Mercurial > hg > truffle
annotate src/share/vm/opto/output.cpp @ 2645:b2c1e959be46
Clean up around BlockBegin / StdEntry.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 14:34:29 +0200 |
parents | 1d1603768966 |
children | 92add02409c9 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "asm/assembler.inline.hpp" | |
27 #include "code/debugInfo.hpp" | |
28 #include "code/debugInfoRec.hpp" | |
29 #include "compiler/compileBroker.hpp" | |
30 #include "compiler/oopMap.hpp" | |
31 #include "memory/allocation.inline.hpp" | |
32 #include "opto/callnode.hpp" | |
33 #include "opto/cfgnode.hpp" | |
34 #include "opto/locknode.hpp" | |
35 #include "opto/machnode.hpp" | |
36 #include "opto/output.hpp" | |
37 #include "opto/regalloc.hpp" | |
38 #include "opto/runtime.hpp" | |
39 #include "opto/subnode.hpp" | |
40 #include "opto/type.hpp" | |
41 #include "runtime/handles.inline.hpp" | |
42 #include "utilities/xmlstream.hpp" | |
0 | 43 |
44 extern uint size_java_to_interp(); | |
45 extern uint reloc_java_to_interp(); | |
46 extern uint size_exception_handler(); | |
47 extern uint size_deopt_handler(); | |
48 | |
49 #ifndef PRODUCT | |
50 #define DEBUG_ARG(x) , x | |
51 #else | |
52 #define DEBUG_ARG(x) | |
53 #endif | |
54 | |
55 extern int emit_exception_handler(CodeBuffer &cbuf); | |
56 extern int emit_deopt_handler(CodeBuffer &cbuf); | |
57 | |
58 //------------------------------Output----------------------------------------- | |
59 // Convert Nodes to instruction bits and pass off to the VM | |
60 void Compile::Output() { | |
61 // RootNode goes | |
62 assert( _cfg->_broot->_nodes.size() == 0, "" ); | |
63 | |
859
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64 // The number of new nodes (mostly MachNop) is proportional to |
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65 // the number of java calls and inner loops which are aligned. |
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66 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 + |
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67 C->inner_loops()*(OptoLoopAlignment-1)), |
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68 "out of nodes before code generation" ) ) { |
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69 return; |
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70 } |
0 | 71 // Make sure I can find the Start Node |
72 Block_Array& bbs = _cfg->_bbs; | |
73 Block *entry = _cfg->_blocks[1]; | |
74 Block *broot = _cfg->_broot; | |
75 | |
76 const StartNode *start = entry->_nodes[0]->as_Start(); | |
77 | |
78 // Replace StartNode with prolog | |
79 MachPrologNode *prolog = new (this) MachPrologNode(); | |
80 entry->_nodes.map( 0, prolog ); | |
81 bbs.map( prolog->_idx, entry ); | |
82 bbs.map( start->_idx, NULL ); // start is no longer in any block | |
83 | |
84 // Virtual methods need an unverified entry point | |
85 | |
86 if( is_osr_compilation() ) { | |
87 if( PoisonOSREntry ) { | |
88 // TODO: Should use a ShouldNotReachHereNode... | |
89 _cfg->insert( broot, 0, new (this) MachBreakpointNode() ); | |
90 } | |
91 } else { | |
92 if( _method && !_method->flags().is_static() ) { | |
93 // Insert unvalidated entry point | |
94 _cfg->insert( broot, 0, new (this) MachUEPNode() ); | |
95 } | |
96 | |
97 } | |
98 | |
99 | |
100 // Break before main entry point | |
101 if( (_method && _method->break_at_execute()) | |
102 #ifndef PRODUCT | |
103 ||(OptoBreakpoint && is_method_compilation()) | |
104 ||(OptoBreakpointOSR && is_osr_compilation()) | |
105 ||(OptoBreakpointC2R && !_method) | |
106 #endif | |
107 ) { | |
108 // checking for _method means that OptoBreakpoint does not apply to | |
109 // runtime stubs or frame converters | |
110 _cfg->insert( entry, 1, new (this) MachBreakpointNode() ); | |
111 } | |
112 | |
113 // Insert epilogs before every return | |
114 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
115 Block *b = _cfg->_blocks[i]; | |
116 if( !b->is_connector() && b->non_connector_successor(0) == _cfg->_broot ) { // Found a program exit point? | |
117 Node *m = b->end(); | |
118 if( m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt ) { | |
119 MachEpilogNode *epilog = new (this) MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return); | |
120 b->add_inst( epilog ); | |
121 bbs.map(epilog->_idx, b); | |
122 //_regalloc->set_bad(epilog->_idx); // Already initialized this way. | |
123 } | |
124 } | |
125 } | |
126 | |
127 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
128 if ( ZapDeadCompiledLocals ) Insert_zap_nodes(); | |
129 # endif | |
130 | |
131 ScheduleAndBundle(); | |
132 | |
133 #ifndef PRODUCT | |
134 if (trace_opto_output()) { | |
135 tty->print("\n---- After ScheduleAndBundle ----\n"); | |
136 for (uint i = 0; i < _cfg->_num_blocks; i++) { | |
137 tty->print("\nBB#%03d:\n", i); | |
138 Block *bb = _cfg->_blocks[i]; | |
139 for (uint j = 0; j < bb->_nodes.size(); j++) { | |
140 Node *n = bb->_nodes[j]; | |
141 OptoReg::Name reg = _regalloc->get_reg_first(n); | |
142 tty->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : ""); | |
143 n->dump(); | |
144 } | |
145 } | |
146 } | |
147 #endif | |
148 | |
149 if (failing()) return; | |
150 | |
151 BuildOopMaps(); | |
152 | |
153 if (failing()) return; | |
154 | |
155 Fill_buffer(); | |
156 } | |
157 | |
158 bool Compile::need_stack_bang(int frame_size_in_bytes) const { | |
159 // Determine if we need to generate a stack overflow check. | |
160 // Do it if the method is not a stub function and | |
161 // has java calls or has frame size > vm_page_size/8. | |
162 return (stub_function() == NULL && | |
163 (has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3)); | |
164 } | |
165 | |
166 bool Compile::need_register_stack_bang() const { | |
167 // Determine if we need to generate a register stack overflow check. | |
168 // This is only used on architectures which have split register | |
169 // and memory stacks (ie. IA64). | |
170 // Bang if the method is not a stub function and has java calls | |
171 return (stub_function() == NULL && has_java_calls()); | |
172 } | |
173 | |
174 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
175 | |
176 | |
177 // In order to catch compiler oop-map bugs, we have implemented | |
178 // a debugging mode called ZapDeadCompilerLocals. | |
179 // This mode causes the compiler to insert a call to a runtime routine, | |
180 // "zap_dead_locals", right before each place in compiled code | |
181 // that could potentially be a gc-point (i.e., a safepoint or oop map point). | |
182 // The runtime routine checks that locations mapped as oops are really | |
183 // oops, that locations mapped as values do not look like oops, | |
184 // and that locations mapped as dead are not used later | |
185 // (by zapping them to an invalid address). | |
186 | |
187 int Compile::_CompiledZap_count = 0; | |
188 | |
189 void Compile::Insert_zap_nodes() { | |
190 bool skip = false; | |
191 | |
192 | |
193 // Dink with static counts because code code without the extra | |
194 // runtime calls is MUCH faster for debugging purposes | |
195 | |
196 if ( CompileZapFirst == 0 ) ; // nothing special | |
197 else if ( CompileZapFirst > CompiledZap_count() ) skip = true; | |
198 else if ( CompileZapFirst == CompiledZap_count() ) | |
199 warning("starting zap compilation after skipping"); | |
200 | |
201 if ( CompileZapLast == -1 ) ; // nothing special | |
202 else if ( CompileZapLast < CompiledZap_count() ) skip = true; | |
203 else if ( CompileZapLast == CompiledZap_count() ) | |
204 warning("about to compile last zap"); | |
205 | |
206 ++_CompiledZap_count; // counts skipped zaps, too | |
207 | |
208 if ( skip ) return; | |
209 | |
210 | |
211 if ( _method == NULL ) | |
212 return; // no safepoints/oopmaps emitted for calls in stubs,so we don't care | |
213 | |
214 // Insert call to zap runtime stub before every node with an oop map | |
215 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
216 Block *b = _cfg->_blocks[i]; | |
217 for ( uint j = 0; j < b->_nodes.size(); ++j ) { | |
218 Node *n = b->_nodes[j]; | |
219 | |
220 // Determining if we should insert a zap-a-lot node in output. | |
221 // We do that for all nodes that has oopmap info, except for calls | |
222 // to allocation. Calls to allocation passes in the old top-of-eden pointer | |
223 // and expect the C code to reset it. Hence, there can be no safepoints between | |
224 // the inlined-allocation and the call to new_Java, etc. | |
225 // We also cannot zap monitor calls, as they must hold the microlock | |
226 // during the call to Zap, which also wants to grab the microlock. | |
227 bool insert = n->is_MachSafePoint() && (n->as_MachSafePoint()->oop_map() != NULL); | |
228 if ( insert ) { // it is MachSafePoint | |
229 if ( !n->is_MachCall() ) { | |
230 insert = false; | |
231 } else if ( n->is_MachCall() ) { | |
232 MachCallNode* call = n->as_MachCall(); | |
233 if (call->entry_point() == OptoRuntime::new_instance_Java() || | |
234 call->entry_point() == OptoRuntime::new_array_Java() || | |
235 call->entry_point() == OptoRuntime::multianewarray2_Java() || | |
236 call->entry_point() == OptoRuntime::multianewarray3_Java() || | |
237 call->entry_point() == OptoRuntime::multianewarray4_Java() || | |
238 call->entry_point() == OptoRuntime::multianewarray5_Java() || | |
239 call->entry_point() == OptoRuntime::slow_arraycopy_Java() || | |
240 call->entry_point() == OptoRuntime::complete_monitor_locking_Java() | |
241 ) { | |
242 insert = false; | |
243 } | |
244 } | |
245 if (insert) { | |
246 Node *zap = call_zap_node(n->as_MachSafePoint(), i); | |
247 b->_nodes.insert( j, zap ); | |
248 _cfg->_bbs.map( zap->_idx, b ); | |
249 ++j; | |
250 } | |
251 } | |
252 } | |
253 } | |
254 } | |
255 | |
256 | |
257 Node* Compile::call_zap_node(MachSafePointNode* node_to_check, int block_no) { | |
258 const TypeFunc *tf = OptoRuntime::zap_dead_locals_Type(); | |
259 CallStaticJavaNode* ideal_node = | |
260 new (this, tf->domain()->cnt()) CallStaticJavaNode( tf, | |
261 OptoRuntime::zap_dead_locals_stub(_method->flags().is_native()), | |
262 "call zap dead locals stub", 0, TypePtr::BOTTOM); | |
263 // We need to copy the OopMap from the site we're zapping at. | |
264 // We have to make a copy, because the zap site might not be | |
265 // a call site, and zap_dead is a call site. | |
266 OopMap* clone = node_to_check->oop_map()->deep_copy(); | |
267 | |
268 // Add the cloned OopMap to the zap node | |
269 ideal_node->set_oop_map(clone); | |
270 return _matcher->match_sfpt(ideal_node); | |
271 } | |
272 | |
273 //------------------------------is_node_getting_a_safepoint-------------------- | |
274 bool Compile::is_node_getting_a_safepoint( Node* n) { | |
275 // This code duplicates the logic prior to the call of add_safepoint | |
276 // below in this file. | |
277 if( n->is_MachSafePoint() ) return true; | |
278 return false; | |
279 } | |
280 | |
281 # endif // ENABLE_ZAP_DEAD_LOCALS | |
282 | |
283 //------------------------------compute_loop_first_inst_sizes------------------ | |
418 | 284 // Compute the size of first NumberOfLoopInstrToAlign instructions at the top |
0 | 285 // of a loop. When aligning a loop we need to provide enough instructions |
286 // in cpu's fetch buffer to feed decoders. The loop alignment could be | |
287 // avoided if we have enough instructions in fetch buffer at the head of a loop. | |
288 // By default, the size is set to 999999 by Block's constructor so that | |
289 // a loop will be aligned if the size is not reset here. | |
290 // | |
291 // Note: Mach instructions could contain several HW instructions | |
292 // so the size is estimated only. | |
293 // | |
294 void Compile::compute_loop_first_inst_sizes() { | |
295 // The next condition is used to gate the loop alignment optimization. | |
296 // Don't aligned a loop if there are enough instructions at the head of a loop | |
297 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad | |
298 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is | |
299 // equal to 11 bytes which is the largest address NOP instruction. | |
300 if( MaxLoopPad < OptoLoopAlignment-1 ) { | |
301 uint last_block = _cfg->_num_blocks-1; | |
302 for( uint i=1; i <= last_block; i++ ) { | |
303 Block *b = _cfg->_blocks[i]; | |
304 // Check the first loop's block which requires an alignment. | |
418 | 305 if( b->loop_alignment() > (uint)relocInfo::addr_unit() ) { |
0 | 306 uint sum_size = 0; |
307 uint inst_cnt = NumberOfLoopInstrToAlign; | |
418 | 308 inst_cnt = b->compute_first_inst_size(sum_size, inst_cnt, _regalloc); |
309 | |
310 // Check subsequent fallthrough blocks if the loop's first | |
311 // block(s) does not have enough instructions. | |
312 Block *nb = b; | |
313 while( inst_cnt > 0 && | |
314 i < last_block && | |
315 !_cfg->_blocks[i+1]->has_loop_alignment() && | |
316 !nb->has_successor(b) ) { | |
317 i++; | |
318 nb = _cfg->_blocks[i]; | |
319 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, _regalloc); | |
320 } // while( inst_cnt > 0 && i < last_block ) | |
321 | |
0 | 322 b->set_first_inst_size(sum_size); |
323 } // f( b->head()->is_Loop() ) | |
324 } // for( i <= last_block ) | |
325 } // if( MaxLoopPad < OptoLoopAlignment-1 ) | |
326 } | |
327 | |
328 //----------------------Shorten_branches--------------------------------------- | |
329 // The architecture description provides short branch variants for some long | |
330 // branch instructions. Replace eligible long branches with short branches. | |
2008 | 331 void Compile::Shorten_branches(Label *labels, int& code_size, int& reloc_size, int& stub_size) { |
0 | 332 |
333 // fill in the nop array for bundling computations | |
334 MachNode *_nop_list[Bundle::_nop_count]; | |
335 Bundle::initialize_nops(_nop_list, this); | |
336 | |
337 // ------------------ | |
338 // Compute size of each block, method size, and relocation information size | |
339 uint *jmp_end = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks); | |
340 uint *blk_starts = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks+1); | |
341 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks); ) | |
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342 DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks); ) |
0 | 343 blk_starts[0] = 0; |
344 | |
345 // Initialize the sizes to 0 | |
346 code_size = 0; // Size in bytes of generated code | |
347 stub_size = 0; // Size in bytes of all stub entries | |
348 // Size in bytes of all relocation entries, including those in local stubs. | |
349 // Start with 2-bytes of reloc info for the unvalidated entry point | |
350 reloc_size = 1; // Number of relocation entries | |
351 | |
352 // Make three passes. The first computes pessimistic blk_starts, | |
2008 | 353 // relative jmp_end and reloc_size information. The second performs |
354 // short branch substitution using the pessimistic sizing. The | |
355 // third inserts nops where needed. | |
0 | 356 |
357 Node *nj; // tmp | |
358 | |
359 // Step one, perform a pessimistic sizing pass. | |
360 uint i; | |
361 uint min_offset_from_last_call = 1; // init to a positive value | |
