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<head>
<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LICM.cpp:882: possible use of NULL pointer"
href="http://llvm.org/bugs/show_bug.cgi?id=19941">19941</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LICM.cpp:882: possible use of NULL pointer
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dcb314@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12604" name="attach_12604" title="C source code">attachment 12604</a> <a href="attachment.cgi?id=12604&action=edit" title="C source code">[details]</a></span>
C source code
I recently compiled the attached code with llvm
trunk dated 20140604 with compiler flag -O2 under valgrind
and it said
==8278== Invalid read of size 8
==8278== at 0x2497E60: llvm::BasicBlock::getTerminator() (ilist.h:386)
==8278== by 0x210F9CB: (anonymous
namespace)::LICM::PromoteAliasSet(llvm::Ali
asSet&, llvm::SmallVectorImpl<llvm::BasicBlock*>&,
llvm::SmallVectorImpl<llvm::I
nstruction*>&, llvm::PredIteratorCache&) (LICM.cpp:882)
==8278== by 0x2111383: (anonymous namespace)::LICM::runOnLoop(llvm::Loop*,
ll
vm::LPPassManager&) (LICM.cpp:299)
==8278== by 0x234FA32: llvm::LPPassManager::runOnFunction(llvm::Function&)
(L
oopPass.cpp:235)
==8278== by 0x2560518: llvm::FPPassManager::runOnFunction(llvm::Function&)
(L
egacyPassManager.cpp:1545)
==8278== by 0x22AA470: (anonymous
namespace)::CGPassManager::runOnModule(llvm
::Module&) (CallGraphSCCPass.cpp:151)
==8278== by 0x2560DB7: llvm::legacy::PassManagerImpl::run(llvm::Module&)
(Leg
acyPassManager.cpp:1623)
==8278== by 0x8AF30F: clang::EmitBackendOutput(clang::DiagnosticsEngine&,
cla
ng::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const
&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*)
(Ba
ckendUtil.cpp:589)
==8278== by 0x8A7B16:
clang::BackendConsumer::HandleTranslationUnit(clang::AS
TContext&) (CodeGenAction.cpp:176)
==8278== by 0xA59FC4: clang::ParseAST(clang::Sema&, bool, bool)
(ParseAST.cpp
:154)
==8278== by 0x8A7EBA: clang::CodeGenAction::ExecuteAction()
(CodeGenAction.cp
p:676)
==8278== by 0x712385: clang::FrontendAction::Execute()
(FrontendAction.cpp:41
5)
==8278== Address 0x40 is not stack'd, malloc'd or (recently) free'd
LICM.cpp:882 is
LoadInst *PreheaderLoad =
new LoadInst(SomePtr, SomePtr->getName()+".promoted",
Preheader->getTerminator());
so it looks to me like Preheader is NULL.</pre>
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