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Add support for finding the dependencies of call and invoke instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38497 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -18,6 +18,7 @@
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#define LLVM_ANALYSIS_MEMORY_DEPENDENCE_H
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#include "llvm/Pass.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/Compiler.h"
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#include <map>
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@ -34,6 +35,7 @@ class MemoryDependenceAnalysis : public FunctionPass {
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DenseMap<Instruction*, std::pair<Instruction*, bool> > depGraphLocal;
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std::multimap<Instruction*, Instruction*> reverseDep;
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Instruction* getCallSiteDependency(CallSite C, bool local = true);
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public:
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static Instruction* NonLocal;
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@ -40,6 +40,61 @@ void MemoryDependenceAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredTransitive<TargetData>();
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}
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// Find the dependency of a CallSite
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Instruction* MemoryDependenceAnalysis::getCallSiteDependency(CallSite C, bool local) {
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assert(local && "Non-local memory dependence analysis not yet implemented");
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AliasAnalysis& AA = getAnalysis<AliasAnalysis>();
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TargetData& TD = getAnalysis<TargetData>();
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BasicBlock::iterator blockBegin = C.getInstruction()->getParent()->begin();
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BasicBlock::iterator QI = C.getInstruction();
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while (QI != blockBegin) {
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--QI;
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// If this inst is a memory op, get the pointer it accessed
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Value* pointer = 0;
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uint64_t pointerSize = 0;
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if (StoreInst* S = dyn_cast<StoreInst>(QI)) {
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pointer = S->getPointerOperand();
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pointerSize = TD.getTypeSize(S->getOperand(0)->getType());
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} else if (LoadInst* L = dyn_cast<LoadInst>(QI)) {
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pointer = L->getPointerOperand();
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pointerSize = TD.getTypeSize(L->getType());
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} else if (AllocationInst* AI = dyn_cast<AllocationInst>(QI)) {
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pointer = AI;
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if (ConstantInt* C = dyn_cast<ConstantInt>(AI->getArraySize()))
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pointerSize = C->getZExtValue();
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else
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pointerSize = ~0UL;
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} else if (FreeInst* F = dyn_cast<FreeInst>(QI)) {
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pointer = F->getPointerOperand();
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// FreeInsts erase the entire structure
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pointerSize = ~0UL;
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} else if (CallSite::get(QI).getInstruction() != 0) {
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if (AA.getModRefInfo(C, CallSite::get(QI)) != AliasAnalysis::NoModRef) {
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depGraphLocal.insert(std::make_pair(C.getInstruction(), std::make_pair(QI, true)));
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reverseDep.insert(std::make_pair(QI, C.getInstruction()));
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return QI;
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} else {
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continue;
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}
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}
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if (AA.getModRefInfo(C, pointer, pointerSize) != AliasAnalysis::NoModRef) {
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depGraphLocal.insert(std::make_pair(C.getInstruction(), std::make_pair(QI, true)));
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reverseDep.insert(std::make_pair(QI, C.getInstruction()));
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return QI;
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}
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}
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// No dependence found
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depGraphLocal.insert(std::make_pair(C.getInstruction(), std::make_pair(NonLocal, true)));
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reverseDep.insert(std::make_pair(NonLocal, C.getInstruction()));
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return NonLocal;
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}
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/// getDependency - Return the instruction on which a memory operation
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/// depends. The local paramter indicates if the query should only
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/// evaluate dependencies within the same basic block.
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@ -77,13 +132,13 @@ Instruction* MemoryDependenceAnalysis::getDependency(Instruction* query,
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// FreeInsts erase the entire structure, not just a field
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dependeeSize = ~0UL;
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} else if (isa<AllocationInst>(query))
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} else if (CallSite::get(QI).getInstruction() != 0)
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return getCallSiteDependency(CallSite::get(QI));
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else if (isa<AllocationInst>(query))
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return None;
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else
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// FIXME: Call/InvokeInsts need proper handling
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return None;
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BasicBlock::iterator blockBegin = query->getParent()->begin();
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while (QI != blockBegin) {
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@ -109,21 +164,13 @@ Instruction* MemoryDependenceAnalysis::getDependency(Instruction* query,
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// FreeInsts erase the entire structure
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pointerSize = ~0UL;
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} else if (CallInst* C = dyn_cast<CallInst>(QI)) {
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} else if (CallSite::get(QI).getInstruction() != 0) {
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// Call insts need special handling. Check is they can modify our pointer
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if (AA.getModRefInfo(C, dependee, dependeeSize) != AliasAnalysis::NoModRef) {
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depGraphLocal.insert(std::make_pair(query, std::make_pair(C, true)));
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reverseDep.insert(std::make_pair(C, query));
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return C;
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} else {
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continue;
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}
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} else if (InvokeInst* I = dyn_cast<InvokeInst>(QI)) {
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// Invoke insts need special handling. Check is they can modify our pointer
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if (AA.getModRefInfo(I, dependee, dependeeSize) != AliasAnalysis::NoModRef) {
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depGraphLocal.insert(std::make_pair(query, std::make_pair(I, true)));
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reverseDep.insert(std::make_pair(I, query));
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return I;
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if (AA.getModRefInfo(CallSite::get(QI), dependee, dependeeSize) !=
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AliasAnalysis::NoModRef) {
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depGraphLocal.insert(std::make_pair(query, std::make_pair(QI, true)));
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reverseDep.insert(std::make_pair(QI, query));
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return QI;
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} else {
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continue;
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}
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