From 0e396816210c4418be20dc97e0b9d185c6b49913 Mon Sep 17 00:00:00 2001
From: ceriel <none@none>
Date: Mon, 24 Mar 1986 17:29:57 +0000
Subject: [PATCH] some improvements

---
 lang/m2/comp/LLlex.c  | 172 ++++++++++++++++++++----------------------
 lang/m2/comp/LLlex.h  |   1 +
 lang/m2/comp/Makefile |   7 +-
 lang/m2/comp/declar.g |   6 +-
 lang/m2/comp/main.c   |   2 +-
 5 files changed, 94 insertions(+), 94 deletions(-)

diff --git a/lang/m2/comp/LLlex.c b/lang/m2/comp/LLlex.c
index 7380c3fed..17c92ad2c 100644
--- a/lang/m2/comp/LLlex.c
+++ b/lang/m2/comp/LLlex.c
@@ -10,37 +10,97 @@
 #include "LLlex.h"
 
 long str2long();
-char *GetString();
 
 struct token dot, aside;
 
 static char *RcsId = "$Header$";
 
+/*	Skip Modula-2 like comment (* ... *).
+	Note that comment may be nested.
+*/
+static
+SkipComment()
+{
+	register int ch;
+	register int NestLevel = 0;
+
+	LoadChar(ch);
+	for (;;) {
+		if (class(ch) == STNL) {
+			LineNumber++;
+		}
+		else
+		if (ch == '(') {
+			LoadChar(ch);
+			if (ch == '*') {
+				++NestLevel;
+			}
+			else {
+				continue;
+			}
+		}
+		else
+		if (ch == '*') {
+			LoadChar(ch);
+			if (ch == ')') {
+				if (NestLevel-- == 0) {
+					return;
+				}
+			}
+			else {
+				continue;
+			}
+		}
+		LoadChar(ch);
+	}
+}
+
+static char *
+GetString(upto)
+{
+	register int ch;
+	int str_size;
+	char *str = Malloc(str_size = 32);
+	register int pos = 0;
+	
+	LoadChar(ch);
+	while (ch != upto)	{
+		if (class(ch) == STNL)	{
+			lexerror("newline in string");
+			LineNumber++;
+			break;
+		}
+		if (ch == EOI) {
+			lexerror("end-of-file in string");
+			break;
+		}
+		str[pos++] = ch;
+		if (pos == str_size)	{
+			str = Srealloc(str, str_size += 8);
+		}
+		LoadChar(ch);
+	}
+	str[pos] = '\0';
+	return str;
+}
+
+/*	LLlex() plays the role of Lexical Analyzer for the parser.
+	The putting aside of tokens is taken into account.
+*/
 int
 LLlex()
 {
-	/*	LLlex() plays the role of Lexical Analyzer for the parser.
-		The putting aside of tokens is taken into account.
-	*/
-	if (ASIDE)	{	/* a token is put aside		*/
-		dot = aside;
-		ASIDE = 0;
-	}
-	else	{
-		GetToken(&dot);
-		if (DOT == EOI) DOT = -1;
-	}
-
-	return DOT;
-}
-
-int
-GetToken(tk)
-	register struct token *tk;
-{
+	register struct token *tk = &dot;
 	char buf[(IDFSIZE > NUMSIZE ? IDFSIZE : NUMSIZE) + 1];
 	register int ch, nch;
 
+	if (ASIDE)	{	/* a token is put aside		*/
+		*tk = aside;
+		ASIDE = 0;
+		return tk->tk_symb;
+	}
+	tk->tk_lineno = LineNumber;
+
 again:
 	LoadChar(ch);
 	if ((ch & 0200) && ch != EOI) {
@@ -54,6 +114,7 @@ again:
 
 	case STNL:
 		LineNumber++;
+		tk->tk_lineno++;
 		goto again;
 
 	case STGARB:
@@ -305,79 +366,12 @@ Sdec:
 	}
 
 	case STEOI:
-		return tk->tk_symb = EOI;
+		return tk->tk_symb = -1;
 
 	case STCHAR:
 	default:
 		crash("bad character class %d", class(ch));
 	}
+	/*NOTREACHED*/
 }
 
