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186 lines
6.0 KiB
186 lines
6.0 KiB
#!/usr/bin/env python
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# Copyright (c) 2017 Google Inc.
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Generates language headers from a JSON grammar file"""
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import errno
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import json
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import os.path
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import re
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def make_path_to_file(f):
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"""Makes all ancestor directories to the given file, if they
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don't yet exist.
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Arguments:
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f: The file whose ancestor directories are to be created.
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"""
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dir = os.path.dirname(os.path.abspath(f))
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try:
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os.makedirs(dir)
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except OSError as e:
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if e.errno == errno.EEXIST and os.path.isdir(dir):
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pass
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else:
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raise
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class ExtInstGrammar:
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"""The grammar for an extended instruction set"""
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def __init__(self, name, copyright, instructions, operand_kinds, version = None, revision = None):
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self.name = name
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self.copyright = copyright
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self.instructions = instructions
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self.operand_kinds = operand_kinds
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self.version = version
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self.revision = revision
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class LangGenerator:
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"""A language-specific generator"""
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def __init__(self):
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self.upper_case_initial = re.compile('^[A-Z]')
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pass
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def comment_prefix(self):
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return ""
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def namespace_prefix(self):
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return ""
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def uses_guards(self):
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return False
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def cpp_guard_preamble(self):
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return ""
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def cpp_guard_postamble(self):
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return ""
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def enum_value(self, prefix, name, value):
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if self.upper_case_initial.match(name):
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use_name = name
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else:
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use_name = '_' + name
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return " {}{} = {},".format(prefix, use_name, value)
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def generate(self, grammar):
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"""Returns a string that is the language-specific header for the given grammar"""
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parts = []
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if grammar.copyright:
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parts.extend(["{}{}".format(self.comment_prefix(), f) for f in grammar.copyright])
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parts.append('')
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guard = 'SPIRV_EXTINST_{}_H_'.format(grammar.name)
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if self.uses_guards:
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parts.append('#ifndef {}'.format(guard))
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parts.append('#define {}'.format(guard))
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parts.append('')
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parts.append(self.cpp_guard_preamble())
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if grammar.version:
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parts.append(self.const_definition(grammar.name, 'Version', grammar.version))
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if grammar.revision is not None:
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parts.append(self.const_definition(grammar.name, 'Revision', grammar.revision))
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parts.append('')
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if grammar.instructions:
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parts.append(self.enum_prefix(grammar.name, 'Instructions'))
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for inst in grammar.instructions:
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parts.append(self.enum_value(grammar.name, inst['opname'], inst['opcode']))
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parts.append(self.enum_end(grammar.name, 'Instructions'))
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parts.append('')
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if grammar.operand_kinds:
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for kind in grammar.operand_kinds:
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parts.append(self.enum_prefix(grammar.name, kind['kind']))
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for e in kind['enumerants']:
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parts.append(self.enum_value(grammar.name, e['enumerant'], e['value']))
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parts.append(self.enum_end(grammar.name, kind['kind']))
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parts.append('')
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parts.append(self.cpp_guard_postamble())
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if self.uses_guards:
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parts.append('#endif // {}'.format(guard))
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return '\n'.join(parts)
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class CLikeGenerator(LangGenerator):
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def uses_guards(self):
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return True
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def comment_prefix(self):
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return "// "
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def const_definition(self, prefix, var, value):
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# Use an anonymous enum. Don't use a static const int variable because
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# that can bloat binary size.
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return 'enum {0} {1}{2} = {3}, {1}{2}_BitWidthPadding = 0x7fffffff {4};'.format(
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'{', prefix, var, value, '}')
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def enum_prefix(self, prefix, name):
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return 'enum {}{} {}'.format(prefix, name, '{')
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def enum_end(self, prefix, enum):
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return ' {}{}Max = 0x7ffffff\n{};\n'.format(prefix, enum, '}')
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def cpp_guard_preamble(self):
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return '#ifdef __cplusplus\nextern "C" {\n#endif\n'
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def cpp_guard_postamble(self):
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return '#ifdef __cplusplus\n}\n#endif\n'
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class CGenerator(CLikeGenerator):
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pass
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def main():
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import argparse
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parser = argparse.ArgumentParser(description='Generate language headers from a JSON grammar')
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parser.add_argument('--extinst-grammar', metavar='<path>',
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type=str, required=True,
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help='input JSON grammar file for extended instruction set')
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parser.add_argument('--extinst-output-path', metavar='<path>',
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type=str, required=True,
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help='Path of the language-specific output file.')
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args = parser.parse_args()
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with open(args.extinst_grammar) as json_file:
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grammar_json = json.loads(json_file.read())
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grammar_name = os.path.splitext(os.path.basename(args.extinst_output_path))[0]
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grammar = ExtInstGrammar(name = grammar_name,
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copyright = grammar_json['copyright'],
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instructions = grammar_json['instructions'],
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operand_kinds = grammar_json['operand_kinds'],
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version = grammar_json['version'],
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revision = grammar_json['revision'])
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make_path_to_file(args.extinst_output_path)
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with open(args.extinst_output_path, 'w') as f:
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f.write(CGenerator().generate(grammar))
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if __name__ == '__main__':
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main()
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