From 40b9920f8fe70e31ce2cd8378db3f2685fafe04e Mon Sep 17 00:00:00 2001
From: bruce <none@none>
Date: Mon, 13 Jul 1987 15:03:27 +0000
Subject: [PATCH] dfa.c now a routine for each state rather than nested switch
 statement

---
 modules/src/em_opt/Makefile    |   6 +-
 modules/src/em_opt/nopt.c      |  18 +++-
 modules/src/em_opt/outputdfa.c | 155 ++++++++++++---------------------
 3 files changed, 76 insertions(+), 103 deletions(-)

diff --git a/modules/src/em_opt/Makefile b/modules/src/em_opt/Makefile
index 14b2ccb7e..e6ffdc48a 100644
--- a/modules/src/em_opt/Makefile
+++ b/modules/src/em_opt/Makefile
@@ -41,7 +41,7 @@ POFILES =	parser.o syntax.o outputdfa.o outcalls.o findworst.o\
 		initlex.o Lpars.o
 
 GENFILES =	Lpars.h Lpars.c parserdummy parser.c syntax.c dfadummy\
-		dfa.c dfa.c.new trans.h trans.h.new trans.c trans.c.new\
+		dfa.c dfa.c.new trans.c trans.c.new\
 		incalls.d incalls.r incalls.r.new pseudo.d
 
 all:		em_nopt $(LIBOPT) em_opt.3
@@ -49,7 +49,7 @@ all:		em_nopt $(LIBOPT) em_opt.3
 install:	all
 		$(INSTALL) lib/$(LIBOPT)
 		$(INSTALL) man/em_opt.3
-		cp em_nopt.1 $(EMHOME)/man
+		cp em_nopt.6 $(EMHOME)/man
 		cp em_nopt $(BINDIR)/em_nopt
 
 cmp:		all
@@ -145,7 +145,7 @@ nopt.o:		nopt.h
 mkstrct.o:	nopt.h
 aux.o:		nopt.h
 pseudo.d:	nopt.h makefuns.awk
-dfa.o:		nopt.h trans.h
+dfa.o:		nopt.h
 trans.o:	nopt.h
 incalls.d:	nopt.h makefuns.awk
 
diff --git a/modules/src/em_opt/nopt.c b/modules/src/em_opt/nopt.c
index 39f1706bb..7e1ced1c1 100644
--- a/modules/src/em_opt/nopt.c
+++ b/modules/src/em_opt/nopt.c
@@ -3,6 +3,8 @@ static char rcsid2[] = "$Header$";
 #endif
 
 #include "nopt.h"
+
+extern int (*OO_fstate[])();	/* Initialized from patterns in dfa.c */
 extern int OO_maxpattern;	/* Initialized from patterns in dfa.c */
 #define MAXBACKUP	50
 #define MAXOUTPUT	200
@@ -61,6 +63,17 @@ O_close()
 	C_close();
 }
 
+OO_dfa(last)
+	register int last;
+{
+	for(;;) {
+		(*OO_fstate[OO_state])(last);
+		if (OO_nxtbackup==OO_bkupqueue)
+			return;
+		last = ((*OO_nxtpatt++ = *(--OO_nxtbackup))->em_opcode);
+	}
+}
+
 PRIVATE
 fatal(s,a)
 	char *s;
@@ -276,10 +289,12 @@ OO_backup(n)
 	}
 }
 
-OO_dodefault(numout, numcopy)
+OO_dodefault(numout, numcopy,newstate)
 	register int numout, numcopy;
+	int newstate;
 {
 	register p_instr *p, *q;
+	OO_pushback(*--OO_nxtpatt);
 	q = (p = OO_patternqueue) + numout;
 	while(numcopy--) {
 		if(numout) {
@@ -290,6 +305,7 @@ OO_dodefault(numout, numcopy)
 	}
 	OO_nxtpatt = p;
 	while(numout--) OO_out(*p++);
+	OO_state = newstate;
 }
 
 #ifdef DEBUG
diff --git a/modules/src/em_opt/outputdfa.c b/modules/src/em_opt/outputdfa.c
index 18fa6a6aa..ffd433ec0 100644
--- a/modules/src/em_opt/outputdfa.c
+++ b/modules/src/em_opt/outputdfa.c
@@ -10,13 +10,7 @@ FILE *ofile;
 outputnopt()
 {
 	openofile("dfa.c");
-	outheaders();
-	outtables();
 	outdfa();
-	outdodefault();
-	installofile();
-	openofile("trans.h");
-	outtranshdr();
 	installofile();
 	openofile("trans.c");
 	outdotrans();
@@ -96,96 +90,71 @@ RENAME(x,y)
 	unlink(x);
 }
 
