Mercurial > hg > truffle
annotate src/share/vm/opto/output.cpp @ 17557:c96a3381e55e
8035283: Second phase of branch shortening doesn't account for loop alignment
Summary: added missing check for loop padding case.
Reviewed-by: kvn, jrose
| author | poonam |
|---|---|
| date | Fri, 28 Feb 2014 02:43:16 -0800 |
| parents | 55fb97c4c58d |
| children | 562643f42b65 bbfbe9b06038 |
| 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 extern uint size_exception_handler(); | |
| 46 extern uint size_deopt_handler(); | |
| 47 | |
| 48 #ifndef PRODUCT | |
| 49 #define DEBUG_ARG(x) , x | |
| 50 #else | |
| 51 #define DEBUG_ARG(x) | |
| 52 #endif | |
| 53 | |
| 54 extern int emit_exception_handler(CodeBuffer &cbuf); | |
| 55 extern int emit_deopt_handler(CodeBuffer &cbuf); | |
| 56 | |
| 57 // Convert Nodes to instruction bits and pass off to the VM | |
| 58 void Compile::Output() { | |
| 59 // RootNode goes | |
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60 assert( _cfg->get_root_block()->number_of_nodes() == 0, "" ); |
| 0 | 61 |
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62 // The number of new nodes (mostly MachNop) is proportional to |
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63 // the number of java calls and inner loops which are aligned. |
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64 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 + |
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65 C->inner_loops()*(OptoLoopAlignment-1)), |
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66 "out of nodes before code generation" ) ) { |
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67 return; |
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68 } |
| 0 | 69 // Make sure I can find the Start Node |
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70 Block *entry = _cfg->get_block(1); |
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71 Block *broot = _cfg->get_root_block(); |
| 0 | 72 |
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73 const StartNode *start = entry->head()->as_Start(); |
| 0 | 74 |
| 75 // Replace StartNode with prolog | |
| 76 MachPrologNode *prolog = new (this) MachPrologNode(); | |
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77 entry->map_node(prolog, 0); |
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78 _cfg->map_node_to_block(prolog, entry); |
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79 _cfg->unmap_node_from_block(start); // start is no longer in any block |
| 0 | 80 |
| 81 // Virtual methods need an unverified entry point | |
| 82 | |
| 83 if( is_osr_compilation() ) { | |
| 84 if( PoisonOSREntry ) { | |
| 85 // TODO: Should use a ShouldNotReachHereNode... | |
| 86 _cfg->insert( broot, 0, new (this) MachBreakpointNode() ); | |
| 87 } | |
| 88 } else { | |
| 89 if( _method && !_method->flags().is_static() ) { | |
| 90 // Insert unvalidated entry point | |
| 91 _cfg->insert( broot, 0, new (this) MachUEPNode() ); | |
| 92 } | |
| 93 | |
| 94 } | |
| 95 | |
| 96 | |
| 97 // Break before main entry point | |
| 98 if( (_method && _method->break_at_execute()) | |
| 99 #ifndef PRODUCT | |
| 100 ||(OptoBreakpoint && is_method_compilation()) | |
| 101 ||(OptoBreakpointOSR && is_osr_compilation()) | |
| 102 ||(OptoBreakpointC2R && !_method) | |
| 103 #endif | |
| 104 ) { | |
| 105 // checking for _method means that OptoBreakpoint does not apply to | |
| 106 // runtime stubs or frame converters | |
| 107 _cfg->insert( entry, 1, new (this) MachBreakpointNode() ); | |
| 108 } | |
| 109 | |
| 110 // Insert epilogs before every return | |
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111 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
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112 Block* block = _cfg->get_block(i); |
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113 if (!block->is_connector() && block->non_connector_successor(0) == _cfg->get_root_block()) { // Found a program exit point? |
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114 Node* m = block->end(); |
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115 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt) { |
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116 MachEpilogNode* epilog = new (this) MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return); |
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117 block->add_inst(epilog); |
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118 _cfg->map_node_to_block(epilog, block); |
| 0 | 119 } |
| 120 } | |
| 121 } | |
| 122 | |
| 123 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
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124 if (ZapDeadCompiledLocals) { |
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125 Insert_zap_nodes(); |
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126 } |
| 0 | 127 # endif |
| 128 | |
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129 uint* blk_starts = NEW_RESOURCE_ARRAY(uint, _cfg->number_of_blocks() + 1); |
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130 blk_starts[0] = 0; |
| 3851 | 131 |
| 132 // Initialize code buffer and process short branches. | |
| 133 CodeBuffer* cb = init_buffer(blk_starts); | |
| 134 | |
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135 if (cb == NULL || failing()) { |
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136 return; |
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137 } |
| 3851 | 138 |
| 0 | 139 ScheduleAndBundle(); |
| 140 | |
| 141 #ifndef PRODUCT | |
| 142 if (trace_opto_output()) { | |
| 143 tty->print("\n---- After ScheduleAndBundle ----\n"); | |
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144 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
| 0 | 145 tty->print("\nBB#%03d:\n", i); |
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146 Block* block = _cfg->get_block(i); |
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147 for (uint j = 0; j < block->number_of_nodes(); j++) { |
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148 Node* n = block->get_node(j); |
| 0 | 149 OptoReg::Name reg = _regalloc->get_reg_first(n); |
| 150 tty->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : ""); | |
| 151 n->dump(); | |
| 152 } | |
| 153 } | |
| 154 } | |
| 155 #endif | |
| 156 | |
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157 if (failing()) { |
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158 return; |
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159 } |
| 0 | 160 |
| 161 BuildOopMaps(); | |
| 162 | |
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163 if (failing()) { |
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164 return; |
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165 } |
| 0 | 166 |
| 3851 | 167 fill_buffer(cb, blk_starts); |
| 0 | 168 } |
| 169 | |
| 170 bool Compile::need_stack_bang(int frame_size_in_bytes) const { | |
| 171 // Determine if we need to generate a stack overflow check. | |
| 172 // Do it if the method is not a stub function and | |
| 173 // has java calls or has frame size > vm_page_size/8. | |
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174 return (UseStackBanging && stub_function() == NULL && |
| 0 | 175 (has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3)); |
| 176 } | |
| 177 | |
| 178 bool Compile::need_register_stack_bang() const { | |
| 179 // Determine if we need to generate a register stack overflow check. | |
| 180 // This is only used on architectures which have split register | |
| 181 // and memory stacks (ie. IA64). | |
| 182 // Bang if the method is not a stub function and has java calls | |
| 183 return (stub_function() == NULL && has_java_calls()); | |
| 184 } | |
| 185 | |
| 186 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 187 | |
| 188 | |
| 189 // In order to catch compiler oop-map bugs, we have implemented | |
| 190 // a debugging mode called ZapDeadCompilerLocals. | |
| 191 // This mode causes the compiler to insert a call to a runtime routine, | |
| 192 // "zap_dead_locals", right before each place in compiled code | |
| 193 // that could potentially be a gc-point (i.e., a safepoint or oop map point). | |
| 194 // The runtime routine checks that locations mapped as oops are really | |
| 195 // oops, that locations mapped as values do not look like oops, | |
| 196 // and that locations mapped as dead are not used later | |
| 197 // (by zapping them to an invalid address). | |
| 198 | |
| 199 int Compile::_CompiledZap_count = 0; | |
| 200 | |
| 201 void Compile::Insert_zap_nodes() { | |
| 202 bool skip = false; | |
| 203 | |
| 204 | |
| 205 // Dink with static counts because code code without the extra | |
| 206 // runtime calls is MUCH faster for debugging purposes | |
| 207 | |
| 208 if ( CompileZapFirst == 0 ) ; // nothing special | |
| 209 else if ( CompileZapFirst > CompiledZap_count() ) skip = true; | |
| 210 else if ( CompileZapFirst == CompiledZap_count() ) | |
| 211 warning("starting zap compilation after skipping"); | |
| 212 | |
| 213 if ( CompileZapLast == -1 ) ; // nothing special | |
| 214 else if ( CompileZapLast < CompiledZap_count() ) skip = true; | |
| 215 else if ( CompileZapLast == CompiledZap_count() ) | |
| 216 warning("about to compile last zap"); | |
| 217 | |
| 218 ++_CompiledZap_count; // counts skipped zaps, too | |
| 219 | |
| 220 if ( skip ) return; | |
| 221 | |
| 222 | |
| 223 if ( _method == NULL ) | |
| 224 return; // no safepoints/oopmaps emitted for calls in stubs,so we don't care | |
| 225 | |
| 226 // Insert call to zap runtime stub before every node with an oop map | |
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227 for( uint i=0; i<_cfg->number_of_blocks(); i++ ) { |
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228 Block *b = _cfg->get_block(i); |
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229 for ( uint j = 0; j < b->number_of_nodes(); ++j ) { |
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230 Node *n = b->get_node(j); |
| 0 | 231 |
| 232 // Determining if we should insert a zap-a-lot node in output. | |
| 233 // We do that for all nodes that has oopmap info, except for calls | |
| 234 // to allocation. Calls to allocation passes in the old top-of-eden pointer | |
| 235 // and expect the C code to reset it. Hence, there can be no safepoints between | |
| 236 // the inlined-allocation and the call to new_Java, etc. | |
| 237 // We also cannot zap monitor calls, as they must hold the microlock | |
| 238 // during the call to Zap, which also wants to grab the microlock. | |
| 239 bool insert = n->is_MachSafePoint() && (n->as_MachSafePoint()->oop_map() != NULL); | |
| 240 if ( insert ) { // it is MachSafePoint | |
| 241 if ( !n->is_MachCall() ) { | |
| 242 insert = false; | |
| 243 } else if ( n->is_MachCall() ) { | |
| 244 MachCallNode* call = n->as_MachCall(); | |
| 245 if (call->entry_point() == OptoRuntime::new_instance_Java() || | |
| 246 call->entry_point() == OptoRuntime::new_array_Java() || | |
| 247 call->entry_point() == OptoRuntime::multianewarray2_Java() || | |
| 248 call->entry_point() == OptoRuntime::multianewarray3_Java() || | |
| 249 call->entry_point() == OptoRuntime::multianewarray4_Java() || | |
| 250 call->entry_point() == OptoRuntime::multianewarray5_Java() || | |
| 251 call->entry_point() == OptoRuntime::slow_arraycopy_Java() || | |
| 252 call->entry_point() == OptoRuntime::complete_monitor_locking_Java() | |
| 253 ) { | |
| 254 insert = false; | |
| 255 } | |
| 256 } | |
| 257 if (insert) { | |
| 258 Node *zap = call_zap_node(n->as_MachSafePoint(), i); | |
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259 b->insert_node(zap, j); |
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260 _cfg->map_node_to_block(zap, b); |
| 0 | 261 ++j; |
| 262 } | |
| 263 } | |
| 264 } | |
| 265 } | |
| 266 } | |
| 267 | |
| 268 | |
| 269 Node* Compile::call_zap_node(MachSafePointNode* node_to_check, int block_no) { | |
| 270 const TypeFunc *tf = OptoRuntime::zap_dead_locals_Type(); | |
| 271 CallStaticJavaNode* ideal_node = | |
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272 new (this) CallStaticJavaNode( tf, |
| 0 | 273 OptoRuntime::zap_dead_locals_stub(_method->flags().is_native()), |
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274 "call zap dead locals stub", 0, TypePtr::BOTTOM); |
| 0 | 275 // We need to copy the OopMap from the site we're zapping at. |
| 276 // We have to make a copy, because the zap site might not be | |
| 277 // a call site, and zap_dead is a call site. | |
| 278 OopMap* clone = node_to_check->oop_map()->deep_copy(); | |
| 279 | |
| 280 // Add the cloned OopMap to the zap node | |
| 281 ideal_node->set_oop_map(clone); | |
| 282 return _matcher->match_sfpt(ideal_node); | |
| 283 } | |
| 284 | |
| 285 bool Compile::is_node_getting_a_safepoint( Node* n) { | |
| 286 // This code duplicates the logic prior to the call of add_safepoint | |
| 287 // below in this file. | |
| 288 if( n->is_MachSafePoint() ) return true; | |
| 289 return false; | |
| 290 } | |
| 291 | |
| 292 # endif // ENABLE_ZAP_DEAD_LOCALS | |
| 293 | |
| 418 | 294 // Compute the size of first NumberOfLoopInstrToAlign instructions at the top |
| 0 | 295 // of a loop. When aligning a loop we need to provide enough instructions |
| 296 // in cpu's fetch buffer to feed decoders. The loop alignment could be | |
| 297 // avoided if we have enough instructions in fetch buffer at the head of a loop. | |
| 298 // By default, the size is set to 999999 by Block's constructor so that | |
| 299 // a loop will be aligned if the size is not reset here. | |
| 300 // | |
| 301 // Note: Mach instructions could contain several HW instructions | |
| 302 // so the size is estimated only. | |
| 303 // | |
| 304 void Compile::compute_loop_first_inst_sizes() { | |
| 305 // The next condition is used to gate the loop alignment optimization. | |
| 306 // Don't aligned a loop if there are enough instructions at the head of a loop | |
| 307 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad | |
| 308 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is | |
| 309 // equal to 11 bytes which is the largest address NOP instruction. | |
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310 if (MaxLoopPad < OptoLoopAlignment - 1) { |
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311 uint last_block = _cfg->number_of_blocks() - 1; |
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312 for (uint i = 1; i <= last_block; i++) { |
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313 Block* block = _cfg->get_block(i); |
| 0 | 314 // Check the first loop's block which requires an alignment. |
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315 if (block->loop_alignment() > (uint)relocInfo::addr_unit()) { |
| 0 | 316 uint sum_size = 0; |
| 317 uint inst_cnt = NumberOfLoopInstrToAlign; | |
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318 inst_cnt = block->compute_first_inst_size(sum_size, inst_cnt, _regalloc); |
| 418 | 319 |
| 320 // Check subsequent fallthrough blocks if the loop's first | |
| 321 // block(s) does not have enough instructions. | |
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322 Block *nb = block; |
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323 while(inst_cnt > 0 && |
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324 i < last_block && |
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325 !_cfg->get_block(i + 1)->has_loop_alignment() && |
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326 !nb->has_successor(block)) { |
| 418 | 327 i++; |
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328 nb = _cfg->get_block(i); |
| 418 | 329 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, _regalloc); |
| 330 } // while( inst_cnt > 0 && i < last_block ) | |
| 331 | |
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332 block->set_first_inst_size(sum_size); |
| 0 | 333 } // f( b->head()->is_Loop() ) |
| 334 } // for( i <= last_block ) | |
| 335 } // if( MaxLoopPad < OptoLoopAlignment-1 ) | |
| 336 } | |
| 337 | |
| 338 // The architecture description provides short branch variants for some long | |
| 339 // branch instructions. Replace eligible long branches with short branches. | |
| 3851 | 340 void Compile::shorten_branches(uint* blk_starts, int& code_size, int& reloc_size, int& stub_size) { |
| 0 | 341 // Compute size of each block, method size, and relocation information size |
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342 uint nblocks = _cfg->number_of_blocks(); |
| 3851 | 343 |
| 344 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks); | |
| 345 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks); | |
| 346 int* jmp_nidx = NEW_RESOURCE_ARRAY(int ,nblocks); | |
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347 |
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348 // Collect worst case block paddings |
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349 int* block_worst_case_pad = NEW_RESOURCE_ARRAY(int, nblocks); |
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350 memset(block_worst_case_pad, 0, nblocks * sizeof(int)); |
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351 |
| 3851 | 352 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); ) |
| 353 DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); ) | |
| 354 | |
| 355 bool has_short_branch_candidate = false; | |
| 0 | 356 |
| 357 // Initialize the sizes to 0 | |
| 358 code_size = 0; // Size in bytes of generated code | |
| 359 stub_size = 0; // Size in bytes of all stub entries | |
| 360 // Size in bytes of all relocation entries, including those in local stubs. | |
| 361 // Start with 2-bytes of reloc info for the unvalidated entry point | |
| 362 reloc_size = 1; // Number of relocation entries | |
| 363 | |
| 364 // Make three passes. The first computes pessimistic blk_starts, | |
| 3851 | 365 // relative jmp_offset and reloc_size information. The second performs |
| 2008 | 366 // short branch substitution using the pessimistic sizing. The |
| 367 // third inserts nops where needed. | |
| 0 | 368 |
| 369 // Step one, perform a pessimistic sizing pass. | |
| 3851 | 370 uint last_call_adr = max_uint; |
| 371 uint last_avoid_back_to_back_adr = max_uint; | |
| 0 | 372 uint nop_size = (new (this) MachNopNode())->size(_regalloc); |
| 3851 | 373 for (uint i = 0; i < nblocks; i++) { // For all blocks |
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374 Block* block = _cfg->get_block(i); |
| 0 | 375 |
| 3851 | 376 // During short branch replacement, we store the relative (to blk_starts) |
