core, core/vm, tests: changed the initialisation behaviour of the EVM

The EVM was previously initialised and created for every CALL, CALLCODE,
DELEGATECALL and CREATE. This PR changes this behaviour so that the same
EVM can be used through the session and beyond as long as the
Environment sticks around.

1 files changed, 8 insertions, 1 deletions

diff --git a/cmd/evm/main.go b/cmd/evm/main.go
index ef679e373..0ba6820e0 100644
--- a/cmd/evm/main.go
+++ b/cmd/evm/main.go
@@ -33,6 +33,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 var (
@@ -174,17 +175,23 @@ type VMEnv struct {
 	Gas   *big.Int
 	time  *big.Int
 	logs  []vm.StructLog
+
+	evm *vm.Vm
 }
 
 func NewEnv(state *state.StateDB, transactor common.Address, value *big.Int) *VMEnv {
-	return &VMEnv{
+	params.HomesteadBlock = new(big.Int)
+	env := &VMEnv{
 		state:      state,
 		transactor: &transactor,
 		value:      value,
 		time:       big.NewInt(time.Now().Unix()),
 	}
+	env.evm = vm.EVM(env)
+	return env
 }
 
+func (self *VMEnv) Vm() *vm.Vm                 { return self.evm }
 func (self *VMEnv) Db() vm.Database            { return self.state }
 func (self *VMEnv) MakeSnapshot() vm.Database  { return self.state.Copy() }
 func (self *VMEnv) SetSnapshot(db vm.Database) { self.state.Set(db.(*state.StateDB)) }