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- /* Input parser for bison
- Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
- This file is part of Bison, the GNU Compiler Compiler.
- Bison is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
- Bison is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with Bison; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
- /* read in the grammar specification and record it in the format described in gram.h.
- All guards are copied into the fguard file and all actions into faction,
- 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.
- The entry point is reader(). */
- #include <stdio.h>
- #include <ctype.h>
- #include "system.h"
- #include "files.h"
- #include "new.h"
- #include "symtab.h"
- #include "lex.h"
- #include "gram.h"
- #include "machine.h"
- #define LTYPESTR "\n#ifndef YYLTYPE\ntypedef\n struct yyltype\n\
- {\n int timestamp;\n int first_line;\n int first_column;\
- \n int last_line;\n int last_column;\n char *text;\n }\n\
- yyltype;\n\n#define YYLTYPE yyltype\n#endif\n\n"
- /* Number of slots allocated (but not necessarily used yet) in `rline' */
- int rline_allocated;
- extern char *program_name;
- extern int definesflag;
- extern int nolinesflag;
- extern bucket *symval;
- extern int numval;
- extern int failure;
- extern int expected_conflicts;
- extern char *token_buffer;
- extern int atoi ();
- extern void init_lex();
- extern void tabinit();
- extern void output_headers();
- extern void output_trailers();
- extern void free_symtab();
- extern void open_extra_files();
- extern void fatal();
- extern void fatals();
- extern void unlex();
- extern void done();
- extern int skip_white_space();
- extern int parse_percent_token();
- extern int lex();
- void read_declarations();
- void copy_definition();
- void parse_token_decl();
- void parse_start_decl();
- void parse_type_decl();
- void parse_assoc_decl();
- void parse_union_decl();
- void parse_expect_decl();
- void copy_action();
- void readgram();
- void record_rule_line();
- void packsymbols();
- void output_token_defines();
- void packgram();
- int read_signed_integer();
- int get_type();
- typedef
- struct symbol_list
- {
- struct symbol_list *next;
- bucket *sym;
- bucket *ruleprec;
- }
- symbol_list;
- int lineno;
- symbol_list *grammar;
- int start_flag;
- bucket *startval;
- char **tags;
- /* Nonzero if components of semantic values are used, implying
- they must be unions. */
- static int value_components_used;
- static int typed; /* nonzero if %union has been seen. */
- static int lastprec; /* incremented for each %left, %right or %nonassoc seen */
- static int gensym_count; /* incremented for each generated symbol */
- static bucket *errtoken;
- /* Nonzero if any action or guard uses the @n construct. */
- static int yylsp_needed;
- extern char *version_string;
- void
- reader()
- {
- start_flag = 0;
- startval = NULL; /* start symbol not specified yet. */
- #if 0
- translations = 0; /* initially assume token number translation not needed. */
- #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 = NEW2(rline_allocated, short);
- typed = 0;
- lastprec = 0;
- gensym_count = 0;
- semantic_parser = 0;
- pure_parser = 0;
- yylsp_needed = 0;
- grammar = NULL;
- init_lex();
- lineno = 1;
- /* initialize the symbol table. */
- tabinit();
- /* construct the error token */
- errtoken = getsym("error");
- errtoken->class = STOKEN;
- errtoken->user_token_number = 256; /* Value specified by posix. */
- /* construct a token that represents all undefined literal tokens. */
- /* it is always token number 2. */
- getsym("$illegal.")->class = STOKEN;
- /* Read the declaration section. Copy %{ ... %} groups to ftable and fdefines file.
- Also notice any %token, %left, etc. found there. */
- fprintf(ftable, "\n/* A Bison parser, made from %s", infile);
- fprintf(ftable, " with Bison version %s */\n\n", version_string);
- fprintf(ftable, "#define YYBISON 1 /* Identify Bison output. */\n\n");
- read_declarations();
- /* output the definition of YYLTYPE into the fattrs and fdefines files. */
- /* fattrs winds up in the .tab.c file, before bison.simple. */
- fprintf(fattrs, LTYPESTR);
- /* 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 (yylsp_needed)
- {
- if (fdefines)
- fprintf(fdefines, LTYPESTR);
- }
- /* write closing delimiters for actions and guards. */
- output_trailers();
- if (yylsp_needed)
- fprintf(ftable, "#define YYLSP_NEEDED\n\n");
- /* assign the symbols their symbol numbers.
- Write #defines for the token symbols into fdefines if requested. */
- packsymbols();
- /* 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();
- }
- /* read from finput until %% is seen. Discard the %%.