| 377 // offset of jump in jmp_offset, rather than the absolute offset of jump. | |
| 378 // This is so that we do not need to recompute sizes of all nodes when | |
| 379 // we compute correct blk_starts in our next sizing pass. | |
| 380 jmp_offset[i] = 0; | |
| 381 jmp_size[i] = 0; | |
| 382 jmp_nidx[i] = -1; | |
| 383 DEBUG_ONLY( jmp_target[i] = 0; ) | |
| 384 DEBUG_ONLY( jmp_rule[i] = 0; ) | |
| 385 | |
| 0 | 386 // Sum all instruction sizes to compute block size |
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387 uint last_inst = block->number_of_nodes(); |
| 0 | 388 uint blk_size = 0; |
| 3851 | 389 for (uint j = 0; j < last_inst; j++) { |
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390 Node* nj = block->get_node(j); |
| 0 | 391 // Handle machine instruction nodes |
| 3851 | 392 if (nj->is_Mach()) { |
| 0 | 393 MachNode *mach = nj->as_Mach(); |
| 394 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding | |
| 395 reloc_size += mach->reloc(); | |
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396 if (mach->is_MachCall()) { |
| 0 | 397 MachCallNode *mcall = mach->as_MachCall(); |
| 398 // This destination address is NOT PC-relative | |
| 399 | |
| 400 mcall->method_set((intptr_t)mcall->entry_point()); | |
| 401 | |
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402 if (mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method) { |
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403 stub_size += CompiledStaticCall::to_interp_stub_size(); |
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404 reloc_size += CompiledStaticCall::reloc_to_interp_stub(); |
| 0 | 405 } |
| 406 } else if (mach->is_MachSafePoint()) { | |
| 407 // If call/safepoint are adjacent, account for possible | |
| 408 // nop to disambiguate the two safepoints. | |
| 3851 | 409 // ScheduleAndBundle() can rearrange nodes in a block, |
| 410 // check for all offsets inside this block. | |
| 411 if (last_call_adr >= blk_starts[i]) { | |
| 412 blk_size += nop_size; | |
| 413 } | |
| 414 } | |
| 415 if (mach->avoid_back_to_back()) { | |
| 416 // Nop is inserted between "avoid back to back" instructions. | |
| 417 // ScheduleAndBundle() can rearrange nodes in a block, | |
| 418 // check for all offsets inside this block. | |
| 419 if (last_avoid_back_to_back_adr >= blk_starts[i]) { | |
| 0 | 420 blk_size += nop_size; |
| 421 } | |
| 422 } | |
| 3851 | 423 if (mach->may_be_short_branch()) { |
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424 if (!nj->is_MachBranch()) { |
| 3851 | 425 #ifndef PRODUCT |
| 426 nj->dump(3); | |
| 427 #endif | |
| 428 Unimplemented(); | |
| 429 } | |
| 430 assert(jmp_nidx[i] == -1, "block should have only one branch"); | |
| 431 jmp_offset[i] = blk_size; | |
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432 jmp_size[i] = nj->size(_regalloc); |
| 3851 | 433 jmp_nidx[i] = j; |
| 434 has_short_branch_candidate = true; | |
| 435 } | |
| 0 | 436 } |
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437 blk_size += nj->size(_regalloc); |
| 0 | 438 // Remember end of call offset |
| 3842 | 439 if (nj->is_MachCall() && !nj->is_MachCallLeaf()) { |
| 3851 | 440 last_call_adr = blk_starts[i]+blk_size; |
| 441 } | |
| 442 // Remember end of avoid_back_to_back offset | |
| 443 if (nj->is_Mach() && nj->as_Mach()->avoid_back_to_back()) { | |
| 444 last_avoid_back_to_back_adr = blk_starts[i]+blk_size; | |
| 0 | 445 } |
| 446 } | |
| 447 | |
| 448 // When the next block starts a loop, we may insert pad NOP | |
| 449 // instructions. Since we cannot know our future alignment, | |
| 450 // assume the worst. | |
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451 if (i < nblocks - 1) { |
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452 Block* nb = _cfg->get_block(i + 1); |
| 0 | 453 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit(); |
| 3851 | 454 if (max_loop_pad > 0) { |
| 0 | 455 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), ""); |
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456 // Adjust last_call_adr and/or last_avoid_back_to_back_adr. |
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457 // If either is the last instruction in this block, bump by |
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458 // max_loop_pad in lock-step with blk_size, so sizing |
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459 // calculations in subsequent blocks still can conservatively |
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460 // detect that it may the last instruction in this block. |
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461 if (last_call_adr == blk_starts[i]+blk_size) { |
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462 last_call_adr += max_loop_pad; |
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463 } |
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464 if (last_avoid_back_to_back_adr == blk_starts[i]+blk_size) { |
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465 last_avoid_back_to_back_adr += max_loop_pad; |
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466 } |
| 0 | 467 blk_size += max_loop_pad; |
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468 block_worst_case_pad[i + 1] = max_loop_pad; |
| 0 | 469 } |
| 470 } | |
| 471 | |
| 472 // Save block size; update total method size | |
| 473 blk_starts[i+1] = blk_starts[i]+blk_size; | |
| 474 } | |
| 475 | |
| 476 // Step two, replace eligible long jumps. | |
| 3851 | 477 bool progress = true; |
| 478 uint last_may_be_short_branch_adr = max_uint; | |
| 479 while (has_short_branch_candidate && progress) { | |
| 480 progress = false; | |
| 481 has_short_branch_candidate = false; | |
| 482 int adjust_block_start = 0; | |
| 483 for (uint i = 0; i < nblocks; i++) { | |
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484 Block* block = _cfg->get_block(i); |
| 3851 | 485 int idx = jmp_nidx[i]; |
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486 MachNode* mach = (idx == -1) ? NULL: block->get_node(idx)->as_Mach(); |
| 3851 | 487 if (mach != NULL && mach->may_be_short_branch()) { |
| 488 #ifdef ASSERT | |
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489 assert(jmp_size[i] > 0 && mach->is_MachBranch(), "sanity"); |
| 3851 | 490 int j; |
| 491 // Find the branch; ignore trailing NOPs. | |
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492 for (j = block->number_of_nodes()-1; j>=0; j--) { |
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493 Node* n = block->get_node(j); |
| 3851 | 494 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) |
| 495 break; | |
| 496 } | |
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497 assert(j >= 0 && j == idx && block->get_node(j) == (Node*)mach, "sanity"); |
| 3851 | 498 #endif |
| 499 int br_size = jmp_size[i]; | |
| 500 int br_offs = blk_starts[i] + jmp_offset[i]; | |
| 501 | |
| 0 | 502 // This requires the TRUE branch target be in succs[0] |
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503 uint bnum = block->non_connector_successor(0)->_pre_order; |
| 3851 | 504 int offset = blk_starts[bnum] - br_offs; |
| 505 if (bnum > i) { // adjust following block's offset | |
| 506 offset -= adjust_block_start; | |
| 507 } | |
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508 |
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509 // This block can be a loop header, account for the padding |
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510 // in the previous block. |
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511 int block_padding = block_worst_case_pad[i]; |
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512 assert(i == 0 || block_padding == 0 || br_offs >= block_padding, "Should have at least a padding on top"); |
| 3851 | 513 // In the following code a nop could be inserted before |
| 514 // the branch which will increase the backward distance. | |
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515 bool needs_padding = ((uint)(br_offs - block_padding) == last_may_be_short_branch_adr); |
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516 assert(!needs_padding || jmp_offset[i] == 0, "padding only branches at the beginning of block"); |
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517 |
| 3851 | 518 if (needs_padding && offset <= 0) |
| 519 offset -= nop_size; | |
| 520 | |
| 521 if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) { | |
| 522 // We've got a winner. Replace this branch. | |
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523 MachNode* replacement = mach->as_MachBranch()->short_branch_version(this); |
| 3851 | 524 |
| 525 // Update the jmp_size. | |
| 526 int new_size = replacement->size(_regalloc); | |
| 527 int diff = br_size - new_size; | |
| 528 assert(diff >= (int)nop_size, "short_branch size should be smaller"); | |
| 529 // Conservatively take into accound padding between | |
| 530 // avoid_back_to_back branches. Previous branch could be | |
| 531 // converted into avoid_back_to_back branch during next | |
| 532 // rounds. | |
| 533 if (needs_padding && replacement->avoid_back_to_back()) { | |
| 534 jmp_offset[i] += nop_size; | |
| 535 diff -= nop_size; | |
| 0 | 536 } |
| 3851 | 537 adjust_block_start += diff; |
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538 block->map_node(replacement, idx); |
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539 mach->subsume_by(replacement, C); |
| 3851 | 540 mach = replacement; |
| 541 progress = true; | |
| 542 | |
| 543 jmp_size[i] = new_size; | |
| 544 DEBUG_ONLY( jmp_target[i] = bnum; ); | |
| 545 DEBUG_ONLY( jmp_rule[i] = mach->rule(); ); | |
| 0 | 546 } else { |
| 3851 | 547 // The jump distance is not short, try again during next iteration. |
| 548 has_short_branch_candidate = true; | |
| 0 | 549 } |
| 3851 | 550 } // (mach->may_be_short_branch()) |
| 551 if (mach != NULL && (mach->may_be_short_branch() || | |
| 552 mach->avoid_back_to_back())) { | |
| 553 last_may_be_short_branch_adr = blk_starts[i] + jmp_offset[i] + jmp_size[i]; | |
| 0 | 554 } |
| 3851 | 555 blk_starts[i+1] -= adjust_block_start; |
| 0 | 556 } |
| 557 } | |
| 558 | |
| 559 #ifdef ASSERT | |
| 3851 | 560 for (uint i = 0; i < nblocks; i++) { // For all blocks |
| 561 if (jmp_target[i] != 0) { | |
| 562 int br_size = jmp_size[i]; | |
| 563 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]); | |
| 564 if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) { | |
| 565 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 | 566 } |
| 3851 | 567 assert(_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset), "Displacement too large for short jmp"); |
| 0 | 568 } |
| 569 } | |
| 570 #endif | |
| 571 | |
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572 // Step 3, compute the offsets of all blocks, will be done in fill_buffer() |
| 3851 | 573 // after ScheduleAndBundle(). |
| 574 | |
| 0 | 575 // ------------------ |
| 576 // Compute size for code buffer | |
| 3851 | 577 code_size = blk_starts[nblocks]; |
| 0 | 578 |
| 579 // Relocation records | |
| 580 reloc_size += 1; // Relo entry for exception handler | |
| 581 | |
| 582 // Adjust reloc_size to number of record of relocation info | |
| 583 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for | |
| 584 // a relocation index. | |
| 585 // The CodeBuffer will expand the locs array if this estimate is too low. | |
| 3851 | 586 reloc_size *= 10 / sizeof(relocInfo); |
| 587 } | |
| 588 | |
| 0 | 589 //------------------------------FillLocArray----------------------------------- |
| 590 // Create a bit of debug info and append it to the array. The mapping is from | |
| 591 // Java local or expression stack to constant, register or stack-slot. For | |
| 592 // doubles, insert 2 mappings and return 1 (to tell the caller that the next | |
| 593 // entry has been taken care of and caller should skip it). | |
| 594 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) { | |
| 595 // This should never have accepted Bad before | |
| 596 assert(OptoReg::is_valid(regnum), "location must be valid"); | |
| 597 return (OptoReg::is_reg(regnum)) | |
| 598 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) ) | |
| 599 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum))); | |
| 600 } | |
| 601 | |
|
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602 |
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603 ObjectValue* |
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604 Compile::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) { |
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605 for (int i = 0; i < objs->length(); i++) { |
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606 assert(objs->at(i)->is_object(), "corrupt object cache"); |
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607 ObjectValue* sv = (ObjectValue*) objs->at(i); |
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608 if (sv->id() == id) { |
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609 return sv; |
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610 } |
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611 } |
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612 // Otherwise.. |
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613 return NULL; |
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614 } |
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615 |
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616 void Compile::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs, |
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617 ObjectValue* sv ) { |
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618 assert(sv_for_node_id(objs, sv->id()) == NULL, "Precondition"); |
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619 objs->append(sv); |
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620 } |
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621 |
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622 |
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623 void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local, |
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624 GrowableArray<ScopeValue*> *array, |
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625 GrowableArray<ScopeValue*> *objs ) { |
| 0 | 626 assert( local, "use _top instead of null" ); |
| 627 if (array->length() != idx) { | |
| 628 assert(array->length() == idx + 1, "Unexpected array count"); | |
| 629 // Old functionality: | |
| 630 // return | |
| 631 // New functionality: | |
| 632 // Assert if the local is not top. In product mode let the new node | |
| 633 // override the old entry. | |
| 634 assert(local == top(), "LocArray collision"); | |
| 635 if (local == top()) { | |
| 636 return; | |
| 637 } | |
| 638 array->pop(); | |
| 639 } | |
| 640 const Type *t = local->bottom_type(); | |
| 641 | |
|
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642 // Is it a safepoint scalar object node? |
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643 if (local->is_SafePointScalarObject()) { |
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644 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject(); |
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645 |
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646 ObjectValue* sv = Compile::sv_for_node_id(objs, spobj->_idx); |
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647 if (sv == NULL) { |
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648 ciKlass* cik = t->is_oopptr()->klass(); |
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649 assert(cik->is_instance_klass() || |
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650 cik->is_array_klass(), "Not supported allocation."); |
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651 sv = new ObjectValue(spobj->_idx, |
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652 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding())); |
|
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653 Compile::set_sv_for_object_node(objs, sv); |
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654 |
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655 uint first_ind = spobj->first_index(sfpt->jvms()); |
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656 for (uint i = 0; i < spobj->n_fields(); i++) { |
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657 Node* fld_node = sfpt->in(first_ind+i); |
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658 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs); |
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659 } |
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660 } |
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661 array->append(sv); |
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662 return; |
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663 } |
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664 |
| 0 | 665 // Grab the register number for the local |
| 666 OptoReg::Name regnum = _regalloc->get_reg_first(local); | |
| 667 if( OptoReg::is_valid(regnum) ) {// Got a register/stack? | |
| 668 // Record the double as two float registers. | |
| 669 // The register mask for such a value always specifies two adjacent | |
| 670 // float registers, with the lower register number even. | |
| 671 // Normally, the allocation of high and low words to these registers | |
| 672 // is irrelevant, because nearly all operations on register pairs | |
| 673 // (e.g., StoreD) treat them as a single unit. | |
| 674 // Here, we assume in addition that the words in these two registers | |
| 675 // stored "naturally" (by operations like StoreD and double stores | |
| 676 // within the interpreter) such that the lower-numbered register | |
| 677 // is written to the lower memory address. This may seem like | |
| 678 // a machine dependency, but it is not--it is a requirement on | |
| 679 // the author of the <arch>.ad file to ensure that, for every | |
| 680 // even/odd double-register pair to which a double may be allocated, | |
| 681 // the word in the even single-register is stored to the first | |
| 682 // memory word. (Note that register numbers are completely | |
| 683 // arbitrary, and are not tied to any machine-level encodings.) | |
| 684 #ifdef _LP64 | |
| 685 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) { | |
| 686 array->append(new ConstantIntValue(0)); | |
| 687 array->append(new_loc_value( _regalloc, regnum, Location::dbl )); | |
| 688 } else if ( t->base() == Type::Long ) { | |
| 689 array->append(new ConstantIntValue(0)); | |
| 690 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
