Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/output.cpp @ 17985:4077c61b03a0
8046516: Segmentation fault in JVM (easily reproducible)
Summary: Place new nodes on the previous loop exit in reorg_offsets().
Reviewed-by: roland
author | kvn |
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date | Thu, 12 Jun 2014 10:15:43 -0700 |
parents | 0bf37f737702 |
children | 52b4284cb496 b6a8cc1e0d92 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2013, 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 #ifndef PRODUCT | |
46 #define DEBUG_ARG(x) , x | |
47 #else | |
48 #define DEBUG_ARG(x) | |
49 #endif | |
50 | |
51 // Convert Nodes to instruction bits and pass off to the VM | |
52 void Compile::Output() { | |
53 // RootNode goes | |
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54 assert( _cfg->get_root_block()->number_of_nodes() == 0, "" ); |
0 | 55 |
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56 // The number of new nodes (mostly MachNop) is proportional to |
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57 // the number of java calls and inner loops which are aligned. |
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58 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 + |
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59 C->inner_loops()*(OptoLoopAlignment-1)), |
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60 "out of nodes before code generation" ) ) { |
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61 return; |
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62 } |
0 | 63 // Make sure I can find the Start Node |
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64 Block *entry = _cfg->get_block(1); |
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65 Block *broot = _cfg->get_root_block(); |
0 | 66 |
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67 const StartNode *start = entry->head()->as_Start(); |
0 | 68 |
69 // Replace StartNode with prolog | |
70 MachPrologNode *prolog = new (this) MachPrologNode(); | |
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71 entry->map_node(prolog, 0); |
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72 _cfg->map_node_to_block(prolog, entry); |
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73 _cfg->unmap_node_from_block(start); // start is no longer in any block |
0 | 74 |
75 // Virtual methods need an unverified entry point | |
76 | |
77 if( is_osr_compilation() ) { | |
78 if( PoisonOSREntry ) { | |
79 // TODO: Should use a ShouldNotReachHereNode... | |
80 _cfg->insert( broot, 0, new (this) MachBreakpointNode() ); | |
81 } | |
82 } else { | |
83 if( _method && !_method->flags().is_static() ) { | |
84 // Insert unvalidated entry point | |
85 _cfg->insert( broot, 0, new (this) MachUEPNode() ); | |
86 } | |
87 | |
88 } | |
89 | |
90 | |
91 // Break before main entry point | |
92 if( (_method && _method->break_at_execute()) | |
93 #ifndef PRODUCT | |
94 ||(OptoBreakpoint && is_method_compilation()) | |
95 ||(OptoBreakpointOSR && is_osr_compilation()) | |
96 ||(OptoBreakpointC2R && !_method) | |
97 #endif | |
98 ) { | |
99 // checking for _method means that OptoBreakpoint does not apply to | |
100 // runtime stubs or frame converters | |
101 _cfg->insert( entry, 1, new (this) MachBreakpointNode() ); | |
102 } | |
103 | |
104 // Insert epilogs before every return | |
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105 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
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106 Block* block = _cfg->get_block(i); |
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107 if (!block->is_connector() && block->non_connector_successor(0) == _cfg->get_root_block()) { // Found a program exit point? |
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108 Node* m = block->end(); |
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109 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt) { |
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110 MachEpilogNode* epilog = new (this) MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return); |
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111 block->add_inst(epilog); |
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112 _cfg->map_node_to_block(epilog, block); |
0 | 113 } |
114 } | |
115 } | |
116 | |
117 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
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118 if (ZapDeadCompiledLocals) { |
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119 Insert_zap_nodes(); |
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120 } |
0 | 121 # endif |
122 | |
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123 uint* blk_starts = NEW_RESOURCE_ARRAY(uint, _cfg->number_of_blocks() + 1); |
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124 blk_starts[0] = 0; |
3851 | 125 |
126 // Initialize code buffer and process short branches. | |
127 CodeBuffer* cb = init_buffer(blk_starts); | |
128 | |
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129 if (cb == NULL || failing()) { |
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130 return; |
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131 } |
3851 | 132 |
0 | 133 ScheduleAndBundle(); |
134 | |
135 #ifndef PRODUCT | |
136 if (trace_opto_output()) { | |
137 tty->print("\n---- After ScheduleAndBundle ----\n"); | |
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138 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
0 | 139 tty->print("\nBB#%03d:\n", i); |
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140 Block* block = _cfg->get_block(i); |
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141 for (uint j = 0; j < block->number_of_nodes(); j++) { |
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142 Node* n = block->get_node(j); |
0 | 143 OptoReg::Name reg = _regalloc->get_reg_first(n); |
144 tty->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : ""); | |
145 n->dump(); | |
146 } | |
147 } | |
148 } | |
149 #endif | |
150 | |
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151 if (failing()) { |
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152 return; |
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153 } |
0 | 154 |
155 BuildOopMaps(); | |
156 | |
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157 if (failing()) { |
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158 return; |
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159 } |
0 | 160 |
3851 | 161 fill_buffer(cb, blk_starts); |
0 | 162 } |
163 | |
164 bool Compile::need_stack_bang(int frame_size_in_bytes) const { | |
165 // Determine if we need to generate a stack overflow check. | |
166 // Do it if the method is not a stub function and | |
167 // has java calls or has frame size > vm_page_size/8. | |
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168 // The debug VM checks that deoptimization doesn't trigger an |
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169 // unexpected stack overflow (compiled method stack banging should |
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170 // guarantee it doesn't happen) so we always need the stack bang in |
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171 // a debug VM. |
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172 return (UseStackBanging && stub_function() == NULL && |
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173 (has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3 |
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174 DEBUG_ONLY(|| true))); |
0 | 175 } |
176 | |
177 bool Compile::need_register_stack_bang() const { | |
178 // Determine if we need to generate a register stack overflow check. | |
179 // This is only used on architectures which have split register | |
180 // and memory stacks (ie. IA64). | |
181 // Bang if the method is not a stub function and has java calls | |
182 return (stub_function() == NULL && has_java_calls()); | |
183 } | |
184 | |
185 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
186 | |
187 | |
188 // In order to catch compiler oop-map bugs, we have implemented | |
189 // a debugging mode called ZapDeadCompilerLocals. | |
190 // This mode causes the compiler to insert a call to a runtime routine, | |
191 // "zap_dead_locals", right before each place in compiled code | |
192 // that could potentially be a gc-point (i.e., a safepoint or oop map point). | |
193 // The runtime routine checks that locations mapped as oops are really | |
194 // oops, that locations mapped as values do not look like oops, | |
195 // and that locations mapped as dead are not used later | |
196 // (by zapping them to an invalid address). | |
197 | |
198 int Compile::_CompiledZap_count = 0; | |
199 | |
200 void Compile::Insert_zap_nodes() { | |
201 bool skip = false; | |
202 | |
203 | |
204 // Dink with static counts because code code without the extra | |
205 // runtime calls is MUCH faster for debugging purposes | |
206 | |
207 if ( CompileZapFirst == 0 ) ; // nothing special | |
208 else if ( CompileZapFirst > CompiledZap_count() ) skip = true; | |
209 else if ( CompileZapFirst == CompiledZap_count() ) | |
210 warning("starting zap compilation after skipping"); | |
211 | |
212 if ( CompileZapLast == -1 ) ; // nothing special | |
213 else if ( CompileZapLast < CompiledZap_count() ) skip = true; | |
214 else if ( CompileZapLast == CompiledZap_count() ) | |
215 warning("about to compile last zap"); | |
216 | |
217 ++_CompiledZap_count; // counts skipped zaps, too | |
218 | |
219 if ( skip ) return; | |
220 | |
221 | |
222 if ( _method == NULL ) | |
223 return; // no safepoints/oopmaps emitted for calls in stubs,so we don't care | |
224 | |
225 // Insert call to zap runtime stub before every node with an oop map | |
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226 for( uint i=0; i<_cfg->number_of_blocks(); i++ ) { |
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227 Block *b = _cfg->get_block(i); |
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228 for ( uint j = 0; j < b->number_of_nodes(); ++j ) { |
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229 Node *n = b->get_node(j); |
0 | 230 |
231 // Determining if we should insert a zap-a-lot node in output. | |
232 // We do that for all nodes that has oopmap info, except for calls | |
233 // to allocation. Calls to allocation passes in the old top-of-eden pointer | |
234 // and expect the C code to reset it. Hence, there can be no safepoints between | |
235 // the inlined-allocation and the call to new_Java, etc. | |
236 // We also cannot zap monitor calls, as they must hold the microlock | |
237 // during the call to Zap, which also wants to grab the microlock. | |
238 bool insert = n->is_MachSafePoint() && (n->as_MachSafePoint()->oop_map() != NULL); | |
239 if ( insert ) { // it is MachSafePoint | |
240 if ( !n->is_MachCall() ) { | |
241 insert = false; | |
242 } else if ( n->is_MachCall() ) { | |
243 MachCallNode* call = n->as_MachCall(); | |
244 if (call->entry_point() == OptoRuntime::new_instance_Java() || | |
245 call->entry_point() == OptoRuntime::new_array_Java() || | |
246 call->entry_point() == OptoRuntime::multianewarray2_Java() || | |
247 call->entry_point() == OptoRuntime::multianewarray3_Java() || | |
248 call->entry_point() == OptoRuntime::multianewarray4_Java() || | |
249 call->entry_point() == OptoRuntime::multianewarray5_Java() || | |
250 call->entry_point() == OptoRuntime::slow_arraycopy_Java() || | |
251 call->entry_point() == OptoRuntime::complete_monitor_locking_Java() | |
252 ) { | |
253 insert = false; | |
254 } | |
255 } | |
256 if (insert) { | |
257 Node *zap = call_zap_node(n->as_MachSafePoint(), i); | |
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258 b->insert_node(zap, j); |
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259 _cfg->map_node_to_block(zap, b); |
0 | 260 ++j; |
261 } | |
262 } | |
263 } | |
264 } | |
265 } | |
266 | |
267 | |
268 Node* Compile::call_zap_node(MachSafePointNode* node_to_check, int block_no) { | |
269 const TypeFunc *tf = OptoRuntime::zap_dead_locals_Type(); | |
270 CallStaticJavaNode* ideal_node = | |
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271 new (this) CallStaticJavaNode( tf, |
0 | 272 OptoRuntime::zap_dead_locals_stub(_method->flags().is_native()), |
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273 "call zap dead locals stub", 0, TypePtr::BOTTOM); |
0 | 274 // We need to copy the OopMap from the site we're zapping at. |
275 // We have to make a copy, because the zap site might not be | |
276 // a call site, and zap_dead is a call site. | |
277 OopMap* clone = node_to_check->oop_map()->deep_copy(); | |
278 | |
279 // Add the cloned OopMap to the zap node | |
280 ideal_node->set_oop_map(clone); | |
281 return _matcher->match_sfpt(ideal_node); | |
282 } | |
283 | |
284 bool Compile::is_node_getting_a_safepoint( Node* n) { | |
285 // This code duplicates the logic prior to the call of add_safepoint | |
286 // below in this file. | |
287 if( n->is_MachSafePoint() ) return true; | |
288 return false; | |
289 } | |
290 | |
291 # endif // ENABLE_ZAP_DEAD_LOCALS | |
292 | |
418 | 293 // Compute the size of first NumberOfLoopInstrToAlign instructions at the top |
0 | 294 // of a loop. When aligning a loop we need to provide enough instructions |
295 // in cpu's fetch buffer to feed decoders. The loop alignment could be | |
296 // avoided if we have enough instructions in fetch buffer at the head of a loop. | |
297 // By default, the size is set to 999999 by Block's constructor so that | |
298 // a loop will be aligned if the size is not reset here. | |
299 // | |
300 // Note: Mach instructions could contain several HW instructions | |
301 // so the size is estimated only. | |
302 // | |
303 void Compile::compute_loop_first_inst_sizes() { | |
304 // The next condition is used to gate the loop alignment optimization. | |
305 // Don't aligned a loop if there are enough instructions at the head of a loop | |
306 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad | |
307 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is | |
308 // equal to 11 bytes which is the largest address NOP instruction. | |
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309 if (MaxLoopPad < OptoLoopAlignment - 1) { |
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310 uint last_block = _cfg->number_of_blocks() - 1; |
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311 for (uint i = 1; i <= last_block; i++) { |
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312 Block* block = _cfg->get_block(i); |
0 | 313 // Check the first loop's block which requires an alignment. |
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314 if (block->loop_alignment() > (uint)relocInfo::addr_unit()) { |
0 | 315 uint sum_size = 0; |
316 uint inst_cnt = NumberOfLoopInstrToAlign; | |
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317 inst_cnt = block->compute_first_inst_size(sum_size, inst_cnt, _regalloc); |
418 | 318 |
319 // Check subsequent fallthrough blocks if the loop's first | |
320 // block(s) does not have enough instructions. | |
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321 Block *nb = block; |
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322 while(inst_cnt > 0 && |
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323 i < last_block && |
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324 !_cfg->get_block(i + 1)->has_loop_alignment() && |
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325 !nb->has_successor(block)) { |
418 | 326 i++; |
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327 nb = _cfg->get_block(i); |
418 | 328 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, _regalloc); |
329 } // while( inst_cnt > 0 && i < last_block ) | |
330 | |
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331 block->set_first_inst_size(sum_size); |
0 | 332 } // f( b->head()->is_Loop() ) |
333 } // for( i <= last_block ) | |
334 } // if( MaxLoopPad < OptoLoopAlignment-1 ) | |
335 } | |
336 | |
337 // The architecture description provides short branch variants for some long | |
338 // branch instructions. Replace eligible long branches with short branches. | |
3851 | 339 void Compile::shorten_branches(uint* blk_starts, int& code_size, int& reloc_size, int& stub_size) { |
0 | 340 // Compute size of each block, method size, and relocation information size |
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341 uint nblocks = _cfg->number_of_blocks(); |
3851 | 342 |
343 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks); | |
344 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks); | |
345 int* jmp_nidx = NEW_RESOURCE_ARRAY(int ,nblocks); | |
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346 |
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347 // Collect worst case block paddings |
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348 int* block_worst_case_pad = NEW_RESOURCE_ARRAY(int, nblocks); |
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349 memset(block_worst_case_pad, 0, nblocks * sizeof(int)); |
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350 |
3851 | 351 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); ) |
352 DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); ) | |
353 | |
354 bool has_short_branch_candidate = false; | |
0 | 355 |
356 // Initialize the sizes to 0 | |
357 code_size = 0; // Size in bytes of generated code | |
358 stub_size = 0; // Size in bytes of all stub entries | |
359 // Size in bytes of all relocation entries, including those in local stubs. | |
360 // Start with 2-bytes of reloc info for the unvalidated entry point | |
361 reloc_size = 1; // Number of relocation entries | |
362 | |
363 // Make three passes. The first computes pessimistic blk_starts, | |
3851 | 364 // relative jmp_offset and reloc_size information. The second performs |
2008 | 365 // short branch substitution using the pessimistic sizing. The |
366 // third inserts nops where needed. | |
0 | 367 |
368 // Step one, perform a pessimistic sizing pass. | |
3851 | 369 uint last_call_adr = max_uint; |
370 uint last_avoid_back_to_back_adr = max_uint; | |
0 | 371 uint nop_size = (new (this) MachNopNode())->size(_regalloc); |
3851 | 372 for (uint i = 0; i < nblocks; i++) { // For all blocks |
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373 Block* block = _cfg->get_block(i); |
0 | 374 |
