Add libstd support to Rust BPF (#5788)

sdk/bpf/rust/rust-no-std/.gitignore

@@ -1,4 +0,0 @@
-/target/
-
-Cargo.lock
-/farf/

sdk/bpf/rust/rust-no-std/Cargo.toml

@@ -1,16 +0,0 @@
-
-[package]
-name = "solana-sdk-bpf-no-std"
-version = "0.19.0-pre0"
-description = "Solana BPF SDK Rust no_std support"
-authors = ["Solana Maintainers <maintainers@solana.com>"]
-repository = "https://github.com/solana-labs/solana"
-license = "Apache-2.0"
-homepage = "https://solana.com/"
-edition = "2018"
-
-[dependencies]
-solana-sdk-bpf-utils = { path = "../rust-utils" }
-
-[workspace]
-members = []

sdk/bpf/rust/rust-no-std/src/allocator.rs

@@ -1,23 +0,0 @@
-//! @brief Solana Rust-based BPF program memory allocator shim
-
-use core::alloc::{GlobalAlloc, Layout};
-use solana_sdk_bpf_utils::log::*;
-
-pub struct Allocator;
-unsafe impl GlobalAlloc for Allocator {
-    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
-        sol_alloc_free_(layout.size() as u64, 0)
-    }
-    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
-        sol_alloc_free_(layout.size() as u64, ptr as u64);
-    }
-}
-extern "C" {
-    fn sol_alloc_free_(size: u64, ptr: u64) -> *mut u8;
-}
-
-#[alloc_error_handler]
-fn my_alloc_error_handler(_: core::alloc::Layout) -> ! {
-    sol_log("alloc_error_handler");
-    panic!();
-}

sdk/bpf/rust/rust-no-std/src/lib.rs

@@ -1,20 +0,0 @@
-//! @brief Solana Rust-based BPF program utility functions and types
-
-#![no_std]
-#![feature(allocator_api)]
-#![feature(alloc_error_handler)]
-#![feature(panic_info_message)]
-#![feature(compiler_builtins_lib)]
-#![feature(lang_items)]
-#![cfg(not(test))]
-
-#[lang = "eh_personality"]
-extern "C" fn eh_personality() {}
-
-extern crate compiler_builtins;
-
-pub mod allocator;
-pub mod panic;
-
-#[global_allocator]
-static A: allocator::Allocator = allocator::Allocator;

sdk/bpf/rust/rust-no-std/src/panic.rs

@@ -1,32 +0,0 @@
-//! @brief Solana Rust-based BPF program panic handling
-
-use core::panic::PanicInfo;
-use core::ptr;
-
-#[panic_handler]
-fn panic(info: &PanicInfo) -> ! {
-    // Message is ignored for now to avoid incurring formatting overhead
-    match info.location() {
-        Some(location) => {
-            let mut file: [u8; 128] = [0; 128];
-            for (i, c) in location.file().as_bytes().iter().enumerate() {
-                if i > 127 {
-                    break;
-                }
-                file[i] = *c;
-            }
-            unsafe {
-                sol_panic_(
-                    file.as_ptr(),
-                    file.len() as u64,
-                    u64::from(location.line()),
-                    u64::from(location.column()),
-                );
-            }
-        }
-        None => unsafe { sol_panic_(ptr::null(), 0, 0, 0) },
-    }
-}
-extern "C" {
-    pub fn sol_panic_(file: *const u8, len: u64, line: u64, column: u64) -> !;
-}

sdk/bpf/rust/rust-utils/src/lib.rs

@@ -1,6 +1,4 @@
 //! @brief Solana Rust-based BPF program utility functions and types
 
-#![no_std]
-
 pub mod entrypoint;
 pub mod log;