Mercurial > hg > truffle
annotate src/share/vm/opto/output.cpp @ 11239:6c098f64a7a6
added support for handling volatile registers across native runtime calls
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 07 Aug 2013 01:52:44 +0200 |
parents | 836a62f43af9 |
children | 3cce976666d9 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "asm/assembler.inline.hpp" | |
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27 #include "code/compiledIC.hpp" |
1972 | 28 #include "code/debugInfo.hpp" |
29 #include "code/debugInfoRec.hpp" | |
30 #include "compiler/compileBroker.hpp" | |
31 #include "compiler/oopMap.hpp" | |
32 #include "memory/allocation.inline.hpp" | |
33 #include "opto/callnode.hpp" | |
34 #include "opto/cfgnode.hpp" | |
35 #include "opto/locknode.hpp" | |
36 #include "opto/machnode.hpp" | |
37 #include "opto/output.hpp" | |
38 #include "opto/regalloc.hpp" | |
39 #include "opto/runtime.hpp" | |
40 #include "opto/subnode.hpp" | |
41 #include "opto/type.hpp" | |
42 #include "runtime/handles.inline.hpp" | |
43 #include "utilities/xmlstream.hpp" | |
0 | 44 |
45 extern uint size_exception_handler(); | |
46 extern uint size_deopt_handler(); | |
47 | |
48 #ifndef PRODUCT | |
49 #define DEBUG_ARG(x) , x | |
50 #else | |
51 #define DEBUG_ARG(x) | |
52 #endif | |
53 | |
54 extern int emit_exception_handler(CodeBuffer &cbuf); | |
55 extern int emit_deopt_handler(CodeBuffer &cbuf); | |
56 | |
57 //------------------------------Output----------------------------------------- | |
58 // Convert Nodes to instruction bits and pass off to the VM | |
59 void Compile::Output() { | |
60 // RootNode goes | |
61 assert( _cfg->_broot->_nodes.size() == 0, "" ); | |
62 | |
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63 // The number of new nodes (mostly MachNop) is proportional to |
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64 // the number of java calls and inner loops which are aligned. |
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65 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 + |
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66 C->inner_loops()*(OptoLoopAlignment-1)), |
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67 "out of nodes before code generation" ) ) { |
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68 return; |
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69 } |
0 | 70 // Make sure I can find the Start Node |
71 Block_Array& bbs = _cfg->_bbs; | |
72 Block *entry = _cfg->_blocks[1]; | |
73 Block *broot = _cfg->_broot; | |
74 | |
75 const StartNode *start = entry->_nodes[0]->as_Start(); | |
76 | |
77 // Replace StartNode with prolog | |
78 MachPrologNode *prolog = new (this) MachPrologNode(); | |
79 entry->_nodes.map( 0, prolog ); | |
80 bbs.map( prolog->_idx, entry ); | |
81 bbs.map( start->_idx, NULL ); // start is no longer in any block | |
82 | |
83 // Virtual methods need an unverified entry point | |
84 | |
85 if( is_osr_compilation() ) { | |
86 if( PoisonOSREntry ) { | |
87 // TODO: Should use a ShouldNotReachHereNode... | |
88 _cfg->insert( broot, 0, new (this) MachBreakpointNode() ); | |
89 } | |
90 } else { | |
91 if( _method && !_method->flags().is_static() ) { | |
92 // Insert unvalidated entry point | |
93 _cfg->insert( broot, 0, new (this) MachUEPNode() ); | |
94 } | |
95 | |
96 } | |
97 | |
98 | |
99 // Break before main entry point | |
100 if( (_method && _method->break_at_execute()) | |
101 #ifndef PRODUCT | |
102 ||(OptoBreakpoint && is_method_compilation()) | |
103 ||(OptoBreakpointOSR && is_osr_compilation()) | |
104 ||(OptoBreakpointC2R && !_method) | |
105 #endif | |
106 ) { | |
107 // checking for _method means that OptoBreakpoint does not apply to | |
108 // runtime stubs or frame converters | |
109 _cfg->insert( entry, 1, new (this) MachBreakpointNode() ); | |
110 } | |
111 | |
112 // Insert epilogs before every return | |
113 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
114 Block *b = _cfg->_blocks[i]; | |
115 if( !b->is_connector() && b->non_connector_successor(0) == _cfg->_broot ) { // Found a program exit point? | |
116 Node *m = b->end(); | |
117 if( m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt ) { | |
118 MachEpilogNode *epilog = new (this) MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return); | |
119 b->add_inst( epilog ); | |
120 bbs.map(epilog->_idx, b); | |
121 //_regalloc->set_bad(epilog->_idx); // Already initialized this way. | |
122 } | |
123 } | |
124 } | |
125 | |
126 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
127 if ( ZapDeadCompiledLocals ) Insert_zap_nodes(); | |
128 # endif | |
129 | |
3851 | 130 uint* blk_starts = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks+1); |
131 blk_starts[0] = 0; | |
132 | |
133 // Initialize code buffer and process short branches. | |
134 CodeBuffer* cb = init_buffer(blk_starts); | |
135 | |
136 if (cb == NULL || failing()) return; | |
137 | |
0 | 138 ScheduleAndBundle(); |
139 | |
140 #ifndef PRODUCT | |
141 if (trace_opto_output()) { | |
142 tty->print("\n---- After ScheduleAndBundle ----\n"); | |
143 for (uint i = 0; i < _cfg->_num_blocks; i++) { | |
144 tty->print("\nBB#%03d:\n", i); | |
145 Block *bb = _cfg->_blocks[i]; | |
146 for (uint j = 0; j < bb->_nodes.size(); j++) { | |
147 Node *n = bb->_nodes[j]; | |
148 OptoReg::Name reg = _regalloc->get_reg_first(n); | |
149 tty->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : ""); | |
150 n->dump(); | |
151 } | |
152 } | |
153 } | |
154 #endif | |
155 | |
156 if (failing()) return; | |
157 | |
158 BuildOopMaps(); | |
159 | |
160 if (failing()) return; | |
161 | |
3851 | 162 fill_buffer(cb, blk_starts); |
0 | 163 } |
164 | |
165 bool Compile::need_stack_bang(int frame_size_in_bytes) const { | |
166 // Determine if we need to generate a stack overflow check. | |
167 // Do it if the method is not a stub function and | |
168 // has java calls or has frame size > vm_page_size/8. | |
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169 return (UseStackBanging && stub_function() == NULL && |
0 | 170 (has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3)); |
171 } | |
172 | |
173 bool Compile::need_register_stack_bang() const { | |
174 // Determine if we need to generate a register stack overflow check. | |
175 // This is only used on architectures which have split register | |
176 // and memory stacks (ie. IA64). | |
177 // Bang if the method is not a stub function and has java calls | |
178 return (stub_function() == NULL && has_java_calls()); | |
179 } | |
180 | |
181 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
182 | |
183 | |
184 // In order to catch compiler oop-map bugs, we have implemented | |
185 // a debugging mode called ZapDeadCompilerLocals. | |
186 // This mode causes the compiler to insert a call to a runtime routine, | |
187 // "zap_dead_locals", right before each place in compiled code | |
188 // that could potentially be a gc-point (i.e., a safepoint or oop map point). | |
189 // The runtime routine checks that locations mapped as oops are really | |
190 // oops, that locations mapped as values do not look like oops, | |
191 // and that locations mapped as dead are not used later | |
192 // (by zapping them to an invalid address). | |
193 | |
194 int Compile::_CompiledZap_count = 0; | |
195 | |
196 void Compile::Insert_zap_nodes() { | |
197 bool skip = false; | |
198 | |
199 | |
200 // Dink with static counts because code code without the extra | |
201 // runtime calls is MUCH faster for debugging purposes | |
202 | |
203 if ( CompileZapFirst == 0 ) ; // nothing special | |
204 else if ( CompileZapFirst > CompiledZap_count() ) skip = true; | |
205 else if ( CompileZapFirst == CompiledZap_count() ) | |
206 warning("starting zap compilation after skipping"); | |
207 | |
208 if ( CompileZapLast == -1 ) ; // nothing special | |
209 else if ( CompileZapLast < CompiledZap_count() ) skip = true; | |
210 else if ( CompileZapLast == CompiledZap_count() ) | |
211 warning("about to compile last zap"); | |
212 | |
213 ++_CompiledZap_count; // counts skipped zaps, too | |
214 | |
215 if ( skip ) return; | |
216 | |
217 | |
218 if ( _method == NULL ) | |
219 return; // no safepoints/oopmaps emitted for calls in stubs,so we don't care | |
220 | |
221 // Insert call to zap runtime stub before every node with an oop map | |
222 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
223 Block *b = _cfg->_blocks[i]; | |
224 for ( uint j = 0; j < b->_nodes.size(); ++j ) { | |
225 Node *n = b->_nodes[j]; | |
226 | |
227 // Determining if we should insert a zap-a-lot node in output. | |
228 // We do that for all nodes that has oopmap info, except for calls | |
229 // to allocation. Calls to allocation passes in the old top-of-eden pointer | |
230 // and expect the C code to reset it. Hence, there can be no safepoints between | |
231 // the inlined-allocation and the call to new_Java, etc. | |
232 // We also cannot zap monitor calls, as they must hold the microlock | |
233 // during the call to Zap, which also wants to grab the microlock. | |
234 bool insert = n->is_MachSafePoint() && (n->as_MachSafePoint()->oop_map() != NULL); | |
235 if ( insert ) { // it is MachSafePoint | |
236 if ( !n->is_MachCall() ) { | |
237 insert = false; | |
238 } else if ( n->is_MachCall() ) { | |
239 MachCallNode* call = n->as_MachCall(); | |
240 if (call->entry_point() == OptoRuntime::new_instance_Java() || | |
241 call->entry_point() == OptoRuntime::new_array_Java() || | |
242 call->entry_point() == OptoRuntime::multianewarray2_Java() || | |
243 call->entry_point() == OptoRuntime::multianewarray3_Java() || | |
244 call->entry_point() == OptoRuntime::multianewarray4_Java() || | |
245 call->entry_point() == OptoRuntime::multianewarray5_Java() || | |
246 call->entry_point() == OptoRuntime::slow_arraycopy_Java() || | |
247 call->entry_point() == OptoRuntime::complete_monitor_locking_Java() | |
248 ) { | |
249 insert = false; | |
250 } | |
251 } | |
252 if (insert) { | |
253 Node *zap = call_zap_node(n->as_MachSafePoint(), i); | |
254 b->_nodes.insert( j, zap ); | |
255 _cfg->_bbs.map( zap->_idx, b ); | |
256 ++j; | |
257 } | |
258 } | |
259 } | |
260 } | |
261 } | |
262 | |
263 | |
264 Node* Compile::call_zap_node(MachSafePointNode* node_to_check, int block_no) { | |
265 const TypeFunc *tf = OptoRuntime::zap_dead_locals_Type(); | |
266 CallStaticJavaNode* ideal_node = | |
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267 new (this) CallStaticJavaNode( tf, |
0 | 268 OptoRuntime::zap_dead_locals_stub(_method->flags().is_native()), |
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269 "call zap dead locals stub", 0, TypePtr::BOTTOM); |
0 | 270 // We need to copy the OopMap from the site we're zapping at. |
271 // We have to make a copy, because the zap site might not be | |
272 // a call site, and zap_dead is a call site. | |
273 OopMap* clone = node_to_check->oop_map()->deep_copy(); | |
274 | |
275 // Add the cloned OopMap to the zap node | |
276 ideal_node->set_oop_map(clone); | |
277 return _matcher->match_sfpt(ideal_node); | |
278 } | |
279 | |
280 //------------------------------is_node_getting_a_safepoint-------------------- | |
281 bool Compile::is_node_getting_a_safepoint( Node* n) { | |
282 // This code duplicates the logic prior to the call of add_safepoint | |
283 // below in this file. | |
284 if( n->is_MachSafePoint() ) return true; | |
285 return false; | |
286 } | |
287 | |
288 # endif // ENABLE_ZAP_DEAD_LOCALS | |
289 | |
290 //------------------------------compute_loop_first_inst_sizes------------------ | |
418 | 291 // Compute the size of first NumberOfLoopInstrToAlign instructions at the top |
0 | 292 // of a loop. When aligning a loop we need to provide enough instructions |
293 // in cpu's fetch buffer to feed decoders. The loop alignment could be | |
294 // avoided if we have enough instructions in fetch buffer at the head of a loop. | |
295 // By default, the size is set to 999999 by Block's constructor so that | |
296 // a loop will be aligned if the size is not reset here. | |
297 // | |
298 // Note: Mach instructions could contain several HW instructions | |
299 // so the size is estimated only. | |
300 // | |
301 void Compile::compute_loop_first_inst_sizes() { | |
302 // The next condition is used to gate the loop alignment optimization. | |
303 // Don't aligned a loop if there are enough instructions at the head of a loop | |
304 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad | |
305 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is | |
306 // equal to 11 bytes which is the largest address NOP instruction. | |
307 if( MaxLoopPad < OptoLoopAlignment-1 ) { | |
308 uint last_block = _cfg->_num_blocks-1; | |
309 for( uint i=1; i <= last_block; i++ ) { | |
310 Block *b = _cfg->_blocks[i]; | |
311 // Check the first loop's block which requires an alignment. | |
418 | 312 if( b->loop_alignment() > (uint)relocInfo::addr_unit() ) { |
0 | 313 uint sum_size = 0; |
314 uint inst_cnt = NumberOfLoopInstrToAlign; | |
418 | 315 inst_cnt = b->compute_first_inst_size(sum_size, inst_cnt, _regalloc); |
316 | |
317 // Check subsequent fallthrough blocks if the loop's first | |
318 // block(s) does not have enough instructions. | |
319 Block *nb = b; | |
320 while( inst_cnt > 0 && | |
321 i < last_block && | |
322 !_cfg->_blocks[i+1]->has_loop_alignment() && | |
323 !nb->has_successor(b) ) { | |
324 i++; | |
325 nb = _cfg->_blocks[i]; | |
326 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, _regalloc); | |
327 } // while( inst_cnt > 0 && i < last_block ) | |
328 | |
0 | 329 b->set_first_inst_size(sum_size); |
330 } // f( b->head()->is_Loop() ) | |
331 } // for( i <= last_block ) | |
332 } // if( MaxLoopPad < OptoLoopAlignment-1 ) | |
333 } | |
334 | |
3851 | 335 //----------------------shorten_branches--------------------------------------- |
0 | 336 // The architecture description provides short branch variants for some long |
337 // branch instructions. Replace eligible long branches with short branches. | |
3851 | 338 void Compile::shorten_branches(uint* blk_starts, int& code_size, int& reloc_size, int& stub_size) { |
0 | 339 |
340 // ------------------ | |
341 // Compute size of each block, method size, and relocation information size | |
3851 | 342 uint nblocks = _cfg->_num_blocks; |
343 | |
344 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks); | |
345 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks); | |
346 int* jmp_nidx = NEW_RESOURCE_ARRAY(int ,nblocks); | |
347 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); ) | |
348 DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); ) | |
349 | |
350 bool has_short_branch_candidate = false; | |
0 | 351 |
352 // Initialize the sizes to 0 | |
353 code_size = 0; // Size in bytes of generated code | |
354 stub_size = 0; // Size in bytes of all stub entries | |
355 // Size in bytes of all relocation entries, including those in local stubs. | |
356 // Start with 2-bytes of reloc info for the unvalidated entry point | |
357 reloc_size = 1; // Number of relocation entries | |
358 | |
359 // Make three passes. The first computes pessimistic blk_starts, | |
3851 | 360 // relative jmp_offset and reloc_size information. The second performs |
2008 | 361 // short branch substitution using the pessimistic sizing. The |
362 // third inserts nops where needed. | |
0 | 363 |
364 // Step one, perform a pessimistic sizing pass. | |
3851 | 365 uint last_call_adr = max_uint; |
366 uint last_avoid_back_to_back_adr = max_uint; | |
0 | 367 uint nop_size = (new (this) MachNopNode())->size(_regalloc); |
3851 | 368 for (uint i = 0; i < nblocks; i++) { // For all blocks |
0 | 369 Block *b = _cfg->_blocks[i]; |
370 | |
3851 | 371 // During short branch replacement, we store the relative (to blk_starts) |
372 // offset of jump in jmp_offset, rather than the absolute offset of jump. | |
373 // This is so that we do not need to recompute sizes of all nodes when | |
374 // we compute correct blk_starts in our next sizing pass. | |
375 jmp_offset[i] = 0; | |
376 jmp_size[i] = 0; | |
377 jmp_nidx[i] = -1; | |
378 DEBUG_ONLY( jmp_target[i] = 0; ) | |
379 DEBUG_ONLY( jmp_rule[i] = 0; ) | |
380 | |
0 | 381 // Sum all instruction sizes to compute block size |
382 uint last_inst = b->_nodes.size(); | |
383 uint blk_size = 0; | |
3851 | 384 for (uint j = 0; j < last_inst; j++) { |
385 Node* nj = b->_nodes[j]; | |
0 | 386 // Handle machine instruction nodes |
3851 | 387 if (nj->is_Mach()) { |
0 | 388 MachNode *mach = nj->as_Mach(); |
389 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding | |
390 reloc_size += mach->reloc(); | |
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391 if (mach->is_MachCall()) { |
0 | 392 MachCallNode *mcall = mach->as_MachCall(); |
393 // This destination address is NOT PC-relative | |
394 | |
395 mcall->method_set((intptr_t)mcall->entry_point()); | |
396 | |
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397 if (mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method) { |
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398 stub_size += CompiledStaticCall::to_interp_stub_size(); |
