Add explicit CFG support for ignoring static_asserts.

llvm-svn: 132001

clang/lib/Analysis/CFG.cpp

@@ -1323,6 +1323,7 @@ CFGBlock *CFGBuilder::VisitDeclStmt(DeclStmt *DS) {
   if (isa<LabelDecl>(*DS->decl_begin()))
     return Block;
   
+  // This case also handles static_asserts.
   if (DS->isSingleDecl())
     return VisitDeclSubExpr(DS);
 
@@ -1355,7 +1356,14 @@ CFGBlock *CFGBuilder::VisitDeclStmt(DeclStmt *DS) {
 /// DeclStmts and initializers in them.
 CFGBlock *CFGBuilder::VisitDeclSubExpr(DeclStmt* DS) {
   assert(DS->isSingleDecl() && "Can handle single declarations only.");
-
+  Decl *D = DS->getSingleDecl();
+ 
+  if (isa<StaticAssertDecl>(D)) {
+    // static_asserts aren't added to the CFG because they do not impact
+    // runtime semantics.
+    return Block;
+  }
+  
   VarDecl *VD = dyn_cast<VarDecl>(DS->getSingleDecl());
 
   if (!VD) {

clang/test/Analysis/misc-ps-cxx0x.cpp

@@ -0,0 +1,11 @@
+// RUN: %clang --analyze -std=c++0x %s -Xclang -verify
+
+void test_static_assert() {
+  static_assert(sizeof(void *) == sizeof(void*), "test_static_assert");
+}
+
+void test_analyzer_working() {
+  int *p = 0;
+  *p = 0xDEADBEEF; // expected-warning {{null}}
+}
+