Mercurial > hg > graal-compiler
annotate src/share/vm/opto/compile.cpp @ 1039:987e948ebbc8
6815692: method handle code needs some cleanup (post-6655638)
Summary: correctly raise exceptions, support safe bitwise "raw" conversions, fix bugs revealed by VerifyMethodHandles, remove dead code, improve debugging support
Reviewed-by: never, twisti
author | jrose |
---|---|
date | Sat, 17 Oct 2009 19:51:05 -0700 |
parents | cd18bd5e667c |
children | 7c57aead6d3e |
rev | line source |
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0 | 1 /* |
624 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_compile.cpp.incl" | |
27 | |
28 /// Support for intrinsics. | |
29 | |
30 // Return the index at which m must be inserted (or already exists). | |
31 // The sort order is by the address of the ciMethod, with is_virtual as minor key. | |
32 int Compile::intrinsic_insertion_index(ciMethod* m, bool is_virtual) { | |
33 #ifdef ASSERT | |
34 for (int i = 1; i < _intrinsics->length(); i++) { | |
35 CallGenerator* cg1 = _intrinsics->at(i-1); | |
36 CallGenerator* cg2 = _intrinsics->at(i); | |
37 assert(cg1->method() != cg2->method() | |
38 ? cg1->method() < cg2->method() | |
39 : cg1->is_virtual() < cg2->is_virtual(), | |
40 "compiler intrinsics list must stay sorted"); | |
41 } | |
42 #endif | |
43 // Binary search sorted list, in decreasing intervals [lo, hi]. | |
44 int lo = 0, hi = _intrinsics->length()-1; | |
45 while (lo <= hi) { | |
46 int mid = (uint)(hi + lo) / 2; | |
47 ciMethod* mid_m = _intrinsics->at(mid)->method(); | |
48 if (m < mid_m) { | |
49 hi = mid-1; | |
50 } else if (m > mid_m) { | |
51 lo = mid+1; | |
52 } else { | |
53 // look at minor sort key | |
54 bool mid_virt = _intrinsics->at(mid)->is_virtual(); | |
55 if (is_virtual < mid_virt) { | |
56 hi = mid-1; | |
57 } else if (is_virtual > mid_virt) { | |
58 lo = mid+1; | |
59 } else { | |
60 return mid; // exact match | |
61 } | |
62 } | |
63 } | |
64 return lo; // inexact match | |
65 } | |
66 | |
67 void Compile::register_intrinsic(CallGenerator* cg) { | |
68 if (_intrinsics == NULL) { | |
69 _intrinsics = new GrowableArray<CallGenerator*>(60); | |
70 } | |
71 // This code is stolen from ciObjectFactory::insert. | |
72 // Really, GrowableArray should have methods for | |
73 // insert_at, remove_at, and binary_search. | |
74 int len = _intrinsics->length(); | |
75 int index = intrinsic_insertion_index(cg->method(), cg->is_virtual()); | |
76 if (index == len) { | |
77 _intrinsics->append(cg); | |
78 } else { | |
79 #ifdef ASSERT | |
80 CallGenerator* oldcg = _intrinsics->at(index); | |
81 assert(oldcg->method() != cg->method() || oldcg->is_virtual() != cg->is_virtual(), "don't register twice"); | |
82 #endif | |
83 _intrinsics->append(_intrinsics->at(len-1)); | |
84 int pos; | |
85 for (pos = len-2; pos >= index; pos--) { | |
86 _intrinsics->at_put(pos+1,_intrinsics->at(pos)); | |
87 } | |
88 _intrinsics->at_put(index, cg); | |
89 } | |
90 assert(find_intrinsic(cg->method(), cg->is_virtual()) == cg, "registration worked"); | |
91 } | |
92 | |
93 CallGenerator* Compile::find_intrinsic(ciMethod* m, bool is_virtual) { | |
94 assert(m->is_loaded(), "don't try this on unloaded methods"); | |
95 if (_intrinsics != NULL) { | |
96 int index = intrinsic_insertion_index(m, is_virtual); | |
97 if (index < _intrinsics->length() | |
98 && _intrinsics->at(index)->method() == m | |
99 && _intrinsics->at(index)->is_virtual() == is_virtual) { | |
100 return _intrinsics->at(index); | |
101 } | |
102 } | |
103 // Lazily create intrinsics for intrinsic IDs well-known in the runtime. | |
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104 if (m->intrinsic_id() != vmIntrinsics::_none && |
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105 m->intrinsic_id() <= vmIntrinsics::LAST_COMPILER_INLINE) { |
0 | 106 CallGenerator* cg = make_vm_intrinsic(m, is_virtual); |
107 if (cg != NULL) { | |
108 // Save it for next time: | |
109 register_intrinsic(cg); | |
110 return cg; | |
111 } else { | |
112 gather_intrinsic_statistics(m->intrinsic_id(), is_virtual, _intrinsic_disabled); | |
113 } | |
114 } | |
115 return NULL; | |
116 } | |
117 | |
118 // Compile:: register_library_intrinsics and make_vm_intrinsic are defined | |
119 // in library_call.cpp. | |
120 | |
121 | |
122 #ifndef PRODUCT | |
123 // statistics gathering... | |
124 | |
125 juint Compile::_intrinsic_hist_count[vmIntrinsics::ID_LIMIT] = {0}; | |
126 jubyte Compile::_intrinsic_hist_flags[vmIntrinsics::ID_LIMIT] = {0}; | |
127 | |
128 bool Compile::gather_intrinsic_statistics(vmIntrinsics::ID id, bool is_virtual, int flags) { | |
129 assert(id > vmIntrinsics::_none && id < vmIntrinsics::ID_LIMIT, "oob"); | |
130 int oflags = _intrinsic_hist_flags[id]; | |
131 assert(flags != 0, "what happened?"); | |
132 if (is_virtual) { | |
133 flags |= _intrinsic_virtual; | |
134 } | |
135 bool changed = (flags != oflags); | |
136 if ((flags & _intrinsic_worked) != 0) { | |
137 juint count = (_intrinsic_hist_count[id] += 1); | |
138 if (count == 1) { | |
139 changed = true; // first time | |
140 } | |
141 // increment the overall count also: | |
142 _intrinsic_hist_count[vmIntrinsics::_none] += 1; | |
143 } | |
144 if (changed) { | |
145 if (((oflags ^ flags) & _intrinsic_virtual) != 0) { | |
146 // Something changed about the intrinsic's virtuality. | |
147 if ((flags & _intrinsic_virtual) != 0) { | |
148 // This is the first use of this intrinsic as a virtual call. | |
149 if (oflags != 0) { | |
150 // We already saw it as a non-virtual, so note both cases. | |
151 flags |= _intrinsic_both; | |
152 } | |
153 } else if ((oflags & _intrinsic_both) == 0) { | |
154 // This is the first use of this intrinsic as a non-virtual | |
155 flags |= _intrinsic_both; | |
156 } | |
157 } | |
158 _intrinsic_hist_flags[id] = (jubyte) (oflags | flags); | |
159 } | |
160 // update the overall flags also: | |
161 _intrinsic_hist_flags[vmIntrinsics::_none] |= (jubyte) flags; | |
162 return changed; | |
163 } | |
164 | |
165 static char* format_flags(int flags, char* buf) { | |
166 buf[0] = 0; | |
167 if ((flags & Compile::_intrinsic_worked) != 0) strcat(buf, ",worked"); | |
168 if ((flags & Compile::_intrinsic_failed) != 0) strcat(buf, ",failed"); | |
169 if ((flags & Compile::_intrinsic_disabled) != 0) strcat(buf, ",disabled"); | |
170 if ((flags & Compile::_intrinsic_virtual) != 0) strcat(buf, ",virtual"); | |
171 if ((flags & Compile::_intrinsic_both) != 0) strcat(buf, ",nonvirtual"); | |
172 if (buf[0] == 0) strcat(buf, ","); | |
173 assert(buf[0] == ',', "must be"); | |
174 return &buf[1]; | |
175 } | |
176 | |
177 void Compile::print_intrinsic_statistics() { | |
178 char flagsbuf[100]; | |
179 ttyLocker ttyl; | |
180 if (xtty != NULL) xtty->head("statistics type='intrinsic'"); | |
181 tty->print_cr("Compiler intrinsic usage:"); | |
182 juint total = _intrinsic_hist_count[vmIntrinsics::_none]; | |
183 if (total == 0) total = 1; // avoid div0 in case of no successes | |
184 #define PRINT_STAT_LINE(name, c, f) \ | |
185 tty->print_cr(" %4d (%4.1f%%) %s (%s)", (int)(c), ((c) * 100.0) / total, name, f); | |
186 for (int index = 1 + (int)vmIntrinsics::_none; index < (int)vmIntrinsics::ID_LIMIT; index++) { | |
187 vmIntrinsics::ID id = (vmIntrinsics::ID) index; | |
188 int flags = _intrinsic_hist_flags[id]; | |
189 juint count = _intrinsic_hist_count[id]; | |
190 if ((flags | count) != 0) { | |
191 PRINT_STAT_LINE(vmIntrinsics::name_at(id), count, format_flags(flags, flagsbuf)); | |
192 } | |
193 } | |
194 PRINT_STAT_LINE("total", total, format_flags(_intrinsic_hist_flags[vmIntrinsics::_none], flagsbuf)); | |
195 if (xtty != NULL) xtty->tail("statistics"); | |
196 } | |
197 | |
198 void Compile::print_statistics() { | |
199 { ttyLocker ttyl; | |
200 if (xtty != NULL) xtty->head("statistics type='opto'"); | |
201 Parse::print_statistics(); | |
202 PhaseCCP::print_statistics(); | |
203 PhaseRegAlloc::print_statistics(); | |
204 Scheduling::print_statistics(); | |
205 PhasePeephole::print_statistics(); | |
206 PhaseIdealLoop::print_statistics(); | |
207 if (xtty != NULL) xtty->tail("statistics"); | |
208 } | |
209 if (_intrinsic_hist_flags[vmIntrinsics::_none] != 0) { | |
210 // put this under its own <statistics> element. | |
211 print_intrinsic_statistics(); | |
212 } | |
213 } | |
214 #endif //PRODUCT | |
215 | |
216 // Support for bundling info | |
217 Bundle* Compile::node_bundling(const Node *n) { | |
218 assert(valid_bundle_info(n), "oob"); | |
219 return &_node_bundling_base[n->_idx]; | |
220 } | |
221 | |
222 bool Compile::valid_bundle_info(const Node *n) { | |
223 return (_node_bundling_limit > n->_idx); | |
224 } | |
225 | |
226 | |
227 // Identify all nodes that are reachable from below, useful. | |
228 // Use breadth-first pass that records state in a Unique_Node_List, | |
229 // recursive traversal is slower. | |
230 void Compile::identify_useful_nodes(Unique_Node_List &useful) { | |
231 int estimated_worklist_size = unique(); | |
232 useful.map( estimated_worklist_size, NULL ); // preallocate space | |
233 | |
234 // Initialize worklist | |
235 if (root() != NULL) { useful.push(root()); } | |
236 // If 'top' is cached, declare it useful to preserve cached node | |
237 if( cached_top_node() ) { useful.push(cached_top_node()); } | |
238 | |
239 // Push all useful nodes onto the list, breadthfirst | |
240 for( uint next = 0; next < useful.size(); ++next ) { | |
241 assert( next < unique(), "Unique useful nodes < total nodes"); | |
242 Node *n = useful.at(next); | |
243 uint max = n->len(); | |
244 for( uint i = 0; i < max; ++i ) { | |
245 Node *m = n->in(i); | |
246 if( m == NULL ) continue; | |
247 useful.push(m); | |
248 } | |
249 } | |
250 } | |
251 | |
252 // Disconnect all useless nodes by disconnecting those at the boundary. | |
253 void Compile::remove_useless_nodes(Unique_Node_List &useful) { | |
254 uint next = 0; | |
255 while( next < useful.size() ) { | |
256 Node *n = useful.at(next++); | |
257 // Use raw traversal of out edges since this code removes out edges | |
258 int max = n->outcnt(); | |
259 for (int j = 0; j < max; ++j ) { | |
260 Node* child = n->raw_out(j); | |
261 if( ! useful.member(child) ) { | |
262 assert( !child->is_top() || child != top(), | |
263 "If top is cached in Compile object it is in useful list"); | |
264 // Only need to remove this out-edge to the useless node | |
265 n->raw_del_out(j); | |
266 --j; | |
267 --max; | |
268 } | |
269 } | |
270 if (n->outcnt() == 1 && n->has_special_unique_user()) { | |
271 record_for_igvn( n->unique_out() ); | |
272 } | |
273 } | |
274 debug_only(verify_graph_edges(true/*check for no_dead_code*/);) | |
275 } | |
276 | |
277 //------------------------------frame_size_in_words----------------------------- | |
278 // frame_slots in units of words | |
279 int Compile::frame_size_in_words() const { | |
280 // shift is 0 in LP32 and 1 in LP64 | |
281 const int shift = (LogBytesPerWord - LogBytesPerInt); | |
282 int words = _frame_slots >> shift; | |
283 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" ); | |
284 return words; | |
285 } | |
286 | |
287 // ============================================================================ | |
288 //------------------------------CompileWrapper--------------------------------- | |
289 class CompileWrapper : public StackObj { | |
290 Compile *const _compile; | |
291 public: | |
292 CompileWrapper(Compile* compile); | |
293 | |
294 ~CompileWrapper(); | |
295 }; | |
296 | |
297 CompileWrapper::CompileWrapper(Compile* compile) : _compile(compile) { | |
298 // the Compile* pointer is stored in the current ciEnv: | |
299 ciEnv* env = compile->env(); | |
300 assert(env == ciEnv::current(), "must already be a ciEnv active"); | |
301 assert(env->compiler_data() == NULL, "compile already active?"); | |
302 env->set_compiler_data(compile); | |
303 assert(compile == Compile::current(), "sanity"); | |
304 | |
305 compile->set_type_dict(NULL); | |
306 compile->set_type_hwm(NULL); | |
307 compile->set_type_last_size(0); | |
308 compile->set_last_tf(NULL, NULL); | |
309 compile->set_indexSet_arena(NULL); | |
310 compile->set_indexSet_free_block_list(NULL); | |
311 compile->init_type_arena(); | |
312 Type::Initialize(compile); | |
313 _compile->set_scratch_buffer_blob(NULL); | |
314 _compile->begin_method(); | |
315 } | |
316 CompileWrapper::~CompileWrapper() { | |
317 _compile->end_method(); | |
318 if (_compile->scratch_buffer_blob() != NULL) | |
319 BufferBlob::free(_compile->scratch_buffer_blob()); | |
320 _compile->env()->set_compiler_data(NULL); | |
321 } | |
322 | |
323 | |
324 //----------------------------print_compile_messages--------------------------- | |
325 void Compile::print_compile_messages() { | |
326 #ifndef PRODUCT | |
327 // Check if recompiling | |
328 if (_subsume_loads == false && PrintOpto) { | |
329 // Recompiling without allowing machine instructions to subsume loads | |
330 tty->print_cr("*********************************************************"); | |
331 tty->print_cr("** Bailout: Recompile without subsuming loads **"); | |
332 tty->print_cr("*********************************************************"); | |
333 } | |
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334 if (_do_escape_analysis != DoEscapeAnalysis && PrintOpto) { |
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335 // Recompiling without escape analysis |
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336 tty->print_cr("*********************************************************"); |
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337 tty->print_cr("** Bailout: Recompile without escape analysis **"); |
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338 tty->print_cr("*********************************************************"); |
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339 } |
0 | 340 if (env()->break_at_compile()) { |
605 | 341 // Open the debugger when compiling this method. |
0 | 342 tty->print("### Breaking when compiling: "); |
343 method()->print_short_name(); | |
344 tty->cr(); | |
345 BREAKPOINT; | |
346 } | |
347 | |
348 if( PrintOpto ) { | |
349 if (is_osr_compilation()) { | |
350 tty->print("[OSR]%3d", _compile_id); | |
351 } else { | |
352 tty->print("%3d", _compile_id); | |
353 } | |
354 } | |
355 #endif | |
356 } | |
357 | |
358 | |
359 void Compile::init_scratch_buffer_blob() { | |
360 if( scratch_buffer_blob() != NULL ) return; | |
361 | |
362 // Construct a temporary CodeBuffer to have it construct a BufferBlob | |
363 // Cache this BufferBlob for this compile. | |
364 ResourceMark rm; | |
365 int size = (MAX_inst_size + MAX_stubs_size + MAX_const_size); | |
366 BufferBlob* blob = BufferBlob::create("Compile::scratch_buffer", size); | |
367 // Record the buffer blob for next time. | |
368 set_scratch_buffer_blob(blob); | |
163 | 369 // Have we run out of code space? |
370 if (scratch_buffer_blob() == NULL) { | |
371 // Let CompilerBroker disable further compilations. | |
372 record_failure("Not enough space for scratch buffer in CodeCache"); | |
373 return; | |
374 } | |
0 | 375 |
376 // Initialize the relocation buffers | |
377 relocInfo* locs_buf = (relocInfo*) blob->instructions_end() - MAX_locs_size; | |
378 set_scratch_locs_memory(locs_buf); | |
379 } | |
380 | |
381 | |
382 //-----------------------scratch_emit_size------------------------------------- | |
383 // Helper function that computes size by emitting code | |
384 uint Compile::scratch_emit_size(const Node* n) { | |
385 // Emit into a trash buffer and count bytes emitted. | |
386 // This is a pretty expensive way to compute a size, | |
387 // but it works well enough if seldom used. | |
388 // All common fixed-size instructions are given a size | |
389 // method by the AD file. | |
390 // Note that the scratch buffer blob and locs memory are | |
391 // allocated at the beginning of the compile task, and | |
392 // may be shared by several calls to scratch_emit_size. | |
393 // The allocation of the scratch buffer blob is particularly | |
394 // expensive, since it has to grab the code cache lock. | |
395 BufferBlob* blob = this->scratch_buffer_blob(); | |
396 assert(blob != NULL, "Initialize BufferBlob at start"); | |
