Bug Summary

File:jdk/src/hotspot/share/adlc/dfa.cpp
Warning:line 809, column 7
Value stored to 'ok' is never read

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name dfa.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mthread-model posix -mframe-pointer=all -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D LINUX -D ASSERT -D AMD64 -I /home/daniel/Projects/java/jdk/src/hotspot/share -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/x86_64-linux-gnu/c++/7.5.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/x86_64-linux-gnu/c++/7.5.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wno-unused-parameter -Wno-unused -fdeprecated-macro -fdebug-compilation-dir /home/daniel/Projects/java/jdk/make/hotspot -ferror-limit 19 -fmessage-length 0 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -analyzer-output=html -faddrsig -o /home/daniel/Projects/java/scan/2021-12-21-193737-8510-1 -x c++ /home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp
1/*
2 * Copyright (c) 1997, 2018, 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// DFA.CPP - Method definitions for outputting the matcher DFA from ADLC
26#include "adlc.hpp"
27
28//---------------------------Switches for debugging output---------------------
29static bool debug_output = false;
30static bool debug_output1 = false; // top level chain rules
31
32//---------------------------Production State----------------------------------
33static const char *knownInvalid = "knownInvalid"; // The result does NOT have a rule defined
34static const char *knownValid = "knownValid"; // The result must be produced by a rule
35static const char *unknownValid = "unknownValid"; // Unknown (probably due to a child or predicate constraint)
36
37static const char *noConstraint = "noConstraint"; // No constraints seen so far
38static const char *hasConstraint = "hasConstraint"; // Within the first constraint
39
40
41//------------------------------Production------------------------------------
42// Track the status of productions for a particular result
43class Production {
44public:
45 const char *_result;
46 const char *_constraint;
47 const char *_valid;
48 Expr *_cost_lb; // Cost lower bound for this production
49 Expr *_cost_ub; // Cost upper bound for this production
50
51public:
52 Production(const char *result, const char *constraint, const char *valid);
53 ~Production() {};
54
55 void initialize(); // reset to be an empty container
56
57 const char *valid() const { return _valid; }
58 Expr *cost_lb() const { return (Expr *)_cost_lb; }
59 Expr *cost_ub() const { return (Expr *)_cost_ub; }
60
61 void print();
62};
63
64
65//------------------------------ProductionState--------------------------------
66// Track the status of all production rule results
67// Reset for each root opcode (e.g., Op_RegI, Op_AddI, ...)
68class ProductionState {
69private:
70 Dict _production; // map result of production, char*, to information or NULL
71 const char *_constraint;
72
73public:
74 // cmpstr does string comparisions. hashstr computes a key.
75 ProductionState(Arena *arena) : _production(cmpstr, hashstr, arena) { initialize(); };
76 ~ProductionState() { };
77
78 void initialize(); // reset local and dictionary state
79
80 const char *constraint();
81 void set_constraint(const char *constraint); // currently working inside of constraints
82
83 const char *valid(const char *result); // unknownValid, or status for this production
84 void set_valid(const char *result); // if not constrained, set status to knownValid
85
86 Expr *cost_lb(const char *result);
87 Expr *cost_ub(const char *result);
88 void set_cost_bounds(const char *result, const Expr *cost, bool has_state_check, bool has_cost_check);
89
90 // Return the Production associated with the result,
91 // or create a new Production and insert it into the dictionary.
92 Production *getProduction(const char *result);
93
94 void print();
95
96private:
97 // Disable public use of constructor, copy-ctor, ...
98 ProductionState( ) : _production(cmpstr, hashstr, Form::arena) { assert( false, "NotImplemented"){ if (!(false)) { fprintf(stderr, "assert fails %s %d: %s\n",
"/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 98, "NotImplemented"); abort(); }}
; };
99 ProductionState( const ProductionState & ) : _production(cmpstr, hashstr, Form::arena) { assert( false, "NotImplemented"){ if (!(false)) { fprintf(stderr, "assert fails %s %d: %s\n",
"/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 99, "NotImplemented"); abort(); }}
; }; // Deep-copy
100};
101
102
103//---------------------------Helper Functions----------------------------------
104// cost_check template:
105// 1) if (STATE__NOT_YET_VALID(EBXREGI) || _cost[EBXREGI] > c) {
106// 2) DFA_PRODUCTION(EBXREGI, cmovI_memu_rule, c)
107// 3) }
108//
109static void cost_check(FILE *fp, const char *spaces,
110 const char *arrayIdx, const Expr *cost, const char *rule, ProductionState &status) {
111 bool state_check = false; // true if this production needs to check validity
112 bool cost_check = false; // true if this production needs to check cost
113 bool cost_is_above_upper_bound = false; // true if this production is unnecessary due to high cost
114 bool cost_is_below_lower_bound = false; // true if this production replaces a higher cost production
115
116 // Get information about this production
117 const Expr *previous_ub = status.cost_ub(arrayIdx);
118 if( !previous_ub->is_unknown() ) {
119 if( previous_ub->less_than_or_equal(cost) ) {
120 cost_is_above_upper_bound = true;
121 if( debug_output ) { fprintf(fp, "// Previous rule with lower cost than: %s === %s_rule costs %s\n", arrayIdx, rule, cost->as_string()); }
122 }
123 }
124
125 const Expr *previous_lb = status.cost_lb(arrayIdx);
126 if( !previous_lb->is_unknown() ) {
127 if( cost->less_than_or_equal(previous_lb) ) {
128 cost_is_below_lower_bound = true;
129 if( debug_output ) { fprintf(fp, "// Previous rule with higher cost\n"); }
130 }
131 }
132
133 // line 1)
134 // Check for validity and compare to other match costs
135 const char *validity_check = status.valid(arrayIdx);
136 if( validity_check == unknownValid ) {
137 fprintf(fp, "%sif (STATE__NOT_YET_VALID(%s) || _cost[%s] > %s) {\n", spaces, arrayIdx, arrayIdx, cost->as_string());
138 state_check = true;
139 cost_check = true;
140 }
141 else if( validity_check == knownInvalid ) {
142 if( debug_output ) { fprintf(fp, "%s// %s KNOWN_INVALID \n", spaces, arrayIdx); }
143 }
144 else if( validity_check == knownValid ) {
145 if( cost_is_above_upper_bound ) {
146 // production cost is known to be too high.
