Mercurial > hg > truffle
annotate src/share/vm/opto/buildOopMap.cpp @ 17697:0f95765ebd35
8035283: Second phase of branch shortening doesn't account for loop alignment
Summary: added missing check for loop padding case.
Reviewed-by: kvn, jrose
author | poonam |
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date | Fri, 28 Feb 2014 02:43:16 -0800 |
parents | 55fb97c4c58d |
children | 4ca6dc0799b6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2013, 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 #include "precompiled.hpp" |
26 #include "compiler/oopMap.hpp" | |
27 #include "opto/addnode.hpp" | |
28 #include "opto/callnode.hpp" | |
29 #include "opto/compile.hpp" | |
30 #include "opto/machnode.hpp" | |
31 #include "opto/matcher.hpp" | |
32 #include "opto/phase.hpp" | |
33 #include "opto/regalloc.hpp" | |
34 #include "opto/rootnode.hpp" | |
35 #ifdef TARGET_ARCH_x86 | |
36 # include "vmreg_x86.inline.hpp" | |
37 #endif | |
38 #ifdef TARGET_ARCH_sparc | |
39 # include "vmreg_sparc.inline.hpp" | |
40 #endif | |
41 #ifdef TARGET_ARCH_zero | |
42 # include "vmreg_zero.inline.hpp" | |
43 #endif | |
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44 #ifdef TARGET_ARCH_arm |
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45 # include "vmreg_arm.inline.hpp" |
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46 #endif |
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47 #ifdef TARGET_ARCH_ppc |
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48 # include "vmreg_ppc.inline.hpp" |
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49 #endif |
0 | 50 |
51 // The functions in this file builds OopMaps after all scheduling is done. | |
52 // | |
53 // OopMaps contain a list of all registers and stack-slots containing oops (so | |
54 // they can be updated by GC). OopMaps also contain a list of derived-pointer | |
55 // base-pointer pairs. When the base is moved, the derived pointer moves to | |
56 // follow it. Finally, any registers holding callee-save values are also | |
57 // recorded. These might contain oops, but only the caller knows. | |
58 // | |
59 // BuildOopMaps implements a simple forward reaching-defs solution. At each | |
60 // GC point we'll have the reaching-def Nodes. If the reaching Nodes are | |
61 // typed as pointers (no offset), then they are oops. Pointers+offsets are | |
62 // derived pointers, and bases can be found from them. Finally, we'll also | |
63 // track reaching callee-save values. Note that a copy of a callee-save value | |
64 // "kills" it's source, so that only 1 copy of a callee-save value is alive at | |
65 // a time. | |
66 // | |
67 // We run a simple bitvector liveness pass to help trim out dead oops. Due to | |
68 // irreducible loops, we can have a reaching def of an oop that only reaches | |
69 // along one path and no way to know if it's valid or not on the other path. | |
70 // The bitvectors are quite dense and the liveness pass is fast. | |
71 // | |
72 // At GC points, we consult this information to build OopMaps. All reaching | |
73 // defs typed as oops are added to the OopMap. Only 1 instance of a | |
74 // callee-save register can be recorded. For derived pointers, we'll have to | |
75 // find and record the register holding the base. | |
76 // | |
77 // The reaching def's is a simple 1-pass worklist approach. I tried a clever | |
78 // breadth-first approach but it was worse (showed O(n^2) in the | |
79 // pick-next-block code). | |
80 // | |
605 | 81 // The relevant data is kept in a struct of arrays (it could just as well be |
0 | 82 // an array of structs, but the struct-of-arrays is generally a little more |
83 // efficient). The arrays are indexed by register number (including | |
84 // stack-slots as registers) and so is bounded by 200 to 300 elements in | |
85 // practice. One array will map to a reaching def Node (or NULL for | |
86 // conflict/dead). The other array will map to a callee-saved register or | |
87 // OptoReg::Bad for not-callee-saved. | |
88 | |
89 | |
90 // Structure to pass around | |
91 struct OopFlow : public ResourceObj { | |
92 short *_callees; // Array mapping register to callee-saved | |
