Poodletooth-iLand/panda/direct/showutil/FreezeTool.py

""" This module contains code to freeze a number of Python modules
into a single (mostly) standalone DLL or EXE. """

import modulefinder
import sys
import os
import marshal
import imp
import platform
import types
from distutils.sysconfig import PREFIX, get_python_inc, get_python_version

# Temporary (?) try..except to protect against unbuilt p3extend_frozen.
try:
    import p3extend_frozen
except ImportError:
    p3extend_frozen = None

import direct
from pandac.PandaModules import *
from pandac.extension_native_helpers import dll_suffix, dll_ext
import panda3d

# Check to see if we are running python_d, which implies we have a
# debug build, and we have to build the module with debug options.
# This is only relevant on Windows.

# I wonder if there's a better way to determine this?
python = os.path.splitext(os.path.split(sys.executable)[1])[0]
isDebugBuild = (python.lower().endswith('_d'))

# These are modules that Python always tries to import up-front.  They
# must be frozen in any main.exe.
startupModules = [
    'site', 'sitecustomize', 'os', 'encodings.cp1252',
    'org',
    ]

# These are missing modules that we've reported already this session.
reportedMissing = {}

# Our own Python source trees to watch out for.
sourceTrees = ['direct']

class CompilationEnvironment:
    """ Create an instance of this class to record the commands to
    invoke the compiler on a given platform.  If needed, the caller
    can create a custom instance of this class (or simply set the
    compile strings directly) to customize the build environment. """

    def __init__(self, platform):
        self.platform = platform

        # The command to compile a c to an object file.  Replace %(basename)s
        # with the basename of the source file, and an implicit .c extension.
        self.compileObj = 'error'

        # The command to link a single object file into an executable.  As
        # above, replace $(basename)s with the basename of the original source
        # file, and of the target executable.
        self.linkExe = 'error'

        # The command to link a single object file into a shared library.
        self.linkDll = 'error'

        # Paths to Python stuff.
        self.Python = None
        self.PythonIPath = get_python_inc()
        self.PythonVersion = get_python_version()

        # The VC directory of Microsoft Visual Studio (if relevant)
        self.MSVC = None
        # Directory to Windows Platform SDK (if relevant)
        self.PSDK = None

        # The setting to control release vs. debug builds.  Only relevant on
        # Windows.
        self.MD = None

        # Added to the path to the MSVC bin and lib directories on 64-bits Windows.
        self.suffix64 = ''

        # The _d extension to add to dll filenames on Windows in debug builds.
        self.dllext = ''

        # Any architecture-specific string.
        self.arch = ''

        self.determineStandardSetup()

    def determineStandardSetup(self):
        if self.platform.startswith('win'):
            self.Python = PREFIX

            if ('VCINSTALLDIR' in os.environ):
                self.MSVC = os.environ['VCINSTALLDIR']
            elif (Filename('/c/Program Files/Microsoft Visual Studio 9.0/VC').exists()):
                self.MSVC = Filename('/c/Program Files/Microsoft Visual Studio 9.0/VC').toOsSpecific()
            elif (Filename('/c/Program Files (x86)/Microsoft Visual Studio 9.0/VC').exists()):
                self.MSVC = Filename('/c/Program Files (x86)/Microsoft Visual Studio 9.0/VC').toOsSpecific()
            elif (Filename('/c/Program Files/Microsoft Visual Studio .NET 2003/Vc7').exists()):
                self.MSVC = Filename('/c/Program Files/Microsoft Visual Studio .NET 2003/Vc7').toOsSpecific()
            else:
                print 'Could not locate Microsoft Visual C++ Compiler! Try running from the Visual Studio Command Prompt.'
                sys.exit(1)

            if ('WindowsSdkDir' in os.environ):
                self.PSDK = os.environ['WindowsSdkDir']
            elif (platform.architecture()[0] == '32bit' and Filename('/c/Program Files/Microsoft Platform SDK for Windows Server 2003 R2').exists()):
                self.PSDK = Filename('/c/Program Files/Microsoft Platform SDK for Windows Server 2003 R2').toOsSpecific()
            elif (os.path.exists(os.path.join(self.MSVC, 'PlatformSDK'))):
                self.PSDK = os.path.join(self.MSVC, 'PlatformSDK')
            else:
                print 'Could not locate the Microsoft Windows Platform SDK! Try running from the Visual Studio Command Prompt.'
                sys.exit(1)

            # We need to use the correct compiler setting for debug vs. release builds.
            self.MD = '/MD'
            if isDebugBuild:
                self.MD = '/MDd'
                self.dllext = '_d'

            # MSVC/bin and /lib directories have a different location
            # for win64.
            if self.platform == 'win_amd64':
                self.suffix64 = '\\amd64'

            # If it is run by makepanda, it handles the MSVC and PlatformSDK paths itself.
            if ('MAKEPANDA' in os.environ):
                self.compileObj = 'cl /wd4996 /Fo%(basename)s.obj /nologo /c %(MD)s /Zi /O2 /Ob2 /EHsc /Zm300 /W3 /I"%(pythonIPath)s" %(filename)s'
                self.linkExe = 'link /nologo /MAP:NUL /FIXED:NO /OPT:REF /STACK:4194304 /INCREMENTAL:NO /LIBPATH:"%(python)s\libs"  /out:%(basename)s.exe %(basename)s.obj'
                self.linkDll = 'link /nologo /DLL /MAP:NUL /FIXED:NO /OPT:REF /INCREMENTAL:NO /LIBPATH:"%(python)s\libs"  /out:%(basename)s%(dllext)s.pyd %(basename)s.obj'
            else:
                os.environ['PATH'] += ';' + self.MSVC + '\\bin' + self.suffix64 + ';' + self.MSVC + '\\Common7\\IDE;' + self.PSDK + '\\bin'

