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367 lines
14 KiB
367 lines
14 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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/**
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* @author Christian <c@ethdev.com>
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* @date 2015
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* LValues for use in the expresison compiler.
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*/
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#include <libsolidity/LValue.h>
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#include <libevmcore/Instruction.h>
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#include <libsolidity/Types.h>
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#include <libsolidity/AST.h>
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#include <libsolidity/CompilerUtils.h>
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using namespace std;
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using namespace dev;
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using namespace solidity;
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StackVariable::StackVariable(CompilerContext& _compilerContext, Declaration const& _declaration):
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LValue(_compilerContext, *_declaration.getType()),
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m_baseStackOffset(m_context.getBaseStackOffsetOfVariable(_declaration)),
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m_size(m_dataType.getSizeOnStack())
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{
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}
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void StackVariable::retrieveValue(SourceLocation const& _location, bool) const
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{
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unsigned stackPos = m_context.baseToCurrentStackOffset(m_baseStackOffset);
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if (stackPos >= 15) //@todo correct this by fetching earlier or moving to memory
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BOOST_THROW_EXCEPTION(CompilerError()
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<< errinfo_sourceLocation(_location) << errinfo_comment("Stack too deep."));
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for (unsigned i = 0; i < m_size; ++i)
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m_context << eth::dupInstruction(stackPos + 1);
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}
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void StackVariable::storeValue(Type const&, SourceLocation const& _location, bool _move) const
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{
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unsigned stackDiff = m_context.baseToCurrentStackOffset(m_baseStackOffset) - m_size + 1;
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if (stackDiff > 16)
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BOOST_THROW_EXCEPTION(CompilerError()
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<< errinfo_sourceLocation(_location) << errinfo_comment("Stack too deep."));
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else if (stackDiff > 0)
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for (unsigned i = 0; i < m_size; ++i)
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m_context << eth::swapInstruction(stackDiff) << eth::Instruction::POP;
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if (!_move)
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retrieveValue(_location);
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}
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void StackVariable::setToZero(SourceLocation const& _location, bool) const
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{
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unsigned stackDiff = m_context.baseToCurrentStackOffset(m_baseStackOffset);
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if (stackDiff > 16)
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BOOST_THROW_EXCEPTION(CompilerError()
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<< errinfo_sourceLocation(_location) << errinfo_comment("Stack too deep."));
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solAssert(stackDiff >= m_size - 1, "");
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for (unsigned i = 0; i < m_size; ++i)
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m_context << u256(0) << eth::swapInstruction(stackDiff + 1 - i)
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<< eth::Instruction::POP;
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}
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StorageItem::StorageItem(CompilerContext& _compilerContext, Declaration const& _declaration):
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StorageItem(_compilerContext, *_declaration.getType())
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{
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auto const& location = m_context.getStorageLocationOfVariable(_declaration);
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m_context << location.first << u256(location.second);
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}
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StorageItem::StorageItem(CompilerContext& _compilerContext, Type const& _type):
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LValue(_compilerContext, _type)
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{
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if (m_dataType.isValueType())
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{
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solAssert(m_dataType.getStorageSize() == m_dataType.getSizeOnStack(), "");
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solAssert(m_dataType.getStorageSize() == 1, "Invalid storage size.");
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}
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}
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void StorageItem::retrieveValue(SourceLocation const&, bool _remove) const
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{
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// stack: storage_key storage_offset
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if (!m_dataType.isValueType())
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return; // no distinction between value and reference for non-value types
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if (!_remove)
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CompilerUtils(m_context).copyToStackTop(sizeOnStack(), sizeOnStack());
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if (m_dataType.getStorageBytes() == 32)
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m_context << eth::Instruction::POP << eth::Instruction::SLOAD;
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else
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{
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m_context
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<< eth::Instruction::SWAP1 << eth::Instruction::SLOAD << eth::Instruction::SWAP1
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<< u256(0x100) << eth::Instruction::EXP << eth::Instruction::SWAP1 << eth::Instruction::DIV;
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if (m_dataType.getCategory() == Type::Category::FixedBytes)
