/* $OpenBSD: output.c,v 1.26 2016/09/21 16:26:30 otto Exp $ */ /* $NetBSD: output.c,v 1.4 1996/03/19 03:21:41 jtc Exp $ */ /* * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Robert Paul Corbett. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "defs.h" static int nvectors; static int nentries; static short **froms; static short **tos; static short *tally; static short *width; static short *state_count; static short *order; static short *base; static short *pos; static int maxtable; static short *table; static short *check; static int lowzero; static int high; void output_prefix(void); void output_rule_data(void); void output_yydefred(void); void output_actions(void); void token_actions(void); void goto_actions(void); int default_goto(int); void save_column(int, int); void sort_actions(void); void pack_table(void); int matching_vector(int); int pack_vector(int); void output_base(void); void output_table(void); void output_check(void); int is_C_identifier(char *); void output_defines(void); void output_stored_text(void); void output_debug(void); void output_stype(void); void output_trailing_text(void); void output_semantic_actions(void); void free_itemsets(void); void free_shifts(void); void free_reductions(void); void output(void) { free_itemsets(); free_shifts(); free_reductions(); output_prefix(); output_stored_text(); output_defines(); output_rule_data(); output_yydefred(); output_actions(); free_parser(); output_debug(); output_stype(); if (rflag) write_section(tables); write_section(header); output_trailing_text(); write_section(body); output_semantic_actions(); write_section(trailer); } void output_prefix(void) { if (symbol_prefix == NULL) symbol_prefix = "yy"; else { ++outline; fprintf(code_file, "#define yyparse %sparse\n", symbol_prefix); ++outline; fprintf(code_file, "#define yylex %slex\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyerror %serror\n", symbol_prefix); ++outline; fprintf(code_file, "#define yychar %schar\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyval %sval\n", symbol_prefix); ++outline; fprintf(code_file, "#define yylval %slval\n", symbol_prefix); ++outline; fprintf(code_file, "#define yydebug %sdebug\n", symbol_prefix); ++outline; fprintf(code_file, "#define yynerrs %snerrs\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyerrflag %serrflag\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyss %sss\n", symbol_prefix); ++outline; fprintf(code_file, "#define yysslim %ssslim\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyssp %sssp\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyvs %svs\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyvsp %svsp\n", symbol_prefix); ++outline; fprintf(code_file, "#define yystacksize %sstacksize\n", symbol_prefix); ++outline; fprintf(code_file, "#define yylhs %slhs\n", symbol_prefix); ++outline; fprintf(code_file, "#define yylen %slen\n", symbol_prefix); ++outline; fprintf(code_file, "#define yydefred %sdefred\n", symbol_prefix); ++outline; fprintf(code_file, "#define yydgoto %sdgoto\n", symbol_prefix); ++outline; fprintf(code_file, "#define yysindex %ssindex\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyrindex %srindex\n", symbol_prefix); ++outline; fprintf(code_file, "#define yygindex %sgindex\n", symbol_prefix); ++outline; fprintf(code_file, "#define yytable %stable\n", symbol_prefix); ++outline; fprintf(code_file, "#define yycheck %scheck\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyname %sname\n", symbol_prefix); ++outline; fprintf(code_file, "#define yyrule %srule\n", symbol_prefix); } ++outline; fprintf(code_file, "#define YYPREFIX \"%s\"\n", symbol_prefix); } void output_rule_data(void) { int i; int j; fprintf(output_file, "const short %slhs[] =\n" "\t{%42d,", symbol_prefix, symbol_value[start_symbol]); j = 10; for (i = 3; i < nrules; i++) { if (j >= 10) { if (!rflag) ++outline; putc('\n', output_file); j = 1; } else ++j; fprintf(output_file, "%5d,", symbol_value[rlhs[i]]); } if (!rflag) outline += 2; fprintf(output_file, "\n};\n"); fprintf(output_file, "const short %slen[] =\n" "\t{%42d,", symbol_prefix, 2); j = 10; for (i = 3; i < nrules; i++) { if (j >= 10) { if (!rflag) ++outline; putc('\n', output_file); j = 1; } else j++; fprintf(output_file, "%5d,", rrhs[i + 1] - rrhs[i] - 1); } if (!rflag) outline += 2; fprintf(output_file, "\n};\n"); } void output_yydefred(void) { int i, j; fprintf(output_file, "const short %sdefred[] =\n" "\t{%39d,", symbol_prefix, (defred[0] ? defred[0] - 2 : 0)); j = 10; for (i = 1; i < nstates; i++) { if (j < 10) ++j; else { if (!rflag) ++outline; putc('\n', output_file); j = 1; } fprintf(output_file, "%5d,", (defred[i] ? defred[i] - 2 : 0)); } if (!rflag) outline += 2; fprintf(output_file, "\n};\n"); } void output_actions(void) { nvectors = 2 * nstates + nvars; froms = NEW2(nvectors, short *); tos = NEW2(nvectors, short *); tally = NEW2(nvectors, short); width = NEW2(nvectors, short); token_actions(); free(lookaheads); free(LA); free(LAruleno); free(accessing_symbol); goto_actions(); free(goto_map + ntokens); free(from_state); free(to_state); sort_actions(); pack_table(); output_base(); output_table(); output_check(); } void token_actions(void) { int i, j; int shiftcount, reducecount; int max, min; short *actionrow, *r, *s; action *p; actionrow = NEW2(2*ntokens, short); for (i = 0; i < nstates; ++i) { if (parser[i]) { for (j = 0; j < 2 * ntokens; ++j) actionrow[j] = 0; shiftcount = 0; reducecount = 0; for (p = parser[i]; p; p = p->next) { if (p->suppressed == 0) { if (p->action_code == SHIFT) { ++shiftcount; actionrow[p->symbol] = p->number; } else if (p->action_code == REDUCE && p->number != defred[i]) { ++reducecount; actionrow[p->symbol + ntokens] = p->number; } } } tally[i] = shiftcount; tally[nstates+i] = reducecount; width[i] = 0; width[nstates+i] = 0; if (shiftcount > 0) { froms[i] = r = NEW2(shiftcount, short); tos[i] = s = NEW2(shiftcount, short); min = MAXSHORT; max = 0; for (j = 0; j < ntokens; ++j) { if (actionrow[j]) { if (min > symbol_value[j]) min = symbol_value[j]; if (max < symbol_value[j]) max = symbol_value[j]; *r++ = symbol_value[j]; *s++ = actionrow[j]; } } width[i] = max - min + 1; } if (reducecount > 0) { froms[nstates+i] = r = NEW2(reducecount, short); tos[nstates+i] = s = NEW2(reducecount, short); min = MAXSHORT; max = 0; for (j = 0; j < ntokens; ++j) { if (actionrow[ntokens+j]) { if (min > symbol_value[j]) min = symbol_value[j]; if (max < symbol_value[j]) max = symbol_value[j]; *r++ = symbol_value[j]; *s++ = actionrow[ntokens+j] - 2; } } width[nstates+i] = max - min + 1; } } } free(actionrow); } void goto_actions(void) { int i, j, k; state_count = NEW2(nstates, short); k = default_goto(start_symbol + 