Support for instrumenting only selected files or functions

This change implements support for applying profile instrumentation
only to selected files or functions. The implementation uses the
sanitizer special case list format to select which files and functions
to instrument, and relies on the new noprofile IR attribute to exclude
functions from instrumentation.

Differential Revision: https://reviews.llvm.org/D94820

clang/lib/CodeGen/CodeGenModule.cpp

@@ -2563,6 +2563,34 @@ bool CodeGenModule::imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
   return true;
 }
 
+bool CodeGenModule::isProfileInstrExcluded(llvm::Function *Fn,
+                                           SourceLocation Loc) const {
+  const auto &ProfileList = getContext().getProfileList();
+  // If the profile list is empty, then instrument everything.
+  if (ProfileList.isEmpty())
+    return false;
+  CodeGenOptions::ProfileInstrKind Kind = getCodeGenOpts().getProfileInstr();
+  // First, check the function name.
+  Optional<bool> V = ProfileList.isFunctionExcluded(Fn->getName(), Kind);
+  if (V.hasValue())
+    return *V;
+  // Next, check the source location.
+  if (Loc.isValid()) {
+    Optional<bool> V = ProfileList.isLocationExcluded(Loc, Kind);
+    if (V.hasValue())
+      return *V;
+  }
+  // If location is unknown, this may be a compiler-generated function. Assume
+  // it's located in the main file.
+  auto &SM = Context.getSourceManager();
+  if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
+    Optional<bool> V = ProfileList.isFileExcluded(MainFile->getName(), Kind);
+    if (V.hasValue())
+      return *V;
+  }
+  return ProfileList.getDefault();
+}
+
 bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
   // Never defer when EmitAllDecls is specified.
   if (LangOpts.EmitAllDecls)