matcher.cpp revision 164:c436414a719e
1/* 2 * Copyright 1997-2007 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/_matcher.cpp.incl" 27 28OptoReg::Name OptoReg::c_frame_pointer; 29 30 31 32const int Matcher::base2reg[Type::lastype] = { 33 Node::NotAMachineReg,0,0, Op_RegI, Op_RegL, 0, Op_RegN, 34 Node::NotAMachineReg, Node::NotAMachineReg, /* tuple, array */ 35 Op_RegP, Op_RegP, Op_RegP, Op_RegP, Op_RegP, Op_RegP, /* the pointers */ 36 0, 0/*abio*/, 37 Op_RegP /* Return address */, 0, /* the memories */ 38 Op_RegF, Op_RegF, Op_RegF, Op_RegD, Op_RegD, Op_RegD, 39 0 /*bottom*/ 40}; 41 42const RegMask *Matcher::idealreg2regmask[_last_machine_leaf]; 43RegMask Matcher::mreg2regmask[_last_Mach_Reg]; 44RegMask Matcher::STACK_ONLY_mask; 45RegMask Matcher::c_frame_ptr_mask; 46const uint Matcher::_begin_rematerialize = _BEGIN_REMATERIALIZE; 47const uint Matcher::_end_rematerialize = _END_REMATERIALIZE; 48 49//---------------------------Matcher------------------------------------------- 50Matcher::Matcher( Node_List &proj_list ) : 51 PhaseTransform( Phase::Ins_Select ), 52#ifdef ASSERT 53 _old2new_map(C->comp_arena()), 54#endif 55 _shared_constants(C->comp_arena()), 56 _reduceOp(reduceOp), _leftOp(leftOp), _rightOp(rightOp), 57 _swallowed(swallowed), 58 _begin_inst_chain_rule(_BEGIN_INST_CHAIN_RULE), 59 _end_inst_chain_rule(_END_INST_CHAIN_RULE), 60 _must_clone(must_clone), _proj_list(proj_list), 61 _register_save_policy(register_save_policy), 62 _c_reg_save_policy(c_reg_save_policy), 63 _register_save_type(register_save_type), 64 _ruleName(ruleName), 65 _allocation_started(false), 66 _states_arena(Chunk::medium_size), 67 _visited(&_states_arena), 68 _shared(&_states_arena), 69 _dontcare(&_states_arena) { 70 C->set_matcher(this); 71 72 idealreg2spillmask[Op_RegI] = NULL; 73 idealreg2spillmask[Op_RegN] = NULL; 74 idealreg2spillmask[Op_RegL] = NULL; 75 idealreg2spillmask[Op_RegF] = NULL; 76 idealreg2spillmask[Op_RegD] = NULL; 77 idealreg2spillmask[Op_RegP] = NULL; 78 79 idealreg2debugmask[Op_RegI] = NULL; 80 idealreg2debugmask[Op_RegN] = NULL; 81 idealreg2debugmask[Op_RegL] = NULL; 82 idealreg2debugmask[Op_RegF] = NULL; 83 idealreg2debugmask[Op_RegD] = NULL; 84 idealreg2debugmask[Op_RegP] = NULL; 85} 86 87//------------------------------warp_incoming_stk_arg------------------------ 88// This warps a VMReg into an OptoReg::Name 89OptoReg::Name Matcher::warp_incoming_stk_arg( VMReg reg ) { 90 OptoReg::Name warped; 91 if( reg->is_stack() ) { // Stack slot argument? 92 warped = OptoReg::add(_old_SP, reg->reg2stack() ); 93 warped = OptoReg::add(warped, C->out_preserve_stack_slots()); 94 if( warped >= _in_arg_limit ) 95 _in_arg_limit = OptoReg::add(warped, 1); // Bump max stack slot seen 96 if (!RegMask::can_represent(warped)) { 97 // the compiler cannot represent this method's calling sequence 98 C->record_method_not_compilable_all_tiers("unsupported incoming calling sequence"); 99 return OptoReg::Bad; 100 } 101 return warped; 102 } 103 return OptoReg::as_OptoReg(reg); 104} 105 106//---------------------------compute_old_SP------------------------------------ 107OptoReg::Name Compile::compute_old_SP() { 108 int fixed = fixed_slots(); 109 int preserve = in_preserve_stack_slots(); 110 return OptoReg::stack2reg(round_to(fixed + preserve, Matcher::stack_alignment_in_slots())); 111} 112 113 114 115#ifdef ASSERT 116void Matcher::verify_new_nodes_only(Node* xroot) { 117 // Make sure that the new graph only references new nodes 118 ResourceMark rm; 119 Unique_Node_List worklist; 120 VectorSet visited(Thread::current()->resource_area()); 121 worklist.push(xroot); 122 while (worklist.size() > 0) { 123 Node* n = worklist.pop(); 124 visited <<= n->_idx; 125 assert(C->node_arena()->contains(n), "dead node"); 126 for (uint j = 0; j < n->req(); j++) { 127 Node* in = n->in(j); 128 if (in != NULL) { 129 assert(C->node_arena()->contains(in), "dead node"); 130 if (!visited.test(in->_idx)) { 131 worklist.push(in); 132 } 133 } 134 } 135 } 136} 137#endif 138 139 140//---------------------------match--------------------------------------------- 141void Matcher::match( ) { 142 // One-time initialization of some register masks. 143 init_spill_mask( C->root()->in(1) ); 144 _return_addr_mask = return_addr(); 145#ifdef _LP64 146 // Pointers take 2 slots in 64-bit land 147 _return_addr_mask.Insert(OptoReg::add(return_addr(),1)); 148#endif 149 150 // Map a Java-signature return type into return register-value 151 // machine registers for 0, 1 and 2 returned values. 152 const TypeTuple *range = C->tf()->range(); 153 if( range->cnt() > TypeFunc::Parms ) { // If not a void function 154 // Get ideal-register return type 155 int ireg = base2reg[range->field_at(TypeFunc::Parms)->base()]; 156 // Get machine return register 157 uint sop = C->start()->Opcode(); 158 OptoRegPair regs = return_value(ireg, false); 159 160 // And mask for same 161 _return_value_mask = RegMask(regs.first()); 162 if( OptoReg::is_valid(regs.second()) ) 163 _return_value_mask.Insert(regs.second()); 164 } 165 166 // --------------- 167 // Frame Layout 168 169 // Need the method signature to determine the incoming argument types, 170 // because the types determine which registers the incoming arguments are 171 // in, and this affects the matched code. 172 const TypeTuple *domain = C->tf()->domain(); 173 uint argcnt = domain->cnt() - TypeFunc::Parms; 174 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, argcnt ); 175 VMRegPair *vm_parm_regs = NEW_RESOURCE_ARRAY( VMRegPair, argcnt ); 176 _parm_regs = NEW_RESOURCE_ARRAY( OptoRegPair, argcnt ); 177 _calling_convention_mask = NEW_RESOURCE_ARRAY( RegMask, argcnt ); 178 uint i; 179 for( i = 0; i<argcnt; i++ ) { 180 sig_bt[i] = domain->field_at(i+TypeFunc::Parms)->basic_type(); 181 } 182 183 // Pass array of ideal registers and length to USER code (from the AD file) 184 // that will convert this to an array of register numbers. 185 const StartNode *start = C->start(); 186 start->calling_convention( sig_bt, vm_parm_regs, argcnt ); 187#ifdef ASSERT 188 // Sanity check users' calling convention. Real handy while trying to 189 // get the initial port correct. 190 { for (uint i = 0; i<argcnt; i++) { 191 if( !vm_parm_regs[i].first()->is_valid() && !vm_parm_regs[i].second()->is_valid() ) { 192 assert(domain->field_at(i+TypeFunc::Parms)==Type::HALF, "only allowed on halve" ); 193 _parm_regs[i].set_bad(); 194 continue; 195 } 196 VMReg parm_reg = vm_parm_regs[i].first(); 197 assert(parm_reg->is_valid(), "invalid arg?"); 198 if (parm_reg->is_reg()) { 199 OptoReg::Name opto_parm_reg = OptoReg::as_OptoReg(parm_reg); 200 assert(can_be_java_arg(opto_parm_reg) || 201 C->stub_function() == CAST_FROM_FN_PTR(address, OptoRuntime::rethrow_C) || 202 opto_parm_reg == inline_cache_reg(), 203 "parameters in register must be preserved by runtime stubs"); 204 } 205 for (uint j = 0; j < i; j++) { 206 assert(parm_reg != vm_parm_regs[j].first(), 207 "calling conv. must produce distinct regs"); 208 } 209 } 210 } 211#endif 212 213 // Do some initial frame layout. 214 215 // Compute the old incoming SP (may be called FP) as 216 // OptoReg::stack0() + locks + in_preserve_stack_slots + pad2. 217 _old_SP = C->compute_old_SP(); 218 assert( is_even(_old_SP), "must be even" ); 219 220 // Compute highest incoming stack argument as 221 // _old_SP + out_preserve_stack_slots + incoming argument size. 222 _in_arg_limit = OptoReg::add(_old_SP, C->out_preserve_stack_slots()); 223 assert( is_even(_in_arg_limit), "out_preserve must be even" ); 224 for( i = 0; i < argcnt; i++ ) { 225 // Permit args to have no register 226 _calling_convention_mask[i].Clear(); 227 if( !vm_parm_regs[i].first()->is_valid() && !vm_parm_regs[i].second()->is_valid() ) { 228 continue; 229 } 230 // calling_convention returns stack arguments as a count of 231 // slots beyond OptoReg::stack0()/VMRegImpl::stack0. We need to convert this to 232 // the allocators point of view, taking into account all the 233 // preserve area, locks & pad2. 234 235 OptoReg::Name reg1 = warp_incoming_stk_arg(vm_parm_regs[i].first()); 236 if( OptoReg::is_valid(reg1)) 237 _calling_convention_mask[i].Insert(reg1); 238 239 OptoReg::Name reg2 = warp_incoming_stk_arg(vm_parm_regs[i].second()); 240 if( OptoReg::is_valid(reg2)) 241 _calling_convention_mask[i].Insert(reg2); 242 243 // Saved biased stack-slot register number 244 _parm_regs[i].set_pair(reg2, reg1); 245 } 246 247 // Finally, make sure the incoming arguments take up an even number of 248 // words, in case the arguments or locals need to contain doubleword stack 249 // slots. The rest of the system assumes that stack slot pairs (in 250 // particular, in the spill area) which look aligned will in fact be 251 // aligned relative to the stack pointer in the target machine. Double 252 // stack slots will always be allocated aligned. 253 _new_SP = OptoReg::Name(round_to(_in_arg_limit, RegMask::SlotsPerLong)); 254 255 // Compute highest outgoing stack argument as 256 // _new_SP + out_preserve_stack_slots + max(outgoing argument size). 257 _out_arg_limit = OptoReg::add(_new_SP, C->out_preserve_stack_slots()); 258 assert( is_even(_out_arg_limit), "out_preserve must be even" ); 259 260 if (!RegMask::can_represent(OptoReg::add(_out_arg_limit,-1))) { 261 // the compiler cannot represent this method's calling sequence 262 C->record_method_not_compilable("must be able to represent all call arguments in reg mask"); 263 } 264 265 if (C->failing()) return; // bailed out on incoming arg failure 266 267 // --------------- 268 // Collect roots of matcher trees. Every node for which 269 // _shared[_idx] is cleared is guaranteed to not be shared, and thus 270 // can be a valid interior of some tree. 271 find_shared( C->root() ); 272 find_shared( C->top() ); 273 274 C->print_method("Before Matching", 2); 275 276 // Swap out to old-space; emptying new-space 277 Arena *old = C->node_arena()->move_contents(C->old_arena()); 278 279 // Save debug and profile information for nodes in old space: 280 _old_node_note_array = C->node_note_array(); 281 if (_old_node_note_array != NULL) { 282 C->set_node_note_array(new(C->comp_arena()) GrowableArray<Node_Notes*> 283 (C->comp_arena(), _old_node_note_array->length(), 284 0, NULL)); 285 } 286 287 // Pre-size the new_node table to avoid the need for range checks. 