Mercurial > hg > graal-compiler
annotate src/share/vm/opto/output.cpp @ 63:eac007780a58
6671807: (Escape Analysis) Add new ideal node to represent the state of a scalarized object at a safepoint
Summary: Values of non-static fields of a scalarized object should be saved in debug info to reallocate the object during deoptimization.
Reviewed-by: never
| author | kvn |
|---|---|
| date | Thu, 13 Mar 2008 16:06:34 -0700 |
| parents | 67914967a4b5 |
| children | 6dbf1a175d6b |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_output.cpp.incl" | |
| 27 | |
| 28 extern uint size_java_to_interp(); | |
| 29 extern uint reloc_java_to_interp(); | |
| 30 extern uint size_exception_handler(); | |
| 31 extern uint size_deopt_handler(); | |
| 32 | |
| 33 #ifndef PRODUCT | |
| 34 #define DEBUG_ARG(x) , x | |
| 35 #else | |
| 36 #define DEBUG_ARG(x) | |
| 37 #endif | |
| 38 | |
| 39 extern int emit_exception_handler(CodeBuffer &cbuf); | |
| 40 extern int emit_deopt_handler(CodeBuffer &cbuf); | |
| 41 | |
| 42 //------------------------------Output----------------------------------------- | |
| 43 // Convert Nodes to instruction bits and pass off to the VM | |
| 44 void Compile::Output() { | |
| 45 // RootNode goes | |
| 46 assert( _cfg->_broot->_nodes.size() == 0, "" ); | |
| 47 | |
| 48 // Initialize the space for the BufferBlob used to find and verify | |
| 49 // instruction size in MachNode::emit_size() | |
| 50 init_scratch_buffer_blob(); | |
| 51 | |
| 52 // Make sure I can find the Start Node | |
| 53 Block_Array& bbs = _cfg->_bbs; | |
| 54 Block *entry = _cfg->_blocks[1]; | |
| 55 Block *broot = _cfg->_broot; | |
| 56 | |
| 57 const StartNode *start = entry->_nodes[0]->as_Start(); | |
| 58 | |
| 59 // Replace StartNode with prolog | |
| 60 MachPrologNode *prolog = new (this) MachPrologNode(); | |
| 61 entry->_nodes.map( 0, prolog ); | |
| 62 bbs.map( prolog->_idx, entry ); | |
| 63 bbs.map( start->_idx, NULL ); // start is no longer in any block | |
| 64 | |
| 65 // Virtual methods need an unverified entry point | |
| 66 | |
| 67 if( is_osr_compilation() ) { | |
| 68 if( PoisonOSREntry ) { | |
| 69 // TODO: Should use a ShouldNotReachHereNode... | |
| 70 _cfg->insert( broot, 0, new (this) MachBreakpointNode() ); | |
| 71 } | |
| 72 } else { | |
| 73 if( _method && !_method->flags().is_static() ) { | |
| 74 // Insert unvalidated entry point | |
| 75 _cfg->insert( broot, 0, new (this) MachUEPNode() ); | |
| 76 } | |
| 77 | |
| 78 } | |
| 79 | |
| 80 | |
| 81 // Break before main entry point | |
| 82 if( (_method && _method->break_at_execute()) | |
| 83 #ifndef PRODUCT | |
| 84 ||(OptoBreakpoint && is_method_compilation()) | |
| 85 ||(OptoBreakpointOSR && is_osr_compilation()) | |
| 86 ||(OptoBreakpointC2R && !_method) | |
| 87 #endif | |
| 88 ) { | |
| 89 // checking for _method means that OptoBreakpoint does not apply to | |
| 90 // runtime stubs or frame converters | |
| 91 _cfg->insert( entry, 1, new (this) MachBreakpointNode() ); | |
| 92 } | |
| 93 | |
| 94 // Insert epilogs before every return | |
| 95 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
| 96 Block *b = _cfg->_blocks[i]; | |
| 97 if( !b->is_connector() && b->non_connector_successor(0) == _cfg->_broot ) { // Found a program exit point? | |
| 98 Node *m = b->end(); | |
| 99 if( m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt ) { | |
| 100 MachEpilogNode *epilog = new (this) MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return); | |
| 101 b->add_inst( epilog ); | |
| 102 bbs.map(epilog->_idx, b); | |
| 103 //_regalloc->set_bad(epilog->_idx); // Already initialized this way. | |
| 104 } | |
| 105 } | |
| 106 } | |
| 107 | |
| 108 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 109 if ( ZapDeadCompiledLocals ) Insert_zap_nodes(); | |
| 110 # endif | |
| 111 | |
| 112 ScheduleAndBundle(); | |
| 113 | |
| 114 #ifndef PRODUCT | |
| 115 if (trace_opto_output()) { | |
| 116 tty->print("\n---- After ScheduleAndBundle ----\n"); | |
| 117 for (uint i = 0; i < _cfg->_num_blocks; i++) { | |
| 118 tty->print("\nBB#%03d:\n", i); | |
| 119 Block *bb = _cfg->_blocks[i]; | |
| 120 for (uint j = 0; j < bb->_nodes.size(); j++) { | |
| 121 Node *n = bb->_nodes[j]; | |
| 122 OptoReg::Name reg = _regalloc->get_reg_first(n); | |
| 123 tty->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : ""); | |
| 124 n->dump(); | |
| 125 } | |
| 126 } | |
| 127 } | |
| 128 #endif | |
| 129 | |
| 130 if (failing()) return; | |
| 131 | |
| 132 BuildOopMaps(); | |
| 133 | |
| 134 if (failing()) return; | |
| 135 | |
| 136 Fill_buffer(); | |
| 137 } | |
| 138 | |
| 139 bool Compile::need_stack_bang(int frame_size_in_bytes) const { | |
| 140 // Determine if we need to generate a stack overflow check. | |
| 141 // Do it if the method is not a stub function and | |
| 142 // has java calls or has frame size > vm_page_size/8. | |
| 143 return (stub_function() == NULL && | |
| 144 (has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3)); | |
| 145 } | |
| 146 | |
| 147 bool Compile::need_register_stack_bang() const { | |
| 148 // Determine if we need to generate a register stack overflow check. | |
| 149 // This is only used on architectures which have split register | |
| 150 // and memory stacks (ie. IA64). | |
| 151 // Bang if the method is not a stub function and has java calls | |
| 152 return (stub_function() == NULL && has_java_calls()); | |
| 153 } | |
| 154 | |
| 155 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 156 | |
| 157 | |
| 158 // In order to catch compiler oop-map bugs, we have implemented | |
| 159 // a debugging mode called ZapDeadCompilerLocals. | |
| 160 // This mode causes the compiler to insert a call to a runtime routine, | |
| 161 // "zap_dead_locals", right before each place in compiled code | |
| 162 // that could potentially be a gc-point (i.e., a safepoint or oop map point). | |
| 163 // The runtime routine checks that locations mapped as oops are really | |
| 164 // oops, that locations mapped as values do not look like oops, | |
| 165 // and that locations mapped as dead are not used later | |
| 166 // (by zapping them to an invalid address). | |
| 167 | |
| 168 int Compile::_CompiledZap_count = 0; | |
| 169 | |
| 170 void Compile::Insert_zap_nodes() { | |
| 171 bool skip = false; | |
| 172 | |
| 173 | |
| 174 // Dink with static counts because code code without the extra | |
| 175 // runtime calls is MUCH faster for debugging purposes | |
| 176 | |
| 177 if ( CompileZapFirst == 0 ) ; // nothing special | |
| 178 else if ( CompileZapFirst > CompiledZap_count() ) skip = true; | |
| 179 else if ( CompileZapFirst == CompiledZap_count() ) | |
| 180 warning("starting zap compilation after skipping"); | |
| 181 | |
| 182 if ( CompileZapLast == -1 ) ; // nothing special | |
| 183 else if ( CompileZapLast < CompiledZap_count() ) skip = true; | |
| 184 else if ( CompileZapLast == CompiledZap_count() ) | |
| 185 warning("about to compile last zap"); | |
| 186 | |
| 187 ++_CompiledZap_count; // counts skipped zaps, too | |
| 188 | |
| 189 if ( skip ) return; | |
| 190 | |
| 191 | |
| 192 if ( _method == NULL ) | |
| 193 return; // no safepoints/oopmaps emitted for calls in stubs,so we don't care | |
| 194 | |
| 195 // Insert call to zap runtime stub before every node with an oop map | |
| 196 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
| 197 Block *b = _cfg->_blocks[i]; | |
| 198 for ( uint j = 0; j < b->_nodes.size(); ++j ) { | |
| 199 Node *n = b->_nodes[j]; | |
| 200 | |
| 201 // Determining if we should insert a zap-a-lot node in output. | |
| 202 // We do that for all nodes that has oopmap info, except for calls | |
| 203 // to allocation. Calls to allocation passes in the old top-of-eden pointer | |
| 204 // and expect the C code to reset it. Hence, there can be no safepoints between | |
| 205 // the inlined-allocation and the call to new_Java, etc. | |
| 206 // We also cannot zap monitor calls, as they must hold the microlock | |
| 207 // during the call to Zap, which also wants to grab the microlock. | |
| 208 bool insert = n->is_MachSafePoint() && (n->as_MachSafePoint()->oop_map() != NULL); | |
| 209 if ( insert ) { // it is MachSafePoint | |
| 210 if ( !n->is_MachCall() ) { | |
| 211 insert = false; | |
| 212 } else if ( n->is_MachCall() ) { | |
| 213 MachCallNode* call = n->as_MachCall(); | |
| 214 if (call->entry_point() == OptoRuntime::new_instance_Java() || | |
| 215 call->entry_point() == OptoRuntime::new_array_Java() || | |
| 216 call->entry_point() == OptoRuntime::multianewarray2_Java() || | |
| 217 call->entry_point() == OptoRuntime::multianewarray3_Java() || | |
| 218 call->entry_point() == OptoRuntime::multianewarray4_Java() || | |
| 219 call->entry_point() == OptoRuntime::multianewarray5_Java() || | |
| 220 call->entry_point() == OptoRuntime::slow_arraycopy_Java() || | |
| 221 call->entry_point() == OptoRuntime::complete_monitor_locking_Java() | |
| 222 ) { | |
| 223 insert = false; | |
| 224 } | |
| 225 } | |
| 226 if (insert) { | |
| 227 Node *zap = call_zap_node(n->as_MachSafePoint(), i); | |
| 228 b->_nodes.insert( j, zap ); | |
| 229 _cfg->_bbs.map( zap->_idx, b ); | |
| 230 ++j; | |
| 231 } | |
| 232 } | |
| 233 } | |
| 234 } | |
| 235 } | |
| 236 | |
| 237 | |
| 238 Node* Compile::call_zap_node(MachSafePointNode* node_to_check, int block_no) { | |
| 239 const TypeFunc *tf = OptoRuntime::zap_dead_locals_Type(); | |
| 240 CallStaticJavaNode* ideal_node = | |
| 241 new (this, tf->domain()->cnt()) CallStaticJavaNode( tf, | |
| 242 OptoRuntime::zap_dead_locals_stub(_method->flags().is_native()), | |
| 243 "call zap dead locals stub", 0, TypePtr::BOTTOM); | |
| 244 // We need to copy the OopMap from the site we're zapping at. | |
| 245 // We have to make a copy, because the zap site might not be | |
| 246 // a call site, and zap_dead is a call site. | |
| 247 OopMap* clone = node_to_check->oop_map()->deep_copy(); | |
| 248 | |
| 249 // Add the cloned OopMap to the zap node | |
| 250 ideal_node->set_oop_map(clone); | |
| 251 return _matcher->match_sfpt(ideal_node); | |
| 252 } | |
| 253 | |
| 254 //------------------------------is_node_getting_a_safepoint-------------------- | |
| 255 bool Compile::is_node_getting_a_safepoint( Node* n) { | |
| 256 // This code duplicates the logic prior to the call of add_safepoint | |
| 257 // below in this file. | |
| 258 if( n->is_MachSafePoint() ) return true; | |
| 259 return false; | |
| 260 } | |
| 261 | |
| 262 # endif // ENABLE_ZAP_DEAD_LOCALS | |
| 263 | |
| 264 //------------------------------compute_loop_first_inst_sizes------------------ | |
| 265 // Compute the size of first NumberOfLoopInstrToAlign instructions at head | |
| 266 // of a loop. When aligning a loop we need to provide enough instructions | |
| 267 // in cpu's fetch buffer to feed decoders. The loop alignment could be | |
| 268 // avoided if we have enough instructions in fetch buffer at the head of a loop. | |
| 269 // By default, the size is set to 999999 by Block's constructor so that | |
| 270 // a loop will be aligned if the size is not reset here. | |
| 271 // | |
| 272 // Note: Mach instructions could contain several HW instructions | |
| 273 // so the size is estimated only. | |
| 274 // | |
| 275 void Compile::compute_loop_first_inst_sizes() { | |
| 276 // The next condition is used to gate the loop alignment optimization. | |
| 277 // Don't aligned a loop if there are enough instructions at the head of a loop | |
| 278 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad | |
| 279 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is | |
| 280 // equal to 11 bytes which is the largest address NOP instruction. | |
| 281 if( MaxLoopPad < OptoLoopAlignment-1 ) { | |
| 282 uint last_block = _cfg->_num_blocks-1; | |
| 283 for( uint i=1; i <= last_block; i++ ) { | |
| 284 Block *b = _cfg->_blocks[i]; | |
| 285 // Check the first loop's block which requires an alignment. | |
| 286 if( b->head()->is_Loop() && | |
| 287 b->code_alignment() > (uint)relocInfo::addr_unit() ) { | |
| 288 uint sum_size = 0; | |
| 289 uint inst_cnt = NumberOfLoopInstrToAlign; | |
| 290 inst_cnt = b->compute_first_inst_size(sum_size, inst_cnt, | |
| 291 _regalloc); | |
| 292 // Check the next fallthrough block if first loop's block does not have | |
| 293 // enough instructions. | |
| 294 if( inst_cnt > 0 && i < last_block ) { | |
| 295 // First, check if the first loop's block contains whole loop. | |
| 296 // LoopNode::LoopBackControl == 2. | |
| 297 Block *bx = _cfg->_bbs[b->pred(2)->_idx]; | |
| 298 // Skip connector blocks (with limit in case of irreducible loops). | |
| 299 int search_limit = 16; | |
| 300 while( bx->is_connector() && search_limit-- > 0) { | |
| 301 bx = _cfg->_bbs[bx->pred(1)->_idx]; | |
| 302 } | |
| 303 if( bx != b ) { // loop body is in several blocks. | |
| 304 Block *nb = NULL; | |
| 305 while( inst_cnt > 0 && i < last_block && nb != bx && | |
| 306 !_cfg->_blocks[i+1]->head()->is_Loop() ) { | |
| 307 i++; | |
| 308 nb = _cfg->_blocks[i]; | |
| 309 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, | |
| 310 _regalloc); | |
| 311 } // while( inst_cnt > 0 && i < last_block ) | |
| 312 } // if( bx != b ) | |
| 313 } // if( inst_cnt > 0 && i < last_block ) | |
| 314 b->set_first_inst_size(sum_size); | |
| 315 } // f( b->head()->is_Loop() ) | |
| 316 } // for( i <= last_block ) | |
| 317 } // if( MaxLoopPad < OptoLoopAlignment-1 ) | |
| 318 } | |
| 319 | |
| 320 //----------------------Shorten_branches--------------------------------------- | |
| 321 // The architecture description provides short branch variants for some long | |
| 322 // branch instructions. Replace eligible long branches with short branches. | |
| 323 void Compile::Shorten_branches(Label *labels, int& code_size, int& reloc_size, int& stub_size, int& const_size) { | |
| 324 | |
| 325 // fill in the nop array for bundling computations | |
| 326 MachNode *_nop_list[Bundle::_nop_count]; | |
| 327 Bundle::initialize_nops(_nop_list, this); | |
| 328 | |
| 329 // ------------------ | |
| 330 // Compute size of each block, method size, and relocation information size | |
| 331 uint *jmp_end = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks); | |
| 332 uint *blk_starts = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks+1); | |
| 333 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks); ) | |
| 334 blk_starts[0] = 0; | |
| 335 | |
| 336 // Initialize the sizes to 0 | |
| 337 code_size = 0; // Size in bytes of generated code | |
| 338 stub_size = 0; // Size in bytes of all stub entries | |
| 339 // Size in bytes of all relocation entries, including those in local stubs. | |
| 340 // Start with 2-bytes of reloc info for the unvalidated entry point | |
| 341 reloc_size = 1; // Number of relocation entries | |
| 342 const_size = 0; // size of fp constants in words | |
| 343 | |
| 344 // Make three passes. The first computes pessimistic blk_starts, | |
