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◆ main openmsx / src / input / RecordedCommand.cc
2.5 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "RecordedCommand.hh"
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#include "Scheduler.hh"
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#include "StateChange.hh"
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#include "StateChangeDistributor.hh"
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#include "TclObject.hh"
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#include "ScopedAssign.hh"
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#include "dynarray.hh"
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#include "serialize.hh"
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#include "serialize_stl.hh"
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#include "stl.hh"
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#include <ranges>
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#include <string>
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#include <vector>
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namespace openmsx {
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RecordedCommand::RecordedCommand(CommandController& commandController_,
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                                 StateChangeDistributor& stateChangeDistributor_,
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                                 Scheduler& scheduler_,
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                                 std::string_view name_)
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	: Command(commandController_, name_)
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	, stateChangeDistributor(stateChangeDistributor_)
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	, scheduler(scheduler_)
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	, currentResultObject(&dummyResultObject)
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{
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	stateChangeDistributor.registerListener(*this);
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}
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RecordedCommand::~RecordedCommand()
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{
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	stateChangeDistributor.unregisterListener(*this);
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}
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void RecordedCommand::execute(std::span<const TclObject> tokens, TclObject& result)
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{
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	auto time = scheduler.getCurrentTime();
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	if (needRecord(tokens)) {
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		ScopedAssign sa(currentResultObject, &result);
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		stateChangeDistributor.distributeNew<MSXCommandEvent>(time, tokens);
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	} else {
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		execute(tokens, result, time);
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	}
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}
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bool RecordedCommand::needRecord(std::span<const TclObject> /*tokens*/) const
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{
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	return true;
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}
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[[nodiscard]] static std::string_view getBaseName(std::string_view str)
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{
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	auto pos = str.rfind("::");
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	return (pos == std::string_view::npos) ? str : str.substr(pos + 2);
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}
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void RecordedCommand::signalStateChange(const StateChange& event)
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{
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	const auto* commandEvent = std::get_if<MSXCommandEvent>(&event);
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	if (!commandEvent) return;
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	const auto& tokens = commandEvent->getTokens();
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	if (getBaseName(tokens[0].getString()) != getName()) return;
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	if (needRecord(tokens)) {
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		execute(tokens, *currentResultObject, commandEvent->getTime());
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	} else {
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		// Normally this shouldn't happen. But it's possible in case
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		// we're replaying a replay file that has manual edits in the
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		// event log. It's crucial for security that we don't blindly
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		// execute such commands. We already only execute
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		// RecordedCommands, but we also need a strict check that
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		// only commands that would be recorded are also replayed.
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		// For example:
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		//   debug set_bp 0x0038 true {<some-arbitrary-Tcl-command>}
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		// The debug write/write_block commands should be recorded and
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		// replayed, but via the set_bp it would be possible to
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		// execute arbitrary Tcl code.
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	}
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}
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void RecordedCommand::stopReplay(EmuTime /*time*/) noexcept
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{
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	// nothing
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}
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} // namespace openmsx