diff options
Diffstat (limited to 'lcc/lburg')
| -rwxr-xr-x | lcc/lburg/gram.c | 680 | ||||
| -rwxr-xr-x | lcc/lburg/gram.y | 202 | ||||
| -rwxr-xr-x | lcc/lburg/lburg.1 | 179 | ||||
| -rwxr-xr-x | lcc/lburg/lburg.c | 671 | ||||
| -rwxr-xr-x | lcc/lburg/lburg.h | 65 |
5 files changed, 1797 insertions, 0 deletions
diff --git a/lcc/lburg/gram.c b/lcc/lburg/gram.c new file mode 100755 index 0000000..b484e57 --- /dev/null +++ b/lcc/lburg/gram.c @@ -0,0 +1,680 @@ +#if defined(__STDC__) || defined(__cplusplus)
+#define YYCONST const
+#define YYPARAMS(x) x
+#define YYDEFUN(name, arglist, args) name(args)
+#define YYAND ,
+#define YYPTR void *
+#else
+#define YYCONST
+#define YYPARAMS(x) ()
+#define YYDEFUN(name, arglist, args) name arglist args;
+#define YYAND ;
+#define YYPTR char *
+#endif
+#ifndef lint
+YYCONST static char yysccsid[] = "@(#)yaccpar 1.8 (Berkeley +Cygnus.28) 01/20/91";
+#endif
+#define YYBYACC 1
+#ifndef YYDONT_INCLUDE_STDIO
+#include <stdio.h>
+#endif
+#ifdef __cplusplus
+#include <stdlib.h> /* for malloc/realloc/free */
+#endif
+#line 2 "lburg/gram.y"
+#include <stdio.h>
+#include "lburg.h"
+/*lint -e616 -e527 -e652 -esym(552,yynerrs) -esym(563,yynewstate,yyerrlab) */
+static int yylineno = 0;
+#line 8 "lburg/gram.y"
+typedef union {
+ int n;
+ char *string;
+ Tree tree;
+} YYSTYPE;
+#line 37 "y.tab.c"
+#define TERMINAL 257
+#define START 258
+#define PPERCENT 259
+#define ID 260
+#define TEMPLATE 261
+#define CODE 262
+#define INT 263
+#define YYERRCODE 256
+static YYCONST short yylhs[] = { -1,
+ 0, 0, 4, 4, 6, 6, 6, 6, 7, 7,
+ 5, 5, 5, 5, 1, 3, 3, 3, 2,
+};
+static YYCONST short yylen[] = { 2,
+ 3, 1, 0, 2, 3, 3, 1, 2, 0, 4,
+ 0, 7, 2, 3, 1, 1, 4, 6, 1,
+};
+static YYCONST short yydefred[] = { 3,
+ 0, 0, 0, 9, 0, 11, 7, 4, 8, 0,
+ 15, 0, 0, 0, 5, 6, 0, 13, 0, 0,
+ 14, 0, 10, 0, 0, 0, 0, 0, 19, 0,
+ 17, 0, 12, 0, 18,
+};
+static YYCONST short yydgoto[] = { 1,
+ 12, 30, 25, 2, 13, 8, 10,
+};
+static YYCONST short yysindex[] = { 0,
+ 0, -4, -2, 0, -250, 0, 0, 0, 0, -9,
+ 0, 1, -10, -49, 0, 0, 3, 0, -44, -248,
+ 0, -244, 0, -22, -242, -244, -245, -37, 0, 10,
+ 0, -244, 0, -20, 0,
+};
+static YYCONST short yyrindex[] = { 0,
+ 0, 22, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 23, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, -39, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0,
+};
+static YYCONST short yygindex[] = { 0,
+ 11, 0, -23, 0, 0, 0, 0,
+};
+#define YYTABLESIZE 255
+static YYCONST short yytable[] = { 18,
+ 15, 16, 28, 31, 16, 7, 32, 9, 34, 11,
+ 16, 20, 21, 22, 23, 24, 29, 26, 27, 33,
+ 35, 2, 1, 19, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 16, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 17, 0, 0, 0, 11,
+ 14, 3, 4, 5, 6,
+};
+static YYCONST short yycheck[] = { 10,
+ 10, 41, 26, 41, 44, 10, 44, 10, 32, 260,
+ 10, 61, 10, 58, 263, 260, 262, 40, 261, 10,
+ 41, 0, 0, 13, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, 261, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, 256, -1, -1, -1, 260,
+ 260, 256, 257, 258, 259,
+};
+#define YYFINAL 1
+#ifndef YYDEBUG
+#define YYDEBUG 0
+#endif
+#define YYMAXTOKEN 263
+#if YYDEBUG
+static YYCONST char *YYCONST yyname[] = {
+"end-of-file",0,0,0,0,0,0,0,0,0,"'\\n'",0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,"'('","')'",0,0,"','",0,0,0,0,0,0,0,0,0,0,0,0,0,"':'",0,0,
+"'='",0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+"TERMINAL","START","PPERCENT","ID","TEMPLATE","CODE","INT",
+};
+static YYCONST char *YYCONST yyrule[] = {
+"$accept : spec",
+"spec : decls PPERCENT rules",
+"spec : decls",
+"decls :",
+"decls : decls decl",
+"decl : TERMINAL blist '\\n'",
+"decl : START nonterm '\\n'",
+"decl : '\\n'",
+"decl : error '\\n'",
+"blist :",
+"blist : blist ID '=' INT",
+"rules :",
+"rules : rules nonterm ':' tree TEMPLATE cost '\\n'",
+"rules : rules '\\n'",
+"rules : rules error '\\n'",
+"nonterm : ID",
+"tree : ID",
+"tree : ID '(' tree ')'",
+"tree : ID '(' tree ',' tree ')'",
+"cost : CODE",
+};
+#endif
+#define YYLEX yylex()
+#define YYEMPTY -1
+#define yyclearin (yychar=(YYEMPTY))
+#define yyerrok (yyerrflag=0)
+#ifndef YYINITDEPTH
+#define YYINITDEPTH 200
+#endif
+#ifdef YYSTACKSIZE
+#ifndef YYMAXDEPTH
+#define YYMAXDEPTH YYSTACKSIZE
+#endif
+#else
+#ifdef YYMAXDEPTH
+#define YYSTACKSIZE YYMAXDEPTH
+#else
+#define YYSTACKSIZE 500
+#define YYMAXDEPTH 500
+#endif
+#endif
+#ifndef YYMAXSTACKSIZE
+#define YYMAXSTACKSIZE 10000
+#endif
+int yydebug;
+int yynerrs;
+int yyerrflag;
+int yychar;
+YYSTYPE yyval;
+YYSTYPE yylval;
+static short *yyss;
+static YYSTYPE *yyvs;
+static int yystacksize;
+#define yyfree(x) free(x)
+extern int yylex();
+
+static YYPTR
+YYDEFUN (yymalloc, (bytes), unsigned bytes)
+{
+ YYPTR ptr = (YYPTR) malloc (bytes);
+ if (ptr != 0) return (ptr);
+ yyerror ("yyparse: memory exhausted");
+ return (0);
+}
+
+static YYPTR
+YYDEFUN (yyrealloc, (old, bytes), YYPTR old YYAND unsigned bytes)
+{
+ YYPTR ptr = (YYPTR) realloc (old, bytes);
+ if (ptr != 0) return (ptr);
+ yyerror ("yyparse: memory exhausted");
+ return (0);
+}
+
+static int
+#ifdef __GNUC__
+inline
+#endif
+yygrow ()
+{
+ int old_stacksize = yystacksize;
+ short *new_yyss;
+ YYSTYPE *new_yyvs;
+
+ if (yystacksize == YYMAXSTACKSIZE)
+ return (1);
+ yystacksize += (yystacksize + 1 ) / 2;
+ if (yystacksize > YYMAXSTACKSIZE)
