-/* Input parser for bison
- Copyright (C) 1984, 1986, 1989, 1992, 1998, 2000, 2001, 2002
+/* Input parser for Bison
+
+ Copyright (C) 1984, 1986, 1989, 1992, 1998, 2000, 2001, 2002, 2003
Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-
#include "system.h"
-#include "quotearg.h"
-#include "quote.h"
-#include "getargs.h"
+
+#include <quotearg.h>
+
+#include "complain.h"
+#include "conflicts.h"
#include "files.h"
-#include "symtab.h"
-#include "options.h"
-#include "lex.h"
+#include "getargs.h"
#include "gram.h"
-#include "complain.h"
+#include "muscle_tab.h"
#include "output.h"
#include "reader.h"
-#include "conflicts.h"
-#include "muscle_tab.h"
-
-typedef struct symbol_list
-{
- struct symbol_list *next;
- symbol_t *sym;
- int line;
-
- /* The action is attached to the LHS of a rule. */
- const char *action;
- int action_line;
-
- symbol_t *ruleprec;
-} symbol_list;
+#include "symlist.h"
+#include "symtab.h"
-int lineno;
static symbol_list *grammar = NULL;
-static int start_flag = 0;
-
-/* Nonzero if %union has been seen. */
-static int typed = 0;
-
-/* Incremented for each %left, %right or %nonassoc seen */
-static int lastprec = 0;
-
-static symbol_list *
-symbol_list_new (symbol_t *sym)
-{
- symbol_list *res = XMALLOC (symbol_list, 1);
- res->next = NULL;
- res->sym = sym;
- res->line = lineno;
- res->action = NULL;
- res->action_line = 0;
- res->ruleprec = NULL;
- return res;
-}
-
-/*===================\
-| Low level lexing. |
-\===================*/
-
-static void
-skip_to_char (int target)
-{
- int c;
- if (target == '\n')
- complain (_(" Skipping to next \\n"));
- else
- complain (_(" Skipping to next %c"), target);
-
- do
- c = skip_white_space ();
- while (c != target && c != EOF);
- if (c != EOF)
- ungetc (c, finput);
-}
-
-
-/*---------------------------------------------------------.
-| Read a signed integer from STREAM and return its value. |
-`---------------------------------------------------------*/
-
-static inline int
-read_signed_integer (FILE *stream)
-{
- int c = getc (stream);
- int sign = 1;
- int n = 0;
-
- if (c == '-')
- {
- c = getc (stream);
- sign = -1;
- }
-
- while (isdigit (c))
- {
- n = 10 * n + (c - '0');
- c = getc (stream);
- }
-
- ungetc (c, stream);
-
- return sign * n;
-}
-\f
-/*--------------------------------------------------------------.
-| Get the data type (alternative in the union) of the value for |
-| symbol N in rule RULE. |
-`--------------------------------------------------------------*/
-
-static char *
-get_type_name (int n, symbol_list *rule)
-{
- int i;
- symbol_list *rp;
-
- if (n < 0)
- {
- complain (_("invalid $ value"));
- return NULL;
- }
-
- rp = rule;
- i = 0;
-
- while (i < n)
- {
- rp = rp->next;
- if (rp == NULL || rp->sym == NULL)
- {
- complain (_("invalid $ value"));
- return NULL;
- }
- ++i;
- }
-
- return rp->sym->type_name;
-}
-\f
-/*------------------------------------------------------------------.
-| Copy the character C to OOUT, and insert quadigraphs when needed. |
-`------------------------------------------------------------------*/
-
-static inline void
-copy_character (struct obstack *oout, int c)
-{
- switch (c)
- {
- case '[':
- obstack_sgrow (oout, "@<:@");
- break;
-
- case ']':
- obstack_sgrow (oout, "@:>@");
- break;
-
- default:
- obstack_1grow (oout, c);
- }
-}
-
-/*------------------------------------------------------------.
-| Dump the string from FIN to OOUT if non null. MATCH is the |
-| delimiter of the string (either ' or "). |
-`------------------------------------------------------------*/
-
-static inline void
-copy_string2 (FILE *fin, struct obstack *oout, int match, int store)
-{
- int c;
-
- if (store)
- obstack_1grow (oout, match);
-
- c = getc (fin);
-
- while (c != match)
- {
- if (c == EOF)
- fatal (_("unterminated string at end of file"));
- if (c == '\n')
- {
- complain (_("unterminated string"));
- ungetc (c, fin);
- c = match; /* invent terminator */
- continue;
- }
-
- copy_character (oout, c);
-
- if (c == '\\')
- {
- c = getc (fin);
- if (c == EOF)
- fatal (_("unterminated string at end of file"));
- copy_character (oout, c);
-
- if (c == '\n')
- ++lineno;
- }
-
- c = getc (fin);
- }
-
- if (store)
- obstack_1grow (oout, c);
-}
-
-/* FIXME. */
-
-static inline void
-copy_string (FILE *fin, struct obstack *oout, int match)
-{
- copy_string2 (fin, oout, match, 1);
-}
-
-/* FIXME. */
-
-static inline void
-copy_identifier (FILE *fin, struct obstack *oout)
-{
- int c;
-
- while (isalnum (c = getc (fin)) || c == '_')
- obstack_1grow (oout, c);
-
- ungetc (c, fin);
-}
-
-
-/*------------------------------------------------------------------.
