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qemu-e2k/scripts/qapi.py
Markus Armbruster c0644771eb qapi: Reject alternates that can't work with keyval_parse() 
Alternates are sum types like unions, but use the JSON type on the
wire / QType in QObject instead of an explicit tag.  That's why we
require alternate members to have distinct QTypes.

The recently introduced keyval_parse() (commit d454dbe) can only
produce string scalars.  The qobject_input_visitor_new_keyval() input
visitor mostly hides the difference, so code using a QObject input
visitor doesn't have to care whether its input was parsed from JSON or
KEY=VALUE,...  The difference leaks for alternates, as noted in commit
0ee9ae7: a non-string, non-enum scalar alternate value can't currently
be expressed.

In part, this is just our insufficiently sophisticated implementation.
Consider alternate type 'GuestFileWhence'.  It has an integer member
and a 'QGASeek' member.  The latter is an enumeration with values
'set', 'cur', 'end'.  The meaning of b=set, b=cur, b=end, b=0, b=1 and
so forth is perfectly obvious.  However, our current implementation
falls apart at run time for b=0, b=1, and so forth.  Fixable, but not
today; add a test case and a TODO comment.

Now consider an alternate type with a string and an integer member.
What's the meaning of a=42?  Is it the string "42" or the integer 42?
Whichever meaning you pick makes the other inexpressible.  This isn't
just an implementation problem, it's fundamental.  Our current
implementation will pick string.

So far, we haven't needed such alternates.  To make sure we stop and
think before we add one that cannot sanely work with keyval_parse(),
let's require alternate members to have sufficiently distinct
representation in KEY=VALUE,... syntax:

* A string member clashes with any other scalar member

* An enumeration member clashes with bool members when it has value
  'on' or 'off'.

* An enumeration member clashes with numeric members when it has a
  value that starts with '-', '+', or a decimal digit.  This is a
  rather lazy approximation of the actual number syntax accepted by
  the visitor.

  Note that enumeration values starting with '-' and '+' are rejected
  elsewhere already, but better safe than sorry.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1495471335-23707-5-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2017-05-31 16:04:09 +02:00

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#
# QAPI helper library
#
# Copyright IBM, Corp. 2011
# Copyright (c) 2013-2016 Red Hat Inc.
#
# Authors:
# Anthony Liguori <aliguori@us.ibm.com>
# Markus Armbruster <armbru@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2.
# See the COPYING file in the top-level directory.
import errno
import getopt
import os
import re
import string
import sys
from ordereddict import OrderedDict
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',
}
# Are documentation comments required?
doc_required = False
# Whitelist of commands allowed to return a non-dictionary
returns_whitelist = []
# Whitelist of entities allowed to violate case conventions
name_case_whitelist = []
enum_types = {}
struct_types = {}
union_types = {}
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 QAPIError(Exception):
def __init__(self, fname, line, col, incl_info, msg):
Exception.__init__(self)
self.fname = fname
self.line = line
self.col = col
self.info = incl_info
self.msg = msg
def __str__(self):
loc = '%s:%d' % (self.fname, self.line)
if self.col is not None:
loc += ':%s' % self.col
return error_path(self.info) + '%s: %s' % (loc, self.msg)
class QAPIParseError(QAPIError):
def __init__(self, parser, msg):
col = 1
for ch in parser.src[parser.line_pos:parser.pos]:
if ch == '\t':
col = (col + 7) % 8 + 1
else:
col += 1
QAPIError.__init__(self, parser.fname, parser.line, col,
parser.incl_info, msg)
class QAPISemError(QAPIError):
def __init__(self, info, msg):
QAPIError.__init__(self, info['file'], info['line'], None,
info['parent'], msg)
class QAPIDoc(object):
class Section(object):
def __init__(self, name=None):
# optional section name (argument/member or section name)
self.name = name
# the list of lines for this section
self.content = []
def append(self, line):
self.content.append(line)
def __repr__(self):
return '\n'.join(self.content).strip()
class ArgSection(Section):
def __init__(self, name):
QAPIDoc.Section.__init__(self, name)
self.member = None
def connect(self, member):
self.member = member
def __init__(self, parser, info):
# self.parser is used to report errors with QAPIParseError. The
# resulting error position depends on the state of the parser.
# It happens to be the beginning of the comment. More or less
# servicable, but action at a distance.
self.parser = parser
self.info = info
self.symbol = None
self.body = QAPIDoc.Section()
# dict mapping parameter name to ArgSection
self.args = OrderedDict()
# a list of Section
self.sections = []
# the current section
self.section = self.body
def has_section(self, name):
"""Return True if we have a section with this name."""
