Mercurial > hg > truffle
annotate src/share/vm/opto/output.cpp @ 19211:6081b30fe164
Make LocationMarker a LowLevelMidTierPhase.
| author | Josef Eisl <josef.eisl@jku.at> |
|---|---|
| date | Fri, 06 Feb 2015 20:06:38 +0100 |
| parents | 52b4284cb496 |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 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 methodHandle null_mh; |
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974 bool rethrow_exception = false; |
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975 debug_info()->describe_scope(safepoint_pc_offset, null_mh, scope_method, jvms->bci(), jvms->should_reexecute(), rethrow_exception, is_method_handle_invoke, return_oop, locvals, expvals, monvals); |
| 0 | 976 } // End jvms loop |
| 977 | |
| 978 // Mark the end of the scope set. | |
| 979 debug_info()->end_safepoint(safepoint_pc_offset); | |
| 980 } | |
| 981 | |
| 982 | |
| 983 | |
| 984 // A simplified version of Process_OopMap_Node, to handle non-safepoints. | |
| 985 class NonSafepointEmitter { | |
| 986 Compile* C; | |
| 987 JVMState* _pending_jvms; | |
| 988 int _pending_offset; | |
| 989 | |
| 990 void emit_non_safepoint(); | |
| 991 | |
| 992 public: | |
| 993 NonSafepointEmitter(Compile* compile) { | |
| 994 this->C = compile; | |
| 995 _pending_jvms = NULL; | |
| 996 _pending_offset = 0; | |
| 997 } | |
| 998 | |
| 999 void observe_instruction(Node* n, int pc_offset) { | |
| 1000 if (!C->debug_info()->recording_non_safepoints()) return; | |
| 1001 | |
| 1002 Node_Notes* nn = C->node_notes_at(n->_idx); | |
| 1003 if (nn == NULL || nn->jvms() == NULL) return; | |
| 1004 if (_pending_jvms != NULL && | |
| 1005 _pending_jvms->same_calls_as(nn->jvms())) { | |
| 1006 // Repeated JVMS? Stretch it up here. | |
| 1007 _pending_offset = pc_offset; | |
| 1008 } else { | |
| 1009 if (_pending_jvms != NULL && | |
| 1010 _pending_offset < pc_offset) { | |
| 1011 emit_non_safepoint(); | |
| 1012 } | |
| 1013 _pending_jvms = NULL; | |
| 1014 if (pc_offset > C->debug_info()->last_pc_offset()) { | |
| 1015 // This is the only way _pending_jvms can become non-NULL: | |
| 1016 _pending_jvms = nn->jvms(); | |
| 1017 _pending_offset = pc_offset; | |
| 1018 } | |
| 1019 } | |
| 1020 } | |
| 1021 | |
| 1022 // Stay out of the way of real safepoints: | |
| 1023 void observe_safepoint(JVMState* jvms, int pc_offset) { | |
| 1024 if (_pending_jvms != NULL && | |
| 1025 !_pending_jvms->same_calls_as(jvms) && | |
| 1026 _pending_offset < pc_offset) { | |
| 1027 emit_non_safepoint(); | |
| 1028 } | |
| 1029 _pending_jvms = NULL; | |
| 1030 } | |
| 1031 | |
| 1032 void flush_at_end() { | |
| 1033 if (_pending_jvms != NULL) { | |
| 1034 emit_non_safepoint(); | |
| 1035 } | |
| 1036 _pending_jvms = NULL; | |
| 1037 } | |
| 1038 }; | |
| 1039 | |
| 1040 void NonSafepointEmitter::emit_non_safepoint() { | |
| 1041 JVMState* youngest_jvms = _pending_jvms; | |
| 1042 int pc_offset = _pending_offset; | |
| 1043 | |
| 1044 // Clear it now: | |
| 1045 _pending_jvms = NULL; | |
| 1046 | |
| 1047 DebugInformationRecorder* debug_info = C->debug_info(); | |
| 1048 assert(debug_info->recording_non_safepoints(), "sanity"); | |
| 1049 | |
| 1050 debug_info->add_non_safepoint(pc_offset); | |
| 1051 int max_depth = youngest_jvms->depth(); | |
| 1052 | |
| 1053 // Visit scopes from oldest to youngest. | |
| 1054 for (int depth = 1; depth <= max_depth; depth++) { | |
| 1055 JVMState* jvms = youngest_jvms->of_depth(depth); | |
| 1056 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
|
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1057 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest"); |
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1058 methodHandle null_mh; |
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1059 debug_info->describe_scope(pc_offset, null_mh, method, jvms->bci(), jvms->should_reexecute()); |
| 0 | 1060 } |
| 1061 | |
| 1062 // Mark the end of the scope set. | |
| 1063 debug_info->end_non_safepoint(pc_offset); | |
| 1064 } | |
| 1065 | |
| 3851 | 1066 //------------------------------init_buffer------------------------------------ |
| 1067 CodeBuffer* Compile::init_buffer(uint* blk_starts) { | |
| 0 | 1068 |
| 1069 // Set the initially allocated size | |
| 1070 int code_req = initial_code_capacity; | |
| 1071 int locs_req = initial_locs_capacity; | |
| 1072 int stub_req = TraceJumps ? initial_stub_capacity * 10 : initial_stub_capacity; | |
| 1073 int const_req = initial_const_capacity; | |
| 1074 | |
| 1075 int pad_req = NativeCall::instruction_size; | |
| 1076 // The extra spacing after the code is necessary on some platforms. | |
| 1077 // Sometimes we need to patch in a jump after the last instruction, | |
| 1078 // if the nmethod has been deoptimized. (See 4932387, 4894843.) | |
| 1079 | |
| 1080 // Compute the byte offset where we can store the deopt pc. | |
| 1081 if (fixed_slots() != 0) { | |
| 1082 _orig_pc_slot_offset_in_bytes = _regalloc->reg2offset(OptoReg::stack2reg(_orig_pc_slot)); | |
| 1083 } | |
| 1084 | |
| 1085 // Compute prolog code size | |
| 1086 _method_size = 0; | |
| 1087 _frame_slots = OptoReg::reg2stack(_matcher->_old_SP)+_regalloc->_framesize; | |
|
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1088 #if defined(IA64) && !defined(AIX) |
| 0 | 1089 if (save_argument_registers()) { |
| 1090 // 4815101: this is a stub with implicit and unknown precision fp args. | |
| 1091 // The usual spill mechanism can only generate stfd's in this case, which | |
| 1092 // doesn't work if the fp reg to spill contains a single-precision denorm. | |
| 1093 // Instead, we hack around the normal spill mechanism using stfspill's and | |
| 1094 // ldffill's in the MachProlog and MachEpilog emit methods. We allocate | |
| 1095 // space here for the fp arg regs (f8-f15) we're going to thusly spill. | |
| 1096 // | |
| 1097 // If we ever implement 16-byte 'registers' == stack slots, we can | |
| 1098 // get rid of this hack and have SpillCopy generate stfspill/ldffill | |
| 1099 // instead of stfd/stfs/ldfd/ldfs. | |
| 1100 _frame_slots += 8*(16/BytesPerInt); | |
| 1101 } | |
| 1102 #endif | |
| 3851 | 1103 assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check"); |
| 0 | 1104 |
| 2008 | 1105 if (has_mach_constant_base_node()) { |
|
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1106 uint add_size = 0; |
| 2008 | 1107 // Fill the constant table. |
| 3851 | 1108 // Note: This must happen before shorten_branches. |
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1109 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
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1110 Block* b = _cfg->get_block(i); |
| 2008 | 1111 |
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1112 for (uint j = 0; j < b->number_of_nodes(); j++) { |
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1113 Node* n = b->get_node(j); |
| 2008 | 1114 |
| 1115 // If the node is a MachConstantNode evaluate the constant | |
| 1116 // value section. | |
| 1117 if (n->is_MachConstant()) { | |
| 1118 MachConstantNode* machcon = n->as_MachConstant(); | |
| 1119 machcon->eval_constant(C); | |
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1120 } else if (n->is_Mach()) { |
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1121 // On Power there are more nodes that issue constants. |
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1122 add_size += (n->as_Mach()->ins_num_consts() * 8); |
| 2008 | 1123 } |
| 1124 } | |
| 1125 } | |
| 1126 | |
| 1127 // Calculate the offsets of the constants and the size of the | |
| 1128 // constant table (including the padding to the next section). | |
| 1129 constant_table().calculate_offsets_and_size(); | |
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1130 const_req = constant_table().size() + add_size; |
| 2008 | 1131 } |
| 1132 | |
| 1133 // Initialize the space for the BufferBlob used to find and verify | |
| 1134 // instruction size in MachNode::emit_size() | |
| 1135 init_scratch_buffer_blob(const_req); | |
| 3851 | 1136 if (failing()) return NULL; // Out of memory |
| 1137 | |
| 1138 // Pre-compute the length of blocks and replace | |
| 1139 // long branches with short if machine supports it. | |
| 1140 shorten_branches(blk_starts, code_req, locs_req, stub_req); | |
| 0 | 1141 |
| 1142 // nmethod and CodeBuffer count stubs & constants as part of method's code. | |
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1143 // class HandlerImpl is platform-specific and defined in the *.ad files. |
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1144 int exception_handler_req = HandlerImpl::size_exception_handler() + MAX_stubs_size; // add marginal slop for handler |
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1145 int deopt_handler_req = HandlerImpl::size_deopt_handler() + MAX_stubs_size; // add marginal slop for handler |
| 0 | 1146 stub_req += MAX_stubs_size; // ensure per-stub margin |
| 1147 code_req += MAX_inst_size; // ensure per-instruction margin | |
| 1265 | 1148 |
| 0 | 1149 if (StressCodeBuffers) |
| 1150 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion | |
| 1265 | 1151 |
| 1152 int total_req = | |
| 2008 | 1153 const_req + |
| 1265 | 1154 code_req + |
| 1155 pad_req + | |
| 1156 stub_req + | |
| 1157 exception_handler_req + | |
| 2008 | 1158 deopt_handler_req; // deopt handler |
| 1265 | 1159 |
| 1160 if (has_method_handle_invokes()) | |
| 1161 total_req += deopt_handler_req; // deopt MH handler | |
| 1162 | |
| 0 | 1163 CodeBuffer* cb = code_buffer(); |
| 1164 cb->initialize(total_req, locs_req); | |
| 1165 | |
| 1166 // Have we run out of code space? | |
| 1202 | 1167 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
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1168 C->record_failure("CodeCache is full"); |
| 3851 | 1169 return NULL; |
| 0 | 1170 } |
| 1171 // Configure the code buffer. | |
| 1172 cb->initialize_consts_size(const_req); | |
| 1173 cb->initialize_stubs_size(stub_req); | |
| 1174 cb->initialize_oop_recorder(env()->oop_recorder()); | |
| 1175 | |
| 1176 // fill in the nop array for bundling computations | |
| 1177 MachNode *_nop_list[Bundle::_nop_count]; | |
| 1178 Bundle::initialize_nops(_nop_list, this); | |
| 1179 | |
| 3851 | 1180 return cb; |
| 1181 } | |
| 1182 | |
| 1183 //------------------------------fill_buffer------------------------------------ | |
| 1184 void Compile::fill_buffer(CodeBuffer* cb, uint* blk_starts) { | |
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1185 // blk_starts[] contains offsets calculated during short branches processing, |
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1186 // offsets should not be increased during following steps. |
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1187 |
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1188 // Compute the size of first NumberOfLoopInstrToAlign instructions at head |
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1189 // of a loop. It is used to determine the padding for loop alignment. |
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1190 compute_loop_first_inst_sizes(); |
| 3851 | 1191 |
| 0 | 1192 // Create oopmap set. |
| 1193 _oop_map_set = new OopMapSet(); | |
| 1194 | |
| 1195 // !!!!! This preserves old handling of oopmaps for now | |
| 1196 debug_info()->set_oopmaps(_oop_map_set); | |
| 1197 | |
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1198 uint nblocks = _cfg->number_of_blocks(); |
| 0 | 1199 // Count and start of implicit null check instructions |
| 1200 uint inct_cnt = 0; | |
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1201 uint *inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1); |
| 0 | 1202 |
| 1203 // Count and start of calls | |
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1204 uint *call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1); |
| 0 | 1205 |
| 1206 uint return_offset = 0; | |
|
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1207 int nop_size = (new (this) MachNopNode())->size(_regalloc); |
| 0 | 1208 |
| 1209 int previous_offset = 0; | |
| 1210 int current_offset = 0; | |
| 1211 int last_call_offset = -1; | |
| 3851 | 1212 int last_avoid_back_to_back_offset = -1; |
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1213 #ifdef ASSERT |
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1214 uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1215 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1216 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1217 uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); |
| 3851 | 1218 #endif |
|
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1219 |
| 0 | 1220 // Create an array of unused labels, one for each basic block, if printing is enabled |
| 1221 #ifndef PRODUCT | |
| 1222 int *node_offsets = NULL; | |
| 3851 | 1223 uint node_offset_limit = unique(); |
| 1224 | |
| 1225 if (print_assembly()) | |
| 0 | 1226 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit); |
| 1227 #endif | |
| 1228 | |
| 1229 NonSafepointEmitter non_safepoints(this); // emit non-safepoints lazily | |
| 1230 | |
| 2008 | 1231 // Emit the constant table. |
| 1232 if (has_mach_constant_base_node()) { | |
| 1233 constant_table().emit(*cb); | |
| 1234 } | |
| 1235 | |
| 3851 | 1236 // Create an array of labels, one for each basic block |
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1237 Label *blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1); |
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1238 for (uint i=0; i <= nblocks; i++) { |
| 3851 | 1239 blk_labels[i].init(); |
| 1240 } | |
| 1241 | |
| 0 | 1242 // ------------------ |
| 1243 // Now fill in the code buffer | |
| 1244 Node *delay_slot = NULL; | |
| 1245 | |
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1246 for (uint i = 0; i < nblocks; i++) { |
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1247 Block* block = _cfg->get_block(i); |
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1248 Node* head = block->head(); |
| 0 | 1249 |
| 1250 // If this block needs to start aligned (i.e, can be reached other | |
| 1251 // than by falling-thru from the previous block), then force the | |
| 1252 // start of a new bundle. | |
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1253 if (Pipeline::requires_bundling() && starts_bundle(head)) { |
| 0 | 1254 cb->flush_bundle(true); |
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1255 } |
| 0 | 1256 |
| 3851 | 1257 #ifdef ASSERT |
|
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1258 if (!block->is_connector()) { |
| 3851 | 1259 stringStream st; |
|
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1260 block->dump_head(_cfg, &st); |
| 3851 | 1261 MacroAssembler(cb).block_comment(st.as_string()); |
| 1262 } | |
|
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1263 jmp_target[i] = 0; |
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1264 jmp_offset[i] = 0; |
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1265 jmp_size[i] = 0; |
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1266 jmp_rule[i] = 0; |
| 3851 | 1267 #endif |
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1268 int blk_offset = current_offset; |
| 3851 | 1269 |
| 0 | 1270 // Define the label at the beginning of the basic block |
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1271 MacroAssembler(cb).bind(blk_labels[block->_pre_order]); |
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1272 |
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1273 uint last_inst = block->number_of_nodes(); |
| 0 | 1274 |
| 1275 // Emit block normally, except for last instruction. | |
| 1276 // Emit means "dump code bits into code buffer". | |
| 3851 | 1277 for (uint j = 0; j<last_inst; j++) { |
| 0 | 1278 |
| 1279 // Get the node | |
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1280 Node* n = block->get_node(j); |
| 0 | 1281 |
| 1282 // See if delay slots are supported | |
| 1283 if (valid_bundle_info(n) && | |
| 1284 node_bundling(n)->used_in_unconditional_delay()) { | |
| 1285 assert(delay_slot == NULL, "no use of delay slot node"); | |
| 1286 assert(n->size(_regalloc) == Pipeline::instr_unit_size(), "delay slot instruction wrong size"); | |
| 1287 | |
| 1288 delay_slot = n; | |
| 1289 continue; | |
| 1290 } | |
| 1291 | |
| 1292 // If this starts a new instruction group, then flush the current one | |
| 1293 // (but allow split bundles) | |
| 3851 | 1294 if (Pipeline::requires_bundling() && starts_bundle(n)) |
| 0 | 1295 cb->flush_bundle(false); |
| 1296 | |
| 1297 // The following logic is duplicated in the code ifdeffed for | |
| 605 | 1298 // ENABLE_ZAP_DEAD_LOCALS which appears above in this file. It |
| 0 | 1299 // should be factored out. Or maybe dispersed to the nodes? |
| 1300 | |
| 1301 // Special handling for SafePoint/Call Nodes | |
| 1302 bool is_mcall = false; | |
| 3851 | 1303 if (n->is_Mach()) { |
| 0 | 1304 MachNode *mach = n->as_Mach(); |
| 1305 is_mcall = n->is_MachCall(); | |
| 1306 bool is_sfn = n->is_MachSafePoint(); | |
| 1307 | |
| 1308 // If this requires all previous instructions be flushed, then do so | |
| 3851 | 1309 if (is_sfn || is_mcall || mach->alignment_required() != 1) { |
| 0 | 1310 cb->flush_bundle(true); |
| 1748 | 1311 current_offset = cb->insts_size(); |
| 0 | 1312 } |
| 1313 | |
| 3851 | 1314 // A padding may be needed again since a previous instruction |
| 1315 // could be moved to delay slot. | |
| 1316 | |
| 0 | 1317 // align the instruction if necessary |
| 1318 int padding = mach->compute_padding(current_offset); | |
| 1319 // Make sure safepoint node for polling is distinct from a call's | |
| 1320 // return by adding a nop if needed. | |
| 3851 | 1321 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) { |
| 0 | 1322 padding = nop_size; |
| 1323 } | |
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1324 if (padding == 0 && mach->avoid_back_to_back(MachNode::AVOID_BEFORE) && |
| 3851 | 1325 current_offset == last_avoid_back_to_back_offset) { |
| 1326 // Avoid back to back some instructions. | |
| 1327 padding = nop_size; | |
| 0 | 1328 } |
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1329 |
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1330 if(padding > 0) { |
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1331 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); |
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1332 int nops_cnt = padding / nop_size; |
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1333 MachNode *nop = new (this) MachNopNode(nops_cnt); |
|
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1334 block->insert_node(nop, j++); |
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1335 last_inst++; |
|
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1336 _cfg->map_node_to_block(nop, block); |
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1337 nop->emit(*cb, _regalloc); |
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1338 cb->flush_bundle(true); |
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1339 current_offset = cb->insts_size(); |
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1340 } |
|
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1341 |
| 0 | 1342 // Remember the start of the last call in a basic block |
| 1343 if (is_mcall) { | |
| 1344 MachCallNode *mcall = mach->as_MachCall(); | |
| 1345 | |
| 1346 // This destination address is NOT PC-relative | |
| 1347 mcall->method_set((intptr_t)mcall->entry_point()); | |
| 1348 | |
| 1349 // Save the return address | |
|
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1350 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset(); |
| 0 | 1351 |
| 3842 | 1352 if (mcall->is_MachCallLeaf()) { |
| 0 | 1353 is_mcall = false; |
| 1354 is_sfn = false; | |
| 1355 } | |
| 1356 } | |
| 1357 | |
| 1358 // sfn will be valid whenever mcall is valid now because of inheritance | |
| 3851 | 1359 if (is_sfn || is_mcall) { |
| 0 | 1360 |
| 1361 // Handle special safepoint nodes for synchronization | |
| 3851 | 1362 if (!is_mcall) { |
| 0 | 1363 MachSafePointNode *sfn = mach->as_MachSafePoint(); |
| 1364 // !!!!! Stubs only need an oopmap right now, so bail out | |
| 3851 | 1365 if (sfn->jvms()->method() == NULL) { |
| 0 | 1366 // Write the oopmap directly to the code blob??!! |
| 1367 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 1368 assert( !is_node_getting_a_safepoint(sfn), "logic does not match; false positive"); | |
| 1369 # endif | |
| 1370 continue; | |
| 1371 } | |
| 1372 } // End synchronization | |
| 1373 | |
| 1374 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
| 1375 current_offset); | |
| 1376 Process_OopMap_Node(mach, current_offset); | |
| 1377 } // End if safepoint | |
| 1378 | |
| 1379 // If this is a null check, then add the start of the previous instruction to the list | |
| 1380 else if( mach->is_MachNullCheck() ) { | |
| 1381 inct_starts[inct_cnt++] = previous_offset; | |
| 1382 } | |
| 1383 | |
| 1384 // If this is a branch, then fill in the label with the target BB's label | |
|
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1385 else if (mach->is_MachBranch()) { |
|
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1386 // This requires the TRUE branch target be in succs[0] |
|
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1387 uint block_num = block->non_connector_successor(0)->_pre_order; |
|
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1388 |
|
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1389 // Try to replace long branch if delay slot is not used, |
|
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1390 // it is mostly for back branches since forward branch's |
|
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1391 // distance is not updated yet. |
|
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1392 bool delay_slot_is_used = valid_bundle_info(n) && |
|
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1393 node_bundling(n)->use_unconditional_delay(); |
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1394 if (!delay_slot_is_used && mach->may_be_short_branch()) { |
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1395 assert(delay_slot == NULL, "not expecting delay slot node"); |
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1396 int br_size = n->size(_regalloc); |
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1397 int offset = blk_starts[block_num] - current_offset; |
|
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1398 if (block_num >= i) { |
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1399 // Current and following block's offset are not |
|
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1400 // finalized yet, adjust distance by the difference |
|
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1401 // between calculated and final offsets of current block. |
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1402 offset -= (blk_starts[i] - blk_offset); |
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1403 } |
|
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1404 // In the following code a nop could be inserted before |
|
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1405 // the branch which will increase the backward distance. |
|
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1406 bool needs_padding = (current_offset == last_avoid_back_to_back_offset); |
|
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1407 if (needs_padding && offset <= 0) |
|
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1408 offset -= nop_size; |
|
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1409 |
|
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1410 if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) { |
|
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1411 // We've got a winner. Replace this branch. |
|
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1412 MachNode* replacement = mach->as_MachBranch()->short_branch_version(this); |
|
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1413 |
|
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1414 // Update the jmp_size. |
|
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1415 int new_size = replacement->size(_regalloc); |
|
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1416 assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller"); |
|
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1417 // Insert padding between avoid_back_to_back branches. |
|
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1418 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) { |
|
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1419 MachNode *nop = new (this) MachNopNode(); |
