c1_ValueMap.hpp revision 1879:f95d63e2154a
1164640Sflz/* 298186Sgordon * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 378344Sobrien * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4157473Sflz * 578344Sobrien * This code is free software; you can redistribute it and/or modify it 678344Sobrien * under the terms of the GNU General Public License version 2 only, as 778344Sobrien * published by the Free Software Foundation. 878344Sobrien * 978344Sobrien * This code is distributed in the hope that it will be useful, but WITHOUT 1078344Sobrien * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1178344Sobrien * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1278344Sobrien * version 2 for more details (a copy is included in the LICENSE file that 1378344Sobrien * accompanied this code). 1478344Sobrien * 1578344Sobrien * You should have received a copy of the GNU General Public License version 1678344Sobrien * 2 along with this work; if not, write to the Free Software Foundation, 1778344Sobrien * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1878344Sobrien * 1978344Sobrien * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2078344Sobrien * or visit www.oracle.com if you need additional information or have any 2178344Sobrien * questions. 2278344Sobrien * 2378344Sobrien */ 2478344Sobrien 2578344Sobrien#ifndef SHARE_VM_C1_C1_VALUEMAP_HPP 2678344Sobrien#define SHARE_VM_C1_C1_VALUEMAP_HPP 2778344Sobrien 2878344Sobrien#include "c1/c1_Instruction.hpp" 2978344Sobrien#include "c1/c1_ValueSet.hpp" 3078344Sobrien#include "memory/allocation.hpp" 3178344Sobrien 3278344Sobrienclass ValueMapEntry: public CompilationResourceObj { 3378344Sobrien private: 3478344Sobrien intx _hash; 35157473Sflz Value _value; 36169668Smtm int _nesting; 37157473Sflz ValueMapEntry* _next; 3878344Sobrien 3998186Sgordon public: 4098186Sgordon ValueMapEntry(intx hash, Value value, int nesting, ValueMapEntry* next) 4198186Sgordon : _hash(hash) 42131550Scperciva , _value(value) 43131550Scperciva , _nesting(nesting) 44131550Scperciva , _next(next) 45131550Scperciva { 4698186Sgordon } 4798186Sgordon 48202988Semaste intx hash() { return _hash; } 49124832Smtm Value value() { return _value; } 50124832Smtm int nesting() { return _nesting; } 51161435Syar ValueMapEntry* next() { return _next; } 52161435Syar 5398186Sgordon void set_next(ValueMapEntry* next) { _next = next; } 5498186Sgordon}; 5578344Sobrien 5678344Sobriendefine_array(ValueMapEntryArray, ValueMapEntry*) 5778344Sobriendefine_stack(ValueMapEntryList, ValueMapEntryArray) 58197144Shrs 5978344Sobrien// ValueMap implements nested hash tables for value numbering. It 60197144Shrs// maintains a set _killed_values which represents the instructions 61197144Shrs// which have been killed so far and an array of linked lists of 6298186Sgordon// ValueMapEntries names _entries. Each ValueMapEntry has a nesting 63197144Shrs// which indicates what ValueMap nesting it belongs to. Higher 64197144Shrs// nesting values are always before lower values in the linked list. 65197144Shrs// This allows cloning of parent ValueMaps by simply copying the heads 66197144Shrs// of the list. _entry_count represents the number of reachable 67197144Shrs// entries in the ValueMap. A ValueMap is only allowed to mutate 68197144Shrs// ValueMapEntries with the same nesting level. Adding or removing 69197144Shrs// entries at the current nesting level requires updating 70197144Shrs// _entry_count. Elements in the parent's list that get killed can be 71197144Shrs// skipped if they are at the head of the list by simply moving to the 7298186Sgordon// next element in the list and decrementing _entry_count. 