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gdb/SOURCES/gdb-rhbz2155439-assert-fail...

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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Bruno Larsen <blarsen@redhat.com>
Date: Wed, 22 Mar 2023 15:48:00 +0100
Subject: gdb-rhbz2155439-assert-failure-copy_type.patch
;; Backport "Fix assertion failure in copy_type"
;; (Tom Tromey, RHBZ2155439)
PR exp/20630 points out a simple way to cause an assertion failure in
copy_type -- but this was found in the wild a few times as well.
copy_type only works for objfile-owned types, but there isn't a deep
reason for this. This patch fixes the bug by updating copy_type to
work for any sort of type.
Better would perhaps be to finally implement type GC, but I still
haven't attempted this.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=20630
diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -5504,27 +5504,24 @@ copy_type_recursive (struct objfile *objfile,
}
/* Make a copy of the given TYPE, except that the pointer & reference
- types are not preserved.
-
- This function assumes that the given type has an associated objfile.
- This objfile is used to allocate the new type. */
+ types are not preserved. */
struct type *
copy_type (const struct type *type)
{
- struct type *new_type;
-
- gdb_assert (TYPE_OBJFILE_OWNED (type));
-
- new_type = alloc_type_copy (type);
+ struct type *new_type = alloc_type_copy (type);
TYPE_INSTANCE_FLAGS (new_type) = TYPE_INSTANCE_FLAGS (type);
TYPE_LENGTH (new_type) = TYPE_LENGTH (type);
memcpy (TYPE_MAIN_TYPE (new_type), TYPE_MAIN_TYPE (type),
sizeof (struct main_type));
if (type->main_type->dyn_prop_list != NULL)
- new_type->main_type->dyn_prop_list
- = copy_dynamic_prop_list (&TYPE_OBJFILE (type) -> objfile_obstack,
- type->main_type->dyn_prop_list);
+ {
+ struct obstack *storage = (TYPE_OBJFILE_OWNED (type)
+ ? &TYPE_OBJFILE (type)->objfile_obstack
+ : gdbarch_obstack (TYPE_OWNER (type).gdbarch));
+ new_type->main_type->dyn_prop_list
+ = copy_dynamic_prop_list (storage, type->main_type->dyn_prop_list);
+ }
return new_type;
}
diff --git a/gdb/testsuite/gdb.base/printcmds.exp b/gdb/testsuite/gdb.base/printcmds.exp
--- a/gdb/testsuite/gdb.base/printcmds.exp
+++ b/gdb/testsuite/gdb.base/printcmds.exp
@@ -733,6 +733,9 @@ proc test_print_array_constants {} {
gdb_test_escape_braces "print {{0,1,2},{3,4,5}}" " = {{0, 1, 2}, {3, 4, 5}}"
gdb_test "print {4,5,6}\[2\]" " = 6"
gdb_test "print *&{4,5,6}\[1\]" "Attempt to take address of value not located in memory."
+
+ # This used to cause a crash.
+ gdb_test "print {unsigned char[]}{65}" " = 65 'A'"
}
proc test_print_enums {} {