Add get type analyzer method to C API (rust-lang#673)

* Add get type analyzer method to C API

* Add inverted phi type handler

Author: wsmoses

enzyme/Enzyme/CApi.cpp

@@ -227,6 +227,10 @@ void *EnzymeAnalyzeTypes(EnzymeTypeAnalysisRef TAR, CFnTypeInfo CTI,
   return (void *)&((TypeAnalysis *)TAR)->analyzeFunction(FTI).analyzer;
 }
 
+void *EnzymeGradientUtilsTypeAnalyzer(GradientUtils *G) {
+  return (void *)&G->my_TR->analyzer;
+}
+
 void EnzymeRegisterAllocationHandler(char *Name, CustomShadowAlloc AHandle,
                                      CustomShadowFree FHandle) {
   shadowHandlers[std::string(Name)] =

enzyme/Enzyme/EnzymeLogic.cpp

@@ -2728,6 +2728,13 @@ void createInvertedTerminator(TypeResults &TR, DiffeGradientUtils *gutils,
       }
     }
     if (!PNfloatType) {
+      if (CustomErrorHandler) {
+        std::string str;
+        raw_string_ostream ss(str);
+        ss << "Cannot deduce type of phi " << *orig;
+        CustomErrorHandler(str.c_str(), wrap(orig), ErrorType::NoType,
+                           &TR.analyzer);
+      }
       llvm::errs() << *gutils->oldFunc->getParent() << "\n";
       llvm::errs() << *gutils->oldFunc << "\n";
       llvm::errs() << " for orig " << *orig << " saw "