| 345 // relative jmp_end, reloc_size and const_size information. | |
| 346 // The second performs short branch substitution using the pessimistic | |
| 347 // sizing. The third inserts nops where needed. | |
| 348 | |
| 349 Node *nj; // tmp | |
| 350 | |
| 351 // Step one, perform a pessimistic sizing pass. | |
| 352 uint i; | |
| 353 uint min_offset_from_last_call = 1; // init to a positive value | |
| 354 uint nop_size = (new (this) MachNopNode())->size(_regalloc); | |
| 355 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
| 356 Block *b = _cfg->_blocks[i]; | |
| 357 | |
| 358 // Sum all instruction sizes to compute block size | |
| 359 uint last_inst = b->_nodes.size(); | |
| 360 uint blk_size = 0; | |
| 361 for( uint j = 0; j<last_inst; j++ ) { | |
| 362 nj = b->_nodes[j]; | |
| 363 uint inst_size = nj->size(_regalloc); | |
| 364 blk_size += inst_size; | |
| 365 // Handle machine instruction nodes | |
| 366 if( nj->is_Mach() ) { | |
| 367 MachNode *mach = nj->as_Mach(); | |
| 368 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding | |
| 369 reloc_size += mach->reloc(); | |
| 370 const_size += mach->const_size(); | |
| 371 if( mach->is_MachCall() ) { | |
| 372 MachCallNode *mcall = mach->as_MachCall(); | |
| 373 // This destination address is NOT PC-relative | |
| 374 | |
| 375 mcall->method_set((intptr_t)mcall->entry_point()); | |
| 376 | |
| 377 if( mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method ) { | |
| 378 stub_size += size_java_to_interp(); | |
| 379 reloc_size += reloc_java_to_interp(); | |
| 380 } | |
| 381 } else if (mach->is_MachSafePoint()) { | |
| 382 // If call/safepoint are adjacent, account for possible | |
| 383 // nop to disambiguate the two safepoints. | |
| 384 if (min_offset_from_last_call == 0) { | |
| 385 blk_size += nop_size; | |
| 386 } | |
| 387 } | |
| 388 } | |
| 389 min_offset_from_last_call += inst_size; | |
| 390 // Remember end of call offset | |
| 391 if (nj->is_MachCall() && nj->as_MachCall()->is_safepoint_node()) { | |
| 392 min_offset_from_last_call = 0; | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 // During short branch replacement, we store the relative (to blk_starts) | |
| 397 // end of jump in jmp_end, rather than the absolute end of jump. This | |
| 398 // is so that we do not need to recompute sizes of all nodes when we compute | |
| 399 // correct blk_starts in our next sizing pass. | |
| 400 jmp_end[i] = blk_size; | |
| 401 DEBUG_ONLY( jmp_target[i] = 0; ) | |
| 402 | |
| 403 // When the next block starts a loop, we may insert pad NOP | |
| 404 // instructions. Since we cannot know our future alignment, | |
| 405 // assume the worst. | |
| 406 if( i<_cfg->_num_blocks-1 ) { | |
| 407 Block *nb = _cfg->_blocks[i+1]; | |
| 408 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit(); | |
| 409 if( max_loop_pad > 0 ) { | |
| 410 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), ""); | |
| 411 blk_size += max_loop_pad; | |
| 412 } | |
| 413 } | |
| 414 | |
| 415 // Save block size; update total method size | |
| 416 blk_starts[i+1] = blk_starts[i]+blk_size; | |
| 417 } | |
| 418 | |
| 419 // Step two, replace eligible long jumps. | |
| 420 | |
| 421 // Note: this will only get the long branches within short branch | |
| 422 // range. Another pass might detect more branches that became | |
| 423 // candidates because the shortening in the first pass exposed | |
| 424 // more opportunities. Unfortunately, this would require | |
| 425 // recomputing the starting and ending positions for the blocks | |
| 426 for( i=0; i<_cfg->_num_blocks; i++ ) { | |
| 427 Block *b = _cfg->_blocks[i]; | |
| 428 | |
| 429 int j; | |
| 430 // Find the branch; ignore trailing NOPs. | |
| 431 for( j = b->_nodes.size()-1; j>=0; j-- ) { | |
| 432 nj = b->_nodes[j]; | |
| 433 if( !nj->is_Mach() || nj->as_Mach()->ideal_Opcode() != Op_Con ) | |
| 434 break; | |
| 435 } | |
| 436 | |
| 437 if (j >= 0) { | |
| 438 if( nj->is_Mach() && nj->as_Mach()->may_be_short_branch() ) { | |
| 439 MachNode *mach = nj->as_Mach(); | |
| 440 // This requires the TRUE branch target be in succs[0] | |
| 441 uint bnum = b->non_connector_successor(0)->_pre_order; | |
| 442 uintptr_t target = blk_starts[bnum]; | |
| 443 if( mach->is_pc_relative() ) { | |
| 444 int offset = target-(blk_starts[i] + jmp_end[i]); | |
| 445 if (_matcher->is_short_branch_offset(offset)) { | |
| 446 // We've got a winner. Replace this branch. | |
| 447 MachNode *replacement = mach->short_branch_version(this); | |
| 448 b->_nodes.map(j, replacement); | |
| 449 | |
| 450 // Update the jmp_end size to save time in our | |
| 451 // next pass. | |
| 452 jmp_end[i] -= (mach->size(_regalloc) - replacement->size(_regalloc)); | |
| 453 DEBUG_ONLY( jmp_target[i] = bnum; ); | |
| 454 } | |
| 455 } else { | |
| 456 #ifndef PRODUCT | |
| 457 mach->dump(3); | |
| 458 #endif | |
| 459 Unimplemented(); | |
| 460 } | |
| 461 } | |
| 462 } | |
| 463 } | |
| 464 | |
| 465 // Compute the size of first NumberOfLoopInstrToAlign instructions at head | |
| 466 // of a loop. It is used to determine the padding for loop alignment. | |
| 467 compute_loop_first_inst_sizes(); | |
| 468 | |
| 469 // Step 3, compute the offsets of all the labels | |
| 470 uint last_call_adr = max_uint; | |
| 471 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
| 472 // copy the offset of the beginning to the corresponding label | |
| 473 assert(labels[i].is_unused(), "cannot patch at this point"); | |
| 474 labels[i].bind_loc(blk_starts[i], CodeBuffer::SECT_INSTS); | |
| 475 | |
| 476 // insert padding for any instructions that need it | |
| 477 Block *b = _cfg->_blocks[i]; | |
| 478 uint last_inst = b->_nodes.size(); | |
| 479 uint adr = blk_starts[i]; | |
| 480 for( uint j = 0; j<last_inst; j++ ) { | |
| 481 nj = b->_nodes[j]; | |
| 482 if( nj->is_Mach() ) { | |
| 483 int padding = nj->as_Mach()->compute_padding(adr); | |
| 484 // If call/safepoint are adjacent insert a nop (5010568) | |
| 485 if (padding == 0 && nj->is_MachSafePoint() && !nj->is_MachCall() && | |
| 486 adr == last_call_adr ) { | |
| 487 padding = nop_size; | |
| 488 } | |
| 489 if(padding > 0) { | |
| 490 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); | |
| 491 int nops_cnt = padding / nop_size; | |
| 492 MachNode *nop = new (this) MachNopNode(nops_cnt); | |
| 493 b->_nodes.insert(j++, nop); | |
| 494 _cfg->_bbs.map( nop->_idx, b ); | |
| 495 adr += padding; | |
| 496 last_inst++; | |
| 497 } | |
| 498 } | |
| 499 adr += nj->size(_regalloc); | |
| 500 | |
| 501 // Remember end of call offset | |
| 502 if (nj->is_MachCall() && nj->as_MachCall()->is_safepoint_node()) { | |
| 503 last_call_adr = adr; | |
| 504 } | |
| 505 } | |
| 506 | |
| 507 if ( i != _cfg->_num_blocks-1) { | |
| 508 // Get the size of the block | |
| 509 uint blk_size = adr - blk_starts[i]; | |
| 510 | |
| 511 // When the next block starts a loop, we may insert pad NOP | |
| 512 // instructions. | |
| 513 Block *nb = _cfg->_blocks[i+1]; | |
| 514 int current_offset = blk_starts[i] + blk_size; | |
| 515 current_offset += nb->alignment_padding(current_offset); | |
| 516 // Save block size; update total method size | |
| 517 blk_starts[i+1] = current_offset; | |
| 518 } | |
| 519 } | |
| 520 | |
| 521 #ifdef ASSERT | |
| 522 for( i=0; i<_cfg->_num_blocks; i++ ) { // For all blocks | |
| 523 if( jmp_target[i] != 0 ) { | |
| 524 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_end[i]); | |
| 525 if (!_matcher->is_short_branch_offset(offset)) { | |
| 526 tty->print_cr("target (%d) - jmp_end(%d) = offset (%d), jmp_block B%d, target_block B%d", blk_starts[jmp_target[i]], blk_starts[i] + jmp_end[i], offset, i, jmp_target[i]); | |
| 527 } | |
| 528 assert(_matcher->is_short_branch_offset(offset), "Displacement too large for short jmp"); | |
| 529 } | |
| 530 } | |
| 531 #endif | |
| 532 | |
| 533 // ------------------ | |
| 534 // Compute size for code buffer | |
| 535 code_size = blk_starts[i-1] + jmp_end[i-1]; | |
| 536 | |
| 537 // Relocation records | |
| 538 reloc_size += 1; // Relo entry for exception handler | |
| 539 | |
| 540 // Adjust reloc_size to number of record of relocation info | |
| 541 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for | |
| 542 // a relocation index. | |
| 543 // The CodeBuffer will expand the locs array if this estimate is too low. | |
| 544 reloc_size *= 10 / sizeof(relocInfo); | |
| 545 | |
| 546 // Adjust const_size to number of bytes | |
| 547 const_size *= 2*jintSize; // both float and double take two words per entry | |
| 548 | |
| 549 } | |
| 550 | |
| 551 //------------------------------FillLocArray----------------------------------- | |
| 552 // Create a bit of debug info and append it to the array. The mapping is from | |
| 553 // Java local or expression stack to constant, register or stack-slot. For | |
| 554 // doubles, insert 2 mappings and return 1 (to tell the caller that the next | |
| 555 // entry has been taken care of and caller should skip it). | |
| 556 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) { | |
| 557 // This should never have accepted Bad before | |
| 558 assert(OptoReg::is_valid(regnum), "location must be valid"); | |
| 559 return (OptoReg::is_reg(regnum)) | |
| 560 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) ) | |
| 561 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum))); | |
| 562 } | |
| 563 | |
|
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564 |
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565 ObjectValue* |
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566 Compile::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) { |
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567 for (int i = 0; i < objs->length(); i++) { |
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568 assert(objs->at(i)->is_object(), "corrupt object cache"); |
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569 ObjectValue* sv = (ObjectValue*) objs->at(i); |
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570 if (sv->id() == id) { |
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571 return sv; |
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572 } |
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573 } |
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574 // Otherwise.. |
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575 return NULL; |
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576 } |
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577 |
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578 void Compile::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs, |
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579 ObjectValue* sv ) { |
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580 assert(sv_for_node_id(objs, sv->id()) == NULL, "Precondition"); |
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581 objs->append(sv); |
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582 } |
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583 |
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584 |
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585 void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local, |
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586 GrowableArray<ScopeValue*> *array, |
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587 GrowableArray<ScopeValue*> *objs ) { |
| 0 | 588 assert( local, "use _top instead of null" ); |
| 589 if (array->length() != idx) { | |
| 590 assert(array->length() == idx + 1, "Unexpected array count"); | |
| 591 // Old functionality: | |
| 592 // return | |
| 593 // New functionality: | |
| 594 // Assert if the local is not top. In product mode let the new node | |
| 595 // override the old entry. | |
| 596 assert(local == top(), "LocArray collision"); | |
| 597 if (local == top()) { | |
| 598 return; | |
| 599 } | |
| 600 array->pop(); | |
| 601 } | |
| 602 const Type *t = local->bottom_type(); | |
| 603 | |
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604 // Is it a safepoint scalar object node? |
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605 if (local->is_SafePointScalarObject()) { |
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606 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject(); |
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607 |
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608 ObjectValue* sv = Compile::sv_for_node_id(objs, spobj->_idx); |
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609 if (sv == NULL) { |
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610 ciKlass* cik = t->is_oopptr()->klass(); |
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611 assert(cik->is_instance_klass() || |
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612 cik->is_array_klass(), "Not supported allocation."); |
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613 sv = new ObjectValue(spobj->_idx, |
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614 new ConstantOopWriteValue(cik->encoding())); |
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615 Compile::set_sv_for_object_node(objs, sv); |
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616 |
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617 uint first_ind = spobj->first_index(); |
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618 for (uint i = 0; i < spobj->n_fields(); i++) { |
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619 Node* fld_node = sfpt->in(first_ind+i); |
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620 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs); |
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621 } |
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622 } |
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623 array->append(sv); |
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624 return; |
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625 } |
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626 |
| 0 | 627 // Grab the register number for the local |
| 628 OptoReg::Name regnum = _regalloc->get_reg_first(local); | |
| 629 if( OptoReg::is_valid(regnum) ) {// Got a register/stack? | |
| 630 // Record the double as two float registers. | |
| 631 // The register mask for such a value always specifies two adjacent | |
| 632 // float registers, with the lower register number even. | |
| 633 // Normally, the allocation of high and low words to these registers | |
| 634 // is irrelevant, because nearly all operations on register pairs | |
| 635 // (e.g., StoreD) treat them as a single unit. | |
| 636 // Here, we assume in addition that the words in these two registers | |
| 637 // stored "naturally" (by operations like StoreD and double stores | |
| 638 // within the interpreter) such that the lower-numbered register | |
| 639 // is written to the lower memory address. This may seem like | |