362 uint nop_size = (new (this) MachNopNode())->size(_regalloc); | |
363 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
364 Block *b = _cfg->_blocks[i]; | |
365 | |
366 // Sum all instruction sizes to compute block size | |
367 uint last_inst = b->_nodes.size(); | |
368 uint blk_size = 0; | |
369 for( uint j = 0; j<last_inst; j++ ) { | |
370 nj = b->_nodes[j]; | |
371 uint inst_size = nj->size(_regalloc); | |
372 blk_size += inst_size; | |
373 // Handle machine instruction nodes | |
374 if( nj->is_Mach() ) { | |
375 MachNode *mach = nj->as_Mach(); | |
376 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding | |
377 reloc_size += mach->reloc(); | |
378 if( mach->is_MachCall() ) { | |
379 MachCallNode *mcall = mach->as_MachCall(); | |
380 // This destination address is NOT PC-relative | |
381 | |
382 mcall->method_set((intptr_t)mcall->entry_point()); | |
383 | |
384 if( mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method ) { | |
385 stub_size += size_java_to_interp(); | |
386 reloc_size += reloc_java_to_interp(); | |
387 } | |
388 } else if (mach->is_MachSafePoint()) { | |
389 // If call/safepoint are adjacent, account for possible | |
390 // nop to disambiguate the two safepoints. | |
391 if (min_offset_from_last_call == 0) { | |
392 blk_size += nop_size; | |
393 } | |
394 } | |
395 } | |
396 min_offset_from_last_call += inst_size; | |
397 // Remember end of call offset | |
398 if (nj->is_MachCall() && nj->as_MachCall()->is_safepoint_node()) { | |
399 min_offset_from_last_call = 0; | |
400 } | |
401 } | |
402 | |
403 // During short branch replacement, we store the relative (to blk_starts) | |
404 // end of jump in jmp_end, rather than the absolute end of jump. This | |
405 // is so that we do not need to recompute sizes of all nodes when we compute | |
406 // correct blk_starts in our next sizing pass. | |
407 jmp_end[i] = blk_size; | |
408 DEBUG_ONLY( jmp_target[i] = 0; ) | |
409 | |
410 // When the next block starts a loop, we may insert pad NOP | |
411 // instructions. Since we cannot know our future alignment, | |
412 // assume the worst. | |
413 if( i<_cfg->_num_blocks-1 ) { | |
414 Block *nb = _cfg->_blocks[i+1]; | |
415 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit(); | |
416 if( max_loop_pad > 0 ) { | |
417 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), ""); | |
418 blk_size += max_loop_pad; | |
419 } | |
420 } | |
421 | |
422 // Save block size; update total method size | |
423 blk_starts[i+1] = blk_starts[i]+blk_size; | |
424 } | |
425 | |
426 // Step two, replace eligible long jumps. | |
427 | |
428 // Note: this will only get the long branches within short branch | |
429 // range. Another pass might detect more branches that became | |
430 // candidates because the shortening in the first pass exposed | |
431 // more opportunities. Unfortunately, this would require | |
432 // recomputing the starting and ending positions for the blocks | |
433 for( i=0; i<_cfg->_num_blocks; i++ ) { | |
434 Block *b = _cfg->_blocks[i]; | |
435 | |
436 int j; | |
437 // Find the branch; ignore trailing NOPs. | |
438 for( j = b->_nodes.size()-1; j>=0; j-- ) { | |
439 nj = b->_nodes[j]; | |
440 if( !nj->is_Mach() || nj->as_Mach()->ideal_Opcode() != Op_Con ) | |
441 break; | |
442 } | |
443 | |
444 if (j >= 0) { | |
445 if( nj->is_Mach() && nj->as_Mach()->may_be_short_branch() ) { | |
446 MachNode *mach = nj->as_Mach(); | |
447 // This requires the TRUE branch target be in succs[0] | |
448 uint bnum = b->non_connector_successor(0)->_pre_order; | |
449 uintptr_t target = blk_starts[bnum]; | |
450 if( mach->is_pc_relative() ) { | |
451 int offset = target-(blk_starts[i] + jmp_end[i]); | |
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452 if (_matcher->is_short_branch_offset(mach->rule(), offset)) { |
0 | 453 // We've got a winner. Replace this branch. |
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454 MachNode* replacement = mach->short_branch_version(this); |
0 | 455 b->_nodes.map(j, replacement); |
222 | 456 mach->subsume_by(replacement); |
0 | 457 |
458 // Update the jmp_end size to save time in our | |
459 // next pass. | |
460 jmp_end[i] -= (mach->size(_regalloc) - replacement->size(_regalloc)); | |
461 DEBUG_ONLY( jmp_target[i] = bnum; ); | |
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462 DEBUG_ONLY( jmp_rule[i] = mach->rule(); ); |
0 | 463 } |
464 } else { | |
465 #ifndef PRODUCT | |
466 mach->dump(3); | |
467 #endif | |
468 Unimplemented(); | |
469 } | |
470 } | |
471 } | |
472 } | |
473 | |
474 // Compute the size of first NumberOfLoopInstrToAlign instructions at head | |
475 // of a loop. It is used to determine the padding for loop alignment. | |
476 compute_loop_first_inst_sizes(); | |
477 | |
478 // Step 3, compute the offsets of all the labels | |
479 uint last_call_adr = max_uint; | |
480 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
481 // copy the offset of the beginning to the corresponding label | |
482 assert(labels[i].is_unused(), "cannot patch at this point"); | |
483 labels[i].bind_loc(blk_starts[i], CodeBuffer::SECT_INSTS); | |
484 | |
485 // insert padding for any instructions that need it | |
486 Block *b = _cfg->_blocks[i]; | |
487 uint last_inst = b->_nodes.size(); | |
488 uint adr = blk_starts[i]; | |
489 for( uint j = 0; j<last_inst; j++ ) { | |
490 nj = b->_nodes[j]; | |
491 if( nj->is_Mach() ) { | |
492 int padding = nj->as_Mach()->compute_padding(adr); | |
493 // If call/safepoint are adjacent insert a nop (5010568) | |
494 if (padding == 0 && nj->is_MachSafePoint() && !nj->is_MachCall() && | |
495 adr == last_call_adr ) { | |
496 padding = nop_size; | |
497 } | |
498 if(padding > 0) { | |
499 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); | |
500 int nops_cnt = padding / nop_size; | |
501 MachNode *nop = new (this) MachNopNode(nops_cnt); | |
502 b->_nodes.insert(j++, nop); | |
503 _cfg->_bbs.map( nop->_idx, b ); | |
504 adr += padding; | |
505 last_inst++; | |
506 } | |
507 } | |
508 adr += nj->size(_regalloc); | |
509 | |
510 // Remember end of call offset | |
511 if (nj->is_MachCall() && nj->as_MachCall()->is_safepoint_node()) { | |
512 last_call_adr = adr; | |
513 } | |
514 } | |
515 | |
516 if ( i != _cfg->_num_blocks-1) { | |
517 // Get the size of the block | |
518 uint blk_size = adr - blk_starts[i]; | |
519 | |
418 | 520 // When the next block is the top of a loop, we may insert pad NOP |
0 | 521 // instructions. |
522 Block *nb = _cfg->_blocks[i+1]; | |
523 int current_offset = blk_starts[i] + blk_size; | |
524 current_offset += nb->alignment_padding(current_offset); | |
525 // Save block size; update total method size | |
526 blk_starts[i+1] = current_offset; | |
527 } | |
528 } | |
529 | |
530 #ifdef ASSERT | |
531 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
532 if( jmp_target[i] != 0 ) { | |
533 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_end[i]); | |
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534 if (!_matcher->is_short_branch_offset(jmp_rule[i], offset)) { |
0 | 535 tty->print_cr("target (%d) - jmp_end(%d) = offset (%d), jmp_block B%d, target_block B%d", blk_starts[jmp_target[i]], blk_starts[i] + jmp_end[i], offset, i, jmp_target[i]); |
536 } | |
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537 assert(_matcher->is_short_branch_offset(jmp_rule[i], offset), "Displacement too large for short jmp"); |
0 | 538 } |
539 } | |
540 #endif | |
541 | |
542 // ------------------ | |
543 // Compute size for code buffer | |
544 code_size = blk_starts[i-1] + jmp_end[i-1]; | |
545 | |
546 // Relocation records | |
547 reloc_size += 1; // Relo entry for exception handler | |
548 | |
549 // Adjust reloc_size to number of record of relocation info | |
550 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for | |
551 // a relocation index. | |
552 // The CodeBuffer will expand the locs array if this estimate is too low. | |
553 reloc_size *= 10 / sizeof(relocInfo); | |
554 } | |
555 | |
556 //------------------------------FillLocArray----------------------------------- | |
557 // Create a bit of debug info and append it to the array. The mapping is from | |
558 // Java local or expression stack to constant, register or stack-slot. For | |
559 // doubles, insert 2 mappings and return 1 (to tell the caller that the next | |
560 // entry has been taken care of and caller should skip it). | |
561 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) { | |
562 // This should never have accepted Bad before | |
563 assert(OptoReg::is_valid(regnum), "location must be valid"); | |
564 return (OptoReg::is_reg(regnum)) | |
565 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) ) | |
566 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum))); | |
567 } | |
568 | |
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569 |
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570 ObjectValue* |
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571 Compile::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) { |
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572 for (int i = 0; i < objs->length(); i++) { |
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573 assert(objs->at(i)->is_object(), "corrupt object cache"); |
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574 ObjectValue* sv = (ObjectValue*) objs->at(i); |
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575 if (sv->id() == id) { |
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576 return sv; |
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577 } |
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578 } |
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579 // Otherwise.. |
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580 return NULL; |
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581 } |
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582 |
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583 void Compile::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs, |
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584 ObjectValue* sv ) { |
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585 assert(sv_for_node_id(objs, sv->id()) == NULL, "Precondition"); |
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586 objs->append(sv); |
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587 } |
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588 |
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589 |
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590 void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local, |
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591 GrowableArray<ScopeValue*> *array, |
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592 GrowableArray<ScopeValue*> *objs ) { |
0 | 593 assert( local, "use _top instead of null" ); |
594 if (array->length() != idx) { | |
595 assert(array->length() == idx + 1, "Unexpected array count"); | |
596 // Old functionality: | |
597 // return | |
598 // New functionality: | |
599 // Assert if the local is not top. In product mode let the new node | |
600 // override the old entry. | |
601 assert(local == top(), "LocArray collision"); | |
602 if (local == top()) { | |
603 return; | |
604 } | |
605 array->pop(); | |
606 } | |
607 const Type *t = local->bottom_type(); | |
608 | |
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609 // Is it a safepoint scalar object node? |
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610 if (local->is_SafePointScalarObject()) { |
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611 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject(); |
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612 |
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613 ObjectValue* sv = Compile::sv_for_node_id(objs, spobj->_idx); |
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614 if (sv == NULL) { |
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615 ciKlass* cik = t->is_oopptr()->klass(); |
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616 assert(cik->is_instance_klass() || |
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617 cik->is_array_klass(), "Not supported allocation."); |
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618 sv = new ObjectValue(spobj->_idx, |
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619 new ConstantOopWriteValue(cik->constant_encoding())); |
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620 Compile::set_sv_for_object_node(objs, sv); |
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621 |
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622 uint first_ind = spobj->first_index(); |
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623 for (uint i = 0; i < spobj->n_fields(); i++) { |
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624 Node* fld_node = sfpt->in(first_ind+i); |
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625 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs); |
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626 } |
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627 } |
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628 array->append(sv); |
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629 return; |
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630 } |
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631 |
0 | 632 // Grab the register number for the local |
633 OptoReg::Name regnum = _regalloc->get_reg_first(local); | |
634 if( OptoReg::is_valid(regnum) ) {// Got a register/stack? | |
635 // Record the double as two float registers. | |
636 // The register mask for such a value always specifies two adjacent | |
637 // float registers, with the lower register number even. | |
638 // Normally, the allocation of high and low words to these registers | |
639 // is irrelevant, because nearly all operations on register pairs | |
640 // (e.g., StoreD) treat them as a single unit. | |
641 // Here, we assume in addition that the words in these two registers | |
642 // stored "naturally" (by operations like StoreD and double stores | |
643 // within the interpreter) such that the lower-numbered register | |
644 // is written to the lower memory address. This may seem like | |
645 // a machine dependency, but it is not--it is a requirement on | |
646 // the author of the <arch>.ad file to ensure that, for every | |
647 // even/odd double-register pair to which a double may be allocated, | |
648 // the word in the even single-register is stored to the first | |
649 // memory word. (Note that register numbers are completely | |
650 // arbitrary, and are not tied to any machine-level encodings.) | |
651 #ifdef _LP64 | |
652 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) { | |
653 array->append(new ConstantIntValue(0)); | |
654 array->append(new_loc_value( _regalloc, regnum, Location::dbl )); | |
655 } else if ( t->base() == Type::Long ) { | |
656 array->append(new ConstantIntValue(0)); | |
657 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
658 } else if ( t->base() == Type::RawPtr ) { | |
659 // jsr/ret return address which must be restored into a the full | |