147 return;
148 } else if( cost_is_below_lower_bound ) {
149 // production will unconditionally overwrite a previous production that had higher cost
150 } else {
151 fprintf(fp, "%sif ( /* %s KNOWN_VALID || */ _cost[%s] > %s) {\n", spaces, arrayIdx, arrayIdx, cost->as_string());
152 cost_check = true;
153 }
154 }
155
156 // line 2)
157 fprintf(fp, "%s DFA_PRODUCTION(%s, %s_rule, %s)", spaces, arrayIdx, rule, cost->as_string() );
158 if (validity_check == knownValid) {
159 if (cost_is_below_lower_bound) {
160 fprintf(fp, "\t // overwrites higher cost rule");
161 }
162 }
163 fprintf(fp, "\n");
164
165 // line 3)
166 if( cost_check || state_check ) {
167 fprintf(fp, "%s}\n", spaces);
168 }
169
170 status.set_cost_bounds(arrayIdx, cost, state_check, cost_check);
171
172 // Update ProductionState
173 if( validity_check != knownValid ) {
174 // set State vector if not previously known
175 status.set_valid(arrayIdx);
176 }
177}
178
179
180//---------------------------child_test----------------------------------------
181// Example:
182// STATE__VALID_CHILD(_kids[0], FOO) && STATE__VALID_CHILD(_kids[1], BAR)
183// Macro equivalent to: _kids[0]->valid(FOO) && _kids[1]->valid(BAR)
184//
185static void child_test(FILE *fp, MatchList &mList) {
186 if (mList._lchild) { // If left child, check it
187 const char* lchild_to_upper = ArchDesc::getMachOperEnum(mList._lchild);
188 fprintf(fp, "STATE__VALID_CHILD(_kids[0], %s)", lchild_to_upper);
189 delete[] lchild_to_upper;
190 }
191 if (mList._lchild && mList._rchild) { // If both, add the "&&"
192 fprintf(fp, " && ");
193 }
194 if (mList._rchild) { // If right child, check it
195 const char* rchild_to_upper = ArchDesc::getMachOperEnum(mList._rchild);
196 fprintf(fp, "STATE__VALID_CHILD(_kids[1], %s)", rchild_to_upper);
197 delete[] rchild_to_upper;
198 }
199}
200
201//---------------------------calc_cost-----------------------------------------
202// Example:
203// unsigned int c = _kids[0]->_cost[FOO] + _kids[1]->_cost[BAR] + 5;
204//
205Expr *ArchDesc::calc_cost(FILE *fp, const char *spaces, MatchList &mList, ProductionState &status) {
206 fprintf(fp, "%sunsigned int c = ", spaces);
207 Expr *c = new Expr("0");
208 if (mList._lchild) { // If left child, add it in
209 const char* lchild_to_upper = ArchDesc::getMachOperEnum(mList._lchild);
210 sprintf(Expr::buffer(), "_kids[0]->_cost[%s]", lchild_to_upper);
211 c->add(Expr::buffer());
212 delete[] lchild_to_upper;
213}
214 if (mList._rchild) { // If right child, add it in
215 const char* rchild_to_upper = ArchDesc::getMachOperEnum(mList._rchild);
216 sprintf(Expr::buffer(), "_kids[1]->_cost[%s]", rchild_to_upper);
217 c->add(Expr::buffer());
218 delete[] rchild_to_upper;
219 }
220 // Add in cost of this rule
221 const char *mList_cost = mList.get_cost();
222 c->add(mList_cost, *this);
223
224 fprintf(fp, "%s;\n", c->as_string());
225 c->set_external_name("c");
226 return c;
227}
228
229
230//---------------------------gen_match-----------------------------------------
231void ArchDesc::gen_match(FILE *fp, MatchList &mList, ProductionState &status, Dict &operands_chained_from) {
232 const char *spaces4 = " ";
233 const char *spaces6 = " ";
234
235 fprintf(fp, "%s", spaces4);
236 // Only generate child tests if this is not a leaf node
237 bool has_child_constraints = mList._lchild || mList._rchild;
238 const char *predicate_test = mList.get_pred();
239 if (has_child_constraints || predicate_test) {
240 // Open the child-and-predicate-test braces
241 fprintf(fp, "if( ");
242 status.set_constraint(hasConstraint);
243 child_test(fp, mList);
244 // Only generate predicate test if one exists for this match
245 if (predicate_test) {
246 if (has_child_constraints) {
247 fprintf(fp," &&\n");
248 }
249 fprintf(fp, "%s %s", spaces6, predicate_test);
250 }
251 // End of outer tests
252 fprintf(fp," ) ");
253 } else {
254 // No child or predicate test needed
255 status.set_constraint(noConstraint);
256 }
257
258 // End of outer tests
259 fprintf(fp,"{\n");
260
261 // Calculate cost of this match
262 const Expr *cost = calc_cost(fp, spaces6, mList, status);
263 // Check against other match costs, and update cost & rule vectors
264 cost_check(fp, spaces6, ArchDesc::getMachOperEnum(mList._resultStr), cost, mList._opcode, status);
265
266 // If this is a member of an operand class, update the class cost & rule
267 expand_opclass( fp, spaces6, cost, mList._resultStr, status);
268
269 // Check if this rule should be used to generate the chains as well.
