#!/usr/bin/env python

# (C) Copyright IBM Corporation 2004, 2005
# 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:
#    Ian Romanick <idr@us.ibm.com>

import license
import gl_XML, glX_XML
import sys, getopt

class PrintGenericStubs(gl_XML.gl_print_base):

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

		self.name = "gl_x86_asm.py (from Mesa)"
		self.license = license.bsd_license_template % ( \
"""Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
(C) Copyright IBM Corporation 2004, 2005""", "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 '#include "x86/assyntax.h"'
		print '#include "glapi/glapioffsets.h"'
		print ''
		print '#if defined(STDCALL_API)'
		print '# if defined(USE_MGL_NAMESPACE)'
		print '#  define GL_PREFIX(n,n2) GLNAME(CONCAT(mgl,n2))'
		print '# else'
		print '#  define GL_PREFIX(n,n2) GLNAME(CONCAT(gl,n2))'
		print '# endif'
		print '#else'
		print '# if defined(USE_MGL_NAMESPACE)'
		print '#  define GL_PREFIX(n,n2) GLNAME(CONCAT(mgl,n))'
		print '#  define _glapi_Dispatch _mglapi_Dispatch'
		print '# else'
		print '#  define GL_PREFIX(n,n2) GLNAME(CONCAT(gl,n))'
		print '# endif'
		print '#endif'
		print ''
		print '#define GL_OFFSET(x) CODEPTR(REGOFF(4 * x, EAX))'
		print ''
		print '#if defined(GNU_ASSEMBLER) && !defined(__DJGPP__) && !defined(__MINGW32__) && !defined(__APPLE__)'
		print '#define GLOBL_FN(x) GLOBL x ; .type x, function'
		print '#else'
		print '#define GLOBL_FN(x) GLOBL x'
		print '#endif'
		print ''
		print '#if defined(PTHREADS) || defined(WIN32_THREADS) || defined(BEOS_THREADS)'
		print '#  define THREADS'
		print '#endif'
		print ''
		print '#ifdef GLX_USE_TLS'
		print ''
		print '#ifdef GLX_X86_READONLY_TEXT'
		print '# define CTX_INSNS MOV_L(GS:(EAX), EAX)'
		print '#else'
		print '# define CTX_INSNS NOP /* Pad for init_glapi_relocs() */'
		print '#endif'
		print ''
		print '#  define GL_STUB(fn,off,fn_alt)\t\t\t\\'
		print 'ALIGNTEXT16;\t\t\t\t\t\t\\'
		print 'GLOBL_FN(GL_PREFIX(fn, fn_alt));\t\t\t\\'
		print 'GL_PREFIX(fn, fn_alt):\t\t\t\t\t\\'
		print '\tCALL(_x86_get_dispatch) ;\t\t\t\\'
		print '\tCTX_INSNS ;					\\'
		print '\tJMP(GL_OFFSET(off))'
		print ''
		print '#elif defined(PTHREADS)'
		print '#  define GL_STUB(fn,off,fn_alt)\t\t\t\\'
		print 'ALIGNTEXT16;\t\t\t\t\t\t\\'
		print 'GLOBL_FN(GL_PREFIX(fn, fn_alt));\t\t\t\\'
		print 'GL_PREFIX(fn, fn_alt):\t\t\t\t\t\\'
		print '\tMOV_L(CONTENT(GLNAME(_glapi_Dispatch)), EAX) ;\t\\'
		print '\tTEST_L(EAX, EAX) ;\t\t\t\t\\'
		print '\tJE(1f) ;\t\t\t\t\t\\'
		print '\tJMP(GL_OFFSET(off)) ;\t\t\t\t\\'
		print '1:\tCALL(_x86_get_dispatch) ;\t\t\t\\'
		print '\tJMP(GL_OFFSET(off))'
		print '#elif defined(THREADS)'
		print '#  define GL_STUB(fn,off,fn_alt)\t\t\t\\'
		print 'ALIGNTEXT16;\t\t\t\t\t\t\\'
		print 'GLOBL_FN(GL_PREFIX(fn, fn_alt));\t\t\t\\'
		print 'GL_PREFIX(fn, fn_alt):\t\t\t\t\t\\'
		print '\tMOV_L(CONTENT(GLNAME(_glapi_Dispatch)), EAX) ;\t\\'
		print '\tTEST_L(EAX, EAX) ;\t\t\t\t\\'
		print '\tJE(1f) ;\t\t\t\t\t\\'
		print '\tJMP(GL_OFFSET(off)) ;\t\t\t\t\\'
		print '1:\tCALL(_glapi_get_dispatch) ;\t\t\t\\'
		print '\tJMP(GL_OFFSET(off))'
		print '#else /* Non-threaded version. */'
		print '#  define GL_STUB(fn,off,fn_alt)\t\t\t\\'
		print 'ALIGNTEXT16;\t\t\t\t\t\t\\'
		print 'GLOBL_FN(GL_PREFIX(fn, fn_alt));\t\t\t\\'
		print 'GL_PREFIX(fn, fn_alt):\t\t\t\t\t\\'
		print '\tMOV_L(CONTENT(GLNAME(_glapi_Dispatch)), EAX) ;\t\\'
		print '\tJMP(GL_OFFSET(off))'
		print '#endif'
		print ''
		print '#ifdef HAVE_ALIAS'
		print '#  define GL_STUB_ALIAS(fn,off,fn_alt,alias,alias_alt)\t\\'
		print '\t.globl\tGL_PREFIX(fn, fn_alt) ;\t\t\t\\'
		print '\t.set\tGL_PREFIX(fn, fn_alt), GL_PREFIX(alias, alias_alt)'
		print '#else'
		print '#  define GL_STUB_ALIAS(fn,off,fn_alt,alias,alias_alt)\t\\'
		print '    GL_STUB(fn, off, fn_alt)'
		print '#endif'
		print ''
		print 'SEG_TEXT'
		print ''
		print '#ifdef GLX_USE_TLS'
		print ''
		print '\tGLOBL\tGLNAME(_x86_get_dispatch)'
		print '\tHIDDEN(GLNAME(_x86_get_dispatch))'
		print 'ALIGNTEXT16'
		print 'GLNAME(_x86_get_dispatch):'
		print '\tcall	1f'
		print '1:\tpopl	%eax'
		print '\taddl	$_GLOBAL_OFFSET_TABLE_+[.-1b], %eax'
		print '\tmovl	_glapi_tls_Dispatch@GOTNTPOFF(%eax), %eax'
		print '\tret'
		print ''
		print '#elif defined(PTHREADS)'
		print 'EXTERN GLNAME(_glapi_Dispatch)'
		print 'EXTERN GLNAME(_gl_DispatchTSD)'
		print 'EXTERN GLNAME(pthread_getspecific)'
		print ''
		print 'ALIGNTEXT16'
		print 'GLNAME(_x86_get_dispatch):'
		print '\tSUB_L(CONST(24), ESP)'
		print '\tPUSH_L(GLNAME(_gl_DispatchTSD))'
		print '\tCALL(GLNAME(pthread_getspecific))'
		print '\tADD_L(CONST(28), ESP)'
		print '\tRET'
		print '#elif defined(THREADS)'
		print 'EXTERN GLNAME(_glapi_get_dispatch)'
		print '#endif'
		print ''

