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268 lines
8.6 KiB
C++
268 lines
8.6 KiB
C++
//===- IPModRef.cpp - Compute IP Mod/Ref information ------------*- C++ -*-===//
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//
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// See high-level comments in include/llvm/Analysis/IPModRef.h
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/IPModRef.h"
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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 "llvm/iOther.h"
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#include "Support/Statistic.h"
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#include "Support/STLExtras.h"
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#include "Support/StringExtras.h"
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//----------------------------------------------------------------------------
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// Private constants and data
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//----------------------------------------------------------------------------
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static RegisterAnalysis<IPModRef>
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Z("ipmodref", "Interprocedural mod/ref analysis");
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//----------------------------------------------------------------------------
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// class ModRefInfo
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//----------------------------------------------------------------------------
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void ModRefInfo::print(std::ostream &O) const
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{
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O << std::endl << "Modified nodes = " << modNodeSet;
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O << "Referenced nodes = " << refNodeSet << std::endl;
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}
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void ModRefInfo::dump() const
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{
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print(std::cerr);
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}
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//----------------------------------------------------------------------------
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// class FunctionModRefInfo
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//----------------------------------------------------------------------------
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// This constructor computes a node numbering for the TD graph.
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//
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FunctionModRefInfo::FunctionModRefInfo(const Function& func,
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IPModRef& ipmro,
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const DSGraph& tdg,
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const DSGraph& ldg)
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: F(func), IPModRefObj(ipmro),
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funcTDGraph(tdg),
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funcLocalGraph(ldg),
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funcModRefInfo(tdg.getGraphSize())
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{
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for (unsigned i=0, N = funcTDGraph.getGraphSize(); i < N; ++i)
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NodeIds[funcTDGraph.getNodes()[i]] = i;
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}
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FunctionModRefInfo::~FunctionModRefInfo()
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{
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for(std::map<const CallInst*, ModRefInfo*>::iterator
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I=callSiteModRefInfo.begin(), E=callSiteModRefInfo.end(); I != E; ++I)
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delete(I->second);
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// Empty map just to make problems easier to track down
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callSiteModRefInfo.clear();
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}
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unsigned FunctionModRefInfo::getNodeId(const Value* value) const {
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return getNodeId(funcTDGraph.getNodeForValue(const_cast<Value*>(value))
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.getNode());
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}
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// Compute Mod/Ref bit vectors for the entire function.
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// These are simply copies of the Read/Write flags from the nodes of
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// the top-down DS graph.
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//
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void FunctionModRefInfo::computeModRef(const Function &func)
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{
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// Mark all nodes in the graph that are marked MOD as being mod
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// and all those marked REF as being ref.
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for (unsigned i = 0, N = funcTDGraph.getGraphSize(); i < N; ++i)
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{
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if (funcTDGraph.getNodes()[i]->isModified())
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funcModRefInfo.setNodeIsMod(i);
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if (funcTDGraph.getNodes()[i]->isRead())
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funcModRefInfo.setNodeIsRef(i);
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}
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// Compute the Mod/Ref info for all call sites within the function
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// Use the Local DSgraph, which includes all the call sites in the
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// original program.
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const std::vector<DSCallSite>& callSites = funcLocalGraph.getFunctionCalls();
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for (unsigned i = 0, N = callSites.size(); i < N; ++i)
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computeModRef(callSites[i].getCallInst());
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}
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// ResolveCallSiteModRefInfo - This method performs the following actions:
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//
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// 1. It clones the top-down graph for the current function
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// 2. It clears all of the mod/ref bits in the cloned graph
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// 3. It then merges the bottom-up graph(s) for the specified call-site into
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// the clone (bringing new mod/ref bits).
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// 4. It returns the clone, and a mapping of nodes from the original TDGraph to
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// the cloned graph with Mod/Ref info for the callsite.
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//
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// NOTE: Because this clones a dsgraph and returns it, the caller is responsible
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// for deleting the returned graph!
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//
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DSGraph *FunctionModRefInfo::ResolveCallSiteModRefInfo(const CallInst &CI,
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std::map<const DSNode*, DSNodeHandle> &NodeMap) {
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// Step #1: Clone the top-down graph...
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std::map<const DSNode*, DSNode*> RawNodeMap;
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DSGraph *Result = new DSGraph(funcTDGraph, RawNodeMap);
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// Convert the NodeMap from a map to DSNode* to be a map to DSNodeHandle's
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NodeMap.insert(RawNodeMap.begin(), RawNodeMap.end());
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// We are now done with the old map... so free it's memory...
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RawNodeMap.clear();
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// Step #2: Clear Mod/Ref information...
