[PATCH] D50408: [analyzer] Avoid querying this-pointers for static-methods.

[Matt Davis via Phabricator via cfe-commits]

mattd created this revision.
mattd added a reviewer: dcoughlin.
Herald added subscribers: mikhail.ramalho, a.sidorin, szepet, xazax.hun.
Herald added a reviewer: george.karpenkov.

The loop-widening code processes c++ methods looking for `this` pointers.  In
the case of static methods (which do not have `this` pointers), an assertion
was triggering.   This patch avoids trying to process `this` pointers for
static methods, and thus avoids triggering the assertion .


https://reviews.llvm.org/D50408

Files:
  lib/StaticAnalyzer/Core/LoopWidening.cpp
  test/Analysis/loop-widening-ignore-static-methods.cpp


Index: test/Analysis/loop-widening-ignore-static-methods.cpp
===================================================================
--- test/Analysis/loop-widening-ignore-static-methods.cpp
+++ test/Analysis/loop-widening-ignore-static-methods.cpp
@@ -0,0 +1,12 @@
+// RUN: %clang_analyze_cc1 -analyzer-checker=core -analyzer-config widen-loops=true -analyzer-max-loop 2 %s
+// REQUIRES: asserts
+// expected-no-diagnostics
+//
+// This test checks that the loop-widening code ignores static methods.  If that is not the
+// case, then an assertion will trigger.
+
+class Test {
+  static void foo() {
+    for (;;) {}
+  }
+};
Index: lib/StaticAnalyzer/Core/LoopWidening.cpp
===================================================================
--- lib/StaticAnalyzer/Core/LoopWidening.cpp
+++ lib/StaticAnalyzer/Core/LoopWidening.cpp
@@ -81,8 +81,10 @@
 
   // 'this' pointer is not an lvalue, we should not invalidate it. If the loop
   // is located in a method, constructor or destructor, the value of 'this'
-  // pointer shoule remain unchanged.
-  if (const CXXMethodDecl *CXXMD = dyn_cast<CXXMethodDecl>(STC->getDecl())) {
+  // pointer should remain unchanged.  Ignore static methods, since they do not
+  // have 'this' pointers.
+  const CXXMethodDecl *CXXMD = dyn_cast<CXXMethodDecl>(STC->getDecl());
+  if (CXXMD && !CXXMD->isStatic()) {
     const CXXThisRegion *ThisR = MRMgr.getCXXThisRegion(
         CXXMD->getThisType(STC->getAnalysisDeclContext()->getASTContext()),
         STC);


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