t-8ch created this revision.
Herald added subscribers: steakhal, manas, ASDenysPetrov, martong, dkrupp,
donat.nagy, Szelethus, mikhail.ramalho, a.sidorin, szepet, baloghadamsoftware,
xazax.hun.
Herald added a reviewer: NoQ.
Herald added a project: All.
t-8ch requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D131067
Files:
clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
clang/test/Analysis/dead-stores.cpp
Index: clang/test/Analysis/dead-stores.cpp
===================================================================
--- clang/test/Analysis/dead-stores.cpp
+++ clang/test/Analysis/dead-stores.cpp
@@ -217,3 +217,26 @@
return i + j;
}
+//===----------------------------------------------------------------------===//
+// Dead store checking involving references.
+//===----------------------------------------------------------------------===//
+
+void functionReferenceParameter(int &i) {
+ i = 5; // no warning
+}
+
+struct constructorReferenceParameter {
+ constructorReferenceParameter(int &i) {
+ i = 5; // no warning
+ }
+};
+
+void referenceParameters() {
+ int i = 5;
+ functionReferenceParameter(i);
+ i = 6;
+
+ int j = 7;
+ constructorReferenceParameter k(j);
+ j = 8;
+}
Index: clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
@@ -483,12 +483,21 @@
void operator()(const Stmt *S) {
// Check for '&'. Any VarDecl whose address has been taken we treat as
// escaped.
- // FIXME: What about references?
if (auto *LE = dyn_cast<LambdaExpr>(S)) {
findLambdaReferenceCaptures(LE);
return;
}
+ if (auto *CE = dyn_cast<CallExpr>(S)) {
+ findCallReferenceParameters(CE);
+ return;
+ }
+
+ if (auto *CE = dyn_cast<CXXConstructExpr>(S)) {
+ findConstructorReferenceParameters(CE);
+ return;
+ }
+
const UnaryOperator *U = dyn_cast<UnaryOperator>(S);
if (!U)
return;
@@ -522,6 +531,33 @@
Escaped.insert(VD);
}
}
+
+ void findReferenceParameter(const ParmVarDecl *Param, const Expr *Arg) {
+ if (Param->getType()->isReferenceType()) {
+ if (auto *DRE = dyn_cast<DeclRefExpr>(Arg)) {
+ if (auto *VD = dyn_cast<VarDecl>(DRE->getDecl())) {
+ Escaped.insert(VD);
+ }
+ }
+ }
+ }
+
+ void findCallReferenceParameters(const CallExpr *CE) {
+ if (auto *FD = dyn_cast<FunctionDecl>(CE->getCalleeDecl())) {
+ unsigned numParams = FD->getNumParams();
+ for (unsigned i = 0; i < numParams; ++i) {
+ findReferenceParameter(FD->getParamDecl(i), CE->getArg(i));
+ }
+ }
+ }
+
+ void findConstructorReferenceParameters(const CXXConstructExpr *CE) {
+ const FunctionDecl *FD = CE->getConstructor();
+ unsigned numParams = FD->getNumParams();
+ for (unsigned i = 0; i < numParams; ++i) {
+ findReferenceParameter(FD->getParamDecl(i), CE->getArg(i));
+ }
+ }
};
} // end anonymous namespace
Index: clang/test/Analysis/dead-stores.cpp
===================================================================
--- clang/test/Analysis/dead-stores.cpp
+++ clang/test/Analysis/dead-stores.cpp
@@ -217,3 +217,26 @@
return i + j;
}
+//===----------------------------------------------------------------------===//
+// Dead store checking involving references.
+//===----------------------------------------------------------------------===//
+
+void functionReferenceParameter(int &i) {
+ i = 5; // no warning
+}
+
+struct constructorReferenceParameter {
+ constructorReferenceParameter(int &i) {
+ i = 5; // no warning
+ }
+};
+
+void referenceParameters() {
+ int i = 5;
+ functionReferenceParameter(i);
+ i = 6;
+
+ int j = 7;
+ constructorReferenceParameter k(j);
+ j = 8;
+}
Index: clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
@@ -483,12 +483,21 @@
void operator()(const Stmt *S) {
// Check for '&'. Any VarDecl whose address has been taken we treat as
// escaped.
- // FIXME: What about references?
if (auto *LE = dyn_cast<LambdaExpr>(S)) {
findLambdaReferenceCaptures(LE);
return;
}
+ if (auto *CE = dyn_cast<CallExpr>(S)) {
+ findCallReferenceParameters(CE);
+ return;
+ }
+
+ if (auto *CE = dyn_cast<CXXConstructExpr>(S)) {
+ findConstructorReferenceParameters(CE);
+ return;
+ }
+
const UnaryOperator *U = dyn_cast<UnaryOperator>(S);
if (!U)
return;
@@ -522,6 +531,33 @@
Escaped.insert(VD);
}
}
+
+ void findReferenceParameter(const ParmVarDecl *Param, const Expr *Arg) {
+ if (Param->getType()->isReferenceType()) {
+ if (auto *DRE = dyn_cast<DeclRefExpr>(Arg)) {
+ if (auto *VD = dyn_cast<VarDecl>(DRE->getDecl())) {
+ Escaped.insert(VD);
+ }
+ }
+ }
+ }
+
+ void findCallReferenceParameters(const CallExpr *CE) {
+ if (auto *FD = dyn_cast<FunctionDecl>(CE->getCalleeDecl())) {
+ unsigned numParams = FD->getNumParams();
+ for (unsigned i = 0; i < numParams; ++i) {
+ findReferenceParameter(FD->getParamDecl(i), CE->getArg(i));
+ }
+ }
+ }
+
+ void findConstructorReferenceParameters(const CXXConstructExpr *CE) {
+ const FunctionDecl *FD = CE->getConstructor();
+ unsigned numParams = FD->getNumParams();
+ for (unsigned i = 0; i < numParams; ++i) {
+ findReferenceParameter(FD->getParamDecl(i), CE->getArg(i));
+ }
+ }
};
} // end anonymous namespace
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