mirror of
https://github.com/NixOS/nix.git
synced 2024-11-22 14:52:55 +00:00
don't repeatedly look up ast internal symbols
these symbols are used a *lot*, so it makes sense to cache them. this mostly increases clarity of the code (however clear one may wish to call the parser desugaring here), but it also provides a small performance benefit.
This commit is contained in:
parent
b596cc9e79
commit
09a1128d9e
@ -419,6 +419,16 @@ EvalState::EvalState(
|
||||
, sPath(symbols.create("path"))
|
||||
, sPrefix(symbols.create("prefix"))
|
||||
, sOutputSpecified(symbols.create("outputSpecified"))
|
||||
, exprSymbols{
|
||||
.sub = symbols.create("__sub"),
|
||||
.lessThan = symbols.create("__lessThan"),
|
||||
.mul = symbols.create("__mul"),
|
||||
.div = symbols.create("__div"),
|
||||
.or_ = symbols.create("or"),
|
||||
.findFile = symbols.create("__findFile"),
|
||||
.nixPath = symbols.create("__nixPath"),
|
||||
.body = symbols.create("body")
|
||||
}
|
||||
, repair(NoRepair)
|
||||
, emptyBindings(0)
|
||||
, rootFS(
|
||||
@ -2808,7 +2818,7 @@ Expr * EvalState::parse(
|
||||
const SourcePath & basePath,
|
||||
std::shared_ptr<StaticEnv> & staticEnv)
|
||||
{
|
||||
auto result = parseExprFromBuf(text, length, origin, basePath, symbols, positions, rootFS);
|
||||
auto result = parseExprFromBuf(text, length, origin, basePath, symbols, positions, rootFS, exprSymbols);
|
||||
|
||||
result->bindVars(*this, staticEnv);
|
||||
|
||||
|
@ -207,6 +207,8 @@ public:
|
||||
sPrefix,
|
||||
sOutputSpecified;
|
||||
|
||||
const Expr::AstSymbols exprSymbols;
|
||||
|
||||
/**
|
||||
* If set, force copying files to the Nix store even if they
|
||||
* already exist there.
|
||||
|
@ -140,6 +140,11 @@ std::string showAttrPath(const SymbolTable & symbols, const AttrPath & attrPath)
|
||||
|
||||
struct Expr
|
||||
{
|
||||
struct AstSymbols {
|
||||
Symbol sub, lessThan, mul, div, or_, findFile, nixPath, body;
|
||||
};
|
||||
|
||||
|
||||
static unsigned long nrExprs;
|
||||
Expr() {
|
||||
nrExprs++;
|
||||
|
@ -43,6 +43,7 @@ struct ParserState {
|
||||
SourcePath basePath;
|
||||
PosTable::Origin origin;
|
||||
const ref<InputAccessor> rootFS;
|
||||
const Expr::AstSymbols & s;
|
||||
|
||||
void dupAttr(const AttrPath & attrPath, const PosIdx pos, const PosIdx prevPos);
|
||||
void dupAttr(Symbol attr, const PosIdx pos, const PosIdx prevPos);
|
||||
|
@ -41,7 +41,8 @@ Expr * parseExprFromBuf(
|
||||
const SourcePath & basePath,
|
||||
SymbolTable & symbols,
|
||||
PosTable & positions,
|
||||
const ref<InputAccessor> rootFS);
|
||||
const ref<InputAccessor> rootFS,
|
||||
const Expr::AstSymbols & astSymbols);
|
||||
|
||||
}
|
||||
|
||||
@ -168,13 +169,13 @@ expr_if
|
||||
|
||||
expr_op
|
||||
: '!' expr_op %prec NOT { $$ = new ExprOpNot($2); }
|
||||
| '-' expr_op %prec NEGATE { $$ = new ExprCall(CUR_POS, new ExprVar(state->symbols.create("__sub")), {new ExprInt(0), $2}); }
|
||||
| '-' expr_op %prec NEGATE { $$ = new ExprCall(CUR_POS, new ExprVar(state->s.sub), {new ExprInt(0), $2}); }
|
||||
| expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); }
|
||||
| expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); }
|
||||
| expr_op '<' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__lessThan")), {$1, $3}); }
|
||||
| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__lessThan")), {$3, $1})); }
|
||||
| expr_op '>' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__lessThan")), {$3, $1}); }
