Mercurial > hg > graal-compiler
annotate src/share/vm/opto/matcher.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 844a9d73ec22 |
| children | e9ff18c4ace7 |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_matcher.cpp.incl" | |
| 27 | |
| 28 OptoReg::Name OptoReg::c_frame_pointer; | |
| 29 | |
| 30 | |
| 31 | |
| 32 const int Matcher::base2reg[Type::lastype] = { | |
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33 Node::NotAMachineReg,0,0, Op_RegI, Op_RegL, 0, Op_RegN, |
| 0 | 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 | |
| 42 const RegMask *Matcher::idealreg2regmask[_last_machine_leaf]; | |
| 43 RegMask Matcher::mreg2regmask[_last_Mach_Reg]; | |
| 44 RegMask Matcher::STACK_ONLY_mask; | |
| 45 RegMask Matcher::c_frame_ptr_mask; | |
| 46 const uint Matcher::_begin_rematerialize = _BEGIN_REMATERIALIZE; | |
| 47 const uint Matcher::_end_rematerialize = _END_REMATERIALIZE; | |
| 48 | |
| 49 //---------------------------Matcher------------------------------------------- | |
| 50 Matcher::Matcher( Node_List &proj_list ) : | |
| 51 PhaseTransform( Phase::Ins_Select ), | |
| 52 #ifdef ASSERT | |
| 53 _old2new_map(C->comp_arena()), | |
| 222 | 54 _new2old_map(C->comp_arena()), |
| 0 | 55 #endif |
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56 _shared_nodes(C->comp_arena()), |
| 0 | 57 _reduceOp(reduceOp), _leftOp(leftOp), _rightOp(rightOp), |
| 58 _swallowed(swallowed), | |
| 59 _begin_inst_chain_rule(_BEGIN_INST_CHAIN_RULE), | |
| 60 _end_inst_chain_rule(_END_INST_CHAIN_RULE), | |
| 61 _must_clone(must_clone), _proj_list(proj_list), | |
| 62 _register_save_policy(register_save_policy), | |
| 63 _c_reg_save_policy(c_reg_save_policy), | |
| 64 _register_save_type(register_save_type), | |
| 65 _ruleName(ruleName), | |
| 66 _allocation_started(false), | |
| 67 _states_arena(Chunk::medium_size), | |
| 68 _visited(&_states_arena), | |
| 69 _shared(&_states_arena), | |
| 70 _dontcare(&_states_arena) { | |
| 71 C->set_matcher(this); | |
| 72 | |
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73 idealreg2spillmask [Op_RegI] = NULL; |
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74 idealreg2spillmask [Op_RegN] = NULL; |
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75 idealreg2spillmask [Op_RegL] = NULL; |
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76 idealreg2spillmask [Op_RegF] = NULL; |
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77 idealreg2spillmask [Op_RegD] = NULL; |
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78 idealreg2spillmask [Op_RegP] = NULL; |
| 0 | 79 |
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80 idealreg2debugmask [Op_RegI] = NULL; |
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81 idealreg2debugmask [Op_RegN] = NULL; |
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82 idealreg2debugmask [Op_RegL] = NULL; |
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83 idealreg2debugmask [Op_RegF] = NULL; |
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84 idealreg2debugmask [Op_RegD] = NULL; |
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85 idealreg2debugmask [Op_RegP] = NULL; |
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86 |
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87 idealreg2mhdebugmask[Op_RegI] = NULL; |
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88 idealreg2mhdebugmask[Op_RegN] = NULL; |
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89 idealreg2mhdebugmask[Op_RegL] = NULL; |
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90 idealreg2mhdebugmask[Op_RegF] = NULL; |
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91 idealreg2mhdebugmask[Op_RegD] = NULL; |
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92 idealreg2mhdebugmask[Op_RegP] = NULL; |
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93 |
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94 debug_only(_mem_node = NULL;) // Ideal memory node consumed by mach node |
| 0 | 95 } |
| 96 | |
| 97 //------------------------------warp_incoming_stk_arg------------------------ | |
| 98 // This warps a VMReg into an OptoReg::Name | |
| 99 OptoReg::Name Matcher::warp_incoming_stk_arg( VMReg reg ) { | |
| 100 OptoReg::Name warped; | |
| 101 if( reg->is_stack() ) { // Stack slot argument? | |
| 102 warped = OptoReg::add(_old_SP, reg->reg2stack() ); | |
| 103 warped = OptoReg::add(warped, C->out_preserve_stack_slots()); | |
| 104 if( warped >= _in_arg_limit ) | |
| 105 _in_arg_limit = OptoReg::add(warped, 1); // Bump max stack slot seen | |
| 106 if (!RegMask::can_represent(warped)) { | |
| 107 // the compiler cannot represent this method's calling sequence | |
| 108 C->record_method_not_compilable_all_tiers("unsupported incoming calling sequence"); | |
| 109 return OptoReg::Bad; | |
| 110 } | |
| 111 return warped; | |
| 112 } | |
| 113 return OptoReg::as_OptoReg(reg); | |
| 114 } | |
| 115 | |
| 116 //---------------------------compute_old_SP------------------------------------ | |
| 117 OptoReg::Name Compile::compute_old_SP() { | |
| 118 int fixed = fixed_slots(); | |
| 119 int preserve = in_preserve_stack_slots(); | |
| 120 return OptoReg::stack2reg(round_to(fixed + preserve, Matcher::stack_alignment_in_slots())); | |
| 121 } | |
| 122 | |
| 123 | |
| 124 | |
| 125 #ifdef ASSERT | |
| 126 void Matcher::verify_new_nodes_only(Node* xroot) { | |
| 127 // Make sure that the new graph only references new nodes | |
| 128 ResourceMark rm; | |
| 129 Unique_Node_List worklist; | |
| 130 VectorSet visited(Thread::current()->resource_area()); | |
| 131 worklist.push(xroot); | |
| 132 while (worklist.size() > 0) { | |
| 133 Node* n = worklist.pop(); | |
| 134 visited <<= n->_idx; | |
| 135 assert(C->node_arena()->contains(n), "dead node"); | |
| 136 for (uint j = 0; j < n->req(); j++) { | |
| 137 Node* in = n->in(j); | |
| 138 if (in != NULL) { | |
| 139 assert(C->node_arena()->contains(in), "dead node"); | |
| 140 if (!visited.test(in->_idx)) { | |
| 141 worklist.push(in); | |
| 142 } | |
| 143 } | |
| 144 } | |
| 145 } | |
| 146 } | |
| 147 #endif | |
| 148 | |
| 149 | |
| 150 //---------------------------match--------------------------------------------- | |
| 151 void Matcher::match( ) { | |
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152 if( MaxLabelRootDepth < 100 ) { // Too small? |
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153 assert(false, "invalid MaxLabelRootDepth, increase it to 100 minimum"); |
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154 MaxLabelRootDepth = 100; |
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155 } |
| 0 | 156 // One-time initialization of some register masks. |
| 157 init_spill_mask( C->root()->in(1) ); | |
| 158 _return_addr_mask = return_addr(); | |
| 159 #ifdef _LP64 | |
| 160 // Pointers take 2 slots in 64-bit land | |
| 161 _return_addr_mask.Insert(OptoReg::add(return_addr(),1)); | |
| 162 #endif | |
| 163 | |
| 164 // Map a Java-signature return type into return register-value | |
| 165 // machine registers for 0, 1 and 2 returned values. | |
| 166 const TypeTuple *range = C->tf()->range(); | |
| 167 if( range->cnt() > TypeFunc::Parms ) { // If not a void function | |
| 168 // Get ideal-register return type | |
| 169 int ireg = base2reg[range->field_at(TypeFunc::Parms)->base()]; | |
| 170 // Get machine return register | |
| 171 uint sop = C->start()->Opcode(); | |
| 172 OptoRegPair regs = return_value(ireg, false); | |
| 173 | |
| 174 // And mask for same | |
| 175 _return_value_mask = RegMask(regs.first()); | |
| 176 if( OptoReg::is_valid(regs.second()) ) | |
| 177 _return_value_mask.Insert(regs.second()); | |
| 178 } | |
| 179 | |
| 180 // --------------- | |
| 181 // Frame Layout | |
| 182 | |
| 183 // Need the method signature to determine the incoming argument types, | |
| 184 // because the types determine which registers the incoming arguments are | |
| 185 // in, and this affects the matched code. | |
| 186 const TypeTuple *domain = C->tf()->domain(); | |
| 187 uint argcnt = domain->cnt() - TypeFunc::Parms; | |
| 188 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, argcnt ); | |
| 189 VMRegPair *vm_parm_regs = NEW_RESOURCE_ARRAY( VMRegPair, argcnt ); | |
| 190 _parm_regs = NEW_RESOURCE_ARRAY( OptoRegPair, argcnt ); | |
| 191 _calling_convention_mask = NEW_RESOURCE_ARRAY( RegMask, argcnt ); | |
| 192 uint i; | |
| 193 for( i = 0; i<argcnt; i++ ) { | |
| 194 sig_bt[i] = domain->field_at(i+TypeFunc::Parms)->basic_type(); | |
| 195 } | |
| 196 | |
| 197 // Pass array of ideal registers and length to USER code (from the AD file) | |
| 198 // that will convert this to an array of register numbers. | |
| 199 const StartNode *start = C->start(); | |
| 200 start->calling_convention( sig_bt, vm_parm_regs, argcnt ); | |
| 201 #ifdef ASSERT | |
| 202 // Sanity check users' calling convention. Real handy while trying to | |
| 203 // get the initial port correct. | |
| 204 { for (uint i = 0; i<argcnt; i++) { | |
| 205 if( !vm_parm_regs[i].first()->is_valid() && !vm_parm_regs[i].second()->is_valid() ) { | |
| 206 assert(domain->field_at(i+TypeFunc::Parms)==Type::HALF, "only allowed on halve" ); | |
| 207 _parm_regs[i].set_bad(); | |
| 208 continue; | |
| 209 } | |
| 210 VMReg parm_reg = vm_parm_regs[i].first(); | |
| 211 assert(parm_reg->is_valid(), "invalid arg?"); | |
| 212 if (parm_reg->is_reg()) { | |
| 213 OptoReg::Name opto_parm_reg = OptoReg::as_OptoReg(parm_reg); | |
| 214 assert(can_be_java_arg(opto_parm_reg) || | |
| 215 C->stub_function() == CAST_FROM_FN_PTR(address, OptoRuntime::rethrow_C) || | |
| 216 opto_parm_reg == inline_cache_reg(), | |
| 217 "parameters in register must be preserved by runtime stubs"); | |
| 218 } | |
| 219 for (uint j = 0; j < i; j++) { | |
| 220 assert(parm_reg != vm_parm_regs[j].first(), | |
| 221 "calling conv. must produce distinct regs"); | |
| 222 } | |
| 223 } | |
| 224 } | |
| 225 #endif | |
| 226 | |
| 227 // Do some initial frame layout. | |
| 228 | |
| 229 // Compute the old incoming SP (may be called FP) as | |
| 230 // OptoReg::stack0() + locks + in_preserve_stack_slots + pad2. | |
| 231 _old_SP = C->compute_old_SP(); | |
| 232 assert( is_even(_old_SP), "must be even" ); | |
| 233 | |
| 234 // Compute highest incoming stack argument as | |
| 235 // _old_SP + out_preserve_stack_slots + incoming argument size. | |
| 236 _in_arg_limit = OptoReg::add(_old_SP, C->out_preserve_stack_slots()); | |
| 237 assert( is_even(_in_arg_limit), "out_preserve must be even" ); | |
| 238 for( i = 0; i < argcnt; i++ ) { | |
| 239 // Permit args to have no register | |
| 240 _calling_convention_mask[i].Clear(); | |
| 241 if( !vm_parm_regs[i].first()->is_valid() && !vm_parm_regs[i].second()->is_valid() ) { | |
| 242 continue; | |
| 243 } | |
| 244 // calling_convention returns stack arguments as a count of | |
| 245 // slots beyond OptoReg::stack0()/VMRegImpl::stack0. We need to convert this to | |
| 246 // the allocators point of view, taking into account all the | |
| 247 // preserve area, locks & pad2. | |
| 248 | |
| 249 OptoReg::Name reg1 = warp_incoming_stk_arg(vm_parm_regs[i].first()); | |
| 250 if( OptoReg::is_valid(reg1)) | |
| 251 _calling_convention_mask[i].Insert(reg1); | |
| 252 | |
| 253 OptoReg::Name reg2 = warp_incoming_stk_arg(vm_parm_regs[i].second()); | |
| 254 if( OptoReg::is_valid(reg2)) | |
| 255 _calling_convention_mask[i].Insert(reg2); | |
| 256 | |
| 257 // Saved biased stack-slot register number | |
| 258 _parm_regs[i].set_pair(reg2, reg1); | |
| 259 } | |
| 260 | |
| 261 // Finally, make sure the incoming arguments take up an even number of | |
| 262 // words, in case the arguments or locals need to contain doubleword stack | |
| 263 // slots. The rest of the system assumes that stack slot pairs (in | |
| 264 // particular, in the spill area) which look aligned will in fact be | |
| 265 // aligned relative to the stack pointer in the target machine. Double | |
| 266 // stack slots will always be allocated aligned. | |
| 267 _new_SP = OptoReg::Name(round_to(_in_arg_limit, RegMask::SlotsPerLong)); | |
| 268 | |
| 269 // Compute highest outgoing stack argument as | |
| 270 // _new_SP + out_preserve_stack_slots + max(outgoing argument size). | |
| 271 _out_arg_limit = OptoReg::add(_new_SP, C->out_preserve_stack_slots()); | |
| 272 assert( is_even(_out_arg_limit), "out_preserve must be even" ); | |
| 273 | |
| 274 if (!RegMask::can_represent(OptoReg::add(_out_arg_limit,-1))) { | |
| 275 // the compiler cannot represent this method's calling sequence | |
| 276 C->record_method_not_compilable("must be able to represent all call arguments in reg mask"); | |
| 277 } | |
| 278 | |
| 279 if (C->failing()) return; // bailed out on incoming arg failure | |
| 280 | |
| 281 // --------------- | |
| 282 // Collect roots of matcher trees. Every node for which | |
| 283 // _shared[_idx] is cleared is guaranteed to not be shared, and thus | |
| 284 // can be a valid interior of some tree. | |
| 285 find_shared( C->root() ); | |
| 286 find_shared( C->top() ); | |
| 287 | |
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288 C->print_method("Before Matching"); |
| 0 | 289 |
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290 // Create new ideal node ConP #NULL even if it does exist in old space |
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291 // to avoid false sharing if the corresponding mach node is not used. |
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292 // The corresponding mach node is only used in rare cases for derived |
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293 // pointers. |
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294 Node* new_ideal_null = ConNode::make(C, TypePtr::NULL_PTR); |
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295 |
| 0 | 296 // Swap out to old-space; emptying new-space |
| 297 Arena *old = C->node_arena()->move_contents(C->old_arena()); | |
| 298 | |
| 299 // Save debug and profile information for nodes in old space: | |
| 300 _old_node_note_array = C->node_note_array(); | |
| 301 if (_old_node_note_array != NULL) { | |
| 302 C->set_node_note_array(new(C->comp_arena()) GrowableArray<Node_Notes*> | |
| 303 (C->comp_arena(), _old_node_note_array->length(), | |
| 304 0, NULL)); | |
| 305 } | |
| 306 | |
| 307 // Pre-size the new_node table to avoid the need for range checks. | |
| 308 grow_new_node_array(C->unique()); | |
| 309 | |
| 310 // Reset node counter so MachNodes start with _idx at 0 | |
| 311 int nodes = C->unique(); // save value | |
| 312 C->set_unique(0); | |
| 313 | |
| 314 // Recursively match trees from old space into new space. | |
| 315 // Correct leaves of new-space Nodes; they point to old-space. | |
| 316 _visited.Clear(); // Clear visit bits for xform call | |
| 317 C->set_cached_top_node(xform( C->top(), nodes )); | |
| 318 if (!C->failing()) { | |
| 319 Node* xroot = xform( C->root(), 1 ); | |
| 320 if (xroot == NULL) { | |
| 321 Matcher::soft_match_failure(); // recursive matching process failed | |
