Question 1

How does EOS VM ensure deterministic execution for blockchain smart contracts?

Accepted Answer

EOS VM provides softfloat implementation for floating-point arithmetic, which constrains rounding modes and handles NaNs/denormals to guarantee consistent results across platforms. This is essential for blockchain consensus where non-determinism can cause failures.

Question 2

EOS VM vs WAVM: which is better for running live blockchains?

Accepted Answer

EOS VM avoids the long and unpredictable compilation times of WAVM, making it more suitable for live blockchains that require fast contract validation and no recompilation on restart. However, WAVM might have faster raw execution in some benchmarks, but EOS VM prioritizes determinism and security.

Question 3

How to integrate EOS VM into a C++ project using CMake?

Accepted Answer

Add 'eos-vm' to your target_link_libraries in CMakeLists.txt, then include the headers. For single-threaded use, instantiate the backend type and register host functions via the simple API, as outlined in the Effortless Integration section.

Question 4

Can EOS VM be used for IoT or edge computing applications?

Accepted Answer

Yes, EOS VM's time-bounded execution features, such as instruction counting and watchdog timers, make it ideal for resource-constrained environments like IoT where preventing CPU overruns is critical, as mentioned in the Time Bounded Execution section.

Question 5

What security measures does EOS VM have against malicious WebAssembly code?

Accepted Answer

EOS VM employs guard paging to sandbox memory, bounds checks via invariant-preserving data types, and eliminates unbounded recursion/loops to prevent crashes or hangs. These design choices reduce the attack surface for untrusted code execution.

Question 6

How to set up watchdog timers in EOS VM for multi-threaded environments?

Accepted Answer

In multi-threaded setups, construct thread-specific watchdog timers and linear memory allocators, then register them to the Wasm backend. This incurs minimal overhead during execution, as detailed in the Time Bounded Execution and Integration sections.

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