forked from M-Labs/nac3
390 lines
18 KiB
Rust
390 lines
18 KiB
Rust
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use std::{convert::TryInto, iter::once};
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use crate::top_level::{CodeGenContext, TopLevelDef};
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use crate::typecheck::typedef::{Type, TypeEnum};
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use inkwell::{types::BasicType, values::BasicValueEnum};
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use itertools::{chain, izip, zip, Itertools};
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use rustpython_parser::ast::{self, Boolop, Constant, Expr, ExprKind, Operator};
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impl<'ctx> CodeGenContext<'ctx> {
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fn get_attr_index(&mut self, ty: Type, attr: &str) -> usize {
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let obj_id = match &*self.unifier.get_ty(ty) {
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TypeEnum::TObj { obj_id, .. } => *obj_id,
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// we cannot have other types, virtual type should be handled by function calls
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_ => unreachable!(),
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};
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let def = &self.top_level.definitions.read()[obj_id];
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let index = if let TopLevelDef::Class { fields, .. } = &*def.read() {
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fields.iter().find_position(|x| x.0 == attr).unwrap().0
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} else {
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unreachable!()
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};
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index
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}
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fn gen_const(&mut self, value: &Constant, ty: Type) -> BasicValueEnum<'ctx> {
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match value {
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Constant::Bool(v) => {
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assert!(self.unifier.unioned(ty, self.top_level.primitives.bool));
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let ty = self.ctx.bool_type();
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ty.const_int(if *v { 1 } else { 0 }, false).into()
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}
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Constant::Int(v) => {
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let ty = if self.unifier.unioned(ty, self.top_level.primitives.int32) {
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self.ctx.i32_type()
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} else if self.unifier.unioned(ty, self.top_level.primitives.int64) {
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self.ctx.i64_type()
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} else {
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unreachable!();
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};
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ty.const_int(v.try_into().unwrap(), false).into()
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}
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Constant::Float(v) => {
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assert!(self.unifier.unioned(ty, self.top_level.primitives.float));
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let ty = self.ctx.f64_type();
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ty.const_float(*v).into()
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}
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Constant::Tuple(v) => {
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let ty = self.unifier.get_ty(ty);
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let types =
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if let TypeEnum::TTuple { ty } = &*ty { ty.clone() } else { unreachable!() };
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let values = zip(types.into_iter(), v.iter())
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.map(|(ty, v)| self.gen_const(v, ty))
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.collect_vec();
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let types = values.iter().map(BasicValueEnum::get_type).collect_vec();
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let ty = self.ctx.struct_type(&types, false);
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ty.const_named_struct(&values).into()
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}
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_ => unimplemented!(),
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}
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}
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fn gen_int_ops(
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&mut self,
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op: &Operator,
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lhs: BasicValueEnum<'ctx>,
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rhs: BasicValueEnum<'ctx>,
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) -> BasicValueEnum<'ctx> {
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let (lhs, rhs) =
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if let (BasicValueEnum::IntValue(lhs), BasicValueEnum::IntValue(rhs)) = (lhs, rhs) {
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(lhs, rhs)
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} else {
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unreachable!()
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};
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match op {
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Operator::Add => self.builder.build_int_add(lhs, rhs, "add").into(),
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Operator::Sub => self.builder.build_int_sub(lhs, rhs, "sub").into(),
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Operator::Mult => self.builder.build_int_mul(lhs, rhs, "mul").into(),
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Operator::Div => {
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let float = self.ctx.f64_type();
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let left = self.builder.build_signed_int_to_float(lhs, float, "i2f");
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let right = self.builder.build_signed_int_to_float(rhs, float, "i2f");
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self.builder.build_float_div(left, right, "fdiv").into()
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}
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Operator::Mod => self.builder.build_int_signed_rem(lhs, rhs, "mod").into(),
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Operator::BitOr => self.builder.build_or(lhs, rhs, "or").into(),
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Operator::BitXor => self.builder.build_xor(lhs, rhs, "xor").into(),
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Operator::BitAnd => self.builder.build_and(lhs, rhs, "and").into(),
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Operator::LShift => self.builder.build_left_shift(lhs, rhs, "lshift").into(),
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Operator::RShift => self.builder.build_right_shift(lhs, rhs, true, "rshift").into(),
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Operator::FloorDiv => self.builder.build_int_signed_div(lhs, rhs, "floordiv").into(),
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// special implementation?