288 grow_new_node_array(C->unique()); 289 290 // Reset node counter so MachNodes start with _idx at 0 291 int nodes = C->unique(); // save value 292 C->set_unique(0); 293 294 // Recursively match trees from old space into new space. 295 // Correct leaves of new-space Nodes; they point to old-space. 296 _visited.Clear(); // Clear visit bits for xform call 297 C->set_cached_top_node(xform( C->top(), nodes )); 298 if (!C->failing()) { 299 Node* xroot = xform( C->root(), 1 ); 300 if (xroot == NULL) { 301 Matcher::soft_match_failure(); // recursive matching process failed 302 C->record_method_not_compilable("instruction match failed"); 303 } else { 304 // During matching shared constants were attached to C->root() 305 // because xroot wasn't available yet, so transfer the uses to 306 // the xroot. 307 for( DUIterator_Fast jmax, j = C->root()->fast_outs(jmax); j < jmax; j++ ) { 308 Node* n = C->root()->fast_out(j); 309 if (C->node_arena()->contains(n)) { 310 assert(n->in(0) == C->root(), "should be control user"); 311 n->set_req(0, xroot); 312 --j; 313 --jmax; 314 } 315 } 316 317 C->set_root(xroot->is_Root() ? xroot->as_Root() : NULL); 318#ifdef ASSERT 319 verify_new_nodes_only(xroot); 320#endif 321 } 322 } 323 if (C->top() == NULL || C->root() == NULL) { 324 C->record_method_not_compilable("graph lost"); // %%% cannot happen? 325 } 326 if (C->failing()) { 327 // delete old; 328 old->destruct_contents(); 329 return; 330 } 331 assert( C->top(), "" ); 332 assert( C->root(), "" ); 333 validate_null_checks(); 334 335 // Now smoke old-space 336 NOT_DEBUG( old->destruct_contents() ); 337 338 // ------------------------ 339 // Set up save-on-entry registers 340 Fixup_Save_On_Entry( ); 341} 342 343 344//------------------------------Fixup_Save_On_Entry---------------------------- 345// The stated purpose of this routine is to take care of save-on-entry 346// registers. However, the overall goal of the Match phase is to convert into 347// machine-specific instructions which have RegMasks to guide allocation. 348// So what this procedure really does is put a valid RegMask on each input 349// to the machine-specific variations of all Return, TailCall and Halt 350// instructions. It also adds edgs to define the save-on-entry values (and of 351// course gives them a mask). 352 353static RegMask *init_input_masks( uint size, RegMask &ret_adr, RegMask &fp ) { 354 RegMask *rms = NEW_RESOURCE_ARRAY( RegMask, size ); 355 // Do all the pre-defined register masks 356 rms[TypeFunc::Control ] = RegMask::Empty; 357 rms[TypeFunc::I_O ] = RegMask::Empty; 358 rms[TypeFunc::Memory ] = RegMask::Empty; 359 rms[TypeFunc::ReturnAdr] = ret_adr; 360 rms[TypeFunc::FramePtr ] = fp; 361 return rms; 362} 363 364//---------------------------init_first_stack_mask----------------------------- 365// Create the initial stack mask used by values spilling to the stack. 366// Disallow any debug info in outgoing argument areas by setting the 367// initial mask accordingly. 368void Matcher::init_first_stack_mask() { 369 370 // Allocate storage for spill masks as masks for the appropriate load type. 371 RegMask *rms = (RegMask*)C->comp_arena()->Amalloc_D(sizeof(RegMask)*12); 372 idealreg2spillmask[Op_RegN] = &rms[0]; 373 idealreg2spillmask[Op_RegI] = &rms[1]; 374 idealreg2spillmask[Op_RegL] = &rms[2]; 375 idealreg2spillmask[Op_RegF] = &rms[3]; 376 idealreg2spillmask[Op_RegD] = &rms[4]; 377 idealreg2spillmask[Op_RegP] = &rms[5]; 378 idealreg2debugmask[Op_RegN] = &rms[6]; 379 idealreg2debugmask[Op_RegI] = &rms[7]; 380 idealreg2debugmask[Op_RegL] = &rms[8]; 381 idealreg2debugmask[Op_RegF] = &rms[9]; 382 idealreg2debugmask[Op_RegD] = &rms[10]; 383 idealreg2debugmask[Op_RegP] = &rms[11]; 384 385 OptoReg::Name i; 386 387 // At first, start with the empty mask 388 C->FIRST_STACK_mask().Clear(); 389 390 // Add in the incoming argument area 391 OptoReg::Name init = OptoReg::add(_old_SP, C->out_preserve_stack_slots()); 392 for (i = init; i < _in_arg_limit; i = OptoReg::add(i,1)) 393 C->FIRST_STACK_mask().Insert(i); 394 395 // Add in all bits past the outgoing argument area 396 guarantee(RegMask::can_represent(OptoReg::add(_out_arg_limit,-1)), 397 "must be able to represent all call arguments in reg mask"); 398 init = _out_arg_limit; 399 for (i = init; RegMask::can_represent(i); i = OptoReg::add(i,1)) 400 C->FIRST_STACK_mask().Insert(i); 401 402 // Finally, set the "infinite stack" bit. 403 C->FIRST_STACK_mask().set_AllStack(); 404 405 // Make spill masks. Registers for their class, plus FIRST_STACK_mask. 406#ifdef _LP64 407 *idealreg2spillmask[Op_RegN] = *idealreg2regmask[Op_RegN]; 408 idealreg2spillmask[Op_RegN]->OR(C->FIRST_STACK_mask()); 409#endif 410 *idealreg2spillmask[Op_RegI] = *idealreg2regmask[Op_RegI]; 411 idealreg2spillmask[Op_RegI]->OR(C->FIRST_STACK_mask()); 412 *idealreg2spillmask[Op_RegL] = *idealreg2regmask[Op_RegL]; 413 idealreg2spillmask[Op_RegL]->OR(C->FIRST_STACK_mask()); 414 *idealreg2spillmask[Op_RegF] = *idealreg2regmask[Op_RegF]; 415 idealreg2spillmask[Op_RegF]->OR(C->FIRST_STACK_mask()); 416 *idealreg2spillmask[Op_RegD] = *idealreg2regmask[Op_RegD]; 417 idealreg2spillmask[Op_RegD]->OR(C->FIRST_STACK_mask()); 418 *idealreg2spillmask[Op_RegP] = *idealreg2regmask[Op_RegP]; 419 idealreg2spillmask[Op_RegP]->OR(C->FIRST_STACK_mask()); 420 421 // Make up debug masks. Any spill slot plus callee-save registers. 422 // Caller-save registers are assumed to be trashable by the various 423 // inline-cache fixup routines. 424 *idealreg2debugmask[Op_RegN]= *idealreg2spillmask[Op_RegN]; 425 *idealreg2debugmask[Op_RegI]= *idealreg2spillmask[Op_RegI]; 426 *idealreg2debugmask[Op_RegL]= *idealreg2spillmask[Op_RegL]; 427 *idealreg2debugmask[Op_RegF]= *idealreg2spillmask[Op_RegF]; 428 *idealreg2debugmask[Op_RegD]= *idealreg2spillmask[Op_RegD]; 429 *idealreg2debugmask[Op_RegP]= *idealreg2spillmask[Op_RegP]; 430 431 // Prevent stub compilations from attempting to reference 432 // callee-saved registers from debug info 433 bool exclude_soe = !Compile::current()->is_method_compilation(); 434 435 for( i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) { 436 // registers the caller has to save do not work 437 if( _register_save_policy[i] == 'C' || 438 _register_save_policy[i] == 'A' || 439 (_register_save_policy[i] == 'E' && exclude_soe) ) { 440 idealreg2debugmask[Op_RegN]->Remove(i); 441 idealreg2debugmask[Op_RegI]->Remove(i); // Exclude save-on-call 442 idealreg2debugmask[Op_RegL]->Remove(i); // registers from debug 443 idealreg2debugmask[Op_RegF]->Remove(i); // masks 444 idealreg2debugmask[Op_RegD]->Remove(i); 445 idealreg2debugmask[Op_RegP]->Remove(i); 446 } 447 } 448} 449 450//---------------------------is_save_on_entry---------------------------------- 451bool Matcher::is_save_on_entry( int reg ) { 452 return 453 _register_save_policy[reg] == 'E' || 454 _register_save_policy[reg] == 'A' || // Save-on-entry register? 455 // Also save argument registers in the trampolining stubs 456 (C->save_argument_registers() && is_spillable_arg(reg)); 457} 458 459//---------------------------Fixup_Save_On_Entry------------------------------- 460void Matcher::Fixup_Save_On_Entry( ) { 461 init_first_stack_mask(); 462 463 Node *root = C->root(); // Short name for root 464 // Count number of save-on-entry registers. 465 uint soe_cnt = number_of_saved_registers(); 466 uint i; 467 468 // Find the procedure Start Node 469 StartNode *start = C->start(); 470 assert( start, "Expect a start node" ); 471 472 // Save argument registers in the trampolining stubs 473 if( C->save_argument_registers() ) 474 for( i = 0; i < _last_Mach_Reg; i++ ) 475 if( is_spillable_arg(i) ) 476 soe_cnt++; 477 478 // Input RegMask array shared by all Returns. 479 // The type for doubles and longs has a count of 2, but 480 // there is only 1 returned value 481 uint ret_edge_cnt = TypeFunc::Parms + ((C->tf()->range()->cnt() == TypeFunc::Parms) ? 0 : 1); 482 RegMask *ret_rms = init_input_masks( ret_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); 483 // Returns have 0 or 1 returned values depending on call signature. 484 // Return register is specified by return_value in the AD file. 485 if (ret_edge_cnt > TypeFunc::Parms) 486 ret_rms[TypeFunc::Parms+0] = _return_value_mask; 487 488 // Input RegMask array shared by all Rethrows. 489 uint reth_edge_cnt = TypeFunc::Parms+1; 490 RegMask *reth_rms = init_input_masks( reth_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); 491 // Rethrow takes exception oop only, but in the argument 0 slot. 492 reth_rms[TypeFunc::Parms] = mreg2regmask[find_receiver(false)]; 493#ifdef _LP64 494 // Need two slots for ptrs in 64-bit land 495 reth_rms[TypeFunc::Parms].Insert(OptoReg::add(OptoReg::Name(find_receiver(false)),1)); 496#endif 497 498 // Input RegMask array shared by all TailCalls 499 uint tail_call_edge_cnt = TypeFunc::Parms+2; 500 RegMask *tail_call_rms = init_input_masks( tail_call_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); 501 502 // Input RegMask array shared by all TailJumps 503 uint tail_jump_edge_cnt = TypeFunc::Parms+2; 504 RegMask *tail_jump_rms = init_input_masks( tail_jump_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); 505 506 // TailCalls have 2 returned values (target & moop), whose masks come 507 // from the usual MachNode/MachOper mechanism. Find a sample 508 // TailCall to extract these masks and put the correct masks into 509 // the tail_call_rms array. 510 for( i=1; i < root->req(); i++ ) { 511 MachReturnNode *m = root->in(i)->as_MachReturn(); 512 if( m->ideal_Opcode() == Op_TailCall ) { 513 tail_call_rms[TypeFunc::Parms+0] = m->MachNode::in_RegMask(TypeFunc::Parms+0); 514 tail_call_rms[TypeFunc::Parms+1] = m->MachNode::in_RegMask(TypeFunc::Parms+1); 515 break; 516 } 517 } 518 519 // TailJumps have 2 returned values (target & ex_oop), whose masks come 520 // from the usual MachNode/MachOper mechanism. Find a sample 521 // TailJump to extract these masks and put the correct masks into 522 // the tail_jump_rms array. 