add verbose stack display option, -Dvs

Message-id: <20020805005533.B26111@fdgroup.com>

p4raw-id: //depot/perl@17718

1 files changed, 201 insertions, 24 deletions

diff --git a/deb.c b/deb.c
index 6a5a21c202..37b42e1687 100644
--- a/deb.c
+++ b/deb.c
@@ -78,49 +78,226 @@ Perl_debstackptrs(pTHX)
     return 0;
 }
 
-I32
-Perl_debstack(pTHX)
-{
-#ifndef SKIP_DEBUGGING
-    I32 top = PL_stack_sp - PL_stack_base;
-    register I32 i = top - 30;
-    I32 *markscan = PL_markstack + PL_curstackinfo->si_markoff;
 
-    if (CopSTASH_eq(PL_curcop, PL_debstash) && !DEBUG_J_TEST_)
-	return 0;
+/* dump the contents of a particular stack
+ * Display stack_base[stack_min+1 .. stack_max],
+ * and display the marks whose offsets are contained in addresses
+ * PL_markstack[mark_min+1 .. mark_max] and whose values are in the range
+ * of the stack values being displayed
+ *
+ * Only displays top 30 max
+ */
 
-    if (i < 0)
-	i = 0;
+STATIC void
+S_deb_stack_n(pTHX_ SV** stack_base, I32 stack_min, I32 stack_max,
+	I32 mark_min, I32 mark_max)
+{
+#ifdef DEBUGGING
+    register I32 i = stack_max - 30;
+    I32 *markscan = PL_markstack + mark_min;
+    if (i < stack_min)
+	i = stack_min;
     
-    while (++markscan <= PL_markstack_ptr)
+    while (++markscan <= PL_markstack + mark_max)
 	if (*markscan >= i)
 	    break;
 
