import the Slacker's QVM code base

1 files changed, 370 insertions, 0 deletions

diff --git a/src/tools/lcc/cpp/tokens.c b/src/tools/lcc/cpp/tokens.c
new file mode 100644
index 0000000..147569b
--- /dev/null
+++ b/src/tools/lcc/cpp/tokens.c
@@ -0,0 +1,370 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cpp.h"
+
+static char wbuf[2*OBS];
+static char *wbp = wbuf;
+
+/*
+ * 1 for tokens that don't need whitespace when they get inserted
+ * by macro expansion
+ */
+static const char wstab[] = {
+	0,	/* END */
+	0,	/* UNCLASS */
+	0,	/* NAME */
+	0,	/* NUMBER */
+	0,	/* STRING */
+	0,	/* CCON */
+	1,	/* NL */
+	0,	/* WS */
+	0,	/* DSHARP */
+	0,	/* EQ */
+	0,	/* NEQ */
+	0,	/* LEQ */
+	0,	/* GEQ */
+	0,	/* LSH */
+	0,	/* RSH */
+	0,	/* LAND */
+	0,	/* LOR */
+	0,	/* PPLUS */
+	0,	/* MMINUS */
+	0,	/* ARROW */
+	1,	/* SBRA */
+	1,	/* SKET */
+	1,	/* LP */
+	1,	/* RP */
+	0,	/* DOT */
+	0,	/* AND */
+	0,	/* STAR */
+	0,	/* PLUS */
+	0,	/* MINUS */
+	0,	/* TILDE */
+	0,	/* NOT */
+	0,	/* SLASH */
+	0,	/* PCT */
+	0,	/* LT */
+	0,	/* GT */
+	0,	/* CIRC */
+	0,	/* OR */
+	0,	/* QUEST */
+	0,	/* COLON */
+	0,	/* ASGN */
+	1,	/* COMMA */
+	0,	/* SHARP */
+	1,	/* SEMIC */
+	1,	/* CBRA */
+	1,	/* CKET */
+	0,	/* ASPLUS */
+ 	0,	/* ASMINUS */
+ 	0,	/* ASSTAR */
+ 	0,	/* ASSLASH */
+ 	0,	/* ASPCT */
+ 	0,	/* ASCIRC */
+ 	0,	/* ASLSH */
+	0,	/* ASRSH */
+ 	0,	/* ASOR */
+ 	0,	/* ASAND */
+	0,	/* ELLIPS */
+	0,	/* DSHARP1 */
+	0,	/* NAME1 */
+	0,	/* DEFINED */
+	0,	/* UMINUS */
+};
+
+void
+maketokenrow(int size, Tokenrow *trp)
+{
+	trp->max = size;
+	if (size>0)
+		trp->bp = (Token *)domalloc(size*sizeof(Token));
+	else
+		trp->bp = NULL;
+	trp->tp = trp->bp;
+	trp->lp = trp->bp;
+}
+
+Token *
+growtokenrow(Tokenrow *trp)
+{
+	int ncur = trp->tp - trp->bp;
+	int nlast = trp->lp - trp->bp;
+
+	trp->max = 3*trp->max/2 + 1;
+	trp->bp = (Token *)realloc(trp->bp, trp->max*sizeof(Token));
+	if (trp->bp == NULL)
+		error(FATAL, "Out of memory from realloc");
+	trp->lp = &trp->bp[nlast];
+	trp->tp = &trp->bp[ncur];
+	return trp->lp;
+}
+
+/*
+ * Compare a row of tokens, ignoring the content of WS; return !=0 if different
+ */
+int
+comparetokens(Tokenrow *tr1, Tokenrow *tr2)
+{
+	Token *tp1, *tp2;
+
+	tp1 = tr1->tp;
+	tp2 = tr2->tp;
+	if (tr1->lp-tp1 != tr2->lp-tp2)
+		return 1;
+	for (; tp1<tr1->lp ; tp1++, tp2++) {
+		if (tp1->type != tp2->type
+		 || (tp1->wslen==0) != (tp2->wslen==0)
+		 || tp1->len != tp2->len
+		 || strncmp((char*)tp1->t, (char*)tp2->t, tp1->len)!=0)
+			return 1;
+	}
+	return 0;
+}
+
+/*
+ * replace ntok tokens starting at dtr->tp with the contents of str.