93 Node **_defs; // array mapping register to reaching def | |
94 // or NULL if dead/conflict | |
95 // OopFlow structs, when not being actively modified, describe the _end_ of | |
96 // this block. | |
97 Block *_b; // Block for this struct | |
98 OopFlow *_next; // Next free OopFlow | |
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99 // or NULL if dead/conflict |
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100 Compile* C; |
0 | 101 |
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102 OopFlow( short *callees, Node **defs, Compile* c ) : _callees(callees), _defs(defs), |
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103 _b(NULL), _next(NULL), C(c) { } |
0 | 104 |
105 // Given reaching-defs for this block start, compute it for this block end | |
106 void compute_reach( PhaseRegAlloc *regalloc, int max_reg, Dict *safehash ); | |
107 | |
108 // Merge these two OopFlows into the 'this' pointer. | |
109 void merge( OopFlow *flow, int max_reg ); | |
110 | |
111 // Copy a 'flow' over an existing flow | |
112 void clone( OopFlow *flow, int max_size); | |
113 | |
114 // Make a new OopFlow from scratch | |
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115 static OopFlow *make( Arena *A, int max_size, Compile* C ); |
0 | 116 |
117 // Build an oopmap from the current flow info | |
118 OopMap *build_oop_map( Node *n, int max_reg, PhaseRegAlloc *regalloc, int* live ); | |
119 }; | |
120 | |
121 // Given reaching-defs for this block start, compute it for this block end | |
122 void OopFlow::compute_reach( PhaseRegAlloc *regalloc, int max_reg, Dict *safehash ) { | |
123 | |
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124 for( uint i=0; i<_b->number_of_nodes(); i++ ) { |
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125 Node *n = _b->get_node(i); |
0 | 126 |
127 if( n->jvms() ) { // Build an OopMap here? | |
128 JVMState *jvms = n->jvms(); | |
129 // no map needed for leaf calls | |
130 if( n->is_MachSafePoint() && !n->is_MachCallLeaf() ) { | |
131 int *live = (int*) (*safehash)[n]; | |
132 assert( live, "must find live" ); | |
133 n->as_MachSafePoint()->set_oop_map( build_oop_map(n,max_reg,regalloc, live) ); | |
134 } | |
135 } | |
136 | |
137 // Assign new reaching def's. | |
138 // Note that I padded the _defs and _callees arrays so it's legal | |
139 // to index at _defs[OptoReg::Bad]. | |
140 OptoReg::Name first = regalloc->get_reg_first(n); | |
141 OptoReg::Name second = regalloc->get_reg_second(n); | |
142 _defs[first] = n; | |
143 _defs[second] = n; | |
144 | |
145 // Pass callee-save info around copies | |
146 int idx = n->is_Copy(); | |
147 if( idx ) { // Copies move callee-save info | |
148 OptoReg::Name old_first = regalloc->get_reg_first(n->in(idx)); | |
149 OptoReg::Name old_second = regalloc->get_reg_second(n->in(idx)); | |
150 int tmp_first = _callees[old_first]; | |
151 int tmp_second = _callees[old_second]; | |
152 _callees[old_first] = OptoReg::Bad; // callee-save is moved, dead in old location | |
153 _callees[old_second] = OptoReg::Bad; | |
154 _callees[first] = tmp_first; | |
155 _callees[second] = tmp_second; | |
156 } else if( n->is_Phi() ) { // Phis do not mod callee-saves | |
157 assert( _callees[first] == _callees[regalloc->get_reg_first(n->in(1))], "" ); | |
158 assert( _callees[second] == _callees[regalloc->get_reg_second(n->in(1))], "" ); | |
159 assert( _callees[first] == _callees[regalloc->get_reg_first(n->in(n->req()-1))], "" ); | |
160 assert( _callees[second] == _callees[regalloc->get_reg_second(n->in(n->req()-1))], "" ); | |
161 } else { | |
162 _callees[first] = OptoReg::Bad; // No longer holding a callee-save value | |
163 _callees[second] = OptoReg::Bad; | |
164 | |
165 // Find base case for callee saves | |
166 if( n->is_Proj() && n->in(0)->is_Start() ) { | |
167 if( OptoReg::is_reg(first) && | |
168 regalloc->_matcher.is_save_on_entry(first) ) | |
169 _callees[first] = first; | |
170 if( OptoReg::is_reg(second) && | |
171 regalloc->_matcher.is_save_on_entry(second) ) | |
172 _callees[second] = second; | |
173 } | |
174 } | |
175 } | |
176 } | |
177 | |
178 // Merge the given flow into the 'this' flow | |