| 691 } else if ( t->base() == Type::RawPtr ) { | |
| 692 // jsr/ret return address which must be restored into a the full | |
| 693 // width 64-bit stack slot. | |
| 694 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
| 695 } | |
| 696 #else //_LP64 | |
| 697 #ifdef SPARC | |
| 698 if (t->base() == Type::Long && OptoReg::is_reg(regnum)) { | |
| 699 // For SPARC we have to swap high and low words for | |
| 700 // long values stored in a single-register (g0-g7). | |
| 701 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
| 702 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
| 703 } else | |
| 704 #endif //SPARC | |
| 705 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) { | |
| 706 // Repack the double/long as two jints. | |
| 707 // The convention the interpreter uses is that the second local | |
| 708 // holds the first raw word of the native double representation. | |
| 709 // This is actually reasonable, since locals and stack arrays | |
| 710 // grow downwards in all implementations. | |
| 711 // (If, on some machine, the interpreter's Java locals or stack | |
| 712 // were to grow upwards, the embedded doubles would be word-swapped.) | |
| 713 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
| 714 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
| 715 } | |
| 716 #endif //_LP64 | |
| 717 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) && | |
| 718 OptoReg::is_reg(regnum) ) { | |
|
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719 array->append(new_loc_value( _regalloc, regnum, Matcher::float_in_double() |
| 0 | 720 ? Location::float_in_dbl : Location::normal )); |
| 721 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) { | |
| 722 array->append(new_loc_value( _regalloc, regnum, Matcher::int_in_long | |
| 723 ? Location::int_in_long : Location::normal )); | |
|
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724 } else if( t->base() == Type::NarrowOop ) { |
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725 array->append(new_loc_value( _regalloc, regnum, Location::narrowoop )); |
| 0 | 726 } else { |
| 727 array->append(new_loc_value( _regalloc, regnum, _regalloc->is_oop(local) ? Location::oop : Location::normal )); | |
| 728 } | |
| 729 return; | |
| 730 } | |
| 731 | |
| 732 // No register. It must be constant data. | |
| 733 switch (t->base()) { | |
| 734 case Type::Half: // Second half of a double | |
| 735 ShouldNotReachHere(); // Caller should skip 2nd halves | |
| 736 break; | |
| 737 case Type::AnyPtr: | |
| 738 array->append(new ConstantOopWriteValue(NULL)); | |
| 739 break; | |
| 740 case Type::AryPtr: | |
|
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741 case Type::InstPtr: // fall through |
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742 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->constant_encoding())); |
| 0 | 743 break; |
|
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744 case Type::NarrowOop: |
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745 if (t == TypeNarrowOop::NULL_PTR) { |
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746 array->append(new ConstantOopWriteValue(NULL)); |
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747 } else { |
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748 array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->constant_encoding())); |
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749 } |
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750 break; |
| 0 | 751 case Type::Int: |
| 752 array->append(new ConstantIntValue(t->is_int()->get_con())); | |
| 753 break; | |
| 754 case Type::RawPtr: | |
| 755 // A return address (T_ADDRESS). | |
| 756 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI"); | |
| 757 #ifdef _LP64 | |
| 758 // Must be restored to the full-width 64-bit stack slot. | |
| 759 array->append(new ConstantLongValue(t->is_ptr()->get_con())); | |
| 760 #else | |
| 761 array->append(new ConstantIntValue(t->is_ptr()->get_con())); | |
| 762 #endif | |
| 763 break; | |
| 764 case Type::FloatCon: { | |
| 765 float f = t->is_float_constant()->getf(); | |
| 766 array->append(new ConstantIntValue(jint_cast(f))); | |
| 767 break; | |
| 768 } | |
| 769 case Type::DoubleCon: { | |
| 770 jdouble d = t->is_double_constant()->getd(); | |
| 771 #ifdef _LP64 | |
| 772 array->append(new ConstantIntValue(0)); | |
| 773 array->append(new ConstantDoubleValue(d)); | |
| 774 #else | |
| 775 // Repack the double as two jints. | |
| 776 // The convention the interpreter uses is that the second local | |
| 777 // holds the first raw word of the native double representation. | |
| 778 // This is actually reasonable, since locals and stack arrays | |
| 779 // grow downwards in all implementations. | |
| 780 // (If, on some machine, the interpreter's Java locals or stack | |
| 781 // were to grow upwards, the embedded doubles would be word-swapped.) | |
| 782 jint *dp = (jint*)&d; | |
| 783 array->append(new ConstantIntValue(dp[1])); | |
| 784 array->append(new ConstantIntValue(dp[0])); | |
| 785 #endif | |
| 786 break; | |
| 787 } | |
| 788 case Type::Long: { | |
| 789 jlong d = t->is_long()->get_con(); | |
| 790 #ifdef _LP64 | |
| 791 array->append(new ConstantIntValue(0)); | |
| 792 array->append(new ConstantLongValue(d)); | |
| 793 #else | |
| 794 // Repack the long as two jints. | |
| 795 // The convention the interpreter uses is that the second local | |
| 796 // holds the first raw word of the native double representation. | |
| 797 // This is actually reasonable, since locals and stack arrays | |
| 798 // grow downwards in all implementations. | |
| 799 // (If, on some machine, the interpreter's Java locals or stack | |
| 800 // were to grow upwards, the embedded doubles would be word-swapped.) | |
| 801 jint *dp = (jint*)&d; | |
| 802 array->append(new ConstantIntValue(dp[1])); | |
| 803 array->append(new ConstantIntValue(dp[0])); | |
| 804 #endif | |
| 805 break; | |
| 806 } | |
| 807 case Type::Top: // Add an illegal value here | |
| 808 array->append(new LocationValue(Location())); | |
| 809 break; | |
| 810 default: | |
| 811 ShouldNotReachHere(); | |
| 812 break; | |
| 813 } | |
| 814 } | |
| 815 | |
| 816 // Determine if this node starts a bundle | |
| 817 bool Compile::starts_bundle(const Node *n) const { | |
| 818 return (_node_bundling_limit > n->_idx && | |
| 819 _node_bundling_base[n->_idx].starts_bundle()); | |
| 820 } | |
| 821 | |
| 822 //--------------------------Process_OopMap_Node-------------------------------- | |
| 823 void Compile::Process_OopMap_Node(MachNode *mach, int current_offset) { | |
| 824 | |
| 825 // Handle special safepoint nodes for synchronization | |
| 826 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
| 827 MachCallNode *mcall; | |
| 828 | |
| 829 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 830 assert( is_node_getting_a_safepoint(mach), "logic does not match; false negative"); | |
| 831 #endif | |
| 832 | |
| 833 int safepoint_pc_offset = current_offset; | |
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834 bool is_method_handle_invoke = false; |
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835 bool return_oop = false; |
| 0 | 836 |
| 837 // Add the safepoint in the DebugInfoRecorder | |
| 838 if( !mach->is_MachCall() ) { | |
| 839 mcall = NULL; | |
| 840 debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map); | |
| 841 } else { | |
| 842 mcall = mach->as_MachCall(); | |
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843 |
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844 // Is the call a MethodHandle call? |
| 1265 | 845 if (mcall->is_MachCallJava()) { |
| 846 if (mcall->as_MachCallJava()->_method_handle_invoke) { | |
| 847 assert(has_method_handle_invokes(), "must have been set during call generation"); | |
| 848 is_method_handle_invoke = true; | |
| 849 } | |
| 850 } | |
|
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851 |
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852 // Check if a call returns an object. |
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853 if (mcall->return_value_is_used() && |
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854 mcall->tf()->range()->field_at(TypeFunc::Parms)->isa_ptr()) { |
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855 return_oop = true; |
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856 } |
| 0 | 857 safepoint_pc_offset += mcall->ret_addr_offset(); |
| 858 debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map); | |
| 859 } | |
| 860 | |
| 861 // Loop over the JVMState list to add scope information | |
| 862 // Do not skip safepoints with a NULL method, they need monitor info | |
| 863 JVMState* youngest_jvms = sfn->jvms(); | |
| 864 int max_depth = youngest_jvms->depth(); | |
| 865 | |
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866 // Allocate the object pool for scalar-replaced objects -- the map from |
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867 // small-integer keys (which can be recorded in the local and ostack |
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868 // arrays) to descriptions of the object state. |
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869 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>(); |
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870 |
| 0 | 871 // Visit scopes from oldest to youngest. |
| 872 for (int depth = 1; depth <= max_depth; depth++) { | |
| 873 JVMState* jvms = youngest_jvms->of_depth(depth); | |
| 874 int idx; | |
| 875 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
| 876 // Safepoints that do not have method() set only provide oop-map and monitor info | |
| 877 // to support GC; these do not support deoptimization. | |
| 878 int num_locs = (method == NULL) ? 0 : jvms->loc_size(); | |
| 879 int num_exps = (method == NULL) ? 0 : jvms->stk_size(); | |
| 880 int num_mon = jvms->nof_monitors(); | |
| 881 assert(method == NULL || jvms->bci() < 0 || num_locs == method->max_locals(), | |
| 882 "JVMS local count must match that of the method"); | |
| 883 | |
| 884 // Add Local and Expression Stack Information | |
| 885 | |
| 886 // Insert locals into the locarray | |
| 887 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs); | |
| 888 for( idx = 0; idx < num_locs; idx++ ) { | |
|
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889 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs ); |
| 0 | 890 } |
| 891 | |
| 892 // Insert expression stack entries into the exparray | |
| 893 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps); | |
| 894 for( idx = 0; idx < num_exps; idx++ ) { | |
|
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895 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs ); |
| 0 | 896 } |
| 897 | |
| 898 // Add in mappings of the monitors | |
| 899 assert( !method || | |
| 900 !method->is_synchronized() || | |
| 901 method->is_native() || | |
| 902 num_mon > 0 || | |
| 903 !GenerateSynchronizationCode, | |
| 904 "monitors must always exist for synchronized methods"); | |
| 905 | |
| 906 // Build the growable array of ScopeValues for exp stack | |
| 907 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon); | |
| 908 | |
| 909 // Loop over monitors and insert into array | |
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910 for (idx = 0; idx < num_mon; idx++) { |
| 0 | 911 // Grab the node that defines this monitor |
|
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912 Node* box_node = sfn->monitor_box(jvms, idx); |
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913 Node* obj_node = sfn->monitor_obj(jvms, idx); |
| 0 | 914 |
| 915 // Create ScopeValue for object | |
| 916 ScopeValue *scval = NULL; | |
|
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917 |
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918 if (obj_node->is_SafePointScalarObject()) { |
|
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919 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject(); |
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920 scval = Compile::sv_for_node_id(objs, spobj->_idx); |
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921 if (scval == NULL) { |
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922 const Type *t = spobj->bottom_type(); |
|
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923 ciKlass* cik = t->is_oopptr()->klass(); |
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924 assert(cik->is_instance_klass() || |
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925 cik->is_array_klass(), "Not supported allocation."); |
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926 ObjectValue* sv = new ObjectValue(spobj->_idx, |
|
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927 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding())); |
|
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928 Compile::set_sv_for_object_node(objs, sv); |
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929 |
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930 uint first_ind = spobj->first_index(youngest_jvms); |
|
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931 for (uint i = 0; i < spobj->n_fields(); i++) { |
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932 Node* fld_node = sfn->in(first_ind+i); |
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933 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs); |
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934 } |
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935 scval = sv; |
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936 } |
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937 } else if (!obj_node->is_Con()) { |
| 0 | 938 OptoReg::Name obj_reg = _regalloc->get_reg_first(obj_node); |
|
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939 if( obj_node->bottom_type()->base() == Type::NarrowOop ) { |
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940 scval = new_loc_value( _regalloc, obj_reg, Location::narrowoop ); |
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941 } else { |
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942 scval = new_loc_value( _regalloc, obj_reg, Location::oop ); |
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943 } |
| 0 | 944 } else { |
|
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945 const TypePtr *tp = obj_node->get_ptr_type(); |
|
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946 scval = new ConstantOopWriteValue(tp->is_oopptr()->const_oop()->constant_encoding()); |
| 0 | 947 } |
| 948 | |
| 4777 | 949 OptoReg::Name box_reg = BoxLockNode::reg(box_node); |
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950 Location basic_lock = Location::new_stk_loc(Location::normal,_regalloc->reg2offset(box_reg)); |
| 4777 | 951 bool eliminated = (box_node->is_BoxLock() && box_node->as_BoxLock()->is_eliminated()); |
| 952 monarray->append(new MonitorValue(scval, basic_lock, eliminated)); | |
| 0 | 953 } |
| 954 | |
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955 // We dump the object pool first, since deoptimization reads it in first. |
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956 debug_info()->dump_object_pool(objs); |
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957 |
| 0 | 958 // Build first class objects to pass to scope |
| 959 DebugToken *locvals = debug_info()->create_scope_values(locarray); | |
| 960 DebugToken *expvals = debug_info()->create_scope_values(exparray); | |
| 961 DebugToken *monvals = debug_info()->create_monitor_values(monarray); | |
| 962 | |
| 963 // Make method available for all Safepoints | |
| 964 ciMethod* scope_method = method ? method : _method; | |
| 965 // Describe the scope here | |
| 966 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI"); | |
|
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967 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest"); |
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968 // Now we can describe the scope. |
|
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969 debug_info()->describe_scope(safepoint_pc_offset, scope_method, jvms->bci(), jvms->should_reexecute(), is_method_handle_invoke, return_oop, locvals, expvals, monvals); |
| 0 | 970 } // End jvms loop |
| 971 | |
| 972 // Mark the end of the scope set. | |
| 973 debug_info()->end_safepoint(safepoint_pc_offset); | |
| 974 } | |
| 975 | |
| 976 | |
| 977 | |
| 978 // A simplified version of Process_OopMap_Node, to handle non-safepoints. | |
| 979 class NonSafepointEmitter { | |
| 980 Compile* C; | |
| 981 JVMState* _pending_jvms; | |
| 982 int _pending_offset; | |
| 983 | |
| 984 void emit_non_safepoint(); | |
| 985 | |
| 986 public: | |
| 987 NonSafepointEmitter(Compile* compile) { | |
| 988 this->C = compile; | |
| 989 _pending_jvms = NULL; | |
| 990 _pending_offset = 0; | |
| 991 } | |
| 992 | |
| 993 void observe_instruction(Node* n, int pc_offset) { | |
| 994 if (!C->debug_info()->recording_non_safepoints()) return; | |
| 995 | |
| 996 Node_Notes* nn = C->node_notes_at(n->_idx); | |
| 997 if (nn == NULL || nn->jvms() == NULL) return; | |
| 998 if (_pending_jvms != NULL && | |
| 999 _pending_jvms->same_calls_as(nn->jvms())) { | |
| 1000 // Repeated JVMS? Stretch it up here. | |
| 1001 _pending_offset = pc_offset; | |
| 1002 } else { | |
| 1003 if (_pending_jvms != NULL && | |
| 1004 _pending_offset < pc_offset) { | |
| 1005 emit_non_safepoint(); | |
| 1006 } | |
| 1007 _pending_jvms = NULL; | |
| 1008 if (pc_offset > C->debug_info()->last_pc_offset()) { | |
| 1009 // This is the only way _pending_jvms can become non-NULL: | |
| 1010 _pending_jvms = nn->jvms(); | |
| 1011 _pending_offset = pc_offset; | |
| 1012 } | |
| 1013 } | |
| 1014 } | |
| 1015 | |
| 1016 // Stay out of the way of real safepoints: | |
| 1017 void observe_safepoint(JVMState* jvms, int pc_offset) { | |
| 1018 if (_pending_jvms != NULL && | |
| 1019 !_pending_jvms->same_calls_as(jvms) && | |
| 1020 _pending_offset < pc_offset) { | |
| 1021 emit_non_safepoint(); | |
| 1022 } | |
| 1023 _pending_jvms = NULL; | |
| 1024 } | |
| 1025 | |
| 1026 void flush_at_end() { | |
| 1027 if (_pending_jvms != NULL) { | |
| 1028 emit_non_safepoint(); | |
| 1029 } | |
| 1030 _pending_jvms = NULL; | |
| 1031 } | |
| 1032 }; | |
| 1033 | |
| 1034 void NonSafepointEmitter::emit_non_safepoint() { | |
| 1035 JVMState* youngest_jvms = _pending_jvms; | |
| 1036 int pc_offset = _pending_offset; | |
| 1037 | |
| 1038 // Clear it now: | |
| 1039 _pending_jvms = NULL; | |
| 1040 | |
| 1041 DebugInformationRecorder* debug_info = C->debug_info(); | |
| 1042 assert(debug_info->recording_non_safepoints(), "sanity"); | |
