src/mesa/glapi/glx86asm.py

   1 #!/usr/bin/env python
   2
   3
   4 # Mesa 3-D graphics library
   5 # Version:  4.1
   6 #
   7 # Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8 #
   9 # Permission is hereby granted, free of charge, to any person obtaining a
  10 # copy of this software and associated documentation files (the "Software"),
  11 # to deal in the Software without restriction, including without limitation
  12 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13 # and/or sell copies of the Software, and to permit persons to whom the
  14 # Software is furnished to do so, subject to the following conditions:
  15 #
  16 # The above copyright notice and this permission notice shall be included
  17 # in all copies or substantial portions of the Software.
  18 #
  19 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22 # BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23 # AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26
  27 # Generate the src/X86/glapi_x86.S file.
  28 #
  29 # Usage:
  30 #    gloffsets.py >glapi_x86.S
  31 #
  32 # Dependencies:
  33 #    The apispec file must be in the current directory.
  34
  35
  36 import apiparser
  37
  38
  39 def PrintHead():
  40         print '/* DO NOT EDIT - This file generated automatically with glx86asm.py script */'
  41         print '#include "assyntax.h"'
  42         print '#include "glapioffsets.h"'
  43         print ''
  44         print '#ifndef __WIN32__'
  45         print ''
  46         print '#if defined(STDCALL_API)'
  47         print '#define GL_PREFIX(n,n2) GLNAME(CONCAT(gl,n2))'
  48         print '#elif defined(USE_MGL_NAMESPACE)'
  49         print '#define GL_PREFIX(n,n2) GLNAME(CONCAT(mgl,n))'
  50         print '#else'
  51         print '#define GL_PREFIX(n,n2) GLNAME(CONCAT(gl,n))'
  52         print '#endif'
  53         print ''
  54         print '#define GL_OFFSET(x) CODEPTR(REGOFF(4 * x, EAX))'
  55         print ''
  56         print '#if defined(GNU_ASSEMBLER) && !defined(__DJGPP__) && !defined(__MINGW32__)'
  57         print '#define GLOBL_FN(x) GLOBL x ; .type x,@function'
  58         print '#else'
  59         print '#define GLOBL_FN(x) GLOBL x'
  60         print '#endif'
  61         print ''
  62         print 'SEG_TEXT'
  63         print ''
  64         print 'EXTERN GLNAME(_glapi_Dispatch)'
  65         print ''
  66         return
  67 #enddef
  68
  69
  70 def PrintTail():
  71         print ''
  72         print '#endif  /* __WIN32__ */'
  73 #enddef
  74
  75
  76
  77 records = []
  78
  79 def FindOffset(funcName):
  80         for (name, alias, offset) in records:
  81                 if name == funcName:
  82                         return offset
  83                 #endif
  84         #endfor
  85         return -1
  86 #enddef
  87
  88 # Find the size of the arguments on the stack for _stdcall name mangling
  89 def FindStackSize(typeList):
  90         result = 0
  91         for typ in typeList:
  92                 if typ == 'GLdouble' or typ == 'GLclampd':
  93                         result += 8;
  94                 else:
  95                         result += 4;
  96                 #endif
  97         #endfor
  98         return result
  99 #enddef
 100
 101 def EmitFunction(name, returnType, argTypeList, argNameList, alias, offset):
 102         argList = apiparser.MakeArgList(argTypeList, argNameList)
 103         if alias != '':
 104                 dispatchName = alias
 105         else:
 106                 dispatchName = name
 107         #endif
 108
 109         if offset < 0:
 110                 # try to find offset from alias name
 111                 assert dispatchName != ''
 112                 offset = FindOffset(dispatchName)
 113                 if offset == -1:
 114                         #print 'Cannot dispatch %s' % name
 115                         return
 116                 #endif
 117         #endif
 118
 119         # save this info in case we need to look up an alias later
 120         records.append((name, dispatchName, offset))
 121
 122         # Find the argument stack size for _stdcall name mangling
 123         stackSize = FindStackSize(argTypeList)
 124
 125         # print the assembly code
 126         print 'ALIGNTEXT16'
 127         print "GLOBL_FN(GL_PREFIX(%s,%s@%s))" % (name, name, stackSize)
 128         print "GL_PREFIX(%s,%s@%s):" % (name, name, stackSize)
 129         print '\tMOV_L(CONTENT(GLNAME(_glapi_Dispatch)), EAX)'
 130         print "\tJMP(GL_OFFSET(_gloffset_%s))" % (dispatchName)
 131         print ''
 132 #enddef
 133
 134 PrintHead()
 135 apiparser.ProcessSpecFile("APIspec", EmitFunction)
 136 PrintTail()