| 640 // a machine dependency, but it is not--it is a requirement on | |
| 641 // the author of the <arch>.ad file to ensure that, for every | |
| 642 // even/odd double-register pair to which a double may be allocated, | |
| 643 // the word in the even single-register is stored to the first | |
| 644 // memory word. (Note that register numbers are completely | |
| 645 // arbitrary, and are not tied to any machine-level encodings.) | |
| 646 #ifdef _LP64 | |
| 647 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) { | |
| 648 array->append(new ConstantIntValue(0)); | |
| 649 array->append(new_loc_value( _regalloc, regnum, Location::dbl )); | |
| 650 } else if ( t->base() == Type::Long ) { | |
| 651 array->append(new ConstantIntValue(0)); | |
| 652 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
| 653 } else if ( t->base() == Type::RawPtr ) { | |
| 654 // jsr/ret return address which must be restored into a the full | |
| 655 // width 64-bit stack slot. | |
| 656 array->append(new_loc_value( _regalloc, regnum, Location::lng )); | |
| 657 } | |
| 658 #else //_LP64 | |
| 659 #ifdef SPARC | |
| 660 if (t->base() == Type::Long && OptoReg::is_reg(regnum)) { | |
| 661 // For SPARC we have to swap high and low words for | |
| 662 // long values stored in a single-register (g0-g7). | |
| 663 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
| 664 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
| 665 } else | |
| 666 #endif //SPARC | |
| 667 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) { | |
| 668 // Repack the double/long as two jints. | |
| 669 // The convention the interpreter uses is that the second local | |
| 670 // holds the first raw word of the native double representation. | |
| 671 // This is actually reasonable, since locals and stack arrays | |
| 672 // grow downwards in all implementations. | |
| 673 // (If, on some machine, the interpreter's Java locals or stack | |
| 674 // were to grow upwards, the embedded doubles would be word-swapped.) | |
| 675 array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal )); | |
| 676 array->append(new_loc_value( _regalloc, regnum , Location::normal )); | |
| 677 } | |
| 678 #endif //_LP64 | |
| 679 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) && | |
| 680 OptoReg::is_reg(regnum) ) { | |
| 681 array->append(new_loc_value( _regalloc, regnum, Matcher::float_in_double | |
| 682 ? Location::float_in_dbl : Location::normal )); | |
| 683 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) { | |
| 684 array->append(new_loc_value( _regalloc, regnum, Matcher::int_in_long | |
| 685 ? Location::int_in_long : Location::normal )); | |
| 686 } else { | |
| 687 array->append(new_loc_value( _regalloc, regnum, _regalloc->is_oop(local) ? Location::oop : Location::normal )); | |
| 688 } | |
| 689 return; | |
| 690 } | |
| 691 | |
| 692 // No register. It must be constant data. | |
| 693 switch (t->base()) { | |
| 694 case Type::Half: // Second half of a double | |
| 695 ShouldNotReachHere(); // Caller should skip 2nd halves | |
| 696 break; | |
| 697 case Type::AnyPtr: | |
| 698 array->append(new ConstantOopWriteValue(NULL)); | |
| 699 break; | |
| 700 case Type::AryPtr: | |
| 701 case Type::InstPtr: | |
| 702 case Type::KlassPtr: // fall through | |
| 703 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->encoding())); | |
| 704 break; | |
| 705 case Type::Int: | |
| 706 array->append(new ConstantIntValue(t->is_int()->get_con())); | |
| 707 break; | |
| 708 case Type::RawPtr: | |
| 709 // A return address (T_ADDRESS). | |
| 710 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI"); | |
| 711 #ifdef _LP64 | |
| 712 // Must be restored to the full-width 64-bit stack slot. | |
| 713 array->append(new ConstantLongValue(t->is_ptr()->get_con())); | |
| 714 #else | |
| 715 array->append(new ConstantIntValue(t->is_ptr()->get_con())); | |
| 716 #endif | |
| 717 break; | |
| 718 case Type::FloatCon: { | |
| 719 float f = t->is_float_constant()->getf(); | |
| 720 array->append(new ConstantIntValue(jint_cast(f))); | |
| 721 break; | |
| 722 } | |
| 723 case Type::DoubleCon: { | |
| 724 jdouble d = t->is_double_constant()->getd(); | |
| 725 #ifdef _LP64 | |
| 726 array->append(new ConstantIntValue(0)); | |
| 727 array->append(new ConstantDoubleValue(d)); | |
| 728 #else | |
| 729 // Repack the double as two jints. | |
| 730 // The convention the interpreter uses is that the second local | |
| 731 // holds the first raw word of the native double representation. | |
| 732 // This is actually reasonable, since locals and stack arrays | |
| 733 // grow downwards in all implementations. | |
| 734 // (If, on some machine, the interpreter's Java locals or stack | |
| 735 // were to grow upwards, the embedded doubles would be word-swapped.) | |
| 736 jint *dp = (jint*)&d; | |
| 737 array->append(new ConstantIntValue(dp[1])); | |
| 738 array->append(new ConstantIntValue(dp[0])); | |
| 739 #endif | |
| 740 break; | |
| 741 } | |
| 742 case Type::Long: { | |
| 743 jlong d = t->is_long()->get_con(); | |
| 744 #ifdef _LP64 | |
| 745 array->append(new ConstantIntValue(0)); | |
| 746 array->append(new ConstantLongValue(d)); | |
| 747 #else | |
| 748 // Repack the long as two jints. | |
| 749 // The convention the interpreter uses is that the second local | |
| 750 // holds the first raw word of the native double representation. | |
| 751 // This is actually reasonable, since locals and stack arrays | |
| 752 // grow downwards in all implementations. | |
| 753 // (If, on some machine, the interpreter's Java locals or stack | |
| 754 // were to grow upwards, the embedded doubles would be word-swapped.) | |
| 755 jint *dp = (jint*)&d; | |
| 756 array->append(new ConstantIntValue(dp[1])); | |
| 757 array->append(new ConstantIntValue(dp[0])); | |
| 758 #endif | |
| 759 break; | |
| 760 } | |
| 761 case Type::Top: // Add an illegal value here | |
| 762 array->append(new LocationValue(Location())); | |
| 763 break; | |
| 764 default: | |
| 765 ShouldNotReachHere(); | |
| 766 break; | |
| 767 } | |
| 768 } | |
| 769 | |
| 770 // Determine if this node starts a bundle | |
| 771 bool Compile::starts_bundle(const Node *n) const { | |
| 772 return (_node_bundling_limit > n->_idx && | |
| 773 _node_bundling_base[n->_idx].starts_bundle()); | |
| 774 } | |
| 775 | |
| 776 //--------------------------Process_OopMap_Node-------------------------------- | |
| 777 void Compile::Process_OopMap_Node(MachNode *mach, int current_offset) { | |
| 778 | |
| 779 // Handle special safepoint nodes for synchronization | |
| 780 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
| 781 MachCallNode *mcall; | |
| 782 | |
| 783 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 784 assert( is_node_getting_a_safepoint(mach), "logic does not match; false negative"); | |
| 785 #endif | |
| 786 | |
| 787 int safepoint_pc_offset = current_offset; | |
| 788 | |
| 789 // Add the safepoint in the DebugInfoRecorder | |
| 790 if( !mach->is_MachCall() ) { | |
| 791 mcall = NULL; | |
| 792 debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map); | |
| 793 } else { | |
| 794 mcall = mach->as_MachCall(); | |
| 795 safepoint_pc_offset += mcall->ret_addr_offset(); | |
| 796 debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map); | |
| 797 } | |
| 798 | |
| 799 // Loop over the JVMState list to add scope information | |
| 800 // Do not skip safepoints with a NULL method, they need monitor info | |
| 801 JVMState* youngest_jvms = sfn->jvms(); | |
| 802 int max_depth = youngest_jvms->depth(); | |
| 803 | |
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804 // Allocate the object pool for scalar-replaced objects -- the map from |
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805 // small-integer keys (which can be recorded in the local and ostack |
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806 // arrays) to descriptions of the object state. |
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807 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>(); |
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808 |
| 0 | 809 // Visit scopes from oldest to youngest. |
| 810 for (int depth = 1; depth <= max_depth; depth++) { | |
| 811 JVMState* jvms = youngest_jvms->of_depth(depth); | |
| 812 int idx; | |
| 813 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
| 814 // Safepoints that do not have method() set only provide oop-map and monitor info | |
| 815 // to support GC; these do not support deoptimization. | |
| 816 int num_locs = (method == NULL) ? 0 : jvms->loc_size(); | |
| 817 int num_exps = (method == NULL) ? 0 : jvms->stk_size(); | |
| 818 int num_mon = jvms->nof_monitors(); | |
| 819 assert(method == NULL || jvms->bci() < 0 || num_locs == method->max_locals(), | |
| 820 "JVMS local count must match that of the method"); | |
| 821 | |
| 822 // Add Local and Expression Stack Information | |
| 823 | |
| 824 // Insert locals into the locarray | |
| 825 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs); | |
| 826 for( idx = 0; idx < num_locs; idx++ ) { | |
|
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827 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs ); |
| 0 | 828 } |
| 829 | |
| 830 // Insert expression stack entries into the exparray | |
| 831 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps); | |
| 832 for( idx = 0; idx < num_exps; idx++ ) { | |
|
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833 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs ); |
| 0 | 834 } |
| 835 | |
| 836 // Add in mappings of the monitors | |
| 837 assert( !method || | |
| 838 !method->is_synchronized() || | |
| 839 method->is_native() || | |
| 840 num_mon > 0 || | |
| 841 !GenerateSynchronizationCode, | |
| 842 "monitors must always exist for synchronized methods"); | |
| 843 | |
| 844 // Build the growable array of ScopeValues for exp stack | |
| 845 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon); | |
| 846 | |
| 847 // Loop over monitors and insert into array | |
| 848 for(idx = 0; idx < num_mon; idx++) { | |
| 849 // Grab the node that defines this monitor | |
| 850 Node* box_node; | |
| 851 Node* obj_node; | |
| 852 box_node = sfn->monitor_box(jvms, idx); | |
| 853 obj_node = sfn->monitor_obj(jvms, idx); | |
| 854 | |
| 855 // Create ScopeValue for object | |
| 856 ScopeValue *scval = NULL; | |
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857 |
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858 if( obj_node->is_SafePointScalarObject() ) { |
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859 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject(); |
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860 scval = Compile::sv_for_node_id(objs, spobj->_idx); |
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861 if (scval == NULL) { |
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862 const Type *t = obj_node->bottom_type(); |
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863 ciKlass* cik = t->is_oopptr()->klass(); |
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864 assert(cik->is_instance_klass() || |
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865 cik->is_array_klass(), "Not supported allocation."); |
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866 ObjectValue* sv = new ObjectValue(spobj->_idx, |
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867 new ConstantOopWriteValue(cik->encoding())); |
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868 Compile::set_sv_for_object_node(objs, sv); |
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869 |
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870 uint first_ind = spobj->first_index(); |
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871 for (uint i = 0; i < spobj->n_fields(); i++) { |
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872 Node* fld_node = sfn->in(first_ind+i); |
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873 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs); |
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874 } |
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875 scval = sv; |
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876 } |
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877 } else if( !obj_node->is_Con() ) { |
| 0 | 878 OptoReg::Name obj_reg = _regalloc->get_reg_first(obj_node); |
| 879 scval = new_loc_value( _regalloc, obj_reg, Location::oop ); | |
| 880 } else { | |
| 881 scval = new ConstantOopWriteValue(obj_node->bottom_type()->is_instptr()->const_oop()->encoding()); | |
| 882 } | |
| 883 | |
| 884 OptoReg::Name box_reg = BoxLockNode::stack_slot(box_node); | |
| 885 monarray->append(new MonitorValue(scval, Location::new_stk_loc(Location::normal,_regalloc->reg2offset(box_reg)))); | |
| 886 } | |
| 887 | |
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888 // We dump the object pool first, since deoptimization reads it in first. |
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889 debug_info()->dump_object_pool(objs); |
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890 |
| 0 | 891 // Build first class objects to pass to scope |
| 892 DebugToken *locvals = debug_info()->create_scope_values(locarray); | |
| 893 DebugToken *expvals = debug_info()->create_scope_values(exparray); | |
| 894 DebugToken *monvals = debug_info()->create_monitor_values(monarray); | |
| 895 | |
| 896 // Make method available for all Safepoints | |
| 897 ciMethod* scope_method = method ? method : _method; | |
| 898 // Describe the scope here | |
| 899 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI"); | |
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900 // Now we can describe the scope. |
| 0 | 901 debug_info()->describe_scope(safepoint_pc_offset,scope_method,jvms->bci(),locvals,expvals,monvals); |
| 902 } // End jvms loop | |
| 903 | |
| 904 // Mark the end of the scope set. | |
| 905 debug_info()->end_safepoint(safepoint_pc_offset); | |
| 906 } | |
| 907 | |
| 908 | |
| 909 | |
| 910 // A simplified version of Process_OopMap_Node, to handle non-safepoints. | |
| 911 class NonSafepointEmitter { | |
| 912 Compile* C; | |
| 913 JVMState* _pending_jvms; | |
| 914 int _pending_offset; | |
| 915 | |
| 916 void emit_non_safepoint(); | |
| 917 | |
| 918 public: | |
| 919 NonSafepointEmitter(Compile* compile) { | |
| 920 this->C = compile; | |
| 921 _pending_jvms = NULL; | |
| 922 _pending_offset = 0; | |
| 923 } | |
| 924 | |
| 925 void observe_instruction(Node* n, int pc_offset) { | |
| 926 if (!C->debug_info()->recording_non_safepoints()) return; | |
| 927 | |
| 928 Node_Notes* nn = C->node_notes_at(n->_idx); | |
| 929 if (nn == NULL || nn->jvms() == NULL) return; | |
| 930 if (_pending_jvms != NULL && | |
| 931 _pending_jvms->same_calls_as(nn->jvms())) { | |
| 932 // Repeated JVMS? Stretch it up here. | |
| 933 _pending_offset = pc_offset; | |
| 934 } else { | |
