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third_party/crashpad/crashpad/tools/mac/catch_exception_tool.cc

Index: third_party/crashpad/crashpad/tools/mac/catch_exception_tool.cc
diff --git a/third_party/crashpad/crashpad/tools/mac/catch_exception_tool.cc b/third_party/crashpad/crashpad/tools/mac/catch_exception_tool.cc
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index 0000000000000000000000000000000000000000..32c6aed20a13a79558ebb266a5a7003d8e139c00
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+++ b/third_party/crashpad/crashpad/tools/mac/catch_exception_tool.cc
@@ -0,0 +1,327 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <getopt.h>
+#include <libgen.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+#include "base/files/scoped_file.h"
+#include "base/logging.h"
+#include "base/mac/mach_logging.h"
+#include "tools/tool_support.h"
+#include "util/mach/exc_server_variants.h"
+#include "util/mach/exception_behaviors.h"
+#include "util/mach/exception_types.h"
+#include "util/mach/mach_extensions.h"
+#include "util/mach/mach_message.h"
+#include "util/mach/mach_message_server.h"
+#include "util/mach/symbolic_constants_mach.h"
+#include "util/posix/symbolic_constants_posix.h"
+#include "util/stdlib/string_number_conversion.h"
+
+namespace crashpad {
+namespace {
+
+struct Options {
+  std::string file_path;
+  std::string mach_service;
+  FILE* file;
+  int timeout_secs;
+  bool has_timeout;
+  MachMessageServer::Persistent persistent;
+};
+
+class ExceptionServer : public UniversalMachExcServer::Interface {
+ public:
+  ExceptionServer(const Options& options,
+                  const std::string& me,
+                  int* exceptions_handled)
+      : UniversalMachExcServer::Interface(),
+        options_(options),
+        me_(me),
+        exceptions_handled_(exceptions_handled) {}
+
+  // UniversalMachExcServer::Interface:
+  virtual kern_return_t CatchMachException(
+      exception_behavior_t behavior,
+      exception_handler_t exception_port,
+      thread_t thread,
+      task_t task,
+      exception_type_t exception,
+      const mach_exception_data_type_t* code,
+      mach_msg_type_number_t code_count,
+      thread_state_flavor_t* flavor,
+      ConstThreadState old_state,
+      mach_msg_type_number_t old_state_count,
+      thread_state_t new_state,
+      mach_msg_type_number_t* new_state_count,
+      const mach_msg_trailer_t* trailer,
+      bool* destroy_complex_request) override {
+    *destroy_complex_request = true;
+    ++*exceptions_handled_;
+
+    fprintf(options_.file,
+            "%s: behavior %s",
+            me_.c_str(),
+            ExceptionBehaviorToString(
+                behavior, kUseFullName | kUnknownIsNumeric | kUseOr).c_str());
+
+    kern_return_t kr;
+    if (ExceptionBehaviorHasIdentity(behavior)) {
+      // It’s not possible to call pid_for_task() once EXC_CORPSE_NOTIFY has
+      // been generated. It is possible to obtain the process ID by mapping the
+      // corpse kcdata area from the task’s address space at code[0] (size
+      // code[1]) and locating TASK_CRASHINFO_PID within that area. This area
+      // also includes TASK_CRASHINFO_CRASHED_THREADID which could be used
+      // instead of thread_info() below, and TASK_CRASHINFO_EXCEPTION_CODES
+      // which could be used to recover the exception codes passed to the
+      // EXC_CRASH handler. None of this is currently done because corpses are a
+      // new 10.11-only feature. See 10.11 <corpses/task_corpse.h> and
+      // <kern/kern_cdata.h>.
