Mercurial > hg > graal-compiler
annotate src/share/vm/opto/output.cpp @ 584:49a36a80b0c7
6802499: EA: assert(false,"unknown node on this path")
Summary: Add missing checks for SCMemProj node in Escape analysis code.
Reviewed-by: never
author | kvn |
---|---|
date | Thu, 19 Feb 2009 17:38:53 -0800 |
parents | 424f9bfe6b96 |
children | 98cb887364d3 |
rev | line source |
---|---|
0 | 1 /* |
196 | 2 * Copyright 1998-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_output.cpp.incl" | |
27 | |
28 extern uint size_java_to_interp(); | |
29 extern uint reloc_java_to_interp(); | |
30 extern uint size_exception_handler(); | |
31 extern uint size_deopt_handler(); | |
32 | |
33 #ifndef PRODUCT | |
34 #define DEBUG_ARG(x) , x | |
35 #else | |
36 #define DEBUG_ARG(x) | |
37 #endif | |
38 | |
39 extern int emit_exception_handler(CodeBuffer &cbuf); | |
40 extern int emit_deopt_handler(CodeBuffer &cbuf); | |
41 | |
42 //------------------------------Output----------------------------------------- | |
43 // Convert Nodes to instruction bits and pass off to the VM | |
44 void Compile::Output() { | |
45 // RootNode goes | |
46 assert( _cfg->_broot->_nodes.size() == 0, "" ); | |
47 | |
48 // Initialize the space for the BufferBlob used to find and verify | |
49 // instruction size in MachNode::emit_size() | |
50 init_scratch_buffer_blob(); | |
163 | 51 if (failing()) return; // Out of memory |
0 | 52 |
53 // Make sure I can find the Start Node | |
54 Block_Array& bbs = _cfg->_bbs; | |
55 Block *entry = _cfg->_blocks[1]; | |
56 Block *broot = _cfg->_broot; | |
57 | |
58 const StartNode *start = entry->_nodes[0]->as_Start(); | |
59 | |
60 // Replace StartNode with prolog | |
61 MachPrologNode *prolog = new (this) MachPrologNode(); | |
62 entry->_nodes.map( 0, prolog ); | |
63 bbs.map( prolog->_idx, entry ); | |
64 bbs.map( start->_idx, NULL ); // start is no longer in any block | |
65 | |
66 // Virtual methods need an unverified entry point | |
67 | |
68 if( is_osr_compilation() ) { | |
69 if( PoisonOSREntry ) { | |
70 // TODO: Should use a ShouldNotReachHereNode... | |
71 _cfg->insert( broot, 0, new (this) MachBreakpointNode() ); | |
72 } | |
73 } else { | |
74 if( _method && !_method->flags().is_static() ) { | |
75 // Insert unvalidated entry point | |
76 _cfg->insert( broot, 0, new (this) MachUEPNode() ); | |
77 } | |
78 | |
79 } | |
80 | |
81 | |
82 // Break before main entry point | |
83 if( (_method && _method->break_at_execute()) | |
84 #ifndef PRODUCT | |
85 ||(OptoBreakpoint && is_method_compilation()) | |
86 ||(OptoBreakpointOSR && is_osr_compilation()) | |
87 ||(OptoBreakpointC2R && !_method) | |
88 #endif | |
89 ) { | |
90 // checking for _method means that OptoBreakpoint does not apply to | |
91 // runtime stubs or frame converters | |
92 _cfg->insert( entry, 1, new (this) MachBreakpointNode() ); | |
93 } | |
94 | |
95 // Insert epilogs before every return | |
96 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
97 Block *b = _cfg->_blocks[i]; | |
98 if( !b->is_connector() && b->non_connector_successor(0) == _cfg->_broot ) { // Found a program exit point? | |
99 Node *m = b->end(); | |
100 if( m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt ) { | |
101 MachEpilogNode *epilog = new (this) MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return); | |
102 b->add_inst( epilog ); | |
103 bbs.map(epilog->_idx, b); | |
104 //_regalloc->set_bad(epilog->_idx); // Already initialized this way. | |
105 } | |
106 } | |
107 } | |
108 | |
109 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
110 if ( ZapDeadCompiledLocals ) Insert_zap_nodes(); | |
111 # endif | |
112 | |
113 ScheduleAndBundle(); | |
114 | |
115 #ifndef PRODUCT | |
116 if (trace_opto_output()) { | |
117 tty->print("\n---- After ScheduleAndBundle ----\n"); | |
118 for (uint i = 0; i < _cfg->_num_blocks; i++) { | |
119 tty->print("\nBB#%03d:\n", i); | |
120 Block *bb = _cfg->_blocks[i]; | |
121 for (uint j = 0; j < bb->_nodes.size(); j++) { | |
122 Node *n = bb->_nodes[j]; | |
123 OptoReg::Name reg = _regalloc->get_reg_first(n); | |
124 tty->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : ""); | |
125 n->dump(); | |
126 } | |
127 } | |
128 } | |
129 #endif | |
130 | |
131 if (failing()) return; | |
132 | |
133 BuildOopMaps(); | |
134 | |
135 if (failing()) return; | |
136 | |
137 Fill_buffer(); | |
138 } | |
139 | |
140 bool Compile::need_stack_bang(int frame_size_in_bytes) const { | |
141 // Determine if we need to generate a stack overflow check. | |
142 // Do it if the method is not a stub function and | |
143 // has java calls or has frame size > vm_page_size/8. | |
144 return (stub_function() == NULL && | |
145 (has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3)); | |
146 } | |
147 | |
148 bool Compile::need_register_stack_bang() const { | |
149 // Determine if we need to generate a register stack overflow check. | |
150 // This is only used on architectures which have split register | |
151 // and memory stacks (ie. IA64). | |
152 // Bang if the method is not a stub function and has java calls | |
153 return (stub_function() == NULL && has_java_calls()); | |
154 } | |
155 | |
156 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
157 | |
158 | |
159 // In order to catch compiler oop-map bugs, we have implemented | |
160 // a debugging mode called ZapDeadCompilerLocals. | |
161 // This mode causes the compiler to insert a call to a runtime routine, | |
162 // "zap_dead_locals", right before each place in compiled code | |
163 // that could potentially be a gc-point (i.e., a safepoint or oop map point). | |
164 // The runtime routine checks that locations mapped as oops are really | |
165 // oops, that locations mapped as values do not look like oops, | |
166 // and that locations mapped as dead are not used later | |
167 // (by zapping them to an invalid address). | |
168 | |
169 int Compile::_CompiledZap_count = 0; | |
170 | |
171 void Compile::Insert_zap_nodes() { | |
172 bool skip = false; | |
173 | |
174 | |
175 // Dink with static counts because code code without the extra | |
176 // runtime calls is MUCH faster for debugging purposes | |
177 | |
178 if ( CompileZapFirst == 0 ) ; // nothing special | |
179 else if ( CompileZapFirst > CompiledZap_count() ) skip = true; | |
180 else if ( CompileZapFirst == CompiledZap_count() ) | |
181 warning("starting zap compilation after skipping"); | |
182 | |
183 if ( CompileZapLast == -1 ) ; // nothing special | |
184 else if ( CompileZapLast < CompiledZap_count() ) skip = true; | |
185 else if ( CompileZapLast == CompiledZap_count() ) | |
186 warning("about to compile last zap"); | |
187 | |
188 ++_CompiledZap_count; // counts skipped zaps, too | |
189 | |
190 if ( skip ) return; | |
191 | |
192 | |
193 if ( _method == NULL ) | |
194 return; // no safepoints/oopmaps emitted for calls in stubs,so we don't care | |
195 | |
196 // Insert call to zap runtime stub before every node with an oop map | |
197 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
198 Block *b = _cfg->_blocks[i]; | |
199 for ( uint j = 0; j < b->_nodes.size(); ++j ) { | |
200 Node *n = b->_nodes[j]; | |
201 | |
202 // Determining if we should insert a zap-a-lot node in output. | |
203 // We do that for all nodes that has oopmap info, except for calls | |
204 // to allocation. Calls to allocation passes in the old top-of-eden pointer | |
205 // and expect the C code to reset it. Hence, there can be no safepoints between | |
206 // the inlined-allocation and the call to new_Java, etc. | |
207 // We also cannot zap monitor calls, as they must hold the microlock | |
208 // during the call to Zap, which also wants to grab the microlock. | |
209 bool insert = n->is_MachSafePoint() && (n->as_MachSafePoint()->oop_map() != NULL); | |
210 if ( insert ) { // it is MachSafePoint | |
211 if ( !n->is_MachCall() ) { | |
212 insert = false; | |
213 } else if ( n->is_MachCall() ) { | |
214 MachCallNode* call = n->as_MachCall(); | |
215 if (call->entry_point() == OptoRuntime::new_instance_Java() || | |
216 call->entry_point() == OptoRuntime::new_array_Java() || | |
217 call->entry_point() == OptoRuntime::multianewarray2_Java() || | |
218 call->entry_point() == OptoRuntime::multianewarray3_Java() || | |
219 call->entry_point() == OptoRuntime::multianewarray4_Java() || | |
220 call->entry_point() == OptoRuntime::multianewarray5_Java() || | |
221 call->entry_point() == OptoRuntime::slow_arraycopy_Java() || | |
222 call->entry_point() == OptoRuntime::complete_monitor_locking_Java() | |
223 ) { | |
224 insert = false; | |
225 } | |
226 } | |
227 if (insert) { | |
228 Node *zap = call_zap_node(n->as_MachSafePoint(), i); | |
229 b->_nodes.insert( j, zap ); | |
230 _cfg->_bbs.map( zap->_idx, b ); | |
231 ++j; | |
232 } | |
233 } | |
234 } | |
235 } | |
236 } | |
237 | |
238 | |
239 Node* Compile::call_zap_node(MachSafePointNode* node_to_check, int block_no) { | |
240 const TypeFunc *tf = OptoRuntime::zap_dead_locals_Type(); | |
241 CallStaticJavaNode* ideal_node = | |
242 new (this, tf->domain()->cnt()) CallStaticJavaNode( tf, | |
243 OptoRuntime::zap_dead_locals_stub(_method->flags().is_native()), | |
244 "call zap dead locals stub", 0, TypePtr::BOTTOM); | |
245 // We need to copy the OopMap from the site we're zapping at. | |
246 // We have to make a copy, because the zap site might not be | |
247 // a call site, and zap_dead is a call site. | |
248 OopMap* clone = node_to_check->oop_map()->deep_copy(); | |
249 | |
250 // Add the cloned OopMap to the zap node | |
251 ideal_node->set_oop_map(clone); | |
252 return _matcher->match_sfpt(ideal_node); | |
253 } | |
254 | |
255 //------------------------------is_node_getting_a_safepoint-------------------- | |
256 bool Compile::is_node_getting_a_safepoint( Node* n) { | |
257 // This code duplicates the logic prior to the call of add_safepoint | |
258 // below in this file. | |
259 if( n->is_MachSafePoint() ) return true; | |
260 return false; | |
261 } | |
262 | |
263 # endif // ENABLE_ZAP_DEAD_LOCALS | |
264 | |
265 //------------------------------compute_loop_first_inst_sizes------------------ | |
418 | 266 // Compute the size of first NumberOfLoopInstrToAlign instructions at the top |
0 | 267 // of a loop. When aligning a loop we need to provide enough instructions |
268 // in cpu's fetch buffer to feed decoders. The loop alignment could be | |
269 // avoided if we have enough instructions in fetch buffer at the head of a loop. | |
270 // By default, the size is set to 999999 by Block's constructor so that | |
271 // a loop will be aligned if the size is not reset here. | |
272 // | |
273 // Note: Mach instructions could contain several HW instructions | |
274 // so the size is estimated only. | |
275 // | |
276 void Compile::compute_loop_first_inst_sizes() { | |
277 // The next condition is used to gate the loop alignment optimization. | |
278 // Don't aligned a loop if there are enough instructions at the head of a loop | |
279 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad | |
280 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is | |
281 // equal to 11 bytes which is the largest address NOP instruction. | |
282 if( MaxLoopPad < OptoLoopAlignment-1 ) { | |
283 uint last_block = _cfg->_num_blocks-1; | |
284 for( uint i=1; i <= last_block; i++ ) { | |
285 Block *b = _cfg->_blocks[i]; | |
286 // Check the first loop's block which requires an alignment. | |
418 | 287 if( b->loop_alignment() > (uint)relocInfo::addr_unit() ) { |
0 | 288 uint sum_size = 0; |
289 uint inst_cnt = NumberOfLoopInstrToAlign; | |
418 | 290 inst_cnt = b->compute_first_inst_size(sum_size, inst_cnt, _regalloc); |
291 | |
292 // Check subsequent fallthrough blocks if the loop's first | |
293 // block(s) does not have enough instructions. | |
294 Block *nb = b; | |
295 while( inst_cnt > 0 && | |
296 i < last_block && | |
297 !_cfg->_blocks[i+1]->has_loop_alignment() && | |
298 !nb->has_successor(b) ) { | |
299 i++; | |
300 nb = _cfg->_blocks[i]; | |
301 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, _regalloc); | |
302 } // while( inst_cnt > 0 && i < last_block ) | |
303 | |
0 | 304 b->set_first_inst_size(sum_size); |
305 } // f( b->head()->is_Loop() ) | |
306 } // for( i <= last_block ) | |
307 } // if( MaxLoopPad < OptoLoopAlignment-1 ) | |
308 } | |
309 | |
310 //----------------------Shorten_branches--------------------------------------- | |
311 // The architecture description provides short branch variants for some long | |
312 // branch instructions. Replace eligible long branches with short branches. | |
313 void Compile::Shorten_branches(Label *labels, int& code_size, int& reloc_size, int& stub_size, int& const_size) { | |
314 | |
315 // fill in the nop array for bundling computations | |
316 MachNode *_nop_list[Bundle::_nop_count]; | |
317 Bundle::initialize_nops(_nop_list, this); | |
318 | |
319 // ------------------ | |
320 // Compute size of each block, method size, and relocation information size | |
321 uint *jmp_end = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks); | |
322 uint *blk_starts = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks+1); | |
323 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks); ) | |
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324 DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks); ) |
0 | 325 blk_starts[0] = 0; |
326 | |
327 // Initialize the sizes to 0 | |
328 code_size = 0; // Size in bytes of generated code | |
329 stub_size = 0; // Size in bytes of all stub entries | |
330 // Size in bytes of all relocation entries, including those in local stubs. | |
331 // Start with 2-bytes of reloc info for the unvalidated entry point | |
332 reloc_size = 1; // Number of relocation entries | |
333 const_size = 0; // size of fp constants in words | |
334 | |
335 // Make three passes. The first computes pessimistic blk_starts, | |
336 // relative jmp_end, reloc_size and const_size information. | |
337 // The second performs short branch substitution using the pessimistic | |
338 // sizing. The third inserts nops where needed. | |
339 | |
340 Node *nj; // tmp | |
341 | |
342 // Step one, perform a pessimistic sizing pass. | |
343 uint i; | |
344 uint min_offset_from_last_call = 1; // init to a positive value | |
345 uint nop_size = (new (this) MachNopNode())->size(_regalloc); | |
346 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
347 Block *b = _cfg->_blocks[i]; | |
348 | |
349 // Sum all instruction sizes to compute block size | |