+ yystacksize = YYMAXSTACKSIZE;
+#if YYDEBUG
+ if (yydebug)
+ printf("yydebug: growing stack size from %d to %d\n",
+ old_stacksize, yystacksize);
+#endif
+ new_yyss = (short *) yyrealloc ((char *)yyss, yystacksize * sizeof (short));
+ if (new_yyss == 0)
+ return (1);
+ new_yyvs = (YYSTYPE *) yyrealloc ((char *)yyvs, yystacksize * sizeof (YYSTYPE));
+ if (new_yyvs == 0)
+ {
+ yyfree (new_yyss);
+ return (1);
+ }
+ yyss = new_yyss;
+ yyvs = new_yyvs;
+ return (0);
+}
+#line 60 "lburg/gram.y"
+#include <assert.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <string.h>
+#include <limits.h>
+
+int errcnt = 0;
+FILE *infp = NULL;
+FILE *outfp = NULL;
+static char buf[BUFSIZ], *bp = buf;
+static int ppercent = 0;
+static int code = 0;
+
+static int get(void) {
+ if (*bp == 0) {
+ bp = buf;
+ *bp = 0;
+ if (fgets(buf, sizeof buf, infp) == NULL)
+ return EOF;
+ yylineno++;
+ while (buf[0] == '%' && buf[1] == '{' && buf[2] == '\n') {
+ for (;;) {
+ if (fgets(buf, sizeof buf, infp) == NULL) {
+ yywarn("unterminated %{...%}\n");
+ return EOF;
+ }
+ yylineno++;
+ if (strcmp(buf, "%}\n") == 0)
+ break;
+ fputs(buf, outfp);
+ }
+ if (fgets(buf, sizeof buf, infp) == NULL)
+ return EOF;
+ yylineno++;
+ }
+ }
+ return *bp++;
+}
+
+void yyerror(char *fmt, ...) {
+ va_list ap;
+
+ va_start(ap, fmt);
+ if (yylineno > 0)
+ fprintf(stderr, "line %d: ", yylineno);
+ vfprintf(stderr, fmt, ap);
+ if (fmt[strlen(fmt)-1] != '\n')
+ fprintf(stderr, "\n");
+ errcnt++;
+ va_end(ap);
+}
+
+int yylex(void) {
+ int c;
+
+ if (code) {
+ char *p;
+ bp += strspn(bp, " \t\f");
+ p = strchr(bp, '\n');
+ if (p == NULL)
+ p = strchr(bp, '\n');
+ while (p > bp && isspace(p[-1]))
+ p--;
+ yylval.string = alloc(p - bp + 1);
+ strncpy(yylval.string, bp, p - bp);
+ yylval.string[p - bp] = 0;
+ bp = p;
+ code--;
+ return CODE;
+ }
+ while ((c = get()) != EOF) {
+ switch (c) {
+ case ' ': case '\f': case '\t':
+ continue;
+ case '\n':
+ case '(': case ')': case ',':
+ case ':': case '=':
+ return c;
+ }
+ if (c == '%' && *bp == '%') {
+ bp++;
+ return ppercent++ ? 0 : PPERCENT;
+ } else if (c == '%' && strncmp(bp, "term", 4) == 0
+ && isspace(bp[4])) {
+ bp += 4;
+ return TERMINAL;
+ } else if (c == '%' && strncmp(bp, "start", 5) == 0
+ && isspace(bp[5])) {
+ bp += 5;
+ return START;
+ } else if (c == '"') {
+ char *p = strchr(bp, '"');
+ if (p == NULL) {
+ yyerror("missing \" in assembler template\n");
+ p = strchr(bp, '\n');
+ if (p == NULL)
+ p = strchr(bp, '\0');
+ }
+ assert(p);
+ yylval.string = alloc(p - bp + 1);
+ strncpy(yylval.string, bp, p - bp);
+ yylval.string[p - bp] = 0;
+ bp = *p == '"' ? p + 1 : p;
+ code++;
+ return TEMPLATE;
+ } else if (isdigit(c)) {
+ int n = 0;
+ do {
+ int d = c - '0';
+ if (n > (INT_MAX - d)/10)
+ yyerror("integer greater than %d\n", INT_MAX);
+ else
+ n = 10*n + d;
+ c = get();
+ } while (c != EOF && isdigit(c));
+ bp--;
+ yylval.n = n;
+ return INT;
+ } else if (isalpha(c)) {
+ char *p = bp - 1;
+ while (isalpha(*bp) || isdigit(*bp) || *bp == '_')
+ bp++;
+ yylval.string = alloc(bp - p + 1);
+ strncpy(yylval.string, p, bp - p);
+ yylval.string[bp - p] = 0;
+ return ID;
+ } else if (isprint(c))
+ yyerror("invalid character `%c'\n", c);
+ else
+ yyerror("invalid character `\\%03o'\n", (unsigned char)c);
+ }
+ return 0;
+}
+
+void yywarn(char *fmt, ...) {
+ va_list ap;
+
+ va_start(ap, fmt);
+ if (yylineno > 0)
+ fprintf(stderr, "line %d: ", yylineno);
+ fprintf(stderr, "warning: ");
+ vfprintf(stderr, fmt, ap);
+}
+#line 403 "y.tab.c"
+#define YYABORT goto yyabort
+#define YYACCEPT goto yyaccept
+#define YYERROR goto yyerrlab
+
+#if YYDEBUG
+#ifdef __cplusplus
+extern "C" char *getenv();
+#else
+extern char *getenv();
+#endif
+#endif
+
+int
+yyparse()
+{
+ register int yym, yyn, yystate;
+ register YYSTYPE *yyvsp;
+ register short *yyssp;
+ short *yysse;
+#if YYDEBUG
+ register YYCONST char *yys;
+
+ if (yys = getenv("YYDEBUG"))
+ {
+ yyn = *yys;
+ if (yyn >= '0' && yyn <= '9')
+ yydebug = yyn - '0';
+ }
+#endif
+
+ yynerrs = 0;
+ yyerrflag = 0;
+ yychar = (-1);
+
+ if (yyss == 0)
+ {
+ yyss = (short *) yymalloc (YYSTACKSIZE * sizeof (short));
+ if (yyss == 0)
+ goto yyabort;
+ yyvs = (YYSTYPE *) yymalloc (YYSTACKSIZE * sizeof (YYSTYPE));
+ if (yyvs == 0)
+ {
+ yyfree (yyss);
+ goto yyabort;
+ }
+ yystacksize = YYSTACKSIZE;
+ }
+ yysse = yyss + yystacksize - 1;
+ yyssp = yyss;
+ yyvsp = yyvs;
+ *yyssp = yystate = 0;
+ goto yyloop;
+
+yypush_lex:
+ yyval = yylval;
+ yystate = yytable[yyn];
+yypush:
+ if (yyssp >= yysse)
+ {
+ int depth = yyssp - yyss;
+ if (yygrow() != 0)
+ goto yyoverflow;
+ yysse = yyss + yystacksize -1;
+ yyssp = depth + yyss;
+ yyvsp = depth + yyvs;
+ }
+ *++yyssp = yystate;
+ *++yyvsp = yyval;
+
+yyloop:
+ if (yyn = yydefred[yystate]) goto yyreduce;
+ yyn = yysindex[yystate];
+ if (yychar < 0)
+ {
+ if ((yychar = yylex()) < 0) yychar = 0;
+#if YYDEBUG
+ if (yydebug)
+ {
+ yys = 0;
+ if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
+ if (!yys) yys = "illegal-symbol";
+ printf("yydebug: state %d, reading %d (%s)\n", yystate,
+ yychar, yys);
+ }
+#endif
+ }
+ if (yyn != 0
+ && ((yyn += yychar), ((unsigned)yyn <= (unsigned)YYTABLESIZE))
+ && yycheck[yyn] == yychar)
+ {
+#if YYDEBUG
+ if (yydebug)
+ printf("yydebug: state %d, shifting to state %d\n",
+ yystate, yytable[yyn]);
+#endif
