generate signature for foreign symbols

compiler/gen/src/llvm/build.rs

@@ -810,15 +810,29 @@ pub fn build_exp_expr<'a, 'ctx, 'env>(
         Literal(literal) => build_exp_literal(env, literal),
         RunLowLevel(op, symbols) => run_low_level(env, scope, parent, layout, *op, symbols),
 
-        ForeignCall(foreign_symbol, symbols) => {
-            let function = get_foreign_symbol(env, foreign_symbol.clone());
+        ForeignCall {
+            foreign_symbol,
+            arguments,
+            ret_layout,
+        } => {
+            let mut arg_vals: Vec<BasicValueEnum> =
+                Vec::with_capacity_in(arguments.len(), env.arena);
 
-            let mut arg_vals: Vec<BasicValueEnum> = Vec::with_capacity_in(symbols.len(), env.arena);
+            let mut arg_types = Vec::with_capacity_in(arguments.len(), env.arena);
 
-            for arg in symbols.iter() {
-                arg_vals.push(load_symbol(env, scope, arg));
+            for arg in arguments.iter() {
+                let (value, layout) = load_symbol_and_layout(env, scope, arg);
+                arg_vals.push(value);
+                let arg_type =
+                    basic_type_from_layout(env.arena, env.context, layout, env.ptr_bytes);
+                arg_types.push(arg_type);
             }
 
+            let ret_type =
+                basic_type_from_layout(env.arena, env.context, ret_layout, env.ptr_bytes);
+            let function_type = get_fn_type(&ret_type, &arg_types);
+            let function = get_foreign_symbol(env, foreign_symbol.clone(), function_type);
+
             let call = env.builder.build_call(function, arg_vals.as_slice(), "tmp");
 
             // this is a foreign function, use c calling convention
@@ -3424,6 +3438,7 @@ fn cxa_rethrow_exception<'a, 'ctx, 'env>(env: &Env<'a, 'ctx, 'env>) -> BasicValu
 fn get_foreign_symbol<'a, 'ctx, 'env>(
     env: &Env<'a, 'ctx, 'env>,
     foreign_symbol: roc_module::ident::ForeignSymbol,
+    function_type: FunctionType<'ctx>,
 ) -> FunctionValue<'ctx> {
     let module = env.module;
     let context = env.context;
@@ -3433,9 +3448,7 @@ fn get_foreign_symbol<'a, 'ctx, 'env>(
         None => {
             let foreign_function = module.add_function(
                 foreign_symbol.as_str(),
-                context
-                    .struct_type(&[], false)
-                    .fn_type(&[context.i64_type().into()], false),
+                function_type,
                 Some(Linkage::External),
             );
             foreign_function.set_call_conventions(C_CALL_CONV);

compiler/load/src/file.rs

@@ -2309,7 +2309,7 @@ fn fabricate_host_exposed_def<'a>(
     match annotation.typ.shallow_dealias() {
         Type::Function(args, _, _) => {
             for i in 0..args.len() {
-                let name = format!("closure_arg_{}", i);
+                let name = format!("closure_arg_{}_{}", ident, i);
 
                 let arg_symbol = {
                     let ident = name.clone().into();
@@ -2343,7 +2343,7 @@ fn fabricate_host_exposed_def<'a>(
     };
 
     let effect_closure_symbol = {
-        let name = "effect_closure";
+        let name = format!("effect_closure_{}", ident);
 
         let ident = name.clone().into();
         scope

compiler/mono/src/borrow.rs

@@ -374,13 +374,13 @@ impl<'a> BorrowInfState<'a> {
                 self.own_args_using_bools(args, ps);
             }
 
-            ForeignCall(_, args) => {
+            ForeignCall { arguments, .. } => {
                 // very unsure what demand ForeignCall should place upon its arguments
                 self.own_var(z);
 
-                let ps = foreign_borrow_signature(self.arena, args.len());
+                let ps = foreign_borrow_signature(self.arena, arguments.len());
 
-                self.own_args_using_bools(args, ps);
+                self.own_args_using_bools(arguments, ps);
             }
 
             Literal(_) | FunctionPointer(_, _) | RuntimeErrorFunction(_) => {}

compiler/mono/src/inc_dec.rs

@@ -125,8 +125,8 @@ pub fn occuring_variables_expr(expr: &Expr<'_>, result: &mut MutSet<Symbol>) {
         RunLowLevel(_, args) => {
             result.extend(args.iter());
         }
-        ForeignCall(_, args) => {
-            result.extend(args.iter());
+        ForeignCall { arguments, .. } => {
+            result.extend(arguments.iter());
         }
 
         EmptyArray | RuntimeErrorFunction(_) | Literal(_) => {}
@@ -466,9 +466,9 @@ impl<'a> Context<'a> {
                 self.arena.alloc(Stmt::Let(z, v, l, b))
             }
 
