1 files changed, 75 insertions, 0 deletions
diff --git a/lib/ubsan/ubsan_monitor.cpp b/lib/ubsan/ubsan_monitor.cpp
new file mode 100644
index 000000000000..d064e95f76f7
--- /dev/null
+++ b/lib/ubsan/ubsan_monitor.cpp
@@ -0,0 +1,75 @@
+//===-- ubsan_monitor.cpp ---------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Hooks which allow a monitor process to inspect UBSan's diagnostics.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ubsan_monitor.h"
+
+using namespace __ubsan;
+
+UndefinedBehaviorReport::UndefinedBehaviorReport(const char *IssueKind,
+                                                 Location &Loc,
+                                                 InternalScopedString &Msg)
+    : IssueKind(IssueKind), Loc(Loc), Buffer(Msg.length() + 1) {
+  // We have the common sanitizer reporting lock, so it's safe to register a
+  // new UB report.
+  RegisterUndefinedBehaviorReport(this);
+
+  // Make a copy of the diagnostic.
+  Buffer.append("%s", Msg.data());
+
+  // Let the monitor know that a report is available.
+  __ubsan_on_report();
+}
+
+static UndefinedBehaviorReport *CurrentUBR;
+
+void __ubsan::RegisterUndefinedBehaviorReport(UndefinedBehaviorReport *UBR) {
+  CurrentUBR = UBR;
+}
+
+SANITIZER_WEAK_DEFAULT_IMPL
+void __ubsan::__ubsan_on_report(void) {}
+
+void __ubsan::__ubsan_get_current_report_data(const char **OutIssueKind,
+                                              const char **OutMessage,
+                                              const char **OutFilename,
+                                              unsigned *OutLine,
+                                              unsigned *OutCol,
+                                              char **OutMemoryAddr) {
+  if (!OutIssueKind || !OutMessage || !OutFilename || !OutLine || !OutCol ||
+      !OutMemoryAddr)
+    UNREACHABLE("Invalid arguments passed to __ubsan_get_current_report_data");
+
+  InternalScopedString &Buf = CurrentUBR->Buffer;
+
+  // Ensure that the first character of the diagnostic text can't start with a
+  // lowercase letter.
+  char FirstChar = Buf.data()[0];
+  if (FirstChar >= 'a' && FirstChar <= 'z')
+    Buf.data()[0] = FirstChar - 'a' + 'A';
+
+  *OutIssueKind = CurrentUBR->IssueKind;
+  *OutMessage = Buf.data();
+  if (!CurrentUBR->Loc.isSourceLocation()) {
+    *OutFilename = "<unknown>";
+    *OutLine = *OutCol = 0;
+  } else {
+    SourceLocation SL = CurrentUBR->Loc.getSourceLocation();
+    *OutFilename = SL.getFilename();
+    *OutLine = SL.getLine();
+    *OutCol = SL.getColumn();
+  }
+
+  if (CurrentUBR->Loc.isMemoryLocation())
+    *OutMemoryAddr = (char *)CurrentUBR->Loc.getMemoryLocation();
+  else
+    *OutMemoryAddr = nullptr;
+}