[compiler-rt] [rtsan] Support basic call stack suppressions (PR #111608)

[via llvm-commits]

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@@ -0,0 +1,93 @@
+//===--- rtsan_suppressions.cpp - Realtime Sanitizer ------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of the RTSan runtime, providing support for suppressions
+//
+//===----------------------------------------------------------------------===//
+
+#include "rtsan/rtsan_suppressions.h"
+
+#include "rtsan/rtsan_flags.h"
+
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_internal_defs.h"
+#include "sanitizer_common/sanitizer_suppressions.h"
+#include "sanitizer_common/sanitizer_symbolizer.h"
+
+#include <new>
+
+using namespace __sanitizer;
+using namespace __rtsan;
+
+namespace {
+enum class ErrorType {
+#define RTSAN_CHECK(Name, FSanitizeFlagName) Name,
+#include "rtsan_checks.inc"
+#undef RTSAN_CHECK
+};
+} // namespace
+
+alignas(64) static char suppression_placeholder[sizeof(SuppressionContext)];
+static SuppressionContext *suppression_ctx = nullptr;
+
+static const char *kSuppressionTypes[] = {
+#define RTSAN_CHECK(Name, FSanitizeFlagName) FSanitizeFlagName,
+#include "rtsan_checks.inc"
+#undef RTSAN_CHECK
+};
+
+static const char *ConvertTypeToFlagName(ErrorType Type) {
+  switch (Type) {
+#define RTSAN_CHECK(Name, FSanitizeFlagName)                                   \
+  case ErrorType::Name:                                                        \
+    return FSanitizeFlagName;
+#include "rtsan_checks.inc"
+#undef RTSAN_CHECK
+  }
+  UNREACHABLE("unknown ErrorType!");
+}
+
+void __rtsan::InitializeSuppressions() {
+  CHECK_EQ(nullptr, suppression_ctx);
+
+  // We will use suppression_ctx == nullptr as an early out
+  if (flags().suppressions[0] == '\0')
+    return;
+
+  suppression_ctx = new (suppression_placeholder)
+      SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
+  suppression_ctx->ParseFromFile(flags().suppressions);
+}
+
+bool __rtsan::IsStackTraceSuppressed(const StackTrace &stack) {
+  if (suppression_ctx == nullptr)
----------------
davidtrevelyan wrote:

No problem - I don't feel strongly about this. I was originally anticipating that there would need to be more decision making at the assertion level that would have to take into account whether suppressions are active. But I've sketched it out locally and I don't think it's necessary. I'd be happy for my suggested change here to be reverted @cjappl 

https://github.com/llvm/llvm-project/pull/111608