Mercurial > hg > truffle
annotate src/share/vm/opto/lcm.cpp @ 2401:7e88bdae86ec
7029017: Additional architecture support for c2 compiler
Summary: Enables cross building of a c2 VM. Support masking of shift counts when the processor architecture mandates it.
Reviewed-by: kvn, never
| author | roland |
|---|---|
| date | Fri, 25 Mar 2011 09:35:39 +0100 |
| parents | f95d63e2154a |
| children | 1d1603768966 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1748 | 2 * Copyright (c) 1998, 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 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "memory/allocation.inline.hpp" | |
| 27 #include "opto/block.hpp" | |
| 28 #include "opto/c2compiler.hpp" | |
| 29 #include "opto/callnode.hpp" | |
| 30 #include "opto/cfgnode.hpp" | |
| 31 #include "opto/machnode.hpp" | |
| 32 #include "opto/runtime.hpp" | |
| 33 #ifdef TARGET_ARCH_MODEL_x86_32 | |
| 34 # include "adfiles/ad_x86_32.hpp" | |
| 35 #endif | |
| 36 #ifdef TARGET_ARCH_MODEL_x86_64 | |
| 37 # include "adfiles/ad_x86_64.hpp" | |
| 38 #endif | |
| 39 #ifdef TARGET_ARCH_MODEL_sparc | |
| 40 # include "adfiles/ad_sparc.hpp" | |
| 41 #endif | |
| 42 #ifdef TARGET_ARCH_MODEL_zero | |
| 43 # include "adfiles/ad_zero.hpp" | |
| 44 #endif | |
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45 #ifdef TARGET_ARCH_MODEL_arm |
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46 # include "adfiles/ad_arm.hpp" |
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47 #endif |
| 0 | 48 |
| 1972 | 49 // Optimization - Graph Style |
| 0 | 50 |
| 51 //------------------------------implicit_null_check---------------------------- | |
| 52 // Detect implicit-null-check opportunities. Basically, find NULL checks | |
| 53 // with suitable memory ops nearby. Use the memory op to do the NULL check. | |
| 54 // I can generate a memory op if there is not one nearby. | |
| 55 // The proj is the control projection for the not-null case. | |
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56 // The val is the pointer being checked for nullness or |
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57 // decodeHeapOop_not_null node if it did not fold into address. |
| 0 | 58 void Block::implicit_null_check(PhaseCFG *cfg, Node *proj, Node *val, int allowed_reasons) { |
| 59 // Assume if null check need for 0 offset then always needed | |
| 60 // Intel solaris doesn't support any null checks yet and no | |
| 61 // mechanism exists (yet) to set the switches at an os_cpu level | |
| 62 if( !ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(0)) return; | |
| 63 | |
| 64 // Make sure the ptr-is-null path appears to be uncommon! | |
| 65 float f = end()->as_MachIf()->_prob; | |
| 66 if( proj->Opcode() == Op_IfTrue ) f = 1.0f - f; | |
| 67 if( f > PROB_UNLIKELY_MAG(4) ) return; | |
| 68 | |
| 69 uint bidx = 0; // Capture index of value into memop | |
| 70 bool was_store; // Memory op is a store op | |
| 71 | |
| 72 // Get the successor block for if the test ptr is non-null | |
| 73 Block* not_null_block; // this one goes with the proj | |
| 74 Block* null_block; | |
| 75 if (_nodes[_nodes.size()-1] == proj) { | |
| 76 null_block = _succs[0]; | |
| 77 not_null_block = _succs[1]; | |
| 78 } else { | |
| 79 assert(_nodes[_nodes.size()-2] == proj, "proj is one or the other"); | |
| 80 not_null_block = _succs[0]; | |
| 81 null_block = _succs[1]; | |
| 82 } | |
| 332 | 83 while (null_block->is_Empty() == Block::empty_with_goto) { |
| 84 null_block = null_block->_succs[0]; | |
| 85 } | |
| 0 | 86 |
| 87 // Search the exception block for an uncommon trap. | |
| 88 // (See Parse::do_if and Parse::do_ifnull for the reason | |
| 89 // we need an uncommon trap. Briefly, we need a way to | |
| 90 // detect failure of this optimization, as in 6366351.) | |
| 91 { | |
| 92 bool found_trap = false; | |
| 93 for (uint i1 = 0; i1 < null_block->_nodes.size(); i1++) { | |
| 94 Node* nn = null_block->_nodes[i1]; | |
| 95 if (nn->is_MachCall() && | |
| 1748 | 96 nn->as_MachCall()->entry_point() == SharedRuntime::uncommon_trap_blob()->entry_point()) { |
| 0 | 97 const Type* trtype = nn->in(TypeFunc::Parms)->bottom_type(); |
| 98 if (trtype->isa_int() && trtype->is_int()->is_con()) { | |
| 99 jint tr_con = trtype->is_int()->get_con(); | |
| 100 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(tr_con); | |
| 101 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(tr_con); | |
| 102 assert((int)reason < (int)BitsPerInt, "recode bit map"); | |
| 103 if (is_set_nth_bit(allowed_reasons, (int) reason) | |
| 104 && action != Deoptimization::Action_none) { | |
| 105 // This uncommon trap is sure to recompile, eventually. | |
| 106 // When that happens, C->too_many_traps will prevent | |
| 107 // this transformation from happening again. | |
| 108 found_trap = true; | |
| 109 } | |
| 110 } | |
| 111 break; | |
| 112 } | |
| 113 } | |
| 114 if (!found_trap) { | |
| 115 // We did not find an uncommon trap. | |
| 116 return; | |
| 117 } | |
| 118 } | |
| 119 | |
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120 // Check for decodeHeapOop_not_null node which did not fold into address |
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121 bool is_decoden = ((intptr_t)val) & 1; |
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122 val = (Node*)(((intptr_t)val) & ~1); |
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123 |
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124 assert(!is_decoden || (val->in(0) == NULL) && val->is_Mach() && |
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125 (val->as_Mach()->ideal_Opcode() == Op_DecodeN), "sanity"); |
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126 |
| 0 | 127 // Search the successor block for a load or store who's base value is also |
| 128 // the tested value. There may be several. | |
| 129 Node_List *out = new Node_List(Thread::current()->resource_area()); | |
| 130 MachNode *best = NULL; // Best found so far | |
| 131 for (DUIterator i = val->outs(); val->has_out(i); i++) { | |
| 132 Node *m = val->out(i); | |
| 133 if( !m->is_Mach() ) continue; | |
| 134 MachNode *mach = m->as_Mach(); | |
| 135 was_store = false; | |