| 935 if (_pending_jvms != NULL && | |
| 936 _pending_offset < pc_offset) { | |
| 937 emit_non_safepoint(); | |
| 938 } | |
| 939 _pending_jvms = NULL; | |
| 940 if (pc_offset > C->debug_info()->last_pc_offset()) { | |
| 941 // This is the only way _pending_jvms can become non-NULL: | |
| 942 _pending_jvms = nn->jvms(); | |
| 943 _pending_offset = pc_offset; | |
| 944 } | |
| 945 } | |
| 946 } | |
| 947 | |
| 948 // Stay out of the way of real safepoints: | |
| 949 void observe_safepoint(JVMState* jvms, int pc_offset) { | |
| 950 if (_pending_jvms != NULL && | |
| 951 !_pending_jvms->same_calls_as(jvms) && | |
| 952 _pending_offset < pc_offset) { | |
| 953 emit_non_safepoint(); | |
| 954 } | |
| 955 _pending_jvms = NULL; | |
| 956 } | |
| 957 | |
| 958 void flush_at_end() { | |
| 959 if (_pending_jvms != NULL) { | |
| 960 emit_non_safepoint(); | |
| 961 } | |
| 962 _pending_jvms = NULL; | |
| 963 } | |
| 964 }; | |
| 965 | |
| 966 void NonSafepointEmitter::emit_non_safepoint() { | |
| 967 JVMState* youngest_jvms = _pending_jvms; | |
| 968 int pc_offset = _pending_offset; | |
| 969 | |
| 970 // Clear it now: | |
| 971 _pending_jvms = NULL; | |
| 972 | |
| 973 DebugInformationRecorder* debug_info = C->debug_info(); | |
| 974 assert(debug_info->recording_non_safepoints(), "sanity"); | |
| 975 | |
| 976 debug_info->add_non_safepoint(pc_offset); | |
| 977 int max_depth = youngest_jvms->depth(); | |
| 978 | |
| 979 // Visit scopes from oldest to youngest. | |
| 980 for (int depth = 1; depth <= max_depth; depth++) { | |
| 981 JVMState* jvms = youngest_jvms->of_depth(depth); | |
| 982 ciMethod* method = jvms->has_method() ? jvms->method() : NULL; | |
| 983 debug_info->describe_scope(pc_offset, method, jvms->bci()); | |
| 984 } | |
| 985 | |
| 986 // Mark the end of the scope set. | |
| 987 debug_info->end_non_safepoint(pc_offset); | |
| 988 } | |
| 989 | |
| 990 | |
| 991 | |
| 992 // helper for Fill_buffer bailout logic | |
| 993 static void turn_off_compiler(Compile* C) { | |
| 994 if (CodeCache::unallocated_capacity() >= CodeCacheMinimumFreeSpace*10) { | |
| 995 // Do not turn off compilation if a single giant method has | |
| 996 // blown the code cache size. | |
| 997 C->record_failure("excessive request to CodeCache"); | |
| 998 } else { | |
| 28 | 999 // Let CompilerBroker disable further compilations. |
| 0 | 1000 C->record_failure("CodeCache is full"); |
| 1001 } | |
| 1002 } | |
| 1003 | |
| 1004 | |
| 1005 //------------------------------Fill_buffer------------------------------------ | |
| 1006 void Compile::Fill_buffer() { | |
| 1007 | |
| 1008 // Set the initially allocated size | |
| 1009 int code_req = initial_code_capacity; | |
| 1010 int locs_req = initial_locs_capacity; | |
| 1011 int stub_req = TraceJumps ? initial_stub_capacity * 10 : initial_stub_capacity; | |
| 1012 int const_req = initial_const_capacity; | |
| 1013 bool labels_not_set = true; | |
| 1014 | |
| 1015 int pad_req = NativeCall::instruction_size; | |
| 1016 // The extra spacing after the code is necessary on some platforms. | |
| 1017 // Sometimes we need to patch in a jump after the last instruction, | |
| 1018 // if the nmethod has been deoptimized. (See 4932387, 4894843.) | |
| 1019 | |
| 1020 uint i; | |
| 1021 // Compute the byte offset where we can store the deopt pc. | |
| 1022 if (fixed_slots() != 0) { | |
| 1023 _orig_pc_slot_offset_in_bytes = _regalloc->reg2offset(OptoReg::stack2reg(_orig_pc_slot)); | |
| 1024 } | |
| 1025 | |
| 1026 // Compute prolog code size | |
| 1027 _method_size = 0; | |
| 1028 _frame_slots = OptoReg::reg2stack(_matcher->_old_SP)+_regalloc->_framesize; | |
| 1029 #ifdef IA64 | |
| 1030 if (save_argument_registers()) { | |
| 1031 // 4815101: this is a stub with implicit and unknown precision fp args. | |
| 1032 // The usual spill mechanism can only generate stfd's in this case, which | |
| 1033 // doesn't work if the fp reg to spill contains a single-precision denorm. | |
| 1034 // Instead, we hack around the normal spill mechanism using stfspill's and | |
| 1035 // ldffill's in the MachProlog and MachEpilog emit methods. We allocate | |
| 1036 // space here for the fp arg regs (f8-f15) we're going to thusly spill. | |
| 1037 // | |
| 1038 // If we ever implement 16-byte 'registers' == stack slots, we can | |
| 1039 // get rid of this hack and have SpillCopy generate stfspill/ldffill | |
| 1040 // instead of stfd/stfs/ldfd/ldfs. | |
| 1041 _frame_slots += 8*(16/BytesPerInt); | |
| 1042 } | |
| 1043 #endif | |
| 1044 assert( _frame_slots >= 0 && _frame_slots < 1000000, "sanity check" ); | |
| 1045 | |
| 1046 // Create an array of unused labels, one for each basic block | |
| 1047 Label *blk_labels = NEW_RESOURCE_ARRAY(Label, _cfg->_num_blocks+1); | |
| 1048 | |
| 1049 for( i=0; i <= _cfg->_num_blocks; i++ ) { | |
| 1050 blk_labels[i].init(); | |
| 1051 } | |
| 1052 | |
| 1053 // If this machine supports different size branch offsets, then pre-compute | |
| 1054 // the length of the blocks | |
| 1055 if( _matcher->is_short_branch_offset(0) ) { | |
| 1056 Shorten_branches(blk_labels, code_req, locs_req, stub_req, const_req); | |
| 1057 labels_not_set = false; | |
| 1058 } | |
| 1059 | |
| 1060 // nmethod and CodeBuffer count stubs & constants as part of method's code. | |
| 1061 int exception_handler_req = size_exception_handler(); | |
| 1062 int deopt_handler_req = size_deopt_handler(); | |
| 1063 exception_handler_req += MAX_stubs_size; // add marginal slop for handler | |
| 1064 deopt_handler_req += MAX_stubs_size; // add marginal slop for handler | |
| 1065 stub_req += MAX_stubs_size; // ensure per-stub margin | |
| 1066 code_req += MAX_inst_size; // ensure per-instruction margin | |
| 1067 if (StressCodeBuffers) | |
| 1068 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion | |
| 1069 int total_req = code_req + pad_req + stub_req + exception_handler_req + deopt_handler_req + const_req; | |
| 1070 CodeBuffer* cb = code_buffer(); | |
| 1071 cb->initialize(total_req, locs_req); | |
| 1072 | |
| 1073 // Have we run out of code space? | |
| 1074 if (cb->blob() == NULL) { | |
| 1075 turn_off_compiler(this); | |
| 1076 return; | |
| 1077 } | |
| 1078 // Configure the code buffer. | |
| 1079 cb->initialize_consts_size(const_req); | |
| 1080 cb->initialize_stubs_size(stub_req); | |
| 1081 cb->initialize_oop_recorder(env()->oop_recorder()); | |
| 1082 | |
| 1083 // fill in the nop array for bundling computations | |
| 1084 MachNode *_nop_list[Bundle::_nop_count]; | |
| 1085 Bundle::initialize_nops(_nop_list, this); | |
| 1086 | |
| 1087 // Create oopmap set. | |
| 1088 _oop_map_set = new OopMapSet(); | |
| 1089 | |
| 1090 // !!!!! This preserves old handling of oopmaps for now | |
| 1091 debug_info()->set_oopmaps(_oop_map_set); | |
| 1092 | |
| 1093 // Count and start of implicit null check instructions | |
| 1094 uint inct_cnt = 0; | |
| 1095 uint *inct_starts = NEW_RESOURCE_ARRAY(uint, _cfg->_num_blocks+1); | |
| 1096 | |
| 1097 // Count and start of calls | |
| 1098 uint *call_returns = NEW_RESOURCE_ARRAY(uint, _cfg->_num_blocks+1); | |
| 1099 | |
| 1100 uint return_offset = 0; | |
| 1101 MachNode *nop = new (this) MachNopNode(); | |
| 1102 | |
| 1103 int previous_offset = 0; | |
| 1104 int current_offset = 0; | |
| 1105 int last_call_offset = -1; | |
| 1106 | |
| 1107 // Create an array of unused labels, one for each basic block, if printing is enabled | |
| 1108 #ifndef PRODUCT | |
| 1109 int *node_offsets = NULL; | |
| 1110 uint node_offset_limit = unique(); | |
| 1111 | |
| 1112 | |
| 1113 if ( print_assembly() ) | |
| 1114 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit); | |
| 1115 #endif | |
| 1116 | |
| 1117 NonSafepointEmitter non_safepoints(this); // emit non-safepoints lazily | |
| 1118 | |
| 1119 // ------------------ | |
| 1120 // Now fill in the code buffer | |
| 1121 Node *delay_slot = NULL; | |
| 1122 | |
| 1123 for( i=0; i < _cfg->_num_blocks; i++ ) { | |
| 1124 Block *b = _cfg->_blocks[i]; | |
| 1125 | |
| 1126 Node *head = b->head(); | |
| 1127 | |
| 1128 // If this block needs to start aligned (i.e, can be reached other | |
| 1129 // than by falling-thru from the previous block), then force the | |
| 1130 // start of a new bundle. | |
| 1131 if( Pipeline::requires_bundling() && starts_bundle(head) ) | |
| 1132 cb->flush_bundle(true); | |
| 1133 | |
| 1134 // Define the label at the beginning of the basic block | |
| 1135 if( labels_not_set ) | |
| 1136 MacroAssembler(cb).bind( blk_labels[b->_pre_order] ); | |
| 1137 | |
| 1138 else | |
| 1139 assert( blk_labels[b->_pre_order].loc_pos() == cb->code_size(), | |
| 1140 "label position does not match code offset" ); | |
| 1141 | |
| 1142 uint last_inst = b->_nodes.size(); | |
| 1143 | |
| 1144 // Emit block normally, except for last instruction. | |
| 1145 // Emit means "dump code bits into code buffer". | |
| 1146 for( uint j = 0; j<last_inst; j++ ) { | |
| 1147 | |
| 1148 // Get the node | |
| 1149 Node* n = b->_nodes[j]; | |
| 1150 | |
| 1151 // See if delay slots are supported | |
| 1152 if (valid_bundle_info(n) && | |
| 1153 node_bundling(n)->used_in_unconditional_delay()) { | |
| 1154 assert(delay_slot == NULL, "no use of delay slot node"); | |
| 1155 assert(n->size(_regalloc) == Pipeline::instr_unit_size(), "delay slot instruction wrong size"); | |
| 1156 | |
| 1157 delay_slot = n; | |
| 1158 continue; | |
| 1159 } | |
| 1160 | |
| 1161 // If this starts a new instruction group, then flush the current one | |
| 1162 // (but allow split bundles) | |
| 1163 if( Pipeline::requires_bundling() && starts_bundle(n) ) | |
| 1164 cb->flush_bundle(false); | |
| 1165 | |
| 1166 // The following logic is duplicated in the code ifdeffed for | |
| 1167 // ENABLE_ZAP_DEAD_LOCALS which apppears above in this file. It | |
| 1168 // should be factored out. Or maybe dispersed to the nodes? | |
| 1169 | |
| 1170 // Special handling for SafePoint/Call Nodes | |
| 1171 bool is_mcall = false; | |
| 1172 if( n->is_Mach() ) { | |
| 1173 MachNode *mach = n->as_Mach(); | |
| 1174 is_mcall = n->is_MachCall(); | |
| 1175 bool is_sfn = n->is_MachSafePoint(); | |
| 1176 | |
| 1177 // If this requires all previous instructions be flushed, then do so | |
| 1178 if( is_sfn || is_mcall || mach->alignment_required() != 1) { | |
| 1179 cb->flush_bundle(true); | |
| 1180 current_offset = cb->code_size(); | |
| 1181 } | |
| 1182 | |
| 1183 // align the instruction if necessary | |
| 1184 int nop_size = nop->size(_regalloc); | |
| 1185 int padding = mach->compute_padding(current_offset); | |
| 1186 // Make sure safepoint node for polling is distinct from a call's | |
| 1187 // return by adding a nop if needed. | |
| 1188 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset ) { | |
| 1189 padding = nop_size; | |
| 1190 } | |
| 1191 assert( labels_not_set || padding == 0, "instruction should already be aligned") | |
| 1192 | |
| 1193 if(padding > 0) { | |
| 1194 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size"); | |
| 1195 int nops_cnt = padding / nop_size; | |
| 1196 MachNode *nop = new (this) MachNopNode(nops_cnt); | |
| 1197 b->_nodes.insert(j++, nop); | |
| 1198 last_inst++; | |
| 1199 _cfg->_bbs.map( nop->_idx, b ); | |
| 1200 nop->emit(*cb, _regalloc); | |
| 1201 cb->flush_bundle(true); | |
| 1202 current_offset = cb->code_size(); | |
| 1203 } | |
| 1204 | |
| 1205 // Remember the start of the last call in a basic block | |
| 1206 if (is_mcall) { | |
| 1207 MachCallNode *mcall = mach->as_MachCall(); | |
| 1208 | |
| 1209 // This destination address is NOT PC-relative | |
| 1210 mcall->method_set((intptr_t)mcall->entry_point()); | |
| 1211 | |
| 1212 // Save the return address | |
| 1213 call_returns[b->_pre_order] = current_offset + mcall->ret_addr_offset(); | |
| 1214 | |
| 1215 if (!mcall->is_safepoint_node()) { | |
| 1216 is_mcall = false; | |
| 1217 is_sfn = false; | |
| 1218 } | |
| 1219 } | |
| 1220 | |
| 1221 // sfn will be valid whenever mcall is valid now because of inheritance | |
| 1222 if( is_sfn || is_mcall ) { | |
| 1223 | |
| 1224 // Handle special safepoint nodes for synchronization | |
| 1225 if( !is_mcall ) { | |
| 1226 MachSafePointNode *sfn = mach->as_MachSafePoint(); | |
| 1227 // !!!!! Stubs only need an oopmap right now, so bail out | |
| 1228 if( sfn->jvms()->method() == NULL) { | |
| 1229 // Write the oopmap directly to the code blob??!! | |
| 1230 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 1231 assert( !is_node_getting_a_safepoint(sfn), "logic does not match; false positive"); | |
| 1232 # endif | |
| 1233 continue; | |
| 1234 } | |
| 1235 } // End synchronization | |
| 1236 | |
| 1237 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
| 1238 current_offset); | |
| 1239 Process_OopMap_Node(mach, current_offset); | |
| 1240 } // End if safepoint | |
| 1241 | |
| 1242 // If this is a null check, then add the start of the previous instruction to the list | |
| 1243 else if( mach->is_MachNullCheck() ) { | |
| 1244 inct_starts[inct_cnt++] = previous_offset; | |
| 1245 } | |
| 1246 | |
| 1247 // If this is a branch, then fill in the label with the target BB's label | |
| 1248 else if ( mach->is_Branch() ) { | |
| 1249 | |
| 1250 if ( mach->ideal_Opcode() == Op_Jump ) { | |
| 1251 for (uint h = 0; h < b->_num_succs; h++ ) { | |
| 1252 Block* succs_block = b->_succs[h]; | |
| 1253 for (uint j = 1; j < succs_block->num_preds(); j++) { | |
| 1254 Node* jpn = succs_block->pred(j); | |
| 1255 if ( jpn->is_JumpProj() && jpn->in(0) == mach ) { | |
| 1256 uint block_num = succs_block->non_connector()->_pre_order; | |
| 1257 Label *blkLabel = &blk_labels[block_num]; | |
| 1258 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel); | |
| 1259 } | |
| 1260 } | |
| 1261 } | |
| 1262 } else { | |
| 1263 // For Branchs | |
| 1264 // This requires the TRUE branch target be in succs[0] | |
| 1265 uint block_num = b->non_connector_successor(0)->_pre_order; | |
| 1266 mach->label_set( blk_labels[block_num], block_num ); | |
| 1267 } | |
| 1268 } | |
| 1269 | |
| 1270 #ifdef ASSERT | |
| 1271 // Check that oop-store preceeds the card-mark | |
| 1272 else if( mach->ideal_Opcode() == Op_StoreCM ) { | |
| 1273 uint storeCM_idx = j; | |
| 1274 Node *oop_store = mach->in(mach->_cnt); // First precedence edge | |
| 1275 assert( oop_store != NULL, "storeCM expects a precedence edge"); | |
| 1276 uint i4; | |
| 1277 for( i4 = 0; i4 < last_inst; ++i4 ) { | |
| 1278 if( b->_nodes[i4] == oop_store ) break; | |
| 1279 } | |
| 1280 // Note: This test can provide a false failure if other precedence | |
| 1281 // edges have been added to the storeCMNode. | |
| 1282 assert( i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store"); | |
| 1283 } | |
| 1284 #endif | |
| 1285 | |
| 1286 else if( !n->is_Proj() ) { | |
| 1287 // Remember the begining of the previous instruction, in case | |
| 1288 // it's followed by a flag-kill and a null-check. Happens on | |
