temp_slot Class Reference

Collaboration diagram for temp_slot:

Data Fields
class temp_slot *	next
class temp_slot *	prev
rtx	slot
poly_int64	size
tree	type
unsigned int	align
bool	in_use
int	level
poly_int64	base_offset
poly_int64	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

align

unsigned int temp_slot::align

Referenced by assign_stack_temp_for_type().

base_offset

poly_int64 temp_slot::base_offset

Referenced by assign_stack_temp_for_type(), combine_temp_slots(), and find_temp_slot_from_address().

full_size

poly_int64 temp_slot::full_size

Referenced by assign_stack_temp_for_type(), combine_temp_slots(), and find_temp_slot_from_address().

in_use

bool temp_slot::in_use

Referenced by assign_stack_temp_for_type(), make_slot_available(), and remove_unused_temp_slot_addresses_1().

level

int temp_slot::level

Referenced by assign_stack_temp_for_type(), make_slot_available(), move_slot_to_level(), preserve_temp_slots(), and temp_slots_at_level().

next

class temp_slot* temp_slot::next

Referenced by assign_stack_temp_for_type(), combine_temp_slots(), find_temp_slot_from_address(), free_temp_slots(), insert_slot_to_list(), and preserve_temp_slots().

prev

class temp_slot* temp_slot::prev

Referenced by insert_slot_to_list().

size

poly_int64 temp_slot::size

Referenced by assign_stack_temp(), assign_stack_temp_for_type(), assign_temp(), and combine_temp_slots().

slot

rtx temp_slot::slot

Referenced by assign_stack_temp_for_type(), and combine_temp_slots().

type

tree temp_slot::type

Referenced by assign_stack_temp_for_type().

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The documentation for this class was generated from the following file:

• function.cc