Try #440:

Author: bors[bot]

CHANGELOG.md

@@ -6,6 +6,7 @@ Blocks of changes will separated by version increments.
 
 ## **[Unreleased]**
 
+- [#440](https://github.com/wasmerio/wasmer/pull/440) Fix type mismatch between `wasmer_instance_call` and `wasmer_export_func_*_arity` functions in the runtime C API.
 - [#269](https://github.com/wasmerio/wasmer/pull/269) Add better runtime docs
 - [#432](https://github.com/wasmerio/wasmer/pull/432) Fix returned value of `wasmer_last_error_message` in the runtime C API
 - [#429](https://github.com/wasmerio/wasmer/pull/429) Get wasi::path_filestat_get working for some programs; misc. minor WASI FS improvements

lib/runtime-c-api/src/instance.rs

@@ -125,9 +125,9 @@ pub unsafe extern "C" fn wasmer_instance_call(
     instance: *mut wasmer_instance_t,
     name: *const c_char,
     params: *const wasmer_value_t,
-    params_len: c_int,
+    params_len: uint32_t,
     results: *mut wasmer_value_t,
-    results_len: c_int,
+    results_len: uint32_t,
 ) -> wasmer_result_t {
     if instance.is_null() {
         update_last_error(CApiError {

lib/runtime-c-api/tests/test-exports.c

@@ -60,7 +60,6 @@ int main()
     assert(returns_sig[0] == WASM_I32);
     free(returns_sig);
 
-
     wasmer_value_t param_one;
     param_one.tag = WASM_I32;
     param_one.value.I32 = 7;
@@ -71,7 +70,7 @@ int main()
     wasmer_value_t result_one;
     wasmer_value_t results[] = {result_one};
 
-    wasmer_result_t call_result = wasmer_export_func_call(func, params, 2, results, 1);
+    wasmer_result_t call_result = wasmer_export_func_call(func, params, params_arity, results, returns_arity);
     printf("Call result:  %d\n", call_result);
     printf("Result: %d\n", results[0].value.I32);
     assert(results[0].value.I32 == 15);

lib/runtime-c-api/wasmer.h

@@ -390,9 +390,9 @@ wasmer_result_t wasmer_import_func_returns_arity(const wasmer_import_func_t *fun
 wasmer_result_t wasmer_instance_call(wasmer_instance_t *instance,
                                      const char *name,
                                      const wasmer_value_t *params,
-                                     int params_len,
+                                     uint32_t params_len,
                                      wasmer_value_t *results,
-                                     int results_len);
+                                     uint32_t results_len);
 
 /**
  * Gets the `data` field within the context.

lib/runtime-c-api/wasmer.hh

@@ -313,9 +313,9 @@ wasmer_result_t wasmer_import_func_returns_arity(const wasmer_import_func_t *fun
 wasmer_result_t wasmer_instance_call(wasmer_instance_t *instance,
                                      const char *name,
                                      const wasmer_value_t *params,
-                                     int params_len,
+                                     uint32_t params_len,
                                      wasmer_value_t *results,
-                                     int results_len);
+                                     uint32_t results_len);
 
 /// Gets the `data` field within the context.
 void *wasmer_instance_context_data_get(const wasmer_instance_context_t *ctx);