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95724a4aec
identical to the BU pass, but has an accurate call graph git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9956 91177308-0d34-0410-b5e6-96231b3b80d8
76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
//===- CompleteBottomUp.cpp - Complete Bottom-Up Data Structure Graphs ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the exact same as the bottom-up graphs, but we use take a completed
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// call graph and inline all indirect callees into their callers graphs, making
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// the result more useful for things like pool allocation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/DataStructure.h"
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#include "llvm/Module.h"
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#include "llvm/Analysis/DSGraph.h"
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using namespace llvm;
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namespace {
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RegisterAnalysis<CompleteBUDataStructures>
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X("cbudatastructure", "'Complete' Bottom-up Data Structure Analysis");
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}
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using namespace DS;
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// run - Calculate the bottom up data structure graphs for each function in the
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// program.
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//
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bool CompleteBUDataStructures::run(Module &M) {
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BUDataStructures &BU = getAnalysis<BUDataStructures>();
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GlobalsGraph = new DSGraph(BU.getGlobalsGraph());
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GlobalsGraph->setPrintAuxCalls();
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// Our call graph is the same as the BU data structures call graph
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ActualCallees = BU.getActualCallees();
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#if 1 // REMOVE ME EVENTUALLY
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// FIXME: TEMPORARY (remove once finalization of indirect call sites in the
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// globals graph has been implemented in the BU pass)
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TDDataStructures &TD = getAnalysis<TDDataStructures>();
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// The call graph extractable from the TD pass is _much more complete_ and
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// trustable than that generated by the BU pass so far. Until this is fixed,
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// we hack it like this:
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for (Module::iterator MI = M.begin(), ME = M.end(); MI != ME; ++MI) {
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if (MI->isExternal()) continue;
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const std::vector<DSCallSite> &CSs = TD.getDSGraph(*MI).getFunctionCalls();
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for (unsigned CSi = 0, e = CSs.size(); CSi != e; ++CSi) {
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if (CSs[CSi].isIndirectCall()) {
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Instruction *TheCall = CSs[CSi].getCallSite().getInstruction();
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const std::vector<GlobalValue*> &Callees =
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CSs[CSi].getCalleeNode()->getGlobals();
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for (unsigned i = 0, e = Callees.size(); i != e; ++i)
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if (Function *F = dyn_cast<Function>(Callees[i]))
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ActualCallees.insert(std::make_pair(TheCall, F));
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}
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}
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}
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#endif
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// Start by copying all of the BU data structures graphs over, verbatim.
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (!I->isExternal()) {
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DSInfo[I] = new DSGraph(BU.getDSGraph(*I));
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DSInfo[I]->setGlobalsGraph(GlobalsGraph);
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DSInfo[I]->setPrintAuxCalls();
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}
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return false;
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}
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