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Include position info in function application

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This allows error messages like:

  error: the anonymous function at `/etc/nixos/configuration.nix:1:1'
    called without required argument `foo', at
    `/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix:77:59'
This commit is contained in:
Eelco Dolstra 2014-04-04 17:53:52 +02:00
parent 3f8e1f5682
commit b72c8d2e5b
7 changed files with 45 additions and 22 deletions
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2
src/libexpr/eval-inline.hh
View file

@ -35,7 +35,7 @@ void EvalState::forceValue(Value & v)
}
}
else if (v.type == tApp)
callFunction(*v.app.left, *v.app.right, v);
callFunction(*v.app.left, *v.app.right, v, noPos);
else if (v.type == tBlackhole)
throwEvalError("infinite recursion encountered");
}

31
src/libexpr/eval.cc
View file

@ -130,12 +130,14 @@ string showType(const Value & v)
}
#if HAVE_BOEHMGC
/* Called when the Boehm GC runs out of memory. */
static void * oomHandler(size_t requested)
{
/* Convert this to a proper C++ exception. */
throw std::bad_alloc();
}
#endif
static Symbol getName(const AttrName & name, EvalState & state, Env & env) {
@ -292,14 +294,19 @@ LocalNoInlineNoReturn(void throwTypeError(const char * s, const string & s1))
throw TypeError(format(s) % s1);
}
LocalNoInlineNoReturn(void throwTypeError(const char * s, const Value & v, const Pos & pos))
{
throw TypeError(format(s) % showType(v) % pos);
}
LocalNoInlineNoReturn(void throwTypeError(const char * s, const string & s1, const string & s2))
{
throw TypeError(format(s) % s1 % s2);
}
LocalNoInlineNoReturn(void throwTypeError(const char * s, const ExprLambda & fun, const Symbol & s2))
LocalNoInlineNoReturn(void throwTypeError(const char * s, const ExprLambda & fun, const Symbol & s2, const Pos & pos))
{
throw TypeError(format(s) % fun.showNamePos() % s2);
throw TypeError(format(s) % fun.showNamePos() % s2 % pos);
}
LocalNoInlineNoReturn(void throwAssertionError(const char * s, const Pos & pos))
@ -317,9 +324,9 @@ LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2))
e.addPrefix(format(s) % s2);
}
LocalNoInline(void addErrorPrefix(Error & e, const char * s, const ExprLambda & fun))
LocalNoInline(void addErrorPrefix(Error & e, const char * s, const ExprLambda & fun, const Pos & pos))
{
e.addPrefix(format(s) % fun.showNamePos());
e.addPrefix(format(s) % fun.showNamePos() % pos);
}
LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2, const Pos & pos))
@ -783,7 +790,7 @@ void ExprApp::eval(EvalState & state, Env & env, Value & v)
/* FIXME: vFun prevents GCC from doing tail call optimisation. */
Value vFun;
e1->eval(state, env, vFun);
state.callFunction(vFun, *(e2->maybeThunk(state, env)), v);
state.callFunction(vFun, *(e2->maybeThunk(state, env)), v, pos);
}
@ -824,7 +831,7 @@ void EvalState::callPrimOp(Value & fun, Value & arg, Value & v)
}
void EvalState::callFunction(Value & fun, Value & arg, Value & v)
void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos)
{
if (fun.type == tPrimOp || fun.type == tPrimOpApp) {
callPrimOp(fun, arg, v);
@ -832,7 +839,7 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
}
if (fun.type != tLambda)
throwTypeError("attempt to call something which is not a function but %1%", fun);
throwTypeError("attempt to call something which is not a function but %1%, at %2%", fun, pos);
ExprLambda & lambda(*fun.lambda.fun);
@ -860,8 +867,8 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
foreach (Formals::Formals_::iterator, i, lambda.formals->formals) {
Bindings::iterator j = arg.attrs->find(i->name);
if (j == arg.attrs->end()) {
if (!i->def) throwTypeError("%1% called without required argument `%2%'",
lambda, i->name);
if (!i->def) throwTypeError("%1% called without required argument `%2%', at %3%",
lambda, i->name, pos);
env2.values[displ++] = i->def->maybeThunk(*this, env2);
} else {
attrsUsed++;
@ -876,7 +883,7 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
user. */
foreach (Bindings::iterator, i, *arg.attrs)
if (lambda.formals->argNames.find(i->name) == lambda.formals->argNames.end())
throwTypeError("%1% called with unexpected argument `%2%'", lambda, i->name);
throwTypeError("%1% called with unexpected argument `%2%', at %3%", lambda, i->name, pos);
abort(); // can't happen
}
}
@ -890,7 +897,7 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
try {
lambda.body->eval(*this, env2, v);
} catch (Error & e) {
addErrorPrefix(e, "while evaluating %1%:\n", lambda);
addErrorPrefix(e, "while evaluating %1%, called from %2%:\n", lambda, pos);
throw;
}
else
@ -928,7 +935,7 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
actualArgs->attrs->sort();
callFunction(fun, *actualArgs, res);
callFunction(fun, *actualArgs, res, noPos);
}

