mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27970 91177308-0d34-0410-b5e6-96231b3b80d8
1296 lines
50 KiB
C++
1296 lines
50 KiB
C++
//===- Local.cpp - Compute a local data structure graph for a function ----===//
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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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// Compute the local version of the data structure graph for a function. The
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// external interface to this file is the DSGraph constructor.
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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/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/Support/InstVisitor.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Timer.h"
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#include <iostream>
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// FIXME: This should eventually be a FunctionPass that is automatically
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// aggregated into a Pass.
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//
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#include "llvm/Module.h"
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using namespace llvm;
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static RegisterAnalysis<LocalDataStructures>
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X("datastructure", "Local Data Structure Analysis");
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static cl::opt<bool>
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TrackIntegersAsPointers("dsa-track-integers", cl::Hidden,
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cl::desc("If this is set, track integers as potential pointers"));
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static cl::list<std::string>
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AllocList("dsa-alloc-list",
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cl::value_desc("list"),
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cl::desc("List of functions that allocate memory from the heap"),
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cl::CommaSeparated, cl::Hidden);
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static cl::list<std::string>
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FreeList("dsa-free-list",
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cl::value_desc("list"),
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cl::desc("List of functions that free memory from the heap"),
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cl::CommaSeparated, cl::Hidden);
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namespace llvm {
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namespace DS {
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// isPointerType - Return true if this type is big enough to hold a pointer.
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bool isPointerType(const Type *Ty) {
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if (isa<PointerType>(Ty))
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return true;
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else if (TrackIntegersAsPointers && Ty->isPrimitiveType() &&Ty->isInteger())
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return Ty->getPrimitiveSize() >= PointerSize;
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return false;
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}
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}}
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using namespace DS;
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namespace {
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cl::opt<bool>
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DisableDirectCallOpt("disable-direct-call-dsopt", cl::Hidden,
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cl::desc("Disable direct call optimization in "
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"DSGraph construction"));
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cl::opt<bool>
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DisableFieldSensitivity("disable-ds-field-sensitivity", cl::Hidden,
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cl::desc("Disable field sensitivity in DSGraphs"));
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//===--------------------------------------------------------------------===//
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// GraphBuilder Class
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//===--------------------------------------------------------------------===//
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//
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/// This class is the builder class that constructs the local data structure
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/// graph by performing a single pass over the function in question.
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///
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class GraphBuilder : InstVisitor<GraphBuilder> {
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DSGraph &G;
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DSNodeHandle *RetNode; // Node that gets returned...
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DSScalarMap &ScalarMap;
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std::list<DSCallSite> *FunctionCalls;
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public:
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GraphBuilder(Function &f, DSGraph &g, DSNodeHandle &retNode,
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std::list<DSCallSite> &fc)
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: G(g), RetNode(&retNode), ScalarMap(G.getScalarMap()),
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FunctionCalls(&fc) {
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// Create scalar nodes for all pointer arguments...
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for (Function::arg_iterator I = f.arg_begin(), E = f.arg_end();
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I != E; ++I)
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if (isPointerType(I->getType()))
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getValueDest(*I);
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visit(f); // Single pass over the function
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}
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// GraphBuilder ctor for working on the globals graph
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GraphBuilder(DSGraph &g)
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: G(g), RetNode(0), ScalarMap(G.getScalarMap()), FunctionCalls(0) {
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}
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void mergeInGlobalInitializer(GlobalVariable *GV);
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private:
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// Visitor functions, used to handle each instruction type we encounter...
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friend class InstVisitor<GraphBuilder>;
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void visitMallocInst(MallocInst &MI) { handleAlloc(MI, true); }
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void visitAllocaInst(AllocaInst &AI) { handleAlloc(AI, false); }
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void handleAlloc(AllocationInst &AI, bool isHeap);
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void visitPHINode(PHINode &PN);
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void visitSelectInst(SelectInst &SI);
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void visitGetElementPtrInst(User &GEP);
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void visitReturnInst(ReturnInst &RI);
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void visitLoadInst(LoadInst &LI);
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void visitStoreInst(StoreInst &SI);
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void visitCallInst(CallInst &CI);
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void visitInvokeInst(InvokeInst &II);
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void visitSetCondInst(SetCondInst &SCI);
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void visitFreeInst(FreeInst &FI);
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void visitCastInst(CastInst &CI);
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void visitInstruction(Instruction &I);
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void visitCallSite(CallSite CS);
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void visitVAArgInst(VAArgInst &I);
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void MergeConstantInitIntoNode(DSNodeHandle &NH, Constant *C);
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private:
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// Helper functions used to implement the visitation functions...
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/// createNode - Create a new DSNode, ensuring that it is properly added to
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/// the graph.
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///
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DSNode *createNode(const Type *Ty = 0) {
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DSNode *N = new DSNode(Ty, &G); // Create the node
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if (DisableFieldSensitivity) {
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// Create node handle referring to the old node so that it is
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// immediately removed from the graph when the node handle is destroyed.
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DSNodeHandle OldNNH = N;
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N->foldNodeCompletely();
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if (DSNode *FN = N->getForwardNode())
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N = FN;
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}
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return N;
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}
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/// setDestTo - Set the ScalarMap entry for the specified value to point to
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/// the specified destination. If the Value already points to a node, make
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/// sure to merge the two destinations together.
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///
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void setDestTo(Value &V, const DSNodeHandle &NH);
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/// getValueDest - Return the DSNode that the actual value points to.
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///
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DSNodeHandle getValueDest(Value &V);
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/// getLink - This method is used to return the specified link in the
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/// specified node if one exists. If a link does not already exist (it's
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/// null), then we create a new node, link it, then return it.
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///
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DSNodeHandle &getLink(const DSNodeHandle &Node, unsigned Link = 0);
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};
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}
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using namespace DS;
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//===----------------------------------------------------------------------===//
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// DSGraph constructor - Simply use the GraphBuilder to construct the local
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// graph.
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DSGraph::DSGraph(EquivalenceClasses<GlobalValue*> &ECs, const TargetData &td,
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Function &F, DSGraph *GG)
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: GlobalsGraph(GG), ScalarMap(ECs), TD(td) {
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PrintAuxCalls = false;
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DEBUG(std::cerr << " [Loc] Calculating graph for: " << F.getName() << "\n");
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// Use the graph builder to construct the local version of the graph
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GraphBuilder B(F, *this, ReturnNodes[&F], FunctionCalls);
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#ifndef NDEBUG
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Timer::addPeakMemoryMeasurement();
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#endif
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// If there are any constant globals referenced in this function, merge their
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// initializers into the local graph from the globals graph.
