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 "ci/ciReplay.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "code/exceptionHandlerTable.hpp"
31 #include "code/nmethod.hpp"
32 #include "compiler/compileLog.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "opto/addnode.hpp"
36 #include "opto/block.hpp"
37 #include "opto/c2compiler.hpp"
38 #include "opto/callGenerator.hpp"
39 #include "opto/callnode.hpp"
40 #include "opto/cfgnode.hpp"
41 #include "opto/chaitin.hpp"
42 #include "opto/compile.hpp"
43 #include "opto/connode.hpp"
44 #include "opto/divnode.hpp"
45 #include "opto/escape.hpp"
46 #include "opto/idealGraphPrinter.hpp"
47 #include "opto/loopnode.hpp"
48 #include "opto/machnode.hpp"
49 #include "opto/macro.hpp"
50 #include "opto/matcher.hpp"
51 #include "opto/mathexactnode.hpp"
52 #include "opto/memnode.hpp"
53 #include "opto/mulnode.hpp"
54 #include "opto/node.hpp"
55 #include "opto/opcodes.hpp"
56 #include "opto/output.hpp"
57 #include "opto/parse.hpp"
58 #include "opto/phaseX.hpp"
59 #include "opto/rootnode.hpp"
60 #include "opto/runtime.hpp"
61 #include "opto/stringopts.hpp"
62 #include "opto/type.hpp"
63 #include "opto/vectornode.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/signature.hpp"
66 #include "runtime/stubRoutines.hpp"
67 #include "runtime/timer.hpp"
68 #include "trace/tracing.hpp"
69 #include "utilities/copy.hpp"
70 #ifdef TARGET_ARCH_MODEL_x86_32
71 # include "adfiles/ad_x86_32.hpp"
72 #endif
73 #ifdef TARGET_ARCH_MODEL_x86_64
74 # include "adfiles/ad_x86_64.hpp"
75 #endif
76 #ifdef TARGET_ARCH_MODEL_sparc
77 # include "adfiles/ad_sparc.hpp"
78 #endif
79 #ifdef TARGET_ARCH_MODEL_zero
80 # include "adfiles/ad_zero.hpp"
81 #endif
82 #ifdef TARGET_ARCH_MODEL_arm
83 # include "adfiles/ad_arm.hpp"
84 #endif
85 #ifdef TARGET_ARCH_MODEL_ppc_32
86 # include "adfiles/ad_ppc_32.hpp"
87 #endif
88 #ifdef TARGET_ARCH_MODEL_ppc_64
89 # include "adfiles/ad_ppc_64.hpp"
90 #endif
91
92
93 // -------------------- Compile::mach_constant_base_node -----------------------
94 // Constant table base node singleton.
95 MachConstantBaseNode* Compile::mach_constant_base_node() {
96 if (_mach_constant_base_node == NULL) {
97 _mach_constant_base_node = new (C) MachConstantBaseNode();
98 _mach_constant_base_node->add_req(C->root());
99 }
100 return _mach_constant_base_node;
101 }
102
103
104 /// Support for intrinsics.
105
106 // Return the index at which m must be inserted (or already exists).
107 // The sort order is by the address of the ciMethod, with is_virtual as minor key.
108 int Compile::intrinsic_insertion_index(ciMethod* m, bool is_virtual) {
109 #ifdef ASSERT
110 for (int i = 1; i < _intrinsics->length(); i++) {
111 CallGenerator* cg1 = _intrinsics->at(i-1);
112 CallGenerator* cg2 = _intrinsics->at(i);
113 assert(cg1->method() != cg2->method()
114 ? cg1->method() < cg2->method()
115 : cg1->is_virtual() < cg2->is_virtual(),
116 "compiler intrinsics list must stay sorted");
117 }
118 #endif
119 // Binary search sorted list, in decreasing intervals [lo, hi].
120 int lo = 0, hi = _intrinsics->length()-1;
121 while (lo <= hi) {
122 int mid = (uint)(hi + lo) / 2;
123 ciMethod* mid_m = _intrinsics->at(mid)->method();
124 if (m < mid_m) {
125 hi = mid-1;
126 } else if (m > mid_m) {
127 lo = mid+1;
128 } else {
129 // look at minor sort key
130 bool mid_virt = _intrinsics->at(mid)->is_virtual();
131 if (is_virtual < mid_virt) {
132 hi = mid-1;
133 } else if (is_virtual > mid_virt) {
134 lo = mid+1;
135 } else {
136 return mid; // exact match
137 }
138 }
139 }
140 return lo; // inexact match
141 }
142
143 void Compile::register_intrinsic(CallGenerator* cg) {
144 if (_intrinsics == NULL) {
145 _intrinsics = new (comp_arena())GrowableArray<CallGenerator*>(comp_arena(), 60, 0, NULL);
146 }
147 // This code is stolen from ciObjectFactory::insert.
148 // Really, GrowableArray should have methods for
149 // insert_at, remove_at, and binary_search.
150 int len = _intrinsics->length();
151 int index = intrinsic_insertion_index(cg->method(), cg->is_virtual());
152 if (index == len) {
153 _intrinsics->append(cg);
154 } else {
155 #ifdef ASSERT
156 CallGenerator* oldcg = _intrinsics->at(index);
157 assert(oldcg->method() != cg->method() || oldcg->is_virtual() != cg->is_virtual(), "don't register twice");
158 #endif
159 _intrinsics->append(_intrinsics->at(len-1));
160 int pos;
161 for (pos = len-2; pos >= index; pos--) {
162 _intrinsics->at_put(pos+1,_intrinsics->at(pos));
163 }
164 _intrinsics->at_put(index, cg);
165 }
166 assert(find_intrinsic(cg->method(), cg->is_virtual()) == cg, "registration worked");
167 }
168
169 CallGenerator* Compile::find_intrinsic(ciMethod* m, bool is_virtual) {
170 assert(m->is_loaded(), "don't try this on unloaded methods");
171 if (_intrinsics != NULL) {
172 int index = intrinsic_insertion_index(m, is_virtual);
173 if (index < _intrinsics->length()
174 && _intrinsics->at(index)->method() == m
175 && _intrinsics->at(index)->is_virtual() == is_virtual) {
176 return _intrinsics->at(index);
177 }
178 }
179 // Lazily create intrinsics for intrinsic IDs well-known in the runtime.
180 if (m->intrinsic_id() != vmIntrinsics::_none &&
181 m->intrinsic_id() <= vmIntrinsics::LAST_COMPILER_INLINE) {
182 CallGenerator* cg = make_vm_intrinsic(m, is_virtual);
183 if (cg != NULL) {
184 // Save it for next time:
185 register_intrinsic(cg);
186 return cg;
187 } else {
188 gather_intrinsic_statistics(m->intrinsic_id(), is_virtual, _intrinsic_disabled);
189 }
190 }
191 return NULL;
192 }
193
194 // Compile:: register_library_intrinsics and make_vm_intrinsic are defined
195 // in library_call.cpp.
196
197
198 #ifndef PRODUCT
199 // statistics gathering...
200
201 juint Compile::_intrinsic_hist_count[vmIntrinsics::ID_LIMIT] = {0};
202 jubyte Compile::_intrinsic_hist_flags[vmIntrinsics::ID_LIMIT] = {0};
203
204 bool Compile::gather_intrinsic_statistics(vmIntrinsics::ID id, bool is_virtual, int flags) {
205 assert(id > vmIntrinsics::_none && id < vmIntrinsics::ID_LIMIT, "oob");
206 int oflags = _intrinsic_hist_flags[id];
207 assert(flags != 0, "what happened?");
208 if (is_virtual) {
209 flags |= _intrinsic_virtual;
210 }
211 bool changed = (flags != oflags);
212 if ((flags & _intrinsic_worked) != 0) {
213 juint count = (_intrinsic_hist_count[id] += 1);
214 if (count == 1) {
215 changed = true; // first time
216 }
217 // increment the overall count also:
218 _intrinsic_hist_count[vmIntrinsics::_none] += 1;
219 }
220 if (changed) {
221 if (((oflags ^ flags) & _intrinsic_virtual) != 0) {
222 // Something changed about the intrinsic's virtuality.
223 if ((flags & _intrinsic_virtual) != 0) {
224 // This is the first use of this intrinsic as a virtual call.
225 if (oflags != 0) {
226 // We already saw it as a non-virtual, so note both cases.
227 flags |= _intrinsic_both;
228 }
229 } else if ((oflags & _intrinsic_both) == 0) {
230 // This is the first use of this intrinsic as a non-virtual
231 flags |= _intrinsic_both;
232 }
233 }
234 _intrinsic_hist_flags[id] = (jubyte) (oflags | flags);
235 }
236 // update the overall flags also:
237 _intrinsic_hist_flags[vmIntrinsics::_none] |= (jubyte) flags;
238 return changed;
239 }
240
241 static char* format_flags(int flags, char* buf) {
242 buf[0] = 0;
243 if ((flags & Compile::_intrinsic_worked) != 0) strcat(buf, ",worked");
244 if ((flags & Compile::_intrinsic_failed) != 0) strcat(buf, ",failed");
245 if ((flags & Compile::_intrinsic_disabled) != 0) strcat(buf, ",disabled");
246 if ((flags & Compile::_intrinsic_virtual) != 0) strcat(buf, ",virtual");
247 if ((flags & Compile::_intrinsic_both) != 0) strcat(buf, ",nonvirtual");
248 if (buf[0] == 0) strcat(buf, ",");
249 assert(buf[0] == ',', "must be");
250 return &buf[1];
251 }
252
253 void Compile::print_intrinsic_statistics() {
254 char flagsbuf[100];
255 ttyLocker ttyl;
256 if (xtty != NULL) xtty->head("statistics type='intrinsic'");
257 tty->print_cr("Compiler intrinsic usage:");
258 juint total = _intrinsic_hist_count[vmIntrinsics::_none];
259 if (total == 0) total = 1; // avoid div0 in case of no successes
260 #define PRINT_STAT_LINE(name, c, f) \
261 tty->print_cr(" %4d (%4.1f%%) %s (%s)", (int)(c), ((c) * 100.0) / total, name, f);
262 for (int index = 1 + (int)vmIntrinsics::_none; index < (int)vmIntrinsics::ID_LIMIT; index++) {
263 vmIntrinsics::ID id = (vmIntrinsics::ID) index;
264 int flags = _intrinsic_hist_flags[id];
265 juint count = _intrinsic_hist_count[id];
266 if ((flags | count) != 0) {
267 PRINT_STAT_LINE(vmIntrinsics::name_at(id), count, format_flags(flags, flagsbuf));
268 }
269 }
270 PRINT_STAT_LINE("total", total, format_flags(_intrinsic_hist_flags[vmIntrinsics::_none], flagsbuf));
271 if (xtty != NULL) xtty->tail("statistics");
272 }
273
274 void Compile::print_statistics() {
275 { ttyLocker ttyl;
276 if (xtty != NULL) xtty->head("statistics type='opto'");
277 Parse::print_statistics();
278 PhaseCCP::print_statistics();
279 PhaseRegAlloc::print_statistics();
280 Scheduling::print_statistics();
281 PhasePeephole::print_statistics();
282 PhaseIdealLoop::print_statistics();
283 if (xtty != NULL) xtty->tail("statistics");
284 }
285 if (_intrinsic_hist_flags[vmIntrinsics::_none] != 0) {
286 // put this under its own <statistics> element.
287 print_intrinsic_statistics();
288 }
289 }
290 #endif //PRODUCT
291
292 // Support for bundling info
293 Bundle* Compile::node_bundling(const Node *n) {
294 assert(valid_bundle_info(n), "oob");
295 return &_node_bundling_base[n->_idx];
296 }
297
298 bool Compile::valid_bundle_info(const Node *n) {
299 return (_node_bundling_limit > n->_idx);
300 }
301
302
303 void Compile::gvn_replace_by(Node* n, Node* nn) {
304 for (DUIterator_Last imin, i = n->last_outs(imin); i >= imin; ) {
305 Node* use = n->last_out(i);
306 bool is_in_table = initial_gvn()->hash_delete(use);
307 uint uses_found = 0;
308 for (uint j = 0; j < use->len(); j++) {
309 if (use->in(j) == n) {
310 if (j < use->req())
311 use->set_req(j, nn);
312 else
313 use->set_prec(j, nn);
314 uses_found++;
315 }
316 }
317 if (is_in_table) {
318 // reinsert into table
319 initial_gvn()->hash_find_insert(use);
320 }
321 record_for_igvn(use);
322 i -= uses_found; // we deleted 1 or more copies of this edge
323 }
324 }
325
326
327 static inline bool not_a_node(const Node* n) {
328 if (n == NULL) return true;
329 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc.
330 if (*(address*)n == badAddress) return true; // kill by Node::destruct
331 return false;
332 }
333
334 // Identify all nodes that are reachable from below, useful.
335 // Use breadth-first pass that records state in a Unique_Node_List,
336 // recursive traversal is slower.
337 void Compile::identify_useful_nodes(Unique_Node_List &useful) {
338 int estimated_worklist_size = unique();
339 useful.map( estimated_worklist_size, NULL ); // preallocate space
340
341 // Initialize worklist
342 if (root() != NULL) { useful.push(root()); }
343 // If 'top' is cached, declare it useful to preserve cached node
344 if( cached_top_node() ) { useful.push(cached_top_node()); }
345
346 // Push all useful nodes onto the list, breadthfirst
347 for( uint next = 0; next < useful.size(); ++next ) {
348 assert( next < unique(), "Unique useful nodes < total nodes");
349 Node *n = useful.at(next);
350 uint max = n->len();
351 for( uint i = 0; i < max; ++i ) {
352 Node *m = n->in(i);
353 if (not_a_node(m)) continue;
354 useful.push(m);
355 }
356 }
357 }
358
359 // Update dead_node_list with any missing dead nodes using useful
360 // list. Consider all non-useful nodes to be useless i.e., dead nodes.
361 void Compile::update_dead_node_list(Unique_Node_List &useful) {
362 uint max_idx = unique();
363 VectorSet& useful_node_set = useful.member_set();
364
365 for (uint node_idx = 0; node_idx < max_idx; node_idx++) {
366 // If node with index node_idx is not in useful set,
367 // mark it as dead in dead node list.
368 if (! useful_node_set.test(node_idx) ) {
369 record_dead_node(node_idx);
370 }
371 }
372 }
373
374 void Compile::remove_useless_late_inlines(GrowableArray<CallGenerator*>* inlines, Unique_Node_List &useful) {
375 int shift = 0;
376 for (int i = 0; i < inlines->length(); i++) {
377 CallGenerator* cg = inlines->at(i);
378 CallNode* call = cg->call_node();
379 if (shift > 0) {
380 inlines->at_put(i-shift, cg);
381 }
382 if (!useful.member(call)) {
383 shift++;
384 }
385 }
386 inlines->trunc_to(inlines->length()-shift);
387 }
388
389 // Disconnect all useless nodes by disconnecting those at the boundary.
390 void Compile::remove_useless_nodes(Unique_Node_List &useful) {
391 uint next = 0;
392 while (next < useful.size()) {
393 Node *n = useful.at(next++);
394 // Use raw traversal of out edges since this code removes out edges
395 int max = n->outcnt();
396 for (int j = 0; j < max; ++j) {
397 Node* child = n->raw_out(j);
398 if (! useful.member(child)) {
399 assert(!child->is_top() || child != top(),
400 "If top is cached in Compile object it is in useful list");
401 // Only need to remove this out-edge to the useless node
402 n->raw_del_out(j);
403 --j;
404 --max;
405 }
406 }
407 if (n->outcnt() == 1 && n->has_special_unique_user()) {
408 record_for_igvn(n->unique_out());
409 }
410 }
411 // Remove useless macro and predicate opaq nodes
412 for (int i = C->macro_count()-1; i >= 0; i--) {
413 Node* n = C->macro_node(i);
414 if (!useful.member(n)) {
415 remove_macro_node(n);
416 }
417 }
418 // Remove useless expensive node
419 for (int i = C->expensive_count()-1; i >= 0; i--) {
420 Node* n = C->expensive_node(i);
421 if (!useful.member(n)) {
422 remove_expensive_node(n);
423 }
424 }
425 // clean up the late inline lists
426 remove_useless_late_inlines(&_string_late_inlines, useful);
427 remove_useless_late_inlines(&_boxing_late_inlines, useful);
428 remove_useless_late_inlines(&_late_inlines, useful);
429 debug_only(verify_graph_edges(true/*check for no_dead_code*/);)
430 }
431
432 //------------------------------frame_size_in_words-----------------------------
433 // frame_slots in units of words
434 int Compile::frame_size_in_words() const {
435 // shift is 0 in LP32 and 1 in LP64
436 const int shift = (LogBytesPerWord - LogBytesPerInt);
437 int words = _frame_slots >> shift;
438 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" );
439 return words;
440 }
441
442 // ============================================================================
443 //------------------------------CompileWrapper---------------------------------
444 class CompileWrapper : public StackObj {
445 Compile *const _compile;
446 public:
447 CompileWrapper(Compile* compile);
448
449 ~CompileWrapper();
450 };
451
452 CompileWrapper::CompileWrapper(Compile* compile) : _compile(compile) {
453 // the Compile* pointer is stored in the current ciEnv:
454 ciEnv* env = compile->env();
455 assert(env == ciEnv::current(), "must already be a ciEnv active");
456 assert(env->compiler_data() == NULL, "compile already active?");
457 env->set_compiler_data(compile);
458 assert(compile == Compile::current(), "sanity");
459
460 compile->set_type_dict(NULL);
461 compile->set_type_hwm(NULL);
462 compile->set_type_last_size(0);
463 compile->set_last_tf(NULL, NULL);
464 compile->set_indexSet_arena(NULL);
465 compile->set_indexSet_free_block_list(NULL);
466 compile->init_type_arena();
467 Type::Initialize(compile);
468 _compile->set_scratch_buffer_blob(NULL);
469 _compile->begin_method();
470 }
471 CompileWrapper::~CompileWrapper() {
472 _compile->end_method();
473 if (_compile->scratch_buffer_blob() != NULL)
474 BufferBlob::free(_compile->scratch_buffer_blob());
475 _compile->env()->set_compiler_data(NULL);
476 }
477
478
479 //----------------------------print_compile_messages---------------------------
480 void Compile::print_compile_messages() {
481 #ifndef PRODUCT
482 // Check if recompiling
483 if (_subsume_loads == false && PrintOpto) {
484 // Recompiling without allowing machine instructions to subsume loads
485 tty->print_cr("*********************************************************");
486 tty->print_cr("** Bailout: Recompile without subsuming loads **");
487 tty->print_cr("*********************************************************");
488 }
489 if (_do_escape_analysis != DoEscapeAnalysis && PrintOpto) {
490 // Recompiling without escape analysis
491 tty->print_cr("*********************************************************");
492 tty->print_cr("** Bailout: Recompile without escape analysis **");
493 tty->print_cr("*********************************************************");
494 }
495 if (_eliminate_boxing != EliminateAutoBox && PrintOpto) {
496 // Recompiling without boxing elimination
497 tty->print_cr("*********************************************************");
498 tty->print_cr("** Bailout: Recompile without boxing elimination **");
499 tty->print_cr("*********************************************************");
500 }
501 if (env()->break_at_compile()) {
502 // Open the debugger when compiling this method.
503 tty->print("### Breaking when compiling: ");
504 method()->print_short_name();
505 tty->cr();
506 BREAKPOINT;
507 }
508
509 if( PrintOpto ) {
510 if (is_osr_compilation()) {
511 tty->print("[OSR]%3d", _compile_id);
512 } else {
513 tty->print("%3d", _compile_id);
514 }
515 }
516 #endif
517 }
518
519
520 //-----------------------init_scratch_buffer_blob------------------------------
521 // Construct a temporary BufferBlob and cache it for this compile.
522 void Compile::init_scratch_buffer_blob(int const_size) {
523 // If there is already a scratch buffer blob allocated and the
524 // constant section is big enough, use it. Otherwise free the
525 // current and allocate a new one.
526 BufferBlob* blob = scratch_buffer_blob();
527 if ((blob != NULL) && (const_size <= _scratch_const_size)) {
528 // Use the current blob.
529 } else {
530 if (blob != NULL) {
531 BufferBlob::free(blob);
532 }
533
534 ResourceMark rm;
535 _scratch_const_size = const_size;
536 int size = (MAX_inst_size + MAX_stubs_size + _scratch_const_size);
537 blob = BufferBlob::create("Compile::scratch_buffer", size);
538 // Record the buffer blob for next time.
539 set_scratch_buffer_blob(blob);
540 // Have we run out of code space?
541 if (scratch_buffer_blob() == NULL) {
542 // Let CompilerBroker disable further compilations.
543 record_failure("Not enough space for scratch buffer in CodeCache");
544 return;
545 }
546 }
547
548 // Initialize the relocation buffers
549 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
550 set_scratch_locs_memory(locs_buf);
551 }
552
553
554 //-----------------------scratch_emit_size-------------------------------------
555 // Helper function that computes size by emitting code
556 uint Compile::scratch_emit_size(const Node* n) {
557 // Start scratch_emit_size section.
558 set_in_scratch_emit_size(true);
559
560 // Emit into a trash buffer and count bytes emitted.
561 // This is a pretty expensive way to compute a size,
562 // but it works well enough if seldom used.
563 // All common fixed-size instructions are given a size
564 // method by the AD file.
565 // Note that the scratch buffer blob and locs memory are
566 // allocated at the beginning of the compile task, and
567 // may be shared by several calls to scratch_emit_size.
568 // The allocation of the scratch buffer blob is particularly
569 // expensive, since it has to grab the code cache lock.
570 BufferBlob* blob = this->scratch_buffer_blob();
571 assert(blob != NULL, "Initialize BufferBlob at start");
572 assert(blob->size() > MAX_inst_size, "sanity");
573 relocInfo* locs_buf = scratch_locs_memory();
574 address blob_begin = blob->content_begin();
575 address blob_end = (address)locs_buf;
576 assert(blob->content_contains(blob_end), "sanity");
577 CodeBuffer buf(blob_begin, blob_end - blob_begin);
578 buf.initialize_consts_size(_scratch_const_size);
579 buf.initialize_stubs_size(MAX_stubs_size);
580 assert(locs_buf != NULL, "sanity");
581 int lsize = MAX_locs_size / 3;
582 buf.consts()->initialize_shared_locs(&locs_buf[lsize * 0], lsize);
583 buf.insts()->initialize_shared_locs( &locs_buf[lsize * 1], lsize);
584 buf.stubs()->initialize_shared_locs( &locs_buf[lsize * 2], lsize);
585
586 // Do the emission.
587
588 Label fakeL; // Fake label for branch instructions.
589 Label* saveL = NULL;
590 uint save_bnum = 0;
591 bool is_branch = n->is_MachBranch();
592 if (is_branch) {
593 MacroAssembler masm(&buf);
594 masm.bind(fakeL);
595 n->as_MachBranch()->save_label(&saveL, &save_bnum);
596 n->as_MachBranch()->label_set(&fakeL, 0);
597 }
598 n->emit(buf, this->regalloc());
599 if (is_branch) // Restore label.
600 n->as_MachBranch()->label_set(saveL, save_bnum);
601
602 // End scratch_emit_size section.
603 set_in_scratch_emit_size(false);
604
605 return buf.insts_size();
606 }
607
608
609 // ============================================================================
610 //------------------------------Compile standard-------------------------------
611 debug_only( int Compile::_debug_idx = 100000; )
612
613 // Compile a method. entry_bci is -1 for normal compilations and indicates
614 // the continuation bci for on stack replacement.
615
616
617 Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr_bci,
618 bool subsume_loads, bool do_escape_analysis, bool eliminate_boxing )
619 : Phase(Compiler),
620 _env(ci_env),
621 _log(ci_env->log()),
622 _compile_id(ci_env->compile_id()),
623 _save_argument_registers(false),
624 _stub_name(NULL),
625 _stub_function(NULL),
626 _stub_entry_point(NULL),
627 _method(target),
628 _entry_bci(osr_bci),
629 _initial_gvn(NULL),
630 _for_igvn(NULL),
631 _warm_calls(NULL),
632 _subsume_loads(subsume_loads),
633 _do_escape_analysis(do_escape_analysis),
634 _eliminate_boxing(eliminate_boxing),
635 _failure_reason(NULL),
636 _code_buffer("Compile::Fill_buffer"),
637 _orig_pc_slot(0),
638 _orig_pc_slot_offset_in_bytes(0),
639 _has_method_handle_invokes(false),
640 _mach_constant_base_node(NULL),
641 _node_bundling_limit(0),
642 _node_bundling_base(NULL),
643 _java_calls(0),
644 _inner_loops(0),
645 _scratch_const_size(-1),
646 _in_scratch_emit_size(false),
647 _dead_node_list(comp_arena()),
648 _dead_node_count(0),
649 #ifndef PRODUCT
650 _trace_opto_output(TraceOptoOutput || method()->has_option("TraceOptoOutput")),
651 _in_dump_cnt(0),
652 _printer(IdealGraphPrinter::printer()),
653 #endif
654 _congraph(NULL),
655 _replay_inline_data(NULL),
656 _late_inlines(comp_arena(), 2, 0, NULL),
657 _string_late_inlines(comp_arena(), 2, 0, NULL),
658 _boxing_late_inlines(comp_arena(), 2, 0, NULL),
659 _late_inlines_pos(0),
660 _number_of_mh_late_inlines(0),
661 _inlining_progress(false),
662 _inlining_incrementally(false),
663 _print_inlining_list(NULL),
664 _print_inlining_stream(NULL),
665 _print_inlining_idx(0),
666 _preserve_jvm_state(0) {
667 C = this;
668
669 CompileWrapper cw(this);
670 #ifndef PRODUCT
671 if (TimeCompiler2) {
672 tty->print(" ");
673 target->holder()->name()->print();
674 tty->print(".");
675 target->print_short_name();
676 tty->print(" ");
677 }
678 TraceTime t1("Total compilation time", &_t_totalCompilation, TimeCompiler, TimeCompiler2);
679 TraceTime t2(NULL, &_t_methodCompilation, TimeCompiler, false);
680 bool print_opto_assembly = PrintOptoAssembly || _method->has_option("PrintOptoAssembly");
681 if (!print_opto_assembly) {
682 bool print_assembly = (PrintAssembly || _method->should_print_assembly());
683 if (print_assembly && !Disassembler::can_decode()) {
684 tty->print_cr("PrintAssembly request changed to PrintOptoAssembly");
685 print_opto_assembly = true;
686 }
687 }
688 set_print_assembly(print_opto_assembly);
689 set_parsed_irreducible_loop(false);
690
691 if (method()->has_option("ReplayInline")) {
692 _replay_inline_data = ciReplay::load_inline_data(method(), entry_bci(), ci_env->comp_level());
693 }
694 #endif
695 set_print_inlining(PrintInlining || method()->has_option("PrintInlining") NOT_PRODUCT( || PrintOptoInlining));
696 set_print_intrinsics(PrintIntrinsics || method()->has_option("PrintIntrinsics"));
697
698 if (ProfileTraps) {
699 // Make sure the method being compiled gets its own MDO,
700 // so we can at least track the decompile_count().
701 method()->ensure_method_data();
702 }
703
704 Init(::AliasLevel);
705
706
707 print_compile_messages();
708
709 _ilt = InlineTree::build_inline_tree_root();
710
711 // Even if NO memory addresses are used, MergeMem nodes must have at least 1 slice
712 assert(num_alias_types() >= AliasIdxRaw, "");
713
714 #define MINIMUM_NODE_HASH 1023
715 // Node list that Iterative GVN will start with
716 Unique_Node_List for_igvn(comp_arena());
717 set_for_igvn(&for_igvn);
718
719 // GVN that will be run immediately on new nodes
720 uint estimated_size = method()->code_size()*4+64;
721 estimated_size = (estimated_size < MINIMUM_NODE_HASH ? MINIMUM_NODE_HASH : estimated_size);
722 PhaseGVN gvn(node_arena(), estimated_size);
723 set_initial_gvn(&gvn);
724
725 print_inlining_init();
726 { // Scope for timing the parser
727 TracePhase t3("parse", &_t_parser, true);
728
729 // Put top into the hash table ASAP.
730 initial_gvn()->transform_no_reclaim(top());
731
732 // Set up tf(), start(), and find a CallGenerator.
733 CallGenerator* cg = NULL;
734 if (is_osr_compilation()) {
735 const TypeTuple *domain = StartOSRNode::osr_domain();
736 const TypeTuple *range = TypeTuple::make_range(method()->signature());
737 init_tf(TypeFunc::make(domain, range));
738 StartNode* s = new (this) StartOSRNode(root(), domain);
739 initial_gvn()->set_type_bottom(s);
740 init_start(s);
741 cg = CallGenerator::for_osr(method(), entry_bci());
742 } else {
743 // Normal case.
744 init_tf(TypeFunc::make(method()));
745 StartNode* s = new (this) StartNode(root(), tf()->domain());
746 initial_gvn()->set_type_bottom(s);
747 init_start(s);
748 if (method()->intrinsic_id() == vmIntrinsics::_Reference_get && UseG1GC) {
749 // With java.lang.ref.reference.get() we must go through the
750 // intrinsic when G1 is enabled - even when get() is the root
751 // method of the compile - so that, if necessary, the value in
752 // the referent field of the reference object gets recorded by
753 // the pre-barrier code.
754 // Specifically, if G1 is enabled, the value in the referent
755 // field is recorded by the G1 SATB pre barrier. This will
756 // result in the referent being marked live and the reference
757 // object removed from the list of discovered references during
758 // reference processing.
759 cg = find_intrinsic(method(), false);
760 }
761 if (cg == NULL) {
762 float past_uses = method()->interpreter_invocation_count();
763 float expected_uses = past_uses;
764 cg = CallGenerator::for_inline(method(), expected_uses);
765 }
766 }
767 if (failing()) return;
768 if (cg == NULL) {
769 record_method_not_compilable_all_tiers("cannot parse method");
770 return;
771 }
772 JVMState* jvms = build_start_state(start(), tf());
773 if ((jvms = cg->generate(jvms, NULL)) == NULL) {
774 record_method_not_compilable("method parse failed");
775 return;
776 }
777 GraphKit kit(jvms);
778
779 if (!kit.stopped()) {
780 // Accept return values, and transfer control we know not where.
781 // This is done by a special, unique ReturnNode bound to root.
782 return_values(kit.jvms());
783 }
784
785 if (kit.has_exceptions()) {
786 // Any exceptions that escape from this call must be rethrown
787 // to whatever caller is dynamically above us on the stack.
788 // This is done by a special, unique RethrowNode bound to root.
789 rethrow_exceptions(kit.transfer_exceptions_into_jvms());
790 }
791
792 assert(IncrementalInline || (_late_inlines.length() == 0 && !has_mh_late_inlines()), "incremental inlining is off");
793
794 if (_late_inlines.length() == 0 && !has_mh_late_inlines() && !failing() && has_stringbuilder()) {
795 inline_string_calls(true);
796 }
797
798 if (failing()) return;
799
800 print_method(PHASE_BEFORE_REMOVEUSELESS, 3);
801
802 // Remove clutter produced by parsing.
803 if (!failing()) {
804 ResourceMark rm;
805 PhaseRemoveUseless pru(initial_gvn(), &for_igvn);
806 }
807 }
808
809 // Note: Large methods are capped off in do_one_bytecode().
810 if (failing()) return;
811
812 // After parsing, node notes are no longer automagic.
813 // They must be propagated by register_new_node_with_optimizer(),
814 // clone(), or the like.
815 set_default_node_notes(NULL);
816
817 for (;;) {
818 int successes = Inline_Warm();
819 if (failing()) return;
820 if (successes == 0) break;
821 }
822
823 // Drain the list.
824 Finish_Warm();
825 #ifndef PRODUCT
826 if (_printer) {
827 _printer->print_inlining(this);
828 }
829 #endif
830
831 if (failing()) return;
832 NOT_PRODUCT( verify_graph_edges(); )
833
834 // Now optimize
835 Optimize();
836 if (failing()) return;
837 NOT_PRODUCT( verify_graph_edges(); )
838
839 #ifndef PRODUCT
840 if (PrintIdeal) {
841 ttyLocker ttyl; // keep the following output all in one block
842 // This output goes directly to the tty, not the compiler log.
843 // To enable tools to match it up with the compilation activity,
844 // be sure to tag this tty output with the compile ID.
845 if (xtty != NULL) {
846 xtty->head("ideal compile_id='%d'%s", compile_id(),
847 is_osr_compilation() ? " compile_kind='osr'" :
848 "");
849 }
850 root()->dump(9999);
851 if (xtty != NULL) {
852 xtty->tail("ideal");
853 }
854 }
855 #endif
856
857 NOT_PRODUCT( verify_barriers(); )
858
859 // Dump compilation data to replay it.
860 if (method()->has_option("DumpReplay")) {
861 env()->dump_replay_data(_compile_id);
862 }
863 if (method()->has_option("DumpInline") && (ilt() != NULL)) {
864 env()->dump_inline_data(_compile_id);
865 }
866
867 // Now that we know the size of all the monitors we can add a fixed slot
868 // for the original deopt pc.
869
870 _orig_pc_slot = fixed_slots();
871 int next_slot = _orig_pc_slot + (sizeof(address) / VMRegImpl::stack_slot_size);
872 set_fixed_slots(next_slot);
873
874 // Compute when to use implicit null checks. Used by matching trap based
875 // nodes and NullCheck optimization.
876 set_allowed_deopt_reasons();
877
878 // Now generate code
879 Code_Gen();
880 if (failing()) return;
881
882 // Check if we want to skip execution of all compiled code.
883 {
884 #ifndef PRODUCT
885 if (OptoNoExecute) {
886 record_method_not_compilable("+OptoNoExecute"); // Flag as failed
887 return;
888 }
889 TracePhase t2("install_code", &_t_registerMethod, TimeCompiler);
890 #endif
891
892 if (is_osr_compilation()) {
893 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
894 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
895 } else {
896 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
897 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
898 }
899
900 env()->register_method(_method, _entry_bci,
901 &_code_offsets,
902 _orig_pc_slot_offset_in_bytes,
903 code_buffer(),
904 frame_size_in_words(), _oop_map_set,
905 &_handler_table, &_inc_table,
906 compiler,
907 env()->comp_level(),
908 has_unsafe_access(),
909 SharedRuntime::is_wide_vector(max_vector_size())
910 );
911
912 if (log() != NULL) // Print code cache state into compiler log
913 log()->code_cache_state();
914 }
915 }
916
917 //------------------------------Compile----------------------------------------
918 // Compile a runtime stub
919 Compile::Compile( ciEnv* ci_env,
920 TypeFunc_generator generator,
921 address stub_function,
922 const char *stub_name,
923 int is_fancy_jump,
924 bool pass_tls,
925 bool save_arg_registers,
926 bool return_pc )
927 : Phase(Compiler),
928 _env(ci_env),
929 _log(ci_env->log()),
930 _compile_id(0),
931 _save_argument_registers(save_arg_registers),
932 _method(NULL),
933 _stub_name(stub_name),
934 _stub_function(stub_function),
935 _stub_entry_point(NULL),
936 _entry_bci(InvocationEntryBci),
937 _initial_gvn(NULL),
938 _for_igvn(NULL),
939 _warm_calls(NULL),
940 _orig_pc_slot(0),
941 _orig_pc_slot_offset_in_bytes(0),
942 _subsume_loads(true),
943 _do_escape_analysis(false),
944 _eliminate_boxing(false),
945 _failure_reason(NULL),
946 _code_buffer("Compile::Fill_buffer"),
947 _has_method_handle_invokes(false),
948 _mach_constant_base_node(NULL),
949 _node_bundling_limit(0),
950 _node_bundling_base(NULL),
951 _java_calls(0),
952 _inner_loops(0),
953 #ifndef PRODUCT
954 _trace_opto_output(TraceOptoOutput),
955 _in_dump_cnt(0),
956 _printer(NULL),
957 #endif
958 _dead_node_list(comp_arena()),
959 _dead_node_count(0),
960 _congraph(NULL),
961 _replay_inline_data(NULL),
962 _number_of_mh_late_inlines(0),
963 _inlining_progress(false),
964 _inlining_incrementally(false),
965 _print_inlining_list(NULL),
966 _print_inlining_stream(NULL),
967 _print_inlining_idx(0),
968 _preserve_jvm_state(0),
969 _allowed_reasons(0) {
970 C = this;
971
972 #ifndef PRODUCT
973 TraceTime t1(NULL, &_t_totalCompilation, TimeCompiler, false);
974 TraceTime t2(NULL, &_t_stubCompilation, TimeCompiler, false);
975 set_print_assembly(PrintFrameConverterAssembly);
976 set_parsed_irreducible_loop(false);
977 #endif
978 CompileWrapper cw(this);
979 Init(/*AliasLevel=*/ 0);
980 init_tf((*generator)());
981
982 {
983 // The following is a dummy for the sake of GraphKit::gen_stub
984 Unique_Node_List for_igvn(comp_arena());
985 set_for_igvn(&for_igvn); // not used, but some GraphKit guys push on this
986 PhaseGVN gvn(Thread::current()->resource_area(),255);
987 set_initial_gvn(&gvn); // not significant, but GraphKit guys use it pervasively
988 gvn.transform_no_reclaim(top());
989
990 GraphKit kit;
991 kit.gen_stub(stub_function, stub_name, is_fancy_jump, pass_tls, return_pc);
992 }
993
994 NOT_PRODUCT( verify_graph_edges(); )
995 Code_Gen();
996 if (failing()) return;
997
998
999 // Entry point will be accessed using compile->stub_entry_point();
1000 if (code_buffer() == NULL) {
1001 Matcher::soft_match_failure();
1002 } else {
1003 if (PrintAssembly && (WizardMode || Verbose))
1004 tty->print_cr("### Stub::%s", stub_name);
1005
1006 if (!failing()) {
1007 assert(_fixed_slots == 0, "no fixed slots used for runtime stubs");
1008
1009 // Make the NMethod
1010 // For now we mark the frame as never safe for profile stackwalking
1011 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
1012 code_buffer(),
1013 CodeOffsets::frame_never_safe,
1014 // _code_offsets.value(CodeOffsets::Frame_Complete),
1015 frame_size_in_words(),
1016 _oop_map_set,
1017 save_arg_registers);
1018 assert(rs != NULL && rs->is_runtime_stub(), "sanity check");
1019
1020 _stub_entry_point = rs->entry_point();
1021 }
1022 }
1023 }
1024
1025 //------------------------------Init-------------------------------------------
1026 // Prepare for a single compilation
1027 void Compile::Init(int aliaslevel) {
1028 _unique = 0;
1029 _regalloc = NULL;
1030
1031 _tf = NULL; // filled in later
1032 _top = NULL; // cached later
1033 _matcher = NULL; // filled in later
1034 _cfg = NULL; // filled in later
1035
1036 set_24_bit_selection_and_mode(Use24BitFP, false);
1037
1038 _node_note_array = NULL;
1039 _default_node_notes = NULL;
1040
1041 _immutable_memory = NULL; // filled in at first inquiry
1042
1043 // Globally visible Nodes
1044 // First set TOP to NULL to give safe behavior during creation of RootNode
1045 set_cached_top_node(NULL);
1046 set_root(new (this) RootNode());
1047 // Now that you have a Root to point to, create the real TOP
1048 set_cached_top_node( new (this) ConNode(Type::TOP) );
1049 set_recent_alloc(NULL, NULL);
1050
1051 // Create Debug Information Recorder to record scopes, oopmaps, etc.
1052 env()->set_oop_recorder(new OopRecorder(env()->arena()));
1053 env()->set_debug_info(new DebugInformationRecorder(env()->oop_recorder()));
1054 env()->set_dependencies(new Dependencies(env()));
1055
1056 _fixed_slots = 0;
1057 set_has_split_ifs(false);
1058 set_has_loops(has_method() && method()->has_loops()); // first approximation
1059 set_has_stringbuilder(false);
1060 set_has_boxed_value(false);
1061 _trap_can_recompile = false; // no traps emitted yet
1062 _major_progress = true; // start out assuming good things will happen
1063 set_has_unsafe_access(false);
1064 set_max_vector_size(0);
1065 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist));
1066 set_decompile_count(0);
1067
1068 set_do_freq_based_layout(BlockLayoutByFrequency || method_has_option("BlockLayoutByFrequency"));
1069 set_num_loop_opts(LoopOptsCount);
1070 set_do_inlining(Inline);
1071 set_max_inline_size(MaxInlineSize);
1072 set_freq_inline_size(FreqInlineSize);
1073 set_do_scheduling(OptoScheduling);
1074 set_do_count_invocations(false);
1075 set_do_method_data_update(false);
1076
1077 if (debug_info()->recording_non_safepoints()) {
1078 set_node_note_array(new(comp_arena()) GrowableArray<Node_Notes*>
1079 (comp_arena(), 8, 0, NULL));
1080 set_default_node_notes(Node_Notes::make(this));
1081 }
1082
1083 // // -- Initialize types before each compile --
1084 // // Update cached type information
1085 // if( _method && _method->constants() )
1086 // Type::update_loaded_types(_method, _method->constants());
1087
1088 // Init alias_type map.
1089 if (!_do_escape_analysis && aliaslevel == 3)
1090 aliaslevel = 2; // No unique types without escape analysis
1091 _AliasLevel = aliaslevel;
1092 const int grow_ats = 16;
1093 _max_alias_types = grow_ats;
1094 _alias_types = NEW_ARENA_ARRAY(comp_arena(), AliasType*, grow_ats);
1095 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, grow_ats);
1096 Copy::zero_to_bytes(ats, sizeof(AliasType)*grow_ats);
1097 {
1098 for (int i = 0; i < grow_ats; i++) _alias_types[i] = &ats[i];
1099 }
1100 // Initialize the first few types.
1101 _alias_types[AliasIdxTop]->Init(AliasIdxTop, NULL);
1102 _alias_types[AliasIdxBot]->Init(AliasIdxBot, TypePtr::BOTTOM);
1103 _alias_types[AliasIdxRaw]->Init(AliasIdxRaw, TypeRawPtr::BOTTOM);
1104 _num_alias_types = AliasIdxRaw+1;
1105 // Zero out the alias type cache.
1106 Copy::zero_to_bytes(_alias_cache, sizeof(_alias_cache));
1107 // A NULL adr_type hits in the cache right away. Preload the right answer.
1108 probe_alias_cache(NULL)->_index = AliasIdxTop;
1109
1110 _intrinsics = NULL;
1111 _macro_nodes = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1112 _predicate_opaqs = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1113 _expensive_nodes = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL);
1114 register_library_intrinsics();
1115 }
1116
1117 //---------------------------init_start----------------------------------------
1118 // Install the StartNode on this compile object.
1119 void Compile::init_start(StartNode* s) {
1120 if (failing())
1121 return; // already failing
1122 assert(s == start(), "");
1123 }
1124
1125 StartNode* Compile::start() const {
1126 assert(!failing(), "");
1127 for (DUIterator_Fast imax, i = root()->fast_outs(imax); i < imax; i++) {
1128 Node* start = root()->fast_out(i);
1129 if( start->is_Start() )
1130 return start->as_Start();
1131 }
1132 ShouldNotReachHere();
1133 return NULL;
1134 }
1135
1136 //-------------------------------immutable_memory-------------------------------------
1137 // Access immutable memory
1138 Node* Compile::immutable_memory() {
1139 if (_immutable_memory != NULL) {
1140 return _immutable_memory;
1141 }
1142 StartNode* s = start();
1143 for (DUIterator_Fast imax, i = s->fast_outs(imax); true; i++) {
1144 Node *p = s->fast_out(i);
1145 if (p != s && p->as_Proj()->_con == TypeFunc::Memory) {
1146 _immutable_memory = p;
1147 return _immutable_memory;
1148 }
1149 }
1150 ShouldNotReachHere();
1151 return NULL;
1152 }
1153
1154 //----------------------set_cached_top_node------------------------------------
1155 // Install the cached top node, and make sure Node::is_top works correctly.
1156 void Compile::set_cached_top_node(Node* tn) {
1157 if (tn != NULL) verify_top(tn);
1158 Node* old_top = _top;
1159 _top = tn;
1160 // Calling Node::setup_is_top allows the nodes the chance to adjust
1161 // their _out arrays.
1162 if (_top != NULL) _top->setup_is_top();
1163 if (old_top != NULL) old_top->setup_is_top();
1164 assert(_top == NULL || top()->is_top(), "");
1165 }
1166
1167 #ifdef ASSERT
1168 uint Compile::count_live_nodes_by_graph_walk() {
1169 Unique_Node_List useful(comp_arena());
1170 // Get useful node list by walking the graph.
1171 identify_useful_nodes(useful);
1172 return useful.size();
1173 }
1174
1175 void Compile::print_missing_nodes() {
1176
1177 // Return if CompileLog is NULL and PrintIdealNodeCount is false.
1178 if ((_log == NULL) && (! PrintIdealNodeCount)) {
1179 return;
1180 }
1181
1182 // This is an expensive function. It is executed only when the user
1183 // specifies VerifyIdealNodeCount option or otherwise knows the
1184 // additional work that needs to be done to identify reachable nodes
1185 // by walking the flow graph and find the missing ones using
1186 // _dead_node_list.
1187
1188 Unique_Node_List useful(comp_arena());
1189 // Get useful node list by walking the graph.
1190 identify_useful_nodes(useful);
1191
1192 uint l_nodes = C->live_nodes();
1193 uint l_nodes_by_walk = useful.size();
1194
1195 if (l_nodes != l_nodes_by_walk) {
1196 if (_log != NULL) {
1197 _log->begin_head("mismatched_nodes count='%d'", abs((int) (l_nodes - l_nodes_by_walk)));
1198 _log->stamp();
1199 _log->end_head();
1200 }
1201 VectorSet& useful_member_set = useful.member_set();
1202 int last_idx = l_nodes_by_walk;
1203 for (int i = 0; i < last_idx; i++) {
1204 if (useful_member_set.test(i)) {
1205 if (_dead_node_list.test(i)) {
1206 if (_log != NULL) {
1207 _log->elem("mismatched_node_info node_idx='%d' type='both live and dead'", i);
1208 }
1209 if (PrintIdealNodeCount) {
1210 // Print the log message to tty
1211 tty->print_cr("mismatched_node idx='%d' both live and dead'", i);
1212 useful.at(i)->dump();
1213 }
1214 }
1215 }
1216 else if (! _dead_node_list.test(i)) {
1217 if (_log != NULL) {
1218 _log->elem("mismatched_node_info node_idx='%d' type='neither live nor dead'", i);
1219 }
1220 if (PrintIdealNodeCount) {
1221 // Print the log message to tty
1222 tty->print_cr("mismatched_node idx='%d' type='neither live nor dead'", i);
1223 }
1224 }
1225 }
1226 if (_log != NULL) {
1227 _log->tail("mismatched_nodes");
1228 }
1229 }
1230 }
1231 #endif
1232
1233 #ifndef PRODUCT
1234 void Compile::verify_top(Node* tn) const {
1235 if (tn != NULL) {
1236 assert(tn->is_Con(), "top node must be a constant");
1237 assert(((ConNode*)tn)->type() == Type::TOP, "top node must have correct type");
1238 assert(tn->in(0) != NULL, "must have live top node");
1239 }
1240 }
1241 #endif
1242
1243
1244 ///-------------------Managing Per-Node Debug & Profile Info-------------------
1245
1246 void Compile::grow_node_notes(GrowableArray<Node_Notes*>* arr, int grow_by) {
1247 guarantee(arr != NULL, "");
1248 int num_blocks = arr->length();
1249 if (grow_by < num_blocks) grow_by = num_blocks;
1250 int num_notes = grow_by * _node_notes_block_size;
1251 Node_Notes* notes = NEW_ARENA_ARRAY(node_arena(), Node_Notes, num_notes);
1252 Copy::zero_to_bytes(notes, num_notes * sizeof(Node_Notes));
1253 while (num_notes > 0) {
1254 arr->append(notes);
1255 notes += _node_notes_block_size;
1256 num_notes -= _node_notes_block_size;
1257 }
1258 assert(num_notes == 0, "exact multiple, please");
1259 }
1260
1261 bool Compile::copy_node_notes_to(Node* dest, Node* source) {
1262 if (source == NULL || dest == NULL) return false;
1263
1264 if (dest->is_Con())
1265 return false; // Do not push debug info onto constants.
1266
1267 #ifdef ASSERT
1268 // Leave a bread crumb trail pointing to the original node:
1269 if (dest != NULL && dest != source && dest->debug_orig() == NULL) {
1270 dest->set_debug_orig(source);
1271 }
1272 #endif
1273
1274 if (node_note_array() == NULL)
1275 return false; // Not collecting any notes now.
1276
1277 // This is a copy onto a pre-existing node, which may already have notes.
1278 // If both nodes have notes, do not overwrite any pre-existing notes.
1279 Node_Notes* source_notes = node_notes_at(source->_idx);
1280 if (source_notes == NULL || source_notes->is_clear()) return false;
1281 Node_Notes* dest_notes = node_notes_at(dest->_idx);
1282 if (dest_notes == NULL || dest_notes->is_clear()) {
1283 return set_node_notes_at(dest->_idx, source_notes);
1284 }
1285
1286 Node_Notes merged_notes = (*source_notes);
1287 // The order of operations here ensures that dest notes will win...
1288 merged_notes.update_from(dest_notes);
1289 return set_node_notes_at(dest->_idx, &merged_notes);
1290 }
1291
1292
1293 //--------------------------allow_range_check_smearing-------------------------
1294 // Gating condition for coalescing similar range checks.
1295 // Sometimes we try 'speculatively' replacing a series of a range checks by a
1296 // single covering check that is at least as strong as any of them.
1297 // If the optimization succeeds, the simplified (strengthened) range check
1298 // will always succeed. If it fails, we will deopt, and then give up
1299 // on the optimization.
1300 bool Compile::allow_range_check_smearing() const {
1301 // If this method has already thrown a range-check,
1302 // assume it was because we already tried range smearing
1303 // and it failed.
1304 uint already_trapped = trap_count(Deoptimization::Reason_range_check);
1305 return !already_trapped;
1306 }
1307
1308
1309 //------------------------------flatten_alias_type-----------------------------
1310 const TypePtr *Compile::flatten_alias_type( const TypePtr *tj ) const {
1311 int offset = tj->offset();
1312 TypePtr::PTR ptr = tj->ptr();
1313
1314 // Known instance (scalarizable allocation) alias only with itself.
1315 bool is_known_inst = tj->isa_oopptr() != NULL &&
1316 tj->is_oopptr()->is_known_instance();
1317
1318 // Process weird unsafe references.
1319 if (offset == Type::OffsetBot && (tj->isa_instptr() /*|| tj->isa_klassptr()*/)) {
1320 assert(InlineUnsafeOps, "indeterminate pointers come only from unsafe ops");
1321 assert(!is_known_inst, "scalarizable allocation should not have unsafe references");
1322 tj = TypeOopPtr::BOTTOM;
1323 ptr = tj->ptr();
1324 offset = tj->offset();
1325 }
1326
1327 // Array pointers need some flattening
1328 const TypeAryPtr *ta = tj->isa_aryptr();
1329 if (ta && ta->is_stable()) {
1330 // Erase stability property for alias analysis.
1331 tj = ta = ta->cast_to_stable(false);
1332 }
1333 if( ta && is_known_inst ) {
1334 if ( offset != Type::OffsetBot &&
1335 offset > arrayOopDesc::length_offset_in_bytes() ) {
1336 offset = Type::OffsetBot; // Flatten constant access into array body only
1337 tj = ta = TypeAryPtr::make(ptr, ta->ary(), ta->klass(), true, offset, ta->instance_id());
1338 }
1339 } else if( ta && _AliasLevel >= 2 ) {
1340 // For arrays indexed by constant indices, we flatten the alias
1341 // space to include all of the array body. Only the header, klass
1342 // and array length can be accessed un-aliased.
1343 if( offset != Type::OffsetBot ) {
1344 if( ta->const_oop() ) { // MethodData* or Method*
1345 offset = Type::OffsetBot; // Flatten constant access into array body
1346 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),ta->ary(),ta->klass(),false,offset);
1347 } else if( offset == arrayOopDesc::length_offset_in_bytes() ) {
1348 // range is OK as-is.
1349 tj = ta = TypeAryPtr::RANGE;
1350 } else if( offset == oopDesc::klass_offset_in_bytes() ) {
1351 tj = TypeInstPtr::KLASS; // all klass loads look alike
1352 ta = TypeAryPtr::RANGE; // generic ignored junk
1353 ptr = TypePtr::BotPTR;
1354 } else if( offset == oopDesc::mark_offset_in_bytes() ) {
1355 tj = TypeInstPtr::MARK;
1356 ta = TypeAryPtr::RANGE; // generic ignored junk
1357 ptr = TypePtr::BotPTR;
1358 } else { // Random constant offset into array body
1359 offset = Type::OffsetBot; // Flatten constant access into array body
1360 tj = ta = TypeAryPtr::make(ptr,ta->ary(),ta->klass(),false,offset);
1361 }
1362 }
1363 // Arrays of fixed size alias with arrays of unknown size.
1364 if (ta->size() != TypeInt::POS) {
1365 const TypeAry *tary = TypeAry::make(ta->elem(), TypeInt::POS);
1366 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,ta->klass(),false,offset);
1367 }
1368 // Arrays of known objects become arrays of unknown objects.
1369 if (ta->elem()->isa_narrowoop() && ta->elem() != TypeNarrowOop::BOTTOM) {
1370 const TypeAry *tary = TypeAry::make(TypeNarrowOop::BOTTOM, ta->size());
1371 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,offset);
1372 }
1373 if (ta->elem()->isa_oopptr() && ta->elem() != TypeInstPtr::BOTTOM) {
1374 const TypeAry *tary = TypeAry::make(TypeInstPtr::BOTTOM, ta->size());
1375 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,offset);
1376 }
1377 // Arrays of bytes and of booleans both use 'bastore' and 'baload' so
1378 // cannot be distinguished by bytecode alone.
1379 if (ta->elem() == TypeInt::BOOL) {
1380 const TypeAry *tary = TypeAry::make(TypeInt::BYTE, ta->size());
1381 ciKlass* aklass = ciTypeArrayKlass::make(T_BYTE);
1382 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,aklass,false,offset);
1383 }
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 if (ptr == TypePtr::NotNull || ta->klass_is_exact() || ta->speculative() != NULL) {
1388 tj = ta = TypeAryPtr::make(TypePtr::BotPTR,ta->ary(),ta->klass(),false,offset);
1389 }
1390 }
1391
1392 // Oop pointers need some flattening
1393 const TypeInstPtr *to = tj->isa_instptr();
1394 if( to && _AliasLevel >= 2 && to != TypeOopPtr::BOTTOM ) {
1395 ciInstanceKlass *k = to->klass()->as_instance_klass();
1396 if( ptr == TypePtr::Constant ) {
1397 if (to->klass() != ciEnv::current()->Class_klass() ||
1398 offset < k->size_helper() * wordSize) {
1399 // No constant oop pointers (such as Strings); they alias with
1400 // unknown strings.
1401 assert(!is_known_inst, "not scalarizable allocation");
1402 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset);
1403 }
1404 } else if( is_known_inst ) {
1405 tj = to; // Keep NotNull and klass_is_exact for instance type
1406 } else if( ptr == TypePtr::NotNull || to->klass_is_exact() ) {
1407 // During the 2nd round of IterGVN, NotNull castings are removed.
1408 // Make sure the Bottom and NotNull variants alias the same.
1409 // Also, make sure exact and non-exact variants alias the same.
1410 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset);
1411 }
1412 if (to->speculative() != NULL) {
1413 tj = to = TypeInstPtr::make(to->ptr(),to->klass(),to->klass_is_exact(),to->const_oop(),to->offset(), to->instance_id());
1414 }
1415 // Canonicalize the holder of this field
1416 if (offset >= 0 && offset < instanceOopDesc::base_offset_in_bytes()) {
1417 // First handle header references such as a LoadKlassNode, even if the
1418 // object's klass is unloaded at compile time (4965979).
1419 if (!is_known_inst) { // Do it only for non-instance types
1420 tj = to = TypeInstPtr::make(TypePtr::BotPTR, env()->Object_klass(), false, NULL, offset);
1421 }
1422 } else if (offset < 0 || offset >= k->size_helper() * wordSize) {
1423 // Static fields are in the space above the normal instance
1424 // fields in the java.lang.Class instance.
1425 if (to->klass() != ciEnv::current()->Class_klass()) {
1426 to = NULL;
1427 tj = TypeOopPtr::BOTTOM;
1428 offset = tj->offset();
1429 }
1430 } else {
1431 ciInstanceKlass *canonical_holder = k->get_canonical_holder(offset);
1432 if (!k->equals(canonical_holder) || tj->offset() != offset) {
1433 if( is_known_inst ) {
1434 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, true, NULL, offset, to->instance_id());
1435 } else {
1436 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, false, NULL, offset);
1437 }
1438 }
1439 }
1440 }
1441
1442 // Klass pointers to object array klasses need some flattening
1443 const TypeKlassPtr *tk = tj->isa_klassptr();
1444 if( tk ) {
1445 // If we are referencing a field within a Klass, we need
1446 // to assume the worst case of an Object. Both exact and
1447 // inexact types must flatten to the same alias class so
1448 // use NotNull as the PTR.
1449 if ( offset == Type::OffsetBot || (offset >= 0 && (size_t)offset < sizeof(Klass)) ) {
1450
1451 tj = tk = TypeKlassPtr::make(TypePtr::NotNull,
1452 TypeKlassPtr::OBJECT->klass(),
1453 offset);
1454 }
1455
1456 ciKlass* klass = tk->klass();
1457 if( klass->is_obj_array_klass() ) {
1458 ciKlass* k = TypeAryPtr::OOPS->klass();
1459 if( !k || !k->is_loaded() ) // Only fails for some -Xcomp runs
1460 k = TypeInstPtr::BOTTOM->klass();
1461 tj = tk = TypeKlassPtr::make( TypePtr::NotNull, k, offset );
1462 }
1463
1464 // Check for precise loads from the primary supertype array and force them
1465 // to the supertype cache alias index. Check for generic array loads from
1466 // the primary supertype array and also force them to the supertype cache
1467 // alias index. Since the same load can reach both, we need to merge
1468 // these 2 disparate memories into the same alias class. Since the
1469 // primary supertype array is read-only, there's no chance of confusion
1470 // where we bypass an array load and an array store.
1471 int primary_supers_offset = in_bytes(Klass::primary_supers_offset());
1472 if (offset == Type::OffsetBot ||
1473 (offset >= primary_supers_offset &&
1474 offset < (int)(primary_supers_offset + Klass::primary_super_limit() * wordSize)) ||
1475 offset == (int)in_bytes(Klass::secondary_super_cache_offset())) {
1476 offset = in_bytes(Klass::secondary_super_cache_offset());
1477 tj = tk = TypeKlassPtr::make( TypePtr::NotNull, tk->klass(), offset );
1478 }
1479 }
1480
1481 // Flatten all Raw pointers together.
1482 if (tj->base() == Type::RawPtr)
1483 tj = TypeRawPtr::BOTTOM;
1484
1485 if (tj->base() == Type::AnyPtr)
1486 tj = TypePtr::BOTTOM; // An error, which the caller must check for.
1487
1488 // Flatten all to bottom for now
1489 switch( _AliasLevel ) {
1490 case 0:
1491 tj = TypePtr::BOTTOM;
1492 break;
1493 case 1: // Flatten to: oop, static, field or array
1494 switch (tj->base()) {
1495 //case Type::AryPtr: tj = TypeAryPtr::RANGE; break;
1496 case Type::RawPtr: tj = TypeRawPtr::BOTTOM; break;
1497 case Type::AryPtr: // do not distinguish arrays at all
1498 case Type::InstPtr: tj = TypeInstPtr::BOTTOM; break;
1499 case Type::KlassPtr: tj = TypeKlassPtr::OBJECT; break;
1500 case Type::AnyPtr: tj = TypePtr::BOTTOM; break; // caller checks it
1501 default: ShouldNotReachHere();
1502 }
1503 break;
1504 case 2: // No collapsing at level 2; keep all splits
1505 case 3: // No collapsing at level 3; keep all splits
1506 break;
1507 default:
1508 Unimplemented();
1509 }
1510
1511 offset = tj->offset();
1512 assert( offset != Type::OffsetTop, "Offset has fallen from constant" );
1513
1514 assert( (offset != Type::OffsetBot && tj->base() != Type::AryPtr) ||
1515 (offset == Type::OffsetBot && tj->base() == Type::AryPtr) ||
1516 (offset == Type::OffsetBot && tj == TypeOopPtr::BOTTOM) ||
1517 (offset == Type::OffsetBot && tj == TypePtr::BOTTOM) ||
1518 (offset == oopDesc::mark_offset_in_bytes() && tj->base() == Type::AryPtr) ||
1519 (offset == oopDesc::klass_offset_in_bytes() && tj->base() == Type::AryPtr) ||
1520 (offset == arrayOopDesc::length_offset_in_bytes() && tj->base() == Type::AryPtr) ,
1521 "For oops, klasses, raw offset must be constant; for arrays the offset is never known" );
1522 assert( tj->ptr() != TypePtr::TopPTR &&
1523 tj->ptr() != TypePtr::AnyNull &&
1524 tj->ptr() != TypePtr::Null, "No imprecise addresses" );
1525 // assert( tj->ptr() != TypePtr::Constant ||
1526 // tj->base() == Type::RawPtr ||
1527 // tj->base() == Type::KlassPtr, "No constant oop addresses" );
1528
1529 return tj;
1530 }
1531
1532 void Compile::AliasType::Init(int i, const TypePtr* at) {
1533 _index = i;
1534 _adr_type = at;
1535 _field = NULL;
1536 _element = NULL;
1537 _is_rewritable = true; // default
1538 const TypeOopPtr *atoop = (at != NULL) ? at->isa_oopptr() : NULL;
1539 if (atoop != NULL && atoop->is_known_instance()) {
1540 const TypeOopPtr *gt = atoop->cast_to_instance_id(TypeOopPtr::InstanceBot);
1541 _general_index = Compile::current()->get_alias_index(gt);
1542 } else {
1543 _general_index = 0;
1544 }
1545 }
1546
1547 //---------------------------------print_on------------------------------------
1548 #ifndef PRODUCT
1549 void Compile::AliasType::print_on(outputStream* st) {
1550 if (index() < 10)
1551 st->print("@ <%d> ", index());
1552 else st->print("@ <%d>", index());
1553 st->print(is_rewritable() ? " " : " RO");
1554 int offset = adr_type()->offset();
1555 if (offset == Type::OffsetBot)
1556 st->print(" +any");
1557 else st->print(" +%-3d", offset);
1558 st->print(" in ");
1559 adr_type()->dump_on(st);
1560 const TypeOopPtr* tjp = adr_type()->isa_oopptr();
1561 if (field() != NULL && tjp) {
1562 if (tjp->klass() != field()->holder() ||
1563 tjp->offset() != field()->offset_in_bytes()) {
1564 st->print(" != ");
1565 field()->print();
1566 st->print(" ***");
1567 }
1568 }
1569 }
1570
1571 void print_alias_types() {
1572 Compile* C = Compile::current();
1573 tty->print_cr("--- Alias types, AliasIdxBot .. %d", C->num_alias_types()-1);
1574 for (int idx = Compile::AliasIdxBot; idx < C->num_alias_types(); idx++) {
1575 C->alias_type(idx)->print_on(tty);
1576 tty->cr();
1577 }
1578 }
1579 #endif
1580
1581
1582 //----------------------------probe_alias_cache--------------------------------
1583 Compile::AliasCacheEntry* Compile::probe_alias_cache(const TypePtr* adr_type) {
1584 intptr_t key = (intptr_t) adr_type;
1585 key ^= key >> logAliasCacheSize;
1586 return &_alias_cache[key & right_n_bits(logAliasCacheSize)];
1587 }
1588
1589
1590 //-----------------------------grow_alias_types--------------------------------
1591 void Compile::grow_alias_types() {
1592 const int old_ats = _max_alias_types; // how many before?