                self.compileObj = 'cl /wd4996 /Fo%(basename)s.obj /nologo /c %(MD)s /Zi /O2 /Ob2 /EHsc /Zm300 /W3 /I"%(pythonIPath)s" /I"%(PSDK)s\include" /I"%(MSVC)s\include" %(filename)s'
                self.linkExe = 'link /nologo /MAP:NUL /FIXED:NO /OPT:REF /STACK:4194304 /INCREMENTAL:NO /LIBPATH:"%(PSDK)s\lib" /LIBPATH:"%(MSVC)s\\lib%(suffix64)s" /LIBPATH:"%(python)s\libs"  /out:%(basename)s.exe %(basename)s.obj'
                self.linkDll = 'link /nologo /DLL /MAP:NUL /FIXED:NO /OPT:REF /INCREMENTAL:NO /LIBPATH:"%(PSDK)s\lib" /LIBPATH:"%(MSVC)s\\lib%(suffix64)s" /LIBPATH:"%(python)s\libs"  /out:%(basename)s%(dllext)s.pyd %(basename)s.obj'

        elif self.platform.startswith('osx_'):
            # OSX
            proc = self.platform.split('_', 1)[1]
            if proc == 'i386':
                self.arch = '-arch i386'
            elif proc == 'ppc':
                self.arch = '-arch ppc'
            elif proc == 'x86_64':
                self.arch = '-arch x86_x64'
            self.compileObj = "gcc -fPIC -c %(arch)s -o %(basename)s.o -O2 -I%(pythonIPath)s %(filename)s"
            self.linkExe = "gcc %(arch)s -o %(basename)s %(basename)s.o -framework Python"
            self.linkDll = "gcc %(arch)s -undefined dynamic_lookup -bundle -o %(basename)s.so %(basename)s.o"

        else:
            # Unix
            self.compileObj = "gcc -fPIC -c -o %(basename)s.o -O2 %(filename)s -I%(pythonIPath)s"
            self.linkExe = "gcc -o %(basename)s %(basename)s.o -L/usr/local/lib -lpython%(pythonVersion)s"
            self.linkDll = "gcc -shared -o %(basename)s.so %(basename)s.o -L/usr/local/lib -lpython%(pythonVersion)s"

            if (os.path.isdir("/usr/PCBSD/local/lib")):
                self.linkExe += " -L/usr/PCBSD/local/lib"
                self.linkDll += " -L/usr/PCBSD/local/lib"

    def compileExe(self, filename, basename):
        compile = self.compileObj % {
            'python' : self.Python,
            'MSVC' : self.MSVC,
            'PSDK' : self.PSDK,
            'suffix64' : self.suffix64,
            'MD' : self.MD,
            'pythonIPath' : self.PythonIPath,
            'pythonVersion' : self.PythonVersion,
            'arch' : self.arch,
            'filename' : filename,
            'basename' : basename,
            }
        print >> sys.stderr, compile
        if os.system(compile) != 0:
            raise StandardError, 'failed to compile %s.' % basename

        link = self.linkExe % {
            'python' : self.Python,
            'MSVC' : self.MSVC,
            'PSDK' : self.PSDK,
            'suffix64' : self.suffix64,
            'pythonIPath' : self.PythonIPath,
            'pythonVersion' : self.PythonVersion,
            'arch' : self.arch,
            'filename' : filename,
            'basename' : basename,
            }
        print >> sys.stderr, link
        if os.system(link) != 0:
            raise StandardError, 'failed to link %s.' % basename

    def compileDll(self, filename, basename):
        compile = self.compileObj % {
            'python' : self.Python,
            'MSVC' : self.MSVC,
            'PSDK' : self.PSDK,
            'suffix64' : self.suffix64,
            'MD' : self.MD,
            'pythonIPath' : self.PythonIPath,
            'pythonVersion' : self.PythonVersion,
            'arch' : self.arch,
            'filename' : filename,
            'basename' : basename,
            }
        print >> sys.stderr, compile
        if os.system(compile) != 0:
            raise StandardError, 'failed to compile %s.' % basename

        link = self.linkDll % {
            'python' : self.Python,
            'MSVC' : self.MSVC,
            'PSDK' : self.PSDK,
            'suffix64' : self.suffix64,
            'pythonIPath' : self.PythonIPath,
            'pythonVersion' : self.PythonVersion,
            'arch' : self.arch,
            'filename' : filename,
            'basename' : basename,
            'dllext' : self.dllext,
            }
        print >> sys.stderr, link
        if os.system(link) != 0:
            raise StandardError, 'failed to link %s.' % basename

# The code from frozenmain.c in the Python source repository.
frozenMainCode = """
/* Python interpreter main program for frozen scripts */

#include "Python.h"

#ifdef MS_WINDOWS
extern void PyWinFreeze_ExeInit(void);
extern void PyWinFreeze_ExeTerm(void);
extern int PyInitFrozenExtensions(void);
#endif

/* Main program */

int
Py_FrozenMain(int argc, char **argv)
{
    char *p;
    int n, sts;
    int inspect = 0;
    int unbuffered = 0;

    Py_FrozenFlag = 1; /* Suppress errors from getpath.c */

    if ((p = Py_GETENV("PYTHONINSPECT")) && *p != '\\0')
        inspect = 1;
    if ((p = Py_GETENV("PYTHONUNBUFFERED")) && *p != '\\0')
        unbuffered = 1;

    if (unbuffered) {
        setbuf(stdin, (char *)NULL);
        setbuf(stdout, (char *)NULL);
        setbuf(stderr, (char *)NULL);
    }

#ifdef MS_WINDOWS
    PyInitFrozenExtensions();
#endif /* MS_WINDOWS */
    Py_SetProgramName(argv[0]);
    Py_Initialize();
#ifdef MS_WINDOWS
    PyWinFreeze_ExeInit();
#endif

    if (Py_VerboseFlag)
        fprintf(stderr, "Python %s\\n%s\\n",
            Py_GetVersion(), Py_GetCopyright());