523 for( i=1; i < root->req(); i++ ) { 524 MachReturnNode *m = root->in(i)->as_MachReturn(); 525 if( m->ideal_Opcode() == Op_TailJump ) { 526 tail_jump_rms[TypeFunc::Parms+0] = m->MachNode::in_RegMask(TypeFunc::Parms+0); 527 tail_jump_rms[TypeFunc::Parms+1] = m->MachNode::in_RegMask(TypeFunc::Parms+1); 528 break; 529 } 530 } 531 532 // Input RegMask array shared by all Halts 533 uint halt_edge_cnt = TypeFunc::Parms; 534 RegMask *halt_rms = init_input_masks( halt_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); 535 536 // Capture the return input masks into each exit flavor 537 for( i=1; i < root->req(); i++ ) { 538 MachReturnNode *exit = root->in(i)->as_MachReturn(); 539 switch( exit->ideal_Opcode() ) { 540 case Op_Return : exit->_in_rms = ret_rms; break; 541 case Op_Rethrow : exit->_in_rms = reth_rms; break; 542 case Op_TailCall : exit->_in_rms = tail_call_rms; break; 543 case Op_TailJump : exit->_in_rms = tail_jump_rms; break; 544 case Op_Halt : exit->_in_rms = halt_rms; break; 545 default : ShouldNotReachHere(); 546 } 547 } 548 549 // Next unused projection number from Start. 550 int proj_cnt = C->tf()->domain()->cnt(); 551 552 // Do all the save-on-entry registers. Make projections from Start for 553 // them, and give them a use at the exit points. To the allocator, they 554 // look like incoming register arguments. 555 for( i = 0; i < _last_Mach_Reg; i++ ) { 556 if( is_save_on_entry(i) ) { 557 558 // Add the save-on-entry to the mask array 559 ret_rms [ ret_edge_cnt] = mreg2regmask[i]; 560 reth_rms [ reth_edge_cnt] = mreg2regmask[i]; 561 tail_call_rms[tail_call_edge_cnt] = mreg2regmask[i]; 562 tail_jump_rms[tail_jump_edge_cnt] = mreg2regmask[i]; 563 // Halts need the SOE registers, but only in the stack as debug info. 564 // A just-prior uncommon-trap or deoptimization will use the SOE regs. 565 halt_rms [ halt_edge_cnt] = *idealreg2spillmask[_register_save_type[i]]; 566 567 Node *mproj; 568 569 // Is this a RegF low half of a RegD? Double up 2 adjacent RegF's 570 // into a single RegD. 571 if( (i&1) == 0 && 572 _register_save_type[i ] == Op_RegF && 573 _register_save_type[i+1] == Op_RegF && 574 is_save_on_entry(i+1) ) { 575 // Add other bit for double 576 ret_rms [ ret_edge_cnt].Insert(OptoReg::Name(i+1)); 577 reth_rms [ reth_edge_cnt].Insert(OptoReg::Name(i+1)); 578 tail_call_rms[tail_call_edge_cnt].Insert(OptoReg::Name(i+1)); 579 tail_jump_rms[tail_jump_edge_cnt].Insert(OptoReg::Name(i+1)); 580 halt_rms [ halt_edge_cnt].Insert(OptoReg::Name(i+1)); 581 mproj = new (C, 1) MachProjNode( start, proj_cnt, ret_rms[ret_edge_cnt], Op_RegD ); 582 proj_cnt += 2; // Skip 2 for doubles 583 } 584 else if( (i&1) == 1 && // Else check for high half of double 585 _register_save_type[i-1] == Op_RegF && 586 _register_save_type[i ] == Op_RegF && 587 is_save_on_entry(i-1) ) { 588 ret_rms [ ret_edge_cnt] = RegMask::Empty; 589 reth_rms [ reth_edge_cnt] = RegMask::Empty; 590 tail_call_rms[tail_call_edge_cnt] = RegMask::Empty; 591 tail_jump_rms[tail_jump_edge_cnt] = RegMask::Empty; 592 halt_rms [ halt_edge_cnt] = RegMask::Empty; 593 mproj = C->top(); 594 } 595 // Is this a RegI low half of a RegL? Double up 2 adjacent RegI's 596 // into a single RegL. 597 else if( (i&1) == 0 && 598 _register_save_type[i ] == Op_RegI && 599 _register_save_type[i+1] == Op_RegI && 600 is_save_on_entry(i+1) ) { 601 // Add other bit for long 602 ret_rms [ ret_edge_cnt].Insert(OptoReg::Name(i+1)); 603 reth_rms [ reth_edge_cnt].Insert(OptoReg::Name(i+1)); 604 tail_call_rms[tail_call_edge_cnt].Insert(OptoReg::Name(i+1)); 605 tail_jump_rms[tail_jump_edge_cnt].Insert(OptoReg::Name(i+1)); 606 halt_rms [ halt_edge_cnt].Insert(OptoReg::Name(i+1)); 607 mproj = new (C, 1) MachProjNode( start, proj_cnt, ret_rms[ret_edge_cnt], Op_RegL ); 608 proj_cnt += 2; // Skip 2 for longs 609 } 610 else if( (i&1) == 1 && // Else check for high half of long 611 _register_save_type[i-1] == Op_RegI && 612 _register_save_type[i ] == Op_RegI && 613 is_save_on_entry(i-1) ) { 614 ret_rms [ ret_edge_cnt] = RegMask::Empty; 615 reth_rms [ reth_edge_cnt] = RegMask::Empty; 616 tail_call_rms[tail_call_edge_cnt] = RegMask::Empty; 617 tail_jump_rms[tail_jump_edge_cnt] = RegMask::Empty; 618 halt_rms [ halt_edge_cnt] = RegMask::Empty; 619 mproj = C->top(); 620 } else { 621 // Make a projection for it off the Start 622 mproj = new (C, 1) MachProjNode( start, proj_cnt++, ret_rms[ret_edge_cnt], _register_save_type[i] ); 623 } 624 625 ret_edge_cnt ++; 626 reth_edge_cnt ++; 627 tail_call_edge_cnt ++; 628 tail_jump_edge_cnt ++; 629 halt_edge_cnt ++; 630 631 // Add a use of the SOE register to all exit paths 632 for( uint j=1; j < root->req(); j++ ) 633 root->in(j)->add_req(mproj); 634 } // End of if a save-on-entry register 635 } // End of for all machine registers 636} 637 638//------------------------------init_spill_mask-------------------------------- 639void Matcher::init_spill_mask( Node *ret ) { 640 if( idealreg2regmask[Op_RegI] ) return; // One time only init 641 642 OptoReg::c_frame_pointer = c_frame_pointer(); 643 c_frame_ptr_mask = c_frame_pointer(); 644#ifdef _LP64 645 // pointers are twice as big 646 c_frame_ptr_mask.Insert(OptoReg::add(c_frame_pointer(),1)); 647#endif 648 649 // Start at OptoReg::stack0() 650 STACK_ONLY_mask.Clear(); 651 OptoReg::Name init = OptoReg::stack2reg(0); 652 // STACK_ONLY_mask is all stack bits 653 OptoReg::Name i; 654 for (i = init; RegMask::can_represent(i); i = OptoReg::add(i,1)) 655 STACK_ONLY_mask.Insert(i); 656 // Also set the "infinite stack" bit. 657 STACK_ONLY_mask.set_AllStack(); 658 659 // Copy the register names over into the shared world 660 for( i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) { 661 // SharedInfo::regName[i] = regName[i]; 662 // Handy RegMasks per machine register 663 mreg2regmask[i].Insert(i); 664 } 665 666 // Grab the Frame Pointer 667 Node *fp = ret->in(TypeFunc::FramePtr); 668 Node *mem = ret->in(TypeFunc::Memory); 669 const TypePtr* atp = TypePtr::BOTTOM; 670 // Share frame pointer while making spill ops 671 set_shared(fp); 672 673 // Compute generic short-offset Loads 674#ifdef _LP64 675 MachNode *spillCP = match_tree(new (C, 3) LoadNNode(NULL,mem,fp,atp,TypeInstPtr::BOTTOM)); 676#endif 677 MachNode *spillI = match_tree(new (C, 3) LoadINode(NULL,mem,fp,atp)); 678 MachNode *spillL = match_tree(new (C, 3) LoadLNode(NULL,mem,fp,atp)); 679 MachNode *spillF = match_tree(new (C, 3) LoadFNode(NULL,mem,fp,atp)); 680 MachNode *spillD = match_tree(new (C, 3) LoadDNode(NULL,mem,fp,atp)); 681 MachNode *spillP = match_tree(new (C, 3) LoadPNode(NULL,mem,fp,atp,TypeInstPtr::BOTTOM)); 682 assert(spillI != NULL && spillL != NULL && spillF != NULL && 683 spillD != NULL && spillP != NULL, ""); 684 685 // Get the ADLC notion of the right regmask, for each basic type. 686#ifdef _LP64 687 idealreg2regmask[Op_RegN] = &spillCP->out_RegMask(); 688#endif 689 idealreg2regmask[Op_RegI] = &spillI->out_RegMask(); 690 idealreg2regmask[Op_RegL] = &spillL->out_RegMask(); 691 idealreg2regmask[Op_RegF] = &spillF->out_RegMask(); 692 idealreg2regmask[Op_RegD] = &spillD->out_RegMask(); 693 idealreg2regmask[Op_RegP] = &spillP->out_RegMask(); 694} 695 696#ifdef ASSERT 697static void match_alias_type(Compile* C, Node* n, Node* m) { 698 if (!VerifyAliases) return; // do not go looking for trouble by default 699 const TypePtr* nat = n->adr_type(); 700 const TypePtr* mat = m->adr_type(); 701 int nidx = C->get_alias_index(nat); 702 int midx = C->get_alias_index(mat); 703 // Detune the assert for cases like (AndI 0xFF (LoadB p)). 704 if (nidx == Compile::AliasIdxTop && midx >= Compile::AliasIdxRaw) { 705 for (uint i = 1; i < n->req(); i++) { 706 Node* n1 = n->in(i); 707 const TypePtr* n1at = n1->adr_type(); 708 if (n1at != NULL) { 709 nat = n1at; 710 nidx = C->get_alias_index(n1at); 711 } 712 } 713 } 714 // %%% Kludgery. Instead, fix ideal adr_type methods for all these cases: 715 if (nidx == Compile::AliasIdxTop && midx == Compile::AliasIdxRaw) { 716 switch (n->Opcode()) { 717 case Op_PrefetchRead: 718 case Op_PrefetchWrite: 719 nidx = Compile::AliasIdxRaw; 720 nat = TypeRawPtr::BOTTOM; 721 break; 722 } 723 } 724 if (nidx == Compile::AliasIdxRaw && midx == Compile::AliasIdxTop) { 725 switch (n->Opcode()) { 726 case Op_ClearArray: 727 midx = Compile::AliasIdxRaw; 728 mat = TypeRawPtr::BOTTOM; 729 break; 730 } 731 } 732 if (nidx == Compile::AliasIdxTop && midx == Compile::AliasIdxBot) { 733 switch (n->Opcode()) { 734 case Op_Return: 735 case Op_Rethrow: 736 case Op_Halt: 737 case Op_TailCall: 738 case Op_TailJump: 739 nidx = Compile::AliasIdxBot; 740 nat = TypePtr::BOTTOM; 741 break; 742 } 743 } 744 if (nidx == Compile::AliasIdxBot && midx == Compile::AliasIdxTop) { 745 switch (n->Opcode()) { 746 case Op_StrComp: 747 case Op_MemBarVolatile: 748 case Op_MemBarCPUOrder: // %%% these ideals should have narrower adr_type? 749 nidx = Compile::AliasIdxTop; 750 nat = NULL; 751 break; 752 } 753 } 754 if (nidx != midx) { 755 if (PrintOpto || (PrintMiscellaneous && (WizardMode || Verbose))) { 756 tty->print_cr("==== Matcher alias shift %d => %d", nidx, midx); 757 n->dump(); 758 m->dump(); 759 } 760 assert(C->subsume_loads() && C->must_alias(nat, midx), 761 "must not lose alias info when matching"); 762 } 763} 764#endif 765 766 767//------------------------------MStack----------------------------------------- 768// State and MStack class used in xform() and find_shared() iterative methods. 769enum Node_State { Pre_Visit, // node has to be pre-visited 770 Visit, // visit node 771 Post_Visit, // post-visit node 772 Alt_Post_Visit // alternative post-visit path 773 }; 774 775class MStack: public Node_Stack { 776 public: 777 MStack(int size) : Node_Stack(size) { } 778 779 void push(Node *n, Node_State ns) { 780 Node_Stack::push(n, (uint)ns); 781 } 782 void push(Node *n, Node_State ns, Node *parent, int indx) { 783 ++_inode_top; 784 if ((_inode_top + 1) >= _inode_max) grow(); 785 _inode_top->node = parent; 786 _inode_top->indx = (uint)indx; 787 ++_inode_top; 788 _inode_top->node = n; 789 _inode_top->indx = (uint)ns; 790 } 791 Node *parent() { 792 pop(); 793 return node(); 794 } 795 Node_State state() const { 796 return (Node_State)index(); 797 } 798 void set_state(Node_State ns) { 799 set_index((uint)ns); 800 } 801}; 802 803 804//------------------------------xform------------------------------------------ 805// Given a Node in old-space, Match him (Label/Reduce) to produce a machine 806// Node in new-space. Given a new-space Node, recursively walk his children. 