1593 const int new_ats = old_ats; // how many more?
1594 const int grow_ats = old_ats+new_ats; // how many now?
1595 _max_alias_types = grow_ats;
1596 _alias_types = REALLOC_ARENA_ARRAY(comp_arena(), AliasType*, _alias_types, old_ats, grow_ats);
1597 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, new_ats);
1598 Copy::zero_to_bytes(ats, sizeof(AliasType)*new_ats);
1599 for (int i = 0; i < new_ats; i++) _alias_types[old_ats+i] = &ats[i];
1600 }
1601
1602
1603 //--------------------------------find_alias_type------------------------------
1604 Compile::AliasType* Compile::find_alias_type(const TypePtr* adr_type, bool no_create, ciField* original_field) {
1605 if (_AliasLevel == 0)
1606 return alias_type(AliasIdxBot);
1607
1608 AliasCacheEntry* ace = probe_alias_cache(adr_type);
1609 if (ace->_adr_type == adr_type) {
1610 return alias_type(ace->_index);
1611 }
1612
1613 // Handle special cases.
1614 if (adr_type == NULL) return alias_type(AliasIdxTop);
1615 if (adr_type == TypePtr::BOTTOM) return alias_type(AliasIdxBot);
1616
1617 // Do it the slow way.
1618 const TypePtr* flat = flatten_alias_type(adr_type);
1619
1620 #ifdef ASSERT
1621 assert(flat == flatten_alias_type(flat), "idempotent");
1622 assert(flat != TypePtr::BOTTOM, "cannot alias-analyze an untyped ptr");
1623 if (flat->isa_oopptr() && !flat->isa_klassptr()) {
1624 const TypeOopPtr* foop = flat->is_oopptr();
1625 // Scalarizable allocations have exact klass always.
1626 bool exact = !foop->klass_is_exact() || foop->is_known_instance();
1627 const TypePtr* xoop = foop->cast_to_exactness(exact)->is_ptr();
1628 assert(foop == flatten_alias_type(xoop), "exactness must not affect alias type");
1629 }
1630 assert(flat == flatten_alias_type(flat), "exact bit doesn't matter");
1631 #endif
1632
1633 int idx = AliasIdxTop;
1634 for (int i = 0; i < num_alias_types(); i++) {
1635 if (alias_type(i)->adr_type() == flat) {
1636 idx = i;
1637 break;
1638 }
1639 }
1640
1641 if (idx == AliasIdxTop) {
1642 if (no_create) return NULL;
1643 // Grow the array if necessary.
1644 if (_num_alias_types == _max_alias_types) grow_alias_types();
1645 // Add a new alias type.
1646 idx = _num_alias_types++;
1647 _alias_types[idx]->Init(idx, flat);
1648 if (flat == TypeInstPtr::KLASS) alias_type(idx)->set_rewritable(false);
1649 if (flat == TypeAryPtr::RANGE) alias_type(idx)->set_rewritable(false);
1650 if (flat->isa_instptr()) {
1651 if (flat->offset() == java_lang_Class::klass_offset_in_bytes()
1652 && flat->is_instptr()->klass() == env()->Class_klass())
1653 alias_type(idx)->set_rewritable(false);
1654 }
1655 if (flat->isa_aryptr()) {
1656 #ifdef ASSERT
1657 const int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1658 // (T_BYTE has the weakest alignment and size restrictions...)
1659 assert(flat->offset() < header_size_min, "array body reference must be OffsetBot");
1660 #endif
1661 if (flat->offset() == TypePtr::OffsetBot) {
1662 alias_type(idx)->set_element(flat->is_aryptr()->elem());
1663 }
1664 }
1665 if (flat->isa_klassptr()) {
1666 if (flat->offset() == in_bytes(Klass::super_check_offset_offset()))
1667 alias_type(idx)->set_rewritable(false);
1668 if (flat->offset() == in_bytes(Klass::modifier_flags_offset()))
1669 alias_type(idx)->set_rewritable(false);
1670 if (flat->offset() == in_bytes(Klass::access_flags_offset()))
1671 alias_type(idx)->set_rewritable(false);
1672 if (flat->offset() == in_bytes(Klass::java_mirror_offset()))
1673 alias_type(idx)->set_rewritable(false);
1674 }
1675 // %%% (We would like to finalize JavaThread::threadObj_offset(),
1676 // but the base pointer type is not distinctive enough to identify
1677 // references into JavaThread.)
1678
1679 // Check for final fields.
1680 const TypeInstPtr* tinst = flat->isa_instptr();
1681 if (tinst && tinst->offset() >= instanceOopDesc::base_offset_in_bytes()) {
1682 ciField* field;
1683 if (tinst->const_oop() != NULL &&
1684 tinst->klass() == ciEnv::current()->Class_klass() &&
1685 tinst->offset() >= (tinst->klass()->as_instance_klass()->size_helper() * wordSize)) {
1686 // static field
1687 ciInstanceKlass* k = tinst->const_oop()->as_instance()->java_lang_Class_klass()->as_instance_klass();
1688 field = k->get_field_by_offset(tinst->offset(), true);
1689 } else {
1690 ciInstanceKlass *k = tinst->klass()->as_instance_klass();
1691 field = k->get_field_by_offset(tinst->offset(), false);
1692 }
1693 assert(field == NULL ||
1694 original_field == NULL ||
1695 (field->holder() == original_field->holder() &&
1696 field->offset() == original_field->offset() &&
1697 field->is_static() == original_field->is_static()), "wrong field?");
1698 // Set field() and is_rewritable() attributes.
1699 if (field != NULL) alias_type(idx)->set_field(field);
1700 }
1701 }
1702
1703 // Fill the cache for next time.
1704 ace->_adr_type = adr_type;
1705 ace->_index = idx;
1706 assert(alias_type(adr_type) == alias_type(idx), "type must be installed");
1707
1708 // Might as well try to fill the cache for the flattened version, too.
1709 AliasCacheEntry* face = probe_alias_cache(flat);
1710 if (face->_adr_type == NULL) {
1711 face->_adr_type = flat;
1712 face->_index = idx;
1713 assert(alias_type(flat) == alias_type(idx), "flat type must work too");
1714 }
1715
1716 return alias_type(idx);
1717 }
1718
1719
1720 Compile::AliasType* Compile::alias_type(ciField* field) {
1721 const TypeOopPtr* t;
1722 if (field->is_static())
1723 t = TypeInstPtr::make(field->holder()->java_mirror());
1724 else
1725 t = TypeOopPtr::make_from_klass_raw(field->holder());
1726 AliasType* atp = alias_type(t->add_offset(field->offset_in_bytes()), field);
1727 assert((field->is_final() || field->is_stable()) == !atp->is_rewritable(), "must get the rewritable bits correct");
1728 return atp;
1729 }
1730
1731
1732 //------------------------------have_alias_type--------------------------------
1733 bool Compile::have_alias_type(const TypePtr* adr_type) {
1734 AliasCacheEntry* ace = probe_alias_cache(adr_type);
1735 if (ace->_adr_type == adr_type) {
1736 return true;
1737 }
1738
1739 // Handle special cases.
1740 if (adr_type == NULL) return true;
1741 if (adr_type == TypePtr::BOTTOM) return true;
1742
1743 return find_alias_type(adr_type, true, NULL) != NULL;
1744 }
1745
1746 //-----------------------------must_alias--------------------------------------
1747 // True if all values of the given address type are in the given alias category.
1748 bool Compile::must_alias(const TypePtr* adr_type, int alias_idx) {
1749 if (alias_idx == AliasIdxBot) return true; // the universal category
1750 if (adr_type == NULL) return true; // NULL serves as TypePtr::TOP
1751 if (alias_idx == AliasIdxTop) return false; // the empty category
1752 if (adr_type->base() == Type::AnyPtr) return false; // TypePtr::BOTTOM or its twins
1753
1754 // the only remaining possible overlap is identity
1755 int adr_idx = get_alias_index(adr_type);
1756 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, "");
1757 assert(adr_idx == alias_idx ||
1758 (alias_type(alias_idx)->adr_type() != TypeOopPtr::BOTTOM
1759 && adr_type != TypeOopPtr::BOTTOM),
1760 "should not be testing for overlap with an unsafe pointer");
1761 return adr_idx == alias_idx;
1762 }
1763
1764 //------------------------------can_alias--------------------------------------
1765 // True if any values of the given address type are in the given alias category.
1766 bool Compile::can_alias(const TypePtr* adr_type, int alias_idx) {
1767 if (alias_idx == AliasIdxTop) return false; // the empty category
1768 if (adr_type == NULL) return false; // NULL serves as TypePtr::TOP
1769 if (alias_idx == AliasIdxBot) return true; // the universal category
1770 if (adr_type->base() == Type::AnyPtr) return true; // TypePtr::BOTTOM or its twins
1771
1772 // the only remaining possible overlap is identity
1773 int adr_idx = get_alias_index(adr_type);
1774 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, "");
1775 return adr_idx == alias_idx;
1776 }
1777
1778
1779
1780 //---------------------------pop_warm_call-------------------------------------
1781 WarmCallInfo* Compile::pop_warm_call() {
1782 WarmCallInfo* wci = _warm_calls;
1783 if (wci != NULL) _warm_calls = wci->remove_from(wci);
1784 return wci;
1785 }
1786
1787 //----------------------------Inline_Warm--------------------------------------
1788 int Compile::Inline_Warm() {
1789 // If there is room, try to inline some more warm call sites.
1790 // %%% Do a graph index compaction pass when we think we're out of space?
1791 if (!InlineWarmCalls) return 0;
1792
1793 int calls_made_hot = 0;
1794 int room_to_grow = NodeCountInliningCutoff - unique();
1795 int amount_to_grow = MIN2(room_to_grow, (int)NodeCountInliningStep);
1796 int amount_grown = 0;
1797 WarmCallInfo* call;
1798 while (amount_to_grow > 0 && (call = pop_warm_call()) != NULL) {
1799 int est_size = (int)call->size();
1800 if (est_size > (room_to_grow - amount_grown)) {
1801 // This one won't fit anyway. Get rid of it.
1802 call->make_cold();
1803 continue;
1804 }
1805 call->make_hot();
1806 calls_made_hot++;
1807 amount_grown += est_size;
1808 amount_to_grow -= est_size;
1809 }
1810
1811 if (calls_made_hot > 0) set_major_progress();
1812 return calls_made_hot;
1813 }
1814
1815
1816 //----------------------------Finish_Warm--------------------------------------
1817 void Compile::Finish_Warm() {
1818 if (!InlineWarmCalls) return;
1819 if (failing()) return;
1820 if (warm_calls() == NULL) return;
1821
1822 // Clean up loose ends, if we are out of space for inlining.
1823 WarmCallInfo* call;
1824 while ((call = pop_warm_call()) != NULL) {
1825 call->make_cold();
1826 }
1827 }
1828
1829 //---------------------cleanup_loop_predicates-----------------------
1830 // Remove the opaque nodes that protect the predicates so that all unused
1831 // checks and uncommon_traps will be eliminated from the ideal graph
1832 void Compile::cleanup_loop_predicates(PhaseIterGVN &igvn) {
1833 if (predicate_count()==0) return;
1834 for (int i = predicate_count(); i > 0; i--) {
1835 Node * n = predicate_opaque1_node(i-1);
1836 assert(n->Opcode() == Op_Opaque1, "must be");
1837 igvn.replace_node(n, n->in(1));
1838 }
1839 assert(predicate_count()==0, "should be clean!");
1840 }
1841
1842 // StringOpts and late inlining of string methods
1843 void Compile::inline_string_calls(bool parse_time) {
1844 {
1845 // remove useless nodes to make the usage analysis simpler
1846 ResourceMark rm;
1847 PhaseRemoveUseless pru(initial_gvn(), for_igvn());
1848 }
1849
1850 {
1851 ResourceMark rm;
1852 print_method(PHASE_BEFORE_STRINGOPTS, 3);
1853 PhaseStringOpts pso(initial_gvn(), for_igvn());
1854 print_method(PHASE_AFTER_STRINGOPTS, 3);
1855 }
1856
1857 // now inline anything that we skipped the first time around
1858 if (!parse_time) {
1859 _late_inlines_pos = _late_inlines.length();
1860 }
1861
1862 while (_string_late_inlines.length() > 0) {
1863 CallGenerator* cg = _string_late_inlines.pop();
1864 cg->do_late_inline();
1865 if (failing()) return;
1866 }
1867 _string_late_inlines.trunc_to(0);
1868 }
1869
1870 // Late inlining of boxing methods
1871 void Compile::inline_boxing_calls(PhaseIterGVN& igvn) {
1872 if (_boxing_late_inlines.length() > 0) {
1873 assert(has_boxed_value(), "inconsistent");
1874
1875 PhaseGVN* gvn = initial_gvn();
1876 set_inlining_incrementally(true);
1877
1878 assert( igvn._worklist.size() == 0, "should be done with igvn" );
1879 for_igvn()->clear();
1880 gvn->replace_with(&igvn);
1881
1882 while (_boxing_late_inlines.length() > 0) {
1883 CallGenerator* cg = _boxing_late_inlines.pop();
1884 cg->do_late_inline();
1885 if (failing()) return;
1886 }
1887 _boxing_late_inlines.trunc_to(0);
1888
1889 {
1890 ResourceMark rm;
1891 PhaseRemoveUseless pru(gvn, for_igvn());
1892 }
1893
1894 igvn = PhaseIterGVN(gvn);
1895 igvn.optimize();
1896
1897 set_inlining_progress(false);
1898 set_inlining_incrementally(false);
1899 }
1900 }
1901
1902 void Compile::inline_incrementally_one(PhaseIterGVN& igvn) {
1903 assert(IncrementalInline, "incremental inlining should be on");
1904 PhaseGVN* gvn = initial_gvn();
1905
1906 set_inlining_progress(false);
1907 for_igvn()->clear();
1908 gvn->replace_with(&igvn);
1909
1910 int i = 0;
1911
1912 for (; i <_late_inlines.length() && !inlining_progress(); i++) {
1913 CallGenerator* cg = _late_inlines.at(i);
1914 _late_inlines_pos = i+1;
1915 cg->do_late_inline();
1916 if (failing()) return;
1917 }
1918 int j = 0;
1919 for (; i < _late_inlines.length(); i++, j++) {
1920 _late_inlines.at_put(j, _late_inlines.at(i));
1921 }
1922 _late_inlines.trunc_to(j);
1923
1924 {
1925 ResourceMark rm;
1926 PhaseRemoveUseless pru(gvn, for_igvn());
1927 }
1928
1929 igvn = PhaseIterGVN(gvn);
1930 }
1931
1932 // Perform incremental inlining until bound on number of live nodes is reached
1933 void Compile::inline_incrementally(PhaseIterGVN& igvn) {
1934 PhaseGVN* gvn = initial_gvn();
1935
1936 set_inlining_incrementally(true);
1937 set_inlining_progress(true);
1938 uint low_live_nodes = 0;
1939
1940 while(inlining_progress() && _late_inlines.length() > 0) {
1941
1942 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) {
1943 if (low_live_nodes < (uint)LiveNodeCountInliningCutoff * 8 / 10) {
1944 // PhaseIdealLoop is expensive so we only try it once we are
1945 // out of loop and we only try it again if the previous helped
1946 // got the number of nodes down significantly
1947 PhaseIdealLoop ideal_loop( igvn, false, true );
1948 if (failing()) return;
1949 low_live_nodes = live_nodes();
1950 _major_progress = true;
1951 }
1952
1953 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) {
1954 break;
1955 }
1956 }
1957
1958 inline_incrementally_one(igvn);
1959
1960 if (failing()) return;
1961
1962 igvn.optimize();
1963
1964 if (failing()) return;
1965 }
1966
1967 assert( igvn._worklist.size() == 0, "should be done with igvn" );
1968
1969 if (_string_late_inlines.length() > 0) {
1970 assert(has_stringbuilder(), "inconsistent");
1971 for_igvn()->clear();
1972 initial_gvn()->replace_with(&igvn);
1973
1974 inline_string_calls(false);
1975
1976 if (failing()) return;
1977
1978 {
1979 ResourceMark rm;
1980 PhaseRemoveUseless pru(initial_gvn(), for_igvn());
1981 }
1982
1983 igvn = PhaseIterGVN(gvn);
1984
1985 igvn.optimize();
1986 }
1987
1988 set_inlining_incrementally(false);
1989 }
1990
1991
1992 //------------------------------Optimize---------------------------------------
1993 // Given a graph, optimize it.
1994 void Compile::Optimize() {
1995 TracePhase t1("optimizer", &_t_optimizer, true);
1996
1997 #ifndef PRODUCT
1998 if (env()->break_at_compile()) {
1999 BREAKPOINT;
2000 }
2001
2002 #endif
2003
2004 ResourceMark rm;
2005 int loop_opts_cnt;
2006
2007 print_inlining_reinit();
2008
2009 NOT_PRODUCT( verify_graph_edges(); )
2010
2011 print_method(PHASE_AFTER_PARSING);
2012
2013 {
2014 // Iterative Global Value Numbering, including ideal transforms
2015 // Initialize IterGVN with types and values from parse-time GVN
2016 PhaseIterGVN igvn(initial_gvn());
2017 {
2018 NOT_PRODUCT( TracePhase t2("iterGVN", &_t_iterGVN, TimeCompiler); )
2019 igvn.optimize();
2020 }
2021
2022 print_method(PHASE_ITER_GVN1, 2);
2023
2024 if (failing()) return;
2025
2026 {
2027 NOT_PRODUCT( TracePhase t2("incrementalInline", &_t_incrInline, TimeCompiler); )
2028 inline_incrementally(igvn);
2029 }
2030
2031 print_method(PHASE_INCREMENTAL_INLINE, 2);
2032
2033 if (failing()) return;
2034
2035 if (eliminate_boxing()) {
2036 NOT_PRODUCT( TracePhase t2("incrementalInline", &_t_incrInline, TimeCompiler); )
2037 // Inline valueOf() methods now.
2038 inline_boxing_calls(igvn);
2039
2040 print_method(PHASE_INCREMENTAL_BOXING_INLINE, 2);
2041
2042 if (failing()) return;
2043 }
2044
2045 // Remove the speculative part of types and clean up the graph from
2046 // the extra CastPP nodes whose only purpose is to carry them. Do
2047 // that early so that optimizations are not disrupted by the extra
2048 // CastPP nodes.
2049 remove_speculative_types(igvn);
2050
2051 // No more new expensive nodes will be added to the list from here
2052 // so keep only the actual candidates for optimizations.