3851 | 375 // During short branch replacement, we store the relative (to blk_starts) |
376 // offset of jump in jmp_offset, rather than the absolute offset of jump. | |
377 // This is so that we do not need to recompute sizes of all nodes when | |
378 // we compute correct blk_starts in our next sizing pass. | |
379 jmp_offset[i] = 0; | |
380 jmp_size[i] = 0; | |
381 jmp_nidx[i] = -1; | |
382 DEBUG_ONLY( jmp_target[i] = 0; ) | |
383 DEBUG_ONLY( jmp_rule[i] = 0; ) | |
384 | |
0 | 385 // Sum all instruction sizes to compute block size |
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386 uint last_inst = block->number_of_nodes(); |
0 | 387 uint blk_size = 0; |
3851 | 388 for (uint j = 0; j < last_inst; j++) { |
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389 Node* nj = block->get_node(j); |
0 | 390 // Handle machine instruction nodes |
3851 | 391 if (nj->is_Mach()) { |
0 | 392 MachNode *mach = nj->as_Mach(); |
393 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding | |
394 reloc_size += mach->reloc(); | |
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395 if (mach->is_MachCall()) { |
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396 // add size information for trampoline stub |
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397 // class CallStubImpl is platform-specific and defined in the *.ad files. |
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398 stub_size += CallStubImpl::size_call_trampoline(); |
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399 reloc_size += CallStubImpl::reloc_call_trampoline(); |
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400 |
0 | 401 MachCallNode *mcall = mach->as_MachCall(); |
402 // This destination address is NOT PC-relative | |
403 | |
404 mcall->method_set((intptr_t)mcall->entry_point()); | |
405 | |
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406 if (mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method) { |
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407 stub_size += CompiledStaticCall::to_interp_stub_size(); |
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408 reloc_size += CompiledStaticCall::reloc_to_interp_stub(); |
0 | 409 } |
410 } else if (mach->is_MachSafePoint()) { | |
411 // If call/safepoint are adjacent, account for possible | |
412 // nop to disambiguate the two safepoints. | |
3851 | 413 // ScheduleAndBundle() can rearrange nodes in a block, |
414 // check for all offsets inside this block. | |
415 if (last_call_adr >= blk_starts[i]) { | |
416 blk_size += nop_size; | |
417 } | |
418 } | |
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419 if (mach->avoid_back_to_back(MachNode::AVOID_BEFORE)) { |
3851 | 420 // Nop is inserted between "avoid back to back" instructions. |
421 // ScheduleAndBundle() can rearrange nodes in a block, | |
422 // check for all offsets inside this block. | |
423 if (last_avoid_back_to_back_adr >= blk_starts[i]) { | |
0 | 424 blk_size += nop_size; |
425 } | |
426 } | |
3851 | 427 if (mach->may_be_short_branch()) { |
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428 if (!nj->is_MachBranch()) { |
3851 | 429 #ifndef PRODUCT |
430 nj->dump(3); | |
431 #endif | |
432 Unimplemented(); | |
433 } | |
434 assert(jmp_nidx[i] == -1, "block should have only one branch"); | |
435 jmp_offset[i] = blk_size; | |
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436 jmp_size[i] = nj->size(_regalloc); |
3851 | 437 jmp_nidx[i] = j; |
438 has_short_branch_candidate = true; | |
439 } | |
0 | 440 } |
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441 blk_size += nj->size(_regalloc); |
0 | 442 // Remember end of call offset |
3842 | 443 if (nj->is_MachCall() && !nj->is_MachCallLeaf()) { |
3851 | 444 last_call_adr = blk_starts[i]+blk_size; |
445 } | |
446 // Remember end of avoid_back_to_back offset | |
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447 if (nj->is_Mach() && nj->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) { |
3851 | 448 last_avoid_back_to_back_adr = blk_starts[i]+blk_size; |
0 | 449 } |
450 } | |
451 | |
452 // When the next block starts a loop, we may insert pad NOP | |
453 // instructions. Since we cannot know our future alignment, | |
454 // assume the worst. | |
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455 if (i < nblocks - 1) { |
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456 Block* nb = _cfg->get_block(i + 1); |
0 | 457 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit(); |
3851 | 458 if (max_loop_pad > 0) { |
0 | 459 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), ""); |
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460 // Adjust last_call_adr and/or last_avoid_back_to_back_adr. |
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461 // If either is the last instruction in this block, bump by |
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462 // max_loop_pad in lock-step with blk_size, so sizing |
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463 // calculations in subsequent blocks still can conservatively |
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464 // detect that it may the last instruction in this block. |
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465 if (last_call_adr == blk_starts[i]+blk_size) { |
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466 last_call_adr += max_loop_pad; |
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467 } |
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468 if (last_avoid_back_to_back_adr == blk_starts[i]+blk_size) { |
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469 last_avoid_back_to_back_adr += max_loop_pad; |
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470 } |
0 | 471 blk_size += max_loop_pad; |
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472 block_worst_case_pad[i + 1] = max_loop_pad; |
0 | 473 } |
474 } | |
475 | |
476 // Save block size; update total method size | |
477 blk_starts[i+1] = blk_starts[i]+blk_size; | |
478 } | |
479 | |
480 // Step two, replace eligible long jumps. | |
3851 | 481 bool progress = true; |
482 uint last_may_be_short_branch_adr = max_uint; | |
483 while (has_short_branch_candidate && progress) { | |
484 progress = false; | |
485 has_short_branch_candidate = false; | |
486 int adjust_block_start = 0; | |
487 for (uint i = 0; i < nblocks; i++) { | |
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488 Block* block = _cfg->get_block(i); |
3851 | 489 int idx = jmp_nidx[i]; |
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490 MachNode* mach = (idx == -1) ? NULL: block->get_node(idx)->as_Mach(); |
3851 | 491 if (mach != NULL && mach->may_be_short_branch()) { |
492 #ifdef ASSERT | |
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493 assert(jmp_size[i] > 0 && mach->is_MachBranch(), "sanity"); |
3851 | 494 int j; |
495 // Find the branch; ignore trailing NOPs. | |
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496 for (j = block->number_of_nodes()-1; j>=0; j--) { |
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497 Node* n = block->get_node(j); |
3851 | 498 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) |
499 break; | |
500 } | |
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501 assert(j >= 0 && j == idx && block->get_node(j) == (Node*)mach, "sanity"); |
3851 | 502 #endif |
503 int br_size = jmp_size[i]; | |
504 int br_offs = blk_starts[i] + jmp_offset[i]; | |
505 | |
0 | 506 // This requires the TRUE branch target be in succs[0] |
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507 uint bnum = block->non_connector_successor(0)->_pre_order; |
3851 | 508 int offset = blk_starts[bnum] - br_offs; |
509 if (bnum > i) { // adjust following block's offset | |
510 offset -= adjust_block_start; | |
511 } | |
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512 |
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513 // This block can be a loop header, account for the padding |
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514 // in the previous block. |
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515 int block_padding = block_worst_case_pad[i]; |
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516 assert(i == 0 || block_padding == 0 || br_offs >= block_padding, "Should have at least a padding on top"); |
3851 | 517 // In the following code a nop could be inserted before |
518 // the branch which will increase the backward distance. | |
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519 bool needs_padding = ((uint)(br_offs - block_padding) == last_may_be_short_branch_adr); |
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520 assert(!needs_padding || jmp_offset[i] == 0, "padding only branches at the beginning of block"); |
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521 |
3851 | 522 if (needs_padding && offset <= 0) |
523 offset -= nop_size; | |
524 | |
525 if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) { | |
526 // We've got a winner. Replace this branch. | |
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527 MachNode* replacement = mach->as_MachBranch()->short_branch_version(this); |
3851 | 528 |
529 // Update the jmp_size. | |
530 int new_size = replacement->size(_regalloc); | |
531 int diff = br_size - new_size; | |
532 assert(diff >= (int)nop_size, "short_branch size should be smaller"); | |
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533 // Conservatively take into account padding between |
3851 | 534 // avoid_back_to_back branches. Previous branch could be |
535 // converted into avoid_back_to_back branch during next | |
536 // rounds. | |
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537 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) { |
3851 | 538 jmp_offset[i] += nop_size; |
539 diff -= nop_size; | |
0 | 540 } |
3851 | 541 adjust_block_start += diff; |
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542 block->map_node(replacement, idx); |
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543 mach->subsume_by(replacement, C); |
3851 | 544 mach = replacement; |
545 progress = true; | |
546 | |
547 jmp_size[i] = new_size; | |
548 DEBUG_ONLY( jmp_target[i] = bnum; ); | |
549 DEBUG_ONLY( jmp_rule[i] = mach->rule(); ); | |
0 | 550 } else { |
3851 | 551 // The jump distance is not short, try again during next iteration. |
552 has_short_branch_candidate = true; | |
0 | 553 } |
3851 | 554 } // (mach->may_be_short_branch()) |
555 if (mach != NULL && (mach->may_be_short_branch() || | |
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556 mach->avoid_back_to_back(MachNode::AVOID_AFTER))) { |
3851 | 557 last_may_be_short_branch_adr = blk_starts[i] + jmp_offset[i] + jmp_size[i]; |
0 | 558 } |
3851 | 559 blk_starts[i+1] -= adjust_block_start; |
0 | 560 } |
561 } | |
562 | |
563 #ifdef ASSERT | |
3851 | 564 for (uint i = 0; i < nblocks; i++) { // For all blocks |
565 if (jmp_target[i] != 0) { | |
566 int br_size = jmp_size[i]; | |
567 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]); | |
568 if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) { | |
569 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 | 570 } |
3851 | 571 assert(_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset), "Displacement too large for short jmp"); |
0 | 572 } |
573 } | |
574 #endif | |
575 | |
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576 // Step 3, compute the offsets of all blocks, will be done in fill_buffer() |
3851 | 577 // after ScheduleAndBundle(). |
578 | |
0 | 579 // ------------------ |
580 // Compute size for code buffer | |
3851 | 581 code_size = blk_starts[nblocks]; |
0 | 582 |
583 // Relocation records | |
584 reloc_size += 1; // Relo entry for exception handler | |
585 | |
586 // Adjust reloc_size to number of record of relocation info | |
587 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for | |
588 // a relocation index. | |
589 // The CodeBuffer will expand the locs array if this estimate is too low. | |
3851 | 590 reloc_size *= 10 / sizeof(relocInfo); |
591 } | |
592 | |
0 | 593 //------------------------------FillLocArray----------------------------------- |
594 // Create a bit of debug info and append it to the array. The mapping is from | |
595 // Java local or expression stack to constant, register or stack-slot. For | |
596 // doubles, insert 2 mappings and return 1 (to tell the caller that the next | |
597 // entry has been taken care of and caller should skip it). | |
598 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) { | |
599 // This should never have accepted Bad before | |
600 assert(OptoReg::is_valid(regnum), "location must be valid"); | |
601 return (OptoReg::is_reg(regnum)) | |
602 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) ) | |
603 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum))); | |
604 } | |
605 | |
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606 |
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607 ObjectValue* |
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608 Compile::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) { |
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609 for (int i = 0; i < objs->length(); i++) { |
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610 assert(objs->at(i)->is_object(), "corrupt object cache"); |
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611 ObjectValue* sv = (ObjectValue*) objs->at(i); |
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612 if (sv->id() == id) { |
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613 return sv; |
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614 } |
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615 } |
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616 // Otherwise.. |
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617 return NULL; |
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618 } |
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619 |
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620 void Compile::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs, |
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621 ObjectValue* sv ) { |
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622 assert(sv_for_node_id(objs, sv->id()) == NULL, "Precondition"); |
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623 objs->append(sv); |
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624 } |
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625 |
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626 |
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627 void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local, |
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628 GrowableArray<ScopeValue*> *array, |
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629 GrowableArray<ScopeValue*> *objs ) { |
0 | 630 assert( local, "use _top instead of null" ); |
631 if (array->length() != idx) { | |
632 assert(array->length() == idx + 1, "Unexpected array count"); | |
633 // Old functionality: | |
634 // return | |
635 // New functionality: | |
636 // Assert if the local is not top. In product mode let the new node | |
637 // override the old entry. | |
638 assert(local == top(), "LocArray collision"); | |
639 if (local == top()) { | |
640 return; | |
641 } | |
642 array->pop(); | |
643 } | |
644 const Type *t = local->bottom_type(); | |
645 | |
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646 // Is it a safepoint scalar object node? |
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647 if (local->is_SafePointScalarObject()) { |
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648 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject(); |
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649 |
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650 ObjectValue* sv = Compile::sv_for_node_id(objs, spobj->_idx); |
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651 if (sv == NULL) { |
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652 ciKlass* cik = t->is_oopptr()->klass(); |
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653 assert(cik->is_instance_klass() || |
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654 cik->is_array_klass(), "Not supported allocation."); |
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655 sv = new ObjectValue(spobj->_idx, |
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656 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding())); |
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657 Compile::set_sv_for_object_node(objs, sv); |
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658 |
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659 uint first_ind = spobj->first_index(sfpt->jvms()); |
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660 for (uint i = 0; i < spobj->n_fields(); i++) { |
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661 Node* fld_node = sfpt->in(first_ind+i); |
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662 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs); |
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663 } |
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664 } |
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665 array->append(sv); |
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666 return; |
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667 } |
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668 |
0 | 669 // Grab the register number for the local |
670 OptoReg::Name regnum = _regalloc->get_reg_first(local); | |
671 if( OptoReg::is_valid(regnum) ) {// Got a register/stack? | |
672 // Record the double as two float registers. | |
673 // The register mask for such a value always specifies two adjacent | |
674 // float registers, with the lower register number even. | |
675 // Normally, the allocation of high and low words to these registers | |
676 // is irrelevant, because nearly all operations on register pairs | |
677 // (e.g., StoreD) treat them as a single unit. | |
678 // Here, we assume in addition that the words in these two registers | |
679 // stored "naturally" (by operations like StoreD and double stores | |
680 // within the interpreter) such that the lower-numbered register | |
681 // is written to the lower memory address. This may seem like | |
682 // a machine dependency, but it is not--it is a requirement on | |
683 // the author of the <arch>.ad file to ensure that, for every | |
