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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20815 91177308-0d34-0410-b5e6-96231b3b80d8
539 lines
19 KiB
C++
539 lines
19 KiB
C++
//===- BottomUpClosure.cpp - Compute bottom-up interprocedural closure ----===//
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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 file implements the BUDataStructures class, which represents the
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// Bottom-Up Interprocedural closure of the data structure graph over the
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// program. This is useful for applications like pool allocation, but **not**
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// applications like alias analysis.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/DataStructure/DataStructure.h"
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#include "llvm/Analysis/DataStructure/DSGraph.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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namespace {
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Statistic<> MaxSCC("budatastructure", "Maximum SCC Size in Call Graph");
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Statistic<> NumBUInlines("budatastructures", "Number of graphs inlined");
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Statistic<> NumCallEdges("budatastructures", "Number of 'actual' call edges");
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RegisterAnalysis<BUDataStructures>
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X("budatastructure", "Bottom-up Data Structure Analysis");
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}
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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 BUDataStructures::runOnModule(Module &M) {
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LocalDataStructures &LocalDSA = getAnalysis<LocalDataStructures>();
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GlobalECs = LocalDSA.getGlobalECs();
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GlobalsGraph = new DSGraph(LocalDSA.getGlobalsGraph(), GlobalECs);
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GlobalsGraph->setPrintAuxCalls();
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IndCallGraphMap = new std::map<std::vector<Function*>,
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std::pair<DSGraph*, std::vector<DSNodeHandle> > >();
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std::vector<Function*> Stack;
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hash_map<Function*, unsigned> ValMap;
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unsigned NextID = 1;
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Function *MainFunc = M.getMainFunction();
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if (MainFunc)
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calculateGraphs(MainFunc, Stack, NextID, ValMap);
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// Calculate the graphs for any functions that are unreachable from main...
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (!I->isExternal() && !DSInfo.count(I)) {
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#ifndef NDEBUG
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if (MainFunc)
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std::cerr << "*** Function unreachable from main: "
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<< I->getName() << "\n";
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#endif
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calculateGraphs(I, Stack, NextID, ValMap); // Calculate all graphs.
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}
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NumCallEdges += ActualCallees.size();
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// If we computed any temporary indcallgraphs, free them now.
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for (std::map<std::vector<Function*>,
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std::pair<DSGraph*, std::vector<DSNodeHandle> > >::iterator I =
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IndCallGraphMap->begin(), E = IndCallGraphMap->end(); I != E; ++I) {
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I->second.second.clear(); // Drop arg refs into the graph.
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delete I->second.first;
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}
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delete IndCallGraphMap;
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// At the end of the bottom-up pass, the globals graph becomes complete.
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// FIXME: This is not the right way to do this, but it is sorta better than
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// nothing! In particular, externally visible globals and unresolvable call
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// nodes at the end of the BU phase should make things that they point to
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// incomplete in the globals graph.
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//
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GlobalsGraph->removeTriviallyDeadNodes();
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GlobalsGraph->maskIncompleteMarkers();
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// Mark external globals incomplete.
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GlobalsGraph->markIncompleteNodes(DSGraph::IgnoreGlobals);
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// Merge the globals variables (not the calls) from the globals graph back
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// into the main function's graph so that the main function contains all of
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// the information about global pools and GV usage in the program.
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if (MainFunc && !MainFunc->isExternal()) {
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DSGraph &MainGraph = getOrCreateGraph(MainFunc);
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const DSGraph &GG = *MainGraph.getGlobalsGraph();
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ReachabilityCloner RC(MainGraph, GG,
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DSGraph::DontCloneCallNodes |
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DSGraph::DontCloneAuxCallNodes);
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// Clone the global nodes into this graph.
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for (DSScalarMap::global_iterator I = GG.getScalarMap().global_begin(),
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E = GG.getScalarMap().global_end(); I != E; ++I)
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if (isa<GlobalVariable>(*I))
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RC.getClonedNH(GG.getNodeForValue(*I));
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MainGraph.maskIncompleteMarkers();
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MainGraph.markIncompleteNodes(DSGraph::MarkFormalArgs |
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DSGraph::IgnoreGlobals);
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}
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return false;
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}
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DSGraph &BUDataStructures::getOrCreateGraph(Function *F) {
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// Has the graph already been created?
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DSGraph *&Graph = DSInfo[F];
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if (Graph) return *Graph;
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// Copy the local version into DSInfo...
