/* Input parser for bison
- Copyright 1984, 1986, 1989, 1992, 1998, 2000
+ Copyright (C) 1984, 1986, 1989, 1992, 1998, 2000, 2001, 2002
Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include "system.h"
-#include "obstack.h"
#include "quotearg.h"
#include "quote.h"
#include "getargs.h"
#include "files.h"
-#include "xalloc.h"
#include "symtab.h"
-#include "lex.h"
+#include "options.h"
#include "gram.h"
#include "complain.h"
#include "output.h"
#include "reader.h"
#include "conflicts.h"
-
-/* Number of slots allocated (but not necessarily used yet) in `rline' */
-static int rline_allocated;
-
-typedef struct symbol_list
-{
- struct symbol_list *next;
- bucket *sym;
- bucket *ruleprec;
-}
-symbol_list;
+#include "muscle_tab.h"
int lineno;
-char **tags;
-short *user_toknums;
-static symbol_list *grammar;
-static int start_flag;
-static bucket *startval;
-
-/* Nonzero if components of semantic values are used, implying
- they must be unions. */
-static int value_components_used;
+static symbol_list *grammar = NULL;
+static int start_flag = 0;
/* Nonzero if %union has been seen. */
-static int typed;
-
-/* Incremented for each %left, %right or %nonassoc seen */
-static int lastprec;
+int typed = 0;
-/* Incremented for each generated symbol */
-static int gensym_count;
-
-static bucket *errtoken;
-static bucket *undeftoken;
-\f
-
-/*===================\
-| Low level lexing. |
-\===================*/
-
-static void
-skip_to_char (int target)
+static symbol_list *
+symbol_list_new (symbol_t *sym)
{
- 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);
+ 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;
}
-
-/*---------------------------------------------------------.
-| 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)
+char *
+get_type_name (int n, symbol_list *rule)
{
int i;
symbol_list *rp;
complain (_("invalid $ value"));
return NULL;
}
- i++;
+ ++i;
}
return rp->sym->type_name;
}
-\f
-/*------------------------------------------------------------.
-| Dump the string from FIN to OOUT if non null. MATCH is the |
-| delimiter of the string (either ' or "). |
-`------------------------------------------------------------*/
-static inline void
-copy_string (FILE *fin, struct obstack *oout, int match)
-{
- int c;
- obstack_1grow (oout, match);
+/*-----------------------.
+| Set the start symbol. |
+`-----------------------*/
- c = getc (fin);
-
- while (c != match)
+void
+grammar_start_symbol_set (symbol_t *s)
+{
+ if (start_flag)
+ complain (_("multiple %s declarations"), "%start");
+ else
{
- if (c == EOF)
- fatal (_("unterminated string at end of file"));
- if (c == '\n')
- {
- complain (_("unterminated string"));
- ungetc (c, fin);
- c = match; /* invent terminator */
- continue;
- }
-
- obstack_1grow (oout, c);
-
- if (c == '\\')
- {
- c = getc (fin);
- if (c == EOF)
- fatal (_("unterminated string at end of file"));
- obstack_1grow (oout, c);
-
- if (c == '\n')
- lineno++;
- }
-
- c = getc (fin);
+ start_flag = 1;
+ startsymbol = s;
}
-
- obstack_1grow (oout, c);
}
-/*-----------------------------------------------------------------.
-| Dump the wannabee comment from IN to OUT1 and OUT2 (which can be |
-| NULL). In fact we just saw a `/', which might or might not be a |
-| comment. In any case, copy what we saw. |
-| |
-| OUT2 might be NULL. |
-`-----------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| There are two prologues: one before %union, one after. Augment |
+| the current one. |
+`----------------------------------------------------------------*/
-static inline void
-copy_comment2 (FILE *fin, struct obstack *oout1, struct obstack *oout2)
+void
+prologue_augment (const char *prologue, int location)
{
- int cplus_comment;
- int ended;
- int c;
-
- /* We read a `/', output it. */
- obstack_1grow (oout1, '/');
- if (oout2)
- obstack_1grow (oout2, '/');
+ struct obstack *oout =
+ !typed ? &pre_prologue_obstack : &post_prologue_obstack;
- switch ((c = getc (fin)))
- {
- case '/':
- cplus_comment = 1;
- break;
- case '*':
- cplus_comment = 0;
- break;
- default:
- ungetc (c, fin);
- return;
- }
-
- obstack_1grow (oout1, c);
- if (oout2)
- obstack_1grow (oout2, c);
- c = getc (fin);
-
- ended = 0;
- while (!ended)
+ if (!no_lines_flag)
{
- if (!cplus_comment && c == '*')
- {
- while (c == '*')
- {
- obstack_1grow (oout1, c);
- if (oout2)
- obstack_1grow (oout2, c);
- c = getc (fin);
- }
-
- if (c == '/')
- {
- obstack_1grow (oout1, c);
- if (oout2)
- obstack_1grow (oout2, c);
- ended = 1;
- }
- }
- else if (c == '\n')
- {
- lineno++;
- obstack_1grow (oout1, c);
- if (oout2)
- obstack_1grow (oout2, c);
- if (cplus_comment)
- ended = 1;
- else
- c = getc (fin);
- }
- else if (c == EOF)
- fatal (_("unterminated comment"));
- else
- {
- obstack_1grow (oout1, c);
- if (oout2)
- obstack_1grow (oout2, c);
- c = getc (fin);
- }
+ obstack_fgrow2 (oout, muscle_find ("linef"),
+ location, quotearg_style (c_quoting_style,
+ muscle_find ("filename")));
}
+ obstack_sgrow (oout, prologue);
}
-/*-------------------------------------------------------------------.
-| Dump the comment (actually the current string starting with a `/') |
-| from FIN to OOUT. |
-`-------------------------------------------------------------------*/
-
-static inline void
-copy_comment (FILE *fin, struct obstack *oout)
-{
- copy_comment2 (fin, oout, NULL);
-}
-/*-----------------------------------------------------------------.
-| FIN is pointing to a location (i.e., a `@'). Output to OOUT a |
-| reference to this location. STACK_OFFSET is the number of values |
-| in the current rule so far, which says where to find `$0' with |
-| respect to the top of the stack. |
-`-----------------------------------------------------------------*/
+/*----------------------.
