This package contains various tools to interact with the Ethereum virtual machine.
The 'compiler' is a tool to build evm binaries, using a pythonic way to construct the programs using assembly.
Here's an example that tests ecdsaRecover:
p = compiler.Program()
p.mstore(0 ,0x38d18acb67d25c8bb9942764b62f18e17054f66a817bd4295423adf9ed98873e)
v = 0x000000000000000000000000000000000000000000000000000000000000001b
p.mstore(32 , v)
p.mstore(64 ,0x723841761d213b60ac1cbf063207cbeba6c2725bcaf7c189e63f13d93fc1dc07)
p.mstore(96 ,0x789d1dd423d25f0772d2748d60f7e4b81bb14d086eba8e8e8efb6dcff8a4ae02)
p.call(0xfff,1,0,0,0x80,0x80,0x20)
p.rreturn(140,20)
code = p.bytecode()Here's an example of stuffing JUMPDEST into a program:
p = compiler.Program()
p.jump(0x3)
p.jumpdest()
p.rreturn()
for i in range(0,20000):
p.op(JUMPDEST)
return p.bytecode()The gethvm provides some ability to execute the evm from geth.
Example:
vm = gethvm.VM(evmbin)
output = vm.execute(code = bootstrap, genesis = g_path, json = True)The etherchain package contains an API for interacting with the Etherchain API.
An example app is reproduce.py which can reproduce an on-chain transaction as a totally local event, and run it in the evm.
The app takes a txhash, and
- Fetch the transaction data from an API.
- Mark (source, destination) as need-to-fetch
- Fetch balance and nonce at source, add to
genesis - Execute transaction on the
evm - If transaction has any externally reaching ops (BALANCE, EXTCODECOPY, CALL etc),
- Add those accounts as need-to-fetch
- Go back to 3 until the execution does not result in any more accounts to be fetched.
- Save the transaction trace and genesis