684 // even/odd double-register pair to which a double may be allocated, | |
685 // the word in the even single-register is stored to the first | |
686 // memory word. (Note that register numbers are completely | |
687 // arbitrary, and are not tied to any machine-level encodings.) | |
688 #ifdef _LP64 | |
689 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) { | |
690 array->append(new ConstantIntValue(0)); | |
691 array->append(new_loc_value( _regalloc, regnum, Location::dbl )); | |
692 } else if ( t->base() == Type::Long ) { | |
693 array->append(new ConstantIntValue(0)); | |
694 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
695 } else if ( t->base() == Type::RawPtr ) { | |
696 // jsr/ret return address which must be restored into a the full | |
697 // width 64-bit stack slot. | |
698 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
699 } | |
700 #else //_LP64 | |
701 #ifdef SPARC | |
702 if (t->base() == Type::Long && OptoReg::is_reg(regnum)) { | |
703 // For SPARC we have to swap high and low words for | |
704 // long values stored in a single-register (g0-g7). | |
705 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
706 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
707 } else | |
708 #endif //SPARC | |
709 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) { | |
710 // Repack the double/long as two jints. | |
711 // The convention the interpreter uses is that the second local | |
712 // holds the first raw word of the native double representation. | |
713 // This is actually reasonable, since locals and stack arrays | |
714 // grow downwards in all implementations. | |
715 // (If, on some machine, the interpreter's Java locals or stack | |
716 // were to grow upwards, the embedded doubles would be word-swapped.) | |
717 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
718 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
719 } | |
720 #endif //_LP64 | |
721 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) && | |
722 OptoReg::is_reg(regnum) ) { | |
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723 array->append(new_loc_value( _regalloc, regnum, Matcher::float_in_double() |
0 | 724 ? Location::float_in_dbl : Location::normal )); |
725 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) { | |
726 array->append(new_loc_value( _regalloc, regnum, Matcher::int_in_long | |
727 ? Location::int_in_long : Location::normal )); | |
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728 } else if( t->base() == Type::NarrowOop ) { |
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729 array->append(new_loc_value( _regalloc, regnum, Location::narrowoop )); |
0 | 730 } else { |
731 array->append(new_loc_value( _regalloc, regnum, _regalloc->is_oop(local) ? Location::oop : Location::normal )); | |
732 } | |
733 return; | |
734 } | |
735 | |
736 // No register. It must be constant data. | |
737 switch (t->base()) { | |
738 case Type::Half: // Second half of a double | |
739 ShouldNotReachHere(); // Caller should skip 2nd halves | |
740 break; | |
741 case Type::AnyPtr: | |
742 array->append(new ConstantOopWriteValue(NULL)); | |
743 break; | |
744 case Type::AryPtr: | |
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745 case Type::InstPtr: // fall through |
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746 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->constant_encoding())); |
0 | 747 break; |
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748 case Type::NarrowOop: |
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749 if (t == TypeNarrowOop::NULL_PTR) { |
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750 array->append(new ConstantOopWriteValue(NULL)); |
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751 } else { |
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752 array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->constant_encoding())); |
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753 } |
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754 break; |
0 | 755 case Type::Int: |
756 array->append(new ConstantIntValue(t->is_int()->get_con())); | |
757 break; | |
758 case Type::RawPtr: | |
759 // A return address (T_ADDRESS). | |
760 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI"); | |
761 #ifdef _LP64 | |
762 // Must be restored to the full-width 64-bit stack slot. | |
763 array->append(new ConstantLongValue(t->is_ptr()->get_con())); | |
764 #else | |
765 array->append(new ConstantIntValue(t->is_ptr()->get_con())); | |
766 #endif | |
767 break; | |
768 case Type::FloatCon: { | |
769 float f = t->is_float_constant()->getf(); | |
770 array->append(new ConstantIntValue(jint_cast(f))); | |
771 break; | |
772 } | |
773 case Type::DoubleCon: { | |
774 jdouble d = t->is_double_constant()->getd(); | |
775 #ifdef _LP64 | |
776 array->append(new ConstantIntValue(0)); | |
777 array->append(new ConstantDoubleValue(d)); | |
778 #else | |
779 // Repack the double as two jints. | |
780 // The convention the interpreter uses is that the second local | |
781 // holds the first raw word of the native double representation. | |
782 // This is actually reasonable, since locals and stack arrays | |
783 // grow downwards in all implementations. | |
784 // (If, on some machine, the interpreter's Java locals or stack | |
785 // were to grow upwards, the embedded doubles would be word-swapped.) | |
786 jint *dp = (jint*)&d; | |
787 array->append(new ConstantIntValue(dp[1])); | |
788 array->append(new ConstantIntValue(dp[0])); | |
789 #endif | |
790 break; | |
791 } | |
792 case Type::Long: { | |
793 jlong d = t->is_long()->get_con(); | |
794 #ifdef _LP64 | |
795 array->append(new ConstantIntValue(0)); | |
796 array->append(new ConstantLongValue(d)); | |
797 #else | |
798 // Repack the long as two jints. | |
799 // The convention the interpreter uses is that the second local | |
800 // holds the first raw word of the native double representation. | |
801 // This is actually reasonable, since locals and stack arrays | |
802 // grow downwards in all implementations. | |
803 // (If, on some machine, the interpreter's Java locals or stack | |
804 // were to grow upwards, the embedded doubles would be word-swapped.) | |
805 jint *dp = (jint*)&d; | |
806 array->append(new ConstantIntValue(dp[1])); | |
807 array->append(new ConstantIntValue(dp[0])); | |
808 #endif | |
809 break; | |
810 } | |
811 case Type::Top: // Add an illegal value here | |
812 array->append(new LocationValue(Location())); | |
813 break; | |
814 default: | |
815 ShouldNotReachHere(); | |
816 break; | |
817 } | |
818 } | |
819 | |
820 // Determine if this node starts a bundle | |
821 bool Compile::starts_bundle(const Node *n) const { | |
822 return (_node_bundling_limit > n->_idx && | |
823 _node_bundling_base[n->_idx].starts_bundle()); | |
824 } | |
825 | |
826 //--------------------------Process_OopMap_Node-------------------------------- | |
827 void Compile::Process_OopMap_Node(MachNode *mach, int current_offset) { | |
828 | |
829 // Handle special safepoint nodes for synchronization | |
830 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
831 MachCallNode *mcall; | |
832 | |
833 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
834 assert( is_node_getting_a_safepoint(mach), "logic does not match; false negative"); | |
835 #endif | |
836 | |
837 int safepoint_pc_offset = current_offset; | |
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838 bool is_method_handle_invoke = false; |
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839 bool return_oop = false; |
0 | 840 |
841 // Add the safepoint in the DebugInfoRecorder | |
842 if( !mach->is_MachCall() ) { | |
843 mcall = NULL; | |
844 debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map); | |
845 } else { | |
846 mcall = mach->as_MachCall(); | |
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847 |
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848 // Is the call a MethodHandle call? |
1265 | 849 if (mcall->is_MachCallJava()) { |
850 if (mcall->as_MachCallJava()->_method_handle_invoke) { | |
851 assert(has_method_handle_invokes(), "must have been set during call generation"); | |
852 is_method_handle_invoke = true; | |
853 } | |
854 } | |
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855 |
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856 // Check if a call returns an object. |
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857 if (mcall->return_value_is_used() && |
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858 mcall->tf()->range()->field_at(TypeFunc::Parms)->isa_ptr()) { |
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859 return_oop = true; |
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860 } |
0 | 861 safepoint_pc_offset += mcall->ret_addr_offset(); |
862 debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map); | |
863 } | |
864 | |
865 // Loop over the JVMState list to add scope information | |
866 // Do not skip safepoints with a NULL method, they need monitor info | |
867 JVMState* youngest_jvms = sfn->jvms(); | |
868 int max_depth = youngest_jvms->depth(); | |
869 | |
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870 // Allocate the object pool for scalar-replaced objects -- the map from |
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871 // small-integer keys (which can be recorded in the local and ostack |
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872 // arrays) to descriptions of the object state. |
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873 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>(); |
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874 |
0 | 875 // Visit scopes from oldest to youngest. |
876 for (int depth = 1; depth <= max_depth; depth++) { | |
877 JVMState* jvms = youngest_jvms->of_depth(depth); | |
878 int idx; | |
879 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
880 // Safepoints that do not have method() set only provide oop-map and monitor info | |
881 // to support GC; these do not support deoptimization. | |
882 int num_locs = (method == NULL) ? 0 : jvms->loc_size(); | |
883 int num_exps = (method == NULL) ? 0 : jvms->stk_size(); | |
884 int num_mon = jvms->nof_monitors(); | |
885 assert(method == NULL || jvms->bci() < 0 || num_locs == method->max_locals(), | |
886 "JVMS local count must match that of the method"); | |
887 | |
888 // Add Local and Expression Stack Information | |
889 | |
890 // Insert locals into the locarray | |
891 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs); | |
892 for( idx = 0; idx < num_locs; idx++ ) { | |
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893 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs ); |
0 | 894 } |
895 | |
896 // Insert expression stack entries into the exparray | |
897 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps); | |
898 for( idx = 0; idx < num_exps; idx++ ) { | |
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899 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs ); |
0 | 900 } |
901 | |
902 // Add in mappings of the monitors | |
903 assert( !method || | |
904 !method->is_synchronized() || | |
905 method->is_native() || | |
906 num_mon > 0 || | |
907 !GenerateSynchronizationCode, | |
908 "monitors must always exist for synchronized methods"); | |
909 | |
910 // Build the growable array of ScopeValues for exp stack | |
911 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon); | |
912 | |
913 // Loop over monitors and insert into array | |
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914 for (idx = 0; idx < num_mon; idx++) { |
0 | 915 // Grab the node that defines this monitor |
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916 Node* box_node = sfn->monitor_box(jvms, idx); |
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917 Node* obj_node = sfn->monitor_obj(jvms, idx); |
0 | 918 |
919 // Create ScopeValue for object | |
920 ScopeValue *scval = NULL; | |
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921 |
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922 if (obj_node->is_SafePointScalarObject()) { |
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923 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject(); |
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924 scval = Compile::sv_for_node_id(objs, spobj->_idx); |
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925 if (scval == NULL) { |
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926 const Type *t = spobj->bottom_type(); |
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927 ciKlass* cik = t->is_oopptr()->klass(); |
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928 assert(cik->is_instance_klass() || |
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929 cik->is_array_klass(), "Not supported allocation."); |
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930 ObjectValue* sv = new ObjectValue(spobj->_idx, |
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931 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding())); |
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932 Compile::set_sv_for_object_node(objs, sv); |
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933 |
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934 uint first_ind = spobj->first_index(youngest_jvms); |
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935 for (uint i = 0; i < spobj->n_fields(); i++) { |
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936 Node* fld_node = sfn->in(first_ind+i); |
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937 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs); |
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938 } |
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939 scval = sv; |
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940 } |
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941 } else if (!obj_node->is_Con()) { |
0 | 942 OptoReg::Name obj_reg = _regalloc->get_reg_first(obj_node); |
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943 if( obj_node->bottom_type()->base() == Type::NarrowOop ) { |
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944 scval = new_loc_value( _regalloc, obj_reg, Location::narrowoop ); |
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945 } else { |
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946 scval = new_loc_value( _regalloc, obj_reg, Location::oop ); |
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947 } |
0 | 948 } else { |
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949 const TypePtr *tp = obj_node->get_ptr_type(); |
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950 scval = new ConstantOopWriteValue(tp->is_oopptr()->const_oop()->constant_encoding()); |
0 | 951 } |
952 | |
4777 | 953 OptoReg::Name box_reg = BoxLockNode::reg(box_node); |
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954 Location basic_lock = Location::new_stk_loc(Location::normal,_regalloc->reg2offset(box_reg)); |
4777 | 955 bool eliminated = (box_node->is_BoxLock() && box_node->as_BoxLock()->is_eliminated()); |
956 monarray->append(new MonitorValue(scval, basic_lock, eliminated)); | |
0 | 957 } |
958 | |
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959 // We dump the object pool first, since deoptimization reads it in first. |
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960 debug_info()->dump_object_pool(objs); |
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961 |
0 | 962 // Build first class objects to pass to scope |
963 DebugToken *locvals = debug_info()->create_scope_values(locarray); | |
964 DebugToken *expvals = debug_info()->create_scope_values(exparray); | |
965 DebugToken *monvals = debug_info()->create_monitor_values(monarray); | |
966 | |
967 // Make method available for all Safepoints | |
968 ciMethod* scope_method = method ? method : _method; | |
969 // Describe the scope here | |
970 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI"); | |
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971 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest"); |
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972 // Now we can describe the scope. |
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973 debug_info()->describe_scope(safepoint_pc_offset, scope_method, jvms->bci(), jvms->should_reexecute(), is_method_handle_invoke, return_oop, locvals, expvals, monvals); |
0 | 974 } // End jvms loop |
975 | |
976 // Mark the end of the scope set. | |
977 debug_info()->end_safepoint(safepoint_pc_offset); | |
978 } | |
979 | |
980 | |
981 | |
982 // A simplified version of Process_OopMap_Node, to handle non-safepoints. | |
983 class NonSafepointEmitter { | |
984 Compile* C; | |
985 JVMState* _pending_jvms; | |
986 int _pending_offset; | |
987 | |
988 void emit_non_safepoint(); | |
989 | |
990 public: | |
991 NonSafepointEmitter(Compile* compile) { | |
992 this->C = compile; | |
993 _pending_jvms = NULL; | |
994 _pending_offset = 0; | |
995 } | |
996 | |
997 void observe_instruction(Node* n, int pc_offset) { | |
998 if (!C->debug_info()->recording_non_safepoints()) return; | |
999 | |
1000 Node_Notes* nn = C->node_notes_at(n->_idx); | |
1001 if (nn == NULL || nn->jvms() == NULL) return; | |
1002 if (_pending_jvms != NULL && | |
1003 _pending_jvms->same_calls_as(nn->jvms())) { | |
1004 // Repeated JVMS? Stretch it up here. | |
1005 _pending_offset = pc_offset; | |
1006 } else { | |
1007 if (_pending_jvms != NULL && | |
1008 _pending_offset < pc_offset) { | |
1009 emit_non_safepoint(); | |
1010 } | |
1011 _pending_jvms = NULL; | |
1012 if (pc_offset > C->debug_info()->last_pc_offset()) { | |
1013 // This is the only way _pending_jvms can become non-NULL: | |
1014 _pending_jvms = nn->jvms(); | |
1015 _pending_offset = pc_offset; | |
1016 } | |
1017 } | |
1018 } | |
1019 | |
1020 // Stay out of the way of real safepoints: | |
1021 void observe_safepoint(JVMState* jvms, int pc_offset) { | |
1022 if (_pending_jvms != NULL && | |
1023 !_pending_jvms->same_calls_as(jvms) && | |
1024 _pending_offset < pc_offset) { | |
1025 emit_non_safepoint(); | |
1026 } | |
1027 _pending_jvms = NULL; | |
1028 } | |
1029 | |
1030 void flush_at_end() { | |
1031 if (_pending_jvms != NULL) { | |
1032 emit_non_safepoint(); | |
1033 } | |
1034 _pending_jvms = NULL; | |
1035 } | |
1036 }; | |
1037 | |
1038 void NonSafepointEmitter::emit_non_safepoint() { | |
