nac3/nac3core/src/codegen/expr.rs

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use std::{collections::HashMap, convert::TryInto, iter::once, iter::zip};
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use crate::{
codegen::{
concrete_type::{ConcreteFuncArg, ConcreteTypeEnum, ConcreteTypeStore},
get_llvm_type,
get_llvm_abi_type,
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irrt::*,
stmt::{gen_raise, gen_var},
CodeGenContext, CodeGenTask,
},
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symbol_resolver::{SymbolValue, ValueEnum},
toplevel::{DefinitionId, TopLevelDef},
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typecheck::{
typedef::{FunSignature, FuncArg, Type, TypeEnum, Unifier},
magic_methods::{binop_name, binop_assign_name},
},
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};
use inkwell::{
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AddressSpace,
attributes::{Attribute, AttributeLoc},
IntPredicate,
types::{AnyType, BasicType, BasicTypeEnum},
values::{BasicValueEnum, FunctionValue, IntValue, PointerValue}
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};
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use itertools::{chain, izip, Itertools};
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use nac3parser::ast::{
self, Boolop, Comprehension, Constant, Expr, ExprKind, Location, Operator, StrRef,
};
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use super::{CodeGenerator, need_sret};
pub fn get_subst_key(
unifier: &mut Unifier,
obj: Option<Type>,
fun_vars: &HashMap<u32, Type>,
filter: Option<&Vec<u32>>,
) -> String {
let mut vars = obj
.map(|ty| {
if let TypeEnum::TObj { params, .. } = &*unifier.get_ty(ty) {
params.clone()
} else {
unreachable!()
}
})
.unwrap_or_default();
vars.extend(fun_vars.iter());
let sorted = vars.keys().filter(|id| filter.map(|v| v.contains(id)).unwrap_or(true)).sorted();
sorted
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.map(|id| {
unifier.internal_stringify(
vars[id],
&mut |id| id.to_string(),
&mut |id| id.to_string(),
&mut None,
)
})
.join(", ")
}
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impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
/// Builds a sequence of `getelementptr` and `load` instructions which stores the value of a
/// struct field into an LLVM value.
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pub fn build_gep_and_load(
&mut self,
ptr: PointerValue<'ctx>,
index: &[IntValue<'ctx>],
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name: Option<&str>,
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) -> BasicValueEnum<'ctx> {
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let gep = unsafe { self.builder.build_gep(ptr, index, "") };
self.builder.build_load(gep, name.unwrap_or_default())
}
fn get_subst_key(
&mut self,
obj: Option<Type>,
fun: &FunSignature,
filter: Option<&Vec<u32>>,
) -> String {
get_subst_key(&mut self.unifier, obj, &fun.vars, filter)
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}
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pub fn get_attr_index(&mut self, ty: Type, attr: StrRef) -> usize {
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let obj_id = match &*self.unifier.get_ty(ty) {
TypeEnum::TObj { obj_id, .. } => *obj_id,
// we cannot have other types, virtual type should be handled by function calls
_ => unreachable!(),
};
let def = &self.top_level.definitions.read()[obj_id.0];
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let index = if let TopLevelDef::Class { fields, .. } = &*def.read() {
fields.iter().find_position(|x| x.0 == attr).unwrap().0
} else {
unreachable!()
};
index
}
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pub fn gen_symbol_val(
&mut self,
generator: &mut dyn CodeGenerator,
val: &SymbolValue,
ty: Type,
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) -> BasicValueEnum<'ctx> {
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match val {
SymbolValue::I32(v) => self.ctx.i32_type().const_int(*v as u64, true).into(),
SymbolValue::I64(v) => self.ctx.i64_type().const_int(*v as u64, true).into(),
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SymbolValue::U32(v) => self.ctx.i32_type().const_int(*v as u64, false).into(),
SymbolValue::U64(v) => self.ctx.i64_type().const_int(*v as u64, false).into(),
SymbolValue::Bool(v) => self.ctx.i8_type().const_int(*v as u64, true).into(),
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SymbolValue::Double(v) => self.ctx.f64_type().const_float(*v).into(),
SymbolValue::Str(v) => {
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let str_ptr =
self.builder.build_global_string_ptr(v, "const").as_pointer_value().into();
let size = generator.get_size_type(self.ctx).const_int(v.len() as u64, false);
let ty = self.get_llvm_type(generator, self.primitives.str).into_struct_type();
ty.const_named_struct(&[str_ptr, size.into()]).into()
}
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SymbolValue::Tuple(ls) => {
let vals = ls.iter().map(|v| self.gen_symbol_val(generator, v, ty)).collect_vec();
let fields = vals.iter().map(|v| v.get_type()).collect_vec();
let ty = self.ctx.struct_type(&fields, false);
let ptr = gen_var(self, ty.into(), Some("tuple")).unwrap();
let zero = self.ctx.i32_type().const_zero();
unsafe {
for (i, val) in vals.into_iter().enumerate() {
let p = self.builder.build_in_bounds_gep(
ptr,
&[zero, self.ctx.i32_type().const_int(i as u64, false)],
"elemptr",
);
self.builder.build_store(p, val);
}
}
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self.builder.build_load(ptr, "tup_val")
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}
SymbolValue::OptionSome(v) => {
let ty = match self.unifier.get_ty_immutable(ty).as_ref() {
TypeEnum::TObj { obj_id, params, .. }
if *obj_id == self.primitives.option.get_obj_id(&self.unifier) =>
{
*params.iter().next().unwrap().1
}
_ => unreachable!("must be option type"),
};
let val = self.gen_symbol_val(generator, v, ty);
let ptr = generator.gen_var_alloc(self, val.get_type(), Some("default_opt_some")).unwrap();
self.builder.build_store(ptr, val);
ptr.into()
}
SymbolValue::OptionNone => {
let ty = match self.unifier.get_ty_immutable(ty).as_ref() {
TypeEnum::TObj { obj_id, params, .. }
if *obj_id == self.primitives.option.get_obj_id(&self.unifier) =>
{
*params.iter().next().unwrap().1
}
_ => unreachable!("must be option type"),
};
let actual_ptr_type =
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self.get_llvm_type(generator, ty).ptr_type(AddressSpace::default());
actual_ptr_type.const_null().into()
}
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}
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}
/// See [get_llvm_type].
pub fn get_llvm_type(
&mut self,
generator: &mut dyn CodeGenerator,
ty: Type,
) -> BasicTypeEnum<'ctx> {
get_llvm_type(
self.ctx,
&self.module,
generator,
&mut self.unifier,
self.top_level,
&mut self.type_cache,
&self.primitives,
ty,
)
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}
/// See [get_llvm_abi_type].
pub fn get_llvm_abi_type(
&mut self,
generator: &mut dyn CodeGenerator,
ty: Type,
) -> BasicTypeEnum<'ctx> {
get_llvm_abi_type(
self.ctx,
&self.module,
generator,
&mut self.unifier,
self.top_level,
&mut self.type_cache,
&self.primitives,
ty,
)
}
/// Generates an LLVM variable for a [constant value][value] with a given [type][ty].
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pub fn gen_const(
&mut self,
generator: &mut dyn CodeGenerator,
value: &Constant,
ty: Type,
) -> BasicValueEnum<'ctx> {
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match value {
Constant::Bool(v) => {
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assert!(self.unifier.unioned(ty, self.primitives.bool));
let ty = self.ctx.i8_type();
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ty.const_int(if *v { 1 } else { 0 }, false).into()
}
Constant::Int(val) => {
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let ty = if self.unifier.unioned(ty, self.primitives.int32)
|| self.unifier.unioned(ty, self.primitives.uint32)
{
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self.ctx.i32_type()
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} else if self.unifier.unioned(ty, self.primitives.int64)
|| self.unifier.unioned(ty, self.primitives.uint64)
{
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self.ctx.i64_type()
} else {
unreachable!();
};
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ty.const_int(*val as u64, false).into()
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}
Constant::Float(v) => {
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assert!(self.unifier.unioned(ty, self.primitives.float));
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let ty = self.ctx.f64_type();
ty.const_float(*v).into()
}
Constant::Tuple(v) => {
let ty = self.unifier.get_ty(ty);
let types =
if let TypeEnum::TTuple { ty } = &*ty { ty.clone() } else { unreachable!() };
let values = zip(types.into_iter(), v.iter())
.map(|(ty, v)| self.gen_const(generator, v, ty))
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.collect_vec();
let types = values.iter().map(BasicValueEnum::get_type).collect_vec();
let ty = self.ctx.struct_type(&types, false);
ty.const_named_struct(&values).into()
}
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Constant::Str(v) => {
assert!(self.unifier.unioned(ty, self.primitives.str));
if let Some(v) = self.const_strings.get(v) {
*v
} else {
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let str_ptr =
self.builder.build_global_string_ptr(v, "const").as_pointer_value().into();
let size = generator.get_size_type(self.ctx).const_int(v.len() as u64, false);
let ty = self.get_llvm_type(generator, self.primitives.str);
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let val =
ty.into_struct_type().const_named_struct(&[str_ptr, size.into()]).into();
self.const_strings.insert(v.to_string(), val);
val
}
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}
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_ => unreachable!(),
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}
}
/// Generates a binary operation `op` between two integral operands `lhs` and `rhs`.
