405 lines
18 KiB
Python
Executable file
405 lines
18 KiB
Python
Executable file
#!/usr/bin/python3 -i
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#
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# Copyright (c) 2013-2020 The Khronos Group Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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import os
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import re
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from generator import (GeneratorOptions, OutputGenerator, noneStr,
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regSortFeatures, write)
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class CGeneratorOptions(GeneratorOptions):
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"""CGeneratorOptions - subclass of GeneratorOptions.
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Adds options used by COutputGenerator objects during C language header
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generation."""
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def __init__(self,
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prefixText="",
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genFuncPointers=True,
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protectFile=True,
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protectFeature=True,
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protectProto=None,
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protectProtoStr=None,
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apicall='',
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apientry='',
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apientryp='',
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indentFuncProto=True,
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indentFuncPointer=False,
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alignFuncParam=0,
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genEnumBeginEndRange=False,
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genAliasMacro=False,
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aliasMacro='',
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**kwargs
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):
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"""Constructor.
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Additional parameters beyond parent class:
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- prefixText - list of strings to prefix generated header with
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(usually a copyright statement + calling convention macros).
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- protectFile - True if multiple inclusion protection should be
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generated (based on the filename) around the entire header.
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- protectFeature - True if #ifndef..#endif protection should be
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generated around a feature interface in the header file.
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- genFuncPointers - True if function pointer typedefs should be
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generated
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- protectProto - If conditional protection should be generated
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around prototype declarations, set to either '#ifdef'
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to require opt-in (#ifdef protectProtoStr) or '#ifndef'
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to require opt-out (#ifndef protectProtoStr). Otherwise
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set to None.
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- protectProtoStr - #ifdef/#ifndef symbol to use around prototype
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declarations, if protectProto is set
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- apicall - string to use for the function declaration prefix,
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such as APICALL on Windows.
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- apientry - string to use for the calling convention macro,
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in typedefs, such as APIENTRY.
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- apientryp - string to use for the calling convention macro
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in function pointer typedefs, such as APIENTRYP.
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- indentFuncProto - True if prototype declarations should put each
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parameter on a separate line
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- indentFuncPointer - True if typedefed function pointers should put each
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parameter on a separate line
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- alignFuncParam - if nonzero and parameters are being put on a
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separate line, align parameter names at the specified column
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- genEnumBeginEndRange - True if BEGIN_RANGE / END_RANGE macros should
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be generated for enumerated types
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- genAliasMacro - True if the OpenXR alias macro should be generated
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for aliased types (unclear what other circumstances this is useful)
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- aliasMacro - alias macro to inject when genAliasMacro is True"""
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GeneratorOptions.__init__(self, **kwargs)
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self.prefixText = prefixText
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"""list of strings to prefix generated header with (usually a copyright statement + calling convention macros)."""
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self.genFuncPointers = genFuncPointers
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"""True if function pointer typedefs should be generated"""
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self.protectFile = protectFile
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"""True if multiple inclusion protection should be generated (based on the filename) around the entire header."""
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self.protectFeature = protectFeature
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"""True if #ifndef..#endif protection should be generated around a feature interface in the header file."""
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self.protectProto = protectProto
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"""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."""
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self.protectProtoStr = protectProtoStr
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"""#ifdef/#ifndef symbol to use around prototype declarations, if protectProto is set"""
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self.apicall = apicall
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"""string to use for the function declaration prefix, such as APICALL on Windows."""
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self.apientry = apientry
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"""string to use for the calling convention macro, in typedefs, such as APIENTRY."""
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self.apientryp = apientryp
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"""string to use for the calling convention macro in function pointer typedefs, such as APIENTRYP."""
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self.indentFuncProto = indentFuncProto
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"""True if prototype declarations should put each parameter on a separate line"""
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self.indentFuncPointer = indentFuncPointer
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"""True if typedefed function pointers should put each parameter on a separate line"""
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self.alignFuncParam = alignFuncParam
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"""if nonzero and parameters are being put on a separate line, align parameter names at the specified column"""
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self.genEnumBeginEndRange = genEnumBeginEndRange
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"""True if BEGIN_RANGE / END_RANGE macros should be generated for enumerated types"""
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self.genAliasMacro = genAliasMacro
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"""True if the OpenXR alias macro should be generated for aliased types (unclear what other circumstances this is useful)"""
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self.aliasMacro = aliasMacro
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"""alias macro to inject when genAliasMacro is True"""
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self.codeGenerator = True
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"""True if this generator makes compilable code"""
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class COutputGenerator(OutputGenerator):
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"""Generates C-language API interfaces."""
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# This is an ordered list of sections in the header file.
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TYPE_SECTIONS = ['include', 'define', 'basetype', 'handle', 'enum',
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'group', 'bitmask', 'funcpointer', 'struct']
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ALL_SECTIONS = TYPE_SECTIONS + ['commandPointer', 'command']
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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# Internal state - accumulators for different inner block text
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self.sections = {section: [] for section in self.ALL_SECTIONS}
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self.feature_not_empty = False
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self.may_alias = None
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def beginFile(self, genOpts):
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OutputGenerator.beginFile(self, genOpts)
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# C-specific
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#
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# Multiple inclusion protection & C++ wrappers.
