CBMC
boolbv_union.cpp
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1 /*******************************************************************\
2 
3 Module:
4 
5 Author: Daniel Kroening, kroening@kroening.com
6 
7 \*******************************************************************/
8 
9 #include "boolbv.h"
10 
12 {
13  std::size_t width=boolbv_width(expr.type());
14 
15  const bvt &op_bv=convert_bv(expr.op());
16 
17  INVARIANT(
18  op_bv.size() <= width,
19  "operand bitvector width shall not be larger than the width indicated by "
20  "the union type");
21 
22  bvt bv;
23  bv.resize(width);
24 
25  endianness_mapt map_u = endianness_map(expr.type());
26  endianness_mapt map_op = endianness_map(expr.op().type());
27 
28  for(std::size_t i = 0; i < op_bv.size(); i++)
29  bv[map_u.map_bit(i)] = op_bv[map_op.map_bit(i)];
30 
31  // pad with nondets
32  for(std::size_t i = op_bv.size(); i < bv.size(); i++)
33  bv[map_u.map_bit(i)] = prop.new_variable();
34 
35  return bv;
36 }
37 
39 {
40  return {};
41 }
virtual const bvt & convert_bv(const exprt &expr, const std::optional< std::size_t > expected_width={})
Convert expression to vector of literalts, using an internal cache to speed up conversion if availabl...
Definition: boolbv.cpp:37
virtual bvt convert_empty_union(const empty_union_exprt &expr)
virtual bvt convert_union(const union_exprt &expr)
virtual endianness_mapt endianness_map(const typet &type, bool little_endian) const
Definition: boolbv.h:107
virtual std::size_t boolbv_width(const typet &type) const
Definition: boolbv.h:101
Union constructor to support unions without any member (a GCC/Clang feature).
Definition: std_expr.h:1829
Maps a big-endian offset to a little-endian offset.
size_t map_bit(size_t bit) const
typet & type()
Return the type of the expression.
Definition: expr.h:84
virtual literalt new_variable()=0
const exprt & op() const
Definition: std_expr.h:391
Union constructor from single element.
Definition: std_expr.h:1765
std::vector< literalt > bvt
Definition: literal.h:201