From: Perl 5 Porters <perl5-porters@africa.nicoh.com>
Date: Sun, 7 Jul 1996 06:02:15 +0000 (+0000)
Subject: perl 5.003_01: toke.c
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=89bfa8cdfdb43ad73300693f87de7c1932d342b2;p=p5sagit%2Fp5-mst-13.2.git

perl 5.003_01: toke.c

Add suport for version check via "use"
Add fast symbol lookup support
Optimize subs returning constant value to constants
Change memory allocation calls to use macros from handy.h
Allow \t as well as ' ' between "perl" and switches on #! line
Allow leading '_' under strict subs in barewords stringified as hash keys
#ifdef out under QNX assertion which gives it trouble
---

diff --git a/toke.c b/toke.c
index 5a43c09..f3958c1 100644
--- a/toke.c
+++ b/toke.c
@@ -16,6 +16,7 @@
 
 static void check_uni _((void));
 static void  force_next _((I32 type));
+static char *force_version _((char *start));
 static char *force_word _((char *start, int token, int check_keyword, int allow_pack, int allow_tick));
 static SV *q _((SV *sv));
 static char *scan_const _((char *start));
@@ -45,6 +46,7 @@ static int uni _((I32 f, char *s));
 #endif
 static char * filter_gets _((SV *sv, FILE *fp));
 static void restore_rsfp _((void *f));
+static SV * sub_const _((CV *cv));
 
 /* The following are arranged oddly so that the guard on the switch statement
  * can get by with a single comparison (if the compiler is smart enough).
@@ -515,6 +517,34 @@ int kind;
     }
 }
 
+static char *
+force_version(s)
+char *s;
+{
+    OP *version = Nullop;
+
+    s = skipspace(s);
+
+    /* default VERSION number -- GBARR */
+
+    if(isDIGIT(*s)) {
+        char *d;
+        int c;
+        for( d=s, c = 1; isDIGIT(*d) || (*d == '.' && c--); d++);
+        if((*d == ';' || isSPACE(*d)) && *(skipspace(d)) != ',') {
+            s = scan_num(s);
+            /* real VERSION number -- GBARR */
+            version = yylval.opval;
+        }
+    }
+
+    /* NOTE: The parser sees the package name and the VERSION swapped */
+    nextval[nexttoke].opval = version;
+    force_next(WORD); 
+
+    return (s);
+}
+
 static SV *
 q(sv)
 SV *sv;
@@ -965,7 +995,7 @@ GV *gv;
 	if (indirgv && GvCV(indirgv))
 	    return 0;
 	/* filehandle or package name makes it a method */
-	if (!gv || GvIO(indirgv) || gv_stashpv(tmpbuf, FALSE)) {
+	if (!gv || GvIO(indirgv) || gv_stashpvn(tmpbuf, len, FALSE)) {
 	    s = skipspace(s);
 	    nextval[nexttoke].opval =
 		(OP*)newSVOP(OP_CONST, 0,
@@ -1199,7 +1229,7 @@ yylex()
 		return ')';
 	    }
 	    if (lex_casemods > 10) {
-		char* newlb = (char*)realloc(lex_casestack, lex_casemods + 2);
+		char* newlb = Renew(lex_casestack, lex_casemods + 2, char);
 		if (newlb != lex_casestack) {
 		    SAVEFREEPV(newlb);
 		    lex_casestack = newlb;
@@ -1480,7 +1510,7 @@ yylex()
 		    int oldp = minus_p;
 
 		    while (*d && !isSPACE(*d)) d++;
-		    while (*d == ' ') d++;
+		    while (*d == ' ' || *d == '\t') d++;
 
