[LLVMbugs] [Bug 21232] New: Assertion in CGClass.cpp: Bad field alignment

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Oct 9 17:07:37 PDT 2014


            Bug ID: 21232
           Summary: Assertion in CGClass.cpp: Bad field alignment
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: warren_ristow at playstation.sony.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following volatile bitfield test-case:

// ================ test.cpp ================
struct BB {
  virtual void d();
  volatile char e : 8;
  char f : 1;
  char g;

BB i() {
  static BB j;
  return j;
// ==========================================

hits an assertion-failure:

$ clang++ --version
clang version 3.6.0 (trunk 219414)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ clang++ -c -O0 test.cpp
clang: .../llvm/tools/clang/lib/CodeGen/CGClass.cpp:831:
  void {anonymous}::FieldMemcpyizer::emitMemcpy(): Assertion
  `(CGF.getContext().toCharUnitsFromBits(FirstFieldOffset) % Alignment) == 0
          && "Bad field alignment."' failed.

In experiments, significantly older versions (Clang 3.2 based) compiled it
without error.

The problem was found on an x86_64 target, but also tested with '-target ppu',
and it failed the same way.

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