807Node *Matcher::transform( Node *n ) { ShouldNotCallThis(); return n; } 808Node *Matcher::xform( Node *n, int max_stack ) { 809 // Use one stack to keep both: child's node/state and parent's node/index 810 MStack mstack(max_stack * 2 * 2); // C->unique() * 2 * 2 811 mstack.push(n, Visit, NULL, -1); // set NULL as parent to indicate root 812 813 while (mstack.is_nonempty()) { 814 n = mstack.node(); // Leave node on stack 815 Node_State nstate = mstack.state(); 816 if (nstate == Visit) { 817 mstack.set_state(Post_Visit); 818 Node *oldn = n; 819 // Old-space or new-space check 820 if (!C->node_arena()->contains(n)) { 821 // Old space! 822 Node* m; 823 if (has_new_node(n)) { // Not yet Label/Reduced 824 m = new_node(n); 825 } else { 826 if (!is_dontcare(n)) { // Matcher can match this guy 827 // Calls match special. They match alone with no children. 828 // Their children, the incoming arguments, match normally. 829 m = n->is_SafePoint() ? match_sfpt(n->as_SafePoint()):match_tree(n); 830 if (C->failing()) return NULL; 831 if (m == NULL) { Matcher::soft_match_failure(); return NULL; } 832 } else { // Nothing the matcher cares about 833 if( n->is_Proj() && n->in(0)->is_Multi()) { // Projections? 834 // Convert to machine-dependent projection 835 m = n->in(0)->as_Multi()->match( n->as_Proj(), this ); 836 if (m->in(0) != NULL) // m might be top 837 collect_null_checks(m); 838 } else { // Else just a regular 'ol guy 839 m = n->clone(); // So just clone into new-space 840 // Def-Use edges will be added incrementally as Uses 841 // of this node are matched. 842 assert(m->outcnt() == 0, "no Uses of this clone yet"); 843 } 844 } 845 846 set_new_node(n, m); // Map old to new 847 if (_old_node_note_array != NULL) { 848 Node_Notes* nn = C->locate_node_notes(_old_node_note_array, 849 n->_idx); 850 C->set_node_notes_at(m->_idx, nn); 851 } 852 debug_only(match_alias_type(C, n, m)); 853 } 854 n = m; // n is now a new-space node 855 mstack.set_node(n); 856 } 857 858 // New space! 859 if (_visited.test_set(n->_idx)) continue; // while(mstack.is_nonempty()) 860 861 int i; 862 // Put precedence edges on stack first (match them last). 863 for (i = oldn->req(); (uint)i < oldn->len(); i++) { 864 Node *m = oldn->in(i); 865 if (m == NULL) break; 866 // set -1 to call add_prec() instead of set_req() during Step1 867 mstack.push(m, Visit, n, -1); 868 } 869 870 // For constant debug info, I'd rather have unmatched constants. 871 int cnt = n->req(); 872 JVMState* jvms = n->jvms(); 873 int debug_cnt = jvms ? jvms->debug_start() : cnt; 874 875 // Now do only debug info. Clone constants rather than matching. 876 // Constants are represented directly in the debug info without 877 // the need for executable machine instructions. 878 // Monitor boxes are also represented directly. 879 for (i = cnt - 1; i >= debug_cnt; --i) { // For all debug inputs do 880 Node *m = n->in(i); // Get input 881 int op = m->Opcode(); 882 assert((op == Op_BoxLock) == jvms->is_monitor_use(i), "boxes only at monitor sites"); 883 if( op == Op_ConI || op == Op_ConP || op == Op_ConN || 884 op == Op_ConF || op == Op_ConD || op == Op_ConL 885 // || op == Op_BoxLock // %%%% enable this and remove (+++) in chaitin.cpp 886 ) { 887 m = m->clone(); 888 mstack.push(m, Post_Visit, n, i); // Don't neet to visit 889 mstack.push(m->in(0), Visit, m, 0); 890 } else { 891 mstack.push(m, Visit, n, i); 892 } 893 } 894 895 // And now walk his children, and convert his inputs to new-space. 896 for( ; i >= 0; --i ) { // For all normal inputs do 897 Node *m = n->in(i); // Get input 898 if(m != NULL) 899 mstack.push(m, Visit, n, i); 900 } 901 902 } 903 else if (nstate == Post_Visit) { 904 // Set xformed input 905 Node *p = mstack.parent(); 906 if (p != NULL) { // root doesn't have parent 907 int i = (int)mstack.index(); 908 if (i >= 0) 909 p->set_req(i, n); // required input 910 else if (i == -1) 911 p->add_prec(n); // precedence input 912 else 913 ShouldNotReachHere(); 914 } 915 mstack.pop(); // remove processed node from stack 916 } 917 else { 918 ShouldNotReachHere(); 919 } 920 } // while (mstack.is_nonempty()) 921 return n; // Return new-space Node 922} 923 924//------------------------------warp_outgoing_stk_arg------------------------ 925OptoReg::Name Matcher::warp_outgoing_stk_arg( VMReg reg, OptoReg::Name begin_out_arg_area, OptoReg::Name &out_arg_limit_per_call ) { 926 // Convert outgoing argument location to a pre-biased stack offset 927 if (reg->is_stack()) { 928 OptoReg::Name warped = reg->reg2stack(); 929 // Adjust the stack slot offset to be the register number used 930 // by the allocator. 931 warped = OptoReg::add(begin_out_arg_area, warped); 932 // Keep track of the largest numbered stack slot used for an arg. 933 // Largest used slot per call-site indicates the amount of stack 934 // that is killed by the call. 935 if( warped >= out_arg_limit_per_call ) 936 out_arg_limit_per_call = OptoReg::add(warped,1); 937 if (!RegMask::can_represent(warped)) { 938 C->record_method_not_compilable_all_tiers("unsupported calling sequence"); 939 return OptoReg::Bad; 940 } 941 return warped; 942 } 943 return OptoReg::as_OptoReg(reg); 944} 945 946 947//------------------------------match_sfpt------------------------------------- 948// Helper function to match call instructions. Calls match special. 949// They match alone with no children. Their children, the incoming 950// arguments, match normally. 951MachNode *Matcher::match_sfpt( SafePointNode *sfpt ) { 952 MachSafePointNode *msfpt = NULL; 953 MachCallNode *mcall = NULL; 954 uint cnt; 955 // Split out case for SafePoint vs Call 956 CallNode *call; 957 const TypeTuple *domain; 958 ciMethod* method = NULL; 959 if( sfpt->is_Call() ) { 960 call = sfpt->as_Call(); 961 domain = call->tf()->domain(); 962 cnt = domain->cnt(); 963 964 // Match just the call, nothing else 965 MachNode *m = match_tree(call); 966 if (C->failing()) return NULL; 967 if( m == NULL ) { Matcher::soft_match_failure(); return NULL; } 968 969 // Copy data from the Ideal SafePoint to the machine version 970 mcall = m->as_MachCall(); 971 972 mcall->set_tf( call->tf()); 973 mcall->set_entry_point(call->entry_point()); 974 mcall->set_cnt( call->cnt()); 975 976 if( mcall->is_MachCallJava() ) { 977 MachCallJavaNode *mcall_java = mcall->as_MachCallJava(); 978 const CallJavaNode *call_java = call->as_CallJava(); 979 method = call_java->method(); 980 mcall_java->_method = method; 981 mcall_java->_bci = call_java->_bci; 982 mcall_java->_optimized_virtual = call_java->is_optimized_virtual(); 983 if( mcall_java->is_MachCallStaticJava() ) 984 mcall_java->as_MachCallStaticJava()->_name = 985 call_java->as_CallStaticJava()->_name; 986 if( mcall_java->is_MachCallDynamicJava() ) 987 mcall_java->as_MachCallDynamicJava()->_vtable_index = 988 call_java->as_CallDynamicJava()->_vtable_index; 989 } 990 else if( mcall->is_MachCallRuntime() ) { 991 mcall->as_MachCallRuntime()->_name = call->as_CallRuntime()->_name; 992 } 993 msfpt = mcall; 994 } 995 // This is a non-call safepoint 996 else { 997 call = NULL; 998 domain = NULL; 999 MachNode *mn = match_tree(sfpt); 1000 if (C->failing()) return NULL; 1001 msfpt = mn->as_MachSafePoint(); 1002 cnt = TypeFunc::Parms; 1003 } 1004 1005 // Advertise the correct memory effects (for anti-dependence computation). 1006 msfpt->set_adr_type(sfpt->adr_type()); 1007 1008 // Allocate a private array of RegMasks. These RegMasks are not shared. 1009 msfpt->_in_rms = NEW_RESOURCE_ARRAY( RegMask, cnt ); 1010 // Empty them all. 1011 memset( msfpt->_in_rms, 0, sizeof(RegMask)*cnt ); 1012 1013 // Do all the pre-defined non-Empty register masks 1014 msfpt->_in_rms[TypeFunc::ReturnAdr] = _return_addr_mask; 1015 msfpt->_in_rms[TypeFunc::FramePtr ] = c_frame_ptr_mask; 1016 1017 // Place first outgoing argument can possibly be put. 1018 OptoReg::Name begin_out_arg_area = OptoReg::add(_new_SP, C->out_preserve_stack_slots()); 1019 assert( is_even(begin_out_arg_area), "" ); 1020 // Compute max outgoing register number per call site. 1021 OptoReg::Name out_arg_limit_per_call = begin_out_arg_area; 1022 // Calls to C may hammer extra stack slots above and beyond any arguments. 1023 // These are usually backing store for register arguments for varargs. 1024 if( call != NULL && call->is_CallRuntime() ) 1025 out_arg_limit_per_call = OptoReg::add(out_arg_limit_per_call,C->varargs_C_out_slots_killed()); 1026 1027 1028 // Do the normal argument list (parameters) register masks 1029 int argcnt = cnt - TypeFunc::Parms; 1030 if( argcnt > 0 ) { // Skip it all if we have no args 1031 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, argcnt ); 1032 VMRegPair *parm_regs = NEW_RESOURCE_ARRAY( VMRegPair, argcnt ); 1033 int i; 1034 for( i = 0; i < argcnt; i++ ) { 1035 sig_bt[i] = domain->field_at(i+TypeFunc::Parms)->basic_type(); 1036 } 1037 // V-call to pick proper calling convention 1038 call->calling_convention( sig_bt, parm_regs, argcnt ); 1039 1040#ifdef ASSERT 1041 // Sanity check users' calling convention. Really handy during 1042 // the initial porting effort. Fairly expensive otherwise. 1043 { for (int i = 0; i<argcnt; i++) { 1044 if( !parm_regs[i].first()->is_valid() && 1045 !parm_regs[i].second()->is_valid() ) continue; 1046 VMReg reg1 = parm_regs[i].first(); 1047 VMReg reg2 = parm_regs[i].second(); 1048 for (int j = 0; j < i; j++) { 1049 if( !parm_regs[j].first()->is_valid() && 1050 !parm_regs[j].second()->is_valid() ) continue; 1051 VMReg reg3 = parm_regs[j].first(); 1052 VMReg reg4 = parm_regs[j].second(); 1053 if( !reg1->is_valid() ) { 1054 assert( !reg2->is_valid(), "valid halvsies" ); 1055 } else if( !reg3->is_valid() ) { 1056 assert( !reg4->is_valid(), "valid halvsies" ); 1057 } else { 1058 assert( reg1 != reg2, "calling conv. must produce distinct regs"); 1059 assert( reg1 != reg3, "calling conv. must produce distinct regs"); 1060 assert( reg1 != reg4, "calling conv. must produce distinct regs"); 1061 assert( reg2 != reg3, "calling conv. must produce distinct regs"); 1062 assert( reg2 != reg4 || !reg2->is_valid(), "calling conv. must produce distinct regs"); 1063 assert( reg3 != reg4, "calling conv. must produce distinct regs"); 1064 } 1065 } 1066 } 1067 } 1068#endif 1069 1070 // Visit each argument. Compute its outgoing register mask. 1071 // Return results now can have 2 bits returned. 1072 // Compute max over all outgoing arguments both per call-site 1073 // and over the entire method. 