loops has no edges entering loops from root
2154 {
2155 NOT_PRODUCT( TracePhase t2("graphReshape", &_t_graphReshaping, TimeCompiler); )
2156 if (final_graph_reshaping()) {
2157 assert(failing(), "must bail out w/ explicit message");
2158 return;
2159 }
2160 }
2161
2162 print_method(PHASE_OPTIMIZE_FINISHED, 2);
2163 }
2164
2165
2166 //------------------------------Code_Gen---------------------------------------
2167 // Given a graph, generate code for it
2168 void Compile::Code_Gen() {
2169 if (failing()) {
2170 return;
2171 }
2172
2173 // Perform instruction selection. You might think we could reclaim Matcher
2174 // memory PDQ, but actually the Matcher is used in generating spill code.
2175 // Internals of the Matcher (including some VectorSets) must remain live
2176 // for awhile - thus I cannot reclaim Matcher memory lest a VectorSet usage
2177 // set a bit in reclaimed memory.
2178
2179 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine
2180 // nodes. Mapping is only valid at the root of each matched subtree.
2181 NOT_PRODUCT( verify_graph_edges(); )
2182
2183 Matcher matcher;
2184 _matcher = &matcher;
2185 {
2186 TracePhase t2("matcher", &_t_matcher, true);
2187 matcher.match();
2188 }
2189 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine
2190 // nodes. Mapping is only valid at the root of each matched subtree.
2191 NOT_PRODUCT( verify_graph_edges(); )
2192
2193 // If you have too many nodes, or if matching has failed, bail out
2194 check_node_count(0, "out of nodes matching instructions");
2195 if (failing()) {
2196 return;
2197 }
2198
2199 // Build a proper-looking CFG
2200 PhaseCFG cfg(node_arena(), root(), matcher);
2201 _cfg = &cfg;
2202 {
2203 NOT_PRODUCT( TracePhase t2("scheduler", &_t_scheduler, TimeCompiler); )
2204 bool success = cfg.do_global_code_motion();
2205 if (!success) {
2206 return;
2207 }
2208
2209 print_method(PHASE_GLOBAL_CODE_MOTION, 2);
2210 NOT_PRODUCT( verify_graph_edges(); )
2211 debug_only( cfg.verify(); )
2212 }
2213
2214 PhaseChaitin regalloc(unique(), cfg, matcher);
2215 _regalloc = ®alloc;
2216 {
2217 TracePhase t2("regalloc", &_t_registerAllocation, true);
2218 // Perform register allocation. After Chaitin, use-def chains are
2219 // no longer accurate (at spill code) and so must be ignored.
2220 // Node->LRG->reg mappings are still accurate.
2221 _regalloc->Register_Allocate();
2222
2223 // Bail out if the allocator builds too many nodes
2224 if (failing()) {
2225 return;
2226 }
2227 }
2228
2229 // Prior to register allocation we kept empty basic blocks in case the
2230 // the allocator needed a place to spill. After register allocation we
2231 // are not adding any new instructions. If any basic block is empty, we
2232 // can now safely remove it.
2233 {
2234 NOT_PRODUCT( TracePhase t2("blockOrdering", &_t_blockOrdering, TimeCompiler); )
2235 cfg.remove_empty_blocks();
2236 if (do_freq_based_layout()) {
2237 PhaseBlockLayout layout(cfg);
2238 } else {
2239 cfg.set_loop_alignment();
2240 }
2241 cfg.fixup_flow();
2242 }
2243
2244 // Apply peephole optimizations
2245 if( OptoPeephole ) {
2246 NOT_PRODUCT( TracePhase t2("peephole", &_t_peephole, TimeCompiler); )
2247 PhasePeephole peep( _regalloc, cfg);
2248 peep.do_transform();
2249 }
2250
2251 // Convert Nodes to instruction bits in a buffer
2252 {
2253 // %%%% workspace merge brought two timers together for one job
2254 TracePhase t2a("output", &_t_output, true);
2255 NOT_PRODUCT( TraceTime t2b(NULL, &_t_codeGeneration, TimeCompiler, false); )
2256 Output();
2257 }
2258
2259 print_method(PHASE_FINAL_CODE);
2260
2261 // He's dead, Jim.
2262 _cfg = (PhaseCFG*)0xdeadbeef;
2263 _regalloc = (PhaseChaitin*)0xdeadbeef;
2264 }
2265
2266
2267 //------------------------------dump_asm---------------------------------------
2268 // Dump formatted assembly
2269 #ifndef PRODUCT
2270 void Compile::dump_asm(int *pcs, uint pc_limit) {
2271 bool cut_short = false;
2272 tty->print_cr("#");
2273 tty->print("# "); _tf->dump(); tty->cr();
2274 tty->print_cr("#");
2275
2276 // For all blocks
2277 int pc = 0x0; // Program counter
2278 char starts_bundle = ' ';
2279 _regalloc->dump_frame();
2280
2281 Node *n = NULL;
2282 for (uint i = 0; i < _cfg->number_of_blocks(); i++) {
2283 if (VMThread::should_terminate()) {
2284 cut_short = true;
2285 break;
2286 }
2287 Block* block = _cfg->get_block(i);
2288 if (block->is_connector() && !Verbose) {
2289 continue;
2290 }
2291 n = block->head();
2292 if (pcs && n->_idx < pc_limit) {
2293 tty->print("%3.3x ", pcs[n->_idx]);
2294 } else {
2295 tty->print(" ");
2296 }
2297 block->dump_head(_cfg);
2298 if (block->is_connector()) {
2299 tty->print_cr(" # Empty connector block");
2300 } else if (block->num_preds() == 2 && block->pred(1)->is_CatchProj() && block->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) {
2301 tty->print_cr(" # Block is sole successor of call");
2302 }
2303
2304 // For all instructions
2305 Node *delay = NULL;
2306 for (uint j = 0; j < block->number_of_nodes(); j++) {
2307 if (VMThread::should_terminate()) {
2308 cut_short = true;
2309 break;
2310 }
2311 n = block->get_node(j);
2312 if (valid_bundle_info(n)) {
2313 Bundle* bundle = node_bundling(n);
2314 if (bundle->used_in_unconditional_delay()) {
2315 delay = n;
2316 continue;
2317 }
2318 if (bundle->starts_bundle()) {
2319 starts_bundle = '+';
2320 }
2321 }
2322
2323 if (WizardMode) {
2324 n->dump();
2325 }
2326
2327 if( !n->is_Region() && // Dont print in the Assembly
2328 !n->is_Phi() && // a few noisely useless nodes
2329 !n->is_Proj() &&
2330 !n->is_MachTemp() &&
2331 !n->is_SafePointScalarObject() &&
2332 !n->is_Catch() && // Would be nice to print exception table targets
2333 !n->is_MergeMem() && // Not very interesting
2334 !n->is_top() && // Debug info table constants
2335 !(n->is_Con() && !n->is_Mach())// Debug info table constants
2336 ) {
2337 if (pcs && n->_idx < pc_limit)
2338 tty->print("%3.3x", pcs[n->_idx]);
2339 else
2340 tty->print(" ");
2341 tty->print(" %c ", starts_bundle);
2342 starts_bundle = ' ';
2343 tty->print("\t");
2344 n->format(_regalloc, tty);
2345 tty->cr();
2346 }
2347
2348 // If we have an instruction with a delay slot, and have seen a delay,
2349 // then back up and print it
2350 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
2351 assert(delay != NULL, "no unconditional delay instruction");
2352 if (WizardMode) delay->dump();
2353
2354 if (node_bundling(delay)->starts_bundle())
2355 starts_bundle = '+';
2356 if (pcs && n->_idx < pc_limit)
2357 tty->print("%3.3x", pcs[n->_idx]);
2358 else
2359 tty->print(" ");
2360 tty->print(" %c ", starts_bundle);
2361 starts_bundle = ' ';
2362 tty->print("\t");
2363 delay->format(_regalloc, tty);
2364 tty->print_cr("");
2365 delay = NULL;
2366 }
2367
2368 // Dump the exception table as well
2369 if( n->is_Catch() && (Verbose || WizardMode) ) {
2370 // Print the exception table for this offset
2371 _handler_table.print_subtable_for(pc);
2372 }
2373 }
2374
2375 if (pcs && n->_idx < pc_limit)
2376 tty->print_cr("%3.3x", pcs[n->_idx]);
2377 else
2378 tty->print_cr("");
2379
2380 assert(cut_short || delay == NULL, "no unconditional delay branch");
2381
2382 } // End of per-block dump
2383 tty->print_cr("");
2384
2385 if (cut_short) tty->print_cr("*** disassembly is cut short ***");
2386 }
2387 #endif
2388
2389 //------------------------------Final_Reshape_Counts---------------------------
2390 // This class defines counters to help identify when a method
2391 // may/must be executed using hardware with only 24-bit precision.
