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Get rid of some unnecessary ExprConcatStrings nodes in dynamic attrs

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This gives a ~18% speedup in NixOS evaluation (after converting
most calls to hasAttr/getAttr to dynamic attrs).
This commit is contained in:
Eelco Dolstra 2014-10-05 01:04:58 +02:00
parent 1418806969
commit b6809608cc
3 changed files with 18 additions and 25 deletions
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5
src/libexpr/eval.cc
View file

@ -701,13 +701,10 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
/* Dynamic attrs apply *after* rec and __overrides. */
foreach (DynamicAttrDefs::iterator, i, dynamicAttrs) {
Value nameVal;
if (i->nameExpr->es->size() == 1) {
i->nameExpr->es->front()->eval(state, *dynamicEnv, nameVal);
i->nameExpr->eval(state, *dynamicEnv, nameVal);
state.forceValue(nameVal);
if (nameVal.type == tNull)
continue;
}
i->nameExpr->eval(state, *dynamicEnv, nameVal);
state.forceStringNoCtx(nameVal);
Symbol nameSym = state.symbols.create(nameVal.string.s);
Bindings::iterator j = v.attrs->find(nameSym);

14
src/libexpr/nixexpr.hh
View file

@ -53,16 +53,15 @@ struct Env;
struct Value;
class EvalState;
struct StaticEnv;
struct ExprConcatStrings;
/* An attribute path is a sequence of attribute names. */
struct AttrName
{
Symbol symbol;
ExprConcatStrings * expr;
Expr * expr;
AttrName(const Symbol & s) : symbol(s) {};
AttrName(ExprConcatStrings * e) : expr(e) {};
AttrName(Expr * e) : expr(e) {};
};
typedef std::vector<AttrName> AttrPath;
@ -173,16 +172,17 @@ struct ExprAttrs : Expr
Expr * e;
Pos pos;
unsigned int displ; // displacement
AttrDef(Expr * e, const Pos & pos, bool inherited=false) : inherited(inherited), e(e), pos(pos) { };
AttrDef(Expr * e, const Pos & pos, bool inherited=false)
: inherited(inherited), e(e), pos(pos) { };
AttrDef() { };
};
typedef std::map<Symbol, AttrDef> AttrDefs;
AttrDefs attrs;
struct DynamicAttrDef {
ExprConcatStrings * nameExpr;
Expr * valueExpr;
Expr * nameExpr, * valueExpr;
Pos pos;
DynamicAttrDef(ExprConcatStrings * nameExpr, Expr * valueExpr, const Pos & pos) : nameExpr(nameExpr), valueExpr(valueExpr), pos(pos) { };
DynamicAttrDef(Expr * nameExpr, Expr * valueExpr, const Pos & pos)
: nameExpr(nameExpr), valueExpr(valueExpr), pos(pos) { };
};
typedef std::vector<DynamicAttrDef> DynamicAttrDefs;
DynamicAttrDefs dynamicAttrs;

16
src/libexpr/parser.y
View file

@ -341,11 +341,7 @@ expr_op
| expr_op UPDATE expr_op { $$ = new ExprOpUpdate(CUR_POS, $1, $3); }
| expr_op '?' attrpath { $$ = new ExprOpHasAttr($1, *$3); }
| expr_op '+' expr_op
{ vector<Expr *> * l = new vector<Expr *>;
l->push_back($1);
l->push_back($3);
$$ = new ExprConcatStrings(CUR_POS, false, l);
}
{ $$ = new ExprConcatStrings(CUR_POS, false, new vector<Expr *>({$1, $3})); }
| expr_op '-' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__sub")), $1), $3); }
| expr_op '*' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__mul")), $1), $3); }
| expr_op '/' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__div")), $1), $3); }
@ -461,7 +457,7 @@ attrs
: attrs attr { $$ = $1; $1->push_back(AttrName(data->symbols.create($2))); }
| attrs string_attr
{ $$ = $1;
ExprString *str = dynamic_cast<ExprString *>($2);
ExprString * str = dynamic_cast<ExprString *>($2);
if (str) {
$$->push_back(AttrName(str->s));
delete str;
@ -476,12 +472,12 @@ attrpath
: attrpath '.' attr { $$ = $1; $1->push_back(AttrName(data->symbols.create($3))); }
| attrpath '.' string_attr
{ $$ = $1;
ExprString *str = dynamic_cast<ExprString *>($3);
ExprString * str = dynamic_cast<ExprString *>($3);
if (str) {
$$->push_back(AttrName(str->s));
delete str;
} else
$$->push_back(AttrName(static_cast<ExprConcatStrings *>($3)));
$$->push_back(AttrName($3));
}
| attr { $$ = new vector<AttrName>; $$->push_back(AttrName(data->symbols.create($1))); }
| string_attr
@ -491,7 +487,7 @@ attrpath
$$->push_back(AttrName(str->s));
delete str;
} else
$$->push_back(AttrName(static_cast<ExprConcatStrings *>($1)));
$$->push_back(AttrName($1));
}
;
@ -502,7 +498,7 @@ attr
string_attr
: '"' string_parts '"' { $$ = $2; }
| DOLLAR_CURLY expr '}' { $$ = new ExprConcatStrings(CUR_POS, true, new vector<Expr*>(1, $2)); }
| DOLLAR_CURLY expr '}' { $$ = $2; }
;
expr_list