[analyzer] pr38838, pr39976: Fix crash on diagnosing before implicit destructor.

We need to be able to emit the diagnostic at PreImplicitCall,
and the patch implements this functionality.

However, for now the need for emitting such diagnostics is not all that great:
it is only necessary to not crash when emitting a false positive due to an
unrelated issue of having dead symbol collection not working properly.

Coming up with a non-false-positive test seems impossible with the current
set of checkers, though it is likely to be needed for good things as well
in the future.

Differential Revision: https://reviews.llvm.org/D56042

rdar://problem/46911462

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@350907 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/StaticAnalyzer/Core/PathDiagnostic.cpp b/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
index 691176dfc1ff2073f384861f25a2517afb008be5..3e93bb6a7c4fc7fa76346a0067925458b950dc48 100644 (file)
--- a/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
+++ b/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
@@ -723,6 +723,8 @@ PathDiagnosticLocation::create(const ProgramPoint& P,
   } else if (Optional<PostInitializer> PIP = P.getAs<PostInitializer>()) {
     return PathDiagnosticLocation(PIP->getInitializer()->getSourceLocation(),
                                   SMng);
+  } else if (Optional<PreImplicitCall> PIC = P.getAs<PreImplicitCall>()) {
+    return PathDiagnosticLocation(PIC->getLocation(), SMng);
   } else if (Optional<PostImplicitCall> PIE = P.getAs<PostImplicitCall>()) {
     return PathDiagnosticLocation(PIE->getLocation(), SMng);
   } else if (Optional<CallEnter> CE = P.getAs<CallEnter>()) {

diff --git a/test/Analysis/diagnostics/dtors.cpp b/test/Analysis/diagnostics/dtors.cpp
new file mode 100644 (file)
index 0000000..094917e
--- /dev/null
+++ b/test/Analysis/diagnostics/dtors.cpp
@@ -0,0 +1,25 @@
+// RUN: %clang_analyze_cc1 -w -analyzer-checker=core,cplusplus -verify %s
+
+// expected-no-diagnostics
+
+namespace no_crash_on_delete_dtor {
+// We were crashing when producing diagnostics for this code.
+struct S {
+  void foo();
+  ~S();
+};
+
+struct smart_ptr {
+  int x;
+  S *s;
+  smart_ptr(S *);
+  S *get() {
+    return (x || 0) ? nullptr : s;
+  }
+};
+
+void bar(smart_ptr p) {
+  delete p.get();
+  p.get()->foo();
+}
+} // namespace no_crash_on_delete_dtor