|
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1420 block->insert_node(nop, j++); |
|
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1421 _cfg->map_node_to_block(nop, block); |
|
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1422 last_inst++; |
|
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1423 nop->emit(*cb, _regalloc); |
|
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1424 cb->flush_bundle(true); |
|
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1425 current_offset = cb->insts_size(); |
|
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1426 } |
|
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1427 #ifdef ASSERT |
|
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1428 jmp_target[i] = block_num; |
|
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1429 jmp_offset[i] = current_offset - blk_offset; |
|
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1430 jmp_size[i] = new_size; |
|
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1431 jmp_rule[i] = mach->rule(); |
|
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1432 #endif |
|
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1433 block->map_node(replacement, j); |
|
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1434 mach->subsume_by(replacement, C); |
|
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1435 n = replacement; |
|
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1436 mach = replacement; |
|
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1437 } |
|
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1438 } |
|
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1439 mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num ); |
|
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1440 } else if (mach->ideal_Opcode() == Op_Jump) { |
|
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1441 for (uint h = 0; h < block->_num_succs; h++) { |
|
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1442 Block* succs_block = block->_succs[h]; |
|
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1443 for (uint j = 1; j < succs_block->num_preds(); j++) { |
|
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1444 Node* jpn = succs_block->pred(j); |
|
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1445 if (jpn->is_JumpProj() && jpn->in(0) == mach) { |
|
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1446 uint block_num = succs_block->non_connector()->_pre_order; |
|
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1447 Label *blkLabel = &blk_labels[block_num]; |
|
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1448 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel); |
| 0 | 1449 } |
| 1450 } | |
| 1451 } | |
| 1452 } | |
| 1453 #ifdef ASSERT | |
| 605 | 1454 // Check that oop-store precedes the card-mark |
| 3851 | 1455 else if (mach->ideal_Opcode() == Op_StoreCM) { |
| 0 | 1456 uint storeCM_idx = j; |
|
3248
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1457 int count = 0; |
|
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1458 for (uint prec = mach->req(); prec < mach->len(); prec++) { |
|
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1459 Node *oop_store = mach->in(prec); // Precedence edge |
|
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1460 if (oop_store == NULL) continue; |
|
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|
1461 count++; |
|
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|
1462 uint i4; |
|
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1463 for (i4 = 0; i4 < last_inst; ++i4) { |
|
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1464 if (block->get_node(i4) == oop_store) { |
|
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1465 break; |
|
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1466 } |
|
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1467 } |
|
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1468 // Note: This test can provide a false failure if other precedence |
|
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1469 // edges have been added to the storeCMNode. |
|
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1470 assert(i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store"); |
| 0 | 1471 } |
|
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1472 assert(count > 0, "storeCM expects at least one precedence edge"); |
| 0 | 1473 } |
| 1474 #endif | |
| 3851 | 1475 else if (!n->is_Proj()) { |
| 605 | 1476 // Remember the beginning of the previous instruction, in case |
| 0 | 1477 // it's followed by a flag-kill and a null-check. Happens on |
| 1478 // Intel all the time, with add-to-memory kind of opcodes. | |
| 1479 previous_offset = current_offset; | |
| 1480 } | |
|
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1481 |
|
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1482 // Not an else-if! |
|
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1483 // If this is a trap based cmp then add its offset to the list. |
|
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1484 if (mach->is_TrapBasedCheckNode()) { |
|
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1485 inct_starts[inct_cnt++] = current_offset; |
|
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1486 } |
| 0 | 1487 } |
| 1488 | |
| 1489 // Verify that there is sufficient space remaining | |
| 1490 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size); | |
| 1202 | 1491 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
|
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1492 C->record_failure("CodeCache is full"); |
| 0 | 1493 return; |
| 1494 } | |
| 1495 | |
| 1496 // Save the offset for the listing | |
| 1497 #ifndef PRODUCT | |
| 3851 | 1498 if (node_offsets && n->_idx < node_offset_limit) |
| 1748 | 1499 node_offsets[n->_idx] = cb->insts_size(); |
| 0 | 1500 #endif |
| 1501 | |
| 1502 // "Normal" instruction case | |
| 3851 | 1503 DEBUG_ONLY( uint instr_offset = cb->insts_size(); ) |
| 0 | 1504 n->emit(*cb, _regalloc); |
| 1748 | 1505 current_offset = cb->insts_size(); |
| 3851 | 1506 |
| 1507 #ifdef ASSERT | |
|
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1508 if (n->size(_regalloc) < (current_offset-instr_offset)) { |
| 3851 | 1509 n->dump(); |
|
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1510 assert(false, "wrong size of mach node"); |
| 3851 | 1511 } |
| 1512 #endif | |
| 0 | 1513 non_safepoints.observe_instruction(n, current_offset); |
| 1514 | |
| 1515 // mcall is last "call" that can be a safepoint | |
| 1516 // record it so we can see if a poll will directly follow it | |
| 1517 // in which case we'll need a pad to make the PcDesc sites unique | |
| 1518 // see 5010568. This can be slightly inaccurate but conservative | |
| 1519 // in the case that return address is not actually at current_offset. | |
| 1520 // This is a small price to pay. | |
| 1521 | |
| 1522 if (is_mcall) { | |
| 1523 last_call_offset = current_offset; | |
| 1524 } | |
| 1525 | |
|
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|
1526 if (n->is_Mach() && n->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) { |
| 3851 | 1527 // Avoid back to back some instructions. |
| 1528 last_avoid_back_to_back_offset = current_offset; | |
| 1529 } | |
| 1530 | |
| 0 | 1531 // See if this instruction has a delay slot |
| 3851 | 1532 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { |
| 0 | 1533 assert(delay_slot != NULL, "expecting delay slot node"); |
| 1534 | |
| 1535 // Back up 1 instruction | |
| 1748 | 1536 cb->set_insts_end(cb->insts_end() - Pipeline::instr_unit_size()); |
| 0 | 1537 |
| 1538 // Save the offset for the listing | |
| 1539 #ifndef PRODUCT | |
| 3851 | 1540 if (node_offsets && delay_slot->_idx < node_offset_limit) |
| 1748 | 1541 node_offsets[delay_slot->_idx] = cb->insts_size(); |
| 0 | 1542 #endif |
| 1543 | |
| 1544 // Support a SafePoint in the delay slot | |
| 3851 | 1545 if (delay_slot->is_MachSafePoint()) { |
| 0 | 1546 MachNode *mach = delay_slot->as_Mach(); |
| 1547 // !!!!! Stubs only need an oopmap right now, so bail out | |
| 3851 | 1548 if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL) { |
| 0 | 1549 // Write the oopmap directly to the code blob??!! |
| 1550 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 1551 assert( !is_node_getting_a_safepoint(mach), "logic does not match; false positive"); | |
| 1552 # endif | |
| 1553 delay_slot = NULL; | |
| 1554 continue; | |
| 1555 } | |
| 1556 | |
| 1557 int adjusted_offset = current_offset - Pipeline::instr_unit_size(); | |
| 1558 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
| 1559 adjusted_offset); | |
| 1560 // Generate an OopMap entry | |
| 1561 Process_OopMap_Node(mach, adjusted_offset); | |
| 1562 } | |
| 1563 | |
| 1564 // Insert the delay slot instruction | |
| 1565 delay_slot->emit(*cb, _regalloc); | |
| 1566 | |
| 1567 // Don't reuse it | |
| 1568 delay_slot = NULL; | |
| 1569 } | |
| 1570 | |
| 1571 } // End for all instructions in block | |
|
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1572 |
| 418 | 1573 // If the next block is the top of a loop, pad this block out to align |
| 1574 // the loop top a little. Helps prevent pipe stalls at loop back branches. | |
|
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1575 if (i < nblocks-1) { |
|
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1576 Block *nb = _cfg->get_block(i + 1); |
|
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1577 int padding = nb->alignment_padding(current_offset); |
|
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1578 if( padding > 0 ) { |
|
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1579 MachNode *nop = new (this) MachNopNode(padding / nop_size); |
|
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1580 block->insert_node(nop, block->number_of_nodes()); |
|
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1581 _cfg->map_node_to_block(nop, block); |
|
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1582 nop->emit(*cb, _regalloc); |
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1583 current_offset = cb->insts_size(); |
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1584 } |
| 0 | 1585 } |
|
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1586 // Verify that the distance for generated before forward |
|
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1587 // short branches is still valid. |
|
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1588 guarantee((int)(blk_starts[i+1] - blk_starts[i]) >= (current_offset - blk_offset), "shouldn't increase block size"); |
|
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1589 |
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1590 // Save new block start offset |
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1591 blk_starts[i] = blk_offset; |
| 0 | 1592 } // End of for all blocks |
|
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1593 blk_starts[nblocks] = current_offset; |
| 0 | 1594 |
| 1595 non_safepoints.flush_at_end(); | |
| 1596 | |
| 1597 // Offset too large? | |
| 1598 if (failing()) return; | |
| 1599 | |
| 1600 // Define a pseudo-label at the end of the code | |
|
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1601 MacroAssembler(cb).bind( blk_labels[nblocks] ); |
| 0 | 1602 |
| 1603 // Compute the size of the first block | |
| 1604 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos(); | |
| 1605 | |
| 1748 | 1606 assert(cb->insts_size() < 500000, "method is unreasonably large"); |
| 0 | 1607 |
|
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1608 #ifdef ASSERT |
|
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1609 for (uint i = 0; i < nblocks; i++) { // For all blocks |
|
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1610 if (jmp_target[i] != 0) { |
|
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1611 int br_size = jmp_size[i]; |
|
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1612 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]); |
|
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1613 if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) { |
|
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1614 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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1615 assert(false, "Displacement too large for short jmp"); |