- Handle any % declarations,
- and copy the contents of any %{ ... %} groups to fattrs. */
- void
- read_declarations ()
- {
- register int c;
- register 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 (STOKEN, SNTERM);
- break;
-
- case NTERM:
- parse_token_decl (SNTERM, STOKEN);
- 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 LEFT:
- parse_assoc_decl(LEFT_ASSOC);
- break;
- case RIGHT:
- parse_assoc_decl(RIGHT_ASSOC);
- break;
- case NONASSOC:
- parse_assoc_decl(NON_ASSOC);
- break;
- case SEMANTIC_PARSER:
- if (semantic_parser == 0)
- {
- semantic_parser = 1;
- open_extra_files();
- }
- break;
- case PURE_PARSER:
- pure_parser = 1;
- break;
- default:
- fatal("junk after `%%' in definition section");
- }
- }
- else if (c == EOF)
- fatal("no input grammar");
- else if (c >= 040 && c <= 0177)
- fatals ("unknown character `%c' in declaration section", c);
- else
- fatals ("unknown character with code 0x%x in declaration section", c);
- }
- }
- /* copy the contents of a %{ ... %} into the definitions file.
- The %{ has already been read. Return after reading the %}. */
- void
- copy_definition ()
- {
- register int c;
- register int match;
- register int ended;
- register int after_percent; /* -1 while reading a character if prev char was % */
- int cplus_comment;
- if (!nolinesflag)
- fprintf(fattrs, "#line %d \"%s\"\n", lineno, infile);
- after_percent = 0;
- c = getc(finput);
- for (;;)
- {
- switch (c)
- {
- case '\n':
- putc(c, fattrs);
- lineno++;
- break;
- case '%':
- after_percent = -1;
- break;
-
- case '\'':
- case '"':
- match = c;
- putc(c, fattrs);
- c = getc(finput);
- while (c != match)
- {
- if (c == EOF || c == '\n')
- fatal("unterminated string");
- putc(c, fattrs);
-
- if (c == '\\')
- {
- c = getc(finput);
- if (c == EOF)
- fatal("unterminated string");
- putc(c, fattrs);
- if (c == '\n')
- lineno++;
- }
- c = getc(finput);
- }
- putc(c, fattrs);
- break;
- case '/':
- putc(c, fattrs);
- c = getc(finput);
- if (c != '*' && c != '/')
- continue;
- cplus_comment = (c == '/');
- putc(c, fattrs);
- c = getc(finput);
- ended = 0;
- while (!ended)
- {
- if (!cplus_comment && c == '*')
- {
- while (c == '*')
- {
- putc(c, fattrs);
- c = getc(finput);
- }
- if (c == '/')
- {
- putc(c, fattrs);
- ended = 1;
- }
- }
- else if (c == '\n')
- {
- lineno++;
- putc(c, fattrs);
- if (cplus_comment)
- ended = 1;
- else
- c = getc(finput);
- }
- else if (c == EOF)
- fatal("unterminated comment in `%{' definition");
- else
- {
- putc(c, fattrs);
- c = getc(finput);
- }
- }
- break;
- case EOF:
- fatal("unterminated `%{' definition");
- default:
- putc(c, fattrs);
- }
- c = getc(finput);
- if (after_percent)
- {
- if (c == '}')
- return;
- putc('%', fattrs);
- }
- after_percent = 0;
- }
- }
- /* parse what comes after %token or %nterm.
- For %token, what_is is STOKEN and what_is_not is SNTERM.