| 322 C->record_method_not_compilable("instruction match failed"); | |
| 323 } else { | |
| 324 // During matching shared constants were attached to C->root() | |
| 325 // because xroot wasn't available yet, so transfer the uses to | |
| 326 // the xroot. | |
| 327 for( DUIterator_Fast jmax, j = C->root()->fast_outs(jmax); j < jmax; j++ ) { | |
| 328 Node* n = C->root()->fast_out(j); | |
| 329 if (C->node_arena()->contains(n)) { | |
| 330 assert(n->in(0) == C->root(), "should be control user"); | |
| 331 n->set_req(0, xroot); | |
| 332 --j; | |
| 333 --jmax; | |
| 334 } | |
| 335 } | |
| 336 | |
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337 // Generate new mach node for ConP #NULL |
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338 assert(new_ideal_null != NULL, "sanity"); |
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339 _mach_null = match_tree(new_ideal_null); |
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340 // Don't set control, it will confuse GCM since there are no uses. |
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341 // The control will be set when this node is used first time |
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342 // in find_base_for_derived(). |
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343 assert(_mach_null != NULL, ""); |
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344 |
| 0 | 345 C->set_root(xroot->is_Root() ? xroot->as_Root() : NULL); |
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346 |
| 0 | 347 #ifdef ASSERT |
| 348 verify_new_nodes_only(xroot); | |
| 349 #endif | |
| 350 } | |
| 351 } | |
| 352 if (C->top() == NULL || C->root() == NULL) { | |
| 353 C->record_method_not_compilable("graph lost"); // %%% cannot happen? | |
| 354 } | |
| 355 if (C->failing()) { | |
| 356 // delete old; | |
| 357 old->destruct_contents(); | |
| 358 return; | |
| 359 } | |
| 360 assert( C->top(), "" ); | |
| 361 assert( C->root(), "" ); | |
| 362 validate_null_checks(); | |
| 363 | |
| 364 // Now smoke old-space | |
| 365 NOT_DEBUG( old->destruct_contents() ); | |
| 366 | |
| 367 // ------------------------ | |
| 368 // Set up save-on-entry registers | |
| 369 Fixup_Save_On_Entry( ); | |
| 370 } | |
| 371 | |
| 372 | |
| 373 //------------------------------Fixup_Save_On_Entry---------------------------- | |
| 374 // The stated purpose of this routine is to take care of save-on-entry | |
| 375 // registers. However, the overall goal of the Match phase is to convert into | |
| 376 // machine-specific instructions which have RegMasks to guide allocation. | |
| 377 // So what this procedure really does is put a valid RegMask on each input | |
| 378 // to the machine-specific variations of all Return, TailCall and Halt | |
| 379 // instructions. It also adds edgs to define the save-on-entry values (and of | |
| 380 // course gives them a mask). | |
| 381 | |
| 382 static RegMask *init_input_masks( uint size, RegMask &ret_adr, RegMask &fp ) { | |
| 383 RegMask *rms = NEW_RESOURCE_ARRAY( RegMask, size ); | |
| 384 // Do all the pre-defined register masks | |
| 385 rms[TypeFunc::Control ] = RegMask::Empty; | |
| 386 rms[TypeFunc::I_O ] = RegMask::Empty; | |
| 387 rms[TypeFunc::Memory ] = RegMask::Empty; | |
| 388 rms[TypeFunc::ReturnAdr] = ret_adr; | |
| 389 rms[TypeFunc::FramePtr ] = fp; | |
| 390 return rms; | |
| 391 } | |
| 392 | |
| 393 //---------------------------init_first_stack_mask----------------------------- | |
| 394 // Create the initial stack mask used by values spilling to the stack. | |
| 395 // Disallow any debug info in outgoing argument areas by setting the | |
| 396 // initial mask accordingly. | |
| 397 void Matcher::init_first_stack_mask() { | |
| 398 | |
| 399 // Allocate storage for spill masks as masks for the appropriate load type. | |
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400 RegMask *rms = (RegMask*)C->comp_arena()->Amalloc_D(sizeof(RegMask) * 3*6); |
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401 |
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402 idealreg2spillmask [Op_RegN] = &rms[0]; |
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403 idealreg2spillmask [Op_RegI] = &rms[1]; |
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404 idealreg2spillmask [Op_RegL] = &rms[2]; |
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405 idealreg2spillmask [Op_RegF] = &rms[3]; |
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406 idealreg2spillmask [Op_RegD] = &rms[4]; |
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407 idealreg2spillmask [Op_RegP] = &rms[5]; |
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408 |
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409 idealreg2debugmask [Op_RegN] = &rms[6]; |
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410 idealreg2debugmask [Op_RegI] = &rms[7]; |
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411 idealreg2debugmask [Op_RegL] = &rms[8]; |
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412 idealreg2debugmask [Op_RegF] = &rms[9]; |
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413 idealreg2debugmask [Op_RegD] = &rms[10]; |
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414 idealreg2debugmask [Op_RegP] = &rms[11]; |
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415 |
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416 idealreg2mhdebugmask[Op_RegN] = &rms[12]; |
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417 idealreg2mhdebugmask[Op_RegI] = &rms[13]; |
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418 idealreg2mhdebugmask[Op_RegL] = &rms[14]; |
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419 idealreg2mhdebugmask[Op_RegF] = &rms[15]; |
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420 idealreg2mhdebugmask[Op_RegD] = &rms[16]; |
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421 idealreg2mhdebugmask[Op_RegP] = &rms[17]; |
| 0 | 422 |
| 423 OptoReg::Name i; | |
| 424 | |
| 425 // At first, start with the empty mask | |
| 426 C->FIRST_STACK_mask().Clear(); | |
| 427 | |
| 428 // Add in the incoming argument area | |
| 429 OptoReg::Name init = OptoReg::add(_old_SP, C->out_preserve_stack_slots()); | |
| 430 for (i = init; i < _in_arg_limit; i = OptoReg::add(i,1)) | |
| 431 C->FIRST_STACK_mask().Insert(i); | |
| 432 | |
| 433 // Add in all bits past the outgoing argument area | |
| 434 guarantee(RegMask::can_represent(OptoReg::add(_out_arg_limit,-1)), | |
| 435 "must be able to represent all call arguments in reg mask"); | |
| 436 init = _out_arg_limit; | |
| 437 for (i = init; RegMask::can_represent(i); i = OptoReg::add(i,1)) | |
| 438 C->FIRST_STACK_mask().Insert(i); | |
| 439 | |
| 440 // Finally, set the "infinite stack" bit. | |
| 441 C->FIRST_STACK_mask().set_AllStack(); | |
| 442 | |
| 443 // Make spill masks. Registers for their class, plus FIRST_STACK_mask. | |
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444 #ifdef _LP64 |
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445 *idealreg2spillmask[Op_RegN] = *idealreg2regmask[Op_RegN]; |
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446 idealreg2spillmask[Op_RegN]->OR(C->FIRST_STACK_mask()); |
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447 #endif |
| 0 | 448 *idealreg2spillmask[Op_RegI] = *idealreg2regmask[Op_RegI]; |
| 449 idealreg2spillmask[Op_RegI]->OR(C->FIRST_STACK_mask()); | |
| 450 *idealreg2spillmask[Op_RegL] = *idealreg2regmask[Op_RegL]; | |
| 451 idealreg2spillmask[Op_RegL]->OR(C->FIRST_STACK_mask()); | |
| 452 *idealreg2spillmask[Op_RegF] = *idealreg2regmask[Op_RegF]; | |
| 453 idealreg2spillmask[Op_RegF]->OR(C->FIRST_STACK_mask()); | |
| 454 *idealreg2spillmask[Op_RegD] = *idealreg2regmask[Op_RegD]; | |
| 455 idealreg2spillmask[Op_RegD]->OR(C->FIRST_STACK_mask()); | |
| 456 *idealreg2spillmask[Op_RegP] = *idealreg2regmask[Op_RegP]; | |
| 457 idealreg2spillmask[Op_RegP]->OR(C->FIRST_STACK_mask()); | |
| 458 | |
| 459 // Make up debug masks. Any spill slot plus callee-save registers. | |
| 460 // Caller-save registers are assumed to be trashable by the various | |
| 461 // inline-cache fixup routines. | |
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462 *idealreg2debugmask [Op_RegN]= *idealreg2spillmask[Op_RegN]; |
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463 *idealreg2debugmask [Op_RegI]= *idealreg2spillmask[Op_RegI]; |
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464 *idealreg2debugmask [Op_RegL]= *idealreg2spillmask[Op_RegL]; |
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465 *idealreg2debugmask [Op_RegF]= *idealreg2spillmask[Op_RegF]; |
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466 *idealreg2debugmask [Op_RegD]= *idealreg2spillmask[Op_RegD]; |
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467 *idealreg2debugmask [Op_RegP]= *idealreg2spillmask[Op_RegP]; |
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468 |
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469 *idealreg2mhdebugmask[Op_RegN]= *idealreg2spillmask[Op_RegN]; |
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470 *idealreg2mhdebugmask[Op_RegI]= *idealreg2spillmask[Op_RegI]; |
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471 *idealreg2mhdebugmask[Op_RegL]= *idealreg2spillmask[Op_RegL]; |
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472 *idealreg2mhdebugmask[Op_RegF]= *idealreg2spillmask[Op_RegF]; |
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473 *idealreg2mhdebugmask[Op_RegD]= *idealreg2spillmask[Op_RegD]; |
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474 *idealreg2mhdebugmask[Op_RegP]= *idealreg2spillmask[Op_RegP]; |
| 0 | 475 |
| 476 // Prevent stub compilations from attempting to reference | |
| 477 // callee-saved registers from debug info | |
| 478 bool exclude_soe = !Compile::current()->is_method_compilation(); | |
| 479 | |
| 480 for( i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) { | |
| 481 // registers the caller has to save do not work | |
| 482 if( _register_save_policy[i] == 'C' || | |
| 483 _register_save_policy[i] == 'A' || | |
| 484 (_register_save_policy[i] == 'E' && exclude_soe) ) { | |
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485 idealreg2debugmask [Op_RegN]->Remove(i); |
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486 idealreg2debugmask [Op_RegI]->Remove(i); // Exclude save-on-call |
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487 idealreg2debugmask [Op_RegL]->Remove(i); // registers from debug |
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488 idealreg2debugmask [Op_RegF]->Remove(i); // masks |
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489 idealreg2debugmask [Op_RegD]->Remove(i); |
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490 idealreg2debugmask [Op_RegP]->Remove(i); |
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491 |
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492 idealreg2mhdebugmask[Op_RegN]->Remove(i); |
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493 idealreg2mhdebugmask[Op_RegI]->Remove(i); |
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494 idealreg2mhdebugmask[Op_RegL]->Remove(i); |
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495 idealreg2mhdebugmask[Op_RegF]->Remove(i); |
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496 idealreg2mhdebugmask[Op_RegD]->Remove(i); |
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497 idealreg2mhdebugmask[Op_RegP]->Remove(i); |
| 0 | 498 } |
| 499 } | |
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500 |
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501 // Subtract the register we use to save the SP for MethodHandle |
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502 // invokes to from the debug mask. |
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503 const RegMask save_mask = method_handle_invoke_SP_save_mask(); |
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504 idealreg2mhdebugmask[Op_RegN]->SUBTRACT(save_mask); |
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505 idealreg2mhdebugmask[Op_RegI]->SUBTRACT(save_mask); |
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506 idealreg2mhdebugmask[Op_RegL]->SUBTRACT(save_mask); |
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507 idealreg2mhdebugmask[Op_RegF]->SUBTRACT(save_mask); |
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508 idealreg2mhdebugmask[Op_RegD]->SUBTRACT(save_mask); |
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509 idealreg2mhdebugmask[Op_RegP]->SUBTRACT(save_mask); |
| 0 | 510 } |
| 511 | |
| 512 //---------------------------is_save_on_entry---------------------------------- | |
| 513 bool Matcher::is_save_on_entry( int reg ) { | |
| 514 return | |
| 515 _register_save_policy[reg] == 'E' || | |
| 516 _register_save_policy[reg] == 'A' || // Save-on-entry register? | |
| 517 // Also save argument registers in the trampolining stubs | |
| 518 (C->save_argument_registers() && is_spillable_arg(reg)); | |
| 519 } | |
| 520 | |
| 521 //---------------------------Fixup_Save_On_Entry------------------------------- | |
| 522 void Matcher::Fixup_Save_On_Entry( ) { | |
| 523 init_first_stack_mask(); | |
| 524 | |
| 525 Node *root = C->root(); // Short name for root | |
| 526 // Count number of save-on-entry registers. | |
| 527 uint soe_cnt = number_of_saved_registers(); | |
| 528 uint i; | |
| 529 | |
| 530 // Find the procedure Start Node | |
| 531 StartNode *start = C->start(); | |
| 532 assert( start, "Expect a start node" ); | |
| 533 | |
| 534 // Save argument registers in the trampolining stubs | |
| 535 if( C->save_argument_registers() ) | |
| 536 for( i = 0; i < _last_Mach_Reg; i++ ) | |
| 537 if( is_spillable_arg(i) ) | |
| 538 soe_cnt++; | |
| 539 | |
| 540 // Input RegMask array shared by all Returns. | |
| 541 // The type for doubles and longs has a count of 2, but | |
| 542 // there is only 1 returned value | |
| 543 uint ret_edge_cnt = TypeFunc::Parms + ((C->tf()->range()->cnt() == TypeFunc::Parms) ? 0 : 1); | |
| 544 RegMask *ret_rms = init_input_masks( ret_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); | |
| 545 // Returns have 0 or 1 returned values depending on call signature. | |
| 546 // Return register is specified by return_value in the AD file. | |
| 547 if (ret_edge_cnt > TypeFunc::Parms) | |
| 548 ret_rms[TypeFunc::Parms+0] = _return_value_mask; | |
| 549 | |
| 550 // Input RegMask array shared by all Rethrows. | |
| 551 uint reth_edge_cnt = TypeFunc::Parms+1; | |
| 552 RegMask *reth_rms = init_input_masks( reth_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); | |
| 553 // Rethrow takes exception oop only, but in the argument 0 slot. | |
| 554 reth_rms[TypeFunc::Parms] = mreg2regmask[find_receiver(false)]; | |
| 555 #ifdef _LP64 | |
| 556 // Need two slots for ptrs in 64-bit land | |
| 557 reth_rms[TypeFunc::Parms].Insert(OptoReg::add(OptoReg::Name(find_receiver(false)),1)); | |
| 558 #endif | |
| 559 | |
| 560 // Input RegMask array shared by all TailCalls | |