179 void OopFlow::merge( OopFlow *flow, int max_reg ) { | |
180 assert( _b == NULL, "merging into a happy flow" ); | |
181 assert( flow->_b, "this flow is still alive" ); | |
182 assert( flow != this, "no self flow" ); | |
183 | |
184 // Do the merge. If there are any differences, drop to 'bottom' which | |
185 // is OptoReg::Bad or NULL depending. | |
186 for( int i=0; i<max_reg; i++ ) { | |
187 // Merge the callee-save's | |
188 if( _callees[i] != flow->_callees[i] ) | |
189 _callees[i] = OptoReg::Bad; | |
190 // Merge the reaching defs | |
191 if( _defs[i] != flow->_defs[i] ) | |
192 _defs[i] = NULL; | |
193 } | |
194 | |
195 } | |
196 | |
197 void OopFlow::clone( OopFlow *flow, int max_size ) { | |
198 _b = flow->_b; | |
199 memcpy( _callees, flow->_callees, sizeof(short)*max_size); | |
200 memcpy( _defs , flow->_defs , sizeof(Node*)*max_size); | |
201 } | |
202 | |
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203 OopFlow *OopFlow::make( Arena *A, int max_size, Compile* C ) { |
0 | 204 short *callees = NEW_ARENA_ARRAY(A,short,max_size+1); |
205 Node **defs = NEW_ARENA_ARRAY(A,Node*,max_size+1); | |
206 debug_only( memset(defs,0,(max_size+1)*sizeof(Node*)) ); | |
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207 OopFlow *flow = new (A) OopFlow(callees+1, defs+1, C); |
0 | 208 assert( &flow->_callees[OptoReg::Bad] == callees, "Ok to index at OptoReg::Bad" ); |
209 assert( &flow->_defs [OptoReg::Bad] == defs , "Ok to index at OptoReg::Bad" ); | |
210 return flow; | |
211 } | |
212 | |
213 static int get_live_bit( int *live, int reg ) { | |
214 return live[reg>>LogBitsPerInt] & (1<<(reg&(BitsPerInt-1))); } | |
215 static void set_live_bit( int *live, int reg ) { | |
216 live[reg>>LogBitsPerInt] |= (1<<(reg&(BitsPerInt-1))); } | |
217 static void clr_live_bit( int *live, int reg ) { | |
218 live[reg>>LogBitsPerInt] &= ~(1<<(reg&(BitsPerInt-1))); } | |
219 | |
220 // Build an oopmap from the current flow info | |
221 OopMap *OopFlow::build_oop_map( Node *n, int max_reg, PhaseRegAlloc *regalloc, int* live ) { | |
222 int framesize = regalloc->_framesize; | |
223 int max_inarg_slot = OptoReg::reg2stack(regalloc->_matcher._new_SP); | |
224 debug_only( char *dup_check = NEW_RESOURCE_ARRAY(char,OptoReg::stack0()); | |
225 memset(dup_check,0,OptoReg::stack0()) ); | |
226 | |
227 OopMap *omap = new OopMap( framesize, max_inarg_slot ); | |
228 MachCallNode *mcall = n->is_MachCall() ? n->as_MachCall() : NULL; | |
229 JVMState* jvms = n->jvms(); | |
230 | |
231 // For all registers do... | |
232 for( int reg=0; reg<max_reg; reg++ ) { | |
233 if( get_live_bit(live,reg) == 0 ) | |
234 continue; // Ignore if not live | |
235 | |
236 // %%% C2 can use 2 OptoRegs when the physical register is only one 64bit | |
237 // register in that case we'll get an non-concrete register for the second | |
238 // half. We only need to tell the map the register once! | |
239 // | |
240 // However for the moment we disable this change and leave things as they | |
241 // were. | |
242 | |
243 VMReg r = OptoReg::as_VMReg(OptoReg::Name(reg), framesize, max_inarg_slot); | |
244 | |
245 if (false && r->is_reg() && !r->is_concrete()) { | |
246 continue; | |
247 } | |
248 | |
249 // See if dead (no reaching def). | |
250 Node *def = _defs[reg]; // Get reaching def | |
251 assert( def, "since live better have reaching def" ); | |
252 | |
253 // Classify the reaching def as oop, derived, callee-save, dead, or other | |
254 const Type *t = def->bottom_type(); | |
255 if( t->isa_oop_ptr() ) { // Oop or derived? | |
256 assert( !OptoReg::is_valid(_callees[reg]), "oop can't be callee save" ); | |
257 #ifdef _LP64 | |
258 // 64-bit pointers record oop-ishness on 2 aligned adjacent registers. | |
259 // Make sure both are record from the same reaching def, but do not | |
260 // put both into the oopmap. | |
261 if( (reg&1) == 1 ) { // High half of oop-pair? | |
262 assert( _defs[reg-1] == _defs[reg], "both halves from same reaching def" ); | |
263 continue; // Do not record high parts in oopmap | |
264 } | |
265 #endif | |
266 | |
267 // Check for a legal reg name in the oopMap and bailout if it is not. | |
268 if (!omap->legal_vm_reg_name(r)) { | |