350 uint last_inst = b->_nodes.size(); | |
351 uint blk_size = 0; | |
352 for( uint j = 0; j<last_inst; j++ ) { | |
353 nj = b->_nodes[j]; | |
354 uint inst_size = nj->size(_regalloc); | |
355 blk_size += inst_size; | |
356 // Handle machine instruction nodes | |
357 if( nj->is_Mach() ) { | |
358 MachNode *mach = nj->as_Mach(); | |
359 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding | |
360 reloc_size += mach->reloc(); | |
361 const_size += mach->const_size(); | |
362 if( mach->is_MachCall() ) { | |
363 MachCallNode *mcall = mach->as_MachCall(); | |
364 // This destination address is NOT PC-relative | |
365 | |
366 mcall->method_set((intptr_t)mcall->entry_point()); | |
367 | |
368 if( mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method ) { | |
369 stub_size += size_java_to_interp(); | |
370 reloc_size += reloc_java_to_interp(); | |
371 } | |
372 } else if (mach->is_MachSafePoint()) { | |
373 // If call/safepoint are adjacent, account for possible | |
374 // nop to disambiguate the two safepoints. | |
375 if (min_offset_from_last_call == 0) { | |
376 blk_size += nop_size; | |
377 } | |
378 } | |
379 } | |
380 min_offset_from_last_call += inst_size; | |
381 // Remember end of call offset | |
382 if (nj->is_MachCall() && nj->as_MachCall()->is_safepoint_node()) { | |
383 min_offset_from_last_call = 0; | |
384 } | |
385 } | |
386 | |
387 // During short branch replacement, we store the relative (to blk_starts) | |
388 // end of jump in jmp_end, rather than the absolute end of jump. This | |
389 // is so that we do not need to recompute sizes of all nodes when we compute | |
390 // correct blk_starts in our next sizing pass. | |
391 jmp_end[i] = blk_size; | |
392 DEBUG_ONLY( jmp_target[i] = 0; ) | |
393 | |
394 // When the next block starts a loop, we may insert pad NOP | |
395 // instructions. Since we cannot know our future alignment, | |
396 // assume the worst. | |
397 if( i<_cfg->_num_blocks-1 ) { | |
398 Block *nb = _cfg->_blocks[i+1]; | |
399 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit(); | |
400 if( max_loop_pad > 0 ) { | |
401 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), ""); | |
402 blk_size += max_loop_pad; | |
403 } | |
404 } | |
405 | |
406 // Save block size; update total method size | |
407 blk_starts[i+1] = blk_starts[i]+blk_size; | |
408 } | |
409 | |
410 // Step two, replace eligible long jumps. | |
411 | |
412 // Note: this will only get the long branches within short branch | |
413 // range. Another pass might detect more branches that became | |
414 // candidates because the shortening in the first pass exposed | |
415 // more opportunities. Unfortunately, this would require | |
416 // recomputing the starting and ending positions for the blocks | |
417 for( i=0; i<_cfg->_num_blocks; i++ ) { | |
418 Block *b = _cfg->_blocks[i]; | |
419 | |
420 int j; | |
421 // Find the branch; ignore trailing NOPs. | |
422 for( j = b->_nodes.size()-1; j>=0; j-- ) { | |
423 nj = b->_nodes[j]; | |
424 if( !nj->is_Mach() || nj->as_Mach()->ideal_Opcode() != Op_Con ) | |
425 break; | |
426 } | |
427 | |
428 if (j >= 0) { | |
429 if( nj->is_Mach() && nj->as_Mach()->may_be_short_branch() ) { | |
430 MachNode *mach = nj->as_Mach(); | |
431 // This requires the TRUE branch target be in succs[0] | |
432 uint bnum = b->non_connector_successor(0)->_pre_order; | |
433 uintptr_t target = blk_starts[bnum]; | |
434 if( mach->is_pc_relative() ) { | |
435 int offset = target-(blk_starts[i] + jmp_end[i]); | |
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436 if (_matcher->is_short_branch_offset(mach->rule(), offset)) { |
0 | 437 // We've got a winner. Replace this branch. |
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438 MachNode* replacement = mach->short_branch_version(this); |
0 | 439 b->_nodes.map(j, replacement); |
222 | 440 mach->subsume_by(replacement); |
0 | 441 |
442 // Update the jmp_end size to save time in our | |
443 // next pass. | |
444 jmp_end[i] -= (mach->size(_regalloc) - replacement->size(_regalloc)); | |
445 DEBUG_ONLY( jmp_target[i] = bnum; ); | |
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446 DEBUG_ONLY( jmp_rule[i] = mach->rule(); ); |
0 | 447 } |
448 } else { | |
449 #ifndef PRODUCT | |
450 mach->dump(3); | |
451 #endif | |
452 Unimplemented(); | |
453 } | |
454 } | |
455 } | |
456 } | |
457 | |
458 // Compute the size of first NumberOfLoopInstrToAlign instructions at head | |
459 // of a loop. It is used to determine the padding for loop alignment. | |
460 compute_loop_first_inst_sizes(); | |
461 | |
462 // Step 3, compute the offsets of all the labels | |
463 uint last_call_adr = max_uint; | |
464 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
465 // copy the offset of the beginning to the corresponding label | |
466 assert(labels[i].is_unused(), "cannot patch at this point"); | |
467 labels[i].bind_loc(blk_starts[i], CodeBuffer::SECT_INSTS); | |
468 | |
469 // insert padding for any instructions that need it | |
470 Block *b = _cfg->_blocks[i]; | |
471 uint last_inst = b->_nodes.size(); | |
472 uint adr = blk_starts[i]; | |
473 for( uint j = 0; j<last_inst; j++ ) { | |
474 nj = b->_nodes[j]; | |
475 if( nj->is_Mach() ) { | |
476 int padding = nj->as_Mach()->compute_padding(adr); | |
477 // If call/safepoint are adjacent insert a nop (5010568) | |
478 if (padding == 0 && nj->is_MachSafePoint() && !nj->is_MachCall() && | |
479 adr == last_call_adr ) { | |
480 padding = nop_size; | |
481 } | |
482 if(padding > 0) { | |
483 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); | |
484 int nops_cnt = padding / nop_size; | |
485 MachNode *nop = new (this) MachNopNode(nops_cnt); | |
486 b->_nodes.insert(j++, nop); | |
487 _cfg->_bbs.map( nop->_idx, b ); | |
488 adr += padding; | |
489 last_inst++; | |
490 } | |
491 } | |
492 adr += nj->size(_regalloc); | |
493 | |
494 // Remember end of call offset | |
495 if (nj->is_MachCall() && nj->as_MachCall()->is_safepoint_node()) { | |
496 last_call_adr = adr; | |
497 } | |
498 } | |
499 | |
500 if ( i != _cfg->_num_blocks-1) { | |
501 // Get the size of the block | |
502 uint blk_size = adr - blk_starts[i]; | |
503 | |
418 | 504 // When the next block is the top of a loop, we may insert pad NOP |
0 | 505 // instructions. |
506 Block *nb = _cfg->_blocks[i+1]; | |
507 int current_offset = blk_starts[i] + blk_size; | |
508 current_offset += nb->alignment_padding(current_offset); | |
509 // Save block size; update total method size | |
510 blk_starts[i+1] = current_offset; | |
511 } | |
512 } | |
513 | |
514 #ifdef ASSERT | |
515 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
516 if( jmp_target[i] != 0 ) { | |
517 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_end[i]); | |
415
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518 if (!_matcher->is_short_branch_offset(jmp_rule[i], offset)) { |
0 | 519 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]); |
520 } | |
415
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521 assert(_matcher->is_short_branch_offset(jmp_rule[i], offset), "Displacement too large for short jmp"); |
0 | 522 } |
523 } | |
524 #endif | |
525 | |
526 // ------------------ | |
527 // Compute size for code buffer | |
528 code_size = blk_starts[i-1] + jmp_end[i-1]; | |
529 | |
530 // Relocation records | |
531 reloc_size += 1; // Relo entry for exception handler | |
532 | |
533 // Adjust reloc_size to number of record of relocation info | |
534 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for | |
535 // a relocation index. | |
536 // The CodeBuffer will expand the locs array if this estimate is too low. | |
537 reloc_size *= 10 / sizeof(relocInfo); | |
538 | |
539 // Adjust const_size to number of bytes | |
540 const_size *= 2*jintSize; // both float and double take two words per entry | |
541 | |
542 } | |
543 | |
544 //------------------------------FillLocArray----------------------------------- | |
545 // Create a bit of debug info and append it to the array. The mapping is from | |
546 // Java local or expression stack to constant, register or stack-slot. For | |
547 // doubles, insert 2 mappings and return 1 (to tell the caller that the next | |
548 // entry has been taken care of and caller should skip it). | |
549 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) { | |
550 // This should never have accepted Bad before | |
551 assert(OptoReg::is_valid(regnum), "location must be valid"); | |
552 return (OptoReg::is_reg(regnum)) | |
553 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) ) | |
554 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum))); | |
555 } | |
556 | |
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557 |
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558 ObjectValue* |
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559 Compile::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) { |
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560 for (int i = 0; i < objs->length(); i++) { |
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561 assert(objs->at(i)->is_object(), "corrupt object cache"); |
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562 ObjectValue* sv = (ObjectValue*) objs->at(i); |
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563 if (sv->id() == id) { |
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564 return sv; |
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565 } |
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566 } |
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567 // Otherwise.. |
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568 return NULL; |
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569 } |
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570 |
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571 void Compile::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs, |
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572 ObjectValue* sv ) { |
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573 assert(sv_for_node_id(objs, sv->id()) == NULL, "Precondition"); |
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574 objs->append(sv); |
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575 } |
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576 |
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577 |
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578 void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local, |
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579 GrowableArray<ScopeValue*> *array, |
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580 GrowableArray<ScopeValue*> *objs ) { |
0 | 581 assert( local, "use _top instead of null" ); |
582 if (array->length() != idx) { | |
583 assert(array->length() == idx + 1, "Unexpected array count"); | |
584 // Old functionality: | |
585 // return | |
586 // New functionality: | |
587 // Assert if the local is not top. In product mode let the new node | |
588 // override the old entry. | |
589 assert(local == top(), "LocArray collision"); | |
590 if (local == top()) { | |
591 return; | |
592 } | |
593 array->pop(); | |
594 } | |
595 const Type *t = local->bottom_type(); | |
596 | |
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597 // Is it a safepoint scalar object node? |
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598 if (local->is_SafePointScalarObject()) { |
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599 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject(); |
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600 |
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601 ObjectValue* sv = Compile::sv_for_node_id(objs, spobj->_idx); |
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602 if (sv == NULL) { |
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603 ciKlass* cik = t->is_oopptr()->klass(); |
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604 assert(cik->is_instance_klass() || |
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605 cik->is_array_klass(), "Not supported allocation."); |
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606 sv = new ObjectValue(spobj->_idx, |
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607 new ConstantOopWriteValue(cik->encoding())); |
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608 Compile::set_sv_for_object_node(objs, sv); |
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609 |
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610 uint first_ind = spobj->first_index(); |
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611 for (uint i = 0; i < spobj->n_fields(); i++) { |
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612 Node* fld_node = sfpt->in(first_ind+i); |
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613 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs); |
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614 } |
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615 } |
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616 array->append(sv); |
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617 return; |
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618 } |
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619 |
0 | 620 // Grab the register number for the local |
621 OptoReg::Name regnum = _regalloc->get_reg_first(local); | |
622 if( OptoReg::is_valid(regnum) ) {// Got a register/stack? | |
623 // Record the double as two float registers. | |
624 // The register mask for such a value always specifies two adjacent | |
625 // float registers, with the lower register number even. | |
626 // Normally, the allocation of high and low words to these registers | |
627 // is irrelevant, because nearly all operations on register pairs | |
628 // (e.g., StoreD) treat them as a single unit. | |
629 // Here, we assume in addition that the words in these two registers | |
630 // stored "naturally" (by operations like StoreD and double stores | |
631 // within the interpreter) such that the lower-numbered register | |
632 // is written to the lower memory address. This may seem like | |
633 // a machine dependency, but it is not--it is a requirement on | |
634 // the author of the <arch>.ad file to ensure that, for every | |
635 // even/odd double-register pair to which a double may be allocated, | |
636 // the word in the even single-register is stored to the first | |
637 // memory word. (Note that register numbers are completely | |
