void FpuStackAllocator::allocate_block(BlockBegin* block) {
bool processed_merge = false;
LIR_OpList* insts = block->lir()->instructions_list();
set_lir(block->lir());
set_pos(0);
// Note: insts->length() may change during loop
while (pos() < insts->length()) {
LIR_Op* op = insts->at(pos());
_debug_information_computed = false;
#ifndef PRODUCT
if (TraceFPUStack) {
op->print();
}
check_invalid_lir_op(op);
#endif
LIR_OpBranch* branch = op->as_OpBranch();
LIR_Op1* op1 = op->as_Op1();
LIR_Op2* op2 = op->as_Op2();
LIR_OpCall* opCall = op->as_OpCall();
if (branch != NULL && branch->block() != NULL) {
if (!processed_merge) {
// propagate stack at first branch to a successor
processed_merge = true;
bool required_merge = merge_fpu_stack_with_successors(block);
assert(!required_merge || branch->cond() == lir_cond_always, "splitting of critical edges should prevent FPU stack mismatches at cond branches");
}
} else if (op1 != NULL) {
handle_op1(op1);
} else if (op2 != NULL) {
handle_op2(op2);
} else if (opCall != NULL) {
handle_opCall(opCall);
}
compute_debug_information(op);
set_pos(1 + pos());
}
// Propagate stack when block does not end with branch
if (!processed_merge) {
merge_fpu_stack_with_successors(block);
}
}
void LIR_OopMapGenerator::iterate_one(BlockBegin* block) {
#ifndef PRODUCT
if (TraceLIROopMaps) {
tty->print_cr("Iterating through block %d", block->block_id());
}
#endif
set_block(block);
block->set(BlockBegin::lir_oop_map_gen_reachable_flag);
int i;
if (!is_caching_change_block(block)) {
LIR_OpVisitState state;
LIR_OpList* inst = block->lir()->instructions_list();
int length = inst->length();
for (i = 0; i < length; i++) {
LIR_Op* op = inst->at(i);
LIR_Code code = op->code();
state.visit(op);
for (int j = 0; j < state.info_count(); j++) {
process_info(state.info_at(j));
}
if (code == lir_volatile_move ||
code == lir_move) {
process_move(op);
}
}
}
// Process successors
if (block->end() != _base) {
for (i = 0; i < block->end()->number_of_sux(); i++) {
merge_state(block->end()->sux_at(i));
}
} else {
// Do not traverse OSR entry point of the base
merge_state(_base->std_entry());
}
set_block(NULL);
}
void FpuStackAllocator::allocate_exception_handler(XHandler* xhandler) {
if (!sim()->is_empty()) {
LIR_List* old_lir = lir();
int old_pos = pos();
intArray* old_state = sim()->write_state();
#ifndef PRODUCT
if (TraceFPUStack) {
tty->cr();
tty->print_cr("------- begin of exception handler -------");
}
#endif
if (xhandler->entry_code() == NULL) {
// need entry code to clear FPU stack
LIR_List* entry_code = new LIR_List(_compilation);
entry_code->jump(xhandler->entry_block());
xhandler->set_entry_code(entry_code);
}
LIR_OpList* insts = xhandler->entry_code()->instructions_list();
set_lir(xhandler->entry_code());
set_pos(0);
// Note: insts->length() may change during loop
while (pos() < insts->length()) {
LIR_Op* op = insts->at(pos());
#ifndef PRODUCT
if (TraceFPUStack) {
op->print();
}
check_invalid_lir_op(op);
#endif
switch (op->code()) {
case lir_move:
assert(op->as_Op1() != NULL, "must be LIR_Op1");
assert(pos() != insts->length() - 1, "must not be last operation");
handle_op1((LIR_Op1*)op);
break;
case lir_branch:
assert(op->as_OpBranch()->cond() == lir_cond_always, "must be unconditional branch");
assert(pos() == insts->length() - 1, "must be last operation");
// remove all remaining dead registers from FPU stack
clear_fpu_stack(LIR_OprFact::illegalOpr);
break;
default:
// other operations not allowed in exception entry code
ShouldNotReachHere();
}
set_pos(pos() + 1);
}
#ifndef PRODUCT
if (TraceFPUStack) {
tty->cr();
tty->print_cr("------- end of exception handler -------");
}
#endif
set_lir(old_lir);
set_pos(old_pos);
sim()->read_state(old_state);
}
}