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Author SHA1 Message Date
River Riddle c774840492 [mlir] Update the CallGraph for nested symbol references, and simplify CallableOpInterface 
Summary:
This enables tracking calls that cross symbol table boundaries. It also simplifies some of the implementation details of CallableOpInterface, i.e. there can only be one region within the callable operation.

Depends On D72042

Reviewed By: jpienaar

Differential Revision: https://reviews.llvm.org/D72043
 2020-01-13 15:51:28 -08:00
Alexander Belyaev 4b0198acb5 Roll-forward initial liveness analysis including test cases. 
Fix the usage of the map size when appending to the map with [].

PiperOrigin-RevId: 284985916
 2019-12-11 08:13:43 -08:00
Alexander Belyaev 984fdde269 Automated rollback of commit 98fbf41044 
PiperOrigin-RevId: 284979684
 2019-12-11 07:17:21 -08:00
Marcel Koester 98fbf41044 Add initial liveness analysis including test cases. 
Closes tensorflow/mlir#255

PiperOrigin-RevId: 284935454
 2019-12-11 01:03:25 -08:00
River Riddle 8cb405a8be Add initial callgraph support. 
Using the two call interfaces, CallOpInterface and CallableOpInterface, this change adds support for an initial multi-level CallGraph. This call graph builds a set of nodes for each callable region, and connects them via edges. An edge may be any of the following types:
* Abstract
  - An edge not produced by a call operation, used for connecting to internal nodes from external nodes.
* Call
  - A call edge is an edge defined via a call-like operation.
* Child
  - This is an artificial edge connecting nested callgraph nodes.

This callgraph will be used, and improved upon, to begin supporting more interesting interprocedural analyses and transformation. In a followup, this callgraph will be used to support more complex inlining support.

PiperOrigin-RevId: 270724968
 2019-09-23 11:44:13 -07:00