-/* Bison Grammar Parser -*- C -*-
- Copyright (C) 2002 Free Software Foundation, Inc.
+%{/* Bison Grammar Parser -*- C -*-
+
+ Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301 USA
*/
-
-%debug
-%defines
-%locations
-%pure-parser
-// %error-verbose
-%defines
-%name-prefix="gram_"
-
-%{
+#include <config.h>
#include "system.h"
+
#include "complain.h"
-#include "muscle_tab.h"
+#include "conflicts.h"
#include "files.h"
#include "getargs.h"
-#include "output.h"
-#include "symlist.h"
#include "gram.h"
+#include "muscle_tab.h"
+#include "quotearg.h"
#include "reader.h"
-#include "conflicts.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)
+
+static void version_check (location const *loc, char const *version);
-/* Produce verbose parse errors. */
-#define YYERROR_VERBOSE 1
-#define YYLLOC_DEFAULT(Current, Rhs, N) \
-do { \
- if (N) \
- { \
- Current.first_column = Rhs[1].first_column; \
- Current.first_line = Rhs[1].first_line; \
- Current.last_column = Rhs[N].last_column; \
- Current.last_line = Rhs[N].last_line; \
- } \
- else \
- { \
- Current = Rhs[0]; \
- } \
-} while (0)
-
-/* Pass the control structure to YYPARSE and YYLEX. */
-#define YYPARSE_PARAM gram_control
-#define YYLEX_PARAM gram_control
-/* YYPARSE receives GRAM_CONTROL as a void *. Provide a
- correctly typed access to it. */
-#define yycontrol ((gram_control_t *) gram_control)
-
-/* Request detailed parse error messages, and pass them to
- GRAM_ERROR. */
+/* 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 (yycontrol, &yylloc, Msg)
-
-#define YYPRINT(File, Type, Value) \
- yyprint (File, Type, &Value)
-static void yyprint (FILE *file, int type, const yystype *value);
-
-symbol_class current_class = unknown_sym;
-char *current_type = 0;
-symbol_t *current_lhs;
-location_t current_lhs_location;
-associativity current_assoc;
-int current_prec = 0;
-braced_code_t current_braced_code = action_braced_code;
+ 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;
+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
+%verbose
+%defines
+%locations
+%pure-parser
+%error-verbose
+%defines
+%name-prefix="gram_"
+
+%initial-action
+{
+ /* Bison's grammar can initial empty locations, hence a default
+ location is needed. */
+ @$.start.file = @$.end.file = current_file;
+ @$.start.line = @$.end.line = 1;
+ @$.start.column = @$.end.column = 0;
+}
/* Only NUMBERS have a value. */
%union
{
- symbol_t *symbol;
- symbol_list_t *list;
+ symbol *symbol;
+ symbol_list *list;
int integer;
- char *string;
- associativity assoc;
+ char *chars;
+ assoc assoc;
+ uniqstr uniqstr;
};
-/* Define the tokens together with there human representation. */
-%token GRAM_EOF 0 "end of string"
-%token STRING CHARACTER
-%token INT
+/* Define the tokens together with their human representation. */
+%token GRAM_EOF 0 "end of file"
+%token STRING "string"
+%token INT "integer"
%token PERCENT_TOKEN "%token"
%token PERCENT_NTERM "%nterm"
%token PERCENT_TYPE "%type"
-%token PERCENT_DESTRUCTOR "%destructor"
-%token PERCENT_PRINTER "%printer"
+%token PERCENT_DESTRUCTOR "%destructor {...}"
+%token PERCENT_PRINTER "%printer {...}"
-%token PERCENT_UNION "%union"
+%token PERCENT_UNION "%union {...}"
%token PERCENT_LEFT "%left"
%token PERCENT_RIGHT "%right"
%token PERCENT_NONASSOC "%nonassoc"
-%token PERCENT_EXPECT "%expect"
-%token PERCENT_START "%start"
-%token PERCENT_PREC "%prec"
-%token PERCENT_DPREC "%dprec"
-%token PERCENT_MERGE "%merge"
-%token PERCENT_VERBOSE "%verbose"
-%token PERCENT_ERROR_VERBOSE "%error-verbose"
-
-%token PERCENT_OUTPUT "%output"
-%token PERCENT_FILE_PREFIX "%file-prefix"
-%token PERCENT_NAME_PREFIX "%name-prefix"
-
-%token PERCENT_DEFINE "%define"
-%token PERCENT_PURE_PARSER "%pure-parser"
-%token PERCENT_GLR_PARSER "%glr-parser"
-
-%token PERCENT_DEFINES "%defines"
-
-%token PERCENT_YACC "%yacc"
-
-%token PERCENT_DEBUG "%debug"
-%token PERCENT_LOCATIONS "%locations"
-%token PERCENT_NO_LINES "%no-lines"
-%token PERCENT_SKELETON "%skeleton"
-%token PERCENT_TOKEN_TABLE "%token-table"
-
-%token TYPE
-%token EQUAL "="
-%token SEMICOLON ";"
-%token COLON ":"
-%token PIPE "|"
-%token ID "identifier"
-%token PERCENT_PERCENT "%%"
-%token PROLOGUE EPILOGUE
-%token BRACED_CODE
+%token PERCENT_PREC "%prec"
+%token PERCENT_DPREC "%dprec"
+%token PERCENT_MERGE "%merge"
+
+
+/*----------------------.