-char *
-GetString(upto)
-{
-	register int ch;
-	int str_size;
-	char *str = Malloc(str_size = 32);
-	register int pos = 0;
-	
-	LoadChar(ch);
-	while (ch != upto)	{
-		if (class(ch) == STNL)	{
-			lexerror("newline in string");
-			LineNumber++;
-			break;
-		}
-		if (ch == EOI) {
-			lexerror("end-of-file in string");
-			break;
-		}
-		str[pos++] = ch;
-		if (pos == str_size)	{
-			str = Srealloc(str, str_size += 8);
-		}
-		LoadChar(ch);
-	}
-	str[pos] = '\0';
-	return str;
-}
-
-SkipComment()
-{
-	/*	Skip Modula-2 like comment (* ... *).
-		Note that comment may be nested.
-	*/
-
-	register int ch;
-	register int NestLevel = 0;
-
-	LoadChar(ch);
-	for (;;) {
-		if (class(ch) == STNL) {
-			LineNumber++;
-		}
-		else
-		if (ch == '(') {
-			LoadChar(ch);
-			if (ch == '*') {
-				++NestLevel;
-			}
-			else {
-				continue;
-			}
-		}
-		else
-		if (ch == '*') {
-			LoadChar(ch);
-			if (ch == ')') {
-				if (NestLevel-- == 0) {
-					return;
-				}
-			}
-			else {
-				continue;
-			}
-		}
-		LoadChar(ch);
-	}
-}
diff --git a/lang/m2/comp/LLlex.h b/lang/m2/comp/LLlex.h
index e6a2dd810..594a0cf52 100644
--- a/lang/m2/comp/LLlex.h
+++ b/lang/m2/comp/LLlex.h
@@ -4,6 +4,7 @@
 
 struct token	{
 	int tk_symb;		/* token itself	*/
+	int tk_lineno;		/* linenumber on which it occurred */
 	union {
 		struct idf *tk_idf;	/* IDENT	*/
 		char *tk_str;		/* STRING	*/
diff --git a/lang/m2/comp/Makefile b/lang/m2/comp/Makefile
index c367db296..e0c745953 100644
--- a/lang/m2/comp/Makefile
+++ b/lang/m2/comp/Makefile
@@ -4,12 +4,13 @@
 HDIR =	../../em/h
 PKGDIR =	../../em/pkg
 LIBDIR =	../../em/lib
-INCLUDES = -I$(HDIR) -I$(PKGDIR) -I/user1/erikb/h
+INCLUDES = -I$(HDIR) -I$(PKGDIR) -I/user1/erikb/em/h
 LSRC =	tokenfile.g program.g declar.g expression.g statement.g
 CC =	cc
 GEN =	LLgen
 GENOPTIONS =
-CFLAGS =	-DDEBUG -O $(INCLUDES)
+CFLAGS =	-DDEBUG -p $(INCLUDES)
+LFLAGS =	-p
 LOBJ =	tokenfile.o program.o declar.o expression.o statement.o
 COBJ =	LLlex.o LLmessage.o char.o error.o main.o \
 	symbol2str.o tokenname.o idf.o input.o idlist.o
@@ -27,7 +28,7 @@ LLfiles:	$(LSRC)
 	@touch LLfiles
 
 main:	$(OBJ) Makefile
-	$(CC) $(LFLAGS) $(OBJ) $(LIBDIR)/libcomp.a /user1/erikb/em/lib/libstr.a /user1/erikb/lib/libsystem.a -o main
+	$(CC) $(LFLAGS) $(OBJ) $(LIBDIR)/libcomp.a $(LIBDIR)/malloc.o /user1/erikb/em/lib/libstr.a /user1/erikb/em/lib/libsystem.a -o main
 	size main
 
 clean:
diff --git a/lang/m2/comp/declar.g b/lang/m2/comp/declar.g
index f1f77a05d..c3cc67c9d 100644
--- a/lang/m2/comp/declar.g
+++ b/lang/m2/comp/declar.g
@@ -177,5 +177,9 @@ VariableDeclaration
 {
 	struct id_list *VarList;
 } :
-	IdentList(&VarList) ':' type
+	IdentList(&VarList)
+	[
+		ConstExpression
+	]?
+	':' type
 ;
diff --git a/lang/m2/comp/main.c b/lang/m2/comp/main.c
index ba0b0b970..b0cfbc3f6 100644
--- a/lang/m2/comp/main.c
+++ b/lang/m2/comp/main.c
@@ -9,7 +9,7 @@
 #include "LLlex.h"
 #include "Lpars.h"
 
-static char *RcsId = "$Header:";
+static char *RcsId = "$Header$";
 
 char options[128];
 char *ProgName;