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f371fa9105
unicorn/qemu/scripts/qapi-types.py
Eric Blake f371fa9105
qapi: Simplify gen_visit_fields() error handling 
Since we have consolidated all generated code to use 'err' as
the name of the local variable for error detection, we can
simplify the decision on whether to skip error detection (useful
for deallocation paths) to be a boolean.

Backports commit 18bdbc3ac8b477e160d56aa6ecd6942495ce44d0 from qemu
2018-02-19 18:45:05 -05:00

333 lines
8.7 KiB
Python
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#
# QAPI types generator
#
# Copyright IBM, Corp. 2011
# Copyright (c) 2013-2015 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 qapi import *
def gen_fwd_object_or_array(name):
return mcgen('''
typedef struct %(c_name)s %(c_name)s;
''',
c_name=c_name(name))
def gen_array(name, element_type):
return mcgen('''
struct %(c_name)s {
union {
%(c_type)s value;
uint64_t padding;
};
struct %(c_name)s *next;
};
''',
c_name=c_name(name), c_type=element_type.c_type())
def gen_struct_field(name, typ, optional):
ret = ''
if optional:
ret += mcgen('''
bool has_%(c_name)s;
''',
c_name=c_name(name))
ret += mcgen('''
%(c_type)s %(c_name)s;
''',
c_type=typ.c_type(), c_name=c_name(name))
return ret
def gen_struct_fields(members):
ret = ''
for memb in members:
ret += gen_struct_field(memb.name, memb.type, memb.optional)
return ret
def gen_struct(name, base, members):
ret = mcgen('''
struct %(c_name)s {
''',
c_name=c_name(name))
if base:
ret += gen_struct_field('base', base, False)
ret += gen_struct_fields(members)
# Make sure that all structs have at least one field; this avoids
# potential issues with attempting to malloc space for zero-length
# structs in C, and also incompatibility with C++ (where an empty
# struct is size 1).
if not base and not members:
ret += mcgen('''
char qapi_dummy_field_for_empty_struct;
''')
ret += mcgen('''
};
''')
return ret
def gen_alternate_qtypes_decl(name):
return mcgen('''
extern const int %(c_name)s_qtypes[];
''',
c_name=c_name(name))
def gen_alternate_qtypes(name, variants):
ret = mcgen('''
const int %(c_name)s_qtypes[QTYPE_MAX] = {
''',
c_name=c_name(name))
for var in variants.variants:
qtype = var.type.alternate_qtype()
assert qtype
ret += mcgen('''
[%(qtype)s] = %(enum_const)s,
''',
qtype=qtype,
enum_const=c_enum_const(variants.tag_member.type.name,
var.name))
ret += mcgen('''
};
''')
return ret
def gen_union(name, base, variants):
ret = mcgen('''
struct %(c_name)s {
''',
c_name=c_name(name))
if base:
ret += mcgen('''
/* Members inherited from %(c_name)s: */
''',
c_name=c_name(base.name))
ret += gen_struct_fields(base.members)
ret += mcgen('''
/* Own members: */
''')
else:
ret += mcgen('''
%(c_type)s kind;
''',
c_type=c_name(variants.tag_member.type.name))
