2c677c34d5
available, things get much simplified. One addition is that CompoundLiteralExpr can appear both in rvalue and lvalue context. llvm-svn: 58837
286 lines
8.5 KiB
C++
286 lines
8.5 KiB
C++
//= GRState*cpp - Path-Sens. "State" for tracking valuues -----*- C++ -*--=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines SymbolID, ExprBindKey, and GRState*
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Analysis/PathSensitive/GRStateTrait.h"
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#include "clang/Analysis/PathSensitive/GRState.h"
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#include "clang/Analysis/PathSensitive/GRTransferFuncs.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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// Give the vtable for ConstraintManager somewhere to live.
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ConstraintManager::~ConstraintManager() {}
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GRStateManager::~GRStateManager() {
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for (std::vector<GRState::Printer*>::iterator I=Printers.begin(),
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E=Printers.end(); I!=E; ++I)
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delete *I;
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for (GDMContextsTy::iterator I=GDMContexts.begin(), E=GDMContexts.end();
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I!=E; ++I)
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I->second.second(I->second.first);
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}
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const GRState*
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GRStateManager::RemoveDeadBindings(const GRState* St, Stmt* Loc,
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const LiveVariables& Liveness,
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DeadSymbolsTy& DSymbols) {
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// This code essentially performs a "mark-and-sweep" of the VariableBindings.
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// The roots are any Block-level exprs and Decls that our liveness algorithm
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// tells us are live. We then see what Decls they may reference, and keep
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// those around. This code more than likely can be made faster, and the
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// frequency of which this method is called should be experimented with
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// for optimum performance.
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llvm::SmallVector<const MemRegion*, 10> RegionRoots;
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StoreManager::LiveSymbolsTy LSymbols;
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GRState NewSt = *St;
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NewSt.Env =
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EnvMgr.RemoveDeadBindings(NewSt.Env, Loc, Liveness, RegionRoots, LSymbols);
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// Clean up the store.
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DSymbols.clear();
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NewSt.St = StoreMgr->RemoveDeadBindings(St->getStore(), Loc, Liveness,
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RegionRoots, LSymbols, DSymbols);
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return ConstraintMgr->RemoveDeadBindings(getPersistentState(NewSt),
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LSymbols, DSymbols);
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}
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const GRState* GRStateManager::BindLoc(const GRState* St, Loc LV, SVal V) {
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Store OldStore = St->getStore();
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Store NewStore = StoreMgr->Bind(OldStore, LV, V);
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if (NewStore == OldStore)
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return St;
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GRState NewSt = *St;
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NewSt.St = NewStore;
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return getPersistentState(NewSt);
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}
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const GRState* GRStateManager::BindDecl(const GRState* St, const VarDecl* VD,
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Expr* Ex, unsigned Count) {
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Store OldStore = St->getStore();
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Store NewStore;
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if (Ex)
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NewStore = StoreMgr->BindDecl(OldStore, VD, Ex, GetSVal(St, Ex), Count);
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else
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NewStore = StoreMgr->BindDecl(OldStore, VD, Ex);
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if (NewStore == OldStore)
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return St;
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GRState NewSt = *St;
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NewSt.St = NewStore;
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return getPersistentState(NewSt);
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}
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/// BindCompoundLiteral - Return the store that has the bindings currently
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/// in 'store' plus the bindings for the CompoundLiteral. 'R' is the region
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/// for the compound literal and 'BegInit' and 'EndInit' represent an
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/// array of initializer values.
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const GRState*
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GRStateManager::BindCompoundLiteral(const GRState* state,
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const CompoundLiteralExpr* CL, SVal ILV) {
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Store oldStore = state->getStore();
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Store newStore = StoreMgr->BindCompoundLiteral(oldStore, CL, ILV);
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if (newStore == oldStore)
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return state;
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GRState newState = *state;
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newState.St = newStore;
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return getPersistentState(newState);
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}
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const GRState* GRStateManager::Unbind(const GRState* St, Loc LV) {
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Store OldStore = St->getStore();
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Store NewStore = StoreMgr->Remove(OldStore, LV);
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if (NewStore == OldStore)
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return St;
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GRState NewSt = *St;
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NewSt.St = NewStore;
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return getPersistentState(NewSt);
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}
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const GRState* GRStateManager::getInitialState() {
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GRState StateImpl(EnvMgr.getInitialEnvironment(),
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StoreMgr->getInitialStore(),
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GDMFactory.GetEmptyMap());
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return getPersistentState(StateImpl);
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}
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const GRState* GRStateManager::getPersistentState(GRState& State) {
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llvm::FoldingSetNodeID ID;
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State.Profile(ID);
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void* InsertPos;
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if (GRState* I = StateSet.FindNodeOrInsertPos(ID, InsertPos))
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return I;
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GRState* I = (GRState*) Alloc.Allocate<GRState>();
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new (I) GRState(State);
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StateSet.InsertNode(I, InsertPos);
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return I;
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}
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//===----------------------------------------------------------------------===//
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// State pretty-printing.
