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feat(runtime-c-api) Implement the wasmer_export_to_memory function.

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This new function returns a `wasmer_memory_t` from a
`wasmer_export_t`.
This commit is contained in:
Ivan Enderlin
2019-03-27 10:44:47 +01:00
parent 5661540097
commit 6fca475564
1 changed files with 31 additions and 4 deletions
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35
lib/runtime-c-api/src/lib.rs
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@ -2,7 +2,7 @@ extern crate wasmer_runtime;
extern crate wasmer_runtime_core;
use libc::{c_char, c_int, int32_t, int64_t, uint32_t, uint8_t};
use std::cell::RefCell;
use std::cell::{Cell, RefCell};
use std::collections::HashMap;
use std::error::Error;
use std::ffi::CStr;
@ -1409,6 +1409,34 @@ pub unsafe extern "C" fn wasmer_export_to_func(
export as *const wasmer_export_func_t
}
/// Gets a memory pointer from an export 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.
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
pub unsafe extern "C" fn wasmer_export_to_memory(
export: *const wasmer_export_t,
memory: *mut *mut wasmer_memory_t,
) -> wasmer_result_t {
let named_export = &*(export as *const NamedExport);
let export = &named_export.export;
if let Export::Memory(exported_memory) = export {
*memory = exported_memory as *const Memory as *mut wasmer_memory_t;
wasmer_result_t::WASMER_OK
} else {
update_last_error(CApiError {
msg: "cannot cast the `wasmer_export_t` pointer to a `wasmer_memory_t` \
pointer because it does not represent a memory export."
.to_string(),
});
wasmer_result_t::WASMER_ERROR
}
}
/// Gets name from wasmer_export
#[no_mangle]
#[allow(clippy::cast_ptr_alignment)]
@ -1517,9 +1545,8 @@ pub extern "C" fn wasmer_instance_context_data_get(
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]
pub extern "C" fn wasmer_memory_data(mem: *const wasmer_memory_t) -> *mut uint8_t {
let memory = mem as *const Memory;
use std::cell::Cell;
unsafe { ((*memory).view::<u8>()[..]).as_ptr() as *mut Cell<u8> as *mut u8 }
let memory = unsafe { &*(mem as *const Memory) };
memory.view::<u8>()[..].as_ptr() as *mut Cell<u8> as *mut u8
}
/// Gets the size in bytes of a Memory