2053 cleanup_expensive_nodes(igvn);
2054
2055 // Perform escape analysis
2056 if (_do_escape_analysis && ConnectionGraph::has_candidates(this)) {
2057 if (has_loops()) {
2058 // Cleanup graph (remove dead nodes).
2059 TracePhase t2("idealLoop", &_t_idealLoop, true);
2060 PhaseIdealLoop ideal_loop( igvn, false, true );
2061 if (major_progress()) print_method(PHASE_PHASEIDEAL_BEFORE_EA, 2);
2062 if (failing()) return;
2063 }
2064 ConnectionGraph::do_analysis(this, &igvn);
2065
2066 if (failing()) return;
2067
2068 // Optimize out fields loads from scalar replaceable allocations.
2069 igvn.optimize();
2070 print_method(PHASE_ITER_GVN_AFTER_EA, 2);
2071
2072 if (failing()) return;
2073
2074 if (congraph() != NULL && macro_count() > 0) {
2075 NOT_PRODUCT( TracePhase t2("macroEliminate", &_t_macroEliminate, TimeCompiler); )
2076 PhaseMacroExpand mexp(igvn);
2077 mexp.eliminate_macro_nodes();
2078 igvn.set_delay_transform(false);
2079
2080 igvn.optimize();
2081 print_method(PHASE_ITER_GVN_AFTER_ELIMINATION, 2);
2082
2083 if (failing()) return;
2084 }
2085 }
2086
2087 // Loop transforms on the ideal graph. Range Check Elimination,
2088 // peeling, unrolling, etc.
2089
2090 // Set loop opts counter
2091 loop_opts_cnt = num_loop_opts();
2092 if((loop_opts_cnt > 0) && (has_loops() || has_split_ifs())) {
2093 {
2094 TracePhase t2("idealLoop", &_t_idealLoop, true);
2095 PhaseIdealLoop ideal_loop( igvn, true );
2096 loop_opts_cnt--;
2097 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP1, 2);
2098 if (failing()) return;
2099 }
2100 // Loop opts pass if partial peeling occurred in previous pass
2101 if(PartialPeelLoop && major_progress() && (loop_opts_cnt > 0)) {
2102 TracePhase t3("idealLoop", &_t_idealLoop, true);
2103 PhaseIdealLoop ideal_loop( igvn, false );
2104 loop_opts_cnt--;
2105 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP2, 2);
2106 if (failing()) return;
2107 }
2108 // Loop opts pass for loop-unrolling before CCP
2109 if(major_progress() && (loop_opts_cnt > 0)) {
2110 TracePhase t4("idealLoop", &_t_idealLoop, true);
2111 PhaseIdealLoop ideal_loop( igvn, false );
2112 loop_opts_cnt--;
2113 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP3, 2);
2114 }
2115 if (!failing()) {
2116 // Verify that last round of loop opts produced a valid graph
2117 NOT_PRODUCT( TracePhase t2("idealLoopVerify", &_t_idealLoopVerify, TimeCompiler); )
2118 PhaseIdealLoop::verify(igvn);
2119 }
2120 }
2121 if (failing()) return;
2122
2123 // Conditional Constant Propagation;
2124 PhaseCCP ccp( &igvn );
2125 assert( true, "Break here to ccp.dump_nodes_and_types(_root,999,1)");
2126 {
2127 TracePhase t2("ccp", &_t_ccp, true);
2128 ccp.do_transform();
2129 }
2130 print_method(PHASE_CPP1, 2);
2131
2132 assert( true, "Break here to ccp.dump_old2new_map()");
2133
2134 // Iterative Global Value Numbering, including ideal transforms
2135 {
2136 NOT_PRODUCT( TracePhase t2("iterGVN2", &_t_iterGVN2, TimeCompiler); )
2137 igvn = ccp;
2138 igvn.optimize();
2139 }
2140
2141 print_method(PHASE_ITER_GVN2, 2);
2142
2143 if (failing()) return;
2144
2145 // Loop transforms on the ideal graph. Range Check Elimination,
2146 // peeling, unrolling, etc.
2147 if(loop_opts_cnt > 0) {
2148 debug_only( int cnt = 0; );
2149 while(major_progress() && (loop_opts_cnt > 0)) {
2150 TracePhase t2("idealLoop", &_t_idealLoop, true);
2151 assert( cnt++ < 40, "infinite cycle in loop optimization" );
2152 PhaseIdealLoop ideal_loop( igvn, true);
2153 loop_opts_cnt--;
2154 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP_ITERATIONS, 2);
2155 if (failing()) return;
2156 }
2157 }
2158
2159 {
2160 // Verify that all previous optimizations produced a valid graph
2161 // at least to this point, even if no loop optimizations were done.
2162 NOT_PRODUCT( TracePhase t2("idealLoopVerify", &_t_idealLoopVerify, TimeCompiler); )
2163 PhaseIdealLoop::verify(igvn);
2164 }
2165
2166 {
2167 NOT_PRODUCT( TracePhase t2("macroExpand", &_t_macroExpand, TimeCompiler); )
2168 PhaseMacroExpand mex(igvn);
2169 if (mex.expand_macro_nodes()) {
2170 assert(failing(), "must bail out w/ explicit message");
2171 return;
2172 }
2173 }
2174
2175 } // (End scope of igvn; run destructor if necessary for asserts.)
2176
2177 dump_inlining();
2178 // A method with only infinite loops has no edges entering loops from root
2179 {
2180 NOT_PRODUCT( TracePhase t2("graphReshape", &_t_graphReshaping, TimeCompiler); )
2181 if (final_graph_reshaping()) {
2182 assert(failing(), "must bail out w/ explicit message");
2183 return;
2184 }
2185 }
2186
2187 print_method(PHASE_OPTIMIZE_FINISHED, 2);
2188 }
2189
2190
2191 //------------------------------Code_Gen---------------------------------------
2192 // Given a graph, generate code for it
2193 void Compile::Code_Gen() {
2194 if (failing()) {
2195 return;
2196 }
2197
2198 // Perform instruction selection. You might think we could reclaim Matcher
2199 // memory PDQ, but actually the Matcher is used in generating spill code.
2200 // Internals of the Matcher (including some VectorSets) must remain live
2201 // for awhile - thus I cannot reclaim Matcher memory lest a VectorSet usage
2202 // set a bit in reclaimed memory.
2203
2204 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine
2205 // nodes. Mapping is only valid at the root of each matched subtree.
2206 NOT_PRODUCT( verify_graph_edges(); )
2207
2208 Matcher matcher;
2209 _matcher = &matcher;
2210 {
2211 TracePhase t2("matcher", &_t_matcher, true);
2212 matcher.match();
2213 }
2214 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine
2215 // nodes. Mapping is only valid at the root of each matched subtree.
2216 NOT_PRODUCT( verify_graph_edges(); )
2217
2218 // If you have too many nodes, or if matching has failed, bail out
2219 check_node_count(0, "out of nodes matching instructions");
2220 if (failing()) {
2221 return;
2222 }
2223
2224 // Build a proper-looking CFG
2225 PhaseCFG cfg(node_arena(), root(), matcher);
2226 _cfg = &cfg;
2227 {
2228 NOT_PRODUCT( TracePhase t2("scheduler", &_t_scheduler, TimeCompiler); )
2229 bool success = cfg.do_global_code_motion();
2230 if (!success) {
2231 return;
2232 }
2233
2234 print_method(PHASE_GLOBAL_CODE_MOTION, 2);
2235 NOT_PRODUCT( verify_graph_edges(); )
2236 debug_only( cfg.verify(); )
2237 }
2238
2239 PhaseChaitin regalloc(unique(), cfg, matcher);
2240 _regalloc = ®alloc;
2241 {
2242 TracePhase t2("regalloc", &_t_registerAllocation, true);
2243 // Perform register allocation. After Chaitin, use-def chains are
2244 // no longer accurate (at spill code) and so must be ignored.
2245 // Node->LRG->reg mappings are still accurate.
2246 _regalloc->Register_Allocate();
2247
2248 // Bail out if the allocator builds too many nodes
2249 if (failing()) {
2250 return;
2251 }
2252 }
2253
2254 // Prior to register allocation we kept empty basic blocks in case the
2255 // the allocator needed a place to spill. After register allocation we
2256 // are not adding any new instructions. If any basic block is empty, we
2257 // can now safely remove it.
2258 {
2259 NOT_PRODUCT( TracePhase t2("blockOrdering", &_t_blockOrdering, TimeCompiler); )
2260 cfg.remove_empty_blocks();
2261 if (do_freq_based_layout()) {
2262 PhaseBlockLayout layout(cfg);
2263 } else {
2264 cfg.set_loop_alignment();
2265 }
2266 cfg.fixup_flow();
2267 }
2268
2269 // Apply peephole optimizations
2270 if( OptoPeephole ) {
2271 NOT_PRODUCT( TracePhase t2("peephole", &_t_peephole, TimeCompiler); )
2272 PhasePeephole peep( _regalloc, cfg);
2273 peep.do_transform();
2274 }
2275
2276 // Do late expand if CPU requires this.
2277 if (Matcher::require_postalloc_expand) {
2278 NOT_PRODUCT(TracePhase t2c("postalloc_expand", &_t_postalloc_expand, true));
2279 cfg.postalloc_expand(_regalloc);
2280 }
2281
2282 // Convert Nodes to instruction bits in a buffer
2283 {
2284 // %%%% workspace merge brought two timers together for one job
2285 TracePhase t2a("output", &_t_output, true);
2286 NOT_PRODUCT( TraceTime t2b(NULL, &_t_codeGeneration, TimeCompiler, false); )
2287 Output();
2288 }
2289
2290 print_method(PHASE_FINAL_CODE);
2291
2292 // He's dead, Jim.
2293 _cfg = (PhaseCFG*)0xdeadbeef;
2294 _regalloc = (PhaseChaitin*)0xdeadbeef;
2295 }
2296
2297
2298 //------------------------------dump_asm---------------------------------------
2299 // Dump formatted assembly
2300 #ifndef PRODUCT
2301 void Compile::dump_asm(int *pcs, uint pc_limit) {
2302 bool cut_short = false;
2303 tty->print_cr("#");
2304 tty->print("# "); _tf->dump(); tty->cr();
2305 tty->print_cr("#");
2306
2307 // For all blocks
2308 int pc = 0x0; // Program counter
2309 char starts_bundle = ' ';
2310 _regalloc->dump_frame();
2311
2312 Node *n = NULL;
2313 for (uint i = 0; i < _cfg->number_of_blocks(); i++) {
2314 if (VMThread::should_terminate()) {
2315 cut_short = true;
2316 break;
2317 }
2318 Block* block = _cfg->get_block(i);
2319 if (block->is_connector() && !Verbose) {
2320 continue;
2321 }
2322 n = block->head();
2323 if (pcs && n->_idx < pc_limit) {
2324 tty->print("%3.3x ", pcs[n->_idx]);
2325 } else {
2326 tty->print(" ");
2327 }
2328 block->dump_head(_cfg);
2329 if (block->is_connector()) {
2330 tty->print_cr(" # Empty connector block");
2331 } else if (block->num_preds() == 2 && block->pred(1)->is_CatchProj() && block->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) {
2332 tty->print_cr(" # Block is sole successor of call");
2333 }
2334
2335 // For all instructions
2336 Node *delay = NULL;
2337 for (uint j = 0; j < block->number_of_nodes(); j++) {
2338 if (VMThread::should_terminate()) {
2339 cut_short = true;
2340 break;
2341 }
2342 n = block->get_node(j);
2343 if (valid_bundle_info(n)) {
2344 Bundle* bundle = node_bundling(n);
2345 if (bundle->used_in_unconditional_delay()) {
2346 delay = n;
2347 continue;
2348 }
2349 if (bundle->starts_bundle()) {
2350 starts_bundle = '+';
2351 }
2352 }
2353
2354 if (WizardMode) {
2355 n->dump();
2356 }
2357
2358 if( !n->is_Region() && // Dont print in the Assembly
2359 !n->is_Phi() && // a few noisely useless nodes
2360 !n->is_Proj() &&
2361 !n->is_MachTemp() &&
2362 !n->is_SafePointScalarObject() &&
2363 !n->is_Catch() && // Would be nice to print exception table targets
2364 !n->is_MergeMem() && // Not very interesting
2365 !n->is_top() && // Debug info table constants
2366 !(n->is_Con() && !n->is_Mach())// Debug info table constants
2367 ) {
2368 if (pcs && n->_idx < pc_limit)
2369 tty->print("%3.3x", pcs[n->_idx]);
2370 else
2371 tty->print(" ");
2372 tty->print(" %c ", starts_bundle);
2373 starts_bundle = ' ';
2374 tty->print("\t");
2375 n->format(_regalloc, tty);
2376 tty->cr();
2377 }
2378
2379 // If we have an instruction with a delay slot, and have seen a delay,
2380 // then back up and print it
2381 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
2382 assert(delay != NULL, "no unconditional delay instruction");
2383 if (WizardMode) delay->dump();
2384
2385 if (node_bundling(delay)->starts_bundle())
2386 starts_bundle = '+';
2387 if (pcs && n->_idx < pc_limit)
2388 tty->print("%3.3x", pcs[n->_idx]);
2389 else
2390 tty->print(" ");
2391 tty->print(" %c ", starts_bundle);
2392 starts_bundle = ' ';
2393 tty->print("\t");
2394 delay->format(_regalloc, tty);
2395 tty->print_cr("");
2396 delay = NULL;
2397 }
2398
2399 // Dump the exception table as well
2400 if( n->is_Catch() && (Verbose || WizardMode) ) {
2401 // Print the exception table for this offset
2402 _handler_table.print_subtable_for(pc);
2403 }
2404 }
2405
2406 if (pcs && n->_idx < pc_limit)
2407 tty->print_cr("%3.3x", pcs[n->_idx]);
2408 else
2409 tty->print_cr("");
2410
2411 assert(cut_short || delay == NULL, "no unconditional delay branch");
2412
2413 } // End of per-block dump
2414 tty->print_cr("");
2415
2416 if (cut_short) tty->print_cr("*** disassembly is cut short ***");
2417 }
2418 #endif
2419
2420 //------------------------------Final_Reshape_Counts---------------------------
2421 // This class defines counters to help identify when a method
2422 // may/must be executed using hardware with only 24-bit precision.
2423 struct Final_Reshape_Counts : public StackObj {
2424 int _call_count; // count non-inlined 'common' calls
2425 int _float_count; // count float ops requiring 24-bit precision
2426 int _double_count; // count double ops requiring more precision
2427 int _java_call_count; // count non-inlined 'java' calls
2428 int _inner_loop_count; // count loops which need alignment
2429 VectorSet _visited; // Visitation flags
2430 Node_List _tests; // Set of IfNodes & PCTableNodes
2431
2432 Final_Reshape_Counts() :
2433 _call_count(0), _float_count(0), _double_count(0),
2434 _java_call_count(0), _inner_loop_count(0),
2435 _visited( Thread::current()->resource_area() ) { }
2436
2437 void inc_call_count () { _call_count ++; }
2438 void inc_float_count () { _float_count ++; }
2439 void inc_double_count() { _double_count++; }
2440 void inc_java_call_count() { _java_call_count++; }
2441 void inc_inner_loop_count() { _inner_loop_count++; }
2442
2443 int get_call_count () const { return _call_count ; }
2444 int get_float_count () const { return _float_count ; }
2445 int get_double_count() const { return _double_count; }
2446 int get_java_call_count() const { return _java_call_count; }
2447 int get_inner_loop_count() const { return _inner_loop_count; }
2448 };
2449
2450 #ifdef ASSERT
2451 static bool oop_offset_is_sane(const TypeInstPtr* tp) {
2452 ciInstanceKlass *k = tp->klass()->as_instance_klass();
2453 // Make sure the offset goes inside the instance layout.
2454 return k->contains_field_offset(tp->offset());
2455 // Note that OffsetBot and OffsetTop are very negative.
2456 }
2457 #endif
2458
2459 // Eliminate trivially redundant StoreCMs and accumulate their
2460 // precedence edges.
2461 void Compile::eliminate_redundant_card_marks(Node* n) {
2462 assert(n->Opcode() == Op_StoreCM, "expected StoreCM");
2463 if (n->in(MemNode::Address)->outcnt() > 1) {
2464 // There are multiple users of the same address so it might be
2465 // possible to eliminate some of the StoreCMs
2466 Node* mem = n->in(MemNode::Memory);
2467 Node* adr = n->in(MemNode::Address);
2468 Node* val = n->in(MemNode::ValueIn);
2469 Node* prev = n;
2470 bool done = false;
2471 // Walk the chain of StoreCMs eliminating ones that match. As
2472 // long as it's a chain of single users then the optimization is
2473 // safe. Eliminating partially redundant StoreCMs would require
2474 // cloning copies down the other paths.
2475 while (mem->Opcode() == Op_StoreCM && mem->outcnt() == 1 && !done) {
2476 if (adr == mem->in(MemNode::Address) &&
2477 val == mem->in(MemNode::ValueIn)) {
2478 // redundant StoreCM
2479 if (mem->req() > MemNode::OopStore) {
2480 // Hasn't been processed by this code yet.
2481 n->add_prec(mem->in(MemNode::OopStore));
2482 } else {
2483 // Already converted to precedence edge
2484 for (uint i = mem->req(); i < mem->len(); i++) {
2485 // Accumulate any precedence edges
2486 if (mem->in(i) != NULL) {
2487 n->add_prec(mem->in(i));
2488 }
2489 }
2490 // Everything above this point has been processed.
2491 done = true;
2492 }
2493 // Eliminate the previous StoreCM
2494 prev->set_req(MemNode::Memory, mem->in(MemNode::Memory));
2495 assert(mem->outcnt() == 0, "should be dead");
2496 mem->disconnect_inputs(NULL, this);
2497 } else {
2498 prev = mem;
2499 }
2500 mem = prev->in(MemNode::Memory);
2501 }
2502 }
2503 }
2504
2505 //------------------------------final_graph_reshaping_impl----------------------
2506 // Implement items 1-5 from final_graph_reshaping below.
2507 void Compile::final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc) {
2508
2509 if ( n->outcnt() == 0 ) return; // dead node
2510 uint nop = n->Opcode();
2511
2512 // Check for 2-input instruction with "last use" on right input.
2513 // Swap to left input. Implements item (2).
2514 if( n->req() == 3 && // two-input instruction
2515 n->in(1)->outcnt() > 1 && // left use is NOT a last use
2516 (!n->in(1)->is_Phi() || n->in(1)->in(2) != n) && // it is not data loop
2517 n->in(2)->outcnt() == 1 &&// right use IS a last use
2518 !n->in(2)->is_Con() ) { // right use is not a constant
2519 // Check for commutative opcode
2520 switch( nop ) {
2521 case Op_AddI: case Op_AddF: case Op_AddD: case Op_AddL:
2522 case Op_MaxI: case Op_MinI:
2523 case Op_MulI: case Op_MulF: case Op_MulD: case Op_MulL:
2524 case Op_AndL: case Op_XorL: case Op_OrL:
2525 case Op_AndI: case Op_XorI: case Op_OrI: {
2526 // Move "last use" input to left by swapping inputs
2527 n->swap_edges(1, 2);
2528 break;
2529 }
2530 default:
2531 break;
2532 }
2533 }
2534
2535 #ifdef ASSERT
2536 if( n->is_Mem() ) {
2537 int alias_idx = get_alias_index(n->as_Mem()->adr_type());
2538 assert( n->in(0) != NULL || alias_idx != Compile::AliasIdxRaw ||
2539 // oop will be recorded in oop map if load crosses safepoint
2540 n->is_Load() && (n->as_Load()->bottom_type()->isa_oopptr() ||
2541 LoadNode::is_immutable_value(n->in(MemNode::Address))),
2542 "raw memory operations should have control edge");
2543 }
2544 #endif
2545 // Count FPU ops and common calls, implements item (3)
2546 switch( nop ) {
2547 // Count all float operations that may use FPU
2548 case Op_AddF:
2549 case Op_SubF:
2550 case Op_MulF:
2551 case Op_DivF:
2552 case Op_NegF:
2553 case Op_ModF:
2554 case Op_ConvI2F:
2555 case Op_ConF:
2556 case Op_CmpF:
2557 case Op_CmpF3:
2558 // case Op_ConvL2F: // longs are split into 32-bit halves
2559 frc.inc_float_count();
2560 break;
2561
2562 case Op_ConvF2D:
2563 case Op_ConvD2F:
2564 frc.inc_float_count();
2565 frc.inc_double_count();
2566 break;
2567
2568 // Count all double operations that may use FPU
2569 case Op_AddD:
2570 case Op_SubD:
2571 case Op_MulD:
2572 case Op_DivD:
2573 case Op_NegD:
2574 case Op_ModD:
2575 case Op_ConvI2D:
2576 case Op_ConvD2I:
2577 // case Op_ConvL2D: // handled by leaf call
2578 // case Op_ConvD2L: // handled by leaf call
2579 case Op_ConD:
2580 case Op_CmpD:
2581 case Op_CmpD3:
2582 frc.inc_double_count();
2583 break;
2584 case Op_Opaque1: // Remove Opaque Nodes before matching
2585 case Op_Opaque2: // Remove Opaque Nodes before matching
2586 n->subsume_by(n->in(1), this);
2587 break;
2588 case Op_CallStaticJava:
2589 case Op_CallJava:
2590 case Op_CallDynamicJava:
2591 frc.inc_java_call_count(); // Count java call site;
2592 case Op_CallRuntime:
2593 case Op_CallLeaf:
2594 case Op_CallLeafNoFP: {
2595 assert( n->is_Call(), "" );
2596 CallNode *call = n->as_Call();
2597 // Count call sites where the FP mode bit would have to be flipped.
