[PATCH 7/8] Disassembly unit test: memory error

[Yao Qi <qiyaoltc@gmail.com>]

This patch adds a unit test about memory error occurs on reading
memory, and check MEMORY_ERROR exception is always thrown.

gdb:

2017-01-10  Yao Qi  <yao.qi@linaro.org>

	* disasm.c (gdb_disassembler_print_one_insn_test):
	(gdb_disassembler_memory_error_test): New function.
	(_initialize_disasm): Register
	gdb_disassembler_memory_error_test.
---
 gdb/disasm.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/gdb/disasm.c b/gdb/disasm.c
index 6e403da..e908199 100644
--- a/gdb/disasm.c
+++ b/gdb/disasm.c
@@ -424,6 +424,53 @@ gdb_disassembler_print_one_insn_test (struct gdbarch *gdbarch)
   SELF_CHECK (di.print_insn (0) == len);
 }
 
+/* Test disassembly on memory error.  */
+
+static void
+gdb_disassembler_memory_error_test (struct gdbarch *gdbarch)
+{
+  class gdb_disassembler_test : public gdb_disassembler
+  {
+  public:
+    gdb_disassembler_test (struct gdbarch *gdbarch)
+      : gdb_disassembler (gdbarch, ui_file_new (),
+			  gdb_disassembler_test::read_memory)
+    {
+    }
+
+    ~gdb_disassembler_test ()
+    {
+      ui_file_delete ((struct ui_file *) m_di.stream);
+    }
+
+    static int read_memory (bfd_vma memaddr, gdb_byte *myaddr,
+			    unsigned int len,
+			    struct disassemble_info *info)
+    {
+      /* Always get an error.  */
+      return -1;
+    }
+  };
+
+  gdb_disassembler_test di (gdbarch);
+  bool see_memory_error = false;
+
+  TRY
+    {
+      di.print_insn (0);
+    }
+  CATCH (ex, RETURN_MASK_ERROR)
+    {
+      if (ex.error == MEMORY_ERROR)
+	see_memory_error = true;
+    }
+  END_CATCH
+
+  /* Expect MEMORY_ERROR.   */
+  SELF_CHECK (see_memory_error);
+
+}
+
 } // namespace selftests
 #endif /* GDB_SELF_TEST */
 
@@ -1083,5 +1130,6 @@ _initialize_disasm (void)
 {
 #if GDB_SELF_TEST
   register_self_test (selftests::gdb_disassembler_print_one_insn_test);
+  register_self_test (selftests::gdb_disassembler_memory_error_test);
 #endif
 }
-- 
1.9.1