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

603 lines
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Rust
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extern crate wasmer_runtime;
extern crate wasmer_runtime_core;
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use libc::{c_char, c_int, int32_t, int64_t, uint32_t, uint8_t};
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use std::cell::RefCell;
use std::error::Error;
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use std::ffi::CStr;
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use std::slice;
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use std::str;
use std::sync::Arc;
use std::{ffi::c_void, mem, ptr};
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use wasmer_runtime::{Ctx, Global, ImportObject, Instance, Memory, Table, Value};
use wasmer_runtime_core::export::{Context, Export, FuncPointer};
use wasmer_runtime_core::import::{LikeNamespace, Namespace};
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use wasmer_runtime_core::types::{
ElementType, FuncSig, GlobalDescriptor, MemoryDescriptor, TableDescriptor, Type,
};
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use wasmer_runtime_core::units::{Bytes, Pages};
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#[allow(non_camel_case_types)]
pub struct wasmer_import_object_t();
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#[allow(non_camel_case_types)]
pub struct wasmer_instance_t();
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#[allow(non_camel_case_types)]
pub struct wasmer_instance_context_t();
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#[allow(non_camel_case_types)]
#[no_mangle]
#[repr(C)]
pub enum wasmer_compile_result_t {
WASMER_COMPILE_OK = 1,
WASMER_COMPILE_ERROR = 2,
}
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#[allow(non_camel_case_types)]
#[no_mangle]
#[repr(C)]
pub enum wasmer_call_result_t {
WASMER_CALL_OK = 1,
WASMER_CALL_ERROR = 2,
}
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#[allow(non_camel_case_types)]
#[no_mangle]
#[repr(C)]
pub enum wasmer_memory_result_t {
WASMER_MEMORY_OK = 1,
WASMER_MEMORY_ERROR = 2,
}
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#[allow(non_camel_case_types)]
#[no_mangle]
#[repr(C)]
pub enum wasmer_table_result_t {
WASMER_TABLE_OK = 1,
WASMER_TABLE_ERROR = 2,
}
#[repr(u32)]
#[derive(Clone)]
pub enum wasmer_value_tag {
WASM_I32,
WASM_I64,
WASM_F32,
WASM_F64,
}
#[repr(C)]
#[derive(Clone, Copy)]
pub union wasmer_value {
I32: int32_t,
I64: int64_t,
F32: f32,
F64: f64,
}
#[repr(C)]
#[derive(Clone)]
pub struct wasmer_value_t {
tag: wasmer_value_tag,
value: wasmer_value,
}
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#[repr(C)]
#[derive(Clone)]
pub struct wasmer_global_descriptor_t {
mutable: bool,
kind: wasmer_value_tag,
}
#[repr(C)]
#[derive(Clone)]
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pub struct wasmer_memory_t();
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#[repr(C)]
#[derive(Clone)]
pub struct wasmer_table_t();
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#[repr(C)]
#[derive(Clone)]
pub struct wasmer_global_t();
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#[repr(C)]
pub struct wasmer_limits_t {
pub min: uint32_t,
pub max: uint32_t,
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
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pub unsafe extern "C" fn wasmer_validate(
wasm_bytes: *mut uint8_t,
wasm_bytes_len: uint32_t,
) -> bool {
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if wasm_bytes.is_null() {
return false;
}
let bytes: &[u8] =
unsafe { ::std::slice::from_raw_parts_mut(wasm_bytes, wasm_bytes_len as usize) };
wasmer_runtime_core::validate(bytes)
}
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#[no_mangle]
pub extern "C" fn wasmer_import_object_new() -> *mut wasmer_import_object_t {
Box::into_raw(Box::new(ImportObject::new())) as *mut wasmer_import_object_t
}
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#[no_mangle]
pub unsafe extern "C" fn wasmer_memory_new(
mut memory: *mut *mut wasmer_memory_t,
limits: wasmer_limits_t,
) -> wasmer_memory_result_t {
let desc = MemoryDescriptor {
minimum: Pages(limits.min),
maximum: Some(Pages(limits.max)),
shared: false,
};
let result = Memory::new(desc);
let new_memory = match result {
Ok(memory) => memory,
Err(error) => {
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update_last_error(error);
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return wasmer_memory_result_t::WASMER_MEMORY_ERROR;
}
};
unsafe { *memory = Box::into_raw(Box::new(new_memory)) as *mut wasmer_memory_t };
wasmer_memory_result_t::WASMER_MEMORY_OK
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_memory_grow(
