live_track Class Reference

Collaboration diagram for live_track:

Data Fields
bitmap_obstack	obstack
bitmap_head	live_base_var
bitmap_head *	live_base_partitions
var_map	map

Detailed Description

This structure is used to efficiently record the current status of live
SSA_NAMES when building a conflict graph.
LIVE_BASE_VAR has a bit set for each base variable which has at least one
ssa version live.
LIVE_BASE_PARTITIONS is an array of bitmaps using the basevar table as an
index, and is used to track what partitions of each base variable are
live.  This makes it easy to add conflicts between just live partitions
with the same base variable.
The values in LIVE_BASE_PARTITIONS are only valid if the base variable is
marked as being live.  This delays clearing of these bitmaps until
they are actually needed again.   

Field Documentation

live_base_partitions

bitmap_head* live_track::live_base_partitions

Referenced by delete_live_track(), live_track_add_partition(), live_track_live_p(), live_track_process_def(), live_track_remove_partition(), and new_live_track().

live_base_var

bitmap_head live_track::live_base_var

Referenced by live_track_add_partition(), live_track_clear_base_vars(), live_track_live_p(), live_track_process_def(), live_track_remove_partition(), and new_live_track().

map

var_map live_track::map

Referenced by live_track_add_partition(), live_track_clear_var(), live_track_live_p(), live_track_process_def(), live_track_process_use(), live_track_remove_partition(), and new_live_track().

obstack

bitmap_obstack live_track::obstack

Referenced by delete_live_track(), and new_live_track().

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

• tree-ssa-coalesce.cc