-| Dump the wannabee comment from IN to OOUT. In fact we just saw a |
-| `/', which might or might not be a comment. In any case, copy |
-| what we saw. |
-`------------------------------------------------------------------*/
-
-static inline void
-copy_comment (FILE *fin, struct obstack *oout)
-{
- int cplus_comment;
- int ended;
- int c;
-
- /* We read a `/', output it. */
- obstack_1grow (oout, '/');
-
- switch ((c = getc (fin)))
- {
- case '/':
- cplus_comment = 1;
- break;
- case '*':
- cplus_comment = 0;
- break;
- default:
- ungetc (c, fin);
- return;
- }
-
- obstack_1grow (oout, c);
- c = getc (fin);
-
- ended = 0;
- while (!ended)
- {
- if (!cplus_comment && c == '*')
- {
- while (c == '*')
- {
- obstack_1grow (oout, c);
- c = getc (fin);
- }
-
- if (c == '/')
- {
- obstack_1grow (oout, c);
- ended = 1;
- }
- }
- else if (c == '\n')
- {
- ++lineno;
- obstack_1grow (oout, c);
- if (cplus_comment)
- ended = 1;
- else
- c = getc (fin);
- }
- else if (c == EOF)
- fatal (_("unterminated comment"));
- else
- {
- copy_character (oout, c);
- c = getc (fin);
- }
- }
-}
-
-
-/*-------------------------------------------------------------------.
-| FIN is pointing to a location (i.e., a `@'). Output to OOUT a |
-| reference to this location. RULE_LENGTH is the number of values in |
-| the current rule so far, which says where to find `$0' with |
-| respect to the top of the stack. |
-`-------------------------------------------------------------------*/
-
-static inline void
-copy_at (FILE *fin, struct obstack *oout, int rule_length)
-{
- int c = getc (fin);
- locations_flag = 1;
-
- if (c == '$')
- {
- obstack_sgrow (oout, "]b4_lhs_location[");
- }
- else if (isdigit (c) || c == '-')
- {
- int n;
-
- ungetc (c, fin);
- n = read_signed_integer (fin);
- if (n > rule_length)
- complain (_("invalid value: %s%d"), "@", n);
- else
- obstack_fgrow2 (oout, "]b4_rhs_location([%d], [%d])[",
- rule_length, n);
- }
- else
- {
- char buf[] = "@c";
- buf[1] = c;
- complain (_("%s is invalid"), quote (buf));
- }
-}
-
-
-/*------------------------------------------------------------------.
-| FIN is pointing to a wannabee semantic value (i.e., a `$'). |
-| |
-| Possible inputs: $[<TYPENAME>]($|integer) |
-| |
-| Output to OOUT a reference to this semantic value. RULE_LENGTH is |
-| the number of values in the current rule so far, which says where |
-| to find `$0' with respect to the top of the stack. |
-`------------------------------------------------------------------*/
-
-static inline void
-copy_dollar (FILE *fin, struct obstack *oout,
- symbol_list *rule, int rule_length)
-{
- int c = getc (fin);
- const char *type_name = NULL;
-
- /* Get the type name if explicit. */
- if (c == '<')
- {
- read_type_name (fin);
- type_name = token_buffer;
- c = getc (fin);
- }
+static bool start_flag = false;
+merger_list *merge_functions;
- if (c == '$')
- {
- if (!type_name)
- type_name = get_type_name (0, rule);
- if (!type_name && typed)
- complain (_("$$ of `%s' has no declared type"),
- rule->sym->tag);
- if (!type_name)
- type_name = "";
- obstack_fgrow1 (oout,
- "]b4_lhs_value([%s])[", type_name);
- }
- else if (isdigit (c) || c == '-')
- {
- int n;
- ungetc (c, fin);
- n = read_signed_integer (fin);
+/* Has %union been seen? */
+bool typed = false;
- if (n > rule_length)
- complain (_("invalid value: %s%d"), "$", n);
- else
- {
- if (!type_name && n > 0)
- type_name = get_type_name (n, rule);
- if (!type_name && typed)
- complain (_("$%d of `%s' has no declared type"),
- n, rule->sym->tag);
- if (!type_name)
- type_name = "";
- obstack_fgrow3 (oout, "]b4_rhs_value([%d], [%d], [%s])[",
- rule_length, n, type_name);
- }
- }
- else
- {
- char buf[] = "$c";
- buf[1] = c;
- complain (_("%s is invalid"), quote (buf));
- }
-}
+/* Should rules have a default precedence? */
+bool default_prec = true;
\f
-/*-------------------------------------------------------------------.
-| Copy the contents of a `%{ ... %}' into the definitions file. The |
-| `%{' has already been read. Return after reading the `%}'. |
-`-------------------------------------------------------------------*/
-
-static void
-copy_definition (struct obstack *oout)
-{
- int c;
- /* -1 while reading a character if prev char was %. */
- int after_percent;
-
- if (!no_lines_flag)
- {
- obstack_fgrow2 (oout, muscle_find ("linef"),
- lineno, quotearg_style (c_quoting_style,
- muscle_find ("filename")));
- }
-
- after_percent = 0;
-
- c = getc (finput);
-
- for (;;)
- {
- switch (c)
- {
- case '\n':
- obstack_1grow (oout, c);
- ++lineno;
- break;
-
- case '%':
- after_percent = -1;
- break;
-
- case '\'':
- case '"':
- copy_string (finput, oout, c);
- break;
-
- case '/':
- copy_comment (finput, oout);
- break;
-
- case EOF:
- fatal ("%s", _("unterminated `%{' definition"));
-
- default:
- copy_character (oout, c);
- }
-
- c = getc (finput);
-
- if (after_percent)
- {
- if (c == '}')
- return;
- obstack_1grow (oout, '%');
- }
- after_percent = 0;
- }
-}
-
-
-/*------------------------------------------.
