1 /*
2 * Copyright (c) 1998, 2025, 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 #include "classfile/symbolTable.hpp"
26 #include "compiler/compilerDirectives.hpp"
27 #include "compiler/compilerOracle.hpp"
28 #include "compiler/methodMatcher.hpp"
29 #include "jvm.h"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "oops/klass.hpp"
34 #include "oops/method.inline.hpp"
35 #include "oops/symbol.hpp"
36 #include "opto/phasetype.hpp"
37 #include "opto/traceAutoVectorizationTag.hpp"
38 #include "opto/traceMergeStoresTag.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/handles.inline.hpp"
41 #include "runtime/jniHandles.hpp"
42 #include "runtime/os.hpp"
43 #include "utilities/istream.hpp"
44 #include "utilities/parseInteger.hpp"
45
46 // Default compile commands, if defined, are parsed before any of the
47 // explicitly defined compile commands. Thus, explicitly defined compile
48 // commands take precedence over default compile commands. The effect is
49 // as if the default compile commands had been specified at the start of
50 // the command line.
51 static const char* const default_compile_commands[] = {
52 #ifdef ASSERT
53 // In debug builds, impose a (generous) per-compilation memory limit
54 // to catch pathological compilations during testing. The suboption
55 // "crash" will cause the JVM to assert.
56 //
57 // Note: to disable the default limit at the command line,
58 // set a limit of 0 (e.g. -XX:CompileCommand=MemLimit,*.*,0).
59 "MemLimit,*.*,1G~crash",
60 #endif
61 nullptr };
62
63 static const char* optiontype_names[] = {
64 #define enum_of_types(type, name) name,
65 OPTION_TYPES(enum_of_types)
66 #undef enum_of_types
67 };
68
69 static const char* optiontype2name(enum OptionType type) {
70 return optiontype_names[static_cast<int>(type)];
71 }
72
73 static enum OptionType option_types[] = {
74 #define enum_of_options(option, name, ctype) OptionType::ctype,
75 COMPILECOMMAND_OPTIONS(enum_of_options)
76 #undef enum_of_options
77 };
78
79 static enum OptionType option2type(CompileCommandEnum option) {
80 return option_types[static_cast<int>(option)];
81 }
82
83 static const char* option_names[] = {
84 #define enum_of_options(option, name, ctype) name,
85 COMPILECOMMAND_OPTIONS(enum_of_options)
86 #undef enum_of_options
87 };
88
89 static const char* option2name(CompileCommandEnum option) {
90 return option_names[static_cast<int>(option)];
91 }
92
93 /* Methods to map real type names to OptionType */
94 template<typename T>
95 static OptionType get_type_for() {
96 return OptionType::Unknown;
97 };
98
99 template<> OptionType get_type_for<intx>() {
100 return OptionType::Intx;
101 }
102
103 template<> OptionType get_type_for<uintx>() {
104 return OptionType::Uintx;
105 }
106
107 template<> OptionType get_type_for<bool>() {
108 return OptionType::Bool;
109 }
110
111 template<> OptionType get_type_for<ccstr>() {
112 return OptionType::Ccstr;
113 }
114
115 template<> OptionType get_type_for<double>() {
116 return OptionType::Double;
117 }
118
119 class MethodMatcher;
120 class TypedMethodOptionMatcher;
121
122 static TypedMethodOptionMatcher* option_list = nullptr;
123 static bool any_set = false;
124
125 // A filter for quick lookup if an option is set
126 static bool option_filter[static_cast<int>(CompileCommandEnum::Unknown) + 1] = { 0 };
127
128 static void command_set_in_filter(CompileCommandEnum option) {
129 assert(option != CompileCommandEnum::Unknown, "sanity");
130 assert(option2type(option) != OptionType::Unknown, "sanity");
131
132 if ((option != CompileCommandEnum::DontInline) &&
133 (option != CompileCommandEnum::Inline) &&
134 (option != CompileCommandEnum::Log)) {
135 any_set = true;
136 }
137 option_filter[static_cast<int>(option)] = true;
138 }
139
140 static bool has_command(CompileCommandEnum option) {
141 return option_filter[static_cast<int>(option)];
142 }
143
144 class TypedMethodOptionMatcher : public MethodMatcher {
145 private:
146 TypedMethodOptionMatcher* _next;
147 CompileCommandEnum _option;
148 public:
149
150 union {
151 bool bool_value;
152 intx intx_value;
153 uintx uintx_value;
154 double double_value;
155 ccstr ccstr_value;
156 } _u;
157
158 TypedMethodOptionMatcher() : MethodMatcher(),
159 _next(nullptr),
160 _option(CompileCommandEnum::Unknown) {
161 memset(&_u, 0, sizeof(_u));
162 }
163
164 ~TypedMethodOptionMatcher();
165 static TypedMethodOptionMatcher* parse_method_pattern(char*& line, char* errorbuf, const int buf_size);
166 TypedMethodOptionMatcher* match(const methodHandle &method, CompileCommandEnum option);
167
168 void init(CompileCommandEnum option, TypedMethodOptionMatcher* next) {
169 _next = next;
170 _option = option;
171 }
172
173 void init_matcher(Symbol* class_name, Mode class_mode,
174 Symbol* method_name, Mode method_mode,
175 Symbol* signature) {
176 MethodMatcher::init(class_name, class_mode, method_name, method_mode, signature);
177 }
178
179 void set_next(TypedMethodOptionMatcher* next) {_next = next; }
180 TypedMethodOptionMatcher* next() { return _next; }
181 CompileCommandEnum option() { return _option; }
182 template<typename T> T value();
183 template<typename T> void set_value(T value);
184 void print();
185 void print_all();
186 TypedMethodOptionMatcher* clone();
187 };
188
189 // A few templated accessors instead of a full template class.