1039 JVMState* youngest_jvms = _pending_jvms; | |
1040 int pc_offset = _pending_offset; | |
1041 | |
1042 // Clear it now: | |
1043 _pending_jvms = NULL; | |
1044 | |
1045 DebugInformationRecorder* debug_info = C->debug_info(); | |
1046 assert(debug_info->recording_non_safepoints(), "sanity"); | |
1047 | |
1048 debug_info->add_non_safepoint(pc_offset); | |
1049 int max_depth = youngest_jvms->depth(); | |
1050 | |
1051 // Visit scopes from oldest to youngest. | |
1052 for (int depth = 1; depth <= max_depth; depth++) { | |
1053 JVMState* jvms = youngest_jvms->of_depth(depth); | |
1054 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
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1055 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest"); |
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1056 debug_info->describe_scope(pc_offset, method, jvms->bci(), jvms->should_reexecute()); |
0 | 1057 } |
1058 | |
1059 // Mark the end of the scope set. | |
1060 debug_info->end_non_safepoint(pc_offset); | |
1061 } | |
1062 | |
3851 | 1063 //------------------------------init_buffer------------------------------------ |
1064 CodeBuffer* Compile::init_buffer(uint* blk_starts) { | |
0 | 1065 |
1066 // Set the initially allocated size | |
1067 int code_req = initial_code_capacity; | |
1068 int locs_req = initial_locs_capacity; | |
1069 int stub_req = TraceJumps ? initial_stub_capacity * 10 : initial_stub_capacity; | |
1070 int const_req = initial_const_capacity; | |
1071 | |
1072 int pad_req = NativeCall::instruction_size; | |
1073 // The extra spacing after the code is necessary on some platforms. | |
1074 // Sometimes we need to patch in a jump after the last instruction, | |
1075 // if the nmethod has been deoptimized. (See 4932387, 4894843.) | |
1076 | |
1077 // Compute the byte offset where we can store the deopt pc. | |
1078 if (fixed_slots() != 0) { | |
1079 _orig_pc_slot_offset_in_bytes = _regalloc->reg2offset(OptoReg::stack2reg(_orig_pc_slot)); | |
1080 } | |
1081 | |
1082 // Compute prolog code size | |
1083 _method_size = 0; | |
1084 _frame_slots = OptoReg::reg2stack(_matcher->_old_SP)+_regalloc->_framesize; | |
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1085 #if defined(IA64) && !defined(AIX) |
0 | 1086 if (save_argument_registers()) { |
1087 // 4815101: this is a stub with implicit and unknown precision fp args. | |
1088 // The usual spill mechanism can only generate stfd's in this case, which | |
1089 // doesn't work if the fp reg to spill contains a single-precision denorm. | |
1090 // Instead, we hack around the normal spill mechanism using stfspill's and | |
1091 // ldffill's in the MachProlog and MachEpilog emit methods. We allocate | |
1092 // space here for the fp arg regs (f8-f15) we're going to thusly spill. | |
1093 // | |
1094 // If we ever implement 16-byte 'registers' == stack slots, we can | |
1095 // get rid of this hack and have SpillCopy generate stfspill/ldffill | |
1096 // instead of stfd/stfs/ldfd/ldfs. | |
1097 _frame_slots += 8*(16/BytesPerInt); | |
1098 } | |
1099 #endif | |
3851 | 1100 assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check"); |
0 | 1101 |
2008 | 1102 if (has_mach_constant_base_node()) { |
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1103 uint add_size = 0; |
2008 | 1104 // Fill the constant table. |
3851 | 1105 // Note: This must happen before shorten_branches. |
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1106 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
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1107 Block* b = _cfg->get_block(i); |
2008 | 1108 |
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1109 for (uint j = 0; j < b->number_of_nodes(); j++) { |
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1110 Node* n = b->get_node(j); |
2008 | 1111 |
1112 // If the node is a MachConstantNode evaluate the constant | |
1113 // value section. | |
1114 if (n->is_MachConstant()) { | |
1115 MachConstantNode* machcon = n->as_MachConstant(); | |
1116 machcon->eval_constant(C); | |
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1117 } else if (n->is_Mach()) { |
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1118 // On Power there are more nodes that issue constants. |
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1119 add_size += (n->as_Mach()->ins_num_consts() * 8); |
2008 | 1120 } |
1121 } | |
1122 } | |
1123 | |
1124 // Calculate the offsets of the constants and the size of the | |
1125 // constant table (including the padding to the next section). | |
1126 constant_table().calculate_offsets_and_size(); | |
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1127 const_req = constant_table().size() + add_size; |
2008 | 1128 } |
1129 | |
1130 // Initialize the space for the BufferBlob used to find and verify | |
1131 // instruction size in MachNode::emit_size() | |
1132 init_scratch_buffer_blob(const_req); | |
3851 | 1133 if (failing()) return NULL; // Out of memory |
1134 | |
1135 // Pre-compute the length of blocks and replace | |
1136 // long branches with short if machine supports it. | |
1137 shorten_branches(blk_starts, code_req, locs_req, stub_req); | |
0 | 1138 |
1139 // nmethod and CodeBuffer count stubs & constants as part of method's code. | |
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1140 // class HandlerImpl is platform-specific and defined in the *.ad files. |
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1141 int exception_handler_req = HandlerImpl::size_exception_handler() + MAX_stubs_size; // add marginal slop for handler |
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1142 int deopt_handler_req = HandlerImpl::size_deopt_handler() + MAX_stubs_size; // add marginal slop for handler |
0 | 1143 stub_req += MAX_stubs_size; // ensure per-stub margin |
1144 code_req += MAX_inst_size; // ensure per-instruction margin | |
1265 | 1145 |
0 | 1146 if (StressCodeBuffers) |
1147 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion | |
1265 | 1148 |
1149 int total_req = | |
2008 | 1150 const_req + |
1265 | 1151 code_req + |
1152 pad_req + | |
1153 stub_req + | |
1154 exception_handler_req + | |
2008 | 1155 deopt_handler_req; // deopt handler |
1265 | 1156 |
1157 if (has_method_handle_invokes()) | |
1158 total_req += deopt_handler_req; // deopt MH handler | |
1159 | |
0 | 1160 CodeBuffer* cb = code_buffer(); |
1161 cb->initialize(total_req, locs_req); | |
1162 | |
1163 // Have we run out of code space? | |
1202 | 1164 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
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1165 C->record_failure("CodeCache is full"); |
3851 | 1166 return NULL; |
0 | 1167 } |
1168 // Configure the code buffer. | |
1169 cb->initialize_consts_size(const_req); | |
1170 cb->initialize_stubs_size(stub_req); | |
1171 cb->initialize_oop_recorder(env()->oop_recorder()); | |
1172 | |
1173 // fill in the nop array for bundling computations | |
1174 MachNode *_nop_list[Bundle::_nop_count]; | |
1175 Bundle::initialize_nops(_nop_list, this); | |
1176 | |
3851 | 1177 return cb; |
1178 } | |
1179 | |
1180 //------------------------------fill_buffer------------------------------------ | |
1181 void Compile::fill_buffer(CodeBuffer* cb, uint* blk_starts) { | |
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1182 // blk_starts[] contains offsets calculated during short branches processing, |
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1183 // offsets should not be increased during following steps. |
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1184 |
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1185 // Compute the size of first NumberOfLoopInstrToAlign instructions at head |
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1186 // of a loop. It is used to determine the padding for loop alignment. |
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1187 compute_loop_first_inst_sizes(); |
3851 | 1188 |
0 | 1189 // Create oopmap set. |
1190 _oop_map_set = new OopMapSet(); | |
1191 | |
1192 // !!!!! This preserves old handling of oopmaps for now | |
1193 debug_info()->set_oopmaps(_oop_map_set); | |
1194 | |
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1195 uint nblocks = _cfg->number_of_blocks(); |
0 | 1196 // Count and start of implicit null check instructions |
1197 uint inct_cnt = 0; | |
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1198 uint *inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1); |
0 | 1199 |
1200 // Count and start of calls | |
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1201 uint *call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1); |
0 | 1202 |
1203 uint return_offset = 0; | |
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1204 int nop_size = (new (this) MachNopNode())->size(_regalloc); |
0 | 1205 |
1206 int previous_offset = 0; | |
1207 int current_offset = 0; | |
1208 int last_call_offset = -1; | |
3851 | 1209 int last_avoid_back_to_back_offset = -1; |
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1210 #ifdef ASSERT |
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1211 uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1212 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1213 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1214 uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); |
3851 | 1215 #endif |
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1216 |
0 | 1217 // Create an array of unused labels, one for each basic block, if printing is enabled |
1218 #ifndef PRODUCT | |
1219 int *node_offsets = NULL; | |
3851 | 1220 uint node_offset_limit = unique(); |
1221 | |
1222 if (print_assembly()) | |
0 | 1223 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit); |
1224 #endif | |
1225 | |
1226 NonSafepointEmitter non_safepoints(this); // emit non-safepoints lazily | |
1227 | |
2008 | 1228 // Emit the constant table. |
1229 if (has_mach_constant_base_node()) { | |
1230 constant_table().emit(*cb); | |
1231 } | |
1232 | |
3851 | 1233 // Create an array of labels, one for each basic block |
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1234 Label *blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1); |
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1235 for (uint i=0; i <= nblocks; i++) { |
3851 | 1236 blk_labels[i].init(); |
1237 } | |
1238 | |
0 | 1239 // ------------------ |
1240 // Now fill in the code buffer | |
1241 Node *delay_slot = NULL; | |
1242 | |
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1243 for (uint i = 0; i < nblocks; i++) { |
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1244 Block* block = _cfg->get_block(i); |
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1245 Node* head = block->head(); |
0 | 1246 |
1247 // If this block needs to start aligned (i.e, can be reached other | |
1248 // than by falling-thru from the previous block), then force the | |
1249 // start of a new bundle. | |
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1250 if (Pipeline::requires_bundling() && starts_bundle(head)) { |
0 | 1251 cb->flush_bundle(true); |
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1252 } |
0 | 1253 |
3851 | 1254 #ifdef ASSERT |
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1255 if (!block->is_connector()) { |
3851 | 1256 stringStream st; |
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1257 block->dump_head(_cfg, &st); |
3851 | 1258 MacroAssembler(cb).block_comment(st.as_string()); |
1259 } | |
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1260 jmp_target[i] = 0; |
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1261 jmp_offset[i] = 0; |
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1262 jmp_size[i] = 0; |
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1263 jmp_rule[i] = 0; |
3851 | 1264 #endif |
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1265 int blk_offset = current_offset; |
3851 | 1266 |
0 | 1267 // Define the label at the beginning of the basic block |
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1268 MacroAssembler(cb).bind(blk_labels[block->_pre_order]); |
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1269 |
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1270 uint last_inst = block->number_of_nodes(); |
0 | 1271 |
1272 // Emit block normally, except for last instruction. | |
1273 // Emit means "dump code bits into code buffer". | |
3851 | 1274 for (uint j = 0; j<last_inst; j++) { |
0 | 1275 |
1276 // Get the node | |
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1277 Node* n = block->get_node(j); |
0 | 1278 |
1279 // See if delay slots are supported | |
1280 if (valid_bundle_info(n) && | |
1281 node_bundling(n)->used_in_unconditional_delay()) { | |
1282 assert(delay_slot == NULL, "no use of delay slot node"); | |
1283 assert(n->size(_regalloc) == Pipeline::instr_unit_size(), "delay slot instruction wrong size"); | |
1284 | |
1285 delay_slot = n; | |
1286 continue; | |
1287 } | |
1288 | |
1289 // If this starts a new instruction group, then flush the current one | |
1290 // (but allow split bundles) | |
3851 | 1291 if (Pipeline::requires_bundling() && starts_bundle(n)) |
0 | 1292 cb->flush_bundle(false); |
1293 | |
1294 // The following logic is duplicated in the code ifdeffed for | |
605 | 1295 // ENABLE_ZAP_DEAD_LOCALS which appears above in this file. It |
0 | 1296 // should be factored out. Or maybe dispersed to the nodes? |
1297 | |
1298 // Special handling for SafePoint/Call Nodes | |
1299 bool is_mcall = false; | |
3851 | 1300 if (n->is_Mach()) { |
0 | 1301 MachNode *mach = n->as_Mach(); |
1302 is_mcall = n->is_MachCall(); | |
1303 bool is_sfn = n->is_MachSafePoint(); | |
1304 | |
1305 // If this requires all previous instructions be flushed, then do so | |
3851 | 1306 if (is_sfn || is_mcall || mach->alignment_required() != 1) { |
0 | 1307 cb->flush_bundle(true); |
1748 | 1308 current_offset = cb->insts_size(); |
0 | 1309 } |
1310 | |
3851 | 1311 // A padding may be needed again since a previous instruction |
1312 // could be moved to delay slot. | |
1313 | |
0 | 1314 // align the instruction if necessary |
1315 int padding = mach->compute_padding(current_offset); | |
1316 // Make sure safepoint node for polling is distinct from a call's | |
1317 // return by adding a nop if needed. | |
3851 | 1318 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) { |
0 | 1319 padding = nop_size; |
1320 } | |
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1321 if (padding == 0 && mach->avoid_back_to_back(MachNode::AVOID_BEFORE) && |
3851 | 1322 current_offset == last_avoid_back_to_back_offset) { |
1323 // Avoid back to back some instructions. | |
1324 padding = nop_size; | |
0 | 1325 } |
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1326 |
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1327 if(padding > 0) { |
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1328 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); |
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1329 int nops_cnt = padding / nop_size; |
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1330 MachNode *nop = new (this) MachNopNode(nops_cnt); |
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1331 block->insert_node(nop, j++); |
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1332 last_inst++; |
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1333 _cfg->map_node_to_block(nop, block); |
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1334 nop->emit(*cb, _regalloc); |
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1335 cb->flush_bundle(true); |
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1336 current_offset = cb->insts_size(); |
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1337 } |
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1338 |
0 | 1339 // Remember the start of the last call in a basic block |
1340 if (is_mcall) { | |
1341 MachCallNode *mcall = mach->as_MachCall(); | |
1342 | |
1343 // This destination address is NOT PC-relative | |
1344 mcall->method_set((intptr_t)mcall->entry_point()); | |
1345 | |
1346 // Save the return address | |
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1347 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset(); |
0 | 1348 |
3842 | 1349 if (mcall->is_MachCallLeaf()) { |
0 | 1350 is_mcall = false; |
1351 is_sfn = false; | |
1352 } | |
1353 } | |
1354 | |
1355 // sfn will be valid whenever mcall is valid now because of inheritance | |
3851 | 1356 if (is_sfn || is_mcall) { |
0 | 1357 |
1358 // Handle special safepoint nodes for synchronization | |
3851 | 1359 if (!is_mcall) { |
0 | 1360 MachSafePointNode *sfn = mach->as_MachSafePoint(); |
1361 // !!!!! Stubs only need an oopmap right now, so bail out | |
3851 | 1362 if (sfn->jvms()->method() == NULL) { |
0 | 1363 // Write the oopmap directly to the code blob??!! |
1364 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
1365 assert( !is_node_getting_a_safepoint(sfn), "logic does not match; false positive"); | |
1366 # endif | |
1367 continue; | |
1368 } | |
1369 } // End synchronization | |
1370 | |
1371 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
1372 current_offset); | |
1373 Process_OopMap_Node(mach, current_offset); | |
1374 } // End if safepoint | |
1375 | |
1376 // If this is a null check, then add the start of the previous instruction to the list | |
1377 else if( mach->is_MachNullCheck() ) { | |
1378 inct_starts[inct_cnt++] = previous_offset; | |
1379 } | |
1380 | |
1381 // If this is a branch, then fill in the label with the target BB's label | |
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1382 else if (mach->is_MachBranch()) { |
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1383 // This requires the TRUE branch target be in succs[0] |
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1384 uint block_num = block->non_connector_successor(0)->_pre_order; |
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1385 |
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1386 // Try to replace long branch if delay slot is not used, |
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1387 // it is mostly for back branches since forward branch's |
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1388 // distance is not updated yet. |
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1389 bool delay_slot_is_used = valid_bundle_info(n) && |
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1390 node_bundling(n)->use_unconditional_delay(); |