- For %nterm, the arguments are reversed. */
- void
- parse_token_decl (what_is, what_is_not)
- int what_is, what_is_not;
- {
- /* register int start_lineno; JF */
- register int token = 0;
- register int prev;
- register char *typename = 0;
- int k;
- /* start_lineno = lineno; JF */
- for (;;)
- {
- if(ungetc(skip_white_space(), finput) == '%')
- return;
- /* if (lineno != start_lineno)
- return; JF */
- /* we have not passed a newline, so the token now starting is in this declaration */
- prev = token;
- token = lex();
- if (token == COMMA)
- continue;
- if (token == TYPENAME)
- {
- k = strlen(token_buffer);
- typename = NEW2(k + 1, char);
- strcpy(typename, token_buffer);
- value_components_used = 1;
- }
- else if (token == IDENTIFIER)
- {
- int oldclass = symval->class;
- if (symval->class == what_is_not)
- fatals("symbol %s redefined", symval->tag);
- symval->class = what_is;
- if (what_is == SNTERM && oldclass != SNTERM)
- symval->value = nvars++;
- if (typename)
- {
- if (symval->type_name == NULL)
- symval->type_name = typename;
- else
- fatals("type redeclaration for %s", symval->tag);
- }
- }
- else if (prev == IDENTIFIER && token == NUMBER)
- {
- symval->user_token_number = numval;
- translations = 1;
- }
- else
- fatal("invalid text in %token or %nterm declaration");
- }
- }
- /* parse what comes after %start */
- void
- parse_start_decl ()
- {
- if (start_flag)
- fatal("multiple %start declarations");
- start_flag = 1;
- if (lex() != IDENTIFIER)
- fatal("invalid %start declaration");
- startval = symval;
- }
- /* read in a %type declaration and record its information for get_type_name to access */
- void
- parse_type_decl ()
- {
- register int k;
- register char *name;
- /* register int start_lineno; JF */
- if (lex() != TYPENAME)
- fatal("ill-formed %type declaration");
- k = strlen(token_buffer);
- name = NEW2(k + 1, char);
- strcpy(name, token_buffer);
- /* start_lineno = lineno; */
- for (;;)
- {
- register int t;
- if(ungetc(skip_white_space(), finput) == '%')
- return;
- /* if (lineno != start_lineno)
- return; JF */
- /* we have not passed a newline, so the token now starting is in this declaration */
- t = lex();
- switch (t)
- {
- case COMMA:
- case SEMICOLON:
- break;
- case IDENTIFIER:
- if (symval->type_name == NULL)
- symval->type_name = name;
- else
- fatals("type redeclaration for %s", symval->tag);
- break;
- default:
- fatal("invalid %type declaration");
- }
- }
- }
- /* read in a %left, %right or %nonassoc declaration and record its information. */
- /* assoc is either LEFT_ASSOC, RIGHT_ASSOC or NON_ASSOC. */
- void
- parse_assoc_decl (assoc)
- int assoc;
- {
- register int k;
- register char *name = NULL;
- /* register int start_lineno; JF */
- register int prev = 0; /* JF added = 0 to keep lint happy */
- lastprec++; /* Assign a new precedence level, never 0. */
- /* start_lineno = lineno; */
- for (;;)
- {
- register int t;
- if(ungetc(skip_white_space(), finput) == '%')
- return;
- /* if (lineno != start_lineno)
- return; JF */
- /* we have not passed a newline, so the token now starting is in this declaration */
- t = lex();
- switch (t)
- {
- case TYPENAME:
- k = strlen(token_buffer);
- name = NEW2(k + 1, char);
- strcpy(name, token_buffer);
- break;
- case COMMA:
- break;
- case IDENTIFIER:
- if (symval->prec != 0)
- fatals("redefining precedence of %s", symval->tag);
- symval->prec = lastprec;
- symval->assoc = assoc;
- if (symval->class == SNTERM)
- fatals("symbol %s redefined", symval->tag);
- symval->class = STOKEN;
- if (name)
- { /* record the type, if one is specified */
- if (symval->type_name == NULL)
- symval->type_name = name;
- else
- fatals("type redeclaration for %s", symval->tag);
- }
- break;
- case NUMBER:
- if (prev == IDENTIFIER)
- {
- symval->user_token_number = numval;
- translations = 1;
- }
- else
- fatal("invalid text in association declaration");