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pub fn gen_int_ops(
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&mut self,
generator: &mut dyn CodeGenerator,
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op: &Operator,
lhs: BasicValueEnum<'ctx>,
rhs: BasicValueEnum<'ctx>,
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signed: bool
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) -> BasicValueEnum<'ctx> {
let (lhs, rhs) =
if let (BasicValueEnum::IntValue(lhs), BasicValueEnum::IntValue(rhs)) = (lhs, rhs) {
(lhs, rhs)
} else {
unreachable!()
};
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let float = self.ctx.f64_type();
match (op, signed) {
(Operator::Add, _) => self.builder.build_int_add(lhs, rhs, "add").into(),
(Operator::Sub, _) => self.builder.build_int_sub(lhs, rhs, "sub").into(),
(Operator::Mult, _) => self.builder.build_int_mul(lhs, rhs, "mul").into(),
(Operator::Div, true) => {
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let left = self.builder.build_signed_int_to_float(lhs, float, "i2f");
let right = self.builder.build_signed_int_to_float(rhs, float, "i2f");
self.builder.build_float_div(left, right, "fdiv").into()
}
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(Operator::Div, false) => {
let left = self.builder.build_unsigned_int_to_float(lhs, float, "i2f");
let right = self.builder.build_unsigned_int_to_float(rhs, float, "i2f");
self.builder.build_float_div(left, right, "fdiv").into()
}
(Operator::Mod, true) => self.builder.build_int_signed_rem(lhs, rhs, "mod").into(),
(Operator::Mod, false) => self.builder.build_int_unsigned_rem(lhs, rhs, "mod").into(),
(Operator::BitOr, _) => self.builder.build_or(lhs, rhs, "or").into(),
(Operator::BitXor, _) => self.builder.build_xor(lhs, rhs, "xor").into(),
(Operator::BitAnd, _) => self.builder.build_and(lhs, rhs, "and").into(),
(Operator::LShift, _) => self.builder.build_left_shift(lhs, rhs, "lshift").into(),
(Operator::RShift, _) => self.builder.build_right_shift(lhs, rhs, true, "rshift").into(),
(Operator::FloorDiv, true) => self.builder.build_int_signed_div(lhs, rhs, "floordiv").into(),
(Operator::FloorDiv, false) => self.builder.build_int_unsigned_div(lhs, rhs, "floordiv").into(),
(Operator::Pow, s) => integer_power(generator, self, lhs, rhs, s).into(),
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// special implementation?
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(Operator::MatMult, _) => unreachable!(),
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}
}
/// Generates a binary operation `op` between two floating-point operands `lhs` and `rhs`.
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pub fn gen_float_ops(
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&mut self,
op: &Operator,
lhs: BasicValueEnum<'ctx>,
rhs: BasicValueEnum<'ctx>,
) -> BasicValueEnum<'ctx> {
let (lhs, rhs) = if let (BasicValueEnum::FloatValue(lhs), BasicValueEnum::FloatValue(rhs)) =
(lhs, rhs)
{
(lhs, rhs)
} else {
unreachable!()
};
let float = self.ctx.f64_type();
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match op {
Operator::Add => self.builder.build_float_add(lhs, rhs, "fadd").into(),
Operator::Sub => self.builder.build_float_sub(lhs, rhs, "fsub").into(),
Operator::Mult => self.builder.build_float_mul(lhs, rhs, "fmul").into(),
Operator::Div => self.builder.build_float_div(lhs, rhs, "fdiv").into(),
Operator::Mod => self.builder.build_float_rem(lhs, rhs, "fmod").into(),
Operator::FloorDiv => {
let div = self.builder.build_float_div(lhs, rhs, "fdiv");
let floor_intrinsic =
self.module.get_function("llvm.floor.f64").unwrap_or_else(|| {
let fn_type = float.fn_type(&[float.into()], false);
self.module.add_function("llvm.floor.f64", fn_type, None)
});
self.builder
.build_call(floor_intrinsic, &[div.into()], "floor")
.try_as_basic_value()
.left()
.unwrap()
}
Operator::Pow => {
let pow_intrinsic = self.module.get_function("llvm.pow.f64").unwrap_or_else(|| {
let fn_type = float.fn_type(&[float.into(), float.into()], false);
self.module.add_function("llvm.pow.f64", fn_type, None)
});
self.builder
.build_call(pow_intrinsic, &[lhs.into(), rhs.into()], "f_pow")
.try_as_basic_value()
.unwrap_left()
}
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// special implementation?
_ => unimplemented!(),
}
}
pub fn build_call_or_invoke(
&mut self,
fun: FunctionValue<'ctx>,
params: &[BasicValueEnum<'ctx>],
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call_name: &str,
) -> Option<BasicValueEnum<'ctx>> {
let mut loc_params: Vec<BasicValueEnum<'ctx>> = Vec::new();
let mut return_slot = None;
let loc = self.debug_info.0.create_debug_location(
self.ctx,
self.current_loc.row as u32,
self.current_loc.column as u32,
self.debug_info.2,
None,
);
self.builder.set_current_debug_location(loc);
if fun.count_params() > 0 {
let sret_id = Attribute::get_named_enum_kind_id("sret");
let byref_id = Attribute::get_named_enum_kind_id("byref");
let byval_id = Attribute::get_named_enum_kind_id("byval");
let offset = if fun.get_enum_attribute(AttributeLoc::Param(0), sret_id).is_some() {
return_slot = Some(self.builder.build_alloca(fun.get_type().get_param_types()[0]
.into_pointer_type().get_element_type().into_struct_type(), call_name));
loc_params.push((*return_slot.as_ref().unwrap()).into());
1
} else {
0
};
for (i, param) in params.iter().enumerate() {
let loc = AttributeLoc::Param((i + offset) as u32);
if fun.get_enum_attribute(loc, byref_id).is_some() || fun.get_enum_attribute(loc, byval_id).is_some() {
// lazy update
if loc_params.is_empty() {
loc_params.extend(params[0..i+offset].iter().copied());
}
let slot = gen_var(self, param.get_type(), Some(call_name)).unwrap();
loc_params.push(slot.into());
self.builder.build_store(slot, *param);
} else if !loc_params.is_empty() {
loc_params.push(*param);
}
}
}
let params = if loc_params.is_empty() { params } else { &loc_params };
let params = fun
.get_type()
.get_param_types()
.into_iter()
.zip(params.iter())
.map(|(ty, val)| match (ty, val.get_type()) {
(BasicTypeEnum::PointerType(arg_ty), BasicTypeEnum::PointerType(val_ty))
if {
ty != val.get_type()
&& arg_ty.get_element_type().is_struct_type()
&& val_ty.get_element_type().is_struct_type()
} =>
{
self.builder.build_bitcast(*val, arg_ty, "call_arg_cast")
}
_ => *val,
})
.collect_vec();
let result = if let Some(target) = self.unwind_target {
let current = self.builder.get_insert_block().unwrap().get_parent().unwrap();
let then_block = self.ctx.append_basic_block(current, &format!("after.{}", call_name));
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let result = self
.builder
.build_invoke(fun, &params, then_block, target, call_name)
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.try_as_basic_value()
.left();
self.builder.position_at_end(then_block);
result
} else {
let param: Vec<_> = params.iter().map(|v| (*v).into()).collect();
self.builder.build_call(fun, &param, call_name).try_as_basic_value().left()
};
if let Some(slot) = return_slot {
Some(self.builder.build_load(slot, call_name))
} else {
result
}
}
/// Helper function for generating a LLVM variable storing a [String].
