QAPI patches

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Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2015-06-18' into staging

QAPI patches

# gpg: Signature made Thu Jun 18 13:20:00 2015 BST using RSA key ID EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"

* remotes/armbru/tags/pull-qapi-2015-06-18:
  qapi-types: Bury code dead since commit 6b5abc7
  qapi-types: Split generate_fwd_builtin() off generate_fwd_struct()
  qapi-types: Drop unused members parameters
  qapi-types: Don't filter out expressions with 'gen'
  qapi: Catch and reject flat union branch of array type
  tests/qapi-schema: New flat union array branch test case
  qapi: Better separate the different kinds of helpers
  qapi: Move exprs checking from parse_schema() to check_exprs()
  qapi: Fix to reject stray 't', 'f' and 'n'
  qapi: Simplify inclusion cycle detection
  qapi: Fix file name in error messages for included files
  qapi: Improve a couple of confusing variable names
  qapi: Eliminate superfluous QAPISchema attribute input_dir
  qapi: Drop bogus command from docs
  MAINTAINERS: Fix up QAPI and QAPI schema file patterns

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

MAINTAINERS

@@ -952,7 +952,10 @@ M: Markus Armbruster <armbru@redhat.com>
 M: Michael Roth <mdroth@linux.vnet.ibm.com>
 S: Supported
 F: qapi/
+X: qapi/*.json
 F: tests/qapi-schema/
+F: scripts/qapi*
+F: docs/qapi*
 T: git git://repo.or.cz/qemu/armbru.git qapi-next
 
 QAPI Schema
@@ -960,6 +963,7 @@ M: Eric Blake <eblake@redhat.com>
 M: Markus Armbruster <armbru@redhat.com>
 S: Supported
 F: qapi-schema.json
+F: qapi/*.json
 T: git git://repo.or.cz/qemu/armbru.git qapi-next
 
 QObject

docs/qapi-code-gen.txt

@@ -680,8 +680,6 @@ Example:
     out:
         error_propagate(errp, err);
     }
-    $ python scripts/qapi-commands.py --output-dir="qapi-generated" \
-    --prefix="example-" example-schema.json
     $ cat qapi-generated/example-qapi-visit.h
 [Uninteresting stuff omitted...]
 

scripts/qapi-types.py

@@ -12,9 +12,8 @@
 from ordereddict import OrderedDict
 from qapi import *
 
-def generate_fwd_struct(name, members, builtin_type=False):
+def generate_fwd_builtin(name):
-    if builtin_type:
+    return mcgen('''
-        return mcgen('''
 
 typedef struct %(name)sList
 {
@@ -25,9 +24,10 @@ typedef struct %(name)sList
     struct %(name)sList *next;
 } %(name)sList;
 ''',
-                     type=c_type(name),
+                 type=c_type(name),
-                     name=name)
+                 name=name)
 
+def generate_fwd_struct(name):
     return mcgen('''
 
 typedef struct %(name)s %(name)s;
@@ -43,7 +43,7 @@ typedef struct %(name)sList
 ''',
                  name=c_name(name))
 
-def generate_fwd_enum_struct(name, members):
+def generate_fwd_enum_struct(name):
     return mcgen('''
 typedef struct %(name)sList
 {
@@ -75,7 +75,6 @@ def generate_struct_fields(members):
 def generate_struct(expr):
 
     structname = expr.get('struct', "")
-    fieldname = expr.get('field', "")
     members = expr['data']
     base = expr.get('base')
 
@@ -98,12 +97,9 @@ struct %(name)s
     char qapi_dummy_field_for_empty_struct;
 ''')
 
