setup before zig work

compiler/builtins/bitcode/src/list.zig

@@ -7,6 +7,7 @@ const Allocator = mem.Allocator;
 const TAG_WIDTH = 8;
 
 const EqFn = fn (?[*]u8, ?[*]u8) callconv(.C) bool;
+const CompareFn = fn (?[*]u8, ?[*]u8, ?[*]u8) callconv(.C) u8;
 const Opaque = ?[*]u8;
 
 const Inc = fn (?[*]u8) callconv(.C) void;
@@ -688,3 +689,7 @@ fn listRangeHelp(allocator: *Allocator, comptime T: type, low: T, high: T) RocLi
         },
     }
 }
+
+pub fn listSortWith(list: RocList, transform: Opaque, wrapper: CompareFn, alignment: usize, element_width: usize) callconv(.C) RocList {
+    return list;
+}

compiler/builtins/bitcode/src/main.zig

@@ -20,6 +20,7 @@ comptime {
     exportListFn(list.listRepeat, "repeat");
     exportListFn(list.listAppend, "append");
     exportListFn(list.listRange, "range");
+    exportListFn(list.listSortWith, "sort_with");
 }
 
 // Dict Module

compiler/gen/src/llvm/bitcode.rs

@@ -2,11 +2,15 @@ use crate::debug_info_init;
 use crate::llvm::build::{set_name, Env, FAST_CALL_CONV};
 use crate::llvm::convert::basic_type_from_layout;
 use crate::llvm::refcounting::{decrement_refcount_layout, increment_refcount_layout, Mode};
-use inkwell::attributes::{Attribute, AttributeLoc};
+use either::Either;
 /// Helpers for interacting with the zig that generates bitcode
 use inkwell::types::{BasicType, BasicTypeEnum};
 use inkwell::values::{BasicValueEnum, CallSiteValue, FunctionValue, InstructionValue};
 use inkwell::AddressSpace;
+use inkwell::{
+    attributes::{Attribute, AttributeLoc},
+    values::PointerValue,
+};
 use roc_module::symbol::Symbol;
 use roc_mono::layout::{Layout, LayoutIds};
 
@@ -383,3 +387,95 @@ pub fn build_eq_wrapper<'a, 'ctx, 'env>(
 
     function_value
 }
+
+pub fn build_compare_wrapper<'a, 'ctx, 'env>(
+    env: &Env<'a, 'ctx, 'env>,
+    layout_ids: &mut LayoutIds<'a>,
+    layout: &Layout<'a>,
+) -> FunctionValue<'ctx> {
+    let block = env.builder.get_insert_block().expect("to be in a function");
+    let di_location = env.builder.get_current_debug_location().unwrap();
+
+    let symbol = Symbol::COMPARE_REF;
+    let fn_name = layout_ids
+        .get(symbol, &layout)
+        .to_symbol_string(symbol, &env.interns);
+
+    let function_value = match env.module.get_function(fn_name.as_str()) {
+        Some(function_value) => function_value,
+        None => {
+            let arg_type = env.context.i8_type().ptr_type(AddressSpace::Generic);
+
+            let function_value = crate::llvm::refcounting::build_header_help(
+                env,
+                &fn_name,
+                env.context.i8_type().into(),
+                &[arg_type.into(), arg_type.into(), arg_type.into()],
+            );
+
+            let kind_id = Attribute::get_named_enum_kind_id("alwaysinline");
+            debug_assert!(kind_id > 0);
+            let attr = env.context.create_enum_attribute(kind_id, 1);
+            function_value.add_attribute(AttributeLoc::Function, attr);
+
+            let entry = env.context.append_basic_block(function_value, "entry");
+            env.builder.position_at_end(entry);
+
+            debug_info_init!(env, function_value);
+
+            let mut it = function_value.get_param_iter();
+            let function_ptr = it.next().unwrap().into_pointer_value();
+            let value_ptr1 = it.next().unwrap().into_pointer_value();
+            let value_ptr2 = it.next().unwrap().into_pointer_value();
+
+            set_name(
+                function_ptr.into(),
+                Symbol::ARG_1.ident_string(&env.interns),
+            );
+            set_name(value_ptr1.into(), Symbol::ARG_2.ident_string(&env.interns));
+            set_name(value_ptr2.into(), Symbol::ARG_3.ident_string(&env.interns));
+
+            let value_type = basic_type_from_layout(env.arena, env.context, layout, env.ptr_bytes);
+            let function_type = env
+                .context
+                .i8_type()
+                .fn_type(&[value_type, value_type], false)
+                .ptr_type(AddressSpace::Generic);
+            let value_ptr_type = value_type.ptr_type(AddressSpace::Generic);
+
+            let function_cast =
+                env.builder
+                    .build_bitcast(function_ptr, function_type, "load_opaque");
+            let value_cast1 = env
+                .builder
+                .build_bitcast(value_ptr1, value_ptr_type, "load_opaque")
+                .into_pointer_value();
+
+            let value_cast2 = env
+                .builder
+                .build_bitcast(value_ptr2, value_ptr_type, "load_opaque")
+                .into_pointer_value();
+
+            let value1 = env.builder.build_load(value_cast1, "load_opaque");
+            let value2 = env.builder.build_load(value_cast2, "load_opaque");
+
+            let call = env.builder.build_call(
+                function_cast.into_pointer_value(),
+                &[value1, value2],
+                "call_user_defined_function",
+            );
+            // call.set_call_convention(user_defined_function.get_call_conventions());
+            let result = call.try_as_basic_value().left().unwrap();
+
+            env.builder.build_return(Some(&result));
+
+            function_value
+        }
+    };
+
+    env.builder.position_at_end(block);
+    env.builder
+        .set_current_debug_location(env.context, di_location);
+
+    function_value
+}

