cmd/evm, core/vm, test: refactored VM and core

* Moved `vm.Transfer` to `core` package and changed execution to call
`env.Transfer` instead of `core.Transfer` directly.
* core/vm: byte code VM moved to jump table instead of switch
* Moved `vm.Transfer` to `core` package and changed execution to call
  `env.Transfer` instead of `core.Transfer` directly.
* Byte code VM now shares the same code as the JITVM
* Renamed Context to Contract
* Changed initialiser of state transition & unexported methods
* Removed the Execution object and refactor `Call`, `CallCode` &
  `Create` in to their own functions instead of being methods.
* Removed the hard dep on the state for the VM. The VM now
  depends on a Database interface returned by the environment. In the
  process the core now depends less on the statedb by usage of the env
* Moved `Log` from package `core/state` to package `core/vm`.

1 files changed, 5 insertions, 5 deletions

diff --git a/core/vm/contracts.go b/core/vm/contracts.go
index b965fa095..22cb9eab2 100644
--- a/core/vm/contracts.go
+++ b/core/vm/contracts.go
@@ -26,22 +26,22 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 )
 
-type Address interface {
-	Call(in []byte) []byte
-}
-
+// PrecompiledAccount represents a native ethereum contract
 type PrecompiledAccount struct {
 	Gas func(l int) *big.Int
 	fn  func(in []byte) []byte
 }
 
+// Call calls the native function
 func (self PrecompiledAccount) Call(in []byte) []byte {
 	return self.fn(in)
 }
 
+// Precompiled contains the default set of ethereum contracts
 var Precompiled = PrecompiledContracts()
 
-// XXX Could set directly. Testing requires resetting and setting of pre compiled contracts.
+// PrecompiledContracts returns the default set of precompiled ethereum
+// contracts defined by the ethereum yellow paper.
 func PrecompiledContracts() map[string]*PrecompiledAccount {
 	return map[string]*PrecompiledAccount{
 		// ECRECOVER