libxl/gentest.py: test deep copy functions

The test is done as followed:
1. initialise libxl_FOO struct A
2. deep-copy A to B
3. generate JSON string for A and B
4. compare two JSON strings

If two strings are identical then we're good.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/libxl/gentest.py

@@ -273,6 +273,43 @@ int main(int argc, char **argv)
             f.write("    %s(&%s_val_new);\n" % (ty.dispose_fn, ty.typename))
         f.write("\n")
 
+    f.write("    printf(\"Testing TYPE_copy()\\n\");\n")
+    f.write("    printf(\"----------------------\\n\");\n")
+    f.write("    printf(\"\\n\");\n")
+    for ty in [t for t in types if t.copy_fn is not None]:
+        f.write("    printf(\"Testing %s_copy, \");\n" % ty.typename)
+        arg = ty.typename + "_val"
+        f.write("    %s_init(%s);\n" % (ty.typename, \
+            ty.pass_arg(arg, isref=False, passby=idl.PASS_BY_REFERENCE)))
+        f.write("    %s_rand_init(%s);\n" % (ty.typename, \
+            ty.pass_arg(arg, isref=False, passby=idl.PASS_BY_REFERENCE)))
+        f.write("    %s_init(%s_new);\n" % (ty.typename, \
+            ty.pass_arg(arg, isref=False, passby=idl.PASS_BY_REFERENCE)))
+        f.write("    %s_copy(ctx, %s_new, %s);\n" % (ty.typename, \
+            ty.pass_arg(arg, isref=False, passby=idl.PASS_BY_REFERENCE), \
+            ty.pass_arg(arg, isref=False, passby=idl.PASS_BY_REFERENCE)))
+        f.write("    s = %s_to_json(ctx, %s);\n" % \
+                (ty.typename, ty.pass_arg(arg, isref=False)))
+        f.write("    if (s == NULL) abort();\n")
+        f.write("    new_s = %s_to_json(ctx, %s_new);\n" % \
+                (ty.typename, ty.pass_arg(arg, isref=False)))
+        f.write("    if (new_s == NULL) abort();\n")
+        f.write("    if (strcmp(s, new_s)) {\n")
+        f.write("        printf(\"Huh? Deep copy for %s failed. Regenerated string different from original string.\\n\");\n" \
+                % ty.typename)
+        f.write("        printf(\"Original string: %s\\n\", s);\n")
+        f.write("        printf(\"Regenerated string: %s\\n\", new_s);\n")
+        f.write("        abort();\n")
+        f.write("    }\n")
+        f.write("    free(s);\n")
+        f.write("    free(new_s);\n")
+        if ty.dispose_fn is not None:
+            f.write("    %s(&%s_val);\n" % (ty.dispose_fn, ty.typename))
+            f.write("    %s(&%s_val_new);\n" % (ty.dispose_fn, ty.typename))
+        f.write("    printf(\"done\\n\");\n")
+        f.write("\n")
+
+    f.write("    printf(\"\\n\");\n")
     f.write("    printf(\"Testing Enumerations\\n\");\n")
     f.write("    printf(\"--------------------\\n\");\n")
     f.write("    printf(\"\\n\");\n")