path: root/libsolidity/interface/CompilerStack.h

/*
    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>
 * @author Gav Wood <g@ethdev.com>
 * @date 2014
 * Full-stack compiler that converts a source code string to bytecode.
 */

#pragma once

#include <ostream>
#include <string>
#include <memory>
#include <vector>
#include <functional>
#include <boost/noncopyable.hpp>
#include <boost/filesystem.hpp>
#include <json/json.h>
#include <libdevcore/Common.h>
#include <libdevcore/FixedHash.h>
#include <libevmasm/SourceLocation.h>
#include <libevmasm/LinkerObject.h>
#include <libsolidity/interface/ErrorReporter.h>
#include <libsolidity/interface/ReadFile.h>

namespace dev
{

namespace eth
{
class Assembly;
class AssemblyItem;
using AssemblyItems = std::vector<AssemblyItem>;
}

namespace solidity
{

// forward declarations
class Scanner;
class ASTNode;
class ContractDefinition;
class FunctionDefinition;
class SourceUnit;
class Compiler;
class GlobalContext;
class Natspec;
class Error;
class DeclarationContainer;

/**
 * Easy to use and self-contained Solidity compiler with as few header dependencies as possible.
 * It holds state and can be used to either step through the compilation stages (and abort e.g.
 * before compilation to bytecode) or run the whole compilation in one call.
 */
class CompilerStack: boost::noncopyable
{
public:
    enum State {
        Empty,
        SourcesSet,
        ParsingSuccessful,
        AnalysisSuccessful,
        CompilationSuccessful
    };

    /// Creates a new compiler stack.
    /// @param _readFile callback to used to read files for import statements. Must return
    /// and must not emit exceptions.
    explicit CompilerStack(ReadCallback::Callback const& _readFile = ReadCallback::Callback()):
        m_readFile(_readFile),
        m_errorList(),
        m_errorReporter(m_errorList) {}

    /// @returns the list of errors that occured during parsing and type checking.
    ErrorList const& errors() const { return m_errorReporter.errors(); }

    /// @returns the current state.
    State state() const { return m_stackState; }

    /// Resets the compiler to a state where the sources are not parsed or even removed.
    /// Sets the state to SourcesSet if @a _keepSources is true, otherwise to Empty.
    /// All settings, with the exception of remappings, are reset.
    void reset(bool _keepSources = false);

    /// Sets path remappings in the format "context:prefix=target"
    void setRemappings(std::vector<std::string> const& _remappings);

    /// Sets library addresses. Addresses are cleared iff @a _libraries is missing.
    /// Will not take effect before running compile.
    void setLibraries(std::map<std::string, h160> const& _libraries = std::map<std::string, h160>{})
    {
        m_libraries = _libraries;
    }

    /// Changes the optimiser settings.
    /// Will not take effect before running compile.
    void setOptimiserSettings(bool _optimize, unsigned _runs = 200)
    {
        m_optimize = _optimize;
        m_optimizeRuns = _runs;
    }

    /// Sets the list of requested contract names. If empty, no filtering is performed and every contract
    /// found in the supplied sources is compiled. Names are cleared iff @a _contractNames is missing.
    void setRequestedContractNames(std::set<std::string> const& _contractNames = std::set<std::string>{})
    {
        m_requestedContractNames = _contractNames;
    }

    /// @arg _metadataLiteralSources When true, store sources as literals in the contract metadata.
    void useMetadataLiteralSources(bool _metadataLiteralSources) { m_metadataLiteralSources = _metadataLiteralSources; }

    /// Adds a source object (e.g. file) to the parser. After this, parse has to be called again.
    /// @returns true if a source object by the name already existed and was replaced.
    bool addSource(std::string const& _name, std::string const& _content, bool _isLibrary = false);

    /// Parses all source units that were added
    /// @returns false on error.
    bool parse();

    /// Performs the analysis steps (imports, scopesetting, syntaxCheck, referenceResolving,
    ///  typechecking, staticAnalysis) on previously parsed sources.
    /// @returns false on error.
    bool analyze();

