move libevmasm

1 files changed, 123 insertions, 0 deletions

diff --git a/libevmasm/AssemblyItem.h b/libevmasm/AssemblyItem.h
new file mode 100644
index 00000000..795b5a8a
--- /dev/null
+++ b/libevmasm/AssemblyItem.h
@@ -0,0 +1,123 @@
+/*
+	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/>.
+*/
+/** @file Assembly.h
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ */
+
+#pragma once
+
+#include <iostream>
+#include <sstream>
+#include <libdevcore/Common.h>
+#include <libdevcore/Assertions.h>
+#include <libevmcore/Instruction.h>
+#include <libevmasm/SourceLocation.h>
+#include "Exceptions.h"
+
+namespace dev
+{
+namespace eth
+{
+
+enum AssemblyItemType {
+	UndefinedItem,
+	Operation,
+	Push,
+	PushString,
+	PushTag,
+	PushSub,
+	PushSubSize,
+	PushProgramSize,
+	Tag,
+	PushData,
+	PushLibraryAddress ///< Push a currently unknown address of another (library) contract.
+};
+
+class Assembly;
+
+class AssemblyItem
+{
+public:
+	enum class JumpType { Ordinary, IntoFunction, OutOfFunction };
+
+	AssemblyItem(u256 _push, SourceLocation const& _location = SourceLocation()):
+		AssemblyItem(Push, _push, _location) { }
+	AssemblyItem(Instruction _i, SourceLocation const& _location = SourceLocation()):
+		AssemblyItem(Operation, byte(_i), _location) { }
+	AssemblyItem(AssemblyItemType _type, u256 _data = 0, SourceLocation const& _location = SourceLocation()):
+		m_type(_type),
+		m_data(_data),
+		m_location(_location)
+	{
+	}
+
+	AssemblyItem tag() const { assertThrow(m_type == PushTag || m_type == Tag, Exception, ""); return AssemblyItem(Tag, m_data); }
+	AssemblyItem pushTag() const { assertThrow(m_type == PushTag || m_type == Tag, Exception, ""); return AssemblyItem(PushTag, m_data); }
+
+	AssemblyItemType type() const { return m_type; }
+	u256 const& data() const { return m_data; }
+	void setType(AssemblyItemType const _type) { m_type = _type; }
+	void setData(u256 const& _data) { m_data = _data; }
+
+	/// @returns the instruction of this item (only valid if type() == Operation)
+	Instruction instruction() const { return Instruction(byte(m_data)); }
+
+	/// @returns true if the type and data of the items are equal.
+	bool operator==(AssemblyItem const& _other) const { return m_type == _other.m_type && m_data == _other.m_data; }
+	bool operator!=(AssemblyItem const& _other) const { return !operator==(_other); }
+	/// Less-than operator compatible with operator==.
+	bool operator<(AssemblyItem const& _other) const { return std::tie(m_type, m_data) < std::tie(_other.m_type, _other.m_data); }
+
+	/// @returns an upper bound for the number of bytes required by this item, assuming that
+	/// the value of a jump tag takes @a _addressLength bytes.
+	unsigned bytesRequired(unsigned _addressLength) const;
+	int deposit() const;
+
+	bool match(AssemblyItem const& _i) const { return _i.m_type == UndefinedItem || (m_type == _i.m_type && (m_type != Operation || m_data == _i.m_data)); }
+	void setLocation(SourceLocation const& _location) { m_location = _location; }
+	SourceLocation const& location() const { return m_location; }
+
+	void setJumpType(JumpType _jumpType) { m_jumpType = _jumpType; }
+	JumpType getJumpType() const { return m_jumpType; }
+	std::string getJumpTypeAsString() const;
+
+	void setPushedValue(u256 const& _value) const { m_pushedValue = std::make_shared<u256>(_value); }
+	u256 const* pushedValue() const { return m_pushedValue.get(); }
+
+private:
+	AssemblyItemType m_type;
+	u256 m_data;
+	SourceLocation m_location;
+	JumpType m_jumpType = JumpType::Ordinary;
+	/// Pushed value for operations with data to be determined during assembly stage,
+	/// e.g. PushSubSize, PushTag, PushSub, etc.
+	mutable std::shared_ptr<u256> m_pushedValue;
+};
+
+using AssemblyItems = std::vector<AssemblyItem>;
+
+std::ostream& operator<<(std::ostream& _out, AssemblyItem const& _item);
+inline std::ostream& operator<<(std::ostream& _out, AssemblyItems const& _items)
+{
+	for (AssemblyItem const& item: _items)
+		_out << item;
+	return _out;
+}
+
+}
+}