| 561 uint tail_call_edge_cnt = TypeFunc::Parms+2; | |
| 562 RegMask *tail_call_rms = init_input_masks( tail_call_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); | |
| 563 | |
| 564 // Input RegMask array shared by all TailJumps | |
| 565 uint tail_jump_edge_cnt = TypeFunc::Parms+2; | |
| 566 RegMask *tail_jump_rms = init_input_masks( tail_jump_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); | |
| 567 | |
| 568 // TailCalls have 2 returned values (target & moop), whose masks come | |
| 569 // from the usual MachNode/MachOper mechanism. Find a sample | |
| 570 // TailCall to extract these masks and put the correct masks into | |
| 571 // the tail_call_rms array. | |
| 572 for( i=1; i < root->req(); i++ ) { | |
| 573 MachReturnNode *m = root->in(i)->as_MachReturn(); | |
| 574 if( m->ideal_Opcode() == Op_TailCall ) { | |
| 575 tail_call_rms[TypeFunc::Parms+0] = m->MachNode::in_RegMask(TypeFunc::Parms+0); | |
| 576 tail_call_rms[TypeFunc::Parms+1] = m->MachNode::in_RegMask(TypeFunc::Parms+1); | |
| 577 break; | |
| 578 } | |
| 579 } | |
| 580 | |
| 581 // TailJumps have 2 returned values (target & ex_oop), whose masks come | |
| 582 // from the usual MachNode/MachOper mechanism. Find a sample | |
| 583 // TailJump to extract these masks and put the correct masks into | |
| 584 // the tail_jump_rms array. | |
| 585 for( i=1; i < root->req(); i++ ) { | |
| 586 MachReturnNode *m = root->in(i)->as_MachReturn(); | |
| 587 if( m->ideal_Opcode() == Op_TailJump ) { | |
| 588 tail_jump_rms[TypeFunc::Parms+0] = m->MachNode::in_RegMask(TypeFunc::Parms+0); | |
| 589 tail_jump_rms[TypeFunc::Parms+1] = m->MachNode::in_RegMask(TypeFunc::Parms+1); | |
| 590 break; | |
| 591 } | |
| 592 } | |
| 593 | |
| 594 // Input RegMask array shared by all Halts | |
| 595 uint halt_edge_cnt = TypeFunc::Parms; | |
| 596 RegMask *halt_rms = init_input_masks( halt_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask ); | |
| 597 | |
| 598 // Capture the return input masks into each exit flavor | |
| 599 for( i=1; i < root->req(); i++ ) { | |
| 600 MachReturnNode *exit = root->in(i)->as_MachReturn(); | |
| 601 switch( exit->ideal_Opcode() ) { | |
| 602 case Op_Return : exit->_in_rms = ret_rms; break; | |
| 603 case Op_Rethrow : exit->_in_rms = reth_rms; break; | |
| 604 case Op_TailCall : exit->_in_rms = tail_call_rms; break; | |
| 605 case Op_TailJump : exit->_in_rms = tail_jump_rms; break; | |
| 606 case Op_Halt : exit->_in_rms = halt_rms; break; | |
| 607 default : ShouldNotReachHere(); | |
| 608 } | |
| 609 } | |
| 610 | |
| 611 // Next unused projection number from Start. | |
| 612 int proj_cnt = C->tf()->domain()->cnt(); | |
| 613 | |
| 614 // Do all the save-on-entry registers. Make projections from Start for | |
| 615 // them, and give them a use at the exit points. To the allocator, they | |
| 616 // look like incoming register arguments. | |
| 617 for( i = 0; i < _last_Mach_Reg; i++ ) { | |
| 618 if( is_save_on_entry(i) ) { | |
| 619 | |
| 620 // Add the save-on-entry to the mask array | |
| 621 ret_rms [ ret_edge_cnt] = mreg2regmask[i]; | |
| 622 reth_rms [ reth_edge_cnt] = mreg2regmask[i]; | |
| 623 tail_call_rms[tail_call_edge_cnt] = mreg2regmask[i]; | |
| 624 tail_jump_rms[tail_jump_edge_cnt] = mreg2regmask[i]; | |
| 625 // Halts need the SOE registers, but only in the stack as debug info. | |
| 626 // A just-prior uncommon-trap or deoptimization will use the SOE regs. | |
| 627 halt_rms [ halt_edge_cnt] = *idealreg2spillmask[_register_save_type[i]]; | |
| 628 | |
| 629 Node *mproj; | |
| 630 | |
| 631 // Is this a RegF low half of a RegD? Double up 2 adjacent RegF's | |
| 632 // into a single RegD. | |
| 633 if( (i&1) == 0 && | |
| 634 _register_save_type[i ] == Op_RegF && | |
| 635 _register_save_type[i+1] == Op_RegF && | |
| 636 is_save_on_entry(i+1) ) { | |
| 637 // Add other bit for double | |
| 638 ret_rms [ ret_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 639 reth_rms [ reth_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 640 tail_call_rms[tail_call_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 641 tail_jump_rms[tail_jump_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 642 halt_rms [ halt_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 643 mproj = new (C, 1) MachProjNode( start, proj_cnt, ret_rms[ret_edge_cnt], Op_RegD ); | |
| 644 proj_cnt += 2; // Skip 2 for doubles | |
| 645 } | |
| 646 else if( (i&1) == 1 && // Else check for high half of double | |
| 647 _register_save_type[i-1] == Op_RegF && | |
| 648 _register_save_type[i ] == Op_RegF && | |
| 649 is_save_on_entry(i-1) ) { | |
| 650 ret_rms [ ret_edge_cnt] = RegMask::Empty; | |
| 651 reth_rms [ reth_edge_cnt] = RegMask::Empty; | |
| 652 tail_call_rms[tail_call_edge_cnt] = RegMask::Empty; | |
| 653 tail_jump_rms[tail_jump_edge_cnt] = RegMask::Empty; | |
| 654 halt_rms [ halt_edge_cnt] = RegMask::Empty; | |
| 655 mproj = C->top(); | |
| 656 } | |
| 657 // Is this a RegI low half of a RegL? Double up 2 adjacent RegI's | |
| 658 // into a single RegL. | |
| 659 else if( (i&1) == 0 && | |
| 660 _register_save_type[i ] == Op_RegI && | |
| 661 _register_save_type[i+1] == Op_RegI && | |
| 662 is_save_on_entry(i+1) ) { | |
| 663 // Add other bit for long | |
| 664 ret_rms [ ret_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 665 reth_rms [ reth_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 666 tail_call_rms[tail_call_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 667 tail_jump_rms[tail_jump_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 668 halt_rms [ halt_edge_cnt].Insert(OptoReg::Name(i+1)); | |
| 669 mproj = new (C, 1) MachProjNode( start, proj_cnt, ret_rms[ret_edge_cnt], Op_RegL ); | |
| 670 proj_cnt += 2; // Skip 2 for longs | |
| 671 } | |
| 672 else if( (i&1) == 1 && // Else check for high half of long | |
| 673 _register_save_type[i-1] == Op_RegI && | |
| 674 _register_save_type[i ] == Op_RegI && | |
| 675 is_save_on_entry(i-1) ) { | |
| 676 ret_rms [ ret_edge_cnt] = RegMask::Empty; | |
| 677 reth_rms [ reth_edge_cnt] = RegMask::Empty; | |
| 678 tail_call_rms[tail_call_edge_cnt] = RegMask::Empty; | |
| 679 tail_jump_rms[tail_jump_edge_cnt] = RegMask::Empty; | |
| 680 halt_rms [ halt_edge_cnt] = RegMask::Empty; | |
| 681 mproj = C->top(); | |
| 682 } else { | |
| 683 // Make a projection for it off the Start | |
| 684 mproj = new (C, 1) MachProjNode( start, proj_cnt++, ret_rms[ret_edge_cnt], _register_save_type[i] ); | |
| 685 } | |
| 686 | |
| 687 ret_edge_cnt ++; | |
| 688 reth_edge_cnt ++; | |
| 689 tail_call_edge_cnt ++; | |
| 690 tail_jump_edge_cnt ++; | |
| 691 halt_edge_cnt ++; | |
| 692 | |
| 693 // Add a use of the SOE register to all exit paths | |
| 694 for( uint j=1; j < root->req(); j++ ) | |
| 695 root->in(j)->add_req(mproj); | |
| 696 } // End of if a save-on-entry register | |
| 697 } // End of for all machine registers | |
| 698 } | |
| 699 | |
| 700 //------------------------------init_spill_mask-------------------------------- | |
| 701 void Matcher::init_spill_mask( Node *ret ) { | |
| 702 if( idealreg2regmask[Op_RegI] ) return; // One time only init | |
| 703 | |
| 704 OptoReg::c_frame_pointer = c_frame_pointer(); | |
| 705 c_frame_ptr_mask = c_frame_pointer(); | |
| 706 #ifdef _LP64 | |
| 707 // pointers are twice as big | |
| 708 c_frame_ptr_mask.Insert(OptoReg::add(c_frame_pointer(),1)); | |
| 709 #endif | |
| 710 | |
| 711 // Start at OptoReg::stack0() | |
| 712 STACK_ONLY_mask.Clear(); | |
| 713 OptoReg::Name init = OptoReg::stack2reg(0); | |
| 714 // STACK_ONLY_mask is all stack bits | |
| 715 OptoReg::Name i; | |
| 716 for (i = init; RegMask::can_represent(i); i = OptoReg::add(i,1)) | |
| 717 STACK_ONLY_mask.Insert(i); | |
| 718 // Also set the "infinite stack" bit. | |
| 719 STACK_ONLY_mask.set_AllStack(); | |
| 720 | |
| 721 // Copy the register names over into the shared world | |
| 722 for( i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) { | |
| 723 // SharedInfo::regName[i] = regName[i]; | |
| 724 // Handy RegMasks per machine register | |
| 725 mreg2regmask[i].Insert(i); | |
| 726 } | |
| 727 | |
| 728 // Grab the Frame Pointer | |
| 729 Node *fp = ret->in(TypeFunc::FramePtr); | |
| 730 Node *mem = ret->in(TypeFunc::Memory); | |
| 731 const TypePtr* atp = TypePtr::BOTTOM; | |
| 732 // Share frame pointer while making spill ops | |
| 733 set_shared(fp); | |
| 734 | |
| 735 // Compute generic short-offset Loads | |
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736 #ifdef _LP64 |
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737 MachNode *spillCP = match_tree(new (C, 3) LoadNNode(NULL,mem,fp,atp,TypeInstPtr::BOTTOM)); |
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738 #endif |
| 0 | 739 MachNode *spillI = match_tree(new (C, 3) LoadINode(NULL,mem,fp,atp)); |
| 740 MachNode *spillL = match_tree(new (C, 3) LoadLNode(NULL,mem,fp,atp)); | |
| 741 MachNode *spillF = match_tree(new (C, 3) LoadFNode(NULL,mem,fp,atp)); | |
| 742 MachNode *spillD = match_tree(new (C, 3) LoadDNode(NULL,mem,fp,atp)); | |
| 743 MachNode *spillP = match_tree(new (C, 3) LoadPNode(NULL,mem,fp,atp,TypeInstPtr::BOTTOM)); | |
| 744 assert(spillI != NULL && spillL != NULL && spillF != NULL && | |
| 745 spillD != NULL && spillP != NULL, ""); | |
| 746 | |
| 747 // Get the ADLC notion of the right regmask, for each basic type. | |
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748 #ifdef _LP64 |
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749 idealreg2regmask[Op_RegN] = &spillCP->out_RegMask(); |
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750 #endif |
| 0 | 751 idealreg2regmask[Op_RegI] = &spillI->out_RegMask(); |
| 752 idealreg2regmask[Op_RegL] = &spillL->out_RegMask(); | |
| 753 idealreg2regmask[Op_RegF] = &spillF->out_RegMask(); | |
| 754 idealreg2regmask[Op_RegD] = &spillD->out_RegMask(); | |
| 755 idealreg2regmask[Op_RegP] = &spillP->out_RegMask(); | |
| 756 } | |
| 757 | |
| 758 #ifdef ASSERT | |
| 759 static void match_alias_type(Compile* C, Node* n, Node* m) { | |
| 760 if (!VerifyAliases) return; // do not go looking for trouble by default | |
| 761 const TypePtr* nat = n->adr_type(); | |
| 762 const TypePtr* mat = m->adr_type(); | |
| 763 int nidx = C->get_alias_index(nat); | |
| 764 int midx = C->get_alias_index(mat); | |
| 765 // Detune the assert for cases like (AndI 0xFF (LoadB p)). | |
| 766 if (nidx == Compile::AliasIdxTop && midx >= Compile::AliasIdxRaw) { | |
| 767 for (uint i = 1; i < n->req(); i++) { | |
| 768 Node* n1 = n->in(i); | |
| 769 const TypePtr* n1at = n1->adr_type(); | |
| 770 if (n1at != NULL) { | |
| 771 nat = n1at; | |
| 772 nidx = C->get_alias_index(n1at); | |
| 773 } | |
| 774 } | |
| 775 } | |
| 776 // %%% Kludgery. Instead, fix ideal adr_type methods for all these cases: | |
| 777 if (nidx == Compile::AliasIdxTop && midx == Compile::AliasIdxRaw) { | |
| 778 switch (n->Opcode()) { | |
| 779 case Op_PrefetchRead: | |
| 780 case Op_PrefetchWrite: | |
| 781 nidx = Compile::AliasIdxRaw; | |
| 782 nat = TypeRawPtr::BOTTOM; | |
| 783 break; | |
| 784 } | |
| 785 } | |
| 786 if (nidx == Compile::AliasIdxRaw && midx == Compile::AliasIdxTop) { | |
| 787 switch (n->Opcode()) { | |
| 788 case Op_ClearArray: | |
| 789 midx = Compile::AliasIdxRaw; | |
| 790 mat = TypeRawPtr::BOTTOM; | |
| 791 break; | |
| 792 } | |
| 793 } | |
| 794 if (nidx == Compile::AliasIdxTop && midx == Compile::AliasIdxBot) { | |
| 795 switch (n->Opcode()) { | |
| 796 case Op_Return: | |
| 797 case Op_Rethrow: | |
| 798 case Op_Halt: | |
| 799 case Op_TailCall: | |
| 800 case Op_TailJump: | |
| 801 nidx = Compile::AliasIdxBot; | |
| 802 nat = TypePtr::BOTTOM; | |
| 803 break; | |
| 804 } | |
| 805 } | |
| 806 if (nidx == Compile::AliasIdxBot && midx == Compile::AliasIdxTop) { | |
| 807 switch (n->Opcode()) { | |
| 808 case Op_StrComp: | |
| 681 | 809 case Op_StrEquals: |
| 810 case Op_StrIndexOf: | |
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811 case Op_AryEq: |
| 0 | 812 case Op_MemBarVolatile: |
| 813 case Op_MemBarCPUOrder: // %%% these ideals should have narrower adr_type? | |
| 814 nidx = Compile::AliasIdxTop; | |
| 815 nat = NULL; | |
| 816 break; | |
| 817 } | |
| 818 } | |
| 819 if (nidx != midx) { | |
| 820 if (PrintOpto || (PrintMiscellaneous && (WizardMode || Verbose))) { | |
| 821 tty->print_cr("==== Matcher alias shift %d => %d", nidx, midx); | |
| 822 n->dump(); | |
| 823 m->dump(); | |
| 824 } | |
| 825 assert(C->subsume_loads() && C->must_alias(nat, midx), | |
| 826 "must not lose alias info when matching"); | |
| 827 } | |
| 828 } | |
| 829 #endif | |
| 830 | |
| 831 | |
| 832 //------------------------------MStack----------------------------------------- | |
| 833 // State and MStack class used in xform() and find_shared() iterative methods. | |
| 834 enum Node_State { Pre_Visit, // node has to be pre-visited | |
| 835 Visit, // visit node | |
| 836 Post_Visit, // post-visit node | |
| 837 Alt_Post_Visit // alternative post-visit path | |
| 838 }; | |
| 839 | |
| 840 class MStack: public Node_Stack { | |
| 841 public: | |
| 842 MStack(int size) : Node_Stack(size) { } | |
| 843 | |
| 844 void push(Node *n, Node_State ns) { | |
| 845 Node_Stack::push(n, (uint)ns); | |
| 846 } | |
| 847 void push(Node *n, Node_State ns, Node *parent, int indx) { | |
| 848 ++_inode_top; | |
| 849 if ((_inode_top + 1) >= _inode_max) grow(); | |
| 850 _inode_top->node = parent; | |
| 851 _inode_top->indx = (uint)indx; | |
| 852 ++_inode_top; | |
| 853 _inode_top->node = n; | |
| 854 _inode_top->indx = (uint)ns; | |
| 855 } | |
| 856 Node *parent() { | |
| 857 pop(); | |
| 858 return node(); | |
| 859 } | |
| 860 Node_State state() const { | |
| 861 return (Node_State)index(); | |
| 862 } | |
| 863 void set_state(Node_State ns) { | |
| 864 set_index((uint)ns); | |
| 865 } | |
| 866 }; | |
| 867 | |
| 868 | |
| 869 //------------------------------xform------------------------------------------ | |
| 870 // Given a Node in old-space, Match him (Label/Reduce) to produce a machine | |
| 871 // Node in new-space. Given a new-space Node, recursively walk his children. | |
| 872 Node *Matcher::transform( Node *n ) { ShouldNotCallThis(); return n; } | |
| 873 Node *Matcher::xform( Node *n, int max_stack ) { | |
| 874 // Use one stack to keep both: child's node/state and parent's node/index | |
| 875 MStack mstack(max_stack * 2 * 2); // C->unique() * 2 * 2 | |
| 876 mstack.push(n, Visit, NULL, -1); // set NULL as parent to indicate root | |
| 877 | |
| 878 while (mstack.is_nonempty()) { | |
| 879 n = mstack.node(); // Leave node on stack | |
| 880 Node_State nstate = mstack.state(); | |
| 881 if (nstate == Visit) { | |
| 882 mstack.set_state(Post_Visit); | |
| 883 Node *oldn = n; | |
| 884 // Old-space or new-space check | |
| 885 if (!C->node_arena()->contains(n)) { | |
| 886 // Old space! | |
| 887 Node* m; | |
| 888 if (has_new_node(n)) { // Not yet Label/Reduced | |
| 889 m = new_node(n); | |
| 890 } else { | |
| 891 if (!is_dontcare(n)) { // Matcher can match this guy | |
