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103 lines
2.6 KiB
103 lines
2.6 KiB
/** |
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* Copyright 2020 Garrit Franke |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* https://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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use crate::generator::Generator; |
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use crate::parser::node_type::{Function, Program, Statement}; |
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struct Assembly { |
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asm: Vec<String>, |
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} |
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impl Into<String> for Assembly { |
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fn into(self) -> String { |
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self.build() |
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} |
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} |
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impl Assembly { |
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fn new() -> Assembly { |
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Assembly { asm: vec![] } |
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} |
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fn add<S: Into<String>>(&mut self, string: S) { |
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self.asm.push(string.into()) |
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} |
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fn build(&self) -> String { |
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self.asm.join("\n") |
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} |
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} |
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pub struct X86Generator; |
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impl Generator for X86Generator { |
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fn generate(prog: Program) -> String { |
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Self::new().gen_program(prog).build() |
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} |
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} |
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impl X86Generator { |
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fn new() -> Self { |
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X86Generator {} |
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} |
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fn gen_program(&mut self, prog: Program) -> Assembly { |
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let mut asm = Assembly::new(); |
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match prog { |
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Program { func, globals } => { |
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asm.add(".intel_syntax noprefix"); |
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asm.add(".text"); |
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for f in func { |
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asm.add(self.gen_function(f)); |
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} |
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asm.add(".data"); |
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for g in globals { |
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asm.add(format!("_{0}: .word 0", g)); |
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} |
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} |
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}; |
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asm |
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} |
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fn gen_function(&mut self, func: Function) -> Assembly { |
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let mut asm = Assembly::new(); |
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let has_return: bool = match &func.body { |
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Statement::Block(statements) => statements.iter().any(|s| { |
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if let Statement::Return(_) = *s { |
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true |
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} else { |
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false |
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} |
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}), |
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_ => panic!("Function body should be of type Block"), |
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}; |
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asm.add(format!(".globl _{}", func.name)); |
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asm.add(format!("_{}:", func.name)); |
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asm.add("push rbp"); |
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asm.add("mov rbp, rsp"); |
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if !has_return { |
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asm.add("mov rsp, rbp"); |
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asm.add("pop rbp"); |
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asm.add("ret\n"); |
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} |
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asm |
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} |
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}
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