mirror of
https://github.com/c64scene-ar/llvm-6502.git
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4ad02e726d
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5786 91177308-0d34-0410-b5e6-96231b3b80d8
447 lines
17 KiB
C++
447 lines
17 KiB
C++
//===-- PoolAllocate.cpp - Pool Allocation Pass ---------------------------===//
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//
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// This transform changes programs so that disjoint data structures are
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// allocated out of different pools of memory, increasing locality.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/PoolAllocate.h"
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#include "llvm/Transforms/Utils/Cloning.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/DerivedTypes.h"
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#include "llvm/Constants.h"
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#include "llvm/Instructions.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/InstVisitor.h"
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#include "Support/Statistic.h"
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#include "Support/VectorExtras.h"
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using namespace PA;
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namespace {
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const Type *VoidPtrTy = PointerType::get(Type::SByteTy);
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// The type to allocate for a pool descriptor: { sbyte*, uint }
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const Type *PoolDescType =
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StructType::get(make_vector<const Type*>(VoidPtrTy, Type::UIntTy, 0));
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const PointerType *PoolDescPtr = PointerType::get(PoolDescType);
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RegisterOpt<PoolAllocate>
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X("poolalloc", "Pool allocate disjoint data structures");
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}
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void PoolAllocate::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<BUDataStructures>();
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AU.addRequired<TargetData>();
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}
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bool PoolAllocate::run(Module &M) {
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if (M.begin() == M.end()) return false;
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CurModule = &M;
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AddPoolPrototypes();
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BU = &getAnalysis<BUDataStructures>();
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std::map<Function*, Function*> FuncMap;
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// Loop over only the function initially in the program, don't traverse newly
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// added ones. If the function uses memory, make its clone.
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Module::iterator LastOrigFunction = --M.end();
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for (Module::iterator I = M.begin(); ; ++I) {
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if (!I->isExternal())
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if (Function *R = MakeFunctionClone(*I))
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FuncMap[I] = R;
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if (I == LastOrigFunction) break;
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}
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++LastOrigFunction;
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// Now that all call targets are available, rewrite the function bodies of the
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// clones.
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for (Module::iterator I = M.begin(); I != LastOrigFunction; ++I)
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if (!I->isExternal()) {
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std::map<Function*, Function*>::iterator FI = FuncMap.find(I);
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ProcessFunctionBody(*I, FI != FuncMap.end() ? *FI->second : *I);
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}
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FunctionInfo.clear();
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return true;
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}
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// AddPoolPrototypes - Add prototypes for the pool functions to the specified
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// module and update the Pool* instance variables to point to them.
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//
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void PoolAllocate::AddPoolPrototypes() {
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CurModule->addTypeName("PoolDescriptor", PoolDescType);
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// Get poolinit function...
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FunctionType *PoolInitTy =
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FunctionType::get(Type::VoidTy,
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make_vector<const Type*>(PoolDescPtr, Type::UIntTy, 0),
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false);
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PoolInit = CurModule->getOrInsertFunction("poolinit", PoolInitTy);
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// Get pooldestroy function...
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std::vector<const Type*> PDArgs(1, PoolDescPtr);
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FunctionType *PoolDestroyTy =
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FunctionType::get(Type::VoidTy, PDArgs, false);
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PoolDestroy = CurModule->getOrInsertFunction("pooldestroy", PoolDestroyTy);
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// Get the poolalloc function...
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FunctionType *PoolAllocTy = FunctionType::get(VoidPtrTy, PDArgs, false);
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PoolAlloc = CurModule->getOrInsertFunction("poolalloc", PoolAllocTy);
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// Get the poolfree function...
