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Merged
tautschnig merged 1 commit into from
Dec 15, 2025
Merged

SMV: add lhs() and rhs() helper methods #1484

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25 changes: 21 additions & 4 deletions src/smvlang/smv_parse_tree.h
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Original file line number Diff line number Diff line change
Expand Up @@ -142,20 +142,37 @@ class smv_parse_treet
}

// for ASSIGN_CURRENT, ASSIGN_INIT, ASSIGN_NEXT, DEFINE
const equal_exprt &equal_expr() const
const exprt &lhs() const
{
PRECONDITION(
is_assign_current() || is_assign_init() || is_assign_next() ||
is_define());
return to_equal_expr(expr);
return to_equal_expr(expr).lhs();
}

equal_exprt &equal_expr()
exprt &lhs()
{
PRECONDITION(
is_assign_current() || is_assign_init() || is_assign_next() ||
is_define());
return to_equal_expr(expr);
return to_equal_expr(expr).lhs();
}

// for ASSIGN_CURRENT, ASSIGN_INIT, ASSIGN_NEXT, DEFINE
const exprt &rhs() const
{
PRECONDITION(
is_assign_current() || is_assign_init() || is_assign_next() ||
is_define());
return to_equal_expr(expr).rhs();
}

exprt &rhs()
{
PRECONDITION(
is_assign_current() || is_assign_init() || is_assign_next() ||
is_define());
return to_equal_expr(expr).rhs();
}

void show(std::ostream &) const;
Expand Down
50 changes: 21 additions & 29 deletions src/smvlang/smv_typecheck.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,7 @@ class smv_typecheckt:public typecheckt

void create_var_symbols(const smv_parse_treet::modulet::element_listt &);

void collect_define(const equal_exprt &);
void collect_define(const exprt &lhs, const exprt &rhs);
void convert_defines(exprt::operandst &invar);
void convert_define(const irep_idt &identifier);

Expand Down Expand Up @@ -1966,33 +1966,30 @@ void smv_typecheckt::typecheck(smv_parse_treet::modulet::elementt &element)
return;

case smv_parse_treet::modulet::elementt::ASSIGN_CURRENT:
typecheck(element.equal_expr().lhs(), OTHER);
typecheck(element.equal_expr().rhs(), OTHER);
convert_expr_to(
element.equal_expr().rhs(), element.equal_expr().lhs().type());
element.equal_expr().type() = bool_typet{};
typecheck(element.lhs(), OTHER);
typecheck(element.rhs(), OTHER);
convert_expr_to(element.rhs(), element.lhs().type());
element.expr.type() = bool_typet{};
return;

case smv_parse_treet::modulet::elementt::ASSIGN_INIT:
typecheck(element.equal_expr().lhs(), INIT);
typecheck(element.equal_expr().rhs(), INIT);
convert_expr_to(
element.equal_expr().rhs(), element.equal_expr().lhs().type());
element.equal_expr().type() = bool_typet{};
no_next_allowed(element.equal_expr().rhs());
typecheck(element.lhs(), INIT);
typecheck(element.rhs(), INIT);
convert_expr_to(element.rhs(), element.lhs().type());
no_next_allowed(element.rhs());
element.expr.type() = bool_typet{};
return;

case smv_parse_treet::modulet::elementt::ASSIGN_NEXT:
typecheck(element.equal_expr().lhs(), TRANS);
typecheck(element.equal_expr().rhs(), TRANS);
convert_expr_to(
element.equal_expr().rhs(), element.equal_expr().lhs().type());
element.equal_expr().type() = bool_typet{};
typecheck(element.lhs(), TRANS);
typecheck(element.rhs(), TRANS);
convert_expr_to(element.rhs(), element.lhs().type());
element.expr.type() = bool_typet{};
return;

case smv_parse_treet::modulet::elementt::DEFINE:
typecheck(element.expr, OTHER);
element.equal_expr().type() = bool_typet{};
element.expr.type() = bool_typet{};
return;

case smv_parse_treet::modulet::elementt::ENUM:
Expand Down Expand Up @@ -2077,8 +2074,7 @@ void smv_typecheckt::variable_checks(const smv_parse_treet::modulet &module)
}
else if(element.is_define())
{
const auto &identifier_expr =
to_smv_identifier_expr(to_equal_expr(element.expr).lhs());
const auto &identifier_expr = to_smv_identifier_expr(element.lhs());
irep_idt base_name = identifier_expr.identifier();

// already used as enum?
Expand Down Expand Up @@ -2202,8 +2198,7 @@ void smv_typecheckt::create_var_symbols(
}
else if(element.is_define())
{
const auto &identifier_expr =
to_smv_identifier_expr(to_equal_expr(element.expr).lhs());
const auto &identifier_expr = to_smv_identifier_expr(element.lhs());
irep_idt base_name = identifier_expr.identifier();
irep_idt identifier = module + "::var::" + id2string(base_name);

Expand Down Expand Up @@ -2264,11 +2259,8 @@ Function: smv_typecheckt::collect_define

\*******************************************************************/

void smv_typecheckt::collect_define(const equal_exprt &expr)
void smv_typecheckt::collect_define(const exprt &lhs, const exprt &rhs)
{
const exprt &lhs = expr.lhs();
const exprt &rhs = expr.rhs();

if(lhs.id() != ID_symbol)
throw errort() << "collect_define expects symbol on left hand side";

Expand All @@ -2294,9 +2286,9 @@ void smv_typecheckt::collect_define(const equal_exprt &expr)

if(!result.second)
{
throw errort().with_location(expr.find_source_location())
throw errort().with_location(lhs.source_location())
<< "variable `" << symbol.display_name() << "' already defined";
}
}
}

/*******************************************************************\
Expand Down Expand Up @@ -2475,7 +2467,7 @@ void smv_typecheckt::convert(smv_parse_treet::modulet &smv_module)
for(auto &element : smv_module.elements)
{
if(element.is_define() || element.is_assign_current())
collect_define(element.equal_expr());
collect_define(element.lhs(), element.rhs());
}
// now turn them into INVARs
convert_defines(trans_invar);
Expand Down
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