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136 int iop = mach->ideal_Opcode(); |
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137 switch( iop ) { |
| 0 | 138 case Op_LoadB: |
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139 case Op_LoadUS: |
| 0 | 140 case Op_LoadD: |
| 141 case Op_LoadF: | |
| 142 case Op_LoadI: | |
| 143 case Op_LoadL: | |
| 144 case Op_LoadP: | |
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145 case Op_LoadN: |
| 0 | 146 case Op_LoadS: |
| 147 case Op_LoadKlass: | |
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148 case Op_LoadNKlass: |
| 0 | 149 case Op_LoadRange: |
| 150 case Op_LoadD_unaligned: | |
| 151 case Op_LoadL_unaligned: | |
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152 assert(mach->in(2) == val, "should be address"); |
| 0 | 153 break; |
| 154 case Op_StoreB: | |
| 155 case Op_StoreC: | |
| 156 case Op_StoreCM: | |
| 157 case Op_StoreD: | |
| 158 case Op_StoreF: | |
| 159 case Op_StoreI: | |
| 160 case Op_StoreL: | |
| 161 case Op_StoreP: | |
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162 case Op_StoreN: |
| 0 | 163 was_store = true; // Memory op is a store op |
| 164 // Stores will have their address in slot 2 (memory in slot 1). | |
| 165 // If the value being nul-checked is in another slot, it means we | |
| 166 // are storing the checked value, which does NOT check the value! | |
| 167 if( mach->in(2) != val ) continue; | |
| 168 break; // Found a memory op? | |
| 169 case Op_StrComp: | |
| 681 | 170 case Op_StrEquals: |
| 171 case Op_StrIndexOf: | |
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172 case Op_AryEq: |
| 0 | 173 // Not a legit memory op for implicit null check regardless of |
| 174 // embedded loads | |
| 175 continue; | |
| 176 default: // Also check for embedded loads | |
| 177 if( !mach->needs_anti_dependence_check() ) | |
| 178 continue; // Not an memory op; skip it | |
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179 if( must_clone[iop] ) { |
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180 // Do not move nodes which produce flags because |
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181 // RA will try to clone it to place near branch and |
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182 // it will cause recompilation, see clone_node(). |
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183 continue; |
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184 } |
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185 { |
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186 // Check that value is used in memory address in |
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187 // instructions with embedded load (CmpP val1,(val2+off)). |
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188 Node* base; |
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189 Node* index; |
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190 const MachOper* oper = mach->memory_inputs(base, index); |
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191 if (oper == NULL || oper == (MachOper*)-1) { |
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192 continue; // Not an memory op; skip it |
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193 } |
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194 if (val == base || |
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195 val == index && val->bottom_type()->isa_narrowoop()) { |
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196 break; // Found it |
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197 } else { |
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198 continue; // Skip it |
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199 } |
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200 } |
| 0 | 201 break; |
| 202 } | |
| 203 // check if the offset is not too high for implicit exception | |
| 204 { | |
| 205 intptr_t offset = 0; | |
| 206 const TypePtr *adr_type = NULL; // Do not need this return value here | |
| 207 const Node* base = mach->get_base_and_disp(offset, adr_type); | |
| 208 if (base == NULL || base == NodeSentinel) { | |
| 332 | 209 // Narrow oop address doesn't have base, only index |
| 210 if( val->bottom_type()->isa_narrowoop() && | |
| 211 MacroAssembler::needs_explicit_null_check(offset) ) | |
| 212 continue; // Give up if offset is beyond page size | |
| 0 | 213 // cannot reason about it; is probably not implicit null exception |
| 214 } else { | |
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215 const TypePtr* tptr; |
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216 if (UseCompressedOops && Universe::narrow_oop_shift() == 0) { |
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217 // 32-bits narrow oop can be the base of address expressions |
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218 tptr = base->bottom_type()->make_ptr(); |
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219 } else { |
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220 // only regular oops are expected here |
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221 tptr = base->bottom_type()->is_ptr(); |
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222 } |
| 0 | 223 // Give up if offset is not a compile-time constant |
| 224 if( offset == Type::OffsetBot || tptr->_offset == Type::OffsetBot ) | |
| 225 continue; | |
| 226 offset += tptr->_offset; // correct if base is offseted | |
| 227 if( MacroAssembler::needs_explicit_null_check(offset) ) | |
| 228 continue; // Give up is reference is beyond 4K page size | |
| 229 } | |
| 230 } | |
| 231 | |
| 232 // Check ctrl input to see if the null-check dominates the memory op | |
| 233 Block *cb = cfg->_bbs[mach->_idx]; | |
| 234 cb = cb->_idom; // Always hoist at least 1 block | |
| 235 if( !was_store ) { // Stores can be hoisted only one block | |
| 236 while( cb->_dom_depth > (_dom_depth + 1)) | |
| 237 cb = cb->_idom; // Hoist loads as far as we want | |
| 238 // The non-null-block should dominate the memory op, too. Live | |
| 239 // range spilling will insert a spill in the non-null-block if it is | |
| 240 // needs to spill the memory op for an implicit null check. | |