397 assert(blob->size() > MAX_inst_size, "sanity"); | |
398 relocInfo* locs_buf = scratch_locs_memory(); | |
399 address blob_begin = blob->instructions_begin(); | |
400 address blob_end = (address)locs_buf; | |
401 assert(blob->instructions_contains(blob_end), "sanity"); | |
402 CodeBuffer buf(blob_begin, blob_end - blob_begin); | |
403 buf.initialize_consts_size(MAX_const_size); | |
404 buf.initialize_stubs_size(MAX_stubs_size); | |
405 assert(locs_buf != NULL, "sanity"); | |
406 int lsize = MAX_locs_size / 2; | |
407 buf.insts()->initialize_shared_locs(&locs_buf[0], lsize); | |
408 buf.stubs()->initialize_shared_locs(&locs_buf[lsize], lsize); | |
409 n->emit(buf, this->regalloc()); | |
410 return buf.code_size(); | |
411 } | |
412 | |
413 | |
414 // ============================================================================ | |
415 //------------------------------Compile standard------------------------------- | |
416 debug_only( int Compile::_debug_idx = 100000; ) | |
417 | |
418 // Compile a method. entry_bci is -1 for normal compilations and indicates | |
419 // the continuation bci for on stack replacement. | |
420 | |
421 | |
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422 Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr_bci, bool subsume_loads, bool do_escape_analysis ) |
0 | 423 : Phase(Compiler), |
424 _env(ci_env), | |
425 _log(ci_env->log()), | |
426 _compile_id(ci_env->compile_id()), | |
427 _save_argument_registers(false), | |
428 _stub_name(NULL), | |
429 _stub_function(NULL), | |
430 _stub_entry_point(NULL), | |
431 _method(target), | |
432 _entry_bci(osr_bci), | |
433 _initial_gvn(NULL), | |
434 _for_igvn(NULL), | |
435 _warm_calls(NULL), | |
436 _subsume_loads(subsume_loads), | |
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437 _do_escape_analysis(do_escape_analysis), |
0 | 438 _failure_reason(NULL), |
439 _code_buffer("Compile::Fill_buffer"), | |
440 _orig_pc_slot(0), | |
441 _orig_pc_slot_offset_in_bytes(0), | |
442 _node_bundling_limit(0), | |
443 _node_bundling_base(NULL), | |
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444 _java_calls(0), |
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445 _inner_loops(0), |
0 | 446 #ifndef PRODUCT |
447 _trace_opto_output(TraceOptoOutput || method()->has_option("TraceOptoOutput")), | |
448 _printer(IdealGraphPrinter::printer()), | |
449 #endif | |
450 _congraph(NULL) { | |
451 C = this; | |
452 | |
453 CompileWrapper cw(this); | |
454 #ifndef PRODUCT | |
455 if (TimeCompiler2) { | |
456 tty->print(" "); | |
457 target->holder()->name()->print(); | |
458 tty->print("."); | |
459 target->print_short_name(); | |
460 tty->print(" "); | |
461 } | |
462 TraceTime t1("Total compilation time", &_t_totalCompilation, TimeCompiler, TimeCompiler2); | |
463 TraceTime t2(NULL, &_t_methodCompilation, TimeCompiler, false); | |
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464 bool print_opto_assembly = PrintOptoAssembly || _method->has_option("PrintOptoAssembly"); |
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465 if (!print_opto_assembly) { |
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466 bool print_assembly = (PrintAssembly || _method->should_print_assembly()); |
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467 if (print_assembly && !Disassembler::can_decode()) { |
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468 tty->print_cr("PrintAssembly request changed to PrintOptoAssembly"); |
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469 print_opto_assembly = true; |
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470 } |
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471 } |
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472 set_print_assembly(print_opto_assembly); |
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473 set_parsed_irreducible_loop(false); |
0 | 474 #endif |
475 | |
476 if (ProfileTraps) { | |
477 // Make sure the method being compiled gets its own MDO, | |
478 // so we can at least track the decompile_count(). | |
479 method()->build_method_data(); | |
480 } | |
481 | |
482 Init(::AliasLevel); | |
483 | |
484 | |
485 print_compile_messages(); | |
486 | |
487 if (UseOldInlining || PrintCompilation NOT_PRODUCT( || PrintOpto) ) | |
488 _ilt = InlineTree::build_inline_tree_root(); | |
489 else | |
490 _ilt = NULL; | |
491 | |
492 // Even if NO memory addresses are used, MergeMem nodes must have at least 1 slice | |
493 assert(num_alias_types() >= AliasIdxRaw, ""); | |
494 | |
495 #define MINIMUM_NODE_HASH 1023 | |
496 // Node list that Iterative GVN will start with | |
497 Unique_Node_List for_igvn(comp_arena()); | |
498 set_for_igvn(&for_igvn); | |
499 | |
500 // GVN that will be run immediately on new nodes | |
501 uint estimated_size = method()->code_size()*4+64; | |
502 estimated_size = (estimated_size < MINIMUM_NODE_HASH ? MINIMUM_NODE_HASH : estimated_size); | |
503 PhaseGVN gvn(node_arena(), estimated_size); | |
504 set_initial_gvn(&gvn); | |
505 | |
506 { // Scope for timing the parser | |
507 TracePhase t3("parse", &_t_parser, true); | |
508 | |
509 // Put top into the hash table ASAP. | |
510 initial_gvn()->transform_no_reclaim(top()); | |
511 | |
512 // Set up tf(), start(), and find a CallGenerator. | |
513 CallGenerator* cg; | |
514 if (is_osr_compilation()) { | |
515 const TypeTuple *domain = StartOSRNode::osr_domain(); | |
516 const TypeTuple *range = TypeTuple::make_range(method()->signature()); | |
517 init_tf(TypeFunc::make(domain, range)); | |
518 StartNode* s = new (this, 2) StartOSRNode(root(), domain); | |
519 initial_gvn()->set_type_bottom(s); | |
520 init_start(s); | |
521 cg = CallGenerator::for_osr(method(), entry_bci()); | |
522 } else { | |
523 // Normal case. | |
524 init_tf(TypeFunc::make(method())); | |
525 StartNode* s = new (this, 2) StartNode(root(), tf()->domain()); | |
526 initial_gvn()->set_type_bottom(s); | |
527 init_start(s); | |
528 float past_uses = method()->interpreter_invocation_count(); | |
529 float expected_uses = past_uses; | |
530 cg = CallGenerator::for_inline(method(), expected_uses); | |
531 } | |
532 if (failing()) return; | |
533 if (cg == NULL) { | |
534 record_method_not_compilable_all_tiers("cannot parse method"); | |
535 return; | |
536 } | |
537 JVMState* jvms = build_start_state(start(), tf()); | |
538 if ((jvms = cg->generate(jvms)) == NULL) { | |
539 record_method_not_compilable("method parse failed"); | |
540 return; | |
541 } | |
542 GraphKit kit(jvms); | |
543 | |
544 if (!kit.stopped()) { | |
545 // Accept return values, and transfer control we know not where. | |
546 // This is done by a special, unique ReturnNode bound to root. | |
547 return_values(kit.jvms()); | |
548 } | |
549 | |
550 if (kit.has_exceptions()) { | |
551 // Any exceptions that escape from this call must be rethrown | |
552 // to whatever caller is dynamically above us on the stack. | |
553 // This is done by a special, unique RethrowNode bound to root. | |
554 rethrow_exceptions(kit.transfer_exceptions_into_jvms()); | |
555 } | |
556 | |
417 | 557 print_method("Before RemoveUseless", 3); |
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558 |
0 | 559 // Remove clutter produced by parsing. |
560 if (!failing()) { | |
561 ResourceMark rm; | |
562 PhaseRemoveUseless pru(initial_gvn(), &for_igvn); | |
563 } | |
564 } | |
565 | |
566 // Note: Large methods are capped off in do_one_bytecode(). | |
567 if (failing()) return; | |
568 | |
569 // After parsing, node notes are no longer automagic. | |
570 // They must be propagated by register_new_node_with_optimizer(), | |
571 // clone(), or the like. | |
572 set_default_node_notes(NULL); | |
573 | |
574 for (;;) { | |
575 int successes = Inline_Warm(); | |
576 if (failing()) return; | |
577 if (successes == 0) break; | |
578 } | |
579 | |
580 // Drain the list. | |
581 Finish_Warm(); | |
582 #ifndef PRODUCT | |
583 if (_printer) { | |
584 _printer->print_inlining(this); | |
585 } | |
586 #endif | |
587 | |
588 if (failing()) return; | |
589 NOT_PRODUCT( verify_graph_edges(); ) | |
590 | |
591 // Perform escape analysis | |
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592 if (_do_escape_analysis && ConnectionGraph::has_candidates(this)) { |
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593 TracePhase t2("escapeAnalysis", &_t_escapeAnalysis, true); |
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594 // Add ConP#NULL and ConN#NULL nodes before ConnectionGraph construction. |
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595 PhaseGVN* igvn = initial_gvn(); |
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596 Node* oop_null = igvn->zerocon(T_OBJECT); |
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597 Node* noop_null = igvn->zerocon(T_NARROWOOP); |
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598 |
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599 _congraph = new(comp_arena()) ConnectionGraph(this); |
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600 bool has_non_escaping_obj = _congraph->compute_escape(); |
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601 |
0 | 602 #ifndef PRODUCT |
603 if (PrintEscapeAnalysis) { | |
604 _congraph->dump(); | |
605 } | |
606 #endif | |
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607 // Cleanup. |
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608 if (oop_null->outcnt() == 0) |
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609 igvn->hash_delete(oop_null); |
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610 if (noop_null->outcnt() == 0) |
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611 igvn->hash_delete(noop_null); |
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612 |
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613 if (!has_non_escaping_obj) { |
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614 _congraph = NULL; |
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615 } |
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616 |
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617 if (failing()) return; |
0 | 618 } |
619 // Now optimize | |
620 Optimize(); | |
621 if (failing()) return; | |
622 NOT_PRODUCT( verify_graph_edges(); ) | |
623 | |
624 #ifndef PRODUCT | |
625 if (PrintIdeal) { | |
626 ttyLocker ttyl; // keep the following output all in one block | |
627 // This output goes directly to the tty, not the compiler log. | |
628 // To enable tools to match it up with the compilation activity, | |
629 // be sure to tag this tty output with the compile ID. | |
630 if (xtty != NULL) { | |
631 xtty->head("ideal compile_id='%d'%s", compile_id(), | |
632 is_osr_compilation() ? " compile_kind='osr'" : | |
633 ""); | |
634 } | |
635 root()->dump(9999); | |
636 if (xtty != NULL) { | |
637 xtty->tail("ideal"); | |
638 } | |
639 } | |
640 #endif | |
641 | |
642 // Now that we know the size of all the monitors we can add a fixed slot | |
643 // for the original deopt pc. | |
644 | |
645 _orig_pc_slot = fixed_slots(); | |
646 int next_slot = _orig_pc_slot + (sizeof(address) / VMRegImpl::stack_slot_size); | |
647 set_fixed_slots(next_slot); | |
648 | |
649 // Now generate code | |
650 Code_Gen(); | |
651 if (failing()) return; | |
652 | |
653 // Check if we want to skip execution of all compiled code. | |
654 { | |
655 #ifndef PRODUCT | |
656 if (OptoNoExecute) { | |
657 record_method_not_compilable("+OptoNoExecute"); // Flag as failed | |
658 return; | |
659 } | |
660 TracePhase t2("install_code", &_t_registerMethod, TimeCompiler); | |
661 #endif | |
662 | |
663 if (is_osr_compilation()) { | |
664 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0); | |
665 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size); | |
666 } else { | |
667 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size); | |
668 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0); | |
669 } | |
670 | |
671 env()->register_method(_method, _entry_bci, | |
672 &_code_offsets, | |
673 _orig_pc_slot_offset_in_bytes, | |
674 code_buffer(), | |
675 frame_size_in_words(), _oop_map_set, | |
676 &_handler_table, &_inc_table, | |
677 compiler, | |
678 env()->comp_level(), | |
679 true, /*has_debug_info*/ | |
680 has_unsafe_access() | |
681 ); | |
682 } | |
683 } | |
684 | |
685 //------------------------------Compile---------------------------------------- | |
686 // Compile a runtime stub | |
687 Compile::Compile( ciEnv* ci_env, | |
688 TypeFunc_generator generator, | |
689 address stub_function, | |
690 const char *stub_name, | |
691 int is_fancy_jump, | |
692 bool pass_tls, | |
693 bool save_arg_registers, | |
694 bool return_pc ) | |
695 : Phase(Compiler), | |
696 _env(ci_env), | |
697 _log(ci_env->log()), | |
698 _compile_id(-1), | |
699 _save_argument_registers(save_arg_registers), | |
700 _method(NULL), | |
701 _stub_name(stub_name), | |
702 _stub_function(stub_function), | |
703 _stub_entry_point(NULL), | |
704 _entry_bci(InvocationEntryBci), | |
705 _initial_gvn(NULL), | |
706 _for_igvn(NULL), | |
707 _warm_calls(NULL), | |
708 _orig_pc_slot(0), | |
709 _orig_pc_slot_offset_in_bytes(0), | |
710 _subsume_loads(true), | |
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711 _do_escape_analysis(false), |
0 | 712 _failure_reason(NULL), |
713 _code_buffer("Compile::Fill_buffer"), | |
714 _node_bundling_limit(0), | |
715 _node_bundling_base(NULL), | |
859
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716 _java_calls(0), |
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717 _inner_loops(0), |
0 | 718 #ifndef PRODUCT |
719 _trace_opto_output(TraceOptoOutput), | |
720 _printer(NULL), | |
721 #endif | |
722 _congraph(NULL) { | |
723 C = this; | |
724 | |
725 #ifndef PRODUCT | |
726 TraceTime t1(NULL, &_t_totalCompilation, TimeCompiler, false); | |
727 TraceTime t2(NULL, &_t_stubCompilation, TimeCompiler, false); | |
728 set_print_assembly(PrintFrameConverterAssembly); | |
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729 set_parsed_irreducible_loop(false); |
0 | 730 #endif |
731 CompileWrapper cw(this); | |
732 Init(/*AliasLevel=*/ 0); | |
733 init_tf((*generator)()); | |
734 | |
735 { | |
736 // The following is a dummy for the sake of GraphKit::gen_stub | |
737 Unique_Node_List for_igvn(comp_arena()); | |
738 set_for_igvn(&for_igvn); // not used, but some GraphKit guys push on this | |
739 PhaseGVN gvn(Thread::current()->resource_area(),255); | |
740 set_initial_gvn(&gvn); // not significant, but GraphKit guys use it pervasively | |
741 gvn.transform_no_reclaim(top()); | |
742 | |
743 GraphKit kit; | |
744 kit.gen_stub(stub_function, stub_name, is_fancy_jump, pass_tls, return_pc); | |
745 } | |
746 | |
747 NOT_PRODUCT( verify_graph_edges(); ) | |
748 Code_Gen(); | |
749 if (failing()) return; | |
750 | |
751 | |
752 // Entry point will be accessed using compile->stub_entry_point(); | |
753 if (code_buffer() == NULL) { | |
754 Matcher::soft_match_failure(); | |
755 } else { | |
756 if (PrintAssembly && (WizardMode || Verbose)) | |
757 tty->print_cr("### Stub::%s", stub_name); | |
758 | |
759 if (!failing()) { | |
760 assert(_fixed_slots == 0, "no fixed slots used for runtime stubs"); | |
761 | |
762 // Make the NMethod | |
763 // For now we mark the frame as never safe for profile stackwalking | |
764 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name, | |
765 code_buffer(), | |
766 CodeOffsets::frame_never_safe, | |
767 // _code_offsets.value(CodeOffsets::Frame_Complete), | |
768 frame_size_in_words(), | |
769 _oop_map_set, | |
770 save_arg_registers); | |
771 assert(rs != NULL && rs->is_runtime_stub(), "sanity check"); | |
772 | |
773 _stub_entry_point = rs->entry_point(); | |
774 } | |
775 } | |
776 } | |
777 | |
778 #ifndef PRODUCT | |
779 void print_opto_verbose_signature( const TypeFunc *j_sig, const char *stub_name ) { | |
780 if(PrintOpto && Verbose) { | |
781 tty->print("%s ", stub_name); j_sig->print_flattened(); tty->cr(); | |
782 } | |
783 } | |
784 #endif | |
785 | |
786 void Compile::print_codes() { | |
787 } | |
788 | |
789 //------------------------------Init------------------------------------------- | |
790 // Prepare for a single compilation | |
