X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/131e2fef683836d45262423bbdf004a014335aba..4134cae3c5ff2fc3346ebc5b10d5c25c72c72cfe:/src/reader.c diff --git a/src/reader.c b/src/reader.c index cdacc071..49e5158e 100644 --- a/src/reader.c +++ b/src/reader.c @@ -1,5 +1,5 @@ /* Input parser for bison - Copyright (C) 1984, 1986, 1989, 1992, 1998, 2000 + Copyright 1984, 1986, 1989, 1992, 1998, 2000 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -21,6 +21,9 @@ #include "system.h" +#include "obstack.h" +#include "quotearg.h" +#include "quote.h" #include "getargs.h" #include "files.h" #include "xalloc.h" @@ -31,7 +34,7 @@ #include "output.h" #include "reader.h" #include "conflicts.h" -#include "quote.h" +#include "macrotab.h" /* Number of slots allocated (but not necessarily used yet) in `rline' */ static int rline_allocated; @@ -61,9 +64,6 @@ static int typed; /* Incremented for each %left, %right or %nonassoc seen */ static int lastprec; -/* Incremented for each generated symbol */ -static int gensym_count; - static bucket *errtoken; static bucket *undeftoken; @@ -151,17 +151,19 @@ get_type_name (int n, symbol_list * rule) return rp->sym->type_name; } -/*-------------------------------------------------------------------. -| Dump the string from FINPUT to FOUTPUT. MATCH is the delimiter of | -| the string (either ' or "). | -`-------------------------------------------------------------------*/ +/*------------------------------------------------------------. +| 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, FILE *fout, int match) +copy_string2 (FILE *fin, struct obstack *oout, int match, int store) { int c; - putc (match, fout); + if (store) + obstack_1grow (oout, match); + c = getc (fin); while (c != match) @@ -176,14 +178,15 @@ copy_string (FILE *fin, FILE *fout, int match) continue; } - putc (c, fout); + obstack_1grow (oout, c); if (c == '\\') { c = getc (fin); if (c == EOF) fatal (_("unterminated string at end of file")); - putc (c, fout); + obstack_1grow (oout, c); + if (c == '\n') lineno++; } @@ -191,27 +194,68 @@ copy_string (FILE *fin, FILE *fout, int match) c = getc (fin); } - putc (c, fout); + if (store) + obstack_1grow (oout, c); } +/* FIXME. */ -/*---------------------------------------------------------------. -| Dump the comment from IN to OUT1 and OUT2. C is either `*' or | -| `/', depending upon the type of comments used. OUT2 might be | -| NULL. | -`---------------------------------------------------------------*/ +static inline void +copy_string (FILE *fin, struct obstack *oout, int match) +{ + copy_string2 (fin, oout, match, 1); +} + +/* FIXME. */ static inline void -copy_comment2 (FILE *in, FILE *out1, FILE *out2, int c) +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 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. | +`-----------------------------------------------------------------*/ + +static inline void +copy_comment2 (FILE *fin, struct obstack *oout1, struct obstack *oout2) { int cplus_comment; int ended; + int c; - cplus_comment = (c == '/'); - putc (c, out1); - if (out2) - putc (c, out2); - c = getc (in); + /* We read a `/', output it. */ + obstack_1grow (oout1, '/'); + if (oout2) + obstack_1grow (oout2, '/'); + + 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) @@ -220,72 +264,72 @@ copy_comment2 (FILE *in, FILE *out1, FILE *out2, int c) { while (c == '*') { - putc (c, out1); - if (out2) - putc (c, out2); - c = getc (in); + obstack_1grow (oout1, c); + if (oout2) + obstack_1grow (oout2, c); + c = getc (fin); } if (c == '/') { - putc (c, out1); - if (out2) - putc (c, out2); + obstack_1grow (oout1, c); + if (oout2) + obstack_1grow (oout2, c); ended = 1; } } else if (c == '\n') { lineno++; - putc (c, out1); - if (out2) - putc (c, out2); + obstack_1grow (oout1, c); + if (oout2) + obstack_1grow (oout2, c); if (cplus_comment) ended = 1; else - c = getc (in); + c = getc (fin); } else if (c == EOF) fatal (_("unterminated comment")); else { - putc (c, out1); - if (out2) - putc (c, out2); - c = getc (in); + obstack_1grow (oout1, c); + if (oout2) + obstack_1grow (oout2, c); + c = getc (fin); } } } -/*------------------------------------------------------------. -| Dump the comment from FIN to FOUT. C is either `*' or `/', | -| depending upon the type of comments used. | -`------------------------------------------------------------*/ +/*-------------------------------------------------------------------. +| Dump the comment (actually the current string starting with a `/') | +| from FIN to OOUT. | +`-------------------------------------------------------------------*/ static inline void -copy_comment (FILE *fin, FILE *fout, int c) +copy_comment (FILE *fin, struct obstack *oout) { - copy_comment2 (fin, fout, NULL, c); + copy_comment2 (fin, oout, NULL); } /*-----------------------------------------------------------------. -| FIN is pointing to a location (i.e., a `@'). Output to FOUT a | +| 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 `$0' with | | respect to the top of the stack. | `-----------------------------------------------------------------*/ static inline void -copy_at (FILE *fin, FILE *fout, int stack_offset) +copy_at (FILE *fin, struct obstack *oout, int stack_offset) { int c; c = getc (fin); if (c == '$') { - fprintf (fout, "yyloc"); + obstack_sgrow (oout, "yyloc"); locations_flag = 1; } else if (isdigit (c) || c == '-') @@ -295,7 +339,7 @@ copy_at (FILE *fin, FILE *fout, int stack_offset) ungetc (c, fin); n = read_signed_integer (fin); - fprintf (fout, "yylsp[%d]", n - stack_offset); + obstack_fgrow1 (oout, "yylsp[%d]", n - stack_offset); locations_flag = 1; } else @@ -312,44 +356,35 @@ copy_at (FILE *fin, FILE *fout, int stack_offset) | | | Possible inputs: $[]($|integer) | | | -| Output to FOUT a reference to this semantic value. STACK_OFFSET is | +| 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 `$0' with respect to the top of the stack. | `-------------------------------------------------------------------*/ static inline void -copy_dollar (FILE *fin, FILE *fout, +copy_dollar (FILE *fin, struct obstack *oout, symbol_list *rule, int stack_offset) { int c = getc (fin); - char *type_name = NULL; + const char *type_name = NULL; - /* Get the typename if explicit. */ + /* Get the type name if explicit. */ if (c == '<') { - char *cp = token_buffer; - - while ((c = getc (fin)) != '>' && c > 0) - { - if (cp == token_buffer + maxtoken) - cp = grow_token_buffer (cp); - - *cp++ = c; - } - *cp = 0; + read_type_name (fin); type_name = token_buffer; value_components_used = 1; - c = getc (fin); } if (c == '$') { - fprintf (fout, "yyval"); + obstack_sgrow (oout, "yyval"); + if (!type_name) type_name = get_type_name (0, rule); if (type_name) - fprintf (fout, ".%s", type_name); + obstack_fgrow1 (oout, ".%s", type_name); if (!type_name && typed) complain (_("$$ of `%s' has no declared type"), rule->sym->tag); @@ -363,9 +398,10 @@ copy_dollar (FILE *fin, FILE *fout, if (!type_name && n > 0) type_name = get_type_name (n, rule); - fprintf (fout, "yyvsp[%d]", n - stack_offset); + obstack_fgrow1 (oout, "yyvsp[%d]", n - stack_offset); + if (type_name) - fprintf (fout, ".%s", type_name); + obstack_fgrow1 (oout, ".