- break;
- case SEMICOLON:
- return;
- default:
- fatal("malformatted association declaration");
- }
- prev = t;
- }
- }
- /* copy the union declaration into fattrs (and fdefines),
- where it is made into the
- definition of YYSTYPE, the type of elements of the parser value stack. */
- void
- parse_union_decl()
- {
- register int c;
- register int count;
- register int in_comment;
- int cplus_comment;
- if (typed)
- fatal("multiple %union declarations");
- typed = 1;
- if (!nolinesflag)
- fprintf(fattrs, "\n#line %d \"%s\"\n", lineno, infile);
- else
- fprintf(fattrs, "\n");
- fprintf(fattrs, "typedef union");
- if (fdefines)
- fprintf(fdefines, "typedef union");
- count = 0;
- in_comment = 0;
- c = getc(finput);
- while (c != EOF)
- {
- putc(c, fattrs);
- if (fdefines)
- putc(c, fdefines);
- switch (c)
- {
- case '\n':
- lineno++;
- break;
- case '/':
- c = getc(finput);
- if (c != '*' && c != '/')
- ungetc(c, finput);
- else
- {
- putc(c, fattrs);
- if (fdefines)
- putc(c, fdefines);
- cplus_comment = (c == '/');
- in_comment = 1;
- c = getc(finput);
- while (in_comment)
- {
- putc(c, fattrs);
- if (fdefines)
- putc(c, fdefines);
- if (c == '\n')
- {
- lineno++;
- if (cplus_comment)
- {
- in_comment = 0;
- break;
- }
- }
- if (c == EOF)
- fatal("unterminated comment");
- if (!cplus_comment && c == '*')
- {
- c = getc(finput);
- if (c == '/')
- {
- putc('/', fattrs);
- if (fdefines)
- putc('/', fdefines);
- in_comment = 0;
- }
- }
- else
- c = getc(finput);
- }
- }
- break;
- case '{':
- count++;
- break;
- case '}':
- if (count == 0)
- fatal ("unmatched close-brace (`}')");
- count--;
- if (count == 0)
- {
- fprintf(fattrs, " YYSTYPE;\n");
- if (fdefines)
- fprintf(fdefines, " YYSTYPE;\n");
- /* JF don't choke on trailing semi */
- c=skip_white_space();
- if(c!=';') ungetc(c,finput);
- return;
- }
- }
- c = getc(finput);
- }
- }
- /* parse the declaration %expect N which says to expect N
- shift-reduce conflicts. */
- void
- parse_expect_decl()
- {
- register int c;
- register int count;
- char buffer[20];
- c = getc(finput);
- while (c == ' ' || c == '\t')
- c = getc(finput);
- count = 0;
- while (c >= '0' && c <= '9')
- {
- if (count < 20)
- buffer[count++] = c;
- c = getc(finput);
- }
- buffer[count] = 0;
- ungetc (c, finput);
- expected_conflicts = atoi (buffer);
- }
- /* that's all of parsing the declaration section */
- /* Get the data type (alternative in the union) of the value for symbol n in rule rule. */
- char *
- get_type_name(n, rule)
- int n;
- symbol_list *rule;
- {
- static char *msg = "invalid $ value";
- register int i;
- register symbol_list *rp;
- if (n < 0)
- fatal(msg);
- rp = rule;
- i = 0;
- while (i < n)
- {
- rp = rp->next;
- if (rp == NULL || rp->sym == NULL)
- fatal(msg);
- i++;
- }
- return (rp->sym->type_name);
- }
- /* 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 $0 with respect to the top of the stack,
- for the simple parser in which the stack is not popped until after the guard is run. */
- void
- copy_guard(rule, stack_offset)
- symbol_list *rule;
- int stack_offset;
- {
- register int c;
- register int n;
- register int count;
- register int match;
- register int ended;
- register char *type_name;
- int brace_flag = 0;
- int cplus_comment;
- /* offset is always 0 if parser has already popped the stack pointer */
- if (semantic_parser) stack_offset = 0;
- fprintf(fguard, "\ncase %d:\n", nrules);
- if (!nolinesflag)
- fprintf(fguard, "#line %d \"%s\"\n", lineno, infile);
- putc('{', fguard);
- count = 0;
- c = getc(finput);
- while (brace_flag ? (count > 0) : (c != ';'))
- {
- switch (c)
- {
- case '\n':
- putc(c, fguard);
- lineno++;
- break;
- case '{':
- putc(c, fguard);
- brace_flag = 1;
- count++;
- break;
- case '}':
- putc(c, fguard);
- if (count > 0)
- count--;
- else
- fatal("unmatched right brace ('}')");
- break;
- case '\'':