2392 struct Final_Reshape_Counts : public StackObj {
2393 int _call_count; // count non-inlined 'common' calls
2394 int _float_count; // count float ops requiring 24-bit precision
2395 int _double_count; // count double ops requiring more precision
2396 int _java_call_count; // count non-inlined 'java' calls
2397 int _inner_loop_count; // count loops which need alignment
2398 VectorSet _visited; // Visitation flags
2399 Node_List _tests; // Set of IfNodes & PCTableNodes
2400
2401 Final_Reshape_Counts() :
2402 _call_count(0), _float_count(0), _double_count(0),
2403 _java_call_count(0), _inner_loop_count(0),
2404 _visited( Thread::current()->resource_area() ) { }
2405
2406 void inc_call_count () { _call_count ++; }
2407 void inc_float_count () { _float_count ++; }
2408 void inc_double_count() { _double_count++; }
2409 void inc_java_call_count() { _java_call_count++; }
2410 void inc_inner_loop_count() { _inner_loop_count++; }
2411
2412 int get_call_count () const { return _call_count ; }
2413 int get_float_count () const { return _float_count ; }
2414 int get_double_count() const { return _double_count; }
2415 int get_java_call_count() const { return _java_call_count; }
2416 int get_inner_loop_count() const { return _inner_loop_count; }
2417 };
2418
2419 #ifdef ASSERT
2420 static bool oop_offset_is_sane(const TypeInstPtr* tp) {
2421 ciInstanceKlass *k = tp->klass()->as_instance_klass();
2422 // Make sure the offset goes inside the instance layout.
2423 return k->contains_field_offset(tp->offset());
2424 // Note that OffsetBot and OffsetTop are very negative.
2425 }
2426 #endif
2427
2428 // Eliminate trivially redundant StoreCMs and accumulate their
2429 // precedence edges.
2430 void Compile::eliminate_redundant_card_marks(Node* n) {
2431 assert(n->Opcode() == Op_StoreCM, "expected StoreCM");
2432 if (n->in(MemNode::Address)->outcnt() > 1) {
2433 // There are multiple users of the same address so it might be
2434 // possible to eliminate some of the StoreCMs
2435 Node* mem = n->in(MemNode::Memory);
2436 Node* adr = n->in(MemNode::Address);
2437 Node* val = n->in(MemNode::ValueIn);
2438 Node* prev = n;
2439 bool done = false;
2440 // Walk the chain of StoreCMs eliminating ones that match. As
2441 // long as it's a chain of single users then the optimization is
2442 // safe. Eliminating partially redundant StoreCMs would require
2443 // cloning copies down the other paths.
2444 while (mem->Opcode() == Op_StoreCM && mem->outcnt() == 1 && !done) {
2445 if (adr == mem->in(MemNode::Address) &&
2446 val == mem->in(MemNode::ValueIn)) {
2447 // redundant StoreCM
2448 if (mem->req() > MemNode::OopStore) {
2449 // Hasn't been processed by this code yet.
2450 n->add_prec(mem->in(MemNode::OopStore));
2451 } else {
2452 // Already converted to precedence edge
2453 for (uint i = mem->req(); i < mem->len(); i++) {
2454 // Accumulate any precedence edges
2455 if (mem->in(i) != NULL) {
2456 n->add_prec(mem->in(i));
2457 }
2458 }
2459 // Everything above this point has been processed.
2460 done = true;
2461 }
2462 // Eliminate the previous StoreCM
2463 prev->set_req(MemNode::Memory, mem->in(MemNode::Memory));
2464 assert(mem->outcnt() == 0, "should be dead");
2465 mem->disconnect_inputs(NULL, this);
2466 } else {
2467 prev = mem;
2468 }
2469 mem = prev->in(MemNode::Memory);
2470 }
2471 }
2472 }
2473
2474 //------------------------------final_graph_reshaping_impl----------------------
2475 // Implement items 1-5 from final_graph_reshaping below.
2476 void Compile::final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc) {
2477
2478 if ( n->outcnt() == 0 ) return; // dead node
2479 uint nop = n->Opcode();
2480
2481 // Check for 2-input instruction with "last use" on right input.
2482 // Swap to left input. Implements item (2).
2483 if( n->req() == 3 && // two-input instruction
2484 n->in(1)->outcnt() > 1 && // left use is NOT a last use
2485 (!n->in(1)->is_Phi() || n->in(1)->in(2) != n) && // it is not data loop
2486 n->in(2)->outcnt() == 1 &&// right use IS a last use
2487 !n->in(2)->is_Con() ) { // right use is not a constant
2488 // Check for commutative opcode
2489 switch( nop ) {
2490 case Op_AddI: case Op_AddF: case Op_AddD: case Op_AddL:
2491 case Op_MaxI: case Op_MinI:
2492 case Op_MulI: case Op_MulF: case Op_MulD: case Op_MulL:
2493 case Op_AndL: case Op_XorL: case Op_OrL:
2494 case Op_AndI: case Op_XorI: case Op_OrI: {
2495 // Move "last use" input to left by swapping inputs
2496 n->swap_edges(1, 2);
2497 break;
2498 }
2499 default:
2500 break;
2501 }
2502 }
2503
2504 #ifdef ASSERT
2505 if( n->is_Mem() ) {
2506 int alias_idx = get_alias_index(n->as_Mem()->adr_type());
2507 assert( n->in(0) != NULL || alias_idx != Compile::AliasIdxRaw ||
2508 // oop will be recorded in oop map if load crosses safepoint
2509 n->is_Load() && (n->as_Load()->bottom_type()->isa_oopptr() ||
2510 LoadNode::is_immutable_value(n->in(MemNode::Address))),
2511 "raw memory operations should have control edge");
2512 }
2513 #endif
2514 // Count FPU ops and common calls, implements item (3)
2515 switch( nop ) {
2516 // Count all float operations that may use FPU
2517 case Op_AddF:
2518 case Op_SubF:
2519 case Op_MulF:
2520 case Op_DivF:
2521 case Op_NegF:
2522 case Op_ModF:
2523 case Op_ConvI2F:
2524 case Op_ConF:
2525 case Op_CmpF:
2526 case Op_CmpF3:
2527 // case Op_ConvL2F: // longs are split into 32-bit halves
2528 frc.inc_float_count();
2529 break;
2530
2531 case Op_ConvF2D:
2532 case Op_ConvD2F:
2533 frc.inc_float_count();
2534 frc.inc_double_count();
2535 break;
2536
2537 // Count all double operations that may use FPU
2538 case Op_AddD:
2539 case Op_SubD:
2540 case Op_MulD:
2541 case Op_DivD:
2542 case Op_NegD:
2543 case Op_ModD:
2544 case Op_ConvI2D:
2545 case Op_ConvD2I:
2546 // case Op_ConvL2D: // handled by leaf call
2547 // case Op_ConvD2L: // handled by leaf call
2548 case Op_ConD:
2549 case Op_CmpD:
2550 case Op_CmpD3:
2551 frc.inc_double_count();
2552 break;
2553 case Op_Opaque1: // Remove Opaque Nodes before matching
2554 case Op_Opaque2: // Remove Opaque Nodes before matching
2555 n->subsume_by(n->in(1), this);
2556 break;
2557 case Op_CallStaticJava:
2558 case Op_CallJava:
2559 case Op_CallDynamicJava:
2560 frc.inc_java_call_count(); // Count java call site;
2561 case Op_CallRuntime:
2562 case Op_CallLeaf:
2563 case Op_CallLeafNoFP: {
2564 assert( n->is_Call(), "" );
2565 CallNode *call = n->as_Call();
2566 // Count call sites where the FP mode bit would have to be flipped.
2567 // Do not count uncommon runtime calls:
2568 // uncommon_trap, _complete_monitor_locking, _complete_monitor_unlocking,
2569 // _new_Java, _new_typeArray, _new_objArray, _rethrow_Java, ...
2570 if( !call->is_CallStaticJava() || !call->as_CallStaticJava()->_name ) {
2571 frc.inc_call_count(); // Count the call site
2572 } else { // See if uncommon argument is shared
2573 Node *n = call->in(TypeFunc::Parms);
2574 int nop = n->Opcode();
2575 // Clone shared simple arguments to uncommon calls, item (1).
2576 if( n->outcnt() > 1 &&
2577 !n->is_Proj() &&
2578 nop != Op_CreateEx &&
2579 nop != Op_CheckCastPP &&
2580 nop != Op_DecodeN &&
2581 nop != Op_DecodeNKlass &&
2582 !n->is_Mem() ) {
2583 Node *x = n->clone();
2584 call->set_req( TypeFunc::Parms, x );
2585 }
2586 }
2587 break;
2588 }
2589
2590 case Op_StoreD:
2591 case Op_LoadD:
2592 case Op_LoadD_unaligned:
2593 frc.inc_double_count();
2594 goto handle_mem;
2595 case Op_StoreF:
2596 case Op_LoadF:
2597 frc.inc_float_count();
2598 goto handle_mem;
2599
2600 case Op_StoreCM:
2601 {
2602 // Convert OopStore dependence into precedence edge
2603 Node* prec = n->in(MemNode::OopStore);
2604 n->del_req(MemNode::OopStore);
2605 n->add_prec(prec);
2606 eliminate_redundant_card_marks(n);
2607 }
2608
2609 // fall through
2610
2611 case Op_StoreB:
2612 case Op_StoreC:
2613 case Op_StorePConditional:
2614 case Op_StoreI:
2615 case Op_StoreL:
2616 case Op_StoreIConditional:
2617 case Op_StoreLConditional:
2618 case Op_CompareAndSwapI:
2619 case Op_CompareAndSwapL:
2620 case Op_CompareAndSwapP:
2621 case Op_CompareAndSwapN:
2622 case Op_GetAndAddI:
2623 case Op_GetAndAddL:
2624 case Op_GetAndSetI:
2625 case Op_GetAndSetL:
2626 case Op_GetAndSetP:
2627 case Op_GetAndSetN:
2628 case Op_StoreP:
2629 case Op_StoreN:
2630 case Op_StoreNKlass:
2631 case Op_LoadB:
2632 case Op_LoadUB:
2633 case Op_LoadUS:
2634 case Op_LoadI:
2635 case Op_LoadKlass:
2636 case Op_LoadNKlass:
2637 case Op_LoadL:
2638 case Op_LoadL_unaligned:
2639 case Op_LoadPLocked:
2640 case Op_LoadP:
2641 case Op_LoadN:
2642 case Op_LoadRange:
2643 case Op_LoadS: {
2644 handle_mem:
2645 #ifdef ASSERT
2646 if( VerifyOptoOopOffsets ) {
2647 assert( n->is_Mem(), "" );
2648 MemNode *mem = (MemNode*)n;
2649 // Check to see if address types have grounded out somehow.
