mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2025-04-02 13:12:09 +00:00
058a7a450a
Introduce the boolean ento::shouldRegister##CHECKERNAME(const LangOptions &LO) function very similarly to ento::register##CHECKERNAME. This will force every checker to implement this function, but maybe it isn't that bad: I saw a lot of ObjC or C++ specific checkers that should probably not register themselves based on some LangOptions (mine too), but they do anyways. A big benefit of this is that all registry functions now register their checker, once it is called, registration is guaranteed. This patch is a part of a greater effort to reinvent checker registration, more info here: D54438#1315953 Differential Revision: https://reviews.llvm.org/D55424 llvm-svn: 352277
106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
// UndefCapturedBlockVarChecker.cpp - Uninitialized captured vars -*- C++ -*-=//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This checker detects blocks that capture uninitialized values.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
|
|
#include "clang/AST/Attr.h"
|
|
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
|
|
#include "clang/StaticAnalyzer/Core/Checker.h"
|
|
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
|
|
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
|
|
#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
using namespace clang;
|
|
using namespace ento;
|
|
|
|
namespace {
|
|
class UndefCapturedBlockVarChecker
|
|
: public Checker< check::PostStmt<BlockExpr> > {
|
|
mutable std::unique_ptr<BugType> BT;
|
|
|
|
public:
|
|
void checkPostStmt(const BlockExpr *BE, CheckerContext &C) const;
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
static const DeclRefExpr *FindBlockDeclRefExpr(const Stmt *S,
|
|
const VarDecl *VD) {
|
|
if (const DeclRefExpr *BR = dyn_cast<DeclRefExpr>(S))
|
|
if (BR->getDecl() == VD)
|
|
return BR;
|
|
|
|
for (const Stmt *Child : S->children())
|
|
if (Child)
|
|
if (const DeclRefExpr *BR = FindBlockDeclRefExpr(Child, VD))
|
|
return BR;
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
void
|
|
UndefCapturedBlockVarChecker::checkPostStmt(const BlockExpr *BE,
|
|
CheckerContext &C) const {
|
|
if (!BE->getBlockDecl()->hasCaptures())
|
|
return;
|
|
|
|
ProgramStateRef state = C.getState();
|
|
auto *R = cast<BlockDataRegion>(C.getSVal(BE).getAsRegion());
|
|
|
|
BlockDataRegion::referenced_vars_iterator I = R->referenced_vars_begin(),
|
|
E = R->referenced_vars_end();
|
|
|
|
for (; I != E; ++I) {
|
|
// This VarRegion is the region associated with the block; we need
|
|
// the one associated with the encompassing context.
|
|
const VarRegion *VR = I.getCapturedRegion();
|
|
const VarDecl *VD = VR->getDecl();
|
|
|
|
if (VD->hasAttr<BlocksAttr>() || !VD->hasLocalStorage())
|
|
continue;
|
|
|
|
// Get the VarRegion associated with VD in the local stack frame.
|
|
if (Optional<UndefinedVal> V =
|
|
state->getSVal(I.getOriginalRegion()).getAs<UndefinedVal>()) {
|
|
if (ExplodedNode *N = C.generateErrorNode()) {
|
|
if (!BT)
|
|
BT.reset(
|
|
new BuiltinBug(this, "uninitialized variable captured by block"));
|
|
|
|
// Generate a bug report.
|
|
SmallString<128> buf;
|
|
llvm::raw_svector_ostream os(buf);
|
|
|
|
os << "Variable '" << VD->getName()
|
|
<< "' is uninitialized when captured by block";
|
|
|
|
auto R = llvm::make_unique<BugReport>(*BT, os.str(), N);
|
|
if (const Expr *Ex = FindBlockDeclRefExpr(BE->getBody(), VD))
|
|
R->addRange(Ex->getSourceRange());
|
|
R->addVisitor(llvm::make_unique<FindLastStoreBRVisitor>(
|
|
*V, VR, /*EnableNullFPSuppression*/ false));
|
|
R->disablePathPruning();
|
|
// need location of block
|
|
C.emitReport(std::move(R));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void ento::registerUndefCapturedBlockVarChecker(CheckerManager &mgr) {
|
|
mgr.registerChecker<UndefCapturedBlockVarChecker>();
|
|
}
|
|
|
|
bool ento::shouldRegisterUndefCapturedBlockVarChecker(const LangOptions &LO) {
|
|
return true;
|
|
}
|