path: root/solc/jsonCompiler.cpp

/*
    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
 * JSON interface for the solidity compiler to be used from Javascript.
 */

#include <string>
#include <functional>
#include <iostream>
#include <json/json.h>
#include <libdevcore/Common.h>
#include <libdevcore/CommonData.h>
#include <libdevcore/CommonIO.h>
#include <libevmasm/Instruction.h>
#include <libevmasm/GasMeter.h>
#include <libsolidity/parsing/Scanner.h>
#include <libsolidity/parsing/Parser.h>
#include <libsolidity/ast/ASTPrinter.h>
#include <libsolidity/analysis/NameAndTypeResolver.h>
#include <libsolidity/interface/Exceptions.h>
#include <libsolidity/interface/CompilerStack.h>
#include <libsolidity/interface/SourceReferenceFormatter.h>
#include <libsolidity/ast/ASTJsonConverter.h>
#include <libsolidity/interface/Version.h>

using namespace std;
using namespace dev;
using namespace solidity;

extern "C" {
/// Callback used to retrieve additional source files. "Returns" two pointers that should be
/// heap-allocated and are free'd by the caller.
typedef void (*CStyleReadFileCallback)(char const* _path, char** o_contents, char** o_error);
}

string formatError(
    Exception const& _exception,
    string const& _name,
    function<Scanner const&(string const&)> const& _scannerFromSourceName
)
{
    ostringstream errorOutput;
    SourceReferenceFormatter::printExceptionInformation(errorOutput, _exception, _name, _scannerFromSourceName);
    return errorOutput.str();
}

Json::Value functionHashes(ContractDefinition const& _contract)
{
    Json::Value functionHashes(Json::objectValue);
    for (auto const& it: _contract.interfaceFunctions())
        functionHashes[it.second->externalSignature()] = toHex(it.first.ref());
    return functionHashes;
}

Json::Value gasToJson(GasEstimator::GasConsumption const& _gas)
{
    if (_gas.isInfinite || _gas.value > std::numeric_limits<Json::LargestUInt>::max())
        return Json::Value(Json::nullValue);
    else
        return Json::Value(Json::LargestUInt(_gas.value));
}

Json::Value estimateGas(CompilerStack const& _compiler, string const& _contract)
{
    Json::Value gasEstimates(Json::objectValue);
    using Gas = GasEstimator::GasConsumption;
    if (!_compiler.assemblyItems(_contract) && !_compiler.runtimeAssemblyItems(_contract))
        return gasEstimates;
    if (eth::AssemblyItems const* items = _compiler.assemblyItems(_contract))
    {
        Gas gas = GasEstimator::functionalEstimation(*items);
        u256 bytecodeSize(_compiler.runtimeObject(_contract).bytecode.size());
        Json::Value creationGas(Json::arrayValue);
        creationGas[0] = gasToJson(gas);
        creationGas[1] = gasToJson(bytecodeSize * eth::GasCosts::createDataGas);
        gasEstimates["creation"] = creationGas;
    }
    if (eth::AssemblyItems const* items = _compiler.runtimeAssemblyItems(_contract))
    {
        ContractDefinition const& contract = _compiler.contractDefinition(_contract);
        Json::Value externalFunctions(Json::objectValue);
        for (auto it: contract.interfaceFunctions())
        {
            string sig = it.second->externalSignature();
            externalFunctions[sig] = gasToJson(GasEstimator::functionalEstimation(*items, sig));
        }
        if (contract.fallbackFunction())
            externalFunctions[""] = gasToJson(GasEstimator::functionalEstimation(*items, "INVALID"));
        gasEstimates["external"] = externalFunctions;
        Json::Value internalFunctions(Json::objectValue);
        for (auto const& it: contract.definedFunctions())
        {
            if (it->isPartOfExternalInterface() || it->isConstructor())
                continue;
            size_t entry = _compiler.functionEntryPoint(_contract, *it);
            GasEstimator::GasConsumption gas = GasEstimator::GasConsumption::infinite();
            if (entry > 0)
                gas = GasEstimator::functionalEstimation(*items, entry, *it);
            FunctionType type(*it);
            string sig = it->name() + "(";
            auto paramTypes = type.parameterTypes();
            for (auto it = paramTypes.begin(); it != paramTypes.end(); ++it)
                sig += (*it)->toString() + (it + 1 == paramTypes.end() ? "" : ",");
            sig += ")";
            internalFunctions[sig] = gasToJson(gas);
        }
        gasEstimates["internal"] = internalFunctions;
    }
    return gasEstimates;
}