for i in self.sections:
if i.name == name:
return True
return False
def append(self, line):
"""Parse a comment line and add it to the documentation."""
line = line[1:]
if not line:
self._append_freeform(line)
return
if line[0] != ' ':
raise QAPIParseError(self.parser, "Missing space after #")
line = line[1:]
# FIXME not nice: things like '# @foo:' and '# @foo: ' aren't
# recognized, and get silently treated as ordinary text
if self.symbol:
self._append_symbol_line(line)
elif not self.body.content and line.startswith('@'):
if not line.endswith(':'):
raise QAPIParseError(self.parser, "Line should end with :")
self.symbol = line[1:-1]
# FIXME invalid names other than the empty string aren't flagged
if not self.symbol:
raise QAPIParseError(self.parser, "Invalid name")
else:
self._append_freeform(line)
def end_comment(self):
self._end_section()
def _append_symbol_line(self, line):
name = line.split(' ', 1)[0]
if name.startswith('@') and name.endswith(':'):
line = line[len(name)+1:]
self._start_args_section(name[1:-1])
elif name in ('Returns:', 'Since:',
# those are often singular or plural
'Note:', 'Notes:',
'Example:', 'Examples:',
'TODO:'):
line = line[len(name)+1:]
self._start_section(name[:-1])
self._append_freeform(line)
def _start_args_section(self, name):
# FIXME invalid names other than the empty string aren't flagged
if not name:
raise QAPIParseError(self.parser, "Invalid parameter name")
if name in self.args:
raise QAPIParseError(self.parser,
"'%s' parameter name duplicated" % name)
if self.sections:
raise QAPIParseError(self.parser,
"'@%s:' can't follow '%s' section"
% (name, self.sections[0].name))
self._end_section()
self.section = QAPIDoc.ArgSection(name)
self.args[name] = self.section
def _start_section(self, name=''):
if name in ('Returns', 'Since') and self.has_section(name):
raise QAPIParseError(self.parser,
"Duplicated '%s' section" % name)
self._end_section()
self.section = QAPIDoc.Section(name)
self.sections.append(self.section)
def _end_section(self):
if self.section:
contents = str(self.section)
if self.section.name and (not contents or contents.isspace()):
raise QAPIParseError(self.parser, "Empty doc section '%s'"
% self.section.name)
self.section = None
def _append_freeform(self, line):
in_arg = isinstance(self.section, QAPIDoc.ArgSection)
if (in_arg and self.section.content
and not self.section.content[-1]
and line and not line[0].isspace()):
self._start_section()
if (in_arg or not self.section.name
or not self.section.name.startswith('Example')):
line = line.strip()
match = re.match(r'(@\S+:)', line)
if match:
raise QAPIParseError(self.parser,
"'%s' not allowed in free-form documentation"
% match.group(1))
# TODO Drop this once the dust has settled
if (isinstance(self.section, QAPIDoc.ArgSection)
and '#optional' in line):
raise QAPISemError(self.info, "Please drop the #optional tag")
self.section.append(line)
def connect_member(self, member):
if member.name not in self.args:
# Undocumented TODO outlaw
self.args[member.name] = QAPIDoc.ArgSection(member.name)
self.args[member.name].connect(member)
def check_expr(self, expr):
if self.has_section('Returns') and 'command' not in expr:
raise QAPISemError(self.info,
"'Returns:' is only valid for commands")
def check(self):
bogus = [name for name, section in self.args.iteritems()
if not section.member]
if bogus:
raise QAPISemError(
self.info,
"The following documented members are not in "
"the declaration: %s" % ", ".join(bogus))
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.docs = []
self.cur_doc = None
self.accept()
while self.tok is not None:
info = {'file': fname, 'line': self.line,
'parent': self.incl_info}
if self.tok == '#':
self.reject_expr_doc()
self.cur_doc = self.get_doc(info)
self.docs.append(self.cur_doc)
continue
expr = self.get_expr(False)
if 'include' in expr:
self.reject_expr_doc()
if len(expr) != 1:
raise QAPISemError(info, "Invalid 'include' directive")
include = expr['include']
if not isinstance(include, str):
raise QAPISemError(info,
"Value of 'include' must be a string")
self._include(include, info, os.path.dirname(abs_fname),
