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annotate src/share/vm/opto/optoreg.hpp @ 17480:1b46c3672650
Merge
author | kizune |
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date | Fri, 13 Dec 2013 22:13:52 +0400 |
parents | a7114d3d712e |
children | de6a9e811145 |
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0 | 1 /* |
3939 | 2 * Copyright (c) 2006, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OPTO_OPTOREG_HPP |
26 #define SHARE_VM_OPTO_OPTOREG_HPP | |
27 | |
0 | 28 //------------------------------OptoReg---------------------------------------- |
29 // We eventually need Registers for the Real World. Registers are essentially | |
30 // non-SSA names. A Register is represented as a number. Non-regular values | |
31 // (e.g., Control, Memory, I/O) use the Special register. The actual machine | |
32 // registers (as described in the ADL file for a machine) start at zero. | |
33 // Stack-slots (spill locations) start at the nest Chunk past the last machine | |
34 // register. | |
35 // | |
36 // Note that stack spill-slots are treated as a very large register set. | |
37 // They have all the correct properties for a Register: not aliased (unique | |
38 // named). There is some simple mapping from a stack-slot register number | |
39 // to the actual location on the stack; this mapping depends on the calling | |
40 // conventions and is described in the ADL. | |
41 // | |
42 // Note that Name is not enum. C++ standard defines that the range of enum | |
43 // is the range of smallest bit-field that can represent all enumerators | |
44 // declared in the enum. The result of assigning a value to enum is undefined | |
45 // if the value is outside the enumeration's valid range. OptoReg::Name is | |
46 // typedef'ed as int, because it needs to be able to represent spill-slots. | |
47 // | |
48 class OptoReg VALUE_OBJ_CLASS_SPEC { | |
49 | |
50 friend class C2Compiler; | |
51 public: | |
52 typedef int Name; | |
53 enum { | |
54 // Chunk 0 | |
55 Physical = AdlcVMDeps::Physical, // Start of physical regs | |
56 // A few oddballs at the edge of the world | |
57 Special = -2, // All special (not allocated) values | |
58 Bad = -1 // Not a register | |
59 }; | |
60 | |
61 private: | |
62 | |
63 static const VMReg opto2vm[REG_COUNT]; | |
64 static Name vm2opto[ConcreteRegisterImpl::number_of_registers]; | |
65 | |
66 public: | |
67 | |
68 // Stack pointer register | |
69 static OptoReg::Name c_frame_pointer; | |
70 | |
71 | |
72 | |
73 // Increment a register number. As in: | |
74 // "for ( OptoReg::Name i; i=Control; i = add(i,1) ) ..." | |
75 static Name add( Name x, int y ) { return Name(x+y); } | |
76 | |
77 // (We would like to have an operator+ for RegName, but it is not | |
78 // a class, so this would be illegal in C++.) | |
79 | |
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80 static void dump(int, outputStream *st = tty); |
0 | 81 |
82 // Get the stack slot number of an OptoReg::Name | |
83 static unsigned int reg2stack( OptoReg::Name r) { | |
84 assert( r >= stack0(), " must be"); | |
85 return r - stack0(); | |
86 } | |
87 | |
88 // convert a stack slot number into an OptoReg::Name | |
89 static OptoReg::Name stack2reg( int idx) { | |
90 return Name(stack0() + idx); | |
91 } | |
92 | |
93 static bool is_stack(Name n) { | |
94 return n >= stack0(); | |
95 } | |
96 | |
97 static bool is_valid(Name n) { | |
98 return (n != Bad); | |
99 } | |
100 | |
101 static bool is_reg(Name n) { | |
102 return is_valid(n) && !is_stack(n); | |
103 } | |
104 | |
105 static VMReg as_VMReg(OptoReg::Name n) { | |
106 if (is_reg(n)) { | |
107 // Must use table, it'd be nice if Bad was indexable... | |
108 return opto2vm[n]; | |
109 } else { | |
110 assert(!is_stack(n), "must un warp"); | |
111 return VMRegImpl::Bad(); | |
112 } | |
113 } | |
114 | |
115 // Can un-warp a stack slot or convert a register or Bad | |