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m_context << (u256(0x1) << (256 - 8 * m_dataType.getStorageBytes())) << eth::Instruction::MUL;
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else
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m_context << ((u256(0x1) << (8 * m_dataType.getStorageBytes())) - 1) << eth::Instruction::AND;
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}
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}
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void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _location, bool _move) const
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{
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// stack: value storage_key storage_offset
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if (m_dataType.isValueType())
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{
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solAssert(m_dataType.getStorageBytes() <= 32, "Invalid storage bytes size.");
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solAssert(m_dataType.getStorageBytes() > 0, "Invalid storage bytes size.");
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if (m_dataType.getStorageBytes() == 32)
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{
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// offset should be zero
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m_context << eth::Instruction::POP;
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if (!_move)
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m_context << eth::Instruction::DUP2 << eth::Instruction::SWAP1;
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m_context << eth::Instruction::SSTORE;
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}
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else
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{
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// OR the value into the other values in the storage slot
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m_context << u256(0x100) << eth::Instruction::EXP;
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// stack: value storage_ref multiplier
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// fetch old value
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m_context << eth::Instruction::DUP2 << eth::Instruction::SLOAD;
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// stack: value storege_ref multiplier old_full_value
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// clear bytes in old value
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m_context
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<< eth::Instruction::DUP2 << ((u256(1) << (8 * m_dataType.getStorageBytes())) - 1)
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<< eth::Instruction::MUL;
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m_context << eth::Instruction::NOT << eth::Instruction::AND;
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// stack: value storage_ref multiplier cleared_value
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m_context
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<< eth::Instruction::SWAP1 << eth::Instruction::DUP4;
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// stack: value storage_ref cleared_value multiplier value
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if (m_dataType.getCategory() == Type::Category::FixedBytes)
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m_context
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<< (u256(0x1) << (256 - 8 * dynamic_cast<FixedBytesType const&>(m_dataType).getNumBytes()))
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<< eth::Instruction::SWAP1 << eth::Instruction::DIV;
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m_context << eth::Instruction::MUL << eth::Instruction::OR;
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// stack: value storage_ref updated_value
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m_context << eth::Instruction::SWAP1 << eth::Instruction::SSTORE;
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if (_move)
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m_context << eth::Instruction::POP;
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}
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}
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else
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{
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solAssert(
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_sourceType.getCategory() == m_dataType.getCategory(),
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"Wrong type conversation for assignment.");
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if (m_dataType.getCategory() == Type::Category::Array)
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{
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ArrayUtils(m_context).copyArrayToStorage(
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dynamic_cast<ArrayType const&>(m_dataType),
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dynamic_cast<ArrayType const&>(_sourceType));
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if (_move)
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CompilerUtils(m_context).popStackElement(_sourceType);
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}
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else if (m_dataType.getCategory() == Type::Category::Struct)
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{
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// stack layout: source_ref source_offset target_ref target_offset
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// note that we have structs, so offsets should be zero and are ignored
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auto const& structType = dynamic_cast<StructType const&>(m_dataType);
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solAssert(structType == _sourceType, "Struct assignment with conversion.");
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for (auto const& member: structType.getMembers())
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{
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// assign each member that is not a mapping
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TypePointer const& memberType = member.second;
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if (memberType->getCategory() == Type::Category::Mapping)
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continue;
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pair<u256, unsigned> const& offsets = structType.getStorageOffsetsOfMember(member.first);
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m_context
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<< offsets.first << u256(offsets.second)
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<< eth::Instruction::DUP6 << eth::Instruction::DUP3
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<< eth::Instruction::ADD << eth::Instruction::DUP2;
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// stack: source_ref source_off target_ref target_off member_slot_offset member_byte_offset source_member_ref source_member_off
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StorageItem(m_context, *memberType).retrieveValue(_location, true);
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// stack: source_ref source_off target_ref target_off member_offset source_value...