+      if (exception != EXC_CORPSE_NOTIFY) {
+        pid_t pid;
+        kr = pid_for_task(task, &pid);
+        if (kr != KERN_SUCCESS) {
+          fprintf(options_.file, "\n");
+          fflush(options_.file);
+          MACH_LOG(ERROR, kr) << "pid_for_task";
+          return KERN_FAILURE;
+        }
+        fprintf(options_.file, ", pid %d", pid);
+      }
+
+      thread_identifier_info identifier_info;
+      mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
+      kr = thread_info(thread,
+                       THREAD_IDENTIFIER_INFO,
+                       reinterpret_cast<thread_info_t>(&identifier_info),
+                       &count);
+      if (kr != KERN_SUCCESS) {
+        fprintf(options_.file, "\n");
+        fflush(options_.file);
+        MACH_LOG(ERROR, kr) << "thread_info";
+        return KERN_FAILURE;
+      }
+      fprintf(options_.file, ", thread %lld", identifier_info.thread_id);
+    }
+
+    fprintf(
+        options_.file,
+        ", exception %s, codes[%d]",
+        ExceptionToString(exception, kUseFullName | kUnknownIsNumeric).c_str(),
+        code_count);
+
+    for (size_t index = 0; index < code_count; ++index) {
+      fprintf(options_.file,
+              "%s %#llx",
+              index != 0 ? "," : "",
+              code[index]);
+    }
+
+    if (exception == EXC_CRASH) {
+      mach_exception_code_t original_code_0;
+      int signal;
+      exception_type_t original_exception =
+          ExcCrashRecoverOriginalException(code[0], &original_code_0, &signal);
+      fprintf(options_.file,
+              ", original exception %s, original code[0] %lld, signal %s",
+              ExceptionToString(original_exception,
+                                kUseFullName | kUnknownIsNumeric).c_str(),
+              original_code_0,
+              SignalToString(signal, kUseFullName | kUnknownIsNumeric).c_str());
+    }
+
+    if (ExceptionBehaviorHasState(behavior)) {
+      std::string flavor_string =
+          ThreadStateFlavorToString(*flavor, kUseFullName | kUnknownIsNumeric);
+      fprintf(options_.file,
+              ", flavor %s, old_state_count %d",
+              flavor_string.c_str(),
+              old_state_count);
+    }
+
+    fprintf(options_.file, "\n");
+    fflush(options_.file);
+
+    if (exception != EXC_CRASH && exception != kMachExceptionSimulated) {
+      // Find another handler.
+      return KERN_FAILURE;
+    }
+
+    ExcServerCopyState(
+        behavior, old_state, old_state_count, new_state, new_state_count);
+
+    return ExcServerSuccessfulReturnValue(exception, behavior, false);
+  }
+
+ private:
+  const Options& options_;
+  const std::string& me_;
+  int* exceptions_handled_;
+};
+
+void Usage(const std::string& me) {
+  fprintf(stderr,
+"Usage: %s -m SERVICE [OPTION]...\n"
+"Catch Mach exceptions and display information about them.\n"
+"\n"
+"  -f, --file=FILE             append information to FILE instead of stdout\n"
+"  -m, --mach-service=SERVICE  register SERVICE with the bootstrap server\n"
+"  -p, --persistent            continue processing exceptions after the first\n"
+"  -t, --timeout=TIMEOUT       run for a maximum of TIMEOUT seconds\n"
+"      --help                  display this help and exit\n"
+"      --version               output version information and exit\n",
+          me.c_str());
+  ToolSupport::UsageTail(me);
+}
+
+int CatchExceptionToolMain(int argc, char* argv[]) {
+  const std::string me(basename(argv[0]));
+
+  enum OptionFlags {
+    // “Short” (single-character) options.
+    kOptionFile = 'f',
+    kOptionMachService = 'm',
+    kOptionPersistent = 'p',
+    kOptionTimeout = 't',
+
+    // Long options without short equivalents.
+    kOptionLastChar = 255,
+
+    // Standard options.
