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* Memoize strict evaluation.

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This commit is contained in:
Eelco Dolstra 2007-01-13 15:41:54 +00:00
parent 5011588459
commit 05879db628
2 changed files with 29 additions and 13 deletions
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39
src/libexpr/eval.cc
View file

@ -672,7 +672,10 @@ Expr evalFile(EvalState & state, const Path & path)
}
Expr strictEvalExpr(EvalState & state, Expr e, bool canonicalise)
static Expr strictEvalExpr(EvalState & state, Expr e, ATermMap & nfs);
static Expr strictEvalExpr_(EvalState & state, Expr e, ATermMap & nfs)
{
e = evalExpr(state, e);
@ -682,13 +685,8 @@ Expr strictEvalExpr(EvalState & state, Expr e, bool canonicalise)
for (ATermIterator i(as); i; ++i) {
ATerm name; Expr e; ATerm pos;
if (!matchBind(*i, name, e, pos)) abort(); /* can't happen */
as2 = ATinsert(as2, makeBind(name, strictEvalExpr(state, e, canonicalise),
canonicalise ? makeNoPos() : pos));
as2 = ATinsert(as2, makeBind(name, strictEvalExpr(state, e, nfs), pos));
}
if (canonicalise) {
}
/* !!! sort attributes if canonicalise == true */
return makeAttrs(ATreverse(as2));
}
@ -696,7 +694,7 @@ Expr strictEvalExpr(EvalState & state, Expr e, bool canonicalise)
if (matchList(e, es)) {
ATermList es2 = ATempty;
for (ATermIterator i(es); i; ++i)
es2 = ATinsert(es2, strictEvalExpr(state, *i, canonicalise));
es2 = ATinsert(es2, strictEvalExpr(state, *i, nfs));
return makeList(ATreverse(es2));
}
@ -713,21 +711,40 @@ Expr strictEvalExpr(EvalState & state, Expr e, bool canonicalise)
if (matchValidValues(valids, valids2)) {
ATermList valids3 = ATempty;
for (ATermIterator j(valids2); j; ++j)
valids3 = ATinsert(valids3, strictEvalExpr(state, *j, canonicalise));
valids3 = ATinsert(valids3, strictEvalExpr(state, *j, nfs));
valids = makeValidValues(ATreverse(valids3));
}
formals2 = ATinsert(formals2, makeFormal(name, valids, dummy));
}
return makeFunction(ATreverse(formals2), body,
canonicalise ? makeNoPos() : pos);
return makeFunction(ATreverse(formals2), body, pos);
}
return e;
}
static Expr strictEvalExpr(EvalState & state, Expr e, ATermMap & nfs)
{
Expr nf = nfs.get(e);
if (nf) return nf;
nf = strictEvalExpr_(state, e, nfs);
nfs.set(e, nf);
return nf;
}
Expr strictEvalExpr(EvalState & state, Expr e)
{
ATermMap strictNormalForms;
return strictEvalExpr(state, e, strictNormalForms);
}
/* Yes, this is a really bad idea... */
extern "C" {
unsigned long AT_calcAllocatedSize();

3
src/libexpr/eval.hh
View file

@ -56,8 +56,7 @@ Expr evalFile(EvalState & state, const Path & path);
attributes. If `canonicalise' is true, we remove things like
position information and make sure that attribute sets are in
sorded order. */
Expr strictEvalExpr(EvalState & state, Expr e,
bool canonicalise = false);
Expr strictEvalExpr(EvalState & state, Expr e);
/* Specific results. */
string evalString(EvalState & state, Expr e, PathSet & context);