bank: do not remove trailing 0 bytes from return data (#33639)
This is creating havoc for Solang, as the return data is borsh encoded and therefore `u64` values like 0x100 get truncated.
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@ -4955,7 +4955,7 @@ impl Bank {
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let ExecutionRecord {
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accounts,
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mut return_data,
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return_data,
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touched_account_count,
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accounts_resize_delta,
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} = transaction_context.into();
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@ -4977,16 +4977,10 @@ impl Bank {
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saturating_add_assign!(timings.details.changed_account_count, touched_account_count);
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let accounts_data_len_delta = status.as_ref().map_or(0, |_| accounts_resize_delta);
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let return_data = if enable_return_data_recording {
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if let Some(end_index) = return_data.data.iter().rposition(|&x| x != 0) {
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let end_index = end_index.saturating_add(1);
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return_data.data.truncate(end_index);
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let return_data = if enable_return_data_recording && !return_data.data.is_empty() {
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Some(return_data)
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} else {
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None
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}
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} else {
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None
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};
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TransactionExecutionResult::Executed {
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@ -9713,9 +9713,9 @@ fn test_tx_return_data() {
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let mut return_data = [0u8; MAX_RETURN_DATA];
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if !instruction_data.is_empty() {
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let index = usize::from_le_bytes(instruction_data.try_into().unwrap());
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return_data[index] = 1;
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return_data[index / 2] = 1;
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transaction_context
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.set_return_data(mock_program_id, return_data.to_vec())
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.set_return_data(mock_program_id, return_data[..index + 1].to_vec())
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.unwrap();
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}
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Ok(())
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@ -9767,8 +9767,9 @@ fn test_tx_return_data() {
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if let Some(index) = index {
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let return_data = return_data.unwrap();
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assert_eq!(return_data.program_id, mock_program_id);
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let mut expected_data = vec![0u8; index];
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expected_data.push(1u8);
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let mut expected_data = vec![0u8; index + 1];
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// include some trailing zeros
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expected_data[index / 2] = 1;
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assert_eq!(return_data.data, expected_data);
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} else {
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assert!(return_data.is_none());
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