gecko/dom/bindings/BindingGen.py

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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http://mozilla.org/MPL/2.0/.
import os
import cPickle
from Configuration import Configuration
from Codegen import CGBindingRoot, replaceFileIfChanged, CGEventRoot
from mozbuild.makeutil import Makefile
from mozbuild.pythonutil import iter_modules_in_path
from buildconfig import topsrcdir
def generate_binding_files(config, outputprefix, srcprefix, webidlfile,
generatedEventsWebIDLFiles):
"""
|config| Is the configuration object.
|outputprefix| is a prefix to use for the header guards and filename.
"""
depsname = ".deps/" + outputprefix + ".pp"
root = CGBindingRoot(config, outputprefix, webidlfile)
replaceFileIfChanged(outputprefix + ".h", root.declare())
replaceFileIfChanged(outputprefix + ".cpp", root.define())
if webidlfile in generatedEventsWebIDLFiles:
eventName = webidlfile[:-len(".webidl")]
generatedEvent = CGEventRoot(config, eventName)
replaceFileIfChanged(eventName + ".h", generatedEvent.declare())
replaceFileIfChanged(eventName + ".cpp", generatedEvent.define())
mk = Makefile()
# NOTE: it's VERY important that we output dependencies for the FooBinding
# file here, not for the header or generated cpp file. These dependencies
# are used later to properly determine changedDeps and prevent rebuilding
# too much. See the comment explaining $(binding_dependency_trackers) in
# Makefile.in.
rule = mk.create_rule([outputprefix])
rule.add_dependencies(os.path.join(srcprefix, x) for x in sorted(root.deps()))
rule.add_dependencies(iter_modules_in_path(topsrcdir))
with open(depsname, 'w') as f:
mk.dump(f)
def main():
# Parse arguments.
from optparse import OptionParser
usagestring = "usage: %prog [header|cpp] configFile outputPrefix srcPrefix webIDLFile"
o = OptionParser(usage=usagestring)
o.add_option("--verbose-errors", action='store_true', default=False,
help="When an error happens, display the Python traceback.")
(options, args) = o.parse_args()
configFile = os.path.normpath(args[0])
srcPrefix = os.path.normpath(args[1])
# Load the configuration
f = open('ParserResults.pkl', 'rb')
config = cPickle.load(f)
f.close()
def readFile(f):
file = open(f, 'rb')
try:
contents = file.read()
finally:
file.close()
return contents
allWebIDLFiles = readFile(args[2]).split()
generatedEventsWebIDLFiles = readFile(args[3]).split()
changedDeps = readFile(args[4]).split()
if all(f.endswith("Binding") or f == "ParserResults.pkl" for f in changedDeps):
toRegenerate = filter(lambda f: f.endswith("Binding"), changedDeps)
if len(toRegenerate) == 0 and len(changedDeps) == 1:
# Work around build system bug 874923: if we get here that means
# that changedDeps contained only one entry and it was
# "ParserResults.pkl". That should never happen: if the
# ParserResults.pkl changes then either one of the globalgen files
# changed (in which case we wouldn't be in this "only
# ParserResults.pkl and *Binding changed" code) or some .webidl
# files changed (and then the corresponding *Binding files should
# show up in changedDeps). Since clearly the build system is
# confused, just regenerate everything to be safe.
toRegenerate = allWebIDLFiles
else:
toRegenerate = map(lambda f: f[:-len("Binding")] + ".webidl",
toRegenerate)
else:
toRegenerate = allWebIDLFiles
for webIDLFile in toRegenerate:
assert webIDLFile.endswith(".webidl")
outputPrefix = webIDLFile[:-len(".webidl")] + "Binding"
generate_binding_files(config, outputPrefix, srcPrefix, webIDLFile,
generatedEventsWebIDLFiles);
if __name__ == '__main__':
main()