Method JVM

launcher/jvm_tooling.cpp:223–306

}

JVM::JVM() {
  std::string class_path = GetClassPath();

  std::vector<JavaVMOption> options;
  options.push_back(JavaVMOption{const_cast<char *>(class_path.c_str())});

#if !defined(__ANDROID__)
  // Set the maximum heap size to a value that is slightly smaller than
  // libFuzzer's default rss_limit_mb. This prevents erroneous oom reports.
  // Note: This approach is deprecated and only kept here for backwards
  //       compatibility. The new approach is to set -rss_limit_mb to a
  //       suitable value based on the JVM heap size when starting libFuzzer
  //       as part of the Jazzer driver.
  options.push_back(JavaVMOption{(char *)"-Xmx1800m"});
  // Preserve and emit stack trace information even on hot paths.
  // This may hurt performance, but also helps find flaky bugs.
  options.push_back(JavaVMOption{(char *)"-XX:-OmitStackTraceInFastThrow"});
  // Optimize GC for high throughput rather than low latency.
  options.push_back(JavaVMOption{(char *)"-XX:+UseParallelGC"});
  // CriticalJNINatives has been removed in JDK 18, EnableDynamicAgentLoading
  // has been added in JDK 9.
  options.push_back(JavaVMOption{(char *)"-XX:+IgnoreUnrecognizedVMOptions"});
  options.push_back(JavaVMOption{(char *)"-XX:+CriticalJNINatives"});
  options.push_back(JavaVMOption{(char *)"-XX:+EnableDynamicAgentLoading"});
#endif

  std::vector<std::string> java_opts_args;
  const char *java_opts = std::getenv("JAVA_OPTS");
  if (java_opts != nullptr) {
    // Mimic the behavior of the JVM when it sees JAVA_TOOL_OPTIONS.
    std::cerr << "Picked up JAVA_OPTS: " << java_opts << std::endl;

    java_opts_args = absl::StrSplit(java_opts, ' ');
    for (const std::string &java_opt : java_opts_args) {
      options.push_back(JavaVMOption{const_cast<char *>(java_opt.c_str())});
    }
  }

  // Add additional jvm options set through command line flags.
  // Keep the vectors in scope as they contain the strings backing the C strings
  // added to options.
  std::vector<std::string> jvm_args;
  if (!FLAGS_jvm_args.empty()) {
    jvm_args = splitEscaped(FLAGS_jvm_args);
    for (const auto &arg : jvm_args) {
      options.push_back(JavaVMOption{const_cast<char *>(arg.c_str())});
    }
  }

  std::vector<std::string> additional_jvm_args;
  if (!FLAGS_additional_jvm_args.empty()) {
    additional_jvm_args = splitEscaped(FLAGS_additional_jvm_args);
    for (const auto &arg : additional_jvm_args) {
      options.push_back(JavaVMOption{const_cast<char *>(arg.c_str())});
    }
  }

#if !defined(__ANDROID__)