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authorobscuren <geffobscura@gmail.com>2015-06-11 17:59:30 +0800
committerobscuren <geffobscura@gmail.com>2015-06-11 17:59:30 +0800
commitf599a1b5f143503817c9fa411854b9a8dac6ba72 (patch)
tree0de1bc604e749e1da0707d659edcc5191183affa
parent9e9bd3555789f069b6cb1950fe329d307f951eab (diff)
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core/vm: added a comment regarding the uint64 vs *big.Int
-rw-r--r--core/vm/vm.go4
1 files changed, 3 insertions, 1 deletions
diff --git a/core/vm/vm.go b/core/vm/vm.go
index 117331389..4c0ab0f47 100644
--- a/core/vm/vm.go
+++ b/core/vm/vm.go
@@ -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
mem = NewMemory() // bound memory
stack = newstack() // local stack
- pc = uint64(0) // program counter
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
// if valid move the `pc` otherwise return an error.