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399 reloc_size += CompiledStaticCall::reloc_to_interp_stub(); |
0 | 400 } |
401 } else if (mach->is_MachSafePoint()) { | |
402 // If call/safepoint are adjacent, account for possible | |
403 // nop to disambiguate the two safepoints. | |
3851 | 404 // ScheduleAndBundle() can rearrange nodes in a block, |
405 // check for all offsets inside this block. | |
406 if (last_call_adr >= blk_starts[i]) { | |
407 blk_size += nop_size; | |
408 } | |
409 } | |
410 if (mach->avoid_back_to_back()) { | |
411 // Nop is inserted between "avoid back to back" instructions. | |
412 // ScheduleAndBundle() can rearrange nodes in a block, | |
413 // check for all offsets inside this block. | |
414 if (last_avoid_back_to_back_adr >= blk_starts[i]) { | |
0 | 415 blk_size += nop_size; |
416 } | |
417 } | |
3851 | 418 if (mach->may_be_short_branch()) { |
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419 if (!nj->is_MachBranch()) { |
3851 | 420 #ifndef PRODUCT |
421 nj->dump(3); | |
422 #endif | |
423 Unimplemented(); | |
424 } | |
425 assert(jmp_nidx[i] == -1, "block should have only one branch"); | |
426 jmp_offset[i] = blk_size; | |
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427 jmp_size[i] = nj->size(_regalloc); |
3851 | 428 jmp_nidx[i] = j; |
429 has_short_branch_candidate = true; | |
430 } | |
0 | 431 } |
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432 blk_size += nj->size(_regalloc); |
0 | 433 // Remember end of call offset |
3842 | 434 if (nj->is_MachCall() && !nj->is_MachCallLeaf()) { |
3851 | 435 last_call_adr = blk_starts[i]+blk_size; |
436 } | |
437 // Remember end of avoid_back_to_back offset | |
438 if (nj->is_Mach() && nj->as_Mach()->avoid_back_to_back()) { | |
439 last_avoid_back_to_back_adr = blk_starts[i]+blk_size; | |
0 | 440 } |
441 } | |
442 | |
443 // When the next block starts a loop, we may insert pad NOP | |
444 // instructions. Since we cannot know our future alignment, | |
445 // assume the worst. | |
3851 | 446 if (i< nblocks-1) { |
0 | 447 Block *nb = _cfg->_blocks[i+1]; |
448 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit(); | |
3851 | 449 if (max_loop_pad > 0) { |
0 | 450 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), ""); |
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451 // Adjust last_call_adr and/or last_avoid_back_to_back_adr. |
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452 // If either is the last instruction in this block, bump by |
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453 // max_loop_pad in lock-step with blk_size, so sizing |
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454 // calculations in subsequent blocks still can conservatively |
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455 // detect that it may the last instruction in this block. |
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456 if (last_call_adr == blk_starts[i]+blk_size) { |
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457 last_call_adr += max_loop_pad; |
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458 } |
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459 if (last_avoid_back_to_back_adr == blk_starts[i]+blk_size) { |
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460 last_avoid_back_to_back_adr += max_loop_pad; |
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461 } |
0 | 462 blk_size += max_loop_pad; |
463 } | |
464 } | |
465 | |
466 // Save block size; update total method size | |
467 blk_starts[i+1] = blk_starts[i]+blk_size; | |
468 } | |
469 | |
470 // Step two, replace eligible long jumps. | |
3851 | 471 bool progress = true; |
472 uint last_may_be_short_branch_adr = max_uint; | |
473 while (has_short_branch_candidate && progress) { | |
474 progress = false; | |
475 has_short_branch_candidate = false; | |
476 int adjust_block_start = 0; | |
477 for (uint i = 0; i < nblocks; i++) { | |
478 Block *b = _cfg->_blocks[i]; | |
479 int idx = jmp_nidx[i]; | |
480 MachNode* mach = (idx == -1) ? NULL: b->_nodes[idx]->as_Mach(); | |
481 if (mach != NULL && mach->may_be_short_branch()) { | |
482 #ifdef ASSERT | |
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483 assert(jmp_size[i] > 0 && mach->is_MachBranch(), "sanity"); |
3851 | 484 int j; |
485 // Find the branch; ignore trailing NOPs. | |
486 for (j = b->_nodes.size()-1; j>=0; j--) { | |
487 Node* n = b->_nodes[j]; | |
488 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) | |
489 break; | |
490 } | |
491 assert(j >= 0 && j == idx && b->_nodes[j] == (Node*)mach, "sanity"); | |
492 #endif | |
493 int br_size = jmp_size[i]; | |
494 int br_offs = blk_starts[i] + jmp_offset[i]; | |
495 | |
0 | 496 // This requires the TRUE branch target be in succs[0] |
497 uint bnum = b->non_connector_successor(0)->_pre_order; | |
3851 | 498 int offset = blk_starts[bnum] - br_offs; |
499 if (bnum > i) { // adjust following block's offset | |
500 offset -= adjust_block_start; | |
501 } | |
502 // In the following code a nop could be inserted before | |
503 // the branch which will increase the backward distance. | |
504 bool needs_padding = ((uint)br_offs == last_may_be_short_branch_adr); | |
505 if (needs_padding && offset <= 0) | |
506 offset -= nop_size; | |
507 | |
508 if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) { | |
509 // We've got a winner. Replace this branch. | |
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510 MachNode* replacement = mach->as_MachBranch()->short_branch_version(this); |
3851 | 511 |
512 // Update the jmp_size. | |
513 int new_size = replacement->size(_regalloc); | |
514 int diff = br_size - new_size; | |
515 assert(diff >= (int)nop_size, "short_branch size should be smaller"); | |
516 // Conservatively take into accound padding between | |
517 // avoid_back_to_back branches. Previous branch could be | |
518 // converted into avoid_back_to_back branch during next | |
519 // rounds. | |
520 if (needs_padding && replacement->avoid_back_to_back()) { | |
521 jmp_offset[i] += nop_size; | |
522 diff -= nop_size; | |
0 | 523 } |
3851 | 524 adjust_block_start += diff; |
525 b->_nodes.map(idx, replacement); | |
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526 mach->subsume_by(replacement, C); |
3851 | 527 mach = replacement; |
528 progress = true; | |
529 | |
530 jmp_size[i] = new_size; | |
531 DEBUG_ONLY( jmp_target[i] = bnum; ); | |
532 DEBUG_ONLY( jmp_rule[i] = mach->rule(); ); | |
0 | 533 } else { |
3851 | 534 // The jump distance is not short, try again during next iteration. |
535 has_short_branch_candidate = true; | |
0 | 536 } |
3851 | 537 } // (mach->may_be_short_branch()) |
538 if (mach != NULL && (mach->may_be_short_branch() || | |
539 mach->avoid_back_to_back())) { | |
540 last_may_be_short_branch_adr = blk_starts[i] + jmp_offset[i] + jmp_size[i]; | |
0 | 541 } |
3851 | 542 blk_starts[i+1] -= adjust_block_start; |
0 | 543 } |
544 } | |
545 | |
546 #ifdef ASSERT | |
3851 | 547 for (uint i = 0; i < nblocks; i++) { // For all blocks |
548 if (jmp_target[i] != 0) { | |
549 int br_size = jmp_size[i]; | |
550 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]); | |
551 if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) { | |
552 tty->print_cr("target (%d) - jmp_offset(%d) = offset (%d), jump_size(%d), jmp_block B%d, target_block B%d", blk_starts[jmp_target[i]], blk_starts[i] + jmp_offset[i], offset, br_size, i, jmp_target[i]); | |
0 | 553 } |
3851 | 554 assert(_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset), "Displacement too large for short jmp"); |
0 | 555 } |
556 } | |
557 #endif | |
558 | |
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559 // Step 3, compute the offsets of all blocks, will be done in fill_buffer() |
3851 | 560 // after ScheduleAndBundle(). |
561 | |
0 | 562 // ------------------ |
563 // Compute size for code buffer | |
3851 | 564 code_size = blk_starts[nblocks]; |
0 | 565 |
566 // Relocation records | |
567 reloc_size += 1; // Relo entry for exception handler | |
568 | |
569 // Adjust reloc_size to number of record of relocation info | |
570 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for | |
571 // a relocation index. | |
572 // The CodeBuffer will expand the locs array if this estimate is too low. | |
3851 | 573 reloc_size *= 10 / sizeof(relocInfo); |
574 } | |
575 | |
0 | 576 //------------------------------FillLocArray----------------------------------- |
577 // Create a bit of debug info and append it to the array. The mapping is from | |
578 // Java local or expression stack to constant, register or stack-slot. For | |
579 // doubles, insert 2 mappings and return 1 (to tell the caller that the next | |
580 // entry has been taken care of and caller should skip it). | |
581 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) { | |
582 // This should never have accepted Bad before | |
583 assert(OptoReg::is_valid(regnum), "location must be valid"); | |
584 return (OptoReg::is_reg(regnum)) | |
585 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) ) | |
586 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum))); | |
587 } | |
588 | |
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589 |
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590 ObjectValue* |
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591 Compile::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) { |
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592 for (int i = 0; i < objs->length(); i++) { |
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593 assert(objs->at(i)->is_object(), "corrupt object cache"); |
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594 ObjectValue* sv = (ObjectValue*) objs->at(i); |
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595 if (sv->id() == id) { |
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596 return sv; |
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597 } |
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598 } |
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599 // Otherwise.. |
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600 return NULL; |
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601 } |
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602 |
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603 void Compile::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs, |
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604 ObjectValue* sv ) { |
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605 assert(sv_for_node_id(objs, sv->id()) == NULL, "Precondition"); |
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606 objs->append(sv); |
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607 } |
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608 |
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609 |
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610 void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local, |
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611 GrowableArray<ScopeValue*> *array, |
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612 GrowableArray<ScopeValue*> *objs ) { |
0 | 613 assert( local, "use _top instead of null" ); |
614 if (array->length() != idx) { | |
615 assert(array->length() == idx + 1, "Unexpected array count"); | |
616 // Old functionality: | |
617 // return | |
618 // New functionality: | |
619 // Assert if the local is not top. In product mode let the new node | |
620 // override the old entry. | |
621 assert(local == top(), "LocArray collision"); | |
622 if (local == top()) { | |
623 return; | |
624 } | |
625 array->pop(); | |
626 } | |
627 const Type *t = local->bottom_type(); | |
628 | |
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629 // Is it a safepoint scalar object node? |
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630 if (local->is_SafePointScalarObject()) { |
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631 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject(); |
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632 |
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633 ObjectValue* sv = Compile::sv_for_node_id(objs, spobj->_idx); |
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634 if (sv == NULL) { |
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635 ciKlass* cik = t->is_oopptr()->klass(); |
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636 assert(cik->is_instance_klass() || |
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637 cik->is_array_klass(), "Not supported allocation."); |
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638 sv = new ObjectValue(spobj->_idx, |
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639 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding())); |
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640 Compile::set_sv_for_object_node(objs, sv); |
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641 |
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642 uint first_ind = spobj->first_index(); |
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643 for (uint i = 0; i < spobj->n_fields(); i++) { |
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644 Node* fld_node = sfpt->in(first_ind+i); |
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645 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs); |
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646 } |
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647 } |
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648 array->append(sv); |
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649 return; |
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650 } |
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651 |
0 | 652 // Grab the register number for the local |
653 OptoReg::Name regnum = _regalloc->get_reg_first(local); | |
654 if( OptoReg::is_valid(regnum) ) {// Got a register/stack? | |
655 // Record the double as two float registers. | |
656 // The register mask for such a value always specifies two adjacent | |
657 // float registers, with the lower register number even. | |
658 // Normally, the allocation of high and low words to these registers | |
659 // is irrelevant, because nearly all operations on register pairs | |
660 // (e.g., StoreD) treat them as a single unit. | |
661 // Here, we assume in addition that the words in these two registers | |
662 // stored "naturally" (by operations like StoreD and double stores | |
663 // within the interpreter) such that the lower-numbered register | |
664 // is written to the lower memory address. This may seem like | |
665 // a machine dependency, but it is not--it is a requirement on | |
666 // the author of the <arch>.ad file to ensure that, for every | |
667 // even/odd double-register pair to which a double may be allocated, | |
668 // the word in the even single-register is stored to the first | |
669 // memory word. (Note that register numbers are completely | |
670 // arbitrary, and are not tied to any machine-level encodings.) | |
671 #ifdef _LP64 | |
672 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) { | |
673 array->append(new ConstantIntValue(0)); | |
674 array->append(new_loc_value( _regalloc, regnum, Location::dbl )); | |
675 } else if ( t->base() == Type::Long ) { | |
676 array->append(new ConstantIntValue(0)); | |
677 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
678 } else if ( t->base() == Type::RawPtr ) { | |
679 // jsr/ret return address which must be restored into a the full | |
680 // width 64-bit stack slot. | |
681 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
682 } | |
683 #else //_LP64 | |
684 #ifdef SPARC | |
685 if (t->base() == Type::Long && OptoReg::is_reg(regnum)) { | |
686 // For SPARC we have to swap high and low words for | |
687 // long values stored in a single-register (g0-g7). | |
688 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
689 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
690 } else | |
691 #endif //SPARC | |
692 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) { | |
693 // Repack the double/long as two jints. | |
694 // The convention the interpreter uses is that the second local | |
695 // holds the first raw word of the native double representation. | |
696 // This is actually reasonable, since locals and stack arrays | |
697 // grow downwards in all implementations. | |
698 // (If, on some machine, the interpreter's Java locals or stack | |
699 // were to grow upwards, the embedded doubles would be word-swapped.) | |
700 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
701 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
702 } | |
703 #endif //_LP64 | |
704 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) && | |
705 OptoReg::is_reg(regnum) ) { | |
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706 array->append(new_loc_value( _regalloc, regnum, Matcher::float_in_double() |
0 | 707 ? Location::float_in_dbl : Location::normal )); |
708 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) { | |