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PDArgs.push_back(VoidPtrTy); // Pointer to free
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FunctionType *PoolFreeTy = FunctionType::get(Type::VoidTy, PDArgs, false);
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PoolFree = CurModule->getOrInsertFunction("poolfree", PoolFreeTy);
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#if 0
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Args[0] = Type::UIntTy; // Number of slots to allocate
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FunctionType *PoolAllocArrayTy = FunctionType::get(VoidPtrTy, Args, true);
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PoolAllocArray = CurModule->getOrInsertFunction("poolallocarray",
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PoolAllocArrayTy);
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#endif
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}
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// MakeFunctionClone - If the specified function needs to be modified for pool
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// allocation support, make a clone of it, adding additional arguments as
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// neccesary, and return it. If not, just return null.
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//
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Function *PoolAllocate::MakeFunctionClone(Function &F) {
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DSGraph &G = BU->getDSGraph(F);
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std::vector<DSNode*> &Nodes = G.getNodes();
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if (Nodes.empty()) return 0; // No memory activity, nothing is required
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FuncInfo &FI = FunctionInfo[&F]; // Create a new entry for F
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FI.Clone = 0;
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// Find DataStructure nodes which are allocated in pools non-local to the
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// current function. This set will contain all of the DSNodes which require
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// pools to be passed in from outside of the function.
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hash_set<DSNode*> &MarkedNodes = FI.MarkedNodes;
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// Mark globals and incomplete nodes as live... (this handles arguments)
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if (F.getName() != "main")
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for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
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if (Nodes[i]->NodeType & (DSNode::GlobalNode | DSNode::Incomplete) &&
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Nodes[i]->NodeType & (DSNode::HeapNode))
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Nodes[i]->markReachableNodes(MarkedNodes);
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// Marked the returned node as alive...
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if (DSNode *RetNode = G.getRetNode().getNode())
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if (RetNode->NodeType & DSNode::HeapNode)
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RetNode->markReachableNodes(MarkedNodes);
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if (MarkedNodes.empty()) // We don't need to clone the function if there
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return 0; // are no incoming arguments to be added.
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// Figure out what the arguments are to be for the new version of the function
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const FunctionType *OldFuncTy = F.getFunctionType();
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std::vector<const Type*> ArgTys;
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ArgTys.reserve(OldFuncTy->getParamTypes().size() + MarkedNodes.size());
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FI.ArgNodes.reserve(MarkedNodes.size());
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for (hash_set<DSNode*>::iterator I = MarkedNodes.begin(),
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E = MarkedNodes.end(); I != E; ++I)
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if ((*I)->NodeType & DSNode::Incomplete) {
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ArgTys.push_back(PoolDescPtr); // Add the appropriate # of pool descs
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FI.ArgNodes.push_back(*I);
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}
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if (FI.ArgNodes.empty()) return 0; // No nodes to be pool allocated!
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ArgTys.insert(ArgTys.end(), OldFuncTy->getParamTypes().begin(),
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OldFuncTy->getParamTypes().end());
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// Create the new function prototype
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FunctionType *FuncTy = FunctionType::get(OldFuncTy->getReturnType(), ArgTys,
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OldFuncTy->isVarArg());
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// Create the new function...
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Function *New = new Function(FuncTy, GlobalValue::InternalLinkage,
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F.getName(), F.getParent());
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// Set the rest of the new arguments names to be PDa<n> and add entries to the
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// pool descriptors map
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std::map<DSNode*, Value*> &PoolDescriptors = FI.PoolDescriptors;
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Function::aiterator NI = New->abegin();
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for (unsigned i = 0, e = FI.ArgNodes.size(); i != e; ++i, ++NI) {
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NI->setName("PDa"); // Add pd entry
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PoolDescriptors.insert(std::make_pair(FI.ArgNodes[i], NI));
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}
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// Map the existing arguments of the old function to the corresponding
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// arguments of the new function.
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std::map<const Value*, Value*> ValueMap;
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for (Function::aiterator I = F.abegin(), E = F.aend(); I != E; ++I, ++NI) {
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ValueMap[I] = NI;
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NI->setName(I->getName());
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}
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// Populate the value map with all of the globals in the program.