pub fn gen_string<S: Into<String>>(
&mut self,
generator: &mut dyn CodeGenerator,
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s: S,
) -> BasicValueEnum<'ctx> {
self.gen_const(generator, &nac3parser::ast::Constant::Str(s.into()), self.primitives.str)
}
pub fn raise_exn(
&mut self,
generator: &mut dyn CodeGenerator,
name: &str,
msg: BasicValueEnum<'ctx>,
params: [Option<IntValue<'ctx>>; 3],
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loc: Location,
) {
let zelf = if let Some(exception_val) = self.exception_val {
exception_val
} else {
let ty = self.get_llvm_type(generator, self.primitives.exception).into_pointer_type();
let zelf_ty: BasicTypeEnum = ty.get_element_type().into_struct_type().into();
let zelf = generator.gen_var_alloc(self, zelf_ty, Some("exn")).unwrap();
self.exception_val.insert(zelf).to_owned()
};
let int32 = self.ctx.i32_type();
let zero = int32.const_zero();
unsafe {
let id_ptr = self.builder.build_in_bounds_gep(zelf, &[zero, zero], "exn.id");
let id = self.resolver.get_string_id(name);
self.builder.build_store(id_ptr, int32.const_int(id as u64, false));
let ptr = self.builder.build_in_bounds_gep(
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zelf,
&[zero, int32.const_int(5, false)],
"exn.msg",
);
self.builder.build_store(ptr, msg);
let i64_zero = self.ctx.i64_type().const_zero();
for (i, attr_ind) in [6, 7, 8].iter().enumerate() {
let ptr = self.builder.build_in_bounds_gep(
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zelf,
&[zero, int32.const_int(*attr_ind, false)],
"exn.param",
);
let val = params[i].map_or(i64_zero, |v| {
self.builder.build_int_s_extend(v, self.ctx.i64_type(), "sext")
});
self.builder.build_store(ptr, val);
}
}
gen_raise(generator, self, Some(&zelf.into()), loc);
}
pub fn make_assert(
&mut self,
generator: &mut dyn CodeGenerator,
cond: IntValue<'ctx>,
err_name: &str,
err_msg: &str,
params: [Option<IntValue<'ctx>>; 3],
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loc: Location,
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) {
let err_msg = self.gen_string(generator, err_msg);
self.make_assert_impl(generator, cond, err_name, err_msg, params, loc)
}
pub fn make_assert_impl(
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&mut self,
generator: &mut dyn CodeGenerator,
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cond: IntValue<'ctx>,
err_name: &str,
err_msg: BasicValueEnum<'ctx>,
params: [Option<IntValue<'ctx>>; 3],
loc: Location,
) {
let i1 = self.ctx.bool_type();
let i1_true = i1.const_all_ones();
let expect_fun = self.module.get_function("llvm.expect.i1").unwrap_or_else(|| {
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self.module.add_function(
"llvm.expect.i1",
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i1.fn_type(&[i1.into(), i1.into()], false),
None,
)
});
// we assume that the condition is most probably true, so the normal path is the most
// probable path
// even if this assumption is violated, it does not matter as exception unwinding is
// slow anyway...
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let cond = self
.builder
.build_call(expect_fun, &[cond.into(), i1_true.into()], "expect")
.try_as_basic_value()
.left()
.unwrap()
.into_int_value();
let current_fun = self.builder.get_insert_block().unwrap().get_parent().unwrap();
let then_block = self.ctx.append_basic_block(current_fun, "succ");
let exn_block = self.ctx.append_basic_block(current_fun, "fail");
self.builder.build_conditional_branch(cond, then_block, exn_block);
self.builder.position_at_end(exn_block);
self.raise_exn(generator, err_name, err_msg, params, loc);
self.builder.position_at_end(then_block);
}
}
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/// See [CodeGenerator::gen_constructor].
pub fn gen_constructor<'ctx, 'a, G: CodeGenerator>(
generator: &mut G,
ctx: &mut CodeGenContext<'ctx, 'a>,
signature: &FunSignature,
def: &TopLevelDef,
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params: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
) -> Result<BasicValueEnum<'ctx>, String> {
match def {
TopLevelDef::Class { methods, .. } => {
// TODO: what about other fields that require alloca?
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let fun_id = methods.iter().find(|method| method.0 == "__init__".into()).and_then(|method| Some(method.2));
let ty = ctx.get_llvm_type(generator, signature.ret).into_pointer_type();
let zelf_ty: BasicTypeEnum = ty.get_element_type().try_into().unwrap();
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let zelf: BasicValueEnum<'ctx> = ctx.builder.build_alloca(zelf_ty, "alloca").into();
// call `__init__` if there is one
if let Some(fun_id) = fun_id {
let mut sign = signature.clone();
sign.ret = ctx.primitives.none;
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generator.gen_call(
ctx,
Some((signature.ret, zelf.into())),
(&sign, fun_id),
params,
)?;
}
Ok(zelf)
}
_ => unreachable!(),
}
}
/// See [CodeGenerator::gen_func_instance].
pub fn gen_func_instance<'ctx, 'a>(
ctx: &mut CodeGenContext<'ctx, 'a>,
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obj: Option<(Type, ValueEnum<'ctx>)>,
fun: (&FunSignature, &mut TopLevelDef, String),
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id: usize,
) -> Result<String, String> {
if let (
sign,
TopLevelDef::Function {
name, instance_to_symbol, instance_to_stmt, var_id, resolver, ..
},
key,
) = fun
{
if let Some(sym) = instance_to_symbol.get(&key) {
return Ok(sym.clone());
}
let symbol = format!("{}.{}", name, instance_to_symbol.len());
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instance_to_symbol.insert(key, symbol.clone());
let mut filter = var_id.clone();
if let Some((obj_ty, _)) = &obj {
if let TypeEnum::TObj { params, .. } = &*ctx.unifier.get_ty(*obj_ty) {
filter.extend(params.keys());
}
}
let key = ctx.get_subst_key(obj.as_ref().map(|a| a.0), sign, Some(&filter));
let instance = instance_to_stmt.get(&key).unwrap();
let mut store = ConcreteTypeStore::new();
let mut cache = HashMap::new();
let subst = sign
.vars
.iter()
.map(|(id, ty)| {
(
*instance.subst.get(id).unwrap(),
store.from_unifier_type(&mut ctx.unifier, &ctx.primitives, *ty, &mut cache),
)
})
.collect();
let mut signature =
store.from_signature(&mut ctx.unifier, &ctx.primitives, sign, &mut cache);
if let Some(obj) = &obj {
let zelf =
store.from_unifier_type(&mut ctx.unifier, &ctx.primitives, obj.0, &mut cache);
if let ConcreteTypeEnum::TFunc { args, .. } = &mut signature {
args.insert(
0,
ConcreteFuncArg { name: "self".into(), ty: zelf, default_value: None },
)
} else {
unreachable!()
}
}
let signature = store.add_cty(signature);
ctx.registry.add_task(CodeGenTask {
symbol_name: symbol.clone(),
body: instance.body.clone(),
resolver: resolver.as_ref().unwrap().clone(),
calls: instance.calls.clone(),
subst,
signature,
store,
unifier_index: instance.unifier_id,
id,
});
Ok(symbol)
} else {
unreachable!()
}
}
/// See [CodeGenerator::gen_call].
pub fn gen_call<'ctx, 'a, G: CodeGenerator>(
generator: &mut G,
ctx: &mut CodeGenContext<'ctx, 'a>,
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obj: Option<(Type, ValueEnum<'ctx>)>,
fun: (&FunSignature, DefinitionId),
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params: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
) -> Result<Option<BasicValueEnum<'ctx>>, String> {
let definition = ctx.top_level.definitions.read().get(fun.1 .0).cloned().unwrap();
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let id;
let key;
let param_vals;
let is_extern;
let symbol = {
// make sure this lock guard is dropped at the end of this scope...
let def = definition.read();
match &*def {
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TopLevelDef::Function {
instance_to_symbol,
instance_to_stmt,
codegen_callback,
..
} => {
if let Some(callback) = codegen_callback {
return callback.run(ctx, obj, fun, params, generator);
}
is_extern = instance_to_stmt.is_empty();
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let old_key = ctx.get_subst_key(obj.as_ref().map(|a| a.0), fun.0, None);
let mut keys = fun.0.args.clone();
let mut mapping = HashMap::new();
for (key, value) in params.into_iter() {
mapping.insert(key.unwrap_or_else(|| keys.remove(0).name), value);
}
// default value handling
for k in keys.into_iter() {
if mapping.get(&k.name).is_some() {
continue;
}
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mapping.insert(
k.name,
ctx.gen_symbol_val(generator, &k.default_value.unwrap(), k.ty).into(),
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);
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}
// reorder the parameters
let mut real_params =
fun.0.args.iter().map(|arg| (mapping.remove(&arg.name).unwrap(), arg.ty)).collect_vec();
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if let Some(obj) = &obj {
real_params.insert(0, (obj.1.clone(), obj.0));
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}
let static_params = real_params
.iter()
.enumerate()
.filter_map(|(i, (v, _))| {
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if let ValueEnum::Static(s) = v {
Some((i, s.clone()))
} else {
None
}
})
.collect_vec();
id = {
let ids = static_params
.iter()
.map(|(i, v)| (*i, v.get_unique_identifier()))
.collect_vec();
let mut store = ctx.static_value_store.lock();
match store.lookup.get(&ids) {
Some(index) => *index,
None => {
let length = store.store.len();
store.lookup.insert(ids, length);
store.store.push(static_params.into_iter().collect());
length
}
}
};
// special case: extern functions
key = if instance_to_stmt.is_empty() {
"".to_string()
} else {
format!("{}:{}", id, old_key)
};
param_vals = real_params
.into_iter()
.map(|(p, t)| p.to_basic_value_enum(ctx, generator, t))
.collect::<Result<Vec<_>, String>>()?;
instance_to_symbol.get(&key).cloned().ok_or_else(|| "".into())
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}
TopLevelDef::Class { .. } => {
return Ok(Some(generator.gen_constructor(ctx, fun.0, &*def, params)?))
}
}
}
.or_else(|_: String| {
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generator.gen_func_instance(ctx, obj.clone(), (fun.0, &mut *definition.write(), key), id)
})?;
let fun_val = ctx.module.get_function(&symbol).unwrap_or_else(|| {
let mut args = fun.0.args.clone();
if let Some(obj) = &obj {
args.insert(0, FuncArg { name: "self".into(), ty: obj.0, default_value: None });
}
let ret_type = if ctx.unifier.unioned(fun.0.ret, ctx.primitives.none) {
None
} else {
Some(ctx.get_llvm_abi_type(generator, fun.0.ret))
};
let has_sret = ret_type.map_or(false, |ret_type| need_sret(ctx.ctx, ret_type));
let mut byrefs = Vec::new();
let mut params = args.iter().enumerate()
.map(|(i, arg)| match ctx.get_llvm_abi_type(generator, arg.ty) {
BasicTypeEnum::StructType(ty) if is_extern => {
byrefs.push((i, ty));
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ty.ptr_type(AddressSpace::default()).into()
},
x => x
}.into())
.collect_vec();
if has_sret {
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params.insert(0, ret_type.unwrap().ptr_type(AddressSpace::default()).into());
}
let fun_ty = match ret_type {
Some(ret_type) if !has_sret => ret_type.fn_type(&params, false),
_ => ctx.ctx.void_type().fn_type(&params, false)
};
let fun_val = ctx.module.add_function(&symbol, fun_ty, None);
let offset = if has_sret {
fun_val.add_attribute(AttributeLoc::Param(0),
ctx.ctx.create_type_attribute(Attribute::get_named_enum_kind_id("sret"), ret_type.unwrap().as_any_type_enum()));
1
} else {
0
};
// The attribute ID used to mark arguments of a structure type.
// Structure-Typed parameters of extern functions must **not** be marked as `byval`, as
// `byval` explicitly specifies that the argument is to be passed on the stack, which breaks
// on most ABIs where the first several arguments are expected to be passed in registers.
let passing_attr_id = Attribute::get_named_enum_kind_id(
if is_extern { "byref" } else { "byval" }
);
for (i, ty) in byrefs {
fun_val.add_attribute(
AttributeLoc::Param((i as u32) + offset),
ctx.ctx.create_type_attribute(passing_attr_id, ty.as_any_type_enum())
);
}
fun_val
});
// Convert boolean parameter values into i1
let param_vals = (&fun_val.get_params()).iter().zip(param_vals)
.map(|(p, v)| {
if p.is_int_value() && v.is_int_value() {
let expected_ty = p.into_int_value().get_type();
let param_val = v.into_int_value();
if expected_ty.get_bit_width() == 1 && param_val.get_type().get_bit_width() != 1 {
generator.bool_to_i1(ctx, param_val)
} else {
param_val
}.into()
} else {
v
}
})
.collect_vec();
Ok(ctx.build_call_or_invoke(fun_val, &param_vals, "call"))
}
/// Generates three LLVM variables representing the start, stop, and step values of a [range] class
/// respectively.
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pub fn destructure_range<'ctx, 'a>(
ctx: &mut CodeGenContext<'ctx, 'a>,
range: PointerValue<'ctx>,
) -> (IntValue<'ctx>, IntValue<'ctx>, IntValue<'ctx>) {
let int32 = ctx.ctx.i32_type();
let start = ctx
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.build_gep_and_load(range, &[int32.const_zero(), int32.const_int(0, false)], Some("range.start"))
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.into_int_value();
let end = ctx
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.build_gep_and_load(range, &[int32.const_zero(), int32.const_int(1, false)], Some("range.stop"))
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.into_int_value();
let step = ctx
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.build_gep_and_load(range, &[int32.const_zero(), int32.const_int(2, false)], Some("range.step"))
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.into_int_value();
(start, end, step)
}
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/// Allocates a List structure with the given [type][ty] and [length]. The name of the resulting
/// LLVM value is `{name}.addr`, or `list.addr` if [name] is not specified.
///
/// Returns an instance of [PointerValue] pointing to the List structure. The List structure is
/// defined as `type { ty*, size_t }` in LLVM, where the first element stores the pointer to the
/// data, and the second element stores the size of the List.
pub fn allocate_list<'ctx, 'a, G: CodeGenerator>(
generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, 'a>,
ty: BasicTypeEnum<'ctx>,
length: IntValue<'ctx>,
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name: Option<&str>,
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) -> PointerValue<'ctx> {
let size_t = generator.get_size_type(ctx.ctx);
let i32_t = ctx.ctx.i32_type();
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// List structure; type { ty*, size_t }
let arr_ty = ctx.ctx
.struct_type(&[ty.ptr_type(AddressSpace::default()).into(), size_t.into()], false);
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let zero = ctx.ctx.i32_type().const_zero();
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let arr_str_ptr = ctx.builder.build_alloca(
arr_ty, format!("{}.addr", name.unwrap_or("list")).as_str()
);
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unsafe {
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// Pointer to the `length` element of the list structure
let len_ptr = ctx.builder.build_in_bounds_gep(
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arr_str_ptr,
&[zero, i32_t.const_int(1, false)],
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""
);
let length = ctx.builder.build_int_z_extend(
length,
size_t,
""
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);
ctx.builder.build_store(len_ptr, length);
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// Pointer to the `data` element of the list structure
let arr_ptr = ctx.builder.build_array_alloca(ty, length, "");
let ptr_to_arr = ctx.builder.build_in_bounds_gep(
arr_str_ptr,
&[zero, i32_t.const_zero()],
""
);
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ctx.builder.build_store(ptr_to_arr, arr_ptr);
}
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arr_str_ptr
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}
/// Generates LLVM IR for a [list comprehension expression][expr].
pub fn gen_comprehension<'ctx, 'a, G: CodeGenerator>(
generator: &mut G,
ctx: &mut CodeGenContext<'ctx, 'a>,
expr: &Expr<Option<Type>>,
) -> Result<BasicValueEnum<'ctx>, String> {
if let ExprKind::ListComp { elt, generators } = &expr.node {
let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
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let init_bb = ctx.ctx.append_basic_block(current, "listcomp.init");
let test_bb = ctx.ctx.append_basic_block(current, "listcomp.test");
let body_bb = ctx.ctx.append_basic_block(current, "listcomp.body");
let cont_bb = ctx.ctx.append_basic_block(current, "listcomp.cont");
ctx.builder.build_unconditional_branch(init_bb);
ctx.builder.position_at_end(init_bb);
let Comprehension { target, iter, ifs, .. } = &generators[0];
let iter_val = generator.gen_expr(ctx, iter)?.unwrap().to_basic_value_enum(ctx, generator, iter.custom.unwrap())?;
let int32 = ctx.ctx.i32_type();
let size_t = generator.get_size_type(ctx.ctx);
let zero_size_t = size_t.const_zero();
let zero_32 = int32.const_zero();
let index = generator.gen_var_alloc(ctx, size_t.into(), Some("index.addr"))?;
ctx.builder.build_store(index, zero_size_t);
let elem_ty = ctx.get_llvm_type(generator, elt.custom.unwrap());
let is_range = ctx.unifier.unioned(iter.custom.unwrap(), ctx.primitives.range);
let list;
let list_content;
if is_range {
let iter_val = iter_val.into_pointer_value();
let (start, end, step) = destructure_range(ctx, iter_val);
let diff = ctx.builder.build_int_sub(end, start, "diff");
// add 1 to the length as the value is rounded to zero
// the length may be 1 more than the actual length if the division is exact, but the
// length is a upper bound only anyway so it does not matter.
let length = ctx.builder.build_int_signed_div(diff, step, "div");
let length = ctx.builder.build_int_add(length, int32.const_int(1, false), "add1");
// in case length is non-positive
let is_valid =
ctx.builder.build_int_compare(IntPredicate::SGT, length, zero_32, "check");
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let normal = ctx.ctx.append_basic_block(current, "listcomp.normal_list");
let empty = ctx.ctx.append_basic_block(current, "listcomp.empty_list");
let list_init = ctx.ctx.append_basic_block(current, "listcomp.list_init");
ctx.builder.build_conditional_branch(is_valid, normal, empty);
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// normal: allocate a list
ctx.builder.position_at_end(normal);
let list_a = allocate_list(
generator,
ctx,
elem_ty,
ctx.builder.build_int_z_extend_or_bit_cast(length, size_t, "z_ext_len"),
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Some("listcomp"),
);
ctx.builder.build_unconditional_branch(list_init);
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ctx.builder.position_at_end(empty);
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let list_b = allocate_list(
generator,
ctx,
elem_ty,
zero_size_t,
Some("list_b")
);
ctx.builder.build_unconditional_branch(list_init);
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ctx.builder.position_at_end(list_init);
let phi = ctx.builder.build_phi(list_a.get_type(), "phi");
phi.add_incoming(&[(&list_a, normal), (&list_b, empty)]);
list = phi.as_basic_value().into_pointer_value();
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list_content = ctx.build_gep_and_load(list, &[zero_size_t, zero_32], Some("list_content"))
.into_pointer_value();
let i = generator.gen_store_target(ctx, target, Some("i.addr"))?;
ctx.builder.build_store(i, ctx.builder.build_int_sub(start, step, "start_init"));
ctx.builder.build_unconditional_branch(test_bb);
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ctx.builder.position_at_end(test_bb);
let sign =
ctx.builder.build_int_compare(IntPredicate::SGT, step, zero_32, "sign");
// add and test
let tmp = ctx.builder.build_int_add(
ctx.builder.build_load(i, "i").into_int_value(),
step,
"start_loop",
);
ctx.builder.build_store(i, tmp);
// if step > 0, continue when i < end
let cmp1 = ctx.builder.build_int_compare(IntPredicate::SLT, tmp, end, "cmp1");
// if step < 0, continue when i > end
let cmp2 = ctx.builder.build_int_compare(IntPredicate::SGT, tmp, end, "cmp2");
let pos = ctx.builder.build_and(sign, cmp1, "pos");
let neg = ctx.builder.build_and(ctx.builder.build_not(sign, "inv"), cmp2, "neg");
ctx.builder.build_conditional_branch(
ctx.builder.build_or(pos, neg, "or"),
body_bb,
cont_bb,
);
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ctx.builder.position_at_end(body_bb);
} else {
let length = ctx
.build_gep_and_load(
iter_val.into_pointer_value(),
&[zero_size_t, int32.const_int(1, false)],
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Some("length"),
)
.into_int_value();
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list = allocate_list(generator, ctx, elem_ty, length, Some("listcomp"));
list_content =
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ctx.build_gep_and_load(list, &[zero_size_t, zero_32], Some("list_content")).into_pointer_value();
let counter = generator.gen_var_alloc(ctx, size_t.into(), Some("counter.addr"))?;
// counter = -1
ctx.builder.build_store(counter, size_t.const_int(u64::max_value(), true));
ctx.builder.build_unconditional_branch(test_bb);
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ctx.builder.position_at_end(test_bb);
let tmp = ctx.builder.build_load(counter, "i").into_int_value();
let tmp = ctx.builder.build_int_add(tmp, size_t.const_int(1, false), "inc");
ctx.builder.build_store(counter, tmp);
let cmp = ctx.builder.build_int_compare(IntPredicate::SLT, tmp, length, "cmp");
ctx.builder.build_conditional_branch(cmp, body_bb, cont_bb);
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ctx.builder.position_at_end(body_bb);
let arr_ptr = ctx
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.build_gep_and_load(iter_val.into_pointer_value(), &[zero_size_t, zero_32], Some("arr.addr"))
.into_pointer_value();
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let val = ctx.build_gep_and_load(arr_ptr, &[tmp], Some("val"));
generator.gen_assign(ctx, target, val.into())?;
}
for cond in ifs.iter() {
let result = generator
.gen_expr(ctx, cond)?
.unwrap()
.to_basic_value_enum(ctx, generator, cond.custom.unwrap())?
.into_int_value();
let result = generator.bool_to_i1(ctx, result);
let succ = ctx.ctx.append_basic_block(current, "then");
ctx.builder.build_conditional_branch(result, succ, test_bb);
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ctx.builder.position_at_end(succ);
}
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let elem = generator.gen_expr(ctx, elt)?.unwrap();
let i = ctx.builder.build_load(index, "i").into_int_value();
let elem_ptr = unsafe { ctx.builder.build_gep(list_content, &[i], "elem_ptr") };
let val = elem.to_basic_value_enum(ctx, generator, elt.custom.unwrap())?;
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ctx.builder.build_store(elem_ptr, val);
ctx.builder
.build_store(index, ctx.builder.build_int_add(i, size_t.const_int(1, false), "inc"));
ctx.builder.build_unconditional_branch(test_bb);
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ctx.builder.position_at_end(cont_bb);
let len_ptr = unsafe {
ctx.builder.build_gep(list, &[zero_size_t, int32.const_int(1, false)], "length")
};
ctx.builder.build_store(len_ptr, ctx.builder.build_load(index, "index"));
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Ok(list.into())
} else {
unreachable!()
}
}
/// Generates LLVM IR for a [binary operator expression][expr].
///
/// * `left` - The left-hand side of the binary operator.
/// * `op` - The operator applied on the operands.
/// * `right` - The right-hand side of the binary operator.
/// * `loc` - The location of the full expression.
/// * `is_aug_assign` - Whether the binary operator expression is also an assignment operator.
pub fn gen_binop_expr<'ctx, 'a, G: CodeGenerator>(
generator: &mut G,
ctx: &mut CodeGenContext<'ctx, 'a>,
left: &Expr<Option<Type>>,
op: &Operator,
right: &Expr<Option<Type>>,
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loc: Location,
is_aug_assign: bool,
) -> Result<Option<ValueEnum<'ctx>>, String> {
let ty1 = ctx.unifier.get_representative(left.custom.unwrap());
let ty2 = ctx.unifier.get_representative(right.custom.unwrap());
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let left_val = generator
.gen_expr(ctx, left)?
.unwrap()
.to_basic_value_enum(ctx, generator, left.custom.unwrap())?;
let right_val = generator
.gen_expr(ctx, right)?
.unwrap()
.to_basic_value_enum(ctx, generator, right.custom.unwrap())?;
// we can directly compare the types, because we've got their representatives
// which would be unchanged until further unification, which we would never do
// when doing code generation for function instances
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if ty1 == ty2 && [ctx.primitives.int32, ctx.primitives.int64].contains(&ty1) {
Ok(Some(ctx.gen_int_ops(generator, op, left_val, right_val, true).into()))
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} else if ty1 == ty2 && [ctx.primitives.uint32, ctx.primitives.uint64].contains(&ty1) {
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Ok(Some(ctx.gen_int_ops(generator, op, left_val, right_val, false).into()))
} else if ty1 == ty2 && ctx.primitives.float == ty1 {
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Ok(Some(ctx.gen_float_ops(op, left_val, right_val).into()))
} else if ty1 == ctx.primitives.float && ty2 == ctx.primitives.int32 {
// Pow is the only operator that would pass typecheck between float and int
assert!(*op == Operator::Pow);
let i32_t = ctx.ctx.i32_type();
let pow_intr = ctx.module.get_function("llvm.powi.f64.i32").unwrap_or_else(|| {
let f64_t = ctx.ctx.f64_type();
let ty = f64_t.fn_type(&[f64_t.into(), i32_t.into()], false);
ctx.module.add_function("llvm.powi.f64.i32", ty, None)
});
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let res = ctx.builder
.build_call(pow_intr, &[left_val.into(), right_val.into()], "f_pow_i")
.try_as_basic_value()
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.unwrap_left();
Ok(Some(res.into()))
} else {
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let (op_name, id) = if let TypeEnum::TObj { fields, obj_id, .. } =
ctx.unifier.get_ty_immutable(left.custom.unwrap()).as_ref()
{
let (binop_name, binop_assign_name) = (
binop_name(op).into(),
binop_assign_name(op).into()
);
// if is aug_assign, try aug_assign operator first
if is_aug_assign && fields.contains_key(&binop_assign_name) {
(binop_assign_name, *obj_id)
} else {
(binop_name, *obj_id)
}
} else {
unreachable!("must be tobj")
};
let signature = match ctx.calls.get(&loc.into()) {
Some(call) => ctx.unifier.get_call_signature(*call).unwrap(),
None => {
if let TypeEnum::TObj { fields, .. } =
ctx.unifier.get_ty_immutable(left.custom.unwrap()).as_ref()
{
let fn_ty = fields.get(&op_name).unwrap().0;
if let TypeEnum::TFunc(sig) = ctx.unifier.get_ty_immutable(fn_ty).as_ref() {
sig.clone()
} else {
unreachable!("must be func sig")
}
} else {
unreachable!("must be tobj")
}
},
};
let fun_id = {
let defs = ctx.top_level.definitions.read();
let obj_def = defs.get(id.0).unwrap().read();
if let TopLevelDef::Class { methods, .. } = &*obj_def {
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methods.iter().find(|method| method.0 == op_name).unwrap().2
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} else {
unreachable!()
}
};
generator
.gen_call(
ctx,
Some((left.custom.unwrap(), left_val.into())),
(&signature, fun_id),
vec![(None, right_val.into())],
).map(|f| f.map(|f| f.into()))
}
}
/// See [CodeGenerator::gen_expr].
pub fn gen_expr<'ctx, 'a, G: CodeGenerator>(
generator: &mut G,
ctx: &mut CodeGenContext<'ctx, 'a>,
expr: &Expr<Option<Type>>,
) -> Result<Option<ValueEnum<'ctx>>, String> {
ctx.current_loc = expr.location;
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let int32 = ctx.ctx.i32_type();
let zero = int32.const_int(0, false);
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let loc = ctx.debug_info.0.create_debug_location(
ctx.ctx,
ctx.current_loc.row as u32,
ctx.current_loc.column as u32,
ctx.debug_info.2,
None,
);
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ctx.builder.set_current_debug_location(loc);
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Ok(Some(match &expr.node {
ExprKind::Constant { value, .. } => {
let ty = expr.custom.unwrap();
ctx.gen_const(generator, value, ty).into()
}
ExprKind::Name { id, .. } if id == &"none".into() => {
match (
ctx.unifier.get_ty(expr.custom.unwrap()).as_ref(),
ctx.unifier.get_ty(ctx.primitives.option).as_ref(),
) {
(
TypeEnum::TObj { obj_id, params, .. },
TypeEnum::TObj { obj_id: opt_id, .. },
) if *obj_id == *opt_id => ctx
.get_llvm_type(generator, *params.iter().next().unwrap().1)
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.ptr_type(AddressSpace::default())
.const_null()
.into(),
_ => unreachable!("must be option type"),
}
}
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ExprKind::Name { id, .. } => match ctx.var_assignment.get(id) {
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Some((ptr, None, _)) => ctx.builder.build_load(*ptr, id.to_string().as_str()).into(),
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Some((_, Some(static_value), _)) => ValueEnum::Static(static_value.clone()),
None => {
let resolver = ctx.resolver.clone();
resolver.get_symbol_value(*id, ctx).unwrap()
}
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},
ExprKind::List { elts, .. } => {
// this shall be optimized later for constant primitive lists...
// we should use memcpy for that instead of generating thousands of stores
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let elements = elts
.iter()
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.map(|x| {
generator
.gen_expr(ctx, x)
.map_or_else(
Err,
|v| v.unwrap().to_basic_value_enum(ctx, generator, x.custom.unwrap())
)
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})
.collect::<Result<Vec<_>, _>>()?;
let ty = if elements.is_empty() {
if let TypeEnum::TList { ty } = &*ctx.unifier.get_ty(expr.custom.unwrap()) {
ctx.get_llvm_type(generator, *ty)
} else {
unreachable!()
}
} else {
elements[0].get_type()
};
let length = generator.get_size_type(ctx.ctx).const_int(elements.len() as u64, false);
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let arr_str_ptr = allocate_list(generator, ctx, ty, length, Some("list"));
let arr_ptr = ctx.build_gep_and_load(arr_str_ptr, &[zero, zero], Some("list.ptr.addr"))
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.into_pointer_value();
unsafe {
for (i, v) in elements.iter().enumerate() {
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let elem_ptr = ctx.builder.build_gep(
arr_ptr,
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&[int32.const_int(i as u64, false)],
"elem_ptr",
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);
ctx.builder.build_store(elem_ptr, *v);
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}
}
arr_str_ptr.into()
}
ExprKind::Tuple { elts, .. } => {
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let element_val = elts
.iter()
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.map(|x| {
generator
.gen_expr(ctx, x)
.map_or_else(Err, |v| v.unwrap().to_basic_value_enum(ctx, generator, x.custom.unwrap()))
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})
.collect::<Result<Vec<_>, _>>()?;
let element_ty = element_val.iter().map(BasicValueEnum::get_type).collect_vec();
let tuple_ty = ctx.ctx.struct_type(&element_ty, false);
let tuple_ptr = ctx.builder.build_alloca(tuple_ty, "tuple");
for (i, v) in element_val.into_iter().enumerate() {
unsafe {
let ptr = ctx.builder.build_in_bounds_gep(
tuple_ptr,
&[zero, int32.const_int(i as u64, false)],
"ptr",
);
ctx.builder.build_store(ptr, v);
}
}
ctx.builder.build_load(tuple_ptr, "tup_val").into()
}
ExprKind::Attribute { value, attr, .. } => {
// note that we would handle class methods directly in calls
match generator.gen_expr(ctx, value)?.unwrap() {
ValueEnum::Static(v) => v.get_field(*attr, ctx).map_or_else(|| {
let v = v.to_basic_value_enum(ctx, generator, value.custom.unwrap())?;
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let index = ctx.get_attr_index(value.custom.unwrap(), *attr);
Ok(ValueEnum::Dynamic(ctx.build_gep_and_load(
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v.into_pointer_value(),
&[zero, int32.const_int(index as u64, false)],
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None,
))) as Result<_, String>
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}, Ok)?,
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ValueEnum::Dynamic(v) => {
let index = ctx.get_attr_index(value.custom.unwrap(), *attr);
ValueEnum::Dynamic(ctx.build_gep_and_load(
v.into_pointer_value(),
&[zero, int32.const_int(index as u64, false)],
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None,
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))
}
}
}
ExprKind::BoolOp { op, values } => {
// requires conditional branches for short-circuiting...
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let left = generator
.gen_expr(ctx, &values[0])?
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.unwrap()
.to_basic_value_enum(ctx, generator, values[0].custom.unwrap())?
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.into_int_value();
let left = generator.bool_to_i1(ctx, left);
let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
let a_bb = ctx.ctx.append_basic_block(current, "a");
let b_bb = ctx.ctx.append_basic_block(current, "b");
let cont_bb = ctx.ctx.append_basic_block(current, "cont");
ctx.builder.build_conditional_branch(left, a_bb, b_bb);
let (a, b) = match op {
Boolop::Or => {
ctx.builder.position_at_end(a_bb);
let a = ctx.ctx.i8_type().const_int(1, false);
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(b_bb);
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let b = generator
.gen_expr(ctx, &values[1])?
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.unwrap()
.to_basic_value_enum(ctx, generator, values[1].custom.unwrap())?
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.into_int_value();
let b = generator.bool_to_i8(ctx, b);
ctx.builder.build_unconditional_branch(cont_bb);
(a, b)
}
Boolop::And => {
ctx.builder.position_at_end(a_bb);
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let a = generator
.gen_expr(ctx, &values[1])?
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.unwrap()
.to_basic_value_enum(ctx, generator, values[1].custom.unwrap())?
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.into_int_value();
let a = generator.bool_to_i8(ctx, a);
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(b_bb);
let b = ctx.ctx.i8_type().const_zero();
ctx.builder.build_unconditional_branch(cont_bb);
(a, b)
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}
};
ctx.builder.position_at_end(cont_bb);
let phi = ctx.builder.build_phi(ctx.ctx.i8_type(), "");
phi.add_incoming(&[(&a, a_bb), (&b, b_bb)]);
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phi.as_basic_value().into()
}
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ExprKind::BinOp { op, left, right } => {
return gen_binop_expr(generator, ctx, left, op, right, expr.location, false);
}
ExprKind::UnaryOp { op, operand } => {
let ty = ctx.unifier.get_representative(operand.custom.unwrap());
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let val =
generator.gen_expr(ctx, operand)?
.unwrap()
.to_basic_value_enum(ctx, generator, operand.custom.unwrap())?;
if ty == ctx.primitives.bool {
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let val = val.into_int_value();
match op {
ast::Unaryop::Invert | ast::Unaryop::Not => {
ctx.builder.build_not(val, "not").into()
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}
_ => val.into(),
}
} else if [ctx.primitives.int32, ctx.primitives.int64].contains(&ty) {
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let val = val.into_int_value();
match op {
ast::Unaryop::USub => ctx.builder.build_int_neg(val, "neg").into(),
ast::Unaryop::Invert => ctx.builder.build_not(val, "not").into(),
ast::Unaryop::Not => ctx
.builder
.build_int_compare(
IntPredicate::EQ,
val,
val.get_type().const_zero(),
"not",
)
.into(),
_ => val.into(),
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}
} else if ty == ctx.primitives.float {
let val =
if let BasicValueEnum::FloatValue(val) = val { val } else { unreachable!() };
match op {
ast::Unaryop::USub => ctx.builder.build_float_neg(val, "neg").into(),
ast::Unaryop::Not => ctx
.builder
.build_float_compare(
inkwell::FloatPredicate::OEQ,
val,
val.get_type().const_zero(),
"not",
)
.into(),
_ => val.into(),
}
} else {
unimplemented!()
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}
}
ExprKind::Compare { left, ops, comparators } => {
izip!(chain(once(left.as_ref()), comparators.iter()), comparators.iter(), ops.iter(),)
.fold(Ok(None), |prev: Result<Option<_>, String>, (lhs, rhs, op)| {
let ty = ctx.unifier.get_representative(lhs.custom.unwrap());
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let current =
if [ctx.primitives.int32, ctx.primitives.int64, ctx.primitives.uint32, ctx.primitives.uint64, ctx.primitives.bool]
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.contains(&ty)
{
let use_unsigned_ops = [
ctx.primitives.uint32,
ctx.primitives.uint64,
].contains(&ty);
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let (lhs, rhs) = if let (
BasicValueEnum::IntValue(lhs),
BasicValueEnum::IntValue(rhs),
) = (
generator
.gen_expr(ctx, lhs)?
.unwrap()
.to_basic_value_enum(ctx, generator, lhs.custom.unwrap())?,
generator
.gen_expr(ctx, rhs)?
.unwrap()
.to_basic_value_enum(ctx, generator, rhs.custom.unwrap())?,
) {
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(lhs, rhs)
} else {
unreachable!()
};
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let op = match op {
ast::Cmpop::Eq | ast::Cmpop::Is => IntPredicate::EQ,
ast::Cmpop::NotEq => IntPredicate::NE,
_ if ty == ctx.primitives.bool => unreachable!(),
ast::Cmpop::Lt => if use_unsigned_ops {
IntPredicate::ULT
} else {
IntPredicate::SLT
},
ast::Cmpop::LtE => if use_unsigned_ops {
IntPredicate::ULE
} else {
IntPredicate::SLE
},
ast::Cmpop::Gt => if use_unsigned_ops {
IntPredicate::UGT
} else {
IntPredicate::SGT
},
ast::Cmpop::GtE => if use_unsigned_ops {
IntPredicate::UGE
} else {
IntPredicate::SGE
},
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_ => unreachable!(),
};
ctx.builder.build_int_compare(op, lhs, rhs, "cmp")
} else if ty == ctx.primitives.float {
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let (lhs, rhs) = if let (
BasicValueEnum::FloatValue(lhs),
BasicValueEnum::FloatValue(rhs),
) = (
generator
.gen_expr(ctx, lhs)?
.unwrap()
.to_basic_value_enum(ctx, generator, lhs.custom.unwrap())?,
generator
.gen_expr(ctx, rhs)?
.unwrap()
.to_basic_value_enum(ctx, generator, rhs.custom.unwrap())?,
) {
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(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!(),
};
ctx.builder.build_float_compare(op, lhs, rhs, "cmp")
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} else {
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unimplemented!()
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};
Ok(prev?.map(|v| ctx.builder.build_and(v, current, "cmp")).or(Some(current)))
})?
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.unwrap()
.into() // as there should be at least 1 element, it should never be none
}
ExprKind::IfExp { test, body, orelse } => {
let test = generator
.gen_expr(ctx, test)?
.unwrap()
.to_basic_value_enum(ctx, generator, test.custom.unwrap())?