-    if len(fieldname):
-        fieldname = " " + fieldname
     ret += mcgen('''
-}%(field)s;
+};
-''',
+''')
-            field=fieldname)
 
     return ret
 
@@ -329,30 +325,29 @@ fdecl.write(mcgen('''
 '''))
 
 exprs = parse_schema(input_file)
-exprs = filter(lambda expr: not expr.has_key('gen'), exprs)
 
 fdecl.write(guardstart("QAPI_TYPES_BUILTIN_STRUCT_DECL"))
 for typename in builtin_types.keys():
-    fdecl.write(generate_fwd_struct(typename, None, builtin_type=True))
+    fdecl.write(generate_fwd_builtin(typename))
 fdecl.write(guardend("QAPI_TYPES_BUILTIN_STRUCT_DECL"))
 
 for expr in exprs:
     ret = "\n"
     if expr.has_key('struct'):
-        ret += generate_fwd_struct(expr['struct'], expr['data'])
+        ret += generate_fwd_struct(expr['struct'])
     elif expr.has_key('enum'):
         ret += generate_enum(expr['enum'], expr['data']) + "\n"
-        ret += generate_fwd_enum_struct(expr['enum'], expr['data'])
+        ret += generate_fwd_enum_struct(expr['enum'])
         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_fwd_struct(expr['union']) + "\n"
         enum_define = discriminator_find_enum_define(expr)
         if not enum_define:
             ret += generate_enum('%sKind' % expr['union'], expr['data'].keys())
             fdef.write(generate_enum_lookup('%sKind' % expr['union'],
                                             expr['data'].keys()))
     elif expr.has_key('alternate'):
-        ret += generate_fwd_struct(expr['alternate'], expr['data']) + "\n"
+        ret += generate_fwd_struct(expr['alternate']) + "\n"
         ret += generate_enum('%sKind' % expr['alternate'], expr['data'].keys())
         fdef.write(generate_enum_lookup('%sKind' % expr['alternate'],
                                         expr['data'].keys()))

scripts/qapi.py

@@ -65,6 +65,10 @@ union_types = []
 events = []
 all_names = {}
 
+#
+# Parsing the schema into expressions
+#
+
 def error_path(parent):
     res = ""
     while parent:
@@ -75,7 +79,7 @@ def error_path(parent):
 
 class QAPISchemaError(Exception):
     def __init__(self, schema, msg):
-        self.input_file = schema.input_file
+        self.fname = schema.fname
         self.msg = msg
         self.col = 1
         self.line = schema.line
@@ -84,11 +88,11 @@ class QAPISchemaError(Exception):
                 self.col = (self.col + 7) % 8 + 1
             else:
                 self.col += 1
-        self.info = schema.parent_info
+        self.info = schema.incl_info
 
     def __str__(self):
         return error_path(self.info) + \
-            "%s:%d:%d: %s" % (self.input_file, self.line, self.col, self.msg)
+            "%s:%d:%d: %s" % (self.fname, self.line, self.col, self.msg)
 
 class QAPIExprError(Exception):
     def __init__(self, expr_info, msg):
@@ -101,19 +105,12 @@ class QAPIExprError(Exception):
 
 class QAPISchema:
 
-    def __init__(self, fp, input_relname=None, include_hist=[],
+    def __init__(self, fp, previously_included = [], incl_info = None):
-                 previously_included=[], parent_info=None):
+        abs_fname = os.path.abspath(fp.name)
-        """ include_hist is a stack used to detect inclusion cycles
+        fname = fp.name
-            previously_included is a global state used to avoid multiple
+        self.fname = fname
-                                inclusions of the same file"""
+        previously_included.append(abs_fname)
-        input_fname = os.path.abspath(fp.name)
+        self.incl_info = incl_info
-        if input_relname is None:
-            input_relname = fp.name
-        self.input_dir = os.path.dirname(input_fname)
-        self.input_file = input_relname
-        self.include_hist = include_hist + [(input_relname, input_fname)]
-        previously_included.append(input_fname)
-        self.parent_info = parent_info
         self.src = fp.read()
         if self.src == '' or self.src[-1] != '\n':
             self.src += '\n'
@@ -124,7 +121,8 @@ class QAPISchema:
         self.accept()
 