+| Handle the epilogue. |
+`----------------------*/
-static inline void
-copy_at (FILE *fin, struct obstack *oout, int stack_offset)
+void
+epilogue_set (const char *epilogue, int location)
{
- int c;
+ struct obstack el_obstack;
+ obstack_init (&el_obstack);
- c = getc (fin);
- if (c == '$')
- {
- obstack_sgrow (oout, "yyloc");
- locations_flag = 1;
- }
- else if (isdigit (c) || c == '-')
- {
- int n;
- char buf[4096];
-
- ungetc (c, fin);
- n = read_signed_integer (fin);
-
- obstack_fgrow1 (oout, "yylsp[%d]", n - stack_offset);
- locations_flag = 1;
- }
- else
+ if (!no_lines_flag)
{
- char buf[] = "@c";
- buf[1] = c;
- complain (_("%s is invalid"), quote (buf));
+ obstack_fgrow2 (&el_obstack, muscle_find ("linef"),
+ location, quotearg_style (c_quoting_style,
+ muscle_find ("filename")));
}
+ obstack_sgrow (&el_obstack, epilogue);
+ obstack_1grow (&el_obstack, 0);
+ muscle_insert ("epilogue", obstack_finish (&el_obstack));
}
+\f
+
/*-------------------------------------------------------------------.
-| FIN is pointing to a wannabee semantic value (i.e., a `$'). |
-| |
-| Possible inputs: $[<TYPENAME>]($|integer) |
-| |
-| Output to OOUT a reference to this semantic value. STACK_OFFSET is |
-| the number of values in the current rule so far, which says where |
-| to find `$0' with respect to the top of the stack. |
+| Generate a dummy symbol, a nonterminal, whose name cannot conflict |
+| with the user's names. |
`-------------------------------------------------------------------*/
-static inline void
-copy_dollar (FILE *fin, struct obstack *oout,
- symbol_list *rule, int stack_offset)
+static symbol_t *
+gensym (void)
{
- int c = getc (fin);
- char *type_name = NULL;
-
- /* Get the type name if explicit. */
- if (c == '<')
- {
- read_type_name (fin);
- type_name = token_buffer;
- value_components_used = 1;
- c = getc (fin);
- }
+ /* Incremented for each generated symbol */
+ static int gensym_count = 0;
+ static char buf[256];
- if (c == '$')
- {
- obstack_sgrow (oout, "yyval");
-
- if (!type_name)
- type_name = get_type_name (0, rule);
- if (type_name)
- obstack_fgrow1 (oout, ".%s", type_name);
- if (!type_name && typed)
- complain (_("$$ of `%s' has no declared type"),
- rule->sym->tag);
- }
- else if (isdigit (c) || c == '-')
- {
- int n;
- ungetc (c, fin);
- n = read_signed_integer (fin);
+ symbol_t *sym;
- if (!type_name && n > 0)
- type_name = get_type_name (n, rule);
-
- obstack_fgrow1 (oout, "yyvsp[%d]", n - stack_offset);
-
- if (type_name)
- obstack_fgrow1 (oout, ".%s", type_name);
- if (!type_name && typed)
- complain (_("$%d of `%s' has no declared type"),
- n, rule->sym->tag);
- }
- else
- {
- char buf[] = "$c";
- buf[1] = c;
- complain (_("%s is invalid"), quote (buf));
- }
+ sprintf (buf, "@%d", ++gensym_count);
+ sym = getsym (buf);
+ sym->class = nterm_sym;
+ sym->number = nvars++;
+ return sym;
}
\f
/*-------------------------------------------------------------------.
-| Copy the contents of a `%{ ... %}' into the definitions file. The |
-| `%{' has already been read. Return after reading the `%}'. |
+| Parse the input grammar into a one symbol_list structure. Each |
+| rule is represented by a sequence of symbols: the left hand side |
+| followed by the contents of the right hand side, followed by a |
+| null pointer instead of a symbol to terminate the rule. The next |
+| symbol is the lhs of the following rule. |
+| |
+| All actions are copied out, labelled by the rule number they apply |
+| to. |
+| |
+| Bison used to allow some %directives in the rules sections, but |
+| this is no longer consider appropriate: (i) the documented grammar |
+| doesn't claim it, (ii), it would promote bad style, (iii), error |
+| recovery for %directives consists in skipping the junk until a `%' |
+| is seen and helrp synchronizing. This scheme is definitely wrong |
+| in the rules section. |
`-------------------------------------------------------------------*/
-static void
-copy_definition (void)
-{
- int c;
- /* -1 while reading a character if prev char was %. */
- int after_percent;
-
- if (!no_lines_flag)
- obstack_fgrow2 (&attrs_obstack, "#line %d %s\n",
- lineno, quotearg_style (c_quoting_style, infile));
-
- after_percent = 0;
-
- c = getc (finput);
-
- for (;;)
- {
- switch (c)
- {
- case '\n':
- obstack_1grow (&attrs_obstack, c);
- lineno++;
- break;
-
- case '%':
- after_percent = -1;
- break;
-
- case '\'':
- case '"':
- copy_string (finput, &attrs_obstack, c);
- break;
-
- case '/':
- copy_comment (finput, &attrs_obstack);
- break;
-
- case EOF:
- fatal ("%s", _("unterminated `%{' definition"));
-
- default:
- obstack_1grow (&attrs_obstack, c);
- }
-
- c = getc (finput);
-
- if (after_percent)
- {
- if (c == '}')
- return;
- obstack_1grow (&attrs_obstack, '%');
- }
- after_percent = 0;
- }
-}
-
+/* The (currently) last symbol of GRAMMAR. */
+symbol_list *grammar_end = NULL;
-/*-------------------------------------------------------------------.
-| Parse what comes after %token or %nterm. For %token, WHAT_IS is |
-| token_sym and WHAT_IS_NOT is nterm_sym. For %nterm, the arguments |
-| are reversed. |
-`-------------------------------------------------------------------*/
-
-static void
-parse_token_decl (symbol_class what_is, symbol_class what_is_not)
+/* Append S to the GRAMMAR. */
+void
+grammar_symbol_append (symbol_t *s)
{
- int token = 0;
- char *typename = 0;
-
- /* The symbol being defined. */
- struct bucket *symbol = NULL;
-
- /* After `%token' and `%nterm', any number of symbols maybe be
- defined. */
- for (;;)
- {
- int tmp_char = ungetc (skip_white_space (), finput);
+ symbol_list *p = symbol_list_new (s);
- /* `%' (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 ();
- if (token == COMMA)
- {
- symbol = NULL;
- continue;
- }
- if (token == TYPENAME)
- {
- typename = xstrdup (token_buffer);
- value_components_used = 1;
- symbol = NULL;
- }
- else if (token == IDENTIFIER && *symval->tag == '\"' && symbol)
- {
- if (symval->alias)
- warn (_("symbol `%s' used more than once as a literal string"),
- symval->tag);
- else if (symbol->alias)
- warn (_("symbol `%s' given more than one literal string"),
- symbol->tag);
- else
- {
- symval->class = token_sym;
- symval->type_name = typename;
- symval->user_token_number = symbol->user_token_number;
- symbol->user_token_number = SALIAS;
- symval->alias = symbol;
- symbol->alias = symval;
- /* symbol and symval combined are only one symbol */
- nsyms--;
- }
- translations = 1;
- symbol = NULL;
- }
- else if (token == IDENTIFIER)
- {
- int oldclass = symval->class;
- symbol = symval;
-
- if (symbol->class == what_is_not)
- complain (_("symbol %s redefined"), symbol->tag);
- symbol->class = what_is;
- if (what_is == nterm_sym && oldclass != nterm_sym)
- symbol->value = nvars++;
-
- if (typename)
- {
- if (symbol->type_name == NULL)
- symbol->type_name = typename;
- else if (strcmp (typename, symbol->type_name) != 0)
- complain (_("type redeclaration for %s"), symbol->tag);
- }
- }
- else if (symbol && token == NUMBER)
- {
- symbol->user_token_number = numval;
- translations = 1;
- }
- else
- {
- complain (_("`%s' is invalid in %s"),
- token_buffer, (what_is == token_sym) ? "%token" : "%nterm");
- skip_to_char ('%');
- }
- }
-
-}
-
-
-/*------------------------------.