791 void Compile::Init(int aliaslevel) { | |
792 _unique = 0; | |
793 _regalloc = NULL; | |
794 | |
795 _tf = NULL; // filled in later | |
796 _top = NULL; // cached later | |
797 _matcher = NULL; // filled in later | |
798 _cfg = NULL; // filled in later | |
799 | |
800 set_24_bit_selection_and_mode(Use24BitFP, false); | |
801 | |
802 _node_note_array = NULL; | |
803 _default_node_notes = NULL; | |
804 | |
805 _immutable_memory = NULL; // filled in at first inquiry | |
806 | |
807 // Globally visible Nodes | |
808 // First set TOP to NULL to give safe behavior during creation of RootNode | |
809 set_cached_top_node(NULL); | |
810 set_root(new (this, 3) RootNode()); | |
811 // Now that you have a Root to point to, create the real TOP | |
812 set_cached_top_node( new (this, 1) ConNode(Type::TOP) ); | |
813 set_recent_alloc(NULL, NULL); | |
814 | |
815 // Create Debug Information Recorder to record scopes, oopmaps, etc. | |
816 env()->set_oop_recorder(new OopRecorder(comp_arena())); | |
817 env()->set_debug_info(new DebugInformationRecorder(env()->oop_recorder())); | |
818 env()->set_dependencies(new Dependencies(env())); | |
819 | |
820 _fixed_slots = 0; | |
821 set_has_split_ifs(false); | |
822 set_has_loops(has_method() && method()->has_loops()); // first approximation | |
823 _deopt_happens = true; // start out assuming the worst | |
824 _trap_can_recompile = false; // no traps emitted yet | |
825 _major_progress = true; // start out assuming good things will happen | |
826 set_has_unsafe_access(false); | |
827 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist)); | |
828 set_decompile_count(0); | |
829 | |
418 | 830 set_do_freq_based_layout(BlockLayoutByFrequency || method_has_option("BlockLayoutByFrequency")); |
0 | 831 // Compilation level related initialization |
832 if (env()->comp_level() == CompLevel_fast_compile) { | |
833 set_num_loop_opts(Tier1LoopOptsCount); | |
834 set_do_inlining(Tier1Inline != 0); | |
835 set_max_inline_size(Tier1MaxInlineSize); | |
836 set_freq_inline_size(Tier1FreqInlineSize); | |
837 set_do_scheduling(false); | |
838 set_do_count_invocations(Tier1CountInvocations); | |
839 set_do_method_data_update(Tier1UpdateMethodData); | |
840 } else { | |
841 assert(env()->comp_level() == CompLevel_full_optimization, "unknown comp level"); | |
842 set_num_loop_opts(LoopOptsCount); | |
843 set_do_inlining(Inline); | |
844 set_max_inline_size(MaxInlineSize); | |
845 set_freq_inline_size(FreqInlineSize); | |
846 set_do_scheduling(OptoScheduling); | |
847 set_do_count_invocations(false); | |
848 set_do_method_data_update(false); | |
849 } | |
850 | |
851 if (debug_info()->recording_non_safepoints()) { | |
852 set_node_note_array(new(comp_arena()) GrowableArray<Node_Notes*> | |
853 (comp_arena(), 8, 0, NULL)); | |
854 set_default_node_notes(Node_Notes::make(this)); | |
855 } | |
856 | |
857 // // -- Initialize types before each compile -- | |
858 // // Update cached type information | |
859 // if( _method && _method->constants() ) | |
860 // Type::update_loaded_types(_method, _method->constants()); | |
861 | |
862 // Init alias_type map. | |
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863 if (!_do_escape_analysis && aliaslevel == 3) |
0 | 864 aliaslevel = 2; // No unique types without escape analysis |
865 _AliasLevel = aliaslevel; | |
866 const int grow_ats = 16; | |
867 _max_alias_types = grow_ats; | |
868 _alias_types = NEW_ARENA_ARRAY(comp_arena(), AliasType*, grow_ats); | |
869 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, grow_ats); | |
870 Copy::zero_to_bytes(ats, sizeof(AliasType)*grow_ats); | |
871 { | |
872 for (int i = 0; i < grow_ats; i++) _alias_types[i] = &ats[i]; | |
873 } | |
874 // Initialize the first few types. | |
875 _alias_types[AliasIdxTop]->Init(AliasIdxTop, NULL); | |
876 _alias_types[AliasIdxBot]->Init(AliasIdxBot, TypePtr::BOTTOM); | |
877 _alias_types[AliasIdxRaw]->Init(AliasIdxRaw, TypeRawPtr::BOTTOM); | |
878 _num_alias_types = AliasIdxRaw+1; | |
879 // Zero out the alias type cache. | |
880 Copy::zero_to_bytes(_alias_cache, sizeof(_alias_cache)); | |
881 // A NULL adr_type hits in the cache right away. Preload the right answer. | |
882 probe_alias_cache(NULL)->_index = AliasIdxTop; | |
883 | |
884 _intrinsics = NULL; | |
885 _macro_nodes = new GrowableArray<Node*>(comp_arena(), 8, 0, NULL); | |
886 register_library_intrinsics(); | |
887 } | |
888 | |
889 //---------------------------init_start---------------------------------------- | |
890 // Install the StartNode on this compile object. | |
891 void Compile::init_start(StartNode* s) { | |
892 if (failing()) | |
893 return; // already failing | |
894 assert(s == start(), ""); | |
895 } | |
896 | |
897 StartNode* Compile::start() const { | |
898 assert(!failing(), ""); | |
899 for (DUIterator_Fast imax, i = root()->fast_outs(imax); i < imax; i++) { | |
900 Node* start = root()->fast_out(i); | |
901 if( start->is_Start() ) | |
902 return start->as_Start(); | |
903 } | |
904 ShouldNotReachHere(); | |
905 return NULL; | |
906 } | |
907 | |
908 //-------------------------------immutable_memory------------------------------------- | |
909 // Access immutable memory | |
910 Node* Compile::immutable_memory() { | |
911 if (_immutable_memory != NULL) { | |
912 return _immutable_memory; | |
913 } | |
914 StartNode* s = start(); | |
915 for (DUIterator_Fast imax, i = s->fast_outs(imax); true; i++) { | |
916 Node *p = s->fast_out(i); | |
917 if (p != s && p->as_Proj()->_con == TypeFunc::Memory) { | |
918 _immutable_memory = p; | |
919 return _immutable_memory; | |
920 } | |
921 } | |
922 ShouldNotReachHere(); | |
923 return NULL; | |
924 } | |
925 | |
926 //----------------------set_cached_top_node------------------------------------ | |
927 // Install the cached top node, and make sure Node::is_top works correctly. | |
928 void Compile::set_cached_top_node(Node* tn) { | |
929 if (tn != NULL) verify_top(tn); | |
930 Node* old_top = _top; | |
931 _top = tn; | |
932 // Calling Node::setup_is_top allows the nodes the chance to adjust | |
933 // their _out arrays. | |
934 if (_top != NULL) _top->setup_is_top(); | |
935 if (old_top != NULL) old_top->setup_is_top(); | |
936 assert(_top == NULL || top()->is_top(), ""); | |
937 } | |
938 | |
939 #ifndef PRODUCT | |
940 void Compile::verify_top(Node* tn) const { | |
941 if (tn != NULL) { | |
942 assert(tn->is_Con(), "top node must be a constant"); | |
943 assert(((ConNode*)tn)->type() == Type::TOP, "top node must have correct type"); | |
944 assert(tn->in(0) != NULL, "must have live top node"); | |
945 } | |
946 } | |
947 #endif | |
948 | |
949 | |
950 ///-------------------Managing Per-Node Debug & Profile Info------------------- | |
951 | |
952 void Compile::grow_node_notes(GrowableArray<Node_Notes*>* arr, int grow_by) { | |
953 guarantee(arr != NULL, ""); | |
954 int num_blocks = arr->length(); | |
955 if (grow_by < num_blocks) grow_by = num_blocks; | |
956 int num_notes = grow_by * _node_notes_block_size; | |
957 Node_Notes* notes = NEW_ARENA_ARRAY(node_arena(), Node_Notes, num_notes); | |
958 Copy::zero_to_bytes(notes, num_notes * sizeof(Node_Notes)); | |
959 while (num_notes > 0) { | |
960 arr->append(notes); | |
961 notes += _node_notes_block_size; | |
962 num_notes -= _node_notes_block_size; | |
963 } | |
964 assert(num_notes == 0, "exact multiple, please"); | |
965 } | |
966 | |
967 bool Compile::copy_node_notes_to(Node* dest, Node* source) { | |
968 if (source == NULL || dest == NULL) return false; | |
969 | |
970 if (dest->is_Con()) | |
971 return false; // Do not push debug info onto constants. | |
972 | |
973 #ifdef ASSERT | |
974 // Leave a bread crumb trail pointing to the original node: | |
975 if (dest != NULL && dest != source && dest->debug_orig() == NULL) { | |
976 dest->set_debug_orig(source); | |
977 } | |
978 #endif | |
979 | |
980 if (node_note_array() == NULL) | |
981 return false; // Not collecting any notes now. | |
982 | |
983 // This is a copy onto a pre-existing node, which may already have notes. | |
984 // If both nodes have notes, do not overwrite any pre-existing notes. | |
985 Node_Notes* source_notes = node_notes_at(source->_idx); | |
986 if (source_notes == NULL || source_notes->is_clear()) return false; | |
987 Node_Notes* dest_notes = node_notes_at(dest->_idx); | |
988 if (dest_notes == NULL || dest_notes->is_clear()) { | |
989 return set_node_notes_at(dest->_idx, source_notes); | |
990 } | |
991 | |
992 Node_Notes merged_notes = (*source_notes); | |
993 // The order of operations here ensures that dest notes will win... | |
994 merged_notes.update_from(dest_notes); | |
995 return set_node_notes_at(dest->_idx, &merged_notes); | |
996 } | |
997 | |
998 | |
999 //--------------------------allow_range_check_smearing------------------------- | |
1000 // Gating condition for coalescing similar range checks. | |
1001 // Sometimes we try 'speculatively' replacing a series of a range checks by a | |
1002 // single covering check that is at least as strong as any of them. | |
1003 // If the optimization succeeds, the simplified (strengthened) range check | |
1004 // will always succeed. If it fails, we will deopt, and then give up | |
1005 // on the optimization. | |
1006 bool Compile::allow_range_check_smearing() const { | |
1007 // If this method has already thrown a range-check, | |
1008 // assume it was because we already tried range smearing | |
1009 // and it failed. | |
1010 uint already_trapped = trap_count(Deoptimization::Reason_range_check); | |
1011 return !already_trapped; | |
1012 } | |
1013 | |
1014 | |
1015 //------------------------------flatten_alias_type----------------------------- | |
1016 const TypePtr *Compile::flatten_alias_type( const TypePtr *tj ) const { | |
1017 int offset = tj->offset(); | |
1018 TypePtr::PTR ptr = tj->ptr(); | |
1019 | |
247 | 1020 // Known instance (scalarizable allocation) alias only with itself. |
1021 bool is_known_inst = tj->isa_oopptr() != NULL && | |
1022 tj->is_oopptr()->is_known_instance(); | |
1023 | |
0 | 1024 // Process weird unsafe references. |
1025 if (offset == Type::OffsetBot && (tj->isa_instptr() /*|| tj->isa_klassptr()*/)) { | |
1026 assert(InlineUnsafeOps, "indeterminate pointers come only from unsafe ops"); | |
247 | 1027 assert(!is_known_inst, "scalarizable allocation should not have unsafe references"); |
0 | 1028 tj = TypeOopPtr::BOTTOM; |
1029 ptr = tj->ptr(); | |
1030 offset = tj->offset(); | |
1031 } | |
1032 | |
1033 // Array pointers need some flattening | |
1034 const TypeAryPtr *ta = tj->isa_aryptr(); | |
247 | 1035 if( ta && is_known_inst ) { |
1036 if ( offset != Type::OffsetBot && | |
1037 offset > arrayOopDesc::length_offset_in_bytes() ) { | |
1038 offset = Type::OffsetBot; // Flatten constant access into array body only | |
1039 tj = ta = TypeAryPtr::make(ptr, ta->ary(), ta->klass(), true, offset, ta->instance_id()); | |
1040 } | |
1041 } else if( ta && _AliasLevel >= 2 ) { | |
0 | 1042 // For arrays indexed by constant indices, we flatten the alias |
1043 // space to include all of the array body. Only the header, klass | |
1044 // and array length can be accessed un-aliased. | |
1045 if( offset != Type::OffsetBot ) { | |
1046 if( ta->const_oop() ) { // methodDataOop or methodOop | |
1047 offset = Type::OffsetBot; // Flatten constant access into array body | |
247 | 1048 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),ta->ary(),ta->klass(),false,offset); |
0 | 1049 } else if( offset == arrayOopDesc::length_offset_in_bytes() ) { |
1050 // range is OK as-is. | |
1051 tj = ta = TypeAryPtr::RANGE; | |
1052 } else if( offset == oopDesc::klass_offset_in_bytes() ) { | |
1053 tj = TypeInstPtr::KLASS; // all klass loads look alike | |
1054 ta = TypeAryPtr::RANGE; // generic ignored junk | |
1055 ptr = TypePtr::BotPTR; | |
1056 } else if( offset == oopDesc::mark_offset_in_bytes() ) { | |
1057 tj = TypeInstPtr::MARK; | |
1058 ta = TypeAryPtr::RANGE; // generic ignored junk | |
1059 ptr = TypePtr::BotPTR; | |
1060 } else { // Random constant offset into array body | |
1061 offset = Type::OffsetBot; // Flatten constant access into array body | |
247 | 1062 tj = ta = TypeAryPtr::make(ptr,ta->ary(),ta->klass(),false,offset); |
0 | 1063 } |
1064 } | |
1065 // Arrays of fixed size alias with arrays of unknown size. | |
1066 if (ta->size() != TypeInt::POS) { | |
1067 const TypeAry *tary = TypeAry::make(ta->elem(), TypeInt::POS); | |
247 | 1068 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,ta->klass(),false,offset); |
0 | 1069 } |
1070 // Arrays of known objects become arrays of unknown objects. | |
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1071 if (ta->elem()->isa_narrowoop() && ta->elem() != TypeNarrowOop::BOTTOM) { |
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1072 const TypeAry *tary = TypeAry::make(TypeNarrowOop::BOTTOM, ta->size()); |
247 | 1073 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,offset); |
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1074 } |
0 | 1075 if (ta->elem()->isa_oopptr() && ta->elem() != TypeInstPtr::BOTTOM) { |
1076 const TypeAry *tary = TypeAry::make(TypeInstPtr::BOTTOM, ta->size()); | |
247 | 1077 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,offset); |
0 | 1078 } |
1079 // Arrays of bytes and of booleans both use 'bastore' and 'baload' so | |
1080 // cannot be distinguished by bytecode alone. | |
1081 if (ta->elem() == TypeInt::BOOL) { | |
1082 const TypeAry *tary = TypeAry::make(TypeInt::BYTE, ta->size()); | |
1083 ciKlass* aklass = ciTypeArrayKlass::make(T_BYTE); | |
247 | 1084 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,aklass,false,offset); |
0 | 1085 } |
1086 // During the 2nd round of IterGVN, NotNull castings are removed. | |
1087 // Make sure the Bottom and NotNull variants alias the same. | |
1088 // Also, make sure exact and non-exact variants alias the same. | |
1089 if( ptr == TypePtr::NotNull || ta->klass_is_exact() ) { | |
1090 if (ta->const_oop()) { | |
1091 tj = ta = TypeAryPtr::make(TypePtr::Constant,ta->const_oop(),ta->ary(),ta->klass(),false,offset); | |
1092 } else { | |
1093 tj = ta = TypeAryPtr::make(TypePtr::BotPTR,ta->ary(),ta->klass(),false,offset); | |
1094 } | |
1095 } | |
1096 } | |
1097 | |
1098 // Oop pointers need some flattening | |
1099 const TypeInstPtr *to = tj->isa_instptr(); | |
1100 if( to && _AliasLevel >= 2 && to != TypeOopPtr::BOTTOM ) { | |
1101 if( ptr == TypePtr::Constant ) { | |
1102 // No constant oop pointers (such as Strings); they alias with | |
1103 // unknown strings. | |
247 | 1104 assert(!is_known_inst, "not scalarizable allocation"); |
0 | 1105 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset); |
247 | 1106 } else if( is_known_inst ) { |
163 | 1107 tj = to; // Keep NotNull and klass_is_exact for instance type |
0 | 1108 } else if( ptr == TypePtr::NotNull || to->klass_is_exact() ) { |
1109 // During the 2nd round of IterGVN, NotNull castings are removed. | |
1110 // Make sure the Bottom and NotNull variants alias the same. | |
1111 // Also, make sure exact and non-exact variants alias the same. | |
247 | 1112 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset); |
0 | 1113 } |
1114 // Canonicalize the holder of this field | |
1115 ciInstanceKlass *k = to->klass()->as_instance_klass(); | |
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1116 if (offset >= 0 && offset < instanceOopDesc::base_offset_in_bytes()) { |
0 | 1117 // First handle header references such as a LoadKlassNode, even if the |
1118 // object's klass is unloaded at compile time (4965979). | |
247 | 1119 if (!is_known_inst) { // Do it only for non-instance types |
1120 tj = to = TypeInstPtr::make(TypePtr::BotPTR, env()->Object_klass(), false, NULL, offset); | |
1121 } | |
0 | 1122 } else if (offset < 0 || offset >= k->size_helper() * wordSize) { |
1123 to = NULL; | |
1124 tj = TypeOopPtr::BOTTOM; | |
1125 offset = tj->offset(); | |
1126 } else { | |
1127 ciInstanceKlass *canonical_holder = k->get_canonical_holder(offset); | |
1128 if (!k->equals(canonical_holder) || tj->offset() != offset) { | |
247 | 1129 if( is_known_inst ) { |