638 // arbitrary, and are not tied to any machine-level encodings.) | |
639 #ifdef _LP64 | |
640 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) { | |
641 array->append(new ConstantIntValue(0)); | |
642 array->append(new_loc_value( _regalloc, regnum, Location::dbl )); | |
643 } else if ( t->base() == Type::Long ) { | |
644 array->append(new ConstantIntValue(0)); | |
645 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
646 } else if ( t->base() == Type::RawPtr ) { | |
647 // jsr/ret return address which must be restored into a the full | |
648 // width 64-bit stack slot. | |
649 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
650 } | |
651 #else //_LP64 | |
652 #ifdef SPARC | |
653 if (t->base() == Type::Long && OptoReg::is_reg(regnum)) { | |
654 // For SPARC we have to swap high and low words for | |
655 // long values stored in a single-register (g0-g7). | |
656 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
657 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
658 } else | |
659 #endif //SPARC | |
660 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) { | |
661 // Repack the double/long as two jints. | |
662 // The convention the interpreter uses is that the second local | |
663 // holds the first raw word of the native double representation. | |
664 // This is actually reasonable, since locals and stack arrays | |
665 // grow downwards in all implementations. | |
666 // (If, on some machine, the interpreter's Java locals or stack | |
667 // were to grow upwards, the embedded doubles would be word-swapped.) | |
668 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
669 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
670 } | |
671 #endif //_LP64 | |
672 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) && | |
673 OptoReg::is_reg(regnum) ) { | |
674 array->append(new_loc_value( _regalloc, regnum, Matcher::float_in_double | |
675 ? Location::float_in_dbl : Location::normal )); | |
676 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) { | |
677 array->append(new_loc_value( _regalloc, regnum, Matcher::int_in_long | |
678 ? Location::int_in_long : Location::normal )); | |
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679 } else if( t->base() == Type::NarrowOop ) { |
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680 array->append(new_loc_value( _regalloc, regnum, Location::narrowoop )); |
0 | 681 } else { |
682 array->append(new_loc_value( _regalloc, regnum, _regalloc->is_oop(local) ? Location::oop : Location::normal )); | |
683 } | |
684 return; | |
685 } | |
686 | |
687 // No register. It must be constant data. | |
688 switch (t->base()) { | |
689 case Type::Half: // Second half of a double | |
690 ShouldNotReachHere(); // Caller should skip 2nd halves | |
691 break; | |
692 case Type::AnyPtr: | |
693 array->append(new ConstantOopWriteValue(NULL)); | |
694 break; | |
695 case Type::AryPtr: | |
696 case Type::InstPtr: | |
697 case Type::KlassPtr: // fall through | |
698 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->encoding())); | |
699 break; | |
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700 case Type::NarrowOop: |
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701 if (t == TypeNarrowOop::NULL_PTR) { |
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702 array->append(new ConstantOopWriteValue(NULL)); |
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703 } else { |
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704 array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->encoding())); |
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705 } |
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706 break; |
0 | 707 case Type::Int: |
708 array->append(new ConstantIntValue(t->is_int()->get_con())); | |
709 break; | |
710 case Type::RawPtr: | |
711 // A return address (T_ADDRESS). | |
712 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI"); | |
713 #ifdef _LP64 | |
714 // Must be restored to the full-width 64-bit stack slot. | |
715 array->append(new ConstantLongValue(t->is_ptr()->get_con())); | |
716 #else | |
717 array->append(new ConstantIntValue(t->is_ptr()->get_con())); | |
718 #endif | |
719 break; | |
720 case Type::FloatCon: { | |
721 float f = t->is_float_constant()->getf(); | |
722 array->append(new ConstantIntValue(jint_cast(f))); | |
723 break; | |
724 } | |
725 case Type::DoubleCon: { | |
726 jdouble d = t->is_double_constant()->getd(); | |
727 #ifdef _LP64 | |
728 array->append(new ConstantIntValue(0)); | |
729 array->append(new ConstantDoubleValue(d)); | |
730 #else | |
731 // Repack the double as two jints. | |
732 // The convention the interpreter uses is that the second local | |
733 // holds the first raw word of the native double representation. | |
734 // This is actually reasonable, since locals and stack arrays | |
735 // grow downwards in all implementations. | |
736 // (If, on some machine, the interpreter's Java locals or stack | |
737 // were to grow upwards, the embedded doubles would be word-swapped.) | |
738 jint *dp = (jint*)&d; | |
739 array->append(new ConstantIntValue(dp[1])); | |
740 array->append(new ConstantIntValue(dp[0])); | |
741 #endif | |
742 break; | |
743 } | |
744 case Type::Long: { | |
745 jlong d = t->is_long()->get_con(); | |
746 #ifdef _LP64 | |
747 array->append(new ConstantIntValue(0)); | |
748 array->append(new ConstantLongValue(d)); | |
749 #else | |
750 // Repack the long as two jints. | |
751 // The convention the interpreter uses is that the second local | |
752 // holds the first raw word of the native double representation. | |
753 // This is actually reasonable, since locals and stack arrays | |
754 // grow downwards in all implementations. | |
755 // (If, on some machine, the interpreter's Java locals or stack | |
756 // were to grow upwards, the embedded doubles would be word-swapped.) | |
757 jint *dp = (jint*)&d; | |
758 array->append(new ConstantIntValue(dp[1])); | |
759 array->append(new ConstantIntValue(dp[0])); | |
760 #endif | |
761 break; | |
762 } | |
763 case Type::Top: // Add an illegal value here | |
764 array->append(new LocationValue(Location())); | |
765 break; | |
766 default: | |
767 ShouldNotReachHere(); | |
768 break; | |
769 } | |
770 } | |
771 | |
772 // Determine if this node starts a bundle | |
773 bool Compile::starts_bundle(const Node *n) const { | |
774 return (_node_bundling_limit > n->_idx && | |
775 _node_bundling_base[n->_idx].starts_bundle()); | |
776 } | |
777 | |
778 //--------------------------Process_OopMap_Node-------------------------------- | |
779 void Compile::Process_OopMap_Node(MachNode *mach, int current_offset) { | |
780 | |
781 // Handle special safepoint nodes for synchronization | |
782 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
783 MachCallNode *mcall; | |
784 | |
785 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
786 assert( is_node_getting_a_safepoint(mach), "logic does not match; false negative"); | |
787 #endif | |
788 | |
789 int safepoint_pc_offset = current_offset; | |
790 | |
791 // Add the safepoint in the DebugInfoRecorder | |
792 if( !mach->is_MachCall() ) { | |
793 mcall = NULL; | |
794 debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map); | |
795 } else { | |
796 mcall = mach->as_MachCall(); | |
797 safepoint_pc_offset += mcall->ret_addr_offset(); | |
798 debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map); | |
799 } | |
800 | |
801 // Loop over the JVMState list to add scope information | |
802 // Do not skip safepoints with a NULL method, they need monitor info | |
803 JVMState* youngest_jvms = sfn->jvms(); | |
804 int max_depth = youngest_jvms->depth(); | |
805 | |
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806 // Allocate the object pool for scalar-replaced objects -- the map from |
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807 // small-integer keys (which can be recorded in the local and ostack |
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808 // arrays) to descriptions of the object state. |
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809 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>(); |
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810 |
0 | 811 // Visit scopes from oldest to youngest. |
812 for (int depth = 1; depth <= max_depth; depth++) { | |
813 JVMState* jvms = youngest_jvms->of_depth(depth); | |
814 int idx; | |
815 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
816 // Safepoints that do not have method() set only provide oop-map and monitor info | |
817 // to support GC; these do not support deoptimization. | |
818 int num_locs = (method == NULL) ? 0 : jvms->loc_size(); | |
819 int num_exps = (method == NULL) ? 0 : jvms->stk_size(); | |
820 int num_mon = jvms->nof_monitors(); | |
821 assert(method == NULL || jvms->bci() < 0 || num_locs == method->max_locals(), | |
822 "JVMS local count must match that of the method"); | |
823 | |
824 // Add Local and Expression Stack Information | |
825 | |
826 // Insert locals into the locarray | |
827 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs); | |
828 for( idx = 0; idx < num_locs; idx++ ) { | |
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829 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs ); |
0 | 830 } |
831 | |
832 // Insert expression stack entries into the exparray | |
833 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps); | |
834 for( idx = 0; idx < num_exps; idx++ ) { | |
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835 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs ); |
0 | 836 } |
837 | |
838 // Add in mappings of the monitors | |
839 assert( !method || | |
840 !method->is_synchronized() || | |
841 method->is_native() || | |
842 num_mon > 0 || | |
843 !GenerateSynchronizationCode, | |
844 "monitors must always exist for synchronized methods"); | |
845 | |
846 // Build the growable array of ScopeValues for exp stack | |
847 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon); | |
848 | |
849 // Loop over monitors and insert into array | |
850 for(idx = 0; idx < num_mon; idx++) { | |
851 // Grab the node that defines this monitor | |
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852 Node* box_node = sfn->monitor_box(jvms, idx); |
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853 Node* obj_node = sfn->monitor_obj(jvms, idx); |
0 | 854 |
855 // Create ScopeValue for object | |
856 ScopeValue *scval = NULL; | |
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857 |
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858 if( obj_node->is_SafePointScalarObject() ) { |
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859 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject(); |
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860 scval = Compile::sv_for_node_id(objs, spobj->_idx); |
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861 if (scval == NULL) { |
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862 const Type *t = obj_node->bottom_type(); |
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863 ciKlass* cik = t->is_oopptr()->klass(); |
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864 assert(cik->is_instance_klass() || |
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865 cik->is_array_klass(), "Not supported allocation."); |
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866 ObjectValue* sv = new ObjectValue(spobj->_idx, |
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867 new ConstantOopWriteValue(cik->encoding())); |
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868 Compile::set_sv_for_object_node(objs, sv); |
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869 |
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870 uint first_ind = spobj->first_index(); |
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871 for (uint i = 0; i < spobj->n_fields(); i++) { |
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872 Node* fld_node = sfn->in(first_ind+i); |
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873 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs); |
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874 } |
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875 scval = sv; |
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876 } |
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877 } else if( !obj_node->is_Con() ) { |
0 | 878 OptoReg::Name obj_reg = _regalloc->get_reg_first(obj_node); |
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879 if( obj_node->bottom_type()->base() == Type::NarrowOop ) { |
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880 scval = new_loc_value( _regalloc, obj_reg, Location::narrowoop ); |
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881 } else { |
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882 scval = new_loc_value( _regalloc, obj_reg, Location::oop ); |
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883 } |
0 | 884 } else { |
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885 const TypePtr *tp = obj_node->bottom_type()->make_ptr(); |
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886 scval = new ConstantOopWriteValue(tp->is_instptr()->const_oop()->encoding()); |
0 | 887 } |
888 | |
889 OptoReg::Name box_reg = BoxLockNode::stack_slot(box_node); | |
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890 Location basic_lock = Location::new_stk_loc(Location::normal,_regalloc->reg2offset(box_reg)); |
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891 while( !box_node->is_BoxLock() ) box_node = box_node->in(1); |
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892 monarray->append(new MonitorValue(scval, basic_lock, box_node->as_BoxLock()->is_eliminated())); |
0 | 893 } |
894 | |
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895 // We dump the object pool first, since deoptimization reads it in first. |
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896 debug_info()->dump_object_pool(objs); |
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897 |
0 | 898 // Build first class objects to pass to scope |
899 DebugToken *locvals = debug_info()->create_scope_values(locarray); | |
900 DebugToken *expvals = debug_info()->create_scope_values(exparray); | |
901 DebugToken *monvals = debug_info()->create_monitor_values(monarray); | |
902 | |
903 // Make method available for all Safepoints | |
904 ciMethod* scope_method = method ? method : _method; | |
