regalloc.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 2000, 2006, 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 25class Node; 26class Matcher; 27class PhaseCFG; 28 29#define MAX_REG_ALLOCATORS 10 30 31//------------------------------PhaseRegAlloc------------------------------------ 32// Abstract register allocator 33class PhaseRegAlloc : public Phase { 34 static void (*_alloc_statistics[MAX_REG_ALLOCATORS])(); 35 static int _num_allocators; 36 37protected: 38 OptoRegPair *_node_regs; 39 uint _node_regs_max_index; 40 VectorSet _node_oops; // Mapping from node indices to oopiness 41 42 void alloc_node_regs(int size); // allocate _node_regs table with at least "size" elements 43 44 PhaseRegAlloc( uint unique, PhaseCFG &cfg, Matcher &matcher, 45 void (*pr_stats)()); 46public: 47 PhaseCFG &_cfg; // Control flow graph 48 uint _framesize; // Size of frame in stack-slots. not counting preserve area 49 OptoReg::Name _max_reg; // Past largest register seen 50 Matcher &_matcher; // Convert Ideal to MachNodes 51 uint node_regs_max_index() const { return _node_regs_max_index; } 52 53 // Get the register associated with the Node 54 OptoReg::Name get_reg_first( const Node *n ) const { 55 debug_only( if( n->_idx >= _node_regs_max_index ) n->dump(); ); 56 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array"); 57 return _node_regs[n->_idx].first(); 58 } 59 OptoReg::Name get_reg_second( const Node *n ) const { 60 debug_only( if( n->_idx >= _node_regs_max_index ) n->dump(); ); 61 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array"); 62 return _node_regs[n->_idx].second(); 63 } 64 65 // Do all the real work of allocate 66 virtual void Register_Allocate() = 0; 67 68 69 // notify the register allocator that "node" is a new reference 70 // to the value produced by "old_node" 71 virtual void add_reference( const Node *node, const Node *old_node) = 0; 72 73 74 // Set the register associated with a new Node 75 void set_bad( uint idx ) { 76 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 77 _node_regs[idx].set_bad(); 78 } 79 void set1( uint idx, OptoReg::Name reg ) { 80 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 81 _node_regs[idx].set1(reg); 82 } 83 void set2( uint idx, OptoReg::Name reg ) { 84 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 85 _node_regs[idx].set2(reg); 86 } 87 void set_pair( uint idx, OptoReg::Name hi, OptoReg::Name lo ) { 88 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 89 _node_regs[idx].set_pair(hi, lo); 90 } 91 void set_ptr( uint idx, OptoReg::Name reg ) { 92 assert( idx < _node_regs_max_index, "Exceeded _node_regs array"); 93 _node_regs[idx].set_ptr(reg); 94 } 95 // Set and query if a node produces an oop 96 void set_oop( const Node *n, bool ); 97 bool is_oop( const Node *n ) const; 98 99 // Convert a register number to a stack offset 100 int reg2offset ( OptoReg::Name reg ) const; 101 int reg2offset_unchecked( OptoReg::Name reg ) const; 102 103 // Convert a stack offset to a register number 104 OptoReg::Name offset2reg( int stk_offset ) const; 105 106 // Get the register encoding associated with the Node 107 int get_encode( const Node *n ) const { 108 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array"); 109 OptoReg::Name first = _node_regs[n->_idx].first(); 110 OptoReg::Name second = _node_regs[n->_idx].second(); 111 assert( !OptoReg::is_valid(second) || second == first+1, "" ); 112 assert(OptoReg::is_reg(first), "out of range"); 113 return Matcher::_regEncode[first]; 114 } 115 116 // Platform dependent hook for actions prior to allocation 117 void pd_preallocate_hook(); 118 119#ifdef ASSERT 120 // Platform dependent hook for verification after allocation. Will 121 // only get called when compiling with asserts. 122 void pd_postallocate_verify_hook(); 123#endif 124 125#ifndef PRODUCT 126 static int _total_framesize; 127 static int _max_framesize; 128 129 virtual void dump_frame() const = 0; 130 virtual char *dump_register( const Node *n, char *buf ) const = 0; 131 static void print_statistics(); 132#endif 133}; 134