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* Simplify the implementation of `with'. This gives a 7% speedup in

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evaluating the NixOS system configuration.
This commit is contained in:
Eelco Dolstra 2010-04-22 15:08:09 +00:00
parent ee0384fb96
commit 0bc468f195
4 changed files with 15 additions and 30 deletions
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8
src/libexpr/nixexpr.cc
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@ -278,12 +278,12 @@ void ExprLet::bindVars(const StaticEnv & env)
void ExprWith::bindVars(const StaticEnv & env)
{
/* Does this `with' have an enclosing `with'? If so, record its
level so that we can copy the attributes of the enclosing
`with'. */
level so that `lookupVar' can look up variables in the previous
`with' if this one doesn't contain the desired attribute. */
const StaticEnv * curEnv;
unsigned int level;
prevWith = -1;
for (curEnv = &env, level = 0; curEnv; curEnv = curEnv->up, level++)
prevWith = 0;
for (curEnv = &env, level = 1; curEnv; curEnv = curEnv->up, level++)
if (curEnv->isWith) {
prevWith = level;
break;