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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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5
src/libexpr/value.hh
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@ -56,6 +56,7 @@ struct Expr;
struct ExprLambda;
struct PrimOp;
class Symbol;
class PosIdx;
struct Pos;
class StorePath;
class Store;
@ -103,7 +104,7 @@ class ExternalValueBase
/* Print the value as XML. Defaults to unevaluated */
virtual void printValueAsXML(EvalState & state, bool strict, bool location,
XMLWriter & doc, PathSet & context, PathSet & drvsSeen,
const Pos & pos) const;
const PosIdx pos) const;
virtual ~ExternalValueBase()
{
@ -368,7 +369,7 @@ public:
return internalType == tList1 ? 1 : internalType == tList2 ? 2 : bigList.size;
}
Pos determinePos(const Pos & pos) const;
PosIdx determinePos(const PosIdx pos) const;
/* Check whether forcing this value requires a trivial amount of
computation. In particular, function applications are