-| Parse what comes after %token or %nterm. |
-`------------------------------------------*/
-
-static void
-parse_token_decl (symbol_class class)
-{
- token_t token = tok_undef;
- char *typename = NULL;
-
- /* The symbol being defined. */
- symbol_t *symbol = NULL;
-
- /* After `%token' and `%nterm', any number of symbols maybe be
- defined. */
- for (;;)
- {
- int tmp_char = ungetc (skip_white_space (), finput);
-
- /* `%' (for instance from `%token', or from `%%' etc.) is the
- only valid means to end this declaration. */
- if (tmp_char == '%')
- return;
- if (tmp_char == EOF)
- fatal (_("Premature EOF after %s"), token_buffer);
-
- token = lex ();
- switch (token)
- {
- case tok_comma:
- symbol = NULL;
- break;
-
- case tok_typename:
- typename = xstrdup (token_buffer);
- symbol = NULL;
- break;
-
- case tok_identifier:
- if (*symval->tag == '\"' && symbol)
- {
- symbol_make_alias (symbol, symval, typename);
- symbol = NULL;
- }
- else
- {
- symbol = symval;
- symbol_class_set (symbol, class);
- if (typename)
- symbol_type_set (symbol, typename);
- }
- break;
-
- case tok_number:
- symbol_user_token_number_set (symbol, numval);
- break;
-
- default:
- complain (_("`%s' is invalid in %s"),
- token_buffer,
- (class == token_sym) ? "%token" : "%nterm");
- skip_to_char ('%');
- }
- }
+/*-----------------------.
+| Set the start symbol. |
+`-----------------------*/
-}
-
-
-/*------------------------------.
-| Parse what comes after %start |
-`------------------------------*/
-
-static void
-parse_start_decl (void)
+void
+grammar_start_symbol_set (symbol *sym, location loc)
{
if (start_flag)
- complain (_("multiple %s declarations"), "%start");
- if (lex () != tok_identifier)
- complain (_("invalid %s declaration"), "%start");
+ complain_at (loc, _("multiple %s declarations"), "%start");
else
{
- start_flag = 1;
- startsymbol = symval;
- }
-}
-
-/*-----------------------------------------------------------.
-| read in a %type declaration and record its information for |
-| get_type_name to access |
-`-----------------------------------------------------------*/
-
-static void
-parse_type_decl (void)
-{
- char *name;
-
- if (lex () != tok_typename)
- {
- complain ("%s", _("%type declaration has no <typename>"));
- skip_to_char ('%');
- return;
- }
-
- name = xstrdup (token_buffer);
-
- for (;;)
- {
- token_t t;
- int tmp_char = ungetc (skip_white_space (), finput);
-
- if (tmp_char == '%')
- return;
- if (tmp_char == EOF)
- fatal (_("Premature EOF after %s"), token_buffer);
-
- t = lex ();
-
- switch (t)
- {
- case tok_comma:
- case tok_semicolon:
- break;
-
- case tok_identifier:
- symbol_type_set (symval, name);
- break;
-
- default:
- complain (_("invalid %%type declaration due to item: %s"),
- token_buffer);
- skip_to_char ('%');
- }
+ start_flag = true;
+ startsymbol = sym;
+ startsymbol_location = loc;
}
}
-
/*----------------------------------------------------------------.
-| Read in a %left, %right or %nonassoc declaration and record its |
-| information. |
+| There are two prologues: one before %union, one after. Augment |
+| the current one. |
`----------------------------------------------------------------*/
-static void
-parse_assoc_decl (associativity assoc)
-{
- char *name = NULL;
- int prev = 0;
-
- /* Assign a new precedence level, never 0. */
- ++lastprec;
-
- for (;;)
- {
- token_t t;
- int tmp_char = ungetc (skip_white_space (), finput);
-
- if (tmp_char == '%')
- return;
- if (tmp_char == EOF)
- fatal (_("Premature EOF after %s"), token_buffer);
-
- t = lex ();
-
- switch (t)
- {
- case tok_typename:
- name = xstrdup (token_buffer);
- break;
-
- case tok_comma:
- break;
-
- case tok_identifier:
- symbol_class_set (symval, token_sym);
- symbol_precedence_set (symval, lastprec, assoc);
- if (name)
- symbol_type_set (symval, name);
- break;
-
- case tok_number:
- if (prev == tok_identifier)
- {
- symbol_user_token_number_set (symval, numval);
- }
- else
- {
- complain
- (_("invalid text (%s) - number should be after identifier"),
- token_buffer);
- skip_to_char ('%');
- }
- break;
-
- case tok_semicolon:
- return;
-
- default:
- complain (_("unexpected item: %s"), token_buffer);
- skip_to_char ('%');
- }
-
- prev = t;
- }
-}
-
-
-
-/*--------------------------------------------------------------.
-| Copy the union declaration into the stype muscle |
-| (and fdefines), where it is made into the definition of |
-| YYSTYPE, the type of elements of the parser value stack. |
-`--------------------------------------------------------------*/
-
-static void
-parse_union_decl (void)
-{
- int c;
- int count = 0;
- bool done = FALSE;
- struct obstack union_obstack;
- if (typed)
- complain (_("multiple %s declarations"), "%union");
-
- typed = 1;
-
- MUSCLE_INSERT_INT ("stype_line", lineno);
- obstack_init (&union_obstack);
- obstack_sgrow (&union_obstack, "union");
-
- while (!done)
- {
- c = xgetc (finput);
-
- /* If C contains '/', it is output by copy_comment (). */
- if (c != '/')
- obstack_1grow (&union_obstack, c);
-
- switch (c)
- {
- case '\n':
- ++lineno;
- break;
-
- case '/':
- copy_comment (finput, &union_obstack);
- break;
-
- case '{':
- ++count;
- break;
-
- case '}':
- /* FIXME: Errr. How could this happen???. --akim */
- if (count == 0)
- complain (_("unmatched %s"), "`}'");
- count--;
- if (!count)
- done = TRUE;
- break;
- }
- }
-
- /* JF don't choke on trailing semi */
- c = skip_white_space ();
- if (c != ';')
- ungetc (c, finput);
- obstack_1grow (&union_obstack, 0);
- muscle_insert ("stype", obstack_finish (&union_obstack));
-}
-
-
-/*-------------------------------------------------------.
