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

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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;
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use std::collections::HashMap;
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use std::error::Error;
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use std::ffi::CStr;
use std::fmt;
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use std::slice;
use std::sync::Arc;
use std::{ffi::c_void, ptr};
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use wasmer_runtime::{Ctx, Global, ImportObject, Instance, Memory, Module, Table, Value};
use wasmer_runtime_core::export::{Context, Export, FuncPointer};
use wasmer_runtime_core::import::Namespace;
use wasmer_runtime_core::types::{ElementType, FuncSig, 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_module_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)]
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pub enum wasmer_result_t {
WASMER_OK = 1,
WASMER_ERROR = 2,
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}
#[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_func_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: wasmer_limit_option_t,
}
#[repr(C)]
pub struct wasmer_limit_option_t {
pub has_some: bool,
pub some: uint32_t,
}
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#[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)]
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pub struct wasmer_import_t {
module_name: wasmer_byte_array,
import_name: wasmer_byte_array,
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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,
}
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#[repr(C)]
pub struct wasmer_byte_array {
bytes: *const uint8_t,
bytes_len: uint32_t,
}
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/// Returns true for valid wasm bytes and false for invalid bytes
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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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/// Creates a new Memory for the given descriptor and initializes the given
/// pointer to pointer to a pointer to the new memory.
///
/// The caller owns the object and should call `wasmer_memory_destroy` to free it.
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
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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,
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) -> wasmer_result_t {
let max = if limits.max.has_some {
Some(Pages(limits.max.some))
} else {
None
};
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let desc = MemoryDescriptor {
minimum: Pages(limits.min),
maximum: max,
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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_result_t::WASMER_ERROR;
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}
};
unsafe { *memory = Box::into_raw(Box::new(new_memory)) as *mut wasmer_memory_t };
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wasmer_result_t::WASMER_OK
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}
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/// Grows a Memory by the given number of pages.
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
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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,
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) -> wasmer_result_t {
let memory = unsafe { &*(memory as *mut Memory) };
let delta_result = memory.grow(Pages(delta));
match delta_result {
Ok(_) => wasmer_result_t::WASMER_OK,
Err(grow_error) => {
update_last_error(grow_error);
wasmer_result_t::WASMER_ERROR
}
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}
}
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/// Returns the current length in pages of the given memory
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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 { &*(memory as *mut Memory) };
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let Pages(len) = memory.size();
len
}
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/// Creates a new Table for the given descriptor and initializes the given
/// pointer to pointer to a pointer to the new Table.
///
/// The caller owns the object and should call `wasmer_table_destroy` to free it.
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
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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,
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) -> wasmer_result_t {
let max = if limits.max.has_some {
Some(limits.max.some)
} else {
None
};
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let desc = TableDescriptor {
element: ElementType::Anyfunc,
minimum: limits.min,
maximum: max,
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};
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_result_t::WASMER_ERROR;
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}
};
unsafe { *table = Box::into_raw(Box::new(new_table)) as *mut wasmer_table_t };
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wasmer_result_t::WASMER_OK
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}
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/// Grows a Table by the given number of elements.
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
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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,
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) -> wasmer_result_t {
let table = unsafe { &*(table as *mut Table) };
let delta_result = table.grow(delta);
match delta_result {
Ok(_) => wasmer_result_t::WASMER_OK,
Err(grow_error) => {
update_last_error(grow_error);
wasmer_result_t::WASMER_ERROR
}
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}
}
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/// Returns the current length of the given Table
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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 { &*(table as *mut Table) };
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let len = table.size();
len
}
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/// Frees memory for the given Table
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#[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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/// Creates a new Global and returns a pointer to it.
/// The caller owns the object and should call `wasmer_global_destroy` to free it.
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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 }
}
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/// Gets the value stored by the given Global
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#[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 { &*(global as *mut Global) };
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let value: wasmer_value_t = global.get().into();
value
}
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/// Sets the value stored by the given Global
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#[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 { &*(global as *mut Global) };
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global.set(value.into());
}
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/// Returns a descriptor (type, mutability) of the given Global
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#[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 { &*(global as *mut Global) };
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let descriptor = global.descriptor();
let desc = wasmer_global_descriptor_t {
mutable: descriptor.mutable,
kind: descriptor.ty.into(),
};
desc
}
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/// Frees memory for the given Global
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#[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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/// Frees memory for the given Memory
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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) });
}
}
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/// Creates a new Module from the given wasm bytes.