string compile(StringMap const& _sources, bool _optimize, CStyleReadFileCallback _readCallback)
{
    Json::Value output(Json::objectValue);
    Json::Value errors(Json::arrayValue);
    CompilerStack::ReadFileCallback readCallback;
    if (_readCallback)
    {
        readCallback = [=](string const& _path) -> pair<string, string>
        {
            char* contents_c = nullptr;
            char* error_c = nullptr;
            _readCallback(_path.c_str(), &contents_c, &error_c);
            string contents;
            string error;
            if (!contents_c && !error_c)
                error = "File not found.";
            if (contents_c)
            {
                contents = string(contents_c);
                free(contents_c);
            }
            if (error_c)
            {
                error = string(error_c);
                free(error_c);
            }
            return make_pair(move(contents), move(error));
        };
    }
    CompilerStack compiler(true, readCallback);
    auto scannerFromSourceName = [&](string const& _sourceName) -> solidity::Scanner const& { return compiler.scanner(_sourceName); };
    bool success = false;
    try
    {
        compiler.addSources(_sources);
        bool succ = compiler.compile(_optimize);
        for (auto const& error: compiler.errors())
        {
            auto err = dynamic_pointer_cast<Error const>(error);
            errors.append(formatError(
                *error,
                (err->type() == Error::Type::Warning) ? "Warning" : "Error",
                scannerFromSourceName
            ));
        }
        success = succ; // keep success false on exception
    }
    catch (Error const& error)
    {
        errors.append(formatError(error, error.typeName(), scannerFromSourceName));
    }
    catch (CompilerError const& exception)
    {
        errors.append(formatError(exception, "Compiler error", scannerFromSourceName));
    }
    catch (InternalCompilerError const& exception)
    {
        errors.append(formatError(exception, "Internal compiler error", scannerFromSourceName));
    }
    catch (Exception const& exception)
    {
        errors.append("Exception during compilation: " + boost::diagnostic_information(exception));
    }
    catch (...)
    {
        errors.append("Unknown exception during compilation.");
    }

    if (errors.size() > 0)
        output["errors"] = errors;

    if (success)
    {
        output["contracts"] = Json::Value(Json::objectValue);
        for (string const& contractName: compiler.contractNames())
        {
            Json::Value contractData(Json::objectValue);
            contractData["solidity_interface"] = compiler.solidityInterface(contractName);
            contractData["interface"] = compiler.interface(contractName);
            contractData["bytecode"] = compiler.object(contractName).toHex();
            contractData["runtimeBytecode"] = compiler.runtimeObject(contractName).toHex();
            contractData["opcodes"] = solidity::disassemble(compiler.object(contractName).bytecode);
            contractData["functionHashes"] = functionHashes(compiler.contractDefinition(contractName));
            contractData["gasEstimates"] = estimateGas(compiler, contractName);
            ostringstream unused;
            contractData["assembly"] = compiler.streamAssembly(unused, contractName, _sources, true);
            output["contracts"][contractName] = contractData;
        }

        output["sources"] = Json::Value(Json::objectValue);
        for (auto const& source: _sources)
        {
            output["sources"][source.first] = Json::Value(Json::objectValue);
            output["sources"][source.first]["AST"] = ASTJsonConverter(compiler.ast(source.first)).json();
        }
    }

    return Json::FastWriter().write(output);
}

string compileMulti(string const& _input, bool _optimize, CStyleReadFileCallback _readCallback = nullptr)
{
    Json::Reader reader;
    Json::Value input;
    if (!reader.parse(_input, input, false))
    {
        Json::Value errors(Json::arrayValue);
        errors.append("Error parsing input JSON: " + reader.getFormattedErrorMessages());
        Json::Value output(Json::objectValue);
        output["errors"] = errors;
        return Json::FastWriter().write(output);
    }
    else
    {
        StringMap sources;
        Json::Value jsonSources = input["sources"];
        if (jsonSources.isObject())
            for (auto const& sourceName: jsonSources.getMemberNames())
                sources[sourceName] = jsonSources[sourceName].asString();
        return compile(sources, _optimize, _readCallback);
    }
}

string compileSingle(string const& _input, bool _optimize)
{
    StringMap sources;
    sources[""] = _input;
    return compile(sources, _optimize, nullptr);
}

static string s_outputBuffer;

extern "C"
{
extern char const* version()
{
    return VersionString.c_str();
}
extern char const* compileJSON(char const* _input, bool _optimize)
{
    s_outputBuffer = compileSingle(_input, _optimize);
    return s_outputBuffer.c_str();
}
extern char const* compileJSONMulti(char const* _input, bool _optimize)
{
    s_outputBuffer = compileMulti(_input, _optimize);
    return s_outputBuffer.c_str();
}
extern char const* compileJSONCallback(char const* _input, bool _optimize, CStyleReadFileCallback _readCallback)
{
    s_outputBuffer = compileMulti(_input, _optimize, _readCallback);
    return s_outputBuffer.c_str();
}
}