#!/usr/bin/python3 -i
#
# Copyright (c) 2013-2019 The Khronos Group Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os,re,sys,pdb
from generator import *
# CGeneratorOptions - subclass of GeneratorOptions.
#
# Adds options used by COutputGenerator objects during C language header
# generation.
#
# Additional members
# prefixText - list of strings to prefix generated header with
# (usually a copyright statement + calling convention macros).
# protectFile - True if multiple inclusion protection should be
# generated (based on the filename) around the entire header.
# protectFeature - True if #ifndef..#endif protection should be
# generated around a feature interface in the header file.
# genFuncPointers - True if function pointer typedefs should be
# generated
# protectProto - If conditional protection should be generated
# around prototype declarations, set to either '#ifdef'
# to require opt-in (#ifdef protectProtoStr) or '#ifndef'
# to require opt-out (#ifndef protectProtoStr). Otherwise
# set to None.
# protectProtoStr - #ifdef/#ifndef symbol to use around prototype
# declarations, if protectProto is set
# apicall - string to use for the function declaration prefix,
# such as APICALL on Windows.
# apientry - string to use for the calling convention macro,
# in typedefs, such as APIENTRY.
# apientryp - string to use for the calling convention macro
# in function pointer typedefs, such as APIENTRYP.
# directory - directory into which to generate include files
# indentFuncProto - True if prototype declarations should put each
# parameter on a separate line
# indentFuncPointer - True if typedefed function pointers should put each
# parameter on a separate line
# alignFuncParam - if nonzero and parameters are being put on a
# separate line, align parameter names at the specified column
class CGeneratorOptions(GeneratorOptions):
"""Represents options during C interface generation for headers"""
def __init__(self,
filename = None,
directory = '.',
apiname = None,
profile = None,
versions = '.*',
emitversions = '.*',
defaultExtensions = None,
addExtensions = None,
removeExtensions = None,
emitExtensions = None,
sortProcedure = regSortFeatures,
prefixText = "",
genFuncPointers = True,
protectFile = True,
protectFeature = True,
protectProto = None,
protectProtoStr = None,
apicall = '',
apientry = '',
apientryp = '',
indentFuncProto = True,
indentFuncPointer = False,
alignFuncParam = 0):
GeneratorOptions.__init__(self, filename, directory, apiname, profile,
versions, emitversions, defaultExtensions,
addExtensions, removeExtensions,
emitExtensions, sortProcedure)
self.prefixText = prefixText
self.genFuncPointers = genFuncPointers
self.protectFile = protectFile
self.protectFeature = protectFeature
self.protectProto = protectProto
self.protectProtoStr = protectProtoStr
self.apicall = apicall
self.apientry = apientry
self.apientryp = apientryp
self.indentFuncProto = indentFuncProto
self.indentFuncPointer = indentFuncPointer
self.alignFuncParam = alignFuncParam
# COutputGenerator - subclass of OutputGenerator.
# Generates C-language API interfaces.
#
# ---- methods ----
# COutputGenerator(errFile, warnFile, diagFile) - args as for
# OutputGenerator. Defines additional internal state.
# ---- methods overriding base class ----
# beginFile(genOpts)
# endFile()
# beginFeature(interface, emit)
# endFeature()
# genType(typeinfo,name)
# genStruct(typeinfo,name)
# genGroup(groupinfo,name)
# genEnum(enuminfo, name)
# genCmd(cmdinfo)
class COutputGenerator(OutputGenerator):
"""Generate specified API interfaces in a specific style, such as a C header"""
# This is an ordered list of sections in the header file.
TYPE_SECTIONS = ['include', 'define', 'basetype', 'handle', 'enum',
'group', 'bitmask', 'funcpointer', 'struct']
ALL_SECTIONS = TYPE_SECTIONS + ['commandPointer', 'command']
def __init__(self,
errFile = sys.stderr,
warnFile = sys.stderr,
diagFile = sys.stdout):
OutputGenerator.__init__(self, errFile, warnFile, diagFile)
# Internal state - accumulators for different inner block text
self.sections = dict([(section, []) for section in self.ALL_SECTIONS])
#
def beginFile(self, genOpts):
OutputGenerator.beginFile(self, genOpts)
# C-specific
#
# Multiple inclusion protection & C++ wrappers.
if (genOpts.protectFile and self.genOpts.filename):
headerSym = re.sub('\.h', '_h_',
os.path.basename(self.genOpts.filename)).upper()
write('#ifndef', headerSym, file=self.outFile)
write('#define', headerSym, '1', file=self.outFile)
self.newline()
write('#ifdef __cplusplus', file=self.outFile)
write('extern "C" {', file=self.outFile)
write('#endif', file=self.outFile)
self.newline()
#
# User-supplied prefix text, if any (list of strings)
if (genOpts.prefixText):
for s in genOpts.prefixText:
write(s, file=self.outFile)