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if (ScalarMap.global_begin() != ScalarMap.global_end()) {
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ReachabilityCloner RC(*this, *GG, 0);
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for (DSScalarMap::global_iterator I = ScalarMap.global_begin();
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I != ScalarMap.global_end(); ++I)
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(*I))
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if (!GV->isExternal() && GV->isConstant())
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RC.merge(ScalarMap[GV], GG->ScalarMap[GV]);
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}
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markIncompleteNodes(DSGraph::MarkFormalArgs);
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// Remove any nodes made dead due to merging...
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removeDeadNodes(DSGraph::KeepUnreachableGlobals);
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}
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//===----------------------------------------------------------------------===//
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// Helper method implementations...
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//
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/// getValueDest - Return the DSNode that the actual value points to.
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///
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DSNodeHandle GraphBuilder::getValueDest(Value &Val) {
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Value *V = &Val;
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if (isa<Constant>(V) && cast<Constant>(V)->isNullValue())
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return 0; // Null doesn't point to anything, don't add to ScalarMap!
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DSNodeHandle &NH = ScalarMap[V];
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if (!NH.isNull())
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return NH; // Already have a node? Just return it...
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// Otherwise we need to create a new node to point to.
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// Check first for constant expressions that must be traversed to
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// extract the actual value.
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DSNode* N;
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if (GlobalValue* GV = dyn_cast<GlobalValue>(V)) {
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// Create a new global node for this global variable.
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N = createNode(GV->getType()->getElementType());
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N->addGlobal(GV);
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} else if (Constant *C = dyn_cast<Constant>(V)) {
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
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if (CE->getOpcode() == Instruction::Cast) {
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if (isa<PointerType>(CE->getOperand(0)->getType()))
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NH = getValueDest(*CE->getOperand(0));
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else
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NH = createNode()->setUnknownNodeMarker();
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} else if (CE->getOpcode() == Instruction::GetElementPtr) {
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visitGetElementPtrInst(*CE);
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DSScalarMap::iterator I = ScalarMap.find(CE);
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assert(I != ScalarMap.end() && "GEP didn't get processed right?");
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NH = I->second;
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} else {
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// This returns a conservative unknown node for any unhandled ConstExpr
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return NH = createNode()->setUnknownNodeMarker();
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}
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if (NH.isNull()) { // (getelementptr null, X) returns null
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ScalarMap.erase(V);
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return 0;
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}
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return NH;
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} else if (isa<UndefValue>(C)) {
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ScalarMap.erase(V);
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return 0;
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} else {
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assert(0 && "Unknown constant type!");
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}
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N = createNode(); // just create a shadow node
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} else {
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// Otherwise just create a shadow node
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N = createNode();
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}
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NH.setTo(N, 0); // Remember that we are pointing to it...
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return NH;
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}
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/// getLink - This method is used to return the specified link in the
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/// specified node if one exists. If a link does not already exist (it's
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/// null), then we create a new node, link it, then return it. We must
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/// specify the type of the Node field we are accessing so that we know what
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/// type should be linked to if we need to create a new node.
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///
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DSNodeHandle &GraphBuilder::getLink(const DSNodeHandle &node, unsigned LinkNo) {
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DSNodeHandle &Node = const_cast<DSNodeHandle&>(node);
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DSNodeHandle &Link = Node.getLink(LinkNo);
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if (Link.isNull()) {
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// If the link hasn't been created yet, make and return a new shadow node
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Link = createNode();
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}
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return Link;
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}
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/// setDestTo - Set the ScalarMap entry for the specified value to point to the
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/// specified destination. If the Value already points to a node, make sure to
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/// merge the two destinations together.
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///
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void GraphBuilder::setDestTo(Value &V, const DSNodeHandle &NH) {
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ScalarMap[&V].mergeWith(NH);
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}
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//===----------------------------------------------------------------------===//
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// Specific instruction type handler implementations...
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//
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/// Alloca & Malloc instruction implementation - Simply create a new memory
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/// object, pointing the scalar to it.
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///
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void GraphBuilder::handleAlloc(AllocationInst &AI, bool isHeap) {
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DSNode *N = createNode();
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if (isHeap)
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N->setHeapNodeMarker();
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else
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N->setAllocaNodeMarker();
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setDestTo(AI, N);
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}
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// PHINode - Make the scalar for the PHI node point to all of the things the
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// incoming values point to... which effectively causes them to be merged.
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//
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void GraphBuilder::visitPHINode(PHINode &PN) {
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if (!isPointerType(PN.getType())) return; // Only pointer PHIs
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DSNodeHandle &PNDest = ScalarMap[&PN];
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for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i)
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PNDest.mergeWith(getValueDest(*PN.getIncomingValue(i)));
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}
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void GraphBuilder::visitSelectInst(SelectInst &SI) {
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if (!isPointerType(SI.getType())) return; // Only pointer Selects
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DSNodeHandle &Dest = ScalarMap[&SI];
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Dest.mergeWith(getValueDest(*SI.getOperand(1)));
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Dest.mergeWith(getValueDest(*SI.getOperand(2)));
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}
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void GraphBuilder::visitSetCondInst(SetCondInst &SCI) {
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if (!isPointerType(SCI.getOperand(0)->getType()) ||
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isa<ConstantPointerNull>(SCI.getOperand(1))) return; // Only pointers
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ScalarMap[SCI.getOperand(0)].mergeWith(getValueDest(*SCI.getOperand(1)));
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}
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void GraphBuilder::visitGetElementPtrInst(User &GEP) {
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DSNodeHandle Value = getValueDest(*GEP.getOperand(0));
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if (Value.isNull())
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Value = createNode();
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// As a special case, if all of the index operands of GEP are constant zeros,
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// handle this just like we handle casts (ie, don't do much).
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bool AllZeros = true;
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for (unsigned i = 1, e = GEP.getNumOperands(); i != e; ++i)
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if (GEP.getOperand(i) !=
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Constant::getNullValue(GEP.getOperand(i)->getType())) {
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AllZeros = false;
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break;
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}
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// If all of the indices are zero, the result points to the operand without
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// applying the type.
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if (AllZeros || (!Value.isNull() &&
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Value.getNode()->isNodeCompletelyFolded())) {
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setDestTo(GEP, Value);
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return;
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}
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const PointerType *PTy = cast<PointerType>(GEP.getOperand(0)->getType());
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const Type *CurTy = PTy->getElementType();
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if (Value.getNode()->mergeTypeInfo(CurTy, Value.getOffset())) {
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// If the node had to be folded... exit quickly
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setDestTo(GEP, Value); // GEP result points to folded node
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return;
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}
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const TargetData &TD = Value.getNode()->getTargetData();
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#if 0
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// Handle the pointer index specially...