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1391 if (!delay_slot_is_used && mach->may_be_short_branch()) { |
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1392 assert(delay_slot == NULL, "not expecting delay slot node"); |
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1393 int br_size = n->size(_regalloc); |
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1394 int offset = blk_starts[block_num] - current_offset; |
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1395 if (block_num >= i) { |
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1396 // Current and following block's offset are not |
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1397 // finalized yet, adjust distance by the difference |
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1398 // between calculated and final offsets of current block. |
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1399 offset -= (blk_starts[i] - blk_offset); |
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1400 } |
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1401 // In the following code a nop could be inserted before |
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1402 // the branch which will increase the backward distance. |
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1403 bool needs_padding = (current_offset == last_avoid_back_to_back_offset); |
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1404 if (needs_padding && offset <= 0) |
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1405 offset -= nop_size; |
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1406 |
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1407 if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) { |
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1408 // We've got a winner. Replace this branch. |
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1409 MachNode* replacement = mach->as_MachBranch()->short_branch_version(this); |
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1410 |
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1411 // Update the jmp_size. |
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1412 int new_size = replacement->size(_regalloc); |
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1413 assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller"); |
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1414 // Insert padding between avoid_back_to_back branches. |
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1415 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) { |
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1416 MachNode *nop = new (this) MachNopNode(); |
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1417 block->insert_node(nop, j++); |
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1418 _cfg->map_node_to_block(nop, block); |
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1419 last_inst++; |
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1420 nop->emit(*cb, _regalloc); |
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1421 cb->flush_bundle(true); |
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1422 current_offset = cb->insts_size(); |
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1423 } |
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1424 #ifdef ASSERT |
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1425 jmp_target[i] = block_num; |
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1426 jmp_offset[i] = current_offset - blk_offset; |
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1427 jmp_size[i] = new_size; |
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1428 jmp_rule[i] = mach->rule(); |
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1429 #endif |
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1430 block->map_node(replacement, j); |
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1431 mach->subsume_by(replacement, C); |
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1432 n = replacement; |
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1433 mach = replacement; |
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1434 } |
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1435 } |
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1436 mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num ); |
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1437 } else if (mach->ideal_Opcode() == Op_Jump) { |
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1438 for (uint h = 0; h < block->_num_succs; h++) { |
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1439 Block* succs_block = block->_succs[h]; |
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1440 for (uint j = 1; j < succs_block->num_preds(); j++) { |
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1441 Node* jpn = succs_block->pred(j); |
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1442 if (jpn->is_JumpProj() && jpn->in(0) == mach) { |
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1443 uint block_num = succs_block->non_connector()->_pre_order; |
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1444 Label *blkLabel = &blk_labels[block_num]; |
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1445 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel); |
0 | 1446 } |
1447 } | |
1448 } | |
1449 } | |
1450 #ifdef ASSERT | |
605 | 1451 // Check that oop-store precedes the card-mark |
3851 | 1452 else if (mach->ideal_Opcode() == Op_StoreCM) { |
0 | 1453 uint storeCM_idx = j; |
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1454 int count = 0; |
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1455 for (uint prec = mach->req(); prec < mach->len(); prec++) { |
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1456 Node *oop_store = mach->in(prec); // Precedence edge |
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1457 if (oop_store == NULL) continue; |
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1458 count++; |
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1459 uint i4; |
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1460 for (i4 = 0; i4 < last_inst; ++i4) { |
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1461 if (block->get_node(i4) == oop_store) { |
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1462 break; |
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1463 } |
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1464 } |
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1465 // Note: This test can provide a false failure if other precedence |
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1466 // edges have been added to the storeCMNode. |
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1467 assert(i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store"); |
0 | 1468 } |
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1469 assert(count > 0, "storeCM expects at least one precedence edge"); |
0 | 1470 } |
1471 #endif | |
3851 | 1472 else if (!n->is_Proj()) { |
605 | 1473 // Remember the beginning of the previous instruction, in case |
0 | 1474 // it's followed by a flag-kill and a null-check. Happens on |
1475 // Intel all the time, with add-to-memory kind of opcodes. | |
1476 previous_offset = current_offset; | |
1477 } | |
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1478 |
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1479 // Not an else-if! |
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1480 // If this is a trap based cmp then add its offset to the list. |
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1481 if (mach->is_TrapBasedCheckNode()) { |
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1482 inct_starts[inct_cnt++] = current_offset; |
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1483 } |
0 | 1484 } |
1485 | |
1486 // Verify that there is sufficient space remaining | |
1487 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size); | |
1202 | 1488 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
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1489 C->record_failure("CodeCache is full"); |
0 | 1490 return; |
1491 } | |
1492 | |
1493 // Save the offset for the listing | |
1494 #ifndef PRODUCT | |
3851 | 1495 if (node_offsets && n->_idx < node_offset_limit) |
1748 | 1496 node_offsets[n->_idx] = cb->insts_size(); |
0 | 1497 #endif |
1498 | |
1499 // "Normal" instruction case | |
3851 | 1500 DEBUG_ONLY( uint instr_offset = cb->insts_size(); ) |
0 | 1501 n->emit(*cb, _regalloc); |
1748 | 1502 current_offset = cb->insts_size(); |
3851 | 1503 |
1504 #ifdef ASSERT | |
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1505 if (n->size(_regalloc) < (current_offset-instr_offset)) { |
3851 | 1506 n->dump(); |
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1507 assert(false, "wrong size of mach node"); |
3851 | 1508 } |
1509 #endif | |
0 | 1510 non_safepoints.observe_instruction(n, current_offset); |
1511 | |
1512 // mcall is last "call" that can be a safepoint | |
1513 // record it so we can see if a poll will directly follow it | |
1514 // in which case we'll need a pad to make the PcDesc sites unique | |
1515 // see 5010568. This can be slightly inaccurate but conservative | |
1516 // in the case that return address is not actually at current_offset. | |
1517 // This is a small price to pay. | |
1518 | |
1519 if (is_mcall) { | |
1520 last_call_offset = current_offset; | |
1521 } | |
1522 | |
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1523 if (n->is_Mach() && n->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) { |
3851 | 1524 // Avoid back to back some instructions. |
1525 last_avoid_back_to_back_offset = current_offset; | |
1526 } | |
1527 | |
0 | 1528 // See if this instruction has a delay slot |
3851 | 1529 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { |
0 | 1530 assert(delay_slot != NULL, "expecting delay slot node"); |
1531 | |
1532 // Back up 1 instruction | |
1748 | 1533 cb->set_insts_end(cb->insts_end() - Pipeline::instr_unit_size()); |
0 | 1534 |
1535 // Save the offset for the listing | |
1536 #ifndef PRODUCT | |
3851 | 1537 if (node_offsets && delay_slot->_idx < node_offset_limit) |
1748 | 1538 node_offsets[delay_slot->_idx] = cb->insts_size(); |
0 | 1539 #endif |
1540 | |
1541 // Support a SafePoint in the delay slot | |
3851 | 1542 if (delay_slot->is_MachSafePoint()) { |
0 | 1543 MachNode *mach = delay_slot->as_Mach(); |
1544 // !!!!! Stubs only need an oopmap right now, so bail out | |
3851 | 1545 if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL) { |
0 | 1546 // Write the oopmap directly to the code blob??!! |
1547 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
1548 assert( !is_node_getting_a_safepoint(mach), "logic does not match; false positive"); | |
1549 # endif | |
1550 delay_slot = NULL; | |
1551 continue; | |
1552 } | |
1553 | |
1554 int adjusted_offset = current_offset - Pipeline::instr_unit_size(); | |
1555 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
1556 adjusted_offset); | |
1557 // Generate an OopMap entry | |
1558 Process_OopMap_Node(mach, adjusted_offset); | |
1559 } | |
1560 | |
1561 // Insert the delay slot instruction | |
1562 delay_slot->emit(*cb, _regalloc); | |
1563 | |
1564 // Don't reuse it | |
1565 delay_slot = NULL; | |
1566 } | |
1567 | |
1568 } // End for all instructions in block | |
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1569 |
418 | 1570 // If the next block is the top of a loop, pad this block out to align |
1571 // the loop top a little. Helps prevent pipe stalls at loop back branches. | |
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1572 if (i < nblocks-1) { |
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1573 Block *nb = _cfg->get_block(i + 1); |
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1574 int padding = nb->alignment_padding(current_offset); |
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1575 if( padding > 0 ) { |
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1576 MachNode *nop = new (this) MachNopNode(padding / nop_size); |
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1577 block->insert_node(nop, block->number_of_nodes()); |
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1578 _cfg->map_node_to_block(nop, block); |
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1579 nop->emit(*cb, _regalloc); |
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1580 current_offset = cb->insts_size(); |
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1581 } |
0 | 1582 } |
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1583 // Verify that the distance for generated before forward |
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1584 // short branches is still valid. |
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1585 guarantee((int)(blk_starts[i+1] - blk_starts[i]) >= (current_offset - blk_offset), "shouldn't increase block size"); |
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1586 |
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1587 // Save new block start offset |
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1588 blk_starts[i] = blk_offset; |
0 | 1589 } // End of for all blocks |
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1590 blk_starts[nblocks] = current_offset; |
0 | 1591 |
1592 non_safepoints.flush_at_end(); | |
1593 | |
1594 // Offset too large? | |
1595 if (failing()) return; | |
1596 | |
1597 // Define a pseudo-label at the end of the code | |
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1598 MacroAssembler(cb).bind( blk_labels[nblocks] ); |
0 | 1599 |
1600 // Compute the size of the first block | |
1601 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos(); | |
1602 | |
1748 | 1603 assert(cb->insts_size() < 500000, "method is unreasonably large"); |
0 | 1604 |
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1605 #ifdef ASSERT |
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1606 for (uint i = 0; i < nblocks; i++) { // For all blocks |
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1607 if (jmp_target[i] != 0) { |
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1608 int br_size = jmp_size[i]; |
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1609 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]); |
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1610 if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) { |
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1611 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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1612 assert(false, "Displacement too large for short jmp"); |
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1613 } |
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1614 } |
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1615 } |
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1616 #endif |
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1617 |
0 | 1618 #ifndef PRODUCT |
1619 // Information on the size of the method, without the extraneous code | |
1748 | 1620 Scheduling::increment_method_size(cb->insts_size()); |
0 | 1621 #endif |
1622 | |
1623 // ------------------ | |
1624 // Fill in exception table entries. | |
1625 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels); | |
1626 | |
1627 // Only java methods have exception handlers and deopt handlers | |
17809
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1628 // class HandlerImpl is platform-specific and defined in the *.ad files. |
0 | 1629 if (_method) { |
1630 // Emit the exception handler code. | |
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1631 _code_offsets.set_value(CodeOffsets::Exceptions, HandlerImpl::emit_exception_handler(*cb)); |
0 | 1632 // Emit the deopt handler code. |
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1633 _code_offsets.set_value(CodeOffsets::Deopt, HandlerImpl::emit_deopt_handler(*cb)); |
1265 | 1634 |
1635 // Emit the MethodHandle deopt handler code (if required). | |
1636 if (has_method_handle_invokes()) { | |
1637 // We can use the same code as for the normal deopt handler, we | |
1638 // just need a different entry point address. | |
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1639 _code_offsets.set_value(CodeOffsets::DeoptMH, HandlerImpl::emit_deopt_handler(*cb)); |
1265 | 1640 } |
0 | 1641 } |
1642 | |
1643 // One last check for failed CodeBuffer::expand: | |
1202 | 1644 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
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1645 C->record_failure("CodeCache is full"); |
0 | 1646 return; |
1647 } | |
1648 | |
1649 #ifndef PRODUCT | |
1650 // Dump the assembly code, including basic-block numbers | |
1651 if (print_assembly()) { | |
1652 ttyLocker ttyl; // keep the following output all in one block | |
1653 if (!VMThread::should_terminate()) { // test this under the tty lock | |
1654 // This output goes directly to the tty, not the compiler log. | |
1655 // To enable tools to match it up with the compilation activity, | |
1656 // be sure to tag this tty output with the compile ID. | |
1657 if (xtty != NULL) { | |
1658 xtty->head("opto_assembly compile_id='%d'%s", compile_id(), | |
1659 is_osr_compilation() ? " compile_kind='osr'" : | |
1660 ""); | |
1661 } | |
1662 if (method() != NULL) { | |
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1663 method()->print_metadata(); |
0 | 1664 } |
1665 dump_asm(node_offsets, node_offset_limit); | |
1666 if (xtty != NULL) { | |
1667 xtty->tail("opto_assembly"); | |
1668 } | |
1669 } | |
1670 } | |
1671 #endif | |
1672 | |
1673 } | |
1674 | |
1675 void Compile::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) { | |
1676 _inc_table.set_size(cnt); | |
1677 | |
1678 uint inct_cnt = 0; | |
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1679 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
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1680 Block* block = _cfg->get_block(i); |
0 | 1681 Node *n = NULL; |
1682 int j; | |
1683 | |
1684 // Find the branch; ignore trailing NOPs. | |
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1685 for (j = block->number_of_nodes() - 1; j >= 0; j--) { |
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1686 n = block->get_node(j); |
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1687 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) { |