+ if (yyerrflag > 0) --yyerrflag;
+ yychar = (-1);
+ goto yypush_lex;
+ }
+ yyn = yyrindex[yystate];
+ if (yyn != 0
+ && ((yyn += yychar), ((unsigned)yyn <= (unsigned)YYTABLESIZE))
+ && yycheck[yyn] == yychar)
+ {
+ yyn = yytable[yyn];
+ goto yyreduce;
+ }
+ if (yyerrflag) goto yyinrecovery;
+#ifdef lint
+ goto yynewerror;
+#endif
+yynewerror:
+ yyerror("syntax error");
+#ifdef lint
+ goto yyerrlab;
+#endif
+yyerrlab:
+ ++yynerrs;
+yyinrecovery:
+ if (yyerrflag < 3)
+ {
+ yyerrflag = 3;
+ for (;;)
+ {
+ yyn = yysindex[*yyssp];
+ if (yyn != 0
+ && ((yyn += YYERRCODE), ((unsigned)yyn <= (unsigned)YYTABLESIZE))
+ && yycheck[yyn] == YYERRCODE)
+ {
+#if YYDEBUG
+ if (yydebug)
+ printf("yydebug: state %d, error recovery shifting\
+ to state %d\n", *yyssp, yytable[yyn]);
+#endif
+ goto yypush_lex;
+ }
+ else
+ {
+#if YYDEBUG
+ if (yydebug)
+ printf("yydebug: error recovery discarding state %d\n",
+ *yyssp);
+#endif
+ if (yyssp <= yyss) goto yyabort;
+ --yyssp;
+ --yyvsp;
+ }
+ }
+ }
+ else
+ {
+ if (yychar == 0) goto yyabort;
+#if YYDEBUG
+ if (yydebug)
+ {
+ yys = 0;
+ if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
+ if (!yys) yys = "illegal-symbol";
+ printf("yydebug: state %d, error recovery discards token %d (%s)\n",
+ yystate, yychar, yys);
+ }
+#endif
+ yychar = (-1);
+ goto yyloop;
+ }
+yyreduce:
+#if YYDEBUG
+ if (yydebug)
+ printf("yydebug: state %d, reducing by rule %d (%s)\n",
+ yystate, yyn, yyrule[yyn]);
+#endif
+ yym = yylen[yyn];
+ yyval = yyvsp[1-yym];
+ switch (yyn)
+ {
+case 1:
+#line 22 "lburg/gram.y"
+{ yylineno = 0; }
+break;
+case 2:
+#line 23 "lburg/gram.y"
+{ yylineno = 0; }
+break;
+case 6:
+#line 31 "lburg/gram.y"
+{
+ if (nonterm(yyvsp[-1].string)->number != 1)
+ yyerror("redeclaration of the start symbol\n");
+ }
+break;
+case 8:
+#line 36 "lburg/gram.y"
+{ yyerrok; }
+break;
+case 10:
+#line 40 "lburg/gram.y"
+{ term(yyvsp[-2].string, yyvsp[0].n); }
+break;
+case 12:
+#line 44 "lburg/gram.y"
+{ rule(yyvsp[-5].string, yyvsp[-3].tree, yyvsp[-2].string, yyvsp[-1].string); }
+break;
+case 14:
+#line 46 "lburg/gram.y"
+{ yyerrok; }
+break;
+case 15:
+#line 49 "lburg/gram.y"
+{ nonterm(yyval.string = yyvsp[0].string); }
+break;
+case 16:
+#line 52 "lburg/gram.y"
+{ yyval.tree = tree(yyvsp[0].string, 0, 0); }
+break;
+case 17:
+#line 53 "lburg/gram.y"
+{ yyval.tree = tree(yyvsp[-3].string, yyvsp[-1].tree, 0); }
+break;
+case 18:
+#line 54 "lburg/gram.y"
+{ yyval.tree = tree(yyvsp[-5].string, yyvsp[-3].tree, yyvsp[-1].tree); }
+break;
+case 19:
+#line 57 "lburg/gram.y"
+{ if (*yyvsp[0].string == 0) yyval.string = "0"; }
+break;
+#line 630 "y.tab.c"
+ }
+ yyssp -= yym;
+ yyvsp -= yym;
+ yym = yylhs[yyn];
+ yystate = *yyssp;
+ if (yystate == 0 && yym == 0)
+ {
+#if YYDEBUG
+ if (yydebug)
+ printf("yydebug: after reduction, shifting from state 0 to\
+ state %d\n", YYFINAL);
+#endif
+ yystate = YYFINAL;
+ *++yyssp = YYFINAL;
+ *++yyvsp = yyval;
+ if (yychar < 0)
+ {
+ if ((yychar = yylex()) < 0) yychar = 0;
+#if YYDEBUG
+ if (yydebug)
+ {
+ yys = 0;
+ if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
+ if (!yys) yys = "illegal-symbol";
+ printf("yydebug: state %d, reading %d (%s)\n",
+ YYFINAL, yychar, yys);
+ }
+#endif
+ }
+ if (yychar == 0) goto yyaccept;
+ goto yyloop;
+ }
+ yyn = yygindex[yym];
+ if (yyn != 0
+ && ((yyn += yystate), ((unsigned)yyn <= (unsigned)YYTABLESIZE))
+ && yycheck[yyn] == yystate)
+ yystate = yytable[yyn];
+ else
+ yystate = yydgoto[yym];
+#if YYDEBUG
+ if (yydebug)
+ printf("yydebug: after reduction, shifting from state %d \
+to state %d\n", *yyssp, yystate);
+#endif
+ goto yypush;
+yyoverflow:
+ yyerror("yacc stack overflow");
+yyabort:
+ return (1);
+yyaccept:
+ return (0);
+}
diff --git a/lcc/lburg/gram.y b/lcc/lburg/gram.y new file mode 100755 index 0000000..860d22a --- /dev/null +++ b/lcc/lburg/gram.y @@ -0,0 +1,202 @@ +%{
+#include <stdio.h>
+#include "lburg.h"
+static char rcsid[] = "$Id: gram.y 145 2001-10-17 21:53:10Z timo $";
+/*lint -e616 -e527 -e652 -esym(552,yynerrs) -esym(563,yynewstate,yyerrlab) */
+static int yylineno = 0;
+%}
+%union {
+ int n;
+ char *string;
+ Tree tree;
+}
+%term TERMINAL
+%term START
+%term PPERCENT
+
+%token <string> ID TEMPLATE CODE
+%token <n> INT
+%type <string> nonterm cost
+%type <tree> tree
+%%
+spec : decls PPERCENT rules { yylineno = 0; }
+ | decls { yylineno = 0; }
+ ;
+
+decls : /* lambda */
+ | decls decl
+ ;
+
+decl : TERMINAL blist '\n'
+ | START nonterm '\n' {
+ if (nonterm($2)->number != 1)
+ yyerror("redeclaration of the start symbol\n");
+ }
+ | '\n'
+ | error '\n' { yyerrok; }
+ ;
+
+blist : /* lambda */
+ | blist ID '=' INT { term($2, $4); }
+ ;
+
+rules : /* lambda */
+ | rules nonterm ':' tree TEMPLATE cost '\n' { rule($2, $4, $5, $6); }
+ | rules '\n'
+ | rules error '\n' { yyerrok; }
+ ;
+
+nonterm : ID { nonterm($$ = $1); }
+ ;
+
+tree : ID { $$ = tree($1, 0, 0); }
+ | ID '(' tree ')' { $$ = tree($1, $3, 0); }
+ | ID '(' tree ',' tree ')' { $$ = tree($1, $3, $5); }
+ ;
+
+cost : CODE { if (*$1 == 0) $$ = "0"; }
+ ;
+%%
+#include <assert.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <string.h>
+#include <limits.h>
+
+int errcnt = 0;
+FILE *infp = NULL;
+FILE *outfp = NULL;
+static char buf[BUFSIZ], *bp = buf;
+static int ppercent = 0;
+static int code = 0;
+
+static int get(void) {
+ if (*bp == 0) {