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Graph = new DSGraph(getAnalysis<LocalDataStructures>().getDSGraph(*F),
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GlobalECs);
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Graph->setGlobalsGraph(GlobalsGraph);
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Graph->setPrintAuxCalls();
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// Start with a copy of the original call sites...
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Graph->getAuxFunctionCalls() = Graph->getFunctionCalls();
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return *Graph;
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}
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static bool isVAHackFn(const Function *F) {
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return F->getName() == "printf" || F->getName() == "sscanf" ||
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F->getName() == "fprintf" || F->getName() == "open" ||
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F->getName() == "sprintf" || F->getName() == "fputs" ||
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F->getName() == "fscanf";
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}
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static bool isResolvableFunc(const Function* callee) {
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return !callee->isExternal() || isVAHackFn(callee);
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}
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static void GetAllCallees(const DSCallSite &CS,
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std::vector<Function*> &Callees) {
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if (CS.isDirectCall()) {
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if (isResolvableFunc(CS.getCalleeFunc()))
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Callees.push_back(CS.getCalleeFunc());
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} else if (!CS.getCalleeNode()->isIncomplete()) {
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// Get all callees.
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unsigned OldSize = Callees.size();
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CS.getCalleeNode()->addFullFunctionList(Callees);
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// If any of the callees are unresolvable, remove the whole batch!
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for (unsigned i = OldSize, e = Callees.size(); i != e; ++i)
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if (!isResolvableFunc(Callees[i])) {
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Callees.erase(Callees.begin()+OldSize, Callees.end());
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return;
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}
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}
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}
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/// GetAllAuxCallees - Return a list containing all of the resolvable callees in
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/// the aux list for the specified graph in the Callees vector.
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static void GetAllAuxCallees(DSGraph &G, std::vector<Function*> &Callees) {
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Callees.clear();
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for (DSGraph::afc_iterator I = G.afc_begin(), E = G.afc_end(); I != E; ++I)
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GetAllCallees(*I, Callees);
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}
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unsigned BUDataStructures::calculateGraphs(Function *F,
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std::vector<Function*> &Stack,
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unsigned &NextID,
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hash_map<Function*, unsigned> &ValMap) {
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assert(!ValMap.count(F) && "Shouldn't revisit functions!");
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unsigned Min = NextID++, MyID = Min;
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ValMap[F] = Min;
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Stack.push_back(F);
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// FIXME! This test should be generalized to be any function that we have
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// already processed, in the case when there isn't a main or there are
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// unreachable functions!
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if (F->isExternal()) { // sprintf, fprintf, sscanf, etc...
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// No callees!
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Stack.pop_back();
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ValMap[F] = ~0;
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return Min;
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}
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DSGraph &Graph = getOrCreateGraph(F);
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// Find all callee functions.
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std::vector<Function*> CalleeFunctions;
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GetAllAuxCallees(Graph, CalleeFunctions);
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// The edges out of the current node are the call site targets...
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for (unsigned i = 0, e = CalleeFunctions.size(); i != e; ++i) {
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Function *Callee = CalleeFunctions[i];
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unsigned M;
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// Have we visited the destination function yet?
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hash_map<Function*, unsigned>::iterator It = ValMap.find(Callee);
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if (It == ValMap.end()) // No, visit it now.
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M = calculateGraphs(Callee, Stack, NextID, ValMap);
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else // Yes, get it's number.
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M = It->second;
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if (M < Min) Min = M;
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}
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assert(ValMap[F] == MyID && "SCC construction assumption wrong!");
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if (Min != MyID)
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return Min; // This is part of a larger SCC!
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// If this is a new SCC, process it now.
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if (Stack.back() == F) { // Special case the single "SCC" case here.
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DEBUG(std::cerr << "Visiting single node SCC #: " << MyID << " fn: "
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<< F->getName() << "\n");
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Stack.pop_back();
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DSGraph &G = getDSGraph(*F);
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DEBUG(std::cerr << " [BU] Calculating graph for: " << F->getName()<< "\n");
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calculateGraph(G);
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DEBUG(std::cerr << " [BU] Done inlining: " << F->getName() << " ["
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<< G.getGraphSize() << "+" << G.getAuxFunctionCalls().size()
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<< "]\n");
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if (MaxSCC < 1) MaxSCC = 1;
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// Should we revisit the graph? Only do it if there are now new resolvable
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// callees.
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GetAllAuxCallees(Graph, CalleeFunctions);
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if (!CalleeFunctions.empty()) {
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ValMap.erase(F);
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return calculateGraphs(F, Stack, NextID, ValMap);
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} else {
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ValMap[F] = ~0U;
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}
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return MyID;
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} else {
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// SCCFunctions - Keep track of the functions in the current SCC
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//
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hash_set<DSGraph*> SCCGraphs;
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Function *NF;
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std::vector<Function*>::iterator FirstInSCC = Stack.end();
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DSGraph *SCCGraph = 0;
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do {
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NF = *--FirstInSCC;
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ValMap[NF] = ~0U;
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// Figure out which graph is the largest one, in order to speed things up
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// a bit in situations where functions in the SCC have widely different
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// graph sizes.
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DSGraph &NFGraph = getDSGraph(*NF);
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SCCGraphs.insert(&NFGraph);
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// FIXME: If we used a better way of cloning graphs (ie, just splice all
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// of the nodes into the new graph), this would be completely unneeded!
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if (!SCCGraph || SCCGraph->getGraphSize() < NFGraph.getGraphSize())
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SCCGraph = &NFGraph;
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} while (NF != F);
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std::cerr << "Calculating graph for SCC #: " << MyID << " of size: "
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<< SCCGraphs.size() << "\n";
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// Compute the Max SCC Size...
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if (MaxSCC < SCCGraphs.size())
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MaxSCC = SCCGraphs.size();
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// First thing first, collapse all of the DSGraphs into a single graph for
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// the entire SCC. We computed the largest graph, so clone all of the other
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// (smaller) graphs into it. Discard all of the old graphs.
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//
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for (hash_set<DSGraph*>::iterator I = SCCGraphs.begin(),
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E = SCCGraphs.end(); I != E; ++I) {
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DSGraph &G = **I;
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if (&G != SCCGraph) {
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SCCGraph->cloneInto(G);
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// Update the DSInfo map and delete the old graph...
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for (DSGraph::retnodes_iterator I = G.retnodes_begin(),
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E = G.retnodes_end(); I != E; ++I)
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DSInfo[I->first] = SCCGraph;
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delete &G;
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}
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}
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// Clean up the graph before we start inlining a bunch again...
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SCCGraph->removeDeadNodes(DSGraph::KeepUnreachableGlobals);
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// Now that we have one big happy family, resolve all of the call sites in
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// the graph...
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calculateGraph(*SCCGraph);
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DEBUG(std::cerr << " [BU] Done inlining SCC [" << SCCGraph->getGraphSize()
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<< "+" << SCCGraph->getAuxFunctionCalls().size() << "]\n");
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std::cerr << "DONE with SCC #: " << MyID << "\n";
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// We never have to revisit "SCC" processed functions...
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// Drop the stuff we don't need from the end of the stack
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Stack.erase(FirstInSCC, Stack.end());
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return MyID;
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}
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return MyID; // == Min
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}
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// releaseMemory - If the pass pipeline is done with this pass, we can release
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// our memory... here...
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//
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void BUDataStructures::releaseMyMemory() {
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for (hash_map<Function*, DSGraph*>::iterator I = DSInfo.begin(),
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E = DSInfo.end(); I != E; ++I) {
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I->second->getReturnNodes().erase(I->first);
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if (I->second->getReturnNodes().empty())
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delete I->second;
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}
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// Empty map so next time memory is released, data structures are not
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// re-deleted.
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DSInfo.clear();
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delete GlobalsGraph;
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GlobalsGraph = 0;
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}
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void BUDataStructures::calculateGraph(DSGraph &Graph) {
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// Move our call site list into TempFCs so that inline call sites go into the
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// new call site list and doesn't invalidate our iterators!
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std::list<DSCallSite> TempFCs;
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std::list<DSCallSite> &AuxCallsList = Graph.getAuxFunctionCalls();
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TempFCs.swap(AuxCallsList);
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DSGraph::ReturnNodesTy &ReturnNodes = Graph.getReturnNodes();
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bool Printed = false;
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std::vector<Function*> CalledFuncs;
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while (!TempFCs.empty()) {
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DSCallSite &CS = *TempFCs.begin();
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CalledFuncs.clear();
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// Fast path for noop calls. Note that we don't care about merging globals
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// in the callee with nodes in the caller here.
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if (CS.getRetVal().isNull() && CS.getNumPtrArgs() == 0) {
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TempFCs.erase(TempFCs.begin());
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continue;
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} else if (CS.isDirectCall() && isVAHackFn(CS.getCalleeFunc())) {
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TempFCs.erase(TempFCs.begin());
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continue;
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}
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GetAllCallees(CS, CalledFuncs);
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if (CalledFuncs.empty()) {
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// Remember that we could not resolve this yet!
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AuxCallsList.splice(AuxCallsList.end(), TempFCs, TempFCs.begin());
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continue;
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} else {
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DSGraph *GI;
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Instruction *TheCall = CS.getCallSite().getInstruction();
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if (CalledFuncs.size() == 1) {
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Function *Callee = CalledFuncs[0];
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ActualCallees.insert(std::make_pair(TheCall, Callee));
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// Get the data structure graph for the called function.
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GI = &getDSGraph(*Callee); // Graph to inline
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DEBUG(std::cerr << " Inlining graph for " << Callee->getName());
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DEBUG(std::cerr << "[" << GI->getGraphSize() << "+"
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<< GI->getAuxFunctionCalls().size() << "] into '"
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<< Graph.getFunctionNames() << "' [" << Graph.getGraphSize() <<"+"
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<< Graph.getAuxFunctionCalls().size() << "]\n");
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Graph.mergeInGraph(CS, *Callee, *GI,
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DSGraph::StripAllocaBit|DSGraph::DontCloneCallNodes);
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++NumBUInlines;
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} else {
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if (!Printed)
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std::cerr << "In Fns: " << Graph.getFunctionNames() << "\n";
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std::cerr << " calls " << CalledFuncs.size()
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<< " fns from site: " << CS.getCallSite().getInstruction()
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<< " " << *CS.getCallSite().getInstruction();
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std::cerr << " Fns =";
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unsigned NumPrinted = 0;
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for (std::vector<Function*>::iterator I = CalledFuncs.begin(),
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E = CalledFuncs.end(); I != E; ++I) {
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if (NumPrinted++ < 8) std::cerr << " " << (*I)->getName();
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// Add the call edges to the call graph.
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ActualCallees.insert(std::make_pair(TheCall, *I));
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}
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std::cerr << "\n";
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// See if we already computed a graph for this set of callees.
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std::sort(CalledFuncs.begin(), CalledFuncs.end());
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std::pair<DSGraph*, std::vector<DSNodeHandle> > &IndCallGraph =
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(*IndCallGraphMap)[CalledFuncs];
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if (IndCallGraph.first == 0) {
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std::vector<Function*>::iterator I = CalledFuncs.begin(),
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E = CalledFuncs.end();
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// Start with a copy of the first graph.
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GI = IndCallGraph.first = new DSGraph(getDSGraph(**I), GlobalECs);
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GI->setGlobalsGraph(Graph.getGlobalsGraph());
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std::vector<DSNodeHandle> &Args = IndCallGraph.second;
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// Get the argument nodes for the first callee. The return value is
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// the 0th index in the vector.
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GI->getFunctionArgumentsForCall(*I, Args);
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// Merge all of the other callees into this graph.
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for (++I; I != E; ++I) {
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// If the graph already contains the nodes for the function, don't
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// bother merging it in again.
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if (!GI->containsFunction(*I)) {
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GI->cloneInto(getDSGraph(**I));
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++NumBUInlines;
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}
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std::vector<DSNodeHandle> NextArgs;
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GI->getFunctionArgumentsForCall(*I, NextArgs);
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unsigned i = 0, e = Args.size();
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for (; i != e; ++i) {
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if (i == NextArgs.size()) break;
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Args[i].mergeWith(NextArgs[i]);
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}
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for (e = NextArgs.size(); i != e; ++i)
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Args.push_back(NextArgs[i]);
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}
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// Clean up the final graph!
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GI->removeDeadNodes(DSGraph::KeepUnreachableGlobals);
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} else {
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std::cerr << "***\n*** RECYCLED GRAPH ***\n***\n";
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}
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GI = IndCallGraph.first;
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// Merge the unified graph into this graph now.
