[LLVMbugs] [Bug 19653] New: assertion "GlobalAlias should not have a section!"

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19653

            Bug ID: 19653
           Summary: assertion "GlobalAlias should not have a section!"
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

An asserts build of clang fires an assert building tcmalloc. Testcase:

extern "C" {
 void tc_free() { }
 void tc_cfree() __attribute__((section("test")));
 void tc_cfree() __attribute__((alias("tc_free")));
}

LLVM has an assert that you aren't calling setSection on a GlobalAlias.

(gdb) run
Starting program: /usr/local/google/home/nlewycky/llvm/Debug+Asserts/bin/clang
-cc1 a.cc -emit-llvm-only
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/grte/v3/lib64/libthread_db.so.1".
clang: /usr/local/google/home/nlewycky/llvm/include/llvm/IR/GlobalValue.h:115:
void llvm::GlobalValue::setSection(llvm::StringRef): Assertion `(getValueID()
!= Value::GlobalAliasVal || S.empty()) && "GlobalAlias should not have a
section!"' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff6ced425 in __GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
64    ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007ffff6ced425 in __GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007ffff6cf0b8b in __GI_abort () at abort.c:91
#2  0x00007ffff6ce60ee in __assert_fail_base (fmt=<optimized out>,
assertion=0x3bd1238 "(getValueID() != Value::GlobalAliasVal || S.empty()) &&
\"GlobalAlias should not have a section!\"", 
    file=0x3bd11f0
"/usr/local/google/home/nlewycky/llvm/include/llvm/IR/GlobalValue.h",
line=<optimized out>, function=<optimized out>) at assert.c:94
#3  0x00007ffff6ce6192 in __GI___assert_fail (assertion=0x3bd1238
"(getValueID() != Value::GlobalAliasVal || S.empty()) && \"GlobalAlias should
not have a section!\"", 
    file=0x3bd11f0
"/usr/local/google/home/nlewycky/llvm/include/llvm/IR/GlobalValue.h", line=115, 
    function=0x3bd8cc0
<llvm::GlobalValue::setSection(llvm::StringRef)::__PRETTY_FUNCTION__> "void
llvm::GlobalValue::setSection(llvm::StringRef)") at assert.c:103
#4  0x0000000001327d24 in llvm::GlobalValue::setSection (this=0x61b2588, S=...)
at /usr/local/google/home/nlewycky/llvm/include/llvm/IR/GlobalValue.h:114
#5  0x000000000132c35a in clang::CodeGen::CodeGenModule::SetCommonAttributes
(this=0x61aafa0, D=0x61bfd10, GV=0x61b2588) at CodeGenModule.cpp:715
#6  0x0000000001331df0 in clang::CodeGen::CodeGenModule::EmitAliasDefinition
(this=0x61aafa0, GD=...) at CodeGenModule.cpp:2316
#7  0x000000000132e1f1 in clang::CodeGen::CodeGenModule::EmitGlobal
(this=0x61aafa0, GD=...) at CodeGenModule.cpp:1149
#8  0x0000000001334fa8 in clang::CodeGen::CodeGenModule::EmitTopLevelDecl
(this=0x61aafa0, D=0x61bfd10) at CodeGenModule.cpp:3015
#9  0x0000000001334e5b in clang::CodeGen::CodeGenModule::EmitLinkageSpec
(this=0x61aafa0, LSD=0x61754e0) at CodeGenModule.cpp:2996
#10 0x0000000001335465 in clang::CodeGen::CodeGenModule::EmitTopLevelDecl
(this=0x61aafa0, D=0x61754e0) at CodeGenModule.cpp:3119
#11 0x00000000012abfe8 in (anonymous
namespace)::CodeGeneratorImpl::HandleTopLevelDecl (this=0x6175b90, DG=...) at
ModuleBuilder.cpp:80
#12 0x00000000012a8222 in clang::BackendConsumer::HandleTopLevelDecl
(this=0x61759d0, D=...) at CodeGenAction.cpp:99
#13 0x000000000150aa55 in clang::ParseAST (S=..., PrintStats=false,
SkipFunctionBodies=false) at ParseAST.cpp:143
#14 0x00000000010119de in clang::ASTFrontendAction::ExecuteAction
(this=0x61440e0) at FrontendAction.cpp:487
#15 0x00000000012aa34c in clang::CodeGenAction::ExecuteAction (this=0x61440e0)
at CodeGenAction.cpp:611
#16 0x0000000001011513 in clang::FrontendAction::Execute (this=0x61440e0) at
FrontendAction.cpp:388
#17 0x0000000000fdf670 in clang::CompilerInstance::ExecuteAction
(this=0x6143360, Act=...) at CompilerInstance.cpp:727
#18 0x0000000000fa6800 in clang::ExecuteCompilerInvocation (Clang=0x6143360) at
ExecuteCompilerInvocation.cpp:239
#19 0x0000000000f94e3d in cc1_main (ArgBegin=0x7fffffffdd38,
ArgEnd=0x7fffffffdd48, Argv0=0x7fffffffeb71
"/usr/local/google/home/nlewycky/llvm/Debug+Asserts/bin/clang", 
    MainAddr=0xf9fefe <GetExecutablePath(char const*, bool)>) at
cc1_main.cpp:112
#20 0x0000000000fa13df in main (argc_=4, argv_=0x7fffffffe8f8) at
driver.cpp:319
(gdb)

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