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report inherit attr errors at the duplicate name

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previously we reported the error at the beginning of the binding
block (for plain inherits) or the beginning of the attr list (for
inherit-from), effectively hiding where exactly the error happened.

this also carries over to runtime positions of attributes in sets as
reported by unsafeGetAttrPos. we're not worried about this changing
observable eval behavior because it *is* marked unsafe, and the new
behavior is much more useful.
This commit is contained in:
pennae 2024-01-29 06:19:23 +01:00
parent 4147ecfb1c
commit 1edd6fada5
8 changed files with 42 additions and 22 deletions
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6
doc/manual/rl-next/inherit-error-positions.md Normal file
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@ -0,0 +1,6 @@
---
synopsis: fix duplicate attribute error positions for `inherit`
prs: 9874
---
When an inherit caused a duplicate attribute error the position of the error was not reported correctly, placing the error with the inherit itself or at the start of the bindings block instead of the offending attribute name.

25
src/libexpr/parser.y
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@ -87,6 +87,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParserState * state, const char *
nix::StringToken uri;
nix::StringToken str;
std::vector<nix::AttrName> * attrNames;
std::vector<std::pair<nix::AttrName, nix::PosIdx>> * inheritAttrs;
std::vector<std::pair<nix::PosIdx, nix::Expr *>> * string_parts;
std::vector<std::pair<nix::PosIdx, std::variant<nix::Expr *, nix::StringToken>>> * ind_string_parts;
}
@ -97,7 +98,8 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParserState * state, const char *
%type <attrs> binds
%type <formals> formals
%type <formal> formal
%type <attrNames> attrs attrpath
%type <attrNames> attrpath
%type <inheritAttrs> attrs
%type <string_parts> string_parts_interpolated
%type <ind_string_parts> ind_string_parts
%type <e> path_start string_parts string_attr
@ -309,13 +311,12 @@ binds
: binds attrpath '=' expr ';' { $$ = $1; state->addAttr($$, std::move(*$2), $4, state->at(@2)); delete $2; }
| binds INHERIT attrs ';'
{ $$ = $1;
for (auto & i : *$3) {
for (auto & [i, iPos] : *$3) {
if ($$->attrs.find(i.symbol) != $$->attrs.end())
state->dupAttr(i.symbol, state->at(@3), $$->attrs[i.symbol].pos);
auto pos = state->at(@3);
state->dupAttr(i.symbol, iPos, $$->attrs[i.symbol].pos);
$$->attrs.emplace(
i.symbol,
ExprAttrs::AttrDef(new ExprVar(CUR_POS, i.symbol), pos, ExprAttrs::AttrDef::Kind::Inherited));
ExprAttrs::AttrDef(new ExprVar(iPos, i.symbol), iPos, ExprAttrs::AttrDef::Kind::Inherited));
}
delete $3;
}
@ -325,14 +326,14 @@ binds
$$->inheritFromExprs = std::make_unique<std::vector<Expr *>>();
$$->inheritFromExprs->push_back($4);
auto from = new nix::ExprInheritFrom(state->at(@4), $$->inheritFromExprs->size() - 1);
for (auto & i : *$6) {
for (auto & [i, iPos] : *$6) {
if ($$->attrs.find(i.symbol) != $$->attrs.end())
state->dupAttr(i.symbol, state->at(@6), $$->attrs[i.symbol].pos);
state->dupAttr(i.symbol, iPos, $$->attrs[i.symbol].pos);
$$->attrs.emplace(
i.symbol,
ExprAttrs::AttrDef(
new ExprSelect(CUR_POS, from, i.symbol),
state->at(@6),
new ExprSelect(iPos, from, i.symbol),
iPos,
ExprAttrs::AttrDef::Kind::InheritedFrom));
}
delete $6;
@ -341,12 +342,12 @@ binds
;
attrs
: attrs attr { $$ = $1; $1->push_back(AttrName(state->symbols.create($2))); }
: attrs attr { $$ = $1; $1->emplace_back(AttrName(state->symbols.create($2)), state->at(@2)); }
| attrs string_attr
{ $$ = $1;
ExprString * str = dynamic_cast<ExprString *>($2);
if (str) {
$$->push_back(AttrName(state->symbols.create(str->s)));
$$->emplace_back(AttrName(state->symbols.create(str->s)), state->at(@2));
delete str;
} else
throw ParseError({
@ -354,7 +355,7 @@ attrs
.pos = state->positions[state->at(@2)]
});
}
| { $$ = new AttrPath; }
| { $$ = new std::vector<std::pair<AttrName, PosIdx>>; }
;
attrpath

1
tests/functional/lang/eval-okay-inherit-attr-pos.exp Normal file
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@ -0,0 +1 @@
[ { column = 17; file = "/pwd/lang/eval-okay-inherit-attr-pos.nix"; line = 4; } { column = 19; file = "/pwd/lang/eval-okay-inherit-attr-pos.nix"; line = 4; } { column = 21; file = "/pwd/lang/eval-okay-inherit-attr-pos.nix"; line = 5; } { column = 23; file = "/pwd/lang/eval-okay-inherit-attr-pos.nix"; line = 5; } ]

12
tests/functional/lang/eval-okay-inherit-attr-pos.nix Normal file
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@ -0,0 +1,12 @@
let
d = 0;
x = 1;
y = { inherit d x; };
z = { inherit (y) d x; };
in
[
(builtins.unsafeGetAttrPos "d" y)
(builtins.unsafeGetAttrPos "x" y)
(builtins.unsafeGetAttrPos "d" z)
(builtins.unsafeGetAttrPos "x" z)
]

4
tests/functional/lang/parse-fail-dup-attrs-2.err.exp
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@ -1,6 +1,6 @@
error: attribute 'x' already defined at «stdin»:9:5
at «stdin»:10:17:
at «stdin»:10:18:
9| x = 789;
10| inherit (as) x;
| ^
| ^
11| };

4
tests/functional/lang/parse-fail-dup-attrs-3.err.exp
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@ -1,6 +1,6 @@
error: attribute 'x' already defined at «stdin»:9:5
at «stdin»:10:17:
at «stdin»:10:18:
9| x = 789;
10| inherit (as) x;
| ^
| ^
11| };

6
tests/functional/lang/parse-fail-dup-attrs-7.err.exp
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@ -1,6 +1,6 @@
error: attribute 'x' already defined at «stdin»:6:12
at «stdin»:7:12:
error: attribute 'x' already defined at «stdin»:6:13
at «stdin»:7:13:
6| inherit x;
7| inherit x;
| ^
| ^
8| };

6
tests/functional/lang/parse-fail-regression-20060610.err.exp
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@ -1,6 +1,6 @@
error: undefined variable 'gcc'
at «stdin»:8:12:
7|
at «stdin»:9:13:
8| body = ({
| ^
9| inherit gcc;
| ^
10| }).gcc;