blob: a6179a8f4b677fde965621e9721bb05a767b8435 [file] [log] [blame]
#!/usr/bin/env python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
""" Generator for C style prototypes and definitions """
import glob
import os
import sys
from idl_log import ErrOut, InfoOut, WarnOut
from idl_node import IDLNode
from idl_ast import IDLAst
from idl_option import GetOption, Option, ParseOptions
from idl_parser import ParseFiles
Option('cgen_debug', 'Debug generate.')
class CGenError(Exception):
def __init__(self, msg):
self.value = msg
def __str__(self):
return repr(self.value)
def CommentLines(lines, tabs=0):
# Generate a C style comment block by prepending the block with '<tab>/*'
# and adding a '<tab> *' per line.
tab = ' ' * tabs
out = '%s/*' % tab + ('\n%s *' % tab).join(lines)
# Add a terminating ' */' unless the last line is blank which would mean it
# already has ' *'
if not lines[-1]:
out += '/\n'
out += ' */\n'
return out
def Comment(node, prefix=None, tabs=0):
# Generate a comment block from the provided Comment node.
comment = node.GetName()
lines = comment.split('\n')
# If an option prefix is provided, then prepend that to the comment
# for this node.
if prefix:
prefix_lines = prefix.split('\n')
# If both the prefix and comment start with a blank line ('*') remove
# the extra one.
if prefix_lines[0] == '*' and lines[0] == '*':
lines = prefix_lines + lines[1:]
lines = prefix_lines + lines;
return CommentLines(lines, tabs)
def GetNodeComments(node, tabs=0):
# Generate a comment block joining all comment nodes which are children of
# the provided node.
comment_txt = ''
for doc in node.GetListOf('Comment'):
comment_txt += Comment(doc, tabs=tabs)
return comment_txt
class CGen(object):
# TypeMap
# TypeMap modifies how an object is stored or passed, for example pointers
# are passed as 'const' if they are 'in' parameters, and structures are
# preceeded by the keyword 'struct' as well as using a pointer.
TypeMap = {
'Array': {
'in': 'const %s',
'inout': '%s',
'out': '%s*',
'store': '%s',
'return': '%s',
'ref': '%s*'
'Callspec': {
'in': '%s',
'inout': '%s',
'out': '%s',
'store': '%s',
'return': '%s'
'Enum': {
'in': '%s',
'inout': '%s*',
'out': '%s*',
'store': '%s',
'return': '%s'
'Interface': {
'in': 'const %s*',
'inout': '%s*',
'out': '%s**',
'return': '%s*',
'store': '%s*'
'Struct': {
'in': 'const %s*',
'inout': '%s*',
'out': '%s*',
'return': ' %s*',
'store': '%s',
'ref': '%s*'
'blob_t': {
'in': 'const %s',
'inout': '%s',
'out': '%s',
'return': '%s',
'store': '%s'
'mem_t': {
'in': 'const %s',
'inout': '%s',
'out': '%s',
'return': '%s',
'store': '%s'
'mem_ptr_t': {
'in': 'const %s',
'inout': '%s',
'out': '%s',
'return': '%s',
'store': '%s'
'str_t': {
'in': 'const %s',
'inout': '%s',
'out': '%s',
'return': 'const %s',
'store': '%s'
'cstr_t': {
'in': '%s',
'inout': '%s*',
'out': '%s*',
'return': '%s',
'store': '%s'
'TypeValue': {
'in': '%s',
'inout': '%s*',
'out': '%s*',
'return': '%s',
'store': '%s'
# RemapName
# A diction array of PPAPI types that are converted to language specific
# types before being returned by by the C generator
RemapName = {
'blob_t': 'void**',
'float_t': 'float',
'double_t': 'double',
'handle_t': 'int',
'mem_t': 'void*',
'mem_ptr_t': 'void**',
'str_t': 'char*',
'cstr_t': 'const char*',
'interface_t' : 'const void*'
def __init__(self):
self.dbg_depth = 0
# Debug Logging functions
def Log(self, txt):
if not GetOption('cgen_debug'): return
tabs = ' ' * self.dbg_depth
print '%s%s' % (tabs, txt)
def LogEnter(self, txt):
if txt: self.Log(txt)
self.dbg_depth += 1
def LogExit(self, txt):
self.dbg_depth -= 1
if txt: self.Log(txt)
def GetDefine(self, name, value):
out = '#define %s %s' % (name, value)
if len(out) > 80:
out = '#define %s \\\n %s' % (name, value)
return '%s\n' % out
# Interface strings
def GetMacroHelper(self, node):
macro = node.GetProperty('macro')
if macro: return macro
name = node.GetName()
name = name.upper()
return "%s_INTERFACE" % name
def GetInterfaceMacro(self, node, version = None):
name = self.GetMacroHelper(node)
if version is None:
return name
return '%s_%s' % (name, str(version).replace('.', '_'))
def GetInterfaceString(self, node, version = None):
# If an interface name is specified, use that
name = node.GetProperty('iname')
if not name:
# Otherwise, the interface name is the object's name
# With '_Dev' replaced by '(Dev)' if it's a Dev interface.
name = node.GetName()
if name.endswith('_Dev'):
name = '%s(Dev)' % name[:-4]
if version is None:
return name
return "%s;%s" % (name, version)
# Return the array specification of the object.
def GetArraySpec(self, node):
assert(node.cls == 'Array')
fixed = node.GetProperty('FIXED')
if fixed:
return '[%s]' % fixed
return '[]'
# GetTypeName
# For any valid 'typed' object such as Member or Typedef
# the typenode object contains the typename
# For a given node return the type name by passing mode.
def GetTypeName(self, node, release, prefix=''):
self.LogEnter('GetTypeName of %s rel=%s' % (node, release))
# For Members, Params, and Typedefs get the type it refers to otherwise
# the node in question is it's own type (struct, union etc...)
if node.IsA('Member', 'Param', 'Typedef'):
typeref = node.GetType(release)
typeref = node
if typeref is None:
node.Error('No type at release %s.' % release)
raise CGenError('No type for %s' % node)
# If the type is a (BuiltIn) Type then return it's name
# remapping as needed
if typeref.IsA('Type'):
name = CGen.RemapName.get(typeref.GetName(), None)
if name is None: name = typeref.GetName()
name = '%s%s' % (prefix, name)
# For Interfaces, use the name + version
elif typeref.IsA('Interface'):
rel = typeref.first_release[release]
name = 'struct %s%s' % (prefix, self.GetStructName(typeref, rel, True))
# For structures, preceed with 'struct' or 'union' as appropriate
elif typeref.IsA('Struct'):
if typeref.GetProperty('union'):
name = 'union %s%s' % (prefix, typeref.GetName())
name = 'struct %s%s' % (prefix, typeref.GetName())
# If it's an enum, or typedef then return the Enum's name
elif typeref.IsA('Enum', 'Typedef'):
if not typeref.LastRelease(release):
first = node.first_release[release]
ver = '_' + node.GetVersion(first).replace('.','_')
ver = ''
# The enum may have skipped having a typedef, we need prefix with 'enum'.
if typeref.GetProperty('notypedef'):
name = 'enum %s%s%s' % (prefix, typeref.GetName(), ver)
name = '%s%s%s' % (prefix, typeref.GetName(), ver)
raise RuntimeError('Getting name of non-type %s.' % node)
self.LogExit('GetTypeName %s is %s' % (node, name))
return name
# GetRootType
# For a given node return basic type of that object. This is
# either a 'Type', 'Callspec', or 'Array'
def GetRootTypeMode(self, node, release, mode):
self.LogEnter('GetRootType of %s' % node)
# If it has an array spec, then treat it as an array regardless of type
if node.GetOneOf('Array'):
rootType = 'Array'
# Or if it has a callspec, treat it as a function
elif node.GetOneOf('Callspec'):
rootType, mode = self.GetRootTypeMode(node.GetType(release), release,
# If it's a plain typedef, try that object's root type
elif node.IsA('Member', 'Param', 'Typedef'):
rootType, mode = self.GetRootTypeMode(node.GetType(release),
release, mode)
# If it's an Enum, then it's normal passing rules
elif node.IsA('Enum'):
rootType = node.cls
# If it's an Interface or Struct, we may be passing by value
elif node.IsA('Interface', 'Struct'):
if mode == 'return':
if node.GetProperty('returnByValue'):
rootType = 'TypeValue'
rootType = node.cls
if node.GetProperty('passByValue'):
rootType = 'TypeValue'
rootType = node.cls
# If it's an Basic Type, check if it's a special type
elif node.IsA('Type'):
if node.GetName() in CGen.TypeMap:
rootType = node.GetName()
rootType = 'TypeValue'
raise RuntimeError('Getting root type of non-type %s.' % node)
self.LogExit('RootType is "%s"' % rootType)
return rootType, mode
def GetTypeByMode(self, node, release, mode):
self.LogEnter('GetTypeByMode of %s mode=%s release=%s' %
(node, mode, release))
name = self.GetTypeName(node, release)
ntype, mode = self.GetRootTypeMode(node, release, mode)
out = CGen.TypeMap[ntype][mode] % name
self.LogExit('GetTypeByMode %s = %s' % (node, out))
