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authorpatrick <patrick@openbsd.org>2020-08-03 15:06:44 +0000
committerpatrick <patrick@openbsd.org>2020-08-03 15:06:44 +0000
commitb64793999546ed8adebaeebd9d8345d18db8927d (patch)
tree4357c27b561d73b0e089727c6ed659f2ceff5f47 /gnu/llvm/lib/Analysis/CFLGraph.h
parentAdd support for UTF-8 DISPLAY-HINTs with octet length. For now only (diff)
downloadwireguard-openbsd-b64793999546ed8adebaeebd9d8345d18db8927d.tar.xz
wireguard-openbsd-b64793999546ed8adebaeebd9d8345d18db8927d.zip
Remove LLVM 8.0.1 files.
Diffstat (limited to 'gnu/llvm/lib/Analysis/CFLGraph.h')
-rw-r--r--gnu/llvm/lib/Analysis/CFLGraph.h654
1 files changed, 0 insertions, 654 deletions
diff --git a/gnu/llvm/lib/Analysis/CFLGraph.h b/gnu/llvm/lib/Analysis/CFLGraph.h
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--- a/gnu/llvm/lib/Analysis/CFLGraph.h
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@@ -1,654 +0,0 @@
-//===- CFLGraph.h - Abstract stratified sets implementation. -----*- C++-*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-/// \file
-/// This file defines CFLGraph, an auxiliary data structure used by CFL-based
-/// alias analysis.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_LIB_ANALYSIS_CFLGRAPH_H
-#define LLVM_LIB_ANALYSIS_CFLGRAPH_H
-
-#include "AliasAnalysisSummary.h"
-#include "llvm/ADT/APInt.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/iterator_range.h"
-#include "llvm/Analysis/MemoryBuiltins.h"
-#include "llvm/Analysis/TargetLibraryInfo.h"
-#include "llvm/IR/Argument.h"
-#include "llvm/IR/BasicBlock.h"
-#include "llvm/IR/CallSite.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/GlobalValue.h"
-#include "llvm/IR/InstVisitor.h"
-#include "llvm/IR/InstrTypes.h"
-#include "llvm/IR/Instruction.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Operator.h"
-#include "llvm/IR/Type.h"
-#include "llvm/IR/Value.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/ErrorHandling.h"
-#include <cassert>
-#include <cstdint>
-#include <vector>
-
-namespace llvm {
-namespace cflaa {
-
-/// The Program Expression Graph (PEG) of CFL analysis
-/// CFLGraph is auxiliary data structure used by CFL-based alias analysis to
-/// describe flow-insensitive pointer-related behaviors. Given an LLVM function,
-/// the main purpose of this graph is to abstract away unrelated facts and
-/// translate the rest into a form that can be easily digested by CFL analyses.
-/// Each Node in the graph is an InstantiatedValue, and each edge represent a
-/// pointer assignment between InstantiatedValue. Pointer
-/// references/dereferences are not explicitly stored in the graph: we
-/// implicitly assume that for each node (X, I) it has a dereference edge to (X,
-/// I+1) and a reference edge to (X, I-1).