+    kOptionHelp = -2,
+    kOptionVersion = -3,
+  };
+
+  Options options = {};
+
+  const option long_options[] = {
+      {"file", required_argument, nullptr, kOptionFile},
+      {"mach-service", required_argument, nullptr, kOptionMachService},
+      {"persistent", no_argument, nullptr, kOptionPersistent},
+      {"timeout", required_argument, nullptr, kOptionTimeout},
+      {"help", no_argument, nullptr, kOptionHelp},
+      {"version", no_argument, nullptr, kOptionVersion},
+      {nullptr, 0, nullptr, 0},
+  };
+
+  int opt;
+  while ((opt = getopt_long(argc, argv, "f:m:pt:", long_options, nullptr)) !=
+         -1) {
+    switch (opt) {
+      case kOptionFile:
+        options.file_path = optarg;
+        break;
+      case kOptionMachService:
+        options.mach_service = optarg;
+        break;
+      case kOptionPersistent:
+        options.persistent = MachMessageServer::kPersistent;
+        break;
+      case kOptionTimeout:
+        if (!StringToNumber(optarg, &options.timeout_secs) ||
+            options.timeout_secs < 0) {
+          ToolSupport::UsageHint(me, "-t requires a zero or positive TIMEOUT");
+          return EXIT_FAILURE;
+        }
+        options.has_timeout = true;
+        break;
+      case kOptionHelp:
+        Usage(me);
+        return EXIT_SUCCESS;
+      case kOptionVersion:
+        ToolSupport::Version(me);
+        return EXIT_SUCCESS;
+      default:
+        ToolSupport::UsageHint(me, nullptr);
+        return EXIT_FAILURE;
+    }
+  }
+  argc -= optind;
+  argv += optind;
+
+  if (options.mach_service.empty()) {
+    ToolSupport::UsageHint(me, "-m is required");
+    return EXIT_FAILURE;
+  }
+
+  base::mac::ScopedMachReceiveRight
+      service_port(BootstrapCheckIn(options.mach_service));
+  if (service_port == kMachPortNull) {
+    return EXIT_FAILURE;
+  }
+
+  base::ScopedFILE file_owner;
+  if (options.file_path.empty()) {
+    options.file = stdout;
+  } else {
+    file_owner.reset(fopen(options.file_path.c_str(), "a"));
+    if (!file_owner.get()) {
+      PLOG(ERROR) << "fopen " << options.file_path;
+      return EXIT_FAILURE;
+    }
+    options.file = file_owner.get();
+  }
+
+  int exceptions_handled = 0;
+  ExceptionServer exception_server(options, me, &exceptions_handled);
+  UniversalMachExcServer universal_mach_exc_server(&exception_server);
+
+  // Assume that if persistent mode has been requested, it’s desirable to ignore
+  // large messages and keep running.
+  MachMessageServer::ReceiveLarge receive_large =
+      (options.persistent == MachMessageServer::kPersistent)
+          ? MachMessageServer::kReceiveLargeIgnore
+          : MachMessageServer::kReceiveLargeError;
+
+  mach_msg_timeout_t timeout_ms;
+  if (!options.has_timeout) {
+    timeout_ms = kMachMessageTimeoutWaitIndefinitely;
+  } else if (options.timeout_secs == 0) {
+    timeout_ms = kMachMessageTimeoutNonblocking;
+  } else {
+    timeout_ms = options.timeout_secs * 1000;
+  }
+
+  mach_msg_return_t mr = MachMessageServer::Run(&universal_mach_exc_server,
+                                                service_port.get(),
+                                                MACH_MSG_OPTION_NONE,
+                                                options.persistent,
+                                                receive_large,
+                                                timeout_ms);
+  if (mr == MACH_RCV_TIMED_OUT && options.has_timeout && options.persistent &&
+      exceptions_handled) {
+    // This is not an error: when exiting on timeout during persistent
+    // processing and at least one exception was handled, it’s considered a
+    // success.
+  } else if (mr != MACH_MSG_SUCCESS) {
+    MACH_LOG(ERROR, mr) << "MachMessageServer::Run";
+    return EXIT_FAILURE;
+  }
+
+  return EXIT_SUCCESS;
+}
+
+}  // namespace
+}  // namespace crashpad
+
+int main(int argc, char* argv[]) {
+  return crashpad::CatchExceptionToolMain(argc, argv);
+}