capi: find_exported_function

Author: gumb0

include/fizzy/fizzy.h

@@ -71,6 +71,9 @@ struct FizzyModule* fizzy_parse(const uint8_t* wasm_binary, size_t wasm_binary_s
 /// Should be called unless @p module was passed to fizzy_instantiate.
 void fizzy_free_module(struct FizzyModule* module);
 
+bool fizzy_find_exported_function(
+    const struct FizzyModule* module, const char* name, uint32_t* out_func_idx);
+
 /// Instantiate a module.
 /// Takes ownership of module, i.e. @p module is invalidated after this call.
 ///

lib/fizzy/capi.cpp

@@ -21,6 +21,11 @@ inline fizzy::Module* unwrap(FizzyModule* module) noexcept
     return reinterpret_cast<fizzy::Module*>(module);
 }
 
+inline const fizzy::Module* unwrap(const FizzyModule* module) noexcept
+{
+    return reinterpret_cast<const fizzy::Module*>(module);
+}
+
 inline FizzyValue wrap(fizzy::Value value) noexcept
 {
     return fizzy::bit_cast<FizzyValue>(value);
@@ -108,6 +113,17 @@ void fizzy_free_module(FizzyModule* module)
     delete unwrap(module);
 }
 
+bool fizzy_find_exported_function(
+    const struct FizzyModule* module, const char* name, uint32_t* out_func_idx)
+{
+    const auto optional_func_idx = fizzy::find_exported_function(*unwrap(module), name);
+    if (!optional_func_idx)
+        return false;
+
+    *out_func_idx = *optional_func_idx;
+    return true;
+}
+
 FizzyInstance* fizzy_instantiate(FizzyModule* module,
     const FizzyExternalFunction* imported_functions, size_t imported_functions_size)
 {