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