memory: *mut wasmer_memory_t,
delta: uint32_t,
) -> wasmer_memory_result_t {
let memory = unsafe { Box::from_raw(memory as *mut Memory) };
let maybe_delta = memory.grow(Pages(delta));
Box::into_raw(memory);
if let Some(_delta) = maybe_delta {
wasmer_memory_result_t::WASMER_MEMORY_OK
} else {
wasmer_memory_result_t::WASMER_MEMORY_ERROR
}
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_memory_length(memory: *mut wasmer_memory_t) -> uint32_t {
let memory = unsafe { Box::from_raw(memory as *mut Memory) };
let Pages(len) = memory.size();
Box::into_raw(memory);
len
}
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#[no_mangle]
pub unsafe extern "C" fn wasmer_table_new(
mut table: *mut *mut wasmer_table_t,
limits: wasmer_limits_t,
) -> wasmer_table_result_t {
let desc = TableDescriptor {
element: ElementType::Anyfunc,
minimum: limits.min,
maximum: Some(limits.max),
};
let result = Table::new(desc);
let new_table = match result {
Ok(table) => table,
Err(error) => {
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update_last_error(error);
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return wasmer_table_result_t::WASMER_TABLE_ERROR;
}
};
unsafe { *table = Box::into_raw(Box::new(new_table)) as *mut wasmer_table_t };
wasmer_table_result_t::WASMER_TABLE_OK
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_table_grow(
table: *mut wasmer_table_t,
delta: uint32_t,
) -> wasmer_table_result_t {
let table = unsafe { Box::from_raw(table as *mut Table) };
let maybe_delta = table.grow(delta);
Box::into_raw(table);
if let Some(_delta) = maybe_delta {
wasmer_table_result_t::WASMER_TABLE_OK
} else {
wasmer_table_result_t::WASMER_TABLE_ERROR
}
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_table_length(table: *mut wasmer_table_t) -> uint32_t {
let table = unsafe { Box::from_raw(table as *mut Table) };
let len = table.size();
Box::into_raw(table);
len
}
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_table_destroy(table: *mut wasmer_table_t) {
if !table.is_null() {
drop(unsafe { Box::from_raw(table as *mut Table) });
}
}
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#[no_mangle]
pub unsafe extern "C" fn wasmer_global_new(
value: wasmer_value_t,
mutable: bool,
) -> *mut wasmer_global_t {
let global = if mutable {
Global::new_mutable(value.into())
} else {
Global::new(value.into())
};
unsafe { Box::into_raw(Box::new(global)) as *mut wasmer_global_t }
}
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_global_get(global: *mut wasmer_global_t) -> wasmer_value_t {
let global = unsafe { Box::from_raw(global as *mut Global) };
let value: wasmer_value_t = global.get().into();
Box::into_raw(global);
value
}
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_global_set(global: *mut wasmer_global_t, value: wasmer_value_t) {
let global = unsafe { Box::from_raw(global as *mut Global) };
global.set(value.into());
Box::into_raw(global);
}
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_global_get_descriptor(
global: *mut wasmer_global_t,
) -> wasmer_global_descriptor_t {
let global = unsafe { Box::from_raw(global as *mut Global) };
let descriptor = global.descriptor();
let desc = wasmer_global_descriptor_t {
mutable: descriptor.mutable,
kind: descriptor.ty.into(),
};
Box::into_raw(global);
desc
}
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_global_destroy(global: *mut wasmer_global_t) {
if !global.is_null() {
drop(unsafe { Box::from_raw(global as *mut Global) });
}
}
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#[allow(clippy::cast_ptr_alignment)]
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#[no_mangle]
pub extern "C" fn wasmer_import_object_destroy(import_object: *mut wasmer_import_object_t) {
if !import_object.is_null() {
drop(unsafe { Box::from_raw(import_object as *mut ImportObject) });
}
}
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#[allow(clippy::cast_ptr_alignment)]
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#[no_mangle]
pub extern "C" fn wasmer_memory_destroy(memory: *mut wasmer_memory_t) {
if !memory.is_null() {
drop(unsafe { Box::from_raw(memory as *mut Memory) });
}
}
#[allow(clippy::cast_ptr_alignment)]
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#[no_mangle]
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pub unsafe extern "C" fn wasmer_instantiate(
mut instance: *mut *mut wasmer_instance_t,
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wasm_bytes: *mut uint8_t,
wasm_bytes_len: uint32_t,
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import_object: *mut wasmer_import_object_t,
) -> wasmer_compile_result_t {
let import_object = unsafe { Box::from_raw(import_object as *mut ImportObject) };
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if wasm_bytes.is_null() {