    /// Parses and analyzes all source units that were added
    /// @returns false on error.
    bool parseAndAnalyze();

    /// Compiles the source units that were previously added and parsed.
    /// @returns false on error.
    bool compile();

    /// @returns the list of sources (paths) used
    std::vector<std::string> sourceNames() const;

    /// @returns a mapping assigning each source name its index inside the vector returned
    /// by sourceNames().
    std::map<std::string, unsigned> sourceIndices() const;

    /// @returns the previously used scanner, useful for counting lines during error reporting.
    Scanner const& scanner(std::string const& _sourceName) const;

    /// @returns the parsed source unit with the supplied name.
    SourceUnit const& ast(std::string const& _sourceName) const;

    /// Helper function for logs printing. Do only use in error cases, it's quite expensive.
    /// line and columns are numbered starting from 1 with following order:
    /// start line, start column, end line, end column
    std::tuple<int, int, int, int> positionFromSourceLocation(SourceLocation const& _sourceLocation) const;

    /// @returns a list of the contract names in the sources.
    std::vector<std::string> contractNames() const;

    /// @returns the name of the last contract.
    std::string const lastContractName() const;

    /// @returns either the contract's name or a mixture of its name and source file, sanitized for filesystem use
    std::string const filesystemFriendlyName(std::string const& _contractName) const;

    /// @returns the assembled object for a contract.
    eth::LinkerObject const& object(std::string const& _contractName) const;

    /// @returns the runtime object for the contract.
    eth::LinkerObject const& runtimeObject(std::string const& _contractName) const;

    /// @returns the bytecode of a contract that uses an already deployed contract via DELEGATECALL.
    /// The returned bytes will contain a sequence of 20 bytes of the format "XXX...XXX" which have to
    /// substituted by the actual address. Note that this sequence starts end ends in three X
    /// characters but can contain anything in between.
    eth::LinkerObject const& cloneObject(std::string const& _contractName) const;

    /// @returns normal contract assembly items
    eth::AssemblyItems const* assemblyItems(std::string const& _contractName) const;

    /// @returns runtime contract assembly items
    eth::AssemblyItems const* runtimeAssemblyItems(std::string const& _contractName) const;

    /// @returns the string that provides a mapping between bytecode and sourcecode or a nullptr
    /// if the contract does not (yet) have bytecode.
    std::string const* sourceMapping(std::string const& _contractName) const;

    /// @returns the string that provides a mapping between runtime bytecode and sourcecode.
    /// if the contract does not (yet) have bytecode.
    std::string const* runtimeSourceMapping(std::string const& _contractName) const;

    /// @return a verbose text representation of the assembly.
    /// @arg _sourceCodes is the map of input files to source code strings
    /// Prerequisite: Successful compilation.
    std::string assemblyString(std::string const& _contractName, StringMap _sourceCodes = StringMap()) const;

    /// @returns a JSON representation of the assembly.
    /// @arg _sourceCodes is the map of input files to source code strings
    /// Prerequisite: Successful compilation.
    Json::Value assemblyJSON(std::string const& _contractName, StringMap _sourceCodes = StringMap()) const;

    /// @returns a JSON representing the contract ABI.
    /// Prerequisite: Successful call to parse or compile.
    Json::Value const& contractABI(std::string const& _contractName) const;

    /// @returns a JSON representing the contract's user documentation.
    /// Prerequisite: Successful call to parse or compile.
    Json::Value const& natspecUser(std::string const& _contractName) const;

    /// @returns a JSON representing the contract's developer documentation.
    /// Prerequisite: Successful call to parse or compile.
    Json::Value const& natspecDev(std::string const& _contractName) const;

    /// @returns a JSON representing a map of method identifiers (hashes) to function names.
    Json::Value methodIdentifiers(std::string const& _contractName) const;

    /// @returns the Contract Metadata
    std::string const& metadata(std::string const& _contractName) const;

