X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/7333d403168b95318108cd572d228881c82ff341..f6ec6d13dcd3833254202659ada3541c9dab88a1:/src/reader.c diff --git a/src/reader.c b/src/reader.c index 93fe353c..9bf54dfb 100644 --- a/src/reader.c +++ b/src/reader.c @@ -26,14 +26,15 @@ #include "quote.h" #include "getargs.h" #include "files.h" -#include "xalloc.h" #include "symtab.h" +#include "options.h" #include "lex.h" #include "gram.h" #include "complain.h" #include "output.h" #include "reader.h" #include "conflicts.h" +#include "muscle_tab.h" /* Number of slots allocated (but not necessarily used yet) in `rline' */ static int rline_allocated; @@ -156,11 +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); @@ -192,9 +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 | @@ -403,9 +426,14 @@ 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)); + { + obstack_fgrow2 (&attrs_obstack, muscle_find ("linef"), + lineno, quotearg_style (c_quoting_style, + muscle_find("filename"))); + } +#endif after_percent = 0; @@ -462,8 +490,8 @@ copy_definition (void) static void parse_token_decl (symbol_class what_is, symbol_class what_is_not) { - token_t token = 0; - char *typename = 0; + token_t token = tok_undef; + char *typename = NULL; /* The symbol being defined. */ struct bucket *symbol = NULL; @@ -512,7 +540,6 @@ parse_token_decl (symbol_class what_is, symbol_class what_is_not) /* symbol and symval combined are only one symbol */ nsyms--; } - translations = 1; symbol = NULL; } else if (token == tok_identifier) @@ -537,7 +564,6 @@ parse_token_decl (symbol_class what_is, symbol_class what_is_not) else if (symbol && token == tok_number) { symbol->user_token_number = numval; - translations = 1; } else { @@ -679,7 +705,6 @@ parse_assoc_decl (associativity assoc) if (prev == tok_identifier) { symval->user_token_number = numval; - translations = 1; } else { @@ -706,9 +731,9 @@ token_buffer); /*--------------------------------------------------------------. -| 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. | +| Copy the union declaration into the stype muscle | +| (and fdefines), where it is made into the definition of | +| YYSTYPE, the type of elements of the parser value stack. | `--------------------------------------------------------------*/ static void @@ -716,19 +741,20 @@ parse_union_decl (void) { int c; int count = 0; + struct obstack union_obstack; 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 + /* FIXME: I'm worried: are you sure attrs_obstack is properly + filled? */ + if (no_lines_flag) obstack_1grow (&attrs_obstack, '\n'); - obstack_sgrow (&attrs_obstack, "typedef union"); + obstack_init (&union_obstack); + obstack_sgrow (&union_obstack, "union"); if (defines_flag) obstack_sgrow (&defines_obstack, "typedef union"); @@ -736,9 +762,13 @@ parse_union_decl (void) while (c != EOF) { - obstack_1grow (&attrs_obstack, c); - if (defines_flag) - obstack_1grow (&defines_obstack, c); + /* If C contains '/', it is output by copy_comment (). */ + if (c != '/') + { + obstack_1grow (&union_obstack, c); + if (defines_flag) + obstack_1grow (&defines_obstack, c); + } switch (c) { @@ -747,7 +777,7 @@ parse_union_decl (void) break; case '/': - copy_comment2 (finput, &defines_obstack, &attrs_obstack); + copy_comment2 (finput, &defines_obstack, &union_obstack); break; case '{': @@ -760,19 +790,21 @@ parse_union_decl (void) 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); + obstack_1grow (&union_obstack, 0); + muscle_insert ("stype", obstack_finish (&union_obstack)); return; } } c = getc (finput); } + } @@ -822,7 +854,6 @@ parse_thong_decl (void) char *typename = 0; int usrtoknum; - translations = 1; token = lex (); /* fetch typename or first token */ if (token == tok_typename) { @@ -874,44 +905,55 @@ parse_thong_decl (void) nsyms--; } -/*------------------------------------------. -| Parse what comes after %header_extension. | -`------------------------------------------*/ - static void -parse_header_extension_decl (void) +parse_muscle_decl (void) { - char buff[32]; - int len; - - if (header_extension) - complain (_("multiple %%header_extension declarations")); - fscanf (finput, "%s", buff); - printf("-> %s\n", buff); - len = strlen (buff); - buff[len] = '\0'; - src_extension = XMALLOC (char, len + 1); - stpcpy (header_extension, buff); + int ch = ungetc (skip_white_space (), finput); + char* muscle_key; + char* muscle_value; + + /* Read key. */ + if (!isalpha (ch) && ch != '_') + { + complain (_("invalid %s declaration"), "%define"); + skip_to_char ('%'); + return; + } + copy_identifier (finput, &muscle_obstack); + obstack_1grow (&muscle_obstack, 0); + muscle_key = obstack_finish (&muscle_obstack); + + /* Read value. */ + ch = skip_white_space (); + if (ch != '"') + { + ungetc (ch, finput); + if (ch != EOF) + { + complain (_("invalid %s declaration"), "%define"); + skip_to_char ('%'); + return; + } + else + fatal (_("Premature EOF after %s"), "\""); + } + copy_string2 (finput, &muscle_obstack, '"', 0); + obstack_1grow (&muscle_obstack, 0); + muscle_value = obstack_finish (&muscle_obstack); + + /* Store the (key, value) pair in the environment. */ + muscle_insert (muscle_key, muscle_value); } -/*------------------------------------------. -| Parse what comes after %source_extension. | -`------------------------------------------*/ -static void -parse_source_extension_decl (void) +/*----------------------------------. +| Parse what comes after %skeleton. | +`----------------------------------*/ + +void +parse_skel_decl (void) { - char buff[32]; - int len; - - if (src_extension) - complain (_("multiple %%source_extension declarations")); - fscanf (finput, "%s", buff); - printf("-> %s\n", buff); - len = strlen (buff); - buff[len] = '\0'; - src_extension = XMALLOC (char, len + 1); - stpcpy (src_extension, buff); + /* Complete with parse_dquoted_param () on the CVS branch 1.29. */ } /*----------------------------------------------------------------. @@ -983,11 +1025,12 @@ read_declarations (void) parse_assoc_decl (non_assoc); break; - case tok_hdrext: + case tok_define: + parse_muscle_decl (); break; - case tok_srcext: - parse_source_extension_decl(); + case tok_skel: + parse_skel_decl (); break; case tok_noop: @@ -1028,14 +1071,13 @@ copy_action (symbol_list *rule, int stack_offset) if (semantic_parser) stack_offset = 0; - sprintf (buf, "\ncase %d:\n", nrules); - obstack_grow (&action_obstack, buf, strlen (buf)); + obstack_fgrow1 (&action_obstack, "\ncase %d:\n", nrules); 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_fgrow2 (&action_obstack, muscle_find ("linef"), + lineno, quotearg_style (c_quoting_style, + muscle_find ("filename"))); } obstack_1grow (&action_obstack, '{'); @@ -1121,8 +1163,9 @@ copy_guard (symbol_list *rule, int stack_offset) 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_fgrow2 (&guard_obstack, muscle_find ("linef"), + lineno, quotearg_style (c_quoting_style, + muscle_find ("filename"))); obstack_1grow (&guard_obstack, '{'); count = 0; @@ -1573,22 +1616,6 @@ 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. */ - 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) @@ -1603,6 +1630,25 @@ 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); + muscle_insert ("epilogue", obstack_finish (&el_obstack)); +} + /*--------------------------------------------------------------. | For named tokens, but not literal ones, define the name. The | @@ -1643,14 +1689,13 @@ output_token_defines (struct obstack *oout) if (c != '\0') continue; - obstack_fgrow2 (oout, "#define\t%s\t%d\n", - symbol, - (translations ? bp->user_token_number : bp->value)); + obstack_fgrow2 (oout, "# define\t%s\t%d\n", + symbol, bp->user_token_number); if (semantic_parser) - obstack_fgrow2 (oout, "#define\tT%s\t%d\n", symbol, bp->value); + /* FIXME: This is certainly dead wrong, and should be just as + above. --akim. */ + obstack_fgrow2 (oout, "# define\tT%s\t%d\n", symbol, bp->value); } - - obstack_1grow (oout, '\n'); } @@ -1663,14 +1708,12 @@ output_token_defines (struct obstack *oout) static void packsymbols (void) { - bucket *bp; + bucket *bp = NULL; int tokno = 1; - int i; + int i, j; 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); @@ -1731,7 +1774,7 @@ packsymbols (void) if (bp->class == token_sym) { - if (translations && !(bp->user_token_number)) + if (!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; @@ -1741,39 +1784,44 @@ packsymbols (void) 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); + 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; + /* 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; - } + 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; + { + struct obstack tokendefs; + obstack_init (&tokendefs); + output_token_defines (&tokendefs); + obstack_1grow (&tokendefs, 0); + muscle_insert ("tokendef", xstrdup (obstack_finish (&tokendefs))); + obstack_free (&tokendefs, NULL); + } + +#if 0 if (!no_parser_flag) output_token_defines (&table_obstack); +#endif if (startval->class == unknown_sym) fatal (_("the start symbol %s is undefined"), startval->tag); @@ -1802,7 +1850,7 @@ 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 @@ -1893,15 +1941,6 @@ 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; @@ -1917,15 +1956,20 @@ reader (void) grammar = NULL; - init_lex (); + lex_init (); lineno = 1; + /* Initialize the muscle obstack. */ + obstack_init (&muscle_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."); @@ -1935,63 +1979,20 @@ 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. */ - 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 (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"); + write its type into the .tab.h file. + This is no longer need with header skeleton. */ + /* 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 (); -} - - -/*------------------------------------------------------------------. -| 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"); }