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qemu-e2k/scripts/qapi/common.py

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#
# QAPI helper library
#
# Copyright IBM, Corp. 2011
# Copyright (c) 2013-2018 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.
from __future__ import print_function
from contextlib import contextmanager
import copy
import errno
import os
import re
import string
import sys
from collections import OrderedDict
# 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 = []
#
# Parsing the schema into expressions
#
class QAPISourceInfo(object):
def __init__(self, fname, line, parent):
self.fname = fname
self.line = line
self.parent = parent
self.defn_meta = None
self.defn_name = None
def set_defn(self, meta, name):
self.defn_meta = meta
self.defn_name = name
def next_line(self):
info = copy.copy(self)
info.line += 1
return info
def loc(self):
if self.fname is None:
return sys.argv[0]
ret = self.fname
if self.line is not None:
ret += ':%d' % self.line
return ret
def in_defn(self):
if self.defn_name:
return "%s: In %s '%s':\n" % (self.fname,
self.defn_meta, self.defn_name)
return ''
def include_path(self):
ret = ''
parent = self.parent
while parent:
ret = 'In file included from %s:\n' % parent.loc() + ret
parent = parent.parent
return ret
def __str__(self):
return self.include_path() + self.in_defn() + self.loc()
class QAPIError(Exception):
def __init__(self, info, col, msg):
Exception.__init__(self)
self.info = info
self.col = col
self.msg = msg
def __str__(self):
loc = str(self.info)
if self.col is not None:
assert self.info.line is not None
loc += ':%s' % self.col
return 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.info, col, msg)
class QAPISemError(QAPIError):
def __init__(self, info, msg):
QAPIError.__init__(self, info, None, msg)
class QAPIDoc(object):
"""
A documentation comment block, either definition or free-form
Definition documentation blocks consist of
* a body section: one line naming the definition, followed by an
overview (any number of lines)
* argument sections: a description of each argument (for commands
and events) or member (for structs, unions and alternates)
* features sections: a description of each feature flag
* additional (non-argument) sections, possibly tagged
Free-form documentation blocks consist only of a body section.
"""
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.text = ''
def append(self, line):
self.text += line.rstrip() + '\n'
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()
self.features = OrderedDict()
# a list of Section
self.sections = []
# the current section
self._section = self.body
self._append_line = self._append_body_line
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.
The way that the line is dealt with depends on which part of
the documentation we're parsing right now:
* The body section: ._append_line is ._append_body_line
* An argument section: ._append_line is ._append_args_line
* A features section: ._append_line is ._append_features_line
* An additional section: ._append_line is ._append_various_line
"""
line = line[1:]
if not line:
self._append_freeform(line)
return
if line[0] != ' ':
raise QAPIParseError(self._parser, "missing space after #")
line = line[1:]
self._append_line(line)
def end_comment(self):
self._end_section()
@staticmethod
def _is_section_tag(name):
return name in ('Returns:', 'Since:',
# those are often singular or plural
'Note:', 'Notes:',
'Example:', 'Examples:',
'TODO:')
def _append_body_line(self, line):
"""
Process a line of documentation text in the body section.
If this a symbol line and it is the section's first line, this
is a definition documentation block for that symbol.
If it's a definition documentation block, another symbol line
begins the argument section for the argument named by it, and
a section tag begins an additional section. Start that
section and append the line to it.
Else, append the line to the current section.
"""
name = line.split(' ', 1)[0]
# FIXME not nice: things like '# @foo:' and '# @foo: ' aren't
# recognized, and get silently treated as ordinary text
if not self.symbol and not self.body.text 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")
elif self.symbol:
# This is a definition documentation block
if name.startswith('@') and name.endswith(':'):
self._append_line = self._append_args_line
self._append_args_line(line)
elif line == 'Features:':
self._append_line = self._append_features_line
elif self._is_section_tag(name):
self._append_line = self._append_various_line
self._append_various_line(line)
else:
self._append_freeform(line.strip())
else:
# This is a free-form documentation block
self._append_freeform(line.strip())
def _append_args_line(self, line):
"""
Process a line of documentation text in an argument section.
A symbol line begins the next argument section, a section tag
section or a non-indented line after a blank line begins an
additional section. Start that section and append the line to
it.
Else, append the line to the current section.
"""
name = line.split(' ', 1)[0]
if name.startswith('@') and name.endswith(':'):
line = line[len(name)+1:]
self._start_args_section(name[1:-1])
elif self._is_section_tag(name):
self._append_line = self._append_various_line
self._append_various_line(line)
return
elif (self._section.text.endswith('\n\n')
and line and not line[0].isspace()):
if line == 'Features:':
self._append_line = self._append_features_line
else:
self._start_section()
self._append_line = self._append_various_line
self._append_various_line(line)
return
self._append_freeform(line.strip())
def _append_features_line(self, line):
name = line.split(' ', 1)[0]
if name.startswith('@') and name.endswith(':'):
line = line[len(name)+1:]
self._start_features_section(name[1:-1])
elif self._is_section_tag(name):
self._append_line = self._append_various_line
self._append_various_line(line)
return
elif (self._section.text.endswith('\n\n')
and line and not line[0].isspace()):
self._start_section()
self._append_line = self._append_various_line
self._append_various_line(line)
return
self._append_freeform(line.strip())
def _append_various_line(self, line):
"""
Process a line of documentation text in an additional section.
A symbol line is an error.
A section tag begins an additional section. Start that
section and append the line to it.
Else, append the line to the current section.
