core/stmt: Add gen_for_range_callback
For generating for loops over range objects or array slices.
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@ -658,6 +658,17 @@ impl<'ctx> RangeValue<'ctx> {
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RangeValue(ptr, name)
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}
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/// Returns the element type of this `range` object.
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#[must_use]
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pub fn element_type(&self) -> IntType<'ctx> {
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self.as_ptr_value()
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.get_type()
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.get_element_type()
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.into_array_type()
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.get_element_type()
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.into_int_type()
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}
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/// Returns the underlying [`PointerValue`] pointing to the `range` instance.
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#[must_use]
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pub fn as_ptr_value(&self) -> PointerValue<'ctx> {
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@ -621,6 +621,145 @@ pub fn gen_for_callback_incrementing<'ctx, 'a, G, BodyFn>(
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)
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}
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/// Generates a `for` construct over a `range`-like iterable using lambdas, similar to the following
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/// C code:
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///
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/// ```c
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/// bool incr = start_fn() <= end_fn();
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/// for (int i = start_fn(); i /* < or > */ end_fn(); i += step_fn()) {
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/// body_fn(i);
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/// }
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/// ```
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///
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/// - `is_unsigned`: Whether to treat the values of the `range` as unsigned.
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/// - `start_fn`: A lambda of IR statements that retrieves the `start` value of the `range`-like
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/// iterable.
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/// - `stop_fn`: A lambda of IR statements that retrieves the `stop` value of the `range`-like
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/// iterable. This value will be extended to the size of `start`.
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/// - `stop_inclusive`: Whether the stop value should be treated as inclusive.
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/// - `step_fn`: A lambda of IR statements that retrieves the `step` value of the `range`-like
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/// iterable. This value will be extended to the size of `start`.
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/// - `body_fn`: A lambda of IR statements within the loop body.
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pub fn gen_for_range_callback<'ctx, 'a, G, StartFn, StopFn, StepFn, BodyFn>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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is_unsigned: bool,
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start_fn: StartFn,
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(stop_fn, stop_inclusive): (StopFn, bool),
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step_fn: StepFn,
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body_fn: BodyFn,
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) -> Result<(), String>
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where
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G: CodeGenerator + ?Sized,
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StartFn: Fn(&mut G, &mut CodeGenContext<'ctx, 'a>) -> Result<IntValue<'ctx>, String>,
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StopFn: Fn(&mut G, &mut CodeGenContext<'ctx, 'a>) -> Result<IntValue<'ctx>, String>,
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StepFn: Fn(&mut G, &mut CodeGenContext<'ctx, 'a>) -> Result<IntValue<'ctx>, String>,
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BodyFn: FnOnce(&mut G, &mut CodeGenContext<'ctx, 'a>, IntValue<'ctx>) -> Result<(), String>,
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{
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let init_val_t = start_fn(generator, ctx)
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.map(IntValue::get_type)
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.unwrap();
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gen_for_callback(
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generator,
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ctx,
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|generator, ctx| {
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let i_addr = generator.gen_var_alloc(ctx, init_val_t.into(), None)?;
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let start = start_fn(generator, ctx)?;
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ctx.builder.build_store(i_addr, start).unwrap();
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let start = start_fn(generator, ctx)?;
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let stop = stop_fn(generator, ctx)?;
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let stop = if stop.get_type().get_bit_width() != start.get_type().get_bit_width() {
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if is_unsigned {
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ctx.builder.build_int_z_extend(stop, start.get_type(), "").unwrap()
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} else {
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ctx.builder.build_int_s_extend(stop, start.get_type(), "").unwrap()
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}
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} else {
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stop
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};
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let incr = ctx.builder.build_int_compare(
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if is_unsigned { IntPredicate::ULE } else { IntPredicate::SLE },
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start,
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stop,
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"",
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).unwrap();
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Ok((i_addr, incr))
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},
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|generator, ctx, (i_addr, incr)| {
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let (lt_cmp_op, gt_cmp_op) = match (is_unsigned, stop_inclusive) {
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(true, true) => (IntPredicate::ULE, IntPredicate::UGE),
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(true, false) => (IntPredicate::ULT, IntPredicate::UGT),
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(false, true) => (IntPredicate::SLE, IntPredicate::SGE),
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(false, false) => (IntPredicate::SLT, IntPredicate::SGT),
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};
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let i = ctx.builder
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.build_load(i_addr, "")
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.map(BasicValueEnum::into_int_value)
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.unwrap();
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let stop = stop_fn(generator, ctx)?;
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let stop = if stop.get_type().get_bit_width() != i.get_type().get_bit_width() {
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if is_unsigned {
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ctx.builder.build_int_z_extend(stop, i.get_type(), "").unwrap()
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} else {
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ctx.builder.build_int_s_extend(stop, i.get_type(), "").unwrap()
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}
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} else {
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stop
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};
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let i_lt_end = ctx.builder
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.build_int_compare(lt_cmp_op, i, stop, "")
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.unwrap();
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let i_gt_end = ctx.builder
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.build_int_compare(gt_cmp_op, i, stop, "")
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.unwrap();
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let cond = ctx.builder
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.build_select(incr, i_lt_end, i_gt_end, "")
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.map(BasicValueEnum::into_int_value)
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.unwrap();
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Ok(cond)
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},
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|generator, ctx, (i_addr, _)| {
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let i = ctx.builder
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.build_load(i_addr, "")
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.map(BasicValueEnum::into_int_value)
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.unwrap();
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body_fn(generator, ctx, i)
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},
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|generator, ctx, (i_addr, _)| {
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let i = ctx.builder
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.build_load(i_addr, "")
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.map(BasicValueEnum::into_int_value)
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.unwrap();
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let incr_val = step_fn(generator, ctx)?;
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let incr_val = if incr_val.get_type().get_bit_width() != i.get_type().get_bit_width() {
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if is_unsigned {
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ctx.builder.build_int_z_extend(incr_val, i.get_type(), "").unwrap()
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} else {
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ctx.builder.build_int_s_extend(incr_val, i.get_type(), "").unwrap()
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}
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} else {
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incr_val
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};
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let i = ctx.builder.build_int_add(i, incr_val, "").unwrap();
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ctx.builder.build_store(i_addr, i).unwrap();
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Ok(())
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},
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)
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}
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/// See [`CodeGenerator::gen_while`].
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pub fn gen_while<G: CodeGenerator>(
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generator: &mut G,
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