-| Parse what comes after %start |
-`------------------------------*/
-
-static void
-parse_start_decl (void)
-{
- if (start_flag)
- complain (_("multiple %s declarations"), "%start");
- if (lex () != IDENTIFIER)
- complain (_("invalid %s declaration"), "%start");
+ if (grammar_end)
+ grammar_end->next = p;
else
- {
- start_flag = 1;
- startval = symval;
- }
-}
+ grammar = p;
-/*-----------------------------------------------------------.
-| 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 () != TYPENAME)
- {
- complain ("%s", _("%type declaration has no <typename>"));
- skip_to_char ('%');
- return;
- }
-
- name = xstrdup (token_buffer);
-
- for (;;)
- {
- int 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 COMMA:
- case SEMICOLON:
- break;
-
- case IDENTIFIER:
- if (symval->type_name == NULL)
- symval->type_name = name;
- else if (strcmp (name, symval->type_name) != 0)
- complain (_("type redeclaration for %s"), symval->tag);
-
- break;
-
- default:
- complain (_("invalid %%type declaration due to item: %s"),
- token_buffer);
- skip_to_char ('%');
- }
- }
+ grammar_end = p;
}
+/* The rule currently being defined, and the previous rule. Point to
+ the first symbol of each list: their lhs. */
+symbol_list *current_rule = NULL;
+symbol_list *previous_rule = NULL;
-/*----------------------------------------------------------------.
-| Read in a %left, %right or %nonassoc declaration and record its |
-| information. |
-`----------------------------------------------------------------*/
+/* Create a new rule for LHS in to the GRAMMAR. */
-static void
-parse_assoc_decl (associativity assoc)
+void
+grammar_rule_begin (symbol_t *lhs)
{
- char *name = NULL;
- int prev = 0;
-
- lastprec++; /* Assign a new precedence level, never 0. */
-
- for (;;)
+ if (!start_flag)
{
- int 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 TYPENAME:
- name = xstrdup (token_buffer);
- break;
-
- case COMMA:
- break;
-
- case IDENTIFIER:
- if (symval->prec != 0)
- complain (_("redefining precedence of %s"), symval->tag);
- symval->prec = lastprec;
- symval->assoc = assoc;
- if (symval->class == nterm_sym)
- complain (_("symbol %s redefined"), symval->tag);
- symval->class = token_sym;
- if (name)
- { /* record the type, if one is specified */
- if (symval->type_name == NULL)
- symval->type_name = name;
- else if (strcmp (name, symval->type_name) != 0)
- complain (_("type redeclaration for %s"), symval->tag);
- }
- break;
-
- case NUMBER:
- if (prev == IDENTIFIER)
- {
- symval->user_token_number = numval;
- translations = 1;
- }
- else
- {
- complain (_
- ("invalid text (%s) - number should be after identifier"),
-token_buffer);
- skip_to_char ('%');
- }
- break;
-
- case SEMICOLON:
- return;
-
- default:
- complain (_("unexpected item: %s"), token_buffer);
- skip_to_char ('%');
- }
-
- prev = t;
-
+ startsymbol = lhs;
+ start_flag = 1;
}
-}
+ /* Start a new rule and record its lhs. */
+ ++nrules;
+ ++nritems;
+ previous_rule = grammar_end;
+ grammar_symbol_append (lhs);
+ current_rule = grammar_end;
-/*--------------------------------------------------------------.
-| Copy the union declaration into ATTRS_OBSTACK (and fdefines), |
-| where it is made into the definition of YYSTYPE, the type of |
-| elements of the parser value stack. |
-`--------------------------------------------------------------*/
+ /* Mark the rule's lhs as a nonterminal if not already so. */
-static void
-parse_union_decl (void)
-{
- int c;
- int count = 0;
-
- if (typed)
- complain (_("multiple %s declarations"), "%union");
-
- typed = 1;
-
- if (!no_lines_flag)
- obstack_fgrow2 (&attrs_obstack, "\n#line %d %s\n",
- lineno, quotearg_style (c_quoting_style, infile));
- else
- obstack_1grow (&attrs_obstack, '\n');
-
- obstack_sgrow (&attrs_obstack, "typedef union");
- if (defines_flag)
- obstack_sgrow (&defines_obstack, "typedef union");
-
- c = getc (finput);
-
- while (c != EOF)
+ if (lhs->class == unknown_sym)
{
- obstack_1grow (&attrs_obstack, c);
- if (defines_flag)
- obstack_1grow (&defines_obstack, c);
-
- switch (c)
- {
- case '\n':
- lineno++;
- break;
-
- case '/':
- copy_comment2 (finput, &defines_obstack, &attrs_obstack);
- break;
-
- case '{':
- count++;
- break;
-
- case '}':
- if (count == 0)
- complain (_("unmatched %s"), "`}'");
- count--;
- if (count <= 0)
- {
- obstack_sgrow (&attrs_obstack, " YYSTYPE;\n");
- if (defines_flag)
- obstack_sgrow (&defines_obstack, " YYSTYPE;\n");
- /* JF don't choke on trailing semi */
- c = skip_white_space ();
- if (c != ';')
- ungetc (c, finput);
- return;
- }
- }
-
- c = getc (finput);
+ lhs->class = nterm_sym;
+ lhs->number = nvars;
+ ++nvars;
}
+ else if (lhs->class == token_sym)
+ complain (_("rule given for %s, which is a token"), lhs->tag);
}
-
-/*-------------------------------------------------------.
