[asan] Ease dealing with tagged enum ErrorDescription with some macros.

Summary:
Added a macro to enumerate the (error name, error member name) pairs. This way,
when adding an error, we only need to add the pair to one place (plus add its
implementation, or course).

Reviewers: kcc, samsonov

Subscribers: llvm-commits, kubabrecka

Differential Revision: https://reviews.llvm.org/D23875

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@281237 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 27 insertions, 32 deletions

diff --git a/lib/asan/asan_errors.h b/lib/asan/asan_errors.h
index afa96de4e..862b6653c 100644
--- a/lib/asan/asan_errors.h
+++ b/lib/asan/asan_errors.h
@@ -122,12 +122,25 @@ struct ErrorNewDeleteSizeMismatch : ErrorBase {
   void Print();
 };
 
+// clang-format off
+#define ASAN_FOR_EACH_ERROR_KIND(macro) \
+  macro(StackOverflow)                  \
+  macro(DeadlySignal)                   \
+  macro(DoubleFree)                     \
+  macro(NewDeleteSizeMismatch)
+// clang-format on
+
+#define ASAN_DEFINE_ERROR_KIND(name) kErrorKind##name,
+#define ASAN_ERROR_DESCRIPTION_MEMBER(name) Error##name name;
+#define ASAN_ERROR_DESCRIPTION_CONSTRUCTOR(name) \
+  ErrorDescription(Error##name const &e) : kind(kErrorKind##name), name(e) {}
+#define ASAN_ERROR_DESCRIPTION_PRINT(name) \
+  case kErrorKind##name:                   \
+    return name.Print();
+
 enum ErrorKind {
   kErrorKindInvalid = 0,
-  kErrorKindStackOverflow,
-  kErrorKindDeadlySignal,
-  kErrorKindDoubleFree,
-  kErrorKindNewDeleteSizeMismatch,
+  ASAN_FOR_EACH_ERROR_KIND(ASAN_DEFINE_ERROR_KIND)
 };
 
 struct ErrorDescription {
@@ -138,40 +151,16 @@ struct ErrorDescription {
   // We can add a wrapper around it to make it "more c++-like", but that would
   // add a lot of code and the benefit wouldn't be that big.
   union {
-    ErrorStackOverflow stack_overflow;
-    ErrorDeadlySignal deadly_signal;
-    ErrorDoubleFree double_free;
-    ErrorNewDeleteSizeMismatch new_delete_size_mismatch;
+    ASAN_FOR_EACH_ERROR_KIND(ASAN_ERROR_DESCRIPTION_MEMBER)
   };
+
   ErrorDescription() { internal_memset(this, 0, sizeof(*this)); }
-  ErrorDescription(const ErrorStackOverflow &e)  // NOLINT
-      : kind(kErrorKindStackOverflow),
-        stack_overflow(e) {}
-  ErrorDescription(const ErrorDeadlySignal &e)  // NOLINT
-      : kind(kErrorKindDeadlySignal),
-        deadly_signal(e) {}
-  ErrorDescription(const ErrorDoubleFree &e)  // NOLINT
-      : kind(kErrorKindDoubleFree),
-        double_free(e) {}
-  ErrorDescription(const ErrorNewDeleteSizeMismatch &e)  // NOLINT
-      : kind(kErrorKindNewDeleteSizeMismatch),
-        new_delete_size_mismatch(e) {}
+  ASAN_FOR_EACH_ERROR_KIND(ASAN_ERROR_DESCRIPTION_CONSTRUCTOR)
 
   bool IsValid() { return kind != kErrorKindInvalid; }
   void Print() {
     switch (kind) {
-      case kErrorKindStackOverflow:
-        stack_overflow.Print();
-        return;
-      case kErrorKindDeadlySignal:
-        deadly_signal.Print();
-        return;
-      case kErrorKindDoubleFree:
-        double_free.Print();
-        return;
-      case kErrorKindNewDeleteSizeMismatch:
-        new_delete_size_mismatch.Print();
-        return;
+      ASAN_FOR_EACH_ERROR_KIND(ASAN_ERROR_DESCRIPTION_PRINT)
       case kErrorKindInvalid:
         CHECK(0);
     }
@@ -179,6 +168,12 @@ struct ErrorDescription {
   }
 };
 
+#undef ASAN_FOR_EACH_ERROR_KIND
+#undef ASAN_DEFINE_ERROR_KIND
+#undef ASAN_ERROR_DESCRIPTION_MEMBER
+#undef ASAN_ERROR_DESCRIPTION_CONSTRUCTOR
+#undef ASAN_ERROR_DESCRIPTION_PRINT
+
 }  // namespace __asan
 
 #endif  // ASAN_ERRORS_H