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Ensure that attrsets are sorted

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Previously you had to remember to call value->attrs->sort() after
populating value->attrs. Now there is a BindingsBuilder helper that
wraps Bindings and ensures that sort() is called before you can use
it.
This commit is contained in:
Eelco Dolstra 2022-01-04 17:39:16 +01:00
parent 1ffacad8a5
commit 6d9a6d2cc3
17 changed files with 260 additions and 198 deletions
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50
src/libexpr/eval.cc
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@ -772,18 +772,30 @@ void mkString(Value & v, const char * s)
}
void Value::mkString(std::string_view s)
{
mkString(dupStringWithLen(s.data(), s.size()));
}
Value & mkString(Value & v, std::string_view s, const PathSet & context)
{
v.mkString(dupStringWithLen(s.data(), s.size()));
v.mkString(s, context);
return v;
}
void Value::mkString(std::string_view s, const PathSet & context)
{
mkString(s);
if (!context.empty()) {
size_t n = 0;
v.string.context = (const char * *)
string.context = (const char * *)
allocBytes((context.size() + 1) * sizeof(char *));
for (auto & i : context)
v.string.context[n++] = dupString(i.c_str());
v.string.context[n] = 0;
string.context[n++] = dupString(i.c_str());
string.context[n] = 0;
}
return v;
}
@ -882,11 +894,11 @@ void EvalState::mkThunk_(Value & v, Expr * expr)
void EvalState::mkPos(Value & v, ptr<Pos> pos)
{
if (pos->file.set()) {
mkAttrs(v, 3);
mkString(*allocAttr(v, sFile), pos->file);
mkInt(*allocAttr(v, sLine), pos->line);
mkInt(*allocAttr(v, sColumn), pos->column);
v.attrs->sort();
auto attrs = buildBindings(3);
attrs.alloc(sFile).mkString(pos->file);
attrs.alloc(sLine).mkInt(pos->line);
attrs.alloc(sColumn).mkInt(pos->column);
v.mkAttrs(attrs);
} else
mkNull(v);
}
@ -1341,7 +1353,7 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
/* Nope, so show the first unexpected argument to the
user. */
for (auto & i : *args[0]->attrs)
if (lambda.formals->argNames.find(i.name) == lambda.formals->argNames.end())
if (!lambda.formals->argNames.count(i.name))
throwTypeError(pos, "%1% called with unexpected argument '%2%'", lambda, i.name);
abort(); // can't happen
}
@ -1484,22 +1496,20 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
return;
}
Value * actualArgs = allocValue();
mkAttrs(*actualArgs, std::max(static_cast<uint32_t>(fun.lambda.fun->formals->formals.size()), args.size()));
auto attrs = buildBindings(std::max(static_cast<uint32_t>(fun.lambda.fun->formals->formals.size()), args.size()));
if (fun.lambda.fun->formals->ellipsis) {
// If the formals have an ellipsis (eg the function accepts extra args) pass
// all available automatic arguments (which includes arguments specified on
// the command line via --arg/--argstr)
for (auto& v : args) {
actualArgs->attrs->push_back(v);
}
for (auto & v : args)
attrs.insert(v);
} else {
// Otherwise, only pass the arguments that the function accepts
for (auto & i : fun.lambda.fun->formals->formals) {
Bindings::iterator j = args.find(i.name);
if (j != args.end()) {
actualArgs->attrs->push_back(*j);
attrs.insert(*j);
} else if (!i.def) {
throwMissingArgumentError(i.pos, R"(cannot evaluate a function that has an argument without a value ('%1%')
@ -1512,9 +1522,7 @@ https://nixos.org/manual/nix/stable/#ss-functions.)", i.name);
}
}
actualArgs->attrs->sort();
callFunction(fun, *actualArgs, res, noPos);
callFunction(fun, allocValue()->mkAttrs(attrs), res, noPos);
}
@ -1719,7 +1727,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
auto path = canonPath(s.str());
mkPath(v, path.c_str());
} else
mkString(v, s.str(), context);
v.mkString(s.str(), context);
}