1074 for( i = 0; i < argcnt; i++ ) { 1075 // Address of incoming argument mask to fill in 1076 RegMask *rm = &mcall->_in_rms[i+TypeFunc::Parms]; 1077 if( !parm_regs[i].first()->is_valid() && 1078 !parm_regs[i].second()->is_valid() ) { 1079 continue; // Avoid Halves 1080 } 1081 // Grab first register, adjust stack slots and insert in mask. 1082 OptoReg::Name reg1 = warp_outgoing_stk_arg(parm_regs[i].first(), begin_out_arg_area, out_arg_limit_per_call ); 1083 if (OptoReg::is_valid(reg1)) 1084 rm->Insert( reg1 ); 1085 // Grab second register (if any), adjust stack slots and insert in mask. 1086 OptoReg::Name reg2 = warp_outgoing_stk_arg(parm_regs[i].second(), begin_out_arg_area, out_arg_limit_per_call ); 1087 if (OptoReg::is_valid(reg2)) 1088 rm->Insert( reg2 ); 1089 } // End of for all arguments 1090 1091 // Compute number of stack slots needed to restore stack in case of 1092 // Pascal-style argument popping. 1093 mcall->_argsize = out_arg_limit_per_call - begin_out_arg_area; 1094 } 1095 1096 // Compute the max stack slot killed by any call. These will not be 1097 // available for debug info, and will be used to adjust FIRST_STACK_mask 1098 // after all call sites have been visited. 1099 if( _out_arg_limit < out_arg_limit_per_call) 1100 _out_arg_limit = out_arg_limit_per_call; 1101 1102 if (mcall) { 1103 // Kill the outgoing argument area, including any non-argument holes and 1104 // any legacy C-killed slots. Use Fat-Projections to do the killing. 1105 // Since the max-per-method covers the max-per-call-site and debug info 1106 // is excluded on the max-per-method basis, debug info cannot land in 1107 // this killed area. 1108 uint r_cnt = mcall->tf()->range()->cnt(); 1109 MachProjNode *proj = new (C, 1) MachProjNode( mcall, r_cnt+10000, RegMask::Empty, MachProjNode::fat_proj ); 1110 if (!RegMask::can_represent(OptoReg::Name(out_arg_limit_per_call-1))) { 1111 C->record_method_not_compilable_all_tiers("unsupported outgoing calling sequence"); 1112 } else { 1113 for (int i = begin_out_arg_area; i < out_arg_limit_per_call; i++) 1114 proj->_rout.Insert(OptoReg::Name(i)); 1115 } 1116 if( proj->_rout.is_NotEmpty() ) 1117 _proj_list.push(proj); 1118 } 1119 // Transfer the safepoint information from the call to the mcall 1120 // Move the JVMState list 1121 msfpt->set_jvms(sfpt->jvms()); 1122 for (JVMState* jvms = msfpt->jvms(); jvms; jvms = jvms->caller()) { 1123 jvms->set_map(sfpt); 1124 } 1125 1126 // Debug inputs begin just after the last incoming parameter 1127 assert( (mcall == NULL) || (mcall->jvms() == NULL) || 1128 (mcall->jvms()->debug_start() + mcall->_jvmadj == mcall->tf()->domain()->cnt()), "" ); 1129 1130 // Move the OopMap 1131 msfpt->_oop_map = sfpt->_oop_map; 1132 1133 // Registers killed by the call are set in the local scheduling pass 1134 // of Global Code Motion. 1135 return msfpt; 1136} 1137 1138//---------------------------match_tree---------------------------------------- 1139// Match a Ideal Node DAG - turn it into a tree; Label & Reduce. Used as part 1140// of the whole-sale conversion from Ideal to Mach Nodes. Also used for 1141// making GotoNodes while building the CFG and in init_spill_mask() to identify 1142// a Load's result RegMask for memoization in idealreg2regmask[] 1143MachNode *Matcher::match_tree( const Node *n ) { 1144 assert( n->Opcode() != Op_Phi, "cannot match" ); 1145 assert( !n->is_block_start(), "cannot match" ); 1146 // Set the mark for all locally allocated State objects. 1147 // When this call returns, the _states_arena arena will be reset 1148 // freeing all State objects. 1149 ResourceMark rm( &_states_arena ); 1150 1151 LabelRootDepth = 0; 1152 1153 // StoreNodes require their Memory input to match any LoadNodes 1154 Node *mem = n->is_Store() ? n->in(MemNode::Memory) : (Node*)1 ; 1155 1156 // State object for root node of match tree 1157 // Allocate it on _states_arena - stack allocation can cause stack overflow. 1158 State *s = new (&_states_arena) State; 1159 s->_kids[0] = NULL; 1160 s->_kids[1] = NULL; 1161 s->_leaf = (Node*)n; 1162 // Label the input tree, allocating labels from top-level arena 1163 Label_Root( n, s, n->in(0), mem ); 1164 if (C->failing()) return NULL; 1165 1166 // The minimum cost match for the whole tree is found at the root State 1167 uint mincost = max_juint; 1168 uint cost = max_juint; 1169 uint i; 1170 for( i = 0; i < NUM_OPERANDS; i++ ) { 1171 if( s->valid(i) && // valid entry and 1172 s->_cost[i] < cost && // low cost and 1173 s->_rule[i] >= NUM_OPERANDS ) // not an operand 1174 cost = s->_cost[mincost=i]; 1175 } 1176 if (mincost == max_juint) { 1177#ifndef PRODUCT 1178 tty->print("No matching rule for:"); 1179 s->dump(); 1180#endif 1181 Matcher::soft_match_failure(); 1182 return NULL; 1183 } 1184 // Reduce input tree based upon the state labels to machine Nodes 1185 MachNode *m = ReduceInst( s, s->_rule[mincost], mem ); 1186#ifdef ASSERT 1187 _old2new_map.map(n->_idx, m); 1188#endif 1189 1190 // Add any Matcher-ignored edges 1191 uint cnt = n->req(); 1192 uint start = 1; 1193 if( mem != (Node*)1 ) start = MemNode::Memory+1; 1194 if( n->Opcode() == Op_AddP ) { 1195 assert( mem == (Node*)1, "" ); 1196 start = AddPNode::Base+1; 1197 } 1198 for( i = start; i < cnt; i++ ) { 1199 if( !n->match_edge(i) ) { 1200 if( i < m->req() ) 1201 m->ins_req( i, n->in(i) ); 1202 else 1203 m->add_req( n->in(i) ); 1204 } 1205 } 1206 1207 return m; 1208} 1209 1210 1211//------------------------------match_into_reg--------------------------------- 1212// Choose to either match this Node in a register or part of the current 1213// match tree. Return true for requiring a register and false for matching 1214// as part of the current match tree. 1215static bool match_into_reg( const Node *n, Node *m, Node *control, int i, bool shared ) { 1216 1217 const Type *t = m->bottom_type(); 1218 1219 if( t->singleton() ) { 1220 // Never force constants into registers. Allow them to match as 1221 // constants or registers. Copies of the same value will share 1222 // the same register. See find_shared_constant. 1223 return false; 1224 } else { // Not a constant 1225 // Stop recursion if they have different Controls. 1226 // Slot 0 of constants is not really a Control. 1227 if( control && m->in(0) && control != m->in(0) ) { 1228 1229 // Actually, we can live with the most conservative control we 1230 // find, if it post-dominates the others. This allows us to 1231 // pick up load/op/store trees where the load can float a little 1232 // above the store. 1233 Node *x = control; 1234 const uint max_scan = 6; // Arbitrary scan cutoff 1235 uint j; 1236 for( j=0; j<max_scan; j++ ) { 1237 if( x->is_Region() ) // Bail out at merge points 1238 return true; 1239 x = x->in(0); 1240 if( x == m->in(0) ) // Does 'control' post-dominate 1241 break; // m->in(0)? If so, we can use it 1242 } 1243 if( j == max_scan ) // No post-domination before scan end? 1244 return true; // Then break the match tree up 1245 } 1246 1247 if (m->Opcode() == Op_DecodeN && m->outcnt() == 2) { 1248 // These are commonly used in address expressions and can 1249 // efficiently fold into them in some cases but because they are 1250 // consumed by AddP they commonly have two users. 1251 if (m->raw_out(0) == m->raw_out(1) && m->raw_out(0)->Opcode() == Op_AddP) return false; 1252 } 1253 } 1254 1255 // Not forceably cloning. If shared, put it into a register. 1256 return shared; 1257} 1258 1259 1260//------------------------------Instruction Selection-------------------------- 1261// Label method walks a "tree" of nodes, using the ADLC generated DFA to match 1262// ideal nodes to machine instructions. Trees are delimited by shared Nodes, 1263// things the Matcher does not match (e.g., Memory), and things with different 1264// Controls (hence forced into different blocks). We pass in the Control 1265// selected for this entire State tree. 1266 1267// The Matcher works on Trees, but an Intel add-to-memory requires a DAG: the 1268// Store and the Load must have identical Memories (as well as identical 1269// pointers). Since the Matcher does not have anything for Memory (and 1270// does not handle DAGs), I have to match the Memory input myself. If the 1271// Tree root is a Store, I require all Loads to have the identical memory. 1272Node *Matcher::Label_Root( const Node *n, State *svec, Node *control, const Node *mem){ 1273 // Since Label_Root is a recursive function, its possible that we might run 1274 // out of stack space. See bugs 6272980 & 6227033 for more info. 1275 LabelRootDepth++; 1276 if (LabelRootDepth > MaxLabelRootDepth) { 1277 C->record_method_not_compilable_all_tiers("Out of stack space, increase MaxLabelRootDepth"); 1278 return NULL; 1279 } 1280 uint care = 0; // Edges matcher cares about 1281 uint cnt = n->req(); 1282 uint i = 0; 1283 1284 // Examine children for memory state 1285 // Can only subsume a child into your match-tree if that child's memory state 1286 // is not modified along the path to another input. 1287 // It is unsafe even if the other inputs are separate roots. 1288 Node *input_mem = NULL; 1289 for( i = 1; i < cnt; i++ ) { 1290 if( !n->match_edge(i) ) continue; 1291 Node *m = n->in(i); // Get ith input 1292 assert( m, "expect non-null children" ); 1293 if( m->is_Load() ) { 1294 if( input_mem == NULL ) { 1295 input_mem = m->in(MemNode::Memory); 1296 } else if( input_mem != m->in(MemNode::Memory) ) { 1297 input_mem = NodeSentinel; 1298 } 1299 } 1300 } 1301 1302 for( i = 1; i < cnt; i++ ){// For my children 1303 if( !n->match_edge(i) ) continue; 1304 Node *m = n->in(i); // Get ith input 1305 // Allocate states out of a private arena 1306 State *s = new (&_states_arena) State; 1307 svec->_kids[care++] = s; 1308 assert( care <= 2, "binary only for now" ); 1309 1310 // Recursively label the State tree. 1311 s->_kids[0] = NULL; 1312 s->_kids[1] = NULL; 1313 s->_leaf = m; 1314 1315 // Check for leaves of the State Tree; things that cannot be a part of 1316 // the current tree. If it finds any, that value is matched as a 1317 // register operand. If not, then the normal matching is used. 1318 if( match_into_reg(n, m, control, i, is_shared(m)) || 1319 // 1320 // Stop recursion if this is LoadNode and the root of this tree is a 1321 // StoreNode and the load & store have different memories. 1322 ((mem!