| 241 if (cb->_dom_depth == (_dom_depth + 1)) { | |
| 242 if (cb != not_null_block) continue; | |
| 243 cb = cb->_idom; | |
| 244 } | |
| 245 } | |
| 246 if( cb != this ) continue; | |
| 247 | |
| 248 // Found a memory user; see if it can be hoisted to check-block | |
| 249 uint vidx = 0; // Capture index of value into memop | |
| 250 uint j; | |
| 251 for( j = mach->req()-1; j > 0; j-- ) { | |
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252 if( mach->in(j) == val ) { |
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253 vidx = j; |
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254 // Ignore DecodeN val which could be hoisted to where needed. |
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255 if( is_decoden ) continue; |
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256 } |
| 0 | 257 // Block of memory-op input |
| 258 Block *inb = cfg->_bbs[mach->in(j)->_idx]; | |
| 259 Block *b = this; // Start from nul check | |
| 260 while( b != inb && b->_dom_depth > inb->_dom_depth ) | |
| 261 b = b->_idom; // search upwards for input | |
| 262 // See if input dominates null check | |
| 263 if( b != inb ) | |
| 264 break; | |
| 265 } | |
| 266 if( j > 0 ) | |
| 267 continue; | |
| 268 Block *mb = cfg->_bbs[mach->_idx]; | |
| 269 // Hoisting stores requires more checks for the anti-dependence case. | |
| 270 // Give up hoisting if we have to move the store past any load. | |
| 271 if( was_store ) { | |
| 272 Block *b = mb; // Start searching here for a local load | |
| 273 // mach use (faulting) trying to hoist | |
| 274 // n might be blocker to hoisting | |
| 275 while( b != this ) { | |
| 276 uint k; | |
| 277 for( k = 1; k < b->_nodes.size(); k++ ) { | |
| 278 Node *n = b->_nodes[k]; | |
| 279 if( n->needs_anti_dependence_check() && | |
| 280 n->in(LoadNode::Memory) == mach->in(StoreNode::Memory) ) | |
| 281 break; // Found anti-dependent load | |
| 282 } | |
| 283 if( k < b->_nodes.size() ) | |
| 284 break; // Found anti-dependent load | |
| 285 // Make sure control does not do a merge (would have to check allpaths) | |
| 286 if( b->num_preds() != 2 ) break; | |
| 287 b = cfg->_bbs[b->pred(1)->_idx]; // Move up to predecessor block | |
| 288 } | |
| 289 if( b != this ) continue; | |
| 290 } | |
| 291 | |
| 292 // Make sure this memory op is not already being used for a NullCheck | |
| 293 Node *e = mb->end(); | |
| 294 if( e->is_MachNullCheck() && e->in(1) == mach ) | |
| 295 continue; // Already being used as a NULL check | |
| 296 | |
| 297 // Found a candidate! Pick one with least dom depth - the highest | |
| 298 // in the dom tree should be closest to the null check. | |
| 299 if( !best || | |
| 300 cfg->_bbs[mach->_idx]->_dom_depth < cfg->_bbs[best->_idx]->_dom_depth ) { | |
| 301 best = mach; | |
| 302 bidx = vidx; | |
| 303 | |
| 304 } | |
| 305 } | |
| 306 // No candidate! | |
| 307 if( !best ) return; | |
| 308 | |
| 309 // ---- Found an implicit null check | |
| 310 extern int implicit_null_checks; | |
| 311 implicit_null_checks++; | |
| 312 | |
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313 if( is_decoden ) { |
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314 // Check if we need to hoist decodeHeapOop_not_null first. |
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315 Block *valb = cfg->_bbs[val->_idx]; |
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316 if( this != valb && this->_dom_depth < valb->_dom_depth ) { |
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317 // Hoist it up to the end of the test block. |
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318 valb->find_remove(val); |
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319 this->add_inst(val); |
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320 cfg->_bbs.map(val->_idx,this); |
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321 // DecodeN on x86 may kill flags. Check for flag-killing projections |
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322 // that also need to be hoisted. |
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323 for (DUIterator_Fast jmax, j = val->fast_outs(jmax); j < jmax; j++) { |
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324 Node* n = val->fast_out(j); |
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325 if( n->Opcode() == Op_MachProj ) { |
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326 cfg->_bbs[n->_idx]->find_remove(n); |
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327 this->add_inst(n); |
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328 cfg->_bbs.map(n->_idx,this); |
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329 } |
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330 } |
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331 } |
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332 } |
| 0 | 333 // Hoist the memory candidate up to the end of the test block. |
| 334 Block *old_block = cfg->_bbs[best->_idx]; | |
| 335 old_block->find_remove(best); | |
| 336 add_inst(best); | |
| 337 cfg->_bbs.map(best->_idx,this); | |
| 338 | |
| 339 // Move the control dependence | |
| 340 if (best->in(0) && best->in(0) == old_block->_nodes[0]) | |
| 341 best->set_req(0, _nodes[0]); | |
| 342 | |
| 343 // Check for flag-killing projections that also need to be hoisted | |
| 344 // Should be DU safe because no edge updates. | |
| 345 for (DUIterator_Fast jmax, j = best->fast_outs(jmax); j < jmax; j++) { | |
| 346 Node* n = best->fast_out(j); | |
| 347 if( n->Opcode() == Op_MachProj ) { | |
| 348 cfg->_bbs[n->_idx]->find_remove(n); | |
| 349 add_inst(n); | |
| 350 cfg->_bbs.map(n->_idx,this); | |
| 351 } | |
| 352 } | |
| 353 | |
| 354 Compile *C = cfg->C; | |
| 355 // proj==Op_True --> ne test; proj==Op_False --> eq test. | |
| 356 // One of two graph shapes got matched: | |
| 357 // (IfTrue (If (Bool NE (CmpP ptr NULL)))) | |
| 358 // (IfFalse (If (Bool EQ (CmpP ptr NULL)))) | |
| 359 // NULL checks are always branch-if-eq. If we see a IfTrue projection | |
| 360 // then we are replacing a 'ne' test with a 'eq' NULL check test. | |
| 361 // We need to flip the projections to keep the same semantics. | |
