[GDBserver] unit test to i386_tdesc

This patch adds a unit test in GDBserver to test dynamically created
target descriptions equal these pre-generated ones.

gdb/gdbserver:

2017-09-05  Yao Qi  <yao.qi@linaro.org>

	* linux-x86-tdesc.c: Include selftest.h.
	(i386_tdesc_test): New function.
	(initialize_low_tdesc): Call selftests::register_test.
	* tdesc.h: Include regdef.h.
	(target_desc): Override operator == and !=.

gdb:

2017-09-05  Yao Qi  <yao.qi@linaro.org>

	* regformats/regdef.h (struct reg): Override operator == and !=.

1 files changed, 41 insertions, 1 deletions

diff --git a/gdb/gdbserver/tdesc.h b/gdb/gdbserver/tdesc.h
index 50d0364..49c82c6 100644
--- a/gdb/gdbserver/tdesc.h
+++ b/gdb/gdbserver/tdesc.h
@@ -21,7 +21,7 @@
 
 #include "arch/tdesc.h"
 
-struct reg;
+#include "regdef.h"
 
 typedef struct reg *tdesc_reg_p;
 DEF_VEC_P(tdesc_reg_p);
@@ -66,6 +66,46 @@ public:
       xfree (reg);
     VEC_free (tdesc_reg_p, reg_defs);
   }
+
+  bool operator== (const target_desc &other) const
+  {
+    if (VEC_length (tdesc_reg_p, reg_defs)
+	!= VEC_length (tdesc_reg_p, other.reg_defs))
+      return false;
+
+    struct reg *reg;
+
+    for (int ix = 0;
+	 VEC_iterate (tdesc_reg_p, reg_defs, ix, reg);
+	 ix++)
+      {
+	struct reg *reg2
+	  = VEC_index (tdesc_reg_p, other.reg_defs, ix);
+
+	if (reg != reg2 && *reg != *reg2)
+	  return false;
+      }
+
+    /* Compare expedite_regs.  */
+    int i = 0;
+    for (; expedite_regs[i] != NULL; i++)
+      {
+	if (strcmp (expedite_regs[i], other.expedite_regs[i]) != 0)
+	  return false;
+      }
+    if (other.expedite_regs[i] != NULL)
+      return false;
+
+    if (strcmp (xmltarget, other.xmltarget) != 0)
+      return false;
+
+    return true;
+  }
+
+  bool operator!= (const target_desc &other) const
+  {
+    return !(*this == other);
+  }
 #endif
 };