2650 const TypeInstPtr *tp = mem->in(MemNode::Address)->bottom_type()->isa_instptr();
2651 assert( !tp || oop_offset_is_sane(tp), "" );
2652 }
2653 #endif
2654 break;
2655 }
2656
2657 case Op_AddP: { // Assert sane base pointers
2658 Node *addp = n->in(AddPNode::Address);
2659 assert( !addp->is_AddP() ||
2660 addp->in(AddPNode::Base)->is_top() || // Top OK for allocation
2661 addp->in(AddPNode::Base) == n->in(AddPNode::Base),
2662 "Base pointers must match" );
2663 #ifdef _LP64
2664 if ((UseCompressedOops || UseCompressedClassPointers) &&
2665 addp->Opcode() == Op_ConP &&
2666 addp == n->in(AddPNode::Base) &&
2667 n->in(AddPNode::Offset)->is_Con()) {
2668 // Use addressing with narrow klass to load with offset on x86.
2669 // On sparc loading 32-bits constant and decoding it have less
2670 // instructions (4) then load 64-bits constant (7).
2671 // Do this transformation here since IGVN will convert ConN back to ConP.
2672 const Type* t = addp->bottom_type();
2673 if (t->isa_oopptr() || t->isa_klassptr()) {
2674 Node* nn = NULL;
2675
2676 int op = t->isa_oopptr() ? Op_ConN : Op_ConNKlass;
2677
2678 // Look for existing ConN node of the same exact type.
2679 Node* r = root();
2680 uint cnt = r->outcnt();
2681 for (uint i = 0; i < cnt; i++) {
2682 Node* m = r->raw_out(i);
2683 if (m!= NULL && m->Opcode() == op &&
2684 m->bottom_type()->make_ptr() == t) {
2685 nn = m;
2686 break;
2687 }
2688 }
2689 if (nn != NULL) {
2690 // Decode a narrow oop to match address
2691 // [R12 + narrow_oop_reg<<3 + offset]
2692 if (t->isa_oopptr()) {
2693 nn = new (this) DecodeNNode(nn, t);
2694 } else {
2695 nn = new (this) DecodeNKlassNode(nn, t);
2696 }
2697 n->set_req(AddPNode::Base, nn);
2698 n->set_req(AddPNode::Address, nn);
2699 if (addp->outcnt() == 0) {
2700 addp->disconnect_inputs(NULL, this);
2701 }
2702 }
2703 }
2704 }
2705 #endif
2706 break;
2707 }
2708
2709 #ifdef _LP64
2710 case Op_CastPP:
2711 if (n->in(1)->is_DecodeN() && Matcher::gen_narrow_oop_implicit_null_checks()) {
2712 Node* in1 = n->in(1);
2713 const Type* t = n->bottom_type();
2714 Node* new_in1 = in1->clone();
2715 new_in1->as_DecodeN()->set_type(t);
2716
2717 if (!Matcher::narrow_oop_use_complex_address()) {
2718 //
2719 // x86, ARM and friends can handle 2 adds in addressing mode
2720 // and Matcher can fold a DecodeN node into address by using
2721 // a narrow oop directly and do implicit NULL check in address:
2722 //
2723 // [R12 + narrow_oop_reg<<3 + offset]
2724 // NullCheck narrow_oop_reg
2725 //
2726 // On other platforms (Sparc) we have to keep new DecodeN node and
2727 // use it to do implicit NULL check in address:
2728 //
2729 // decode_not_null narrow_oop_reg, base_reg
2730 // [base_reg + offset]
2731 // NullCheck base_reg
2732 //
2733 // Pin the new DecodeN node to non-null path on these platform (Sparc)
2734 // to keep the information to which NULL check the new DecodeN node
2735 // corresponds to use it as value in implicit_null_check().
2736 //
2737 new_in1->set_req(0, n->in(0));
2738 }
2739
2740 n->subsume_by(new_in1, this);
2741 if (in1->outcnt() == 0) {
2742 in1->disconnect_inputs(NULL, this);
2743 }
2744 }
2745 break;
2746
2747 case Op_CmpP:
2748 // Do this transformation here to preserve CmpPNode::sub() and
2749 // other TypePtr related Ideal optimizations (for example, ptr nullness).
2750 if (n->in(1)->is_DecodeNarrowPtr() || n->in(2)->is_DecodeNarrowPtr()) {
2751 Node* in1 = n->in(1);
2752 Node* in2 = n->in(2);
2753 if (!in1->is_DecodeNarrowPtr()) {
2754 in2 = in1;
2755 in1 = n->in(2);
2756 }
2757 assert(in1->is_DecodeNarrowPtr(), "sanity");
2758
2759 Node* new_in2 = NULL;
2760 if (in2->is_DecodeNarrowPtr()) {
2761 assert(in2->Opcode() == in1->Opcode(), "must be same node type");
2762 new_in2 = in2->in(1);
2763 } else if (in2->Opcode() == Op_ConP) {
2764 const Type* t = in2->bottom_type();
2765 if (t == TypePtr::NULL_PTR) {
2766 assert(in1->is_DecodeN(), "compare klass to null?");
2767 // Don't convert CmpP null check into CmpN if compressed
2768 // oops implicit null check is not generated.
2769 // This will allow to generate normal oop implicit null check.
2770 if (Matcher::gen_narrow_oop_implicit_null_checks())
2771 new_in2 = ConNode::make(this, TypeNarrowOop::NULL_PTR);
2772 //
2773 // This transformation together with CastPP transformation above
2774 // will generated code for implicit NULL checks for compressed oops.
2775 //
2776 // The original code after Optimize()
2777 //
2778 // LoadN memory, narrow_oop_reg
2779 // decode narrow_oop_reg, base_reg
2780 // CmpP base_reg, NULL
2781 // CastPP base_reg // NotNull
2782 // Load [base_reg + offset], val_reg
2783 //
2784 // after these transformations will be
2785 //
2786 // LoadN memory, narrow_oop_reg
2787 // CmpN narrow_oop_reg, NULL
2788 // decode_not_null narrow_oop_reg, base_reg
2789 // Load [base_reg + offset], val_reg
2790 //
2791 // and the uncommon path (== NULL) will use narrow_oop_reg directly
2792 // since narrow oops can be used in debug info now (see the code in
2793 // final_graph_reshaping_walk()).
2794 //
2795 // At the end the code will be matched to
2796 // on x86:
2797 //
2798 // Load_narrow_oop memory, narrow_oop_reg
2799 // Load [R12 + narrow_oop_reg<<3 + offset], val_reg
2800 // NullCheck narrow_oop_reg
2801 //
2802 // and on sparc:
2803 //
2804 // Load_narrow_oop memory, narrow_oop_reg
2805 // decode_not_null narrow_oop_reg, base_reg
2806 // Load [base_reg + offset], val_reg
2807 // NullCheck base_reg
2808 //
2809 } else if (t->isa_oopptr()) {
2810 new_in2 = ConNode::make(this, t->make_narrowoop());
2811 } else if (t->isa_klassptr()) {
2812 new_in2 = ConNode::make(this, t->make_narrowklass());
2813 }
2814 }
2815 if (new_in2 != NULL) {
2816 Node* cmpN = new (this) CmpNNode(in1->in(1), new_in2);
2817 n->subsume_by(cmpN, this);
2818 if (in1->outcnt() == 0) {
2819 in1->disconnect_inputs(NULL, this);
2820 }
2821 if (in2->outcnt() == 0) {
2822 in2->disconnect_inputs(NULL, this);
2823 }
2824 }
2825 }
2826 break;
2827
2828 case Op_DecodeN:
2829 case Op_DecodeNKlass:
2830 assert(!n->in(1)->is_EncodeNarrowPtr(), "should be optimized out");
2831 // DecodeN could be pinned when it can't be fold into
2832 // an address expression, see the code for Op_CastPP above.
2833 assert(n->in(0) == NULL || (UseCompressedOops && !Matcher::narrow_oop_use_complex_address()), "no control");
2834 break;
2835
2836 case Op_EncodeP:
2837 case Op_EncodePKlass: {
2838 Node* in1 = n->in(1);
2839 if (in1->is_DecodeNarrowPtr()) {
2840 n->subsume_by(in1->in(1), this);
2841 } else if (in1->Opcode() == Op_ConP) {
2842 const Type* t = in1->bottom_type();
2843 if (t == TypePtr::NULL_PTR) {
2844 assert(t->isa_oopptr(), "null klass?");
2845 n->subsume_by(ConNode::make(this, TypeNarrowOop::NULL_PTR), this);
2846 } else if (t->isa_oopptr()) {
2847 n->subsume_by(ConNode::make(this, t->make_narrowoop()), this);
2848 } else if (t->isa_klassptr()) {
2849 n->subsume_by(ConNode::make(this, t->make_narrowklass()), this);
2850 }
2851 }
2852 if (in1->outcnt() == 0) {
2853 in1->disconnect_inputs(NULL, this);
2854 }
2855 break;
2856 }
2857
2858 case Op_Proj: {
2859 if (OptimizeStringConcat) {
2860 ProjNode* p = n->as_Proj();
2861 if (p->_is_io_use) {
2862 // Separate projections were used for the exception path which
2863 // are normally removed by a late inline. If it wasn't inlined
2864 // then they will hang around and should just be replaced with
2865 // the original one.
