Index: ChangeLog from Benoit Perrot &lt;benoit(a)lrde.epita.fr&gt; * monoburg.y: Rename to... * parser.y: This, and let automake automaticaly invoke bison to create `parser.c'. * Makefile.am: Let autoconf add the correct extension to the generated binary. Distribute `sample.brg' as a test. * config/Makefile.am: New. * configure.ac: New. 2004-06-24 David Waite &lt;mass(a)akuma.org&gt; * monoburg.c: change to C90-style comments from C99/C++-style Wed Apr 14 12:40:54 CEST 2004 Paolo Molaro &lt;lupus(a)ximian.com&gt; * monoburg.c, monoburg.h, monoburg.y: changed the grammar so that the same emit code can be easily associated with multiple rules. Coalesce identical emit functions to reduce code size (10 KB - 10 % - with the current unchanged x86 JIT rules). 2002-10-28 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (emit_state): use 16bit values for registers, removed reg3 and spilled flag. 2002-10-17 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.y: added missing semicolon 2002-10-11 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (emit_tree_match): omit unnecessary compare (emit_label_func): make it possible to print operator names in error messages. 2002-10-09 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (check_result): emit a warning instead of an error 2002-10-03 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c: added new %termprefix mode 2002-09-30 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (main): add option to specify default costs, added experimental code to handle several input files. 2002-09-26 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (emit_state): include additional fields to handle register allocation in dag_mode 2002-09-25 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * added -p and -e options. monoburg is now able to work with DAGs. 2002-04-20 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.y (yylex): bug fix in number parsing 2002-04-12 Gonzalo Paniagua Javier &lt;gonzalo(a)ximian.com&gt; * monoburg.c: added option -s to specify the c source file for output. 2002-04-11 Gonzalo Paniagua Javier &lt;gonzalo(a)ximian.com&gt; * monoburg.c: added a default handler for warning messages that just output the messages to stderr instead of stdout. Mon Feb 18 14:28:10 CET 2002 Paolo Molaro &lt;lupus(a)ximian.com&gt; * Makefile.am: fix compatibility problem with automake 1.4. Fri Feb 15 14:20:30 CET 2002 Paolo Molaro &lt;lupus(a)ximian.com&gt; * Makefile.am: avoid automake for build on host stuff. Fri Feb 8 12:31:40 CET 2002 Paolo Molaro &lt;lupus(a)ximian.com&gt; * monoburg.c: make generated arrays const, so that they are shared. Fri Feb 1 15:14:16 CET 2002 Paolo Molaro &lt;lupus(a)ximian.com&gt; * Makefile.am: support cross-compilation. 2001-11-07 Miguel de Icaza &lt;miguel(a)ximian.com&gt; * monoburg.y: Include string.h, stdlib.h to kill warnings. * sample.brg: Include string.h to remove warnings. 2001-09-23 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c: add a macro MBALLOC_STATE to define the allocation function for MBState. Added an additional user data argument to mono_burg_label - the data can be used in the cost functions. The type can be defined with MBCOST_DATA macro. (emit_cost_func): inline cost functions 2001-09-22 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.y (strndup): removed, use g_strndup instead * monoburg.c (create_term): bug fix: g_strdup strings from the parser 2001-09-21 Miguel de Icaza &lt;miguel(a)ximian.com&gt; * Makefile.am (EXTRA_DIST): Add man page to the distro 2001-09-21 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.y (yylex): bug fix 2001-09-19 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (emit_header): bug fix for MBCOND macro Tue Sep 18 13:15:12 CEST 2001 Paolo Molaro &lt;lupus(a)ximian.com&gt; * monoburg.y: fix ANSI C issue. 2001-09-14 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (emit_prototypes): add an additional argument to the code emit function - a pointer to the code buffer Tue Sep 11 13:46:35 CEST 2001 Paolo Molaro &lt;lupus(a)ximian.com&gt; * Makefile.am: get it to work on platforms that insist on having a weird extension at the end of an executable name. Mon Sep 10 17:24:45 CEST 2001 Paolo Molaro &lt;lupus(a)ximian.com&gt; * Makefile.am: make it work for make distcheck. 2001-09-09 Nick Drochak &lt;ndrochak(a)gol.com&gt; * Makefile.am: change CLEANFILES line to use just '=' instead of '+=' some versions of automake complain if you try to '+=' before you '=' 2001-09-08 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (emit_header): added some convenient macros * monoburg.y (optcfunc): allow arbitrary cost functions 2001-09-06 Dietmar Maurer &lt;dietmar(a)ximian.com&gt; * monoburg.c (emit_header): use macros to access the tree (like in iburg) ++ monoburg.1 (revision 0) .\" .\" monoburg manual page. .\" (C) Ximian, Inc. .\" Author: .\" Dietmar Maurer (dietmar(a)ximian.com) .