190 template<> intx TypedMethodOptionMatcher::value<intx>() {
191 return _u.intx_value;
192 }
193
194 template<> uintx TypedMethodOptionMatcher::value<uintx>() {
195 return _u.uintx_value;
196 }
197
198 template<> bool TypedMethodOptionMatcher::value<bool>() {
199 return _u.bool_value;
200 }
201
202 template<> double TypedMethodOptionMatcher::value<double>() {
203 return _u.double_value;
204 }
205
206 template<> ccstr TypedMethodOptionMatcher::value<ccstr>() {
207 return _u.ccstr_value;
208 }
209
210 template<> void TypedMethodOptionMatcher::set_value(intx value) {
211 _u.intx_value = value;
212 }
213
214 template<> void TypedMethodOptionMatcher::set_value(uintx value) {
215 _u.uintx_value = value;
216 }
217
218 template<> void TypedMethodOptionMatcher::set_value(double value) {
219 _u.double_value = value;
220 }
221
222 template<> void TypedMethodOptionMatcher::set_value(bool value) {
223 _u.bool_value = value;
224 }
225
226 template<> void TypedMethodOptionMatcher::set_value(ccstr value) {
227 _u.ccstr_value = (ccstr)os::strdup_check_oom(value);
228 }
229
230 void TypedMethodOptionMatcher::print() {
231 ttyLocker ttyl;
232 print_base(tty);
233 const char* name = option2name(_option);
234 enum OptionType type = option2type(_option);
235 switch (type) {
236 case OptionType::Intx:
237 tty->print_cr(" intx %s = %zd", name, value<intx>());
238 break;
239 case OptionType::Uintx:
240 tty->print_cr(" uintx %s = %zu", name, value<uintx>());
241 break;
242 case OptionType::Bool:
243 tty->print_cr(" bool %s = %s", name, value<bool>() ? "true" : "false");
244 break;
245 case OptionType::Double:
246 tty->print_cr(" double %s = %f", name, value<double>());
247 break;
248 case OptionType::Ccstr:
249 case OptionType::Ccstrlist:
250 tty->print_cr(" const char* %s = '%s'", name, value<ccstr>());
251 break;
252 default:
253 ShouldNotReachHere();
254 }
255 }
256
257 void TypedMethodOptionMatcher::print_all() {
258 print();
259 if (_next != nullptr) {
260 tty->print(" ");
261 _next->print_all();
262 }
263 }
264
265 TypedMethodOptionMatcher* TypedMethodOptionMatcher::clone() {
266 TypedMethodOptionMatcher* m = new TypedMethodOptionMatcher();
267 m->_class_mode = _class_mode;
268 m->_class_name = _class_name;
269 m->_method_mode = _method_mode;
270 m->_method_name = _method_name;
271 m->_signature = _signature;
272 // Need to ref count the symbols
273 if (_class_name != nullptr) {
274 _class_name->increment_refcount();
275 }
276 if (_method_name != nullptr) {
277 _method_name->increment_refcount();
278 }
279 if (_signature != nullptr) {
280 _signature->increment_refcount();
281 }
282 return m;
283 }
284
285 TypedMethodOptionMatcher::~TypedMethodOptionMatcher() {
286 enum OptionType type = option2type(_option);
287 if (type == OptionType::Ccstr || type == OptionType::Ccstrlist) {
288 ccstr v = value<ccstr>();
289 os::free((void*)v);
290 }
291 }
292
293 TypedMethodOptionMatcher* TypedMethodOptionMatcher::parse_method_pattern(char*& line, char* errorbuf, const int buf_size) {
294 assert(*errorbuf == '\0', "Dont call here with error_msg already set");
295 const char* error_msg = nullptr;
296 TypedMethodOptionMatcher* tom = new TypedMethodOptionMatcher();
297 MethodMatcher::parse_method_pattern(line, error_msg, tom);
298 if (error_msg != nullptr) {
299 jio_snprintf(errorbuf, buf_size, error_msg);
300 delete tom;
301 return nullptr;
302 }
303 return tom;
304 }
305
306 TypedMethodOptionMatcher* TypedMethodOptionMatcher::match(const methodHandle& method, CompileCommandEnum option) {
307 TypedMethodOptionMatcher* current = this;
308 while (current != nullptr) {
309 if (current->_option == option) {
310 if (current->matches(method)) {
311 return current;
312 }
313 }
314 current = current->next();
315 }
316 return nullptr;
317 }
318
319 template<typename T>
320 static bool register_command(TypedMethodOptionMatcher* matcher,
321 CompileCommandEnum option,
322 char* errorbuf,
323 const int buf_size,
324 T value) {
325 assert(matcher != option_list, "No circular lists please");
326 if (option == CompileCommandEnum::Log && !LogCompilation) {
327 tty->print_cr("Warning: +LogCompilation must be enabled in order for individual methods to be logged with ");
328 tty->print_cr(" CompileCommand=log,<method pattern>");
329 }
330 assert(CompilerOracle::option_matches_type(option, value), "Value must match option type");
331
332 if (option == CompileCommandEnum::Blackhole && !UnlockExperimentalVMOptions) {
333 warning("Blackhole compile option is experimental and must be enabled via -XX:+UnlockExperimentalVMOptions");
334 // Delete matcher as we don't keep it
335 delete matcher;
336 return true;
337 }
338
339 if (!UnlockDiagnosticVMOptions) {
340 const char* name = option2name(option);
341 JVMFlag* flag = JVMFlag::find_declared_flag(name);
342 if (flag != nullptr && flag->is_diagnostic()) {
343 jio_snprintf(errorbuf, buf_size, "VM option '%s' is diagnostic and must be enabled via -XX:+UnlockDiagnosticVMOptions.", name);
344 delete matcher;
345 return false;
346 }
347 }
348
349 matcher->init(option, option_list);
350 matcher->set_value<T>(value);
351 option_list = matcher;
352 command_set_in_filter(option);
353
354 if (!CompilerOracle::be_quiet()) {
355 // Print out the successful registration of a compile command
356 ttyLocker ttyl;
357 tty->print("CompileCommand: %s ", option2name(option));
358 matcher->print();
359 }
360
361 return true;
362 }
363
364 template<typename T>
365 bool CompilerOracle::has_option_value(const methodHandle& method, CompileCommandEnum option, T& value) {
366 assert(option_matches_type(option, value), "Value must match option type");
367 if (!has_command(option)) {
368 return false;
369 }
370 if (option_list != nullptr) {
371 TypedMethodOptionMatcher* m = option_list->match(method, option);
372 if (m != nullptr) {
373 value = m->value<T>();
374 return true;
375 }
376 }
377 return false;
378 }
379
380 static bool resolve_inlining_predicate(CompileCommandEnum option, const methodHandle& method) {
381 assert(option == CompileCommandEnum::Inline || option == CompileCommandEnum::DontInline, "Sanity");
382 bool v1 = false;
383 bool v2 = false;
384 bool has_inline = CompilerOracle::has_option_value(method, CompileCommandEnum::Inline, v1);
385 bool has_dnotinline = CompilerOracle::has_option_value(method, CompileCommandEnum::DontInline, v2);
386 if (has_inline && has_dnotinline) {
387 if (v1 && v2) {
388 // Conflict options detected
389 // Find the last one for that method and return the predicate accordingly
390 // option_list lists options in reverse order. So the first option we find is the last which was specified.
391 CompileCommandEnum last_one = CompileCommandEnum::Unknown;
392 TypedMethodOptionMatcher* current = option_list;
393 while (current != nullptr) {
394 last_one = current->option();
395 if (last_one == CompileCommandEnum::Inline || last_one == CompileCommandEnum::DontInline) {
396 if (current->matches(method)) {
397 return last_one == option;
398 }
399 }
400 current = current->next();
401 }
402 ShouldNotReachHere();
403 return false;
404 } else {
405 // No conflicts
406 return option == CompileCommandEnum::Inline ? v1 : v2;
407 }
408 } else {
409 if (option == CompileCommandEnum::Inline) {
410 return has_inline ? v1 : false;
411 } else {
412 return has_dnotinline ? v2 : false;
413 }
414 }
415 }
416
417 static bool check_predicate(CompileCommandEnum option, const methodHandle& method) {
418 // Special handling for Inline and DontInline since conflict options may be specified
419 if (option == CompileCommandEnum::Inline || option == CompileCommandEnum::DontInline) {
420 return resolve_inlining_predicate(option, method);
421 }
422
423 bool value = false;
424 if (CompilerOracle::has_option_value(method, option, value)) {
425 return value;
426 }
427 return false;
428 }
429
430 bool CompilerOracle::has_any_command_set() {
431 return any_set;
432 }
433
434 // Explicit instantiation for all OptionTypes supported.
435 template bool CompilerOracle::has_option_value<intx>(const methodHandle& method, CompileCommandEnum option, intx& value);
436 template bool CompilerOracle::has_option_value<uintx>(const methodHandle& method, CompileCommandEnum option, uintx& value);
437 template bool CompilerOracle::has_option_value<bool>(const methodHandle& method, CompileCommandEnum option, bool& value);
438 template bool CompilerOracle::has_option_value<ccstr>(const methodHandle& method, CompileCommandEnum option, ccstr& value);
439 template bool CompilerOracle::has_option_value<double>(const methodHandle& method, CompileCommandEnum option, double& value);
440
441 template<typename T>
442 bool CompilerOracle::option_matches_type(CompileCommandEnum option, T& value) {
443 enum OptionType option_type = option2type(option);
444 if (option_type == OptionType::Unknown) {
445 return false; // Can't query options with type Unknown.
446 }
447 if (option_type == OptionType::Ccstrlist) {
448 option_type = OptionType::Ccstr; // CCstrList type options are stored as Ccstr
449 }
450 return (get_type_for<T>() == option_type);
451 }
452
453 template bool CompilerOracle::option_matches_type<intx>(CompileCommandEnum option, intx& value);
454 template bool CompilerOracle::option_matches_type<uintx>(CompileCommandEnum option, uintx& value);
455 template bool CompilerOracle::option_matches_type<bool>(CompileCommandEnum option, bool& value);
456 template bool CompilerOracle::option_matches_type<ccstr>(CompileCommandEnum option, ccstr& value);
457 template bool CompilerOracle::option_matches_type<double>(CompileCommandEnum option, double& value);
458
459 bool CompilerOracle::has_option(const methodHandle& method, CompileCommandEnum option) {
460 bool value = false;
461 has_option_value(method, option, value);
462 return value;
463 }
464
465 bool CompilerOracle::should_exclude(const methodHandle& method) {
466 if (check_predicate(CompileCommandEnum::Exclude, method)) {
467 return true;
468 }
469 if (has_command(CompileCommandEnum::CompileOnly)) {
470 return !check_predicate(CompileCommandEnum::CompileOnly, method);
471 }
472 return false;
473 }
474
475 bool CompilerOracle::should_inline(const methodHandle& method) {
476 return (check_predicate(CompileCommandEnum::Inline, method));
477 }
478
479 bool CompilerOracle::should_not_inline(const methodHandle& method) {
480 return check_predicate(CompileCommandEnum::DontInline, method) || check_predicate(CompileCommandEnum::Exclude, method);
481 }
482
483 bool CompilerOracle::should_print(const methodHandle& method) {
484 return check_predicate(CompileCommandEnum::Print, method);
485 }
486
487 bool CompilerOracle::should_print_methods() {
488 return has_command(CompileCommandEnum::Print);
489 }
490
491 // Tells whether there are any methods to collect memory statistics for
492 bool CompilerOracle::should_collect_memstat() {
493 return has_command(CompileCommandEnum::MemStat) || has_command(CompileCommandEnum::MemLimit);
494 }
495
496 bool CompilerOracle::should_log(const methodHandle& method) {
497 if (!LogCompilation) return false;
498 if (!has_command(CompileCommandEnum::Log)) {
499 return true; // by default, log all
500 }
501 return (check_predicate(CompileCommandEnum::Log, method));
502 }
503
504 bool CompilerOracle::should_break_at(const methodHandle& method) {
505 return check_predicate(CompileCommandEnum::Break, method);
506 }
507
508 void CompilerOracle::tag_blackhole_if_possible(const methodHandle& method) {
509 if (!check_predicate(CompileCommandEnum::Blackhole, method)) {
510 return;
511 }
512 guarantee(UnlockExperimentalVMOptions, "Checked during initial parsing");
513 if (method->result_type() != T_VOID) {
514 warning("Blackhole compile option only works for methods with void type: %s",
515 method->name_and_sig_as_C_string());
516 return;
517 }
518 if (!method->is_empty_method()) {
519 warning("Blackhole compile option only works for empty methods: %s",
520 method->name_and_sig_as_C_string());
521 return;
522 }
523 if (!method->is_static()) {
524 warning("Blackhole compile option only works for static methods: %s",
525 method->name_and_sig_as_C_string());
526 return;
527 }
528 if (method->intrinsic_id() == vmIntrinsics::_blackhole) {