905 // Describe the scope here | |
906 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI"); | |
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907 // Now we can describe the scope. |
0 | 908 debug_info()->describe_scope(safepoint_pc_offset,scope_method,jvms->bci(),locvals,expvals,monvals); |
909 } // End jvms loop | |
910 | |
911 // Mark the end of the scope set. | |
912 debug_info()->end_safepoint(safepoint_pc_offset); | |
913 } | |
914 | |
915 | |
916 | |
917 // A simplified version of Process_OopMap_Node, to handle non-safepoints. | |
918 class NonSafepointEmitter { | |
919 Compile* C; | |
920 JVMState* _pending_jvms; | |
921 int _pending_offset; | |
922 | |
923 void emit_non_safepoint(); | |
924 | |
925 public: | |
926 NonSafepointEmitter(Compile* compile) { | |
927 this->C = compile; | |
928 _pending_jvms = NULL; | |
929 _pending_offset = 0; | |
930 } | |
931 | |
932 void observe_instruction(Node* n, int pc_offset) { | |
933 if (!C->debug_info()->recording_non_safepoints()) return; | |
934 | |
935 Node_Notes* nn = C->node_notes_at(n->_idx); | |
936 if (nn == NULL || nn->jvms() == NULL) return; | |
937 if (_pending_jvms != NULL && | |
938 _pending_jvms->same_calls_as(nn->jvms())) { | |
939 // Repeated JVMS? Stretch it up here. | |
940 _pending_offset = pc_offset; | |
941 } else { | |
942 if (_pending_jvms != NULL && | |
943 _pending_offset < pc_offset) { | |
944 emit_non_safepoint(); | |
945 } | |
946 _pending_jvms = NULL; | |
947 if (pc_offset > C->debug_info()->last_pc_offset()) { | |
948 // This is the only way _pending_jvms can become non-NULL: | |
949 _pending_jvms = nn->jvms(); | |
950 _pending_offset = pc_offset; | |
951 } | |
952 } | |
953 } | |
954 | |
955 // Stay out of the way of real safepoints: | |
956 void observe_safepoint(JVMState* jvms, int pc_offset) { | |
957 if (_pending_jvms != NULL && | |
958 !_pending_jvms->same_calls_as(jvms) && | |
959 _pending_offset < pc_offset) { | |
960 emit_non_safepoint(); | |
961 } | |
962 _pending_jvms = NULL; | |
963 } | |
964 | |
965 void flush_at_end() { | |
966 if (_pending_jvms != NULL) { | |
967 emit_non_safepoint(); | |
968 } | |
969 _pending_jvms = NULL; | |
970 } | |
971 }; | |
972 | |
973 void NonSafepointEmitter::emit_non_safepoint() { | |
974 JVMState* youngest_jvms = _pending_jvms; | |
975 int pc_offset = _pending_offset; | |
976 | |
977 // Clear it now: | |
978 _pending_jvms = NULL; | |
979 | |
980 DebugInformationRecorder* debug_info = C->debug_info(); | |
981 assert(debug_info->recording_non_safepoints(), "sanity"); | |
982 | |
983 debug_info->add_non_safepoint(pc_offset); | |
984 int max_depth = youngest_jvms->depth(); | |
985 | |
986 // Visit scopes from oldest to youngest. | |
987 for (int depth = 1; depth <= max_depth; depth++) { | |
988 JVMState* jvms = youngest_jvms->of_depth(depth); | |
989 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
990 debug_info->describe_scope(pc_offset, method, jvms->bci()); | |
991 } | |
992 | |
993 // Mark the end of the scope set. | |
994 debug_info->end_non_safepoint(pc_offset); | |
995 } | |
996 | |
997 | |
998 | |
999 // helper for Fill_buffer bailout logic | |
1000 static void turn_off_compiler(Compile* C) { | |
1001 if (CodeCache::unallocated_capacity() >= CodeCacheMinimumFreeSpace*10) { | |
1002 // Do not turn off compilation if a single giant method has | |
1003 // blown the code cache size. | |
1004 C->record_failure("excessive request to CodeCache"); | |
1005 } else { | |
28 | 1006 // Let CompilerBroker disable further compilations. |
0 | 1007 C->record_failure("CodeCache is full"); |
1008 } | |
1009 } | |
1010 | |
1011 | |
1012 //------------------------------Fill_buffer------------------------------------ | |
1013 void Compile::Fill_buffer() { | |
1014 | |
1015 // Set the initially allocated size | |
1016 int code_req = initial_code_capacity; | |
1017 int locs_req = initial_locs_capacity; | |
1018 int stub_req = TraceJumps ? initial_stub_capacity * 10 : initial_stub_capacity; | |
1019 int const_req = initial_const_capacity; | |
1020 bool labels_not_set = true; | |
1021 | |
1022 int pad_req = NativeCall::instruction_size; | |
1023 // The extra spacing after the code is necessary on some platforms. | |
1024 // Sometimes we need to patch in a jump after the last instruction, | |
1025 // if the nmethod has been deoptimized. (See 4932387, 4894843.) | |
1026 | |
1027 uint i; | |
1028 // Compute the byte offset where we can store the deopt pc. | |
1029 if (fixed_slots() != 0) { | |
1030 _orig_pc_slot_offset_in_bytes = _regalloc->reg2offset(OptoReg::stack2reg(_orig_pc_slot)); | |
1031 } | |
1032 | |
1033 // Compute prolog code size | |
1034 _method_size = 0; | |
1035 _frame_slots = OptoReg::reg2stack(_matcher->_old_SP)+_regalloc->_framesize; | |
1036 #ifdef IA64 | |
1037 if (save_argument_registers()) { | |
1038 // 4815101: this is a stub with implicit and unknown precision fp args. | |
1039 // The usual spill mechanism can only generate stfd's in this case, which | |
1040 // doesn't work if the fp reg to spill contains a single-precision denorm. | |
1041 // Instead, we hack around the normal spill mechanism using stfspill's and | |
1042 // ldffill's in the MachProlog and MachEpilog emit methods. We allocate | |
1043 // space here for the fp arg regs (f8-f15) we're going to thusly spill. | |
1044 // | |
1045 // If we ever implement 16-byte 'registers' == stack slots, we can | |
1046 // get rid of this hack and have SpillCopy generate stfspill/ldffill | |
1047 // instead of stfd/stfs/ldfd/ldfs. | |
1048 _frame_slots += 8*(16/BytesPerInt); | |
1049 } | |
1050 #endif | |
1051 assert( _frame_slots >= 0 && _frame_slots < 1000000, "sanity check" ); | |
1052 | |
1053 // Create an array of unused labels, one for each basic block | |
1054 Label *blk_labels = NEW_RESOURCE_ARRAY(Label, _cfg->_num_blocks+1); | |
1055 | |
1056 for( i=0; i <= _cfg->_num_blocks; i++ ) { | |
1057 blk_labels[i].init(); | |
1058 } | |
1059 | |
1060 // If this machine supports different size branch offsets, then pre-compute | |
1061 // the length of the blocks | |
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1062 if( _matcher->is_short_branch_offset(-1, 0) ) { |
0 | 1063 Shorten_branches(blk_labels, code_req, locs_req, stub_req, const_req); |
1064 labels_not_set = false; | |
1065 } | |
1066 | |
1067 // nmethod and CodeBuffer count stubs & constants as part of method's code. | |
1068 int exception_handler_req = size_exception_handler(); | |
1069 int deopt_handler_req = size_deopt_handler(); | |
1070 exception_handler_req += MAX_stubs_size; // add marginal slop for handler | |
1071 deopt_handler_req += MAX_stubs_size; // add marginal slop for handler | |
1072 stub_req += MAX_stubs_size; // ensure per-stub margin | |
1073 code_req += MAX_inst_size; // ensure per-instruction margin | |
1074 if (StressCodeBuffers) | |
1075 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion | |
1076 int total_req = code_req + pad_req + stub_req + exception_handler_req + deopt_handler_req + const_req; | |
1077 CodeBuffer* cb = code_buffer(); | |
1078 cb->initialize(total_req, locs_req); | |
1079 | |
1080 // Have we run out of code space? | |
1081 if (cb->blob() == NULL) { | |
1082 turn_off_compiler(this); | |
1083 return; | |
1084 } | |
1085 // Configure the code buffer. | |
1086 cb->initialize_consts_size(const_req); | |
1087 cb->initialize_stubs_size(stub_req); | |
1088 cb->initialize_oop_recorder(env()->oop_recorder()); | |
1089 | |
1090 // fill in the nop array for bundling computations | |
1091 MachNode *_nop_list[Bundle::_nop_count]; | |
1092 Bundle::initialize_nops(_nop_list, this); | |
1093 | |
1094 // Create oopmap set. | |
1095 _oop_map_set = new OopMapSet(); | |
1096 | |
1097 // !!!!! This preserves old handling of oopmaps for now | |
1098 debug_info()->set_oopmaps(_oop_map_set); | |
1099 | |
1100 // Count and start of implicit null check instructions | |
1101 uint inct_cnt = 0; | |
1102 uint *inct_starts = NEW_RESOURCE_ARRAY(uint, _cfg->_num_blocks+1); | |
1103 | |
1104 // Count and start of calls | |
1105 uint *call_returns = NEW_RESOURCE_ARRAY(uint, _cfg->_num_blocks+1); | |
1106 | |
1107 uint return_offset = 0; | |
1108 MachNode *nop = new (this) MachNopNode(); | |
1109 | |
1110 int previous_offset = 0; | |
1111 int current_offset = 0; | |
1112 int last_call_offset = -1; | |
1113 | |
1114 // Create an array of unused labels, one for each basic block, if printing is enabled | |
1115 #ifndef PRODUCT | |
1116 int *node_offsets = NULL; | |
1117 uint node_offset_limit = unique(); | |
1118 | |
1119 | |
1120 if ( print_assembly() ) | |
1121 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit); | |
1122 #endif | |
1123 | |
1124 NonSafepointEmitter non_safepoints(this); // emit non-safepoints lazily | |
1125 | |
1126 // ------------------ | |
1127 // Now fill in the code buffer | |
1128 Node *delay_slot = NULL; | |
1129 | |
1130 for( i=0; i < _cfg->_num_blocks; i++ ) { | |
1131 Block *b = _cfg->_blocks[i]; | |
1132 | |
1133 Node *head = b->head(); | |
1134 | |
1135 // If this block needs to start aligned (i.e, can be reached other | |
1136 // than by falling-thru from the previous block), then force the | |
1137 // start of a new bundle. | |
1138 if( Pipeline::requires_bundling() && starts_bundle(head) ) | |
1139 cb->flush_bundle(true); | |
1140 | |
1141 // Define the label at the beginning of the basic block | |
1142 if( labels_not_set ) | |
1143 MacroAssembler(cb).bind( blk_labels[b->_pre_order] ); | |
1144 | |
1145 else | |
1146 assert( blk_labels[b->_pre_order].loc_pos() == cb->code_size(), | |
1147 "label position does not match code offset" ); | |
1148 | |
1149 uint last_inst = b->_nodes.size(); | |
1150 | |
1151 // Emit block normally, except for last instruction. | |
1152 // Emit means "dump code bits into code buffer". | |
1153 for( uint j = 0; j<last_inst; j++ ) { | |
1154 | |
1155 // Get the node | |
1156 Node* n = b->_nodes[j]; | |
1157 | |
1158 // See if delay slots are supported | |
1159 if (valid_bundle_info(n) && | |
1160 node_bundling(n)->used_in_unconditional_delay()) { | |
1161 assert(delay_slot == NULL, "no use of delay slot node"); | |
1162 assert(n->size(_regalloc) == Pipeline::instr_unit_size(), "delay slot instruction wrong size"); | |
1163 | |
1164 delay_slot = n; | |
1165 continue; | |
1166 } | |
1167 | |
1168 // If this starts a new instruction group, then flush the current one | |
1169 // (but allow split bundles) | |
1170 if( Pipeline::requires_bundling() && starts_bundle(n) ) | |
1171 cb->flush_bundle(false); | |
1172 | |
1173 // The following logic is duplicated in the code ifdeffed for | |
1174 // ENABLE_ZAP_DEAD_LOCALS which apppears above in this file. It | |
1175 // should be factored out. Or maybe dispersed to the nodes? | |
1176 | |
1177 // Special handling for SafePoint/Call Nodes | |
1178 bool is_mcall = false; | |
1179 if( n->is_Mach() ) { | |
1180 MachNode *mach = n->as_Mach(); | |
1181 is_mcall = n->is_MachCall(); | |
1182 bool is_sfn = n->is_MachSafePoint(); | |
1183 | |
1184 // If this requires all previous instructions be flushed, then do so | |
1185 if( is_sfn || is_mcall || mach->alignment_required() != 1) { | |
1186 cb->flush_bundle(true); | |
1187 current_offset = cb->code_size(); | |
1188 } | |
1189 | |
1190 // align the instruction if necessary | |
1191 int nop_size = nop->size(_regalloc); | |
1192 int padding = mach->compute_padding(current_offset); | |
1193 // Make sure safepoint node for polling is distinct from a call's | |
1194 // return by adding a nop if needed. | |
1195 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset ) { | |
1196 padding = nop_size; | |
1197 } | |
1198 assert( labels_not_set || padding == 0, "instruction should already be aligned") | |
1199 | |
1200 if(padding > 0) { | |
1201 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); | |
1202 int nops_cnt = padding / nop_size; | |
1203 MachNode *nop = new (this) MachNopNode(nops_cnt); | |
1204 b->_nodes.insert(j++, nop); | |
1205 last_inst++; | |
1206 _cfg->_bbs.map( nop->_idx, b ); | |
1207 nop->emit(*cb, _regalloc); | |
1208 cb->flush_bundle(true); | |
1209 current_offset = cb->code_size(); | |
1210 } | |
1211 | |
1212 // Remember the start of the last call in a basic block | |
1213 if (is_mcall) { | |
1214 MachCallNode *mcall = mach->as_MachCall(); | |
1215 | |
1216 // This destination address is NOT PC-relative | |
1217 mcall->method_set((intptr_t)mcall->entry_point()); | |
1218 | |
1219 // Save the return address | |
1220 call_returns[b->_pre_order] = current_offset + mcall->ret_addr_offset(); | |
1221 | |
1222 if (!mcall->is_safepoint_node()) { | |
1223 is_mcall = false; | |
1224 is_sfn = false; | |
1225 } | |
1226 } | |
1227 | |
1228 // sfn will be valid whenever mcall is valid now because of inheritance | |
1229 if( is_sfn || is_mcall ) { | |
1230 | |
1231 // Handle special safepoint nodes for synchronization | |
1232 if( !is_mcall ) { | |
1233 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
1234 // !!!!! Stubs only need an oopmap right now, so bail out | |
1235 if( sfn->jvms()->method() == NULL) { | |
1236 // Write the oopmap directly to the code blob??!! | |
1237 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
1238 assert( !is_node_getting_a_safepoint(sfn), "logic does not match; false positive"); | |
1239 # endif | |
1240 continue; | |
1241 } | |
1242 } // End synchronization | |
1243 | |
1244 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
1245 current_offset); | |
1246 Process_OopMap_Node(mach, current_offset); | |
1247 } // End if safepoint | |
1248 | |
1249 // If this is a null check, then add the start of the previous instruction to the list | |
1250 else if( mach->is_MachNullCheck() ) { | |
1251 inct_starts[inct_cnt++] = previous_offset; | |
1252 } | |
1253 | |
1254 // If this is a branch, then fill in the label with the target BB's label | |
1255 else if ( mach->is_Branch() ) { | |
1256 | |
1257 if ( mach->ideal_Opcode() == Op_Jump ) { | |
1258 for (uint h = 0; h < b->_num_succs; h++ ) { | |
1259 Block* succs_block = b->_succs[h]; | |
1260 for (uint j = 1; j < succs_block->num_preds(); j++) { | |
1261 Node* jpn = succs_block->pred(j); | |
1262 if ( jpn->is_JumpProj() && jpn->in(0) == mach ) { | |
1263 uint block_num = succs_block->non_connector()->_pre_order; | |
1264 Label *blkLabel = &blk_labels[block_num]; | |
1265 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel); | |
1266 } | |
1267 } | |
1268 } | |
1269 } else { | |
1270 // For Branchs | |
