[cfe-dev] A problem about builtin-type creation

[Reid Kleckner]

It is asserting that the Type pointer is not 16 byte aligned. Types are
generally constructed and uniqued in an ASTContext, which guarantees this
alignment.  See this at the top of Type.h:
  enum {
    TypeAlignmentInBits = 4,
    TypeAlignment = 1 << TypeAlignmentInBits
  };

Presumably you are building 32-bit code, where the system malloc returns 8
byte aligned chunks.


On Tue, Aug 5, 2014 at 10:11 AM, peterlee <peterlee at cs.utah.edu> wrote:

> Dear All,
>
> I am using Clang/LLVM-3.3, at present, I am fixing an error about creating
> a builtin type, the code is supposed to
> generate a "boolean" type with the following code:
>
> clang::Type* bool_type = new clang::BuiltinType(clang::BuiltinType::Bool);
> params.push_back(klimt::NamedDecl(clang::QualType(bool_type, 0), pname));
>
> I always encountered the error:
>
> /home/xxx/vendor/llvm-3.3/build32/Release+Asserts/../../include/llvm/ADT/PointerIntPair.h:100:
> void llvm::PointerIntPair<PointerTy, IntBits, IntType,
> PtrTraits>::initWithPointer(PointerTy) [with PointerTy = void*; unsigned
> int IntBits = 1u; IntType = bool; PtrTraits = llvm::PointerUnionUIntTraits<const
> clang::Type*, const clang::ExtQuals*>]: Assertion `(PtrWord & ((1 <<
> PtrTraits::NumLowBitsAvailable)-1)) == 0 && "Pointer is not sufficiently
> aligned"' failed
>
> The assertion fails at the BuiltinType creation.
>
> Any thoughts about how to fix this error is highly appreciated!
>
> Thanks
> Peng
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