How Does the Compiler Handle Assembly Code regarding Integer Checks?
The Solidity compiler's automatic integer overflow and underflow checks are only applied to the high-level Solidity code. When a developer uses inline assembly (Yul), they are directly writing EVM opcodes, and the compiler assumes the developer knows what they are doing.
Therefore, the compiler does not insert any automatic safety checks for arithmetic operations within assembly blocks. Developers must manually implement their own checks or ensure the logic is safe, making assembly code a high-risk area for integer vulnerabilities.
Glossar
Integer Overflow and Underflow
Calculation ⎊ Integer overflow and underflow refer to critical vulnerabilities in smart contract arithmetic where calculations exceed the maximum or fall below the minimum value representable by a variable type.
Code
Algorithm ⎊ Code, within cryptocurrency, options trading, and financial derivatives, represents a defined set of instructions enabling automated execution of trading strategies or complex calculations related to pricing and risk assessment.