660 // width 64-bit stack slot. | |
661 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
662 } | |
663 #else //_LP64 | |
664 #ifdef SPARC | |
665 if (t->base() == Type::Long && OptoReg::is_reg(regnum)) { | |
666 // For SPARC we have to swap high and low words for | |
667 // long values stored in a single-register (g0-g7). | |
668 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
669 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
670 } else | |
671 #endif //SPARC | |
672 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) { | |
673 // Repack the double/long as two jints. | |
674 // The convention the interpreter uses is that the second local | |
675 // holds the first raw word of the native double representation. | |
676 // This is actually reasonable, since locals and stack arrays | |
677 // grow downwards in all implementations. | |
678 // (If, on some machine, the interpreter's Java locals or stack | |
679 // were to grow upwards, the embedded doubles would be word-swapped.) | |
680 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
681 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
682 } | |
683 #endif //_LP64 | |
684 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) && | |
685 OptoReg::is_reg(regnum) ) { | |
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686 array->append(new_loc_value( _regalloc, regnum, Matcher::float_in_double() |
0 | 687 ? Location::float_in_dbl : Location::normal )); |
688 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) { | |
689 array->append(new_loc_value( _regalloc, regnum, Matcher::int_in_long | |
690 ? Location::int_in_long : Location::normal )); | |
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691 } else if( t->base() == Type::NarrowOop ) { |
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692 array->append(new_loc_value( _regalloc, regnum, Location::narrowoop )); |
0 | 693 } else { |
694 array->append(new_loc_value( _regalloc, regnum, _regalloc->is_oop(local) ? Location::oop : Location::normal )); | |
695 } | |
696 return; | |
697 } | |
698 | |
699 // No register. It must be constant data. | |
700 switch (t->base()) { | |
701 case Type::Half: // Second half of a double | |
702 ShouldNotReachHere(); // Caller should skip 2nd halves | |
703 break; | |
704 case Type::AnyPtr: | |
705 array->append(new ConstantOopWriteValue(NULL)); | |
706 break; | |
707 case Type::AryPtr: | |
708 case Type::InstPtr: | |
709 case Type::KlassPtr: // fall through | |
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710 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->constant_encoding())); |
0 | 711 break; |
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712 case Type::NarrowOop: |
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713 if (t == TypeNarrowOop::NULL_PTR) { |
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714 array->append(new ConstantOopWriteValue(NULL)); |
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715 } else { |
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716 array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->constant_encoding())); |
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717 } |
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718 break; |
0 | 719 case Type::Int: |
720 array->append(new ConstantIntValue(t->is_int()->get_con())); | |
721 break; | |
722 case Type::RawPtr: | |
723 // A return address (T_ADDRESS). | |
724 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI"); | |
725 #ifdef _LP64 | |
726 // Must be restored to the full-width 64-bit stack slot. | |
727 array->append(new ConstantLongValue(t->is_ptr()->get_con())); | |
728 #else | |
729 array->append(new ConstantIntValue(t->is_ptr()->get_con())); | |
730 #endif | |
731 break; | |
732 case Type::FloatCon: { | |
733 float f = t->is_float_constant()->getf(); | |
734 array->append(new ConstantIntValue(jint_cast(f))); | |
735 break; | |
736 } | |
737 case Type::DoubleCon: { | |
738 jdouble d = t->is_double_constant()->getd(); | |
739 #ifdef _LP64 | |
740 array->append(new ConstantIntValue(0)); | |
741 array->append(new ConstantDoubleValue(d)); | |
742 #else | |
743 // Repack the double as two jints. | |
744 // The convention the interpreter uses is that the second local | |
745 // holds the first raw word of the native double representation. | |
746 // This is actually reasonable, since locals and stack arrays | |
747 // grow downwards in all implementations. | |
748 // (If, on some machine, the interpreter's Java locals or stack | |
749 // were to grow upwards, the embedded doubles would be word-swapped.) | |
750 jint *dp = (jint*)&d; | |
751 array->append(new ConstantIntValue(dp[1])); | |
752 array->append(new ConstantIntValue(dp[0])); | |
753 #endif | |
754 break; | |
755 } | |
756 case Type::Long: { | |
757 jlong d = t->is_long()->get_con(); | |
758 #ifdef _LP64 | |
759 array->append(new ConstantIntValue(0)); | |
760 array->append(new ConstantLongValue(d)); | |
761 #else | |
762 // Repack the long as two jints. | |
763 // The convention the interpreter uses is that the second local | |
764 // holds the first raw word of the native double representation. | |
765 // This is actually reasonable, since locals and stack arrays | |
766 // grow downwards in all implementations. | |
767 // (If, on some machine, the interpreter's Java locals or stack | |
768 // were to grow upwards, the embedded doubles would be word-swapped.) | |
769 jint *dp = (jint*)&d; | |
770 array->append(new ConstantIntValue(dp[1])); | |
771 array->append(new ConstantIntValue(dp[0])); | |
772 #endif | |
773 break; | |
774 } | |
775 case Type::Top: // Add an illegal value here | |
776 array->append(new LocationValue(Location())); | |
777 break; | |
778 default: | |
779 ShouldNotReachHere(); | |
780 break; | |
781 } | |
782 } | |
783 | |
784 // Determine if this node starts a bundle | |
785 bool Compile::starts_bundle(const Node *n) const { | |
786 return (_node_bundling_limit > n->_idx && | |
787 _node_bundling_base[n->_idx].starts_bundle()); | |
788 } | |
789 | |
790 //--------------------------Process_OopMap_Node-------------------------------- | |
791 void Compile::Process_OopMap_Node(MachNode *mach, int current_offset) { | |
792 | |
793 // Handle special safepoint nodes for synchronization | |
794 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
795 MachCallNode *mcall; | |
796 | |
797 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
798 assert( is_node_getting_a_safepoint(mach), "logic does not match; false negative"); | |
799 #endif | |
800 | |
801 int safepoint_pc_offset = current_offset; | |
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802 bool is_method_handle_invoke = false; |
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803 bool return_oop = false; |
0 | 804 |
805 // Add the safepoint in the DebugInfoRecorder | |
806 if( !mach->is_MachCall() ) { | |
807 mcall = NULL; | |
808 debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map); | |
809 } else { | |
810 mcall = mach->as_MachCall(); | |
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811 |
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812 // Is the call a MethodHandle call? |
1265 | 813 if (mcall->is_MachCallJava()) { |
814 if (mcall->as_MachCallJava()->_method_handle_invoke) { | |
815 assert(has_method_handle_invokes(), "must have been set during call generation"); | |
816 is_method_handle_invoke = true; | |
817 } | |
818 } | |
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819 |
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820 // Check if a call returns an object. |
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821 if (mcall->return_value_is_used() && |
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822 mcall->tf()->range()->field_at(TypeFunc::Parms)->isa_ptr()) { |
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823 return_oop = true; |
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824 } |
0 | 825 safepoint_pc_offset += mcall->ret_addr_offset(); |
826 debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map); | |
827 } | |
828 | |
829 // Loop over the JVMState list to add scope information | |
830 // Do not skip safepoints with a NULL method, they need monitor info | |
831 JVMState* youngest_jvms = sfn->jvms(); | |
832 int max_depth = youngest_jvms->depth(); | |
833 | |
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834 // Allocate the object pool for scalar-replaced objects -- the map from |
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835 // small-integer keys (which can be recorded in the local and ostack |
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836 // arrays) to descriptions of the object state. |
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837 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>(); |
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838 |
0 | 839 // Visit scopes from oldest to youngest. |
840 for (int depth = 1; depth <= max_depth; depth++) { | |
841 JVMState* jvms = youngest_jvms->of_depth(depth); | |
842 int idx; | |
843 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
844 // Safepoints that do not have method() set only provide oop-map and monitor info | |
845 // to support GC; these do not support deoptimization. | |
846 int num_locs = (method == NULL) ? 0 : jvms->loc_size(); | |
847 int num_exps = (method == NULL) ? 0 : jvms->stk_size(); | |
848 int num_mon = jvms->nof_monitors(); | |
849 assert(method == NULL || jvms->bci() < 0 || num_locs == method->max_locals(), | |
850 "JVMS local count must match that of the method"); | |
851 | |
852 // Add Local and Expression Stack Information | |
853 | |
854 // Insert locals into the locarray | |
855 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs); | |
856 for( idx = 0; idx < num_locs; idx++ ) { | |
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857 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs ); |
0 | 858 } |
859 | |
860 // Insert expression stack entries into the exparray | |
861 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps); | |
862 for( idx = 0; idx < num_exps; idx++ ) { | |
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863 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs ); |
0 | 864 } |
865 | |
866 // Add in mappings of the monitors | |
867 assert( !method || | |
868 !method->is_synchronized() || | |
869 method->is_native() || | |
870 num_mon > 0 || | |
871 !GenerateSynchronizationCode, | |
872 "monitors must always exist for synchronized methods"); | |
873 | |
874 // Build the growable array of ScopeValues for exp stack | |
875 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon); | |
876 | |
877 // Loop over monitors and insert into array | |
878 for(idx = 0; idx < num_mon; idx++) { | |
879 // Grab the node that defines this monitor | |
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880 Node* box_node = sfn->monitor_box(jvms, idx); |
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881 Node* obj_node = sfn->monitor_obj(jvms, idx); |
0 | 882 |
883 // Create ScopeValue for object | |
884 ScopeValue *scval = NULL; | |
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885 |
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886 if( obj_node->is_SafePointScalarObject() ) { |
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887 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject(); |
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888 scval = Compile::sv_for_node_id(objs, spobj->_idx); |
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889 if (scval == NULL) { |
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890 const Type *t = obj_node->bottom_type(); |
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891 ciKlass* cik = t->is_oopptr()->klass(); |
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892 assert(cik->is_instance_klass() || |
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893 cik->is_array_klass(), "Not supported allocation."); |
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894 ObjectValue* sv = new ObjectValue(spobj->_idx, |
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895 new ConstantOopWriteValue(cik->constant_encoding())); |
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896 Compile::set_sv_for_object_node(objs, sv); |
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897 |
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898 uint first_ind = spobj->first_index(); |
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899 for (uint i = 0; i < spobj->n_fields(); i++) { |
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900 Node* fld_node = sfn->in(first_ind+i); |
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901 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs); |
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902 } |
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903 scval = sv; |
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904 } |
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905 } else if( !obj_node->is_Con() ) { |
0 | 906 OptoReg::Name obj_reg = _regalloc->get_reg_first(obj_node); |
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907 if( obj_node->bottom_type()->base() == Type::NarrowOop ) { |
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908 scval = new_loc_value( _regalloc, obj_reg, Location::narrowoop ); |
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909 } else { |
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910 scval = new_loc_value( _regalloc, obj_reg, Location::oop ); |
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911 } |
0 | 912 } else { |
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913 const TypePtr *tp = obj_node->bottom_type()->make_ptr(); |
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914 scval = new ConstantOopWriteValue(tp->is_instptr()->const_oop()->constant_encoding()); |
0 | 915 } |
916 | |
917 OptoReg::Name box_reg = BoxLockNode::stack_slot(box_node); | |
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918 Location basic_lock = Location::new_stk_loc(Location::normal,_regalloc->reg2offset(box_reg)); |
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919 while( !box_node->is_BoxLock() ) box_node = box_node->in(1); |
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920 monarray->append(new MonitorValue(scval, basic_lock, box_node->as_BoxLock()->is_eliminated())); |
0 | 921 } |
922 | |
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923 // We dump the object pool first, since deoptimization reads it in first. |
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924 debug_info()->dump_object_pool(objs); |
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925 |
0 | 926 // Build first class objects to pass to scope |
927 DebugToken *locvals = debug_info()->create_scope_values(locarray); | |
928 DebugToken *expvals = debug_info()->create_scope_values(exparray); | |
929 DebugToken *monvals = debug_info()->create_monitor_values(monarray); | |
930 | |
931 // Make method available for all Safepoints | |