529 return;
530 }
531 if (method->intrinsic_id() != vmIntrinsics::_none) {
532 warning("Blackhole compile option only works for methods that do not have intrinsic set: %s, %s",
533 method->name_and_sig_as_C_string(), vmIntrinsics::name_at(method->intrinsic_id()));
534 return;
535 }
536 method->set_intrinsic_id(vmIntrinsics::_blackhole);
537 }
538
539 static CompileCommandEnum match_option_name(const char* line, int* bytes_read, char* errorbuf, int bufsize) {
540 assert(ARRAY_SIZE(option_names) == static_cast<int>(CompileCommandEnum::Count), "option_names size mismatch");
541
542 *bytes_read = 0;
543 char option_buf[256];
544 int matches = sscanf(line, "%255[a-zA-Z0-9]%n", option_buf, bytes_read);
545 if (matches > 0 && strcasecmp(option_buf, "unknown") != 0) {
546 for (uint i = 0; i < ARRAY_SIZE(option_names); i++) {
547 if (strcasecmp(option_buf, option_names[i]) == 0) {
548 return static_cast<CompileCommandEnum>(i);
549 }
550 }
551 }
552 jio_snprintf(errorbuf, bufsize, "Unrecognized option '%s'", option_buf);
553 return CompileCommandEnum::Unknown;
554 }
555
556 // match exactly and don't mess with errorbuf
557 CompileCommandEnum CompilerOracle::parse_option_name(const char* line) {
558 for (uint i = 0; i < ARRAY_SIZE(option_names); i++) {
559 if (strcasecmp(line, option_names[i]) == 0) {
560 return static_cast<CompileCommandEnum>(i);
561 }
562 }
563 return CompileCommandEnum::Unknown;
564 }
565
566 enum OptionType CompilerOracle::parse_option_type(const char* type_str) {
567 for (uint i = 0; i < ARRAY_SIZE(optiontype_names); i++) {
568 if (strcasecmp(type_str, optiontype_names[i]) == 0) {
569 return static_cast<enum OptionType>(i);
570 }
571 }
572 return OptionType::Unknown;
573 }
574
575 static void print_tip() { // CMH Update info
576 tty->cr();
577 tty->print_cr("Usage: '-XX:CompileCommand=<option>,<method pattern>' - to set boolean option to true");
578 tty->print_cr("Usage: '-XX:CompileCommand=<option>,<method pattern>,<value>'");
579 tty->print_cr("Use: '-XX:CompileCommand=help' for more information and to list all option.");
580 tty->cr();
581 }
582
583 static void print_option(CompileCommandEnum option, const char* name, enum OptionType type) {
584 if (type != OptionType::Unknown) {
585 tty->print_cr(" %s (%s)", name, optiontype2name(type));
586 }
587 }
588
589 static void print_commands() {
590 tty->cr();
591 tty->print_cr("All available options:");
592 #define enum_of_options(option, name, ctype) print_option(CompileCommandEnum::option, name, OptionType::ctype);
593 COMPILECOMMAND_OPTIONS(enum_of_options)
594 #undef enum_of_options
595 tty->cr();
596 }
597
598 static void usage() {
599 tty->cr();
600 tty->print_cr("The CompileCommand option enables the user of the JVM to control specific");
601 tty->print_cr("behavior of the dynamic compilers.");
602 tty->cr();
603 tty->print_cr("Compile commands has this general form:");
604 tty->print_cr("-XX:CompileCommand=<option><method pattern><value>");
605 tty->print_cr(" Sets <option> to the specified value for methods matching <method pattern>");
606 tty->print_cr(" All options are typed");
607 tty->cr();
608 tty->print_cr("-XX:CompileCommand=<option><method pattern>");
609 tty->print_cr(" Sets <option> to true for methods matching <method pattern>");
610 tty->print_cr(" Only applies to boolean options.");
611 tty->cr();
612 tty->print_cr("-XX:CompileCommand=quiet");
613 tty->print_cr(" Silence the compile command output");
614 tty->cr();
615 tty->print_cr("-XX:CompileCommand=help");
616 tty->print_cr(" Prints this help text");
617 tty->cr();
618 print_commands();
619 tty->cr();
620 tty->print_cr("The <method pattern> has the format '<class>.<method><descriptor>'.");
621 tty->cr();
622 tty->print_cr("For example, the <method pattern>");
623 tty->cr();
624 tty->print_cr(" package/Class.method(Lpackage/Parameter;)Lpackage/Return;");
625 tty->cr();
626 tty->print_cr("matches the <method> 'method' in <class> 'package/Class' with <descriptor>");
627 tty->print_cr("'(Lpackage/Parameter;)Lpackage/Return;'");
628 tty->cr();
629 tty->print_cr("For backward compatibility this form is also allowed:");
630 tty->cr();
631 tty->print_cr(" package.Class::method(Lpackage.Parameter;)Lpackage.Return;");
632 tty->cr();
633 tty->print_cr("A whitespace or comma can optionally separate the <descriptor> from the");
634 tty->print_cr("<method>:");
635 tty->cr();
636 tty->print_cr(" package/Class.method (Lpackage/Parameter;)Lpackage/Return;");
637 tty->print_cr(" package/Class.method,(Lpackage/Parameter;)Lpackage/Return;");
638 tty->cr();
639 tty->print_cr("The <class> and <method> accept leading and trailing '*' wildcards");
640 tty->print_cr("matching:");
641 tty->cr();
642 tty->print_cr(" *ackage/Clas*.*etho*(Lpackage/Parameter;)Lpackage/Return;");
643 tty->cr();
644 tty->print_cr("The <descriptor> does not support explicit wildcards and");
645 tty->print_cr("always has an implicit trailing wildcard. Therefore,");
646 tty->cr();
647 tty->print_cr(" package/Class.method(Lpackage/Parameter;)Lpackage/Return;");
648 tty->cr();
649 tty->print_cr("matches a subset of");
650 tty->cr();
651 tty->print_cr(" package/Class.method(Lpackage/Parameter;)");
652 tty->cr();
653 tty->print_cr("which matches a subset of");
654 tty->cr();
655 tty->print_cr(" package/Class.method");
656 tty->cr();
657 tty->print_cr("which matches all possible descriptors.");
658 tty->cr();
659 tty->print_cr("It is possible to use more than one CompileCommand on the command line:");