-PRIVATE
-outheaders()
-{
-	fprintf(ofile,"#include \"nopt.h\"\n");
-	fprintf(ofile,"#include \"trans.h\"\n");
-	fprintf(ofile,"\n");
-	fprintf(ofile,"int OO_maxpattern = %d;\n", longestpattern);
-	fprintf(ofile,"\n");
-}
-
-PRIVATE
-outtables()
-{
-	int s;
-	int nout, ncpy, ngto;
-	fprintf(ofile,"static struct defact {\n");
-	fprintf(ofile,"\tint numoutput;\n");
-	fprintf(ofile,"\tint numcopy;\n");
-	fprintf(ofile,"\tint nextstate;\n");
-	fprintf(ofile,"\tint (*transstate)();\n");
-	fprintf(ofile,"} defaultactions[] = {\n");
-	for(s=0;s<=higheststate;s++) {
-		findfail(s,&nout,&ncpy,&ngto);
-		fprintf(ofile,"\t{%d, %d, %d, ",nout,ncpy,ngto);
-		if(actions[ngto]==NULL)
-			fprintf(ofile,"0");
-		else
-			fprintf(ofile,"OO_%ddotrans",ngto);
-		fprintf(ofile,"},\n");
-	}
-	fprintf(ofile,"};\n");
-	fprintf(ofile,"\n");
-}
-
 PRIVATE
 outdfa()
 {
 	int s;
 	struct idf *op;
 	struct state *p;
+	int nout, ncpy, ngto;
+	int seenswitch;
+	fprintf(ofile,"#include \"nopt.h\"\n");
+	fprintf(ofile,"\n");
+	fprintf(ofile,"int OO_maxpattern = %d;\n", longestpattern);
 	fprintf(ofile,"int OO_state = 0;\n");
 	fprintf(ofile,"\n");
-	fprintf(ofile,"OO_dfa(last) register int last; {\n");
-	fprintf(ofile,"\tfor(;;) {\n");
-	fprintf(ofile,"\t\tswitch(last) {\n");
-	for(op=ops;op!=(struct idf *)NULL;op=op->id_nextidf) {
-		if(!op->id_used)
-			continue;
-		fprintf(ofile,"\t\tcase op_%s:\n",op->id_text);
-		fprintf(ofile,"\t\t\tswitch(OO_state) {\n");
-		if(!op->id_startpatt) {
-				fprintf(ofile,"\t\t\tcase 0: ");
-				fprintf(ofile,"OO_out(*--OO_nxtpatt); ");
-				fprintf(ofile,"break;\n");
-		}
-		for(s=0;s<=higheststate;s++)
-			for(p=states[s];p!=(struct state *)NULL;p=p->next) {
-				if(p->op==op) {
-					fprintf(ofile,"\t\t\tcase %d: ",s);
-					if(actions[p->goto_state]==(struct action *)NULL)
-						fprintf(ofile,"OO_state = %d; ",p->goto_state);
-					else fprintf(ofile,"OO_%ddotrans(); ",p->goto_state);
-					fprintf(ofile,"break;\n");
-				}
-			}
-		fprintf(ofile,"\t\t\tdefault: dodefaultaction(); break;\n");
-		fprintf(ofile,"\t\t\t}\n");
-		fprintf(ofile,"\t\t\tbreak;\n");
+	for(s=0;s<=higheststate;s++) {
+		fprintf(ofile,"static dfa%d();\n",s);
+	}
+	fprintf(ofile,"\nint (*OO_fstate[])()=\n{\n");
+	for(s=0;s<=higheststate;s++) {
+		fprintf(ofile,"\tdfa%d,\n",s);
+	}
+	fprintf(ofile,"};\n\n");
+	for(s=0;s<=higheststate;s++) {
+		fprintf(ofile,"static dfa%d(opcode)\n",s);
+		fprintf(ofile,"\tint opcode;\n");
+		fprintf(ofile,"{\n");
+		seenswitch = 0;
+		for(p=states[s];p!=(struct state *)NULL;p=p->next) {
+			if(!seenswitch) {
+				seenswitch++;
