mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
560 lines
19 KiB
C++
560 lines
19 KiB
C++
/*
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This file is part of solidity.
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solidity 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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solidity 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 solidity. 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 expression compiler.
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*/
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#include <libsolidity/codegen/LValue.h>
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#include <libsolidity/ast/AST.h>
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#include <libsolidity/ast/Types.h>
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#include <libsolidity/codegen/CompilerUtils.h>
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#include <libevmasm/Instruction.h>
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using namespace std;
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using namespace dev;
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using namespace langutil;
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using namespace solidity;
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StackVariable::StackVariable(CompilerContext& _compilerContext, VariableDeclaration const& _declaration):
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LValue(_compilerContext, _declaration.annotation().type.get()),
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m_baseStackOffset(m_context.baseStackOffsetOfVariable(_declaration)),
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m_size(m_dataType->sizeOnStack())
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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 + 1 > 16) //@todo correct this by fetching earlier or moving to memory
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BOOST_THROW_EXCEPTION(
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CompilerError() <<
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errinfo_sourceLocation(_location) <<
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errinfo_comment("Stack too deep, try removing local variables.")
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);
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solAssert(stackPos + 1 >= m_size, "Size and stack pos mismatch.");
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for (unsigned i = 0; i < m_size; ++i)
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m_context << 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(
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CompilerError() <<
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errinfo_sourceLocation(_location) <<
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errinfo_comment("Stack too deep, try removing local variables.")
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);
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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 << swapInstruction(stackDiff) << 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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CompilerUtils(m_context).pushZeroValue(*m_dataType);
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storeValue(*m_dataType, _location, true);
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}
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MemoryItem::MemoryItem(CompilerContext& _compilerContext, Type const& _type, bool _padded):
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LValue(_compilerContext, &_type),
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m_padded(_padded)
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{
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}
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void MemoryItem::retrieveValue(SourceLocation const&, bool _remove) const
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{
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if (m_dataType->isValueType())
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{
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if (!_remove)
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m_context << Instruction::DUP1;
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CompilerUtils(m_context).loadFromMemoryDynamic(*m_dataType, false, m_padded, false);
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}
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else
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m_context << Instruction::MLOAD;
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}
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void MemoryItem::storeValue(Type const& _sourceType, SourceLocation const&, bool _move) const
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{
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CompilerUtils utils(m_context);
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if (m_dataType->isValueType())
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{
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solAssert(_sourceType.isValueType(), "");
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utils.moveIntoStack(_sourceType.sizeOnStack());
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utils.convertType(_sourceType, *m_dataType, true);
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if (!_move)
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{
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utils.moveToStackTop(m_dataType->sizeOnStack());
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utils.copyToStackTop(1 + m_dataType->sizeOnStack(), m_dataType->sizeOnStack());
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}
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if (!m_padded)
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{
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solAssert(m_dataType->calldataEncodedSize(false) == 1, "Invalid non-padded type.");
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if (m_dataType->category() == Type::Category::FixedBytes)
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m_context << u256(0) << Instruction::BYTE;
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m_context << Instruction::SWAP1 << Instruction::MSTORE8;
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}
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else
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{
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utils.storeInMemoryDynamic(*m_dataType, m_padded);
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m_context << Instruction::POP;
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}
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}
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else
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{
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solUnimplementedAssert(_sourceType == *m_dataType, "Conversion not implemented for assignment to memory.");
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solAssert(m_dataType->sizeOnStack() == 1, "");
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if (!_move)
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m_context << Instruction::DUP2 << Instruction::SWAP1;
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// stack: [value] value lvalue
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// only store the reference
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m_context << Instruction::MSTORE;
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}
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}
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void MemoryItem::setToZero(SourceLocation const&, bool _removeReference) const
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{
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CompilerUtils utils(m_context);
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solAssert(_removeReference, "");
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utils.pushZeroValue(*m_dataType);
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utils.storeInMemoryDynamic(*m_dataType, m_padded);
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m_context << Instruction::POP;
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}
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StorageItem::StorageItem(CompilerContext& _compilerContext, VariableDeclaration const& _declaration):
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StorageItem(_compilerContext, *_declaration.annotation().type)
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{
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auto const& location = m_context.storageLocationOfVariable(_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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if (m_dataType->category() != Type::Category::Function)
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solAssert(m_dataType->storageSize() == m_dataType->sizeOnStack(), "");
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solAssert(m_dataType->storageSize() == 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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{
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solAssert(m_dataType->sizeOnStack() == 1, "Invalid storage ref size.");
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if (_remove)
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m_context << Instruction::POP; // remove byte offset
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else
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m_context << Instruction::DUP2;
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return;
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}
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if (!_remove)
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CompilerUtils(m_context).copyToStackTop(sizeOnStack(), sizeOnStack());
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if (m_dataType->storageBytes() == 32)
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m_context << Instruction::POP << Instruction::SLOAD;
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else
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{
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bool cleaned = false;
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m_context
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<< Instruction::SWAP1 << Instruction::SLOAD << Instruction::SWAP1
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<< u256(0x100) << Instruction::EXP << Instruction::SWAP1 << Instruction::DIV;
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if (m_dataType->category() == Type::Category::FixedPoint)
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// implementation should be very similar to the integer case.