1271 // This requires the TRUE branch target be in succs[0] | |
1272 uint block_num = b->non_connector_successor(0)->_pre_order; | |
1273 mach->label_set( blk_labels[block_num], block_num ); | |
1274 } | |
1275 } | |
1276 | |
1277 #ifdef ASSERT | |
1278 // Check that oop-store preceeds the card-mark | |
1279 else if( mach->ideal_Opcode() == Op_StoreCM ) { | |
1280 uint storeCM_idx = j; | |
1281 Node *oop_store = mach->in(mach->_cnt); // First precedence edge | |
1282 assert( oop_store != NULL, "storeCM expects a precedence edge"); | |
1283 uint i4; | |
1284 for( i4 = 0; i4 < last_inst; ++i4 ) { | |
1285 if( b->_nodes[i4] == oop_store ) break; | |
1286 } | |
1287 // Note: This test can provide a false failure if other precedence | |
1288 // edges have been added to the storeCMNode. | |
1289 assert( i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store"); | |
1290 } | |
1291 #endif | |
1292 | |
1293 else if( !n->is_Proj() ) { | |
1294 // Remember the begining of the previous instruction, in case | |
1295 // it's followed by a flag-kill and a null-check. Happens on | |
1296 // Intel all the time, with add-to-memory kind of opcodes. | |
1297 previous_offset = current_offset; | |
1298 } | |
1299 } | |
1300 | |
1301 // Verify that there is sufficient space remaining | |
1302 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size); | |
1303 if (cb->blob() == NULL) { | |
1304 turn_off_compiler(this); | |
1305 return; | |
1306 } | |
1307 | |
1308 // Save the offset for the listing | |
1309 #ifndef PRODUCT | |
1310 if( node_offsets && n->_idx < node_offset_limit ) | |
1311 node_offsets[n->_idx] = cb->code_size(); | |
1312 #endif | |
1313 | |
1314 // "Normal" instruction case | |
1315 n->emit(*cb, _regalloc); | |
1316 current_offset = cb->code_size(); | |
1317 non_safepoints.observe_instruction(n, current_offset); | |
1318 | |
1319 // mcall is last "call" that can be a safepoint | |
1320 // record it so we can see if a poll will directly follow it | |
1321 // in which case we'll need a pad to make the PcDesc sites unique | |
1322 // see 5010568. This can be slightly inaccurate but conservative | |
1323 // in the case that return address is not actually at current_offset. | |
1324 // This is a small price to pay. | |
1325 | |
1326 if (is_mcall) { | |
1327 last_call_offset = current_offset; | |
1328 } | |
1329 | |
1330 // See if this instruction has a delay slot | |
1331 if ( valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { | |
1332 assert(delay_slot != NULL, "expecting delay slot node"); | |
1333 | |
1334 // Back up 1 instruction | |
1335 cb->set_code_end( | |
1336 cb->code_end()-Pipeline::instr_unit_size()); | |
1337 | |
1338 // Save the offset for the listing | |
1339 #ifndef PRODUCT | |
1340 if( node_offsets && delay_slot->_idx < node_offset_limit ) | |
1341 node_offsets[delay_slot->_idx] = cb->code_size(); | |
1342 #endif | |
1343 | |
1344 // Support a SafePoint in the delay slot | |
1345 if( delay_slot->is_MachSafePoint() ) { | |
1346 MachNode *mach = delay_slot->as_Mach(); | |
1347 // !!!!! Stubs only need an oopmap right now, so bail out | |
1348 if( !mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL ) { | |
1349 // Write the oopmap directly to the code blob??!! | |
1350 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
1351 assert( !is_node_getting_a_safepoint(mach), "logic does not match; false positive"); | |
1352 # endif | |
1353 delay_slot = NULL; | |
1354 continue; | |
1355 } | |
1356 | |
1357 int adjusted_offset = current_offset - Pipeline::instr_unit_size(); | |
1358 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
1359 adjusted_offset); | |
1360 // Generate an OopMap entry | |
1361 Process_OopMap_Node(mach, adjusted_offset); | |
1362 } | |
1363 | |
1364 // Insert the delay slot instruction | |
1365 delay_slot->emit(*cb, _regalloc); | |
1366 | |
1367 // Don't reuse it | |
1368 delay_slot = NULL; | |
1369 } | |
1370 | |
1371 } // End for all instructions in block | |
1372 | |
418 | 1373 // If the next block is the top of a loop, pad this block out to align |
1374 // the loop top a little. Helps prevent pipe stalls at loop back branches. | |
0 | 1375 int nop_size = (new (this) MachNopNode())->size(_regalloc); |
1376 if( i<_cfg->_num_blocks-1 ) { | |
1377 Block *nb = _cfg->_blocks[i+1]; | |
1378 uint padding = nb->alignment_padding(current_offset); | |
1379 if( padding > 0 ) { | |
1380 MachNode *nop = new (this) MachNopNode(padding / nop_size); | |
1381 b->_nodes.insert( b->_nodes.size(), nop ); | |
1382 _cfg->_bbs.map( nop->_idx, b ); | |
1383 nop->emit(*cb, _regalloc); | |
1384 current_offset = cb->code_size(); | |
1385 } | |
1386 } | |
1387 | |
1388 } // End of for all blocks | |
1389 | |
1390 non_safepoints.flush_at_end(); | |
1391 | |
1392 // Offset too large? | |
1393 if (failing()) return; | |
1394 | |
1395 // Define a pseudo-label at the end of the code | |
1396 MacroAssembler(cb).bind( blk_labels[_cfg->_num_blocks] ); | |
1397 | |
1398 // Compute the size of the first block | |
1399 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos(); | |
1400 | |
1401 assert(cb->code_size() < 500000, "method is unreasonably large"); | |
1402 | |
1403 // ------------------ | |
1404 | |
1405 #ifndef PRODUCT | |
1406 // Information on the size of the method, without the extraneous code | |
1407 Scheduling::increment_method_size(cb->code_size()); | |
1408 #endif | |
1409 | |
1410 // ------------------ | |
1411 // Fill in exception table entries. | |
1412 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels); | |
1413 | |
1414 // Only java methods have exception handlers and deopt handlers | |
1415 if (_method) { | |
1416 // Emit the exception handler code. | |
1417 _code_offsets.set_value(CodeOffsets::Exceptions, emit_exception_handler(*cb)); | |
1418 // Emit the deopt handler code. | |
1419 _code_offsets.set_value(CodeOffsets::Deopt, emit_deopt_handler(*cb)); | |
1420 } | |
1421 | |
1422 // One last check for failed CodeBuffer::expand: | |
1423 if (cb->blob() == NULL) { | |
1424 turn_off_compiler(this); | |
1425 return; | |
1426 } | |
1427 | |
1428 #ifndef PRODUCT | |
1429 // Dump the assembly code, including basic-block numbers | |
1430 if (print_assembly()) { | |
1431 ttyLocker ttyl; // keep the following output all in one block | |
1432 if (!VMThread::should_terminate()) { // test this under the tty lock | |
1433 // This output goes directly to the tty, not the compiler log. | |
1434 // To enable tools to match it up with the compilation activity, | |
1435 // be sure to tag this tty output with the compile ID. | |
1436 if (xtty != NULL) { | |
1437 xtty->head("opto_assembly compile_id='%d'%s", compile_id(), | |
1438 is_osr_compilation() ? " compile_kind='osr'" : | |
1439 ""); | |
1440 } | |
1441 if (method() != NULL) { | |
1442 method()->print_oop(); | |
1443 print_codes(); | |
1444 } | |
1445 dump_asm(node_offsets, node_offset_limit); | |
1446 if (xtty != NULL) { | |
1447 xtty->tail("opto_assembly"); | |
1448 } | |
1449 } | |
1450 } | |
1451 #endif | |
1452 | |
1453 } | |
1454 | |
1455 void Compile::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) { | |
1456 _inc_table.set_size(cnt); | |
1457 | |
1458 uint inct_cnt = 0; | |
1459 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
1460 Block *b = _cfg->_blocks[i]; | |
1461 Node *n = NULL; | |
1462 int j; | |
1463 | |
1464 // Find the branch; ignore trailing NOPs. | |
1465 for( j = b->_nodes.size()-1; j>=0; j-- ) { | |
1466 n = b->_nodes[j]; | |
1467 if( !n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con ) | |
1468 break; | |
1469 } | |
1470 | |
1471 // If we didn't find anything, continue | |
1472 if( j < 0 ) continue; | |
1473 | |
1474 // Compute ExceptionHandlerTable subtable entry and add it | |
1475 // (skip empty blocks) | |
1476 if( n->is_Catch() ) { | |
1477 | |
1478 // Get the offset of the return from the call | |
1479 uint call_return = call_returns[b->_pre_order]; | |
1480 #ifdef ASSERT | |
1481 assert( call_return > 0, "no call seen for this basic block" ); | |
1482 while( b->_nodes[--j]->Opcode() == Op_MachProj ) ; | |
1483 assert( b->_nodes[j]->is_Call(), "CatchProj must follow call" ); | |
1484 #endif | |
1485 // last instruction is a CatchNode, find it's CatchProjNodes | |
1486 int nof_succs = b->_num_succs; | |
1487 // allocate space | |
1488 GrowableArray<intptr_t> handler_bcis(nof_succs); | |
1489 GrowableArray<intptr_t> handler_pcos(nof_succs); | |
1490 // iterate through all successors | |
1491 for (int j = 0; j < nof_succs; j++) { | |
1492 Block* s = b->_succs[j]; | |
1493 bool found_p = false; | |
1494 for( uint k = 1; k < s->num_preds(); k++ ) { | |
1495 Node *pk = s->pred(k); | |
1496 if( pk->is_CatchProj() && pk->in(0) == n ) { | |
1497 const CatchProjNode* p = pk->as_CatchProj(); | |
1498 found_p = true; | |
1499 // add the corresponding handler bci & pco information | |
1500 if( p->_con != CatchProjNode::fall_through_index ) { | |
1501 // p leads to an exception handler (and is not fall through) | |
1502 assert(s == _cfg->_blocks[s->_pre_order],"bad numbering"); | |
1503 // no duplicates, please | |
1504 if( !handler_bcis.contains(p->handler_bci()) ) { | |
1505 uint block_num = s->non_connector()->_pre_order; | |
1506 handler_bcis.append(p->handler_bci()); | |
1507 handler_pcos.append(blk_labels[block_num].loc_pos()); | |
1508 } | |
1509 } | |
1510 } | |
1511 } | |
1512 assert(found_p, "no matching predecessor found"); | |
1513 // Note: Due to empty block removal, one block may have | |
1514 // several CatchProj inputs, from the same Catch. | |
1515 } | |
1516 | |
1517 // Set the offset of the return from the call | |
1518 _handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos); | |
1519 continue; | |
1520 } | |
1521 | |
1522 // Handle implicit null exception table updates | |
1523 if( n->is_MachNullCheck() ) { | |
1524 uint block_num = b->non_connector_successor(0)->_pre_order; | |
1525 _inc_table.append( inct_starts[inct_cnt++], blk_labels[block_num].loc_pos() ); | |
1526 continue; | |
1527 } | |
1528 } // End of for all blocks fill in exception table entries | |
1529 } | |
1530 | |
1531 // Static Variables | |
1532 #ifndef PRODUCT | |
1533 uint Scheduling::_total_nop_size = 0; | |
1534 uint Scheduling::_total_method_size = 0; | |
1535 uint Scheduling::_total_branches = 0; | |
1536 uint Scheduling::_total_unconditional_delays = 0; | |
1537 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1]; | |
1538 #endif | |
1539 | |
1540 // Initializer for class Scheduling | |
1541 | |
1542 Scheduling::Scheduling(Arena *arena, Compile &compile) | |
1543 : _arena(arena), | |
1544 _cfg(compile.cfg()), | |
1545 _bbs(compile.cfg()->_bbs), | |
1546 _regalloc(compile.regalloc()), | |
1547 _reg_node(arena), | |
1548 _bundle_instr_count(0), | |
1549 _bundle_cycle_number(0), | |
1550 _scheduled(arena), | |
1551 _available(arena), | |
1552 _next_node(NULL), | |
1553 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0]), | |
1554 _pinch_free_list(arena) | |
1555 #ifndef PRODUCT | |
1556 , _branches(0) | |
1557 , _unconditional_delays(0) | |
1558 #endif | |
1559 { | |
1560 // Create a MachNopNode | |
1561 _nop = new (&compile) MachNopNode(); | |
1562 | |
1563 // Now that the nops are in the array, save the count | |
1564 // (but allow entries for the nops) | |
1565 _node_bundling_limit = compile.unique(); | |
1566 uint node_max = _regalloc->node_regs_max_index(); | |
1567 | |
1568 compile.set_node_bundling_limit(_node_bundling_limit); | |
1569 | |
1570 // This one is persistant within the Compile class | |
1571 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max); | |
1572 | |
1573 // Allocate space for fixed-size arrays | |
1574 _node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
1575 _uses = NEW_ARENA_ARRAY(arena, short, node_max); | |
1576 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
1577 | |
1578 // Clear the arrays | |
1579 memset(_node_bundling_base, 0, node_max * sizeof(Bundle)); | |
1580 memset(_node_latency, 0, node_max * sizeof(unsigned short)); | |
1581 memset(_uses, 0, node_max * sizeof(short)); | |
1582 memset(_current_latency, 0, node_max * sizeof(unsigned short)); | |
1583 | |
1584 // Clear the bundling information | |
1585 memcpy(_bundle_use_elements, | |
1586 Pipeline_Use::elaborated_elements, | |
1587 sizeof(Pipeline_Use::elaborated_elements)); | |
1588 | |
1589 // Get the last node | |
1590 Block *bb = _cfg->_blocks[_cfg->_blocks.size()-1]; | |
1591 | |
1592 _next_node = bb->_nodes[bb->_nodes.size()-1]; | |
1593 } | |
1594 | |
1595 #ifndef PRODUCT | |
1596 // Scheduling destructor | |
1597 Scheduling::~Scheduling() { | |
1598 _total_branches += _branches; | |
1599 _total_unconditional_delays += _unconditional_delays; | |
1600 } | |
1601 #endif | |
1602 | |
1603 // Step ahead "i" cycles | |
1604 void Scheduling::step(uint i) { | |
1605 | |
1606 Bundle *bundle = node_bundling(_next_node); | |
1607 bundle->set_starts_bundle(); | |
1608 | |
1609 // Update the bundle record, but leave the flags information alone | |
1610 if (_bundle_instr_count > 0) { | |
1611 bundle->set_instr_count(_bundle_instr_count); | |
1612 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
1613 } | |
1614 | |
1615 // Update the state information | |
1616 _bundle_instr_count = 0; | |
1617 _bundle_cycle_number += i; | |
1618 _bundle_use.step(i); | |
1619 } | |
1620 | |
1621 void Scheduling::step_and_clear() { | |
1622 Bundle *bundle = node_bundling(_next_node); | |
1623 bundle->set_starts_bundle(); | |
1624 | |
1625 // Update the bundle record | |
1626 if (_bundle_instr_count > 0) { | |
1627 bundle->set_instr_count(_bundle_instr_count); | |
1628 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
1629 | |
1630 _bundle_cycle_number += 1; | |
1631 } | |
1632 | |
1633 // Clear the bundling information | |
1634 _bundle_instr_count = 0; | |
1635 _bundle_use.reset(); | |
1636 | |
1637 memcpy(_bundle_use_elements, | |
1638 Pipeline_Use::elaborated_elements, | |
1639 sizeof(Pipeline_Use::elaborated_elements)); | |
1640 } | |
1641 | |
1642 //------------------------------ScheduleAndBundle------------------------------ | |
1643 // Perform instruction scheduling and bundling over the sequence of | |
1644 // instructions in backwards order. | |
1645 void Compile::ScheduleAndBundle() { | |
1646 | |
1647 // Don't optimize this if it isn't a method | |
1648 if (!_method) | |
1649 return; | |
1650 | |
1651 // Don't optimize this if scheduling is disabled | |
1652 if (!do_scheduling()) | |