+ bp = buf;
+ *bp = 0;
+ if (fgets(buf, sizeof buf, infp) == NULL)
+ return EOF;
+ yylineno++;
+ while (buf[0] == '%' && buf[1] == '{' && buf[2] == '\n') {
+ for (;;) {
+ if (fgets(buf, sizeof buf, infp) == NULL) {
+ yywarn("unterminated %{...%}\n");
+ return EOF;
+ }
+ yylineno++;
+ if (strcmp(buf, "%}\n") == 0)
+ break;
+ fputs(buf, outfp);
+ }
+ if (fgets(buf, sizeof buf, infp) == NULL)
+ return EOF;
+ yylineno++;
+ }
+ }
+ return *bp++;
+}
+
+void yyerror(char *fmt, ...) {
+ va_list ap;
+
+ va_start(ap, fmt);
+ if (yylineno > 0)
+ fprintf(stderr, "line %d: ", yylineno);
+ vfprintf(stderr, fmt, ap);
+ if (fmt[strlen(fmt)-1] != '\n')
+ fprintf(stderr, "\n");
+ errcnt++;
+ va_end(ap);
+}
+
+int yylex(void) {
+ int c;
+
+ if (code) {
+ char *p;
+ bp += strspn(bp, " \t\f");
+ p = strchr(bp, '\n');
+ if (p == NULL)
+ p = strchr(bp, '\n');
+ while (p > bp && isspace(p[-1]))
+ p--;
+ yylval.string = alloc(p - bp + 1);
+ strncpy(yylval.string, bp, p - bp);
+ yylval.string[p - bp] = 0;
+ bp = p;
+ code--;
+ return CODE;
+ }
+ while ((c = get()) != EOF) {
+ switch (c) {
+ case ' ': case '\f': case '\t':
+ continue;
+ case '\n':
+ case '(': case ')': case ',':
+ case ':': case '=':
+ return c;
+ }
+ if (c == '%' && *bp == '%') {
+ bp++;
+ return ppercent++ ? 0 : PPERCENT;
+ } else if (c == '%' && strncmp(bp, "term", 4) == 0
+ && isspace(bp[4])) {
+ bp += 4;
+ return TERMINAL;
+ } else if (c == '%' && strncmp(bp, "start", 5) == 0
+ && isspace(bp[5])) {
+ bp += 5;
+ return START;
+ } else if (c == '"') {
+ char *p = strchr(bp, '"');
+ if (p == NULL) {
+ yyerror("missing \" in assembler template\n");
+ p = strchr(bp, '\n');
+ if (p == NULL)
+ p = strchr(bp, '\0');
+ }
+ assert(p);
+ yylval.string = alloc(p - bp + 1);
+ strncpy(yylval.string, bp, p - bp);
+ yylval.string[p - bp] = 0;
+ bp = *p == '"' ? p + 1 : p;
+ code++;
+ return TEMPLATE;
+ } else if (isdigit(c)) {
+ int n = 0;
+ do {
+ int d = c - '0';
+ if (n > (INT_MAX - d)/10)
+ yyerror("integer greater than %d\n", INT_MAX);
+ else
+ n = 10*n + d;
+ c = get();
+ } while (c != EOF && isdigit(c));
+ bp--;
+ yylval.n = n;
+ return INT;
+ } else if (isalpha(c)) {
+ char *p = bp - 1;
+ while (isalpha(*bp) || isdigit(*bp) || *bp == '_')
+ bp++;
+ yylval.string = alloc(bp - p + 1);
+ strncpy(yylval.string, p, bp - p);
+ yylval.string[bp - p] = 0;
+ return ID;
+ } else if (isprint(c))
+ yyerror("invalid character `%c'\n", c);
+ else
+ yyerror("invalid character `\\%03o'\n", (unsigned char)c);
+ }
+ return 0;
+}
+
+void yywarn(char *fmt, ...) {
+ va_list ap;
+
+ va_start(ap, fmt);
+ if (yylineno > 0)
+ fprintf(stderr, "line %d: ", yylineno);
+ fprintf(stderr, "warning: ");
+ vfprintf(stderr, fmt, ap);
+}
diff --git a/lcc/lburg/lburg.1 b/lcc/lburg/lburg.1 new file mode 100755 index 0000000..d633e6b --- /dev/null +++ b/lcc/lburg/lburg.1 @@ -0,0 +1,179 @@ +.TH LBURG 1 "local \- 11/30/94"
+.\" $Id: lburg.1 145 2001-10-17 21:53:10Z timo $
+.SH NAME
+lburg \- lcc's code-generator generator
+.SH SYNOPSIS
+.B lburg
+[
+.I option
+]...
+[ [
+.I input
+]
+.I output
+]
+.br
+.SH DESCRIPTION
+.PP
+.I lburg
+reads an lcc-style BURG specification from
+.I input
+and writes a pattern-matching code generator to
+.IR output .
+If
+.I input
+is `\-' or is omitted,
+.I lburg
+reads the standard input;
+If
+.I output
+is `\-' or is omitted,
+.I lburg
+writes to the standard output.
+.PP
+.I lburg
+accepts specifications that conform to the following EBNF grammar.
+Terminals are enclosed in single quotes or are
+given in uppercase, all other symbols are nonterminals or English phrases,
+{X} denotes zero or more instances of X, and [X] denotes an optional X.
+.PP
+.nf
+.RS
+.ft CW
+spec: `%{' configuration `%}' { dcl } `%%' { rule }
+ [ `%%' C code ]
+
+dcl: `%start' nonterm
+ `%term' { ID `=' INT }
+
+rule: nonterm `:' tree template [ C expression ]
+
+tree: term `(' tree `,' tree `)'
+ term `(' tree `)'
+ term
+ nonterm
+
+nonterm: ID
+
+template: `"' { any character except double quote } `"'
+.RE
+.fi
+.PP
+Specifications are structurally similar to
+.IR yacc 's.
+Text between
+`\f(CW%{\fP'
+and
+`\f(CW%}\fP'
+is called the configuration section; there may be several such segments.
+All are concatenated and copied verbatim into the head of the output.
+Text after the second
+`\f(CW%%\fP',
+if any, is also copied verbatim into the output, at the end.
+.PP
+Specifications consist of declarations, a
+`\f(CW%%\fP'
+separator, and rules.
+Input is line-oriented; each declaration and rule must appear on a separate line,
+and declarations must begin in column 1.
+Declarations declare terminals \(em the operators in subject
+trees \(em and associate a unique, positive external symbol
+number with each one.
+Nonterminals are declared by their presence
+on the left side of rules. The
+\f(CW%start\fP
+declaration optionally declares a nonterminal as the start symbol.
+In the grammar above,
+\f(CWterm\fP
+and
+\f(CWnonterm\fP
+denote identifiers that are terminals and nonterminals.
+.PP
+Rules define tree patterns in a fully parenthesized prefix
+form. Every nonterminal denotes a tree.
+Each operator has a fixed
+arity, which is inferred from the rules in which it is used.
+A chain rule is a rule whose pattern is another nonterminal.
+If no start symbol is declared, the nonterminal defined by the first rule is used.
