96 lines
2.9 KiB
Rust
96 lines
2.9 KiB
Rust
// Copyright (c) 2022 Marceline Cramer
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// SPDX-License-Identifier: GPL-3.0-or-later
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use crate::parse::ast;
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use cranelift::codegen::{self, Context};
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use cranelift::frontend::FunctionBuilderContext;
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use cranelift::prelude::*;
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use cranelift_jit::{JITBuilder, JITModule};
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use cranelift_module::{DataContext, Linkage, Module};
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pub struct Engine {
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builder_context: FunctionBuilderContext,
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ctx: Context,
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data_ctx: DataContext,
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module: JITModule,
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}
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impl Engine {
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pub fn new() -> Self {
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let builder = JITBuilder::new(cranelift_module::default_libcall_names());
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let module = JITModule::new(builder);
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Self {
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builder_context: FunctionBuilderContext::new(),
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ctx: module.make_context(),
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data_ctx: DataContext::new(),
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module,
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}
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}
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pub fn compile(&mut self, expr: &ast::Expr) -> Result<*const u8, String> {
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self.translate(expr)?;
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let name = "dummy_function";
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let id = self
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.module
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.declare_function(name, Linkage::Export, &self.ctx.func.signature)
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.map_err(|e| e.to_string())?;
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let mut trap_sink = codegen::binemit::NullTrapSink {};
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let mut stack_map_sink = codegen::binemit::NullStackMapSink {};
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self.module
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.define_function(id, &mut self.ctx, &mut trap_sink, &mut stack_map_sink)
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.map_err(|e| e.to_string())?;
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self.module.clear_context(&mut self.ctx);
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self.module.finalize_definitions();
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let code = self.module.get_finalized_function(id);
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Ok(code)
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}
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pub fn translate(&mut self, expr: &ast::Expr) -> Result<(), String> {
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let int = self.module.target_config().pointer_type();
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self.ctx.func.signature.returns.push(AbiParam::new(int));
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let mut builder = FunctionBuilder::new(&mut self.ctx.func, &mut self.builder_context);
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let entry_block = builder.create_block();
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builder.append_block_params_for_function_params(entry_block);
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builder.switch_to_block(entry_block);
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builder.seal_block(entry_block);
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let mut trans = super::translate::FunctionTranslator { int, builder };
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let return_value = trans.translate_expr(expr);
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trans.builder.ins().return_(&[return_value]);
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println!("{}", trans.builder.func.display());
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trans.builder.finalize();
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn simple_math() {
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use crate::parse::{
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lexer::{Lexer, Token},
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rd::RecursiveDescent,
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};
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let source = "(1 + 2) * (3 / (4 + 5));";
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let lexer = Lexer::new(source);
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let mut rd = RecursiveDescent::new(lexer);
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let (expr, tail) = rd.build_expr();
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let expr = expr.expect("Failed to parse expression");
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assert_eq!(tail, Token::Semicolon);
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Engine::new().compile(&expr).unwrap();
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}
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}
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