+				fprintf(ofile,"\tswitch(opcode) {\n");
+			}
+			fprintf(ofile,"\tcase op_%s: ",p->op->id_text);
+			if(actions[p->goto_state]==(struct action *)NULL)
+				fprintf(ofile,"OO_state = %d; ",p->goto_state);
+			else fprintf(ofile,"OO_%ddotrans(); ",p->goto_state);
+			fprintf(ofile,"break;\n");
+		}
+		if(s==0) {
+			if(!seenswitch) {
+				seenswitch++;
+				fprintf(ofile,"\tswitch(opcode) {\n");
+			}
+			fprintf(ofile,"\tdefault:\n");
+			fprintf(ofile,"\t\tOO_flush();\n");
+			fprintf(ofile,"\t\tEM_mkcalls(*--OO_nxtpatt);\n");
+			fprintf(ofile,"\t\tOO_free(*OO_nxtpatt);\n");
+			fprintf(ofile,"\t\tbreak;\n");
+			fprintf(ofile,"\tcase OTHER:\n");
+			fprintf(ofile,"\t\tOO_flush();\n");
+			fprintf(ofile,"\t\t--OO_nxtpatt;\n");
+			fprintf(ofile,"\t\tbreak;\n");
+		}
+		else {
+			if(seenswitch) fprintf(ofile,"\tdefault:\n");
+			findfail(s,&nout,&ncpy,&ngto);
+			fprintf(ofile,"\t\tOO_dodefault(%d,%d,%d);\n",
+				nout,ncpy,ngto);
+			if(actions[ngto]!=NULL)
+				fprintf(ofile,"\t\tOO_%ddotrans();\n",ngto);
+			if(seenswitch) fprintf(ofile,"\t\tbreak;\n");
+		}
+		if(seenswitch) fprintf(ofile,"\t}\n");
+		fprintf(ofile,"}\n");
+		fprintf(ofile,"\n");
 	}
-	fprintf(ofile,"\t\tdefault:\n");
-	fprintf(ofile,"\t\t\tif(OO_state) dodefaultaction();\n");
-	fprintf(ofile,"\t\t\telse {\n");
-	fprintf(ofile,"\t\t\t\tOO_flush();\n");
-	fprintf(ofile,"\t\t\t\tEM_mkcalls(*--OO_nxtpatt);\n");
-	fprintf(ofile,"\t\t\t\tOO_free(*OO_nxtpatt);\n");
-	fprintf(ofile,"\t\t\t}\n");
-	fprintf(ofile,"\t\t\tbreak;\n");
-	fprintf(ofile,"\t\tcase OTHER:\n");
-	fprintf(ofile,"\t\t\tif(OO_state) dodefaultaction();\n");
-	fprintf(ofile,"\t\t\telse {\n");
-	fprintf(ofile,"\t\t\t\tOO_flush();\n");
-	fprintf(ofile,"\t\t\t\t--OO_nxtpatt;\n");
-	fprintf(ofile,"\t\t\t}\n");
-	fprintf(ofile,"\t\t\tbreak;\n");
-	fprintf(ofile,"\t\t}\n");
-	fprintf(ofile,"\t\tif (OO_nxtbackup==OO_bkupqueue)\n");
-	fprintf(ofile,"\t\t\treturn;\n");
-	fprintf(ofile,"\t\tlast = ((*OO_nxtpatt++ = *(--OO_nxtbackup))->em_opcode);\n");
-	fprintf(ofile,"\t}\n");
-	fprintf(ofile,"}\n");
 }
 
 PRIVATE
@@ -255,18 +224,6 @@ outdotrans()
 	}
 }
 
-PRIVATE
-outdodefault()
-{
-	fprintf(ofile,"\nstatic dodefaultaction() {\n");
-	fprintf(ofile,"\tregister struct defact *p = &defaultactions[OO_state];\n");
-	fprintf(ofile,"\tOO_pushback(*--OO_nxtpatt);\n");
-	fprintf(ofile,"\tOO_dodefault(p->numoutput,p->numcopy);\n");
-	fprintf(ofile,"\tOO_state=p->nextstate;\n");
-	fprintf(ofile,"\tif(p->transstate) (*(p->transstate))();\n");
-	fprintf(ofile,"}\n");
-}
-
 PRIVATE
 outoneaction(s,a)
 	int s;