Merge pull request #38896 from apple/revert-38746-objc-getclass-test

Revert "[Demangler][Tests] Add an explicit test for getObjCClassByMangledName."

include/swift/Demangling/TypeLookupError.h

@@ -207,10 +207,7 @@ template <typename... Args>
 static TypeLookupError TypeLookupErrorImpl(const char *fmt, Args... args) {
   return TypeLookupError([=] {
     char *str;
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wformat-security"
     swift_asprintf(&str, fmt, args...);
-#pragma clang diagnostic pop
     return str;
   });
 }

include/swift/Reflection/TypeRefBuilder.h

@@ -24,6 +24,7 @@
 #include "swift/Reflection/TypeLowering.h"
 #include "swift/Reflection/TypeRef.h"
 #include "llvm/ADT/Optional.h"
+
 #include <vector>
 #include <unordered_map>
 

lib/Demangling/Remangler.cpp

@@ -444,8 +444,6 @@ std::pair<int, Node *> Remangler::mangleConstrainedType(Node *node,
   
   if (node->getKind() != Node::Kind::DependentGenericParamType) {
     mangle(node, depth + 1);
-    if (!Chain.size())
-      return {-1, nullptr};
     node = nullptr;
   }
 

stdlib/public/runtime/Metadata.cpp

@@ -3490,17 +3490,13 @@ swift::swift_getExistentialMetatypeMetadata(const Metadata *instanceMetadata) {
 ExistentialMetatypeCacheEntry::ExistentialMetatypeCacheEntry(
                                             const Metadata *instanceMetadata) {
   ExistentialTypeFlags flags;
-  switch (instanceMetadata->getKind()) {
-  case MetadataKind::Existential:
+  if (instanceMetadata->getKind() == MetadataKind::Existential) {
     flags = static_cast<const ExistentialTypeMetadata*>(instanceMetadata)
       ->Flags;
-    break;
-  case MetadataKind::ExistentialMetatype:
+  } else {
+    assert(instanceMetadata->getKind() == MetadataKind::ExistentialMetatype);
     flags = static_cast<const ExistentialMetatypeMetadata*>(instanceMetadata)
       ->Flags;
-    break;
-  default:
-    assert(false && "expected existential metadata");
   }
 
   Data.setKind(MetadataKind::ExistentialMetatype);

stdlib/public/runtime/MetadataLookup.cpp

@@ -1446,12 +1446,6 @@ public:
   TypeLookupErrorOr<BuiltType> createExistentialMetatypeType(
       BuiltType instance,
       llvm::Optional<Demangle::ImplMetatypeRepresentation> repr = None) const {
-    if (instance->getKind() != MetadataKind::Existential
-        && instance->getKind() != MetadataKind::ExistentialMetatype) {
-      return TYPE_LOOKUP_ERROR_FMT("Tried to build an existential metatype from "
-                                   "a type that was neither an existential nor "
-                                   "an existential metatype");
-    }
     return swift_getExistentialMetatypeMetadata(instance);
   }
 

test/Demangle/Inputs/objc-getclass.txt

@@ -1,28 +0,0 @@
-# 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
-
-# rdar://63488139
-1_SxSt_S4KSgS9OSgRSLAPALÂ
-
-# rdar://63496478
-BwXp
-1TSpXpBOXp
-SJSJSFSrSJSKSKSKSKm_tmcXpXpStmcXpXpSE_tmcXpXpmcXpXpStmcXpXpSE_tmcXpBpXp!E_tXpXpStmcXpZpSE_tmcXpXpSE_tmc3
-x_xSx_SxTd_SySyyS6dyGˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBˇˇˇˇˇˇˇˇˇˇXpXpXpf:8–VSBP0
-
-# rdar://63410196
-SlSIxip6/XXS*”PLEPÓd}}}}}}}
-
-# rdar://68449341
-ySfmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmf%mmmmmmmmmmmmmf%w

test/Demangle/lit.local.cfg

@@ -1,3 +1,2 @@
 # suffixes: A list of file extensions to treat as test files.
 config.suffixes.add('.test')
-config.suffixes.add('.cpp')

test/Demangle/objc-getclass.cpp

@@ -1,84 +0,0 @@
-// RUN: %empty-directory(%t)
-// RUN: %target-clang %s -isysroot %sdk -L%swift_obj_root/lib/swift/%target-os-abi -lswiftCore -o %t/objc-getclass
-// RUN: %target-codesign %t/objc-getclass
-// RUN: %target-run %t/objc-getclass %S/Inputs/objc-getclass.txt
-
-// REQUIRES: executable_test
-// REQUIRES: objc_interop
-
-#include <objc/runtime.h>
-#include <dlfcn.h>
-#include <stdio.h>
-#include <ctype.h>
-#include <errno.h>
-#include <string.h>
-
-static BOOL dummyHook(const char * _Nonnull name,
-                      Class _Nullable * _Nonnull outClass) {
-  return NO;
-}
-
-int main(int argc, char **argv) {
-  if (argc != 2) {
-    fprintf(stderr, "usage: objc-getclass <input.txt>\n"
-            "\n"
-            "Test demangling class names to get classes.\n");
-    return 0;
-  }
-
-  // Find the class-by-mangled-name hook
-  objc_hook_getClass getObjCClassByMangledName = NULL;
-
-  if (__builtin_available(macOS 10.14.4, iOS 12.2, tvOS 12.2, watchOS 5.2, *)) {
-    objc_hook_getClass dummy = NULL;
-    objc_setHook_getClass(dummyHook, &getObjCClassByMangledName);
-    objc_setHook_getClass(getObjCClassByMangledName, &dummy);
-  } else {
-    fprintf(stderr, "objc-getclass: macOS version is too old\n");
-    return 1;
-  }
-
-  // Open the input file
-  FILE *fp = fopen(argv[1], "rt");
-  if (!fp) {
-    fprintf(stderr, "objc-getclass: unable to open \"%s\" - %s\n",
-            argv[1], strerror(errno));
-  }
-
-  // Input file is a list of manglings; we don't really care what classes they
-  // resolve to here; this test is about whether or not they actually crash or
-  // assert.
-  char *line = NULL;
-  size_t linecap = 0;
-  ssize_t linelen = 0;
-
-  while ((linelen = getline(&line, &linecap, fp)) > 0) {
-    char *mangling = line;
-
-    // Trim whitespace
-    while (isspace(*mangling))
-      ++mangling;
-
-    char *end = line + linelen;
-    while (end > line && isspace(end[-1]))
-      --end;
-    *end = '\0';
-
-    // Skip comments and blank lines
-    if (*mangling == '#' || !*mangling)
-      continue;
-
-    // Try to get a class
-    Class outClass = nil;
-    BOOL result = getObjCClassByMangledName(mangling, &outClass);
-
-    if (result)
-      printf("%s -> %s\n", mangling, class_getName(outClass));
-    else
-      printf("%s not found\n", mangling);
-  }
-
-  fclose(fp);
-
-  return 0;
-}