March 2018
Beginner to intermediate
656 pages
20h 9m
English
Content preview from Mastering Blockchain - Second Edition
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Machine state
Machine state is also maintained internally by the EVM. Machine state is updated after each execution cycle of EVM. An iterator function (detailed in the next section) runs in the virtual machine, which outputs the results of a single cycle of the state machine.
Machine state is a tuple that consists of the following elements:
- Available gas
- The program counter, which is a positive integer up to 256 memory contents
- Contents of the stack
- Active number of words in memory
- Contents of the stack
The EVM is designed to handle exceptions and will halt (stop execution) in case any of the following exceptions occur:
- Not having enough gas required for execution invalid instructions
- Insufficient stack items
- Invalid destination of jump ...
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