move libevmasm

1 files changed, 151 insertions, 0 deletions

diff --git a/libevmasm/Assembly.h b/libevmasm/Assembly.h
new file mode 100644
index 00000000..28328277
--- /dev/null
+++ b/libevmasm/Assembly.h
@@ -0,0 +1,151 @@
+/*
+	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 <libdevcore/SHA3.h>
+#include <libevmcore/Instruction.h>
+#include <libevmasm/SourceLocation.h>
+#include <libevmasm/AssemblyItem.h>
+#include <libevmasm/LinkerObject.h>
+#include "Exceptions.h"
+#include <json/json.h>
+
+namespace Json
+{
+class Value;
+}
+namespace dev
+{
+namespace eth
+{
+
+class Assembly
+{
+public:
+	Assembly() {}
+
+	AssemblyItem newTag() { return AssemblyItem(Tag, m_usedTags++); }
+	AssemblyItem newPushTag() { return AssemblyItem(PushTag, m_usedTags++); }
+	AssemblyItem newData(bytes const& _data) { h256 h(sha3(asString(_data))); m_data[h] = _data; return AssemblyItem(PushData, h); }
+	AssemblyItem newSub(Assembly const& _sub) { m_subs.push_back(_sub); return AssemblyItem(PushSub, m_subs.size() - 1); }
+	Assembly const& sub(size_t _sub) const { return m_subs.at(_sub); }
+	Assembly& sub(size_t _sub) { return m_subs.at(_sub); }
+	AssemblyItem newPushString(std::string const& _data) { h256 h(sha3(_data)); m_strings[h] = _data; return AssemblyItem(PushString, h); }
+	AssemblyItem newPushSubSize(u256 const& _subId) { return AssemblyItem(PushSubSize, _subId); }
+	AssemblyItem newPushLibraryAddress(std::string const& _identifier);
+
+	AssemblyItem append() { return append(newTag()); }
+	void append(Assembly const& _a);
+	void append(Assembly const& _a, int _deposit);
+	AssemblyItem const& append(AssemblyItem const& _i);
+	AssemblyItem const& append(std::string const& _data) { return append(newPushString(_data)); }
+	AssemblyItem const& append(bytes const& _data) { return append(newData(_data)); }
+	AssemblyItem appendSubSize(Assembly const& _a) { auto ret = newSub(_a); append(newPushSubSize(ret.data())); return ret; }
+	/// Pushes the final size of the current assembly itself. Use this when the code is modified
+	/// after compilation and CODESIZE is not an option.
+	void appendProgramSize() { append(AssemblyItem(PushProgramSize)); }
+	void appendLibraryAddress(std::string const& _identifier) { append(newPushLibraryAddress(_identifier)); }
+
+	AssemblyItem appendJump() { auto ret = append(newPushTag()); append(Instruction::JUMP); return ret; }
+	AssemblyItem appendJumpI() { auto ret = append(newPushTag()); append(Instruction::JUMPI); return ret; }
+	AssemblyItem appendJump(AssemblyItem const& _tag) { auto ret = append(_tag.pushTag()); append(Instruction::JUMP); return ret; }
+	AssemblyItem appendJumpI(AssemblyItem const& _tag) { auto ret = append(_tag.pushTag()); append(Instruction::JUMPI); return ret; }
+	AssemblyItem errorTag() { return AssemblyItem(PushTag, 0); }
+
+	template <class T> Assembly& operator<<(T const& _d) { append(_d); return *this; }
+	AssemblyItems const& items() const { return m_items; }
+	AssemblyItem const& back() const { return m_items.back(); }
+	std::string backString() const { return m_items.size() && m_items.back().type() == PushString ? m_strings.at((h256)m_items.back().data()) : std::string(); }
+
+	void onePath() { if (asserts(!m_totalDeposit && !m_baseDeposit)) BOOST_THROW_EXCEPTION(InvalidDeposit()); m_baseDeposit = m_deposit; m_totalDeposit = INT_MAX; }
+	void otherPath() { donePath(); m_totalDeposit = m_deposit; m_deposit = m_baseDeposit; }
+	void donePaths() { donePath(); m_totalDeposit = m_baseDeposit = 0; }
+	void ignored() { m_baseDeposit = m_deposit; }
+	void endIgnored() { m_deposit = m_baseDeposit; m_baseDeposit = 0; }
+
+	void popTo(int _deposit) { while (m_deposit > _deposit) append(Instruction::POP); }
+
+	void injectStart(AssemblyItem const& _i);
+	std::string out() const;
+	int deposit() const { return m_deposit; }
+	void adjustDeposit(int _adjustment) { m_deposit += _adjustment; if (asserts(m_deposit >= 0)) BOOST_THROW_EXCEPTION(InvalidDeposit()); }
+	void setDeposit(int _deposit) { m_deposit = _deposit; if (asserts(m_deposit >= 0)) BOOST_THROW_EXCEPTION(InvalidDeposit()); }
+
+	/// Changes the source location used for each appended item.
+	void setSourceLocation(SourceLocation const& _location) { m_currentSourceLocation = _location; }
+
+	/// Assembles the assembly into bytecode. The assembly should not be modified after this call.
+	LinkerObject const& assemble() const;
+	bytes const& data(h256 const& _i) const { return m_data.at(_i); }
+
+	/// Modify (if @a _enable is set) and return the current assembly such that creation and
+	/// execution gas usage is optimised. @a _isCreation should be true for the top-level assembly.
+	/// @a _runs specifes an estimate on how often each opcode in this assembly will be executed,
+	/// i.e. use a small value to optimise for size and a large value to optimise for runtime.
+	Assembly& optimise(bool _enable, bool _isCreation = true, size_t _runs = 200);
+	Json::Value stream(
+		std::ostream& _out,
+		std::string const& _prefix = "",
+		const StringMap &_sourceCodes = StringMap(),
+		bool _inJsonFormat = false
+	) const;
+
+protected:
+	std::string locationFromSources(StringMap const& _sourceCodes, SourceLocation const& _location) const;
+	void donePath() { if (m_totalDeposit != INT_MAX && m_totalDeposit != m_deposit) BOOST_THROW_EXCEPTION(InvalidDeposit()); }
+	unsigned bytesRequired() const;
+
+private:
+	Json::Value streamAsmJson(std::ostream& _out, StringMap const& _sourceCodes) const;
+	std::ostream& streamAsm(std::ostream& _out, std::string const& _prefix, StringMap const& _sourceCodes) const;
+	Json::Value createJsonValue(std::string _name, int _begin, int _end, std::string _value = std::string(), std::string _jumpType = std::string()) const;
+
+protected:
+	// 0 is reserved for exception
+	unsigned m_usedTags = 1;
+	AssemblyItems m_items;
+	std::map<h256, bytes> m_data;
+	std::vector<Assembly> m_subs;
+	std::map<h256, std::string> m_strings;
+	std::map<h256, std::string> m_libraries; ///< Identifiers of libraries to be linked.
+
+	mutable LinkerObject m_assembledObject;
+
+	int m_deposit = 0;
+	int m_baseDeposit = 0;
+	int m_totalDeposit = 0;
+
+	SourceLocation m_currentSourceLocation;
+};
+
+inline std::ostream& operator<<(std::ostream& _out, Assembly const& _a)
+{
+	_a.stream(_out);
+	return _out;
+}
+
+}
+}