#!/usr/bin/env python

# (C) Copyright IBM Corporation 2004, 2005
# (C) Copyright Apple Inc. 2011
# Copyright (C) 2015 Intel Corporation
# All Rights Reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# on the rights to use, copy, modify, merge, publish, distribute, sub
# license, and/or sell copies of the Software, and to permit persons to whom
# the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
# IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
# Authors:
#    Jeremy Huddleston <jeremyhu@apple.com>
#
# Based on code ogiginally by:
#    Ian Romanick <idr@us.ibm.com>

import argparse

import license
import gl_XML, glX_XML

header = """/* GLXEXT is the define used in the xserver when the GLX extension is being
 * built.  Hijack this to determine whether this file is being built for the
 * server or the client.
 */
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#if (defined(GLXEXT) && defined(HAVE_BACKTRACE)) \\
	|| (!defined(GLXEXT) && defined(DEBUG) && !defined(__CYGWIN__) && !defined(__MINGW32__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__DragonFly__))
#define USE_BACKTRACE
#endif

#ifdef USE_BACKTRACE
#include <execinfo.h>
#endif

#ifndef _WIN32
#include <dlfcn.h>
#endif
#include <stdlib.h>
#include <stdio.h>

#include "main/glheader.h"

#include "glapi.h"
#include "glapitable.h"

#ifdef GLXEXT
#include "os.h"
#endif

static void
__glapi_gentable_NoOp(void) {
    const char *fstr = "Unknown";

    /* Silence potential GCC warning for some #ifdef paths.
     */
    (void) fstr;
#if defined(USE_BACKTRACE)
#if !defined(GLXEXT)
    if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
#endif
    {
        void *frames[2];

        if(backtrace(frames, 2) == 2) {
            Dl_info info;
            dladdr(frames[1], &info);
            if(info.dli_sname)
                fstr = info.dli_sname;
        }

#if !defined(GLXEXT)
        fprintf(stderr, "Call to unimplemented API: %s\\n", fstr);
#endif
    }
#endif
#if defined(GLXEXT)
    LogMessage(X_ERROR, "GLX: Call to unimplemented API: %s\\n", fstr);
#endif
}

static void
__glapi_gentable_set_remaining_noop(struct _glapi_table *disp) {
    GLuint entries = _glapi_get_dispatch_table_size();
    void **dispatch = (void **) disp;
    unsigned i;

    /* ISO C is annoying sometimes */
    union {_glapi_proc p; void *v;} p;
    p.p = __glapi_gentable_NoOp;

    for(i=0; i < entries; i++)
        if(dispatch[i] == NULL)
            dispatch[i] = p.v;
}

"""

footer = """
struct _glapi_table *
_glapi_create_table_from_handle(void *handle, const char *symbol_prefix) {
    struct _glapi_table *disp = calloc(_glapi_get_dispatch_table_size(), sizeof(_glapi_proc));
    char symboln[512];

    if(!disp)
        return NULL;

    if(symbol_prefix == NULL)
        symbol_prefix = "";

    /* Note: This code relies on _glapi_table_func_names being sorted by the
     * entry point index of each function.
     */
    for (int func_index = 0; func_index < GLAPI_TABLE_COUNT; ++func_index) {
        const char *name = _glapi_table_func_names[func_index];
        void ** procp = &((void **)disp)[func_index];

        snprintf(symboln, sizeof(symboln), \"%s%s\", symbol_prefix, name);
#ifdef _WIN32
        *procp = GetProcAddress(handle, symboln);
#else
        *procp = dlsym(handle, symboln);
#endif
    }
    __glapi_gentable_set_remaining_noop(disp);

    return disp;
}
"""


class PrintCode(gl_XML.gl_print_base):

    def __init__(self):
        gl_XML.gl_print_base.__init__(self)

        self.name = "gl_gentable.py (from Mesa)"
        self.license = license.bsd_license_template % ( \
"""Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
(C) Copyright IBM Corporation 2004, 2005
(C) Copyright Apple Inc 2011""", "BRIAN PAUL, IBM")

        return


    def get_stack_size(self, f):
        size = 0
        for p in f.parameterIterator():
            if p.is_padding:
                continue

            size += p.get_stack_size()

        return size


    def printRealHeader(self):
        print header
        return


    def printRealFooter(self):
        print footer
        return


    def printBody(self, api):

        # Determine how many functions have a defined offset.
        func_count = 0
        for f in api.functions_by_name.itervalues():
            if f.offset != -1:
                func_count += 1

        # Build the mapping from offset to function name.
        funcnames = [None] * func_count
        for f in api.functions_by_name.itervalues():
            if f.offset != -1:
                if not (funcnames[f.offset] is None):
                    raise Exception("Function table has more than one function with same offset (offset %d, func %s)" % (f.offset, f.name))
                funcnames[f.offset] = f.name

        # Check that the table has no gaps.  We expect a function at every offset,
        # and the code which generates the table relies on this.
        for i in xrange(0, func_count):
            if funcnames[i] is None:
                raise Exception("Function table has no function at offset %d" % (i))

        print "#define GLAPI_TABLE_COUNT %d" % func_count
        print "static const char * const _glapi_table_func_names[GLAPI_TABLE_COUNT] = {"
        for i in xrange(0, func_count):
            print "    /* %5d */ \"%s\"," % (i, funcnames[i])
        print "};"

        return


def _parser():
    """Parse arguments and return a namespace object."""
    parser = argparse.ArgumentParser()
    parser.add_argument('-f',
                        dest='filename',
                        default='gl_API.xml',
                        help='An XML file description of an API')

    return parser.parse_args()


def main():
    """Main function."""
    args = _parser()

    printer = PrintCode()

    api = gl_XML.parse_GL_API(args.filename, glX_XML.glx_item_factory())
    printer.Print(api)


if __name__ == '__main__':
    main()