269 regalloc->C->record_method_not_compilable("illegal oopMap register name"); | |
270 continue; | |
271 } | |
272 if( t->is_ptr()->_offset == 0 ) { // Not derived? | |
273 if( mcall ) { | |
274 // Outgoing argument GC mask responsibility belongs to the callee, | |
275 // not the caller. Inspect the inputs to the call, to see if | |
276 // this live-range is one of them. | |
277 uint cnt = mcall->tf()->domain()->cnt(); | |
278 uint j; | |
279 for( j = TypeFunc::Parms; j < cnt; j++) | |
280 if( mcall->in(j) == def ) | |
281 break; // reaching def is an argument oop | |
282 if( j < cnt ) // arg oops dont go in GC map | |
283 continue; // Continue on to the next register | |
284 } | |
285 omap->set_oop(r); | |
286 } else { // Else it's derived. | |
287 // Find the base of the derived value. | |
288 uint i; | |
289 // Fast, common case, scan | |
290 for( i = jvms->oopoff(); i < n->req(); i+=2 ) | |
291 if( n->in(i) == def ) break; // Common case | |
292 if( i == n->req() ) { // Missed, try a more generous scan | |
293 // Scan again, but this time peek through copies | |
294 for( i = jvms->oopoff(); i < n->req(); i+=2 ) { | |
295 Node *m = n->in(i); // Get initial derived value | |
296 while( 1 ) { | |
297 Node *d = def; // Get initial reaching def | |
298 while( 1 ) { // Follow copies of reaching def to end | |
299 if( m == d ) goto found; // breaks 3 loops | |
300 int idx = d->is_Copy(); | |
301 if( !idx ) break; | |
302 d = d->in(idx); // Link through copy | |
303 } | |
304 int idx = m->is_Copy(); | |
305 if( !idx ) break; | |
306 m = m->in(idx); | |
307 } | |
308 } | |
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309 guarantee( 0, "must find derived/base pair" ); |
0 | 310 } |
311 found: ; | |
312 Node *base = n->in(i+1); // Base is other half of pair | |
313 int breg = regalloc->get_reg_first(base); | |
314 VMReg b = OptoReg::as_VMReg(OptoReg::Name(breg), framesize, max_inarg_slot); | |
315 | |
316 // I record liveness at safepoints BEFORE I make the inputs | |
317 // live. This is because argument oops are NOT live at a | |
318 // safepoint (or at least they cannot appear in the oopmap). | |
319 // Thus bases of base/derived pairs might not be in the | |
320 // liveness data but they need to appear in the oopmap. | |
321 if( get_live_bit(live,breg) == 0 ) {// Not live? | |
322 // Flag it, so next derived pointer won't re-insert into oopmap | |
323 set_live_bit(live,breg); | |
324 // Already missed our turn? | |
325 if( breg < reg ) { | |
326 if (b->is_stack() || b->is_concrete() || true ) { | |
327 omap->set_oop( b); | |
328 } | |
329 } | |
330 } | |
331 if (b->is_stack() || b->is_concrete() || true ) { | |
332 omap->set_derived_oop( r, b); | |
333 } | |
334 } | |
335 | |
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336 } else if( t->isa_narrowoop() ) { |
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337 assert( !OptoReg::is_valid(_callees[reg]), "oop can't be callee save" ); |
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338 // Check for a legal reg name in the oopMap and bailout if it is not. |
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339 if (!omap->legal_vm_reg_name(r)) { |
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340 regalloc->C->record_method_not_compilable("illegal oopMap register name"); |
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341 continue; |
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342 } |
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343 if( mcall ) { |
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344 // Outgoing argument GC mask responsibility belongs to the callee, |
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345 // not the caller. Inspect the inputs to the call, to see if |
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346 // this live-range is one of them. |
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347 uint cnt = mcall->tf()->domain()->cnt(); |
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348 uint j; |
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349 for( j = TypeFunc::Parms; j < cnt; j++) |
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350 if( mcall->in(j) == def ) |