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return wasmer_compile_result_t::WASMER_COMPILE_ERROR;
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}
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let bytes: &[u8] =
unsafe { ::std::slice::from_raw_parts_mut(wasm_bytes, wasm_bytes_len as usize) };
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let result = wasmer_runtime::instantiate(bytes, &*import_object);
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let new_instance = match result {
Ok(instance) => instance,
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Err(error) => {
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return wasmer_compile_result_t::WASMER_COMPILE_ERROR;
}
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};
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unsafe { *instance = Box::into_raw(Box::new(new_instance)) as *mut wasmer_instance_t };
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Box::into_raw(import_object);
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wasmer_compile_result_t::WASMER_COMPILE_OK
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
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pub unsafe extern "C" fn wasmer_instance_call(
instance: *mut wasmer_instance_t,
name: *const c_char,
params: *const wasmer_value_t,
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params_len: c_int,
results: *mut wasmer_value_t,
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results_len: c_int,
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) -> wasmer_call_result_t {
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// TODO handle params and results
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if instance.is_null() {
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return wasmer_call_result_t::WASMER_CALL_ERROR;
}
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if name.is_null() {
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return wasmer_call_result_t::WASMER_CALL_ERROR;
}
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if params.is_null() {
return wasmer_call_result_t::WASMER_CALL_ERROR;
}
let params: &[wasmer_value_t] = slice::from_raw_parts(params, params_len as usize);
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// TODO Fix this conversion and params
let params: Vec<Value> = params.iter().cloned().map(|x| x.into()).collect();
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// let params= &[Value::I32(3), Value::I32(4)];
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let func_name_c = unsafe { CStr::from_ptr(name) };
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let func_name_r = func_name_c.to_str().unwrap();
let instance = unsafe { Box::from_raw(instance as *mut Instance) };
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let results: &mut [wasmer_value_t] = slice::from_raw_parts_mut(results, results_len as usize);
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let result = instance.call(func_name_r, &params[..]);
Box::into_raw(instance);
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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 {
tag: wasmer_value_tag::WASM_I32,
value: wasmer_value { I32: x },
},
Value::I64(x) => wasmer_value_t {
tag: wasmer_value_tag::WASM_I64,
value: wasmer_value { I64: x },
},
Value::F32(x) => wasmer_value_t {
tag: wasmer_value_tag::WASM_F32,
value: wasmer_value { F32: x },
},
Value::F64(x) => wasmer_value_t {
tag: wasmer_value_tag::WASM_F64,
value: wasmer_value { F64: x },
},
};
results[0] = ret;
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}
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wasmer_call_result_t::WASMER_CALL_OK
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}
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Err(err) => {
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update_last_error(err);
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wasmer_call_result_t::WASMER_CALL_ERROR
}
}
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
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pub unsafe extern "C" fn wasmer_imports_set_import_func(
import_object: *mut wasmer_import_object_t,
namespace: *const c_char,
name: *const c_char,
func: extern "C" fn(data: *mut c_void),
params: *const wasmer_value_tag,
params_len: c_int,
returns: *const wasmer_value_tag,
returns_len: c_int,
) {
let mut import_object = unsafe { Box::from_raw(import_object as *mut ImportObject) };
let namespace_c = unsafe { CStr::from_ptr(namespace) };
let namespace_r = namespace_c.to_str().unwrap();
let name_c = unsafe { CStr::from_ptr(name) };
let name_r = name_c.to_str().unwrap();
let params: &[wasmer_value_tag] = slice::from_raw_parts(params, params_len as usize);
let params: Vec<Type> = params.iter().cloned().map(|x| x.into()).collect();