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//===----------------------------------------------------------------------===//
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void GRState::print(std::ostream& Out, StoreManager& StoreMgr,
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ConstraintManager& ConstraintMgr,
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Printer** Beg, Printer** End,
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const char* nl, const char* sep) const {
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// Print the store.
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StoreMgr.print(getStore(), Out, nl, sep);
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// Print Subexpression bindings.
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bool isFirst = true;
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for (seb_iterator I = seb_begin(), E = seb_end(); I != E; ++I) {
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if (isFirst) {
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Out << nl << nl << "Sub-Expressions:" << nl;
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isFirst = false;
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}
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else { Out << nl; }
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Out << " (" << (void*) I.getKey() << ") ";
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llvm::raw_os_ostream OutS(Out);
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I.getKey()->printPretty(OutS);
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OutS.flush();
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Out << " : ";
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I.getData().print(Out);
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}
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// Print block-expression bindings.
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isFirst = true;
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for (beb_iterator I = beb_begin(), E = beb_end(); I != E; ++I) {
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if (isFirst) {
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Out << nl << nl << "Block-level Expressions:" << nl;
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isFirst = false;
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}
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else { Out << nl; }
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Out << " (" << (void*) I.getKey() << ") ";
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llvm::raw_os_ostream OutS(Out);
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I.getKey()->printPretty(OutS);
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OutS.flush();
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Out << " : ";
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I.getData().print(Out);
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}
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ConstraintMgr.print(this, Out, nl, sep);
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// Print checker-specific data.
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for ( ; Beg != End ; ++Beg) (*Beg)->Print(Out, this, nl, sep);
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}
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void GRStateRef::printDOT(std::ostream& Out) const {
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print(Out, "\\l", "\\|");
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}
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void GRStateRef::printStdErr() const {
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print(*llvm::cerr);
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}
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void GRStateRef::print(std::ostream& Out, const char* nl, const char* sep)const{
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GRState::Printer **beg = Mgr->Printers.empty() ? 0 : &Mgr->Printers[0];
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GRState::Printer **end = !beg ? 0 : beg + Mgr->Printers.size();
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St->print(Out, *Mgr->StoreMgr, *Mgr->ConstraintMgr, beg, end, nl, sep);
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}
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//===----------------------------------------------------------------------===//
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// Generic Data Map.
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//===----------------------------------------------------------------------===//
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void* const* GRState::FindGDM(void* K) const {
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return GDM.lookup(K);
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}
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void*
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GRStateManager::FindGDMContext(void* K,
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void* (*CreateContext)(llvm::BumpPtrAllocator&),
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void (*DeleteContext)(void*)) {
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std::pair<void*, void (*)(void*)>& p = GDMContexts[K];
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if (!p.first) {
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p.first = CreateContext(Alloc);
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p.second = DeleteContext;
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}
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return p.first;
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}
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const GRState* GRStateManager::addGDM(const GRState* St, void* Key, void* Data){
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GRState::GenericDataMap M1 = St->getGDM();
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GRState::GenericDataMap M2 = GDMFactory.Add(M1, Key, Data);
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if (M1 == M2)
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return St;
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GRState NewSt = *St;
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NewSt.GDM = M2;
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return getPersistentState(NewSt);
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}
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//===----------------------------------------------------------------------===//
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// Queries.
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//===----------------------------------------------------------------------===//
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bool GRStateManager::isEqual(const GRState* state, Expr* Ex,
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const llvm::APSInt& Y) {
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SVal V = GetSVal(state, Ex);
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if (loc::ConcreteInt* X = dyn_cast<loc::ConcreteInt>(&V))
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return X->getValue() == Y;
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if (nonloc::ConcreteInt* X = dyn_cast<nonloc::ConcreteInt>(&V))
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return X->getValue() == Y;
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if (nonloc::SymbolVal* X = dyn_cast<nonloc::SymbolVal>(&V))
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return ConstraintMgr->isEqual(state, X->getSymbol(), Y);
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if (loc::SymbolVal* X = dyn_cast<loc::SymbolVal>(&V))
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return ConstraintMgr->isEqual(state, X->getSymbol(), Y);
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return false;
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}
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bool GRStateManager::isEqual(const GRState* state, Expr* Ex, uint64_t x) {
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return isEqual(state, Ex, BasicVals.getValue(x, Ex->getType()));
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}
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//===----------------------------------------------------------------------===//
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// Persistent values for indexing into the Generic Data Map.
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int GRState::NullDerefTag::TagInt = 0;
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