         while self.tok != None:
-            expr_info = {'file': input_relname, 'line': self.line, 'parent': self.parent_info}
+            expr_info = {'file': fname, 'line': self.line,
+                         'parent': self.incl_info}
             expr = self.get_expr(False)
             if isinstance(expr, dict) and "include" in expr:
                 if len(expr) != 1:
@@ -134,21 +132,25 @@ class QAPISchema:
                     raise QAPIExprError(expr_info,
                                         'Expected a file name (string), got: %s'
                                         % include)
-                include_path = os.path.join(self.input_dir, include)
+                incl_abs_fname = os.path.join(os.path.dirname(abs_fname),
-                for elem in self.include_hist:
+                                              include)
-                    if include_path == elem[1]:
+                # catch inclusion cycle
+                inf = expr_info
+                while inf:
+                    if incl_abs_fname == os.path.abspath(inf['file']):
                         raise QAPIExprError(expr_info, "Inclusion loop for %s"
                                             % include)
+                    inf = inf['parent']
                 # skip multiple include of the same file
-                if include_path in previously_included:
+                if incl_abs_fname in previously_included:
                     continue
                 try:
-                    fobj = open(include_path, 'r')
+                    fobj = open(incl_abs_fname, 'r')
                 except IOError, e:
                     raise QAPIExprError(expr_info,
                                         '%s: %s' % (e.strerror, include))
-                exprs_include = QAPISchema(fobj, include, self.include_hist,
+                exprs_include = QAPISchema(fobj, previously_included,
-                                           previously_included, expr_info)
+                                           expr_info)
                 self.exprs.extend(exprs_include.exprs)
             else:
                 expr_elem = {'expr': expr,
@@ -219,20 +221,18 @@ class QAPISchema:
                         return
                     else:
                         string += ch
-            elif self.tok in "tfn":
+            elif self.src.startswith("true", self.pos):
-                val = self.src[self.cursor - 1:]
+                self.val = True
-                if val.startswith("true"):
+                self.cursor += 3
-                    self.val = True
+                return
-                    self.cursor += 3
+            elif self.src.startswith("false", self.pos):
-                    return
+                self.val = False
-                elif val.startswith("false"):
+                self.cursor += 4
-                    self.val = False
+                return
-                    self.cursor += 4
+            elif self.src.startswith("null", self.pos):
-                    return
+                self.val = None
-                elif val.startswith("null"):
+                self.cursor += 3
-                    self.val = None
+                return
-                    self.cursor += 3
-                    return
             elif self.tok == '\n':
                 if self.cursor == len(self.src):
                     self.tok = None
@@ -300,6 +300,10 @@ class QAPISchema:
             raise QAPISchemaError(self, 'Expected "{", "[" or string')
         return expr
 
+#
+# Semantic analysis of schema expressions
+#
+
 def find_base_fields(base):
     base_struct_define = find_struct(base)
     if not base_struct_define:
@@ -360,6 +364,60 @@ def check_name(expr_info, source, name, allow_optional = False,
         raise QAPIExprError(expr_info,
                             "%s uses invalid name '%s'" % (source, name))
 
+def add_name(name, info, meta, implicit = False):
+    global all_names
+    check_name(info, "'%s'" % meta, name)
+    if name in all_names:
+        raise QAPIExprError(info,
+                            "%s '%s' is already defined"
+                            % (all_names[name], name))
+    if not implicit and name[-4:] == 'Kind':
+        raise QAPIExprError(info,
+                            "%s '%s' should not end in 'Kind'"
+                            % (meta, name))
+    all_names[name] = meta
+
+def add_struct(definition, info):
+    global struct_types
+    name = definition['struct']
+    add_name(name, info, 'struct')
+    struct_types.append(definition)
+
+def find_struct(name):
+    global struct_types
+    for struct in struct_types:
+        if struct['struct'] == name:
+            return struct
+    return None
+
+def add_union(definition, info):
+    global union_types
+    name = definition['union']
+    add_name(name, info, 'union')
+    union_types.append(definition)
+
+def find_union(name):
+    global union_types
+    for union in union_types:
+        if union['union'] == name:
+            return union
+    return None
+
+def add_enum(name, info, enum_values = None, implicit = False):
+    global enum_types
+    add_name(name, info, 'enum', implicit)
+    enum_types.append({"enum_name": name, "enum_values": enum_values})
+
+def find_enum(name):
+    global enum_types
+    for enum in enum_types:
+        if enum['enum_name'] == name:
+            return enum
+    return None
+
+def is_enum(name):
+    return find_enum(name) != None
+
 def check_type(expr_info, source, value, allow_array = False,
                allow_dict = False, allow_optional = False,
                allow_star = False, allow_metas = []):
@@ -522,7 +580,7 @@ def check_union(expr, expr_info):
         # Each value must name a known type; furthermore, in flat unions,
         # branches must be a struct with no overlapping member names
         check_type(expr_info, "Member '%s' of union '%s'" % (key, name),
-                   value, allow_array=True, allow_metas=allow_metas)
+                   value, allow_array=not base, allow_metas=allow_metas)
         if base:
             branch_struct = find_struct(value)
             assert branch_struct
@@ -607,26 +665,6 @@ def check_struct(expr, expr_info):
     if expr.get('base'):
         check_member_clash(expr_info, expr['base'], expr['data'])
 
