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

[Vitaly Buka 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)
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vitalybuka wrote:

into `compiler-rt/lib/rtsan/rtsan_assertions.h` ?
Looks like unnecessary exposure of implementation details. 

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