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, 7 insertions, 1 deletions

diff --git a/tests/util.go b/tests/util.go
index 29f4c9b72..2c749edba 100644
--- a/tests/util.go
+++ b/tests/util.go
@@ -143,12 +143,15 @@ type Env struct {
 	logs []vm.StructLog
 
 	vmTest bool
+
+	evm *vm.Vm
 }
 
 func NewEnv(state *state.StateDB) *Env {
-	return &Env{
+	env := &Env{
 		state: state,
 	}
+	return env
 }
 
 func (self *Env) StructLogs() []vm.StructLog {
@@ -171,9 +174,12 @@ func NewEnvFromMap(state *state.StateDB, envValues map[string]string, exeValues
 	env.gasLimit = common.Big(envValues["currentGasLimit"])
 	env.Gas = new(big.Int)
 
+	env.evm = vm.EVM(env)
+
 	return env
 }
 
+func (self *Env) Vm() *vm.Vm               { return self.evm }
 func (self *Env) Origin() common.Address   { return self.origin }
 func (self *Env) BlockNumber() *big.Int    { return self.number }
 func (self *Env) Coinbase() common.Address { return self.coinbase }