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Read the bytecode at a given offset #31

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Bernardstanislas opened this issue Oct 16, 2022 · 1 comment
Open

Read the bytecode at a given offset #31

Bernardstanislas opened this issue Oct 16, 2022 · 1 comment
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Context: intricated deep understanding of the codebase required Difficulty: intermediate require some notions, but can be learned while doing Duration: 1 day will take about one day Techno: cairo cairo Type: feature a new feature to implement

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@Bernardstanislas
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Context

pc points at the instruction currently being processed by the EVM, and is represented as a byte offset in the bytecode.

Goal

Have an internal function to read the current opcode at a given pc value. Keep in mind that some opcodes are expressed on several bytes, because they hold a value alongside with the actual opcode value. PUSH1 is one of these for example.

Expectations

  • have a function that can be called with a pc value and returns the opcode at the given offset
  • this function should be usable by In-memory program counter and JUMP opcode implementation #30 to check that the opcode at a jump destination is actually a JUMPDEST
  • find how to deal with variable size of opcodes decoding, one byte for JUMPDEST for example, and two bytes for PUSH1
@Bernardstanislas Bernardstanislas added Difficulty: intermediate require some notions, but can be learned while doing Type: feature a new feature to implement Context: intricated deep understanding of the codebase required Techno: cairo cairo Duration: 1 day will take about one day labels Oct 16, 2022
@DIWAKARKASHYAP
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i want to work on this issue

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Context: intricated deep understanding of the codebase required Difficulty: intermediate require some notions, but can be learned while doing Duration: 1 day will take about one day Techno: cairo cairo Type: feature a new feature to implement
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@Bernardstanislas @DIWAKARKASHYAP