- case '"':
- match = c;
- putc(c, fguard);
- c = getc(finput);
- while (c != match)
- {
- if (c == EOF || c == '\n')
- fatal("unterminated string");
- putc(c, fguard);
-
- if (c == '\\')
- {
- c = getc(finput);
- if (c == EOF)
- fatal("unterminated string");
- putc(c, fguard);
- if (c == '\n')
- lineno++;
- }
- c = getc(finput);
- }
- putc(c, fguard);
- break;
- case '/':
- putc(c, fguard);
- c = getc(finput);
- if (c != '*' && c != '/')
- continue;
- cplus_comment = (c == '/');
- putc(c, fguard);
- c = getc(finput);
- ended = 0;
- while (!ended)
- {
- if (!cplus_comment && c == '*')
- {
- while (c == '*')
- {
- putc(c, fguard);
- c = getc(finput);
- }
- if (c == '/')
- {
- putc(c, fguard);
- ended = 1;
- }
- }
- else if (c == '\n')
- {
- lineno++;
- putc(c, fguard);
- if (cplus_comment)
- ended = 1;
- else
- c = getc(finput);
- }
- else if (c == EOF)
- fatal("unterminated comment");
- else
- {
- putc(c, fguard);
- c = getc(finput);
- }
- }
- break;
- case '$':
- c = getc(finput);
- type_name = NULL;
- if (c == '<')
- {
- register char *cp = token_buffer;
- while ((c = getc(finput)) != '>' && c > 0)
- *cp++ = c;
- *cp = 0;
- type_name = token_buffer;
- c = getc(finput);
- }
- if (c == '$')
- {
- fprintf(fguard, "yyval");
- if (!type_name) type_name = rule->sym->type_name;
- if (type_name)
- fprintf(fguard, ".%s", type_name);
- if(!type_name && typed) /* JF */
- fprintf(stderr,"%s:%d: warning: $$ of '%s' has no declared type.\n",infile,lineno,rule->sym->tag);
- }
- else if (isdigit(c) || c == '-')
- {
- ungetc (c, finput);
- n = read_signed_integer(finput);
- c = getc(finput);
- if (!type_name && n > 0)
- type_name = get_type_name(n, rule);
- fprintf(fguard, "yyvsp[%d]", n - stack_offset);
- if (type_name)
- fprintf(fguard, ".%s", type_name);
- if(!type_name && typed) /* JF */
- fprintf(stderr,"%s:%d: warning: $%d of '%s' has no declared type.\n",infile,lineno,n,rule->sym->tag);
- continue;
- }
- else
- fatals("$%c is invalid",c); /* JF changed style */
- break;
- case '@':
- c = getc(finput);
- if (isdigit(c) || c == '-')
- {
- ungetc (c, finput);
- n = read_signed_integer(finput);
- c = getc(finput);
- }
- else
- fatals("@%c is invalid",c); /* JF changed style */
- fprintf(fguard, "yylsp[%d]", n - stack_offset);
- yylsp_needed = 1;
- continue;
- case EOF:
- fatal("unterminated %guard clause");
- default:
- putc(c, fguard);
- }
- if (c != '}' || count != 0)
- c = getc(finput);
- }
- c = skip_white_space();
- fprintf(fguard, ";\n break;}");
- if (c == '{')
- copy_action(rule, stack_offset);
- else if (c == '=')
- {
- c = getc(finput);
- if (c == '{')
- copy_action(rule, stack_offset);
- }
- else
- ungetc(c, finput);
- }
- /* 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. */
- void
- copy_action(rule, stack_offset)
- symbol_list *rule;
- int stack_offset;
- {
- register int c;
- register int n;
- register int count;
- register int match;
- register int ended;
- register char *type_name;
- int cplus_comment;
- /* offset is always 0 if parser has already popped the stack pointer */
- if (semantic_parser) stack_offset = 0;
- fprintf(faction, "\ncase %d:\n", nrules);
- if (!nolinesflag)
- fprintf(faction, "#line %d \"%s\"\n", lineno, infile);
- putc('{', faction);
- count = 1;
- c = getc(finput);
- while (count > 0)
- {
- while (c != '}')
- {
- switch (c)
- {
- case '\n':
- putc(c, faction);
- lineno++;
- break;
- case '{':
- putc(c, faction);
- count++;
- break;
- case '\'':
- case '"':
- match = c;
- putc(c, faction);
- c = getc(finput);
- while (c != match)
- {
- if (c == EOF || c == '\n')
- fatal("unterminated string");
- putc(c, faction);
- if (c == '\\')
- {
- c = getc(finput);
- if (c == EOF)
- fatal("unterminated string");
- putc(c, faction);
- if (c == '\n')
- lineno++;
- }
- c = getc(finput);
- }
- putc(c, faction);
- break;
- case '/':
- putc(c, faction);
- c = getc(finput);
