solidity/libsolidity/codegen/AsmCodeGen.cpp
2018-12-04 15:31:00 +01:00

153 lines
4.0 KiB
C++

/*
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/>.
*/
/**
* Adaptor between the abstract assembly and eth assembly.
*/
#include <libsolidity/codegen/AsmCodeGen.h>
#include <libyul/AsmData.h>
#include <libyul/AsmAnalysisInfo.h>
#include <libyul/backends/evm/AbstractAssembly.h>
#include <libyul/backends/evm/EVMCodeTransform.h>
#include <libevmasm/Assembly.h>
#include <libevmasm/Instruction.h>
#include <liblangutil/SourceLocation.h>
#include <memory>
#include <functional>
using namespace std;
using namespace dev;
using namespace langutil;
using namespace yul;
using namespace dev::solidity;
class EthAssemblyAdapter: public AbstractAssembly
{
public:
explicit EthAssemblyAdapter(eth::Assembly& _assembly):
m_assembly(_assembly)
{
}
virtual void setSourceLocation(SourceLocation const& _location) override
{
m_assembly.setSourceLocation(_location);
}
virtual int stackHeight() const override { return m_assembly.deposit(); }
virtual void appendInstruction(solidity::Instruction _instruction) override
{
m_assembly.append(_instruction);
}
virtual void appendConstant(u256 const& _constant) override
{
m_assembly.append(_constant);
}
/// Append a label.
virtual void appendLabel(LabelID _labelId) override
{
m_assembly.append(eth::AssemblyItem(eth::Tag, _labelId));
}
/// Append a label reference.
virtual void appendLabelReference(LabelID _labelId) override
{
m_assembly.append(eth::AssemblyItem(eth::PushTag, _labelId));
}
virtual size_t newLabelId() override
{
return assemblyTagToIdentifier(m_assembly.newTag());
}
virtual size_t namedLabel(std::string const& _name) override
{
return assemblyTagToIdentifier(m_assembly.namedTag(_name));
}
virtual void appendLinkerSymbol(std::string const& _linkerSymbol) override
{
m_assembly.appendLibraryAddress(_linkerSymbol);
}
virtual void appendJump(int _stackDiffAfter) override
{
appendInstruction(solidity::Instruction::JUMP);
m_assembly.adjustDeposit(_stackDiffAfter);
}
virtual void appendJumpTo(LabelID _labelId, int _stackDiffAfter) override
{
appendLabelReference(_labelId);
appendJump(_stackDiffAfter);
}
virtual void appendJumpToIf(LabelID _labelId) override
{
appendLabelReference(_labelId);
appendInstruction(solidity::Instruction::JUMPI);
}
virtual void appendBeginsub(LabelID, int) override
{
// TODO we could emulate that, though
solAssert(false, "BEGINSUB not implemented for EVM 1.0");
}
/// Call a subroutine.
virtual void appendJumpsub(LabelID, int, int) override
{
// TODO we could emulate that, though
solAssert(false, "JUMPSUB not implemented for EVM 1.0");
}
/// Return from a subroutine.
virtual void appendReturnsub(int, int) override
{
// TODO we could emulate that, though
solAssert(false, "RETURNSUB not implemented for EVM 1.0");
}
virtual void appendAssemblySize() override
{
m_assembly.appendProgramSize();
}
private:
static LabelID assemblyTagToIdentifier(eth::AssemblyItem const& _tag)
{
u256 id = _tag.data();
solAssert(id <= std::numeric_limits<LabelID>::max(), "Tag id too large.");
return LabelID(id);
}
eth::Assembly& m_assembly;
};
void CodeGenerator::assemble(
Block const& _parsedData,
AsmAnalysisInfo& _analysisInfo,
eth::Assembly& _assembly,
ExternalIdentifierAccess const& _identifierAccess,
bool _useNamedLabelsForFunctions
)
{
EthAssemblyAdapter assemblyAdapter(_assembly);
CodeTransform(
assemblyAdapter,
_analysisInfo,
false,
false,
_identifierAccess,
_useNamedLabelsForFunctions
)(_parsedData);
}