2598 // Do not count uncommon runtime calls:
2599 // uncommon_trap, _complete_monitor_locking, _complete_monitor_unlocking,
2600 // _new_Java, _new_typeArray, _new_objArray, _rethrow_Java, ...
2601 if( !call->is_CallStaticJava() || !call->as_CallStaticJava()->_name ) {
2602 frc.inc_call_count(); // Count the call site
2603 } else { // See if uncommon argument is shared
2604 Node *n = call->in(TypeFunc::Parms);
2605 int nop = n->Opcode();
2606 // Clone shared simple arguments to uncommon calls, item (1).
2607 if( n->outcnt() > 1 &&
2608 !n->is_Proj() &&
2609 nop != Op_CreateEx &&
2610 nop != Op_CheckCastPP &&
2611 nop != Op_DecodeN &&
2612 nop != Op_DecodeNKlass &&
2613 !n->is_Mem() ) {
2614 Node *x = n->clone();
2615 call->set_req( TypeFunc::Parms, x );
2616 }
2617 }
2618 break;
2619 }
2620
2621 case Op_StoreD:
2622 case Op_LoadD:
2623 case Op_LoadD_unaligned:
2624 frc.inc_double_count();
2625 goto handle_mem;
2626 case Op_StoreF:
2627 case Op_LoadF:
2628 frc.inc_float_count();
2629 goto handle_mem;
2630
2631 case Op_StoreCM:
2632 {
2633 // Convert OopStore dependence into precedence edge
2634 Node* prec = n->in(MemNode::OopStore);
2635 n->del_req(MemNode::OopStore);
2636 n->add_prec(prec);
2637 eliminate_redundant_card_marks(n);
2638 }
2639
2640 // fall through
2641
2642 case Op_StoreB:
2643 case Op_StoreC:
2644 case Op_StorePConditional:
2645 case Op_StoreI:
2646 case Op_StoreL:
2647 case Op_StoreIConditional:
2648 case Op_StoreLConditional:
2649 case Op_CompareAndSwapI:
2650 case Op_CompareAndSwapL:
2651 case Op_CompareAndSwapP:
2652 case Op_CompareAndSwapN:
2653 case Op_GetAndAddI:
2654 case Op_GetAndAddL:
2655 case Op_GetAndSetI:
2656 case Op_GetAndSetL:
2657 case Op_GetAndSetP:
2658 case Op_GetAndSetN:
2659 case Op_StoreP:
2660 case Op_StoreN:
2661 case Op_StoreNKlass:
2662 case Op_LoadB:
2663 case Op_LoadUB:
2664 case Op_LoadUS:
2665 case Op_LoadI:
2666 case Op_LoadKlass:
2667 case Op_LoadNKlass:
2668 case Op_LoadL:
2669 case Op_LoadL_unaligned:
2670 case Op_LoadPLocked:
2671 case Op_LoadP:
2672 case Op_LoadN:
2673 case Op_LoadRange:
2674 case Op_LoadS: {
2675 handle_mem:
2676 #ifdef ASSERT
2677 if( VerifyOptoOopOffsets ) {
2678 assert( n->is_Mem(), "" );
2679 MemNode *mem = (MemNode*)n;
2680 // Check to see if address types have grounded out somehow.
2681 const TypeInstPtr *tp = mem->in(MemNode::Address)->bottom_type()->isa_instptr();
2682 assert( !tp || oop_offset_is_sane(tp), "" );
2683 }
2684 #endif
2685 break;
2686 }
2687
2688 case Op_AddP: { // Assert sane base pointers
2689 Node *addp = n->in(AddPNode::Address);
2690 assert( !addp->is_AddP() ||
2691 addp->in(AddPNode::Base)->is_top() || // Top OK for allocation
2692 addp->in(AddPNode::Base) == n->in(AddPNode::Base),
2693 "Base pointers must match" );
2694 #ifdef _LP64
2695 if ((UseCompressedOops || UseCompressedClassPointers) &&
2696 addp->Opcode() == Op_ConP &&
2697 addp == n->in(AddPNode::Base) &&
2698 n->in(AddPNode::Offset)->is_Con()) {
2699 // Use addressing with narrow klass to load with offset on x86.
2700 // On sparc loading 32-bits constant and decoding it have less
2701 // instructions (4) then load 64-bits constant (7).
2702 // Do this transformation here since IGVN will convert ConN back to ConP.
2703 const Type* t = addp->bottom_type();
2704 if (t->isa_oopptr() || t->isa_klassptr()) {
2705 Node* nn = NULL;
2706
2707 int op = t->isa_oopptr() ? Op_ConN : Op_ConNKlass;
2708
2709 // Look for existing ConN node of the same exact type.
2710 Node* r = root();
2711 uint cnt = r->outcnt();
2712 for (uint i = 0; i < cnt; i++) {
2713 Node* m = r->raw_out(i);
2714 if (m!= NULL && m->Opcode() == op &&
2715 m->bottom_type()->make_ptr() == t) {
2716 nn = m;
2717 break;
2718 }
2719 }
2720 if (nn != NULL) {
2721 // Decode a narrow oop to match address
2722 // [R12 + narrow_oop_reg<<3 + offset]
2723 if (t->isa_oopptr()) {
2724 nn = new (this) DecodeNNode(nn, t);
2725 } else {
2726 nn = new (this) DecodeNKlassNode(nn, t);
2727 }
2728 n->set_req(AddPNode::Base, nn);
2729 n->set_req(AddPNode::Address, nn);
2730 if (addp->outcnt() == 0) {
2731 addp->disconnect_inputs(NULL, this);
2732 }
2733 }
2734 }
2735 }
2736 #endif
2737 break;
2738 }
2739
2740 #ifdef _LP64
2741 case Op_CastPP:
2742 if (n->in(1)->is_DecodeN() && Matcher::gen_narrow_oop_implicit_null_checks()) {
2743 Node* in1 = n->in(1);
2744 const Type* t = n->bottom_type();
2745 Node* new_in1 = in1->clone();
2746 new_in1->as_DecodeN()->set_type(t);
2747
2748 if (!Matcher::narrow_oop_use_complex_address()) {
2749 //
2750 // x86, ARM and friends can handle 2 adds in addressing mode
2751 // and Matcher can fold a DecodeN node into address by using
2752 // a narrow oop directly and do implicit NULL check in address:
2753 //
2754 // [R12 + narrow_oop_reg<<3 + offset]
2755 // NullCheck narrow_oop_reg
2756 //
2757 // On other platforms (Sparc) we have to keep new DecodeN node and
2758 // use it to do implicit NULL check in address:
2759 //
2760 // decode_not_null narrow_oop_reg, base_reg
2761 // [base_reg + offset]
2762 // NullCheck base_reg
2763 //
2764 // Pin the new DecodeN node to non-null path on these platform (Sparc)
2765 // to keep the information to which NULL check the new DecodeN node
2766 // corresponds to use it as value in implicit_null_check().
2767 //
2768 new_in1->set_req(0, n->in(0));
2769 }
2770
2771 n->subsume_by(new_in1, this);
2772 if (in1->outcnt() == 0) {
2773 in1->disconnect_inputs(NULL, this);
2774 }
2775 }
2776 break;
2777
2778 case Op_CmpP:
2779 // Do this transformation here to preserve CmpPNode::sub() and
2780 // other TypePtr related Ideal optimizations (for example, ptr nullness).
2781 if (n->in(1)->is_DecodeNarrowPtr() || n->in(2)->is_DecodeNarrowPtr()) {
2782 Node* in1 = n->in(1);
2783 Node* in2 = n->in(2);
2784 if (!in1->is_DecodeNarrowPtr()) {
2785 in2 = in1;
2786 in1 = n->in(2);
2787 }
2788 assert(in1->is_DecodeNarrowPtr(), "sanity");
2789
2790 Node* new_in2 = NULL;
2791 if (in2->is_DecodeNarrowPtr()) {
2792 assert(in2->Opcode() == in1->Opcode(), "must be same node type");
2793 new_in2 = in2->in(1);
2794 } else if (in2->Opcode() == Op_ConP) {
2795 const Type* t = in2->bottom_type();
2796 if (t == TypePtr::NULL_PTR) {
2797 assert(in1->is_DecodeN(), "compare klass to null?");
2798 // Don't convert CmpP null check into CmpN if compressed
2799 // oops implicit null check is not generated.
2800 // This will allow to generate normal oop implicit null check.
2801 if (Matcher::gen_narrow_oop_implicit_null_checks())
2802 new_in2 = ConNode::make(this, TypeNarrowOop::NULL_PTR);
2803 //
2804 // This transformation together with CastPP transformation above
2805 // will generated code for implicit NULL checks for compressed oops.
2806 //
2807 // The original code after Optimize()
2808 //
2809 // LoadN memory, narrow_oop_reg
2810 // decode narrow_oop_reg, base_reg
2811 // CmpP base_reg, NULL
2812 // CastPP base_reg // NotNull
2813 // Load [base_reg + offset], val_reg
2814 //
2815 // after these transformations will be
2816 //
2817 // LoadN memory, narrow_oop_reg
2818 // CmpN narrow_oop_reg, NULL
2819 // decode_not_null narrow_oop_reg, base_reg
2820 // Load [base_reg + offset], val_reg
2821 //
2822 // and the uncommon path (== NULL) will use narrow_oop_reg directly
2823 // since narrow oops can be used in debug info now (see the code in
2824 // final_graph_reshaping_walk()).
2825 //
2826 // At the end the code will be matched to
2827 // on x86:
2828 //
2829 // Load_narrow_oop memory, narrow_oop_reg
2830 // Load [R12 + narrow_oop_reg<<3 + offset], val_reg
2831 // NullCheck narrow_oop_reg
2832 //
2833 // and on sparc:
2834 //
2835 // Load_narrow_oop memory, narrow_oop_reg
2836 // decode_not_null narrow_oop_reg, base_reg
2837 // Load [base_reg + offset], val_reg
2838 // NullCheck base_reg
2839 //
2840 } else if (t->isa_oopptr()) {
2841 new_in2 = ConNode::make(this, t->make_narrowoop());
2842 } else if (t->isa_klassptr()) {
2843 new_in2 = ConNode::make(this, t->make_narrowklass());
2844 }
2845 }
2846 if (new_in2 != NULL) {
2847 Node* cmpN = new (this) CmpNNode(in1->in(1), new_in2);
2848 n->subsume_by(cmpN, this);
2849 if (in1->outcnt() == 0) {
2850 in1->disconnect_inputs(NULL, this);
2851 }
2852 if (in2->outcnt() == 0) {
2853 in2->disconnect_inputs(NULL, this);
2854 }
2855 }
2856 }
2857 break;
2858
2859 case Op_DecodeN:
2860 case Op_DecodeNKlass:
2861 assert(!n->in(1)->is_EncodeNarrowPtr(), "should be optimized out");
2862 // DecodeN could be pinned when it can't be fold into
2863 // an address expression, see the code for Op_CastPP above.
2864 assert(n->in(0) == NULL || (UseCompressedOops && !Matcher::narrow_oop_use_complex_address()), "no control");
2865 break;
2866
2867 case Op_EncodeP:
2868 case Op_EncodePKlass: {
2869 Node* in1 = n->in(1);
2870 if (in1->is_DecodeNarrowPtr()) {
2871 n->subsume_by(in1->in(1), this);
2872 } else if (in1->Opcode() == Op_ConP) {
2873 const Type* t = in1->bottom_type();
2874 if (t == TypePtr::NULL_PTR) {
2875 assert(t->isa_oopptr(), "null klass?");
2876 n->subsume_by(ConNode::make(this, TypeNarrowOop::NULL_PTR), this);
2877 } else if (t->isa_oopptr()) {
2878 n->subsume_by(ConNode::make(this, t->make_narrowoop()), this);
2879 } else if (t->isa_klassptr()) {
2880 n->subsume_by(ConNode::make(this, t->make_narrowklass()), this);
2881 }
2882 }
2883 if (in1->outcnt() == 0) {
2884 in1->disconnect_inputs(NULL, this);
2885 }
2886 break;
2887 }
2888
2889 case Op_Proj: {
2890 if (OptimizeStringConcat) {
2891 ProjNode* p = n->as_Proj();
2892 if (p->_is_io_use) {
2893 // Separate projections were used for the exception path which
2894 // are normally removed by a late inline. If it wasn't inlined
2895 // then they will hang around and should just be replaced with
2896 // the original one.
2897 Node* proj = NULL;
2898 // Replace with just one
2899 for (SimpleDUIterator i(p->in(0)); i.has_next(); i.next()) {
2900 Node *use = i.get();
2901 if (use->is_Proj() && p != use && use->as_Proj()->_con == p->_con) {
2902 proj = use;
2903 break;
2904 }
2905 }
2906 assert(proj != NULL, "must be found");
2907 p->subsume_by(proj, this);
2908 }
2909 }
2910 break;
2911 }
2912
2913 case Op_Phi:
2914 if (n->as_Phi()->bottom_type()->isa_narrowoop() || n->as_Phi()->bottom_type()->isa_narrowklass()) {
2915 // The EncodeP optimization may create Phi with the same edges
2916 // for all paths. It is not handled well by Register Allocator.
2917 Node* unique_in = n->in(1);
2918 assert(unique_in != NULL, "");
2919 uint cnt = n->req();
2920 for (uint i = 2; i < cnt; i++) {
2921 Node* m = n->in(i);
2922 assert(m != NULL, "");
2923 if (unique_in != m)
2924 unique_in = NULL;
2925 }
2926 if (unique_in != NULL) {
2927 n->subsume_by(unique_in, this);
2928 }
2929 }
2930 break;
2931
2932 #endif
2933
2934 case Op_ModI:
2935 if (UseDivMod) {
2936 // Check if a%b and a/b both exist
2937 Node* d = n->find_similar(Op_DivI);
2938 if (d) {
2939 // Replace them with a fused divmod if supported
2940 if (Matcher::has_match_rule(Op_DivModI)) {
2941 DivModINode* divmod = DivModINode::make(this, n);
2942 d->subsume_by(divmod->div_proj(), this);
2943 n->subsume_by(divmod->mod_proj(), this);
2944 } else {
2945 // replace a%b with a-((a/b)*b)
2946 Node* mult = new (this) MulINode(d, d->in(2));
2947 Node* sub = new (this) SubINode(d->in(1), mult);
2948 n->subsume_by(sub, this);
2949 }
2950 }
2951 }
2952 break;
2953
2954 case Op_ModL:
2955 if (UseDivMod) {
2956 // Check if a%b and a/b both exist
2957 Node* d = n->find_similar(Op_DivL);
2958 if (d) {
2959 // Replace them with a fused divmod if supported
2960 if (Matcher::has_match_rule(Op_DivModL)) {
2961 DivModLNode* divmod = DivModLNode::make(this, n);
2962 d->subsume_by(divmod->div_proj(), this);
2963 n->subsume_by(divmod->mod_proj(), this);
2964 } else {
2965 // replace a%b with a-((a/b)*b)
2966 Node* mult = new (this) MulLNode(d, d->in(2));
2967 Node* sub = new (this) SubLNode(d->in(1), mult);
2968 n->subsume_by(sub, this);
2969 }
2970 }
2971 }
2972 break;
2973
2974 case Op_LoadVector:
2975 case Op_StoreVector:
2976 break;
2977
2978 case Op_PackB:
2979 case Op_PackS:
2980 case Op_PackI:
2981 case Op_PackF:
2982 case Op_PackL:
2983 case Op_PackD:
2984 if (n->req()-1 > 2) {
2985 // Replace many operand PackNodes with a binary tree for matching
2986 PackNode* p = (PackNode*) n;
2987 Node* btp = p->binary_tree_pack(this, 1, n->req());
2988 n->subsume_by(btp, this);
2989 }
2990 break;
2991 case Op_Loop:
2992 case Op_CountedLoop:
2993 if (n->as_Loop()->is_inner_loop()) {
2994 frc.inc_inner_loop_count();
2995 }
2996 break;
2997 case Op_LShiftI:
2998 case Op_RShiftI:
2999 case Op_URShiftI:
3000 case Op_LShiftL:
3001 case Op_RShiftL:
3002 case Op_URShiftL:
3003 if (Matcher::need_masked_shift_count) {
3004 // The cpu's shift instructions don't restrict the count to the
3005 // lower 5/6 bits. We need to do the masking ourselves.
3006 Node* in2 = n->in(2);
3007 juint mask = (n->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1);
3008 const TypeInt* t = in2->find_int_type();
3009 if (t != NULL && t->is_con()) {
3010 juint shift = t->get_con();
3011 if (shift > mask) { // Unsigned cmp
3012 n->set_req(2, ConNode::make(this, TypeInt::make(shift & mask)));
3013 }
3014 } else {
3015 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) {
3016 Node* shift = new (this) AndINode(in2, ConNode::make(this, TypeInt::make(mask)));
3017 n->set_req(2, shift);
3018 }
3019 }
3020 if (in2->outcnt() == 0) { // Remove dead node
3021 in2->disconnect_inputs(NULL, this);
3022 }
3023 }
3024 break;
3025 case Op_MemBarStoreStore:
3026 case Op_MemBarRelease:
3027 // Break the link with AllocateNode: it is no longer useful and
3028 // confuses register allocation.
3029 if (n->req() > MemBarNode::Precedent) {
3030 n->set_req(MemBarNode::Precedent, top());
3031 }
3032 break;
3033 default:
3034 assert( !n->is_Call(), "" );
3035 assert( !n->is_Mem(), "" );
3036 break;
3037 }
3038
3039 // Collect CFG split points
3040 if (n->is_MultiBranch())
3041 frc._tests.push(n);
3042 }
3043
3044 //------------------------------final_graph_reshaping_walk---------------------
3045 // Replacing Opaque nodes with their input in final_graph_reshaping_impl(),
3046 // requires that the walk visits a node's inputs before visiting the node.
3047 void Compile::final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Reshape_Counts &frc ) {
3048 ResourceArea *area = Thread::current()->resource_area();
3049 Unique_Node_List sfpt(area);
3050
3051 frc._visited.set(root->_idx); // first, mark node as visited
3052 uint cnt = root->req();
3053 Node *n = root;
3054 uint i = 0;
3055 while (true) {
3056 if (i < cnt) {
3057 // Place all non-visited non-null inputs onto stack
3058 Node* m = n->in(i);
3059 ++i;
3060 if (m != NULL && !frc._visited.test_set(m->_idx)) {
3061 if (m->is_SafePoint() && m->as_SafePoint()->jvms() != NULL)
3062 sfpt.push(m);
3063 cnt = m->req();
3064 nstack.push(n, i); // put on stack parent and next input's index
3065 n = m;
3066 i = 0;
3067 }
3068 } else {
3069 // Now do post-visit work
3070 final_graph_reshaping_impl( n, frc );
3071 if (nstack.is_empty())
3072 break; // finished
3073 n = nstack.node(); // Get node from stack
3074 cnt = n->req();
3075 i = nstack.index();
3076 nstack.pop(); // Shift to the next node on stack
3077 }
3078 }
3079
3080 // Skip next transformation if compressed oops are not used.
3081 if ((UseCompressedOops && !Matcher::gen_narrow_oop_implicit_null_checks()) ||
3082 (!UseCompressedOops && !UseCompressedClassPointers))
3083 return;
3084
3085 // Go over safepoints nodes to skip DecodeN/DecodeNKlass nodes for debug edges.
3086 // It could be done for an uncommon traps or any safepoints/calls
3087 // if the DecodeN/DecodeNKlass node is referenced only in a debug info.
3088 while (sfpt.size() > 0) {
3089 n = sfpt.pop();
3090 JVMState *jvms = n->as_SafePoint()->jvms();
3091 assert(jvms != NULL, "sanity");
3092 int start = jvms->debug_start();
3093 int end = n->req();
3094 bool is_uncommon = (n->is_CallStaticJava() &&
3095 n->as_CallStaticJava()->uncommon_trap_request() != 0);
3096 for (int j = start; j < end; j++) {
3097 Node* in = n->in(j);
3098 if (in->is_DecodeNarrowPtr()) {
3099 bool safe_to_skip = true;
3100 if (!is_uncommon ) {
3101 // Is it safe to skip?