| 892 // Calls match special. They match alone with no children. | |
| 893 // Their children, the incoming arguments, match normally. | |
| 894 m = n->is_SafePoint() ? match_sfpt(n->as_SafePoint()):match_tree(n); | |
| 895 if (C->failing()) return NULL; | |
| 896 if (m == NULL) { Matcher::soft_match_failure(); return NULL; } | |
| 897 } else { // Nothing the matcher cares about | |
| 898 if( n->is_Proj() && n->in(0)->is_Multi()) { // Projections? | |
| 899 // Convert to machine-dependent projection | |
| 900 m = n->in(0)->as_Multi()->match( n->as_Proj(), this ); | |
| 222 | 901 #ifdef ASSERT |
| 902 _new2old_map.map(m->_idx, n); | |
| 903 #endif | |
| 0 | 904 if (m->in(0) != NULL) // m might be top |
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905 collect_null_checks(m, n); |
| 0 | 906 } else { // Else just a regular 'ol guy |
| 907 m = n->clone(); // So just clone into new-space | |
| 222 | 908 #ifdef ASSERT |
| 909 _new2old_map.map(m->_idx, n); | |
| 910 #endif | |
| 0 | 911 // Def-Use edges will be added incrementally as Uses |
| 912 // of this node are matched. | |
| 913 assert(m->outcnt() == 0, "no Uses of this clone yet"); | |
| 914 } | |
| 915 } | |
| 916 | |
| 917 set_new_node(n, m); // Map old to new | |
| 918 if (_old_node_note_array != NULL) { | |
| 919 Node_Notes* nn = C->locate_node_notes(_old_node_note_array, | |
| 920 n->_idx); | |
| 921 C->set_node_notes_at(m->_idx, nn); | |
| 922 } | |
| 923 debug_only(match_alias_type(C, n, m)); | |
| 924 } | |
| 925 n = m; // n is now a new-space node | |
| 926 mstack.set_node(n); | |
| 927 } | |
| 928 | |
| 929 // New space! | |
| 930 if (_visited.test_set(n->_idx)) continue; // while(mstack.is_nonempty()) | |
| 931 | |
| 932 int i; | |
| 933 // Put precedence edges on stack first (match them last). | |
| 934 for (i = oldn->req(); (uint)i < oldn->len(); i++) { | |
| 935 Node *m = oldn->in(i); | |
| 936 if (m == NULL) break; | |
| 937 // set -1 to call add_prec() instead of set_req() during Step1 | |
| 938 mstack.push(m, Visit, n, -1); | |
| 939 } | |
| 940 | |
| 941 // For constant debug info, I'd rather have unmatched constants. | |
| 942 int cnt = n->req(); | |
| 943 JVMState* jvms = n->jvms(); | |
| 944 int debug_cnt = jvms ? jvms->debug_start() : cnt; | |
| 945 | |
| 946 // Now do only debug info. Clone constants rather than matching. | |
| 947 // Constants are represented directly in the debug info without | |
| 948 // the need for executable machine instructions. | |
| 949 // Monitor boxes are also represented directly. | |
| 950 for (i = cnt - 1; i >= debug_cnt; --i) { // For all debug inputs do | |
| 951 Node *m = n->in(i); // Get input | |
| 952 int op = m->Opcode(); | |
| 953 assert((op == Op_BoxLock) == jvms->is_monitor_use(i), "boxes only at monitor sites"); | |
| 163 | 954 if( op == Op_ConI || op == Op_ConP || op == Op_ConN || |
| 0 | 955 op == Op_ConF || op == Op_ConD || op == Op_ConL |
| 956 // || op == Op_BoxLock // %%%% enable this and remove (+++) in chaitin.cpp | |
| 957 ) { | |
| 958 m = m->clone(); | |
| 222 | 959 #ifdef ASSERT |
| 960 _new2old_map.map(m->_idx, n); | |
| 961 #endif | |
| 605 | 962 mstack.push(m, Post_Visit, n, i); // Don't need to visit |
| 0 | 963 mstack.push(m->in(0), Visit, m, 0); |
| 964 } else { | |
| 965 mstack.push(m, Visit, n, i); | |
| 966 } | |
| 967 } | |
| 968 | |
| 969 // And now walk his children, and convert his inputs to new-space. | |
| 970 for( ; i >= 0; --i ) { // For all normal inputs do | |
| 971 Node *m = n->in(i); // Get input | |
| 972 if(m != NULL) | |
| 973 mstack.push(m, Visit, n, i); | |
| 974 } | |
| 975 | |
| 976 } | |
| 977 else if (nstate == Post_Visit) { | |
| 978 // Set xformed input | |
| 979 Node *p = mstack.parent(); | |
| 980 if (p != NULL) { // root doesn't have parent | |
| 981 int i = (int)mstack.index(); | |
| 982 if (i >= 0) | |
| 983 p->set_req(i, n); // required input | |
| 984 else if (i == -1) | |
| 985 p->add_prec(n); // precedence input | |
| 986 else | |
| 987 ShouldNotReachHere(); | |
| 988 } | |
| 989 mstack.pop(); // remove processed node from stack | |
| 990 } | |
| 991 else { | |
| 992 ShouldNotReachHere(); | |
| 993 } | |
| 994 } // while (mstack.is_nonempty()) | |
| 995 return n; // Return new-space Node | |
| 996 } | |
| 997 | |
| 998 //------------------------------warp_outgoing_stk_arg------------------------ | |
| 999 OptoReg::Name Matcher::warp_outgoing_stk_arg( VMReg reg, OptoReg::Name begin_out_arg_area, OptoReg::Name &out_arg_limit_per_call ) { | |
| 1000 // Convert outgoing argument location to a pre-biased stack offset | |
| 1001 if (reg->is_stack()) { | |
| 1002 OptoReg::Name warped = reg->reg2stack(); | |
| 1003 // Adjust the stack slot offset to be the register number used | |
| 1004 // by the allocator. | |
| 1005 warped = OptoReg::add(begin_out_arg_area, warped); | |
| 1006 // Keep track of the largest numbered stack slot used for an arg. | |
| 1007 // Largest used slot per call-site indicates the amount of stack | |
| 1008 // that is killed by the call. | |
| 1009 if( warped >= out_arg_limit_per_call ) | |
| 1010 out_arg_limit_per_call = OptoReg::add(warped,1); | |
| 1011 if (!RegMask::can_represent(warped)) { | |
| 1012 C->record_method_not_compilable_all_tiers("unsupported calling sequence"); | |
| 1013 return OptoReg::Bad; | |
| 1014 } | |
| 1015 return warped; | |
| 1016 } | |
| 1017 return OptoReg::as_OptoReg(reg); | |
| 1018 } | |
| 1019 | |
| 1020 | |
| 1021 //------------------------------match_sfpt------------------------------------- | |
| 1022 // Helper function to match call instructions. Calls match special. | |
| 1023 // They match alone with no children. Their children, the incoming | |
| 1024 // arguments, match normally. | |
| 1025 MachNode *Matcher::match_sfpt( SafePointNode *sfpt ) { | |
| 1026 MachSafePointNode *msfpt = NULL; | |
| 1027 MachCallNode *mcall = NULL; | |
| 1028 uint cnt; | |
| 1029 // Split out case for SafePoint vs Call | |
| 1030 CallNode *call; | |
| 1031 const TypeTuple *domain; | |
| 1032 ciMethod* method = NULL; | |
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1033 bool is_method_handle_invoke = false; // for special kill effects |
| 0 | 1034 if( sfpt->is_Call() ) { |
| 1035 call = sfpt->as_Call(); | |
| 1036 domain = call->tf()->domain(); | |
| 1037 cnt = domain->cnt(); | |
| 1038 | |
| 1039 // Match just the call, nothing else | |
| 1040 MachNode *m = match_tree(call); | |
| 1041 if (C->failing()) return NULL; | |
| 1042 if( m == NULL ) { Matcher::soft_match_failure(); return NULL; } | |
| 1043 | |
| 1044 // Copy data from the Ideal SafePoint to the machine version | |
| 1045 mcall = m->as_MachCall(); | |
| 1046 | |
| 1047 mcall->set_tf( call->tf()); | |
| 1048 mcall->set_entry_point(call->entry_point()); | |
| 1049 mcall->set_cnt( call->cnt()); | |
| 1050 | |
| 1051 if( mcall->is_MachCallJava() ) { | |
| 1052 MachCallJavaNode *mcall_java = mcall->as_MachCallJava(); | |
| 1053 const CallJavaNode *call_java = call->as_CallJava(); | |
| 1054 method = call_java->method(); | |
| 1055 mcall_java->_method = method; | |
| 1056 mcall_java->_bci = call_java->_bci; | |
| 1057 mcall_java->_optimized_virtual = call_java->is_optimized_virtual(); | |
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1058 is_method_handle_invoke = call_java->is_method_handle_invoke(); |
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1059 mcall_java->_method_handle_invoke = is_method_handle_invoke; |
| 0 | 1060 if( mcall_java->is_MachCallStaticJava() ) |
| 1061 mcall_java->as_MachCallStaticJava()->_name = | |
| 1062 call_java->as_CallStaticJava()->_name; | |
| 1063 if( mcall_java->is_MachCallDynamicJava() ) | |
| 1064 mcall_java->as_MachCallDynamicJava()->_vtable_index = | |
| 1065 call_java->as_CallDynamicJava()->_vtable_index; | |
| 1066 } | |
| 1067 else if( mcall->is_MachCallRuntime() ) { | |
| 1068 mcall->as_MachCallRuntime()->_name = call->as_CallRuntime()->_name; | |
| 1069 } | |
| 1070 msfpt = mcall; | |
| 1071 } | |
| 1072 // This is a non-call safepoint | |
| 1073 else { | |
| 1074 call = NULL; | |
| 1075 domain = NULL; | |
| 1076 MachNode *mn = match_tree(sfpt); | |
| 1077 if (C->failing()) return NULL; | |
| 1078 msfpt = mn->as_MachSafePoint(); | |
| 1079 cnt = TypeFunc::Parms; | |
| 1080 } | |
| 1081 | |
| 1082 // Advertise the correct memory effects (for anti-dependence computation). | |
| 1083 msfpt->set_adr_type(sfpt->adr_type()); | |
| 1084 | |
| 1085 // Allocate a private array of RegMasks. These RegMasks are not shared. | |
| 1086 msfpt->_in_rms = NEW_RESOURCE_ARRAY( RegMask, cnt ); | |
| 1087 // Empty them all. | |
| 1088 memset( msfpt->_in_rms, 0, sizeof(RegMask)*cnt ); | |
| 1089 | |
| 1090 // Do all the pre-defined non-Empty register masks | |
| 1091 msfpt->_in_rms[TypeFunc::ReturnAdr] = _return_addr_mask; | |
| 1092 msfpt->_in_rms[TypeFunc::FramePtr ] = c_frame_ptr_mask; | |
| 1093 | |
| 1094 // Place first outgoing argument can possibly be put. | |
| 1095 OptoReg::Name begin_out_arg_area = OptoReg::add(_new_SP, C->out_preserve_stack_slots()); | |
| 1096 assert( is_even(begin_out_arg_area), "" ); | |
| 1097 // Compute max outgoing register number per call site. | |
| 1098 OptoReg::Name out_arg_limit_per_call = begin_out_arg_area; | |
| 1099 // Calls to C may hammer extra stack slots above and beyond any arguments. | |
| 1100 // These are usually backing store for register arguments for varargs. | |
| 1101 if( call != NULL && call->is_CallRuntime() ) | |
| 1102 out_arg_limit_per_call = OptoReg::add(out_arg_limit_per_call,C->varargs_C_out_slots_killed()); | |
| 1103 | |
| 1104 | |
| 1105 // Do the normal argument list (parameters) register masks | |
| 1106 int argcnt = cnt - TypeFunc::Parms; | |
| 1107 if( argcnt > 0 ) { // Skip it all if we have no args | |
| 1108 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, argcnt ); | |
| 1109 VMRegPair *parm_regs = NEW_RESOURCE_ARRAY( VMRegPair, argcnt ); | |
| 1110 int i; | |
| 1111 for( i = 0; i < argcnt; i++ ) { | |
| 1112 sig_bt[i] = domain->field_at(i+TypeFunc::Parms)->basic_type(); | |
| 1113 } | |
| 1114 // V-call to pick proper calling convention | |
| 1115 call->calling_convention( sig_bt, parm_regs, argcnt ); | |
| 1116 | |
| 1117 #ifdef ASSERT | |
| 1118 // Sanity check users' calling convention. Really handy during | |
| 1119 // the initial porting effort. Fairly expensive otherwise. | |
| 1120 { for (int i = 0; i<argcnt; i++) { | |
| 1121 if( !parm_regs[i].first()->is_valid() && | |
| 1122 !parm_regs[i].second()->is_valid() ) continue; | |
| 1123 VMReg reg1 = parm_regs[i].first(); | |
| 1124 VMReg reg2 = parm_regs[i].second(); | |
| 1125 for (int j = 0; j < i; j++) { | |
| 1126 if( !parm_regs[j].first()->is_valid() && | |
| 1127 !parm_regs[j].second()->is_valid() ) continue; | |
| 1128 VMReg reg3 = parm_regs[j].first(); | |
| 1129 VMReg reg4 = parm_regs[j].second(); | |
| 1130 if( !reg1->is_valid() ) { | |
| 1131 assert( !reg2->is_valid(), "valid halvsies" ); | |
| 1132 } else if( !reg3->is_valid() ) { | |
| 1133 assert( !reg4->is_valid(), "valid halvsies" ); | |
| 1134 } else { | |
| 1135 assert( reg1 != reg2, "calling conv. must produce distinct regs"); | |
| 1136 assert( reg1 != reg3, "calling conv. must produce distinct regs"); | |
| 1137 assert( reg1 != reg4, "calling conv. must produce distinct regs"); | |
| 1138 assert( reg2 != reg3, "calling conv. must produce distinct regs"); | |
| 1139 assert( reg2 != reg4 || !reg2->is_valid(), "calling conv. must produce distinct regs"); | |
| 1140 assert( reg3 != reg4, "calling conv. must produce distinct regs"); | |
| 1141 } | |
| 1142 } | |
| 1143 } | |
| 1144 } | |
| 1145 #endif | |
| 1146 | |
| 1147 // Visit each argument. Compute its outgoing register mask. | |
| 1148 // Return results now can have 2 bits returned. | |
| 1149 // Compute max over all outgoing arguments both per call-site | |
| 1150 // and over the entire method. | |
| 1151 for( i = 0; i < argcnt; i++ ) { | |
| 1152 // Address of incoming argument mask to fill in | |
| 1153 RegMask *rm = &mcall->_in_rms[i+TypeFunc::Parms]; | |
| 1154 if( !parm_regs[i].first()->is_valid() && | |
| 1155 !parm_regs[i].second()->is_valid() ) { | |
| 1156 continue; // Avoid Halves | |
| 1157 } | |
| 1158 // Grab first register, adjust stack slots and insert in mask. | |
| 1159 OptoReg::Name reg1 = warp_outgoing_stk_arg(parm_regs[i].first(), begin_out_arg_area, out_arg_limit_per_call ); | |
| 1160 if (OptoReg::is_valid(reg1)) | |
| 1161 rm->Insert( reg1 ); | |
| 1162 // Grab second register (if any), adjust stack slots and insert in mask. | |
| 1163 OptoReg::Name reg2 = warp_outgoing_stk_arg(parm_regs[i].second(), begin_out_arg_area, out_arg_limit_per_call ); | |
| 1164 if (OptoReg::is_valid(reg2)) | |
| 1165 rm->Insert( reg2 ); | |
| 1166 } // End of for all arguments | |
| 1167 | |
| 1168 // Compute number of stack slots needed to restore stack in case of | |
| 1169 // Pascal-style argument popping. | |
| 1170 mcall->_argsize = out_arg_limit_per_call - begin_out_arg_area; | |
| 1171 } | |
| 1172 | |
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1173 if (is_method_handle_invoke) { |
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1174 // Kill some extra stack space in case method handles want to do |
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1175 // a little in-place argument insertion. |
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1176 int regs_per_word = NOT_LP64(1) LP64_ONLY(2); // %%% make a global const! |
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1177 out_arg_limit_per_call += MethodHandlePushLimit * regs_per_word; |
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1178 // Do not update mcall->_argsize because (a) the extra space is not |
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1179 // pushed as arguments and (b) _argsize is dead (not used anywhere). |
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1180 } |
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1181 |
| 0 | 1182 // Compute the max stack slot killed by any call. These will not be |
| 1183 // available for debug info, and will be used to adjust FIRST_STACK_mask | |
| 1184 // after all call sites have been visited. | |
| 1185 if( _out_arg_limit < out_arg_limit_per_call) | |
| 1186 _out_arg_limit = out_arg_limit_per_call; | |
| 1187 | |
| 1188 if (mcall) { | |
| 1189 // Kill the outgoing argument area, including any non-argument holes and | |
| 1190 // any legacy C-killed slots. Use Fat-Projections to do the killing. | |
| 1191 // Since the max-per-method covers the max-per-call-site and debug info | |
| 1192 // is excluded on the max-per-method basis, debug info cannot land in | |
| 1193 // this killed area. | |
| 1194 uint r_cnt = mcall->tf()->range()->cnt(); | |
| 1195 MachProjNode *proj = new (C, 1) MachProjNode( mcall, r_cnt+10000, RegMask::Empty, MachProjNode::fat_proj ); | |
| 1196 if (!RegMask::can_represent(OptoReg::Name(out_arg_limit_per_call-1))) { | |
| 1197 C->record_method_not_compilable_all_tiers("unsupported outgoing calling sequence"); | |