-def check_exprs(schema):
-    for expr_elem in schema.exprs:
-        expr = expr_elem['expr']
-        info = expr_elem['info']
-
-        if expr.has_key('enum'):
-            check_enum(expr, info)
-        elif expr.has_key('union'):
-            check_union(expr, info)
-        elif expr.has_key('alternate'):
-            check_alternate(expr, info)
-        elif expr.has_key('struct'):
-            check_struct(expr, info)
-        elif expr.has_key('command'):
-            check_command(expr, info)
-        elif expr.has_key('event'):
-            check_event(expr, info)
-        else:
-            assert False, 'unexpected meta type'
-
 def check_keys(expr_elem, meta, required, optional=[]):
     expr = expr_elem['expr']
     info = expr_elem['info']
@@ -650,69 +688,83 @@ def check_keys(expr_elem, meta, required, optional=[]):
                                 "Key '%s' is missing from %s '%s'"
                                 % (key, meta, name))
 
-
+def check_exprs(exprs):
-def parse_schema(input_file):
     global all_names
-    exprs = []
 
-    # First pass: read entire file into memory
+    # Learn the types and check for valid expression keys
+    for builtin in builtin_types.keys():
+        all_names[builtin] = 'built-in'
+    for expr_elem in exprs:
+        expr = expr_elem['expr']
+        info = expr_elem['info']
+        if expr.has_key('enum'):
+            check_keys(expr_elem, 'enum', ['data'])
+            add_enum(expr['enum'], info, expr['data'])
+        elif expr.has_key('union'):
+            check_keys(expr_elem, 'union', ['data'],
+                       ['base', 'discriminator'])
+            add_union(expr, info)
+        elif expr.has_key('alternate'):
+            check_keys(expr_elem, 'alternate', ['data'])
+            add_name(expr['alternate'], info, 'alternate')
+        elif expr.has_key('struct'):
+            check_keys(expr_elem, 'struct', ['data'], ['base'])
+            add_struct(expr, info)
+        elif expr.has_key('command'):
+            check_keys(expr_elem, 'command', [],
+                       ['data', 'returns', 'gen', 'success-response'])
+            add_name(expr['command'], info, 'command')
+        elif expr.has_key('event'):
+            check_keys(expr_elem, 'event', [], ['data'])
+            add_name(expr['event'], info, 'event')
+        else:
+            raise QAPIExprError(expr_elem['info'],
+                                "Expression is missing metatype")
+
+    # Try again for hidden UnionKind enum
+    for expr_elem in exprs:
+        expr = expr_elem['expr']
+        if expr.has_key('union'):
+            if not discriminator_find_enum_define(expr):
+                add_enum('%sKind' % expr['union'], expr_elem['info'],
+                         implicit=True)
+        elif expr.has_key('alternate'):
+            add_enum('%sKind' % expr['alternate'], expr_elem['info'],
+                     implicit=True)
+
+    # Validate that exprs make sense
+    for expr_elem in exprs:
+        expr = expr_elem['expr']
+        info = expr_elem['info']
+
+        if expr.has_key('enum'):
+            check_enum(expr, info)
+        elif expr.has_key('union'):
+            check_union(expr, info)
+        elif expr.has_key('alternate'):
+            check_alternate(expr, info)
+        elif expr.has_key('struct'):
+            check_struct(expr, info)
+        elif expr.has_key('command'):
+            check_command(expr, info)
+        elif expr.has_key('event'):
+            check_event(expr, info)
+        else:
+            assert False, 'unexpected meta type'
+
+    return map(lambda expr_elem: expr_elem['expr'], exprs)
+
+def parse_schema(fname):
     try:
-        schema = QAPISchema(open(input_file, "r"))
+        schema = QAPISchema(open(fname, "r"))
+        return check_exprs(schema.exprs)
     except (QAPISchemaError, QAPIExprError), e:
         print >>sys.stderr, e
         exit(1)
 