|
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1616 } |
|
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|
1617 } |
|
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|
1618 } |
|
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|
1619 #endif |
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1620 |
| 0 | 1621 #ifndef PRODUCT |
| 1622 // Information on the size of the method, without the extraneous code | |
| 1748 | 1623 Scheduling::increment_method_size(cb->insts_size()); |
| 0 | 1624 #endif |
| 1625 | |
| 1626 // ------------------ | |
| 1627 // Fill in exception table entries. | |
| 1628 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels); | |
| 1629 | |
| 1630 // Only java methods have exception handlers and deopt handlers | |
|
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1631 // class HandlerImpl is platform-specific and defined in the *.ad files. |
| 0 | 1632 if (_method) { |
| 1633 // Emit the exception handler code. | |
|
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|
1634 _code_offsets.set_value(CodeOffsets::Exceptions, HandlerImpl::emit_exception_handler(*cb)); |
| 0 | 1635 // Emit the deopt handler code. |
|
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1636 _code_offsets.set_value(CodeOffsets::Deopt, HandlerImpl::emit_deopt_handler(*cb)); |
| 1265 | 1637 |
| 1638 // Emit the MethodHandle deopt handler code (if required). | |
| 1639 if (has_method_handle_invokes()) { | |
| 1640 // We can use the same code as for the normal deopt handler, we | |
| 1641 // just need a different entry point address. | |
|
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|
1642 _code_offsets.set_value(CodeOffsets::DeoptMH, HandlerImpl::emit_deopt_handler(*cb)); |
| 1265 | 1643 } |
| 0 | 1644 } |
| 1645 | |
| 1646 // One last check for failed CodeBuffer::expand: | |
| 1202 | 1647 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
|
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|
1648 C->record_failure("CodeCache is full"); |
| 0 | 1649 return; |
| 1650 } | |
| 1651 | |
| 1652 #ifndef PRODUCT | |
| 1653 // Dump the assembly code, including basic-block numbers | |
| 1654 if (print_assembly()) { | |
| 1655 ttyLocker ttyl; // keep the following output all in one block | |
| 1656 if (!VMThread::should_terminate()) { // test this under the tty lock | |
| 1657 // This output goes directly to the tty, not the compiler log. | |
| 1658 // To enable tools to match it up with the compilation activity, | |
| 1659 // be sure to tag this tty output with the compile ID. | |
| 1660 if (xtty != NULL) { | |
| 1661 xtty->head("opto_assembly compile_id='%d'%s", compile_id(), | |
| 1662 is_osr_compilation() ? " compile_kind='osr'" : | |
| 1663 ""); | |
| 1664 } | |
| 1665 if (method() != NULL) { | |
|
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|
1666 method()->print_metadata(); |
| 0 | 1667 } |
| 1668 dump_asm(node_offsets, node_offset_limit); | |
| 1669 if (xtty != NULL) { | |
| 1670 xtty->tail("opto_assembly"); | |
| 1671 } | |
| 1672 } | |
| 1673 } | |
| 1674 #endif | |
| 1675 | |
| 1676 } | |
| 1677 | |
| 1678 void Compile::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) { | |
| 1679 _inc_table.set_size(cnt); | |
| 1680 | |
| 1681 uint inct_cnt = 0; | |
|
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1682 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
|
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|
1683 Block* block = _cfg->get_block(i); |
| 0 | 1684 Node *n = NULL; |
| 1685 int j; | |
| 1686 | |
| 1687 // Find the branch; ignore trailing NOPs. | |
|
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|
1688 for (j = block->number_of_nodes() - 1; j >= 0; j--) { |
|
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|
1689 n = block->get_node(j); |
|
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1690 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) { |
| 0 | 1691 break; |
|
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|
1692 } |
| 0 | 1693 } |
| 1694 | |
| 1695 // If we didn't find anything, continue | |
|
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1696 if (j < 0) { |
|
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|
1697 continue; |
|
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|
1698 } |
| 0 | 1699 |
| 1700 // Compute ExceptionHandlerTable subtable entry and add it | |
| 1701 // (skip empty blocks) | |
|
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1702 if (n->is_Catch()) { |
| 0 | 1703 |
| 1704 // Get the offset of the return from the call | |
|
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1705 uint call_return = call_returns[block->_pre_order]; |
| 0 | 1706 #ifdef ASSERT |
| 1707 assert( call_return > 0, "no call seen for this basic block" ); | |
|
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1708 while (block->get_node(--j)->is_MachProj()) ; |
|
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|
1709 assert(block->get_node(j)->is_MachCall(), "CatchProj must follow call"); |
| 0 | 1710 #endif |
| 1711 // last instruction is a CatchNode, find it's CatchProjNodes | |
|
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|
1712 int nof_succs = block->_num_succs; |
| 0 | 1713 // allocate space |
| 1714 GrowableArray<intptr_t> handler_bcis(nof_succs); | |
| 1715 GrowableArray<intptr_t> handler_pcos(nof_succs); | |
| 1716 // iterate through all successors | |
| 1717 for (int j = 0; j < nof_succs; j++) { | |
|
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|
1718 Block* s = block->_succs[j]; |
| 0 | 1719 bool found_p = false; |
|
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|
1720 for (uint k = 1; k < s->num_preds(); k++) { |
|
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1721 Node* pk = s->pred(k); |
|
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|
1722 if (pk->is_CatchProj() && pk->in(0) == n) { |
| 0 | 1723 const CatchProjNode* p = pk->as_CatchProj(); |
| 1724 found_p = true; | |
| 1725 // add the corresponding handler bci & pco information | |
|
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|
1726 if (p->_con != CatchProjNode::fall_through_index) { |
| 0 | 1727 // p leads to an exception handler (and is not fall through) |
|
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|
1728 assert(s == _cfg->get_block(s->_pre_order), "bad numbering"); |
| 0 | 1729 // no duplicates, please |
|
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|
1730 if (!handler_bcis.contains(p->handler_bci())) { |
| 0 | 1731 uint block_num = s->non_connector()->_pre_order; |
| 1732 handler_bcis.append(p->handler_bci()); | |
| 1733 handler_pcos.append(blk_labels[block_num].loc_pos()); | |
| 1734 } | |
| 1735 } | |
| 1736 } | |
| 1737 } | |
| 1738 assert(found_p, "no matching predecessor found"); | |
| 1739 // Note: Due to empty block removal, one block may have | |
| 1740 // several CatchProj inputs, from the same Catch. | |
| 1741 } | |
| 1742 | |
| 1743 // Set the offset of the return from the call | |
| 1744 _handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos); | |
| 1745 continue; | |
| 1746 } | |
| 1747 | |
| 1748 // Handle implicit null exception table updates | |
|
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|
1749 if (n->is_MachNullCheck()) { |
|
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|
1750 uint block_num = block->non_connector_successor(0)->_pre_order; |
|
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|
1751 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos()); |
| 0 | 1752 continue; |
| 1753 } | |
|
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|
1754 // Handle implicit exception table updates: trap instructions. |
|
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|
1755 if (n->is_Mach() && n->as_Mach()->is_TrapBasedCheckNode()) { |
|
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|
1756 uint block_num = block->non_connector_successor(0)->_pre_order; |
|
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|
1757 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos()); |
|
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|
1758 continue; |
|
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|
1759 } |
| 0 | 1760 } // End of for all blocks fill in exception table entries |
| 1761 } | |
| 1762 | |
| 1763 // Static Variables | |
| 1764 #ifndef PRODUCT | |
| 1765 uint Scheduling::_total_nop_size = 0; | |
| 1766 uint Scheduling::_total_method_size = 0; | |
| 1767 uint Scheduling::_total_branches = 0; | |
| 1768 uint Scheduling::_total_unconditional_delays = 0; | |
| 1769 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1]; | |
| 1770 #endif | |
| 1771 | |
| 1772 // Initializer for class Scheduling | |
| 1773 | |
| 1774 Scheduling::Scheduling(Arena *arena, Compile &compile) | |
| 1775 : _arena(arena), | |
| 1776 _cfg(compile.cfg()), | |
| 1777 _regalloc(compile.regalloc()), | |
| 1778 _reg_node(arena), | |
| 1779 _bundle_instr_count(0), | |
| 1780 _bundle_cycle_number(0), | |
| 1781 _scheduled(arena), | |
| 1782 _available(arena), | |
| 1783 _next_node(NULL), | |
| 1784 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0]), | |
| 1785 _pinch_free_list(arena) | |
| 1786 #ifndef PRODUCT | |
| 1787 , _branches(0) | |
| 1788 , _unconditional_delays(0) | |
| 1789 #endif | |
| 1790 { | |
| 1791 // Create a MachNopNode | |
| 1792 _nop = new (&compile) MachNopNode(); | |
| 1793 | |
| 1794 // Now that the nops are in the array, save the count | |
| 1795 // (but allow entries for the nops) | |
| 1796 _node_bundling_limit = compile.unique(); | |
| 1797 uint node_max = _regalloc->node_regs_max_index(); | |
| 1798 | |
| 1799 compile.set_node_bundling_limit(_node_bundling_limit); | |
| 1800 | |
| 605 | 1801 // This one is persistent within the Compile class |
| 0 | 1802 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max); |
| 1803 | |
| 1804 // Allocate space for fixed-size arrays | |
| 1805 _node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
| 1806 _uses = NEW_ARENA_ARRAY(arena, short, node_max); | |
| 1807 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
| 1808 | |
| 1809 // Clear the arrays | |
| 1810 memset(_node_bundling_base, 0, node_max * sizeof(Bundle)); | |
| 1811 memset(_node_latency, 0, node_max * sizeof(unsigned short)); | |
| 1812 memset(_uses, 0, node_max * sizeof(short)); | |
| 1813 memset(_current_latency, 0, node_max * sizeof(unsigned short)); | |
| 1814 | |
| 1815 // Clear the bundling information | |
|
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1816 memcpy(_bundle_use_elements, Pipeline_Use::elaborated_elements, sizeof(Pipeline_Use::elaborated_elements)); |
| 0 | 1817 |
| 1818 // Get the last node | |
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1819 Block* block = _cfg->get_block(_cfg->number_of_blocks() - 1); |
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1820 |
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1821 _next_node = block->get_node(block->number_of_nodes() - 1); |
| 0 | 1822 } |
| 1823 | |
| 1824 #ifndef PRODUCT | |
| 1825 // Scheduling destructor | |
| 1826 Scheduling::~Scheduling() { | |
| 1827 _total_branches += _branches; | |
| 1828 _total_unconditional_delays += _unconditional_delays; | |
| 1829 } | |
| 1830 #endif | |
| 1831 | |
| 1832 // Step ahead "i" cycles | |
| 1833 void Scheduling::step(uint i) { | |
| 1834 | |
| 1835 Bundle *bundle = node_bundling(_next_node); | |
| 1836 bundle->set_starts_bundle(); | |
| 1837 | |
| 1838 // Update the bundle record, but leave the flags information alone | |
| 1839 if (_bundle_instr_count > 0) { | |
| 1840 bundle->set_instr_count(_bundle_instr_count); | |
| 1841 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
| 1842 } | |
| 1843 | |
| 1844 // Update the state information | |
| 1845 _bundle_instr_count = 0; | |
| 1846 _bundle_cycle_number += i; | |
| 1847 _bundle_use.step(i); | |
| 1848 } | |
| 1849 | |
| 1850 void Scheduling::step_and_clear() { | |
| 1851 Bundle *bundle = node_bundling(_next_node); | |
| 1852 bundle->set_starts_bundle(); | |
| 1853 | |
| 1854 // Update the bundle record | |
| 1855 if (_bundle_instr_count > 0) { | |
| 1856 bundle->set_instr_count(_bundle_instr_count); | |
| 1857 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
| 1858 | |
| 1859 _bundle_cycle_number += 1; | |
| 1860 } | |
| 1861 | |