1); fprintf(output_file, "const short %sdgoto[] =\n" "\t{%40d,", symbol_prefix, k); save_column(start_symbol + 1, k); j = 10; for (i = start_symbol + 2; i < nsyms; i++) { if (j >= 10) { if (!rflag) ++outline; putc('\n', output_file); j = 1; } else ++j; k = default_goto(i); fprintf(output_file, "%5d,", k); save_column(i, k); } if (!rflag) outline += 2; fprintf(output_file, "\n};\n"); free(state_count); } int default_goto(int symbol) { int i; int m; int n; int default_state; int max; m = goto_map[symbol]; n = goto_map[symbol + 1]; if (m == n) return (0); memset(state_count, 0, nstates * sizeof(short)); for (i = m; i < n; i++) state_count[to_state[i]]++; max = 0; default_state = 0; for (i = 0; i < nstates; i++) { if (state_count[i] > max) { max = state_count[i]; default_state = i; } } return (default_state); } void save_column(int symbol, int default_state) { int i; int m; int n; short *sp; short *sp1; short *sp2; int count; int symno; m = goto_map[symbol]; n = goto_map[symbol + 1]; count = 0; for (i = m; i < n; i++) { if (to_state[i] != default_state) ++count; } if (count == 0) return; symno = symbol_value[symbol] + 2*nstates; froms[symno] = sp1 = sp = NEW2(count, short); tos[symno] = sp2 = NEW2(count, short); for (i = m; i < n; i++) { if (to_state[i] != default_state) { *sp1++ = from_state[i]; *sp2++ = to_state[i]; } } tally[symno] = count; width[symno] = sp1[-1] - sp[0] + 1; } void sort_actions(void) { int i; int j; int k; int t; int w; order = NEW2(nvectors, short); nentries = 0; for (i = 0; i < nvectors; i++) { if (tally[i] > 0) { t = tally[i]; w = width[i]; j = nentries - 1; while (j >= 0 && (width[order[j]] < w)) j--; while (j >= 0 && (width[order[j]] == w) && (tally[order[j]] < t)) j--; for (k = nentries - 1; k > j; k--) order[k + 1] = order[k]; order[j + 1] = i; nentries++; } } } void pack_table(void) { int i; int place; int state; base = NEW2(nvectors, short); pos = NEW2(nentries, short); maxtable = 1000; table = NEW2(maxtable, short); check = NEW2(maxtable, short); lowzero = 0; high = 0; for (i = 0; i < maxtable; i++) check[i] = -1; for (i = 0; i < nentries; i++) { state = matching_vector(i); if (state < 0) place = pack_vector(i); else place = base[state]; pos[i] = place; base[order[i]] = place; } for (i = 0; i < nvectors; i++) { free(froms[i]); free(tos[i]); } free(froms); free(tos); free(pos); } /* The function matching_vector determines if the vector specified by */ /* the input parameter matches a previously considered vector. The */ /* test at the start of the function checks if the vector represents */ /* a row of shifts over terminal symbols or a row of reductions, or a */ /* column of shifts over a nonterminal symbol. Berkeley Yacc does not */ /* check if a column of shifts over a nonterminal symbols matches a */ /* previously considered vector. Because of the nature of LR parsing */ /* tables, no two columns can match. Therefore, the only possible */ /* match would be between a row and a column. Such matches are */ /* unlikely. Therefore, to save time, no attempt is made to see if a */ /* column matches a previously considered vector. */ /* */ /* Matching_vector is poorly designed. The test could easily be made */ /* faster. Also, it depends on the vectors being in a specific */ /* order. */ int matching_vector(int vector) { int i, j, k, t, w, match, prev; i = order[vector]; if (i >= 2*nstates) return (-1); t = tally[i]; w = width[i]; for (prev = vector - 1; prev >= 0; prev--) { j = order[prev]; if (width[j] != w || tally[j] != t) return (-1); match = 1; for (k = 0; match && k < t; k++) { if (tos[j][k] != tos[i][k] || froms[j][k] != froms[i][k]) match = 0; } if (match) return (j); } return (-1); } int pack_vector(int vector) { int i, j, k, l; int t, loc, ok; short *from, *to; int newmax; i = order[vector]; t = tally[i]; assert(t); from = froms[i]; to = tos[i]; j = lowzero - from[0]; for (k = 1; k < t; ++k) if (lowzero - from[k] > j) j = lowzero - from[k]; for (;; ++j) { if (j == 0) continue; ok = 1; for (k = 0; ok && k < t; k++) { loc = j + from[k]; if (loc >= maxtable) { if (loc >= MAXTABLE) fatal("maximum table size exceeded"); newmax = maxtable; do { newmax += 200; } while (newmax <= loc); table = realloc(table, newmax * sizeof(short)); if (table == NULL) no_space(); check = realloc(check, newmax * sizeof(short)); if (check == NULL) no_space(); for (l = maxtable; l < newmax; ++l) { table[l] = 0; check[l] = -1; } maxtable = newmax; } if (check[loc] != -1) ok = 0; } for (k = 0; ok && k < vector; k++) { if (pos[k] == j) ok = 0; } if (ok) { for (k = 0; k < t; k++) { loc = j + from[k]; table[loc] = to[k]; check[loc] = from[k]; if (loc > high) high = loc; } while (lowzero < maxtable && check[lowzero] != -1) ++lowzero; return (j); } } } void output_base(void) { int i, j; fprintf(output_file, "const short %ssindex[] =\n" "\t{%39d,", symbol_prefix, base[0]); j = 10; for (i = 1; i < nstates; i++) { if (j >= 10) { if (!rflag) ++outline; putc('\n', output_file); j = 1; } else ++j; fprintf(output_file, "%5d,", base[i]); } if (!rflag) outline += 2; fprintf(output_file, "};\n" "const short %srindex[] =\n" "\t{%39d,", symbol_prefix, base[nstates]); j = 10; for (i = nstates + 1; i < 2*nstates; i++) { if (j >= 10) { if (!rflag) ++outline; putc('\n', output_file); j = 1; } else ++j; fprintf(output_file, "%5d,", base[i]); } if (!rflag) outline += 2; fprintf(output_file, "};\n" "const short %sgindex[] =\n" "\t{%39d,", symbol_prefix, base[2*nstates]); j = 10; for (i = 2*nstates + 1; i < nvectors - 1; i++) { if (j >= 10) { if (!rflag) ++outline; putc('\n', output_file); j = 1; } else ++j; fprintf(output_file, "%5d,", base[i]); } if (!rflag) outline += 2; fprintf(output_file, "\n};\n"); free(base); } void output_table(void) { int i, j; ++outline; fprintf(code_file, "#define YYTABLESIZE %d\n", high); fprintf(output_file, "const short %stable[] =\n" "\t{%40d,", symbol_prefix, table[0]); j = 10; for (i = 1; i <= high; i++) { if (j >= 10) { if (!rflag) ++outline; putc('\n', output_file); j = 1; } else ++j; fprintf(output_file, "%5d,", table[i]); } if (!rflag) outline += 2; fprintf(output_file, "\n};\n"); free(table); } void output_check(void) { int i, j; fprintf(output_file, "const short %scheck[] =\n" "\t{%40d,", symbol_prefix, check[0]); j = 10; for (i = 1; i <= high; i++) { if (j >= 10) { if (!rflag) ++outline; putc('\n', output_file); j = 1; } else ++j; fprintf(output_file, "%5d,", check[i]); } if (!rflag) outline += 2; fprintf(output_file, "\n};\n"); free(check); } int is_C_identifier(char *name) { char *s; int c; s = name; c = (unsigned char)*s; if (c == '"') { c = (unsigned char)*++s; if (!isalpha(c) && c != '_' && c != '$') return (0); while ((c = (unsigned char)*++s) != '"') { if (!isalnum(c) && c != '_' && c != '$') return (0); } return (1); } if (!isalpha(c) && c != '_' && c != '$') return (0); while ((c = (unsigned char)*++s)) { if (!isalnum(c) && c != '_' && c != '$') return (0); } return (1); } void output_defines(void) { int c, i; char *s; for (i = 2; i < ntokens; ++i) { s = symbol_name[i]; if (is_C_identifier(s)) { fprintf(code_file, "#define "); if (dflag) fprintf(defines_file, "#define "); c = (unsigned char)*s; if (c == '"') { while ((c = (unsigned char)*++s) != '"') { putc(c, code_file); if (dflag) putc(c, defines_file); } } else { do { putc(c, code_file); if (dflag) putc(c, defines_file); } while ((c = (unsigned char)*++s)); } ++outline; fprintf(code_file, " %d\n", symbol_value[i]); if (dflag) fprintf(defines_file, " %d\n", symbol_value[i]); } } ++outline; fprintf(code_file, "#define YYERRCODE %d\n", symbol_value[1]); if (dflag && unionized) { fclose(union_file); union_file = fopen(union_file_name, "r"); if (union_file == NULL) open_error(union_file_name); while ((c = getc(union_file)) != EOF) putc(c, defines_file); fprintf(defines_file, " YYSTYPE;\n"); fprintf(defines_file, "#endif /* YYSTYPE_DEFINED */\n"); fprintf(defines_file, "extern YYSTYPE %slval;\n", symbol_prefix); } } void output_stored_text(void) { int c; FILE *in, *out; fclose(text_file); text_file = fopen(text_file_name, "r"); if (text_file == NULL) open_error(text_file_name); in = text_file; if ((c = getc(in)) == EOF) return; out = code_file; if (c == '\n') ++outline; putc(c, out); while ((c = getc(in)) != EOF) { if (c == '\n') ++outline; putc(c, out); } if (!lflag) fprintf(out, line_format, ++outline + 1, code_file_name); } void output_debug(void) { int i, j, k, max; char **symnam, *s; ++outline; fprintf(code_file, "#define YYFINAL %d\n", final_state); outline += 3; fprintf(code_file, "#ifndef YYDEBUG\n#define YYDEBUG %d\n#endif\n", tflag); if (rflag) fprintf(output_file, "#ifndef YYDEBUG\n#define YYDEBUG %d\n#endif\n", tflag); max = 0; for (i = 2; i < ntokens; ++i) if (symbol_value[i] > max) max = symbol_value[i]; ++outline; fprintf(code_file, "#define YYMAXTOKEN %d\n", max); symnam = calloc(max+1, sizeof(char *)); if (symnam == NULL) no_space(); for (i = ntokens - 1; i >= 2; --i) symnam[symbol_value[i]] = symbol_name[i]; symnam[0] = "end-of-file"; if (!rflag) ++outline; fprintf(output_file, "#if YYDEBUG\n" "const char * const %sname[] =\n" "\t{", symbol_prefix); j = 80; for (i = 0; i <= max; ++i) { if ((s = symnam[i]) != '\0') { if (s[0] == '"') { k = 7; while (*++s != '"') { ++k; if (*s == '\\') { k += 2; if (*++s == '\\') ++k; } } j += k; if (j > 80) { if (!rflag) ++outline; putc('\n', output_file); j = k; } fprintf(output_file, "\"\\\""); s = symnam[i]; while (*++s != '"') { if (*s == '\\') { fprintf(output_file, "\\\\"); if (*++s == '\\') fprintf(output_file, "\\\\"); else putc(*s, output_file); } else putc(*s, output_file); } fprintf(output_file, "\\\"\","); } else if (s[0] == '\'') { if (s[1] == '"') { j += 7; if (j > 80) { if (!rflag) ++outline; putc('\n', output_file); j = 7; } fprintf(output_file, "\"'\\\"'\","); } else { k = 5; while (*++s != '\'') { ++k; if (*s == '\\') { k += 2; if (*++s == '\\') ++k; } } j += k; if (j > 80) { if (!rflag) ++outline; putc('\n', output_file); j = k; } fprintf(output_file, "\"'"); s = symnam[i]; while (*++s != '\'') { if (*s == '\\') { fprintf(output_file, "\\\\"); if (*++s == '\\') fprintf(output_file, "\\\\"); else putc(*s, output_file); } else putc(*s, output_file); } fprintf(output_file, "'\","); } } else { k = strlen(s) + 3; j += k; if (j > 80) { if (!rflag) ++outline; putc('\n', output_file); j = k; } putc('"', output_file); do { putc(*s, output_file); } while (*++s); fprintf(output_file, "\","); } } else { j += 2; if (j > 80) { if (!rflag) ++outline; putc('\n', output_file); j = 2; } fprintf(output_file, "0,"); } } if (!rflag) outline += 2; fprintf(output_file, "\n};\n"); free(symnam); if (!rflag) ++outline; fprintf(output_file, "const char * const %srule[] =\n" "\t{", symbol_prefix); for (i = 2; i < nrules; ++i) { fprintf(output_file, "\"%s :", symbol_name[rlhs[i]]); for (j = rrhs[i]; ritem[j] > 0; ++j) { s = symbol_name[ritem[j]]; if (s[0] == '"') { fprintf(output_file, " \\\""); while (*++s != '"') { if (*s == '\\') { if (s[1] == '\\') fprintf(output_file, "\\\\\\\\"); else fprintf(output_file, "\\\\%c", s[1]); ++s; } else putc(*s, output_file); } fprintf(output_file, "\\\""); } else if (s[0] == '\'') { if (s[1] == '"') fprintf(output_file, " '\\\"'"); else if (s[1] == '\\') { if (s[2] == '\\') fprintf(output_file, " '\\\\\\\\"); else fprintf(output_file, " '\\\\%c", s[2]); s += 2; while (*++s != '\'') putc(*s, output_file); putc('\'', output_file); } else fprintf(output_file, " '%c'", s[1]); } else fprintf(output_file, " %s", s); } if (!rflag) ++outline; fprintf(output_file, "\",\n"); } if (!rflag) outline += 2; fprintf(output_file, "};\n#endif\n"); } void output_stype(void) { if (!unionized && ntags == 0) { outline += 3; fprintf(code_file, "#ifndef YYSTYPE\ntypedef int YYSTYPE;\n#endif\n"); } } void output_trailing_text(void) { int c, last; FILE *in, *out; if (line == 0) return; in = input_file; out = code_file; c = (unsigned char)*cptr; if (c == '\n') { ++lineno; if ((c = getc(in)) == EOF) return; if (!lflag) { ++outline; fprintf(out, line_format, lineno, input_file_name); } if (c == '\n') ++outline; putc(c, out); last = c; } else { if (!lflag) { ++outline; fprintf(out, line_format, lineno, input_file_name); } do { putc(c, out); } while ((c = (unsigned char)*++cptr) != '\n'); ++outline; putc('\n', out); last = '\n'; } while ((c = getc(in)) != EOF) { if (c == '\n') ++outline; putc(c, out); last = c; } if (last != '\n') { ++outline; putc('\n', out); } if (!lflag) fprintf(out, line_format, ++outline + 1, code_file_name); } void output_semantic_actions(void) { int c, last; FILE *out; fclose(action_file); action_file = fopen(action_file_name, "r"); if (action_file == NULL) open_error(action_file_name); if ((c = getc(action_file)) == EOF) return; out = code_file; last = c; if (c == '\n') ++outline; putc(c, out); while ((c = getc(action_file)) != EOF) { if (c == '\n') ++outline; putc(c, out); last = c; } if (last != '\n') { ++outline; putc('\n', out); } if (!lflag) fprintf(out, line_format, ++outline + 1, code_file_name); } void free_itemsets(void) { core *cp, *next; free(state_table); for (cp = first_state; cp; cp = next) { next = cp->next; free(cp); } } void free_shifts(void) { shifts *sp, *next; free(shift_table); for (sp = first_shift; sp; sp = next) { next = sp->next; free(sp); } } void free_reductions(void) { reductions *rp, *next; free(reduction_table); for (rp = first_reduction; rp; rp = next) { next = rp->next; free(rp); } }