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Merge branch 'develop' of github.com:mtrberzi/z3 into develop

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This commit is contained in:
Murphy Berzish 2016-11-09 14:05:38 -05:00
commit 4aa2d965b3
2 changed files with 85 additions and 6 deletions
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61
src/smt/theory_str.cpp
View file

@ -40,6 +40,8 @@ theory_str::theory_str(ast_manager & m):
opt_DisableIntegerTheoryIntegration(false),
opt_DeferEQCConsistencyCheck(false),
opt_CheckVariableScope(true),
opt_UseFastLengthTesterCache(true),
opt_UseFastValueTesterCache(true),
/* Internal setup */
search_started(false),
m_autil(m),
@ -695,8 +697,21 @@ app * theory_str::mk_strlen(expr * e) {
int len = strlen(strval);
return m_autil.mk_numeral(rational(len), true);
} else {
expr * args[1] = {e};
return get_manager().mk_app(get_id(), OP_STRLEN, 0, 0, 1, args);
if (false) {
// use cache
app * lenTerm = NULL;
if (!length_ast_map.find(e, lenTerm)) {
expr * args[1] = {e};
lenTerm = get_manager().mk_app(get_id(), OP_STRLEN, 0, 0, 1, args);
length_ast_map.insert(e, lenTerm);
m_trail.push_back(lenTerm);
}
return lenTerm;
} else {
// always regen
expr * args[1] = {e};
return get_manager().mk_app(get_id(), OP_STRLEN, 0, 0, 1, args);
}
}
}
@ -2783,6 +2798,9 @@ void theory_str::process_concat_eq_type1(expr * concatAst1, expr * concatAst2) {
t2 = varForBreakConcat[key2][1];
xorFlag = varForBreakConcat[key2][2];
}
// TODO do I need to refresh the xorFlag, which is an integer var, and if so, how?
refresh_theory_var(t1);
refresh_theory_var(t2);
}
// For split types 0 through 2, we can get away with providing
@ -3105,6 +3123,8 @@ void theory_str::process_concat_eq_type2(expr * concatAst1, expr * concatAst2) {
temp1 = varForBreakConcat[key2][0];
xorFlag = varForBreakConcat[key2][1];
}
// TODO refresh xorFlag?
refresh_theory_var(temp1);
}
int splitType = -1;
@ -3418,6 +3438,7 @@ void theory_str::process_concat_eq_type3(expr * concatAst1, expr * concatAst2) {
temp1 = varForBreakConcat[key2][0];
xorFlag = varForBreakConcat[key2][1];
}
refresh_theory_var(temp1);
}
@ -3914,6 +3935,7 @@ void theory_str::process_concat_eq_type6(expr * concatAst1, expr * concatAst2) {
commonVar = (entry2->second)[0];
xorFlag = (entry2->second)[1];
}
refresh_theory_var(commonVar);
}
expr ** or_item = alloc_svect(expr*, (overlapLen.size() + 1));
@ -8084,6 +8106,7 @@ expr * theory_str::gen_val_options(expr * freeVar, expr * len_indicator, expr *
ptr_vector<expr> andList;
for (long long i = l; i < h; i++) {
// TODO can we share the val_indicator constants with the length tester cache?
orList.push_back(m.mk_eq(val_indicator, m_strutil.mk_string(longlong_to_string(i).c_str()) ));
if (opt_AggressiveValueTesting) {
literal l = mk_eq(val_indicator, m_strutil.mk_string(longlong_to_string(i).c_str()), false);
@ -8092,7 +8115,16 @@ expr * theory_str::gen_val_options(expr * freeVar, expr * len_indicator, expr *
}
std::string aStr = gen_val_string(len, options[i - l]);
expr * strAst = m_strutil.mk_string(aStr);
expr * strAst;
if (opt_UseFastValueTesterCache) {
if (!valueTesterCache.find(aStr, strAst)) {
strAst = m_strutil.mk_string(aStr);
valueTesterCache.insert(aStr, strAst);
m_trail.push_back(strAst);
}
} else {
strAst = m_strutil.mk_string(aStr);
}
andList.push_back(m.mk_eq(orList[orList.size() - 1], m.mk_eq(freeVar, strAst)));
}
if (!coverAll) {
@ -8654,9 +8686,25 @@ expr * theory_str::gen_len_test_options(expr * freeVar, expr * indicator, int tr
);
for (int i = l; i < h; ++i) {
std::string i_str = int_to_string(i);
expr_ref str_indicator(m_strutil.mk_string(i_str), m);
expr_ref or_expr(ctx.mk_eq_atom(indicator, str_indicator), m); // ARGUMENT 2 IS BOGUS! WRONG SORT
expr_ref str_indicator(m);
if (opt_UseFastLengthTesterCache) {
rational ri(i);
expr * lookup_val;
if(lengthTesterCache.find(ri, lookup_val)) {
str_indicator = expr_ref(lookup_val, m);
} else {
// no match; create and insert
std::string i_str = int_to_string(i);
expr_ref new_val(m_strutil.mk_string(i_str), m);
lengthTesterCache.insert(ri, new_val);
m_trail.push_back(new_val);
str_indicator = expr_ref(new_val, m);
}
} else {
std::string i_str = int_to_string(i);
str_indicator = expr_ref(m_strutil.mk_string(i_str), m);
}
expr_ref or_expr(ctx.mk_eq_atom(indicator, str_indicator), m);
orList.push_back(or_expr);
if (opt_AggressiveLengthTesting) {
@ -8669,6 +8717,7 @@ expr * theory_str::gen_len_test_options(expr * freeVar, expr * indicator, int tr
andList.push_back(and_expr);
}
// TODO cache mk_string("more")
orList.push_back(m.mk_eq(indicator, m_strutil.mk_string("more")));
if (opt_AggressiveLengthTesting) {
literal l = mk_eq(indicator, m_strutil.mk_string("more"), false);

30
src/smt/theory_str.h
View file

@ -88,6 +88,14 @@ namespace smt {
typedef trail_stack<theory_str> th_trail_stack;
typedef union_find<theory_str> th_union_find;
typedef map<rational, expr*, obj_hash<rational>, default_eq<rational> > rational_map;
struct str_hash_proc {
unsigned operator()(std::string const & s) const {
return string_hash(s.c_str(), static_cast<unsigned>(s.length()), 17);
}
};
typedef map<std::string, expr*, str_hash_proc, default_eq<std::string> > string_map;
protected:
// Some options that control how the solver operates.
@ -167,6 +175,20 @@ namespace smt {
*/
bool opt_CheckVariableScope;
/*
* If UseFastLengthTesterCache is set to true,
* length tester terms will not be generated from scratch each time they are needed,
* but will be saved in a map and looked up.
*/
bool opt_UseFastLengthTesterCache;
/*
* If UseFastValueTesterCache is set to true,
* value tester terms will not be generated from scratch each time they are needed,
* but will be saved in a map and looked up.
*/
bool opt_UseFastValueTesterCache;
bool search_started;
arith_util m_autil;
str_util m_strutil;
@ -267,6 +289,14 @@ namespace smt {
expr_ref_vector string_int_conversion_terms;
obj_hashtable<expr> string_int_axioms;
// used when opt_FastLengthTesterCache is true
rational_map lengthTesterCache;
// used when opt_FastValueTesterCache is true
string_map valueTesterCache;
// cache mapping each string S to Length(S)
obj_map<expr, app*> length_ast_map;
th_union_find m_find;
th_trail_stack m_trail_stack;
theory_var get_var(expr * n) const;