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When reducing initial empty rules, Bison parser read an initial

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location that is not defined.  This results in garbage, and that
affects Bison's own parser.  Therefore we need (i) to extend Bison
to support a means to initialize this location, and (ii) to use
this CVS Bison to fix CVS Bison's parser.
* src/reader.h, reader.c (epilogue_augment): Remove, replace
with...
* src/muscle_tab.h, src/muscle_tab.c (muscle_code_grow): this.
* src/parse-gram.y: Adjust.
(%initial-action): New.
(%error-verbose): Since we require CVS Bison, there is no reason
not to use it.
* src/scan-gram.l: Adjust.
* src/Makefile.am (YACC): New, to make sure we use our own parser.
* data/yacc.c (yyparse): Use b4_initial_action.
This commit is contained in:
Akim Demaille
2003-08-25 15:16:25 +00:00
parent 388f8b197d
commit cd3684cfa8
12 changed files with 524 additions and 434 deletions
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23
src/scan-gram.l
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@@ -190,6 +190,7 @@ splice (\\[ \f\t\v]*\n)*
"%expect" return PERCENT_EXPECT;
"%file-prefix" return PERCENT_FILE_PREFIX;
"%fixed"[-_]"output"[-_]"files" return PERCENT_YACC;
"%initial-action" token_type = PERCENT_INITIAL_ACTION; BEGIN SC_PRE_CODE;
"%glr-parser" return PERCENT_GLR_PARSER;
"%left" return PERCENT_LEFT;
"%lex-param" token_type = PERCENT_LEX_PARAM; BEGIN SC_PRE_CODE;
@@ -649,8 +650,8 @@ splice (\\[ \f\t\v]*\n)*
%%
/* Keeps track of the maximum number of semantic values to the left of
a handle (those referenced by $0, $-1, etc.) are required by the
/* Keeps track of the maximum number of semantic values to the left of
a handle (those referenced by $0, $-1, etc.) are required by the
semantic actions of this grammar. */
int max_left_semantic_context = 0;
@@ -807,10 +808,10 @@ handle_action_dollar (char *text, location loc)
}
/*-----------------------------------------------------------------.
| Dispatch onto handle_action_dollar, or handle_destructor_dollar, |
| depending upon TOKEN_TYPE. |
`-----------------------------------------------------------------*/
/*----------------------------------------------------------------.
| Map `$?' onto the proper M4 symbol, depending on its TOKEN_TYPE |
| (are we in an action?). |
`----------------------------------------------------------------*/
static void
handle_dollar (int token_type, char *text, location loc)
@@ -823,6 +824,7 @@ handle_dollar (int token_type, char *text, location loc)
break;
case PERCENT_DESTRUCTOR:
case PERCENT_INITIAL_ACTION:
case PERCENT_PRINTER:
if (text[1] == '$')
{
@@ -875,10 +877,10 @@ handle_action_at (char *text, location loc)
}
/*-------------------------------------------------------------------.
| Dispatch onto handle_action_at, or handle_destructor_at, depending |
| upon CODE_KIND. |
`-------------------------------------------------------------------*/
/*----------------------------------------------------------------.
| Map `@?' onto the proper M4 symbol, depending on its TOKEN_TYPE |
| (are we in an action?). |
`----------------------------------------------------------------*/
static void
handle_at (int token_type, char *text, location loc)
@@ -889,6 +891,7 @@ handle_at (int token_type, char *text, location loc)
handle_action_at (text, loc);
return;
case PERCENT_INITIAL_ACTION:
case PERCENT_DESTRUCTOR:
case PERCENT_PRINTER:
if (text[1] == '$')