%{/* Bison Grammar Parser -*- C -*-
- Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
02110-1301 USA
*/
+#include <config.h>
#include "system.h"
#include "complain.h"
#include "quotearg.h"
#include "reader.h"
#include "symlist.h"
+#include "strverscmp.h"
#define YYLLOC_DEFAULT(Current, Rhs, N) (Current) = lloc_default (Rhs, N)
static YYLTYPE lloc_default (YYLTYPE const *, int);
#define YY_LOCATION_PRINT(File, Loc) \
- location_print (File, Loc)
+ location_print (File, Loc)
+
+static void version_check (location const *loc, char const *version);
/* Request detailed syntax error messages, and pass them to GRAM_ERROR.
FIXME: depends on the undocumented availability of YYLLOC. */
#undef yyerror
#define yyerror(Msg) \
- gram_error (&yylloc, Msg)
+ gram_error (&yylloc, Msg)
static void gram_error (location const *, char const *);
static void add_param (char const *, char *, location);
static symbol_class current_class = unknown_sym;
static uniqstr current_type = 0;
-symbol *current_lhs;
-location current_lhs_location;
-assoc current_assoc;
+static symbol *current_lhs;
+static location current_lhs_location;
static int current_prec = 0;
+
+#ifdef UINT_FAST8_MAX
+# define YYTYPE_UINT8 uint_fast8_t
+#endif
+#ifdef INT_FAST8_MAX
+# define YYTYPE_INT8 int_fast8_t
+#endif
+#ifdef UINT_FAST16_MAX
+# define YYTYPE_UINT16 uint_fast16_t
+#endif
+#ifdef INT_FAST16_MAX
+# define YYTYPE_INT16 int_fast16_t
+#endif
%}
%debug
PERCENT_NO_DEFAULT_PREC "%no-default-prec"
PERCENT_NO_LINES "%no-lines"
PERCENT_NONDETERMINISTIC_PARSER
- "%nondeterministic-parser"
+ "%nondeterministic-parser"
PERCENT_OUTPUT "%output"
PERCENT_PARSE_PARAM "%parse-param {...}"
PERCENT_PURE_PARSER "%pure-parser"
+ PERCENT_REQUIRE "%require"
PERCENT_SKELETON "%skeleton"
PERCENT_START "%start"
PERCENT_TOKEN_TABLE "%token-table"
"%parse-param {...}"
"%printer {...}"
"%union {...}"
- BRACED_CODE action
PROLOGUE EPILOGUE
%printer { fprintf (stderr, "\"%s\"", $$); }
- STRING string_content
+ STRING string_content
%printer { fprintf (stderr, "{\n%s\n}", $$); }
"%destructor {...}"
"%initial-action {...}"
"%parse-param {...}"
"%printer {...}"
"%union {...}"
- BRACED_CODE action
PROLOGUE EPILOGUE
%type <uniqstr> TYPE
%printer { fprintf (stderr, "<%s>", $$); } TYPE
grammar_declaration
| PROLOGUE { prologue_augment ($1, @1); }
| "%debug" { debug_flag = true; }
-| "%define" string_content { muscle_insert ($2, "1"); }
+| "%define" string_content
+ {
+ static char one[] = "1";
+ muscle_insert ($2, one);
+ }
| "%define" string_content string_content { muscle_insert ($2, $3); }
| "%defines" { defines_flag = true; }
| "%error-verbose" { error_verbose = true; }
| "%expect-rr" INT { expected_rr_conflicts = $2; }
| "%file-prefix" "=" string_content { spec_file_prefix = $3; }
| "%glr-parser"
- {
- nondeterministic_parser = true;
- glr_parser = true;
- }
+ {
+ nondeterministic_parser = true;
+ glr_parser = true;
+ }
| "%initial-action {...}"
- {
- muscle_code_grow ("initial_action", $1, @1);
- }
+ {
+ muscle_code_grow ("initial_action", $1, @1);
+ }
| "%lex-param {...}" { add_param ("lex_param", $1, @1); }
| "%locations" { locations_flag = true; }
| "%name-prefix" "=" string_content { spec_name_prefix = $3; }
| "%output" "=" string_content { spec_outfile = $3; }
| "%parse-param {...}" { add_param ("parse_param", $1, @1); }
| "%pure-parser" { pure_parser = true; }
+| "%require" string_content { version_check (&@2, $2); }
| "%skeleton" string_content { skeleton = $2; }
| "%token-table" { token_table_flag = true; }
| "%verbose" { report_flag = report_states; }
