[PATCH] Handle OP_STRING in dump_subexp_body_standard

Simon Marchi simon.marchi@ericsson.com
Thu Jun 19 14:45:00 GMT 2014


For some reason, OP_STRING is not handled in dump_subexp_body_standard.
This makes the output of "set debug expression 1" very bad when a string
is involved. Example:

(gdb) set debug expression 1
(gdb) print "hello"
... (random garbage, possibly segfault)

This commit handles OP_STRING and skips the appropriate number of exp
elements. The line corresponding to the string now looks like:

	    0  OP_STRING             Language-specific string type: 0

gdb/ChangeLog:

2014-06-19  Simon Marchi  <simon.marchi@ericsson.com>

	* expprint.c (dump_subexp_body_standard): Handle OP_STRING.
---
 gdb/expprint.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/gdb/expprint.c b/gdb/expprint.c
index 97188ed..60971a5 100644
--- a/gdb/expprint.c
+++ b/gdb/expprint.c
@@ -1011,12 +1011,29 @@ dump_subexp_body_standard (struct expression *exp,
 	elt = dump_subexp (exp, stream, elt);
       }
       break;
+    case OP_STRING:
+      {
+	LONGEST len = exp->elts[elt].longconst;
+	LONGEST type = exp->elts[elt].longconst;
+
+	fprintf_filtered (stream, "Language-specific string type: %s",
+			  plongest (type));
+
+	/* Skip length.  */
+	elt += 1;
+
+	/* Skip string content. */
+	elt += BYTES_TO_EXP_ELEM(len);
+
+	/* Skip length and ending OP_STRING. */
+	elt += 2;
+      }
+      break;
     default:
     case OP_NULL:
     case MULTI_SUBSCRIPT:
     case OP_F77_UNDETERMINED_ARGLIST:
     case OP_COMPLEX:
-    case OP_STRING:
     case OP_BOOL:
     case OP_M2_STRING:
     case OP_THIS:
-- 
2.0.0



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