| 1198 } else { | |
| 1199 for (int i = begin_out_arg_area; i < out_arg_limit_per_call; i++) | |
| 1200 proj->_rout.Insert(OptoReg::Name(i)); | |
| 1201 } | |
| 1202 if( proj->_rout.is_NotEmpty() ) | |
| 1203 _proj_list.push(proj); | |
| 1204 } | |
| 1205 // Transfer the safepoint information from the call to the mcall | |
| 1206 // Move the JVMState list | |
| 1207 msfpt->set_jvms(sfpt->jvms()); | |
| 1208 for (JVMState* jvms = msfpt->jvms(); jvms; jvms = jvms->caller()) { | |
| 1209 jvms->set_map(sfpt); | |
| 1210 } | |
| 1211 | |
| 1212 // Debug inputs begin just after the last incoming parameter | |
| 1213 assert( (mcall == NULL) || (mcall->jvms() == NULL) || | |
| 1214 (mcall->jvms()->debug_start() + mcall->_jvmadj == mcall->tf()->domain()->cnt()), "" ); | |
| 1215 | |
| 1216 // Move the OopMap | |
| 1217 msfpt->_oop_map = sfpt->_oop_map; | |
| 1218 | |
| 1219 // Registers killed by the call are set in the local scheduling pass | |
| 1220 // of Global Code Motion. | |
| 1221 return msfpt; | |
| 1222 } | |
| 1223 | |
| 1224 //---------------------------match_tree---------------------------------------- | |
| 1225 // Match a Ideal Node DAG - turn it into a tree; Label & Reduce. Used as part | |
| 1226 // of the whole-sale conversion from Ideal to Mach Nodes. Also used for | |
| 1227 // making GotoNodes while building the CFG and in init_spill_mask() to identify | |
| 1228 // a Load's result RegMask for memoization in idealreg2regmask[] | |
| 1229 MachNode *Matcher::match_tree( const Node *n ) { | |
| 1230 assert( n->Opcode() != Op_Phi, "cannot match" ); | |
| 1231 assert( !n->is_block_start(), "cannot match" ); | |
| 1232 // Set the mark for all locally allocated State objects. | |
| 1233 // When this call returns, the _states_arena arena will be reset | |
| 1234 // freeing all State objects. | |
| 1235 ResourceMark rm( &_states_arena ); | |
| 1236 | |
| 1237 LabelRootDepth = 0; | |
| 1238 | |
| 1239 // StoreNodes require their Memory input to match any LoadNodes | |
| 1240 Node *mem = n->is_Store() ? n->in(MemNode::Memory) : (Node*)1 ; | |
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1241 #ifdef ASSERT |
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1242 Node* save_mem_node = _mem_node; |
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1243 _mem_node = n->is_Store() ? (Node*)n : NULL; |
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1244 #endif |
| 0 | 1245 // State object for root node of match tree |
| 1246 // Allocate it on _states_arena - stack allocation can cause stack overflow. | |
| 1247 State *s = new (&_states_arena) State; | |
| 1248 s->_kids[0] = NULL; | |
| 1249 s->_kids[1] = NULL; | |
| 1250 s->_leaf = (Node*)n; | |
| 1251 // Label the input tree, allocating labels from top-level arena | |
| 1252 Label_Root( n, s, n->in(0), mem ); | |
| 1253 if (C->failing()) return NULL; | |
| 1254 | |
| 1255 // The minimum cost match for the whole tree is found at the root State | |
| 1256 uint mincost = max_juint; | |
| 1257 uint cost = max_juint; | |
| 1258 uint i; | |
| 1259 for( i = 0; i < NUM_OPERANDS; i++ ) { | |
| 1260 if( s->valid(i) && // valid entry and | |
| 1261 s->_cost[i] < cost && // low cost and | |
| 1262 s->_rule[i] >= NUM_OPERANDS ) // not an operand | |
| 1263 cost = s->_cost[mincost=i]; | |
| 1264 } | |
| 1265 if (mincost == max_juint) { | |
| 1266 #ifndef PRODUCT | |
| 1267 tty->print("No matching rule for:"); | |
| 1268 s->dump(); | |
| 1269 #endif | |
| 1270 Matcher::soft_match_failure(); | |
| 1271 return NULL; | |
| 1272 } | |
| 1273 // Reduce input tree based upon the state labels to machine Nodes | |
| 1274 MachNode *m = ReduceInst( s, s->_rule[mincost], mem ); | |
| 1275 #ifdef ASSERT | |
| 1276 _old2new_map.map(n->_idx, m); | |
| 222 | 1277 _new2old_map.map(m->_idx, (Node*)n); |
| 0 | 1278 #endif |
| 1279 | |
| 1280 // Add any Matcher-ignored edges | |
| 1281 uint cnt = n->req(); | |
| 1282 uint start = 1; | |
| 1283 if( mem != (Node*)1 ) start = MemNode::Memory+1; | |
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1284 if( n->is_AddP() ) { |
| 0 | 1285 assert( mem == (Node*)1, "" ); |
| 1286 start = AddPNode::Base+1; | |
| 1287 } | |
| 1288 for( i = start; i < cnt; i++ ) { | |
| 1289 if( !n->match_edge(i) ) { | |
| 1290 if( i < m->req() ) | |
| 1291 m->ins_req( i, n->in(i) ); | |
| 1292 else | |
| 1293 m->add_req( n->in(i) ); | |
| 1294 } | |
| 1295 } | |
| 1296 | |
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1297 debug_only( _mem_node = save_mem_node; ) |
| 0 | 1298 return m; |
| 1299 } | |
| 1300 | |
| 1301 | |
| 1302 //------------------------------match_into_reg--------------------------------- | |
| 1303 // Choose to either match this Node in a register or part of the current | |
| 1304 // match tree. Return true for requiring a register and false for matching | |
| 1305 // as part of the current match tree. | |
| 1306 static bool match_into_reg( const Node *n, Node *m, Node *control, int i, bool shared ) { | |
| 1307 | |
| 1308 const Type *t = m->bottom_type(); | |
| 1309 | |
| 1310 if( t->singleton() ) { | |
| 1311 // Never force constants into registers. Allow them to match as | |
| 1312 // constants or registers. Copies of the same value will share | |
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1313 // the same register. See find_shared_node. |
| 0 | 1314 return false; |
| 1315 } else { // Not a constant | |
| 1316 // Stop recursion if they have different Controls. | |
| 1317 // Slot 0 of constants is not really a Control. | |
| 1318 if( control && m->in(0) && control != m->in(0) ) { | |
| 1319 | |
| 1320 // Actually, we can live with the most conservative control we | |
| 1321 // find, if it post-dominates the others. This allows us to | |
| 1322 // pick up load/op/store trees where the load can float a little | |
| 1323 // above the store. | |
| 1324 Node *x = control; | |
| 1325 const uint max_scan = 6; // Arbitrary scan cutoff | |
| 1326 uint j; | |
| 1327 for( j=0; j<max_scan; j++ ) { | |
| 1328 if( x->is_Region() ) // Bail out at merge points | |
| 1329 return true; | |
| 1330 x = x->in(0); | |
| 1331 if( x == m->in(0) ) // Does 'control' post-dominate | |
| 1332 break; // m->in(0)? If so, we can use it | |
| 1333 } | |
| 1334 if( j == max_scan ) // No post-domination before scan end? | |
| 1335 return true; // Then break the match tree up | |
| 1336 } | |
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1337 if (m->is_DecodeN() && Matcher::clone_shift_expressions) { |
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1338 // These are commonly used in address expressions and can |
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1339 // efficiently fold into them on X64 in some cases. |
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1340 return false; |
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1341 } |
| 0 | 1342 } |
| 1343 | |
| 605 | 1344 // Not forceable cloning. If shared, put it into a register. |
| 0 | 1345 return shared; |
| 1346 } | |
| 1347 | |
| 1348 | |
| 1349 //------------------------------Instruction Selection-------------------------- | |
| 1350 // Label method walks a "tree" of nodes, using the ADLC generated DFA to match | |
| 1351 // ideal nodes to machine instructions. Trees are delimited by shared Nodes, | |
| 1352 // things the Matcher does not match (e.g., Memory), and things with different | |
| 1353 // Controls (hence forced into different blocks). We pass in the Control | |
| 1354 // selected for this entire State tree. | |
| 1355 | |
| 1356 // The Matcher works on Trees, but an Intel add-to-memory requires a DAG: the | |
| 1357 // Store and the Load must have identical Memories (as well as identical | |
| 1358 // pointers). Since the Matcher does not have anything for Memory (and | |
| 1359 // does not handle DAGs), I have to match the Memory input myself. If the | |
| 1360 // Tree root is a Store, I require all Loads to have the identical memory. | |
| 1361 Node *Matcher::Label_Root( const Node *n, State *svec, Node *control, const Node *mem){ | |
| 1362 // Since Label_Root is a recursive function, its possible that we might run | |
| 1363 // out of stack space. See bugs 6272980 & 6227033 for more info. | |
| 1364 LabelRootDepth++; | |
| 1365 if (LabelRootDepth > MaxLabelRootDepth) { | |
| 1366 C->record_method_not_compilable_all_tiers("Out of stack space, increase MaxLabelRootDepth"); | |
| 1367 return NULL; | |
| 1368 } | |
| 1369 uint care = 0; // Edges matcher cares about | |
| 1370 uint cnt = n->req(); | |
| 1371 uint i = 0; | |
| 1372 | |
| 1373 // Examine children for memory state | |
| 1374 // Can only subsume a child into your match-tree if that child's memory state | |
| 1375 // is not modified along the path to another input. | |
| 1376 // It is unsafe even if the other inputs are separate roots. | |
| 1377 Node *input_mem = NULL; | |
| 1378 for( i = 1; i < cnt; i++ ) { | |
| 1379 if( !n->match_edge(i) ) continue; | |
| 1380 Node *m = n->in(i); // Get ith input | |
| 1381 assert( m, "expect non-null children" ); | |
| 1382 if( m->is_Load() ) { | |
| 1383 if( input_mem == NULL ) { | |
| 1384 input_mem = m->in(MemNode::Memory); | |
| 1385 } else if( input_mem != m->in(MemNode::Memory) ) { | |
| 1386 input_mem = NodeSentinel; | |
| 1387 } | |
| 1388 } | |
| 1389 } | |
| 1390 | |
| 1391 for( i = 1; i < cnt; i++ ){// For my children | |
| 1392 if( !n->match_edge(i) ) continue; | |
| 1393 Node *m = n->in(i); // Get ith input | |
| 1394 // Allocate states out of a private arena | |
| 1395 State *s = new (&_states_arena) State; | |
| 1396 svec->_kids[care++] = s; | |
| 1397 assert( care <= 2, "binary only for now" ); | |
| 1398 | |
| 1399 // Recursively label the State tree. | |
| 1400 s->_kids[0] = NULL; | |
| 1401 s->_kids[1] = NULL; | |
| 1402 s->_leaf = m; | |
| 1403 | |
| 1404 // Check for leaves of the State Tree; things that cannot be a part of | |
| 1405 // the current tree. If it finds any, that value is matched as a | |
| 1406 // register operand. If not, then the normal matching is used. | |
| 1407 if( match_into_reg(n, m, control, i, is_shared(m)) || | |
| 1408 // | |
| 1409 // Stop recursion if this is LoadNode and the root of this tree is a | |
| 1410 // StoreNode and the load & store have different memories. | |
| 1411 ((mem!=(Node*)1) && m->is_Load() && m->in(MemNode::Memory) != mem) || | |
| 1412 // Can NOT include the match of a subtree when its memory state | |
| 1413 // is used by any of the other subtrees | |
| 1414 (input_mem == NodeSentinel) ) { | |
| 1415 #ifndef PRODUCT | |
| 1416 // Print when we exclude matching due to different memory states at input-loads | |
| 1417 if( PrintOpto && (Verbose && WizardMode) && (input_mem == NodeSentinel) | |
| 1418 && !((mem!=(Node*)1) && m->is_Load() && m->in(MemNode::Memory) != mem) ) { | |
| 1419 tty->print_cr("invalid input_mem"); | |
| 1420 } | |
| 1421 #endif | |
| 1422 // Switch to a register-only opcode; this value must be in a register | |
| 1423 // and cannot be subsumed as part of a larger instruction. | |
| 1424 s->DFA( m->ideal_reg(), m ); | |
| 1425 | |
| 1426 } else { | |
| 1427 // If match tree has no control and we do, adopt it for entire tree | |
| 1428 if( control == NULL && m->in(0) != NULL && m->req() > 1 ) | |
| 1429 control = m->in(0); // Pick up control | |
| 1430 // Else match as a normal part of the match tree. | |
| 1431 control = Label_Root(m,s,control,mem); | |
| 1432 if (C->failing()) return NULL; | |
| 1433 } | |
| 1434 } | |
| 1435 | |
| 1436 | |
| 1437 // Call DFA to match this node, and return | |
| 1438 svec->DFA( n->Opcode(), n ); | |
| 1439 | |
| 1440 #ifdef ASSERT | |
| 1441 uint x; | |
| 1442 for( x = 0; x < _LAST_MACH_OPER; x++ ) | |
| 1443 if( svec->valid(x) ) | |
| 1444 break; | |
| 1445 | |
| 1446 if (x >= _LAST_MACH_OPER) { | |
| 1447 n->dump(); | |
| 1448 svec->dump(); | |
| 1449 assert( false, "bad AD file" ); | |
| 1450 } | |
| 1451 #endif | |
| 1452 return control; | |
| 1453 } | |
| 1454 | |
| 1455 | |
| 1456 // Con nodes reduced using the same rule can share their MachNode | |
| 1457 // which reduces the number of copies of a constant in the final | |
| 1458 // program. The register allocator is free to split uses later to | |
| 1459 // split live ranges. | |
|
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1460 MachNode* Matcher::find_shared_node(Node* leaf, uint rule) { |
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1461 if (!leaf->is_Con() && !leaf->is_DecodeN()) return NULL; |
| 0 | 1462 |
| 1463 // See if this Con has already been reduced using this rule. | |
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1464 if (_shared_nodes.Size() <= leaf->_idx) return NULL; |
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1465 MachNode* last = (MachNode*)_shared_nodes.at(leaf->_idx); |
| 0 | 1466 if (last != NULL && rule == last->rule()) { |
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1467 // Don't expect control change for DecodeN |
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1468 if (leaf->is_DecodeN()) |
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1469 return last; |
| 0 | 1470 // Get the new space root. |
| 1471 Node* xroot = new_node(C->root()); | |
| 1472 if (xroot == NULL) { | |
| 1473 // This shouldn't happen give the order of matching. | |
| 1474 return NULL; | |
| 1475 } | |
| 1476 | |
| 1477 // Shared constants need to have their control be root so they | |
| 1478 // can be scheduled properly. | |
| 1479 Node* control = last->in(0); | |
| 1480 if (control != xroot) { | |
| 1481 if (control == NULL || control == C->root()) { | |
| 1482 last->set_req(0, xroot); | |
| 1483 } else { | |
| 1484 assert(false, "unexpected control"); | |
| 1485 return NULL; | |
| 1486 } | |
| 1487 } | |
| 1488 return last; | |
| 1489 } | |
| 1490 return NULL; | |
| 1491 } | |
| 1492 | |
| 1493 | |
| 1494 //------------------------------ReduceInst------------------------------------- | |
| 1495 // Reduce a State tree (with given Control) into a tree of MachNodes. | |
| 1496 // This routine (and it's cohort ReduceOper) convert Ideal Nodes into | |
| 1497 // complicated machine Nodes. Each MachNode covers some tree of Ideal Nodes. | |
| 1498 // Each MachNode has a number of complicated MachOper operands; each | |
| 1499 // MachOper also covers a further tree of Ideal Nodes. | |
| 1500 | |
| 1501 // The root of the Ideal match tree is always an instruction, so we enter | |
| 1502 // the recursion here. After building the MachNode, we need to recurse | |
| 1503 // the tree checking for these cases: | |
| 1504 // (1) Child is an instruction - | |
| 1505 // Build the instruction (recursively), add it as an edge. | |
| 1506 // Build a simple operand (register) to hold the result of the instruction. | |
| 1507 // (2) Child is an interior part of an instruction - | |
| 1508 // Skip over it (do nothing) | |
| 1509 // (3) Child is the start of a operand - | |
| 1510 // Build the operand, place it inside the instruction | |
| 1511 // Call ReduceOper. | |
