# # QAPI helper library # # Copyright IBM, Corp. 2011 # Copyright (c) 2013-2016 Red Hat Inc. # # Authors: # Anthony Liguori # Markus Armbruster # # This work is licensed under the terms of the GNU GPL, version 2. # See the COPYING file in the top-level directory. import re from ordereddict import OrderedDict import errno import getopt import os import sys import string builtin_types = { 'str': 'QTYPE_QSTRING', 'int': 'QTYPE_QINT', 'number': 'QTYPE_QFLOAT', 'bool': 'QTYPE_QBOOL', 'int8': 'QTYPE_QINT', 'int16': 'QTYPE_QINT', 'int32': 'QTYPE_QINT', 'int64': 'QTYPE_QINT', 'uint8': 'QTYPE_QINT', 'uint16': 'QTYPE_QINT', 'uint32': 'QTYPE_QINT', 'uint64': 'QTYPE_QINT', 'size': 'QTYPE_QINT', 'any': None, # any QType possible, actually 'QType': 'QTYPE_QSTRING', } # Whitelist of commands allowed to return a non-dictionary returns_whitelist = [ # From QMP: 'human-monitor-command', 'qom-get', 'query-migrate-cache-size', 'query-tpm-models', 'query-tpm-types', 'ringbuf-read', # From QGA: 'guest-file-open', 'guest-fsfreeze-freeze', 'guest-fsfreeze-freeze-list', 'guest-fsfreeze-status', 'guest-fsfreeze-thaw', 'guest-get-time', 'guest-set-vcpus', 'guest-sync', 'guest-sync-delimited', ] # Whitelist of entities allowed to violate case conventions case_whitelist = [ # From QMP: 'ACPISlotType', # DIMM, visible through query-acpi-ospm-status 'CpuInfoBase', # CPU, visible through query-cpu 'CpuInfoMIPS', # PC, visible through query-cpu 'CpuInfoTricore', # PC, visible through query-cpu 'QapiErrorClass', # all members, visible through errors 'UuidInfo', # UUID, visible through query-uuid 'X86CPURegister32', # all members, visible indirectly through qom-get ] enum_types = [] struct_types = [] union_types = [] events = [] all_names = {} # # Parsing the schema into expressions # def error_path(parent): res = "" while parent: res = ("In file included from %s:%d:\n" % (parent['file'], parent['line'])) + res parent = parent['parent'] return res class QAPISchemaError(Exception): def __init__(self, schema, msg): Exception.__init__(self) self.fname = schema.fname self.msg = msg self.col = 1 self.line = schema.line for ch in schema.src[schema.line_pos:schema.pos]: if ch == '\t': self.col = (self.col + 7) % 8 + 1 else: self.col += 1 self.info = schema.incl_info def __str__(self): return error_path(self.info) + \ "%s:%d:%d: %s" % (self.fname, self.line, self.col, self.msg) class QAPIExprError(Exception): def __init__(self, expr_info, msg): Exception.__init__(self) assert expr_info self.info = expr_info self.msg = msg def __str__(self): return error_path(self.info['parent']) + \ "%s:%d: %s" % (self.info['file'], self.info['line'], self.msg) class QAPISchemaParser(object): def __init__(self, fp, previously_included=[], incl_info=None): abs_fname = os.path.abspath(fp.name) fname = fp.name self.fname = fname previously_included.append(abs_fname) self.incl_info = incl_info self.src = fp.read() if self.src == '' or self.src[-1] != '\n': self.src += '\n' self.cursor = 0 self.line = 1 self.line_pos = 0 self.exprs = [] self.accept() while self.tok is not None: 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: raise QAPIExprError(expr_info, "Invalid 'include' directive") include = expr["include"] if not isinstance(include, str): raise QAPIExprError(expr_info, "Value of 'include' must be a string") incl_abs_fname = os.path.join(os.path.dirname(abs_fname), include) # 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 incl_abs_fname in previously_included: continue try: fobj = open(incl_abs_fname, 'r') except IOError as e: raise QAPIExprError(expr_info, '%s: %s' % (e.strerror, include)) exprs_include = QAPISchemaParser(fobj, previously_included, expr_info) self.exprs.extend(exprs_include.exprs) else: expr_elem = {'expr': expr, 'info': expr_info} self.exprs.append(expr_elem) def accept(self): while True: self.tok = self.src[self.cursor] self.pos = self.cursor self.cursor += 1 self.val = None if self.tok == '#': self.cursor = self.src.find('\n', self.cursor) elif self.tok in "{}:,[]": return elif self.tok == "'": string = '' esc = False while True: ch = self.src[self.cursor] self.cursor += 1 if ch == '\n': raise QAPISchemaError(self, 'Missing terminating "\'"') if esc: if ch == 'b': string += '\b' elif ch == 'f': string += '\f' elif ch == 'n': string += '\n' elif ch == 'r': string += '\r' elif ch == 't': string += '\t' elif ch == 'u': value = 0 for _ in range(0, 4): ch = self.src[self.cursor] self.cursor += 1 if ch not in "0123456789abcdefABCDEF": raise QAPISchemaError(self, '\\u escape needs 4 ' 'hex digits') value = (value << 4) + int(ch, 16) # If Python 2 and 3 didn't disagree so much on # how to handle Unicode, then we could allow # Unicode string defaults. But most of QAPI is # ASCII-only, so we aren't losing much for now. if not value or value > 0x7f: raise QAPISchemaError(self, 'For now, \\u escape ' 'only supports non-zero ' 'values up to \\u007f') string += chr(value) elif ch in "\\/'\"": string += ch else: raise QAPISchemaError(self, "Unknown escape \\%s" % ch) esc = False elif ch == "\\": esc = True elif ch == "'": self.val = string return else: string += ch elif self.src.startswith("true", self.pos): self.val = True self.cursor += 3 return elif self.src.startswith("false", self.pos): self.val = False self.cursor += 4 return elif self.src.startswith("null", self.pos): self.val = None self.cursor += 3 return elif self.tok == '\n': if self.cursor == len(self.src): self.tok = None return