.into_int_value();
let test = generator.bool_to_i1(ctx, test);
let body_ty = body.custom.unwrap();
let is_none = ctx.unifier.get_representative(body_ty) == ctx.primitives.none;
let result = if !is_none {
let llvm_ty = ctx.get_llvm_type(generator, body_ty);
Some(ctx.builder.build_alloca(llvm_ty, "if_exp_result"))
} else {
None
};
let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
let then_bb = ctx.ctx.append_basic_block(current, "then");
let else_bb = ctx.ctx.append_basic_block(current, "else");
let cont_bb = ctx.ctx.append_basic_block(current, "cont");
ctx.builder.build_conditional_branch(test, then_bb, else_bb);
ctx.builder.position_at_end(then_bb);
let a = generator.gen_expr(ctx, body)?;
match result {
None => None,
Some(v) => {
let a = a.unwrap().to_basic_value_enum(ctx, generator, body.custom.unwrap())?;
Some(ctx.builder.build_store(v, a))
}
};
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(else_bb);
let b = generator.gen_expr(ctx, orelse)?;
match result {
None => None,
Some(v) => {
let b = b.unwrap().to_basic_value_enum(ctx, generator, orelse.custom.unwrap())?;
Some(ctx.builder.build_store(v, b))
}
};
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(cont_bb);
match result {
None => return Ok(None),
Some(v) => return Ok(Some(ctx.builder.build_load(v, "if_exp_val_load").into()))
}
}
ExprKind::Call { func, args, keywords } => {
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let mut params = args
.iter()
.map(|arg| Ok((None, generator.gen_expr(ctx, arg)?.unwrap())) as Result<_, String>)
.collect::<Result<Vec<_>, _>>()?;
let kw_iter = keywords.iter().map(|kw| {
Ok((
Some(*kw.node.arg.as_ref().unwrap()),
generator.gen_expr(ctx, &kw.node.value)?.unwrap(),
)) as Result<_, String>
});
let kw_iter = kw_iter.collect::<Result<Vec<_>, _>>()?;
params.extend(kw_iter);
let call = ctx.calls.get(&expr.location.into());
let signature = match call {
Some(call) => ctx.unifier.get_call_signature(*call).unwrap(),
None => {
let ty = func.custom.unwrap();
if let TypeEnum::TFunc(sign) = &*ctx.unifier.get_ty(ty) {
sign.clone()
} else {
unreachable!()
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}
}
};
let func = func.as_ref();
match &func.node {
ExprKind::Name { id, .. } => {
// TODO: handle primitive casts and function pointers
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let fun = ctx
.resolver
.get_identifier_def(*id)
.map_err(|e| format!("{} (at {})", e, func.location))?;
return Ok(generator
.gen_call(ctx, None, (&signature, fun), params)?
.map(|v| v.into()));
}
ExprKind::Attribute { value, attr, .. } => {
let val = generator.gen_expr(ctx, value)?.unwrap();
let id = if let TypeEnum::TObj { obj_id, .. } =
&*ctx.unifier.get_ty(value.custom.unwrap())
{
*obj_id
} else {
unreachable!()
};
let fun_id = {
let defs = ctx.top_level.definitions.read();
let obj_def = defs.get(id.0).unwrap().read();
if let TopLevelDef::Class { methods, .. } = &*obj_def {
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methods.iter().find(|method| method.0 == *attr).unwrap().2
} else {
unreachable!()
}
};
// directly generate code for option.unwrap
// since it needs to return static value to optimize for kernel invariant
if attr == &"unwrap".into()
&& id == ctx.primitives.option.get_obj_id(&ctx.unifier)
{
match val {
ValueEnum::Static(v) => match v.get_field("_nac3_option".into(), ctx) {
// if is none, raise exception directly
None => {
let err_msg = ctx.gen_string(generator, "");
let current_fun = ctx
.builder
.get_insert_block()
.unwrap()
.get_parent()
.unwrap();
let unreachable_block = ctx.ctx.append_basic_block(
current_fun,
"unwrap_none_unreachable"
);
let exn_block = ctx.ctx.append_basic_block(
current_fun,
"unwrap_none_exception"
);
ctx.builder.build_unconditional_branch(exn_block);
ctx.builder.position_at_end(exn_block);
ctx.raise_exn(
generator,
"0:UnwrapNoneError",
err_msg,
[None, None, None],
ctx.current_loc
);
ctx.builder.position_at_end(unreachable_block);
let ptr = ctx
.get_llvm_type(generator, value.custom.unwrap())
.into_pointer_type()
.const_null();
return Ok(Some(ctx.builder.build_load(
ptr,
"unwrap_none_unreachable_load"
).into()));
}
Some(v) => return Ok(Some(v)),
}
ValueEnum::Dynamic(BasicValueEnum::PointerValue(ptr)) => {
let not_null = ctx.builder.build_is_not_null(ptr, "unwrap_not_null");
ctx.make_assert(
generator,
not_null,
"0:UnwrapNoneError",
"",
[None, None, None],
expr.location,
);
return Ok(Some(ctx.builder.build_load(
ptr,
"unwrap_some_load"
).into()))
}
_ => unreachable!("option must be static or ptr")
}
}
// Reset current_loc back to the location of the call
ctx.current_loc = expr.location;
return Ok(generator
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.gen_call(
ctx,
Some((value.custom.unwrap(), val)),
(&signature, fun_id),
params,
)?
.map(|v| v.into()));
}
_ => unimplemented!(),
}
}
ExprKind::Subscript { value, slice, .. } => {
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if let TypeEnum::TList { ty } = &*ctx.unifier.get_ty(value.custom.unwrap()) {
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let v = generator
.gen_expr(ctx, value)?
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.unwrap()
.to_basic_value_enum(ctx, generator, value.custom.unwrap())?
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.into_pointer_value();
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let ty = ctx.get_llvm_type(generator, *ty);
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let arr_ptr = ctx.build_gep_and_load(v, &[zero, zero], Some("arr.addr"))
.into_pointer_value();
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if let ExprKind::Slice { lower, upper, step } = &slice.node {
let one = int32.const_int(1, false);
let (start, end, step) =
handle_slice_indices(lower, upper, step, ctx, generator, v)?;
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let length = calculate_len_for_slice_range(
generator,
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ctx,
start,
ctx.builder
.build_select(
ctx.builder.build_int_compare(
IntPredicate::SLT,
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step,
zero,
"is_neg",
),
ctx.builder.build_int_sub(end, one, "e_min_one"),
ctx.builder.build_int_add(end, one, "e_add_one"),
"final_e",
)
.into_int_value(),
step,
);
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let res_array_ret = allocate_list(generator, ctx, ty, length, Some("ret"));
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let res_ind =
handle_slice_indices(&None, &None, &None, ctx, generator, res_array_ret)?;
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list_slice_assignment(
generator,
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ctx,
ty,
res_array_ret,
res_ind,
v,
(start, end, step),
);
res_array_ret.into()
} else {
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let len = ctx
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.build_gep_and_load(v, &[zero, int32.const_int(1, false)], Some("len"))
.into_int_value();
let raw_index = generator
.gen_expr(ctx, slice)?
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.unwrap()
.to_basic_value_enum(ctx, generator, slice.custom.unwrap())?
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.into_int_value();
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let raw_index = ctx.builder.build_int_s_extend(
raw_index,
generator.get_size_type(ctx.ctx),
"sext",
);
// handle negative index
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let is_negative = ctx.builder.build_int_compare(
IntPredicate::SLT,
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raw_index,
generator.get_size_type(ctx.ctx).const_zero(),
"is_neg",
);
let adjusted = ctx.builder.build_int_add(raw_index, len, "adjusted");
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let index = ctx
.builder
.build_select(is_negative, adjusted, raw_index, "index")
.into_int_value();
// unsigned less than is enough, because negative index after adjustment is
// bigger than the length (for unsigned cmp)
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let bound_check = ctx.builder.build_int_compare(
IntPredicate::ULT,
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index,
len,
"inbound",
);
ctx.make_assert(
generator,
bound_check,
"0:IndexError",
"index {0} out of bounds 0:{1}",
[Some(raw_index), Some(len), None],
expr.location,
);
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ctx.build_gep_and_load(arr_ptr, &[index], None).into()
}
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} else if let TypeEnum::TTuple { .. } = &*ctx.unifier.get_ty(value.custom.unwrap()) {
let index: u32 =
if let ExprKind::Constant { value: ast::Constant::Int(v), .. } = &slice.node {
(*v).try_into().unwrap()
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} else {
unreachable!("tuple subscript must be const int after type check");
};
let v = generator
.gen_expr(ctx, value)?
.unwrap();
match v {
ValueEnum::Dynamic(v) => {
let v = v.into_struct_value();
ctx.builder.build_extract_value(v, index, "tup_elem").unwrap().into()
}
ValueEnum::Static(v) => {
match v.get_tuple_element(index) {
Some(v) => v,
None => {
let tup = v
.to_basic_value_enum(ctx, generator, value.custom.unwrap())?
.into_struct_value();
ctx.builder.build_extract_value(tup, index, "tup_elem").unwrap().into()
}
}
}
}
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} else {
unreachable!("should not be other subscriptable types after type check");
}
},
ExprKind::ListComp { .. } => gen_comprehension(generator, ctx, expr)?.into(),
_ => unimplemented!(),
}))
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}