gdb/rust: fix crash for expression debug with strings

While working on another patch I did this:

  (gdb) set debug expression 1
  (gdb) set language rust
  (gdb) p "foo"
  Operation: OP_AGGREGATE
   Type: &str

  Fatal signal: Segmentation fault
  ... etc ...

The problem is that the second field of the rust_aggregate_operation
is created as a nullptr, this can be seen in rust-parse.c. in the
function rust_parser::parse_string().

However, in expop.h, in the function dump_for_expression, we make the
assumption that the expressions will never be nullptr.

I did consider moving the nullptr handling into a new function
rust_aggregate_operation::dump, however, as the expression debug
dumping code is not exercised as much as it might be, I would rather
that this code be hardened and able to handle a nullptr without
crashing, so I propose that we add nullptr handling into the general
dump_for_expression function.  The behaviour is now:

  (gdb) set debug expression 1
  (gdb) set language rust
  (gdb) p "foo"
  Operation: OP_AGGREGATE
   Type: &str
   nullptr
   Vector:
    String: data_ptr
    Operation: UNOP_ADDR
     Operation: OP_STRING
      String: foo
    String: length
    Operation: OP_LONG
     Type: usize
     Constant: 3
  evaluation of this expression requires the target program to be active
  (gdb)

There's a new test to check for this case.

Reviewed-By: Tom Tromey <tom@tromey.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/gdb/expop.h b/gdb/expop.h
index 854945c..a9da11c 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -314,7 +314,10 @@ static inline void
 dump_for_expression (struct ui_file *stream, int depth,
 		     const operation_up &op)
 {
-  op->dump (stream, depth);
+  if (op == nullptr)
+    gdb_printf (stream, _("%*snullptr\n"), depth, "");
+  else
+    op->dump (stream, depth);
 }
 
 extern void dump_for_expression (struct ui_file *stream, int depth,