[analyzer] Add some convenience accessors to CallEvent, and use them.

These are CallEvent-equivalents of helpers already accessible in
CheckerContext, as part of making it easier for new checkers to be written
using CallEvent rather than raw CallExprs.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@167338 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/StaticAnalyzer/Core/CallEvent.cpp b/lib/StaticAnalyzer/Core/CallEvent.cpp
index b1e2d78183..c5cb317bd1 100644
--- a/lib/StaticAnalyzer/Core/CallEvent.cpp
+++ b/lib/StaticAnalyzer/Core/CallEvent.cpp
@@ -14,6 +14,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
 #include "clang/Analysis/ProgramPoint.h"
 #include "clang/AST/ParentMap.h"
 #include "llvm/ADT/SmallSet.h"
@@ -99,6 +100,14 @@ bool CallEvent::hasNonZeroCallbackArg() const {
   return false;
 }
 
+bool CallEvent::isGlobalCFunction(StringRef FunctionName) const {
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(getDecl());
+  if (!FD)
+    return false;
+
+  return CheckerContext::isCLibraryFunction(FD, FunctionName);
+}
+
 /// \brief Returns true if a type is a pointer-to-const or reference-to-const
 /// with no further indirection.
 static bool isPointerToConst(QualType Ty) {
@@ -223,6 +232,13 @@ SourceRange CallEvent::getArgSourceRange(unsigned Index) const {
   return ArgE->getSourceRange();
 }
 
+SVal CallEvent::getReturnValue() const {
+  const Expr *E = getOriginExpr();
+  if (!E)
+    return UndefinedVal();
+  return getSVal(E);
+}
+
 void CallEvent::dump() const {
   dump(llvm::errs());
 }