Future/bison
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/bison.git synced 2026-03-09 12:23:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

* data/yacc.c, data/glr.c, data/lal1.cc: Use similar code to

Browse Source 
generate verbose error messages.
Use the number of tokens as an upper bound in yytname, as it
cannot be a non terminal.
This commit is contained in:
Akim Demaille
2003-03-02 13:39:44 +00:00
parent d5286af19b
commit c47495657b
4 changed files with 37 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
data/glr.c
View File

@@ -613,14 +613,14 @@ yytokenName (yySymbol yytoken)
/** Fill in YYVSP[YYLOW1 .. YYLOW0-1] from the chain of states starting
* at YYVSP[YYLOW0].yystate.yypred. Leaves YYVSP[YYLOW1].yystate.yypred
* containing the pointer to the next state in the chain. Assumes
* containing the pointer to the next state in the chain. Assumes
* YYLOW1 < YYLOW0. For convenience, returns YYLOW1. */
static int
yyfill (yyGLRStackItem* yyvsp, int yylow0, int yylow1)
yyfill (yyGLRStackItem* yyvsp, int yylow0, int yylow1)
{
yyGLRState* s;
int i;
s = yyvsp[yylow0].yystate.yypred;
s = yyvsp[yylow0].yystate.yypred;
for (i = yylow0-1; i >= yylow1; i -= 1)
{
if (! s->yyresolved)
@@ -1022,7 +1022,7 @@ yyglrShift (yyGLRStack* yystack, int yyk, yyStateNum yylrState, size_t yyposn,
}
/** Shift stack #K of YYSTACK, to a new state corresponding to LR
* state YYLRSTATE, at input position YYPOSN, with the (unresolved)
* state YYLRSTATE, at input position YYPOSN, with the (unresolved)
* semantic value of YYRHS under the action for YYRULE. */
static inline void
yyglrShiftDefer (yyGLRStack* yystack, int yyk, yyStateNum yylrState,
@@ -1597,29 +1597,28 @@ yyreportSyntaxError (yyGLRStack* yystack,
#if YYERROR_VERBOSE
yySymbol* const yytokenp = yystack->yytokenp;
int yyn;
const char* yyprefix;
yyn = yypact[yystack->yytops.yystates[0]->yylrState];
if (YYPACT_NINF < yyn && yyn < YYLAST)
{
size_t yysize = 0;
const char* yyprefix;
char* yymsg;
int yyx;
/* Start YYX at -YYN if negative to avoid negative indexes in
YYCHECK. */
int yyxbase = yyn < 0 ? -yyn : 0;
int yyxbegin = yyn < 0 ? -yyn : 0;
/* Stay within bounds of both yycheck and yytname. */
int yychecklim = YYLAST - yyn;
int yynsyms = sizeof (yytname) / sizeof (yytname[0]);
int yyxlim = yychecklim < yynsyms ? yychecklim : yynsyms;
int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
int yycount = 0;
yyprefix = ", expecting ";
for (yyx = yyxbase; yyx < yyxlim && yycount < 5; yyx += 1)
for (yyx = yyxbegin; yyx < yyxend; ++yyx)
if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
{
yysize += strlen (yytokenName (yyx)) + strlen (yyprefix);
yysize += strlen (yyprefix) + strlen (yytokenName (yyx));
yycount += 1;
if (yycount == 5)
{
@@ -1640,7 +1639,7 @@ yyreportSyntaxError (yyGLRStack* yystack,
if (yycount < 5)
{
yyprefix = ", expecting ";
for (yyx = yyxbase; yyx < yyxlim; yyx += 1)
for (yyx = yyxbegin; yyx < yyxend; ++yyx)
if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
{
sprintf (yyp, "%s%s", yyprefix, yytokenName (yyx));

10
data/lalr1.cc
View File

@@ -498,13 +498,19 @@ b4_syncline([@oline@], [@ofile@])[
message += name_[ilooka_];
{
int count = 0;
for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x)
/* Start YYX at -YYN if negative to avoid negative indexes in
YYCHECK. */
int xbegin = n_ < 0 ? -n_ : 0;
/* Stay within bounds of both yycheck and yytname. */
int checklim = last_ - n_;
int xend = checklim < ntokens_ ? checklim : ntokens_;
for (int x = xbegin; x < xend; ++x)
if (check_[x + n_] == x && x != terror_)
++count;
if (count < 5)
{
count = 0;
for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x)
for (int x = xbegin; x < xend; ++x)
if (check_[x + n_] == x && x != terror_)
{
message += (!count++) ? ", expecting " : " or ";

27
data/yacc.c
View File

@@ -1038,32 +1038,30 @@ yyerrlab:
{
YYSIZE_T yysize = 0;
int yytype = YYTRANSLATE (yychar);
const char* yyprefix;
char *yymsg;
int yyx;
/* Start YYX at -YYN if negative to avoid negative indexes in
YYCHECK. */
int yyxbase = yyn < 0 ? -yyn : 0;
int yyxbegin = yyn < 0 ? -yyn : 0;
/* Stay within bounds of both yycheck and yytname. */
int yychecklim = YYLAST - yyn;
int yynsyms = sizeof (yytname) / sizeof (yytname[0]);
int yyxlim = yychecklim < yynsyms ? yychecklim : yynsyms;
int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
int yycount = 0;
for (yyx = yyxbase; yyx < yyxlim; yyx++)
yyprefix = ", expecting ";
for (yyx = yyxbegin; yyx < yyxend; ++yyx)
if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
{
yysize += (! yycount
? sizeof (", expecting ") - 1
: sizeof (" or ") - 1);
yysize += yystrlen (yytname[yyx]);
yycount++;
yysize += yystrlen (yyprefix) + yystrlen (yytname [yyx]);
yycount += 1;
if (yycount == 5)
{
yysize = 0;
break;
}
}
}
yysize += (sizeof ("syntax error, unexpected ")
+ yystrlen (yytname[yytype]));
@@ -1075,14 +1073,13 @@ yyerrlab:
if (yycount < 5)
{
yycount = 0;
for (yyx = yyxbase; yyx < yyxlim; yyx++)
yyprefix = ", expecting ";
for (yyx = yyxbegin; yyx < yyxend; ++yyx)
if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
{
const char *yyq = ! yycount ? ", expecting " : " or ";
yyp = yystpcpy (yyp, yyq);
yyp = yystpcpy (yyp, yyprefix);
yyp = yystpcpy (yyp, yytname[yyx]);
yycount++;
yyprefix = " or ";
}
}
yyerror (]b4_yyerror_args[yymsg);