First working version of LLVM in Windows

lib/llvm-backend/src/structs.rs

@@ -0,0 +1,39 @@
+use libc::c_char;
+
+use wasmer_runtime_core::vm;
+
+#[repr(C)]
+pub struct LLVMModule {
+    _private: [u8; 0],
+}
+
+#[allow(non_camel_case_types, dead_code)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[repr(C)]
+pub enum MemProtect {
+    NONE,
+    READ,
+    READ_WRITE,
+    READ_EXECUTE,
+}
+
+#[allow(non_camel_case_types, dead_code)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[repr(C)]
+pub enum LLVMResult {
+    OK,
+    ALLOCATE_FAILURE,
+    PROTECT_FAILURE,
+    DEALLOC_FAILURE,
+    OBJECT_LOAD_FAILURE,
+}
+
+#[repr(C)]
+pub struct Callbacks {
+    pub alloc_memory: extern "C" fn(usize, MemProtect, &mut *mut u8, &mut usize) -> LLVMResult,
+    pub protect_memory: extern "C" fn(*mut u8, usize, MemProtect) -> LLVMResult,
+    pub dealloc_memory: extern "C" fn(*mut u8, usize) -> LLVMResult,
+
+    pub lookup_vm_symbol: extern "C" fn(*const c_char, usize) -> *const vm::Func,
+    pub visit_fde: extern "C" fn(*mut u8, usize, extern "C" fn(*mut u8)),
+}