1 //===-- StructuredDataDarwinLog.cpp ---------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "StructuredDataDarwinLog.h" 10 11 #include <cstring> 12 13 #include <memory> 14 #include <sstream> 15 16 #include "lldb/Breakpoint/StoppointCallbackContext.h" 17 #include "lldb/Core/Debugger.h" 18 #include "lldb/Core/Module.h" 19 #include "lldb/Core/PluginManager.h" 20 #include "lldb/Host/OptionParser.h" 21 #include "lldb/Interpreter/CommandInterpreter.h" 22 #include "lldb/Interpreter/CommandObjectMultiword.h" 23 #include "lldb/Interpreter/CommandReturnObject.h" 24 #include "lldb/Interpreter/OptionArgParser.h" 25 #include "lldb/Interpreter/OptionValueProperties.h" 26 #include "lldb/Interpreter/OptionValueString.h" 27 #include "lldb/Interpreter/Property.h" 28 #include "lldb/Target/Process.h" 29 #include "lldb/Target/Target.h" 30 #include "lldb/Target/ThreadPlanCallOnFunctionExit.h" 31 #include "lldb/Utility/LLDBLog.h" 32 #include "lldb/Utility/Log.h" 33 #include "lldb/Utility/RegularExpression.h" 34 35 #define DARWIN_LOG_TYPE_VALUE "DarwinLog" 36 37 using namespace lldb; 38 using namespace lldb_private; 39 40 LLDB_PLUGIN_DEFINE(StructuredDataDarwinLog) 41 42 #pragma mark - 43 #pragma mark Anonymous Namespace 44 45 // Anonymous namespace 46 47 namespace sddarwinlog_private { 48 const uint64_t NANOS_PER_MICRO = 1000; 49 const uint64_t NANOS_PER_MILLI = NANOS_PER_MICRO * 1000; 50 const uint64_t NANOS_PER_SECOND = NANOS_PER_MILLI * 1000; 51 const uint64_t NANOS_PER_MINUTE = NANOS_PER_SECOND * 60; 52 const uint64_t NANOS_PER_HOUR = NANOS_PER_MINUTE * 60; 53 54 static bool DEFAULT_FILTER_FALLTHROUGH_ACCEPTS = true; 55 56 /// Global, sticky enable switch. If true, the user has explicitly 57 /// run the enable command. When a process launches or is attached to, 58 /// we will enable DarwinLog if either the settings for auto-enable is 59 /// on, or if the user had explicitly run enable at some point prior 60 /// to the launch/attach. 61 static bool s_is_explicitly_enabled; 62 63 class EnableOptions; 64 using EnableOptionsSP = std::shared_ptr<EnableOptions>; 65 66 using OptionsMap = 67 std::map<DebuggerWP, EnableOptionsSP, std::owner_less<DebuggerWP>>; 68 69 static OptionsMap &GetGlobalOptionsMap() { 70 static OptionsMap s_options_map; 71 return s_options_map; 72 } 73 74 static std::mutex &GetGlobalOptionsMapLock() { 75 static std::mutex s_options_map_lock; 76 return s_options_map_lock; 77 } 78 79 EnableOptionsSP GetGlobalEnableOptions(const DebuggerSP &debugger_sp) { 80 if (!debugger_sp) 81 return EnableOptionsSP(); 82 83 std::lock_guard<std::mutex> locker(GetGlobalOptionsMapLock()); 84 OptionsMap &options_map = GetGlobalOptionsMap(); 85 DebuggerWP debugger_wp(debugger_sp); 86 auto find_it = options_map.find(debugger_wp); 87 if (find_it != options_map.end()) 88 return find_it->second; 89 else 90 return EnableOptionsSP(); 91 } 92 93 void SetGlobalEnableOptions(const DebuggerSP &debugger_sp, 94 const EnableOptionsSP &options_sp) { 95 std::lock_guard<std::mutex> locker(GetGlobalOptionsMapLock()); 96 OptionsMap &options_map = GetGlobalOptionsMap(); 97 DebuggerWP debugger_wp(debugger_sp); 98 auto find_it = options_map.find(debugger_wp); 99 if (find_it != options_map.end()) 100 find_it->second = options_sp; 101 else 102 options_map.insert(std::make_pair(debugger_wp, options_sp)); 103 } 104 105 #pragma mark - 106 #pragma mark Settings Handling 107 108 /// Code to handle the StructuredDataDarwinLog settings 109 110 #define LLDB_PROPERTIES_darwinlog 111 #include "StructuredDataDarwinLogProperties.inc" 112 113 enum { 114 #define LLDB_PROPERTIES_darwinlog 115 #include "StructuredDataDarwinLogPropertiesEnum.inc" 116 }; 117 118 class StructuredDataDarwinLogProperties : public Properties { 119 public: 120 static ConstString &GetSettingName() { 121 static ConstString g_setting_name("darwin-log"); 122 return g_setting_name; 123 } 124 125 StructuredDataDarwinLogProperties() : Properties() { 126 m_collection_sp = std::make_shared<OptionValueProperties>(GetSettingName()); 127 m_collection_sp->Initialize(g_darwinlog_properties); 128 } 129 130 ~StructuredDataDarwinLogProperties() override = default; 131 132 bool GetEnableOnStartup() const { 133 const uint32_t idx = ePropertyEnableOnStartup; 134 return GetPropertyAtIndexAs<bool>( 135 idx, g_darwinlog_properties[idx].default_uint_value != 0); 136 } 137 138 llvm::StringRef GetAutoEnableOptions() const { 139 const uint32_t idx = ePropertyAutoEnableOptions; 140 return GetPropertyAtIndexAs<llvm::StringRef>( 141 idx, g_darwinlog_properties[idx].default_cstr_value); 142 } 143 144 const char *GetLoggingModuleName() const { return "libsystem_trace.dylib"; } 145 }; 146 147 static StructuredDataDarwinLogProperties &GetGlobalProperties() { 148 static StructuredDataDarwinLogProperties g_settings; 149 return g_settings; 150 } 151 152 const char *const s_filter_attributes[] = { 153 "activity", // current activity 154 "activity-chain", // entire activity chain, each level separated by ':' 155 "category", // category of the log message 156 "message", // message contents, fully expanded 157 "subsystem" // subsystem of the log message 158 159 // Consider implementing this action as it would be cheaper to filter. 160 // "message" requires always formatting the message, which is a waste of 161 // cycles if it ends up being rejected. "format", // format string 162 // used to format message text 163 }; 164 165 static llvm::StringRef GetDarwinLogTypeName() { 166 static constexpr llvm::StringLiteral s_key_name("DarwinLog"); 167 return s_key_name; 168 } 169 170 static llvm::StringRef GetLogEventType() { 171 static constexpr llvm::StringLiteral s_event_type("log"); 172 return s_event_type; 173 } 174 175 class FilterRule; 176 using FilterRuleSP = std::shared_ptr<FilterRule>; 177 178 class FilterRule { 179 public: 180 virtual ~FilterRule() = default; 181 182 using OperationCreationFunc = 183 std::function<FilterRuleSP(bool accept, size_t attribute_index, 184 const std::string &op_arg, Status &error)>; 185 186 static void RegisterOperation(ConstString operation, 187 const OperationCreationFunc &creation_func) { 188 GetCreationFuncMap().insert(std::make_pair(operation, creation_func)); 189 } 190 191 static FilterRuleSP CreateRule(bool match_accepts, size_t attribute, 192 ConstString operation, 193 const std::string &op_arg, Status &error) { 194 // Find the creation func for this type of filter rule. 195 auto map = GetCreationFuncMap(); 196 auto find_it = map.find(operation); 197 if (find_it == map.end()) { 198 error.SetErrorStringWithFormat("unknown filter operation \"" 199 "%s\"", 200 operation.GetCString()); 201 return FilterRuleSP(); 202 } 203 204 return find_it->second(match_accepts, attribute, op_arg, error); 205 } 206 207 StructuredData::ObjectSP Serialize() const { 208 StructuredData::Dictionary *dict_p = new StructuredData::Dictionary(); 209 210 // Indicate whether this is an accept or reject rule. 211 dict_p->AddBooleanItem("accept", m_accept); 212 213 // Indicate which attribute of the message this filter references. This can 214 // drop into the rule-specific DoSerialization if we get to the point where 215 // not all FilterRule derived classes work on an attribute. (e.g. logical 216 // and/or and other compound operations). 217 dict_p->AddStringItem("attribute", s_filter_attributes[m_attribute_index]); 218 219 // Indicate the type of the rule. 220 dict_p->AddStringItem("type", GetOperationType().GetCString()); 221 222 // Let the rule add its own specific details here. 223 DoSerialization(*dict_p); 224 225 return StructuredData::ObjectSP(dict_p); 226 } 227 228 virtual void Dump(Stream &stream) const = 0; 229 230 ConstString GetOperationType() const { return m_operation; } 231 232 protected: 233 FilterRule(bool accept, size_t attribute_index, ConstString operation) 234 : m_accept(accept), m_attribute_index(attribute_index), 235 m_operation(operation) {} 236 237 virtual void DoSerialization(StructuredData::Dictionary &dict) const = 0; 238 239 bool GetMatchAccepts() const { return m_accept; } 240 241 const char *GetFilterAttribute() const { 242 return s_filter_attributes[m_attribute_index]; 243 } 244 245 private: 246 using CreationFuncMap = std::map<ConstString, OperationCreationFunc>; 247 248 static CreationFuncMap &GetCreationFuncMap() { 249 static CreationFuncMap s_map; 250 return s_map; 251 } 252 253 const bool m_accept; 254 const size_t m_attribute_index; 255 const ConstString m_operation; 256 }; 257 258 using FilterRules = std::vector<FilterRuleSP>; 259 260 class RegexFilterRule : public FilterRule { 261 public: 262 static void RegisterOperation() { 263 FilterRule::RegisterOperation(StaticGetOperation(), CreateOperation); 264 } 265 266 void Dump(Stream &stream) const override { 267 stream.Printf("%s %s regex %s", GetMatchAccepts() ? "accept" : "reject", 268 GetFilterAttribute(), m_regex_text.c_str()); 269 } 270 271 protected: 272 void DoSerialization(StructuredData::Dictionary &dict) const override { 273 dict.AddStringItem("regex", m_regex_text); 274 } 275 276 private: 277 static FilterRuleSP CreateOperation(bool accept, size_t attribute_index, 278 const std::string &op_arg, 279 Status &error) { 280 // We treat the op_arg as a regex. Validate it. 281 if (op_arg.empty()) { 282 error.SetErrorString("regex filter type requires a regex " 283 "argument"); 284 return FilterRuleSP(); 285 } 286 287 // Instantiate the regex so we can report any errors. 288 auto regex = RegularExpression(op_arg); 289 if (llvm::Error err = regex.GetError()) { 290 error.SetErrorString(llvm::toString(std::move(err))); 291 return FilterRuleSP(); 292 } 293 294 // We passed all our checks, this appears fine. 295 error.Clear(); 296 return FilterRuleSP(new RegexFilterRule(accept, attribute_index, op_arg)); 297 } 298 299 static ConstString StaticGetOperation() { 300 static ConstString s_operation("regex"); 301 return s_operation; 302 } 303 304 RegexFilterRule(bool accept, size_t attribute_index, 305 const std::string ®ex_text) 306 : FilterRule(accept, attribute_index, StaticGetOperation()), 307 m_regex_text(regex_text) {} 308 309 const std::string m_regex_text; 310 }; 311 312 class ExactMatchFilterRule : public FilterRule { 313 public: 314 static void RegisterOperation() { 315 FilterRule::RegisterOperation(StaticGetOperation(), CreateOperation); 316 } 317 318 void Dump(Stream &stream) const override { 319 stream.Printf("%s %s match %s", GetMatchAccepts() ? "accept" : "reject", 320 GetFilterAttribute(), m_match_text.c_str()); 321 } 322 323 protected: 324 void DoSerialization(StructuredData::Dictionary &dict) const override { 325 dict.AddStringItem("exact_text", m_match_text); 326 } 327 328 private: 329 static FilterRuleSP CreateOperation(bool accept, size_t attribute_index, 330 const std::string &op_arg, 331 Status &error) { 332 if (op_arg.empty()) { 333 error.SetErrorString("exact match filter type requires an " 334 "argument containing the text that must " 335 "match the specified message attribute."); 336 return FilterRuleSP(); 337 } 338 339 error.Clear(); 340 return FilterRuleSP( 341 new ExactMatchFilterRule(accept, attribute_index, op_arg)); 342 } 343 344 static ConstString StaticGetOperation() { 345 static ConstString s_operation("match"); 346 return s_operation; 347 } 348 349 ExactMatchFilterRule(bool accept, size_t attribute_index, 350 const std::string &match_text) 351 : FilterRule(accept, attribute_index, StaticGetOperation()), 352 m_match_text(match_text) {} 353 354 const std::string m_match_text; 355 }; 356 357 static void RegisterFilterOperations() { 358 ExactMatchFilterRule::RegisterOperation(); 359 RegexFilterRule::RegisterOperation(); 360 } 361 362 // ========================================================================= 363 // Commands 364 // ========================================================================= 365 366 /// Provides the main on-off switch for enabling darwin logging. 367 /// 368 /// It is valid to run the enable command when logging is already enabled. 369 /// This resets the logging with whatever settings are currently set. 370 371 static constexpr OptionDefinition g_enable_option_table[] = { 372 // Source stream include/exclude options (the first-level filter). This one 373 // should be made as small as possible as everything that goes through here 374 // must be processed by the process monitor. 375 {LLDB_OPT_SET_ALL, false, "any-process", 'a', OptionParser::eNoArgument, 376 nullptr, {}, 0, eArgTypeNone, 377 "Specifies log messages from other related processes should be " 378 "included."}, 379 {LLDB_OPT_SET_ALL, false, "debug", 'd', OptionParser::eNoArgument, nullptr, 380 {}, 0, eArgTypeNone, 381 "Specifies debug-level log messages should be included. Specifying" 382 " --debug implies --info."}, 383 {LLDB_OPT_SET_ALL, false, "info", 'i', OptionParser::eNoArgument, nullptr, 384 {}, 0, eArgTypeNone, 385 "Specifies info-level log messages should be included."}, 386 {LLDB_OPT_SET_ALL, false, "filter", 'f', OptionParser::eRequiredArgument, 387 nullptr, {}, 0, eArgRawInput, 388 // There doesn't appear to be a great way for me to have these multi-line, 389 // formatted tables in help. This looks mostly right but there are extra 390 // linefeeds added at seemingly random spots, and indentation isn't 391 // handled properly on those lines. 392 "Appends a filter rule to the log message filter chain. Multiple " 393 "rules may be added by specifying this option multiple times, " 394 "once per filter rule. Filter rules are processed in the order " 395 "they are specified, with the --no-match-accepts setting used " 396 "for any message that doesn't match one of the rules.\n" 397 "\n" 398 " Filter spec format:\n" 399 "\n" 400 " --filter \"{action} {attribute} {op}\"\n" 401 "\n" 402 " {action} :=\n" 403 " accept |\n" 404 " reject\n" 405 "\n" 406 " {attribute} :=\n" 407 " activity | // message's most-derived activity\n" 408 " activity-chain | // message's {parent}:{child} activity\n" 409 " category | // message's category\n" 410 " message | // message's expanded contents\n" 411 " subsystem | // message's subsystem\n" 412 "\n" 413 " {op} :=\n" 414 " match {exact-match-text} |\n" 415 " regex {search-regex}\n" 416 "\n" 417 "The regex flavor used is the C++ std::regex ECMAScript format. " 418 "Prefer character classes like [[:digit:]] to \\d and the like, as " 419 "getting the backslashes escaped through properly is error-prone."}, 420 {LLDB_OPT_SET_ALL, false, "live-stream", 'l', 421 OptionParser::eRequiredArgument, nullptr, {}, 0, eArgTypeBoolean, 422 "Specify whether logging events are live-streamed or buffered. " 423 "True indicates live streaming, false indicates buffered. The " 424 "default is true (live streaming). Live streaming will deliver " 425 "log messages with less delay, but buffered capture mode has less " 426 "of an observer effect."}, 427 {LLDB_OPT_SET_ALL, false, "no-match-accepts", 'n', 428 OptionParser::eRequiredArgument, nullptr, {}, 0, eArgTypeBoolean, 429 "Specify whether a log message that doesn't match any filter rule " 430 "is accepted or rejected, where true indicates accept. The " 431 "default is true."}, 432 {LLDB_OPT_SET_ALL, false, "echo-to-stderr", 'e', 433 OptionParser::eRequiredArgument, nullptr, {}, 0, eArgTypeBoolean, 434 "Specify whether os_log()/NSLog() messages are echoed to the " 435 "target program's stderr. When DarwinLog is enabled, we shut off " 436 "the mirroring of os_log()/NSLog() to the program's stderr. " 437 "Setting this flag to true will restore the stderr mirroring." 438 "The default is false."}, 439 {LLDB_OPT_SET_ALL, false, "broadcast-events", 'b', 440 OptionParser::eRequiredArgument, nullptr, {}, 0, eArgTypeBoolean, 441 "Specify if the plugin should broadcast events. Broadcasting " 442 "log events is a requirement for displaying the log entries in " 443 "LLDB command-line. It is also required if LLDB clients want to " 444 "process log events. The default is true."}, 445 // Message formatting options 446 {LLDB_OPT_SET_ALL, false, "timestamp-relative", 'r', 447 OptionParser::eNoArgument, nullptr, {}, 0, eArgTypeNone, 448 "Include timestamp in the message header when printing a log " 449 "message. The timestamp is relative to the first displayed " 450 "message."