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Result->maskNodeTypes(~(DSNode::Modified | DSNode::Read));
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return Result;
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}
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// Compute Mod/Ref bit vectors for a single call site.
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// These are copies of the Read/Write flags from the nodes of
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// the graph produced by clearing all flags in teh caller's TD graph
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// and then inlining the callee's BU graph into the caller's TD graph.
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//
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void
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FunctionModRefInfo::computeModRef(const CallInst& callInst)
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{
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// Allocate the mod/ref info for the call site. Bits automatically cleared.
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ModRefInfo* callModRefInfo = new ModRefInfo(funcTDGraph.getGraphSize());
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callSiteModRefInfo[&callInst] = callModRefInfo;
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// Get a copy of the graph for the callee with the callee inlined
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std::map<const DSNode*, DSNodeHandle> NodeMap;
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DSGraph* csgp = ResolveCallSiteModRefInfo(callInst, NodeMap);
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// For all nodes in the graph, extract the mod/ref information
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const std::vector<DSNode*>& csgNodes = csgp->getNodes();
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const std::vector<DSNode*>& origNodes = funcTDGraph.getNodes();
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assert(csgNodes.size() == origNodes.size());
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for (unsigned i=0, N = csgNodes.size(); i < N; ++i)
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{
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if (csgNodes[i]->isModified())
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callModRefInfo->setNodeIsMod(getNodeId(origNodes[i]));
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if (csgNodes[i]->isRead())
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callModRefInfo->setNodeIsRef(getNodeId(origNodes[i]));
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}
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delete csgp;
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}
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// Print the results of the pass.
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// Currently this just prints bit-vectors and is not very readable.
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//
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void FunctionModRefInfo::print(std::ostream &O) const
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{
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O << "---------- Mod/ref information for function "
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<< F.getName() << "---------- \n\n";
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O << "Mod/ref info for function body:\n";
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funcModRefInfo.print(O);
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for (std::map<const CallInst*, ModRefInfo*>::const_iterator
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CI = callSiteModRefInfo.begin(), CE = callSiteModRefInfo.end();
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CI != CE; ++CI)
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{
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O << "Mod/ref info for call site " << CI->first << ":\n";
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CI->second->print(O);
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}
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O << "\n";
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}
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void FunctionModRefInfo::dump() const
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{
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print(std::cerr);
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}
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//----------------------------------------------------------------------------
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// class IPModRef: An interprocedural pass that computes IP Mod/Ref info.
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//----------------------------------------------------------------------------
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// Free the FunctionModRefInfo objects cached in funcToModRefInfoMap.
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//
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void IPModRef::releaseMemory()
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{
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for(std::map<const Function*, FunctionModRefInfo*>::iterator
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I=funcToModRefInfoMap.begin(), E=funcToModRefInfoMap.end(); I != E; ++I)
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delete(I->second);
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// Clear map so memory is not re-released if we are called again
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funcToModRefInfoMap.clear();
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}
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// Run the "interprocedural" pass on each function. This needs to do
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// NO real interprocedural work because all that has been done the
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// data structure analysis.
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//
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bool IPModRef::run(Module &theModule)
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{
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M = &theModule;
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for (Module::const_iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
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if (! FI->isExternal())
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getFuncInfo(*FI, /*computeIfMissing*/ true);
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return true;
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}
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FunctionModRefInfo& IPModRef::getFuncInfo(const Function& func,
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bool computeIfMissing)
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{
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FunctionModRefInfo*& funcInfo = funcToModRefInfoMap[&func];
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assert (funcInfo != NULL || computeIfMissing);
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if (funcInfo == NULL)
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{ // Create a new FunctionModRefInfo object
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funcInfo = new FunctionModRefInfo(func, *this, // inserts into map
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getAnalysis<TDDataStructures>().getDSGraph(func),
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getAnalysis<LocalDataStructures>().getDSGraph(func));
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funcInfo->computeModRef(func); // computes the mod/ref info
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}
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return *funcInfo;
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}
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// getAnalysisUsage - This pass requires top-down data structure graphs.
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// It modifies nothing.
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//
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void IPModRef::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<LocalDataStructures>();
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AU.addRequired<BUDataStructures>();
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AU.addRequired<TDDataStructures>();
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}
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void IPModRef::print(std::ostream &O) const
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{
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O << "\n========== Results of Interprocedural Mod/Ref Analysis ==========\n";
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for (std::map<const Function*, FunctionModRefInfo*>::const_iterator
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mapI = funcToModRefInfoMap.begin(), mapE = funcToModRefInfoMap.end();
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mapI != mapE; ++mapI)
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mapI->second->print(O);
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O << "\n";
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}
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void IPModRef::dump() const
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{
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print(std::cerr);
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}
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