previously_included)
elif "pragma" in expr:
self.reject_expr_doc()
if len(expr) != 1:
raise QAPISemError(info, "Invalid 'pragma' directive")
pragma = expr['pragma']
if not isinstance(pragma, dict):
raise QAPISemError(
info, "Value of 'pragma' must be a dictionary")
for name, value in pragma.iteritems():
self._pragma(name, value, info)
else:
expr_elem = {'expr': expr,
'info': info}
if self.cur_doc:
if not self.cur_doc.symbol:
raise QAPISemError(
self.cur_doc.info,
"Expression documentation required")
expr_elem['doc'] = self.cur_doc
self.exprs.append(expr_elem)
self.cur_doc = None
self.reject_expr_doc()
def reject_expr_doc(self):
if self.cur_doc and self.cur_doc.symbol:
raise QAPISemError(
self.cur_doc.info,
"Documentation for '%s' is not followed by the definition"
% self.cur_doc.symbol)
def _include(self, include, info, base_dir, previously_included):
incl_abs_fname = os.path.join(base_dir, include)
# catch inclusion cycle
inf = info
while inf:
if incl_abs_fname == os.path.abspath(inf['file']):
raise QAPISemError(info, "Inclusion loop for %s" % include)
inf = inf['parent']
# skip multiple include of the same file
if incl_abs_fname in previously_included:
return
try:
fobj = open(incl_abs_fname, 'r')
except IOError as e:
raise QAPISemError(info, '%s: %s' % (e.strerror, include))
exprs_include = QAPISchemaParser(fobj, previously_included, info)
self.exprs.extend(exprs_include.exprs)
self.docs.extend(exprs_include.docs)
def _pragma(self, name, value, info):
global doc_required, returns_whitelist, name_case_whitelist
if name == 'doc-required':
if not isinstance(value, bool):
raise QAPISemError(info,
"Pragma 'doc-required' must be boolean")
doc_required = value
elif name == 'returns-whitelist':
if (not isinstance(value, list)
or any([not isinstance(elt, str) for elt in value])):
raise QAPISemError(info,
"Pragma returns-whitelist must be"
" a list of strings")
returns_whitelist = value
elif name == 'name-case-whitelist':
if (not isinstance(value, list)
or any([not isinstance(elt, str) for elt in value])):
raise QAPISemError(info,
"Pragma name-case-whitelist must be"
" a list of strings")
name_case_whitelist = value
else:
raise QAPISemError(info, "Unknown pragma '%s'" % name)
def accept(self, skip_comment=True):
while True:
self.tok = self.src[self.cursor]
self.pos = self.cursor
self.cursor += 1
self.val = None
if self.tok == '#':
if self.src[self.cursor] == '#':
# Start of doc comment
skip_comment = False
self.cursor = self.src.find('\n', self.cursor)
if not skip_comment:
self.val = self.src[self.pos:self.cursor]
return
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 QAPIParseError(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 QAPIParseError(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 QAPIParseError(self,
'For now, \\u escape '
'only supports non-zero '
'values up to \\u007f')
string += chr(value)
elif ch in '\\/\'"':
string += ch
else:
raise QAPIParseError(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 QAPIParseError(self, 'Stray "%s"' % self.tok)
def get_members(self):
expr = OrderedDict()
if self.tok == '}':
self.accept()
return expr
if self.tok != "'":
raise QAPIParseError(self, 'Expected string or "}"')
while True:
key = self.val
self.accept()
if self.tok != ':':
raise QAPIParseError(self, 'Expected ":"')
self.accept()
if key in expr:
raise QAPIParseError(self, 'Duplicate key "%s"' % key)
expr[key] = self.get_expr(True)
if self.tok == '}':
self.accept()
return expr
if self.tok != ',':
raise QAPIParseError(self, 'Expected "," or "}"')
self.accept()
if self.tok != "'":
raise QAPIParseError(self, 'Expected string')
def get_values(self):
expr = []
if self.tok == ']':
self.accept()
return expr
if self.tok not in "{['tfn":
raise QAPIParseError(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 QAPIParseError(self, 'Expected "," or "]"')
self.accept()
def get_expr(self, nested):
if self.tok != '{' and not nested:
raise QAPIParseError(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 QAPIParseError(self, 'Expected "{", "[", string, '
'boolean or "null"')
return expr
def get_doc(self, info):
if self.val != '##':