self.line += 1 self.line_pos = self.cursor elif not self.tok.isspace(): raise QAPISchemaError(self, 'Stray "%s"' % self.tok) def get_members(self): expr = OrderedDict() if self.tok == '}': self.accept() return expr if self.tok != "'": raise QAPISchemaError(self, 'Expected string or "}"') while True: key = self.val self.accept() if self.tok != ':': raise QAPISchemaError(self, 'Expected ":"') self.accept() if key in expr: raise QAPISchemaError(self, 'Duplicate key "%s"' % key) expr[key] = self.get_expr(True) if self.tok == '}': self.accept() return expr if self.tok != ',': raise QAPISchemaError(self, 'Expected "," or "}"') self.accept() if self.tok != "'": raise QAPISchemaError(self, 'Expected string') def get_values(self): expr = [] if self.tok == ']': self.accept() return expr if self.tok not in "{['tfn": raise QAPISchemaError(self, 'Expected "{", "[", "]", string, ' 'boolean or "null"') while True: expr.append(self.get_expr(True)) if self.tok == ']': self.accept() return expr if self.tok != ',': raise QAPISchemaError(self, 'Expected "," or "]"') self.accept() def get_expr(self, nested): if self.tok != '{' and not nested: raise QAPISchemaError(self, 'Expected "{"') if self.tok == '{': self.accept() expr = self.get_members() elif self.tok == '[': self.accept() expr = self.get_values() elif self.tok in "'tfn": expr = self.val self.accept() else: raise QAPISchemaError(self, 'Expected "{", "[" or string') return expr # # Semantic analysis of schema expressions # TODO fold into QAPISchema # TODO catching name collisions in generated code would be nice # def find_base_fields(base): base_struct_define = find_struct(base) if not base_struct_define: return None return base_struct_define['data'] # Return the qtype of an alternate branch, or None on error. def find_alternate_member_qtype(qapi_type): if qapi_type in builtin_types: return builtin_types[qapi_type] elif find_struct(qapi_type): return "QTYPE_QDICT" elif find_enum(qapi_type): return "QTYPE_QSTRING" elif find_union(qapi_type): return "QTYPE_QDICT" return None # Return the discriminator enum define if discriminator is specified as an # enum type, otherwise return None. def discriminator_find_enum_define(expr): base = expr.get('base') discriminator = expr.get('discriminator') if not (discriminator and base): return None base_fields = find_base_fields(base) if not base_fields: return None discriminator_type = base_fields.get(discriminator) if not discriminator_type: return None return find_enum(discriminator_type) # Names must be letters, numbers, -, and _. They must start with letter, # except for downstream extensions which must start with __RFQDN_. # Dots are only valid in the downstream extension prefix. valid_name = re.compile('^(__[a-zA-Z0-9.-]+_)?' '[a-zA-Z][a-zA-Z0-9_-]*$') def check_name(expr_info, source, name, allow_optional=False, enum_member=False): global valid_name membername = name if not isinstance(name, str): raise QAPIExprError(expr_info, "%s requires a string name" % source) if name.startswith('*'): membername = name[1:] if not allow_optional: raise QAPIExprError(expr_info, "%s does not allow optional name '%s'" % (source, name)) # Enum members can start with a digit, because the generated C # code always prefixes it with the enum name if enum_member and membername[0].isdigit(): membername = 'D' + membername # Reserve the entire 'q_' namespace for c_name() if not valid_name.match(membername) or \ c_name(membername, False).startswith('q_'): 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) # FIXME should reject names that differ only in '_' vs. '.' # vs. '-', because they're liable to clash in generated C. if name in all_names: raise QAPIExprError(info, "%s '%s' is already defined" % (all_names[name], name)) if not implicit and (name.endswith('Kind') or name.endswith('List')): raise QAPIExprError(info, "%s '%s' should not end in '%s'" % (meta, name, name[-4:])) 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) is not None def check_type(expr_info, source, value, allow_array=False, allow_dict=False, allow_optional=False, allow_metas=[]): global all_names if value is None: return # Check if array type for value is okay if isinstance(value, list): if not allow_array: raise QAPIExprError(expr_info, "%s cannot be an array" % source) if len(value) != 1 or not isinstance(value[0], str): raise QAPIExprError(expr_info, "%s: array type must contain single type name" % source) value = value[0] # Check if type name for value is okay if isinstance(value, str): if value not in all_names: raise QAPIExprError(expr_info, "%s uses unknown type '%s'" % (source, value)) if not all_names[value] in allow_metas: raise QAPIExprError(expr_info, "%s cannot use %s type '%s'" % (source, all_names[value], value)) return if not allow_dict: raise QAPIExprError(expr_info, "%s should be a type name" % source) if not isinstance(value, OrderedDict): raise QAPIExprError(expr_info, "%s should be a dictionary or type name" % source) # value is a dictionary, check that each member is okay for (key, arg) in value.items(): check_name(expr_info, "Member of %s" % source, key, allow_optional=allow_optional) if c_name(key, False) == 'u' or c_name(key, False).startswith('has_'): raise QAPIExprError(expr_info, "Member of %s uses reserved name '%s'" % (source, key)) # Todo: allow dictionaries to represent default values of # an optional argument. check_type(expr_info, "Member '%s' of %s" % (key, source), arg, allow_array=True, allow_metas=['built-in', 