mirror of
https://github.com/mii443/wasmer.git
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75 lines
2.3 KiB
Rust
75 lines
2.3 KiB
Rust
//! Create, set, get and destroy global variables of an instance.
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use crate::error::update_last_error;
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use crate::value::{wasmer_value_t, wasmer_value_tag};
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use std::ptr::NonNull;
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use wasmer::Global;
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#[repr(C)]
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#[derive(Clone)]
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pub struct wasmer_global_descriptor_t {
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mutable: bool,
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kind: wasmer_value_tag,
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}
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#[repr(C)]
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#[derive(Clone)]
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pub struct wasmer_global_t;
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/// Creates a new Global and returns a pointer to it.
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/// The caller owns the object and should call `wasmer_global_destroy` to free it.
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#[no_mangle]
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pub extern "C" fn wasmer_global_new(value: wasmer_value_t, mutable: bool) -> *mut wasmer_global_t {
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let store = crate::get_global_store();
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let global = if mutable {
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Global::new_mut(store, value.into())
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} else {
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Global::new(store, value.into())
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};
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Box::into_raw(Box::new(global)) as *mut wasmer_global_t
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}
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/// Gets the value stored by the given Global
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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_global_get(global: *mut wasmer_global_t) -> wasmer_value_t {
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let global = &*(global as *mut Global);
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let value: wasmer_value_t = global.get().into();
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value
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}
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/// Sets the value stored by the given Global
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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_global_set(global: *mut wasmer_global_t, value: wasmer_value_t) {
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let global = &*(global as *mut Global);
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if let Err(err) = global.set(value.into()) {
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update_last_error(err);
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// can't return an error without breaking the API, probaly a safe change
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// return wasmer_result_t::WASMER_ERROR;
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}
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}
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/// Returns a descriptor (type, mutability) of the given Global
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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_global_get_descriptor(
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global: *mut wasmer_global_t,
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) -> wasmer_global_descriptor_t {
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let global = &*(global as *mut Global);
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let descriptor = global.ty();
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wasmer_global_descriptor_t {
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mutable: descriptor.mutability.into(),
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kind: descriptor.ty.into(),
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}
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}
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/// Frees memory for the given Global
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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_global_destroy(global: Option<NonNull<wasmer_global_t>>) {
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if let Some(global_inner) = global {
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Box::from_raw(global_inner.cast::<Global>().as_ptr());
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}
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}
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