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if genOpts.protectFile and self.genOpts.filename:
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headerSym = re.sub(r'\.h', '_h_',
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os.path.basename(self.genOpts.filename)).upper()
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write('#ifndef', headerSym, file=self.outFile)
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write('#define', headerSym, '1', file=self.outFile)
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self.newline()
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# User-supplied prefix text, if any (list of strings)
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if genOpts.prefixText:
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for s in genOpts.prefixText:
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write(s, file=self.outFile)
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# C++ extern wrapper - after prefix lines so they can add includes.
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self.newline()
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write('#ifdef __cplusplus', file=self.outFile)
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write('extern "C" {', file=self.outFile)
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write('#endif', file=self.outFile)
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self.newline()
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def endFile(self):
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# C-specific
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# Finish C++ wrapper and multiple inclusion protection
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self.newline()
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write('#ifdef __cplusplus', file=self.outFile)
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write('}', file=self.outFile)
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write('#endif', file=self.outFile)
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if self.genOpts.protectFile and self.genOpts.filename:
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self.newline()
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write('#endif', file=self.outFile)
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# Finish processing in superclass
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OutputGenerator.endFile(self)
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def beginFeature(self, interface, emit):
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# Start processing in superclass
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OutputGenerator.beginFeature(self, interface, emit)
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# C-specific
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# Accumulate includes, defines, types, enums, function pointer typedefs,
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# end function prototypes separately for this feature. They're only
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# printed in endFeature().
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self.sections = {section: [] for section in self.ALL_SECTIONS}
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self.feature_not_empty = False
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def endFeature(self):
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"Actually write the interface to the output file."
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# C-specific
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if self.emit:
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if self.feature_not_empty:
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if self.genOpts.conventions.writeFeature(self.featureExtraProtect, self.genOpts.filename):
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self.newline()
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if self.genOpts.protectFeature:
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write('#ifndef', self.featureName, file=self.outFile)
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# If type declarations are needed by other features based on
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# this one, it may be necessary to suppress the ExtraProtect,
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# or move it below the 'for section...' loop.
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if self.featureExtraProtect is not None:
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write('#ifdef', self.featureExtraProtect, file=self.outFile)
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self.newline()
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write('#define', self.featureName, '1', file=self.outFile)
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for section in self.TYPE_SECTIONS:
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contents = self.sections[section]
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if contents:
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write('\n'.join(contents), file=self.outFile)
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if self.genOpts.genFuncPointers and self.sections['commandPointer']:
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write('\n'.join(self.sections['commandPointer']), file=self.outFile)
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self.newline()
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if self.sections['command']:
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if self.genOpts.protectProto:
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write(self.genOpts.protectProto,
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self.genOpts.protectProtoStr, file=self.outFile)
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write('\n'.join(self.sections['command']), end='', file=self.outFile)
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if self.genOpts.protectProto:
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write('#endif', file=self.outFile)
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else:
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self.newline()
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if self.featureExtraProtect is not None:
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write('#endif /*', self.featureExtraProtect, '*/', file=self.outFile)
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if self.genOpts.protectFeature:
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write('#endif /*', self.featureName, '*/', file=self.outFile)
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# Finish processing in superclass
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OutputGenerator.endFeature(self)
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def appendSection(self, section, text):
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"Append a definition to the specified section"
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# self.sections[section].append('SECTION: ' + section + '\n')
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self.sections[section].append(text)
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self.feature_not_empty = True
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def genType(self, typeinfo, name, alias):
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"Generate type."
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OutputGenerator.genType(self, typeinfo, name, alias)
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typeElem = typeinfo.elem
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# Vulkan:
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# Determine the category of the type, and the type section to add
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# its definition to.
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# 'funcpointer' is added to the 'struct' section as a workaround for
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# internal issue #877, since structures and function pointer types
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# can have cross-dependencies.
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category = typeElem.get('category')
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if category == 'funcpointer':
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section = 'struct'
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else:
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section = category
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if category in ('struct', 'union'):
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# If the type is a struct type, generate it using the
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# special-purpose generator.
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self.genStruct(typeinfo, name, alias)
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else:
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# OpenXR: this section was not under 'else:' previously, just fell through
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if alias:
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# If the type is an alias, just emit a typedef declaration
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body = 'typedef ' + alias + ' ' + name + ';\n'
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else:
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# Replace <apientry /> tags with an APIENTRY-style string
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# (from self.genOpts). Copy other text through unchanged.
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# If the resulting text is an empty string, don't emit it.
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body = noneStr(typeElem.text)
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for elem in typeElem:
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if elem.tag == 'apientry':
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body += self.genOpts.apientry + noneStr(elem.tail)
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else:
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body += noneStr(elem.text) + noneStr(elem.tail)
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if body:
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# Add extra newline after multi-line entries.