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solUnimplemented("Not yet implemented - FixedPointType.");
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if (m_dataType->category() == Type::Category::FixedBytes)
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{
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CompilerUtils(m_context).leftShiftNumberOnStack(256 - 8 * m_dataType->storageBytes());
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cleaned = true;
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}
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else if (
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m_dataType->category() == Type::Category::Integer &&
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dynamic_cast<IntegerType const&>(*m_dataType).isSigned()
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)
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{
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m_context << u256(m_dataType->storageBytes() - 1) << Instruction::SIGNEXTEND;
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cleaned = true;
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}
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else if (FunctionType const* fun = dynamic_cast<decltype(fun)>(m_dataType))
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{
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if (fun->kind() == FunctionType::Kind::External)
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{
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CompilerUtils(m_context).splitExternalFunctionType(false);
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cleaned = true;
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}
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}
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if (!cleaned)
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{
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solAssert(m_dataType->sizeOnStack() == 1, "");
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m_context << ((u256(0x1) << (8 * m_dataType->storageBytes())) - 1) << Instruction::AND;
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}
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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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CompilerUtils utils(m_context);
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solAssert(m_dataType, "");
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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->storageBytes() <= 32, "Invalid storage bytes size.");
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solAssert(m_dataType->storageBytes() > 0, "Invalid storage bytes size.");
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if (m_dataType->storageBytes() == 32)
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{
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solAssert(m_dataType->sizeOnStack() == 1, "Invalid stack size.");
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// offset should be zero
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m_context << Instruction::POP;
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if (!_move)
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m_context << Instruction::DUP2 << Instruction::SWAP1;
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m_context << Instruction::SWAP1;
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utils.convertType(_sourceType, *m_dataType, true);
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m_context << Instruction::SWAP1;
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m_context << 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) << Instruction::EXP;
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// stack: value storage_ref multiplier
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// fetch old value
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m_context << Instruction::DUP2 << 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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<< Instruction::DUP2 << ((u256(1) << (8 * m_dataType->storageBytes())) - 1)
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<< Instruction::MUL;
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m_context << Instruction::NOT << Instruction::AND << Instruction::SWAP1;
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// stack: value storage_ref cleared_value multiplier
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utils.copyToStackTop(3 + m_dataType->sizeOnStack(), m_dataType->sizeOnStack());
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// stack: value storage_ref cleared_value multiplier value
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if (FunctionType const* fun = dynamic_cast<decltype(fun)>(m_dataType))
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{
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solAssert(_sourceType == *m_dataType, "function item stored but target is not equal to source");
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if (fun->kind() == FunctionType::Kind::External)
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// Combine the two-item function type into a single stack slot.
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utils.combineExternalFunctionType(false);
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else
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m_context <<
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((u256(1) << (8 * m_dataType->storageBytes())) - 1) <<
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Instruction::AND;
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}
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else if (m_dataType->category() == Type::Category::FixedBytes)
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{
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solAssert(_sourceType.category() == Type::Category::FixedBytes, "source not fixed bytes");
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CompilerUtils(m_context).rightShiftNumberOnStack(256 - 8 * dynamic_cast<FixedBytesType const&>(*m_dataType).numBytes());
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}
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else
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{
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solAssert(m_dataType->sizeOnStack() == 1, "Invalid stack size for opaque type.");
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// remove the higher order bits
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utils.convertType(_sourceType, *m_dataType, true, true);
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}
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m_context << Instruction::MUL << Instruction::OR;
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// stack: value storage_ref updated_value
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m_context << Instruction::SWAP1 << Instruction::SSTORE;
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if (_move)
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utils.popStackElement(*m_dataType);
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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.category() == m_dataType->category(),
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"Wrong type conversation for assignment.");
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if (m_dataType->category() == Type::Category::Array)
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{
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m_context << Instruction::POP; // remove byte offset
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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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);
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if (_move)
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m_context << Instruction::POP;
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}
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else if (m_dataType->category() == Type::Category::Struct)
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{
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// stack layout: source_ref target_ref target_offset
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// note that we have structs, so offset should be zero and are ignored
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m_context << Instruction::POP;
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auto const& structType = dynamic_cast<StructType const&>(*m_dataType);
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auto const& sourceType = dynamic_cast<StructType const&>(_sourceType);
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solAssert(
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structType.structDefinition() == sourceType.structDefinition(),
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"Struct assignment with conversion."
