static
String handle_static_float_constant(CPrintStyleModule *state,
const SuifObject *obj)
{
FloatConstant *expr = to<FloatConstant>(obj);
return(expr->get_value().c_str());
}
/* Another helper function for print_var_def(). This function
* expects that it will need to add a return before printing
* anything, and it expects that you will add a return after
* it is done.
* It returns the number of bits of initialization data that it
* generates.
*/
int
PrinterX86::process_value_block(ValueBlock *vblk)
{
int bits_filled = 0;
if (is_a<ExpressionValueBlock>(vblk)) {
// An ExpressionValueBlock either holds a constant value or a
// simple expression representing either an address relative to
// a symbol or a pointer generated by conversion from an integer
// constant (presumably zero).
ExpressionValueBlock *evb = (ExpressionValueBlock*)vblk;
Expression *exp = evb->get_expression();
if (is_a<IntConstant>(exp)) {
IntConstant *ic = (IntConstant*)exp;
bits_filled = print_size_directive(ic->get_result_type());
fprint(out, ic->get_value());
cur_opnd_cnt++;
}
else if (is_a<FloatConstant>(exp)) {
FloatConstant *fc = (FloatConstant*)exp;
bits_filled = print_size_directive(fc->get_result_type());
fputs(fc->get_value().c_str(), out);
cur_opnd_cnt++;
}
else {
// We use non-constant ExpressionValueBlocks to hold a symbolic
// address, optionally with an offset, or a pointer initializer
// consisting of a `convert' expression.
// A SymbolAddressExpression represents a plain symbolic
// address.
// An address obtained by conversion from another type is a
// unary expression with opcode "convert".
// A symbol+delta is represented by an add whose first operand
// is the load-address and whose second is an IntConstant
// expression.
// No other kind of "expression" is recognized.
if (is_a<UnaryExpression>(exp)) {
UnaryExpression *ux = (UnaryExpression*)exp;
claim(ux->get_opcode() == k_convert,
"unexpected unary expression in expression block");
DataType *tt = ux->get_result_type(); // target type
claim(is_kind_of<PointerType>(tt),
"unexpected target type when converting initializer");
exp = ux->get_source();
if (is_a<IntConstant>(exp)) {
IntConstant *ic = (IntConstant*)exp;
bits_filled = print_size_directive(tt);
fprint(out, ic->get_value());
cur_opnd_cnt++;
return bits_filled;
}
// Fall through to handle symbol-relative address, on the
// assumption that the front end validated the conversion.
}
SymbolAddressExpression *sax;
long delta;
if (is_a<BinaryExpression>(exp)) {
BinaryExpression *bx = (BinaryExpression*)exp;
claim(bx->get_opcode() == k_add,
"unexpected binary expression in expression block");
Expression *s1 = bx->get_source1();
Expression *s2 = bx->get_source2();
sax = to<SymbolAddressExpression>(s1);
delta = to<IntConstant>(s2)->get_value().c_long();
} else if (is_a<SymbolAddressExpression>(exp)) {
sax = (SymbolAddressExpression*)exp;
delta = 0;
} else {
claim(false, "unexpected kind of expression block");
}
Sym *sym = sax->get_addressed_symbol();
// symbol initialization
bits_filled = print_size_directive(type_ptr);
print_sym(sym);
if (delta != 0) {
fprintf(out, "%+ld", delta);
}
// always force the start of a new data directive
cur_opcode = opcode_null;
cur_opnd_cnt = 0;
}
}
else if (is_a<MultiValueBlock>(vblk)) {
MultiValueBlock *mvb = (MultiValueBlock*)vblk;
for (int i = 0; i < mvb->get_sub_block_count(); i++ ) {
int offset = mvb->get_sub_block(i).first.c_int();
claim(offset >= bits_filled);
if (bits_filled < offset) // pad to offset
bits_filled += print_bit_filler(offset - bits_filled);
bits_filled += process_value_block(mvb->get_sub_block(i).second);
}
int all_bits = get_bit_size(mvb->get_type());
if (all_bits > bits_filled)
bits_filled += print_bit_filler(all_bits - bits_filled);
} else if (is_a<RepeatValueBlock>(vblk)) {
// Simplifying assumption: We now expect the front-end
// to remove initialization code of large arrays of zeros.
RepeatValueBlock *rvb = (RepeatValueBlock*)vblk;
int repeat_cnt = rvb->get_num_repetitions();
if (repeat_cnt > 1) { // insert .repeat pseudo-op
fprintf(out, "\n\t%s\t%d", x86_opcode_names[REPEAT], repeat_cnt);
cur_opcode = opcode_null; // force new data directive
}
// actual data directive
bits_filled = repeat_cnt * process_value_block(rvb->get_sub_block());
if (repeat_cnt > 1) { // insert .endr pseudo-op
fprintf(out, "\n\t%s", x86_opcode_names[ENDR]);
cur_opcode = opcode_null; // force new data directive
}
} else if (is_a<UndefinedValueBlock>(vblk)) {
bits_filled += print_bit_filler(get_bit_size(vblk->get_type()));
} else {
claim(false, "unexpected kind of ValueBlock");
}
return bits_filled;
}
Constant* MiniConstantPropagationPass::Merge(Constant* x, Constant* y,
LString opcode)
{
assert(theEnv != NULL) ;
if (x == NULL || y == NULL)
{
return NULL ;
}
IntConstant* xInt = dynamic_cast<IntConstant*>(x) ;
IntConstant* yInt = dynamic_cast<IntConstant*>(y) ;
FloatConstant* xFloat = dynamic_cast<FloatConstant*>(x) ;
FloatConstant* yFloat = dynamic_cast<FloatConstant*>(y) ;
// This mini propagation only cares for addition and subtraction. Other
// propagations will be handled in a later pass.
