mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
110 lines
3.5 KiB
C++
110 lines
3.5 KiB
C++
/*
|
|
This file is part of cpp-ethereum.
|
|
|
|
cpp-ethereum is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
cpp-ethereum is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/**
|
|
* @author Christian <c@ethdev.com>
|
|
* @date 2014
|
|
* Routines used by both the compiler and the expression compiler.
|
|
*/
|
|
|
|
#include <libsolidity/CompilerUtils.h>
|
|
#include <libsolidity/AST.h>
|
|
#include <libevmcore/Instruction.h>
|
|
|
|
using namespace std;
|
|
|
|
namespace dev
|
|
{
|
|
namespace solidity
|
|
{
|
|
|
|
void CompilerUtils::loadFromMemory(unsigned _offset, unsigned _bytes, bool _leftAligned, bool _fromCalldata)
|
|
{
|
|
if (_bytes == 0)
|
|
{
|
|
m_context << u256(0);
|
|
return;
|
|
}
|
|
eth::Instruction load = _fromCalldata ? eth::Instruction::CALLDATALOAD : eth::Instruction::MLOAD;
|
|
solAssert(_bytes <= 32, "Memory load of more than 32 bytes requested.");
|
|
if (_bytes == 32)
|
|
m_context << u256(_offset) << load;
|
|
else
|
|
{
|
|
// load data and add leading or trailing zeros by dividing/multiplying depending on alignment
|
|
u256 shiftFactor = u256(1) << ((32 - _bytes) * 8);
|
|
m_context << shiftFactor;
|
|
if (_leftAligned)
|
|
m_context << eth::Instruction::DUP1;
|
|
m_context << u256(_offset) << load << eth::Instruction::DIV;
|
|
if (_leftAligned)
|
|
m_context << eth::Instruction::MUL;
|
|
}
|
|
}
|
|
|
|
void CompilerUtils::storeInMemory(unsigned _offset, unsigned _bytes, bool _leftAligned)
|
|
{
|
|
if (_bytes == 0)
|
|
{
|
|
m_context << eth::Instruction::POP;
|
|
return;
|
|
}
|
|
solAssert(_bytes <= 32, "Memory store of more than 32 bytes requested.");
|
|
if (_bytes != 32 && !_leftAligned)
|
|
// shift the value accordingly before storing
|
|
m_context << (u256(1) << ((32 - _bytes) * 8)) << eth::Instruction::MUL;
|
|
m_context << u256(_offset) << eth::Instruction::MSTORE;
|
|
}
|
|
|
|
void CompilerUtils::moveToStackVariable(VariableDeclaration const& _variable)
|
|
{
|
|
unsigned const stackPosition = m_context.baseToCurrentStackOffset(m_context.getBaseStackOffsetOfVariable(_variable));
|
|
unsigned const size = _variable.getType()->getSizeOnStack();
|
|
// move variable starting from its top end in the stack
|
|
if (stackPosition - size + 1 > 16)
|
|
BOOST_THROW_EXCEPTION(CompilerError() << errinfo_sourceLocation(_variable.getLocation())
|
|
<< errinfo_comment("Stack too deep."));
|
|
for (unsigned i = 0; i < size; ++i)
|
|
m_context << eth::swapInstruction(stackPosition - size + 1) << eth::Instruction::POP;
|
|
}
|
|
|
|
void CompilerUtils::copyToStackTop(unsigned _stackDepth, Type const& _type)
|
|
{
|
|
if (_stackDepth > 16)
|
|
BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Stack too deep."));
|
|
unsigned const size = _type.getSizeOnStack();
|
|
for (unsigned i = 0; i < size; ++i)
|
|
m_context << eth::dupInstruction(_stackDepth);
|
|
}
|
|
|
|
void CompilerUtils::popStackElement(Type const& _type)
|
|
{
|
|
unsigned const size = _type.getSizeOnStack();
|
|
for (unsigned i = 0; i < size; ++i)
|
|
m_context << eth::Instruction::POP;
|
|
}
|
|
|
|
unsigned CompilerUtils::getSizeOnStack(vector<shared_ptr<Type const>> const& _variableTypes)
|
|
{
|
|
unsigned size = 0;
|
|
for (shared_ptr<Type const> const& type: _variableTypes)
|
|
size += type->getSizeOnStack();
|
|
return size;
|
|
}
|
|
|
|
}
|
|
}
|