"""
name = line.split(' ', 1)[0]
if name.startswith('@') and name.endswith(':'):
raise QAPIParseError(self._parser,
"'%s' can't follow '%s' section"
% (name, self.sections[0].name))
elif self._is_section_tag(name):
line = line[len(name)+1:]
self._start_section(name[:-1])
if (not self._section.name or
not self._section.name.startswith('Example')):
line = line.strip()
self._append_freeform(line)
def _start_symbol_section(self, symbols_dict, 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 symbols_dict:
raise QAPIParseError(self._parser,
"'%s' parameter name duplicated" % name)
assert not self.sections
self._end_section()
self._section = QAPIDoc.ArgSection(name)
symbols_dict[name] = self._section
def _start_args_section(self, name):
self._start_symbol_section(self.args, name)
def _start_features_section(self, name):
self._start_symbol_section(self.features, name)
def _start_section(self, name=None):
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:
text = self._section.text = self._section.text.strip()
if self._section.name and (not text or text.isspace()):
raise QAPIParseError(
self._parser,
"empty doc section '%s'" % self._section.name)
self._section = None
def _append_freeform(self, line):
match = re.match(r'(@\S+:)', line)
if match:
raise QAPIParseError(self._parser,
"'%s' not allowed in free-form documentation"
% match.group(1))
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.items()
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, fname, previously_included=[], incl_info=None):
previously_included.append(os.path.abspath(fname))
try:
if sys.version_info[0] >= 3:
fp = open(fname, 'r', encoding='utf-8')
else:
fp = open(fname, 'r')
self.src = fp.read()
except IOError as e:
raise QAPISemError(incl_info or QAPISourceInfo(None, None, None),
"can't read %s file '%s': %s"
% ("include" if incl_info else "schema",
fname,
e.strerror))
if self.src == '' or self.src[-1] != '\n':
self.src += '\n'
self.cursor = 0
self.info = QAPISourceInfo(fname, 1, incl_info)
self.line_pos = 0
self.exprs = []
self.docs = []
self.accept()
cur_doc = None
while self.tok is not None:
info = self.info
if self.tok == '#':
self.reject_expr_doc(cur_doc)
cur_doc = self.get_doc(info)
self.docs.append(cur_doc)
continue
expr = self.get_expr(False)
if 'include' in expr:
self.reject_expr_doc(cur_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")
incl_fname = os.path.join(os.path.dirname(fname),
include)
self.exprs.append({'expr': {'include': incl_fname},
'info': info})
exprs_include = self._include(include, info, incl_fname,
previously_included)
if exprs_include:
self.exprs.extend(exprs_include.exprs)
self.docs.extend(exprs_include.docs)
elif "pragma" in expr:
self.reject_expr_doc(cur_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 an object")
for name, value in pragma.items():
self._pragma(name, value, info)
else:
expr_elem = {'expr': expr,
'info': info}
if cur_doc:
if not cur_doc.symbol:
raise QAPISemError(
cur_doc.info, "definition documentation required")
expr_elem['doc'] = cur_doc
self.exprs.append(expr_elem)
cur_doc = None
self.reject_expr_doc(cur_doc)
@staticmethod
def reject_expr_doc(doc):
if doc and doc.symbol:
raise QAPISemError(
doc.info,
"documentation for '%s' is not followed by the definition"
% doc.symbol)
def _include(self, include, info, incl_fname, previously_included):
incl_abs_fname = os.path.abspath(incl_fname)
# catch inclusion cycle
inf = info
while inf:
if incl_abs_fname == os.path.abspath(inf.fname):
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 None
return QAPISchemaParser(incl_fname, previously_included, info)
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 == "'":
# Note: we accept only printable ASCII
string = ''
esc = False
while True:
ch = self.src[self.cursor]
self.cursor += 1
if ch == '\n':
raise QAPIParseError(self, "missing terminating \"'\"")
if esc:
# Note: we recognize only \\ because we have
# no use for funny characters in strings
if ch != '\\':
raise QAPIParseError(self,
"unknown escape \\%s" % ch)
esc = False
elif ch == '\\':
esc = True
continue
elif ch == "'":
self.val = string
return
if ord(ch) < 32 or ord(ch) >= 127:
raise QAPIParseError(
self, "funny character in string")
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.tok == '\n':
if self.cursor == len(self.src):
self.tok = None
return
self.info = self.info.next_line()
self.line_pos = self.cursor
elif not self.tok.isspace():
# Show up to next structural, whitespace or quote
# character
match = re.match('[^[\\]{}:,\\s\'"]+',
self.src[self.cursor-1:])
raise QAPIParseError(self, "stray '%s'" % match.group(0))
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 '##'")
#
# Check (context-free) schema expression structure
#
# 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_is_str(name, info, source):
if not isinstance(name, str):
raise QAPISemError(info, "%s requires a string name" % source)
def check_name_str(name, info, source,
allow_optional=False, enum_member=False,
permit_upper=False):
global valid_name
membername = name
if allow_optional and name.startswith('*'):
membername = name[1:]
# 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 has an invalid name" % source)
if not permit_upper and name.lower() != name:
raise QAPISemError(
info, "%s uses uppercase in name" % source)
assert not membername.startswith('*')
def check_defn_name_str(name, info, meta):
check_name_str(name, info, meta, permit_upper=True)
if name.endswith('Kind') or name.endswith('List'):
raise QAPISemError(
info, "%s name should not end in '%s'" % (meta, name[-4:]))
def check_if(expr, info, source):
def check_if_str(ifcond, info):
if not isinstance(ifcond, str):
raise QAPISemError(
info,
"'if' condition of %s must be a string or a list of strings"
% source)
if ifcond.strip() == '':
raise QAPISemError(
info,
"'if' condition '%s' of %s makes no sense"
% (ifcond, source))
ifcond = expr.get('if')
if ifcond is None:
return
if isinstance(ifcond, list):
if ifcond == []:
raise QAPISemError(
info, "'if' condition [] of %s is useless" % source)
for elt in ifcond:
check_if_str(elt, info)
else:
check_if_str(ifcond, info)
def check_type(value, info, source,
allow_array=False, allow_dict=False):
if value is None:
return
# Array type
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)
return
# Type name
if isinstance(value, str):
return
# Anonymous type
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 an object or type name" % source)
permit_upper = allow_dict in name_case_whitelist
# value is a dictionary, check that each member is okay
for (key, arg) in value.items():
key_source = "%s member '%s'" % (source, key)
check_name_str(key, info, key_source,
allow_optional=True, permit_upper=permit_upper)
if c_name(key, False) == 'u' or c_name(key, False).startswith('has_'):
raise QAPISemError(info, "%s uses reserved name" % key_source)
check_keys(arg, info, key_source, ['type'], ['if'])
check_if(arg, info, key_source)
normalize_if(arg)
check_type(arg['type'], info, key_source, allow_array=True)
def check_command(expr, info):
args = expr.get('data')
rets = expr.get('returns')
boxed = expr.get('boxed', False)
if boxed and args is None:
raise QAPISemError(info, "'boxed': true requires 'data'")
check_type(args, info, "'data'", allow_dict=not boxed)
check_type(rets, info, "'returns'", allow_array=True)
def check_event(expr, info):
args = expr.get('data')
boxed = expr.get('boxed', False)
if boxed and args is None:
raise QAPISemError(info, "'boxed': true requires 'data'")
check_type(args, info, "'data'", allow_dict=not boxed)
def check_union(expr, info):
name = expr['union']
base = expr.get('base')
discriminator = expr.get('discriminator')
members = expr['data']
if discriminator is None: # simple union
if base is not None:
raise QAPISemError(info, "'base' requires 'discriminator'")
else: # flat union
check_type(base, info, "'base'", allow_dict=name)
if not base:
raise QAPISemError(info, "'discriminator' requires 'base'")
check_name_is_str(discriminator, info, "'discriminator'")
for (key, value) in members.items():
source = "'data' member '%s'" % key
check_name_str(key, info, source)
check_keys(value, info, source, ['type'], ['if'])
check_if(value, info, source)
normalize_if(value)
check_type(value['type'], info, source, allow_array=not base)
def check_alternate(expr, info):
members = expr['data']
if len(members) == 0:
raise QAPISemError(info, "'data' must not be empty")
for (key, value) in members.items():
source = "'data' member '%s'" % key
check_name_str(key, info, source)
check_keys(value, info, source, ['type'], ['if'])
check_if(value, info, source)
normalize_if(value)
check_type(value['type'], info, source)
def check_enum(expr, info):
name = expr['enum']
members = expr['data']
prefix = expr.get('prefix')
if not isinstance(members, list):
raise QAPISemError(info, "'data' must be an array")
if prefix is not None and not isinstance(prefix, str):
raise QAPISemError(info, "'prefix' must be a string")
permit_upper = name in name_case_whitelist
for member in members:
source = "'data' member"
check_keys(member, info, source, ['name'], ['if'])
check_name_is_str(member['name'], info, source)
source = "%s '%s'" % (source, member['name'])
check_name_str(member['name'], info, source,
enum_member=True, permit_upper=permit_upper)
check_if(member, info, source)
normalize_if(member)
def check_struct(expr, info):
name = expr['struct']
members = expr['data']
features = expr.get('features')
check_type(members, info, "'data'", allow_dict=name)
check_type(expr.get('base'), info, "'base'")
if features:
if not isinstance(features, list):
raise QAPISemError(info, "'features' must be an array")
for f in features:
source = "'features' member"
assert isinstance(f, dict)
check_keys(f, info, source, ['name'], ['if'])
check_name_is_str(f['name'], info, source)
source = "%s '%s'" % (source, f['name'])
check_name_str(f['name'], info, source)
check_if(f, info, source)
normalize_if(f)
def check_keys(value, info, source, required, optional):
def pprint(elems):
return ', '.join("'" + e + "'" for e in sorted(elems))
missing = set(required) - set(value)
if missing:
raise QAPISemError(
info,
"%s misses key%s %s"
% (source, 's' if len(missing) > 1 else '',
pprint(missing)))
allowed = set(required + optional)
unknown = set(value) - allowed
if unknown:
raise QAPISemError(
info,
"%s has unknown key%s %s\nValid keys are %s."
% (source, 's' if len(unknown) > 1 else '',
pprint(unknown), pprint(allowed)))
def check_flags(expr, info):
for key in ['gen', 'success-response']:
if key in expr and expr[key] is not False:
raise QAPISemError(
info, "flag '%s' may only use false value" % key)
for key in ['boxed', 'allow-oob', 'allow-preconfig']:
if key in expr and expr[key] is not True:
raise QAPISemError(
info, "flag '%s' may only use true value" % key)
def normalize_enum(expr):
if isinstance(expr['data'], list):
expr['data'] = [m if isinstance(m, dict) else {'name': m}
for m in expr['data']]
def normalize_members(members):
if isinstance(members, OrderedDict):
for key, arg in members.items():
if isinstance(arg, dict):
continue
members[key] = {'type': arg}
def normalize_features(features):
if isinstance(features, list):
features[:] = [f if isinstance(f, dict) else {'name': f}
for f in features]
def normalize_if(expr):
ifcond = expr.get('if')
if isinstance(ifcond, str):
expr['if'] = [ifcond]
def check_exprs(exprs):
for expr_elem in exprs:
expr = expr_elem['expr']
info = expr_elem['info']
doc = expr_elem.get('doc')
if 'include' in expr:
continue
if 'enum' in expr:
meta = 'enum'
elif 'union' in expr:
meta = 'union'
elif 'alternate' in expr:
meta = 'alternate'
elif 'struct' in expr:
meta = 'struct'
elif 'command' in expr:
meta = 'command'
elif 'event' in expr:
meta = 'event'
else:
raise QAPISemError(info, "expression is missing metatype")
name = expr[meta]
check_name_is_str(name, info, "'%s'" % meta)
info.set_defn(meta, name)
check_defn_name_str(name, info, meta)
if doc:
if doc.symbol != name:
raise QAPISemError(
info, "documentation comment is for '%s'" % doc.symbol)
doc.check_expr(expr)
elif doc_required:
raise QAPISemError(info,
"documentation comment required")
if meta == 'enum':
check_keys(expr, info, meta,
['enum', 'data'], ['if', 'prefix'])