| 1043 | |
| 1044 debug_info->add_non_safepoint(pc_offset); | |
| 1045 int max_depth = youngest_jvms->depth(); | |
| 1046 | |
| 1047 // Visit scopes from oldest to youngest. | |
| 1048 for (int depth = 1; depth <= max_depth; depth++) { | |
| 1049 JVMState* jvms = youngest_jvms->of_depth(depth); | |
| 1050 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
|
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1051 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest"); |
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1052 debug_info->describe_scope(pc_offset, method, jvms->bci(), jvms->should_reexecute()); |
| 0 | 1053 } |
| 1054 | |
| 1055 // Mark the end of the scope set. | |
| 1056 debug_info->end_non_safepoint(pc_offset); | |
| 1057 } | |
| 1058 | |
| 3851 | 1059 //------------------------------init_buffer------------------------------------ |
| 1060 CodeBuffer* Compile::init_buffer(uint* blk_starts) { | |
| 0 | 1061 |
| 1062 // Set the initially allocated size | |
| 1063 int code_req = initial_code_capacity; | |
| 1064 int locs_req = initial_locs_capacity; | |
| 1065 int stub_req = TraceJumps ? initial_stub_capacity * 10 : initial_stub_capacity; | |
| 1066 int const_req = initial_const_capacity; | |
| 1067 | |
| 1068 int pad_req = NativeCall::instruction_size; | |
| 1069 // The extra spacing after the code is necessary on some platforms. | |
| 1070 // Sometimes we need to patch in a jump after the last instruction, | |
| 1071 // if the nmethod has been deoptimized. (See 4932387, 4894843.) | |
| 1072 | |
| 1073 // Compute the byte offset where we can store the deopt pc. | |
| 1074 if (fixed_slots() != 0) { | |
| 1075 _orig_pc_slot_offset_in_bytes = _regalloc->reg2offset(OptoReg::stack2reg(_orig_pc_slot)); | |
| 1076 } | |
| 1077 | |
| 1078 // Compute prolog code size | |
| 1079 _method_size = 0; | |
| 1080 _frame_slots = OptoReg::reg2stack(_matcher->_old_SP)+_regalloc->_framesize; | |
| 1081 #ifdef IA64 | |
| 1082 if (save_argument_registers()) { | |
| 1083 // 4815101: this is a stub with implicit and unknown precision fp args. | |
| 1084 // The usual spill mechanism can only generate stfd's in this case, which | |
| 1085 // doesn't work if the fp reg to spill contains a single-precision denorm. | |
| 1086 // Instead, we hack around the normal spill mechanism using stfspill's and | |
| 1087 // ldffill's in the MachProlog and MachEpilog emit methods. We allocate | |
| 1088 // space here for the fp arg regs (f8-f15) we're going to thusly spill. | |
| 1089 // | |
| 1090 // If we ever implement 16-byte 'registers' == stack slots, we can | |
| 1091 // get rid of this hack and have SpillCopy generate stfspill/ldffill | |
| 1092 // instead of stfd/stfs/ldfd/ldfs. | |
| 1093 _frame_slots += 8*(16/BytesPerInt); | |
| 1094 } | |
| 1095 #endif | |
| 3851 | 1096 assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check"); |
| 0 | 1097 |
| 2008 | 1098 if (has_mach_constant_base_node()) { |
| 1099 // Fill the constant table. | |
| 3851 | 1100 // Note: This must happen before shorten_branches. |
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1101 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
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1102 Block* b = _cfg->get_block(i); |
| 2008 | 1103 |
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1104 for (uint j = 0; j < b->number_of_nodes(); j++) { |
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1105 Node* n = b->get_node(j); |
| 2008 | 1106 |
| 1107 // If the node is a MachConstantNode evaluate the constant | |
| 1108 // value section. | |
| 1109 if (n->is_MachConstant()) { | |
| 1110 MachConstantNode* machcon = n->as_MachConstant(); | |
| 1111 machcon->eval_constant(C); | |
| 1112 } | |
| 1113 } | |
| 1114 } | |
| 1115 | |
| 1116 // Calculate the offsets of the constants and the size of the | |
| 1117 // constant table (including the padding to the next section). | |
| 1118 constant_table().calculate_offsets_and_size(); | |
| 1119 const_req = constant_table().size(); | |
| 1120 } | |
| 1121 | |
| 1122 // Initialize the space for the BufferBlob used to find and verify | |
| 1123 // instruction size in MachNode::emit_size() | |
| 1124 init_scratch_buffer_blob(const_req); | |
| 3851 | 1125 if (failing()) return NULL; // Out of memory |
| 1126 | |
| 1127 // Pre-compute the length of blocks and replace | |
| 1128 // long branches with short if machine supports it. | |
| 1129 shorten_branches(blk_starts, code_req, locs_req, stub_req); | |
| 0 | 1130 |
| 1131 // nmethod and CodeBuffer count stubs & constants as part of method's code. | |
| 1132 int exception_handler_req = size_exception_handler(); | |
| 1133 int deopt_handler_req = size_deopt_handler(); | |
| 1134 exception_handler_req += MAX_stubs_size; // add marginal slop for handler | |
| 1135 deopt_handler_req += MAX_stubs_size; // add marginal slop for handler | |
| 1136 stub_req += MAX_stubs_size; // ensure per-stub margin | |
| 1137 code_req += MAX_inst_size; // ensure per-instruction margin | |
| 1265 | 1138 |
| 0 | 1139 if (StressCodeBuffers) |
| 1140 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion | |
| 1265 | 1141 |
| 1142 int total_req = | |
| 2008 | 1143 const_req + |
| 1265 | 1144 code_req + |
| 1145 pad_req + | |
| 1146 stub_req + | |
| 1147 exception_handler_req + | |
| 2008 | 1148 deopt_handler_req; // deopt handler |
| 1265 | 1149 |
| 1150 if (has_method_handle_invokes()) | |
| 1151 total_req += deopt_handler_req; // deopt MH handler | |
| 1152 | |
| 0 | 1153 CodeBuffer* cb = code_buffer(); |
| 1154 cb->initialize(total_req, locs_req); | |
| 1155 | |
| 1156 // Have we run out of code space? | |
| 1202 | 1157 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
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1158 C->record_failure("CodeCache is full"); |
| 3851 | 1159 return NULL; |
| 0 | 1160 } |
| 1161 // Configure the code buffer. | |
| 1162 cb->initialize_consts_size(const_req); | |
| 1163 cb->initialize_stubs_size(stub_req); | |
| 1164 cb->initialize_oop_recorder(env()->oop_recorder()); | |
| 1165 | |
| 1166 // fill in the nop array for bundling computations | |
| 1167 MachNode *_nop_list[Bundle::_nop_count]; | |
| 1168 Bundle::initialize_nops(_nop_list, this); | |
| 1169 | |
| 3851 | 1170 return cb; |
| 1171 } | |
| 1172 | |
| 1173 //------------------------------fill_buffer------------------------------------ | |
| 1174 void Compile::fill_buffer(CodeBuffer* cb, uint* blk_starts) { | |
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1175 // blk_starts[] contains offsets calculated during short branches processing, |
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1176 // offsets should not be increased during following steps. |
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1177 |
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1178 // Compute the size of first NumberOfLoopInstrToAlign instructions at head |
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1179 // of a loop. It is used to determine the padding for loop alignment. |
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1180 compute_loop_first_inst_sizes(); |
| 3851 | 1181 |
| 0 | 1182 // Create oopmap set. |
| 1183 _oop_map_set = new OopMapSet(); | |
| 1184 | |
| 1185 // !!!!! This preserves old handling of oopmaps for now | |
| 1186 debug_info()->set_oopmaps(_oop_map_set); | |
| 1187 | |
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1188 uint nblocks = _cfg->number_of_blocks(); |
| 0 | 1189 // Count and start of implicit null check instructions |
| 1190 uint inct_cnt = 0; | |
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1191 uint *inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1); |
| 0 | 1192 |
| 1193 // Count and start of calls | |
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1194 uint *call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1); |
| 0 | 1195 |
| 1196 uint return_offset = 0; | |
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1197 int nop_size = (new (this) MachNopNode())->size(_regalloc); |
| 0 | 1198 |
| 1199 int previous_offset = 0; | |
| 1200 int current_offset = 0; | |
| 1201 int last_call_offset = -1; | |
| 3851 | 1202 int last_avoid_back_to_back_offset = -1; |
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1203 #ifdef ASSERT |
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1204 uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1205 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1206 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks); |
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1207 uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); |
| 3851 | 1208 #endif |
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1209 |
| 0 | 1210 // Create an array of unused labels, one for each basic block, if printing is enabled |
| 1211 #ifndef PRODUCT | |
| 1212 int *node_offsets = NULL; | |
| 3851 | 1213 uint node_offset_limit = unique(); |
| 1214 | |
| 1215 if (print_assembly()) | |
| 0 | 1216 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit); |
| 1217 #endif | |
| 1218 | |
| 1219 NonSafepointEmitter non_safepoints(this); // emit non-safepoints lazily | |
| 1220 | |
| 2008 | 1221 // Emit the constant table. |
| 1222 if (has_mach_constant_base_node()) { | |
| 1223 constant_table().emit(*cb); | |
| 1224 } | |
| 1225 | |
| 3851 | 1226 // Create an array of labels, one for each basic block |
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1227 Label *blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1); |
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1228 for (uint i=0; i <= nblocks; i++) { |
| 3851 | 1229 blk_labels[i].init(); |
| 1230 } | |
| 1231 | |
| 0 | 1232 // ------------------ |
| 1233 // Now fill in the code buffer | |
| 1234 Node *delay_slot = NULL; | |
| 1235 | |
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1236 for (uint i = 0; i < nblocks; i++) { |
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1237 Block* block = _cfg->get_block(i); |
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1238 Node* head = block->head(); |
| 0 | 1239 |
| 1240 // If this block needs to start aligned (i.e, can be reached other | |
| 1241 // than by falling-thru from the previous block), then force the | |
| 1242 // start of a new bundle. | |
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1243 if (Pipeline::requires_bundling() && starts_bundle(head)) { |
| 0 | 1244 cb->flush_bundle(true); |
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1245 } |
| 0 | 1246 |
| 3851 | 1247 #ifdef ASSERT |
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1248 if (!block->is_connector()) { |
| 3851 | 1249 stringStream st; |
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1250 block->dump_head(_cfg, &st); |
| 3851 | 1251 MacroAssembler(cb).block_comment(st.as_string()); |
| 1252 } | |
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1253 jmp_target[i] = 0; |
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1254 jmp_offset[i] = 0; |
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1255 jmp_size[i] = 0; |
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1256 jmp_rule[i] = 0; |
| 3851 | 1257 #endif |
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1258 int blk_offset = current_offset; |
| 3851 | 1259 |
| 0 | 1260 // Define the label at the beginning of the basic block |
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1261 MacroAssembler(cb).bind(blk_labels[block->_pre_order]); |
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1262 |
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1263 uint last_inst = block->number_of_nodes(); |
| 0 | 1264 |
| 1265 // Emit block normally, except for last instruction. | |
| 1266 // Emit means "dump code bits into code buffer". | |
| 3851 | 1267 for (uint j = 0; j<last_inst; j++) { |
| 0 | 1268 |
| 1269 // Get the node | |
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1270 Node* n = block->get_node(j); |
| 0 | 1271 |
| 1272 // See if delay slots are supported | |
| 1273 if (valid_bundle_info(n) && | |
| 1274 node_bundling(n)->used_in_unconditional_delay()) { | |
| 1275 assert(delay_slot == NULL, "no use of delay slot node"); | |
| 1276 assert(n->size(_regalloc) == Pipeline::instr_unit_size(), "delay slot instruction wrong size"); | |
| 1277 | |
| 1278 delay_slot = n; | |
| 1279 continue; | |
| 1280 } | |
| 1281 | |
| 1282 // If this starts a new instruction group, then flush the current one | |
| 1283 // (but allow split bundles) | |
| 3851 | 1284 if (Pipeline::requires_bundling() && starts_bundle(n)) |
| 0 | 1285 cb->flush_bundle(false); |
| 1286 | |
| 1287 // The following logic is duplicated in the code ifdeffed for | |
| 605 | 1288 // ENABLE_ZAP_DEAD_LOCALS which appears above in this file. It |
| 0 | 1289 // should be factored out. Or maybe dispersed to the nodes? |
| 1290 | |
| 1291 // Special handling for SafePoint/Call Nodes | |
| 1292 bool is_mcall = false; | |
| 3851 | 1293 if (n->is_Mach()) { |
| 0 | 1294 MachNode *mach = n->as_Mach(); |
| 1295 is_mcall = n->is_MachCall(); | |
| 1296 bool is_sfn = n->is_MachSafePoint(); | |
| 1297 | |
| 1298 // If this requires all previous instructions be flushed, then do so | |
| 3851 | 1299 if (is_sfn || is_mcall || mach->alignment_required() != 1) { |
| 0 | 1300 cb->flush_bundle(true); |
| 1748 | 1301 current_offset = cb->insts_size(); |
| 0 | 1302 } |
| 1303 | |
| 3851 | 1304 // A padding may be needed again since a previous instruction |
| 1305 // could be moved to delay slot. | |
| 1306 | |
| 0 | 1307 // align the instruction if necessary |
| 1308 int padding = mach->compute_padding(current_offset); | |
| 1309 // Make sure safepoint node for polling is distinct from a call's | |
| 1310 // return by adding a nop if needed. | |
| 3851 | 1311 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) { |
| 0 | 1312 padding = nop_size; |
| 1313 } | |
| 3851 | 1314 if (padding == 0 && mach->avoid_back_to_back() && |
| 1315 current_offset == last_avoid_back_to_back_offset) { | |
| 1316 // Avoid back to back some instructions. | |
| 1317 padding = nop_size; | |
| 0 | 1318 } |
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1319 |
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1320 if(padding > 0) { |
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1321 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); |
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1322 int nops_cnt = padding / nop_size; |
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1323 MachNode *nop = new (this) MachNopNode(nops_cnt); |
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1324 block->insert_node(nop, j++); |
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1325 last_inst++; |
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1326 _cfg->map_node_to_block(nop, block); |
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1327 nop->emit(*cb, _regalloc); |
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1328 cb->flush_bundle(true); |
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1329 current_offset = cb->insts_size(); |
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1330 } |
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1331 |
| 0 | 1332 // Remember the start of the last call in a basic block |
| 1333 if (is_mcall) { | |
| 1334 MachCallNode *mcall = mach->as_MachCall(); | |
| 1335 | |
| 1336 // This destination address is NOT PC-relative | |
| 1337 mcall->method_set((intptr_t)mcall->entry_point()); | |
| 1338 | |
| 1339 // Save the return address | |
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1340 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset(); |
| 0 | 1341 |
| 3842 | 1342 if (mcall->is_MachCallLeaf()) { |
| 0 | 1343 is_mcall = false; |
| 1344 is_sfn = false; | |
| 1345 } | |
| 1346 } | |
| 1347 | |
| 1348 // sfn will be valid whenever mcall is valid now because of inheritance | |
| 3851 | 1349 if (is_sfn || is_mcall) { |
| 0 | 1350 |
| 1351 // Handle special safepoint nodes for synchronization | |
| 3851 | 1352 if (!is_mcall) { |
| 0 | 1353 MachSafePointNode *sfn = mach->as_MachSafePoint(); |
| 1354 // !!!!! Stubs only need an oopmap right now, so bail out | |
| 3851 | 1355 if (sfn->jvms()->method() == NULL) { |
| 0 | 1356 // Write the oopmap directly to the code blob??!! |
| 1357 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 1358 assert( !is_node_getting_a_safepoint(sfn), "logic does not match; false positive"); | |
| 1359 # endif | |
| 1360 continue; | |
| 1361 } | |
| 1362 } // End synchronization | |
| 1363 | |
| 1364 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
| 1365 current_offset); | |
| 1366 Process_OopMap_Node(mach, current_offset); | |
| 1367 } // End if safepoint | |
| 1368 | |
| 1369 // If this is a null check, then add the start of the previous instruction to the list | |
| 1370 else if( mach->is_MachNullCheck() ) { | |
| 1371 inct_starts[inct_cnt++] = previous_offset; | |
| 1372 } | |
| 1373 | |
| 1374 // If this is a branch, then fill in the label with the target BB's label | |
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1375 else if (mach->is_MachBranch()) { |
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1376 // This requires the TRUE branch target be in succs[0] |
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1377 uint block_num = block->non_connector_successor(0)->_pre_order; |
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1378 |
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1379 // Try to replace long branch if delay slot is not used, |
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1380 // it is mostly for back branches since forward branch's |
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1381 // distance is not updated yet. |
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1382 bool delay_slot_is_used = valid_bundle_info(n) && |
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1383 node_bundling(n)->use_unconditional_delay(); |
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1384 if (!delay_slot_is_used && mach->may_be_short_branch()) { |
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1385 assert(delay_slot == NULL, "not expecting delay slot node"); |
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1386 int br_size = n->size(_regalloc); |
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1387 int offset = blk_starts[block_num] - current_offset; |
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1388 if (block_num >= i) { |
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1389 // Current and following block's offset are not |
