Merge pull request #9555 from 9999years/positions-in-errors

Pass positions when evaluating

(cherry picked from commit c8458bd731eb1c74159bebe459ea00165e056b65)
Change-Id: I1b4a5d58973be6264ffdb23b4492da200fdb71be
This commit is contained in:
eldritch horrors 2024-03-04 06:36:36 +01:00
parent d42cd24afe
commit 2ba9788003
12 changed files with 135 additions and 14 deletions

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@ -0,0 +1,43 @@
synopsis: Source locations are printed more consistently in errors
issues: #561
prs: #9555
description: {
Source location information is now included in error messages more
consistently. Given this code:
```nix
let
attr = {foo = "bar";};
key = {};
in
attr.${key}
```
Previously, Nix would show this unhelpful message when attempting to evaluate
it:
```
error:
… while evaluating an attribute name
error: value is a set while a string was expected
```
Now, the error message displays where the problematic value was found:
```
error:
… while evaluating an attribute name
at bad.nix:4:11:
3| key = {};
4| in attr.${key}
| ^
5|
error: value is a set while a string was expected
```
}

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@ -103,8 +103,10 @@ void EvalState::forceValue(Value & v, Callable getPos)
throw;
}
}
else if (v.isApp())
callFunction(*v.app.left, *v.app.right, v, noPos);
else if (v.isApp()) {
PosIdx pos = getPos();
callFunction(*v.app.left, *v.app.right, v, pos);
}
else if (v.isBlackhole())
error("infinite recursion encountered").atPos(getPos()).template debugThrow<EvalError>();
}
@ -121,9 +123,9 @@ template <typename Callable>
[[gnu::always_inline]]
inline void EvalState::forceAttrs(Value & v, Callable getPos, std::string_view errorCtx)
{
forceValue(v, noPos);
if (v.type() != nAttrs) {
PosIdx pos = getPos();
forceValue(v, pos);
if (v.type() != nAttrs) {
error("value is %1% while a set was expected", showType(v)).withTrace(pos, errorCtx).debugThrow<TypeError>();
}
}
@ -132,7 +134,7 @@ inline void EvalState::forceAttrs(Value & v, Callable getPos, std::string_view e
[[gnu::always_inline]]
inline void EvalState::forceList(Value & v, const PosIdx pos, std::string_view errorCtx)
{
forceValue(v, noPos);
forceValue(v, pos);
if (!v.isList()) {
error("value is %1% while a list was expected", showType(v)).withTrace(pos, errorCtx).debugThrow<TypeError>();
}

