# # QAPI helper library # # Copyright IBM, Corp. 2011 # Copyright (c) 2013-2015 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', } # Whitelist of commands allowed to return a non-dictionary returns_whitelist = [ # From QMP: 'human-monitor-command', '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', # From qapi-schema-test: 'user_def_cmd3', ] 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): 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): 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 != 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, 'Expected a file name (string), got: %s' % include) 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, 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 x 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 not self.tok 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 builtin_types.has_key(qapi_type): 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) # FIXME should enforce "other than downstream extensions [...], all # names should begin with a letter". valid_name = re.compile('^[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: membername = '_' + membername if not valid_name.match(membername): 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[-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 = []): global all_names if value is None: return if allow_star and value == '**': 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 == '**': raise QAPIExprError(expr_info, "%s uses '**' but did not request 'gen':false" % source) if not value 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) # 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_star=allow_star, allow_metas=['built-in', 'union', 'alternate', 'struct', 'enum']) def check_member_clash(expr_info, base_name, data, source = ""): base = find_struct(base_name) assert base base_members = base['data'] for key in data.keys(): if key.startswith('*'): key = key[1:] if key in base_members or "*" + key in base_members: raise QAPIExprError(expr_info, "Member name '%s'%s clashes with base '%s'" % (key, source, base_name)) if base.get('base'): check_member_clash(expr_info, base['base'], data, source) def check_command(expr, expr_info): name = expr['command'] allow_star = expr.has_key('gen') check_type(expr_info, "'data' for command '%s'" % name, expr.get('data'), allow_dict=True, allow_optional=True, allow_metas=['struct'], allow_star=allow_star) 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, allow_star=allow_star) def check_event(expr, expr_info): global events name = expr['event'] if name.upper() == 'MAX': raise QAPIExprError(expr_info, "Event name 'MAX' cannot be created") 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'] values = { 'MAX': '(automatic)' } # 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'. if not isinstance(base, str): raise QAPIExprError(expr_info, "Flat union '%s' must have a string base field" % name) base_fields = find_base_fields(base) if not base_fields: raise QAPIExprError(expr_info, "Base '%s' is not a valid struct" % base) # 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 for (key, value) in members.items(): check_name(expr_info, "Member of union '%s'" % name, key) # 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=not base, allow_metas=allow_metas) if base: branch_struct = find_struct(value) assert branch_struct check_member_clash(expr_info, base, branch_struct['data'], " of branch '%s'" % key) # If the discriminator names an enum type, then all members # of 'data' must also be members of the enum type. if enum_define: if not key in enum_define['enum_values']: raise QAPIExprError(expr_info, "Discriminator value '%s' is not found in " "enum '%s'" % (key, enum_define["enum_name"])) # Otherwise, check for conflicts in the generated enum else: c_key = camel_to_upper(key) if c_key in values: raise QAPIExprError(expr_info, "Union '%s' member '%s' clashes with '%s'" % (name, key, values[c_key])) values[c_key] = key def check_alternate(expr, expr_info): name = expr['alternate'] members = expr['data'] values = { 'MAX': '(automatic)' } types_seen = {} # Check every branch for (key, value) in members.items(): check_name(expr_info, "Member of alternate '%s'" % name, key) # Check for conflicts in the generated enum c_key = camel_to_upper(key) if c_key in values: raise QAPIExprError(expr_info, "Alternate '%s' member '%s' clashes with '%s'" % (name, key, values[c_key])) values[c_key] = 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) assert qtype 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') values = { 'MAX': '(automatic)' } 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) key = camel_to_upper(member) if key in values: raise QAPIExprError(expr_info, "Enum '%s' member '%s' clashes with '%s'" % (name, member, values[key])) values[key] = member 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']) if expr.get('base'): check_member_clash(expr_info, expr['base'], expr['data']) 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 not key in required and not key in optional: raise QAPIExprError(info, "Unknown key '%s' in %s '%s'" % (key, meta, name)) if (key == 'gen' or key == 'success-response') and value != False: raise QAPIExprError(info, "'%s' of %s '%s' should only use false value" % (key, meta, name)) for key in required: if not expr.has_key(key): 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 expr.has_key('enum'): check_keys(expr_elem, 'enum', ['data'], ['prefix']) 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 exprs # # Schema compiler frontend # class QAPISchemaEntity(object): def __init__(self, name, info): assert isinstance(name, str) self.name = name self.info = info def c_name(self): return c_name(self.name) def check(self, schema): pass def visit(self, visitor): pass class QAPISchemaVisitor(object): def visit_begin(self, schema): pass def visit_end(self): pass 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_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): 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): 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, str) assert prefix is None or isinstance(prefix, str) self.values = values self.prefix = prefix def check(self, schema): assert len(set(self.values)) == len(self.values) def c_type(self, is_param=False): return c_name(self.name) def c_null(self): return c_enum_const(self.name, (self.values + ['MAX'])[0], self.prefix) def json_type(self): return 'string' def visit(self, visitor): visitor.visit_enum_type(self.name, self.info, self.values, 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 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): QAPISchemaType.