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solAssert(4 + memberType->getSizeOnStack() <= 16, "Stack too deep.");
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m_context
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<< eth::dupInstruction(4 + memberType->getSizeOnStack())
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<< eth::dupInstruction(3 + memberType->getSizeOnStack()) << eth::Instruction::ADD
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<< eth::dupInstruction(2 + memberType->getSizeOnStack());
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// stack: source_ref source_off target_ref target_off member_slot_offset member_byte_offset source_value... target_member_ref target_member_byte_off
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StorageItem(m_context, *memberType).storeValue(*memberType, _location, true);
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m_context << eth::Instruction::POP << eth::Instruction::POP;
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}
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if (_move)
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m_context
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<< eth::Instruction::POP << eth::Instruction::POP
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<< eth::Instruction::POP << eth::Instruction::POP;
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else
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m_context
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<< eth::Instruction::SWAP2 << eth::Instruction::POP
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<< eth::Instruction::SWAP2 << eth::Instruction::POP;
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}
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else
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BOOST_THROW_EXCEPTION(
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InternalCompilerError()
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<< errinfo_sourceLocation(_location)
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<< errinfo_comment("Invalid non-value type for assignment."));
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}
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}
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void StorageItem::setToZero(SourceLocation const&, bool _removeReference) const
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{
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if (m_dataType.getCategory() == Type::Category::Array)
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{
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if (!_removeReference)
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CompilerUtils(m_context).copyToStackTop(sizeOnStack(), sizeOnStack());
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ArrayUtils(m_context).clearArray(dynamic_cast<ArrayType const&>(m_dataType));
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}
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else if (m_dataType.getCategory() == Type::Category::Struct)
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{
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// stack layout: storage_key storage_offset
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// @todo this can be improved for packed types
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auto const& structType = dynamic_cast<StructType const&>(m_dataType);
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for (auto const& member: structType.getMembers())
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{
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// zero each member that is not a mapping
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TypePointer const& memberType = member.second;
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if (memberType->getCategory() == Type::Category::Mapping)
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continue;
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pair<u256, unsigned> const& offsets = structType.getStorageOffsetsOfMember(member.first);
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m_context
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<< offsets.first << eth::Instruction::DUP3 << eth::Instruction::ADD
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<< u256(offsets.second);
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StorageItem(m_context, *memberType).setToZero();
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}
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if (_removeReference)
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m_context << eth::Instruction::POP << eth::Instruction::POP;
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}
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else
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{
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solAssert(m_dataType.isValueType(), "Clearing of unsupported type requested: " + m_dataType.toString());
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// @todo actually use offset
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if (!_removeReference)
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CompilerUtils(m_context).copyToStackTop(sizeOnStack(), sizeOnStack());
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if (m_dataType.getStorageBytes() == 32)
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{
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// offset should be zero
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m_context
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<< eth::Instruction::POP << u256(0)
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<< eth::Instruction::SWAP1 << eth::Instruction::SSTORE;
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}
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else
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{
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m_context << u256(0x100) << eth::Instruction::EXP;
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// stack: storage_ref multiplier
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// fetch old value
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m_context << eth::Instruction::DUP2 << eth::Instruction::SLOAD;
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// stack: storege_ref multiplier old_full_value
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// clear bytes in old value
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m_context
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<< eth::Instruction::SWAP1 << ((u256(1) << (8 * m_dataType.getStorageBytes())) - 1)
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<< eth::Instruction::MUL;
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m_context << eth::Instruction::NOT << eth::Instruction::AND;
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// stack: storage_ref cleared_value
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m_context << eth::Instruction::SWAP1 << eth::Instruction::SSTORE;
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}
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}
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}
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/// Used in StorageByteArrayElement
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static FixedBytesType byteType(1);