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DEBUG(std::cerr << " Inlining multi callee graph "
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<< "[" << GI->getGraphSize() << "+"
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<< GI->getAuxFunctionCalls().size() << "] into '"
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<< Graph.getFunctionNames() << "' [" << Graph.getGraphSize() <<"+"
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<< Graph.getAuxFunctionCalls().size() << "]\n");
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Graph.mergeInGraph(CS, IndCallGraph.second, *GI,
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DSGraph::StripAllocaBit |
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DSGraph::DontCloneCallNodes);
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++NumBUInlines;
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}
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}
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TempFCs.erase(TempFCs.begin());
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}
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// Recompute the Incomplete markers
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Graph.maskIncompleteMarkers();
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Graph.markIncompleteNodes(DSGraph::MarkFormalArgs);
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// Delete dead nodes. Treat globals that are unreachable but that can
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// reach live nodes as live.
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Graph.removeDeadNodes(DSGraph::KeepUnreachableGlobals);
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// When this graph is finalized, clone the globals in the graph into the
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// globals graph to make sure it has everything, from all graphs.
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DSScalarMap &MainSM = Graph.getScalarMap();
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ReachabilityCloner RC(*GlobalsGraph, Graph, DSGraph::StripAllocaBit);
|
|
|
|
// Clone everything reachable from globals in the function graph into the
|
|
// globals graph.
|
|
for (DSScalarMap::global_iterator I = MainSM.global_begin(),
|
|
E = MainSM.global_end(); I != E; ++I)
|
|
RC.getClonedNH(MainSM[*I]);
|
|
|
|
//Graph.writeGraphToFile(std::cerr, "bu_" + F.getName());
|
|
}
|
|
|
|
static const Function *getFnForValue(const Value *V) {
|
|
if (const Instruction *I = dyn_cast<Instruction>(V))
|
|
return I->getParent()->getParent();
|
|
else if (const Argument *A = dyn_cast<Argument>(V))
|
|
return A->getParent();
|
|
else if (const BasicBlock *BB = dyn_cast<BasicBlock>(V))
|
|
return BB->getParent();
|
|
return 0;
|
|
}
|
|
|
|
/// deleteValue/copyValue - Interfaces to update the DSGraphs in the program.
|
|
/// These correspond to the interfaces defined in the AliasAnalysis class.
|
|
void BUDataStructures::deleteValue(Value *V) {
|
|
if (const Function *F = getFnForValue(V)) { // Function local value?
|
|
// If this is a function local value, just delete it from the scalar map!
|
|
getDSGraph(*F).getScalarMap().eraseIfExists(V);
|
|
return;
|
|
}
|
|
|
|
if (Function *F = dyn_cast<Function>(V)) {
|
|
assert(getDSGraph(*F).getReturnNodes().size() == 1 &&
|
|
"cannot handle scc's");
|
|
delete DSInfo[F];
|
|
DSInfo.erase(F);
|
|
return;
|
|
}
|
|
|
|
assert(!isa<GlobalVariable>(V) && "Do not know how to delete GV's yet!");
|
|
}
|
|
|
|
void BUDataStructures::copyValue(Value *From, Value *To) {
|
|
if (From == To) return;
|
|
if (const Function *F = getFnForValue(From)) { // Function local value?
|
|
// If this is a function local value, just delete it from the scalar map!
|
|
getDSGraph(*F).getScalarMap().copyScalarIfExists(From, To);
|
|
return;
|
|
}
|
|
|
|
if (Function *FromF = dyn_cast<Function>(From)) {
|
|
Function *ToF = cast<Function>(To);
|
|
assert(!DSInfo.count(ToF) && "New Function already exists!");
|
|
DSGraph *NG = new DSGraph(getDSGraph(*FromF), GlobalECs);
|
|
DSInfo[ToF] = NG;
|
|
assert(NG->getReturnNodes().size() == 1 && "Cannot copy SCC's yet!");
|
|
|
|
// Change the Function* is the returnnodes map to the ToF.
|
|
DSNodeHandle Ret = NG->retnodes_begin()->second;
|
|
NG->getReturnNodes().clear();
|
|
NG->getReturnNodes()[ToF] = Ret;
|
|
return;
|
|
}
|
|
|
|
if (const Function *F = getFnForValue(To)) {
|
|
DSGraph &G = getDSGraph(*F);
|
|
G.getScalarMap().copyScalarIfExists(From, To);
|
|
return;
|
|
}
|
|
|
|
std::cerr << *From;
|
|
std::cerr << *To;
|
|
assert(0 && "Do not know how to copy this yet!");
|
|
abort();
|
|
}
|