-class CFLGraph {
-public:
- using Node = InstantiatedValue;
-
- struct Edge {
- Node Other;
- int64_t Offset;
- };
-
- using EdgeList = std::vector<Edge>;
-
- struct NodeInfo {
- EdgeList Edges, ReverseEdges;
- AliasAttrs Attr;
- };
-
- class ValueInfo {
- std::vector<NodeInfo> Levels;
-
- public:
- bool addNodeToLevel(unsigned Level) {
- auto NumLevels = Levels.size();
- if (NumLevels > Level)
- return false;
- Levels.resize(Level + 1);
- return true;
- }
-
- NodeInfo &getNodeInfoAtLevel(unsigned Level) {
- assert(Level < Levels.size());
- return Levels[Level];
- }
- const NodeInfo &getNodeInfoAtLevel(unsigned Level) const {
- assert(Level < Levels.size());
- return Levels[Level];
- }
-
- unsigned getNumLevels() const { return Levels.size(); }
- };
-
-private:
- using ValueMap = DenseMap<Value *, ValueInfo>;
-
- ValueMap ValueImpls;
-
- NodeInfo *getNode(Node N) {
- auto Itr = ValueImpls.find(N.Val);
- if (Itr == ValueImpls.end() || Itr->second.getNumLevels() <= N.DerefLevel)
- return nullptr;
- return &Itr->second.getNodeInfoAtLevel(N.DerefLevel);
- }
-
-public:
- using const_value_iterator = ValueMap::const_iterator;
-
- bool addNode(Node N, AliasAttrs Attr = AliasAttrs()) {
- assert(N.Val != nullptr);
- auto &ValInfo = ValueImpls[N.Val];
- auto Changed = ValInfo.addNodeToLevel(N.DerefLevel);
- ValInfo.getNodeInfoAtLevel(N.DerefLevel).Attr |= Attr;
- return Changed;
- }
-
- void addAttr(Node N, AliasAttrs Attr) {
- auto *Info = getNode(N);
- assert(Info != nullptr);
- Info->Attr |= Attr;
- }
-
- void addEdge(Node From, Node To, int64_t Offset = 0) {
- auto *FromInfo = getNode(From);
- assert(FromInfo != nullptr);
- auto *ToInfo = getNode(To);
- assert(ToInfo != nullptr);
-
- FromInfo->Edges.push_back(Edge{To, Offset});
- ToInfo->ReverseEdges.push_back(Edge{From, Offset});
- }
-
- const NodeInfo *getNode(Node N) const {
- auto Itr = ValueImpls.find(N.Val);
- if (Itr == ValueImpls.end() || Itr->second.getNumLevels() <= N.DerefLevel)
- return nullptr;
- return &Itr->second.getNodeInfoAtLevel(N.DerefLevel);
- }
-
- AliasAttrs attrFor(Node N) const {
- auto *Info = getNode(N);
- assert(Info != nullptr);
- return Info->Attr;
- }
-
- iterator_range<const_value_iterator> value_mappings() const {
- return make_range<const_value_iterator>(ValueImpls.begin(),
- ValueImpls.end());
- }
-};
-
-///A builder class used to create CFLGraph instance from a given function
-/// The CFL-AA that uses this builder must provide its own type as a template
-/// argument. This is necessary for interprocedural processing: CFLGraphBuilder
-/// needs a way of obtaining the summary of other functions when callinsts are
-/// encountered.
-/// As a result, we expect the said CFL-AA to expose a getAliasSummary() public
-/// member function that takes a Function& and returns the corresponding summary
-/// as a const AliasSummary*.
-template <typename CFLAA> class CFLGraphBuilder {
- // Input of the builder
- CFLAA &Analysis;
- const TargetLibraryInfo &TLI;
-
- // Output of the builder
- CFLGraph Graph;
- SmallVector<Value *, 4> ReturnedValues;
-
- // Helper class
- /// Gets the edges our graph should have, based on an Instruction*
- class GetEdgesVisitor : public InstVisitor<GetEdgesVisitor, void> {
- CFLAA &AA;
- const DataLayout &DL;
- const TargetLibraryInfo &TLI;
-
- CFLGraph &Graph;
- SmallVectorImpl<Value *> &ReturnValues;
-
- static bool hasUsefulEdges(ConstantExpr *CE) {
- // ConstantExpr doesn't have terminators, invokes, or fences, so only
- // needs
- // to check for compares.
- return CE->getOpcode() != Instruction::ICmp &&
- CE->getOpcode() != Instruction::FCmp;
- }
-
- // Returns possible functions called by CS into the given SmallVectorImpl.
- // Returns true if targets found, false otherwise.
- static bool getPossibleTargets(CallSite CS,
- SmallVectorImpl<Function *> &Output) {
- if (auto *Fn = CS.getCalledFunction()) {
- Output.push_back(Fn);
- return true;
- }
-
- // TODO: If the call is indirect, we might be able to enumerate all
- // potential
- // targets of the call and return them, rather than just failing.