-| 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);
-}
-
-
-/*-------------------------------------------------------------------.
-| Parse what comes after %thong. the full syntax is |
-| |
-| %thong <type> token number literal |
-| |
-| the <type> or number may be omitted. The number specifies the |
-| user_token_number. |
-| |
-| Two symbols are entered in the table, one for the token symbol and |
-| one for the literal. Both are given the <type>, if any, from the |
-| declaration. The ->user_token_number of the first is SALIAS and |
-| the ->user_token_number of the second is set to the number, if |
-| any, from the declaration. The two symbols are linked via |
-| pointers in their ->alias fields. |
-| |
-| During OUTPUT_DEFINES_TABLE, the symbol is reported thereafter, |
-| only the literal string is retained it is the literal string that |
-| is output to yytname |
-`-------------------------------------------------------------------*/
+/* Check that the last rule (CURRENT_RULE) is properly defined. For
+ instance, there should be no type clash on the default action. */
static void
-parse_thong_decl (void)
+grammar_current_rule_check (void)
{
- int token;
- struct bucket *symbol;
- char *typename = 0;
- int usrtoknum;
-
- translations = 1;
- token = lex (); /* fetch typename or first token */
- if (token == TYPENAME)
- {
- typename = xstrdup (token_buffer);
- value_components_used = 1;
- token = lex (); /* fetch first token */
- }
+ symbol_t *lhs = current_rule->sym;
+ symbol_t *first_rhs = current_rule->next->sym;
- /* process first token */
+ /* If there is an action, then there is nothing we can do: the user
+ is allowed to shoot in her foot. */
+ if (current_rule->action)
+ return;
- if (token != IDENTIFIER)
+ /* If $$ is being set in default way, report if any type mismatch.
+ */
+ if (first_rhs)
{
- complain (_("unrecognized item %s, expected an identifier"),
- token_buffer);
- skip_to_char ('%');
- return;
- }
- symval->class = token_sym;
- symval->type_name = typename;
- symval->user_token_number = SALIAS;
- symbol = symval;
-
- token = lex (); /* get number or literal string */
-
- if (token == NUMBER)
- {
- usrtoknum = numval;
- token = lex (); /* okay, did number, now get literal */
+ const char *lhs_type = lhs->type_name ? lhs->type_name : "";
+ const char *rhs_type = first_rhs->type_name ? first_rhs->type_name : "";
+ if (strcmp (lhs_type, rhs_type))
+ complain (_("type clash (`%s' `%s') on default action"),
+ lhs_type, rhs_type);
}
+ /* Warn if there is no default for $$ but we need one. */
else
- usrtoknum = 0;
-
- /* process literal string token */
-
- if (token != IDENTIFIER || *symval->tag != '\"')
{
- complain (_("expected string constant instead of %s"), token_buffer);
- skip_to_char ('%');
- return;
+ if (lhs->type_name)
+ complain (_("empty rule for typed nonterminal, and no action"));
}
- symval->class = token_sym;
- symval->type_name = typename;
- symval->user_token_number = usrtoknum;
-
- symval->alias = symbol;
- symbol->alias = symval;
-
- /* symbol and symval combined are only one symbol. */
- nsyms--;
}
-/*----------------------------------------------------------------.
-| Read from finput until `%%' is seen. Discard the `%%'. Handle |
-| any `%' declarations, and copy the contents of any `%{ ... %}' |
-| groups to ATTRS_OBSTACK. |
-`----------------------------------------------------------------*/
+/* End the currently being grown rule. */
-static void
-read_declarations (void)
+void
+grammar_rule_end (void)
{
- int c;
- int tok;
-
- for (;;)
- {
- c = skip_white_space ();
-
- if (c == '%')
- {
- tok = parse_percent_token ();
-
- switch (tok)
- {
- case TWO_PERCENTS:
- return;
-
- case PERCENT_LEFT_CURLY:
- copy_definition ();
- break;
-
- case TOKEN:
- parse_token_decl (token_sym, nterm_sym);
- break;
-
- case NTERM:
- parse_token_decl (nterm_sym, token_sym);
- break;
-
- case TYPE:
- parse_type_decl ();
- break;
-
- case START:
- parse_start_decl ();
- break;
-
- case UNION:
- parse_union_decl ();
- break;
-
- case EXPECT:
- parse_expect_decl ();
- break;
-
- case THONG:
- parse_thong_decl ();
- break;
-
- case LEFT:
- parse_assoc_decl (left_assoc);
- break;
-
- case RIGHT:
- parse_assoc_decl (right_assoc);
- break;
-
- case NONASSOC:
- parse_assoc_decl (non_assoc);
- break;
-
- case NOOP:
- break;
-
- 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 ('%');
- }
- }
+ /* Put an empty link in the list to mark the end of this rule */
+ grammar_symbol_append (NULL);
+ grammar_current_rule_check ();
}
-\f
-/*-------------------------------------------------------------------.
-| Assuming that a `{' has just been seen, copy everything up to the |
-| matching `}' into the actions file. STACK_OFFSET 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 void
-copy_action (symbol_list *rule, int stack_offset)
-{
- int c;
- int count;
- char buf[4096];
-
- /* offset is always 0 if parser has already popped the stack pointer */
- if (semantic_parser)
- stack_offset = 0;
-
- sprintf (buf, "\ncase %d:\n", nrules);
- obstack_grow (&action_obstack, buf, strlen (buf));
-
- if (!no_lines_flag)
- {
- sprintf (buf, "#line %d %s\n",
- lineno, quotearg_style (c_quoting_style, infile));
- obstack_grow (&action_obstack, buf, strlen (buf));
- }
- obstack_1grow (&action_obstack, '{');
-
- count = 1;
- c = getc (finput);
- while (count > 0)
- {
- while (c != '}')
- {
- switch (c)
- {
- case '\n':
- obstack_1grow (&action_obstack, c);
- lineno++;
- break;
-
- case '{':
- obstack_1grow (&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, stack_offset);
- break;
-
- case '@':
- copy_at (finput, &action_obstack,
- stack_offset);
- break;
-
- case EOF:
- fatal (_("unmatched %s"), "`{'");
-
- default:
- obstack_1grow (&action_obstack, c);
- }
-
- c = getc (finput);
- }
- /* above loop exits when c is '}' */
+/* 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. */
- if (--count)
- {
- obstack_1grow (&action_obstack, c);
- c = getc (finput);
- }
- }
-
- obstack_sgrow (&action_obstack, ";\n break;}");
-}
-\f
-/*-------------------------------------------------------------------.