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1390 // finilized yet, adjust distance by the difference |
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1391 // between calculated and final offsets of current block. |
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1392 offset -= (blk_starts[i] - blk_offset); |
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1393 } |
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1394 // In the following code a nop could be inserted before |
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1395 // the branch which will increase the backward distance. |
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1396 bool needs_padding = (current_offset == last_avoid_back_to_back_offset); |
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1397 if (needs_padding && offset <= 0) |
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1398 offset -= nop_size; |
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1399 |
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1400 if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) { |
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1401 // We've got a winner. Replace this branch. |
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1402 MachNode* replacement = mach->as_MachBranch()->short_branch_version(this); |
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1403 |
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1404 // Update the jmp_size. |
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1405 int new_size = replacement->size(_regalloc); |
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1406 assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller"); |
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1407 // Insert padding between avoid_back_to_back branches. |
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1408 if (needs_padding && replacement->avoid_back_to_back()) { |
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1409 MachNode *nop = new (this) MachNopNode(); |
|
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1410 block->insert_node(nop, j++); |
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1411 _cfg->map_node_to_block(nop, block); |
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1412 last_inst++; |
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1413 nop->emit(*cb, _regalloc); |
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1414 cb->flush_bundle(true); |
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1415 current_offset = cb->insts_size(); |
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1416 } |
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1417 #ifdef ASSERT |
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1418 jmp_target[i] = block_num; |
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1419 jmp_offset[i] = current_offset - blk_offset; |
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1420 jmp_size[i] = new_size; |
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1421 jmp_rule[i] = mach->rule(); |
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1422 #endif |
|
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1423 block->map_node(replacement, j); |
|
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1424 mach->subsume_by(replacement, C); |
|
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1425 n = replacement; |
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1426 mach = replacement; |
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1427 } |
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1428 } |
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1429 mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num ); |
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1430 } else if (mach->ideal_Opcode() == Op_Jump) { |
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1431 for (uint h = 0; h < block->_num_succs; h++) { |
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1432 Block* succs_block = block->_succs[h]; |
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1433 for (uint j = 1; j < succs_block->num_preds(); j++) { |
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1434 Node* jpn = succs_block->pred(j); |
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1435 if (jpn->is_JumpProj() && jpn->in(0) == mach) { |
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1436 uint block_num = succs_block->non_connector()->_pre_order; |
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1437 Label *blkLabel = &blk_labels[block_num]; |
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1438 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel); |
| 0 | 1439 } |
| 1440 } | |
| 1441 } | |
| 1442 } | |
| 1443 #ifdef ASSERT | |
| 605 | 1444 // Check that oop-store precedes the card-mark |
| 3851 | 1445 else if (mach->ideal_Opcode() == Op_StoreCM) { |
| 0 | 1446 uint storeCM_idx = j; |
|
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1447 int count = 0; |
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1448 for (uint prec = mach->req(); prec < mach->len(); prec++) { |
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1449 Node *oop_store = mach->in(prec); // Precedence edge |
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1450 if (oop_store == NULL) continue; |
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1451 count++; |
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1452 uint i4; |
|
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1453 for (i4 = 0; i4 < last_inst; ++i4) { |
|
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1454 if (block->get_node(i4) == oop_store) { |
|
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1455 break; |
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1456 } |
|
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1457 } |
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1458 // Note: This test can provide a false failure if other precedence |
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1459 // edges have been added to the storeCMNode. |
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1460 assert(i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store"); |
| 0 | 1461 } |
|
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1462 assert(count > 0, "storeCM expects at least one precedence edge"); |
| 0 | 1463 } |
| 1464 #endif | |
| 3851 | 1465 else if (!n->is_Proj()) { |
| 605 | 1466 // Remember the beginning of the previous instruction, in case |
| 0 | 1467 // it's followed by a flag-kill and a null-check. Happens on |
| 1468 // Intel all the time, with add-to-memory kind of opcodes. | |
| 1469 previous_offset = current_offset; | |
| 1470 } | |
| 1471 } | |
| 1472 | |
| 1473 // Verify that there is sufficient space remaining | |
| 1474 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size); | |
| 1202 | 1475 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
|
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1476 C->record_failure("CodeCache is full"); |
| 0 | 1477 return; |
| 1478 } | |
| 1479 | |
| 1480 // Save the offset for the listing | |
| 1481 #ifndef PRODUCT | |
| 3851 | 1482 if (node_offsets && n->_idx < node_offset_limit) |
| 1748 | 1483 node_offsets[n->_idx] = cb->insts_size(); |
| 0 | 1484 #endif |
| 1485 | |
| 1486 // "Normal" instruction case | |
| 3851 | 1487 DEBUG_ONLY( uint instr_offset = cb->insts_size(); ) |
| 0 | 1488 n->emit(*cb, _regalloc); |
| 1748 | 1489 current_offset = cb->insts_size(); |
| 3851 | 1490 |
| 1491 #ifdef ASSERT | |
|
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1492 if (n->size(_regalloc) < (current_offset-instr_offset)) { |
| 3851 | 1493 n->dump(); |
|
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1494 assert(false, "wrong size of mach node"); |
| 3851 | 1495 } |
| 1496 #endif | |
| 0 | 1497 non_safepoints.observe_instruction(n, current_offset); |
| 1498 | |
| 1499 // mcall is last "call" that can be a safepoint | |
| 1500 // record it so we can see if a poll will directly follow it | |
| 1501 // in which case we'll need a pad to make the PcDesc sites unique | |
| 1502 // see 5010568. This can be slightly inaccurate but conservative | |
| 1503 // in the case that return address is not actually at current_offset. | |
| 1504 // This is a small price to pay. | |
| 1505 | |
| 1506 if (is_mcall) { | |
| 1507 last_call_offset = current_offset; | |
| 1508 } | |
| 1509 | |
| 3851 | 1510 if (n->is_Mach() && n->as_Mach()->avoid_back_to_back()) { |
| 1511 // Avoid back to back some instructions. | |
| 1512 last_avoid_back_to_back_offset = current_offset; | |
| 1513 } | |
| 1514 | |
| 0 | 1515 // See if this instruction has a delay slot |
| 3851 | 1516 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { |
| 0 | 1517 assert(delay_slot != NULL, "expecting delay slot node"); |
| 1518 | |
| 1519 // Back up 1 instruction | |
| 1748 | 1520 cb->set_insts_end(cb->insts_end() - Pipeline::instr_unit_size()); |
| 0 | 1521 |
| 1522 // Save the offset for the listing | |
| 1523 #ifndef PRODUCT | |
| 3851 | 1524 if (node_offsets && delay_slot->_idx < node_offset_limit) |
| 1748 | 1525 node_offsets[delay_slot->_idx] = cb->insts_size(); |
| 0 | 1526 #endif |
| 1527 | |
| 1528 // Support a SafePoint in the delay slot | |
| 3851 | 1529 if (delay_slot->is_MachSafePoint()) { |
| 0 | 1530 MachNode *mach = delay_slot->as_Mach(); |
| 1531 // !!!!! Stubs only need an oopmap right now, so bail out | |
| 3851 | 1532 if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL) { |
| 0 | 1533 // Write the oopmap directly to the code blob??!! |
| 1534 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 1535 assert( !is_node_getting_a_safepoint(mach), "logic does not match; false positive"); | |
| 1536 # endif | |
| 1537 delay_slot = NULL; | |
| 1538 continue; | |
| 1539 } | |
| 1540 | |
| 1541 int adjusted_offset = current_offset - Pipeline::instr_unit_size(); | |
| 1542 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
| 1543 adjusted_offset); | |
| 1544 // Generate an OopMap entry | |
| 1545 Process_OopMap_Node(mach, adjusted_offset); | |
| 1546 } | |
| 1547 | |
| 1548 // Insert the delay slot instruction | |
| 1549 delay_slot->emit(*cb, _regalloc); | |
| 1550 | |
| 1551 // Don't reuse it | |
| 1552 delay_slot = NULL; | |
| 1553 } | |
| 1554 | |
| 1555 } // End for all instructions in block | |
|
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1556 |
| 418 | 1557 // If the next block is the top of a loop, pad this block out to align |
| 1558 // the loop top a little. Helps prevent pipe stalls at loop back branches. | |
|
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1559 if (i < nblocks-1) { |
|
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1560 Block *nb = _cfg->get_block(i + 1); |
|
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1561 int padding = nb->alignment_padding(current_offset); |
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1562 if( padding > 0 ) { |
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1563 MachNode *nop = new (this) MachNopNode(padding / nop_size); |
|
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1564 block->insert_node(nop, block->number_of_nodes()); |
|
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1565 _cfg->map_node_to_block(nop, block); |
|
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1566 nop->emit(*cb, _regalloc); |
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1567 current_offset = cb->insts_size(); |
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1568 } |
| 0 | 1569 } |
|
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1570 // Verify that the distance for generated before forward |
|
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1571 // short branches is still valid. |
|
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1572 guarantee((int)(blk_starts[i+1] - blk_starts[i]) >= (current_offset - blk_offset), "shouldn't increase block size"); |
|
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1573 |
|
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1574 // Save new block start offset |
|
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1575 blk_starts[i] = blk_offset; |
| 0 | 1576 } // End of for all blocks |
|
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1577 blk_starts[nblocks] = current_offset; |
| 0 | 1578 |
| 1579 non_safepoints.flush_at_end(); | |
| 1580 | |
| 1581 // Offset too large? | |
| 1582 if (failing()) return; | |
| 1583 | |
| 1584 // Define a pseudo-label at the end of the code | |
|
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1585 MacroAssembler(cb).bind( blk_labels[nblocks] ); |
| 0 | 1586 |
| 1587 // Compute the size of the first block | |
| 1588 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos(); | |
| 1589 | |
| 1748 | 1590 assert(cb->insts_size() < 500000, "method is unreasonably large"); |
| 0 | 1591 |
|
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1592 #ifdef ASSERT |
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1593 for (uint i = 0; i < nblocks; i++) { // For all blocks |
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1594 if (jmp_target[i] != 0) { |
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1595 int br_size = jmp_size[i]; |
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1596 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]); |
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1597 if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) { |
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1598 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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1599 assert(false, "Displacement too large for short jmp"); |
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1600 } |
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1601 } |
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1602 } |
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1603 #endif |
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1604 |
| 0 | 1605 #ifndef PRODUCT |
| 1606 // Information on the size of the method, without the extraneous code | |
| 1748 | 1607 Scheduling::increment_method_size(cb->insts_size()); |
| 0 | 1608 #endif |
| 1609 | |
| 1610 // ------------------ | |
| 1611 // Fill in exception table entries. | |
| 1612 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels); | |
| 1613 | |
| 1614 // Only java methods have exception handlers and deopt handlers | |
| 1615 if (_method) { | |
| 1616 // Emit the exception handler code. | |
| 1617 _code_offsets.set_value(CodeOffsets::Exceptions, emit_exception_handler(*cb)); | |
| 1618 // Emit the deopt handler code. | |
| 1619 _code_offsets.set_value(CodeOffsets::Deopt, emit_deopt_handler(*cb)); | |
| 1265 | 1620 |
| 1621 // Emit the MethodHandle deopt handler code (if required). | |
| 1622 if (has_method_handle_invokes()) { | |
| 1623 // We can use the same code as for the normal deopt handler, we | |
| 1624 // just need a different entry point address. | |
| 1625 _code_offsets.set_value(CodeOffsets::DeoptMH, emit_deopt_handler(*cb)); | |
| 1626 } | |
| 0 | 1627 } |
| 1628 | |
| 1629 // One last check for failed CodeBuffer::expand: | |
| 1202 | 1630 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) { |
|
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1631 C->record_failure("CodeCache is full"); |
| 0 | 1632 return; |
| 1633 } | |
| 1634 | |
| 1635 #ifndef PRODUCT | |
| 1636 // Dump the assembly code, including basic-block numbers | |
| 1637 if (print_assembly()) { | |
| 1638 ttyLocker ttyl; // keep the following output all in one block | |
| 1639 if (!VMThread::should_terminate()) { // test this under the tty lock | |
| 1640 // This output goes directly to the tty, not the compiler log. | |
| 1641 // To enable tools to match it up with the compilation activity, | |
| 1642 // be sure to tag this tty output with the compile ID. | |
| 1643 if (xtty != NULL) { | |
| 1644 xtty->head("opto_assembly compile_id='%d'%s", compile_id(), | |
| 1645 is_osr_compilation() ? " compile_kind='osr'" : | |
| 1646 ""); | |
| 1647 } | |
| 1648 if (method() != NULL) { | |
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1649 method()->print_metadata(); |
| 0 | 1650 } |
| 1651 dump_asm(node_offsets, node_offset_limit); | |
| 1652 if (xtty != NULL) { | |
| 1653 xtty->tail("opto_assembly"); | |
| 1654 } | |
| 1655 } | |
| 1656 } | |
| 1657 #endif | |
| 1658 | |
| 1659 } | |
| 1660 | |
| 1661 void Compile::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) { | |
| 1662 _inc_table.set_size(cnt); | |
| 1663 | |
| 1664 uint inct_cnt = 0; | |
|
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1665 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { |
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1666 Block* block = _cfg->get_block(i); |
| 0 | 1667 Node *n = NULL; |
| 1668 int j; | |
| 1669 | |
| 1670 // Find the branch; ignore trailing NOPs. | |
|
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1671 for (j = block->number_of_nodes() - 1; j >= 0; j--) { |
|
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1672 n = block->get_node(j); |
|
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1673 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) { |
| 0 | 1674 break; |
|
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1675 } |
| 0 | 1676 } |
| 1677 | |
| 1678 // If we didn't find anything, continue | |
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1679 if (j < 0) { |
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1680 continue; |
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1681 } |
| 0 | 1682 |
| 1683 // Compute ExceptionHandlerTable subtable entry and add it | |
| 1684 // (skip empty blocks) | |
|
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1685 if (n->is_Catch()) { |
| 0 | 1686 |
| 1687 // Get the offset of the return from the call | |
|
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1688 uint call_return = call_returns[block->_pre_order]; |
| 0 | 1689 #ifdef ASSERT |
| 1690 assert( call_return > 0, "no call seen for this basic block" ); | |
|
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1691 while (block->get_node(--j)->is_MachProj()) ; |
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1692 assert(block->get_node(j)->is_MachCall(), "CatchProj must follow call"); |
| 0 | 1693 #endif |
| 1694 // last instruction is a CatchNode, find it's CatchProjNodes | |
|
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1695 int nof_succs = block->_num_succs; |
| 0 | 1696 // allocate space |