'union', 'alternate', 'struct', 'enum']) def check_command(expr, expr_info): name = expr['command'] check_type(expr_info, "'data' for command '%s'" % name, expr.get('data'), allow_dict=True, allow_optional=True, allow_metas=['struct']) returns_meta = ['union', 'struct'] if name in returns_whitelist: returns_meta += ['built-in', 'alternate', 'enum'] check_type(expr_info, "'returns' for command '%s'" % name, expr.get('returns'), allow_array=True, allow_optional=True, allow_metas=returns_meta) def check_event(expr, expr_info): global events name = expr['event'] events.append(name) check_type(expr_info, "'data' for event '%s'" % name, expr.get('data'), allow_dict=True, allow_optional=True, allow_metas=['struct']) def check_union(expr, expr_info): name = expr['union'] base = expr.get('base') discriminator = expr.get('discriminator') members = expr['data'] # Two types of unions, determined by discriminator. # With no discriminator it is a simple union. if discriminator is None: enum_define = None allow_metas = ['built-in', 'union', 'alternate', 'struct', 'enum'] if base is not None: raise QAPIExprError(expr_info, "Simple union '%s' must not have a base" % name) # Else, it's a flat union. else: # The object must have a string member 'base'. check_type(expr_info, "'base' for union '%s'" % name, base, allow_metas=['struct']) if not base: raise QAPIExprError(expr_info, "Flat union '%s' must have a base" % name) base_fields = find_base_fields(base) assert base_fields # The value of member 'discriminator' must name a non-optional # member of the base struct. check_name(expr_info, "Discriminator of flat union '%s'" % name, discriminator) discriminator_type = base_fields.get(discriminator) if not discriminator_type: raise QAPIExprError(expr_info, "Discriminator '%s' is not a member of base " "struct '%s'" % (discriminator, base)) enum_define = find_enum(discriminator_type) allow_metas = ['struct'] # Do not allow string discriminator if not enum_define: raise QAPIExprError(expr_info, "Discriminator '%s' must be of enumeration " "type" % discriminator) # Check every branch; don't allow an empty union if len(members) == 0: raise QAPIExprError(expr_info, "Union '%s' cannot have empty 'data'" % name) for (key, value) in members.items(): check_name(expr_info, "Member of union '%s'" % name, key) # Each value must name a known type check_type(expr_info, "Member '%s' of union '%s'" % (key, name), value, allow_array=not base, allow_metas=allow_metas) # If the discriminator names an enum type, then all members # of 'data' must also be members of the enum type. if enum_define: if key not in enum_define['enum_values']: raise QAPIExprError(expr_info, "Discriminator value '%s' is not found in " "enum '%s'" % (key, enum_define["enum_name"])) def check_alternate(expr, expr_info): name = expr['alternate'] members = expr['data'] types_seen = {} # Check every branch; require at least two branches if len(members) < 2: raise QAPIExprError(expr_info, "Alternate '%s' should have at least two branches " "in 'data'" % name) for (key, value) in members.items(): check_name(expr_info, "Member of alternate '%s'" % name, key) # Ensure alternates have no type conflicts. check_type(expr_info, "Member '%s' of alternate '%s'" % (key, name), value, allow_metas=['built-in', 'union', 'struct', 'enum']) qtype = find_alternate_member_qtype(value) if not qtype: raise QAPIExprError(expr_info, "Alternate '%s' member '%s' cannot use " "type '%s'" % (name, key, value)) if qtype in types_seen: raise QAPIExprError(expr_info, "Alternate '%s' member '%s' can't " "be distinguished from member '%s'" % (name, key, types_seen[qtype])) types_seen[qtype] = key def check_enum(expr, expr_info): name = expr['enum'] members = expr.get('data') prefix = expr.get('prefix') if not isinstance(members, list): raise QAPIExprError(expr_info, "Enum '%s' requires an array for 'data'" % name) if prefix is not None and not isinstance(prefix, str): raise QAPIExprError(expr_info, "Enum '%s' requires a string for 'prefix'" % name) for member in members: check_name(expr_info, "Member of enum '%s'" % name, member, enum_member=True) def check_struct(expr, expr_info): name = expr['struct'] members = expr['data'] check_type(expr_info, "'data' for struct '%s'" % name, members, allow_dict=True, allow_optional=True) check_type(expr_info, "'base' for struct '%s'" % name, expr.get('base'), allow_metas=['struct']) def check_keys(expr_elem, meta, required, optional=[]): expr = expr_elem['expr'] info = expr_elem['info'] name = expr[meta] if not isinstance(name, str): raise QAPIExprError(info, "'%s' key must have a string value" % meta) required = required + [meta] for (key, value) in expr.items(): if key not in required and key not in optional: raise QAPIExprError(info, "Unknown key '%s' in %s '%s'" % (key, meta, name)) if (key == 'gen' or key == 'success-response') and value is not False: raise QAPIExprError(info, "'%s' of %s '%s' should only use false value" % (key, meta, name)) for key in required: if key not in expr: raise QAPIExprError(info, "Key '%s' is missing from %s '%s'" % (key, meta, name)) def check_exprs(exprs): global all_names # 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 'enum' in expr: check_keys(expr_elem, 'enum', ['data'], ['prefix']) add_enum(expr['enum'], info, expr['data']) elif 'union' in expr: check_keys(expr_elem, 'union', ['data'], ['base', 'discriminator']) add_union(expr, info) elif 