709 array->append(new_loc_value( _regalloc, regnum, Matcher::int_in_long | |
710 ? Location::int_in_long : Location::normal )); | |
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711 } else if( t->base() == Type::NarrowOop ) { |
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712 array->append(new_loc_value( _regalloc, regnum, Location::narrowoop )); |
0 | 713 } else { |
714 array->append(new_loc_value( _regalloc, regnum, _regalloc->is_oop(local) ? Location::oop : Location::normal )); | |
715 } | |
716 return; | |
717 } | |
718 | |
719 // No register. It must be constant data. | |
720 switch (t->base()) { | |
721 case Type::Half: // Second half of a double | |
722 ShouldNotReachHere(); // Caller should skip 2nd halves | |
723 break; | |
724 case Type::AnyPtr: | |
725 array->append(new ConstantOopWriteValue(NULL)); | |
726 break; | |
727 case Type::AryPtr: | |
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728 case Type::InstPtr: // fall through |
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729 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->constant_encoding())); |
0 | 730 break; |
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731 case Type::NarrowOop: |
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732 if (t == TypeNarrowOop::NULL_PTR) { |
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733 array->append(new ConstantOopWriteValue(NULL)); |
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734 } else { |
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735 array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->constant_encoding())); |
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736 } |
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737 break; |
0 | 738 case Type::Int: |
739 array->append(new ConstantIntValue(t->is_int()->get_con())); | |
740 break; | |
741 case Type::RawPtr: | |
742 // A return address (T_ADDRESS). | |
743 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI"); | |
744 #ifdef _LP64 | |
745 // Must be restored to the full-width 64-bit stack slot. | |
746 array->append(new ConstantLongValue(t->is_ptr()->get_con())); | |
747 #else | |
748 array->append(new ConstantIntValue(t->is_ptr()->get_con())); | |
749 #endif | |
750 break; | |
751 case Type::FloatCon: { | |
752 float f = t->is_float_constant()->getf(); | |
753 array->append(new ConstantIntValue(jint_cast(f))); | |
754 break; | |
755 } | |
756 case Type::DoubleCon: { | |
757 jdouble d = t->is_double_constant()->getd(); | |
758 #ifdef _LP64 | |
759 array->append(new ConstantIntValue(0)); | |
760 array->append(new ConstantDoubleValue(d)); | |
761 #else | |
762 // Repack the double as two jints. | |
763 // The convention the interpreter uses is that the second local | |
764 // holds the first raw word of the native double representation. | |
765 // This is actually reasonable, since locals and stack arrays | |
766 // grow downwards in all implementations. | |
767 // (If, on some machine, the interpreter's Java locals or stack | |
768 // were to grow upwards, the embedded doubles would be word-swapped.) | |
769 jint *dp = (jint*)&d; | |
770 array->append(new ConstantIntValue(dp[1])); | |
771 array->append(new ConstantIntValue(dp[0])); | |
772 #endif | |
773 break; | |
774 } | |
775 case Type::Long: { | |
776 jlong d = t->is_long()->get_con(); | |
777 #ifdef _LP64 | |
778 array->append(new ConstantIntValue(0)); | |
779 array->append(new ConstantLongValue(d)); | |
780 #else | |
781 // Repack the long as two jints. | |
782 // The convention the interpreter uses is that the second local | |
783 // holds the first raw word of the native double representation. | |
784 // This is actually reasonable, since locals and stack arrays | |
785 // grow downwards in all implementations. | |
786 // (If, on some machine, the interpreter's Java locals or stack | |
787 // were to grow upwards, the embedded doubles would be word-swapped.) | |
788 jint *dp = (jint*)&d; | |
789 array->append(new ConstantIntValue(dp[1])); | |
790 array->append(new ConstantIntValue(dp[0])); | |
791 #endif | |
792 break; | |
793 } | |
794 case Type::Top: // Add an illegal value here | |
795 array->append(new LocationValue(Location())); | |
796 break; | |
797 default: | |
798 ShouldNotReachHere(); | |
799 break; | |
800 } | |
801 } | |
802 | |
803 // Determine if this node starts a bundle | |
804 bool Compile::starts_bundle(const Node *n) const { | |
805 return (_node_bundling_limit > n->_idx && | |
806 _node_bundling_base[n->_idx].starts_bundle()); | |
807 } | |
808 | |
809 //--------------------------Process_OopMap_Node-------------------------------- | |
810 void Compile::Process_OopMap_Node(MachNode *mach, int current_offset) { | |
811 | |
812 // Handle special safepoint nodes for synchronization | |
813 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
814 MachCallNode *mcall; | |
815 | |
816 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
817 assert( is_node_getting_a_safepoint(mach), "logic does not match; false negative"); | |
818 #endif | |
819 | |
820 int safepoint_pc_offset = current_offset; | |
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821 bool is_method_handle_invoke = false; |
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822 bool return_oop = false; |
0 | 823 |
824 // Add the safepoint in the DebugInfoRecorder | |
825 if( !mach->is_MachCall() ) { | |
826 mcall = NULL; | |
827 debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map); | |
828 } else { | |
829 mcall = mach->as_MachCall(); | |
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830 |
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831 // Is the call a MethodHandle call? |
1265 | 832 if (mcall->is_MachCallJava()) { |
833 if (mcall->as_MachCallJava()->_method_handle_invoke) { | |
834 assert(has_method_handle_invokes(), "must have been set during call generation"); | |
835 is_method_handle_invoke = true; | |
836 } | |
837 } | |
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838 |
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839 // Check if a call returns an object. |
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840 if (mcall->return_value_is_used() && |
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841 mcall->tf()->range()->field_at(TypeFunc::Parms)->isa_ptr()) { |
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842 return_oop = true; |
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843 } |
0 | 844 safepoint_pc_offset += mcall->ret_addr_offset(); |
845 debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map); | |
846 } | |
847 | |
848 // Loop over the JVMState list to add scope information | |
849 // Do not skip safepoints with a NULL method, they need monitor info | |
850 JVMState* youngest_jvms = sfn->jvms(); | |
851 int max_depth = youngest_jvms->depth(); | |
852 | |
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853 // Allocate the object pool for scalar-replaced objects -- the map from |
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854 // small-integer keys (which can be recorded in the local and ostack |
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855 // arrays) to descriptions of the object state. |
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856 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>(); |
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857 |
0 | 858 // Visit scopes from oldest to youngest. |
859 for (int depth = 1; depth <= max_depth; depth++) { | |
860 JVMState* jvms = youngest_jvms->of_depth(depth); | |
861 int idx; | |
862 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
863 // Safepoints that do not have method() set only provide oop-map and monitor info | |
864 // to support GC; these do not support deoptimization. | |
865 int num_locs = (method == NULL) ? 0 : jvms->loc_size(); | |
866 int num_exps = (method == NULL) ? 0 : jvms->stk_size(); | |
867 int num_mon = jvms->nof_monitors(); | |
868 assert(method == NULL || jvms->bci() < 0 || num_locs == method->max_locals(), | |
869 "JVMS local count must match that of the method"); | |
870 | |
871 // Add Local and Expression Stack Information | |
872 | |
873 // Insert locals into the locarray | |
874 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs); | |
875 for( idx = 0; idx < num_locs; idx++ ) { | |
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876 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs ); |
0 | 877 } |
878 | |
879 // Insert expression stack entries into the exparray | |
880 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps); | |
881 for( idx = 0; idx < num_exps; idx++ ) { | |
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882 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs ); |
0 | 883 } |
884 | |
885 // Add in mappings of the monitors | |
886 assert( !method || | |
887 !method->is_synchronized() || | |
888 method->is_native() || | |
889 num_mon > 0 || | |
890 !GenerateSynchronizationCode, | |
891 "monitors must always exist for synchronized methods"); | |
892 | |
893 // Build the growable array of ScopeValues for exp stack | |
894 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon); | |
895 | |
896 // Loop over monitors and insert into array | |
897 for(idx = 0; idx < num_mon; idx++) { | |
898 // Grab the node that defines this monitor | |
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899 Node* box_node = sfn->monitor_box(jvms, idx); |
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900 Node* obj_node = sfn->monitor_obj(jvms, idx); |
0 | 901 |
902 // Create ScopeValue for object | |
903 ScopeValue *scval = NULL; | |
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904 |
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905 if( obj_node->is_SafePointScalarObject() ) { |
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906 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject(); |
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907 scval = Compile::sv_for_node_id(objs, spobj->_idx); |
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908 if (scval == NULL) { |
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909 const Type *t = obj_node->bottom_type(); |
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910 ciKlass* cik = t->is_oopptr()->klass(); |
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911 assert(cik->is_instance_klass() || |
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912 cik->is_array_klass(), "Not supported allocation."); |
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913 ObjectValue* sv = new ObjectValue(spobj->_idx, |
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914 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding())); |
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915 Compile::set_sv_for_object_node(objs, sv); |
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916 |
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917 uint first_ind = spobj->first_index(); |
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918 for (uint i = 0; i < spobj->n_fields(); i++) { |
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919 Node* fld_node = sfn->in(first_ind+i); |
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920 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs); |
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921 } |
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922 scval = sv; |
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923 } |
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924 } else if( !obj_node->is_Con() ) { |
0 | 925 OptoReg::Name obj_reg = _regalloc->get_reg_first(obj_node); |
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926 if( obj_node->bottom_type()->base() == Type::NarrowOop ) { |
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927 scval = new_loc_value( _regalloc, obj_reg, Location::narrowoop ); |
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928 } else { |
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929 scval = new_loc_value( _regalloc, obj_reg, Location::oop ); |
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930 } |
0 | 931 } else { |
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932 const TypePtr *tp = obj_node->get_ptr_type(); |
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933 scval = new ConstantOopWriteValue(tp->is_oopptr()->const_oop()->constant_encoding()); |
0 | 934 } |
935 | |
4777 | 936 OptoReg::Name box_reg = BoxLockNode::reg(box_node); |
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937 Location basic_lock = Location::new_stk_loc(Location::normal,_regalloc->reg2offset(box_reg)); |
4777 | 938 bool eliminated = (box_node->is_BoxLock() && box_node->as_BoxLock()->is_eliminated()); |
939 monarray->append(new MonitorValue(scval, basic_lock, eliminated)); | |
0 | 940 } |
941 | |
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942 // We dump the object pool first, since deoptimization reads it in first. |
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943 debug_info()->dump_object_pool(objs); |
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944 |
0 | 945 // Build first class objects to pass to scope |
946 DebugToken *locvals = debug_info()->create_scope_values(locarray); | |
947 DebugToken *expvals = debug_info()->create_scope_values(exparray); | |
948 DebugToken *monvals = debug_info()->create_monitor_values(monarray); | |
949 | |
950 // Make method available for all Safepoints | |
951 ciMethod* scope_method = method ? method : _method; | |
952 // Describe the scope here | |
953 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI"); | |
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954 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest"); |
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955 // Now we can describe the scope. |
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956 methodHandle null_mh; |
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957 bool rethrow_exception = false; |
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958 debug_info()->describe_scope(safepoint_pc_offset, null_mh, scope_method, jvms->bci(), jvms->should_reexecute(), rethrow_exception, is_method_handle_invoke, return_oop, locvals, expvals, monvals); |
0 | 959 } // End jvms loop |
960 | |
961 // Mark the end of the scope set. | |
962 debug_info()->end_safepoint(safepoint_pc_offset); | |
963 } | |
964 | |
965 | |
966 | |
967 // A simplified version of Process_OopMap_Node, to handle non-safepoints. | |
968 class NonSafepointEmitter { | |
969 Compile* C; | |
970 JVMState* _pending_jvms; | |
971 int _pending_offset; | |
972 | |
973 void emit_non_safepoint(); | |
974 | |
975 public: | |
976 NonSafepointEmitter(Compile* compile) { | |
977 this->C = compile; | |
978 _pending_jvms = NULL; | |
979 _pending_offset = 0; | |
980 } | |
981 | |
982 void observe_instruction(Node* n, int pc_offset) { | |
983 if (!C->debug_info()->recording_non_safepoints()) return; | |
984 | |
985 Node_Notes* nn = C->node_notes_at(n->_idx); | |
986 if (nn == NULL || nn->jvms() == NULL) return; | |
987 if (_pending_jvms != NULL && | |
988 _pending_jvms->same_calls_as(nn->jvms())) { | |
989 // Repeated JVMS? Stretch it up here. | |
990 _pending_offset = pc_offset; | |
991 } else { | |
992 if (_pending_jvms != NULL && | |
993 _pending_offset < pc_offset) { | |
994 emit_non_safepoint(); | |
995 } | |
996 _pending_jvms = NULL; | |
997 if (pc_offset > C->debug_info()->last_pc_offset()) { | |
998 // This is the only way _pending_jvms can become non-NULL: | |
999 _pending_jvms = nn->jvms(); | |
1000 _pending_offset = pc_offset; | |
1001 } | |
1002 } | |
1003 } | |
1004 | |
1005 // Stay out of the way of real safepoints: | |
1006 void observe_safepoint(JVMState* jvms, int pc_offset) { | |
1007 if (_pending_jvms != NULL && | |
1008 !_pending_jvms->same_calls_as(jvms) && | |
1009 _pending_offset < pc_offset) { | |
1010 emit_non_safepoint(); | |
1011 } | |
1012 _pending_jvms = NULL; | |
1013 } | |
1014 | |
1015 void flush_at_end() { | |
1016 if (_pending_jvms != NULL) { | |
1017 emit_non_safepoint(); | |
1018 } | |
1019 _pending_jvms = NULL; | |
1020 } | |
1021 }; | |
1022 | |
1023 void NonSafepointEmitter::emit_non_safepoint() { | |
1024 JVMState* youngest_jvms = _pending_jvms; | |
1025 int pc_offset = _pending_offset; | |
1026 | |
1027 // Clear it now: | |
1028 _pending_jvms = NULL; | |
1029 | |
1030 DebugInformationRecorder* debug_info = C->debug_info(); | |
1031 assert(debug_info->recording_non_safepoints(), "sanity"); | |
1032 | |
1033 debug_info->add_non_safepoint(pc_offset); | |
1034 int max_depth = youngest_jvms->depth(); | |
1035 | |
1036 // Visit scopes from oldest to youngest. | |
1037 for (int depth = 1; depth <= max_depth; depth++) { | |
1038 JVMState* jvms = youngest_jvms->of_depth(depth); | |
1039 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
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1040 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest"); |
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1041 methodHandle null_mh; |
