[cfe-dev] clang CRASH parsing c++11 literal operator

Kal Conley kcconley at gmail.com
Mon Jan 14 06:57:45 PST 2013


Heads up!
Its easy to crash clang 3.2 with this input:

template<...>
int operator"" _b();
int main() { return 0_b; }

Output:

user-defined-literals-crash.cc:1:13: error: expected template parameter
template<...>
            ^
user-defined-literals-crash.cc:2:5: error: no function template matches
function template specialization 'operator "" _b'
int operator"" _b();
    ^
0  clang           0x00000000019ede2f
1  clang           0x00000000019ee2182  libpthread.so.0 0x00007f9266cfc030
3  clang           0x0000000000a8ab27
clang::Sema::LookupLiteralOperator(clang::Scope*, clang::LookupResult&,
llvm::ArrayRef<clang::QualType>, bool) + 151
4  clang           0x0000000000a02953
clang::Sema::ActOnNumericConstant(clang::Token const&, clang::Scope*) + 851
5  clang           0x00000000008c61f3
clang::Parser::ParseCastExpression(bool, bool, bool&,
clang::Parser::TypeCastState) + 259
6  clang           0x00000000008c3876
clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) + 118
7  clang           0x00000000008c37ec
clang::Parser::ParseExpression(clang::Parser::TypeCastState) + 12
8  clang           0x00000000008ef3dc
clang::Parser::ParseReturnStatement() + 412
9  clang           0x00000000008eafa2
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, bool, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&) + 1618
10 clang           0x00000000008ea8ea
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, bool, clang::SourceLocation*) + 154
11 clang           0x00000000008f0b59
clang::Parser::ParseCompoundStatementBody(bool) + 569
12 clang           0x00000000008f2951
clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&) + 161
13 clang           0x000000000089cc88
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&,
clang::Parser::LateParsedAttrList*) + 2440
14 clang           0x00000000008a9002
clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, unsigned int,
bool, clang::SourceLocation*, clang::Parser::ForRangeInit*) + 1442
15 clang           0x000000000089c2ef
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier) + 831
16 clang           0x000000000089bd61
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) + 241
17 clang           0x000000000089b485
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) + 2357
18 clang           0x000000000089aaca
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
+ 314
19 clang           0x0000000000897bc6 clang::ParseAST(clang::Sema&,
bool, bool) + 326
20 clang           0x0000000000795694
clang::CodeGenAction::ExecuteAction() + 996
21 clang           0x0000000000664823 clang::FrontendAction::Execute() + 83
22 clang           0x000000000064ae3d
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 909
23 clang           0x0000000000634842
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 3602
24 clang           0x000000000062c53b cc1_main(char const**, char
const**, char const*, void*) + 795
25 clang           0x00000000006308c8 main + 696
26 libc.so.6       0x00007f9265dd1ead __libc_start_main + 253
27 clang           0x000000000062c159
Stack dump:
0.      Program arguments: /opt/bin/clang -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
-disable-llvm-verifier -main-file-name user-defined-literals-crash.cc
-mrelocation-model static -mdisable-fp-elim -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu
x86-64 -target-linker-version 2.22 -momit-leaf-frame-pointer
-resource-dir /opt/bin/../lib/clang/3.2 -fmodule-cache-path
/var/tmp/clang-module-cache -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../include/c++/4.7
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../include/c++/4.7/x86_64-linux-gnu
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../include/c++/4.7/backward
-internal-isystem /usr/local/include -internal-isystem
/opt/bin/../lib/clang/3.2/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 /home/kal/devel/user-defined-literals
-ferror-limit 19 -fmessage-length 190 -mstackrealign -fobjc-runtime=gcc
-fcxx-exceptions -fexceptions -fdiagnostics-show-option
-fcolor-diagnostics -o /tmp/user-defined-literals-crash-jccQn7.o -x c++
user-defined-literals-crash.cc
1.      user-defined-literals-crash.cc:3:21: current parser token '0_b'
2.      user-defined-literals-crash.cc:3:12: parsing function body 'main'
3.      user-defined-literals-crash.cc:3:12: 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 3.2 (tags/RELEASE_32/final 170703)
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/user-defined-literals-crash-izTAuB.cpp
clang: note: diagnostic msg: /tmp/user-defined-literals-crash-izTAuB.sh
clang: note: diagnostic msg:

********************




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