270 const char *rule = /* set rule to "Invalid" for internal operands */
271 strcmp(mList._opcode, mList._resultStr) ? mList._opcode : "Invalid";
272
273 // If this rule produces an operand which has associated chain rules,
274 // update the operands with the chain rule + this rule cost & this rule.
275 chain_rule(fp, spaces6, mList._resultStr, cost, rule, operands_chained_from, status);
276
277 // Close the child-and-predicate-test braces
278 fprintf(fp, " }\n");
279
280}
281
282
283//---------------------------expand_opclass------------------------------------
284// Chain from one result_type to all other members of its operand class
285void ArchDesc::expand_opclass(FILE *fp, const char *indent, const Expr *cost,
286 const char *result_type, ProductionState &status) {
287 const Form *form = _globalNames[result_type];
288 OperandForm *op = form ? form->is_operand() : NULL__null;
289 if( op && op->_classes.count() > 0 ) {
290 if( debug_output ) { fprintf(fp, "// expand operand classes for operand: %s \n", (char *)op->_ident ); } // %%%%% Explanation
291 // Iterate through all operand classes which include this operand
292 op->_classes.reset();
293 const char *oclass;
294 // Expr *cCost = new Expr(cost);
295 while( (oclass = op->_classes.iter()) != NULL__null )
296 // Check against other match costs, and update cost & rule vectors
297 cost_check(fp, indent, ArchDesc::getMachOperEnum(oclass), cost, result_type, status);
298 }
299}
300
301//---------------------------chain_rule----------------------------------------
302// Starting at 'operand', check if we know how to automatically generate other results
303void ArchDesc::chain_rule(FILE *fp, const char *indent, const char *operand,
304 const Expr *icost, const char *irule, Dict &operands_chained_from, ProductionState &status) {
305
306 // Check if we have already generated chains from this starting point
307 if( operands_chained_from[operand] != NULL__null ) {
308 return;
309 } else {
310 operands_chained_from.Insert( operand, operand);
311 }
312 if( debug_output ) { fprintf(fp, "// chain rules starting from: %s and %s \n", (char *)operand, (char *)irule); } // %%%%% Explanation
313
314 ChainList *lst = (ChainList *)_chainRules[operand];
315 if (lst) {
316 // printf("\nChain from <%s> at cost #%s\n",operand, icost ? icost : "_");
317 const char *result, *cost, *rule;
318 for(lst->reset(); (lst->iter(result,cost,rule)) == true; ) {
319 // Do not generate operands that are already available
320 if( operands_chained_from[result] != NULL__null ) {
321 continue;
322 } else {
323 // Compute the cost for previous match + chain_rule_cost
324 // total_cost = icost + cost;
325 Expr *total_cost = icost->clone(); // icost + cost
326 total_cost->add(cost, *this);
327
328 // Check for transitive chain rules
329 Form *form = (Form *)_globalNames[rule];
330 if ( ! form->is_instruction()) {
331 // printf(" result=%s cost=%s rule=%s\n", result, total_cost, rule);
332 // Check against other match costs, and update cost & rule vectors
333 const char *reduce_rule = strcmp(irule,"Invalid") ? irule : rule;
334 cost_check(fp, indent, ArchDesc::getMachOperEnum(result), total_cost, reduce_rule, status);
335 chain_rule(fp, indent, result, total_cost, irule, operands_chained_from, status);
336 } else {
337 // printf(" result=%s cost=%s rule=%s\n", result, total_cost, rule);
338 // Check against other match costs, and update cost & rule vectors
339 cost_check(fp, indent, ArchDesc::getMachOperEnum(result), total_cost, rule, status);
340 chain_rule(fp, indent, result, total_cost, rule, operands_chained_from, status);
341 }
342
343 // If this is a member of an operand class, update class cost & rule
344 expand_opclass( fp, indent, total_cost, result, status );
345 }
346 }
347 }
348}
349
350//---------------------------prune_matchlist-----------------------------------
351// Check for duplicate entries in a matchlist, and prune out the higher cost
352// entry.
353void ArchDesc::prune_matchlist(Dict &minimize, MatchList &mlist) {
354
355}
356
357//---------------------------buildDFA------------------------------------------
358// DFA is a large switch with case statements for each ideal opcode encountered
359// in any match rule in the ad file. Each case has a series of if's to handle
360// the match or fail decisions. The matches test the cost function of that
361// rule, and prune any cases which are higher cost for the same reduction.
362// In order to generate the DFA we walk the table of ideal opcode/MatchList
363// pairs generated by the ADLC front end to build the contents of the case
364// statements (a series of if statements).
365void ArchDesc::buildDFA(FILE* fp) {
366 int i;
367 // Remember operands that are the starting points for chain rules.
368 // Prevent cycles by checking if we have already generated chain.
369 Dict operands_chained_from(cmpstr, hashstr, Form::arena);
370
371 // Hash inputs to match rules so that final DFA contains only one entry for
372 // each match pattern which is the low cost entry.
373 Dict minimize(cmpstr, hashstr, Form::arena);
374
375 // Track status of dfa for each resulting production
376 // reset for each ideal root.
377 ProductionState status(Form::arena);
378
379 // Output the start of the DFA method into the output file
380
381 fprintf(fp, "\n");
382 fprintf(fp, "//------------------------- Source -----------------------------------------\n");
383 // Do not put random source code into the DFA.
384 // If there are constants which need sharing, put them in "source_hpp" forms.