 		    if (*d++ == '-') {
 			while (d = moreswitches(d)) ;
@@ -1725,7 +1755,7 @@ yylex()
       leftbracket:
 	s++;
 	if (lex_brackets > 100) {
-	    char* newlb = (char*)realloc(lex_brackstack, lex_brackets + 1);
+	    char* newlb = Renew(lex_brackstack, lex_brackets + 1, char);
 	    if (newlb != lex_brackstack) {
 		SAVEFREEPV(newlb);
 		lex_brackstack = newlb;
@@ -1746,7 +1776,7 @@ yylex()
 	case XOPERATOR:
 	    while (s < bufend && (*s == ' ' || *s == '\t'))
 		s++;
-	    if (s < bufend && isALPHA(*s)) {
+	    if (s < bufend && (isALPHA(*s) || *s == '_')) {
 		d = scan_word(s, tokenbuf, FALSE, &len);
 		while (d < bufend && (*d == ' ' || *d == '\t'))
 		    d++;
@@ -2445,6 +2475,17 @@ yylex()
 				tokenbuf, tokenbuf);
 		    last_lop = oldbufptr;
 		    last_lop_op = OP_ENTERSUB;
+		    /* Check for a constant sub */
+		    if (SvPOK(cv) && !SvCUR(cv)) {
+			SV *sv = sub_const(cv);
+			if (sv) {
+			    SvREFCNT_dec(((SVOP*)yylval.opval)->op_sv);
+			    ((SVOP*)yylval.opval)->op_sv = SvREFCNT_inc(sv);
+			    yylval.opval->op_private = 0;
+			    TOKEN(WORD);
+			}
+		    }
+
 		    /* Resolve to GV now. */
 		    op_free(yylval.opval);
 		    yylval.opval = newCVREF(0, newGVOP(OP_GV, 0, gv));
@@ -2944,6 +2985,7 @@ yylex()
 	    if (expect != XSTATE)
 		yyerror("\"no\" not allowed in expression");
 	    s = force_word(s,WORD,FALSE,TRUE,FALSE);
+	    s = force_version(s);
 	    yylval.ival = 0;
 	    OPERATOR(USE);
 
@@ -3059,7 +3101,7 @@ yylex()
 	    *tokenbuf = '\0';
 	    s = force_word(s,WORD,TRUE,TRUE,FALSE);
 	    if (isIDFIRST(*tokenbuf))
-		gv_stashpv(tokenbuf, TRUE);
+		gv_stashpvn(tokenbuf, strlen(tokenbuf), TRUE);
 	    else if (*s == '<')
 		yyerror("<> should be quotes");
 	    UNI(OP_REQUIRE);
@@ -3383,7 +3425,18 @@ yylex()
 	case KEY_use:
 	    if (expect != XSTATE)
 		yyerror("\"use\" not allowed in expression");
-	    s = force_word(s,WORD,FALSE,TRUE,FALSE);
+	    s = skipspace(s);
+	    if(isDIGIT(*s)) {
+		s = force_version(s);
+		if(*s == ';' || (s = skipspace(s), *s == ';')) {
+		    nextval[nexttoke].opval = Nullop;
+		    force_next(WORD);
+		}
+	    }
+	    else {
+		s = force_word(s,WORD,FALSE,TRUE,FALSE);
+		s = force_version(s);
+	    }
 	    yylval.ival = 1;
 	    OPERATOR(USE);
 
@@ -4894,9 +4947,11 @@ start_subparse()
     CV* outsidecv = compcv;
     AV* comppadlist;
 
+#ifndef __QNX__
     if (compcv) {
 	assert(SvTYPE(compcv) == SVt_PVCV);
     }
+#endif
     save_I32(&subline);
     save_item(subname);
     SAVEINT(padix);
@@ -4932,6 +4987,27 @@ start_subparse()
     return oldsavestack_ix;
 }
 
+SV *
+sub_const(cv)
+CV *cv;
+{
+    OP *o;
+    SV *sv = Nullsv;
+    
+    for (o = CvSTART(cv); o; o = o->op_next) {
+	OPCODE type = o->op_type;
+	
+	if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
+	    continue;
+	if (type == OP_LEAVESUB || type == OP_RETURN)
+	    break;
+	if (type != OP_CONST || sv)
+	    return Nullsv;
+	sv = ((SVOP*)o)->op_sv;
+    }
+    return sv;
+}
+
 int
 yywarn(s)
 char *s;