return out
# Get the passing mode of the object (in, out, inout).
def GetParamMode(self, node):
self.Log('GetParamMode for %s' % node)
if node.GetProperty('in'): return 'in'
if node.GetProperty('out'): return 'out'
if node.GetProperty('inout'): return 'inout'
return 'return'
# GetComponents
# Returns the signature components of an object as a tuple of
# (rtype, name, arrays, callspec) where:
# rtype - The store or return type of the object.
# name - The name of the object.
# arrays - A list of array dimensions as [] or [<fixed_num>].
# args - None if not a function, otherwise a list of parameters.
def GetComponents(self, node, release, mode):
self.LogEnter('GetComponents mode %s for %s %s' % (mode, node, release))
# Generate passing type by modifying root type
rtype = self.GetTypeByMode(node, release, mode)
if node.IsA('Enum', 'Interface', 'Struct'):
rname = node.GetName()
rname = node.GetType(release).GetName()
if rname in CGen.RemapName:
rname = CGen.RemapName[rname]
if '%' in rtype:
rtype = rtype % rname
name = node.GetName()
arrayspec = [self.GetArraySpec(array) for array in node.GetListOf('Array')]
callnode = node.GetOneOf('Callspec')
if callnode:
callspec = []
for param in callnode.GetListOf('Param'):
if not param.IsRelease(release):
mode = self.GetParamMode(param)
ptype, pname, parray, pspec = self.GetComponents(param, release, mode)
callspec.append((ptype, pname, parray, pspec))
callspec = None
self.LogExit('GetComponents: %s, %s, %s, %s' %
(rtype, name, arrayspec, callspec))
return (rtype, name, arrayspec, callspec)
def Compose(self, rtype, name, arrayspec, callspec, prefix, func_as_ptr,
include_name, unsized_as_ptr):
self.LogEnter('Compose: %s %s' % (rtype, name))
arrayspec = ''.join(arrayspec)
# Switch unsized array to a ptr. NOTE: Only last element can be unsized.
if unsized_as_ptr and arrayspec[-2:] == '[]':
prefix += '*'
if not include_name:
name = prefix + arrayspec
name = prefix + name + arrayspec
if callspec is None:
out = '%s %s' % (rtype, name)
params = []
for ptype, pname, parray, pspec in callspec:
params.append(self.Compose(ptype, pname, parray, pspec, '', True,
if func_as_ptr:
name = '(*%s)' % name
if not params:
params = ['void']
out = '%s %s(%s)' % (rtype, name, ', '.join(params))
self.LogExit('Exit Compose: %s' % out)
return out
# GetSignature
# Returns the 'C' style signature of the object
# prefix - A prefix for the object's name
# func_as_ptr - Formats a function as a function pointer
# include_name - If true, include member name in the signature.
# If false, leave it out. In any case, prefix is always
# included.
# include_version - if True, include version in the member name
def GetSignature(self, node, release, mode, prefix='', func_as_ptr=True,
include_name=True, include_version=False):
self.LogEnter('GetSignature %s %s as func=%s' %
(node, mode, func_as_ptr))
rtype, name, arrayspec, callspec = self.GetComponents(node, release, mode)
if include_version:
name = self.GetStructName(node, release, True)
# If not a callspec (such as a struct) use a ptr instead of []
unsized_as_ptr = not callspec
out = self.Compose(rtype, name, arrayspec, callspec, prefix,
func_as_ptr, include_name, unsized_as_ptr)
self.LogExit('Exit GetSignature: %s' % out)
return out
# Define a Typedef.
def DefineTypedef(self, node, releases, prefix='', comment=False):
__pychecker__ = 'unusednames=comment'
build_list = node.GetUniqueReleases(releases)
out = 'typedef %s;\n' % self.GetSignature(node, build_list[-1], 'return',
prefix, True,
# Version mangle any other versions
for index, rel in enumerate(build_list[:-1]):
out += '\n'
out += 'typedef %s;\n' % self.GetSignature(node, rel, 'return',
prefix, True,
self.Log('DefineTypedef: %s' % out)
