Remove unused code, cleanup

lib/emscripten/src/lib.rs

@@ -1,13 +1,11 @@
-#[macro_use]
 extern crate wasmer_runtime_core;
 
 use byteorder::{ByteOrder, LittleEndian};
 use libc::c_int;
 use std::cell::UnsafeCell;
-use std::{ffi::c_void, mem, ptr};
-use std::{fmt, mem::size_of, slice};
+use std::{ffi::c_void, fmt, mem, ptr};
 use wasmer_runtime_core::{
-    error::{CallResult, ResolveError},
+    error::CallResult,
     export::{Context, Export, FuncPointer, GlobalPointer, MemoryPointer, TablePointer},
     import::{ImportObject, Namespace},
     instance::Instance,
@@ -15,11 +13,7 @@ use wasmer_runtime_core::{
     module::Module,
     structures::TypedIndex,
     table::TableBacking,
-    types::{
-        ElementType, FuncSig, GlobalDesc, LocalMemoryIndex, Memory, Table,
-        Type::{self, *},
-        Value,
-    },
+    types::{ElementType, FuncSig, GlobalDesc, LocalMemoryIndex, Memory, Table, Type::*, Value},
     vm::Ctx,
     vm::LocalGlobal,
     vm::LocalMemory,
@@ -163,7 +157,7 @@ pub fn run_emscripten_instance(
 
     let main_func = instance.func("_main")?;
     let num_params = main_func.signature().params.len();
-    let result = match num_params {
+    let _result = match num_params {
         2 => {
             let (argc, argv) = store_module_arguments(path, args, instance.ctx());
             instance.call("_main", &[Value::I32(argc as i32), Value::I32(argv as i32)])?;
@@ -202,118 +196,6 @@ fn store_module_arguments(path: &str, args: Vec<&str>, ctx: &mut Ctx) -> (u32, u
     (argc as u32, argv_offset)
 }
 
-/// Passes arguments from the host to the WebAssembly instance.
-fn get_main_args(
-    main_name: &str,
-    args: Vec<&str>,
-    instance: &mut Instance,
-) -> CallResult<Vec<Value>> {
-    // Getting main function signature.
-
-    let func = instance.func(main_name)?;
-    let func_sig = func.signature();
-    let params = &func_sig.params;
-
-    // Check for a () or (i32, i32) sig.
-    match params.as_slice() {
-        &[Type::I32, Type::I32] => {
-            // Copy strings into wasm memory and get addresses to them.
-            let string_addresses = args
-                .iter()
-                .map(|string| copy_string_into_wasm(instance, (*string).to_string()).unwrap())
-                .collect();
-
-            // Create a wasm array to the strings.
-            let array = create_wasm_array(instance, string_addresses).unwrap();
-
-            Ok(vec![
-                Value::I32(array as i32),
-                Value::I32(args.len() as i32),
-            ])
-        }
-        &[] => Ok(vec![]),
-        _ => Err(ResolveError::Signature {
-            expected: FuncSig {
-                params: vec![Type::I32, Type::I32],
-                returns: vec![],
-            },
-            found: params.to_vec(),
-        }
-        .into()),
-    }
-}
-
-/// Copy rust string to wasm instance.
-fn copy_string_into_wasm(instance: &mut Instance, string: String) -> CallResult<u32> {
-    let string_len = string.len();
-
-    let space_offset = instance
-        .call("_malloc", &[Value::I32((string_len as i32) + 1)])
-        .unwrap();
-
-    let space_offset = match space_offset.as_slice() {
-        &[Value::I32(res)] => Some(res as u32),
-        _ => None,
-    }
-    .unwrap();
-
-    let raw_memory = instance.ctx().memory(0)[space_offset as usize] as *mut u8;
-
-    let slice = unsafe { slice::from_raw_parts_mut(raw_memory, string_len) };
-
-    for (byte, loc) in string.bytes().zip(slice.iter_mut()) {
-        *loc = byte;
-    }
-
-    unsafe { *raw_memory.add(string_len) = 0 };
-
-    Ok(space_offset)
-}
-
-/// Create a pointer to an array of items in a wasm memory
-fn create_wasm_array(instance: &mut Instance, values: Vec<u32>) -> CallResult<u32> {
-    let values_len = values.len();
-
-    // Space to store pointers to values
-    let values_offset = instance
-        .call(
-            "_malloc",
-            &[Value::I32((size_of::<u32>() * values.len()) as i32)],
-        )
-        .unwrap();
-
-    let values_offset = match values_offset.as_slice() {
-        &[Value::I32(res)] => Some(res as u32),
-        _ => None,
-    }
-    .unwrap();
-
-    let raw_memory = instance.ctx().memory(0)[values_offset as usize] as *mut u32;
-
-    let slice = unsafe { slice::from_raw_parts_mut(raw_memory, values_len) };
-
-    for (value, loc) in values.iter().zip(slice.iter_mut()) {
-        *loc = value.clone();
-    }
-
-    // Space to store pointer to array
-    let array_offset = instance
-        .call("_malloc", &[Value::I32(size_of::<u32>() as i32)])
-        .unwrap();
-
-    let array_offset = match array_offset.as_slice() {
-        &[Value::I32(res)] => Some(res as u32),
-        _ => None,
-    }
-    .unwrap();
-
-    let raw_memory = instance.ctx().memory(0)[values_offset as usize] as *mut u32;
-
-    unsafe { *raw_memory = values_offset };
-
-    Ok(array_offset)
-}
-
 pub fn emscripten_set_up_memory(memory: &mut LinearMemory) {
     let dynamictop_ptr = dynamictop_ptr(STATIC_BUMP) as usize;
     let dynamictop_ptr_offset = dynamictop_ptr + mem::size_of::<u32>();