932 ciMethod* scope_method = method ? method : _method; | |
933 // Describe the scope here | |
934 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI"); | |
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935 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest"); |
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936 // Now we can describe the scope. |
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937 debug_info()->describe_scope(safepoint_pc_offset, scope_method, jvms->bci(), jvms->should_reexecute(), is_method_handle_invoke, return_oop, locvals, expvals, monvals); |
0 | 938 } // End jvms loop |
939 | |
940 // Mark the end of the scope set. | |
941 debug_info()->end_safepoint(safepoint_pc_offset); | |
942 } | |
943 | |
944 | |
945 | |
946 // A simplified version of Process_OopMap_Node, to handle non-safepoints. | |
947 class NonSafepointEmitter { | |
948 Compile* C; | |
949 JVMState* _pending_jvms; | |
950 int _pending_offset; | |
951 | |
952 void emit_non_safepoint(); | |
953 | |
954 public: | |
955 NonSafepointEmitter(Compile* compile) { | |
956 this->C = compile; | |
957 _pending_jvms = NULL; | |
958 _pending_offset = 0; | |
959 } | |
960 | |
961 void observe_instruction(Node* n, int pc_offset) { | |
962 if (!C->debug_info()->recording_non_safepoints()) return; | |
963 | |
964 Node_Notes* nn = C->node_notes_at(n->_idx); | |
965 if (nn == NULL || nn->jvms() == NULL) return; | |
966 if (_pending_jvms != NULL && | |
967 _pending_jvms->same_calls_as(nn->jvms())) { | |
968 // Repeated JVMS? Stretch it up here. | |
969 _pending_offset = pc_offset; | |
970 } else { | |
971 if (_pending_jvms != NULL && | |
972 _pending_offset < pc_offset) { | |
973 emit_non_safepoint(); | |
974 } | |
975 _pending_jvms = NULL; | |
976 if (pc_offset > C->debug_info()->last_pc_offset()) { | |
977 // This is the only way _pending_jvms can become non-NULL: | |
978 _pending_jvms = nn->jvms(); | |
979 _pending_offset = pc_offset; | |
980 } | |
981 } | |
982 } | |
983 | |
984 // Stay out of the way of real safepoints: | |
985 void observe_safepoint(JVMState* jvms, int pc_offset) { | |
986 if (_pending_jvms != NULL && | |
987 !_pending_jvms->same_calls_as(jvms) && | |
988 _pending_offset < pc_offset) { | |
989 emit_non_safepoint(); | |
990 } | |
991 _pending_jvms = NULL; | |
992 } | |
993 | |
994 void flush_at_end() { | |
995 if (_pending_jvms != NULL) { | |
996 emit_non_safepoint(); | |
997 } | |
998 _pending_jvms = NULL; | |
999 } | |
1000 }; | |
1001 | |
1002 void NonSafepointEmitter::emit_non_safepoint() { | |
1003 JVMState* youngest_jvms = _pending_jvms; | |
1004 int pc_offset = _pending_offset; | |
1005 | |
1006 // Clear it now: | |
1007 _pending_jvms = NULL; | |
1008 | |
1009 DebugInformationRecorder* debug_info = C->debug_info(); | |
1010 assert(debug_info->recording_non_safepoints(), "sanity"); | |
1011 | |
1012 debug_info->add_non_safepoint(pc_offset); | |
1013 int max_depth = youngest_jvms->depth(); | |
1014 | |
1015 // Visit scopes from oldest to youngest. | |
1016 for (int depth = 1; depth <= max_depth; depth++) { | |
1017 JVMState* jvms = youngest_jvms->of_depth(depth); | |
1018 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
900
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1019 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest"); |
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1020 debug_info->describe_scope(pc_offset, method, jvms->bci(), jvms->should_reexecute()); |
0 | 1021 } |
1022 | |
1023 // Mark the end of the scope set. | |
1024 debug_info->end_non_safepoint(pc_offset); | |
1025 } | |
1026 | |
1027 | |
1028 | |
1029 // helper for Fill_buffer bailout logic | |
1030 static void turn_off_compiler(Compile* C) { | |
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1031 if (CodeCache::largest_free_block() >= CodeCacheMinimumFreeSpace*10) { |
0 | 1032 // Do not turn off compilation if a single giant method has |
1033 // blown the code cache size. | |
1034 C->record_failure("excessive request to CodeCache"); | |
1035 } else { | |
28 | 1036 // Let CompilerBroker disable further compilations. |
0 | 1037 C->record_failure("CodeCache is full"); |
1038 } | |
1039 } | |
1040 | |
1041 | |
1042 //------------------------------Fill_buffer------------------------------------ | |
1043 void Compile::Fill_buffer() { | |
1044 | |
1045 // Set the initially allocated size | |
1046 int code_req = initial_code_capacity; | |
1047 int locs_req = initial_locs_capacity; | |
1048 int stub_req = TraceJumps ? initial_stub_capacity * 10 : initial_stub_capacity; | |
1049 int const_req = initial_const_capacity; | |
1050 bool labels_not_set = true; | |
1051 | |
1052 int pad_req = NativeCall::instruction_size; | |
1053 // The extra spacing after the code is necessary on some platforms. | |
1054 // Sometimes we need to patch in a jump after the last instruction, | |
1055 // if the nmethod has been deoptimized. (See 4932387, 4894843.) | |
1056 | |
1057 uint i; | |
1058 // Compute the byte offset where we can store the deopt pc. | |
1059 if (fixed_slots() != 0) { | |
1060 _orig_pc_slot_offset_in_bytes = _regalloc->reg2offset(OptoReg::stack2reg(_orig_pc_slot)); | |
1061 } | |
1062 | |
1063 // Compute prolog code size | |
1064 _method_size = 0; | |
1065 _frame_slots = OptoReg::reg2stack(_matcher->_old_SP)+_regalloc->_framesize; | |
1066 #ifdef IA64 | |
1067 if (save_argument_registers()) { | |
1068 // 4815101: this is a stub with implicit and unknown precision fp args. | |
1069 // The usual spill mechanism can only generate stfd's in this case, which | |
1070 // doesn't work if the fp reg to spill contains a single-precision denorm. | |
1071 // Instead, we hack around the normal spill mechanism using stfspill's and | |
1072 // ldffill's in the MachProlog and MachEpilog emit methods. We allocate | |
1073 // space here for the fp arg regs (f8-f15) we're going to thusly spill. | |
1074 // | |
1075 // If we ever implement 16-byte 'registers' == stack slots, we can | |
1076 // get rid of this hack and have SpillCopy generate stfspill/ldffill | |
1077 // instead of stfd/stfs/ldfd/ldfs. | |
1078 _frame_slots += 8*(16/BytesPerInt); | |
1079 } | |
1080 #endif | |
1081 assert( _frame_slots >= 0 && _frame_slots < 1000000, "sanity check" ); | |
1082 | |
1083 // Create an array of unused labels, one for each basic block | |
1084 Label *blk_labels = NEW_RESOURCE_ARRAY(Label, _cfg->_num_blocks+1); | |
1085 | |
1086 for( i=0; i <= _cfg->_num_blocks; i++ ) { | |
1087 blk_labels[i].init(); | |
1088 } | |
1089 | |
2008 | 1090 if (has_mach_constant_base_node()) { |
1091 // Fill the constant table. | |
1092 // Note: This must happen before Shorten_branches. | |
1093 for (i = 0; i < _cfg->_num_blocks; i++) { | |
1094 Block* b = _cfg->_blocks[i]; | |
1095 | |
1096 for (uint j = 0; j < b->_nodes.size(); j++) { | |
1097 Node* n = b->_nodes[j]; | |
1098 | |
1099 // If the node is a MachConstantNode evaluate the constant | |
1100 // value section. | |
1101 if (n->is_MachConstant()) { | |
1102 MachConstantNode* machcon = n->as_MachConstant(); | |
1103 machcon->eval_constant(C); | |
1104 } | |
1105 } | |
1106 } | |
1107 | |
1108 // Calculate the offsets of the constants and the size of the | |
1109 // constant table (including the padding to the next section). | |
1110 constant_table().calculate_offsets_and_size(); | |
1111 const_req = constant_table().size(); | |
1112 } | |
1113 | |
1114 // Initialize the space for the BufferBlob used to find and verify | |
1115 // instruction size in MachNode::emit_size() | |
1116 init_scratch_buffer_blob(const_req); | |
1117 if (failing()) return; // Out of memory | |
1118 | |
0 | 1119 // If this machine supports different size branch offsets, then pre-compute |
1120 // the length of the blocks | |
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1121 if( _matcher->is_short_branch_offset(-1, 0) ) { |
2008 | 1122 Shorten_branches(blk_labels, code_req, locs_req, stub_req); |
0 | 1123 labels_not_set = false; |
1124 } | |
1125 | |
1126 // nmethod and CodeBuffer count stubs & constants as part of method's code. | |
1127 int exception_handler_req = size_exception_handler(); | |
1128 int deopt_handler_req = size_deopt_handler(); | |
1129 exception_handler_req += MAX_stubs_size; // add marginal slop for handler | |
1130 deopt_handler_req += MAX_stubs_size; // add marginal slop for handler | |
1131 stub_req += MAX_stubs_size; // ensure per-stub margin | |
1132 code_req += MAX_inst_size; // ensure per-instruction margin | |
1265 | 1133 |
0 | 1134 if (StressCodeBuffers) |
1135 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion | |
1265 | 1136 |
1137 int total_req = | |
2008 | 1138 const_req + |
1265 | 1139 code_req + |
1140 pad_req + | |
1141 stub_req + | |
1142 exception_handler_req + | |
2008 | 1143 deopt_handler_req; // deopt handler |
1265 | 1144 |
1145 if (has_method_handle_invokes()) | |
1146 total_req += deopt_handler_req; // deopt MH handler | |
1147 | |
0 | 1148 CodeBuffer* cb = code_buffer(); |
1149 cb->initialize(total_req, locs_req); | |
1150 | |
1151 // Have we run out of code space? | |
1202 | 1152 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
0 | 1153 turn_off_compiler(this); |
1154 return; | |
1155 } | |
1156 // Configure the code buffer. | |
1157 cb->initialize_consts_size(const_req); | |
1158 cb->initialize_stubs_size(stub_req); | |
1159 cb->initialize_oop_recorder(env()->oop_recorder()); | |
1160 | |
1161 // fill in the nop array for bundling computations | |
1162 MachNode *_nop_list[Bundle::_nop_count]; | |
1163 Bundle::initialize_nops(_nop_list, this); | |
1164 | |
1165 // Create oopmap set. | |
1166 _oop_map_set = new OopMapSet(); | |
1167 | |
1168 // !!!!! This preserves old handling of oopmaps for now | |
1169 debug_info()->set_oopmaps(_oop_map_set); | |
1170 | |
1171 // Count and start of implicit null check instructions | |
1172 uint inct_cnt = 0; | |
1173 uint *inct_starts = NEW_RESOURCE_ARRAY(uint, _cfg->_num_blocks+1); | |
1174 | |
1175 // Count and start of calls | |
1176 uint *call_returns = NEW_RESOURCE_ARRAY(uint, _cfg->_num_blocks+1); | |
1177 | |
1178 uint return_offset = 0; | |
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1179 int nop_size = (new (this) MachNopNode())->size(_regalloc); |
0 | 1180 |
1181 int previous_offset = 0; | |
1182 int current_offset = 0; | |
1183 int last_call_offset = -1; | |
1184 | |
1185 // Create an array of unused labels, one for each basic block, if printing is enabled | |
1186 #ifndef PRODUCT | |
1187 int *node_offsets = NULL; | |
1188 uint node_offset_limit = unique(); | |
1189 | |
1190 | |
1191 if ( print_assembly() ) | |
1192 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit); | |
1193 #endif | |
1194 | |
1195 NonSafepointEmitter non_safepoints(this); // emit non-safepoints lazily | |
1196 | |
2008 | 1197 // Emit the constant table. |
1198 if (has_mach_constant_base_node()) { | |
1199 constant_table().emit(*cb); | |
1200 } | |
1201 | |
0 | 1202 // ------------------ |
1203 // Now fill in the code buffer | |
1204 Node *delay_slot = NULL; | |
1205 | |
1206 for( i=0; i < _cfg->_num_blocks; i++ ) { | |
1207 Block *b = _cfg->_blocks[i]; | |
1208 | |
1209 Node *head = b->head(); | |
1210 | |
1211 // If this block needs to start aligned (i.e, can be reached other | |
1212 // than by falling-thru from the previous block), then force the | |
1213 // start of a new bundle. | |
1214 if( Pipeline::requires_bundling() && starts_bundle(head) ) | |
1215 cb->flush_bundle(true); | |
1216 | |
1217 // Define the label at the beginning of the basic block | |
2008 | 1218 if (labels_not_set) { |
1219 MacroAssembler(cb).bind(blk_labels[b->_pre_order]); | |
1220 } else { | |
1221 assert(blk_labels[b->_pre_order].loc_pos() == cb->insts_size(), | |
1222 err_msg("label position does not match code offset: %d != %d", | |
1223 blk_labels[b->_pre_order].loc_pos(), cb->insts_size())); | |
1224 } | |
0 | 1225 |
1226 uint last_inst = b->_nodes.size(); | |
1227 | |
1228 // Emit block normally, except for last instruction. | |
1229 // Emit means "dump code bits into code buffer". | |
1230 for( uint j = 0; j<last_inst; j++ ) { | |
1231 | |
1232 // Get the node | |
1233 Node* n = b->_nodes[j]; | |
1234 | |
1235 // See if delay slots are supported | |
1236 if (valid_bundle_info(n) && | |
1237 node_bundling(n)->used_in_unconditional_delay()) { | |
1238 assert(delay_slot == NULL, "no use of delay slot node"); | |
1239 assert(n->size(_regalloc) == Pipeline::instr_unit_size(), "delay slot instruction wrong size"); | |
1240 | |
1241 delay_slot = n; | |
1242 continue; | |
1243 } | |
1244 | |
1245 // If this starts a new instruction group, then flush the current one | |
1246 // (but allow split bundles) | |
1247 if( Pipeline::requires_bundling() && starts_bundle(n) ) | |
1248 cb->flush_bundle(false); | |
1249 | |
1250 // The following logic is duplicated in the code ifdeffed for | |
605 | 1251 // ENABLE_ZAP_DEAD_LOCALS which appears above in this file. It |
0 | 1252 // should be factored out. Or maybe dispersed to the nodes? |
1253 | |
1254 // Special handling for SafePoint/Call Nodes | |
1255 bool is_mcall = false; | |
1256 if( n->is_Mach() ) { | |
1257 MachNode *mach = n->as_Mach(); | |
1258 is_mcall = n->is_MachCall(); | |
1259 bool is_sfn = n->is_MachSafePoint(); | |
1260 | |
1261 // If this requires all previous instructions be flushed, then do so | |
1262 if( is_sfn || is_mcall || mach->alignment_required() != 1) { | |
1263 cb->flush_bundle(true); | |
1748 | 1264 current_offset = cb->insts_size(); |
0 | 1265 } |
1266 | |
1267 // align the instruction if necessary | |
1268 int padding = mach->compute_padding(current_offset); | |
1269 // Make sure safepoint node for polling is distinct from a call's | |
1270 // return by adding a nop if needed. | |
1271 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset ) { | |
1272 padding = nop_size; | |
1273 } | |
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1274 assert( labels_not_set || padding == 0, "instruction should already be aligned"); |
0 | 1275 |
1276 if(padding > 0) { | |
1277 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); | |
1278 int nops_cnt = padding / nop_size; | |
1279 MachNode *nop = new (this) MachNopNode(nops_cnt); | |
1280 b->_nodes.insert(j++, nop); | |
1281 last_inst++; | |
1282 _cfg->_bbs.map( nop->_idx, b ); | |
1283 nop->emit(*cb, _regalloc); | |
1284 cb->flush_bundle(true); | |
1748 | 1285 current_offset = cb->insts_size(); |
0 | 1286 } |
1287 | |
1288 // Remember the start of the last call in a basic block | |
1289 if (is_mcall) { | |
1290 MachCallNode *mcall = mach->as_MachCall(); | |
1291 | |
1292 // This destination address is NOT PC-relative | |
1293 mcall->method_set((intptr_t)mcall->entry_point()); | |
1294 | |
1295 // Save the return address | |
1296 call_returns[b->_pre_order] = current_offset + mcall->ret_addr_offset(); | |
1297 | |
1298 if (!mcall->is_safepoint_node()) { | |
1299 is_mcall = false; | |
1300 is_sfn = false; | |
1301 } | |
1302 } | |
1303 | |
1304 // sfn will be valid whenever mcall is valid now because of inheritance | |
1305 if( is_sfn || is_mcall ) { | |
1306 | |