return out
# Define an Enum.
def DefineEnum(self, node, releases, prefix='', comment=False):
__pychecker__ = 'unusednames=comment,releases'
self.LogEnter('DefineEnum %s' % node)
name = '%s%s' % (prefix, node.GetName())
notypedef = node.GetProperty('notypedef')
unnamed = node.GetProperty('unnamed')
if unnamed:
out = 'enum {'
elif notypedef:
out = 'enum %s {' % name
out = 'typedef enum {'
enumlist = []
for child in node.GetListOf('EnumItem'):
value = child.GetProperty('VALUE')
comment_txt = GetNodeComments(child, tabs=1)
if value:
item_txt = '%s%s = %s' % (prefix, child.GetName(), value)
item_txt = '%s%s' % (prefix, child.GetName())
enumlist.append('%s %s' % (comment_txt, item_txt))
self.LogExit('Exit DefineEnum')
if unnamed or notypedef:
out = '%s\n%s\n};\n' % (out, ',\n'.join(enumlist))
out = '%s\n%s\n} %s;\n' % (out, ',\n'.join(enumlist), name)
return out
def DefineMember(self, node, releases, prefix='', comment=False):
__pychecker__ = 'unusednames=prefix,comment'
release = releases[0]
self.LogEnter('DefineMember %s' % node)
if node.GetProperty('ref'):
out = '%s;' % self.GetSignature(node, release, 'ref', '', True)
out = '%s;' % self.GetSignature(node, release, 'store', '', True)
self.LogExit('Exit DefineMember')
return out
def GetStructName(self, node, release, include_version=False):
suffix = ''
if include_version:
ver_num = node.GetVersion(release)
suffix = ('_%s' % ver_num).replace('.', '_')
return node.GetName() + suffix
def DefineStructInternals(self, node, release,
include_version=False, comment=True):
channel = node.GetProperty('FILE').release_map.GetChannel(release)
if channel == 'dev':
channel_comment = ' /* dev */'
channel_comment = ''
out = ''
if node.GetProperty('union'):
out += 'union %s {%s\n' % (
self.GetStructName(node, release, include_version), channel_comment)
out += 'struct %s {%s\n' % (
self.GetStructName(node, release, include_version), channel_comment)
channel = node.GetProperty('FILE').release_map.GetChannel(release)
# Generate Member Functions
members = []
for child in node.GetListOf('Member'):
if channel == 'stable' and child.NodeIsDevOnly():
member = self.Define(child, [release], tabs=1, comment=comment)
if not member:
out += '%s\n};\n' % '\n'.join(members)
return out
def DefineStruct(self, node, releases, prefix='', comment=False):
__pychecker__ = 'unusednames=comment,prefix'
self.LogEnter('DefineStruct %s' % node)
out = ''
build_list = node.GetUniqueReleases(releases)
newest_stable = None
newest_dev = None
for rel in build_list:
channel = node.GetProperty('FILE').release_map.GetChannel(rel)
if channel == 'stable':
newest_stable = rel
if channel == 'dev':
newest_dev = rel
last_rel = build_list[-1]
# TODO(noelallen) : Bug 157017 finish multiversion support
if node.IsA('Struct'):
if len(build_list) != 1:
node.Error('Can not support multiple versions of node.')
assert len(build_list) == 1
# Build the most recent one versioned, with comments
out = self.DefineStructInternals(node, last_rel,
include_version=False, comment=True)
if node.IsA('Interface'):
# Build the most recent one versioned, with comments
out = self.DefineStructInternals(node, last_rel,
include_version=True, comment=True)
if last_rel == newest_stable:
# Define an unversioned typedef for the most recent version
out += '\ntypedef struct %s %s;\n' % (
self.GetStructName(node, last_rel, include_version=True),
self.GetStructName(node, last_rel, include_version=False))
# Build the rest without comments and with the version number appended
for rel in build_list[0:-1]:
channel = node.GetProperty('FILE').release_map.GetChannel(rel)
# Skip dev channel interface versions that are
# Not the newest version, and
# Don't have an equivalent stable version.
if channel == 'dev' and rel != newest_dev:
if not node.DevInterfaceMatchesStable(rel):
out += '\n' + self.DefineStructInternals(node, rel,
if rel == newest_stable:
# Define an unversioned typedef for the most recent version
out += '\ntypedef struct %s %s;\n' % (
self.GetStructName(node, rel, include_version=True),
self.GetStructName(node, rel, include_version=False))
self.LogExit('Exit DefineStruct')
return out
# Copyright and Comment
# Generate a comment or copyright block
def Copyright(self, node, cpp_style=False):
lines = node.GetName().split('\n')
if cpp_style:
return '//' + '\n//'.join(filter(lambda f: f != '', lines)) + '\n'
return CommentLines(lines)
def Indent(self, data, tabs=0):
"""Handles indentation and 80-column line wrapping."""