-| After `%guard' is seen in the input file, copy the actual guard |
-| into the guards file. If the guard is followed by an action, copy |
-| that into the actions file. STACK_OFFSET 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, for the simple parser in which |
-| the stack is not popped until after the guard is run. |
-`-------------------------------------------------------------------*/
-
-static void
-copy_guard (symbol_list *rule, int stack_offset)
+void
+grammar_midrule_action (void)
{
- int c;
- int count;
- int brace_flag = 0;
-
- /* offset is always 0 if parser has already popped the stack pointer */
- if (semantic_parser)
- stack_offset = 0;
-
- obstack_fgrow1 (&guard_obstack, "\ncase %d:\n", nrules);
- if (!no_lines_flag)
- obstack_fgrow2 (&guard_obstack, "#line %d %s\n",
- lineno, quotearg_style (c_quoting_style, infile));
- obstack_1grow (&guard_obstack, '{');
-
- count = 0;
- c = getc (finput);
-
- while (brace_flag ? (count > 0) : (c != ';'))
- {
- switch (c)
- {
- case '\n':
- obstack_1grow (&guard_obstack, c);
- lineno++;
- break;
-
- case '{':
- obstack_1grow (&guard_obstack, c);
- brace_flag = 1;
- count++;
- break;
-
- case '}':
- obstack_1grow (&guard_obstack, c);
- if (count > 0)
- count--;
- else
- {
- complain (_("unmatched %s"), "`}'");
- c = getc (finput); /* skip it */
- }
- break;
-
- case '\'':
- case '"':
- copy_string (finput, &guard_obstack, c);
- break;
-
- case '/':
- copy_comment (finput, &guard_obstack);
- break;
-
- case '$':
- copy_dollar (finput, &guard_obstack, rule, stack_offset);
- break;
-
- case '@':
- copy_at (finput, &guard_obstack, stack_offset);
- break;
-
- case EOF:
- fatal ("%s", _("unterminated %guard clause"));
-
- default:
- obstack_1grow (&guard_obstack, c);
- }
-
- if (c != '}' || count != 0)
- c = getc (finput);
- }
-
- c = skip_white_space ();
-
- obstack_sgrow (&guard_obstack, ";\n break;}");
- if (c == '{')
- copy_action (rule, stack_offset);
- else if (c == '=')
- {
- c = getc (finput); /* why not skip_white_space -wjh */
- if (c == '{')
- copy_action (rule, stack_offset);
- }
+ /* 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 *midrule_action = 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. */
+ midrule_action->line = current_rule->line;
+ /* Move the action from the host rule to this one. */
+ midrule_action->action = current_rule->action;
+ midrule_action->action_line = current_rule->action_line;
+ current_rule->action = NULL;
+
+ if (previous_rule)
+ previous_rule->next = midrule_action;
else
- ungetc (c, finput);
-}
-\f
+ grammar = midrule_action;
-static void
-record_rule_line (void)
-{
- /* Record each rule's source line number in rline table. */
+ /* End of the rule. */
+ previous_rule = symbol_list_new (NULL);
+ previous_rule->next = current_rule;
- if (nrules >= rline_allocated)
- {
- rline_allocated = nrules * 2;
- rline = XREALLOC (rline, short, rline_allocated);
- }
- rline[nrules] = lineno;
-}
+ midrule_action->next = previous_rule;
-
-/*-------------------------------------------------------------------.
-| Generate a dummy symbol, a nonterminal, whose name cannot conflict |
-| with the user's names. |
-`-------------------------------------------------------------------*/
-
-static bucket *
-gensym (void)
-{
- bucket *sym;
-
- sprintf (token_buffer, "@%d", ++gensym_count);
- sym = getsym (token_buffer);
- sym->class = nterm_sym;
- sym->value = nvars++;
- return sym;
+ /* Insert the dummy generated by that rule into this rule. */
+ ++nritems;
+ grammar_symbol_append (sdummy);
}
-#if 0
-/*------------------------------------------------------------------.
-| read in a %type declaration and record its information for |
-| get_type_name to access. This is unused. It is only called from |
-| the #if 0 part of readgram |
-`------------------------------------------------------------------*/
+/* Set the precedence symbol of the current rule to PRECSYM. */
-static int
-get_type (void)
+void
+grammar_current_rule_prec_set (symbol_t *precsym)
{
- int k;
- int t;
- char *name;
-
- t = lex ();
-
- if (t != TYPENAME)
- {
- complain (_("invalid %s declaration"), "%type");
- return t;
- }
-
- name = xstrdup (token_buffer);
-
- for (;;)
- {
- t = lex ();
-
- switch (t)
- {
- case SEMICOLON:
- return lex ();
-
- case COMMA:
- break;
-
- case IDENTIFIER:
- if (symval->type_name == NULL)
- symval->type_name = name;
- else if (strcmp (name, symval->type_name) != 0)
- complain (_("type redeclaration for %s"), symval->tag);
-
- break;
-
- default:
- return t;
- }
- }
+ if (current_rule->ruleprec)
+ complain (_("two @prec's in a row"));
+ current_rule->ruleprec = precsym;
}
-#endif
-\f
-/*------------------------------------------------------------------.
-| Parse the input grammar into a one symbol_list structure. Each |
-| rule is represented by a sequence of symbols: the left hand side |
-| followed by the contents of the right hand side, followed by a |
-| null pointer instead of a symbol to terminate the rule. The next |
-| symbol is the lhs of the following rule. |
-| |
-| All guards and actions are copied out to the appropriate files, |
-| labelled by the rule number they apply to. |
-`------------------------------------------------------------------*/
-
-static void
-readgram (void)
-{
- int t;
- bucket *lhs = NULL;
- symbol_list *p;
- symbol_list *p1;
- bucket *bp;
-
- /* Points to first symbol_list of current rule. its symbol is the
- lhs of the rule. */
- symbol_list *crule;
- /* Points to the symbol_list preceding crule. */
- symbol_list *crule1;
-
- p1 = NULL;
-
- t = lex ();
-
- while (t != TWO_PERCENTS && t != ENDFILE)
- {
- if (t == IDENTIFIER || t == 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 */
- bucket *first_rhs = 0;
-
- if (t == IDENTIFIER)
- {
- lhs = symval;
-
- if (!start_flag)
- {
- startval = lhs;
- start_flag = 1;
- }
-
- t = lex ();
- if (t != COLON)
- {
- complain (_("ill-formed rule: initial symbol not followed by colon"));
- unlex (t);
- }
- }
-
- if (nrules == 0 && t == BAR)
- {
- complain (_("grammar starts with vertical bar"));
- lhs = symval; /* BOGUS: use a random symval */
- }
- /* start a new rule and record its lhs. */
-
- nrules++;
- nitems++;
-
- record_rule_line ();
-
- p = XCALLOC (symbol_list, 1);
- p->sym = lhs;
-
- crule1 = p1;
- if (p1)
- p1->next = p;
- else
- grammar = p;
-
- p1 = p;
- crule = p;
-
- /* mark the rule's lhs as a nonterminal if not already so. */
-
- if (lhs->class == unknown_sym)
- {
- lhs->class = nterm_sym;
- lhs->value = nvars;
- nvars++;
- }
- else if (lhs->class == token_sym)
- complain (_("rule given for %s, which is a token"), lhs->tag);
-
- /* read the rhs of the rule. */
-
- for (;;)
- {
- t = lex ();
- if (t == PREC)
- {
- t = lex ();
- crule->ruleprec = symval;
- t = lex ();
- }
-
- if (!(t == IDENTIFIER || t == LEFT_CURLY))
- break;
-
- /* If next token is an identifier, see if a colon follows it.