let returns: &[wasmer_value_tag] = slice::from_raw_parts(returns, returns_len as usize);
let returns: Vec<Type> = returns.iter().cloned().map(|x| x.into()).collect();
let export = Export::Function {
func: unsafe { FuncPointer::new(func as _) },
ctx: Context::Internal,
signature: Arc::new(FuncSig::new(params, returns)),
};
// TODO handle existing namespace
// let maybe_namespace = import_object.get_namespace(namespace_r);
// if let Some(n) = maybe_namespace {
// n.insert(name_r, export);
// } else {
let mut namespace = Namespace::new();
namespace.insert(name_r, export);
import_object.register(namespace_r, namespace);
Box::into_raw(import_object);
// };
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
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pub extern "C" fn wasmer_instance_context_memory(
ctx: *mut wasmer_instance_context_t,
memory_idx: uint32_t,
) -> *const wasmer_memory_t {
let mut ctx = unsafe { Box::from_raw(ctx as *mut Ctx) };
let memory = ctx.memory(0);
memory as *const Memory as *const wasmer_memory_t
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_memory_data(mem: *mut wasmer_memory_t) -> *mut uint8_t {
let memory = mem as *mut Memory;
use std::cell::Cell;
unsafe { ((*memory).view::<u8>()[..]).as_ptr() as *mut Cell<u8> as *mut u8 }
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_memory_data_length(mem: *mut wasmer_memory_t) -> uint32_t {
let memory = mem as *mut Memory;
let Bytes(len) = unsafe { (*memory).size().bytes() };
len as uint32_t
}
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#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_instance_destroy(instance: *mut wasmer_instance_t) {
if !instance.is_null() {
drop(unsafe { Box::from_raw(instance as *mut Instance) });
}
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}
impl From<wasmer_value_t> for Value {
fn from(v: wasmer_value_t) -> Self {
unsafe {
match v {
wasmer_value_t {
tag: WASM_I32,
value: wasmer_value { I32 },
} => Value::I32(I32),
wasmer_value_t {
tag: WASM_I64,
value: wasmer_value { I64 },
} => Value::I64(I64),
wasmer_value_t {
tag: WASM_F32,
value: wasmer_value { F32 },
} => Value::F32(F32),
wasmer_value_t {
tag: WASM_F64,
value: wasmer_value { F64 },
} => Value::F64(F64),
_ => panic!("not implemented"),
}
}
}
}
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impl From<Value> for wasmer_value_t {
fn from(val: Value) -> Self {
match val {
Value::I32(x) => wasmer_value_t {
tag: wasmer_value_tag::WASM_I32,
value: wasmer_value { I32: x },
},
Value::I64(x) => wasmer_value_t {
tag: wasmer_value_tag::WASM_I64,
value: wasmer_value { I64: x },
},
Value::F32(x) => wasmer_value_t {
tag: wasmer_value_tag::WASM_F32,
value: wasmer_value { F32: x },
},
Value::F64(x) => wasmer_value_t {
tag: wasmer_value_tag::WASM_F64,
value: wasmer_value { F64: x },
},
}
}
}
impl From<Type> for wasmer_value_tag {
fn from(ty: Type) -> Self {
match ty {
Type::I32 => wasmer_value_tag::WASM_I32,
Type::I64 => wasmer_value_tag::WASM_I64,
Type::F32 => wasmer_value_tag::WASM_F32,
Type::F64 => wasmer_value_tag::WASM_F64,
_ => panic!("not implemented"),
}
}
}
impl From<wasmer_value_tag> for Type {
fn from(v: wasmer_value_tag) -> Self {
unsafe {
match v {
wasmer_value_tag::WASM_I32 => Type::I32,
wasmer_value_tag::WASM_I64 => Type::I64,
wasmer_value_tag::WASM_F32 => Type::F32,
wasmer_value_tag::WASM_F64 => Type::F64,
_ => panic!("not implemented"),
}
}
}
}
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// Error reporting
thread_local! {
static LAST_ERROR: RefCell<Option<Box<Error>>> = RefCell::new(None);
}
fn update_last_error<E: Error + 'static>(err: E) {
LAST_ERROR.with(|prev| {
*prev.borrow_mut() = Some(Box::new(err));
});
}
/// Retrieve the most recent error, clearing it in the process.
fn take_last_error() -> Option<Box<Error>> {
LAST_ERROR.with(|prev| prev.borrow_mut().take())
}
#[no_mangle]
pub extern "C" fn wasmer_last_error_length() -> c_int {
LAST_ERROR.with(|prev| match *prev.borrow() {
Some(ref err) => err.to_string().len() as c_int + 1,
None => 0,
})
}
#[no_mangle]
pub unsafe extern "C" fn wasmer_last_error_message(buffer: *mut c_char, length: c_int) -> c_int {
if buffer.is_null() {
// buffer pointer is null
return -1;
}
let last_error = match take_last_error() {
Some(err) => err,
None => return 0,
};
let error_message = last_error.to_string();
let buffer = slice::from_raw_parts_mut(buffer as *mut u8, length as usize);
if error_message.len() >= buffer.len() {
// buffer to small for err message
return -1;
}
ptr::copy_nonoverlapping(
error_message.as_ptr(),
buffer.as_mut_ptr(),
error_message.len(),
);
// Add a trailing null so people using the string as a `char *` don't
// accidentally read into garbage.
buffer[error_message.len()] = 0;
error_message.len() as c_int
}