__init__(self, name, info) assert base is None or isinstance(base, str) for m in local_members: assert isinstance(m, QAPISchemaObjectTypeMember) assert (variants is None or isinstance(variants, QAPISchemaObjectTypeVariants)) self._base_name = base self.base = None self.local_members = local_members self.variants = variants self.members = None def check(self, schema): assert self.members is not False # not running in cycles if self.members: return self.members = False # mark as being checked if self._base_name: self.base = schema.lookup_type(self._base_name) assert isinstance(self.base, QAPISchemaObjectType) assert not self.base.variants # not implemented self.base.check(schema) members = list(self.base.members) else: members = [] seen = {} for m in members: seen[m.name] = m for m in self.local_members: m.check(schema, members, seen) if self.variants: self.variants.check(schema, members, seen) self.members = members def c_name(self): assert self.info return QAPISchemaType.c_name(self) def c_type(self, is_param=False): assert self.info return QAPISchemaType.c_type(self) 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) class QAPISchemaObjectTypeMember(object): def __init__(self, name, typ, optional): assert isinstance(name, str) assert isinstance(typ, str) assert isinstance(optional, bool) self.name = name self._type_name = typ self.type = None self.optional = optional def check(self, schema, all_members, seen): assert self.name not in seen self.type = schema.lookup_type(self._type_name) assert self.type all_members.append(self) seen[self.name] = self class QAPISchemaObjectTypeVariants(object): def __init__(self, tag_name, tag_enum, variants): assert tag_name is None or isinstance(tag_name, str) assert tag_enum is None or isinstance(tag_enum, str) for v in variants: assert isinstance(v, QAPISchemaObjectTypeVariant) self.tag_name = tag_name if tag_name: assert not tag_enum self.tag_member = None else: self.tag_member = QAPISchemaObjectTypeMember('type', tag_enum, False) self.variants = variants def check(self, schema, members, seen): if self.tag_name: self.tag_member = seen[self.tag_name] else: self.tag_member.check(schema, members, seen) assert isinstance(self.tag_member.type, QAPISchemaEnumType) for v in self.variants: vseen = dict(seen) v.check(schema, self.tag_member.type, vseen) class QAPISchemaObjectTypeVariant(QAPISchemaObjectTypeMember): def __init__(self, name, typ): QAPISchemaObjectTypeMember.__init__(self, name, typ, False) def check(self, schema, tag_type, seen): QAPISchemaObjectTypeMember.check(self, schema, [], seen) assert self.name in tag_type.values # 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 isinstance(self.type, QAPISchemaObjectType) and not self.type.info: 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 self.variants = variants def check(self, schema): self.variants.check(schema, [], {}) 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) except (QAPISchemaError, QAPIExprError), err: print >>sys.stderr, err exit(1) self._entity_dict = {} self._def_predefineds() self._def_exprs() self.check() def _def_entity(self, ent): 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)) if name != '**': self._make_array_type(name) # TODO really needed? 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'), ('**', 'value', None, None)]: self._def_builtin_type(*t) def _make_implicit_enum_type(self, name, values): name = name + 'Kind' self._def_entity(QAPISchemaEnumType(name, None, values, None)) return name def _make_array_type(self, element_type): name = element_type + 'List' if not self.lookup_type(name): self._def_entity(QAPISchemaArrayType(name, None, element_type)) return name def _make_implicit_object_type(self, name, role, members): if not members: return None name = ':obj-%s-%s' % (name, role) if not self.lookup_entity(name, QAPISchemaObjectType): self._def_entity(QAPISchemaObjectType(name, None, 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, data, prefix)) self._make_array_type(name) # TODO really needed? def _make_member(self, name, typ): 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]) return QAPISchemaObjectTypeMember(name, typ, optional) def _make_members(self, data): return [self._make_member(key, value) 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), None)) self._make_array_type(name) # TODO really needed? def _make_variant(self, case, typ): return QAPISchemaObjectTypeVariant(case, typ) def _make_simple_variant(self, case, typ): if isinstance(typ, list): assert len(typ) == 1 typ = self._make_array_type(typ[0]) typ = self._make_implicit_object_type(typ, 'wrapper', [self._make_member('data', typ)]) return QAPISchemaObjectTypeVariant(case, typ) def _make_tag_enum(self, type_name, variants): return self._make_implicit_enum_type(type_name, [v.name for v in variants]) def _def_union_type(self, expr, info): name = expr['union'] data = expr['data'] base = expr.get('base') tag_name = expr.get('discriminator') tag_enum = None if tag_name: variants = [self._make_variant(key, value) for (key, value) in data.iteritems()] else: variants = [self._make_simple_variant(key, value) for (key, value) in data.iteritems()] tag_enum = self._make_tag_enum(name, variants) self._def_entity( QAPISchemaObjectType(name, info, base, self._make_members(OrderedDict()), QAPISchemaObjectTypeVariants(tag_name, tag_enum, variants))) self._make_array_type(name) # TODO really needed? 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_enum = self._make_tag_enum(name, variants) self._def_entity( QAPISchemaAlternateType(name, info, QAPISchemaObjectTypeVariants(None, tag_enum, variants))) self._make_array_type(name) # TODO really needed? 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, 'arg', self._make_members(data)) if isinstance(rets, list): assert len(rets) == 1 rets = self._make_array_type(rets[0]) 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, 'arg', self._make_members(data)) 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 in sorted(self._entity_dict.keys()): self._entity_dict[name].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] != "_": # Case 1: next string is lower # Case 2: previous string is digit if (i < (l - 1) and c_fun_str[i + 1].islower()) or \ 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 + '_' + const_name) 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']) if protect and (name in c89_words | c99_words | c11_words | gcc_words | cpp_words | polluted_words): return "q_" + name return name.translate(c_name_trans) eatspace = '\033EATSPACE.' pointer_suffix = ' *' + eatspace def genindent(count): ret = "" for i 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(''' "%(value)s", ''', value=value) # Unicorn: We don't use C99 [ARRAY_INDICING] = Thing because # MSVC is still in the stone-age with this part of C compiler # support. max_index = c_enum_const(name, 'MAX', prefix) ret += mcgen(''' NULL, }; ''') 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 # # 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, 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, 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()