- if (c != '*' && c != '/')
- continue;
- cplus_comment = (c == '/');
- putc(c, faction);
- c = getc(finput);
- ended = 0;
- while (!ended)
- {
- if (!cplus_comment && c == '*')
- {
- while (c == '*')
- {
- putc(c, faction);
- c = getc(finput);
- }
- if (c == '/')
- {
- putc(c, faction);
- ended = 1;
- }
- }
- else if (c == '\n')
- {
- lineno++;
- putc(c, faction);
- if (cplus_comment)
- ended = 1;
- else
- c = getc(finput);
- }
- else if (c == EOF)
- fatal("unterminated comment");
- else
- {
- putc(c, faction);
- c = getc(finput);
- }
- }
- break;
- case '$':
- c = getc(finput);
- type_name = NULL;
- if (c == '<')
- {
- register char *cp = token_buffer;
- while ((c = getc(finput)) != '>' && c > 0)
- *cp++ = c;
- *cp = 0;
- type_name = token_buffer;
- value_components_used = 1;
- c = getc(finput);
- }
- if (c == '$')
- {
- fprintf(faction, "yyval");
- if (!type_name) type_name = get_type_name(0, rule);
- if (type_name)
- fprintf(faction, ".%s", type_name);
- if(!type_name && typed) /* JF */
- fprintf(stderr,"%s:%d: warning: $$ of '%s' has no declared type.\n",infile,lineno,rule->sym->tag);
- }
- else if (isdigit(c) || c == '-')
- {
- ungetc (c, finput);
- n = read_signed_integer(finput);
- c = getc(finput);
- if (!type_name && n > 0)
- type_name = get_type_name(n, rule);
- fprintf(faction, "yyvsp[%d]", n - stack_offset);
- if (type_name)
- fprintf(faction, ".%s", type_name);
- if(!type_name && typed) /* JF */
- fprintf(stderr,"%s:%d: warning: $%d of '%s' has no declared type.\n",infile,lineno,n,rule->sym->tag);
- continue;
- }
- else
- fatals("$%c is invalid",c); /* JF changed format */
- break;
- case '@':
- c = getc(finput);
- if (isdigit(c) || c == '-')
- {
- ungetc (c, finput);
- n = read_signed_integer(finput);
- c = getc(finput);
- }
- else
- fatal("invalid @-construct");
- fprintf(faction, "yylsp[%d]", n - stack_offset);
- yylsp_needed = 1;
- continue;
- case EOF:
- fatal("unmatched '{'");
- default:
- putc(c, faction);
- }
- c = getc(finput);
- }
- /* above loop exits when c is '}' */
- if (--count)
- {
- putc(c, faction);
- c = getc(finput);
- }
- }
- fprintf(faction, ";\n break;}");
- }
- /* generate a dummy symbol, a nonterminal,
- whose name cannot conflict with the user's names. */
- bucket *
- gensym()
- {
- register bucket *sym;
- sprintf (token_buffer, "@%d", ++gensym_count);
- sym = getsym(token_buffer);
- sym->class = SNTERM;
- sym->value = nvars++;
- return (sym);
- }
- /* 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. */
- void
- readgram()
- {
- register int t;
- register bucket *lhs;
- register symbol_list *p;
- register symbol_list *p1;
- register bucket *bp;
- symbol_list *crule; /* points to first symbol_list of current rule. */
- /* its symbol is the lhs of the rule. */
- symbol_list *crule1; /* points to the symbol_list preceding crule. */
- p1 = NULL;
- t = lex();
- while (t != TWO_PERCENTS && t != ENDFILE)
- {
- if (t == IDENTIFIER || t == BAR)
- {
- register int actionflag = 0;
- int rulelength = 0; /* number of symbols in rhs of this rule so far */
- int xactions = 0; /* JF for error checking */
- bucket *first_rhs = 0;
- if (t == IDENTIFIER)
- {
- lhs = symval;
-
- t = lex();
- if (t != COLON)
- fatal("ill-formed rule");
- }
- if (nrules == 0)
- {
- if (t == BAR)
- fatal("grammar starts with vertical bar");
- if (!start_flag)
- startval = lhs;
- }
- /* start a new rule and record its lhs. */
- nrules++;
- nitems++;
- record_rule_line ();
- p = NEW(symbol_list);
- 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 == SUNKNOWN)
- {
- lhs->class = SNTERM;
- lhs->value = nvars;
- nvars++;
- }
- else if (lhs->class == STOKEN)
- fatals("rule given for %s, which is a token", lhs->tag);
- /* read the rhs of the rule. */
- for (;;)
- {
- 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)
- {
- register bucket *ssave;
- register 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 (actionflag)
