view gen/configfile.cpp @ 1650:40bd4a0d4870

Update to work with LLVM 2.7. Removed use of dyn_cast, llvm no compiles without exceptions and rtti by default. We do need exceptions for the libconfig stuff, but rtti isn't necessary (anymore). Debug info needs to be rewritten, as in LLVM 2.7 the format has completely changed. To have something to look at while rewriting, the old code has been wrapped inside #ifndef DISABLE_DEBUG_INFO , this means that you have to define this to compile at the moment. Updated tango 0.99.9 patch to include updated EH runtime code, which is needed for LLVM 2.7 as well.
author Tomas Lindquist Olsen
date Wed, 19 May 2010 12:42:32 +0200
parents ee6b20e7aedb
children
line wrap: on
line source
#include <iostream>
#include <string>
#include <cassert>
#include <cstring>

#include "llvm/System/Path.h"

#include "libconfig.h++"

#include "gen/configfile.h"

#include "mars.h"

namespace sys = llvm::sys;

ConfigFile::ConfigFile()
{
    cfg = new libconfig::Config;
}

ConfigFile::~ConfigFile()
{
    delete cfg;
}


bool ConfigFile::locate(sys::Path& p, const char* argv0, void* mainAddr, const char* filename)
{
    // temporary configuration

    // try the current working dir
    p = sys::Path::GetCurrentDirectory();
    p.appendComponent(filename);
    if (p.exists())
        return true;

    // user configuration

    // try ~/.ldc
    p = sys::Path::GetUserHomeDirectory();
    p.appendComponent(".ldc");
    p.appendComponent(filename);
    if (p.exists())
        return true;

#if _WIN32
    // try home dir
    p = sys::Path::GetUserHomeDirectory();
    p.appendComponent(filename);
    if (p.exists())
        return true;
#endif

    // system configuration

#if _WIN32
    // try the install-prefix
    p = sys::Path(LDC_INSTALL_PREFIX);
    p.appendComponent(filename);
    if (p.exists())
        return true;
#else
    // try the install-prefix/etc
    p = sys::Path(LDC_INSTALL_PREFIX);
    p.appendComponent("etc");
    p.appendComponent(filename);
    if (p.exists())
        return true;

    // try the install-prefix/etc/ldc
    p = sys::Path(LDC_INSTALL_PREFIX);
    p.appendComponent("etc");
    p.appendComponent("ldc");
    p.appendComponent(filename);
    if (p.exists())
        return true;

    // try /etc (absolute path)
    p = sys::Path("/etc");
    p.appendComponent(filename);
    if (p.exists())
        return true;

    // try /etc/ldc (absolute path)
    p = sys::Path("/etc/ldc");
    p.appendComponent(filename);
    if (p.exists())
        return true;
#endif

    // try next to the executable
    p = sys::Path::GetMainExecutable(argv0, mainAddr);
    p.eraseComponent();
    p.appendComponent(filename);
    if (p.exists())
        return true;

    return false;
}

bool ConfigFile::read(const char* argv0, void* mainAddr, const char* filename)
{
    sys::Path p;
    if (!locate(p, argv0, mainAddr, filename))
    {
        // failed to find cfg, users still have the DFLAGS environment var
        std::cerr << "Error failed to locate the configuration file: " << filename << std::endl;
        return false;
    }

    // save config file path for -v output
    pathstr = p.str();

    try
    {
        // read the cfg
        cfg->readFile(p.c_str());

        // make sure there's a default group
        if (!cfg->exists("default"))
        {
            std::cerr << "no default settings in configuration file" << std::endl;
            return false;
        }
        libconfig::Setting& root = cfg->lookup("default");
        if (!root.isGroup())
        {
            std::cerr << "default is not a group" << std::endl;
            return false;
        }

        // handle switches
        if (root.exists("switches"))
        {
            std::string binpathkey = "%%ldcbinarypath%%";

            std::string binpath = sys::Path::GetMainExecutable(argv0, mainAddr).getDirname();

            libconfig::Setting& arr = cfg->lookup("default.switches");
            int len = arr.getLength();
            for (int i=0; i<len; i++)
            {
                std::string v = arr[i];

                // replace binpathkey with binpath
                size_t p;
                while (std::string::npos != (p = v.find(binpathkey)))
                    v.replace(p, binpathkey.size(), binpath);

                switches.push_back(strdup(v.c_str()));
            }
        }

    }
    catch(libconfig::FileIOException& fioe)
    {
        std::cerr << "Error reading configuration file: " << filename << std::endl;
        return false;
    }
    catch(libconfig::ParseException& pe)
    {
        std::cerr << "Error parsing configuration file: " << filename
            << "(" << pe.getLine() << "): " << pe.getError() << std::endl;
        return false;
    }
    catch(...)
    {
        std::cerr << "Unknown exception caught!" << std::endl;
        return false;
    }

    return true;
}