| 1697 GrowableArray<intptr_t> handler_bcis(nof_succs); | |
| 1698 GrowableArray<intptr_t> handler_pcos(nof_succs); | |
| 1699 // iterate through all successors | |
| 1700 for (int j = 0; j < nof_succs; j++) { | |
|
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1701 Block* s = block->_succs[j]; |
| 0 | 1702 bool found_p = false; |
|
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1703 for (uint k = 1; k < s->num_preds(); k++) { |
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1704 Node* pk = s->pred(k); |
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1705 if (pk->is_CatchProj() && pk->in(0) == n) { |
| 0 | 1706 const CatchProjNode* p = pk->as_CatchProj(); |
| 1707 found_p = true; | |
| 1708 // add the corresponding handler bci & pco information | |
|
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1709 if (p->_con != CatchProjNode::fall_through_index) { |
| 0 | 1710 // p leads to an exception handler (and is not fall through) |
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1711 assert(s == _cfg->get_block(s->_pre_order), "bad numbering"); |
| 0 | 1712 // no duplicates, please |
|
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1713 if (!handler_bcis.contains(p->handler_bci())) { |
| 0 | 1714 uint block_num = s->non_connector()->_pre_order; |
| 1715 handler_bcis.append(p->handler_bci()); | |
| 1716 handler_pcos.append(blk_labels[block_num].loc_pos()); | |
| 1717 } | |
| 1718 } | |
| 1719 } | |
| 1720 } | |
| 1721 assert(found_p, "no matching predecessor found"); | |
| 1722 // Note: Due to empty block removal, one block may have | |
| 1723 // several CatchProj inputs, from the same Catch. | |
| 1724 } | |
| 1725 | |
| 1726 // Set the offset of the return from the call | |
| 1727 _handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos); | |
| 1728 continue; | |
| 1729 } | |
| 1730 | |
| 1731 // Handle implicit null exception table updates | |
|
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1732 if (n->is_MachNullCheck()) { |
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1733 uint block_num = block->non_connector_successor(0)->_pre_order; |
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1734 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos()); |
| 0 | 1735 continue; |
| 1736 } | |
| 1737 } // End of for all blocks fill in exception table entries | |
| 1738 } | |
| 1739 | |
| 1740 // Static Variables | |
| 1741 #ifndef PRODUCT | |
| 1742 uint Scheduling::_total_nop_size = 0; | |
| 1743 uint Scheduling::_total_method_size = 0; | |
| 1744 uint Scheduling::_total_branches = 0; | |
| 1745 uint Scheduling::_total_unconditional_delays = 0; | |
| 1746 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1]; | |
| 1747 #endif | |
| 1748 | |
| 1749 // Initializer for class Scheduling | |
| 1750 | |
| 1751 Scheduling::Scheduling(Arena *arena, Compile &compile) | |
| 1752 : _arena(arena), | |
| 1753 _cfg(compile.cfg()), | |
| 1754 _regalloc(compile.regalloc()), | |
| 1755 _reg_node(arena), | |
| 1756 _bundle_instr_count(0), | |
| 1757 _bundle_cycle_number(0), | |
| 1758 _scheduled(arena), | |
| 1759 _available(arena), | |
| 1760 _next_node(NULL), | |
| 1761 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0]), | |
| 1762 _pinch_free_list(arena) | |
| 1763 #ifndef PRODUCT | |
| 1764 , _branches(0) | |
| 1765 , _unconditional_delays(0) | |
| 1766 #endif | |
| 1767 { | |
| 1768 // Create a MachNopNode | |
| 1769 _nop = new (&compile) MachNopNode(); | |
| 1770 | |
| 1771 // Now that the nops are in the array, save the count | |
| 1772 // (but allow entries for the nops) | |
| 1773 _node_bundling_limit = compile.unique(); | |
| 1774 uint node_max = _regalloc->node_regs_max_index(); | |
| 1775 | |
| 1776 compile.set_node_bundling_limit(_node_bundling_limit); | |
| 1777 | |
| 605 | 1778 // This one is persistent within the Compile class |
| 0 | 1779 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max); |
| 1780 | |
| 1781 // Allocate space for fixed-size arrays | |
| 1782 _node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
| 1783 _uses = NEW_ARENA_ARRAY(arena, short, node_max); | |
| 1784 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
| 1785 | |
| 1786 // Clear the arrays | |
| 1787 memset(_node_bundling_base, 0, node_max * sizeof(Bundle)); | |
| 1788 memset(_node_latency, 0, node_max * sizeof(unsigned short)); | |
| 1789 memset(_uses, 0, node_max * sizeof(short)); | |
| 1790 memset(_current_latency, 0, node_max * sizeof(unsigned short)); | |
| 1791 | |
| 1792 // Clear the bundling information | |
|
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1793 memcpy(_bundle_use_elements, Pipeline_Use::elaborated_elements, sizeof(Pipeline_Use::elaborated_elements)); |
| 0 | 1794 |
| 1795 // Get the last node | |
|
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1796 Block* block = _cfg->get_block(_cfg->number_of_blocks() - 1); |
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1797 |
|
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1798 _next_node = block->get_node(block->number_of_nodes() - 1); |
| 0 | 1799 } |
| 1800 | |
| 1801 #ifndef PRODUCT | |
| 1802 // Scheduling destructor | |
| 1803 Scheduling::~Scheduling() { | |
| 1804 _total_branches += _branches; | |
| 1805 _total_unconditional_delays += _unconditional_delays; | |
| 1806 } | |
| 1807 #endif | |
| 1808 | |
| 1809 // Step ahead "i" cycles | |
| 1810 void Scheduling::step(uint i) { | |
| 1811 | |
| 1812 Bundle *bundle = node_bundling(_next_node); | |
| 1813 bundle->set_starts_bundle(); | |
| 1814 | |
| 1815 // Update the bundle record, but leave the flags information alone | |
| 1816 if (_bundle_instr_count > 0) { | |
| 1817 bundle->set_instr_count(_bundle_instr_count); | |
| 1818 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
| 1819 } | |
| 1820 | |
| 1821 // Update the state information | |
| 1822 _bundle_instr_count = 0; | |
| 1823 _bundle_cycle_number += i; | |
| 1824 _bundle_use.step(i); | |
| 1825 } | |
| 1826 | |
| 1827 void Scheduling::step_and_clear() { | |
| 1828 Bundle *bundle = node_bundling(_next_node); | |
| 1829 bundle->set_starts_bundle(); | |
| 1830 | |
| 1831 // Update the bundle record | |
| 1832 if (_bundle_instr_count > 0) { | |
| 1833 bundle->set_instr_count(_bundle_instr_count); | |
| 1834 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
| 1835 | |
| 1836 _bundle_cycle_number += 1; | |
| 1837 } | |
| 1838 | |
| 1839 // Clear the bundling information | |
| 1840 _bundle_instr_count = 0; | |
| 1841 _bundle_use.reset(); | |
| 1842 | |
| 1843 memcpy(_bundle_use_elements, | |
| 1844 Pipeline_Use::elaborated_elements, | |
| 1845 sizeof(Pipeline_Use::elaborated_elements)); | |
| 1846 } | |
| 1847 | |
| 1848 // Perform instruction scheduling and bundling over the sequence of | |
| 1849 // instructions in backwards order. | |
| 1850 void Compile::ScheduleAndBundle() { | |
| 1851 | |
| 1852 // Don't optimize this if it isn't a method | |
| 1853 if (!_method) | |
| 1854 return; | |
| 1855 | |
| 1856 // Don't optimize this if scheduling is disabled | |
| 1857 if (!do_scheduling()) | |
| 1858 return; | |
| 1859 | |
|
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1860 // Scheduling code works only with pairs (8 bytes) maximum. |
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1861 if (max_vector_size() > 8) |
|
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1862 return; |
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1863 |
| 0 | 1864 NOT_PRODUCT( TracePhase t2("isched", &_t_instrSched, TimeCompiler); ) |
| 1865 | |
| 1866 // Create a data structure for all the scheduling information | |
| 1867 Scheduling scheduling(Thread::current()->resource_area(), *this); | |
| 1868 | |
| 1869 // Walk backwards over each basic block, computing the needed alignment | |
| 1870 // Walk over all the basic blocks | |
| 1871 scheduling.DoScheduling(); | |
| 1872 } | |
| 1873 | |
| 1874 // Compute the latency of all the instructions. This is fairly simple, | |
| 1875 // because we already have a legal ordering. Walk over the instructions | |
| 1876 // from first to last, and compute the latency of the instruction based | |
| 605 | 1877 // on the latency of the preceding instruction(s). |
| 0 | 1878 void Scheduling::ComputeLocalLatenciesForward(const Block *bb) { |
| 1879 #ifndef PRODUCT | |
| 1880 if (_cfg->C->trace_opto_output()) | |
| 1881 tty->print("# -> ComputeLocalLatenciesForward\n"); | |
| 1882 #endif | |
| 1883 | |
| 1884 // Walk over all the schedulable instructions | |
| 1885 for( uint j=_bb_start; j < _bb_end; j++ ) { | |
| 1886 | |
| 1887 // This is a kludge, forcing all latency calculations to start at 1. | |
| 1888 // Used to allow latency 0 to force an instruction to the beginning | |
| 1889 // of the bb | |
| 1890 uint latency = 1; | |
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1891 Node *use = bb->get_node(j); |
| 0 | 1892 uint nlen = use->len(); |
| 1893 | |
| 1894 // Walk over all the inputs | |
| 1895 for ( uint k=0; k < nlen; k++ ) { | |
| 1896 Node *def = use->in(k); | |
| 1897 if (!def) | |
| 1898 continue; | |
| 1899 | |
| 1900 uint l = _node_latency[def->_idx] + use->latency(k); | |
| 1901 if (latency < l) | |
| 1902 latency = l; | |
| 1903 } | |
| 1904 | |
| 1905 _node_latency[use->_idx] = latency; | |
| 1906 | |
| 1907 #ifndef PRODUCT | |
| 1908 if (_cfg->C->trace_opto_output()) { | |
| 1909 tty->print("# latency %4d: ", latency); | |
| 1910 use->dump(); | |
| 1911 } | |
| 1912 #endif | |
| 1913 } | |
| 1914 | |
| 1915 #ifndef PRODUCT | |
| 1916 if (_cfg->C->trace_opto_output()) | |
| 1917 tty->print("# <- ComputeLocalLatenciesForward\n"); | |
| 1918 #endif | |
| 1919 | |
| 1920 } // end ComputeLocalLatenciesForward | |
| 1921 | |
| 1922 // See if this node fits into the present instruction bundle | |
| 1923 bool Scheduling::NodeFitsInBundle(Node *n) { | |
| 1924 uint n_idx = n->_idx; | |
| 1925 | |
| 1926 // If this is the unconditional delay instruction, then it fits | |
| 1927 if (n == _unconditional_delay_slot) { | |
| 1928 #ifndef PRODUCT | |
| 1929 if (_cfg->C->trace_opto_output()) | |
| 1930 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx); | |
| 1931 #endif | |
| 1932 return (true); | |
| 1933 } | |
| 1934 | |
| 1935 // If the node cannot be scheduled this cycle, skip it | |
| 1936 if (_current_latency[n_idx] > _bundle_cycle_number) { | |
| 1937 #ifndef PRODUCT | |
| 1938 if (_cfg->C->trace_opto_output()) | |
| 1939 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n", | |
| 1940 n->_idx, _current_latency[n_idx], _bundle_cycle_number); | |
| 1941 #endif | |
| 1942 return (false); | |
| 1943 } | |
| 1944 | |
| 1945 const Pipeline *node_pipeline = n->pipeline(); | |
| 1946 | |
| 1947 uint instruction_count = node_pipeline->instructionCount(); | |
| 1948 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
| 1949 instruction_count = 0; | |
| 1950 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
| 1951 instruction_count++; | |
| 1952 | |
| 1953 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) { | |
| 1954 #ifndef PRODUCT | |
| 1955 if (_cfg->C->trace_opto_output()) | |
| 1956 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n", | |
| 1957 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle); | |
| 1958 #endif | |
| 1959 return (false); | |
| 1960 } | |
| 1961 | |
| 1962 // Don't allow non-machine nodes to be handled this way | |
| 1963 if (!n->is_Mach() && instruction_count == 0) | |
| 1964 return (false); | |
| 1965 | |
| 1966 // See if there is any overlap | |
| 1967 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse()); | |
| 1968 | |
| 1969 if (delay > 0) { | |
| 1970 #ifndef PRODUCT | |
| 1971 if (_cfg->C->trace_opto_output()) | |
| 1972 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx); | |
| 1973 #endif | |
| 1974 return false; | |
| 1975 } | |
| 1976 | |
| 1977 #ifndef PRODUCT | |
| 1978 if (_cfg->C->trace_opto_output()) | |
| 1979 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx); | |
| 1980 #endif | |
| 1981 | |
| 1982 return true; | |
| 1983 } | |
| 1984 | |
| 1985 Node * Scheduling::ChooseNodeToBundle() { | |
| 1986 uint siz = _available.size(); | |
| 1987 | |
| 1988 if (siz == 0) { | |
| 1989 | |
| 1990 #ifndef PRODUCT | |
| 1991 if (_cfg->C->trace_opto_output()) | |
| 1992 tty->print("# ChooseNodeToBundle: NULL\n"); | |
| 1993 #endif | |
| 1994 return (NULL); | |
| 1995 } | |
| 1996 | |
| 1997 // Fast path, if only 1 instruction in the bundle | |
| 1998 if (siz == 1) { | |
| 1999 #ifndef PRODUCT | |
| 2000 if (_cfg->C->trace_opto_output()) { | |
| 2001 tty->print("# ChooseNodeToBundle (only 1): "); | |
| 2002 _available[0]->dump(); | |
| 2003 } | |
| 2004 #endif | |
| 2005 return (_available[0]); | |
| 2006 } | |
| 2007 | |
| 2008 // Don't bother, if the bundle is already full | |
| 2009 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) { | |
| 2010 for ( uint i = 0; i < siz; i++ ) { | |
| 2011 Node *n = _available[i]; | |
| 2012 | |
| 2013 // Skip projections, we'll handle them another way | |
| 2014 if (n->is_Proj()) | |
| 2015 continue; | |
| 2016 | |
| 2017 // This presupposed that instructions are inserted into the | |
| 2018 // available list in a legality order; i.e. instructions that | |
| 2019 // must be inserted first are at the head of the list | |
| 2020 if (NodeFitsInBundle(n)) { | |
| 2021 #ifndef PRODUCT | |
| 2022 if (_cfg->C->trace_opto_output()) { | |
| 2023 tty->print("# ChooseNodeToBundle: "); | |
| 2024 n->dump(); | |
| 2025 } | |
| 2026 #endif | |
| 2027 return (n); | |
| 2028 } | |
| 2029 } | |
| 2030 } | |
| 2031 | |
| 2032 // Nothing fits in this bundle, choose the highest priority | |
| 2033 #ifndef PRODUCT | |
| 2034 if (_cfg->C->trace_opto_output()) { | |
| 2035 tty->print("# ChooseNodeToBundle: "); | |
| 2036 _available[0]->dump(); | |
| 2037 } | |
| 2038 #endif | |
| 2039 | |
| 2040 return _available[0]; | |
| 2041 } | |
| 2042 | |
| 2043 void Scheduling::AddNodeToAvailableList(Node *n) { | |
| 2044 assert( !n->is_Proj(), "projections never directly made available" ); | |
| 2045 #ifndef PRODUCT | |
| 2046 if (_cfg->C->trace_opto_output()) { | |
| 2047 tty->print("# AddNodeToAvailableList: "); | |
| 2048 n->dump(); | |
| 2049 } | |
| 2050 #endif | |
| 2051 | |
| 2052 int latency = _current_latency[n->_idx]; | |
| 2053 | |
| 2054 // Insert in latency order (insertion sort) | |
| 2055 uint i; | |
| 2056 for ( i=0; i < _available.size(); i++ ) | |
| 2057 if (_current_latency[_available[i]->_idx] > latency) | |
| 2058 break; | |
| 2059 | |
| 2060 // Special Check for compares following branches | |
| 2061 if( n->is_Mach() && _scheduled.size() > 0 ) { | |
| 2062 int op = n->as_Mach()->ideal_Opcode(); | |
| 2063 Node *last = _scheduled[0]; | |
| 2064 if( last->is_MachIf() && last->in(1) == n && | |
| 2065 ( op == Op_CmpI || | |
| 2066 op == Op_CmpU || | |
| 2067 op == Op_CmpP || | |
| 2068 op == Op_CmpF || | |
| 2069 op == Op_CmpD || | |
| 2070 op == Op_CmpL ) ) { | |
| 2071 | |
| 2072 // Recalculate position, moving to front of same latency | |
| 2073 for ( i=0 ; i < _available.size(); i++ ) | |
| 2074 if (_current_latency[_available[i]->_idx] >= latency) | |
| 2075 break; | |
| 2076 } | |
| 2077 } | |
| 2078 | |
| 2079 // Insert the node in the available list | |
| 2080 _available.insert(i, n); | |
| 2081 | |
| 2082 #ifndef PRODUCT | |
| 2083 if (_cfg->C->trace_opto_output()) | |
| 2084 dump_available(); | |
| 2085 #endif | |
| 2086 } | |
| 2087 | |
| 2088 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) { | |
| 2089 for ( uint i=0; i < n->len(); i++ ) { | |
| 2090 Node *def = n->in(i); | |
| 2091 if (!def) continue; | |
| 2092 if( def->is_Proj() ) // If this is a machine projection, then | |
| 2093 def = def->in(0); // propagate usage thru to the base instruction | |
| 2094 | |
|
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2095 if(_cfg->get_block_for_node(def) != bb) { // Ignore if not block-local |
| 0 | 2096 continue; |
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2097 } |
| 0 | 2098 |
| 2099 // Compute the latency | |
| 2100 uint l = _bundle_cycle_number + n->latency(i); | |
| 2101 if (_current_latency[def->_idx] < l) | |
| 2102 _current_latency[def->_idx] = l; | |
| 2103 | |
| 2104 // If this does not have uses then schedule it | |
| 2105 if ((--_uses[def->_idx]) == 0) | |
| 2106 AddNodeToAvailableList(def); | |
| 2107 } | |
| 2108 } | |
| 2109 | |
| 2110 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) { | |
| 2111 #ifndef PRODUCT | |
| 2112 if (_cfg->C->trace_opto_output()) { | |
| 2113 tty->print("# AddNodeToBundle: "); | |
| 2114 n->dump(); | |
| 2115 } | |
| 2116 #endif | |
| 2117 | |
| 2118 // Remove this from the available list | |
| 2119 uint i; | |
| 2120 for (i = 0; i < _available.size(); i++) | |
| 2121 if (_available[i] == n) | |
| 2122 break; | |
| 2123 assert(i < _available.size(), "entry in _available list not found"); | |
| 2124 _available.remove(i); | |
| 2125 | |
| 2126 // See if this fits in the current bundle | |
| 2127 const Pipeline *node_pipeline = n->pipeline(); | |
| 2128 const Pipeline_Use& node_usage = node_pipeline->resourceUse(); | |
| 2129 | |
| 2130 // Check for instructions to be placed in the delay slot. We | |
| 2131 // do this before we actually schedule the current instruction, | |
| 2132 // because the delay slot follows the current instruction. | |
| 2133 if (Pipeline::_branch_has_delay_slot && | |
| 2134 node_pipeline->hasBranchDelay() && | |
| 2135 !_unconditional_delay_slot) { | |
| 2136 | |
| 2137 uint siz = _available.size(); | |
| 2138 | |
| 2139 // Conditional branches can support an instruction that | |
| 605 | 2140 // is unconditionally executed and not dependent by the |
| 0 | 2141 // branch, OR a conditionally executed instruction if |
| 2142 // the branch is taken. In practice, this means that | |
| 2143 // the first instruction at the branch target is | |
| 2144 // copied to the delay slot, and the branch goes to | |
| 2145 // the instruction after that at the branch target | |
|
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2146 if ( n->is_MachBranch() ) { |
| 0 | 2147 |
| 2148 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" ); | |
| 2149 assert( !n->is_Catch(), "should not look for delay slot for Catch" ); | |
| 2150 | |
| 2151 #ifndef PRODUCT | |
| 2152 _branches++; | |
| 2153 #endif | |
| 2154 | |
| 2155 // At least 1 instruction is on the available list | |
| 605 | 2156 // that is not dependent on the branch |
| 0 | 2157 for (uint i = 0; i < siz; i++) { |
| 2158 Node *d = _available[i]; | |
| 2159 const Pipeline *avail_pipeline = d->pipeline(); | |
| 2160 | |
| 2161 // Don't allow safepoints in the branch shadow, that will | |