1307 // Handle special safepoint nodes for synchronization | |
1308 if( !is_mcall ) { | |
1309 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
1310 // !!!!! Stubs only need an oopmap right now, so bail out | |
1311 if( sfn->jvms()->method() == NULL) { | |
1312 // Write the oopmap directly to the code blob??!! | |
1313 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
1314 assert( !is_node_getting_a_safepoint(sfn), "logic does not match; false positive"); | |
1315 # endif | |
1316 continue; | |
1317 } | |
1318 } // End synchronization | |
1319 | |
1320 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
1321 current_offset); | |
1322 Process_OopMap_Node(mach, current_offset); | |
1323 } // End if safepoint | |
1324 | |
1325 // If this is a null check, then add the start of the previous instruction to the list | |
1326 else if( mach->is_MachNullCheck() ) { | |
1327 inct_starts[inct_cnt++] = previous_offset; | |
1328 } | |
1329 | |
1330 // If this is a branch, then fill in the label with the target BB's label | |
1331 else if ( mach->is_Branch() ) { | |
1332 | |
1333 if ( mach->ideal_Opcode() == Op_Jump ) { | |
1334 for (uint h = 0; h < b->_num_succs; h++ ) { | |
1335 Block* succs_block = b->_succs[h]; | |
1336 for (uint j = 1; j < succs_block->num_preds(); j++) { | |
1337 Node* jpn = succs_block->pred(j); | |
1338 if ( jpn->is_JumpProj() && jpn->in(0) == mach ) { | |
1339 uint block_num = succs_block->non_connector()->_pre_order; | |
1340 Label *blkLabel = &blk_labels[block_num]; | |
1341 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel); | |
1342 } | |
1343 } | |
1344 } | |
1345 } else { | |
1346 // For Branchs | |
1347 // This requires the TRUE branch target be in succs[0] | |
1348 uint block_num = b->non_connector_successor(0)->_pre_order; | |
1349 mach->label_set( blk_labels[block_num], block_num ); | |
1350 } | |
1351 } | |
1352 | |
1353 #ifdef ASSERT | |
605 | 1354 // Check that oop-store precedes the card-mark |
0 | 1355 else if( mach->ideal_Opcode() == Op_StoreCM ) { |
1356 uint storeCM_idx = j; | |
1357 Node *oop_store = mach->in(mach->_cnt); // First precedence edge | |
1358 assert( oop_store != NULL, "storeCM expects a precedence edge"); | |
1359 uint i4; | |
1360 for( i4 = 0; i4 < last_inst; ++i4 ) { | |
1361 if( b->_nodes[i4] == oop_store ) break; | |
1362 } | |
1363 // Note: This test can provide a false failure if other precedence | |
1364 // edges have been added to the storeCMNode. | |
1365 assert( i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store"); | |
1366 } | |
1367 #endif | |
1368 | |
1369 else if( !n->is_Proj() ) { | |
605 | 1370 // Remember the beginning of the previous instruction, in case |
0 | 1371 // it's followed by a flag-kill and a null-check. Happens on |
1372 // Intel all the time, with add-to-memory kind of opcodes. | |
1373 previous_offset = current_offset; | |
1374 } | |
1375 } | |
1376 | |
1377 // Verify that there is sufficient space remaining | |
1378 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size); | |
1202 | 1379 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
0 | 1380 turn_off_compiler(this); |
1381 return; | |
1382 } | |
1383 | |
1384 // Save the offset for the listing | |
1385 #ifndef PRODUCT | |
1386 if( node_offsets && n->_idx < node_offset_limit ) | |
1748 | 1387 node_offsets[n->_idx] = cb->insts_size(); |
0 | 1388 #endif |
1389 | |
1390 // "Normal" instruction case | |
1391 n->emit(*cb, _regalloc); | |
1748 | 1392 current_offset = cb->insts_size(); |
0 | 1393 non_safepoints.observe_instruction(n, current_offset); |
1394 | |
1395 // mcall is last "call" that can be a safepoint | |
1396 // record it so we can see if a poll will directly follow it | |
1397 // in which case we'll need a pad to make the PcDesc sites unique | |
1398 // see 5010568. This can be slightly inaccurate but conservative | |
1399 // in the case that return address is not actually at current_offset. | |
1400 // This is a small price to pay. | |
1401 | |
1402 if (is_mcall) { | |
1403 last_call_offset = current_offset; | |
1404 } | |
1405 | |
1406 // See if this instruction has a delay slot | |
1407 if ( valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { | |
1408 assert(delay_slot != NULL, "expecting delay slot node"); | |
1409 | |
1410 // Back up 1 instruction | |
1748 | 1411 cb->set_insts_end(cb->insts_end() - Pipeline::instr_unit_size()); |
0 | 1412 |
1413 // Save the offset for the listing | |
1414 #ifndef PRODUCT | |
1415 if( node_offsets && delay_slot->_idx < node_offset_limit ) | |
1748 | 1416 node_offsets[delay_slot->_idx] = cb->insts_size(); |
0 | 1417 #endif |
1418 | |
1419 // Support a SafePoint in the delay slot | |
1420 if( delay_slot->is_MachSafePoint() ) { | |
1421 MachNode *mach = delay_slot->as_Mach(); | |
1422 // !!!!! Stubs only need an oopmap right now, so bail out | |
1423 if( !mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL ) { | |
1424 // Write the oopmap directly to the code blob??!! | |
1425 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
1426 assert( !is_node_getting_a_safepoint(mach), "logic does not match; false positive"); | |
1427 # endif | |
1428 delay_slot = NULL; | |
1429 continue; | |
1430 } | |
1431 | |
1432 int adjusted_offset = current_offset - Pipeline::instr_unit_size(); | |
1433 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
1434 adjusted_offset); | |
1435 // Generate an OopMap entry | |
1436 Process_OopMap_Node(mach, adjusted_offset); | |
1437 } | |
1438 | |
1439 // Insert the delay slot instruction | |
1440 delay_slot->emit(*cb, _regalloc); | |
1441 | |
1442 // Don't reuse it | |
1443 delay_slot = NULL; | |
1444 } | |
1445 | |
1446 } // End for all instructions in block | |
1447 | |
418 | 1448 // If the next block is the top of a loop, pad this block out to align |
1449 // the loop top a little. Helps prevent pipe stalls at loop back branches. | |
0 | 1450 if( i<_cfg->_num_blocks-1 ) { |
1451 Block *nb = _cfg->_blocks[i+1]; | |
1452 uint padding = nb->alignment_padding(current_offset); | |
1453 if( padding > 0 ) { | |
1454 MachNode *nop = new (this) MachNopNode(padding / nop_size); | |
1455 b->_nodes.insert( b->_nodes.size(), nop ); | |
1456 _cfg->_bbs.map( nop->_idx, b ); | |
1457 nop->emit(*cb, _regalloc); | |
1748 | 1458 current_offset = cb->insts_size(); |
0 | 1459 } |
1460 } | |
1461 | |
1462 } // End of for all blocks | |
1463 | |
1464 non_safepoints.flush_at_end(); | |
1465 | |
1466 // Offset too large? | |
1467 if (failing()) return; | |
1468 | |
1469 // Define a pseudo-label at the end of the code | |
1470 MacroAssembler(cb).bind( blk_labels[_cfg->_num_blocks] ); | |
1471 | |
1472 // Compute the size of the first block | |
1473 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos(); | |
1474 | |
1748 | 1475 assert(cb->insts_size() < 500000, "method is unreasonably large"); |
0 | 1476 |
1477 // ------------------ | |
1478 | |
1479 #ifndef PRODUCT | |
1480 // Information on the size of the method, without the extraneous code | |
1748 | 1481 Scheduling::increment_method_size(cb->insts_size()); |
0 | 1482 #endif |
1483 | |
1484 // ------------------ | |
1485 // Fill in exception table entries. | |
1486 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels); | |
1487 | |
1488 // Only java methods have exception handlers and deopt handlers | |
1489 if (_method) { | |
1490 // Emit the exception handler code. | |
1491 _code_offsets.set_value(CodeOffsets::Exceptions, emit_exception_handler(*cb)); | |
1492 // Emit the deopt handler code. | |
1493 _code_offsets.set_value(CodeOffsets::Deopt, emit_deopt_handler(*cb)); | |
1265 | 1494 |
1495 // Emit the MethodHandle deopt handler code (if required). | |
1496 if (has_method_handle_invokes()) { | |
1497 // We can use the same code as for the normal deopt handler, we | |
1498 // just need a different entry point address. | |
1499 _code_offsets.set_value(CodeOffsets::DeoptMH, emit_deopt_handler(*cb)); | |
1500 } | |
0 | 1501 } |
1502 | |
1503 // One last check for failed CodeBuffer::expand: | |
1202 | 1504 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
0 | 1505 turn_off_compiler(this); |
1506 return; | |
1507 } | |
1508 | |
1509 #ifndef PRODUCT | |
1510 // Dump the assembly code, including basic-block numbers | |
1511 if (print_assembly()) { | |
1512 ttyLocker ttyl; // keep the following output all in one block | |
1513 if (!VMThread::should_terminate()) { // test this under the tty lock | |
1514 // This output goes directly to the tty, not the compiler log. | |
1515 // To enable tools to match it up with the compilation activity, | |
1516 // be sure to tag this tty output with the compile ID. | |
1517 if (xtty != NULL) { | |
1518 xtty->head("opto_assembly compile_id='%d'%s", compile_id(), | |
1519 is_osr_compilation() ? " compile_kind='osr'" : | |
1520 ""); | |
1521 } | |
1522 if (method() != NULL) { | |
1523 method()->print_oop(); | |
1524 print_codes(); | |
1525 } | |
1526 dump_asm(node_offsets, node_offset_limit); | |
1527 if (xtty != NULL) { | |
1528 xtty->tail("opto_assembly"); | |
1529 } | |
1530 } | |
1531 } | |
1532 #endif | |
1533 | |
1534 } | |
1535 | |
1536 void Compile::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) { | |
1537 _inc_table.set_size(cnt); | |
1538 | |
1539 uint inct_cnt = 0; | |
1540 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
1541 Block *b = _cfg->_blocks[i]; | |
1542 Node *n = NULL; | |
1543 int j; | |
1544 | |
1545 // Find the branch; ignore trailing NOPs. | |
1546 for( j = b->_nodes.size()-1; j>=0; j-- ) { | |
1547 n = b->_nodes[j]; | |
1548 if( !n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con ) | |
1549 break; | |
1550 } | |
1551 | |
1552 // If we didn't find anything, continue | |
1553 if( j < 0 ) continue; | |
1554 | |
1555 // Compute ExceptionHandlerTable subtable entry and add it | |
1556 // (skip empty blocks) | |
1557 if( n->is_Catch() ) { | |
1558 | |
1559 // Get the offset of the return from the call | |
1560 uint call_return = call_returns[b->_pre_order]; | |
1561 #ifdef ASSERT | |
1562 assert( call_return > 0, "no call seen for this basic block" ); | |
1563 while( b->_nodes[--j]->Opcode() == Op_MachProj ) ; | |
1564 assert( b->_nodes[j]->is_Call(), "CatchProj must follow call" ); | |
1565 #endif | |
1566 // last instruction is a CatchNode, find it's CatchProjNodes | |
1567 int nof_succs = b->_num_succs; | |
1568 // allocate space | |
1569 GrowableArray<intptr_t> handler_bcis(nof_succs); | |
1570 GrowableArray<intptr_t> handler_pcos(nof_succs); | |
1571 // iterate through all successors | |
1572 for (int j = 0; j < nof_succs; j++) { | |
1573 Block* s = b->_succs[j]; | |
1574 bool found_p = false; | |
1575 for( uint k = 1; k < s->num_preds(); k++ ) { | |
1576 Node *pk = s->pred(k); | |
1577 if( pk->is_CatchProj() && pk->in(0) == n ) { | |
1578 const CatchProjNode* p = pk->as_CatchProj(); | |
1579 found_p = true; | |
1580 // add the corresponding handler bci & pco information | |
1581 if( p->_con != CatchProjNode::fall_through_index ) { | |
1582 // p leads to an exception handler (and is not fall through) | |
1583 assert(s == _cfg->_blocks[s->_pre_order],"bad numbering"); | |
1584 // no duplicates, please | |
1585 if( !handler_bcis.contains(p->handler_bci()) ) { | |
1586 uint block_num = s->non_connector()->_pre_order; | |
1587 handler_bcis.append(p->handler_bci()); | |
1588 handler_pcos.append(blk_labels[block_num].loc_pos()); | |
1589 } | |
1590 } | |
1591 } | |
1592 } | |
1593 assert(found_p, "no matching predecessor found"); | |
1594 // Note: Due to empty block removal, one block may have | |
1595 // several CatchProj inputs, from the same Catch. | |
1596 } | |
1597 | |
1598 // Set the offset of the return from the call | |
1599 _handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos); | |
1600 continue; | |
1601 } | |
1602 | |
1603 // Handle implicit null exception table updates | |
1604 if( n->is_MachNullCheck() ) { | |
1605 uint block_num = b->non_connector_successor(0)->_pre_order; | |
1606 _inc_table.append( inct_starts[inct_cnt++], blk_labels[block_num].loc_pos() ); | |
1607 continue; | |
1608 } | |
1609 } // End of for all blocks fill in exception table entries | |
1610 } | |
1611 | |
1612 // Static Variables | |
1613 #ifndef PRODUCT | |
1614 uint Scheduling::_total_nop_size = 0; | |
1615 uint Scheduling::_total_method_size = 0; | |
1616 uint Scheduling::_total_branches = 0; | |
1617 uint Scheduling::_total_unconditional_delays = 0; | |
1618 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1]; | |
1619 #endif | |
1620 | |
1621 // Initializer for class Scheduling | |
1622 | |
1623 Scheduling::Scheduling(Arena *arena, Compile &compile) | |
1624 : _arena(arena), | |
1625 _cfg(compile.cfg()), | |
1626 _bbs(compile.cfg()->_bbs), | |
1627 _regalloc(compile.regalloc()), | |
1628 _reg_node(arena), | |
1629 _bundle_instr_count(0), | |
1630 _bundle_cycle_number(0), | |
1631 _scheduled(arena), | |
1632 _available(arena), | |
1633 _next_node(NULL), | |
1634 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0]), | |
1635 _pinch_free_list(arena) | |
1636 #ifndef PRODUCT | |
1637 , _branches(0) | |
1638 , _unconditional_delays(0) | |
1639 #endif | |
1640 { | |
1641 // Create a MachNopNode | |
1642 _nop = new (&compile) MachNopNode(); | |
1643 | |
1644 // Now that the nops are in the array, save the count | |
1645 // (but allow entries for the nops) | |
1646 _node_bundling_limit = compile.unique(); | |
1647 uint node_max = _regalloc->node_regs_max_index(); | |
1648 | |
1649 compile.set_node_bundling_limit(_node_bundling_limit); | |
1650 | |
605 | 1651 // This one is persistent within the Compile class |
0 | 1652 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max); |
1653 | |
1654 // Allocate space for fixed-size arrays | |
1655 _node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
1656 _uses = NEW_ARENA_ARRAY(arena, short, node_max); | |
1657 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
1658 | |
1659 // Clear the arrays | |
1660 memset(_node_bundling_base, 0, node_max * sizeof(Bundle)); | |
1661 memset(_node_latency, 0, node_max * sizeof(unsigned short)); | |
1662 memset(_uses, 0, node_max * sizeof(short)); | |
1663 memset(_current_latency, 0, node_max * sizeof(unsigned short)); | |
1664 | |
1665 // Clear the bundling information | |
1666 memcpy(_bundle_use_elements, | |
1667 Pipeline_Use::elaborated_elements, | |
1668 sizeof(Pipeline_Use::elaborated_elements)); | |
1669 | |
1670 // Get the last node | |
1671 Block *bb = _cfg->_blocks[_cfg->_blocks.size()-1]; | |
1672 | |
1673 _next_node = bb->_nodes[bb->_nodes.size()-1]; | |
1674 } | |
1675 | |
1676 #ifndef PRODUCT | |
1677 // Scheduling destructor | |
1678 Scheduling::~Scheduling() { | |
1679 _total_branches += _branches; | |
1680 _total_unconditional_delays += _unconditional_delays; | |
1681 } | |
1682 #endif | |
1683 | |
1684 // Step ahead "i" cycles | |
1685 void Scheduling::step(uint i) { | |
1686 | |
1687 Bundle *bundle = node_bundling(_next_node); | |
1688 bundle->set_starts_bundle(); | |
1689 | |
1690 // Update the bundle record, but leave the flags information alone | |
1691 if (_bundle_instr_count > 0) { | |
1692 bundle->set_instr_count(_bundle_instr_count); | |
