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fixed loop lower bound bug in loop info and default nullable value in invalid_info

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This commit is contained in:
Margus Veanes 2020-08-21 15:59:56 -07:00
parent 6b11af7ec6
commit 7b478c8406
2 changed files with 2 additions and 2 deletions
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2
src/ast/seq_decl_plugin.cpp
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@ -1867,7 +1867,7 @@ seq_util::rex::info seq_util::rex::info::loop(unsigned lower) const {
if (is_known()) {
//r{l,m} is not normalized if r is nullable but l > 0
unsigned m = min_length * lower;
if (m < min_length || m < lower)
if (m > 0 && (m < min_length || m < lower))
m = UINT_MAX;
bool loop_normalized = (nullable == l_false && lower > 0 ? false : normalized);
lbool loop_nullable = (nullable == l_true || lower == 0 ? l_true : nullable);

2
src/ast/seq_decl_plugin.h
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@ -429,7 +429,7 @@ public:
/* Positive Boolean combination of ranges or predicates or singleton sequences. */
bool singleton{ false };
/* If l_true then empty word is accepted, if l_false then empty word is not accepted. */
lbool nullable{ l_false };
lbool nullable{ l_undef };
/* Lower bound on the length of all accepted words. */
unsigned min_length{ 0 };
/* Maximum nesting depth of Kleene stars. */