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StorageByteArrayElement::StorageByteArrayElement(CompilerContext& _compilerContext):
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LValue(_compilerContext, byteType)
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{
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}
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void StorageByteArrayElement::retrieveValue(SourceLocation const&, bool _remove) const
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{
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// stack: ref byte_number
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if (_remove)
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m_context << eth::Instruction::SWAP1 << eth::Instruction::SLOAD
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<< eth::Instruction::SWAP1 << eth::Instruction::BYTE;
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else
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m_context << eth::Instruction::DUP2 << eth::Instruction::SLOAD
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<< eth::Instruction::DUP2 << eth::Instruction::BYTE;
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m_context << (u256(1) << (256 - 8)) << eth::Instruction::MUL;
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}
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void StorageByteArrayElement::storeValue(Type const&, SourceLocation const&, bool _move) const
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{
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//@todo optimize this
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// stack: value ref byte_number
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m_context << u256(31) << eth::Instruction::SUB << u256(0x100) << eth::Instruction::EXP;
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// stack: value ref (1<<(8*(31-byte_number)))
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m_context << eth::Instruction::DUP2 << eth::Instruction::SLOAD;
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// stack: value ref (1<<(8*(31-byte_number))) old_full_value
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// clear byte in old value
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m_context << eth::Instruction::DUP2 << u256(0xff) << eth::Instruction::MUL
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<< eth::Instruction::NOT << eth::Instruction::AND;
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// stack: value ref (1<<(32-byte_number)) old_full_value_with_cleared_byte
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m_context << eth::Instruction::SWAP1;
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m_context << (u256(1) << (256 - 8)) << eth::Instruction::DUP5 << eth::Instruction::DIV
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<< eth::Instruction::MUL << eth::Instruction::OR;
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// stack: value ref new_full_value
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m_context << eth::Instruction::SWAP1 << eth::Instruction::SSTORE;
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if (_move)
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m_context << eth::Instruction::POP;
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}
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void StorageByteArrayElement::setToZero(SourceLocation const&, bool _removeReference) const
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{
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// stack: ref byte_number
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if (!_removeReference)
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m_context << eth::Instruction::SWAP1 << eth::Instruction::DUP2;
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m_context << u256(31) << eth::Instruction::SUB << u256(0x100) << eth::Instruction::EXP;
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// stack: ref (1<<(8*(31-byte_number)))
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m_context << eth::Instruction::DUP2 << eth::Instruction::SLOAD;
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// stack: ref (1<<(8*(31-byte_number))) old_full_value
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// clear byte in old value
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m_context << eth::Instruction::SWAP1 << u256(0xff) << eth::Instruction::MUL << eth::Instruction::AND;
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// stack: ref old_full_value_with_cleared_byte
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m_context << eth::Instruction::SWAP1 << eth::Instruction::SSTORE;
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if (!_removeReference)
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m_context << eth::Instruction::SWAP1;
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else
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m_context << eth::Instruction::POP;
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}
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StorageArrayLength::StorageArrayLength(CompilerContext& _compilerContext, const ArrayType& _arrayType):
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LValue(_compilerContext, *_arrayType.getMemberType("length")),
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m_arrayType(_arrayType)
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{
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solAssert(m_arrayType.isDynamicallySized(), "");
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// storage byte offset must be zero
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m_context << eth::Instruction::POP;
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}
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void StorageArrayLength::retrieveValue(SourceLocation const&, bool _remove) const
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{
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if (!_remove)
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m_context << eth::Instruction::DUP1;
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m_context << eth::Instruction::SLOAD;
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}
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void StorageArrayLength::storeValue(Type const&, SourceLocation const&, bool _move) const
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{
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if (_move)
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m_context << eth::Instruction::SWAP1;
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else
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m_context << eth::Instruction::DUP2;
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ArrayUtils(m_context).resizeDynamicArray(m_arrayType);
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}
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void StorageArrayLength::setToZero(SourceLocation const&, bool _removeReference) const
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{
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if (!_removeReference)
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m_context << eth::Instruction::DUP1;
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ArrayUtils(m_context).clearDynamicArray(m_arrayType);
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}
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