}, 451 {LLDB_OPT_SET_ALL, false, "subsystem", 's', OptionParser::eNoArgument, 452 nullptr, {}, 0, eArgTypeNone, 453 "Include the subsystem in the message header when displaying " 454 "a log message."}, 455 {LLDB_OPT_SET_ALL, false, "category", 'c', OptionParser::eNoArgument, 456 nullptr, {}, 0, eArgTypeNone, 457 "Include the category in the message header when displaying " 458 "a log message."}, 459 {LLDB_OPT_SET_ALL, false, "activity-chain", 'C', OptionParser::eNoArgument, 460 nullptr, {}, 0, eArgTypeNone, 461 "Include the activity parent-child chain in the message header " 462 "when displaying a log message. The activity hierarchy is " 463 "displayed as {grandparent-activity}:" 464 "{parent-activity}:{activity}[:...]."}, 465 {LLDB_OPT_SET_ALL, false, "all-fields", 'A', OptionParser::eNoArgument, 466 nullptr, {}, 0, eArgTypeNone, 467 "Shortcut to specify that all header fields should be displayed."}}; 468 469 class EnableOptions : public Options { 470 public: 471 EnableOptions() 472 : Options(), 473 m_filter_fall_through_accepts(DEFAULT_FILTER_FALLTHROUGH_ACCEPTS), 474 m_filter_rules() {} 475 476 void OptionParsingStarting(ExecutionContext *execution_context) override { 477 m_include_debug_level = false; 478 m_include_info_level = false; 479 m_include_any_process = false; 480 m_filter_fall_through_accepts = DEFAULT_FILTER_FALLTHROUGH_ACCEPTS; 481 m_echo_to_stderr = false; 482 m_display_timestamp_relative = false; 483 m_display_subsystem = false; 484 m_display_category = false; 485 m_display_activity_chain = false; 486 m_broadcast_events = true; 487 m_live_stream = true; 488 m_filter_rules.clear(); 489 } 490 491 Status SetOptionValue(uint32_t option_idx, llvm::StringRef option_arg, 492 ExecutionContext *execution_context) override { 493 Status error; 494 495 const int short_option = m_getopt_table[option_idx].val; 496 switch (short_option) { 497 case 'a': 498 m_include_any_process = true; 499 break; 500 501 case 'A': 502 m_display_timestamp_relative = true; 503 m_display_category = true; 504 m_display_subsystem = true; 505 m_display_activity_chain = true; 506 break; 507 508 case 'b': 509 m_broadcast_events = 510 OptionArgParser::ToBoolean(option_arg, true, nullptr); 511 break; 512 513 case 'c': 514 m_display_category = true; 515 break; 516 517 case 'C': 518 m_display_activity_chain = true; 519 break; 520 521 case 'd': 522 m_include_debug_level = true; 523 break; 524 525 case 'e': 526 m_echo_to_stderr = OptionArgParser::ToBoolean(option_arg, false, nullptr); 527 break; 528 529 case 'f': 530 return ParseFilterRule(option_arg); 531 532 case 'i': 533 m_include_info_level = true; 534 break; 535 536 case 'l': 537 m_live_stream = OptionArgParser::ToBoolean(option_arg, false, nullptr); 538 break; 539 540 case 'n': 541 m_filter_fall_through_accepts = 542 OptionArgParser::ToBoolean(option_arg, true, nullptr); 543 break; 544 545 case 'r': 546 m_display_timestamp_relative = true; 547 break; 548 549 case 's': 550 m_display_subsystem = true; 551 break; 552 553 default: 554 error.SetErrorStringWithFormat("unsupported option '%c'", short_option); 555 } 556 return error; 557 } 558 559 llvm::ArrayRef<OptionDefinition> GetDefinitions() override { 560 return llvm::ArrayRef(g_enable_option_table); 561 } 562 563 StructuredData::DictionarySP BuildConfigurationData(bool enabled) { 564 StructuredData::DictionarySP config_sp(new StructuredData::Dictionary()); 565 566 // Set the basic enabled state. 567 config_sp->AddBooleanItem("enabled", enabled); 568 569 // If we're disabled, there's nothing more to add. 570 if (!enabled) 571 return config_sp; 572 573 // Handle source stream flags. 574 auto source_flags_sp = 575 StructuredData::DictionarySP(new StructuredData::Dictionary()); 576 config_sp->AddItem("source-flags", source_flags_sp); 577 578 source_flags_sp->AddBooleanItem("any-process", m_include_any_process); 579 source_flags_sp->AddBooleanItem("debug-level", m_include_debug_level); 580 // The debug-level flag, if set, implies info-level. 581 source_flags_sp->AddBooleanItem("info-level", m_include_info_level || 582 m_include_debug_level); 583 source_flags_sp->AddBooleanItem("live-stream", m_live_stream); 584 585 // Specify default filter rule (the fall-through) 586 config_sp->AddBooleanItem("filter-fall-through-accepts", 587 m_filter_fall_through_accepts); 588 589 // Handle filter rules 590 if (!m_filter_rules.empty()) { 591 auto json_filter_rules_sp = 592 StructuredData::ArraySP(new StructuredData::Array); 593 config_sp->AddItem("filter-rules", json_filter_rules_sp); 594 for (auto &rule_sp : m_filter_rules) { 595 if (!rule_sp) 596 continue; 597 json_filter_rules_sp->AddItem(rule_sp->Serialize()); 598 } 599 } 600 return config_sp; 601 } 602 603 bool GetIncludeDebugLevel() const { return m_include_debug_level; } 604 605 bool GetIncludeInfoLevel() const { 606 // Specifying debug level implies info level. 607 return m_include_info_level || m_include_debug_level; 608 } 609 610 const FilterRules &GetFilterRules() const { return m_filter_rules; } 611 612 bool GetFallthroughAccepts() const { return m_filter_fall_through_accepts; } 613 614 bool GetEchoToStdErr() const { return m_echo_to_stderr; } 615 616 bool GetDisplayTimestampRelative() const { 617 return m_display_timestamp_relative; 618 } 619 620 bool GetDisplaySubsystem() const { return m_display_subsystem; } 621 bool GetDisplayCategory() const { return m_display_category; } 622 bool GetDisplayActivityChain() const { return m_display_activity_chain; } 623 624 bool GetDisplayAnyHeaderFields() const { 625 return m_display_timestamp_relative || m_display_activity_chain || 626 m_display_subsystem || m_display_category; 627 } 628 629 bool GetBroadcastEvents() const { return m_broadcast_events; } 630 631 private: 632 Status ParseFilterRule(llvm::StringRef rule_text) { 633 Status error; 634 635 if (rule_text.empty()) { 636 error.SetErrorString("invalid rule_text"); 637 return error; 638 } 639 640 // filter spec format: 641 // 642 // {action} {attribute} {op} 643 // 644 // {action} := 645 // accept | 646 // reject 647 // 648 // {attribute} := 649 // category | 650 // subsystem | 651 // activity | 652 // activity-chain | 653 // message | 654 // format 655 // 656 // {op} := 657 // match {exact-match-text} | 658 // regex {search-regex} 659 660 // Parse action. 661 auto action_end_pos = rule_text.find(' '); 662 if (action_end_pos == std::string::npos) { 663 error.SetErrorStringWithFormat("could not parse filter rule " 664 "action from \"%s\"", 665 rule_text.str().c_str()); 666 return error; 667 } 668 auto action = rule_text.substr(0, action_end_pos); 669 bool accept; 670 if (action == "accept") 671 accept = true; 672 else if (action == "reject") 673 accept = false; 674 else { 675 error.SetErrorString("filter action must be \"accept\" or \"deny\""); 676 return error; 677 } 678 679 // parse attribute 680 auto attribute_end_pos = rule_text.find(" ", action_end_pos + 1); 681 if (attribute_end_pos == std::string::npos) { 682 error.SetErrorStringWithFormat("could not parse filter rule " 683 "attribute from \"%s\"", 684 rule_text.str().c_str()); 685 return error; 686 } 687 auto attribute = rule_text.substr(action_end_pos + 1, 688 attribute_end_pos - (action_end_pos + 1)); 689 auto attribute_index = MatchAttributeIndex(attribute); 690 if (attribute_index < 0) { 691 error.SetErrorStringWithFormat("filter rule attribute unknown: " 692 "%s", 693 attribute.str().c_str()); 694 return error; 695 } 696 697 // parse operation 698 auto operation_end_pos = rule_text.find(" ", attribute_end_pos + 1); 699 auto operation = rule_text.substr( 700 attribute_end_pos + 1, operation_end_pos - (attribute_end_pos + 1)); 701 702 // add filter spec 703 auto rule_sp = FilterRule::CreateRule( 704 accept, attribute_index, ConstString(operation), 705 std::string(rule_text.substr(operation_end_pos + 1)), error); 706 707 if (rule_sp && error.Success()) 708 m_filter_rules.push_back(rule_sp); 709 710 return error; 711 } 712 713 int MatchAttributeIndex(llvm::StringRef attribute_name) const { 714 for (const auto &Item : llvm::enumerate(s_filter_attributes)) { 715 if (attribute_name == Item.value()) 716 return Item.index(); 717 } 718 719 // We didn't match anything. 