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1042 debug_info->describe_scope(pc_offset, null_mh, method, jvms->bci(), jvms->should_reexecute()); |
0 | 1043 } |
1044 | |
1045 // Mark the end of the scope set. | |
1046 debug_info->end_non_safepoint(pc_offset); | |
1047 } | |
1048 | |
3851 | 1049 //------------------------------init_buffer------------------------------------ |
1050 CodeBuffer* Compile::init_buffer(uint* blk_starts) { | |
0 | 1051 |
1052 // Set the initially allocated size | |
1053 int code_req = initial_code_capacity; | |
1054 int locs_req = initial_locs_capacity; | |
1055 int stub_req = TraceJumps ? initial_stub_capacity * 10 : initial_stub_capacity; | |
1056 int const_req = initial_const_capacity; | |
1057 | |
1058 int pad_req = NativeCall::instruction_size; | |
1059 // The extra spacing after the code is necessary on some platforms. | |
1060 // Sometimes we need to patch in a jump after the last instruction, | |
1061 // if the nmethod has been deoptimized. (See 4932387, 4894843.) | |
1062 | |
1063 // Compute the byte offset where we can store the deopt pc. | |
1064 if (fixed_slots() != 0) { | |
1065 _orig_pc_slot_offset_in_bytes = _regalloc->reg2offset(OptoReg::stack2reg(_orig_pc_slot)); | |
1066 } | |
1067 | |
1068 // Compute prolog code size | |
1069 _method_size = 0; | |
1070 _frame_slots = OptoReg::reg2stack(_matcher->_old_SP)+_regalloc->_framesize; | |
1071 #ifdef IA64 | |
1072 if (save_argument_registers()) { | |
1073 // 4815101: this is a stub with implicit and unknown precision fp args. | |
1074 // The usual spill mechanism can only generate stfd's in this case, which | |
1075 // doesn't work if the fp reg to spill contains a single-precision denorm. | |
1076 // Instead, we hack around the normal spill mechanism using stfspill's and | |
1077 // ldffill's in the MachProlog and MachEpilog emit methods. We allocate | |
1078 // space here for the fp arg regs (f8-f15) we're going to thusly spill. | |
1079 // | |
1080 // If we ever implement 16-byte 'registers' == stack slots, we can | |
1081 // get rid of this hack and have SpillCopy generate stfspill/ldffill | |
1082 // instead of stfd/stfs/ldfd/ldfs. | |
1083 _frame_slots += 8*(16/BytesPerInt); | |
1084 } | |
1085 #endif | |
3851 | 1086 assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check"); |
0 | 1087 |
2008 | 1088 if (has_mach_constant_base_node()) { |
1089 // Fill the constant table. | |
3851 | 1090 // Note: This must happen before shorten_branches. |
1091 for (uint i = 0; i < _cfg->_num_blocks; i++) { | |
2008 | 1092 Block* b = _cfg->_blocks[i]; |
1093 | |
1094 for (uint j = 0; j < b->_nodes.size(); j++) { | |
1095 Node* n = b->_nodes[j]; | |
1096 | |
1097 // If the node is a MachConstantNode evaluate the constant | |
1098 // value section. | |
1099 if (n->is_MachConstant()) { | |
1100 MachConstantNode* machcon = n->as_MachConstant(); | |
1101 machcon->eval_constant(C); | |
1102 } | |
1103 } | |
1104 } | |
1105 | |
1106 // Calculate the offsets of the constants and the size of the | |
1107 // constant table (including the padding to the next section). | |
1108 constant_table().calculate_offsets_and_size(); | |
1109 const_req = constant_table().size(); | |
1110 } | |
1111 | |
1112 // Initialize the space for the BufferBlob used to find and verify | |
1113 // instruction size in MachNode::emit_size() | |
1114 init_scratch_buffer_blob(const_req); | |
3851 | 1115 if (failing()) return NULL; // Out of memory |
1116 | |
1117 // Pre-compute the length of blocks and replace | |
1118 // long branches with short if machine supports it. | |
1119 shorten_branches(blk_starts, code_req, locs_req, stub_req); | |
0 | 1120 |
1121 // nmethod and CodeBuffer count stubs & constants as part of method's code. | |
1122 int exception_handler_req = size_exception_handler(); | |
1123 int deopt_handler_req = size_deopt_handler(); | |
1124 exception_handler_req += MAX_stubs_size; // add marginal slop for handler | |
1125 deopt_handler_req += MAX_stubs_size; // add marginal slop for handler | |
1126 stub_req += MAX_stubs_size; // ensure per-stub margin | |
1127 code_req += MAX_inst_size; // ensure per-instruction margin | |
1265 | 1128 |
0 | 1129 if (StressCodeBuffers) |
1130 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion | |
1265 | 1131 |
1132 int total_req = | |
2008 | 1133 const_req + |
1265 | 1134 code_req + |
1135 pad_req + | |
1136 stub_req + | |
1137 exception_handler_req + | |
2008 | 1138 deopt_handler_req; // deopt handler |
1265 | 1139 |
1140 if (has_method_handle_invokes()) | |
1141 total_req += deopt_handler_req; // deopt MH handler | |
1142 | |
0 | 1143 CodeBuffer* cb = code_buffer(); |
1144 cb->initialize(total_req, locs_req); | |
1145 | |
1146 // Have we run out of code space? | |
1202 | 1147 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
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1148 C->record_failure("CodeCache is full"); |
3851 | 1149 return NULL; |
0 | 1150 } |
1151 // Configure the code buffer. | |
1152 cb->initialize_consts_size(const_req); | |
1153 cb->initialize_stubs_size(stub_req); | |
1154 cb->initialize_oop_recorder(env()->oop_recorder()); | |
1155 | |
1156 // fill in the nop array for bundling computations | |
1157 MachNode *_nop_list[Bundle::_nop_count]; | |
1158 Bundle::initialize_nops(_nop_list, this); | |
1159 | |
3851 | 1160 return cb; |
1161 } | |
1162 | |
1163 //------------------------------fill_buffer------------------------------------ | |
1164 void Compile::fill_buffer(CodeBuffer* cb, uint* blk_starts) { | |
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1165 // blk_starts[] contains offsets calculated during short branches processing, |
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1166 // offsets should not be increased during following steps. |
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1167 |
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1168 // Compute the size of first NumberOfLoopInstrToAlign instructions at head |
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1169 // of a loop. It is used to determine the padding for loop alignment. |
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1170 compute_loop_first_inst_sizes(); |
3851 | 1171 |
0 | 1172 // Create oopmap set. |
1173 _oop_map_set = new OopMapSet(); | |
1174 | |
1175 // !!!!! This preserves old handling of oopmaps for now | |
1176 debug_info()->set_oopmaps(_oop_map_set); | |
1177 | |
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1178 uint nblocks = _cfg->_num_blocks; |
0 | 1179 // Count and start of implicit null check instructions |
1180 uint inct_cnt = 0; | |
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1181 uint *inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1); |
0 | 1182 |
1183 // Count and start of calls | |
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1184 uint *call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1); |
0 | 1185 |
1186 uint return_offset = 0; | |
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1187 int nop_size = (new (this) MachNopNode())->size(_regalloc); |
0 | 1188 |
1189 int previous_offset = 0; | |
1190 int current_offset = 0; | |
1191 int last_call_offset = -1; | |
3851 | 1192 int last_avoid_back_to_back_offset = -1; |
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1193 #ifdef ASSERT |
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1194 uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1195 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1196 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1197 uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); |
3851 | 1198 #endif |
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1199 |
0 | 1200 // Create an array of unused labels, one for each basic block, if printing is enabled |
1201 #ifndef PRODUCT | |
1202 int *node_offsets = NULL; | |
3851 | 1203 uint node_offset_limit = unique(); |
1204 | |
1205 if (print_assembly()) | |
0 | 1206 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit); |
1207 #endif | |
1208 | |
1209 NonSafepointEmitter non_safepoints(this); // emit non-safepoints lazily | |
1210 | |
2008 | 1211 // Emit the constant table. |
1212 if (has_mach_constant_base_node()) { | |
1213 constant_table().emit(*cb); | |
1214 } | |
1215 | |
3851 | 1216 // Create an array of labels, one for each basic block |
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1217 Label *blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1); |
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1218 for (uint i=0; i <= nblocks; i++) { |
3851 | 1219 blk_labels[i].init(); |
1220 } | |
1221 | |
0 | 1222 // ------------------ |
1223 // Now fill in the code buffer | |
1224 Node *delay_slot = NULL; | |
1225 | |
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1226 for (uint i=0; i < nblocks; i++) { |
0 | 1227 Block *b = _cfg->_blocks[i]; |
1228 | |
1229 Node *head = b->head(); | |
1230 | |
1231 // If this block needs to start aligned (i.e, can be reached other | |
1232 // than by falling-thru from the previous block), then force the | |
1233 // start of a new bundle. | |
3851 | 1234 if (Pipeline::requires_bundling() && starts_bundle(head)) |
0 | 1235 cb->flush_bundle(true); |
1236 | |
3851 | 1237 #ifdef ASSERT |
1238 if (!b->is_connector()) { | |
1239 stringStream st; | |
1240 b->dump_head(&_cfg->_bbs, &st); | |
1241 MacroAssembler(cb).block_comment(st.as_string()); | |
1242 } | |
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1243 jmp_target[i] = 0; |
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1244 jmp_offset[i] = 0; |
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1245 jmp_size[i] = 0; |
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1246 jmp_rule[i] = 0; |
3851 | 1247 #endif |
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1248 int blk_offset = current_offset; |
3851 | 1249 |
0 | 1250 // Define the label at the beginning of the basic block |
3851 | 1251 MacroAssembler(cb).bind(blk_labels[b->_pre_order]); |
0 | 1252 |
1253 uint last_inst = b->_nodes.size(); | |
1254 | |
1255 // Emit block normally, except for last instruction. | |
1256 // Emit means "dump code bits into code buffer". | |
3851 | 1257 for (uint j = 0; j<last_inst; j++) { |
0 | 1258 |
1259 // Get the node | |
1260 Node* n = b->_nodes[j]; | |
1261 | |
1262 // See if delay slots are supported | |
1263 if (valid_bundle_info(n) && | |
1264 node_bundling(n)->used_in_unconditional_delay()) { | |
1265 assert(delay_slot == NULL, "no use of delay slot node"); | |
1266 assert(n->size(_regalloc) == Pipeline::instr_unit_size(), "delay slot instruction wrong size"); | |
1267 | |
1268 delay_slot = n; | |
1269 continue; | |
1270 } | |
1271 | |
1272 // If this starts a new instruction group, then flush the current one | |
1273 // (but allow split bundles) | |
3851 | 1274 if (Pipeline::requires_bundling() && starts_bundle(n)) |
0 | 1275 cb->flush_bundle(false); |
1276 | |
1277 // The following logic is duplicated in the code ifdeffed for | |
605 | 1278 // ENABLE_ZAP_DEAD_LOCALS which appears above in this file. It |
0 | 1279 // should be factored out. Or maybe dispersed to the nodes? |
1280 | |
1281 // Special handling for SafePoint/Call Nodes | |
1282 bool is_mcall = false; | |
3851 | 1283 if (n->is_Mach()) { |
0 | 1284 MachNode *mach = n->as_Mach(); |
1285 is_mcall = n->is_MachCall(); | |
1286 bool is_sfn = n->is_MachSafePoint(); | |
1287 | |
1288 // If this requires all previous instructions be flushed, then do so | |
3851 | 1289 if (is_sfn || is_mcall || mach->alignment_required() != 1) { |
0 | 1290 cb->flush_bundle(true); |
1748 | 1291 current_offset = cb->insts_size(); |
0 | 1292 } |
1293 | |
3851 | 1294 // A padding may be needed again since a previous instruction |
1295 // could be moved to delay slot. | |
1296 | |
0 | 1297 // align the instruction if necessary |
1298 int padding = mach->compute_padding(current_offset); | |
1299 // Make sure safepoint node for polling is distinct from a call's | |
1300 // return by adding a nop if needed. | |
3851 | 1301 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) { |
0 | 1302 padding = nop_size; |
1303 } | |
3851 | 1304 if (padding == 0 && mach->avoid_back_to_back() && |
1305 current_offset == last_avoid_back_to_back_offset) { | |
1306 // Avoid back to back some instructions. | |
1307 padding = nop_size; | |
0 | 1308 } |
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1309 |
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1310 if(padding > 0) { |
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1311 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); |
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1312 int nops_cnt = padding / nop_size; |
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1313 MachNode *nop = new (this) MachNopNode(nops_cnt); |
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1314 b->_nodes.insert(j++, nop); |
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1315 last_inst++; |
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1316 _cfg->_bbs.map( nop->_idx, b ); |
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1317 nop->emit(*cb, _regalloc); |
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1318 cb->flush_bundle(true); |
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1319 current_offset = cb->insts_size(); |
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1320 } |
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1321 |
0 | 1322 // Remember the start of the last call in a basic block |
1323 if (is_mcall) { | |
1324 MachCallNode *mcall = mach->as_MachCall(); | |
1325 | |
1326 // This destination address is NOT PC-relative | |
1327 mcall->method_set((intptr_t)mcall->entry_point()); | |
1328 | |
1329 // Save the return address | |
1330 call_returns[b->_pre_order] = current_offset + mcall->ret_addr_offset(); | |
1331 | |
3842 | 1332 if (mcall->is_MachCallLeaf()) { |
0 | 1333 is_mcall = false; |
1334 is_sfn = false; | |
1335 } | |
1336 } | |
1337 | |
1338 // sfn will be valid whenever mcall is valid now because of inheritance | |
3851 | 1339 if (is_sfn || is_mcall) { |
0 | 1340 |
1341 // Handle special safepoint nodes for synchronization | |
3851 | 1342 if (!is_mcall) { |
0 | 1343 MachSafePointNode *sfn = mach->as_MachSafePoint(); |
1344 // !!!!! Stubs only need an oopmap right now, so bail out | |
3851 | 1345 if (sfn->jvms()->method() == NULL) { |
0 | 1346 // Write the oopmap directly to the code blob??!! |
1347 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
1348 assert( !is_node_getting_a_safepoint(sfn), "logic does not match; false positive"); | |
1349 # endif | |
1350 continue; | |
1351 } | |
1352 } // End synchronization | |
1353 | |
1354 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
1355 current_offset); | |
1356 Process_OopMap_Node(mach, current_offset); | |
1357 } // End if safepoint | |
1358 | |
1359 // If this is a null check, then add the start of the previous instruction to the list | |
1360 else if( mach->is_MachNullCheck() ) { | |
1361 inct_starts[inct_cnt++] = previous_offset; | |
1362 } | |
1363 | |
1364 // If this is a branch, then fill in the label with the target BB's label | |
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1365 else if (mach->is_MachBranch()) { |
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1366 // This requires the TRUE branch target be in succs[0] |
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1367 uint block_num = b->non_connector_successor(0)->_pre_order; |
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1368 |
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1369 // Try to replace long branch if delay slot is not used, |
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1370 // it is mostly for back branches since forward branch's |
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1371 // distance is not updated yet. |
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1372 bool delay_slot_is_used = valid_bundle_info(n) && |
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1373 node_bundling(n)->use_unconditional_delay(); |
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1374 if (!delay_slot_is_used && mach->may_be_short_branch()) { |
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1375 assert(delay_slot == NULL, "not expecting delay slot node"); |
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1376 int br_size = n->size(_regalloc); |
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1377 int offset = blk_starts[block_num] - current_offset; |
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1378 if (block_num >= i) { |
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1379 // Current and following block's offset are not |
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1380 // finilized yet, adjust distance by the difference |
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1381 // between calculated and final offsets of current block. |
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1382 offset -= (blk_starts[i] - blk_offset); |
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1383 } |