    PySys_SetArgv(argc, argv);

    n = PyImport_ImportFrozenModule("__main__");
    if (n == 0)
        Py_FatalError("__main__ not frozen");
    if (n < 0) {
        PyErr_Print();
        sts = 1;
    }
    else
        sts = 0;

    if (inspect && isatty((int)fileno(stdin)))
        sts = PyRun_AnyFile(stdin, "<stdin>") != 0;

#ifdef MS_WINDOWS
    PyWinFreeze_ExeTerm();
#endif
    Py_Finalize();
    return sts;
}
"""

# The code from frozen_dllmain.c in the Python source repository.
# Windows only.
frozenDllMainCode = """
#include "windows.h"

static char *possibleModules[] = {
    "pywintypes",
    "pythoncom",
    "win32ui",
    NULL,
};

BOOL CallModuleDllMain(char *modName, DWORD dwReason);


/*
  Called by a frozen .EXE only, so that built-in extension
  modules are initialized correctly
*/
void PyWinFreeze_ExeInit(void)
{
    char **modName;
    for (modName = possibleModules;*modName;*modName++) {
/*      printf("Initialising '%s'\\n", *modName); */
        CallModuleDllMain(*modName, DLL_PROCESS_ATTACH);
    }
}

/*
  Called by a frozen .EXE only, so that built-in extension
  modules are cleaned up
*/
void PyWinFreeze_ExeTerm(void)
{
    // Must go backwards
    char **modName;
    for (modName = possibleModules+(sizeof(possibleModules) / sizeof(char *))-2;
         modName >= possibleModules;
         *modName--) {
/*      printf("Terminating '%s'\\n", *modName);*/
        CallModuleDllMain(*modName, DLL_PROCESS_DETACH);
    }
}

BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
    BOOL ret = TRUE;
    switch (dwReason) {
        case DLL_PROCESS_ATTACH:
        {
            char **modName;
            for (modName = possibleModules;*modName;*modName++) {
                BOOL ok = CallModuleDllMain(*modName, dwReason);
                if (!ok)
                    ret = FALSE;
            }
            break;
        }
        case DLL_PROCESS_DETACH:
        {
            // Must go backwards
            char **modName;
            for (modName = possibleModules+(sizeof(possibleModules) / sizeof(char *))-2;
                 modName >= possibleModules;
                 *modName--)
                CallModuleDllMain(*modName, DLL_PROCESS_DETACH);
            break;
        }
    }
    return ret;
}

BOOL CallModuleDllMain(char *modName, DWORD dwReason)
{
    BOOL (WINAPI * pfndllmain)(HINSTANCE, DWORD, LPVOID);

    char funcName[255];
    HMODULE hmod = GetModuleHandle(NULL);
    strcpy(funcName, "_DllMain");
    strcat(funcName, modName);
    strcat(funcName, "@12"); // stdcall convention.
    pfndllmain = (BOOL (WINAPI *)(HINSTANCE, DWORD, LPVOID))GetProcAddress(hmod, funcName);
    if (pfndllmain==NULL) {
        /* No function by that name exported - then that module does
           not appear in our frozen program - return OK
                */
        return TRUE;
    }
    return (*pfndllmain)(hmod, dwReason, NULL);
}
"""

# Our own glue code to start up a Python executable.
mainInitCode = """
%(frozenMainCode)s

int
main(int argc, char *argv[]) {
  PyImport_FrozenModules = _PyImport_FrozenModules;
  return Py_FrozenMain(argc, argv);
}
"""

# Our own glue code to start up a Python shared library.
dllInitCode = """
static PyMethodDef nullMethods[] = {
  {NULL, NULL}
};

/*
 * Call this function to extend the frozen modules array with a new
 * array of frozen modules, provided in a C-style array, at runtime.
 * Returns the total number of frozen modules.
 */
static int
extend_frozen_modules(const struct _frozen *new_modules, int new_count) {
  int orig_count;
  struct _frozen *realloc_FrozenModules;

  /* First, count the number of frozen modules we had originally. */
  orig_count = 0;
  while (PyImport_FrozenModules[orig_count].name != NULL) {
    ++orig_count;
  }

  if (new_count == 0) {
    /* Trivial no-op. */
    return orig_count;
  }

  /* Reallocate the PyImport_FrozenModules array bigger to make room
     for the additional frozen modules.  We just leak the original
     array; it's too risky to try to free it. */
  realloc_FrozenModules = (struct _frozen *)malloc((orig_count + new_count + 1) * sizeof(struct _frozen));

  /* The new frozen modules go at the front of the list. */
  memcpy(realloc_FrozenModules, new_modules, new_count * sizeof(struct _frozen));

  /* Then the original set of frozen modules. */
  memcpy(realloc_FrozenModules + new_count, PyImport_FrozenModules, orig_count * sizeof(struct _frozen));

  /* Finally, a single 0-valued entry marks the end of the array. */
  memset(realloc_FrozenModules + orig_count + new_count, 0, sizeof(struct _frozen));

  /* Assign the new pointer. */
  PyImport_FrozenModules = realloc_FrozenModules;

  return orig_count + new_count;
}

%(dllexport)svoid init%(moduleName)s() {
  extend_frozen_modules(_PyImport_FrozenModules, %(newcount)s);
  Py_InitModule("%(moduleName)s", nullMethods);
}
"""

programFile = """
#include "Python.h"
#ifdef _WIN32
#include "malloc.h"
#endif

%(moduleDefs)s

static struct _frozen _PyImport_FrozenModules[] = {
%(moduleList)s
  {NULL, NULL, 0}
};

%(initCode)s
"""