385 // _source.output(fp);
386 fprintf(fp, "\n");
387 fprintf(fp, "//------------------------- Attributes -------------------------------------\n");
388 _attributes.output(fp);
389 fprintf(fp, "\n");
390 fprintf(fp, "//------------------------- Macros -----------------------------------------\n");
391 fprintf(fp, "#define DFA_PRODUCTION(result, rule, cost)\\\n");
392 fprintf(fp, " assert(rule < (1 << 15), \"too many rules\"); _cost[ (result) ] = cost; _rule[ (result) ] = (rule << 1) | 0x1;\n");
393 fprintf(fp, "\n");
394
395 fprintf(fp, "//------------------------- DFA --------------------------------------------\n");
396
397 fprintf(fp,
398"// DFA is a large switch with case statements for each ideal opcode encountered\n"
399"// in any match rule in the ad file. Each case has a series of if's to handle\n"
400"// the match or fail decisions. The matches test the cost function of that\n"
401"// rule, and prune any cases which are higher cost for the same reduction.\n"
402"// In order to generate the DFA we walk the table of ideal opcode/MatchList\n"
403"// pairs generated by the ADLC front end to build the contents of the case\n"
404"// statements (a series of if statements).\n"
405);
406 fprintf(fp, "\n");
407 fprintf(fp, "\n");
408 if (_dfa_small) {
409 // Now build the individual routines just like the switch entries in large version
410 // Iterate over the table of MatchLists, start at first valid opcode of 1
411 for (i = 1; i < _last_opcode; i++) {
412 if (_mlistab[i] == NULL__null) continue;
413 // Generate the routine header statement for this opcode
414 fprintf(fp, "void State::_sub_Op_%s(const Node *n){\n", NodeClassNames[i]);
415 // Generate body. Shared for both inline and out-of-line version
416 gen_dfa_state_body(fp, minimize, status, operands_chained_from, i);
417 // End of routine
418 fprintf(fp, "}\n");
419 }
420 }
421 fprintf(fp, "bool State::DFA");
422 fprintf(fp, "(int opcode, const Node *n) {\n");
423 fprintf(fp, " switch(opcode) {\n");
424
425 // Iterate over the table of MatchLists, start at first valid opcode of 1
426 for (i = 1; i < _last_opcode; i++) {
427 if (_mlistab[i] == NULL__null) continue;
428 // Generate the case statement for this opcode
429 if (_dfa_small) {
430 fprintf(fp, " case Op_%s: { _sub_Op_%s(n);\n", NodeClassNames[i], NodeClassNames[i]);
431 } else {
432 fprintf(fp, " case Op_%s: {\n", NodeClassNames[i]);
433 // Walk the list, compacting it
434 gen_dfa_state_body(fp, minimize, status, operands_chained_from, i);
435 }
436 // Print the "break"
437 fprintf(fp, " break;\n");
438 fprintf(fp, " }\n");
439 }
440
441 // Generate the default case for switch(opcode)
442 fprintf(fp, " \n");
443 fprintf(fp, " default:\n");
444 fprintf(fp, " tty->print(\"Default case invoked for: \\n\");\n");
445 fprintf(fp, " tty->print(\" opcode = %cd, \\\"%cs\\\"\\n\", opcode, NodeClassNames[opcode]);\n", '%', '%');
446 fprintf(fp, " return false;\n");
447 fprintf(fp, " }\n");
448
449 // Return status, indicating a successful match.
450 fprintf(fp, " return true;\n");
451 // Generate the closing brace for method Matcher::DFA
452 fprintf(fp, "}\n");
453 Expr::check_buffers();
454}
455
456
457class dfa_shared_preds {
458 enum { count = 3 IA32_ONLY( + 1 ) };
459
460 static bool _found[count];
461 static const char* _type [count];
462 static const char* _var [count];
463 static const char* _pred [count];
464
465 static void check_index(int index) { assert( 0 <= index && index < count, "Invalid index"){ if (!(0 <= index && index < count)) { fprintf
(stderr, "assert fails %s %d: %s\n", "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 465, "Invalid index"); abort(); }}
; }
466
467 // Confirm that this is a separate sub-expression.
468 // Only need to catch common cases like " ... && shared ..."
469 // and avoid hazardous ones like "...->shared"
470 static bool valid_loc(char *pred, char *shared) {
471 // start of predicate is valid
472 if( shared == pred ) return true;
473
474 // Check previous character and recurse if needed
475 char *prev = shared - 1;
476 char c = *prev;
477 switch( c ) {
478 case ' ':
479 case '\n':
480 return dfa_shared_preds::valid_loc(pred, prev);
481 case '!':
482 case '(':
483 case '<':
484 case '=':
485 return true;
486 case '"': // such as: #line 10 "myfile.ad"\n mypredicate
487 return true;
488 case '|':
489 if (prev != pred && *(prev-1) == '|') return true;
490 break;
491 case '&':
492 if (prev != pred && *(prev-1) == '&') return true;
493 break;
494 default:
495 return false;
496 }
497
498 return false;
499 }
500
501public:
502
503 static bool found(int index){ check_index(index); return _found[index]; }
504 static void set_found(int index, bool val) { check_index(index); _found[index] = val; }
505 static void reset_found() {
506 for( int i = 0; i < count; ++i ) { _found[i] = false; }
507 };
508
509 static const char* type(int index) { check_index(index); return _type[index]; }
510 static const char* var (int index) { check_index(index); return _var [index]; }
511 static const char* pred(int index) { check_index(index); return _pred[index]; }
512
513 // Check each predicate in the MatchList for common sub-expressions
514 static void cse_matchlist(MatchList *matchList) {
515 for( MatchList *mList = matchList; mList != NULL__null; mList = mList->get_next() ) {
516 Predicate* predicate = mList->get_pred_obj();
517 char* pred = mList->get_pred();
518 if( pred != NULL__null ) {
519 for(int index = 0; index < count; ++index ) {
520 const char *shared_pred = dfa_shared_preds::pred(index);
521 const char *shared_pred_var = dfa_shared_preds::var(index);
522 bool result = dfa_shared_preds::cse_predicate(predicate, shared_pred, shared_pred_var);
523 if( result ) dfa_shared_preds::set_found(index, true);
524 }
525 }
526 }
527 }
528
529 // If the Predicate contains a common sub-expression, replace the Predicate's
530 // string with one that uses the variable name.
