From 50264e875099e698f2ff5e39fd9fdb04f5ea83db Mon Sep 17 00:00:00 2001
From: David Mak <chmakac@connect.ust.hk>
Date: Mon, 18 Mar 2024 15:51:01 +0800
Subject: [PATCH] core: Add missing unchecked accessors for NDArrayDimsProxy

---
 nac3core/src/codegen/classes.rs | 51 ++++++++++++++++++++++++++-------
 nac3core/src/codegen/expr.rs    | 13 +++++----
 nac3core/src/codegen/numpy.rs   |  8 ++++--
 3 files changed, 52 insertions(+), 20 deletions(-)

diff --git a/nac3core/src/codegen/classes.rs b/nac3core/src/codegen/classes.rs
index 2867b8f1..9c7c2621 100644
--- a/nac3core/src/codegen/classes.rs
+++ b/nac3core/src/codegen/classes.rs
@@ -627,6 +627,26 @@ impl<'ctx> NDArrayDimsProxy<'ctx> {
             .unwrap()
     }
 
+    /// # Safety
+    ///
+    /// This function should be called with a valid index.
+    pub unsafe fn ptr_offset_unchecked(
+        &self,
+        ctx: &mut CodeGenContext<'ctx, '_>,
+        idx: IntValue<'ctx>,
+        name: Option<&str>,
+    ) -> PointerValue<'ctx> {
+        let var_name = name
+            .map(|v| format!("{v}.addr"))
+            .unwrap_or_default();
+
+        ctx.builder.build_in_bounds_gep(
+            self.as_ptr_value(ctx),
+            &[idx],
+            var_name.as_str(),
+        ).unwrap()
+    }
+
     /// Returns the pointer to the size of the `idx`-th dimension.
     pub fn ptr_offset(
         &self,
@@ -650,19 +670,26 @@ impl<'ctx> NDArrayDimsProxy<'ctx> {
             ctx.current_loc,
         );
 
-        let var_name = name
-            .map(|v| format!("{v}.addr"))
-            .unwrap_or_default();
-
         unsafe {
-            ctx.builder.build_in_bounds_gep(
-                self.as_ptr_value(ctx),
-                &[idx],
-                var_name.as_str(),
-            ).unwrap()
+            self.ptr_offset_unchecked(ctx, idx, name)
         }
     }
 
+    /// # Safety
+    ///
+    /// This function should be called with a valid index.
+    pub unsafe fn get_unchecked(
+        &self,
+        ctx: &mut CodeGenContext<'ctx, '_>,
+        idx: IntValue<'ctx>,
+        name: Option<&str>,
+    ) -> IntValue<'ctx> {
+        let ptr = self.ptr_offset_unchecked(ctx, idx, name);
+        ctx.builder.build_load(ptr, name.unwrap_or_default())
+            .map(BasicValueEnum::into_int_value)
+            .unwrap()
+    }
+
     /// Returns the size of the `idx`-th dimension.
     pub fn get(
         &self,
@@ -862,7 +889,9 @@ impl<'ctx> NDArrayDataProxy<'ctx> {
                 .map(BasicValueEnum::into_int_value)
                 .map(|v| ctx.builder.build_int_z_extend_or_bit_cast(v, llvm_usize, "").unwrap())
                 .unwrap();
-            let dim_sz = self.0.dim_sizes().get(ctx, generator, i, None);
+            let dim_sz = unsafe {
+                self.0.dim_sizes().get_unchecked(ctx, i, None)
+            };
 
             let dim_lt = ctx.builder.build_int_compare(
                 IntPredicate::SLT,
@@ -938,7 +967,7 @@ impl<'ctx> NDArrayDataProxy<'ctx> {
                 let (dim_idx, dim_sz) = unsafe {
                     (
                         indices.data().get_unchecked(ctx, i, None).into_int_value(),
-                        self.0.dim_sizes().get(ctx, generator, i, None),
+                        self.0.dim_sizes().get_unchecked(ctx, i, None),
                     )
                 };
 
diff --git a/nac3core/src/codegen/expr.rs b/nac3core/src/codegen/expr.rs
index b4ccef9d..5711a6a1 100644
--- a/nac3core/src/codegen/expr.rs
+++ b/nac3core/src/codegen/expr.rs
@@ -1300,12 +1300,13 @@ fn gen_ndarray_subscript_expr<'ctx, G: CodeGenerator>(
         ndarray.create_dim_sizes(ctx, llvm_usize, ndarray_num_dims);
 
         let ndarray_num_dims = ndarray.load_ndims(ctx);
-        let v_dims_src_ptr = v.dim_sizes().ptr_offset(
-            ctx,
-            generator,
-            llvm_usize.const_int(1, false),
-            None,
-        );
+        let v_dims_src_ptr = unsafe {
+            v.dim_sizes().ptr_offset_unchecked(
+                ctx,
+                llvm_usize.const_int(1, false),
+                None,
+            )
+        };
         call_memcpy_generic(
             ctx,
             ndarray.dim_sizes().as_ptr_value(ctx),
diff --git a/nac3core/src/codegen/numpy.rs b/nac3core/src/codegen/numpy.rs
index 70298904..3f227fe5 100644
--- a/nac3core/src/codegen/numpy.rs
+++ b/nac3core/src/codegen/numpy.rs
@@ -150,7 +150,9 @@ fn create_ndarray_dyn_shape<'ctx, 'a, V, LenFn, DataFn>(
                 .build_int_z_extend(shape_dim, llvm_usize, "")
                 .unwrap();
 
-            let ndarray_pdim = ndarray.dim_sizes().ptr_offset(ctx, generator, i, None);
+            let ndarray_pdim = unsafe {
+                ndarray.dim_sizes().ptr_offset_unchecked(ctx, i, None)
+            };
 
             ctx.builder.build_store(ndarray_pdim, shape_dim).unwrap();
 
@@ -620,8 +622,8 @@ fn ndarray_copy_impl<'ctx>(
         |_, ctx, shape| {
             Ok(shape.load_ndims(ctx))
         },
-        |generator, ctx, shape, idx| {
-            Ok(shape.dim_sizes().get(ctx, generator, idx, None))
+        |_, ctx, shape, idx| {
+            unsafe { Ok(shape.dim_sizes().get_unchecked(ctx, idx, None)) }
         },
     )?;