# Windows needs this bit.
frozenExtensions = """

static struct _inittab extensions[] = {
        /* Sentinel */
        {0, 0}
};
extern DL_IMPORT(int) PyImport_ExtendInittab(struct _inittab *newtab);

int PyInitFrozenExtensions()
{
        return PyImport_ExtendInittab(extensions);
}
"""

okMissing = [
    'Carbon.Folder', 'Carbon.Folders', 'HouseGlobals', 'Carbon.File',
    'MacOS', '_emx_link', 'ce', 'mac', 'org.python.core', 'os.path',
    'os2', 'posix', 'pwd', 'readline', 'riscos', 'riscosenviron',
    'riscospath', 'dbm', 'fcntl', 'win32api',
    '_winreg', 'ctypes', 'ctypes.wintypes', 'nt','msvcrt',
    'EasyDialogs', 'SOCKS', 'ic', 'rourl2path', 'termios',
    'OverrideFrom23._Res', 'email', 'email.Utils', 'email.Generator',
    'email.Iterators', '_subprocess', 'gestalt',
    'direct.extensions_native.extensions_darwin',
    ]

class Freezer:
    class ModuleDef:
        def __init__(self, moduleName, filename = None,
                     implicit = False, guess = False,
                     exclude = False, forbid = False,
                     allowChildren = False, fromSource = None):
            # The Python module name.
            self.moduleName = moduleName

            # The file on disk it was loaded from, if any.
            self.filename = filename
            if isinstance(filename, types.StringTypes):
                self.filename = Filename(filename)

            # True if the module was found via the modulefinder.
            self.implicit = implicit

            # True if the moduleName might refer to some Python object
            # other than a module, in which case the module should be
            # ignored.
            self.guess = guess

            # True if the module should *not* be included in the
            # generated output.
            self.exclude = exclude

            # True if the module should never be allowed, even if it
            # exists at runtime.
            self.forbid = forbid

            # True if excluding the module still allows its children
            # to be included.  This only makes sense if the module
            # will exist at runtime through some other means
            # (e.g. from another package).
            self.allowChildren = allowChildren

            # Additional black-box information about where this module
            # record came from, supplied by the caller.
            self.fromSource = fromSource

            # Some sanity checks.
            if not self.exclude:
                self.allowChildren = True

            if self.forbid:
                self.exclude = True
                self.allowChildren = False

        def __repr__(self):
            args = [repr(self.moduleName), repr(self.filename)]
            if self.implicit:
                args.append('implicit = True')
            if self.guess:
                args.append('guess = True')
            if self.exclude:
                args.append('exclude = True')
            if self.forbid:
                args.append('forbid = True')
            if self.allowChildren:
                args.append('allowChildren = True')
            return 'ModuleDef(%s)' % (', '.join(args))

    def __init__(self, previous = None, debugLevel = 0,
                 platform = None):
        # Normally, we are freezing for our own platform.  Change this
        # if untrue.
        self.platform = platform or PandaSystem.getPlatform()

        # This is the compilation environment.  Fill in your own
        # object here if you have custom needs (for instance, for a
        # cross-compiler or something).  If this is None, then a
        # default object will be created when it is needed.
        self.cenv = None

        # The filename extension to append to the source file before
        # compiling.
        self.sourceExtension = '.c'

        # The filename extension to append to the object file.
        self.objectExtension = '.o'
        if self.platform.startswith('win'):
            self.objectExtension = '.obj'

        # Change any of these to change the generated startup and glue
        # code.
        self.frozenMainCode = frozenMainCode
        self.frozenDllMainCode = frozenDllMainCode
        self.mainInitCode = mainInitCode
        self.frozenExtensions = frozenExtensions

        # Set this true to encode Python files in a Multifile as their
        # original source if possible, or false to encode them as
        # compiled pyc or pyo files.  This has no effect on frozen exe
        # or dll's; those are always stored with compiled code.
        self.storePythonSource = False

        # This list will be filled in by generateCode() or
        # addToMultifile().  It contains a list of all the extension
        # modules that were discovered, which have not been added to
        # the output.  The list is a list of tuples of the form
        # (moduleName, filename).
        self.extras = []

        # End of public interface.  These remaining members should not
        # be directly manipulated by callers.
        self.previousModules = {}
        self.modules = {}

        if previous:
            self.previousModules = dict(previous.modules)
            self.modules = dict(previous.modules)

        self.mf = None

        # Make sure we know how to find "direct".
        for sourceTree in sourceTrees:
            try:
                module = __import__(sourceTree)
            except:
                pass

        # Actually, make sure we know how to find all of the
        # already-imported modules.  (Some of them might do their own
        # special path mangling.)
        for moduleName, module in sys.modules.items():
            if module and hasattr(module, '__path__'):
                path = getattr(module, '__path__')
                modulefinder.AddPackagePath(moduleName, path[0])

    def excludeFrom(self, freezer):
        """ Excludes all modules that have already been processed by
        the indicated FreezeTool.  This is equivalent to passing the
        indicated FreezeTool object as previous to this object's
        constructor, but it may be called at any point during
        processing. """

        for key, value in freezer.modules.items():
            self.previousModules[key] = value
            self.modules[key] = value

    def excludeModule(self, moduleName, forbid = False, allowChildren = False,
                      fromSource = None):
        """ Adds a module to the list of modules not to be exported by
        this tool.  If forbid is true, the module is furthermore
        forbidden to be imported, even if it exists on disk.  If
        allowChildren is true, the children of the indicated module
        may still be included."""

        assert self.mf == None

        self.modules[moduleName] = self.ModuleDef(
            moduleName, exclude = True,
            forbid = forbid, allowChildren = allowChildren,
            fromSource = fromSource)

    def handleCustomPath(self, moduleName):
        """ Indicates a module that may perform runtime manipulation
        of its __path__ variable, and which must therefore be actually
        imported at runtime in order to determine the true value of
        __path__. """

        str = 'import %s' % (moduleName)
        exec(str)

        module = sys.modules[moduleName]
        for path in module.__path__:
            modulefinder.AddPackagePath(moduleName, path)

    def getModulePath(self, moduleName):
        """ Looks for the indicated directory module and returns the
        __path__ member: the list of directories in which its python
        files can be found.  If the module is a .py file and not a
        directory, returns None. """

        # First, try to import the module directly.  That's the most
        # reliable answer, if it works.
        try:
            module = __import__(moduleName)
        except:
            print "couldn't import %s" % (moduleName)
            module = None

        if module != None:
            for symbol in moduleName.split('.')[1:]:
                module = getattr(module, symbol)
            if hasattr(module, '__path__'):
                return module.__path__

