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fix for #975, add mask to ensure character encoding is unique within range of bits used for encoding

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-04-15 09:34:13 +07:00
parent 7bb5e72e07
commit 48638c6f1e
2 changed files with 6 additions and 2 deletions
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3
src/ast/rewriter/seq_rewriter.cpp
View file

@ -1435,6 +1435,7 @@ bool seq_rewriter::reduce_eq(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_
zstring s;
bool lchange = false;
SASSERT(lhs.empty());
TRACE("seq", tout << ls << "\n"; tout << rs << "\n";);
// solve from back
while (true) {
while (!rs.empty() && m_util.str.is_empty(rs.back())) {
@ -1552,9 +1553,11 @@ bool seq_rewriter::reduce_eq(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_
head2 < rs.size() &&
m_util.str.is_string(ls[head1].get(), s1) &&
m_util.str.is_string(rs[head2].get(), s2)) {
TRACE("seq", tout << s1 << " - " << s2 << " " << s1.length() << " " << s2.length() << "\n";);
unsigned l = std::min(s1.length(), s2.length());
for (unsigned i = 0; i < l; ++i) {
if (s1[i] != s2[i]) {
TRACE("seq", tout << "different at position " << i << " " << s1[i] << " " << s2[i] << "\n";);
return false;
}
}

5
src/ast/seq_decl_plugin.cpp
View file

@ -126,13 +126,14 @@ static bool is_escape_char(char const *& s, unsigned& result) {
zstring::zstring(encoding enc): m_encoding(enc) {}
zstring::zstring(char const* s, encoding enc): m_encoding(enc) {
unsigned mask = 0xFF; // TBD for UTF
while (*s) {
unsigned ch;
if (is_escape_char(s, ch)) {
m_buffer.push_back(ch);
m_buffer.push_back(ch & mask);
}
else {
m_buffer.push_back(*s);
m_buffer.push_back(*s & mask);
++s;
}
}