-            ForeignCall(_, args) => {
-                let ps = crate::borrow::foreign_borrow_signature(self.arena, args.len());
-                let b = self.add_dec_after_lowlevel(args, ps, b, b_live_vars);
+            ForeignCall { arguments, .. } => {
+                let ps = crate::borrow::foreign_borrow_signature(self.arena, arguments.len());
+                let b = self.add_dec_after_lowlevel(arguments, ps, b, b_live_vars);
 
                 self.arena.alloc(Stmt::Let(z, v, l, b))
             }

compiler/mono/src/ir.rs

@@ -829,7 +829,11 @@ pub enum Expr<'a> {
         args: &'a [Symbol],
     },
     RunLowLevel(LowLevel, &'a [Symbol]),
-    ForeignCall(ForeignSymbol, &'a [Symbol]),
+    ForeignCall {
+        foreign_symbol: ForeignSymbol,
+        arguments: &'a [Symbol],
+        ret_layout: Layout<'a>,
+    },
 
     Tag {
         tag_layout: Layout<'a>,
@@ -944,11 +948,15 @@ impl<'a> Expr<'a> {
                     .text(format!("lowlevel {:?} ", lowlevel))
                     .append(alloc.intersperse(it, " "))
             }
-            ForeignCall(symbol, args) => {
-                let it = args.iter().map(|s| symbol_to_doc(alloc, *s));
+            ForeignCall {
+                foreign_symbol,
+                arguments,
+                ..
+            } => {
+                let it = arguments.iter().map(|s| symbol_to_doc(alloc, *s));
 
                 alloc
-                    .text(format!("foreign {:?} ", symbol.as_str()))
+                    .text(format!("foreign {:?} ", foreign_symbol.as_str()))
                     .append(alloc.intersperse(it, " "))
             }
             Tag {
@@ -3191,7 +3199,11 @@ pub fn with_hole<'a>(
 
             let result = Stmt::Let(
                 assigned,
-                Expr::ForeignCall(foreign_symbol.clone(), arg_symbols),
+                Expr::ForeignCall {
+                    foreign_symbol: foreign_symbol.clone(),
+                    arguments: arg_symbols,
+                    ret_layout: layout.clone(),
+                },
                 layout,
                 hole,
             );
@@ -4035,10 +4047,14 @@ fn substitute_in_expr<'a>(
                 None
             }
         }
-        ForeignCall(symbol, args) => {
+        ForeignCall {
+            foreign_symbol,
+            arguments,
+            ret_layout,
+        } => {
             let mut did_change = false;
             let new_args = Vec::from_iter_in(
-                args.iter().map(|s| match substitute(subs, *s) {
+                arguments.iter().map(|s| match substitute(subs, *s) {
                     None => *s,
                     Some(s) => {
                         did_change = true;
@@ -4051,7 +4067,11 @@ fn substitute_in_expr<'a>(
             if did_change {
                 let args = new_args.into_bump_slice();
 
-                Some(ForeignCall(symbol.clone(), args))
+                Some(ForeignCall {
+                    foreign_symbol: foreign_symbol.clone(),
+                    arguments: args,
+                    ret_layout: ret_layout.clone(),
+                })
             } else {
                 None
             }

examples/effect/Effect.roc

@@ -3,4 +3,4 @@ platform folkertdev/foo
     requires [ main ]
     imports []
     effects
-        { putChar Int -> Effect {} }
+        { putChar Int -> Effect {}, putLine Str -> Effect {} }

examples/effect/Main.roc

@@ -2,7 +2,8 @@ app Main provides [ main ] imports [ Effect ]
 
 main : Effect.Effect {} as Fx
 main =
-    e = Effect.putChar 69
-    d = Effect.putChar 68
 
-    e |> Effect.after \{} -> d
+    Effect.putLine "Hello"
+        |> Effect.after \{} -> Effect.putChar 87
+        # |> Effect.after \{} -> Effect.putLine "orld"
+

examples/effect/platform/src/lib.rs

@@ -1,5 +1,6 @@
 use roc_std::alloca;
 use roc_std::RocCallResult;
+use roc_std::RocStr;
 use std::alloc::Layout;
 use std::time::SystemTime;
 
@@ -25,6 +26,15 @@ pub fn roc_fx_putChar(foo: i64) -> () {
     ()
 }
 
+#[no_mangle]
+pub fn roc_fx_putLine(line: RocStr) -> () {
+    let bytes = line.as_slice();
+    let string = unsafe { std::str::from_utf8_unchecked(bytes) };
+    println!("{}", string);
+
+    ()
+}
+
 unsafe fn call_the_closure(function_pointer: *const u8, closure_data_ptr: *const u8) -> i64 {
     let size = size_Fx() as usize;