Extract interface of VM into new VMFace class

libevm/VM.cpp

@@ -20,13 +20,21 @@
  */
 
 #include "VM.h"
+#include <libethereum/ExtVM.h>
 
-using namespace std;
 using namespace dev;
 using namespace dev::eth;
 
 void VM::reset(u256 _gas)
 {
-	m_gas = _gas;
+	VMFace::reset(_gas);
 	m_curPC = 0;
 }
+
+bytesConstRef VM::go(ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps)
+{
+	if (auto defaultExt = dynamic_cast<ExtVM*>(&_ext))
+		return go<ExtVM>(*defaultExt, _onOp, _steps);
+	else
+		return go<ExtVMFace>(_ext, _onOp, _steps);
+}

libevm/VM.h

@@ -27,6 +27,7 @@
 #include <libevmface/Instruction.h>
 #include <libdevcrypto/SHA3.h>
 #include <libethcore/BlockInfo.h>
+#include "VMFace.h"
 #include "FeeStructure.h"
 #include "ExtVMFace.h"
 
@@ -35,52 +36,29 @@ namespace dev
 namespace eth
 {
 
-struct VMException: virtual Exception {};
-struct StepsDone: virtual VMException {};
-struct BreakPointHit: virtual VMException {};
-struct BadInstruction: virtual VMException {};
-struct BadJumpDestination: virtual VMException {};
-struct OutOfGas: virtual VMException {};
-class StackTooSmall: virtual public VMException { public: StackTooSmall(u256 _req, u256 _got): req(_req), got(_got) {} u256 req; u256 got; };
-
-// Convert from a 256-bit integer stack/memory entry into a 160-bit Address hash.
-// Currently we just pull out the right (low-order in BE) 160-bits.
-inline Address asAddress(u256 _item)
-{
-	return right160(h256(_item));
-}
-
-inline u256 fromAddress(Address _a)
-{
-	return (u160)_a;
-//	h256 ret;
-//	memcpy(&ret, &_a, sizeof(_a));
-//	return ret;
-}
-
 /**
  */
-class VM
+class VM : public VMFace
 {
 public:
 	/// Construct VM object.
-	explicit VM(u256 _gas = 0) { reset(_gas); }
+	explicit VM(u256 _gas = 0): VMFace(_gas) {}
 
-	void reset(u256 _gas = 0);
+	virtual void reset(u256 _gas = 0) override final;
 
-	template <class Ext>
-	bytesConstRef go(Ext& _ext, OnOpFunc const& _onOp = OnOpFunc(), uint64_t _steps = (uint64_t)-1);
+	virtual bytesConstRef go(ExtVMFace& _ext, OnOpFunc const& _onOp = {}, uint64_t _steps = (uint64_t)-1) override final;
 
 	void require(u256 _n) { if (m_stack.size() < _n) BOOST_THROW_EXCEPTION(StackTooSmall(_n, m_stack.size())); }
 	void requireMem(unsigned _n) { if (m_temp.size() < _n) { m_temp.resize(_n); } }
-	u256 gas() const { return m_gas; }
 	u256 curPC() const { return m_curPC; }
 
 	bytes const& memory() const { return m_temp; }
 	u256s const& stack() const { return m_stack; }
 
 private:
-	u256 m_gas = 0;
+	template <class Ext>
+	bytesConstRef go(Ext& _ext, OnOpFunc const& _onOp, uint64_t _steps);
+
 	u256 m_curPC = 0;
 	bytes m_temp;
 	u256s m_stack;

libevm/VMFace.cpp

@@ -0,0 +1,19 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-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.
+
+	cpp-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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "VM.h"
+

libevm/VMFace.h

@@ -0,0 +1,75 @@
+/*
+	This file is part of cpp-ethereum.
+
+	cpp-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.
+
+	cpp-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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <libdevcore/Exceptions.h>
+#include "ExtVMFace.h"
+
+namespace dev
+{
+namespace eth
+{
+
+struct VMException: virtual Exception {};
+struct StepsDone: virtual VMException {};
+struct BreakPointHit: virtual VMException {};
+struct BadInstruction: virtual VMException {};
+struct BadJumpDestination: virtual VMException {};
+struct OutOfGas: virtual VMException {};
+class StackTooSmall: virtual public VMException { public: StackTooSmall(u256 _req, u256 _got): req(_req), got(_got) {} u256 req; u256 got; };
+
+// Convert from a 256-bit integer stack/memory entry into a 160-bit Address hash.
+// Currently we just pull out the right (low-order in BE) 160-bits.
+inline Address asAddress(u256 _item)
+{
+	return right160(h256(_item));
+}
+
+inline u256 fromAddress(Address _a)
+{
+	return (u160)_a;
+	//	h256 ret;
+	//	memcpy(&ret, &_a, sizeof(_a));
+	//	return ret;
+}
+
+/**
+ */
+class VMFace
+{
+public:
+	/// Construct VM object.
+	explicit VMFace(u256 _gas = 0): m_gas(_gas) {}
+
+	virtual ~VMFace() = default;
+
+	VMFace(VMFace const&) = delete;
+	void operator=(VMFace const&) = delete;
+
+	virtual void reset(u256 _gas = 0) { m_gas = _gas; }
+
+	virtual bytesConstRef go(ExtVMFace& _ext, OnOpFunc const& _onOp = {}, uint64_t _steps = (uint64_t)-1) = 0;
+
+	u256 gas() const { return m_gas; }
+
+protected:
+	u256 m_gas = 0;
+};
+
+}
+}

windows/LibEthereum.vcxproj

@@ -141,6 +141,7 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
+    <ClCompile Include="..\libevm\VMFace.cpp" />
     <ClCompile Include="..\libevm\_libevm.cpp" />
     <ClCompile Include="..\liblll\Assembly.cpp" />
     <ClCompile Include="..\liblll\CodeFragment.cpp" />
@@ -360,6 +361,7 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClInclude>
+    <ClInclude Include="..\libevm\VMFace.h" />
     <ClInclude Include="..\liblll\All.h" />
     <ClInclude Include="..\liblll\Assembly.h" />
     <ClInclude Include="..\liblll\CodeFragment.h" />

windows/LibEthereum.vcxproj.filters

@@ -193,6 +193,9 @@
     <ClCompile Include="..\libethcore\Exceptions.cpp">
       <Filter>libethcore</Filter>
     </ClCompile>
+    <ClCompile Include="..\libevm\VMFace.cpp">
+      <Filter>libevm</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="stdafx.h">
@@ -417,6 +420,9 @@
     <ClInclude Include="..\libwebthree\webthree.h">
       <Filter>libwebthree</Filter>
     </ClInclude>
+    <ClInclude Include="..\libevm\VMFace.h">
+      <Filter>libevm</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="Windows">