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1 /*
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2 * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class Node;
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26 class Matcher;
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27 class PhaseCFG;
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28
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29 #define MAX_REG_ALLOCATORS 10
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30
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31 //------------------------------PhaseRegAlloc------------------------------------
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32 // Abstract register allocator
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33 class PhaseRegAlloc : public Phase {
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34 static void (*_alloc_statistics[MAX_REG_ALLOCATORS])();
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35 static int _num_allocators;
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36
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37 protected:
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38 OptoRegPair *_node_regs;
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39 uint _node_regs_max_index;
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40 VectorSet _node_oops; // Mapping from node indices to oopiness
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41
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42 void alloc_node_regs(int size); // allocate _node_regs table with at least "size" elements
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43
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44 PhaseRegAlloc( uint unique, PhaseCFG &cfg, Matcher &matcher,
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45 void (*pr_stats)());
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46 public:
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47 PhaseCFG &_cfg; // Control flow graph
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48 uint _framesize; // Size of frame in stack-slots. not counting preserve area
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49 OptoReg::Name _max_reg; // Past largest register seen
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50 Matcher &_matcher; // Convert Ideal to MachNodes
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51 uint node_regs_max_index() const { return _node_regs_max_index; }
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52
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53 // Get the register associated with the Node
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54 OptoReg::Name get_reg_first( const Node *n ) const {
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55 debug_only( if( n->_idx >= _node_regs_max_index ) n->dump(); );
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56 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array");
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57 return _node_regs[n->_idx].first();
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58 }
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59 OptoReg::Name get_reg_second( const Node *n ) const {
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60 debug_only( if( n->_idx >= _node_regs_max_index ) n->dump(); );
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61 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array");
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62 return _node_regs[n->_idx].second();
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63 }
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64
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65 // Do all the real work of allocate
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66 virtual void Register_Allocate() = 0;
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67
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68
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69 // notify the register allocator that "node" is a new reference
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70 // to the value produced by "old_node"
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71 virtual void add_reference( const Node *node, const Node *old_node) = 0;
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72
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73
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74 // Set the register associated with a new Node
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75 void set_bad( uint idx ) {
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76 assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
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77 _node_regs[idx].set_bad();
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78 }
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79 void set1( uint idx, OptoReg::Name reg ) {
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80 assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
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81 _node_regs[idx].set1(reg);
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82 }
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83 void set2( uint idx, OptoReg::Name reg ) {
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84 assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
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85 _node_regs[idx].set2(reg);
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86 }
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87 void set_pair( uint idx, OptoReg::Name hi, OptoReg::Name lo ) {
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88 assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
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89 _node_regs[idx].set_pair(hi, lo);
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90 }
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91 void set_ptr( uint idx, OptoReg::Name reg ) {
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92 assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
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93 _node_regs[idx].set_ptr(reg);
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94 }
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95 // Set and query if a node produces an oop
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96 void set_oop( const Node *n, bool );
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97 bool is_oop( const Node *n ) const;
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98
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99 // Convert a register number to a stack offset
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100 int reg2offset ( OptoReg::Name reg ) const;
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101 int reg2offset_unchecked( OptoReg::Name reg ) const;
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102
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103 // Convert a stack offset to a register number
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104 OptoReg::Name offset2reg( int stk_offset ) const;
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105
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106 // Get the register encoding associated with the Node
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107 int get_encode( const Node *n ) const {
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108 assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array");
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109 OptoReg::Name first = _node_regs[n->_idx].first();
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110 OptoReg::Name second = _node_regs[n->_idx].second();
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111 assert( !OptoReg::is_valid(second) || second == first+1, "" );
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112 assert(OptoReg::is_reg(first), "out of range");
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113 return Matcher::_regEncode[first];
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114 }
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115
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116 // Platform dependent hook for actions prior to allocation
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117 void pd_preallocate_hook();
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118
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119 #ifdef ASSERT
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120 // Platform dependent hook for verification after allocation. Will
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121 // only get called when compiling with asserts.
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122 void pd_postallocate_verify_hook();
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123 #endif
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124
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125 #ifndef PRODUCT
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126 static int _total_framesize;
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127 static int _max_framesize;
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128
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129 virtual void dump_frame() const = 0;
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130 virtual char *dump_register( const Node *n, char *buf ) const = 0;
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131 static void print_statistics();
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132 #endif
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133 };
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