raise QAPIParseError(self, "Junk after '##' at start of "
"documentation comment")
doc = QAPIDoc(self, info)
self.accept(False)
while self.tok == '#':
if self.val.startswith('##'):
# End of doc comment
if self.val != '##':
raise QAPIParseError(self, "Junk after '##' at end of "
"documentation comment")
doc.end_comment()
self.accept()
return doc
else:
doc.append(self.val)
self.accept(False)
raise QAPIParseError(self, "Documentation comment must end with '##'")
#
# Semantic analysis of schema expressions
# TODO fold into QAPISchema
# TODO catching name collisions in generated code would be nice
#
def find_base_members(base):
if isinstance(base, dict):
return base
base_struct_define = struct_types.get(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 qapi_type in struct_types:
return 'QTYPE_QDICT'
elif qapi_type in enum_types:
return 'QTYPE_QSTRING'
elif qapi_type in union_types:
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_members = find_base_members(base)
if not base_members:
return None
discriminator_type = base_members.get(discriminator)
if not discriminator_type:
return None
return enum_types.get(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(r'^(__[a-zA-Z0-9.-]+_)?'
'[a-zA-Z][a-zA-Z0-9_-]*$')
def check_name(info, source, name, allow_optional=False,
enum_member=False):
global valid_name
membername = name
if not isinstance(name, str):
raise QAPISemError(info, "%s requires a string name" % source)
if name.startswith('*'):
membername = name[1:]
if not allow_optional:
raise QAPISemError(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(), and for 'q_empty'
# and 'q_obj_*' implicit type names.
if not valid_name.match(membername) or \
c_name(membername, False).startswith('q_'):
raise QAPISemError(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 QAPISemError(info, "%s '%s' is already defined"
% (all_names[name], name))
if not implicit and (name.endswith('Kind') or name.endswith('List')):
raise QAPISemError(info, "%s '%s' should not end in '%s'"
% (meta, name, name[-4:]))
all_names[name] = meta
def check_type(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 QAPISemError(info, "%s cannot be an array" % source)
if len(value) != 1 or not isinstance(value[0], str):
raise QAPISemError(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 QAPISemError(info, "%s uses unknown type '%s'"
% (source, value))
if not all_names[value] in allow_metas:
raise QAPISemError(info, "%s cannot use %s type '%s'" %
(source, all_names[value], value))
return
if not allow_dict:
raise QAPISemError(info, "%s should be a type name" % source)
if not isinstance(value, OrderedDict):
raise QAPISemError(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(info, "Member of %s" % source, key,
allow_optional=allow_optional)
if c_name(key, False) == 'u' or c_name(key, False).startswith('has_'):
raise QAPISemError(info, "Member of %s uses reserved name '%s'"
% (source, key))
# Todo: allow dictionaries to represent default values of
# an optional argument.
check_type(info, "Member '%s' of %s" % (key, source), arg,
allow_array=True,
allow_metas=['built-in', 'union', 'alternate', 'struct',
'enum'])
def check_command(expr, info):
name = expr['command']
boxed = expr.get('boxed', False)
args_meta = ['struct']
if boxed:
args_meta += ['union', 'alternate']
check_type(info, "'data' for command '%s'" % name,
expr.get('data'), allow_dict=not boxed, allow_optional=True,
allow_metas=args_meta)
returns_meta = ['union', 'struct']
if name in returns_whitelist:
returns_meta += ['built-in', 'alternate', 'enum']
check_type(info, "'returns' for command '%s'" % name,
expr.get('returns'), allow_array=True,
allow_optional=True, allow_metas=returns_meta)
def check_event(expr, info):
name = expr['event']
boxed = expr.get('boxed', False)
meta = ['struct']
if boxed:
meta += ['union', 'alternate']
check_type(info, "'data' for event '%s'" % name,
expr.get('data'), allow_dict=not boxed, allow_optional=True,
allow_metas=meta)
def check_union(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 QAPISemError(info, "Simple union '%s' must not have a base" %
name)
