[PATCH] D78085: [AST] Fix recovery-expr crash on invalid aligned attr.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
hokein added a reviewer: sammccall.
Herald added a project: clang.

crash stack:

  lang: tools/clang/include/clang/AST/AttrImpl.inc:1490: unsigned int clang::AlignedAttr::getAlignment(clang::ASTContext &) const: Assertion `!isAlignmentDependent()' failed.
  PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
  Stack dump:
  0.      Program arguments: ./bin/clang -cc1 -std=c++1y -ast-dump -frecovery-ast -fcxx-exceptions /tmp/t4.cpp
  1.      /tmp/t4.cpp:3:31: current parser token ';'
   #0 0x0000000002530cff llvm::sys::PrintStackTrace(llvm::raw_ostream&) llvm-project/llvm/lib/Support/Unix/Signals.inc:564:13
   #1 0x000000000252ee30 llvm::sys::RunSignalHandlers() llvm-project/llvm/lib/Support/Signals.cpp:69:18
   #2 0x000000000253126c SignalHandler(int) llvm-project/llvm/lib/Support/Unix/Signals.inc:396:3
   #3 0x00007f86964d0520 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x13520)
   #4 0x00007f8695f9ff61 raise /build/glibc-oCLvUT/glibc-2.29/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
   #5 0x00007f8695f8b535 abort /build/glibc-oCLvUT/glibc-2.29/stdlib/abort.c:81:7
   #6 0x00007f8695f8b40f _nl_load_domain /build/glibc-oCLvUT/glibc-2.29/intl/loadmsgcat.c:1177:9
   #7 0x00007f8695f98b92 (/lib/x86_64-linux-gnu/libc.so.6+0x32b92)
   #8 0x0000000004503d9f llvm::APInt::getZExtValue() const llvm-project/llvm/include/llvm/ADT/APInt.h:1623:5
   #9 0x0000000004503d9f clang::AlignedAttr::getAlignment(clang::ASTContext&) const llvm-project/build/tools/clang/include/clang/AST/AttrImpl.inc:1492:0


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78085

Files:
  clang/lib/AST/DeclBase.cpp
  clang/test/AST/ast-dump-recovery.cpp
  clang/test/SemaCXX/invalid-aligned-attr.cpp


Index: clang/test/SemaCXX/invalid-aligned-attr.cpp
===================================================================
--- /dev/null
+++ clang/test/SemaCXX/invalid-aligned-attr.cpp
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -frecovery-ast -verify %s
+// RUN: %clang_cc1 -verify %s
+
+struct alignas(invalid()) Foo {}; // expected-error {{use of undeclared identifier}}
+
+constexpr int k = alignof(Foo);
Index: clang/test/AST/ast-dump-recovery.cpp
===================================================================
--- clang/test/AST/ast-dump-recovery.cpp
+++ clang/test/AST/ast-dump-recovery.cpp
@@ -97,4 +97,9 @@
 void test(int x) {
   foo.abc;
   foo->func(x);
-}
\ No newline at end of file
+}
+
+// CHECK:     |-AlignedAttr {{.*}} alignas
+// CHECK-NEXT:| `-RecoveryExpr {{.*}} contains-errors
+// CHECK-NEXT:|   `-UnresolvedLookupExpr {{.*}} 'invalid'
+struct alignas(invalid()) Aligned {};
Index: clang/lib/AST/DeclBase.cpp
===================================================================
--- clang/lib/AST/DeclBase.cpp
+++ clang/lib/AST/DeclBase.cpp
@@ -396,8 +396,10 @@
   const AttrVec &V = getAttrs();
   ASTContext &Ctx = getASTContext();
   specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end());
-  for (; I != E; ++I)
-    Align = std::max(Align, I->getAlignment(Ctx));
+  for (; I != E; ++I) {
+    if (!I->isAlignmentDependent())
+      Align = std::max(Align, I->getAlignment(Ctx));
+  }
   return Align;
 }
 


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