=(Node*)1) && m->is_Load() && m->in(MemNode::Memory) != mem) || 1323 // Can NOT include the match of a subtree when its memory state 1324 // is used by any of the other subtrees 1325 (input_mem == NodeSentinel) ) { 1326#ifndef PRODUCT 1327 // Print when we exclude matching due to different memory states at input-loads 1328 if( PrintOpto && (Verbose && WizardMode) && (input_mem == NodeSentinel) 1329 && !((mem!=(Node*)1) && m->is_Load() && m->in(MemNode::Memory) != mem) ) { 1330 tty->print_cr("invalid input_mem"); 1331 } 1332#endif 1333 // Switch to a register-only opcode; this value must be in a register 1334 // and cannot be subsumed as part of a larger instruction. 1335 s->DFA( m->ideal_reg(), m ); 1336 1337 } else { 1338 // If match tree has no control and we do, adopt it for entire tree 1339 if( control == NULL && m->in(0) != NULL && m->req() > 1 ) 1340 control = m->in(0); // Pick up control 1341 // Else match as a normal part of the match tree. 1342 control = Label_Root(m,s,control,mem); 1343 if (C->failing()) return NULL; 1344 } 1345 } 1346 1347 1348 // Call DFA to match this node, and return 1349 svec->DFA( n->Opcode(), n ); 1350 1351#ifdef ASSERT 1352 uint x; 1353 for( x = 0; x < _LAST_MACH_OPER; x++ ) 1354 if( svec->valid(x) ) 1355 break; 1356 1357 if (x >= _LAST_MACH_OPER) { 1358 n->dump(); 1359 svec->dump(); 1360 assert( false, "bad AD file" ); 1361 } 1362#endif 1363 return control; 1364} 1365 1366 1367// Con nodes reduced using the same rule can share their MachNode 1368// which reduces the number of copies of a constant in the final 1369// program. The register allocator is free to split uses later to 1370// split live ranges. 1371MachNode* Matcher::find_shared_constant(Node* leaf, uint rule) { 1372 if (!leaf->is_Con()) return NULL; 1373 1374 // See if this Con has already been reduced using this rule. 1375 if (_shared_constants.Size() <= leaf->_idx) return NULL; 1376 MachNode* last = (MachNode*)_shared_constants.at(leaf->_idx); 1377 if (last != NULL && rule == last->rule()) { 1378 // Get the new space root. 1379 Node* xroot = new_node(C->root()); 1380 if (xroot == NULL) { 1381 // This shouldn't happen give the order of matching. 1382 return NULL; 1383 } 1384 1385 // Shared constants need to have their control be root so they 1386 // can be scheduled properly. 1387 Node* control = last->in(0); 1388 if (control != xroot) { 1389 if (control == NULL || control == C->root()) { 1390 last->set_req(0, xroot); 1391 } else { 1392 assert(false, "unexpected control"); 1393 return NULL; 1394 } 1395 } 1396 return last; 1397 } 1398 return NULL; 1399} 1400 1401 1402//------------------------------ReduceInst------------------------------------- 1403// Reduce a State tree (with given Control) into a tree of MachNodes. 1404// This routine (and it's cohort ReduceOper) convert Ideal Nodes into 1405// complicated machine Nodes. Each MachNode covers some tree of Ideal Nodes. 1406// Each MachNode has a number of complicated MachOper operands; each 1407// MachOper also covers a further tree of Ideal Nodes. 1408 1409// The root of the Ideal match tree is always an instruction, so we enter 1410// the recursion here. After building the MachNode, we need to recurse 1411// the tree checking for these cases: 1412// (1) Child is an instruction - 1413// Build the instruction (recursively), add it as an edge. 1414// Build a simple operand (register) to hold the result of the instruction. 1415// (2) Child is an interior part of an instruction - 1416// Skip over it (do nothing) 1417// (3) Child is the start of a operand - 1418// Build the operand, place it inside the instruction 1419// Call ReduceOper. 1420MachNode *Matcher::ReduceInst( State *s, int rule, Node *&mem ) { 1421 assert( rule >= NUM_OPERANDS, "called with operand rule" ); 1422 1423 MachNode* shared_con = find_shared_constant(s->_leaf, rule); 1424 if (shared_con != NULL) { 1425 return shared_con; 1426 } 1427 1428 // Build the object to represent this state & prepare for recursive calls 1429 MachNode *mach = s->MachNodeGenerator( rule, C ); 1430 mach->_opnds[0] = s->MachOperGenerator( _reduceOp[rule], C ); 1431 assert( mach->_opnds[0] != NULL, "Missing result operand" ); 1432 Node *leaf = s->_leaf; 1433 // Check for instruction or instruction chain rule 1434 if( rule >= _END_INST_CHAIN_RULE || rule < _BEGIN_INST_CHAIN_RULE ) { 1435 // Instruction 1436 mach->add_req( leaf->in(0) ); // Set initial control 1437 // Reduce interior of complex instruction 1438 ReduceInst_Interior( s, rule, mem, mach, 1 ); 1439 } else { 1440 // Instruction chain rules are data-dependent on their inputs 1441 mach->add_req(0); // Set initial control to none 1442 ReduceInst_Chain_Rule( s, rule, mem, mach ); 1443 } 1444 1445 // If a Memory was used, insert a Memory edge 1446 if( mem != (Node*)1 ) 1447 mach->ins_req(MemNode::Memory,mem); 1448 1449 // If the _leaf is an AddP, insert the base edge 1450 if( leaf->Opcode() == Op_AddP ) 1451 mach->ins_req(AddPNode::Base,leaf->in(AddPNode::Base)); 1452 1453 uint num_proj = _proj_list.size(); 1454 1455 // Perform any 1-to-many expansions required 1456 MachNode *ex = mach->Expand(s,_proj_list); 1457 if( ex != mach ) { 1458 assert(ex->ideal_reg() == mach->ideal_reg(), "ideal types should match"); 1459 if( ex->in(1)->is_Con() ) 1460 ex->in(1)->set_req(0, C->root()); 1461 // Remove old node from the graph 1462 for( uint i=0; i<mach->req(); i++ ) { 1463 mach->set_req(i,NULL); 1464 } 1465 } 1466 1467 // PhaseChaitin::fixup_spills will sometimes generate spill code 1468 // via the matcher. By the time, nodes have been wired into the CFG, 1469 // and any further nodes generated by expand rules will be left hanging 1470 // in space, and will not get emitted as output code. Catch this. 1471 // Also, catch any new register allocation constraints ("projections") 1472 // generated belatedly during spill code generation. 1473 if (_allocation_started) { 1474 guarantee(ex == mach, "no expand rules during spill generation"); 1475 guarantee(_proj_list.size() == num_proj, "no allocation during spill generation"); 1476 } 1477 1478 if (leaf->is_Con()) { 1479 // Record the con for sharing 1480 _shared_constants.map(leaf->_idx, ex); 1481 } 1482 1483 return ex; 1484} 1485 1486void Matcher::ReduceInst_Chain_Rule( State *s, int rule, Node *&mem, MachNode *mach ) { 1487 // 'op' is what I am expecting to receive 1488 int op = _leftOp[rule]; 1489 // Operand type to catch childs result 1490 // This is what my child will give me. 1491 int opnd_class_instance = s->_rule[op]; 1492 // Choose between operand class or not. 1493 // This is what I will recieve. 1494 int catch_op = (FIRST_OPERAND_CLASS <= op && op < NUM_OPERANDS) ? opnd_class_instance : op; 1495 // New rule for child. Chase operand classes to get the actual rule. 1496 int newrule = s->_rule[catch_op]; 1497 1498 if( newrule < NUM_OPERANDS ) { 1499 // Chain from operand or operand class, may be output of shared node 1500 assert( 0 <= opnd_class_instance && opnd_class_instance < NUM_OPERANDS, 1501 "Bad AD file: Instruction chain rule must chain from operand"); 1502 // Insert operand into array of operands for this instruction 1503 mach->_opnds[1] = s->MachOperGenerator( opnd_class_instance, C ); 1504 1505 ReduceOper( s, newrule, mem, mach ); 1506 } else { 1507 // Chain from the result of an instruction 1508 assert( newrule >= _LAST_MACH_OPER, "Do NOT chain from internal operand"); 1509 mach->_opnds[1] = s->MachOperGenerator( _reduceOp[catch_op], C ); 1510 Node *mem1 = (Node*)1; 1511 mach->add_req( ReduceInst(s, newrule, mem1) ); 1512 } 1513 return; 1514} 1515 1516 1517uint Matcher::ReduceInst_Interior( State *s, int rule, Node *&mem, MachNode *mach, uint num_opnds ) { 1518 if( s->_leaf->is_Load() ) { 1519 Node *mem2 = s->_leaf->in(MemNode::Memory); 1520 assert( mem == (Node*)1 || mem == mem2, "multiple Memories being matched at once?" ); 1521 mem = mem2; 1522 } 1523 if( s->_leaf->in(0) != NULL && s->_leaf->req() > 1) { 1524 if( mach->in(0) == NULL ) 1525 mach->set_req(0, s->_leaf->in(0)); 1526 } 1527 1528 // Now recursively walk the state tree & add operand list. 1529 for( uint i=0; i<2; i++ ) { // binary tree 1530 State *newstate = s->_kids[i]; 1531 if( newstate == NULL ) break; // Might only have 1 child 1532 // 'op' is what I am expecting to receive 1533 int op; 1534 if( i == 0 ) { 1535 op = _leftOp[rule]; 1536 } else { 1537 op = _rightOp[rule]; 1538 } 1539 // Operand type to catch childs result 1540 // This is what my child will give me. 1541 int opnd_class_instance = newstate->_rule[op]; 1542 // Choose between operand class or not. 1543 // This is what I will receive. 1544 int catch_op = (op >= FIRST_OPERAND_CLASS && op < NUM_OPERANDS) ? opnd_class_instance : op; 1545 // New rule for child. Chase operand classes to get the actual rule. 1546 int newrule = newstate->_rule[catch_op]; 1547 1548 if( newrule < NUM_OPERANDS ) { // Operand/operandClass or internalOp/instruction? 1549 // Operand/operandClass 1550 // Insert operand into array of operands for this instruction 1551 mach->_opnds[num_opnds++] = newstate->MachOperGenerator( opnd_class_instance, C ); 1552 ReduceOper( newstate, newrule, mem, mach ); 1553 1554 } else { // Child is internal operand or new instruction 1555 if( newrule < _LAST_MACH_OPER ) { // internal operand or instruction? 1556 // internal operand --> call ReduceInst_Interior 1557 // Interior of complex instruction. Do nothing but recurse. 1558 num_opnds = ReduceInst_Interior( newstate, newrule, mem, mach, num_opnds ); 1559 } else { 1560 // instruction --> call build operand( ) to catch result 1561 // --> ReduceInst( newrule ) 1562 mach->_opnds[num_opnds++] = s->MachOperGenerator( _reduceOp[catch_op], C ); 1563 Node *mem1 = (Node*)1; 1564 mach->add_req( ReduceInst( newstate, newrule, mem1 ) ); 1565 } 1566 } 1567 assert( mach->_opnds[num_opnds-1], "" ); 1568 } 1569 return num_opnds; 1570} 1571 1572// This routine walks the interior of possible complex operands. 1573// At each point we check our children in the match tree: 1574// (1) No children - 1575// We are a leaf; add _leaf field as an input to the MachNode 1576// (2) Child is an internal operand - 1577// Skip over it ( do nothing ) 1578// (3) Child is an instruction - 1579// Call ReduceInst recursively and 1580// and instruction as an input to the MachNode 1581void Matcher::ReduceOper( State *s, int rule, Node *&mem, MachNode *mach ) { 1582 assert( rule < _LAST_MACH_OPER, "called with operand rule" ); 1583 State *kid = s->_kids[0]; 1584 assert( kid == NULL || s->_leaf->in(0) == NULL, "internal operands have no control" ); 1585 1586 // Leaf? And not subsumed? 