0 | 1688 break; |
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1689 } |
0 | 1690 } |
1691 | |
1692 // If we didn't find anything, continue | |
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1693 if (j < 0) { |
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1694 continue; |
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1695 } |
0 | 1696 |
1697 // Compute ExceptionHandlerTable subtable entry and add it | |
1698 // (skip empty blocks) | |
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1699 if (n->is_Catch()) { |
0 | 1700 |
1701 // Get the offset of the return from the call | |
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1702 uint call_return = call_returns[block->_pre_order]; |
0 | 1703 #ifdef ASSERT |
1704 assert( call_return > 0, "no call seen for this basic block" ); | |
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1705 while (block->get_node(--j)->is_MachProj()) ; |
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1706 assert(block->get_node(j)->is_MachCall(), "CatchProj must follow call"); |
0 | 1707 #endif |
1708 // last instruction is a CatchNode, find it's CatchProjNodes | |
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1709 int nof_succs = block->_num_succs; |
0 | 1710 // allocate space |
1711 GrowableArray<intptr_t> handler_bcis(nof_succs); | |
1712 GrowableArray<intptr_t> handler_pcos(nof_succs); | |
1713 // iterate through all successors | |
1714 for (int j = 0; j < nof_succs; j++) { | |
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1715 Block* s = block->_succs[j]; |
0 | 1716 bool found_p = false; |
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1717 for (uint k = 1; k < s->num_preds(); k++) { |
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1718 Node* pk = s->pred(k); |
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1719 if (pk->is_CatchProj() && pk->in(0) == n) { |
0 | 1720 const CatchProjNode* p = pk->as_CatchProj(); |
1721 found_p = true; | |
1722 // add the corresponding handler bci & pco information | |
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1723 if (p->_con != CatchProjNode::fall_through_index) { |
0 | 1724 // p leads to an exception handler (and is not fall through) |
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1725 assert(s == _cfg->get_block(s->_pre_order), "bad numbering"); |
0 | 1726 // no duplicates, please |
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1727 if (!handler_bcis.contains(p->handler_bci())) { |
0 | 1728 uint block_num = s->non_connector()->_pre_order; |
1729 handler_bcis.append(p->handler_bci()); | |
1730 handler_pcos.append(blk_labels[block_num].loc_pos()); | |
1731 } | |
1732 } | |
1733 } | |
1734 } | |
1735 assert(found_p, "no matching predecessor found"); | |
1736 // Note: Due to empty block removal, one block may have | |
1737 // several CatchProj inputs, from the same Catch. | |
1738 } | |
1739 | |
1740 // Set the offset of the return from the call | |
1741 _handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos); | |
1742 continue; | |
1743 } | |
1744 | |
1745 // Handle implicit null exception table updates | |
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1746 if (n->is_MachNullCheck()) { |
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1747 uint block_num = block->non_connector_successor(0)->_pre_order; |
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1748 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos()); |
0 | 1749 continue; |
1750 } | |
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1751 // Handle implicit exception table updates: trap instructions. |
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1752 if (n->is_Mach() && n->as_Mach()->is_TrapBasedCheckNode()) { |
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1753 uint block_num = block->non_connector_successor(0)->_pre_order; |
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1754 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos()); |
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1755 continue; |
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1756 } |
0 | 1757 } // End of for all blocks fill in exception table entries |
1758 } | |
1759 | |
1760 // Static Variables | |
1761 #ifndef PRODUCT | |
1762 uint Scheduling::_total_nop_size = 0; | |
1763 uint Scheduling::_total_method_size = 0; | |
1764 uint Scheduling::_total_branches = 0; | |
1765 uint Scheduling::_total_unconditional_delays = 0; | |
1766 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1]; | |
1767 #endif | |
1768 | |
1769 // Initializer for class Scheduling | |
1770 | |
1771 Scheduling::Scheduling(Arena *arena, Compile &compile) | |
1772 : _arena(arena), | |
1773 _cfg(compile.cfg()), | |
1774 _regalloc(compile.regalloc()), | |
1775 _reg_node(arena), | |
1776 _bundle_instr_count(0), | |
1777 _bundle_cycle_number(0), | |
1778 _scheduled(arena), | |
1779 _available(arena), | |
1780 _next_node(NULL), | |
1781 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0]), | |
1782 _pinch_free_list(arena) | |
1783 #ifndef PRODUCT | |
1784 , _branches(0) | |
1785 , _unconditional_delays(0) | |
1786 #endif | |
1787 { | |
1788 // Create a MachNopNode | |
1789 _nop = new (&compile) MachNopNode(); | |
1790 | |
1791 // Now that the nops are in the array, save the count | |
1792 // (but allow entries for the nops) | |
1793 _node_bundling_limit = compile.unique(); | |
1794 uint node_max = _regalloc->node_regs_max_index(); | |
1795 | |
1796 compile.set_node_bundling_limit(_node_bundling_limit); | |
1797 | |
605 | 1798 // This one is persistent within the Compile class |
0 | 1799 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max); |
1800 | |
1801 // Allocate space for fixed-size arrays | |
1802 _node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
1803 _uses = NEW_ARENA_ARRAY(arena, short, node_max); | |
1804 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
1805 | |
1806 // Clear the arrays | |
1807 memset(_node_bundling_base, 0, node_max * sizeof(Bundle)); | |
1808 memset(_node_latency, 0, node_max * sizeof(unsigned short)); | |
1809 memset(_uses, 0, node_max * sizeof(short)); | |
1810 memset(_current_latency, 0, node_max * sizeof(unsigned short)); | |
1811 | |
1812 // Clear the bundling information | |
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1813 memcpy(_bundle_use_elements, Pipeline_Use::elaborated_elements, sizeof(Pipeline_Use::elaborated_elements)); |
0 | 1814 |
1815 // Get the last node | |
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1816 Block* block = _cfg->get_block(_cfg->number_of_blocks() - 1); |
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1817 |
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1818 _next_node = block->get_node(block->number_of_nodes() - 1); |
0 | 1819 } |
1820 | |
1821 #ifndef PRODUCT | |
1822 // Scheduling destructor | |
1823 Scheduling::~Scheduling() { | |
1824 _total_branches += _branches; | |
1825 _total_unconditional_delays += _unconditional_delays; | |
1826 } | |
1827 #endif | |
1828 | |
1829 // Step ahead "i" cycles | |
1830 void Scheduling::step(uint i) { | |
1831 | |
1832 Bundle *bundle = node_bundling(_next_node); | |
1833 bundle->set_starts_bundle(); | |
1834 | |
1835 // Update the bundle record, but leave the flags information alone | |
1836 if (_bundle_instr_count > 0) { | |
1837 bundle->set_instr_count(_bundle_instr_count); | |
1838 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
1839 } | |
1840 | |
1841 // Update the state information | |
1842 _bundle_instr_count = 0; | |
1843 _bundle_cycle_number += i; | |
1844 _bundle_use.step(i); | |
1845 } | |
1846 | |
1847 void Scheduling::step_and_clear() { | |
1848 Bundle *bundle = node_bundling(_next_node); | |
1849 bundle->set_starts_bundle(); | |
1850 | |
1851 // Update the bundle record | |
1852 if (_bundle_instr_count > 0) { | |
1853 bundle->set_instr_count(_bundle_instr_count); | |
1854 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
1855 | |
1856 _bundle_cycle_number += 1; | |
1857 } | |
1858 | |
1859 // Clear the bundling information | |
1860 _bundle_instr_count = 0; | |
1861 _bundle_use.reset(); | |
1862 | |
1863 memcpy(_bundle_use_elements, | |
1864 Pipeline_Use::elaborated_elements, | |
1865 sizeof(Pipeline_Use::elaborated_elements)); | |
1866 } | |
1867 | |
1868 // Perform instruction scheduling and bundling over the sequence of | |
1869 // instructions in backwards order. | |
1870 void Compile::ScheduleAndBundle() { | |
1871 | |
1872 // Don't optimize this if it isn't a method | |
1873 if (!_method) | |
1874 return; | |
1875 | |
1876 // Don't optimize this if scheduling is disabled | |
1877 if (!do_scheduling()) | |
1878 return; | |
1879 | |
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1880 // Scheduling code works only with pairs (8 bytes) maximum. |
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1881 if (max_vector_size() > 8) |
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1882 return; |
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1883 |
0 | 1884 NOT_PRODUCT( TracePhase t2("isched", &_t_instrSched, TimeCompiler); ) |
1885 | |
1886 // Create a data structure for all the scheduling information | |
1887 Scheduling scheduling(Thread::current()->resource_area(), *this); | |
1888 | |
1889 // Walk backwards over each basic block, computing the needed alignment | |
1890 // Walk over all the basic blocks | |
1891 scheduling.DoScheduling(); | |
1892 } | |
1893 | |
1894 // Compute the latency of all the instructions. This is fairly simple, | |
1895 // because we already have a legal ordering. Walk over the instructions | |
1896 // from first to last, and compute the latency of the instruction based | |
605 | 1897 // on the latency of the preceding instruction(s). |
0 | 1898 void Scheduling::ComputeLocalLatenciesForward(const Block *bb) { |
1899 #ifndef PRODUCT | |
1900 if (_cfg->C->trace_opto_output()) | |
1901 tty->print("# -> ComputeLocalLatenciesForward\n"); | |
1902 #endif | |
1903 | |
1904 // Walk over all the schedulable instructions | |
1905 for( uint j=_bb_start; j < _bb_end; j++ ) { | |
1906 | |
1907 // This is a kludge, forcing all latency calculations to start at 1. | |
1908 // Used to allow latency 0 to force an instruction to the beginning | |
1909 // of the bb | |
1910 uint latency = 1; | |
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1911 Node *use = bb->get_node(j); |
0 | 1912 uint nlen = use->len(); |
1913 | |
1914 // Walk over all the inputs | |
1915 for ( uint k=0; k < nlen; k++ ) { | |
1916 Node *def = use->in(k); | |
1917 if (!def) | |
1918 continue; | |
1919 | |
1920 uint l = _node_latency[def->_idx] + use->latency(k); | |
1921 if (latency < l) | |
1922 latency = l; | |
1923 } | |
1924 | |
1925 _node_latency[use->_idx] = latency; | |
1926 | |
1927 #ifndef PRODUCT | |
1928 if (_cfg->C->trace_opto_output()) { | |
1929 tty->print("# latency %4d: ", latency); | |
1930 use->dump(); | |
1931 } | |
1932 #endif | |
1933 } | |
1934 | |
1935 #ifndef PRODUCT | |
1936 if (_cfg->C->trace_opto_output()) | |
1937 tty->print("# <- ComputeLocalLatenciesForward\n"); | |
1938 #endif | |
1939 | |
1940 } // end ComputeLocalLatenciesForward | |
1941 | |
1942 // See if this node fits into the present instruction bundle | |
1943 bool Scheduling::NodeFitsInBundle(Node *n) { | |
1944 uint n_idx = n->_idx; | |
1945 | |
1946 // If this is the unconditional delay instruction, then it fits | |
1947 if (n == _unconditional_delay_slot) { | |
1948 #ifndef PRODUCT | |
1949 if (_cfg->C->trace_opto_output()) | |
1950 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx); | |
1951 #endif | |
1952 return (true); | |
1953 } | |
1954 | |
1955 // If the node cannot be scheduled this cycle, skip it | |
1956 if (_current_latency[n_idx] > _bundle_cycle_number) { | |
1957 #ifndef PRODUCT | |
1958 if (_cfg->C->trace_opto_output()) | |
1959 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n", | |
1960 n->_idx, _current_latency[n_idx], _bundle_cycle_number); | |
1961 #endif | |
1962 return (false); | |
1963 } | |
1964 | |
1965 const Pipeline *node_pipeline = n->pipeline(); | |
1966 | |
1967 uint instruction_count = node_pipeline->instructionCount(); | |
1968 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
1969 instruction_count = 0; | |
1970 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
1971 instruction_count++; | |
1972 | |
1973 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) { | |
1974 #ifndef PRODUCT | |
1975 if (_cfg->C->trace_opto_output()) | |
1976 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n", | |
1977 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle); | |
1978 #endif | |
1979 return (false); | |
1980 } | |
1981 | |
1982 // Don't allow non-machine nodes to be handled this way | |
1983 if (!n->is_Mach() && instruction_count == 0) | |
1984 return (false); | |
1985 | |
1986 // See if there is any overlap | |
1987 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse()); | |
1988 | |
1989 if (delay > 0) { | |
1990 #ifndef PRODUCT | |
1991 if (_cfg->C->trace_opto_output()) | |
1992 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx); | |
1993 #endif | |
1994 return false; | |
1995 } | |
1996 | |
1997 #ifndef PRODUCT | |
1998 if (_cfg->C->trace_opto_output()) | |
1999 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx); | |
2000 #endif | |
2001 | |
2002 return true; | |
2003 } | |
2004 | |
2005 Node * Scheduling::ChooseNodeToBundle() { | |
2006 uint siz = _available.size(); | |
2007 | |
2008 if (siz == 0) { | |
2009 | |
2010 #ifndef PRODUCT | |
2011 if (_cfg->C->trace_opto_output()) | |
2012 tty->print("# ChooseNodeToBundle: NULL\n"); | |
2013 #endif | |
2014 return (NULL); | |
2015 } | |
2016 | |
2017 // Fast path, if only 1 instruction in the bundle | |
2018 if (siz == 1) { | |
2019 #ifndef PRODUCT | |
2020 if (_cfg->C->trace_opto_output()) { | |
2021 tty->print("# ChooseNodeToBundle (only 1): "); | |
2022 _available[0]->dump(); | |
2023 } | |
2024 #endif | |
2025 return (_available[0]); | |
2026 } | |
2027 | |
2028 // Don't bother, if the bundle is already full | |
2029 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) { | |
2030 for ( uint i = 0; i < siz; i++ ) { | |
2031 Node *n = _available[i]; | |
2032 | |
2033 // Skip projections, we'll handle them another way | |
2034 if (n->is_Proj()) | |
2035 continue; | |
2036 | |
2037 // This presupposed that instructions are inserted into the | |
2038 // available list in a legality order; i.e. instructions that | |
2039 // must be inserted first are at the head of the list | |
2040 if (NodeFitsInBundle(n)) { | |
2041 #ifndef PRODUCT | |
2042 if (_cfg->C->trace_opto_output()) { | |
2043 tty->print("# ChooseNodeToBundle: "); | |
2044 n->dump(); | |
2045 } | |
2046 #endif | |
2047 return (n); | |
2048 } | |
2049 } | |
2050 } | |
2051 | |
2052 // Nothing fits in this bundle, choose the highest priority | |
2053 #ifndef PRODUCT | |
2054 if (_cfg->C->trace_opto_output()) { | |
2055 tty->print("# ChooseNodeToBundle: "); | |
2056 _available[0]->dump(); | |
2057 } | |
2058 #endif | |
2059 | |
2060 return _available[0]; | |
2061 } | |
2062 | |
2063 void Scheduling::AddNodeToAvailableList(Node *n) { | |
2064 assert( !n->is_Proj(), "projections never directly made available" ); | |
2065 #ifndef PRODUCT | |
2066 if (_cfg->C->trace_opto_output()) { | |
2067 tty->print("# AddNodeToAvailableList: "); | |
2068 n->dump(); | |
2069 } | |
2070 #endif | |
2071 | |
2072 int latency = _current_latency[n->_idx]; | |
2073 | |
2074 // Insert in latency order (insertion sort) | |
2075 uint i; | |
2076 for ( i=0; i < _available.size(); i++ ) | |
2077 if (_current_latency[_available[i]->_idx] > latency) | |
2078 break; | |
2079 | |
2080 // Special Check for compares following branches | |
2081 if( n->is_Mach() && _scheduled.size() > 0 ) { | |
2082 int op = n->as_Mach()->ideal_Opcode(); | |
2083 Node *last = _scheduled[0]; | |
2084 if( last->is_MachIf() && last->in(1) == n && | |
2085 ( op == Op_CmpI || | |
2086 op == Op_CmpU || | |
2087 op == Op_CmpP || | |
2088 op == Op_CmpF || | |
2089 op == Op_CmpD || | |
2090 op == Op_CmpL ) ) { | |
2091 | |
2092 // Recalculate position, moving to front of same latency | |
2093 for ( i=0 ; i < _available.size(); i++ ) | |
2094 if (_current_latency[_available[i]->_idx] >= latency) | |
2095 break; | |
2096 } | |
2097 } | |
2098 | |
2099 // Insert the node in the available list | |
2100 _available.insert(i, n); | |
2101 | |
2102 #ifndef PRODUCT | |
2103 if (_cfg->C->trace_opto_output()) | |
2104 dump_available(); | |
2105 #endif | |
2106 } | |
2107 | |
2108 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) { | |
2109 for ( uint i=0; i < n->len(); i++ ) { | |
2110 Node *def = n->in(i); | |
2111 if (!def) continue; | |
2112 if( def->is_Proj() ) // If this is a machine projection, then | |
2113 def = def->in(0); // propagate usage thru to the base instruction | |
2114 | |
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2115 if(_cfg->get_block_for_node(def) != bb) { // Ignore if not block-local |
0 | 2116 continue; |
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2117 } |
0 | 2118 |
2119 // Compute the latency | |
2120 uint l = _bundle_cycle_number + n->latency(i); | |
2121 if (_current_latency[def->_idx] < l) | |
2122 _current_latency[def->_idx] = l; | |
2123 | |
2124 // If this does not have uses then schedule it | |
2125 if ((--_uses[def->_idx]) == 0) | |
2126 AddNodeToAvailableList(def); | |
2127 } | |
2128 } | |
2129 | |
2130 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) { | |
2131 #ifndef PRODUCT | |
2132 if (_cfg->C->trace_opto_output()) { | |
2133 tty->print("# AddNodeToBundle: "); | |
2134 n->dump(); | |
2135 } | |
2136 #endif | |
2137 | |
2138 // Remove this from the available list | |
2139 uint i; | |
2140 for (i = 0; i < _available.size(); i++) | |
2141 if (_available[i] == n) | |
2142 break; | |
2143 assert(i < _available.size(), "entry in _available list not found"); | |
2144 _available.remove(i); | |
2145 | |
2146 // See if this fits in the current bundle | |
2147 const Pipeline *node_pipeline = n->pipeline(); | |
2148 const Pipeline_Use& node_usage = node_pipeline->resourceUse(); | |
2149 | |
2150 // Check for instructions to be placed in the delay slot. We | |
2151 // do this before we actually schedule the current instruction, | |
2152 // because the delay slot follows the current instruction. | |
2153 if (Pipeline::_branch_has_delay_slot && | |