#
# Some boilerplate describing what was generated - this
# will probably be removed later since the extensions
# pattern may be very long.
# write('/* Generated C header for:', file=self.outFile)
# write(' * API:', genOpts.apiname, file=self.outFile)
# if (genOpts.profile):
# write(' * Profile:', genOpts.profile, file=self.outFile)
# write(' * Versions considered:', genOpts.versions, file=self.outFile)
# write(' * Versions emitted:', genOpts.emitversions, file=self.outFile)
# write(' * Default extensions included:', genOpts.defaultExtensions, file=self.outFile)
# write(' * Additional extensions included:', genOpts.addExtensions, file=self.outFile)
# write(' * Extensions removed:', genOpts.removeExtensions, file=self.outFile)
# write(' * Extensions emitted:', genOpts.emitExtensions, file=self.outFile)
# write(' */', file=self.outFile)
def endFile(self):
# C-specific
# Finish C++ wrapper and multiple inclusion protection
self.newline()
write('#ifdef __cplusplus', file=self.outFile)
write('}', file=self.outFile)
write('#endif', file=self.outFile)
if (self.genOpts.protectFile and self.genOpts.filename):
self.newline()
write('#endif', file=self.outFile)
# Finish processing in superclass
OutputGenerator.endFile(self)
def beginFeature(self, interface, emit):
# Start processing in superclass
OutputGenerator.beginFeature(self, interface, emit)
# C-specific
# Accumulate includes, defines, types, enums, function pointer typedefs,
# end function prototypes separately for this feature. They're only
# printed in endFeature().
self.sections = dict([(section, []) for section in self.ALL_SECTIONS])
def endFeature(self):
# C-specific
# Actually write the interface to the output file.
if (self.emit):
self.newline()
if (self.genOpts.protectFeature):
write('#ifndef', self.featureName, file=self.outFile)
# If type declarations are needed by other features based on
# this one, it may be necessary to suppress the ExtraProtect,
# or move it below the 'for section...' loop.
if (self.featureExtraProtect != None):
write('#ifdef', self.featureExtraProtect, file=self.outFile)
write('#define', self.featureName, '1', file=self.outFile)
for section in self.TYPE_SECTIONS:
contents = self.sections[section]
if contents:
write('\n'.join(contents), file=self.outFile)
self.newline()
if (self.genOpts.genFuncPointers and self.sections['commandPointer']):
write('\n'.join(self.sections['commandPointer']), file=self.outFile)
self.newline()
if (self.sections['command']):
if (self.genOpts.protectProto):
write(self.genOpts.protectProto,
self.genOpts.protectProtoStr, file=self.outFile)
write('\n'.join(self.sections['command']), end='', file=self.outFile)
if (self.genOpts.protectProto):
write('#endif', file=self.outFile)
else:
self.newline()
if (self.featureExtraProtect != None):
write('#endif /*', self.featureExtraProtect, '*/', file=self.outFile)
if (self.genOpts.protectFeature):
write('#endif /*', self.featureName, '*/', file=self.outFile)
# Finish processing in superclass
OutputGenerator.endFeature(self)
#
# Append a definition to the specified section
def appendSection(self, section, text):
# self.sections[section].append('SECTION: ' + section + '\n')
self.sections[section].append(text)
# self.logMsg('diag', 'appendSection(section =', section, 'text =', text)
#
# Type generation
def genType(self, typeinfo, name, alias):
OutputGenerator.genType(self, typeinfo, name, alias)
typeElem = typeinfo.elem
# Determine the category of the type, and the type section to add
# its definition to.
# 'funcpointer' is added to the 'struct' section as a workaround for
# internal issue #877, since structures and function pointer types
# can have cross-dependencies.
category = typeElem.get('category')
if category == 'funcpointer':
section = 'struct'
else:
section = category
if category == 'struct' or category == 'union':
# If the type is a struct type, generate it using the
# special-purpose generator.
self.genStruct(typeinfo, name, alias)
else:
if alias:
# If the type is an alias, just emit a typedef declaration
body = 'typedef ' + alias + ' ' + name + ';\n'
else:
# Replace <apientry /> tags with an APIENTRY-style string
# (from self.genOpts). Copy other text through unchanged.
# If the resulting text is an empty string, don't emit it.
body = noneStr(typeElem.text)
for elem in typeElem:
if (elem.tag == 'apientry'):
body += self.genOpts.apientry + noneStr(elem.tail)
else:
body += noneStr(elem.text) + noneStr(elem.tail)
if body:
# Add extra newline after multi-line entries.
if '\n' in body[0:-1]:
body += '\n'
self.appendSection(section, body)