1130 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, true, NULL, offset, to->instance_id()); | |
1131 } else { | |
1132 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, false, NULL, offset); | |
1133 } | |
0 | 1134 } |
1135 } | |
1136 } | |
1137 | |
1138 // Klass pointers to object array klasses need some flattening | |
1139 const TypeKlassPtr *tk = tj->isa_klassptr(); | |
1140 if( tk ) { | |
1141 // If we are referencing a field within a Klass, we need | |
1142 // to assume the worst case of an Object. Both exact and | |
1143 // inexact types must flatten to the same alias class. | |
1144 // Since the flattened result for a klass is defined to be | |
1145 // precisely java.lang.Object, use a constant ptr. | |
1146 if ( offset == Type::OffsetBot || (offset >= 0 && (size_t)offset < sizeof(Klass)) ) { | |
1147 | |
1148 tj = tk = TypeKlassPtr::make(TypePtr::Constant, | |
1149 TypeKlassPtr::OBJECT->klass(), | |
1150 offset); | |
1151 } | |
1152 | |
1153 ciKlass* klass = tk->klass(); | |
1154 if( klass->is_obj_array_klass() ) { | |
1155 ciKlass* k = TypeAryPtr::OOPS->klass(); | |
1156 if( !k || !k->is_loaded() ) // Only fails for some -Xcomp runs | |
1157 k = TypeInstPtr::BOTTOM->klass(); | |
1158 tj = tk = TypeKlassPtr::make( TypePtr::NotNull, k, offset ); | |
1159 } | |
1160 | |
1161 // Check for precise loads from the primary supertype array and force them | |
1162 // to the supertype cache alias index. Check for generic array loads from | |
1163 // the primary supertype array and also force them to the supertype cache | |
1164 // alias index. Since the same load can reach both, we need to merge | |
1165 // these 2 disparate memories into the same alias class. Since the | |
1166 // primary supertype array is read-only, there's no chance of confusion | |
1167 // where we bypass an array load and an array store. | |
1168 uint off2 = offset - Klass::primary_supers_offset_in_bytes(); | |
1169 if( offset == Type::OffsetBot || | |
1170 off2 < Klass::primary_super_limit()*wordSize ) { | |
1171 offset = sizeof(oopDesc) +Klass::secondary_super_cache_offset_in_bytes(); | |
1172 tj = tk = TypeKlassPtr::make( TypePtr::NotNull, tk->klass(), offset ); | |
1173 } | |
1174 } | |
1175 | |
1176 // Flatten all Raw pointers together. | |
1177 if (tj->base() == Type::RawPtr) | |
1178 tj = TypeRawPtr::BOTTOM; | |
1179 | |
1180 if (tj->base() == Type::AnyPtr) | |
1181 tj = TypePtr::BOTTOM; // An error, which the caller must check for. | |
1182 | |
1183 // Flatten all to bottom for now | |
1184 switch( _AliasLevel ) { | |
1185 case 0: | |
1186 tj = TypePtr::BOTTOM; | |
1187 break; | |
1188 case 1: // Flatten to: oop, static, field or array | |
1189 switch (tj->base()) { | |
1190 //case Type::AryPtr: tj = TypeAryPtr::RANGE; break; | |
1191 case Type::RawPtr: tj = TypeRawPtr::BOTTOM; break; | |
1192 case Type::AryPtr: // do not distinguish arrays at all | |
1193 case Type::InstPtr: tj = TypeInstPtr::BOTTOM; break; | |
1194 case Type::KlassPtr: tj = TypeKlassPtr::OBJECT; break; | |
1195 case Type::AnyPtr: tj = TypePtr::BOTTOM; break; // caller checks it | |
1196 default: ShouldNotReachHere(); | |
1197 } | |
1198 break; | |
605 | 1199 case 2: // No collapsing at level 2; keep all splits |
1200 case 3: // No collapsing at level 3; keep all splits | |
0 | 1201 break; |
1202 default: | |
1203 Unimplemented(); | |
1204 } | |
1205 | |
1206 offset = tj->offset(); | |
1207 assert( offset != Type::OffsetTop, "Offset has fallen from constant" ); | |
1208 | |
1209 assert( (offset != Type::OffsetBot && tj->base() != Type::AryPtr) || | |
1210 (offset == Type::OffsetBot && tj->base() == Type::AryPtr) || | |
1211 (offset == Type::OffsetBot && tj == TypeOopPtr::BOTTOM) || | |
1212 (offset == Type::OffsetBot && tj == TypePtr::BOTTOM) || | |
1213 (offset == oopDesc::mark_offset_in_bytes() && tj->base() == Type::AryPtr) || | |
1214 (offset == oopDesc::klass_offset_in_bytes() && tj->base() == Type::AryPtr) || | |
1215 (offset == arrayOopDesc::length_offset_in_bytes() && tj->base() == Type::AryPtr) , | |
1216 "For oops, klasses, raw offset must be constant; for arrays the offset is never known" ); | |
1217 assert( tj->ptr() != TypePtr::TopPTR && | |
1218 tj->ptr() != TypePtr::AnyNull && | |
1219 tj->ptr() != TypePtr::Null, "No imprecise addresses" ); | |
1220 // assert( tj->ptr() != TypePtr::Constant || | |
1221 // tj->base() == Type::RawPtr || | |
1222 // tj->base() == Type::KlassPtr, "No constant oop addresses" ); | |
1223 | |
1224 return tj; | |
1225 } | |
1226 | |
1227 void Compile::AliasType::Init(int i, const TypePtr* at) { | |
1228 _index = i; | |
1229 _adr_type = at; | |
1230 _field = NULL; | |
1231 _is_rewritable = true; // default | |
1232 const TypeOopPtr *atoop = (at != NULL) ? at->isa_oopptr() : NULL; | |
223 | 1233 if (atoop != NULL && atoop->is_known_instance()) { |
1234 const TypeOopPtr *gt = atoop->cast_to_instance_id(TypeOopPtr::InstanceBot); | |
0 | 1235 _general_index = Compile::current()->get_alias_index(gt); |
1236 } else { | |
1237 _general_index = 0; | |
1238 } | |
1239 } | |
1240 | |
1241 //---------------------------------print_on------------------------------------ | |
1242 #ifndef PRODUCT | |
1243 void Compile::AliasType::print_on(outputStream* st) { | |
1244 if (index() < 10) | |
1245 st->print("@ <%d> ", index()); | |
1246 else st->print("@ <%d>", index()); | |
1247 st->print(is_rewritable() ? " " : " RO"); | |
1248 int offset = adr_type()->offset(); | |
1249 if (offset == Type::OffsetBot) | |
1250 st->print(" +any"); | |
1251 else st->print(" +%-3d", offset); | |
1252 st->print(" in "); | |
1253 adr_type()->dump_on(st); | |
1254 const TypeOopPtr* tjp = adr_type()->isa_oopptr(); | |
1255 if (field() != NULL && tjp) { | |
1256 if (tjp->klass() != field()->holder() || | |
1257 tjp->offset() != field()->offset_in_bytes()) { | |
1258 st->print(" != "); | |
1259 field()->print(); | |
1260 st->print(" ***"); | |
1261 } | |
1262 } | |
1263 } | |
1264 | |
1265 void print_alias_types() { | |
1266 Compile* C = Compile::current(); | |
1267 tty->print_cr("--- Alias types, AliasIdxBot .. %d", C->num_alias_types()-1); | |
1268 for (int idx = Compile::AliasIdxBot; idx < C->num_alias_types(); idx++) { | |
1269 C->alias_type(idx)->print_on(tty); | |
1270 tty->cr(); | |
1271 } | |
1272 } | |
1273 #endif | |
1274 | |
1275 | |
1276 //----------------------------probe_alias_cache-------------------------------- | |
1277 Compile::AliasCacheEntry* Compile::probe_alias_cache(const TypePtr* adr_type) { | |
1278 intptr_t key = (intptr_t) adr_type; | |
1279 key ^= key >> logAliasCacheSize; | |
1280 return &_alias_cache[key & right_n_bits(logAliasCacheSize)]; | |
1281 } | |
1282 | |
1283 | |
1284 //-----------------------------grow_alias_types-------------------------------- | |
1285 void Compile::grow_alias_types() { | |
1286 const int old_ats = _max_alias_types; // how many before? | |
1287 const int new_ats = old_ats; // how many more? | |
1288 const int grow_ats = old_ats+new_ats; // how many now? | |
1289 _max_alias_types = grow_ats; | |
1290 _alias_types = REALLOC_ARENA_ARRAY(comp_arena(), AliasType*, _alias_types, old_ats, grow_ats); | |
1291 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, new_ats); | |
1292 Copy::zero_to_bytes(ats, sizeof(AliasType)*new_ats); | |
1293 for (int i = 0; i < new_ats; i++) _alias_types[old_ats+i] = &ats[i]; | |
1294 } | |
1295 | |
1296 | |
1297 //--------------------------------find_alias_type------------------------------ | |
1298 Compile::AliasType* Compile::find_alias_type(const TypePtr* adr_type, bool no_create) { | |
1299 if (_AliasLevel == 0) | |
1300 return alias_type(AliasIdxBot); | |
1301 | |
1302 AliasCacheEntry* ace = probe_alias_cache(adr_type); | |
1303 if (ace->_adr_type == adr_type) { | |
1304 return alias_type(ace->_index); | |
1305 } | |
1306 | |
1307 // Handle special cases. | |
1308 if (adr_type == NULL) return alias_type(AliasIdxTop); | |
1309 if (adr_type == TypePtr::BOTTOM) return alias_type(AliasIdxBot); | |
1310 | |
1311 // Do it the slow way. | |
1312 const TypePtr* flat = flatten_alias_type(adr_type); | |
1313 | |
1314 #ifdef ASSERT | |
1315 assert(flat == flatten_alias_type(flat), "idempotent"); | |
1316 assert(flat != TypePtr::BOTTOM, "cannot alias-analyze an untyped ptr"); | |
1317 if (flat->isa_oopptr() && !flat->isa_klassptr()) { | |
1318 const TypeOopPtr* foop = flat->is_oopptr(); | |
247 | 1319 // Scalarizable allocations have exact klass always. |
1320 bool exact = !foop->klass_is_exact() || foop->is_known_instance(); | |
1321 const TypePtr* xoop = foop->cast_to_exactness(exact)->is_ptr(); | |
0 | 1322 assert(foop == flatten_alias_type(xoop), "exactness must not affect alias type"); |
1323 } | |
1324 assert(flat == flatten_alias_type(flat), "exact bit doesn't matter"); | |
1325 #endif | |
1326 | |
1327 int idx = AliasIdxTop; | |
1328 for (int i = 0; i < num_alias_types(); i++) { | |
1329 if (alias_type(i)->adr_type() == flat) { | |
1330 idx = i; | |
1331 break; | |
1332 } | |
1333 } | |
1334 | |
1335 if (idx == AliasIdxTop) { | |
1336 if (no_create) return NULL; | |
1337 // Grow the array if necessary. | |
1338 if (_num_alias_types == _max_alias_types) grow_alias_types(); | |
1339 // Add a new alias type. | |
1340 idx = _num_alias_types++; | |
1341 _alias_types[idx]->Init(idx, flat); | |
1342 if (flat == TypeInstPtr::KLASS) alias_type(idx)->set_rewritable(false); | |
1343 if (flat == TypeAryPtr::RANGE) alias_type(idx)->set_rewritable(false); | |
1344 if (flat->isa_instptr()) { | |
1345 if (flat->offset() == java_lang_Class::klass_offset_in_bytes() | |
1346 && flat->is_instptr()->klass() == env()->Class_klass()) | |
1347 alias_type(idx)->set_rewritable(false); | |
1348 } | |
1349 if (flat->isa_klassptr()) { | |
1350 if (flat->offset() == Klass::super_check_offset_offset_in_bytes() + (int)sizeof(oopDesc)) | |
1351 alias_type(idx)->set_rewritable(false); | |
1352 if (flat->offset() == Klass::modifier_flags_offset_in_bytes() + (int)sizeof(oopDesc)) | |
1353 alias_type(idx)->set_rewritable(false); | |
1354 if (flat->offset() == Klass::access_flags_offset_in_bytes() + (int)sizeof(oopDesc)) | |
1355 alias_type(idx)->set_rewritable(false); | |
1356 if (flat->offset() == Klass::java_mirror_offset_in_bytes() + (int)sizeof(oopDesc)) | |
1357 alias_type(idx)->set_rewritable(false); | |
1358 } | |
1359 // %%% (We would like to finalize JavaThread::threadObj_offset(), | |
1360 // but the base pointer type is not distinctive enough to identify | |
1361 // references into JavaThread.) | |
1362 | |
1363 // Check for final instance fields. | |
1364 const TypeInstPtr* tinst = flat->isa_instptr(); | |
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1365 if (tinst && tinst->offset() >= instanceOopDesc::base_offset_in_bytes()) { |
0 | 1366 ciInstanceKlass *k = tinst->klass()->as_instance_klass(); |
1367 ciField* field = k->get_field_by_offset(tinst->offset(), false); | |
1368 // Set field() and is_rewritable() attributes. | |
1369 if (field != NULL) alias_type(idx)->set_field(field); | |
1370 } | |
1371 const TypeKlassPtr* tklass = flat->isa_klassptr(); | |
1372 // Check for final static fields. | |
1373 if (tklass && tklass->klass()->is_instance_klass()) { | |
1374 ciInstanceKlass *k = tklass->klass()->as_instance_klass(); | |
1375 ciField* field = k->get_field_by_offset(tklass->offset(), true); | |
1376 // Set field() and is_rewritable() attributes. | |
1377 if (field != NULL) alias_type(idx)->set_field(field); | |
1378 } | |
1379 } | |
1380 | |
1381 // Fill the cache for next time. | |
1382 ace->_adr_type = adr_type; | |
1383 ace->_index = idx; | |
1384 assert(alias_type(adr_type) == alias_type(idx), "type must be installed"); | |
1385 | |
1386 // Might as well try to fill the cache for the flattened version, too. | |
1387 AliasCacheEntry* face = probe_alias_cache(flat); | |
1388 if (face->_adr_type == NULL) { | |
1389 face->_adr_type = flat; | |
1390 face->_index = idx; | |
1391 assert(alias_type(flat) == alias_type(idx), "flat type must work too"); | |
1392 } | |
1393 | |
1394 return alias_type(idx); | |
1395 } | |
1396 | |
1397 | |
1398 Compile::AliasType* Compile::alias_type(ciField* field) { | |
1399 const TypeOopPtr* t; | |
1400 if (field->is_static()) | |
1401 t = TypeKlassPtr::make(field->holder()); | |
1402 else | |
1403 t = TypeOopPtr::make_from_klass_raw(field->holder()); | |
1404 AliasType* atp = alias_type(t->add_offset(field->offset_in_bytes())); | |
1405 assert(field->is_final() == !atp->is_rewritable(), "must get the rewritable bits correct"); | |
1406 return atp; | |
1407 } | |
1408 | |
1409 | |
1410 //------------------------------have_alias_type-------------------------------- | |
1411 bool Compile::have_alias_type(const TypePtr* adr_type) { | |
1412 AliasCacheEntry* ace = probe_alias_cache(adr_type); | |
1413 if (ace->_adr_type == adr_type) { | |
1414 return true; | |
1415 } | |
1416 | |
1417 // Handle special cases. | |
1418 if (adr_type == NULL) return true; | |
1419 if (adr_type == TypePtr::BOTTOM) return true; | |
1420 | |
1421 return find_alias_type(adr_type, true) != NULL; | |
1422 } | |
1423 | |
1424 //-----------------------------must_alias-------------------------------------- | |
1425 // True if all values of the given address type are in the given alias category. | |
1426 bool Compile::must_alias(const TypePtr* adr_type, int alias_idx) { | |
1427 if (alias_idx == AliasIdxBot) return true; // the universal category | |
1428 if (adr_type == NULL) return true; // NULL serves as TypePtr::TOP | |
1429 if (alias_idx == AliasIdxTop) return false; // the empty category | |
1430 if (adr_type->base() == Type::AnyPtr) return false; // TypePtr::BOTTOM or its twins | |
1431 | |
1432 // the only remaining possible overlap is identity | |
1433 int adr_idx = get_alias_index(adr_type); | |
1434 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, ""); | |
1435 assert(adr_idx == alias_idx || | |
1436 (alias_type(alias_idx)->adr_type() != TypeOopPtr::BOTTOM | |
1437 && adr_type != TypeOopPtr::BOTTOM), | |
1438 "should not be testing for overlap with an unsafe pointer"); | |
1439 return adr_idx == alias_idx; | |
1440 } | |
1441 | |
1442 //------------------------------can_alias-------------------------------------- | |
1443 // True if any values of the given address type are in the given alias category. | |
1444 bool Compile::can_alias(const TypePtr* adr_type, int alias_idx) { | |
1445 if (alias_idx == AliasIdxTop) return false; // the empty category | |
1446 if (adr_type == NULL) return false; // NULL serves as TypePtr::TOP | |
1447 if (alias_idx == AliasIdxBot) return true; // the universal category | |
1448 if (adr_type->base() == Type::AnyPtr) return true; // TypePtr::BOTTOM or its twins | |
1449 | |
1450 // the only remaining possible overlap is identity | |
1451 int adr_idx = get_alias_index(adr_type); | |
1452 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, ""); | |
1453 return adr_idx == alias_idx; | |
1454 } | |
1455 | |
1456 | |
1457 | |
1458 //---------------------------pop_warm_call------------------------------------- | |
1459 WarmCallInfo* Compile::pop_warm_call() { | |
1460 WarmCallInfo* wci = _warm_calls; | |
1461 if (wci != NULL) _warm_calls = wci->remove_from(wci); | |
1462 return wci; | |
1463 } | |
1464 | |
1465 //----------------------------Inline_Warm-------------------------------------- | |
1466 int Compile::Inline_Warm() { | |
1467 // If there is room, try to inline some more warm call sites. | |
1468 // %%% Do a graph index compaction pass when we think we're out of space? | |
1469 if (!InlineWarmCalls) return 0; | |
1470 | |
1471 int calls_made_hot = 0; | |
1472 int room_to_grow = NodeCountInliningCutoff - unique(); | |
1473 int amount_to_grow = MIN2(room_to_grow, (int)NodeCountInliningStep); | |
1474 int amount_grown = 0; | |
1475 WarmCallInfo* call; | |
1476 while (amount_to_grow > 0 && (call = pop_warm_call()) != NULL) { | |
1477 int est_size = (int)call->size(); | |
1478 if (est_size > (room_to_grow - amount_grown)) { | |
1479 // This one won't fit anyway. Get rid of it. | |
1480 call->make_cold(); | |
1481 continue; | |
1482 } | |
1483 call->make_hot(); | |
1484 calls_made_hot++; | |
1485 amount_grown += est_size; | |