-| Parse the declaration %expect N which says to expect N |
-| shift-reduce conflicts. |
-`-------------------------------------------------------*/
-
-static void
-parse_expect_decl (void)
-{
- int c = skip_white_space ();
- ungetc (c, finput);
-
- if (!isdigit (c))
- complain (_("argument of %%expect is not an integer"));
- else
- expected_conflicts = read_signed_integer (finput);
-}
-
-
-static void
-parse_muscle_decl (void)
+void
+prologue_augment (const char *prologue, location loc)
{
- int ch = ungetc (skip_white_space (), finput);
- char *muscle_key;
- char *muscle_value;
-
- /* Read key. */
- if (!isalpha (ch) && ch != '_')
- {
- complain (_("invalid %s declaration"), "%define");
- skip_to_char ('%');
- return;
- }
- copy_identifier (finput, &muscle_obstack);
- obstack_1grow (&muscle_obstack, 0);
- muscle_key = obstack_finish (&muscle_obstack);
-
- /* Read value. */
- ch = skip_white_space ();
- if (ch != '"')
- {
- ungetc (ch, finput);
- if (ch != EOF)
- {
- complain (_("invalid %s declaration"), "%define");
- skip_to_char ('%');
- return;
- }
- else
- fatal (_("Premature EOF after %s"), "\"");
- }
- copy_string2 (finput, &muscle_obstack, '"', 0);
- obstack_1grow (&muscle_obstack, 0);
- muscle_value = obstack_finish (&muscle_obstack);
-
- /* Store the (key, value) pair in the environment. */
- muscle_insert (muscle_key, muscle_value);
+ struct obstack *oout =
+ !typed ? &pre_prologue_obstack : &post_prologue_obstack;
+
+ obstack_fgrow1 (oout, "]b4_syncline([[%d]], [[", loc.start.line);
+ MUSCLE_OBSTACK_SGROW (oout,
+ quotearg_style (c_quoting_style, loc.start.file));
+ obstack_sgrow (oout, "]])[\n");
+ obstack_sgrow (oout, prologue);
}
+\f
+/*-------------------------------------------------------------------.
+| Return the merger index for a merging function named NAME, whose |
+| arguments have type TYPE. Records the function, if new, in |
+| MERGER_LIST. |
+`-------------------------------------------------------------------*/
-/*---------------------------------.
-| Parse a double quoted parameter. |
-`---------------------------------*/
-
-static const char *
-parse_dquoted_param (const char *from)
+static int
+get_merge_function (uniqstr name, uniqstr type, location loc)
{
- struct obstack param_obstack;
- const char *param = NULL;
- int c;
-
- obstack_init (¶m_obstack);
- c = skip_white_space ();
-
- if (c != '"')
- {
- complain (_("invalid %s declaration"), from);
- ungetc (c, finput);
- skip_to_char ('%');
- return NULL;
- }
-
- while ((c = literalchar ()) != '"')
- obstack_1grow (¶m_obstack, c);
+ merger_list *syms;
+ merger_list head;
+ int n;
- obstack_1grow (¶m_obstack, '\0');
- param = obstack_finish (¶m_obstack);
+ if (! glr_parser)
+ return 0;
- if (c != '"' || strlen (param) == 0)
- {
- complain (_("invalid %s declaration"), from);
- if (c != '"')
- ungetc (c, finput);
- skip_to_char ('%');
- return NULL;
- }
-
- return param;
-}
-
-/*----------------------------------.
-| Parse what comes after %skeleton. |
-`----------------------------------*/
+ if (type == NULL)
+ type = uniqstr_new ("");
-static void
-parse_skel_decl (void)
-{
- skeleton = parse_dquoted_param ("%skeleton");
+ head.next = merge_functions;
+ for (syms = &head, n = 1; syms->next != NULL; syms = syms->next, n += 1)
+ if (UNIQSTR_EQ (name, syms->next->name))
+ break;
+ if (syms->next == NULL)
+ {
+ syms->next = xmalloc (sizeof syms->next[0]);
+ syms->next->name = uniqstr_new (name);
+ syms->next->type = uniqstr_new (type);
+ syms->next->next = NULL;
+ merge_functions = head.next;
+ }
+ else if (!UNIQSTR_EQ (type, syms->next->type))
+ warn_at (loc, _("result type clash on merge function %s: <%s> != <%s>"),
+ name, type, syms->next->type);
+ return n;
}
-/*----------------------------------------------------------------.