        # If it didn't work--maybe the module is unimportable because
        # it makes certain assumptions about the builtins, or
        # whatever--then just look for file on disk.  That's usually
        # good enough.
        path = None
        baseName = moduleName
        if '.' in baseName:
            parentName, baseName = moduleName.rsplit('.', 1)
            path = self.getModulePath(parentName)
            if path == None:
                return None

        try:
            file, pathname, description = imp.find_module(baseName, path)
        except ImportError:
            return None

        if not os.path.isdir(pathname):
            return None
        return [pathname]

    def getModuleStar(self, moduleName):
        """ Looks for the indicated directory module and returns the
        __all__ member: the list of symbols within the module. """

        # First, try to import the module directly.  That's the most
        # reliable answer, if it works.
        try:
            module = __import__(moduleName)
        except:
            print "couldn't import %s" % (moduleName)
            module = None

        if module != None:
            for symbol in moduleName.split('.')[1:]:
                module = getattr(module, symbol)
            if hasattr(module, '__all__'):
                return module.__all__

        # If it didn't work, just open the directory and scan for *.py
        # files.
        path = None
        baseName = moduleName
        if '.' in baseName:
            parentName, baseName = moduleName.rsplit('.', 1)
            path = self.getModulePath(parentName)
            if path == None:
                return None

        try:
            file, pathname, description = imp.find_module(baseName, path)
        except ImportError:
            return None

        if not os.path.isdir(pathname):
            return None

        # Scan the directory, looking for .py files.
        modules = []
        for basename in os.listdir(pathname):
            if basename.endswith('.py') and basename != '__init__.py':
                modules.append(basename[:-3])

        return modules

    def addModule(self, moduleName, implicit = False, newName = None,
                  filename = None, guess = False, fromSource = None):
        """ Adds a module to the list of modules to be exported by
        this tool.  If implicit is true, it is OK if the module does
        not actually exist.

        newName is the name to call the module when it appears in the
        output.  The default is the same name it had in the original.
        Use caution when renaming a module; if another module imports
        this module by its original name, you will also need to
        explicitly add the module under its original name, duplicating
        the module twice in the output.

        The module name may end in ".*", which means to add all of the
        .py files (other than __init__.py) in a particular directory.
        It may also end in ".*.*", which means to cycle through all
        directories within a particular directory.
        """

        assert self.mf == None

        if not newName:
            newName = moduleName

        if moduleName.endswith('.*'):
            assert(newName.endswith('.*'))
            # Find the parent module, so we can get its directory.
            parentName = moduleName[:-2]
            newParentName = newName[:-2]
            parentNames = [(parentName, newParentName)]

            if parentName.endswith('.*'):
                assert(newParentName.endswith('.*'))
                # Another special case.  The parent name "*" means to
                # return all possible directories within a particular
                # directory.

                topName = parentName[:-2]
                newTopName = newParentName[:-2]
                parentNames = []
                modulePath = self.getModulePath(topName)
                if modulePath:
                    for dirname in modulePath:
                        for basename in os.listdir(dirname):
                            if os.path.exists(os.path.join(dirname, basename, '__init__.py')):
                                parentName = '%s.%s' % (topName, basename)
                                newParentName = '%s.%s' % (newTopName, basename)
                                if self.getModulePath(parentName):
                                    parentNames.append((parentName, newParentName))

            for parentName, newParentName in parentNames:
                modules = self.getModuleStar(parentName)

                if modules == None:
                    # It's actually a regular module.
                    self.modules[newParentName] = self.ModuleDef(
                        parentName, implicit = implicit, guess = guess,
                        fromSource = fromSource)

                else:
                    # Now get all the py files in the parent directory.
                    for basename in modules:
                        moduleName = '%s.%s' % (parentName, basename)
                        newName = '%s.%s' % (newParentName, basename)
                        mdef = self.ModuleDef(
                            moduleName, implicit = implicit, guess = True,
                            fromSource = fromSource)
                        self.modules[newName] = mdef
        else:
            # A normal, explicit module name.
            self.modules[newName] = self.ModuleDef(
                moduleName, filename = filename, implicit = implicit,
                guess = guess, fromSource = fromSource)

    def done(self, compileToExe = False):
        """ Call this method after you have added all modules with
        addModule().  You may then call generateCode() or
        writeMultifile() to dump the resulting output.  After a call
        to done(), you may not add any more modules until you call
        reset(). """

        assert self.mf == None

        # If we are building an exe, we also need to implicitly
        # bring in Python's startup modules.
        if compileToExe:
            for moduleName in startupModules:
                if moduleName not in self.modules:
                    self.modules[moduleName] = self.ModuleDef(moduleName, implicit = True)

        # Excluding a parent module also excludes all its
        # (non-explicit) children, unless the parent has allowChildren
        # set.

        # Walk through the list in sorted order, so we reach parents
        # before children.
        names = self.modules.items()
        names.sort()

        excludeDict = {}
        implicitParentDict = {}
        includes = []
        autoIncludes = []
        origToNewName = {}
        for newName, mdef in names:
            moduleName = mdef.moduleName
            origToNewName[moduleName] = newName
            if mdef.implicit and '.' in newName:
                # For implicit modules, check if the parent is excluded.
                parentName, baseName = newName.rsplit('.', 1)
                if parentName in excludeDict :
                    mdef = excludeDict[parentName]

            if mdef.exclude:
                if not mdef.allowChildren:
                    excludeDict[moduleName] = mdef
            elif mdef.implicit or mdef.guess:
                autoIncludes.append(mdef)
            else:
                includes.append(mdef)

        self.mf = PandaModuleFinder(excludes = excludeDict.keys())

        # Attempt to import the explicit modules into the modulefinder.

        # First, ensure the includes are sorted in order so that
        # packages appear before the modules they contain.  This
        # resolves potential ordering issues, especially with modules
        # that are discovered by filename rather than through import
        # statements.
        includes.sort(key = self.__sortModuleKey)