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub unsafe extern "C" fn wasmer_compile(
mut module: *mut *mut wasmer_module_t,
wasm_bytes: *mut uint8_t,
wasm_bytes_len: uint32_t,
) -> wasmer_result_t {
let bytes: &[u8] =
unsafe { ::std::slice::from_raw_parts_mut(wasm_bytes, wasm_bytes_len as usize) };
let result = wasmer_runtime::compile(bytes);
let new_module = match result {
Ok(instance) => instance,
Err(error) => {
update_last_error(error);
return wasmer_result_t::WASMER_ERROR;
}
};
unsafe { *module = Box::into_raw(Box::new(new_module)) as *mut wasmer_module_t };
wasmer_result_t::WASMER_OK
}
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/// Creates a new Instance from the given module and imports.
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub unsafe extern "C" fn wasmer_module_instantiate(
module: *mut wasmer_module_t,
mut instance: *mut *mut wasmer_instance_t,
imports: *mut wasmer_import_t,
imports_len: c_int,
) -> wasmer_result_t {
let imports: &[wasmer_import_t] = slice::from_raw_parts(imports, imports_len as usize);
let mut import_object = ImportObject::new();
let mut namespaces = HashMap::new();
for import in imports {
let module_name = slice::from_raw_parts(
import.module_name.bytes,
import.module_name.bytes_len as usize,
);
let module_name = if let Ok(s) = std::str::from_utf8(module_name) {
s
} else {
update_last_error(CApiError {
msg: "error converting module name to string".to_string(),
});
return wasmer_result_t::WASMER_ERROR;
};
let import_name = slice::from_raw_parts(
import.import_name.bytes,
import.import_name.bytes_len as usize,
);
let import_name = if let Ok(s) = std::str::from_utf8(import_name) {
s
} else {
update_last_error(CApiError {
msg: "error converting import_name to string".to_string(),
});
return wasmer_result_t::WASMER_ERROR;
};
let namespace = namespaces
.entry(module_name)
.or_insert_with(|| Namespace::new());
let export = match import.tag {
wasmer_import_export_kind::WASM_MEMORY => import.value.memory as *mut Export,
wasmer_import_export_kind::WASM_FUNCTION => import.value.func as *mut Export,
wasmer_import_export_kind::WASM_GLOBAL => import.value.global as *mut Export,
wasmer_import_export_kind::WASM_TABLE => import.value.table as *mut Export,
};
namespace.insert(import_name, unsafe { (&*export).clone() });
}
for (module_name, namespace) in namespaces.into_iter() {
import_object.register(module_name, namespace);
}
let module = unsafe { &*(module as *mut Module) };
let new_instance = if let Ok(res) = module.instantiate(&import_object) {
res
} else {
update_last_error(CApiError {
msg: "error instantiating from module".to_string(),
});
return wasmer_result_t::WASMER_ERROR;
};
unsafe { *instance = Box::into_raw(Box::new(new_instance)) as *mut wasmer_instance_t };
wasmer_result_t::WASMER_OK
}
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/// Frees memory for the given Module
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_module_destroy(module: *mut wasmer_module_t) {
if !module.is_null() {
drop(unsafe { Box::from_raw(module as *mut Module) });
}
}
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/// 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`
/// and `wasmer_last_error_message` to get an error message.
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#[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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imports: *mut wasmer_import_t,
imports_len: c_int,
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) -> wasmer_result_t {
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if wasm_bytes.is_null() {
update_last_error(CApiError {
msg: "wasm bytes ptr is null".to_string(),
});
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return wasmer_result_t::WASMER_ERROR;
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}
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let imports: &[wasmer_import_t] = slice::from_raw_parts(imports, imports_len as usize);
let mut import_object = ImportObject::new();
let mut namespaces = HashMap::new();
for import in imports {
let module_name = slice::from_raw_parts(
import.module_name.bytes,
import.module_name.bytes_len as usize,
);
let module_name = if let Ok(s) = std::str::from_utf8(module_name) {
s
} else {
update_last_error(CApiError {
msg: "error converting module name to string".to_string(),
});
return wasmer_result_t::WASMER_ERROR;
};
let import_name = slice::from_raw_parts(
import.import_name.bytes,
import.import_name.bytes_len as usize,
);
let import_name = if let Ok(s) = std::str::from_utf8(import_name) {
s
} else {
update_last_error(CApiError {
msg: "error converting import_name to string".to_string(),
});
return wasmer_result_t::WASMER_ERROR;
};
let namespace = namespaces
.entry(module_name)
.or_insert_with(|| Namespace::new());
let export = match import.tag {
wasmer_import_export_kind::WASM_MEMORY => import.value.memory as *mut Export,
wasmer_import_export_kind::WASM_FUNCTION => import.value.func as *mut Export,
wasmer_import_export_kind::WASM_GLOBAL => import.value.global as *mut Export,
wasmer_import_export_kind::WASM_TABLE => import.value.table as *mut Export,
};
namespace.insert(import_name, unsafe { (&*export).clone() });
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}
for (module_name, namespace) in namespaces.into_iter() {
import_object.register(module_name, namespace);
}
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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) => {
// TODO the trait bound `wasmer_runtime::error::Error: std::error::Error` is not satisfied
//update_last_error(error);
update_last_error(CApiError {
msg: "error instantiating".to_string(),
});
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return wasmer_result_t::WASMER_ERROR;
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}
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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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wasmer_result_t::WASMER_OK
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}
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/// Calls an instances exported function by `name` with the provided parameters.