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Operator::Pow => unimplemented!(),
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Operator::MatMult => unreachable!(),
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}
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}
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fn gen_float_ops(
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&mut self,
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op: &Operator,
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lhs: BasicValueEnum<'ctx>,
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rhs: BasicValueEnum<'ctx>,
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) -> BasicValueEnum<'ctx> {
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let (lhs, rhs) = if let (BasicValueEnum::FloatValue(lhs), BasicValueEnum::FloatValue(rhs)) =
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(lhs, rhs)
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{
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(lhs, rhs)
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} else {
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unreachable!()
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};
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match op {
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Operator::Add => self.builder.build_float_add(lhs, rhs, "fadd").into(),
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Operator::Sub => self.builder.build_float_sub(lhs, rhs, "fsub").into(),
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Operator::Mult => self.builder.build_float_mul(lhs, rhs, "fmul").into(),
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Operator::Div => self.builder.build_float_div(lhs, rhs, "fdiv").into(),
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Operator::Mod => self.builder.build_float_rem(lhs, rhs, "fmod").into(),
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Operator::FloorDiv => {
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let div = self.builder.build_float_div(lhs, rhs, "fdiv");
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let floor_intrinsic =
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self.module.get_function("llvm.floor.f64").unwrap_or_else(|| {
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let float = self.ctx.f64_type();
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let fn_type = float.fn_type(&[float.into()], false);
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self.module.add_function("llvm.floor.f64", fn_type, None)
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});
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self.builder
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.build_call(floor_intrinsic, &[div.into()], "floor")
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.try_as_basic_value()
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.left()
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.unwrap()
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}
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// special implementation?
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_ => unimplemented!(),
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}
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}
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pub fn gen_expr(&mut self, expr: &Expr<Option<Type>>) -> BasicValueEnum<'ctx> {
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let zero = self.ctx.i32_type().const_int(0, false);
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let primitives = &self.top_level.primitives;
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match &expr.node {
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ExprKind::Constant { value, .. } => {
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let ty = expr.custom.clone().unwrap();
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self.gen_const(value, ty)
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}
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ExprKind::Name { id, .. } => {
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let ptr = self.var_assignment.get(id).unwrap();
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self.builder.build_load(*ptr, "load")
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}
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ExprKind::List { elts, .. } => {
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// this shall be optimized later for constant primitive lists...
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let elements = elts.iter().map(|x| self.gen_expr(x)).collect_vec();
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let ty = if elements.is_empty() {
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self.ctx.i32_type().into()
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} else {
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elements[0].get_type()
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};
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// this length includes the leading length element
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let arr_ty = self.ctx.struct_type(
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&[self.ctx.i32_type().into(), ty.array_type(elements.len() as u32).into()],
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false,
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);
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let arr_ptr = self.builder.build_alloca(arr_ty, "tmparr");
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unsafe {
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let len_ptr = arr_ptr
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.const_in_bounds_gep(&[zero, self.ctx.i32_type().const_int(0u64, false)]);
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self.builder.build_store(
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len_ptr,
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self.ctx.i32_type().const_int(elements.len() as u64, false),
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);
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let arr_offset = self.ctx.i32_type().const_int(1, false);
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for (i, v) in elements.iter().enumerate() {
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let ptr = self.builder.build_in_bounds_gep(
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arr_ptr,
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&[zero, arr_offset, self.ctx.i32_type().const_int(i as u64, false)],
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"arr_element",
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);
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self.builder.build_store(ptr, *v);
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}
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}
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arr_ptr.into()
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}
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ExprKind::Tuple { elts, .. } => {
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let element_val = elts.iter().map(|x| self.gen_expr(x)).collect_vec();
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let element_ty = element_val.iter().map(BasicValueEnum::get_type).collect_vec();
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let tuple_ty = self.ctx.struct_type(&element_ty, false);
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let tuple_ptr = self.builder.build_alloca(tuple_ty, "tuple");
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for (i, v) in element_val.into_iter().enumerate() {
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unsafe {
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let ptr = tuple_ptr.const_in_bounds_gep(&[
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zero,
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self.ctx.i32_type().const_int(i as u64, false),
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]);
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self.builder.build_store(ptr, v);
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}
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}
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tuple_ptr.into()
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}
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ExprKind::Attribute { value, attr, .. } => {
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// note that we would handle class methods directly in calls
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let index = self.get_attr_index(value.custom.unwrap(), attr);
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let val = self.gen_expr(value);
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let ptr = if let BasicValueEnum::PointerValue(v) = val {
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v
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} else {
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unreachable!();
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};
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unsafe {
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let ptr = ptr.const_in_bounds_gep(&[
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zero,
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self.ctx.i32_type().const_int(index as u64, false),
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]);
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self.builder.build_load(ptr, "field")
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}
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}
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ExprKind::BoolOp { op, values } => {
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// requires conditional branches for short-circuiting...
