core, core/vm: implemented a generic environment (#3348)

Environment is now a struct (not an interface). This
reduces a lot of tech-debt throughout the codebase where a virtual
machine environment had to be implemented in order to test or run it.

The new environment is suitable to be used en the json tests, core
consensus and light client.

core/vm/runtime/runtime.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/params"
@@ -49,6 +50,7 @@ type Config struct {
 	Value       *big.Int
 	DisableJit  bool // "disable" so it's enabled by default
 	Debug       bool
+	EVMConfig   vm.Config
 
 	State     *state.StateDB
 	GetHashFn func(n uint64) common.Hash
@@ -123,13 +125,37 @@ func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error) {
 		receiver.Address(),
 		input,
 		cfg.GasLimit,
-		cfg.GasPrice,
 		cfg.Value,
 	)
 
 	return ret, cfg.State, err
 }
 
+// Create executes the code using the EVM create method
+func Create(input []byte, cfg *Config) ([]byte, common.Address, error) {
+	if cfg == nil {
+		cfg = new(Config)
+	}
+	setDefaults(cfg)
+
+	if cfg.State == nil {
+		db, _ := ethdb.NewMemDatabase()
+		cfg.State, _ = state.New(common.Hash{}, db)
+	}
+	var (
+		vmenv  = NewEnv(cfg, cfg.State)
+		sender = cfg.State.CreateAccount(cfg.Origin)
+	)
+
+	// Call the code with the given configuration.
+	return vmenv.Create(
+		sender,
+		input,
+		cfg.GasLimit,
+		cfg.Value,
+	)
+}
+
 // Call executes the code given by the contract's address. It will return the
 // EVM's return value or an error if it failed.
 //
@@ -147,7 +173,6 @@ func Call(address common.Address, input []byte, cfg *Config) ([]byte, error) {
 		address,
 		input,
 		cfg.GasLimit,
-		cfg.GasPrice,
 		cfg.Value,
 	)