1653 return; | |
1654 | |
1655 NOT_PRODUCT( TracePhase t2("isched", &_t_instrSched, TimeCompiler); ) | |
1656 | |
1657 // Create a data structure for all the scheduling information | |
1658 Scheduling scheduling(Thread::current()->resource_area(), *this); | |
1659 | |
1660 // Walk backwards over each basic block, computing the needed alignment | |
1661 // Walk over all the basic blocks | |
1662 scheduling.DoScheduling(); | |
1663 } | |
1664 | |
1665 //------------------------------ComputeLocalLatenciesForward------------------- | |
1666 // Compute the latency of all the instructions. This is fairly simple, | |
1667 // because we already have a legal ordering. Walk over the instructions | |
1668 // from first to last, and compute the latency of the instruction based | |
1669 // on the latency of the preceeding instruction(s). | |
1670 void Scheduling::ComputeLocalLatenciesForward(const Block *bb) { | |
1671 #ifndef PRODUCT | |
1672 if (_cfg->C->trace_opto_output()) | |
1673 tty->print("# -> ComputeLocalLatenciesForward\n"); | |
1674 #endif | |
1675 | |
1676 // Walk over all the schedulable instructions | |
1677 for( uint j=_bb_start; j < _bb_end; j++ ) { | |
1678 | |
1679 // This is a kludge, forcing all latency calculations to start at 1. | |
1680 // Used to allow latency 0 to force an instruction to the beginning | |
1681 // of the bb | |
1682 uint latency = 1; | |
1683 Node *use = bb->_nodes[j]; | |
1684 uint nlen = use->len(); | |
1685 | |
1686 // Walk over all the inputs | |
1687 for ( uint k=0; k < nlen; k++ ) { | |
1688 Node *def = use->in(k); | |
1689 if (!def) | |
1690 continue; | |
1691 | |
1692 uint l = _node_latency[def->_idx] + use->latency(k); | |
1693 if (latency < l) | |
1694 latency = l; | |
1695 } | |
1696 | |
1697 _node_latency[use->_idx] = latency; | |
1698 | |
1699 #ifndef PRODUCT | |
1700 if (_cfg->C->trace_opto_output()) { | |
1701 tty->print("# latency %4d: ", latency); | |
1702 use->dump(); | |
1703 } | |
1704 #endif | |
1705 } | |
1706 | |
1707 #ifndef PRODUCT | |
1708 if (_cfg->C->trace_opto_output()) | |
1709 tty->print("# <- ComputeLocalLatenciesForward\n"); | |
1710 #endif | |
1711 | |
1712 } // end ComputeLocalLatenciesForward | |
1713 | |
1714 // See if this node fits into the present instruction bundle | |
1715 bool Scheduling::NodeFitsInBundle(Node *n) { | |
1716 uint n_idx = n->_idx; | |
1717 | |
1718 // If this is the unconditional delay instruction, then it fits | |
1719 if (n == _unconditional_delay_slot) { | |
1720 #ifndef PRODUCT | |
1721 if (_cfg->C->trace_opto_output()) | |
1722 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx); | |
1723 #endif | |
1724 return (true); | |
1725 } | |
1726 | |
1727 // If the node cannot be scheduled this cycle, skip it | |
1728 if (_current_latency[n_idx] > _bundle_cycle_number) { | |
1729 #ifndef PRODUCT | |
1730 if (_cfg->C->trace_opto_output()) | |
1731 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n", | |
1732 n->_idx, _current_latency[n_idx], _bundle_cycle_number); | |
1733 #endif | |
1734 return (false); | |
1735 } | |
1736 | |
1737 const Pipeline *node_pipeline = n->pipeline(); | |
1738 | |
1739 uint instruction_count = node_pipeline->instructionCount(); | |
1740 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
1741 instruction_count = 0; | |
1742 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
1743 instruction_count++; | |
1744 | |
1745 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) { | |
1746 #ifndef PRODUCT | |
1747 if (_cfg->C->trace_opto_output()) | |
1748 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n", | |
1749 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle); | |
1750 #endif | |
1751 return (false); | |
1752 } | |
1753 | |
1754 // Don't allow non-machine nodes to be handled this way | |
1755 if (!n->is_Mach() && instruction_count == 0) | |
1756 return (false); | |
1757 | |
1758 // See if there is any overlap | |
1759 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse()); | |
1760 | |
1761 if (delay > 0) { | |
1762 #ifndef PRODUCT | |
1763 if (_cfg->C->trace_opto_output()) | |
1764 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx); | |
1765 #endif | |
1766 return false; | |
1767 } | |
1768 | |
1769 #ifndef PRODUCT | |
1770 if (_cfg->C->trace_opto_output()) | |
1771 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx); | |
1772 #endif | |
1773 | |
1774 return true; | |
1775 } | |
1776 | |
1777 Node * Scheduling::ChooseNodeToBundle() { | |
1778 uint siz = _available.size(); | |
1779 | |
1780 if (siz == 0) { | |
1781 | |
1782 #ifndef PRODUCT | |
1783 if (_cfg->C->trace_opto_output()) | |
1784 tty->print("# ChooseNodeToBundle: NULL\n"); | |
1785 #endif | |
1786 return (NULL); | |
1787 } | |
1788 | |
1789 // Fast path, if only 1 instruction in the bundle | |
1790 if (siz == 1) { | |
1791 #ifndef PRODUCT | |
1792 if (_cfg->C->trace_opto_output()) { | |
1793 tty->print("# ChooseNodeToBundle (only 1): "); | |
1794 _available[0]->dump(); | |
1795 } | |
1796 #endif | |
1797 return (_available[0]); | |
1798 } | |
1799 | |
1800 // Don't bother, if the bundle is already full | |
1801 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) { | |
1802 for ( uint i = 0; i < siz; i++ ) { | |
1803 Node *n = _available[i]; | |
1804 | |
1805 // Skip projections, we'll handle them another way | |
1806 if (n->is_Proj()) | |
1807 continue; | |
1808 | |
1809 // This presupposed that instructions are inserted into the | |
1810 // available list in a legality order; i.e. instructions that | |
1811 // must be inserted first are at the head of the list | |
1812 if (NodeFitsInBundle(n)) { | |
1813 #ifndef PRODUCT | |
1814 if (_cfg->C->trace_opto_output()) { | |
1815 tty->print("# ChooseNodeToBundle: "); | |
1816 n->dump(); | |
1817 } | |
1818 #endif | |
1819 return (n); | |
1820 } | |
1821 } | |
1822 } | |
1823 | |
1824 // Nothing fits in this bundle, choose the highest priority | |
1825 #ifndef PRODUCT | |
1826 if (_cfg->C->trace_opto_output()) { | |
1827 tty->print("# ChooseNodeToBundle: "); | |
1828 _available[0]->dump(); | |
1829 } | |
1830 #endif | |
1831 | |
1832 return _available[0]; | |
1833 } | |
1834 | |
1835 //------------------------------AddNodeToAvailableList------------------------- | |
1836 void Scheduling::AddNodeToAvailableList(Node *n) { | |
1837 assert( !n->is_Proj(), "projections never directly made available" ); | |
1838 #ifndef PRODUCT | |
1839 if (_cfg->C->trace_opto_output()) { | |
1840 tty->print("# AddNodeToAvailableList: "); | |
1841 n->dump(); | |
1842 } | |
1843 #endif | |
1844 | |
1845 int latency = _current_latency[n->_idx]; | |
1846 | |
1847 // Insert in latency order (insertion sort) | |
1848 uint i; | |
1849 for ( i=0; i < _available.size(); i++ ) | |
1850 if (_current_latency[_available[i]->_idx] > latency) | |
1851 break; | |
1852 | |
1853 // Special Check for compares following branches | |
1854 if( n->is_Mach() && _scheduled.size() > 0 ) { | |
1855 int op = n->as_Mach()->ideal_Opcode(); | |
1856 Node *last = _scheduled[0]; | |
1857 if( last->is_MachIf() && last->in(1) == n && | |
1858 ( op == Op_CmpI || | |
1859 op == Op_CmpU || | |
1860 op == Op_CmpP || | |
1861 op == Op_CmpF || | |
1862 op == Op_CmpD || | |
1863 op == Op_CmpL ) ) { | |
1864 | |
1865 // Recalculate position, moving to front of same latency | |
1866 for ( i=0 ; i < _available.size(); i++ ) | |
1867 if (_current_latency[_available[i]->_idx] >= latency) | |
1868 break; | |
1869 } | |
1870 } | |
1871 | |
1872 // Insert the node in the available list | |
1873 _available.insert(i, n); | |
1874 | |
1875 #ifndef PRODUCT | |
1876 if (_cfg->C->trace_opto_output()) | |
1877 dump_available(); | |
1878 #endif | |
1879 } | |
1880 | |
1881 //------------------------------DecrementUseCounts----------------------------- | |
1882 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) { | |
1883 for ( uint i=0; i < n->len(); i++ ) { | |
1884 Node *def = n->in(i); | |
1885 if (!def) continue; | |
1886 if( def->is_Proj() ) // If this is a machine projection, then | |
1887 def = def->in(0); // propagate usage thru to the base instruction | |
1888 | |
1889 if( _bbs[def->_idx] != bb ) // Ignore if not block-local | |
1890 continue; | |
1891 | |
1892 // Compute the latency | |
1893 uint l = _bundle_cycle_number + n->latency(i); | |
1894 if (_current_latency[def->_idx] < l) | |
1895 _current_latency[def->_idx] = l; | |
1896 | |
1897 // If this does not have uses then schedule it | |
1898 if ((--_uses[def->_idx]) == 0) | |
1899 AddNodeToAvailableList(def); | |
1900 } | |
1901 } | |
1902 | |
1903 //------------------------------AddNodeToBundle-------------------------------- | |
1904 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) { | |
1905 #ifndef PRODUCT | |
1906 if (_cfg->C->trace_opto_output()) { | |
1907 tty->print("# AddNodeToBundle: "); | |
1908 n->dump(); | |
1909 } | |
1910 #endif | |
1911 | |
1912 // Remove this from the available list | |
1913 uint i; | |
1914 for (i = 0; i < _available.size(); i++) | |
1915 if (_available[i] == n) | |
1916 break; | |
1917 assert(i < _available.size(), "entry in _available list not found"); | |
1918 _available.remove(i); | |
1919 | |
1920 // See if this fits in the current bundle | |
1921 const Pipeline *node_pipeline = n->pipeline(); | |
1922 const Pipeline_Use& node_usage = node_pipeline->resourceUse(); | |
1923 | |
1924 // Check for instructions to be placed in the delay slot. We | |
1925 // do this before we actually schedule the current instruction, | |
1926 // because the delay slot follows the current instruction. | |
1927 if (Pipeline::_branch_has_delay_slot && | |
1928 node_pipeline->hasBranchDelay() && | |
1929 !_unconditional_delay_slot) { | |
1930 | |
1931 uint siz = _available.size(); | |
1932 | |
1933 // Conditional branches can support an instruction that | |
1934 // is unconditionally executed and not dependant by the | |
1935 // branch, OR a conditionally executed instruction if | |
1936 // the branch is taken. In practice, this means that | |
1937 // the first instruction at the branch target is | |
1938 // copied to the delay slot, and the branch goes to | |
1939 // the instruction after that at the branch target | |
1940 if ( n->is_Mach() && n->is_Branch() ) { | |
1941 | |
1942 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" ); | |
1943 assert( !n->is_Catch(), "should not look for delay slot for Catch" ); | |
1944 | |
1945 #ifndef PRODUCT | |
1946 _branches++; | |
1947 #endif | |
1948 | |
1949 // At least 1 instruction is on the available list | |
1950 // that is not dependant on the branch | |
1951 for (uint i = 0; i < siz; i++) { | |
1952 Node *d = _available[i]; | |
1953 const Pipeline *avail_pipeline = d->pipeline(); | |
1954 | |
1955 // Don't allow safepoints in the branch shadow, that will | |
1956 // cause a number of difficulties | |
1957 if ( avail_pipeline->instructionCount() == 1 && | |
1958 !avail_pipeline->hasMultipleBundles() && | |
1959 !avail_pipeline->hasBranchDelay() && | |
1960 Pipeline::instr_has_unit_size() && | |
1961 d->size(_regalloc) == Pipeline::instr_unit_size() && | |
1962 NodeFitsInBundle(d) && | |
1963 !node_bundling(d)->used_in_delay()) { | |
1964 | |
1965 if (d->is_Mach() && !d->is_MachSafePoint()) { | |
1966 // A node that fits in the delay slot was found, so we need to | |
1967 // set the appropriate bits in the bundle pipeline information so | |
1968 // that it correctly indicates resource usage. Later, when we | |
1969 // attempt to add this instruction to the bundle, we will skip | |
1970 // setting the resource usage. | |
1971 _unconditional_delay_slot = d; | |
1972 node_bundling(n)->set_use_unconditional_delay(); | |
1973 node_bundling(d)->set_used_in_unconditional_delay(); | |
1974 _bundle_use.add_usage(avail_pipeline->resourceUse()); | |
1975 _current_latency[d->_idx] = _bundle_cycle_number; | |
1976 _next_node = d; | |
1977 ++_bundle_instr_count; | |
1978 #ifndef PRODUCT | |
1979 _unconditional_delays++; | |
1980 #endif | |
1981 break; | |
1982 } | |
1983 } | |
1984 } | |
1985 } | |
1986 | |
1987 // No delay slot, add a nop to the usage | |
1988 if (!_unconditional_delay_slot) { | |
1989 // See if adding an instruction in the delay slot will overflow | |
1990 // the bundle. | |
1991 if (!NodeFitsInBundle(_nop)) { | |
1992 #ifndef PRODUCT | |
1993 if (_cfg->C->trace_opto_output()) | |
1994 tty->print("# *** STEP(1 instruction for delay slot) ***\n"); | |
1995 #endif | |
1996 step(1); | |
1997 } | |
1998 | |
1999 _bundle_use.add_usage(_nop->pipeline()->resourceUse()); | |
2000 _next_node = _nop; | |
2001 ++_bundle_instr_count; | |
2002 } | |
2003 | |
2004 // See if the instruction in the delay slot requires a | |
2005 // step of the bundles | |
2006 if (!NodeFitsInBundle(n)) { | |
2007 #ifndef PRODUCT | |
2008 if (_cfg->C->trace_opto_output()) | |
2009 tty->print("# *** STEP(branch won't fit) ***\n"); | |
2010 #endif | |
2011 // Update the state information | |
2012 _bundle_instr_count = 0; | |
2013 _bundle_cycle_number += 1; | |
2014 _bundle_use.step(1); | |
2015 } | |
2016 } | |
2017 | |
2018 // Get the number of instructions | |
2019 uint instruction_count = node_pipeline->instructionCount(); | |
2020 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
2021 instruction_count = 0; | |
2022 | |
2023 // Compute the latency information | |
2024 uint delay = 0; | |
2025 | |
2026 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) { | |
2027 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number; | |
2028 if (relative_latency < 0) | |
2029 relative_latency = 0; | |
2030 | |
2031 delay = _bundle_use.full_latency(relative_latency, node_usage); | |
2032 | |
2033 // Does not fit in this bundle, start a new one | |
2034 if (delay > 0) { | |
2035 step(delay); | |
2036 | |
2037 #ifndef PRODUCT | |
2038 if (_cfg->C->trace_opto_output()) | |
2039 tty->print("# *** STEP(%d) ***\n", delay); | |
2040 #endif | |
2041 } | |
2042 } | |
2043 | |
2044 // If this was placed in the delay slot, ignore it | |
2045 if (n != _unconditional_delay_slot) { | |
2046 | |
2047 if (delay == 0) { | |
2048 if (node_pipeline->hasMultipleBundles()) { | |
2049 #ifndef PRODUCT | |
2050 if (_cfg->C->trace_opto_output()) | |
2051 tty->print("# *** STEP(multiple instructions) ***\n"); | |
2052 #endif | |
2053 step(1); | |
2054 } | |
2055 | |
2056 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) { | |
2057 #ifndef PRODUCT | |
2058 if (_cfg->C->trace_opto_output()) | |
2059 tty->print("# *** STEP(%d >= %d instructions) ***\n", | |
