Take another crack at stabilizing the emission order of analyzer

diagnostics without using FoldingSetNodeIDs.  This is done
by doing a complete recursive comparison of the PathDiagnostics.

Note that the previous method of comparing FoldingSetNodeIDs did
not end up relying on unstable things such as pointer addresses, so
I suspect this may still have some issues on various buildbots because
I'm not sure if the true source of non-determinism has been eliminated.
The tests pass for me, so the only way to know is to commit this change
and see what happens.

llvm-svn: 163489

clang/lib/StaticAnalyzer/Core/PathDiagnostic.cpp

@@ -199,6 +199,7 @@ void PathDiagnosticConsumer::HandlePathDiagnostic(PathDiagnostic *D) {
     if (orig_size <= new_size)
       return;
 
+    assert(orig != D);
     Diags.RemoveNode(orig);
     delete orig;
   }
@@ -206,22 +207,145 @@ void PathDiagnosticConsumer::HandlePathDiagnostic(PathDiagnostic *D) {
   Diags.InsertNode(OwningD.take());
 }
 
+static llvm::Optional<bool> comparePath(const PathPieces &X,
+                                        const PathPieces &Y);
+static llvm::Optional<bool>
+compareControlFlow(const PathDiagnosticControlFlowPiece &X,
+                   const PathDiagnosticControlFlowPiece &Y) {
+  FullSourceLoc XSL = X.getStartLocation().asLocation();
+  FullSourceLoc YSL = Y.getStartLocation().asLocation();
+  if (XSL != YSL)
+    return XSL < YSL;
+  FullSourceLoc XEL = X.getStartLocation().asLocation();
+  FullSourceLoc YEL = Y.getStartLocation().asLocation();
+  if (XEL != YEL)
+    return XEL < YEL;
+  return llvm::Optional<bool>();
+}
+
+static llvm::Optional<bool>
+compareMacro(const PathDiagnosticMacroPiece &X,
+             const PathDiagnosticMacroPiece &Y) {
+  return comparePath(X.subPieces, Y.subPieces);
+}
+
+static llvm::Optional<bool>
+compareCall(const PathDiagnosticCallPiece &X,
+            const PathDiagnosticCallPiece &Y) {
+  FullSourceLoc X_CEL = X.callEnter.asLocation();
+  FullSourceLoc Y_CEL = Y.callEnter.asLocation();
+  if (X_CEL != Y_CEL)
+    return X_CEL < Y_CEL;
+  FullSourceLoc X_CEWL = X.callEnterWithin.asLocation();
+  FullSourceLoc Y_CEWL = Y.callEnterWithin.asLocation();
+  if (X_CEWL != Y_CEWL)
+    return X_CEWL < Y_CEWL;
+  FullSourceLoc X_CRL = X.callReturn.asLocation();
+  FullSourceLoc Y_CRL = Y.callReturn.asLocation();
+  if (X_CRL != Y_CRL)
+    return X_CRL < Y_CRL;
+  return comparePath(X.path, Y.path);
+}
+
+static llvm::Optional<bool> comparePiece(const PathDiagnosticPiece &X,
+                                         const PathDiagnosticPiece &Y) {
+  if (X.getKind() != Y.getKind())
+    return X.getKind() < Y.getKind();
+  
+  FullSourceLoc XL = X.getLocation().asLocation();
+  FullSourceLoc YL = Y.getLocation().asLocation();
+  if (XL != YL)
+    return XL < YL;
+
+  if (X.getString() != Y.getString())
+    return X.getString() < Y.getString();
+
+  if (X.getRanges().size() != Y.getRanges().size())
+    return X.getRanges().size() < Y.getRanges().size();
+
+  for (unsigned i = 0, n = X.getRanges().size(); i < n; ++i) {
+    SourceRange XR = X.getRanges()[i];
+    SourceRange YR = Y.getRanges()[i];
+    if (XR != YR) {
+      if (XR.getBegin() != YR.getBegin())
+        return XR.getBegin() < YR.getBegin();