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let left = if let BasicValueEnum::IntValue(left) = self.gen_expr(&values[0]) {
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left
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} else {
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unreachable!()
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};
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let current = self.builder.get_insert_block().unwrap().get_parent().unwrap();
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let a_bb = self.ctx.append_basic_block(current, "a");
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let b_bb = self.ctx.append_basic_block(current, "b");
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let cont_bb = self.ctx.append_basic_block(current, "cont");
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self.builder.build_conditional_branch(left, a_bb, b_bb);
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let (a, b) = match op {
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Boolop::Or => {
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self.builder.position_at_end(a_bb);
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let a = self.ctx.bool_type().const_int(1, false);
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self.builder.build_unconditional_branch(cont_bb);
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self.builder.position_at_end(b_bb);
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let b = if let BasicValueEnum::IntValue(b) = self.gen_expr(&values[1]) {
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b
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} else {
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unreachable!()
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};
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self.builder.build_unconditional_branch(cont_bb);
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(a, b)
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}
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Boolop::And => {
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self.builder.position_at_end(a_bb);
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let a = if let BasicValueEnum::IntValue(a) = self.gen_expr(&values[1]) {
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a
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} else {
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unreachable!()
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};
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self.builder.build_unconditional_branch(cont_bb);
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self.builder.position_at_end(b_bb);
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let b = self.ctx.bool_type().const_int(0, false);
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self.builder.build_unconditional_branch(cont_bb);
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(a, b)
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}
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};
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self.builder.position_at_end(cont_bb);
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let phi = self.builder.build_phi(self.ctx.bool_type(), "phi");
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phi.add_incoming(&[(&a, a_bb), (&b, b_bb)]);
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phi.as_basic_value()
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}
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ExprKind::BinOp { op, left, right } => {
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let ty1 = self.unifier.get_representative(left.custom.unwrap());
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let ty2 = self.unifier.get_representative(left.custom.unwrap());
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let left = self.gen_expr(left);
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let right = self.gen_expr(right);
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// we can directly compare the types, because we've got their representatives
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// which would be unchanged until further unification, which we would never do
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// when doing code generation for function instances
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if ty1 != ty2 {
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unimplemented!()
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} else if [primitives.int32, primitives.int64].contains(&ty1) {
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self.gen_int_ops(op, left, right)
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} else if primitives.float == ty1 {
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self.gen_float_ops(op, left, right)
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} else {
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unimplemented!()
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}
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}
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ExprKind::UnaryOp { op, operand } => {
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let ty = self.unifier.get_representative(operand.custom.unwrap());
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let val = self.gen_expr(operand);
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if ty == primitives.bool {
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let val =
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if let BasicValueEnum::IntValue(val) = val { val } else { unreachable!() };
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match op {