normalize_enum(expr)
check_enum(expr, info)
elif meta == 'union':
check_keys(expr, info, meta,
['union', 'data'],
['base', 'discriminator', 'if'])
normalize_members(expr.get('base'))
normalize_members(expr['data'])
check_union(expr, info)
elif meta == 'alternate':
check_keys(expr, info, meta,
['alternate', 'data'], ['if'])
normalize_members(expr['data'])
check_alternate(expr, info)
elif meta == 'struct':
check_keys(expr, info, meta,
['struct', 'data'], ['base', 'if', 'features'])
normalize_members(expr['data'])
normalize_features(expr.get('features'))
check_struct(expr, info)
elif meta == 'command':
check_keys(expr, info, meta,
['command'],
['data', 'returns', 'boxed', 'if',
'gen', 'success-response', 'allow-oob',
'allow-preconfig'])
normalize_members(expr.get('data'))
check_command(expr, info)
elif meta == 'event':
check_keys(expr, info, meta,
['event'], ['data', 'boxed', 'if'])
normalize_members(expr.get('data'))
check_event(expr, info)
else:
assert False, 'unexpected meta type'
normalize_if(expr)
check_if(expr, info, meta)
check_flags(expr, info)
return exprs
#
# Schema compiler frontend
# TODO catching name collisions in generated code would be nice
#
class QAPISchemaEntity(object):
meta = None
def __init__(self, name, info, doc, ifcond=None):
assert name is None or isinstance(name, str)
self.name = name
self._module = None
# 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
self._ifcond = ifcond or []
self._checked = False
def c_name(self):
return c_name(self.name)
def check(self, schema):
assert not self._checked
if self.info:
self._module = os.path.relpath(self.info.fname,
os.path.dirname(schema.fname))
self._checked = True
@property
def ifcond(self):
assert self._checked
return self._ifcond
@property
def module(self):
assert self._checked
return self._module
def is_implicit(self):
return not self.info
def visit(self, visitor):
assert self._checked
def describe(self):
assert self.meta
return "%s '%s'" % (self.meta, self.name)
class QAPISchemaVisitor(object):
def visit_begin(self, schema):
pass
def visit_end(self):
pass
def visit_module(self, fname):
pass
def visit_needed(self, entity):
# Default to visiting everything
return True
def visit_include(self, fname, info):
pass
def visit_builtin_type(self, name, info, json_type):
pass
def visit_enum_type(self, name, info, ifcond, members, prefix):
pass
def visit_array_type(self, name, info, ifcond, element_type):
pass
def visit_object_type(self, name, info, ifcond, base, members, variants,
features):
pass
def visit_object_type_flat(self, name, info, ifcond, members, variants,
features):
pass
def visit_alternate_type(self, name, info, ifcond, variants):
pass
def visit_command(self, name, info, ifcond, arg_type, ret_type, gen,
success_response, boxed, allow_oob, allow_preconfig):
pass
def visit_event(self, name, info, ifcond, arg_type, boxed):
pass
class QAPISchemaInclude(QAPISchemaEntity):
def __init__(self, fname, info):
QAPISchemaEntity.__init__(self, None, info, None)
self.fname = fname
def visit(self, visitor):
QAPISchemaEntity.visit(self, visitor)
visitor.visit_include(self.fname, self.info)
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 = {
'null': 'QTYPE_QNULL',
'string': 'QTYPE_QSTRING',
'number': 'QTYPE_QNUM',
'int': 'QTYPE_QNUM',
'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
def describe(self):
assert self.meta
return "%s type '%s'" % (self.meta, self.name)
class QAPISchemaBuiltinType(QAPISchemaType):
meta = 'built-in'
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):
QAPISchemaType.visit(self, visitor)
visitor.visit_builtin_type(self.name, self.info, self.json_type())
class QAPISchemaEnumType(QAPISchemaType):
meta = 'enum'
def __init__(self, name, info, doc, ifcond, members, prefix):
QAPISchemaType.__init__(self, name, info, doc, ifcond)
for m in members:
assert isinstance(m, QAPISchemaEnumMember)
m.set_defined_in(name)
assert prefix is None or isinstance(prefix, str)
self.members = members
self.prefix = prefix
def check(self, schema):
QAPISchemaType.check(self, schema)
seen = {}
for m in self.members:
m.check_clash(self.info, seen)
if self.doc:
self.doc.connect_member(m)
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 [m.name for m in self.members]
def json_type(self):
return 'string'
def visit(self, visitor):
QAPISchemaType.visit(self, visitor)
visitor.visit_enum_type(self.name, self.info, self.ifcond,
self.members, self.prefix)
class QAPISchemaArrayType(QAPISchemaType):
meta = 'array'
def __init__(self, name, info, element_type):
QAPISchemaType.__init__(self, name, info, None, None)
assert isinstance(element_type, str)
self._element_type_name = element_type
self.element_type = None
def check(self, schema):
QAPISchemaType.check(self, schema)
self.element_type = schema.resolve_type(
self._element_type_name, self.info,
self.info and self.info.defn_meta)
assert not isinstance(self.element_type, QAPISchemaArrayType)
@property
def ifcond(self):
assert self._checked
return self.element_type.ifcond
@property
def module(self):
assert self._checked
return self.element_type.module
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):
QAPISchemaType.visit(self, visitor)
visitor.visit_array_type(self.name, self.info, self.ifcond,
self.element_type)
def describe(self):
assert self.meta
return "%s type ['%s']" % (self.meta, self._element_type_name)
class QAPISchemaObjectType(QAPISchemaType):
def __init__(self, name, info, doc, ifcond,
base, local_members, variants, features):
# 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, ifcond)
self.meta = 'union' if variants else 'struct'
assert base is None or isinstance(base, str)
for m in local_members:
assert isinstance(m, QAPISchemaObjectTypeMember)
m.set_defined_in(name)
if variants is not None:
assert isinstance(variants, QAPISchemaObjectTypeVariants)
variants.set_defined_in(name)
for f in features:
assert isinstance(f, QAPISchemaFeature)
f.set_defined_in(name)
self._base_name = base
self.base = None
self.local_members = local_members
self.variants = variants
self.members = None
self.features = features
def check(self, schema):
