mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
/*
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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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/**
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* @author Christian <c@ethdev.com>
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* @date 2014
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* Routines used by both the compiler and the expression compiler.
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*/
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#include <libsolidity/CompilerUtils.h>
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#include <libsolidity/AST.h>
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#include <libevmcore/Instruction.h>
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using namespace std;
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namespace dev
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{
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namespace solidity
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{
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const unsigned int CompilerUtils::dataStartOffset = 4;
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unsigned CompilerUtils::loadFromMemory(unsigned _offset, unsigned _bytes, bool _leftAligned,
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bool _fromCalldata, bool _padToWordBoundaries)
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{
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if (_bytes == 0)
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{
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m_context << u256(0);
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return 0;
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}
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eth::Instruction load = _fromCalldata ? eth::Instruction::CALLDATALOAD : eth::Instruction::MLOAD;
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solAssert(_bytes <= 32, "Memory load of more than 32 bytes requested.");
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if (_bytes == 32 || _padToWordBoundaries)
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{
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m_context << u256(_offset) << load;
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return 32;
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}
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else
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{
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// load data and add leading or trailing zeros by dividing/multiplying depending on alignment
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u256 shiftFactor = u256(1) << ((32 - _bytes) * 8);
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m_context << shiftFactor;
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if (_leftAligned)
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m_context << eth::Instruction::DUP1;
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m_context << u256(_offset) << load << eth::Instruction::DIV;
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if (_leftAligned)
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m_context << eth::Instruction::MUL;
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return _bytes;
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}
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}
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unsigned CompilerUtils::storeInMemory(unsigned _offset, unsigned _bytes, bool _leftAligned,
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bool _padToWordBoundaries)
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{
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if (_bytes == 0)
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{
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m_context << eth::Instruction::POP;
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return 0;
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}
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solAssert(_bytes <= 32, "Memory store of more than 32 bytes requested.");
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if (_bytes != 32 && !_leftAligned && !_padToWordBoundaries)
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// shift the value accordingly before storing
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m_context << (u256(1) << ((32 - _bytes) * 8)) << eth::Instruction::MUL;
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m_context << u256(_offset) << eth::Instruction::MSTORE;
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return _padToWordBoundaries ? 32 : _bytes;
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}
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void CompilerUtils::moveToStackVariable(VariableDeclaration const& _variable)
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{
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unsigned const stackPosition = m_context.baseToCurrentStackOffset(m_context.getBaseStackOffsetOfVariable(_variable));
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unsigned const size = _variable.getType()->getSizeOnStack();
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// move variable starting from its top end in the stack
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if (stackPosition - size + 1 > 16)
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BOOST_THROW_EXCEPTION(CompilerError() << errinfo_sourceLocation(_variable.getLocation())
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<< errinfo_comment("Stack too deep."));
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for (unsigned i = 0; i < size; ++i)
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m_context << eth::swapInstruction(stackPosition - size + 1) << eth::Instruction::POP;
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}
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void CompilerUtils::copyToStackTop(unsigned _stackDepth, Type const& _type)
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{
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if (_stackDepth > 16)
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BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Stack too deep."));
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unsigned const size = _type.getSizeOnStack();
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for (unsigned i = 0; i < size; ++i)
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m_context << eth::dupInstruction(_stackDepth);
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}
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void CompilerUtils::popStackElement(Type const& _type)
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{
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unsigned const size = _type.getSizeOnStack();
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for (unsigned i = 0; i < size; ++i)
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m_context << eth::Instruction::POP;
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}
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unsigned CompilerUtils::getSizeOnStack(vector<shared_ptr<Type const>> const& _variableTypes)
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{
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unsigned size = 0;
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for (shared_ptr<Type const> const& type: _variableTypes)
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size += type->getSizeOnStack();
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return size;
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}
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}
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}
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