531 static bool cse_predicate(Predicate* predicate, const char *shared_pred, const char *shared_pred_var) {
532 bool result = false;
533 char *pred = predicate->_pred;
534 if( pred != NULL__null ) {
535 char *new_pred = pred;
536 for( char *shared_pred_loc = strstr(new_pred, shared_pred);
537 shared_pred_loc != NULL__null && dfa_shared_preds::valid_loc(new_pred,shared_pred_loc);
538 shared_pred_loc = strstr(new_pred, shared_pred) ) {
539 // Do not modify the original predicate string, it is shared
540 if( new_pred == pred ) {
541 new_pred = strdup(pred);
542 shared_pred_loc = strstr(new_pred, shared_pred);
543 }
544 // Replace shared_pred with variable name
545 strncpy(shared_pred_loc, shared_pred_var, strlen(shared_pred_var));
546 }
547 // Install new predicate
548 if( new_pred != pred ) {
549 predicate->_pred = new_pred;
550 result = true;
551 }
552 }
553 return result;
554 }
555
556 // Output the hoisted common sub-expression if we found it in predicates
557 static void generate_cse(FILE *fp) {
558 for(int j = 0; j < count; ++j ) {
559 if( dfa_shared_preds::found(j) ) {
560 const char *shared_pred_type = dfa_shared_preds::type(j);
561 const char *shared_pred_var = dfa_shared_preds::var(j);
562 const char *shared_pred = dfa_shared_preds::pred(j);
563 fprintf(fp, " %s %s = %s;\n", shared_pred_type, shared_pred_var, shared_pred);
564 }
565 }
566 }
567};
568// shared predicates, _var and _pred entry should be the same length
569bool dfa_shared_preds::_found[dfa_shared_preds::count] = { false, false, false IA32_ONLY(COMMA false) };
570const char* dfa_shared_preds::_type [dfa_shared_preds::count] = { "int", "jlong", "intptr_t" IA32_ONLY(COMMA "bool") };
571const char* dfa_shared_preds::_var [dfa_shared_preds::count] = { "_n_get_int__", "_n_get_long__", "_n_get_intptr_t__" IA32_ONLY(COMMA "Compile__current____select_24_bit_instr__") };
572const char* dfa_shared_preds::_pred [dfa_shared_preds::count] = { "n->get_int()", "n->get_long()", "n->get_intptr_t()" IA32_ONLY(COMMA "Compile::current()->select_24_bit_instr()") };
573
574void ArchDesc::gen_dfa_state_body(FILE* fp, Dict &minimize, ProductionState &status, Dict &operands_chained_from, int i) {
575 // Start the body of each Op_XXX sub-dfa with a clean state.
576 status.initialize();
577
578 // Walk the list, compacting it
579 MatchList* mList = _mlistab[i];
580 do {
581 // Hash each entry using inputs as key and pointer as data.
582 // If there is already an entry, keep the one with lower cost, and
583 // remove the other one from the list.
584 prune_matchlist(minimize, *mList);
585 // Iterate
586 mList = mList->get_next();
587 } while(mList != NULL__null);
588
589 // Hoist previously specified common sub-expressions out of predicates
590 dfa_shared_preds::reset_found();
591 dfa_shared_preds::cse_matchlist(_mlistab[i]);
592 dfa_shared_preds::generate_cse(fp);
593
594 mList = _mlistab[i];
595
596 // Walk the list again, generating code
597 do {
598 // Each match can generate its own chains
599 operands_chained_from.Clear();
600 gen_match(fp, *mList, status, operands_chained_from);
601 mList = mList->get_next();
602 } while(mList != NULL__null);
603 // Fill in any chain rules which add instructions
604 // These can generate their own chains as well.