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@ -341,7 +341,7 @@ static Symbol getName(const AttrName & name, EvalState & state, Env & env)
} else {
Value nameValue;
name.expr->eval(state, env, nameValue);
state.forceStringNoCtx(nameValue, noPos, "while evaluating an attribute name");
state.forceStringNoCtx(nameValue, name.expr->getPos(), "while evaluating an attribute name");
return state.symbols.create(nameValue.string.s);
}
}
@ -1503,7 +1503,7 @@ void ExprOpHasAttr::eval(EvalState & state, Env & env, Value & v)
e->eval(state, env, vTmp);
for (auto & i : attrPath) {
state.forceValue(*vAttrs, noPos);
state.forceValue(*vAttrs, getPos());
Bindings::iterator j;
auto name = getName(i, state, env);
if (vAttrs->type() != nAttrs ||
@ -1672,7 +1672,7 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
if (countCalls) primOpCalls[name]++;
try {
vCur.primOp->fun(*this, noPos, args, vCur);
vCur.primOp->fun(*this, vCur.determinePos(noPos), args, vCur);
} catch (Error & e) {
addErrorTrace(e, pos, "while calling the '%1%' builtin", name);
throw;
@ -1720,7 +1720,7 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
// 1. Unify this and above code. Heavily redundant.
// 2. Create a fake env (arg1, arg2, etc.) and a fake expr (arg1: arg2: etc: builtins.name arg1 arg2 etc)
// so the debugger allows to inspect the wrong parameters passed to the builtin.
primOp->primOp->fun(*this, noPos, vArgs, vCur);
primOp->primOp->fun(*this, vCur.determinePos(noPos), vArgs, vCur);
} catch (Error & e) {
addErrorTrace(e, pos, "while calling the '%1%' builtin", name);
throw;
@ -1828,7 +1828,7 @@ https://nixos.org/manual/nix/stable/language/constructs.html#functions.)", symbo
}
}
callFunction(fun, allocValue()->mkAttrs(attrs), res, noPos);
callFunction(fun, allocValue()->mkAttrs(attrs), res, pos);
}
@ -1864,7 +1864,7 @@ void ExprAssert::eval(EvalState & state, Env & env, Value & v)
void ExprOpNot::eval(EvalState & state, Env & env, Value & v)
{
v.mkBool(!state.evalBool(env, e, noPos, "in the argument of the not operator")); // XXX: FIXME: !
v.mkBool(!state.evalBool(env, e, getPos(), "in the argument of the not operator")); // XXX: FIXME: !
}
@ -2305,7 +2305,7 @@ BackedStringView EvalState::coerceToString(
std::string result;
for (auto [n, v2] : enumerate(v.listItems())) {
try {
result += *coerceToString(noPos, *v2, context,
result += *coerceToString(pos, *v2, context,
"while evaluating one element of the list",
coerceMore, copyToStore, canonicalizePath);
} catch (Error & e) {
@ -2428,8 +2428,8 @@ SingleDerivedPath EvalState::coerceToSingleDerivedPath(const PosIdx pos, Value &
bool EvalState::eqValues(Value & v1, Value & v2, const PosIdx pos, std::string_view errorCtx)
{
forceValue(v1, noPos);
forceValue(v2, noPos);
forceValue(v1, pos);
forceValue(v2, pos);
/* !!! Hack to support some old broken code that relies on pointer
equality tests between sets. (Specifically, builderDefs calls

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@ -400,6 +400,7 @@ struct ExprOpNot : Expr
{
Expr * e;
ExprOpNot(Expr * e) : e(e) { };
PosIdx getPos() const override { return e->getPos(); }
COMMON_METHODS
};

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@ -0,0 +1,20 @@
error:
… while evaluating the attribute 'puppy."${key}"'
at /pwd/lang/eval-fail-attr-name-type.nix:3:5:
2| attrs = {
3| puppy.doggy = {};
| ^
4| };
… while evaluating an attribute name
at /pwd/lang/eval-fail-attr-name-type.nix:7:17:
6| in
7| attrs.puppy.${key}
| ^
8|
error: value is an integer while a string was expected

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@ -0,0 +1,7 @@
let
attrs = {
puppy.doggy = {};
};
key = 1;
in
attrs.puppy.${key}

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@ -0,0 +1,12 @@
error:
… while calling the 'length' builtin
at /pwd/lang/eval-fail-call-primop.nix:1:1:
1| builtins.length 1
| ^
2|
… while evaluating the first argument passed to builtins.length
error: value is an integer while a list was expected

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@ -0,0 +1 @@
builtins.length 1

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@ -0,0 +1,18 @@
error:
… in the argument of the not operator
at /pwd/lang/eval-fail-not-throws.nix:1:4:
1| ! (throw "uh oh!")
| ^
2|
… while calling the 'throw' builtin
at /pwd/lang/eval-fail-not-throws.nix:1:4:
1| ! (throw "uh oh!")
| ^
2|
error: uh oh!

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@ -0,0 +1 @@
! (throw "uh oh!")

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@ -0,0 +1,11 @@
error:
… while evaluating an attribute name
at /pwd/lang/eval-fail-using-set-as-attr-name.nix:5:10:
4| in
5| attr.${key}
| ^
6|
error: value is a set while a string was expected

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@ -0,0 +1,5 @@
let
attr = {foo = "bar";};
key = {};
in
attr.${key}