- {
- register bucket *sdummy;
- /* Since the action was written out with this rule's */
- /* number, we must write 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 = NEW(symbol_list);
- if (crule1)
- crule1->next = p;
- else grammar = p;
- p->sym = sdummy;
- crule1 = NEW(symbol_list);
- p->next = crule1;
- crule1->next = crule;
- /* insert the dummy generated by that rule into this rule. */
- nitems++;
- p = NEW(symbol_list);
- p->sym = sdummy;
- p1->next = p;
- p1 = p;
- actionflag = 0;
- }
- if (t == IDENTIFIER)
- {
- nitems++;
- p = NEW(symbol_list);
- p->sym = symval;
- p1->next = p;
- p1 = p;
- }
- else /* handle an action. */
- {
- copy_action(crule, rulelength);
- actionflag = 1;
- xactions++; /* JF */
- }
- rulelength++;
- }
- /* Put an empty link in the list to mark the end of this rule */
- p = NEW(symbol_list);
- p1->next = p;
- p1 = p;
- if (t == PREC)
- {
- t = lex();
- crule->ruleprec = symval;
- t = lex();
- }
- if (t == GUARD)
- {
- if (! semantic_parser)
- fatal("%guard present but %semantic_parser not specified");
- copy_guard(crule, rulelength);
- t = lex();
- }
- else if (t == LEFT_CURLY)
- {
- if (actionflag) fatal("two actions at end of one rule");
- copy_action(crule, rulelength);
- t = lex();
- }
- /* If $$ is being set in default way,
- warn if any type mismatch. */
- else if (!xactions && first_rhs && lhs->type_name != first_rhs->type_name)
- {
- if (lhs->type_name == 0 || first_rhs->type_name == 0
- || strcmp(lhs->type_name,first_rhs->type_name))
- fprintf(stderr, "%s:%d: warning: type clash ('%s' '%s') on default action\n",
- infile,
- lineno,
- lhs->type_name ? lhs->type_name : "",
- first_rhs->type_name ? first_rhs->type_name : "");
- }
- /* Warn if there is no default for $$ but we need one. */
- else if (!xactions && !first_rhs && lhs->type_name != 0)
- fprintf(stderr,
- "%s:%d: warning: empty rule for typed nonterminal, and no action\n",
- infile,
- lineno);
- if (t == SEMICOLON)
- t = lex();
- }
- /* these things can appear as alternatives to rules. */
- else if (t == TOKEN)
- {
- parse_token_decl(STOKEN, SNTERM);
- t = lex();
- }
- else if (t == NTERM)
- {
- parse_token_decl(SNTERM, STOKEN);
- 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();
- }
- else
- fatal("invalid input");
- }
- if (nsyms > MAXSHORT)
- fatals("too many symbols (tokens plus nonterminals); maximum %d",
- MAXSHORT);
- if (nrules == 0)
- fatal("no input grammar");
- if (typed == 0 /* JF put out same default YYSTYPE as YACC does */
- && !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. */
- fprintf(fattrs, "#ifndef YYSTYPE\n#define YYSTYPE int\n#endif\n");
- if (fdefines)
- fprintf(fdefines, "#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 == SUNKNOWN)
- {
- fprintf(stderr, "symbol %s used, not defined as token, and no rules for it\n",
- bp->tag);
- failure = 1;
- bp->class = SNTERM;
- bp->value = nvars++;
- }
- ntokens = nsyms - nvars;
- }
- void
- record_rule_line ()
- {
- /* Record each rule's source line number in rline table. */
- if (nrules >= rline_allocated)
- {
- rline_allocated = nrules * 2;
- rline = (short *) realloc (rline,
- rline_allocated * sizeof (short));
- if (rline == 0)
- {
- fprintf (stderr, "%s: memory exhausted\n", program_name);
- done (1);
- }
- }
- rline[nrules] = lineno;
- }
- /* read in a %type declaration and record its information for get_type_name to access */
- int
- get_type()
- {
- register int k;
- register int t;
- register char *name;
- t = lex();
- if (t != TYPENAME)
- fatal("ill-formed %type declaration");
- k = strlen(token_buffer);
- name = NEW2(k + 1, char);
- strcpy(name, 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
- fatals("type redeclaration for %s", symval->tag);
- break;
- default:
- return (t);
- }
- }
- }
- /* assign symbol numbers, and write definition of token names into fdefines.