| 362 if( proj->Opcode() == Op_IfTrue ) { | |
| 363 // Swap order of projections in basic block to swap branch targets | |
| 364 Node *tmp1 = _nodes[end_idx()+1]; | |
| 365 Node *tmp2 = _nodes[end_idx()+2]; | |
| 366 _nodes.map(end_idx()+1, tmp2); | |
| 367 _nodes.map(end_idx()+2, tmp1); | |
| 368 Node *tmp = new (C, 1) Node(C->top()); // Use not NULL input | |
| 369 tmp1->replace_by(tmp); | |
| 370 tmp2->replace_by(tmp1); | |
| 371 tmp->replace_by(tmp2); | |
| 372 tmp->destruct(); | |
| 373 } | |
| 374 | |
| 375 // Remove the existing null check; use a new implicit null check instead. | |
| 376 // Since schedule-local needs precise def-use info, we need to correct | |
| 377 // it as well. | |
| 378 Node *old_tst = proj->in(0); | |
| 379 MachNode *nul_chk = new (C) MachNullCheckNode(old_tst->in(0),best,bidx); | |
| 380 _nodes.map(end_idx(),nul_chk); | |
| 381 cfg->_bbs.map(nul_chk->_idx,this); | |
| 382 // Redirect users of old_test to nul_chk | |
| 383 for (DUIterator_Last i2min, i2 = old_tst->last_outs(i2min); i2 >= i2min; --i2) | |
| 384 old_tst->last_out(i2)->set_req(0, nul_chk); | |
| 385 // Clean-up any dead code | |
| 386 for (uint i3 = 0; i3 < old_tst->req(); i3++) | |
| 387 old_tst->set_req(i3, NULL); | |
| 388 | |
| 389 cfg->latency_from_uses(nul_chk); | |
| 390 cfg->latency_from_uses(best); | |
| 391 } | |
| 392 | |
| 393 | |
| 394 //------------------------------select----------------------------------------- | |
| 395 // Select a nice fellow from the worklist to schedule next. If there is only | |
| 396 // one choice, then use it. Projections take top priority for correctness | |
| 397 // reasons - if I see a projection, then it is next. There are a number of | |
| 398 // other special cases, for instructions that consume condition codes, et al. | |
| 399 // These are chosen immediately. Some instructions are required to immediately | |
| 400 // precede the last instruction in the block, and these are taken last. Of the | |
| 401 // remaining cases (most), choose the instruction with the greatest latency | |
| 402 // (that is, the most number of pseudo-cycles required to the end of the | |
| 403 // routine). If there is a tie, choose the instruction with the most inputs. | |
| 404 Node *Block::select(PhaseCFG *cfg, Node_List &worklist, int *ready_cnt, VectorSet &next_call, uint sched_slot) { | |
| 405 | |
| 406 // If only a single entry on the stack, use it | |
| 407 uint cnt = worklist.size(); | |
| 408 if (cnt == 1) { | |
| 409 Node *n = worklist[0]; | |
| 410 worklist.map(0,worklist.pop()); | |
| 411 return n; | |
| 412 } | |
| 413 | |
| 414 uint choice = 0; // Bigger is most important | |
| 415 uint latency = 0; // Bigger is scheduled first | |
| 416 uint score = 0; // Bigger is better | |
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417 int idx = -1; // Index in worklist |
| 0 | 418 |
| 419 for( uint i=0; i<cnt; i++ ) { // Inspect entire worklist | |
| 420 // Order in worklist is used to break ties. | |
| 421 // See caller for how this is used to delay scheduling | |
| 422 // of induction variable increments to after the other | |
| 423 // uses of the phi are scheduled. | |
| 424 Node *n = worklist[i]; // Get Node on worklist | |
| 425 | |
| 426 int iop = n->is_Mach() ? n->as_Mach()->ideal_Opcode() : 0; | |
| 427 if( n->is_Proj() || // Projections always win | |
| 428 n->Opcode()== Op_Con || // So does constant 'Top' | |
| 429 iop == Op_CreateEx || // Create-exception must start block | |
| 430 iop == Op_CheckCastPP | |
| 431 ) { | |
| 432 worklist.map(i,worklist.pop()); | |
| 433 return n; | |
| 434 } | |
| 435 | |
| 436 // Final call in a block must be adjacent to 'catch' | |
| 437 Node *e = end(); | |
| 438 if( e->is_Catch() && e->in(0)->in(0) == n ) | |
| 439 continue; | |
| 440 | |
| 441 // Memory op for an implicit null check has to be at the end of the block | |
| 442 if( e->is_MachNullCheck() && e->in(1) == n ) | |
| 443 continue; | |
| 444 | |
| 445 uint n_choice = 2; | |
| 446 | |
| 447 // See if this instruction is consumed by a branch. If so, then (as the | |
| 448 // branch is the last instruction in the basic block) force it to the | |
| 449 // end of the basic block | |
| 450 if ( must_clone[iop] ) { | |
| 451 // See if any use is a branch | |
| 452 bool found_machif = false; | |
| 453 | |
| 454 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
| 455 Node* use = n->fast_out(j); | |
| 456 | |
| 457 // The use is a conditional branch, make them adjacent | |
| 458 if (use->is_MachIf() && cfg->_bbs[use->_idx]==this ) { | |
| 459 found_machif = true; | |
| 460 break; | |
| 461 } | |
| 462 | |
| 463 // More than this instruction pending for successor to be ready, | |
| 464 // don't choose this if other opportunities are ready | |
| 465 if (ready_cnt[use->_idx] > 1) | |
| 466 n_choice = 1; | |
| 467 } | |
| 468 | |
| 469 // loop terminated, prefer not to use this instruction | |
| 470 if (found_machif) | |
| 471 continue; | |
| 472 } | |
| 473 | |
| 474 // See if this has a predecessor that is "must_clone", i.e. sets the | |
| 475 // condition code. If so, choose this first | |
| 476 for (uint j = 0; j < n->req() ; j++) { | |
| 477 Node *inn = n->in(j); | |
| 478 if (inn) { | |
| 479 if (inn->is_Mach() && must_clone[inn->as_Mach()->ideal_Opcode()] ) { | |
| 480 n_choice = 3; | |
| 481 break; | |
| 482 } | |
| 483 } | |
| 484 } | |
| 485 | |
| 486 // MachTemps should be scheduled last so they are near their uses | |
| 487 if (n->is_MachTemp()) { | |
| 488 n_choice = 1; | |
| 489 } | |
| 490 | |
| 1685 | 491 uint n_latency = cfg->_node_latency->at_grow(n->_idx); |
| 0 | 492 uint n_score = n->req(); // Many inputs get high score to break ties |
| 493 | |
| 494 // Keep best latency found | |
| 495 if( choice < n_choice || | |
| 496 ( choice == n_choice && | |
| 497 ( latency < n_latency || | |
| 498 ( latency == n_latency && | |
| 499 ( score < n_score ))))) { | |
| 500 choice = n_choice; | |
| 501 latency = n_latency; | |
| 502 score = n_score; | |
| 503 idx = i; // Also keep index in worklist | |
| 504 } | |
| 505 } // End of for all ready nodes in worklist | |
| 506 | |
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507 assert(idx >= 0, "index should be set"); |
