[FunC] Add an ability to deprecate pragmas

crypto/func/func.cpp

@@ -77,6 +77,37 @@ bool SymValCodeFunc::does_need_codegen() const {
   // in the future, we may want to implement a true AST inlining for `inline` functions also
 }
 
+void GlobalPragma::enable(SrcLocation loc) {
+  if (deprecated_from_v_) {
+    loc.show_warning(PSTRING() << "#pragma " << name_ <<
+                     " is deprecated since FunC v" << deprecated_from_v_ <<
+                     ". Please, remove this line from your code.");
+    return;
+  }
+
+  enabled_ = true;
+  locs_.push_back(std::move(loc));
+}
+
+void GlobalPragma::check_enable_in_libs() {
+  if (locs_.empty()) {
+    return;
+  }
+  for (const SrcLocation& loc : locs_) {
+    if (loc.fdescr->is_main) {
+      return;
+    }
+  }
+  locs_[0].show_warning(PSTRING() << "#pragma " << name_
+                        << " is enabled in included libraries, it may change the behavior of your code. "
+                        << "Add this #pragma to the main source file to suppress this warning.");
+}
+
+void GlobalPragma::always_on_and_deprecated(const char *deprecated_from_v) {
+  deprecated_from_v_ = deprecated_from_v;
+  enabled_ = true;
+}
+
 td::Result<std::string> fs_read_callback(ReadCallback::Kind kind, const char* query) {
   switch (kind) {
     case ReadCallback::Kind::ReadFile: {

crypto/func/func.h

@@ -1769,27 +1769,14 @@ class GlobalPragma {
   bool enabled() const {
     return enabled_;
   }
-  void enable(SrcLocation loc) {
+  void enable(SrcLocation loc);
-    enabled_ = true;
+  void check_enable_in_libs();
-    locs_.push_back(std::move(loc));
+  void always_on_and_deprecated(const char *deprecated_from_v);
-  }
-  void check_enable_in_libs() {
-    if (locs_.empty()) {
-      return;
-    }
-    for (const SrcLocation& loc : locs_) {
-      if (loc.fdescr->is_main) {
-        return;
-      }
-    }
-    locs_[0].show_warning(PSTRING() << "#pragma " << name_
-                                    << " is enabled in included libraries, it may change the behavior of your code. "
-                                    << "Add this #pragma to the main source file to suppress this warning.");
-  }
 
  private:
   std::string name_;
   bool enabled_ = false;
+  const char *deprecated_from_v_ = nullptr;
   std::vector<SrcLocation> locs_;
 };
 extern GlobalPragma pragma_allow_post_modification, pragma_compute_asm_ltr, pragma_remove_unused_functions;