605 operands_chained_from.Clear(); //
606 if( debug_output1 ) { fprintf(fp, "// top level chain rules for: %s \n", (char *)NodeClassNames[i]); } // %%%%% Explanation
607 const Expr *zeroCost = new Expr("0");
608 chain_rule(fp, " ", (char *)NodeClassNames[i], zeroCost, "Invalid",
609 operands_chained_from, status);
610}
611
612
613
614//------------------------------Expr------------------------------------------
615Expr *Expr::_unknown_expr = NULL__null;
616char Expr::string_buffer[STRING_BUFFER_LENGTH2048];
617char Expr::external_buffer[STRING_BUFFER_LENGTH2048];
618bool Expr::_init_buffers = Expr::init_buffers();
619
620Expr::Expr() {
621 _external_name = NULL__null;
622 _expr = "Invalid_Expr";
623 _min_value = Expr::Max;
624 _max_value = Expr::Zero;
625}
626Expr::Expr(const char *cost) {
627 _external_name = NULL__null;
628
629 int intval = 0;
630 if( cost == NULL__null ) {
631 _expr = "0";
632 _min_value = Expr::Zero;
633 _max_value = Expr::Zero;
634 }
635 else if( ADLParser::is_int_token(cost, intval) ) {
636 _expr = cost;
637 _min_value = intval;
638 _max_value = intval;
639 }
640 else {
641 assert( strcmp(cost,"0") != 0, "Recognize string zero as an int"){ if (!(strcmp(cost,"0") != 0)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 641, "Recognize string zero as an int"); abort(); }}
;
642 _expr = cost;
643 _min_value = Expr::Zero;
644 _max_value = Expr::Max;
645 }
646}
647
648Expr::Expr(const char *name, const char *expression, int min_value, int max_value) {
649 _external_name = name;
650 _expr = expression ? expression : name;
651 _min_value = min_value;
652 _max_value = max_value;
653 assert(_min_value >= 0 && _min_value <= Expr::Max, "value out of range"){ if (!(_min_value >= 0 && _min_value <= Expr::
Max)) { fprintf(stderr, "assert fails %s %d: %s\n", "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 653, "value out of range"); abort(); }}
;
654 assert(_max_value >= 0 && _max_value <= Expr::Max, "value out of range"){ if (!(_max_value >= 0 && _max_value <= Expr::
Max)) { fprintf(stderr, "assert fails %s %d: %s\n", "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 654, "value out of range"); abort(); }}
;
655}
656
657Expr *Expr::clone() const {
658 Expr *cost = new Expr();
659 cost->_external_name = _external_name;
660 cost->_expr = _expr;
661 cost->_min_value = _min_value;
662 cost->_max_value = _max_value;
663
664 return cost;
665}
666
667void Expr::add(const Expr *c) {
668 // Do not update fields until all computation is complete
669 const char *external = compute_external(this, c);
670 const char *expr = compute_expr(this, c);
671 int min_value = compute_min (this, c);
672 int max_value = compute_max (this, c);
673
674 _external_name = external;
675 _expr = expr;
676 _min_value = min_value;
677 _max_value = max_value;
678}
679
680void Expr::add(const char *c) {
681 Expr *cost = new Expr(c);
682 add(cost);
683}
684
685void Expr::add(const char *c, ArchDesc &AD) {
686 const Expr *e = AD.globalDefs()[c];
687 if( e != NULL__null ) {
688 // use the value of 'c' defined in <arch>.ad
689 add(e);
690 } else {
691 Expr *cost = new Expr(c);
692 add(cost);
693 }
694}
695
696const char *Expr::compute_external(const Expr *c1, const Expr *c2) {
697 const char * result = NULL__null;
698
699 // Preserve use of external name which has a zero value
700 if( c1->_external_name != NULL__null ) {
701 if( c2->is_zero() ) {
702 snprintf(string_buffer, STRING_BUFFER_LENGTH2048, "%s", c1->as_string());
703 } else {
704 snprintf(string_buffer, STRING_BUFFER_LENGTH2048, "%s+%s", c1->as_string(), c2->as_string());
705 }
706 string_buffer[STRING_BUFFER_LENGTH2048 - 1] = '\0';
707 result = strdup(string_buffer);
708 }
709 else if( c2->_external_name != NULL__null ) {
710 if( c1->is_zero() ) {
711 snprintf(string_buffer, STRING_BUFFER_LENGTH2048, "%s", c2->_external_name);
712 } else {
713 snprintf(string_buffer, STRING_BUFFER_LENGTH2048, "%s + %s", c1->as_string(), c2->as_string());
714 }
715 string_buffer[STRING_BUFFER_LENGTH2048 - 1] = '\0';
716 result = strdup(string_buffer);
717 }
718 return result;
719}
720
721const char *Expr::compute_expr(const Expr *c1, const Expr *c2) {
722 if( !c1->is_zero() ) {
723 if( c2->is_zero() ) {
724 snprintf(string_buffer, STRING_BUFFER_LENGTH2048, "%s", c1->_expr);
725 } else {
726 snprintf(string_buffer, STRING_BUFFER_LENGTH2048, "%s+%s", c1->_expr, c2->_expr);
727 }
728 }
729 else if( !c2->is_zero() ) {
730 snprintf(string_buffer, STRING_BUFFER_LENGTH2048, "%s", c2->_expr);
731 }
732 else {
733 sprintf( string_buffer, "0");
734 }
735 string_buffer[STRING_BUFFER_LENGTH2048 - 1] = '\0';
736 char *cost = strdup(string_buffer);
737
738 return cost;
739}
740
741int Expr::compute_min(const Expr *c1, const Expr *c2) {
742 int v1 = c1->_min_value;
743 int v2 = c2->_min_value;
744 assert(0 <= v2 && v2 <= Expr::Max, "sanity"){ if (!(0 <= v2 && v2 <= Expr::Max)) { fprintf(
stderr, "assert fails %s %d: %s\n", "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 744, "sanity"); abort(); }}
;
745 assert(v1 <= Expr::Max - v2, "Invalid cost computation"){ if (!(v1 <= Expr::Max - v2)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 745, "Invalid cost computation"); abort(); }}
;
746
747 return v1 + v2;
748}
749
750
751int Expr::compute_max(const Expr *c1, const Expr *c2) {
752 int v1 = c1->_max_value;
753 int v2 = c2->_max_value;
754
755 // Check for overflow without producing UB. If v2 is positive
756 // and not larger than Max, the subtraction cannot underflow.
