


Description 
Types for the general graph colorer.


Synopsis 



Documentation 

type Triv k cls color = cls > UniqSet k > UniqSet color > Bool 
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 GraphColoring Register Allocation
Smith, Ramsey, Holloway  PLDI 2004.


data Graph k cls color 
The Interference graph.
There used to be more fields, but they were turfed out in a previous revision.
maybe we'll want more later..
 Constructors  Graph   graphMap :: UniqFM (Node k cls color)  All active nodes in the graph.





initGraph :: Graph k cls color 
An empty graph.


graphMapModify :: (UniqFM (Node k cls color) > UniqFM (Node k cls color)) > Graph k cls color > Graph k cls color 
Modify the finite map holding the nodes in the graph.


data Node k cls color 
Graph nodes.
Represents a thing that can conflict with another thing.
For the register allocater the nodes represent registers.
 Constructors  Node   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.





newNode :: k > cls > Node k cls color 
An empty node.


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