        # Now walk through the list and import them all.
        for mdef in includes:
            try:
                self.__loadModule(mdef)
            except ImportError:
                print "Unknown module: %s" % (mdef.moduleName)

        # Also attempt to import any implicit modules.  If any of
        # these fail to import, we don't really care.
        for mdef in autoIncludes:
            try:
                self.__loadModule(mdef)
                # Since it successfully loaded, it's no longer a guess.
                mdef.guess = False
            except:
                # Something went wrong, guess it's not an importable
                # module.
                pass

        # Now, any new modules we found get added to the export list.
        for origName in self.mf.modules.keys():
            if origName not in origToNewName:
                self.modules[origName] = self.ModuleDef(origName, implicit = True)

        missing = []
        for origName in self.mf.any_missing_maybe()[0]:
            if origName in startupModules:
                continue
            if origName in self.previousModules:
                continue
            if origName in self.modules:
                continue
                
            # This module is missing.  Let it be missing in the
            # runtime also.
            self.modules[origName] = self.ModuleDef(origName, exclude = True,
                                                    implicit = True)

            if origName in okMissing:
                # If it's listed in okMissing, don't even report it.
                continue

            prefix = origName.split('.')[0]
            if origName not in reportedMissing:
                missing.append(origName)
                reportedMissing[origName] = True

        if missing:
            missing.sort()
            print "There are some missing modules: %r" % missing

    def __sortModuleKey(self, mdef):
        """ A sort key function to sort a list of mdef's into order,
        primarily to ensure that packages proceed their modules. """

        if mdef.moduleName:
            # If we have a moduleName, the key consists of the split
            # tuple of packages names.  That way, parents always sort
            # before children.
            return ('a', mdef.moduleName.split('.'))
        else:
            # If we don't have a moduleName, the key doesn't really
            # matter--we use filename--but we start with 'b' to ensure
            # that all of non-named modules appear following all of
            # the named modules.
            return ('b', mdef.filename)

    def __loadModule(self, mdef):
        """ Adds the indicated module to the modulefinder. """

        if mdef.filename:
            # If it has a filename, then we found it as a file on
            # disk.  In this case, the moduleName may not be accurate
            # and useful, so load it as a file instead.

            tempPath = None
            if '.' not in mdef.moduleName:
                # If we loaded a python file from the root, we need to
                # temporarily add its directory to the module search
                # path, so the modulefinder can find any sibling
                # python files it imports as well.
                tempPath = Filename(mdef.filename.getDirname()).toOsSpecific()
                self.mf.path.append(tempPath)

            pathname = mdef.filename.toOsSpecific()
            ext = mdef.filename.getExtension()
            if ext == 'pyc' or ext == 'pyo':
                fp = open(pathname, 'rb')
                stuff = ("", "rb", imp.PY_COMPILED)
                self.mf.load_module(mdef.moduleName, fp, pathname, stuff)
            else:
                fp = open(pathname, modulefinder.READ_MODE)
                stuff = ("", "r", imp.PY_SOURCE)
                self.mf.load_module(mdef.moduleName, fp, pathname, stuff)

            if tempPath:
                del self.mf.path[-1]

        else:
            # Otherwise, we can just import it normally.
            self.mf.import_hook(mdef.moduleName)

    def reset(self):
        """ After a previous call to done(), this resets the
        FreezeTool object for a new pass.  More modules may be added
        and dumped to a new target.  Previously-added modules are
        remembered and will not be dumped again. """

        self.mf = None
        self.previousModules = dict(self.modules)

    def mangleName(self, moduleName):
        return 'M_' + moduleName.replace('.', '__').replace('-', '_')

    def getAllModuleNames(self):
        """ Return a list of all module names that have been included
        or forbidden, either in this current pass or in a previous
        pass.  Module names that have been excluded are not included
        in this list. """

        moduleNames = []

        for newName, mdef in self.modules.items():
            if mdef.guess:
                # Not really a module.
                pass
            elif mdef.exclude and not mdef.forbid:
                # An excluded (but not forbidden) file.
                pass
            else:
                moduleNames.append(newName)

        moduleNames.sort()
        return moduleNames

    def getModuleDefs(self):
        """ Return a list of all of the modules we will be explicitly
        or implicitly including.  The return value is actually a list
        of tuples: (moduleName, moduleDef)."""

        moduleDefs = []

        for newName, mdef in self.modules.items():
            prev = self.previousModules.get(newName, None)
            if not mdef.exclude:
                # Include this module (even if a previous pass
                # excluded it).  But don't bother if we exported it
                # previously.
                if prev and not prev.exclude:
                    # Previously exported.
                    pass
                elif mdef.moduleName in self.mf.modules or \
                     mdef.moduleName in startupModules or \
                     mdef.filename:
                    moduleDefs.append((newName, mdef))
            elif mdef.forbid:
                if not prev or not prev.forbid:
                    moduleDefs.append((newName, mdef))

        moduleDefs.sort()
        return moduleDefs

    def __replacePaths(self):
        # Build up the replacement pathname table, so we can eliminate
        # the personal information in the frozen pathnames.  The
        # actual filename we put in there is meaningful only for stack
        # traces, so we'll just use the module name.
        replace_paths = []
        for moduleName, module in self.mf.modules.items():
            if module.__code__:
                origPathname = module.__code__.co_filename
                replace_paths.append((origPathname, moduleName))
        self.mf.replace_paths = replace_paths