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if (GEP.getNumOperands() > 1 &&
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(!isa<Constant>(GEP.getOperand(1)) ||
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!cast<Constant>(GEP.getOperand(1))->isNullValue())) {
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// If we already know this is an array being accessed, don't do anything...
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if (!TopTypeRec.isArray) {
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TopTypeRec.isArray = true;
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// If we are treating some inner field pointer as an array, fold the node
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// up because we cannot handle it right. This can come because of
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// something like this: &((&Pt->X)[1]) == &Pt->Y
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//
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if (Value.getOffset()) {
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// Value is now the pointer we want to GEP to be...
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Value.getNode()->foldNodeCompletely();
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setDestTo(GEP, Value); // GEP result points to folded node
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return;
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} else {
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// This is a pointer to the first byte of the node. Make sure that we
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// are pointing to the outter most type in the node.
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// FIXME: We need to check one more case here...
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}
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}
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}
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#endif
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// All of these subscripts are indexing INTO the elements we have...
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unsigned Offset = 0;
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for (gep_type_iterator I = gep_type_begin(GEP), E = gep_type_end(GEP);
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I != E; ++I)
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if (const StructType *STy = dyn_cast<StructType>(*I)) {
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unsigned FieldNo =
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(unsigned)cast<ConstantUInt>(I.getOperand())->getValue();
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Offset += (unsigned)TD.getStructLayout(STy)->MemberOffsets[FieldNo];
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} else if (const PointerType *PTy = dyn_cast<PointerType>(*I)) {
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if (!isa<Constant>(I.getOperand()) ||
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!cast<Constant>(I.getOperand())->isNullValue())
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Value.getNode()->setArrayMarker();
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}
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#if 0
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if (const SequentialType *STy = cast<SequentialType>(*I)) {
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CurTy = STy->getElementType();
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if (ConstantSInt *CS = dyn_cast<ConstantSInt>(GEP.getOperand(i))) {
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Offset += CS->getValue()*TD.getTypeSize(CurTy);
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} else {
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// Variable index into a node. We must merge all of the elements of the
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// sequential type here.
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if (isa<PointerType>(STy))
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std::cerr << "Pointer indexing not handled yet!\n";
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else {
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const ArrayType *ATy = cast<ArrayType>(STy);
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unsigned ElSize = TD.getTypeSize(CurTy);
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DSNode *N = Value.getNode();
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assert(N && "Value must have a node!");
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unsigned RawOffset = Offset+Value.getOffset();
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// Loop over all of the elements of the array, merging them into the
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// zeroth element.
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for (unsigned i = 1, e = ATy->getNumElements(); i != e; ++i)
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// Merge all of the byte components of this array element
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for (unsigned j = 0; j != ElSize; ++j)
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N->mergeIndexes(RawOffset+j, RawOffset+i*ElSize+j);
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}
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}
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}
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#endif
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// Add in the offset calculated...
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Value.setOffset(Value.getOffset()+Offset);
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// Check the offset
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DSNode *N = Value.getNode();
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if (N &&
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!N->isNodeCompletelyFolded() &&
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(N->getSize() != 0 || Offset != 0) &&
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!N->isForwarding()) {
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if ((Offset >= N->getSize()) || int(Offset) < 0) {
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// Accessing offsets out of node size range
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// This is seen in the "magic" struct in named (from bind), where the
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// fourth field is an array of length 0, presumably used to create struct
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// instances of different sizes
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// Collapse the node since its size is now variable
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N->foldNodeCompletely();
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}
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}
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// Value is now the pointer we want to GEP to be...
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setDestTo(GEP, Value);
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}
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void GraphBuilder::visitLoadInst(LoadInst &LI) {
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DSNodeHandle Ptr = getValueDest(*LI.getOperand(0));
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if (Ptr.isNull())
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Ptr = createNode();
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// Make that the node is read from...
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Ptr.getNode()->setReadMarker();
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// Ensure a typerecord exists...
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Ptr.getNode()->mergeTypeInfo(LI.getType(), Ptr.getOffset(), false);
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if (isPointerType(LI.getType()))
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setDestTo(LI, getLink(Ptr));
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}
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void GraphBuilder::visitStoreInst(StoreInst &SI) {
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const Type *StoredTy = SI.getOperand(0)->getType();
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DSNodeHandle Dest = getValueDest(*SI.getOperand(1));
|
|
if (Dest.isNull()) return;
|
|
|
|
// Mark that the node is written to...
|
|
Dest.getNode()->setModifiedMarker();
|
|
|
|
// Ensure a type-record exists...
|
|
Dest.getNode()->mergeTypeInfo(StoredTy, Dest.getOffset());
|
|
|
|
// Avoid adding edges from null, or processing non-"pointer" stores
|
|
if (isPointerType(StoredTy))
|
|
Dest.addEdgeTo(getValueDest(*SI.getOperand(0)));
|
|
}
|
|
|
|
void GraphBuilder::visitReturnInst(ReturnInst &RI) {
|
|
if (RI.getNumOperands() && isPointerType(RI.getOperand(0)->getType()))
|
|
RetNode->mergeWith(getValueDest(*RI.getOperand(0)));
|
|
}
|
|
|
|
void GraphBuilder::visitVAArgInst(VAArgInst &I) {
|
|
//FIXME: also updates the argument
|
|
DSNodeHandle Ptr = getValueDest(*I.getOperand(0));
|
|
if (Ptr.isNull()) return;
|
|
|
|
// Make that the node is read from.
|
|
Ptr.getNode()->setReadMarker();
|
|
|
|
// Ensure a type record exists.
|
|
DSNode *PtrN = Ptr.getNode();
|
|
PtrN->mergeTypeInfo(I.getType(), Ptr.getOffset(), false);
|
|
|
|
if (isPointerType(I.getType()))
|
|
setDestTo(I, getLink(Ptr));
|
|
}
|
|
|
|
|
|
void GraphBuilder::visitCallInst(CallInst &CI) {
|
|
visitCallSite(&CI);
|
|
}
|
|
|
|
void GraphBuilder::visitInvokeInst(InvokeInst &II) {
|
|
visitCallSite(&II);
|
|
}
|
|
|
|
void GraphBuilder::visitCallSite(CallSite CS) {
|
|
Value *Callee = CS.getCalledValue();
|
|
|
|
// Special case handling of certain libc allocation functions here.
