repl: rename Wasm32TestResult -> Wasm32Result

compiler/gen_wasm/src/wasm32_result.rs

@@ -0,0 +1,183 @@
+use bumpalo::collections::Vec;
+
+use crate::wasm32_sized::Wasm32Sized;
+use crate::wasm_module::{
+    linking::SymInfo, linking::WasmObjectSymbol, Align, CodeBuilder, Export, ExportType, LocalId,
+    Signature, ValueType, WasmModule,
+};
+use roc_std::{RocDec, RocList, RocOrder, RocStr};
+
+pub trait Wasm32Result {
+    fn insert_wrapper<'a>(
+        arena: &'a bumpalo::Bump,
+        module: &mut WasmModule<'a>,
+        wrapper_name: &str,
+        main_function_index: u32,
+    ) {
+        let index = module.import.function_count
+            + module.code.preloaded_count
+            + module.code.code_builders.len() as u32;
+
+        module.add_function_signature(Signature {
+            param_types: Vec::with_capacity_in(0, arena),
+            ret_type: Some(ValueType::I32),
+        });
+
+        module.export.append(Export {
+            name: arena.alloc_slice_copy(wrapper_name.as_bytes()),
+            ty: ExportType::Func,
+            index,
+        });
+
+        let linker_symbol = SymInfo::Function(WasmObjectSymbol::Defined {
+            flags: 0,
+            index,
+            name: wrapper_name.to_string(),
+        });
+        module.linking.symbol_table.push(linker_symbol);
+
+        let mut code_builder = CodeBuilder::new(arena);
+        Self::build_wrapper_body(&mut code_builder, main_function_index);
+        module.code.code_builders.push(code_builder);
+    }
+
+    fn build_wrapper_body(code_builder: &mut CodeBuilder, main_function_index: u32);
+}
+
+macro_rules! build_wrapper_body_primitive {
+    ($store_instruction: ident, $align: expr) => {
+        fn build_wrapper_body(code_builder: &mut CodeBuilder, main_function_index: u32) {
+            let frame_pointer_id = LocalId(0);
+            let frame_pointer = Some(frame_pointer_id);
+            let local_types = &[ValueType::I32];
+            let frame_size = 8;
+            // Main's symbol index is the same as its function index, since the first symbols we created were for procs
+            let main_symbol_index = main_function_index;
+
+            code_builder.get_local(frame_pointer_id);
+            code_builder.call(main_function_index, main_symbol_index, 0, true);
+            code_builder.$store_instruction($align, 0);
+            code_builder.get_local(frame_pointer_id);
+
+            code_builder.build_fn_header_and_footer(local_types, frame_size, frame_pointer);
+        }
+    };
+}
+
+macro_rules! wasm_result_primitive {
+    ($type_name: ident, $store_instruction: ident, $align: expr) => {
+        impl Wasm32Result for $type_name {
+            build_wrapper_body_primitive!($store_instruction, $align);
+        }
+    };
+}
+
+fn build_wrapper_body_stack_memory(
+    code_builder: &mut CodeBuilder,
+    main_function_index: u32,
+    size: usize,
+) {
+    let local_id = LocalId(0);
+    let local_types = &[ValueType::I32];
+    let frame_pointer = Some(local_id);
+    // Main's symbol index is the same as its function index, since the first symbols we created were for procs
+    let main_symbol_index = main_function_index;
+
+    code_builder.get_local(local_id);
+    code_builder.call(main_function_index, main_symbol_index, 0, true);
+    code_builder.get_local(local_id);
+    code_builder.build_fn_header_and_footer(local_types, size as i32, frame_pointer);
+}
+
+macro_rules! wasm_result_stack_memory {
+    ($type_name: ident) => {
+        impl Wasm32Result for $type_name {
+            fn build_wrapper_body(code_builder: &mut CodeBuilder, main_function_index: u32) {
+                build_wrapper_body_stack_memory(
+                    code_builder,
+                    main_function_index,
+                    $type_name::ACTUAL_WIDTH,
+                )
+            }
+        }
+    };
+}
+
+wasm_result_primitive!(bool, i32_store8, Align::Bytes1);
+wasm_result_primitive!(RocOrder, i32_store8, Align::Bytes1);
+
+wasm_result_primitive!(u8, i32_store8, Align::Bytes1);
+wasm_result_primitive!(i8, i32_store8, Align::Bytes1);
+wasm_result_primitive!(u16, i32_store16, Align::Bytes2);
+wasm_result_primitive!(i16, i32_store16, Align::Bytes2);
+wasm_result_primitive!(u32, i32_store, Align::Bytes4);
+wasm_result_primitive!(i32, i32_store, Align::Bytes4);
+wasm_result_primitive!(u64, i64_store, Align::Bytes8);
+wasm_result_primitive!(i64, i64_store, Align::Bytes8);
+wasm_result_primitive!(usize, i32_store, Align::Bytes4);
+
+wasm_result_primitive!(f32, f32_store, Align::Bytes4);
+wasm_result_primitive!(f64, f64_store, Align::Bytes8);
+
+wasm_result_stack_memory!(u128);
+wasm_result_stack_memory!(i128);
+wasm_result_stack_memory!(RocDec);
+wasm_result_stack_memory!(RocStr);
+
+impl<T: Wasm32Result> Wasm32Result for RocList<T> {
+    fn build_wrapper_body(code_builder: &mut CodeBuilder, main_function_index: u32) {
+        build_wrapper_body_stack_memory(code_builder, main_function_index, 12)
+    }
+}
+
+impl<T: Wasm32Result> Wasm32Result for &'_ T {
+    build_wrapper_body_primitive!(i32_store, Align::Bytes4);
+}
+
+impl<T, const N: usize> Wasm32Result for [T; N]
+where
+    T: Wasm32Result + Wasm32Sized,
+{
+    fn build_wrapper_body(code_builder: &mut CodeBuilder, main_function_index: u32) {
+        build_wrapper_body_stack_memory(code_builder, main_function_index, N * T::ACTUAL_WIDTH)
+    }
+}
+
+impl Wasm32Result for () {
+    fn build_wrapper_body(code_builder: &mut CodeBuilder, main_function_index: u32) {
+        // Main's symbol index is the same as its function index, since the first symbols we created were for procs
+        let main_symbol_index = main_function_index;
+        code_builder.call(main_function_index, main_symbol_index, 0, false);
+        code_builder.get_global(0);
+        code_builder.build_fn_header_and_footer(&[], 0, None);
+    }
+}
+
+impl<T, U> Wasm32Result for (T, U)
+where
+    T: Wasm32Result + Wasm32Sized,
+    U: Wasm32Result + Wasm32Sized,
+{
+    fn build_wrapper_body(code_builder: &mut CodeBuilder, main_function_index: u32) {
+        build_wrapper_body_stack_memory(
+            code_builder,
+            main_function_index,
+            T::ACTUAL_WIDTH + U::ACTUAL_WIDTH,
+        )
+    }
+}
+
+impl<T, U, V> Wasm32Result for (T, U, V)
+where
+    T: Wasm32Result + Wasm32Sized,
+    U: Wasm32Result + Wasm32Sized,
+    V: Wasm32Result + Wasm32Sized,
+{
+    fn build_wrapper_body(code_builder: &mut CodeBuilder, main_function_index: u32) {
+        build_wrapper_body_stack_memory(
+            code_builder,
+            main_function_index,
+            T::ACTUAL_WIDTH + U::ACTUAL_WIDTH + V::ACTUAL_WIDTH,
+        )
+    }
+}