        # Now that we have built up the replacement mapping, go back
        # through and actually replace the paths.
        for moduleName, module in self.mf.modules.items():
            if module.__code__:
                co = self.mf.replace_paths_in_code(module.__code__)
                module.__code__ = co;

    def __addPyc(self, multifile, filename, code, compressionLevel):
        if code:
            data = imp.get_magic() + '\0\0\0\0' + \
                   marshal.dumps(code)

            stream = StringStream(data)
            multifile.addSubfile(filename, stream, compressionLevel)
            multifile.flush()

    def __addPythonDirs(self, multifile, moduleDirs, dirnames, compressionLevel):
        """ Adds all of the names on dirnames as a module directory. """
        if not dirnames:
            return

        str = '.'.join(dirnames)
        if str not in moduleDirs:
            # Add an implicit __init__.py file (but only if there's
            # not already a legitimate __init__.py file).
            moduleName = '.'.join(dirnames)
            filename = '/'.join(dirnames) + '/__init__'

            if self.storePythonSource:
                filename += '.py'
                stream = StringStream('')
                if multifile.findSubfile(filename) < 0:
                    multifile.addSubfile(filename, stream, 0)
                    multifile.flush()
            else:
                if __debug__:
                    filename += '.pyc'
                else:
                    filename += '.pyo'
                if multifile.findSubfile(filename) < 0:
                    code = compile('', moduleName, 'exec')
                    self.__addPyc(multifile, filename, code, compressionLevel)

            moduleDirs[str] = True
            self.__addPythonDirs(multifile, moduleDirs, dirnames[:-1], compressionLevel)

    def __addPythonFile(self, multifile, moduleDirs, moduleName, mdef,
                        compressionLevel):
        """ Adds the named module to the multifile as a .pyc file. """

        # First, split the module into its subdirectory names.
        dirnames = moduleName.split('.')
        if len(dirnames) > 1 and dirnames[-1] == '__init__':
            # The "module" may end in __init__, but that really means
            # the parent directory.
            dirnames = dirnames[:-1]
            
        self.__addPythonDirs(multifile, moduleDirs, dirnames[:-1], compressionLevel)

        filename = '/'.join(dirnames)

        module = self.mf.modules.get(mdef.moduleName, None)
        if getattr(module, '__path__', None) is not None or \
          (getattr(module, '__file__', None) is not None and getattr(module, '__file__').endswith('/__init__.py')):
            # It's actually a package.  In this case, we really write
            # the file moduleName/__init__.py.
            filename += '/__init__'
            moduleDirs[moduleName] = True

            # Ensure we don't have an implicit filename from above.
            multifile.removeSubfile(filename + '.py')
            if __debug__:
                multifile.removeSubfile(filename + '.pyc')
            else:
                multifile.removeSubfile(filename + '.pyo')

        # Attempt to add the original source file if we can.
        sourceFilename = None
        if mdef.filename and mdef.filename.getExtension() == "py":
            sourceFilename = mdef.filename
        elif getattr(module, '__file__', None):
            sourceFilename = Filename.fromOsSpecific(module.__file__)
            sourceFilename.setExtension("py")

        if self.storePythonSource:
            if sourceFilename and sourceFilename.exists():
                filename += '.py'
                multifile.addSubfile(filename, sourceFilename, compressionLevel)
                return

        # If we can't find the source file, add the compiled pyc instead.
        if __debug__:
            filename += '.pyc'
        else:
            filename += '.pyo'

        code = None
        if module:
            # Get the compiled code directly from the module object.
            code = getattr(module, "__code__", None)
            if not code:
                # This is a module with no associated Python
                # code.  It must be an extension module.  Get the
                # filename.
                extensionFilename = getattr(module, '__file__', None)
                if extensionFilename:
                    self.extras.append((moduleName, extensionFilename))
                else:
                    # It doesn't even have a filename; it must
                    # be a built-in module.  No worries about
                    # this one, then.
                    pass

        else:
            # Read the code from the source file and compile it on-the-fly.
            if sourceFilename and sourceFilename.exists():
                source = open(sourceFilename.toOsSpecific(), 'r').read()
                if source and source[-1] != '\n':
                    source = source + '\n'
                code = compile(source, sourceFilename.cStr(), 'exec')

        self.__addPyc(multifile, filename, code, compressionLevel)

    def addToMultifile(self, multifile, compressionLevel = 0):
        """ After a call to done(), this stores all of the accumulated
        python code into the indicated Multifile.  Additional
        extension modules are listed in self.extras.  """

        moduleDirs = {}
        for moduleName, mdef in self.getModuleDefs():
            if not mdef.exclude:
                self.__addPythonFile(multifile, moduleDirs, moduleName, mdef,
                                     compressionLevel)

    def writeMultifile(self, mfname):
        """ After a call to done(), this stores all of the accumulated
        python code into a Multifile with the indicated filename,
        including the extension.  Additional extension modules are
        listed in self.extras."""

        self.__replacePaths()

        Filename(mfname).unlink()
        multifile = Multifile()
        if not multifile.openReadWrite(mfname):
            raise StandardError

        self.addToMultifile(multifile)

        multifile.flush()
        multifile.repack()

    def generateCode(self, basename, compileToExe = False):
        """ After a call to done(), this freezes all of the
        accumulated python code into either an executable program (if
        compileToExe is true) or a dynamic library (if compileToExe is
        false).  The basename is the name of the file to write,
        without the extension.

        The return value is the newly-generated filename, including
        the filename extension.  Additional extension modules are
        listed in self.extras. """

        if compileToExe:
            # We must have a __main__ module to make an exe file.
            if not self.__writingModule('__main__'):
                message = "Can't generate an executable without a __main__ module."
                raise StandardError, message

        self.__replacePaths()

        # Now generate the actual export table.
        moduleDefs = []
        moduleList = []

        for moduleName, mdef in self.getModuleDefs():
            origName = mdef.moduleName
            if mdef.forbid:
                # Explicitly disallow importing this module.
                moduleList.append(self.makeForbiddenModuleListEntry(moduleName))
            else:
                assert not mdef.exclude
                # Allow importing this module.
                module = self.mf.modules.get(origName, None)
                code = getattr(module, "__code__", None)
                if not code and moduleName in startupModules:
                    # Forbid the loading of this startup module.
                    moduleList.append(self.makeForbiddenModuleListEntry(moduleName))
                else:
                    if origName in sourceTrees:
                        # This is one of Panda3D's own Python source
                        # trees.  These are a special case: we don't
                        # compile the __init__.py files within them,
                        # since their only purpose is to munge the
                        # __path__ variable anyway.  Instead, we
                        # pretend the __init__.py files are empty.
                        code = compile('', moduleName, 'exec')

                    if code:
                        code = marshal.dumps(code)