1486 amount_to_grow -= est_size; | |
1487 } | |
1488 | |
1489 if (calls_made_hot > 0) set_major_progress(); | |
1490 return calls_made_hot; | |
1491 } | |
1492 | |
1493 | |
1494 //----------------------------Finish_Warm-------------------------------------- | |
1495 void Compile::Finish_Warm() { | |
1496 if (!InlineWarmCalls) return; | |
1497 if (failing()) return; | |
1498 if (warm_calls() == NULL) return; | |
1499 | |
1500 // Clean up loose ends, if we are out of space for inlining. | |
1501 WarmCallInfo* call; | |
1502 while ((call = pop_warm_call()) != NULL) { | |
1503 call->make_cold(); | |
1504 } | |
1505 } | |
1506 | |
1507 | |
1508 //------------------------------Optimize--------------------------------------- | |
1509 // Given a graph, optimize it. | |
1510 void Compile::Optimize() { | |
1511 TracePhase t1("optimizer", &_t_optimizer, true); | |
1512 | |
1513 #ifndef PRODUCT | |
1514 if (env()->break_at_compile()) { | |
1515 BREAKPOINT; | |
1516 } | |
1517 | |
1518 #endif | |
1519 | |
1520 ResourceMark rm; | |
1521 int loop_opts_cnt; | |
1522 | |
1523 NOT_PRODUCT( verify_graph_edges(); ) | |
1524 | |
222 | 1525 print_method("After Parsing"); |
0 | 1526 |
1527 { | |
1528 // Iterative Global Value Numbering, including ideal transforms | |
1529 // Initialize IterGVN with types and values from parse-time GVN | |
1530 PhaseIterGVN igvn(initial_gvn()); | |
1531 { | |
1532 NOT_PRODUCT( TracePhase t2("iterGVN", &_t_iterGVN, TimeCompiler); ) | |
1533 igvn.optimize(); | |
1534 } | |
1535 | |
1536 print_method("Iter GVN 1", 2); | |
1537 | |
1538 if (failing()) return; | |
1539 | |
1540 // Loop transforms on the ideal graph. Range Check Elimination, | |
1541 // peeling, unrolling, etc. | |
1542 | |
1543 // Set loop opts counter | |
1544 loop_opts_cnt = num_loop_opts(); | |
1545 if((loop_opts_cnt > 0) && (has_loops() || has_split_ifs())) { | |
1546 { | |
1547 TracePhase t2("idealLoop", &_t_idealLoop, true); | |
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1548 PhaseIdealLoop ideal_loop( igvn, true ); |
0 | 1549 loop_opts_cnt--; |
1550 if (major_progress()) print_method("PhaseIdealLoop 1", 2); | |
1551 if (failing()) return; | |
1552 } | |
1553 // Loop opts pass if partial peeling occurred in previous pass | |
1554 if(PartialPeelLoop && major_progress() && (loop_opts_cnt > 0)) { | |
1555 TracePhase t3("idealLoop", &_t_idealLoop, true); | |
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1556 PhaseIdealLoop ideal_loop( igvn, false ); |
0 | 1557 loop_opts_cnt--; |
1558 if (major_progress()) print_method("PhaseIdealLoop 2", 2); | |
1559 if (failing()) return; | |
1560 } | |
1561 // Loop opts pass for loop-unrolling before CCP | |
1562 if(major_progress() && (loop_opts_cnt > 0)) { | |
1563 TracePhase t4("idealLoop", &_t_idealLoop, true); | |
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1564 PhaseIdealLoop ideal_loop( igvn, false ); |
0 | 1565 loop_opts_cnt--; |
1566 if (major_progress()) print_method("PhaseIdealLoop 3", 2); | |
1567 } | |
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1568 if (!failing()) { |
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1569 // Verify that last round of loop opts produced a valid graph |
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1570 NOT_PRODUCT( TracePhase t2("idealLoopVerify", &_t_idealLoopVerify, TimeCompiler); ) |
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1571 PhaseIdealLoop::verify(igvn); |
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1572 } |
0 | 1573 } |
1574 if (failing()) return; | |
1575 | |
1576 // Conditional Constant Propagation; | |
1577 PhaseCCP ccp( &igvn ); | |
1578 assert( true, "Break here to ccp.dump_nodes_and_types(_root,999,1)"); | |
1579 { | |
1580 TracePhase t2("ccp", &_t_ccp, true); | |
1581 ccp.do_transform(); | |
1582 } | |
1583 print_method("PhaseCPP 1", 2); | |
1584 | |
1585 assert( true, "Break here to ccp.dump_old2new_map()"); | |
1586 | |
1587 // Iterative Global Value Numbering, including ideal transforms | |
1588 { | |
1589 NOT_PRODUCT( TracePhase t2("iterGVN2", &_t_iterGVN2, TimeCompiler); ) | |
1590 igvn = ccp; | |
1591 igvn.optimize(); | |
1592 } | |
1593 | |
1594 print_method("Iter GVN 2", 2); | |
1595 | |
1596 if (failing()) return; | |
1597 | |
1598 // Loop transforms on the ideal graph. Range Check Elimination, | |
1599 // peeling, unrolling, etc. | |
1600 if(loop_opts_cnt > 0) { | |
1601 debug_only( int cnt = 0; ); | |
1602 while(major_progress() && (loop_opts_cnt > 0)) { | |
1603 TracePhase t2("idealLoop", &_t_idealLoop, true); | |
1604 assert( cnt++ < 40, "infinite cycle in loop optimization" ); | |
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1605 PhaseIdealLoop ideal_loop( igvn, true ); |
0 | 1606 loop_opts_cnt--; |
1607 if (major_progress()) print_method("PhaseIdealLoop iterations", 2); | |
1608 if (failing()) return; | |
1609 } | |
1610 } | |
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1611 |
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1612 { |
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1613 // Verify that all previous optimizations produced a valid graph |
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1614 // at least to this point, even if no loop optimizations were done. |
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1615 NOT_PRODUCT( TracePhase t2("idealLoopVerify", &_t_idealLoopVerify, TimeCompiler); ) |
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1616 PhaseIdealLoop::verify(igvn); |
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1617 } |
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1618 |
0 | 1619 { |
1620 NOT_PRODUCT( TracePhase t2("macroExpand", &_t_macroExpand, TimeCompiler); ) | |
1621 PhaseMacroExpand mex(igvn); | |
1622 if (mex.expand_macro_nodes()) { | |
1623 assert(failing(), "must bail out w/ explicit message"); | |
1624 return; | |
1625 } | |
1626 } | |
1627 | |
1628 } // (End scope of igvn; run destructor if necessary for asserts.) | |
1629 | |
1630 // A method with only infinite loops has no edges entering loops from root | |
1631 { | |
1632 NOT_PRODUCT( TracePhase t2("graphReshape", &_t_graphReshaping, TimeCompiler); ) | |
1633 if (final_graph_reshaping()) { | |
1634 assert(failing(), "must bail out w/ explicit message"); | |
1635 return; | |
1636 } | |
1637 } | |
1638 | |
1639 print_method("Optimize finished", 2); | |
1640 } | |
1641 | |
1642 | |
1643 //------------------------------Code_Gen--------------------------------------- | |
1644 // Given a graph, generate code for it | |
1645 void Compile::Code_Gen() { | |
1646 if (failing()) return; | |
1647 | |
1648 // Perform instruction selection. You might think we could reclaim Matcher | |
1649 // memory PDQ, but actually the Matcher is used in generating spill code. | |
1650 // Internals of the Matcher (including some VectorSets) must remain live | |
1651 // for awhile - thus I cannot reclaim Matcher memory lest a VectorSet usage | |
1652 // set a bit in reclaimed memory. | |
1653 | |
1654 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine | |
1655 // nodes. Mapping is only valid at the root of each matched subtree. | |
1656 NOT_PRODUCT( verify_graph_edges(); ) | |
1657 | |
1658 Node_List proj_list; | |
1659 Matcher m(proj_list); | |
1660 _matcher = &m; | |
1661 { | |
1662 TracePhase t2("matcher", &_t_matcher, true); | |
1663 m.match(); | |
1664 } | |
1665 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine | |
1666 // nodes. Mapping is only valid at the root of each matched subtree. | |
1667 NOT_PRODUCT( verify_graph_edges(); ) | |
1668 | |
1669 // If you have too many nodes, or if matching has failed, bail out | |
1670 check_node_count(0, "out of nodes matching instructions"); | |
1671 if (failing()) return; | |
1672 | |
1673 // Build a proper-looking CFG | |
1674 PhaseCFG cfg(node_arena(), root(), m); | |
1675 _cfg = &cfg; | |
1676 { | |
1677 NOT_PRODUCT( TracePhase t2("scheduler", &_t_scheduler, TimeCompiler); ) | |
1678 cfg.Dominators(); | |
1679 if (failing()) return; | |
1680 | |
1681 NOT_PRODUCT( verify_graph_edges(); ) | |
1682 | |
1683 cfg.Estimate_Block_Frequency(); | |
1684 cfg.GlobalCodeMotion(m,unique(),proj_list); | |
1685 | |
1686 print_method("Global code motion", 2); | |
1687 | |
1688 if (failing()) return; | |
1689 NOT_PRODUCT( verify_graph_edges(); ) | |
1690 | |
1691 debug_only( cfg.verify(); ) | |
1692 } | |
1693 NOT_PRODUCT( verify_graph_edges(); ) | |
1694 | |
1695 PhaseChaitin regalloc(unique(),cfg,m); | |
1696 _regalloc = ®alloc; | |
1697 { | |
1698 TracePhase t2("regalloc", &_t_registerAllocation, true); | |
1699 // Perform any platform dependent preallocation actions. This is used, | |
1700 // for example, to avoid taking an implicit null pointer exception | |
1701 // using the frame pointer on win95. | |
1702 _regalloc->pd_preallocate_hook(); | |
1703 | |
1704 // Perform register allocation. After Chaitin, use-def chains are | |
1705 // no longer accurate (at spill code) and so must be ignored. | |
1706 // Node->LRG->reg mappings are still accurate. | |
1707 _regalloc->Register_Allocate(); | |
1708 | |
1709 // Bail out if the allocator builds too many nodes | |
1710 if (failing()) return; | |
1711 } | |
1712 | |
1713 // Prior to register allocation we kept empty basic blocks in case the | |
1714 // the allocator needed a place to spill. After register allocation we | |
1715 // are not adding any new instructions. If any basic block is empty, we | |
1716 // can now safely remove it. | |
1717 { | |
418 | 1718 NOT_PRODUCT( TracePhase t2("blockOrdering", &_t_blockOrdering, TimeCompiler); ) |
1719 cfg.remove_empty(); | |
1720 if (do_freq_based_layout()) { | |
1721 PhaseBlockLayout layout(cfg); | |
1722 } else { | |
1723 cfg.set_loop_alignment(); | |
1724 } | |
1725 cfg.fixup_flow(); | |
0 | 1726 } |
1727 | |
1728 // Perform any platform dependent postallocation verifications. | |
1729 debug_only( _regalloc->pd_postallocate_verify_hook(); ) | |
1730 | |
1731 // Apply peephole optimizations | |
1732 if( OptoPeephole ) { | |
1733 NOT_PRODUCT( TracePhase t2("peephole", &_t_peephole, TimeCompiler); ) | |
1734 PhasePeephole peep( _regalloc, cfg); | |
1735 peep.do_transform(); | |
1736 } | |
1737 | |
1738 // Convert Nodes to instruction bits in a buffer | |
1739 { | |
1740 // %%%% workspace merge brought two timers together for one job | |
1741 TracePhase t2a("output", &_t_output, true); | |
1742 NOT_PRODUCT( TraceTime t2b(NULL, &_t_codeGeneration, TimeCompiler, false); ) | |
1743 Output(); | |
1744 } | |
1745 | |
222 | 1746 print_method("Final Code"); |
0 | 1747 |
1748 // He's dead, Jim. | |
1749 _cfg = (PhaseCFG*)0xdeadbeef; | |
1750 _regalloc = (PhaseChaitin*)0xdeadbeef; | |
1751 } | |
1752 | |
1753 | |
1754 //------------------------------dump_asm--------------------------------------- | |
1755 // Dump formatted assembly | |
1756 #ifndef PRODUCT | |
1757 void Compile::dump_asm(int *pcs, uint pc_limit) { | |
1758 bool cut_short = false; | |
1759 tty->print_cr("#"); | |
1760 tty->print("# "); _tf->dump(); tty->cr(); | |
1761 tty->print_cr("#"); | |
1762 | |
1763 // For all blocks | |
1764 int pc = 0x0; // Program counter | |
1765 char starts_bundle = ' '; | |
1766 _regalloc->dump_frame(); | |
1767 | |
1768 Node *n = NULL; | |
1769 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
1770 if (VMThread::should_terminate()) { cut_short = true; break; } | |
1771 Block *b = _cfg->_blocks[i]; | |
1772 if (b->is_connector() && !Verbose) continue; | |
1773 n = b->_nodes[0]; | |
1774 if (pcs && n->_idx < pc_limit) | |
1775 tty->print("%3.3x ", pcs[n->_idx]); | |
1776 else | |
1777 tty->print(" "); | |
1778 b->dump_head( &_cfg->_bbs ); | |
1779 if (b->is_connector()) { | |
1780 tty->print_cr(" # Empty connector block"); | |
1781 } else if (b->num_preds() == 2 && b->pred(1)->is_CatchProj() && b->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) { | |
1782 tty->print_cr(" # Block is sole successor of call"); | |
1783 } | |
1784 | |
1785 // For all instructions | |
1786 Node *delay = NULL; | |
1787 for( uint j = 0; j<b->_nodes.size(); j++ ) { | |
1788 if (VMThread::should_terminate()) { cut_short = true; break; } | |
1789 n = b->_nodes[j]; | |
1790 if (valid_bundle_info(n)) { | |
1791 Bundle *bundle = node_bundling(n); | |
1792 if (bundle->used_in_unconditional_delay()) { | |
1793 delay = n; | |
1794 continue; | |
1795 } | |
1796 if (bundle->starts_bundle()) | |
1797 starts_bundle = '+'; | |
1798 } | |
1799 | |
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1800 if (WizardMode) n->dump(); |
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1801 |
0 | 1802 if( !n->is_Region() && // Dont print in the Assembly |
1803 !n->is_Phi() && // a few noisely useless nodes | |
1804 !n->is_Proj() && | |
1805 !n->is_MachTemp() && | |
1806 !n->is_Catch() && // Would be nice to print exception table targets | |
1807 !n->is_MergeMem() && // Not very interesting | |
1808 !n->is_top() && // Debug info table constants | |
1809 !(n->is_Con() && !n->is_Mach())// Debug info table constants | |
1810 ) { | |
1811 if (pcs && n->_idx < pc_limit) | |
1812 tty->print("%3.3x", pcs[n->_idx]); | |
1813 else | |
1814 tty->print(" "); | |
1815 tty->print(" %c ", starts_bundle); | |
1816 starts_bundle = ' '; | |
1817 tty->print("\t"); | |
1818 n->format(_regalloc, tty); | |
1819 tty->cr(); | |
1820 } | |
1821 | |
1822 // If we have an instruction with a delay slot, and have seen a delay, | |
1823 // then back up and print it | |
1824 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { | |
1825 assert(delay != NULL, "no unconditional delay instruction"); | |
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1826 if (WizardMode) delay->dump(); |
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1827 |
0 | 1828 if (node_bundling(delay)->starts_bundle()) |
1829 starts_bundle = '+'; | |
1830 if (pcs && n->_idx < pc_limit) | |
1831 tty->print("%3.3x", pcs[n->_idx]); | |
1832 else | |
1833 tty->print(" "); | |
1834 tty->print(" %c ", starts_bundle); | |
1835 starts_bundle = ' '; | |
1836 tty->print("\t"); | |
1837 delay->format(_regalloc, tty); | |
1838 tty->print_cr(""); | |
1839 delay = NULL; | |
1840 } | |
1841 | |
1842 // Dump the exception table as well | |
1843 if( n->is_Catch() && (Verbose || WizardMode) ) { | |
1844 // Print the exception table for this offset | |
1845 _handler_table.print_subtable_for(pc); | |
1846 } | |
1847 } | |
1848 | |
1849 if (pcs && n->_idx < pc_limit) | |
1850 tty->print_cr("%3.3x", pcs[n->_idx]); | |
1851 else | |
1852 tty->print_cr(""); | |
1853 | |
1854 assert(cut_short || delay == NULL, "no unconditional delay branch"); | |
1855 | |
1856 } // End of per-block dump | |
1857 tty->print_cr(""); | |
1858 | |
1859 if (cut_short) tty->print_cr("*** disassembly is cut short ***"); | |
1860 } | |
1861 #endif | |
1862 | |
1863 //------------------------------Final_Reshape_Counts--------------------------- | |
1864 // This class defines counters to help identify when a method | |
1865 // may/must be executed using hardware with only 24-bit precision. | |
1866 struct Final_Reshape_Counts : public StackObj { | |
1867 int _call_count; // count non-inlined 'common' calls | |
1868 int _float_count; // count float ops requiring 24-bit precision | |
1869 int _double_count; // count double ops requiring more precision | |
1870 int _java_call_count; // count non-inlined 'java' calls | |
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1871 int _inner_loop_count; // count loops which need alignment |
0 | 1872 VectorSet _visited; // Visitation flags |
1873 Node_List _tests; // Set of IfNodes & PCTableNodes | |
1874 | |
1875 Final_Reshape_Counts() : | |
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1876 _call_count(0), _float_count(0), _double_count(0), |
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1877 _java_call_count(0), _inner_loop_count(0), |
0 | 1878 _visited( Thread::current()->resource_area() ) { } |
1879 | |
1880 void inc_call_count () { _call_count ++; } | |
1881 void inc_float_count () { _float_count ++; } | |
1882 void inc_double_count() { _double_count++; } | |
1883 void inc_java_call_count() { _java_call_count++; } | |