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// FIXME: This should be unneccesary!
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Module &M = *F.getParent();
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for (Module::iterator I = M.begin(), E=M.end(); I!=E; ++I) ValueMap[I] = I;
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for (Module::giterator I = M.gbegin(), E=M.gend(); I!=E; ++I) ValueMap[I] = I;
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// Perform the cloning.
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std::vector<ReturnInst*> Returns;
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CloneFunctionInto(New, &F, ValueMap, Returns);
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// Invert the ValueMap into the NewToOldValueMap
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std::map<Value*, const Value*> &NewToOldValueMap = FI.NewToOldValueMap;
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for (std::map<const Value*, Value*>::iterator I = ValueMap.begin(),
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E = ValueMap.end(); I != E; ++I)
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NewToOldValueMap.insert(std::make_pair(I->second, I->first));
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return FI.Clone = New;
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}
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// processFunction - Pool allocate any data structures which are contained in
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// the specified function...
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//
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void PoolAllocate::ProcessFunctionBody(Function &F, Function &NewF) {
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DSGraph &G = BU->getDSGraph(F);
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std::vector<DSNode*> &Nodes = G.getNodes();
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if (Nodes.empty()) return; // Quick exit if nothing to do...
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FuncInfo &FI = FunctionInfo[&F]; // Get FuncInfo for F
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hash_set<DSNode*> &MarkedNodes = FI.MarkedNodes;
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DEBUG(std::cerr << "[" << F.getName() << "] Pool Allocate: ");
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// Loop over all of the nodes which are non-escaping, adding pool-allocatable
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// ones to the NodesToPA vector.
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std::vector<DSNode*> NodesToPA;
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for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
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if (Nodes[i]->NodeType & DSNode::HeapNode && // Pick nodes with heap elems
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!(Nodes[i]->NodeType & DSNode::Array) && // Doesn't handle arrays yet.
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!MarkedNodes.count(Nodes[i])) // Can't be marked
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NodesToPA.push_back(Nodes[i]);
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DEBUG(std::cerr << NodesToPA.size() << " nodes to pool allocate\n");
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if (!NodesToPA.empty()) {
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// Create pool construction/destruction code
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std::map<DSNode*, Value*> &PoolDescriptors = FI.PoolDescriptors;
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CreatePools(NewF, NodesToPA, PoolDescriptors);
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}
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// Transform the body of the function now...
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TransformFunctionBody(NewF, G, FI);
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}
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// CreatePools - This creates the pool initialization and destruction code for
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// the DSNodes specified by the NodesToPA list. This adds an entry to the
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// PoolDescriptors map for each DSNode.
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//
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void PoolAllocate::CreatePools(Function &F,
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const std::vector<DSNode*> &NodesToPA,
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std::map<DSNode*, Value*> &PoolDescriptors) {
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// Find all of the return nodes in the CFG...
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std::vector<BasicBlock*> ReturnNodes;
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for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
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if (isa<ReturnInst>(I->getTerminator()))
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ReturnNodes.push_back(I);
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TargetData &TD = getAnalysis<TargetData>();
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// Loop over all of the pools, inserting code into the entry block of the
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// function for the initialization and code in the exit blocks for
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// destruction.
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//
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Instruction *InsertPoint = F.front().begin();
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for (unsigned i = 0, e = NodesToPA.size(); i != e; ++i) {
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DSNode *Node = NodesToPA[i];
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// Create a new alloca instruction for the pool...
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Value *AI = new AllocaInst(PoolDescType, 0, "PD", InsertPoint);
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Value *ElSize =
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ConstantUInt::get(Type::UIntTy, TD.getTypeSize(Node->getType()));
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// Insert the call to initialize the pool...
