|Types for the general graph colorer.
A fn to check if a node is trivially colorable
For graphs who's color classes are disjoint then a node is 'trivially colorable'
when it has less neighbors and exclusions than available colors for that node.
For graph's who's color classes overlap, ie some colors alias other colors, then
this can be a bit more tricky. There is a general way to calculate this, but
it's likely be too slow for use in the code. The coloring algorithm takes
a canned function which can be optimised by the user to be specific to the
specific graph being colored.
for details, see A Generalised Algorithm for Graph-Coloring Register Allocation
Smith, Ramsey, Holloway - PLDI 2004.
|The Interference graph.
There used to be more fields, but they were turfed out in a previous revision.
maybe we'll want more later..
|graphMap :: UniqFM (Node k cls color)||All active nodes in the graph.
|An empty graph.
|Modify the finite map holding the nodes in the graph.
Represents a thing that can conflict with another thing.
For the register allocater the nodes represent registers.
|nodeId :: k||A unique identifier for this node.
|nodeClass :: cls||The class of this node,
determines the set of colors that can be used.
|nodeColor :: Maybe color||The color of this node, if any.
|nodeConflicts :: UniqSet k||Neighbors which must be colored differently to this node.
|nodeExclusions :: UniqSet color||Colors that cannot be used by this node.
|nodePreference :: [color]||Colors that this node would prefer to be, in decending order.
|nodeCoalesce :: UniqSet k||Neighbors that this node would like to be colored the same as.
|An empty node.
|Produced by Haddock version 2.6.0|