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1384 // In the following code a nop could be inserted before |
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1385 // the branch which will increase the backward distance. |
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1386 bool needs_padding = (current_offset == last_avoid_back_to_back_offset); |
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1387 if (needs_padding && offset <= 0) |
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1388 offset -= nop_size; |
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1389 |
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1390 if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) { |
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1391 // We've got a winner. Replace this branch. |
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1392 MachNode* replacement = mach->as_MachBranch()->short_branch_version(this); |
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1393 |
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1394 // Update the jmp_size. |
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1395 int new_size = replacement->size(_regalloc); |
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1396 assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller"); |
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1397 // Insert padding between avoid_back_to_back branches. |
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1398 if (needs_padding && replacement->avoid_back_to_back()) { |
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1399 MachNode *nop = new (this) MachNopNode(); |
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1400 b->_nodes.insert(j++, nop); |
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1401 _cfg->_bbs.map(nop->_idx, b); |
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1402 last_inst++; |
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1403 nop->emit(*cb, _regalloc); |
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1404 cb->flush_bundle(true); |
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1405 current_offset = cb->insts_size(); |
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1406 } |
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1407 #ifdef ASSERT |
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1408 jmp_target[i] = block_num; |
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1409 jmp_offset[i] = current_offset - blk_offset; |
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1410 jmp_size[i] = new_size; |
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1411 jmp_rule[i] = mach->rule(); |
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1412 #endif |
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1413 b->_nodes.map(j, replacement); |
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1414 mach->subsume_by(replacement, C); |
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1415 n = replacement; |
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1416 mach = replacement; |
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1417 } |
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1418 } |
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1419 mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num ); |
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1420 } else if (mach->ideal_Opcode() == Op_Jump) { |
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1421 for (uint h = 0; h < b->_num_succs; h++) { |
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1422 Block* succs_block = b->_succs[h]; |
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1423 for (uint j = 1; j < succs_block->num_preds(); j++) { |
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1424 Node* jpn = succs_block->pred(j); |
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1425 if (jpn->is_JumpProj() && jpn->in(0) == mach) { |
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1426 uint block_num = succs_block->non_connector()->_pre_order; |
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1427 Label *blkLabel = &blk_labels[block_num]; |
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1428 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel); |
0 | 1429 } |
1430 } | |
1431 } | |
1432 } | |
1433 | |
1434 #ifdef ASSERT | |
605 | 1435 // Check that oop-store precedes the card-mark |
3851 | 1436 else if (mach->ideal_Opcode() == Op_StoreCM) { |
0 | 1437 uint storeCM_idx = j; |
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1438 int count = 0; |
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1439 for (uint prec = mach->req(); prec < mach->len(); prec++) { |
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1440 Node *oop_store = mach->in(prec); // Precedence edge |
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1441 if (oop_store == NULL) continue; |
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1442 count++; |
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1443 uint i4; |
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1444 for( i4 = 0; i4 < last_inst; ++i4 ) { |
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1445 if( b->_nodes[i4] == oop_store ) break; |
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1446 } |
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1447 // Note: This test can provide a false failure if other precedence |
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1448 // edges have been added to the storeCMNode. |
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1449 assert( i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store"); |
0 | 1450 } |
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1451 assert(count > 0, "storeCM expects at least one precedence edge"); |
0 | 1452 } |
1453 #endif | |
1454 | |
3851 | 1455 else if (!n->is_Proj()) { |
605 | 1456 // Remember the beginning of the previous instruction, in case |
0 | 1457 // it's followed by a flag-kill and a null-check. Happens on |
1458 // Intel all the time, with add-to-memory kind of opcodes. | |
1459 previous_offset = current_offset; | |
1460 } | |
1461 } | |
1462 | |
1463 // Verify that there is sufficient space remaining | |
1464 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size); | |
1202 | 1465 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
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1466 C->record_failure("CodeCache is full"); |
0 | 1467 return; |
1468 } | |
1469 | |
1470 // Save the offset for the listing | |
1471 #ifndef PRODUCT | |
3851 | 1472 if (node_offsets && n->_idx < node_offset_limit) |
1748 | 1473 node_offsets[n->_idx] = cb->insts_size(); |
0 | 1474 #endif |
1475 | |
1476 // "Normal" instruction case | |
3851 | 1477 DEBUG_ONLY( uint instr_offset = cb->insts_size(); ) |
0 | 1478 n->emit(*cb, _regalloc); |
1748 | 1479 current_offset = cb->insts_size(); |
3851 | 1480 |
1481 #ifdef ASSERT | |
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1482 if (n->size(_regalloc) < (current_offset-instr_offset)) { |
3851 | 1483 n->dump(); |
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1484 assert(false, "wrong size of mach node"); |
3851 | 1485 } |
1486 #endif | |
0 | 1487 non_safepoints.observe_instruction(n, current_offset); |
1488 | |
1489 // mcall is last "call" that can be a safepoint | |
1490 // record it so we can see if a poll will directly follow it | |
1491 // in which case we'll need a pad to make the PcDesc sites unique | |
1492 // see 5010568. This can be slightly inaccurate but conservative | |
1493 // in the case that return address is not actually at current_offset. | |
1494 // This is a small price to pay. | |
1495 | |
1496 if (is_mcall) { | |
1497 last_call_offset = current_offset; | |
1498 } | |
1499 | |
3851 | 1500 if (n->is_Mach() && n->as_Mach()->avoid_back_to_back()) { |
1501 // Avoid back to back some instructions. | |
1502 last_avoid_back_to_back_offset = current_offset; | |
1503 } | |
1504 | |
0 | 1505 // See if this instruction has a delay slot |
3851 | 1506 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { |
0 | 1507 assert(delay_slot != NULL, "expecting delay slot node"); |
1508 | |
1509 // Back up 1 instruction | |
1748 | 1510 cb->set_insts_end(cb->insts_end() - Pipeline::instr_unit_size()); |
0 | 1511 |
1512 // Save the offset for the listing | |
1513 #ifndef PRODUCT | |
3851 | 1514 if (node_offsets && delay_slot->_idx < node_offset_limit) |
1748 | 1515 node_offsets[delay_slot->_idx] = cb->insts_size(); |
0 | 1516 #endif |
1517 | |
1518 // Support a SafePoint in the delay slot | |
3851 | 1519 if (delay_slot->is_MachSafePoint()) { |
0 | 1520 MachNode *mach = delay_slot->as_Mach(); |
1521 // !!!!! Stubs only need an oopmap right now, so bail out | |
3851 | 1522 if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL) { |
0 | 1523 // Write the oopmap directly to the code blob??!! |
1524 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
1525 assert( !is_node_getting_a_safepoint(mach), "logic does not match; false positive"); | |
1526 # endif | |
1527 delay_slot = NULL; | |
1528 continue; | |
1529 } | |
1530 | |
1531 int adjusted_offset = current_offset - Pipeline::instr_unit_size(); | |
1532 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
1533 adjusted_offset); | |
1534 // Generate an OopMap entry | |
1535 Process_OopMap_Node(mach, adjusted_offset); | |
1536 } | |
1537 | |
1538 // Insert the delay slot instruction | |
1539 delay_slot->emit(*cb, _regalloc); | |
1540 | |
1541 // Don't reuse it | |
1542 delay_slot = NULL; | |
1543 } | |
1544 | |
1545 } // End for all instructions in block | |
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1546 |
418 | 1547 // If the next block is the top of a loop, pad this block out to align |
1548 // the loop top a little. Helps prevent pipe stalls at loop back branches. | |
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1549 if (i < nblocks-1) { |
0 | 1550 Block *nb = _cfg->_blocks[i+1]; |
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1551 int padding = nb->alignment_padding(current_offset); |
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1552 if( padding > 0 ) { |
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1553 MachNode *nop = new (this) MachNopNode(padding / nop_size); |
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1554 b->_nodes.insert( b->_nodes.size(), nop ); |
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1555 _cfg->_bbs.map( nop->_idx, b ); |
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1556 nop->emit(*cb, _regalloc); |
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1557 current_offset = cb->insts_size(); |
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1558 } |
0 | 1559 } |
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1560 // Verify that the distance for generated before forward |
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1561 // short branches is still valid. |
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1562 guarantee((int)(blk_starts[i+1] - blk_starts[i]) >= (current_offset - blk_offset), "shouldn't increase block size"); |
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1563 |
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1564 // Save new block start offset |
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1565 blk_starts[i] = blk_offset; |
0 | 1566 } // End of for all blocks |
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1567 blk_starts[nblocks] = current_offset; |
0 | 1568 |
1569 non_safepoints.flush_at_end(); | |
1570 | |
1571 // Offset too large? | |
1572 if (failing()) return; | |
1573 | |
1574 // Define a pseudo-label at the end of the code | |
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1575 MacroAssembler(cb).bind( blk_labels[nblocks] ); |
0 | 1576 |
1577 // Compute the size of the first block | |
1578 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos(); | |
1579 | |
1748 | 1580 assert(cb->insts_size() < 500000, "method is unreasonably large"); |
0 | 1581 |
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1582 #ifdef ASSERT |
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1583 for (uint i = 0; i < nblocks; i++) { // For all blocks |
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1584 if (jmp_target[i] != 0) { |
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1585 int br_size = jmp_size[i]; |
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1586 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]); |
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1587 if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) { |
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1588 tty->print_cr("target (%d) - jmp_offset(%d) = offset (%d), jump_size(%d), jmp_block B%d, target_block B%d", blk_starts[jmp_target[i]], blk_starts[i] + jmp_offset[i], offset, br_size, i, jmp_target[i]); |
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1589 assert(false, "Displacement too large for short jmp"); |
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1590 } |
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1591 } |
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1592 } |
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1593 #endif |
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1594 |
0 | 1595 // ------------------ |
1596 | |
1597 #ifndef PRODUCT | |
1598 // Information on the size of the method, without the extraneous code | |
1748 | 1599 Scheduling::increment_method_size(cb->insts_size()); |
0 | 1600 #endif |
1601 | |
1602 // ------------------ | |
1603 // Fill in exception table entries. | |
1604 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels); | |
1605 | |
1606 // Only java methods have exception handlers and deopt handlers | |
1607 if (_method) { | |
1608 // Emit the exception handler code. | |
1609 _code_offsets.set_value(CodeOffsets::Exceptions, emit_exception_handler(*cb)); | |
1610 // Emit the deopt handler code. | |
1611 _code_offsets.set_value(CodeOffsets::Deopt, emit_deopt_handler(*cb)); | |
1265 | 1612 |
1613 // Emit the MethodHandle deopt handler code (if required). | |
1614 if (has_method_handle_invokes()) { | |
1615 // We can use the same code as for the normal deopt handler, we | |
1616 // just need a different entry point address. | |
1617 _code_offsets.set_value(CodeOffsets::DeoptMH, emit_deopt_handler(*cb)); | |
1618 } | |
0 | 1619 } |
1620 | |
1621 // One last check for failed CodeBuffer::expand: | |
1202 | 1622 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
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1623 C->record_failure("CodeCache is full"); |
0 | 1624 return; |
1625 } | |
1626 | |
1627 #ifndef PRODUCT | |
1628 // Dump the assembly code, including basic-block numbers | |
1629 if (print_assembly()) { | |
1630 ttyLocker ttyl; // keep the following output all in one block | |
1631 if (!VMThread::should_terminate()) { // test this under the tty lock | |
1632 // This output goes directly to the tty, not the compiler log. | |
1633 // To enable tools to match it up with the compilation activity, | |
1634 // be sure to tag this tty output with the compile ID. | |
1635 if (xtty != NULL) { | |
1636 xtty->head("opto_assembly compile_id='%d'%s", compile_id(), | |
1637 is_osr_compilation() ? " compile_kind='osr'" : | |
1638 ""); | |
1639 } | |
1640 if (method() != NULL) { | |
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1641 method()->print_metadata(); |
0 | 1642 } |
1643 dump_asm(node_offsets, node_offset_limit); | |
1644 if (xtty != NULL) { | |
1645 xtty->tail("opto_assembly"); | |
1646 } | |
1647 } | |
1648 } | |
1649 #endif | |
1650 | |
1651 } | |
1652 | |
1653 void Compile::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) { | |
1654 _inc_table.set_size(cnt); | |
1655 | |
1656 uint inct_cnt = 0; | |
1657 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
1658 Block *b = _cfg->_blocks[i]; | |
1659 Node *n = NULL; | |
1660 int j; | |
1661 | |
1662 // Find the branch; ignore trailing NOPs. | |
1663 for( j = b->_nodes.size()-1; j>=0; j-- ) { | |
1664 n = b->_nodes[j]; | |
1665 if( !n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con ) | |
1666 break; | |
1667 } | |
1668 | |
1669 // If we didn't find anything, continue | |
1670 if( j < 0 ) continue; | |
1671 | |
1672 // Compute ExceptionHandlerTable subtable entry and add it | |
1673 // (skip empty blocks) | |
1674 if( n->is_Catch() ) { | |
1675 | |
1676 // Get the offset of the return from the call | |
1677 uint call_return = call_returns[b->_pre_order]; | |
1678 #ifdef ASSERT | |
1679 assert( call_return > 0, "no call seen for this basic block" ); | |
3842 | 1680 while( b->_nodes[--j]->is_MachProj() ) ; |
1681 assert( b->_nodes[j]->is_MachCall(), "CatchProj must follow call" ); | |
0 | 1682 #endif |
1683 // last instruction is a CatchNode, find it's CatchProjNodes | |
1684 int nof_succs = b->_num_succs; | |
1685 // allocate space | |
1686 GrowableArray<intptr_t> handler_bcis(nof_succs); | |
1687 GrowableArray<intptr_t> handler_pcos(nof_succs); | |
