[Demangling] Improve DEMANGLE_ASSERT, enable some disabled tests.

Defining DEMANGLE_ASSERT as assert() is simple but messes up the file/line
information from assert().  Make a dedicated assertion failure function and use
that instead to fix.

Also enable some tests that were disabled because they triggered abort()
calls in the remanglers.

rdar://79725187

Author: al45tair

lib/Demangling/Demangler.cpp

@@ -15,10 +15,13 @@
 //===----------------------------------------------------------------------===//
 
 #include "swift/Demangling/Demangler.h"
-#include "swift/Demangling/ManglingUtils.h"
+#include "DemanglerAssert.h"
 #include "swift/Demangling/ManglingMacros.h"
+#include "swift/Demangling/ManglingUtils.h"
 #include "swift/Demangling/Punycode.h"
 #include "swift/Strings.h"
+#include <stdio.h>
+#include <stdlib.h>
 
 using namespace swift;
 using namespace Mangle;
@@ -87,6 +90,14 @@ static bool isRequirement(Node::Kind kind) {
 // Public utility functions    //
 //////////////////////////////////
 
+SWIFT_NORETURN void swift::Demangle::failAssert(const char *file, unsigned line,
+                                                NodePointer node,
+                                                const char *expr) {
+  fprintf(stderr, "%s:%u: assertion failed for Node %p: %s", file, line, node,
+          expr);
+  abort();
+}
+
 bool swift::Demangle::isContext(Node::Kind kind) {
   switch (kind) {
 #define NODE(ID)

lib/Demangling/DemanglerAssert.h

@@ -1,4 +1,4 @@
-//===--- DemanglerAssert.h - Assertions for de/re-mangling ----------------===//
+//===--- DemanglerAssert.h - Assertions for de/re-mangling ------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //
@@ -18,14 +18,43 @@
 #ifndef SWIFT_DEMANGLING_ASSERT_H
 #define SWIFT_DEMANGLING_ASSERT_H
 
+#include "swift/Demangling/Demangle.h"
+#include "swift/Demangling/NamespaceMacros.h"
+
 #if SWIFT_RUNTIME
+
+// In the runtime, DEMANGLER_ASSERT() returns an error
 #define DEMANGLER_ASSERT(expr, node)                                           \
   do {                                                                         \
     if (!(expr))                                                               \
       return ManglingError(ManglingError::AssertionFailed, (node), __LINE__);  \
   } while (0)
+
+#elif !defined(NDEBUG)
+
+// If NDEBUG is not defined, DEMANGLER_ASSERT() works like assert()
+#define DEMANGLER_ASSERT(expr, node)                                           \
+  do {                                                                         \
+    if (!(expr))                                                               \
+      swift::Demangle::failAssert(__FILE__, __LINE__, node, #expr);            \
+  } while (0)
+
 #else
-#define DEMANGLER_ASSERT(expr, node) assert(expr)
-#endif
+
+// Otherwise, DEMANGLER_ASSERT() does nothing
+#define DEMANGLER_ASSERT(expr, node)
+
+#endif // SWIFT_RUNTIME
+
+namespace swift {
+namespace Demangle {
+SWIFT_BEGIN_INLINE_NAMESPACE
+
+SWIFT_NORETURN void failAssert(const char *file, unsigned line,
+                               NodePointer node, const char *expr);
+
+SWIFT_END_INLINE_NAMESPACE
+} // end namespace Demangle
+} // end namespace swift
 
 #endif // SWIFT_DEMANGLING_ASSERT_H

test/Demangle/Inputs/objc-getclass.txt

@@ -1,16 +1,13 @@
 # These were found by fuzzing getObjCClassByMangledName
 
 # rdar://63485806
-# This results in an abort(), whereas it should be an error; rdar://79725187
-# covers improving error handling; until that's done, disable this test case
-
-# 3…KySSyGSkySySSGiG3(KˇˇˇˇˇˇˇˇˇˇˇˇˇˇCwKySSiKySS
-# SSmSySyySGGSGyGSyySyySySSGGSGyS78iSLccSGSyySSySSGGccLcV1yVS~^§!zzzzzzzzzzzzhzzzzzSLzSEzzzzzzzzzzzzzzzzzxxxxx8K_S0ttnIx4_
-# ˇyySySyySySyGnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnSgZ1laSgSg
-# SSx3…KySyySGSSG_S2ItLHPˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇMd7KLPlKSSFTc•OSgS
-# 3…KySSiGSeySySSGiGSiySySSGiG3(KˇˇˇˇˇˇˇˇˇˇˇˇˇˇCwKySSiKySS
-# 3…KySSiGSyySySSGiG3(KˇˇˇˇˇˇˇˇˇˇˇˇˇˇCwKySSiKySS
-# SyySyySSySyyGSyySyyGGSGyGSyySySyySySSGGSGGˇˇˇˇˇS4S_SmˇˇAGmmmmmmmmmtLHPL(LHPTVdLHV
+3…KySSyGSkySySSGiG3(KˇˇˇˇˇˇˇˇˇˇˇˇˇˇCwKySSiKySS
+SSmSySyySGGSGyGSyySyySySSGGSGyS78iSLccSGSyySSySSGGccLcV1yVS~^§!zzzzzzzzzzzzhzzzzzSLzSEzzzzzzzzzzzzzzzzzxxxxx8K_S0ttnIx4_
+ˇyySySyySySyGnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnSgZ1laSgSg
+SSx3…KySyySGSSG_S2ItLHPˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇMd7KLPlKSSFTc•OSgS
+3…KySSiGSeySySSGiGSiySySSGiG3(KˇˇˇˇˇˇˇˇˇˇˇˇˇˇCwKySSiKySS
+3…KySSiGSyySySSGiG3(KˇˇˇˇˇˇˇˇˇˇˇˇˇˇCwKySSiKySS
+SyySyySSySyyGSyySyyGGSGyGSyySySyySySSGGSGGˇˇˇˇˇS4S_SmˇˇAGmmmmmmmmmtLHPL(LHPTVdLHV
 
 # rdar://63488139
 1_SxSt_S4KSgS9OSgRSLAPALÂ