+| Global Declarations. |
+`----------------------*/
+
+%token
+ PERCENT_DEBUG "%debug"
+ PERCENT_DEFAULT_PREC "%default-prec"
+ PERCENT_DEFINE "%define"
+ PERCENT_DEFINES "%defines"
+ PERCENT_ERROR_VERBOSE "%error-verbose"
+ PERCENT_EXPECT "%expect"
+ PERCENT_EXPECT_RR "%expect-rr"
+ PERCENT_FILE_PREFIX "%file-prefix"
+ PERCENT_GLR_PARSER "%glr-parser"
+ PERCENT_INITIAL_ACTION "%initial-action {...}"
+ PERCENT_LEX_PARAM "%lex-param {...}"
+ PERCENT_LOCATIONS "%locations"
+ PERCENT_NAME_PREFIX "%name-prefix"
+ PERCENT_NO_DEFAULT_PREC "%no-default-prec"
+ PERCENT_NO_LINES "%no-lines"
+ PERCENT_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"
+ PERCENT_VERBOSE "%verbose"
+ PERCENT_YACC "%yacc"
+;
-%type <string> CHARACTER TYPE STRING string_content
- BRACED_CODE PROLOGUE EPILOGUE epilogue.opt action
+%token TYPE "type"
+%token EQUAL "="
+%token SEMICOLON ";"
+%token PIPE "|"
+%token ID "identifier"
+%token ID_COLON "identifier:"
+%token PERCENT_PERCENT "%%"
+%token PROLOGUE "%{...%}"
+%token EPILOGUE "epilogue"
+%token BRACED_CODE "{...}"
+
+
+%type <chars> STRING string_content
+ "%destructor {...}"
+ "%initial-action {...}"
+ "%lex-param {...}"
+ "%parse-param {...}"
+ "%printer {...}"
+ "%union {...}"
+ PROLOGUE EPILOGUE
+%printer { fprintf (stderr, "\"%s\"", $$); }
+ STRING string_content
+%printer { fprintf (stderr, "{\n%s\n}", $$); }
+ "%destructor {...}"
+ "%initial-action {...}"
+ "%lex-param {...}"
+ "%parse-param {...}"
+ "%printer {...}"
+ "%union {...}"
+ PROLOGUE EPILOGUE
+%type <uniqstr> TYPE
+%printer { fprintf (stderr, "<%s>", $$); } TYPE
%type <integer> INT
+%printer { fprintf (stderr, "%d", $$); } INT
%type <symbol> ID symbol string_as_id
+%printer { fprintf (stderr, "%s", $$->tag); } ID symbol string_as_id
+%type <symbol> ID_COLON
+%printer { fprintf (stderr, "%s:", $$->tag); } ID_COLON
%type <assoc> precedence_declarator
%type <list> symbols.1
%%
input:
declarations "%%" grammar epilogue.opt
- {
- yycontrol->errcode = 0;
- epilogue_set ($4, @4);
- }
;
declarations:
/* Nothing */
-| declarations declaration semi_colon.opt
+| declarations declaration
;
declaration:
grammar_declaration
| PROLOGUE { prologue_augment ($1, @1); }
-| "%debug" { debug_flag = 1; }
+| "%debug" { debug_flag = true; }
+| "%define" string_content
+ {
+ static char one[] = "1";
+ muscle_insert ($2, one);
+ }
| "%define" string_content string_content { muscle_insert ($2, $3); }
-| "%defines" { defines_flag = 1; }
-| "%error-verbose" { error_verbose = 1; }
-| "%expect" INT { expected_conflicts = $2; }
+| "%defines" { defines_flag = true; }
+| "%error-verbose" { error_verbose = true; }
+| "%expect" INT { expected_sr_conflicts = $2; }
+| "%expect-rr" INT { expected_rr_conflicts = $2; }
| "%file-prefix" "=" string_content { spec_file_prefix = $3; }
-| "%locations" { locations_flag = 1; }
+| "%glr-parser"
+ {
+ nondeterministic_parser = true;
+ glr_parser = true;
+ }
+| "%initial-action {...}"
+ {
+ 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; }
-| "%no-lines" { no_lines_flag = 1; }
+| "%no-lines" { no_lines_flag = true; }
+| "%nondeterministic-parser" { nondeterministic_parser = true; }
| "%output" "=" string_content { spec_outfile = $3; }
-| "%pure-parser" { pure_parser = 1; }
-| "%glr-parser" { glr_parser = 1; }
+| "%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 = 1; }
-| "%verbose" { report_flag = 1; }
-| "%yacc" { yacc_flag = 1; }
+| "%token-table" { token_table_flag = true; }
+| "%verbose" { report_flag = report_states; }
+| "%yacc" { yacc_flag = true; }
+| /*FIXME: Err? What is this horror doing here? */ ";"
;
grammar_declaration:
{
grammar_start_symbol_set ($2, @2);
}
-| "%union" BRACED_CODE
+| "%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_code_grow ("stype", body, @1);
+ }
+| "%destructor {...}" symbols.1
+ {
+ symbol_list *list;
+ for (list = $2; list; list = list->next)