# Else, it's a flat union.
else:
# The object must have a string or dictionary 'base'.
check_type(info, "'base' for union '%s'" % name,
base, allow_dict=True, allow_optional=True,
allow_metas=['struct'])
if not base:
raise QAPISemError(info, "Flat union '%s' must have a base"
% name)
base_members = find_base_members(base)
assert base_members is not None
# The value of member 'discriminator' must name a non-optional
# member of the base struct.
check_name(info, "Discriminator of flat union '%s'" % name,
discriminator)
discriminator_type = base_members.get(discriminator)
if not discriminator_type:
raise QAPISemError(info,
"Discriminator '%s' is not a member of base "
"struct '%s'"
% (discriminator, base))
enum_define = enum_types.get(discriminator_type)
allow_metas = ['struct']
# Do not allow string discriminator
if not enum_define:
raise QAPISemError(info,
"Discriminator '%s' must be of enumeration "
"type" % discriminator)
# Check every branch; don't allow an empty union
if len(members) == 0:
raise QAPISemError(info, "Union '%s' cannot have empty 'data'" % name)
for (key, value) in members.items():
check_name(info, "Member of union '%s'" % name, key)
# Each value must name a known type
check_type(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['data']:
raise QAPISemError(info,
"Discriminator value '%s' is not found in "
"enum '%s'"
% (key, enum_define['enum']))
# If discriminator is user-defined, ensure all values are covered
if enum_define:
for value in enum_define['data']:
if value not in members.keys():
raise QAPISemError(info, "Union '%s' data missing '%s' branch"
% (name, value))
def check_alternate(expr, info):
name = expr['alternate']
members = expr['data']
types_seen = {}
# Check every branch; require at least two branches
if len(members) < 2:
raise QAPISemError(info,
"Alternate '%s' should have at least two branches "
"in 'data'" % name)
for (key, value) in members.items():
check_name(info, "Member of alternate '%s'" % name, key)
# Ensure alternates have no type conflicts.
check_type(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 QAPISemError(info, "Alternate '%s' member '%s' cannot use "
"type '%s'" % (name, key, value))
conflicting = set([qtype])
if qtype == 'QTYPE_QSTRING':
enum_expr = enum_types.get(value)
if enum_expr:
for v in enum_expr['data']:
if v in ['on', 'off']:
conflicting.add('QTYPE_QBOOL')
if re.match(r'[-+0-9.]', v): # lazy, could be tightened
conflicting.add('QTYPE_QINT')
conflicting.add('QTYPE_QFLOAT')
else:
conflicting.add('QTYPE_QINT')
conflicting.add('QTYPE_QFLOAT')
conflicting.add('QTYPE_QBOOL')
if conflicting & set(types_seen):
raise QAPISemError(info, "Alternate '%s' member '%s' can't "
"be distinguished from member '%s'"
% (name, key, types_seen[qtype]))
for qt in conflicting:
types_seen[qt] = key
def check_enum(expr, info):
name = expr['enum']
members = expr.get('data')
prefix = expr.get('prefix')
if not isinstance(members, list):
raise QAPISemError(info,
"Enum '%s' requires an array for 'data'" % name)
if prefix is not None and not isinstance(prefix, str):
raise QAPISemError(info,
"Enum '%s' requires a string for 'prefix'" % name)
for member in members:
check_name(info, "Member of enum '%s'" % name, member,
enum_member=True)
def check_struct(expr, info):
name = expr['struct']
members = expr['data']
check_type(info, "'data' for struct '%s'" % name, members,
allow_dict=True, allow_optional=True)
check_type(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 QAPISemError(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 QAPISemError(info, "Unknown key '%s' in %s '%s'"
% (key, meta, name))
if (key == 'gen' or key == 'success-response') and value is not False:
raise QAPISemError(info,
"'%s' of %s '%s' should only use false value"
% (key, meta, name))
if key == 'boxed' and value is not True:
raise QAPISemError(info,
"'%s' of %s '%s' should only use true value"
% (key, meta, name))
for key in required:
if key not in expr:
raise QAPISemError(info, "Key '%s' is missing from %s '%s'"
% (key, meta, name))
def check_exprs(exprs):
global all_names
# Populate name table with names of built-in types
for builtin in builtin_types.keys():
all_names[builtin] = 'built-in'