660 tty->print_cr(" -XX:CompileCommand=exclude,java/*.* -XX:CompileCommand=log,java*.*");
661 tty->cr();
662 tty->print_cr("The CompileCommands can be loaded from a file with the flag");
663 tty->print_cr("-XX:CompileCommandFile=<file> or be added to the file '.hotspot_compiler'");
664 tty->print_cr("Use the same format in the file as the argument to the CompileCommand flag.");
665 tty->print_cr("Add one command on each line.");
666 tty->print_cr(" exclude java/*.*");
667 tty->print_cr(" option java/*.* ReplayInline");
668 tty->cr();
669 tty->print_cr("The following commands have conflicting behavior: 'exclude', 'inline', 'dontinline',");
670 tty->print_cr("and 'compileonly'. There is no priority of commands. Applying (a subset of) these");
671 tty->print_cr("commands to the same method results in undefined behavior.");
672 tty->cr();
673 tty->print_cr("The 'exclude' command excludes methods from top-level compilations as well as");
674 tty->print_cr("from inlining, whereas the 'compileonly' command only excludes methods from");
675 tty->print_cr("top-level compilations (i.e. they can still be inlined into other compilation units).");
676 tty->cr();
677 };
678
679 static int skip_whitespace(char* &line) {
680 // Skip any leading spaces
681 int whitespace_read = 0;
682 sscanf(line, "%*[ \t]%n", &whitespace_read);
683 line += whitespace_read;
684 return whitespace_read;
685 }
686
687 static void skip_comma(char* &line) {
688 // Skip any leading spaces
689 if (*line == ',') {
690 line++;
691 }
692 }
693
694 static bool parseMemLimit(const char* line, intx& value, int& bytes_read, char* errorbuf, const int buf_size) {
695 // Format:
696 // "<memory size>['~' <suboption>]"
697 // <memory size> can have units, e.g. M
698 // <suboption> one of "crash" "stop", if omitted, "stop" is implied.
699 //
700 // Examples:
701 // -XX:CompileCommand='memlimit,*.*,20m'
702 // -XX:CompileCommand='memlimit,*.*,20m~stop'
703 // -XX:CompileCommand='memlimit,Option::toString,1m~crash'
704 //
705 // The resulting intx carries the size and whether we are to stop or crash:
706 // - neg. value means crash
707 // - pos. value (default) means stop
708 size_t s = 0;
709 char* end;
710 if (!parse_integer<size_t>(line, &end, &s)) {
711 jio_snprintf(errorbuf, buf_size, "MemLimit: invalid value");
712 return false;
713 }
714 bytes_read = (int)(end - line);
715
716 intx v = (intx)s;
717 if ((*end) != '\0') {
718 if (strncasecmp(end, "~crash", 6) == 0) {
719 v = -v;
720 bytes_read += 6;
721 } else if (strncasecmp(end, "~stop", 5) == 0) {
722 // ok, this is the default
723 bytes_read += 5;
724 } else {
725 jio_snprintf(errorbuf, buf_size, "MemLimit: invalid option");
726 return false;
727 }
728 }
729 value = v;
730 return true;
731 }
732
733 static bool parseMemStat(const char* line, uintx& value, int& bytes_read, char* errorbuf, const int buf_size) {
734
735 #define IF_ENUM_STRING(S, CMD) \
736 if (strncasecmp(line, S, strlen(S)) == 0) { \
737 bytes_read += (int)strlen(S); \
738 CMD \
739 return true; \
740 }
741
742 IF_ENUM_STRING("collect", {
743 value = (uintx)MemStatAction::collect;
744 });
745 IF_ENUM_STRING("print", {
746 value = (uintx)MemStatAction::print;
747 });
748 #undef IF_ENUM_STRING
749
750 jio_snprintf(errorbuf, buf_size, "MemStat: invalid option");
751
752 return false;
753 }
754
755 static bool scan_value(enum OptionType type, char* line, int& total_bytes_read,
756 TypedMethodOptionMatcher* matcher, CompileCommandEnum option, char* errorbuf, const int buf_size) {
757 int bytes_read = 0;
758 const char* ccname = option2name(option);
759 const char* type_str = optiontype2name(type);
760 int skipped = skip_whitespace(line);
761 total_bytes_read += skipped;
762 if (type == OptionType::Intx) {
763 intx value;
764 bool success = false;
765 if (option == CompileCommandEnum::MemLimit) {
766 // Special parsing for MemLimit
767 success = parseMemLimit(line, value, bytes_read, errorbuf, buf_size);
768 } else {
769 // Is it a raw number?
770 success = sscanf(line, "%zd%n", &value, &bytes_read) == 1;
771 }
772 if (success) {
773 total_bytes_read += bytes_read;
774 return register_command(matcher, option, errorbuf, buf_size, value);
775 } else {
776 jio_snprintf(errorbuf, buf_size, "Value cannot be read for option '%s' of type '%s'", ccname, type_str);
777 return false;
778 }
779 } else if (type == OptionType::Uintx) {
780 uintx value;
781 bool success = false;
782 if (option == CompileCommandEnum::MemStat) {
783 // Special parsing for MemStat
784 success = parseMemStat(line, value, bytes_read, errorbuf, buf_size);
785 } else {
786 // parse as raw number
787 success = sscanf(line, "%zu%n", &value, &bytes_read) == 1;
788 }
789 if (success) {
790 total_bytes_read += bytes_read;
791 return register_command(matcher, option, errorbuf, buf_size, value);
792 } else {
793 jio_snprintf(errorbuf, buf_size, "Value cannot be read for option '%s' of type '%s'", ccname, type_str);
794 return false;
795 }
796 } else if (type == OptionType::Ccstr) {
797 ResourceMark rm;
798 char* value = NEW_RESOURCE_ARRAY(char, strlen(line) + 1);
799 if (sscanf(line, "%255[_a-zA-Z0-9]%n", value, &bytes_read) == 1) {
800 total_bytes_read += bytes_read;
801 return register_command(matcher, option, errorbuf, buf_size, (ccstr) value);
802 } else {
803 jio_snprintf(errorbuf, buf_size, "Value cannot be read for option '%s' of type '%s'", ccname, type_str);
804 return false;
805 }
806 } else if (type == OptionType::Ccstrlist) {
807 // Accumulates several strings into one. The internal type is ccstr.