1587 if( kid == NULL && !_swallowed[rule] ) { 1588 mach->add_req( s->_leaf ); // Add leaf pointer 1589 return; // Bail out 1590 } 1591 1592 if( s->_leaf->is_Load() ) { 1593 assert( mem == (Node*)1, "multiple Memories being matched at once?" ); 1594 mem = s->_leaf->in(MemNode::Memory); 1595 } 1596 if( s->_leaf->in(0) && s->_leaf->req() > 1) { 1597 if( !mach->in(0) ) 1598 mach->set_req(0,s->_leaf->in(0)); 1599 else { 1600 assert( s->_leaf->in(0) == mach->in(0), "same instruction, differing controls?" ); 1601 } 1602 } 1603 1604 for( uint i=0; kid != NULL && i<2; kid = s->_kids[1], i++ ) { // binary tree 1605 int newrule; 1606 if( i == 0 ) 1607 newrule = kid->_rule[_leftOp[rule]]; 1608 else 1609 newrule = kid->_rule[_rightOp[rule]]; 1610 1611 if( newrule < _LAST_MACH_OPER ) { // Operand or instruction? 1612 // Internal operand; recurse but do nothing else 1613 ReduceOper( kid, newrule, mem, mach ); 1614 1615 } else { // Child is a new instruction 1616 // Reduce the instruction, and add a direct pointer from this 1617 // machine instruction to the newly reduced one. 1618 Node *mem1 = (Node*)1; 1619 mach->add_req( ReduceInst( kid, newrule, mem1 ) ); 1620 } 1621 } 1622} 1623 1624 1625// ------------------------------------------------------------------------- 1626// Java-Java calling convention 1627// (what you use when Java calls Java) 1628 1629//------------------------------find_receiver---------------------------------- 1630// For a given signature, return the OptoReg for parameter 0. 1631OptoReg::Name Matcher::find_receiver( bool is_outgoing ) { 1632 VMRegPair regs; 1633 BasicType sig_bt = T_OBJECT; 1634 calling_convention(&sig_bt, ®s, 1, is_outgoing); 1635 // Return argument 0 register. In the LP64 build pointers 1636 // take 2 registers, but the VM wants only the 'main' name. 1637 return OptoReg::as_OptoReg(regs.first()); 1638} 1639 1640// A method-klass-holder may be passed in the inline_cache_reg 1641// and then expanded into the inline_cache_reg and a method_oop register 1642// defined in ad_<arch>.cpp 1643 1644 1645//------------------------------find_shared------------------------------------ 1646// Set bits if Node is shared or otherwise a root 1647void Matcher::find_shared( Node *n ) { 1648 // Allocate stack of size C->unique() * 2 to avoid frequent realloc 1649 MStack mstack(C->unique() * 2); 1650 mstack.push(n, Visit); // Don't need to pre-visit root node 1651 while (mstack.is_nonempty()) { 1652 n = mstack.node(); // Leave node on stack 1653 Node_State nstate = mstack.state(); 1654 if (nstate == Pre_Visit) { 1655 if (is_visited(n)) { // Visited already? 1656 // Node is shared and has no reason to clone. Flag it as shared. 1657 // This causes it to match into a register for the sharing. 1658 set_shared(n); // Flag as shared and 1659 mstack.pop(); // remove node from stack 1660 continue; 1661 } 1662 nstate = Visit; // Not already visited; so visit now 1663 } 1664 if (nstate == Visit) { 1665 mstack.set_state(Post_Visit); 1666 set_visited(n); // Flag as visited now 1667 bool mem_op = false; 1668 1669 switch( n->Opcode() ) { // Handle some opcodes special 1670 case Op_Phi: // Treat Phis as shared roots 1671 case Op_Parm: 1672 case Op_Proj: // All handled specially during matching 1673 case Op_SafePointScalarObject: 1674 set_shared(n); 1675 set_dontcare(n); 1676 break; 1677 case Op_If: 1678 case Op_CountedLoopEnd: 1679 mstack.set_state(Alt_Post_Visit); // Alternative way 1680 // Convert (If (Bool (CmpX A B))) into (If (Bool) (CmpX A B)). Helps 1681 // with matching cmp/branch in 1 instruction. The Matcher needs the 1682 // Bool and CmpX side-by-side, because it can only get at constants 1683 // that are at the leaves of Match trees, and the Bool's condition acts 1684 // as a constant here. 1685 mstack.push(n->in(1), Visit); // Clone the Bool 1686 mstack.push(n->in(0), Pre_Visit); // Visit control input 1687 continue; // while (mstack.is_nonempty()) 1688 case Op_ConvI2D: // These forms efficiently match with a prior 1689 case Op_ConvI2F: // Load but not a following Store 1690 if( n->in(1)->is_Load() && // Prior load 1691 n->outcnt() == 1 && // Not already shared 1692 n->unique_out()->is_Store() ) // Following store 1693 set_shared(n); // Force it to be a root 1694 break; 1695 case Op_ReverseBytesI: 1696 case Op_ReverseBytesL: 1697 if( n->in(1)->is_Load() && // Prior load 1698 n->outcnt() == 1 ) // Not already shared 1699 set_shared(n); // Force it to be a root 1700 break; 1701 case Op_BoxLock: // Cant match until we get stack-regs in ADLC 1702 case Op_IfFalse: 1703 case Op_IfTrue: 1704 case Op_MachProj: 1705 case Op_MergeMem: 1706 case Op_Catch: 1707 case Op_CatchProj: 1708 case Op_CProj: 1709 case Op_JumpProj: 1710 case Op_JProj: 1711 case Op_NeverBranch: 1712 set_dontcare(n); 1713 break; 1714 case Op_Jump: 1715 mstack.push(n->in(1), Visit); // Switch Value 1716 mstack.push(n->in(0), Pre_Visit); // Visit Control input 1717 continue; // while (mstack.is_nonempty()) 1718 case Op_StrComp: 1719 set_shared(n); // Force result into register (it will be anyways) 1720 break; 1721 case Op_ConP: { // Convert pointers above the centerline to NUL 1722 TypeNode *tn = n->as_Type(); // Constants derive from type nodes 1723 const TypePtr* tp = tn->type()->is_ptr(); 1724 if (tp->_ptr == TypePtr::AnyNull) { 1725 tn->set_type(TypePtr::NULL_PTR); 1726 } 1727 break; 1728 } 1729 case Op_ConN: { // Convert narrow pointers above the centerline to NUL 1730 TypeNode *tn = n->as_Type(); // Constants derive from type nodes 1731 const TypePtr* tp = tn->type()->is_narrowoop()->make_oopptr(); 1732 if (tp->_ptr == TypePtr::AnyNull) { 1733 tn->set_type(TypeNarrowOop::NULL_PTR); 1734 } 1735 break; 1736 } 1737 case Op_Binary: // These are introduced in the Post_Visit state. 1738 ShouldNotReachHere(); 1739 break; 1740 case Op_StoreB: // Do match these, despite no ideal reg 1741 case Op_StoreC: 1742 case Op_StoreCM: 1743 case Op_StoreD: 1744 case Op_StoreF: 1745 case Op_StoreI: 1746 case Op_StoreL: 1747 case Op_StoreP: 1748 case Op_StoreN: 1749 case Op_Store16B: 1750 case Op_Store8B: 1751 case Op_Store4B: 1752 case Op_Store8C: 1753 case Op_Store4C: 1754 case Op_Store2C: 1755 case Op_Store4I: 1756 case Op_Store2I: 1757 case Op_Store2L: 1758 case Op_Store4F: 1759 case Op_Store2F: 1760 case Op_Store2D: 1761 case Op_ClearArray: 1762 case Op_SafePoint: 1763 mem_op = true; 1764 break; 1765 case Op_LoadB: 1766 case Op_LoadC: 1767 case Op_LoadD: 1768 case Op_LoadF: 1769 case Op_LoadI: 1770 case Op_LoadKlass: 1771 case Op_LoadNKlass: 1772 case Op_LoadL: 1773 case Op_LoadS: 1774 case Op_LoadP: 1775 case Op_LoadN: 1776 case Op_LoadRange: 1777 case Op_LoadD_unaligned: 1778 case Op_LoadL_unaligned: 1779 case Op_Load16B: 1780 case Op_Load8B: 1781 case Op_Load4B: 1782 case Op_Load4C: 1783 case Op_Load2C: 1784 case Op_Load8C: 1785 case Op_Load8S: 1786 case Op_Load4S: 1787 case Op_Load2S: 1788 case Op_Load4I: 1789 case Op_Load2I: 1790 case Op_Load2L: 1791 case Op_Load4F: 1792 case Op_Load2F: 1793 case Op_Load2D: 1794 mem_op = true; 1795 // Must be root of match tree due to prior load conflict 1796 if( C->subsume_loads() == false ) { 1797 set_shared(n); 1798 } 1799 // Fall into default case 1800 default: 1801 if( !n->ideal_reg() ) 1802 set_dontcare(n); // Unmatchable Nodes 1803 } // end_switch 1804 1805 for(int i = n->req() - 1; i >= 0; --i) { // For my children 1806 Node *m = n->in(i); // Get ith input 1807 if (m == NULL) continue; // Ignore NULLs 1808 uint mop = m->Opcode(); 1809 1810 // Must clone all producers of flags, or we will not match correctly. 1811 // Suppose a compare setting int-flags is shared (e.g., a switch-tree) 1812 // then it will match into an ideal Op_RegFlags. Alas, the fp-flags 1813 // are also there, so we may match a float-branch to int-flags and 1814 // expect the allocator to haul the flags from the int-side to the 1815 // fp-side. No can do. 1816 if( _must_clone[mop] ) { 1817 mstack.push(m, Visit); 1818 continue; // for(int i = ...) 1819 } 1820 1821 // Clone addressing expressions as they are "free" in most instructions 1822 if( mem_op && i == MemNode::Address && mop == Op_AddP ) { 1823 Node *off = m->in(AddPNode::Offset); 1824 if( off->is_Con() ) { 1825 set_visited(m); // Flag as visited now 1826 Node *adr = m->in(AddPNode::Address); 1827 1828 // Intel, ARM and friends can handle 2 adds in addressing mode 1829 if( clone_shift_expressions && adr->Opcode() == Op_AddP && 1830 // AtomicAdd is not an addressing expression. 1831 // Cheap to find it by looking for screwy base. 1832 !adr->in(AddPNode::Base)->is_top() ) { 1833 set_visited(adr); // Flag as visited now 1834 Node *shift = adr->in(AddPNode::Offset); 1835 // Check for shift by small constant as well 1836 if( shift->Opcode() == Op_LShiftX && shift->in(2)->is_Con() && 1837 shift->in(2)->get_int() <= 3 ) { 1838 set_visited(shift); // Flag as visited now 1839 mstack.push(shift->in(2), Visit); 1840#ifdef _LP64 1841 // Allow Matcher to match the rule which bypass 1842 // ConvI2L operation for an array index on LP64 1843 // if the index value is positive. 1844 if( shift->in(1)->Opcode() == Op_ConvI2L && 1845 shift->in(1)->as_Type()->type()->is_long()->_lo >= 0 ) { 1846 set_visited(shift->in(1)); // Flag as visited now 1847 mstack.push(shift->in(1)->in(1), Pre_Visit); 1848 } else 1849#endif 1850 mstack.push(shift->in(1), Pre_Visit); 1851 } else { 1852 mstack.push(shift, Pre_Visit); 1853 } 1854 mstack.push(adr->in(AddPNode::Address), Pre_Visit); 1855 mstack.push(adr->in(AddPNode::Base), Pre_Visit); 1856 } else { // Sparc, Alpha, PPC and friends 1857 mstack.push(adr, Pre_Visit); 1858 } 1859 1860 // Clone X+offset as it also folds into most addressing expressions 1861 mstack.push(off, Visit); 1862 mstack.push(m->in(AddPNode::Base), Pre_Visit); 1863 continue; // for(int i = ...) 1864 } // if( off->is_Con() ) 1865 } // if( mem_op && 1866 mstack.push(m, Pre_Visit); 1867 } // for(int i = ...) 1868 } 1869 else if (nstate == Alt_Post_Visit) { 1870 mstack.pop(); // Remove node from stack 1871 // We cannot remove the Cmp input from the Bool here, as the Bool may be 1872 // shared and all users of the Bool need to move the Cmp in parallel. 