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new CallInst(PoolInit, make_vector(AI, ElSize, 0), "", InsertPoint);
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// Update the PoolDescriptors map
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PoolDescriptors.insert(std::make_pair(Node, AI));
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// Insert a call to pool destroy before each return inst in the function
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for (unsigned r = 0, e = ReturnNodes.size(); r != e; ++r)
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new CallInst(PoolDestroy, make_vector(AI, 0), "",
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ReturnNodes[r]->getTerminator());
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}
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}
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namespace {
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/// FuncTransform - This class implements transformation required of pool
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/// allocated functions.
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struct FuncTransform : public InstVisitor<FuncTransform> {
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PoolAllocate &PAInfo;
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DSGraph &G;
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FuncInfo &FI;
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FuncTransform(PoolAllocate &P, DSGraph &g, FuncInfo &fi)
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: PAInfo(P), G(g), FI(fi) {}
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void visitMallocInst(MallocInst &MI);
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void visitFreeInst(FreeInst &FI);
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void visitCallInst(CallInst &CI);
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private:
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DSNode *getDSNodeFor(Value *V) {
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if (!FI.NewToOldValueMap.empty()) {
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// If the NewToOldValueMap is in effect, use it.
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std::map<Value*,const Value*>::iterator I = FI.NewToOldValueMap.find(V);
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if (I != FI.NewToOldValueMap.end())
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V = (Value*)I->second;
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}
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return G.getScalarMap()[V].getNode();
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}
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Value *getPoolHandle(Value *V) {
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DSNode *Node = getDSNodeFor(V);
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// Get the pool handle for this DSNode...
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std::map<DSNode*, Value*>::iterator I = FI.PoolDescriptors.find(Node);
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return I != FI.PoolDescriptors.end() ? I->second : 0;
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}
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};
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}
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void PoolAllocate::TransformFunctionBody(Function &F, DSGraph &G, FuncInfo &FI){
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FuncTransform(*this, G, FI).visit(F);
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}
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void FuncTransform::visitMallocInst(MallocInst &MI) {
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// Get the pool handle for the node that this contributes to...
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Value *PH = getPoolHandle(&MI);
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if (PH == 0) return;
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// Insert a call to poolalloc
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Value *V = new CallInst(PAInfo.PoolAlloc, make_vector(PH, 0),
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MI.getName(), &MI);
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MI.setName(""); // Nuke MIs name
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// Cast to the appropriate type...
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Value *Casted = new CastInst(V, MI.getType(), V->getName(), &MI);
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// Update def-use info
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MI.replaceAllUsesWith(Casted);
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// Remove old malloc instruction
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MI.getParent()->getInstList().erase(&MI);
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hash_map<Value*, DSNodeHandle> &SM = G.getScalarMap();
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hash_map<Value*, DSNodeHandle>::iterator MII = SM.find(&MI);
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// If we are modifying the original function, update the DSGraph...
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if (MII != SM.end()) {
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// V and Casted now point to whatever the original malloc did...
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SM.insert(std::make_pair(V, MII->second));
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SM.insert(std::make_pair(Casted, MII->second));
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SM.erase(MII); // The malloc is now destroyed
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} else { // Otherwise, update the NewToOldValueMap
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std::map<Value*,const Value*>::iterator MII =
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FI.NewToOldValueMap.find(&MI);
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assert(MII != FI.NewToOldValueMap.end() && "MI not found in clone?");
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FI.NewToOldValueMap.insert(std::make_pair(V, MII->second));
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FI.NewToOldValueMap.insert(std::make_pair(Casted, MII->second));
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FI.NewToOldValueMap.erase(MII);
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}
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}
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void FuncTransform::visitFreeInst(FreeInst &FI) {
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Value *Arg = FI.getOperand(0);
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Value *PH = getPoolHandle(Arg); // Get the pool handle for this DSNode...
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if (PH == 0) return;
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// Insert a cast and a call to poolfree...