\" .TH Mono "Mono 1.0" .SH NAME monoburg \- code generator generator .SH SYNOPSIS .PP .B monoburg [\-h] [\-e] [\-p] [\-c VALUE] [\-d HEADER] [\-DVALUE] [FILE...] .SH DESCRIPTION The \fImonoburg\fP program is used to generate tree pattern matchers from BURG specifications. \fImonoburg\fP accepts the following EBNF grammar. .PP .nf .RS .ft CW spec: ccode `%%' { dcl } [`%%' ccode] dcl: `%start' nonterm `%term' { identifier [`=' integer] } `%termprefix' { identifier } nonterm `:' tree [cost] [ `{' ccode `}' ] [costfunc] tree: term `(' tree `,' tree `)' term `(' tree `)' term nonterm cost: `"' string '"' integer costfunc: `cost' `{' ccode `}' .RE .fi .PP Where \fIccode\fP is arbitrary C code. \fIcost\fP and \fIcostfunc\fP are used mutually exclusive, you can't use both in one rule. \fIcost\fP must be a C expression, whereas \fIccode\fP inside \fIcostfunc\fP is the body of a C function. Here are some example rules: .PP .nf .RS .ft CW # define some terminal %term Fetch Four Mul Plus # this rule uses fixed costs addr: Plus (con, Mul (Four, reg)) 2 { printf ("Emit your code here."); } # this one computes costs inside a function reg: Fetch (addr) { printf ("Tree address is %p", tree); } cost { int c; c = 1; /* calculate the costs here */ return c; } .RE .fi .PP A simple pre-processor is included, consisting of: %ifdef, %else and %endif. %ifdef operates on definitions from the command line. .SH OPTIONS The following options are supported: .TP .I "-h" Displays usage instructions. .TP .I "-d HEADER" Writes a separate header file which contains all monoburg definitions. .TP .I "-p" Assume termainals are already defined. Its possible to omit the %term definitions in this mode if you use the %termprefix command. All symbols starting with a prefix specified in %termprefix are considered to be terminals. .TP .I "-e" Extended mode. Enables monoburg to work with DAGs. .TP .I "-c VALUE" Set the default costs to VALUE .TP .I "-Dvar" Defines the variable "var" as true. This is used with %ifdef, %else and %endif in the source files to perform conditional compilation. .PP .SH AUTHOR monoburg was written by Dietmar Maurer. It is based on the papers from Christopher W.\ Fraser, Robert R.\ Henry and Todd A.\ Proebsting: "BURG - Fast Optimal Instruction Selection and Tree Parsing" and "Engineering a Simple, Efficient Code Generator Generator". .SH SEE ALSO .BR monodis(1) .BR pedump(1) ++ Makefile.am (revision 0) ## Makefile.am -- Process this file with automake to produce Makefile.in ## SUBDIRS = config ## Include path INCLUDES = $(GLIB_CFLAGS) -I$(srcdir) ## MonoBURG binary bin_PROGRAMS = monoburg monoburg_SOURCES = \ parser.y \ monoburg.c monoburg.h monoburg_LDADD = \ $(GLIB_LIBS) ## MonoBURG manual man_MANS = monoburg.1 EXTRA_DIST = $(man_MANS) ## Check/Sample check_PROGRAMS = sample TESTS = sample sample.c: monoburg$(EXEEXT) $(srcdir)/sample.brg ./monoburg$(EXEEXT) $(srcdir)/sample.brg > sample.c sample_SOURCES = sample.brg sample_LDADD = sample.o $(GLIB_LIBS) CLEANFILES = sample.c ++ monoburg.c (revision 0) /* * monoburg.c: an iburg like code generator generator * * Author: * Dietmar Maurer (dietmar(a)ximian.com) * * (C) 2001 Ximian, Inc. */ #include <stdio.h> #include <string.h> #include <stdlib.h> #include "monoburg.h" extern void yyparse (void); static GHashTable *term_hash; static GList *term_list; static GHashTable *nonterm_hash; static GList *nonterm_list; static GList *rule_list; static GList *prefix_list; FILE *inputfd; FILE *outputfd; GHashTable *definedvars; static FILE *deffd; static FILE *cfd; static int dag_mode = 0; static int predefined_terms = 0; static int default_cost = 0; static void output (char *fmt, ...) { va_list ap; va_start(ap, fmt); vfprintf (outputfd, fmt, ap); va_end (ap); } Rule* make_rule (char *id, Tree *tree) { Rule *rule = g_new0 (Rule, 1); rule->lhs = nonterm (id); rule->tree = tree; return rule; } void rule_add (Rule *rule, char *code, char *cost, char *cfunc) { if (!cfunc && !cost) cost = g_strdup_printf ("%d", default_cost); rule_list = g_list_append (rule_list, rule); rule->cost = g_strdup (cost); rule->cfunc = g_strdup (cfunc); rule->code = g_strdup (code); if (cfunc) { if (cost) yyerror ("duplicated costs (constant costs and cost function)"); else { if (dag_mode) rule->cost = g_strdup_printf ("mono_burg_cost_%d (p, data)", g_list_length (rule_list)); else rule->cost = g_strdup_printf ("mono_burg_cost_%d (tree, data)", g_list_length (rule_list)); } } rule->lhs->rules = g_list_append (rule->lhs->rules, rule); if (rule->tree->op) rule->tree->op->rules = g_list_append (rule->tree->op->rules, rule); else rule->tree->nonterm->chain = g_list_append (rule->tree->nonterm->chain, rule); } void create_rule (char *id, Tree *tree, char *code, char *cost, char *cfunc) { Rule *rule = make_rule (id, tree); rule_add (rule, code, cost, cfunc); } Tree * create_tree (char *id, Tree *left, Tree *right) { int arity = (left != NULL) + (right != NULL); Term *term = NULL; Tree *tree = g_new0 (Tree, 1); if (term_hash) term = g_hash_table_lookup (term_hash, id); /* try if id has termprefix */ if (!term) { GList *pl; for (pl = prefix_list; pl; pl = pl->next) { char *pfx = (char *)pl->data; if (!strncmp (pfx, id, strlen (pfx))) { term = create_term (id, -1); break; } } } if (term) { if (term->arity == -1) term->arity = arity; if (term->arity != arity) yyerror ("changed arity of terminal %s from %d to %d", id, term->arity, arity); tree->op = term; tree->left = left; tree->right = right; } else { tree->nonterm = nonterm (id); } return tree; } static void check_term_num (char *key, Term *value, int num) { if (num != -1 && value->number == num) yyerror ("duplicate