3102 for (uint i = 0; i < in->outcnt(); i++) {
3103 Node* u = in->raw_out(i);
3104 if (!u->is_SafePoint() ||
3105 u->is_Call() && u->as_Call()->has_non_debug_use(n)) {
3106 safe_to_skip = false;
3107 }
3108 }
3109 }
3110 if (safe_to_skip) {
3111 n->set_req(j, in->in(1));
3112 }
3113 if (in->outcnt() == 0) {
3114 in->disconnect_inputs(NULL, this);
3115 }
3116 }
3117 }
3118 }
3119 }
3120
3121 //------------------------------final_graph_reshaping--------------------------
3122 // Final Graph Reshaping.
3123 //
3124 // (1) Clone simple inputs to uncommon calls, so they can be scheduled late
3125 // and not commoned up and forced early. Must come after regular
3126 // optimizations to avoid GVN undoing the cloning. Clone constant
3127 // inputs to Loop Phis; these will be split by the allocator anyways.
3128 // Remove Opaque nodes.
3129 // (2) Move last-uses by commutative operations to the left input to encourage
3130 // Intel update-in-place two-address operations and better register usage
3131 // on RISCs. Must come after regular optimizations to avoid GVN Ideal
3132 // calls canonicalizing them back.
3133 // (3) Count the number of double-precision FP ops, single-precision FP ops
3134 // and call sites. On Intel, we can get correct rounding either by
3135 // forcing singles to memory (requires extra stores and loads after each
3136 // FP bytecode) or we can set a rounding mode bit (requires setting and
3137 // clearing the mode bit around call sites). The mode bit is only used
3138 // if the relative frequency of single FP ops to calls is low enough.
3139 // This is a key transform for SPEC mpeg_audio.
3140 // (4) Detect infinite loops; blobs of code reachable from above but not
3141 // below. Several of the Code_Gen algorithms fail on such code shapes,
3142 // so we simply bail out. Happens a lot in ZKM.jar, but also happens
3143 // from time to time in other codes (such as -Xcomp finalizer loops, etc).
3144 // Detection is by looking for IfNodes where only 1 projection is
3145 // reachable from below or CatchNodes missing some targets.
3146 // (5) Assert for insane oop offsets in debug mode.
3147
3148 bool Compile::final_graph_reshaping() {
3149 // an infinite loop may have been eliminated by the optimizer,
3150 // in which case the graph will be empty.
3151 if (root()->req() == 1) {
3152 record_method_not_compilable("trivial infinite loop");
3153 return true;
3154 }
3155
3156 // Expensive nodes have their control input set to prevent the GVN
3157 // from freely commoning them. There's no GVN beyond this point so
3158 // no need to keep the control input. We want the expensive nodes to
3159 // be freely moved to the least frequent code path by gcm.
3160 assert(OptimizeExpensiveOps || expensive_count() == 0, "optimization off but list non empty?");
3161 for (int i = 0; i < expensive_count(); i++) {
3162 _expensive_nodes->at(i)->set_req(0, NULL);
3163 }
3164
3165 Final_Reshape_Counts frc;
3166
3167 // Visit everybody reachable!
3168 // Allocate stack of size C->unique()/2 to avoid frequent realloc
3169 Node_Stack nstack(unique() >> 1);
3170 final_graph_reshaping_walk(nstack, root(), frc);
3171
3172 // Check for unreachable (from below) code (i.e., infinite loops).
3173 for( uint i = 0; i < frc._tests.size(); i++ ) {
3174 MultiBranchNode *n = frc._tests[i]->as_MultiBranch();
3175 // Get number of CFG targets.
3176 // Note that PCTables include exception targets after calls.
3177 uint required_outcnt = n->required_outcnt();
3178 if (n->outcnt() != required_outcnt) {
3179 // Check for a few special cases. Rethrow Nodes never take the
3180 // 'fall-thru' path, so expected kids is 1 less.
3181 if (n->is_PCTable() && n->in(0) && n->in(0)->in(0)) {
3182 if (n->in(0)->in(0)->is_Call()) {
3183 CallNode *call = n->in(0)->in(0)->as_Call();
3184 if (call->entry_point() == OptoRuntime::rethrow_stub()) {
3185 required_outcnt--; // Rethrow always has 1 less kid
3186 } else if (call->req() > TypeFunc::Parms &&
3187 call->is_CallDynamicJava()) {
3188 // Check for null receiver. In such case, the optimizer has
3189 // detected that the virtual call will always result in a null
3190 // pointer exception. The fall-through projection of this CatchNode
3191 // will not be populated.
3192 Node *arg0 = call->in(TypeFunc::Parms);
3193 if (arg0->is_Type() &&
3194 arg0->as_Type()->type()->higher_equal(TypePtr::NULL_PTR)) {
3195 required_outcnt--;
3196 }
3197 } else if (call->entry_point() == OptoRuntime::new_array_Java() &&
3198 call->req() > TypeFunc::Parms+1 &&
3199 call->is_CallStaticJava()) {
3200 // Check for negative array length. In such case, the optimizer has
3201 // detected that the allocation attempt will always result in an
3202 // exception. There is no fall-through projection of this CatchNode .
3203 Node *arg1 = call->in(TypeFunc::Parms+1);
3204 if (arg1->is_Type() &&
3205 arg1->as_Type()->type()->join(TypeInt::POS)->empty()) {
3206 required_outcnt--;
3207 }
3208 }
3209 }
3210 }
3211 // Recheck with a better notion of 'required_outcnt'
3212 if (n->outcnt() != required_outcnt) {
3213 record_method_not_compilable("malformed control flow");
3214 return true; // Not all targets reachable!
3215 }
3216 }
3217 // Check that I actually visited all kids. Unreached kids
3218 // must be infinite loops.
3219 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++)
3220 if (!frc._visited.test(n->fast_out(j)->_idx)) {
3221 record_method_not_compilable("infinite loop");
3222 return true; // Found unvisited kid; must be unreach
3223 }
3224 }
3225
3226 // If original bytecodes contained a mixture of floats and doubles
3227 // check if the optimizer has made it homogenous, item (3).
3228 if( Use24BitFPMode && Use24BitFP && UseSSE == 0 &&
3229 frc.get_float_count() > 32 &&
3230 frc.get_double_count() == 0 &&
3231 (10 * frc.get_call_count() < frc.get_float_count()) ) {
3232 set_24_bit_selection_and_mode( false, true );
3233 }
3234
3235 set_java_calls(frc.get_java_call_count());
3236 set_inner_loops(frc.get_inner_loop_count());
3237
3238 // No infinite loops, no reason to bail out.
3239 return false;
3240 }
3241
3242 //-----------------------------too_many_traps----------------------------------
3243 // Report if there are too many traps at the current method and bci.
3244 // Return true if there was a trap, and/or PerMethodTrapLimit is exceeded.
3245 bool Compile::too_many_traps(ciMethod* method,
3246 int bci,
3247 Deoptimization::DeoptReason reason) {
3248 ciMethodData* md = method->method_data();
3249 if (md->is_empty()) {
3250 // Assume the trap has not occurred, or that it occurred only
3251 // because of a transient condition during start-up in the interpreter.
3252 return false;
3253 }
3254 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? this->method() : NULL;
3255 if (md->has_trap_at(bci, m, reason) != 0) {
3256 // Assume PerBytecodeTrapLimit==0, for a more conservative heuristic.
3257 // Also, if there are multiple reasons, or if there is no per-BCI record,
3258 // assume the worst.
3259 if (log())
3260 log()->elem("observe trap='%s' count='%d'",
3261 Deoptimization::trap_reason_name(reason),
3262 md->trap_count(reason));
3263 return true;
3264 } else {
3265 // Ignore method/bci and see if there have been too many globally.
3266 return too_many_traps(reason, md);
3267 }
3268 }
3269
3270 // Less-accurate variant which does not require a method and bci.
3271 bool Compile::too_many_traps(Deoptimization::DeoptReason reason,
3272 ciMethodData* logmd) {
3273 if (trap_count(reason) >= Deoptimization::per_method_trap_limit(reason)) {
3274 // Too many traps globally.
3275 // Note that we use cumulative trap_count, not just md->trap_count.
3276 if (log()) {
3277 int mcount = (logmd == NULL)? -1: (int)logmd->trap_count(reason);
3278 log()->elem("observe trap='%s' count='0' mcount='%d' ccount='%d'",
3279 Deoptimization::trap_reason_name(reason),
3280 mcount, trap_count(reason));
3281 }
3282 return true;
3283 } else {
3284 // The coast is clear.
3285 return false;
3286 }
3287 }
3288
3289 //--------------------------too_many_recompiles--------------------------------
3290 // Report if there are too many recompiles at the current method and bci.
3291 // Consults PerBytecodeRecompilationCutoff and PerMethodRecompilationCutoff.
3292 // Is not eager to return true, since this will cause the compiler to use
3293 // Action_none for a trap point, to avoid too many recompilations.
3294 bool Compile::too_many_recompiles(ciMethod* method,
3295 int bci,
3296 Deoptimization::DeoptReason reason) {
3297 ciMethodData* md = method->method_data();
3298 if (md->is_empty()) {
3299 // Assume the trap has not occurred, or that it occurred only
3300 // because of a transient condition during start-up in the interpreter.
3301 return false;
3302 }
3303 // Pick a cutoff point well within PerBytecodeRecompilationCutoff.
3304 uint bc_cutoff = (uint) PerBytecodeRecompilationCutoff / 8;
3305 uint m_cutoff = (uint) PerMethodRecompilationCutoff / 2 + 1; // not zero
3306 Deoptimization::DeoptReason per_bc_reason
3307 = Deoptimization::reason_recorded_per_bytecode_if_any(reason);
3308 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? this->method() : NULL;
3309 if ((per_bc_reason == Deoptimization::Reason_none
3310 || md->has_trap_at(bci, m, reason) != 0)
3311 // The trap frequency measure we care about is the recompile count:
3312 && md->trap_recompiled_at(bci, m)
3313 && md->overflow_recompile_count() >= bc_cutoff) {
3314 // Do not emit a trap here if it has already caused recompilations.
3315 // Also, if there are multiple reasons, or if there is no per-BCI record,
3316 // assume the worst.
3317 if (log())
3318 log()->elem("observe trap='%s recompiled' count='%d' recompiles2='%d'",
3319 Deoptimization::trap_reason_name(reason),
3320 md->trap_count(reason),
3321 md->overflow_recompile_count());
3322 return true;
3323 } else if (trap_count(reason) != 0
3324 && decompile_count() >= m_cutoff) {
3325 // Too many recompiles globally, and we have seen this sort of trap.
3326 // Use cumulative decompile_count, not just md->decompile_count.
3327 if (log())
3328 log()->elem("observe trap='%s' count='%d' mcount='%d' decompiles='%d' mdecompiles='%d'",
3329 Deoptimization::trap_reason_name(reason),
3330 md->trap_count(reason), trap_count(reason),
3331 md->decompile_count(), decompile_count());
3332 return true;
3333 } else {
3334 // The coast is clear.
3335 return false;
3336 }
3337 }
3338
3339 // Compute when not to trap. Used by matching trap based nodes and
3340 // NullCheck optimization.
3341 void Compile::set_allowed_deopt_reasons() {
3342 _allowed_reasons = 0;
3343 if (is_method_compilation()) {
3344 for (int rs = (int)Deoptimization::Reason_none+1; rs < Compile::trapHistLength; rs++) {
3345 assert(rs < BitsPerInt, "recode bit map");
3346 if (!too_many_traps((Deoptimization::DeoptReason) rs)) {
3347 _allowed_reasons |= nth_bit(rs);
3348 }
3349 }
3350 }
3351 }
3352
3353 #ifndef PRODUCT
3354 //------------------------------verify_graph_edges---------------------------
3355 // Walk the Graph and verify that there is a one-to-one correspondence
3356 // between Use-Def edges and Def-Use edges in the graph.
3357 void Compile::verify_graph_edges(bool no_dead_code) {
3358 if (VerifyGraphEdges) {
3359 ResourceArea *area = Thread::current()->resource_area();
3360 Unique_Node_List visited(area);
3361 // Call recursive graph walk to check edges
3362 _root->verify_edges(visited);
3363 if (no_dead_code) {
3364 // Now make sure that no visited node is used by an unvisited node.
3365 bool dead_nodes = 0;
3366 Unique_Node_List checked(area);
3367 while (visited.size() > 0) {
3368 Node* n = visited.pop();
3369 checked.push(n);
3370 for (uint i = 0; i < n->outcnt(); i++) {
3371 Node* use = n->raw_out(i);
3372 if (checked.member(use)) continue; // already checked
3373 if (visited.member(use)) continue; // already in the graph
3374 if (use->is_Con()) continue; // a dead ConNode is OK
3375 // At this point, we have found a dead node which is DU-reachable.
3376 if (dead_nodes++ == 0)
3377 tty->print_cr("*** Dead nodes reachable via DU edges:");
3378 use->dump(2);
3379 tty->print_cr("---");
3380 checked.push(use); // No repeats; pretend it is now checked.
3381 }
3382 }
3383 assert(dead_nodes == 0, "using nodes must be reachable from root");
3384 }
3385 }
3386 }
3387
3388 // Verify GC barriers consistency
3389 // Currently supported:
3390 // - G1 pre-barriers (see GraphKit::g1_write_barrier_pre())
3391 void Compile::verify_barriers() {
3392 if (UseG1GC) {
3393 // Verify G1 pre-barriers
3394 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + PtrQueue::byte_offset_of_active());
3395
3396 ResourceArea *area = Thread::current()->resource_area();
3397 Unique_Node_List visited(area);
3398 Node_List worklist(area);
3399 // We're going to walk control flow backwards starting from the Root
3400 worklist.push(_root);
3401 while (worklist.size() > 0) {
3402 Node* x = worklist.pop();
3403 if (x == NULL || x == top()) continue;
3404 if (visited.member(x)) {
3405 continue;
3406 } else {
3407 visited.push(x);
3408 }
3409
3410 if (x->is_Region()) {
3411 for (uint i = 1; i < x->req(); i++) {
3412 worklist.push(x->in(i));
3413 }
3414 } else {
3415 worklist.push(x->in(0));
3416 // We are looking for the pattern:
3417 // /->ThreadLocal
3418 // If->Bool->CmpI->LoadB->AddP->ConL(marking_offset)
3419 // \->ConI(0)
3420 // We want to verify that the If and the LoadB have the same control
3421 // See GraphKit::g1_write_barrier_pre()
3422 if (x->is_If()) {
3423 IfNode *iff = x->as_If();
3424 if (iff->in(1)->is_Bool() && iff->in(1)->in(1)->is_Cmp()) {
3425 CmpNode *cmp = iff->in(1)->in(1)->as_Cmp();
3426 if (cmp->Opcode() == Op_CmpI && cmp->in(2)->is_Con() && cmp->in(2)->bottom_type()->is_int()->get_con() == 0
3427 && cmp->in(1)->is_Load()) {
3428 LoadNode* load = cmp->in(1)->as_Load();
3429 if (load->Opcode() == Op_LoadB && load->in(2)->is_AddP() && load->in(2)->in(2)->Opcode() == Op_ThreadLocal
3430 && load->in(2)->in(3)->is_Con()
3431 && load->in(2)->in(3)->bottom_type()->is_intptr_t()->get_con() == marking_offset) {
3432
3433 Node* if_ctrl = iff->in(0);
3434 Node* load_ctrl = load->in(0);
3435
3436 if (if_ctrl != load_ctrl) {
3437 // Skip possible CProj->NeverBranch in infinite loops
3438 if ((if_ctrl->is_Proj() && if_ctrl->Opcode() == Op_CProj)
3439 && (if_ctrl->in(0)->is_MultiBranch() && if_ctrl->in(0)->Opcode() == Op_NeverBranch)) {
3440 if_ctrl = if_ctrl->in(0)->in(0);
3441 }
3442 }
3443 assert(load_ctrl != NULL && if_ctrl == load_ctrl, "controls must match");
3444 }
3445 }
3446 }
3447 }
3448 }
3449 }
3450 }
3451 }
3452
3453 #endif
3454
3455 // The Compile object keeps track of failure reasons separately from the ciEnv.
3456 // This is required because there is not quite a 1-1 relation between the
3457 // ciEnv and its compilation task and the Compile object. Note that one
3458 // ciEnv might use two Compile objects, if C2Compiler::compile_method decides
3459 // to backtrack and retry without subsuming loads. Other than this backtracking
3460 // behavior, the Compile's failure reason is quietly copied up to the ciEnv
3461 // by the logic in C2Compiler.
3462 void Compile::record_failure(const char* reason) {
3463 if (log() != NULL) {
3464 log()->elem("failure reason='%s' phase='compile'", reason);
3465 }
3466 if (_failure_reason == NULL) {
3467 // Record the first failure reason.
3468 _failure_reason = reason;
3469 }
3470
3471 EventCompilerFailure event;
3472 if (event.should_commit()) {
3473 event.set_compileID(Compile::compile_id());
3474 event.set_failure(reason);
3475 event.commit();
3476 }
3477
3478 if (!C->failure_reason_is(C2Compiler::retry_no_subsuming_loads())) {
3479 C->print_method(PHASE_FAILURE);
3480 }
3481 _root = NULL; // flush the graph, too
3482 }
3483
3484 Compile::TracePhase::TracePhase(const char* name, elapsedTimer* accumulator, bool dolog)
3485 : TraceTime(NULL, accumulator, false NOT_PRODUCT( || TimeCompiler ), false),
3486 _phase_name(name), _dolog(dolog)
3487 {
3488 if (dolog) {
3489 C = Compile::current();
3490 _log = C->log();
3491 } else {
3492 C = NULL;
3493 _log = NULL;
3494 }
3495 if (_log != NULL) {
3496 _log->begin_head("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes());
3497 _log->stamp();
3498 _log->end_head();
3499 }
3500 }
3501
3502 Compile::TracePhase::~TracePhase() {
3503
3504 C = Compile::current();
3505 if (_dolog) {
3506 _log = C->log();
3507 } else {
3508 _log = NULL;
3509 }
3510
3511 #ifdef ASSERT
3512 if (PrintIdealNodeCount) {
3513 tty->print_cr("phase name='%s' nodes='%d' live='%d' live_graph_walk='%d'",
3514 _phase_name, C->unique(), C->live_nodes(), C->count_live_nodes_by_graph_walk());
3515 }
3516
3517 if (VerifyIdealNodeCount) {
3518 Compile::current()->print_missing_nodes();
3519 }
3520 #endif
3521
3522 if (_log != NULL) {
3523 _log->done("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes());
3524 }
3525 }
3526
3527 //=============================================================================
3528 // Two Constant's are equal when the type and the value are equal.
3529 bool Compile::Constant::operator==(const Constant& other) {
3530 if (type() != other.type() ) return false;
3531 if (can_be_reused() != other.can_be_reused()) return false;
3532 // For floating point values we compare the bit pattern.
3533 switch (type()) {
3534 case T_FLOAT: return (_v._value.i == other._v._value.i);
3535 case T_LONG:
3536 case T_DOUBLE: return (_v._value.j == other._v._value.j);
3537 case T_OBJECT:
3538 case T_ADDRESS: return (_v._value.l == other._v._value.l);
3539 case T_VOID: return (_v._value.l == other._v._value.l); // jump-table entries
3540 case T_METADATA: return (_v._metadata == other._v._metadata);
3541 default: ShouldNotReachHere();
3542 }
3543 return false;
3544 }
3545
3546 static int type_to_size_in_bytes(BasicType t) {
3547 switch (t) {
3548 case T_LONG: return sizeof(jlong );
3549 case T_FLOAT: return sizeof(jfloat );
3550 case T_DOUBLE: return sizeof(jdouble);
3551 case T_METADATA: return sizeof(Metadata*);
3552 // We use T_VOID as marker for jump-table entries (labels) which
3553 // need an internal word relocation.
3554 case T_VOID:
3555 case T_ADDRESS:
3556 case T_OBJECT: return sizeof(jobject);
3557 }
3558
3559 ShouldNotReachHere();
3560 return -1;
3561 }
3562
3563 int Compile::ConstantTable::qsort_comparator(Constant* a, Constant* b) {
3564 // sort descending
3565 if (a->freq() > b->freq()) return -1;
3566 if (a->freq() < b->freq()) return 1;
3567 return 0;
3568 }
3569
3570 void Compile::ConstantTable::calculate_offsets_and_size() {
3571 // First, sort the array by frequencies.
3572 _constants.sort(qsort_comparator);
3573
3574 #ifdef ASSERT
3575 // Make sure all jump-table entries were sorted to the end of the
3576 // array (they have a negative frequency).