+      return XR.getEnd() < YR.getEnd();
+    }
+  }
+  
+  switch (X.getKind()) {
+    case clang::ento::PathDiagnosticPiece::ControlFlow:
+      return compareControlFlow(cast<PathDiagnosticControlFlowPiece>(X),
+                                cast<PathDiagnosticControlFlowPiece>(Y));
+    case clang::ento::PathDiagnosticPiece::Event:
+      return llvm::Optional<bool>();
+    case clang::ento::PathDiagnosticPiece::Macro:
+      return compareMacro(cast<PathDiagnosticMacroPiece>(X),
+                          cast<PathDiagnosticMacroPiece>(Y));
+    case clang::ento::PathDiagnosticPiece::Call:
+      return compareCall(cast<PathDiagnosticCallPiece>(X),
+                         cast<PathDiagnosticCallPiece>(Y));
+  }
+  llvm_unreachable("all cases handled");
+}
+
+static llvm::Optional<bool> comparePath(const PathPieces &X,
+                                        const PathPieces &Y) {
+  if (X.size() != Y.size())
+    return X.size() < Y.size();
+  for (unsigned i = 0, n = X.size(); i != n; ++i) {
+    llvm::Optional<bool> b = comparePiece(*X[i], *Y[i]);
+    if (b.hasValue())
+      return b.getValue();
+  }
+  return llvm::Optional<bool>();
+}
+
+static bool compare(const PathDiagnostic &X, const PathDiagnostic &Y) {
+  FullSourceLoc XL = X.getLocation().asLocation();
+  FullSourceLoc YL = Y.getLocation().asLocation();
+  if (XL != YL)
+    return XL < YL;
+  if (X.getBugType() != Y.getBugType())
+    return X.getBugType() < Y.getBugType();
+  if (X.getCategory() != Y.getCategory())
+    return X.getCategory() < Y.getCategory();
+  if (X.getVerboseDescription() != Y.getVerboseDescription())
+    return X.getVerboseDescription() < Y.getVerboseDescription();
+  if (X.getShortDescription() != Y.getShortDescription())
+    return X.getShortDescription() < Y.getShortDescription();
+  if (X.getDeclWithIssue() != Y.getDeclWithIssue()) {
+    const Decl *XD = X.getDeclWithIssue();
+    if (!XD)
+      return true;
+    const Decl *YD = Y.getDeclWithIssue();
+    if (!YD)
+      return false;
+    SourceLocation XDL = XD->getLocation();
+    SourceLocation YDL = YD->getLocation();
+    if (XDL != YDL)
+      return XDL < YDL;
+  }
+  PathDiagnostic::meta_iterator XI = X.meta_begin(), XE = X.meta_end();
+  PathDiagnostic::meta_iterator YI = Y.meta_begin(), YE = Y.meta_end();
+  if (XE - XI != YE - YI)
+    return (XE - XI) < (YE - YI);
+  for ( ; XI != XE ; ++XI, ++YI) {
+    if (*XI != *YI)
+      return (*XI) < (*YI);
+  }
+  llvm::Optional<bool> b = comparePath(X.path, Y.path);
+  assert(b.hasValue());
+  return b.getValue();
+}
 
 namespace {
 struct CompareDiagnostics {
   // Compare if 'X' is "<" than 'Y'.
   bool operator()(const PathDiagnostic *X, const PathDiagnostic *Y) const {
-    // First sort by location, and if that doesn't work, do a full profile.
-    FullSourceLoc XL = X->getLocation().asLocation();
-    FullSourceLoc YL = Y->getLocation().asLocation();
-    if (XL != YL)
-      return XL < YL;
-    
-    // Do a full profile.
-    llvm::FoldingSetNodeID XProfile, YProfile;
-    X->FullProfile(XProfile);
-    Y->FullProfile(YProfile);
-    return XProfile < YProfile;
+    if (X == Y)
+      return false;
+    return compare(*X, *Y);
   }
 };
 }