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);
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solAssert(sourceType.location() != DataLocation::CallData, "Structs in calldata not supported.");
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for (auto const& member: structType.members(nullptr))
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{
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// assign each member that is not a mapping
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TypePointer const& memberType = member.type;
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if (memberType->category() == Type::Category::Mapping)
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continue;
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TypePointer sourceMemberType = sourceType.memberType(member.name);
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if (sourceType.location() == DataLocation::Storage)
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{
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// stack layout: source_ref target_ref
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pair<u256, unsigned> const& offsets = sourceType.storageOffsetsOfMember(member.name);
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m_context << offsets.first << Instruction::DUP3 << Instruction::ADD;
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m_context << u256(offsets.second);
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// stack: source_ref target_ref source_member_ref source_member_off
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StorageItem(m_context, *sourceMemberType).retrieveValue(_location, true);
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// stack: source_ref target_ref source_value...
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}
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else
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{
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solAssert(sourceType.location() == DataLocation::Memory, "");
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// stack layout: source_ref target_ref
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TypePointer sourceMemberType = sourceType.memberType(member.name);
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m_context << sourceType.memoryOffsetOfMember(member.name);
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m_context << Instruction::DUP3 << Instruction::ADD;
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MemoryItem(m_context, *sourceMemberType).retrieveValue(_location, true);
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// stack layout: source_ref target_ref source_value...
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}
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unsigned stackSize = sourceMemberType->sizeOnStack();
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pair<u256, unsigned> const& offsets = structType.storageOffsetsOfMember(member.name);
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m_context << dupInstruction(1 + stackSize) << offsets.first << Instruction::ADD;
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m_context << u256(offsets.second);
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// stack: source_ref target_ref target_off source_value... target_member_ref target_member_byte_off
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StorageItem(m_context, *memberType).storeValue(*sourceMemberType, _location, true);
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}
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// stack layout: source_ref target_ref
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solAssert(sourceType.sizeOnStack() == 1, "Unexpected source size.");
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if (_move)
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utils.popStackSlots(2);
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else
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m_context << Instruction::SWAP1 << 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->category() == 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->category() == 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: use StorageItem for non-value types, and just store 0 in
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// all slots that contain value types later.
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auto const& structType = dynamic_cast<StructType const&>(*m_dataType);
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for (auto const& member: structType.members(nullptr))
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{
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// zero each member that is not a mapping
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TypePointer const& memberType = member.type;
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if (memberType->category() == Type::Category::Mapping)
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continue;
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pair<u256, unsigned> const& offsets = structType.storageOffsetsOfMember(member.name);
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m_context
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<< offsets.first << Instruction::DUP3 << 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 << Instruction::POP << 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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if (!_removeReference)
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CompilerUtils(m_context).copyToStackTop(sizeOnStack(), sizeOnStack());
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if (m_dataType->storageBytes() == 32)
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{
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// offset should be zero
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m_context
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<< Instruction::POP << u256(0)
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<< Instruction::SWAP1 << Instruction::SSTORE;
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}
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else
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{