3577 bool found_void = false;
3578 for (int i = 0; i < _constants.length(); i++) {
3579 Constant con = _constants.at(i);
3580 if (con.type() == T_VOID)
3581 found_void = true; // jump-tables
3582 else
3583 assert(!found_void, "wrong sorting");
3584 }
3585 #endif
3586
3587 int offset = 0;
3588 for (int i = 0; i < _constants.length(); i++) {
3589 Constant* con = _constants.adr_at(i);
3590
3591 // Align offset for type.
3592 int typesize = type_to_size_in_bytes(con->type());
3593 offset = align_size_up(offset, typesize);
3594 con->set_offset(offset); // set constant's offset
3595
3596 if (con->type() == T_VOID) {
3597 MachConstantNode* n = (MachConstantNode*) con->get_jobject();
3598 offset = offset + typesize * n->outcnt(); // expand jump-table
3599 } else {
3600 offset = offset + typesize;
3601 }
3602 }
3603
3604 // Align size up to the next section start (which is insts; see
3605 // CodeBuffer::align_at_start).
3606 assert(_size == -1, "already set?");
3607 _size = align_size_up(offset, CodeEntryAlignment);
3608 }
3609
3610 void Compile::ConstantTable::emit(CodeBuffer& cb) {
3611 MacroAssembler _masm(&cb);
3612 for (int i = 0; i < _constants.length(); i++) {
3613 Constant con = _constants.at(i);
3614 address constant_addr;
3615 switch (con.type()) {
3616 case T_LONG: constant_addr = _masm.long_constant( con.get_jlong() ); break;
3617 case T_FLOAT: constant_addr = _masm.float_constant( con.get_jfloat() ); break;
3618 case T_DOUBLE: constant_addr = _masm.double_constant(con.get_jdouble()); break;
3619 case T_OBJECT: {
3620 jobject obj = con.get_jobject();
3621 int oop_index = _masm.oop_recorder()->find_index(obj);
3622 constant_addr = _masm.address_constant((address) obj, oop_Relocation::spec(oop_index));
3623 break;
3624 }
3625 case T_ADDRESS: {
3626 address addr = (address) con.get_jobject();
3627 constant_addr = _masm.address_constant(addr);
3628 break;
3629 }
3630 // We use T_VOID as marker for jump-table entries (labels) which
3631 // need an internal word relocation.
3632 case T_VOID: {
3633 MachConstantNode* n = (MachConstantNode*) con.get_jobject();
3634 // Fill the jump-table with a dummy word. The real value is
3635 // filled in later in fill_jump_table.
3636 address dummy = (address) n;
3637 constant_addr = _masm.address_constant(dummy);
3638 // Expand jump-table
3639 for (uint i = 1; i < n->outcnt(); i++) {
3640 address temp_addr = _masm.address_constant(dummy + i);
3641 assert(temp_addr, "consts section too small");
3642 }
3643 break;
3644 }
3645 case T_METADATA: {
3646 Metadata* obj = con.get_metadata();
3647 int metadata_index = _masm.oop_recorder()->find_index(obj);
3648 constant_addr = _masm.address_constant((address) obj, metadata_Relocation::spec(metadata_index));
3649 break;
3650 }
3651 default: ShouldNotReachHere();
3652 }
3653 assert(constant_addr, "consts section too small");
3654 assert((constant_addr - _masm.code()->consts()->start()) == con.offset(), err_msg_res("must be: %d == %d", constant_addr - _masm.code()->consts()->start(), con.offset()));
3655 }
3656 }
3657
3658 int Compile::ConstantTable::find_offset(Constant& con) const {
3659 int idx = _constants.find(con);
3660 assert(idx != -1, "constant must be in constant table");
3661 int offset = _constants.at(idx).offset();
3662 assert(offset != -1, "constant table not emitted yet?");
3663 return offset;
3664 }
3665
3666 void Compile::ConstantTable::add(Constant& con) {
3667 if (con.can_be_reused()) {
3668 int idx = _constants.find(con);
3669 if (idx != -1 && _constants.at(idx).can_be_reused()) {
3670 _constants.adr_at(idx)->inc_freq(con.freq()); // increase the frequency by the current value
3671 return;
3672 }
3673 }
3674 (void) _constants.append(con);
3675 }
3676
3677 Compile::Constant Compile::ConstantTable::add(MachConstantNode* n, BasicType type, jvalue value) {
3678 Block* b = Compile::current()->cfg()->get_block_for_node(n);
3679 Constant con(type, value, b->_freq);
3680 add(con);
3681 return con;
3682 }
3683
3684 Compile::Constant Compile::ConstantTable::add(Metadata* metadata) {
3685 Constant con(metadata);
3686 add(con);
3687 return con;
3688 }
3689
3690 Compile::Constant Compile::ConstantTable::add(MachConstantNode* n, MachOper* oper) {
3691 jvalue value;
3692 BasicType type = oper->type()->basic_type();
3693 switch (type) {
3694 case T_LONG: value.j = oper->constantL(); break;
3695 case T_FLOAT: value.f = oper->constantF(); break;
3696 case T_DOUBLE: value.d = oper->constantD(); break;
3697 case T_OBJECT:
3698 case T_ADDRESS: value.l = (jobject) oper->constant(); break;
3699 case T_METADATA: return add((Metadata*)oper->constant()); break;
3700 default: guarantee(false, err_msg_res("unhandled type: %s", type2name(type)));
3701 }
3702 return add(n, type, value);
3703 }
3704
3705 Compile::Constant Compile::ConstantTable::add_jump_table(MachConstantNode* n) {
3706 jvalue value;
3707 // We can use the node pointer here to identify the right jump-table
3708 // as this method is called from Compile::Fill_buffer right before
3709 // the MachNodes are emitted and the jump-table is filled (means the
3710 // MachNode pointers do not change anymore).
3711 value.l = (jobject) n;
3712 Constant con(T_VOID, value, next_jump_table_freq(), false); // Labels of a jump-table cannot be reused.
3713 add(con);
3714 return con;
3715 }
3716
3717 void Compile::ConstantTable::fill_jump_table(CodeBuffer& cb, MachConstantNode* n, GrowableArray<Label*> labels) const {
3718 // If called from Compile::scratch_emit_size do nothing.
3719 if (Compile::current()->in_scratch_emit_size()) return;
3720
3721 assert(labels.is_nonempty(), "must be");
3722 assert((uint) labels.length() == n->outcnt(), err_msg_res("must be equal: %d == %d", labels.length(), n->outcnt()));
3723
3724 // Since MachConstantNode::constant_offset() also contains
3725 // table_base_offset() we need to subtract the table_base_offset()
3726 // to get the plain offset into the constant table.
3727 int offset = n->constant_offset() - table_base_offset();
3728
3729 MacroAssembler _masm(&cb);
3730 address* jump_table_base = (address*) (_masm.code()->consts()->start() + offset);
3731
3732 for (uint i = 0; i < n->outcnt(); i++) {
3733 address* constant_addr = &jump_table_base[i];
3734 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)));
3735 *constant_addr = cb.consts()->target(*labels.at(i), (address) constant_addr);
3736 cb.consts()->relocate((address) constant_addr, relocInfo::internal_word_type);
3737 }
3738 }
3739
3740 // The message about the current inlining is accumulated in
3741 // _print_inlining_stream and transfered into the _print_inlining_list
3742 // once we know whether inlining succeeds or not. For regular
3743 // inlining, messages are appended to the buffer pointed by
3744 // _print_inlining_idx in the _print_inlining_list. For late inlining,
3745 // a new buffer is added after _print_inlining_idx in the list. This
3746 // way we can update the inlining message for late inlining call site
3747 // when the inlining is attempted again.
3748 void Compile::print_inlining_init() {
3749 if (print_inlining() || print_intrinsics()) {
3750 _print_inlining_stream = new stringStream();
3751 _print_inlining_list = new (comp_arena())GrowableArray<PrintInliningBuffer>(comp_arena(), 1, 1, PrintInliningBuffer());
3752 }
3753 }
3754
3755 void Compile::print_inlining_reinit() {
3756 if (print_inlining() || print_intrinsics()) {
3757 // Re allocate buffer when we change ResourceMark
3758 _print_inlining_stream = new stringStream();
3759 }
3760 }
3761
3762 void Compile::print_inlining_reset() {
3763 _print_inlining_stream->reset();
3764 }
3765
3766 void Compile::print_inlining_commit() {
3767 assert(print_inlining() || print_intrinsics(), "PrintInlining off?");
3768 // Transfer the message from _print_inlining_stream to the current
3769 // _print_inlining_list buffer and clear _print_inlining_stream.
3770 _print_inlining_list->at(_print_inlining_idx).ss()->write(_print_inlining_stream->as_string(), _print_inlining_stream->size());
3771 print_inlining_reset();
3772 }
3773
3774 void Compile::print_inlining_push() {
3775 // Add new buffer to the _print_inlining_list at current position
3776 _print_inlining_idx++;
3777 _print_inlining_list->insert_before(_print_inlining_idx, PrintInliningBuffer());
3778 }
3779
3780 Compile::PrintInliningBuffer& Compile::print_inlining_current() {
3781 return _print_inlining_list->at(_print_inlining_idx);
3782 }
3783
3784 void Compile::print_inlining_update(CallGenerator* cg) {
3785 if (print_inlining() || print_intrinsics()) {
3786 if (!cg->is_late_inline()) {
3787 if (print_inlining_current().cg() != NULL) {
3788 print_inlining_push();
3789 }
3790 print_inlining_commit();
3791 } else {
3792 if (print_inlining_current().cg() != cg &&
3793 (print_inlining_current().cg() != NULL ||
3794 print_inlining_current().ss()->size() != 0)) {
3795 print_inlining_push();
3796 }
3797 print_inlining_commit();
3798 print_inlining_current().set_cg(cg);
3799 }
3800 }
3801 }
3802
3803 void Compile::print_inlining_move_to(CallGenerator* cg) {
3804 // We resume inlining at a late inlining call site. Locate the
3805 // corresponding inlining buffer so that we can update it.
3806 if (print_inlining()) {
3807 for (int i = 0; i < _print_inlining_list->length(); i++) {
3808 if (_print_inlining_list->adr_at(i)->cg() == cg) {
3809 _print_inlining_idx = i;
3810 return;
3811 }
3812 }
3813 ShouldNotReachHere();
3814 }
3815 }
3816
3817 void Compile::print_inlining_update_delayed(CallGenerator* cg) {
3818 if (print_inlining()) {
3819 assert(_print_inlining_stream->size() > 0, "missing inlining msg");
3820 assert(print_inlining_current().cg() == cg, "wrong entry");
3821 // replace message with new message
3822 _print_inlining_list->at_put(_print_inlining_idx, PrintInliningBuffer());
3823 print_inlining_commit();
3824 print_inlining_current().set_cg(cg);
3825 }
3826 }
3827
3828 void Compile::print_inlining_assert_ready() {
3829 assert(!_print_inlining || _print_inlining_stream->size() == 0, "loosing data");
3830 }
3831
3832 void Compile::dump_inlining() {
3833 bool do_print_inlining = print_inlining() || print_intrinsics();
3834 if (do_print_inlining) {
3835 // Print inlining message for candidates that we couldn't inline
3836 // for lack of space
3837 for (int i = 0; i < _late_inlines.length(); i++) {
3838 CallGenerator* cg = _late_inlines.at(i);
3839 if (!cg->is_mh_late_inline()) {
3840 const char* msg = "live nodes > LiveNodeCountInliningCutoff";
3841 if (do_print_inlining) {
3842 cg->print_inlining_late(msg);
3843 }
3844 }
3845 }
3846 }
3847 if (do_print_inlining) {
3848 for (int i = 0; i < _print_inlining_list->length(); i++) {
3849 tty->print(_print_inlining_list->adr_at(i)->ss()->as_string());
3850 }
3851 }
3852 }
3853
3854 // Dump inlining replay data to the stream.
3855 // Don't change thread state and acquire any locks.
3856 void Compile::dump_inline_data(outputStream* out) {
3857 InlineTree* inl_tree = ilt();
3858 if (inl_tree != NULL) {
3859 out->print(" inline %d", inl_tree->count());
3860 inl_tree->dump_replay_data(out);
3861 }
3862 }
3863
3864 int Compile::cmp_expensive_nodes(Node* n1, Node* n2) {
3865 if (n1->Opcode() < n2->Opcode()) return -1;
3866 else if (n1->Opcode() > n2->Opcode()) return 1;
3867
3868 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()));
3869 for (uint i = 1; i < n1->req(); i++) {
3870 if (n1->in(i) < n2->in(i)) return -1;
3871 else if (n1->in(i) > n2->in(i)) return 1;
3872 }
3873
3874 return 0;
3875 }
3876
3877 int Compile::cmp_expensive_nodes(Node** n1p, Node** n2p) {
3878 Node* n1 = *n1p;
3879 Node* n2 = *n2p;
3880
3881 return cmp_expensive_nodes(n1, n2);
3882 }
3883
3884 void Compile::sort_expensive_nodes() {
3885 if (!expensive_nodes_sorted()) {
3886 _expensive_nodes->sort(cmp_expensive_nodes);
3887 }
3888 }
3889
3890 bool Compile::expensive_nodes_sorted() const {
3891 for (int i = 1; i < _expensive_nodes->length(); i++) {
3892 if (cmp_expensive_nodes(_expensive_nodes->adr_at(i), _expensive_nodes->adr_at(i-1)) < 0) {
3893 return false;
3894 }
3895 }
3896 return true;
3897 }
3898
3899 bool Compile::should_optimize_expensive_nodes(PhaseIterGVN &igvn) {
3900 if (_expensive_nodes->length() == 0) {
3901 return false;
3902 }
3903
3904 assert(OptimizeExpensiveOps, "optimization off?");
3905
3906 // Take this opportunity to remove dead nodes from the list
3907 int j = 0;
3908 for (int i = 0; i < _expensive_nodes->length(); i++) {
3909 Node* n = _expensive_nodes->at(i);
3910 if (!n->is_unreachable(igvn)) {
3911 assert(n->is_expensive(), "should be expensive");
3912 _expensive_nodes->at_put(j, n);
3913 j++;
3914 }
3915 }
3916 _expensive_nodes->trunc_to(j);
3917
3918 // Then sort the list so that similar nodes are next to each other
3919 // and check for at least two nodes of identical kind with same data
3920 // inputs.
3921 sort_expensive_nodes();
3922
3923 for (int i = 0; i < _expensive_nodes->length()-1; i++) {
3924 if (cmp_expensive_nodes(_expensive_nodes->adr_at(i), _expensive_nodes->adr_at(i+1)) == 0) {
3925 return true;
3926 }
3927 }
3928
3929 return false;
3930 }
3931
3932 void Compile::cleanup_expensive_nodes(PhaseIterGVN &igvn) {
3933 if (_expensive_nodes->length() == 0) {
3934 return;
3935 }
3936
3937 assert(OptimizeExpensiveOps, "optimization off?");
3938
3939 // Sort to bring similar nodes next to each other and clear the
3940 // control input of nodes for which there's only a single copy.
3941 sort_expensive_nodes();
3942
3943 int j = 0;
3944 int identical = 0;
3945 int i = 0;
3946 for (; i < _expensive_nodes->length()-1; i++) {
3947 assert(j <= i, "can't write beyond current index");
3948 if (_expensive_nodes->at(i)->Opcode() == _expensive_nodes->at(i+1)->Opcode()) {
3949 identical++;
3950 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
3951 continue;
3952 }
3953 if (identical > 0) {
3954 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
3955 identical = 0;
3956 } else {
3957 Node* n = _expensive_nodes->at(i);
3958 igvn.hash_delete(n);
3959 n->set_req(0, NULL);
3960 igvn.hash_insert(n);
3961 }
3962 }
3963 if (identical > 0) {
3964 _expensive_nodes->at_put(j++, _expensive_nodes->at(i));
3965 } else if (_expensive_nodes->length() >= 1) {
3966 Node* n = _expensive_nodes->at(i);
3967 igvn.hash_delete(n);
3968 n->set_req(0, NULL);
3969 igvn.hash_insert(n);
3970 }
3971 _expensive_nodes->trunc_to(j);
3972 }
3973
3974 void Compile::add_expensive_node(Node * n) {
3975 assert(!_expensive_nodes->contains(n), "duplicate entry in expensive list");
3976 assert(n->is_expensive(), "expensive nodes with non-null control here only");
3977 assert(!n->is_CFG() && !n->is_Mem(), "no cfg or memory nodes here");
3978 if (OptimizeExpensiveOps) {
3979 _expensive_nodes->append(n);
3980 } else {
3981 // Clear control input and let IGVN optimize expensive nodes if
3982 // OptimizeExpensiveOps is off.
3983 n->set_req(0, NULL);
3984 }
3985 }
3986
3987 /**
3988 * Remove the speculative part of types and clean up the graph
3989 */
3990 void Compile::remove_speculative_types(PhaseIterGVN &igvn) {
3991 if (UseTypeSpeculation) {
3992 Unique_Node_List worklist;
3993 worklist.push(root());
3994 int modified = 0;
3995 // Go over all type nodes that carry a speculative type, drop the
3996 // speculative part of the type and enqueue the node for an igvn
3997 // which may optimize it out.
3998 for (uint next = 0; next < worklist.size(); ++next) {
3999 Node *n = worklist.at(next);
4000 if (n->is_Type()) {
4001 TypeNode* tn = n->as_Type();
4002 const Type* t = tn->type();
4003 const Type* t_no_spec = t->remove_speculative();
4004 if (t_no_spec != t) {
4005 bool in_hash = igvn.hash_delete(n);
4006 assert(in_hash, "node should be in igvn hash table");
4007 tn->set_type(t_no_spec);
4008 igvn.hash_insert(n);
4009 igvn._worklist.push(n); // give it a chance to go away
4010 modified++;
4011 }
4012 }
4013 uint max = n->len();
4014 for( uint i = 0; i < max; ++i ) {
4015 Node *m = n->in(i);
4016 if (not_a_node(m)) continue;
4017 worklist.push(m);
4018 }
4019 }
4020 // Drop the speculative part of all types in the igvn's type table
4021 igvn.remove_speculative_types();
4022 if (modified > 0) {
4023 igvn.optimize();
4024 }
4025 #ifdef ASSERT
4026 // Verify that after the IGVN is over no speculative type has resurfaced
4027 worklist.clear();
4028 worklist.push(root());
4029 for (uint next = 0; next < worklist.size(); ++next) {
4030 Node *n = worklist.at(next);
4031 const Type* t = igvn.type(n);
4032 assert(t == t->remove_speculative(), "no more speculative types");
4033 if (n->is_Type()) {
4034 t = n->as_Type()->type();
4035 assert(t == t->remove_speculative(), "no more speculative types");
4036 }
4037 uint max = n->len();
4038 for( uint i = 0; i < max; ++i ) {
4039 Node *m = n->in(i);
4040 if (not_a_node(m)) continue;
4041 worklist.push(m);
4042 }
4043 }
4044 igvn.check_no_speculative_types();
4045 #endif
4046 }
4047 }
4048
4049 // Auxiliary method to support randomized stressing/fuzzing.
4050 //
4051 // This method can be called the arbitrary number of times, with current count
4052 // as the argument. The logic allows selecting a single candidate from the
4053 // running list of candidates as follows:
4054 // int count = 0;
4055 // Cand* selected = null;
4056 // while(cand = cand->next()) {
4057 // if (randomized_select(++count)) {
4058 // selected = cand;
4059 // }
4060 // }
4061 //
4062 // Including count equalizes the chances any candidate is "selected".
4063 // This is useful when we don't have the complete list of candidates to choose
4064 // from uniformly. In this case, we need to adjust the randomicity of the
4065 // selection, or else we will end up biasing the selection towards the latter
4066 // candidates.
4067 //
4068 // Quick back-envelope calculation shows that for the list of n candidates
4069 // the equal probability for the candidate to persist as "best" can be
4070 // achieved by replacing it with "next" k-th candidate with the probability
4071 // of 1/k. It can be easily shown that by the end of the run, the
4072 // probability for any candidate is converged to 1/n, thus giving the
4073 // uniform distribution among all the candidates.
4074 //
4075 // We don't care about the domain size as long as (RANDOMIZED_DOMAIN / count) is large.
4076 #define RANDOMIZED_DOMAIN_POW 29
4077 #define RANDOMIZED_DOMAIN (1 << RANDOMIZED_DOMAIN_POW)
4078 #define RANDOMIZED_DOMAIN_MASK ((1 << (RANDOMIZED_DOMAIN_POW + 1)) - 1)
4079 bool Compile::randomized_select(int count) {
4080 assert(count > 0, "only positive");
4081 return (os::random() & RANDOMIZED_DOMAIN_MASK) < (RANDOMIZED_DOMAIN / count);
4082 }