+ * tp ends up pointing just beyond the replacement.
+ * Canonical whitespace is assured on each side.
+ */
+void
+insertrow(Tokenrow *dtr, int ntok, Tokenrow *str)
+{
+	int nrtok = rowlen(str);
+
+	dtr->tp += ntok;
+	adjustrow(dtr, nrtok-ntok);
+	dtr->tp -= ntok;
+	movetokenrow(dtr, str);
+	makespace(dtr);
+	dtr->tp += nrtok;
+	makespace(dtr);
+}
+
+/*
+ * make sure there is WS before trp->tp, if tokens might merge in the output
+ */
+void
+makespace(Tokenrow *trp)
+{
+	uchar *tt;
+	Token *tp = trp->tp;
+
+	if (tp >= trp->lp)
+		return;
+	if (tp->wslen) {
+		if (tp->flag&XPWS
+		 && (wstab[tp->type] || (trp->tp>trp->bp && wstab[(tp-1)->type]))) {
+			tp->wslen = 0;
+			return;
+		}
+		tp->t[-1] = ' ';
+		return;
+	}
+	if (wstab[tp->type] || (trp->tp>trp->bp && wstab[(tp-1)->type]))
+		return;
+	tt = newstring(tp->t, tp->len, 1);
+	*tt++ = ' ';
+	tp->t = tt;
+	tp->wslen = 1;
+	tp->flag |= XPWS;
+}
+
+/*
+ * Copy an entire tokenrow into another, at tp.
+ * It is assumed that there is enough space.
+ *  Not strictly conforming.
+ */
+void
+movetokenrow(Tokenrow *dtr, Tokenrow *str)
+{
+	int nby;
+
+	/* nby = sizeof(Token) * (str->lp - str->bp); */
+	nby = (char *)str->lp - (char *)str->bp;
+	memmove(dtr->tp, str->bp, nby);
+}
+
+/*
+ * Move the tokens in a row, starting at tr->tp, rightward by nt tokens;
+ * nt may be negative (left move).
+ * The row may need to be grown.
+ * Non-strictly conforming because of the (char *), but easily fixed
+ */
+void
+adjustrow(Tokenrow *trp, int nt)
+{
+	int nby, size;
+
+	if (nt==0)
+		return;
+	size = (trp->lp - trp->bp) + nt;
+	while (size > trp->max)
+		growtokenrow(trp);
+	/* nby = sizeof(Token) * (trp->lp - trp->tp); */
+	nby = (char *)trp->lp - (char *)trp->tp;
+	if (nby)
+		memmove(trp->tp+nt, trp->tp, nby);
+	trp->lp += nt;
+}
+
+/*
+ * Copy a row of tokens into the destination holder, allocating
+ * the space for the contents.  Return the destination.
+ */
+Tokenrow *
+copytokenrow(Tokenrow *dtr, Tokenrow *str)
+{
+	int len = rowlen(str);
+
+	maketokenrow(len, dtr);
+	movetokenrow(dtr, str);
+	dtr->lp += len;
+	return dtr;
+}
+
+/*
+ * Produce a copy of a row of tokens.  Start at trp->tp.
+ * The value strings are copied as well.  The first token
+ * has WS available.