720 return -1; 721 } 722 723 bool m_include_debug_level = false; 724 bool m_include_info_level = false; 725 bool m_include_any_process = false; 726 bool m_filter_fall_through_accepts; 727 bool m_echo_to_stderr = false; 728 bool m_display_timestamp_relative = false; 729 bool m_display_subsystem = false; 730 bool m_display_category = false; 731 bool m_display_activity_chain = false; 732 bool m_broadcast_events = true; 733 bool m_live_stream = true; 734 FilterRules m_filter_rules; 735 }; 736 737 class EnableCommand : public CommandObjectParsed { 738 public: 739 EnableCommand(CommandInterpreter &interpreter, bool enable, const char *name, 740 const char *help, const char *syntax) 741 : CommandObjectParsed(interpreter, name, help, syntax), m_enable(enable), 742 m_options_sp(enable ? new EnableOptions() : nullptr) {} 743 744 protected: 745 void AppendStrictSourcesWarning(CommandReturnObject &result, 746 const char *source_name) { 747 if (!source_name) 748 return; 749 750 // Check if we're *not* using strict sources. If not, then the user is 751 // going to get debug-level info anyways, probably not what they're 752 // expecting. Unfortunately we can only fix this by adding an env var, 753 // which would have had to have happened already. Thus, a warning is the 754 // best we can do here. 755 StreamString stream; 756 stream.Printf("darwin-log source settings specify to exclude " 757 "%s messages, but setting " 758 "'plugin.structured-data.darwin-log." 759 "strict-sources' is disabled. This process will " 760 "automatically have %s messages included. Enable" 761 " the property and relaunch the target binary to have" 762 " these messages excluded.", 763 source_name, source_name); 764 result.AppendWarning(stream.GetString()); 765 } 766 767 bool DoExecute(Args &command, CommandReturnObject &result) override { 768 // First off, set the global sticky state of enable/disable based on this 769 // command execution. 770 s_is_explicitly_enabled = m_enable; 771 772 // Next, if this is an enable, save off the option data. We will need it 773 // later if a process hasn't been launched or attached yet. 774 if (m_enable) { 775 // Save off enabled configuration so we can apply these parsed options 776 // the next time an attach or launch occurs. 777 DebuggerSP debugger_sp = 778 GetCommandInterpreter().GetDebugger().shared_from_this(); 779 SetGlobalEnableOptions(debugger_sp, m_options_sp); 780 } 781 782 // Now check if we have a running process. If so, we should instruct the 783 // process monitor to enable/disable DarwinLog support now. 784 Target &target = GetSelectedOrDummyTarget(); 785 786 // Grab the active process. 787 auto process_sp = target.GetProcessSP(); 788 if (!process_sp) { 789 // No active process, so there is nothing more to do right now. 790 result.SetStatus(eReturnStatusSuccessFinishNoResult); 791 return true; 792 } 793 794 // If the process is no longer alive, we can't do this now. We'll catch it 795 // the next time the process is started up. 796 if (!process_sp->IsAlive()) { 797 result.SetStatus(eReturnStatusSuccessFinishNoResult); 798 return true; 799 } 800 801 // Get the plugin for the process. 802 auto plugin_sp = 803 process_sp->GetStructuredDataPlugin(GetDarwinLogTypeName()); 804 if (!plugin_sp || (plugin_sp->GetPluginName() != 805 StructuredDataDarwinLog::GetStaticPluginName())) { 806 result.AppendError("failed to get StructuredDataPlugin for " 807 "the process"); 808 } 809 StructuredDataDarwinLog &plugin = 810 *static_cast<StructuredDataDarwinLog *>(plugin_sp.get()); 811 812 if (m_enable) { 813 // Hook up the breakpoint for the process that detects when libtrace has 814 // been sufficiently initialized to really start the os_log stream. This 815 // is insurance to assure us that logging is really enabled. Requesting 816 // that logging be enabled for a process before libtrace is initialized 817 // results in a scenario where no errors occur, but no logging is 818 // captured, either. This step is to eliminate that possibility. 819 plugin.AddInitCompletionHook(*process_sp); 820 } 821 822 // Send configuration to the feature by way of the process. Construct the 823 // options we will use. 824 auto config_sp = m_options_sp->BuildConfigurationData(m_enable); 825 const Status error = 826 process_sp->ConfigureStructuredData(GetDarwinLogTypeName(), config_sp); 827 828 // Report results. 829 if (!error.Success()) { 830 result.AppendError(error.AsCString()); 831 // Our configuration failed, so we're definitely disabled. 832 plugin.SetEnabled(false); 833 } else { 834 result.SetStatus(eReturnStatusSuccessFinishNoResult); 835 // Our configuration succeeded, so we're enabled/disabled per whichever 836 // one this command is setup to do. 837 plugin.SetEnabled(m_enable); 838 } 839 return result.Succeeded(); 840 } 841 842 Options *GetOptions() override { 843 // We don't have options when this represents disable. 844 return m_enable ? m_options_sp.get() : nullptr; 845 } 846 847 private: 848 const bool m_enable; 849 EnableOptionsSP m_options_sp; 850 }; 851 852 /// Provides the status command. 853 class StatusCommand : public CommandObjectParsed { 854 public: 855 StatusCommand(CommandInterpreter &interpreter) 856 : CommandObjectParsed(interpreter, "status", 857 "Show whether Darwin log supported is available" 858 " and enabled.", 859 "plugin structured-data darwin-log status") {} 860 861 protected: 862 bool DoExecute(Args &command, CommandReturnObject &result) override { 863 auto &stream = result.GetOutputStream(); 864 865 // Figure out if we've got a process. If so, we can tell if DarwinLog is 866 // available for that process. 867 Target &target = GetSelectedOrDummyTarget(); 868 auto process_sp = target.GetProcessSP(); 869 if (!process_sp) { 870 stream.PutCString("Availability: unknown (requires process)\n"); 871 stream.PutCString("Enabled: not applicable " 872 "(requires process)\n"); 873 } else { 874 auto plugin_sp = 875 process_sp->GetStructuredDataPlugin(GetDarwinLogTypeName()); 876 stream.Printf("Availability: %s\n", 877 plugin_sp ? "available" : "unavailable"); 878 const bool enabled = 879 plugin_sp ? plugin_sp->GetEnabled( 880 StructuredDataDarwinLog::GetStaticPluginName()) 881 : false; 882 stream.Printf("Enabled: %s\n", enabled ? "true" : "false"); 883 } 884 885 // Display filter settings. 886 DebuggerSP debugger_sp = 887 GetCommandInterpreter().GetDebugger().shared_from_this(); 888 auto options_sp = GetGlobalEnableOptions(debugger_sp); 889 if (!options_sp) { 890 // Nothing more to do. 891 result.SetStatus(eReturnStatusSuccessFinishResult); 892 return true; 893 } 894 895 // Print filter rules 896 stream.PutCString("DarwinLog filter rules:\n"); 897 898 stream.IndentMore(); 899 900 if (options_sp->GetFilterRules().empty()) { 901 stream.Indent(); 902 stream.PutCString("none\n"); 903 } else { 904 // Print each of the filter rules. 905 int rule_number = 0; 906 for (auto rule_sp : options_sp->GetFilterRules()) { 907 ++rule_number; 908 if (!rule_sp) 909 continue; 910 911 stream.Indent(); 912 stream.Printf("%02d: ", rule_number); 913 rule_sp->Dump(stream); 914 stream.PutChar('\n'); 915 } 916 } 917 stream.IndentLess(); 918 919 // Print no-match handling. 