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Merge pull request #2308 from dusk-network/wallet-core-ffi
wallet-core: work on FFI
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| // | ||
| // Copyright (c) DUSK NETWORK. All rights reserved. | ||
|
|
||
| //! Implements `dbg!` and `eprintln!` macros, similar to those inthe Rust | ||
| //! standard library, with adaptations for use in a WASM environment. | ||
| //! | ||
| //! The `dbg!` macro outputs the value of an expression along with file and line | ||
| //! number details, useful for debugging. The `eprintln!` macro sends error | ||
| //! messages to the host environment. | ||
| //! | ||
| //! Unlike their standard counterparts, these macros are designed to be no-ops | ||
| //! in release builds, where optimizations are applied. This means no code is | ||
| //! generated for them in release mode, which improves performance and avoids | ||
| //! generating unnecessary debug information, as the WASM host environment is | ||
| //! expected to handle errors by aborting on panic, rather than logging. | ||
| #[cfg(debug_assertions)] | ||
| #[allow(unused_macros)] | ||
| #[macro_use] | ||
| pub mod enabled { | ||
| use alloc::vec::Vec; | ||
|
|
||
| extern "C" { | ||
| fn sig(msg: *const u8); // Host function expects a pointer to a C-style string (null-terminated) | ||
| } | ||
|
|
||
| // Converts a Rust string to a C-style string (null-terminated) | ||
| fn cstr(s: &str) -> Vec<u8> { | ||
| let mut bytes = Vec::with_capacity(s.len() + 1); // Allocate space for string + null terminator | ||
| bytes.extend_from_slice(s.as_bytes()); // Copy the string bytes | ||
| bytes.push(0); // Add the null terminator | ||
| bytes | ||
| } | ||
|
|
||
| // Send a signal to the host environment | ||
| pub(crate) fn signal(message: &str) { | ||
| let c_string = cstr(message); // Convert to C-string | ||
| unsafe { | ||
| sig(c_string.as_ptr()); // Send the C-string to the host function | ||
| } | ||
| } | ||
|
|
||
| macro_rules! eprintln { | ||
| // Match the format string with arguments (like the standard `println!`) | ||
| ($($arg:tt)*) => {{ | ||
| // Use `format!` to create the formatted string | ||
| let formatted = alloc::format!($($arg)*); | ||
| // Call the `signal` function with the resulting string | ||
| $crate::ffi::debug::enabled::signal(&formatted); | ||
| }}; | ||
| } | ||
|
|
||
| macro_rules! dbg { | ||
| () => { | ||
| eprintln!("[{}:{}:{}]", file!(), line!(), column!()) | ||
| }; | ||
| ($val:expr $(,)?) => { | ||
| // Use of `match` here is intentional because it affects the lifetimes | ||
| // of temporaries - https://stackoverflow.com/a/48732525/1063961 | ||
| match $val { | ||
| tmp => { | ||
| eprintln!("[{}:{}:{}] {} = {:#?}", | ||
| file!(), line!(), column!(), stringify!($val), &tmp); | ||
| tmp | ||
| } | ||
| } | ||
| }; | ||
| ($($val:expr),+ $(,)?) => { | ||
| ($(dbg!($val)),+,) | ||
| }; | ||
| } | ||
| } | ||
|
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||
| #[cfg(not(debug_assertions))] | ||
| #[allow(unused_macros)] | ||
| #[macro_use] | ||
| pub mod disabled { | ||
| macro_rules! dbg { | ||
| ($val:expr) => { | ||
| $val | ||
| }; | ||
| ($($arg:tt)*) => {}; | ||
| } | ||
| macro_rules! eprintln { | ||
| ($($arg:tt)*) => {}; | ||
| } | ||
| } |
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