2019-03-29 15:22:38 +00:00
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//! Create, read, destroy export definitions (function, global, memory
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//! and table) on an instance.
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2019-03-29 14:38:12 +00:00
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use crate::{
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error::{update_last_error, CApiError},
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global::wasmer_global_t,
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2019-03-29 14:50:16 +00:00
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import::wasmer_import_func_t,
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2019-03-29 14:38:12 +00:00
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memory::wasmer_memory_t,
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module::wasmer_module_t,
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table::wasmer_table_t,
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value::{wasmer_value, wasmer_value_t, wasmer_value_tag},
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2019-03-29 14:50:16 +00:00
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wasmer_byte_array, wasmer_result_t,
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2019-03-29 14:38:12 +00:00
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};
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use libc::{c_int, uint32_t};
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use std::{ptr, slice};
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use wasmer_runtime::{Instance, Memory, Module, Value};
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use wasmer_runtime_core::{export::Export, module::ExportIndex};
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#[repr(C)]
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#[derive(Clone)]
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pub struct wasmer_export_t;
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#[repr(C)]
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#[derive(Clone)]
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pub struct wasmer_exports_t;
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#[repr(C)]
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#[derive(Clone)]
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pub struct wasmer_export_func_t;
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#[repr(C)]
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#[derive(Clone)]
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pub struct wasmer_export_descriptor_t;
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#[repr(C)]
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#[derive(Clone)]
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pub struct wasmer_export_descriptors_t;
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#[repr(C)]
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#[derive(Clone, Copy)]
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pub union wasmer_import_export_value {
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pub func: *const wasmer_import_func_t,
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pub table: *const wasmer_table_t,
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pub memory: *const wasmer_memory_t,
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pub global: *const wasmer_global_t,
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}
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#[allow(non_camel_case_types)]
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#[repr(u32)]
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#[derive(Clone)]
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pub enum wasmer_import_export_kind {
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WASM_FUNCTION,
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WASM_GLOBAL,
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WASM_MEMORY,
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WASM_TABLE,
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}
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/// Gets export descriptors for the given module
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///
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/// The caller owns the object and should call `wasmer_export_descriptors_destroy` to free it.
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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_export_descriptors(
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module: *const wasmer_module_t,
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export_descriptors: *mut *mut wasmer_export_descriptors_t,
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) {
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let module = &*(module as *const Module);
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let named_export_descriptors: Box<NamedExportDescriptors> = Box::new(NamedExportDescriptors(
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module.info().exports.iter().map(|e| e.into()).collect(),
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));
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*export_descriptors =
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Box::into_raw(named_export_descriptors) as *mut wasmer_export_descriptors_t;
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}
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pub struct NamedExportDescriptors(Vec<NamedExportDescriptor>);
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/// Frees the memory for the given export descriptors
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#[allow(clippy::cast_ptr_alignment)]
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#[no_mangle]
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pub extern "C" fn wasmer_export_descriptors_destroy(
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export_descriptors: *mut wasmer_export_descriptors_t,
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) {
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if !export_descriptors.is_null() {
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unsafe { Box::from_raw(export_descriptors as *mut NamedExportDescriptors) };
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}
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}
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/// Gets the length of the export descriptors
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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_export_descriptors_len(
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exports: *mut wasmer_export_descriptors_t,
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) -> c_int {
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if exports.is_null() {
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return 0;
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}
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(*(exports as *mut NamedExportDescriptors)).0.len() as c_int
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}
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/// Gets export descriptor by index
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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_export_descriptors_get(
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export_descriptors: *mut wasmer_export_descriptors_t,
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idx: c_int,
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) -> *mut wasmer_export_descriptor_t {
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if export_descriptors.is_null() {
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return ptr::null_mut();
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}
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let named_export_descriptors = &mut *(export_descriptors as *mut NamedExportDescriptors);
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&mut (*named_export_descriptors).0[idx as usize] as *mut NamedExportDescriptor
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as *mut wasmer_export_descriptor_t
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}
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/// Gets name for the export descriptor
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_descriptor_name(
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export_descriptor: *mut wasmer_export_descriptor_t,
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) -> wasmer_byte_array {
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let named_export_descriptor = &*(export_descriptor as *mut NamedExportDescriptor);
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wasmer_byte_array {
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bytes: named_export_descriptor.name.as_ptr(),
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bytes_len: named_export_descriptor.name.len() as u32,
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}
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}
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/// Gets export descriptor kind
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_descriptor_kind(
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export: *mut wasmer_export_descriptor_t,
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) -> wasmer_import_export_kind {
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let named_export_descriptor = &*(export as *mut NamedExportDescriptor);
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named_export_descriptor.kind.clone()
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}
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pub(crate) struct NamedExports(pub Vec<NamedExport>);
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/// Frees the memory for the given exports
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#[allow(clippy::cast_ptr_alignment)]
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#[no_mangle]
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pub extern "C" fn wasmer_exports_destroy(exports: *mut wasmer_exports_t) {
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if !exports.is_null() {
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unsafe { Box::from_raw(exports as *mut NamedExports) };
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}
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}
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/// Gets the length of the exports
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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_exports_len(exports: *mut wasmer_exports_t) -> c_int {
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if exports.is_null() {