1688 // iterate through all successors | |
1689 for (int j = 0; j < nof_succs; j++) { | |
1690 Block* s = b->_succs[j]; | |
1691 bool found_p = false; | |
1692 for( uint k = 1; k < s->num_preds(); k++ ) { | |
1693 Node *pk = s->pred(k); | |
1694 if( pk->is_CatchProj() && pk->in(0) == n ) { | |
1695 const CatchProjNode* p = pk->as_CatchProj(); | |
1696 found_p = true; | |
1697 // add the corresponding handler bci & pco information | |
1698 if( p->_con != CatchProjNode::fall_through_index ) { | |
1699 // p leads to an exception handler (and is not fall through) | |
1700 assert(s == _cfg->_blocks[s->_pre_order],"bad numbering"); | |
1701 // no duplicates, please | |
1702 if( !handler_bcis.contains(p->handler_bci()) ) { | |
1703 uint block_num = s->non_connector()->_pre_order; | |
1704 handler_bcis.append(p->handler_bci()); | |
1705 handler_pcos.append(blk_labels[block_num].loc_pos()); | |
1706 } | |
1707 } | |
1708 } | |
1709 } | |
1710 assert(found_p, "no matching predecessor found"); | |
1711 // Note: Due to empty block removal, one block may have | |
1712 // several CatchProj inputs, from the same Catch. | |
1713 } | |
1714 | |
1715 // Set the offset of the return from the call | |
1716 _handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos); | |
1717 continue; | |
1718 } | |
1719 | |
1720 // Handle implicit null exception table updates | |
1721 if( n->is_MachNullCheck() ) { | |
1722 uint block_num = b->non_connector_successor(0)->_pre_order; | |
1723 _inc_table.append( inct_starts[inct_cnt++], blk_labels[block_num].loc_pos() ); | |
1724 continue; | |
1725 } | |
1726 } // End of for all blocks fill in exception table entries | |
1727 } | |
1728 | |
1729 // Static Variables | |
1730 #ifndef PRODUCT | |
1731 uint Scheduling::_total_nop_size = 0; | |
1732 uint Scheduling::_total_method_size = 0; | |
1733 uint Scheduling::_total_branches = 0; | |
1734 uint Scheduling::_total_unconditional_delays = 0; | |
1735 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1]; | |
1736 #endif | |
1737 | |
1738 // Initializer for class Scheduling | |
1739 | |
1740 Scheduling::Scheduling(Arena *arena, Compile &compile) | |
1741 : _arena(arena), | |
1742 _cfg(compile.cfg()), | |
1743 _bbs(compile.cfg()->_bbs), | |
1744 _regalloc(compile.regalloc()), | |
1745 _reg_node(arena), | |
1746 _bundle_instr_count(0), | |
1747 _bundle_cycle_number(0), | |
1748 _scheduled(arena), | |
1749 _available(arena), | |
1750 _next_node(NULL), | |
1751 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0]), | |
1752 _pinch_free_list(arena) | |
1753 #ifndef PRODUCT | |
1754 , _branches(0) | |
1755 , _unconditional_delays(0) | |
1756 #endif | |
1757 { | |
1758 // Create a MachNopNode | |
1759 _nop = new (&compile) MachNopNode(); | |
1760 | |
1761 // Now that the nops are in the array, save the count | |
1762 // (but allow entries for the nops) | |
1763 _node_bundling_limit = compile.unique(); | |
1764 uint node_max = _regalloc->node_regs_max_index(); | |
1765 | |
1766 compile.set_node_bundling_limit(_node_bundling_limit); | |
1767 | |
605 | 1768 // This one is persistent within the Compile class |
0 | 1769 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max); |
1770 | |
1771 // Allocate space for fixed-size arrays | |
1772 _node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
1773 _uses = NEW_ARENA_ARRAY(arena, short, node_max); | |
1774 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
1775 | |
1776 // Clear the arrays | |
1777 memset(_node_bundling_base, 0, node_max * sizeof(Bundle)); | |
1778 memset(_node_latency, 0, node_max * sizeof(unsigned short)); | |
1779 memset(_uses, 0, node_max * sizeof(short)); | |
1780 memset(_current_latency, 0, node_max * sizeof(unsigned short)); | |
1781 | |
1782 // Clear the bundling information | |
1783 memcpy(_bundle_use_elements, | |
1784 Pipeline_Use::elaborated_elements, | |
1785 sizeof(Pipeline_Use::elaborated_elements)); | |
1786 | |
1787 // Get the last node | |
1788 Block *bb = _cfg->_blocks[_cfg->_blocks.size()-1]; | |
1789 | |
1790 _next_node = bb->_nodes[bb->_nodes.size()-1]; | |
1791 } | |
1792 | |
1793 #ifndef PRODUCT | |
1794 // Scheduling destructor | |
1795 Scheduling::~Scheduling() { | |
1796 _total_branches += _branches; | |
1797 _total_unconditional_delays += _unconditional_delays; | |
1798 } | |
1799 #endif | |
1800 | |
1801 // Step ahead "i" cycles | |
1802 void Scheduling::step(uint i) { | |
1803 | |
1804 Bundle *bundle = node_bundling(_next_node); | |
1805 bundle->set_starts_bundle(); | |
1806 | |
1807 // Update the bundle record, but leave the flags information alone | |
1808 if (_bundle_instr_count > 0) { | |
1809 bundle->set_instr_count(_bundle_instr_count); | |
1810 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
1811 } | |
1812 | |
1813 // Update the state information | |
1814 _bundle_instr_count = 0; | |
1815 _bundle_cycle_number += i; | |
1816 _bundle_use.step(i); | |
1817 } | |
1818 | |
1819 void Scheduling::step_and_clear() { | |
1820 Bundle *bundle = node_bundling(_next_node); | |
1821 bundle->set_starts_bundle(); | |
1822 | |
1823 // Update the bundle record | |
1824 if (_bundle_instr_count > 0) { | |
1825 bundle->set_instr_count(_bundle_instr_count); | |
1826 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
1827 | |
1828 _bundle_cycle_number += 1; | |
1829 } | |
1830 | |
1831 // Clear the bundling information | |
1832 _bundle_instr_count = 0; | |
1833 _bundle_use.reset(); | |
1834 | |
1835 memcpy(_bundle_use_elements, | |
1836 Pipeline_Use::elaborated_elements, | |
1837 sizeof(Pipeline_Use::elaborated_elements)); | |
1838 } | |
1839 | |
1840 //------------------------------ScheduleAndBundle------------------------------ | |
1841 // Perform instruction scheduling and bundling over the sequence of | |
1842 // instructions in backwards order. | |
1843 void Compile::ScheduleAndBundle() { | |
1844 | |
1845 // Don't optimize this if it isn't a method | |
1846 if (!_method) | |
1847 return; | |
1848 | |
1849 // Don't optimize this if scheduling is disabled | |
1850 if (!do_scheduling()) | |
1851 return; | |
1852 | |
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1853 // Scheduling code works only with pairs (8 bytes) maximum. |
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1854 if (max_vector_size() > 8) |
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1855 return; |
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1856 |
0 | 1857 NOT_PRODUCT( TracePhase t2("isched", &_t_instrSched, TimeCompiler); ) |
1858 | |
1859 // Create a data structure for all the scheduling information | |
1860 Scheduling scheduling(Thread::current()->resource_area(), *this); | |
1861 | |
1862 // Walk backwards over each basic block, computing the needed alignment | |
1863 // Walk over all the basic blocks | |
1864 scheduling.DoScheduling(); | |
1865 } | |
1866 | |
1867 //------------------------------ComputeLocalLatenciesForward------------------- | |
1868 // Compute the latency of all the instructions. This is fairly simple, | |
1869 // because we already have a legal ordering. Walk over the instructions | |
1870 // from first to last, and compute the latency of the instruction based | |
605 | 1871 // on the latency of the preceding instruction(s). |
0 | 1872 void Scheduling::ComputeLocalLatenciesForward(const Block *bb) { |
1873 #ifndef PRODUCT | |
1874 if (_cfg->C->trace_opto_output()) | |
1875 tty->print("# -> ComputeLocalLatenciesForward\n"); | |
1876 #endif | |
1877 | |
1878 // Walk over all the schedulable instructions | |
1879 for( uint j=_bb_start; j < _bb_end; j++ ) { | |
1880 | |
1881 // This is a kludge, forcing all latency calculations to start at 1. | |
1882 // Used to allow latency 0 to force an instruction to the beginning | |
1883 // of the bb | |
1884 uint latency = 1; | |
1885 Node *use = bb->_nodes[j]; | |
1886 uint nlen = use->len(); | |
1887 | |
1888 // Walk over all the inputs | |
1889 for ( uint k=0; k < nlen; k++ ) { | |
1890 Node *def = use->in(k); | |
1891 if (!def) | |
1892 continue; | |
1893 | |
1894 uint l = _node_latency[def->_idx] + use->latency(k); | |
1895 if (latency < l) | |
1896 latency = l; | |
1897 } | |
1898 | |
1899 _node_latency[use->_idx] = latency; | |
1900 | |
1901 #ifndef PRODUCT | |
1902 if (_cfg->C->trace_opto_output()) { | |
1903 tty->print("# latency %4d: ", latency); | |
1904 use->dump(); | |
1905 } | |
1906 #endif | |
1907 } | |
1908 | |
1909 #ifndef PRODUCT | |
1910 if (_cfg->C->trace_opto_output()) | |
1911 tty->print("# <- ComputeLocalLatenciesForward\n"); | |
1912 #endif | |
1913 | |
1914 } // end ComputeLocalLatenciesForward | |
1915 | |
1916 // See if this node fits into the present instruction bundle | |
1917 bool Scheduling::NodeFitsInBundle(Node *n) { | |
1918 uint n_idx = n->_idx; | |
1919 | |
1920 // If this is the unconditional delay instruction, then it fits | |
1921 if (n == _unconditional_delay_slot) { | |
1922 #ifndef PRODUCT | |
1923 if (_cfg->C->trace_opto_output()) | |
1924 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx); | |
1925 #endif | |
1926 return (true); | |
1927 } | |
1928 | |
1929 // If the node cannot be scheduled this cycle, skip it | |
1930 if (_current_latency[n_idx] > _bundle_cycle_number) { | |
1931 #ifndef PRODUCT | |
1932 if (_cfg->C->trace_opto_output()) | |
1933 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n", | |
1934 n->_idx, _current_latency[n_idx], _bundle_cycle_number); | |
1935 #endif | |
1936 return (false); | |
1937 } | |
1938 | |
1939 const Pipeline *node_pipeline = n->pipeline(); | |
1940 | |
1941 uint instruction_count = node_pipeline->instructionCount(); | |
1942 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
1943 instruction_count = 0; | |
1944 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
1945 instruction_count++; | |
1946 | |
1947 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) { | |
1948 #ifndef PRODUCT | |
1949 if (_cfg->C->trace_opto_output()) | |
1950 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n", | |
1951 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle); | |
1952 #endif | |
1953 return (false); | |
1954 } | |
1955 | |
1956 // Don't allow non-machine nodes to be handled this way | |
1957 if (!n->is_Mach() && instruction_count == 0) | |
1958 return (false); | |
1959 | |
1960 // See if there is any overlap | |
1961 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse()); | |
1962 | |
1963 if (delay > 0) { | |
1964 #ifndef PRODUCT | |
1965 if (_cfg->C->trace_opto_output()) | |
1966 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx); | |
1967 #endif | |
1968 return false; | |
1969 } | |
1970 | |
1971 #ifndef PRODUCT | |
1972 if (_cfg->C->trace_opto_output()) | |
1973 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx); | |
1974 #endif | |
1975 | |
1976 return true; | |
1977 } | |
1978 | |
1979 Node * Scheduling::ChooseNodeToBundle() { | |
1980 uint siz = _available.size(); | |
1981 | |
1982 if (siz == 0) { | |
1983 | |
1984 #ifndef PRODUCT | |
1985 if (_cfg->C->trace_opto_output()) | |
1986 tty->print("# ChooseNodeToBundle: NULL\n"); | |
1987 #endif | |
1988 return (NULL); | |
1989 } | |
1990 | |
1991 // Fast path, if only 1 instruction in the bundle | |
1992 if (siz == 1) { | |
1993 #ifndef PRODUCT | |
1994 if (_cfg->C->trace_opto_output()) { | |
1995 tty->print("# ChooseNodeToBundle (only 1): "); | |
1996 _available[0]->dump(); | |
1997 } | |
1998 #endif | |
1999 return (_available[0]); | |
2000 } | |
2001 | |
2002 // Don't bother, if the bundle is already full | |
2003 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) { | |
2004 for ( uint i = 0; i < siz; i++ ) { | |
2005 Node *n = _available[i]; | |
2006 | |
2007 // Skip projections, we'll handle them another way | |
2008 if (n->is_Proj()) | |
2009 continue; | |
2010 | |
2011 // This presupposed that instructions are inserted into the | |
2012 // available list in a legality order; i.e. instructions that | |
2013 // must be inserted first are at the head of the list | |
2014 if (NodeFitsInBundle(n)) { | |
2015 #ifndef PRODUCT | |
2016 if (_cfg->C->trace_opto_output()) { | |
2017 tty->print("# ChooseNodeToBundle: "); | |
2018 n->dump(); | |
2019 } | |
2020 #endif | |
2021 return (n); | |
2022 } | |
2023 } | |
2024 } | |
2025 | |
2026 // Nothing fits in this bundle, choose the highest priority | |
2027 #ifndef PRODUCT | |
2028 if (_cfg->C->trace_opto_output()) { | |
2029 tty->print("# ChooseNodeToBundle: "); | |
2030 _available[0]->dump(); | |
2031 } | |
2032 #endif | |
2033 | |
2034 return _available[0]; | |
2035 } | |
2036 | |
2037 //------------------------------AddNodeToAvailableList------------------------- | |
2038 void Scheduling::AddNodeToAvailableList(Node *n) { | |
2039 assert( !n->is_Proj(), "projections never directly made available" ); | |
2040 #ifndef PRODUCT | |
2041 if (_cfg->C->trace_opto_output()) { | |
2042 tty->print("# AddNodeToAvailableList: "); | |
2043 n->dump(); | |
2044 } | |
2045 #endif | |
2046 | |
2047 int latency = _current_latency[n->_idx]; | |
2048 | |
2049 // Insert in latency order (insertion sort) | |
2050 uint i; | |
2051 for ( i=0; i < _available.size(); i++ ) | |
2052 if (_current_latency[_available[i]->_idx] > latency) | |
2053 break; | |
2054 | |
2055 // Special Check for compares following branches | |
2056 if( n->is_Mach() && _scheduled.size() > 0 ) { | |
2057 int op = n->as_Mach()->ideal_Opcode(); | |
2058 Node *last = _scheduled[0]; | |
2059 if( last->is_MachIf() && last->in(1) == n && | |
2060 ( op == Op_CmpI || | |
2061 op == Op_CmpU || | |
2062 op == Op_CmpP || | |
2063 op == Op_CmpF || | |
2064 op == Op_CmpD || | |
2065 op == Op_CmpL ) ) { | |
2066 | |
2067 // Recalculate position, moving to front of same latency | |
2068 for ( i=0 ; i < _available.size(); i++ ) | |
2069 if (_current_latency[_available[i]->_idx] >= latency) | |
2070 break; | |
2071 } | |
2072 } | |
2073 | |
2074 // Insert the node in the available list | |
2075 _available.insert(i, n); | |
2076 | |
2077 #ifndef PRODUCT | |
2078 if (_cfg->C->trace_opto_output()) | |
2079 dump_available(); | |
2080 #endif | |
2081 } | |
2082 | |
2083 //------------------------------DecrementUseCounts----------------------------- | |
2084 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) { | |
2085 for ( uint i=0; i < n->len(); i++ ) { | |
2086 Node *def = n->in(i); | |
2087 if (!def) continue; | |
2088 if( def->is_Proj() ) // If this is a machine projection, then | |
2089 def = def->in(0); // propagate usage thru to the base instruction | |
2090 | |
2091 if( _bbs[def->_idx] != bb ) // Ignore if not block-local | |
2092 continue; | |
2093 | |
2094 // Compute the latency | |
2095 uint l = _bundle_cycle_number + n->latency(i); | |
2096 if (_current_latency[def->_idx] < l) | |
2097 _current_latency[def->_idx] = l; | |
2098 | |
2099 // If this does not have uses then schedule it | |
2100 if ((--_uses[def->_idx]) == 0) | |
2101 AddNodeToAvailableList(def); | |
2102 } | |
2103 } | |
2104 | |
2105 //------------------------------AddNodeToBundle-------------------------------- | |
2106 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) { | |
2107 #ifndef PRODUCT | |
2108 if (_cfg->C->trace_opto_output()) { | |
2109 tty->print("# AddNodeToBundle: "); | |
2110 n->dump(); | |
2111 } | |
2112 #endif | |
2113 | |
2114 // Remove this from the available list | |
2115 uint i; | |
2116 for (i = 0; i < _available.size(); i++) | |
2117 if (_available[i] == n) | |
2118 break; | |
2119 assert(i < _available.size(), "entry in _available list not found"); | |
2120 _available.remove(i); | |
2121 | |
2122 // See if this fits in the current bundle | |
2123 const Pipeline *node_pipeline = n->pipeline(); | |
2124 const Pipeline_Use& node_usage = node_pipeline->resourceUse(); | |
2125 | |
2126 // Check for instructions to be placed in the delay slot. We | |
2127 // do this before we actually schedule the current instruction, | |
2128 // because the delay slot follows the current instruction. | |
2129 if (Pipeline::_branch_has_delay_slot && | |
2130 node_pipeline->hasBranchDelay() && | |
2131 !_unconditional_delay_slot) { | |
2132 | |
2133 uint siz = _available.size(); | |
2134 | |
2135 // Conditional branches can support an instruction that | |
605 | 2136 // is unconditionally executed and not dependent by the |
0 | 2137 // branch, OR a conditionally executed instruction if |
2138 // the branch is taken. In practice, this means that | |
2139 // the first instruction at the branch target is | |
2140 // copied to the delay slot, and the branch goes to | |
2141 // the instruction after that at the branch target | |
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|
2142 if ( n->is_MachBranch() ) { |
0 | 2143 |
2144 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" ); | |
2145 assert( !n->is_Catch(), "should not look for delay slot for Catch" ); | |
2146 | |
2147 #ifndef PRODUCT | |
2148 _branches++; | |
2149 #endif | |
2150 | |
2151 // At least 1 instruction is on the available list | |
605 | 2152 // that is not dependent on the branch |
0 | 2153 for (uint i = 0; i < siz; i++) { |
2154 Node *d = _available[i]; | |
