1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

//! @brief Solana Rust-based BPF program entry point supported by the original
//!  and now deprecated BPFLoader.  For more information see
//!  './bpf_loader_deprecated.rs'

extern crate alloc;
use crate::{account_info::AccountInfo, program_error::ProgramError, pubkey::Pubkey};
use alloc::vec::Vec;
use std::{
    cell::RefCell,
    mem::size_of,
    rc::Rc,
    // Hide Result from bindgen gets confused about generics in non-generic type declarations
    result::Result as ResultGeneric,
    slice::{from_raw_parts, from_raw_parts_mut},
};

pub type ProgramResult = ResultGeneric<(), ProgramError>;

/// User implemented function to process an instruction
///
/// program_id: Program ID of the currently executing program
/// accounts: Accounts passed as part of the instruction
/// instruction_data: Instruction data
pub type ProcessInstruction =
    fn(program_id: &Pubkey, accounts: &[AccountInfo], instruction_data: &[u8]) -> ProgramResult;

/// Programs indicate success with a return value of 0
pub const SUCCESS: u64 = 0;

/// Declare the entry point of the program.
///
/// Deserialize the program input arguments and call
/// the user defined `process_instruction` function.
/// Users must call this macro otherwise an entry point for
/// their program will not be created.
#[macro_export]
macro_rules! entrypoint_deprecated {
    ($process_instruction:ident) => {
        /// # Safety
        #[no_mangle]
        pub unsafe extern "C" fn entrypoint(input: *mut u8) -> u64 {
            let (program_id, accounts, instruction_data) =
                unsafe { $crate::entrypoint_deprecated::deserialize(input) };
            match $process_instruction(&program_id, &accounts, &instruction_data) {
                Ok(()) => $crate::entrypoint_deprecated::SUCCESS,
                Err(error) => error.into(),
            }
        }
    };
}

/// Deserialize the input arguments
///
/// # Safety
#[allow(clippy::type_complexity)]
pub unsafe fn deserialize<'a>(input: *mut u8) -> (&'a Pubkey, Vec<AccountInfo<'a>>, &'a [u8]) {
    let mut offset: usize = 0;

    // Number of accounts present

    #[allow(clippy::cast_ptr_alignment)]
    let num_accounts = *(input.add(offset) as *const u64) as usize;
    offset += size_of::<u64>();

    // Account Infos

    let mut accounts = Vec::with_capacity(num_accounts);
    for _ in 0..num_accounts {
        let dup_info = *(input.add(offset) as *const u8);
        offset += size_of::<u8>();
        if dup_info == std::u8::MAX {
            #[allow(clippy::cast_ptr_alignment)]
            let is_signer = *(input.add(offset) as *const u8) != 0;
            offset += size_of::<u8>();

            #[allow(clippy::cast_ptr_alignment)]
            let is_writable = *(input.add(offset) as *const u8) != 0;
            offset += size_of::<u8>();

            let key: &Pubkey = &*(input.add(offset) as *const Pubkey);
            offset += size_of::<Pubkey>();

            #[allow(clippy::cast_ptr_alignment)]
            let lamports = Rc::new(RefCell::new(&mut *(input.add(offset) as *mut u64)));
            offset += size_of::<u64>();

            #[allow(clippy::cast_ptr_alignment)]
            let data_len = *(input.add(offset) as *const u64) as usize;
            offset += size_of::<u64>();

            let data = Rc::new(RefCell::new({
                from_raw_parts_mut(input.add(offset), data_len)
            }));
            offset += data_len;

            let owner: &Pubkey = &*(input.add(offset) as *const Pubkey);
            offset += size_of::<Pubkey>();

            #[allow(clippy::cast_ptr_alignment)]
            let executable = *(input.add(offset) as *const u8) != 0;
            offset += size_of::<u8>();

            #[allow(clippy::cast_ptr_alignment)]
            let rent_epoch = *(input.add(offset) as *const u64);
            offset += size_of::<u64>();

            accounts.push(AccountInfo {
                is_signer,
                is_writable,
                key,
                lamports,
                data,
                owner,
                executable,
                rent_epoch,
            });
        } else {
            // Duplicate account, clone the original
            accounts.push(accounts[dup_info as usize].clone());
        }
    }

    // Instruction data

    #[allow(clippy::cast_ptr_alignment)]
    let instruction_data_len = *(input.add(offset) as *const u64) as usize;
    offset += size_of::<u64>();

    let instruction_data = { from_raw_parts(input.add(offset), instruction_data_len) };
    offset += instruction_data_len;

    // Program Id

    let program_id: &Pubkey = &*(input.add(offset) as *const Pubkey);

    (program_id, accounts, instruction_data)
}