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command: Support evaluating C expressions in DECL_CONSTANT()

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-03-04 23:24:43 -05:00 • committed by KevinOConnor
parent b28e95ca1a
commit 7d73a35805
3 changed files with 41 additions and 15 deletions
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25
scripts/buildcommands.py
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@ -101,19 +101,36 @@ Handlers.append(HandleStaticStrings())
# Constants
######################################################################
def decode_integer(value):
value = value.strip()
if len(value) != 7 or value[0] not in '-+':
error("Invalid encoded integer '%s'" % (value,))
out = sum([(ord(c) - 48) << (i*6) for i, c in enumerate(value[1:])])
if value[0] == '-':
out -= 1<<32
return out
# Allow adding build time constants to the data dictionary
class HandleConstants:
def __init__(self):
self.constants = {}
self.ctr_dispatch = { '_DECL_CONSTANT': self.decl_constant }
self.ctr_dispatch = {
'_DECL_CONSTANT': self.decl_constant,
'_DECL_CONSTANT_STR': self.decl_constant_str,
}
def set_value(self, name, value):
if name in self.constants and self.constants[name] != value:
error("Conflicting definition for constant '%s'" % name)
self.constants[name] = value
def decl_constant(self, req):
name, value = req.split()[1:]
self.set_value(name, decode_integer(value))
def decl_constant_str(self, req):
name, value = req.split()[1:]
value = value.strip()
if value.startswith('"') and value.endswith('"'):
value = value[1:-1]
if name in self.constants and self.constants[name] != value:
error("Conflicting definition for constant '%s'" % name)
self.constants[name] = value
self.set_value(name, value)
def update_data_dictionary(self, data):
data['config'] = self.constants
def generate_code(self, options):