- If one does, exit this rule now. */
- if (t == IDENTIFIER)
- {
- bucket *ssave;
- int t1;
-
- ssave = symval;
- t1 = lex ();
- unlex (t1);
- symval = ssave;
- if (t1 == COLON)
- 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)
- {
- bucket *sdummy;
-
- /* 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. */
- sdummy = gensym ();
-
- /* Make a new rule, whose body is empty,
- before the current one, so that the action
- just read can belong to it. */
- nrules++;
- nitems++;
- record_rule_line ();
- p = XCALLOC (symbol_list, 1);
- if (crule1)
- crule1->next = p;
- else
- grammar = p;
- p->sym = sdummy;
- crule1 = XCALLOC (symbol_list, 1);
- p->next = crule1;
- crule1->next = crule;
-
- /* Insert the dummy generated by that rule into this
- rule. */
- nitems++;
- p = XCALLOC (symbol_list, 1);
- p->sym = sdummy;
- p1->next = p;
- p1 = p;
-
- action_flag = 0;
- }
-
- if (t == IDENTIFIER)
- {
- nitems++;
- p = XCALLOC (symbol_list, 1);
- p->sym = symval;
- p1->next = p;
- p1 = p;
- }
- else /* handle an action. */
- {
- copy_action (crule, 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 */
- p = XCALLOC (symbol_list, 1);
- p1->next = p;
- p1 = p;
-
- if (t == PREC)
- {
- complain (_("two @prec's in a row"));
- t = lex ();
- crule->ruleprec = symval;
- t = lex ();
- }
- if (t == GUARD)
- {
- if (!semantic_parser)
- complain (_("%%guard present but %%semantic_parser not specified"));
-
- copy_guard (crule, rulelength);
- t = lex ();
- }
- else if (t == LEFT_CURLY)
- {
- /* This case never occurs -wjh */
- if (action_flag)
- complain (_("two actions at end of one rule"));
- copy_action (crule, 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 == SEMICOLON)
- t = lex ();
- }
-#if 0
- /* these things can appear as alternatives to rules. */
-/* NO, they cannot.
- a) none of the documentation allows them
- b) most of them scan forward until finding a next %
- thus they may swallow lots of intervening rules
-*/
- else if (t == TOKEN)
- {
- parse_token_decl (token_sym, nterm_sym);
- t = lex ();
- }
- else if (t == NTERM)
- {
- parse_token_decl (nterm_sym, token_sym);
- t = lex ();
- }
- else if (t == TYPE)
- {
- t = get_type ();
- }
- else if (t == UNION)
- {
- parse_union_decl ();
- t = lex ();
- }
- else if (t == EXPECT)
- {
- parse_expect_decl ();
- t = lex ();
- }
- else if (t == START)
- {
- parse_start_decl ();
- t = lex ();
- }
-#endif
-
- else
- {
- complain (_("invalid input: %s"), token_buffer);
- t = lex ();
- }
- }
-
- /* grammar has been read. Do some checking */
+/* Attach a SYMBOL to the current rule. If needed, move the previous
+ action as a mid-rule action. */
- if (nsyms > MAXSHORT)
- fatal (_("too many symbols (tokens plus nonterminals); maximum %d"),
- MAXSHORT);
- if (nrules == 0)
- fatal (_("no rules in the input grammar"));
-
- /* JF put out same default YYSTYPE as YACC does */
- if (typed == 0
- && !value_components_used)
- {
- /* We used to use `unsigned long' as YYSTYPE on MSDOS,
- but it seems better to be consistent.
- Most programs should declare their own type anyway. */
- obstack_sgrow (&attrs_obstack,
- "#ifndef YYSTYPE\n#define YYSTYPE int\n#endif\n");
- if (defines_flag)
- obstack_sgrow (&defines_obstack, "\
-#ifndef YYSTYPE\n\
-# define YYSTYPE int\n\
-#endif\n");
- }
-
- /* Report any undefined symbols and consider them nonterminals. */
-
- for (bp = firstsymbol; bp; bp = bp->next)
- if (bp->class == unknown_sym)
- {
- complain (_
- ("symbol %s is used, but is not defined as a token and has no rules"),
- bp->tag);
- bp->class = nterm_sym;
- bp->value = nvars++;
- }
-
- ntokens = nsyms - nvars;
-}
-\f
-/*--------------------------------------------------------------.
-| For named tokens, but not literal ones, define the name. The |
-| value is the user token number. |
-`--------------------------------------------------------------*/
-
-static void
-output_token_defines (struct obstack *oout)
+void
+grammar_current_rule_symbol_append (symbol_t *symbol)
{
- bucket *bp;
- char *cp, *symbol;
- char c;
-
- for (bp = firstsymbol; bp; bp = bp->next)
- {
- symbol = bp->tag; /* get symbol */
-
- if (bp->value >= ntokens)
- continue;
- if (bp->user_token_number == SALIAS)
- continue;
- if ('\'' == *symbol)
- continue; /* skip literal character */
- if (bp == errtoken)
- continue; /* skip error token */
- if ('\"' == *symbol)
- {
- /* use literal string only if given a symbol with an alias */
- if (bp->alias)
- symbol = bp->alias->tag;
- else
- continue;
- }
-
- /* Don't #define nonliteral tokens whose names contain periods. */
- cp = symbol;
- while ((c = *cp++) && c != '.');
- if (c != '\0')
- continue;
-
- obstack_fgrow2 (oout, "#define\t%s\t%d\n",
- symbol,
- ((translations && !raw_flag)
- ? bp->user_token_number : bp->value));
- if (semantic_parser)
- obstack_fgrow2 (oout, "#define\tT%s\t%d\n", symbol, bp->value);
- }
-
- obstack_1grow (oout, '\n');
+ if (current_rule->action)
+ grammar_midrule_action ();
+ ++nritems;
+ grammar_symbol_append (symbol);
}
-/*------------------------------------------------------------------.
