generate X86 dispatch code

src/mesa/glapi/glx86asm.py

@@ -0,0 +1,150 @@
+#!/usr/bin/env python
+
+# $Id: glx86asm.py,v 1.1 2000/05/11 23:14:57 brianp Exp $
+
+# Mesa 3-D graphics library
+# Version:  3.3
+# 
+# Copyright (C) 1999-2000  Brian Paul   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
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+# BRIAN PAUL 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.
+
+
+# Generate the glapi_x86.S assembly language file.
+#
+# Usage:
+#    glx86asm.py >glapi_x86.S
+#
+# Dependencies:
+#    The gl.spec file from the SI must be in the current directory.
+#
+# Brian Paul  11 May 2000
+
+
+import string
+import re
+
+
+def PrintHead():
+	print '/* DO NOT EDIT - This file generated automatically with glx86asm.py script */'
+	print '#include "assyntax.h"'
+	print '#include "glapioffsets.h"'
+	print ''
+	print '#ifndef __WIN32__'
+	print ''
+	print '#if defined(USE_MGL_NAMESPACE)'
+	print '#define GL_PREFIX(n) GLNAME(mgl ## n)'
+	print '#else'
+	print '#define GL_PREFIX(n) GLNAME(gl ## n)'
+	print '#endif'
+	print ''
+	print '#define GL_OFFSET(x) CODEPTR(REGOFF(4 * x, EAX))'
+	print ''
+	print '#ifdef GNU_ASSEMBLER'
+	print '#define GLOBL_FN(x) GLOBL x ; .type x,@function'
+	print '#else'
+	print '#define GLOBL_FN(x) GLOBL x'
+	print '#endif'
+	print ''
+	print ''
+	return
+#endif
+
+
+def PrintTail():
+	print ''
+	print '#endif  /* __WIN32__ */'
+#endif
+
+
+def GenerateDispatchCode(name, offset):
+	print 'ALIGNTEXT16'
+	print "GLOBL_FN(GL_PREFIX(%s))" % (name)
+	print "GL_PREFIX(%s):" % (name)
+	print '\tMOV_L(GLNAME(_glapi_Dispatch), EAX)'
+	print '\tTEST_L(EAX, EAX)'
+	print "\tJZ(GLNAME(_glapi_fallback_%s))" % (name)
+	print "\tJMP(GL_OFFSET(_gloffset_%s))" % (offset)
+	print ''
+#enddef
+
+
+def FindAlias(list, funcName):
+	for i in range(0, len(list)):
+		entry = list[i]
+		if entry[0] == funcName:
+			return entry[1]
+		#endif
+	#endfor
+	return ''
+#enddef
+
+
+
+def PrintDefines():
+	functionPattern = re.compile('^[a-zA-Z0-9]+\(')
+	functionNamePattern = re.compile('^[a-zA-Z0-9]+')
+
+	funcName = ''
+	functions = [ ]
+
+	f = open('gl.spec')
+	for line in f.readlines():
+
+		m = functionPattern.match(line)
+		if m:
+			# extract funcName
+			n = functionNamePattern.findall(line)
+			funcName = n[0]
+
+		m = string.split(line)
+		if len(m) > 1:
+			if m[0] == 'param':
+				paramName = m[1]
+			if m[0] == 'offset':
+				if m[1] == '?':
+					#print 'WARNING skipping', funcName
+					noop = 0
+				else:
+					entry = [ funcName, funcName ]
+					functions.append(entry)
+				#endif
+			elif m[0] == 'alias':
+				aliasedName = FindAlias(functions, m[1])
+				if aliasedName:
+					entry = [ funcName, aliasedName ]
+					functions.append(entry)
+				else:
+					print 'WARNING: alias to unknown function:', aliasedName
+				#endif
+			#endif
+		#endif
+	#endfor
+
+	# Now generate the assembly dispatch code
+	for i in range(0, len(functions)):
+		entry = functions[i]
+		GenerateDispatchCode( entry[0], entry[1] )
+
+#enddef
+
+
+
+PrintHead()
+PrintDefines()
+PrintTail()