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149 lines
6.8 KiB
149 lines
6.8 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file Assembly.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#pragma once
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#include <iostream>
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#include <sstream>
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#include <libdevcore/Common.h>
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#include <libevmcore/SourceLocation.h>
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#include <libevmcore/Instruction.h>
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#include "Exceptions.h"
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namespace dev
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{
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namespace eth
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{
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enum AssemblyItemType { UndefinedItem, Operation, Push, PushString, PushTag, PushSub, PushSubSize, PushProgramSize, Tag, PushData, NoOptimizeBegin, NoOptimizeEnd };
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class Assembly;
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class AssemblyItem
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{
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friend class Assembly;
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public:
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AssemblyItem(u256 _push): m_type(Push), m_data(_push) {}
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AssemblyItem(Instruction _i): m_type(Operation), m_data((byte)_i) {}
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AssemblyItem(AssemblyItemType _type, u256 _data = 0): m_type(_type), m_data(_data) {}
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AssemblyItem tag() const { if (asserts(m_type == PushTag || m_type == Tag)) BOOST_THROW_EXCEPTION(Exception()); return AssemblyItem(Tag, m_data); }
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AssemblyItem pushTag() const { if (asserts(m_type == PushTag || m_type == Tag)) BOOST_THROW_EXCEPTION(Exception()); return AssemblyItem(PushTag, m_data); }
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AssemblyItemType type() const { return m_type; }
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u256 data() const { return m_data; }
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/// @returns an upper bound for the number of bytes required by this item, assuming that
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/// the value of a jump tag takes @a _addressLength bytes.
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unsigned bytesRequired(unsigned _addressLength) const;
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int deposit() const;
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bool match(AssemblyItem const& _i) const { return _i.m_type == UndefinedItem || (m_type == _i.m_type && (m_type != Operation || m_data == _i.m_data)); }
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void setLocation(SourceLocation const& _location) { m_location = _location;}
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SourceLocation const& getLocation() const { return m_location; }
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private:
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AssemblyItemType m_type;
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u256 m_data;
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SourceLocation m_location;
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};
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using AssemblyItems = std::vector<AssemblyItem>;
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using AssemblyItemsConstRef = vector_ref<AssemblyItem const>;
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std::ostream& operator<<(std::ostream& _out, AssemblyItemsConstRef _i);
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inline std::ostream& operator<<(std::ostream& _out, AssemblyItems const& _i) { return operator<<(_out, AssemblyItemsConstRef(&_i)); }
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class Assembly
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{
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public:
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Assembly() {}
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AssemblyItem newTag() { return AssemblyItem(Tag, m_usedTags++); }
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AssemblyItem newPushTag() { return AssemblyItem(PushTag, m_usedTags++); }
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AssemblyItem newData(bytes const& _data) { h256 h = (u256)std::hash<std::string>()(asString(_data)); m_data[h] = _data; return AssemblyItem(PushData, h); }
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AssemblyItem newSub(Assembly const& _sub) { h256 h = h256::random(s_fixedHashEngine); m_subs[h] = _sub; return AssemblyItem(PushSub, h); }
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AssemblyItem newPushString(std::string const& _data) { h256 h = (u256)std::hash<std::string>()(_data); m_strings[h] = _data; return AssemblyItem(PushString, h); }
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AssemblyItem newPushSubSize(h256 const& _subId) { return AssemblyItem(PushSubSize, _subId); }
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AssemblyItem append() { return append(newTag()); }
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void append(Assembly const& _a);
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void append(Assembly const& _a, int _deposit);
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AssemblyItem const& append(AssemblyItem const& _i, SourceLocation const& _location = SourceLocation());
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AssemblyItem const& append(std::string const& _data, SourceLocation const& _location = SourceLocation()) { return append(newPushString(_data), _location); }
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AssemblyItem const& append(bytes const& _data, SourceLocation const& _location = SourceLocation()) { return append(newData(_data), _location); }
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AssemblyItem appendSubSize(Assembly const& _a) { auto ret = newSub(_a); append(newPushSubSize(ret.data())); return ret; }
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/// Pushes the final size of the current assembly itself. Use this when the code is modified
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/// after compilation and CODESIZE is not an option.
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void appendProgramSize() { append(AssemblyItem(PushProgramSize)); }
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AssemblyItem appendJump() { auto ret = append(newPushTag()); append(Instruction::JUMP); return ret; }
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AssemblyItem appendJumpI() { auto ret = append(newPushTag()); append(Instruction::JUMPI); return ret; }
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AssemblyItem appendJump(AssemblyItem const& _tag) { auto ret = append(_tag.pushTag()); append(Instruction::JUMP); return ret; }
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AssemblyItem appendJumpI(AssemblyItem const& _tag) { auto ret = append(_tag.pushTag()); append(Instruction::JUMPI); return ret; }
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template <class T> Assembly& operator<<(T const& _d) { append(_d); return *this; }
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AssemblyItems const& getItems() const { return m_items; }
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AssemblyItem const& back() const { return m_items.back(); }
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std::string backString() const { return m_items.size() && m_items.back().m_type == PushString ? m_strings.at((h256)m_items.back().m_data) : std::string(); }
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void onePath() { if (asserts(!m_totalDeposit && !m_baseDeposit)) BOOST_THROW_EXCEPTION(InvalidDeposit()); m_baseDeposit = m_deposit; m_totalDeposit = INT_MAX; }
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void otherPath() { donePath(); m_totalDeposit = m_deposit; m_deposit = m_baseDeposit; }
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void donePaths() { donePath(); m_totalDeposit = m_baseDeposit = 0; }
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void ignored() { m_baseDeposit = m_deposit; }
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void endIgnored() { m_deposit = m_baseDeposit; m_baseDeposit = 0; }
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void popTo(int _deposit) { while (m_deposit > _deposit) append(Instruction::POP); }
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void injectStart(AssemblyItem const& _i);
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std::string out() const { std::stringstream ret; streamRLP(ret); return ret.str(); }
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int deposit() const { return m_deposit; }
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void adjustDeposit(int _adjustment) { m_deposit += _adjustment; if (asserts(m_deposit >= 0)) BOOST_THROW_EXCEPTION(InvalidDeposit()); }
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void setDeposit(int _deposit) { m_deposit = _deposit; if (asserts(m_deposit >= 0)) BOOST_THROW_EXCEPTION(InvalidDeposit()); }
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bytes assemble() const;
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Assembly& optimise(bool _enable);
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std::ostream& streamRLP(std::ostream& _out, std::string const& _prefix = "", const StringMap &_sourceCodes = StringMap()) const;
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protected:
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std::string getLocationFromSources(const StringMap &_sourceCodes, const SourceLocation &_location) const;
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void donePath() { if (m_totalDeposit != INT_MAX && m_totalDeposit != m_deposit) BOOST_THROW_EXCEPTION(InvalidDeposit()); }
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unsigned bytesRequired() const;
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unsigned m_usedTags = 0;
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AssemblyItems m_items;
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mutable std::map<h256, bytes> m_data;
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std::map<h256, Assembly> m_subs;
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std::map<h256, std::string> m_strings;
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int m_deposit = 0;
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int m_baseDeposit = 0;
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int m_totalDeposit = 0;
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};
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inline std::ostream& operator<<(std::ostream& _out, Assembly const& _a)
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{
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_a.streamRLP(_out);
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return _out;
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}
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}
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}
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