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351 break; // reaching def is an argument oop |
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352 if( j < cnt ) // arg oops dont go in GC map |
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353 continue; // Continue on to the next register |
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354 } |
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355 omap->set_narrowoop(r); |
0 | 356 } else if( OptoReg::is_valid(_callees[reg])) { // callee-save? |
357 // It's a callee-save value | |
358 assert( dup_check[_callees[reg]]==0, "trying to callee save same reg twice" ); | |
359 debug_only( dup_check[_callees[reg]]=1; ) | |
360 VMReg callee = OptoReg::as_VMReg(OptoReg::Name(_callees[reg])); | |
361 if ( callee->is_concrete() || true ) { | |
362 omap->set_callee_saved( r, callee); | |
363 } | |
364 | |
365 } else { | |
366 // Other - some reaching non-oop value | |
367 omap->set_value( r); | |
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368 #ifdef ASSERT |
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369 if( t->isa_rawptr() && C->cfg()->_raw_oops.member(def) ) { |
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370 def->dump(); |
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371 n->dump(); |
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372 assert(false, "there should be a oop in OopMap instead of a live raw oop at safepoint"); |
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373 } |
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374 #endif |
0 | 375 } |
376 | |
377 } | |
378 | |
379 #ifdef ASSERT | |
380 /* Nice, Intel-only assert | |
381 int cnt_callee_saves=0; | |
382 int reg2 = 0; | |
383 while (OptoReg::is_reg(reg2)) { | |
384 if( dup_check[reg2] != 0) cnt_callee_saves++; | |
385 assert( cnt_callee_saves==3 || cnt_callee_saves==5, "missed some callee-save" ); | |
386 reg2++; | |
387 } | |
388 */ | |
389 #endif | |
390 | |
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391 #ifdef ASSERT |
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392 for( OopMapStream oms1(omap, OopMapValue::derived_oop_value); !oms1.is_done(); oms1.next()) { |
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393 OopMapValue omv1 = oms1.current(); |
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394 bool found = false; |
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395 for( OopMapStream oms2(omap,OopMapValue::oop_value); !oms2.is_done(); oms2.next()) { |
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396 if( omv1.content_reg() == oms2.current().reg() ) { |
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397 found = true; |
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398 break; |
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399 } |
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400 } |
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401 assert( found, "derived with no base in oopmap" ); |
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402 } |
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403 #endif |
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404 |
0 | 405 return omap; |
406 } | |
407 | |
408 // Compute backwards liveness on registers | |
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409 static void do_liveness(PhaseRegAlloc* regalloc, PhaseCFG* cfg, Block_List* worklist, int max_reg_ints, Arena* A, Dict* safehash) { |
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410 int* live = NEW_ARENA_ARRAY(A, int, (cfg->number_of_blocks() + 1) * max_reg_ints); |
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411 int* tmp_live = &live[cfg->number_of_blocks() * max_reg_ints]; |
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412 Node* root = cfg->get_root_node(); |
0 | 413 // On CISC platforms, get the node representing the stack pointer that regalloc |
414 // used for spills | |
415 Node *fp = NodeSentinel; | |
416 if (UseCISCSpill && root->req() > 1) { | |
417 fp = root->in(1)->in(TypeFunc::FramePtr); | |
418 } | |
