BuildValue ExternalCommand::
getResultForOutput(Node* node, const BuildValue& value) {
// If the value was a failed or cancelled command, propagate the failure.
if (value.isFailedCommand() || value.isPropagatedFailureCommand() ||
value.isCancelledCommand())
return BuildValue::makeFailedInput();
if (value.isSkippedCommand())
return BuildValue::makeSkippedCommand();
// Otherwise, we should have a successful command -- return the actual
// result for the output.
assert(value.isSuccessfulCommand());
// If the node is virtual, the output is always a virtual input value.
//
// FIXME: Eliminate this, and make the build value array contain an array of
// build values.
auto buildNode = static_cast<BuildNode*>(node);
if (buildNode->isVirtual() && !buildNode->isCommandTimestamp()) {
return BuildValue::makeVirtualInput();
}
// Find the index of the output node.
//
// FIXME: This is O(N). We don't expect N to be large in practice, but it
// could be.
auto it = std::find(outputs.begin(), outputs.end(), node);
assert(it != outputs.end());
auto idx = it - outputs.begin();
assert(idx < value.getNumOutputs());
auto& info = value.getNthOutputInfo(idx);
if (info.isMissing())
return BuildValue::makeMissingOutput();
return BuildValue::makeExistingInput(info);
}