2866 Node* proj = NULL;
2867 // Replace with just one
2868 for (SimpleDUIterator i(p->in(0)); i.has_next(); i.next()) {
2869 Node *use = i.get();
2870 if (use->is_Proj() && p != use && use->as_Proj()->_con == p->_con) {
2871 proj = use;
2872 break;
2873 }
2874 }
2875 assert(proj != NULL, "must be found");
2876 p->subsume_by(proj, this);
2877 }
2878 }
2879 break;
2880 }
2881
2882 case Op_Phi:
2883 if (n->as_Phi()->bottom_type()->isa_narrowoop() || n->as_Phi()->bottom_type()->isa_narrowklass()) {
2884 // The EncodeP optimization may create Phi with the same edges
2885 // for all paths. It is not handled well by Register Allocator.
2886 Node* unique_in = n->in(1);
2887 assert(unique_in != NULL, "");
2888 uint cnt = n->req();
2889 for (uint i = 2; i < cnt; i++) {
2890 Node* m = n->in(i);
2891 assert(m != NULL, "");
2892 if (unique_in != m)
2893 unique_in = NULL;
2894 }
2895 if (unique_in != NULL) {
2896 n->subsume_by(unique_in, this);
2897 }
2898 }
2899 break;
2900
2901 #endif
2902
2903 case Op_ModI:
2904 if (UseDivMod) {
2905 // Check if a%b and a/b both exist
2906 Node* d = n->find_similar(Op_DivI);
2907 if (d) {
2908 // Replace them with a fused divmod if supported
2909 if (Matcher::has_match_rule(Op_DivModI)) {
2910 DivModINode* divmod = DivModINode::make(this, n);
2911 d->subsume_by(divmod->div_proj(), this);
2912 n->subsume_by(divmod->mod_proj(), this);
2913 } else {
2914 // replace a%b with a-((a/b)*b)
2915 Node* mult = new (this) MulINode(d, d->in(2));
2916 Node* sub = new (this) SubINode(d->in(1), mult);
2917 n->subsume_by(sub, this);
2918 }
2919 }
2920 }
2921 break;
2922
2923 case Op_ModL:
2924 if (UseDivMod) {
2925 // Check if a%b and a/b both exist
2926 Node* d = n->find_similar(Op_DivL);
2927 if (d) {
2928 // Replace them with a fused divmod if supported
2929 if (Matcher::has_match_rule(Op_DivModL)) {
2930 DivModLNode* divmod = DivModLNode::make(this, n);
2931 d->subsume_by(divmod->div_proj(), this);
2932 n->subsume_by(divmod->mod_proj(), this);
2933 } else {
2934 // replace a%b with a-((a/b)*b)
2935 Node* mult = new (this) MulLNode(d, d->in(2));
2936 Node* sub = new (this) SubLNode(d->in(1), mult);
2937 n->subsume_by(sub, this);
2938 }
2939 }
2940 }
2941 break;
2942
2943 case Op_LoadVector:
2944 case Op_StoreVector:
2945 break;
2946
2947 case Op_PackB:
2948 case Op_PackS:
2949 case Op_PackI:
2950 case Op_PackF:
2951 case Op_PackL:
2952 case Op_PackD:
2953 if (n->req()-1 > 2) {
2954 // Replace many operand PackNodes with a binary tree for matching
2955 PackNode* p = (PackNode*) n;
2956 Node* btp = p->binary_tree_pack(this, 1, n->req());
2957 n->subsume_by(btp, this);
2958 }
2959 break;
2960 case Op_Loop:
2961 case Op_CountedLoop:
2962 if (n->as_Loop()->is_inner_loop()) {
2963 frc.inc_inner_loop_count();
2964 }
2965 break;
2966 case Op_LShiftI:
2967 case Op_RShiftI:
2968 case Op_URShiftI:
2969 case Op_LShiftL:
2970 case Op_RShiftL:
2971 case Op_URShiftL:
2972 if (Matcher::need_masked_shift_count) {
2973 // The cpu's shift instructions don't restrict the count to the
2974 // lower 5/6 bits. We need to do the masking ourselves.
2975 Node* in2 = n->in(2);
2976 juint mask = (n->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1);
2977 const TypeInt* t = in2->find_int_type();
2978 if (t != NULL && t->is_con()) {
2979 juint shift = t->get_con();
2980 if (shift > mask) { // Unsigned cmp
2981 n->set_req(2, ConNode::make(this, TypeInt::make(shift & mask)));
2982 }
2983 } else {
2984 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) {
2985 Node* shift = new (this) AndINode(in2, ConNode::make(this, TypeInt::make(mask)));
2986 n->set_req(2, shift);
2987 }
2988 }
2989 if (in2->outcnt() == 0) { // Remove dead node
2990 in2->disconnect_inputs(NULL, this);
2991 }
2992 }
2993 break;
2994 case Op_MemBarStoreStore:
2995 case Op_MemBarRelease:
2996 // Break the link with AllocateNode: it is no longer useful and
2997 // confuses register allocation.
2998 if (n->req() > MemBarNode::Precedent) {
2999 n->set_req(MemBarNode::Precedent, top());
3000 }
3001 break;
3002 // Must set a control edge on all nodes that produce a FlagsProj
3003 // so they can't escape the block that consumes the flags.
3004 // Must also set the non throwing branch as the control
3005 // for all nodes that depends on the result. Unless the node
3006 // already have a control that isn't the control of the
3007 // flag producer
3008 case Op_FlagsProj:
3009 {
3010 MathExactNode* math = (MathExactNode*) n->in(0);
3011 Node* ctrl = math->control_node();
3012 Node* non_throwing = math->non_throwing_branch();
3013 math->set_req(0, ctrl);
3014
3015 Node* result = math->result_node();
3016 if (result != NULL) {
3017 for (DUIterator_Fast jmax, j = result->fast_outs(jmax); j < jmax; j++) {
3018 Node* out = result->fast_out(j);
3019 // Phi nodes shouldn't be moved. They would only match below if they
3020 // had the same control as the MathExactNode. The only time that
3021 // would happen is if the Phi is also an input to the MathExact
3022 //
3023 // Cmp nodes shouldn't have control set at all.
3024 if (out->is_Phi() ||
3025 out->is_Cmp()) {
3026 continue;
3027 }
3028
3029 if (out->in(0) == NULL) {
3030 out->set_req(0, non_throwing);
3031 } else if (out->in(0) == ctrl) {
3032 out->set_req(0, non_throwing);
3033 }
3034 }
3035 }
3036 }
3037 break;
3038 default:
3039 assert( !n->is_Call(), "" );
3040 assert( !n->is_Mem(), "" );
3041 break;
3042 }
3043
3044 // Collect CFG split points
3045 if (n->is_MultiBranch())
3046 frc._tests.push(n);
3047 }
3048
3049 //------------------------------final_graph_reshaping_walk---------------------
3050 // Replacing Opaque nodes with their input in final_graph_reshaping_impl(),
3051 // requires that the walk visits a node's inputs before visiting the node.
3052 void Compile::final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Reshape_Counts &frc ) {
3053 ResourceArea *area = Thread::current()->resource_area();
3054 Unique_Node_List sfpt(area);
3055
3056 frc._visited.set(root->_idx); // first, mark node as visited
3057 uint cnt = root->req();
3058 Node *n = root;
3059 uint i = 0;
3060 while (true) {
3061 if (i < cnt) {
3062 // Place all non-visited non-null inputs onto stack
3063 Node* m = n->in(i);
3064 ++i;
3065 if (m != NULL && !frc._visited.test_set(m->_idx)) {
3066 if (m->is_SafePoint() && m->as_SafePoint()->jvms() != NULL)
3067 sfpt.push(m);
3068 cnt = m->req();
3069 nstack.push(n, i); // put on stack parent and next input's index
3070 n = m;
3071 i = 0;
3072 }
3073 } else {
3074 // Now do post-visit work
3075 final_graph_reshaping_impl( n, frc );
3076 if (nstack.is_empty())
3077 break; // finished
3078 n = nstack.node(); // Get node from stack
3079 cnt = n->req();
3080 i = nstack.index();
3081 nstack.pop(); // Shift to the next node on stack
3082 }
3083 }
3084
3085 // Skip next transformation if compressed oops are not used.
3086 if ((UseCompressedOops && !Matcher::gen_narrow_oop_implicit_null_checks()) ||
3087 (!UseCompressedOops && !UseCompressedClassPointers))
3088 return;
3089
3090 // Go over safepoints nodes to skip DecodeN/DecodeNKlass nodes for debug edges.
3091 // It could be done for an uncommon traps or any safepoints/calls
3092 // if the DecodeN/DecodeNKlass node is referenced only in a debug info.