/// Results are set using the provided `results` pointer.
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
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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_result_t {
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if instance.is_null() {
update_last_error(CApiError {
msg: "instance ptr is null".to_string(),
});
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return wasmer_result_t::WASMER_ERROR;
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}
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if name.is_null() {
update_last_error(CApiError {
msg: "name ptr is null".to_string(),
});
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return wasmer_result_t::WASMER_ERROR;
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}
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if params.is_null() {
update_last_error(CApiError {
msg: "params ptr is null".to_string(),
});
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return wasmer_result_t::WASMER_ERROR;
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}
let params: &[wasmer_value_t] = slice::from_raw_parts(params, params_len as usize);
let params: Vec<Value> = params.iter().cloned().map(|x| x.into()).collect();
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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();
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let results: &mut [wasmer_value_t] = slice::from_raw_parts_mut(results, results_len as usize);
let result = (&*(instance as *mut Instance)).call(func_name_r, &params[..]);
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match result {
Ok(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_result_t::WASMER_OK
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}
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Err(err) => {
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update_last_error(err);
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wasmer_result_t::WASMER_ERROR
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}
}
}
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/// 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 { &mut *(instance as *mut Instance) };
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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 };
}
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 { &mut *(exports as *mut NamedExports) };
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let ptr = &mut (*named_exports).0[idx as usize] as *mut NamedExport as *mut wasmer_export_t;
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,
}
}
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/// Creates new func
///
/// The caller owns the object and should call `wasmer_func_destroy` to free it.
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
pub unsafe extern "C" fn wasmer_func_new(
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,
) -> *const wasmer_func_t {
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 = Box::new(Export::Function {
func: unsafe { FuncPointer::new(func as _) },
ctx: Context::Internal,
signature: Arc::new(FuncSig::new(params, returns)),
});
Box::into_raw(export) as *mut wasmer_func_t
}
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/// Sets the result parameter to the arity of the params of the wasmer_func_t
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
pub unsafe extern "C" fn wasmer_func_params_arity(
func: *mut wasmer_func_t,
result: *mut uint32_t,
) -> wasmer_result_t {
let mut export = unsafe { &mut *(func as *mut Export) };
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let result = if let Export::Function { ref signature, .. } = *export {
unsafe { *result = signature.params().len() as uint32_t };
wasmer_result_t::WASMER_OK
} else {
update_last_error(CApiError {
msg: "func ptr error in wasmer_func_params_arity".to_string(),
});
wasmer_result_t::WASMER_ERROR
};
result
}
/// Sets the params buffer to the parameter types of the given wasmer_func_t
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
pub unsafe extern "C" fn wasmer_func_params(
func: *mut wasmer_func_t,
params: *mut wasmer_value_tag,
params_len: c_int,
) -> wasmer_result_t {
let mut export = unsafe { &mut *(func as *mut Export) };
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let result = if let Export::Function { ref signature, .. } = *export {
let params: &mut [wasmer_value_tag] =
slice::from_raw_parts_mut(params, params_len as usize);
for (i, item) in signature.params().iter().enumerate() {
params[i] = item.into();
}
wasmer_result_t::WASMER_OK
} else {
update_last_error(CApiError {
msg: "func ptr error in wasmer_func_params".to_string(),
});
wasmer_result_t::WASMER_ERROR
};
result
}
/// Sets the returns buffer to the parameter types of the given wasmer_func_t
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
pub unsafe extern "C" fn wasmer_func_returns(
func: *mut wasmer_func_t,
returns: *mut wasmer_value_tag,
returns_len: c_int,
) -> wasmer_result_t {
let mut export = unsafe { &mut *(func as *mut Export) };
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let result = if let Export::Function { ref signature, .. } = *export {
let returns: &mut [wasmer_value_tag] =
slice::from_raw_parts_mut(returns, returns_len as usize);
for (i, item) in signature.returns().iter().enumerate() {
returns[i] = item.into();
}
wasmer_result_t::WASMER_OK
} else {
update_last_error(CApiError {
msg: "func ptr error in wasmer_func_returns".to_string(),
});
wasmer_result_t::WASMER_ERROR
};
result
}
/// Sets the result parameter to the arity of the returns of the wasmer_func_t
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
pub unsafe extern "C" fn wasmer_func_returns_arity(
func: *mut wasmer_func_t,
result: *mut uint32_t,
) -> wasmer_result_t {
let mut export = unsafe { &*(func as *mut Export) };