2
src/libexpr/eval.hh
View file

@ -226,7 +226,7 @@ public:
elements and attributes are compared recursively. */
bool eqValues(Value & v1, Value & v2);
void callFunction(Value & fun, Value & arg, Value & v);
void callFunction(Value & fun, Value & arg, Value & v, const Pos & pos);
void callPrimOp(Value & fun, Value & arg, Value & v);
/* Automatically call a function for which each argument has a

2
src/libexpr/nixexpr.cc
View file

@ -373,7 +373,7 @@ void ExprLambda::setName(Symbol & name)
string ExprLambda::showNamePos() const
{
return (format("%1% at %2%") % (name.set() ? "`" + (string) name + "'" : "an anonymous function") % pos).str();
return (format("%1% at %2%") % (name.set() ? "`" + (string) name + "'" : "anonymous function") % pos).str();
}

18
src/libexpr/nixexpr.hh
View file

@ -273,6 +273,23 @@ struct ExprBuiltin : Expr
COMMON_METHODS
};
struct ExprApp : Expr
{
Pos pos;
Expr * e1, * e2;
ExprApp(Expr * e1, Expr * e2) : e1(e1), e2(e2) { };
ExprApp(const Pos & pos, Expr * e1, Expr * e2) : pos(pos), e1(e1), e2(e2) { };
void show(std::ostream & str)
{
str << *e1 << " " << *e2;
}
void bindVars(const StaticEnv & env)
{
e1->bindVars(env); e2->bindVars(env);
}
void eval(EvalState & state, Env & env, Value & v);
};
#define MakeBinOp(name, s) \
struct Expr##name : Expr \
{ \
@ -289,7 +306,6 @@ struct ExprBuiltin : Expr
void eval(EvalState & state, Env & env, Value & v); \
};
MakeBinOp(App, "")
MakeBinOp(OpEq, "==")
MakeBinOp(OpNEq, "!=")
MakeBinOp(OpAnd, "&&")

6
src/libexpr/parser.y
View file

@ -224,7 +224,7 @@ void backToString(yyscan_t scanner);
void backToIndString(yyscan_t scanner);
static Pos makeCurPos(const YYLTYPE & loc, ParseData * data)
static inline Pos makeCurPos(const YYLTYPE & loc, ParseData * data)
{
return Pos(data->path, loc.first_line, loc.first_column);
}
@ -355,7 +355,7 @@ expr_op
expr_app
: expr_app expr_select
{ $$ = new ExprApp($1, $2); }
{ $$ = new ExprApp(CUR_POS, $1, $2); }
| expr_select { $$ = $1; }
;
@ -367,7 +367,7 @@ expr_select
| /* Backwards compatibility: because Nixpkgs has a rarely used
function named ‘or’, allow stuff like ‘map or [...]’. */
expr_simple OR_KW
{ $$ = new ExprApp($1, new ExprVar(CUR_POS, data->symbols.create("or"))); }
{ $$ = new ExprApp(CUR_POS, $1, new ExprVar(CUR_POS, data->symbols.create("or"))); }
| expr_simple { $$ = $1; }
;

6
src/libexpr/primops.cc
View file

@ -711,7 +711,7 @@ struct FilterFromExpr : PathFilter
mkString(arg1, path);
Value fun2;
state.callFunction(filter, arg1, fun2);
state.callFunction(filter, arg1, fun2, noPos);
Value arg2;
mkString(arg2,
@ -721,7 +721,7 @@ struct FilterFromExpr : PathFilter
"unknown" /* not supported, will fail! */);
Value res;
state.callFunction(fun2, arg2, res);
state.callFunction(fun2, arg2, res, noPos);
return state.forceBool(res);
}
@ -1008,7 +1008,7 @@ static void prim_filter(EvalState & state, Value * * args, Value & v)
bool same = true;
for (unsigned int n = 0; n < args[1]->list.length; ++n) {
Value res;
state.callFunction(*args[0], *args[1]->list.elems[n], res);
state.callFunction(*args[0], *args[1]->list.elems[n], res, noPos);
if (state.forceBool(res))
vs[k++] = args[1]->list.elems[n];
else