-| Read from finput until `%%' is seen. Discard the `%%'. Handle |
-| any `%' declarations, and copy the contents of any `%{ ... %}' |
-| groups to PRE_PROLOGUE_OBSTACK or POST_PROLOGUE_OBSTACK. |
-`----------------------------------------------------------------*/
-
-static void
-read_declarations (void)
-{
- for (;;)
- {
- int c = skip_white_space ();
-
- if (c == '%')
- {
- token_t tok = parse_percent_token ();
-
- switch (tok)
- {
- case tok_two_percents:
- return;
-
- case tok_percent_left_curly:
- if (!typed)
- copy_definition (&pre_prologue_obstack);
- else
- copy_definition (&post_prologue_obstack);
- break;
-
- case tok_token:
- parse_token_decl (token_sym);
- break;
-
- case tok_nterm:
- parse_token_decl (nterm_sym);
- break;
-
- case tok_type:
- parse_type_decl ();
- break;
-
- case tok_start:
- parse_start_decl ();
- break;
-
- case tok_union:
- parse_union_decl ();
- break;
-
- case tok_expect:
- parse_expect_decl ();
- break;
-
- case tok_left:
- parse_assoc_decl (left_assoc);
- break;
-
- case tok_right:
- parse_assoc_decl (right_assoc);
- break;
-
- case tok_nonassoc:
- parse_assoc_decl (non_assoc);
- break;
-
- case tok_define:
- parse_muscle_decl ();
- break;
-
- case tok_skel:
- parse_skel_decl ();
- break;
-
- case tok_noop:
- break;
-
- case tok_stropt:
- case tok_intopt:
- case tok_obsolete:
- assert (0);
- break;
-
- case tok_illegal:
- default:
- complain (_("unrecognized: %s"), token_buffer);
- skip_to_char ('%');
- }
- }
- else if (c == EOF)
- fatal (_("no input grammar"));
- else
- {
- char buf[] = "c";
- buf[0] = c;
- complain (_("unknown character: %s"), quote (buf));
- skip_to_char ('%');
- }
- }
-}
-\f
-/*------------------------------------------------------------------.
-| Assuming that a `{' has just been seen, copy everything up to the |
-| matching `}' into ACTION_OBSTACK. |
-| |
-| RULE_LENGTH is the number of values in the current rule so far, |
-| which says where to find `$0' with respect to the top of the |
-| stack. It is not the same as the rule->length in the case of mid |
-| rule actions. |
-| |
-| This routine is used for actions. |
-`------------------------------------------------------------------*/
+/*--------------------------------------.
+| Free all merge-function definitions. |
+`--------------------------------------*/
-static void
-parse_action (symbol_list *rule, int rule_length)
+void
+free_merger_functions (void)
{
- int count = 1;
- rule->action_line = lineno;
- while (count > 0)
+ merger_list *L0;
+ if (! glr_parser)
+ return;
+ L0 = merge_functions;
+ while (L0 != NULL)
{
- int c;
- while ((c = getc (finput)) != '}')
- switch (c)
- {
- case '\n':
- copy_character (&action_obstack, c);
- ++lineno;
- break;
-
- case '{':
- copy_character (&action_obstack, c);
- ++count;
- break;
-
- case '\'':
- case '"':
- copy_string (finput, &action_obstack, c);
- break;
-
- case '/':
- copy_comment (finput, &action_obstack);
- break;
-
- case '$':
- copy_dollar (finput, &action_obstack, rule, rule_length);
- break;
-
- case '@':
- copy_at (finput, &action_obstack, rule_length);
- break;
-
- case EOF:
- fatal (_("unmatched %s"), "`{'");
-
- default:
- copy_character (&action_obstack, c);
- }
-
- /* Above loop exits when C is '}'. */
- if (--count)
- copy_character (&action_obstack, c);
+ merger_list *L1 = L0->next;
+ free (L0);
+ L0 = L1;
}
-
- obstack_1grow (&action_obstack, '\0');
- rule->action = obstack_finish (&action_obstack);
}
-\f
-
-/*-------------------------------------------------------------------.
-| Generate a dummy symbol, a nonterminal, whose name cannot conflict |
-| with the user's names. |
-`-------------------------------------------------------------------*/
-
-static symbol_t *
-gensym (void)
-{
- /* Incremented for each generated symbol */
- static int gensym_count = 0;
- static char buf[256];
-
- symbol_t *sym;
-
- sprintf (buf, "@%d", ++gensym_count);
- token_buffer = buf;
- sym = getsym (token_buffer);
- sym->class = nterm_sym;
- sym->number = nvars++;
- return sym;
-}
\f
/*-------------------------------------------------------------------.
| Parse the input grammar into a one symbol_list structure. Each |
/* The (currently) last symbol of GRAMMAR. */
symbol_list *grammar_end = NULL;
-/* Append S to the GRAMMAR. */
-static void
-grammar_symbol_append (symbol_t *s)
+/* Append SYM to the grammar. */
+void
+grammar_symbol_append (symbol *sym, location loc)
{
- symbol_list *p = symbol_list_new (s);
+ symbol_list *p = symbol_list_new (sym, loc);
if (grammar_end)
grammar_end->next = p;
grammar_end = p;
}
-/* The rule currently being defined, and the previous rule. Point to
- the first symbol of each list: their lhs. */
+/* The rule currently being defined, and the previous rule.
+ CURRENT_RULE points to the first LHS of the current rule, while
+ PREVIOUS_RULE_END points to the *end* of the previous rule (NULL). */
symbol_list *current_rule = NULL;
-symbol_list *previous_rule = NULL;
+symbol_list *previous_rule_end = NULL;
-/* Create a new rule for LHS in to the GRAMMAR. */
+/*----------------------------------------------.
