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* When allocating an attribute set, reserve enough space for all

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elements.  This prevents the vector from having to resize itself.
This commit is contained in:
Eelco Dolstra 2010-10-24 20:09:37 +00:00
parent e0b7fb8f27
commit 43535499f3
4 changed files with 21 additions and 28 deletions
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23
src/libexpr/primops.cc
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@ -206,7 +206,7 @@ static void prim_addErrorContext(EvalState & state, Value * * args, Value & v)
* else => {success=false; value=false;} */
static void prim_tryEval(EvalState & state, Value * * args, Value & v)
{
state.mkAttrs(v);
state.mkAttrs(v, 2);
try {
state.forceValue(*args[0]);
v.attrs->push_back(Attr(state.symbols.create("value"), args[0]));
@ -484,7 +484,7 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
state.drvHashes[drvPath] = hashDerivationModulo(state, drv);
/* !!! assumes a single output */
state.mkAttrs(v);
state.mkAttrs(v, 2);
mkString(*state.allocAttr(v, state.sOutPath), outPath, singleton<PathSet>(drvPath));
mkString(*state.allocAttr(v, state.sDrvPath), drvPath, singleton<PathSet>("=" + drvPath));
v.attrs->sort();
@ -745,7 +745,7 @@ static void prim_removeAttrs(EvalState & state, Value * * args, Value & v)
/* Copy all attributes not in that set. Note that we don't need
to sort v.attrs because it's a subset of an already sorted
vector. */
state.mkAttrs(v);
state.mkAttrs(v, args[0]->attrs->size());
foreach (Bindings::iterator, i, *args[0]->attrs) {
if (names.find(i->name) == names.end())
v.attrs->push_back(*i);
@ -761,7 +761,7 @@ static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
{
state.forceList(*args[0]);
state.mkAttrs(v);
state.mkAttrs(v, args[0]->list.length);
std::set<Symbol> seen;
@ -798,7 +798,7 @@ static void prim_intersectAttrs(EvalState & state, Value * * args, Value & v)
state.forceAttrs(*args[0]);
state.forceAttrs(*args[1]);
state.mkAttrs(v);
state.mkAttrs(v, std::min(args[0]->attrs->size(), args[1]->attrs->size()));
foreach (Bindings::iterator, i, *args[0]->attrs) {
Bindings::iterator j = args[1]->attrs->find(i->name);
@ -827,14 +827,15 @@ static void prim_functionArgs(EvalState & state, Value * * args, Value & v)
if (args[0]->type != tLambda)
throw TypeError("`functionArgs' requires a function");
state.mkAttrs(v);
if (!args[0]->lambda.fun->matchAttrs) return;
if (!args[0]->lambda.fun->matchAttrs) {
state.mkAttrs(v, 0);
return;
}
state.mkAttrs(v, args[0]->lambda.fun->formals->formals.size());
foreach (Formals::Formals_::iterator, i, args[0]->lambda.fun->formals->formals)
// !!! should optimise booleans (allocate only once)
mkBool(*state.allocAttr(v, i->name), i->def);
v.attrs->sort();
}
@ -1015,7 +1016,7 @@ static void prim_parseDrvName(EvalState & state, Value * * args, Value & v)
{
string name = state.forceStringNoCtx(*args[0]);
DrvName parsed(name);
state.mkAttrs(v);
state.mkAttrs(v, 2);
mkString(*state.allocAttr(v, state.sName), parsed.name);
mkString(*state.allocAttr(v, state.symbols.create("version")), parsed.version);
v.attrs->sort();
@ -1043,7 +1044,7 @@ void EvalState::createBaseEnv()
Value v;
/* `builtins' must be first! */
mkAttrs(v);
mkAttrs(v, 128);
addConstant("builtins", v);
mkBool(v, true);