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419 memset(live, 0, cfg->number_of_blocks() * (max_reg_ints << LogBytesPerInt)); |
0 | 420 // Push preds onto worklist |
12023 | 421 for (uint i = 1; i < root->req(); i++) { |
422 Block* block = cfg->get_block_for_node(root->in(i)); | |
423 worklist->push(block); | |
424 } | |
0 | 425 |
426 // ZKM.jar includes tiny infinite loops which are unreached from below. | |
427 // If we missed any blocks, we'll retry here after pushing all missed | |
428 // blocks on the worklist. Normally this outer loop never trips more | |
429 // than once. | |
12023 | 430 while (1) { |
0 | 431 |
432 while( worklist->size() ) { // Standard worklist algorithm | |
433 Block *b = worklist->rpop(); | |
434 | |
435 // Copy first successor into my tmp_live space | |
436 int s0num = b->_succs[0]->_pre_order; | |
437 int *t = &live[s0num*max_reg_ints]; | |
438 for( int i=0; i<max_reg_ints; i++ ) | |
439 tmp_live[i] = t[i]; | |
440 | |
441 // OR in the remaining live registers | |
442 for( uint j=1; j<b->_num_succs; j++ ) { | |
443 uint sjnum = b->_succs[j]->_pre_order; | |
444 int *t = &live[sjnum*max_reg_ints]; | |
445 for( int i=0; i<max_reg_ints; i++ ) | |
446 tmp_live[i] |= t[i]; | |
447 } | |
448 | |
449 // Now walk tmp_live up the block backwards, computing live | |
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450 for( int k=b->number_of_nodes()-1; k>=0; k-- ) { |
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451 Node *n = b->get_node(k); |
0 | 452 // KILL def'd bits |
453 int first = regalloc->get_reg_first(n); | |
454 int second = regalloc->get_reg_second(n); | |
455 if( OptoReg::is_valid(first) ) clr_live_bit(tmp_live,first); | |
456 if( OptoReg::is_valid(second) ) clr_live_bit(tmp_live,second); | |
457 | |
458 MachNode *m = n->is_Mach() ? n->as_Mach() : NULL; | |
459 | |
460 // Check if m is potentially a CISC alternate instruction (i.e, possibly | |
461 // synthesized by RegAlloc from a conventional instruction and a | |
462 // spilled input) | |
463 bool is_cisc_alternate = false; | |
464 if (UseCISCSpill && m) { | |
465 is_cisc_alternate = m->is_cisc_alternate(); | |
466 } | |
467 | |
468 // GEN use'd bits | |
469 for( uint l=1; l<n->req(); l++ ) { | |
470 Node *def = n->in(l); | |
471 assert(def != 0, "input edge required"); | |
472 int first = regalloc->get_reg_first(def); | |
473 int second = regalloc->get_reg_second(def); | |
474 if( OptoReg::is_valid(first) ) set_live_bit(tmp_live,first); | |
475 if( OptoReg::is_valid(second) ) set_live_bit(tmp_live,second); | |
476 // If we use the stack pointer in a cisc-alternative instruction, | |
477 // check for use as a memory operand. Then reconstruct the RegName | |
478 // for this stack location, and set the appropriate bit in the | |
479 // live vector 4987749. | |
480 if (is_cisc_alternate && def == fp) { | |
481 const TypePtr *adr_type = NULL; | |
482 intptr_t offset; | |
483 const Node* base = m->get_base_and_disp(offset, adr_type); | |
484 if (base == NodeSentinel) { | |
485 // Machnode has multiple memory inputs. We are unable to reason | |
486 // with these, but are presuming (with trepidation) that not any of | |
487 // them are oops. This can be fixed by making get_base_and_disp() | |
488 // look at a specific input instead of all inputs. | |
489 assert(!def->bottom_type()->isa_oop_ptr(), "expecting non-oop mem input"); | |
490 } else if (base != fp || offset == Type::OffsetBot) { | |
491 // Do nothing: the fp operand is either not from a memory use | |
492 // (base == NULL) OR the fp is used in a non-memory context | |
493 // (base is some other register) OR the offset is not constant, | |
494 // so it is not a stack slot. | |
495 } else { | |
496 assert(offset >= 0, "unexpected negative offset"); | |
497 offset -= (offset % jintSize); // count the whole word | |
498 int stack_reg = regalloc->offset2reg(offset); | |
499 if (OptoReg::is_stack(stack_reg)) { | |
500 set_live_bit(tmp_live, stack_reg); | |
501 } else { | |
502 assert(false, "stack_reg not on stack?"); | |
503 } | |
504 } | |
505 } | |
506 } | |
507 | |
508 if( n->jvms() ) { // Record liveness at safepoint | |
509 | |
510 // This placement of this stanza means inputs to calls are | |
