Add module level docs

sdk/src/entrypoint.rs

@@ -1,3 +1,6 @@
+//! Macros and functions for defining the program entrypoint and setting up
+//! global handlers.
+
 use core::{alloc::Layout, mem::size_of, ptr::null_mut, slice::from_raw_parts};
 
 use crate::{
@@ -150,11 +153,7 @@ pub unsafe fn deserialize<'a, const MAX_ACCOUNTS: usize>(
 
     let processed = if total_accounts > 0 {
         // number of accounts to process (limited to MAX_ACCOUNTS)
-        let processed = if total_accounts > MAX_ACCOUNTS {
-            MAX_ACCOUNTS
-        } else {
-            total_accounts
-        };
+        let processed = core::cmp::min(total_accounts, MAX_ACCOUNTS);
 
         for i in 0..processed {
             let duplicate = *(input.add(offset) as *const u8);
@@ -171,7 +170,7 @@ pub unsafe fn deserialize<'a, const MAX_ACCOUNTS: usize>(
 
                 accounts[i].write(AccountInfo { raw: account_info });
             } else {
-                offset += 8;
+                offset += core::mem::size_of::<u64>();
                 // duplicate account, clone the original pointer
                 accounts[i].write(accounts[duplicate as usize].assume_init_ref().clone());
             }
@@ -191,7 +190,7 @@ pub unsafe fn deserialize<'a, const MAX_ACCOUNTS: usize>(
                 offset += (offset as *const u8).align_offset(BPF_ALIGN_OF_U128);
                 offset += core::mem::size_of::<u64>();
             } else {
-                offset += 8;
+                offset += core::mem::size_of::<u64>();
             }
         }
 
@@ -202,7 +201,6 @@ pub unsafe fn deserialize<'a, const MAX_ACCOUNTS: usize>(
     };
 
     // instruction data
-    #[allow(clippy::cast_ptr_alignment)]
     let instruction_data_len = *(input.add(offset) as *const u64) as usize;
     offset += core::mem::size_of::<u64>();
 

sdk/src/instruction.rs

@@ -1,3 +1,5 @@
+//! Instruction types.
+
 use core::marker::PhantomData;
 
 use crate::{account_info::AccountInfo, pubkey::Pubkey};

sdk/src/lib.rs

@@ -7,7 +7,6 @@
 //!
 //! [`solana-sdk`]: https://docs.rs/solana-sdk/latest/solana_sdk/
 //! [`solana-program`]: https://docs.rs/solana-program/latest/solana_program/
-//!
 
 #![no_std]
 

sdk/src/program.rs

@@ -1,3 +1,5 @@
+//! Cross-program invocation helpers.
+
 use core::mem::MaybeUninit;
 
 use crate::{

sdk/src/pubkey.rs

@@ -1,3 +1,5 @@
+//! Public key type and functions.
+
 /// maximum length of derived `Pubkey` seed
 pub const MAX_SEED_LEN: usize = 32;
 

sdk/src/syscalls.rs

@@ -1,3 +1,5 @@
+//! Syscall functions.
+
 use crate::{
     instruction::{AccountMeta, ProcessedSiblingInstruction},
     pubkey::Pubkey,

sdk/src/sysvars/mod.rs

@@ -1,4 +1,4 @@
-//! Provides access to system accounts.
+//! Provides access to cluster system accounts.
 
 use crate::program_error::ProgramError;
 

sdk/src/sysvars/rent.rs

@@ -1,4 +1,4 @@
-//! This account contains the current cluster rent
+//! This account contains the current cluster rent.
 //!
 //! This is required for the rent sysvar implementation.