7398186Sgordon 74197144Shrsclass ValueMap: public CompilationResourceObj { 75197144Shrs private: 76197144Shrs int _nesting; 7798186Sgordon ValueMapEntryArray _entries; 78197144Shrs ValueSet _killed_values; 79197144Shrs int _entry_count; 8098186Sgordon 8198186Sgordon int nesting() { return _nesting; } 82197144Shrs bool is_local_value_numbering() { return _nesting == 0; } 83197144Shrs bool is_global_value_numbering() { return _nesting > 0; } 84197144Shrs 85197144Shrs int entry_count() { return _entry_count; } 86197144Shrs int size() { return _entries.length(); } 87197144Shrs ValueMapEntry* entry_at(int i) { return _entries.at(i); } 88197144Shrs 89197144Shrs // calculates the index of a hash value in a hash table of size n 90197144Shrs int entry_index(intx hash, int n) { return (unsigned int)hash % n; } 91197144Shrs 92197144Shrs // if entry_count > size_threshold, the size of the hash table is increased 93197144Shrs int size_threshold() { return size(); } 94197144Shrs 9598186Sgordon // management of the killed-bitset for global value numbering 9698186Sgordon void kill_value(Value v) { if (is_global_value_numbering()) _killed_values.put(v); } 9798186Sgordon bool is_killed(Value v) { if (is_global_value_numbering()) return _killed_values.contains(v); else return false; } 9898186Sgordon 99197144Shrs // helper functions 100197144Shrs void increase_table_size(); 101197144Shrs 10298186Sgordon#ifndef PRODUCT 103197144Shrs static int _number_of_finds; 104197144Shrs static int _number_of_hits; 105197144Shrs static int _number_of_kills; 106197144Shrs#endif // PRODUCT 107197144Shrs 108197144Shrs public: 109197144Shrs // creation 110197144Shrs ValueMap(); // empty value map 111197144Shrs ValueMap(ValueMap* old); // value map with increased nesting 112197144Shrs 113197144Shrs // manipulation 114197144Shrs Value find_insert(Value x); 115197144Shrs 11698186Sgordon void kill_memory(); 11798186Sgordon void kill_field(ciField* field); 11898186Sgordon void kill_array(ValueType* type); 11998186Sgordon void kill_exception(); 12098186Sgordon void kill_map(ValueMap* map); 12198186Sgordon void kill_all(); 12298186Sgordon 12398186Sgordon#ifndef PRODUCT 12498186Sgordon // debugging/printing 12598186Sgordon void print(); 12698186Sgordon 127146490Sschweikh static void reset_statistics(); 12898186Sgordon static void print_statistics(); 12998186Sgordon#endif 13098186Sgordon}; 13198186Sgordon 13298186Sgordondefine_array(ValueMapArray, ValueMap*) 13398186Sgordon 13498186Sgordon 13578344Sobrienclass ValueNumberingVisitor: public InstructionVisitor { 13678344Sobrien protected: 13778344Sobrien // called by visitor functions for instructions that kill values 13878344Sobrien virtual void kill_memory() = 0; 13978344Sobrien virtual void kill_field(ciField* field) = 0; 14078344Sobrien virtual void kill_array(ValueType* type) = 0; 14178344Sobrien 14298186Sgordon // visitor functions 14378344Sobrien void do_StoreField (StoreField* x) { 14478344Sobrien if (!x->is_initialized()) { 14578344Sobrien kill_memory(); 14678344Sobrien } else { 14778344Sobrien kill_field(x->field()); 14878344Sobrien } 14978344Sobrien } 15078344Sobrien void do_StoreIndexed (StoreIndexed* x) { kill_array(x->type()); } 15178344Sobrien void do_MonitorEnter (MonitorEnter* x) { kill_memory(); } 15278344Sobrien void do_MonitorExit (MonitorExit* x) { kill_memory(); } 15378344Sobrien void do_Invoke (Invoke* x) { kill_memory(); } 15478344Sobrien void do_UnsafePutRaw (UnsafePutRaw* x) { kill_memory(); } 155157473Sflz void do_UnsafePutObject(UnsafePutObject* x) { kill_memory(); } 15678344Sobrien void do_Intrinsic (Intrinsic* x) { if (!x->preserves_state()) kill_memory(); } 15778344Sobrien 15878344Sobrien void do_Phi (Phi* x) { /* nothing to do */ } 15978344Sobrien void do_Local (Local* x) { /* nothing to do */ } 16078344Sobrien void do_Constant (Constant* x) { /* nothing to do */ } 161157473Sflz void do_LoadField (LoadField* x) { 16298186Sgordon if (!x->is_initialized()) { 16398186Sgordon kill_memory(); 16478344Sobrien } 16598186Sgordon } 16698186Sgordon void do_ArrayLength (ArrayLength* x) { /* nothing to do */ } 16798186Sgordon void do_LoadIndexed (LoadIndexed* x) { /* nothing to do */ } 168126286Smtm void do_NegateOp (NegateOp* x) { /* nothing to do */ } 16998186Sgordon void do_ArithmeticOp (ArithmeticOp* x) { /* nothing to do */ } 17098186Sgordon void do_ShiftOp (ShiftOp* x) { /* nothing to