| 1512 MachNode *Matcher::ReduceInst( State *s, int rule, Node *&mem ) { | |
| 1513 assert( rule >= NUM_OPERANDS, "called with operand rule" ); | |
| 1514 | |
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1515 MachNode* shared_node = find_shared_node(s->_leaf, rule); |
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1516 if (shared_node != NULL) { |
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1517 return shared_node; |
| 0 | 1518 } |
| 1519 | |
| 1520 // Build the object to represent this state & prepare for recursive calls | |
| 1521 MachNode *mach = s->MachNodeGenerator( rule, C ); | |
| 1522 mach->_opnds[0] = s->MachOperGenerator( _reduceOp[rule], C ); | |
| 1523 assert( mach->_opnds[0] != NULL, "Missing result operand" ); | |
| 1524 Node *leaf = s->_leaf; | |
| 1525 // Check for instruction or instruction chain rule | |
| 1526 if( rule >= _END_INST_CHAIN_RULE || rule < _BEGIN_INST_CHAIN_RULE ) { | |
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1527 assert(C->node_arena()->contains(s->_leaf) || !has_new_node(s->_leaf), |
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1528 "duplicating node that's already been matched"); |
| 0 | 1529 // Instruction |
| 1530 mach->add_req( leaf->in(0) ); // Set initial control | |
| 1531 // Reduce interior of complex instruction | |
| 1532 ReduceInst_Interior( s, rule, mem, mach, 1 ); | |
| 1533 } else { | |
| 1534 // Instruction chain rules are data-dependent on their inputs | |
| 1535 mach->add_req(0); // Set initial control to none | |
| 1536 ReduceInst_Chain_Rule( s, rule, mem, mach ); | |
| 1537 } | |
| 1538 | |
| 1539 // If a Memory was used, insert a Memory edge | |
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1540 if( mem != (Node*)1 ) { |
| 0 | 1541 mach->ins_req(MemNode::Memory,mem); |
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1542 #ifdef ASSERT |
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1543 // Verify adr type after matching memory operation |
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1544 const MachOper* oper = mach->memory_operand(); |
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1545 if (oper != NULL && oper != (MachOper*)-1) { |
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1546 // It has a unique memory operand. Find corresponding ideal mem node. |
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1547 Node* m = NULL; |
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1548 if (leaf->is_Mem()) { |
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1549 m = leaf; |
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1550 } else { |
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1551 m = _mem_node; |
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1552 assert(m != NULL && m->is_Mem(), "expecting memory node"); |
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1553 } |
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1554 const Type* mach_at = mach->adr_type(); |
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1555 // DecodeN node consumed by an address may have different type |
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1556 // then its input. Don't compare types for such case. |
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1557 if (m->adr_type() != mach_at && |
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1558 (m->in(MemNode::Address)->is_DecodeN() || |
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1559 m->in(MemNode::Address)->is_AddP() && |
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1560 m->in(MemNode::Address)->in(AddPNode::Address)->is_DecodeN() || |
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1561 m->in(MemNode::Address)->is_AddP() && |
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1562 m->in(MemNode::Address)->in(AddPNode::Address)->is_AddP() && |
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1563 m->in(MemNode::Address)->in(AddPNode::Address)->in(AddPNode::Address)->is_DecodeN())) { |
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1564 mach_at = m->adr_type(); |
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1565 } |
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1566 if (m->adr_type() != mach_at) { |
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1567 m->dump(); |
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1568 tty->print_cr("mach:"); |
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1569 mach->dump(1); |
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1570 } |
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1571 assert(m->adr_type() == mach_at, "matcher should not change adr type"); |
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1572 } |
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1573 #endif |
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1574 } |
| 0 | 1575 |
| 1576 // If the _leaf is an AddP, insert the base edge | |
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1577 if( leaf->is_AddP() ) |
| 0 | 1578 mach->ins_req(AddPNode::Base,leaf->in(AddPNode::Base)); |
| 1579 | |
| 1580 uint num_proj = _proj_list.size(); | |
| 1581 | |
| 1582 // Perform any 1-to-many expansions required | |
| 1203 | 1583 MachNode *ex = mach->Expand(s,_proj_list, mem); |
| 0 | 1584 if( ex != mach ) { |
| 1585 assert(ex->ideal_reg() == mach->ideal_reg(), "ideal types should match"); | |
| 1586 if( ex->in(1)->is_Con() ) | |
| 1587 ex->in(1)->set_req(0, C->root()); | |
| 1588 // Remove old node from the graph | |
| 1589 for( uint i=0; i<mach->req(); i++ ) { | |
| 1590 mach->set_req(i,NULL); | |
| 1591 } | |
| 222 | 1592 #ifdef ASSERT |
| 1593 _new2old_map.map(ex->_idx, s->_leaf); | |
| 1594 #endif | |
| 0 | 1595 } |
| 1596 | |
| 1597 // PhaseChaitin::fixup_spills will sometimes generate spill code | |
| 1598 // via the matcher. By the time, nodes have been wired into the CFG, | |
| 1599 // and any further nodes generated by expand rules will be left hanging | |
| 1600 // in space, and will not get emitted as output code. Catch this. | |
| 1601 // Also, catch any new register allocation constraints ("projections") | |
| 1602 // generated belatedly during spill code generation. | |
| 1603 if (_allocation_started) { | |
| 1604 guarantee(ex == mach, "no expand rules during spill generation"); | |
| 1605 guarantee(_proj_list.size() == num_proj, "no allocation during spill generation"); | |
| 1606 } | |
| 1607 | |
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1608 if (leaf->is_Con() || leaf->is_DecodeN()) { |
| 0 | 1609 // Record the con for sharing |
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1610 _shared_nodes.map(leaf->_idx, ex); |
| 0 | 1611 } |
| 1612 | |
| 1613 return ex; | |
| 1614 } | |
| 1615 | |
| 1616 void Matcher::ReduceInst_Chain_Rule( State *s, int rule, Node *&mem, MachNode *mach ) { | |
| 1617 // 'op' is what I am expecting to receive | |
| 1618 int op = _leftOp[rule]; | |
| 1619 // Operand type to catch childs result | |
| 1620 // This is what my child will give me. | |
| 1621 int opnd_class_instance = s->_rule[op]; | |
| 1622 // Choose between operand class or not. | |
| 605 | 1623 // This is what I will receive. |
| 0 | 1624 int catch_op = (FIRST_OPERAND_CLASS <= op && op < NUM_OPERANDS) ? opnd_class_instance : op; |
| 1625 // New rule for child. Chase operand classes to get the actual rule. | |
| 1626 int newrule = s->_rule[catch_op]; | |
| 1627 | |
| 1628 if( newrule < NUM_OPERANDS ) { | |
| 1629 // Chain from operand or operand class, may be output of shared node | |
| 1630 assert( 0 <= opnd_class_instance && opnd_class_instance < NUM_OPERANDS, | |
| 1631 "Bad AD file: Instruction chain rule must chain from operand"); | |
| 1632 // Insert operand into array of operands for this instruction | |
| 1633 mach->_opnds[1] = s->MachOperGenerator( opnd_class_instance, C ); | |
| 1634 | |
| 1635 ReduceOper( s, newrule, mem, mach ); | |
| 1636 } else { | |
| 1637 // Chain from the result of an instruction | |
| 1638 assert( newrule >= _LAST_MACH_OPER, "Do NOT chain from internal operand"); | |
| 1639 mach->_opnds[1] = s->MachOperGenerator( _reduceOp[catch_op], C ); | |
| 1640 Node *mem1 = (Node*)1; | |
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1641 debug_only(Node *save_mem_node = _mem_node;) |
| 0 | 1642 mach->add_req( ReduceInst(s, newrule, mem1) ); |
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1643 debug_only(_mem_node = save_mem_node;) |
| 0 | 1644 } |
| 1645 return; | |
| 1646 } | |
| 1647 | |
| 1648 | |
| 1649 uint Matcher::ReduceInst_Interior( State *s, int rule, Node *&mem, MachNode *mach, uint num_opnds ) { | |
| 1650 if( s->_leaf->is_Load() ) { | |
| 1651 Node *mem2 = s->_leaf->in(MemNode::Memory); | |
| 1652 assert( mem == (Node*)1 || mem == mem2, "multiple Memories being matched at once?" ); | |
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1653 debug_only( if( mem == (Node*)1 ) _mem_node = s->_leaf;) |
| 0 | 1654 mem = mem2; |
| 1655 } | |
| 1656 if( s->_leaf->in(0) != NULL && s->_leaf->req() > 1) { | |
| 1657 if( mach->in(0) == NULL ) | |
| 1658 mach->set_req(0, s->_leaf->in(0)); | |
| 1659 } | |
| 1660 | |
| 1661 // Now recursively walk the state tree & add operand list. | |
| 1662 for( uint i=0; i<2; i++ ) { // binary tree | |
| 1663 State *newstate = s->_kids[i]; | |
| 1664 if( newstate == NULL ) break; // Might only have 1 child | |
| 1665 // 'op' is what I am expecting to receive | |
| 1666 int op; | |
| 1667 if( i == 0 ) { | |
| 1668 op = _leftOp[rule]; | |
| 1669 } else { | |
| 1670 op = _rightOp[rule]; | |
| 1671 } | |
| 1672 // Operand type to catch childs result | |
| 1673 // This is what my child will give me. | |
| 1674 int opnd_class_instance = newstate->_rule[op]; | |
| 1675 // Choose between operand class or not. | |
| 1676 // This is what I will receive. | |
| 1677 int catch_op = (op >= FIRST_OPERAND_CLASS && op < NUM_OPERANDS) ? opnd_class_instance : op; | |
| 1678 // New rule for child. Chase operand classes to get the actual rule. | |
| 1679 int newrule = newstate->_rule[catch_op]; | |
| 1680 | |
| 1681 if( newrule < NUM_OPERANDS ) { // Operand/operandClass or internalOp/instruction? | |
| 1682 // Operand/operandClass | |
| 1683 // Insert operand into array of operands for this instruction | |
| 1684 mach->_opnds[num_opnds++] = newstate->MachOperGenerator( opnd_class_instance, C ); | |
| 1685 ReduceOper( newstate, newrule, mem, mach ); | |
| 1686 | |
| 1687 } else { // Child is internal operand or new instruction | |
| 1688 if( newrule < _LAST_MACH_OPER ) { // internal operand or instruction? | |
| 1689 // internal operand --> call ReduceInst_Interior | |
| 1690 // Interior of complex instruction. Do nothing but recurse. | |
| 1691 num_opnds = ReduceInst_Interior( newstate, newrule, mem, mach, num_opnds ); | |
| 1692 } else { | |
| 1693 // instruction --> call build operand( ) to catch result | |
| 1694 // --> ReduceInst( newrule ) | |
| 1695 mach->_opnds[num_opnds++] = s->MachOperGenerator( _reduceOp[catch_op], C ); | |
| 1696 Node *mem1 = (Node*)1; | |
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1697 debug_only(Node *save_mem_node = _mem_node;) |
| 0 | 1698 mach->add_req( ReduceInst( newstate, newrule, mem1 ) ); |
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1699 debug_only(_mem_node = save_mem_node;) |
| 0 | 1700 } |
| 1701 } | |
| 1702 assert( mach->_opnds[num_opnds-1], "" ); | |
| 1703 } | |
| 1704 return num_opnds; | |
| 1705 } | |
| 1706 | |
| 1707 // This routine walks the interior of possible complex operands. | |
| 1708 // At each point we check our children in the match tree: | |
| 1709 // (1) No children - | |
| 1710 // We are a leaf; add _leaf field as an input to the MachNode | |
| 1711 // (2) Child is an internal operand - | |
| 1712 // Skip over it ( do nothing ) | |
| 1713 // (3) Child is an instruction - | |
| 1714 // Call ReduceInst recursively and | |
| 1715 // and instruction as an input to the MachNode | |
| 1716 void Matcher::ReduceOper( State *s, int rule, Node *&mem, MachNode *mach ) { | |
| 1717 assert( rule < _LAST_MACH_OPER, "called with operand rule" ); | |
| 1718 State *kid = s->_kids[0]; | |
| 1719 assert( kid == NULL || s->_leaf->in(0) == NULL, "internal operands have no control" ); | |
| 1720 | |
| 1721 // Leaf? And not subsumed? | |
| 1722 if( kid == NULL && !_swallowed[rule] ) { | |
| 1723 mach->add_req( s->_leaf ); // Add leaf pointer | |
| 1724 return; // Bail out | |
| 1725 } | |
| 1726 | |
| 1727 if( s->_leaf->is_Load() ) { | |
| 1728 assert( mem == (Node*)1, "multiple Memories being matched at once?" ); | |
| 1729 mem = s->_leaf->in(MemNode::Memory); | |
|
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1730 debug_only(_mem_node = s->_leaf;) |
| 0 | 1731 } |
| 1732 if( s->_leaf->in(0) && s->_leaf->req() > 1) { | |
| 1733 if( !mach->in(0) ) | |
| 1734 mach->set_req(0,s->_leaf->in(0)); | |
| 1735 else { | |
| 1736 assert( s->_leaf->in(0) == mach->in(0), "same instruction, differing controls?" ); | |
| 1737 } | |
| 1738 } | |
| 1739 | |
| 1740 for( uint i=0; kid != NULL && i<2; kid = s->_kids[1], i++ ) { // binary tree | |
| 1741 int newrule; | |
| 1742 if( i == 0 ) | |
| 1743 newrule = kid->_rule[_leftOp[rule]]; | |
| 1744 else | |
| 1745 newrule = kid->_rule[_rightOp[rule]]; | |
| 1746 | |
| 1747 if( newrule < _LAST_MACH_OPER ) { // Operand or instruction? | |
| 1748 // Internal operand; recurse but do nothing else | |
| 1749 ReduceOper( kid, newrule, mem, mach ); | |
| 1750 | |
| 1751 } else { // Child is a new instruction | |
| 1752 // Reduce the instruction, and add a direct pointer from this | |
| 1753 // machine instruction to the newly reduced one. | |
| 1754 Node *mem1 = (Node*)1; | |
|
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1755 debug_only(Node *save_mem_node = _mem_node;) |
| 0 | 1756 mach->add_req( ReduceInst( kid, newrule, mem1 ) ); |
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1757 debug_only(_mem_node = save_mem_node;) |
| 0 | 1758 } |
| 1759 } | |
| 1760 } | |
| 1761 | |
| 1762 | |
| 1763 // ------------------------------------------------------------------------- | |
| 1764 // Java-Java calling convention | |
| 1765 // (what you use when Java calls Java) | |
| 1766 | |
| 1767 //------------------------------find_receiver---------------------------------- | |
| 1768 // For a given signature, return the OptoReg for parameter 0. | |
| 1769 OptoReg::Name Matcher::find_receiver( bool is_outgoing ) { | |
| 1770 VMRegPair regs; | |
| 1771 BasicType sig_bt = T_OBJECT; | |
| 1772 calling_convention(&sig_bt, ®s, 1, is_outgoing); | |
| 1773 // Return argument 0 register. In the LP64 build pointers | |
| 1774 // take 2 registers, but the VM wants only the 'main' name. | |
| 1775 return OptoReg::as_OptoReg(regs.first()); | |
| 1776 } | |
| 1777 | |
| 1778 // A method-klass-holder may be passed in the inline_cache_reg | |
| 1779 // and then expanded into the inline_cache_reg and a method_oop register | |
| 1780 // defined in ad_<arch>.cpp | |
| 1781 | |
| 1782 | |