2154 node_pipeline->hasBranchDelay() && | |
2155 !_unconditional_delay_slot) { | |
2156 | |
2157 uint siz = _available.size(); | |
2158 | |
2159 // Conditional branches can support an instruction that | |
605 | 2160 // is unconditionally executed and not dependent by the |
0 | 2161 // branch, OR a conditionally executed instruction if |
2162 // the branch is taken. In practice, this means that | |
2163 // the first instruction at the branch target is | |
2164 // copied to the delay slot, and the branch goes to | |
2165 // the instruction after that at the branch target | |
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2166 if ( n->is_MachBranch() ) { |
0 | 2167 |
2168 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" ); | |
2169 assert( !n->is_Catch(), "should not look for delay slot for Catch" ); | |
2170 | |
2171 #ifndef PRODUCT | |
2172 _branches++; | |
2173 #endif | |
2174 | |
2175 // At least 1 instruction is on the available list | |
605 | 2176 // that is not dependent on the branch |
0 | 2177 for (uint i = 0; i < siz; i++) { |
2178 Node *d = _available[i]; | |
2179 const Pipeline *avail_pipeline = d->pipeline(); | |
2180 | |
2181 // Don't allow safepoints in the branch shadow, that will | |
2182 // cause a number of difficulties | |
2183 if ( avail_pipeline->instructionCount() == 1 && | |
2184 !avail_pipeline->hasMultipleBundles() && | |
2185 !avail_pipeline->hasBranchDelay() && | |
2186 Pipeline::instr_has_unit_size() && | |
2187 d->size(_regalloc) == Pipeline::instr_unit_size() && | |
2188 NodeFitsInBundle(d) && | |
2189 !node_bundling(d)->used_in_delay()) { | |
2190 | |
2191 if (d->is_Mach() && !d->is_MachSafePoint()) { | |
2192 // A node that fits in the delay slot was found, so we need to | |
2193 // set the appropriate bits in the bundle pipeline information so | |
2194 // that it correctly indicates resource usage. Later, when we | |
2195 // attempt to add this instruction to the bundle, we will skip | |
2196 // setting the resource usage. | |
2197 _unconditional_delay_slot = d; | |
2198 node_bundling(n)->set_use_unconditional_delay(); | |
2199 node_bundling(d)->set_used_in_unconditional_delay(); | |
2200 _bundle_use.add_usage(avail_pipeline->resourceUse()); | |
2201 _current_latency[d->_idx] = _bundle_cycle_number; | |
2202 _next_node = d; | |
2203 ++_bundle_instr_count; | |
2204 #ifndef PRODUCT | |
2205 _unconditional_delays++; | |
2206 #endif | |
2207 break; | |
2208 } | |
2209 } | |
2210 } | |
2211 } | |
2212 | |
2213 // No delay slot, add a nop to the usage | |
2214 if (!_unconditional_delay_slot) { | |
2215 // See if adding an instruction in the delay slot will overflow | |
2216 // the bundle. | |
2217 if (!NodeFitsInBundle(_nop)) { | |
2218 #ifndef PRODUCT | |
2219 if (_cfg->C->trace_opto_output()) | |
2220 tty->print("# *** STEP(1 instruction for delay slot) ***\n"); | |
2221 #endif | |
2222 step(1); | |
2223 } | |
2224 | |
2225 _bundle_use.add_usage(_nop->pipeline()->resourceUse()); | |
2226 _next_node = _nop; | |
2227 ++_bundle_instr_count; | |
2228 } | |
2229 | |
2230 // See if the instruction in the delay slot requires a | |
2231 // step of the bundles | |
2232 if (!NodeFitsInBundle(n)) { | |
2233 #ifndef PRODUCT | |
2234 if (_cfg->C->trace_opto_output()) | |
2235 tty->print("# *** STEP(branch won't fit) ***\n"); | |
2236 #endif | |
2237 // Update the state information | |
2238 _bundle_instr_count = 0; | |
2239 _bundle_cycle_number += 1; | |
2240 _bundle_use.step(1); | |
2241 } | |
2242 } | |
2243 | |
2244 // Get the number of instructions | |
2245 uint instruction_count = node_pipeline->instructionCount(); | |
2246 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
2247 instruction_count = 0; | |
2248 | |
2249 // Compute the latency information | |
2250 uint delay = 0; | |
2251 | |
2252 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) { | |
2253 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number; | |
2254 if (relative_latency < 0) | |
2255 relative_latency = 0; | |
2256 | |
2257 delay = _bundle_use.full_latency(relative_latency, node_usage); | |
2258 | |
2259 // Does not fit in this bundle, start a new one | |
2260 if (delay > 0) { | |
2261 step(delay); | |
2262 | |
2263 #ifndef PRODUCT | |
2264 if (_cfg->C->trace_opto_output()) | |
2265 tty->print("# *** STEP(%d) ***\n", delay); | |
2266 #endif | |
2267 } | |
2268 } | |
2269 | |
2270 // If this was placed in the delay slot, ignore it | |
2271 if (n != _unconditional_delay_slot) { | |
2272 | |
2273 if (delay == 0) { | |
2274 if (node_pipeline->hasMultipleBundles()) { | |
2275 #ifndef PRODUCT | |
2276 if (_cfg->C->trace_opto_output()) | |
2277 tty->print("# *** STEP(multiple instructions) ***\n"); | |
2278 #endif | |
2279 step(1); | |
2280 } | |
2281 | |
2282 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) { | |
2283 #ifndef PRODUCT | |
2284 if (_cfg->C->trace_opto_output()) | |
2285 tty->print("# *** STEP(%d >= %d instructions) ***\n", | |
2286 instruction_count + _bundle_instr_count, | |
2287 Pipeline::_max_instrs_per_cycle); | |
2288 #endif | |
2289 step(1); | |
2290 } | |
2291 } | |
2292 | |
2293 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
2294 _bundle_instr_count++; | |
2295 | |
2296 // Set the node's latency | |
2297 _current_latency[n->_idx] = _bundle_cycle_number; | |
2298 | |
2299 // Now merge the functional unit information | |
2300 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) | |
2301 _bundle_use.add_usage(node_usage); | |
2302 | |
2303 // Increment the number of instructions in this bundle | |
2304 _bundle_instr_count += instruction_count; | |
2305 | |
2306 // Remember this node for later | |
2307 if (n->is_Mach()) | |
2308 _next_node = n; | |
2309 } | |
2310 | |
2311 // It's possible to have a BoxLock in the graph and in the _bbs mapping but | |
2312 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks. | |
2313 // 'Schedule' them (basically ignore in the schedule) but do not insert them | |
2314 // into the block. All other scheduled nodes get put in the schedule here. | |
2315 int op = n->Opcode(); | |
2316 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR | |
2317 (op != Op_Node && // Not an unused antidepedence node and | |
2318 // not an unallocated boxlock | |
2319 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) { | |
2320 | |
2321 // Push any trailing projections | |
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2322 if( bb->get_node(bb->number_of_nodes()-1) != n ) { |
0 | 2323 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
2324 Node *foi = n->fast_out(i); | |
2325 if( foi->is_Proj() ) | |
2326 _scheduled.push(foi); | |
2327 } | |
2328 } | |
2329 | |
2330 // Put the instruction in the schedule list | |
2331 _scheduled.push(n); | |
2332 } | |
2333 | |
2334 #ifndef PRODUCT | |
2335 if (_cfg->C->trace_opto_output()) | |
2336 dump_available(); | |
2337 #endif | |
2338 | |
2339 // Walk all the definitions, decrementing use counts, and | |
2340 // if a definition has a 0 use count, place it in the available list. | |
2341 DecrementUseCounts(n,bb); | |
2342 } | |
2343 | |
2344 // This method sets the use count within a basic block. We will ignore all | |
2345 // uses outside the current basic block. As we are doing a backwards walk, | |
2346 // any node we reach that has a use count of 0 may be scheduled. This also | |
2347 // avoids the problem of cyclic references from phi nodes, as long as phi | |
2348 // nodes are at the front of the basic block. This method also initializes | |
2349 // the available list to the set of instructions that have no uses within this | |
2350 // basic block. | |
2351 void Scheduling::ComputeUseCount(const Block *bb) { | |
2352 #ifndef PRODUCT | |
2353 if (_cfg->C->trace_opto_output()) | |
2354 tty->print("# -> ComputeUseCount\n"); | |
2355 #endif | |
2356 | |
2357 // Clear the list of available and scheduled instructions, just in case | |
2358 _available.clear(); | |
2359 _scheduled.clear(); | |
2360 | |
2361 // No delay slot specified | |
2362 _unconditional_delay_slot = NULL; | |
2363 | |
2364 #ifdef ASSERT | |
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2365 for( uint i=0; i < bb->number_of_nodes(); i++ ) |
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2366 assert( _uses[bb->get_node(i)->_idx] == 0, "_use array not clean" ); |
0 | 2367 #endif |
2368 | |
2369 // Force the _uses count to never go to zero for unscheduable pieces | |
2370 // of the block | |
2371 for( uint k = 0; k < _bb_start; k++ ) | |
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2372 _uses[bb->get_node(k)->_idx] = 1; |
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2373 for( uint l = _bb_end; l < bb->number_of_nodes(); l++ ) |
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2374 _uses[bb->get_node(l)->_idx] = 1; |
0 | 2375 |
2376 // Iterate backwards over the instructions in the block. Don't count the | |
2377 // branch projections at end or the block header instructions. | |
2378 for( uint j = _bb_end-1; j >= _bb_start; j-- ) { | |
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2379 Node *n = bb->get_node(j); |
0 | 2380 if( n->is_Proj() ) continue; // Projections handled another way |
2381 | |
2382 // Account for all uses | |
2383 for ( uint k = 0; k < n->len(); k++ ) { | |
2384 Node *inp = n->in(k); | |
2385 if (!inp) continue; | |
2386 assert(inp != n, "no cycles allowed" ); | |
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2387 if (_cfg->get_block_for_node(inp) == bb) { // Block-local use? |
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2388 if (inp->is_Proj()) { // Skip through Proj's |
0 | 2389 inp = inp->in(0); |
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2390 } |
0 | 2391 ++_uses[inp->_idx]; // Count 1 block-local use |
2392 } | |
2393 } | |
2394 | |
2395 // If this instruction has a 0 use count, then it is available | |
2396 if (!_uses[n->_idx]) { | |
2397 _current_latency[n->_idx] = _bundle_cycle_number; | |
2398 AddNodeToAvailableList(n); | |
2399 } | |
2400 | |
2401 #ifndef PRODUCT | |
2402 if (_cfg->C->trace_opto_output()) { | |
2403 tty->print("# uses: %3d: ", _uses[n->_idx]); | |
2404 n->dump(); | |
2405 } | |
2406 #endif | |
2407 } | |
2408 | |
2409 #ifndef PRODUCT | |
2410 if (_cfg->C->trace_opto_output()) | |
2411 tty->print("# <- ComputeUseCount\n"); | |
2412 #endif | |
2413 } | |
2414 | |
2415 // This routine performs scheduling on each basic block in reverse order, | |
2416 // using instruction latencies and taking into account function unit | |
2417 // availability. | |
2418 void Scheduling::DoScheduling() { | |
2419 #ifndef PRODUCT | |
2420 if (_cfg->C->trace_opto_output()) | |
2421 tty->print("# -> DoScheduling\n"); | |
2422 #endif | |
2423 | |
2424 Block *succ_bb = NULL; | |
2425 Block *bb; | |
2426 | |
2427 // Walk over all the basic blocks in reverse order | |
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2428 for (int i = _cfg->number_of_blocks() - 1; i >= 0; succ_bb = bb, i--) { |
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2429 bb = _cfg->get_block(i); |
0 | 2430 |
2431 #ifndef PRODUCT | |
2432 if (_cfg->C->trace_opto_output()) { | |
2433 tty->print("# Schedule BB#%03d (initial)\n", i); | |
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2434 for (uint j = 0; j < bb->number_of_nodes(); j++) { |
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2435 bb->get_node(j)->dump(); |
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2436 } |
0 | 2437 } |
2438 #endif | |
2439 | |
2440 // On the head node, skip processing | |
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2441 if (bb == _cfg->get_root_block()) { |
0 | 2442 continue; |
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2443 } |
0 | 2444 |
2445 // Skip empty, connector blocks | |
2446 if (bb->is_connector()) | |
2447 continue; | |
2448 | |
2449 // If the following block is not the sole successor of | |
2450 // this one, then reset the pipeline information | |
2451 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) { | |
2452 #ifndef PRODUCT | |
2453 if (_cfg->C->trace_opto_output()) { | |
2454 tty->print("*** bundle start of next BB, node %d, for %d instructions\n", | |
2455 _next_node->_idx, _bundle_instr_count); | |
2456 } | |
2457 #endif | |
2458 step_and_clear(); | |
2459 } | |
2460 | |
2461 // Leave untouched the starting instruction, any Phis, a CreateEx node | |
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2462 // or Top. bb->get_node(_bb_start) is the first schedulable instruction. |
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2463 _bb_end = bb->number_of_nodes()-1; |
0 | 2464 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) { |
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2465 Node *n = bb->get_node(_bb_start); |
0 | 2466 // Things not matched, like Phinodes and ProjNodes don't get scheduled. |
2467 // Also, MachIdealNodes do not get scheduled | |
2468 if( !n->is_Mach() ) continue; // Skip non-machine nodes | |
2469 MachNode *mach = n->as_Mach(); | |
2470 int iop = mach->ideal_Opcode(); | |
2471 if( iop == Op_CreateEx ) continue; // CreateEx is pinned | |
2472 if( iop == Op_Con ) continue; // Do not schedule Top | |
2473 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes | |
2474 mach->pipeline() == MachNode::pipeline_class() && | |
2475 !n->is_SpillCopy() ) // Breakpoints, Prolog, etc | |
2476 continue; | |
2477 break; // Funny loop structure to be sure... | |
2478 } | |
2479 // Compute last "interesting" instruction in block - last instruction we | |
2480 // might schedule. _bb_end points just after last schedulable inst. We | |
2481 // normally schedule conditional branches (despite them being forced last | |
2482 // in the block), because they have delay slots we can fill. Calls all | |
2483 // have their delay slots filled in the template expansions, so we don't | |
2484 // bother scheduling them. | |
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2485 Node *last = bb->get_node(_bb_end); |
3851 | 2486 // Ignore trailing NOPs. |
2487 while (_bb_end > 0 && last->is_Mach() && | |
2488 last->as_Mach()->ideal_Opcode() == Op_Con) { | |
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2489 last = bb->get_node(--_bb_end); |
3851 | 2490 } |
2491 assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, ""); | |
0 | 2492 if( last->is_Catch() || |
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2493 // Exclude unreachable path case when Halt node is in a separate block. |
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2494 (_bb_end > 1 && last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) { |
0 | 2495 // There must be a prior call. Skip it. |
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2496 while( !bb->get_node(--_bb_end)->is_MachCall() ) { |
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2497 assert( bb->get_node(_bb_end)->is_MachProj(), "skipping projections after expected call" ); |
0 | 2498 } |
2499 } else if( last->is_MachNullCheck() ) { | |
2500 // Backup so the last null-checked memory instruction is | |
2501 // outside the schedulable range. Skip over the nullcheck, | |
2502 // projection, and the memory nodes. | |
2503 Node *mem = last->in(1); | |
2504 do { | |
2505 _bb_end--; | |
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2506 } while (mem != bb->get_node(_bb_end)); |
0 | 2507 } else { |
2508 // Set _bb_end to point after last schedulable inst. | |
2509 _bb_end++; | |
2510 } | |
2511 | |
2512 assert( _bb_start <= _bb_end, "inverted block ends" ); | |
2513 | |
2514 // Compute the register antidependencies for the basic block | |
2515 ComputeRegisterAntidependencies(bb); | |
2516 if (_cfg->C->failing()) return; // too many D-U pinch points | |
2517 | |
2518 // Compute intra-bb latencies for the nodes | |
2519 ComputeLocalLatenciesForward(bb); | |
2520 | |
2521 // Compute the usage within the block, and set the list of all nodes | |
2522 // in the block that have no uses within the block. | |
2523 ComputeUseCount(bb); | |
2524 | |
2525 // Schedule the remaining instructions in the block | |
2526 while ( _available.size() > 0 ) { | |
2527 Node *n = ChooseNodeToBundle(); | |
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2528 guarantee(n != NULL, "no nodes available"); |
0 | 2529 AddNodeToBundle(n,bb); |
2530 } | |
2531 | |
2532 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" ); | |
2533 #ifdef ASSERT | |
2534 for( uint l = _bb_start; l < _bb_end; l++ ) { | |
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2535 Node *n = bb->get_node(l); |
0 | 2536 uint m; |
2537 for( m = 0; m < _bb_end-_bb_start; m++ ) | |
2538 if( _scheduled[m] == n ) | |
2539 break; | |
2540 assert( m < _bb_end-_bb_start, "instruction missing in schedule" ); | |
2541 } | |
2542 #endif | |
2543 | |
2544 // Now copy the instructions (in reverse order) back to the block | |
2545 for ( uint k = _bb_start; k < _bb_end; k++ ) | |
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2546 bb->map_node(_scheduled[_bb_end-k-1], k); |
0 | 2547 |
2548 #ifndef PRODUCT | |
2549 if (_cfg->C->trace_opto_output()) { | |
2550 tty->print("# Schedule BB#%03d (final)\n", i); | |
2551 uint current = 0; | |
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2552 for (uint j = 0; j < bb->number_of_nodes(); j++) { |
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2553 Node *n = bb->get_node(j); |
0 | 2554 if( valid_bundle_info(n) ) { |
2555 Bundle *bundle = node_bundling(n); | |
2556 if (bundle->instr_count() > 0 || bundle->flags() > 0) { | |
2557 tty->print("*** Bundle: "); | |
2558 bundle->dump(); | |
2559 } | |
2560 n->dump(); | |
2561 } | |
2562 } | |
2563 } | |
2564 #endif | |
2565 #ifdef ASSERT | |
2566 verify_good_schedule(bb,"after block local scheduling"); | |
2567 #endif | |
2568 } | |
2569 | |
2570 #ifndef PRODUCT | |
2571 if (_cfg->C->trace_opto_output()) | |
2572 tty->print("# <- DoScheduling\n"); | |
2573 #endif | |
2574 | |
2575 // Record final node-bundling array location | |
2576 _regalloc->C->set_node_bundling_base(_node_bundling_base); | |
2577 | |
2578 } // end DoScheduling | |
2579 | |
2580 // Verify that no live-range used in the block is killed in the block by a | |
2581 // wrong DEF. This doesn't verify live-ranges that span blocks. | |
2582 | |
2583 // Check for edge existence. Used to avoid adding redundant precedence edges. | |
2584 static bool edge_from_to( Node *from, Node *to ) { | |
2585 for( uint i=0; i<from->len(); i++ ) | |
2586 if( from->in(i) == to ) | |
2587 return true; | |
