1 /* 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OPTO_REGALLOC_HPP 26 #define SHARE_VM_OPTO_REGALLOC_HPP 27 28 #include "code/vmreg.hpp" 29 #include "opto/block.hpp" 30 #include "opto/matcher.hpp" 31 #include "opto/phase.hpp" 32 33 class Node; 34 class Matcher; 35 class PhaseCFG; 36 37 #define MAX_REG_ALLOCATORS 10 38 39 //------------------------------PhaseRegAlloc------------------------------------ 40 // Abstract register allocator 41 class PhaseRegAlloc : public Phase { 42 static void (*_alloc_statistics[MAX_REG_ALLOCATORS])(); 43 static int _num_allocators; 44 45 protected: 46 OptoRegPair *_node_regs; 47 uint _node_regs_max_index; 48 VectorSet _node_oops; // Mapping from node indices to oopiness 49 50 void alloc_node_regs(int size); // allocate _node_regs table with at least "size" elements 51 52 PhaseRegAlloc( uint unique, PhaseCFG &cfg, Matcher &matcher, 53 void (*pr_stats)()); 54 public: 55 PhaseCFG &_cfg; // Control flow graph 56 uint _framesize; // Size of frame in stack-slots. not counting preserve area 57 OptoReg::Name _max_reg; // Past largest register seen 58 Matcher &_matcher; // Convert Ideal to MachNodes 59 uint node_regs_max_index() const { return _node_regs_max_index; } 60 61 // Get the register associated with the Node 62 OptoReg::Name get_reg_first( const Node *n ) const { 63 debug_only( if( n->_idx >= _node_regs_max_index ) n->dump(); ); 64 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array"); 65 return _node_regs[n->_idx].first(); 66 } 67 OptoReg::Name get_reg_second( const Node *n ) const { 68 debug_only( if( n->_idx >= _node_regs_max_index ) n->dump(); ); 69 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array"); 70 return _node_regs[n->_idx].second(); 71 } 72 73 // Do all the real work of allocate 74 virtual void Register_Allocate() = 0; 75 76 77 // notify the register allocator that "node" is a new reference 78 // to the value produced by "old_node" 79 virtual void add_reference( const Node *node, const Node *old_node) = 0; 80 81 82 // Set the register associated with a new Node 83 void set_bad( uint idx ) { 84 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 85 _node_regs[idx].set_bad(); 86 } 87 void set1( uint idx, OptoReg::Name reg ) { 88 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 89 _node_regs[idx].set1(reg); 90 } 91 void set2( uint idx, OptoReg::Name reg ) { 92 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 93 _node_regs[idx].set2(reg); 94 } 95 void set_pair( uint idx, OptoReg::Name hi, OptoReg::Name lo ) { 96 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 97 _node_regs[idx].set_pair(hi, lo); 98 } 99 void set_ptr( uint idx, OptoReg::Name reg ) { 100 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 101 _node_regs[idx].set_ptr(reg); 102 } 103 // Set and query if a node produces an oop 104 void set_oop( const Node *n, bool ); 105 bool is_oop( const Node *n ) const; 106 107 // Convert a register number to a stack offset 108 int reg2offset ( OptoReg::Name reg ) const; 109 int reg2offset_unchecked( OptoReg::Name reg ) const; 110 111 // Convert a stack offset to a register number 112 OptoReg::Name offset2reg( int stk_offset ) const; 113 114 // Get the register encoding associated with the Node 115 int get_encode( const Node *n ) const { 116 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array"); 117 OptoReg::Name first = _node_regs[n->_idx].first(); 118 OptoReg::Name second = _node_regs[n->_idx].second(); 119 assert( !OptoReg::is_valid(second) || second == first+1, "" ); 120 assert(OptoReg::is_reg(first), "out of range"); 121 return Matcher::_regEncode[first]; 122 } 123 124 // Platform dependent hook for actions prior to allocation 125 void pd_preallocate_hook(); 126 127 #ifdef ASSERT 128 // Platform dependent hook for verification after allocation. Will 129 // only get called when compiling with asserts. 130 void pd_postallocate_verify_hook(); 131 #endif 132 133 #ifndef PRODUCT 134 static int _total_framesize; 135 static int _max_framesize; 136 137 virtual void dump_frame() const = 0; 138 virtual char *dump_register( const Node *n, char *buf ) const = 0; 139 static void print_statistics(); 140 #endif 141 }; 142 143 #endif // SHARE_VM_OPTO_REGALLOC_HPP