Mercurial > hg > graal-compiler
annotate src/share/vm/opto/regmask.cpp @ 2142:8012aa3ccede
4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed
author | never |
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date | Thu, 13 Jan 2011 22:15:41 -0800 |
parents | f95d63e2154a |
children | b92c45f2bc75 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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 * | |
1552
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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 #include "precompiled.hpp" |
26 #include "opto/compile.hpp" | |
27 #include "opto/regmask.hpp" | |
28 #ifdef TARGET_ARCH_MODEL_x86_32 | |
29 # include "adfiles/ad_x86_32.hpp" | |
30 #endif | |
31 #ifdef TARGET_ARCH_MODEL_x86_64 | |
32 # include "adfiles/ad_x86_64.hpp" | |
33 #endif | |
34 #ifdef TARGET_ARCH_MODEL_sparc | |
35 # include "adfiles/ad_sparc.hpp" | |
36 #endif | |
37 #ifdef TARGET_ARCH_MODEL_zero | |
38 # include "adfiles/ad_zero.hpp" | |
39 #endif | |
0 | 40 |
41 #define RM_SIZE _RM_SIZE /* a constant private to the class RegMask */ | |
42 | |
43 //-------------Non-zero bit search methods used by RegMask--------------------- | |
44 // Find lowest 1, or return 32 if empty | |
45 int find_lowest_bit( uint32 mask ) { | |
46 int n = 0; | |
47 if( (mask & 0xffff) == 0 ) { | |
48 mask >>= 16; | |
49 n += 16; | |
50 } | |
51 if( (mask & 0xff) == 0 ) { | |
52 mask >>= 8; | |
53 n += 8; | |
54 } | |
55 if( (mask & 0xf) == 0 ) { | |
56 mask >>= 4; | |
57 n += 4; | |
58 } | |
59 if( (mask & 0x3) == 0 ) { | |
60 mask >>= 2; | |
61 n += 2; | |
62 } | |
63 if( (mask & 0x1) == 0 ) { | |
64 mask >>= 1; | |
65 n += 1; | |
66 } | |
67 if( mask == 0 ) { | |
68 n = 32; | |
69 } | |
70 return n; | |
71 } | |
72 | |
73 // Find highest 1, or return 32 if empty | |
74 int find_hihghest_bit( uint32 mask ) { | |
75 int n = 0; | |
76 if( mask > 0xffff ) { | |
77 mask >>= 16; | |
78 n += 16; | |
79 } | |
80 if( mask > 0xff ) { | |
81 mask >>= 8; | |
82 n += 8; | |
83 } | |
84 if( mask > 0xf ) { | |
85 mask >>= 4; | |
86 n += 4; | |
87 } | |
88 if( mask > 0x3 ) { | |
89 mask >>= 2; | |
90 n += 2; | |
91 } | |
92 if( mask > 0x1 ) { | |
93 mask >>= 1; | |
94 n += 1; | |
95 } | |
96 if( mask == 0 ) { | |
97 n = 32; | |
98 } | |
99 return n; | |
100 } | |
101 | |
102 //------------------------------dump------------------------------------------- | |
103 | |
104 #ifndef PRODUCT | |
105 void OptoReg::dump( int r ) { | |
106 switch( r ) { | |
107 case Special: tty->print("r---"); break; | |
108 case Bad: tty->print("rBAD"); break; | |
109 default: | |
110 if( r < _last_Mach_Reg ) tty->print(Matcher::regName[r]); | |
111 else tty->print("rS%d",r); | |
112 break; | |
113 } | |
114 } | |
115 #endif | |
116 | |
117 | |
118 //============================================================================= | |
119 const RegMask RegMask::Empty( | |
120 # define BODY(I) 0, | |
121 FORALL_BODY | |
122 # undef BODY | |
123 0 | |
124 ); | |
125 | |
126 //------------------------------find_first_pair-------------------------------- | |
127 // Find the lowest-numbered register pair in the mask. Return the | |
128 // HIGHEST register number in the pair, or BAD if no pairs. | |
129 OptoReg::Name RegMask::find_first_pair() const { | |
130 VerifyPairs(); | |
131 for( int i = 0; i < RM_SIZE; i++ ) { | |
132 if( _A[i] ) { // Found some bits | |
