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Optimize empty sets

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This reduces the number of Bindings allocations by about 10%.
This commit is contained in:
Eelco Dolstra 2015-07-23 23:11:08 +02:00
parent 16c9935fa9
commit c8bb2371eb
3 changed files with 14 additions and 4 deletions
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4
src/libexpr/eval.hh
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@ -80,6 +80,8 @@ public:
path or to environment variables. */
bool restricted;
Value vEmptySet;
private:
SrcToStore srcToStore;
@ -227,7 +229,7 @@ public:
Bindings * allocBindings(Bindings::size_t capacity);
void mkList(Value & v, unsigned int length);
void mkAttrs(Value & v, unsigned int expected);
void mkAttrs(Value & v, unsigned int capacity);
void mkThunk_(Value & v, Expr * expr);
void mkPos(Value & v, Pos * pos);