forked from OSchip/llvm-project
103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
// UndefCapturedBlockVarChecker.cpp - Uninitialized captured vars -*- 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 checker detects blocks that capture uninitialized values.
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//
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//===----------------------------------------------------------------------===//
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#include "InternalChecks.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerVisitor.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
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#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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using namespace ento;
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namespace {
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class UndefCapturedBlockVarChecker
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: public CheckerVisitor<UndefCapturedBlockVarChecker> {
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BugType *BT;
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public:
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UndefCapturedBlockVarChecker() : BT(0) {}
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static void *getTag() { static int tag = 0; return &tag; }
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void PostVisitBlockExpr(CheckerContext &C, const BlockExpr *BE);
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};
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} // end anonymous namespace
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void ento::RegisterUndefCapturedBlockVarChecker(ExprEngine &Eng) {
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Eng.registerCheck(new UndefCapturedBlockVarChecker());
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}
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static const BlockDeclRefExpr *FindBlockDeclRefExpr(const Stmt *S,
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const VarDecl *VD){
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if (const BlockDeclRefExpr *BR = dyn_cast<BlockDeclRefExpr>(S))
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if (BR->getDecl() == VD)
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return BR;
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for (Stmt::const_child_iterator I = S->child_begin(), E = S->child_end();
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I!=E; ++I)
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if (const Stmt *child = *I) {
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const BlockDeclRefExpr *BR = FindBlockDeclRefExpr(child, VD);
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if (BR)
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return BR;
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}
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return NULL;
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}
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void
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UndefCapturedBlockVarChecker::PostVisitBlockExpr(CheckerContext &C,
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const BlockExpr *BE) {
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if (!BE->getBlockDecl()->hasCaptures())
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return;
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const GRState *state = C.getState();
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const BlockDataRegion *R =
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cast<BlockDataRegion>(state->getSVal(BE).getAsRegion());
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BlockDataRegion::referenced_vars_iterator I = R->referenced_vars_begin(),
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E = R->referenced_vars_end();
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for (; I != E; ++I) {
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// This VarRegion is the region associated with the block; we need
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// the one associated with the encompassing context.
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const VarRegion *VR = *I;
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const VarDecl *VD = VR->getDecl();
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if (VD->getAttr<BlocksAttr>() || !VD->hasLocalStorage())
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continue;
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// Get the VarRegion associated with VD in the local stack frame.
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const LocationContext *LC = C.getPredecessor()->getLocationContext();
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VR = C.getSValBuilder().getRegionManager().getVarRegion(VD, LC);
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if (state->getSVal(VR).isUndef())
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if (ExplodedNode *N = C.generateSink()) {
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if (!BT)
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BT = new BuiltinBug("uninitialized variable captured by block");
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// Generate a bug report.
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llvm::SmallString<128> buf;
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llvm::raw_svector_ostream os(buf);
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os << "Variable '" << VD->getName()
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<< "' is uninitialized when captured by block";
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EnhancedBugReport *R = new EnhancedBugReport(*BT, os.str(), N);
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if (const Expr *Ex = FindBlockDeclRefExpr(BE->getBody(), VD))
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R->addRange(Ex->getSourceRange());
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R->addVisitorCreator(bugreporter::registerFindLastStore, VR);
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// need location of block
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C.EmitReport(R);
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}
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}
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}
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