# Learn the types and check for valid expression keys
for expr_elem in exprs:
expr = expr_elem['expr']
info = expr_elem['info']
doc = expr_elem.get('doc')
if not doc and doc_required:
raise QAPISemError(info,
"Expression missing documentation comment")
if 'enum' in expr:
meta = 'enum'
check_keys(expr_elem, 'enum', ['data'], ['prefix'])
enum_types[expr[meta]] = expr
elif 'union' in expr:
meta = 'union'
check_keys(expr_elem, 'union', ['data'],
['base', 'discriminator'])
union_types[expr[meta]] = expr
elif 'alternate' in expr:
meta = 'alternate'
check_keys(expr_elem, 'alternate', ['data'])
elif 'struct' in expr:
meta = 'struct'
check_keys(expr_elem, 'struct', ['data'], ['base'])
struct_types[expr[meta]] = expr
elif 'command' in expr:
meta = 'command'
check_keys(expr_elem, 'command', [],
['data', 'returns', 'gen', 'success-response', 'boxed'])
elif 'event' in expr:
meta = 'event'
check_keys(expr_elem, 'event', [], ['data', 'boxed'])
else:
raise QAPISemError(expr_elem['info'],
"Expression is missing metatype")
name = expr[meta]
add_name(name, info, meta)
if doc and doc.symbol != name:
raise QAPISemError(info, "Definition of '%s' follows documentation"
" for '%s'" % (name, doc.symbol))
# Try again for hidden UnionKind enum
for expr_elem in exprs:
expr = expr_elem['expr']
if 'union' in expr and not discriminator_find_enum_define(expr):
name = '%sKind' % expr['union']
elif 'alternate' in expr:
name = '%sKind' % expr['alternate']
else:
continue
enum_types[name] = {'enum': name}
add_name(name, info, 'enum', implicit=True)
# Validate that exprs make sense
for expr_elem in exprs:
expr = expr_elem['expr']
info = expr_elem['info']
doc = expr_elem.get('doc')
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'
if doc:
doc.check_expr(expr)
return exprs
#
# Schema compiler frontend
#
class QAPISchemaEntity(object):
def __init__(self, name, info, doc):
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
self.doc = doc
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, boxed):
pass
def visit_event(self, name, info, arg_type, boxed):
pass
class QAPISchemaType(QAPISchemaEntity):
# Return the C type for common use.
# For the types we commonly box, this is a pointer type.
def c_type(self):
pass
# Return the C type to be used in a parameter list.
def c_param_type(self):
return self.c_type()
# Return the C type to be used where we suppress boxing.
def c_unboxed_type(self):
return self.c_type()
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())
def doc_type(self):
if self.is_implicit():
return None
return self.name
class QAPISchemaBuiltinType(QAPISchemaType):
def __init__(self, name, json_type, c_type):
QAPISchemaType.__init__(self, name, None, 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
def c_name(self):
return self.name
def c_type(self):
return self._c_type_name
def c_param_type(self):
if self.name == 'str':
return 'const ' + self._c_type_name
return self._c_type_name
def json_type(self):
return self._json_type_name
def doc_type(self):
return self.json_type()
def visit(self, visitor):
visitor.visit_builtin_type(self.name, self.info, self.json_type())
class QAPISchemaEnumType(QAPISchemaType):
def __init__(self, name, info, doc, values, prefix):
QAPISchemaType.__init__(self, name, info, doc)
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)
if self.doc:
self.doc.connect_member(v)
def is_implicit(self):
# See QAPISchema._make_implicit_enum_type() and ._def_predefineds()
return self.name.endswith('Kind') or self.name == 'QType'
def c_type(self):
return c_name(self.name)
def member_names(self):
return [v.name for v in self.values]
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, None)
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 c_type(self):
return c_name(self.name) + pointer_suffix
def json_type(self):
return 'array'
def doc_type(self):
elt_doc_type = self.element_type.doc_type()
if not elt_doc_type:
return None
return 'array of ' + elt_doc_type
def visit(self, visitor):
visitor.visit_array_type(self.name, self.info, self.element_type)
class QAPISchemaObjectType(QAPISchemaType):
def __init__(self, name, info, doc, 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, doc)
