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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 --- - crash in -Wimplicit-fallthrough"
href="http://llvm.org/bugs/show_bug.cgi?id=18983">18983</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>crash in -Wimplicit-fallthrough
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nlewycky@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>kremenek@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>A crash was introduced sometime today. This only crashes with
-Wimplicit-fallthrough enabled.
Testcase:
void fatal() __attribute__((noreturn));
int num();
void test() {
switch (num()) {
case 1:
fatal();
case 2:
break;
}
}
$ clang -Wimplicit-fallthrough -std=c++11 a.cc
0 clang 0x00000000034a687b llvm::sys::PrintStackTrace(_IO_FILE*) +
38
1 clang 0x00000000034a6af8
2 clang 0x00000000034a6561
3 libpthread.so.0 0x00007f4341bfacb0
4 clang 0x00000000016f212a
5 clang 0x00000000016f5801
6 clang 0x00000000016f5feb
7 clang 0x00000000016f9baf
clang::sema::AnalysisBasedWarnings::IssueWarnings(clang::sema::AnalysisBasedWarnings::Policy,
clang::sema::FunctionScopeInfo*, clang::Decl const*, clang::BlockExpr const*) +
2579
8 clang 0x000000000125ec78
clang::Sema::PopFunctionScopeInfo(clang::sema::AnalysisBasedWarnings::Policy
const*, clang::Decl const*, clang::BlockExpr const*) + 150
9 clang 0x0000000001316066
clang::Sema::ActOnFinishFunctionBody(clang::Decl*, clang::Stmt*, bool) + 3644
10 clang 0x0000000001315227
clang::Sema::ActOnFinishFunctionBody(clang::Decl*, clang::Stmt*) + 45
11 clang 0x0000000001223b1c
clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&) + 502
12 clang 0x00000000011bb14e
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) +
3052
13 clang 0x00000000011cc02a
clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, unsigned int, bool,
clang::SourceLocation*, clang::Parser::ForRangeInit*) + 538
14 clang 0x00000000011ba289
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier) + 1211
15 clang 0x00000000011ba36e
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) + 174
16 clang 0x00000000011b9a96
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) + 2770
17 clang 0x00000000011b8f79
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&) + 535
18 clang 0x00000000011b29f8 clang::ParseAST(clang::Sema&, bool, bool)
+ 609
19 clang 0x0000000000d27f00 clang::ASTFrontendAction::ExecuteAction()
+ 322
20 clang 0x0000000000fa064d clang::CodeGenAction::ExecuteAction() +
1221
21 clang 0x0000000000d27a33 clang::FrontendAction::Execute() + 205
22 clang 0x0000000000cfa74c
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 720
23 clang 0x0000000000cc7c30
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1074
24 clang 0x0000000000cb95d9 cc1_main(char const**, char const**, char
const*, void*) + 636
25 clang 0x0000000000cc3724 main + 770
26 libc.so.6 0x00007f4340f1d76d __libc_start_main + 237
27 clang 0x0000000000cb7ca9
Stack dump:
0. Program arguments:
/usr/local/google/home/nlewycky/llvm/Debug+Asserts/bin/clang -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name
a.cc -mrelocation-model static -mdisable-fp-elim -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version
2.23.52.20130808 -resource-dir
/usr/local/google/home/nlewycky/llvm/Debug+Asserts/bin/../lib/clang/3.5
-internal-isystem /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/x86_64-linux-gnu
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/backward
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/x86_64-linux-gnu/c++/4.6
-internal-isystem /usr/local/include -internal-isystem
/usr/local/google/home/nlewycky/llvm/Debug+Asserts/bin/../lib/clang/3.5/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-Wimplicit-fallthrough -std=c++11 -fdeprecated-macro -fdebug-compilation-dir
/usr/local/google/home/nlewycky -ferror-limit 19 -fmessage-length 244
-mstackrealign -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-slp -o /tmp/a-bd3938.o
-x c++ a.cc
1. <eof> parser at end of file
2. a.cc:3:13: parsing function body 'test'
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.5 (trunk 202330)
Target: x86_64-unknown-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/a-976042.cpp
clang: note: diagnostic msg: /tmp/a-976042.sh
clang: note: diagnostic msg:
********************</pre>
</div>
</p>
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