StatementAssign *
StatementAssign::make_possible_compound_assign(CGContext &cg_context,
const Type *type,
const Lhs &l,
eAssignOps op,
const Expression &e)
{
eBinaryOps bop = compound_to_binary_ops(op);
const Expression *rhs = NULL;
SafeOpFlags *fs = NULL;
std::string tmp1;
std::string tmp2;
if (bop != MAX_BINARY_OP) {
SafeOpFlags *local_fs = NULL;
FunctionInvocation* fi = NULL;
if (safe_assign(op)) {
local_fs = SafeOpFlags::make_dummy_flags();
fi = new FunctionInvocationBinary(bop, local_fs);
}
else {
local_fs = SafeOpFlags::make_random_binary(type, &(l.get_type()), &(l.get_type()), sOpAssign, bop);
ERROR_GUARD(NULL);
fi = FunctionInvocationBinary::CreateFunctionInvocationBinary(cg_context, bop, local_fs);
tmp1 = dynamic_cast<FunctionInvocationBinary*>(fi)->get_tmp_var1();
tmp2 = dynamic_cast<FunctionInvocationBinary*>(fi)->get_tmp_var2();
}
fs = local_fs->clone();
fi->add_operand(new ExpressionVariable(*(l.get_var()), &l.get_type()));
fi->add_operand(e.clone());
rhs = new ExpressionFuncall(*fi);
}
else {
rhs = &e;
#if 0
if (e.term_type == eFunction) {
const ExpressionFuncall* func = dynamic_cast<const ExpressionFuncall*>(&e);
if (!func->get_invoke().safe_invocation()) {
fs = SafeOpFlags::make_dummy_flags();
fs = NULL;
}
}
#endif
if (op != eSimpleAssign) {
fs = SafeOpFlags::make_random_binary(type, &(l.get_type()), &(rhs->get_type()), sOpAssign, bop);
bool op1 = fs->get_op1_sign();
bool op2 = fs->get_op2_sign();
enum SafeOpSize size = fs->get_op_size();
eSimpleType type1 = SafeOpFlags::flags_to_type(op1, size);
eSimpleType type2 = SafeOpFlags::flags_to_type(op2, size);
const Block *blk = cg_context.get_current_block();
assert(blk);
tmp1 = blk->create_new_tmp_var(type1);
tmp2 = blk->create_new_tmp_var(type2);
ERROR_GUARD(NULL);
}
}
StatementAssign *sa = new StatementAssign(cg_context.get_current_block(), l, op, e, rhs, fs, tmp1, tmp2);
return sa;
}
FunctionInvocation *
FunctionInvocation::make_random_binary(CGContext &cg_context, const Type* type)
{
DEPTH_GUARD_BY_TYPE_RETURN(dtFunctionInvocationRandomBinary, NULL);
if (rnd_flipcoin(10) && Type::has_pointer_type()) {
ERROR_GUARD(NULL);
return make_random_binary_ptr_comparison(cg_context);
}
eBinaryOps op;
do {
op = (eBinaryOps)(rnd_upto(MAX_BINARY_OP, BINARY_OPS_PROB_FILTER));
} while (type->is_float() && !BinaryOpWorksForFloat(op));
ERROR_GUARD(NULL);
assert(type);
SafeOpFlags *flags = SafeOpFlags::make_random_binary(type, NULL, NULL, sOpBinary, op);
assert(flags);
ERROR_GUARD(NULL);
FunctionInvocationBinary *fi = FunctionInvocationBinary::CreateFunctionInvocationBinary(cg_context, op, flags);
Effect lhs_eff_accum;
CGContext lhs_cg_context(cg_context, cg_context.get_effect_context(), &lhs_eff_accum);
// Generate an expression with the correct type required by safe math operands
const Type* lhs_type = flags->get_lhs_type();
const Type* rhs_type = flags->get_rhs_type();
assert(lhs_type && rhs_type);
if (!BinaryOpWorksForFloat(op)) {
assert(!lhs_type->is_float() && "lhs_type is float!");
assert(!rhs_type->is_float() && "rhs_type is float!");
}
Expression *lhs = Expression::make_random(lhs_cg_context, lhs_type);
ERROR_GUARD_AND_DEL1(NULL, fi);
Expression *rhs = 0;
cg_context.merge_param_context(lhs_cg_context, true);
FactMgr* fm = get_fact_mgr(&cg_context);
vector<const Fact*> facts_copy = fm->global_facts;
#if 0
if (lhs->term_type == eVariable) {
lhs_eff_accum.read_deref_volatile((ExpressionVariable*)lhs);
}
#endif
// If we are guaranteed that the LHS will be evaluated before the RHS,
// or if the LHS is pure (not merely side-effect-free),
// then we can generate the RHS under the original effect context.
if (IsOrderedStandardFunc(op)) { // || lhs_eff_accum.is_pure()) { TODO: need more thoughts on the purity issue.
rhs = Expression::make_random(cg_context, rhs_type);
}
else {
// Otherwise, the RHS must be generated under the combined effect
// of the original effect and the LHS effect.
Effect rhs_eff_context(cg_context.get_effect_context());
rhs_eff_context.add_effect(lhs_eff_accum, true);
Effect rhs_eff_accum;
CGContext rhs_cg_context(cg_context, rhs_eff_context, &rhs_eff_accum);
if (op == eLShift || op == eRShift) {
eTermType tt = MAX_TERM_TYPES;
bool not_constant = rnd_flipcoin(ShiftByNonConstantProb);
// avoid shifting negative or too much
if (!not_constant) {
rhs = Constant::make_random_upto(lhs_type->SizeInBytes() * 8);
} else {
rhs = Expression::make_random(rhs_cg_context, rhs_type, NULL, false, true, tt);
}
}
else {
rhs = Expression::make_random(rhs_cg_context, rhs_type);
// avoid divide by zero or possible zero (reached by pointer comparison)
if ((op == eMod || op == eDiv) && (rhs->equals(0) || rhs->is_0_or_1()) &&
!lhs_type->is_float() && !rhs_type->is_float()) {
VectorFilter f;
f.add(eMod).add(eDiv).add(eLShift).add(eRShift);
op = (eBinaryOps)(rnd_upto(MAX_BINARY_OP, &f));
fi->set_operation(op);
}
}
cg_context.merge_param_context(rhs_cg_context, true);
}
ERROR_GUARD_AND_DEL2(NULL, fi, lhs);
if (!BinaryOpWorksForFloat(op)) {
assert(!lhs->get_type().is_float() && "lhs is of float!");
assert(!rhs->get_type().is_float() && "rhs is of float!");
}
if (CompatibleChecker::compatible_check(lhs, rhs)) {
Error::set_error(COMPATIBLE_CHECK_ERROR);
delete lhs;
delete rhs;
delete fi;
return NULL;
}
// ordered operators such as "||" or "&&" may skip the 2nd parameter
if (IsOrderedStandardFunc(op)) {
fm->makeup_new_var_facts(facts_copy, fm->global_facts);
merge_facts(fm->global_facts, facts_copy);
}
// TODO: fix `rhs' for eLShift and eRShift and ...
// Currently, the "fix" is handled in `FunctionInvocationBinary::Output'.
fi->param_value.push_back(lhs);
fi->param_value.push_back(rhs);
return fi;
}