temp_slot Struct Reference
Collaboration diagram for temp_slot:
Data Fields | |
| struct temp_slot * | next |
| struct temp_slot * | prev |
| rtx | slot |
| HOST_WIDE_INT | size |
| tree | type |
| unsigned int | align |
| char | in_use |
| int | level |
| HOST_WIDE_INT | base_offset |
| HOST_WIDE_INT | full_size |
Detailed Description
In order to evaluate some expressions, such as function calls returning
structures in memory, we need to temporarily allocate stack locations.
We record each allocated temporary in the following structure.
Associated with each temporary slot is a nesting level. When we pop up
one level, all temporaries associated with the previous level are freed.
Normally, all temporaries are freed after the execution of the statement
in which they were created. However, if we are inside a ({...}) grouping,
the result may be in a temporary and hence must be preserved. If the
result could be in a temporary, we preserve it if we can determine which
one it is in. If we cannot determine which temporary may contain the
result, all temporaries are preserved. A temporary is preserved by
pretending it was allocated at the previous nesting level. Field Documentation
| unsigned int temp_slot::align |
The alignment (in bits) of the slot.
| HOST_WIDE_INT temp_slot::base_offset |
The offset of the slot from the frame_pointer, including extra space
for alignment. This info is for combine_temp_slots.
Referenced by assign_temp().
| HOST_WIDE_INT temp_slot::full_size |
The size of the slot, including extra space for alignment. This
info is for combine_temp_slots.
Referenced by assign_temp().
| char temp_slot::in_use |
Nonzero if this temporary is currently in use.
Referenced by make_slot_available().
| int temp_slot::level |
Nesting level at which this slot is being used.
Referenced by cut_slot_from_list().
| struct temp_slot* temp_slot::next |
Points to next temporary slot.
Referenced by assign_stack_temp(), assign_temp(), insert_temp_slot_address(), and update_temp_slot_address().
| struct temp_slot* temp_slot::prev |
Points to previous temporary slot.
| HOST_WIDE_INT temp_slot::size |
The size, in units, of the slot.
Referenced by assign_temp().
| rtx temp_slot::slot |
The rtx to used to reference the slot.
Referenced by assign_temp(), and remove_unused_temp_slot_addresses().
| tree temp_slot::type |
The type of the object in the slot, or zero if it doesn't correspond
to a type. We use this to determine whether a slot can be reused.
It can be reused if objects of the type of the new slot will always
conflict with objects of the type of the old slot.
The documentation for this struct was generated from the following file:
