http://llvm.org/bugs/show_bug.cgi?id=13606
Bug #: 13606
Summary: Clang crashes with large alignment attribute
Product: clang
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 9055
--> http://llvm.org/bugs/attachment.cgi?id=9055
C source code to reproduce problem based on code from Baozeng
When using an alignment of 0x100000 on a global variable (see attached test
case), Clang asserts out with the following error:
clang: /home/criswell/src/llvm-trunk/tools/clang/lib/CodeGen/CGValue.h:162:
void clang::CodeGen::LValue::Initialize(clang::QualType, clang::Qualifiers,
clang::CharUnits, llvm::MDNode*): Assertion `this->Alignment ==
Alignment.getQuantity() && "Alignment exceeds allowed max!"' failed.
The problem appears to be that an LValue can only have an alignment that fits
within a short; increasing the data type size to a long will fix the problem.
This bug appears in both Clang 3.1 and Clang mainline (pre Clang 3.2).
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