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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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18
src/libexpr/value-to-xml.cc
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@ -19,7 +19,7 @@ static XMLAttrs singletonAttrs(const std::string & name, const std::string & val
static void printValueAsXML(EvalState & state, bool strict, bool location,
Value & v, XMLWriter & doc, PathSet & context, PathSet & drvsSeen,
const Pos & pos);
const PosIdx pos);
static void posToXML(XMLAttrs & xmlAttrs, const Pos & pos)
@ -43,18 +43,18 @@ static void showAttrs(EvalState & state, bool strict, bool location,
XMLAttrs xmlAttrs;
xmlAttrs["name"] = i;
if (location && a.pos != ptr(&noPos)) posToXML(xmlAttrs, *a.pos);
if (location && a.pos) posToXML(xmlAttrs, state.positions[a.pos]);
XMLOpenElement _(doc, "attr", xmlAttrs);
printValueAsXML(state, strict, location,
*a.value, doc, context, drvsSeen, *a.pos);
*a.value, doc, context, drvsSeen, a.pos);
}
}
static void printValueAsXML(EvalState & state, bool strict, bool location,
Value & v, XMLWriter & doc, PathSet & context, PathSet & drvsSeen,
const Pos & pos)
const PosIdx pos)
{
checkInterrupt();
@ -93,14 +93,14 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
Path drvPath;
a = v.attrs->find(state.sDrvPath);
if (a != v.attrs->end()) {
if (strict) state.forceValue(*a->value, *a->pos);
if (strict) state.forceValue(*a->value, a->pos);
if (a->value->type() == nString)
xmlAttrs["drvPath"] = drvPath = a->value->string.s;
}
a = v.attrs->find(state.sOutPath);
if (a != v.attrs->end()) {
if (strict) state.forceValue(*a->value, *a->pos);
if (strict) state.forceValue(*a->value, a->pos);
if (a->value->type() == nString)
xmlAttrs["outPath"] = a->value->string.s;
}
@ -134,7 +134,7 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
break;
}
XMLAttrs xmlAttrs;
if (location) posToXML(xmlAttrs, v.lambda.fun->pos);
if (location) posToXML(xmlAttrs, state.positions[v.lambda.fun->pos]);
XMLOpenElement _(doc, "function", xmlAttrs);
if (v.lambda.fun->hasFormals()) {
@ -166,14 +166,14 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
void ExternalValueBase::printValueAsXML(EvalState & state, bool strict,
bool location, XMLWriter & doc, PathSet & context, PathSet & drvsSeen,
const Pos & pos) const
const PosIdx pos) const
{
doc.writeEmptyElement("unevaluated");
}
void printValueAsXML(EvalState & state, bool strict, bool location,
Value & v, std::ostream & out, PathSet & context, const Pos & pos)
Value & v, std::ostream & out, PathSet & context, const PosIdx pos)
{
XMLWriter doc(true, out);
XMLOpenElement root(doc, "expr");