+ symbol_destructor_set (list->sym, $1, @1);
+ symbol_list_free ($2);
+ }
+| "%printer {...}" symbols.1
{
- typed = 1;
- MUSCLE_INSERT_INT ("stype_line", @2.first_line);
- muscle_insert ("stype", $2);
+ symbol_list *list;
+ for (list = $2; list; list = list->next)
+ symbol_printer_set (list->sym, $1, @1);
+ symbol_list_free ($2);
}
-| "%destructor"
- { current_braced_code = destructor_braced_code; }
- BRACED_CODE symbols.1
+| "%default-prec"
{
- symbol_list_t *list;
- for (list = $4; list; list = list->next)
- symbol_destructor_set (list->sym, $3, @3);
- symbol_list_free ($4);
- current_braced_code = action_braced_code;
+ default_prec = true;
}
-| "%printer"
- { current_braced_code = printer_braced_code; }
- BRACED_CODE symbols.1
+| "%no-default-prec"
{
- symbol_list_t *list;
- for (list = $4; list; list = list->next)
- symbol_printer_set (list->sym, $3, list->location);
- symbol_list_free ($4);
- current_braced_code = action_braced_code;
+ default_prec = false;
}
;
}
| "%type" TYPE symbols.1
{
- symbol_list_t *list;
+ symbol_list *list;
for (list = $3; list; list = list->next)
symbol_type_set (list->sym, $2, @2);
symbol_list_free ($3);
precedence_declaration:
precedence_declarator type.opt symbols.1
{
- symbol_list_t *list;
+ symbol_list *list;
++current_prec;
for (list = $3; list; list = list->next)
{
;
type.opt:
- /* Nothing. */ { current_type = NULL;}
+ /* Nothing. */ { current_type = NULL; }
| TYPE { current_type = $1; }
;
}
| 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, $3, @$);
/* One or more symbol definitions. */
symbol_defs.1:
symbol_def
- {;}
| symbol_defs.1 symbol_def
- {;}
;
;
/* As a Bison extension, one can use the grammar declarations in the
- body of the grammar. But to remain LALR(1), they must be ended
- with a semi-colon. */
+ body of the grammar. */
rules_or_grammar_declaration:
rules
| grammar_declaration ";"
- {
- if (yacc_flag)
- complain_at (@$, _("POSIX forbids declarations in the grammar"));
- }
| error ";"
{
yyerrok;
;
rules:
- ID ":" { current_lhs = $1; current_lhs_location = @1; } rhses.1 ";"
- {;}
+ ID_COLON { current_lhs = $1; current_lhs_location = @1; } rhses.1
;
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
symbol:
ID { $$ = $1; }
| string_as_id { $$ = $1; }
-| CHARACTER { $$ = symbol_get ($1, @1); }
;
+/* Handle the semantics of an action specially, with a mid-rule
+ action, so that grammar_current_rule_action_append is invoked
+ immediately after the braced code is read by the scanner.
+
+ This implementation relies on the LALR(1) parsing algorithm.
+ If grammar_current_rule_action_append were executed in a normal
+ action for this rule, then when the input grammar contains two
+ successive actions, the scanner would have to read both actions
+ before reducing this rule. That wouldn't work, since the scanner
+ relies on all preceding input actions being processed by
+ grammar_current_rule_action_append before it scans the next
+ action. */
action:
+ { grammar_current_rule_action_append (last_string, last_braced_code_loc); }
BRACED_CODE
- { $$ = $1; }
;
-/* A string used as an ID: we have to keep the quotes. */
+/* A string used as an ID: quote it. */
string_as_id:
STRING
{
- $$ = symbol_get ($1, @1);
- symbol_class_set ($$, token_sym, @1);
+ $$ = symbol_get (quotearg_style (c_quoting_style, $1), @1);
+ symbol_class_set ($$, token_sym, @1, false);
}
;
-/* A string used for its contents. Strip the quotes. */
+/* A string used for its contents. Don't quote it. */
string_content:
STRING
- {
- $$ = $1 + 1;
- $$[strlen ($$) - 1] = '\0';
- };
+ { $$ = $1; }
+;
epilogue.opt:
/* Nothing. */
- {
- $$ = xstrdup ("");
- }
| "%%" EPILOGUE
{
- $$ = $2;
+ muscle_code_grow ("epilogue", $2, @2);
+ scanner_last_string_free ();
}
;
-semi_colon.opt:
- /* Nothing. */
-| ";"
-;
%%
-/*------------------------------------------------------------------.