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return 0;
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}
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(*(exports as *mut NamedExports)).0.len() as c_int
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}
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/// Gets wasmer_export by index
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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_exports_get(
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exports: *mut wasmer_exports_t,
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idx: c_int,
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) -> *mut wasmer_export_t {
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if exports.is_null() {
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return ptr::null_mut();
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}
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let named_exports = &mut *(exports as *mut NamedExports);
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&mut (*named_exports).0[idx as usize] as *mut NamedExport as *mut wasmer_export_t
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}
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/// Gets wasmer_export kind
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_kind(
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export: *mut wasmer_export_t,
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) -> wasmer_import_export_kind {
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let named_export = &*(export as *mut NamedExport);
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match named_export.export {
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Export::Table(_) => wasmer_import_export_kind::WASM_TABLE,
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Export::Function { .. } => wasmer_import_export_kind::WASM_FUNCTION,
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Export::Global(_) => wasmer_import_export_kind::WASM_GLOBAL,
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Export::Memory(_) => wasmer_import_export_kind::WASM_MEMORY,
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}
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}
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/// Sets the result parameter to the arity of the params of the wasmer_export_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_func_params_arity(
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func: *const wasmer_export_func_t,
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result: *mut uint32_t,
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) -> wasmer_result_t {
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let named_export = &*(func as *const NamedExport);
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let export = &named_export.export;
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if let Export::Function { ref signature, .. } = *export {
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*result = signature.params().len() as uint32_t;
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wasmer_result_t::WASMER_OK
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} else {
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update_last_error(CApiError {
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msg: "func ptr error in wasmer_export_func_params_arity".to_string(),
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});
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wasmer_result_t::WASMER_ERROR
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}
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}
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/// Sets the params buffer to the parameter types of the given wasmer_export_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_func_params(
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func: *const wasmer_export_func_t,
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params: *mut wasmer_value_tag,
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2019-05-14 14:15:36 +00:00
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params_len: uint32_t,
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2019-03-29 14:38:12 +00:00
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) -> wasmer_result_t {
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let named_export = &*(func as *const NamedExport);
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let export = &named_export.export;
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if let Export::Function { ref signature, .. } = *export {
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let params: &mut [wasmer_value_tag] =
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slice::from_raw_parts_mut(params, params_len as usize);
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for (i, item) in signature.params().iter().enumerate() {
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params[i] = item.into();
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}
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wasmer_result_t::WASMER_OK
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} else {
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update_last_error(CApiError {
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msg: "func ptr error in wasmer_export_func_params".to_string(),
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});
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wasmer_result_t::WASMER_ERROR
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}
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}
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/// Sets the returns buffer to the parameter types of the given wasmer_export_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_func_returns(
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func: *const wasmer_export_func_t,
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returns: *mut wasmer_value_tag,
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2019-05-14 14:18:41 +00:00
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returns_len: uint32_t,
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2019-03-29 14:38:12 +00:00
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) -> wasmer_result_t {
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let named_export = &*(func as *const NamedExport);
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let export = &named_export.export;
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if let Export::Function { ref signature, .. } = *export {
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let returns: &mut [wasmer_value_tag] =
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slice::from_raw_parts_mut(returns, returns_len as usize);
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for (i, item) in signature.returns().iter().enumerate() {
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returns[i] = item.into();
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}
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wasmer_result_t::WASMER_OK
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} else {
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update_last_error(CApiError {
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msg: "func ptr error in wasmer_export_func_returns".to_string(),
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});
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wasmer_result_t::WASMER_ERROR
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}
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}
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/// Sets the result parameter to the arity of the returns of the wasmer_export_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_func_returns_arity(
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func: *const wasmer_export_func_t,
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result: *mut uint32_t,
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) -> wasmer_result_t {
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let named_export = &*(func as *const NamedExport);
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let export = &named_export.export;
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if let Export::Function { ref signature, .. } = *export {
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*result = signature.returns().len() as uint32_t;
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wasmer_result_t::WASMER_OK
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} else {
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update_last_error(CApiError {
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msg: "func ptr error in wasmer_export_func_results_arity".to_string(),
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});
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wasmer_result_t::WASMER_ERROR
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}
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}
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/// Gets export func from export
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_to_func(
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export: *const wasmer_export_t,
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) -> *const wasmer_export_func_t {
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export as *const wasmer_export_func_t
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}
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/// Gets a memory pointer from an export pointer.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_to_memory(
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export: *const wasmer_export_t,
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memory: *mut *mut wasmer_memory_t,
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) -> wasmer_result_t {
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let named_export = &*(export as *const NamedExport);
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let export = &named_export.export;
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if let Export::Memory(exported_memory) = export {
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*memory = exported_memory as *const Memory as *mut wasmer_memory_t;
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wasmer_result_t::WASMER_OK
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} else {
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update_last_error(CApiError {
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msg: "cannot cast the `wasmer_export_t` pointer to a `wasmer_memory_t` \
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pointer because it does not represent a memory export."