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508 Node *n = worklist[(uint)idx]; // Get the winner |
| 0 | 509 |
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510 worklist.map((uint)idx, worklist.pop()); // Compress worklist |
| 0 | 511 return n; |
| 512 } | |
| 513 | |
| 514 | |
| 515 //------------------------------set_next_call---------------------------------- | |
| 516 void Block::set_next_call( Node *n, VectorSet &next_call, Block_Array &bbs ) { | |
| 517 if( next_call.test_set(n->_idx) ) return; | |
| 518 for( uint i=0; i<n->len(); i++ ) { | |
| 519 Node *m = n->in(i); | |
| 520 if( !m ) continue; // must see all nodes in block that precede call | |
| 521 if( bbs[m->_idx] == this ) | |
| 522 set_next_call( m, next_call, bbs ); | |
| 523 } | |
| 524 } | |
| 525 | |
| 526 //------------------------------needed_for_next_call--------------------------- | |
| 527 // Set the flag 'next_call' for each Node that is needed for the next call to | |
| 528 // be scheduled. This flag lets me bias scheduling so Nodes needed for the | |
| 529 // next subroutine call get priority - basically it moves things NOT needed | |
| 530 // for the next call till after the call. This prevents me from trying to | |
| 531 // carry lots of stuff live across a call. | |
| 532 void Block::needed_for_next_call(Node *this_call, VectorSet &next_call, Block_Array &bbs) { | |
| 533 // Find the next control-defining Node in this block | |
| 534 Node* call = NULL; | |
| 535 for (DUIterator_Fast imax, i = this_call->fast_outs(imax); i < imax; i++) { | |
| 536 Node* m = this_call->fast_out(i); | |
| 537 if( bbs[m->_idx] == this && // Local-block user | |
| 538 m != this_call && // Not self-start node | |
| 539 m->is_Call() ) | |
| 540 call = m; | |
| 541 break; | |
| 542 } | |
| 543 if (call == NULL) return; // No next call (e.g., block end is near) | |
| 544 // Set next-call for all inputs to this call | |
| 545 set_next_call(call, next_call, bbs); | |
| 546 } | |
| 547 | |
| 548 //------------------------------sched_call------------------------------------- | |
| 549 uint Block::sched_call( Matcher &matcher, Block_Array &bbs, uint node_cnt, Node_List &worklist, int *ready_cnt, MachCallNode *mcall, VectorSet &next_call ) { | |
| 550 RegMask regs; | |
| 551 | |
| 552 // Schedule all the users of the call right now. All the users are | |
| 553 // projection Nodes, so they must be scheduled next to the call. | |
| 554 // Collect all the defined registers. | |
| 555 for (DUIterator_Fast imax, i = mcall->fast_outs(imax); i < imax; i++) { | |
| 556 Node* n = mcall->fast_out(i); | |
| 557 assert( n->Opcode()==Op_MachProj, "" ); | |
| 558 --ready_cnt[n->_idx]; | |
| 559 assert( !ready_cnt[n->_idx], "" ); | |
| 560 // Schedule next to call | |
| 561 _nodes.map(node_cnt++, n); | |
| 562 // Collect defined registers | |
| 563 regs.OR(n->out_RegMask()); | |
| 564 // Check for scheduling the next control-definer | |
| 565 if( n->bottom_type() == Type::CONTROL ) | |
| 566 // Warm up next pile of heuristic bits | |
| 567 needed_for_next_call(n, next_call, bbs); | |
| 568 | |
| 569 // Children of projections are now all ready | |
| 570 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
| 571 Node* m = n->fast_out(j); // Get user | |
| 572 if( bbs[m->_idx] != this ) continue; | |
| 573 if( m->is_Phi() ) continue; | |
| 574 if( !--ready_cnt[m->_idx] ) | |
| 575 worklist.push(m); | |
| 576 } | |
| 577 | |
| 578 } | |
| 579 | |
| 580 // Act as if the call defines the Frame Pointer. | |
| 581 // Certainly the FP is alive and well after the call. | |
| 582 regs.Insert(matcher.c_frame_pointer()); | |
| 583 | |
| 584 // Set all registers killed and not already defined by the call. | |
| 585 uint r_cnt = mcall->tf()->range()->cnt(); | |
| 586 int op = mcall->ideal_Opcode(); | |
| 587 MachProjNode *proj = new (matcher.C, 1) MachProjNode( mcall, r_cnt+1, RegMask::Empty, MachProjNode::fat_proj ); | |
| 588 bbs.map(proj->_idx,this); | |
| 589 _nodes.insert(node_cnt++, proj); | |
| 590 | |
| 591 // Select the right register save policy. | |
| 592 const char * save_policy; | |
| 593 switch (op) { | |
| 594 case Op_CallRuntime: | |
| 595 case Op_CallLeaf: | |
| 596 case Op_CallLeafNoFP: | |
| 597 // Calling C code so use C calling convention | |
| 598 save_policy = matcher._c_reg_save_policy; | |
| 599 break; | |
| 600 | |
| 601 case Op_CallStaticJava: | |
| 602 case Op_CallDynamicJava: | |
| 603 // Calling Java code so use Java calling convention | |
| 604 save_policy = matcher._register_save_policy; | |
| 605 break; | |
| 606 | |
| 607 default: | |
| 608 ShouldNotReachHere(); | |
| 609 } | |
| 610 | |
| 611 // When using CallRuntime mark SOE registers as killed by the call | |
| 612 // so values that could show up in the RegisterMap aren't live in a | |
| 613 // callee saved register since the register wouldn't know where to | |
| 614 // find them. CallLeaf and CallLeafNoFP are ok because they can't | |
| 615 // have debug info on them. Strictly speaking this only needs to be | |
| 616 // done for oops since idealreg2debugmask takes care of debug info | |
| 617 // references but there no way to handle oops differently than other | |
| 618 // pointers as far as the kill mask goes. | |
| 619 bool exclude_soe = op == Op_CallRuntime; | |
| 620 | |
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621 // If the call is a MethodHandle invoke, we need to exclude the |
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622 // register which is used to save the SP value over MH invokes from |
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623 // the mask. Otherwise this register could be used for |
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624 // deoptimization information. |
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625 if (op == Op_CallStaticJava) { |
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626 MachCallStaticJavaNode* mcallstaticjava = (MachCallStaticJavaNode*) mcall; |
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627 if (mcallstaticjava->_method_handle_invoke) |
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628 proj->_rout.OR(Matcher::method_handle_invoke_SP_save_mask()); |