920 stream.Indent(); 921 stream.Printf("no-match behavior: %s\n", 922 options_sp->GetFallthroughAccepts() ? "accept" : "reject"); 923 924 result.SetStatus(eReturnStatusSuccessFinishResult); 925 return true; 926 } 927 }; 928 929 /// Provides the darwin-log base command 930 class BaseCommand : public CommandObjectMultiword { 931 public: 932 BaseCommand(CommandInterpreter &interpreter) 933 : CommandObjectMultiword(interpreter, "plugin structured-data darwin-log", 934 "Commands for configuring Darwin os_log " 935 "support.", 936 "") { 937 // enable 938 auto enable_help = "Enable Darwin log collection, or re-enable " 939 "with modified configuration."; 940 auto enable_syntax = "plugin structured-data darwin-log enable"; 941 auto enable_cmd_sp = CommandObjectSP( 942 new EnableCommand(interpreter, 943 true, // enable 944 "enable", enable_help, enable_syntax)); 945 LoadSubCommand("enable", enable_cmd_sp); 946 947 // disable 948 auto disable_help = "Disable Darwin log collection."; 949 auto disable_syntax = "plugin structured-data darwin-log disable"; 950 auto disable_cmd_sp = CommandObjectSP( 951 new EnableCommand(interpreter, 952 false, // disable 953 "disable", disable_help, disable_syntax)); 954 LoadSubCommand("disable", disable_cmd_sp); 955 956 // status 957 auto status_cmd_sp = CommandObjectSP(new StatusCommand(interpreter)); 958 LoadSubCommand("status", status_cmd_sp); 959 } 960 }; 961 962 EnableOptionsSP ParseAutoEnableOptions(Status &error, Debugger &debugger) { 963 Log *log = GetLog(LLDBLog::Process); 964 // We are abusing the options data model here so that we can parse options 965 // without requiring the Debugger instance. 966 967 // We have an empty execution context at this point. We only want to parse 968 // options, and we don't need any context to do this here. In fact, we want 969 // to be able to parse the enable options before having any context. 970 ExecutionContext exe_ctx; 971 972 EnableOptionsSP options_sp(new EnableOptions()); 973 options_sp->NotifyOptionParsingStarting(&exe_ctx); 974 975 CommandReturnObject result(debugger.GetUseColor()); 976 977 // Parse the arguments. 978 auto options_property_sp = 979 debugger.GetPropertyValue(nullptr, 980 "plugin.structured-data.darwin-log." 981 "auto-enable-options", 982 error); 983 if (!error.Success()) 984 return EnableOptionsSP(); 985 if (!options_property_sp) { 986 error.SetErrorString("failed to find option setting for " 987 "plugin.structured-data.darwin-log."); 988 return EnableOptionsSP(); 989 } 990 991 const char *enable_options = 992 options_property_sp->GetAsString()->GetCurrentValue(); 993 Args args(enable_options); 994 if (args.GetArgumentCount() > 0) { 995 // Eliminate the initial '--' that would be required to set the settings 996 // that themselves include '-' and/or '--'. 997 const char *first_arg = args.GetArgumentAtIndex(0); 998 if (first_arg && (strcmp(first_arg, "--") == 0)) 999 args.Shift(); 1000 } 1001 1002 bool require_validation = false; 1003 llvm::Expected<Args> args_or = 1004 options_sp->Parse(args, &exe_ctx, PlatformSP(), require_validation); 1005 if (!args_or) { 1006 LLDB_LOG_ERROR( 1007 log, args_or.takeError(), 1008 "Parsing plugin.structured-data.darwin-log.auto-enable-options value " 1009 "failed: {0}"); 1010 return EnableOptionsSP(); 1011 } 1012 1013 if (!options_sp->VerifyOptions(result)) 1014 return EnableOptionsSP(); 1015 1016 // We successfully parsed and validated the options. 1017 return options_sp; 1018 } 1019 1020 bool RunEnableCommand(CommandInterpreter &interpreter) { 1021 StreamString command_stream; 1022 1023 command_stream << "plugin structured-data darwin-log enable"; 1024 auto enable_options = GetGlobalProperties().GetAutoEnableOptions(); 1025 if (!enable_options.empty()) { 1026 command_stream << ' '; 1027 command_stream << enable_options; 1028 } 1029 1030 // Run the command. 1031 CommandReturnObject return_object(interpreter.GetDebugger().GetUseColor()); 1032 interpreter.HandleCommand(command_stream.GetData(), eLazyBoolNo, 1033 return_object); 1034 return return_object.Succeeded(); 1035 } 1036 } 1037 using namespace sddarwinlog_private; 1038 1039 #pragma mark - 1040 #pragma mark Public static API 1041 1042 // Public static API 1043 1044 void StructuredDataDarwinLog::Initialize() { 1045 RegisterFilterOperations(); 1046 PluginManager::RegisterPlugin( 1047 GetStaticPluginName(), "Darwin os_log() and os_activity() support", 1048 &CreateInstance, &DebuggerInitialize, &FilterLaunchInfo); 1049 } 1050 1051 void StructuredDataDarwinLog::Terminate() { 1052 PluginManager::UnregisterPlugin(&CreateInstance); 1053 } 1054 1055 #pragma mark - 1056 #pragma mark StructuredDataPlugin API 1057 1058 // StructuredDataPlugin API 1059 1060 bool StructuredDataDarwinLog::SupportsStructuredDataType( 1061 llvm::StringRef type_name) { 1062 return type_name == GetDarwinLogTypeName(); 1063 } 1064 1065 void StructuredDataDarwinLog::HandleArrivalOfStructuredData( 1066 Process &process, llvm::StringRef type_name, 1067 const StructuredData::ObjectSP &object_sp) { 1068 Log *log = GetLog(LLDBLog::Process); 1069 if (log) { 1070 StreamString json_stream; 1071 if (object_sp) 1072 object_sp->Dump(json_stream); 1073 else 1074 json_stream.PutCString("<null>"); 1075 LLDB_LOGF(log, "StructuredDataDarwinLog::%s() called with json: %s", 1076 __FUNCTION__, json_stream.GetData()); 1077 } 1078 1079 // Ignore empty structured data. 1080 if (!object_sp) { 1081 LLDB_LOGF(log, 1082 "StructuredDataDarwinLog::%s() StructuredData object " 1083 "is null", 1084 __FUNCTION__); 1085 return; 1086 } 1087 1088 // Ignore any data that isn't for us. 1089 if (type_name != GetDarwinLogTypeName()) { 1090 LLDB_LOG(log, 1091 "StructuredData type expected to be {0} but was {1}, ignoring", 1092 GetDarwinLogTypeName(), type_name); 1093 return; 1094 } 1095 1096 // Broadcast the structured data event if we have that enabled. This is the 1097 // way that the outside world (all clients) get access to this data. This 1098 // plugin sets policy as to whether we do that. 1099 DebuggerSP debugger_sp = process.GetTarget().GetDebugger().shared_from_this(); 1100 auto options_sp = GetGlobalEnableOptions(debugger_sp); 1101 if (options_sp && options_sp->GetBroadcastEvents()) { 1102 LLDB_LOGF(log, "StructuredDataDarwinLog::%s() broadcasting event", 1103 __FUNCTION__); 1104 process.BroadcastStructuredData(object_sp, shared_from_this()); 1105 } 1106 1107 // Later, hang on to a configurable amount of these and allow commands to 1108 // inspect, including showing backtraces. 1109 } 1110 1111 static void SetErrorWithJSON(Status &error, const char *message, 1112 StructuredData::Object &object) { 1113 if (!message) { 1114 error.SetErrorString("Internal error: message not set."); 1115 return; 1116 } 1117 1118 StreamString object_stream; 1119 object.Dump(object_stream); 1120 object_stream.Flush(); 1121 1122 error.SetErrorStringWithFormat("%s: %s", message, object_stream.GetData()); 1123 } 1124 1125 Status StructuredDataDarwinLog::GetDescription( 1126 const StructuredData::ObjectSP &object_sp, lldb_private::Stream &stream) { 1127 Status error; 1128 1129 if (!object_sp) { 1130 error.SetErrorString("No structured data."); 1131 return error; 1132 } 1133 1134 // Log message payload objects will be dictionaries. 1135 const StructuredData::Dictionary *dictionary = object_sp->GetAsDictionary(); 1136 if (!dictionary) { 1137 SetErrorWithJSON(error, "Structured data should have been a dictionary " 1138 "but wasn't", 1139 *object_sp); 1140 return error; 1141 } 1142 1143 // Validate this is really a message for our plugin. 1144 llvm::StringRef type_name; 1145 if (!dictionary->GetValueForKeyAsString("type", type_name)) { 1146 SetErrorWithJSON(error, "Structured data doesn't contain mandatory " 1147 "type field", 1148 *object_sp); 1149 return error; 1150 } 1151 1152 if (type_name != GetDarwinLogTypeName()) { 1153 // This is okay - it simply means the data we received is not a log 1154 // message. We'll just format it as is. 1155 object_sp->Dump(stream); 1156 return error; 1157 } 1158 1159 // DarwinLog dictionaries store their data 1160 // in an array with key name "events". 1161 StructuredData::Array *events = nullptr; 1162 if (!dictionary->GetValueForKeyAsArray("events", events) || !events) { 1163 SetErrorWithJSON(error, "Log structured data is missing mandatory " 1164 "'events' field, expected to be an array", 1165 *object_sp); 1166 return error; 1167 } 1168 1169 events->ForEach( 1170 [&stream, &error, &object_sp, this](StructuredData::Object *object) { 1171 if (!object) { 1172 // Invalid. Stop iterating. 