757 assert(0 <= v2 && v2 <= Expr::Max, "sanity"){ if (!(0 <= v2 && v2 <= Expr::Max)) { fprintf(
stderr, "assert fails %s %d: %s\n", "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 757, "sanity"); abort(); }}
;
758 if (v1 > Expr::Max - v2) {
759 return Expr::Max;
760 }
761
762 return v1 + v2;
763}
764
765void Expr::print() const {
766 if( _external_name != NULL__null ) {
767 printf(" %s == (%s) === [%d, %d]\n", _external_name, _expr, _min_value, _max_value);
768 } else {
769 printf(" %s === [%d, %d]\n", _expr, _min_value, _max_value);
770 }
771}
772
773void Expr::print_define(FILE *fp) const {
774 assert( _external_name != NULL, "definition does not have a name"){ if (!(_external_name != __null)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 774, "definition does not have a name"); abort(); }}
;
775 assert( _min_value == _max_value, "Expect user definitions to have constant value"){ if (!(_min_value == _max_value)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 775, "Expect user definitions to have constant value"); abort
(); }}
;
776 fprintf(fp, "#define %s (%s) \n", _external_name, _expr);
777 fprintf(fp, "// value == %d \n", _min_value);
778}
779
780void Expr::print_assert(FILE *fp) const {
781 assert( _external_name != NULL, "definition does not have a name"){ if (!(_external_name != __null)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 781, "definition does not have a name"); abort(); }}
;
782 assert( _min_value == _max_value, "Expect user definitions to have constant value"){ if (!(_min_value == _max_value)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 782, "Expect user definitions to have constant value"); abort
(); }}
;
783 fprintf(fp, " assert( %s == %d, \"Expect (%s) to equal %d\");\n", _external_name, _min_value, _expr, _min_value);
784}
785
786Expr *Expr::get_unknown() {
787 if( Expr::_unknown_expr == NULL__null ) {
788 Expr::_unknown_expr = new Expr();
789 }
790
791 return Expr::_unknown_expr;
792}
793
794bool Expr::init_buffers() {
795 // Fill buffers with 0
796 for( int i = 0; i < STRING_BUFFER_LENGTH2048; ++i ) {
797 external_buffer[i] = '\0';
798 string_buffer[i] = '\0';
799 }
800
801 return true;
802}
803
804bool Expr::check_buffers() {
805 // returns 'true' if buffer use may have overflowed
806 bool ok = true;
807 for( int i = STRING_BUFFER_LENGTH2048 - 100; i < STRING_BUFFER_LENGTH2048; ++i) {
808 if( external_buffer[i] != '\0' || string_buffer[i] != '\0' ) {
809 ok = false;
Value stored to 'ok' is never read
810 assert( false, "Expr:: Buffer overflow"){ if (!(false)) { fprintf(stderr, "assert fails %s %d: %s\n",
"/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 810, "Expr:: Buffer overflow"); abort(); }}
;
811 }
812 }
813
814 return ok;
815}
816
817
818//------------------------------ExprDict---------------------------------------
819// Constructor
820ExprDict::ExprDict( CmpKey cmp, Hash hash, Arena *arena )
821 : _expr(cmp, hash, arena), _defines() {
822}
823ExprDict::~ExprDict() {
824}
825
826// Return # of name-Expr pairs in dict
827int ExprDict::Size(void) const {
828 return _expr.Size();
829}
830
831// define inserts the given key-value pair into the dictionary,
832// and records the name in order for later output, ...
833const Expr *ExprDict::define(const char *name, Expr *expr) {
834 const Expr *old_expr = (*this)[name];
835 assert(old_expr == NULL, "Implementation does not support redefinition"){ if (!(old_expr == __null)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 835, "Implementation does not support redefinition"); abort
(); }}
;
836
837 _expr.Insert(name, expr);
838 _defines.addName(name);
839
840 return old_expr;
841}
842
843// Insert inserts the given key-value pair into the dictionary. The prior
844// value of the key is returned; NULL if the key was not previously defined.
845const Expr *ExprDict::Insert(const char *name, Expr *expr) {
846 return (Expr*)_expr.Insert((void*)name, (void*)expr);
847}
848
849// Finds the value of a given key; or NULL if not found.
850// The dictionary is NOT changed.
851const Expr *ExprDict::operator [](const char *name) const {
852 return (Expr*)_expr[name];
853}
854
855void ExprDict::print_defines(FILE *fp) {
856 fprintf(fp, "\n");
857 const char *name = NULL__null;
858 for( _defines.reset(); (name = _defines.iter()) != NULL__null; ) {
859 const Expr *expr = (const Expr*)_expr[name];
860 assert( expr != NULL, "name in ExprDict without matching Expr in dictionary"){ if (!(expr != __null)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 860, "name in ExprDict without matching Expr in dictionary"
); abort(); }}
;
861 expr->print_define(fp);
862 }
863}
864void ExprDict::print_asserts(FILE *fp) {
865 fprintf(fp, "\n");
866 fprintf(fp, " // Following assertions generated from definition section\n");
867 const char *name = NULL__null;
868 for( _defines.reset(); (name = _defines.iter()) != NULL__null; ) {
869 const Expr *expr = (const Expr*)_expr[name];
870 assert( expr != NULL, "name in ExprDict without matching Expr in dictionary"){ if (!(expr != __null)) { fprintf(stderr, "assert fails %s %d: %s\n"
, "/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 870, "name in ExprDict without matching Expr in dictionary"
); abort(); }}
;
871 expr->print_assert(fp);
872 }
873}
874
875// Print out the dictionary contents as key-value pairs
876static void dumpekey(const void* key) { fprintf(stdoutstdout, "%s", (char*) key); }
877static void dumpexpr(const void* expr) { fflush(stdoutstdout); ((Expr*)expr)->print(); }
878
879void ExprDict::dump() {
880 _expr.print(dumpekey, dumpexpr);
881}
882
883
884//------------------------------ExprDict::private------------------------------
885// Disable public use of constructor, copy-ctor, operator =, operator ==
886ExprDict::ExprDict( ) : _expr(cmpkey,hashkey), _defines() {
887 assert( false, "NotImplemented"){ if (!(false)) { fprintf(stderr, "assert fails %s %d: %s\n",
"/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 887, "NotImplemented"); abort(); }}
;
888}
889ExprDict::ExprDict( const ExprDict & ) : _expr(cmpkey,hashkey), _defines() {
890 assert( false, "NotImplemented"){ if (!(false)) { fprintf(stderr, "assert fails %s %d: %s\n",
"/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 890, "NotImplemented"); abort(); }}
;
891}
892ExprDict &ExprDict::operator =( const ExprDict &rhs) {
893 assert( false, "NotImplemented"){ if (!(false)) { fprintf(stderr, "assert fails %s %d: %s\n",
"/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 893, "NotImplemented"); abort(); }}
;
894 _expr = rhs._expr;
895 return *this;
896}
897// == compares two dictionaries; they must have the same keys (their keys
898// must match using CmpKey) and they must have the same values (pointer
899// comparison). If so 1 is returned, if not 0 is returned.
