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Disabling some simplifications that interact badly with GC.

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Based on error report from Alan Watson.  Revisit this later.
This commit is contained in:
Alex Shinn 2013-05-29 21:01:41 +09:00
parent b10cb94e17
commit 5ba723333f
1 changed files with 16 additions and 9 deletions
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25
simplify.c
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@ -1,5 +1,5 @@
/* simplify.c -- basic simplification pass */
/* Copyright (c) 2010-2012 Alex Shinn. All rights reserved. */
/* Copyright (c) 2010-2013 Alex Shinn. All rights reserved. */
/* BSD-style license: http://synthcode.com/license.txt */
#include "chibi/eval.h"
@ -12,12 +12,13 @@ static sexp simplify (sexp ctx, sexp ast, sexp init_substs, sexp lambda) {
int check;
sexp ls1, ls2, p1, p2, sv;
sexp_gc_var5(res, substs, tmp, app, ctx2);
if (!sexp_pointerp(ast))
return ast;
sexp_gc_preserve5(ctx, res, substs, tmp, app, ctx2);
res = ast; /* return the ast as-is by default */
substs = init_substs;
loop:
switch (sexp_pointerp(res) ? sexp_pointer_tag(res) : 0) {
switch (sexp_pointer_tag(res)) {
case SEXP_PAIR:
/* don't simplify the operator if it's a lambda because we
@ -63,11 +64,13 @@ static sexp simplify (sexp ctx, sexp ast, sexp init_substs, sexp lambda) {
ls1 = app;
ls2 = sexp_cdr(app);
sv = sexp_lambda_sv(sexp_car(app));
/* inline constants and immutable references */
if (sexp_length(ctx, p2) == sexp_length(ctx, ls2)) {
for ( ; sexp_pairp(ls2); ls2=sexp_cdr(ls2), p2=sexp_cdr(p2)) {
if (sexp_not(sexp_memq(ctx, sexp_car(p2), sv))
&& (! sexp_pointerp(sexp_car(ls2)) || sexp_litp(sexp_car(ls2))
|| (sexp_refp(sexp_car(ls2))
/* disable inline references for now */
|| (0 && sexp_refp(sexp_car(ls2))
&& sexp_lambdap(sexp_ref_loc(sexp_car(ls2)))
&& sexp_not(sexp_memq(ctx, sexp_ref_name(sexp_car(ls2)),
sexp_lambda_sv(sexp_ref_loc(sexp_car(ls2)))))))) {
@ -86,10 +89,14 @@ static sexp simplify (sexp ctx, sexp ast, sexp init_substs, sexp lambda) {
}
sexp_lambda_body(sexp_car(app))
= simplify(ctx, sexp_lambda_body(sexp_car(app)), substs, sexp_car(app));
if (sexp_nullp(sexp_cdr(app))
&& sexp_nullp(sexp_lambda_params(sexp_car(app)))
&& sexp_nullp(sexp_lambda_defs(sexp_car(app))))
app = sexp_lambda_body(sexp_car(app));
/* TODO: Revisit this - it causes GC problems in rare cases. */
/* if (sexp_nullp(sexp_cdr(app)) */
/* && sexp_nullp(sexp_lambda_params(sexp_car(app))) */
/* && sexp_nullp(sexp_lambda_defs(sexp_car(app)))) */
/* app = sexp_lambda_body(sexp_car(app)); */
} else if (sexp_lambdap(sexp_car(app))) {
sexp_lambda_body(sexp_car(app))
= simplify(ctx, sexp_lambda_body(sexp_car(app)), substs, sexp_car(app));
}
}
res = app;
@ -104,7 +111,7 @@ static sexp simplify (sexp ctx, sexp ast, sexp init_substs, sexp lambda) {
if (sexp_litp(tmp) || ! sexp_pointerp(tmp)) {
res = sexp_not((sexp_litp(tmp) ? sexp_lit_value(tmp) : tmp))
? sexp_cnd_fail(res) : sexp_cnd_pass(res);
goto loop;
res = simplify(ctx, res, substs, lambda);
} else {
sexp_cnd_test(res) = tmp;
simplify_it(sexp_cnd_pass(res));