Mercurial > hg > truffle
annotate src/share/vm/opto/regmask.hpp @ 1604:b918d354830a
6960865: ldc of unloaded class throws an assert in ciTypeFlow
Summary: Support java_mirror for unloaded klasses, arrays as well as instances. Simplify ciTypeFlow by removing unused path.
Reviewed-by: kvn
author | jrose |
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date | Sat, 12 Jun 2010 22:53:43 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2006, 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 | |
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7 * published by the Free Software Foundation. | |
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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 | |
25 // Some fun naming (textual) substitutions: | |
26 // | |
27 // RegMask::get_low_elem() ==> RegMask::find_first_elem() | |
28 // RegMask::Special ==> RegMask::Empty | |
29 // RegMask::_flags ==> RegMask::is_AllStack() | |
30 // RegMask::operator<<=() ==> RegMask::Insert() | |
31 // RegMask::operator>>=() ==> RegMask::Remove() | |
32 // RegMask::Union() ==> RegMask::OR | |
33 // RegMask::Inter() ==> RegMask::AND | |
34 // | |
35 // OptoRegister::RegName ==> OptoReg::Name | |
36 // | |
37 // OptoReg::stack0() ==> _last_Mach_Reg or ZERO in core version | |
38 // | |
39 // numregs in chaitin ==> proper degree in chaitin | |
40 | |
41 //-------------Non-zero bit search methods used by RegMask--------------------- | |
42 // Find lowest 1, or return 32 if empty | |
43 int find_lowest_bit( uint32 mask ); | |
44 // Find highest 1, or return 32 if empty | |
45 int find_hihghest_bit( uint32 mask ); | |
46 | |
47 //------------------------------RegMask---------------------------------------- | |
48 // The ADL file describes how to print the machine-specific registers, as well | |
49 // as any notion of register classes. We provide a register mask, which is | |
50 // just a collection of Register numbers. | |
51 | |
52 // The ADLC defines 2 macros, RM_SIZE and FORALL_BODY. | |
53 // RM_SIZE is the size of a register mask in words. | |
54 // FORALL_BODY replicates a BODY macro once per word in the register mask. | |
55 // The usage is somewhat clumsy and limited to the regmask.[h,c]pp files. | |
56 // However, it means the ADLC can redefine the unroll macro and all loops | |
57 // over register masks will be unrolled by the correct amount. | |
58 | |
59 class RegMask VALUE_OBJ_CLASS_SPEC { | |
60 union { | |
61 double _dummy_force_double_alignment[RM_SIZE>>1]; | |
62 // Array of Register Mask bits. This array is large enough to cover | |
63 // all the machine registers and all parameters that need to be passed | |
64 // on the stack (stack registers) up to some interesting limit. Methods | |
65 // that need more parameters will NOT be compiled. On Intel, the limit | |
66 // is something like 90+ parameters. | |
67 int _A[RM_SIZE]; | |
68 }; | |
69 | |
70 enum { | |
71 _WordBits = BitsPerInt, | |
72 _LogWordBits = LogBitsPerInt, | |
73 _RM_SIZE = RM_SIZE // local constant, imported, then hidden by #undef | |
74 }; | |
75 | |
76 public: | |
77 enum { CHUNK_SIZE = RM_SIZE*_WordBits }; | |
78 | |
79 // SlotsPerLong is 2, since slots are 32 bits and longs are 64 bits. | |
80 // Also, consider the maximum alignment size for a normally allocated | |
81 // value. Since we allocate register pairs but not register quads (at | |