# This calls another type T's .check() exactly when the C
# struct emitted by gen_object() contains that T's C struct
# (pointers don't count).
if self.members is not None:
# A previous .check() completed: nothing to do
return
if self._checked:
# Recursed: C struct contains itself
raise QAPISemError(self.info,
"object %s contains itself" % self.name)
QAPISchemaType.check(self, schema)
assert self._checked and self.members is None
seen = OrderedDict()
if self._base_name:
self.base = schema.resolve_type(self._base_name, self.info,
"'base'")
if (not isinstance(self.base, QAPISchemaObjectType)
or self.base.variants):
raise QAPISemError(
self.info,
"'base' requires a struct type, %s isn't"
% self.base.describe())
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)
members = seen.values()
if self.variants:
self.variants.check(schema, seen)
self.variants.check_clash(self.info, seen)
# Features are in a name space separate from members
seen = {}
for f in self.features:
f.check_clash(self.info, seen)
if self.doc:
self.doc.check()
self.members = members # mark completed
# 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 self._checked
assert not self.variants # not implemented
for m in self.members:
m.check_clash(info, seen)
@property
def ifcond(self):
assert self._checked
if isinstance(self._ifcond, QAPISchemaType):
# Simple union wrapper type inherits from wrapped type;
# see _make_implicit_object_type()
return self._ifcond.ifcond
return self._ifcond
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):
QAPISchemaType.visit(self, visitor)
visitor.visit_object_type(self.name, self.info, self.ifcond,
self.base, self.local_members, self.variants,
self.features)
visitor.visit_object_type_flat(self.name, self.info, self.ifcond,
self.members, self.variants,
self.features)
class QAPISchemaMember(object):
""" Represents object members, enum members and features """
role = 'member'
def __init__(self, name, info, ifcond=None):
assert isinstance(name, str)
self.name = name
self.info = info
self.ifcond = ifcond or []
self.defined_in = None
def set_defined_in(self, name):
assert not self.defined_in
self.defined_in = name
def check_clash(self, info, seen):
cname = c_name(self.name)
if cname in seen:
raise QAPISemError(
info,
"%s collides with %s"
% (self.describe(info), seen[cname].describe(info)))
seen[cname] = self
def describe(self, info):
role = self.role
defined_in = self.defined_in
assert defined_in
if defined_in.startswith('q_obj_'):
# See QAPISchema._make_implicit_object_type() - reverse the
# mapping there to create a nice human-readable description
defined_in = defined_in[6:]
if defined_in.endswith('-arg'):
# Implicit type created for a command's dict 'data'
assert role == 'member'
role = 'parameter'
elif defined_in.endswith('-base'):
# Implicit type created for a flat union's dict 'base'
role = 'base ' + role
else:
# Implicit type created for a simple union's branch
assert defined_in.endswith('-wrapper')
# Unreachable and not implemented
assert False
elif defined_in.endswith('Kind'):
# See QAPISchema._make_implicit_enum_type()
# Implicit enum created for simple union's branches
assert role == 'value'
role = 'branch'
elif defined_in != info.defn_name:
return "%s '%s' of type '%s'" % (role, self.name, defined_in)
return "%s '%s'" % (role, self.name)
class QAPISchemaEnumMember(QAPISchemaMember):
role = 'value'
class QAPISchemaFeature(QAPISchemaMember):
role = 'feature'
class QAPISchemaObjectTypeMember(QAPISchemaMember):
def __init__(self, name, info, typ, optional, ifcond=None):
QAPISchemaMember.__init__(self, name, info, ifcond)
assert isinstance(typ, str)
assert isinstance(optional, bool)
self._type_name = typ
self.type = None
self.optional = optional
def check(self, schema):
assert self.defined_in
self.type = schema.resolve_type(self._type_name, self.info,
self.describe)
class QAPISchemaObjectTypeVariants(object):
def __init__(self, tag_name, info, 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))
for v in variants:
assert isinstance(v, QAPISchemaObjectTypeVariant)
self._tag_name = tag_name
self.info = info
self.tag_member = tag_member
self.variants = variants
def set_defined_in(self, name):
for v in self.variants:
v.set_defined_in(name)
def check(self, schema, seen):
if not self.tag_member: # flat union
self.tag_member = seen.get(c_name(self._tag_name))
base = "'base'"
# Pointing to the base type when not implicit would be
# nice, but we don't know it here
if not self.tag_member or self._tag_name != self.tag_member.name:
raise QAPISemError(
self.info,
"discriminator '%s' is not a member of %s"
% (self._tag_name, base))
# Here we do:
base_type = schema.lookup_type(self.tag_member.defined_in)
assert base_type
if not base_type.is_implicit():
base = "base type '%s'" % self.tag_member.defined_in
if not isinstance(self.tag_member.type, QAPISchemaEnumType):
raise QAPISemError(
self.info,
"discriminator member '%s' of %s must be of enum type"
% (self._tag_name, base))
if self.tag_member.optional:
raise QAPISemError(
self.info,
"discriminator member '%s' of %s must not be optional"
% (self._tag_name, base))
if self.tag_member.ifcond:
raise QAPISemError(
self.info,
"discriminator member '%s' of %s must not be conditional"
% (self._tag_name, base))
else: # simple union
assert isinstance(self.tag_member.type, QAPISchemaEnumType)
assert not self.tag_member.optional
assert self.tag_member.ifcond == []
if self._tag_name: # flat union
# branches that are not explicitly covered get an empty type
cases = set([v.name for v in self.variants])
for m in self.tag_member.type.members:
if m.name not in cases:
v = QAPISchemaObjectTypeVariant(m.name, self.info,
'q_empty', m.ifcond)
v.set_defined_in(self.tag_member.defined_in)
self.variants.append(v)
if not self.variants:
raise QAPISemError(self.info, "union has no branches")
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:
if v.name not in self.tag_member.type.member_names():
raise QAPISemError(
self.info,
"branch '%s' is not a value of %s"
% (v.name, self.tag_member.type.describe()))
if (not isinstance(v.type, QAPISchemaObjectType)
or v.type.variants):
raise QAPISemError(
self.info,
"%s cannot use %s"
% (v.describe(self.info), v.type.describe()))
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
v.type.check_clash(info, dict(seen))
class QAPISchemaObjectTypeVariant(QAPISchemaObjectTypeMember):
role = 'branch'
def __init__(self, name, info, typ, ifcond=None):
QAPISchemaObjectTypeMember.__init__(self, name, info, typ,
False, ifcond)
class QAPISchemaAlternateType(QAPISchemaType):
meta = 'alternate'
def __init__(self, name, info, doc, ifcond, variants):
QAPISchemaType.__init__(self, name, info, doc, ifcond)