		print '#if defined( GLX_USE_TLS ) && !defined( GLX_X86_READONLY_TEXT )'
		print '\t\t.section\twtext, "awx", @progbits'
		print '#endif /* defined( GLX_USE_TLS ) */'

		print ''
		print '\t\tALIGNTEXT16'
		print '\t\tGLOBL GLNAME(gl_dispatch_functions_start)'
		print '\t\tHIDDEN(GLNAME(gl_dispatch_functions_start))'
		print 'GLNAME(gl_dispatch_functions_start):'
		print ''
		return


	def printRealFooter(self):
		print ''
		print '\t\tGLOBL\tGLNAME(gl_dispatch_functions_end)'
		print '\t\tHIDDEN(GLNAME(gl_dispatch_functions_end))'
		print '\t\tALIGNTEXT16'
		print 'GLNAME(gl_dispatch_functions_end):'
		print ''
		print '#if defined(GLX_USE_TLS) && defined(__linux__)'
		print '	.section ".note.ABI-tag", "a"'
		print '	.p2align 2'
		print '	.long	1f - 0f   /* name length */'
		print '	.long	3f - 2f   /* data length */'
		print '	.long	1         /* note length */'
		print '0:	.asciz "GNU"      /* vendor name */'
		print '1:	.p2align 2'
		print '2:	.long	0         /* note data: the ABI tag */'
		print '	.long	2,4,20    /* Minimum kernel version w/TLS */'
		print '3:	.p2align 2        /* pad out section */'
		print '#endif /* GLX_USE_TLS */'
		print ''
		print '#if defined (__ELF__) && defined (__linux__)'
		print '	.section .note.GNU-stack,"",%progbits'
		print '#endif'
		return


	def printBody(self, api):
		for f in api.functionIterateByOffset():
			name = f.dispatch_name()
			stack = self.get_stack_size(f)
			alt = "%s@%u" % (name, stack)

			print '\tGL_STUB(%s, _gloffset_%s, %s)' % (name, f.name, alt)

			if not f.is_static_entry_point(f.name):
				print '\tHIDDEN(GL_PREFIX(%s, %s))' % (name, alt)


		for f in api.functionIterateByOffset():
			name = f.dispatch_name()
			stack = self.get_stack_size(f)
			alt = "%s@%u" % (name, stack)

			for n in f.entry_points:
				if f.is_static_entry_point(n):
					if n != f.name:
						alt2 = "%s@%u" % (n, stack)
						text = '\tGL_STUB_ALIAS(%s, _gloffset_%s, %s, %s, %s)' % (n, f.name, alt2, name, alt)

						if f.has_different_protocol(n):
							print '#ifndef GLX_INDIRECT_RENDERING'
							print text
							print '#endif'
						else:
							print text

		return

def show_usage():
	print "Usage: %s [-f input_file_name] [-m output_mode]" % sys.argv[0]
	sys.exit(1)

if __name__ == '__main__':
	file_name = "gl_API.xml"
	mode = "generic"

	try:
		(args, trail) = getopt.getopt(sys.argv[1:], "m:f:")
	except Exception,e:
		show_usage()

	for (arg,val) in args:
		if arg == '-m':
			mode = val
		elif arg == "-f":
			file_name = val

	if mode == "generic":
		printer = PrintGenericStubs()
	else:
		print "ERROR: Invalid mode \"%s\" specified." % mode
		show_usage()

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