82 // present), this alignment is SlotsPerLong (== 2). A normally | |
83 // aligned allocated register is either a single register, or a pair | |
84 // of adjacent registers, the lower-numbered being even. | |
85 // See also is_aligned_Pairs() below, and the padding added before | |
86 // Matcher::_new_SP to keep allocated pairs aligned properly. | |
87 // If we ever go to quad-word allocations, SlotsPerQuad will become | |
88 // the controlling alignment constraint. Note that this alignment | |
89 // requirement is internal to the allocator, and independent of any | |
90 // particular platform. | |
91 enum { SlotsPerLong = 2 }; | |
92 | |
93 // A constructor only used by the ADLC output. All mask fields are filled | |
94 // in directly. Calls to this look something like RM(1,2,3,4); | |
95 RegMask( | |
96 # define BODY(I) int a##I, | |
97 FORALL_BODY | |
98 # undef BODY | |
99 int dummy = 0 ) { | |
100 # define BODY(I) _A[I] = a##I; | |
101 FORALL_BODY | |
102 # undef BODY | |
103 } | |
104 | |
105 // Handy copying constructor | |
106 RegMask( RegMask *rm ) { | |
107 # define BODY(I) _A[I] = rm->_A[I]; | |
108 FORALL_BODY | |
109 # undef BODY | |
110 } | |
111 | |
112 // Construct an empty mask | |
113 RegMask( ) { Clear(); } | |
114 | |
115 // Construct a mask with a single bit | |
116 RegMask( OptoReg::Name reg ) { Clear(); Insert(reg); } | |
117 | |
118 // Check for register being in mask | |
119 int Member( OptoReg::Name reg ) const { | |
120 assert( reg < CHUNK_SIZE, "" ); | |
121 return _A[reg>>_LogWordBits] & (1<<(reg&(_WordBits-1))); | |
122 } | |
123 | |
124 // The last bit in the register mask indicates that the mask should repeat | |
125 // indefinitely with ONE bits. Returns TRUE if mask is infinite or | |
126 // unbounded in size. Returns FALSE if mask is finite size. | |
127 int is_AllStack() const { return _A[RM_SIZE-1] >> (_WordBits-1); } | |
128 | |
129 // Work around an -xO3 optimization problme in WS6U1. The old way: | |
130 // void set_AllStack() { _A[RM_SIZE-1] |= (1<<(_WordBits-1)); } | |
131 // will cause _A[RM_SIZE-1] to be clobbered, not updated when set_AllStack() | |
132 // follows an Insert() loop, like the one found in init_spill_mask(). Using | |
133 // Insert() instead works because the index into _A in computed instead of | |
134 // constant. See bug 4665841. | |
135 void set_AllStack() { Insert(OptoReg::Name(CHUNK_SIZE-1)); } | |
136 | |
137 // Test for being a not-empty mask. | |
138 int is_NotEmpty( ) const { | |
139 int tmp = 0; | |
140 # define BODY(I) tmp |= _A[I]; | |
141 FORALL_BODY | |
142 # undef BODY | |
143 return tmp; | |
144 } | |
145 | |
146 // Find lowest-numbered register from mask, or BAD if mask is empty. | |
147 OptoReg::Name find_first_elem() const { | |
148 int base, bits; | |
149 # define BODY(I) if( (bits = _A[I]) != 0 ) base = I<<_LogWordBits; else | |
150 FORALL_BODY | |
151 # undef BODY | |
152 { base = OptoReg::Bad; bits = 1<<0; } | |
153 return OptoReg::Name(base + find_lowest_bit(bits)); | |
154 } | |
155 // Get highest-numbered register from mask, or BAD if mask is empty. | |
156 OptoReg::Name find_last_elem() const { | |
157 int base, bits; | |
158 # define BODY(I) if( (bits = _A[RM_SIZE-1-I]) != 0 ) base = (RM_SIZE-1-I)<<_LogWordBits; else | |
159 FORALL_BODY | |
160 # undef BODY | |
161 { base = OptoReg::Bad; bits = 1<<0; } | |
162 return OptoReg::Name(base + find_hihghest_bit(bits)); | |