|
|
if (Function *F = dyn_cast<Function>(Callee))
|
|
if (F->isExternal())
|
|
switch (F->getIntrinsicID()) {
|
|
case Intrinsic::vastart:
|
|
getValueDest(*CS.getInstruction()).getNode()->setAllocaNodeMarker();
|
|
return;
|
|
case Intrinsic::vacopy:
|
|
getValueDest(*CS.getInstruction()).
|
|
mergeWith(getValueDest(**(CS.arg_begin())));
|
|
return;
|
|
case Intrinsic::vaend:
|
|
return; // noop
|
|
case Intrinsic::memcpy_i32:
|
|
case Intrinsic::memcpy_i64:
|
|
case Intrinsic::memmove_i32:
|
|
case Intrinsic::memmove_i64: {
|
|
// Merge the first & second arguments, and mark the memory read and
|
|
// modified.
|
|
DSNodeHandle RetNH = getValueDest(**CS.arg_begin());
|
|
RetNH.mergeWith(getValueDest(**(CS.arg_begin()+1)));
|
|
if (DSNode *N = RetNH.getNode())
|
|
N->setModifiedMarker()->setReadMarker();
|
|
return;
|
|
}
|
|
case Intrinsic::memset_i32:
|
|
case Intrinsic::memset_i64:
|
|
// Mark the memory modified.
|
|
if (DSNode *N = getValueDest(**CS.arg_begin()).getNode())
|
|
N->setModifiedMarker();
|
|
return;
|
|
default:
|
|
// Determine if the called function is one of the specified heap
|
|
// allocation functions
|
|
for (cl::list<std::string>::iterator AllocFunc = AllocList.begin(),
|
|
LastAllocFunc = AllocList.end();
|
|
AllocFunc != LastAllocFunc;
|
|
++AllocFunc) {
|
|
if (F->getName() == *(AllocFunc)) {
|
|
setDestTo(*CS.getInstruction(),
|
|
createNode()->setHeapNodeMarker()->setModifiedMarker());
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Determine if the called function is one of the specified heap
|
|
// free functions
|
|
for (cl::list<std::string>::iterator FreeFunc = FreeList.begin(),
|
|
LastFreeFunc = FreeList.end();
|
|
FreeFunc != LastFreeFunc;
|
|
++FreeFunc) {
|
|
if (F->getName() == *(FreeFunc)) {
|
|
// Mark that the node is written to...
|
|
if (DSNode *N = getValueDest(*(CS.getArgument(0))).getNode())
|
|
N->setModifiedMarker()->setHeapNodeMarker();
|
|
return;
|
|
}
|
|
}
|
|
|
|
if ((F->isExternal() && F->getName() == "calloc")
|
|
|| F->getName() == "posix_memalign"
|
|
|| F->getName() == "memalign" || F->getName() == "valloc") {
|
|
setDestTo(*CS.getInstruction(),
|
|
createNode()->setHeapNodeMarker()->setModifiedMarker());
|
|
return;
|
|
} else if (F->getName() == "realloc") {
|
|
DSNodeHandle RetNH = getValueDest(*CS.getInstruction());
|
|
if (CS.arg_begin() != CS.arg_end())
|
|
RetNH.mergeWith(getValueDest(**CS.arg_begin()));
|
|
if (DSNode *N = RetNH.getNode())
|
|
N->setHeapNodeMarker()->setModifiedMarker()->setReadMarker();
|
|
return;
|
|
} else if (F->getName() == "memmove") {
|
|
// Merge the first & second arguments, and mark the memory read and
|
|
// modified.
|
|
DSNodeHandle RetNH = getValueDest(**CS.arg_begin());
|
|
RetNH.mergeWith(getValueDest(**(CS.arg_begin()+1)));
|
|
if (DSNode *N = RetNH.getNode())
|
|
N->setModifiedMarker()->setReadMarker();
|
|
return;
|
|
} else if (F->getName() == "free") {
|
|
// Mark that the node is written to...
|
|
if (DSNode *N = getValueDest(**CS.arg_begin()).getNode())
|
|
N->setModifiedMarker()->setHeapNodeMarker();
|
|
} else if (F->getName() == "atoi" || F->getName() == "atof" ||
|
|
F->getName() == "atol" || F->getName() == "atoll" ||
|
|
F->getName() == "remove" || F->getName() == "unlink" ||
|
|
F->getName() == "rename" || F->getName() == "memcmp" ||
|
|
F->getName() == "strcmp" || F->getName() == "strncmp" ||
|
|
F->getName() == "execl" || F->getName() == "execlp" ||
|
|
F->getName() == "execle" || F->getName() == "execv" ||
|
|
F->getName() == "execvp" || F->getName() == "chmod" ||
|
|
F->getName() == "puts" || F->getName() == "write" ||
|
|
F->getName() == "open" || F->getName() == "create" ||
|
|
F->getName() == "truncate" || F->getName() == "chdir" ||
|
|
F->getName() == "mkdir" || F->getName() == "rmdir") {
|
|
// These functions read all of their pointer operands.
|
|
for (CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
AI != E; ++AI) {
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setReadMarker();
|
|
}
|
|
return;
|
|
} else if (F->getName() == "memchr") {
|
|
DSNodeHandle RetNH = getValueDest(**CS.arg_begin());
|
|
DSNodeHandle Result = getValueDest(*CS.getInstruction());
|
|
RetNH.mergeWith(Result);
|
|
if (DSNode *N = RetNH.getNode())
|
|
N->setReadMarker();
|
|
return;
|
|
} else if (F->getName() == "read" || F->getName() == "pipe" ||
|
|
F->getName() == "wait" || F->getName() == "time") {
|
|
// These functions write all of their pointer operands.
|
|
for (CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
AI != E; ++AI) {
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setModifiedMarker();
|
|
}
|
|
return;
|
|
} else if (F->getName() == "stat" || F->getName() == "fstat" ||
|
|
F->getName() == "lstat") {
|
|
// These functions read their first operand if its a pointer.
|
|
CallSite::arg_iterator AI = CS.arg_begin();
|
|
if (isPointerType((*AI)->getType())) {
|
|
DSNodeHandle Path = getValueDest(**AI);
|
|
if (DSNode *N = Path.getNode()) N->setReadMarker();
|
|
}
|
|
|
|
// Then they write into the stat buffer.