2588 return false; | |
2589 } | |
2590 | |
2591 #ifdef ASSERT | |
2592 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) { | |
2593 // Check for bad kills | |
2594 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow | |
2595 Node *prior_use = _reg_node[def]; | |
2596 if( prior_use && !edge_from_to(prior_use,n) ) { | |
2597 tty->print("%s = ",OptoReg::as_VMReg(def)->name()); | |
2598 n->dump(); | |
2599 tty->print_cr("..."); | |
2600 prior_use->dump(); | |
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2601 assert(edge_from_to(prior_use,n),msg); |
0 | 2602 } |
2603 _reg_node.map(def,NULL); // Kill live USEs | |
2604 } | |
2605 } | |
2606 | |
2607 void Scheduling::verify_good_schedule( Block *b, const char *msg ) { | |
2608 | |
2609 // Zap to something reasonable for the verify code | |
2610 _reg_node.clear(); | |
2611 | |
2612 // Walk over the block backwards. Check to make sure each DEF doesn't | |
2613 // kill a live value (other than the one it's supposed to). Add each | |
2614 // USE to the live set. | |
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2615 for( uint i = b->number_of_nodes()-1; i >= _bb_start; i-- ) { |
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2616 Node *n = b->get_node(i); |
0 | 2617 int n_op = n->Opcode(); |
2618 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
2619 // Fat-proj kills a slew of registers | |
2620 RegMask rm = n->out_RegMask();// Make local copy | |
2621 while( rm.is_NotEmpty() ) { | |
2622 OptoReg::Name kill = rm.find_first_elem(); | |
2623 rm.Remove(kill); | |
2624 verify_do_def( n, kill, msg ); | |
2625 } | |
2626 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes | |
2627 // Get DEF'd registers the normal way | |
2628 verify_do_def( n, _regalloc->get_reg_first(n), msg ); | |
2629 verify_do_def( n, _regalloc->get_reg_second(n), msg ); | |
2630 } | |
2631 | |
2632 // Now make all USEs live | |
2633 for( uint i=1; i<n->req(); i++ ) { | |
2634 Node *def = n->in(i); | |
2635 assert(def != 0, "input edge required"); | |
2636 OptoReg::Name reg_lo = _regalloc->get_reg_first(def); | |
2637 OptoReg::Name reg_hi = _regalloc->get_reg_second(def); | |
2638 if( OptoReg::is_valid(reg_lo) ) { | |
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2639 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), msg); |
0 | 2640 _reg_node.map(reg_lo,n); |
2641 } | |
2642 if( OptoReg::is_valid(reg_hi) ) { | |
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2643 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), msg); |
0 | 2644 _reg_node.map(reg_hi,n); |
2645 } | |
2646 } | |
2647 | |
2648 } | |
2649 | |
2650 // Zap to something reasonable for the Antidependence code | |
2651 _reg_node.clear(); | |
2652 } | |
2653 #endif | |
2654 | |
2655 // Conditionally add precedence edges. Avoid putting edges on Projs. | |
2656 static void add_prec_edge_from_to( Node *from, Node *to ) { | |
2657 if( from->is_Proj() ) { // Put precedence edge on Proj's input | |
2658 assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" ); | |
2659 from = from->in(0); | |
2660 } | |
2661 if( from != to && // No cycles (for things like LD L0,[L0+4] ) | |
2662 !edge_from_to( from, to ) ) // Avoid duplicate edge | |
2663 from->add_prec(to); | |
2664 } | |
2665 | |
2666 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) { | |
2667 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow | |
2668 return; | |
2669 | |
2670 Node *pinch = _reg_node[def_reg]; // Get pinch point | |
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2671 if ((pinch == NULL) || _cfg->get_block_for_node(pinch) != b || // No pinch-point yet? |
0 | 2672 is_def ) { // Check for a true def (not a kill) |
2673 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point | |
2674 return; | |
2675 } | |
2676 | |
2677 Node *kill = def; // Rename 'def' to more descriptive 'kill' | |
2678 debug_only( def = (Node*)0xdeadbeef; ) | |
2679 | |
2680 // After some number of kills there _may_ be a later def | |
2681 Node *later_def = NULL; | |
2682 | |
2683 // Finding a kill requires a real pinch-point. | |
2684 // Check for not already having a pinch-point. | |
2685 // Pinch points are Op_Node's. | |
2686 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point? | |
2687 later_def = pinch; // Must be def/kill as optimistic pinch-point | |
2688 if ( _pinch_free_list.size() > 0) { | |
2689 pinch = _pinch_free_list.pop(); | |
2690 } else { | |
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2691 pinch = new (_cfg->C) Node(1); // Pinch point to-be |
0 | 2692 } |
2693 if (pinch->_idx >= _regalloc->node_regs_max_index()) { | |
2694 _cfg->C->record_method_not_compilable("too many D-U pinch points"); | |
2695 return; | |
2696 } | |
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2697 _cfg->map_node_to_block(pinch, b); // Pretend it's valid in this block (lazy init) |
0 | 2698 _reg_node.map(def_reg,pinch); // Record pinch-point |
2699 //_regalloc->set_bad(pinch->_idx); // Already initialized this way. | |
2700 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill | |
2701 pinch->init_req(0, _cfg->C->top()); // set not NULL for the next call | |
2702 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch | |
2703 later_def = NULL; // and no later def | |
2704 } | |
2705 pinch->set_req(0,later_def); // Hook later def so we can find it | |
2706 } else { // Else have valid pinch point | |
2707 if( pinch->in(0) ) // If there is a later-def | |
2708 later_def = pinch->in(0); // Get it | |
2709 } | |
2710 | |
2711 // Add output-dependence edge from later def to kill | |
2712 if( later_def ) // If there is some original def | |
2713 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill | |
2714 | |
2715 // See if current kill is also a use, and so is forced to be the pinch-point. | |
2716 if( pinch->Opcode() == Op_Node ) { | |
2717 Node *uses = kill->is_Proj() ? kill->in(0) : kill; | |
2718 for( uint i=1; i<uses->req(); i++ ) { | |
2719 if( _regalloc->get_reg_first(uses->in(i)) == def_reg || | |
2720 _regalloc->get_reg_second(uses->in(i)) == def_reg ) { | |
2721 // Yes, found a use/kill pinch-point | |
2722 pinch->set_req(0,NULL); // | |
2723 pinch->replace_by(kill); // Move anti-dep edges up | |
2724 pinch = kill; | |
2725 _reg_node.map(def_reg,pinch); | |
2726 return; | |
2727 } | |
2728 } | |
2729 } | |
2730 | |
2731 // Add edge from kill to pinch-point | |
2732 add_prec_edge_from_to(kill,pinch); | |
2733 } | |
2734 | |
2735 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) { | |
2736 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow | |
2737 return; | |
2738 Node *pinch = _reg_node[use_reg]; // Get pinch point | |
2739 // Check for no later def_reg/kill in block | |
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2740 if ((pinch != NULL) && _cfg->get_block_for_node(pinch) == b && |
0 | 2741 // Use has to be block-local as well |
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2742 _cfg->get_block_for_node(use) == b) { |
0 | 2743 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?) |
2744 pinch->req() == 1 ) { // pinch not yet in block? | |
2745 pinch->del_req(0); // yank pointer to later-def, also set flag | |
2746 // Insert the pinch-point in the block just after the last use | |
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2747 b->insert_node(pinch, b->find_node(use) + 1); |
0 | 2748 _bb_end++; // Increase size scheduled region in block |
2749 } | |
2750 | |
2751 add_prec_edge_from_to(pinch,use); | |
2752 } | |
2753 } | |
2754 | |
2755 // We insert antidependences between the reads and following write of | |
2756 // allocated registers to prevent illegal code motion. Hopefully, the | |
2757 // number of added references should be fairly small, especially as we | |
2758 // are only adding references within the current basic block. | |
2759 void Scheduling::ComputeRegisterAntidependencies(Block *b) { | |
2760 | |
2761 #ifdef ASSERT | |
2762 verify_good_schedule(b,"before block local scheduling"); | |
2763 #endif | |
2764 | |
2765 // A valid schedule, for each register independently, is an endless cycle | |
2766 // of: a def, then some uses (connected to the def by true dependencies), | |
2767 // then some kills (defs with no uses), finally the cycle repeats with a new | |
2768 // def. The uses are allowed to float relative to each other, as are the | |
2769 // kills. No use is allowed to slide past a kill (or def). This requires | |
2770 // antidependencies between all uses of a single def and all kills that | |
2771 // follow, up to the next def. More edges are redundant, because later defs | |
2772 // & kills are already serialized with true or antidependencies. To keep | |
2773 // the edge count down, we add a 'pinch point' node if there's more than | |
2774 // one use or more than one kill/def. | |
2775 | |
2776 // We add dependencies in one bottom-up pass. | |
2777 | |
2778 // For each instruction we handle it's DEFs/KILLs, then it's USEs. | |
2779 | |
2780 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this | |
2781 // register. If not, we record the DEF/KILL in _reg_node, the | |
2782 // register-to-def mapping. If there is a prior DEF/KILL, we insert a | |
2783 // "pinch point", a new Node that's in the graph but not in the block. | |
2784 // We put edges from the prior and current DEF/KILLs to the pinch point. | |
2785 // We put the pinch point in _reg_node. If there's already a pinch point | |
2786 // we merely add an edge from the current DEF/KILL to the pinch point. | |
2787 | |
2788 // After doing the DEF/KILLs, we handle USEs. For each used register, we | |
2789 // put an edge from the pinch point to the USE. | |
2790 | |
2791 // To be expedient, the _reg_node array is pre-allocated for the whole | |
2792 // compilation. _reg_node is lazily initialized; it either contains a NULL, | |
2793 // or a valid def/kill/pinch-point, or a leftover node from some prior | |
2794 // block. Leftover node from some prior block is treated like a NULL (no | |
2795 // prior def, so no anti-dependence needed). Valid def is distinguished by | |
2796 // it being in the current block. | |
2797 bool fat_proj_seen = false; | |
2798 uint last_safept = _bb_end-1; | |
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2799 Node* end_node = (_bb_end-1 >= _bb_start) ? b->get_node(last_safept) : NULL; |
0 | 2800 Node* last_safept_node = end_node; |
2801 for( uint i = _bb_end-1; i >= _bb_start; i-- ) { | |
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2802 Node *n = b->get_node(i); |
0 | 2803 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges |
3842 | 2804 if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) { |
0 | 2805 // Fat-proj kills a slew of registers |
2806 // This can add edges to 'n' and obscure whether or not it was a def, | |
2807 // hence the is_def flag. | |
2808 fat_proj_seen = true; | |
2809 RegMask rm = n->out_RegMask();// Make local copy | |
2810 while( rm.is_NotEmpty() ) { | |
2811 OptoReg::Name kill = rm.find_first_elem(); | |
2812 rm.Remove(kill); | |
2813 anti_do_def( b, n, kill, is_def ); | |
2814 } | |
2815 } else { | |
2816 // Get DEF'd registers the normal way | |
2817 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def ); | |
2818 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def ); | |
2819 } | |
2820 | |
3851 | 2821 // Kill projections on a branch should appear to occur on the |
2822 // branch, not afterwards, so grab the masks from the projections | |
2823 // and process them. | |
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2824 if (n->is_MachBranch() || n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump) { |
3851 | 2825 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
2826 Node* use = n->fast_out(i); | |
2827 if (use->is_Proj()) { | |
2828 RegMask rm = use->out_RegMask();// Make local copy | |
2829 while( rm.is_NotEmpty() ) { | |
2830 OptoReg::Name kill = rm.find_first_elem(); | |
2831 rm.Remove(kill); | |
2832 anti_do_def( b, n, kill, false ); | |
2833 } | |
2834 } | |
2835 } | |
2836 } | |
2837 | |
0 | 2838 // Check each register used by this instruction for a following DEF/KILL |
2839 // that must occur afterward and requires an anti-dependence edge. | |
2840 for( uint j=0; j<n->req(); j++ ) { | |
2841 Node *def = n->in(j); | |
2842 if( def ) { | |
3842 | 2843 assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" ); |
0 | 2844 anti_do_use( b, n, _regalloc->get_reg_first(def) ); |
2845 anti_do_use( b, n, _regalloc->get_reg_second(def) ); | |
2846 } | |
2847 } | |
2848 // Do not allow defs of new derived values to float above GC | |
2849 // points unless the base is definitely available at the GC point. | |
2850 | |
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2851 Node *m = b->get_node(i); |
0 | 2852 |
2853 // Add precedence edge from following safepoint to use of derived pointer | |
2854 if( last_safept_node != end_node && | |
2855 m != last_safept_node) { | |
2856 for (uint k = 1; k < m->req(); k++) { | |
2857 const Type *t = m->in(k)->bottom_type(); | |
2858 if( t->isa_oop_ptr() && | |
2859 t->is_ptr()->offset() != 0 ) { | |
2860 last_safept_node->add_prec( m ); | |
2861 break; | |
2862 } | |
2863 } | |
2864 } | |
2865 | |
2866 if( n->jvms() ) { // Precedence edge from derived to safept | |
2867 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use() | |
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2868 if( b->get_node(last_safept) != last_safept_node ) { |
0 | 2869 last_safept = b->find_node(last_safept_node); |
2870 } | |
2871 for( uint j=last_safept; j > i; j-- ) { | |
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2872 Node *mach = b->get_node(j); |
0 | 2873 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP ) |
2874 mach->add_prec( n ); | |
2875 } | |
2876 last_safept = i; | |
2877 last_safept_node = m; | |
2878 } | |
2879 } | |
2880 | |
2881 if (fat_proj_seen) { | |
2882 // Garbage collect pinch nodes that were not consumed. | |
2883 // They are usually created by a fat kill MachProj for a call. | |
2884 garbage_collect_pinch_nodes(); | |
2885 } | |
2886 } | |
2887 | |
2888 // Garbage collect pinch nodes for reuse by other blocks. | |
2889 // | |
2890 // The block scheduler's insertion of anti-dependence | |
2891 // edges creates many pinch nodes when the block contains | |
2892 // 2 or more Calls. A pinch node is used to prevent a | |
2893 // combinatorial explosion of edges. If a set of kills for a | |
2894 // register is anti-dependent on a set of uses (or defs), rather | |
2895 // than adding an edge in the graph between each pair of kill | |
2896 // and use (or def), a pinch is inserted between them: | |
2897 // | |
2898 // use1 use2 use3 | |
2899 // \ | / | |
2900 // \ | / | |
2901 // pinch | |
2902 // / | \ | |
2903 // / | \ | |
2904 // kill1 kill2 kill3 | |
2905 // | |
2906 // One pinch node is created per register killed when | |
2907 // the second call is encountered during a backwards pass | |
2908 // over the block. Most of these pinch nodes are never | |
2909 // wired into the graph because the register is never | |
2910 // used or def'ed in the block. | |
2911 // | |
2912 void Scheduling::garbage_collect_pinch_nodes() { | |
2913 #ifndef PRODUCT | |
2914 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:"); | |
2915 #endif | |
2916 int trace_cnt = 0; | |
2917 for (uint k = 0; k < _reg_node.Size(); k++) { | |
2918 Node* pinch = _reg_node[k]; | |
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2919 if ((pinch != NULL) && pinch->Opcode() == Op_Node && |
0 | 2920 // no predecence input edges |
2921 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) { | |
2922 cleanup_pinch(pinch); | |
2923 _pinch_free_list.push(pinch); | |
2924 _reg_node.map(k, NULL); | |
2925 #ifndef PRODUCT | |
2926 if (_cfg->C->trace_opto_output()) { | |
2927 trace_cnt++; | |
2928 if (trace_cnt > 40) { | |
2929 tty->print("\n"); | |
2930 trace_cnt = 0; | |
2931 } | |
2932 tty->print(" %d", pinch->_idx); | |
2933 } | |
2934 #endif | |
2935 } | |
2936 } | |
2937 #ifndef PRODUCT | |
2938 if (_cfg->C->trace_opto_output()) tty->print("\n"); | |
2939 #endif | |
2940 } | |
2941 | |
2942 // Clean up a pinch node for reuse. | |
2943 void Scheduling::cleanup_pinch( Node *pinch ) { | |
2944 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking"); | |
2945 | |
2946 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) { | |
2947 Node* use = pinch->last_out(i); | |
2948 uint uses_found = 0; | |
2949 for (uint j = use->req(); j < use->len(); j++) { | |
2950 if (use->in(j) == pinch) { | |
2951 use->rm_prec(j); | |
2952 uses_found++; | |
2953 } | |
2954 } | |
2955 assert(uses_found > 0, "must be a precedence edge"); | |
2956 i -= uses_found; // we deleted 1 or more copies of this edge | |
2957 } | |
2958 // May have a later_def entry | |
2959 pinch->set_req(0, NULL); | |
2960 } | |
2961 | |
2962 #ifndef PRODUCT | |
2963 | |
2964 void Scheduling::dump_available() const { | |
2965 tty->print("#Availist "); | |
2966 for (uint i = 0; i < _available.size(); i++) | |
2967 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]); | |
2968 tty->cr(); | |
2969 } | |
2970 | |
2971 // Print Scheduling Statistics | |
2972 void Scheduling::print_statistics() { | |
2973 // Print the size added by nops for bundling | |
2974 tty->print("Nops added %d bytes to total of %d bytes", | |
2975 _total_nop_size, _total_method_size); | |
2976 if (_total_method_size > 0) | |
2977 tty->print(", for %.2f%%", | |
2978 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0); | |
2979 tty->print("\n"); | |
2980 | |
2981 // Print the number of branch shadows filled | |
2982 if (Pipeline::_branch_has_delay_slot) { | |
2983 tty->print("Of %d branches, %d had unconditional delay slots filled", | |
2984 _total_branches, _total_unconditional_delays); | |
2985 if (_total_branches > 0) | |
2986 tty->print(", for %.2f%%", | |
2987 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0); | |
2988 tty->print("\n"); | |
2989 } | |
2990 | |
2991 uint total_instructions = 0, total_bundles = 0; | |
2992 | |
2993 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) { | |
2994 uint bundle_count = _total_instructions_per_bundle[i]; | |
2995 total_instructions += bundle_count * i; | |
2996 total_bundles += bundle_count; | |
2997 } | |
2998 | |
2999 if (total_bundles > 0) | |
3000 tty->print("Average ILP (excluding nops) is %.2f\n", | |
3001 ((double)total_instructions) / ((double)total_bundles)); | |
3002 } | |
3003 #endif |