| 1783 //------------------------------find_shared------------------------------------ | |
| 1784 // Set bits if Node is shared or otherwise a root | |
| 1785 void Matcher::find_shared( Node *n ) { | |
| 1786 // Allocate stack of size C->unique() * 2 to avoid frequent realloc | |
| 1787 MStack mstack(C->unique() * 2); | |
|
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1788 // Mark nodes as address_visited if they are inputs to an address expression |
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1789 VectorSet address_visited(Thread::current()->resource_area()); |
| 0 | 1790 mstack.push(n, Visit); // Don't need to pre-visit root node |
| 1791 while (mstack.is_nonempty()) { | |
| 1792 n = mstack.node(); // Leave node on stack | |
| 1793 Node_State nstate = mstack.state(); | |
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1794 uint nop = n->Opcode(); |
| 0 | 1795 if (nstate == Pre_Visit) { |
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1796 if (address_visited.test(n->_idx)) { // Visited in address already? |
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1797 // Flag as visited and shared now. |
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1798 set_visited(n); |
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1799 } |
| 0 | 1800 if (is_visited(n)) { // Visited already? |
| 1801 // Node is shared and has no reason to clone. Flag it as shared. | |
| 1802 // This causes it to match into a register for the sharing. | |
| 1803 set_shared(n); // Flag as shared and | |
| 1804 mstack.pop(); // remove node from stack | |
| 1805 continue; | |
| 1806 } | |
| 1807 nstate = Visit; // Not already visited; so visit now | |
| 1808 } | |
| 1809 if (nstate == Visit) { | |
| 1810 mstack.set_state(Post_Visit); | |
| 1811 set_visited(n); // Flag as visited now | |
| 1812 bool mem_op = false; | |
| 1813 | |
|
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1814 switch( nop ) { // Handle some opcodes special |
| 0 | 1815 case Op_Phi: // Treat Phis as shared roots |
| 1816 case Op_Parm: | |
| 1817 case Op_Proj: // All handled specially during matching | |
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1818 case Op_SafePointScalarObject: |
| 0 | 1819 set_shared(n); |
| 1820 set_dontcare(n); | |
| 1821 break; | |
| 1822 case Op_If: | |
| 1823 case Op_CountedLoopEnd: | |
| 1824 mstack.set_state(Alt_Post_Visit); // Alternative way | |
| 1825 // Convert (If (Bool (CmpX A B))) into (If (Bool) (CmpX A B)). Helps | |
| 1826 // with matching cmp/branch in 1 instruction. The Matcher needs the | |
| 1827 // Bool and CmpX side-by-side, because it can only get at constants | |
| 1828 // that are at the leaves of Match trees, and the Bool's condition acts | |
| 1829 // as a constant here. | |
| 1830 mstack.push(n->in(1), Visit); // Clone the Bool | |
| 1831 mstack.push(n->in(0), Pre_Visit); // Visit control input | |
| 1832 continue; // while (mstack.is_nonempty()) | |
| 1833 case Op_ConvI2D: // These forms efficiently match with a prior | |
| 1834 case Op_ConvI2F: // Load but not a following Store | |
| 1835 if( n->in(1)->is_Load() && // Prior load | |
| 1836 n->outcnt() == 1 && // Not already shared | |
| 1837 n->unique_out()->is_Store() ) // Following store | |
| 1838 set_shared(n); // Force it to be a root | |
| 1839 break; | |
| 1840 case Op_ReverseBytesI: | |
| 1841 case Op_ReverseBytesL: | |
| 1842 if( n->in(1)->is_Load() && // Prior load | |
| 1843 n->outcnt() == 1 ) // Not already shared | |
| 1844 set_shared(n); // Force it to be a root | |
| 1845 break; | |
| 1846 case Op_BoxLock: // Cant match until we get stack-regs in ADLC | |
| 1847 case Op_IfFalse: | |
| 1848 case Op_IfTrue: | |
| 1849 case Op_MachProj: | |
| 1850 case Op_MergeMem: | |
| 1851 case Op_Catch: | |
| 1852 case Op_CatchProj: | |
| 1853 case Op_CProj: | |
| 1854 case Op_JumpProj: | |
| 1855 case Op_JProj: | |
| 1856 case Op_NeverBranch: | |
| 1857 set_dontcare(n); | |
| 1858 break; | |
| 1859 case Op_Jump: | |
| 1860 mstack.push(n->in(1), Visit); // Switch Value | |
| 1861 mstack.push(n->in(0), Pre_Visit); // Visit Control input | |
| 1862 continue; // while (mstack.is_nonempty()) | |
| 1863 case Op_StrComp: | |
| 681 | 1864 case Op_StrEquals: |
| 1865 case Op_StrIndexOf: | |
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1866 case Op_AryEq: |
| 0 | 1867 set_shared(n); // Force result into register (it will be anyways) |
| 1868 break; | |
| 1869 case Op_ConP: { // Convert pointers above the centerline to NUL | |
| 1870 TypeNode *tn = n->as_Type(); // Constants derive from type nodes | |
| 1871 const TypePtr* tp = tn->type()->is_ptr(); | |
| 1872 if (tp->_ptr == TypePtr::AnyNull) { | |
| 1873 tn->set_type(TypePtr::NULL_PTR); | |
| 1874 } | |
| 1875 break; | |
| 1876 } | |
| 163 | 1877 case Op_ConN: { // Convert narrow pointers above the centerline to NUL |
| 1878 TypeNode *tn = n->as_Type(); // Constants derive from type nodes | |
|
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1879 const TypePtr* tp = tn->type()->make_ptr(); |
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1880 if (tp && tp->_ptr == TypePtr::AnyNull) { |
| 163 | 1881 tn->set_type(TypeNarrowOop::NULL_PTR); |
| 1882 } | |
| 1883 break; | |
| 1884 } | |
| 0 | 1885 case Op_Binary: // These are introduced in the Post_Visit state. |
| 1886 ShouldNotReachHere(); | |
| 1887 break; | |
| 1888 case Op_ClearArray: | |
| 1889 case Op_SafePoint: | |
| 1890 mem_op = true; | |
| 1891 break; | |
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1892 default: |
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1893 if( n->is_Store() ) { |
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1894 // Do match stores, despite no ideal reg |
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1895 mem_op = true; |
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1896 break; |
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1897 } |
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1898 if( n->is_Mem() ) { // Loads and LoadStores |
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1899 mem_op = true; |
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1900 // Loads must be root of match tree due to prior load conflict |
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1901 if( C->subsume_loads() == false ) |
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1902 set_shared(n); |
| 0 | 1903 } |
| 1904 // Fall into default case | |
| 1905 if( !n->ideal_reg() ) | |
| 1906 set_dontcare(n); // Unmatchable Nodes | |
| 1907 } // end_switch | |
| 1908 | |
| 1909 for(int i = n->req() - 1; i >= 0; --i) { // For my children | |
| 1910 Node *m = n->in(i); // Get ith input | |
| 1911 if (m == NULL) continue; // Ignore NULLs | |
| 1912 uint mop = m->Opcode(); | |
| 1913 | |
| 1914 // Must clone all producers of flags, or we will not match correctly. | |
| 1915 // Suppose a compare setting int-flags is shared (e.g., a switch-tree) | |
| 1916 // then it will match into an ideal Op_RegFlags. Alas, the fp-flags | |
| 1917 // are also there, so we may match a float-branch to int-flags and | |
| 1918 // expect the allocator to haul the flags from the int-side to the | |
| 1919 // fp-side. No can do. | |
| 1920 if( _must_clone[mop] ) { | |
| 1921 mstack.push(m, Visit); | |
| 1922 continue; // for(int i = ...) | |
| 1923 } | |
| 1924 | |
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1925 if( mop == Op_AddP && m->in(AddPNode::Base)->Opcode() == Op_DecodeN ) { |
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1926 // Bases used in addresses must be shared but since |
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1927 // they are shared through a DecodeN they may appear |
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1928 // to have a single use so force sharing here. |
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1929 set_shared(m->in(AddPNode::Base)->in(1)); |
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1930 } |
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1931 |
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1932 // Clone addressing expressions as they are "free" in memory access instructions |
| 0 | 1933 if( mem_op && i == MemNode::Address && mop == Op_AddP ) { |
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1934 // Some inputs for address expression are not put on stack |
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1935 // to avoid marking them as shared and forcing them into register |
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1936 // if they are used only in address expressions. |
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1937 // But they should be marked as shared if there are other uses |
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1938 // besides address expressions. |
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1939 |
| 0 | 1940 Node *off = m->in(AddPNode::Offset); |
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1941 if( off->is_Con() && |
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1942 // When there are other uses besides address expressions |
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1943 // put it on stack and mark as shared. |
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1944 !is_visited(m) ) { |
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1945 address_visited.test_set(m->_idx); // Flag as address_visited |
| 0 | 1946 Node *adr = m->in(AddPNode::Address); |
| 1947 | |
| 1948 // Intel, ARM and friends can handle 2 adds in addressing mode | |
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1949 if( clone_shift_expressions && adr->is_AddP() && |
| 0 | 1950 // AtomicAdd is not an addressing expression. |
| 1951 // Cheap to find it by looking for screwy base. | |
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1952 !adr->in(AddPNode::Base)->is_top() && |
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1953 // Are there other uses besides address expressions? |
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1954 !is_visited(adr) ) { |
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1955 address_visited.set(adr->_idx); // Flag as address_visited |
| 0 | 1956 Node *shift = adr->in(AddPNode::Offset); |
| 1957 // Check for shift by small constant as well | |
| 1958 if( shift->Opcode() == Op_LShiftX && shift->in(2)->is_Con() && | |
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1959 shift->in(2)->get_int() <= 3 && |
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1960 // Are there other uses besides address expressions? |
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1961 !is_visited(shift) ) { |
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1962 address_visited.set(shift->_idx); // Flag as address_visited |
| 0 | 1963 mstack.push(shift->in(2), Visit); |
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1964 Node *conv = shift->in(1); |
| 0 | 1965 #ifdef _LP64 |
| 1966 // Allow Matcher to match the rule which bypass | |
| 1967 // ConvI2L operation for an array index on LP64 | |
| 1968 // if the index value is positive. | |
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1969 if( conv->Opcode() == Op_ConvI2L && |
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1970 conv->as_Type()->type()->is_long()->_lo >= 0 && |
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1971 // Are there other uses besides address expressions? |
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1972 !is_visited(conv) ) { |
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1973 address_visited.set(conv->_idx); // Flag as address_visited |
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1974 mstack.push(conv->in(1), Pre_Visit); |
| 0 | 1975 } else |
| 1976 #endif | |
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1977 mstack.push(conv, Pre_Visit); |
| 0 | 1978 } else { |
| 1979 mstack.push(shift, Pre_Visit); | |
| 1980 } | |
| 1981 mstack.push(adr->in(AddPNode::Address), Pre_Visit); | |
| 1982 mstack.push(adr->in(AddPNode::Base), Pre_Visit); | |
| 1983 } else { // Sparc, Alpha, PPC and friends | |
| 1984 mstack.push(adr, Pre_Visit); | |
| 1985 } | |
| 1986 | |
| 1987 // Clone X+offset as it also folds into most addressing expressions | |
| 1988 mstack.push(off, Visit); | |
| 1989 mstack.push(m->in(AddPNode::Base), Pre_Visit); | |
| 1990 continue; // for(int i = ...) | |
| 1991 } // if( off->is_Con() ) | |
| 1992 } // if( mem_op && | |
| 1993 mstack.push(m, Pre_Visit); | |
| 1994 } // for(int i = ...) | |
| 1995 } | |
| 1996 else if (nstate == Alt_Post_Visit) { | |
| 1997 mstack.pop(); // Remove node from stack | |
| 1998 // We cannot remove the Cmp input from the Bool here, as the Bool may be | |
| 1999 // shared and all users of the Bool need to move the Cmp in parallel. | |
| 2000 // This leaves both the Bool and the If pointing at the Cmp. To | |
| 2001 // prevent the Matcher from trying to Match the Cmp along both paths | |
| 2002 // BoolNode::match_edge always returns a zero. | |
| 2003 | |
| 2004 // We reorder the Op_If in a pre-order manner, so we can visit without | |
| 605 | 2005 // accidentally sharing the Cmp (the Bool and the If make 2 users). |
| 0 | 2006 n->add_req( n->in(1)->in(1) ); // Add the Cmp next to the Bool |
| 2007 } | |
| 2008 else if (nstate == Post_Visit) { | |
| 2009 mstack.pop(); // Remove node from stack | |
| 2010 | |
| 2011 // Now hack a few special opcodes | |
| 2012 switch( n->Opcode() ) { // Handle some opcodes special | |
| 2013 case Op_StorePConditional: | |
|
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2014 case Op_StoreIConditional: |
| 0 | 2015 case Op_StoreLConditional: |
| 2016 case Op_CompareAndSwapI: | |
| 2017 case Op_CompareAndSwapL: | |
|
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2018 case Op_CompareAndSwapP: |
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2019 case Op_CompareAndSwapN: { // Convert trinary to binary-tree |
| 0 | 2020 Node *newval = n->in(MemNode::ValueIn ); |
| 2021 Node *oldval = n->in(LoadStoreNode::ExpectedIn); | |
| 2022 Node *pair = new (C, 3) BinaryNode( oldval, newval ); | |
| 2023 n->set_req(MemNode::ValueIn,pair); | |
| 2024 n->del_req(LoadStoreNode::ExpectedIn); | |
| 2025 break; | |
| 2026 } | |
| 2027 case Op_CMoveD: // Convert trinary to binary-tree | |
| 2028 case Op_CMoveF: | |
| 2029 case Op_CMoveI: | |
| 2030 case Op_CMoveL: | |
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2031 case Op_CMoveN: |
| 0 | 2032 case Op_CMoveP: { |
| 2033 // Restructure into a binary tree for Matching. It's possible that | |
| 2034 // we could move this code up next to the graph reshaping for IfNodes | |
| 2035 // or vice-versa, but I do not want to debug this for Ladybird. | |
| 2036 // 10/2/2000 CNC. | |
| 2037 Node *pair1 = new (C, 3) BinaryNode(n->in(1),n->in(1)->in(1)); | |
| 2038 n->set_req(1,pair1); | |
| 2039 Node *pair2 = new (C, 3) BinaryNode(n->in(2),n->in(3)); | |
| 2040 n->set_req(2,pair2); | |
| 2041 n->del_req(3); | |
| 2042 break; | |
| 2043 } | |
|