- return false;
- }
-
- void addNode(Value *Val, AliasAttrs Attr = AliasAttrs()) {
- assert(Val != nullptr && Val->getType()->isPointerTy());
- if (auto GVal = dyn_cast<GlobalValue>(Val)) {
- if (Graph.addNode(InstantiatedValue{GVal, 0},
- getGlobalOrArgAttrFromValue(*GVal)))
- Graph.addNode(InstantiatedValue{GVal, 1}, getAttrUnknown());
- } else if (auto CExpr = dyn_cast<ConstantExpr>(Val)) {
- if (hasUsefulEdges(CExpr)) {
- if (Graph.addNode(InstantiatedValue{CExpr, 0}))
- visitConstantExpr(CExpr);
- }
- } else
- Graph.addNode(InstantiatedValue{Val, 0}, Attr);
- }
-
- void addAssignEdge(Value *From, Value *To, int64_t Offset = 0) {
- assert(From != nullptr && To != nullptr);
- if (!From->getType()->isPointerTy() || !To->getType()->isPointerTy())
- return;
- addNode(From);
- if (To != From) {
- addNode(To);
- Graph.addEdge(InstantiatedValue{From, 0}, InstantiatedValue{To, 0},
- Offset);
- }
- }
-
- void addDerefEdge(Value *From, Value *To, bool IsRead) {
- assert(From != nullptr && To != nullptr);
- // FIXME: This is subtly broken, due to how we model some instructions
- // (e.g. extractvalue, extractelement) as loads. Since those take
- // non-pointer operands, we'll entirely skip adding edges for those.
- //
- // addAssignEdge seems to have a similar issue with insertvalue, etc.
- if (!From->getType()->isPointerTy() || !To->getType()->isPointerTy())
- return;
- addNode(From);
- addNode(To);
- if (IsRead) {
- Graph.addNode(InstantiatedValue{From, 1});
- Graph.addEdge(InstantiatedValue{From, 1}, InstantiatedValue{To, 0});
- } else {
- Graph.addNode(InstantiatedValue{To, 1});
- Graph.addEdge(InstantiatedValue{From, 0}, InstantiatedValue{To, 1});
- }
- }
-
- void addLoadEdge(Value *From, Value *To) { addDerefEdge(From, To, true); }
- void addStoreEdge(Value *From, Value *To) { addDerefEdge(From, To, false); }
-
- public:
- GetEdgesVisitor(CFLGraphBuilder &Builder, const DataLayout &DL)
- : AA(Builder.Analysis), DL(DL), TLI(Builder.TLI), Graph(Builder.Graph),
- ReturnValues(Builder.ReturnedValues) {}
-
- void visitInstruction(Instruction &) {
- llvm_unreachable("Unsupported instruction encountered");
- }
-
- void visitReturnInst(ReturnInst &Inst) {
- if (auto RetVal = Inst.getReturnValue()) {
- if (RetVal->getType()->isPointerTy()) {
- addNode(RetVal);
- ReturnValues.push_back(RetVal);
- }
- }
- }
-
- void visitPtrToIntInst(PtrToIntInst &Inst) {
- auto *Ptr = Inst.getOperand(0);
- addNode(Ptr, getAttrEscaped());
- }
-
- void visitIntToPtrInst(IntToPtrInst &Inst) {
- auto *Ptr = &Inst;
- addNode(Ptr, getAttrUnknown());
- }
-
- void visitCastInst(CastInst &Inst) {
- auto *Src = Inst.getOperand(0);
- addAssignEdge(Src, &Inst);
- }
-
- void visitBinaryOperator(BinaryOperator &Inst) {
- auto *Op1 = Inst.getOperand(0);
- auto *Op2 = Inst.getOperand(1);
- addAssignEdge(Op1, &Inst);
- addAssignEdge(Op2, &Inst);
- }
-
- void visitAtomicCmpXchgInst(AtomicCmpXchgInst &Inst) {
- auto *Ptr = Inst.getPointerOperand();
- auto *Val = Inst.getNewValOperand();
- addStoreEdge(Val, Ptr);
- }
-
- void visitAtomicRMWInst(AtomicRMWInst &Inst) {
- auto *Ptr = Inst.getPointerOperand();
- auto *Val = Inst.getValOperand();
- addStoreEdge(Val, Ptr);
- }
-
- void visitPHINode(PHINode &Inst) {
- for (Value *Val : Inst.incoming_values())
- addAssignEdge(Val, &Inst);
- }
-
- void visitGEP(GEPOperator &GEPOp) {
- uint64_t Offset = UnknownOffset;
- APInt APOffset(DL.getPointerSizeInBits(GEPOp.getPointerAddressSpace()),
- 0);
- if (GEPOp.accumulateConstantOffset(DL, APOffset))
- Offset = APOffset.getSExtValue();
-
- auto *Op = GEPOp.getPointerOperand();
- addAssignEdge(Op, &GEPOp, Offset);
- }
-
- void visitGetElementPtrInst(GetElementPtrInst &Inst) {
- auto *GEPOp = cast<GEPOperator>(&Inst);
- visitGEP(*GEPOp);
- }
-
- void visitSelectInst(SelectInst &Inst) {
- // Condition is not processed here (The actual statement producing
- // the condition result is processed elsewhere). For select, the
- // condition is evaluated, but not loaded, stored, or assigned
- // simply as a result of being the condition of a select.
