[all-commits] [llvm/llvm-project] 449a13: Add LazyCallGraph API to add function to RefSCC

[Brian Gesiak via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 449a13509190b1c57e5fcf5cd7e8f0f647f564b4
      https://github.com/llvm/llvm-project/commit/449a13509190b1c57e5fcf5cd7e8f0f647f564b4
  Author: Brian Gesiak <modocache at gmail.com>
  Date:   2020-02-17 (Mon, 17 Feb 2020)

  Changed paths:
    M llvm/include/llvm/Analysis/LazyCallGraph.h
    M llvm/lib/Analysis/LazyCallGraph.cpp
    M llvm/unittests/Analysis/CGSCCPassManagerTest.cpp
    M llvm/unittests/Analysis/LazyCallGraphTest.cpp

  Log Message:
  -----------
  Add LazyCallGraph API to add function to RefSCC

Summary:
Depends on https://reviews.llvm.org/D70927.

`LazyCallGraph::addNewFunctionIntoSCC` allows users to insert a new
function node into a call graph, into a specific, existing SCC.

Extend this interface such that functions can be added even when they do
not belong in any existing SCC, but instead in a new SCC within an
existing RefSCC.

The ability to insert new functions as part of a RefSCC is necessary for
outlined functions that do not form a strongly connected cycle with the
function they are outlined from. An example of such a function would be the
coroutine funclets 'f.resume', etc., which are outlined from a coroutine 'f'.
Coroutine 'f' only references the funclets' addresses, it does not call
them directly.

Reviewers: jdoerfert, chandlerc, wenlei, hfinkel

Reviewed By: jdoerfert

Subscribers: hfinkel, JonChesterfield, mehdi_amini, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D72226