808 ResourceMark rm;
809 char* value = NEW_RESOURCE_ARRAY(char, strlen(line) + 1);
810 char* next_value = value;
811 if (sscanf(line, "%255[_a-zA-Z0-9+\\-]%n", next_value, &bytes_read) == 1) {
812 total_bytes_read += bytes_read;
813 line += bytes_read;
814 next_value += bytes_read + 1;
815 char* end_value = next_value - 1;
816 while (sscanf(line, "%*[ \t]%255[_a-zA-Z0-9+\\-]%n", next_value, &bytes_read) == 1) {
817 total_bytes_read += bytes_read;
818 line += bytes_read;
819 *end_value = ' '; // override '\0'
820 next_value += bytes_read;
821 end_value = next_value-1;
822 }
823
824 if (option == CompileCommandEnum::ControlIntrinsic || option == CompileCommandEnum::DisableIntrinsic) {
825 ControlIntrinsicValidator validator(value, (option == CompileCommandEnum::DisableIntrinsic));
826
827 if (!validator.is_valid()) {
828 jio_snprintf(errorbuf, buf_size, "Unrecognized intrinsic detected in %s: %s", option2name(option), validator.what());
829 return false;
830 }
831 }
832 #if !defined(PRODUCT) && defined(COMPILER2)
833 else if (option == CompileCommandEnum::TraceAutoVectorization) {
834 TraceAutoVectorizationTagValidator validator(value, true);
835
836 if (!validator.is_valid()) {
837 jio_snprintf(errorbuf, buf_size, "Unrecognized tag name in %s: %s", option2name(option), validator.what());
838 return false;
839 }
840 } else if (option == CompileCommandEnum::TraceMergeStores) {
841 TraceMergeStores::TagValidator validator(value, true);
842
843 if (!validator.is_valid()) {
844 jio_snprintf(errorbuf, buf_size, "Unrecognized tag name in %s: %s", option2name(option), validator.what());
845 return false;
846 }
847 } else if (option == CompileCommandEnum::PrintIdealPhase) {
848 PhaseNameValidator validator(value);
849
850 if (!validator.is_valid()) {
851 jio_snprintf(errorbuf, buf_size, "Unrecognized phase name in %s: %s", option2name(option), validator.what());
852 return false;
853 }
854 } else if (option == CompileCommandEnum::TestOptionList) {
855 // all values are ok
856 } else if (option == CompileCommandEnum::TooManyTrapsAtBCI) {
857 // FIXME
858 }
859 #endif
860 else {
861 assert(false, "Ccstrlist type option missing validator");
862 }
863
864 return register_command(matcher, option, errorbuf, buf_size, (ccstr) value);
865 } else {
866 jio_snprintf(errorbuf, buf_size, "Value cannot be read for option '%s' of type '%s'", ccname, type_str);
867 return false;
868 }
869 } else if (type == OptionType::Bool) {
870 char value[256];
871 if (*line == '\0') {
872 // Short version of a CompileCommand sets a boolean Option to true
873 // -XXCompileCommand=<Option>,<method pattern>
874 return register_command(matcher, option, errorbuf, buf_size,true);
875 }
876 if (sscanf(line, "%255[a-zA-Z]%n", value, &bytes_read) == 1) {
877 if (strcasecmp(value, "true") == 0) {
878 total_bytes_read += bytes_read;
879 return register_command(matcher, option, errorbuf, buf_size,true);
880 } else if (strcasecmp(value, "false") == 0) {
881 total_bytes_read += bytes_read;
882 return register_command(matcher, option, errorbuf, buf_size,false);
883 } else {
884 jio_snprintf(errorbuf, buf_size, "Value cannot be read for option '%s' of type '%s'", ccname, type_str);
885 return false;
886 }
887 } else {
888 jio_snprintf(errorbuf, buf_size, "Value cannot be read for option '%s' of type '%s'", ccname, type_str);
889 return false;
890 }
891 } else if (type == OptionType::Double) {
892 char buffer[2][256];
893 // Decimal separator '.' has been replaced with ' ' or '/' earlier,
894 // so read integer and fraction part of double value separately.
895 if (sscanf(line, "%255[0-9]%*[ /\t]%255[0-9]%n", buffer[0], buffer[1], &bytes_read) == 2) {
896 char value[512] = "";
897 jio_snprintf(value, sizeof(value), "%s.%s", buffer[0], buffer[1]);
898 total_bytes_read += bytes_read;
899 return register_command(matcher, option, errorbuf, buf_size, atof(value));
900 } else {
901 jio_snprintf(errorbuf, buf_size, "Value cannot be read for option '%s' of type '%s'", ccname, type_str);
902 return false;
903 }
904 } else {
905 jio_snprintf(errorbuf, buf_size, "Type '%s' not supported ", type_str);
906 return false;
907 }
908 }
909
910 // Scan next option and value in line, return MethodMatcher object on success, nullptr on failure.
911 // On failure, error_msg contains description for the first error.
912 // For future extensions: set error_msg on first error.
913 static bool scan_option_and_value(enum OptionType type, char* line, int& total_bytes_read,
914 TypedMethodOptionMatcher* matcher,
915 char* errorbuf, const int buf_size) {
916 total_bytes_read = 0;
917 int bytes_read = 0;
918 char option_buf[256];
919
920 // Read option name.