if (opcode == LString("add"))
{
if (xInt != NULL && yInt != NULL)
{
int mergedValue = xInt->get_value().c_int() + yInt->get_value().c_int() ;
return create_int_constant(theEnv, xInt->get_result_type(),
IInteger(mergedValue)) ;
}
if (xFloat != NULL && yFloat != NULL)
{
float mergedValue = StringToFloat(xFloat->get_value()) +
StringToFloat(yFloat->get_value()) ;
return create_float_constant(theEnv, xFloat->get_result_type(),
FloatToString(mergedValue)) ;
}
if (xInt != NULL && yFloat != NULL)
{
float mergedValue = xInt->get_value().c_int() +
StringToFloat(yFloat->get_value()) ;
return create_float_constant(theEnv, yFloat->get_result_type(),
FloatToString(mergedValue)) ;
}
if (xFloat != NULL && yInt != NULL)
{
float mergedValue = StringToFloat(xFloat->get_value()) +
yInt->get_value().c_int() ;
return create_float_constant(theEnv, xFloat->get_result_type(),
FloatToString(mergedValue)) ;
}
}
if (opcode == LString("subtract"))
{
if (xInt != NULL && yInt != NULL)
{
int mergedValue = xInt->get_value().c_int() - yInt->get_value().c_int() ;
return create_int_constant(theEnv, xInt->get_result_type(),
IInteger(mergedValue)) ;
}
if (xFloat != NULL && yFloat != NULL)
{
float mergedValue = StringToFloat(xFloat->get_value()) -
StringToFloat(yFloat->get_value()) ;
return create_float_constant(theEnv, xFloat->get_result_type(),
FloatToString(mergedValue)) ;
}
if (xInt != NULL && yFloat != NULL)
{
float mergedValue = xInt->get_value().c_int() -
StringToFloat(yFloat->get_value()) ;
return create_float_constant(theEnv, yFloat->get_result_type(),
FloatToString(mergedValue)) ;
}
if (xFloat != NULL && yInt != NULL)
{
float mergedValue = StringToFloat(xFloat->get_value()) -
yInt->get_value().c_int() ;
return create_float_constant(theEnv, xFloat->get_result_type(),
FloatToString(mergedValue)) ;
}
}
return NULL ;
}
void ConstantArrayPropagationPass::ReplaceLoad(LoadExpression* load,
ArrayReferenceExpression* ref,
VariableSymbol* var,
ValueBlock* topBlock)
{
list<IntConstant*> allDimensions ;
IntConstant* nextIndex = dynamic_cast<IntConstant*>(ref->get_index()) ;
if (nextIndex == NULL)
{
OutputWarning("Trying to access a constant array with a nonconstant index!") ;
delete var->remove_annote_by_name("ConstPropArray") ;
// assert(0) ;
return ;
}
allDimensions.push_front(nextIndex) ;
ArrayReferenceExpression* nextDimension =
dynamic_cast<ArrayReferenceExpression*>(ref->get_base_array_address()) ;
while (nextDimension != NULL)
{
nextIndex = dynamic_cast<IntConstant*>(nextDimension->get_index()) ;
assert(nextIndex != NULL) ;
allDimensions.push_front(nextIndex) ;
nextDimension = dynamic_cast<ArrayReferenceExpression*>(nextDimension->get_base_array_address()) ;
}
ValueBlock* currentBlock = topBlock ;
list<IntConstant*>::iterator dimIter = allDimensions.begin() ;
for (int i = 0 ; i < allDimensions.size() ; ++i)
{
MultiValueBlock* multiBlock = dynamic_cast<MultiValueBlock*>(currentBlock);
assert(multiBlock != NULL) ;
currentBlock = multiBlock->lookup_sub_block((*dimIter)->get_value()) ;
++dimIter ;
}
ExpressionValueBlock* finalBlock =
dynamic_cast<ExpressionValueBlock*>(currentBlock) ;
assert(finalBlock != NULL &&
"Attempted to use an uninitialized constant value!") ;
Expression* replacementValue = finalBlock->get_expression() ;
if (dynamic_cast<IntConstant*>(replacementValue) != NULL)
{
IntConstant* constInt =
dynamic_cast<IntConstant*>(replacementValue) ;
IntConstant* replacement =
create_int_constant(theEnv,
constInt->get_result_type(),
constInt->get_value()) ;
load->get_parent()->replace(load, replacement) ;
delete load ;
}
else if (dynamic_cast<FloatConstant*>(replacementValue) != NULL)
{
FloatConstant* constFloat =
dynamic_cast<FloatConstant*>(replacementValue) ;
FloatConstant* replacement =
create_float_constant(theEnv,
constFloat->get_result_type(),
constFloat->get_value()) ;
load->get_parent()->replace(load, replacement) ;
delete load ;
}
else
{
assert(0 && "Unknown constant") ;
}
}