+.PP
+Each rule ends with an expression that computes the cost of matching
+that rule; omitted costs
+default to zero. Costs of chain rules must be constants.
+.PP
+The configuration section configures the output
+for the trees being parsed and the client's environment.
+As shown, this section must define
+\f(CWNODEPTR_TYPE\fP
+to be a visible typedef symbol for a pointer to a
+node in the subject tree.
+The labeller invokes
+\f(CWOP_LABEL(p)\fP,
+\f(CWLEFT\_CHILD(p)\fP, and
+\f(CWRIGHT\_CHILD(p)\fP
+to read the operator and children from the node pointed to by \f(CWp\fP.
+If the configuration section defines these operations as macros, they are implemented in-line;
+otherwise, they must be implemented as functions.
+.PP
+The matcher
+computes and stores a single integral state in each node of the subject tree.
+The configuration section must define a macro
+\f(CWSTATE_LABEL(p)\fP
+to access the state field of the node pointed to
+by \f(CWp\fP. It must be large enough to hold a pointer, and
+a macro is required because it is used as an lvalue.
+.PP
+.SH OPTIONS
+.TP
+.BI \-p \ prefix
+.br
+.ns
+.TP
+.BI \-p prefix
+Use
+.I prefix
+as the disambiquating prefix for visible names and fields.
+The default is `\f(CW_\fP'.
+.TP
+.B \-T
+Arrange for
+.sp
+.nf
+.ft CW
+ void _trace(NODEPTR_TYPE p, int eruleno,
+ int cost, int bestcost);
+.sp
+.fi
+.ft R
+to be called at each successful match.
+\f(CWp\fP
+identifies the node and
+\f(CWeruleno\fP
+identifies the matching rule; the rules are numbered
+beginning at 1 in the order they appear in the input.
+\f(CWcost\fP
+is the cost of the match and
+\f(CWbestcost\fP
+is the cost of the best previous match. The current match
+wins only if
+\f(CWcost\fP
+is less than \f(CWbestcost\fP.
+32767 represents the infinite cost of no previous match.
+\f(CW_trace\fP must be declared in the configuration section.
+.SH "SEE ALSO"
+.IR lcc (1)
+.PP
+C. W. Fraser and D. R. Hanson,
+.IR A Retargetable C Compiler: Design and Implementation ,
+Benjamin/Cummings, Redwood City, CA, 1995,
+ISBN 0-8053-1670-1. Chapter 14.
+.PP
+C. W. Fraser, D. R. Hanson and T. A. Proebsting,
+`Engineering a simple, efficient code generator generator,'
+.I
+ACM Letters on Programming Languages and Systems
+.BR 1 ,
+3 (Sep. 1992), 213-226.
+.br
+.SH BUGS
+Mail bug reports along with the shortest input
+that exposes them to drh@cs.princeton.edu.
diff --git a/lcc/lburg/lburg.c b/lcc/lburg/lburg.c new file mode 100755 index 0000000..a34e4e7 --- /dev/null +++ b/lcc/lburg/lburg.c @@ -0,0 +1,671 @@ +#include <assert.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include "lburg.h"
+
+static char rcsid[] = "lburg.c - faked rcsid";
+
+static char *prefix = "";
+static int Tflag = 0;
+static int ntnumber = 0;
+static Nonterm start = 0;
+static Term terms;
+static Nonterm nts;
+static Rule rules;
+static int nrules;
+static struct block {
+ struct block *link;
+} *memlist; /* list of allocated blocks */
+
+static char *stringf(char *fmt, ...);
+static void print(char *fmt, ...);
+static void ckreach(Nonterm p);
+static void emitclosure(Nonterm nts);
+static void emitcost(Tree t, char *v);
+static void emitdefs(Nonterm nts, int ntnumber);
+static void emitheader(void);
+static void emitkids(Rule rules, int nrules);
+static void emitnts(Rule rules, int nrules);
+static void emitrecalc(char *pre, Term root, Term kid);
+static void emitrecord(char *pre, Rule r, char *c, int cost);
+static void emitrule(Nonterm nts);
+static void emitlabel(Term terms, Nonterm start, int ntnumber);
+static void emitstring(Rule rules);
+static void emitstruct(Nonterm nts, int ntnumber);
+static void emittest(Tree t, char *v, char *suffix);
+
+int main(int argc, char *argv[]) {
+ int c, i;
+ Nonterm p;
+
+ for (i = 1; i < argc; i++)
+ if (strcmp(argv[i], "-T") == 0)
+ Tflag = 1;
+ else if (strncmp(argv[i], "-p", 2) == 0 && argv[i][2])
+ prefix = &argv[i][2];
+ else if (strncmp(argv[i], "-p", 2) == 0 && i + 1 < argc)
+ prefix = argv[++i];
+ else if (*argv[i] == '-' && argv[i][1]) {
+ yyerror("usage: %s [-T | -p prefix]... [ [ input ] output ] \n",
+ argv[0]);
+ exit(1);
+ } else if (infp == NULL) {
+ if (strcmp(argv[i], "-") == 0)
+ infp = stdin;
+ else if ((infp = fopen(argv[i], "r")) == NULL) {
+ yyerror("%s: can't read `%s'\n", argv[0], argv[i]);
+ exit(1);
+ }
+ } else if (outfp == NULL) {
+ if (strcmp(argv[i], "-") == 0)
+ outfp = stdout;
+ if ((outfp = fopen(argv[i], "w")) == NULL) {
+ yyerror("%s: can't write `%s'\n", argv[0], argv[i]);
+ exit(1);
+ }
+ }
+ if (infp == NULL)
+ infp = stdin;
+ if (outfp == NULL)
+ outfp = stdout;
+ yyparse();
+ if (start)
+ ckreach(start);
+ for (p = nts; p; p = p->link) {
+ if (p->rules == NULL)
+ yyerror("undefined nonterminal `%s'\n", p->name);
+ if (!p->reached)
+ yyerror("can't reach nonterminal `%s'\n", p->name);
+ }
+ emitheader();
+ emitdefs(nts, ntnumber);
+ emitstruct(nts, ntnumber);
+ emitnts(rules, nrules);
+ emitstring(rules);
+ emitrule(nts);
+ emitclosure(nts);
+ if (start)
+ emitlabel(terms, start, ntnumber);
+ emitkids(rules, nrules);
+ if (!feof(infp))
+ while ((c = getc(infp)) != EOF)
+ putc(c, outfp);
+ while (memlist) { /* for purify */
+ struct block *q = memlist->link;
+ free(memlist);
+ memlist = q;
+ }
+ return errcnt > 0;
+}
+
+/* alloc - allocate nbytes or issue fatal error */
+void *alloc(int nbytes) {
+ struct block *p = calloc(1, sizeof *p + nbytes);
+
+ if (p == NULL) {
+ yyerror("out of memory\n");
+ exit(1);
+ }
+ p->link = memlist;
+ memlist = p;
+ return p + 1;
+}
+
+/* stringf - format and save a string */
+static char *stringf(char *fmt, ...) {
+ va_list ap;
+ char buf[512];
+
+ va_start(ap, fmt);
+ vsprintf(buf, fmt, ap);
+ va_end(ap);