921 if (sscanf(line, "%*[ \t]%255[a-zA-Z0-9]%n", option_buf, &bytes_read) == 1) {
922 line += bytes_read;
923 total_bytes_read += bytes_read;
924 int bytes_read2 = 0;
925 total_bytes_read += skip_whitespace(line);
926 CompileCommandEnum option = match_option_name(option_buf, &bytes_read2, errorbuf, buf_size);
927 if (option == CompileCommandEnum::Unknown) {
928 assert(*errorbuf != '\0', "error must have been set");
929 return false;
930 }
931 enum OptionType optiontype = option2type(option);
932 if (option2type(option) != type) {
933 const char* optiontype_name = optiontype2name(optiontype);
934 const char* type_name = optiontype2name(type);
935 jio_snprintf(errorbuf, buf_size, "Option '%s' with type '%s' doesn't match supplied type '%s'", option_buf, optiontype_name, type_name);
936 return false;
937 }
938 return scan_value(type, line, total_bytes_read, matcher, option, errorbuf, buf_size);
939 } else {
940 const char* type_str = optiontype2name(type);
941 jio_snprintf(errorbuf, buf_size, "Option name for type '%s' should be alphanumeric ", type_str);
942 return false;
943 }
944 }
945
946 void CompilerOracle::print_parse_error(char* error_msg, char* original_line) {
947 assert(*error_msg != '\0', "Must have error_message");
948 ttyLocker ttyl;
949 tty->print_cr("CompileCommand: An error occurred during parsing");
950 tty->print_cr("Error: %s", error_msg);
951 tty->print_cr("Line: '%s'", original_line);
952 print_tip();
953 }
954
955 class LineCopy : StackObj {
956 const char* _copy;
957 public:
958 LineCopy(char* line) {
959 _copy = os::strdup(line, mtInternal);
960 }
961 ~LineCopy() {
962 os::free((void*)_copy);
963 }
964 char* get() {
965 return (char*)_copy;
966 }
967 };
968
969 bool CompilerOracle::parse_from_line_quietly(char* line) {
970 const bool quiet0 = _quiet;
971 _quiet = true;
972 const bool result = parse_from_line(line);
973 _quiet = quiet0;
974 return result;
975 }
976
977 bool CompilerOracle::parse_from_line(char* line) {
978 if ((line[0] == '\0') || (line[0] == '#')) {
979 return true;
980 }
981
982 LineCopy original(line);
983 int bytes_read;
984 char error_buf[1024] = {0};
985
986 CompileCommandEnum option = match_option_name(line, &bytes_read, error_buf, sizeof(error_buf));
987 line += bytes_read;
988 ResourceMark rm;
989
990 if (option == CompileCommandEnum::Unknown) {
991 print_parse_error(error_buf, original.get());
992 return false;
993 }
994
995 if (option == CompileCommandEnum::Quiet) {
996 _quiet = true;
997 return true;
998 }
999
1000 if (option == CompileCommandEnum::Help) {
1001 usage();
1002 return true;
1003 }
1004
1005 if (option == CompileCommandEnum::Option) {
1006 // Look for trailing options.
1007 //
1008 // Two types of trailing options are
1009 // supported:
1010 //
1011 // (1) CompileCommand=option,Klass::method,option
1012 // (2) CompileCommand=option,Klass::method,type,option,value
1013 //
1014 // Type (1) is used to enable a boolean option for a method.
1015 //
1016 // Type (2) is used to support options with a value. Values can have the
1017 // the following types: intx, uintx, bool, ccstr, ccstrlist, and double.
1018
1019 char option_type[256]; // stores option for Type (1) and type of Type (2)
1020 skip_comma(line);
1021 TypedMethodOptionMatcher* archetype = TypedMethodOptionMatcher::parse_method_pattern(line, error_buf, sizeof(error_buf));
1022 if (archetype == nullptr) {
1023 print_parse_error(error_buf, original.get());
1024 return false;
1025 }
1026
1027 skip_whitespace(line);
1028
1029 // This is unnecessarily complex. Should retire multi-option lines and skip while loop
1030 while (sscanf(line, "%255[a-zA-Z0-9]%n", option_type, &bytes_read) == 1) {
1031 line += bytes_read;
1032
1033 // typed_matcher is used as a blueprint for each option, deleted at the end
1034 TypedMethodOptionMatcher* typed_matcher = archetype->clone();
1035 enum OptionType type = parse_option_type(option_type);
1036 if (type != OptionType::Unknown) {
1037 // Type (2) option: parse option name and value.