-#ifdef USE_5005THREADS
-    PerlIO_printf(Perl_debug_log,
-		  i ? "0x%"UVxf"    =>  ...  " : "0x%lx    =>  ",
-		  PTR2UV(thr));
-#else
-    PerlIO_printf(Perl_debug_log, i ? "    =>  ...  " : "    =>  ");
-#endif /* USE_5005THREADS */
-    if (PL_stack_base[0] != &PL_sv_undef || PL_stack_sp < PL_stack_base)
+    if (i > stack_min)
+	PerlIO_printf(Perl_debug_log, "... ");
+
+    if (stack_base[0] != &PL_sv_undef || stack_max < 0)
 	PerlIO_printf(Perl_debug_log, " [STACK UNDERFLOW!!!]\n");
     do {
 	++i;
-	if (markscan <= PL_markstack_ptr && *markscan < i) {
+	if (markscan <= PL_markstack + mark_max && *markscan < i) {
 	    do {
 		++markscan;
 		PerlIO_putc(Perl_debug_log, '*');
 	    }
-	    while (markscan <= PL_markstack_ptr && *markscan < i);
+	    while (markscan <= PL_markstack + mark_max && *markscan < i);
 	    PerlIO_printf(Perl_debug_log, "  ");
 	}
-	if (i > top)
+	if (i > stack_max)
 	    break;
-	PerlIO_printf(Perl_debug_log, "%-4s  ", SvPEEK(PL_stack_base[i]));
+	PerlIO_printf(Perl_debug_log, "%-4s  ", SvPEEK(stack_base[i]));
     }
     while (1);
     PerlIO_printf(Perl_debug_log, "\n");
+#endif /* DEBUGGING */
+}
+
+
+/* dump the current stack */
+
+I32
+Perl_debstack(pTHX)
+{
+#ifndef SKIP_DEBUGGING
+    if (CopSTASH_eq(PL_curcop, PL_debstash) && !DEBUG_J_TEST_)
+	return 0;
+
+    PerlIO_printf(Perl_debug_log, "    =>  ");
+    deb_stack_n(PL_stack_base,
+		0,
+		PL_stack_sp - PL_stack_base,
+		PL_curstackinfo->si_markoff,
+		PL_markstack_ptr - PL_markstack);
+
+
 #endif /* SKIP_DEBUGGING */
     return 0;
 }
+
+
+#ifdef DEBUGGING
+static char * si_names[] = {
+    "UNKNOWN",
+    "UNDEF",
+    "MAIN",
+    "MAGIC",
+    "SORT",
+    "SIGNAL",
+    "OVERLOAD",
+    "DESTROY",
+    "WARNHOOK",
+    "DIEHOOK",
+    "REQUIRE"
+};
+#endif
+
+/* display all stacks */
+
+
+void
+Perl_deb_stack_all(pTHX)
+{
+#ifdef DEBUGGING
+    I32		 ix, si_ix;
+    PERL_SI	 *si;
+    PERL_CONTEXT *cx;
+
+    /* rewind to start of chain */
+    si = PL_curstackinfo;
+    while (si->si_prev)
+	si = si->si_prev;
+
+    si_ix=0;
+    for (;;)
+    {
+	char *si_name;
+	int si_name_ix = si->si_type+1; /* -1 is a valid index */
+	if (si_name_ix>= sizeof(si_names))
+	    si_name = "????";
+	else
+	    si_name = si_names[si_name_ix];
+	PerlIO_printf(Perl_debug_log, "STACK %"IVdf": %s\n",
+						si_ix, si_name);
+
+	for (ix=0; ix<=si->si_cxix; ix++) {
+
+	    cx = &(si->si_cxstack[ix]);
+	    PerlIO_printf(Perl_debug_log,
+		    "  CX %"IVdf": %-6s => ",
+		    ix, PL_block_type[CxTYPE(cx)]
+	    );
+	    /* substitution contexts don't save stack pointers etc) */
+	    if (CxTYPE(cx) == CXt_SUBST)
+		PerlIO_printf(Perl_debug_log, "\n");
+	    else {
+
+		/* Find the the current context's stack range by searching
+		 * forward for any higher contexts using this stack; failing
+		 * that, it will be equal to the size of the stack for old
+		 * stacks, or PL_stack_sp for the current stack
+		 */
+
+		I32 i, stack_min, stack_max, mark_min, mark_max;
+		I32 ret_min, ret_max;
+		PERL_CONTEXT *cx_n;
+		PERL_SI      *si_n;
+
+		cx_n = Null(PERL_CONTEXT*);
+
+		/* there's a separate stack per SI, so only search
+		 * this one */
+
+		for (i=ix+1; i<=si->si_cxix; i++) {
+		    if (CxTYPE(cx) == CXt_SUBST)
+			continue;
+		    cx_n = &(si->si_cxstack[i]);
+		    break;
+		}
+
+		stack_min = cx->blk_oldsp;
+
+		if (cx_n) {
+		    stack_max = cx_n->blk_oldsp;
+		}
+		else if (si == PL_curstackinfo) {
+		    stack_max = PL_stack_sp - AvARRAY(si->si_stack);
+		}
+		else {
+		    stack_max = AvFILLp(si->si_stack);
+		}
+
+		/* for the other stack types, there's only one stack
+		 * shared between all SIs */
+
+		si_n = si;
+		i = ix;
+		cx_n = Null(PERL_CONTEXT*);
+		for (;;) {
+		    i++;
+		    if (i > si_n->si_cxix) {
+			if (si_n == PL_curstackinfo)
+			    break;
+			else {
+			    si_n = si_n->si_next;
+			    i = 0;
+			}
+		    }
+		    if (CxTYPE(&(si_n->si_cxstack[i])) == CXt_SUBST)
+			continue;
+		    cx_n = &(si_n->si_cxstack[i]);
+		    break;
+		}
+
+		mark_min  = cx->blk_oldmarksp;
+		ret_min   = cx->blk_oldretsp;
+		if (cx_n) {
+		    mark_max  = cx_n->blk_oldmarksp;
+		    ret_max   = cx_n->blk_oldretsp;
+		}
+		else {
+		    mark_max = PL_markstack_ptr - PL_markstack;
+		    ret_max  = PL_retstack_ix;
+		}
+
+		deb_stack_n(AvARRAY(si->si_stack),
+			stack_min, stack_max, mark_min, mark_max);
+
+		if (ret_max > ret_min) {
+		    PerlIO_printf(Perl_debug_log, "  retop=%s\n",
+			    PL_retstack[ret_min]
+				? OP_NAME(PL_retstack[ret_min])
+				: "(null)"
+		    );
+		}
+
+	    }
+	} /* next context */
+
+
+	if (si == PL_curstackinfo)
+	    break;
+	si = si->si_next;
+	si_ix++;
+	if (!si)
+	    break; /* shouldn't happen, but just in case.. */
+    } /* next stackinfo */
+
+    PerlIO_printf(Perl_debug_log, "\n");
+#endif /* DEBUGGING */
+}
+
+