Start reifying error descriptions. Second try: Try to appease Visual Studio.

Summary:
This commit sets up the infrastructure to use reified error
descriptions, and moves ReportStackOverflow to the new system.

After we convert all the errors, we'll be able to simplify ScopedInErrorReport
and remove the older debugging mechanism which had some errors partly reified
in some way. We'll be able to maintain the external API.

ScopedInErrorReport will be able to track one of the reified errors at a time.
The purpose of this is so we have its destructor actually print the error and
possibly interface with the debugger (will depend on the platform, of course).

Reviewers: kcc, samsonov, timurrrr

Subscribers: kubabrecka, llvm-commits

Differential Revision: https://reviews.llvm.org/D23672

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@279931 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 74 insertions, 0 deletions

diff --git a/lib/asan/asan_errors.h b/lib/asan/asan_errors.h
new file mode 100644
index 000000000..fdcf088fd
--- /dev/null
+++ b/lib/asan/asan_errors.h
@@ -0,0 +1,74 @@
+//===-- asan_errors.h -------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// ASan-private header for error structures.
+//===----------------------------------------------------------------------===//
+#ifndef ASAN_ERRORS_H
+#define ASAN_ERRORS_H
+
+#include "asan_descriptions.h"
+#include "asan_scariness_score.h"
+
+namespace __asan {
+
+struct ErrorBase {
+  ScarinessScore scariness;
+};
+
+struct ErrorStackOverflow : ErrorBase {
+  u32 tid;
+  uptr addr, pc, bp, sp;
+  // ErrorStackOverflow never owns the context.
+  void *context;
+  ErrorStackOverflow() = default;
+  ErrorStackOverflow(const SignalContext &sig, u32 tid_)
+      : tid(tid_),
+        addr(sig.addr),
+        pc(sig.pc),
+        bp(sig.bp),
+        sp(sig.sp),
+        context(sig.context) {
+    scariness.Scare(10, "stack-overflow");
+  }
+  void Print();
+};
+
+enum ErrorKind {
+  kErrorKindInvalid = 0,
+  kErrorKindStackOverflow,
+};
+
+struct ErrorDescription {
+  ErrorKind kind;
+  union {
+    ErrorStackOverflow stack_overflow;
+  };
+  ErrorDescription() { internal_memset(this, 0, sizeof(*this)); }
+  ErrorDescription(const ErrorStackOverflow &e)  // NOLINT
+      : kind(kErrorKindStackOverflow),
+        stack_overflow(e) {}
+
+  bool IsValid() { return kind != kErrorKindInvalid; }
+  void Print() {
+    switch (kind) {
+      case kErrorKindStackOverflow:
+        stack_overflow.Print();
+        return;
+      case kErrorKindInvalid:
+        CHECK(0);
+    }
+    CHECK(0);
+  }
+};
+
+}  // namespace __asan
+
+#endif  // ASAN_ERRORS_H