}
| "%union {...}"
{
+ char const *body = $1;
+
+ if (typed)
+ {
+ /* Concatenate the union bodies, turning the first one's
+ trailing '}' into '\n', and omitting the second one's '{'. */
+ char *code = muscle_find ("stype");
+ code[strlen (code) - 1] = '\n';
+ body++;
+ }
+
typed = true;
- MUSCLE_INSERT_INT ("stype_line", @1.start.line);
- muscle_insert ("stype", $1);
+ muscle_code_grow ("stype", body, @1);
}
| "%destructor {...}" symbols.1
{
{
symbol_list *list;
for (list = $2; list; list = list->next)
- symbol_printer_set (list->sym, $1, list->location);
+ symbol_printer_set (list->sym, $1, @1);
symbol_list_free ($2);
}
| "%default-prec"
}
| ID
{
- symbol_class_set ($1, current_class, @1);
+ symbol_class_set ($1, current_class, @1, true);
symbol_type_set ($1, current_type, @1);
}
| ID INT
{
- symbol_class_set ($1, current_class, @1);
+ symbol_class_set ($1, current_class, @1, true);
symbol_type_set ($1, current_type, @1);
symbol_user_token_number_set ($1, $2, @2);
}
| ID string_as_id
{
- symbol_class_set ($1, current_class, @1);
+ symbol_class_set ($1, current_class, @1, true);
symbol_type_set ($1, current_type, @1);
symbol_make_alias ($1, $2, @$);
}
| ID INT string_as_id
{
- symbol_class_set ($1, current_class, @1);
+ symbol_class_set ($1, current_class, @1, true);
symbol_type_set ($1, current_type, @1);
symbol_user_token_number_set ($1, $2, @2);
symbol_make_alias ($1, $3, @$);
rules_or_grammar_declaration:
rules
| grammar_declaration ";"
- {
- if (yacc_flag)
- complain_at (@$, _("POSIX forbids declarations in the grammar"));
- }
| error ";"
{
yyerrok;
;
rhses.1:
- rhs { grammar_rule_end (@1); }
-| rhses.1 "|" rhs { grammar_rule_end (@3); }
+ rhs { grammar_current_rule_end (@1); }
+| rhses.1 "|" rhs { grammar_current_rule_end (@3); }
| rhses.1 ";"
;
rhs:
/* Nothing. */
- { grammar_rule_begin (current_lhs, current_lhs_location); }
+ { grammar_current_rule_begin (current_lhs, current_lhs_location); }
| rhs symbol
{ grammar_current_rule_symbol_append ($2, @2); }
| rhs action
- { grammar_current_rule_action_append ($2, @2); }
| rhs "%prec" symbol
{ grammar_current_rule_prec_set ($3, @3); }
| rhs "%dprec" INT
| string_as_id { $$ = $1; }
;
+/* Handle the semantics of an action specially, with a mid-rule
+ action, so that grammar_current_rule_action_append is invoked
+ immediately after the braced code is read by the scanner.
+
+ This implementation relies on the LALR(1) parsing algorithm.
+ If grammar_current_rule_action_append were executed in a normal
+ action for this rule, then when the input grammar contains two
+ successive actions, the scanner would have to read both actions
+ before reducing this rule. That wouldn't work, since the scanner
+ relies on all preceding input actions being processed by
+ grammar_current_rule_action_append before it scans the next
+ action. */
action:
+ { grammar_current_rule_action_append (last_string, last_braced_code_loc); }
BRACED_CODE
- { $$ = $1; }
;
/* A string used as an ID: quote it. */
STRING
{
$$ = symbol_get (quotearg_style (c_quoting_style, $1), @1);
- symbol_class_set ($$, token_sym, @1);
+ symbol_class_set ($$, token_sym, @1, false);
}
;
scanner_last_string_free ();
}
+static void
+version_check (location const *loc, char const *version)
+{
+ if (strverscmp (version, PACKAGE_VERSION) > 0)
+ {
+ complain_at (*loc, "require bison %s, but have %s",
+ version, PACKAGE_VERSION);
+ exit (63);
+ }
+}
+
static void
gram_error (location const *loc, char const *msg)
{
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