| 1289 // Intel all the time, with add-to-memory kind of opcodes. | |
| 1290 previous_offset = current_offset; | |
| 1291 } | |
| 1292 } | |
| 1293 | |
| 1294 // Verify that there is sufficient space remaining | |
| 1295 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size); | |
| 1296 if (cb->blob() == NULL) { | |
| 1297 turn_off_compiler(this); | |
| 1298 return; | |
| 1299 } | |
| 1300 | |
| 1301 // Save the offset for the listing | |
| 1302 #ifndef PRODUCT | |
| 1303 if( node_offsets && n->_idx < node_offset_limit ) | |
| 1304 node_offsets[n->_idx] = cb->code_size(); | |
| 1305 #endif | |
| 1306 | |
| 1307 // "Normal" instruction case | |
| 1308 n->emit(*cb, _regalloc); | |
| 1309 current_offset = cb->code_size(); | |
| 1310 non_safepoints.observe_instruction(n, current_offset); | |
| 1311 | |
| 1312 // mcall is last "call" that can be a safepoint | |
| 1313 // record it so we can see if a poll will directly follow it | |
| 1314 // in which case we'll need a pad to make the PcDesc sites unique | |
| 1315 // see 5010568. This can be slightly inaccurate but conservative | |
| 1316 // in the case that return address is not actually at current_offset. | |
| 1317 // This is a small price to pay. | |
| 1318 | |
| 1319 if (is_mcall) { | |
| 1320 last_call_offset = current_offset; | |
| 1321 } | |
| 1322 | |
| 1323 // See if this instruction has a delay slot | |
| 1324 if ( valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { | |
| 1325 assert(delay_slot != NULL, "expecting delay slot node"); | |
| 1326 | |
| 1327 // Back up 1 instruction | |
| 1328 cb->set_code_end( | |
| 1329 cb->code_end()-Pipeline::instr_unit_size()); | |
| 1330 | |
| 1331 // Save the offset for the listing | |
| 1332 #ifndef PRODUCT | |
| 1333 if( node_offsets && delay_slot->_idx < node_offset_limit ) | |
| 1334 node_offsets[delay_slot->_idx] = cb->code_size(); | |
| 1335 #endif | |
| 1336 | |
| 1337 // Support a SafePoint in the delay slot | |
| 1338 if( delay_slot->is_MachSafePoint() ) { | |
| 1339 MachNode *mach = delay_slot->as_Mach(); | |
| 1340 // !!!!! Stubs only need an oopmap right now, so bail out | |
| 1341 if( !mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL ) { | |
| 1342 // Write the oopmap directly to the code blob??!! | |
| 1343 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 1344 assert( !is_node_getting_a_safepoint(mach), "logic does not match; false positive"); | |
| 1345 # endif | |
| 1346 delay_slot = NULL; | |
| 1347 continue; | |
| 1348 } | |
| 1349 | |
| 1350 int adjusted_offset = current_offset - Pipeline::instr_unit_size(); | |
| 1351 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(), | |
| 1352 adjusted_offset); | |
| 1353 // Generate an OopMap entry | |
| 1354 Process_OopMap_Node(mach, adjusted_offset); | |
| 1355 } | |
| 1356 | |
| 1357 // Insert the delay slot instruction | |
| 1358 delay_slot->emit(*cb, _regalloc); | |
| 1359 | |
| 1360 // Don't reuse it | |
| 1361 delay_slot = NULL; | |
| 1362 } | |
| 1363 | |
| 1364 } // End for all instructions in block | |
| 1365 | |
| 1366 // If the next block _starts_ a loop, pad this block out to align | |
| 1367 // the loop start a little. Helps prevent pipe stalls at loop starts | |
| 1368 int nop_size = (new (this) MachNopNode())->size(_regalloc); | |
| 1369 if( i<_cfg->_num_blocks-1 ) { | |
| 1370 Block *nb = _cfg->_blocks[i+1]; | |
| 1371 uint padding = nb->alignment_padding(current_offset); | |
| 1372 if( padding > 0 ) { | |
| 1373 MachNode *nop = new (this) MachNopNode(padding / nop_size); | |
| 1374 b->_nodes.insert( b->_nodes.size(), nop ); | |
| 1375 _cfg->_bbs.map( nop->_idx, b ); | |
| 1376 nop->emit(*cb, _regalloc); | |
| 1377 current_offset = cb->code_size(); | |
| 1378 } | |
| 1379 } | |
| 1380 | |
| 1381 } // End of for all blocks | |
| 1382 | |
| 1383 non_safepoints.flush_at_end(); | |
| 1384 | |
| 1385 // Offset too large? | |
| 1386 if (failing()) return; | |
| 1387 | |
| 1388 // Define a pseudo-label at the end of the code | |
| 1389 MacroAssembler(cb).bind( blk_labels[_cfg->_num_blocks] ); | |
| 1390 | |
| 1391 // Compute the size of the first block | |
| 1392 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos(); | |
| 1393 | |
| 1394 assert(cb->code_size() < 500000, "method is unreasonably large"); | |
| 1395 | |
| 1396 // ------------------ | |
| 1397 | |
| 1398 #ifndef PRODUCT | |
| 1399 // Information on the size of the method, without the extraneous code | |
| 1400 Scheduling::increment_method_size(cb->code_size()); | |
| 1401 #endif | |
| 1402 | |
| 1403 // ------------------ | |
| 1404 // Fill in exception table entries. | |
| 1405 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels); | |
| 1406 | |
| 1407 // Only java methods have exception handlers and deopt handlers | |
| 1408 if (_method) { | |
| 1409 // Emit the exception handler code. | |
| 1410 _code_offsets.set_value(CodeOffsets::Exceptions, emit_exception_handler(*cb)); | |
| 1411 // Emit the deopt handler code. | |
| 1412 _code_offsets.set_value(CodeOffsets::Deopt, emit_deopt_handler(*cb)); | |
| 1413 } | |
| 1414 | |
| 1415 // One last check for failed CodeBuffer::expand: | |
| 1416 if (cb->blob() == NULL) { | |
| 1417 turn_off_compiler(this); | |
| 1418 return; | |
| 1419 } | |
| 1420 | |
| 1421 #ifndef PRODUCT | |
| 1422 // Dump the assembly code, including basic-block numbers | |
| 1423 if (print_assembly()) { | |
| 1424 ttyLocker ttyl; // keep the following output all in one block | |
| 1425 if (!VMThread::should_terminate()) { // test this under the tty lock | |
| 1426 // This output goes directly to the tty, not the compiler log. | |
| 1427 // To enable tools to match it up with the compilation activity, | |
| 1428 // be sure to tag this tty output with the compile ID. | |
| 1429 if (xtty != NULL) { | |
| 1430 xtty->head("opto_assembly compile_id='%d'%s", compile_id(), | |
| 1431 is_osr_compilation() ? " compile_kind='osr'" : | |
| 1432 ""); | |
| 1433 } | |
| 1434 if (method() != NULL) { | |
| 1435 method()->print_oop(); | |
| 1436 print_codes(); | |
| 1437 } | |
| 1438 dump_asm(node_offsets, node_offset_limit); | |
| 1439 if (xtty != NULL) { | |
| 1440 xtty->tail("opto_assembly"); | |
| 1441 } | |
| 1442 } | |
| 1443 } | |
| 1444 #endif | |
| 1445 | |
| 1446 } | |
| 1447 | |
| 1448 void Compile::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) { | |
| 1449 _inc_table.set_size(cnt); | |
| 1450 | |
| 1451 uint inct_cnt = 0; | |
| 1452 for( uint i=0; i<_cfg->_num_blocks; i++ ) { | |
| 1453 Block *b = _cfg->_blocks[i]; | |
| 1454 Node *n = NULL; | |
| 1455 int j; | |
| 1456 | |
| 1457 // Find the branch; ignore trailing NOPs. | |
| 1458 for( j = b->_nodes.size()-1; j>=0; j-- ) { | |
| 1459 n = b->_nodes[j]; | |
| 1460 if( !n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con ) | |
| 1461 break; | |
| 1462 } | |
| 1463 | |
| 1464 // If we didn't find anything, continue | |
| 1465 if( j < 0 ) continue; | |
| 1466 | |
| 1467 // Compute ExceptionHandlerTable subtable entry and add it | |
| 1468 // (skip empty blocks) | |
| 1469 if( n->is_Catch() ) { | |
| 1470 | |
| 1471 // Get the offset of the return from the call | |
| 1472 uint call_return = call_returns[b->_pre_order]; | |
| 1473 #ifdef ASSERT | |
| 1474 assert( call_return > 0, "no call seen for this basic block" ); | |
| 1475 while( b->_nodes[--j]->Opcode() == Op_MachProj ) ; | |
| 1476 assert( b->_nodes[j]->is_Call(), "CatchProj must follow call" ); | |
| 1477 #endif | |
| 1478 // last instruction is a CatchNode, find it's CatchProjNodes | |
| 1479 int nof_succs = b->_num_succs; | |
| 1480 // allocate space | |
| 1481 GrowableArray<intptr_t> handler_bcis(nof_succs); | |
| 1482 GrowableArray<intptr_t> handler_pcos(nof_succs); | |
| 1483 // iterate through all successors | |
| 1484 for (int j = 0; j < nof_succs; j++) { | |
| 1485 Block* s = b->_succs[j]; | |
| 1486 bool found_p = false; | |
| 1487 for( uint k = 1; k < s->num_preds(); k++ ) { | |
| 1488 Node *pk = s->pred(k); | |
| 1489 if( pk->is_CatchProj() && pk->in(0) == n ) { | |
| 1490 const CatchProjNode* p = pk->as_CatchProj(); | |
| 1491 found_p = true; | |
| 1492 // add the corresponding handler bci & pco information | |
| 1493 if( p->_con != CatchProjNode::fall_through_index ) { | |
| 1494 // p leads to an exception handler (and is not fall through) | |
| 1495 assert(s == _cfg->_blocks[s->_pre_order],"bad numbering"); | |
| 1496 // no duplicates, please | |
| 1497 if( !handler_bcis.contains(p->handler_bci()) ) { | |
| 1498 uint block_num = s->non_connector()->_pre_order; | |
| 1499 handler_bcis.append(p->handler_bci()); | |
| 1500 handler_pcos.append(blk_labels[block_num].loc_pos()); | |
| 1501 } | |
| 1502 } | |
| 1503 } | |
| 1504 } | |
| 1505 assert(found_p, "no matching predecessor found"); | |
| 1506 // Note: Due to empty block removal, one block may have | |
| 1507 // several CatchProj inputs, from the same Catch. | |
| 1508 } | |
| 1509 | |
| 1510 // Set the offset of the return from the call | |
| 1511 _handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos); | |
| 1512 continue; | |
| 1513 } | |
| 1514 | |
| 1515 // Handle implicit null exception table updates | |
| 1516 if( n->is_MachNullCheck() ) { | |
| 1517 uint block_num = b->non_connector_successor(0)->_pre_order; | |
| 1518 _inc_table.append( inct_starts[inct_cnt++], blk_labels[block_num].loc_pos() ); | |
| 1519 continue; | |
| 1520 } | |
| 1521 } // End of for all blocks fill in exception table entries | |
| 1522 } | |
| 1523 | |
| 1524 // Static Variables | |
| 1525 #ifndef PRODUCT | |
| 1526 uint Scheduling::_total_nop_size = 0; | |
| 1527 uint Scheduling::_total_method_size = 0; | |
| 1528 uint Scheduling::_total_branches = 0; | |
| 1529 uint Scheduling::_total_unconditional_delays = 0; | |
| 1530 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1]; | |
| 1531 #endif | |
| 1532 | |
| 1533 // Initializer for class Scheduling | |
| 1534 | |
| 1535 Scheduling::Scheduling(Arena *arena, Compile &compile) | |
| 1536 : _arena(arena), | |
| 1537 _cfg(compile.cfg()), | |
| 1538 _bbs(compile.cfg()->_bbs), | |
| 1539 _regalloc(compile.regalloc()), | |
| 1540 _reg_node(arena), | |
| 1541 _bundle_instr_count(0), | |
| 1542 _bundle_cycle_number(0), | |
| 1543 _scheduled(arena), | |
| 1544 _available(arena), | |
| 1545 _next_node(NULL), | |
| 1546 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0]), | |
| 1547 _pinch_free_list(arena) | |
| 1548 #ifndef PRODUCT | |
| 1549 , _branches(0) | |
| 1550 , _unconditional_delays(0) | |
| 1551 #endif | |
| 1552 { | |
| 1553 // Create a MachNopNode | |
| 1554 _nop = new (&compile) MachNopNode(); | |
| 1555 | |
| 1556 // Now that the nops are in the array, save the count | |
| 1557 // (but allow entries for the nops) | |
| 1558 _node_bundling_limit = compile.unique(); | |
| 1559 uint node_max = _regalloc->node_regs_max_index(); | |
| 1560 | |
| 1561 compile.set_node_bundling_limit(_node_bundling_limit); | |
| 1562 | |
| 1563 // This one is persistant within the Compile class | |
| 1564 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max); | |
| 1565 | |
| 1566 // Allocate space for fixed-size arrays | |
| 1567 _node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
| 1568 _uses = NEW_ARENA_ARRAY(arena, short, node_max); | |
| 1569 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max); | |
| 1570 | |
| 1571 // Clear the arrays | |
| 1572 memset(_node_bundling_base, 0, node_max * sizeof(Bundle)); | |
| 1573 memset(_node_latency, 0, node_max * sizeof(unsigned short)); | |
| 1574 memset(_uses, 0, node_max * sizeof(short)); | |
| 1575 memset(_current_latency, 0, node_max * sizeof(unsigned short)); | |
| 1576 | |
| 1577 // Clear the bundling information | |
| 1578 memcpy(_bundle_use_elements, | |
| 1579 Pipeline_Use::elaborated_elements, | |
| 1580 sizeof(Pipeline_Use::elaborated_elements)); | |
| 1581 | |
| 1582 // Get the last node | |
| 1583 Block *bb = _cfg->_blocks[_cfg->_blocks.size()-1]; | |
| 1584 | |
| 1585 _next_node = bb->_nodes[bb->_nodes.size()-1]; | |
| 1586 } | |
| 1587 | |
| 1588 #ifndef PRODUCT | |
| 1589 // Scheduling destructor | |
| 1590 Scheduling::~Scheduling() { | |
| 1591 _total_branches += _branches; | |
| 1592 _total_unconditional_delays += _unconditional_delays; | |
| 1593 } | |
| 1594 #endif | |
| 1595 | |
| 1596 // Step ahead "i" cycles | |
| 1597 void Scheduling::step(uint i) { | |
| 1598 | |
| 1599 Bundle *bundle = node_bundling(_next_node); | |
| 1600 bundle->set_starts_bundle(); | |
| 1601 | |
| 1602 // Update the bundle record, but leave the flags information alone | |
| 1603 if (_bundle_instr_count > 0) { | |
| 1604 bundle->set_instr_count(_bundle_instr_count); | |
| 1605 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
| 1606 } | |
| 1607 | |
| 1608 // Update the state information | |
| 1609 _bundle_instr_count = 0; | |
| 1610 _bundle_cycle_number += i; | |
| 1611 _bundle_use.step(i); | |
| 1612 } | |
| 1613 | |
| 1614 void Scheduling::step_and_clear() { | |
| 1615 Bundle *bundle = node_bundling(_next_node); | |
| 1616 bundle->set_starts_bundle(); | |
| 1617 | |
| 1618 // Update the bundle record | |
| 1619 if (_bundle_instr_count > 0) { | |
| 1620 bundle->set_instr_count(_bundle_instr_count); | |
| 1621 bundle->set_resources_used(_bundle_use.resourcesUsed()); | |
| 1622 | |
| 1623 _bundle_cycle_number += 1; | |
| 1624 } | |
| 1625 | |
| 1626 // Clear the bundling information | |
| 1627 _bundle_instr_count = 0; | |
| 1628 _bundle_use.reset(); | |
| 1629 | |
| 1630 memcpy(_bundle_use_elements, | |
| 1631 Pipeline_Use::elaborated_elements, | |
| 1632 sizeof(Pipeline_Use::elaborated_elements)); | |
| 1633 } | |
| 1634 | |
| 1635 //------------------------------ScheduleAndBundle------------------------------ | |
| 1636 // Perform instruction scheduling and bundling over the sequence of | |
| 1637 // instructions in backwards order. | |
| 1638 void Compile::ScheduleAndBundle() { | |
| 1639 | |
| 1640 // Don't optimize this if it isn't a method | |
| 1641 if (!_method) | |
| 1642 return; | |
| 1643 | |
| 1644 // Don't optimize this if scheduling is disabled | |
| 1645 if (!do_scheduling()) | |
| 1646 return; | |
| 1647 | |
| 1648 NOT_PRODUCT( TracePhase t2("isched", &_t_instrSched, TimeCompiler); ) | |
| 1649 | |
| 1650 // Create a data structure for all the scheduling information | |
| 1651 Scheduling scheduling(Thread::current()->resource_area(), *this); | |
| 1652 | |
| 1653 // Walk backwards over each basic block, computing the needed alignment | |
| 1654 // Walk over all the basic blocks | |
| 1655 scheduling.DoScheduling(); | |
| 1656 } | |
| 1657 | |
| 1658 //------------------------------ComputeLocalLatenciesForward------------------- | |
| 1659 // Compute the latency of all the instructions. This is fairly simple, | |
| 1660 // because we already have a legal ordering. Walk over the instructions | |
| 1661 // from first to last, and compute the latency of the instruction based | |
| 1662 // on the latency of the preceeding instruction(s). | |