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1884 void inc_inner_loop_count() { _inner_loop_count++; } |
0 | 1885 |
1886 int get_call_count () const { return _call_count ; } | |
1887 int get_float_count () const { return _float_count ; } | |
1888 int get_double_count() const { return _double_count; } | |
1889 int get_java_call_count() const { return _java_call_count; } | |
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1890 int get_inner_loop_count() const { return _inner_loop_count; } |
0 | 1891 }; |
1892 | |
1893 static bool oop_offset_is_sane(const TypeInstPtr* tp) { | |
1894 ciInstanceKlass *k = tp->klass()->as_instance_klass(); | |
1895 // Make sure the offset goes inside the instance layout. | |
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1896 return k->contains_field_offset(tp->offset()); |
0 | 1897 // Note that OffsetBot and OffsetTop are very negative. |
1898 } | |
1899 | |
1900 //------------------------------final_graph_reshaping_impl---------------------- | |
1901 // Implement items 1-5 from final_graph_reshaping below. | |
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1902 static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) { |
0 | 1903 |
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1904 if ( n->outcnt() == 0 ) return; // dead node |
0 | 1905 uint nop = n->Opcode(); |
1906 | |
1907 // Check for 2-input instruction with "last use" on right input. | |
1908 // Swap to left input. Implements item (2). | |
1909 if( n->req() == 3 && // two-input instruction | |
1910 n->in(1)->outcnt() > 1 && // left use is NOT a last use | |
1911 (!n->in(1)->is_Phi() || n->in(1)->in(2) != n) && // it is not data loop | |
1912 n->in(2)->outcnt() == 1 &&// right use IS a last use | |
1913 !n->in(2)->is_Con() ) { // right use is not a constant | |
1914 // Check for commutative opcode | |
1915 switch( nop ) { | |
1916 case Op_AddI: case Op_AddF: case Op_AddD: case Op_AddL: | |
1917 case Op_MaxI: case Op_MinI: | |
1918 case Op_MulI: case Op_MulF: case Op_MulD: case Op_MulL: | |
1919 case Op_AndL: case Op_XorL: case Op_OrL: | |
1920 case Op_AndI: case Op_XorI: case Op_OrI: { | |
1921 // Move "last use" input to left by swapping inputs | |
1922 n->swap_edges(1, 2); | |
1923 break; | |
1924 } | |
1925 default: | |
1926 break; | |
1927 } | |
1928 } | |
1929 | |
1930 // Count FPU ops and common calls, implements item (3) | |
1931 switch( nop ) { | |
1932 // Count all float operations that may use FPU | |
1933 case Op_AddF: | |
1934 case Op_SubF: | |
1935 case Op_MulF: | |
1936 case Op_DivF: | |
1937 case Op_NegF: | |
1938 case Op_ModF: | |
1939 case Op_ConvI2F: | |
1940 case Op_ConF: | |
1941 case Op_CmpF: | |
1942 case Op_CmpF3: | |
1943 // case Op_ConvL2F: // longs are split into 32-bit halves | |
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1944 frc.inc_float_count(); |
0 | 1945 break; |
1946 | |
1947 case Op_ConvF2D: | |
1948 case Op_ConvD2F: | |
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1949 frc.inc_float_count(); |
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1950 frc.inc_double_count(); |
0 | 1951 break; |
1952 | |
1953 // Count all double operations that may use FPU | |
1954 case Op_AddD: | |
1955 case Op_SubD: | |
1956 case Op_MulD: | |
1957 case Op_DivD: | |
1958 case Op_NegD: | |
1959 case Op_ModD: | |
1960 case Op_ConvI2D: | |
1961 case Op_ConvD2I: | |
1962 // case Op_ConvL2D: // handled by leaf call | |
1963 // case Op_ConvD2L: // handled by leaf call | |
1964 case Op_ConD: | |
1965 case Op_CmpD: | |
1966 case Op_CmpD3: | |
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1967 frc.inc_double_count(); |
0 | 1968 break; |
1969 case Op_Opaque1: // Remove Opaque Nodes before matching | |
1970 case Op_Opaque2: // Remove Opaque Nodes before matching | |
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1971 n->subsume_by(n->in(1)); |
0 | 1972 break; |
1973 case Op_CallStaticJava: | |
1974 case Op_CallJava: | |
1975 case Op_CallDynamicJava: | |
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1976 frc.inc_java_call_count(); // Count java call site; |
0 | 1977 case Op_CallRuntime: |
1978 case Op_CallLeaf: | |
1979 case Op_CallLeafNoFP: { | |
1980 assert( n->is_Call(), "" ); | |
1981 CallNode *call = n->as_Call(); | |
1982 // Count call sites where the FP mode bit would have to be flipped. | |
1983 // Do not count uncommon runtime calls: | |
1984 // uncommon_trap, _complete_monitor_locking, _complete_monitor_unlocking, | |
1985 // _new_Java, _new_typeArray, _new_objArray, _rethrow_Java, ... | |
1986 if( !call->is_CallStaticJava() || !call->as_CallStaticJava()->_name ) { | |
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1987 frc.inc_call_count(); // Count the call site |
0 | 1988 } else { // See if uncommon argument is shared |
1989 Node *n = call->in(TypeFunc::Parms); | |
1990 int nop = n->Opcode(); | |
1991 // Clone shared simple arguments to uncommon calls, item (1). | |
1992 if( n->outcnt() > 1 && | |
1993 !n->is_Proj() && | |
1994 nop != Op_CreateEx && | |
1995 nop != Op_CheckCastPP && | |
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1996 nop != Op_DecodeN && |
0 | 1997 !n->is_Mem() ) { |
1998 Node *x = n->clone(); | |
1999 call->set_req( TypeFunc::Parms, x ); | |
2000 } | |
2001 } | |
2002 break; | |
2003 } | |
2004 | |
2005 case Op_StoreD: | |
2006 case Op_LoadD: | |
2007 case Op_LoadD_unaligned: | |
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2008 frc.inc_double_count(); |
0 | 2009 goto handle_mem; |
2010 case Op_StoreF: | |
2011 case Op_LoadF: | |
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2012 frc.inc_float_count(); |
0 | 2013 goto handle_mem; |
2014 | |
2015 case Op_StoreB: | |
2016 case Op_StoreC: | |
2017 case Op_StoreCM: | |
2018 case Op_StorePConditional: | |
2019 case Op_StoreI: | |
2020 case Op_StoreL: | |
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2021 case Op_StoreIConditional: |
0 | 2022 case Op_StoreLConditional: |
2023 case Op_CompareAndSwapI: | |
2024 case Op_CompareAndSwapL: | |
2025 case Op_CompareAndSwapP: | |
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2026 case Op_CompareAndSwapN: |
0 | 2027 case Op_StoreP: |
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2028 case Op_StoreN: |
0 | 2029 case Op_LoadB: |
624 | 2030 case Op_LoadUB: |
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2031 case Op_LoadUS: |
0 | 2032 case Op_LoadI: |
624 | 2033 case Op_LoadUI2L: |
0 | 2034 case Op_LoadKlass: |
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2035 case Op_LoadNKlass: |
0 | 2036 case Op_LoadL: |
2037 case Op_LoadL_unaligned: | |
2038 case Op_LoadPLocked: | |
2039 case Op_LoadLLocked: | |
2040 case Op_LoadP: | |
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2041 case Op_LoadN: |
0 | 2042 case Op_LoadRange: |
2043 case Op_LoadS: { | |
2044 handle_mem: | |
2045 #ifdef ASSERT | |
2046 if( VerifyOptoOopOffsets ) { | |
2047 assert( n->is_Mem(), "" ); | |
2048 MemNode *mem = (MemNode*)n; | |
2049 // Check to see if address types have grounded out somehow. | |
2050 const TypeInstPtr *tp = mem->in(MemNode::Address)->bottom_type()->isa_instptr(); | |
2051 assert( !tp || oop_offset_is_sane(tp), "" ); | |
2052 } | |
2053 #endif | |
2054 break; | |
2055 } | |
2056 | |
2057 case Op_AddP: { // Assert sane base pointers | |
182
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2058 Node *addp = n->in(AddPNode::Address); |
0 | 2059 assert( !addp->is_AddP() || |
2060 addp->in(AddPNode::Base)->is_top() || // Top OK for allocation | |
2061 addp->in(AddPNode::Base) == n->in(AddPNode::Base), | |
2062 "Base pointers must match" ); | |
182
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2063 #ifdef _LP64 |
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2064 if (UseCompressedOops && |
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2065 addp->Opcode() == Op_ConP && |
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2066 addp == n->in(AddPNode::Base) && |
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2067 n->in(AddPNode::Offset)->is_Con()) { |
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2068 // Use addressing with narrow klass to load with offset on x86. |
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2069 // On sparc loading 32-bits constant and decoding it have less |
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2070 // instructions (4) then load 64-bits constant (7). |
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2071 // Do this transformation here since IGVN will convert ConN back to ConP. |
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2072 const Type* t = addp->bottom_type(); |
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2073 if (t->isa_oopptr()) { |
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2074 Node* nn = NULL; |
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2075 |
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2076 // Look for existing ConN node of the same exact type. |
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2077 Compile* C = Compile::current(); |
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2078 Node* r = C->root(); |
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2079 uint cnt = r->outcnt(); |
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2080 for (uint i = 0; i < cnt; i++) { |
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2081 Node* m = r->raw_out(i); |
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2082 if (m!= NULL && m->Opcode() == Op_ConN && |
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2083 m->bottom_type()->make_ptr() == t) { |
182
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2084 nn = m; |
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2085 break; |
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2086 } |
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2087 } |
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2088 if (nn != NULL) { |
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2089 // Decode a narrow oop to match address |
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2090 // [R12 + narrow_oop_reg<<3 + offset] |
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2091 nn = new (C, 2) DecodeNNode(nn, t); |
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2092 n->set_req(AddPNode::Base, nn); |
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2093 n->set_req(AddPNode::Address, nn); |
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2094 if (addp->outcnt() == 0) { |
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2095 addp->disconnect_inputs(NULL); |
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2096 } |
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2097 } |
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2098 } |
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2099 } |
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2100 #endif |
0 | 2101 break; |
2102 } | |
2103 | |
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2104 #ifdef _LP64 |
368
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2105 case Op_CastPP: |
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2106 if (n->in(1)->is_DecodeN() && Universe::narrow_oop_use_implicit_null_checks()) { |
368
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2107 Compile* C = Compile::current(); |
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2108 Node* in1 = n->in(1); |
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2109 const Type* t = n->bottom_type(); |
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2110 Node* new_in1 = in1->clone(); |
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2111 new_in1->as_DecodeN()->set_type(t); |
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2112 |
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2113 if (!Matcher::clone_shift_expressions) { |
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2114 // |
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2115 // x86, ARM and friends can handle 2 adds in addressing mode |
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2116 // and Matcher can fold a DecodeN node into address by using |
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2117 // a narrow oop directly and do implicit NULL check in address: |
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2118 // |
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2119 // [R12 + narrow_oop_reg<<3 + offset] |
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2120 // NullCheck narrow_oop_reg |
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2121 // |
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2122 // On other platforms (Sparc) we have to keep new DecodeN node and |
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2123 // use it to do implicit NULL check in address: |
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2124 // |
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2125 // decode_not_null narrow_oop_reg, base_reg |
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|
2126 // [base_reg + offset] |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
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367
diff
changeset
|
2127 // NullCheck base_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
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367
diff
changeset
|
2128 // |
605 | 2129 // Pin the new DecodeN node to non-null path on these platform (Sparc) |
368
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2130 // to keep the information to which NULL check the new DecodeN node |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2131 // corresponds to use it as value in implicit_null_check(). |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2132 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2133 new_in1->set_req(0, n->in(0)); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2134 } |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2135 |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2136 n->subsume_by(new_in1); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2137 if (in1->outcnt() == 0) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2138 in1->disconnect_inputs(NULL); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2139 } |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2140 } |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2141 break; |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2142 |
164
c436414a719e
6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
kvn
parents:
163
diff
changeset
|
2143 case Op_CmpP: |
168
7793bd37a336
6705887: Compressed Oops: generate x64 addressing and implicit null checks with narrow oops
kvn
parents:
164
diff
changeset
|
2144 // Do this transformation here to preserve CmpPNode::sub() and |
7793bd37a336
6705887: Compressed Oops: generate x64 addressing and implicit null checks with narrow oops
kvn
parents:
164
diff
changeset
|
2145 // other TypePtr related Ideal optimizations (for example, ptr nullness). |
331
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2146 if (n->in(1)->is_DecodeN() || n->in(2)->is_DecodeN()) { |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2147 Node* in1 = n->in(1); |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2148 Node* in2 = n->in(2); |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2149 if (!in1->is_DecodeN()) { |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2150 in2 = in1; |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2151 in1 = n->in(2); |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2152 } |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2153 assert(in1->is_DecodeN(), "sanity"); |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2154 |
164
c436414a719e
6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
kvn
parents:
163
diff
changeset
|
2155 Compile* C = Compile::current(); |
331
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2156 Node* new_in2 = NULL; |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2157 if (in2->is_DecodeN()) { |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2158 new_in2 = in2->in(1); |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2159 } else if (in2->Opcode() == Op_ConP) { |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2160 const Type* t = in2->bottom_type(); |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