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.to_string(),
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});
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wasmer_result_t::WASMER_ERROR
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}
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}
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/// Gets name from wasmer_export
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#[no_mangle]
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#[allow(clippy::cast_ptr_alignment)]
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pub unsafe extern "C" fn wasmer_export_name(export: *mut wasmer_export_t) -> wasmer_byte_array {
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let named_export = &*(export as *mut NamedExport);
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wasmer_byte_array {
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bytes: named_export.name.as_ptr(),
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bytes_len: named_export.name.len() as u32,
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}
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}
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/// Calls a `func` with the provided parameters.
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/// Results are set using the provided `results` pointer.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// 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_export_func_call(
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func: *const wasmer_export_func_t,
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params: *const wasmer_value_t,
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params_len: c_int,
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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 func.is_null() {
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update_last_error(CApiError {
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msg: "func ptr is null".to_string(),
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});
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return wasmer_result_t::WASMER_ERROR;
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}
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if params.is_null() {
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update_last_error(CApiError {
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msg: "params ptr is null".to_string(),
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});
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return wasmer_result_t::WASMER_ERROR;
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}
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let params: &[wasmer_value_t] = slice::from_raw_parts(params, params_len as usize);
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let params: Vec<Value> = params.iter().cloned().map(|x| x.into()).collect();
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let named_export = &*(func as *mut NamedExport);
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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 instance = &*named_export.instance;
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let result = instance.call(&named_export.name, ¶ms[..]);
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match result {
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Ok(results_vec) => {
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if !results_vec.is_empty() {
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let ret = match results_vec[0] {
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Value::I32(x) => wasmer_value_t {
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tag: wasmer_value_tag::WASM_I32,
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value: wasmer_value { I32: x },
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},
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Value::I64(x) => wasmer_value_t {
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tag: wasmer_value_tag::WASM_I64,
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value: wasmer_value { I64: x },
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},
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Value::F32(x) => wasmer_value_t {
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tag: wasmer_value_tag::WASM_F32,
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value: wasmer_value { F32: x },
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},
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Value::F64(x) => wasmer_value_t {
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tag: wasmer_value_tag::WASM_F64,
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value: wasmer_value { F64: x },
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},
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};
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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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}
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}
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impl From<(&std::string::String, &ExportIndex)> for NamedExportDescriptor {
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fn from((name, export_index): (&String, &ExportIndex)) -> Self {
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let kind = match *export_index {
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ExportIndex::Memory(_) => wasmer_import_export_kind::WASM_MEMORY,
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ExportIndex::Global(_) => wasmer_import_export_kind::WASM_GLOBAL,
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ExportIndex::Table(_) => wasmer_import_export_kind::WASM_TABLE,
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ExportIndex::Func(_) => wasmer_import_export_kind::WASM_FUNCTION,
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};
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NamedExportDescriptor {
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name: name.clone(),
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kind,
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}
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}
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}
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pub(crate) struct NamedExport {
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pub(crate) name: String,
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pub(crate) export: Export,
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pub(crate) instance: *mut Instance,
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}
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pub(crate) struct NamedExportDescriptor {
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name: String,
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kind: wasmer_import_export_kind,
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}
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