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629 } |
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630 |
| 0 | 631 // Fill in the kill mask for the call |
| 632 for( OptoReg::Name r = OptoReg::Name(0); r < _last_Mach_Reg; r=OptoReg::add(r,1) ) { | |
| 633 if( !regs.Member(r) ) { // Not already defined by the call | |
| 634 // Save-on-call register? | |
| 635 if ((save_policy[r] == 'C') || | |
| 636 (save_policy[r] == 'A') || | |
| 637 ((save_policy[r] == 'E') && exclude_soe)) { | |
| 638 proj->_rout.Insert(r); | |
| 639 } | |
| 640 } | |
| 641 } | |
| 642 | |
| 643 return node_cnt; | |
| 644 } | |
| 645 | |
| 646 | |
| 647 //------------------------------schedule_local--------------------------------- | |
| 648 // Topological sort within a block. Someday become a real scheduler. | |
| 649 bool Block::schedule_local(PhaseCFG *cfg, Matcher &matcher, int *ready_cnt, VectorSet &next_call) { | |
| 650 // Already "sorted" are the block start Node (as the first entry), and | |
| 651 // the block-ending Node and any trailing control projections. We leave | |
| 652 // these alone. PhiNodes and ParmNodes are made to follow the block start | |
| 653 // Node. Everything else gets topo-sorted. | |
| 654 | |
| 655 #ifndef PRODUCT | |
| 656 if (cfg->trace_opto_pipelining()) { | |
| 657 tty->print_cr("# --- schedule_local B%d, before: ---", _pre_order); | |
| 658 for (uint i = 0;i < _nodes.size();i++) { | |
| 659 tty->print("# "); | |
| 660 _nodes[i]->fast_dump(); | |
| 661 } | |
| 662 tty->print_cr("#"); | |
| 663 } | |
| 664 #endif | |
| 665 | |
| 666 // RootNode is already sorted | |
| 667 if( _nodes.size() == 1 ) return true; | |
| 668 | |
| 669 // Move PhiNodes and ParmNodes from 1 to cnt up to the start | |
| 670 uint node_cnt = end_idx(); | |
| 671 uint phi_cnt = 1; | |
| 672 uint i; | |
| 673 for( i = 1; i<node_cnt; i++ ) { // Scan for Phi | |
| 674 Node *n = _nodes[i]; | |
| 675 if( n->is_Phi() || // Found a PhiNode or ParmNode | |
| 676 (n->is_Proj() && n->in(0) == head()) ) { | |
| 677 // Move guy at 'phi_cnt' to the end; makes a hole at phi_cnt | |
| 678 _nodes.map(i,_nodes[phi_cnt]); | |
| 679 _nodes.map(phi_cnt++,n); // swap Phi/Parm up front | |
| 680 } else { // All others | |
| 681 // Count block-local inputs to 'n' | |
| 682 uint cnt = n->len(); // Input count | |
| 683 uint local = 0; | |
| 684 for( uint j=0; j<cnt; j++ ) { | |
| 685 Node *m = n->in(j); | |
| 686 if( m && cfg->_bbs[m->_idx] == this && !m->is_top() ) | |
| 687 local++; // One more block-local input | |
| 688 } | |
| 689 ready_cnt[n->_idx] = local; // Count em up | |
| 690 | |
| 691 // A few node types require changing a required edge to a precedence edge | |
| 692 // before allocation. | |
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693 if( UseConcMarkSweepGC || UseG1GC ) { |
| 0 | 694 if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_StoreCM ) { |
| 695 // Note: Required edges with an index greater than oper_input_base | |
| 696 // are not supported by the allocator. | |
| 697 // Note2: Can only depend on unmatched edge being last, | |
| 698 // can not depend on its absolute position. | |
| 699 Node *oop_store = n->in(n->req() - 1); | |
| 700 n->del_req(n->req() - 1); | |
| 701 n->add_prec(oop_store); | |
| 702 assert(cfg->_bbs[oop_store->_idx]->_dom_depth <= this->_dom_depth, "oop_store must dominate card-mark"); | |
| 703 } | |
| 704 } | |
|
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705 if( n->is_Mach() && n->req() > TypeFunc::Parms && |
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706 (n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire || |
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707 n->as_Mach()->ideal_Opcode() == Op_MemBarVolatile) ) { |
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708 // MemBarAcquire could be created without Precedent edge. |
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709 // del_req() replaces the specified edge with the last input edge |
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710 // and then removes the last edge. If the specified edge > number of |
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711 // edges the last edge will be moved outside of the input edges array |
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712 // and the edge will be lost. This is why this code should be |
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713 // executed only when Precedent (== TypeFunc::Parms) edge is present. |
| 0 | 714 Node *x = n->in(TypeFunc::Parms); |
| 715 n->del_req(TypeFunc::Parms); | |
| 716 n->add_prec(x); | |
| 717 } | |
| 718 } | |
| 719 } | |
| 720 for(uint i2=i; i2<_nodes.size(); i2++ ) // Trailing guys get zapped count | |
| 721 ready_cnt[_nodes[i2]->_idx] = 0; | |
| 722 | |
| 723 // All the prescheduled guys do not hold back internal nodes | |
| 724 uint i3; | |
| 725 for(i3 = 0; i3<phi_cnt; i3++ ) { // For all pre-scheduled | |
| 726 Node *n = _nodes[i3]; // Get pre-scheduled | |
| 727 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
| 728 Node* m = n->fast_out(j); | |
| 729 if( cfg->_bbs[m->_idx] ==this ) // Local-block user | |
| 730 ready_cnt[m->_idx]--; // Fix ready count | |
| 731 } | |
| 732 } | |
| 733 | |
| 734 Node_List delay; | |
| 735 // Make a worklist | |
| 736 Node_List worklist; | |
| 737 for(uint i4=i3; i4<node_cnt; i4++ ) { // Put ready guys on worklist | |
| 738 Node *m = _nodes[i4]; | |
| 739 if( !ready_cnt[m->_idx] ) { // Zero ready count? | |
| 740 if (m->is_iteratively_computed()) { | |
| 741 // Push induction variable increments last to allow other uses | |
| 742 // of the phi to be scheduled first. The select() method breaks | |
| 743 // ties in scheduling by worklist order. | |
| 744 delay.push(m); | |
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745 } else if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CreateEx) { |
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746 // Force the CreateEx to the top of the list so it's processed |
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747 // first and ends up at the start of the block. |