|
|
DSNodeHandle StatBuf = getValueDest(**++AI);
|
|
if (DSNode *N = StatBuf.getNode()) {
|
|
N->setModifiedMarker();
|
|
const Type *StatTy = F->getFunctionType()->getParamType(1);
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(StatTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), StatBuf.getOffset());
|
|
}
|
|
return;
|
|
} else if (F->getName() == "strtod" || F->getName() == "strtof" ||
|
|
F->getName() == "strtold") {
|
|
// These functions read the first pointer
|
|
if (DSNode *Str = getValueDest(**CS.arg_begin()).getNode()) {
|
|
Str->setReadMarker();
|
|
// If the second parameter is passed, it will point to the first
|
|
// argument node.
|
|
const DSNodeHandle &EndPtrNH = getValueDest(**(CS.arg_begin()+1));
|
|
if (DSNode *End = EndPtrNH.getNode()) {
|
|
End->mergeTypeInfo(PointerType::get(Type::SByteTy),
|
|
EndPtrNH.getOffset(), false);
|
|
End->setModifiedMarker();
|
|
DSNodeHandle &Link = getLink(EndPtrNH);
|
|
Link.mergeWith(getValueDest(**CS.arg_begin()));
|
|
}
|
|
}
|
|
return;
|
|
} else if (F->getName() == "fopen" || F->getName() == "fdopen" ||
|
|
F->getName() == "freopen") {
|
|
// These functions read all of their pointer operands.
|
|
for (CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
AI != E; ++AI)
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setReadMarker();
|
|
|
|
// fopen allocates in an unknown way and writes to the file
|
|
// descriptor. Also, merge the allocated type into the node.
|
|
DSNodeHandle Result = getValueDest(*CS.getInstruction());
|
|
if (DSNode *N = Result.getNode()) {
|
|
N->setModifiedMarker()->setUnknownNodeMarker();
|
|
const Type *RetTy = F->getFunctionType()->getReturnType();
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(RetTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), Result.getOffset());
|
|
}
|
|
|
|
// If this is freopen, merge the file descriptor passed in with the
|
|
// result.
|
|
if (F->getName() == "freopen") {
|
|
// ICC doesn't handle getting the iterator, decrementing and
|
|
// dereferencing it in one operation without error. Do it in 2 steps
|
|
CallSite::arg_iterator compit = CS.arg_end();
|
|
Result.mergeWith(getValueDest(**--compit));
|
|
}
|
|
return;
|
|
} else if (F->getName() == "fclose" && CS.arg_end()-CS.arg_begin() ==1){
|
|
// fclose reads and deallocates the memory in an unknown way for the
|
|
// file descriptor. It merges the FILE type into the descriptor.
|
|
DSNodeHandle H = getValueDest(**CS.arg_begin());
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker()->setUnknownNodeMarker();
|
|
const Type *ArgTy = F->getFunctionType()->getParamType(0);
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
return;
|
|
} else if (CS.arg_end()-CS.arg_begin() == 1 &&
|
|
(F->getName() == "fflush" || F->getName() == "feof" ||
|
|
F->getName() == "fileno" || F->getName() == "clearerr" ||
|
|
F->getName() == "rewind" || F->getName() == "ftell" ||
|
|
F->getName() == "ferror" || F->getName() == "fgetc" ||
|
|
F->getName() == "fgetc" || F->getName() == "_IO_getc")) {
|
|
// fflush reads and writes the memory for the file descriptor. It
|
|
// merges the FILE type into the descriptor.
|
|
DSNodeHandle H = getValueDest(**CS.arg_begin());
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker()->setModifiedMarker();
|
|
|
|
const Type *ArgTy = F->getFunctionType()->getParamType(0);
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
return;
|
|
} else if (CS.arg_end()-CS.arg_begin() == 4 &&
|
|
(F->getName() == "fwrite" || F->getName() == "fread")) {
|
|
// fread writes the first operand, fwrite reads it. They both
|
|
// read/write the FILE descriptor, and merges the FILE type.
|
|
CallSite::arg_iterator compit = CS.arg_end();
|
|
DSNodeHandle H = getValueDest(**--compit);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker()->setModifiedMarker();
|
|
const Type *ArgTy = F->getFunctionType()->getParamType(3);
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
|
|
H = getValueDest(**CS.arg_begin());
|
|
if (DSNode *N = H.getNode())
|
|
if (F->getName() == "fwrite")
|
|
N->setReadMarker();
|
|
else
|
|
N->setModifiedMarker();
|
|
return;
|
|
} else if (F->getName() == "fgets" && CS.arg_end()-CS.arg_begin() == 3){
|
|
// fgets reads and writes the memory for the file descriptor. It
|
|
// merges the FILE type into the descriptor, and writes to the
|
|
// argument. It returns the argument as well.
|
|
CallSite::arg_iterator AI = CS.arg_begin();
|
|
DSNodeHandle H = getValueDest(**AI);
|
|
if (DSNode *N = H.getNode())
|
|
N->setModifiedMarker(); // Writes buffer
|
|
H.mergeWith(getValueDest(*CS.getInstruction())); // Returns buffer
|
|
++AI; ++AI;
|
|
|
|
// Reads and writes file descriptor, merge in FILE type.
|
|
H = getValueDest(**AI);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker()->setModifiedMarker();
|
|
const Type *ArgTy = F->getFunctionType()->getParamType(2);
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
return;
|
|
} else if (F->getName() == "ungetc" || F->getName() == "fputc" ||
|
|
F->getName() == "fputs" || F->getName() == "putc" ||
|
|
F->getName() == "ftell" || F->getName() == "rewind" ||
|
|
F->getName() == "_IO_putc") {
|
|
// These functions read and write the memory for the file descriptor,
|
|
// which is passes as the last argument.
|
|
CallSite::arg_iterator compit = CS.arg_end();
|
|
DSNodeHandle H = getValueDest(**--compit);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker()->setModifiedMarker();
|
|
FunctionType::param_iterator compit2 = F->getFunctionType()->param_end();
|
|
const Type *ArgTy = *--compit2;
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
|
|
// Any pointer arguments are read.
|
|
for (CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
AI != E; ++AI)
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setReadMarker();
|
|
return;
|
|
} else if (F->getName() == "fseek" || F->getName() == "fgetpos" ||
|
|
F->getName() == "fsetpos") {
|
|
// These functions read and write the memory for the file descriptor,
|
|
// and read/write all other arguments.
|
|
DSNodeHandle H = getValueDest(**CS.arg_begin());
|
|
if (DSNode *N = H.getNode()) {
|
|
FunctionType::param_iterator compit2 = F->getFunctionType()->param_end();
|
|
const Type *ArgTy = *--compit2;
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
|
|
// Any pointer arguments are read.
