src/mesa/glapi/glx86asm.py

   1 #!/usr/bin/env python
   2
   3 # $Id: glx86asm.py,v 1.8 2003/10/22 21:02:15 kendallb Exp $
   4
   5 # Mesa 3-D graphics library
   6 # Version:  4.1
   7 #
   8 # Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   9 #
  10 # Permission is hereby granted, free of charge, to any person obtaining a
  11 # copy of this software and associated documentation files (the "Software"),
  12 # to deal in the Software without restriction, including without limitation
  13 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
  14 # and/or sell copies of the Software, and to permit persons to whom the
  15 # Software is furnished to do so, subject to the following conditions:
  16 #
  17 # The above copyright notice and this permission notice shall be included
  18 # in all copies or substantial portions of the Software.
  19 #
  20 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  21 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23 # BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  24 # AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  25 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26
  27
  28 # Generate the src/X86/glapi_x86.S file.
  29 #
  30 # Usage:
  31 #    gloffsets.py >glapi_x86.S
  32 #
  33 # Dependencies:
  34 #    The apispec file must be in the current directory.
  35
  36
  37 import apiparser
  38
  39
  40 def PrintHead():
  41         print '/* DO NOT EDIT - This file generated automatically with glx86asm.py script */'
  42         print '#include "assyntax.h"'
  43         print '#include "glapioffsets.h"'
  44         print ''
  45         print '#ifndef __WIN32__'
  46         print ''
  47         print '#if defined(STDCALL_API)'
  48         print '#define GL_PREFIX(n,n2) GLNAME(CONCAT(gl,n2))'
  49         print '#elif defined(USE_MGL_NAMESPACE)'
  50         print '#define GL_PREFIX(n,n2) GLNAME(CONCAT(mgl,n))'
  51         print '#else'
  52         print '#define GL_PREFIX(n,n2) GLNAME(CONCAT(gl,n))'
  53         print '#endif'
  54         print ''
  55         print '#define GL_OFFSET(x) CODEPTR(REGOFF(4 * x, EAX))'
  56         print ''
  57         print '#if defined(GNU_ASSEMBLER) && !defined(DJGPP)'
  58         print '#define GLOBL_FN(x) GLOBL x ; .type x,@function'
  59         print '#else'
  60         print '#define GLOBL_FN(x) GLOBL x'
  61         print '#endif'
  62         print ''
  63         print 'SEG_TEXT'
  64         print ''
  65         print 'EXTERN GLNAME(_glapi_Dispatch)'
  66         print ''
  67         return
  68 #enddef
  69
  70
  71 def PrintTail():
  72         print ''
  73         print '#endif  /* __WIN32__ */'
  74 #enddef
  75
  76
  77
  78 records = []
  79
  80 def FindOffset(funcName):
  81         for (name, alias, offset) in records:
  82                 if name == funcName:
  83                         return offset
  84                 #endif
  85         #endfor
  86         return -1
  87 #enddef
  88
  89 # Find the size of the arguments on the stack for _stdcall name mangling
  90 def FindStackSize(typeList):
  91         result = 0
  92         for typ in typeList:
  93                 if typ == 'GLdouble' or typ == 'GLclampd':
  94                         result += 8;
  95                 else:
  96                         result += 4;
  97                 #endif
  98         #endfor
  99         return result
 100 #enddef
 101
 102 def EmitFunction(name, returnType, argTypeList, argNameList, alias, offset):
 103         argList = apiparser.MakeArgList(argTypeList, argNameList)
 104         if alias != '':
 105                 dispatchName = alias
 106         else:
 107                 dispatchName = name
 108         #endif
 109
 110         if offset < 0:
 111                 # try to find offset from alias name
 112                 assert dispatchName != ''
 113                 offset = FindOffset(dispatchName)
 114                 if offset == -1:
 115                         #print 'Cannot dispatch %s' % name
 116                         return
 117                 #endif
 118         #endif
 119
 120         # save this info in case we need to look up an alias later
 121         records.append((name, dispatchName, offset))
 122
 123         # Find the argument stack size for _stdcall name mangling
 124         stackSize = FindStackSize(argTypeList)
 125
 126         # print the assembly code
 127         print 'ALIGNTEXT16'
 128         print "GLOBL_FN(GL_PREFIX(%s,%s@%s))" % (name, name, stackSize)
 129         print "GL_PREFIX(%s,%s@%s):" % (name, name, stackSize)
 130         print '\tMOV_L(CONTENT(GLNAME(_glapi_Dispatch)), EAX)'
 131         print "\tJMP(GL_OFFSET(_gloffset_%s))" % (dispatchName)
 132         print ''
 133 #enddef
 134
 135 PrintHead()
 136 apiparser.ProcessSpecFile("APIspec", EmitFunction)
 137 PrintTail()