- Set up vectors tags and sprec of names and precedences of symbols. */
- void
- packsymbols()
- {
- register bucket *bp;
- register int tokno = 1;
- register int i;
- register int last_user_token_number;
- /* int lossage = 0; JF set but not used */
- tags = NEW2(nsyms + 1, char *);
- tags[0] = "$";
- sprec = NEW2(nsyms, short);
- sassoc = NEW2(nsyms, short);
- max_user_token_number = 256;
- last_user_token_number = 256;
- for (bp = firstsymbol; bp; bp = bp->next)
- {
- if (bp->class == SNTERM)
- {
- bp->value += ntokens;
- }
- else
- {
- 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;
- bp->value = tokno++;
- }
- tags[bp->value] = bp->tag;
- sprec[bp->value] = bp->prec;
- sassoc[bp->value] = bp->assoc;
- }
- if (translations)
- {
- register int i;
- token_translations = NEW2(max_user_token_number+1, short);
- /* initialize all entries for literal tokens to 2,
- the internal token number for $illegal., which represents all invalid inputs. */
- for (i = 0; i <= max_user_token_number; i++)
- token_translations[i] = 2;
- }
- for (bp = firstsymbol; bp; bp = bp->next)
- {
- if (bp->value >= ntokens) continue;
- if (translations)
- {
- if (token_translations[bp->user_token_number] != 2)
- {
- /* JF made this a call to fatals() */
- fatals( "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;
- output_token_defines(ftable);
- if (startval->class == SUNKNOWN)
- fatals("the start symbol %s is undefined", startval->tag);
- else if (startval->class == STOKEN)
- fatals("the start symbol %s is a token", startval->tag);
- start_symbol = startval->value;
- if (definesflag)
- {
- output_token_defines(fdefines);
- if (!pure_parser)
- {
- if (spec_name_prefix)
- fprintf(fdefines, "\nextern YYSTYPE %slval;\n", spec_name_prefix);
- else
- fprintf(fdefines, "\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] != '@')
- fprintf(fdefines, "#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
- }
- }
-
- void
- output_token_defines(file)
- FILE *file;
- {
- bucket *bp;
- for (bp = firstsymbol; bp; bp = bp->next)
- {
- if (bp->value >= ntokens) continue;
- /* For named tokens, but not literal ones, define the name. */
- /* The value is the user token number. */
- if ('\'' != *tags[bp->value] && bp != errtoken)
- {
- register char *cp = tags[bp->value];
- register char c;
- /* Don't #define nonliteral tokens whose names contain periods. */
- while ((c = *cp++) && c != '.');
- if (!c)
- {
- fprintf(file, "#define\t%s\t%d\n", tags[bp->value],
- (translations ? bp->user_token_number : bp->value));
- if (semantic_parser)
- fprintf(file, "#define\tT%s\t%d\n", tags[bp->value],
- bp->value);
- }
- }
- }
- putc('\n', file);
- }
- /* convert the rules into the representation using rrhs, rlhs and ritems. */
- void
- packgram()
- {
- register int itemno;
- register int ruleno;
- register symbol_list *p;
- /* register bucket *bp; JF unused */
- bucket *ruleprec;
- ritem = NEW2(nitems + 1, short);
- rlhs = NEW2(nrules, short) - 1;
- rrhs = NEW2(nrules, short) - 1;
- rprec = NEW2(nrules, short) - 1;
- rprecsym = NEW2(nrules, short) - 1;
- rassoc = NEW2(nrules, short) - 1;
- itemno = 0;
- ruleno = 1;
- p = grammar;
- while (p)
- {
- rlhs[ruleno] = p->sym->value;
- rrhs[ruleno] = itemno;
- ruleprec = p->ruleprec;
- p = p->next;
- while (p && p->sym)
- {
- ritem[itemno++] = p->sym->value;
- /* A rule gets by default the precedence and associativity
- of the last token in it. */
- if (p->sym->class == STOKEN)
- {
- rprec[ruleno] = p->sym->prec;
- rassoc[ruleno] = p->sym->assoc;
- }
- if (p) p = p->next;
- }
- /* If this rule has a %prec,
- the specified symbol's precedence replaces the default. */
- if (ruleprec)
- {
- rprec[ruleno] = ruleprec->prec;
- rassoc[ruleno] = ruleprec->assoc;
- rprecsym[ruleno] = ruleprec->value;
- }
- ritem[itemno++] = -ruleno;
- ruleno++;
- if (p) p = p->next;
- }
- ritem[itemno] = 0;
- }
- /* Read a signed integer from STREAM and return its value. */
- int
- read_signed_integer (stream)
- FILE *stream;
- {
- register int c = getc(stream);
- register int sign = 1;
- register int n;
- if (c == '-')
- {
- c = getc(stream);
- sign = -1;
- }
- n = 0;
- while (isdigit(c))
- {
- n = 10*n + (c - '0');
- c = getc(stream);
- }
- ungetc(c, stream);
- return n * sign;
- }
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