| 1862 // Clear the bundling information | |
| 1863 _bundle_instr_count = 0; | |
| 1864 _bundle_use.reset(); | |
| 1865 | |
| 1866 memcpy(_bundle_use_elements, | |
| 1867 Pipeline_Use::elaborated_elements, | |
| 1868 sizeof(Pipeline_Use::elaborated_elements)); | |
| 1869 } | |
| 1870 | |
| 1871 // Perform instruction scheduling and bundling over the sequence of | |
| 1872 // instructions in backwards order. | |
| 1873 void Compile::ScheduleAndBundle() { | |
| 1874 | |
| 1875 // Don't optimize this if it isn't a method | |
| 1876 if (!_method) | |
| 1877 return; | |
| 1878 | |
| 1879 // Don't optimize this if scheduling is disabled | |
| 1880 if (!do_scheduling()) | |
| 1881 return; | |
| 1882 | |
|
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1883 // Scheduling code works only with pairs (8 bytes) maximum. |
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1884 if (max_vector_size() > 8) |
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1885 return; |
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1886 |
| 0 | 1887 NOT_PRODUCT( TracePhase t2("isched", &_t_instrSched, TimeCompiler); ) |
| 1888 | |
| 1889 // Create a data structure for all the scheduling information | |
| 1890 Scheduling scheduling(Thread::current()->resource_area(), *this); | |
| 1891 | |
| 1892 // Walk backwards over each basic block, computing the needed alignment | |
| 1893 // Walk over all the basic blocks | |
| 1894 scheduling.DoScheduling(); | |
| 1895 } | |
| 1896 | |
| 1897 // Compute the latency of all the instructions. This is fairly simple, | |
| 1898 // because we already have a legal ordering. Walk over the instructions | |
| 1899 // from first to last, and compute the latency of the instruction based | |
| 605 | 1900 // on the latency of the preceding instruction(s). |
| 0 | 1901 void Scheduling::ComputeLocalLatenciesForward(const Block *bb) { |
| 1902 #ifndef PRODUCT | |
| 1903 if (_cfg->C->trace_opto_output()) | |
| 1904 tty->print("# -> ComputeLocalLatenciesForward\n"); | |
| 1905 #endif | |
| 1906 | |
| 1907 // Walk over all the schedulable instructions | |
| 1908 for( uint j=_bb_start; j < _bb_end; j++ ) { | |
| 1909 | |
| 1910 // This is a kludge, forcing all latency calculations to start at 1. | |
| 1911 // Used to allow latency 0 to force an instruction to the beginning | |
| 1912 // of the bb | |
| 1913 uint latency = 1; | |
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1914 Node *use = bb->get_node(j); |
| 0 | 1915 uint nlen = use->len(); |
| 1916 | |
| 1917 // Walk over all the inputs | |
| 1918 for ( uint k=0; k < nlen; k++ ) { | |
| 1919 Node *def = use->in(k); | |
| 1920 if (!def) | |
| 1921 continue; | |
| 1922 | |
| 1923 uint l = _node_latency[def->_idx] + use->latency(k); | |
| 1924 if (latency < l) | |
| 1925 latency = l; | |
| 1926 } | |
| 1927 | |
| 1928 _node_latency[use->_idx] = latency; | |
| 1929 | |
| 1930 #ifndef PRODUCT | |
| 1931 if (_cfg->C->trace_opto_output()) { | |
| 1932 tty->print("# latency %4d: ", latency); | |
| 1933 use->dump(); | |
| 1934 } | |
| 1935 #endif | |
| 1936 } | |
| 1937 | |
| 1938 #ifndef PRODUCT | |
| 1939 if (_cfg->C->trace_opto_output()) | |
| 1940 tty->print("# <- ComputeLocalLatenciesForward\n"); | |
| 1941 #endif | |
| 1942 | |
| 1943 } // end ComputeLocalLatenciesForward | |
| 1944 | |
| 1945 // See if this node fits into the present instruction bundle | |
| 1946 bool Scheduling::NodeFitsInBundle(Node *n) { | |
| 1947 uint n_idx = n->_idx; | |
| 1948 | |
| 1949 // If this is the unconditional delay instruction, then it fits | |
| 1950 if (n == _unconditional_delay_slot) { | |
| 1951 #ifndef PRODUCT | |
| 1952 if (_cfg->C->trace_opto_output()) | |
| 1953 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx); | |
| 1954 #endif | |
| 1955 return (true); | |
| 1956 } | |
| 1957 | |
| 1958 // If the node cannot be scheduled this cycle, skip it | |
| 1959 if (_current_latency[n_idx] > _bundle_cycle_number) { | |
| 1960 #ifndef PRODUCT | |
| 1961 if (_cfg->C->trace_opto_output()) | |
| 1962 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n", | |
| 1963 n->_idx, _current_latency[n_idx], _bundle_cycle_number); | |
| 1964 #endif | |
| 1965 return (false); | |
| 1966 } | |
| 1967 | |
| 1968 const Pipeline *node_pipeline = n->pipeline(); | |
| 1969 | |
| 1970 uint instruction_count = node_pipeline->instructionCount(); | |
| 1971 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
| 1972 instruction_count = 0; | |
| 1973 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
| 1974 instruction_count++; | |
| 1975 | |
| 1976 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) { | |
| 1977 #ifndef PRODUCT | |
| 1978 if (_cfg->C->trace_opto_output()) | |
| 1979 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n", | |
| 1980 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle); | |
| 1981 #endif | |
| 1982 return (false); | |
| 1983 } | |
| 1984 | |
| 1985 // Don't allow non-machine nodes to be handled this way | |
| 1986 if (!n->is_Mach() && instruction_count == 0) | |
| 1987 return (false); | |
| 1988 | |
| 1989 // See if there is any overlap | |
| 1990 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse()); | |
| 1991 | |
| 1992 if (delay > 0) { | |
| 1993 #ifndef PRODUCT | |
| 1994 if (_cfg->C->trace_opto_output()) | |
| 1995 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx); | |
| 1996 #endif | |
| 1997 return false; | |
| 1998 } | |
| 1999 | |
| 2000 #ifndef PRODUCT | |
| 2001 if (_cfg->C->trace_opto_output()) | |
| 2002 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx); | |
| 2003 #endif | |
| 2004 | |
| 2005 return true; | |
| 2006 } | |
| 2007 | |
| 2008 Node * Scheduling::ChooseNodeToBundle() { | |
| 2009 uint siz = _available.size(); | |
| 2010 | |
| 2011 if (siz == 0) { | |
| 2012 | |
| 2013 #ifndef PRODUCT | |
| 2014 if (_cfg->C->trace_opto_output()) | |
| 2015 tty->print("# ChooseNodeToBundle: NULL\n"); | |
| 2016 #endif | |
| 2017 return (NULL); | |
| 2018 } | |
| 2019 | |
| 2020 // Fast path, if only 1 instruction in the bundle | |
| 2021 if (siz == 1) { | |
| 2022 #ifndef PRODUCT | |
| 2023 if (_cfg->C->trace_opto_output()) { | |
| 2024 tty->print("# ChooseNodeToBundle (only 1): "); | |
| 2025 _available[0]->dump(); | |
| 2026 } | |
| 2027 #endif | |
| 2028 return (_available[0]); | |
| 2029 } | |
| 2030 | |
| 2031 // Don't bother, if the bundle is already full | |
| 2032 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) { | |
| 2033 for ( uint i = 0; i < siz; i++ ) { | |
| 2034 Node *n = _available[i]; | |
| 2035 | |
| 2036 // Skip projections, we'll handle them another way | |
| 2037 if (n->is_Proj()) | |
| 2038 continue; | |
| 2039 | |
| 2040 // This presupposed that instructions are inserted into the | |
| 2041 // available list in a legality order; i.e. instructions that | |
| 2042 // must be inserted first are at the head of the list | |
| 2043 if (NodeFitsInBundle(n)) { | |
| 2044 #ifndef PRODUCT | |
| 2045 if (_cfg->C->trace_opto_output()) { | |
| 2046 tty->print("# ChooseNodeToBundle: "); | |
| 2047 n->dump(); | |
| 2048 } | |
| 2049 #endif | |
| 2050 return (n); | |
| 2051 } | |
| 2052 } | |
| 2053 } | |
| 2054 | |
| 2055 // Nothing fits in this bundle, choose the highest priority | |
| 2056 #ifndef PRODUCT | |
| 2057 if (_cfg->C->trace_opto_output()) { | |
| 2058 tty->print("# ChooseNodeToBundle: "); | |
| 2059 _available[0]->dump(); | |
| 2060 } | |
| 2061 #endif | |
| 2062 | |
| 2063 return _available[0]; | |
| 2064 } | |
| 2065 | |
| 2066 void Scheduling::AddNodeToAvailableList(Node *n) { | |
| 2067 assert( !n->is_Proj(), "projections never directly made available" ); | |
| 2068 #ifndef PRODUCT | |
| 2069 if (_cfg->C->trace_opto_output()) { | |
| 2070 tty->print("# AddNodeToAvailableList: "); | |
| 2071 n->dump(); | |
| 2072 } | |
| 2073 #endif | |
| 2074 | |
| 2075 int latency = _current_latency[n->_idx]; | |
| 2076 | |
| 2077 // Insert in latency order (insertion sort) | |
| 2078 uint i; | |
| 2079 for ( i=0; i < _available.size(); i++ ) | |
| 2080 if (_current_latency[_available[i]->_idx] > latency) | |
| 2081 break; | |
| 2082 | |
| 2083 // Special Check for compares following branches | |
| 2084 if( n->is_Mach() && _scheduled.size() > 0 ) { | |
| 2085 int op = n->as_Mach()->ideal_Opcode(); | |
| 2086 Node *last = _scheduled[0]; | |
| 2087 if( last->is_MachIf() && last->in(1) == n && | |
| 2088 ( op == Op_CmpI || | |
| 2089 op == Op_CmpU || | |
| 2090 op == Op_CmpP || | |
| 2091 op == Op_CmpF || | |
| 2092 op == Op_CmpD || | |
| 2093 op == Op_CmpL ) ) { | |
| 2094 | |
| 2095 // Recalculate position, moving to front of same latency | |
| 2096 for ( i=0 ; i < _available.size(); i++ ) | |
| 2097 if (_current_latency[_available[i]->_idx] >= latency) | |
| 2098 break; | |
| 2099 } | |
| 2100 } | |
| 2101 | |
| 2102 // Insert the node in the available list | |
| 2103 _available.insert(i, n); | |
| 2104 | |
| 2105 #ifndef PRODUCT | |
| 2106 if (_cfg->C->trace_opto_output()) | |
| 2107 dump_available(); | |
| 2108 #endif | |
| 2109 } | |
| 2110 | |
| 2111 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) { | |
| 2112 for ( uint i=0; i < n->len(); i++ ) { | |
| 2113 Node *def = n->in(i); | |
| 2114 if (!def) continue; | |
| 2115 if( def->is_Proj() ) // If this is a machine projection, then | |
| 2116 def = def->in(0); // propagate usage thru to the base instruction | |
| 2117 | |
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2118 if(_cfg->get_block_for_node(def) != bb) { // Ignore if not block-local |
| 0 | 2119 continue; |
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2120 } |
| 0 | 2121 |
| 2122 // Compute the latency | |
| 2123 uint l = _bundle_cycle_number + n->latency(i); | |
| 2124 if (_current_latency[def->_idx] < l) | |
| 2125 _current_latency[def->_idx] = l; | |
| 2126 | |
| 2127 // If this does not have uses then schedule it | |
| 2128 if ((--_uses[def->_idx]) == 0) | |
| 2129 AddNodeToAvailableList(def); | |
| 2130 } | |
| 2131 } | |
| 2132 | |
| 2133 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) { | |
| 2134 #ifndef PRODUCT | |
| 2135 if (_cfg->C->trace_opto_output()) { | |
| 2136 tty->print("# AddNodeToBundle: "); | |
| 2137 n->dump(); | |
| 2138 } | |
| 2139 #endif | |
| 2140 | |
| 2141 // Remove this from the available list | |
| 2142 uint i; | |
| 2143 for (i = 0; i < _available.size(); i++) | |
| 2144 if (_available[i] == n) | |
| 2145 break; | |
| 2146 assert(i < _available.size(), "entry in _available list not found"); | |
| 2147 _available.remove(i); | |
| 2148 | |
| 2149 // See if this fits in the current bundle | |
| 2150 const Pipeline *node_pipeline = n->pipeline(); | |
| 2151 const Pipeline_Use& node_usage = node_pipeline->resourceUse(); | |
| 2152 | |
| 2153 // Check for instructions to be placed in the delay slot. We | |
| 2154 // do this before we actually schedule the current instruction, | |
| 2155 // because the delay slot follows the current instruction. | |
| 2156 if (Pipeline::_branch_has_delay_slot && | |
| 2157 node_pipeline->hasBranchDelay() && | |
| 2158 !_unconditional_delay_slot) { | |
| 2159 | |
| 2160 uint siz = _available.size(); | |
| 2161 | |
| 2162 // Conditional branches can support an instruction that | |
| 605 | 2163 // is unconditionally executed and not dependent by the |
| 0 | 2164 // branch, OR a conditionally executed instruction if |
| 2165 // the branch is taken. In practice, this means that | |
| 2166 // the first instruction at the branch target is | |
| 2167 // copied to the delay slot, and the branch goes to | |
| 2168 // the instruction after that at the branch target | |
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2169 if ( n->is_MachBranch() ) { |
| 0 | 2170 |
| 2171 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" ); | |
| 2172 assert( !n->is_Catch(), "should not look for delay slot for Catch" ); | |
| 2173 | |
| 2174 #ifndef PRODUCT | |
| 2175 _branches++; | |
| 2176 #endif | |
| 2177 | |
| 2178 // At least 1 instruction is on the available list | |
| 605 | 2179 // that is not dependent on the branch |
| 0 | 2180 for (uint i = 0; i < siz; i++) { |
| 2181 Node *d = _available[i]; | |
| 2182 const Pipeline *avail_pipeline = d->pipeline(); | |
| 2183 | |
| 2184 // Don't allow safepoints in the branch shadow, that will | |
| 2185 // cause a number of difficulties | |
| 2186 if ( avail_pipeline->instructionCount() == 1 && | |
| 2187 !avail_pipeline->hasMultipleBundles() && | |