do */ } 17198186Sgordon void do_LogicOp (LogicOp* x) { /* nothing to do */ } 17298186Sgordon void do_CompareOp (CompareOp* x) { /* nothing to do */ } 17398186Sgordon void do_IfOp (IfOp* x) { /* nothing to do */ } 174169668Smtm void do_Convert (Convert* x) { /* nothing to do */ } 175169668Smtm void do_NullCheck (NullCheck* x) { /* nothing to do */ } 176169668Smtm void do_NewInstance (NewInstance* x) { /* nothing to do */ } 177169668Smtm void do_NewTypeArray (NewTypeArray* x) { /* nothing to do */ } 17878344Sobrien void do_NewObjectArray (NewObjectArray* x) { /* nothing to do */ } 179169668Smtm void do_NewMultiArray (NewMultiArray* x) { /* nothing to do */ } 180169668Smtm void do_CheckCast (CheckCast* x) { /* nothing to do */ } 181169668Smtm void do_InstanceOf (InstanceOf* x) { /* nothing to do */ } 182169668Smtm void do_BlockBegin (BlockBegin* x) { /* nothing to do */ } 183178776Smaxim void do_Goto (Goto* x) { /* nothing to do */ } 184178776Smaxim void do_If (If* x) { /* nothing to do */ } 185178770Smtm void do_IfInstanceOf (IfInstanceOf* x) { /* nothing to do */ } 186169668Smtm void do_TableSwitch (TableSwitch* x) { /* nothing to do */ } 187178770Smtm void do_LookupSwitch (LookupSwitch* x) { /* nothing to do */ } 188178770Smtm void do_Return (Return* x) { /* nothing to do */ } 189169668Smtm void do_Throw (Throw* x) { /* nothing to do */ } 190178770Smtm void do_Base (Base* x) { /* nothing to do */ } 191178775Smaxim void do_OsrEntry (OsrEntry* x) { /* nothing to do */ } 192169668Smtm void do_ExceptionObject(ExceptionObject* x) { /* nothing to do */ } 193169668Smtm void do_RoundFP (RoundFP* x) { /* nothing to do */ } 194169668Smtm void do_UnsafeGetRaw (UnsafeGetRaw* x) { /* nothing to do */ } 195169668Smtm void do_ProfileInvoke (ProfileInvoke* x) { /* nothing to do */ }; 196169668Smtm void do_UnsafeGetObject(UnsafeGetObject* x) { /* nothing to do */ } 197169668Smtm void do_UnsafePrefetchRead (UnsafePrefetchRead* x) { /* nothing to do */ } 198169668Smtm void do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) { /* nothing to do */ } 199169668Smtm void do_ProfileCall (ProfileCall* x) { /* nothing to do */ } 20098186Sgordon}; 20198186Sgordon 20298186Sgordon 20398186Sgordonclass ValueNumberingEffects: public ValueNumberingVisitor { 20498186Sgordon private: 20578344Sobrien ValueMap* _map; 20678344Sobrien 20798186Sgordon public: 20878344Sobrien // implementation for abstract methods of ValueNumberingVisitor 20978344Sobrien void kill_memory() { _map->kill_memory(); } 210126285Smtm void kill_field(ciField* field) { _map->kill_field(field); } 21178344Sobrien void kill_array(ValueType* type) { _map->kill_array(type); } 21278344Sobrien 213126285Smtm ValueNumberingEffects(ValueMap* map): _map(map) {} 21478344Sobrien}; 21578344Sobrien 216126285Smtm 217126285Smtmclass GlobalValueNumbering: public ValueNumberingVisitor { 218126285Smtm private: 21978344Sobrien ValueMap* _current_map; // value map of current block 22078344Sobrien ValueMapArray _value_maps; // list of value maps for all blocks 22198186Sgordon 22278344Sobrien public: 22378344Sobrien // accessors 22478344Sobrien ValueMap* current_map() { return _current_map; } 22578344Sobrien ValueMap* value_map_of(BlockBegin* block) { return _value_maps.at(block->linear_scan_number()); } 22698186Sgordon void set_value_map_of(BlockBegin* block, ValueMap* map) { assert(value_map_of(block) == NULL, ""); _value_maps.at_put(block->linear_scan_number(), map); } 22798186Sgordon 22878344Sobrien // implementation for abstract methods of ValueNumberingVisitor 22998186Sgordon void kill_memory() { current_map()->kill_memory(); } 23098186Sgordon void kill_field(ciField* field) { current_map()->kill_field(field); } 23178344Sobrien void kill_array(ValueType* type) { current_map()->kill_array(type); } 23278344Sobrien 23378344Sobrien // main entry point that performs global value numbering 23478344Sobrien GlobalValueNumbering(IR* ir); 23578344Sobrien}; 23698186Sgordon 23778344Sobrien#endif // SHARE_VM_C1_C1_VALUEMAP_HPP 23898186Sgordon