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Add spliceFunction to the CallGraph interface. This allows users to efficiently

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update a callGraph when performing the common operation of splicing the body to
a new function and updating all callers (such as via RAUW).

No users yet, though this is intended for DeadArgumentElimination as part of
PR8887.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122728 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2011-01-03 03:19:35 +00:00
parent 8e7f0d70c7
commit 9ad1cb59de
2 changed files with 25 additions and 2 deletions
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11
include/llvm/Analysis/CallGraph.h
View File

@ -138,6 +138,13 @@ public:
/// not already exist.
CallGraphNode *getOrInsertFunction(const Function *F);
/// spliceFunction - Replace the function represented by this node by another.
/// This does not rescan the body of the function, so it is suitable when
/// splicing the body of one function to another while also updating all
/// callers from the old function to the new.
///
void spliceFunction(const Function *From, const Function *To);
//===---------------------------------------------------------------------
// Pass infrastructure interface glue code.
//
@ -163,8 +170,10 @@ protected:
// CallGraphNode class definition.
//
class CallGraphNode {
AssertingVH<Function> F;
friend class CallGraph;
AssertingVH<Function> F;
// CallRecord - This is a pair of the calling instruction (a call or invoke)
// and the callgraph node being called.
public:

16
lib/Analysis/IPA/CallGraph.cpp
View File

@ -230,6 +230,21 @@ Function *CallGraph::removeFunctionFromModule(CallGraphNode *CGN) {
return F;
}
/// spliceFunction - Replace the function represented by this node by another.
/// This does not rescan the body of the function, so it is suitable when
/// splicing the body of the old function to the new while also updating all
/// callers from old to new.
///
void CallGraph::spliceFunction(const Function *From, const Function *To) {
assert(FunctionMap.count(From) && "No CallGraphNode for function!");
assert(!FunctionMap.count(To) &&
"Pointing CallGraphNode at a function that already exists");
FunctionMapTy::iterator I = FunctionMap.find(From);
I->second->F = const_cast<Function*>(To);
FunctionMap[To] = I->second;
FunctionMap.erase(I);
}
// getOrInsertFunction - This method is identical to calling operator[], but
// it will insert a new CallGraphNode for the specified function if one does
// not already exist.
@ -276,7 +291,6 @@ void CallGraphNode::removeCallEdgeFor(CallSite CS) {
}
}
// removeAnyCallEdgeTo - This method removes any call edges from this node to
// the specified callee function. This takes more time to execute than
// removeCallEdgeTo, so it should not be used unless necessary.