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ast::Unaryop::Invert | ast::Unaryop::Not => {
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self.builder.build_not(val, "not").into()
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}
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_ => val.into(),
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}
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} else if [primitives.int32, primitives.int64].contains(&ty) {
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let val =
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if let BasicValueEnum::IntValue(val) = val { val } else { unreachable!() };
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match op {
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ast::Unaryop::USub => self.builder.build_int_neg(val, "neg").into(),
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ast::Unaryop::Invert => self.builder.build_not(val, "not").into(),
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ast::Unaryop::Not => self
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.builder
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.build_int_compare(
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inkwell::IntPredicate::EQ,
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val,
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val.get_type().const_zero(),
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"not",
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)
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.into(),
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_ => val.into(),
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}
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} else if ty == primitives.float {
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let val = if let BasicValueEnum::FloatValue(val) = val {
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val
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} else {
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unreachable!()
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};
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match op {
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ast::Unaryop::USub => self.builder.build_float_neg(val, "neg").into(),
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ast::Unaryop::Not => self
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.builder
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.build_float_compare(
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inkwell::FloatPredicate::OEQ,
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val,
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val.get_type().const_zero(),
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"not",
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)
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.into(),
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_ => val.into(),
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}
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} else {
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unimplemented!()
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}
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}
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ExprKind::Compare { left, ops, comparators } => {
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izip!(
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chain(once(left.as_ref()), comparators.iter()),
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comparators.iter(),
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ops.iter(),
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)
|
||
|
|
.fold(None, |prev, (lhs, rhs, op)| {
|
||
|
|
let ty = lhs.custom.unwrap();
|
||
|
|
let current = if [primitives.int32, primitives.int64, primitives.bool]
|
||
|
|
.contains(&ty)
|
||
|
|
{
|
||
|
|
let (lhs, rhs) =
|
||
|
|
if let (BasicValueEnum::IntValue(lhs), BasicValueEnum::IntValue(rhs)) =
|
||
|
|
(self.gen_expr(lhs), self.gen_expr(rhs))
|
||
|
|
{
|
||
|
|
(lhs, rhs)
|
||
|
|
} else {
|
||
|
|
unreachable!()
|
||
|
|
};
|
||
|
|
let op = match op {
|
||
|
|
ast::Cmpop::Eq | ast::Cmpop::Is => inkwell::IntPredicate::EQ,
|
||
|
|
ast::Cmpop::NotEq => inkwell::IntPredicate::NE,
|
||
|
|
ast::Cmpop::Lt => inkwell::IntPredicate::SLT,
|
||
|
|
ast::Cmpop::LtE => inkwell::IntPredicate::SLE,
|
||
|
|
ast::Cmpop::Gt => inkwell::IntPredicate::SGT,
|
||
|
|
ast::Cmpop::GtE => inkwell::IntPredicate::SGE,
|
||
|
|
_ => unreachable!(),
|
||
|
|
};
|
||
|
|
self.builder.build_int_compare(op, lhs, rhs, "cmp")
|
||
|
|
} else if ty == primitives.float {
|
||
|
|
let (lhs, rhs) = if let (
|
||
|
|
BasicValueEnum::FloatValue(lhs),
|
||
|
|
BasicValueEnum::FloatValue(rhs),
|
||
|
|
) = (self.gen_expr(lhs), self.gen_expr(rhs))
|
||
|
|
{
|
||
|
|
(lhs, rhs)
|
||
|
|
} else {
|
||
|
|
unreachable!()
|
||
|
|
};
|
||
|
|
let op = match op {
|
||
|
|
ast::Cmpop::Eq | ast::Cmpop::Is => inkwell::FloatPredicate::OEQ,
|
||
|
|
ast::Cmpop::NotEq => inkwell::FloatPredicate::ONE,
|
||
|
|
ast::Cmpop::Lt => inkwell::FloatPredicate::OLT,
|
||
|
|
ast::Cmpop::LtE => inkwell::FloatPredicate::OLE,
|
||
|
|
ast::Cmpop::Gt => inkwell::FloatPredicate::OGT,
|
||
|
|
ast::Cmpop::GtE => inkwell::FloatPredicate::OGE,
|
||
|
|
_ => unreachable!(),
|
||
|
|
};
|
||
|
|
self.builder.build_float_compare(op, lhs, rhs, "cmp")
|
||
|
|
} else {
|
||
|
|
unimplemented!()
|
||
|
|
};
|
||
|
|
prev.map(|v| self.builder.build_and(v, current, "cmp")).or(Some(current))
|
||
|
|
})
|
||
|
|
.unwrap()
|
||
|
|
.into() // as there should be at least 1 element, it should never be none
|
||
|
|
}
|
||
|
|
_ => unimplemented!(),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|