900bool ExprDict::operator ==(const ExprDict &d) const {
901 assert( false, "NotImplemented"){ if (!(false)) { fprintf(stderr, "assert fails %s %d: %s\n",
"/home/daniel/Projects/java/jdk/src/hotspot/share/adlc/dfa.cpp"
, 901, "NotImplemented"); abort(); }}
;
902 return false;
903}
904
905
906//------------------------------Production-------------------------------------
907Production::Production(const char *result, const char *constraint, const char *valid) {
908 initialize();
909 _result = result;
910 _constraint = constraint;
911 _valid = valid;
912}
913
914void Production::initialize() {
915 _result = NULL__null;
916 _constraint = NULL__null;
917 _valid = knownInvalid;
918 _cost_lb = Expr::get_unknown();
919 _cost_ub = Expr::get_unknown();
920}
921
922void Production::print() {
923 printf("%s", (_result == NULL__null ? "NULL" : _result ) );
924 printf("%s", (_constraint == NULL__null ? "NULL" : _constraint ) );
925 printf("%s", (_valid == NULL__null ? "NULL" : _valid ) );
926 _cost_lb->print();
927 _cost_ub->print();
928}
929
930
931//------------------------------ProductionState--------------------------------
932void ProductionState::initialize() {
933 _constraint = noConstraint;
934
935 // reset each Production currently in the dictionary
936 DictI iter( &_production );
937 const void *x, *y = NULL__null;
938 for( ; iter.test(); ++iter) {
939 x = iter._key;
940 y = iter._value;
941 Production *p = (Production*)y;
942 if( p != NULL__null ) {
943 p->initialize();
944 }
945 }
946}
947
948Production *ProductionState::getProduction(const char *result) {
949 Production *p = (Production *)_production[result];
950 if( p == NULL__null ) {
951 p = new Production(result, _constraint, knownInvalid);
952 _production.Insert(result, p);
953 }
954
955 return p;
956}
957
958void ProductionState::set_constraint(const char *constraint) {
959 _constraint = constraint;
960}
961
962const char *ProductionState::valid(const char *result) {
963 return getProduction(result)->valid();
964}
965
966void ProductionState::set_valid(const char *result) {
967 Production *p = getProduction(result);
968
969 // Update valid as allowed by current constraints
970 if( _constraint == noConstraint ) {
971 p->_valid = knownValid;
972 } else {
973 if( p->_valid != knownValid ) {
974 p->_valid = unknownValid;
975 }
976 }
977}
978
979Expr *ProductionState::cost_lb(const char *result) {
980 return getProduction(result)->cost_lb();
981}
982
983Expr *ProductionState::cost_ub(const char *result) {
984 return getProduction(result)->cost_ub();
985}
986
987void ProductionState::set_cost_bounds(const char *result, const Expr *cost, bool has_state_check, bool has_cost_check) {
988 Production *p = getProduction(result);
989
990 if( p->_valid == knownInvalid ) {
991 // Our cost bounds are not unknown, just not defined.
992 p->_cost_lb = cost->clone();
993 p->_cost_ub = cost->clone();
994 } else if (has_state_check || _constraint != noConstraint) {
995 // The production is protected by a condition, so
996 // the cost bounds may expand.
997 // _cost_lb = min(cost, _cost_lb)
998 if( cost->less_than_or_equal(p->_cost_lb) ) {
999 p->_cost_lb = cost->clone();
1000 }
1001 // _cost_ub = max(cost, _cost_ub)
1002 if( p->_cost_ub->less_than_or_equal(cost) ) {
1003 p->_cost_ub = cost->clone();
1004 }
1005 } else if (has_cost_check) {
1006 // The production has no condition check, but does
1007 // have a cost check that could reduce the upper
1008 // and/or lower bound.
1009 // _cost_lb = min(cost, _cost_lb)
1010 if( cost->less_than_or_equal(p->_cost_lb) ) {
1011 p->_cost_lb = cost->clone();
1012 }
1013 // _cost_ub = min(cost, _cost_ub)
1014 if( cost->less_than_or_equal(p->_cost_ub) ) {
1015 p->_cost_ub = cost->clone();
1016 }
1017 } else {
1018 // The costs are unconditionally set.
1019 p->_cost_lb = cost->clone();
1020 p->_cost_ub = cost->clone();
1021 }
1022
1023}
1024
1025// Print out the dictionary contents as key-value pairs
1026static void print_key (const void* key) { fprintf(stdoutstdout, "%s", (char*) key); }
1027static void print_production(const void* production) { fflush(stdoutstdout); ((Production*)production)->print(); }
1028
1029void ProductionState::print() {
1030 _production.print(print_key, print_production);
1031}