163 } | |
164 | |
165 // Find the lowest-numbered register pair in the mask. Return the | |
166 // HIGHEST register number in the pair, or BAD if no pairs. | |
167 // Assert that the mask contains only bit pairs. | |
168 OptoReg::Name find_first_pair() const; | |
169 | |
170 // Clear out partial bits; leave only aligned adjacent bit pairs. | |
171 void ClearToPairs(); | |
172 // Smear out partial bits; leave only aligned adjacent bit pairs. | |
173 void SmearToPairs(); | |
174 // Verify that the mask contains only aligned adjacent bit pairs | |
175 void VerifyPairs() const { assert( is_aligned_Pairs(), "mask is not aligned, adjacent pairs" ); } | |
176 // Test that the mask contains only aligned adjacent bit pairs | |
177 bool is_aligned_Pairs() const; | |
178 | |
179 // mask is a pair of misaligned registers | |
180 bool is_misaligned_Pair() const { return Size()==2 && !is_aligned_Pairs();} | |
181 // Test for single register | |
182 int is_bound1() const; | |
183 // Test for a single adjacent pair | |
184 int is_bound2() const; | |
185 | |
186 // Fast overlap test. Non-zero if any registers in common. | |
187 int overlap( const RegMask &rm ) const { | |
188 return | |
189 # define BODY(I) (_A[I] & rm._A[I]) | | |
190 FORALL_BODY | |
191 # undef BODY | |
192 0 ; | |
193 } | |
194 | |
195 // Special test for register pressure based splitting | |
196 // UP means register only, Register plus stack, or stack only is DOWN | |
197 bool is_UP() const; | |
198 | |
199 // Clear a register mask | |
200 void Clear( ) { | |
201 # define BODY(I) _A[I] = 0; | |
202 FORALL_BODY | |
203 # undef BODY | |
204 } | |
205 | |
206 // Fill a register mask with 1's | |
207 void Set_All( ) { | |
208 # define BODY(I) _A[I] = -1; | |
209 FORALL_BODY | |
210 # undef BODY | |
211 } | |
212 | |
213 // Insert register into mask | |
214 void Insert( OptoReg::Name reg ) { | |
215 assert( reg < CHUNK_SIZE, "" ); | |
216 _A[reg>>_LogWordBits] |= (1<<(reg&(_WordBits-1))); | |
217 } | |
218 | |
219 // Remove register from mask | |
220 void Remove( OptoReg::Name reg ) { | |
221 assert( reg < CHUNK_SIZE, "" ); | |
222 _A[reg>>_LogWordBits] &= ~(1<<(reg&(_WordBits-1))); | |
223 } | |
224 | |
225 // OR 'rm' into 'this' | |
226 void OR( const RegMask &rm ) { | |
227 # define BODY(I) this->_A[I] |= rm._A[I]; | |
228 FORALL_BODY | |
229 # undef BODY | |
230 } | |
231 | |
232 // AND 'rm' into 'this' | |
233 void AND( const RegMask &rm ) { | |
234 # define BODY(I) this->_A[I] &= rm._A[I]; | |
235 FORALL_BODY | |
236 # undef BODY | |
237 } | |
238 | |
239 // Subtract 'rm' from 'this' | |
240 void SUBTRACT( const RegMask &rm ) { | |
241 # define BODY(I) _A[I] &= ~rm._A[I]; | |
242 FORALL_BODY | |
243 # undef BODY | |
244 } | |
245 | |
246 // Compute size of register mask: number of bits | |
247 uint Size() const; | |
248 | |
249 #ifndef PRODUCT | |
250 void print() const { dump(); } | |
251 void dump() const; // Print a mask | |
252 #endif | |
253 | |
254 static const RegMask Empty; // Common empty mask | |
255 | |
256 static bool can_represent(OptoReg::Name reg) { | |
257 // NOTE: -1 in computation reflects the usage of the last | |
258 // bit of the regmask as an infinite stack flag. | |
259 return (int)reg < (int)(CHUNK_SIZE-1); | |
260 } | |
261 }; | |
262 | |
263 // Do not use this constant directly in client code! | |
264 #undef RM_SIZE |