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if '\n' in body[0:-1]:
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body += '\n'
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self.appendSection(section, body)
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def genProtectString(self, protect_str):
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"""Generate protection string.
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Protection strings are the strings defining the OS/Platform/Graphics
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requirements for a given OpenXR command. When generating the
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language header files, we need to make sure the items specific to a
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graphics API or OS platform are properly wrapped in #ifs."""
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protect_if_str = ''
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protect_end_str = ''
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if not protect_str:
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return (protect_if_str, protect_end_str)
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if ',' in protect_str:
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protect_list = protect_str.split(",")
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protect_defs = ('defined(%s)' % d for d in protect_list)
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protect_def_str = ' && '.join(protect_defs)
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protect_if_str = '#if %s\n' % protect_def_str
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protect_end_str = '#endif // %s\n' % protect_def_str
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else:
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protect_if_str = '#ifdef %s\n' % protect_str
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protect_end_str = '#endif // %s\n' % protect_str
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return (protect_if_str, protect_end_str)
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def typeMayAlias(self, typeName):
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if not self.may_alias:
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# First time we've asked if a type may alias.
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# So, let's populate the set of all names of types that may.
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# Everyone with an explicit mayalias="true"
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self.may_alias = set(typeName
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for typeName, data in self.registry.typedict.items()
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if data.elem.get('mayalias') == 'true')
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# Every type mentioned in some other type's parentstruct attribute.
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parent_structs = (otherType.elem.get('parentstruct')
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for otherType in self.registry.typedict.values())
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self.may_alias.update(set(x for x in parent_structs
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if x is not None))
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return typeName in self.may_alias
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def genStruct(self, typeinfo, typeName, alias):
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"""Generate struct (e.g. C "struct" type).
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This is a special case of the <type> tag where the contents are
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interpreted as a set of <member> tags instead of freeform C
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C type declarations. The <member> tags are just like <param>
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tags - they are a declaration of a struct or union member.
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Only simple member declarations are supported (no nested
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structs etc.)
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If alias is not None, then this struct aliases another; just
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generate a typedef of that alias."""
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OutputGenerator.genStruct(self, typeinfo, typeName, alias)
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typeElem = typeinfo.elem
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if alias:
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body = 'typedef ' + alias + ' ' + typeName + ';\n'
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else:
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body = ''
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(protect_begin, protect_end) = self.genProtectString(typeElem.get('protect'))
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if protect_begin:
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body += protect_begin
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body += 'typedef ' + typeElem.get('category')
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# This is an OpenXR-specific alternative where aliasing refers
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# to an inheritance hierarchy of types rather than C-level type
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# aliases.
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if self.genOpts.genAliasMacro and self.typeMayAlias(typeName):
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body += ' ' + self.genOpts.aliasMacro
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body += ' ' + typeName + ' {\n'
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targetLen = self.getMaxCParamTypeLength(typeinfo)
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for member in typeElem.findall('.//member'):
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body += self.makeCParamDecl(member, targetLen + 4)
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body += ';\n'
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body += '} ' + typeName + ';\n'
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if protect_end:
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body += protect_end
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self.appendSection('struct', body)
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def genGroup(self, groupinfo, groupName, alias=None):
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"""Generate groups (e.g. C "enum" type).
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These are concatenated together with other types.
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If alias is not None, it is the name of another group type
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which aliases this type; just generate that alias."""
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OutputGenerator.genGroup(self, groupinfo, groupName, alias)
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groupElem = groupinfo.elem
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# After either enumerated type or alias paths, add the declaration
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# to the appropriate section for the group being defined.
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if groupElem.get('type') == 'bitmask':
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section = 'bitmask'
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else:
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section = 'group'
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if alias:
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# If the group name is aliased, just emit a typedef declaration
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# for the alias.
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body = 'typedef ' + alias + ' ' + groupName + ';\n'
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self.appendSection(section, body)
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else:
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(section, body) = self.buildEnumCDecl(self.genOpts.genEnumBeginEndRange, groupinfo, groupName)
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self.appendSection(section, "\n" + body)
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def genEnum(self, enuminfo, name, alias):
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"""Generate enumerants.
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<enum> tags may specify their values in several ways, but are usually
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just integers."""
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OutputGenerator.genEnum(self, enuminfo, name, alias)
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(_, strVal) = self.enumToValue(enuminfo.elem, False)
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body = '#define ' + name.ljust(33) + ' ' + strVal
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self.appendSection('enum', body)
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def genCmd(self, cmdinfo, name, alias):
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"Command generation"
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OutputGenerator.genCmd(self, cmdinfo, name, alias)
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# if alias:
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# prefix = '// ' + name + ' is an alias of command ' + alias + '\n'
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# else:
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# prefix = ''
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prefix = ''
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decls = self.makeCDecls(cmdinfo.elem)
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self.appendSection('command', prefix + decls[0] + '\n')
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if self.genOpts.genFuncPointers:
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self.appendSection('commandPointer', decls[1])
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