'alternate' in expr: check_keys(expr_elem, 'alternate', ['data']) add_name(expr['alternate'], info, 'alternate') elif 'struct' in expr: check_keys(expr_elem, 'struct', ['data'], ['base']) add_struct(expr, info) elif 'command' in expr: check_keys(expr_elem, 'command', [], ['data', 'returns', 'gen', 'success-response']) add_name(expr['command'], info, 'command') elif 'event' in expr: 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 'union' in expr: if not discriminator_find_enum_define(expr): add_enum('%sKind' % expr['union'], expr_elem['info'], implicit=True) elif 'alternate' in expr: 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 'enum' in expr: check_enum(expr, info) elif 'union' in expr: check_union(expr, info) elif 'alternate' in expr: check_alternate(expr, info) elif 'struct' in expr: check_struct(expr, info) elif 'command' in expr: check_command(expr, info) elif 'event' in expr: check_event(expr, info) else: assert False, 'unexpected meta type' return exprs # # Schema compiler frontend # class QAPISchemaEntity(object): def __init__(self, name, info): assert isinstance(name, str) self.name = name # For explicitly defined entities, info points to the (explicit) # definition. For builtins (and their arrays), info is None. # For implicitly defined entities, info points to a place that # triggered the implicit definition (there may be more than one # such place). self.info = info def c_name(self): return c_name(self.name) def check(self, schema): pass def is_implicit(self): return not self.info def visit(self, visitor): pass class QAPISchemaVisitor(object): def visit_begin(self, schema): pass def visit_end(self): pass def visit_needed(self, entity): # Default to visiting everything return True def visit_builtin_type(self, name, info, json_type): pass def visit_enum_type(self, name, info, values, prefix): pass def visit_array_type(self, name, info, element_type): pass def visit_object_type(self, name, info, base, members, variants): pass def visit_object_type_flat(self, name, info, members, variants): pass def visit_alternate_type(self, name, info, variants): pass def visit_command(self, name, info, arg_type, ret_type, gen, success_response): pass def visit_event(self, name, info, arg_type): pass class QAPISchemaType(QAPISchemaEntity): def c_type(self, is_param=False, is_unboxed=False): return c_name(self.name) + pointer_suffix def c_null(self): return 'NULL' def json_type(self): pass def alternate_qtype(self): json2qtype = { 'string': 'QTYPE_QSTRING', 'number': 'QTYPE_QFLOAT', 'int': 'QTYPE_QINT', 'boolean': 'QTYPE_QBOOL', 'object': 'QTYPE_QDICT' } return json2qtype.get(self.json_type()) class QAPISchemaBuiltinType(QAPISchemaType): def __init__(self, name, json_type, c_type, c_null): QAPISchemaType.__init__(self, name, None) assert not c_type or isinstance(c_type, str) assert json_type in ('string', 'number', 'int', 'boolean', 'null', 'value') self._json_type_name = json_type self._c_type_name = c_type self._c_null_val = c_null def c_name(self): return self.name def c_type(self, is_param=False, is_unboxed=False): if is_param and self.name == 'str': return 'const ' + self._c_type_name return self._c_type_name def c_null(self): return self._c_null_val def json_type(self): return self._json_type_name def visit(self, visitor): visitor.visit_builtin_type(self.name, self.info, self.json_type()) class QAPISchemaEnumType(QAPISchemaType): def __init__(self, name, info, values, prefix): QAPISchemaType.__init__(self, name, info) for v in values: assert isinstance(v, QAPISchemaMember) v.set_owner(name) assert prefix is None or isinstance(prefix, str) self.values = values self.prefix = prefix def check(self, schema): seen = {} for v in self.values: v.check_clash(self.info, seen) def is_implicit(self): # See QAPISchema._make_implicit_enum_type() return self.name.endswith('Kind') def c_type(self, is_param=False, is_unboxed=False): return c_name(self.name) def member_names(self): return [v.name for v in self.values] def c_null(self): return c_enum_const(self.name, (self.member_names() + ['_MAX'])[0], self.prefix) def json_type(self): return 'string' def visit(self, visitor): visitor.visit_enum_type(self.name, self.info, self.member_names(), self.prefix) class QAPISchemaArrayType(QAPISchemaType): def __init__(self, name, info, element_type): QAPISchemaType.__init__(self, name, info) assert isinstance(element_type, str) self._element_type_name = element_type self.element_type = None def check(self, schema): self.element_type = schema.lookup_type(self._element_type_name) assert self.element_type def is_implicit(self): return True def json_type(self): return 'array' def visit(self, visitor): visitor.visit_array_type(self.name, self.info, self.element_type) class QAPISchemaObjectType(QAPISchemaType): def __init__(self, name, info, base, local_members, variants): # struct has local_members, optional base, and no variants # flat union has base, variants, and no local_members # simple union has local_members, variants, and no base QAPISchemaType.