Implement faux-body-synthesis of well-known functions in the static analyzer when

their implementations are unavailable.  Start by simulating dispatch_sync().

This change is largely a bunch of plumbing around something very simple.  We
use AnalysisDeclContext to conjure up a fake function body (using the
current ASTContext) when one does not exist.  This is controlled
under the analyzer-config option "faux-bodies", which is off by default.

The plumbing in this patch is largely to pass the necessary machinery
around.  CallEvent needs the AnalysisDeclContextManager to get
the function definition, as one may get conjured up lazily.

BugReporter and PathDiagnosticLocation needed to be relaxed to handle
invalid locations, as the conjured body has no real source locations.
We do some primitive recovery in diagnostic generation to generate
some reasonable locations (for arrows and events), but it can be
improved.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164339 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 9 deletions

diff --git a/lib/StaticAnalyzer/Core/CallEvent.cpp b/lib/StaticAnalyzer/Core/CallEvent.cpp
index 3b4c13471b..3743871361 100644
--- a/lib/StaticAnalyzer/Core/CallEvent.cpp
+++ b/lib/StaticAnalyzer/Core/CallEvent.cpp
@@ -414,7 +414,7 @@ SVal CXXInstanceCall::getCXXThisVal() const {
 }
 
 
-RuntimeDefinition CXXInstanceCall::getRuntimeDefinition() const {
+RuntimeDefinition CXXInstanceCall::getRuntimeDefinition(AnalysisDeclContextManager &M) const {
   // Do we have a decl at all?
   const Decl *D = getDecl();
   if (!D)
@@ -423,7 +423,7 @@ RuntimeDefinition CXXInstanceCall::getRuntimeDefinition() const {
   // If the method is non-virtual, we know we can inline it.
   const CXXMethodDecl *MD = cast<CXXMethodDecl>(D);
   if (!MD->isVirtual())
-    return AnyFunctionCall::getRuntimeDefinition();
+    return AnyFunctionCall::getRuntimeDefinition(M);
 
   // Do we know the implicit 'this' object being called?
   const MemRegion *R = getCXXThisVal().getAsRegion();
@@ -513,16 +513,16 @@ const Expr *CXXMemberCall::getCXXThisExpr() const {
   return getOriginExpr()->getImplicitObjectArgument();
 }
 
-RuntimeDefinition CXXMemberCall::getRuntimeDefinition() const {
+RuntimeDefinition CXXMemberCall::getRuntimeDefinition(AnalysisDeclContextManager &M) const {
   // C++11 [expr.call]p1: ...If the selected function is non-virtual, or if the
   // id-expression in the class member access expression is a qualified-id,
   // that function is called. Otherwise, its final overrider in the dynamic type
   // of the object expression is called.
   if (const MemberExpr *ME = dyn_cast<MemberExpr>(getOriginExpr()->getCallee()))
     if (ME->hasQualifier())
-      return AnyFunctionCall::getRuntimeDefinition();
+      return AnyFunctionCall::getRuntimeDefinition(M);
   
-  return CXXInstanceCall::getRuntimeDefinition();
+  return CXXInstanceCall::getRuntimeDefinition(M);
 }
 
 
@@ -600,13 +600,13 @@ SVal CXXDestructorCall::getCXXThisVal() const {
   return UnknownVal();
 }
 
-RuntimeDefinition CXXDestructorCall::getRuntimeDefinition() const {
+RuntimeDefinition CXXDestructorCall::getRuntimeDefinition(AnalysisDeclContextManager &M) const {
   // Base destructors are always called non-virtually.
   // Skip CXXInstanceCall's devirtualization logic in this case.
   if (isBaseDestructor())
-    return AnyFunctionCall::getRuntimeDefinition();
+    return AnyFunctionCall::getRuntimeDefinition(M);
 
-  return CXXInstanceCall::getRuntimeDefinition();
+  return CXXInstanceCall::getRuntimeDefinition(M);
 }
 
 
@@ -790,7 +790,7 @@ bool ObjCMethodCall::canBeOverridenInSubclass(ObjCInterfaceDecl *IDecl,
   llvm_unreachable("The while loop should always terminate.");
 }
 
-RuntimeDefinition ObjCMethodCall::getRuntimeDefinition() const {
+RuntimeDefinition ObjCMethodCall::getRuntimeDefinition(AnalysisDeclContextManager &M) const {
   const ObjCMessageExpr *E = getOriginExpr();
   assert(E);
   Selector Sel = E->getSelector();