-| Assign symbol numbers, and write definition of token names into |
-| FDEFINES. Set up vectors TAGS and SPREC of names and precedences |
-| of symbols. |
-`------------------------------------------------------------------*/
+/* Attach an ACTION to the current rule. If needed, move the previous
+ action as a mid-rule action. */
-static void
-packsymbols (void)
+void
+grammar_current_rule_action_append (const char *action, int action_line)
{
- bucket *bp;
- int tokno = 1;
- int i;
- int last_user_token_number;
- static char DOLLAR[] = "$";
-
- /* int lossage = 0; JF set but not used */
-
- tags = XCALLOC (char *, nsyms + 1);
- tags[0] = DOLLAR;
- user_toknums = XCALLOC (short, nsyms + 1);
- user_toknums[0] = 0;
-
- sprec = XCALLOC (short, nsyms);
- sassoc = XCALLOC (short, nsyms);
-
- max_user_token_number = 256;
- last_user_token_number = 256;
-
- for (bp = firstsymbol; bp; bp = bp->next)
- {
- if (bp->class == nterm_sym)
- {
- bp->value += ntokens;
- }
- else if (bp->alias)
- {
- /* this symbol and its alias are a single token defn.
- allocate a tokno, and assign to both check agreement of
- ->prec and ->assoc fields and make both the same */
- if (bp->value == 0)
- bp->value = bp->alias->value = tokno++;
-
- if (bp->prec != bp->alias->prec)
- {
- if (bp->prec != 0 && bp->alias->prec != 0
- && bp->user_token_number == SALIAS)
- complain (_("conflicting precedences for %s and %s"),
- bp->tag, bp->alias->tag);
- if (bp->prec != 0)
- bp->alias->prec = bp->prec;
- else
- bp->prec = bp->alias->prec;
- }
-
- if (bp->assoc != bp->alias->assoc)
- {
- if (bp->assoc != 0 && bp->alias->assoc != 0
- && bp->user_token_number == SALIAS)
- complain (_("conflicting assoc values for %s and %s"),
- bp->tag, bp->alias->tag);
- if (bp->assoc != 0)
- bp->alias->assoc = bp->assoc;
- else
- bp->assoc = bp->alias->assoc;
- }
-
- if (bp->user_token_number == SALIAS)
- continue; /* do not do processing below for SALIASs */
-
- }
- else /* bp->class == token_sym */
- {
- bp->value = tokno++;
- }
-
- if (bp->class == token_sym)
- {
- if (translations && !(bp->user_token_number))
- bp->user_token_number = ++last_user_token_number;
- if (bp->user_token_number > max_user_token_number)
- max_user_token_number = bp->user_token_number;
- }
-
- tags[bp->value] = bp->tag;
- user_toknums[bp->value] = bp->user_token_number;
- sprec[bp->value] = bp->prec;
- sassoc[bp->value] = bp->assoc;
-
- }
-
- if (translations)
- {
- int j;
-
- token_translations = XCALLOC (short, max_user_token_number + 1);
-
- /* initialize all entries for literal tokens to 2, the internal
- token number for $undefined., which represents all invalid
- inputs. */
- for (j = 0; j <= max_user_token_number; j++)
- token_translations[j] = 2;
-
- for (bp = firstsymbol; bp; bp = bp->next)
- {
- if (bp->value >= ntokens)
- continue; /* non-terminal */
- if (bp->user_token_number == SALIAS)
- continue;
- if (token_translations[bp->user_token_number] != 2)
- complain (_("tokens %s and %s both assigned number %d"),
- tags[token_translations[bp->user_token_number]],
- bp->tag, bp->user_token_number);
- token_translations[bp->user_token_number] = bp->value;
- }
- }
-
- error_token_number = errtoken->value;
-
- if (!no_parser_flag)
- output_token_defines (&table_obstack);
-
- if (startval->class == unknown_sym)
- fatal (_("the start symbol %s is undefined"), startval->tag);
- else if (startval->class == token_sym)
- fatal (_("the start symbol %s is a token"), startval->tag);
-
- start_symbol = startval->value;
-
- if (defines_flag)
- {
- output_token_defines (&defines_obstack);
-
- if (!pure_parser)
- {
- if (spec_name_prefix)
- obstack_fgrow1 (&defines_obstack, "\nextern YYSTYPE %slval;\n",
- spec_name_prefix);
- else
- obstack_sgrow (&defines_obstack,
- "\nextern YYSTYPE yylval;\n");
- }
-
- if (semantic_parser)
- for (i = ntokens; i < nsyms; i++)
- {
- /* don't make these for dummy nonterminals made by gensym. */
- if (*tags[i] != '@')
- obstack_fgrow2 (&defines_obstack,
- "#define\tNT%s\t%d\n", tags[i], i);
- }
-#if 0
- /* `fdefines' is now a temporary file, so we need to copy its
- contents in `done', so we can't close it here. */
- fclose (fdefines);
- fdefines = NULL;
-#endif
- }
+ if (current_rule->action)
+ grammar_midrule_action ();
+ current_rule->action = action;
+ current_rule->action_line = action_line;
}
-
+\f
/*---------------------------------------------------------------.
| Convert the rules into the representation using RRHS, RLHS and |
-| RITEMS. |
+| RITEM. |
`---------------------------------------------------------------*/
static void
packgram (void)
{
- int itemno;
+ unsigned int itemno;
int ruleno;
symbol_list *p;
- bucket *ruleprec;
-
- ritem = XCALLOC (short, nitems + 1);
- rlhs = XCALLOC (short, nrules) - 1;
- rrhs = XCALLOC (short, nrules) - 1;
- rprec = XCALLOC (short, nrules) - 1;
- rprecsym = XCALLOC (short, nrules) - 1;
- rassoc = XCALLOC (short, nrules) - 1;
+ ritem = XCALLOC (item_number_t, nritems);
+ rules = XCALLOC (rule_t, nrules) - 1;
itemno = 0;
ruleno = 1;
p = grammar;
while (p)
{
- rlhs[ruleno] = p->sym->value;
- rrhs[ruleno] = itemno;
- ruleprec = p->ruleprec;
+ symbol_t *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].action = p->action;
+ rules[ruleno].action_line = p->action_line;
p = p->next;
while (p && p->sym)
{
- ritem[itemno++] = p->sym->value;
+ /* item_number_t = symbol_number_t.
