def offer_predicate(viper_ast: ViperAST,
from_resource,
to_resource,
from_val,
to_val,
from_addr,
to_addr,
pos=None):
return viper_ast.PredicateAccess(
[from_resource, to_resource, from_val, to_val, from_addr, to_addr],
mangled.OFFER, pos)
def check_call_failed(viper_ast: ViperAST, address, pos=None, info=None):
none = viper_ast.NoPerm(pos)
predicate = viper_ast.PredicateAccess([address], mangled.FAILED, pos)
return viper_ast.GtCmp(viper_ast.CurrentPerm(predicate, pos), none, pos,
info)
def call_failed(viper_ast: ViperAST, address, pos=None, info=None):
write = viper_ast.FullPerm(pos)
predicate = viper_ast.PredicateAccess([address], mangled.FAILED, pos)
predicate_acc = viper_ast.PredicateAccessPredicate(predicate, write, pos)
return viper_ast.Inhale(predicate_acc, pos, info)
def performs_predicate(viper_ast: ViperAST, function: str, args, pos=None):
name = mangled.performs_predicate_name(function)
return viper_ast.PredicateAccess(args, name, pos)
def trust_predicate(viper_ast: ViperAST, where, address, by_address, pos=None):
return viper_ast.PredicateAccess([where, address, by_address],
mangled.TRUST, pos)
def allocation_predicate(viper_ast: ViperAST, resource, address, pos=None):
return viper_ast.PredicateAccess([resource, address], mangled.ALLOCATION,
pos)