[LLVMbugs] [Bug 21531] New: crash on parameter pack in switch case
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Tue Nov 11 09:46:34 PST 2014
http://llvm.org/bugs/show_bug.cgi?id=21531
Bug ID: 21531
Summary: crash on parameter pack in switch case
Product: clang
Version: 3.5
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangbugs at nondot.org
Reporter: rhainin1 at binghamton.edu
CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
Classification: Unclassified
Created attachment 13318
--> http://llvm.org/bugs/attachment.cgi?id=13318&action=edit
cpp post-processed
When using a parameter pack in a switch case (invalid code). clang crashes.
The code to produce:
template <int... Is>
int f(int i) {
switch (i) {
case Is:
return 0;
}
}
int main() {
f<1,2,3>(1);
}
The backtrace:
expandcase.cpp:4:14: error: expression contains unexpanded parameter pack 'Is'
case Is:
^~
0 clang 0x00000000026f1cd2 llvm::sys::PrintStackTrace(_IO_FILE*) +
34
1 clang 0x00000000026f1574
2 libpthread.so.0 0x00007fb841892030
3 clang 0x0000000000fadf5f
clang::Sema::ActOnFinishSwitchStmt(clang::SourceLocation, clang::Stmt*,
clang::Stmt*) + 847
4 clang 0x0000000000d26b98
clang::Parser::ParseSwitchStatement(clang::SourceLocation*) + 536
5 clang 0x0000000000d2452b
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, bool, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&)
+ 2075
6 clang 0x0000000000d24a98
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, bool, clang::SourceLocation*) + 120
7 clang 0x0000000000d27a66
clang::Parser::ParseCompoundStatementBody(bool) + 1846
8 clang 0x0000000000d29b46
clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&) + 198
9 clang 0x0000000000cc3abd
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) +
1277
10 clang 0x0000000000d34da7
clang::Parser::ParseSingleDeclarationAfterTemplate(unsigned int,
clang::Parser::ParsedTemplateInfo const&, clang::ParsingDeclRAIIObject&,
clang::SourceLocation&, clang::AccessSpecifier, clang::AttributeList*) + 3831
11 clang 0x0000000000d35a53
clang::Parser::ParseTemplateDeclarationOrSpecialization(unsigned int,
clang::SourceLocation&, clang::AccessSpecifier, clang::AttributeList*) + 963
12 clang 0x0000000000d35cfa
clang::Parser::ParseDeclarationStartingWithTemplate(unsigned int,
clang::SourceLocation&, clang::AccessSpecifier, clang::AttributeList*) + 138
13 clang 0x0000000000cdbf14
clang::Parser::ParseDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, unsigned
int, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&) + 612
14 clang 0x0000000000cc4cb1
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) + 337
15 clang 0x0000000000cc5390
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&) + 448
16 clang 0x0000000000cbcac0 clang::ParseAST(clang::Sema&, bool, bool)
+ 400
17 clang 0x0000000000b3102b clang::CodeGenAction::ExecuteAction() +
59
18 clang 0x00000000009a2d26 clang::FrontendAction::Execute() + 118
19 clang 0x000000000097db70
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 320
20 clang 0x0000000000966b63
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2115
21 clang 0x0000000000960118 cc1_main(char const**, char const**, char
const*, void*) + 1384
22 clang 0x000000000093a962 main + 1362
23 libc.so.6 0x00007fb840746ead __libc_start_main + 253
24 clang 0x000000000095f4ed
Stack dump:
0. Program arguments:
/import/linux/home/kchiu/packages/linux-x86_64/llvm-3.5.0/bin/clang -cc1
-triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
-main-file-name expandcase.cpp -mrelocation-model static -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu x86-64 -target-linker-version 2.24
-dwarf-column-info -resource-dir
/import/linux/home/kchiu/packages/linux-x86_64/llvm-3.5.0/bin/../lib/clang/3.5.0
-internal-isystem
/home/kchiu/packages/linux-x86_64/gcc-4.9.1/lib/gcc/x86_64-unknown-linux-gnu/4.9.1/../../../../include/c++/4.9.1
-internal-isystem
/home/kchiu/packages/linux-x86_64/gcc-4.9.1/lib/gcc/x86_64-unknown-linux-gnu/4.9.1/../../../../include/c++/4.9.1/x86_64-unknown-linux-gnu
-internal-isystem
/home/kchiu/packages/linux-x86_64/gcc-4.9.1/lib/gcc/x86_64-unknown-linux-gnu/4.9.1/../../../../include/c++/4.9.1/backward
-internal-isystem /usr/local/include -internal-isystem
/import/linux/home/kchiu/packages/linux-x86_64/llvm-3.5.0/bin/../lib/clang/3.5.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-std=c++11 -fdeprecated-macro -fdebug-compilation-dir
/import/linux/home/rhainin1 -ferror-limit 19 -fmessage-length 0 -mstackrealign
-fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -o
/tmp/expandcase-03aba5.o -x c++ expandcase.cpp
1. expandcase.cpp:7:1: current parser token '}'
2. expandcase.cpp:2:14: parsing function body 'f'
3. expandcase.cpp:2:14: in compound statement ('{}')
clang: error: unable to execute command: Segmentation fault
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.5.0 (tags/RELEASE_350/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ 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/expandcase-365a30.cpp
clang: note: diagnostic msg: /tmp/expandcase-365a30.sh
clang: note: diagnostic msg:
********************
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