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2044 case Op_StrEquals: { |
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2045 Node *pair1 = new (C, 3) BinaryNode(n->in(2),n->in(3)); |
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2046 n->set_req(2,pair1); |
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2047 n->set_req(3,n->in(4)); |
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2048 n->del_req(4); |
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2049 break; |
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2050 } |
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2051 case Op_StrComp: |
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2052 case Op_StrIndexOf: { |
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2053 Node *pair1 = new (C, 3) BinaryNode(n->in(2),n->in(3)); |
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2054 n->set_req(2,pair1); |
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2055 Node *pair2 = new (C, 3) BinaryNode(n->in(4),n->in(5)); |
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2056 n->set_req(3,pair2); |
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2057 n->del_req(5); |
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2058 n->del_req(4); |
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2059 break; |
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2060 } |
| 0 | 2061 default: |
| 2062 break; | |
| 2063 } | |
| 2064 } | |
| 2065 else { | |
| 2066 ShouldNotReachHere(); | |
| 2067 } | |
| 2068 } // end of while (mstack.is_nonempty()) | |
| 2069 } | |
| 2070 | |
| 2071 #ifdef ASSERT | |
| 2072 // machine-independent root to machine-dependent root | |
| 2073 void Matcher::dump_old2new_map() { | |
| 2074 _old2new_map.dump(); | |
| 2075 } | |
| 2076 #endif | |
| 2077 | |
| 2078 //---------------------------collect_null_checks------------------------------- | |
| 2079 // Find null checks in the ideal graph; write a machine-specific node for | |
| 2080 // it. Used by later implicit-null-check handling. Actually collects | |
| 2081 // either an IfTrue or IfFalse for the common NOT-null path, AND the ideal | |
| 2082 // value being tested. | |
|
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2083 void Matcher::collect_null_checks( Node *proj, Node *orig_proj ) { |
| 0 | 2084 Node *iff = proj->in(0); |
| 2085 if( iff->Opcode() == Op_If ) { | |
| 2086 // During matching If's have Bool & Cmp side-by-side | |
| 2087 BoolNode *b = iff->in(1)->as_Bool(); | |
| 2088 Node *cmp = iff->in(2); | |
|
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2089 int opc = cmp->Opcode(); |
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2090 if (opc != Op_CmpP && opc != Op_CmpN) return; |
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2091 |
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2092 const Type* ct = cmp->in(2)->bottom_type(); |
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2093 if (ct == TypePtr::NULL_PTR || |
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2094 (opc == Op_CmpN && ct == TypeNarrowOop::NULL_PTR)) { |
| 0 | 2095 |
|
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2096 bool push_it = false; |
|
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2097 if( proj->Opcode() == Op_IfTrue ) { |
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2098 extern int all_null_checks_found; |
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2099 all_null_checks_found++; |
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2100 if( b->_test._test == BoolTest::ne ) { |
|
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2101 push_it = true; |
|
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2102 } |
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2103 } else { |
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2104 assert( proj->Opcode() == Op_IfFalse, "" ); |
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2105 if( b->_test._test == BoolTest::eq ) { |
|
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2106 push_it = true; |
| 0 | 2107 } |
| 2108 } | |
|
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2109 if( push_it ) { |
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2110 _null_check_tests.push(proj); |
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2111 Node* val = cmp->in(1); |
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2112 #ifdef _LP64 |
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2113 if (UseCompressedOops && !Matcher::clone_shift_expressions && |
|
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2114 val->bottom_type()->isa_narrowoop()) { |
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2115 // |
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2116 // Look for DecodeN node which should be pinned to orig_proj. |
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2117 // On platforms (Sparc) which can not handle 2 adds |
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2118 // in addressing mode we have to keep a DecodeN node and |
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2119 // use it to do implicit NULL check in address. |
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2120 // |
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2121 // DecodeN node was pinned to non-null path (orig_proj) during |
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2122 // CastPP transformation in final_graph_reshaping_impl(). |
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2123 // |
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2124 uint cnt = orig_proj->outcnt(); |
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2125 for (uint i = 0; i < orig_proj->outcnt(); i++) { |
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2126 Node* d = orig_proj->raw_out(i); |
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2127 if (d->is_DecodeN() && d->in(1) == val) { |
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2128 val = d; |
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2129 val->set_req(0, NULL); // Unpin now. |
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2130 break; |
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2131 } |
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2132 } |
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2133 } |
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2134 #endif |
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2135 _null_check_tests.push(val); |
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2136 } |
| 0 | 2137 } |
| 2138 } | |
| 2139 } | |
| 2140 | |
| 2141 //---------------------------validate_null_checks------------------------------ | |
| 2142 // Its possible that the value being NULL checked is not the root of a match | |
| 2143 // tree. If so, I cannot use the value in an implicit null check. | |
| 2144 void Matcher::validate_null_checks( ) { | |
| 2145 uint cnt = _null_check_tests.size(); | |
| 2146 for( uint i=0; i < cnt; i+=2 ) { | |
| 2147 Node *test = _null_check_tests[i]; | |
| 2148 Node *val = _null_check_tests[i+1]; | |
| 2149 if (has_new_node(val)) { | |
| 2150 // Is a match-tree root, so replace with the matched value | |
| 2151 _null_check_tests.map(i+1, new_node(val)); | |
| 2152 } else { | |
| 2153 // Yank from candidate list | |
| 2154 _null_check_tests.map(i+1,_null_check_tests[--cnt]); | |
| 2155 _null_check_tests.map(i,_null_check_tests[--cnt]); | |
| 2156 _null_check_tests.pop(); | |
| 2157 _null_check_tests.pop(); | |
| 2158 i-=2; | |
| 2159 } | |
| 2160 } | |
| 2161 } | |
| 2162 | |
| 2163 | |
| 2164 // Used by the DFA in dfa_sparc.cpp. Check for a prior FastLock | |
| 2165 // acting as an Acquire and thus we don't need an Acquire here. We | |
| 2166 // retain the Node to act as a compiler ordering barrier. | |
| 2167 bool Matcher::prior_fast_lock( const Node *acq ) { | |
| 2168 Node *r = acq->in(0); | |
| 2169 if( !r->is_Region() || r->req() <= 1 ) return false; | |
| 2170 Node *proj = r->in(1); | |
| 2171 if( !proj->is_Proj() ) return false; | |
| 2172 Node *call = proj->in(0); | |
| 2173 if( !call->is_Call() || call->as_Call()->entry_point() != OptoRuntime::complete_monitor_locking_Java() ) | |
| 2174 return false; | |
| 2175 | |
| 2176 return true; | |
| 2177 } | |
| 2178 | |
| 2179 // Used by the DFA in dfa_sparc.cpp. Check for a following FastUnLock | |
| 2180 // acting as a Release and thus we don't need a Release here. We | |
| 2181 // retain the Node to act as a compiler ordering barrier. | |
| 2182 bool Matcher::post_fast_unlock( const Node *rel ) { | |
| 2183 Compile *C = Compile::current(); | |
| 2184 assert( rel->Opcode() == Op_MemBarRelease, "" ); | |
| 2185 const MemBarReleaseNode *mem = (const MemBarReleaseNode*)rel; | |
| 2186 DUIterator_Fast imax, i = mem->fast_outs(imax); | |
| 2187 Node *ctrl = NULL; | |
| 2188 while( true ) { | |
| 2189 ctrl = mem->fast_out(i); // Throw out-of-bounds if proj not found | |
| 2190 assert( ctrl->is_Proj(), "only projections here" ); | |
| 2191 ProjNode *proj = (ProjNode*)ctrl; | |
| 2192 if( proj->_con == TypeFunc::Control && | |
| 2193 !C->node_arena()->contains(ctrl) ) // Unmatched old-space only | |
| 2194 break; | |
| 2195 i++; | |
| 2196 } | |
| 2197 Node *iff = NULL; | |
| 2198 for( DUIterator_Fast jmax, j = ctrl->fast_outs(jmax); j < jmax; j++ ) { | |
| 2199 Node *x = ctrl->fast_out(j); | |
| 2200 if( x->is_If() && x->req() > 1 && | |
| 2201 !C->node_arena()->contains(x) ) { // Unmatched old-space only | |
| 2202 iff = x; | |
| 2203 break; | |
| 2204 } | |
| 2205 } | |
| 2206 if( !iff ) return false; | |
| 2207 Node *bol = iff->in(1); | |
| 2208 // The iff might be some random subclass of If or bol might be Con-Top | |
| 2209 if (!bol->is_Bool()) return false; | |
| 2210 assert( bol->req() > 1, "" ); | |
| 2211 return (bol->in(1)->Opcode() == Op_FastUnlock); | |
| 2212 } | |
| 2213 | |
| 2214 // Used by the DFA in dfa_xxx.cpp. Check for a following barrier or | |
| 2215 // atomic instruction acting as a store_load barrier without any | |
| 2216 // intervening volatile load, and thus we don't need a barrier here. | |
| 2217 // We retain the Node to act as a compiler ordering barrier. | |
| 2218 bool Matcher::post_store_load_barrier(const Node *vmb) { | |
| 2219 Compile *C = Compile::current(); | |
| 2220 assert( vmb->is_MemBar(), "" ); | |
| 2221 assert( vmb->Opcode() != Op_MemBarAcquire, "" ); | |
| 2222 const MemBarNode *mem = (const MemBarNode*)vmb; | |
| 2223 | |
| 2224 // Get the Proj node, ctrl, that can be used to iterate forward | |
| 2225 Node *ctrl = NULL; | |
| 2226 DUIterator_Fast imax, i = mem->fast_outs(imax); | |
| 2227 while( true ) { | |
| 2228 ctrl = mem->fast_out(i); // Throw out-of-bounds if proj not found | |
| 2229 assert( ctrl->is_Proj(), "only projections here" ); | |
| 2230 ProjNode *proj = (ProjNode*)ctrl; | |
| 2231 if( proj->_con == TypeFunc::Control && | |
| 2232 !C->node_arena()->contains(ctrl) ) // Unmatched old-space only | |
| 2233 break; | |
| 2234 i++; | |
| 2235 } | |
| 2236 | |
| 2237 for( DUIterator_Fast jmax, j = ctrl->fast_outs(jmax); j < jmax; j++ ) { | |
| 2238 Node *x = ctrl->fast_out(j); | |
| 2239 int xop = x->Opcode(); | |
| 2240 | |
| 2241 // We don't need current barrier if we see another or a lock | |
| 2242 // before seeing volatile load. | |
| 2243 // | |
| 2244 // Op_Fastunlock previously appeared in the Op_* list below. | |
| 2245 // With the advent of 1-0 lock operations we're no longer guaranteed | |
| 2246 // that a monitor exit operation contains a serializing instruction. | |
| 2247 | |
| 2248 if (xop == Op_MemBarVolatile || | |
| 2249 xop == Op_FastLock || | |
| 2250 xop == Op_CompareAndSwapL || | |
| 2251 xop == Op_CompareAndSwapP || | |
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2252 xop == Op_CompareAndSwapN || |
| 0 | 2253 xop == Op_CompareAndSwapI) |
| 2254 return true; | |
| 2255 | |
| 2256 if (x->is_MemBar()) { | |
| 2257 // We must retain this membar if there is an upcoming volatile | |
| 2258 // load, which will be preceded by acquire membar. | |
| 2259 if (xop == Op_MemBarAcquire) | |
| 2260 return false; | |
| 2261 // For other kinds of barriers, check by pretending we | |
| 2262 // are them, and seeing if we can be removed. | |
| 2263 else | |
| 2264 return post_store_load_barrier((const MemBarNode*)x); | |
| 2265 } | |
| 2266 | |
| 2267 // Delicate code to detect case of an upcoming fastlock block | |
| 2268 if( x->is_If() && x->req() > 1 && | |
| 2269 !C->node_arena()->contains(x) ) { // Unmatched old-space only | |
| 2270 Node *iff = x; | |
| 2271 Node *bol = iff->in(1); | |
| 2272 // The iff might be some random subclass of If or bol might be Con-Top | |
| 2273 if (!bol->is_Bool()) return false; | |
| 2274 assert( bol->req() > 1, "" ); | |
| 2275 return (bol->in(1)->Opcode() == Op_FastUnlock); | |
| 2276 } | |
| 2277 // probably not necessary to check for these | |
| 2278 if (x->is_Call() || x->is_SafePoint() || x->is_block_proj()) | |
| 2279 return false; | |
| 2280 } | |
| 2281 return false; | |
| 2282 } | |
| 2283 | |
| 2284 //============================================================================= | |
| 2285 //---------------------------State--------------------------------------------- | |
| 2286 State::State(void) { | |
| 2287 #ifdef ASSERT | |
| 2288 _id = 0; | |
| 2289 _kids[0] = _kids[1] = (State*)(intptr_t) CONST64(0xcafebabecafebabe); | |
| 2290 _leaf = (Node*)(intptr_t) CONST64(0xbaadf00dbaadf00d); | |
| 2291 //memset(_cost, -1, sizeof(_cost)); | |
| 2292 //memset(_rule, -1, sizeof(_rule)); | |
| 2293 #endif | |
| 2294 memset(_valid, 0, sizeof(_valid)); | |
| 2295 } | |
| 2296 | |
| 2297 #ifdef ASSERT | |
| 2298 State::~State() { | |
| 2299 _id = 99; | |
| 2300 _kids[0] = _kids[1] = (State*)(intptr_t) CONST64(0xcafebabecafebabe); | |
| 2301 _leaf = (Node*)(intptr_t) CONST64(0xbaadf00dbaadf00d); | |
| 2302 memset(_cost, -3, sizeof(_cost)); | |
| 2303 memset(_rule, -3, sizeof(_rule)); | |
| 2304 } | |
| 2305 #endif | |
| 2306 | |
| 2307 #ifndef PRODUCT | |
| 2308 //---------------------------dump---------------------------------------------- | |
| 2309 void State::dump() { | |
| 2310 tty->print("\n"); | |
| 2311 dump(0); | |
| 2312 } | |
| 2313 | |
| 2314 void State::dump(int depth) { | |
| 2315 for( int j = 0; j < depth; j++ ) | |
| 2316 tty->print(" "); | |
| 2317 tty->print("--N: "); | |
| 2318 _leaf->dump(); | |
| 2319 uint i; | |
| 2320 for( i = 0; i < _LAST_MACH_OPER; i++ ) | |
| 2321 // Check for valid entry | |
| 2322 if( valid(i) ) { | |
| 2323 for( int j = 0; j < depth; j++ ) | |
| 2324 tty->print(" "); | |
| 2325 assert(_cost[i] != max_juint, "cost must be a valid value"); | |
| 2326 assert(_rule[i] < _last_Mach_Node, "rule[i] must be valid rule"); | |
| 2327 tty->print_cr("%s %d %s", | |
| 2328 ruleName[i], _cost[i], ruleName[_rule[i]] ); | |
| 2329 } | |
| 2330 tty->print_cr(""); | |
| 2331 | |
| 2332 for( i=0; i<2; i++ ) | |
| 2333 if( _kids[i] ) | |
| 2334 _kids[i]->dump(depth+1); | |
| 2335 } | |
| 2336 #endif |