+ return strcpy(alloc(strlen(buf) + 1), buf);
+}
+
+struct entry {
+ union {
+ char *name;
+ struct term t;
+ struct nonterm nt;
+ } sym;
+ struct entry *link;
+} *table[211];
+#define HASHSIZE (sizeof table/sizeof table[0])
+
+/* hash - return hash number for str */
+static unsigned hash(char *str) {
+ unsigned h = 0;
+
+ while (*str)
+ h = (h<<1) + *str++;
+ return h;
+}
+
+/* lookup - lookup symbol name */
+static void *lookup(char *name) {
+ struct entry *p = table[hash(name)%HASHSIZE];
+
+ for ( ; p; p = p->link)
+ if (strcmp(name, p->sym.name) == 0)
+ return &p->sym;
+ return 0;
+}
+
+/* install - install symbol name */
+static void *install(char *name) {
+ struct entry *p = alloc(sizeof *p);
+ int i = hash(name)%HASHSIZE;
+
+ p->sym.name = name;
+ p->link = table[i];
+ table[i] = p;
+ return &p->sym;
+}
+
+/* nonterm - create a new terminal id, if necessary */
+Nonterm nonterm(char *id) {
+ Nonterm p = lookup(id), *q = &nts;
+
+ if (p && p->kind == NONTERM)
+ return p;
+ if (p && p->kind == TERM)
+ yyerror("`%s' is a terminal\n", id);
+ p = install(id);
+ p->kind = NONTERM;
+ p->number = ++ntnumber;
+ if (p->number == 1)
+ start = p;
+ while (*q && (*q)->number < p->number)
+ q = &(*q)->link;
+ assert(*q == 0 || (*q)->number != p->number);
+ p->link = *q;
+ *q = p;
+ return p;
+}
+
+/* term - create a new terminal id with external symbol number esn */
+Term term(char *id, int esn) {
+ Term p = lookup(id), *q = &terms;
+
+ if (p)
+ yyerror("redefinition of terminal `%s'\n", id);
+ else
+ p = install(id);
+ p->kind = TERM;
+ p->esn = esn;
+ p->arity = -1;
+ while (*q && (*q)->esn < p->esn)
+ q = &(*q)->link;
+ if (*q && (*q)->esn == p->esn)
+ yyerror("duplicate external symbol number `%s=%d'\n",
+ p->name, p->esn);
+ p->link = *q;
+ *q = p;
+ return p;
+}
+
+/* tree - create & initialize a tree node with the given fields */
+Tree tree(char *id, Tree left, Tree right) {
+ Tree t = alloc(sizeof *t);
+ Term p = lookup(id);
+ int arity = 0;
+
+ if (left && right)
+ arity = 2;
+ else if (left)
+ arity = 1;
+ if (p == NULL && arity > 0) {
+ yyerror("undefined terminal `%s'\n", id);
+ p = term(id, -1);
+ } else if (p == NULL && arity == 0)
+ p = (Term)nonterm(id);
+ else if (p && p->kind == NONTERM && arity > 0) {
+ yyerror("`%s' is a nonterminal\n", id);
+ p = term(id, -1);
+ }
+ if (p->kind == TERM && p->arity == -1)
+ p->arity = arity;
+ if (p->kind == TERM && arity != p->arity)
+ yyerror("inconsistent arity for terminal `%s'\n", id);
+ t->op = p;
+ t->nterms = p->kind == TERM;
+ if ((t->left = left) != NULL)
+ t->nterms += left->nterms;
+ if ((t->right = right) != NULL)
+ t->nterms += right->nterms;
+ return t;
+}
+
+/* rule - create & initialize a rule with the given fields */
+Rule rule(char *id, Tree pattern, char *template, char *code) {
+ Rule r = alloc(sizeof *r), *q;
+ Term p = pattern->op;
+ char *end;
+
+ r->lhs = nonterm(id);
+ r->packed = ++r->lhs->lhscount;
+ for (q = &r->lhs->rules; *q; q = &(*q)->decode)
+ ;
+ *q = r;
+ r->pattern = pattern;
+ r->ern = ++nrules;
+ r->template = template;
+ r->code = code;
+ r->cost = strtol(code, &end, 10);
+ if (*end) {
+ r->cost = -1;
+ r->code = stringf("(%s)", code);
+ }
+ if (p->kind == TERM) {
+ for (q = &p->rules; *q; q = &(*q)->next)
+ ;
+ *q = r;
+ } else if (pattern->left == NULL && pattern->right == NULL) {
+ Nonterm p = pattern->op;
+ r->chain = p->chain;
+ p->chain = r;
+ if (r->cost == -1)
+ yyerror("illegal nonconstant cost `%s'\n", code);
+ }
+ for (q = &rules; *q; q = &(*q)->link)
+ ;
+ r->link = *q;
+ *q = r;
+ return r;
+}
+
+/* print - formatted output */
+static void print(char *fmt, ...) {
+ va_list ap;
+
+ va_start(ap, fmt);
+ for ( ; *fmt; fmt++)
+ if (*fmt == '%')
+ switch (*++fmt) {
+ case 'd': fprintf(outfp, "%d", va_arg(ap, int)); break;
+ case 's': fputs(va_arg(ap, char *), outfp); break;
+ case 'P': fprintf(outfp, "%s_", prefix); break;
+ case 'T': {
+ Tree t = va_arg(ap, Tree);
+ print("%S", t->op);
+ if (t->left && t->right)
+ print("(%T,%T)", t->left, t->right);
+ else if (t->left)
+ print("(%T)", t->left);
+ break;
+ }
+ case 'R': {
+ Rule r = va_arg(ap, Rule);
+ print("%S: %T", r->lhs, r->pattern);
+ break;
+ }
+ case 'S': fputs(va_arg(ap, Term)->name, outfp); break;
+ case '1': case '2': case '3': case '4': case '5': {
+ int n = *fmt - '0';
+ while (n-- > 0)
+ putc('\t', outfp);
+ break;
+ }
+ default: putc(*fmt, outfp); break;
+ }
+ else
+ putc(*fmt, outfp);
+ va_end(ap);
+}
+
+/* reach - mark all nonterminals in tree t as reachable */
+static void reach(Tree t) {
+ Nonterm p = t->op;
+
+ if (p->kind == NONTERM)
+ if (!p->reached)
+ ckreach(p);
+ if (t->left)
+ reach(t->left);
+ if (t->right)
+ reach(t->right);
+}
+
+/* ckreach - mark all nonterminals reachable from p */
+static void ckreach(Nonterm p) {
+ Rule r;
+
+ p->reached = 1;
+ for (r = p->rules; r; r = r->decode)
+ reach(r->pattern);
+}
+
+/* emitcase - emit one case in function state */
+static void emitcase(Term p, int ntnumber) {
+ Rule r;
+
+ print("%1case %d: /* %S */\n", p->esn, p);
+ switch (p->arity) {
+ case 0: case -1:
+ break;
+ case 1:
+ print("%2%Plabel(LEFT_CHILD(a));\n");
+ break;
+ case 2:
+ print("%2%Plabel(LEFT_CHILD(a));\n");
+ print("%2%Plabel(RIGHT_CHILD(a));\n");
+ break;
+ default: assert(0);
+ }
+ for (r = p->rules; r; r = r->next) {
+ char *indent = "\t\t\0";
+ switch (p->arity) {
+ case 0: case -1:
+ print("%2/* %R */\n", r);
+ if (r->cost == -1) {
+ print("%2c = %s;\n", r->code);
+ emitrecord("\t\t", r, "c", 0);
+ } else
+ emitrecord("\t\t", r, r->code, 0);
+ break;
+ case 1:
+ if (r->pattern->nterms > 1) {
+ print("%2if (%1/* %R */\n", r);
+ emittest(r->pattern->left, "LEFT_CHILD(a)", " ");
+ print("%2) {\n");