133 int bit = _A[i] & -_A[i]; // Extract low bit | |
134 // Convert to bit number, return hi bit in pair | |
135 return OptoReg::Name((i<<_LogWordBits)+find_lowest_bit(bit)+1); | |
136 } | |
137 } | |
138 return OptoReg::Bad; | |
139 } | |
140 | |
141 //------------------------------ClearToPairs----------------------------------- | |
142 // Clear out partial bits; leave only bit pairs | |
143 void RegMask::ClearToPairs() { | |
144 for( int i = 0; i < RM_SIZE; i++ ) { | |
145 int bits = _A[i]; | |
146 bits &= ((bits & 0x55555555)<<1); // 1 hi-bit set for each pair | |
147 bits |= (bits>>1); // Smear 1 hi-bit into a pair | |
148 _A[i] = bits; | |
149 } | |
150 VerifyPairs(); | |
151 } | |
152 | |
153 //------------------------------SmearToPairs----------------------------------- | |
154 // Smear out partial bits; leave only bit pairs | |
155 void RegMask::SmearToPairs() { | |
156 for( int i = 0; i < RM_SIZE; i++ ) { | |
157 int bits = _A[i]; | |
158 bits |= ((bits & 0x55555555)<<1); // Smear lo bit hi per pair | |
159 bits |= ((bits & 0xAAAAAAAA)>>1); // Smear hi bit lo per pair | |
160 _A[i] = bits; | |
161 } | |
162 VerifyPairs(); | |
163 } | |
164 | |
165 //------------------------------is_aligned_pairs------------------------------- | |
166 bool RegMask::is_aligned_Pairs() const { | |
167 // Assert that the register mask contains only bit pairs. | |
168 for( int i = 0; i < RM_SIZE; i++ ) { | |
169 int bits = _A[i]; | |
170 while( bits ) { // Check bits for pairing | |
171 int bit = bits & -bits; // Extract low bit | |
172 // Low bit is not odd means its mis-aligned. | |
173 if( (bit & 0x55555555) == 0 ) return false; | |
174 bits -= bit; // Remove bit from mask | |
175 // Check for aligned adjacent bit | |
176 if( (bits & (bit<<1)) == 0 ) return false; | |
177 bits -= (bit<<1); // Remove other halve of pair | |
178 } | |
179 } | |
180 return true; | |
181 } | |
182 | |
183 //------------------------------is_bound1-------------------------------------- | |
184 // Return TRUE if the mask contains a single bit | |
185 int RegMask::is_bound1() const { | |
186 if( is_AllStack() ) return false; | |
187 int bit = -1; // Set to hold the one bit allowed | |
188 for( int i = 0; i < RM_SIZE; i++ ) { | |
189 if( _A[i] ) { // Found some bits | |
190 if( bit != -1 ) return false; // Already had bits, so fail | |
191 bit = _A[i] & -_A[i]; // Extract 1 bit from mask | |
192 if( bit != _A[i] ) return false; // Found many bits, so fail | |
193 } | |
194 } | |
195 // True for both the empty mask and for a single bit | |
196 return true; | |
197 } | |
198 | |
199 //------------------------------is_bound2-------------------------------------- | |
200 // Return TRUE if the mask contains an adjacent pair of bits and no other bits. | |
201 int RegMask::is_bound2() const { | |
202 if( is_AllStack() ) return false; | |
203 | |
204 int bit = -1; // Set to hold the one bit allowed | |
205 for( int i = 0; i < RM_SIZE; i++ ) { | |
206 if( _A[i] ) { // Found some bits | |
207 if( bit != -1 ) return false; // Already had bits, so fail | |
208 bit = _A[i] & -(_A[i]); // Extract 1 bit from mask | |
209 if( (bit << 1) != 0 ) { // Bit pair stays in same word? | |
210 if( (bit | (bit<<1)) != _A[i] ) | |
211 return false; // Require adjacent bit pair and no more bits | |
212 } else { // Else its a split-pair case | |
213 if( bit != _A[i] ) return false; // Found many bits, so fail | |
214 i++; // Skip iteration forward | |
215 if( _A[i] != 1 ) return false; // Require 1 lo bit in next word | |
216 } | |
217 } | |
218 } | |
219 // True for both the empty mask and for a bit pair | |
220 return true; | |
221 } | |
222 | |
223 //------------------------------is_UP------------------------------------------ | |
224 // UP means register only, Register plus stack, or stack only is DOWN | |
225 bool RegMask::is_UP() const { | |
226 // Quick common case check for DOWN (any stack slot is legal) | |
227 if( is_AllStack() ) | |
228 return false; | |
229 // Slower check for any stack bits set (also DOWN) | |
230 if( overlap(Matcher::STACK_ONLY_mask) ) | |
231 return false; | |
232 // Not DOWN, so must be UP | |
233 return true; | |
234 } | |
235 | |
236 //------------------------------Size------------------------------------------- | |
237 // Compute size of register mask in bits | |
238 uint RegMask::Size() const { | |
239 extern uint8 bitsInByte[256]; | |
240 uint sum = 0; | |
241 for( int i = 0; i < RM_SIZE; i++ ) | |
242 sum += | |
243 bitsInByte[(_A[i]>>24) & 0xff] + | |
244 bitsInByte[(_A[i]>>16) & 0xff] + | |
245 bitsInByte[(_A[i]>> 8) & 0xff] + | |
246 bitsInByte[ _A[i] & 0xff]; | |
247 return sum; | |
248 } | |
249 | |
250 #ifndef PRODUCT | |
251 //------------------------------print------------------------------------------ | |
252 void RegMask::dump( ) const { | |
253 tty->print("["); | |
254 RegMask rm = *this; // Structure copy into local temp | |
255 | |
256 OptoReg::Name start = rm.find_first_elem(); // Get a register | |
257 if( OptoReg::is_valid(start) ) { // Check for empty mask | |
258 rm.Remove(start); // Yank from mask | |
259 OptoReg::dump(start); // Print register | |
260 OptoReg::Name last = start; | |
261 | |
262 // Now I have printed an initial register. | |
263 // Print adjacent registers as "rX-rZ" instead of "rX,rY,rZ". | |
264 // Begin looping over the remaining registers. | |
265 while( 1 ) { // | |
266 OptoReg::Name reg = rm.find_first_elem(); // Get a register | |
267 if( !OptoReg::is_valid(reg) ) | |
268 break; // Empty mask, end loop | |
269 rm.Remove(reg); // Yank from mask | |
270 | |
271 if( last+1 == reg ) { // See if they are adjacent | |
272 // Adjacent registers just collect into long runs, no printing. | |
273 last = reg; | |
274 } else { // Ending some kind of run | |
275 if( start == last ) { // 1-register run; no special printing | |
276 } else if( start+1 == last ) { | |
277 tty->print(","); // 2-register run; print as "rX,rY" | |
278 OptoReg::dump(last); | |
279 } else { // Multi-register run; print as "rX-rZ" | |
280 tty->print("-"); | |
281 OptoReg::dump(last); | |
282 } | |
283 tty->print(","); // Seperate start of new run | |
284 start = last = reg; // Start a new register run | |
285 OptoReg::dump(start); // Print register | |
286 } // End of if ending a register run or not | |
287 } // End of while regmask not empty | |
288 | |
289 if( start == last ) { // 1-register run; no special printing | |
290 } else if( start+1 == last ) { | |
291 tty->print(","); // 2-register run; print as "rX,rY" | |
292 OptoReg::dump(last); | |
293 } else { // Multi-register run; print as "rX-rZ" | |
294 tty->print("-"); | |
295 OptoReg::dump(last); | |
296 } | |
297 if( rm.is_AllStack() ) tty->print("..."); | |
298 } | |
299 tty->print("]"); | |
300 } | |
301 #endif |