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* Use a symbol table to represent identifiers and attribute names

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efficiently.  The symbol table ensures that there is only one copy
  of each symbol, thus allowing symbols to be compared efficiently
  using a pointer equality test.
This commit is contained in:
Eelco Dolstra 2010-04-13 12:25:42 +00:00
parent 10e8b1fd15
commit ac1e8f40d4
15 changed files with 228 additions and 101 deletions
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2
src/libexpr/attr-path.cc
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@ -45,7 +45,7 @@ void findAlongAttrPath(EvalState & state, const string & attrPath,
format("the expression selected by the selection path `%1%' should be an attribute set but is %2%")
% curPath % showType(v));
Bindings::iterator a = v.attrs->find(attr);
Bindings::iterator a = v.attrs->find(state.symbols.create(attr));
if (a == v.attrs->end())
throw Error(format("attribute `%1%' in selection path `%2%' not found") % attr % curPath);
v = a->second;