compiler/gen/src/llvm/build.rs

@@ -7,8 +7,8 @@ use crate::llvm::build_hash::generic_hash;
 use crate::llvm::build_list::{
     allocate_list, empty_list, empty_polymorphic_list, list_append, list_concat, list_contains,
     list_get_unsafe, list_join, list_keep_errs, list_keep_if, list_keep_oks, list_len, list_map,
-    list_map2, list_map3, list_map_with_index, list_prepend, list_repeat, list_reverse, list_set,
+    list_map2, list_map3, list_map_with_index, list_prepend, list_range, list_repeat, list_reverse,
-    list_single, list_sort_with,
+    list_set, list_single, list_sort_with, list_walk_help,
 };
 use crate::llvm::build_str::{
     str_concat, str_count_graphemes, str_ends_with, str_from_float, str_from_int, str_from_utf8,

compiler/gen/src/llvm/build_list.rs

@@ -1,7 +1,7 @@
 #![allow(clippy::too_many_arguments)]
 use crate::llvm::bitcode::{
-    build_dec_wrapper, build_eq_wrapper, build_inc_wrapper, build_transform_caller,
+    build_compare_wrapper, build_dec_wrapper, build_eq_wrapper, build_inc_wrapper,
-    call_bitcode_fn, call_void_bitcode_fn,
+    build_transform_caller, call_bitcode_fn, call_void_bitcode_fn,
 };
 use crate::llvm::build::{
     allocate_with_refcount_help, cast_basic_basic, complex_bitcast, Env, InPlace,
@@ -1141,40 +1141,23 @@ pub fn list_sort_with<'a, 'ctx, 'env>(
     list: BasicValueEnum<'ctx>,
     element_layout: &Layout<'a>,
 ) -> BasicValueEnum<'ctx> {
-    // TODO: decide between returning void pointer or u8 from function passed in.
-    // TODO: implement soriting in zig
     let builder = env.builder;
 
-    let return_layout = match transform_layout {
+    let u9_ptr = env.context.i8_type().ptr_type(AddressSpace::Generic);
-        Layout::FunctionPointer(_, ret) => ret,
-        Layout::Closure(_, _, ret) => ret,
-        _ => unreachable!("not a callable layout"),
-    };
-
-    let u8_ptr = env.context.i8_type().ptr_type(AddressSpace::Generic);
 
     let list_i128 = complex_bitcast(env.builder, list, env.context.i128_type().into(), "to_i128");
 
     let transform_ptr = builder.build_alloca(transform.get_type(), "transform_ptr");
     env.builder.build_store(transform_ptr, transform);
 
-    let stepper_caller = build_transform_caller(
+    let compare_wrapper = build_compare_wrapper(env, layout_ids, element_layout)
-        env,
-        layout_ids,
-        transform_layout,
-        &[*element_layout, *element_layout],
-    )
         .as_global_value()
         .as_pointer_value();
 
-    let old_element_width = env
+    let element_width = env
         .ptr_int()
         .const_int(element_layout.stack_size(env.ptr_bytes) as u64, false);
 
-    let new_element_width = env
-        .ptr_int()
-        .const_int(return_layout.stack_size(env.ptr_bytes) as u64, false);
-
     let alignment = element_layout.alignment_bytes(env.ptr_bytes);
     let alignment_iv = env.ptr_int().const_int(alignment as u64, false);
 
@@ -1184,10 +1167,9 @@ pub fn list_sort_with<'a, 'ctx, 'env>(
             list_i128,
             env.builder
                 .build_bitcast(transform_ptr, u8_ptr, "to_opaque"),
-            stepper_caller.into(),
+            compare_wrapper.into(),
             alignment_iv.into(),
-            old_element_width.into(),
+            element_width.into(),
-            new_element_width.into(),
         ],
         bitcode::LIST_SORT_WITH,
     );

compiler/module/src/symbol.rs

@@ -756,6 +756,8 @@ define_builtins! {
 
         // A caller (wrapper) that we pass to zig for it to be able to call Roc functions
         20 ZIG_FUNCTION_CALLER: "#zig_function_caller"
+
+        21 COMPARE_REF: "#compare_ref" // TODO: <- a nice comment
     }
     1 NUM: "Num" => {
         0 NUM_NUM: "Num" imported // the Num.Num type alias