-    try:
+#
-        # Next pass: learn the types and check for valid expression keys. At
+# Code generation helpers
-        # this point, top-level 'include' has already been flattened.
+#
-        for builtin in builtin_types.keys():
-            all_names[builtin] = 'built-in'
-        for expr_elem in schema.exprs:
-            expr = expr_elem['expr']
-            info = expr_elem['info']
-            if expr.has_key('enum'):
-                check_keys(expr_elem, 'enum', ['data'])
-                add_enum(expr['enum'], info, expr['data'])
-            elif expr.has_key('union'):
-                check_keys(expr_elem, 'union', ['data'],
-                           ['base', 'discriminator'])
-                add_union(expr, info)
-            elif expr.has_key('alternate'):
-                check_keys(expr_elem, 'alternate', ['data'])
-                add_name(expr['alternate'], info, 'alternate')
-            elif expr.has_key('struct'):
-                check_keys(expr_elem, 'struct', ['data'], ['base'])
-                add_struct(expr, info)
-            elif expr.has_key('command'):
-                check_keys(expr_elem, 'command', [],
-                           ['data', 'returns', 'gen', 'success-response'])
-                add_name(expr['command'], info, 'command')
-            elif expr.has_key('event'):
-                check_keys(expr_elem, 'event', [], ['data'])
-                add_name(expr['event'], info, 'event')
-            else:
-                raise QAPIExprError(expr_elem['info'],
-                                    "Expression is missing metatype")
-            exprs.append(expr)
-
-        # Try again for hidden UnionKind enum
-        for expr_elem in schema.exprs:
-            expr = expr_elem['expr']
-            if expr.has_key('union'):
-                if not discriminator_find_enum_define(expr):
-                    add_enum('%sKind' % expr['union'], expr_elem['info'],
-                             implicit=True)
-            elif expr.has_key('alternate'):
-                add_enum('%sKind' % expr['alternate'], expr_elem['info'],
-                         implicit=True)
-
-        # Final pass - validate that exprs make sense
-        check_exprs(schema)
-    except QAPIExprError, e:
-        print >>sys.stderr, e
-        exit(1)
-
-    return exprs
 
 def parse_args(typeinfo):
     if isinstance(typeinfo, str):
@@ -831,60 +883,6 @@ def type_name(value):
         return value
     return c_name(value)
 