+ indent = "\t\t\t";
+ } else
+ print("%2/* %R */\n", r);
+ if (r->pattern->nterms == 2 && r->pattern->left
+ && r->pattern->right == NULL)
+ emitrecalc(indent, r->pattern->op, r->pattern->left->op);
+ print("%sc = ", indent);
+ emitcost(r->pattern->left, "LEFT_CHILD(a)");
+ print("%s;\n", r->code);
+ emitrecord(indent, r, "c", 0);
+ if (indent[2])
+ print("%2}\n");
+ break;
+ case 2:
+ if (r->pattern->nterms > 1) {
+ print("%2if (%1/* %R */\n", r);
+ emittest(r->pattern->left, "LEFT_CHILD(a)",
+ r->pattern->right->nterms ? " && " : " ");
+ emittest(r->pattern->right, "RIGHT_CHILD(a)", " ");
+ print("%2) {\n");
+ indent = "\t\t\t";
+ } else
+ print("%2/* %R */\n", r);
+ print("%sc = ", indent);
+ emitcost(r->pattern->left, "LEFT_CHILD(a)");
+ emitcost(r->pattern->right, "RIGHT_CHILD(a)");
+ print("%s;\n", r->code);
+ emitrecord(indent, r, "c", 0);
+ if (indent[2])
+ print("%2}\n");
+ break;
+ default: assert(0);
+ }
+ }
+ print("%2break;\n");
+}
+
+/* emitclosure - emit the closure functions */
+static void emitclosure(Nonterm nts) {
+ Nonterm p;
+
+ for (p = nts; p; p = p->link)
+ if (p->chain)
+ print("static void %Pclosure_%S(NODEPTR_TYPE, int);\n", p);
+ print("\n");
+ for (p = nts; p; p = p->link)
+ if (p->chain) {
+ Rule r;
+ print("static void %Pclosure_%S(NODEPTR_TYPE a, int c) {\n"
+"%1struct %Pstate *p = STATE_LABEL(a);\n", p);
+ for (r = p->chain; r; r = r->chain)
+ emitrecord("\t", r, "c", r->cost);
+ print("}\n\n");
+ }
+}
+
+/* emitcost - emit cost computation for tree t */
+static void emitcost(Tree t, char *v) {
+ Nonterm p = t->op;
+
+ if (p->kind == TERM) {
+ if (t->left)
+ emitcost(t->left, stringf("LEFT_CHILD(%s)", v));
+ if (t->right)
+ emitcost(t->right, stringf("RIGHT_CHILD(%s)", v));
+ } else
+ print("((struct %Pstate *)(%s->x.state))->cost[%P%S_NT] + ", v, p);
+}
+
+/* emitdefs - emit nonterminal defines and data structures */
+static void emitdefs(Nonterm nts, int ntnumber) {
+ Nonterm p;
+
+ for (p = nts; p; p = p->link)
+ print("#define %P%S_NT %d\n", p, p->number);
+ print("\n");
+ print("static char *%Pntname[] = {\n%10,\n");
+ for (p = nts; p; p = p->link)
+ print("%1\"%S\",\n", p);
+ print("%10\n};\n\n");
+}
+
+/* emitheader - emit initial definitions */
+static void emitheader(void) {
+ time_t timer = time(NULL);
+
+ print("/*\ngenerated at %sby %s\n*/\n", ctime(&timer), rcsid);
+ print("static void %Pkids(NODEPTR_TYPE, int, NODEPTR_TYPE[]);\n");
+ print("static void %Plabel(NODEPTR_TYPE);\n");
+ print("static int %Prule(void*, int);\n\n");
+}
+
+/* computekids - compute paths to kids in tree t */
+static char *computekids(Tree t, char *v, char *bp, int *ip) {
+ Term p = t->op;
+
+ if (p->kind == NONTERM) {
+ sprintf(bp, "\t\tkids[%d] = %s;\n", (*ip)++, v);
+ bp += strlen(bp);
+ } else if (p->arity > 0) {
+ bp = computekids(t->left, stringf("LEFT_CHILD(%s)", v), bp, ip);
+ if (p->arity == 2)
+ bp = computekids(t->right, stringf("RIGHT_CHILD(%s)", v), bp, ip);
+ }
+ return bp;
+}
+
+/* emitkids - emit _kids */
+static void emitkids(Rule rules, int nrules) {
+ int i;
+ Rule r, *rc = alloc((nrules + 1 + 1)*sizeof *rc);
+ char **str = alloc((nrules + 1 + 1)*sizeof *str);
+
+ for (i = 0, r = rules; r; r = r->link) {
+ int j = 0;
+ char buf[1024], *bp = buf;
+ *computekids(r->pattern, "p", bp, &j) = 0;
+ for (j = 0; str[j] && strcmp(str[j], buf); j++)
+ ;
+ if (str[j] == NULL)
+ str[j] = strcpy(alloc(strlen(buf) + 1), buf);
+ r->kids = rc[j];
+ rc[j] = r;
+ }
+ print("static void %Pkids(NODEPTR_TYPE p, int eruleno, NODEPTR_TYPE kids[]) {\n"
+"%1if (!p)\n%2fatal(\"%Pkids\", \"Null tree\\n\", 0);\n"
+"%1if (!kids)\n%2fatal(\"%Pkids\", \"Null kids\\n\", 0);\n"
+"%1switch (eruleno) {\n");
+ for (i = 0; (r = rc[i]) != NULL; i++) {
+ for ( ; r; r = r->kids)
+ print("%1case %d: /* %R */\n", r->ern, r);
+ print("%s%2break;\n", str[i]);
+ }
+ print("%1default:\n%2fatal(\"%Pkids\", \"Bad rule number %%d\\n\", eruleno);\n%1}\n}\n\n");
+}
+
+/* emitlabel - emit label function */
+static void emitlabel(Term terms, Nonterm start, int ntnumber) {
+ int i;
+ Term p;
+
+ print("static void %Plabel(NODEPTR_TYPE a) {\n%1int c;\n"
+"%1struct %Pstate *p;\n\n"
+"%1if (!a)\n%2fatal(\"%Plabel\", \"Null tree\\n\", 0);\n");
+ print("%1STATE_LABEL(a) = p = allocate(sizeof *p, FUNC);\n"
+"%1p->rule._stmt = 0;\n");
+ for (i = 1; i <= ntnumber; i++)
+ print("%1p->cost[%d] =\n", i);
+ print("%20x7fff;\n%1switch (OP_LABEL(a)) {\n");
+ for (p = terms; p; p = p->link)
+ emitcase(p, ntnumber);
+ print("%1default:\n"
+"%2fatal(\"%Plabel\", \"Bad terminal %%d\\n\", OP_LABEL(a));\n%1}\n}\n\n");
+}
+
+/* computents - fill in bp with _nts vector for tree t */
+static char *computents(Tree t, char *bp) {
+ if (t) {
+ Nonterm p = t->op;
+ if (p->kind == NONTERM) {
+ sprintf(bp, "%s_%s_NT, ", prefix, p->name);
+ bp += strlen(bp);
+ } else
+ bp = computents(t->right, computents(t->left, bp));
+ }
+ return bp;
+}
+
+/* emitnts - emit _nts ragged array */
+static void emitnts(Rule rules, int nrules) {
+ Rule r;
+ int i, j, *nts = alloc((nrules + 1)*sizeof *nts);
+ char **str = alloc((nrules + 1)*sizeof *str);
+
+ for (i = 0, r = rules; r; r = r->link) {
+ char buf[1024];
+ *computents(r->pattern, buf) = 0;
+ for (j = 0; str[j] && strcmp(str[j], buf); j++)
+ ;
+ if (str[j] == NULL) {
+ print("static short %Pnts_%d[] = { %s0 };\n", j, buf);
+ str[j] = strcpy(alloc(strlen(buf) + 1), buf);
+ }
+ nts[i++] = j;
+ }
+ print("\nstatic short *%Pnts[] = {\n");
+ for (i = j = 0, r = rules; r; r = r->link) {
+ for ( ; j < r->ern; j++)
+ print("%10,%1/* %d */\n", j);
+ print("%1%Pnts_%d,%1/* %d */\n", nts[i++], j++);
+ }
+ print("};\n\n");
+}
+
+/* emitrecalc - emit code that tests for recalculation of INDIR?(VREGP) */
