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core/vm: added a comment regarding the uint64 vs *big.Int

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obscuren 2015-06-11 11:59:30 +02:00
parent 9e9bd35557
commit f599a1b5f1
1 changed files with 3 additions and 1 deletions
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4
core/vm/vm.go
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@ -76,8 +76,10 @@ func (self *Vm) Run(context *Context, input []byte) (ret []byte, err error) {
codehash = crypto.Sha3Hash(code) // codehash is used when doing jump dest caching codehash = crypto.Sha3Hash(code) // codehash is used when doing jump dest caching
mem = NewMemory() // bound memory mem = NewMemory() // bound memory
stack = newstack() // local stack stack = newstack() // local stack
pc = uint64(0) // program counter
statedb = self.env.State() // current state statedb = self.env.State() // current state
// For optimisation reason we're using uint64 as the program counter.
// It's theoretically possible to go above 2^64. The YP defines the PC to be uint256. Pratically much less so feasible.
pc = uint64(0) // program counter
// jump evaluates and checks whether the given jump destination is a valid one // jump evaluates and checks whether the given jump destination is a valid one
// if valid move the `pc` otherwise return an error. // if valid move the `pc` otherwise return an error.