[Ad-dev] [ADIC] #54: clean up XAIFTraverse to cover expressions and handle in particular assigments separately

[ADIC]

#54: clean up XAIFTraverse to cover expressions and handle in particular
assigments separately
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 Reporter:  utke             |       Owner:  narayanan
     Type:  task             |      Status:  new      
 Priority:  major            |   Milestone:           
Component:  OA/Sage to XAIF  |     Version:           
 Keywords:                   |  
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Comment(by utke):

 Some notes:

 There is no representation in the xaif for assignments  in comma
 expressions because there is no decent way of handling them.
 The canonicalization phase should resolve comma separated assignments into
 regular assignments.

 The nesting of expressions in variable references (e.g. expressions for
 index computations)
 can be handled by keeping a stack of expressions (currently a list)
 New Expressions are pushed to the stack for each node representing an xaif
 VariableReference during the top down phase and popped and populated
 during the bottom up phase.
 Because we assume the bottom up order is the exact inverse of the top down
 order this should work.

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Ticket URL: <http://trac.mcs.anl.gov/projects/ADIC/ticket/54#comment:1>
ADIC <http://trac.mcs.anl.gov/projects/ADIC>
ADIC: Automatic Differentiation for C and C++