def visitMethod_decl(self, ctx:DecafParser.Method_declContext):
method_name = ctx.ID(0).getText()
return_type = ctx.TYPE(0)
line_number = ctx.start.line
# Checks if the method has already been declared.
if self.st.probe(method_name) != None:
print('[Error]: The method ' + method_name + ' on line: ' + line_number + 'was already declared!')
else:
self.body += method_name
self.body += ':\n'
params = []
# Loops through paramaters and creates a var symbol for them and appends them to a list.
if len(params) > 1:
for param in range(len(ctx.ID())):
param_name = ctx.ID(param).getText()
params.append(param_name)
var_symbol = self.st.probe(param_name)
if var_symbol == None:
var_symbol = VarSymbol(id=param_name, type='int', line=ctx.start.line, size=8, mem=self.st.stack_pointer)
self.st.addSymbol(var_symbol)
var_addr = var_symbol.getAddr()
self.body += '\tmovq %rax, -' + str(var_addr[0]) + '(%rsp)\n'
params.pop(0)
method_symbol = MethodSymbol(id=method_name, type=return_type, line=line_number, params=params)
self.st.addSymbol(method_symbol)
visit = self.visitChildren(ctx)
return visit
def visitField_decl(self, ctx:DecafParser.Field_declContext):
for i in range(len(ctx.field_name())):
var_name = ctx.field_name(i).getText()
var_symbol = self.st.probe(var_name)
# Declaration is an array.
if "[" in var_name:
array_var_name = ctx.field_name(i).getText()
split_var = array_var_name.split('[', 1)[0]
if var_symbol == None:
var_symbol = VarSymbol(id=split_var, type='int', line=ctx.start.line, size=8, mem=self.st.stack_pointer)
self.st.addSymbol(var_symbol)
var_addr = var_symbol.getAddr()
self.body += '\tmovq %rax, -' + str(var_addr[0]) + '(%rsp)\n'
else:
if var_symbol == None:
var_symbol = VarSymbol(id=var_name, type='int', line=ctx.start.line, size=8, mem=self.st.stack_pointer)
self.st.addSymbol(var_symbol)
var_addr = var_symbol.getAddr()
self.body += '\tmovq %rax, -' + str(var_addr[0]) + '(%rsp)\n'
else:
print('[Error]:', var_symbol.id + ', declared on line', ctx.start.line, 'has already been declared on line', var_symbol.line)
visit = self.visitChildren(ctx)
return visit
def visitVar_decl(self, ctx:DecafParser.Var_declContext):
# Loops through all variables (to evaluate int x, y, z for example.)
for i in range(len(ctx.ID())):
var_name = ctx.ID(i).getText()
var_symbol = self.st.probe(var_name)
if "[" in var_name:
array_var_name = ctx.ID(i).getText()
split_var = array_var_name.split('[', 1)[0]
else:
if var_symbol == None:
var_symbol = VarSymbol(id=var_name, type='int', line=ctx.start.line, size=8, mem=self.st.stack_pointer)
self.st.addSymbol(var_symbol)
var_addr = var_symbol.getAddr()
self.body += '\tmovq %rax, -' + str(var_addr[0]) + '(%rsp)\n'
else:
print('[Error]:', var_symbol.id + ', declared on line', ctx.start.line, 'has already been declared on line', var_symbol.line)
visit = self.visitChildren(ctx)
return visit