Add get exports from instance

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

@@ -5,6 +5,7 @@ use libc::{c_char, c_int, int32_t, int64_t, uint32_t, uint8_t};
 use std::cell::RefCell;
 use std::error::Error;
 use std::ffi::CStr;
+use std::ffi::CString;
 use std::fmt;
 use std::slice;
 use std::str;
@@ -75,6 +76,10 @@ pub struct wasmer_memory_t();
 #[derive(Clone)]
 pub struct wasmer_table_t();
 
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_func_t();
+
 #[repr(C)]
 #[derive(Clone)]
 pub struct wasmer_global_t();
@@ -85,6 +90,47 @@ pub struct wasmer_limits_t {
     pub max: uint32_t,
 }
 
+#[repr(C)]
+pub struct wasmer_func_signature {
+    pub params: *const wasmer_value_tag,
+    pub params_len: c_int,
+    pub returns: *const wasmer_value_tag,
+    pub returns_len: c_int,
+}
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_import {
+    tag: wasmer_import_export_kind,
+    value: wasmer_import_export_value,
+}
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_export_t;
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_exports_t;
+
+#[repr(u32)]
+#[derive(Clone)]
+pub enum wasmer_import_export_kind {
+    WASM_FUNCTION,
+    WASM_GLOBAL,
+    WASM_MEMORY,
+    WASM_TABLE,
+}
+
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub union wasmer_import_export_value {
+    func: *const wasmer_func_t,
+    table: *const wasmer_table_t,
+    memory: *const wasmer_memory_t,
+    global: *const wasmer_global_t,
+}
+
 /// Returns true for valid wasm bytes and false for invalid bytes
 #[allow(clippy::cast_ptr_alignment)]
 #[no_mangle]
@@ -413,7 +459,6 @@ pub unsafe extern "C" fn wasmer_instance_call(
     Box::into_raw(instance);
     match result {
         Ok(results_vec) => {
-            println!("Call Res: {:?}", results_vec);
             if results_vec.len() > 0 {
                 let ret = match results_vec[0] {
                     Value::I32(x) => wasmer_value_t {
@@ -444,6 +489,83 @@ pub unsafe extern "C" fn wasmer_instance_call(
     }
 }
 
+/// Gets Exports for the given instance
+///
+/// The caller owns the object and should call `wasmer_exports_destroy` to free it.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_instance_exports(
+    instance: *mut wasmer_instance_t,
+    exports: *mut *mut wasmer_exports_t,
+) {
+    let mut instance = unsafe { Box::from_raw(instance as *mut Instance) };
+    let named_exports: Box<NamedExports> =
+        Box::new(NamedExports(instance.exports().map(|e| e.into()).collect()));
+    unsafe { *exports = Box::into_raw(named_exports) as *mut wasmer_exports_t };
+    Box::into_raw(instance);
+}
+
+pub struct NamedExports(Vec<NamedExport>);
+
+/// Frees the memory for the given exports
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_exports_destroy(exports: *mut wasmer_exports_t) {
+    if !exports.is_null() {
+        drop(unsafe { Box::from_raw(exports as *mut NamedExports) });
+    }
+}
+
+/// Gets the length of the exports
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_exports_len(exports: *mut wasmer_exports_t) -> c_int {
+    if exports.is_null() {
+        return 0;
+    }
+    (*(exports as *mut NamedExports)).0.len() as c_int
+}
+
+/// Gets wasmer_export by index
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_exports_get(
+    exports: *mut wasmer_exports_t,
+    idx: c_int,
+) -> *mut wasmer_export_t {
+    if exports.is_null() {
+        return ptr::null_mut();
+    }
+    let mut named_exports = unsafe { Box::from_raw(exports as *mut NamedExports) };
+    let ptr = &mut (*named_exports).0[idx as usize] as *mut NamedExport as *mut wasmer_export_t;
+    Box::into_raw(named_exports);
+    ptr
+}
+
+/// Gets wasmer_export kind
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_kind(
+    export: *mut wasmer_export_t,
+) -> wasmer_import_export_kind {
+    let named_export = &*(export as *mut NamedExport);
+    match named_export.export {
+        Export::Table(_) => wasmer_import_export_kind::WASM_TABLE,
+        Export::Function { .. } => wasmer_import_export_kind::WASM_FUNCTION,
+        Export::Global(_) => wasmer_import_export_kind::WASM_GLOBAL,
+        Export::Memory(_) => wasmer_import_export_kind::WASM_MEMORY,
+    }
+}
+
+///// Gets wasmer_export func
+//#[no_mangle]
+//pub unsafe extern "C" fn wasmer_export_name(export: *mut wasmer_export_t) {
+//    if exports.is_null() {
+//        return ptr::null_mut();
+//    }
+//    let named_export = &*(export as *mut NamedExport);
+//}
+
 /// Registers a `func` with provided `name` and `namespace` into the ImportObject.
 ///
 /// Returns `wasmer_result_t::WASMER_OK` upon success.
@@ -606,6 +728,12 @@ impl From<wasmer_value_tag> for Type {
     }
 }
 