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let result = if let Export::Function { ref signature, .. } = *export {
unsafe { *result = signature.returns().len() as uint32_t };
wasmer_result_t::WASMER_OK
} else {
update_last_error(CApiError {
msg: "func ptr error in wasmer_func_results_arity".to_string(),
});
wasmer_result_t::WASMER_ERROR
};
result
}
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/// Frees memory for the given Func
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_func_destroy(func: *mut wasmer_func_t) {
if !func.is_null() {
drop(unsafe { Box::from_raw(func as *mut Export) });
}
}
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/// Gets func from wasm_export
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
pub unsafe extern "C" fn wasmer_export_to_func(
export: *mut wasmer_export_t,
) -> *const wasmer_func_t {
let named_export = &*(export as *mut NamedExport);
&named_export.export as *const Export as *const wasmer_func_t
}
/// Gets name from wasmer_export
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
pub unsafe extern "C" fn wasmer_export_name(export: *mut wasmer_export_t) -> wasmer_byte_array {
let named_export = &*(export as *mut NamedExport);
wasmer_byte_array {
bytes: named_export.name.as_ptr(),
bytes_len: named_export.name.len() as u32,
}
}
/// Calls a `func` with the provided parameters.
/// Results are set using the provided `results` pointer.
///
/// Returns `wasmer_result_t::WASMER_OK` upon success.
///
/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
/// and `wasmer_last_error_message` to get an error message.
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub unsafe extern "C" fn wasmer_func_call(
func: *mut wasmer_func_t,
params: *const wasmer_value_t,
params_len: c_int,
results: *mut wasmer_value_t,
results_len: c_int,
) -> wasmer_result_t {
if func.is_null() {
update_last_error(CApiError {
msg: "func ptr is null".to_string(),
});
return wasmer_result_t::WASMER_ERROR;
}
if params.is_null() {
update_last_error(CApiError {
msg: "params ptr is null".to_string(),
});
return wasmer_result_t::WASMER_ERROR;
}
let params: &[wasmer_value_t] = slice::from_raw_parts(params, params_len as usize);
let params: Vec<Value> = params.iter().cloned().map(|x| x.into()).collect();
let export_func = unsafe { &*(func as *mut Export) };
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let results: &mut [wasmer_value_t] = slice::from_raw_parts_mut(results, results_len as usize);
// TODO implement func.call
update_last_error(CApiError {
msg: "wasmer_func_call not yet implemented".to_string(),
});
wasmer_result_t::WASMER_ERROR
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// let result = instance.call(func_name_r, &params[..]);
// Box::into_raw(export_func);
// match result {
// Ok(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;
// }
// wasmer_result_t::WASMER_OK
// }
// Err(err) => {
// update_last_error(err);
// wasmer_result_t::WASMER_ERROR
// }
// }
}
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/// Gets the memory within the context at the index `memory_idx`.
/// The index is always 0 until multiple memories are supported.
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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 { &mut *(ctx as *mut Ctx) };
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let memory = ctx.memory(0);
memory as *const Memory as *const wasmer_memory_t
}
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/// Gets the start pointer to the bytes within a Memory
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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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/// Gets the size in bytes of a Memory
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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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/// Frees memory for the given Instance
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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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impl From<(std::string::String, wasmer_runtime_core::export::Export)> for NamedExport {
fn from((name, export): (String, Export)) -> Self {
NamedExport { name, export }
}
}
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impl From<&wasmer_runtime::wasm::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,
}
}
}
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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())
}
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/// Gets the length in bytes of the last error.
/// This can be used to dynamically allocate a buffer with the correct number of
/// bytes needed to store a message.
///
/// # Example
/// ```
/// int error_len = wasmer_last_error_length();
/// char *error_str = malloc(error_len);
/// ```
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#[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,
})
}
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/// Stores the last error message into the provided buffer up to the given `length`.
/// The `length` parameter must be large enough to store the last error message.
///
/// Returns the length of the string in bytes.
/// Returns `-1` if an error occurs.
///
/// # Example
/// ```
/// int error_len = wasmer_last_error_length();
/// char *error_str = malloc(error_len);
/// wasmer_last_error_message(error_str, error_len);
/// printf("Error str: `%s`\n", error_str);
/// ```
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#[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
}
#[derive(Debug)]
struct CApiError {
msg: String,
}
impl fmt::Display for CApiError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", &self.msg)
}
}
impl Error for CApiError {}
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struct NamedExport {
name: String,
export: Export,
}