|
|
for (CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
AI != E; ++AI)
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setReadMarker()->setModifiedMarker();
|
|
return;
|
|
} else if (F->getName() == "printf" || F->getName() == "fprintf" ||
|
|
F->getName() == "sprintf") {
|
|
CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
|
|
if (F->getName() == "fprintf") {
|
|
// fprintf reads and writes the FILE argument, and applies the type
|
|
// to it.
|
|
DSNodeHandle H = getValueDest(**AI);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setModifiedMarker();
|
|
const Type *ArgTy = (*AI)->getType();
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
} else if (F->getName() == "sprintf") {
|
|
// sprintf writes the first string argument.
|
|
DSNodeHandle H = getValueDest(**AI++);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setModifiedMarker();
|
|
const Type *ArgTy = (*AI)->getType();
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
}
|
|
|
|
for (; AI != E; ++AI) {
|
|
// printf reads all pointer arguments.
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setReadMarker();
|
|
}
|
|
return;
|
|
} else if (F->getName() == "vprintf" || F->getName() == "vfprintf" ||
|
|
F->getName() == "vsprintf") {
|
|
CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
|
|
if (F->getName() == "vfprintf") {
|
|
// ffprintf reads and writes the FILE argument, and applies the type
|
|
// to it.
|
|
DSNodeHandle H = getValueDest(**AI);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setModifiedMarker()->setReadMarker();
|
|
const Type *ArgTy = (*AI)->getType();
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
++AI;
|
|
} else if (F->getName() == "vsprintf") {
|
|
// vsprintf writes the first string argument.
|
|
DSNodeHandle H = getValueDest(**AI++);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setModifiedMarker();
|
|
const Type *ArgTy = (*AI)->getType();
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
}
|
|
|
|
// Read the format
|
|
if (AI != E) {
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setReadMarker();
|
|
++AI;
|
|
}
|
|
|
|
// Read the valist, and the pointed-to objects.
|
|
if (AI != E && isPointerType((*AI)->getType())) {
|
|
const DSNodeHandle &VAList = getValueDest(**AI);
|
|
if (DSNode *N = VAList.getNode()) {
|
|
N->setReadMarker();
|
|
N->mergeTypeInfo(PointerType::get(Type::SByteTy),
|
|
VAList.getOffset(), false);
|
|
|
|
DSNodeHandle &VAListObjs = getLink(VAList);
|
|
VAListObjs.getNode()->setReadMarker();
|
|
}
|
|
}
|
|
|
|
return;
|
|
} else if (F->getName() == "scanf" || F->getName() == "fscanf" ||
|
|
F->getName() == "sscanf") {
|
|
CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
|
|
if (F->getName() == "fscanf") {
|
|
// fscanf reads and writes the FILE argument, and applies the type
|
|
// to it.
|
|
DSNodeHandle H = getValueDest(**AI);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker();
|
|
const Type *ArgTy = (*AI)->getType();
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
} else if (F->getName() == "sscanf") {
|
|
// sscanf reads the first string argument.
|
|
DSNodeHandle H = getValueDest(**AI++);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker();
|
|
const Type *ArgTy = (*AI)->getType();
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
}
|
|
|
|
for (; AI != E; ++AI) {
|
|
// scanf writes all pointer arguments.
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setModifiedMarker();
|
|
}
|
|
return;
|
|
} else if (F->getName() == "strtok") {
|
|
// strtok reads and writes the first argument, returning it. It reads
|
|
// its second arg. FIXME: strtok also modifies some hidden static
|
|
// data. Someday this might matter.
|
|
CallSite::arg_iterator AI = CS.arg_begin();
|
|
DSNodeHandle H = getValueDest(**AI++);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker()->setModifiedMarker(); // Reads/Writes buffer
|
|
const Type *ArgTy = F->getFunctionType()->getParamType(0);
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
H.mergeWith(getValueDest(*CS.getInstruction())); // Returns buffer
|
|
|
|
H = getValueDest(**AI); // Reads delimiter
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setReadMarker();
|
|
const Type *ArgTy = F->getFunctionType()->getParamType(1);
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
|
|
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
|
|
}
|
|
return;
|
|
} else if (F->getName() == "strchr" || F->getName() == "strrchr" ||
|
|
F->getName() == "strstr") {
|
|
// These read their arguments, and return the first one
|
|
DSNodeHandle H = getValueDest(**CS.arg_begin());
|
|
H.mergeWith(getValueDest(*CS.getInstruction())); // Returns buffer
|
|
|
|
for (CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
AI != E; ++AI)
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setReadMarker();
|
|
|
|
if (DSNode *N = H.getNode())
|
|
N->setReadMarker();
|
|
return;
|
|
} else if (F->getName() == "__assert_fail") {
|
|
for (CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
|
|
AI != E; ++AI)
|
|
if (isPointerType((*AI)->getType()))
|
|
if (DSNode *N = getValueDest(**AI).getNode())
|
|
N->setReadMarker();
|
|
return;
|
|
} else if (F->getName() == "modf" && CS.arg_end()-CS.arg_begin() == 2) {
|
|
// This writes its second argument, and forces it to double.
|
|
CallSite::arg_iterator compit = CS.arg_end();
|
|
DSNodeHandle H = getValueDest(**--compit);
|
|
if (DSNode *N = H.getNode()) {
|
|
N->setModifiedMarker();
|
|
N->mergeTypeInfo(Type::DoubleTy, H.getOffset());
|
|
}
|
|
return;
|
|
} else if (F->getName() == "strcat" || F->getName() == "strncat") {
|
|
//This might be making unsafe assumptions about usage
|
|
//Merge return and first arg
|
|
DSNodeHandle RetNH = getValueDest(*CS.getInstruction());
|
|
RetNH.mergeWith(getValueDest(**CS.arg_begin()));
|
|
if (DSNode *N = RetNH.getNode())
|
|
N->setHeapNodeMarker()->setModifiedMarker()->setReadMarker();
|
|
//and read second pointer
|
|
if (DSNode *N = getValueDest(**(CS.arg_begin() + 1)).getNode())
|
|
N->setReadMarker();
|
|
return;
|
|
} else {
|
|
// Unknown function, warn if it returns a pointer type or takes a
|
|
// pointer argument.