1173 SetErrorWithJSON(error, "Log event entry is null", *object_sp); 1174 return false; 1175 } 1176 1177 auto event = object->GetAsDictionary(); 1178 if (!event) { 1179 // Invalid, stop iterating. 1180 SetErrorWithJSON(error, "Log event is not a dictionary", *object_sp); 1181 return false; 1182 } 1183 1184 // If we haven't already grabbed the first timestamp value, do that 1185 // now. 1186 if (!m_recorded_first_timestamp) { 1187 uint64_t timestamp = 0; 1188 if (event->GetValueForKeyAsInteger("timestamp", timestamp)) { 1189 m_first_timestamp_seen = timestamp; 1190 m_recorded_first_timestamp = true; 1191 } 1192 } 1193 1194 HandleDisplayOfEvent(*event, stream); 1195 return true; 1196 }); 1197 1198 stream.Flush(); 1199 return error; 1200 } 1201 1202 bool StructuredDataDarwinLog::GetEnabled(llvm::StringRef type_name) const { 1203 if (type_name == GetStaticPluginName()) 1204 return m_is_enabled; 1205 return false; 1206 } 1207 1208 void StructuredDataDarwinLog::SetEnabled(bool enabled) { 1209 m_is_enabled = enabled; 1210 } 1211 1212 void StructuredDataDarwinLog::ModulesDidLoad(Process &process, 1213 ModuleList &module_list) { 1214 Log *log = GetLog(LLDBLog::Process); 1215 LLDB_LOGF(log, "StructuredDataDarwinLog::%s called (process uid %u)", 1216 __FUNCTION__, process.GetUniqueID()); 1217 1218 // Check if we should enable the darwin log support on startup/attach. 1219 if (!GetGlobalProperties().GetEnableOnStartup() && 1220 !s_is_explicitly_enabled) { 1221 // We're neither auto-enabled or explicitly enabled, so we shouldn't try to 1222 // enable here. 1223 LLDB_LOGF(log, 1224 "StructuredDataDarwinLog::%s not applicable, we're not " 1225 "enabled (process uid %u)", 1226 __FUNCTION__, process.GetUniqueID()); 1227 return; 1228 } 1229 1230 // If we already added the breakpoint, we've got nothing left to do. 1231 { 1232 std::lock_guard<std::mutex> locker(m_added_breakpoint_mutex); 1233 if (m_added_breakpoint) { 1234 LLDB_LOGF(log, 1235 "StructuredDataDarwinLog::%s process uid %u's " 1236 "post-libtrace-init breakpoint is already set", 1237 __FUNCTION__, process.GetUniqueID()); 1238 return; 1239 } 1240 } 1241 1242 // The logging support module name, specifies the name of the image name that 1243 // must be loaded into the debugged process before we can try to enable 1244 // logging. 1245 const char *logging_module_cstr = 1246 GetGlobalProperties().GetLoggingModuleName(); 1247 if (!logging_module_cstr || (logging_module_cstr[0] == 0)) { 1248 // We need this. Bail. 1249 LLDB_LOGF(log, 1250 "StructuredDataDarwinLog::%s no logging module name " 1251 "specified, we don't know where to set a breakpoint " 1252 "(process uid %u)", 1253 __FUNCTION__, process.GetUniqueID()); 1254 return; 1255 } 1256 1257 const ConstString logging_module_name = ConstString(logging_module_cstr); 1258 1259 // We need to see libtrace in the list of modules before we can enable 1260 // tracing for the target process. 1261 bool found_logging_support_module = false; 1262 for (size_t i = 0; i < module_list.GetSize(); ++i) { 1263 auto module_sp = module_list.GetModuleAtIndex(i); 1264 if (!module_sp) 1265 continue; 1266 1267 auto &file_spec = module_sp->GetFileSpec(); 1268 found_logging_support_module = 1269 (file_spec.GetFilename() == logging_module_name); 1270 if (found_logging_support_module) 1271 break; 1272 } 1273 1274 if (!found_logging_support_module) { 1275 LLDB_LOGF(log, 1276 "StructuredDataDarwinLog::%s logging module %s " 1277 "has not yet been loaded, can't set a breakpoint " 1278 "yet (process uid %u)", 1279 __FUNCTION__, logging_module_name.AsCString(), 1280 process.GetUniqueID()); 1281 return; 1282 } 1283 1284 // Time to enqueue the breakpoint so we can wait for logging support to be 1285 // initialized before we try to tap the libtrace stream. 1286 AddInitCompletionHook(process); 1287 LLDB_LOGF(log, 1288 "StructuredDataDarwinLog::%s post-init hook breakpoint " 1289 "set for logging module %s (process uid %u)", 1290 __FUNCTION__, logging_module_name.AsCString(), 1291 process.GetUniqueID()); 1292 1293 // We need to try the enable here as well, which will succeed in the event 1294 // that we're attaching to (rather than launching) the process and the 1295 // process is already past initialization time. In that case, the completion 1296 // breakpoint will never get hit and therefore won't start that way. It 1297 // doesn't hurt much beyond a bit of bandwidth if we end up doing this twice. 1298 // It hurts much more if we don't get the logging enabled when the user 1299 // expects it. 1300 EnableNow(); 1301 } 1302 1303 // public destructor 1304 1305 StructuredDataDarwinLog::~StructuredDataDarwinLog() { 1306 if (m_breakpoint_id != LLDB_INVALID_BREAK_ID) { 1307 ProcessSP process_sp(GetProcess()); 1308 if (process_sp) { 1309 process_sp->GetTarget().RemoveBreakpointByID(m_breakpoint_id); 1310 m_breakpoint_id = LLDB_INVALID_BREAK_ID; 1311 } 1312 } 1313 } 1314 1315 #pragma mark - 1316 #pragma mark Private instance methods 1317 1318 // Private constructors 1319 1320 StructuredDataDarwinLog::StructuredDataDarwinLog(const ProcessWP &process_wp) 1321 : StructuredDataPlugin(process_wp), m_recorded_first_timestamp(false), 1322 m_first_timestamp_seen(0), m_is_enabled(false), 1323 m_added_breakpoint_mutex(), m_added_breakpoint(), 1324 m_breakpoint_id(LLDB_INVALID_BREAK_ID) {} 1325 1326 // Private static methods 1327 1328 StructuredDataPluginSP 1329 StructuredDataDarwinLog::CreateInstance(Process &process) { 1330 // Currently only Apple targets support the os_log/os_activity protocol. 1331 if (process.GetTarget().GetArchitecture().GetTriple().getVendor() == 1332 llvm::Triple::VendorType::Apple) { 1333 auto process_wp = ProcessWP(process.shared_from_this()); 1334 return StructuredDataPluginSP(new StructuredDataDarwinLog(process_wp)); 1335 } else { 1336 return StructuredDataPluginSP(); 1337 } 1338 } 1339 1340 void StructuredDataDarwinLog::DebuggerInitialize(Debugger &debugger) { 1341 // Setup parent class first. 1342 StructuredDataPlugin::InitializeBasePluginForDebugger(debugger); 1343 1344 // Get parent command. 1345 auto &interpreter = debugger.GetCommandInterpreter(); 1346 llvm::StringRef parent_command_text = "plugin structured-data"; 1347 auto parent_command = 1348 interpreter.GetCommandObjectForCommand(parent_command_text); 1349 if (!parent_command) { 1350 // Ut oh, parent failed to create parent command. 1351 // TODO log 1352 return; 1353 } 1354 1355 auto command_name = "darwin-log"; 1356 auto command_sp = CommandObjectSP(new BaseCommand(interpreter)); 1357 bool result = parent_command->LoadSubCommand(command_name, command_sp); 1358 if (!result) { 1359 // TODO log it once we setup structured data logging 1360 } 1361 1362 if (!PluginManager::GetSettingForPlatformPlugin( 1363 debugger, StructuredDataDarwinLogProperties::GetSettingName())) { 1364 const bool is_global_setting = true; 1365 PluginManager::CreateSettingForStructuredDataPlugin( 1366 debugger, GetGlobalProperties().GetValueProperties(), 1367 "Properties for the darwin-log plug-in.", is_global_setting); 1368 } 1369 } 1370 1371 Status StructuredDataDarwinLog::FilterLaunchInfo(ProcessLaunchInfo &launch_info, 1372 Target *target) { 1373 Status error; 1374 1375 // If we're not debugging this launched process, there's nothing for us to do 1376 // here. 1377 if (!launch_info.GetFlags().AnySet(eLaunchFlagDebug)) 1378 return error; 1379 1380 // Darwin os_log() support automatically adds debug-level and info-level 1381 // messages when a debugger is attached to a process. However, with 1382 // integrated support for debugging built into the command-line LLDB, the 1383 // user may specifically set to *not* include debug-level and info-level 1384 // content. When the user is using the integrated log support, we want to 1385 // put the kabosh on that automatic adding of info and debug level. This is 1386 // done by adding an environment variable to the process on launch. (This 1387 // also means it is not possible to suppress this behavior if attaching to an 1388 // already-running app). 