83 lines
3.4 KiB
Python
83 lines
3.4 KiB
Python
from generators.generator import Generator
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from ground_ast import *
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from error import traceback
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class X86_64Generator(Generator):
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def __init__(self, ast, code, output_path):
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super().__init__(ast, code, output_path)
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self.stack_size = 0
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def init(self):
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self.lines.append("global _start\n\n")
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self.lines.append("_start:\n\t")
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# generate code
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self.generate()
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self.write()
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def push(self, reg: str):
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self.lines.append("push " + reg + "\n\t")
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self.stack_size += 1
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def pop(self, reg: str):
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self.lines.append("pop " + reg + "\n\t")
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self.stack_size -= 1
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def get_variable(self, var_name: str, reg: str):
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self.push(
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f"QWORD [rsp + {(self.stack_size - self.variables.get(var_name)['stack_loc'] - 1) * 8}]"
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)
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self.pop(reg)
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def change_variable(self, var_name: str, new_value):
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var_pos = (self.stack_size - self.variables.get(var_name)['stack_loc'] - 1) * 8
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if type(new_value) == NumberNode: # we're changing a variable to a number
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self.lines.append(f"mov rax, {new_value.value}\n\t")
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self.lines.append(f"mov QWORD [rsp + {var_pos}], rax\n\t")
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elif type(new_value) == VarRefNode: # we're changing a variable to the value of another variable
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self.get_variable(new_value.var_name, "rax")
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self.lines.append(f"mov QWORD [rsp + {var_pos}], rax\n\t")
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def generate_InstructionNode(self, node: InstructionNode):
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if node.instruction == "end":
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if len(node.arguments) == 0: # example: "end"
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traceback(self.code, "TypeError", "end expects atleast 1 argument.")
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elif len(node.arguments) > 1: # example: "end 1 1"
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traceback(self.code, "TypeError", "end expects only 1 argument.")
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if not type(node.arguments[0]) in [NumberNode, VarRefNode]: # example: "end true"
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traceback(self.code, "TypeError", f"end expects an integer, not {type(node.arguments[0])}")
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self.lines.append("mov rax, 60\n\t")
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if isinstance(node.arguments[0], NumberNode):
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self.lines.append("mov rdi, " + str(node.arguments[0].value) + "\n\t")
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elif isinstance(node.arguments[0], VarRefNode):
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self.get_variable(node.arguments[0].var_name, "rdi")
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#self.lines.append("mov rdi, " + str(self.get_variable(node.arguments[0].var_name)) + "\n\t")
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self.lines.append("syscall\n\t")
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elif node.instruction == "set":
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if len(node.arguments) < 2: # example: "set" or "set &hi"
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traceback(self.code, "TypeError", "set expects atleast 2 arguments.")
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elif len(node.arguments) > 2: # example: "set &hi 0 123"
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traceback(self.code, "TypeError", "set expects only 2 arguments.")
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if not isinstance(node.arguments[0], VarPointerNode):
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traceback(self.code, "TypeError", f"the first argument of set should be a variable pointer, not \"{type(node.arguments[0])}\"")
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if type(node.arguments[1]) not in [NumberNode, VarRefNode]:
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traceback(self.code, "TypeError", f"variables can't be of type \"{type(node.arguments[1])}\"")
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variable_exists = self.variables.get(node.arguments[0].var_name, None) != None
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if not variable_exists: # create a new variable
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self.variables[node.arguments[0].var_name] = {"stack_loc": (self.stack_size), "type": type(node.arguments[1])}
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if type(node.arguments[1]) == NumberNode:
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self.lines.append(f"mov rax, {node.arguments[1].value}\n\t")
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self.push("rax")
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else: # modify the existing one
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self.change_variable(node.arguments[0].var_name, node.arguments[1])
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else:
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self.lines.append("; FUCK\n\t")
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#raise NotImplementedError(f"A generate method hasn't been made for the \"{node.instruction}\" instruction.") |