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 QAPISemError(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(self.info, seen)
for m in self.local_members:
m.check(schema)
m.check_clash(self.info, seen)
if self.doc:
self.doc.connect_member(m)
self.members = seen.values()
if self.variants:
self.variants.check(schema, seen)
assert self.variants.tag_member in self.members
self.variants.check_clash(self.info, seen)
if self.doc:
self.doc.check()
# Check that the members of this type do not cause duplicate JSON members,
# 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, 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(), as well as
# _def_predefineds()
return self.name.startswith('q_')
def is_empty(self):
assert self.members is not None
return not self.members and not self.variants
def c_name(self):
assert self.name != 'q_empty'
return QAPISchemaType.c_name(self)
def c_type(self):
assert not self.is_implicit()
return c_name(self.name) + pointer_suffix
def c_unboxed_type(self):
return c_name(self.name)
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 name_case_whitelist:
raise QAPISemError(info,
"%s should not use uppercase" % self.describe())
if cname in seen:
raise QAPISemError(info, "%s collides with %s" %
(self.describe(), seen[cname].describe()))
seen[cname] = self
def _pretty_owner(self):
owner = self.owner
if owner.startswith('q_obj_'):
# See QAPISchema._make_implicit_object_type() - reverse the
# mapping there to create a nice human-readable description
owner = owner[6:]
if owner.endswith('-arg'):
return '(parameter of %s)' % owner[:-4]
elif owner.endswith('-base'):
return '(base of %s)' % owner[:-5]
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, 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(info, dict(seen))
class QAPISchemaObjectTypeVariant(QAPISchemaObjectTypeMember):
role = 'branch'
def __init__(self, name, typ):
QAPISchemaObjectTypeMember.__init__(self, name, typ, False)
class QAPISchemaAlternateType(QAPISchemaType):
def __init__(self, name, info, doc, variants):
QAPISchemaType.__init__(self, name, info, doc)
assert isinstance(variants, QAPISchemaObjectTypeVariants)
assert variants.tag_member
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)
if self.doc:
self.doc.connect_member(v)
if self.doc:
self.doc.check()
def c_type(self):
return c_name(self.name) + pointer_suffix
def json_type(self):
return 'value'
def visit(self, visitor):
visitor.visit_alternate_type(self.name, self.info, self.variants)
def is_empty(self):
return False
class QAPISchemaCommand(QAPISchemaEntity):
def __init__(self, name, info, doc, arg_type, ret_type,
gen, success_response, boxed):
QAPISchemaEntity.__init__(self, name, info, doc)
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
self.boxed = boxed
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) or
isinstance(self.arg_type, QAPISchemaAlternateType))
self.arg_type.check(schema)
if self.boxed:
if self.arg_type.is_empty():
raise QAPISemError(self.info,
"Cannot use 'boxed' with empty type")
else:
assert not isinstance(self.arg_type, QAPISchemaAlternateType)
assert not self.arg_type.variants
elif self.boxed:
raise QAPISemError(self.info, "Use of 'boxed' requires 'data'")
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, self.boxed)
class QAPISchemaEvent(QAPISchemaEntity):
def __init__(self, name, info, doc, arg_type, boxed):
QAPISchemaEntity.__init__(self, name, info, doc)
assert not arg_type or isinstance(arg_type, str)
self._arg_type_name = arg_type
self.arg_type = None
self.boxed = boxed
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) or
isinstance(self.arg_type, QAPISchemaAlternateType))
self.arg_type.check(schema)
if self.boxed:
if self.arg_type.is_empty():
raise QAPISemError(self.info,
"Cannot use 'boxed' with empty type")
else:
assert not isinstance(self.arg_type, QAPISchemaAlternateType)
assert not self.arg_type.variants
elif self.boxed:
raise QAPISemError(self.info, "Use of 'boxed' requires 'data'")
def visit(self, visitor):
visitor.visit_event(self.name, self.info, self.arg_type, self.boxed)
class QAPISchema(object):
def __init__(self, fname):
try:
parser = QAPISchemaParser(open(fname, 'r'))
self.exprs = check_exprs(parser.exprs)
self.docs = parser.docs
self._entity_dict = {}