                        mangledName = self.mangleName(moduleName)
                        moduleDefs.append(self.makeModuleDef(mangledName, code))
                        moduleList.append(self.makeModuleListEntry(mangledName, code, moduleName, module))
                    else:

                        # This is a module with no associated Python
                        # code.  It must be an extension module.  Get the
                        # filename.
                        extensionFilename = getattr(module, '__file__', None)
                        if extensionFilename:
                            self.extras.append((moduleName, extensionFilename))
                        else:
                            # It doesn't even have a filename; it must
                            # be a built-in module.  No worries about
                            # this one, then.
                            pass

        filename = basename + self.sourceExtension

        dllexport = ''
        dllimport = ''
        if self.platform.startswith('win'):
            dllexport = '__declspec(dllexport) '
            dllimport = '__declspec(dllimport) '

        if not self.cenv:
            self.cenv = CompilationEnvironment(platform = self.platform)

        if compileToExe:
            code = self.frozenMainCode
            if self.platform.startswith('win'):
                code += self.frozenDllMainCode
            initCode = self.mainInitCode % {
                'frozenMainCode' : code,
                'programName' : os.path.basename(basename),
                'dllexport' : dllexport,
                'dllimport' : dllimport,
                }
            if self.platform.startswith('win'):
                initCode += self.frozenExtensions
                target = basename + '.exe'
            else:
                target = basename

            compileFunc = self.cenv.compileExe

        else:
            if self.platform.startswith('win'):
                target = basename + self.cenv.dllext + '.pyd'
            else:
                target = basename + '.so'

            initCode = dllInitCode % {
                'moduleName' : os.path.basename(basename),
                'newcount' : len(moduleList),
                'dllexport' : dllexport,
                'dllimport' : dllimport,
                }
            compileFunc = self.cenv.compileDll

        text = programFile % {
            'moduleDefs' : '\n'.join(moduleDefs),
            'moduleList' : '\n'.join(moduleList),
            'initCode' : initCode,
            }

        file = open(filename, 'w')
        file.write(text)
        file.close()

        try:
            compileFunc(filename, basename)
        finally:
            if (os.path.exists(filename)):
                os.unlink(filename)
            if (os.path.exists(basename + self.objectExtension)):
                os.unlink(basename + self.objectExtension)

        return target

    def makeModuleDef(self, mangledName, code):
        result = ''
        result += 'static unsigned char %s[] = {' % (mangledName)
        for i in range(0, len(code), 16):
            result += '\n  '
            for c in code[i:i+16]:
                result += ('%d,' % ord(c))
        result += '\n};\n'
        return result

    def makeModuleListEntry(self, mangledName, code, moduleName, module):
        size = len(code)
        if getattr(module, "__path__", None):
            # Indicate package by negative size
            size = -size
        return '  {"%s", %s, %s},' % (moduleName, mangledName, size)

    def makeForbiddenModuleListEntry(self, moduleName):
        return '  {"%s", NULL, 0},' % (moduleName)


    def __writingModule(self, moduleName):
        """ Returns true if we are outputting the named module in this
        pass, false if we have already output in a previous pass, or
        if it is not yet on the output table. """

        mdef = self.modules.get(moduleName, (None, None))
        if mdef.exclude:
            return False

        if moduleName in self.previousModules:
            return False

        return True

class PandaModuleFinder(modulefinder.ModuleFinder):
    """ We subclass ModuleFinder here, to add functionality for
    finding the libpandaexpress etc. modules that interrogate
    produces. """

    def __init__(self, *args, **kw):
        modulefinder.ModuleFinder.__init__(self, *args, **kw)

    def import_module(self, partname, fqname, parent):
        if parent and parent.__name__ == 'panda3d':
            # A special case: map a reference to the "panda3d.blah"
            # module into the appropriate Panda3D dll.
            m = getattr(panda3d, partname, None)
            if m:
                libname = m.__libraries__[-1]
                partname = libname
                fqname = libname
                parent = None

        return modulefinder.ModuleFinder.import_module(self, partname, fqname, parent)

    def find_module(self, name, path, parent=None):
        try:
            return modulefinder.ModuleFinder.find_module(self, name, path, parent = parent)
        except ImportError:
            # It wasn't found through the normal channels.  Maybe it's
            # one of ours, or maybe it's frozen?
            if path:
                # Only if we're not looking on a particular path,
                # though.
                raise

            if p3extend_frozen and p3extend_frozen.is_frozen_module(name):
                # It's a frozen module.
                return (None, name, ('', '', imp.PY_FROZEN))

        # Look for a dtool extension.  This loop is roughly lifted
        # from extension_native_helpers.Dtool_PreloadDLL().
        filename = name + dll_suffix + dll_ext
        for dir in sys.path + [sys.prefix]:
            lib = os.path.join(dir, filename)
            if os.path.exists(lib):
                file = open(lib, 'rb')
                return (file, lib, (dll_ext, 'rb', imp.C_EXTENSION))

        message = "DLL loader cannot find %s." % (name)
        raise ImportError, message

    def load_module(self, fqname, fp, pathname, (suffix, mode, type)):
        if type == imp.PY_FROZEN:
            # It's a frozen module.
            co, isPackage = p3extend_frozen.get_frozen_module_code(pathname)
            m = self.add_module(fqname)
            m.__file__ = '<frozen>'
            if isPackage:
                m.__path__ = pathname
            co = marshal.loads(co)
            if self.replace_paths:
                co = self.replace_paths_in_code(co)
            m.__code__ = co
            self.scan_code(co, m)
            self.msgout(2, "load_module ->", m)
            return m

        return modulefinder.ModuleFinder.load_module(self, fqname, fp, pathname, (suffix, mode, type))