2060 instruction_count + _bundle_instr_count, | |
2061 Pipeline::_max_instrs_per_cycle); | |
2062 #endif | |
2063 step(1); | |
2064 } | |
2065 } | |
2066 | |
2067 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
2068 _bundle_instr_count++; | |
2069 | |
2070 // Set the node's latency | |
2071 _current_latency[n->_idx] = _bundle_cycle_number; | |
2072 | |
2073 // Now merge the functional unit information | |
2074 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) | |
2075 _bundle_use.add_usage(node_usage); | |
2076 | |
2077 // Increment the number of instructions in this bundle | |
2078 _bundle_instr_count += instruction_count; | |
2079 | |
2080 // Remember this node for later | |
2081 if (n->is_Mach()) | |
2082 _next_node = n; | |
2083 } | |
2084 | |
2085 // It's possible to have a BoxLock in the graph and in the _bbs mapping but | |
2086 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks. | |
2087 // 'Schedule' them (basically ignore in the schedule) but do not insert them | |
2088 // into the block. All other scheduled nodes get put in the schedule here. | |
2089 int op = n->Opcode(); | |
2090 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR | |
2091 (op != Op_Node && // Not an unused antidepedence node and | |
2092 // not an unallocated boxlock | |
2093 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) { | |
2094 | |
2095 // Push any trailing projections | |
2096 if( bb->_nodes[bb->_nodes.size()-1] != n ) { | |
2097 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
2098 Node *foi = n->fast_out(i); | |
2099 if( foi->is_Proj() ) | |
2100 _scheduled.push(foi); | |
2101 } | |
2102 } | |
2103 | |
2104 // Put the instruction in the schedule list | |
2105 _scheduled.push(n); | |
2106 } | |
2107 | |
2108 #ifndef PRODUCT | |
2109 if (_cfg->C->trace_opto_output()) | |
2110 dump_available(); | |
2111 #endif | |
2112 | |
2113 // Walk all the definitions, decrementing use counts, and | |
2114 // if a definition has a 0 use count, place it in the available list. | |
2115 DecrementUseCounts(n,bb); | |
2116 } | |
2117 | |
2118 //------------------------------ComputeUseCount-------------------------------- | |
2119 // This method sets the use count within a basic block. We will ignore all | |
2120 // uses outside the current basic block. As we are doing a backwards walk, | |
2121 // any node we reach that has a use count of 0 may be scheduled. This also | |
2122 // avoids the problem of cyclic references from phi nodes, as long as phi | |
2123 // nodes are at the front of the basic block. This method also initializes | |
2124 // the available list to the set of instructions that have no uses within this | |
2125 // basic block. | |
2126 void Scheduling::ComputeUseCount(const Block *bb) { | |
2127 #ifndef PRODUCT | |
2128 if (_cfg->C->trace_opto_output()) | |
2129 tty->print("# -> ComputeUseCount\n"); | |
2130 #endif | |
2131 | |
2132 // Clear the list of available and scheduled instructions, just in case | |
2133 _available.clear(); | |
2134 _scheduled.clear(); | |
2135 | |
2136 // No delay slot specified | |
2137 _unconditional_delay_slot = NULL; | |
2138 | |
2139 #ifdef ASSERT | |
2140 for( uint i=0; i < bb->_nodes.size(); i++ ) | |
2141 assert( _uses[bb->_nodes[i]->_idx] == 0, "_use array not clean" ); | |
2142 #endif | |
2143 | |
2144 // Force the _uses count to never go to zero for unscheduable pieces | |
2145 // of the block | |
2146 for( uint k = 0; k < _bb_start; k++ ) | |
2147 _uses[bb->_nodes[k]->_idx] = 1; | |
2148 for( uint l = _bb_end; l < bb->_nodes.size(); l++ ) | |
2149 _uses[bb->_nodes[l]->_idx] = 1; | |
2150 | |
2151 // Iterate backwards over the instructions in the block. Don't count the | |
2152 // branch projections at end or the block header instructions. | |
2153 for( uint j = _bb_end-1; j >= _bb_start; j-- ) { | |
2154 Node *n = bb->_nodes[j]; | |
2155 if( n->is_Proj() ) continue; // Projections handled another way | |
2156 | |
2157 // Account for all uses | |
2158 for ( uint k = 0; k < n->len(); k++ ) { | |
2159 Node *inp = n->in(k); | |
2160 if (!inp) continue; | |
2161 assert(inp != n, "no cycles allowed" ); | |
2162 if( _bbs[inp->_idx] == bb ) { // Block-local use? | |
2163 if( inp->is_Proj() ) // Skip through Proj's | |
2164 inp = inp->in(0); | |
2165 ++_uses[inp->_idx]; // Count 1 block-local use | |
2166 } | |
2167 } | |
2168 | |
2169 // If this instruction has a 0 use count, then it is available | |
2170 if (!_uses[n->_idx]) { | |
2171 _current_latency[n->_idx] = _bundle_cycle_number; | |
2172 AddNodeToAvailableList(n); | |
2173 } | |
2174 | |
2175 #ifndef PRODUCT | |
2176 if (_cfg->C->trace_opto_output()) { | |
2177 tty->print("# uses: %3d: ", _uses[n->_idx]); | |
2178 n->dump(); | |
2179 } | |
2180 #endif | |
2181 } | |
2182 | |
2183 #ifndef PRODUCT | |
2184 if (_cfg->C->trace_opto_output()) | |
2185 tty->print("# <- ComputeUseCount\n"); | |
2186 #endif | |
2187 } | |
2188 | |
2189 // This routine performs scheduling on each basic block in reverse order, | |
2190 // using instruction latencies and taking into account function unit | |
2191 // availability. | |
2192 void Scheduling::DoScheduling() { | |
2193 #ifndef PRODUCT | |
2194 if (_cfg->C->trace_opto_output()) | |
2195 tty->print("# -> DoScheduling\n"); | |
2196 #endif | |
2197 | |
2198 Block *succ_bb = NULL; | |
2199 Block *bb; | |
2200 | |
2201 // Walk over all the basic blocks in reverse order | |
2202 for( int i=_cfg->_num_blocks-1; i >= 0; succ_bb = bb, i-- ) { | |
2203 bb = _cfg->_blocks[i]; | |
2204 | |
2205 #ifndef PRODUCT | |
2206 if (_cfg->C->trace_opto_output()) { | |
2207 tty->print("# Schedule BB#%03d (initial)\n", i); | |
2208 for (uint j = 0; j < bb->_nodes.size(); j++) | |
2209 bb->_nodes[j]->dump(); | |
2210 } | |
2211 #endif | |
2212 | |
2213 // On the head node, skip processing | |
2214 if( bb == _cfg->_broot ) | |
2215 continue; | |
2216 | |
2217 // Skip empty, connector blocks | |
2218 if (bb->is_connector()) | |
2219 continue; | |
2220 | |
2221 // If the following block is not the sole successor of | |
2222 // this one, then reset the pipeline information | |
2223 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) { | |
2224 #ifndef PRODUCT | |
2225 if (_cfg->C->trace_opto_output()) { | |
2226 tty->print("*** bundle start of next BB, node %d, for %d instructions\n", | |
2227 _next_node->_idx, _bundle_instr_count); | |
2228 } | |
2229 #endif | |
2230 step_and_clear(); | |
2231 } | |
2232 | |
2233 // Leave untouched the starting instruction, any Phis, a CreateEx node | |
2234 // or Top. bb->_nodes[_bb_start] is the first schedulable instruction. | |
2235 _bb_end = bb->_nodes.size()-1; | |
2236 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) { | |
2237 Node *n = bb->_nodes[_bb_start]; | |
2238 // Things not matched, like Phinodes and ProjNodes don't get scheduled. | |
2239 // Also, MachIdealNodes do not get scheduled | |
2240 if( !n->is_Mach() ) continue; // Skip non-machine nodes | |
2241 MachNode *mach = n->as_Mach(); | |
2242 int iop = mach->ideal_Opcode(); | |
2243 if( iop == Op_CreateEx ) continue; // CreateEx is pinned | |
2244 if( iop == Op_Con ) continue; // Do not schedule Top | |
2245 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes | |
2246 mach->pipeline() == MachNode::pipeline_class() && | |
2247 !n->is_SpillCopy() ) // Breakpoints, Prolog, etc | |
2248 continue; | |
2249 break; // Funny loop structure to be sure... | |
2250 } | |
2251 // Compute last "interesting" instruction in block - last instruction we | |
2252 // might schedule. _bb_end points just after last schedulable inst. We | |
2253 // normally schedule conditional branches (despite them being forced last | |
2254 // in the block), because they have delay slots we can fill. Calls all | |
2255 // have their delay slots filled in the template expansions, so we don't | |
2256 // bother scheduling them. | |
2257 Node *last = bb->_nodes[_bb_end]; | |
2258 if( last->is_Catch() || | |
2259 (last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) { | |
2260 // There must be a prior call. Skip it. | |
2261 while( !bb->_nodes[--_bb_end]->is_Call() ) { | |
2262 assert( bb->_nodes[_bb_end]->is_Proj(), "skipping projections after expected call" ); | |
2263 } | |
2264 } else if( last->is_MachNullCheck() ) { | |
2265 // Backup so the last null-checked memory instruction is | |
2266 // outside the schedulable range. Skip over the nullcheck, | |
2267 // projection, and the memory nodes. | |
2268 Node *mem = last->in(1); | |
2269 do { | |
2270 _bb_end--; | |
2271 } while (mem != bb->_nodes[_bb_end]); | |
2272 } else { | |
2273 // Set _bb_end to point after last schedulable inst. | |
2274 _bb_end++; | |
2275 } | |
2276 | |
2277 assert( _bb_start <= _bb_end, "inverted block ends" ); | |
2278 | |
2279 // Compute the register antidependencies for the basic block | |
2280 ComputeRegisterAntidependencies(bb); | |
2281 if (_cfg->C->failing()) return; // too many D-U pinch points | |
2282 | |
2283 // Compute intra-bb latencies for the nodes | |
2284 ComputeLocalLatenciesForward(bb); | |
2285 | |
2286 // Compute the usage within the block, and set the list of all nodes | |
2287 // in the block that have no uses within the block. | |
2288 ComputeUseCount(bb); | |
2289 | |
2290 // Schedule the remaining instructions in the block | |
2291 while ( _available.size() > 0 ) { | |
2292 Node *n = ChooseNodeToBundle(); | |
2293 AddNodeToBundle(n,bb); | |
2294 } | |
2295 | |
2296 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" ); | |
2297 #ifdef ASSERT | |
2298 for( uint l = _bb_start; l < _bb_end; l++ ) { | |
2299 Node *n = bb->_nodes[l]; | |
2300 uint m; | |
2301 for( m = 0; m < _bb_end-_bb_start; m++ ) | |
2302 if( _scheduled[m] == n ) | |
2303 break; | |
2304 assert( m < _bb_end-_bb_start, "instruction missing in schedule" ); | |
2305 } | |
2306 #endif | |
2307 | |
2308 // Now copy the instructions (in reverse order) back to the block | |
2309 for ( uint k = _bb_start; k < _bb_end; k++ ) | |
2310 bb->_nodes.map(k, _scheduled[_bb_end-k-1]); | |
2311 | |
2312 #ifndef PRODUCT | |
2313 if (_cfg->C->trace_opto_output()) { | |
2314 tty->print("# Schedule BB#%03d (final)\n", i); | |
2315 uint current = 0; | |
2316 for (uint j = 0; j < bb->_nodes.size(); j++) { | |
2317 Node *n = bb->_nodes[j]; | |
2318 if( valid_bundle_info(n) ) { | |
2319 Bundle *bundle = node_bundling(n); | |
2320 if (bundle->instr_count() > 0 || bundle->flags() > 0) { | |
2321 tty->print("*** Bundle: "); | |
2322 bundle->dump(); | |
2323 } | |
2324 n->dump(); | |
2325 } | |
2326 } | |
2327 } | |
2328 #endif | |
2329 #ifdef ASSERT | |
2330 verify_good_schedule(bb,"after block local scheduling"); | |
2331 #endif | |
2332 } | |
2333 | |
2334 #ifndef PRODUCT | |
2335 if (_cfg->C->trace_opto_output()) | |
2336 tty->print("# <- DoScheduling\n"); | |
2337 #endif | |
2338 | |
2339 // Record final node-bundling array location | |
2340 _regalloc->C->set_node_bundling_base(_node_bundling_base); | |
2341 | |
2342 } // end DoScheduling | |
2343 | |
2344 //------------------------------verify_good_schedule--------------------------- | |
2345 // Verify that no live-range used in the block is killed in the block by a | |
2346 // wrong DEF. This doesn't verify live-ranges that span blocks. | |
2347 | |
2348 // Check for edge existence. Used to avoid adding redundant precedence edges. | |
2349 static bool edge_from_to( Node *from, Node *to ) { | |
2350 for( uint i=0; i<from->len(); i++ ) | |
2351 if( from->in(i) == to ) | |
2352 return true; | |
2353 return false; | |
2354 } | |
2355 | |
2356 #ifdef ASSERT | |
2357 //------------------------------verify_do_def---------------------------------- | |
2358 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) { | |
2359 // Check for bad kills | |
2360 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow | |
2361 Node *prior_use = _reg_node[def]; | |
2362 if( prior_use && !edge_from_to(prior_use,n) ) { | |
2363 tty->print("%s = ",OptoReg::as_VMReg(def)->name()); | |
2364 n->dump(); | |
2365 tty->print_cr("..."); | |
2366 prior_use->dump(); | |
2367 assert_msg(edge_from_to(prior_use,n),msg); | |
2368 } | |
2369 _reg_node.map(def,NULL); // Kill live USEs | |
2370 } | |
2371 } | |
2372 | |
2373 //------------------------------verify_good_schedule--------------------------- | |
2374 void Scheduling::verify_good_schedule( Block *b, const char *msg ) { | |
2375 | |
2376 // Zap to something reasonable for the verify code | |
2377 _reg_node.clear(); | |
2378 | |
2379 // Walk over the block backwards. Check to make sure each DEF doesn't | |
2380 // kill a live value (other than the one it's supposed to). Add each | |
2381 // USE to the live set. | |
2382 for( uint i = b->_nodes.size()-1; i >= _bb_start; i-- ) { | |
2383 Node *n = b->_nodes[i]; | |
2384 int n_op = n->Opcode(); | |
2385 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
2386 // Fat-proj kills a slew of registers | |
2387 RegMask rm = n->out_RegMask();// Make local copy | |
2388 while( rm.is_NotEmpty() ) { | |
2389 OptoReg::Name kill = rm.find_first_elem(); | |
2390 rm.Remove(kill); | |
2391 verify_do_def( n, kill, msg ); | |
2392 } | |
2393 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes | |
2394 // Get DEF'd registers the normal way | |
2395 verify_do_def( n, _regalloc->get_reg_first(n), msg ); | |
2396 verify_do_def( n, _regalloc->get_reg_second(n), msg ); | |
2397 } | |
2398 | |
2399 // Now make all USEs live | |
2400 for( uint i=1; i<n->req(); i++ ) { | |
2401 Node *def = n->in(i); | |
2402 assert(def != 0, "input edge required"); | |
2403 OptoReg::Name reg_lo = _regalloc->get_reg_first(def); | |
2404 OptoReg::Name reg_hi = _regalloc->get_reg_second(def); | |
2405 if( OptoReg::is_valid(reg_lo) ) { | |
2406 assert_msg(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), msg ); | |
2407 _reg_node.map(reg_lo,n); | |
2408 } | |
2409 if( OptoReg::is_valid(reg_hi) ) { | |
2410 assert_msg(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), msg ); | |
2411 _reg_node.map(reg_hi,n); | |
2412 } | |
2413 } | |
2414 | |
2415 } | |
2416 | |
2417 // Zap to something reasonable for the Antidependence code | |
2418 _reg_node.clear(); | |
2419 } | |
2420 #endif | |
2421 | |
2422 // Conditionally add precedence edges. Avoid putting edges on Projs. | |
2423 static void add_prec_edge_from_to( Node *from, Node *to ) { | |
2424 if( from->is_Proj() ) { // Put precedence edge on Proj's input | |
2425 assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" ); | |