assert isinstance(variants, QAPISchemaObjectTypeVariants)
assert variants.tag_member
variants.set_defined_in(name)
variants.tag_member.set_defined_in(self.name)
self.variants = variants
def check(self, schema):
QAPISchemaType.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 = {}
types_seen = {}
for v in self.variants.variants:
v.check_clash(self.info, seen)
qtype = v.type.alternate_qtype()
if not qtype:
raise QAPISemError(
self.info,
"%s cannot use %s"
% (v.describe(self.info), v.type.describe()))
conflicting = set([qtype])
if qtype == 'QTYPE_QSTRING':
if isinstance(v.type, QAPISchemaEnumType):
for m in v.type.members:
if m.name in ['on', 'off']:
conflicting.add('QTYPE_QBOOL')
if re.match(r'[-+0-9.]', m.name):
# lazy, could be tightened
conflicting.add('QTYPE_QNUM')
else:
conflicting.add('QTYPE_QNUM')
conflicting.add('QTYPE_QBOOL')
for qt in conflicting:
if qt in types_seen:
raise QAPISemError(
self.info,
"%s can't be distinguished from '%s'"
% (v.describe(self.info), types_seen[qt]))
types_seen[qt] = v.name
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):
QAPISchemaType.visit(self, visitor)
visitor.visit_alternate_type(self.name, self.info, self.ifcond,
self.variants)
class QAPISchemaCommand(QAPISchemaEntity):
meta = 'command'
def __init__(self, name, info, doc, ifcond, arg_type, ret_type,
gen, success_response, boxed, allow_oob, allow_preconfig):
QAPISchemaEntity.__init__(self, name, info, doc, ifcond)
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
self.allow_oob = allow_oob
self.allow_preconfig = allow_preconfig
def check(self, schema):
QAPISchemaEntity.check(self, schema)
if self._arg_type_name:
self.arg_type = schema.resolve_type(
self._arg_type_name, self.info, "command's 'data'")
if not isinstance(self.arg_type, QAPISchemaObjectType):
raise QAPISemError(
self.info,
"command's 'data' cannot take %s"
% self.arg_type.describe())
if self.arg_type.variants and not self.boxed:
raise QAPISemError(
self.info,
"command's 'data' can take %s only with 'boxed': true"
% self.arg_type.describe())
if self._ret_type_name:
self.ret_type = schema.resolve_type(
self._ret_type_name, self.info, "command's 'returns'")
if self.name not in returns_whitelist:
if not (isinstance(self.ret_type, QAPISchemaObjectType)
or (isinstance(self.ret_type, QAPISchemaArrayType)
and isinstance(self.ret_type.element_type,
QAPISchemaObjectType))):
raise QAPISemError(
self.info,
"command's 'returns' cannot take %s"
% self.ret_type.describe())
def visit(self, visitor):
QAPISchemaEntity.visit(self, visitor)
visitor.visit_command(self.name, self.info, self.ifcond,
self.arg_type, self.ret_type,
self.gen, self.success_response,
self.boxed, self.allow_oob,
self.allow_preconfig)
class QAPISchemaEvent(QAPISchemaEntity):
meta = 'event'
def __init__(self, name, info, doc, ifcond, arg_type, boxed):
QAPISchemaEntity.__init__(self, name, info, doc, ifcond)
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):
QAPISchemaEntity.check(self, schema)
if self._arg_type_name:
self.arg_type = schema.resolve_type(
self._arg_type_name, self.info, "event's 'data'")
if not isinstance(self.arg_type, QAPISchemaObjectType):
raise QAPISemError(
self.info,
"event's 'data' cannot take %s"
% self.arg_type.describe())
if self.arg_type.variants and not self.boxed:
raise QAPISemError(
self.info,
"event's 'data' can take %s only with 'boxed': true"
% self.arg_type.describe())
def visit(self, visitor):
QAPISchemaEntity.visit(self, visitor)
visitor.visit_event(self.name, self.info, self.ifcond,
self.arg_type, self.boxed)
class QAPISchema(object):
def __init__(self, fname):
self.fname = fname
parser = QAPISchemaParser(fname)
exprs = check_exprs(parser.exprs)
self.docs = parser.docs
self._entity_list = []
self._entity_dict = {}
self._predefining = True
self._def_predefineds()
self._predefining = False
self._def_exprs(exprs)
self.check()
def _def_entity(self, ent):
# Only the predefined types are allowed to not have info
assert ent.info or self._predefining
self._entity_list.append(ent)
if ent.name is None:
return
# TODO reject names that differ only in '_' vs. '.' vs. '-',
# because they're liable to clash in generated C.
other_ent = self._entity_dict.get(ent.name)
if other_ent:
if other_ent.info:
where = QAPIError(other_ent.info, None, "previous definition")
raise QAPISemError(
ent.info,
"'%s' is already defined\n%s" % (ent.name, where))
raise QAPISemError(
ent.info, "%s is already defined" % other_ent.describe())
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 resolve_type(self, name, info, what):
typ = self.lookup_type(name)
if not typ:
if callable(what):
what = what(info)
raise QAPISemError(
info, "%s uses unknown type '%s'" % (what, name))
return typ
def _def_include(self, expr, info, doc):
include = expr['include']
assert doc is None
main_info = info
while main_info.parent:
main_info = main_info.parent
fname = os.path.relpath(include, os.path.dirname(main_info.fname))
self._def_entity(QAPISchemaInclude(fname, info))
def _def_builtin_type(self, name, json_type, c_type):
self._def_entity(QAPISchemaBuiltinType(name, json_type, c_type))
# Instantiating only the arrays that are actually used would
# be nice, but we can't as long as their generated code
# (qapi-builtin-types.[ch]) may be shared by some other
# schema.
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),
('null', 'null', 'QNull' + pointer_suffix)]:
self._def_builtin_type(*t)
self.the_empty_object_type = QAPISchemaObjectType(
'q_empty', None, None, None, None, [], None, [])
self._def_entity(self.the_empty_object_type)
qtypes = ['none', 'qnull', 'qnum', 'qstring', 'qdict', 'qlist',
'qbool']
qtype_values = self._make_enum_members(
[{'name': n} for n in qtypes], None)
self._def_entity(QAPISchemaEnumType('QType', None, None, None,
qtype_values, 'QTYPE'))
def _make_features(self, features, info):
return [QAPISchemaFeature(f['name'], info, f.get('if'))
for f in features]
def _make_enum_members(self, values, info):
return [QAPISchemaEnumMember(v['name'], info, v.get('if'))
for v in values]
def _make_implicit_enum_type(self, name, info, ifcond, values):
# See also QAPISchemaObjectTypeMember.describe()
name = name + 'Kind' # reserved by check_defn_name_str()
self._def_entity(QAPISchemaEnumType(
name, info, None, ifcond, self._make_enum_members(values, info),
None))
return name
def _make_array_type(self, element_type, info):
name = element_type + 'List' # reserved by check_defn_name_str()
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, ifcond,
role, members):
if not members:
return None
# See also QAPISchemaObjectTypeMember.describe()
name = 'q_obj_%s-%s' % (name, role)
typ = self.lookup_entity(name, QAPISchemaObjectType)
if typ:
# The implicit object type has multiple users. This can
# happen only for simple unions' implicit wrapper types.
# Its ifcond should be the disjunction of its user's
# ifconds. Not implemented. Instead, we always pass the
# wrapped type's ifcond, which is trivially the same for all
# users. It's also necessary for the wrapper to compile.
# But it's not tight: the disjunction need not imply it. We
# may end up compiling useless wrapper types.
# TODO kill simple unions or implement the disjunction
assert (ifcond or []) == typ._ifcond # pylint: disable=protected-access
else:
self._def_entity(QAPISchemaObjectType(name, info, doc, ifcond,
None, members, None, []))
return name
def _def_enum_type(self, expr, info, doc):
name = expr['enum']
data = expr['data']
prefix = expr.get('prefix')
ifcond = expr.get('if')
self._def_entity(QAPISchemaEnumType(
name, info, doc, ifcond,
self._make_enum_members(data, info), prefix))
def _make_member(self, name, typ, ifcond, 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, info, typ, optional, ifcond)
def _make_members(self, data, info):
return [self._make_member(key, value['type'], value.get('if'), info)
for (key, value) in data.items()]
def _def_struct_type(self, expr, info, doc):
name = expr['struct']
base = expr.get('base')
data = expr['data']
ifcond = expr.get('if')
features = expr.get('features', [])
self._def_entity(QAPISchemaObjectType(
name, info, doc, ifcond, base,
self._make_members(data, info),
None,
self._make_features(features, info)))
def _make_variant(self, case, typ, ifcond, info):
return QAPISchemaObjectTypeVariant(case, info, typ, ifcond)
def _make_simple_variant(self, case, typ, ifcond, 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, self.lookup_type(typ),
'wrapper', [self._make_member('data', typ, None, info)])
return QAPISchemaObjectTypeVariant(case, info, typ, ifcond)
def _def_union_type(self, expr, info, doc):
name = expr['union']
data = expr['data']
base = expr.get('base')
ifcond = expr.get('if')
tag_name = expr.get('discriminator')
tag_member = None
if isinstance(base, dict):
base = self._make_implicit_object_type(
name, info, doc, ifcond,
'base', self._make_members(base, info))
if tag_name:
variants = [self._make_variant(key, value['type'],
value.get('if'), info)
for (key, value) in data.items()]
members = []
else:
variants = [self._make_simple_variant(key, value['type'],
value.get('if'), info)
for (key, value) in data.items()]
enum = [{'name': v.name, 'if': v.ifcond} for v in variants]
typ = self._make_implicit_enum_type(name, info, ifcond, enum)
tag_member = QAPISchemaObjectTypeMember('type', info, typ, False)
members = [tag_member]
self._def_entity(
QAPISchemaObjectType(name, info, doc, ifcond, base, members,
QAPISchemaObjectTypeVariants(
tag_name, info, tag_member, variants),
[]))
def _def_alternate_type(self, expr, info, doc):
name = expr['alternate']
data = expr['data']
ifcond = expr.get('if')
variants = [self._make_variant(key, value['type'], value.get('if'),
info)
for (key, value) in data.items()]
tag_member = QAPISchemaObjectTypeMember('type', info, 'QType', False)
self._def_entity(
QAPISchemaAlternateType(name, info, doc, ifcond,
QAPISchemaObjectTypeVariants(
None, info, 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)
allow_oob = expr.get('allow-oob', False)
allow_preconfig = expr.get('allow-preconfig', False)
ifcond = expr.get('if')
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
name, info, doc, ifcond, '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, ifcond, data, rets,
gen, success_response,
boxed, allow_oob, allow_preconfig))
def _def_event(self, expr, info, doc):
name = expr['event']
data = expr.get('data')
boxed = expr.get('boxed', False)
ifcond = expr.get('if')
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
name, info, doc, ifcond, 'arg', self._make_members(data, info))
self._def_entity(QAPISchemaEvent(name, info, doc, ifcond, data, boxed))
def _def_exprs(self, exprs):
for expr_elem in 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)
elif 'include' in expr:
self._def_include(expr, info, doc)
else:
assert False
def check(self):
for ent in self._entity_list:
ent.check(self)
def visit(self, visitor):
visitor.visit_begin(self)
module = None
visitor.visit_module(module)
for entity in self._entity_list:
if visitor.visit_needed(entity):
if entity.module != module:
module = entity.module
visitor.visit_module(module)
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 = ''
length = len(c_fun_str)
for i in range(length):
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 < length - 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()
if hasattr(str, 'maketrans'):
c_name_trans = str.maketrans('.-', '__')
else:
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', 'i386'])
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, 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 c_fname(filename):
return re.sub(r'[^A-Za-z0-9_]', '_', filename)
def guardstart(name):
return mcgen('''
#ifndef %(name)s
#define %(name)s
''',
name=c_fname(name).upper())
def guardend(name):
return mcgen('''
#endif /* %(name)s */
''',
name=c_fname(name).upper())
def gen_if(ifcond):
ret = ''
for ifc in ifcond:
ret += mcgen('''
#if %(cond)s
''', cond=ifc)
return ret
def gen_endif(ifcond):
ret = ''
for ifc in reversed(ifcond):
ret += mcgen('''
#endif /* %(cond)s */
''', cond=ifc)
return ret
def _wrap_ifcond(ifcond, before, after):
if before == after:
return after # suppress empty #if ... #endif
assert after.startswith(before)
out = before
added = after[len(before):]
if added[0] == '\n':
out += '\n'
added = added[1:]
out += gen_if(ifcond)
out += added
out += gen_endif(ifcond)
return out
def gen_enum_lookup(name, members, prefix=None):
ret = mcgen('''
const QEnumLookup %(c_name)s_lookup = {
.array = (const char *const[]) {
''',
c_name=c_name(name))
for m in members:
ret += gen_if(m.ifcond)
index = c_enum_const(name, m.name, prefix)
ret += mcgen('''
[%(index)s] = "%(name)s",
''',
index=index, name=m.name)
ret += gen_endif(m.ifcond)
ret += mcgen('''
},
.size = %(max_index)s
};
''',
max_index=c_enum_const(name, '_MAX', prefix))
return ret
def gen_enum(name, members, prefix=None):
# append automatically generated _MAX value
enum_members = members + [QAPISchemaEnumMember('_MAX', None)]
ret = mcgen('''
typedef enum %(c_name)s {
''',
c_name=c_name(name))
for m in enum_members:
ret += gen_if(m.ifcond)
ret += mcgen('''
%(c_enum)s,
''',
c_enum=c_enum_const(name, m.name, prefix))
ret += gen_endif(m.ifcond)
ret += mcgen('''
} %(c_name)s;
''',
c_name=c_name(name))
ret += mcgen('''
#define %(c_name)s_str(val) \\
qapi_enum_lookup(&%(c_name)s_lookup, (val))
extern const QEnumLookup %(c_name)s_lookup;
''',
c_name=c_name(name))
return ret
def build_params(arg_type, boxed, extra=None):
ret = ''
sep = ''
if boxed:
assert arg_type
ret += '%s arg' % arg_type.c_param_type()
sep = ', '
elif arg_type:
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 if ret else 'void'
#
# Accumulate and write output
#
class QAPIGen(object):
def __init__(self, fname):
self.fname = fname
self._preamble = ''
self._body = ''
def preamble_add(self, text):
self._preamble += text
def add(self, text):
self._body += text
def get_content(self):
return self._top() + self._preamble + self._body + self._bottom()
def _top(self):
return ''
def _bottom(self):
return ''
def write(self, output_dir):
pathname = os.path.join(output_dir, self.fname)
dir = os.path.dirname(pathname)
if dir:
try:
os.makedirs(dir)
except os.error as e:
if e.errno != errno.EEXIST:
raise
fd = os.open(pathname, os.O_RDWR | os.O_CREAT, 0o666)
if sys.version_info[0] >= 3:
f = open(fd, 'r+', encoding='utf-8')
else:
f = os.fdopen(fd, 'r+')
text = self.get_content()
oldtext = f.read(len(text) + 1)
if text != oldtext:
f.seek(0)
f.truncate(0)
f.write(text)
f.close()
@contextmanager
def ifcontext(ifcond, *args):
"""A 'with' statement context manager to wrap with start_if()/end_if()
*args: any number of QAPIGenCCode
Example::
with ifcontext(ifcond, self._genh, self._genc):
modify self._genh and self._genc ...