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m_context << u256(0x100) << Instruction::EXP;
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// stack: storage_ref multiplier
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// fetch old value
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m_context << Instruction::DUP2 << 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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<< Instruction::SWAP1 << ((u256(1) << (8 * m_dataType->storageBytes())) - 1)
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<< Instruction::MUL;
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m_context << Instruction::NOT << Instruction::AND;
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// stack: storage_ref cleared_value
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m_context << Instruction::SWAP1 << 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 << Instruction::SWAP1 << Instruction::SLOAD
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<< Instruction::SWAP1 << Instruction::BYTE;
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else
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m_context << Instruction::DUP2 << Instruction::SLOAD
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<< Instruction::DUP2 << Instruction::BYTE;
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m_context << (u256(1) << (256 - 8)) << 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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// stack: value ref byte_number
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m_context << u256(31) << Instruction::SUB << u256(0x100) << Instruction::EXP;
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// stack: value ref (1<<(8*(31-byte_number)))
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m_context << Instruction::DUP2 << 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 << Instruction::DUP2 << u256(0xff) << Instruction::MUL
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<< Instruction::NOT << 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 << Instruction::SWAP1;
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m_context << (u256(1) << (256 - 8)) << Instruction::DUP5 << Instruction::DIV
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<< Instruction::MUL << Instruction::OR;
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// stack: value ref new_full_value
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m_context << Instruction::SWAP1 << Instruction::SSTORE;
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if (_move)
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m_context << 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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solAssert(_removeReference, "");
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m_context << u256(31) << Instruction::SUB << u256(0x100) << Instruction::EXP;
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// stack: ref (1<<(8*(31-byte_number)))
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m_context << Instruction::DUP2 << 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
|
|
m_context << Instruction::SWAP1 << u256(0xff) << Instruction::MUL;
|
|
m_context << Instruction::NOT << Instruction::AND;
|
|
// stack: ref old_full_value_with_cleared_byte
|
|
m_context << Instruction::SWAP1 << Instruction::SSTORE;
|
|
}
|
|
|
|
StorageArrayLength::StorageArrayLength(CompilerContext& _compilerContext, const ArrayType& _arrayType):
|
|
LValue(_compilerContext, _arrayType.memberType("length").get()),
|
|
m_arrayType(_arrayType)
|
|
{
|
|
solAssert(m_arrayType.isDynamicallySized(), "");
|
|
}
|
|
|
|
void StorageArrayLength::retrieveValue(SourceLocation const&, bool _remove) const
|
|
{
|
|
ArrayUtils(m_context).retrieveLength(m_arrayType);
|
|
if (_remove)
|
|
m_context << Instruction::SWAP1 << Instruction::POP;
|
|
}
|
|
|
|
void StorageArrayLength::storeValue(Type const&, SourceLocation const&, bool _move) const
|
|
{
|
|
if (_move)
|
|
m_context << Instruction::SWAP1;
|
|
else
|
|
m_context << Instruction::DUP2;
|
|
ArrayUtils(m_context).resizeDynamicArray(m_arrayType);
|
|
}
|
|
|
|
void StorageArrayLength::setToZero(SourceLocation const&, bool _removeReference) const
|
|
{
|
|
solAssert(_removeReference, "");
|
|
ArrayUtils(m_context).clearDynamicArray(m_arrayType);
|
|
}
|
|
|
|
|
|
TupleObject::TupleObject(
|
|
CompilerContext& _compilerContext,
|
|
std::vector<std::unique_ptr<LValue>>&& _lvalues
|
|
):
|
|
LValue(_compilerContext), m_lvalues(move(_lvalues))
|
|
{
|
|
}
|
|
|
|
unsigned TupleObject::sizeOnStack() const
|
|
{
|
|
unsigned size = 0;
|
|
for (auto const& lv: m_lvalues)
|
|
if (lv)
|
|
size += lv->sizeOnStack();
|
|
return size;
|
|
}
|
|
|
|
void TupleObject::retrieveValue(SourceLocation const&, bool) const
|
|
{
|
|
solAssert(false, "Tried to retrieve value of tuple.");
|
|
}
|
|
|
|
void TupleObject::storeValue(Type const& _sourceType, SourceLocation const& _location, bool) const
|
|
{
|
|
// values are below the lvalue references
|
|
unsigned valuePos = sizeOnStack();
|
|
TypePointers const& valueTypes = dynamic_cast<TupleType const&>(_sourceType).components();
|
|
solAssert(valueTypes.size() == m_lvalues.size(), "");
|
|
// valuePos .... refPos ...
|
|
// We will assign from right to left to optimize stack layout.
|
|
for (size_t i = 0; i < m_lvalues.size(); ++i)
|
|
{
|
|
unique_ptr<LValue> const& lvalue = m_lvalues[m_lvalues.size() - i - 1];
|
|
TypePointer const& valType = valueTypes[valueTypes.size() - i - 1];
|
|
unsigned stackHeight = m_context.stackHeight();
|
|
solAssert(!valType == !lvalue, "");
|
|
if (!lvalue)
|
|
continue;
|
|
valuePos += valType->sizeOnStack();
|
|
// copy value to top
|
|
CompilerUtils(m_context).copyToStackTop(valuePos, valType->sizeOnStack());
|
|
// move lvalue ref above value
|
|
CompilerUtils(m_context).moveToStackTop(valType->sizeOnStack(), lvalue->sizeOnStack());
|
|
lvalue->storeValue(*valType, _location, true);
|
|
valuePos += m_context.stackHeight() - stackHeight;
|
|
}
|
|
// As the type of an assignment to a tuple type is the empty tuple, we always move.
|
|
CompilerUtils(m_context).popStackElement(_sourceType);
|
|
}
|
|
|
|
void TupleObject::setToZero(SourceLocation const&, bool) const
|
|
{
|
|
solAssert(false, "Tried to delete tuple.");
|
|
}
|