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Minor module system evaluation speedups

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This gives about a 5% speedup.

Issue #8152.
This commit is contained in:
Eelco Dolstra 2015-07-28 14:41:36 +02:00
parent 0ca10a445a
commit 67b1a20f12
1 changed files with 25 additions and 22 deletions
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47
lib/modules.nix
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@ -264,43 +264,46 @@ rec {
defs' = (optional (opt ? default)
{ file = head opt.declarations; value = mkOptionDefault opt.default; }) ++ defs;
# Handle properties, check types, and merge everything together
inherit (mergeDefinitions loc opt.type defs') isDefined defsFinal mergedValue;
files = map (def: def.file) defsFinal;
merged =
if isDefined then mergedValue
else throw "The option `${showOption loc}' is used but not defined.";
# Handle properties, check types, and merge everything together.
res = mergeDefinitions loc opt.type defs';
# Check whether the option is defined, and apply the ‘apply’
# function to the merged value. This allows options to yield a
# value computed from the definitions.
value =
if !res.isDefined then
throw "The option `${showOption loc}' is used but not defined."
else if opt ? apply then
opt.apply res.mergedValue
else
res.mergedValue;
# Finally, apply the ‘apply’ function to the merged
# value. This allows options to yield a value computed
# from the definitions.
value = (opt.apply or id) merged;
in opt //
{ value = addErrorContext "while evaluating the option `${showOption loc}':" value;
definitions = map (def: def.value) defsFinal;
inherit isDefined files;
files = map (def: def.file) res.defsFinal;
inherit (res) isDefined;
};
# Merge definitions of a value of a given type.
mergeDefinitions = loc: type: defs: rec {
defsFinal =
let
# Process mkMerge and mkIf properties
processIfAndMerge = defs: concatMap (m:
# Process mkMerge and mkIf properties.
defs' = concatMap (m:
map (value: { inherit (m) file; inherit value; }) (dischargeProperties m.value)
) defs;
# Process mkOverride properties
processOverride = defs: filterOverrides defs;
# Process mkOverride properties.
defs'' = filterOverrides defs';
# Sort mkOrder properties
processOrder = defs:
# Sort mkOrder properties.
defs''' =
# Avoid sorting if we don't have to.
if any (def: def.value._type or "" == "order") defs
then sortProperties defs
else defs;
in
processOrder (processOverride (processIfAndMerge defs));
if any (def: def.value._type or "" == "order") defs''
then sortProperties defs''
else defs'';
in defs''';
# Type-check the remaining definitions, and merge them.
mergedValue = foldl' (res: def: