[LLVMbugs] [Bug 16144] New: Misaligned stores in clang/AST/TypeLoc.h

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16144

            Bug ID: 16144
           Summary: Misaligned stores in clang/AST/TypeLoc.h
           Product: clang
           Version: trunk
          Hardware: Sun
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: stoklund at 2pi.dk
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Clang is crashing on sparc64, and probably on other 64-bit architectures that
aren't x86-64 because of misaligned stores in TypeLoc.h.

The problem can be reproduced on x86-64 by building with -fsanitize=alignment:


********************
FAIL: Clang :: CodeGen/avx-builtins.c (1309 of 6324)
******************** TEST 'Clang :: CodeGen/avx-builtins.c' FAILED
********************
Script:
--
/d/b/Release+Asserts/bin/clang -cc1 -internal-isystem
/d/b/Release+Asserts/bin/../lib/clang/3.4/include
/d/g/clang/test/CodeGen/avx-builtins.c -O3 -triple=x86_64-apple-darwin
-target-feature +avx -emit-llvm -o - | FileCheck
/d/g/clang/test/CodeGen/avx-builtins.c
--
Exit Code: 2
Command Output (stderr):
--
/d/g/llvm/tools/clang/lib/Sema/../../include/clang/AST/TypeLoc.h:1558:27:
runtime error: member access within misaligned address 0x7fca5a89e054 for type
'clang::ElaboratedLocInfo', which requires 8 byte alignment
0x7fca5a89e054: note: pointer points here
  fa 99 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00
              ^ 
/d/g/llvm/tools/clang/lib/Serialization/../../include/clang/AST/TypeLoc.h:1570:21:
runtime error: member access within misaligned address 0x7fca5a89e054 for type
'clang::ElaboratedLocInfo', which requires 8 byte alignment
0x7fca5a89e054: note: pointer points here
  fa 99 00 00 df 99 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00
              ^ 
/d/g/llvm/tools/clang/lib/Serialization/../../include/clang/AST/TypeLoc.h:1570:21:
runtime error: store to misaligned address 0x7fca5a89e05c for type 'void *',
which requires 8 byte alignment
0x7fca5a89e05c: note: pointer points here
  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00
              ^ 
/d/g/llvm/tools/clang/lib/AST/../../include/clang/AST/TypeLoc.h:1555:34:
runtime error: member access within misaligned address 0x7fca5a89e054 for type
'clang::ElaboratedLocInfo', which requires 8 byte alignment
0x7fca5a89e054: note: pointer points here
  fa 99 00 00 df 99 00 00  00 00 00 00 00 00 00 00  00 00 00 00 e6 99 00 00  00
00 00 00 00 00 00 00
              ^ 
/d/g/llvm/tools/clang/lib/ARCMigrate/../../include/clang/AST/TypeLoc.h:1563:51:
runtime error: member access within misaligned address 0x7fca5a89e054 for type
'clang::ElaboratedLocInfo', which requires 8 byte alignment
0x7fca5a89e054: note: pointer points here
  fa 99 00 00 df 99 00 00  00 00 00 00 00 00 00 00  00 00 00 00 e6 99 00 00  00
00 00 00 00 00 00 00
              ^ 
/d/g/llvm/tools/clang/lib/ARCMigrate/../../include/clang/AST/TypeLoc.h:1563:51:
runtime error: load of misaligned address 0x7fca5a89e05c for type 'void *',
which requires 8 byte alignment
0x7fca5a89e05c: note: pointer points here
  00 00 00 00 00 00 00 00  00 00 00 00 e6 99 00 00  00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00
              ^ 
/d/g/llvm/include/llvm/Support/ValueHandle.h:195:12: runtime error: downcast of
misaligned address 0xfffffffffffffffc for type 'llvm::BasicBlock', which
requires 8 byte alignment
0xfffffffffffffffc: note: pointer points here
0  clang             0x00000001069f8da8 llvm::sys::PrintStackTrace(__sFILE*) +
40
1  clang             0x00000001069f9285 SignalHandler(int) + 341
2  libsystem_c.dylib 0x00007fff8f24f94a _sigtramp + 26
3  libsystem_c.dylib 0x0000000000000001 _sigtramp + 1893402321
Stack dump:
0.    Program arguments: /d/b/Release+Asserts/bin/clang -cc1 -internal-isystem
/d/b/Release+Asserts/bin/../lib/clang/3.4/include
/d/g/clang/test/CodeGen/avx-builtins.c -O3 -triple=x86_64-apple-darwin
-target-feature +avx -emit-llvm -o - 
1.    <eof> parser at end of file
2.    Per-module optimization passes
3.    Running pass 'CallGraph Pass Manager' on module
'/d/g/clang/test/CodeGen/avx-builtins.c'.
4.    Running pass 'Value Propagation' on function '@_mm256_loadu_ps'
FileCheck error: '-' is empty.

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