| 2162 // cause a number of difficulties | |
| 2163 if ( avail_pipeline->instructionCount() == 1 && | |
| 2164 !avail_pipeline->hasMultipleBundles() && | |
| 2165 !avail_pipeline->hasBranchDelay() && | |
| 2166 Pipeline::instr_has_unit_size() && | |
| 2167 d->size(_regalloc) == Pipeline::instr_unit_size() && | |
| 2168 NodeFitsInBundle(d) && | |
| 2169 !node_bundling(d)->used_in_delay()) { | |
| 2170 | |
| 2171 if (d->is_Mach() && !d->is_MachSafePoint()) { | |
| 2172 // A node that fits in the delay slot was found, so we need to | |
| 2173 // set the appropriate bits in the bundle pipeline information so | |
| 2174 // that it correctly indicates resource usage. Later, when we | |
| 2175 // attempt to add this instruction to the bundle, we will skip | |
| 2176 // setting the resource usage. | |
| 2177 _unconditional_delay_slot = d; | |
| 2178 node_bundling(n)->set_use_unconditional_delay(); | |
| 2179 node_bundling(d)->set_used_in_unconditional_delay(); | |
| 2180 _bundle_use.add_usage(avail_pipeline->resourceUse()); | |
| 2181 _current_latency[d->_idx] = _bundle_cycle_number; | |
| 2182 _next_node = d; | |
| 2183 ++_bundle_instr_count; | |
| 2184 #ifndef PRODUCT | |
| 2185 _unconditional_delays++; | |
| 2186 #endif | |
| 2187 break; | |
| 2188 } | |
| 2189 } | |
| 2190 } | |
| 2191 } | |
| 2192 | |
| 2193 // No delay slot, add a nop to the usage | |
| 2194 if (!_unconditional_delay_slot) { | |
| 2195 // See if adding an instruction in the delay slot will overflow | |
| 2196 // the bundle. | |
| 2197 if (!NodeFitsInBundle(_nop)) { | |
| 2198 #ifndef PRODUCT | |
| 2199 if (_cfg->C->trace_opto_output()) | |
| 2200 tty->print("# *** STEP(1 instruction for delay slot) ***\n"); | |
| 2201 #endif | |
| 2202 step(1); | |
| 2203 } | |
| 2204 | |
| 2205 _bundle_use.add_usage(_nop->pipeline()->resourceUse()); | |
| 2206 _next_node = _nop; | |
| 2207 ++_bundle_instr_count; | |
| 2208 } | |
| 2209 | |
| 2210 // See if the instruction in the delay slot requires a | |
| 2211 // step of the bundles | |
| 2212 if (!NodeFitsInBundle(n)) { | |
| 2213 #ifndef PRODUCT | |
| 2214 if (_cfg->C->trace_opto_output()) | |
| 2215 tty->print("# *** STEP(branch won't fit) ***\n"); | |
| 2216 #endif | |
| 2217 // Update the state information | |
| 2218 _bundle_instr_count = 0; | |
| 2219 _bundle_cycle_number += 1; | |
| 2220 _bundle_use.step(1); | |
| 2221 } | |
| 2222 } | |
| 2223 | |
| 2224 // Get the number of instructions | |
| 2225 uint instruction_count = node_pipeline->instructionCount(); | |
| 2226 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
| 2227 instruction_count = 0; | |
| 2228 | |
| 2229 // Compute the latency information | |
| 2230 uint delay = 0; | |
| 2231 | |
| 2232 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) { | |
| 2233 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number; | |
| 2234 if (relative_latency < 0) | |
| 2235 relative_latency = 0; | |
| 2236 | |
| 2237 delay = _bundle_use.full_latency(relative_latency, node_usage); | |
| 2238 | |
| 2239 // Does not fit in this bundle, start a new one | |
| 2240 if (delay > 0) { | |
| 2241 step(delay); | |
| 2242 | |
| 2243 #ifndef PRODUCT | |
| 2244 if (_cfg->C->trace_opto_output()) | |
| 2245 tty->print("# *** STEP(%d) ***\n", delay); | |
| 2246 #endif | |
| 2247 } | |
| 2248 } | |
| 2249 | |
| 2250 // If this was placed in the delay slot, ignore it | |
| 2251 if (n != _unconditional_delay_slot) { | |
| 2252 | |
| 2253 if (delay == 0) { | |
| 2254 if (node_pipeline->hasMultipleBundles()) { | |
| 2255 #ifndef PRODUCT | |
| 2256 if (_cfg->C->trace_opto_output()) | |
| 2257 tty->print("# *** STEP(multiple instructions) ***\n"); | |
| 2258 #endif | |
| 2259 step(1); | |
| 2260 } | |
| 2261 | |
| 2262 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) { | |
| 2263 #ifndef PRODUCT | |
| 2264 if (_cfg->C->trace_opto_output()) | |
| 2265 tty->print("# *** STEP(%d >= %d instructions) ***\n", | |
| 2266 instruction_count + _bundle_instr_count, | |
| 2267 Pipeline::_max_instrs_per_cycle); | |
| 2268 #endif | |
| 2269 step(1); | |
| 2270 } | |
| 2271 } | |
| 2272 | |
| 2273 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
| 2274 _bundle_instr_count++; | |
| 2275 | |
| 2276 // Set the node's latency | |
| 2277 _current_latency[n->_idx] = _bundle_cycle_number; | |
| 2278 | |
| 2279 // Now merge the functional unit information | |
| 2280 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) | |
| 2281 _bundle_use.add_usage(node_usage); | |
| 2282 | |
| 2283 // Increment the number of instructions in this bundle | |
| 2284 _bundle_instr_count += instruction_count; | |
| 2285 | |
| 2286 // Remember this node for later | |
| 2287 if (n->is_Mach()) | |
| 2288 _next_node = n; | |
| 2289 } | |
| 2290 | |
| 2291 // It's possible to have a BoxLock in the graph and in the _bbs mapping but | |
| 2292 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks. | |
| 2293 // 'Schedule' them (basically ignore in the schedule) but do not insert them | |
| 2294 // into the block. All other scheduled nodes get put in the schedule here. | |
| 2295 int op = n->Opcode(); | |
| 2296 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR | |
| 2297 (op != Op_Node && // Not an unused antidepedence node and | |
| 2298 // not an unallocated boxlock | |
| 2299 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) { | |
| 2300 | |
| 2301 // Push any trailing projections | |
|
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2302 if( bb->get_node(bb->number_of_nodes()-1) != n ) { |
| 0 | 2303 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
| 2304 Node *foi = n->fast_out(i); | |
| 2305 if( foi->is_Proj() ) | |
| 2306 _scheduled.push(foi); | |
| 2307 } | |
| 2308 } | |
| 2309 | |
| 2310 // Put the instruction in the schedule list | |
| 2311 _scheduled.push(n); | |
| 2312 } | |
| 2313 | |
| 2314 #ifndef PRODUCT | |
| 2315 if (_cfg->C->trace_opto_output()) | |
| 2316 dump_available(); | |
| 2317 #endif | |
| 2318 | |
| 2319 // Walk all the definitions, decrementing use counts, and | |
| 2320 // if a definition has a 0 use count, place it in the available list. | |
| 2321 DecrementUseCounts(n,bb); | |
| 2322 } | |
| 2323 | |
| 2324 // This method sets the use count within a basic block. We will ignore all | |
| 2325 // uses outside the current basic block. As we are doing a backwards walk, | |
| 2326 // any node we reach that has a use count of 0 may be scheduled. This also | |
| 2327 // avoids the problem of cyclic references from phi nodes, as long as phi | |
| 2328 // nodes are at the front of the basic block. This method also initializes | |
| 2329 // the available list to the set of instructions that have no uses within this | |
| 2330 // basic block. | |
| 2331 void Scheduling::ComputeUseCount(const Block *bb) { | |
| 2332 #ifndef PRODUCT | |
| 2333 if (_cfg->C->trace_opto_output()) | |
| 2334 tty->print("# -> ComputeUseCount\n"); | |
| 2335 #endif | |
| 2336 | |
| 2337 // Clear the list of available and scheduled instructions, just in case | |
| 2338 _available.clear(); | |
| 2339 _scheduled.clear(); | |
| 2340 | |
| 2341 // No delay slot specified | |
| 2342 _unconditional_delay_slot = NULL; | |
| 2343 | |
| 2344 #ifdef ASSERT | |
|
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2345 for( uint i=0; i < bb->number_of_nodes(); i++ ) |
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2346 assert( _uses[bb->get_node(i)->_idx] == 0, "_use array not clean" ); |
| 0 | 2347 #endif |
| 2348 | |
| 2349 // Force the _uses count to never go to zero for unscheduable pieces | |
| 2350 // of the block | |
| 2351 for( uint k = 0; k < _bb_start; k++ ) | |
|
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2352 _uses[bb->get_node(k)->_idx] = 1; |
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2353 for( uint l = _bb_end; l < bb->number_of_nodes(); l++ ) |
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2354 _uses[bb->get_node(l)->_idx] = 1; |
| 0 | 2355 |
| 2356 // Iterate backwards over the instructions in the block. Don't count the | |
| 2357 // branch projections at end or the block header instructions. | |
| 2358 for( uint j = _bb_end-1; j >= _bb_start; j-- ) { | |
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2359 Node *n = bb->get_node(j); |
| 0 | 2360 if( n->is_Proj() ) continue; // Projections handled another way |
| 2361 | |
| 2362 // Account for all uses | |
| 2363 for ( uint k = 0; k < n->len(); k++ ) { | |
| 2364 Node *inp = n->in(k); | |
| 2365 if (!inp) continue; | |
| 2366 assert(inp != n, "no cycles allowed" ); | |
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2367 if (_cfg->get_block_for_node(inp) == bb) { // Block-local use? |
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2368 if (inp->is_Proj()) { // Skip through Proj's |
| 0 | 2369 inp = inp->in(0); |
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2370 } |
| 0 | 2371 ++_uses[inp->_idx]; // Count 1 block-local use |
| 2372 } | |
| 2373 } | |
| 2374 | |
| 2375 // If this instruction has a 0 use count, then it is available | |
| 2376 if (!_uses[n->_idx]) { | |
| 2377 _current_latency[n->_idx] = _bundle_cycle_number; | |
| 2378 AddNodeToAvailableList(n); | |
| 2379 } | |
| 2380 | |
| 2381 #ifndef PRODUCT | |
| 2382 if (_cfg->C->trace_opto_output()) { | |
| 2383 tty->print("# uses: %3d: ", _uses[n->_idx]); | |
| 2384 n->dump(); | |
| 2385 } | |
| 2386 #endif | |
| 2387 } | |
| 2388 | |
| 2389 #ifndef PRODUCT | |
| 2390 if (_cfg->C->trace_opto_output()) | |
| 2391 tty->print("# <- ComputeUseCount\n"); | |
| 2392 #endif | |
| 2393 } | |
| 2394 | |
| 2395 // This routine performs scheduling on each basic block in reverse order, | |
| 2396 // using instruction latencies and taking into account function unit | |
| 2397 // availability. | |
| 2398 void Scheduling::DoScheduling() { | |
| 2399 #ifndef PRODUCT | |
| 2400 if (_cfg->C->trace_opto_output()) | |
| 2401 tty->print("# -> DoScheduling\n"); | |
| 2402 #endif | |
| 2403 | |
| 2404 Block *succ_bb = NULL; | |
| 2405 Block *bb; | |
| 2406 | |
| 2407 // Walk over all the basic blocks in reverse order | |
|
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2408 for (int i = _cfg->number_of_blocks() - 1; i >= 0; succ_bb = bb, i--) { |
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2409 bb = _cfg->get_block(i); |
| 0 | 2410 |
| 2411 #ifndef PRODUCT | |
| 2412 if (_cfg->C->trace_opto_output()) { | |
| 2413 tty->print("# Schedule BB#%03d (initial)\n", i); | |
|
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2414 for (uint j = 0; j < bb->number_of_nodes(); j++) { |
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2415 bb->get_node(j)->dump(); |
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2416 } |
| 0 | 2417 } |
| 2418 #endif | |
| 2419 | |
| 2420 // On the head node, skip processing | |
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2421 if (bb == _cfg->get_root_block()) { |
| 0 | 2422 continue; |
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2423 } |
| 0 | 2424 |
| 2425 // Skip empty, connector blocks | |
| 2426 if (bb->is_connector()) | |
| 2427 continue; | |
| 2428 | |
| 2429 // If the following block is not the sole successor of | |
| 2430 // this one, then reset the pipeline information | |
| 2431 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) { | |
| 2432 #ifndef PRODUCT | |
| 2433 if (_cfg->C->trace_opto_output()) { | |
| 2434 tty->print("*** bundle start of next BB, node %d, for %d instructions\n", | |
| 2435 _next_node->_idx, _bundle_instr_count); | |
| 2436 } | |
| 2437 #endif | |
| 2438 step_and_clear(); | |
| 2439 } | |
| 2440 | |
| 2441 // Leave untouched the starting instruction, any Phis, a CreateEx node | |
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2442 // or Top. bb->get_node(_bb_start) is the first schedulable instruction. |
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2443 _bb_end = bb->number_of_nodes()-1; |
| 0 | 2444 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) { |
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2445 Node *n = bb->get_node(_bb_start); |
| 0 | 2446 // Things not matched, like Phinodes and ProjNodes don't get scheduled. |
| 2447 // Also, MachIdealNodes do not get scheduled | |
| 2448 if( !n->is_Mach() ) continue; // Skip non-machine nodes | |
| 2449 MachNode *mach = n->as_Mach(); | |
| 2450 int iop = mach->ideal_Opcode(); | |
| 2451 if( iop == Op_CreateEx ) continue; // CreateEx is pinned | |
| 2452 if( iop == Op_Con ) continue; // Do not schedule Top | |
| 2453 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes | |
| 2454 mach->pipeline() == MachNode::pipeline_class() && | |
| 2455 !n->is_SpillCopy() ) // Breakpoints, Prolog, etc | |
| 2456 continue; | |
| 2457 break; // Funny loop structure to be sure... | |
| 2458 } | |
| 2459 // Compute last "interesting" instruction in block - last instruction we | |
| 2460 // might schedule. _bb_end points just after last schedulable inst. We | |
| 2461 // normally schedule conditional branches (despite them being forced last | |
| 2462 // in the block), because they have delay slots we can fill. Calls all | |
| 2463 // have their delay slots filled in the template expansions, so we don't | |
| 2464 // bother scheduling them. | |
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2465 Node *last = bb->get_node(_bb_end); |
| 3851 | 2466 // Ignore trailing NOPs. |
| 2467 while (_bb_end > 0 && last->is_Mach() && | |
| 2468 last->as_Mach()->ideal_Opcode() == Op_Con) { | |
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2469 last = bb->get_node(--_bb_end); |
| 3851 | 2470 } |
| 2471 assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, ""); | |
| 0 | 2472 if( last->is_Catch() || |
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2473 // Exclude unreachable path case when Halt node is in a separate block. |
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2474 (_bb_end > 1 && last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) { |
| 0 | 2475 // There must be a prior call. Skip it. |
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2476 while( !bb->get_node(--_bb_end)->is_MachCall() ) { |
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2477 assert( bb->get_node(_bb_end)->is_MachProj(), "skipping projections after expected call" ); |
| 0 | 2478 } |
| 2479 } else if( last->is_MachNullCheck() ) { | |
| 2480 // Backup so the last null-checked memory instruction is | |
| 2481 // outside the schedulable range. Skip over the nullcheck, | |
| 2482 // projection, and the memory nodes. | |
| 2483 Node *mem = last->in(1); | |
| 2484 do { | |
| 2485 _bb_end--; | |
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2486 } while (mem != bb->get_node(_bb_end)); |
| 0 | 2487 } else { |
| 2488 // Set _bb_end to point after last schedulable inst. | |
| 2489 _bb_end++; | |
| 2490 } | |
| 2491 | |
| 2492 assert( _bb_start <= _bb_end, "inverted block ends" ); | |
| 2493 | |
| 2494 // Compute the register antidependencies for the basic block | |
| 2495 ComputeRegisterAntidependencies(bb); | |
| 2496 if (_cfg->C->failing()) return; // too many D-U pinch points | |
| 2497 | |
| 2498 // Compute intra-bb latencies for the nodes | |
| 2499 ComputeLocalLatenciesForward(bb); | |
| 2500 | |
| 2501 // Compute the usage within the block, and set the list of all nodes | |
| 2502 // in the block that have no uses within the block. | |
| 2503 ComputeUseCount(bb); | |
| 2504 | |
| 2505 // Schedule the remaining instructions in the block | |
| 2506 while ( _available.size() > 0 ) { | |
| 2507 Node *n = ChooseNodeToBundle(); | |
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2508 guarantee(n != NULL, "no nodes available"); |
| 0 | 2509 AddNodeToBundle(n,bb); |
| 2510 } | |
| 2511 | |
| 2512 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" ); | |
| 2513 #ifdef ASSERT | |
| 2514 for( uint l = _bb_start; l < _bb_end; l++ ) { | |
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2515 Node *n = bb->get_node(l); |
| 0 | 2516 uint m; |
| 2517 for( m = 0; m < _bb_end-_bb_start; m++ ) | |
| 2518 if( _scheduled[m] == n ) | |
| 2519 break; | |
| 2520 assert( m < _bb_end-_bb_start, "instruction missing in schedule" ); | |
| 2521 } | |
| 2522 #endif | |
| 2523 | |
| 2524 // Now copy the instructions (in reverse order) back to the block | |
| 2525 for ( uint k = _bb_start; k < _bb_end; k++ ) | |
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2526 bb->map_node(_scheduled[_bb_end-k-1], k); |
| 0 | 2527 |
| 2528 #ifndef PRODUCT | |
| 2529 if (_cfg->C->trace_opto_output()) { | |
| 2530 tty->print("# Schedule BB#%03d (final)\n", i); | |
| 2531 uint current = 0; | |
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2532 for (uint j = 0; j < bb->number_of_nodes(); j++) { |
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2533 Node *n = bb->get_node(j); |
| 0 | 2534 if( valid_bundle_info(n) ) { |
| 2535 Bundle *bundle = node_bundling(n); | |
| 2536 if (bundle->instr_count() > 0 || bundle->flags() > 0) { | |
| 2537 tty->print("*** Bundle: "); | |
| 2538 bundle->dump(); | |
| 2539 } | |
| 2540 n->dump(); | |
| 2541 } | |
| 2542 } | |
| 2543 } | |
| 2544 #endif | |
| 2545 #ifdef ASSERT | |
| 2546 verify_good_schedule(bb,"after block local scheduling"); | |
| 2547 #endif | |
| 2548 } | |
| 2549 | |
| 2550 #ifndef PRODUCT | |
| 2551 if (_cfg->C->trace_opto_output()) | |
| 2552 tty->print("# <- DoScheduling\n"); | |
| 2553 #endif | |
| 2554 | |
| 2555 // Record final node-bundling array location | |
| 2556 _regalloc->C->set_node_bundling_base(_node_bundling_base); | |
| 2557 | |
| 2558 } // end DoScheduling | |
| 2559 | |
| 2560 // Verify that no live-range used in the block is killed in the block by a | |
| 2561 // wrong DEF. This doesn't verify live-ranges that span blocks. | |
| 2562 | |
| 2563 // Check for edge existence. Used to avoid adding redundant precedence edges. | |
| 2564 static bool edge_from_to( Node *from, Node *to ) { | |
| 2565 for( uint i=0; i<from->len(); i++ ) | |
| 2566 if( from->in(i) == to ) | |
| 2567 return true; | |
| 2568 return false; | |
| 2569 } | |
| 2570 | |
| 2571 #ifdef ASSERT | |
| 2572 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) { | |
| 2573 // Check for bad kills | |
| 2574 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow | |
| 2575 Node *prior_use = _reg_node[def]; | |
| 2576 if( prior_use && !edge_from_to(prior_use,n) ) { | |
| 2577 tty->print("%s = ",OptoReg::as_VMReg(def)->name()); | |
| 2578 n->dump(); | |
| 2579 tty->print_cr("..."); | |
| 2580 prior_use->dump(); | |
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2581 assert(edge_from_to(prior_use,n),msg); |
| 0 | 2582 } |
