nixos/nix
1
1
Fork 0
mirror of https://github.com/NixOS/nix.git synced 2025-11-08 19:46:02 +01:00
Code Activity

parser.y: use std::move() to avoid unnecessary copies

Browse source 
With #14314, in some places in the parser we started using C++ objects
directly rather than pointers. In those places lines like `$$ = $1` now
imply a copy when we don't need one. This commit changes those to `$$ =
std::move($1)` to avoid those copies.
This commit is contained in:
Taeer Bar-Yam 2025-10-27 18:31:55 +01:00
parent 126f30deb2
commit ef8dd58d9b
1 changed files with 11 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

22
src/libexpr/parser.y
View file

@ -345,8 +345,8 @@ string_parts
string_parts_interpolated
: string_parts_interpolated STR
{ $$ = $1; $$.emplace_back(state->at(@2), new ExprString(state->alloc, $2)); }
| string_parts_interpolated DOLLAR_CURLY expr '}' { $$ = $1; $$.emplace_back(state->at(@2), $3); }
{ $$ = std::move($1); $$.emplace_back(state->at(@2), new ExprString(state->alloc, $2)); }
| string_parts_interpolated DOLLAR_CURLY expr '}' { $$ = std::move($1); $$.emplace_back(state->at(@2), $3); }
| DOLLAR_CURLY expr '}' { $$.emplace_back(state->at(@1), $2); }
| STR DOLLAR_CURLY expr '}' {
$$.emplace_back(state->at(@1), new ExprString(state->alloc, $1));
@ -391,8 +391,8 @@ path_start
;
ind_string_parts
: ind_string_parts IND_STR { $$ = $1; $$.emplace_back(state->at(@2), $2); }
| ind_string_parts DOLLAR_CURLY expr '}' { $$ = $1; $$.emplace_back(state->at(@2), $3); }
: ind_string_parts IND_STR { $$ = std::move($1); $$.emplace_back(state->at(@2), $2); }
| ind_string_parts DOLLAR_CURLY expr '}' { $$ = std::move($1); $$.emplace_back(state->at(@2), $3); }
| { }
;
@ -440,9 +440,9 @@ binds1
;
attrs
: attrs attr { $$ = $1; $$.emplace_back(AttrName(state->symbols.create($2)), state->at(@2)); }
: attrs attr { $$ = std::move($1); $$.emplace_back(AttrName(state->symbols.create($2)), state->at(@2)); }
| attrs string_attr
{ $$ = $1;
{ $$ = std::move($1);
std::visit(overloaded {
[&](std::string_view str) { $$.emplace_back(AttrName(state->symbols.create(str)), state->at(@2)); },
[&](Expr * expr) {
@ -457,20 +457,20 @@ attrs
;
attrpath
: attrpath '.' attr { $$ = $1; $$.push_back(AttrName(state->symbols.create($3))); }
: attrpath '.' attr { $$ = std::move($1); $$.push_back(AttrName(state->symbols.create($3))); }
| attrpath '.' string_attr
{ $$ = $1;
{ $$ = std::move($1);
std::visit(overloaded {
[&](std::string_view str) { $$.push_back(AttrName(state->symbols.create(str))); },
[&](Expr * expr) { $$.push_back(AttrName(expr)); }
}, $3);
}, std::move($3));
}
| attr { $$.push_back(AttrName(state->symbols.create($1))); }
| string_attr
{ std::visit(overloaded {
[&](std::string_view str) { $$.push_back(AttrName(state->symbols.create(str))); },
[&](Expr * expr) { $$.push_back(AttrName(expr)); }
}, $1);
}, std::move($1));
}
;
@ -480,7 +480,7 @@ attr
;
string_attr
: '"' string_parts '"' { $$ = $2; }
: '"' string_parts '"' { $$ = std::move($2); }
| DOLLAR_CURLY expr '}' { $$ = $2; }
;