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[CallGraph] Teach the CallGraph about non-leaf intrinsics.

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Summary:
Currently intrinsics don't affect the creation of the call graph.
This is not accurate with respect to statepoint and patchpoint
intrinsics -- these do call (or invoke) LLVM level functions.

This change fixes this inconsistency by adding a call to the external
node for call sites that call these non-leaf intrinsics.  This coupled
with the fact that these intrinsics also escape the function pointer
they call gives us a conservatively correct call graph.

Reviewers: reames, chandlerc, atrick, pgavlin

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10526

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240039 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjoy Das
2015-06-18 19:28:26 +00:00
parent 6d136d7300
commit aabacb67c3
6 changed files with 59 additions and 4 deletions
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4
include/llvm/Analysis/CallGraph.h
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@ -56,6 +56,7 @@
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Pass.h"
#include <map>
@ -229,7 +230,8 @@ public:
/// \brief Adds a function to the list of functions called by this one.
void addCalledFunction(CallSite CS, CallGraphNode *M) {
assert(!CS.getInstruction() || !CS.getCalledFunction() ||
!CS.getCalledFunction()->isIntrinsic());
!CS.getCalledFunction()->isIntrinsic() ||
!Intrinsic::isLeaf(CS.getCalledFunction()->getIntrinsicID()));
CalledFunctions.emplace_back(CS.getInstruction(), M);
M->AddRef();
}