2426 from = from->in(0); | |
2427 } | |
2428 if( from != to && // No cycles (for things like LD L0,[L0+4] ) | |
2429 !edge_from_to( from, to ) ) // Avoid duplicate edge | |
2430 from->add_prec(to); | |
2431 } | |
2432 | |
2433 //------------------------------anti_do_def------------------------------------ | |
2434 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) { | |
2435 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow | |
2436 return; | |
2437 | |
2438 Node *pinch = _reg_node[def_reg]; // Get pinch point | |
2439 if( !pinch || _bbs[pinch->_idx] != b || // No pinch-point yet? | |
2440 is_def ) { // Check for a true def (not a kill) | |
2441 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point | |
2442 return; | |
2443 } | |
2444 | |
2445 Node *kill = def; // Rename 'def' to more descriptive 'kill' | |
2446 debug_only( def = (Node*)0xdeadbeef; ) | |
2447 | |
2448 // After some number of kills there _may_ be a later def | |
2449 Node *later_def = NULL; | |
2450 | |
2451 // Finding a kill requires a real pinch-point. | |
2452 // Check for not already having a pinch-point. | |
2453 // Pinch points are Op_Node's. | |
2454 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point? | |
2455 later_def = pinch; // Must be def/kill as optimistic pinch-point | |
2456 if ( _pinch_free_list.size() > 0) { | |
2457 pinch = _pinch_free_list.pop(); | |
2458 } else { | |
2459 pinch = new (_cfg->C, 1) Node(1); // Pinch point to-be | |
2460 } | |
2461 if (pinch->_idx >= _regalloc->node_regs_max_index()) { | |
2462 _cfg->C->record_method_not_compilable("too many D-U pinch points"); | |
2463 return; | |
2464 } | |
2465 _bbs.map(pinch->_idx,b); // Pretend it's valid in this block (lazy init) | |
2466 _reg_node.map(def_reg,pinch); // Record pinch-point | |
2467 //_regalloc->set_bad(pinch->_idx); // Already initialized this way. | |
2468 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill | |
2469 pinch->init_req(0, _cfg->C->top()); // set not NULL for the next call | |
2470 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch | |
2471 later_def = NULL; // and no later def | |
2472 } | |
2473 pinch->set_req(0,later_def); // Hook later def so we can find it | |
2474 } else { // Else have valid pinch point | |
2475 if( pinch->in(0) ) // If there is a later-def | |
2476 later_def = pinch->in(0); // Get it | |
2477 } | |
2478 | |
2479 // Add output-dependence edge from later def to kill | |
2480 if( later_def ) // If there is some original def | |
2481 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill | |
2482 | |
2483 // See if current kill is also a use, and so is forced to be the pinch-point. | |
2484 if( pinch->Opcode() == Op_Node ) { | |
2485 Node *uses = kill->is_Proj() ? kill->in(0) : kill; | |
2486 for( uint i=1; i<uses->req(); i++ ) { | |
2487 if( _regalloc->get_reg_first(uses->in(i)) == def_reg || | |
2488 _regalloc->get_reg_second(uses->in(i)) == def_reg ) { | |
2489 // Yes, found a use/kill pinch-point | |
2490 pinch->set_req(0,NULL); // | |
2491 pinch->replace_by(kill); // Move anti-dep edges up | |
2492 pinch = kill; | |
2493 _reg_node.map(def_reg,pinch); | |
2494 return; | |
2495 } | |
2496 } | |
2497 } | |
2498 | |
2499 // Add edge from kill to pinch-point | |
2500 add_prec_edge_from_to(kill,pinch); | |
2501 } | |
2502 | |
2503 //------------------------------anti_do_use------------------------------------ | |
2504 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) { | |
2505 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow | |
2506 return; | |
2507 Node *pinch = _reg_node[use_reg]; // Get pinch point | |
2508 // Check for no later def_reg/kill in block | |
2509 if( pinch && _bbs[pinch->_idx] == b && | |
2510 // Use has to be block-local as well | |
2511 _bbs[use->_idx] == b ) { | |
2512 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?) | |
2513 pinch->req() == 1 ) { // pinch not yet in block? | |
2514 pinch->del_req(0); // yank pointer to later-def, also set flag | |
2515 // Insert the pinch-point in the block just after the last use | |
2516 b->_nodes.insert(b->find_node(use)+1,pinch); | |
2517 _bb_end++; // Increase size scheduled region in block | |
2518 } | |
2519 | |
2520 add_prec_edge_from_to(pinch,use); | |
2521 } | |
2522 } | |
2523 | |
2524 //------------------------------ComputeRegisterAntidependences----------------- | |
2525 // We insert antidependences between the reads and following write of | |
2526 // allocated registers to prevent illegal code motion. Hopefully, the | |
2527 // number of added references should be fairly small, especially as we | |
2528 // are only adding references within the current basic block. | |
2529 void Scheduling::ComputeRegisterAntidependencies(Block *b) { | |
2530 | |
2531 #ifdef ASSERT | |
2532 verify_good_schedule(b,"before block local scheduling"); | |
2533 #endif | |
2534 | |
2535 // A valid schedule, for each register independently, is an endless cycle | |
2536 // of: a def, then some uses (connected to the def by true dependencies), | |
2537 // then some kills (defs with no uses), finally the cycle repeats with a new | |
2538 // def. The uses are allowed to float relative to each other, as are the | |
2539 // kills. No use is allowed to slide past a kill (or def). This requires | |
2540 // antidependencies between all uses of a single def and all kills that | |
2541 // follow, up to the next def. More edges are redundant, because later defs | |
2542 // & kills are already serialized with true or antidependencies. To keep | |
2543 // the edge count down, we add a 'pinch point' node if there's more than | |
2544 // one use or more than one kill/def. | |
2545 | |
2546 // We add dependencies in one bottom-up pass. | |
2547 | |
2548 // For each instruction we handle it's DEFs/KILLs, then it's USEs. | |
2549 | |
2550 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this | |
2551 // register. If not, we record the DEF/KILL in _reg_node, the | |
2552 // register-to-def mapping. If there is a prior DEF/KILL, we insert a | |
2553 // "pinch point", a new Node that's in the graph but not in the block. | |
2554 // We put edges from the prior and current DEF/KILLs to the pinch point. | |
2555 // We put the pinch point in _reg_node. If there's already a pinch point | |
2556 // we merely add an edge from the current DEF/KILL to the pinch point. | |
2557 | |
2558 // After doing the DEF/KILLs, we handle USEs. For each used register, we | |
2559 // put an edge from the pinch point to the USE. | |
2560 | |
2561 // To be expedient, the _reg_node array is pre-allocated for the whole | |
2562 // compilation. _reg_node is lazily initialized; it either contains a NULL, | |
2563 // or a valid def/kill/pinch-point, or a leftover node from some prior | |
2564 // block. Leftover node from some prior block is treated like a NULL (no | |
2565 // prior def, so no anti-dependence needed). Valid def is distinguished by | |
2566 // it being in the current block. | |
2567 bool fat_proj_seen = false; | |
2568 uint last_safept = _bb_end-1; | |
2569 Node* end_node = (_bb_end-1 >= _bb_start) ? b->_nodes[last_safept] : NULL; | |
2570 Node* last_safept_node = end_node; | |
2571 for( uint i = _bb_end-1; i >= _bb_start; i-- ) { | |
2572 Node *n = b->_nodes[i]; | |
2573 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges | |
2574 if( n->Opcode() == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
2575 // Fat-proj kills a slew of registers | |
2576 // This can add edges to 'n' and obscure whether or not it was a def, | |
2577 // hence the is_def flag. | |
2578 fat_proj_seen = true; | |
2579 RegMask rm = n->out_RegMask();// Make local copy | |
2580 while( rm.is_NotEmpty() ) { | |
2581 OptoReg::Name kill = rm.find_first_elem(); | |
2582 rm.Remove(kill); | |
2583 anti_do_def( b, n, kill, is_def ); | |
2584 } | |
2585 } else { | |
2586 // Get DEF'd registers the normal way | |
2587 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def ); | |
2588 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def ); | |
2589 } | |
2590 | |
2591 // Check each register used by this instruction for a following DEF/KILL | |
2592 // that must occur afterward and requires an anti-dependence edge. | |
2593 for( uint j=0; j<n->req(); j++ ) { | |
2594 Node *def = n->in(j); | |
2595 if( def ) { | |
2596 assert( def->Opcode() != Op_MachProj || def->ideal_reg() != MachProjNode::fat_proj, "" ); | |
2597 anti_do_use( b, n, _regalloc->get_reg_first(def) ); | |
2598 anti_do_use( b, n, _regalloc->get_reg_second(def) ); | |
2599 } | |
2600 } | |
2601 // Do not allow defs of new derived values to float above GC | |
2602 // points unless the base is definitely available at the GC point. | |
2603 | |
2604 Node *m = b->_nodes[i]; | |
2605 | |
2606 // Add precedence edge from following safepoint to use of derived pointer | |
2607 if( last_safept_node != end_node && | |
2608 m != last_safept_node) { | |
2609 for (uint k = 1; k < m->req(); k++) { | |
2610 const Type *t = m->in(k)->bottom_type(); | |
2611 if( t->isa_oop_ptr() && | |
2612 t->is_ptr()->offset() != 0 ) { | |
2613 last_safept_node->add_prec( m ); | |
2614 break; | |
2615 } | |
2616 } | |
2617 } | |
2618 | |
2619 if( n->jvms() ) { // Precedence edge from derived to safept | |
2620 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use() | |
2621 if( b->_nodes[last_safept] != last_safept_node ) { | |
2622 last_safept = b->find_node(last_safept_node); | |
2623 } | |
2624 for( uint j=last_safept; j > i; j-- ) { | |
2625 Node *mach = b->_nodes[j]; | |
2626 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP ) | |
2627 mach->add_prec( n ); | |
2628 } | |
2629 last_safept = i; | |
2630 last_safept_node = m; | |
2631 } | |
2632 } | |
2633 | |
2634 if (fat_proj_seen) { | |
2635 // Garbage collect pinch nodes that were not consumed. | |
2636 // They are usually created by a fat kill MachProj for a call. | |
2637 garbage_collect_pinch_nodes(); | |
2638 } | |
2639 } | |
2640 | |
2641 //------------------------------garbage_collect_pinch_nodes------------------------------- | |
2642 | |
2643 // Garbage collect pinch nodes for reuse by other blocks. | |
2644 // | |
2645 // The block scheduler's insertion of anti-dependence | |
2646 // edges creates many pinch nodes when the block contains | |
2647 // 2 or more Calls. A pinch node is used to prevent a | |
2648 // combinatorial explosion of edges. If a set of kills for a | |
2649 // register is anti-dependent on a set of uses (or defs), rather | |
2650 // than adding an edge in the graph between each pair of kill | |
2651 // and use (or def), a pinch is inserted between them: | |
2652 // | |
2653 // use1 use2 use3 | |
2654 // \ | / | |
2655 // \ | / | |
2656 // pinch | |
2657 // / | \ | |
2658 // / | \ | |
2659 // kill1 kill2 kill3 | |
2660 // | |
2661 // One pinch node is created per register killed when | |
2662 // the second call is encountered during a backwards pass | |
2663 // over the block. Most of these pinch nodes are never | |
2664 // wired into the graph because the register is never | |
2665 // used or def'ed in the block. | |
2666 // | |
2667 void Scheduling::garbage_collect_pinch_nodes() { | |
2668 #ifndef PRODUCT | |
2669 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:"); | |
2670 #endif | |
2671 int trace_cnt = 0; | |
2672 for (uint k = 0; k < _reg_node.Size(); k++) { | |
2673 Node* pinch = _reg_node[k]; | |
2674 if (pinch != NULL && pinch->Opcode() == Op_Node && | |
2675 // no predecence input edges | |
2676 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) { | |
2677 cleanup_pinch(pinch); | |
2678 _pinch_free_list.push(pinch); | |
2679 _reg_node.map(k, NULL); | |
2680 #ifndef PRODUCT | |
2681 if (_cfg->C->trace_opto_output()) { | |
2682 trace_cnt++; | |
2683 if (trace_cnt > 40) { | |
2684 tty->print("\n"); | |
2685 trace_cnt = 0; | |
2686 } | |
2687 tty->print(" %d", pinch->_idx); | |
2688 } | |
2689 #endif | |
2690 } | |
2691 } | |
2692 #ifndef PRODUCT | |
2693 if (_cfg->C->trace_opto_output()) tty->print("\n"); | |
2694 #endif | |
2695 } | |
2696 | |
2697 // Clean up a pinch node for reuse. | |
2698 void Scheduling::cleanup_pinch( Node *pinch ) { | |
2699 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking"); | |
2700 | |
2701 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) { | |
2702 Node* use = pinch->last_out(i); | |
2703 uint uses_found = 0; | |
2704 for (uint j = use->req(); j < use->len(); j++) { | |
2705 if (use->in(j) == pinch) { | |
2706 use->rm_prec(j); | |
2707 uses_found++; | |
2708 } | |
2709 } | |
2710 assert(uses_found > 0, "must be a precedence edge"); | |
2711 i -= uses_found; // we deleted 1 or more copies of this edge | |
2712 } | |
2713 // May have a later_def entry | |
2714 pinch->set_req(0, NULL); | |
2715 } | |
2716 | |
2717 //------------------------------print_statistics------------------------------- | |
2718 #ifndef PRODUCT | |
2719 | |
2720 void Scheduling::dump_available() const { | |
2721 tty->print("#Availist "); | |
2722 for (uint i = 0; i < _available.size(); i++) | |
2723 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]); | |
2724 tty->cr(); | |
2725 } | |
2726 | |
2727 // Print Scheduling Statistics | |
2728 void Scheduling::print_statistics() { | |
2729 // Print the size added by nops for bundling | |
2730 tty->print("Nops added %d bytes to total of %d bytes", | |
2731 _total_nop_size, _total_method_size); | |
2732 if (_total_method_size > 0) | |
2733 tty->print(", for %.2f%%", | |
2734 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0); | |
2735 tty->print("\n"); | |
2736 | |
2737 // Print the number of branch shadows filled | |
2738 if (Pipeline::_branch_has_delay_slot) { | |
2739 tty->print("Of %d branches, %d had unconditional delay slots filled", | |
2740 _total_branches, _total_unconditional_delays); | |
2741 if (_total_branches > 0) | |
2742 tty->print(", for %.2f%%", | |
2743 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0); | |
2744 tty->print("\n"); | |
2745 } | |
2746 | |
2747 uint total_instructions = 0, total_bundles = 0; | |
2748 | |
2749 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) { | |
2750 uint bundle_count = _total_instructions_per_bundle[i]; | |
2751 total_instructions += bundle_count * i; | |
2752 total_bundles += bundle_count; | |
2753 } | |
2754 | |
2755 if (total_bundles > 0) | |
2756 tty->print("Average ILP (excluding nops) is %.2f\n", | |
2757 ((double)total_instructions) / ((double)total_bundles)); | |
2758 } | |
2759 #endif |