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Value *Casted = new CastInst(Arg, PointerType::get(Type::SByteTy),
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Arg->getName()+".casted", &FI);
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new CallInst(PAInfo.PoolFree, make_vector(PH, Casted, 0), "", &FI);
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// Delete the now obsolete free instruction...
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FI.getParent()->getInstList().erase(&FI);
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}
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static void CalcNodeMapping(DSNode *Caller, DSNode *Callee,
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std::map<DSNode*, DSNode*> &NodeMapping) {
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if (Callee == 0) return;
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assert(Caller && "Callee has node but caller doesn't??");
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std::map<DSNode*, DSNode*>::iterator I = NodeMapping.find(Callee);
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if (I != NodeMapping.end()) { // Node already in map...
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assert(I->second == Caller && "Node maps to different nodes on paths?");
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} else {
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NodeMapping.insert(I, std::make_pair(Callee, Caller));
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// Recursively add pointed to nodes...
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for (unsigned i = 0, e = Callee->getNumLinks(); i != e; ++i)
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CalcNodeMapping(Caller->getLink(i << DS::PointerShift).getNode(),
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Callee->getLink(i << DS::PointerShift).getNode(),
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NodeMapping);
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}
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}
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void FuncTransform::visitCallInst(CallInst &CI) {
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Function *CF = CI.getCalledFunction();
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assert(CF && "FIXME: Pool allocation doesn't handle indirect calls!");
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FuncInfo *CFI = PAInfo.getFuncInfo(*CF);
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if (CFI == 0 || CFI->Clone == 0) return; // Nothing to transform...
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DEBUG(std::cerr << " Handling call: " << CI);
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DSGraph &CG = PAInfo.getBUDataStructures().getDSGraph(*CF); // Callee graph
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// We need to figure out which local pool descriptors correspond to the pool
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// descriptor arguments passed into the function call. Calculate a mapping
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// from callee DSNodes to caller DSNodes. We construct a partial isomophism
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// between the graphs to figure out which pool descriptors need to be passed
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// in. The roots of this mapping is found from arguments and return values.
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//
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std::map<DSNode*, DSNode*> NodeMapping;
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Function::aiterator AI = CF->abegin(), AE = CF->aend();
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unsigned OpNum = 1;
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for (; AI != AE; ++AI, ++OpNum)
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CalcNodeMapping(getDSNodeFor(CI.getOperand(OpNum)),
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CG.getScalarMap()[AI].getNode(), NodeMapping);
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assert(OpNum == CI.getNumOperands() && "Varargs calls not handled yet!");
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// Map the return value as well...
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CalcNodeMapping(getDSNodeFor(&CI), CG.getRetNode().getNode(), NodeMapping);
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// Okay, now that we have established our mapping, we can figure out which
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// pool descriptors to pass in...
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std::vector<Value*> Args;
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// Add an argument for each pool which must be passed in...
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for (unsigned i = 0, e = CFI->ArgNodes.size(); i != e; ++i) {
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if (NodeMapping.count(CFI->ArgNodes[i])) {
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assert(NodeMapping.count(CFI->ArgNodes[i]) && "Node not in mapping!");
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DSNode *LocalNode = NodeMapping.find(CFI->ArgNodes[i])->second;
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assert(FI.PoolDescriptors.count(LocalNode) && "Node not pool allocated?");
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Args.push_back(FI.PoolDescriptors.find(LocalNode)->second);
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} else {
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Args.push_back(Constant::getNullValue(PoolDescPtr));
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}
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}
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// Add the rest of the arguments...
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Args.insert(Args.end(), CI.op_begin()+1, CI.op_end());
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std::string Name = CI.getName(); CI.setName("");
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Value *NewCall = new CallInst(CFI->Clone, Args, Name, &CI);
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CI.replaceAllUsesWith(NewCall);
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DEBUG(std::cerr << " Result Call: " << *NewCall);
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CI.getParent()->getInstList().erase(&CI);
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}
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