| 2188 !avail_pipeline->hasBranchDelay() && | |
| 2189 Pipeline::instr_has_unit_size() && | |
| 2190 d->size(_regalloc) == Pipeline::instr_unit_size() && | |
| 2191 NodeFitsInBundle(d) && | |
| 2192 !node_bundling(d)->used_in_delay()) { | |
| 2193 | |
| 2194 if (d->is_Mach() && !d->is_MachSafePoint()) { | |
| 2195 // A node that fits in the delay slot was found, so we need to | |
| 2196 // set the appropriate bits in the bundle pipeline information so | |
| 2197 // that it correctly indicates resource usage. Later, when we | |
| 2198 // attempt to add this instruction to the bundle, we will skip | |
| 2199 // setting the resource usage. | |
| 2200 _unconditional_delay_slot = d; | |
| 2201 node_bundling(n)->set_use_unconditional_delay(); | |
| 2202 node_bundling(d)->set_used_in_unconditional_delay(); | |
| 2203 _bundle_use.add_usage(avail_pipeline->resourceUse()); | |
| 2204 _current_latency[d->_idx] = _bundle_cycle_number; | |
| 2205 _next_node = d; | |
| 2206 ++_bundle_instr_count; | |
| 2207 #ifndef PRODUCT | |
| 2208 _unconditional_delays++; | |
| 2209 #endif | |
| 2210 break; | |
| 2211 } | |
| 2212 } | |
| 2213 } | |
| 2214 } | |
| 2215 | |
| 2216 // No delay slot, add a nop to the usage | |
| 2217 if (!_unconditional_delay_slot) { | |
| 2218 // See if adding an instruction in the delay slot will overflow | |
| 2219 // the bundle. | |
| 2220 if (!NodeFitsInBundle(_nop)) { | |
| 2221 #ifndef PRODUCT | |
| 2222 if (_cfg->C->trace_opto_output()) | |
| 2223 tty->print("# *** STEP(1 instruction for delay slot) ***\n"); | |
| 2224 #endif | |
| 2225 step(1); | |
| 2226 } | |
| 2227 | |
| 2228 _bundle_use.add_usage(_nop->pipeline()->resourceUse()); | |
| 2229 _next_node = _nop; | |
| 2230 ++_bundle_instr_count; | |
| 2231 } | |
| 2232 | |
| 2233 // See if the instruction in the delay slot requires a | |
| 2234 // step of the bundles | |
| 2235 if (!NodeFitsInBundle(n)) { | |
| 2236 #ifndef PRODUCT | |
| 2237 if (_cfg->C->trace_opto_output()) | |
| 2238 tty->print("# *** STEP(branch won't fit) ***\n"); | |
| 2239 #endif | |
| 2240 // Update the state information | |
| 2241 _bundle_instr_count = 0; | |
| 2242 _bundle_cycle_number += 1; | |
| 2243 _bundle_use.step(1); | |
| 2244 } | |
| 2245 } | |
| 2246 | |
| 2247 // Get the number of instructions | |
| 2248 uint instruction_count = node_pipeline->instructionCount(); | |
| 2249 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
| 2250 instruction_count = 0; | |
| 2251 | |
| 2252 // Compute the latency information | |
| 2253 uint delay = 0; | |
| 2254 | |
| 2255 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) { | |
| 2256 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number; | |
| 2257 if (relative_latency < 0) | |
| 2258 relative_latency = 0; | |
| 2259 | |
| 2260 delay = _bundle_use.full_latency(relative_latency, node_usage); | |
| 2261 | |
| 2262 // Does not fit in this bundle, start a new one | |
| 2263 if (delay > 0) { | |
| 2264 step(delay); | |
| 2265 | |
| 2266 #ifndef PRODUCT | |
| 2267 if (_cfg->C->trace_opto_output()) | |
| 2268 tty->print("# *** STEP(%d) ***\n", delay); | |
| 2269 #endif | |
| 2270 } | |
| 2271 } | |
| 2272 | |
| 2273 // If this was placed in the delay slot, ignore it | |
| 2274 if (n != _unconditional_delay_slot) { | |
| 2275 | |
| 2276 if (delay == 0) { | |
| 2277 if (node_pipeline->hasMultipleBundles()) { | |
| 2278 #ifndef PRODUCT | |
| 2279 if (_cfg->C->trace_opto_output()) | |
| 2280 tty->print("# *** STEP(multiple instructions) ***\n"); | |
| 2281 #endif | |
| 2282 step(1); | |
| 2283 } | |
| 2284 | |
| 2285 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) { | |
| 2286 #ifndef PRODUCT | |
| 2287 if (_cfg->C->trace_opto_output()) | |
| 2288 tty->print("# *** STEP(%d >= %d instructions) ***\n", | |
| 2289 instruction_count + _bundle_instr_count, | |
| 2290 Pipeline::_max_instrs_per_cycle); | |
| 2291 #endif | |
| 2292 step(1); | |
| 2293 } | |
| 2294 } | |
| 2295 | |
| 2296 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
| 2297 _bundle_instr_count++; | |
| 2298 | |
| 2299 // Set the node's latency | |
| 2300 _current_latency[n->_idx] = _bundle_cycle_number; | |
| 2301 | |
| 2302 // Now merge the functional unit information | |
| 2303 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) | |
| 2304 _bundle_use.add_usage(node_usage); | |
| 2305 | |
| 2306 // Increment the number of instructions in this bundle | |
| 2307 _bundle_instr_count += instruction_count; | |
| 2308 | |
| 2309 // Remember this node for later | |
| 2310 if (n->is_Mach()) | |
| 2311 _next_node = n; | |
| 2312 } | |
| 2313 | |
| 2314 // It's possible to have a BoxLock in the graph and in the _bbs mapping but | |
| 2315 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks. | |
| 2316 // 'Schedule' them (basically ignore in the schedule) but do not insert them | |
| 2317 // into the block. All other scheduled nodes get put in the schedule here. | |
| 2318 int op = n->Opcode(); | |
| 2319 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR | |
| 2320 (op != Op_Node && // Not an unused antidepedence node and | |
| 2321 // not an unallocated boxlock | |
| 2322 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) { | |
| 2323 | |
| 2324 // Push any trailing projections | |
|
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2325 if( bb->get_node(bb->number_of_nodes()-1) != n ) { |
| 0 | 2326 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
| 2327 Node *foi = n->fast_out(i); | |
| 2328 if( foi->is_Proj() ) | |
| 2329 _scheduled.push(foi); | |
| 2330 } | |
| 2331 } | |
| 2332 | |
| 2333 // Put the instruction in the schedule list | |
| 2334 _scheduled.push(n); | |
| 2335 } | |
| 2336 | |
| 2337 #ifndef PRODUCT | |
| 2338 if (_cfg->C->trace_opto_output()) | |
| 2339 dump_available(); | |
| 2340 #endif | |
| 2341 | |
| 2342 // Walk all the definitions, decrementing use counts, and | |
| 2343 // if a definition has a 0 use count, place it in the available list. | |
| 2344 DecrementUseCounts(n,bb); | |
| 2345 } | |
| 2346 | |
| 2347 // This method sets the use count within a basic block. We will ignore all | |
| 2348 // uses outside the current basic block. As we are doing a backwards walk, | |
| 2349 // any node we reach that has a use count of 0 may be scheduled. This also | |
| 2350 // avoids the problem of cyclic references from phi nodes, as long as phi | |
| 2351 // nodes are at the front of the basic block. This method also initializes | |
| 2352 // the available list to the set of instructions that have no uses within this | |
| 2353 // basic block. | |
| 2354 void Scheduling::ComputeUseCount(const Block *bb) { | |
| 2355 #ifndef PRODUCT | |
| 2356 if (_cfg->C->trace_opto_output()) | |
| 2357 tty->print("# -> ComputeUseCount\n"); | |
| 2358 #endif | |
| 2359 | |
| 2360 // Clear the list of available and scheduled instructions, just in case | |
| 2361 _available.clear(); | |
| 2362 _scheduled.clear(); | |
| 2363 | |
| 2364 // No delay slot specified | |
| 2365 _unconditional_delay_slot = NULL; | |
| 2366 | |
| 2367 #ifdef ASSERT | |
|
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2368 for( uint i=0; i < bb->number_of_nodes(); i++ ) |
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2369 assert( _uses[bb->get_node(i)->_idx] == 0, "_use array not clean" ); |
| 0 | 2370 #endif |
| 2371 | |
| 2372 // Force the _uses count to never go to zero for unscheduable pieces | |
| 2373 // of the block | |
| 2374 for( uint k = 0; k < _bb_start; k++ ) | |
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2375 _uses[bb->get_node(k)->_idx] = 1; |
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2376 for( uint l = _bb_end; l < bb->number_of_nodes(); l++ ) |
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2377 _uses[bb->get_node(l)->_idx] = 1; |
| 0 | 2378 |
| 2379 // Iterate backwards over the instructions in the block. Don't count the | |
| 2380 // branch projections at end or the block header instructions. | |
| 2381 for( uint j = _bb_end-1; j >= _bb_start; j-- ) { | |
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2382 Node *n = bb->get_node(j); |
| 0 | 2383 if( n->is_Proj() ) continue; // Projections handled another way |
| 2384 | |
| 2385 // Account for all uses | |
| 2386 for ( uint k = 0; k < n->len(); k++ ) { | |
| 2387 Node *inp = n->in(k); | |
| 2388 if (!inp) continue; | |
| 2389 assert(inp != n, "no cycles allowed" ); | |
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2390 if (_cfg->get_block_for_node(inp) == bb) { // Block-local use? |
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2391 if (inp->is_Proj()) { // Skip through Proj's |
| 0 | 2392 inp = inp->in(0); |
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2393 } |
| 0 | 2394 ++_uses[inp->_idx]; // Count 1 block-local use |
| 2395 } | |
| 2396 } | |
| 2397 | |
| 2398 // If this instruction has a 0 use count, then it is available | |
| 2399 if (!_uses[n->_idx]) { | |
| 2400 _current_latency[n->_idx] = _bundle_cycle_number; | |
| 2401 AddNodeToAvailableList(n); | |
| 2402 } | |
| 2403 | |
| 2404 #ifndef PRODUCT | |
| 2405 if (_cfg->C->trace_opto_output()) { | |
| 2406 tty->print("# uses: %3d: ", _uses[n->_idx]); | |
| 2407 n->dump(); | |
| 2408 } | |
| 2409 #endif | |
| 2410 } | |
| 2411 | |
| 2412 #ifndef PRODUCT | |
| 2413 if (_cfg->C->trace_opto_output()) | |
| 2414 tty->print("# <- ComputeUseCount\n"); | |
| 2415 #endif | |
| 2416 } | |
| 2417 | |
| 2418 // This routine performs scheduling on each basic block in reverse order, | |
| 2419 // using instruction latencies and taking into account function unit | |
| 2420 // availability. | |
| 2421 void Scheduling::DoScheduling() { | |
| 2422 #ifndef PRODUCT | |
| 2423 if (_cfg->C->trace_opto_output()) | |
| 2424 tty->print("# -> DoScheduling\n"); | |
| 2425 #endif | |
| 2426 | |
| 2427 Block *succ_bb = NULL; | |
| 2428 Block *bb; | |
| 2429 | |
| 2430 // Walk over all the basic blocks in reverse order | |
|
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2431 for (int i = _cfg->number_of_blocks() - 1; i >= 0; succ_bb = bb, i--) { |
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2432 bb = _cfg->get_block(i); |
| 0 | 2433 |
| 2434 #ifndef PRODUCT | |
| 2435 if (_cfg->C->trace_opto_output()) { | |
| 2436 tty->print("# Schedule BB#%03d (initial)\n", i); | |
|
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2437 for (uint j = 0; j < bb->number_of_nodes(); j++) { |
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2438 bb->get_node(j)->dump(); |
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2439 } |
| 0 | 2440 } |
| 2441 #endif | |
| 2442 | |
| 2443 // On the head node, skip processing | |
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2444 if (bb == _cfg->get_root_block()) { |
| 0 | 2445 continue; |
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2446 } |
| 0 | 2447 |
| 2448 // Skip empty, connector blocks | |
| 2449 if (bb->is_connector()) | |
| 2450 continue; | |
| 2451 | |
| 2452 // If the following block is not the sole successor of | |
| 2453 // this one, then reset the pipeline information | |
| 2454 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) { | |
| 2455 #ifndef PRODUCT | |
| 2456 if (_cfg->C->trace_opto_output()) { | |
| 2457 tty->print("*** bundle start of next BB, node %d, for %d instructions\n", | |
| 2458 _next_node->_idx, _bundle_instr_count); | |
| 2459 } | |
| 2460 #endif | |
| 2461 step_and_clear(); | |
| 2462 } | |
| 2463 | |
| 2464 // Leave untouched the starting instruction, any Phis, a CreateEx node | |
|
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2465 // or Top. bb->get_node(_bb_start) is the first schedulable instruction. |
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2466 _bb_end = bb->number_of_nodes()-1; |
| 0 | 2467 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) { |
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2468 Node *n = bb->get_node(_bb_start); |
| 0 | 2469 // Things not matched, like Phinodes and ProjNodes don't get scheduled. |
| 2470 // Also, MachIdealNodes do not get scheduled | |
| 2471 if( !n->is_Mach() ) continue; // Skip non-machine nodes | |
| 2472 MachNode *mach = n->as_Mach(); | |
| 2473 int iop = mach->ideal_Opcode(); | |
| 2474 if( iop == Op_CreateEx ) continue; // CreateEx is pinned | |
| 2475 if( iop == Op_Con ) continue; // Do not schedule Top | |