+static void emitrecalc(char *pre, Term root, Term kid) {
+ if (root->kind == TERM && strncmp(root->name, "INDIR", 5) == 0
+ && kid->kind == TERM && strcmp(kid->name, "VREGP" ) == 0) {
+ Nonterm p;
+ print("%sif (mayrecalc(a)) {\n", pre);
+ print("%s%1struct %Pstate *q = a->syms[RX]->u.t.cse->x.state;\n", pre);
+ for (p = nts; p; p = p->link) {
+ print("%s%1if (q->cost[%P%S_NT] == 0) {\n", pre, p);
+ print("%s%2p->cost[%P%S_NT] = 0;\n", pre, p);
+ print("%s%2p->rule.%P%S = q->rule.%P%S;\n", pre, p, p);
+ print("%s%1}\n", pre);
+ }
+ print("%s}\n", pre);
+ }
+}
+
+/* emitrecord - emit code that tests for a winning match of rule r */
+static void emitrecord(char *pre, Rule r, char *c, int cost) {
+ if (Tflag)
+ print("%s%Ptrace(a, %d, %s + %d, p->cost[%P%S_NT]);\n",
+ pre, r->ern, c, cost, r->lhs);
+ print("%sif (", pre);
+ print("%s + %d < p->cost[%P%S_NT]) {\n"
+"%s%1p->cost[%P%S_NT] = %s + %d;\n%s%1p->rule.%P%S = %d;\n",
+ c, cost, r->lhs, pre, r->lhs, c, cost, pre, r->lhs,
+ r->packed);
+ if (r->lhs->chain)
+ print("%s%1%Pclosure_%S(a, %s + %d);\n", pre, r->lhs, c, cost);
+ print("%s}\n", pre);
+}
+
+/* emitrule - emit decoding vectors and _rule */
+static void emitrule(Nonterm nts) {
+ Nonterm p;
+
+ for (p = nts; p; p = p->link) {
+ Rule r;
+ print("static short %Pdecode_%S[] = {\n%10,\n", p);
+ for (r = p->rules; r; r = r->decode)
+ print("%1%d,\n", r->ern);
+ print("};\n\n");
+ }
+ print("static int %Prule(void *state, int goalnt) {\n"
+"%1if (goalnt < 1 || goalnt > %d)\n%2fatal(\"%Prule\", \"Bad goal nonterminal %%d\\n\", goalnt);\n"
+"%1if (!state)\n%2return 0;\n%1switch (goalnt) {\n", ntnumber);
+ for (p = nts; p; p = p->link)
+ print("%1case %P%S_NT:"
+"%1return %Pdecode_%S[((struct %Pstate *)state)->rule.%P%S];\n", p, p, p);
+ print("%1default:\n%2fatal(\"%Prule\", \"Bad goal nonterminal %%d\\n\", goalnt);\n%2return 0;\n%1}\n}\n\n");
+}
+
+/* emitstring - emit arrays of templates, instruction flags, and rules */
+static void emitstring(Rule rules) {
+ Rule r;
+
+ print("static char *%Ptemplates[] = {\n");
+ print("/* 0 */%10,\n");
+ for (r = rules; r; r = r->link)
+ print("/* %d */%1\"%s\",%1/* %R */\n", r->ern, r->template, r);
+ print("};\n");
+ print("\nstatic char %Pisinstruction[] = {\n");
+ print("/* 0 */%10,\n");
+ for (r = rules; r; r = r->link) {
+ int len = strlen(r->template);
+ print("/* %d */%1%d,%1/* %s */\n", r->ern,
+ len >= 2 && r->template[len-2] == '\\' && r->template[len-1] == 'n',
+ r->template);
+ }
+ print("};\n");
+ print("\nstatic char *%Pstring[] = {\n");
+ print("/* 0 */%10,\n");
+ for (r = rules; r; r = r->link)
+ print("/* %d */%1\"%R\",\n", r->ern, r);
+ print("};\n\n");
+}
+
+/* emitstruct - emit the definition of the state structure */
+static void emitstruct(Nonterm nts, int ntnumber) {
+ print("struct %Pstate {\n%1short cost[%d];\n%1struct {\n", ntnumber + 1);
+ for ( ; nts; nts = nts->link) {
+ int n = 1, m = nts->lhscount;
+ while ((m >>= 1) != 0)
+ n++;
+ print("%2unsigned int %P%S:%d;\n", nts, n);
+ }
+ print("%1} rule;\n};\n\n");
+}
+
+/* emittest - emit clause for testing a match */
+static void emittest(Tree t, char *v, char *suffix) {
+ Term p = t->op;
+
+ if (p->kind == TERM) {
+ print("%3%s->op == %d%s/* %S */\n", v, p->esn,
+ t->nterms > 1 ? " && " : suffix, p);
+ if (t->left)
+ emittest(t->left, stringf("LEFT_CHILD(%s)", v),
+ t->right && t->right->nterms ? " && " : suffix);
+ if (t->right)
+ emittest(t->right, stringf("RIGHT_CHILD(%s)", v), suffix);
+ }
+}
diff --git a/lcc/lburg/lburg.h b/lcc/lburg/lburg.h new file mode 100755 index 0000000..238fe98 --- /dev/null +++ b/lcc/lburg/lburg.h @@ -0,0 +1,65 @@ +#ifndef BURG_INCLUDED
+#define BURG_INCLUDED
+
+/* iburg.c: */
+extern void *alloc(int nbytes);
+
+typedef enum { TERM=1, NONTERM } Kind;
+typedef struct rule *Rule;
+typedef struct term *Term;
+struct term { /* terminals: */
+ char *name; /* terminal name */
+ Kind kind; /* TERM */
+ int esn; /* external symbol number */
+ int arity; /* operator arity */
+ Term link; /* next terminal in esn order */
+ Rule rules; /* rules whose pattern starts with term */
+};
+
+typedef struct nonterm *Nonterm;
+struct nonterm { /* nonterminals: */
+ char *name; /* nonterminal name */
+ Kind kind; /* NONTERM */
+ int number; /* identifying number */
+ int lhscount; /* # times nt appears in a rule lhs */
+ int reached; /* 1 iff reached from start nonterminal */
+ Rule rules; /* rules w/nonterminal on lhs */
+ Rule chain; /* chain rules w/nonterminal on rhs */
+ Nonterm link; /* next terminal in number order */
+};
+extern Nonterm nonterm(char *id);
+extern Term term(char *id, int esn);
+
+typedef struct tree *Tree;
+struct tree { /* tree patterns: */
+ void *op; /* a terminal or nonterminal */
+ Tree left, right; /* operands */
+ int nterms; /* number of terminal nodes in this tree */
+};
+extern Tree tree(char *op, Tree left, Tree right);
+
+struct rule { /* rules: */
+ Nonterm lhs; /* lefthand side nonterminal */
+ Tree pattern; /* rule pattern */
+ int ern; /* external rule number */
+ int packed; /* packed external rule number */
+ int cost; /* cost, if a constant */
+ char *code; /* cost, if an expression */
+ char *template; /* assembler template */
+ Rule link; /* next rule in ern order */
+ Rule next; /* next rule with same pattern root */
+ Rule chain; /* next chain rule with same rhs */
+ Rule decode; /* next rule with same lhs */
+ Rule kids; /* next rule with same _kids pattern */
+};
+extern Rule rule(char *id, Tree pattern, char *template, char *code);
+
+/* gram.y: */
+void yyerror(char *fmt, ...);
+int yyparse(void);
+void yywarn(char *fmt, ...);
+extern int errcnt;
+extern FILE *infp;
+extern FILE *outfp;
+
+#endif
|