1693 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
1694 } | |
1695 | |
1696 // Update the state information | |
1697 _bundle_instr_count = 0; | |
1698 _bundle_cycle_number += i; | |
1699 _bundle_use.step(i); | |
1700 } | |
1701 | |
1702 void Scheduling::step_and_clear() { | |
1703 Bundle *bundle = node_bundling(_next_node); | |
1704 bundle->set_starts_bundle(); | |
1705 | |
1706 // Update the bundle record | |
1707 if (_bundle_instr_count > 0) { | |
1708 bundle->set_instr_count(_bundle_instr_count); | |
1709 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
1710 | |
1711 _bundle_cycle_number += 1; | |
1712 } | |
1713 | |
1714 // Clear the bundling information | |
1715 _bundle_instr_count = 0; | |
1716 _bundle_use.reset(); | |
1717 | |
1718 memcpy(_bundle_use_elements, | |
1719 Pipeline_Use::elaborated_elements, | |
1720 sizeof(Pipeline_Use::elaborated_elements)); | |
1721 } | |
1722 | |
1723 //------------------------------ScheduleAndBundle------------------------------ | |
1724 // Perform instruction scheduling and bundling over the sequence of | |
1725 // instructions in backwards order. | |
1726 void Compile::ScheduleAndBundle() { | |
1727 | |
1728 // Don't optimize this if it isn't a method | |
1729 if (!_method) | |
1730 return; | |
1731 | |
1732 // Don't optimize this if scheduling is disabled | |
1733 if (!do_scheduling()) | |
1734 return; | |
1735 | |
1736 NOT_PRODUCT( TracePhase t2("isched", &_t_instrSched, TimeCompiler); ) | |
1737 | |
1738 // Create a data structure for all the scheduling information | |
1739 Scheduling scheduling(Thread::current()->resource_area(), *this); | |
1740 | |
2008 | 1741 // Initialize the space for the BufferBlob used to find and verify |
1742 // instruction size in MachNode::emit_size() | |
1743 init_scratch_buffer_blob(MAX_const_size); | |
1744 if (failing()) return; // Out of memory | |
1745 | |
0 | 1746 // Walk backwards over each basic block, computing the needed alignment |
1747 // Walk over all the basic blocks | |
1748 scheduling.DoScheduling(); | |
1749 } | |
1750 | |
1751 //------------------------------ComputeLocalLatenciesForward------------------- | |
1752 // Compute the latency of all the instructions. This is fairly simple, | |
1753 // because we already have a legal ordering. Walk over the instructions | |
1754 // from first to last, and compute the latency of the instruction based | |
605 | 1755 // on the latency of the preceding instruction(s). |
0 | 1756 void Scheduling::ComputeLocalLatenciesForward(const Block *bb) { |
1757 #ifndef PRODUCT | |
1758 if (_cfg->C->trace_opto_output()) | |
1759 tty->print("# -> ComputeLocalLatenciesForward\n"); | |
1760 #endif | |
1761 | |
1762 // Walk over all the schedulable instructions | |
1763 for( uint j=_bb_start; j < _bb_end; j++ ) { | |
1764 | |
1765 // This is a kludge, forcing all latency calculations to start at 1. | |
1766 // Used to allow latency 0 to force an instruction to the beginning | |
1767 // of the bb | |
1768 uint latency = 1; | |
1769 Node *use = bb->_nodes[j]; | |
1770 uint nlen = use->len(); | |
1771 | |
1772 // Walk over all the inputs | |
1773 for ( uint k=0; k < nlen; k++ ) { | |
1774 Node *def = use->in(k); | |
1775 if (!def) | |
1776 continue; | |
1777 | |
1778 uint l = _node_latency[def->_idx] + use->latency(k); | |
1779 if (latency < l) | |
1780 latency = l; | |
1781 } | |
1782 | |
1783 _node_latency[use->_idx] = latency; | |
1784 | |
1785 #ifndef PRODUCT | |
1786 if (_cfg->C->trace_opto_output()) { | |
1787 tty->print("# latency %4d: ", latency); | |
1788 use->dump(); | |
1789 } | |
1790 #endif | |
1791 } | |
1792 | |
1793 #ifndef PRODUCT | |
1794 if (_cfg->C->trace_opto_output()) | |
1795 tty->print("# <- ComputeLocalLatenciesForward\n"); | |
1796 #endif | |
1797 | |
1798 } // end ComputeLocalLatenciesForward | |
1799 | |
1800 // See if this node fits into the present instruction bundle | |
1801 bool Scheduling::NodeFitsInBundle(Node *n) { | |
1802 uint n_idx = n->_idx; | |
1803 | |
1804 // If this is the unconditional delay instruction, then it fits | |
1805 if (n == _unconditional_delay_slot) { | |
1806 #ifndef PRODUCT | |
1807 if (_cfg->C->trace_opto_output()) | |
1808 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx); | |
1809 #endif | |
1810 return (true); | |
1811 } | |
1812 | |
1813 // If the node cannot be scheduled this cycle, skip it | |
1814 if (_current_latency[n_idx] > _bundle_cycle_number) { | |
1815 #ifndef PRODUCT | |
1816 if (_cfg->C->trace_opto_output()) | |
1817 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n", | |
1818 n->_idx, _current_latency[n_idx], _bundle_cycle_number); | |
1819 #endif | |
1820 return (false); | |
1821 } | |
1822 | |
1823 const Pipeline *node_pipeline = n->pipeline(); | |
1824 | |
1825 uint instruction_count = node_pipeline->instructionCount(); | |
1826 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
1827 instruction_count = 0; | |
1828 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
1829 instruction_count++; | |
1830 | |
1831 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) { | |
1832 #ifndef PRODUCT | |
1833 if (_cfg->C->trace_opto_output()) | |
1834 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n", | |
1835 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle); | |
1836 #endif | |
1837 return (false); | |
1838 } | |
1839 | |
1840 // Don't allow non-machine nodes to be handled this way | |
1841 if (!n->is_Mach() && instruction_count == 0) | |
1842 return (false); | |
1843 | |
1844 // See if there is any overlap | |
1845 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse()); | |
1846 | |
1847 if (delay > 0) { | |
1848 #ifndef PRODUCT | |
1849 if (_cfg->C->trace_opto_output()) | |
1850 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx); | |
1851 #endif | |
1852 return false; | |
1853 } | |
1854 | |
1855 #ifndef PRODUCT | |
1856 if (_cfg->C->trace_opto_output()) | |
1857 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx); | |
1858 #endif | |
1859 | |
1860 return true; | |
1861 } | |
1862 | |
1863 Node * Scheduling::ChooseNodeToBundle() { | |
1864 uint siz = _available.size(); | |
1865 | |
1866 if (siz == 0) { | |
1867 | |
1868 #ifndef PRODUCT | |
1869 if (_cfg->C->trace_opto_output()) | |
1870 tty->print("# ChooseNodeToBundle: NULL\n"); | |
1871 #endif | |
1872 return (NULL); | |
1873 } | |
1874 | |
1875 // Fast path, if only 1 instruction in the bundle | |
1876 if (siz == 1) { | |
1877 #ifndef PRODUCT | |
1878 if (_cfg->C->trace_opto_output()) { | |
1879 tty->print("# ChooseNodeToBundle (only 1): "); | |
1880 _available[0]->dump(); | |
1881 } | |
1882 #endif | |
1883 return (_available[0]); | |
1884 } | |
1885 | |
1886 // Don't bother, if the bundle is already full | |
1887 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) { | |
1888 for ( uint i = 0; i < siz; i++ ) { | |
1889 Node *n = _available[i]; | |
1890 | |
1891 // Skip projections, we'll handle them another way | |
1892 if (n->is_Proj()) | |
1893 continue; | |
1894 | |
1895 // This presupposed that instructions are inserted into the | |
1896 // available list in a legality order; i.e. instructions that | |
1897 // must be inserted first are at the head of the list | |
1898 if (NodeFitsInBundle(n)) { | |
1899 #ifndef PRODUCT | |
1900 if (_cfg->C->trace_opto_output()) { | |
1901 tty->print("# ChooseNodeToBundle: "); | |
1902 n->dump(); | |
1903 } | |
1904 #endif | |
1905 return (n); | |
1906 } | |
1907 } | |
1908 } | |
1909 | |
1910 // Nothing fits in this bundle, choose the highest priority | |
1911 #ifndef PRODUCT | |
1912 if (_cfg->C->trace_opto_output()) { | |
1913 tty->print("# ChooseNodeToBundle: "); | |
1914 _available[0]->dump(); | |
1915 } | |
1916 #endif | |
1917 | |
1918 return _available[0]; | |
1919 } | |
1920 | |
1921 //------------------------------AddNodeToAvailableList------------------------- | |
1922 void Scheduling::AddNodeToAvailableList(Node *n) { | |
1923 assert( !n->is_Proj(), "projections never directly made available" ); | |
1924 #ifndef PRODUCT | |
1925 if (_cfg->C->trace_opto_output()) { | |
1926 tty->print("# AddNodeToAvailableList: "); | |
1927 n->dump(); | |
1928 } | |
1929 #endif | |
1930 | |
1931 int latency = _current_latency[n->_idx]; | |
1932 | |
1933 // Insert in latency order (insertion sort) | |
1934 uint i; | |
1935 for ( i=0; i < _available.size(); i++ ) | |
1936 if (_current_latency[_available[i]->_idx] > latency) | |
1937 break; | |
1938 | |
1939 // Special Check for compares following branches | |
1940 if( n->is_Mach() && _scheduled.size() > 0 ) { | |
1941 int op = n->as_Mach()->ideal_Opcode(); | |
1942 Node *last = _scheduled[0]; | |
1943 if( last->is_MachIf() && last->in(1) == n && | |
1944 ( op == Op_CmpI || | |
1945 op == Op_CmpU || | |
1946 op == Op_CmpP || | |
1947 op == Op_CmpF || | |
1948 op == Op_CmpD || | |
1949 op == Op_CmpL ) ) { | |
1950 | |
1951 // Recalculate position, moving to front of same latency | |
1952 for ( i=0 ; i < _available.size(); i++ ) | |
1953 if (_current_latency[_available[i]->_idx] >= latency) | |
1954 break; | |
1955 } | |
1956 } | |
1957 | |
1958 // Insert the node in the available list | |
1959 _available.insert(i, n); | |
1960 | |
1961 #ifndef PRODUCT | |
1962 if (_cfg->C->trace_opto_output()) | |
1963 dump_available(); | |
1964 #endif | |
1965 } | |
1966 | |
1967 //------------------------------DecrementUseCounts----------------------------- | |
1968 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) { | |
1969 for ( uint i=0; i < n->len(); i++ ) { | |
1970 Node *def = n->in(i); | |
1971 if (!def) continue; | |
1972 if( def->is_Proj() ) // If this is a machine projection, then | |
1973 def = def->in(0); // propagate usage thru to the base instruction | |
1974 | |
1975 if( _bbs[def->_idx] != bb ) // Ignore if not block-local | |
1976 continue; | |
1977 | |
1978 // Compute the latency | |
1979 uint l = _bundle_cycle_number + n->latency(i); | |
1980 if (_current_latency[def->_idx] < l) | |
1981 _current_latency[def->_idx] = l; | |
1982 | |
1983 // If this does not have uses then schedule it | |
1984 if ((--_uses[def->_idx]) == 0) | |
1985 AddNodeToAvailableList(def); | |
1986 } | |
1987 } | |
1988 | |
1989 //------------------------------AddNodeToBundle-------------------------------- | |
1990 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) { | |
1991 #ifndef PRODUCT | |
1992 if (_cfg->C->trace_opto_output()) { | |
1993 tty->print("# AddNodeToBundle: "); | |
1994 n->dump(); | |
1995 } | |
1996 #endif | |
1997 | |
1998 // Remove this from the available list | |
1999 uint i; | |
2000 for (i = 0; i < _available.size(); i++) | |
2001 if (_available[i] == n) | |
2002 break; | |
2003 assert(i < _available.size(), "entry in _available list not found"); | |
2004 _available.remove(i); | |
2005 | |
2006 // See if this fits in the current bundle | |
2007 const Pipeline *node_pipeline = n->pipeline(); | |
2008 const Pipeline_Use& node_usage = node_pipeline->resourceUse(); | |
2009 | |
2010 // Check for instructions to be placed in the delay slot. We | |
2011 // do this before we actually schedule the current instruction, | |
2012 // because the delay slot follows the current instruction. | |
2013 if (Pipeline::_branch_has_delay_slot && | |
2014 node_pipeline->hasBranchDelay() && | |
2015 !_unconditional_delay_slot) { | |
2016 | |
2017 uint siz = _available.size(); | |
2018 | |
2019 // Conditional branches can support an instruction that | |
605 | 2020 // is unconditionally executed and not dependent by the |
0 | 2021 // branch, OR a conditionally executed instruction if |
2022 // the branch is taken. In practice, this means that | |
2023 // the first instruction at the branch target is | |
2024 // copied to the delay slot, and the branch goes to | |
2025 // the instruction after that at the branch target | |
2026 if ( n->is_Mach() && n->is_Branch() ) { | |
2027 | |
2028 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" ); | |
2029 assert( !n->is_Catch(), "should not look for delay slot for Catch" ); | |
2030 | |
2031 #ifndef PRODUCT | |
2032 _branches++; | |
2033 #endif | |
2034 | |
2035 // At least 1 instruction is on the available list | |
605 | 2036 // that is not dependent on the branch |
0 | 2037 for (uint i = 0; i < siz; i++) { |
2038 Node *d = _available[i]; | |
2039 const Pipeline *avail_pipeline = d->pipeline(); | |
2040 | |
2041 // Don't allow safepoints in the branch shadow, that will | |
2042 // cause a number of difficulties | |
2043 if ( avail_pipeline->instructionCount() == 1 && | |
2044 !avail_pipeline->hasMultipleBundles() && | |
2045 !avail_pipeline->hasBranchDelay() && | |
2046 Pipeline::instr_has_unit_size() && | |
2047 d->size(_regalloc) == Pipeline::instr_unit_size() && | |
2048 NodeFitsInBundle(d) && | |
2049 !node_bundling(d)->used_in_delay()) { | |
2050 | |
2051 if (d->is_Mach() && !d->is_MachSafePoint()) { | |
2052 // A node that fits in the delay slot was found, so we need to | |
2053 // set the appropriate bits in the bundle pipeline information so | |
2054 // that it correctly indicates resource usage. Later, when we | |
2055 // attempt to add this instruction to the bundle, we will skip | |
2056 // setting the resource usage. | |
2057 _unconditional_delay_slot = d; | |
2058 node_bundling(n)->set_use_unconditional_delay(); | |
2059 node_bundling(d)->set_used_in_unconditional_delay(); | |
2060 _bundle_use.add_usage(avail_pipeline->resourceUse()); | |
2061 _current_latency[d->_idx] = _bundle_cycle_number; | |
2062 _next_node = d; | |
2063 ++_bundle_instr_count; | |
2064 #ifndef PRODUCT | |
2065 _unconditional_delays++; | |
2066 #endif | |
2067 break; | |
2068 } | |
2069 } | |
2070 } | |
2071 } | |
2072 | |
2073 // No delay slot, add a nop to the usage | |
2074 if (!_unconditional_delay_slot) { | |
2075 // See if adding an instruction in the delay slot will overflow | |
2076 // the bundle. | |
2077 if (!NodeFitsInBundle(_nop)) { | |
2078 #ifndef PRODUCT | |
2079 if (_cfg->C->trace_opto_output()) | |
2080 tty->print("# *** STEP(1 instruction for delay slot) ***\n"); | |
2081 #endif | |
2082 step(1); | |
2083 } | |
2084 | |
2085 _bundle_use.add_usage(_nop->pipeline()->resourceUse()); | |
2086 _next_node = _nop; | |
2087 ++_bundle_instr_count; | |
2088 } | |
2089 | |
2090 // See if the instruction in the delay slot requires a | |
2091 // step of the bundles | |
2092 if (!NodeFitsInBundle(n)) { | |
2093 #ifndef PRODUCT | |
2094 if (_cfg->C->trace_opto_output()) | |
2095 tty->print("# *** STEP(branch won't fit) ***\n"); | |
2096 #endif | |
2097 // Update the state information | |
2098 _bundle_instr_count = 0; | |
2099 _bundle_cycle_number += 1; | |
2100 _bundle_use.step(1); | |
2101 } | |
2102 } | |
2103 | |
2104 // Get the number of instructions | |
2105 uint instruction_count = node_pipeline->instructionCount(); | |
2106 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
2107 instruction_count = 0; | |
2108 | |
2109 // Compute the latency information | |
2110 uint delay = 0; | |
2111 | |
2112 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) { | |
2113 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number; | |
