Implement wasm_config_new and wasm_engine_new_with_config (#901)

* Implement wasm_config_new and wasm_engine_new_with_config

crates/c-api/src/ext.rs

@@ -0,0 +1,88 @@
+//! This file defines the extern "C" API extension, which are specific
+//! to the wasmtime implementation.
+
+use crate::wasm_config_t;
+use wasmtime::{OptLevel, Strategy};
+
+#[repr(u8)]
+#[derive(Clone)]
+pub enum wasmtime_strategy_t {
+    WASMTIME_STRATEGY_AUTO,
+    WASMTIME_STRATEGY_CRANELIFT,
+    WASMTIME_STRATEGY_LIGHTBEAM,
+}
+
+#[repr(u8)]
+#[derive(Clone)]
+pub enum wasmtime_opt_level_t {
+    WASMTIME_OPT_LEVEL_NONE,
+    WASMTIME_OPT_LEVEL_SPEED,
+    WASMTIME_OPT_LEVEL_SPEED_AND_SIZE,
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_debug_info_set(c: *mut wasm_config_t, enable: bool) {
+    (*c).config.debug_info(enable);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_wasm_threads_set(c: *mut wasm_config_t, enable: bool) {
+    (*c).config.wasm_threads(enable);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_wasm_reference_types_set(
+    c: *mut wasm_config_t,
+    enable: bool,
+) {
+    (*c).config.wasm_reference_types(enable);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_wasm_simd_set(c: *mut wasm_config_t, enable: bool) {
+    (*c).config.wasm_simd(enable);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_wasm_bulk_memory_set(c: *mut wasm_config_t, enable: bool) {
+    (*c).config.wasm_bulk_memory(enable);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_wasm_multi_value_set(c: *mut wasm_config_t, enable: bool) {
+    (*c).config.wasm_multi_value(enable);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_strategy_set(
+    c: *mut wasm_config_t,
+    strategy: wasmtime_strategy_t,
+) {
+    use wasmtime_strategy_t::*;
+    drop((*c).config.strategy(match strategy {
+        WASMTIME_STRATEGY_AUTO => Strategy::Auto,
+        WASMTIME_STRATEGY_CRANELIFT => Strategy::Cranelift,
+        WASMTIME_STRATEGY_LIGHTBEAM => Strategy::Lightbeam,
+    }));
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_cranelift_debug_verifier_set(
+    c: *mut wasm_config_t,
+    enable: bool,
+) {
+    (*c).config.cranelift_debug_verifier(enable);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasmtime_config_cranelift_opt_level_set(
+    c: *mut wasm_config_t,
+    opt_level: wasmtime_opt_level_t,
+) {
+    use wasmtime_opt_level_t::*;
+    (*c).config.cranelift_opt_level(match opt_level {
+        WASMTIME_OPT_LEVEL_NONE => OptLevel::None,
+        WASMTIME_OPT_LEVEL_SPEED => OptLevel::Speed,
+        WASMTIME_OPT_LEVEL_SPEED_AND_SIZE => OptLevel::SpeedAndSize,
+    });
+}