WRT

@OlivierBBB using GasProjector requires passing the frame, so executing the program. In this case, we need to know the cost before execution. That is the reason why I used that approach. For memory expansion, during execution we end up using a method of FrontierGasCalculator.class:

  public long memoryExpansionGasCost(MessageFrame frame, long offset, long length) {
    long pre = memoryCost((long)frame.memoryWordSize());
    long post = memoryCost(frame.calculateMemoryExpansion(offset, length));
    return post == Long.MAX_VALUE ? Long.MAX_VALUE : post - pre;
  }

that also requires the frame. Let's have a chat about it.

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