wasm: support calling alias'd function pointers

When lowering a decl value we verify whether its owner decl index
equals to the decl index of the decl being lowered. When this is not
the case, we are lowering an alias. So instead, we will now lower
the owner decl instead and call its symbol to ensure its type
is being correctly generated.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/arch/wasm/CodeGen.zig b/src/arch/wasm/CodeGen.zig
index 9a19ca439c..aa44dc2bc8 100644
--- a/src/arch/wasm/CodeGen.zig
+++ b/src/arch/wasm/CodeGen.zig
@@ -3008,6 +3008,17 @@ fn lowerDeclRefValue(func: *CodeGen, tv: TypedValue, decl_index: Module.Decl.Ind
     }
 
     const decl = mod.declPtr(decl_index);
+    // check if decl is an alias to a function, in which case we
+    // want to lower the actual decl, rather than the alias itself.
+    if (decl.val.getFunction(mod)) |func_val| {
+        if (func_val.owner_decl != decl_index) {
+            return func.lowerDeclRefValue(tv, func_val.owner_decl, offset);
+        }
+    } else if (decl.val.getExternFunc(mod)) |func_val| {
+        if (func_val.decl != decl_index) {
+            return func.lowerDeclRefValue(tv, func_val.decl, offset);
+        }
+    }
     if (decl.ty.zigTypeTag(mod) != .Fn and !decl.ty.hasRuntimeBitsIgnoreComptime(mod)) {
         return WValue{ .imm32 = 0xaaaaaaaa };
     }