+| Create a new rule for LHS in to the GRAMMAR. |
+`----------------------------------------------*/
-static void
-grammar_rule_begin (symbol_t *lhs)
+void
+grammar_rule_begin (symbol *lhs, location loc)
{
if (!start_flag)
{
startsymbol = lhs;
- start_flag = 1;
+ startsymbol_location = loc;
+ start_flag = true;
}
/* Start a new rule and record its lhs. */
++nrules;
++nritems;
- previous_rule = grammar_end;
- grammar_symbol_append (lhs);
+ previous_rule_end = grammar_end;
+ grammar_symbol_append (lhs, loc);
current_rule = grammar_end;
/* Mark the rule's lhs as a nonterminal if not already so. */
++nvars;
}
else if (lhs->class == token_sym)
- complain (_("rule given for %s, which is a token"), lhs->tag);
+ complain_at (loc, _("rule given for %s, which is a token"), lhs->tag);
}
+/* Check that the last rule (CURRENT_RULE) is properly defined. For
+ instance, there should be no type clash on the default action. */
+
static void
-readgram (void)
+grammar_current_rule_check (void)
{
- token_t t;
- symbol_t *lhs = NULL;
-
- t = lex ();
-
- while (t != tok_two_percents && t != tok_eof)
- if (t == tok_identifier || t == tok_bar)
- {
- int action_flag = 0;
- /* Number of symbols in rhs of this rule so far */
- int rulelength = 0;
- int xactions = 0; /* JF for error checking */
- symbol_t *first_rhs = 0;
-
- if (t == tok_identifier)
- {
- lhs = symval;
-
- t = lex ();
- if (t != tok_colon)
- {
- complain (_("ill-formed rule: initial symbol not followed by colon"));
- unlex (t);
- }
- }
- if (nrules == 0 && t == tok_bar)
- {
- complain (_("grammar starts with vertical bar"));
- lhs = symval; /* BOGUS: use a random symval */
- }
-
- grammar_rule_begin (lhs);
- /* read the rhs of the rule. */
-
- for (;;)
- {
- t = lex ();
- if (t == tok_prec)
- {
- t = lex ();
- current_rule->ruleprec = symval;
- t = lex ();
- }
-
- if (!(t == tok_identifier || t == tok_left_curly))
- break;
-
- /* If next token is an identifier, see if a colon follows it.
- If one does, exit this rule now. */
- if (t == tok_identifier)
- {
- symbol_t *ssave;
- token_t t1;
-
- ssave = symval;
- t1 = lex ();
- unlex (t1);
- symval = ssave;
- if (t1 == tok_colon)
- {
- warn (_("previous rule lacks an ending `;'"));
- break;
- }
-
- if (!first_rhs) /* JF */
- first_rhs = symval;
- /* Not followed by colon =>
- process as part of this rule's rhs. */
- }
-
- /* If we just passed an action, that action was in the middle
- of a rule, so make a dummy rule to reduce it to a
- non-terminal. */
- if (action_flag)
- {
- /* Since the action was written out with this rule's
- number, we must give the new rule this number by
- inserting the new rule before it. */
-
- /* Make a dummy nonterminal, a gensym. */
- symbol_t *sdummy = gensym ();
- symbol_list *p = symbol_list_new (sdummy);
-
- /* Make a new rule, whose body is empty, before the
- current one, so that the action just read can
- belong to it. */
- ++nrules;
- ++nritems;
- /* Attach its lineno to that of the host rule. */
- p->line = current_rule->line;
- /* Move the action from the host rule to this one. */
- p->action = current_rule->action;
- p->action_line = current_rule->action_line;
- current_rule->action = NULL;
-
- if (previous_rule)
- previous_rule->next = p;
- else
- grammar = p;
- /* End of the rule. */
- previous_rule = symbol_list_new (NULL);
- previous_rule->next = current_rule;
-
- p->next = previous_rule;
-
- /* Insert the dummy generated by that rule into this
- rule. */
- ++nritems;
- grammar_symbol_append (sdummy);
- action_flag = 0;
- }
-
- if (t == tok_identifier)
- {
- ++nritems;
- grammar_symbol_append (symval);
- }
- else /* handle an action. */
- {
- parse_action (current_rule, rulelength);
- action_flag = 1;
- ++xactions; /* JF */
- }
- ++rulelength;
- } /* end of read rhs of rule */
-
- /* Put an empty link in the list to mark the end of this rule */
- grammar_symbol_append (NULL);
-
- if (t == tok_prec)
- {
- complain (_("two @prec's in a row"));
- t = lex ();
- current_rule->ruleprec = symval;
- t = lex ();
- }
-
- if (t == tok_left_curly)
- {
- /* This case never occurs -wjh */
- if (action_flag)
- complain (_("two actions at end of one rule"));
- parse_action (current_rule, rulelength);
- action_flag = 1;
- ++xactions; /* -wjh */
- t = lex ();
- }
- /* If $$ is being set in default way, report if any type
- mismatch. */
- else if (!xactions
- && first_rhs && lhs->type_name != first_rhs->type_name)
- {
- if (lhs->type_name == 0
- || first_rhs->type_name == 0
- || strcmp (lhs->type_name, first_rhs->type_name))
- complain (_("type clash (`%s' `%s') on default action"),
- lhs->type_name ? lhs->type_name : "",
- first_rhs->type_name ? first_rhs->type_name : "");
- }
- /* Warn if there is no default for $$ but we need one. */
- else if (!xactions && !first_rhs && lhs->type_name != 0)
- complain (_("empty rule for typed nonterminal, and no action"));
- if (t == tok_two_percents || t == tok_eof)
- warn (_("previous rule lacks an ending `;'"));
- if (t == tok_semicolon)
- t = lex ();
- }
- else
- {
- complain (_("invalid input: %s"), quote (token_buffer));
- t = lex ();
- }
-
- /* grammar has been read. Do some checking */
+ symbol *lhs = current_rule->sym;
+ char const *lhs_type = lhs->type_name;
+ symbol *first_rhs = current_rule->next->sym;
+
+ /* If there is an action, then there is nothing we can do: the user
+ is allowed to shoot herself in the foot. */
+ if (current_rule->action)
+ return;
+
+ /* Don't worry about the default action if $$ is untyped, since $$'s
+ value can't be used. */
+ if (! lhs_type)
+ return;
+
+ /* If $$ is being set in default way, report if any type mismatch. */
+ if (first_rhs)
+ {
+ const char *rhs_type = first_rhs->type_name ? first_rhs->type_name : "";
+ if (!UNIQSTR_EQ (lhs_type, rhs_type))
+ warn_at (current_rule->location,
+ _("type clash on default action: <%s> != <%s>"),
+ lhs_type, rhs_type);
+ }
+ /* Warn if there is no default for $$ but we need one. */
+ else
+ warn_at (current_rule->location,
+ _("empty rule for typed nonterminal, and no action"));
+}
- if (nrules == 0)
- fatal (_("no rules in the input grammar"));
- /* Report any undefined symbols and consider them nonterminals. */
- symbols_check_defined ();
+/*-------------------------------------.