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748 worklist.insert(0, m); |
| 0 | 749 } else { |
| 750 worklist.push(m); // Then on to worklist! | |
| 751 } | |
| 752 } | |
| 753 } | |
| 754 while (delay.size()) { | |
| 755 Node* d = delay.pop(); | |
| 756 worklist.push(d); | |
| 757 } | |
| 758 | |
| 759 // Warm up the 'next_call' heuristic bits | |
| 760 needed_for_next_call(_nodes[0], next_call, cfg->_bbs); | |
| 761 | |
| 762 #ifndef PRODUCT | |
| 763 if (cfg->trace_opto_pipelining()) { | |
| 764 for (uint j=0; j<_nodes.size(); j++) { | |
| 765 Node *n = _nodes[j]; | |
| 766 int idx = n->_idx; | |
| 767 tty->print("# ready cnt:%3d ", ready_cnt[idx]); | |
| 1685 | 768 tty->print("latency:%3d ", cfg->_node_latency->at_grow(idx)); |
| 0 | 769 tty->print("%4d: %s\n", idx, n->Name()); |
| 770 } | |
| 771 } | |
| 772 #endif | |
| 773 | |
| 774 // Pull from worklist and schedule | |
| 775 while( worklist.size() ) { // Worklist is not ready | |
| 776 | |
| 777 #ifndef PRODUCT | |
| 778 if (cfg->trace_opto_pipelining()) { | |
| 779 tty->print("# ready list:"); | |
| 780 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
| 781 Node *n = worklist[i]; // Get Node on worklist | |
| 782 tty->print(" %d", n->_idx); | |
| 783 } | |
| 784 tty->cr(); | |
| 785 } | |
| 786 #endif | |
| 787 | |
| 788 // Select and pop a ready guy from worklist | |
| 789 Node* n = select(cfg, worklist, ready_cnt, next_call, phi_cnt); | |
| 790 _nodes.map(phi_cnt++,n); // Schedule him next | |
| 791 | |
| 792 #ifndef PRODUCT | |
| 793 if (cfg->trace_opto_pipelining()) { | |
| 794 tty->print("# select %d: %s", n->_idx, n->Name()); | |
| 1685 | 795 tty->print(", latency:%d", cfg->_node_latency->at_grow(n->_idx)); |
| 0 | 796 n->dump(); |
| 797 if (Verbose) { | |
| 798 tty->print("# ready list:"); | |
| 799 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
| 800 Node *n = worklist[i]; // Get Node on worklist | |
| 801 tty->print(" %d", n->_idx); | |
| 802 } | |
| 803 tty->cr(); | |
| 804 } | |
| 805 } | |
| 806 | |
| 807 #endif | |
| 808 if( n->is_MachCall() ) { | |
| 809 MachCallNode *mcall = n->as_MachCall(); | |
| 810 phi_cnt = sched_call(matcher, cfg->_bbs, phi_cnt, worklist, ready_cnt, mcall, next_call); | |
| 811 continue; | |
| 812 } | |
| 813 // Children are now all ready | |
| 814 for (DUIterator_Fast i5max, i5 = n->fast_outs(i5max); i5 < i5max; i5++) { | |
| 815 Node* m = n->fast_out(i5); // Get user | |
| 816 if( cfg->_bbs[m->_idx] != this ) continue; | |
| 817 if( m->is_Phi() ) continue; | |
| 818 if( !--ready_cnt[m->_idx] ) | |
| 819 worklist.push(m); | |
| 820 } | |
| 821 } | |
| 822 | |
| 823 if( phi_cnt != end_idx() ) { | |
| 824 // did not schedule all. Retry, Bailout, or Die | |
| 825 Compile* C = matcher.C; | |
| 826 if (C->subsume_loads() == true && !C->failing()) { | |
| 827 // Retry with subsume_loads == false | |
| 828 // If this is the first failure, the sentinel string will "stick" | |
| 829 // to the Compile object, and the C2Compiler will see it and retry. | |
| 830 C->record_failure(C2Compiler::retry_no_subsuming_loads()); | |
| 831 } | |
| 832 // assert( phi_cnt == end_idx(), "did not schedule all" ); | |
| 833 return false; | |
| 834 } | |
| 835 | |
| 836 #ifndef PRODUCT | |
| 837 if (cfg->trace_opto_pipelining()) { | |
| 838 tty->print_cr("#"); | |
| 839 tty->print_cr("# after schedule_local"); | |
| 840 for (uint i = 0;i < _nodes.size();i++) { | |
| 841 tty->print("# "); | |
| 842 _nodes[i]->fast_dump(); | |
| 843 } | |
| 844 tty->cr(); | |
| 845 } | |
| 846 #endif | |
| 847 | |
| 848 | |
| 849 return true; | |
| 850 } | |
| 851 | |
| 852 //--------------------------catch_cleanup_fix_all_inputs----------------------- | |
| 853 static void catch_cleanup_fix_all_inputs(Node *use, Node *old_def, Node *new_def) { | |
| 854 for (uint l = 0; l < use->len(); l++) { | |
| 855 if (use->in(l) == old_def) { | |
| 856 if (l < use->req()) { | |
| 857 use->set_req(l, new_def); | |
| 858 } else { | |
| 859 use->rm_prec(l); | |
| 860 use->add_prec(new_def); | |
| 861 l--; | |
| 862 } | |
| 863 } | |
| 864 } | |
| 865 } | |
| 866 | |
| 867 //------------------------------catch_cleanup_find_cloned_def------------------ | |
| 868 static Node *catch_cleanup_find_cloned_def(Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) { | |
| 869 assert( use_blk != def_blk, "Inter-block cleanup only"); | |
| 870 | |
| 871 // The use is some block below the Catch. Find and return the clone of the def | |
| 872 // that dominates the use. If there is no clone in a dominating block, then | |
| 873 // create a phi for the def in a dominating block. | |
| 874 | |
| 875 // Find which successor block dominates this use. The successor | |
| 876 // blocks must all be single-entry (from the Catch only; I will have | |
| 877 // split blocks to make this so), hence they all dominate. | |
| 878 while( use_blk->_dom_depth > def_blk->_dom_depth+1 ) | |
| 879 use_blk = use_blk->_idom; | |
| 880 | |
| 881 // Find the successor | |
| 882 Node *fixup = NULL; | |
| 883 | |
| 884 uint j; | |
| 885 for( j = 0; j < def_blk->_num_succs; j++ ) | |
| 886 if( use_blk == def_blk->_succs[j] ) | |
| 887 break; | |
| 888 | |
| 889 if( j == def_blk->_num_succs ) { | |
| 890 // Block at same level in dom-tree is not a successor. It needs a | |
| 891 // PhiNode, the PhiNode uses from the def and IT's uses need fixup. | |
| 892 Node_Array inputs = new Node_List(Thread::current()->resource_area()); | |
| 893 for(uint k = 1; k < use_blk->num_preds(); k++) { | |
| 894 inputs.map(k, catch_cleanup_find_cloned_def(bbs[use_blk->pred(k)->_idx], def, def_blk, bbs, n_clone_idx)); | |
| 895 } | |
| 896 | |
| 897 // Check to see if the use_blk already has an identical phi inserted. | |
| 898 // If it exists, it will be at the first position since all uses of a | |
| 899 // def are processed together. | |
| 900 Node *phi = use_blk->_nodes[1]; | |
| 901 if( phi->is_Phi() ) { | |
| 902 fixup = phi; | |
| 903 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
| 904 if (phi->in(k) != inputs[k]) { | |
| 905 // Not a match | |
| 906 fixup = NULL; | |
| 907 break; | |
| 908 } | |
| 909 } | |
| 910 } | |
| 911 | |
| 912 // If an existing PhiNode was not found, make a new one. | |