-| When debugging the parser, display tokens' locations and values. |
-`------------------------------------------------------------------*/
+
+
+/* Return the location of the left-hand side of a rule whose
+ right-hand side is RHS[1] ... RHS[N]. Ignore empty nonterminals in
+ the right-hand side, and return an empty location equal to the end
+ boundary of RHS[0] if the right-hand side is empty. */
+
+static YYLTYPE
+lloc_default (YYLTYPE const *rhs, int n)
+{
+ int i;
+ YYLTYPE loc;
+
+ /* SGI MIPSpro 7.4.1m miscompiles "loc.start = loc.end = rhs[n].end;".
+ The bug is fixed in 7.4.2m, but play it safe for now. */
+ loc.start = rhs[n].end;
+ loc.end = rhs[n].end;
+
+ /* Ignore empty nonterminals the start of the the right-hand side.
+ Do not bother to ignore them at the end of the right-hand side,
+ since empty nonterminals have the same end as their predecessors. */
+ for (i = 1; i <= n; i++)
+ if (! equal_boundaries (rhs[i].start, rhs[i].end))
+ {
+ loc.start = rhs[i].start;
+ break;
+ }
+
+ return loc;
+}
+
+
+/* Add a lex-param or a parse-param (depending on TYPE) with
+ declaration DECL and location LOC. */
+
+static void
+add_param (char const *type, char *decl, location loc)
+{
+ static char const alphanum[26 + 26 + 1 + 10] =
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "_"
+ "0123456789";
+ char const *name_start = NULL;
+ char *p;
+
+ /* Stop on last actual character. */
+ for (p = decl; p[1]; p++)
+ if ((p == decl
+ || ! memchr (alphanum, p[-1], sizeof alphanum))
+ && memchr (alphanum, p[0], sizeof alphanum - 10))
+ name_start = p;
+
+ /* Strip the surrounding '{' and '}', and any blanks just inside
+ the braces. */
+ while (*--p == ' ' || *p == '\t')
+ continue;
+ p[1] = '\0';
+ while (*++decl == ' ' || *decl == '\t')
+ continue;
+
+ if (! name_start)
+ complain_at (loc, _("missing identifier in parameter declaration"));
+ else
+ {
+ char *name;
+ size_t name_len;
+
+ for (name_len = 1;
+ memchr (alphanum, name_start[name_len], sizeof alphanum);
+ name_len++)
+ continue;
+
+ name = xmalloc (name_len + 1);
+ memcpy (name, name_start, name_len);
+ name[name_len] = '\0';
+ muscle_pair_list_grow (type, decl, name);
+ free (name);
+ }
+
+ scanner_last_string_free ();
+}
static void
-yyprint (FILE *file,
- int type, const yystype *value)
+version_check (location const *loc, char const *version)
{
- fputc (' ', file);
- switch (type)
+ if (strverscmp (version, PACKAGE_VERSION) > 0)
{
- case CHARACTER:
- fprintf (file, " = '%s'", value->string);
- break;
-
- case ID:
- fprintf (file, " = %s", value->symbol->tag);
- break;
-
- case INT:
- fprintf (file, " = %d", value->integer);
- break;
-
- case STRING:
- fprintf (file, " = \"%s\"", value->string);
- break;
-
- case TYPE:
- fprintf (file, " = <%s>", value->string);
- break;
-
- case BRACED_CODE:
- case PROLOGUE:
- case EPILOGUE:
- fprintf (file, " = {{ %s }}", value->string);
- break;
+ complain_at (*loc, "require bison %s, but have %s",
+ version, PACKAGE_VERSION);
+ exit (63);
}
}
-void
-gram_error (gram_control_t *control ATTRIBUTE_UNUSED,
- location_t *yylloc, const char *msg)
+static void
+gram_error (location const *loc, char const *msg)
+{
+ complain_at (*loc, "%s", msg);
+}
+
+char const *
+token_name (int type)
{
- complain_at (*yylloc, "%s", msg);
+ return yytname[YYTRANSLATE (type)];
}
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