def visitMethod_call(self, ctx: DecafParser.Method_callContext):
line_num = ctx.start.line
method_name = ctx.method_name()
method_symbol = self.st.probe(method_name.getText())
# 6
# Check method is of type bool or int
if method_symbol != None and method_symbol.type == 'void':
# 6
print('Error on line ' + str(line_num) + ' method \'' +
method_name.getText() + '\' must return a value')
# 5
if method_symbol != None:
# Check correct number of args
if len(method_symbol.params) != len(ctx.expr()):
print('Error on line ' + str(line_num) + ' method ' +
method_name.getText() + ' needs ' +
str(len(method_symbol.params)) + ' arguments has ' +
str(len(ctx.expr())))
else:
#Check correct types of args
for i in range(len(method_symbol.params)):
param_type = method_symbol.params[i].split(' ')[0]
if (param_type == 'int'
and ctx.expr(i).data_literal().int_literal()
== None) or (param_type == 'boolean' and ctx.expr(
i).data_literal().bool_literal() == None):
print('Error on line ' + str(line_num) +
' type mismatch on method \'' +
method_name.getText() + '\' parameters')
self.visitChildren(ctx)
def visitMethod_call(self, ctx: DecafParser.Method_callContext):
if ctx.method_name():
for i in range(len(ctx.expr())):
self.visit(ctx.expr(i))
self.st.stack_pointer[-1] += 8
self.body += 'movq %rax, ' + str(-self.st.stack_pointer[-1]) + '(%rsp)\n'
for i in range(len(ctx.expr())):
self.body += 'movq ' + str(-self.st.stack_pointer[-1]) + '(%rsp), ' + param_registers[
len(ctx.expr()) - i - 1] + '\n'
self.st.stack_pointer[-1] -= 8
# adjust stack to 16-byte alignment (multiple of 8 that is not divisible by 16)
stack_len = self.st.stack_pointer[-1]
stack_len = stack_len + (stack_len // 8 + 1 % 2) * 8
self.body += 'subq $' + str(stack_len) + ', %rsp\n'
method_name = ctx.method_name().getText()
self.body += 'call ' + method_name + '\n'
self.body += 'addq $' + str(stack_len) + ', %rsp\n'
elif ctx.CALLOUT():
for i in range(len(ctx.callout_arg())):
if ctx.callout_arg(i).STRING_LITERAL():
callout_arg = ctx.callout_arg(i).getText()
label = 'str' + str(ctx.callout_arg(i).start.start)
self.head += label + ': .asciz ' + callout_arg + '\n'
self.st.stack_pointer[-1] += 8
self.body += 'movq $' + label + ', ' + str(-self.st.stack_pointer[-1]) + '(%rsp)\n'
else:
pass
def visitMethod_call(self, ctx:DecafParser.Method_callContext):
if ctx.method_name():
for i in range(len(ctx.expr())):
self.visit(ctx.expr(i))
self.st.stack_pointer[-1] += 8
ptr = self.st.stack_pointer[-1]
self.body += 'movq %rax, ' + str(ptr) + '(%rsp)\n'
for z in range(len(ctx.expr())):
ptr = self.st.stack_pointer[-1]
reg = param_registers[z]
self.body += 'movq ' + str(ptr) + '(% rsp), ' + reg + '\n'
self.st.stack_pointer[-1] -= 8
#Current pos stored in symbol table
#Needs to be 16 byte aligned or we get segmentation errors
stack_len = self.st.stack_pointer[-1]
stack_len = stack_len + (int(stack_len/8+1) % 2) * 8
self.body += 'subq $' + str(stack_len) + ', %rsp\n'
method_name = ctx.method_name().getText()
self.body += 'call ' + method_name + '\n'
self.body += 'addq $' + str(stack_len) + ', %rsp\n'
elif ctx.CALLOUT():
pass
else:
self.visitChildren(ctx)
def visitMethod_call(self, ctx: DecafParser.Method_callContext):
#Rule 5 find out the count of params currently found for a method_call and check if they match the len which is in the symbol table for this method
if ctx.method_name() != None and ctx.expr() != None:
id = ctx.method_name().getText()
if self.st.lookup(id) == None or len(ctx.expr()) < len(self.st.lookup(id).params) or len(ctx.expr()) > len(self.st.lookup(id).params):
count = 0
if self.st.lookup(id) != None:
count = len(self.st.lookup(id).params)
print('[Rule 5] error param length do not match expected for method_call', id,'lookup param count is:', count ,'found params in call_method:', len(ctx.expr()))
return self.visitChildren(ctx)
def visitMethod_call(self, ctx: DecafParser.Method_callContext):
# get method call
line_num = ctx.start.line
method_name = ctx.method_name().getText()
# lookup method call name in symbol table
method_symbol = self.st.lookup(method_name)