| 2583 _reg_node.map(def,NULL); // Kill live USEs | |
| 2584 } | |
| 2585 } | |
| 2586 | |
| 2587 void Scheduling::verify_good_schedule( Block *b, const char *msg ) { | |
| 2588 | |
| 2589 // Zap to something reasonable for the verify code | |
| 2590 _reg_node.clear(); | |
| 2591 | |
| 2592 // Walk over the block backwards. Check to make sure each DEF doesn't | |
| 2593 // kill a live value (other than the one it's supposed to). Add each | |
| 2594 // USE to the live set. | |
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2595 for( uint i = b->number_of_nodes()-1; i >= _bb_start; i-- ) { |
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2596 Node *n = b->get_node(i); |
| 0 | 2597 int n_op = n->Opcode(); |
| 2598 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
| 2599 // Fat-proj kills a slew of registers | |
| 2600 RegMask rm = n->out_RegMask();// Make local copy | |
| 2601 while( rm.is_NotEmpty() ) { | |
| 2602 OptoReg::Name kill = rm.find_first_elem(); | |
| 2603 rm.Remove(kill); | |
| 2604 verify_do_def( n, kill, msg ); | |
| 2605 } | |
| 2606 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes | |
| 2607 // Get DEF'd registers the normal way | |
| 2608 verify_do_def( n, _regalloc->get_reg_first(n), msg ); | |
| 2609 verify_do_def( n, _regalloc->get_reg_second(n), msg ); | |
| 2610 } | |
| 2611 | |
| 2612 // Now make all USEs live | |
| 2613 for( uint i=1; i<n->req(); i++ ) { | |
| 2614 Node *def = n->in(i); | |
| 2615 assert(def != 0, "input edge required"); | |
| 2616 OptoReg::Name reg_lo = _regalloc->get_reg_first(def); | |
| 2617 OptoReg::Name reg_hi = _regalloc->get_reg_second(def); | |
| 2618 if( OptoReg::is_valid(reg_lo) ) { | |
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2619 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), msg); |
| 0 | 2620 _reg_node.map(reg_lo,n); |
| 2621 } | |
| 2622 if( OptoReg::is_valid(reg_hi) ) { | |
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2623 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), msg); |
| 0 | 2624 _reg_node.map(reg_hi,n); |
| 2625 } | |
| 2626 } | |
| 2627 | |
| 2628 } | |
| 2629 | |
| 2630 // Zap to something reasonable for the Antidependence code | |
| 2631 _reg_node.clear(); | |
| 2632 } | |
| 2633 #endif | |
| 2634 | |
| 2635 // Conditionally add precedence edges. Avoid putting edges on Projs. | |
| 2636 static void add_prec_edge_from_to( Node *from, Node *to ) { | |
| 2637 if( from->is_Proj() ) { // Put precedence edge on Proj's input | |
| 2638 assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" ); | |
| 2639 from = from->in(0); | |
| 2640 } | |
| 2641 if( from != to && // No cycles (for things like LD L0,[L0+4] ) | |
| 2642 !edge_from_to( from, to ) ) // Avoid duplicate edge | |
| 2643 from->add_prec(to); | |
| 2644 } | |
| 2645 | |
| 2646 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) { | |
| 2647 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow | |
| 2648 return; | |
| 2649 | |
| 2650 Node *pinch = _reg_node[def_reg]; // Get pinch point | |
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2651 if ((pinch == NULL) || _cfg->get_block_for_node(pinch) != b || // No pinch-point yet? |
| 0 | 2652 is_def ) { // Check for a true def (not a kill) |
| 2653 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point | |
| 2654 return; | |
| 2655 } | |
| 2656 | |
| 2657 Node *kill = def; // Rename 'def' to more descriptive 'kill' | |
| 2658 debug_only( def = (Node*)0xdeadbeef; ) | |
| 2659 | |
| 2660 // After some number of kills there _may_ be a later def | |
| 2661 Node *later_def = NULL; | |
| 2662 | |
| 2663 // Finding a kill requires a real pinch-point. | |
| 2664 // Check for not already having a pinch-point. | |
| 2665 // Pinch points are Op_Node's. | |
| 2666 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point? | |
| 2667 later_def = pinch; // Must be def/kill as optimistic pinch-point | |
| 2668 if ( _pinch_free_list.size() > 0) { | |
| 2669 pinch = _pinch_free_list.pop(); | |
| 2670 } else { | |
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2671 pinch = new (_cfg->C) Node(1); // Pinch point to-be |
| 0 | 2672 } |
| 2673 if (pinch->_idx >= _regalloc->node_regs_max_index()) { | |
| 2674 _cfg->C->record_method_not_compilable("too many D-U pinch points"); | |
| 2675 return; | |
| 2676 } | |
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2677 _cfg->map_node_to_block(pinch, b); // Pretend it's valid in this block (lazy init) |
| 0 | 2678 _reg_node.map(def_reg,pinch); // Record pinch-point |
| 2679 //_regalloc->set_bad(pinch->_idx); // Already initialized this way. | |
| 2680 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill | |
| 2681 pinch->init_req(0, _cfg->C->top()); // set not NULL for the next call | |
| 2682 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch | |
| 2683 later_def = NULL; // and no later def | |
| 2684 } | |
| 2685 pinch->set_req(0,later_def); // Hook later def so we can find it | |
| 2686 } else { // Else have valid pinch point | |
| 2687 if( pinch->in(0) ) // If there is a later-def | |
| 2688 later_def = pinch->in(0); // Get it | |
| 2689 } | |
| 2690 | |
| 2691 // Add output-dependence edge from later def to kill | |
| 2692 if( later_def ) // If there is some original def | |
| 2693 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill | |
| 2694 | |
| 2695 // See if current kill is also a use, and so is forced to be the pinch-point. | |
| 2696 if( pinch->Opcode() == Op_Node ) { | |
| 2697 Node *uses = kill->is_Proj() ? kill->in(0) : kill; | |
| 2698 for( uint i=1; i<uses->req(); i++ ) { | |
| 2699 if( _regalloc->get_reg_first(uses->in(i)) == def_reg || | |
| 2700 _regalloc->get_reg_second(uses->in(i)) == def_reg ) { | |
| 2701 // Yes, found a use/kill pinch-point | |
| 2702 pinch->set_req(0,NULL); // | |
| 2703 pinch->replace_by(kill); // Move anti-dep edges up | |
| 2704 pinch = kill; | |
| 2705 _reg_node.map(def_reg,pinch); | |
| 2706 return; | |
| 2707 } | |
| 2708 } | |
| 2709 } | |
| 2710 | |
| 2711 // Add edge from kill to pinch-point | |
| 2712 add_prec_edge_from_to(kill,pinch); | |
| 2713 } | |
| 2714 | |
| 2715 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) { | |
| 2716 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow | |
| 2717 return; | |
| 2718 Node *pinch = _reg_node[use_reg]; // Get pinch point | |
| 2719 // Check for no later def_reg/kill in block | |
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2720 if ((pinch != NULL) && _cfg->get_block_for_node(pinch) == b && |
| 0 | 2721 // Use has to be block-local as well |
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2722 _cfg->get_block_for_node(use) == b) { |
| 0 | 2723 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?) |
| 2724 pinch->req() == 1 ) { // pinch not yet in block? | |
| 2725 pinch->del_req(0); // yank pointer to later-def, also set flag | |
| 2726 // Insert the pinch-point in the block just after the last use | |
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2727 b->insert_node(pinch, b->find_node(use) + 1); |
| 0 | 2728 _bb_end++; // Increase size scheduled region in block |
| 2729 } | |
| 2730 | |
| 2731 add_prec_edge_from_to(pinch,use); | |
| 2732 } | |
| 2733 } | |
| 2734 | |
| 2735 // We insert antidependences between the reads and following write of | |
| 2736 // allocated registers to prevent illegal code motion. Hopefully, the | |
| 2737 // number of added references should be fairly small, especially as we | |
| 2738 // are only adding references within the current basic block. | |
| 2739 void Scheduling::ComputeRegisterAntidependencies(Block *b) { | |
| 2740 | |
| 2741 #ifdef ASSERT | |
| 2742 verify_good_schedule(b,"before block local scheduling"); | |
| 2743 #endif | |
| 2744 | |
| 2745 // A valid schedule, for each register independently, is an endless cycle | |
| 2746 // of: a def, then some uses (connected to the def by true dependencies), | |
| 2747 // then some kills (defs with no uses), finally the cycle repeats with a new | |
| 2748 // def. The uses are allowed to float relative to each other, as are the | |
| 2749 // kills. No use is allowed to slide past a kill (or def). This requires | |
| 2750 // antidependencies between all uses of a single def and all kills that | |
| 2751 // follow, up to the next def. More edges are redundant, because later defs | |
| 2752 // & kills are already serialized with true or antidependencies. To keep | |
| 2753 // the edge count down, we add a 'pinch point' node if there's more than | |
| 2754 // one use or more than one kill/def. | |
| 2755 | |
| 2756 // We add dependencies in one bottom-up pass. | |
| 2757 | |
| 2758 // For each instruction we handle it's DEFs/KILLs, then it's USEs. | |
| 2759 | |
| 2760 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this | |
| 2761 // register. If not, we record the DEF/KILL in _reg_node, the | |
| 2762 // register-to-def mapping. If there is a prior DEF/KILL, we insert a | |
| 2763 // "pinch point", a new Node that's in the graph but not in the block. | |
| 2764 // We put edges from the prior and current DEF/KILLs to the pinch point. | |
| 2765 // We put the pinch point in _reg_node. If there's already a pinch point | |
| 2766 // we merely add an edge from the current DEF/KILL to the pinch point. | |
| 2767 | |
| 2768 // After doing the DEF/KILLs, we handle USEs. For each used register, we | |
| 2769 // put an edge from the pinch point to the USE. | |
| 2770 | |
| 2771 // To be expedient, the _reg_node array is pre-allocated for the whole | |
| 2772 // compilation. _reg_node is lazily initialized; it either contains a NULL, | |
| 2773 // or a valid def/kill/pinch-point, or a leftover node from some prior | |
| 2774 // block. Leftover node from some prior block is treated like a NULL (no | |
| 2775 // prior def, so no anti-dependence needed). Valid def is distinguished by | |
| 2776 // it being in the current block. | |
| 2777 bool fat_proj_seen = false; | |
| 2778 uint last_safept = _bb_end-1; | |
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2779 Node* end_node = (_bb_end-1 >= _bb_start) ? b->get_node(last_safept) : NULL; |
| 0 | 2780 Node* last_safept_node = end_node; |
| 2781 for( uint i = _bb_end-1; i >= _bb_start; i-- ) { | |
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2782 Node *n = b->get_node(i); |
| 0 | 2783 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges |
| 3842 | 2784 if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) { |
| 0 | 2785 // Fat-proj kills a slew of registers |
| 2786 // This can add edges to 'n' and obscure whether or not it was a def, | |
| 2787 // hence the is_def flag. | |
| 2788 fat_proj_seen = true; | |
| 2789 RegMask rm = n->out_RegMask();// Make local copy | |
| 2790 while( rm.is_NotEmpty() ) { | |
| 2791 OptoReg::Name kill = rm.find_first_elem(); | |
| 2792 rm.Remove(kill); | |
| 2793 anti_do_def( b, n, kill, is_def ); | |
| 2794 } | |
| 2795 } else { | |
| 2796 // Get DEF'd registers the normal way | |
| 2797 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def ); | |
| 2798 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def ); | |
| 2799 } | |
| 2800 | |
| 3851 | 2801 // Kill projections on a branch should appear to occur on the |
| 2802 // branch, not afterwards, so grab the masks from the projections | |
| 2803 // and process them. | |
|
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2804 if (n->is_MachBranch() || n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump) { |
| 3851 | 2805 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
| 2806 Node* use = n->fast_out(i); | |
| 2807 if (use->is_Proj()) { | |
| 2808 RegMask rm = use->out_RegMask();// Make local copy | |
| 2809 while( rm.is_NotEmpty() ) { | |
| 2810 OptoReg::Name kill = rm.find_first_elem(); | |
| 2811 rm.Remove(kill); | |
| 2812 anti_do_def( b, n, kill, false ); | |
| 2813 } | |
| 2814 } | |
| 2815 } | |
| 2816 } | |
| 2817 | |
| 0 | 2818 // Check each register used by this instruction for a following DEF/KILL |
| 2819 // that must occur afterward and requires an anti-dependence edge. | |
| 2820 for( uint j=0; j<n->req(); j++ ) { | |
| 2821 Node *def = n->in(j); | |
| 2822 if( def ) { | |
| 3842 | 2823 assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" ); |
| 0 | 2824 anti_do_use( b, n, _regalloc->get_reg_first(def) ); |
| 2825 anti_do_use( b, n, _regalloc->get_reg_second(def) ); | |
| 2826 } | |
| 2827 } | |
| 2828 // Do not allow defs of new derived values to float above GC | |
| 2829 // points unless the base is definitely available at the GC point. | |
| 2830 | |
|
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|
2831 Node *m = b->get_node(i); |
| 0 | 2832 |
| 2833 // Add precedence edge from following safepoint to use of derived pointer | |
| 2834 if( last_safept_node != end_node && | |
| 2835 m != last_safept_node) { | |
| 2836 for (uint k = 1; k < m->req(); k++) { | |
| 2837 const Type *t = m->in(k)->bottom_type(); | |
| 2838 if( t->isa_oop_ptr() && | |
| 2839 t->is_ptr()->offset() != 0 ) { | |
| 2840 last_safept_node->add_prec( m ); | |
| 2841 break; | |
| 2842 } | |
| 2843 } | |
| 2844 } | |
| 2845 | |
| 2846 if( n->jvms() ) { // Precedence edge from derived to safept | |
| 2847 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use() | |
|
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|
2848 if( b->get_node(last_safept) != last_safept_node ) { |
| 0 | 2849 last_safept = b->find_node(last_safept_node); |
| 2850 } | |
| 2851 for( uint j=last_safept; j > i; j-- ) { | |
|
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|
2852 Node *mach = b->get_node(j); |
| 0 | 2853 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP ) |
| 2854 mach->add_prec( n ); | |
| 2855 } | |
| 2856 last_safept = i; | |
| 2857 last_safept_node = m; | |
| 2858 } | |
| 2859 } | |
| 2860 | |
| 2861 if (fat_proj_seen) { | |
| 2862 // Garbage collect pinch nodes that were not consumed. | |
| 2863 // They are usually created by a fat kill MachProj for a call. | |
| 2864 garbage_collect_pinch_nodes(); | |
| 2865 } | |
| 2866 } | |
| 2867 | |
| 2868 // Garbage collect pinch nodes for reuse by other blocks. | |
| 2869 // | |
| 2870 // The block scheduler's insertion of anti-dependence | |
| 2871 // edges creates many pinch nodes when the block contains | |
| 2872 // 2 or more Calls. A pinch node is used to prevent a | |
| 2873 // combinatorial explosion of edges. If a set of kills for a | |
| 2874 // register is anti-dependent on a set of uses (or defs), rather | |
| 2875 // than adding an edge in the graph between each pair of kill | |
| 2876 // and use (or def), a pinch is inserted between them: | |
| 2877 // | |
| 2878 // use1 use2 use3 | |
| 2879 // \ | / | |
| 2880 // \ | / | |
| 2881 // pinch | |
| 2882 // / | \ | |
| 2883 // / | \ | |
| 2884 // kill1 kill2 kill3 | |
| 2885 // | |
| 2886 // One pinch node is created per register killed when | |
| 2887 // the second call is encountered during a backwards pass | |
| 2888 // over the block. Most of these pinch nodes are never | |
| 2889 // wired into the graph because the register is never | |
| 2890 // used or def'ed in the block. | |
| 2891 // | |
| 2892 void Scheduling::garbage_collect_pinch_nodes() { | |
| 2893 #ifndef PRODUCT | |
| 2894 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:"); | |
| 2895 #endif | |
| 2896 int trace_cnt = 0; | |
| 2897 for (uint k = 0; k < _reg_node.Size(); k++) { | |
| 2898 Node* pinch = _reg_node[k]; | |
|
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|
2899 if ((pinch != NULL) && pinch->Opcode() == Op_Node && |
| 0 | 2900 // no predecence input edges |
| 2901 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) { | |
| 2902 cleanup_pinch(pinch); | |
| 2903 _pinch_free_list.push(pinch); | |
| 2904 _reg_node.map(k, NULL); | |
| 2905 #ifndef PRODUCT | |
| 2906 if (_cfg->C->trace_opto_output()) { | |
| 2907 trace_cnt++; | |
| 2908 if (trace_cnt > 40) { | |
| 2909 tty->print("\n"); | |
| 2910 trace_cnt = 0; | |
| 2911 } | |
| 2912 tty->print(" %d", pinch->_idx); | |
| 2913 } | |
| 2914 #endif | |
| 2915 } | |
| 2916 } | |
| 2917 #ifndef PRODUCT | |
| 2918 if (_cfg->C->trace_opto_output()) tty->print("\n"); | |
| 2919 #endif | |
| 2920 } | |
| 2921 | |
| 2922 // Clean up a pinch node for reuse. | |
| 2923 void Scheduling::cleanup_pinch( Node *pinch ) { | |
| 2924 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking"); | |
| 2925 | |
| 2926 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) { | |
| 2927 Node* use = pinch->last_out(i); | |
| 2928 uint uses_found = 0; | |
| 2929 for (uint j = use->req(); j < use->len(); j++) { | |
| 2930 if (use->in(j) == pinch) { | |
| 2931 use->rm_prec(j); | |
| 2932 uses_found++; | |
| 2933 } | |
| 2934 } | |
| 2935 assert(uses_found > 0, "must be a precedence edge"); | |
| 2936 i -= uses_found; // we deleted 1 or more copies of this edge | |
| 2937 } | |
| 2938 // May have a later_def entry | |
| 2939 pinch->set_req(0, NULL); | |
| 2940 } | |
| 2941 | |
| 2942 #ifndef PRODUCT | |
| 2943 | |
| 2944 void Scheduling::dump_available() const { | |
| 2945 tty->print("#Availist "); | |
| 2946 for (uint i = 0; i < _available.size(); i++) | |
| 2947 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]); | |
| 2948 tty->cr(); | |
| 2949 } | |
| 2950 | |
| 2951 // Print Scheduling Statistics | |
| 2952 void Scheduling::print_statistics() { | |
| 2953 // Print the size added by nops for bundling | |
| 2954 tty->print("Nops added %d bytes to total of %d bytes", | |
| 2955 _total_nop_size, _total_method_size); | |
| 2956 if (_total_method_size > 0) | |
| 2957 tty->print(", for %.2f%%", | |
| 2958 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0); | |
| 2959 tty->print("\n"); | |
| 2960 | |
| 2961 // Print the number of branch shadows filled | |
| 2962 if (Pipeline::_branch_has_delay_slot) { | |
| 2963 tty->print("Of %d branches, %d had unconditional delay slots filled", | |
| 2964 _total_branches, _total_unconditional_delays); | |
| 2965 if (_total_branches > 0) | |
| 2966 tty->print(", for %.2f%%", | |
| 2967 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0); | |
| 2968 tty->print("\n"); | |
| 2969 } | |
| 2970 | |
| 2971 uint total_instructions = 0, total_bundles = 0; | |
| 2972 | |
| 2973 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) { | |
| 2974 uint bundle_count = _total_instructions_per_bundle[i]; | |
| 2975 total_instructions += bundle_count * i; | |
| 2976 total_bundles += bundle_count; | |
| 2977 } | |
| 2978 | |
| 2979 if (total_bundles > 0) | |
| 2980 tty->print("Average ILP (excluding nops) is %.2f\n", | |
| 2981 ((double)total_instructions) / ((double)total_bundles)); | |
| 2982 } | |
| 2983 #endif |