| 1663 void Scheduling::ComputeLocalLatenciesForward(const Block *bb) { | |
| 1664 #ifndef PRODUCT | |
| 1665 if (_cfg->C->trace_opto_output()) | |
| 1666 tty->print("# -> ComputeLocalLatenciesForward\n"); | |
| 1667 #endif | |
| 1668 | |
| 1669 // Walk over all the schedulable instructions | |
| 1670 for( uint j=_bb_start; j < _bb_end; j++ ) { | |
| 1671 | |
| 1672 // This is a kludge, forcing all latency calculations to start at 1. | |
| 1673 // Used to allow latency 0 to force an instruction to the beginning | |
| 1674 // of the bb | |
| 1675 uint latency = 1; | |
| 1676 Node *use = bb->_nodes[j]; | |
| 1677 uint nlen = use->len(); | |
| 1678 | |
| 1679 // Walk over all the inputs | |
| 1680 for ( uint k=0; k < nlen; k++ ) { | |
| 1681 Node *def = use->in(k); | |
| 1682 if (!def) | |
| 1683 continue; | |
| 1684 | |
| 1685 uint l = _node_latency[def->_idx] + use->latency(k); | |
| 1686 if (latency < l) | |
| 1687 latency = l; | |
| 1688 } | |
| 1689 | |
| 1690 _node_latency[use->_idx] = latency; | |
| 1691 | |
| 1692 #ifndef PRODUCT | |
| 1693 if (_cfg->C->trace_opto_output()) { | |
| 1694 tty->print("# latency %4d: ", latency); | |
| 1695 use->dump(); | |
| 1696 } | |
| 1697 #endif | |
| 1698 } | |
| 1699 | |
| 1700 #ifndef PRODUCT | |
| 1701 if (_cfg->C->trace_opto_output()) | |
| 1702 tty->print("# <- ComputeLocalLatenciesForward\n"); | |
| 1703 #endif | |
| 1704 | |
| 1705 } // end ComputeLocalLatenciesForward | |
| 1706 | |
| 1707 // See if this node fits into the present instruction bundle | |
| 1708 bool Scheduling::NodeFitsInBundle(Node *n) { | |
| 1709 uint n_idx = n->_idx; | |
| 1710 | |
| 1711 // If this is the unconditional delay instruction, then it fits | |
| 1712 if (n == _unconditional_delay_slot) { | |
| 1713 #ifndef PRODUCT | |
| 1714 if (_cfg->C->trace_opto_output()) | |
| 1715 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx); | |
| 1716 #endif | |
| 1717 return (true); | |
| 1718 } | |
| 1719 | |
| 1720 // If the node cannot be scheduled this cycle, skip it | |
| 1721 if (_current_latency[n_idx] > _bundle_cycle_number) { | |
| 1722 #ifndef PRODUCT | |
| 1723 if (_cfg->C->trace_opto_output()) | |
| 1724 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n", | |
| 1725 n->_idx, _current_latency[n_idx], _bundle_cycle_number); | |
| 1726 #endif | |
| 1727 return (false); | |
| 1728 } | |
| 1729 | |
| 1730 const Pipeline *node_pipeline = n->pipeline(); | |
| 1731 | |
| 1732 uint instruction_count = node_pipeline->instructionCount(); | |
| 1733 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
| 1734 instruction_count = 0; | |
| 1735 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
| 1736 instruction_count++; | |
| 1737 | |
| 1738 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) { | |
| 1739 #ifndef PRODUCT | |
| 1740 if (_cfg->C->trace_opto_output()) | |
| 1741 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n", | |
| 1742 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle); | |
| 1743 #endif | |
| 1744 return (false); | |
| 1745 } | |
| 1746 | |
| 1747 // Don't allow non-machine nodes to be handled this way | |
| 1748 if (!n->is_Mach() && instruction_count == 0) | |
| 1749 return (false); | |
| 1750 | |
| 1751 // See if there is any overlap | |
| 1752 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse()); | |
| 1753 | |
| 1754 if (delay > 0) { | |
| 1755 #ifndef PRODUCT | |
| 1756 if (_cfg->C->trace_opto_output()) | |
| 1757 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx); | |
| 1758 #endif | |
| 1759 return false; | |
| 1760 } | |
| 1761 | |
| 1762 #ifndef PRODUCT | |
| 1763 if (_cfg->C->trace_opto_output()) | |
| 1764 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx); | |
| 1765 #endif | |
| 1766 | |
| 1767 return true; | |
| 1768 } | |
| 1769 | |
| 1770 Node * Scheduling::ChooseNodeToBundle() { | |
| 1771 uint siz = _available.size(); | |
| 1772 | |
| 1773 if (siz == 0) { | |
| 1774 | |
| 1775 #ifndef PRODUCT | |
| 1776 if (_cfg->C->trace_opto_output()) | |
| 1777 tty->print("# ChooseNodeToBundle: NULL\n"); | |
| 1778 #endif | |
| 1779 return (NULL); | |
| 1780 } | |
| 1781 | |
| 1782 // Fast path, if only 1 instruction in the bundle | |
| 1783 if (siz == 1) { | |
| 1784 #ifndef PRODUCT | |
| 1785 if (_cfg->C->trace_opto_output()) { | |
| 1786 tty->print("# ChooseNodeToBundle (only 1): "); | |
| 1787 _available[0]->dump(); | |
| 1788 } | |
| 1789 #endif | |
| 1790 return (_available[0]); | |
| 1791 } | |
| 1792 | |
| 1793 // Don't bother, if the bundle is already full | |
| 1794 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) { | |
| 1795 for ( uint i = 0; i < siz; i++ ) { | |
| 1796 Node *n = _available[i]; | |
| 1797 | |
| 1798 // Skip projections, we'll handle them another way | |
| 1799 if (n->is_Proj()) | |
| 1800 continue; | |
| 1801 | |
| 1802 // This presupposed that instructions are inserted into the | |
| 1803 // available list in a legality order; i.e. instructions that | |
| 1804 // must be inserted first are at the head of the list | |
| 1805 if (NodeFitsInBundle(n)) { | |
| 1806 #ifndef PRODUCT | |
| 1807 if (_cfg->C->trace_opto_output()) { | |
| 1808 tty->print("# ChooseNodeToBundle: "); | |
| 1809 n->dump(); | |
| 1810 } | |
| 1811 #endif | |
| 1812 return (n); | |
| 1813 } | |
| 1814 } | |
| 1815 } | |
| 1816 | |
| 1817 // Nothing fits in this bundle, choose the highest priority | |
| 1818 #ifndef PRODUCT | |
| 1819 if (_cfg->C->trace_opto_output()) { | |
| 1820 tty->print("# ChooseNodeToBundle: "); | |
| 1821 _available[0]->dump(); | |
| 1822 } | |
| 1823 #endif | |
| 1824 | |
| 1825 return _available[0]; | |
| 1826 } | |
| 1827 | |
| 1828 //------------------------------AddNodeToAvailableList------------------------- | |
| 1829 void Scheduling::AddNodeToAvailableList(Node *n) { | |
| 1830 assert( !n->is_Proj(), "projections never directly made available" ); | |
| 1831 #ifndef PRODUCT | |
| 1832 if (_cfg->C->trace_opto_output()) { | |
| 1833 tty->print("# AddNodeToAvailableList: "); | |
| 1834 n->dump(); | |
| 1835 } | |
| 1836 #endif | |
| 1837 | |
| 1838 int latency = _current_latency[n->_idx]; | |
| 1839 | |
| 1840 // Insert in latency order (insertion sort) | |
| 1841 uint i; | |
| 1842 for ( i=0; i < _available.size(); i++ ) | |
| 1843 if (_current_latency[_available[i]->_idx] > latency) | |
| 1844 break; | |
| 1845 | |
| 1846 // Special Check for compares following branches | |
| 1847 if( n->is_Mach() && _scheduled.size() > 0 ) { | |
| 1848 int op = n->as_Mach()->ideal_Opcode(); | |
| 1849 Node *last = _scheduled[0]; | |
| 1850 if( last->is_MachIf() && last->in(1) == n && | |
| 1851 ( op == Op_CmpI || | |
| 1852 op == Op_CmpU || | |
| 1853 op == Op_CmpP || | |
| 1854 op == Op_CmpF || | |
| 1855 op == Op_CmpD || | |
| 1856 op == Op_CmpL ) ) { | |
| 1857 | |
| 1858 // Recalculate position, moving to front of same latency | |
| 1859 for ( i=0 ; i < _available.size(); i++ ) | |
| 1860 if (_current_latency[_available[i]->_idx] >= latency) | |
| 1861 break; | |
| 1862 } | |
| 1863 } | |
| 1864 | |
| 1865 // Insert the node in the available list | |
| 1866 _available.insert(i, n); | |
| 1867 | |
| 1868 #ifndef PRODUCT | |
| 1869 if (_cfg->C->trace_opto_output()) | |
| 1870 dump_available(); | |
| 1871 #endif | |
| 1872 } | |
| 1873 | |
| 1874 //------------------------------DecrementUseCounts----------------------------- | |
| 1875 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) { | |
| 1876 for ( uint i=0; i < n->len(); i++ ) { | |
| 1877 Node *def = n->in(i); | |
| 1878 if (!def) continue; | |
| 1879 if( def->is_Proj() ) // If this is a machine projection, then | |
| 1880 def = def->in(0); // propagate usage thru to the base instruction | |
| 1881 | |
| 1882 if( _bbs[def->_idx] != bb ) // Ignore if not block-local | |
| 1883 continue; | |
| 1884 | |
| 1885 // Compute the latency | |
| 1886 uint l = _bundle_cycle_number + n->latency(i); | |
| 1887 if (_current_latency[def->_idx] < l) | |
| 1888 _current_latency[def->_idx] = l; | |
| 1889 | |
| 1890 // If this does not have uses then schedule it | |
| 1891 if ((--_uses[def->_idx]) == 0) | |
| 1892 AddNodeToAvailableList(def); | |
| 1893 } | |
| 1894 } | |
| 1895 | |
| 1896 //------------------------------AddNodeToBundle-------------------------------- | |
| 1897 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) { | |
| 1898 #ifndef PRODUCT | |
| 1899 if (_cfg->C->trace_opto_output()) { | |
| 1900 tty->print("# AddNodeToBundle: "); | |
| 1901 n->dump(); | |
| 1902 } | |
| 1903 #endif | |
| 1904 | |
| 1905 // Remove this from the available list | |
| 1906 uint i; | |
| 1907 for (i = 0; i < _available.size(); i++) | |
| 1908 if (_available[i] == n) | |
| 1909 break; | |
| 1910 assert(i < _available.size(), "entry in _available list not found"); | |
| 1911 _available.remove(i); | |
| 1912 | |
| 1913 // See if this fits in the current bundle | |
| 1914 const Pipeline *node_pipeline = n->pipeline(); | |
| 1915 const Pipeline_Use& node_usage = node_pipeline->resourceUse(); | |
| 1916 | |
| 1917 // Check for instructions to be placed in the delay slot. We | |
| 1918 // do this before we actually schedule the current instruction, | |
| 1919 // because the delay slot follows the current instruction. | |
| 1920 if (Pipeline::_branch_has_delay_slot && | |
| 1921 node_pipeline->hasBranchDelay() && | |
| 1922 !_unconditional_delay_slot) { | |
| 1923 | |
| 1924 uint siz = _available.size(); | |
| 1925 | |
| 1926 // Conditional branches can support an instruction that | |
| 1927 // is unconditionally executed and not dependant by the | |
| 1928 // branch, OR a conditionally executed instruction if | |
| 1929 // the branch is taken. In practice, this means that | |
| 1930 // the first instruction at the branch target is | |
| 1931 // copied to the delay slot, and the branch goes to | |
| 1932 // the instruction after that at the branch target | |
| 1933 if ( n->is_Mach() && n->is_Branch() ) { | |
| 1934 | |
| 1935 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" ); | |
| 1936 assert( !n->is_Catch(), "should not look for delay slot for Catch" ); | |
| 1937 | |
| 1938 #ifndef PRODUCT | |
| 1939 _branches++; | |
| 1940 #endif | |
| 1941 | |
| 1942 // At least 1 instruction is on the available list | |
| 1943 // that is not dependant on the branch | |
| 1944 for (uint i = 0; i < siz; i++) { | |
| 1945 Node *d = _available[i]; | |
| 1946 const Pipeline *avail_pipeline = d->pipeline(); | |
| 1947 | |
| 1948 // Don't allow safepoints in the branch shadow, that will | |
| 1949 // cause a number of difficulties | |
| 1950 if ( avail_pipeline->instructionCount() == 1 && | |
| 1951 !avail_pipeline->hasMultipleBundles() && | |
| 1952 !avail_pipeline->hasBranchDelay() && | |
| 1953 Pipeline::instr_has_unit_size() && | |
| 1954 d->size(_regalloc) == Pipeline::instr_unit_size() && | |
| 1955 NodeFitsInBundle(d) && | |
| 1956 !node_bundling(d)->used_in_delay()) { | |
| 1957 | |
| 1958 if (d->is_Mach() && !d->is_MachSafePoint()) { | |
| 1959 // A node that fits in the delay slot was found, so we need to | |
| 1960 // set the appropriate bits in the bundle pipeline information so | |
| 1961 // that it correctly indicates resource usage. Later, when we | |
| 1962 // attempt to add this instruction to the bundle, we will skip | |
| 1963 // setting the resource usage. | |
| 1964 _unconditional_delay_slot = d; | |
| 1965 node_bundling(n)->set_use_unconditional_delay(); | |
| 1966 node_bundling(d)->set_used_in_unconditional_delay(); | |
| 1967 _bundle_use.add_usage(avail_pipeline->resourceUse()); | |
| 1968 _current_latency[d->_idx] = _bundle_cycle_number; | |
| 1969 _next_node = d; | |
| 1970 ++_bundle_instr_count; | |
| 1971 #ifndef PRODUCT | |
| 1972 _unconditional_delays++; | |
| 1973 #endif | |
| 1974 break; | |
| 1975 } | |
| 1976 } | |
| 1977 } | |
| 1978 } | |
| 1979 | |
| 1980 // No delay slot, add a nop to the usage | |
| 1981 if (!_unconditional_delay_slot) { | |
| 1982 // See if adding an instruction in the delay slot will overflow | |
| 1983 // the bundle. | |
| 1984 if (!NodeFitsInBundle(_nop)) { | |
| 1985 #ifndef PRODUCT | |
| 1986 if (_cfg->C->trace_opto_output()) | |
| 1987 tty->print("# *** STEP(1 instruction for delay slot) ***\n"); | |
| 1988 #endif | |
| 1989 step(1); | |
| 1990 } | |
| 1991 | |
| 1992 _bundle_use.add_usage(_nop->pipeline()->resourceUse()); | |
| 1993 _next_node = _nop; | |
| 1994 ++_bundle_instr_count; | |
| 1995 } | |
| 1996 | |
| 1997 // See if the instruction in the delay slot requires a | |
| 1998 // step of the bundles | |
| 1999 if (!NodeFitsInBundle(n)) { | |
| 2000 #ifndef PRODUCT | |
| 2001 if (_cfg->C->trace_opto_output()) | |
| 2002 tty->print("# *** STEP(branch won't fit) ***\n"); | |
| 2003 #endif | |
| 2004 // Update the state information | |
| 2005 _bundle_instr_count = 0; | |
| 2006 _bundle_cycle_number += 1; | |
| 2007 _bundle_use.step(1); | |
| 2008 } | |
| 2009 } | |
| 2010 | |
| 2011 // Get the number of instructions | |
| 2012 uint instruction_count = node_pipeline->instructionCount(); | |
| 2013 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0) | |
| 2014 instruction_count = 0; | |
| 2015 | |
| 2016 // Compute the latency information | |
| 2017 uint delay = 0; | |
| 2018 | |
| 2019 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) { | |
| 2020 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number; | |
| 2021 if (relative_latency < 0) | |
| 2022 relative_latency = 0; | |
| 2023 | |
| 2024 delay = _bundle_use.full_latency(relative_latency, node_usage); | |
| 2025 | |
| 2026 // Does not fit in this bundle, start a new one | |
| 2027 if (delay > 0) { | |
| 2028 step(delay); | |
| 2029 | |
| 2030 #ifndef PRODUCT | |
| 2031 if (_cfg->C->trace_opto_output()) | |
| 2032 tty->print("# *** STEP(%d) ***\n", delay); | |
| 2033 #endif | |
| 2034 } | |
| 2035 } | |
| 2036 | |
| 2037 // If this was placed in the delay slot, ignore it | |
| 2038 if (n != _unconditional_delay_slot) { | |
| 2039 | |
| 2040 if (delay == 0) { | |
| 2041 if (node_pipeline->hasMultipleBundles()) { | |
| 2042 #ifndef PRODUCT | |
| 2043 if (_cfg->C->trace_opto_output()) | |
| 2044 tty->print("# *** STEP(multiple instructions) ***\n"); | |
| 2045 #endif | |
| 2046 step(1); | |
| 2047 } | |
| 2048 | |
| 2049 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) { | |
| 2050 #ifndef PRODUCT | |
| 2051 if (_cfg->C->trace_opto_output()) | |
| 2052 tty->print("# *** STEP(%d >= %d instructions) ***\n", | |
| 2053 instruction_count + _bundle_instr_count, | |
| 2054 Pipeline::_max_instrs_per_cycle); | |
| 2055 #endif | |
| 2056 step(1); | |
| 2057 } | |
| 2058 } | |
| 2059 | |
| 2060 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot) | |
| 2061 _bundle_instr_count++; | |
| 2062 | |
| 2063 // Set the node's latency | |
| 2064 _current_latency[n->_idx] = _bundle_cycle_number; | |
| 2065 | |
| 2066 // Now merge the functional unit information | |
