[PATCH 4/4] libsanitizer: Readd __ubsan_handle_function_type_mismatch_v1{,_abort}

[Jakub Jelinek <jakub@redhat.com>]

Hi!

So that we don't have to bump libubsan.so.1 SONAME, the following patch
reverts part of the changes which removed two handlers.  While we don't
actually use them from GCC, we shouldn't remove supported entrypoints
unless SONAME is changed (removal of __interceptor_* or ___interceptor_*
is fine).  This is the only removal, other libraries just added some
symbols.

2023-11-15  Jakub Jelinek  <jakub@redhat.com>

	* ubsan/ubsan_handlers_cxx.h (FunctionTypeMismatchData): Forward
	declare.
	(__ubsan_handle_function_type_mismatch_v1,
	__ubsan_handle_function_type_mismatch_v1_abort): Declare.
	* ubsan/ubsan_handlers_cxx.cpp (handleFunctionTypeMismatch,
	__ubsan_handle_function_type_mismatch_v1,
	__ubsan_handle_function_type_mismatch_v1_abort): New functions readded
	for backwards compatibility from older ubsan.
	* ubsan/ubsan_interface.inc (__ubsan_handle_function_type_mismatch_v1,
	__ubsan_handle_function_type_mismatch_v1_abort): Readd.

--- libsanitizer/ubsan/ubsan_handlers_cxx.h.jj	2023-11-14 23:52:59.417503473 +0100
+++ libsanitizer/ubsan/ubsan_handlers_cxx.h	2023-11-15 11:36:34.961739772 +0100
@@ -33,6 +33,19 @@ void __ubsan_handle_dynamic_type_cache_m
 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 void __ubsan_handle_dynamic_type_cache_miss_abort(
   DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash);
+
+struct FunctionTypeMismatchData;
+
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE void
+__ubsan_handle_function_type_mismatch_v1(FunctionTypeMismatchData *Data,
+                                         ValueHandle Val,
+                                         ValueHandle calleeRTTI,
+                                         ValueHandle fnRTTI);
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE void
+__ubsan_handle_function_type_mismatch_v1_abort(FunctionTypeMismatchData *Data,
+                                               ValueHandle Val,
+                                               ValueHandle calleeRTTI,
+                                               ValueHandle fnRTTI);
 }
 
 #endif // UBSAN_HANDLERS_CXX_H
--- libsanitizer/ubsan/ubsan_handlers_cxx.cpp.jj	2023-11-14 23:52:59.417503473 +0100
+++ libsanitizer/ubsan/ubsan_handlers_cxx.cpp	2023-11-15 11:31:56.241672876 +0100
@@ -156,6 +156,50 @@ void __ubsan_handle_cfi_bad_type(CFIChec
     Diag(Loc, DL_Note, ET, "check failed in %0, vtable located in %1")
         << SrcModule << DstModule;
 }
+
+static bool handleFunctionTypeMismatch(FunctionTypeMismatchData *Data,
+                                       ValueHandle Function,
+                                       ValueHandle calleeRTTI,
+                                       ValueHandle fnRTTI, ReportOptions Opts) {
+  if (checkTypeInfoEquality(reinterpret_cast<void *>(calleeRTTI),
+                            reinterpret_cast<void *>(fnRTTI)))
+    return false;
+
+  SourceLocation CallLoc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::FunctionTypeMismatch;
+
+  if (ignoreReport(CallLoc, Opts, ET))
+    return true;
+
+  ScopedReport R(Opts, CallLoc, ET);
+
+  SymbolizedStackHolder FLoc(getSymbolizedLocation(Function));
+  const char *FName = FLoc.get()->info.function;
+  if (!FName)
+    FName = "(unknown)";
+
+  Diag(CallLoc, DL_Error, ET,
+       "call to function %0 through pointer to incorrect function type %1")
+      << FName << Data->Type;
+  Diag(FLoc, DL_Note, ET, "%0 defined here") << FName;
+  return true;
+}
+
+void __ubsan_handle_function_type_mismatch_v1(FunctionTypeMismatchData *Data,
+                                              ValueHandle Function,
+                                              ValueHandle calleeRTTI,
+                                              ValueHandle fnRTTI) {
+  GET_REPORT_OPTIONS(false);
+  handleFunctionTypeMismatch(Data, Function, calleeRTTI, fnRTTI, Opts);
+}
+
+void __ubsan_handle_function_type_mismatch_v1_abort(
+    FunctionTypeMismatchData *Data, ValueHandle Function,
+    ValueHandle calleeRTTI, ValueHandle fnRTTI) {
+  GET_REPORT_OPTIONS(true);
+  if (handleFunctionTypeMismatch(Data, Function, calleeRTTI, fnRTTI, Opts))
+    Die();
+}
 }  // namespace __ubsan
 
 #endif // CAN_SANITIZE_UB
--- libsanitizer/ubsan/ubsan_interface.inc.jj	2023-11-14 23:52:59.417503473 +0100
+++ libsanitizer/ubsan/ubsan_interface.inc	2023-11-15 11:32:57.430809418 +0100
@@ -21,6 +21,8 @@ INTERFACE_FUNCTION(__ubsan_handle_dynami
 INTERFACE_FUNCTION(__ubsan_handle_dynamic_type_cache_miss_abort)
 INTERFACE_FUNCTION(__ubsan_handle_float_cast_overflow)
 INTERFACE_FUNCTION(__ubsan_handle_float_cast_overflow_abort)
+INTERFACE_FUNCTION(__ubsan_handle_function_type_mismatch_v1)
+INTERFACE_FUNCTION(__ubsan_handle_function_type_mismatch_v1_abort)
 INTERFACE_FUNCTION(__ubsan_handle_function_type_mismatch)
 INTERFACE_FUNCTION(__ubsan_handle_function_type_mismatch_abort)
 INTERFACE_FUNCTION(__ubsan_handle_implicit_conversion)

	Jakub