624
diff
changeset
|
2161 if (t == TypePtr::NULL_PTR && Universe::narrow_oop_use_implicit_null_checks()) { |
368
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2162 new_in2 = ConNode::make(C, TypeNarrowOop::NULL_PTR); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2163 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2164 // This transformation together with CastPP transformation above |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2165 // will generated code for implicit NULL checks for compressed oops. |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2166 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2167 // The original code after Optimize() |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2168 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2169 // LoadN memory, narrow_oop_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2170 // decode narrow_oop_reg, base_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2171 // CmpP base_reg, NULL |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2172 // CastPP base_reg // NotNull |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2173 // Load [base_reg + offset], val_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2174 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2175 // after these transformations will be |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2176 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2177 // LoadN memory, narrow_oop_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2178 // CmpN narrow_oop_reg, NULL |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2179 // decode_not_null narrow_oop_reg, base_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2180 // Load [base_reg + offset], val_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2181 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2182 // and the uncommon path (== NULL) will use narrow_oop_reg directly |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2183 // since narrow oops can be used in debug info now (see the code in |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2184 // final_graph_reshaping_walk()). |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2185 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2186 // At the end the code will be matched to |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2187 // on x86: |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2188 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2189 // Load_narrow_oop memory, narrow_oop_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2190 // Load [R12 + narrow_oop_reg<<3 + offset], val_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2191 // NullCheck narrow_oop_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2192 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2193 // and on sparc: |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2194 // |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2195 // Load_narrow_oop memory, narrow_oop_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2196 // decode_not_null narrow_oop_reg, base_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2197 // Load [base_reg + offset], val_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2198 // NullCheck base_reg |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2199 // |
164
c436414a719e
6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
kvn
parents:
163
diff
changeset
|
2200 } else if (t->isa_oopptr()) { |
331
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2201 new_in2 = ConNode::make(C, t->make_narrowoop()); |
164
c436414a719e
6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
kvn
parents:
163
diff
changeset
|
2202 } |
c436414a719e
6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
kvn
parents:
163
diff
changeset
|
2203 } |
331
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2204 if (new_in2 != NULL) { |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2205 Node* cmpN = new (C, 3) CmpNNode(in1->in(1), new_in2); |
168
7793bd37a336
6705887: Compressed Oops: generate x64 addressing and implicit null checks with narrow oops
kvn
parents:
164
diff
changeset
|
2206 n->subsume_by( cmpN ); |
331
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2207 if (in1->outcnt() == 0) { |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2208 in1->disconnect_inputs(NULL); |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2209 } |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2210 if (in2->outcnt() == 0) { |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2211 in2->disconnect_inputs(NULL); |
cecd8eb4e0ca
6706829: Compressed Oops: add debug info for narrow oops
kvn
parents:
293
diff
changeset
|
2212 } |
164
c436414a719e
6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
kvn
parents:
163
diff
changeset
|
2213 } |
c436414a719e
6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
kvn
parents:
163
diff
changeset
|
2214 } |
293
c3e045194476
6731641: assert(m->adr_type() == mach->adr_type(),"matcher should not change adr type")
kvn
parents:
253
diff
changeset
|
2215 break; |
368
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2216 |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2217 case Op_DecodeN: |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2218 assert(!n->in(1)->is_EncodeP(), "should be optimized out"); |
492
5496e074077f
6787050: assert(n->in(0) == 0L,"no control") with UseCompressedOops on sparcv9
kvn
parents:
490
diff
changeset
|
2219 // DecodeN could be pinned on Sparc where it can't be fold into |
5496e074077f
6787050: assert(n->in(0) == 0L,"no control") with UseCompressedOops on sparcv9
kvn
parents:
490
diff
changeset
|
2220 // an address expression, see the code for Op_CastPP above. |
5496e074077f
6787050: assert(n->in(0) == 0L,"no control") with UseCompressedOops on sparcv9
kvn
parents:
490
diff
changeset
|
2221 assert(n->in(0) == NULL || !Matcher::clone_shift_expressions, "no control except on sparc"); |
368
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2222 break; |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2223 |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2224 case Op_EncodeP: { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2225 Node* in1 = n->in(1); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2226 if (in1->is_DecodeN()) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2227 n->subsume_by(in1->in(1)); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2228 } else if (in1->Opcode() == Op_ConP) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2229 Compile* C = Compile::current(); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2230 const Type* t = in1->bottom_type(); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2231 if (t == TypePtr::NULL_PTR) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2232 n->subsume_by(ConNode::make(C, TypeNarrowOop::NULL_PTR)); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2233 } else if (t->isa_oopptr()) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2234 n->subsume_by(ConNode::make(C, t->make_narrowoop())); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2235 } |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2236 } |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2237 if (in1->outcnt() == 0) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2238 in1->disconnect_inputs(NULL); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2239 } |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2240 break; |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2241 } |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2242 |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2243 case Op_Phi: |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2244 if (n->as_Phi()->bottom_type()->isa_narrowoop()) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2245 // The EncodeP optimization may create Phi with the same edges |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2246 // for all paths. It is not handled well by Register Allocator. |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2247 Node* unique_in = n->in(1); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2248 assert(unique_in != NULL, ""); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2249 uint cnt = n->req(); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2250 for (uint i = 2; i < cnt; i++) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2251 Node* m = n->in(i); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2252 assert(m != NULL, ""); |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2253 if (unique_in != m) |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2254 unique_in = NULL; |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2255 } |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2256 if (unique_in != NULL) { |
36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
kvn
parents:
367
diff
changeset
|
2257 n->subsume_by(unique_in); |
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2258 } |
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2259 } |
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2260 break; |
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2261 |
164
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2262 #endif |
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2263 |
0 | 2264 case Op_ModI: |
2265 if (UseDivMod) { | |
2266 // Check if a%b and a/b both exist | |
2267 Node* d = n->find_similar(Op_DivI); | |
2268 if (d) { | |
2269 // Replace them with a fused divmod if supported | |
2270 Compile* C = Compile::current(); | |
2271 if (Matcher::has_match_rule(Op_DivModI)) { | |
2272 DivModINode* divmod = DivModINode::make(C, n); | |
168
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2273 d->subsume_by(divmod->div_proj()); |
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2274 n->subsume_by(divmod->mod_proj()); |
0 | 2275 } else { |
2276 // replace a%b with a-((a/b)*b) | |
2277 Node* mult = new (C, 3) MulINode(d, d->in(2)); | |
2278 Node* sub = new (C, 3) SubINode(d->in(1), mult); | |
168
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2279 n->subsume_by( sub ); |
0 | 2280 } |
2281 } | |
2282 } | |
2283 break; | |
2284 | |
2285 case Op_ModL: | |
2286 if (UseDivMod) { | |
2287 // Check if a%b and a/b both exist | |
2288 Node* d = n->find_similar(Op_DivL); | |
2289 if (d) { | |
2290 // Replace them with a fused divmod if supported | |
2291 Compile* C = Compile::current(); | |
2292 if (Matcher::has_match_rule(Op_DivModL)) { | |
2293 DivModLNode* divmod = DivModLNode::make(C, n); | |
168
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2294 d->subsume_by(divmod->div_proj()); |
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2295 n->subsume_by(divmod->mod_proj()); |
0 | 2296 } else { |
2297 // replace a%b with a-((a/b)*b) | |
2298 Node* mult = new (C, 3) MulLNode(d, d->in(2)); | |
2299 Node* sub = new (C, 3) SubLNode(d->in(1), mult); | |
168
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2300 n->subsume_by( sub ); |
0 | 2301 } |
2302 } | |
2303 } | |
2304 break; | |
2305 | |
2306 case Op_Load16B: | |
2307 case Op_Load8B: | |
2308 case Op_Load4B: | |
2309 case Op_Load8S: | |
2310 case Op_Load4S: | |
2311 case Op_Load2S: | |
2312 case Op_Load8C: | |
2313 case Op_Load4C: | |
2314 case Op_Load2C: | |
2315 case Op_Load4I: | |
2316 case Op_Load2I: | |
2317 case Op_Load2L: | |
2318 case Op_Load4F: | |
2319 case Op_Load2F: | |
2320 case Op_Load2D: | |
2321 case Op_Store16B: | |
2322 case Op_Store8B: | |
2323 case Op_Store4B: | |
2324 case Op_Store8C: | |
2325 case Op_Store4C: | |
2326 case Op_Store2C: | |
2327 case Op_Store4I: | |
2328 case Op_Store2I: | |
2329 case Op_Store2L: | |
2330 case Op_Store4F: | |
2331 case Op_Store2F: | |
2332 case Op_Store2D: | |
2333 break; | |
2334 | |
2335 case Op_PackB: | |
2336 case Op_PackS: | |
2337 case Op_PackC: | |
2338 case Op_PackI: | |
2339 case Op_PackF: | |
2340 case Op_PackL: | |
2341 case Op_PackD: | |
2342 if (n->req()-1 > 2) { | |
2343 // Replace many operand PackNodes with a binary tree for matching | |
2344 PackNode* p = (PackNode*) n; | |
2345 Node* btp = p->binaryTreePack(Compile::current(), 1, n->req()); | |
168
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2346 n->subsume_by(btp); |
0 | 2347 } |
2348 break; | |
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2349 case Op_Loop: |
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2350 case Op_CountedLoop: |
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2351 if (n->as_Loop()->is_inner_loop()) { |
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2352 frc.inc_inner_loop_count(); |
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2353 } |
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2354 break; |
0 | 2355 default: |
2356 assert( !n->is_Call(), "" ); | |
2357 assert( !n->is_Mem(), "" ); | |
2358 break; | |
2359 } | |
127 | 2360 |
2361 // Collect CFG split points | |
2362 if (n->is_MultiBranch()) | |
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2363 frc._tests.push(n); |
0 | 2364 } |
2365 | |
2366 //------------------------------final_graph_reshaping_walk--------------------- | |
2367 // Replacing Opaque nodes with their input in final_graph_reshaping_impl(), | |
2368 // requires that the walk visits a node's inputs before visiting the node. | |
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2369 static void final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Reshape_Counts &frc ) { |
331
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2370 ResourceArea *area = Thread::current()->resource_area(); |
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2371 Unique_Node_List sfpt(area); |
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2372 |
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2373 frc._visited.set(root->_idx); // first, mark node as visited |
0 | 2374 uint cnt = root->req(); |
2375 Node *n = root; | |
2376 uint i = 0; | |
2377 while (true) { | |
2378 if (i < cnt) { | |
2379 // Place all non-visited non-null inputs onto stack | |
2380 Node* m = n->in(i); | |
2381 ++i; | |
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2382 if (m != NULL && !frc._visited.test_set(m->_idx)) { |
331
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2383 if (m->is_SafePoint() && m->as_SafePoint()->jvms() != NULL) |
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2384 sfpt.push(m); |
0 | 2385 cnt = m->req(); |
2386 nstack.push(n, i); // put on stack parent and next input's index | |
2387 n = m; | |
2388 i = 0; | |
2389 } | |
2390 } else { | |
2391 // Now do post-visit work | |
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2392 final_graph_reshaping_impl( n, frc ); |
0 | 2393 if (nstack.is_empty()) |
2394 break; // finished | |
2395 n = nstack.node(); // Get node from stack | |
2396 cnt = n->req(); | |
2397 i = nstack.index(); | |
2398 nstack.pop(); // Shift to the next node on stack | |
2399 } | |
2400 } | |
331
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2401 |
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2402 // Go over safepoints nodes to skip DecodeN nodes for debug edges. |
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2403 // It could be done for an uncommon traps or any safepoints/calls |
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2404 // if the DecodeN node is referenced only in a debug info. |
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2405 while (sfpt.size() > 0) { |
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2406 n = sfpt.pop(); |
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2407 JVMState *jvms = n->as_SafePoint()->jvms(); |
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2408 assert(jvms != NULL, "sanity"); |
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2409 int start = jvms->debug_start(); |
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2410 int end = n->req(); |
