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glr.c: comment changes

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* data/skeletons/glr.c (yycompressStack): Reduce scope, and import some
nice comments from glr2.cc.
This commit is contained in:
Akim Demaille
2020-12-13 08:28:09 +01:00
parent b2d35f5cb8
commit c97dbc46af
1 changed files with 11 additions and 5 deletions
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16
data/skeletons/glr.c
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@@ -1967,18 +1967,24 @@ yyresolveStack (yyGLRStack* yystackp]b4_user_formals[)
return yyok; return yyok;
} }
/** Called when returning to deterministic operation to clean up the extra
* stacks. */
static void static void
yycompressStack (yyGLRStack* yystackp) yycompressStack (yyGLRStack* yystackp)
{ {
yyGLRState* yyp, *yyq, *yyr; /* yyr is the state after the split point. */
yyGLRState *yyr;
if (yystackp->yytops.yysize != 1 || yystackp->yysplitPoint == YY_NULLPTR) if (yystackp->yytops.yysize != 1 || yystackp->yysplitPoint == YY_NULLPTR)
return; return;
for (yyp = yystackp->yytops.yystates[0], yyq = yyp->yypred, yyr = YY_NULLPTR; {
yyp != yystackp->yysplitPoint; yyGLRState *yyp, *yyq;
yyr = yyp, yyp = yyq, yyq = yyp->yypred) for (yyp = yystackp->yytops.yystates[0], yyq = yyp->yypred, yyr = YY_NULLPTR;
yyp->yypred = yyr; yyp != yystackp->yysplitPoint;
yyr = yyp, yyp = yyq, yyq = yyp->yypred)
yyp->yypred = yyr;
}
yystackp->yyspaceLeft += yystackp->yynextFree - yystackp->yyitems; yystackp->yyspaceLeft += yystackp->yynextFree - yystackp->yyitems;
yystackp->yynextFree = YY_REINTERPRET_CAST (yyGLRStackItem*, yystackp->yysplitPoint) + 1; yystackp->yynextFree = YY_REINTERPRET_CAST (yyGLRStackItem*, yystackp->yysplitPoint) + 1;