void c_typecheck_baset::typecheck_gcc_switch_case_range(codet &code)
{
if(code.operands().size()!=3)
{
err_location(code);
error() << "gcc_switch_case_range expected to have three operands"
<< eom;
throw 0;
}
typecheck_code(to_code(code.op2()));
if(!case_is_allowed)
{
err_location(code);
error() << "did not expect `case' here" << eom;
throw 0;
}
typecheck_expr(code.op0());
typecheck_expr(code.op1());
implicit_typecast(code.op0(), switch_op_type);
implicit_typecast(code.op1(), switch_op_type);
}
void c_typecheck_baset::typecheck_for(codet &code)
{
if(code.operands().size()!=4)
{
err_location(code);
error() << "for expected to have four operands" << eom;
throw 0;
}
// the "for" statement has an implicit block around it,
// since code.op0() may contain declarations
//
// we therefore transform
//
// for(a;b;c) d;
//
// to
//
// { a; for(;b;c) d; }
//
// if config.ansi_c.for_has_scope
if(!config.ansi_c.for_has_scope ||
code.op0().is_nil())
{
if(code.op0().is_not_nil())
typecheck_code(to_code(code.op0()));
if(code.op1().is_nil())
code.op1()=true_exprt();
else
{
typecheck_expr(code.op1());
implicit_typecast_bool(code.op1());
}
if(code.op2().is_not_nil())
typecheck_expr(code.op2());
if(code.op3().is_not_nil())
{
// save & set flags
bool old_break_is_allowed=break_is_allowed;
bool old_continue_is_allowed=continue_is_allowed;
break_is_allowed=continue_is_allowed=true;
// recursive call
if(to_code(code.op3()).get_statement()==ID_decl_block)
{
code_blockt code_block;
code_block.add_source_location()=code.op3().source_location();
code_block.move_to_operands(code.op3());
code.op3().swap(code_block);
}
typecheck_code(to_code(code.op3()));
// restore flags
break_is_allowed=old_break_is_allowed;
continue_is_allowed=old_continue_is_allowed;
}
}
else
{
code_blockt code_block;
code_block.add_source_location()=code.source_location();
if(to_code(code.op3()).get_statement()==ID_block)
code_block.set(
ID_C_end_location,
to_code_block(to_code(code.op3())).end_location());
else
code_block.set(
ID_C_end_location,
code.op3().source_location());;
code_block.reserve_operands(2);
code_block.move_to_operands(code.op0());
code.op0().make_nil();
code_block.move_to_operands(code);
code.swap(code_block);
typecheck_code(code); // recursive call
}
typecheck_spec_expr(code, ID_C_spec_loop_invariant);
}
void c_typecheck_baset::typecheck_code(codet &code)
{
if(code.id()!=ID_code)
{
err_location(code);
error() << "expected code, got " << code.pretty() << eom;
throw 0;
}
code.type()=code_typet();
const irep_idt &statement=code.get_statement();
if(statement==ID_expression)
typecheck_expression(code);
else if(statement==ID_label)
typecheck_label(to_code_label(code));
else if(statement==ID_switch_case)
typecheck_switch_case(to_code_switch_case(code));
else if(statement==ID_gcc_switch_case_range)
typecheck_gcc_switch_case_range(code);
else if(statement==ID_block)
typecheck_block(code);
else if(statement==ID_decl_block)
{
}
else if(statement==ID_ifthenelse)
typecheck_ifthenelse(to_code_ifthenelse(code));
else if(statement==ID_while)
typecheck_while(to_code_while(code));
else if(statement==ID_dowhile)
typecheck_dowhile(to_code_dowhile(code));
else if(statement==ID_for)
typecheck_for(code);
else if(statement==ID_switch)
typecheck_switch(to_code_switch(code));
else if(statement==ID_break)
typecheck_break(code);
else if(statement==ID_goto)
typecheck_goto(to_code_goto(code));
else if(statement==ID_gcc_computed_goto)
typecheck_gcc_computed_goto(code);
else if(statement==ID_continue)
typecheck_continue(code);
else if(statement==ID_return)
typecheck_return(code);
else if(statement==ID_decl)
typecheck_decl(code);
else if(statement==ID_assign)
typecheck_assign(code);
else if(statement==ID_skip)
{
}
else if(statement==ID_asm)
typecheck_asm(code);
else if(statement==ID_start_thread)
typecheck_start_thread(code);
else if(statement==ID_gcc_local_label)
typecheck_gcc_local_label(code);
else if(statement==ID_msc_try_finally)
{
assert(code.operands().size()==2);
typecheck_code(to_code(code.op0()));
typecheck_code(to_code(code.op1()));
}
else if(statement==ID_msc_try_except)
{
assert(code.operands().size()==3);
typecheck_code(to_code(code.op0()));
typecheck_expr(code.op1());
typecheck_code(to_code(code.op2()));
}
else if(statement==ID_msc_leave)
{
// fine as is, but should check that we
// are in a 'try' block
}
else if(statement==ID_static_assert)
{
assert(code.operands().size()==2);
typecheck_expr(code.op0());
typecheck_expr(code.op1());
}
else if(statement==ID_CPROVER_try_catch ||
statement==ID_CPROVER_try_finally)
{
assert(code.operands().size()==2);
typecheck_code(to_code(code.op0()));
typecheck_code(to_code(code.op1()));
}
else if(statement==ID_CPROVER_throw)
{
assert(code.operands().empty());
}
else if(statement==ID_assume ||
statement==ID_assert)
{
// These are not generated by the C/C++ parsers,
// but we allow them for the benefit of other users
// of the typechecker.
assert(code.operands().size()==1);
typecheck_expr(code.op0());
}
else
{
err_location(code);
error() << "unexpected statement: " << statement << eom;
throw 0;
}
}