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<base href="https://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 --- - Crash in CodeGen when processing default switch statement"
href="https://llvm.org/bugs/show_bug.cgi?id=28609">28609</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Crash in CodeGen when processing default switch statement
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rtrieu@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat small.c
void fn1() {
switch (0)
case 0:
do {
default:
;
} while (0)
;
}
$ clang small.c
1. <eof> parser at end of file
2. small.c:1:6: LLVM IR generation of declaration 'fn1'
3. small.c:1:6: Generating code for declaration 'fn1'
4. small.c:4:6: LLVM IR generation of compound statement ('{}')
Backtrace:
#3 clang::CodeGen::CodeGenFunction::EmitDefaultStmt(clang::DefaultStmt const&)
#4 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*)
#5 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*)
#6
clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot)
#7 clang::CodeGen::CodeGenFunction::EmitCompoundStmt(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot)
#8 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*)
#9 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*)
It looks like Clang was attempting to run CodeGen on a default statement. But
when it attempted to find the related switch statement, it got a null pointer
instead and segfaulted. Located at #3, CGStmt.cpp:1264, SwitchInsn is null.</pre>
</div>
</p>
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