1038 if (!scan_option_and_value(type, line, bytes_read, typed_matcher, error_buf, sizeof(error_buf))) {
1039 print_parse_error(error_buf, original.get());
1040 return false;
1041 }
1042 line += bytes_read;
1043 } else {
1044 // Type (1) option - option_type contains the option name -> bool value = true is implied
1045 int bytes_read;
1046 CompileCommandEnum option = match_option_name(option_type, &bytes_read, error_buf, sizeof(error_buf));
1047 if (option == CompileCommandEnum::Unknown) {
1048 print_parse_error(error_buf, original.get());
1049 return false;
1050 }
1051 if (option2type(option) == OptionType::Bool) {
1052 if (!register_command(typed_matcher, option, error_buf, sizeof(error_buf), true)) {
1053 print_parse_error(error_buf, original.get());
1054 return false;
1055 }
1056 } else {
1057 jio_snprintf(error_buf, sizeof(error_buf), " Missing type '%s' before option '%s'",
1058 optiontype2name(option2type(option)), option2name(option));
1059 print_parse_error(error_buf, original.get());
1060 return false;
1061 }
1062 }
1063 assert(typed_matcher != nullptr, "sanity");
1064 assert(*error_buf == '\0', "No error here");
1065 skip_whitespace(line);
1066 } // while(
1067 delete archetype;
1068 } else { // not an OptionCommand
1069 // Command has the following form:
1070 // CompileCommand=<option>,<method pattern><value>
1071 // CompileCommand=<option>,<method pattern> (implies option is bool and value is true)
1072 assert(*error_buf == '\0', "Don't call here with error_buf already set");
1073 enum OptionType type = option2type(option);
1074 int bytes_read = 0;
1075 skip_comma(line);
1076 TypedMethodOptionMatcher* matcher = TypedMethodOptionMatcher::parse_method_pattern(line, error_buf, sizeof(error_buf));
1077 if (matcher == nullptr) {
1078 print_parse_error(error_buf, original.get());
1079 return false;
1080 }
1081 skip_whitespace(line);
1082 if (*line == '\0') {
1083 if (option2type(option) == OptionType::Bool) {
1084 // if this is a bool option this implies true
1085 if (!register_command(matcher, option, error_buf, sizeof(error_buf), true)) {
1086 print_parse_error(error_buf, original.get());
1087 return false;
1088 }
1089 return true;
1090 } else if (option == CompileCommandEnum::MemStat) {
1091 // MemStat default action is to collect data but to not print
1092 if (!register_command(matcher, option, error_buf, sizeof(error_buf), (uintx)MemStatAction::collect)) {
1093 print_parse_error(error_buf, original.get());
1094 return false;
1095 }
1096 return true;
1097 } else {
1098 jio_snprintf(error_buf, sizeof(error_buf), " Option '%s' is not followed by a value", option2name(option));
1099 print_parse_error(error_buf, original.get());
1100 return false;
1101 }
1102 }
1103 if (!scan_value(type, line, bytes_read, matcher, option, error_buf, sizeof(error_buf))) {
1104 print_parse_error(error_buf, original.get());
1105 return false;
1106 }
1107 assert(matcher != nullptr, "consistency");
1108 }
1109 return true;
1110 }
1111
1112 static const char* default_cc_file = ".hotspot_compiler";
1113
1114 static const char* cc_file() {
1115 #ifdef ASSERT
1116 if (CompileCommandFile == nullptr)
1117 return default_cc_file;
1118 #endif
1119 return CompileCommandFile;
1120 }
1121
1122 bool CompilerOracle::has_command_file() {
1123 return cc_file() != nullptr;
1124 }
1125
1126 bool CompilerOracle::_quiet = false;
1127
1128 bool CompilerOracle::parse_from_file() {
1129 assert(has_command_file(), "command file must be specified");
1130 FILE* stream = os::fopen(cc_file(), "rt");
1131 if (stream == nullptr) {
1132 return true;
1133 }
1134
1135 FileInput input(stream, /*need_close=*/ true);
1136 return parse_from_input(&input, parse_from_line);
1137 }
1138
1139 bool CompilerOracle::parse_from_input(inputStream::Input* input,
1140 CompilerOracle::
1141 parse_from_line_fn_t* parse_from_line) {
1142 bool success = true;
1143 for (inputStream in(input); !in.done(); in.next()) {
1144 if (!parse_from_line(in.current_line())) {
1145 success = false;
1146 }
1147 }
1148 return success;
1149 }
1150
1151 bool CompilerOracle::parse_from_string(const char* str,
1152 CompilerOracle::
1153 parse_from_line_fn_t* parse_from_line) {
1154 MemoryInput input(str, strlen(str));
1155 return parse_from_input(&input, parse_from_line);
1156 }
1157
1158 bool compilerOracle_init() {
1159 bool success = true;
1160 // Register default compile commands first - any commands specified via CompileCommand will
1161 // supersede these default commands.
1162 for (int i = 0; default_compile_commands[i] != nullptr; i ++) {
1163 char* s = os::strdup(default_compile_commands[i]);
1164 success = CompilerOracle::parse_from_line_quietly(s);
1165 os::free(s);
1166 assert(success, "default compile command \"%s\" failed to parse", default_compile_commands[i]);
1167 }
1168 if (!CompilerOracle::parse_from_string(CompileCommand, CompilerOracle::parse_from_line)) {
1169 success = false;
1170 }
1171 if (!CompilerOracle::parse_from_string(CompileOnly, CompilerOracle::parse_compile_only)) {
1172 success = false;
1173 }
1174 if (CompilerOracle::has_command_file()) {
1175 if (!CompilerOracle::parse_from_file()) {
1176 success = false;
1177 }
1178 } else {
1179 struct stat buf;
1180 if (os::stat(default_cc_file, &buf) == 0) {
1181 warning("%s file is present but has been ignored. "
1182 "Run with -XX:CompileCommandFile=%s to load the file.",
1183 default_cc_file, default_cc_file);
1184 }
1185 }
1186 if (has_command(CompileCommandEnum::Print)) {
1187 if (PrintAssembly) {
1188 warning("CompileCommand and/or %s file contains 'print' commands, but PrintAssembly is also enabled", default_cc_file);
1189 }
1190 }
1191 return success;
1192 }
1193
1194 bool CompilerOracle::parse_compile_only(char* line) {
1195 if (line[0] == '\0') {
1196 return true;
1197 }
1198 ResourceMark rm;
1199 char error_buf[1024] = {0};
1200 LineCopy original(line);
1201 char* method_pattern;
1202 do {
1203 if (line[0] == '\0') {
1204 break;
1205 }
1206 method_pattern = strtok_r(line, ",", &line);
1207 if (method_pattern != nullptr) {
1208 TypedMethodOptionMatcher* matcher = TypedMethodOptionMatcher::parse_method_pattern(method_pattern, error_buf, sizeof(error_buf));
1209 if (matcher != nullptr) {
1210 if (register_command(matcher, CompileCommandEnum::CompileOnly, error_buf, sizeof(error_buf), true)) {
1211 continue;
1212 }
1213 }
1214 }
1215 ttyLocker ttyl;
1216 tty->print_cr("CompileOnly: An error occurred during parsing");
1217 if (*error_buf != '\0') {
1218 tty->print_cr("Error: %s", error_buf);
1219 }
1220 tty->print_cr("Line: '%s'", original.get());
1221 return false;
1222 } while (method_pattern != nullptr && line != nullptr);
1223 return true;
1224 }
1225
1226 CompileCommandEnum CompilerOracle::string_to_option(const char* name) {
1227 int bytes_read = 0;
1228 char errorbuf[1024] = {0};
1229 return match_option_name(name, &bytes_read, errorbuf, sizeof(errorbuf));
1230 }