2114 if (relative_latency < 0) | |
2115 relative_latency = 0; | |
2116 | |
2117 delay = _bundle_use.full_latency(relative_latency, node_usage); | |
2118 | |
2119 // Does not fit in this bundle, start a new one | |
2120 if (delay > 0) { | |
2121 step(delay); | |
2122 | |
2123 #ifndef PRODUCT | |
2124 if (_cfg->C->trace_opto_output()) | |
2125 tty->print("# *** STEP(%d) ***\n", delay); | |
2126 #endif | |
2127 } | |
2128 } | |
2129 | |
2130 // If this was placed in the delay slot, ignore it | |
2131 if (n != _unconditional_delay_slot) { | |
2132 | |
2133 if (delay == 0) { | |
2134 if (node_pipeline->hasMultipleBundles()) { | |
2135 #ifndef PRODUCT | |
2136 if (_cfg->C->trace_opto_output()) | |
2137 tty->print("# *** STEP(multiple instructions) ***\n"); | |
2138 #endif | |
2139 step(1); | |
2140 } | |
2141 | |
2142 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) { | |
2143 #ifndef PRODUCT | |
2144 if (_cfg->C->trace_opto_output()) | |
2145 tty->print("# *** STEP(%d >= %d instructions) ***\n", | |
2146 instruction_count + _bundle_instr_count, | |
2147 Pipeline::_max_instrs_per_cycle); | |
2148 #endif | |
2149 step(1); | |
2150 } | |
2151 } | |
2152 | |
2153 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
2154 _bundle_instr_count++; | |
2155 | |
2156 // Set the node's latency | |
2157 _current_latency[n->_idx] = _bundle_cycle_number; | |
2158 | |
2159 // Now merge the functional unit information | |
2160 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) | |
2161 _bundle_use.add_usage(node_usage); | |
2162 | |
2163 // Increment the number of instructions in this bundle | |
2164 _bundle_instr_count += instruction_count; | |
2165 | |
2166 // Remember this node for later | |
2167 if (n->is_Mach()) | |
2168 _next_node = n; | |
2169 } | |
2170 | |
2171 // It's possible to have a BoxLock in the graph and in the _bbs mapping but | |
2172 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks. | |
2173 // 'Schedule' them (basically ignore in the schedule) but do not insert them | |
2174 // into the block. All other scheduled nodes get put in the schedule here. | |
2175 int op = n->Opcode(); | |
2176 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR | |
2177 (op != Op_Node && // Not an unused antidepedence node and | |
2178 // not an unallocated boxlock | |
2179 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) { | |
2180 | |
2181 // Push any trailing projections | |
2182 if( bb->_nodes[bb->_nodes.size()-1] != n ) { | |
2183 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
2184 Node *foi = n->fast_out(i); | |
2185 if( foi->is_Proj() ) | |
2186 _scheduled.push(foi); | |
2187 } | |
2188 } | |
2189 | |
2190 // Put the instruction in the schedule list | |
2191 _scheduled.push(n); | |
2192 } | |
2193 | |
2194 #ifndef PRODUCT | |
2195 if (_cfg->C->trace_opto_output()) | |
2196 dump_available(); | |
2197 #endif | |
2198 | |
2199 // Walk all the definitions, decrementing use counts, and | |
2200 // if a definition has a 0 use count, place it in the available list. | |
2201 DecrementUseCounts(n,bb); | |
2202 } | |
2203 | |
2204 //------------------------------ComputeUseCount-------------------------------- | |
2205 // This method sets the use count within a basic block. We will ignore all | |
2206 // uses outside the current basic block. As we are doing a backwards walk, | |
2207 // any node we reach that has a use count of 0 may be scheduled. This also | |
2208 // avoids the problem of cyclic references from phi nodes, as long as phi | |
2209 // nodes are at the front of the basic block. This method also initializes | |
2210 // the available list to the set of instructions that have no uses within this | |
2211 // basic block. | |
2212 void Scheduling::ComputeUseCount(const Block *bb) { | |
2213 #ifndef PRODUCT | |
2214 if (_cfg->C->trace_opto_output()) | |
2215 tty->print("# -> ComputeUseCount\n"); | |
2216 #endif | |
2217 | |
2218 // Clear the list of available and scheduled instructions, just in case | |
2219 _available.clear(); | |
2220 _scheduled.clear(); | |
2221 | |
2222 // No delay slot specified | |
2223 _unconditional_delay_slot = NULL; | |
2224 | |
2225 #ifdef ASSERT | |
2226 for( uint i=0; i < bb->_nodes.size(); i++ ) | |
2227 assert( _uses[bb->_nodes[i]->_idx] == 0, "_use array not clean" ); | |
2228 #endif | |
2229 | |
2230 // Force the _uses count to never go to zero for unscheduable pieces | |
2231 // of the block | |
2232 for( uint k = 0; k < _bb_start; k++ ) | |
2233 _uses[bb->_nodes[k]->_idx] = 1; | |
2234 for( uint l = _bb_end; l < bb->_nodes.size(); l++ ) | |
2235 _uses[bb->_nodes[l]->_idx] = 1; | |
2236 | |
2237 // Iterate backwards over the instructions in the block. Don't count the | |
2238 // branch projections at end or the block header instructions. | |
2239 for( uint j = _bb_end-1; j >= _bb_start; j-- ) { | |
2240 Node *n = bb->_nodes[j]; | |
2241 if( n->is_Proj() ) continue; // Projections handled another way | |
2242 | |
2243 // Account for all uses | |
2244 for ( uint k = 0; k < n->len(); k++ ) { | |
2245 Node *inp = n->in(k); | |
2246 if (!inp) continue; | |
2247 assert(inp != n, "no cycles allowed" ); | |
2248 if( _bbs[inp->_idx] == bb ) { // Block-local use? | |
2249 if( inp->is_Proj() ) // Skip through Proj's | |
2250 inp = inp->in(0); | |
2251 ++_uses[inp->_idx]; // Count 1 block-local use | |
2252 } | |
2253 } | |
2254 | |
2255 // If this instruction has a 0 use count, then it is available | |
2256 if (!_uses[n->_idx]) { | |
2257 _current_latency[n->_idx] = _bundle_cycle_number; | |
2258 AddNodeToAvailableList(n); | |
2259 } | |
2260 | |
2261 #ifndef PRODUCT | |
2262 if (_cfg->C->trace_opto_output()) { | |
2263 tty->print("# uses: %3d: ", _uses[n->_idx]); | |
2264 n->dump(); | |
2265 } | |
2266 #endif | |
2267 } | |
2268 | |
2269 #ifndef PRODUCT | |
2270 if (_cfg->C->trace_opto_output()) | |
2271 tty->print("# <- ComputeUseCount\n"); | |
2272 #endif | |
2273 } | |
2274 | |
2275 // This routine performs scheduling on each basic block in reverse order, | |
2276 // using instruction latencies and taking into account function unit | |
2277 // availability. | |
2278 void Scheduling::DoScheduling() { | |
2279 #ifndef PRODUCT | |
2280 if (_cfg->C->trace_opto_output()) | |
2281 tty->print("# -> DoScheduling\n"); | |
2282 #endif | |
2283 | |
2284 Block *succ_bb = NULL; | |
2285 Block *bb; | |
2286 | |
2287 // Walk over all the basic blocks in reverse order | |
2288 for( int i=_cfg->_num_blocks-1; i >= 0; succ_bb = bb, i-- ) { | |
2289 bb = _cfg->_blocks[i]; | |
2290 | |
2291 #ifndef PRODUCT | |
2292 if (_cfg->C->trace_opto_output()) { | |
2293 tty->print("# Schedule BB#%03d (initial)\n", i); | |
2294 for (uint j = 0; j < bb->_nodes.size(); j++) | |
2295 bb->_nodes[j]->dump(); | |
2296 } | |
2297 #endif | |
2298 | |
2299 // On the head node, skip processing | |
2300 if( bb == _cfg->_broot ) | |
2301 continue; | |
2302 | |
2303 // Skip empty, connector blocks | |
2304 if (bb->is_connector()) | |
2305 continue; | |
2306 | |
2307 // If the following block is not the sole successor of | |
2308 // this one, then reset the pipeline information | |
2309 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) { | |
2310 #ifndef PRODUCT | |
2311 if (_cfg->C->trace_opto_output()) { | |
2312 tty->print("*** bundle start of next BB, node %d, for %d instructions\n", | |
2313 _next_node->_idx, _bundle_instr_count); | |
2314 } | |
2315 #endif | |
2316 step_and_clear(); | |
2317 } | |
2318 | |
2319 // Leave untouched the starting instruction, any Phis, a CreateEx node | |
2320 // or Top. bb->_nodes[_bb_start] is the first schedulable instruction. | |
2321 _bb_end = bb->_nodes.size()-1; | |
2322 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) { | |
2323 Node *n = bb->_nodes[_bb_start]; | |
2324 // Things not matched, like Phinodes and ProjNodes don't get scheduled. | |
2325 // Also, MachIdealNodes do not get scheduled | |
2326 if( !n->is_Mach() ) continue; // Skip non-machine nodes | |
2327 MachNode *mach = n->as_Mach(); | |
2328 int iop = mach->ideal_Opcode(); | |
2329 if( iop == Op_CreateEx ) continue; // CreateEx is pinned | |
2330 if( iop == Op_Con ) continue; // Do not schedule Top | |
2331 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes | |
2332 mach->pipeline() == MachNode::pipeline_class() && | |
2333 !n->is_SpillCopy() ) // Breakpoints, Prolog, etc | |
2334 continue; | |
2335 break; // Funny loop structure to be sure... | |
2336 } | |
2337 // Compute last "interesting" instruction in block - last instruction we | |
2338 // might schedule. _bb_end points just after last schedulable inst. We | |
2339 // normally schedule conditional branches (despite them being forced last | |
2340 // in the block), because they have delay slots we can fill. Calls all | |
2341 // have their delay slots filled in the template expansions, so we don't | |
2342 // bother scheduling them. | |
2343 Node *last = bb->_nodes[_bb_end]; | |
2344 if( last->is_Catch() || | |
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2345 // Exclude unreachable path case when Halt node is in a separate block. |
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2346 (_bb_end > 1 && last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) { |
0 | 2347 // There must be a prior call. Skip it. |
2348 while( !bb->_nodes[--_bb_end]->is_Call() ) { | |
2349 assert( bb->_nodes[_bb_end]->is_Proj(), "skipping projections after expected call" ); | |
2350 } | |
2351 } else if( last->is_MachNullCheck() ) { | |
2352 // Backup so the last null-checked memory instruction is | |
2353 // outside the schedulable range. Skip over the nullcheck, | |
2354 // projection, and the memory nodes. | |
2355 Node *mem = last->in(1); | |
2356 do { | |
2357 _bb_end--; | |
2358 } while (mem != bb->_nodes[_bb_end]); | |
2359 } else { | |
2360 // Set _bb_end to point after last schedulable inst. | |
2361 _bb_end++; | |
2362 } | |
2363 | |
2364 assert( _bb_start <= _bb_end, "inverted block ends" ); | |
2365 | |
2366 // Compute the register antidependencies for the basic block | |
2367 ComputeRegisterAntidependencies(bb); | |
2368 if (_cfg->C->failing()) return; // too many D-U pinch points | |
2369 | |
2370 // Compute intra-bb latencies for the nodes | |
2371 ComputeLocalLatenciesForward(bb); | |
2372 | |
2373 // Compute the usage within the block, and set the list of all nodes | |
2374 // in the block that have no uses within the block. | |
2375 ComputeUseCount(bb); | |
2376 | |
2377 // Schedule the remaining instructions in the block | |
2378 while ( _available.size() > 0 ) { | |
2379 Node *n = ChooseNodeToBundle(); | |
2380 AddNodeToBundle(n,bb); | |
2381 } | |
2382 | |
2383 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" ); | |
2384 #ifdef ASSERT | |
2385 for( uint l = _bb_start; l < _bb_end; l++ ) { | |
2386 Node *n = bb->_nodes[l]; | |
2387 uint m; | |
2388 for( m = 0; m < _bb_end-_bb_start; m++ ) | |
2389 if( _scheduled[m] == n ) | |
2390 break; | |
2391 assert( m < _bb_end-_bb_start, "instruction missing in schedule" ); | |
2392 } | |
2393 #endif | |
2394 | |
2395 // Now copy the instructions (in reverse order) back to the block | |
2396 for ( uint k = _bb_start; k < _bb_end; k++ ) | |
2397 bb->_nodes.map(k, _scheduled[_bb_end-k-1]); | |
2398 | |
2399 #ifndef PRODUCT | |
2400 if (_cfg->C->trace_opto_output()) { | |
2401 tty->print("# Schedule BB#%03d (final)\n", i); | |
2402 uint current = 0; | |
2403 for (uint j = 0; j < bb->_nodes.size(); j++) { | |
2404 Node *n = bb->_nodes[j]; | |
2405 if( valid_bundle_info(n) ) { | |
2406 Bundle *bundle = node_bundling(n); | |
2407 if (bundle->instr_count() > 0 || bundle->flags() > 0) { | |
2408 tty->print("*** Bundle: "); | |
2409 bundle->dump(); | |
2410 } | |
2411 n->dump(); | |
2412 } | |
2413 } | |
2414 } | |
2415 #endif | |
2416 #ifdef ASSERT | |
2417 verify_good_schedule(bb,"after block local scheduling"); | |
2418 #endif | |
2419 } | |
2420 | |
2421 #ifndef PRODUCT | |
2422 if (_cfg->C->trace_opto_output()) | |
2423 tty->print("# <- DoScheduling\n"); | |
2424 #endif | |
2425 | |
2426 // Record final node-bundling array location | |
2427 _regalloc->C->set_node_bundling_base(_node_bundling_base); | |
2428 | |
2429 } // end DoScheduling | |
2430 | |
2431 //------------------------------verify_good_schedule--------------------------- | |
2432 // Verify that no live-range used in the block is killed in the block by a | |
2433 // wrong DEF. This doesn't verify live-ranges that span blocks. | |
2434 | |
2435 // Check for edge existence. Used to avoid adding redundant precedence edges. | |
2436 static bool edge_from_to( Node *from, Node *to ) { | |
2437 for( uint i=0; i<from->len(); i++ ) | |
2438 if( from->in(i) == to ) | |
2439 return true; | |
2440 return false; | |
2441 } | |
2442 | |
2443 #ifdef ASSERT | |
2444 //------------------------------verify_do_def---------------------------------- | |
2445 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) { | |
2446 // Check for bad kills | |
2447 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow | |
2448 Node *prior_use = _reg_node[def]; | |
2449 if( prior_use && !edge_from_to(prior_use,n) ) { | |
2450 tty->print("%s = ",OptoReg::as_VMReg(def)->name()); | |
2451 n->dump(); | |
2452 tty->print_cr("..."); | |
2453 prior_use->dump(); | |
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2454 assert(edge_from_to(prior_use,n),msg); |
0 | 2455 } |
2456 _reg_node.map(def,NULL); // Kill live USEs | |
2457 } | |
2458 } | |
2459 | |
2460 //------------------------------verify_good_schedule--------------------------- | |
2461 void Scheduling::verify_good_schedule( Block *b, const char *msg ) { | |
2462 | |
2463 // Zap to something reasonable for the verify code | |
2464 _reg_node.clear(); | |
2465 | |
2466 // Walk over the block backwards. Check to make sure each DEF doesn't | |
2467 // kill a live value (other than the one it's supposed to). Add each | |
2468 // USE to the live set. | |
2469 for( uint i = b->_nodes.size()-1; i >= _bb_start; i-- ) { | |
2470 Node *n = b->_nodes[i]; | |
2471 int n_op = n->Opcode(); | |
2472 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
2473 // Fat-proj kills a slew of registers | |
2474 RegMask rm = n->out_RegMask();// Make local copy | |
2475 while( rm.is_NotEmpty() ) { | |
2476 OptoReg::Name kill = rm.find_first_elem(); | |
2477 rm.Remove(kill); | |
2478 verify_do_def( n, kill, msg ); | |
2479 } | |
2480 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes | |
2481 // Get DEF'd registers the normal way | |
2482 verify_do_def( n, _regalloc->get_reg_first(n), msg ); | |
2483 verify_do_def( n, _regalloc->get_reg_second(n), msg ); | |
2484 } | |
2485 | |
2486 // Now make all USEs live | |
2487 for( uint i=1; i<n->req(); i++ ) { | |
2488 Node *def = n->in(i); | |
2489 assert(def != 0, "input edge required"); | |
2490 OptoReg::Name reg_lo = _regalloc->get_reg_first(def); | |
2491 OptoReg::Name reg_hi = _regalloc->get_reg_second(def); | |
2492 if( OptoReg::is_valid(reg_lo) ) { | |
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2493 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), msg); |
0 | 2494 _reg_node.map(reg_lo,n); |
