path: root/libsolidity/inlineasm/AsmCodeGen.cpp

/*
    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/>.
*/
/**
 * @author Christian <c@ethdev.com>
 * @date 2016
 * Code-generating part of inline assembly.
 */

#include <libsolidity/inlineasm/AsmCodeGen.h>

#include <libsolidity/inlineasm/AsmParser.h>
#include <libsolidity/inlineasm/AsmData.h>
#include <libsolidity/inlineasm/AsmScope.h>
#include <libsolidity/inlineasm/AsmAnalysis.h>
#include <libsolidity/inlineasm/AsmAnalysisInfo.h>

#include <libevmasm/Assembly.h>
#include <libevmasm/SourceLocation.h>
#include <libevmasm/Instruction.h>

#include <libjulia/backends/evm/AbstractAssembly.h>
#include <libjulia/backends/evm/EVMCodeTransform.h>

#include <libdevcore/CommonIO.h>

#include <boost/range/adaptor/reversed.hpp>
#include <boost/range/adaptor/map.hpp>
#include <boost/range/algorithm/count_if.hpp>

#include <memory>
#include <functional>

using namespace std;
using namespace dev;
using namespace dev::solidity;
using namespace dev::solidity::assembly;

class EthAssemblyAdapter: public julia::AbstractAssembly
{
public:
    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 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:
    LabelID assemblyTagToIdentifier(eth::AssemblyItem const& _tag) const
    {
        u256 id = _tag.data();
        solAssert(id <= std::numeric_limits<LabelID>::max(), "Tag id too large.");
        return LabelID(id);
    }

    eth::Assembly& m_assembly;
};


void assembly::CodeGenerator::assemble(
    Block const& _parsedData,
    AsmAnalysisInfo& _analysisInfo,
    eth::Assembly& _assembly,
    julia::ExternalIdentifierAccess const& _identifierAccess
)
{
    EthAssemblyAdapter assemblyAdapter(_assembly);
    julia::CodeTransform(assemblyAdapter, _analysisInfo, false, _identifierAccess)(_parsedData);
}