def vardecl_stmt(node):
(VARDECL, (ID, name), init_val) = node
value = walk(init_val)
symtab.declare(name, ('INTEGER', value))
return None
def declare_temp():
name = make_temp_name()
target_name = symtab.make_target_name()
symtab.declare(name, ('INTEGER', target_name))
if not symtab.in_function:
symtab.global_vars += [(target_name, 8)]
return target_name
def fundecl_stmt(node):
(FUNDECL, (ID, name), arglist, body) = node
context = symtab.get_config()
funval = ('FUNVAL', arglist, body, context)
symtab.declare(name, funval)
return None
def vardecl_stmt(node):
(VARDECL, (ID, name), init_val) = node
t = walk(init_val)
target_name = symtab.make_target_name()
symtab.declare(name, ('INTEGER', target_name))
return ('ASSIGN', ('ADDR', target_name), t)
def declare_formal_args(formal_args):
(LIST, fl) = formal_args
outlist = list()
for (ID, sym) in fl:
target_name = symtab.make_target_name()
symtab.declare(sym, ('INTEGER', target_name))
outlist.append(('ADDR', target_name))
return ('LIST', outlist)
def vardecl_stmt(node):
(VARDECL, (ID, name), init_val) = node
t = walk(init_val)
target_name = symtab.make_target_name()
symtab.declare(name, ('INTEGER', target_name))
if not symtab.in_function:
symtab.global_vars += [(target_name, 8)]
return ('ASSIGN', ('ADDR', target_name), t)
def declare_formal_args(formal_args, actual_val_args):
'''
Walk the formal argument list and declare the identifiers on that
list using the corresponding actual args as initial values.
NOTE: this is where we implement by-value argument passing
'''
(LIST, fl) = formal_args
(LIST, avl) = actual_val_args
if len(fl) != len(avl):
raise ValueError("actual and formal argument lists do not match")
for ((ID, f), v) in zip(fl, avl):
symtab.declare(f, v)
def fundecl_stmt(node):
(FUNDECL, (ID, name), arglist, body) = node
# we don't need the function body - abbreviated function value
funval = ('FUNVAL', arglist)
symtab.declare(name, funval)
symtab.enter_function()
new_arglist = declare_formal_args(arglist)
new_body = walk(body)
frame_size = symtab.get_frame_size()
symtab.exit_function()
return ('FUNDEF', ('ADDR', name), new_arglist, new_body, ('FRAMESIZE',
frame_size))
def declare_temp():
name = make_temp_name()
target_name = symtab.make_target_name()
symtab.declare(name, ('INTEGER', target_name))
return target_name