8367149: Add ergonomic construction for creating ad-hoc VMErrorCallback

[xmas92]

Add a class OnVMError which uses the VMErrorCallback mechanism which is an ergonomic construction for creating ad-hoc VMErrorCallback which automatically calls the provided invocable f if a VM crash occurs within its lifetime. Can be used to instrument a build for more detailed contextual information gathering. Especially useful when hunting down intermittent bugs, or issues only reproducible in environments where access to a debugger is not readily available. Example use:

  {
    // Note the lambda is invoked after an error occurs within this thread,
    // and during on_error's lifetime. If state prior to the crash is required,
    // capture a copy of it first.
    auto important_value = get_the_value();

    OnVMError on_error([&](outputStream* st) {
      // Dump the important bits.
      st->print("Prior value: ");
      important_value.print_on(st);
      st->print("During crash: ")
      get_the_value().print_on(st);
      // Dump whole the whole state.
      this->print_on(st);
    });

    // Sometimes doing a thing will crash the VM.
    do_a_thing();
  }

C++17 class template argument deduction finally makes these sort of constructions ergonomic to use without the need for auto and helper construction methods.

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Progress

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Issue

• JDK-8367149: Add ergonomic construction for creating ad-hoc VMErrorCallback (Enhancement - P4)

Reviewers

• Albert Mingkun Yang (@albertnetymk - Reviewer) 🔄 Re-review required (review applies to a4ab0e3e)

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[openjdk]

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[mlbridge]

Webrevs

• 01: Full - Incremental (a4fb3397)
• 00: Full (a4ab0e3e)

[albertnetymk]

Minor comments/suggestions on the doc.

[albertnetymk]

// When VM crashes, the above lambda will be invoked and print relevant info.
might_cause_vm_crash();

[albertnetymk]

Does Ergonomic construction have specific meanings in cpp/this context? If not, I wonder if lightweight is clearer, as it is less technical.