1389 // Log *log = GetLog(LLDBLog::Platform); 1390 1391 // If the target architecture is not one that supports DarwinLog, we have 1392 // nothing to do here. 1393 auto &triple = target ? target->GetArchitecture().GetTriple() 1394 : launch_info.GetArchitecture().GetTriple(); 1395 if (triple.getVendor() != llvm::Triple::Apple) { 1396 return error; 1397 } 1398 1399 // If DarwinLog is not enabled (either by explicit user command or via the 1400 // auto-enable option), then we have nothing to do. 1401 if (!GetGlobalProperties().GetEnableOnStartup() && 1402 !s_is_explicitly_enabled) { 1403 // Nothing to do, DarwinLog is not enabled. 1404 return error; 1405 } 1406 1407 // If we don't have parsed configuration info, that implies we have enable- 1408 // on-startup set up, but we haven't yet attempted to run the enable command. 1409 if (!target) { 1410 // We really can't do this without a target. We need to be able to get to 1411 // the debugger to get the proper options to do this right. 1412 // TODO log. 1413 error.SetErrorString("requires a target to auto-enable DarwinLog."); 1414 return error; 1415 } 1416 1417 DebuggerSP debugger_sp = target->GetDebugger().shared_from_this(); 1418 auto options_sp = GetGlobalEnableOptions(debugger_sp); 1419 if (!options_sp && debugger_sp) { 1420 options_sp = ParseAutoEnableOptions(error, *debugger_sp.get()); 1421 if (!options_sp || !error.Success()) 1422 return error; 1423 1424 // We already parsed the options, save them now so we don't generate them 1425 // again until the user runs the command manually. 1426 SetGlobalEnableOptions(debugger_sp, options_sp); 1427 } 1428 1429 if (!options_sp->GetEchoToStdErr()) { 1430 // The user doesn't want to see os_log/NSLog messages echo to stderr. That 1431 // mechanism is entirely separate from the DarwinLog support. By default we 1432 // don't want to get it via stderr, because that would be in duplicate of 1433 // the explicit log support here. 1434 1435 // Here we need to strip out any OS_ACTIVITY_DT_MODE setting to prevent 1436 // echoing of os_log()/NSLog() to stderr in the target program. 1437 launch_info.GetEnvironment().erase("OS_ACTIVITY_DT_MODE"); 1438 1439 // We will also set the env var that tells any downstream launcher from 1440 // adding OS_ACTIVITY_DT_MODE. 1441 launch_info.GetEnvironment()["IDE_DISABLED_OS_ACTIVITY_DT_MODE"] = "1"; 1442 } 1443 1444 // Set the OS_ACTIVITY_MODE env var appropriately to enable/disable debug and 1445 // info level messages. 1446 const char *env_var_value; 1447 if (options_sp->GetIncludeDebugLevel()) 1448 env_var_value = "debug"; 1449 else if (options_sp->GetIncludeInfoLevel()) 1450 env_var_value = "info"; 1451 else 1452 env_var_value = "default"; 1453 1454 launch_info.GetEnvironment()["OS_ACTIVITY_MODE"] = env_var_value; 1455 1456 return error; 1457 } 1458 1459 bool StructuredDataDarwinLog::InitCompletionHookCallback( 1460 void *baton, StoppointCallbackContext *context, lldb::user_id_t break_id, 1461 lldb::user_id_t break_loc_id) { 1462 // We hit the init function. We now want to enqueue our new thread plan, 1463 // which will in turn enqueue a StepOut thread plan. When the StepOut 1464 // finishes and control returns to our new thread plan, that is the time when 1465 // we can execute our logic to enable the logging support. 1466 1467 Log *log = GetLog(LLDBLog::Process); 1468 LLDB_LOGF(log, "StructuredDataDarwinLog::%s() called", __FUNCTION__); 1469 1470 // Get the current thread. 1471 if (!context) { 1472 LLDB_LOGF(log, 1473 "StructuredDataDarwinLog::%s() warning: no context, " 1474 "ignoring", 1475 __FUNCTION__); 1476 return false; 1477 } 1478 1479 // Get the plugin from the process. 1480 auto process_sp = context->exe_ctx_ref.GetProcessSP(); 1481 if (!process_sp) { 1482 LLDB_LOGF(log, 1483 "StructuredDataDarwinLog::%s() warning: invalid " 1484 "process in context, ignoring", 1485 __FUNCTION__); 1486 return false; 1487 } 1488 LLDB_LOGF(log, "StructuredDataDarwinLog::%s() call is for process uid %d", 1489 __FUNCTION__, process_sp->GetUniqueID()); 1490 1491 auto plugin_sp = process_sp->GetStructuredDataPlugin(GetDarwinLogTypeName()); 1492 if (!plugin_sp) { 1493 LLDB_LOG(log, "warning: no plugin for feature {0} in process uid {1}", 1494 GetDarwinLogTypeName(), process_sp->GetUniqueID()); 1495 return false; 1496 } 1497 1498 // Create the callback for when the thread plan completes. 1499 bool called_enable_method = false; 1500 const auto process_uid = process_sp->GetUniqueID(); 1501 1502 std::weak_ptr<StructuredDataPlugin> plugin_wp(plugin_sp); 1503 ThreadPlanCallOnFunctionExit::Callback callback = 1504 [plugin_wp, &called_enable_method, log, process_uid]() { 1505 LLDB_LOGF(log, 1506 "StructuredDataDarwinLog::post-init callback: " 1507 "called (process uid %u)", 1508 process_uid); 1509 1510 auto strong_plugin_sp = plugin_wp.lock(); 1511 if (!strong_plugin_sp) { 1512 LLDB_LOGF(log, 1513 "StructuredDataDarwinLog::post-init callback: " 1514 "plugin no longer exists, ignoring (process " 1515 "uid %u)", 1516 process_uid); 1517 return; 1518 } 1519 // Make sure we only call it once, just in case the thread plan hits 1520 // the breakpoint twice. 1521 if (!called_enable_method) { 1522 LLDB_LOGF(log, 1523 "StructuredDataDarwinLog::post-init callback: " 1524 "calling EnableNow() (process uid %u)", 1525 process_uid); 1526 static_cast<StructuredDataDarwinLog *>(strong_plugin_sp.get()) 1527 ->EnableNow(); 1528 called_enable_method = true; 1529 } else { 1530 // Our breakpoint was hit more than once. Unexpected but no harm 1531 // done. Log it. 1532 LLDB_LOGF(log, 1533 "StructuredDataDarwinLog::post-init callback: " 1534 "skipping EnableNow(), already called by " 1535 "callback [we hit this more than once] " 1536 "(process uid %u)", 1537 process_uid); 1538 } 1539 }; 1540 1541 // Grab the current thread. 1542 auto thread_sp = context->exe_ctx_ref.GetThreadSP(); 1543 if (!thread_sp) { 1544 LLDB_LOGF(log, 1545 "StructuredDataDarwinLog::%s() warning: failed to " 1546 "retrieve the current thread from the execution " 1547 "context, nowhere to run the thread plan (process uid " 1548 "%u)", 1549 __FUNCTION__, process_sp->GetUniqueID()); 1550 return false; 1551 } 1552 1553 // Queue the thread plan. 1554 auto thread_plan_sp = 1555 ThreadPlanSP(new ThreadPlanCallOnFunctionExit(*thread_sp, callback)); 1556 const bool abort_other_plans = false; 1557 thread_sp->QueueThreadPlan(thread_plan_sp, abort_other_plans); 1558 LLDB_LOGF(log, 1559 "StructuredDataDarwinLog::%s() queuing thread plan on " 1560 "trace library init method entry (process uid %u)", 1561 __FUNCTION__, process_sp->GetUniqueID()); 1562 1563 // We return false here to indicate that it isn't a public stop. 1564 return false; 1565 } 1566 1567 void StructuredDataDarwinLog::AddInitCompletionHook(Process &process) { 1568 Log *log = GetLog(LLDBLog::Process); 1569 LLDB_LOGF(log, "StructuredDataDarwinLog::%s() called (process uid %u)", 1570 __FUNCTION__, process.GetUniqueID()); 1571 1572 // Make sure we haven't already done this. 1573 { 1574 std::lock_guard<std::mutex> locker(m_added_breakpoint_mutex); 1575 if (m_added_breakpoint) { 1576 LLDB_LOGF(log, 1577 "StructuredDataDarwinLog::%s() ignoring request, " 1578 "breakpoint already set (process uid %u)", 1579 __FUNCTION__, process.GetUniqueID()); 1580 return; 1581 } 1582 1583 // We're about to do this, don't let anybody else try to do it. 1584 m_added_breakpoint = true; 1585 } 1586 1587 // Set a breakpoint for the process that will kick in when libtrace has 1588 // finished its initialization. 