| 2067 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) | |
| 2068 _bundle_use.add_usage(node_usage); | |
| 2069 | |
| 2070 // Increment the number of instructions in this bundle | |
| 2071 _bundle_instr_count += instruction_count; | |
| 2072 | |
| 2073 // Remember this node for later | |
| 2074 if (n->is_Mach()) | |
| 2075 _next_node = n; | |
| 2076 } | |
| 2077 | |
| 2078 // It's possible to have a BoxLock in the graph and in the _bbs mapping but | |
| 2079 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks. | |
| 2080 // 'Schedule' them (basically ignore in the schedule) but do not insert them | |
| 2081 // into the block. All other scheduled nodes get put in the schedule here. | |
| 2082 int op = n->Opcode(); | |
| 2083 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR | |
| 2084 (op != Op_Node && // Not an unused antidepedence node and | |
| 2085 // not an unallocated boxlock | |
| 2086 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) { | |
| 2087 | |
| 2088 // Push any trailing projections | |
| 2089 if( bb->_nodes[bb->_nodes.size()-1] != n ) { | |
| 2090 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 2091 Node *foi = n->fast_out(i); | |
| 2092 if( foi->is_Proj() ) | |
| 2093 _scheduled.push(foi); | |
| 2094 } | |
| 2095 } | |
| 2096 | |
| 2097 // Put the instruction in the schedule list | |
| 2098 _scheduled.push(n); | |
| 2099 } | |
| 2100 | |
| 2101 #ifndef PRODUCT | |
| 2102 if (_cfg->C->trace_opto_output()) | |
| 2103 dump_available(); | |
| 2104 #endif | |
| 2105 | |
| 2106 // Walk all the definitions, decrementing use counts, and | |
| 2107 // if a definition has a 0 use count, place it in the available list. | |
| 2108 DecrementUseCounts(n,bb); | |
| 2109 } | |
| 2110 | |
| 2111 //------------------------------ComputeUseCount-------------------------------- | |
| 2112 // This method sets the use count within a basic block. We will ignore all | |
| 2113 // uses outside the current basic block. As we are doing a backwards walk, | |
| 2114 // any node we reach that has a use count of 0 may be scheduled. This also | |
| 2115 // avoids the problem of cyclic references from phi nodes, as long as phi | |
| 2116 // nodes are at the front of the basic block. This method also initializes | |
| 2117 // the available list to the set of instructions that have no uses within this | |
| 2118 // basic block. | |
| 2119 void Scheduling::ComputeUseCount(const Block *bb) { | |
| 2120 #ifndef PRODUCT | |
| 2121 if (_cfg->C->trace_opto_output()) | |
| 2122 tty->print("# -> ComputeUseCount\n"); | |
| 2123 #endif | |
| 2124 | |
| 2125 // Clear the list of available and scheduled instructions, just in case | |
| 2126 _available.clear(); | |
| 2127 _scheduled.clear(); | |
| 2128 | |
| 2129 // No delay slot specified | |
| 2130 _unconditional_delay_slot = NULL; | |
| 2131 | |
| 2132 #ifdef ASSERT | |
| 2133 for( uint i=0; i < bb->_nodes.size(); i++ ) | |
| 2134 assert( _uses[bb->_nodes[i]->_idx] == 0, "_use array not clean" ); | |
| 2135 #endif | |
| 2136 | |
| 2137 // Force the _uses count to never go to zero for unscheduable pieces | |
| 2138 // of the block | |
| 2139 for( uint k = 0; k < _bb_start; k++ ) | |
| 2140 _uses[bb->_nodes[k]->_idx] = 1; | |
| 2141 for( uint l = _bb_end; l < bb->_nodes.size(); l++ ) | |
| 2142 _uses[bb->_nodes[l]->_idx] = 1; | |
| 2143 | |
| 2144 // Iterate backwards over the instructions in the block. Don't count the | |
| 2145 // branch projections at end or the block header instructions. | |
| 2146 for( uint j = _bb_end-1; j >= _bb_start; j-- ) { | |
| 2147 Node *n = bb->_nodes[j]; | |
| 2148 if( n->is_Proj() ) continue; // Projections handled another way | |
| 2149 | |
| 2150 // Account for all uses | |
| 2151 for ( uint k = 0; k < n->len(); k++ ) { | |
| 2152 Node *inp = n->in(k); | |
| 2153 if (!inp) continue; | |
| 2154 assert(inp != n, "no cycles allowed" ); | |
| 2155 if( _bbs[inp->_idx] == bb ) { // Block-local use? | |
| 2156 if( inp->is_Proj() ) // Skip through Proj's | |
| 2157 inp = inp->in(0); | |
| 2158 ++_uses[inp->_idx]; // Count 1 block-local use | |
| 2159 } | |
| 2160 } | |
| 2161 | |
| 2162 // If this instruction has a 0 use count, then it is available | |
| 2163 if (!_uses[n->_idx]) { | |
| 2164 _current_latency[n->_idx] = _bundle_cycle_number; | |
| 2165 AddNodeToAvailableList(n); | |
| 2166 } | |
| 2167 | |
| 2168 #ifndef PRODUCT | |
| 2169 if (_cfg->C->trace_opto_output()) { | |
| 2170 tty->print("# uses: %3d: ", _uses[n->_idx]); | |
| 2171 n->dump(); | |
| 2172 } | |
| 2173 #endif | |
| 2174 } | |
| 2175 | |
| 2176 #ifndef PRODUCT | |
| 2177 if (_cfg->C->trace_opto_output()) | |
| 2178 tty->print("# <- ComputeUseCount\n"); | |
| 2179 #endif | |
| 2180 } | |
| 2181 | |
| 2182 // This routine performs scheduling on each basic block in reverse order, | |
| 2183 // using instruction latencies and taking into account function unit | |
| 2184 // availability. | |
| 2185 void Scheduling::DoScheduling() { | |
| 2186 #ifndef PRODUCT | |
| 2187 if (_cfg->C->trace_opto_output()) | |
| 2188 tty->print("# -> DoScheduling\n"); | |
| 2189 #endif | |
| 2190 | |
| 2191 Block *succ_bb = NULL; | |
| 2192 Block *bb; | |
| 2193 | |
| 2194 // Walk over all the basic blocks in reverse order | |
| 2195 for( int i=_cfg->_num_blocks-1; i >= 0; succ_bb = bb, i-- ) { | |
| 2196 bb = _cfg->_blocks[i]; | |
| 2197 | |
| 2198 #ifndef PRODUCT | |
| 2199 if (_cfg->C->trace_opto_output()) { | |
| 2200 tty->print("# Schedule BB#%03d (initial)\n", i); | |
| 2201 for (uint j = 0; j < bb->_nodes.size(); j++) | |
| 2202 bb->_nodes[j]->dump(); | |
| 2203 } | |
| 2204 #endif | |
| 2205 | |
| 2206 // On the head node, skip processing | |
| 2207 if( bb == _cfg->_broot ) | |
| 2208 continue; | |
| 2209 | |
| 2210 // Skip empty, connector blocks | |
| 2211 if (bb->is_connector()) | |
| 2212 continue; | |
| 2213 | |
| 2214 // If the following block is not the sole successor of | |
| 2215 // this one, then reset the pipeline information | |
| 2216 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) { | |
| 2217 #ifndef PRODUCT | |
| 2218 if (_cfg->C->trace_opto_output()) { | |
| 2219 tty->print("*** bundle start of next BB, node %d, for %d instructions\n", | |
| 2220 _next_node->_idx, _bundle_instr_count); | |
| 2221 } | |
| 2222 #endif | |
| 2223 step_and_clear(); | |
| 2224 } | |
| 2225 | |
| 2226 // Leave untouched the starting instruction, any Phis, a CreateEx node | |
| 2227 // or Top. bb->_nodes[_bb_start] is the first schedulable instruction. | |
| 2228 _bb_end = bb->_nodes.size()-1; | |
| 2229 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) { | |
| 2230 Node *n = bb->_nodes[_bb_start]; | |
| 2231 // Things not matched, like Phinodes and ProjNodes don't get scheduled. | |
| 2232 // Also, MachIdealNodes do not get scheduled | |
| 2233 if( !n->is_Mach() ) continue; // Skip non-machine nodes | |
| 2234 MachNode *mach = n->as_Mach(); | |
| 2235 int iop = mach->ideal_Opcode(); | |
| 2236 if( iop == Op_CreateEx ) continue; // CreateEx is pinned | |
| 2237 if( iop == Op_Con ) continue; // Do not schedule Top | |
| 2238 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes | |
| 2239 mach->pipeline() == MachNode::pipeline_class() && | |
| 2240 !n->is_SpillCopy() ) // Breakpoints, Prolog, etc | |
| 2241 continue; | |
| 2242 break; // Funny loop structure to be sure... | |
| 2243 } | |
| 2244 // Compute last "interesting" instruction in block - last instruction we | |
| 2245 // might schedule. _bb_end points just after last schedulable inst. We | |
| 2246 // normally schedule conditional branches (despite them being forced last | |
| 2247 // in the block), because they have delay slots we can fill. Calls all | |
| 2248 // have their delay slots filled in the template expansions, so we don't | |
| 2249 // bother scheduling them. | |
| 2250 Node *last = bb->_nodes[_bb_end]; | |
| 2251 if( last->is_Catch() || | |
| 2252 (last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) { | |
| 2253 // There must be a prior call. Skip it. | |
| 2254 while( !bb->_nodes[--_bb_end]->is_Call() ) { | |
| 2255 assert( bb->_nodes[_bb_end]->is_Proj(), "skipping projections after expected call" ); | |
| 2256 } | |
| 2257 } else if( last->is_MachNullCheck() ) { | |
| 2258 // Backup so the last null-checked memory instruction is | |
| 2259 // outside the schedulable range. Skip over the nullcheck, | |
| 2260 // projection, and the memory nodes. | |
| 2261 Node *mem = last->in(1); | |
| 2262 do { | |
| 2263 _bb_end--; | |
| 2264 } while (mem != bb->_nodes[_bb_end]); | |
| 2265 } else { | |
| 2266 // Set _bb_end to point after last schedulable inst. | |
| 2267 _bb_end++; | |
| 2268 } | |
| 2269 | |
| 2270 assert( _bb_start <= _bb_end, "inverted block ends" ); | |
| 2271 | |
| 2272 // Compute the register antidependencies for the basic block | |
| 2273 ComputeRegisterAntidependencies(bb); | |
| 2274 if (_cfg->C->failing()) return; // too many D-U pinch points | |
| 2275 | |
| 2276 // Compute intra-bb latencies for the nodes | |
| 2277 ComputeLocalLatenciesForward(bb); | |
| 2278 | |
| 2279 // Compute the usage within the block, and set the list of all nodes | |
| 2280 // in the block that have no uses within the block. | |
| 2281 ComputeUseCount(bb); | |
| 2282 | |
| 2283 // Schedule the remaining instructions in the block | |
| 2284 while ( _available.size() > 0 ) { | |
| 2285 Node *n = ChooseNodeToBundle(); | |
| 2286 AddNodeToBundle(n,bb); | |
| 2287 } | |
| 2288 | |
| 2289 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" ); | |
| 2290 #ifdef ASSERT | |
| 2291 for( uint l = _bb_start; l < _bb_end; l++ ) { | |
| 2292 Node *n = bb->_nodes[l]; | |
| 2293 uint m; | |
| 2294 for( m = 0; m < _bb_end-_bb_start; m++ ) | |
| 2295 if( _scheduled[m] == n ) | |
| 2296 break; | |
| 2297 assert( m < _bb_end-_bb_start, "instruction missing in schedule" ); | |
| 2298 } | |
| 2299 #endif | |
| 2300 | |
| 2301 // Now copy the instructions (in reverse order) back to the block | |
| 2302 for ( uint k = _bb_start; k < _bb_end; k++ ) | |
| 2303 bb->_nodes.map(k, _scheduled[_bb_end-k-1]); | |
| 2304 | |
| 2305 #ifndef PRODUCT | |
| 2306 if (_cfg->C->trace_opto_output()) { | |
| 2307 tty->print("# Schedule BB#%03d (final)\n", i); | |
| 2308 uint current = 0; | |
| 2309 for (uint j = 0; j < bb->_nodes.size(); j++) { | |
| 2310 Node *n = bb->_nodes[j]; | |
| 2311 if( valid_bundle_info(n) ) { | |
| 2312 Bundle *bundle = node_bundling(n); | |
| 2313 if (bundle->instr_count() > 0 || bundle->flags() > 0) { | |
| 2314 tty->print("*** Bundle: "); | |
| 2315 bundle->dump(); | |
| 2316 } | |
| 2317 n->dump(); | |
| 2318 } | |
| 2319 } | |
| 2320 } | |
| 2321 #endif | |
| 2322 #ifdef ASSERT | |
| 2323 verify_good_schedule(bb,"after block local scheduling"); | |
| 2324 #endif | |
| 2325 } | |
| 2326 | |
| 2327 #ifndef PRODUCT | |
| 2328 if (_cfg->C->trace_opto_output()) | |
| 2329 tty->print("# <- DoScheduling\n"); | |
| 2330 #endif | |
| 2331 | |
| 2332 // Record final node-bundling array location | |
| 2333 _regalloc->C->set_node_bundling_base(_node_bundling_base); | |
| 2334 | |
| 2335 } // end DoScheduling | |
| 2336 | |
| 2337 //------------------------------verify_good_schedule--------------------------- | |
| 2338 // Verify that no live-range used in the block is killed in the block by a | |
| 2339 // wrong DEF. This doesn't verify live-ranges that span blocks. | |
| 2340 | |
| 2341 // Check for edge existence. Used to avoid adding redundant precedence edges. | |
| 2342 static bool edge_from_to( Node *from, Node *to ) { | |
| 2343 for( uint i=0; i<from->len(); i++ ) | |
| 2344 if( from->in(i) == to ) | |
| 2345 return true; | |
| 2346 return false; | |
| 2347 } | |
| 2348 | |
| 2349 #ifdef ASSERT | |
| 2350 //------------------------------verify_do_def---------------------------------- | |
| 2351 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) { | |
| 2352 // Check for bad kills | |
| 2353 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow | |
| 2354 Node *prior_use = _reg_node[def]; | |
| 2355 if( prior_use && !edge_from_to(prior_use,n) ) { | |
| 2356 tty->print("%s = ",OptoReg::as_VMReg(def)->name()); | |
| 2357 n->dump(); | |
| 2358 tty->print_cr("..."); | |
| 2359 prior_use->dump(); | |
| 2360 assert_msg(edge_from_to(prior_use,n),msg); | |
| 2361 } | |
| 2362 _reg_node.map(def,NULL); // Kill live USEs | |
| 2363 } | |
| 2364 } | |
| 2365 | |
| 2366 //------------------------------verify_good_schedule--------------------------- | |
| 2367 void Scheduling::verify_good_schedule( Block *b, const char *msg ) { | |
| 2368 | |
| 2369 // Zap to something reasonable for the verify code | |
| 2370 _reg_node.clear(); | |
| 2371 | |
| 2372 // Walk over the block backwards. Check to make sure each DEF doesn't | |
| 2373 // kill a live value (other than the one it's supposed to). Add each | |
| 2374 // USE to the live set. | |
| 2375 for( uint i = b->_nodes.size()-1; i >= _bb_start; i-- ) { | |
| 2376 Node *n = b->_nodes[i]; | |
| 2377 int n_op = n->Opcode(); | |
| 2378 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
| 2379 // Fat-proj kills a slew of registers | |
| 2380 RegMask rm = n->out_RegMask();// Make local copy | |
| 2381 while( rm.is_NotEmpty() ) { | |
| 2382 OptoReg::Name kill = rm.find_first_elem(); | |
| 2383 rm.Remove(kill); | |
| 2384 verify_do_def( n, kill, msg ); | |
| 2385 } | |
| 2386 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes | |
| 2387 // Get DEF'd registers the normal way | |
| 2388 verify_do_def( n, _regalloc->get_reg_first(n), msg ); | |
| 2389 verify_do_def( n, _regalloc->get_reg_second(n), msg ); | |
| 2390 } | |
| 2391 | |
| 2392 // Now make all USEs live | |
| 2393 for( uint i=1; i<n->req(); i++ ) { | |
| 2394 Node *def = n->in(i); | |
| 2395 assert(def != 0, "input edge required"); | |
| 2396 OptoReg::Name reg_lo = _regalloc->get_reg_first(def); | |
| 2397 OptoReg::Name reg_hi = _regalloc->get_reg_second(def); | |
| 2398 if( OptoReg::is_valid(reg_lo) ) { | |
| 2399 assert_msg(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), msg ); | |
| 2400 _reg_node.map(reg_lo,n); | |
| 2401 } | |
| 2402 if( OptoReg::is_valid(reg_hi) ) { | |
| 2403 assert_msg(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), msg ); | |
| 2404 _reg_node.map(reg_hi,n); | |
| 2405 } | |
| 2406 } | |
| 2407 | |
| 2408 } | |
| 2409 | |
| 2410 // Zap to something reasonable for the Antidependence code | |
| 2411 _reg_node.clear(); | |
| 2412 } | |
| 2413 #endif | |
| 2414 | |
| 2415 // Conditionally add precedence edges. Avoid putting edges on Projs. | |
| 2416 static void add_prec_edge_from_to( Node *from, Node *to ) { | |
| 2417 if( from->is_Proj() ) { // Put precedence edge on Proj's input | |
| 2418 assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" ); | |
| 2419 from = from->in(0); | |
| 2420 } | |
| 2421 if( from != to && // No cycles (for things like LD L0,[L0+4] ) | |
| 2422 !edge_from_to( from, to ) ) // Avoid duplicate edge | |
| 2423 from->add_prec(to); | |
