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/*
This file is part of solidity.
solidity 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.
solidity 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 solidity. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libevmasm/AssemblyItem.h>
#include <libdevcore/CommonData.h>
#include <libdevcore/FixedHash.h>
#include <fstream>
using namespace std;
using namespace dev;
using namespace dev::eth;
AssemblyItem AssemblyItem::toSubAssemblyTag(size_t _subId) const
{
assertThrow(data() < (u256(1) << 64), Exception, "Tag already has subassembly set.");
assertThrow(m_type == PushTag || m_type == Tag, Exception, "");
AssemblyItem r = *this;
r.m_type = PushTag;
r.setPushTagSubIdAndTag(_subId, size_t(data()));
return r;
}
pair<size_t, size_t> AssemblyItem::splitForeignPushTag() const
{
assertThrow(m_type == PushTag || m_type == Tag, Exception, "");
return make_pair(size_t((data()) / (u256(1) << 64)) - 1, size_t(data()));
}
void AssemblyItem::setPushTagSubIdAndTag(size_t _subId, size_t _tag)
{
assertThrow(m_type == PushTag || m_type == Tag, Exception, "");
setData(_tag + (u256(_subId + 1) << 64));
}
unsigned AssemblyItem::bytesRequired(unsigned _addressLength) const
{
switch (m_type)
{
case Operation:
case Tag: // 1 byte for the JUMPDEST
return 1;
case PushString:
return 1 + 32;
case Push:
return 1 + max<unsigned>(1, dev::bytesRequired(data()));
case PushSubSize:
case PushProgramSize:
return 1 + 4; // worst case: a 16MB program
case PushTag:
case PushData:
case PushSub:
return 1 + _addressLength;
case PushLibraryAddress:
return 1 + 20;
default:
break;
}
BOOST_THROW_EXCEPTION(InvalidOpcode());
}
int AssemblyItem::arguments() const
{
if (type() == Operation)
return instructionInfo(instruction()).args;
else
return 0;
}
int AssemblyItem::returnValues() const
{
switch (m_type)
{
case Operation:
return instructionInfo(instruction()).ret;
case Push:
case PushString:
case PushTag:
case PushData:
case PushSub:
case PushSubSize:
case PushProgramSize:
case PushLibraryAddress:
return 1;
case Tag:
return 0;
default:;
}
return 0;
}
bool AssemblyItem::canBeFunctional() const
{
switch (m_type)
{
case Operation:
return !isDupInstruction(instruction()) && !isSwapInstruction(instruction());
case Push:
case PushString:
case PushTag:
case PushData:
case PushSub:
case PushSubSize:
case PushProgramSize:
case PushLibraryAddress:
return true;
case Tag:
return false;
default:;
}
return 0;
}
string AssemblyItem::getJumpTypeAsString() const
{
switch (m_jumpType)
{
case JumpType::IntoFunction:
return "[in]";
case JumpType::OutOfFunction:
return "[out]";
case JumpType::Ordinary:
default:
return "";
}
}
string AssemblyItem::toAssemblyText() const
{
string text;
switch (type())
{
case Operation:
{
assertThrow(isValidInstruction(instruction()), AssemblyException, "Invalid instruction.");
string name = instructionInfo(instruction()).name;
transform(name.begin(), name.end(), name.begin(), [](unsigned char _c) { return tolower(_c); });
text = name;
break;
}
case Push:
text = toHex(toCompactBigEndian(data(), 1), 1, HexPrefix::Add);
break;
case PushString:
text = string("data_") + toHex(data());
break;
case PushTag:
{
size_t sub{0};
size_t tag{0};
tie(sub, tag) = splitForeignPushTag();
if (sub == size_t(-1))
text = string("tag_") + to_string(tag);
else
text = string("tag_") + to_string(sub) + "_" + to_string(tag);
break;
}
case Tag:
assertThrow(data() < 0x10000, AssemblyException, "Declaration of sub-assembly tag.");
text = string("tag_") + to_string(size_t(data())) + ":";
break;
case PushData:
text = string("data_") + toHex(data());
break;
case PushSub:
text = string("dataOffset(sub_") + to_string(size_t(data())) + ")";
break;
case PushSubSize:
text = string("dataSize(sub_") + to_string(size_t(data())) + ")";
break;
case PushProgramSize:
text = string("bytecodeSize");
break;
case PushLibraryAddress:
text = string("linkerSymbol(\"") + toHex(data()) + string("\")");
break;
case UndefinedItem:
assertThrow(false, AssemblyException, "Invalid assembly item.");
break;
default:
BOOST_THROW_EXCEPTION(InvalidOpcode());
}
if (m_jumpType == JumpType::IntoFunction || m_jumpType == JumpType::OutOfFunction)
{
text += "\t//";
if (m_jumpType == JumpType::IntoFunction)
text += " in";
else
text += " out";
}
return text;
}
ostream& dev::eth::operator<<(ostream& _out, AssemblyItem const& _item)
{
switch (_item.type())
{
case Operation:
_out << " " << instructionInfo(_item.instruction()).name;
if (_item.instruction() == solidity::Instruction::JUMP || _item.instruction() == solidity::Instruction::JUMPI)
_out << "\t" << _item.getJumpTypeAsString();
break;
case Push:
_out << " PUSH " << hex << _item.data() << dec;
break;
case PushString:
_out << " PushString" << hex << (unsigned)_item.data() << dec;
break;
case PushTag:
{
size_t subId = _item.splitForeignPushTag().first;
if (subId == size_t(-1))
_out << " PushTag " << _item.splitForeignPushTag().second;
else
_out << " PushTag " << subId << ":" << _item.splitForeignPushTag().second;
break;
}
case Tag:
_out << " Tag " << _item.data();
break;
case PushData:
_out << " PushData " << hex << (unsigned)_item.data() << dec;
break;
case PushSub:
_out << " PushSub " << hex << size_t(_item.data()) << dec;
break;
case PushSubSize:
_out << " PushSubSize " << hex << size_t(_item.data()) << dec;
break;
case PushProgramSize:
_out << " PushProgramSize";
break;
case PushLibraryAddress:
{
string hash(h256((_item.data())).hex());
_out << " PushLibraryAddress " << hash.substr(0, 8) + "..." + hash.substr(hash.length() - 8);
break;
}
case UndefinedItem:
_out << " ???";
break;
default:
BOOST_THROW_EXCEPTION(InvalidOpcode());
}
return _out;
}
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