__init__(self, name, info) assert base is None or isinstance(base, str) for m in local_members: assert isinstance(m, QAPISchemaObjectTypeMember) m.set_owner(name) if variants is not None: assert isinstance(variants, QAPISchemaObjectTypeVariants) variants.set_owner(name) self._base_name = base self.base = None self.local_members = local_members self.variants = variants self.members = None def check(self, schema): if self.members is False: # check for cycles raise QAPIExprError(self.info, "Object %s contains itself" % self.name) if self.members: return self.members = False # mark as being checked seen = OrderedDict() if self._base_name: self.base = schema.lookup_type(self._base_name) assert isinstance(self.base, QAPISchemaObjectType) self.base.check(schema) self.base.check_clash(schema, self.info, seen) for m in self.local_members: m.check(schema) m.check_clash(self.info, seen) self.members = seen.values() if self.variants: self.variants.check(schema, seen) assert self.variants.tag_member in self.members self.variants.check_clash(schema, self.info, seen) # Check that the members of this type do not cause duplicate JSON fields, # and update seen to track the members seen so far. Report any errors # on behalf of info, which is not necessarily self.info def check_clash(self, schema, info, seen): assert not self.variants # not implemented for m in self.members: m.check_clash(info, seen) def is_implicit(self): # See QAPISchema._make_implicit_object_type() return self.name[0] == ':' def c_name(self): assert not self.is_implicit() return QAPISchemaType.c_name(self) def c_type(self, is_param=False, is_unboxed=False): assert not self.is_implicit() if is_unboxed: return c_name(self.name) return c_name(self.name) + pointer_suffix def json_type(self): return 'object' def visit(self, visitor): visitor.visit_object_type(self.name, self.info, self.base, self.local_members, self.variants) visitor.visit_object_type_flat(self.name, self.info, self.members, self.variants) class QAPISchemaMember(object): role = 'member' def __init__(self, name): assert isinstance(name, str) self.name = name self.owner = None def set_owner(self, name): assert not self.owner self.owner = name def check_clash(self, info, seen): cname = c_name(self.name) if cname.lower() != cname and self.owner not in case_whitelist: raise QAPIExprError(info, "%s should not use uppercase" % self.describe()) if cname in seen: raise QAPIExprError(info, "%s collides with %s" % (self.describe(), seen[cname].describe())) seen[cname] = self def _pretty_owner(self): owner = self.owner if owner.startswith(':obj-'): # See QAPISchema._make_implicit_object_type() - reverse the # mapping there to create a nice human-readable description owner = owner[5:] if owner.endswith('-arg'): return '(parameter of %s)' % owner[:-4] else: assert owner.endswith('-wrapper') # Unreachable and not implemented assert False if owner.endswith('Kind'): # See QAPISchema._make_implicit_enum_type() return '(branch of %s)' % owner[:-4] return '(%s of %s)' % (self.role, owner) def describe(self): return "'%s' %s" % (self.name, self._pretty_owner()) class QAPISchemaObjectTypeMember(QAPISchemaMember): def __init__(self, name, typ, optional): QAPISchemaMember.__init__(self, name) assert isinstance(typ, str) assert isinstance(optional, bool) self._type_name = typ self.type = None self.optional = optional def check(self, schema): assert self.owner self.type = schema.lookup_type(self._type_name) assert self.type class QAPISchemaObjectTypeVariants(object): def __init__(self, tag_name, tag_member, variants): # Flat unions pass tag_name but not tag_member. # Simple unions and alternates pass tag_member but not tag_name. # After check(), tag_member is always set, and tag_name remains # a reliable witness of being used by a flat union. assert bool(tag_member) != bool(tag_name) assert (isinstance(tag_name, str) or isinstance(tag_member, QAPISchemaObjectTypeMember)) assert len(variants) > 0 for v in variants: assert isinstance(v, QAPISchemaObjectTypeVariant) self.tag_name = tag_name self.tag_member = tag_member self.variants = variants def set_owner(self, name): for v in self.variants: v.set_owner(name) def check(self, schema, seen): if not self.tag_member: # flat union self.tag_member = seen[c_name(self.tag_name)] assert self.tag_name == self.tag_member.name assert isinstance(self.tag_member.type, QAPISchemaEnumType) for v in self.variants: v.check(schema) # Union names must match enum values; alternate names are # checked separately. Use 'seen' to tell the two apart. if seen: assert v.name in self.tag_member.type.member_names() assert isinstance(v.type, QAPISchemaObjectType) v.type.check(schema) def check_clash(self, schema, info, seen): for v in self.variants: # Reset seen map for each variant, since qapi names from one # branch do not affect another branch assert isinstance(v.type, QAPISchemaObjectType) v.type.check_clash(schema, info, dict(seen)) class QAPISchemaObjectTypeVariant(QAPISchemaObjectTypeMember): role = 'branch' def __init__(self, name, typ): QAPISchemaObjectTypeMember.__init__(self, name, typ, False) # This function exists to support ugly simple union special cases # TODO get rid of them, and drop the function def simple_union_type(self): if (self.type.is_implicit() and isinstance(self.type, QAPISchemaObjectType)): assert len(self.type.members) == 1 assert not self.type.variants return self.type.members[0].type return None class QAPISchemaAlternateType(QAPISchemaType): def __init__(self, name, info, variants): QAPISchemaType.