web3api_wasm_rs/
malloc.rs

1/// Allocate memory into the module's linear memory
2/// and return the offset to the start of the block.
3#[no_mangle]
4pub fn alloc(len: usize) -> *mut u8 {
5    // create a new mutable buffer with capacity `len`
6    let mut buf = Vec::with_capacity(len);
7    // take a mutable pointer to the buffer
8    let ptr = buf.as_mut_ptr();
9    // take ownership of the memory block and
10    // ensure the its destructor is not
11    // called when the object goes out of scope
12    // at the end of the function
13    std::mem::forget(buf);
14    // return the pointer so the runtime
15    // can write data at this offset
16    ptr
17}
18
19#[no_mangle]
20pub unsafe fn dealloc(ptr: *mut u8, size: usize) {
21    let data = Vec::from_raw_parts(ptr, size, size);
22    std::mem::drop(data);
23}
web3api_wasm_rs/malloc.rs

web3api_wasm_rs/
malloc.rs
