BuildValue ExternalCommand::
getResultForOutput(Node* node, const BuildValue& value) {
// If the value was a failed or skipped command, propagate the failure.
if (value.isFailedCommand() || value.isSkippedCommand())
return BuildValue::makeFailedInput();
// 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.
if (static_cast<BuildNode*>(node)->isVirtual()) {
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);
}
bool ExternalCommand::canUpdateIfNewerWithResult(const BuildValue& result) {
// Unless `allowModifiedOutputs` is specified, we always need to update if
// ran.
if (!allowModifiedOutputs)
return false;
// If it was specified, then we can update if all of our outputs simply exist.
for (unsigned i = 0, e = result.getNumOutputs(); i != e; ++i) {
const FileInfo& outputInfo = result.getNthOutputInfo(i);
// If the output is missing, we need to rebuild.
if (outputInfo.isMissing())
return false;
}
return true;
}