1873 // This leaves both the Bool and the If pointing at the Cmp. To 1874 // prevent the Matcher from trying to Match the Cmp along both paths 1875 // BoolNode::match_edge always returns a zero. 1876 1877 // We reorder the Op_If in a pre-order manner, so we can visit without 1878 // accidently sharing the Cmp (the Bool and the If make 2 users). 1879 n->add_req( n->in(1)->in(1) ); // Add the Cmp next to the Bool 1880 } 1881 else if (nstate == Post_Visit) { 1882 mstack.pop(); // Remove node from stack 1883 1884 // Now hack a few special opcodes 1885 switch( n->Opcode() ) { // Handle some opcodes special 1886 case Op_StorePConditional: 1887 case Op_StoreLConditional: 1888 case Op_CompareAndSwapI: 1889 case Op_CompareAndSwapL: 1890 case Op_CompareAndSwapP: 1891 case Op_CompareAndSwapN: { // Convert trinary to binary-tree 1892 Node *newval = n->in(MemNode::ValueIn ); 1893 Node *oldval = n->in(LoadStoreNode::ExpectedIn); 1894 Node *pair = new (C, 3) BinaryNode( oldval, newval ); 1895 n->set_req(MemNode::ValueIn,pair); 1896 n->del_req(LoadStoreNode::ExpectedIn); 1897 break; 1898 } 1899 case Op_CMoveD: // Convert trinary to binary-tree 1900 case Op_CMoveF: 1901 case Op_CMoveI: 1902 case Op_CMoveL: 1903 case Op_CMoveN: 1904 case Op_CMoveP: { 1905 // Restructure into a binary tree for Matching. It's possible that 1906 // we could move this code up next to the graph reshaping for IfNodes 1907 // or vice-versa, but I do not want to debug this for Ladybird. 1908 // 10/2/2000 CNC. 1909 Node *pair1 = new (C, 3) BinaryNode(n->in(1),n->in(1)->in(1)); 1910 n->set_req(1,pair1); 1911 Node *pair2 = new (C, 3) BinaryNode(n->in(2),n->in(3)); 1912 n->set_req(2,pair2); 1913 n->del_req(3); 1914 break; 1915 } 1916 default: 1917 break; 1918 } 1919 } 1920 else { 1921 ShouldNotReachHere(); 1922 } 1923 } // end of while (mstack.is_nonempty()) 1924} 1925 1926#ifdef ASSERT 1927// machine-independent root to machine-dependent root 1928void Matcher::dump_old2new_map() { 1929 _old2new_map.dump(); 1930} 1931#endif 1932 1933//---------------------------collect_null_checks------------------------------- 1934// Find null checks in the ideal graph; write a machine-specific node for 1935// it. Used by later implicit-null-check handling. Actually collects 1936// either an IfTrue or IfFalse for the common NOT-null path, AND the ideal 1937// value being tested. 1938void Matcher::collect_null_checks( Node *proj ) { 1939 Node *iff = proj->in(0); 1940 if( iff->Opcode() == Op_If ) { 1941 // During matching If's have Bool & Cmp side-by-side 1942 BoolNode *b = iff->in(1)->as_Bool(); 1943 Node *cmp = iff->in(2); 1944 int opc = cmp->Opcode(); 1945 if (opc != Op_CmpP && opc != Op_CmpN) return; 1946 1947 const Type* ct = cmp->in(2)->bottom_type(); 1948 if (ct == TypePtr::NULL_PTR || 1949 (opc == Op_CmpN && ct == TypeNarrowOop::NULL_PTR)) { 1950 1951 if( proj->Opcode() == Op_IfTrue ) { 1952 extern int all_null_checks_found; 1953 all_null_checks_found++; 1954 if( b->_test._test == BoolTest::ne ) { 1955 _null_check_tests.push(proj); 1956 _null_check_tests.push(cmp->in(1)); 1957 } 1958 } else { 1959 assert( proj->Opcode() == Op_IfFalse, "" ); 1960 if( b->_test._test == BoolTest::eq ) { 1961 _null_check_tests.push(proj); 1962 _null_check_tests.push(cmp->in(1)); 1963 } 1964 } 1965 } 1966 } 1967} 1968 1969//---------------------------validate_null_checks------------------------------ 1970// Its possible that the value being NULL checked is not the root of a match 1971// tree. If so, I cannot use the value in an implicit null check. 1972void Matcher::validate_null_checks( ) { 1973 uint cnt = _null_check_tests.size(); 1974 for( uint i=0; i < cnt; i+=2 ) { 1975 Node *test = _null_check_tests[i]; 1976 Node *val = _null_check_tests[i+1]; 1977 if (has_new_node(val)) { 1978 // Is a match-tree root, so replace with the matched value 1979 _null_check_tests.map(i+1, new_node(val)); 1980 } else { 1981 // Yank from candidate list 1982 _null_check_tests.map(i+1,_null_check_tests[--cnt]); 1983 _null_check_tests.map(i,_null_check_tests[--cnt]); 1984 _null_check_tests.pop(); 1985 _null_check_tests.pop(); 1986 i-=2; 1987 } 1988 } 1989} 1990 1991 1992// Used by the DFA in dfa_sparc.cpp. Check for a prior FastLock 1993// acting as an Acquire and thus we don't need an Acquire here. We 1994// retain the Node to act as a compiler ordering barrier. 1995bool Matcher::prior_fast_lock( const Node *acq ) { 1996 Node *r = acq->in(0); 1997 if( !r->is_Region() || r->req() <= 1 ) return false; 1998 Node *proj = r->in(1); 1999 if( !proj->is_Proj() ) return false; 2000 Node *call = proj->in(0); 2001 if( !call->is_Call() || call->as_Call()->entry_point() != OptoRuntime::complete_monitor_locking_Java() ) 2002 return false; 2003 2004 return true; 2005} 2006 2007// Used by the DFA in dfa_sparc.cpp. Check for a following FastUnLock 2008// acting as a Release and thus we don't need a Release here. We 2009// retain the Node to act as a compiler ordering barrier. 2010bool Matcher::post_fast_unlock( const Node *rel ) { 2011 Compile *C = Compile::current(); 2012 assert( rel->Opcode() == Op_MemBarRelease, "" ); 2013 const MemBarReleaseNode *mem = (const MemBarReleaseNode*)rel; 2014 DUIterator_Fast imax, i = mem->fast_outs(imax); 2015 Node *ctrl = NULL; 2016 while( true ) { 2017 ctrl = mem->fast_out(i); // Throw out-of-bounds if proj not found 2018 assert( ctrl->is_Proj(), "only projections here" ); 2019 ProjNode *proj = (ProjNode*)ctrl; 2020 if( proj->_con == TypeFunc::Control && 2021 !C->node_arena()->contains(ctrl) ) // Unmatched old-space only 2022 break; 2023 i++; 2024 } 2025 Node *iff = NULL; 2026 for( DUIterator_Fast jmax, j = ctrl->fast_outs(jmax); j < jmax; j++ ) { 2027 Node *x = ctrl->fast_out(j); 2028 if( x->is_If() && x->req() > 1 && 2029 !C->node_arena()->contains(x) ) { // Unmatched old-space only 2030 iff = x; 2031 break; 2032 } 2033 } 2034 if( !iff ) return false; 2035 Node *bol = iff->in(1); 2036 // The iff might be some random subclass of If or bol might be Con-Top 2037 if (!bol->is_Bool()) return false; 2038 assert( bol->req() > 1, "" ); 2039 return (bol->in(1)->Opcode() == Op_FastUnlock); 2040} 2041 2042// Used by the DFA in dfa_xxx.cpp. Check for a following barrier or 2043// atomic instruction acting as a store_load barrier without any 2044// intervening volatile load, and thus we don't need a barrier here. 2045// We retain the Node to act as a compiler ordering barrier. 2046bool Matcher::post_store_load_barrier(const Node *vmb) { 2047 Compile *C = Compile::current(); 2048 assert( vmb->is_MemBar(), "" ); 2049 assert( vmb->Opcode() != Op_MemBarAcquire, "" ); 2050 const MemBarNode *mem = (const MemBarNode*)vmb; 2051 2052 // Get the Proj node, ctrl, that can be used to iterate forward 2053 Node *ctrl = NULL; 2054 DUIterator_Fast imax, i = mem->fast_outs(imax); 2055 while( true ) { 2056 ctrl = mem->fast_out(i); // Throw out-of-bounds if proj not found 2057 assert( ctrl->is_Proj(), "only projections here" ); 2058 ProjNode *proj = (ProjNode*)ctrl; 2059 if( proj->_con == TypeFunc::Control && 2060 !C->node_arena()->contains(ctrl) ) // Unmatched old-space only 2061 break; 2062 i++; 2063 } 2064 2065 for( DUIterator_Fast jmax, j = ctrl->fast_outs(jmax); j < jmax; j++ ) { 2066 Node *x = ctrl->fast_out(j); 2067 int xop = x->Opcode(); 2068 2069 // We don't need current barrier if we see another or a lock 2070 // before seeing volatile load. 2071 // 2072 // Op_Fastunlock previously appeared in the Op_* list below. 2073 // With the advent of 1-0 lock operations we're no longer guaranteed 2074 // that a monitor exit operation contains a serializing instruction. 2075 2076 if (xop == Op_MemBarVolatile || 2077 xop == Op_FastLock || 2078 xop == Op_CompareAndSwapL || 2079 xop == Op_CompareAndSwapP || 2080 xop == Op_CompareAndSwapN || 2081 xop == Op_CompareAndSwapI) 2082 return true; 2083 2084 if (x->is_MemBar()) { 2085 // We must retain this membar if there is an upcoming volatile 2086 // load, which will be preceded by acquire membar. 2087 if (xop == Op_MemBarAcquire) 2088 return false; 2089 // For other kinds of barriers, check by pretending we 2090 // are them, and seeing if we can be removed. 2091 else 2092 return post_store_load_barrier((const MemBarNode*)x); 2093 } 2094 2095 // Delicate code to detect case of an upcoming fastlock block 2096 if( x->is_If() && x->req() > 1 && 2097 !C->node_arena()->contains(x) ) { // Unmatched old-space only 2098 Node *iff = x; 2099 Node *bol = iff->in(1); 2100 // The iff might be some random subclass of If or bol might be Con-Top 2101 if (!bol->is_Bool()) return false; 2102 assert( bol->req() > 1, "" ); 2103 return (bol->in(1)->Opcode() == Op_FastUnlock); 2104 } 2105 // probably not necessary to check for these 2106 if (x->is_Call() || x->is_SafePoint() || x->is_block_proj()) 2107 return false; 2108 } 2109 return false; 2110} 2111 2112//============================================================================= 2113//---------------------------State--------------------------------------------- 2114State::State(void) { 2115#ifdef ASSERT 2116 _id = 0; 2117 _kids[0] = _kids[1] = (State*)(intptr_t) CONST64(0xcafebabecafebabe); 2118 _leaf = (Node*)(intptr_t) CONST64(0xbaadf00dbaadf00d); 2119 //memset(_cost, -1, sizeof(_cost)); 2120 //memset(_rule, -1, sizeof(_rule)); 2121#endif 2122 memset(_valid, 0, sizeof(_valid)); 2123} 2124 2125#ifdef ASSERT 2126State::~State() { 2127 _id = 99; 2128 _kids[0] = _kids[1] = (State*)(intptr_t) CONST64(0xcafebabecafebabe); 2129 _leaf = (Node*)(intptr_t) CONST64(0xbaadf00dbaadf00d); 2130 memset(_cost, -3, sizeof(_cost)); 2131 memset(_rule, -3, sizeof(_rule)); 2132} 2133#endif 2134 2135#ifndef PRODUCT 2136//---------------------------dump---------------------------------------------- 2137void State::dump() { 2138 tty->print("\n"); 2139 dump(0); 2140} 2141 2142void State::dump(int depth) { 2143 for( int j = 0; j < depth; j++ ) 2144 tty->print(" "); 2145 tty->print("--N: "); 2146 _leaf->dump(); 2147 uint i; 2148 for( i = 0; i < _LAST_MACH_OPER; i++ ) 2149 // Check for valid entry 2150 if( valid(i) ) { 2151 for( int j = 0; j < depth; j++ ) 2152 tty->print(" "); 2153 assert(_cost[i] != max_juint, "cost must be a valid value"); 2154 assert(_rule[i] < _last_Mach_Node, "rule[i] must be valid rule"); 2155 tty->print_cr("%s %d %s", 2156 ruleName[i], _cost[i], ruleName[_rule[i]] ); 2157 } 2158 tty->print_cr(""); 2159 2160 for( i=0; i<2; i++ ) 2161 if( _kids[i] ) 2162 _kids[i]->dump(depth+1); 2163} 2164#endif 2165