method_symbol_params = method_symbol.params
if len(ctx.expr()) != len(method_symbol_params):
return print(
"Error you passed an incorrect combination of parameters",
"on line", line_num,
", the number and types of arguments in a method call must be the same as the number and types of the formals"
)
else:
for i in range(max(len(method_symbol_params), len(ctx.expr()))):
# check out of bound index
if i >= len(method_symbol_params):
print(
"Error you passed an unexpected parameter",
ctx.expr()[i].literal().getText(), "on line", line_num,
", the number and types of arguments in a method call must be the same as the number and types of the formals"
)
else:
if method_symbol_params[i] == 'int':
if ctx.expr()[i].literal().int_literal() == None:
print(
"Error incorrect parameter data type expected",
method_symbol.type, "received value",
ctx.expr()[i].literal().getText(), "on line",
line_num,
", the number and types of arguments in a method call must be the same as the number and types of the formals"
)
elif method_symbol_params[i] == 'boolean':
if ctx.expr()[i].literal().bool_literal() == None:
print(
"Error incorrect parameter date type expected",
method_symbol.type, "received",
ctx.expr()[i].literal(), "on line", line_num,
", the number and types of arguments in a method call must be the same as the number and types of the formals"
)
else:
print(
"missing method_symbol_params with data type classification:",
method_symbol_params[i], " on line number",
line_num,
", the number and types of arguments in a method call must be the same as the number and types of the formals"
)
return self.visitChildren(ctx)
def visitMethod_call(self, ctx: DecafParser.Method_callContext):
line_number = ctx.start.line
param_names = ctx.expr()
if "callout" in ctx.getText():
callout_argument = ctx.callout_arg(0).getText()
print(callout_argument)
self.body += 'mov edx, len \n' #message length
self.body += 'mov ecx, msg \n' #message to to be written
self.body += 'mov ebx, 1 \n' #file descriptor
self.body += 'mov eax, 4 \n' #system call number (system write)
self.body += 'int 0x80 \n' #call the kernel
self.body += 'mov eax, 1 \n' #system call number (system exit)
self.body += 'int 0x80 \n' #call kernel again
self.body += 'section .data \n'
self.body += 'msg db ' + callout_argument + ', 0x0' + '\n' #string to be printed
self.body += 'len equ $-msg \n' #ength of string
else:
method_params = self.st.lookup(ctx.id().getText()).params
"""
if the length of the paramertor lists in the method call and
the original method decal are not the same throw an error
"""
if len(method_params) != len(param_names):
print("ERROR: " + "method " + ctx.id().getText() + " epecting",
len(method_params), "input params but got",
len(param_names), "on line", line_number)
else:
for i in range(len(param_names)):
"""
if any of the method params in the
original method decal is a boolean
check if the types of the oringal params
and the types of the called params match
"""
if self.st.lookup(
method_params[i].getText()).type == "boolean":
for i in range(len(ctx.expr())):
if self.st.lookup(
param_names[i].getText()) != None:
if self.st.lookup(param_names[i].getText(
)).type != self.st.lookup(
method_params[i].getText()).type:
print(
"ERROR: wrong paramertor type found for method call on line:",
line_number)
try:
int(param_names[i].getText())
print(
"ERROR: parametor type cannot be boolean for method call",
"int", "on line:", line_number)
except:
pass
"""
check if a varible inside of method call exists
"""
if param_names != None:
for name in param_names:
if name.literal() == None:
pass
else:
if name.literal().bool_literal() or name.literal(
).int_litereal():
pass
else:
self.params.append(name.getText())
var_symbol = self.st.lookup(name.getText())
if var_symbol != None:
pass
else:
print(
"ERROR:",
"varible referanced but never assinged " +
" '" + name.getText() + "' " + "on line",
line_number)
return self.params
# Visit a parse tree produced by DecafParser#block."""
return self.visitChildren(ctx)