    /// @returns a JSON representing the estimated gas usage for contract creation, internal and external functions
    Json::Value gasEstimates(std::string const& _contractName) const;

private:
    /**
     * Information pertaining to one source unit, filled gradually during parsing and compilation.
     */
    struct Source
    {
        std::shared_ptr<Scanner> scanner;
        std::shared_ptr<SourceUnit> ast;
        bool isLibrary = false;
        void reset() { scanner.reset(); ast.reset(); }
    };

    struct Contract
    {
        ContractDefinition const* contract = nullptr;
        std::shared_ptr<Compiler> compiler;
        eth::LinkerObject object;
        eth::LinkerObject runtimeObject;
        eth::LinkerObject cloneObject;
        std::string metadata; ///< The metadata json that will be hashed into the chain.
        mutable std::unique_ptr<Json::Value const> abi;
        mutable std::unique_ptr<Json::Value const> userDocumentation;
        mutable std::unique_ptr<Json::Value const> devDocumentation;
        mutable std::unique_ptr<std::string const> sourceMapping;
        mutable std::unique_ptr<std::string const> runtimeSourceMapping;
    };

    /// Loads the missing sources from @a _ast (named @a _path) using the callback
    /// @a m_readFile and stores the absolute paths of all imports in the AST annotations.
    /// @returns the newly loaded sources.
    StringMap loadMissingSources(SourceUnit const& _ast, std::string const& _path);
    std::string applyRemapping(std::string const& _path, std::string const& _context);
    void resolveImports();
    /// @returns the absolute path corresponding to @a _path relative to @a _reference.
    std::string absolutePath(std::string const& _path, std::string const& _reference) const;
    /// Helper function to return path converted strings.
    std::string sanitizePath(std::string const& _path) const { return boost::filesystem::path(_path).generic_string(); }

    /// @returns true if the contract is requested to be compiled.
    bool isRequestedContract(ContractDefinition const& _contract) const;

    /// Compile a single contract and put the result in @a _compiledContracts.
    void compileContract(
        ContractDefinition const& _contract,
        std::map<ContractDefinition const*, eth::Assembly const*>& _compiledContracts
    );
    void link();

    Contract const& contract(std::string const& _contractName) const;
    Source const& source(std::string const& _sourceName) const;

    /// @returns the parsed contract with the supplied name. Throws an exception if the contract
    /// does not exist.
    ContractDefinition const& contractDefinition(std::string const& _contractName) const;

    std::string createMetadata(Contract const& _contract) const;
    std::string computeSourceMapping(eth::AssemblyItems const& _items) const;
    Json::Value const& contractABI(Contract const&) const;
    Json::Value const& natspecUser(Contract const&) const;
    Json::Value const& natspecDev(Contract const&) const;

    /// @returns the offset of the entry point of the given function into the list of assembly items
    /// or zero if it is not found or does not exist.
    size_t functionEntryPoint(
        std::string const& _contractName,
        FunctionDefinition const& _function
    ) const;

    struct Remapping
    {
        std::string context;
        std::string prefix;
        std::string target;
    };

    ReadCallback::Callback m_readFile;
    ReadCallback::Callback m_smtQuery;
    bool m_optimize = false;
    unsigned m_optimizeRuns = 200;
    std::set<std::string> m_requestedContractNames;
    std::map<std::string, h160> m_libraries;
    /// list of path prefix remappings, e.g. mylibrary: github.com/ethereum = /usr/local/ethereum
    /// "context:prefix=target"
    std::vector<Remapping> m_remappings;
    std::map<std::string const, Source> m_sources;
    std::shared_ptr<GlobalContext> m_globalContext;
    std::map<ASTNode const*, std::shared_ptr<DeclarationContainer>> m_scopes;
    std::vector<Source const*> m_sourceOrder;
    std::map<std::string const, Contract> m_contracts;
    ErrorList m_errorList;
    ErrorReporter m_errorReporter;
    bool m_metadataLiteralSources = false;
    State m_stackState = Empty;
};

}
}