terminal id \"%s\"", key); } void create_term_prefix (char *id) { if (!predefined_terms) yyerror ("%termprefix is only available with -p option"); prefix_list = g_list_prepend (prefix_list, g_strdup (id)); } Term * create_term (char *id, int num) { Term *term; if (!predefined_terms && nonterm_list) yyerror ("terminal definition after nonterminal definition"); if (num < -1) yyerror ("invalid terminal number %d", num); if (!term_hash) term_hash = g_hash_table_new (g_str_hash , g_str_equal); g_hash_table_foreach (term_hash, (GHFunc) check_term_num, (gpointer) num); term = g_new0 (Term, 1); term->name = g_strdup (id); term->number = num; term->arity = -1; term_list = g_list_append (term_list, term); g_hash_table_insert (term_hash, term->name, term); return term; } NonTerm * nonterm (char *id) { NonTerm *nterm; if (!nonterm_hash) nonterm_hash = g_hash_table_new (g_str_hash , g_str_equal); if ((nterm = g_hash_table_lookup (nonterm_hash, id))) return nterm; nterm = g_new0 (NonTerm, 1); nterm->name = g_strdup (id); nonterm_list = g_list_append (nonterm_list, nterm); nterm->number = g_list_length (nonterm_list); g_hash_table_insert (nonterm_hash, nterm->name, nterm); return nterm; } void start_nonterm (char *id) { static gboolean start_def; if (start_def) yyerror ("start symbol redeclared"); start_def = TRUE; nonterm (id); } static void emit_tree_string (Tree *tree) { if (tree->op) { output ("%s", tree->op->name); if (tree->op->arity) { output ("("); emit_tree_string (tree->left); if (tree->right) { output (", "); emit_tree_string (tree->right); } output (")"); } } else output ("%s", tree->nonterm->name); } static void emit_rule_string (Rule *rule, char *fill) { output ("%s/* ", fill); output ("%s: ", rule->lhs->name); emit_tree_string (rule->tree); output (" */\n"); } static int next_term_num () { GList *l = term_list; int i = 1; while (l) { Term *t = (Term *)l->data; if (t->number == i) { l = term_list; i++; } else l = l->next; } return i; } static int term_compare_func (Term *t1, Term *t2) { return t1->number - t2->number; } static void emit_header () { GList *l; output ("#include <glib.h>\n"); output ("\n"); output ("#ifndef MBTREE_TYPE\n#error MBTREE_TYPE undefined\n#endif\n"); output ("#ifndef MBTREE_OP\n#define MBTREE_OP(t) ((t)->op)\n#endif\n"); output ("#ifndef MBTREE_LEFT\n#define MBTREE_LEFT(t) ((t)->left)\n#endif\n"); output ("#ifndef MBTREE_RIGHT\n#define MBTREE_RIGHT(t) ((t)->right)\n#endif\n"); output ("#ifndef MBTREE_STATE\n#define MBTREE_STATE(t) ((t)->state)\n#endif\n"); output ("#ifndef MBCGEN_TYPE\n#define MBCGEN_TYPE int\n#endif\n"); output ("#ifndef MBALLOC_STATE\n#define MBALLOC_STATE g_new (MBState, 1)\n#endif\n"); output ("#ifndef MBCOST_DATA\n#define MBCOST_DATA gpointer\n#endif\n"); output ("\n"); output ("#define MBMAXCOST 32768\n"); output ("\n"); output ("#define MBCOND(x) if (!(x)) return MBMAXCOST;\n"); output ("\n"); for (l = term_list; l; l = l->next) { Term *t = (Term *)l->data; if (t->number == -1) t->number = next_term_num (); } term_list = g_list_sort (term_list, (GCompareFunc)term_compare_func); for (l = term_list; l; l = l->next) { Term *t = (Term *)l->data; if (t->number == -1) t->number = next_term_num (); if (predefined_terms) output ("#define MB_TERM_%s\t %s\n", t->name, t->name); else output ("#define MB_TERM_%s\t %d\n", t->name, t->number); } output ("\n"); } static void emit_nonterm () { GList *l; for (l = nonterm_list; l; l = l->next) { NonTerm *n = (NonTerm *)l->data; output ("#define MB_NTERM_%s\t%d\n", n->name, n->number); } output ("#define MB_MAX_NTERMS\t%d\n", g_list_length (nonterm_list)); output ("\n"); } static void emit_state () { GList *l; int i, j; output ("typedef struct _MBState MBState;\n"); output ("struct _MBState {\n"); output ("\tint\t\t op;\n"); if (dag_mode) { output ("\tMBTREE_TYPE\t *tree;\n"); output ("\tgint32 reg1, reg2;\n"); } output ("\tMBState\t\t*left, *right;\n"); output ("\tguint16\t\tcost[%d];\n", g_list_length (nonterm_list) + 1); for (l = nonterm_list; l; l = l->next) { NonTerm *n = (NonTerm *)l->data; g_assert (g_list_length (n->rules) < 256); i = g_list_length (n->rules); j = 1; while (i >>= 1) j++; output ("\tunsigned int\t rule_%s:%d;\n", n->name, j); } output ("};\n\n"); } static void emit_decoders () { GList *l; GList *rl; for (l = nonterm_list; l; l = l->next) { NonTerm *n = (NonTerm *)l->data; output ("const int mono_burg_decode_%s[] = {\n", n->name); output ("\t0,\n"); for (rl = n->rules; rl; rl = rl->next) { Rule *rule = (Rule *)rl->data; output ("\t%d,\n", g_list_index (rule_list, rule) + 1); } output ("};\n\n"); } } static void emit_tree_match (char *st, Tree *t) { char *tn; int not_first = strcmp (st, "p->"); /* we can omit this check at the top level */ if (not_first) { if (predefined_terms) output ("\t\t\t%sop == %s /* %s */", st, t->op->name, t->op->name); else output ("\t\t\t%sop == %d /* %s */", st, t->op->number, t->op->name); } if (t->left && t->left->op) { tn = g_strconcat (st, "left->", NULL); if (not_first) output (" &&\n"); not_first = 1; emit_tree_match (tn, t->left); g_free (tn); } if (t->right && t->right->op) { tn = g_strconcat (st, "right->", NULL); if (not_first) output (" &&\n"); emit_tree_match (tn, t->right); g_free (tn); } } static void emit_rule_match (Rule *rule) { Tree *t = rule->tree; if ((t->left && t->left->op) || (t->right && t->right->op)) { output ("\t\tif (\n"); emit_tree_match ("p->", t); output ("\n\t\t)\n"); } } static void emit_costs (char *st, Tree *t) { char *tn; if (t->op) { if (t->left) { tn = g_strconcat (st, "left->", NULL); emit_costs (tn, t->left); g_free (tn); } if (t->right) { tn = g_strconcat (st, "right->", NULL); emit_costs (tn, t->right); } } else output ("%scost[MB_NTERM_%s] + ", st, t->nonterm->name); } static void emit_cond_assign (Rule *rule, char *cost, char *fill) { char *rc; if (cost) rc = g_strconcat ("c + ", cost, NULL); else rc = g_strdup ("c"); output ("%sif (%s < p->cost[MB_NTERM_%s]) {\n", fill, rc, rule->lhs->name); output ("%s\tp->cost[MB_NTERM_%s] = %s;\n", fill, rule->lhs->name, rc); output ("%s\tp->rule_%s = %d;\n", fill, rule->lhs->name, g_list_index (rule->lhs->rules, rule) + 1); if (rule->lhs->chain) output ("%s\tclosure_%s (p, %s);\n", fill, rule->lhs->name, rc); output ("%s}\n", fill); g_free (rc); } static void emit_label_func () { GList *l; int i; if (dag_mode) { output ("static void\n"); output ("mono_burg_label_priv (MBTREE_TYPE *tree, MBCOST_DATA *data, MBState *p) {\n"); } else { output ("static MBState *\n"); output ("mono_burg_label_priv (MBTREE_TYPE *tree, MBCOST_DATA *data) {\n"); } output ("\tint arity;\n"); output ("\tint c;\n"); if (!dag_mode) output ("\tMBState *p;\n"); output ("\tMBState *left = NULL, *right = NULL;\n\n"); output ("\tswitch (mono_burg_arity [MBTREE_OP(tree)]) {\n"); output ("\tcase 0:\n"); output ("\t\tbreak;\n"); output ("\tcase 1:\n"); if (dag_mode) { output ("\t\tleft = MBALLOC_STATE;\n"); output ("\t\tmono_burg_label_priv (MBTREE_LEFT(tree), data, left);\n"); } else { output ("\t\tleft = mono_burg_label_priv (MBTREE_LEFT(tree), data);\n"); output ("\t\tright = NULL;\n"); } output ("\t\tbreak;\n"); output ("\tcase 2:\n"); if (dag_mode) { output ("\t\tleft = MBALLOC_STATE;\n"); output ("\t\tmono_burg_label_priv (MBTREE_LEFT(tree), data, left);\n"); output ("\t\tright = MBALLOC_STATE;\n"); output ("\t\tmono_burg_label_priv (MBTREE_RIGHT(tree), data, right);\n"); } else { output ("\t\tleft = mono_burg_label_priv (MBTREE_LEFT(tree), data);\n"); output ("\t\tright = mono_burg_label_priv (MBTREE_RIGHT(tree), data);\n"); } output ("\t}\n\n"); output ("\tarity = (left != NULL) + (right != NULL);\n"); output ("\tg_assert (arity == mono_burg_arity [MBTREE_OP(tree)]);\n\n"); if (!dag_mode) output ("\tp = MBALLOC_STATE;\n"); output ("\tmemset (p, 0, sizeof (MBState));\n"); output ("\tp->op = MBTREE_OP(tree);\n"); output ("\tp->left = left;\n"); output ("\tp->right = right;\n"); if (dag_mode) output ("\tp->tree = tree;\n"); for (l = nonterm_list, i = 0; l; l = l->next) { output ("\tp->cost [%d] = 32767;\n", ++i); } output ("\n"); output ("\tswitch (MBTREE_OP(tree)) {\n"); for (l = term_list; l; l = l->next) { Term *t = (Term *)l->data; GList *rl; if (predefined_terms) output ("\tcase %s: /* %s */\n", t->name, t->name); else output ("\tcase %d: /* %s */\n", t->number, t->name); for (rl = t->rules; rl; rl = rl->next) { Rule *rule = (Rule *)rl->data; Tree *t = rule->tree; emit_rule_string (rule, "\t\t"); emit_rule_match (rule); output ("\t\t{\n"); output ("\t\t\tc = "); emit_costs ("", t); output ("%s;\n", rule->cost); emit_cond_assign (rule, NULL, "\t\t\t"); output ("\t\t}\n"); } output ("\t\tbreak;\n"); } output ("\tdefault:\n"); output ("#ifdef MBGET_OP_NAME\n"); output ("\t\tg_error (\"unknown operator: %%s\", MBGET_OP_NAME(MBTREE_OP(tree)));\n"); output ("#else\n"); output ("\t\tg_error (\"unknown operator: 0x%%04x\", MBTREE_OP(tree));\n"); output ("#endif\n"); output ("\t}\n\n"); if (!dag_mode) { output ("\tMBTREE_STATE(tree) = p;\n"); output ("\treturn p;\n"); } output ("}\n\n"); output ("MBState *\n"); output ("mono_burg_label (MBTREE_TYPE *tree, MBCOST_DATA *data)\n{\n"); if (dag_mode) { output ("\tMBState *p = MBALLOC_STATE;\n"); output ("\tmono_burg_label_priv (tree, data, p);\n"); } else { output ("\tMBState *p = mono_burg_label_priv (tree, data);\n"); } output ("\treturn p->rule_%s ? p : NULL;\n", ((NonTerm *)nonterm_list->data)->name); output ("}\n\n"); } static char * compute_kids (char *ts, Tree *tree, int *n) { char *res; if (tree->nonterm) { return g_strdup_printf ("\t\tkids[%d] = %s;\n", (*n)++, ts); } else if (tree->op && tree->op->arity) { char *res2 = NULL; if (dag_mode) { res = compute_kids (g_strdup_printf ("%s->left", ts), tree->left, n); if (tree->op->arity == 2) res2 = compute_kids (g_strdup_printf ("%s->right", ts), tree->right, n); } else { res = compute_kids (g_strdup_printf ("MBTREE_LEFT(%s)", ts), tree->left, n); if (tree->op->arity == 2) res2 = compute_kids (g_strdup_printf ("MBTREE_RIGHT(%s)", ts), tree->right, n); } return g_strconcat (res, res2, NULL); } return ""; } static void emit_kids () { GList *l, *nl; int i, j, c, n, *si; char **sa; output ("int\n"); output ("mono_burg_rule (MBState *state, int goal)\n{\n"); output ("\tg_return_val_if_fail (state != NULL, 0);\n"); output ("\tg_return_val_if_fail (goal > 0, 0);\n\n"); output ("\tswitch (goal) {\n"); for (nl = nonterm_list; nl; nl = nl->next) { NonTerm *n = (NonTerm *)nl->data; output ("\tcase MB_NTERM_%s:\n", n->name); output ("\t\treturn mono_burg_decode_%s [state->rule_%s];\n", n->name, n->name); } output ("\tdefault: g_assert_not_reached ();\n"); output ("\t}\n"); output ("\treturn 0;\n"); output ("}\n\n"); if (dag_mode) { output ("MBState **\n"); output ("mono_burg_kids (MBState *state, int rulenr, MBState *kids [])\n{\n"); output ("\tg_return_val_if_fail (state != NULL, NULL);\n"); output ("\tg_return_val_if_fail (kids != NULL, NULL);\n\n"); } else { output ("MBTREE_TYPE **\n"); output ("mono_burg_kids (MBTREE_TYPE *tree, int rulenr, MBTREE_TYPE *kids [])\n{\n"); output ("\tg_return_val_if_fail (tree != NULL, NULL);\n"); output ("\tg_return_val_if_fail (kids != NULL, NULL);\n\n"); } output ("\tswitch (rulenr) {\n"); n = g_list_length (rule_list); sa = g_new0 (char *, n); si = g_new0 (int, n); /* compress the case statement */ for (l = rule_list, i = 0, c = 0; l; l = l->next) { Rule *rule = (Rule *)l->data; int kn = 0; char *k; if (dag_mode) k = compute_kids ("state", rule->tree, &kn); else k = compute_kids ("tree", rule->tree, &kn); for (j = 0; j < c; j++) if (!strcmp (sa [j], k)) break; si [i++] = j; if (j == c) sa [c++] = k; } for (i = 0; i < c; i++) { for (l = rule_list, j = 0; l; l = l->next, j++) if (i == si [j]) output ("\tcase %d:\n", j + 1); output ("%s", sa [i]); output ("\t\tbreak;\n"); } output ("\tdefault:\n\t\tg_assert_not_reached ();\n"); output ("\t}\n"); output ("\treturn kids;\n"); output ("}\n\n"); } static void emit_emitter_func () { GList *l; int i, rulen; GHashTable *cache = g_hash_table_new (g_str_hash, g_str_equal); for (l = rule_list, i = 0; l; l = l->next) { Rule *rule = (Rule *)l->data; if (rule->code) { if ((rulen = GPOINTER_TO_INT (g_hash_table_lookup (cache, rule->code)))) { emit_rule_string (rule, ""); output ("#define mono_burg_emit_%d mono_burg_emit_%d\n\n", i, rulen); i++; continue; } output ("static void "); emit_rule_string (rule, ""); if (dag_mode) output ("mono_burg_emit_%d (MBState *state, MBTREE_TYPE *tree, MBCGEN_TYPE *s)\n", i); else output ("mono_burg_emit_%d (MBTREE_TYPE *tree, MBCGEN_TYPE *s)\n", i); output ("{\n"); output ("%s\n", rule->code); output ("}\n\n"); g_hash_table_insert (cache, rule->code, GINT_TO_POINTER (i)); } i++; } g_hash_table_destroy (cache); output ("MBEmitFunc const mono_burg_func [] = {\n"); output ("\tNULL,\n"); for (l = rule_list, i = 0; l; l = l->next) { Rule *rule = (Rule *)l->data; if (rule->code) output ("\tmono_burg_emit_%d,\n", i); else output ("\tNULL,\n"); i++; } output ("};\n\n"); } static void emit_cost_func () { GList *l; int i; for (l = rule_list, i = 0; l; l = l->next) { Rule *rule = (Rule *)l->data; if (rule->cfunc) { output ("inline static guint16\n"); emit_rule_string (rule, ""); if (dag_mode) output ("mono_burg_cost_%d (MBState *state, MBCOST_DATA *data)\n", i + 1); else output ("mono_burg_cost_%d (MBTREE_TYPE *tree, MBCOST_DATA *data)\n", i + 1); output ("{\n"); output ("%s\n", rule->cfunc); output ("}\n\n"); } i++; } } static void emit_closure () { GList *l, *rl; for (l = nonterm_list; l; l = l->next) { NonTerm *n = (NonTerm *)l->data; if (n->chain) output ("static void closure_%s (MBState *p, int c);\n", n->name); } output ("\n"); for (l = nonterm_list; l; l = l->next) { NonTerm *n = (NonTerm *)l->data; if (n->chain) { output ("static void\n"); output ("closure_%s (MBState *p, int c)\n{\n", n->name); for (rl = n->chain; rl; rl = rl->next) { Rule *rule = (Rule *)rl->data; emit_rule_string (rule, "\t"); emit_cond_assign (rule, rule->cost, "\t"); } output ("}\n\n"); } } } static char * compute_nonterms (Tree *tree) { if (!tree) return ""; if (tree->nonterm) { return g_strdup_printf ("MB_NTERM_%s, ", tree->nonterm->name); } else { return g_strconcat (compute_nonterms (tree->left), compute_nonterms (tree->right), NULL); } } static void emit_vardefs () { GList *l; int i, j, c, n, *si; char **sa; if (predefined_terms) { output ("guint8 mono_burg_arity [MBMAX_OPCODES];\n"); output ("void\nmono_burg_init (void)\n{\n"); for (l = term_list, i = 0; l; l = l->next) { Term *t = (Term *)l->data; output ("\tmono_burg_arity [%s] = %d; /* %s */\n", t->name, t->arity, t->name); } output ("}\n\n"); } else { output ("const guint8 mono_burg_arity [] = {\n"); for (l = term_list, i = 0; l; l = l->next) { Term *t = (Term *)l->data; while (i < t->number) { output ("\t0,\n"); i++; } output ("\t%d, /* %s */\n", t->arity, t->name); i++; } output ("};\n\n"); output ("const char *const mono_burg_term_string [] = {\n"); output ("\tNULL,\n"); for (l = term_list, i = 0; l; l = l->next) { Term *t = (Term *)l->data; output ("\t\"%s\",\n", t->name); } output ("};\n\n"); } output ("const char * const mono_burg_rule_string [] = {\n"); output ("\tNULL,\n"); for (l = rule_list, i = 0; l; l = l->next) { Rule *rule = (Rule *)l->data; output ("\t\"%s: ", rule->lhs->name); emit_tree_string (rule->tree); output ("\",\n"); } output ("};\n\n"); n = g_list_length (rule_list); sa = g_new0 (char *, n); si = g_new0 (int, n); /* compress the _nts array */ for (l = rule_list, i = 0, c = 0; l; l = l->next) { Rule *rule = (Rule *)l->data; char *s = compute_nonterms (rule->tree); for (j = 0; j < c; j++) if (!strcmp (sa [j], s)) break; si [i++] = j; if (j == c) { output ("static const guint16 mono_burg_nts_%d [] = { %s0 };\n", c, s); sa [c++] = s; } } output ("\n"); output ("const guint16 *const mono_burg_nts [] = {\n"); output ("\t0,\n"); for (l = rule_list, i = 0; l; l = l->next) { Rule *rule = (Rule *)l->data; output ("\tmono_burg_nts_%d, ", si [i++]); emit_rule_string (rule, ""); } output ("};\n\n"); } static void emit_prototypes () { if (dag_mode) output ("typedef void (*MBEmitFunc) (MBState *state, MBTREE_TYPE *tree, MBCGEN_TYPE *s);\n\n"); else output ("typedef void (*MBEmitFunc) (MBTREE_TYPE *tree, MBCGEN_TYPE *s);\n\n"); output ("extern const char * const mono_burg_term_string [];\n"); output ("extern const char * const mono_burg_rule_string [];\n"); output ("extern const guint16 *const mono_burg_nts [];\n"); output ("extern MBEmitFunc const mono_burg_func [];\n"); output ("MBState *mono_burg_label (MBTREE_TYPE *tree, MBCOST_DATA *data);\n"); output ("int mono_burg_rule (MBState *state, int goal);\n"); if (dag_mode) output ("MBState **mono_burg_kids (MBState *state, int rulenr, MBState *kids []);\n"); else output ("MBTREE_TYPE **mono_burg_kids (MBTREE_TYPE *tree, int rulenr, MBTREE_TYPE *kids []);\n"); output ("extern void mono_burg_init (void);\n"); output ("\n"); } static void check_reach (NonTerm *n); static void mark_reached (Tree *tree) { if (tree->nonterm && !tree->nonterm->reached) check_reach (tree->nonterm); if (tree->left) mark_reached (tree->left); if (tree->right) mark_reached (tree->right); } static void check_reach (NonTerm *n) { GList *l; n->reached = 1; for (l = n->rules; l; l = l->next) { Rule *rule = (Rule *)l->data; mark_reached (rule->tree); } } static void check_result () { GList *l; for (l = term_list; l; l = l->next) { Term *term = (Term *)l->data; if (term->arity == -1) g_warning ("unused terminal \"%s\"",term->name); } check_reach (((NonTerm *)nonterm_list->data)); for (l = nonterm_list; l; l = l->next) { NonTerm *n = (NonTerm *)l->data; if (!n->reached) g_warning ("unreachable nonterm \"%s\"", n->name); } } static void usage () { fprintf (stderr, "Usage is: monoburg -d file.h -s file.c [inputfile] \n"); exit (1); } static void warning_handler (const gchar *log_domain, GLogLevelFlags log_level, const gchar *message, gpointer user_data) { (void) fprintf ((FILE *) user_data, "** WARNING **: %s\n", message); } int main (int argc, char *argv []) { char *cfile = NULL; char *deffile = NULL; GList *infiles = NULL; int i; definedvars = g_hash_table_new (g_str_hash, g_str_equal); g_log_set_handler (NULL, G_LOG_LEVEL_WARNING, warning_handler, stderr); for (i = 1; i < argc; i++){ if (argv [i][0] == '-'){ if (argv [i][1] == 'h') { usage (); } else if (argv [i][1] == 'e') { dag_mode = 1; } else if (argv [i][1] == 'p') { predefined_terms = 1; } else if (argv [i][1] == 'd') { deffile = argv [++i]; } else if (argv [i][1] == 's') { cfile = argv [++i]; } else if (argv [i][1] == 'c') { default_cost = atoi (argv [++i]); } else if (argv [i][1] == 'D') { g_hash_table_insert (definedvars, &argv [i][2], GUINT_TO_POINTER (1)); } else { usage (); } } else { infiles = g_list_append (infiles, argv [i]); } } if (deffile) { if (!(deffd = fopen (deffile, "w"))) { perror ("cant open header output file"); exit (-1); } outputfd = deffd; output ("#ifndef _MONO_BURG_DEFS_\n"); output ("#define _MONO_BURG_DEFS_\n\n"); } else outputfd = stdout; if (infiles) { GList *l = infiles; while (l) { char *infile = (char *)l->data; if (!(inputfd = fopen (infile, "r"))) { perror ("cant open input file"); exit (-1); } yyparse (); reset_parser (); l->data = inputfd; l = l->next; } } else { inputfd = stdin; yyparse (); } check_result (); if (!nonterm_list) g_error ("no start symbol found"); emit_header (); emit_nonterm (); emit_state (); emit_prototypes (); if (deffd) { output ("#endif /* _MONO_BURG_DEFS_ */\n"); fclose (deffd); if (cfile == NULL) outputfd = stdout; else { if (!(cfd = fopen (cfile, "w"))) { perror ("cant open c output file"); (void) remove (deffile); exit (-1); } outputfd = cfd; } output ("#include \"%s\"\n\n", deffile); } emit_vardefs (); emit_cost_func (); emit_emitter_func (); emit_decoders (); emit_closure (); emit_label_func (); emit_kids (); if (infiles) { GList *l = infiles; while (l) { inputfd = l->data; yyparsetail (); fclose (inputfd); l = l->next; } } else { yyparsetail (); } if (cfile) fclose (cfd); return 0; } ++ sample.brg (revision 0) /* * This header (everything before the first "%%") is copied * directly to the output. */ #include <glib.h> #include <stdio.h> #include <string.h> #define MBTREE_TYPE MBTree typedef struct _MBTree MBTree; struct _MBTree { guint16 op; MBTree *left, *right; gpointer state; }; %% these are the monoburg definition # # This is the start of the definitions # comments start with a '#' as first line character # # # we must fisrt define the terminals # with or without numbers # %term Assign Constant Fetch=3 Four=8 Mul=5 Plus=6 AltFetch=7 # # optional start nonterminal # %start reg con: Constant 0 con: Four 0 addr: con 0 addr: Plus(con,reg) { int ern = mono_burg_rule (tree->state, MB_NTERM_addr); printf ("%s\n", mono_burg_rule_string [ern]); } cost { return 1; } addr: Plus(con,Mul(Four,reg)) 2 { int ern = mono_burg_rule (tree->state, MB_NTERM_addr); printf ("%s\n", mono_burg_rule_string [ern]); } reg: AltFetch(addr), reg: Fetch(addr) 1 { int ern = mono_burg_rule (tree->state, MB_NTERM_reg); printf ("%s\n", mono_burg_rule_string [ern]); } reg: Assign(addr,reg) 1 { int ern = mono_burg_rule (tree->state, MB_NTERM_reg); printf ("%s\n", mono_burg_rule_string [ern]); } %% the rest is also copied directly to the output /* everything below the second "%%" is also copied directly * to the output file. */ static MBTree * create_tree (int op, MBTree *left, MBTree *right) { MBTree *t = g_new0 (MBTree, 1); t->op = op; t->left = left; t->right = right; return t; } static void reduce (MBTree *tree, int goal) { MBTree *kids[10]; int ern = mono_burg_rule (tree->state, goal); guint16 *nts = mono_burg_nts [ern]; int i, n; mono_burg_kids (tree, ern, kids); // printf ("TEST %d %d %s %d\n", goal, ern, mono_burg_rule_string [ern], nts [0]); for (i = 0; nts [i]; i++) reduce (kids [i], nts [i]); n = (tree->left != NULL) + (tree->right != NULL); if (n) { /* not a terminal */ // printf ("XXTE %s %d\n", mono_burg_rule_string [ern], n); if (mono_burg_func [ern]) mono_burg_func [ern] (tree, NULL); else g_warning ("no code for rule %s\n", mono_burg_rule_string [ern]); } else { if (mono_burg_func [ern]) g_warning ("unused code in rule %s\n", mono_burg_rule_string [ern]); } } int main () { MBTree *t, *l, *r; MBState *s; l = create_tree (MB_TERM_Constant, NULL, NULL); r = create_tree (MB_TERM_Fetch, l, NULL); l = create_tree (MB_TERM_Constant, NULL, NULL); r = create_tree (MB_TERM_Assign, l, r); l = create_tree (MB_TERM_Four, NULL, NULL); r = create_tree (MB_TERM_Mul, l, r); l = create_tree (MB_TERM_Constant, NULL, NULL); l = create_tree (MB_TERM_Plus, l, r); t = create_tree (MB_TERM_Fetch, l, NULL); s = mono_burg_label (t, NULL); g_assert (s); reduce (t, MB_NTERM_reg); return 0; } ++ README (revision 0) This is an implementation of an IBurg like code generator generator. It is based on the papers from Christopher W. Fraser, Robert R. Henry and Todd A. Proebsting: Reference 1: BURG - Fast Optimal Instruction Selection and Tree Parsing Reference 2: Engineering a Simple, Efficient Code Generator Generator Examples: sample.brg ++ bootstrap (revision 0) #!/bin/sh autoreconf -f -v -i -m Index: configure.ac --- configure.ac (revision 0) +++ configure.ac (revision 0) @@ -0,0 +1,46 @@ +## ---------------------------------------------------------------------------- +## Configure MonoBURG, an IBurg-like code generator generator +## + +## ------------------------------------- +## Project +AC_INIT([MonoBURG], [1.0.1]) + +## ------------------------------------- +## Setup autotools + +# Need autoconf 2.57 at least. +AC_PREREQ([2.57]) + +# Auxiliary files. +AC_CONFIG_AUX_DIR([config]) +AC_CONFIG_FILES([config/Makefile]) + +# Initiate automake. +AM_INIT_AUTOMAKE([foreign 1.7.5 dist-bzip2]) + +## ------------------------------------- +## Development tools + +# Look for a C compiler +AC_PROG_CC + +# Look for a yacc-like program +AC_PROG_YACC + +## ------------------------------------- +## Environment + +# Check for GLIB-2.0 presence +AM_PATH_GLIB_2_0 + +## ------------------------------------- +## Epilogue + +# Ask for Makefile creation +AC_CONFIG_FILES([ + Makefile +]) + +# Instantiate the output files +AC_OUTPUT Index: parser.y --- parser.y (revision 0) +++ parser.y (revision 0) @@ -0,0 +1,363 @@ +%{ +/* + * monoburg.y: yacc input grammer + * + * Author: + * Dietmar Maurer (dietmar(a)ximian.com) + * + * (C) 2001 Ximian, Inc. + */ + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> +#include <ctype.h> +#include <assert.h> +#include <stdarg.h> + +#include "monoburg.h" + +static int yylineno = 0; +static int yylinepos = 0; + +%} + +%union { + char *text; + int ivalue; + Tree *tree; + Rule *rule; + GList *rule_list; +} + +%token <text> IDENT +%token <text> CODE +%token <text> STRING +%token START +%token COST +%token TERM +%token TERMPREFIX +%token <ivalue> INTEGER + +%type <tree> tree +%type <text> optcost +%type <text> optcfunc +%type <text> optcode +%type <rule> rule +%type <rule_list> rule_list + +%% + +decls : /* empty */ + | START IDENT { start_nonterm ($2); } decls + | TERM tlist decls + | TERMPREFIX plist decls + | rule_list optcost optcode optcfunc { + GList *tmp; + for (tmp = $1; tmp; tmp = tmp->next) { + rule_add (tmp->data, $3, $2, $4); + } + g_list_free ($1); + } decls + ; + +rule : IDENT ':' tree { $$ = make_rule ($1, $3); } + ; + +rule_list : rule { $$ = g_list_append (NULL, $1); } + | rule ',' rule_list { $$ = g_list_prepend ($3, $1); } + ; + +optcode : /* empty */ { $$ = NULL; } + | CODE + ; + +plist : /* empty */ + | plist IDENT { create_term_prefix ($2);} + ; + +tlist : /* empty */ + | tlist IDENT { create_term ($2, -1);} + | tlist IDENT '=' INTEGER { create_term ($2, $4); } + ; + +tree : IDENT { $$ = create_tree ($1, NULL, NULL); } + | IDENT '(' tree ')' { $$ = create_tree ($1, $3, NULL); } + | IDENT '(' tree ',' tree ')' { $$ = create_tree ($1, $3, $5); } + ; + +optcost : /* empty */ {$$ = NULL; } + | STRING + | INTEGER { $$ = g_strdup_printf ("%d", $1); } + ; + +optcfunc : /*empty */ { $$ = NULL; } + | COST CODE { $$ = $2; } + ; +%% + +static char input[2048]; +static char *next = input; + +void +yyerror (char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + + fprintf (stderr, "line %d(%d): ", yylineno, yylinepos); + vfprintf (stderr, fmt, ap); + fprintf(stderr, "\n"); + + va_end (ap); + + exit (-1); +} + +static int state = 0; + +void +reset_parser () +{ + state = 0; +} + +struct