1589 Target &target = process.GetTarget(); 1590 1591 // Build up the module list. 1592 FileSpecList module_spec_list; 1593 auto module_file_spec = 1594 FileSpec(GetGlobalProperties().GetLoggingModuleName()); 1595 module_spec_list.Append(module_file_spec); 1596 1597 // We aren't specifying a source file set. 1598 FileSpecList *source_spec_list = nullptr; 1599 1600 const char *func_name = "_libtrace_init"; 1601 const lldb::addr_t offset = 0; 1602 const LazyBool skip_prologue = eLazyBoolCalculate; 1603 // This is an internal breakpoint - the user shouldn't see it. 1604 const bool internal = true; 1605 const bool hardware = false; 1606 1607 auto breakpoint_sp = target.CreateBreakpoint( 1608 &module_spec_list, source_spec_list, func_name, eFunctionNameTypeFull, 1609 eLanguageTypeC, offset, skip_prologue, internal, hardware); 1610 if (!breakpoint_sp) { 1611 // Huh? Bail here. 1612 LLDB_LOGF(log, 1613 "StructuredDataDarwinLog::%s() failed to set " 1614 "breakpoint in module %s, function %s (process uid %u)", 1615 __FUNCTION__, GetGlobalProperties().GetLoggingModuleName(), 1616 func_name, process.GetUniqueID()); 1617 return; 1618 } 1619 1620 // Set our callback. 1621 breakpoint_sp->SetCallback(InitCompletionHookCallback, nullptr); 1622 m_breakpoint_id = breakpoint_sp->GetID(); 1623 LLDB_LOGF(log, 1624 "StructuredDataDarwinLog::%s() breakpoint set in module %s," 1625 "function %s (process uid %u)", 1626 __FUNCTION__, GetGlobalProperties().GetLoggingModuleName(), 1627 func_name, process.GetUniqueID()); 1628 } 1629 1630 void StructuredDataDarwinLog::DumpTimestamp(Stream &stream, 1631 uint64_t timestamp) { 1632 const uint64_t delta_nanos = timestamp - m_first_timestamp_seen; 1633 1634 const uint64_t hours = delta_nanos / NANOS_PER_HOUR; 1635 uint64_t nanos_remaining = delta_nanos % NANOS_PER_HOUR; 1636 1637 const uint64_t minutes = nanos_remaining / NANOS_PER_MINUTE; 1638 nanos_remaining = nanos_remaining % NANOS_PER_MINUTE; 1639 1640 const uint64_t seconds = nanos_remaining / NANOS_PER_SECOND; 1641 nanos_remaining = nanos_remaining % NANOS_PER_SECOND; 1642 1643 stream.Printf("%02" PRIu64 ":%02" PRIu64 ":%02" PRIu64 ".%09" PRIu64, hours, 1644 minutes, seconds, nanos_remaining); 1645 } 1646 1647 size_t 1648 StructuredDataDarwinLog::DumpHeader(Stream &output_stream, 1649 const StructuredData::Dictionary &event) { 1650 StreamString stream; 1651 1652 ProcessSP process_sp = GetProcess(); 1653 if (!process_sp) { 1654 // TODO log 1655 return 0; 1656 } 1657 1658 DebuggerSP debugger_sp = 1659 process_sp->GetTarget().GetDebugger().shared_from_this(); 1660 if (!debugger_sp) { 1661 // TODO log 1662 return 0; 1663 } 1664 1665 auto options_sp = GetGlobalEnableOptions(debugger_sp); 1666 if (!options_sp) { 1667 // TODO log 1668 return 0; 1669 } 1670 1671 // Check if we should even display a header. 1672 if (!options_sp->GetDisplayAnyHeaderFields()) 1673 return 0; 1674 1675 stream.PutChar('['); 1676 1677 int header_count = 0; 1678 if (options_sp->GetDisplayTimestampRelative()) { 1679 uint64_t timestamp = 0; 1680 if (event.GetValueForKeyAsInteger("timestamp", timestamp)) { 1681 DumpTimestamp(stream, timestamp); 1682 ++header_count; 1683 } 1684 } 1685 1686 if (options_sp->GetDisplayActivityChain()) { 1687 llvm::StringRef activity_chain; 1688 if (event.GetValueForKeyAsString("activity-chain", activity_chain) && 1689 !activity_chain.empty()) { 1690 if (header_count > 0) 1691 stream.PutChar(','); 1692 1693 // Display the activity chain, from parent-most to child-most activity, 1694 // separated by a colon (:). 1695 stream.PutCString("activity-chain="); 1696 stream.PutCString(activity_chain); 1697 ++header_count; 1698 } 1699 } 1700 1701 if (options_sp->GetDisplaySubsystem()) { 1702 llvm::StringRef subsystem; 1703 if (event.GetValueForKeyAsString("subsystem", subsystem) && 1704 !subsystem.empty()) { 1705 if (header_count > 0) 1706 stream.PutChar(','); 1707 stream.PutCString("subsystem="); 1708 stream.PutCString(subsystem); 1709 ++header_count; 1710 } 1711 } 1712 1713 if (options_sp->GetDisplayCategory()) { 1714 llvm::StringRef category; 1715 if (event.GetValueForKeyAsString("category", category) && 1716 !category.empty()) { 1717 if (header_count > 0) 1718 stream.PutChar(','); 1719 stream.PutCString("category="); 1720 stream.PutCString(category); 1721 ++header_count; 1722 } 1723 } 1724 stream.PutCString("] "); 1725 1726 output_stream.PutCString(stream.GetString()); 1727 1728 return stream.GetSize(); 1729 } 1730 1731 size_t StructuredDataDarwinLog::HandleDisplayOfEvent( 1732 const StructuredData::Dictionary &event, Stream &stream) { 1733 // Check the type of the event. 1734 llvm::StringRef event_type; 1735 if (!event.GetValueForKeyAsString("type", event_type)) { 1736 // Hmm, we expected to get events that describe what they are. Continue 1737 // anyway. 1738 return 0; 1739 } 1740 1741 if (event_type != GetLogEventType()) 1742 return 0; 1743 1744 size_t total_bytes = 0; 1745 1746 // Grab the message content. 1747 llvm::StringRef message; 1748 if (!event.GetValueForKeyAsString("message", message)) 1749 return true; 1750 1751 // Display the log entry. 1752 const auto len = message.size(); 1753 1754 total_bytes += DumpHeader(stream, event); 1755 1756 stream.Write(message.data(), len); 1757 total_bytes += len; 1758 1759 // Add an end of line. 1760 stream.PutChar('\n'); 1761 total_bytes += sizeof(char); 1762 1763 return total_bytes; 1764 } 1765 1766 void StructuredDataDarwinLog::EnableNow() { 1767 Log *log = GetLog(LLDBLog::Process); 1768 LLDB_LOGF(log, "StructuredDataDarwinLog::%s() called", __FUNCTION__); 1769 1770 // Run the enable command. 1771 auto process_sp = GetProcess(); 1772 if (!process_sp) { 1773 // Nothing to do. 1774 LLDB_LOGF(log, 1775 "StructuredDataDarwinLog::%s() warning: failed to get " 1776 "valid process, skipping", 1777 __FUNCTION__); 1778 return; 1779 } 1780 LLDB_LOGF(log, "StructuredDataDarwinLog::%s() call is for process uid %u", 1781 __FUNCTION__, process_sp->GetUniqueID()); 1782 1783 // If we have configuration data, we can directly enable it now. Otherwise, 1784 // we need to run through the command interpreter to parse the auto-run 1785 // options (which is the only way we get here without having already-parsed 1786 // configuration data). 1787 DebuggerSP debugger_sp = 1788 process_sp->GetTarget().GetDebugger().shared_from_this(); 1789 if (!debugger_sp) { 1790 LLDB_LOGF(log, 1791 "StructuredDataDarwinLog::%s() warning: failed to get " 1792 "debugger shared pointer, skipping (process uid %u)", 1793 __FUNCTION__, process_sp->GetUniqueID()); 1794 return; 1795 } 1796 1797 auto options_sp = GetGlobalEnableOptions(debugger_sp); 1798 if (!options_sp) { 1799 // We haven't run the enable command yet. Just do that now, it'll take 1800 // care of the rest. 1801 auto &interpreter = debugger_sp->GetCommandInterpreter(); 1802 const bool success = RunEnableCommand(interpreter); 1803 if (log) { 1804 if (success) 1805 LLDB_LOGF(log, 1806 "StructuredDataDarwinLog::%s() ran enable command " 1807 "successfully for (process uid %u)", 1808 __FUNCTION__, process_sp->GetUniqueID()); 1809 else 1810 LLDB_LOGF(log, 1811 "StructuredDataDarwinLog::%s() error: running " 1812 "enable command failed (process uid %u)", 1813 __FUNCTION__, process_sp->GetUniqueID()); 1814 } 1815 Debugger::ReportError("failed to configure DarwinLog support", 1816 debugger_sp->GetID()); 1817 return; 1818 } 1819 1820 // We've previously been enabled. We will re-enable now with the previously 1821 // specified options. 1822 auto config_sp = options_sp->BuildConfigurationData(true); 1823 if (!config_sp) { 1824 LLDB_LOGF(log, 1825 "StructuredDataDarwinLog::%s() warning: failed to " 1826 "build configuration data for enable options, skipping " 1827 "(process uid %u)", 1828 __FUNCTION__, process_sp->GetUniqueID()); 1829 return; 1830 } 1831 1832 // We can run it directly. 1833 // Send configuration to the feature by way of the process. 1834 const Status error = 1835 process_sp->ConfigureStructuredData(GetDarwinLogTypeName(), config_sp); 1836 1837 // Report results. 1838 if (!error.Success()) { 1839 LLDB_LOGF(log, 1840 "StructuredDataDarwinLog::%s() " 1841 "ConfigureStructuredData() call failed " 1842 "(process uid %u): %s", 1843 __FUNCTION__, process_sp->GetUniqueID(), error.AsCString()); 1844 Debugger::ReportError("failed to configure DarwinLog support", 1845 debugger_sp->GetID()); 1846 m_is_enabled = false; 1847 } else { 1848 m_is_enabled = true; 1849 LLDB_LOGF(log, 1850 "StructuredDataDarwinLog::%s() success via direct " 1851 "configuration (process uid %u)", 1852 __FUNCTION__, process_sp->GetUniqueID()); 1853 } 1854 } 1855