+| End the currently being grown rule. |
+`-------------------------------------*/
- /* Insert the initial rule, which line is that of the first rule
- (not that of the start symbol):
+void
+grammar_rule_end (location loc)
+{
+ /* Put an empty link in the list to mark the end of this rule */
+ grammar_symbol_append (NULL, grammar_end->location);
+ current_rule->location = loc;
+ grammar_current_rule_check ();
+}
- axiom: %start EOF. */
- {
- symbol_list *p = symbol_list_new (axiom);
- p->line = grammar->line;
- p->next = symbol_list_new (startsymbol);
- p->next->next = symbol_list_new (eoftoken);
- p->next->next->next = symbol_list_new (NULL);
- p->next->next->next->next = grammar;
- nrules += 1;
- nritems += 3;
- grammar = p;
- }
- if (nsyms > SHRT_MAX)
- fatal (_("too many symbols (tokens plus nonterminals); maximum %d"),
- SHRT_MAX);
+/*-------------------------------------------------------------------.
+| The previous action turns out the be a mid-rule action. Attach it |
+| to the current rule, i.e., create a dummy symbol, attach it this |
+| mid-rule action, and append this dummy nonterminal to the current |
+| rule. |
+`-------------------------------------------------------------------*/
+
+void
+grammar_midrule_action (void)
+{
+ /* Since the action was written out with this rule's number, we must
+ give the new rule this number by inserting the new rule before
+ it. */
+
+ /* Make a DUMMY nonterminal, whose location is that of the midrule
+ action. Create the MIDRULE. */
+ location dummy_location = current_rule->action_location;
+ symbol *dummy = dummy_symbol_get (dummy_location);
+ symbol_list *midrule = symbol_list_new (dummy, dummy_location);
+
+ /* Make a new rule, whose body is empty, before the current one, so
+ that the action just read can belong to it. */
+ ++nrules;
+ ++nritems;
+ /* Attach its location and actions to that of the DUMMY. */
+ midrule->location = dummy_location;
+ midrule->action = current_rule->action;
+ midrule->action_location = dummy_location;
+ current_rule->action = NULL;
+
+ if (previous_rule_end)
+ previous_rule_end->next = midrule;
+ else
+ grammar = midrule;
+
+ /* End the dummy's rule. */
+ previous_rule_end = symbol_list_new (NULL, dummy_location);
+ previous_rule_end->next = current_rule;
+
+ midrule->next = previous_rule_end;
- assert (nsyms == ntokens + nvars);
+ /* Insert the dummy nonterminal replacing the midrule action into
+ the current rule. */
+ grammar_current_rule_symbol_append (dummy, dummy_location);
}
-/* At the end of the grammar file, some C source code must
- be stored. It is going to be associated to the epilogue
- directive. */
-static void
-read_additionnal_code (void)
+/* Set the precedence symbol of the current rule to PRECSYM. */
+
+void
+grammar_current_rule_prec_set (symbol *precsym, location loc)
{
- int c;
- struct obstack el_obstack;
+ if (current_rule->ruleprec)
+ complain_at (loc, _("only one %s allowed per rule"), "%prec");
+ current_rule->ruleprec = precsym;
+}
- obstack_init (&el_obstack);
+/* Attach dynamic precedence DPREC to the current rule. */
- if (!no_lines_flag)
- {
- obstack_fgrow2 (&el_obstack, muscle_find ("linef"),
- lineno, quotearg_style (c_quoting_style,
- muscle_find ("filename")));
- }
+void
+grammar_current_rule_dprec_set (int dprec, location loc)
+{
+ if (! glr_parser)
+ warn_at (loc, _("%s affects only GLR parsers"), "%dprec");
+ if (dprec <= 0)
+ complain_at (loc, _("%s must be followed by positive number"), "%dprec");
+ else if (current_rule->dprec != 0)
+ complain_at (loc, _("only one %s allowed per rule"), "%dprec");
+ current_rule->dprec = dprec;
+}
+
+/* Attach a merge function NAME with argument type TYPE to current
+ rule. */
+
+void
+grammar_current_rule_merge_set (uniqstr name, location loc)
+{
+ if (! glr_parser)
+ warn_at (loc, _("%s affects only GLR parsers"), "%merge");
+ if (current_rule->merger != 0)
+ complain_at (loc, _("only one %s allowed per rule"), "%merge");
+ current_rule->merger =
+ get_merge_function (name, current_rule->sym->type_name, loc);
+}
+
+/* Attach SYM to the current rule. If needed, move the previous
+ action as a mid-rule action. */
+
+void
+grammar_current_rule_symbol_append (symbol *sym, location loc)
+{
+ if (current_rule->action)
+ grammar_midrule_action ();
+ ++nritems;
+ grammar_symbol_append (sym, loc);
+}
- while ((c = getc (finput)) != EOF)
- copy_character (&el_obstack, c);
+/* Attach an ACTION to the current rule. If needed, move the previous
+ action as a mid-rule action. */
- obstack_1grow (&el_obstack, 0);
- muscle_insert ("epilogue", obstack_finish (&el_obstack));
+void
+grammar_current_rule_action_append (const char *action, location loc)
+{
+ if (current_rule->action)
+ grammar_midrule_action ();
+ current_rule->action = action;
+ current_rule->action_location = loc;
}
\f
static void
packgram (void)
{
- unsigned int itemno;
- int ruleno;
- symbol_list *p;
-
- ritem = XCALLOC (item_number_t, nritems);
- rules = XCALLOC (rule_t, nrules) - 1;
+ unsigned int itemno = 0;
+ rule_number ruleno = 0;
+ symbol_list *p = grammar;
- itemno = 0;
- ruleno = 1;
+ ritem = xnmalloc (nritems, sizeof *ritem);
+ rules = xnmalloc (nrules, sizeof *rules);
- p = grammar;
while (p)
{
- symbol_t *ruleprec = p->ruleprec;
+ symbol *ruleprec = p->ruleprec;
rules[ruleno].user_number = ruleno;
rules[ruleno].number = ruleno;
rules[ruleno].lhs = p->sym;
rules[ruleno].rhs = ritem + itemno;
- rules[ruleno].line = p->line;
- rules[ruleno].useful = TRUE;
+ rules[ruleno].prec = NULL;
+ rules[ruleno].dprec = p->dprec;
+ rules[ruleno].merger = p->merger;
+ rules[ruleno].precsym = NULL;
+ rules[ruleno].location = p->location;
+ rules[ruleno].useful = true;
rules[ruleno].action = p->action;
- rules[ruleno].action_line = p->action_line;
+ rules[ruleno].action_location = p->action_location;
p = p->next;
while (p && p->sym)
{
- /* item_number_t = symbol_number_t.
