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