2155 const Pipeline *avail_pipeline = d->pipeline(); | |
2156 | |
2157 // Don't allow safepoints in the branch shadow, that will | |
2158 // cause a number of difficulties | |
2159 if ( avail_pipeline->instructionCount() == 1 && | |
2160 !avail_pipeline->hasMultipleBundles() && | |
2161 !avail_pipeline->hasBranchDelay() && | |
2162 Pipeline::instr_has_unit_size() && | |
2163 d->size(_regalloc) == Pipeline::instr_unit_size() && | |
2164 NodeFitsInBundle(d) && | |
2165 !node_bundling(d)->used_in_delay()) { | |
2166 | |
2167 if (d->is_Mach() && !d->is_MachSafePoint()) { | |
2168 // A node that fits in the delay slot was found, so we need to | |
2169 // set the appropriate bits in the bundle pipeline information so | |
2170 // that it correctly indicates resource usage. Later, when we | |
2171 // attempt to add this instruction to the bundle, we will skip | |
2172 // setting the resource usage. | |
2173 _unconditional_delay_slot = d; | |
2174 node_bundling(n)->set_use_unconditional_delay(); | |
2175 node_bundling(d)->set_used_in_unconditional_delay(); | |
2176 _bundle_use.add_usage(avail_pipeline->resourceUse()); | |
2177 _current_latency[d->_idx] = _bundle_cycle_number; | |
2178 _next_node = d; | |
2179 ++_bundle_instr_count; | |
2180 #ifndef PRODUCT | |
2181 _unconditional_delays++; | |
2182 #endif | |
2183 break; | |
2184 } | |
2185 } | |
2186 } | |
2187 } | |
2188 | |
2189 // No delay slot, add a nop to the usage | |
2190 if (!_unconditional_delay_slot) { | |
2191 // See if adding an instruction in the delay slot will overflow | |
2192 // the bundle. | |
2193 if (!NodeFitsInBundle(_nop)) { | |
2194 #ifndef PRODUCT | |
2195 if (_cfg->C->trace_opto_output()) | |
2196 tty->print("# *** STEP(1 instruction for delay slot) ***\n"); | |
2197 #endif | |
2198 step(1); | |
2199 } | |
2200 | |
2201 _bundle_use.add_usage(_nop->pipeline()->resourceUse()); | |
2202 _next_node = _nop; | |
2203 ++_bundle_instr_count; | |
2204 } | |
2205 | |
2206 // See if the instruction in the delay slot requires a | |
2207 // step of the bundles | |
2208 if (!NodeFitsInBundle(n)) { | |
2209 #ifndef PRODUCT | |
2210 if (_cfg->C->trace_opto_output()) | |
2211 tty->print("# *** STEP(branch won't fit) ***\n"); | |
2212 #endif | |
2213 // Update the state information | |
2214 _bundle_instr_count = 0; | |
2215 _bundle_cycle_number += 1; | |
2216 _bundle_use.step(1); | |
2217 } | |
2218 } | |
2219 | |
2220 // Get the number of instructions | |
2221 uint instruction_count = node_pipeline->instructionCount(); | |
2222 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
2223 instruction_count = 0; | |
2224 | |
2225 // Compute the latency information | |
2226 uint delay = 0; | |
2227 | |
2228 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) { | |
2229 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number; | |
2230 if (relative_latency < 0) | |
2231 relative_latency = 0; | |
2232 | |
2233 delay = _bundle_use.full_latency(relative_latency, node_usage); | |
2234 | |
2235 // Does not fit in this bundle, start a new one | |
2236 if (delay > 0) { | |
2237 step(delay); | |
2238 | |
2239 #ifndef PRODUCT | |
2240 if (_cfg->C->trace_opto_output()) | |
2241 tty->print("# *** STEP(%d) ***\n", delay); | |
2242 #endif | |
2243 } | |
2244 } | |
2245 | |
2246 // If this was placed in the delay slot, ignore it | |
2247 if (n != _unconditional_delay_slot) { | |
2248 | |
2249 if (delay == 0) { | |
2250 if (node_pipeline->hasMultipleBundles()) { | |
2251 #ifndef PRODUCT | |
2252 if (_cfg->C->trace_opto_output()) | |
2253 tty->print("# *** STEP(multiple instructions) ***\n"); | |
2254 #endif | |
2255 step(1); | |
2256 } | |
2257 | |
2258 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) { | |
2259 #ifndef PRODUCT | |
2260 if (_cfg->C->trace_opto_output()) | |
2261 tty->print("# *** STEP(%d >= %d instructions) ***\n", | |
2262 instruction_count + _bundle_instr_count, | |
2263 Pipeline::_max_instrs_per_cycle); | |
2264 #endif | |
2265 step(1); | |
2266 } | |
2267 } | |
2268 | |
2269 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
2270 _bundle_instr_count++; | |
2271 | |
2272 // Set the node's latency | |
2273 _current_latency[n->_idx] = _bundle_cycle_number; | |
2274 | |
2275 // Now merge the functional unit information | |
2276 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) | |
2277 _bundle_use.add_usage(node_usage); | |
2278 | |
2279 // Increment the number of instructions in this bundle | |
2280 _bundle_instr_count += instruction_count; | |
2281 | |
2282 // Remember this node for later | |
2283 if (n->is_Mach()) | |
2284 _next_node = n; | |
2285 } | |
2286 | |
2287 // It's possible to have a BoxLock in the graph and in the _bbs mapping but | |
2288 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks. | |
2289 // 'Schedule' them (basically ignore in the schedule) but do not insert them | |
2290 // into the block. All other scheduled nodes get put in the schedule here. | |
2291 int op = n->Opcode(); | |
2292 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR | |
2293 (op != Op_Node && // Not an unused antidepedence node and | |
2294 // not an unallocated boxlock | |
2295 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) { | |
2296 | |
2297 // Push any trailing projections | |
2298 if( bb->_nodes[bb->_nodes.size()-1] != n ) { | |
2299 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
2300 Node *foi = n->fast_out(i); | |
2301 if( foi->is_Proj() ) | |
2302 _scheduled.push(foi); | |
2303 } | |
2304 } | |
2305 | |
2306 // Put the instruction in the schedule list | |
2307 _scheduled.push(n); | |
2308 } | |
2309 | |
2310 #ifndef PRODUCT | |
2311 if (_cfg->C->trace_opto_output()) | |
2312 dump_available(); | |
2313 #endif | |
2314 | |
2315 // Walk all the definitions, decrementing use counts, and | |
2316 // if a definition has a 0 use count, place it in the available list. | |
2317 DecrementUseCounts(n,bb); | |
2318 } | |
2319 | |
2320 //------------------------------ComputeUseCount-------------------------------- | |
2321 // This method sets the use count within a basic block. We will ignore all | |
2322 // uses outside the current basic block. As we are doing a backwards walk, | |
2323 // any node we reach that has a use count of 0 may be scheduled. This also | |
2324 // avoids the problem of cyclic references from phi nodes, as long as phi | |
2325 // nodes are at the front of the basic block. This method also initializes | |
2326 // the available list to the set of instructions that have no uses within this | |
2327 // basic block. | |
2328 void Scheduling::ComputeUseCount(const Block *bb) { | |
2329 #ifndef PRODUCT | |
2330 if (_cfg->C->trace_opto_output()) | |
2331 tty->print("# -> ComputeUseCount\n"); | |
2332 #endif | |
2333 | |
2334 // Clear the list of available and scheduled instructions, just in case | |
2335 _available.clear(); | |
2336 _scheduled.clear(); | |
2337 | |
2338 // No delay slot specified | |
2339 _unconditional_delay_slot = NULL; | |
2340 | |
2341 #ifdef ASSERT | |
2342 for( uint i=0; i < bb->_nodes.size(); i++ ) | |
2343 assert( _uses[bb->_nodes[i]->_idx] == 0, "_use array not clean" ); | |
2344 #endif | |
2345 | |
2346 // Force the _uses count to never go to zero for unscheduable pieces | |
2347 // of the block | |
2348 for( uint k = 0; k < _bb_start; k++ ) | |
2349 _uses[bb->_nodes[k]->_idx] = 1; | |
2350 for( uint l = _bb_end; l < bb->_nodes.size(); l++ ) | |
2351 _uses[bb->_nodes[l]->_idx] = 1; | |
2352 | |
2353 // Iterate backwards over the instructions in the block. Don't count the | |
2354 // branch projections at end or the block header instructions. | |
2355 for( uint j = _bb_end-1; j >= _bb_start; j-- ) { | |
2356 Node *n = bb->_nodes[j]; | |
2357 if( n->is_Proj() ) continue; // Projections handled another way | |
2358 | |
2359 // Account for all uses | |
2360 for ( uint k = 0; k < n->len(); k++ ) { | |
2361 Node *inp = n->in(k); | |
2362 if (!inp) continue; | |
2363 assert(inp != n, "no cycles allowed" ); | |
2364 if( _bbs[inp->_idx] == bb ) { // Block-local use? | |
2365 if( inp->is_Proj() ) // Skip through Proj's | |
2366 inp = inp->in(0); | |
2367 ++_uses[inp->_idx]; // Count 1 block-local use | |
2368 } | |
2369 } | |
2370 | |
2371 // If this instruction has a 0 use count, then it is available | |
2372 if (!_uses[n->_idx]) { | |
2373 _current_latency[n->_idx] = _bundle_cycle_number; | |
2374 AddNodeToAvailableList(n); | |
2375 } | |
2376 | |
2377 #ifndef PRODUCT | |
2378 if (_cfg->C->trace_opto_output()) { | |
2379 tty->print("# uses: %3d: ", _uses[n->_idx]); | |
2380 n->dump(); | |
2381 } | |
2382 #endif | |
2383 } | |
2384 | |
2385 #ifndef PRODUCT | |
2386 if (_cfg->C->trace_opto_output()) | |
2387 tty->print("# <- ComputeUseCount\n"); | |
2388 #endif | |
2389 } | |
2390 | |
2391 // This routine performs scheduling on each basic block in reverse order, | |
2392 // using instruction latencies and taking into account function unit | |
2393 // availability. | |
2394 void Scheduling::DoScheduling() { | |
2395 #ifndef PRODUCT | |
2396 if (_cfg->C->trace_opto_output()) | |
2397 tty->print("# -> DoScheduling\n"); | |
2398 #endif | |
2399 | |
2400 Block *succ_bb = NULL; | |
2401 Block *bb; | |
2402 | |
2403 // Walk over all the basic blocks in reverse order | |
2404 for( int i=_cfg->_num_blocks-1; i >= 0; succ_bb = bb, i-- ) { | |
2405 bb = _cfg->_blocks[i]; | |
2406 | |
2407 #ifndef PRODUCT | |
2408 if (_cfg->C->trace_opto_output()) { | |
2409 tty->print("# Schedule BB#%03d (initial)\n", i); | |
2410 for (uint j = 0; j < bb->_nodes.size(); j++) | |
2411 bb->_nodes[j]->dump(); | |
2412 } | |
2413 #endif | |
2414 | |
2415 // On the head node, skip processing | |
2416 if( bb == _cfg->_broot ) | |
2417 continue; | |
2418 | |
2419 // Skip empty, connector blocks | |
2420 if (bb->is_connector()) | |
2421 continue; | |
2422 | |
2423 // If the following block is not the sole successor of | |
2424 // this one, then reset the pipeline information | |
2425 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) { | |
2426 #ifndef PRODUCT | |
2427 if (_cfg->C->trace_opto_output()) { | |
2428 tty->print("*** bundle start of next BB, node %d, for %d instructions\n", | |
2429 _next_node->_idx, _bundle_instr_count); | |
2430 } | |
2431 #endif | |
2432 step_and_clear(); | |
2433 } | |
2434 | |
2435 // Leave untouched the starting instruction, any Phis, a CreateEx node | |
2436 // or Top. bb->_nodes[_bb_start] is the first schedulable instruction. | |
2437 _bb_end = bb->_nodes.size()-1; | |
2438 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) { | |
2439 Node *n = bb->_nodes[_bb_start]; | |
2440 // Things not matched, like Phinodes and ProjNodes don't get scheduled. | |
2441 // Also, MachIdealNodes do not get scheduled | |
2442 if( !n->is_Mach() ) continue; // Skip non-machine nodes | |
2443 MachNode *mach = n->as_Mach(); | |
2444 int iop = mach->ideal_Opcode(); | |
2445 if( iop == Op_CreateEx ) continue; // CreateEx is pinned | |
2446 if( iop == Op_Con ) continue; // Do not schedule Top | |
2447 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes | |
2448 mach->pipeline() == MachNode::pipeline_class() && | |
2449 !n->is_SpillCopy() ) // Breakpoints, Prolog, etc | |
2450 continue; | |
2451 break; // Funny loop structure to be sure... | |
2452 } | |
2453 // Compute last "interesting" instruction in block - last instruction we | |
2454 // might schedule. _bb_end points just after last schedulable inst. We | |
2455 // normally schedule conditional branches (despite them being forced last | |
2456 // in the block), because they have delay slots we can fill. Calls all | |
2457 // have their delay slots filled in the template expansions, so we don't | |
2458 // bother scheduling them. | |
2459 Node *last = bb->_nodes[_bb_end]; | |
3851 | 2460 // Ignore trailing NOPs. |
2461 while (_bb_end > 0 && last->is_Mach() && | |
2462 last->as_Mach()->ideal_Opcode() == Op_Con) { | |
2463 last = bb->_nodes[--_bb_end]; | |
2464 } | |
2465 assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, ""); | |
0 | 2466 if( last->is_Catch() || |
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2467 // Exclude unreachable path case when Halt node is in a separate block. |
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2468 (_bb_end > 1 && last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) { |
0 | 2469 // There must be a prior call. Skip it. |
3842 | 2470 while( !bb->_nodes[--_bb_end]->is_MachCall() ) { |
2471 assert( bb->_nodes[_bb_end]->is_MachProj(), "skipping projections after expected call" ); | |
0 | 2472 } |
2473 } else if( last->is_MachNullCheck() ) { | |
2474 // Backup so the last null-checked memory instruction is | |
2475 // outside the schedulable range. Skip over the nullcheck, | |
2476 // projection, and the memory nodes. | |
2477 Node *mem = last->in(1); | |
2478 do { | |
2479 _bb_end--; | |
2480 } while (mem != bb->_nodes[_bb_end]); | |
2481 } else { | |
2482 // Set _bb_end to point after last schedulable inst. | |
2483 _bb_end++; | |
2484 } | |
2485 | |
2486 assert( _bb_start <= _bb_end, "inverted block ends" ); | |
2487 | |
2488 // Compute the register antidependencies for the basic block | |
2489 ComputeRegisterAntidependencies(bb); | |
2490 if (_cfg->C->failing()) return; // too many D-U pinch points | |
2491 | |
2492 // Compute intra-bb latencies for the nodes | |
2493 ComputeLocalLatenciesForward(bb); | |
2494 | |
2495 // Compute the usage within the block, and set the list of all nodes | |
2496 // in the block that have no uses within the block. | |
2497 ComputeUseCount(bb); | |
2498 | |
2499 // Schedule the remaining instructions in the block | |
2500 while ( _available.size() > 0 ) { | |
2501 Node *n = ChooseNodeToBundle(); | |
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2502 guarantee(n != NULL, "no nodes available"); |
0 | 2503 AddNodeToBundle(n,bb); |
2504 } | |
2505 | |
2506 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" ); | |
2507 #ifdef ASSERT | |
2508 for( uint l = _bb_start; l < _bb_end; l++ ) { | |
2509 Node *n = bb->_nodes[l]; | |
2510 uint m; | |
2511 for( m = 0; m < _bb_end-_bb_start; m++ ) | |
2512 if( _scheduled[m] == n ) | |
2513 break; | |
2514 assert( m < _bb_end-_bb_start, "instruction missing in schedule" ); | |
2515 } | |
2516 #endif | |
2517 | |
2518 // Now copy the instructions (in reverse order) back to the block | |
2519 for ( uint k = _bb_start; k < _bb_end; k++ ) | |
2520 bb->_nodes.map(k, _scheduled[_bb_end-k-1]); | |
2521 | |
2522 #ifndef PRODUCT | |
2523 if (_cfg->C->trace_opto_output()) { | |
2524 tty->print("# Schedule BB#%03d (final)\n", i); | |
2525 uint current = 0; | |
2526 for (uint j = 0; j < bb->_nodes.size(); j++) { | |
2527 Node *n = bb->_nodes[j]; | |
2528 if( valid_bundle_info(n) ) { | |
2529 Bundle *bundle = node_bundling(n); | |
2530 if (bundle->instr_count() > 0 || bundle->flags() > 0) { | |
2531 tty->print("*** Bundle: "); | |
2532 bundle->dump(); | |
2533 } | |
2534 n->dump(); | |
2535 } | |
2536 } | |
2537 } | |
2538 #endif | |
2539 #ifdef ASSERT | |
2540 verify_good_schedule(bb,"after block local scheduling"); | |
2541 #endif | |
2542 } | |
2543 | |
2544 #ifndef PRODUCT | |
2545 if (_cfg->C->trace_opto_output()) | |
2546 tty->print("# <- DoScheduling\n"); | |
2547 #endif | |
2548 | |
2549 // Record final node-bundling array location | |
2550 _regalloc->C->set_node_bundling_base(_node_bundling_base); | |
2551 | |
2552 } // end DoScheduling | |
2553 | |
2554 //------------------------------verify_good_schedule--------------------------- | |
2555 // Verify that no live-range used in the block is killed in the block by a | |
2556 // wrong DEF. This doesn't verify live-ranges that span blocks. | |
2557 | |
2558 // Check for edge existence. Used to avoid adding redundant precedence edges. | |
2559 static bool edge_from_to( Node *from, Node *to ) { | |
2560 for( uint i=0; i<from->len(); i++ ) | |
2561 if( from->in(i) == to ) | |
2562 return true; | |
2563 return false; | |
2564 } | |
2565 | |
2566 #ifdef ASSERT | |
2567 //------------------------------verify_do_def---------------------------------- | |
2568 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) { | |
2569 // Check for bad kills | |
2570 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow | |
2571 Node *prior_use = _reg_node[def]; | |
2572 if( prior_use && !edge_from_to(prior_use,n) ) { | |
2573 tty->print("%s = ",OptoReg::as_VMReg(def)->name()); | |
2574 n->dump(); | |
2575 tty->print_cr("..."); | |
2576 prior_use->dump(); | |
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2577 assert(edge_from_to(prior_use,n),msg); |
0 | 2578 } |
2579 _reg_node.map(def,NULL); // Kill live USEs | |
2580 } | |
2581 } | |
2582 | |
2583 //------------------------------verify_good_schedule--------------------------- | |
2584 void Scheduling::verify_good_schedule( Block *b, const char *msg ) { | |
2585 | |
2586 // Zap to something reasonable for the verify code | |
2587 _reg_node.clear(); | |
2588 | |
2589 // Walk over the block backwards. Check to make sure each DEF doesn't | |
2590 // kill a live value (other than the one it's supposed to). Add each | |
2591 // USE to the live set. | |
