debugger

src/cmd/db/pcs.c

@@ -0,0 +1,177 @@
+/*
+ *
+ *	debugger
+ *
+ */
+
+#include "defs.h"
+#include "fns.h"
+
+char	NOPCS[] = "no process";
+
+/* sub process control */
+
+void
+subpcs(int modif)
+{
+	int	check;
+	int	runmode;
+	int	keepnote;
+	int	n, r;
+	ulong line, curr;
+	BKPT *bk;
+	char *comptr;
+
+	runmode=SINGLE;
+	r = 0;
+	keepnote=0;
+	loopcnt=cntval;
+	switch (modif) {
+
+		/* delete breakpoint */
+	case 'd': 
+	case 'D':
+		if ((bk=scanbkpt(dot)) == 0)
+			error("no breakpoint set");
+		bk->flag=BKPTCLR;
+		return;
+
+		/* set breakpoint */
+	case 'b': 
+	case 'B':
+		if (bk=scanbkpt(dot))
+			bk->flag=BKPTCLR;
+		for (bk=bkpthead; bk; bk=bk->nxtbkpt)
+			if (bk->flag == BKPTCLR)
+				break;
+		if (bk==0) {
+			bk = (BKPT *)malloc(sizeof(*bk));
+			if (bk == 0)
+				error("too many breakpoints");
+			bk->nxtbkpt=bkpthead;
+			bkpthead=bk;
+		}
+		bk->loc = dot;
+		bk->initcnt = bk->count = cntval;
+		bk->flag = modif == 'b' ? BKPTSET : BKPTTMP;
+		check=MAXCOM-1;
+		comptr=bk->comm;
+		rdc();
+		reread();
+		do {
+			*comptr++ = readchar();
+		} while (check-- && lastc!=EOR);
+		*comptr=0;
+		if(bk->comm[0] != EOR && cntflg == FALSE)
+			bk->initcnt = bk->count = HUGEINT;
+		reread();
+		if (check)
+			return;
+		error("bkpt command too long");
+
+		/* exit */
+	case 'k' :
+	case 'K':
+		if (pid == 0)
+			error(NOPCS);
+		dprint("%d: killed", pid);
+		pcsactive = 1;	/* force 'kill' ctl */
+		endpcs();
+		return;
+
+		/* run program */
+	case 'r': 
+	case 'R':
+		endpcs();
+		setup();
+		runmode = CONTIN;
+		break;
+
+		/* single step */
+	case 's': 
+		if (pid == 0) {
+			setup();
+			loopcnt--;
+		}
+		runmode=SINGLE;
+		keepnote=defval(1);
+		break;
+	case 'S':
+		if (pid == 0) {
+			setup();
+			loopcnt--;
+		}
+		keepnote=defval(1);
+		if(pc2line(dbrget(cormap, mach->pc), &line) < 0)
+			error("%r");
+		n = loopcnt;
+		dprint("%s: running\n", symfil);
+		flush();
+		for (loopcnt = 1; n > 0; loopcnt = 1) {
+			r = runpcs(SINGLE, keepnote);
+			if(pc2line(dot, &curr) < 0)
+				error("%r");
+			if (line != curr) {	/* on a new line of c */
+				line = curr;
+				n--;
+			}
+		}
+		loopcnt = 0;
+		break;
+		/* continue with optional note */
+	case 'c': 
+	case 'C': 
+		if (pid==0)
+			error(NOPCS);
+		runmode=CONTIN;
+		keepnote=defval(1);
+		break;
+
+	case 'n':	/* deal with notes */
+		if (pid==0)
+			error(NOPCS);
+		n=defval(-1);
+		if(n>=0 && n<nnote){
+			nnote--;
+			memmove(note[n], note[n+1], (nnote-n)*sizeof(note[0]));
+		}
+		notes();
+		return;
+
+	case 'h':	/* halt the current process */
+		if (adrflg && adrval == 0) {
+			if (pid == 0)
+				error(NOPCS);
+			ungrab();
+		}
+		else {
+			grab();
+			dprint("stopped at%16t");
+			goto Return;
+		}
+		return;
+
+	case 'x':	/* continue executing the current process */
+		if (pid == 0)
+			error(NOPCS);
+		ungrab();
+		return;
+
+	default:
+		error("bad `:' command");
+	}
+
+	if (loopcnt>0) {
+		dprint("%s: running\n", symfil);
+		flush();
+		r = runpcs(runmode,keepnote);
+	}
+	if (r)
+		dprint("breakpoint%16t");
+	else
+		dprint("stopped at%16t");
+    Return:
+	delbp();
+	printpc();
+	notes();
+}