3093 while (sfpt.size() > 0) {
3094 n = sfpt.pop();
3095 JVMState *jvms = n->as_SafePoint()->jvms();
3096 assert(jvms != NULL, "sanity");
3097 int start = jvms->debug_start();
3098 int end = n->req();
3099 bool is_uncommon = (n->is_CallStaticJava() &&
3100 n->as_CallStaticJava()->uncommon_trap_request() != 0);
3101 for (int j = start; j < end; j++) {
3102 Node* in = n->in(j);
3103 if (in->is_DecodeNarrowPtr()) {
3104 bool safe_to_skip = true;
3105 if (!is_uncommon ) {
3106 // Is it safe to skip?
3107 for (uint i = 0; i < in->outcnt(); i++) {
3108 Node* u = in->raw_out(i);
3109 if (!u->is_SafePoint() ||
3110 u->is_Call() && u->as_Call()->has_non_debug_use(n)) {
3111 safe_to_skip = false;
3112 }
3113 }
3114 }
3115 if (safe_to_skip) {
3116 n->set_req(j, in->in(1));
3117 }
3118 if (in->outcnt() == 0) {
3119 in->disconnect_inputs(NULL, this);
3120 }
3121 }
3122 }
3123 }
3124 }
3125
3126 //------------------------------final_graph_reshaping--------------------------
3127 // Final Graph Reshaping.
3128 //
3129 // (1) Clone simple inputs to uncommon calls, so they can be scheduled late
3130 // and not commoned up and forced early. Must come after regular
3131 // optimizations to avoid GVN undoing the cloning. Clone constant
3132 // inputs to Loop Phis; these will be split by the allocator anyways.
3133 // Remove Opaque nodes.
3134 // (2) Move last-uses by commutative operations to the left input to encourage
3135 // Intel update-in-place two-address operations and better register usage
3136 // on RISCs. Must come after regular optimizations to avoid GVN Ideal
3137 // calls canonicalizing them back.
3138 // (3) Count the number of double-precision FP ops, single-precision FP ops
3139 // and call sites. On Intel, we can get correct rounding either by
3140 // forcing singles to memory (requires extra stores and loads after each
3141 // FP bytecode) or we can set a rounding mode bit (requires setting and
3142 // clearing the mode bit around call sites). The mode bit is only used
3143 // if the relative frequency of single FP ops to calls is low enough.
3144 // This is a key transform for SPEC mpeg_audio.
3145 // (4) Detect infinite loops; blobs of code reachable from above but not
3146 // below. Several of the Code_Gen algorithms fail on such code shapes,
3147 // so we simply bail out. Happens a lot in ZKM.jar, but also happens
3148 // from time to time in other codes (such as -Xcomp finalizer loops, etc).
3149 // Detection is by looking for IfNodes where only 1 projection is
3150 // reachable from below or CatchNodes missing some targets.
3151 // (5) Assert for insane oop offsets in debug mode.
3152
3153 bool Compile::final_graph_reshaping() {
3154 // an infinite loop may have been eliminated by the optimizer,
3155 // in which case the graph will be empty.
3156 if (root()->req() == 1) {
3157 record_method_not_compilable("trivial infinite loop");
3158 return true;
3159 }
3160
3161 // Expensive nodes have their control input set to prevent the GVN
3162 // from freely commoning them. There's no GVN beyond this point so
3163 // no need to keep the control input. We want the expensive nodes to
3164 // be freely moved to the least frequent code path by gcm.
3165 assert(OptimizeExpensiveOps || expensive_count() == 0, "optimization off but list non empty?");
3166 for (int i = 0; i < expensive_count(); i++) {
3167 _expensive_nodes->at(i)->set_req(0, NULL);
3168 }
3169
3170 Final_Reshape_Counts frc;
3171
3172 // Visit everybody reachable!
3173 // Allocate stack of size C->unique()/2 to avoid frequent realloc
3174 Node_Stack nstack(unique() >> 1);
3175 final_graph_reshaping_walk(nstack, root(), frc);
3176
3177 // Check for unreachable (from below) code (i.e., infinite loops).
3178 for( uint i = 0; i < frc._tests.size(); i++ ) {
3179 MultiBranchNode *n = frc._tests[i]->as_MultiBranch();
3180 // Get number of CFG targets.
3181 // Note that PCTables include exception targets after calls.
3182 uint required_outcnt = n->required_outcnt();
3183 if (n->outcnt() != required_outcnt) {
3184 // Check for a few special cases. Rethrow Nodes never take the
3185 // 'fall-thru' path, so expected kids is 1 less.
3186 if (n->is_PCTable() && n->in(0) && n->in(0)->in(0)) {
3187 if (n->in(0)->in(0)->is_Call()) {
3188 CallNode *call = n->in(0)->in(0)->as_Call();
3189 if (call->entry_point() == OptoRuntime::rethrow_stub()) {
3190 required_outcnt--; // Rethrow always has 1 less kid
3191 } else if (call->req() > TypeFunc::Parms &&
3192 call->is_CallDynamicJava()) {
3193 // Check for null receiver. In such case, the optimizer has
3194 // detected that the virtual call will always result in a null
3195 // pointer exception. The fall-through projection of this CatchNode
3196 // will not be populated.
3197 Node *arg0 = call->in(TypeFunc::Parms);
3198 if (arg0->is_Type() &&
3199 arg0->as_Type()->type()->higher_equal(TypePtr::NULL_PTR)) {
3200 required_outcnt--;
3201 }
3202 } else if (call->entry_point() == OptoRuntime::new_array_Java() &&
3203 call->req() > TypeFunc::Parms+1 &&
3204 call->is_CallStaticJava()) {
3205 // Check for negative array length. In such case, the optimizer has
3206 // detected that the allocation attempt will always result in an
3207 // exception. There is no fall-through projection of this CatchNode .
3208 Node *arg1 = call->in(TypeFunc::Parms+1);
3209 if (arg1->is_Type() &&
3210 arg1->as_Type()->type()->join(TypeInt::POS)->empty()) {
3211 required_outcnt--;
3212 }
3213 }
3214 }
3215 }
3216 // Recheck with a better notion of 'required_outcnt'
3217 if (n->outcnt() != required_outcnt) {
3218 record_method_not_compilable("malformed control flow");
3219 return true; // Not all targets reachable!
3220 }
3221 }
3222 // Check that I actually visited all kids. Unreached kids
3223 // must be infinite loops.
3224 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++)
3225 if (!frc._visited.test(n->fast_out(j)->_idx)) {
3226 record_method_not_compilable("infinite loop");
3227 return true; // Found unvisited kid; must be unreach
3228 }
3229 }
3230
3231 // If original bytecodes contained a mixture of floats and doubles
3232 // check if the optimizer has made it homogenous, item (3).
3233 if( Use24BitFPMode && Use24BitFP && UseSSE == 0 &&
3234 frc.get_float_count() > 32 &&
3235 frc.get_double_count() == 0 &&
3236 (10 * frc.get_call_count() < frc.get_float_count()) ) {
3237 set_24_bit_selection_and_mode( false, true );
3238 }
3239
3240 set_java_calls(frc.get_java_call_count());
3241 set_inner_loops(frc.get_inner_loop_count());
3242
3243 // No infinite loops, no reason to bail out.
3244 return false;
3245 }
3246
3247 //-----------------------------too_many_traps----------------------------------
3248 // Report if there are too many traps at the current method and bci.
3249 // Return true if there was a trap, and/or PerMethodTrapLimit is exceeded.
3250 bool Compile::too_many_traps(ciMethod* method,
3251 int bci,
3252 Deoptimization::DeoptReason reason) {
3253 ciMethodData* md = method->method_data();
3254 if (md->is_empty()) {
3255 // Assume the trap has not occurred, or that it occurred only
3256 // because of a transient condition during start-up in the interpreter.
3257 return false;
3258 }
3259 if (md->has_trap_at(bci, reason) != 0) {
3260 // Assume PerBytecodeTrapLimit==0, for a more conservative heuristic.
3261 // Also, if there are multiple reasons, or if there is no per-BCI record,
3262 // assume the worst.
3263 if (log())
3264 log()->elem("observe trap='%s' count='%d'",
3265 Deoptimization::trap_reason_name(reason),
3266 md->trap_count(reason));
3267 return true;
3268 } else {
3269 // Ignore method/bci and see if there have been too many globally.
3270 return too_many_traps(reason, md);
3271 }
3272 }
3273
3274 // Less-accurate variant which does not require a method and bci.
3275 bool Compile::too_many_traps(Deoptimization::DeoptReason reason,
3276 ciMethodData* logmd) {
3277 if (trap_count(reason) >= (uint)PerMethodTrapLimit) {
3278 // Too many traps globally.
3279 // Note that we use cumulative trap_count, not just md->trap_count.
3280 if (log()) {
3281 int mcount = (logmd == NULL)? -1: (int)logmd->trap_count(reason);
3282 log()->elem("observe trap='%s' count='0' mcount='%d' ccount='%d'",
3283 Deoptimization::trap_reason_name(reason),
3284 mcount, trap_count(reason));
3285 }
3286 return true;
3287 } else {
3288 // The coast is clear.
3289 return false;
3290 }
3291 }
3292
3293 //--------------------------too_many_recompiles--------------------------------
3294 // Report if there are too many recompiles at the current method and bci.
3295 // Consults PerBytecodeRecompilationCutoff and PerMethodRecompilationCutoff.
3296 // Is not eager to return true, since this will cause the compiler to use
3297 // Action_none for a trap point, to avoid too many recompilations.
