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replace most Pos objects/ptrs with indexes into a position table

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Pos objects are somewhat wasteful as they duplicate the origin file name and
input type for each object. on files that produce more than one Pos when parsed
this a sizeable waste of memory (one pointer per Pos). the same goes for
ptr<Pos> on 64 bit machines: parsing enough source to require 8 bytes to locate
a position would need at least 8GB of input and 64GB of expression memory. it's
not likely that we'll hit that any time soon, so we can use a uint32_t index to
locate positions instead.
This commit is contained in:
pennae 2022-03-04 19:31:59 +01:00
parent 34b72775cf
commit 6526d1676b
36 changed files with 752 additions and 622 deletions
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12
src/libexpr/value-to-json.cc
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@ -10,7 +10,7 @@
namespace nix {
void printValueAsJSON(EvalState & state, bool strict,
Value & v, const Pos & pos, JSONPlaceholder & out, PathSet & context)
Value & v, const PosIdx pos, JSONPlaceholder & out, PathSet & context)
{
checkInterrupt();
@ -54,10 +54,10 @@ void printValueAsJSON(EvalState & state, bool strict,
for (auto & j : names) {
Attr & a(*v.attrs->find(state.symbols.create(j)));
auto placeholder(obj.placeholder(j));
printValueAsJSON(state, strict, *a.value, *a.pos, placeholder, context);
printValueAsJSON(state, strict, *a.value, a.pos, placeholder, context);
}
} else
printValueAsJSON(state, strict, *i->value, *i->pos, out, context);
printValueAsJSON(state, strict, *i->value, i->pos, out, context);
break;
}
@ -82,15 +82,15 @@ void printValueAsJSON(EvalState & state, bool strict,
case nFunction:
auto e = TypeError({
.msg = hintfmt("cannot convert %1% to JSON", showType(v)),
.errPos = v.determinePos(pos)
.errPos = state.positions[v.determinePos(pos)]
});
e.addTrace(pos, hintfmt("message for the trace"));
e.addTrace(state.positions[pos], hintfmt("message for the trace"));
throw e;
}
}
void printValueAsJSON(EvalState & state, bool strict,
Value & v, const Pos & pos, std::ostream & str, PathSet & context)
Value & v, const PosIdx pos, std::ostream & str, PathSet & context)
{
JSONPlaceholder out(str);
printValueAsJSON(state, strict, v, pos, out, context);