511 // considered live at the callsite's OopMap. Argument oops are | |
512 // hence live, but NOT included in the oopmap. See cutout in | |
513 // build_oop_map. Debug oops are live (and in OopMap). | |
514 int *n_live = NEW_ARENA_ARRAY(A, int, max_reg_ints); | |
515 for( int l=0; l<max_reg_ints; l++ ) | |
516 n_live[l] = tmp_live[l]; | |
517 safehash->Insert(n,n_live); | |
518 } | |
519 | |
520 } | |
521 | |
522 // Now at block top, see if we have any changes. If so, propagate | |
523 // to prior blocks. | |
524 int *old_live = &live[b->_pre_order*max_reg_ints]; | |
525 int l; | |
526 for( l=0; l<max_reg_ints; l++ ) | |
527 if( tmp_live[l] != old_live[l] ) | |
528 break; | |
529 if( l<max_reg_ints ) { // Change! | |
530 // Copy in new value | |
531 for( l=0; l<max_reg_ints; l++ ) | |
532 old_live[l] = tmp_live[l]; | |
533 // Push preds onto worklist | |
12023 | 534 for (l = 1; l < (int)b->num_preds(); l++) { |
535 Block* block = cfg->get_block_for_node(b->pred(l)); | |
536 worklist->push(block); | |
537 } | |
0 | 538 } |
539 } | |
540 | |
541 // Scan for any missing safepoints. Happens to infinite loops | |
542 // ala ZKM.jar | |
543 uint i; | |
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544 for (i = 1; i < cfg->number_of_blocks(); i++) { |
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545 Block* block = cfg->get_block(i); |
0 | 546 uint j; |
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547 for (j = 1; j < block->number_of_nodes(); j++) { |
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548 if (block->get_node(j)->jvms() && (*safehash)[block->get_node(j)] == NULL) { |
0 | 549 break; |
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550 } |
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551 } |
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552 if (j < block->number_of_nodes()) { |
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553 break; |
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554 } |
0 | 555 } |
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556 if (i == cfg->number_of_blocks()) { |
0 | 557 break; // Got 'em all |
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558 } |
0 | 559 #ifndef PRODUCT |
560 if( PrintOpto && Verbose ) | |
561 tty->print_cr("retripping live calc"); | |
562 #endif | |
563 // Force the issue (expensively): recheck everybody | |
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564 for (i = 1; i < cfg->number_of_blocks(); i++) { |
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565 worklist->push(cfg->get_block(i)); |
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566 } |
0 | 567 } |
568 } | |
569 | |
570 // Collect GC mask info - where are all the OOPs? | |
571 void Compile::BuildOopMaps() { | |
572 NOT_PRODUCT( TracePhase t3("bldOopMaps", &_t_buildOopMaps, TimeCompiler); ) | |
573 // Can't resource-mark because I need to leave all those OopMaps around, | |
574 // or else I need to resource-mark some arena other than the default. | |
575 // ResourceMark rm; // Reclaim all OopFlows when done | |
576 int max_reg = _regalloc->_max_reg; // Current array extent | |
577 | |
578 Arena *A = Thread::current()->resource_area(); | |
579 Block_List worklist; // Worklist of pending blocks | |
580 | |
581 int max_reg_ints = round_to(max_reg, BitsPerInt)>>LogBitsPerInt; | |
582 Dict *safehash = NULL; // Used for assert only | |
583 // Compute a backwards liveness per register. Needs a bitarray of | |
584 // #blocks x (#registers, rounded up to ints) | |
585 safehash = new Dict(cmpkey,hashkey,A); | |
586 do_liveness( _regalloc, _cfg, &worklist, max_reg_ints, A, safehash ); | |
587 OopFlow *free_list = NULL; // Free, unused | |
588 | |
589 // Array mapping blocks to completed oopflows | |
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590 OopFlow **flows = NEW_ARENA_ARRAY(A, OopFlow*, _cfg->number_of_blocks()); |
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591 memset( flows, 0, _cfg->number_of_blocks() * sizeof(OopFlow*) ); |
0 | 592 |
593 | |
594 // Do the first block 'by hand' to prime the worklist | |
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595 Block *entry = _cfg->get_block(1); |