| 2476 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes | |
| 2477 mach->pipeline() == MachNode::pipeline_class() && | |
| 2478 !n->is_SpillCopy() ) // Breakpoints, Prolog, etc | |
| 2479 continue; | |
| 2480 break; // Funny loop structure to be sure... | |
| 2481 } | |
| 2482 // Compute last "interesting" instruction in block - last instruction we | |
| 2483 // might schedule. _bb_end points just after last schedulable inst. We | |
| 2484 // normally schedule conditional branches (despite them being forced last | |
| 2485 // in the block), because they have delay slots we can fill. Calls all | |
| 2486 // have their delay slots filled in the template expansions, so we don't | |
| 2487 // bother scheduling them. | |
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2488 Node *last = bb->get_node(_bb_end); |
| 3851 | 2489 // Ignore trailing NOPs. |
| 2490 while (_bb_end > 0 && last->is_Mach() && | |
| 2491 last->as_Mach()->ideal_Opcode() == Op_Con) { | |
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2492 last = bb->get_node(--_bb_end); |
| 3851 | 2493 } |
| 2494 assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, ""); | |
| 0 | 2495 if( last->is_Catch() || |
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2496 // Exclude unreachable path case when Halt node is in a separate block. |
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2497 (_bb_end > 1 && last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) { |
| 0 | 2498 // There must be a prior call. Skip it. |
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2499 while( !bb->get_node(--_bb_end)->is_MachCall() ) { |
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2500 assert( bb->get_node(_bb_end)->is_MachProj(), "skipping projections after expected call" ); |
| 0 | 2501 } |
| 2502 } else if( last->is_MachNullCheck() ) { | |
| 2503 // Backup so the last null-checked memory instruction is | |
| 2504 // outside the schedulable range. Skip over the nullcheck, | |
| 2505 // projection, and the memory nodes. | |
| 2506 Node *mem = last->in(1); | |
| 2507 do { | |
| 2508 _bb_end--; | |
|
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2509 } while (mem != bb->get_node(_bb_end)); |
| 0 | 2510 } else { |
| 2511 // Set _bb_end to point after last schedulable inst. | |
| 2512 _bb_end++; | |
| 2513 } | |
| 2514 | |
| 2515 assert( _bb_start <= _bb_end, "inverted block ends" ); | |
| 2516 | |
| 2517 // Compute the register antidependencies for the basic block | |
| 2518 ComputeRegisterAntidependencies(bb); | |
| 2519 if (_cfg->C->failing()) return; // too many D-U pinch points | |
| 2520 | |
| 2521 // Compute intra-bb latencies for the nodes | |
| 2522 ComputeLocalLatenciesForward(bb); | |
| 2523 | |
| 2524 // Compute the usage within the block, and set the list of all nodes | |
| 2525 // in the block that have no uses within the block. | |
| 2526 ComputeUseCount(bb); | |
| 2527 | |
| 2528 // Schedule the remaining instructions in the block | |
| 2529 while ( _available.size() > 0 ) { | |
| 2530 Node *n = ChooseNodeToBundle(); | |
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2531 guarantee(n != NULL, "no nodes available"); |
| 0 | 2532 AddNodeToBundle(n,bb); |
| 2533 } | |
| 2534 | |
| 2535 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" ); | |
| 2536 #ifdef ASSERT | |
| 2537 for( uint l = _bb_start; l < _bb_end; l++ ) { | |
|
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2538 Node *n = bb->get_node(l); |
| 0 | 2539 uint m; |
| 2540 for( m = 0; m < _bb_end-_bb_start; m++ ) | |
| 2541 if( _scheduled[m] == n ) | |
| 2542 break; | |
| 2543 assert( m < _bb_end-_bb_start, "instruction missing in schedule" ); | |
| 2544 } | |
| 2545 #endif | |
| 2546 | |
| 2547 // Now copy the instructions (in reverse order) back to the block | |
| 2548 for ( uint k = _bb_start; k < _bb_end; k++ ) | |
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2549 bb->map_node(_scheduled[_bb_end-k-1], k); |
| 0 | 2550 |
| 2551 #ifndef PRODUCT | |
| 2552 if (_cfg->C->trace_opto_output()) { | |
| 2553 tty->print("# Schedule BB#%03d (final)\n", i); | |
| 2554 uint current = 0; | |
|
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2555 for (uint j = 0; j < bb->number_of_nodes(); j++) { |
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2556 Node *n = bb->get_node(j); |
| 0 | 2557 if( valid_bundle_info(n) ) { |
| 2558 Bundle *bundle = node_bundling(n); | |
| 2559 if (bundle->instr_count() > 0 || bundle->flags() > 0) { | |
| 2560 tty->print("*** Bundle: "); | |
| 2561 bundle->dump(); | |
| 2562 } | |
| 2563 n->dump(); | |
| 2564 } | |
| 2565 } | |
| 2566 } | |
| 2567 #endif | |
| 2568 #ifdef ASSERT | |
| 2569 verify_good_schedule(bb,"after block local scheduling"); | |
| 2570 #endif | |
| 2571 } | |
| 2572 | |
| 2573 #ifndef PRODUCT | |
| 2574 if (_cfg->C->trace_opto_output()) | |
| 2575 tty->print("# <- DoScheduling\n"); | |
| 2576 #endif | |
| 2577 | |
| 2578 // Record final node-bundling array location | |
| 2579 _regalloc->C->set_node_bundling_base(_node_bundling_base); | |
| 2580 | |
| 2581 } // end DoScheduling | |
| 2582 | |
| 2583 // Verify that no live-range used in the block is killed in the block by a | |
| 2584 // wrong DEF. This doesn't verify live-ranges that span blocks. | |
| 2585 | |
| 2586 // Check for edge existence. Used to avoid adding redundant precedence edges. | |
| 2587 static bool edge_from_to( Node *from, Node *to ) { | |
| 2588 for( uint i=0; i<from->len(); i++ ) | |
| 2589 if( from->in(i) == to ) | |
| 2590 return true; | |
| 2591 return false; | |
| 2592 } | |
| 2593 | |
| 2594 #ifdef ASSERT | |
| 2595 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) { | |
| 2596 // Check for bad kills | |
| 2597 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow | |
| 2598 Node *prior_use = _reg_node[def]; | |
| 2599 if( prior_use && !edge_from_to(prior_use,n) ) { | |
| 2600 tty->print("%s = ",OptoReg::as_VMReg(def)->name()); | |
| 2601 n->dump(); | |
| 2602 tty->print_cr("..."); | |
| 2603 prior_use->dump(); | |
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2604 assert(edge_from_to(prior_use,n),msg); |
| 0 | 2605 } |
| 2606 _reg_node.map(def,NULL); // Kill live USEs | |
| 2607 } | |
| 2608 } | |
| 2609 | |
| 2610 void Scheduling::verify_good_schedule( Block *b, const char *msg ) { | |
| 2611 | |
| 2612 // Zap to something reasonable for the verify code | |
| 2613 _reg_node.clear(); | |
| 2614 | |
| 2615 // Walk over the block backwards. Check to make sure each DEF doesn't | |
| 2616 // kill a live value (other than the one it's supposed to). Add each | |
| 2617 // USE to the live set. | |
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2618 for( uint i = b->number_of_nodes()-1; i >= _bb_start; i-- ) { |
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2619 Node *n = b->get_node(i); |
| 0 | 2620 int n_op = n->Opcode(); |
| 2621 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
| 2622 // Fat-proj kills a slew of registers | |
| 2623 RegMask rm = n->out_RegMask();// Make local copy | |
| 2624 while( rm.is_NotEmpty() ) { | |
| 2625 OptoReg::Name kill = rm.find_first_elem(); | |
| 2626 rm.Remove(kill); | |
| 2627 verify_do_def( n, kill, msg ); | |
| 2628 } | |
| 2629 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes | |
| 2630 // Get DEF'd registers the normal way | |
| 2631 verify_do_def( n, _regalloc->get_reg_first(n), msg ); | |
| 2632 verify_do_def( n, _regalloc->get_reg_second(n), msg ); | |
| 2633 } | |
| 2634 | |
| 2635 // Now make all USEs live | |
| 2636 for( uint i=1; i<n->req(); i++ ) { | |
| 2637 Node *def = n->in(i); | |
| 2638 assert(def != 0, "input edge required"); | |
| 2639 OptoReg::Name reg_lo = _regalloc->get_reg_first(def); | |
| 2640 OptoReg::Name reg_hi = _regalloc->get_reg_second(def); | |
| 2641 if( OptoReg::is_valid(reg_lo) ) { | |
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2642 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), msg); |
| 0 | 2643 _reg_node.map(reg_lo,n); |
| 2644 } | |
| 2645 if( OptoReg::is_valid(reg_hi) ) { | |
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2646 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), msg); |
| 0 | 2647 _reg_node.map(reg_hi,n); |
| 2648 } | |
| 2649 } | |
| 2650 | |
| 2651 } | |
| 2652 | |
| 2653 // Zap to something reasonable for the Antidependence code | |
| 2654 _reg_node.clear(); | |
| 2655 } | |
| 2656 #endif | |
| 2657 | |
| 2658 // Conditionally add precedence edges. Avoid putting edges on Projs. | |
| 2659 static void add_prec_edge_from_to( Node *from, Node *to ) { | |
| 2660 if( from->is_Proj() ) { // Put precedence edge on Proj's input | |
| 2661 assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" ); | |
| 2662 from = from->in(0); | |
| 2663 } | |
| 2664 if( from != to && // No cycles (for things like LD L0,[L0+4] ) | |
| 2665 !edge_from_to( from, to ) ) // Avoid duplicate edge | |
| 2666 from->add_prec(to); | |
| 2667 } | |
| 2668 | |
| 2669 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) { | |
| 2670 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow | |
| 2671 return; | |
| 2672 | |
| 2673 Node *pinch = _reg_node[def_reg]; // Get pinch point | |
|
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2674 if ((pinch == NULL) || _cfg->get_block_for_node(pinch) != b || // No pinch-point yet? |
| 0 | 2675 is_def ) { // Check for a true def (not a kill) |
| 2676 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point | |
| 2677 return; | |
| 2678 } | |
| 2679 | |
| 2680 Node *kill = def; // Rename 'def' to more descriptive 'kill' | |
| 2681 debug_only( def = (Node*)0xdeadbeef; ) | |
| 2682 | |
| 2683 // After some number of kills there _may_ be a later def | |
| 2684 Node *later_def = NULL; | |
| 2685 | |
| 2686 // Finding a kill requires a real pinch-point. | |
| 2687 // Check for not already having a pinch-point. | |
| 2688 // Pinch points are Op_Node's. | |
| 2689 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point? | |
| 2690 later_def = pinch; // Must be def/kill as optimistic pinch-point | |
| 2691 if ( _pinch_free_list.size() > 0) { | |
| 2692 pinch = _pinch_free_list.pop(); | |
| 2693 } else { | |
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2694 pinch = new (_cfg->C) Node(1); // Pinch point to-be |
| 0 | 2695 } |
| 2696 if (pinch->_idx >= _regalloc->node_regs_max_index()) { | |
| 2697 _cfg->C->record_method_not_compilable("too many D-U pinch points"); | |
| 2698 return; | |
| 2699 } | |
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2700 _cfg->map_node_to_block(pinch, b); // Pretend it's valid in this block (lazy init) |
| 0 | 2701 _reg_node.map(def_reg,pinch); // Record pinch-point |
| 2702 //_regalloc->set_bad(pinch->_idx); // Already initialized this way. | |
| 2703 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill | |
| 2704 pinch->init_req(0, _cfg->C->top()); // set not NULL for the next call | |
| 2705 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch | |
| 2706 later_def = NULL; // and no later def | |
| 2707 } | |
| 2708 pinch->set_req(0,later_def); // Hook later def so we can find it | |
| 2709 } else { // Else have valid pinch point | |
| 2710 if( pinch->in(0) ) // If there is a later-def | |
| 2711 later_def = pinch->in(0); // Get it | |
| 2712 } | |
| 2713 | |
| 2714 // Add output-dependence edge from later def to kill | |
| 2715 if( later_def ) // If there is some original def | |
| 2716 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill | |
| 2717 | |
| 2718 // See if current kill is also a use, and so is forced to be the pinch-point. | |
| 2719 if( pinch->Opcode() == Op_Node ) { | |
| 2720 Node *uses = kill->is_Proj() ? kill->in(0) : kill; | |
| 2721 for( uint i=1; i<uses->req(); i++ ) { | |
| 2722 if( _regalloc->get_reg_first(uses->in(i)) == def_reg || | |
| 2723 _regalloc->get_reg_second(uses->in(i)) == def_reg ) { | |
| 2724 // Yes, found a use/kill pinch-point | |
| 2725 pinch->set_req(0,NULL); // | |
| 2726 pinch->replace_by(kill); // Move anti-dep edges up | |
| 2727 pinch = kill; | |
| 2728 _reg_node.map(def_reg,pinch); | |
| 2729 return; | |
| 2730 } | |
| 2731 } | |
| 2732 } | |
| 2733 | |
| 2734 // Add edge from kill to pinch-point | |
| 2735 add_prec_edge_from_to(kill,pinch); | |
| 2736 } | |
| 2737 | |
| 2738 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) { | |
| 2739 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow | |
| 2740 return; | |
