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
25 class Node;
26 class Matcher;
27 class PhaseCFG;
28
29 #define MAX_REG_ALLOCATORS 10
30
31 //------------------------------PhaseRegAlloc------------------------------------
32 // Abstract register allocator
33 class PhaseRegAlloc : public Phase {
34 static void (*_alloc_statistics[MAX_REG_ALLOCATORS])();
35 static int _num_allocators;
36
37 protected:
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)());
46 public:
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 };