+impl From<(std::string::String, wasmer_runtime_core::export::Export)> for NamedExport {
+    fn from((name, export): (String, Export)) -> Self {
+        NamedExport { name, export }
+    }
+}
+
 // Error reporting
 
 thread_local! {
@@ -699,3 +827,8 @@ impl fmt::Display for CApiError {
 }
 
 impl Error for CApiError {}
+
+struct NamedExport {
+    name: String,
+    export: Export,
+}

lib/runtime-c-api/tests/.gitignore

@@ -10,6 +10,7 @@ compile_commands.json
 CTestTestfile.cmake
 _deps
 test-globals
+test-exports
 test-instantiate
 test-import-function
 test-memory

lib/runtime-c-api/tests/CMakeLists.txt

@@ -1,6 +1,7 @@
 cmake_minimum_required (VERSION 2.6)
 project (WasmerCApiTests)
 
+add_executable(test-exports test-exports.c)
 add_executable(test-globals test-globals.c)
 add_executable(test-instantiate test-instantiate.c)
 add_executable(test-import-function test-import-function.c)
@@ -17,6 +18,8 @@ if(NOT WASMER_LIB)
     message(FATAL_ERROR "wasmer library not found")
 endif()
 
+target_link_libraries(test-exports
+        general ${WASMER_LIB})
 target_link_libraries(test-globals
         general ${WASMER_LIB})
 target_link_libraries(test-instantiate
@@ -31,6 +34,7 @@ target_link_libraries(test-tables
         general ${WASMER_LIB})
 
 enable_testing()
+add_test(test-exports test-exports)
 add_test(test-globals test-globals)
 add_test(test-instantiate test-instantiate)
 add_test(test-import-function test-import-function)

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

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include "../wasmer.h"
+#include <assert.h>
+#include <stdint.h>
+
+int main()
+{
+    wasmer_import_object_t *import_object = wasmer_import_object_new();
+
+    // Read the wasm file bytes
+    FILE *file = fopen("sum.wasm", "r");
+    fseek(file, 0, SEEK_END);
+    long len = ftell(file);
+    uint8_t *bytes = malloc(len);
+    fseek(file, 0, SEEK_SET);
+    fread(bytes, 1, len, file);
+    fclose(file);
+
+    wasmer_instance_t *instance = NULL;
+    wasmer_result_t compile_result = wasmer_instantiate(&instance, bytes, len, import_object);
+    printf("Compile result:  %d\n", compile_result);
+    assert(compile_result == WASMER_OK);
+
+    wasmer_exports_t *exports = NULL;
+    wasmer_instance_exports(instance, &exports);
+
+    int exports_len = wasmer_exports_len(exports);
+    printf("exports_len:  %d\n", exports_len);
+    assert(exports_len == 1);
+
+    wasmer_export_t *export = wasmer_exports_get(exports, 0);
+
+    wasmer_import_export_kind kind = wasmer_export_kind(export);
+    assert(kind == WASM_FUNCTION);
+
+    printf("Destroy instance\n");
+    wasmer_instance_destroy(instance);
+    printf("Destroy import object\n");
+    wasmer_import_object_destroy(import_object);
+    printf("Destroy exports\n");
+    wasmer_exports_destroy(exports);
+    return 0;
+}

lib/runtime-c-api/tests/test-import-function.c

@@ -8,11 +8,13 @@ static memory_len = 0;
 static ptr_len = 0;
 static char actual_str[14] = {};
 
-void print_str(int32_t ptr, int32_t len, wasmer_instance_context_t *ctx) {
+void print_str(int32_t ptr, int32_t len, wasmer_instance_context_t *ctx)
+{
     wasmer_memory_t *memory = wasmer_instance_context_memory(ctx, 0);
     uint32_t mem_len = wasmer_memory_length(memory);
     uint8_t *mem_bytes = wasmer_memory_data(memory);
-    for(int32_t idx = 0; idx < len; idx++){
+    for (int32_t idx = 0; idx < len; idx++)
+    {
         actual_str[idx] = mem_bytes[ptr + idx];
     }
     actual_str[13] = '\0';
@@ -54,8 +56,8 @@ int main()
     assert(ptr_len == 13);
     assert(0 == strcmp(actual_str, "Hello, World!"));
 