| 913 if (fixup == NULL) { | |
| 914 Node *new_phi = PhiNode::make(use_blk->head(), def); | |
| 915 use_blk->_nodes.insert(1, new_phi); | |
| 916 bbs.map(new_phi->_idx, use_blk); | |
| 917 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
| 918 new_phi->set_req(k, inputs[k]); | |
| 919 } | |
| 920 fixup = new_phi; | |
| 921 } | |
| 922 | |
| 923 } else { | |
| 924 // Found the use just below the Catch. Make it use the clone. | |
| 925 fixup = use_blk->_nodes[n_clone_idx]; | |
| 926 } | |
| 927 | |
| 928 return fixup; | |
| 929 } | |
| 930 | |
| 931 //--------------------------catch_cleanup_intra_block-------------------------- | |
| 932 // Fix all input edges in use that reference "def". The use is in the same | |
| 933 // block as the def and both have been cloned in each successor block. | |
| 934 static void catch_cleanup_intra_block(Node *use, Node *def, Block *blk, int beg, int n_clone_idx) { | |
| 935 | |
| 936 // Both the use and def have been cloned. For each successor block, | |
| 937 // get the clone of the use, and make its input the clone of the def | |
| 938 // found in that block. | |
| 939 | |
| 940 uint use_idx = blk->find_node(use); | |
| 941 uint offset_idx = use_idx - beg; | |
| 942 for( uint k = 0; k < blk->_num_succs; k++ ) { | |
| 943 // Get clone in each successor block | |
| 944 Block *sb = blk->_succs[k]; | |
| 945 Node *clone = sb->_nodes[offset_idx+1]; | |
| 946 assert( clone->Opcode() == use->Opcode(), "" ); | |
| 947 | |
| 948 // Make use-clone reference the def-clone | |
| 949 catch_cleanup_fix_all_inputs(clone, def, sb->_nodes[n_clone_idx]); | |
| 950 } | |
| 951 } | |
| 952 | |
| 953 //------------------------------catch_cleanup_inter_block--------------------- | |
| 954 // Fix all input edges in use that reference "def". The use is in a different | |
| 955 // block than the def. | |
| 956 static void catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) { | |
| 957 if( !use_blk ) return; // Can happen if the use is a precedence edge | |
| 958 | |
| 959 Node *new_def = catch_cleanup_find_cloned_def(use_blk, def, def_blk, bbs, n_clone_idx); | |
| 960 catch_cleanup_fix_all_inputs(use, def, new_def); | |
| 961 } | |
| 962 | |
| 963 //------------------------------call_catch_cleanup----------------------------- | |
| 964 // If we inserted any instructions between a Call and his CatchNode, | |
| 965 // clone the instructions on all paths below the Catch. | |
| 966 void Block::call_catch_cleanup(Block_Array &bbs) { | |
| 967 | |
| 968 // End of region to clone | |
| 969 uint end = end_idx(); | |
| 970 if( !_nodes[end]->is_Catch() ) return; | |
| 971 // Start of region to clone | |
| 972 uint beg = end; | |
| 973 while( _nodes[beg-1]->Opcode() != Op_MachProj || | |
| 974 !_nodes[beg-1]->in(0)->is_Call() ) { | |
| 975 beg--; | |
| 976 assert(beg > 0,"Catch cleanup walking beyond block boundary"); | |
| 977 } | |
| 978 // Range of inserted instructions is [beg, end) | |
| 979 if( beg == end ) return; | |
| 980 | |
| 981 // Clone along all Catch output paths. Clone area between the 'beg' and | |
| 982 // 'end' indices. | |
| 983 for( uint i = 0; i < _num_succs; i++ ) { | |
| 984 Block *sb = _succs[i]; | |
| 985 // Clone the entire area; ignoring the edge fixup for now. | |
| 986 for( uint j = end; j > beg; j-- ) { | |
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987 // It is safe here to clone a node with anti_dependence |
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988 // since clones dominate on each path. |
| 0 | 989 Node *clone = _nodes[j-1]->clone(); |
| 990 sb->_nodes.insert( 1, clone ); | |
| 991 bbs.map(clone->_idx,sb); | |
| 992 } | |
| 993 } | |
| 994 | |
| 995 | |
| 996 // Fixup edges. Check the def-use info per cloned Node | |
| 997 for(uint i2 = beg; i2 < end; i2++ ) { | |
| 998 uint n_clone_idx = i2-beg+1; // Index of clone of n in each successor block | |
| 999 Node *n = _nodes[i2]; // Node that got cloned | |
| 1000 // Need DU safe iterator because of edge manipulation in calls. | |
| 1001 Unique_Node_List *out = new Unique_Node_List(Thread::current()->resource_area()); | |
| 1002 for (DUIterator_Fast j1max, j1 = n->fast_outs(j1max); j1 < j1max; j1++) { | |
| 1003 out->push(n->fast_out(j1)); | |
| 1004 } | |
| 1005 uint max = out->size(); | |
| 1006 for (uint j = 0; j < max; j++) {// For all users | |
| 1007 Node *use = out->pop(); | |
| 1008 Block *buse = bbs[use->_idx]; | |
| 1009 if( use->is_Phi() ) { | |
| 1010 for( uint k = 1; k < use->req(); k++ ) | |
| 1011 if( use->in(k) == n ) { | |
| 1012 Node *fixup = catch_cleanup_find_cloned_def(bbs[buse->pred(k)->_idx], n, this, bbs, n_clone_idx); | |
| 1013 use->set_req(k, fixup); | |
| 1014 } | |
| 1015 } else { | |
| 1016 if (this == buse) { | |
| 1017 catch_cleanup_intra_block(use, n, this, beg, n_clone_idx); | |
| 1018 } else { | |
| 1019 catch_cleanup_inter_block(use, buse, n, this, bbs, n_clone_idx); | |
| 1020 } | |
| 1021 } | |
| 1022 } // End for all users | |
| 1023 | |
| 1024 } // End of for all Nodes in cloned area | |
| 1025 | |
| 1026 // Remove the now-dead cloned ops | |
| 1027 for(uint i3 = beg; i3 < end; i3++ ) { | |
| 1028 _nodes[beg]->disconnect_inputs(NULL); | |
| 1029 _nodes.remove(beg); | |
| 1030 } | |
| 1031 | |
| 1032 // If the successor blocks have a CreateEx node, move it back to the top | |
| 1033 for(uint i4 = 0; i4 < _num_succs; i4++ ) { | |
| 1034 Block *sb = _succs[i4]; | |
| 1035 uint new_cnt = end - beg; | |
| 1036 // Remove any newly created, but dead, nodes. | |
| 1037 for( uint j = new_cnt; j > 0; j-- ) { | |
| 1038 Node *n = sb->_nodes[j]; | |
| 1039 if (n->outcnt() == 0 && | |
| 1040 (!n->is_Proj() || n->as_Proj()->in(0)->outcnt() == 1) ){ | |
| 1041 n->disconnect_inputs(NULL); | |
| 1042 sb->_nodes.remove(j); | |
| 1043 new_cnt--; | |
| 1044 } | |
| 1045 } | |
| 1046 // If any newly created nodes remain, move the CreateEx node to the top | |
| 1047 if (new_cnt > 0) { | |
| 1048 Node *cex = sb->_nodes[1+new_cnt]; | |
| 1049 if( cex->is_Mach() && cex->as_Mach()->ideal_Opcode() == Op_CreateEx ) { | |
| 1050 sb->_nodes.remove(1+new_cnt); | |
| 1051 sb->_nodes.insert(1,cex); | |
| 1052 } | |
| 1053 } | |
| 1054 } | |
| 1055 } |