| 2424 } | |
| 2425 | |
| 2426 //------------------------------anti_do_def------------------------------------ | |
| 2427 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) { | |
| 2428 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow | |
| 2429 return; | |
| 2430 | |
| 2431 Node *pinch = _reg_node[def_reg]; // Get pinch point | |
| 2432 if( !pinch || _bbs[pinch->_idx] != b || // No pinch-point yet? | |
| 2433 is_def ) { // Check for a true def (not a kill) | |
| 2434 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point | |
| 2435 return; | |
| 2436 } | |
| 2437 | |
| 2438 Node *kill = def; // Rename 'def' to more descriptive 'kill' | |
| 2439 debug_only( def = (Node*)0xdeadbeef; ) | |
| 2440 | |
| 2441 // After some number of kills there _may_ be a later def | |
| 2442 Node *later_def = NULL; | |
| 2443 | |
| 2444 // Finding a kill requires a real pinch-point. | |
| 2445 // Check for not already having a pinch-point. | |
| 2446 // Pinch points are Op_Node's. | |
| 2447 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point? | |
| 2448 later_def = pinch; // Must be def/kill as optimistic pinch-point | |
| 2449 if ( _pinch_free_list.size() > 0) { | |
| 2450 pinch = _pinch_free_list.pop(); | |
| 2451 } else { | |
| 2452 pinch = new (_cfg->C, 1) Node(1); // Pinch point to-be | |
| 2453 } | |
| 2454 if (pinch->_idx >= _regalloc->node_regs_max_index()) { | |
| 2455 _cfg->C->record_method_not_compilable("too many D-U pinch points"); | |
| 2456 return; | |
| 2457 } | |
| 2458 _bbs.map(pinch->_idx,b); // Pretend it's valid in this block (lazy init) | |
| 2459 _reg_node.map(def_reg,pinch); // Record pinch-point | |
| 2460 //_regalloc->set_bad(pinch->_idx); // Already initialized this way. | |
| 2461 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill | |
| 2462 pinch->init_req(0, _cfg->C->top()); // set not NULL for the next call | |
| 2463 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch | |
| 2464 later_def = NULL; // and no later def | |
| 2465 } | |
| 2466 pinch->set_req(0,later_def); // Hook later def so we can find it | |
| 2467 } else { // Else have valid pinch point | |
| 2468 if( pinch->in(0) ) // If there is a later-def | |
| 2469 later_def = pinch->in(0); // Get it | |
| 2470 } | |
| 2471 | |
| 2472 // Add output-dependence edge from later def to kill | |
| 2473 if( later_def ) // If there is some original def | |
| 2474 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill | |
| 2475 | |
| 2476 // See if current kill is also a use, and so is forced to be the pinch-point. | |
| 2477 if( pinch->Opcode() == Op_Node ) { | |
| 2478 Node *uses = kill->is_Proj() ? kill->in(0) : kill; | |
| 2479 for( uint i=1; i<uses->req(); i++ ) { | |
| 2480 if( _regalloc->get_reg_first(uses->in(i)) == def_reg || | |
| 2481 _regalloc->get_reg_second(uses->in(i)) == def_reg ) { | |
| 2482 // Yes, found a use/kill pinch-point | |
| 2483 pinch->set_req(0,NULL); // | |
| 2484 pinch->replace_by(kill); // Move anti-dep edges up | |
| 2485 pinch = kill; | |
| 2486 _reg_node.map(def_reg,pinch); | |
| 2487 return; | |
| 2488 } | |
| 2489 } | |
| 2490 } | |
| 2491 | |
| 2492 // Add edge from kill to pinch-point | |
| 2493 add_prec_edge_from_to(kill,pinch); | |
| 2494 } | |
| 2495 | |
| 2496 //------------------------------anti_do_use------------------------------------ | |
| 2497 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) { | |
| 2498 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow | |
| 2499 return; | |
| 2500 Node *pinch = _reg_node[use_reg]; // Get pinch point | |
| 2501 // Check for no later def_reg/kill in block | |
| 2502 if( pinch && _bbs[pinch->_idx] == b && | |
| 2503 // Use has to be block-local as well | |
| 2504 _bbs[use->_idx] == b ) { | |
| 2505 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?) | |
| 2506 pinch->req() == 1 ) { // pinch not yet in block? | |
| 2507 pinch->del_req(0); // yank pointer to later-def, also set flag | |
| 2508 // Insert the pinch-point in the block just after the last use | |
| 2509 b->_nodes.insert(b->find_node(use)+1,pinch); | |
| 2510 _bb_end++; // Increase size scheduled region in block | |
| 2511 } | |
| 2512 | |
| 2513 add_prec_edge_from_to(pinch,use); | |
| 2514 } | |
| 2515 } | |
| 2516 | |
| 2517 //------------------------------ComputeRegisterAntidependences----------------- | |
| 2518 // We insert antidependences between the reads and following write of | |
| 2519 // allocated registers to prevent illegal code motion. Hopefully, the | |
| 2520 // number of added references should be fairly small, especially as we | |
| 2521 // are only adding references within the current basic block. | |
| 2522 void Scheduling::ComputeRegisterAntidependencies(Block *b) { | |
| 2523 | |
| 2524 #ifdef ASSERT | |
| 2525 verify_good_schedule(b,"before block local scheduling"); | |
| 2526 #endif | |
| 2527 | |
| 2528 // A valid schedule, for each register independently, is an endless cycle | |
| 2529 // of: a def, then some uses (connected to the def by true dependencies), | |
| 2530 // then some kills (defs with no uses), finally the cycle repeats with a new | |
| 2531 // def. The uses are allowed to float relative to each other, as are the | |
| 2532 // kills. No use is allowed to slide past a kill (or def). This requires | |
| 2533 // antidependencies between all uses of a single def and all kills that | |
| 2534 // follow, up to the next def. More edges are redundant, because later defs | |
| 2535 // & kills are already serialized with true or antidependencies. To keep | |
| 2536 // the edge count down, we add a 'pinch point' node if there's more than | |
| 2537 // one use or more than one kill/def. | |
| 2538 | |
| 2539 // We add dependencies in one bottom-up pass. | |
| 2540 | |
| 2541 // For each instruction we handle it's DEFs/KILLs, then it's USEs. | |
| 2542 | |
| 2543 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this | |
| 2544 // register. If not, we record the DEF/KILL in _reg_node, the | |
| 2545 // register-to-def mapping. If there is a prior DEF/KILL, we insert a | |
| 2546 // "pinch point", a new Node that's in the graph but not in the block. | |
| 2547 // We put edges from the prior and current DEF/KILLs to the pinch point. | |
| 2548 // We put the pinch point in _reg_node. If there's already a pinch point | |
| 2549 // we merely add an edge from the current DEF/KILL to the pinch point. | |
| 2550 | |
| 2551 // After doing the DEF/KILLs, we handle USEs. For each used register, we | |
| 2552 // put an edge from the pinch point to the USE. | |
| 2553 | |
| 2554 // To be expedient, the _reg_node array is pre-allocated for the whole | |
| 2555 // compilation. _reg_node is lazily initialized; it either contains a NULL, | |
| 2556 // or a valid def/kill/pinch-point, or a leftover node from some prior | |
| 2557 // block. Leftover node from some prior block is treated like a NULL (no | |
| 2558 // prior def, so no anti-dependence needed). Valid def is distinguished by | |
| 2559 // it being in the current block. | |
| 2560 bool fat_proj_seen = false; | |
| 2561 uint last_safept = _bb_end-1; | |
| 2562 Node* end_node = (_bb_end-1 >= _bb_start) ? b->_nodes[last_safept] : NULL; | |
| 2563 Node* last_safept_node = end_node; | |
| 2564 for( uint i = _bb_end-1; i >= _bb_start; i-- ) { | |
| 2565 Node *n = b->_nodes[i]; | |
| 2566 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges | |
| 2567 if( n->Opcode() == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) { | |
| 2568 // Fat-proj kills a slew of registers | |
| 2569 // This can add edges to 'n' and obscure whether or not it was a def, | |
| 2570 // hence the is_def flag. | |
| 2571 fat_proj_seen = true; | |
| 2572 RegMask rm = n->out_RegMask();// Make local copy | |
| 2573 while( rm.is_NotEmpty() ) { | |
| 2574 OptoReg::Name kill = rm.find_first_elem(); | |
| 2575 rm.Remove(kill); | |
| 2576 anti_do_def( b, n, kill, is_def ); | |
| 2577 } | |
| 2578 } else { | |
| 2579 // Get DEF'd registers the normal way | |
| 2580 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def ); | |
| 2581 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def ); | |
| 2582 } | |
| 2583 | |
| 2584 // Check each register used by this instruction for a following DEF/KILL | |
| 2585 // that must occur afterward and requires an anti-dependence edge. | |
| 2586 for( uint j=0; j<n->req(); j++ ) { | |
| 2587 Node *def = n->in(j); | |
| 2588 if( def ) { | |
| 2589 assert( def->Opcode() != Op_MachProj || def->ideal_reg() != MachProjNode::fat_proj, "" ); | |
| 2590 anti_do_use( b, n, _regalloc->get_reg_first(def) ); | |
| 2591 anti_do_use( b, n, _regalloc->get_reg_second(def) ); | |
| 2592 } | |
| 2593 } | |
| 2594 // Do not allow defs of new derived values to float above GC | |
| 2595 // points unless the base is definitely available at the GC point. | |
| 2596 | |
| 2597 Node *m = b->_nodes[i]; | |
| 2598 | |
| 2599 // Add precedence edge from following safepoint to use of derived pointer | |
| 2600 if( last_safept_node != end_node && | |
| 2601 m != last_safept_node) { | |
| 2602 for (uint k = 1; k < m->req(); k++) { | |
| 2603 const Type *t = m->in(k)->bottom_type(); | |
| 2604 if( t->isa_oop_ptr() && | |
| 2605 t->is_ptr()->offset() != 0 ) { | |
| 2606 last_safept_node->add_prec( m ); | |
| 2607 break; | |
| 2608 } | |
| 2609 } | |
| 2610 } | |
| 2611 | |
| 2612 if( n->jvms() ) { // Precedence edge from derived to safept | |
| 2613 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use() | |
| 2614 if( b->_nodes[last_safept] != last_safept_node ) { | |
| 2615 last_safept = b->find_node(last_safept_node); | |
| 2616 } | |
| 2617 for( uint j=last_safept; j > i; j-- ) { | |
| 2618 Node *mach = b->_nodes[j]; | |
| 2619 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP ) | |
| 2620 mach->add_prec( n ); | |
| 2621 } | |
| 2622 last_safept = i; | |
| 2623 last_safept_node = m; | |
| 2624 } | |
| 2625 } | |
| 2626 | |
| 2627 if (fat_proj_seen) { | |
| 2628 // Garbage collect pinch nodes that were not consumed. | |
| 2629 // They are usually created by a fat kill MachProj for a call. | |
| 2630 garbage_collect_pinch_nodes(); | |
| 2631 } | |
| 2632 } | |
| 2633 | |
| 2634 //------------------------------garbage_collect_pinch_nodes------------------------------- | |
| 2635 | |
| 2636 // Garbage collect pinch nodes for reuse by other blocks. | |
| 2637 // | |
| 2638 // The block scheduler's insertion of anti-dependence | |
| 2639 // edges creates many pinch nodes when the block contains | |
| 2640 // 2 or more Calls. A pinch node is used to prevent a | |
| 2641 // combinatorial explosion of edges. If a set of kills for a | |
| 2642 // register is anti-dependent on a set of uses (or defs), rather | |
| 2643 // than adding an edge in the graph between each pair of kill | |
| 2644 // and use (or def), a pinch is inserted between them: | |
| 2645 // | |
| 2646 // use1 use2 use3 | |
| 2647 // \ | / | |
| 2648 // \ | / | |
| 2649 // pinch | |
| 2650 // / | \ | |
| 2651 // / | \ | |
| 2652 // kill1 kill2 kill3 | |
| 2653 // | |
| 2654 // One pinch node is created per register killed when | |
| 2655 // the second call is encountered during a backwards pass | |
| 2656 // over the block. Most of these pinch nodes are never | |
| 2657 // wired into the graph because the register is never | |
| 2658 // used or def'ed in the block. | |
| 2659 // | |
| 2660 void Scheduling::garbage_collect_pinch_nodes() { | |
| 2661 #ifndef PRODUCT | |
| 2662 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:"); | |
| 2663 #endif | |
| 2664 int trace_cnt = 0; | |
| 2665 for (uint k = 0; k < _reg_node.Size(); k++) { | |
| 2666 Node* pinch = _reg_node[k]; | |
| 2667 if (pinch != NULL && pinch->Opcode() == Op_Node && | |
| 2668 // no predecence input edges | |
| 2669 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) { | |
| 2670 cleanup_pinch(pinch); | |
| 2671 _pinch_free_list.push(pinch); | |
| 2672 _reg_node.map(k, NULL); | |
| 2673 #ifndef PRODUCT | |
| 2674 if (_cfg->C->trace_opto_output()) { | |
| 2675 trace_cnt++; | |
| 2676 if (trace_cnt > 40) { | |
| 2677 tty->print("\n"); | |
| 2678 trace_cnt = 0; | |
| 2679 } | |
| 2680 tty->print(" %d", pinch->_idx); | |
| 2681 } | |
| 2682 #endif | |
| 2683 } | |
| 2684 } | |
| 2685 #ifndef PRODUCT | |
| 2686 if (_cfg->C->trace_opto_output()) tty->print("\n"); | |
| 2687 #endif | |
| 2688 } | |
| 2689 | |
| 2690 // Clean up a pinch node for reuse. | |
| 2691 void Scheduling::cleanup_pinch( Node *pinch ) { | |
| 2692 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking"); | |
| 2693 | |
| 2694 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) { | |
| 2695 Node* use = pinch->last_out(i); | |
| 2696 uint uses_found = 0; | |
| 2697 for (uint j = use->req(); j < use->len(); j++) { | |
| 2698 if (use->in(j) == pinch) { | |
| 2699 use->rm_prec(j); | |
| 2700 uses_found++; | |
| 2701 } | |
| 2702 } | |
| 2703 assert(uses_found > 0, "must be a precedence edge"); | |
| 2704 i -= uses_found; // we deleted 1 or more copies of this edge | |
| 2705 } | |
| 2706 // May have a later_def entry | |
| 2707 pinch->set_req(0, NULL); | |
| 2708 } | |
| 2709 | |
| 2710 //------------------------------print_statistics------------------------------- | |
| 2711 #ifndef PRODUCT | |
| 2712 | |
| 2713 void Scheduling::dump_available() const { | |
| 2714 tty->print("#Availist "); | |
| 2715 for (uint i = 0; i < _available.size(); i++) | |
| 2716 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]); | |
| 2717 tty->cr(); | |
| 2718 } | |
| 2719 | |
| 2720 // Print Scheduling Statistics | |
| 2721 void Scheduling::print_statistics() { | |
| 2722 // Print the size added by nops for bundling | |
| 2723 tty->print("Nops added %d bytes to total of %d bytes", | |
| 2724 _total_nop_size, _total_method_size); | |
| 2725 if (_total_method_size > 0) | |
| 2726 tty->print(", for %.2f%%", | |
| 2727 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0); | |
| 2728 tty->print("\n"); | |
| 2729 | |
| 2730 // Print the number of branch shadows filled | |
| 2731 if (Pipeline::_branch_has_delay_slot) { | |
| 2732 tty->print("Of %d branches, %d had unconditional delay slots filled", | |
| 2733 _total_branches, _total_unconditional_delays); | |
| 2734 if (_total_branches > 0) | |
| 2735 tty->print(", for %.2f%%", | |
| 2736 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0); | |
| 2737 tty->print("\n"); | |
| 2738 } | |
| 2739 | |
| 2740 uint total_instructions = 0, total_bundles = 0; | |
| 2741 | |
| 2742 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) { | |
| 2743 uint bundle_count = _total_instructions_per_bundle[i]; | |
| 2744 total_instructions += bundle_count * i; | |
| 2745 total_bundles += bundle_count; | |
| 2746 } | |
| 2747 | |
| 2748 if (total_bundles > 0) | |
| 2749 tty->print("Average ILP (excluding nops) is %.2f\n", | |
| 2750 ((double)total_instructions) / ((double)total_bundles)); | |
| 2751 } | |
| 2752 #endif |