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Slightly optimize listToAttrs

This commit is contained in:
Eelco Dolstra 2013-10-28 07:34:44 +01:00
parent 36e67ff16b
commit ea6bf0c21f
3 changed files with 10 additions and 9 deletions
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1
src/libexpr/eval.cc
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@ -136,6 +136,7 @@ EvalState::EvalState()
, sType(symbols.create("type"))
, sMeta(symbols.create("meta"))
, sName(symbols.create("name"))
, sValue(symbols.create("value"))
, sSystem(symbols.create("system"))
, sOverrides(symbols.create("__overrides"))
, sOutputs(symbols.create("outputs"))

2
src/libexpr/eval.hh
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@ -93,7 +93,7 @@ class EvalState
public:
SymbolTable symbols;
const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName,
const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName, sValue,
sSystem, sOverrides, sOutputs, sOutputName, sIgnoreNulls;
Symbol sDerivationNix;

16
src/libexpr/primops.cc
View File

@ -277,10 +277,10 @@ static void prim_tryEval(EvalState & state, Value * * args, Value & v)
state.mkAttrs(v, 2);
try {
state.forceValue(*args[0]);
v.attrs->push_back(Attr(state.symbols.create("value"), args[0]));
v.attrs->push_back(Attr(state.sValue, args[0]));
mkBool(*state.allocAttr(v, state.symbols.create("success")), true);
} catch (AssertionError & e) {
mkBool(*state.allocAttr(v, state.symbols.create("value")), false);
mkBool(*state.allocAttr(v, state.sValue), false);
mkBool(*state.allocAttr(v, state.symbols.create("success")), false);
}
v.attrs->sort();
@ -810,7 +810,8 @@ static void prim_removeAttrs(EvalState & state, Value * * args, Value & v)
/* Builds a set from a list specifying (name, value) pairs. To be
precise, a list [{name = "name1"; value = value1;} ... {name =
"nameN"; value = valueN;}] is transformed to {name1 = value1;
... nameN = valueN;}. */
... nameN = valueN;}. In case of duplicate occurences of the same
name, the first takes precedence. */
static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
{
state.forceList(*args[0]);
@ -828,16 +829,15 @@ static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
throw TypeError("`name' attribute missing in a call to `listToAttrs'");
string name = state.forceStringNoCtx(*j->value);
Bindings::iterator j2 = v2.attrs->find(state.symbols.create("value"));
if (j2 == v2.attrs->end())
throw TypeError("`value' attribute missing in a call to `listToAttrs'");
Symbol sym = state.symbols.create(name);
if (seen.find(sym) == seen.end()) {
Bindings::iterator j2 = v2.attrs->find(state.symbols.create(state.sValue));
if (j2 == v2.attrs->end())
throw TypeError("`value' attribute missing in a call to `listToAttrs'");
v.attrs->push_back(Attr(sym, j2->value, j2->pos));
seen.insert(sym);
}
/* !!! Throw an error if `name' already exists? */
}
v.attrs->sort();