|
|
bool Warn = isPointerType(CS.getInstruction()->getType());
|
|
if (!Warn)
|
|
for (CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end();
|
|
I != E; ++I)
|
|
if (isPointerType((*I)->getType())) {
|
|
Warn = true;
|
|
break;
|
|
}
|
|
if (Warn)
|
|
std::cerr << "WARNING: Call to unknown external function '"
|
|
<< F->getName() << "' will cause pessimistic results!\n";
|
|
}
|
|
}
|
|
|
|
|
|
// Set up the return value...
|
|
DSNodeHandle RetVal;
|
|
Instruction *I = CS.getInstruction();
|
|
if (isPointerType(I->getType()))
|
|
RetVal = getValueDest(*I);
|
|
|
|
DSNode *CalleeNode = 0;
|
|
if (DisableDirectCallOpt || !isa<Function>(Callee)) {
|
|
CalleeNode = getValueDest(*Callee).getNode();
|
|
if (CalleeNode == 0) {
|
|
std::cerr << "WARNING: Program is calling through a null pointer?\n"<< *I;
|
|
return; // Calling a null pointer?
|
|
}
|
|
}
|
|
|
|
std::vector<DSNodeHandle> Args;
|
|
Args.reserve(CS.arg_end()-CS.arg_begin());
|
|
|
|
// Calculate the arguments vector...
|
|
for (CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end(); I != E; ++I)
|
|
if (isPointerType((*I)->getType()))
|
|
Args.push_back(getValueDest(**I));
|
|
|
|
// Add a new function call entry...
|
|
if (CalleeNode)
|
|
FunctionCalls->push_back(DSCallSite(CS, RetVal, CalleeNode, Args));
|
|
else
|
|
FunctionCalls->push_back(DSCallSite(CS, RetVal, cast<Function>(Callee),
|
|
Args));
|
|
}
|
|
|
|
void GraphBuilder::visitFreeInst(FreeInst &FI) {
|
|
// Mark that the node is written to...
|
|
if (DSNode *N = getValueDest(*FI.getOperand(0)).getNode())
|
|
N->setModifiedMarker()->setHeapNodeMarker();
|
|
}
|
|
|
|
/// Handle casts...
|
|
void GraphBuilder::visitCastInst(CastInst &CI) {
|
|
if (isPointerType(CI.getType()))
|
|
if (isPointerType(CI.getOperand(0)->getType())) {
|
|
DSNodeHandle Ptr = getValueDest(*CI.getOperand(0));
|
|
if (Ptr.getNode() == 0) return;
|
|
|
|
// Cast one pointer to the other, just act like a copy instruction
|
|
setDestTo(CI, Ptr);
|
|
} else {
|
|
// Cast something (floating point, small integer) to a pointer. We need
|
|
// to track the fact that the node points to SOMETHING, just something we
|
|
// don't know about. Make an "Unknown" node.
|
|
//
|
|
setDestTo(CI, createNode()->setUnknownNodeMarker());
|
|
}
|
|
}
|
|
|
|
|
|
// visitInstruction - For all other instruction types, if we have any arguments
|
|
// that are of pointer type, make them have unknown composition bits, and merge
|
|
// the nodes together.
|
|
void GraphBuilder::visitInstruction(Instruction &Inst) {
|
|
DSNodeHandle CurNode;
|
|
if (isPointerType(Inst.getType()))
|
|
CurNode = getValueDest(Inst);
|
|
for (User::op_iterator I = Inst.op_begin(), E = Inst.op_end(); I != E; ++I)
|
|
if (isPointerType((*I)->getType()))
|
|
CurNode.mergeWith(getValueDest(**I));
|
|
|
|
if (DSNode *N = CurNode.getNode())
|
|
N->setUnknownNodeMarker();
|
|
}
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// LocalDataStructures Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// MergeConstantInitIntoNode - Merge the specified constant into the node
|
|
// pointed to by NH.
|
|
void GraphBuilder::MergeConstantInitIntoNode(DSNodeHandle &NH, Constant *C) {
|
|
// Ensure a type-record exists...
|
|
DSNode *NHN = NH.getNode();
|
|
NHN->mergeTypeInfo(C->getType(), NH.getOffset());
|
|
|
|
if (C->getType()->isFirstClassType()) {
|
|
if (isPointerType(C->getType()))
|
|
// Avoid adding edges from null, or processing non-"pointer" stores
|
|
NH.addEdgeTo(getValueDest(*C));
|
|
return;
|
|
}
|
|
|
|
const TargetData &TD = NH.getNode()->getTargetData();
|
|
|
|
if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
|
|
for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
|
|
// We don't currently do any indexing for arrays...
|
|
MergeConstantInitIntoNode(NH, cast<Constant>(CA->getOperand(i)));
|
|
} else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
|
|
const StructLayout *SL = TD.getStructLayout(CS->getType());
|
|
for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
|
|
DSNode *NHN = NH.getNode();
|
|
//Some programmers think ending a structure with a [0 x sbyte] is cute
|
|
if (SL->MemberOffsets[i] < SL->StructSize) {
|
|
DSNodeHandle NewNH(NHN, NH.getOffset()+(unsigned)SL->MemberOffsets[i]);
|
|
MergeConstantInitIntoNode(NewNH, cast<Constant>(CS->getOperand(i)));
|
|
} else if (SL->MemberOffsets[i] == SL->StructSize) {
|
|
DEBUG(std::cerr << "Zero size element at end of struct\n");
|
|
NHN->foldNodeCompletely();
|
|
} else {
|
|
assert(0 && "type was smaller than offsets of of struct layout indicate");
|
|
}
|
|
}
|
|
} else if (isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) {
|
|
// Noop
|
|
} else {
|
|
assert(0 && "Unknown constant type!");
|
|
}
|
|
}
|
|
|
|
void GraphBuilder::mergeInGlobalInitializer(GlobalVariable *GV) {
|
|
assert(!GV->isExternal() && "Cannot merge in external global!");
|
|
// Get a node handle to the global node and merge the initializer into it.
|
|
DSNodeHandle NH = getValueDest(*GV);
|
|
MergeConstantInitIntoNode(NH, GV->getInitializer());
|
|
}
|
|
|
|
|
|
/// BuildGlobalECs - Look at all of the nodes in the globals graph. If any node
|
|
/// contains multiple globals, DSA will never, ever, be able to tell the globals
|
|
/// apart. Instead of maintaining this information in all of the graphs
|
|
/// throughout the entire program, store only a single global (the "leader") in
|
|
/// the graphs, and build equivalence classes for the rest of the globals.