-
- auto *TrueVal = Inst.getTrueValue();
- auto *FalseVal = Inst.getFalseValue();
- addAssignEdge(TrueVal, &Inst);
- addAssignEdge(FalseVal, &Inst);
- }
-
- void visitAllocaInst(AllocaInst &Inst) { addNode(&Inst); }
-
- void visitLoadInst(LoadInst &Inst) {
- auto *Ptr = Inst.getPointerOperand();
- auto *Val = &Inst;
- addLoadEdge(Ptr, Val);
- }
-
- void visitStoreInst(StoreInst &Inst) {
- auto *Ptr = Inst.getPointerOperand();
- auto *Val = Inst.getValueOperand();
- addStoreEdge(Val, Ptr);
- }
-
- void visitVAArgInst(VAArgInst &Inst) {
- // We can't fully model va_arg here. For *Ptr = Inst.getOperand(0), it
- // does
- // two things:
- // 1. Loads a value from *((T*)*Ptr).
- // 2. Increments (stores to) *Ptr by some target-specific amount.
- // For now, we'll handle this like a landingpad instruction (by placing
- // the
- // result in its own group, and having that group alias externals).
- if (Inst.getType()->isPointerTy())
- addNode(&Inst, getAttrUnknown());
- }
-
- static bool isFunctionExternal(Function *Fn) {
- return !Fn->hasExactDefinition();
- }
-
- bool tryInterproceduralAnalysis(CallSite CS,
- const SmallVectorImpl<Function *> &Fns) {
- assert(Fns.size() > 0);
-
- if (CS.arg_size() > MaxSupportedArgsInSummary)
- return false;
-
- // Exit early if we'll fail anyway
- for (auto *Fn : Fns) {
- if (isFunctionExternal(Fn) || Fn->isVarArg())
- return false;
- // Fail if the caller does not provide enough arguments
- assert(Fn->arg_size() <= CS.arg_size());
- if (!AA.getAliasSummary(*Fn))
- return false;
- }
-
- for (auto *Fn : Fns) {
- auto Summary = AA.getAliasSummary(*Fn);
- assert(Summary != nullptr);
-
- auto &RetParamRelations = Summary->RetParamRelations;
- for (auto &Relation : RetParamRelations) {
- auto IRelation = instantiateExternalRelation(Relation, CS);
- if (IRelation.hasValue()) {
- Graph.addNode(IRelation->From);
- Graph.addNode(IRelation->To);
- Graph.addEdge(IRelation->From, IRelation->To);
- }
- }
-
- auto &RetParamAttributes = Summary->RetParamAttributes;
- for (auto &Attribute : RetParamAttributes) {
- auto IAttr = instantiateExternalAttribute(Attribute, CS);
- if (IAttr.hasValue())
- Graph.addNode(IAttr->IValue, IAttr->Attr);
- }
- }
-
- return true;
- }
-
- void visitCallSite(CallSite CS) {
- auto Inst = CS.getInstruction();
-
- // Make sure all arguments and return value are added to the graph first
- for (Value *V : CS.args())
- if (V->getType()->isPointerTy())
- addNode(V);
- if (Inst->getType()->isPointerTy())
- addNode(Inst);
-
- // Check if Inst is a call to a library function that
- // allocates/deallocates on the heap. Those kinds of functions do not
- // introduce any aliases.