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596 OopFlow *rootflow = OopFlow::make(A,max_reg,this); |
0 | 597 // Initialize to 'bottom' (not 'top') |
598 memset( rootflow->_callees, OptoReg::Bad, max_reg*sizeof(short) ); | |
599 memset( rootflow->_defs , 0, max_reg*sizeof(Node*) ); | |
600 flows[entry->_pre_order] = rootflow; | |
601 | |
602 // Do the first block 'by hand' to prime the worklist | |
603 rootflow->_b = entry; | |
604 rootflow->compute_reach( _regalloc, max_reg, safehash ); | |
605 for( uint i=0; i<entry->_num_succs; i++ ) | |
606 worklist.push(entry->_succs[i]); | |
607 | |
608 // Now worklist contains blocks which have some, but perhaps not all, | |
609 // predecessors visited. | |
610 while( worklist.size() ) { | |
611 // Scan for a block with all predecessors visited, or any randoms slob | |
612 // otherwise. All-preds-visited order allows me to recycle OopFlow | |
613 // structures rapidly and cut down on the memory footprint. | |
614 // Note: not all predecessors might be visited yet (must happen for | |
615 // irreducible loops). This is OK, since every live value must have the | |
616 // SAME reaching def for the block, so any reaching def is OK. | |
617 uint i; | |
618 | |
619 Block *b = worklist.pop(); | |
620 // Ignore root block | |
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621 if (b == _cfg->get_root_block()) { |
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622 continue; |
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623 } |
0 | 624 // Block is already done? Happens if block has several predecessors, |
625 // he can get on the worklist more than once. | |
626 if( flows[b->_pre_order] ) continue; | |
627 | |
628 // If this block has a visited predecessor AND that predecessor has this | |
629 // last block as his only undone child, we can move the OopFlow from the | |
630 // pred to this block. Otherwise we have to grab a new OopFlow. | |
631 OopFlow *flow = NULL; // Flag for finding optimized flow | |
632 Block *pred = (Block*)0xdeadbeef; | |
633 // Scan this block's preds to find a done predecessor | |
12023 | 634 for (uint j = 1; j < b->num_preds(); j++) { |
635 Block* p = _cfg->get_block_for_node(b->pred(j)); | |
0 | 636 OopFlow *p_flow = flows[p->_pre_order]; |
637 if( p_flow ) { // Predecessor is done | |
638 assert( p_flow->_b == p, "cross check" ); | |
639 pred = p; // Record some predecessor | |
640 // If all successors of p are done except for 'b', then we can carry | |
641 // p_flow forward to 'b' without copying, otherwise we have to draw | |
642 // from the free_list and clone data. | |
643 uint k; | |
644 for( k=0; k<p->_num_succs; k++ ) | |
645 if( !flows[p->_succs[k]->_pre_order] && | |
646 p->_succs[k] != b ) | |
647 break; | |
648 | |
649 // Either carry-forward the now-unused OopFlow for b's use | |
650 // or draw a new one from the free list | |
651 if( k==p->_num_succs ) { | |
652 flow = p_flow; | |
653 break; // Found an ideal pred, use him | |
654 } | |
655 } | |
656 } | |
657 | |
658 if( flow ) { | |
659 // We have an OopFlow that's the last-use of a predecessor. | |
660 // Carry it forward. | |
661 } else { // Draw a new OopFlow from the freelist | |
662 if( !free_list ) | |
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663 free_list = OopFlow::make(A,max_reg,C); |
0 | 664 flow = free_list; |
665 assert( flow->_b == NULL, "oopFlow is not free" ); | |
666 free_list = flow->_next; | |
667 flow->_next = NULL; | |
668 | |
669 // Copy/clone over the data | |
670 flow->clone(flows[pred->_pre_order], max_reg); | |
671 } | |
672 | |
673 // Mark flow for block. Blocks can only be flowed over once, | |
674 // because after the first time they are guarded from entering | |
675 // this code again. | |
676 assert( flow->_b == pred, "have some prior flow" ); | |
677 flow->_b = NULL; | |
678 | |
679 // Now push flow forward | |
680 flows[b->_pre_order] = flow;// Mark flow for this block | |
681 flow->_b = b; | |
682 flow->compute_reach( _regalloc, max_reg, safehash ); | |
683 | |
684 // Now push children onto worklist | |
685 for( i=0; i<b->_num_succs; i++ ) | |
686 worklist.push(b->_succs[i]); | |
687 | |
688 } | |
689 } |