Do over/underflow checks for addition (SafeMath) #265
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| @@ -239,7 +239,10 @@ pub fn expr_bin_operation( | |||
| .typ; | |||
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| return match op.node { | |||
| fe::BinOperator::Add => Ok(expression! { add([yul_left], [yul_right]) }), | |||
| fe::BinOperator::Add => match typ.is_signed_integer() { | |||
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i imagine at some point we'll add more checking functions for smaller integers?
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Ah, good point. I will expand this PR to include checks for all integer sizes for additions.
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Ok, done. Additions for all supported sizes should now be checked.
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Codecov Report
@@ Coverage Diff @@
## master #265 +/- ##
==========================================
- Coverage 94.03% 94.00% -0.04%
==========================================
Files 54 55 +1
Lines 3791 3834 +43
==========================================
+ Hits 3565 3604 +39
- Misses 226 230 +4
Continue to review full report at Codecov.
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looks great 👍 |
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What was wrong?
As explained in #153 artihmetic operations should check for under/overflows by default and revert if such are detected.
How was it fixed?
This adds checks for all additions of both signed and unsigned integers.
checked_add_u256andchecked_add_i256functions to runtimefe::BinOperator::Addin mapper