- // TODO: address other common library functions such as realloc(),
- // strdup(), etc.
- if (isMallocOrCallocLikeFn(Inst, &TLI) || isFreeCall(Inst, &TLI))
- return;
-
- // TODO: Add support for noalias args/all the other fun function
- // attributes that we can tack on.
- SmallVector<Function *, 4> Targets;
- if (getPossibleTargets(CS, Targets))
- if (tryInterproceduralAnalysis(CS, Targets))
- return;
-
- // Because the function is opaque, we need to note that anything
- // could have happened to the arguments (unless the function is marked
- // readonly or readnone), and that the result could alias just about
- // anything, too (unless the result is marked noalias).
- if (!CS.onlyReadsMemory())
- for (Value *V : CS.args()) {
- if (V->getType()->isPointerTy()) {
- // The argument itself escapes.
- Graph.addAttr(InstantiatedValue{V, 0}, getAttrEscaped());
- // The fate of argument memory is unknown. Note that since
- // AliasAttrs is transitive with respect to dereference, we only
- // need to specify it for the first-level memory.
- Graph.addNode(InstantiatedValue{V, 1}, getAttrUnknown());
- }
- }
-
- if (Inst->getType()->isPointerTy()) {
- auto *Fn = CS.getCalledFunction();
- if (Fn == nullptr || !Fn->returnDoesNotAlias())
- // No need to call addNode() since we've added Inst at the
- // beginning of this function and we know it is not a global.
- Graph.addAttr(InstantiatedValue{Inst, 0}, getAttrUnknown());
- }
- }
-
- /// Because vectors/aggregates are immutable and unaddressable, there's
- /// nothing we can do to coax a value out of them, other than calling
- /// Extract{Element,Value}. We can effectively treat them as pointers to
- /// arbitrary memory locations we can store in and load from.
- void visitExtractElementInst(ExtractElementInst &Inst) {
- auto *Ptr = Inst.getVectorOperand();
- auto *Val = &Inst;
- addLoadEdge(Ptr, Val);
- }
-
- void visitInsertElementInst(InsertElementInst &Inst) {
- auto *Vec = Inst.getOperand(0);
- auto *Val = Inst.getOperand(1);
- addAssignEdge(Vec, &Inst);
- addStoreEdge(Val, &Inst);
- }
-
- void visitLandingPadInst(LandingPadInst &Inst) {
- // Exceptions come from "nowhere", from our analysis' perspective.
- // So we place the instruction its own group, noting that said group may
- // alias externals
- if (Inst.getType()->isPointerTy())
- addNode(&Inst, getAttrUnknown());
- }
-
- void visitInsertValueInst(InsertValueInst &Inst) {
- auto *Agg = Inst.getOperand(0);
- auto *Val = Inst.getOperand(1);
- addAssignEdge(Agg, &Inst);
- addStoreEdge(Val, &Inst);
- }
-
- void visitExtractValueInst(ExtractValueInst &Inst) {
- auto *Ptr = Inst.getAggregateOperand();
- addLoadEdge(Ptr, &Inst);
- }
-
- void visitShuffleVectorInst(ShuffleVectorInst &Inst) {
- auto *From1 = Inst.getOperand(0);
- auto *From2 = Inst.getOperand(1);
- addAssignEdge(From1, &Inst);
- addAssignEdge(From2, &Inst);
- }
-
- void visitConstantExpr(ConstantExpr *CE) {
- switch (CE->getOpcode()) {
- case Instruction::GetElementPtr: {
- auto GEPOp = cast<GEPOperator>(CE);
- visitGEP(*GEPOp);
- break;
- }
-
- case Instruction::PtrToInt: {
- addNode(CE->getOperand(0), getAttrEscaped());
- break;
- }
-
- case Instruction::IntToPtr: {
- addNode(CE, getAttrUnknown());
- break;
- }
-
- case Instruction::BitCast:
- case Instruction::AddrSpaceCast:
- case Instruction::Trunc:
- case Instruction::ZExt:
- case Instruction::SExt:
- case Instruction::FPExt:
- case Instruction::FPTrunc:
- case Instruction::UIToFP:
- case Instruction::SIToFP:
- case Instruction::FPToUI:
- case Instruction::FPToSI: {
- addAssignEdge(CE->getOperand(0), CE);
- break;
- }
-
- case Instruction::Select: {
- addAssignEdge(CE->getOperand(1), CE);
- addAssignEdge(CE->getOperand(2), CE);
- break;
- }
-
- case Instruction::InsertElement:
- case Instruction::InsertValue: {
- addAssignEdge(CE->getOperand(0), CE);
- addStoreEdge(CE->getOperand(1), CE);
- break;
- }
-
- case Instruction::ExtractElement:
- case Instruction::ExtractValue: {
- addLoadEdge(CE->getOperand(0), CE);
- break;
- }
-
- case Instruction::Add:
- case Instruction::Sub:
- case Instruction::FSub:
- case Instruction::Mul:
- case Instruction::FMul:
- case Instruction::UDiv:
- case Instruction::SDiv:
- case Instruction::FDiv:
- case Instruction::URem:
- case Instruction::SRem:
- case Instruction::FRem:
- case Instruction::And:
- case Instruction::Or:
- case Instruction::Xor:
- case Instruction::Shl:
- case Instruction::LShr:
- case Instruction::AShr:
- case Instruction::ICmp:
- case Instruction::FCmp:
- case Instruction::ShuffleVector: {
- addAssignEdge(CE->getOperand(0), CE);
- addAssignEdge(CE->getOperand(1), CE);
- break;
- }
-
- default:
- llvm_unreachable("Unknown instruction type encountered!");
- }
- }
- };
-
- // Helper functions
-
- // Determines whether or not we an instruction is useless to us (e.g.
- // FenceInst)
- static bool hasUsefulEdges(Instruction *Inst) {
- bool IsNonInvokeRetTerminator = Inst->isTerminator() &&
- !isa<InvokeInst>(Inst) &&
- !isa<ReturnInst>(Inst);
- return !isa<CmpInst>(Inst) && !isa<FenceInst>(Inst) &&
- !IsNonInvokeRetTerminator;
- }
-
- void addArgumentToGraph(Argument &Arg) {
- if (Arg.getType()->isPointerTy()) {
- Graph.addNode(InstantiatedValue{&Arg, 0},
- getGlobalOrArgAttrFromValue(Arg));
- // Pointees of a formal parameter is known to the caller
- Graph.addNode(InstantiatedValue{&Arg, 1}, getAttrCaller());
- }
- }
-
- // Given an Instruction, this will add it to the graph, along with any
- // Instructions that are potentially only available from said Instruction
- // For example, given the following line:
- // %0 = load i16* getelementptr ([1 x i16]* @a, 0, 0), align 2
- // addInstructionToGraph would add both the `load` and `getelementptr`
- // instructions to the graph appropriately.
- void addInstructionToGraph(GetEdgesVisitor &Visitor, Instruction &Inst) {
- if (!hasUsefulEdges(&Inst))
- return;
-
- Visitor.visit(Inst);
- }
-
- // Builds the graph needed for constructing the StratifiedSets for the given
- // function
- void buildGraphFrom(Function &Fn) {
- GetEdgesVisitor Visitor(*this, Fn.getParent()->getDataLayout());
-
- for (auto &Bb : Fn.getBasicBlockList())
- for (auto &Inst : Bb.getInstList())
- addInstructionToGraph(Visitor, Inst);
-
- for (auto &Arg : Fn.args())
- addArgumentToGraph(Arg);
- }
-
-public:
- CFLGraphBuilder(CFLAA &Analysis, const TargetLibraryInfo &TLI, Function &Fn)
- : Analysis(Analysis), TLI(TLI) {
- buildGraphFrom(Fn);
- }
-
- const CFLGraph &getCFLGraph() const { return Graph; }
- const SmallVector<Value *, 4> &getReturnValues() const {
- return ReturnedValues;
- }
-};
-
-} // end namespace cflaa
-} // end namespace llvm
-
-#endif // LLVM_LIB_ANALYSIS_CFLGRAPH_H