From d30571a7a84de5a1a3287e764210a3803d7a307f Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Mon, 10 Nov 2014 11:47:37 +0100
Subject: [PATCH] Added VM testing tool

---
 cmd/evm/main.go | 109 ++++++++++++++++++++++++++++++++++++++++++++++++
 vm/vm_debug.go  |   3 +-
 vm/vm_test.go   |  18 ++++++++
 3 files changed, 128 insertions(+), 2 deletions(-)
 create mode 100644 cmd/evm/main.go

diff --git a/cmd/evm/main.go b/cmd/evm/main.go
new file mode 100644
index 000000000..984fd6c57
--- /dev/null
+++ b/cmd/evm/main.go
@@ -0,0 +1,109 @@
+/*
+	This file is part of go-ethereum
+
+	go-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	go-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @authors
+ * 	Jeffrey Wilcke <i@jev.io>
+ * @date 2014
+ *
+ */
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"math/big"
+	"os"
+	"runtime"
+	"time"
+
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/state"
+	"github.com/ethereum/go-ethereum/trie"
+	"github.com/ethereum/go-ethereum/vm"
+)
+
+var (
+	code     = flag.String("code", "", "evm code")
+	loglevel = flag.Int("log", 4, "log level")
+	gas      = flag.String("gas", "1000000", "gas amount")
+	price    = flag.String("price", "0", "gas price")
+	dump     = flag.Bool("dump", false, "dump state after run")
+)
+
+func perr(v ...interface{}) {
+	fmt.Println(v...)
+	//os.Exit(1)
+}
+
+func main() {
+	flag.Parse()
+
+	logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, log.LstdFlags, logger.LogLevel(*loglevel)))
+
+	ethutil.ReadConfig(".ethtest", "/tmp/evm", "")
+
+	stateObject := state.NewStateObject([]byte("evmuser"))
+	closure := vm.NewClosure(nil, stateObject, stateObject, ethutil.Hex2Bytes(*code), ethutil.Big(*gas), ethutil.Big(*price))
+
+	tstart := time.Now()
+
+	ret, _, e := closure.Call(vm.New(NewVmEnv(), vm.DebugVmTy), nil)
+
+	logger.Flush()
+	if e != nil {
+		perr(e)
+	}
+
+	var mem runtime.MemStats
+	runtime.ReadMemStats(&mem)
+	fmt.Printf("vm took %v\n", time.Since(tstart))
+	fmt.Printf(`alloc:      %d
+tot alloc:  %d
+no. malloc: %d
+heap alloc: %d
+heap objs:  %d
+num gc:     %d
+`, mem.Alloc, mem.TotalAlloc, mem.Mallocs, mem.HeapAlloc, mem.HeapObjects, mem.NumGC)
+
+	fmt.Printf("%x\n", ret)
+}
+
+type VmEnv struct {
+	state *state.State
+}
+
+func NewVmEnv() *VmEnv {
+	return &VmEnv{state.New(trie.New(nil, ""))}
+}
+
+func (VmEnv) Origin() []byte            { return nil }
+func (VmEnv) BlockNumber() *big.Int     { return nil }
+func (VmEnv) BlockHash() []byte         { return nil }
+func (VmEnv) PrevHash() []byte          { return nil }
+func (VmEnv) Coinbase() []byte          { return nil }
+func (VmEnv) Time() int64               { return 0 }
+func (VmEnv) GasLimit() *big.Int        { return nil }
+func (VmEnv) Difficulty() *big.Int      { return nil }
+func (VmEnv) Value() *big.Int           { return nil }
+func (self *VmEnv) State() *state.State { return self.state }
+func (VmEnv) AddLog(state.Log)          {}
+func (VmEnv) Transfer(from, to vm.Account, amount *big.Int) error {
+	return nil
+}
diff --git a/vm/vm_debug.go b/vm/vm_debug.go
index ce7a29f99..2d34758f5 100644
--- a/vm/vm_debug.go
+++ b/vm/vm_debug.go
@@ -50,8 +50,7 @@ func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
 				ret = closure.Return(nil)
 
 				err = fmt.Errorf("%v", r)
-				// No error should be set. Recover is used with require
-				// Is this too error prone?
+
 			}
 		}()
 	}
diff --git a/vm/vm_test.go b/vm/vm_test.go
index f5d77cbff..948dd835f 100644
--- a/vm/vm_test.go
+++ b/vm/vm_test.go
@@ -169,3 +169,21 @@ func TestBuildInRipemd(t *testing.T) {
 		t.Errorf("Expected %x, got %x", exp, ret)
 	}
 }
+
+func TestOog(t *testing.T) {
+	// This tests takes a long time and will eventually run out of gas
+	//t.Skip()
+
+	logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, log.LstdFlags, logger.InfoLevel))
+
+	ethutil.ReadConfig(".ethtest", "/tmp/ethtest", "")
+
+	stateObject := state.NewStateObject([]byte{'j', 'e', 'f', 'f'})
+	closure := NewClosure(nil, stateObject, stateObject, ethutil.Hex2Bytes("60ff60ff600057"), big.NewInt(1000000), big.NewInt(0))
+
+	vm := New(TestEnv{}, DebugVmTy)
+	_, _, e := closure.Call(vm, nil)
+	if e != nil {
+		fmt.Println(e)
+	}
+}