self._predefining = True
self._def_predefineds()
self._predefining = False
self._def_exprs()
self.check()
except QAPIError 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):
self._def_entity(QAPISchemaBuiltinType(name, json_type, c_type))
# 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),
('number', 'number', 'double'),
('int', 'int', 'int64_t'),
('int8', 'int', 'int8_t'),
('int16', 'int', 'int16_t'),
('int32', 'int', 'int32_t'),
('int64', 'int', 'int64_t'),
('uint8', 'int', 'uint8_t'),
('uint16', 'int', 'uint16_t'),
('uint32', 'int', 'uint32_t'),
('uint64', 'int', 'uint64_t'),
('size', 'int', 'uint64_t'),
('bool', 'boolean', 'bool'),
('any', 'value', 'QObject' + pointer_suffix)]:
self._def_builtin_type(*t)
self.the_empty_object_type = QAPISchemaObjectType(
'q_empty', None, 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, 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, None, 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, doc, role, members):
if not members:
return None
# See also QAPISchemaObjectTypeMember._pretty_owner()
name = 'q_obj_%s-%s' % (name, role)
if not self.lookup_entity(name, QAPISchemaObjectType):
self._def_entity(QAPISchemaObjectType(name, info, doc, None,
members, None))
return name
def _def_enum_type(self, expr, info, doc):
name = expr['enum']
data = expr['data']
prefix = expr.get('prefix')
self._def_entity(QAPISchemaEnumType(
name, info, doc, 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, doc):
name = expr['struct']
base = expr.get('base')
data = expr['data']
self._def_entity(QAPISchemaObjectType(name, info, doc, 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, None, 'wrapper', [self._make_member('data', typ, info)])
return QAPISchemaObjectTypeVariant(case, typ)
def _def_union_type(self, expr, info, doc):
name = expr['union']
data = expr['data']
base = expr.get('base')
tag_name = expr.get('discriminator')
tag_member = None
if isinstance(base, dict):
base = (self._make_implicit_object_type(
name, info, doc, 'base', self._make_members(base, info)))
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, doc, base, members,
QAPISchemaObjectTypeVariants(tag_name,
tag_member,
variants)))
def _def_alternate_type(self, expr, info, doc):
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, doc,
QAPISchemaObjectTypeVariants(None,
tag_member,
variants)))
def _def_command(self, expr, info, doc):
name = expr['command']
data = expr.get('data')
rets = expr.get('returns')
gen = expr.get('gen', True)
success_response = expr.get('success-response', True)
boxed = expr.get('boxed', False)
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
name, info, doc, '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, doc, data, rets,
gen, success_response, boxed))
def _def_event(self, expr, info, doc):
name = expr['event']
data = expr.get('data')
boxed = expr.get('boxed', False)
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
name, info, doc, 'arg', self._make_members(data, info))
self._def_entity(QAPISchemaEvent(name, info, doc, data, boxed))
def _def_exprs(self):
for expr_elem in self.exprs:
expr = expr_elem['expr']
info = expr_elem['info']
doc = expr_elem.get('doc')
if 'enum' in expr:
self._def_enum_type(expr, info, doc)
elif 'struct' in expr:
self._def_struct_type(expr, info, doc)
elif 'union' in expr:
self._def_union_type(expr, info, doc)
elif 'alternate' in expr:
self._def_alternate_type(expr, info, doc)
elif 'command' in expr:
self._def_command(expr, info, doc)
elif 'event' in expr:
self._def_event(expr, info, doc)
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(r'^.', re.MULTILINE),
indent + r'\g<0>', raw)
raw = raw[0]
return re.sub(re.escape(eatspace) + r' *', '', 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, boxed, extra):
if not arg_type:
assert not boxed
return extra
ret = ''
sep = ''
if boxed:
ret += '%s arg' % arg_type.c_param_type()
sep = ', '
else:
assert not arg_type.variants
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_param_type(),
c_name(memb.name))
if extra:
ret += sep + extra
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(r'([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()
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