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https://github.com/X11Libre/xserver.git
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829bfb392f
Automatically generate extension marshal glue code like the infamous SProc*()'s for byte swapping, dispatch functions, etc, based on a tiny yaml discription. Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
105 lines
3.1 KiB
Python
Executable File
105 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# generator for extension marshal glue code
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#
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import sys
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import yaml
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def fixup_reqspec(reqname, reqspec):
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if not 'name' in reqspec:
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reqspec['name'] = reqname
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if not 'sproc' in reqspec:
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reqspec['sproc'] = "SProc%s" % reqspec['name']
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if not 'proc' in reqspec:
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reqspec['proc'] = "Proc%s" % reqspec['name']
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if not 'struct' in reqspec:
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reqspec['struct'] = "x%sReq" % reqspec['name']
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if not 'code' in reqspec:
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reqspec['code'] = "X_%s" % reqspec['name']
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return reqspec
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def gen_sproc(reqspec):
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txt = ("static int _X_COLD %s(ClientPtr client)\n" % reqspec['sproc'] +
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"{\n" +
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" REQUEST(%s);\n\n" % reqspec['struct'] +
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" swaps(&stuff->length);\n")
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if 'payload' in reqspec and reqspec['payload'] is not None:
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for pl in reqspec['payload']:
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if pl['type'] == "CARD8":
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# nothing to do
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pass
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elif pl['type'] == "CARD16":
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txt = txt + " swaps(&stuff->%s);\n" % pl['name']
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elif pl['type'] == "CARD32":
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txt = txt + " swapl(&stuff->%s);\n" % pl['name']
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else:
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raise Exception("unknown payload type %s in %s field of %s" % (pl['type'], pl['name'], reqspec['name']))
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txt = (txt + " return %s(client);\n" % reqspec['proc']
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+ "}\n\n")
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return txt
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def gen_sdispatch(spec):
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procname = "SProc%sDispatch" % spec['extension']
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txt = ("static int _X_COLD %s(ClientPtr client)\n" % procname +
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"{\n" +
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" REQUEST(xReq);\n" +
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" switch (stuff->data) {\n")
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for rname in spec['requests']:
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rspec = fixup_reqspec(rname, spec['requests'][rname])
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txt = txt + " case %s:\n" % rspec['code']
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txt = txt + " return %s(client);\n" % rspec['sproc']
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return txt + (
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" default:\n" +
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" return BadRequest;\n" +
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" }\n" +
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"}\n")
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def gen_dispatch(spec):
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procname = "Proc%sDispatch" % spec['extension']
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txt = ("static int _X_COLD %s(ClientPtr client)\n" % procname +
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"{\n" +
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" REQUEST(xReq);\n" +
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" switch (stuff->data) {\n")
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for rname in spec['requests']:
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rspec = fixup_reqspec(rname, spec['requests'][rname])
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txt = txt + " case %s:\n" % rspec['code']
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txt = txt + " REQUEST_SIZE_MATCH(%s);\n" % rspec['struct']
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txt = txt + " return %s(client);\n" % rspec['sproc']
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return txt + (
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" default:\n" +
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" return BadRequest;\n" +
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" }\n" +
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"}\n")
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def gen_include(specfile, outfile):
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print("%s: in=%s out=%s" % (sys.argv[0], specfile, outfile))
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with open(specfile, 'r') as f:
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spec = yaml.safe_load(f)
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outf = open(outfile, "w")
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requests = spec['requests']
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for rname in requests:
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rspec = fixup_reqspec(rname, requests[rname])
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outf.write(gen_sproc(rspec))
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outf.write(gen_sdispatch(spec))
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outf.write(gen_dispatch(spec))
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outf.close()
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gen_include(sys.argv[1], sys.argv[2])
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