%s", type_name); if (!type_name && typed) complain (_("$%d of `%s' has no declared type"), n, rule->sym->tag); @@ -390,8 +426,11 @@ copy_definition (void) /* -1 while reading a character if prev char was %. */ int after_percent; +#if 0 if (!no_lines_flag) - fprintf (fattrs, "#line %d \"%s\"\n", lineno, infile); + obstack_fgrow2 (&attrs_obstack, "#line %d %s\n", + lineno, quotearg_style (c_quoting_style, infile)); +#endif after_percent = 0; @@ -402,7 +441,7 @@ copy_definition (void) switch (c) { case '\n': - putc (c, fattrs); + obstack_1grow (&attrs_obstack, c); lineno++; break; @@ -412,22 +451,18 @@ copy_definition (void) case '\'': case '"': - copy_string (finput, fattrs, c); + copy_string (finput, &attrs_obstack, c); break; case '/': - putc (c, fattrs); - c = getc (finput); - if (c != '*' && c != '/') - continue; - copy_comment (finput, fattrs, c); + copy_comment (finput, &attrs_obstack); break; case EOF: fatal ("%s", _("unterminated `%{' definition")); default: - putc (c, fattrs); + obstack_1grow (&attrs_obstack, c); } c = getc (finput); @@ -436,12 +471,10 @@ copy_definition (void) { if (c == '}') return; - putc ('%', fattrs); + obstack_1grow (&attrs_obstack, '%'); } after_percent = 0; - } - } @@ -454,32 +487,38 @@ copy_definition (void) static void parse_token_decl (symbol_class what_is, symbol_class what_is_not) { - int token = 0; + token_t token = 0; char *typename = 0; - struct bucket *symbol = NULL; /* pts to symbol being defined */ + /* 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); + /* `%' (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) + if (token == tok_comma) { symbol = NULL; continue; } - if (token == TYPENAME) + if (token == tok_typename) { typename = xstrdup (token_buffer); value_components_used = 1; symbol = NULL; } - else if (token == IDENTIFIER && *symval->tag == '\"' && symbol) + else if (token == tok_identifier && *symval->tag == '\"' && symbol) { if (symval->alias) warn (_("symbol `%s' used more than once as a literal string"), @@ -501,7 +540,7 @@ parse_token_decl (symbol_class what_is, symbol_class what_is_not) translations = 1; symbol = NULL; } - else if (token == IDENTIFIER) + else if (token == tok_identifier) { int oldclass = symval->class; symbol = symval; @@ -520,7 +559,7 @@ parse_token_decl (symbol_class what_is, symbol_class what_is_not) complain (_("type redeclaration for %s"), symbol->tag); } } - else if (symbol && token == NUMBER) + else if (symbol && token == tok_number) { symbol->user_token_number = numval; translations = 1; @@ -545,7 +584,7 @@ parse_start_decl (void) { if (start_flag) complain (_("multiple %s declarations"), "%start"); - if (lex () != IDENTIFIER) + if (lex () != tok_identifier) complain (_("invalid %s declaration"), "%start"); else { @@ -564,7 +603,7 @@ parse_type_decl (void) { char *name; - if (lex () != TYPENAME) + if (lex () != tok_typename) { complain ("%s", _("%type declaration has no ")); skip_to_char ('%'); @@ -575,7 +614,7 @@ parse_type_decl (void) for (;;) { - int t; + token_t t; int tmp_char = ungetc (skip_white_space (), finput); if (tmp_char == '%') @@ -588,11 +627,11 @@ parse_type_decl (void) switch (t) { - case COMMA: - case SEMICOLON: + case tok_comma: + case tok_semicolon: break; - case IDENTIFIER: + case tok_identifier: if (symval->type_name == NULL) symval->type_name = name; else if (strcmp (name, symval->type_name) != 0) @@ -625,7 +664,7 @@ parse_assoc_decl (associativity assoc) for (;;) { - int t; + token_t t; int tmp_char = ungetc (skip_white_space (), finput); if (tmp_char == '%') @@ -637,14 +676,14 @@ parse_assoc_decl (associativity assoc) switch (t) { - case TYPENAME: + case tok_typename: name = xstrdup (token_buffer); break; - case COMMA: + case tok_comma: break; - case IDENTIFIER: + case tok_identifier: if (symval->prec != 0) complain (_("redefining precedence of %s"), symval->tag); symval->prec = lastprec; @@ -661,8 +700,8 @@ parse_assoc_decl (associativity assoc) } break; - case NUMBER: - if (prev == IDENTIFIER) + case tok_number: + if (prev == tok_identifier) { symval->user_token_number = numval; translations = 1; @@ -676,7 +715,7 @@ token_buffer); } break; - case SEMICOLON: + case tok_semicolon: return; default: @@ -691,11 +730,11 @@ token_buffer); -/*-------------------------------------------------------------------. -| 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. | -`-------------------------------------------------------------------*/ +/*--------------------------------------------------------------. +| 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. | +`--------------------------------------------------------------*/ static void parse_union_decl (void) @@ -709,21 +748,23 @@ parse_union_decl (void) typed = 1; if (!no_lines_flag) - fprintf (fattrs, "\n#line %d \"%s\"\n", lineno, infile); + obstack_fgrow2 (&attrs_obstack, "\n#line %d %s\n", + lineno, quotearg_style (c_quoting_style, + macro_find("filename"))); else - fprintf (fattrs, "\n"); + obstack_1grow (&attrs_obstack, '\n'); - fprintf (fattrs, "typedef union"); - if (fdefines) - fprintf (fdefines, "typedef union"); + obstack_sgrow (&attrs_obstack, "typedef union"); + if (defines_flag) + obstack_sgrow (&defines_obstack, "typedef union"); c = getc (finput); while (c != EOF) { - putc (c, fattrs); - if (fdefines) - putc (c, fdefines); + obstack_1grow (&attrs_obstack, c); + if (defines_flag) + obstack_1grow (&defines_obstack, c); switch (c) { @@ -732,13 +773,9 @@ parse_union_decl (void) break; case '/': - c = getc (finput); - if (c != '*' && c != '/') - continue; - copy_comment2 (finput, fattrs, fdefines, c); + copy_comment2 (finput, &defines_obstack, &attrs_obstack); break; - case '{': count++; break; @@ -749,9 +786,9 @@ parse_union_decl (void) count--; if (count <= 0) { - fprintf (fattrs, " YYSTYPE;\n"); - if (fdefines) - fprintf (fdefines, " YYSTYPE;\n"); + 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 != ';') @@ -806,14 +843,14 @@ parse_expect_decl (void) static void parse_thong_decl (void) { - int token; + token_t token; struct bucket *symbol; char *typename = 0; int usrtoknum; translations = 1; token = lex (); /* fetch typename or first token */ - if (token == TYPENAME) + if (token == tok_typename) { typename = xstrdup (token_buffer); value_components_used = 1; @@ -822,7 +859,7 @@ parse_thong_decl (void) /* process first token */ - if (token != IDENTIFIER) + if (token != tok_identifier) { complain (_("unrecognized item %s, expected an identifier"), token_buffer); @@ -836,7 +873,7 @@ parse_thong_decl (void) token = lex (); /* get number or literal string */ - if (token == NUMBER) + if (token == tok_number) { usrtoknum = numval; token = lex (); /* okay, did number, now get literal */ @@ -846,7 +883,7 @@ parse_thong_decl (void) /* process literal string token */ - if (token != IDENTIFIER || *symval->tag != '\"') + if (token != tok_identifier || *symval->tag != '\"') { complain (_("expected string constant instead of %s"), token_buffer); skip_to_char ('%'); @@ -863,11 +900,93 @@ parse_thong_decl (void) nsyms--; } +/* FIXME. */ + +static void +parse_macro_decl (void) +{ + int ch = ungetc (skip_white_space (), finput); + char* macro_key; + char* macro_value; + + /* Read key. */ + if (!isalpha (ch) && ch != '_') + { + complain (_("invalid %s declaration"), "%define"); + skip_to_char ('%'); + return; + } + copy_identifier (finput, ¯o_obstack); + obstack_1grow (¯o_obstack, 0); + macro_key = obstack_finish (¯o_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, ¯o_obstack, '"', 0); + obstack_1grow (¯o_obstack, 0); + macro_value = obstack_finish (¯o_obstack); + + /* Store the (key, value) pair in the environment. */ + macro_insert (macro_key, macro_value); +} + + +/*----------------------------------. +| Parse what comes after %skeleton. | +`----------------------------------*/ + +void +parse_skel_decl (void) +{ + /* Complete with parse_dquoted_param () on the CVS branch 1.29. */ +} + +/*------------------------------------------. +| Parse what comes after %header_extension. | +`------------------------------------------*/ + +static void +parse_header_extension_decl (void) +{ + char buff[32]; + + if (header_extension) + complain (_("multiple %%header_extension declarations")); + fscanf (finput, "%s", buff); + header_extension = xstrdup (buff); +} + +/*------------------------------------------. +| Parse what comes after %source_extension. | +`------------------------------------------*/ + +static void +parse_source_extension_decl (void) +{ + char buff[32]; + + if (src_extension) + complain (_("multiple %%source_extension declarations")); + fscanf (finput, "%s", buff); + src_extension = xstrdup (buff); +} /*----------------------------------------------------------------. | Read from finput until `%%' is seen. Discard the `%%'. Handle | | any `%' declarations, and copy the contents of any `%{ ... %}' | -| groups to fattrs. | +| groups to ATTRS_OBSTACK. | `----------------------------------------------------------------*/ static void @@ -886,65 +1005,70 @@ read_declarations (void) switch (tok) { - case TWO_PERCENTS: + case tok_two_percents: return; - case PERCENT_LEFT_CURLY: + case tok_percent_left_curly: copy_definition (); break; - case TOKEN: + case tok_token: parse_token_decl (token_sym, nterm_sym); break; - case NTERM: + case tok_nterm: parse_token_decl (nterm_sym, token_sym); break; - case TYPE: + case tok_type: parse_type_decl (); break; - case START: + case tok_start: parse_start_decl (); break; - case UNION: + case tok_union: parse_union_decl (); break; - case EXPECT: + case tok_expect: parse_expect_decl (); break; - case THONG: + + case tok_thong: parse_thong_decl (); break; - case LEFT: + case tok_left: parse_assoc_decl (left_assoc); break; - case RIGHT: + case tok_right: parse_assoc_decl (right_assoc); break; - case NONASSOC: + case tok_nonassoc: parse_assoc_decl (non_assoc); break; - case SEMANTIC_PARSER: - if (semantic_parser == 0) - { - semantic_parser = 1; - open_extra_files (); - } + case tok_hdrext: + parse_header_extension_decl (); + break; + + case tok_srcext: + parse_source_extension_decl (); break; - case PURE_PARSER: - pure_parser = 1; + case tok_define: + parse_macro_decl (); + break; + + case tok_skel: + parse_skel_decl (); break; - case NOOP: + case tok_noop: break; default: @@ -976,15 +1100,23 @@ 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; - fprintf (faction, "\ncase %d:\n", nrules); + sprintf (buf, "\ncase %d:\n", nrules); + obstack_grow (&action_obstack, buf, strlen (buf)); + if (!no_lines_flag) - fprintf (faction, "#line %d \"%s\"\n", lineno, infile); - putc ('{', faction); + { + sprintf (buf, "#line %d %s\n", + lineno, quotearg_style (c_quoting_style, + macro_find ("filename"))); + obstack_grow (&action_obstack, buf, strlen (buf)); + } + obstack_1grow (&action_obstack, '{'); count = 1; c = getc (finput); @@ -996,41 +1128,39 @@ copy_action (symbol_list *rule, int stack_offset) switch (c) { case '\n': - putc (c, faction); + obstack_1grow (&action_obstack, c); lineno++; break; case '{': - putc (c, faction); + obstack_1grow (&action_obstack, c); count++; break; case '\'': case '"': - copy_string (finput, faction, c); + copy_string (finput, &action_obstack, c); break; case '/': - putc (c, faction); - c = getc (finput); - if (c != '*' && c != '/') - continue; - copy_comment (finput, faction, c); + copy_comment (finput, &action_obstack); break; case '$': - copy_dollar (finput, faction, rule, stack_offset); + copy_dollar (finput, &action_obstack, + rule, stack_offset); break; case '@': - copy_at (finput, faction, stack_offset); + copy_at (finput, &action_obstack, + stack_offset); break; case EOF: fatal (_("unmatched %s"), "`{'"); default: - putc (c, faction); + obstack_1grow (&action_obstack, c); } c = getc (finput); @@ -1040,12 +1170,12 @@ copy_action (symbol_list *rule, int stack_offset) if (--count) { - putc (c, faction); + obstack_1grow (&action_obstack, c); c = getc (finput); } } - fprintf (faction, ";\n break;}"); + obstack_sgrow (&action_obstack, ";\n break;}"); } /*-------------------------------------------------------------------. @@ -1068,10 +1198,12 @@ copy_guard (symbol_list *rule, int stack_offset) if (semantic_parser) stack_offset = 0; - fprintf (fguard, "\ncase %d:\n", nrules); + obstack_fgrow1 (&guard_obstack, "\ncase %d:\n", nrules); if (!no_lines_flag) - fprintf (fguard, "#line %d \"%s\"\n", lineno, infile); - putc ('{', fguard); + obstack_fgrow2 (&guard_obstack, "#line %d %s\n", + lineno, quotearg_style (c_quoting_style, + macro_find ("filename"))); + obstack_1grow (&guard_obstack, '{'); count = 0; c = getc (finput); @@ -1081,18 +1213,18 @@ copy_guard (symbol_list *rule, int stack_offset) switch (c) { case '\n': - putc (c, fguard); + obstack_1grow (&guard_obstack, c); lineno++; break; case '{': - putc (c, fguard); + obstack_1grow (&guard_obstack, c); brace_flag = 1; count++; break; case '}': - putc (c, fguard); + obstack_1grow (&guard_obstack, c); if (count > 0) count--; else @@ -1104,30 +1236,26 @@ copy_guard (symbol_list *rule, int stack_offset) case '\'': case '"': - copy_string (finput, fguard, c); + copy_string (finput, &guard_obstack, c); break; case '/': - putc (c, fguard); - c = getc (finput); - if (c != '*' && c != '/') - continue; - copy_comment (finput, fguard, c); + copy_comment (finput, &guard_obstack); break; case '$': - copy_dollar (finput, fguard, rule, stack_offset); + copy_dollar (finput, &guard_obstack, rule, stack_offset); break; case '@': - copy_at (finput, fguard, stack_offset); + copy_at (finput, &guard_obstack, stack_offset); break; case EOF: fatal ("%s", _("unterminated %guard clause")); default: - putc (c, fguard); + obstack_1grow (&guard_obstack, c); } if (c != '}' || count != 0) @@ -1136,7 +1264,7 @@ copy_guard (symbol_list *rule, int stack_offset) c = skip_white_space (); - fprintf (fguard, ";\n break;}"); + obstack_sgrow (&guard_obstack, ";\n break;}"); if (c == '{') copy_action (rule, stack_offset); else if (c == '=') @@ -1172,9 +1300,14 @@ record_rule_line (void) static bucket * gensym (void) { + /* Incremented for each generated symbol */ + static int gensym_count = 0; + static char buf[256]; + bucket *sym; - sprintf (token_buffer, "@%d", ++gensym_count); + sprintf (buf, "@%d", ++gensym_count); + token_buffer = buf; sym = getsym (token_buffer); sym->class = nterm_sym; sym->value = nvars++; @@ -1192,12 +1325,12 @@ static int get_type (void) { int k; - int t; + token_t token; char *name; - t = lex (); + token = lex (); - if (t != TYPENAME) + if (token != tok_typename) { complain (_("invalid %s declaration"), "%type"); return t; @@ -1207,17 +1340,17 @@ get_type (void) for (;;) { - t = lex (); + token = lex (); - switch (t) + switch (token) { - case SEMICOLON: + case tok_semicolon: return lex (); - case COMMA: + case tok_comma: break; - case IDENTIFIER: + case tok_identifier: if (symval->type_name == NULL) symval->type_name = name; else if (strcmp (name, symval->type_name) != 0) @@ -1226,7 +1359,7 @@ get_type (void) break; default: - return t; + return token; } } } @@ -1247,7 +1380,7 @@ get_type (void) static void readgram (void) { - int t; + token_t t; bucket *lhs = NULL; symbol_list *p; symbol_list *p1; @@ -1263,9 +1396,9 @@ readgram (void) t = lex (); - while (t != TWO_PERCENTS && t != ENDFILE) + while (t != tok_two_percents && t != tok_eof) { - if (t == IDENTIFIER || t == BAR) + if (t == tok_identifier || t == tok_bar) { int action_flag = 0; /* Number of symbols in rhs of this rule so far */ @@ -1273,7 +1406,7 @@ readgram (void) int xactions = 0; /* JF for error checking */ bucket *first_rhs = 0; - if (t == IDENTIFIER) + if (t == tok_identifier) { lhs = symval; @@ -1284,14 +1417,14 @@ readgram (void) } t = lex (); - if (t != COLON) + if (t != tok_colon) { complain (_("ill-formed rule: initial symbol not followed by colon")); unlex (t); } } - if (nrules == 0 && t == BAR) + if (nrules == 0 && t == tok_bar) { complain (_("grammar starts with vertical bar")); lhs = symval; /* BOGUS: use a random symval */ @@ -1331,28 +1464,28 @@ readgram (void) for (;;) { t = lex (); - if (t == PREC) + if (t == tok_prec) { t = lex (); crule->ruleprec = symval; t = lex (); } - if (!