__init__(self, name, info) assert isinstance(variants, QAPISchemaObjectTypeVariants) assert not variants.tag_name variants.set_owner(name) variants.tag_member.set_owner(self.name) self.variants = variants def check(self, schema): self.variants.tag_member.check(schema) # Not calling self.variants.check_clash(), because there's nothing # to clash with self.variants.check(schema, {}) # Alternate branch names have no relation to the tag enum values; # so we have to check for potential name collisions ourselves. seen = {} for v in self.variants.variants: v.check_clash(self.info, seen) def json_type(self): return 'value' def visit(self, visitor): visitor.visit_alternate_type(self.name, self.info, self.variants) class QAPISchemaCommand(QAPISchemaEntity): def __init__(self, name, info, arg_type, ret_type, gen, success_response): QAPISchemaEntity.__init__(self, name, info) assert not arg_type or isinstance(arg_type, str) assert not ret_type or isinstance(ret_type, str) self._arg_type_name = arg_type self.arg_type = None self._ret_type_name = ret_type self.ret_type = None self.gen = gen self.success_response = success_response def check(self, schema): if self._arg_type_name: self.arg_type = schema.lookup_type(self._arg_type_name) assert isinstance(self.arg_type, QAPISchemaObjectType) assert not self.arg_type.variants # not implemented if self._ret_type_name: self.ret_type = schema.lookup_type(self._ret_type_name) assert isinstance(self.ret_type, QAPISchemaType) def visit(self, visitor): visitor.visit_command(self.name, self.info, self.arg_type, self.ret_type, self.gen, self.success_response) class QAPISchemaEvent(QAPISchemaEntity): def __init__(self, name, info, arg_type): QAPISchemaEntity.__init__(self, name, info) assert not arg_type or isinstance(arg_type, str) self._arg_type_name = arg_type self.arg_type = None def check(self, schema): if self._arg_type_name: self.arg_type = schema.lookup_type(self._arg_type_name) assert isinstance(self.arg_type, QAPISchemaObjectType) assert not self.arg_type.variants # not implemented def visit(self, visitor): visitor.visit_event(self.name, self.info, self.arg_type) class QAPISchema(object): def __init__(self, fname): try: self.exprs = check_exprs(QAPISchemaParser(open(fname, "r")).exprs) self._entity_dict = {} self._predefining = True self._def_predefineds() self._predefining = False self._def_exprs() self.check() except (QAPISchemaError, QAPIExprError) as err: print >>sys.stderr, err exit(1) def _def_entity(self, ent): # Only the predefined types are allowed to not have info assert ent.info or self._predefining assert ent.name not in self._entity_dict self._entity_dict[ent.name] = ent def lookup_entity(self, name, typ=None): ent = self._entity_dict.get(name) if typ and not isinstance(ent, typ): return None return ent def lookup_type(self, name): return self.lookup_entity(name, QAPISchemaType) def _def_builtin_type(self, name, json_type, c_type, c_null): self._def_entity(QAPISchemaBuiltinType(name, json_type, c_type, c_null)) # TODO As long as we have QAPI_TYPES_BUILTIN to share multiple # qapi-types.h from a single .c, all arrays of builtins must be # declared in the first file whether or not they are used. Nicer # would be to use lazy instantiation, while figuring out how to # avoid compilation issues with multiple qapi-types.h. self._make_array_type(name, None) def _def_predefineds(self): for t in [('str', 'string', 'char' + pointer_suffix, 'NULL'), ('number', 'number', 'double', '0'), ('int', 'int', 'int64_t', '0'), ('int8', 'int', 'int8_t', '0'), ('int16', 'int', 'int16_t', '0'), ('int32', 'int', 'int32_t', '0'), ('int64', 'int', 'int64_t', '0'), ('uint8', 'int', 'uint8_t', '0'), ('uint16', 'int', 'uint16_t', '0'), ('uint32', 'int', 'uint32_t', '0'), ('uint64', 'int', 'uint64_t', '0'), ('size', 'int', 'uint64_t', '0'), ('bool', 'boolean', 'bool', 'false'), ('any', 'value', 'QObject' + pointer_suffix, 'NULL')]: self._def_builtin_type(*t) self.the_empty_object_type = QAPISchemaObjectType(':empty', None, None, [], None) self._def_entity(self.the_empty_object_type) qtype_values = self._make_enum_members(['none', 'qnull', 'qint', 'qstring', 'qdict', 'qlist', 'qfloat', 'qbool']) self._def_entity(QAPISchemaEnumType('QType', None, qtype_values, 'QTYPE')) def _make_enum_members(self, values): return [QAPISchemaMember(v) for v in values] def _make_implicit_enum_type(self, name, info, values): # See also QAPISchemaObjectTypeMember._pretty_owner() name = name + 'Kind' # Use namespace reserved by add_name() self._def_entity(QAPISchemaEnumType( name, info, self._make_enum_members(values), None)) return name def _make_array_type(self, element_type, info): name = element_type + 'List' # Use namespace reserved by add_name() if not self.lookup_type(name): self._def_entity(QAPISchemaArrayType(name, info, element_type)) return name def _make_implicit_object_type(self, name, info, role, members): if not members: return None # See also QAPISchemaObjectTypeMember._pretty_owner() name = ':obj-%s-%s' % (name, role) if not self.lookup_entity(name, QAPISchemaObjectType): self._def_entity(QAPISchemaObjectType(name, info, None, members, None)) return name def _def_enum_type(self, expr, info): name = expr['enum'] data = expr['data'] prefix = expr.get('prefix') self._def_entity(QAPISchemaEnumType( name, info, self._make_enum_members(data), prefix)) def _make_member(self, name, typ, info): optional = False if name.startswith('*'): name = name[1:] optional = True if isinstance(typ, list): assert len(typ) == 1 typ = self._make_array_type(typ[0], info) return QAPISchemaObjectTypeMember(name, typ, optional) def _make_members(self, data, info): return [self._make_member(key, value, info) for (key, value) in data.iteritems()] def _def_struct_type(self, expr, info): name = expr['struct'] base = expr.get('base') data = expr['data'] self._def_entity(QAPISchemaObjectType(name, info, base, self._make_members(data, info), None)) def _make_variant(self, case, typ): return QAPISchemaObjectTypeVariant(case, typ) def _make_simple_variant(self, case, typ, info): if isinstance(typ, list): assert len(typ) == 1 typ = self._make_array_type(typ[0], info) typ = self._make_implicit_object_type( typ, info, 'wrapper', [self._make_member('data', typ, info)]) return QAPISchemaObjectTypeVariant(case, typ) def _def_union_type(self, expr, info): name = expr['union'] data = expr['data'] base = expr.get('base') tag_name = expr.get('discriminator') tag_member = None if tag_name: variants = [self._make_variant(key, value) for (key, value) in data.iteritems()] members = [] else: variants = [self._make_simple_variant(key, value, info) for (key, value) in data.iteritems()] typ = self._make_implicit_enum_type(name, info, [v.name for v in variants]) tag_member = QAPISchemaObjectTypeMember('type', typ, False) members = [tag_member] self._def_entity( QAPISchemaObjectType(name, info, base, members, QAPISchemaObjectTypeVariants(tag_name, tag_member, variants))) def _def_alternate_type(self, expr, info): name = expr['alternate'] data = expr['data'] variants = [self._make_variant(key, value) for (key, value) in data.iteritems()] tag_member = QAPISchemaObjectTypeMember('type', 'QType', False) self._def_entity( QAPISchemaAlternateType(name, info, QAPISchemaObjectTypeVariants(None, tag_member, variants))) def _def_command(self, expr, info): name = expr['command'] data = expr.get('data') rets = expr.get('returns') gen = expr.get('gen', True) success_response = expr.get('success-response', True) if isinstance(data, OrderedDict): data = self._make_implicit_object_type( name, info, 'arg', self._make_members(data, info)) if isinstance(rets, list): assert len(rets) == 1 rets = self._make_array_type(rets[0], info) self._def_entity(QAPISchemaCommand(name, info, data, rets, gen, success_response)) def _def_event(self, expr, info): name = expr['event'] data = expr.get('data') if isinstance(data, OrderedDict): data = self._make_implicit_object_type( name, info, 'arg', self._make_members(data, info)) self._def_entity(QAPISchemaEvent(name, info, data)) def _def_exprs(self): for expr_elem in self.exprs: expr = expr_elem['expr'] info = expr_elem['info'] if 'enum' in expr: self._def_enum_type(expr, info) elif 'struct' in expr: self._def_struct_type(expr, info) elif 'union' in expr: self._def_union_type(expr, info) elif 'alternate' in expr: self._def_alternate_type(expr, info) elif 'command' in expr: self._def_command(expr, info) elif 'event' in expr: self._def_event(expr, info) else: assert False def check(self): for ent in self._entity_dict.values(): ent.check(self) def visit(self, visitor): visitor.visit_begin(self) for (name, entity) in sorted(self._entity_dict.items()): if visitor.visit_needed(entity): entity.visit(visitor) visitor.visit_end() # # Code generation helpers # def camel_case(name): new_name = '' first = True for ch in name: if ch in ['_', '-']: first = True elif first: new_name += ch.upper() first = False else: new_name += ch.lower() return new_name # ENUMName -> ENUM_NAME, EnumName1 -> ENUM_NAME1 # ENUM_NAME -> ENUM_NAME, ENUM_NAME1 -> ENUM_NAME1, ENUM_Name2 -> ENUM_NAME2 # ENUM24_Name -> ENUM24_NAME def camel_to_upper(value): c_fun_str = c_name(value, False) if value.isupper(): return c_fun_str new_name = '' l = len(c_fun_str) for i in range(l): c = c_fun_str[i] # When c is upper and no "_" appears before, do more checks if c.isupper() and (i > 0) and c_fun_str[i - 1] != "_": if i < l - 1 and c_fun_str[i + 1].islower(): new_name += '_' elif c_fun_str[i - 1].isdigit(): new_name += '_' new_name += c return new_name.lstrip('_').upper() def c_enum_const(type_name, const_name, prefix=None): if prefix is not None: type_name = prefix return camel_to_upper(type_name) + '_' + c_name(const_name, False).upper() c_name_trans = string.maketrans('.-', '__') # Map @name to a valid C identifier. # If @protect, avoid returning certain ticklish identifiers (like # C keywords) by prepending "q_". # # Used for converting 'name' from a 'name':'type' qapi definition # into a generated struct member, as well as converting type names # into substrings of a generated C function name. # '__a.b_c' -> '__a_b_c', 'x-foo' -> 'x_foo' # protect=True: 'int' -> 'q_int'; protect=False: 'int' -> 'int' def c_name(name, protect=True): # ANSI X3J11/88-090, 3.1.1 c89_words = set(['auto', 'break', 'case', 'char', 'const', 'continue', 'default', 'do', 'double', 'else', 'enum', 'extern', 'float', 'for', 'goto', 'if', 'int', 'long', 'register', 'return', 'short', 'signed', 'sizeof', 'static', 'struct', 'switch', 'typedef', 'union', 'unsigned', 'void', 'volatile', 'while']) # ISO/IEC 9899:1999, 6.4.1 c99_words = set(['inline', 'restrict', '_Bool', '_Complex', '_Imaginary']) # ISO/IEC 9899:2011, 6.4.1 c11_words = set(['_Alignas', '_Alignof', '_Atomic', '_Generic', '_Noreturn', '_Static_assert', '_Thread_local']) # GCC http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/C-Extensions.html # excluding _.