[PATCH] D61958: [analyzer] RetainCount: Fix a crash when os_returns_retained_on_zero (_nonzero) is applied to functions that return weird stuff.

[Artem Dergachev via Phabricator via cfe-commits]

NoQ created this revision.
NoQ added a reviewer: dcoughlin.
Herald added subscribers: cfe-commits, Charusso, dkrupp, donat.nagy, Szelethus, 
mikhail.ramalho, a.sidorin, szepet, baloghadamsoftware, xazax.hun.
Herald added a project: clang.

The checker crashes when it tries to assume a structure to be null or non-null 
so that to evaluate the effect of the annotation.


Repository:
  rC Clang

https://reviews.llvm.org/D61958

Files:
  clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp
  clang/test/Analysis/osobject-retain-release.cpp


Index: clang/test/Analysis/osobject-retain-release.cpp
===================================================================
--- clang/test/Analysis/osobject-retain-release.cpp
+++ clang/test/Analysis/osobject-retain-release.cpp
@@ -702,3 +702,16 @@
   // returning from it at +0.
   return table; // no-warning
 }
+
+namespace weird_result {
+struct WeirdResult {
+  int x, y, z;
+};
+
+WeirdResult outParamWithWeirdResult(OS_RETURNS_RETAINED_ON_ZERO OSObject 
**obj);
+
+WeirdResult testOutParamWithWeirdResult() {
+  OSObject *obj;
+  return outParamWithWeirdResult(&obj); // no-warning
+}
+} // namespace weird_result
Index: 
clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp
@@ -537,6 +537,11 @@
   ProgramStateRef AssumeZeroReturn = State;
 
   if (SplitNecessary) {
+    if (!CE.getResultType()->isScalarType()) {
+      // Structures cannot be assumed. This probably deserves
+      // a compiler warning for invalid annotations.
+      return {State};
+    }
     if (auto DL = L.getAs<DefinedOrUnknownSVal>()) {
       AssumeNonZeroReturn = AssumeNonZeroReturn->assume(*DL, true);
       AssumeZeroReturn = AssumeZeroReturn->assume(*DL, false);



Index: clang/test/Analysis/osobject-retain-release.cpp
===================================================================
--- clang/test/Analysis/osobject-retain-release.cpp
+++ clang/test/Analysis/osobject-retain-release.cpp
@@ -702,3 +702,16 @@
   // returning from it at +0.
   return table; // no-warning
 }
+
+namespace weird_result {
+struct WeirdResult {
+  int x, y, z;
+};
+
+WeirdResult outParamWithWeirdResult(OS_RETURNS_RETAINED_ON_ZERO OSObject **obj);
+
+WeirdResult testOutParamWithWeirdResult() {
+  OSObject *obj;
+  return outParamWithWeirdResult(&obj); // no-warning
+}
+} // namespace weird_result
Index: clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp
@@ -537,6 +537,11 @@
   ProgramStateRef AssumeZeroReturn = State;
 
   if (SplitNecessary) {
+    if (!CE.getResultType()->isScalarType()) {
+      // Structures cannot be assumed. This probably deserves
+      // a compiler warning for invalid annotations.
+      return {State};
+    }
     if (auto DL = L.getAs<DefinedOrUnknownSVal>()) {
       AssumeNonZeroReturn = AssumeNonZeroReturn->assume(*DL, true);
       AssumeZeroReturn = AssumeZeroReturn->assume(*DL, false);

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