3298 bool Compile::too_many_recompiles(ciMethod* method,
3299 int bci,
3300 Deoptimization::DeoptReason reason) {
3301 ciMethodData* md = method->method_data();
3302 if (md->is_empty()) {
3303 // Assume the trap has not occurred, or that it occurred only
3304 // because of a transient condition during start-up in the interpreter.
3305 return false;
3306 }
3307 // Pick a cutoff point well within PerBytecodeRecompilationCutoff.
3308 uint bc_cutoff = (uint) PerBytecodeRecompilationCutoff / 8;
3309 uint m_cutoff = (uint) PerMethodRecompilationCutoff / 2 + 1; // not zero
3310 Deoptimization::DeoptReason per_bc_reason
3311 = Deoptimization::reason_recorded_per_bytecode_if_any(reason);
3312 if ((per_bc_reason == Deoptimization::Reason_none
3313 || md->has_trap_at(bci, reason) != 0)
3314 // The trap frequency measure we care about is the recompile count:
3315 && md->trap_recompiled_at(bci)
3316 && md->overflow_recompile_count() >= bc_cutoff) {
3317 // Do not emit a trap here if it has already caused recompilations.
3318 // Also, if there are multiple reasons, or if there is no per-BCI record,
3319 // assume the worst.
3320 if (log())
3321 log()->elem("observe trap='%s recompiled' count='%d' recompiles2='%d'",
3322 Deoptimization::trap_reason_name(reason),
3323 md->trap_count(reason),
3324 md->overflow_recompile_count());
3325 return true;
3326 } else if (trap_count(reason) != 0
3327 && decompile_count() >= m_cutoff) {
3328 // Too many recompiles globally, and we have seen this sort of trap.
3329 // Use cumulative decompile_count, not just md->decompile_count.
3330 if (log())
3331 log()->elem("observe trap='%s' count='%d' mcount='%d' decompiles='%d' mdecompiles='%d'",
3332 Deoptimization::trap_reason_name(reason),
3333 md->trap_count(reason), trap_count(reason),
3334 md->decompile_count(), decompile_count());
3335 return true;
3336 } else {
3337 // The coast is clear.
3338 return false;
3339 }
3340 }
3341
3342
3343 #ifndef PRODUCT
3344 //------------------------------verify_graph_edges---------------------------
3345 // Walk the Graph and verify that there is a one-to-one correspondence
3346 // between Use-Def edges and Def-Use edges in the graph.
3347 void Compile::verify_graph_edges(bool no_dead_code) {
3348 if (VerifyGraphEdges) {
3349 ResourceArea *area = Thread::current()->resource_area();
3350 Unique_Node_List visited(area);
3351 // Call recursive graph walk to check edges
3352 _root->verify_edges(visited);
3353 if (no_dead_code) {
3354 // Now make sure that no visited node is used by an unvisited node.
3355 bool dead_nodes = 0;
3356 Unique_Node_List checked(area);
3357 while (visited.size() > 0) {
3358 Node* n = visited.pop();
3359 checked.push(n);
3360 for (uint i = 0; i < n->outcnt(); i++) {
3361 Node* use = n->raw_out(i);
3362 if (checked.member(use)) continue; // already checked
3363 if (visited.member(use)) continue; // already in the graph
3364 if (use->is_Con()) continue; // a dead ConNode is OK
3365 // At this point, we have found a dead node which is DU-reachable.
3366 if (dead_nodes++ == 0)
3367 tty->print_cr("*** Dead nodes reachable via DU edges:");
3368 use->dump(2);
3369 tty->print_cr("---");
3370 checked.push(use); // No repeats; pretend it is now checked.
3371 }
3372 }
3373 assert(dead_nodes == 0, "using nodes must be reachable from root");
3374 }
3375 }
3376 }
3377
3378 // Verify GC barriers consistency
3379 // Currently supported:
3380 // - G1 pre-barriers (see GraphKit::g1_write_barrier_pre())
3381 void Compile::verify_barriers() {
3382 if (UseG1GC) {
3383 // Verify G1 pre-barriers
3384 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + PtrQueue::byte_offset_of_active());
3385
3386 ResourceArea *area = Thread::current()->resource_area();
3387 Unique_Node_List visited(area);
3388 Node_List worklist(area);
3389 // We're going to walk control flow backwards starting from the Root
3390 worklist.push(_root);
3391 while (worklist.size() > 0) {
3392 Node* x = worklist.pop();
3393 if (x == NULL || x == top()) continue;
3394 if (visited.member(x)) {
3395 continue;
3396 } else {
3397 visited.push(x);
3398 }
3399
3400 if (x->is_Region()) {
3401 for (uint i = 1; i < x->req(); i++) {
3402 worklist.push(x->in(i));
3403 }
3404 } else {
3405 worklist.push(x->in(0));
3406 // We are looking for the pattern:
3407 // /->ThreadLocal
3408 // If->Bool->CmpI->LoadB->AddP->ConL(marking_offset)
3409 // \->ConI(0)
3410 // We want to verify that the If and the LoadB have the same control
3411 // See GraphKit::g1_write_barrier_pre()
3412 if (x->is_If()) {
3413 IfNode *iff = x->as_If();
3414 if (iff->in(1)->is_Bool() && iff->in(1)->in(1)->is_Cmp()) {
3415 CmpNode *cmp = iff->in(1)->in(1)->as_Cmp();
3416 if (cmp->Opcode() == Op_CmpI && cmp->in(2)->is_Con() && cmp->in(2)->bottom_type()->is_int()->get_con() == 0
3417 && cmp->in(1)->is_Load()) {
3418 LoadNode* load = cmp->in(1)->as_Load();
3419 if (load->Opcode() == Op_LoadB && load->in(2)->is_AddP() && load->in(2)->in(2)->Opcode() == Op_ThreadLocal
3420 && load->in(2)->in(3)->is_Con()
3421 && load->in(2)->in(3)->bottom_type()->is_intptr_t()->get_con() == marking_offset) {
3422
3423 Node* if_ctrl = iff->in(0);
3424 Node* load_ctrl = load->in(0);
3425
3426 if (if_ctrl != load_ctrl) {
3427 // Skip possible CProj->NeverBranch in infinite loops
3428 if ((if_ctrl->is_Proj() && if_ctrl->Opcode() == Op_CProj)
3429 && (if_ctrl->in(0)->is_MultiBranch() && if_ctrl->in(0)->Opcode() == Op_NeverBranch)) {
3430 if_ctrl = if_ctrl->in(0)->in(0);
3431 }
3432 }
3433 assert(load_ctrl != NULL && if_ctrl == load_ctrl, "controls must match");
3434 }
3435 }
3436 }
3437 }
3438 }
3439 }
3440 }
3441 }
3442
3443 #endif
3444
3445 // The Compile object keeps track of failure reasons separately from the ciEnv.
3446 // This is required because there is not quite a 1-1 relation between the
3447 // ciEnv and its compilation task and the Compile object. Note that one
3448 // ciEnv might use two Compile objects, if C2Compiler::compile_method decides
3449 // to backtrack and retry without subsuming loads. Other than this backtracking
3450 // behavior, the Compile's failure reason is quietly copied up to the ciEnv
3451 // by the logic in C2Compiler.
3452 void Compile::record_failure(const char* reason) {
3453 if (log() != NULL) {
3454 log()->elem("failure reason='%s' phase='compile'", reason);
3455 }
3456 if (_failure_reason == NULL) {
3457 // Record the first failure reason.
3458 _failure_reason = reason;
3459 }
3460
3461 EventCompilerFailure event;
3462 if (event.should_commit()) {
3463 event.set_compileID(Compile::compile_id());
3464 event.set_failure(reason);
3465 event.commit();
3466 }
3467
3468 if (!C->failure_reason_is(C2Compiler::retry_no_subsuming_loads())) {
3469 C->print_method(PHASE_FAILURE);
3470 }
3471 _root = NULL; // flush the graph, too
3472 }
3473
3474 Compile::TracePhase::TracePhase(const char* name, elapsedTimer* accumulator, bool dolog)
3475 : TraceTime(NULL, accumulator, false NOT_PRODUCT( || TimeCompiler ), false),
3476 _phase_name(name), _dolog(dolog)
3477 {
3478 if (dolog) {
3479 C = Compile::current();
3480 _log = C->log();
3481 } else {
3482 C = NULL;
3483 _log = NULL;
3484 }
3485 if (_log != NULL) {
3486 _log->begin_head("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes());
3487 _log->stamp();
3488 _log->end_head();
3489 }
3490 }
3491
3492 Compile::TracePhase::~TracePhase() {
3493
3494 C = Compile::current();
3495 if (_dolog) {
3496 _log = C->log();
3497 } else {
3498 _log = NULL;
3499 }
3500
3501 #ifdef ASSERT
3502 if (PrintIdealNodeCount) {
3503 tty->print_cr("phase name='%s' nodes='%d' live='%d' live_graph_walk='%d'",
3504 _phase_name, C->unique(), C->live_nodes(), C->count_live_nodes_by_graph_walk());
3505 }
3506
3507 if (VerifyIdealNodeCount) {
3508 Compile::current()->print_missing_nodes();
3509 }
3510 #endif
3511
3512 if (_log != NULL) {
3513 _log->done("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes());
3514 }
3515 }
3516
3517 //=============================================================================
3518 // Two Constant's are equal when the type and the value are equal.
