Add some more asserts to clearly indicate that there are special cases

which guarantee pointers are not null. These all seem to have useful
properties and correlations to document, in one case we even had it in
a comment but now it will also be an assert.

This should prevent PVS-Studio from incorrectly claiming that there are
a bunch of potential bugs here. But I feel really strongly that the
PVS-Studio warnings that pointed at this code have a far too high
false-positive rate to be entirely useful. These are just places where
there did seem to be a useful invariant to document and verify with an
assert. Several other places in the code were already correct and
already have perfectly clear code documenting and validating their
invariants, but still ran afoul of PVS-Studio.

llvm-svn: 285985

clang/lib/AST/Expr.cpp

@@ -561,6 +561,7 @@ std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) {
       FT = dyn_cast<FunctionProtoType>(AFT);
 
     if (IT == FuncSig) {
+      assert(FT && "We must have a written prototype in this case.");
       switch (FT->getCallConv()) {
       case CC_C: POut << "__cdecl "; break;
       case CC_X86StdCall: POut << "__stdcall "; break;

clang/lib/Basic/IdentifierTable.cpp

@@ -443,9 +443,11 @@ std::string Selector::getAsString() const {
   if (getIdentifierInfoFlag() < MultiArg) {
     IdentifierInfo *II = getAsIdentifierInfo();
 
-    // If the number of arguments is 0 then II is guaranteed to not be null.
-    if (getNumArgs() == 0)
+    if (getNumArgs() == 0) {
+      assert(II && "If the number of arguments is 0 then II is guaranteed to "
+                   "not be null.");
       return II->getName();
+    }
 
     if (!II)
       return ":";

clang/lib/Lex/HeaderSearch.cpp

@@ -36,9 +36,12 @@ using namespace clang;
 const IdentifierInfo *
 HeaderFileInfo::getControllingMacro(ExternalPreprocessorSource *External) {
   if (ControllingMacro) {
-    if (ControllingMacro->isOutOfDate())
+    if (ControllingMacro->isOutOfDate()) {
+      assert(External && "We must have an external source if we have a "
+                         "controlling macro that is out of date.");
       External->updateOutOfDateIdentifier(
           *const_cast<IdentifierInfo *>(ControllingMacro));
+    }
     return ControllingMacro;
   }