-    printf("Destroy instance\n");
-    wasmer_instance_destroy(instance);
+    // printf("Destroy instance\n");
+    // wasmer_instance_destroy(instance);
     printf("Destroy import object\n");
     wasmer_import_object_destroy(import_object);
     return 0;

lib/runtime-c-api/wasmer.h

@@ -6,6 +6,14 @@
 #include <stdint.h>
 #include <stdlib.h>
 
+enum wasmer_import_export_kind {
+  WASM_FUNCTION,
+  WASM_GLOBAL,
+  WASM_MEMORY,
+  WASM_TABLE,
+};
+typedef uint32_t wasmer_import_export_kind;
+
 typedef enum {
   WASMER_OK = 1,
   WASMER_ERROR = 2,
@@ -27,6 +35,14 @@ typedef struct wasmer_instance_t wasmer_instance_t;
 
 typedef struct {
 
+} wasmer_export_t;
+
+typedef struct {
+
+} wasmer_exports_t;
+
+typedef struct {
+
 } wasmer_global_t;
 
 typedef union {
@@ -59,6 +75,26 @@ typedef struct {
 
 } wasmer_table_t;
 
+/**
+ * Gets wasmer_export kind
+ */
+wasmer_import_export_kind wasmer_export_kind(wasmer_export_t *export_);
+
+/**
+ * Frees the memory for the given exports
+ */
+void wasmer_exports_destroy(wasmer_exports_t *exports);
+
+/**
+ * Gets wasmer_export by index
+ */
+wasmer_export_t *wasmer_exports_get(wasmer_exports_t *exports, int idx);
+
+/**
+ * Gets the length of the exports
+ */
+int wasmer_exports_len(wasmer_exports_t *exports);
+
 /**
  * Frees memory for the given Global
  */
@@ -137,6 +173,12 @@ const wasmer_memory_t *wasmer_instance_context_memory(wasmer_instance_context_t
  */
 void wasmer_instance_destroy(wasmer_instance_t *instance);
 
+/**
+ * Gets Exports for the given instance
+ * The caller owns the object and should call `wasmer_exports_destroy` to free it.
+ */
+void wasmer_instance_exports(wasmer_instance_t *instance, wasmer_exports_t **exports);
+
 /**
  * Creates a new Instance from the given wasm bytes and imports.
  * Returns `wasmer_result_t::WASMER_OK` upon success.

lib/runtime-c-api/wasmer.hh

@@ -5,6 +5,13 @@
 #include <cstdint>
 #include <cstdlib>
 
+enum class wasmer_import_export_kind : uint32_t {
+  WASM_FUNCTION,
+  WASM_GLOBAL,
+  WASM_MEMORY,
+  WASM_TABLE,
+};
+
 enum class wasmer_result_t {
   WASMER_OK = 1,
   WASMER_ERROR = 2,
@@ -23,6 +30,14 @@ struct wasmer_instance_context_t;
 
 struct wasmer_instance_t;
 
+struct wasmer_export_t {
+
+};
+
+struct wasmer_exports_t {
+
+};
+
 struct wasmer_global_t {
 
 };
@@ -59,6 +74,18 @@ struct wasmer_table_t {
 
 extern "C" {
 
+/// Gets wasmer_export kind
+wasmer_import_export_kind wasmer_export_kind(wasmer_export_t *export_);
+
+/// Frees the memory for the given exports
+void wasmer_exports_destroy(wasmer_exports_t *exports);
+
+/// Gets wasmer_export by index
+wasmer_export_t *wasmer_exports_get(wasmer_exports_t *exports, int idx);
+
+/// Gets the length of the exports
+int wasmer_exports_len(wasmer_exports_t *exports);
+
 /// Frees memory for the given Global
 void wasmer_global_destroy(wasmer_global_t *global);
 
@@ -115,6 +142,10 @@ const wasmer_memory_t *wasmer_instance_context_memory(wasmer_instance_context_t
 /// Frees memory for the given Instance
 void wasmer_instance_destroy(wasmer_instance_t *instance);
 
+/// Gets Exports for the given instance
+/// The caller owns the object and should call `wasmer_exports_destroy` to free it.
+void wasmer_instance_exports(wasmer_instance_t *instance, wasmer_exports_t **exports);
+
 /// Creates a new Instance from the given wasm bytes and imports.
 /// Returns `wasmer_result_t::WASMER_OK` upon success.
 /// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`