+ 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)
- {
- rprec[ruleno] = p->sym->prec;
- rassoc[ruleno] = p->sym->assoc;
- }
+ rules[ruleno].prec = p->sym;
if (p)
p = p->next;
}
the specified symbol's precedence replaces the default. */
if (ruleprec)
{
- rprec[ruleno] = ruleprec->prec;
- rassoc[ruleno] = ruleprec->assoc;
- rprecsym[ruleno] = ruleprec->value;
+ rules[ruleno].precsym = ruleprec;
+ rules[ruleno].prec = ruleprec;
}
-
ritem[itemno++] = -ruleno;
- ruleno++;
+ ++ruleno;
if (p)
p = p->next;
}
- ritem[itemno] = 0;
+ assert (itemno == nritems);
+
+ if (trace_flag)
+ ritem_print (stderr);
}
\f
-/*-------------------------------------------------------------------.
-| Read in the grammar specification and record it in the format |
-| described in gram.h. All guards are copied into the GUARD_OBSTACK |
-| and all actions into ACTION_OBSTACK, in each case forming the body |
-| of a C function (YYGUARD or YYACTION) which contains a switch |
-| statement to decide which guard or action to execute. |
-`-------------------------------------------------------------------*/
+/*------------------------------------------------------------------.
+| Read in the grammar specification and record it in the format |
+| described in gram.h. All actions are copied into ACTION_OBSTACK, |
+| in each case forming the body of a C function (YYACTION) which |
+| contains a switch statement to decide which action to execute. |
+`------------------------------------------------------------------*/
void
reader (void)
{
- start_flag = 0;
- startval = NULL; /* start symbol not specified yet. */
-
-#if 0
- /* initially assume token number translation not needed. */
- translations = 0;
-#endif
- /* Nowadays translations is always set to 1, since we give `error' a
- user-token-number to satisfy the Posix demand for YYERRCODE==256.
- */
- translations = 1;
-
- nsyms = 1;
- nvars = 0;
- nrules = 0;
- nitems = 0;
- rline_allocated = 10;
- rline = XCALLOC (short, rline_allocated);
-
- typed = 0;
- lastprec = 0;
-
- gensym_count = 0;
+ gram_control_t gram_control;
+ lineno = 1;
- semantic_parser = 0;
- pure_parser = 0;
+ /* Initialize the muscle obstack. */
+ obstack_init (&muscle_obstack);
- grammar = NULL;
+ /* Initialize the symbol table. */
+ symbols_new ();
- init_lex ();
- lineno = 1;
+ /* Construct the axiom symbol. */
+ axiom = getsym ("$axiom");
+ axiom->class = nterm_sym;
+ axiom->number = nvars++;
- /* Initialize the symbol table. */
- tabinit ();
/* Construct the error token */
errtoken = getsym ("error");
errtoken->class = token_sym;
- errtoken->user_token_number = 256; /* Value specified by POSIX. */
+ errtoken->number = ntokens++;
+
/* Construct a token that represents all undefined literal tokens.
It is always token number 2. */
undeftoken = getsym ("$undefined.");
undeftoken->class = token_sym;
- undeftoken->user_token_number = 2;
-
- /* Read the declaration section. Copy %{ ... %} groups to
- TABLE_OBSTACK and FDEFINES file. Also notice any %token, %left,
- etc. found there. */
- obstack_1grow (&table_obstack, '\n');
- obstack_fgrow3 (&table_obstack, "\
-/* %s, made from %s\n\
- by GNU bison %s. */\n\
-\n",
- no_parser_flag ? "Bison-generated parse tables" : "A Bison parser",
- infile, VERSION);
-
- obstack_sgrow (&table_obstack,
- "#define YYBISON 1 /* Identify Bison output. */\n\n");
- read_declarations ();
- /* Start writing the guard and action files, if they are needed. */
- output_headers ();
- /* Read in the grammar, build grammar in list form. Write out
- guards and actions. */
- readgram ();
- /* Now we know whether we need the line-number stack. If we do,
- write its type into the .tab.h file. */
- if (defines_flag)
- reader_output_yylsp (&defines_obstack);
- /* Write closing delimiters for actions and guards. */
- output_trailers ();
- if (locations_flag)
- obstack_sgrow (&table_obstack, "#define YYLSP_NEEDED 1\n\n");
+ undeftoken->number = ntokens++;
+
+ /* Initialize the obstacks. */
+ obstack_init (&action_obstack);
+ obstack_init (&output_obstack);
+ obstack_init (&pre_prologue_obstack);
+ obstack_init (&post_prologue_obstack);
+
+ finput = xfopen (infile, "r");
+ gram_in = finput;
+
+ gram_debug = !!getenv ("parse");
+ gram__flex_debug = !!getenv ("scan");
+ gram_parse (&gram_control);
+
+ /* Grammar has been read. Do some checking */
+ if (nrules == 0)
+ fatal (_("no rules in the input grammar"));
+
+ /* Report any undefined symbols and consider them nonterminals. */
+ symbols_check_defined ();
+
+ /* If the user did not define her EOFTOKEN, do it now. */
+ if (!eoftoken)
+ {
+ eoftoken = getsym ("$");
+ eoftoken->class = token_sym;
+ eoftoken->number = 0;
+ /* Value specified by POSIX. */
+ eoftoken->user_token_number = 0;
+ }
+
+ /* Insert the initial rule, which line is that of the first rule
+ (not that of the start symbol):
+
+ 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);
+
+ assert (nsyms == ntokens + nvars);
+
+ xfclose (finput);
+
/* Assign the symbols their symbol numbers. Write #defines for the
token symbols into FDEFINES if requested. */
- packsymbols ();
+ symbols_pack ();
+
/* Convert the grammar into the format described in gram.h. */
packgram ();
- /* Free the symbol table data structure since symbols are now all
- referred to by symbol number. */
- free_symtab ();
-}
-
-/*------------------------------------------------------------------.
-| Define YYLTYPE. Cannot be in the skeleton since we might have to |
-| output it in the headers if --defines is used. |
-`------------------------------------------------------------------*/
-
-void
-reader_output_yylsp (struct obstack *oout)
-{
- if (locations_flag)
- obstack_sgrow (oout, "\
-\n\
-#ifndef YYLTYPE\n\
-typedef struct yyltype\n\
-{\n\
- int first_line;\n\
- int first_column;\n\
-\n\
- int last_line;\n\
- int last_column;\n\
-} yyltype;\n\
-\n\
-# define YYLTYPE yyltype\n\
-#endif\n\
-\n");
+ /* The grammar as a symbol_list is no longer needed. */
+ LIST_FREE (symbol_list, grammar);
}
projects / bison.git / blobdiff