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2411 bool is_uncommon = (n->is_CallStaticJava() && |
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2412 n->as_CallStaticJava()->uncommon_trap_request() != 0); |
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2413 for (int j = start; j < end; j++) { |
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2414 Node* in = n->in(j); |
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2415 if (in->is_DecodeN()) { |
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|
2416 bool safe_to_skip = true; |
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2417 if (!is_uncommon ) { |
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2418 // Is it safe to skip? |
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2419 for (uint i = 0; i < in->outcnt(); i++) { |
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2420 Node* u = in->raw_out(i); |
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2421 if (!u->is_SafePoint() || |
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2422 u->is_Call() && u->as_Call()->has_non_debug_use(n)) { |
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2423 safe_to_skip = false; |
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|
2424 } |
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|
2425 } |
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|
2426 } |
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2427 if (safe_to_skip) { |
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2428 n->set_req(j, in->in(1)); |
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|
2429 } |
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2430 if (in->outcnt() == 0) { |
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2431 in->disconnect_inputs(NULL); |
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|
2432 } |
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|
2433 } |
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|
2434 } |
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|
2435 } |
0 | 2436 } |
2437 | |
2438 //------------------------------final_graph_reshaping-------------------------- | |
2439 // Final Graph Reshaping. | |
2440 // | |
2441 // (1) Clone simple inputs to uncommon calls, so they can be scheduled late | |
2442 // and not commoned up and forced early. Must come after regular | |
2443 // optimizations to avoid GVN undoing the cloning. Clone constant | |
2444 // inputs to Loop Phis; these will be split by the allocator anyways. | |
2445 // Remove Opaque nodes. | |
2446 // (2) Move last-uses by commutative operations to the left input to encourage | |
2447 // Intel update-in-place two-address operations and better register usage | |
2448 // on RISCs. Must come after regular optimizations to avoid GVN Ideal | |
2449 // calls canonicalizing them back. | |
2450 // (3) Count the number of double-precision FP ops, single-precision FP ops | |
2451 // and call sites. On Intel, we can get correct rounding either by | |
2452 // forcing singles to memory (requires extra stores and loads after each | |
2453 // FP bytecode) or we can set a rounding mode bit (requires setting and | |
2454 // clearing the mode bit around call sites). The mode bit is only used | |
2455 // if the relative frequency of single FP ops to calls is low enough. | |
2456 // This is a key transform for SPEC mpeg_audio. | |
2457 // (4) Detect infinite loops; blobs of code reachable from above but not | |
2458 // below. Several of the Code_Gen algorithms fail on such code shapes, | |
2459 // so we simply bail out. Happens a lot in ZKM.jar, but also happens | |
2460 // from time to time in other codes (such as -Xcomp finalizer loops, etc). | |
2461 // Detection is by looking for IfNodes where only 1 projection is | |
2462 // reachable from below or CatchNodes missing some targets. | |
2463 // (5) Assert for insane oop offsets in debug mode. | |
2464 | |
2465 bool Compile::final_graph_reshaping() { | |
2466 // an infinite loop may have been eliminated by the optimizer, | |
2467 // in which case the graph will be empty. | |
2468 if (root()->req() == 1) { | |
2469 record_method_not_compilable("trivial infinite loop"); | |
2470 return true; | |
2471 } | |
2472 | |
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2473 Final_Reshape_Counts frc; |
0 | 2474 |
2475 // Visit everybody reachable! | |
2476 // Allocate stack of size C->unique()/2 to avoid frequent realloc | |
2477 Node_Stack nstack(unique() >> 1); | |
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2478 final_graph_reshaping_walk(nstack, root(), frc); |
0 | 2479 |
2480 // Check for unreachable (from below) code (i.e., infinite loops). | |
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2481 for( uint i = 0; i < frc._tests.size(); i++ ) { |
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2482 MultiBranchNode *n = frc._tests[i]->as_MultiBranch(); |
127 | 2483 // Get number of CFG targets. |
0 | 2484 // Note that PCTables include exception targets after calls. |
127 | 2485 uint required_outcnt = n->required_outcnt(); |
2486 if (n->outcnt() != required_outcnt) { | |
0 | 2487 // Check for a few special cases. Rethrow Nodes never take the |
2488 // 'fall-thru' path, so expected kids is 1 less. | |
2489 if (n->is_PCTable() && n->in(0) && n->in(0)->in(0)) { | |
2490 if (n->in(0)->in(0)->is_Call()) { | |
2491 CallNode *call = n->in(0)->in(0)->as_Call(); | |
2492 if (call->entry_point() == OptoRuntime::rethrow_stub()) { | |
127 | 2493 required_outcnt--; // Rethrow always has 1 less kid |
0 | 2494 } else if (call->req() > TypeFunc::Parms && |
2495 call->is_CallDynamicJava()) { | |
2496 // Check for null receiver. In such case, the optimizer has | |
2497 // detected that the virtual call will always result in a null | |
2498 // pointer exception. The fall-through projection of this CatchNode | |
2499 // will not be populated. | |
2500 Node *arg0 = call->in(TypeFunc::Parms); | |
2501 if (arg0->is_Type() && | |
2502 arg0->as_Type()->type()->higher_equal(TypePtr::NULL_PTR)) { | |
127 | 2503 required_outcnt--; |
0 | 2504 } |
2505 } else if (call->entry_point() == OptoRuntime::new_array_Java() && | |
2506 call->req() > TypeFunc::Parms+1 && | |
2507 call->is_CallStaticJava()) { | |
2508 // Check for negative array length. In such case, the optimizer has | |
2509 // detected that the allocation attempt will always result in an | |
2510 // exception. There is no fall-through projection of this CatchNode . | |
2511 Node *arg1 = call->in(TypeFunc::Parms+1); | |
2512 if (arg1->is_Type() && | |
2513 arg1->as_Type()->type()->join(TypeInt::POS)->empty()) { | |
127 | 2514 required_outcnt--; |
0 | 2515 } |
2516 } | |
2517 } | |
2518 } | |
127 | 2519 // Recheck with a better notion of 'required_outcnt' |
2520 if (n->outcnt() != required_outcnt) { | |
0 | 2521 record_method_not_compilable("malformed control flow"); |
2522 return true; // Not all targets reachable! | |
2523 } | |
2524 } | |
2525 // Check that I actually visited all kids. Unreached kids | |
2526 // must be infinite loops. | |
2527 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) | |
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2528 if (!frc._visited.test(n->fast_out(j)->_idx)) { |
0 | 2529 record_method_not_compilable("infinite loop"); |
2530 return true; // Found unvisited kid; must be unreach | |
2531 } | |
2532 } | |
2533 | |
2534 // If original bytecodes contained a mixture of floats and doubles | |
2535 // check if the optimizer has made it homogenous, item (3). | |
929
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2536 if( Use24BitFPMode && Use24BitFP && UseSSE == 0 && |
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2537 frc.get_float_count() > 32 && |
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2538 frc.get_double_count() == 0 && |
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|
2539 (10 * frc.get_call_count() < frc.get_float_count()) ) { |
0 | 2540 set_24_bit_selection_and_mode( false, true ); |
2541 } | |
2542 | |
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2543 set_java_calls(frc.get_java_call_count()); |
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2544 set_inner_loops(frc.get_inner_loop_count()); |
0 | 2545 |
2546 // No infinite loops, no reason to bail out. | |
2547 return false; | |
2548 } | |
2549 | |
2550 //-----------------------------too_many_traps---------------------------------- | |
2551 // Report if there are too many traps at the current method and bci. | |
2552 // Return true if there was a trap, and/or PerMethodTrapLimit is exceeded. | |
2553 bool Compile::too_many_traps(ciMethod* method, | |
2554 int bci, | |
2555 Deoptimization::DeoptReason reason) { | |
2556 ciMethodData* md = method->method_data(); | |
2557 if (md->is_empty()) { | |
2558 // Assume the trap has not occurred, or that it occurred only | |
2559 // because of a transient condition during start-up in the interpreter. | |
2560 return false; | |
2561 } | |
2562 if (md->has_trap_at(bci, reason) != 0) { | |
2563 // Assume PerBytecodeTrapLimit==0, for a more conservative heuristic. | |
2564 // Also, if there are multiple reasons, or if there is no per-BCI record, | |
2565 // assume the worst. | |
2566 if (log()) | |
2567 log()->elem("observe trap='%s' count='%d'", | |
2568 Deoptimization::trap_reason_name(reason), | |
2569 md->trap_count(reason)); | |
2570 return true; | |
2571 } else { | |
2572 // Ignore method/bci and see if there have been too many globally. | |
2573 return too_many_traps(reason, md); | |
2574 } | |
2575 } | |
2576 | |
2577 // Less-accurate variant which does not require a method and bci. | |
2578 bool Compile::too_many_traps(Deoptimization::DeoptReason reason, | |
2579 ciMethodData* logmd) { | |
2580 if (trap_count(reason) >= (uint)PerMethodTrapLimit) { | |
2581 // Too many traps globally. | |
2582 // Note that we use cumulative trap_count, not just md->trap_count. | |
2583 if (log()) { | |
2584 int mcount = (logmd == NULL)? -1: (int)logmd->trap_count(reason); | |
2585 log()->elem("observe trap='%s' count='0' mcount='%d' ccount='%d'", | |
2586 Deoptimization::trap_reason_name(reason), | |
2587 mcount, trap_count(reason)); | |
2588 } | |
2589 return true; | |
2590 } else { | |
2591 // The coast is clear. | |
2592 return false; | |
2593 } | |
2594 } | |
2595 | |
2596 //--------------------------too_many_recompiles-------------------------------- | |
2597 // Report if there are too many recompiles at the current method and bci. | |
2598 // Consults PerBytecodeRecompilationCutoff and PerMethodRecompilationCutoff. | |
2599 // Is not eager to return true, since this will cause the compiler to use | |
2600 // Action_none for a trap point, to avoid too many recompilations. | |
2601 bool Compile::too_many_recompiles(ciMethod* method, | |
2602 int bci, | |
2603 Deoptimization::DeoptReason reason) { | |
2604 ciMethodData* md = method->method_data(); | |
2605 if (md->is_empty()) { | |
2606 // Assume the trap has not occurred, or that it occurred only | |
2607 // because of a transient condition during start-up in the interpreter. | |
2608 return false; | |
2609 } | |
2610 // Pick a cutoff point well within PerBytecodeRecompilationCutoff. | |
2611 uint bc_cutoff = (uint) PerBytecodeRecompilationCutoff / 8; | |
2612 uint m_cutoff = (uint) PerMethodRecompilationCutoff / 2 + 1; // not zero | |
2613 Deoptimization::DeoptReason per_bc_reason | |
2614 = Deoptimization::reason_recorded_per_bytecode_if_any(reason); | |
2615 if ((per_bc_reason == Deoptimization::Reason_none | |
2616 || md->has_trap_at(bci, reason) != 0) | |
2617 // The trap frequency measure we care about is the recompile count: | |
2618 && md->trap_recompiled_at(bci) | |
2619 && md->overflow_recompile_count() >= bc_cutoff) { | |
2620 // Do not emit a trap here if it has already caused recompilations. | |
2621 // Also, if there are multiple reasons, or if there is no per-BCI record, | |
2622 // assume the worst. | |
2623 if (log()) | |
2624 log()->elem("observe trap='%s recompiled' count='%d' recompiles2='%d'", | |
2625 Deoptimization::trap_reason_name(reason), | |
2626 md->trap_count(reason), | |
2627 md->overflow_recompile_count()); | |
2628 return true; | |
2629 } else if (trap_count(reason) != 0 | |
2630 && decompile_count() >= m_cutoff) { | |
2631 // Too many recompiles globally, and we have seen this sort of trap. | |
2632 // Use cumulative decompile_count, not just md->decompile_count. | |
2633 if (log()) | |
2634 log()->elem("observe trap='%s' count='%d' mcount='%d' decompiles='%d' mdecompiles='%d'", | |
2635 Deoptimization::trap_reason_name(reason), | |
2636 md->trap_count(reason), trap_count(reason), | |
2637 md->decompile_count(), decompile_count()); | |
2638 return true; | |
2639 } else { | |
2640 // The coast is clear. | |
2641 return false; | |
2642 } | |
2643 } | |
2644 | |
2645 | |
2646 #ifndef PRODUCT | |
2647 //------------------------------verify_graph_edges--------------------------- | |
2648 // Walk the Graph and verify that there is a one-to-one correspondence | |
2649 // between Use-Def edges and Def-Use edges in the graph. | |
2650 void Compile::verify_graph_edges(bool no_dead_code) { | |
2651 if (VerifyGraphEdges) { | |
2652 ResourceArea *area = Thread::current()->resource_area(); | |
2653 Unique_Node_List visited(area); | |
2654 // Call recursive graph walk to check edges | |
2655 _root->verify_edges(visited); | |
2656 if (no_dead_code) { | |
2657 // Now make sure that no visited node is used by an unvisited node. | |
2658 bool dead_nodes = 0; | |
2659 Unique_Node_List checked(area); | |
2660 while (visited.size() > 0) { | |
2661 Node* n = visited.pop(); | |
2662 checked.push(n); | |
2663 for (uint i = 0; i < n->outcnt(); i++) { | |
2664 Node* use = n->raw_out(i); | |
2665 if (checked.member(use)) continue; // already checked | |
2666 if (visited.member(use)) continue; // already in the graph | |
2667 if (use->is_Con()) continue; // a dead ConNode is OK | |
2668 // At this point, we have found a dead node which is DU-reachable. | |
2669 if (dead_nodes++ == 0) | |
2670 tty->print_cr("*** Dead nodes reachable via DU edges:"); | |
2671 use->dump(2); | |
2672 tty->print_cr("---"); | |
2673 checked.push(use); // No repeats; pretend it is now checked. | |
2674 } | |
2675 } | |
2676 assert(dead_nodes == 0, "using nodes must be reachable from root"); | |
2677 } | |
2678 } | |
2679 } | |
2680 #endif | |
2681 | |
2682 // The Compile object keeps track of failure reasons separately from the ciEnv. | |
2683 // This is required because there is not quite a 1-1 relation between the | |
2684 // ciEnv and its compilation task and the Compile object. Note that one | |
2685 // ciEnv might use two Compile objects, if C2Compiler::compile_method decides | |
2686 // to backtrack and retry without subsuming loads. Other than this backtracking | |
2687 // behavior, the Compile's failure reason is quietly copied up to the ciEnv | |
2688 // by the logic in C2Compiler. | |
2689 void Compile::record_failure(const char* reason) { | |
2690 if (log() != NULL) { | |
2691 log()->elem("failure reason='%s' phase='compile'", reason); | |
2692 } | |
2693 if (_failure_reason == NULL) { | |
2694 // Record the first failure reason. | |
2695 _failure_reason = reason; | |
2696 } | |
222 | 2697 if (!C->failure_reason_is(C2Compiler::retry_no_subsuming_loads())) { |
2698 C->print_method(_failure_reason); | |
2699 } | |
0 | 2700 _root = NULL; // flush the graph, too |
2701 } | |
2702 | |
2703 Compile::TracePhase::TracePhase(const char* name, elapsedTimer* accumulator, bool dolog) | |
2704 : TraceTime(NULL, accumulator, false NOT_PRODUCT( || TimeCompiler ), false) | |
2705 { | |
2706 if (dolog) { | |
2707 C = Compile::current(); | |
2708 _log = C->log(); | |
2709 } else { | |
2710 C = NULL; | |
2711 _log = NULL; | |
2712 } | |
2713 if (_log != NULL) { | |
2714 _log->begin_head("phase name='%s' nodes='%d'", name, C->unique()); | |
2715 _log->stamp(); | |
2716 _log->end_head(); | |
2717 } | |
2718 } | |
2719 | |
2720 Compile::TracePhase::~TracePhase() { | |
2721 if (_log != NULL) { | |
2722 _log->done("phase nodes='%d'", C->unique()); | |
2723 } | |
2724 } |