|
|
static void BuildGlobalECs(DSGraph &GG, std::set<GlobalValue*> &ECGlobals) {
|
|
DSScalarMap &SM = GG.getScalarMap();
|
|
EquivalenceClasses<GlobalValue*> &GlobalECs = SM.getGlobalECs();
|
|
for (DSGraph::node_iterator I = GG.node_begin(), E = GG.node_end();
|
|
I != E; ++I) {
|
|
if (I->getGlobalsList().size() <= 1) continue;
|
|
|
|
// First, build up the equivalence set for this block of globals.
|
|
const std::vector<GlobalValue*> &GVs = I->getGlobalsList();
|
|
GlobalValue *First = GVs[0];
|
|
for (unsigned i = 1, e = GVs.size(); i != e; ++i)
|
|
GlobalECs.unionSets(First, GVs[i]);
|
|
|
|
// Next, get the leader element.
|
|
assert(First == GlobalECs.getLeaderValue(First) &&
|
|
"First did not end up being the leader?");
|
|
|
|
// Next, remove all globals from the scalar map that are not the leader.
|
|
assert(GVs[0] == First && "First had to be at the front!");
|
|
for (unsigned i = 1, e = GVs.size(); i != e; ++i) {
|
|
ECGlobals.insert(GVs[i]);
|
|
SM.erase(SM.find(GVs[i]));
|
|
}
|
|
|
|
// Finally, change the global node to only contain the leader.
|
|
I->clearGlobals();
|
|
I->addGlobal(First);
|
|
}
|
|
|
|
DEBUG(GG.AssertGraphOK());
|
|
}
|
|
|
|
/// EliminateUsesOfECGlobals - Once we have determined that some globals are in
|
|
/// really just equivalent to some other globals, remove the globals from the
|
|
/// specified DSGraph (if present), and merge any nodes with their leader nodes.
|
|
static void EliminateUsesOfECGlobals(DSGraph &G,
|
|
const std::set<GlobalValue*> &ECGlobals) {
|
|
DSScalarMap &SM = G.getScalarMap();
|
|
EquivalenceClasses<GlobalValue*> &GlobalECs = SM.getGlobalECs();
|
|
|
|
bool MadeChange = false;
|
|
for (DSScalarMap::global_iterator GI = SM.global_begin(), E = SM.global_end();
|
|
GI != E; ) {
|
|
GlobalValue *GV = *GI++;
|
|
if (!ECGlobals.count(GV)) continue;
|
|
|
|
const DSNodeHandle &GVNH = SM[GV];
|
|
assert(!GVNH.isNull() && "Global has null NH!?");
|
|
|
|
// Okay, this global is in some equivalence class. Start by finding the
|
|
// leader of the class.
|
|
GlobalValue *Leader = GlobalECs.getLeaderValue(GV);
|
|
|
|
// If the leader isn't already in the graph, insert it into the node
|
|
// corresponding to GV.
|
|
if (!SM.global_count(Leader)) {
|
|
GVNH.getNode()->addGlobal(Leader);
|
|
SM[Leader] = GVNH;
|
|
} else {
|
|
// Otherwise, the leader is in the graph, make sure the nodes are the
|
|
// merged in the specified graph.
|
|
const DSNodeHandle &LNH = SM[Leader];
|
|
if (LNH.getNode() != GVNH.getNode())
|
|
LNH.mergeWith(GVNH);
|
|
}
|
|
|
|
// Next step, remove the global from the DSNode.
|
|
GVNH.getNode()->removeGlobal(GV);
|
|
|
|
// Finally, remove the global from the ScalarMap.
|
|
SM.erase(GV);
|
|
MadeChange = true;
|
|
}
|
|
|
|
DEBUG(if(MadeChange) G.AssertGraphOK());
|
|
}
|
|
|
|
bool LocalDataStructures::runOnModule(Module &M) {
|
|
const TargetData &TD = getAnalysis<TargetData>();
|
|
|
|
// First step, build the globals graph.
|
|
GlobalsGraph = new DSGraph(GlobalECs, TD);
|
|
{
|
|
GraphBuilder GGB(*GlobalsGraph);
|
|
|
|
// Add initializers for all of the globals to the globals graph.
|
|
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
|
|
I != E; ++I)
|
|
if (!I->isExternal())
|
|
GGB.mergeInGlobalInitializer(I);
|
|
}
|
|
|
|
// Next step, iterate through the nodes in the globals graph, unioning
|
|
// together the globals into equivalence classes.
|
|
std::set<GlobalValue*> ECGlobals;
|
|
BuildGlobalECs(*GlobalsGraph, ECGlobals);
|
|
DEBUG(std::cerr << "Eliminating " << ECGlobals.size() << " EC Globals!\n");
|
|
ECGlobals.clear();
|
|
|
|
// Calculate all of the graphs...
|
|
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
|
|
if (!I->isExternal())
|
|
DSInfo.insert(std::make_pair(I, new DSGraph(GlobalECs, TD, *I,
|
|
GlobalsGraph)));
|
|
|
|
GlobalsGraph->removeTriviallyDeadNodes();
|
|
GlobalsGraph->markIncompleteNodes(DSGraph::MarkFormalArgs);
|
|
|
|
// Now that we've computed all of the graphs, and merged all of the info into
|
|
// the globals graph, see if we have further constrained the globals in the
|
|
// program if so, update GlobalECs and remove the extraneous globals from the
|
|
// program.
|
|
BuildGlobalECs(*GlobalsGraph, ECGlobals);
|
|
if (!ECGlobals.empty()) {
|
|
DEBUG(std::cerr << "Eliminating " << ECGlobals.size() << " EC Globals!\n");
|
|
for (hash_map<Function*, DSGraph*>::iterator I = DSInfo.begin(),
|
|
E = DSInfo.end(); I != E; ++I)
|
|
EliminateUsesOfECGlobals(*I->second, ECGlobals);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// releaseMemory - If the pass pipeline is done with this pass, we can release
|
|
// our memory... here...
|
|
//
|
|
void LocalDataStructures::releaseMemory() {
|
|
for (hash_map<Function*, DSGraph*>::iterator I = DSInfo.begin(),
|
|
E = DSInfo.end(); I != E; ++I) {
|
|
I->second->getReturnNodes().erase(I->first);
|
|
if (I->second->getReturnNodes().empty())
|
|
delete I->second;
|
|
}
|
|
|
|
// Empty map so next time memory is released, data structures are not
|
|
// re-deleted.
|
|
DSInfo.clear();
|
|
delete GlobalsGraph;
|
|
GlobalsGraph = 0;
|
|
}
|
|
|