forked from M-Labs/nac3
core: add RustSlice::indices
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52da6347ee
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@ -181,3 +181,22 @@ template <typename T> struct Slice
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}
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};
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} // namespace
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extern "C"
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{
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void __nac3_slice_indices_i32(bool start_defined, int32_t start, bool stop_defined, int32_t stop, bool step_defined,
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int32_t step, int32_t length, int32_t *range_start, int32_t *range_stop,
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int32_t *range_step)
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{
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slice::indices(start_defined, start, stop_defined, stop, step_defined, step, length, range_start, range_stop,
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range_step);
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}
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void __nac3_slice_indices_i64(bool start_defined, int64_t start, bool stop_defined, int64_t stop, bool step_defined,
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int64_t step, int64_t length, int64_t *range_start, int64_t *range_stop,
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int64_t *range_step)
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{
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slice::indices(start_defined, start, stop_defined, stop, step_defined, step, length, range_start, range_stop,
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range_step);
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}
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}
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@ -635,6 +635,43 @@ pub fn call_nac3_range_len<'ctx, G: CodeGenerator + ?Sized, N: IntKind<'ctx>>(
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.returning("range_len", Int(int_kind))
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}
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#[allow(clippy::too_many_arguments)]
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pub fn call_nac3_slice_indices<'ctx, G: CodeGenerator + ?Sized, N: IntKind<'ctx>>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, '_>,
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int_kind: N,
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start_defined: Instance<'ctx, Int<Bool>>,
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start: Instance<'ctx, Int<N>>,
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stop_defined: Instance<'ctx, Int<Bool>>,
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stop: Instance<'ctx, Int<N>>,
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step_defined: Instance<'ctx, Int<Bool>>,
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step: Instance<'ctx, Int<N>>,
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length: Instance<'ctx, Int<N>>,
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range_start: Instance<'ctx, Ptr<Int<N>>>,
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range_stop: Instance<'ctx, Ptr<Int<N>>>,
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range_step: Instance<'ctx, Ptr<Int<N>>>,
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) -> Instance<'ctx, Int<N>> {
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let bit_width = int_kind.get_int_type(generator, ctx.ctx).get_bit_width();
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let func_name = match bit_width {
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32 => "__nac3_slice_indices_i32",
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64 => "__nac3_slice_indices_i64",
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_ => panic!("{bit_width}-bits ints not supported"), // We could add more variants when necessary.
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};
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CallFunction::begin(generator, ctx, func_name)
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.arg(start_defined)
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.arg(start)
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.arg(stop_defined)
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.arg(stop)
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.arg(step_defined)
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.arg(step)
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.arg(length)
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.arg(range_start)
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.arg(range_stop)
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.arg(range_step)
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.returning("range_len", Int(int_kind))
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}
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pub fn call_nac3_ndarray_util_assert_shape_no_negative<'ctx, G: CodeGenerator + ?Sized>(
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, '_>,
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@ -1,4 +1,6 @@
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use crate::codegen::{model::*, CodeGenContext, CodeGenerator};
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use crate::codegen::{irrt::call_nac3_slice_indices, model::*, CodeGenContext, CodeGenerator};
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use super::range::RustRange;
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/// Fields of [`Slice`]
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#[derive(Debug, Clone)]
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@ -35,6 +37,9 @@ impl<'ctx, N: IntKind<'ctx>> StructKind<'ctx> for Slice<N> {
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/// [`Option::None`] if unspecified.
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#[derive(Debug, Clone)]
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pub struct RustSlice<'ctx, N: IntKind<'ctx>> {
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// It is possible that `start`, `stop`, and `step` are all `None`.
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// We need to know the `int_kind` even when that is the case.
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pub int_kind: N,
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pub start: Option<Instance<'ctx, Int<N>>>,
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pub stop: Option<Instance<'ctx, Int<N>>>,
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pub step: Option<Instance<'ctx, Int<N>>>,
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@ -75,6 +80,64 @@ impl<'ctx, N: IntKind<'ctx>> RustSlice<'ctx, N> {
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None => dst_slice_ptr.gep(ctx, |f| f.step_defined).store(ctx, false_),
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}
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}
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/// Resolve this [`RustSlice`] into a [`RustRange`] like `slice.indices` in Python.
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///
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/// NOTE: This function does stack allocation.
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pub fn indices<G: CodeGenerator + ?Sized>(
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&self,
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generator: &mut G,
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ctx: &mut CodeGenContext<'ctx, '_>,
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length: Instance<'ctx, Int<N>>,
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) -> RustRange<'ctx, N> {
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let mut is_defined = |value: Option<_>| -> Instance<'ctx, Int<Bool>> {
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Int(Bool).const_int(generator, ctx.ctx, u64::from(value.is_some()))
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};
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let start_defined = is_defined(self.start);
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let stop_defined = is_defined(self.stop);
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let step_defined = is_defined(self.step);
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let mut defined_or_zero = |value: Option<_>| -> Instance<'ctx, Int<N>> {
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if let Some(value) = value {
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value
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} else {
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// If undefined, return 0 as a placeholder.
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Int(self.int_kind).const_0(generator, ctx.ctx)
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}
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};
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let start = defined_or_zero(self.start);
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let stop = defined_or_zero(self.stop);
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let step = defined_or_zero(self.step);
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// Stack allocation here.
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let range_start = Int(self.int_kind).alloca(generator, ctx);
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let range_stop = Int(self.int_kind).alloca(generator, ctx);
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let range_step = Int(self.int_kind).alloca(generator, ctx);
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call_nac3_slice_indices(
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generator,
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ctx,
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self.int_kind,
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start_defined,
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start,
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stop_defined,
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stop,
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step_defined,
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step,
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length,
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range_start,
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range_stop,
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range_step,
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);
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let start = range_start.load(generator, ctx);
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let stop = range_stop.load(generator, ctx);
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let step = range_step.load(generator, ctx);
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RustRange { start, stop, step }
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}
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}
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pub mod util {
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@ -117,6 +180,6 @@ pub mod util {
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let stop = help(upper)?;
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let step = help(step)?;
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Ok(RustSlice { start, stop, step })
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Ok(RustSlice { int_kind: Int32, start, stop, step })
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}
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}
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