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Viewing changes to pypy/rpython/rctypes/rvoid_p.py

  • Committer: Bazaar Package Importer
  • Author(s): Alexandre Fayolle
  • Date: 2007-04-13 09:33:09 UTC
  • Revision ID: james.westby@ubuntu.com-20070413093309-yoojh4jcoocu2krz
Tags: upstream-1.0.0
Import upstream version 1.0.0

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pypy/rpython/rctypes/rvoid_p.py
 
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from pypy.rpython.rctypes.rmodel import CTypesValueRepr, C_ZERO
 
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from pypy.rpython.rctypes.rstringbuf import StringBufRepr
 
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from pypy.annotation.pairtype import pairtype
 
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from pypy.rpython.rstr import AbstractStringRepr
 
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from pypy.rpython.lltypesystem.rstr import string_repr
 
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from pypy.rpython.rctypes.rchar_p import CCharPRepr
 
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from pypy.rpython.lltypesystem import lltype, llmemory
 
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from pypy.rpython.rctypes.rpointer import PointerRepr
 
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from pypy.rpython.rctypes.rarray import ArrayRepr
 
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class CVoidPRepr(CTypesValueRepr):
 
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    def convert_const(self, value):
 
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        if isinstance(value, self.ctype):
 
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            return super(CVoidPRepr, self).convert_const(value)
 
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        raise NotImplementedError("XXX constant pointer passed to void* arg")
 
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    def rtype_getattr(self, hop):
 
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        s_attr = hop.args_s[1]
 
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        assert s_attr.is_constant()
 
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        assert s_attr.const == 'value'
 
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        v_box = hop.inputarg(self, 0)
 
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        v_c_adr = self.getvalue(hop.llops, v_box)
 
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        hop.exception_cannot_occur()
 
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        return hop.genop('cast_adr_to_int', [v_c_adr],
 
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                         resulttype = lltype.Signed)
 
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class __extend__(pairtype(CCharPRepr, CVoidPRepr),
 
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                 pairtype(PointerRepr, CVoidPRepr)):
 
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    def convert_from_to((r_from, r_to), v, llops):
 
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        v_ptr = r_from.getvalue(llops, v)
 
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        v_adr = llops.genop('cast_ptr_to_adr', [v_ptr],
 
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                            resulttype = llmemory.Address)
 
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        return r_to.return_value(llops, v_adr)
 
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class __extend__(pairtype(StringBufRepr, CVoidPRepr),
 
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                 pairtype(ArrayRepr, CVoidPRepr)):
 
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    def convert_from_to((r_from, r_to), v, llops):
 
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        v_ptr = r_from.get_c_data_of_item(llops, v, C_ZERO)
 
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        v_adr = llops.genop('cast_ptr_to_adr', [v_ptr],
 
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                            resulttype = llmemory.Address)
 
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        return r_to.return_value(llops, v_adr)
 
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class __extend__(pairtype(AbstractStringRepr, CVoidPRepr)):
 
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    def convert_from_to((r_from, r_to), v, llops):
 
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        # warning: no keepalives, only for short-lived conversions like
 
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        # in argument passing
 
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        # r_from could be char_repr: first convert it to string_repr
 
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        v = llops.convertvar(v, r_from, string_repr)
 
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        v_adr = llops.gendirectcall(ll_string2addr, v)
 
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        return r_to.return_value(llops, v_adr)
 
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def ll_string2addr(s):
 
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    if s:
 
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        ptr = lltype.direct_arrayitems(s.chars)
 
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        return llmemory.cast_ptr_to_adr(ptr)
 
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    else:
 
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        return llmemory.NULL