| 2741 Node *pinch = _reg_node[use_reg]; // Get pinch point | |
| 2742 // Check for no later def_reg/kill in block | |
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2743 if ((pinch != NULL) && _cfg->get_block_for_node(pinch) == b && |
| 0 | 2744 // Use has to be block-local as well |
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2745 _cfg->get_block_for_node(use) == b) { |
| 0 | 2746 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?) |
| 2747 pinch->req() == 1 ) { // pinch not yet in block? | |
| 2748 pinch->del_req(0); // yank pointer to later-def, also set flag | |
| 2749 // Insert the pinch-point in the block just after the last use | |
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2750 b->insert_node(pinch, b->find_node(use) + 1); |
| 0 | 2751 _bb_end++; // Increase size scheduled region in block |
| 2752 } | |
| 2753 | |
| 2754 add_prec_edge_from_to(pinch,use); | |
| 2755 } | |
| 2756 } | |
| 2757 | |
| 2758 // We insert antidependences between the reads and following write of | |
| 2759 // allocated registers to prevent illegal code motion. Hopefully, the | |
| 2760 // number of added references should be fairly small, especially as we | |
| 2761 // are only adding references within the current basic block. | |
| 2762 void Scheduling::ComputeRegisterAntidependencies(Block *b) { | |
| 2763 | |
| 2764 #ifdef ASSERT | |
| 2765 verify_good_schedule(b,"before block local scheduling"); | |
| 2766 #endif | |
| 2767 | |
| 2768 // A valid schedule, for each register independently, is an endless cycle | |
| 2769 // of: a def, then some uses (connected to the def by true dependencies), | |
| 2770 // then some kills (defs with no uses), finally the cycle repeats with a new | |
| 2771 // def. The uses are allowed to float relative to each other, as are the | |
| 2772 // kills. No use is allowed to slide past a kill (or def). This requires | |
| 2773 // antidependencies between all uses of a single def and all kills that | |
| 2774 // follow, up to the next def. More edges are redundant, because later defs | |
| 2775 // & kills are already serialized with true or antidependencies. To keep | |
| 2776 // the edge count down, we add a 'pinch point' node if there's more than | |
| 2777 // one use or more than one kill/def. | |
| 2778 | |
| 2779 // We add dependencies in one bottom-up pass. | |
| 2780 | |
| 2781 // For each instruction we handle it's DEFs/KILLs, then it's USEs. | |
| 2782 | |
| 2783 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this | |
| 2784 // register. If not, we record the DEF/KILL in _reg_node, the | |
| 2785 // register-to-def mapping. If there is a prior DEF/KILL, we insert a | |
| 2786 // "pinch point", a new Node that's in the graph but not in the block. | |
| 2787 // We put edges from the prior and current DEF/KILLs to the pinch point. | |
| 2788 // We put the pinch point in _reg_node. If there's already a pinch point | |
| 2789 // we merely add an edge from the current DEF/KILL to the pinch point. | |
| 2790 | |
| 2791 // After doing the DEF/KILLs, we handle USEs. For each used register, we | |
| 2792 // put an edge from the pinch point to the USE. | |
| 2793 | |
| 2794 // To be expedient, the _reg_node array is pre-allocated for the whole | |
| 2795 // compilation. _reg_node is lazily initialized; it either contains a NULL, | |
| 2796 // or a valid def/kill/pinch-point, or a leftover node from some prior | |
| 2797 // block. Leftover node from some prior block is treated like a NULL (no | |
| 2798 // prior def, so no anti-dependence needed). Valid def is distinguished by | |
| 2799 // it being in the current block. | |
| 2800 bool fat_proj_seen = false; | |
| 2801 uint last_safept = _bb_end-1; | |
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2802 Node* end_node = (_bb_end-1 >= _bb_start) ? b->get_node(last_safept) : NULL; |
| 0 | 2803 Node* last_safept_node = end_node; |
| 2804 for( uint i = _bb_end-1; i >= _bb_start; i-- ) { | |
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2805 Node *n = b->get_node(i); |
| 0 | 2806 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges |
| 3842 | 2807 if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) { |
| 0 | 2808 // Fat-proj kills a slew of registers |
| 2809 // This can add edges to 'n' and obscure whether or not it was a def, | |
| 2810 // hence the is_def flag. | |
| 2811 fat_proj_seen = true; | |
| 2812 RegMask rm = n->out_RegMask();// Make local copy | |
| 2813 while( rm.is_NotEmpty() ) { | |
| 2814 OptoReg::Name kill = rm.find_first_elem(); | |
| 2815 rm.Remove(kill); | |
| 2816 anti_do_def( b, n, kill, is_def ); | |
| 2817 } | |
| 2818 } else { | |
| 2819 // Get DEF'd registers the normal way | |
| 2820 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def ); | |
| 2821 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def ); | |
| 2822 } | |
| 2823 | |
| 3851 | 2824 // Kill projections on a branch should appear to occur on the |
| 2825 // branch, not afterwards, so grab the masks from the projections | |
| 2826 // and process them. | |
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2827 if (n->is_MachBranch() || n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump) { |
| 3851 | 2828 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
| 2829 Node* use = n->fast_out(i); | |
| 2830 if (use->is_Proj()) { | |
| 2831 RegMask rm = use->out_RegMask();// Make local copy | |
| 2832 while( rm.is_NotEmpty() ) { | |
| 2833 OptoReg::Name kill = rm.find_first_elem(); | |
| 2834 rm.Remove(kill); | |
| 2835 anti_do_def( b, n, kill, false ); | |
| 2836 } | |
| 2837 } | |
| 2838 } | |
| 2839 } | |
| 2840 | |
| 0 | 2841 // Check each register used by this instruction for a following DEF/KILL |
| 2842 // that must occur afterward and requires an anti-dependence edge. | |
| 2843 for( uint j=0; j<n->req(); j++ ) { | |
| 2844 Node *def = n->in(j); | |
| 2845 if( def ) { | |
| 3842 | 2846 assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" ); |
| 0 | 2847 anti_do_use( b, n, _regalloc->get_reg_first(def) ); |
| 2848 anti_do_use( b, n, _regalloc->get_reg_second(def) ); | |
| 2849 } | |
| 2850 } | |
| 2851 // Do not allow defs of new derived values to float above GC | |
| 2852 // points unless the base is definitely available at the GC point. | |
| 2853 | |
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2854 Node *m = b->get_node(i); |
| 0 | 2855 |
| 2856 // Add precedence edge from following safepoint to use of derived pointer | |
| 2857 if( last_safept_node != end_node && | |
| 2858 m != last_safept_node) { | |
| 2859 for (uint k = 1; k < m->req(); k++) { | |
| 2860 const Type *t = m->in(k)->bottom_type(); | |
| 2861 if( t->isa_oop_ptr() && | |
| 2862 t->is_ptr()->offset() != 0 ) { | |
| 2863 last_safept_node->add_prec( m ); | |
| 2864 break; | |
| 2865 } | |
| 2866 } | |
| 2867 } | |
| 2868 | |
| 2869 if( n->jvms() ) { // Precedence edge from derived to safept | |
| 2870 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use() | |
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2871 if( b->get_node(last_safept) != last_safept_node ) { |
| 0 | 2872 last_safept = b->find_node(last_safept_node); |
| 2873 } | |
| 2874 for( uint j=last_safept; j > i; j-- ) { | |
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2875 Node *mach = b->get_node(j); |
| 0 | 2876 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP ) |
| 2877 mach->add_prec( n ); | |
| 2878 } | |
| 2879 last_safept = i; | |
| 2880 last_safept_node = m; | |
| 2881 } | |
| 2882 } | |
| 2883 | |
| 2884 if (fat_proj_seen) { | |
| 2885 // Garbage collect pinch nodes that were not consumed. | |
| 2886 // They are usually created by a fat kill MachProj for a call. | |
| 2887 garbage_collect_pinch_nodes(); | |
| 2888 } | |
| 2889 } | |
| 2890 | |
| 2891 // Garbage collect pinch nodes for reuse by other blocks. | |
| 2892 // | |
| 2893 // The block scheduler's insertion of anti-dependence | |
| 2894 // edges creates many pinch nodes when the block contains | |
| 2895 // 2 or more Calls. A pinch node is used to prevent a | |
| 2896 // combinatorial explosion of edges. If a set of kills for a | |
| 2897 // register is anti-dependent on a set of uses (or defs), rather | |
| 2898 // than adding an edge in the graph between each pair of kill | |
| 2899 // and use (or def), a pinch is inserted between them: | |
| 2900 // | |
| 2901 // use1 use2 use3 | |
| 2902 // \ | / | |
| 2903 // \ | / | |
| 2904 // pinch | |
| 2905 // / | \ | |
| 2906 // / | \ | |
| 2907 // kill1 kill2 kill3 | |
| 2908 // | |
| 2909 // One pinch node is created per register killed when | |
| 2910 // the second call is encountered during a backwards pass | |
| 2911 // over the block. Most of these pinch nodes are never | |
| 2912 // wired into the graph because the register is never | |
| 2913 // used or def'ed in the block. | |
| 2914 // | |
| 2915 void Scheduling::garbage_collect_pinch_nodes() { | |
| 2916 #ifndef PRODUCT | |
| 2917 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:"); | |
| 2918 #endif | |
| 2919 int trace_cnt = 0; | |
| 2920 for (uint k = 0; k < _reg_node.Size(); k++) { | |
| 2921 Node* pinch = _reg_node[k]; | |
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2922 if ((pinch != NULL) && pinch->Opcode() == Op_Node && |
| 0 | 2923 // no predecence input edges |
| 2924 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) { | |
| 2925 cleanup_pinch(pinch); | |
| 2926 _pinch_free_list.push(pinch); | |
| 2927 _reg_node.map(k, NULL); | |
| 2928 #ifndef PRODUCT | |
| 2929 if (_cfg->C->trace_opto_output()) { | |
| 2930 trace_cnt++; | |
| 2931 if (trace_cnt > 40) { | |
| 2932 tty->print("\n"); | |
| 2933 trace_cnt = 0; | |
| 2934 } | |
| 2935 tty->print(" %d", pinch->_idx); | |
| 2936 } | |
| 2937 #endif | |
| 2938 } | |
| 2939 } | |
| 2940 #ifndef PRODUCT | |
| 2941 if (_cfg->C->trace_opto_output()) tty->print("\n"); | |
| 2942 #endif | |
| 2943 } | |
| 2944 | |
| 2945 // Clean up a pinch node for reuse. | |
| 2946 void Scheduling::cleanup_pinch( Node *pinch ) { | |
| 2947 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking"); | |
| 2948 | |
| 2949 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) { | |
| 2950 Node* use = pinch->last_out(i); | |
| 2951 uint uses_found = 0; | |
| 2952 for (uint j = use->req(); j < use->len(); j++) { | |
| 2953 if (use->in(j) == pinch) { | |
| 2954 use->rm_prec(j); | |
| 2955 uses_found++; | |
| 2956 } | |
| 2957 } | |
| 2958 assert(uses_found > 0, "must be a precedence edge"); | |
| 2959 i -= uses_found; // we deleted 1 or more copies of this edge | |
| 2960 } | |
| 2961 // May have a later_def entry | |
| 2962 pinch->set_req(0, NULL); | |
| 2963 } | |
| 2964 | |
| 2965 #ifndef PRODUCT | |
| 2966 | |
| 2967 void Scheduling::dump_available() const { | |
| 2968 tty->print("#Availist "); | |
| 2969 for (uint i = 0; i < _available.size(); i++) | |
| 2970 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]); | |
| 2971 tty->cr(); | |
| 2972 } | |
| 2973 | |
| 2974 // Print Scheduling Statistics | |
| 2975 void Scheduling::print_statistics() { | |
| 2976 // Print the size added by nops for bundling | |
| 2977 tty->print("Nops added %d bytes to total of %d bytes", | |
| 2978 _total_nop_size, _total_method_size); | |
| 2979 if (_total_method_size > 0) | |
| 2980 tty->print(", for %.2f%%", | |
| 2981 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0); | |
| 2982 tty->print("\n"); | |
| 2983 | |
| 2984 // Print the number of branch shadows filled | |
| 2985 if (Pipeline::_branch_has_delay_slot) { | |
| 2986 tty->print("Of %d branches, %d had unconditional delay slots filled", | |
| 2987 _total_branches, _total_unconditional_delays); | |
| 2988 if (_total_branches > 0) | |
| 2989 tty->print(", for %.2f%%", | |
| 2990 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0); | |
| 2991 tty->print("\n"); | |
| 2992 } | |
| 2993 | |
| 2994 uint total_instructions = 0, total_bundles = 0; | |
| 2995 | |
| 2996 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) { | |
| 2997 uint bundle_count = _total_instructions_per_bundle[i]; | |
| 2998 total_instructions += bundle_count * i; | |
| 2999 total_bundles += bundle_count; | |
| 3000 } | |
| 3001 | |
| 3002 if (total_bundles > 0) | |
| 3003 tty->print("Average ILP (excluding nops) is %.2f\n", | |
| 3004 ((double)total_instructions) / ((double)total_bundles)); | |
| 3005 } | |
| 3006 #endif |