Is equivalent to calling::
self._genh.start_if(ifcond)
self._genc.start_if(ifcond)
modify self._genh and self._genc ...
self._genh.end_if()
self._genc.end_if()
"""
for arg in args:
arg.start_if(ifcond)
yield
for arg in args:
arg.end_if()
class QAPIGenCCode(QAPIGen):
def __init__(self, fname):
QAPIGen.__init__(self, fname)
self._start_if = None
def start_if(self, ifcond):
assert self._start_if is None
self._start_if = (ifcond, self._body, self._preamble)
def end_if(self):
assert self._start_if
self._wrap_ifcond()
self._start_if = None
def _wrap_ifcond(self):
self._body = _wrap_ifcond(self._start_if[0],
self._start_if[1], self._body)
self._preamble = _wrap_ifcond(self._start_if[0],
self._start_if[2], self._preamble)
def get_content(self):
assert self._start_if is None
return QAPIGen.get_content(self)
class QAPIGenC(QAPIGenCCode):
def __init__(self, fname, blurb, pydoc):
QAPIGenCCode.__init__(self, fname)
self._blurb = blurb
self._copyright = '\n * '.join(re.findall(r'^Copyright .*', pydoc,
re.MULTILINE))
def _top(self):
return mcgen('''
/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
/*
%(blurb)s
*
* %(copyright)s
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*/
''',
blurb=self._blurb, copyright=self._copyright)
def _bottom(self):
return mcgen('''
/* Dummy declaration to prevent empty .o file */
char qapi_dummy_%(name)s;
''',
name=c_fname(self.fname))
class QAPIGenH(QAPIGenC):
def _top(self):
return QAPIGenC._top(self) + guardstart(self.fname)
def _bottom(self):
return guardend(self.fname)
class QAPIGenDoc(QAPIGen):
def _top(self):
return (QAPIGen._top(self)
+ '@c AUTOMATICALLY GENERATED, DO NOT MODIFY\n\n')
class QAPISchemaMonolithicCVisitor(QAPISchemaVisitor):
def __init__(self, prefix, what, blurb, pydoc):
self._prefix = prefix
self._what = what
self._genc = QAPIGenC(self._prefix + self._what + '.c',
blurb, pydoc)
self._genh = QAPIGenH(self._prefix + self._what + '.h',
blurb, pydoc)
def write(self, output_dir):
self._genc.write(output_dir)
self._genh.write(output_dir)
class QAPISchemaModularCVisitor(QAPISchemaVisitor):
def __init__(self, prefix, what, blurb, pydoc):
self._prefix = prefix
self._what = what
self._blurb = blurb
self._pydoc = pydoc
self._genc = None
self._genh = None
self._module = {}
self._main_module = None
@staticmethod
def _is_user_module(name):
return name and not name.startswith('./')
@staticmethod
def _is_builtin_module(name):
return not name
def _module_dirname(self, what, name):
if self._is_user_module(name):
return os.path.dirname(name)
return ''
def _module_basename(self, what, name):
ret = '' if self._is_builtin_module(name) else self._prefix
if self._is_user_module(name):
basename = os.path.basename(name)
ret += what
if name != self._main_module:
ret += '-' + os.path.splitext(basename)[0]
else:
name = name[2:] if name else 'builtin'
ret += re.sub(r'-', '-' + name + '-', what)
return ret
def _module_filename(self, what, name):
return os.path.join(self._module_dirname(what, name),
self._module_basename(what, name))
def _add_module(self, name, blurb):
basename = self._module_filename(self._what, name)
genc = QAPIGenC(basename + '.c', blurb, self._pydoc)
genh = QAPIGenH(basename + '.h', blurb, self._pydoc)
self._module[name] = (genc, genh)
self._set_module(name)
def _add_user_module(self, name, blurb):
assert self._is_user_module(name)
if self._main_module is None:
self._main_module = name
self._add_module(name, blurb)
def _add_system_module(self, name, blurb):
self._add_module(name and './' + name, blurb)
def _set_module(self, name):
self._genc, self._genh = self._module[name]
def write(self, output_dir, opt_builtins=False):
for name in self._module:
if self._is_builtin_module(name) and not opt_builtins:
continue
(genc, genh) = self._module[name]
genc.write(output_dir)
genh.write(output_dir)
def _begin_user_module(self, name):
pass
def visit_module(self, name):
if name in self._module:
self._set_module(name)
elif self._is_builtin_module(name):
# The built-in module has not been created. No code may
# be generated.
self._genc = None
self._genh = None
else:
self._add_user_module(name, self._blurb)
self._begin_user_module(name)
def visit_include(self, name, info):
relname = os.path.relpath(self._module_filename(self._what, name),
os.path.dirname(self._genh.fname))
self._genh.preamble_add(mcgen('''
#include "%(relname)s.h"
''',
relname=relname))
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