Calculate size of array of stubbed type

Sizes of stubbed types are calculated on demand in check_typedef, so the
same must also be done for arrays of stubbed types.

A stubbed type is usually a structure that has only been forward declared,
but can also happen if the structure has a virtual function that's not
inline in the class definition.

For these stubbed types, the size must be recalculated once the full
definition is available.

gdb/ChangeLog:

2020-04-30  Hannes Domani  <ssbssa@yahoo.de>

	PR gdb/18706
	* gdbtypes.c (check_typedef): Calculate size of array of
	stubbed type.

gdb/testsuite/ChangeLog:

2020-04-30  Hannes Domani  <ssbssa@yahoo.de>

	PR gdb/18706
	* gdb.cp/stub-array-size.cc: New test.
	* gdb.cp/stub-array-size.exp: New file.
	* gdb.cp/stub-array-size.h: New test.
	* gdb.cp/stub-array-size2.cc: New test.

7 files changed, 126 insertions, 0 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index d9f2b2c..3a8d244 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,11 @@
 2020-04-30  Hannes Domani  <ssbssa@yahoo.de>
 
+	PR gdb/18706
+	* gdbtypes.c (check_typedef): Calculate size of array of
+	stubbed type.
+
+2020-04-30  Hannes Domani  <ssbssa@yahoo.de>
+
 	PR gdb/15559
 	* i386-tdep.c (i386_push_dummy_call): Call
 	i386_thiscall_push_dummy_call.
diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index 7398435..6648dc4d 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -2873,6 +2873,20 @@ check_typedef (struct type *type)
 	  TYPE_LENGTH (type) = TYPE_LENGTH (target_type);
 	  TYPE_TARGET_STUB (type) = 0;
 	}
+      else if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
+	{
+	  struct type *range_type = check_typedef (TYPE_INDEX_TYPE (type));
+	  if (has_static_range (TYPE_RANGE_DATA (range_type)))
+	    {
+	      ULONGEST len = 0;
+	      LONGEST low_bound = TYPE_LOW_BOUND (range_type);
+	      LONGEST high_bound = TYPE_HIGH_BOUND (range_type);
+	      if (high_bound >= low_bound)
+		len = (high_bound - low_bound + 1) * TYPE_LENGTH (target_type);
+	      TYPE_LENGTH (type) = len;
+	      TYPE_TARGET_STUB (type) = 0;
+	    }
+	}
     }
 
   type = make_qualified_type (type, instance_flags, NULL);
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 6b25cd8..e2bf45b 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,13 @@
 2020-04-30  Hannes Domani  <ssbssa@yahoo.de>
 
+	PR gdb/18706
+	* gdb.cp/stub-array-size.cc: New test.
+	* gdb.cp/stub-array-size.exp: New file.
+	* gdb.cp/stub-array-size.h: New test.
+	* gdb.cp/stub-array-size2.cc: New test.
+
+2020-04-30  Hannes Domani  <ssbssa@yahoo.de>
+
 	* gdb.python/py-format-string.exp: Adjust pretty_arrays expected
 	output to the new format.
 
diff --git a/gdb/testsuite/gdb.cp/stub-array-size.cc b/gdb/testsuite/gdb.cp/stub-array-size.cc
new file mode 100644
index 0000000..281d70d
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/stub-array-size.cc
@@ -0,0 +1,25 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2020 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "stub-array-size.h"
+
+A a[10];
+
+int main()
+{
+  return 0;
+};
diff --git a/gdb/testsuite/gdb.cp/stub-array-size.exp b/gdb/testsuite/gdb.cp/stub-array-size.exp
new file mode 100644
index 0000000..c43d35b
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/stub-array-size.exp
@@ -0,0 +1,30 @@
+# Copyright 2020 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This file is part of the gdb testsuite.
+
+# Test size of arrays of stubbed types (structures where the full definition
+# is not immediately available).
+
+if {[skip_cplus_tests]} { continue }
+
+standard_testfile .cc stub-array-size2.cc
+
+if {[prepare_for_testing "failed to prepare" $testfile "$srcfile $srcfile2" \
+	{c++ debug}]} {
+    return -1
+}
+
+gdb_test "print sizeof(a)/sizeof(a\[0\])" "10"
diff --git a/gdb/testsuite/gdb.cp/stub-array-size.h b/gdb/testsuite/gdb.cp/stub-array-size.h
new file mode 100644
index 0000000..5006633
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/stub-array-size.h
@@ -0,0 +1,21 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2020 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+struct A
+{
+  virtual ~A();
+};
diff --git a/gdb/testsuite/gdb.cp/stub-array-size2.cc b/gdb/testsuite/gdb.cp/stub-array-size2.cc
new file mode 100644
index 0000000..8eda4bd
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/stub-array-size2.cc
@@ -0,0 +1,22 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2020 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "stub-array-size.h"
+
+A::~A()
+{
+}