tab = ' ' * tabs
lines = []
for line in data.split('\n'):
# Add indentation
line = tab + line
space_break = line.rfind(' ', 0, 80)
if len(line) <= 80 or 'http://' in line:
# Ignore normal line and URLs permitted by the style guide.
elif not '(' in line and space_break >= 0:
# Break long typedefs on nearest space.
lines.append(' ' + line[space_break + 1:])
left = line.rfind('(') + 1
args = line[left:].split(',')
orig_args = args
orig_left = left
# Try to split on '(arg1)' or '(arg1, arg2)', not '()'
while args[0][0] == ')':
left = line.rfind('(', 0, left - 1) + 1
if left == 0: # No more parens, take the original option
args = orig_args
left = orig_left
args = line[left:].split(',')
line_max = 0
for arg in args:
if len(arg) > line_max: line_max = len(arg)
if left + line_max >= 80:
indent = '%s ' % tab
args = (',\n%s' % indent).join([arg.strip() for arg in args])
lines.append('%s\n%s%s' % (line[:left], indent, args))
indent = ' ' * (left - 1)
args = (',\n%s' % indent).join(args)
lines.append('%s%s' % (line[:left], args))
return '\n'.join(lines)
# Define a top level object.
def Define(self, node, releases, tabs=0, prefix='', comment=False):
# If this request does not match unique release, or if the release is not
# available (possibly deprecated) then skip.
unique = node.GetUniqueReleases(releases)
if not unique or not node.InReleases(releases):
return ''
self.LogEnter('Define %s tab=%d prefix="%s"' % (node,tabs,prefix))
declmap = dict({
'Enum': CGen.DefineEnum,
'Function': CGen.DefineMember,
'Interface': CGen.DefineStruct,
'Member': CGen.DefineMember,
'Struct': CGen.DefineStruct,
'Typedef': CGen.DefineTypedef
out = ''
func = declmap.get(node.cls, None)
if not func:
ErrOut.Log('Failed to define %s named %s' % (node.cls, node.GetName()))
define_txt = func(self, node, releases, prefix=prefix, comment=comment)
comment_txt = GetNodeComments(node, tabs=0)
if comment_txt and comment:
out += comment_txt
out += define_txt
indented_out = self.Indent(out, tabs)
self.LogExit('Exit Define')
return indented_out
# Clean a string representing an object definition and return then string
# as a single space delimited set of tokens.
def CleanString(instr):
instr = instr.strip()
instr = instr.split()
return ' '.join(instr)
# Test a file, by comparing all it's objects, with their comments.
def TestFile(filenode):
cgen = CGen()
errors = 0
for node in filenode.GetChildren()[2:]:
instr = node.GetOneOf('Comment')
if not instr: continue
instr = CleanString(instr.GetName())
outstr = cgen.Define(node, releases=['M14'])
if GetOption('verbose'):
print outstr + '\n'
outstr = CleanString(outstr)
if instr != outstr:
ErrOut.Log('Failed match of\n>>%s<<\nto:\n>>%s<<\nFor:\n' %
(instr, outstr))
node.Dump(1, comments=True)
errors += 1
return errors
# Build and resolve the AST and compare each file individual.
def TestFiles(filenames):
if not filenames:
idldir = os.path.split(sys.argv[0])[0]
idldir = os.path.join(idldir, 'test_cgen', '*.idl')
filenames = glob.glob(idldir)
filenames = sorted(filenames)
ast = ParseFiles(filenames)
total_errs = 0
for filenode in ast.GetListOf('File'):
errs = TestFile(filenode)
if errs:
ErrOut.Log('%s test failed with %d error(s).' %
(filenode.GetName(), errs))
total_errs += errs
if total_errs:
ErrOut.Log('Failed generator test.')
InfoOut.Log('Passed generator test.')
return total_errs
def main(args):
filenames = ParseOptions(args)
if GetOption('test'):
return TestFiles(filenames)
ast = ParseFiles(filenames)
cgen = CGen()
for f in ast.GetListOf('File'):
if f.GetProperty('ERRORS') > 0:
print 'Skipping %s' % f.GetName()
for node in f.GetChildren()[2:]:
print cgen.Define(node, ast.releases, comment=True, prefix='tst_')
if __name__ == '__main__':