X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/f17bcd1f66dab24135ca3352491ac8fa4385fe37..2ba3b73c587f277f726724af09b2db62932552f8:/src/reader.c diff --git a/src/reader.c b/src/reader.c index e073f028..d7145da7 100644 --- a/src/reader.c +++ b/src/reader.c @@ -34,6 +34,7 @@ #include "output.h" #include "reader.h" #include "conflicts.h" +#include "macrotab.h" /* Number of slots allocated (but not necessarily used yet) in `rline' */ static int rline_allocated; @@ -63,9 +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; @@ -159,11 +157,12 @@ get_type_name (int n, symbol_list * rule) `------------------------------------------------------------*/ static inline void -copy_string (FILE *fin, struct obstack *oout, int match) +copy_string2 (FILE *fin, struct obstack *oout, int match, int store) { int c; - obstack_1grow (oout, match); + if (store) + obstack_1grow (oout, match); c = getc (fin); @@ -195,9 +194,30 @@ copy_string (FILE *fin, struct obstack *oout, int match) c = getc (fin); } - obstack_1grow (oout, c); + if (store) + obstack_1grow (oout, c); } +/* FIXME. */ + +static inline void +copy_string (FILE *fin, struct obstack *oout, int match) +{ + copy_string2 (fin, oout, match, 1); +} + +/* FIXME. */ + +static inline void +copy_identifier (FILE *fin, struct obstack *oout) +{ + int c; + + while (isalnum (c = getc (fin)) || c == '_') + obstack_1grow (oout, c); + + ungetc (c, fin); +} /*-----------------------------------------------------------------. | Dump the wannabee comment from IN to OUT1 and OUT2 (which can be | @@ -315,7 +335,6 @@ copy_at (FILE *fin, struct obstack *oout, int stack_offset) else if (isdigit (c) || c == '-') { int n; - char buf[4096]; ungetc (c, fin); n = read_signed_integer (fin); @@ -347,7 +366,7 @@ 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 type name if explicit. */ if (c == '<') @@ -407,9 +426,11 @@ copy_definition (void) /* -1 while reading a character if prev char was %. */ int after_percent; +#if 0 if (!no_lines_flag) obstack_fgrow2 (&attrs_obstack, "#line %d %s\n", lineno, quotearg_style (c_quoting_style, infile)); +#endif after_percent = 0; @@ -878,6 +899,88 @@ 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 | @@ -948,6 +1051,22 @@ read_declarations (void) parse_assoc_decl (non_assoc); break; + case tok_hdrext: + parse_header_extension_decl (); + break; + + case tok_srcext: + parse_source_extension_decl (); + break; + + case tok_define: + parse_macro_decl (); + break; + + case tok_skel: + parse_skel_decl (); + break; + case tok_noop: break; @@ -1178,9 +1297,14 @@ 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++; @@ -1513,7 +1637,7 @@ readgram (void) else { - complain (_("invalid input: %s"), token_buffer); + complain (_("invalid input: %s"), quote (token_buffer)); t = lex (); } } @@ -1526,6 +1650,7 @@ readgram (void) if (nrules == 0) fatal (_("no rules in the input grammar")); +#if 0 /* This code is in the skeleton now. */ /* JF put out same default YYSTYPE as YACC does */ if (typed == 0 && !value_components_used) @@ -1537,10 +1662,11 @@ readgram (void) "#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"); +# ifndef YYSTYPE\n\ +# define YYSTYPE int\n\ +# endif\n"); } +#endif /* Report any undefined symbols and consider them nonterminals. */ @@ -1556,6 +1682,25 @@ 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 user_code + directive. */ +static void +read_additionnal_code (void) +{ + char c; + struct obstack uc_obstack; + + obstack_init (&uc_obstack); + + while ((c = getc (finput)) != EOF) + obstack_1grow (&uc_obstack, c); + + obstack_1grow (&uc_obstack, 0); + macro_insert ("user_code", obstack_finish (&uc_obstack)); +} + /*--------------------------------------------------------------. | For named tokens, but not literal ones, define the name. The | @@ -1596,15 +1741,14 @@ output_token_defines (struct obstack *oout) if (c != '\0') continue; - obstack_fgrow2 (oout, "#define\t%s\t%d\n", + obstack_fgrow2 (oout, "# define\t%s\t%d\n", symbol, - ((translations && !raw_flag) - ? bp->user_token_number : bp->value)); + (translations ? bp->user_token_number : bp->value)); if (semantic_parser) - obstack_fgrow2 (oout, "#define\tT%s\t%d\n", symbol, bp->value); + obstack_fgrow2 (oout, "# define\tT%s\t%d\n", symbol, bp->value); } - obstack_1grow (oout, '\n'); + /* obstack_1grow (oout, '\n'); */ } @@ -1726,8 +1870,12 @@ packsymbols (void) error_token_number = errtoken->value; - if (!no_parser_flag) - output_token_defines (&table_obstack); + output_token_defines (&output_obstack); + obstack_1grow (&output_obstack, 0); + macro_insert ("tokendef", obstack_finish (&output_obstack)); + + /* if (!no_parser_flag) + output_token_defines (&table_obstack); */ if (startval->class == unknown_sym) fatal (_("the start symbol %s is undefined"), startval->tag); @@ -1756,7 +1904,7 @@ packsymbols (void) /* 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); + "# define\tNT%s\t%d\n", tags[i], i); } #if 0 /* `fdefines' is now a temporary file, so we need to copy its @@ -1866,8 +2014,6 @@ reader (void) typed = 0; lastprec = 0; - gensym_count = 0; - semantic_parser = 0; pure_parser = 0; @@ -1876,12 +2022,17 @@ 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."); @@ -1891,30 +2042,28 @@ reader (void) /* 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. */ +#if 0 output_headers (); +#endif /* 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 0 if (defines_flag) reader_output_yylsp (&defines_obstack); +#endif /* Write closing delimiters for actions and guards. */ - output_trailers (); +#if 0 + output_trailers (); if (locations_flag) obstack_sgrow (&table_obstack, "#define YYLSP_NEEDED 1\n\n"); +#endif /* Assign the symbols their symbol numbers. Write #defines for the token symbols into FDEFINES if requested. */ packsymbols (); @@ -1924,30 +2073,3 @@ reader (void) 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"); -}