qapi: add qapi-types.py code generator

This is the code generator for qapi types. It will generation the
following files:

  $(prefix)qapi-types.h - C types corresponding to types defined in
                          the schema you pass in
  $(prefix)qapi-types.c - Cleanup functions for the above C types

The $(prefix) is used to as a namespace to keep the generated code from
one schema/code-generation separated from others so code and be
generated from multiple schemas with clobbering previously created code.
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: NLuiz Capitulino <lcapitulino@gmail.com>

scripts/qapi-types.py

+#
+# QAPI types generator
+#
+# Copyright IBM, Corp. 2011
+#
+# Authors:
+#  Anthony Liguori <aliguori@us.ibm.com>
+#
+# This work is licensed under the terms of the GNU GPLv2.
+# See the COPYING.LIB file in the top-level directory.
+
+from ordereddict import OrderedDict
+from qapi import *
+import sys
+import os
+import getopt
+import errno
+
+def generate_fwd_struct(name, members):
+    return mcgen('''
+typedef struct %(name)s %(name)s;
+
+typedef struct %(name)sList
+{
+    %(name)s *value;
+    struct %(name)sList *next;
+} %(name)sList;
+''',
+                 name=name)
+
+def generate_struct(structname, fieldname, members):
+    ret = mcgen('''
+struct %(name)s
+{
+''',
+          name=structname)
+
+    for argname, argentry, optional, structured in parse_args(members):
+        if optional:
+            ret += mcgen('''
+    bool has_%(c_name)s;
+''',
+                         c_name=c_var(argname))
+        if structured:
+            push_indent()
+            ret += generate_struct("", argname, argentry)
+            pop_indent()
+        else:
+            ret += mcgen('''
+    %(c_type)s %(c_name)s;
+''',
+                     c_type=c_type(argentry), c_name=c_var(argname))
+
+    if len(fieldname):
+        fieldname = " " + fieldname
+    ret += mcgen('''
+}%(field)s;
+''',
+            field=fieldname)
+
+    return ret
+
+def generate_enum_lookup(name, values):
+    ret = mcgen('''
+const char *%(name)s_lookup[] = {
+''',
+                         name=name)
+    i = 0
+    for value in values:
+        ret += mcgen('''
+    "%(value)s",
+''',
+                     value=c_var(value).lower())
+
+    ret += mcgen('''
+    NULL,
+};
+
+''')
+    return ret
+
+def generate_enum(name, values):
+    lookup_decl = mcgen('''
+extern const char *%(name)s_lookup[];
+''',
+                name=name)
+
+    enum_decl = mcgen('''
+typedef enum %(name)s
+{
+''',
+                name=name)
+
+    i = 0
+    for value in values:
+        enum_decl += mcgen('''
+    %(abbrev)s_%(value)s = %(i)d,
+''',
+                     abbrev=de_camel_case(name).upper(),
+                     value=c_var(value).upper(),
+                     i=i)
+        i += 1
+
+    enum_decl += mcgen('''
+} %(name)s;
+''',
+                 name=name)
+
+    return lookup_decl + enum_decl
+
+def generate_union(name, typeinfo):
+    ret = mcgen('''
+struct %(name)s
+{
+    %(name)sKind kind;
+    union {
+''',
+                name=name)
+
+    for key in typeinfo:
+        ret += mcgen('''
+        %(c_type)s %(c_name)s;
+''',
+                     c_type=c_type(typeinfo[key]),
+                     c_name=c_var(key))
+
+    ret += mcgen('''
+    };
+};
+''')
+
+    return ret
+
+def generate_type_cleanup_decl(name):
+    ret = mcgen('''
+void qapi_free_%(type)s(%(c_type)s obj);
+''',
+                c_type=c_type(name),type=name)
+    return ret
+
+def generate_type_cleanup(name):
+    ret = mcgen('''
+void qapi_free_%(type)s(%(c_type)s obj)
+{
+    QapiDeallocVisitor *md;
+    Visitor *v;
+
+    if (!obj) {
+        return;
+    }
+
+    md = qapi_dealloc_visitor_new();
+    v = qapi_dealloc_get_visitor(md);
+    visit_type_%(type)s(v, &obj, NULL, NULL);
+    qapi_dealloc_visitor_cleanup(md);
+}
+''',
+                c_type=c_type(name),type=name)
+    return ret
+
+
+try:
+    opts, args = getopt.gnu_getopt(sys.argv[1:], "p:o:", ["prefix=", "output-dir="])
+except getopt.GetoptError, err:
+    print str(err)
+    sys.exit(1)
+
+output_dir = ""
+prefix = ""
+c_file = 'qapi-types.c'
+h_file = 'qapi-types.h'
+
+for o, a in opts:
+    if o in ("-p", "--prefix"):
+        prefix = a
+    elif o in ("-o", "--output-dir"):
+        output_dir = a + "/"
+
+c_file = output_dir + prefix + c_file
+h_file = output_dir + prefix + h_file
+
+try:
+    os.makedirs(output_dir)
+except os.error, e:
+    if e.errno != errno.EEXIST:
+        raise
+
+fdef = open(c_file, 'w')
+fdecl = open(h_file, 'w')
+
+fdef.write(mcgen('''
+/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
+
+/*
+ * deallocation functions for schema-defined QAPI types
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *  Michael Roth      <mdroth@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#include "qapi/qapi-dealloc-visitor.h"
+#include "%(prefix)sqapi-types.h"
+#include "%(prefix)sqapi-visit.h"
+
+''',             prefix=prefix))
+
+fdecl.write(mcgen('''
+/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
+
+/*
+ * schema-defined QAPI types
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef %(guard)s
+#define %(guard)s
+
+#include "qapi/qapi-types-core.h"
+''',
+                  guard=guardname(h_file)))
+
+exprs = parse_schema(sys.stdin)
+
+for expr in exprs:
+    ret = "\n"
+    if expr.has_key('type'):
+        ret += generate_fwd_struct(expr['type'], expr['data'])
+    elif expr.has_key('enum'):
+        ret += generate_enum(expr['enum'], expr['data'])
+        fdef.write(generate_enum_lookup(expr['enum'], expr['data']))
+    elif expr.has_key('union'):
+        ret += generate_fwd_struct(expr['union'], expr['data']) + "\n"
+        ret += generate_enum('%sKind' % expr['union'], expr['data'].keys())
+    else:
+        continue
+    fdecl.write(ret)
+
+for expr in exprs:
+    ret = "\n"
+    if expr.has_key('type'):
+        ret += generate_struct(expr['type'], "", expr['data']) + "\n"
+        ret += generate_type_cleanup_decl(expr['type'])
+        fdef.write(generate_type_cleanup(expr['type']) + "\n")
+    elif expr.has_key('union'):
+        ret += generate_union(expr['union'], expr['data'])
+    else:
+        continue
+    fdecl.write(ret)
+
+fdecl.write('''
+#endif
+''')
+
+fdecl.flush()
+fdecl.close()