3519 bool Compile::Constant::operator==(const Constant& other) {
3520 if (type() != other.type() ) return false;
3521 if (can_be_reused() != other.can_be_reused()) return false;
3522 // For floating point values we compare the bit pattern.
3523 switch (type()) {
3524 case T_FLOAT: return (_v._value.i == other._v._value.i);
3525 case T_LONG:
3526 case T_DOUBLE: return (_v._value.j == other._v._value.j);
3527 case T_OBJECT:
3528 case T_ADDRESS: return (_v._value.l == other._v._value.l);
3529 case T_VOID: return (_v._value.l == other._v._value.l); // jump-table entries
3530 case T_METADATA: return (_v._metadata == other._v._metadata);
3531 default: ShouldNotReachHere();
3532 }
3533 return false;
3534 }
3535
3536 static int type_to_size_in_bytes(BasicType t) {
3537 switch (t) {
3538 case T_LONG: return sizeof(jlong );
3539 case T_FLOAT: return sizeof(jfloat );
3540 case T_DOUBLE: return sizeof(jdouble);
3541 case T_METADATA: return sizeof(Metadata*);
3542 // We use T_VOID as marker for jump-table entries (labels) which
3543 // need an internal word relocation.
3544 case T_VOID:
3545 case T_ADDRESS:
3546 case T_OBJECT: return sizeof(jobject);
3547 }
3548
3549 ShouldNotReachHere();
3550 return -1;
3551 }
3552
3553 int Compile::ConstantTable::qsort_comparator(Constant* a, Constant* b) {
3554 // sort descending
3555 if (a->freq() > b->freq()) return -1;
3556 if (a->freq() < b->freq()) return 1;
3557 return 0;
3558 }
3559
3560 void Compile::ConstantTable::calculate_offsets_and_size() {
3561 // First, sort the array by frequencies.
3562 _constants.sort(qsort_comparator);
3563
3564 #ifdef ASSERT
3565 // Make sure all jump-table entries were sorted to the end of the
3566 // array (they have a negative frequency).
3567 bool found_void = false;
3568 for (int i = 0; i < _constants.length(); i++) {
3569 Constant con = _constants.at(i);
3570 if (con.type() == T_VOID)
3571 found_void = true; // jump-tables
3572 else
3573 assert(!found_void, "wrong sorting");
3574 }
3575 #endif
3576
3577 int offset = 0;
3578 for (int i = 0; i < _constants.length(); i++) {
3579 Constant* con = _constants.adr_at(i);
3580
3581 // Align offset for type.
3582 int typesize = type_to_size_in_bytes(con->type());
3583 offset = align_size_up(offset, typesize);
3584 con->set_offset(offset); // set constant's offset
3585
3586 if (con->type() == T_VOID) {
3587 MachConstantNode* n = (MachConstantNode*) con->get_jobject();
3588 offset = offset + typesize * n->outcnt(); // expand jump-table
3589 } else {
3590 offset = offset + typesize;
3591 }
3592 }
3593
3594 // Align size up to the next section start (which is insts; see
3595 // CodeBuffer::align_at_start).
3596 assert(_size == -1, "already set?");
3597 _size = align_size_up(offset, CodeEntryAlignment);
3598 }
3599
3600 void Compile::ConstantTable::emit(CodeBuffer& cb) {
3601 MacroAssembler _masm(&cb);
3602 for (int i = 0; i < _constants.length(); i++) {
3603 Constant con = _constants.at(i);
3604 address constant_addr;
3605 switch (con.type()) {
3606 case T_LONG: constant_addr = _masm.long_constant( con.get_jlong() ); break;
3607 case T_FLOAT: constant_addr = _masm.float_constant( con.get_jfloat() ); break;
3608 case T_DOUBLE: constant_addr = _masm.double_constant(con.get_jdouble()); break;
3609 case T_OBJECT: {
3610 jobject obj = con.get_jobject();
3611 int oop_index = _masm.oop_recorder()->find_index(obj);
3612 constant_addr = _masm.address_constant((address) obj, oop_Relocation::spec(oop_index));
3613 break;
3614 }
3615 case T_ADDRESS: {
3616 address addr = (address) con.get_jobject();
3617 constant_addr = _masm.address_constant(addr);
3618 break;
3619 }
3620 // We use T_VOID as marker for jump-table entries (labels) which
3621 // need an internal word relocation.
3622 case T_VOID: {
3623 MachConstantNode* n = (MachConstantNode*) con.get_jobject();
3624 // Fill the jump-table with a dummy word. The real value is
3625 // filled in later in fill_jump_table.
3626 address dummy = (address) n;
3627 constant_addr = _masm.address_constant(dummy);
3628 // Expand jump-table
3629 for (uint i = 1; i < n->outcnt(); i++) {
3630 address temp_addr = _masm.address_constant(dummy + i);
3631 assert(temp_addr, "consts section too small");
3632 }
3633 break;
3634 }
3635 case T_METADATA: {
3636 Metadata* obj = con.get_metadata();
3637 int metadata_index = _masm.oop_recorder()->find_index(obj);
3638 constant_addr = _masm.address_constant((address) obj, metadata_Relocation::spec(metadata_index));
3639 break;
3640 }
3641 default: ShouldNotReachHere();
3642 }
3643 assert(constant_addr, "consts section too small");
3644 assert((constant_addr - _masm.code()->consts()->start()) == con.offset(), err_msg_res("must be: %d == %d", constant_addr - _masm.code()->consts()->start(), con.offset()));
3645 }
3646 }
3647
3648 int Compile::ConstantTable::find_offset(Constant& con) const {
3649 int idx = _constants.find(con);
3650 assert(idx != -1, "constant must be in constant table");
3651 int offset = _constants.at(idx).offset();
3652 assert(offset != -1, "constant table not emitted yet?");
3653 return offset;
3654 }
3655
3656 void Compile::ConstantTable::add(Constant& con) {
3657 if (con.can_be_reused()) {
3658 int idx = _constants.find(con);
3659 if (idx != -1 && _constants.at(idx).can_be_reused()) {
3660 _constants.adr_at(idx)->inc_freq(con.freq()); // increase the frequency by the current value
3661 return;
3662 }
3663 }
3664 (void) _constants.append(con);
3665 }
3666
3667 Compile::Constant Compile::ConstantTable::add(MachConstantNode* n, BasicType type, jvalue value) {
3668 Block* b = Compile::current()->cfg()->get_block_for_node(n);
3669 Constant con(type, value, b->_freq);
3670 add(con);
3671 return con;
3672 }
3673
3674 Compile::Constant Compile::ConstantTable::add(Metadata* metadata) {
3675 Constant con(metadata);
3676 add(con);
3677 return con;
3678 }
3679
3680 Compile::Constant Compile::ConstantTable::add(MachConstantNode* n, MachOper* oper) {
3681 jvalue value;
3682 BasicType type = oper->type()->basic_type();
3683 switch (type) {
3684 case T_LONG: value.j = oper->constantL(); break;
3685 case T_FLOAT: value.f = oper->constantF(); break;
3686 case T_DOUBLE: value.d = oper->constantD(); break;
3687 case T_OBJECT:
3688 case T_ADDRESS: value.l = (jobject) oper->constant(); break;
3689 case T_METADATA: return add((Metadata*)oper->constant()); break;
3690 default: guarantee(false, err_msg_res("unhandled type: %s", type2name(type)));
3691 }
3692 return add(n, type, value);
3693 }
3694
3695 Compile::Constant Compile::ConstantTable::add_jump_table(MachConstantNode* n) {
3696 jvalue value;
3697 // We can use the node pointer here to identify the right jump-table
3698 // as this method is called from Compile::Fill_buffer right before
3699 // the MachNodes are emitted and the jump-table is filled (means the
3700 // MachNode pointers do not change anymore).
3701 value.l = (jobject) n;
3702 Constant con(T_VOID, value, next_jump_table_freq(), false); // Labels of a jump-table cannot be reused.
3703 add(con);
3704 return con;
3705 }
3706
3707 void Compile::ConstantTable::fill_jump_table(CodeBuffer& cb, MachConstantNode* n, GrowableArray<Label*> labels) const {
3708 // If called from Compile::scratch_emit_size do nothing.
3709 if (Compile::current()->in_scratch_emit_size()) return;
3710
3711 assert(labels.is_nonempty(), "must be");
3712 assert((uint) labels.length() == n->outcnt(), err_msg_res("must be equal: %d == %d", labels.length(), n->outcnt()));
3713
3714 // Since MachConstantNode::constant_offset() also contains
3715 // table_base_offset() we need to subtract the table_base_offset()
3716 // to get the plain offset into the constant table.