(t == IDENTIFIER || t == LEFT_CURLY)) + 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 == IDENTIFIER) + if (t == tok_identifier) { bucket *ssave; - int t1; + token_t t1; ssave = symval; t1 = lex (); unlex (t1); symval = ssave; - if (t1 == COLON) + if (t1 == tok_colon) break; if (!first_rhs) /* JF */ @@ -1368,9 +1501,9 @@ readgram (void) { 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. */ + /* 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 (); @@ -1391,7 +1524,8 @@ readgram (void) p->next = crule1; crule1->next = crule; - /* insert the dummy generated by that rule into this rule. */ + /* Insert the dummy generated by that rule into this + rule. */ nitems++; p = XCALLOC (symbol_list, 1); p->sym = sdummy; @@ -1401,7 +1535,7 @@ readgram (void) action_flag = 0; } - if (t == IDENTIFIER) + if (t == tok_identifier) { nitems++; p = XCALLOC (symbol_list, 1); @@ -1423,14 +1557,14 @@ readgram (void) p1->next = p; p1 = p; - if (t == PREC) + if (t == tok_prec) { complain (_("two @prec's in a row")); t = lex (); crule->ruleprec = symval; t = lex (); } - if (t == GUARD) + if (t == tok_guard) { if (!semantic_parser) complain (_("%%guard present but %%semantic_parser not specified")); @@ -1438,7 +1572,7 @@ readgram (void) copy_guard (crule, rulelength); t = lex (); } - else if (t == LEFT_CURLY) + else if (t == tok_left_curly) { /* This case never occurs -wjh */ if (action_flag) @@ -1463,7 +1597,7 @@ readgram (void) /* 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) + if (t == tok_semicolon) t = lex (); } #if 0 @@ -1473,31 +1607,31 @@ readgram (void) b) most of them scan forward until finding a next % thus they may swallow lots of intervening rules */ - else if (t == TOKEN) + else if (t == tok_token) { parse_token_decl (token_sym, nterm_sym); t = lex (); } - else if (t == NTERM) + else if (t == tok_nterm) { parse_token_decl (nterm_sym, token_sym); t = lex (); } - else if (t == TYPE) + else if (t == tok_type) { t = get_type (); } - else if (t == UNION) + else if (t == tok_union) { parse_union_decl (); t = lex (); } - else if (t == EXPECT) + else if (t == tok_expect) { parse_expect_decl (); t = lex (); } - else if (t == START) + else if (t == tok_start) { parse_start_decl (); t = lex (); @@ -1506,7 +1640,7 @@ readgram (void) else { - complain (_("invalid input: %s"), token_buffer); + complain (_("invalid input: %s"), quote (token_buffer)); t = lex (); } } @@ -1519,18 +1653,6 @@ readgram (void) 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. */ - 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) @@ -1545,6 +1667,25 @@ readgram (void) ntokens = nsyms - nvars; } + +/* 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) +{ + char c; + struct obstack el_obstack; + + obstack_init (&el_obstack); + + while ((c = getc (finput)) != EOF) + obstack_1grow (&el_obstack, c); + + obstack_1grow (&el_obstack, 0); + macro_insert ("epilogue", obstack_finish (&el_obstack)); +} + /*--------------------------------------------------------------. | For named tokens, but not literal ones, define the name. The | @@ -1552,7 +1693,7 @@ readgram (void) `--------------------------------------------------------------*/ static void -output_token_defines (FILE *file) +output_token_defines (struct obstack *oout) { bucket *bp; char *cp, *symbol; @@ -1585,14 +1726,12 @@ output_token_defines (FILE *file) if (c != '\0') continue; - fprintf (file, "#define\t%s\t%d\n", symbol, - ((translations && !raw_flag) - ? bp->user_token_number : bp->value)); + obstack_fgrow2 (oout, "# define\t%s\t%d\n", + symbol, + (translations ? bp->user_token_number : bp->value)); if (semantic_parser) - fprintf (file, "#define\tT%s\t%d\n", symbol, bp->value); + obstack_fgrow2 (oout, "# define\tT%s\t%d\n", symbol, bp->value); } - - putc ('\n', file); } @@ -1611,8 +1750,6 @@ packsymbols (void) 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); @@ -1714,8 +1851,14 @@ packsymbols (void) error_token_number = errtoken->value; + output_token_defines (&output_obstack); + obstack_1grow (&output_obstack, 0); + macro_insert ("tokendef", obstack_finish (&output_obstack)); + +#if 0 if (!no_parser_flag) - output_token_defines (ftable); + output_token_defines (&table_obstack); +#endif if (startval->class == unknown_sym) fatal (_("the start symbol %s is undefined"), startval->tag); @@ -1726,15 +1869,16 @@ packsymbols (void) if (defines_flag) { - output_token_defines (fdefines); + output_token_defines (&defines_obstack); if (!pure_parser) { if (spec_name_prefix) - fprintf (fdefines, "\nextern YYSTYPE %slval;\n", - spec_name_prefix); + obstack_fgrow1 (&defines_obstack, "\nextern YYSTYPE %slval;\n", + spec_name_prefix); else - fprintf (fdefines, "\nextern YYSTYPE yylval;\n"); + obstack_sgrow (&defines_obstack, + "\nextern YYSTYPE yylval;\n"); } if (semantic_parser) @@ -1742,7 +1886,8 @@ packsymbols (void) { /* don't make these for dummy nonterminals made by gensym. */ if (*tags[i] != '@') - fprintf (fdefines, "#define\tNT%s\t%d\n", tags[i], 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 @@ -1821,10 +1966,10 @@ packgram (void) /*-------------------------------------------------------------------. | 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. | +| 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. | `-------------------------------------------------------------------*/ void @@ -1852,8 +1997,6 @@ reader (void) typed = 0; lastprec = 0; - gensym_count = 0; - semantic_parser = 0; pure_parser = 0; @@ -1862,42 +2005,38 @@ reader (void) init_lex (); lineno = 1; + /* Initialize the macro obstack. */ + obstack_init (¯o_obstack); + /* 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. */ + /* 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 FTABLE - and FDEFINES file. Also notice any %token, %left, etc. found - there. */ - putc ('\n', ftable); - fprintf (ftable, "\ -/* %s, made from %s\n\ - by GNU bison %s. */\n\ -\n", no_parser_flag ? "Bison-generated parse tables" : "A Bison parser", infile, VERSION); - - fputs ("#define YYBISON 1 /* Identify Bison output. */\n\n", ftable); + /* Read the declaration section. Copy %{ ... %} groups to + TABLE_OBSTACK and FDEFINES file. Also notice any %token, %left, + etc. found there. */ 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 (); + /* Some C code is given at the end of the grammar file. */ + read_additionnal_code (); /* Now we know whether we need the line-number stack. If we do, write its type into the .tab.h file. */ - if (fdefines) - reader_output_yylsp (fdefines); - /* Write closing delimiters for actions and guards. */ - output_trailers (); - if (locations_flag) - fputs ("#define YYLSP_NEEDED\n\n", ftable); +#if 0 + if (defines_flag) + reader_output_yylsp (&defines_obstack); +#endif /* Assign the symbols their symbol numbers. Write #defines for the token symbols into FDEFINES if requested. */ packsymbols (); @@ -1907,28 +2046,3 @@ reader (void) referred to by symbol number. */ free_symtab (); } - - -void -reader_output_yylsp (FILE *f) -{ - if (locations_flag) - fputs ("\ -\n\ -#ifndef YYLTYPE\n\ -typedef 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\ -} yyltype;\n\ -\n\ -# define YYLTYPE yyltype\n\ -#endif\n\ -\n", - f); -}