* gcc_words = set(['asm', 'typeof']) # C++ ISO/IEC 14882:2003 2.11 cpp_words = set(['bool', 'catch', 'class', 'const_cast', 'delete', 'dynamic_cast', 'explicit', 'false', 'friend', 'mutable', 'namespace', 'new', 'operator', 'private', 'protected', 'public', 'reinterpret_cast', 'static_cast', 'template', 'this', 'throw', 'true', 'try', 'typeid', 'typename', 'using', 'virtual', 'wchar_t', # alternative representations 'and', 'and_eq', 'bitand', 'bitor', 'compl', 'not', 'not_eq', 'or', 'or_eq', 'xor', 'xor_eq']) # namespace pollution: polluted_words = set(['unix', 'errno', 'mips', 'sparc']) name = name.translate(c_name_trans) if protect and (name in c89_words | c99_words | c11_words | gcc_words | cpp_words | polluted_words): return "q_" + name return name eatspace = '\033EATSPACE.' pointer_suffix = ' *' + eatspace def genindent(count): ret = "" for _ in range(count): ret += " " return ret indent_level = 0 def push_indent(indent_amount=4): global indent_level indent_level += indent_amount def pop_indent(indent_amount=4): global indent_level indent_level -= indent_amount # Generate @code with @kwds interpolated. # Obey indent_level, and strip eatspace. def cgen(code, **kwds): raw = code % kwds if indent_level: indent = genindent(indent_level) # re.subn() lacks flags support before Python 2.7, use re.compile() raw = re.subn(re.compile("^.", re.MULTILINE), indent + r'\g<0>', raw) raw = raw[0] return re.sub(re.escape(eatspace) + ' *', '', raw) def mcgen(code, **kwds): if code[0] == '\n': code = code[1:] return cgen(code, **kwds) def guardname(filename): return c_name(filename, protect=False).upper() def guardstart(name): return mcgen(''' #ifndef %(name)s #define %(name)s ''', name=guardname(name)) def guardend(name): return mcgen(''' #endif /* %(name)s */ ''', name=guardname(name)) def gen_enum_lookup(name, values, prefix=None): ret = mcgen(''' const char *const %(c_name)s_lookup[] = { ''', c_name=c_name(name)) for value in values: index = c_enum_const(name, value, prefix) ret += mcgen(''' [%(index)s] = "%(value)s", ''', index=index, value=value) max_index = c_enum_const(name, '_MAX', prefix) ret += mcgen(''' [%(max_index)s] = NULL, }; ''', max_index=max_index) return ret def gen_enum(name, values, prefix=None): # append automatically generated _MAX value enum_values = values + ['_MAX'] ret = mcgen(''' typedef enum %(c_name)s { ''', c_name=c_name(name)) i = 0 for value in enum_values: ret += mcgen(''' %(c_enum)s = %(i)d, ''', c_enum=c_enum_const(name, value, prefix), i=i) i += 1 ret += mcgen(''' } %(c_name)s; ''', c_name=c_name(name)) ret += mcgen(''' extern const char *const %(c_name)s_lookup[]; ''', c_name=c_name(name)) return ret def gen_params(arg_type, extra): if not arg_type: return extra assert not arg_type.variants ret = '' sep = '' for memb in arg_type.members: ret += sep sep = ', ' if memb.optional: ret += 'bool has_%s, ' % c_name(memb.name) ret += '%s %s' % (memb.type.c_type(is_param=True), c_name(memb.name)) if extra: ret += sep + extra return ret def gen_err_check(label='out', skiperr=False): if skiperr: return '' return mcgen(''' if (err) { goto %(label)s; } ''', label=label) def gen_visit_fields(members, prefix='', need_cast=False, skiperr=False, label='out'): ret = '' if skiperr: errparg = 'NULL' else: errparg = '&err' for memb in members: if memb.optional: ret += mcgen(''' if (visit_optional(v, "%(name)s", &%(prefix)shas_%(c_name)s)) { ''', prefix=prefix, c_name=c_name(memb.name), name=memb.name) push_indent() # Ugly: sometimes we need to cast away const if need_cast and memb.type.name == 'str': cast = '(char **)' else: cast = '' ret += mcgen(''' visit_type_%(c_type)s(v, "%(name)s", %(cast)s&%(prefix)s%(c_name)s, %(errp)s); ''', c_type=memb.type.c_name(), prefix=prefix, cast=cast, c_name=c_name(memb.name), name=memb.name, errp=errparg) ret += gen_err_check(skiperr=skiperr, label=label) if memb.optional: pop_indent() ret += mcgen(''' } ''') return ret # # Common command line parsing # def parse_command_line(extra_options="", extra_long_options=[]): try: opts, args = getopt.gnu_getopt(sys.argv[1:], "chp:o:" + extra_options, ["source", "header", "prefix=", "output-dir="] + extra_long_options) except getopt.GetoptError as err: print >>sys.stderr, "%s: %s" % (sys.argv[0], str(err)) sys.exit(1) output_dir = "" prefix = "" do_c = False do_h = False extra_opts = [] for oa in opts: o, a = oa if o in ("-p", "--prefix"): match = re.match('([A-Za-z_.-][A-Za-z0-9_.-]*)?', a) if match.end() != len(a): print >>sys.stderr, \ "%s: 'funny character '%s' in argument of --prefix" \ % (sys.argv[0], a[match.end()]) sys.exit(1) prefix = a elif o in ("-o", "--output-dir"): output_dir = a + "/" elif o in ("-c", "--source"): do_c = True elif o in ("-h", "--header"): do_h = True else: extra_opts.append(oa) if not do_c and not do_h: do_c = True do_h = True if len(args) != 1: print >>sys.stderr, "%s: need exactly one argument" % sys.argv[0] sys.exit(1) fname = args[0] 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): guard = guardname(prefix + h_file) c_file = output_dir + prefix + c_file h_file = output_dir + prefix + h_file if output_dir: try: os.makedirs(output_dir) except os.error as e: if e.errno != errno.EEXIST: raise def maybe_open(really, name, opt): if really: return open(name, opt) else: import StringIO return StringIO.StringIO() fdef = maybe_open(do_c, c_file, 'w') fdecl = maybe_open(do_h, h_file, 'w') fdef.write(mcgen(''' /* AUTOMATICALLY GENERATED, DO NOT MODIFY */ %(comment)s ''', comment=c_comment)) fdecl.write(mcgen(''' /* AUTOMATICALLY GENERATED, DO NOT MODIFY */ %(comment)s #ifndef %(guard)s #define %(guard)s ''', comment=h_comment, guard=guard)) return (fdef, fdecl) def close_output(fdef, fdecl): fdecl.write(''' #endif ''') fdecl.close() fdef.close()