116 static VMReg as_VMReg(OptoReg::Name n, int frame_size, int arg_count) { | |
117 if (is_reg(n)) { | |
118 // Must use table, it'd be nice if Bad was indexable... | |
119 return opto2vm[n]; | |
120 } else if (is_stack(n)) { | |
121 int stack_slot = reg2stack(n); | |
122 if (stack_slot < arg_count) { | |
123 return VMRegImpl::stack2reg(stack_slot + frame_size); | |
124 } | |
125 return VMRegImpl::stack2reg(stack_slot - arg_count); | |
126 // return return VMRegImpl::stack2reg(reg2stack(OptoReg::add(n, -arg_count))); | |
127 } else { | |
128 return VMRegImpl::Bad(); | |
129 } | |
130 } | |
131 | |
132 static OptoReg::Name as_OptoReg(VMReg r) { | |
133 if (r->is_stack()) { | |
134 assert(false, "must warp"); | |
135 return stack2reg(r->reg2stack()); | |
136 } else if (r->is_valid()) { | |
137 // Must use table, it'd be nice if Bad was indexable... | |
138 return vm2opto[r->value()]; | |
139 } else { | |
140 return Bad; | |
141 } | |
142 } | |
143 | |
144 static OptoReg::Name stack0() { | |
145 return VMRegImpl::stack0->value(); | |
146 } | |
147 | |
148 static const char* regname(OptoReg::Name n) { | |
149 return as_VMReg(n)->name(); | |
150 } | |
151 | |
152 }; | |
153 | |
154 //---------------------------OptoRegPair------------------------------------------- | |
155 // Pairs of 32-bit registers for the allocator. | |
156 // This is a very similar class to VMRegPair. C2 only interfaces with VMRegPair | |
157 // via the calling convention code which is shared between the compilers. | |
158 // Since C2 uses OptoRegs for register allocation it is more efficient to use | |
159 // VMRegPair internally for nodes that can contain a pair of OptoRegs rather | |
160 // than use VMRegPair and continually be converting back and forth. So normally | |
161 // C2 will take in a VMRegPair from the calling convention code and immediately | |
162 // convert them to an OptoRegPair and stay in the OptoReg world. The only over | |
163 // conversion between OptoRegs and VMRegs is for debug info and oopMaps. This | |
164 // is not a high bandwidth spot and so it is not an issue. | |
165 // Note that onde other consequence of staying in the OptoReg world with OptoRegPairs | |
166 // is that there are "physical" OptoRegs that are not representable in the VMReg | |
167 // world, notably flags. [ But by design there is "space" in the VMReg world | |
168 // for such registers they just may not be concrete ]. So if we were to use VMRegPair | |
169 // then the VMReg world would have to have a representation for these registers | |
170 // so that a OptoReg->VMReg->OptoReg would reproduce ther original OptoReg. As it | |
171 // stands if you convert a flag (condition code) to a VMReg you will get VMRegImpl::Bad | |
172 // and converting that will return OptoReg::Bad losing the identity of the OptoReg. | |
173 | |
174 class OptoRegPair { | |
3939 | 175 friend class VMStructs; |
0 | 176 private: |
177 short _second; | |
178 short _first; | |
179 public: | |
180 void set_bad ( ) { _second = OptoReg::Bad; _first = OptoReg::Bad; } | |
181 void set1 ( OptoReg::Name n ) { _second = OptoReg::Bad; _first = n; } | |
182 void set2 ( OptoReg::Name n ) { _second = n + 1; _first = n; } | |
183 void set_pair( OptoReg::Name second, OptoReg::Name first ) { _second= second; _first= first; } | |
184 void set_ptr ( OptoReg::Name ptr ) { | |
185 #ifdef _LP64 | |
186 _second = ptr+1; | |
187 #else | |
188 _second = OptoReg::Bad; | |
189 #endif | |
190 _first = ptr; | |
191 } | |
192 | |
193 OptoReg::Name second() const { return _second; } | |
194 OptoReg::Name first() const { return _first; } | |
195 OptoRegPair(OptoReg::Name second, OptoReg::Name first) { _second = second; _first = first; } | |
196 OptoRegPair(OptoReg::Name f) { _second = OptoReg::Bad; _first = f; } | |
197 OptoRegPair() { _second = OptoReg::Bad; _first = OptoReg::Bad; } | |
198 }; | |
1972 | 199 |
200 #endif // SHARE_VM_OPTO_OPTOREG_HPP |