# FIXME: What purpose does data serve, besides preventing a union that
# has a branch named 'data'? We use it in qapi-visit.py to decide
# whether to bypass the switch statement if visiting the discriminator
# failed; but since we 0-initialize structs, and cannot tell what
# branch of the union is in use if the discriminator is invalid, there
# should not be any data leaks even without a data pointer. Or, if
# 'data' is merely added to guarantee we don't have an empty union,
# shouldn't we enforce that at .json parse time?
ret += mcgen('''
union { /* union tag is @%(c_name)s */
void *data;
''',
# TODO ugly special case for simple union
# Use same tag name in C as on the wire to get rid of
# it, then: c_name=c_name(variants.tag_member.name)
c_name=c_name(variants.tag_name or 'kind'))
for var in variants.variants:
# Ugly special case for simple union TODO get rid of it
typ = var.simple_union_type() or var.type
ret += mcgen('''
%(c_type)s %(c_name)s;
''',
c_type=typ.c_type(),
c_name=c_name(var.name))
ret += mcgen('''
};
};
''')
return ret
def gen_type_cleanup_decl(name):
ret = mcgen('''
void qapi_free_%(c_name)s(%(c_name)s *obj);
''',
c_name=c_name(name))
return ret
def gen_type_cleanup(name):
ret = mcgen('''
void qapi_free_%(c_name)s(%(c_name)s *obj)
{
QapiDeallocVisitor *qdv;
Visitor *v;
if (!obj) {
return;
}
qdv = qapi_dealloc_visitor_new();
v = qapi_dealloc_get_visitor(qdv);
visit_type_%(c_name)s(v, &obj, NULL, NULL);
qapi_dealloc_visitor_cleanup(qdv);
}
''',
c_name=c_name(name))
return ret
class QAPISchemaGenTypeVisitor(QAPISchemaVisitor):
def __init__(self):
self.decl = None
self.defn = None
self._fwdecl = None
self._fwdefn = None
self._btin = None
def visit_begin(self, schema):
self.decl = ''
self.defn = ''
self._fwdecl = ''
self._fwdefn = ''
self._btin = guardstart('QAPI_TYPES_BUILTIN')
def visit_end(self):
self.decl = self._fwdecl + self.decl
self._fwdecl = None
self.defn = self._fwdefn + self.defn
self._fwdefn = None
# To avoid header dependency hell, we always generate
# declarations for built-in types in our header files and
# simply guard them. See also do_builtins (command line
# option -b).
self._btin += guardend('QAPI_TYPES_BUILTIN')
self.decl = self._btin + self.decl
self._btin = None
def _gen_type_cleanup(self, name):
self.decl += gen_type_cleanup_decl(name)
self.defn += gen_type_cleanup(name)
def visit_enum_type(self, name, info, values, prefix):
self._fwdecl += gen_enum(name, values, prefix)
self._fwdefn += gen_enum_lookup(name, values, prefix)
def visit_array_type(self, name, info, element_type):
if isinstance(element_type, QAPISchemaBuiltinType):
self._btin += gen_fwd_object_or_array(name)
self._btin += gen_array(name, element_type)
self._btin += gen_type_cleanup_decl(name)
if do_builtins:
self.defn += gen_type_cleanup(name)
else:
self._fwdecl += gen_fwd_object_or_array(name)
self.decl += gen_array(name, element_type)
self._gen_type_cleanup(name)
def visit_object_type(self, name, info, base, members, variants):
if info:
self._fwdecl += gen_fwd_object_or_array(name)
if variants:
assert not members # not implemented
self.decl += gen_union(name, base, variants)
else:
self.decl += gen_struct(name, base, members)
self._gen_type_cleanup(name)
def visit_alternate_type(self, name, info, variants):
self._fwdecl += gen_fwd_object_or_array(name)
self._fwdefn += gen_alternate_qtypes(name, variants)
self.decl += gen_union(name, None, variants)
self.decl += gen_alternate_qtypes_decl(name)
self._gen_type_cleanup(name)
# If you link code generated from multiple schemata, you want only one
# instance of the code for built-in types. Generate it only when
# do_builtins, enabled by command line option -b. See also
# QAPISchemaGenTypeVisitor.visit_end().
do_builtins = False
(input_file, output_dir, do_c, do_h, prefix, opts) = \
parse_command_line("b", ["builtins"])
for o, a in opts:
if o in ("-b", "--builtins"):
do_builtins = True
c_comment = '''
/*
* deallocation functions for schema-defined QAPI types
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Michael Roth <mdroth@linux.vnet.ibm.com>
*
* 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.
*
*/
'''
h_comment = '''
/*
* schema-defined QAPI types
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* 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.
*
*/
'''
(fdef, fdecl) = open_output(output_dir, do_c, do_h, prefix,
'qapi-types.c', 'qapi-types.h',
c_comment, h_comment)
fdef.write(mcgen('''
#include "qapi/dealloc-visitor.h"
#include "%(prefix)sqapi-types.h"
#include "%(prefix)sqapi-visit.h"
''',
prefix=prefix))
fdecl.write(mcgen('''
#include "qapi/qmp/qobject.h"
#include "unicorn/platform.h"
'''))
schema = QAPISchema(input_file)
gen = QAPISchemaGenTypeVisitor()
schema.visit(gen)
fdef.write(gen.defn)
fdecl.write(gen.decl)
close_output(fdef, fdecl)
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