|
||||
| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__lessThan")), {$1, $3})); }
|
||||
| expr_op '<' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$1, $3}); }
|
||||
| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$3, $1})); }
|
||||
| expr_op '>' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$3, $1}); }
|
||||
| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$1, $3})); }
|
||||
| expr_op AND expr_op { $$ = new ExprOpAnd(state->at(@2), $1, $3); }
|
||||
| expr_op OR expr_op { $$ = new ExprOpOr(state->at(@2), $1, $3); }
|
||||
| expr_op IMPL expr_op { $$ = new ExprOpImpl(state->at(@2), $1, $3); }
|
||||
@ -182,9 +183,9 @@ expr_op
|
||||
| expr_op '?' attrpath { $$ = new ExprOpHasAttr($1, std::move(*$3)); delete $3; }
|
||||
| expr_op '+' expr_op
|
||||
{ $$ = new ExprConcatStrings(state->at(@2), false, new std::vector<std::pair<PosIdx, Expr *> >({{state->at(@1), $1}, {state->at(@3), $3}})); }
|
||||
| expr_op '-' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__sub")), {$1, $3}); }
|
||||
| expr_op '*' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__mul")), {$1, $3}); }
|
||||
| expr_op '/' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__div")), {$1, $3}); }
|
||||
| expr_op '-' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.sub), {$1, $3}); }
|
||||
| expr_op '*' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.mul), {$1, $3}); }
|
||||
| expr_op '/' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.div), {$1, $3}); }
|
||||
| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists(state->at(@2), $1, $3); }
|
||||
| expr_app
|
||||
;
|
||||
@ -208,7 +209,7 @@ expr_select
|
||||
| /* Backwards compatibility: because Nixpkgs has a rarely used
|
||||
function named ‘or’, allow stuff like ‘map or [...]’. */
|
||||
expr_simple OR_KW
|
||||
{ $$ = new ExprCall(CUR_POS, $1, {new ExprVar(CUR_POS, state->symbols.create("or"))}); }
|
||||
{ $$ = new ExprCall(CUR_POS, $1, {new ExprVar(CUR_POS, state->s.or_)}); }
|
||||
| expr_simple
|
||||
;
|
||||
|
||||
@ -235,8 +236,8 @@ expr_simple
|
||||
| SPATH {
|
||||
std::string path($1.p + 1, $1.l - 2);
|
||||
$$ = new ExprCall(CUR_POS,
|
||||
new ExprVar(state->symbols.create("__findFile")),
|
||||
{new ExprVar(state->symbols.create("__nixPath")),
|
||||
new ExprVar(state->s.findFile),
|
||||
{new ExprVar(state->s.nixPath),
|
||||
new ExprString(std::move(path))});
|
||||
}
|
||||
| URI {
|
||||
@ -252,7 +253,7 @@ expr_simple
|
||||
/* Let expressions `let {..., body = ...}' are just desugared
|
||||
into `(rec {..., body = ...}).body'. */
|
||||
| LET '{' binds '}'
|
||||
{ $3->recursive = true; $$ = new ExprSelect(noPos, $3, state->symbols.create("body")); }
|
||||
{ $3->recursive = true; $$ = new ExprSelect(noPos, $3, state->s.body); }
|
||||
| REC '{' binds '}'
|
||||
{ $3->recursive = true; $$ = $3; }
|
||||
| '{' binds '}'
|
||||
@ -414,7 +415,8 @@ Expr * parseExprFromBuf(
|
||||
const SourcePath & basePath,
|
||||
SymbolTable & symbols,
|
||||
PosTable & positions,
|
||||
const ref<InputAccessor> rootFS)
|
||||
const ref<InputAccessor> rootFS,
|
||||
const Expr::AstSymbols & astSymbols)
|
||||
{
|
||||
yyscan_t scanner;
|
||||
ParserState state {
|
||||
@ -423,6 +425,7 @@ Expr * parseExprFromBuf(
|
||||
.basePath = basePath,
|
||||
.origin = {origin},
|
||||
.rootFS = rootFS,
|
||||
.s = astSymbols,
|
||||
};
|
||||
|
||||
yylex_init(&scanner);
|
||||
|
Loading…
Reference in New Issue
Block a user