+ */
+Tokenrow *
+normtokenrow(Tokenrow *trp)
+{
+	Token *tp;
+	Tokenrow *ntrp = new(Tokenrow);
+	int len;
+
+	len = trp->lp - trp->tp;
+	if (len<=0)
+		len = 1;
+	maketokenrow(len, ntrp);
+	for (tp=trp->tp; tp < trp->lp; tp++) {
+		*ntrp->lp = *tp;
+		if (tp->len) {
+			ntrp->lp->t = newstring(tp->t, tp->len, 1);
+			*ntrp->lp->t++ = ' ';
+			if (tp->wslen)
+				ntrp->lp->wslen = 1;
+		}
+		ntrp->lp++;
+	}
+	if (ntrp->lp > ntrp->bp)
+		ntrp->bp->wslen = 0;
+	return ntrp;
+}
+
+/*
+ * Debugging
+ */
+void
+peektokens(Tokenrow *trp, char *str)
+{
+	Token *tp;
+
+	tp = trp->tp;
+	flushout();
+	if (str)
+		fprintf(stderr, "%s ", str);
+	if (tp<trp->bp || tp>trp->lp)
+		fprintf(stderr, "(tp offset %d) ", tp-trp->bp);
+	for (tp=trp->bp; tp<trp->lp && tp<trp->bp+32; tp++) {
+		if (tp->type!=NL) {
+			int c = tp->t[tp->len];
+			tp->t[tp->len] = 0;
+			fprintf(stderr, "%s", tp->t);
+			tp->t[tp->len] = c;
+		}
+		if (tp->type==NAME) {
+			fprintf(stderr, tp==trp->tp?"{*":"{");
+			prhideset(tp->hideset);
+			fprintf(stderr, "} ");
+		} else
+			fprintf(stderr, tp==trp->tp?"{%x*} ":"{%x} ", tp->type);
+	}
+	fprintf(stderr, "\n");
+	fflush(stderr);
+}
+
+void
+puttokens(Tokenrow *trp)
+{
+	Token *tp;
+	int len;
+	uchar *p;
+
+	if (verbose)
+		peektokens(trp, "");
+	tp = trp->bp;
+	for (; tp<trp->lp; tp++) {
+		len = tp->len+tp->wslen;
+		p = tp->t-tp->wslen;
+		while (tp<trp->lp-1 && p+len == (tp+1)->t - (tp+1)->wslen) {
+			tp++;
+			len += tp->wslen+tp->len;
+		}
+		if (len>OBS/2) {		/* handle giant token */
+			if (wbp > wbuf)
+				write(1, wbuf, wbp-wbuf);
+			write(1, (char *)p, len);
+			wbp = wbuf;
+		} else {	
+			memcpy(wbp, p, len);
+			wbp += len;
+		}
+		if (wbp >= &wbuf[OBS]) {
+			write(1, wbuf, OBS);
+			if (wbp > &wbuf[OBS])
+				memcpy(wbuf, wbuf+OBS, wbp - &wbuf[OBS]);
+			wbp -= OBS;
+		}
+	}
+	trp->tp = tp;
+	if (cursource->fd==0)
+		flushout();
+}
+
+void
+flushout(void)
+{
+	if (wbp>wbuf) {
+		write(1, wbuf, wbp-wbuf);
+		wbp = wbuf;
+	}
+}
+
+/*
+ * turn a row into just a newline
+ */
+void
+setempty(Tokenrow *trp)
+{
+	trp->tp = trp->bp;
+	trp->lp = trp->bp+1;
+	*trp->bp = nltoken;
+}
+
+/*
+ * generate a number
+ */
+char *
+outnum(char *p, int n)
+{
+	if (n>=10)
+		p = outnum(p, n/10);
+	*p++ = n%10 + '0';
+	return p;
+}
+
+/*
+ * allocate and initialize a new string from s, of length l, at offset o
+ * Null terminated.
+ */
+uchar *
+newstring(uchar *s, int l, int o)
+{
+	uchar *ns = (uchar *)domalloc(l+o+1);
+
+	ns[l+o] = '\0';
+	return (uchar*)strncpy((char*)ns+o, (char*)s, l) - o;
+}