347 lines
14 KiB
Rust
347 lines
14 KiB
Rust
use super::{expr::destructure_range, CodeGenContext, CodeGenerator};
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use crate::typecheck::typedef::Type;
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use inkwell::values::{BasicValue, BasicValueEnum, PointerValue};
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use nac3parser::ast::{Expr, ExprKind, Stmt, StmtKind};
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pub fn gen_var<'ctx, 'a>(ctx: &mut CodeGenContext<'ctx, 'a>, ty: Type) -> PointerValue<'ctx> {
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// put the alloca in init block
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let current = ctx.builder.get_insert_block().unwrap();
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// position before the last branching instruction...
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ctx.builder.position_before(&ctx.init_bb.get_last_instruction().unwrap());
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let ty = ctx.get_llvm_type(ty);
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let ptr = ctx.builder.build_alloca(ty, "tmp");
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ctx.builder.position_at_end(current);
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ptr
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}
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pub fn gen_store_target<'ctx, 'a, G: CodeGenerator + ?Sized>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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pattern: &Expr<Option<Type>>,
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) -> PointerValue<'ctx> {
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// very similar to gen_expr, but we don't do an extra load at the end
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// and we flatten nested tuples
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match &pattern.node {
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ExprKind::Name { id, .. } => ctx.var_assignment.get(id).cloned().unwrap_or_else(|| {
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let ptr = generator.gen_var_alloc(ctx, pattern.custom.unwrap());
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ctx.var_assignment.insert(*id, ptr);
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ptr
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}),
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ExprKind::Attribute { value, attr, .. } => {
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let index = ctx.get_attr_index(value.custom.unwrap(), *attr);
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let val = generator.gen_expr(ctx, value).unwrap();
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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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ctx.builder.build_in_bounds_gep(
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ptr,
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&[
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ctx.ctx.i32_type().const_zero(),
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ctx.ctx.i32_type().const_int(index as u64, false),
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],
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"attr",
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)
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}
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}
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ExprKind::Subscript { value, slice, .. } => {
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let i32_type = ctx.ctx.i32_type();
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let v = generator.gen_expr(ctx, value).unwrap().into_pointer_value();
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let index = generator.gen_expr(ctx, slice).unwrap().into_int_value();
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unsafe {
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let arr_ptr = ctx
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.build_gep_and_load(v, &[i32_type.const_zero(), i32_type.const_int(1, false)])
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.into_pointer_value();
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ctx.builder.build_gep(arr_ptr, &[index], "loadarrgep")
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}
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}
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_ => unreachable!(),
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}
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}
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pub fn gen_assign<'ctx, 'a, G: CodeGenerator + ?Sized>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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target: &Expr<Option<Type>>,
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value: BasicValueEnum<'ctx>,
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) {
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let i32_type = ctx.ctx.i32_type();
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if let ExprKind::Tuple { elts, .. } = &target.node {
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if let BasicValueEnum::PointerValue(ptr) = value {
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for (i, elt) in elts.iter().enumerate() {
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let v = ctx.build_gep_and_load(
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ptr,
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&[i32_type.const_zero(), i32_type.const_int(i as u64, false)],
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);
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generator.gen_assign(ctx, elt, v);
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}
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} else {
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unreachable!()
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}
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} else {
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let ptr = generator.gen_store_target(ctx, target);
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ctx.builder.build_store(ptr, value);
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}
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}
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pub fn gen_for<'ctx, 'a, G: CodeGenerator + ?Sized>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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stmt: &Stmt<Option<Type>>,
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) {
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if let StmtKind::For { iter, target, body, orelse, .. } = &stmt.node {
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let int32 = ctx.ctx.i32_type();
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let zero = int32.const_zero();
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let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
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let test_bb = ctx.ctx.append_basic_block(current, "test");
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let body_bb = ctx.ctx.append_basic_block(current, "body");
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let cont_bb = ctx.ctx.append_basic_block(current, "cont");
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// if there is no orelse, we just go to cont_bb
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let orelse_bb =
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if orelse.is_empty() { cont_bb } else { ctx.ctx.append_basic_block(current, "orelse") };
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// store loop bb information and restore it later
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let loop_bb = ctx.loop_bb.replace((test_bb, cont_bb));
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let iter_val = generator.gen_expr(ctx, iter).unwrap();
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if ctx.unifier.unioned(iter.custom.unwrap(), ctx.primitives.range) {
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// setup
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let iter_val = iter_val.into_pointer_value();
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let i = generator.gen_store_target(ctx, target);
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let (start, end, step) = destructure_range(ctx, iter_val);
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ctx.builder.build_store(i, ctx.builder.build_int_sub(start, step, "start_init"));
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ctx.builder.build_unconditional_branch(test_bb);
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ctx.builder.position_at_end(test_bb);
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let sign = ctx.builder.build_int_compare(
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inkwell::IntPredicate::SGT,
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step,
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int32.const_zero(),
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"sign",
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);
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// add and test
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let tmp = ctx.builder.build_int_add(
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ctx.builder.build_load(i, "i").into_int_value(),
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step,
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"start_loop",
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);
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ctx.builder.build_store(i, tmp);
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// // if step > 0, continue when i < end
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let cmp1 = ctx.builder.build_int_compare(inkwell::IntPredicate::SLT, tmp, end, "cmp1");
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// if step < 0, continue when i > end
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let cmp2 = ctx.builder.build_int_compare(inkwell::IntPredicate::SGT, tmp, end, "cmp2");
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let pos = ctx.builder.build_and(sign, cmp1, "pos");
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let neg = ctx.builder.build_and(ctx.builder.build_not(sign, "inv"), cmp2, "neg");
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ctx.builder.build_conditional_branch(
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ctx.builder.build_or(pos, neg, "or"),
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body_bb,
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orelse_bb,
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);
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ctx.builder.position_at_end(body_bb);
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} else {
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let counter = generator.gen_var_alloc(ctx, ctx.primitives.int32);
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// counter = -1
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ctx.builder.build_store(counter, ctx.ctx.i32_type().const_int(u64::max_value(), true));
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let len = ctx
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.build_gep_and_load(iter_val.into_pointer_value(), &[zero, zero])
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.into_int_value();
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ctx.builder.build_unconditional_branch(test_bb);
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ctx.builder.position_at_end(test_bb);
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let tmp = ctx.builder.build_load(counter, "i").into_int_value();
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let tmp = ctx.builder.build_int_add(tmp, int32.const_int(1, false), "inc");
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ctx.builder.build_store(counter, tmp);
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let cmp = ctx.builder.build_int_compare(inkwell::IntPredicate::SLT, tmp, len, "cmp");
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ctx.builder.build_conditional_branch(cmp, body_bb, orelse_bb);
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ctx.builder.position_at_end(body_bb);
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let arr_ptr = ctx
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.build_gep_and_load(
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iter_val.into_pointer_value(),
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&[zero, int32.const_int(1, false)],
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)
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.into_pointer_value();
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let val = ctx.build_gep_and_load(arr_ptr, &[tmp]);
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generator.gen_assign(ctx, target, val);
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}
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for stmt in body.iter() {
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generator.gen_stmt(ctx, stmt);
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}
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ctx.builder.build_unconditional_branch(test_bb);
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if !orelse.is_empty() {
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ctx.builder.position_at_end(orelse_bb);
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for stmt in orelse.iter() {
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generator.gen_stmt(ctx, stmt);
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}
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ctx.builder.build_unconditional_branch(cont_bb);
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}
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ctx.builder.position_at_end(cont_bb);
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ctx.loop_bb = loop_bb;
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} else {
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unreachable!()
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}
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}
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pub fn gen_while<'ctx, 'a, G: CodeGenerator + ?Sized>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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stmt: &Stmt<Option<Type>>,
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) {
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if let StmtKind::While { test, body, orelse } = &stmt.node {
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let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
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let test_bb = ctx.ctx.append_basic_block(current, "test");
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let body_bb = ctx.ctx.append_basic_block(current, "body");
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let cont_bb = ctx.ctx.append_basic_block(current, "cont");
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// if there is no orelse, we just go to cont_bb
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let orelse_bb =
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if orelse.is_empty() { cont_bb } else { ctx.ctx.append_basic_block(current, "orelse") };
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// store loop bb information and restore it later
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let loop_bb = ctx.loop_bb.replace((test_bb, cont_bb));
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ctx.builder.build_unconditional_branch(test_bb);
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ctx.builder.position_at_end(test_bb);
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let test = generator.gen_expr(ctx, test).unwrap();
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if let BasicValueEnum::IntValue(test) = test {
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ctx.builder.build_conditional_branch(test, body_bb, orelse_bb);
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} else {
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unreachable!()
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};
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ctx.builder.position_at_end(body_bb);
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for stmt in body.iter() {
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generator.gen_stmt(ctx, stmt);
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}
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ctx.builder.build_unconditional_branch(test_bb);
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if !orelse.is_empty() {
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ctx.builder.position_at_end(orelse_bb);
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for stmt in orelse.iter() {
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generator.gen_stmt(ctx, stmt);
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}
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ctx.builder.build_unconditional_branch(cont_bb);
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}
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ctx.builder.position_at_end(cont_bb);
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ctx.loop_bb = loop_bb;
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} else {
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unreachable!()
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}
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}
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pub fn gen_if<'ctx, 'a, G: CodeGenerator + ?Sized>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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stmt: &Stmt<Option<Type>>,
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) -> bool {
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if let StmtKind::If { test, body, orelse } = &stmt.node {
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let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
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let test_bb = ctx.ctx.append_basic_block(current, "test");
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let body_bb = ctx.ctx.append_basic_block(current, "body");
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let mut cont_bb = None;
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// if there is no orelse, we just go to cont_bb
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let orelse_bb = if orelse.is_empty() {
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cont_bb = Some(ctx.ctx.append_basic_block(current, "cont"));
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cont_bb.unwrap()
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} else {
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ctx.ctx.append_basic_block(current, "orelse")
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};
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ctx.builder.build_unconditional_branch(test_bb);
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ctx.builder.position_at_end(test_bb);
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let test = generator.gen_expr(ctx, test).unwrap();
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if let BasicValueEnum::IntValue(test) = test {
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ctx.builder.build_conditional_branch(test, body_bb, orelse_bb);
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} else {
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unreachable!()
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};
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ctx.builder.position_at_end(body_bb);
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let mut exited = false;
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for stmt in body.iter() {
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exited = generator.gen_stmt(ctx, stmt);
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if exited {
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break;
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}
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}
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if !exited {
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if cont_bb.is_none() {
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cont_bb = Some(ctx.ctx.append_basic_block(current, "cont"));
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}
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ctx.builder.build_unconditional_branch(cont_bb.unwrap());
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}
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let then_exited = exited;
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let else_exited = if !orelse.is_empty() {
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exited = false;
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ctx.builder.position_at_end(orelse_bb);
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for stmt in orelse.iter() {
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exited = generator.gen_stmt(ctx, stmt);
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if exited {
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break;
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}
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}
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if !exited {
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if cont_bb.is_none() {
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cont_bb = Some(ctx.ctx.append_basic_block(current, "cont"));
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}
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ctx.builder.build_unconditional_branch(cont_bb.unwrap());
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}
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exited
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} else {
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false
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};
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if let Some(cont_bb) = cont_bb {
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ctx.builder.position_at_end(cont_bb);
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}
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then_exited && else_exited
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} else {
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unreachable!()
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}
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}
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pub fn gen_with<'ctx, 'a, G: CodeGenerator + ?Sized>(
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_: &mut G,
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_: &mut CodeGenContext<'ctx, 'a>,
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_: &Stmt<Option<Type>>,
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) -> bool {
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// TODO: Implement with statement after finishing exceptions
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unimplemented!()
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}
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pub fn gen_stmt<'ctx, 'a, G: CodeGenerator + ?Sized>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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stmt: &Stmt<Option<Type>>,
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) -> bool {
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match &stmt.node {
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StmtKind::Pass => {}
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StmtKind::Expr { value } => {
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generator.gen_expr(ctx, value);
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}
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StmtKind::Return { value } => {
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let value = value.as_ref().map(|v| generator.gen_expr(ctx, v).unwrap());
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let value = value.as_ref().map(|v| v as &dyn BasicValue);
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ctx.builder.build_return(value);
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return true;
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}
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StmtKind::AnnAssign { target, value, .. } => {
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if let Some(value) = value {
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let value = generator.gen_expr(ctx, value).unwrap();
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generator.gen_assign(ctx, target, value);
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}
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}
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StmtKind::Assign { targets, value, .. } => {
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let value = generator.gen_expr(ctx, value).unwrap();
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for target in targets.iter() {
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generator.gen_assign(ctx, target, value);
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}
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}
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StmtKind::Continue => {
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ctx.builder.build_unconditional_branch(ctx.loop_bb.unwrap().0);
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return true;
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}
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StmtKind::Break => {
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ctx.builder.build_unconditional_branch(ctx.loop_bb.unwrap().1);
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return true;
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}
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StmtKind::If { .. } => return generator.gen_if(ctx, stmt),
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StmtKind::While { .. } => return generator.gen_while(ctx, stmt),
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StmtKind::For { .. } => return generator.gen_for(ctx, stmt),
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StmtKind::With { .. } => return generator.gen_with(ctx, stmt),
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_ => unimplemented!(),
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};
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false
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}
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