2592 for( uint i = b->_nodes.size()-1; i >= _bb_start; i-- ) { | |
2593 Node *n = b->_nodes[i]; | |
2594 int n_op = n->Opcode(); | |
2595 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
2596 // Fat-proj kills a slew of registers | |
2597 RegMask rm = n->out_RegMask();// Make local copy | |
2598 while( rm.is_NotEmpty() ) { | |
2599 OptoReg::Name kill = rm.find_first_elem(); | |
2600 rm.Remove(kill); | |
2601 verify_do_def( n, kill, msg ); | |
2602 } | |
2603 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes | |
2604 // Get DEF'd registers the normal way | |
2605 verify_do_def( n, _regalloc->get_reg_first(n), msg ); | |
2606 verify_do_def( n, _regalloc->get_reg_second(n), msg ); | |
2607 } | |
2608 | |
2609 // Now make all USEs live | |
2610 for( uint i=1; i<n->req(); i++ ) { | |
2611 Node *def = n->in(i); | |
2612 assert(def != 0, "input edge required"); | |
2613 OptoReg::Name reg_lo = _regalloc->get_reg_first(def); | |
2614 OptoReg::Name reg_hi = _regalloc->get_reg_second(def); | |
2615 if( OptoReg::is_valid(reg_lo) ) { | |
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2616 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), msg); |
0 | 2617 _reg_node.map(reg_lo,n); |
2618 } | |
2619 if( OptoReg::is_valid(reg_hi) ) { | |
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2620 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), msg); |
0 | 2621 _reg_node.map(reg_hi,n); |
2622 } | |
2623 } | |
2624 | |
2625 } | |
2626 | |
2627 // Zap to something reasonable for the Antidependence code | |
2628 _reg_node.clear(); | |
2629 } | |
2630 #endif | |
2631 | |
2632 // Conditionally add precedence edges. Avoid putting edges on Projs. | |
2633 static void add_prec_edge_from_to( Node *from, Node *to ) { | |
2634 if( from->is_Proj() ) { // Put precedence edge on Proj's input | |
2635 assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" ); | |
2636 from = from->in(0); | |
2637 } | |
2638 if( from != to && // No cycles (for things like LD L0,[L0+4] ) | |
2639 !edge_from_to( from, to ) ) // Avoid duplicate edge | |
2640 from->add_prec(to); | |
2641 } | |
2642 | |
2643 //------------------------------anti_do_def------------------------------------ | |
2644 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) { | |
2645 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow | |
2646 return; | |
2647 | |
2648 Node *pinch = _reg_node[def_reg]; // Get pinch point | |
2649 if( !pinch || _bbs[pinch->_idx] != b || // No pinch-point yet? | |
2650 is_def ) { // Check for a true def (not a kill) | |
2651 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point | |
2652 return; | |
2653 } | |
2654 | |
2655 Node *kill = def; // Rename 'def' to more descriptive 'kill' | |
2656 debug_only( def = (Node*)0xdeadbeef; ) | |
2657 | |
2658 // After some number of kills there _may_ be a later def | |
2659 Node *later_def = NULL; | |
2660 | |
2661 // Finding a kill requires a real pinch-point. | |
2662 // Check for not already having a pinch-point. | |
2663 // Pinch points are Op_Node's. | |
2664 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point? | |
2665 later_def = pinch; // Must be def/kill as optimistic pinch-point | |
2666 if ( _pinch_free_list.size() > 0) { | |
2667 pinch = _pinch_free_list.pop(); | |
2668 } else { | |
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2669 pinch = new (_cfg->C) Node(1); // Pinch point to-be |
0 | 2670 } |
2671 if (pinch->_idx >= _regalloc->node_regs_max_index()) { | |
2672 _cfg->C->record_method_not_compilable("too many D-U pinch points"); | |
2673 return; | |
2674 } | |
2675 _bbs.map(pinch->_idx,b); // Pretend it's valid in this block (lazy init) | |
2676 _reg_node.map(def_reg,pinch); // Record pinch-point | |
2677 //_regalloc->set_bad(pinch->_idx); // Already initialized this way. | |
2678 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill | |
2679 pinch->init_req(0, _cfg->C->top()); // set not NULL for the next call | |
2680 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch | |
2681 later_def = NULL; // and no later def | |
2682 } | |
2683 pinch->set_req(0,later_def); // Hook later def so we can find it | |
2684 } else { // Else have valid pinch point | |
2685 if( pinch->in(0) ) // If there is a later-def | |
2686 later_def = pinch->in(0); // Get it | |
2687 } | |
2688 | |
2689 // Add output-dependence edge from later def to kill | |
2690 if( later_def ) // If there is some original def | |
2691 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill | |
2692 | |
2693 // See if current kill is also a use, and so is forced to be the pinch-point. | |
2694 if( pinch->Opcode() == Op_Node ) { | |
2695 Node *uses = kill->is_Proj() ? kill->in(0) : kill; | |
2696 for( uint i=1; i<uses->req(); i++ ) { | |
2697 if( _regalloc->get_reg_first(uses->in(i)) == def_reg || | |
2698 _regalloc->get_reg_second(uses->in(i)) == def_reg ) { | |
2699 // Yes, found a use/kill pinch-point | |
2700 pinch->set_req(0,NULL); // | |
2701 pinch->replace_by(kill); // Move anti-dep edges up | |
2702 pinch = kill; | |
2703 _reg_node.map(def_reg,pinch); | |
2704 return; | |
2705 } | |
2706 } | |
2707 } | |
2708 | |
2709 // Add edge from kill to pinch-point | |
2710 add_prec_edge_from_to(kill,pinch); | |
2711 } | |
2712 | |
2713 //------------------------------anti_do_use------------------------------------ | |
2714 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) { | |
2715 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow | |
2716 return; | |
2717 Node *pinch = _reg_node[use_reg]; // Get pinch point | |
2718 // Check for no later def_reg/kill in block | |
2719 if( pinch && _bbs[pinch->_idx] == b && | |
2720 // Use has to be block-local as well | |
2721 _bbs[use->_idx] == b ) { | |
2722 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?) | |
2723 pinch->req() == 1 ) { // pinch not yet in block? | |
2724 pinch->del_req(0); // yank pointer to later-def, also set flag | |
2725 // Insert the pinch-point in the block just after the last use | |
2726 b->_nodes.insert(b->find_node(use)+1,pinch); | |
2727 _bb_end++; // Increase size scheduled region in block | |
2728 } | |
2729 | |
2730 add_prec_edge_from_to(pinch,use); | |
2731 } | |
2732 } | |
2733 | |
2734 //------------------------------ComputeRegisterAntidependences----------------- | |
2735 // We insert antidependences between the reads and following write of | |
2736 // allocated registers to prevent illegal code motion. Hopefully, the | |
2737 // number of added references should be fairly small, especially as we | |
2738 // are only adding references within the current basic block. | |
2739 void Scheduling::ComputeRegisterAntidependencies(Block *b) { | |
2740 | |
2741 #ifdef ASSERT | |
2742 verify_good_schedule(b,"before block local scheduling"); | |
2743 #endif | |
2744 | |
2745 // A valid schedule, for each register independently, is an endless cycle | |
2746 // of: a def, then some uses (connected to the def by true dependencies), | |
2747 // then some kills (defs with no uses), finally the cycle repeats with a new | |
2748 // def. The uses are allowed to float relative to each other, as are the | |
2749 // kills. No use is allowed to slide past a kill (or def). This requires | |
2750 // antidependencies between all uses of a single def and all kills that | |
2751 // follow, up to the next def. More edges are redundant, because later defs | |
2752 // & kills are already serialized with true or antidependencies. To keep | |
2753 // the edge count down, we add a 'pinch point' node if there's more than | |
2754 // one use or more than one kill/def. | |
2755 | |
2756 // We add dependencies in one bottom-up pass. | |
2757 | |
2758 // For each instruction we handle it's DEFs/KILLs, then it's USEs. | |
2759 | |
2760 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this | |
2761 // register. If not, we record the DEF/KILL in _reg_node, the | |
2762 // register-to-def mapping. If there is a prior DEF/KILL, we insert a | |
2763 // "pinch point", a new Node that's in the graph but not in the block. | |
2764 // We put edges from the prior and current DEF/KILLs to the pinch point. | |
2765 // We put the pinch point in _reg_node. If there's already a pinch point | |
2766 // we merely add an edge from the current DEF/KILL to the pinch point. | |
2767 | |
2768 // After doing the DEF/KILLs, we handle USEs. For each used register, we | |
2769 // put an edge from the pinch point to the USE. | |
2770 | |
2771 // To be expedient, the _reg_node array is pre-allocated for the whole | |
2772 // compilation. _reg_node is lazily initialized; it either contains a NULL, | |
2773 // or a valid def/kill/pinch-point, or a leftover node from some prior | |
2774 // block. Leftover node from some prior block is treated like a NULL (no | |
2775 // prior def, so no anti-dependence needed). Valid def is distinguished by | |
2776 // it being in the current block. | |
2777 bool fat_proj_seen = false; | |
2778 uint last_safept = _bb_end-1; | |
2779 Node* end_node = (_bb_end-1 >= _bb_start) ? b->_nodes[last_safept] : NULL; | |
2780 Node* last_safept_node = end_node; | |
2781 for( uint i = _bb_end-1; i >= _bb_start; i-- ) { | |
2782 Node *n = b->_nodes[i]; | |
2783 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges | |
3842 | 2784 if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) { |
0 | 2785 // Fat-proj kills a slew of registers |
2786 // This can add edges to 'n' and obscure whether or not it was a def, | |
2787 // hence the is_def flag. | |
2788 fat_proj_seen = true; | |
2789 RegMask rm = n->out_RegMask();// Make local copy | |
2790 while( rm.is_NotEmpty() ) { | |
2791 OptoReg::Name kill = rm.find_first_elem(); | |
2792 rm.Remove(kill); | |
2793 anti_do_def( b, n, kill, is_def ); | |
2794 } | |
2795 } else { | |
2796 // Get DEF'd registers the normal way | |
2797 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def ); | |
2798 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def ); | |
2799 } | |
2800 | |
3851 | 2801 // Kill projections on a branch should appear to occur on the |
2802 // branch, not afterwards, so grab the masks from the projections | |
2803 // and process them. | |
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2804 if (n->is_MachBranch() || n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump) { |
3851 | 2805 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
2806 Node* use = n->fast_out(i); | |
2807 if (use->is_Proj()) { | |
2808 RegMask rm = use->out_RegMask();// Make local copy | |
2809 while( rm.is_NotEmpty() ) { | |
2810 OptoReg::Name kill = rm.find_first_elem(); | |
2811 rm.Remove(kill); | |
2812 anti_do_def( b, n, kill, false ); | |
2813 } | |
2814 } | |
2815 } | |
2816 } | |
2817 | |
0 | 2818 // Check each register used by this instruction for a following DEF/KILL |
2819 // that must occur afterward and requires an anti-dependence edge. | |
2820 for( uint j=0; j<n->req(); j++ ) { | |
2821 Node *def = n->in(j); | |
2822 if( def ) { | |
3842 | 2823 assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" ); |
0 | 2824 anti_do_use( b, n, _regalloc->get_reg_first(def) ); |
2825 anti_do_use( b, n, _regalloc->get_reg_second(def) ); | |
2826 } | |
2827 } | |
2828 // Do not allow defs of new derived values to float above GC | |
2829 // points unless the base is definitely available at the GC point. | |
2830 | |
2831 Node *m = b->_nodes[i]; | |
2832 | |
2833 // Add precedence edge from following safepoint to use of derived pointer | |
2834 if( last_safept_node != end_node && | |
2835 m != last_safept_node) { | |
2836 for (uint k = 1; k < m->req(); k++) { | |
2837 const Type *t = m->in(k)->bottom_type(); | |
2838 if( t->isa_oop_ptr() && | |
2839 t->is_ptr()->offset() != 0 ) { | |
2840 last_safept_node->add_prec( m ); | |
2841 break; | |
2842 } | |
2843 } | |
2844 } | |
2845 | |
2846 if( n->jvms() ) { // Precedence edge from derived to safept | |
2847 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use() | |
2848 if( b->_nodes[last_safept] != last_safept_node ) { | |
2849 last_safept = b->find_node(last_safept_node); | |
2850 } | |
2851 for( uint j=last_safept; j > i; j-- ) { | |
2852 Node *mach = b->_nodes[j]; | |
2853 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP ) | |
2854 mach->add_prec( n ); | |
2855 } | |
2856 last_safept = i; | |
2857 last_safept_node = m; | |
2858 } | |
2859 } | |
2860 | |
2861 if (fat_proj_seen) { | |
2862 // Garbage collect pinch nodes that were not consumed. | |
2863 // They are usually created by a fat kill MachProj for a call. | |
2864 garbage_collect_pinch_nodes(); | |
2865 } | |
2866 } | |
2867 | |
2868 //------------------------------garbage_collect_pinch_nodes------------------------------- | |
2869 | |
2870 // Garbage collect pinch nodes for reuse by other blocks. | |
2871 // | |
2872 // The block scheduler's insertion of anti-dependence | |
2873 // edges creates many pinch nodes when the block contains | |
2874 // 2 or more Calls. A pinch node is used to prevent a | |
2875 // combinatorial explosion of edges. If a set of kills for a | |
2876 // register is anti-dependent on a set of uses (or defs), rather | |
2877 // than adding an edge in the graph between each pair of kill | |
2878 // and use (or def), a pinch is inserted between them: | |
2879 // | |
2880 // use1 use2 use3 | |
2881 // \ | / | |
2882 // \ | / | |
2883 // pinch | |
2884 // / | \ | |
2885 // / | \ | |
2886 // kill1 kill2 kill3 | |
2887 // | |
2888 // One pinch node is created per register killed when | |
2889 // the second call is encountered during a backwards pass | |
2890 // over the block. Most of these pinch nodes are never | |
2891 // wired into the graph because the register is never | |
2892 // used or def'ed in the block. | |
2893 // | |
2894 void Scheduling::garbage_collect_pinch_nodes() { | |
2895 #ifndef PRODUCT | |
2896 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:"); | |
2897 #endif | |
2898 int trace_cnt = 0; | |
2899 for (uint k = 0; k < _reg_node.Size(); k++) { | |
2900 Node* pinch = _reg_node[k]; | |
2901 if (pinch != NULL && pinch->Opcode() == Op_Node && | |
2902 // no predecence input edges | |
2903 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) { | |
2904 cleanup_pinch(pinch); | |
2905 _pinch_free_list.push(pinch); | |
2906 _reg_node.map(k, NULL); | |
2907 #ifndef PRODUCT | |
2908 if (_cfg->C->trace_opto_output()) { | |
2909 trace_cnt++; | |
2910 if (trace_cnt > 40) { | |
2911 tty->print("\n"); | |
2912 trace_cnt = 0; | |
2913 } | |
2914 tty->print(" %d", pinch->_idx); | |
2915 } | |
2916 #endif | |
2917 } | |
2918 } | |
2919 #ifndef PRODUCT | |
2920 if (_cfg->C->trace_opto_output()) tty->print("\n"); | |
2921 #endif | |
2922 } | |
2923 | |
2924 // Clean up a pinch node for reuse. | |
2925 void Scheduling::cleanup_pinch( Node *pinch ) { | |
2926 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking"); | |
2927 | |
2928 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) { | |
2929 Node* use = pinch->last_out(i); | |
2930 uint uses_found = 0; | |
2931 for (uint j = use->req(); j < use->len(); j++) { | |
2932 if (use->in(j) == pinch) { | |
2933 use->rm_prec(j); | |
2934 uses_found++; | |
2935 } | |
2936 } | |
2937 assert(uses_found > 0, "must be a precedence edge"); | |
2938 i -= uses_found; // we deleted 1 or more copies of this edge | |
2939 } | |
2940 // May have a later_def entry | |
2941 pinch->set_req(0, NULL); | |
2942 } | |
2943 | |
2944 //------------------------------print_statistics------------------------------- | |
2945 #ifndef PRODUCT | |
2946 | |
2947 void Scheduling::dump_available() const { | |
2948 tty->print("#Availist "); | |
2949 for (uint i = 0; i < _available.size(); i++) | |
2950 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]); | |
2951 tty->cr(); | |
2952 } | |
2953 | |
2954 // Print Scheduling Statistics | |
2955 void Scheduling::print_statistics() { | |
2956 // Print the size added by nops for bundling | |
2957 tty->print("Nops added %d bytes to total of %d bytes", | |
2958 _total_nop_size, _total_method_size); | |
2959 if (_total_method_size > 0) | |
2960 tty->print(", for %.2f%%", | |
2961 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0); | |
2962 tty->print("\n"); | |
2963 | |
2964 // Print the number of branch shadows filled | |
2965 if (Pipeline::_branch_has_delay_slot) { | |
2966 tty->print("Of %d branches, %d had unconditional delay slots filled", | |
2967 _total_branches, _total_unconditional_delays); | |
2968 if (_total_branches > 0) | |
2969 tty->print(", for %.2f%%", | |
2970 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0); | |
2971 tty->print("\n"); | |
2972 } | |
2973 | |
2974 uint total_instructions = 0, total_bundles = 0; | |
2975 | |
2976 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) { | |
2977 uint bundle_count = _total_instructions_per_bundle[i]; | |
2978 total_instructions += bundle_count * i; | |
2979 total_bundles += bundle_count; | |
2980 } | |
2981 | |
2982 if (total_bundles > 0) | |
2983 tty->print("Average ILP (excluding nops) is %.2f\n", | |
2984 ((double)total_instructions) / ((double)total_bundles)); | |
2985 } | |
2986 #endif |