2495 } | |
2496 if( OptoReg::is_valid(reg_hi) ) { | |
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2497 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), msg); |
0 | 2498 _reg_node.map(reg_hi,n); |
2499 } | |
2500 } | |
2501 | |
2502 } | |
2503 | |
2504 // Zap to something reasonable for the Antidependence code | |
2505 _reg_node.clear(); | |
2506 } | |
2507 #endif | |
2508 | |
2509 // Conditionally add precedence edges. Avoid putting edges on Projs. | |
2510 static void add_prec_edge_from_to( Node *from, Node *to ) { | |
2511 if( from->is_Proj() ) { // Put precedence edge on Proj's input | |
2512 assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" ); | |
2513 from = from->in(0); | |
2514 } | |
2515 if( from != to && // No cycles (for things like LD L0,[L0+4] ) | |
2516 !edge_from_to( from, to ) ) // Avoid duplicate edge | |
2517 from->add_prec(to); | |
2518 } | |
2519 | |
2520 //------------------------------anti_do_def------------------------------------ | |
2521 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) { | |
2522 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow | |
2523 return; | |
2524 | |
2525 Node *pinch = _reg_node[def_reg]; // Get pinch point | |
2526 if( !pinch || _bbs[pinch->_idx] != b || // No pinch-point yet? | |
2527 is_def ) { // Check for a true def (not a kill) | |
2528 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point | |
2529 return; | |
2530 } | |
2531 | |
2532 Node *kill = def; // Rename 'def' to more descriptive 'kill' | |
2533 debug_only( def = (Node*)0xdeadbeef; ) | |
2534 | |
2535 // After some number of kills there _may_ be a later def | |
2536 Node *later_def = NULL; | |
2537 | |
2538 // Finding a kill requires a real pinch-point. | |
2539 // Check for not already having a pinch-point. | |
2540 // Pinch points are Op_Node's. | |
2541 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point? | |
2542 later_def = pinch; // Must be def/kill as optimistic pinch-point | |
2543 if ( _pinch_free_list.size() > 0) { | |
2544 pinch = _pinch_free_list.pop(); | |
2545 } else { | |
2546 pinch = new (_cfg->C, 1) Node(1); // Pinch point to-be | |
2547 } | |
2548 if (pinch->_idx >= _regalloc->node_regs_max_index()) { | |
2549 _cfg->C->record_method_not_compilable("too many D-U pinch points"); | |
2550 return; | |
2551 } | |
2552 _bbs.map(pinch->_idx,b); // Pretend it's valid in this block (lazy init) | |
2553 _reg_node.map(def_reg,pinch); // Record pinch-point | |
2554 //_regalloc->set_bad(pinch->_idx); // Already initialized this way. | |
2555 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill | |
2556 pinch->init_req(0, _cfg->C->top()); // set not NULL for the next call | |
2557 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch | |
2558 later_def = NULL; // and no later def | |
2559 } | |
2560 pinch->set_req(0,later_def); // Hook later def so we can find it | |
2561 } else { // Else have valid pinch point | |
2562 if( pinch->in(0) ) // If there is a later-def | |
2563 later_def = pinch->in(0); // Get it | |
2564 } | |
2565 | |
2566 // Add output-dependence edge from later def to kill | |
2567 if( later_def ) // If there is some original def | |
2568 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill | |
2569 | |
2570 // See if current kill is also a use, and so is forced to be the pinch-point. | |
2571 if( pinch->Opcode() == Op_Node ) { | |
2572 Node *uses = kill->is_Proj() ? kill->in(0) : kill; | |
2573 for( uint i=1; i<uses->req(); i++ ) { | |
2574 if( _regalloc->get_reg_first(uses->in(i)) == def_reg || | |
2575 _regalloc->get_reg_second(uses->in(i)) == def_reg ) { | |
2576 // Yes, found a use/kill pinch-point | |
2577 pinch->set_req(0,NULL); // | |
2578 pinch->replace_by(kill); // Move anti-dep edges up | |
2579 pinch = kill; | |
2580 _reg_node.map(def_reg,pinch); | |
2581 return; | |
2582 } | |
2583 } | |
2584 } | |
2585 | |
2586 // Add edge from kill to pinch-point | |
2587 add_prec_edge_from_to(kill,pinch); | |
2588 } | |
2589 | |
2590 //------------------------------anti_do_use------------------------------------ | |
2591 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) { | |
2592 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow | |
2593 return; | |
2594 Node *pinch = _reg_node[use_reg]; // Get pinch point | |
2595 // Check for no later def_reg/kill in block | |
2596 if( pinch && _bbs[pinch->_idx] == b && | |
2597 // Use has to be block-local as well | |
2598 _bbs[use->_idx] == b ) { | |
2599 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?) | |
2600 pinch->req() == 1 ) { // pinch not yet in block? | |
2601 pinch->del_req(0); // yank pointer to later-def, also set flag | |
2602 // Insert the pinch-point in the block just after the last use | |
2603 b->_nodes.insert(b->find_node(use)+1,pinch); | |
2604 _bb_end++; // Increase size scheduled region in block | |
2605 } | |
2606 | |
2607 add_prec_edge_from_to(pinch,use); | |
2608 } | |
2609 } | |
2610 | |
2611 //------------------------------ComputeRegisterAntidependences----------------- | |
2612 // We insert antidependences between the reads and following write of | |
2613 // allocated registers to prevent illegal code motion. Hopefully, the | |
2614 // number of added references should be fairly small, especially as we | |
2615 // are only adding references within the current basic block. | |
2616 void Scheduling::ComputeRegisterAntidependencies(Block *b) { | |
2617 | |
2618 #ifdef ASSERT | |
2619 verify_good_schedule(b,"before block local scheduling"); | |
2620 #endif | |
2621 | |
2622 // A valid schedule, for each register independently, is an endless cycle | |
2623 // of: a def, then some uses (connected to the def by true dependencies), | |
2624 // then some kills (defs with no uses), finally the cycle repeats with a new | |
2625 // def. The uses are allowed to float relative to each other, as are the | |
2626 // kills. No use is allowed to slide past a kill (or def). This requires | |
2627 // antidependencies between all uses of a single def and all kills that | |
2628 // follow, up to the next def. More edges are redundant, because later defs | |
2629 // & kills are already serialized with true or antidependencies. To keep | |
2630 // the edge count down, we add a 'pinch point' node if there's more than | |
2631 // one use or more than one kill/def. | |
2632 | |
2633 // We add dependencies in one bottom-up pass. | |
2634 | |
2635 // For each instruction we handle it's DEFs/KILLs, then it's USEs. | |
2636 | |
2637 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this | |
2638 // register. If not, we record the DEF/KILL in _reg_node, the | |
2639 // register-to-def mapping. If there is a prior DEF/KILL, we insert a | |
2640 // "pinch point", a new Node that's in the graph but not in the block. | |
2641 // We put edges from the prior and current DEF/KILLs to the pinch point. | |
2642 // We put the pinch point in _reg_node. If there's already a pinch point | |
2643 // we merely add an edge from the current DEF/KILL to the pinch point. | |
2644 | |
2645 // After doing the DEF/KILLs, we handle USEs. For each used register, we | |
2646 // put an edge from the pinch point to the USE. | |
2647 | |
2648 // To be expedient, the _reg_node array is pre-allocated for the whole | |
2649 // compilation. _reg_node is lazily initialized; it either contains a NULL, | |
2650 // or a valid def/kill/pinch-point, or a leftover node from some prior | |
2651 // block. Leftover node from some prior block is treated like a NULL (no | |
2652 // prior def, so no anti-dependence needed). Valid def is distinguished by | |
2653 // it being in the current block. | |
2654 bool fat_proj_seen = false; | |
2655 uint last_safept = _bb_end-1; | |
2656 Node* end_node = (_bb_end-1 >= _bb_start) ? b->_nodes[last_safept] : NULL; | |
2657 Node* last_safept_node = end_node; | |
2658 for( uint i = _bb_end-1; i >= _bb_start; i-- ) { | |
2659 Node *n = b->_nodes[i]; | |
2660 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges | |
2661 if( n->Opcode() == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
2662 // Fat-proj kills a slew of registers | |
2663 // This can add edges to 'n' and obscure whether or not it was a def, | |
2664 // hence the is_def flag. | |
2665 fat_proj_seen = true; | |
2666 RegMask rm = n->out_RegMask();// Make local copy | |
2667 while( rm.is_NotEmpty() ) { | |
2668 OptoReg::Name kill = rm.find_first_elem(); | |
2669 rm.Remove(kill); | |
2670 anti_do_def( b, n, kill, is_def ); | |
2671 } | |
2672 } else { | |
2673 // Get DEF'd registers the normal way | |
2674 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def ); | |
2675 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def ); | |
2676 } | |
2677 | |
2678 // Check each register used by this instruction for a following DEF/KILL | |
2679 // that must occur afterward and requires an anti-dependence edge. | |
2680 for( uint j=0; j<n->req(); j++ ) { | |
2681 Node *def = n->in(j); | |
2682 if( def ) { | |
2683 assert( def->Opcode() != Op_MachProj || def->ideal_reg() != MachProjNode::fat_proj, "" ); | |
2684 anti_do_use( b, n, _regalloc->get_reg_first(def) ); | |
2685 anti_do_use( b, n, _regalloc->get_reg_second(def) ); | |
2686 } | |
2687 } | |
2688 // Do not allow defs of new derived values to float above GC | |
2689 // points unless the base is definitely available at the GC point. | |
2690 | |
2691 Node *m = b->_nodes[i]; | |
2692 | |
2693 // Add precedence edge from following safepoint to use of derived pointer | |
2694 if( last_safept_node != end_node && | |
2695 m != last_safept_node) { | |
2696 for (uint k = 1; k < m->req(); k++) { | |
2697 const Type *t = m->in(k)->bottom_type(); | |
2698 if( t->isa_oop_ptr() && | |
2699 t->is_ptr()->offset() != 0 ) { | |
2700 last_safept_node->add_prec( m ); | |
2701 break; | |
2702 } | |
2703 } | |
2704 } | |
2705 | |
2706 if( n->jvms() ) { // Precedence edge from derived to safept | |
2707 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use() | |
2708 if( b->_nodes[last_safept] != last_safept_node ) { | |
2709 last_safept = b->find_node(last_safept_node); | |
2710 } | |
2711 for( uint j=last_safept; j > i; j-- ) { | |
2712 Node *mach = b->_nodes[j]; | |
2713 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP ) | |
2714 mach->add_prec( n ); | |
2715 } | |
2716 last_safept = i; | |
2717 last_safept_node = m; | |
2718 } | |
2719 } | |
2720 | |
2721 if (fat_proj_seen) { | |
2722 // Garbage collect pinch nodes that were not consumed. | |
2723 // They are usually created by a fat kill MachProj for a call. | |
2724 garbage_collect_pinch_nodes(); | |
2725 } | |
2726 } | |
2727 | |
2728 //------------------------------garbage_collect_pinch_nodes------------------------------- | |
2729 | |
2730 // Garbage collect pinch nodes for reuse by other blocks. | |
2731 // | |
2732 // The block scheduler's insertion of anti-dependence | |
2733 // edges creates many pinch nodes when the block contains | |
2734 // 2 or more Calls. A pinch node is used to prevent a | |
2735 // combinatorial explosion of edges. If a set of kills for a | |
2736 // register is anti-dependent on a set of uses (or defs), rather | |
2737 // than adding an edge in the graph between each pair of kill | |
2738 // and use (or def), a pinch is inserted between them: | |
2739 // | |
2740 // use1 use2 use3 | |
2741 // \ | / | |
2742 // \ | / | |
2743 // pinch | |
2744 // / | \ | |
2745 // / | \ | |
2746 // kill1 kill2 kill3 | |
2747 // | |
2748 // One pinch node is created per register killed when | |
2749 // the second call is encountered during a backwards pass | |
2750 // over the block. Most of these pinch nodes are never | |
2751 // wired into the graph because the register is never | |
2752 // used or def'ed in the block. | |
2753 // | |
2754 void Scheduling::garbage_collect_pinch_nodes() { | |
2755 #ifndef PRODUCT | |
2756 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:"); | |
2757 #endif | |
2758 int trace_cnt = 0; | |
2759 for (uint k = 0; k < _reg_node.Size(); k++) { | |
2760 Node* pinch = _reg_node[k]; | |
2761 if (pinch != NULL && pinch->Opcode() == Op_Node && | |
2762 // no predecence input edges | |
2763 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) { | |
2764 cleanup_pinch(pinch); | |
2765 _pinch_free_list.push(pinch); | |
2766 _reg_node.map(k, NULL); | |
2767 #ifndef PRODUCT | |
2768 if (_cfg->C->trace_opto_output()) { | |
2769 trace_cnt++; | |
2770 if (trace_cnt > 40) { | |
2771 tty->print("\n"); | |
2772 trace_cnt = 0; | |
2773 } | |
2774 tty->print(" %d", pinch->_idx); | |
2775 } | |
2776 #endif | |
2777 } | |
2778 } | |
2779 #ifndef PRODUCT | |
2780 if (_cfg->C->trace_opto_output()) tty->print("\n"); | |
2781 #endif | |
2782 } | |
2783 | |
2784 // Clean up a pinch node for reuse. | |
2785 void Scheduling::cleanup_pinch( Node *pinch ) { | |
2786 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking"); | |
2787 | |
2788 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) { | |
2789 Node* use = pinch->last_out(i); | |
2790 uint uses_found = 0; | |
2791 for (uint j = use->req(); j < use->len(); j++) { | |
2792 if (use->in(j) == pinch) { | |
2793 use->rm_prec(j); | |
2794 uses_found++; | |
2795 } | |
2796 } | |
2797 assert(uses_found > 0, "must be a precedence edge"); | |
2798 i -= uses_found; // we deleted 1 or more copies of this edge | |
2799 } | |
2800 // May have a later_def entry | |
2801 pinch->set_req(0, NULL); | |
2802 } | |
2803 | |
2804 //------------------------------print_statistics------------------------------- | |
2805 #ifndef PRODUCT | |
2806 | |
2807 void Scheduling::dump_available() const { | |
2808 tty->print("#Availist "); | |
2809 for (uint i = 0; i < _available.size(); i++) | |
2810 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]); | |
2811 tty->cr(); | |
2812 } | |
2813 | |
2814 // Print Scheduling Statistics | |
2815 void Scheduling::print_statistics() { | |
2816 // Print the size added by nops for bundling | |
2817 tty->print("Nops added %d bytes to total of %d bytes", | |
2818 _total_nop_size, _total_method_size); | |
2819 if (_total_method_size > 0) | |
2820 tty->print(", for %.2f%%", | |
2821 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0); | |
2822 tty->print("\n"); | |
2823 | |
2824 // Print the number of branch shadows filled | |
2825 if (Pipeline::_branch_has_delay_slot) { | |
2826 tty->print("Of %d branches, %d had unconditional delay slots filled", | |
2827 _total_branches, _total_unconditional_delays); | |
2828 if (_total_branches > 0) | |
2829 tty->print(", for %.2f%%", | |
2830 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0); | |
2831 tty->print("\n"); | |
2832 } | |
2833 | |
2834 uint total_instructions = 0, total_bundles = 0; | |
2835 | |
2836 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) { | |
2837 uint bundle_count = _total_instructions_per_bundle[i]; | |
2838 total_instructions += bundle_count * i; | |
2839 total_bundles += bundle_count; | |
2840 } | |
2841 | |
2842 if (total_bundles > 0) | |
2843 tty->print("Average ILP (excluding nops) is %.2f\n", | |
2844 ((double)total_instructions) / ((double)total_bundles)); | |
2845 } | |
2846 #endif |