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https://github.com/c64scene-ar/llvm-6502.git
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613692c106
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4213 91177308-0d34-0410-b5e6-96231b3b80d8
271 lines
9.9 KiB
C++
271 lines
9.9 KiB
C++
//===- BottomUpClosure.cpp - Compute bottom-up interprocedural closure ----===//
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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.h"
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#include "llvm/Analysis/DSGraph.h"
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#include "llvm/Module.h"
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#include "Support/Statistic.h"
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using std::map;
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static RegisterAnalysis<BUDataStructures>
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X("budatastructure", "Bottom-up Data Structure Analysis Closure");
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// TODO: FIXME
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namespace DataStructureAnalysis {
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// isPointerType - Return true if this first class type is big enough to hold
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// a pointer.
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//
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bool isPointerType(const Type *Ty);
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}
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using namespace DataStructureAnalysis;
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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::releaseMemory() {
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// Delete all call site information
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CallSites.clear();
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for (map<const Function*, DSGraph*>::iterator I = DSInfo.begin(),
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E = DSInfo.end(); I != E; ++I)
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delete I->second;
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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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}
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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::run(Module &M) {
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// Simply calculate the graphs for each function...
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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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calculateGraph(*I);
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return false;
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}
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// ResolveArguments - Resolve the formal and actual arguments for a function
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// call.
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//
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static void ResolveArguments(std::vector<DSNodeHandle> &Call, Function &F,
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map<Value*, DSNodeHandle> &ValueMap) {
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// Resolve all of the function arguments...
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Function::aiterator AI = F.abegin();
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for (unsigned i = 2, e = Call.size(); i != e; ++i) {
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// Advance the argument iterator to the first pointer argument...
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while (!isPointerType(AI->getType())) ++AI;
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// Add the link from the argument scalar to the provided value
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DSNodeHandle &NN = ValueMap[AI];
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NN.addEdgeTo(Call[i]);
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++AI;
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}
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}
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// MergeGlobalNodes - Merge all existing global nodes with globals
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// inlined from the callee or with globals from the GlobalsGraph.
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//
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static void MergeGlobalNodes(DSGraph &Graph,
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map<Value*, DSNodeHandle> &OldValMap) {
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map<Value*, DSNodeHandle> &ValMap = Graph.getValueMap();
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for (map<Value*, DSNodeHandle>::iterator I = ValMap.begin(), E = ValMap.end();
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I != E; ++I)
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if (GlobalValue *GV = dyn_cast<GlobalValue>(I->first)) {
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map<Value*, DSNodeHandle>::iterator NHI = OldValMap.find(GV);
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if (NHI != OldValMap.end()) // was it inlined from the callee?
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I->second.mergeWith(NHI->second);
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#if 0
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else // get it from the GlobalsGraph
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I->second.mergeWith(Graph.cloneGlobalInto(GV));
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#endif
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}
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// Add unused inlined global nodes into the value map
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for (map<Value*, DSNodeHandle>::iterator I = OldValMap.begin(),
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E = OldValMap.end(); I != E; ++I)
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if (isa<GlobalValue>(I->first)) {
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DSNodeHandle &NH = ValMap[I->first]; // If global is not in ValMap...
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if (NH.getNode() == 0)
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NH = I->second; // Add the one just inlined.
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}
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}
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DSGraph &BUDataStructures::calculateGraph(Function &F) {
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// Make sure this graph has not already been calculated, or that we don't get
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// into an infinite loop with mutually recursive functions.
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//
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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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#if 0
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// Populate the GlobalsGraph with globals from this one.
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Graph->GlobalsGraph->cloneGlobals(*Graph, /*cloneCalls*/ false);
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// Save a copy of the original call nodes for the top-down pass
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Graph->saveOrigFunctionCalls();
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#endif
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// Start resolving calls...
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std::vector<std::vector<DSNodeHandle> > &FCs = Graph->getFunctionCalls();
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DEBUG(std::cerr << " [BU] Inlining: " << F.getName() << "\n");
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#if 0
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// Add F to the PendingCallers list of each direct callee for use in the
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// top-down pass so we don't have to compute this again. We don't want
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// to do it for indirect callees inlined later, so remember which calls
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// are in the original FCs set.
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std::set<const DSNode*> directCallees;
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for (unsigned i = 0; i < FCs.size(); ++i)
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directCallees.insert(FCs[i][1]); // ptr to function node
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#endif
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bool Inlined;
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do {
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Inlined = false;
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for (unsigned i = 0; i != FCs.size(); ++i) {
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// Copy the call, because inlining graphs may invalidate the FCs vector.
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std::vector<DSNodeHandle> Call = FCs[i];
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// If the function list is complete...
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if ((Call[1].getNode()->NodeType & DSNode::Incomplete) == 0) {
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// Start inlining all of the functions we can... some may not be
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// inlinable if they are external...
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//
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std::vector<GlobalValue*> Callees(Call[1].getNode()->getGlobals());
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// Loop over the functions, inlining whatever we can...
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for (unsigned c = 0; c != Callees.size(); ++c) {
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// Must be a function type, so this cast MUST succeed.
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Function &FI = cast<Function>(*Callees[c]);
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// Record that this is a call site of FI.
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CallSites[&FI].push_back(CallSite(F, Call));
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if (&FI == &F) {
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// Self recursion... simply link up the formal arguments with the
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// actual arguments...
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DEBUG(std::cerr << "\t[BU] Self Inlining: " << F.getName() << "\n");
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if (Call[0].getNode()) // Handle the return value if present...
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Graph->getRetNode().mergeWith(Call[0]);
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// Resolve the arguments in the call to the actual values...
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ResolveArguments(Call, F, Graph->getValueMap());
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// Erase the entry in the callees vector
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Callees.erase(Callees.begin()+c--);
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} else if (!FI.isExternal()) {
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DEBUG(std::cerr << "\t[BU] In " << F.getName() << " inlining: "
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<< FI.getName() << "\n");
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// Get the data structure graph for the called function, closing it
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// if possible (which is only impossible in the case of mutual
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// recursion...
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//
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DSGraph &GI = calculateGraph(FI); // Graph to inline
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DEBUG(std::cerr << "\t\t[BU] Got graph for " << FI.getName()
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<< " in: " << F.getName() << "\n");
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// Clone the callee's graph into the current graph, keeping
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// track of where scalars in the old graph _used_ to point,
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// and of the new nodes matching nodes of the old graph.
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map<Value*, DSNodeHandle> OldValMap;
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map<const DSNode*, DSNode*> OldNodeMap;
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// The clone call may invalidate any of the vectors in the data
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// structure graph. Strip locals and don't copy the list of callers
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DSNodeHandle RetVal = Graph->cloneInto(GI, OldValMap, OldNodeMap,
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/*StripScalars*/ true,
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/*StripAllocas*/ true,
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/*CopyCallers*/ false,
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/*CopyOrigCalls*/ false);
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// Resolve the arguments in the call to the actual values...
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ResolveArguments(Call, FI, OldValMap);
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if (Call[0].getNode()) // Handle the return value if present
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RetVal.mergeWith(Call[0]);
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// Merge global value nodes in the inlined graph with the global
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// value nodes in the current graph if there are duplicates.
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//
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MergeGlobalNodes(*Graph, OldValMap);
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#if 0
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// If this was an original call, add F to the PendingCallers list
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if (directCallees.find(Call[1]) != directCallees.end())
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GI.addCaller(F);
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#endif
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// Erase the entry in the Callees vector
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Callees.erase(Callees.begin()+c--);
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} else if (FI.getName() == "printf" || FI.getName() == "sscanf" ||
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FI.getName() == "fprintf" || FI.getName() == "open" ||
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FI.getName() == "sprintf") {
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// Erase the entry in the globals vector
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Callees.erase(Callees.begin()+c--);
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}
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}
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if (Callees.empty()) { // Inlined all of the function calls?
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// Erase the call if it is resolvable...
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FCs.erase(FCs.begin()+i--); // Don't skip a the next call...
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Inlined = true;
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} else if (Callees.size() != Call[1].getNode()->getGlobals().size()) {
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// Was able to inline SOME, but not all of the functions. Construct a
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// new global node here.
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//
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assert(0 && "Unimpl!");
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Inlined = true;
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}
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}
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}
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// Recompute the Incomplete markers. If there are any function calls left
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// now that are complete, we must loop!
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if (Inlined) {
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Graph->maskIncompleteMarkers();
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Graph->markIncompleteNodes();
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Graph->removeDeadNodes(/*KeepAllGlobals*/ true, /*KeepCalls*/ true);
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}
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} while (Inlined && !FCs.empty());
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#if 0
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// Copy any unresolved call nodes into the Globals graph and
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// filter out unresolved call nodes inlined from the callee.
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if (!FCs.empty())
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Graph->GlobalsGraph->cloneCalls(*Graph);
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#endif
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Graph->maskIncompleteMarkers();
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Graph->markIncompleteNodes();
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Graph->removeTriviallyDeadNodes(false);
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Graph->removeDeadNodes(/*KeepAllGlobals*/ true, /*KeepCalls*/ true);
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DEBUG(std::cerr << " [BU] Done inlining: " << F.getName() << " ["
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<< Graph->getGraphSize() << "+" << Graph->getFunctionCalls().size()
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<< "]\n");
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return *Graph;
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}
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