3717 int offset = n->constant_offset() - table_base_offset();
3718
3719 MacroAssembler _masm(&cb);
3720 address* jump_table_base = (address*) (_masm.code()->consts()->start() + offset);
3721
3722 for (uint i = 0; i < n->outcnt(); i++) {
3723 address* constant_addr = &jump_table_base[i];
3724 assert(*constant_addr == (((address) n) + i), err_msg_res("all jump-table entries must contain adjusted node pointer: " INTPTR_FORMAT " == " INTPTR_FORMAT, *constant_addr, (((address) n) + i)));
3725 *constant_addr = cb.consts()->target(*labels.at(i), (address) constant_addr);
3726 cb.consts()->relocate((address) constant_addr, relocInfo::internal_word_type);
3727 }
3728 }
3729
3730 void Compile::dump_inlining() {
3731 if (print_inlining() || print_intrinsics()) {
3732 // Print inlining message for candidates that we couldn't inline
3733 // for lack of space or non constant receiver
3734 for (int i = 0; i < _late_inlines.length(); i++) {
3735 CallGenerator* cg = _late_inlines.at(i);
3736 cg->print_inlining_late("live nodes > LiveNodeCountInliningCutoff");
3737 }
3738 Unique_Node_List useful;
3739 useful.push(root());
3740 for (uint next = 0; next < useful.size(); ++next) {
3741 Node* n = useful.at(next);
3742 if (n->is_Call() && n->as_Call()->generator() != NULL && n->as_Call()->generator()->call_node() == n) {
3743 CallNode* call = n->as_Call();
3744 CallGenerator* cg = call->generator();
3745 cg->print_inlining_late("receiver not constant");
3746 }
3747 uint max = n->len();
3748 for ( uint i = 0; i < max; ++i ) {
3749 Node *m = n->in(i);
3750 if ( m == NULL ) continue;
3751 useful.push(m);
3752 }
3753 }
3754 for (int i = 0; i < _print_inlining_list->length(); i++) {
3755 tty->print(_print_inlining_list->adr_at(i)->ss()->as_string());
3756 }
3757 }
3758 }
3759
3760 int Compile::cmp_expensive_nodes(Node* n1, Node* n2) {
3761 if (n1->Opcode() < n2->Opcode()) return -1;
3762 else if (n1->Opcode() > n2->Opcode()) return 1;
3763
3764 assert(n1->req() == n2->req(), err_msg_res("can't compare %s nodes: n1->req() = %d, n2->req() = %d", NodeClassNames[n1->Opcode()], n1->req(), n2->req()));
3765 for (uint i = 1; i < n1->req(); i++) {
3766 if (n1->in(i) < n2->in(i)) return -1;
3767 else if (n1->in(i) > n2->in(i)) return 1;
3768 }
3769
3770 return 0;
3771 }
3772
3773 int Compile::cmp_expensive_nodes(Node** n1p, Node** n2p) {
3774 Node* n1 = *n1p;
3775 Node* n2 = *n2p;
3776
3777 return cmp_expensive_nodes(n1, n2);
3778 }
3779
3780 void Compile::sort_expensive_nodes() {
3781 if (!expensive_nodes_sorted()) {
3782 _expensive_nodes->sort(cmp_expensive_nodes);
3783 }
3784 }
3785
3786 bool Compile::expensive_nodes_sorted() const {
3787 for (int i = 1; i < _expensive_nodes->length(); i++) {
3788 if (cmp_expensive_nodes(_expensive_nodes->adr_at(i), _expensive_nodes->adr_at(i-1)) < 0) {
3789 return false;
3790 }
3791 }
3792 return true;
3793 }
3794
3795 bool Compile::should_optimize_expensive_nodes(PhaseIterGVN &igvn) {
3796 if (_expensive_nodes->length() == 0) {
3797 return false;
3798 }
3799
3800 assert(OptimizeExpensiveOps, "optimization off?");
3801
3802 // Take this opportunity to remove dead nodes from the list
3803 int j = 0;
3804 for (int i = 0; i < _expensive_nodes->length(); i++) {
3805 Node* n = _expensive_nodes->at(i);
3806 if (!n->is_unreachable(igvn)) {
3807 assert(n->is_expensive(), "should be expensive");
3808 _expensive_nodes->at_put(j, n);
3809 j++;
3810 }
3811 }
3812 _expensive_nodes->trunc_to(j);
3813
3814 // Then sort the list so that similar nodes are next to each other
3815 // and check for at least two nodes of identical kind with same data
3816 // inputs.
3817 sort_expensive_nodes();
3818
3819 for (int i = 0; i < _expensive_nodes->length()-1; i++) {
3820 if (cmp_expensive_nodes(_expensive_nodes->adr_at(i), _expensive_nodes->adr_at(i+1)) == 0) {
3821 return true;
3822 }
3823 }
3824
3825 return false;
3826 }
3827
3828 void Compile::cleanup_expensive_nodes(PhaseIterGVN &igvn) {
3829 if (_expensive_nodes->length() == 0) {
3830 return;
3831 }
3832
3833 assert(OptimizeExpensiveOps, "optimization off?");
3834
3835 // Sort to bring similar nodes next to each other and clear the
3836 // control input of nodes for which there's only a single copy.
3837 sort_expensive_nodes();
3838
3839 int j = 0;
3840 int identical = 0;
3841 int i = 0;
3842 for (; i < _expensive_nodes->length()-1; i++) {
3843 assert(j <= i, "can't write beyond current index");
3844 if (_expensive_nodes->at(i)->Opcode() == _expensive_nodes->at(i+1)->Opcode()) {
3845 identical++;
3846 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
3847 continue;
3848 }
3849 if (identical > 0) {
3850 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
3851 identical = 0;
3852 } else {
3853 Node* n = _expensive_nodes->at(i);
3854 igvn.hash_delete(n);
3855 n->set_req(0, NULL);
3856 igvn.hash_insert(n);
3857 }
3858 }
3859 if (identical > 0) {
3860 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
3861 } else if (_expensive_nodes->length() >= 1) {
3862 Node* n = _expensive_nodes->at(i);
3863 igvn.hash_delete(n);
3864 n->set_req(0, NULL);
3865 igvn.hash_insert(n);
3866 }
3867 _expensive_nodes->trunc_to(j);
3868 }
3869
3870 void Compile::add_expensive_node(Node * n) {
3871 assert(!_expensive_nodes->contains(n), "duplicate entry in expensive list");
3872 assert(n->is_expensive(), "expensive nodes with non-null control here only");
3873 assert(!n->is_CFG() && !n->is_Mem(), "no cfg or memory nodes here");
3874 if (OptimizeExpensiveOps) {
3875 _expensive_nodes->append(n);
3876 } else {
3877 // Clear control input and let IGVN optimize expensive nodes if
3878 // OptimizeExpensiveOps is off.
3879 n->set_req(0, NULL);
3880 }
3881 }
3882
3883 /**
3884 * Remove the speculative part of types and clean up the graph
3885 */
3886 void Compile::remove_speculative_types(PhaseIterGVN &igvn) {
3887 if (UseTypeSpeculation) {
3888 Unique_Node_List worklist;
3889 worklist.push(root());
3890 int modified = 0;
3891 // Go over all type nodes that carry a speculative type, drop the
3892 // speculative part of the type and enqueue the node for an igvn
3893 // which may optimize it out.
3894 for (uint next = 0; next < worklist.size(); ++next) {
3895 Node *n = worklist.at(next);
3896 if (n->is_Type() && n->as_Type()->type()->isa_oopptr() != NULL &&
3897 n->as_Type()->type()->is_oopptr()->speculative() != NULL) {
3898 TypeNode* tn = n->as_Type();
3899 const TypeOopPtr* t = tn->type()->is_oopptr();
3900 bool in_hash = igvn.hash_delete(n);
3901 assert(in_hash, "node should be in igvn hash table");
3902 tn->set_type(t->remove_speculative());
3903 igvn.hash_insert(n);
3904 igvn._worklist.push(n); // give it a chance to go away
3905 modified++;
3906 }
3907 uint max = n->len();
3908 for( uint i = 0; i < max; ++i ) {
3909 Node *m = n->in(i);
3910 if (not_a_node(m)) continue;
3911 worklist.push(m);
3912 }
3913 }
3914 // Drop the speculative part of all types in the igvn's type table
3915 igvn.remove_speculative_types();
3916 if (modified > 0) {
3917 igvn.optimize();
3918 }
3919 }
3920 }
3921
3922 // Auxiliary method to support randomized stressing/fuzzing.
3923 //
3924 // This method can be called the arbitrary number of times, with current count
3925 // as the argument. The logic allows selecting a single candidate from the
3926 // running list of candidates as follows:
3927 // int count = 0;
3928 // Cand* selected = null;
3929 // while(cand = cand->next()) {
3930 // if (randomized_select(++count)) {
3931 // selected = cand;
3932 // }
3933 // }
3934 //
3935 // Including count equalizes the chances any candidate is "selected".
3936 // This is useful when we don't have the complete list of candidates to choose
3937 // from uniformly. In this case, we need to adjust the randomicity of the
3938 // selection, or else we will end up biasing the selection towards the latter
3939 // candidates.
3940 //
3941 // Quick back-envelope calculation shows that for the list of n candidates
3942 // the equal probability for the candidate to persist as "best" can be
3943 // achieved by replacing it with "next" k-th candidate with the probability
3944 // of 1/k. It can be easily shown that by the end of the run, the
3945 // probability for any candidate is converged to 1/n, thus giving the
3946 // uniform distribution among all the candidates.
3947 //
3948 // We don't care about the domain size as long as (RANDOMIZED_DOMAIN / count) is large.
3949 #define RANDOMIZED_DOMAIN_POW 29
3950 #define RANDOMIZED_DOMAIN (1 << RANDOMIZED_DOMAIN_POW)
3951 #define RANDOMIZED_DOMAIN_MASK ((1 << (RANDOMIZED_DOMAIN_POW + 1)) - 1)
3952 bool Compile::randomized_select(int count) {
3953 assert(count > 0, "only positive");
3954 return (os::random() & RANDOMIZED_DOMAIN_MASK) < (RANDOMIZED_DOMAIN / count);
3955 }