+ /* item_number = symbol_number.
But the former needs to contain more: negative rule numbers. */
ritem[itemno++] = symbol_number_as_item_number (p->sym->number);
/* A rule gets by default the precedence and associativity
of the last token in it. */
- if (p->sym->class == token_sym)
+ if (p->sym->class == token_sym && default_prec)
rules[ruleno].prec = p->sym;
if (p)
p = p->next;
rules[ruleno].precsym = ruleprec;
rules[ruleno].prec = ruleprec;
}
- ritem[itemno++] = -ruleno;
+ ritem[itemno++] = rule_number_as_item_number (ruleno);
++ruleno;
if (p)
p = p->next;
}
- assert (itemno == nritems);
+ if (itemno != nritems)
+ abort ();
- if (trace_flag)
+ if (trace_flag & trace_sets)
ritem_print (stderr);
}
\f
void
reader (void)
{
- lex_init ();
- lineno = 1;
-
- /* Initialize the muscle obstack. */
- obstack_init (&muscle_obstack);
-
/* Initialize the symbol table. */
symbols_new ();
- /* Construct the axiom symbol. */
- axiom = getsym ("$axiom");
- axiom->class = nterm_sym;
- axiom->number = nvars++;
+ /* Construct the accept symbol. */
+ accept = symbol_get ("$accept", empty_location);
+ accept->class = nterm_sym;
+ accept->number = nvars++;
/* Construct the error token */
- errtoken = getsym ("error");
+ errtoken = symbol_get ("error", empty_location);
errtoken->class = token_sym;
errtoken->number = ntokens++;
/* Construct a token that represents all undefined literal tokens.
It is always token number 2. */
- undeftoken = getsym ("$undefined.");
+ undeftoken = symbol_get ("$undefined", empty_location);
undeftoken->class = token_sym;
undeftoken->number = ntokens++;
/* Initialize the obstacks. */
- obstack_init (&action_obstack);
- obstack_init (&output_obstack);
obstack_init (&pre_prologue_obstack);
obstack_init (&post_prologue_obstack);
- finput = xfopen (infile, "r");
+ finput = xfopen (grammar_file, "r");
+ gram_in = finput;
+
+ gram__flex_debug = trace_flag & trace_scan;
+ gram_debug = trace_flag & trace_parse;
+ scanner_initialize ();
+ gram_parse ();
+
+ /* If something went wrong during the parsing, don't try to
+ continue. */
+ if (complaint_issued)
+ return;
+
+ /* Grammar has been read. Do some checking */
+ if (nrules == 0)
+ fatal (_("no rules in the input grammar"));
- /* Read the declaration section. Copy %{ ... %} groups to
- TABLE_OBSTACK and FDEFINES file. Also notice any %token, %left,
- etc. found there. */
- read_declarations ();
+ /* Report any undefined symbols and consider them nonterminals. */
+ symbols_check_defined ();
- /* If the user did not define her EOFTOKEN, do it now. */
- if (!eoftoken)
+ /* If the user did not define her ENDTOKEN, do it now. */
+ if (!endtoken)
{
- eoftoken = getsym ("$");
- eoftoken->class = token_sym;
- eoftoken->number = 0;
+ endtoken = symbol_get ("$end", empty_location);
+ endtoken->class = token_sym;
+ endtoken->number = 0;
/* Value specified by POSIX. */
- eoftoken->user_token_number = 0;
+ endtoken->user_token_number = 0;
}
- /* Read in the grammar, build grammar in list form. Write out
- actions. */
- readgram ();
- /* Some C code is given at the end of the grammar file. */
- read_additionnal_code ();
+ /* Insert the initial rule, which line is that of the first rule
+ (not that of the start symbol):
+
+ accept: %start EOF. */
+ {
+ symbol_list *p = symbol_list_new (accept, empty_location);
+ p->location = grammar->location;
+ p->next = symbol_list_new (startsymbol, empty_location);
+ p->next->next = symbol_list_new (endtoken, empty_location);
+ p->next->next->next = symbol_list_new (NULL, empty_location);
+ p->next->next->next->next = grammar;
+ nrules += 1;
+ nritems += 3;
+ grammar = p;
+ }
+
+ if (! (nsyms <= SYMBOL_NUMBER_MAXIMUM && nsyms == ntokens + nvars))
+ abort ();
- lex_free ();
xfclose (finput);
/* Assign the symbols their symbol numbers. Write #defines for the
projects / bison.git / blobdiff