#
# Struct (e.g. C "struct" type) generation.
# This is a special case of the <type> tag where the contents are
# interpreted as a set of <member> tags instead of freeform C
# C type declarations. The <member> tags are just like <param>
# tags - they are a declaration of a struct or union member.
# Only simple member declarations are supported (no nested
# structs etc.)
# If alias != None, then this struct aliases another; just
# generate a typedef of that alias.
def genStruct(self, typeinfo, typeName, alias):
OutputGenerator.genStruct(self, typeinfo, typeName, alias)
typeElem = typeinfo.elem
if alias:
body = 'typedef ' + alias + ' ' + typeName + ';\n'
else:
body = 'typedef ' + typeElem.get('category') + ' ' + typeName + ' {\n'
targetLen = 0;
for member in typeElem.findall('.//member'):
targetLen = max(targetLen, self.getCParamTypeLength(member))
for member in typeElem.findall('.//member'):
body += self.makeCParamDecl(member, targetLen + 4)
body += ';\n'
body += '} ' + typeName + ';\n'
self.appendSection('struct', body)
#
# Group (e.g. C "enum" type) generation.
# These are concatenated together with other types.
# If alias != None, it is the name of another group type
# which aliases this type; just generate that alias.
def genGroup(self, groupinfo, groupName, alias = None):
OutputGenerator.genGroup(self, groupinfo, groupName, alias)
groupElem = groupinfo.elem
if alias:
# If the group name is aliased, just emit a typedef declaration
# for the alias.
body = 'typedef ' + alias + ' ' + groupName + ';\n'
else:
self.logMsg('diag', 'CGenerator.genGroup group =', groupName, 'alias =', alias)
# Otherwise, emit an actual enumerated type declaration
expandName = re.sub(r'([0-9a-z_])([A-Z0-9])',r'\1_\2',groupName).upper()
expandPrefix = expandName
expandSuffix = ''
expandSuffixMatch = re.search(r'[A-Z][A-Z]+$',groupName)
if expandSuffixMatch:
expandSuffix = '_' + expandSuffixMatch.group()
# Strip off the suffix from the prefix
expandPrefix = expandName.rsplit(expandSuffix, 1)[0]
# Prefix
body = "\ntypedef enum " + groupName + " {\n"
# @@ Should use the type="bitmask" attribute instead
isEnum = ('FLAG_BITS' not in expandPrefix)
# Get a list of nested 'enum' tags.
enums = groupElem.findall('enum')
# Check for and report duplicates, and return a list with them
# removed.
enums = self.checkDuplicateEnums(enums)
# Loop over the nested 'enum' tags. Keep track of the minimum and
# maximum numeric values, if they can be determined; but only for
# core API enumerants, not extension enumerants. This is inferred
# by looking for 'extends' attributes.
minName = None
# Accumulate non-numeric enumerant values separately and append
# them following the numeric values, to allow for aliases.
# NOTE: this doesn't do a topological sort yet, so aliases of
# aliases can still get in the wrong order.
aliasText = ""
for elem in enums:
# Convert the value to an integer and use that to track min/max.
(numVal,strVal) = self.enumToValue(elem, True)
name = elem.get('name')
# Extension enumerants are only included if they are required
if self.isEnumRequired(elem):
decl = " " + name + " = " + strVal + ",\n"
if numVal != None:
body += decl
else:
aliasText += decl
# Don't track min/max for non-numbers (numVal == None)
if isEnum and numVal != None and elem.get('extends') is None:
if minName == None:
minName = maxName = name
minValue = maxValue = numVal
elif numVal < minValue:
minName = name
minValue = numVal
elif numVal > maxValue:
maxName = name
maxValue = numVal
# Now append the non-numeric enumerant values
body += aliasText
# Generate min/max value tokens and a range-padding enum. Need some
# additional padding to generate correct names...
if isEnum:
body += " " + expandPrefix + "_BEGIN_RANGE" + expandSuffix + " = " + minName + ",\n"
body += " " + expandPrefix + "_END_RANGE" + expandSuffix + " = " + maxName + ",\n"
body += " " + expandPrefix + "_RANGE_SIZE" + expandSuffix + " = (" + maxName + " - " + minName + " + 1),\n"
body += " " + expandPrefix + "_MAX_ENUM" + expandSuffix + " = 0x7FFFFFFF\n"
# Postfix
body += "} " + groupName + ";"
# After either enumerated type or alias paths, add the declaration
# to the appropriate section for the group being defined.
if groupElem.get('type') == 'bitmask':
section = 'bitmask'
else:
section = 'group'
self.appendSection(section, body)
# Enumerant generation
# <enum> tags may specify their values in several ways, but are usually
# just integers.
def genEnum(self, enuminfo, name, alias):
OutputGenerator.genEnum(self, enuminfo, name, alias)
(numVal,strVal) = self.enumToValue(enuminfo.elem, False)
body = '#define ' + name.ljust(33) + ' ' + strVal
self.appendSection('enum', body)
#
# Command generation
def genCmd(self, cmdinfo, name, alias):
OutputGenerator.genCmd(self, cmdinfo, name, alias)
# if alias:
# prefix = '// ' + name + ' is an alias of command ' + alias + '\n'
# else:
# prefix = ''
prefix = ''
decls = self.makeCDecls(cmdinfo.elem)
self.appendSection('command', prefix + decls[0] + '\n')
if (self.genOpts.genFuncPointers):
self.appendSection('commandPointer', decls[1])