-def add_name(name, info, meta, implicit = False):
-    global all_names
-    check_name(info, "'%s'" % meta, name)
-    if name in all_names:
-        raise QAPIExprError(info,
-                            "%s '%s' is already defined"
-                            % (all_names[name], name))
-    if not implicit and name[-4:] == 'Kind':
-        raise QAPIExprError(info,
-                            "%s '%s' should not end in 'Kind'"
-                            % (meta, name))
-    all_names[name] = meta
-
-def add_struct(definition, info):
-    global struct_types
-    name = definition['struct']
-    add_name(name, info, 'struct')
-    struct_types.append(definition)
-
-def find_struct(name):
-    global struct_types
-    for struct in struct_types:
-        if struct['struct'] == name:
-            return struct
-    return None
-
-def add_union(definition, info):
-    global union_types
-    name = definition['union']
-    add_name(name, info, 'union')
-    union_types.append(definition)
-
-def find_union(name):
-    global union_types
-    for union in union_types:
-        if union['union'] == name:
-            return union
-    return None
-
-def add_enum(name, info, enum_values = None, implicit = False):
-    global enum_types
-    add_name(name, info, 'enum', implicit)
-    enum_types.append({"enum_name": name, "enum_values": enum_values})
-
-def find_enum(name):
-    global enum_types
-    for enum in enum_types:
-        if enum['enum_name'] == name:
-            return enum
-    return None
-
-def is_enum(name):
-    return find_enum(name) != None
-
 eatspace = '\033EATSPACE.'
 pointer_suffix = ' *' + eatspace
 
@@ -981,6 +979,10 @@ def guardend(name):
 ''',
                  name=guardname(name))
 
+#
+# Common command line parsing
+#
+
 def parse_command_line(extra_options = "", extra_long_options = []):
 
     try:
@@ -1018,9 +1020,13 @@ def parse_command_line(extra_options = "", extra_long_options = []):
     if len(args) != 1:
         print >>sys.stderr, "%s: need exactly one argument" % sys.argv[0]
         sys.exit(1)
-    input_file = args[0]
+    fname = args[0]
 
-    return (input_file, output_dir, do_c, do_h, prefix, extra_opts)
+    return (fname, output_dir, do_c, do_h, prefix, extra_opts)
+
+#
+# Generate output files with boilerplate
+#
 
 def open_output(output_dir, do_c, do_h, prefix, c_file, h_file,
                 c_comment, h_comment):

tests/Makefile

@@ -237,7 +237,8 @@ check-qapi-schema-y := $(addprefix tests/qapi-schema/, \
 	flat-union-invalid-branch-key.json flat-union-reverse-define.json \
 	flat-union-string-discriminator.json union-base-no-discriminator.json \
 	flat-union-bad-discriminator.json flat-union-bad-base.json \
-	flat-union-base-star.json flat-union-int-branch.json \
+	flat-union-base-star.json \
+	flat-union-array-branch.json flat-union-int-branch.json \
 	flat-union-base-union.json flat-union-branch-clash.json \
 	alternate-nested.json alternate-unknown.json alternate-clash.json \
 	alternate-good.json alternate-base.json alternate-array.json \

tests/qapi-schema/flat-union-array-branch.err

@@ -0,0 +1 @@
+tests/qapi-schema/flat-union-array-branch.json:8: Member 'value1' of union 'TestUnion' cannot be an array

tests/qapi-schema/flat-union-array-branch.exit

@@ -0,0 +1 @@
+1

tests/qapi-schema/flat-union-array-branch.json

@@ -0,0 +1,12 @@
+# we require flat union branches to be a struct
+{ 'enum': 'TestEnum',
+  'data': [ 'value1', 'value2' ] }
+{ 'struct': 'Base',
+  'data': { 'enum1': 'TestEnum' } }
+{ 'struct': 'TestTypeB',
+  'data': { 'integer': 'int' } }
+{ 'union': 'TestUnion',
+  'base': 'Base',
+  'discriminator': 'enum1',
+  'data': { 'value1': ['TestTypeB'],
+            'value2': 'TestTypeB' } }

tests/qapi-schema/include-cycle.err

@@ -1,3 +1,3 @@
 In file included from tests/qapi-schema/include-cycle.json:1:
-In file included from include-cycle-b.json:1:
+In file included from tests/qapi-schema/include-cycle-b.json:1:
-include-cycle-c.json:1: Inclusion loop for include-cycle.json
+tests/qapi-schema/include-cycle-c.json:1: Inclusion loop for include-cycle.json

tests/qapi-schema/include-nested-err.err

@@ -1,2 +1,2 @@
 In file included from tests/qapi-schema/include-nested-err.json:1:
-missing-colon.json:1:10: Expected ":"
+tests/qapi-schema/missing-colon.json:1:10: Expected ":"