pplist { + struct pplist *next; + gboolean ignore; +}; + +static struct pplist *pp = NULL; + +static char* +getvar (const char *input) +{ + char *var = g_strchug (g_strdup (input)); + char *ptr; + + for (ptr = var; *ptr && *ptr != '\n'; ++ptr) { + if (g_ascii_isspace (*ptr)) { + break; + } + } + *ptr = '\0'; + + return var; +} + +static void +push_if (char *input, gboolean flip) +{ + struct pplist *new_pp = g_new (struct pplist, 1); + char *var = getvar (input); + + new_pp->ignore = (g_hash_table_lookup (definedvars, var) == NULL) ^ flip; + new_pp->next = pp; + + new_pp->ignore |= (pp ? pp->ignore : 0); + pp = new_pp; + g_free (var); +} + +static void +flip_if () +{ + if (!pp) + yyerror ("%%else without %%if"); + + pp->ignore = !pp->ignore | (pp->next ? pp->next->ignore : 0); +} + +static void +pop_if () +{ + struct pplist *prev_pp = pp; + + if (!pp) + yyerror ("%%endif without %%if"); + + pp = pp->next; + g_free (prev_pp); +} + +static char +nextchar () +{ + int next_state ; + gboolean ll; + + if (!*next) { + next = input; + *next = 0; + do { + if (!fgets (input, sizeof (input), inputfd)) + return 0; + + ll = (input [0] == '%' && input [1] == '%'); + next_state = state; + + if (state == 1) { + if (!ll && input [0] == '%') { + if (!strncmp (&input [1], "ifdef", 5)) { + push_if (&input [6], FALSE); + ll = TRUE; + continue; + } + else if (!strncmp (&input [1], "ifndef", 6)) { + push_if (&input [7], TRUE); + ll = TRUE; + continue; + } + else if (!strncmp (&input [1], "else", 4)) { + flip_if (); + ll = TRUE; + continue; + } + else if (!strncmp (&input [1], "endif", 5)) { + pop_if (); + ll = TRUE; + continue; + } + } + if (pp && pp->ignore) { + ll = TRUE; + continue; + } + } + + switch (state) { + case 0: + if (ll) { + next_state = 1; + } else + fputs (input, outputfd); + break; + case 1: + if (ll) { + next_state = 2; + *next = 0; + } + break; + default: + return 0; + } + ll = state != 1 || input[0] == '#'; + state = next_state; + yylineno++; + } while (next_state == 2 || ll); + } + + return *next++; +} + +void +yyparsetail (void) +{ + fputs (input, outputfd); + while (fgets (input, sizeof (input), inputfd)) + fputs (input, outputfd); +} + +int +yylex (void) +{ + char c; + + do { + + if (!(c = nextchar ())) + return 0; + + yylinepos = next - input + 1; + + if (isspace (c)) + continue; + + if (c == '%') { + if (!strncmp (next, "start", 5) && isspace (next[5])) { + next += 5; + return START; + } + + if (!strncmp (next, "termprefix", 10) && isspace (next[10])) { + next += 10; + return TERMPREFIX; + } + + if (!strncmp (next, "term", 4) && isspace (next[4])) { + next += 4; + return TERM; + } + return c; + } + + if (isdigit (c)) { + int num = 0; + + do { + num = 10*num + (c - '0'); + } while (isdigit (c = (*next++))); + + yylval.ivalue = num; + return INTEGER; + } + + if (isalpha (c)) { + char *n = next; + int l; + + if (!strncmp (next - 1, "cost", 4) && isspace (next[3])) { + next += 4; + return COST; + } + + while (isalpha (*n) || isdigit (*n) || *n == '_') + n++; + + l = n - next + 1; + yylval.text = g_strndup (next - 1, l); + next = n; + return IDENT; + } + + if (c == '"') { + int i = 0; + static char buf [100000]; + + while ((c = *next++) != '"' && c) + buf [i++] = c; + + buf [i] = '\0'; + yylval.text = g_strdup (buf); + + return STRING; + } + + if (c == '{') { + int i = 0, d = 1; + static char buf [100000]; + + while (d && (c = nextchar ())) { + buf [i++] = c; + assert (i < sizeof (buf)); + + switch (c) { + case '{': d++; break; + case '}': d--; break; + default: + break; + } + } + buf [--i] = '\0'; + yylval.text = g_strdup (buf); + + return CODE; + } + + return c; + + } while (1); +} + Index: config/Makefile.am --- config/Makefile.am (revision 0) +++ config/Makefile.am (revision 0) @@ -0,0 +1,7 @@ +## Makefile.am -- Process this file with automake to produce Makefile.in +## + +MAINTAINERCLEANFILES = \ + depcomp \ + install-sh \ + missing Index: monoburg.h --- monoburg.h (revision 0) +++ monoburg.h (revision 0) @@ -0,0 +1,72 @@ +#ifndef __MONO_MONOBURG_H__ +#define __MONO_MONOBURG_H__ + +#include <glib.h> + +void yyerror (char *fmt, ...); +int yylex (void); + +extern FILE *inputfd; +extern FILE *outputfd; +extern GHashTable *definedvars; + +typedef struct _Rule Rule; + +typedef struct _Term Term; +struct _Term{ + char *name; + int number; + int arity; + GList *rules; /* rules that start with this terminal */ +}; + +typedef struct _NonTerm NonTerm; + +struct _NonTerm { + char *name; + int number; + GList *rules; /* rules with this nonterm on the left side */ + GList *chain; + gboolean reached; +}; + +typedef struct _Tree Tree; + +struct _Tree { + Term *op; + Tree *left; + Tree *right; + NonTerm *nonterm; /* used by chain rules */ +}; + +struct _Rule { + NonTerm *lhs; + Tree *tree; + char *code; + char *cost; + char *cfunc; +}; + + +Tree *create_tree (char *id, Tree *left, Tree *right); + +Term *create_term (char *id, int num); + +void create_term_prefix (char *id); + +NonTerm *nonterm (char *id); + +void start_nonterm (char *id); + +Rule *make_rule (char *id, Tree *tree); + +void rule_add (Rule *rule, char *code, char *cost, char *cfunc); + +void create_rule (char *id, Tree *tree, char *code, char *cost, + char *cfunc); + +void yyparsetail (void); + +void reset_parser (void); + +#endif