2635ccb742
* Rename the `wasmtime_api` library to match the containing `wasmtime` crate
Commit d9ca508f80 renamed the
`wasmtime-api` crate to `wasmtime`, but left the name of the library it
contains as `wasmtime_api`.
It's fairly unusual for a crate to contain a library with a different
name, and it results in rather confusing error messages for a user; if
you list `wasmtime = "0.7"` in `Cargo.toml`, you can't `use
wasmtime::*`, you have to `use wasmtime_api::*;`.
Rename the `wasmtime_api` library to `wasmtime`.
* Stop renaming wasmtime to api on imports
Various users renamed the crate formerly known as wasmtime_api to api,
and then used api:: prefixes everywhere; change those all to wasmtime::
and drop the renaming.
83 lines
2.3 KiB
Rust
83 lines
2.3 KiB
Rust
//! WebAssembly Memory API object.
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use pyo3::class::PyBufferProtocol;
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use pyo3::exceptions::BufferError;
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use pyo3::ffi;
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use pyo3::prelude::*;
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use std::ffi::CStr;
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use std::os::raw::{c_int, c_void};
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use std::ptr;
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#[pyclass]
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pub struct Memory {
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pub memory: wasmtime::HostRef<wasmtime::Memory>,
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}
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#[pymethods]
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impl Memory {
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#[getter(current)]
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pub fn current(&self) -> u32 {
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self.memory.borrow().size()
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}
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pub fn grow(&self, _number: u32) -> u32 {
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(-1i32) as u32
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}
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}
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#[pyproto]
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impl PyBufferProtocol for Memory {
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fn bf_getbuffer(&self, view: *mut ffi::Py_buffer, flags: c_int) -> PyResult<()> {
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if view.is_null() {
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return Err(BufferError::py_err("View is null"));
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}
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unsafe {
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/*
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As a special case, for temporary buffers that are wrapped by
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PyMemoryView_FromBuffer() or PyBuffer_FillInfo() this field is NULL.
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In general, exporting objects MUST NOT use this scheme.
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*/
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(*view).obj = ptr::null_mut();
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}
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let readonly = if (flags & ffi::PyBUF_WRITABLE) == ffi::PyBUF_WRITABLE {
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0
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} else {
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1
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};
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unsafe {
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let base = self.memory.borrow().data_ptr();
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let current_length = self.memory.borrow().data_size();
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(*view).buf = base as *mut c_void;
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(*view).len = current_length as isize;
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(*view).readonly = readonly;
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(*view).itemsize = 1;
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(*view).format = ptr::null_mut();
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if (flags & ffi::PyBUF_FORMAT) == ffi::PyBUF_FORMAT {
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let msg = CStr::from_bytes_with_nul(b"B\0").unwrap();
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(*view).format = msg.as_ptr() as *mut _;
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}
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(*view).ndim = 1;
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(*view).shape = ptr::null_mut();
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if (flags & ffi::PyBUF_ND) == ffi::PyBUF_ND {
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(*view).shape = (&((*view).len)) as *const _ as *mut _;
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}
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(*view).strides = ptr::null_mut();
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if (flags & ffi::PyBUF_STRIDES) == ffi::PyBUF_STRIDES {
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(*view).strides = &((*view).itemsize) as *const _ as *mut _;
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}
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(*view).suboffsets = ptr::null_mut();
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(*view).internal = ptr::null_mut();
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}
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Ok(())
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}
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}
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