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EndsWith decl and rewriter, WIP

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This commit is contained in:
Murphy Berzish 2016-06-14 17:55:46 -04:00
parent 4f131ebba7
commit fd38b4c729
6 changed files with 79 additions and 1 deletions
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25
src/ast/rewriter/str_rewriter.cpp
View file

@ -69,6 +69,28 @@ br_status str_rewriter::mk_str_StartsWith(expr * haystack, expr * needle, expr_r
}
}
br_status str_rewriter::mk_str_EndsWith(expr * haystack, expr * needle, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (EndsWith " << mk_pp(haystack, m()) << " " << mk_pp(needle, m()) << ")" << std::endl;);
if (m_strutil.is_string(haystack) && m_strutil.is_string(needle)) {
TRACE("t_str_rw", tout << "evaluating constant EndsWith predicate" << std::endl;);
std::string haystackStr = m_strutil.get_string_constant_value(haystack);
std::string needleStr = m_strutil.get_string_constant_value(needle);
if (haystackStr.length() < needleStr.length()) {
result = m().mk_false();
return BR_DONE;
} else {
if (haystackStr.substr(haystackStr.length() - needleStr.length(), needleStr.length()) == needleStr) {
result = m().mk_true();
} else {
result = m().mk_false();
}
return BR_DONE;
}
} else {
return BR_FAILED;
}
}
br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result) {
SASSERT(f->get_family_id() == get_fid());
@ -82,6 +104,9 @@ br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_STR_STARTSWITH:
SASSERT(num_args == 2);
return mk_str_StartsWith(args[0], args[1], result);
case OP_STR_ENDSWITH:
SASSERT(num_args == 2);
return mk_str_EndsWith(args[0], args[1], result);
default:
return BR_FAILED;
}

1
src/ast/rewriter/str_rewriter.h
View file

@ -42,6 +42,7 @@ public:
br_status mk_str_CharAt(expr * arg0, expr * arg1, expr_ref & result);
br_status mk_str_StartsWith(expr * haystack, expr * needle, expr_ref & result);
br_status mk_str_EndsWith(expr * haystack, expr * needle, expr_ref & result);
bool reduce_eq(expr * l, expr * r, expr_ref_vector & lhs, expr_ref_vector & rhs, bool & change);
bool reduce_eq(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_vector& lhs, expr_ref_vector& rhs, bool& change);

7
src/ast/str_decl_plugin.cpp
View file

@ -28,6 +28,7 @@ str_decl_plugin::str_decl_plugin():
m_length_decl(0),
m_charat_decl(0),
m_startswith_decl(0),
m_endswith_decl(0),
m_arith_plugin(0),
m_arith_fid(0),
m_int_sort(0){
@ -43,6 +44,7 @@ void str_decl_plugin::finalize(void) {
DEC_REF(m_length_decl);
DEC_REF(m_charat_decl);
DEC_REF(m_startswith_decl);
DEC_REF(m_endswith_decl);
DEC_REF(m_int_sort);
}
@ -78,6 +80,9 @@ void str_decl_plugin::set_manager(ast_manager * m, family_id id) {
m_startswith_decl = m->mk_func_decl(symbol("StartsWith"), s, s, boolT, func_decl_info(id, OP_STR_STARTSWITH));
m_manager->inc_ref(m_startswith_decl);
m_endswith_decl = m->mk_func_decl(symbol("EndsWith"), s, s, boolT, func_decl_info(id, OP_STR_ENDSWITH));
m_manager->inc_ref(m_endswith_decl);
}
decl_plugin * str_decl_plugin::mk_fresh() {
@ -97,6 +102,7 @@ func_decl * str_decl_plugin::mk_func_decl(decl_kind k) {
case OP_STRLEN: return m_length_decl;
case OP_STR_CHARAT: return m_charat_decl;
case OP_STR_STARTSWITH: return m_startswith_decl;
case OP_STR_ENDSWITH: return m_endswith_decl;
default: return 0;
}
}
@ -155,6 +161,7 @@ void str_decl_plugin::get_op_names(svector<builtin_name> & op_names, symbol cons
op_names.push_back(builtin_name("Length", OP_STRLEN));
op_names.push_back(builtin_name("CharAt", OP_STR_CHARAT));
op_names.push_back(builtin_name("StartsWith", OP_STR_STARTSWITH));
op_names.push_back(builtin_name("EndsWith", OP_STR_ENDSWITH));
}
void str_decl_plugin::get_sort_names(svector<builtin_name> & sort_names, symbol const & logic) {

2
src/ast/str_decl_plugin.h
View file

@ -33,6 +33,7 @@ enum str_op_kind {
// higher-level string functions -- these are reduced to basic operations
OP_STR_CHARAT,
OP_STR_STARTSWITH,
OP_STR_ENDSWITH,
// end
LAST_STR_OP
};
@ -47,6 +48,7 @@ protected:
func_decl * m_charat_decl;
func_decl * m_startswith_decl;
func_decl * m_endswith_decl;
arith_decl_plugin * m_arith_plugin;
family_id m_arith_fid;