build_tools/debugflaghh.py

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import argparse
import sys

from code_formatter import code_formatter

parser = argparse.ArgumentParser()
parser.add_argument("hh", help="the path of the debug flag header file")
parser.add_argument("name", help="the name of the debug flag")
parser.add_argument("desc", help="a description of the debug flag")
parser.add_argument("fmt",
        help="whether the flag is a format flag (True or False)")
parser.add_argument("components",
        help="components of a compound flag, if applicable, joined with :")

args = parser.parse_args()

fmt = args.fmt.lower()
if fmt == 'true':
    fmt = True
elif fmt == 'false':
    fmt = False
else:
    print(f'Unrecognized "FMT" value {fmt}', file=sys.stderr)
    sys.exit(1)
components = args.components.split(':') if args.components else []

code = code_formatter()

code('''
#ifndef __DEBUG_${{args.name}}_HH__
#define __DEBUG_${{args.name}}_HH__

#include "base/compiler.hh" // For namespace deprecation
#include "base/debug.hh"
''')
for flag in components:
    code('#include "debug/${flag}.hh"')
code('''
namespace gem5
{

GEM5_DEPRECATED_NAMESPACE(Debug, debug);
namespace debug
{

namespace unions
{
''')

# Use unions to prevent debug flags from being destructed. It's the
# responsibility of the programmer to handle object destruction for members
# of the union. We purposefully leave that destructor empty so that we can
# use debug flags even in the destructors of other objects.
if components:
    code('''
inline union ${{args.name}}
{
    ~${{args.name}}() {}
    CompoundFlag ${{args.name}} = {
        "${{args.name}}", "${{args.desc}}", {
            ${{",\\n            ".join(
                f"(Flag *)&::gem5::debug::{flag}" for flag in components)}}
        }
    };
} ${{args.name}};
''')
else:
    code('''
inline union ${{args.name}}
{
    ~${{args.name}}() {}
    SimpleFlag ${{args.name}} = {
        "${{args.name}}", "${{args.desc}}", ${{"true" if fmt else "false"}}
    };
} ${{args.name}};
''')

code('''
} // namespace unions

inline constexpr const auto& ${{args.name}} = 
    ::gem5::debug::unions::${{args.name}}.${{args.name}};

} // namespace debug
} // namespace gem5

#endif // __DEBUG_${{args.name}}_HH__
''')

code.write(args.hh)