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[clang] Assertion `!isTokenSpecial() && "Should consume special tokens with Consume*Token"' failed. #113722

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yijan4845 opened this issue Oct 25, 2024 · 2 comments · Fixed by #139595
Closed

[clang] Assertion `!isTokenSpecial() && "Should consume special tokens with Consume*Token"' failed. #113722

yijan4845 opened this issue Oct 25, 2024 · 2 comments · Fixed by #139595
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clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash-on-invalid generated by fuzzer

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@yijan4845
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This testcase is generated by a fuzzer.

Compiler Explorer: https://godbolt.org/z/9EEEefGbT

This invalid code will crash on Clang Assertion Trunk:

struct S {
  void m(int x = 0,
#pragma message "Any message") {
    int z = 0;
    #pragma unused(x)
  }
};

It seems that this goes back to clang-5.

Stack dump:

clang++: /root/llvm-project/clang/include/clang/Parse/Parser.h:549: clang::SourceLocation clang::Parser::ConsumeToken(): Assertion `!isTokenSpecial() && "Should consume special tokens with Consume*Token"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.	<source>:5:13: at annotation token
2.	<source>:1:1: parsing struct/union/class body 'S'
 #0 0x0000000003bcced8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bcced8)
 #1 0x0000000003bcab9c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bcab9c)
 #2 0x0000000003b18248 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000072f27a642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000072f27a6969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000072f27a642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000072f27a6287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x000072f27a62871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x000072f27a639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000066bb12f clang::Parser::ConsumeAndStoreInitializer(llvm::SmallVector<clang::Token, 4u>&, clang::Parser::CachedInitKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bb12f)
#10 0x00000000066e7c3a clang::Parser::ParseParameterDeclarationClause(clang::DeclaratorContext, clang::ParsedAttributes&, llvm::SmallVectorImpl<clang::DeclaratorChunk::ParamInfo>&, clang::SourceLocation&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e7c3a)
#11 0x00000000066e8598 clang::Parser::ParseFunctionDeclarator(clang::Declarator&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e8598)
#12 0x00000000066ed6af clang::Parser::ParseDirectDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ed6af)
#13 0x00000000066da6e6 clang::Parser::ParseDeclaratorInternal(clang::Declarator&, void (clang::Parser::*)(clang::Declarator&)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66da6e6)
#14 0x000000000816c711 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x816c711)
#15 0x00000000066c9d0f clang::Parser::ParseDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66c9d0f)
#16 0x00000000066fe8a5 clang::Parser::ParseCXXMemberDeclaratorBeforeInitializer(clang::Declarator&, clang::VirtSpecifiers&, clang::ActionResult<clang::Expr*, true>&, clang::Parser::LateParsedAttrList&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66fe8a5)
#17 0x0000000006705920 clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6705920)
#18 0x0000000006707611 clang::Parser::ParseCXXClassMemberDeclarationWithPragmas(clang::AccessSpecifier&, clang::ParsedAttributes&, clang::TypeSpecifierType, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6707611)
#19 0x0000000006709157 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6709157)
#20 0x000000000670b903 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x670b903)
#21 0x00000000066e0100 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e0100)
#22 0x000000000669dc34 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669dc34)
#23 0x000000000669e69e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669e69e)
#24 0x00000000066a5e33 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a5e33)
#25 0x00000000066a6d1d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a6d1d)
#26 0x00000000066a71c0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a71c0)
#27 0x0000000006699202 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6699202)
#28 0x0000000004542c48 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4542c48)
#29 0x00000000047fe239 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47fe239)
#30 0x000000000477cbde clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x477cbde)
#31 0x00000000048e3a0e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e3a0e)
#32 0x0000000000ce1c8f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce1c8f)
#33 0x0000000000cd998a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#34 0x0000000004586969 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#35 0x0000000003b186f4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b186f4)
#36 0x0000000004586f5f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#37 0x000000000454c85d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x454c85d)
#38 0x000000000454d94d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x454d94d)
#39 0x0000000004555275 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4555275)
#40 0x0000000000cdeb4f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdeb4f)
#41 0x0000000000badae4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbadae4)
#42 0x000072f27a629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#43 0x000072f27a629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#44 0x0000000000cd943e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd943e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
ASM generation compiler returned: 134
@yijan4845 yijan4845 added clang:frontend Language frontend issues, e.g. anything involving "Sema" crash-on-invalid generated by fuzzer labels Oct 25, 2024
@llvmbot
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llvmbot commented Oct 25, 2024

@llvm/issue-subscribers-clang-frontend

Author: Yihan Yang (yijan4845)

**This testcase is generated by a fuzzer.**

Compiler Explorer: https://godbolt.org/z/9EEEefGbT

This invalid code will crash on Clang Assertion Trunk:

struct S {
  void m(int x = 0,
#pragma message "Any message") {
    int z = 0;
    #pragma unused(x)
  }
};

It seems that this goes back to clang-5.

Stack dump:

clang++: /root/llvm-project/clang/include/clang/Parse/Parser.h:549: clang::SourceLocation clang::Parser::ConsumeToken(): Assertion `!isTokenSpecial() &amp;&amp; "Should consume special tokens with Consume*Token"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics &lt;source&gt;
1.	&lt;source&gt;:5:13: at annotation token
2.	&lt;source&gt;:1:1: parsing struct/union/class body 'S'
 #<!-- -->0 0x0000000003bcced8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bcced8)
 #<!-- -->1 0x0000000003bcab9c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bcab9c)
 #<!-- -->2 0x0000000003b18248 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x000072f27a642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x000072f27a6969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x000072f27a642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x000072f27a6287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x000072f27a62871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x000072f27a639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x00000000066bb12f clang::Parser::ConsumeAndStoreInitializer(llvm::SmallVector&lt;clang::Token, 4u&gt;&amp;, clang::Parser::CachedInitKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bb12f)
#<!-- -->10 0x00000000066e7c3a clang::Parser::ParseParameterDeclarationClause(clang::DeclaratorContext, clang::ParsedAttributes&amp;, llvm::SmallVectorImpl&lt;clang::DeclaratorChunk::ParamInfo&gt;&amp;, clang::SourceLocation&amp;, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e7c3a)
#<!-- -->11 0x00000000066e8598 clang::Parser::ParseFunctionDeclarator(clang::Declarator&amp;, clang::ParsedAttributes&amp;, clang::BalancedDelimiterTracker&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e8598)
#<!-- -->12 0x00000000066ed6af clang::Parser::ParseDirectDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ed6af)
#<!-- -->13 0x00000000066da6e6 clang::Parser::ParseDeclaratorInternal(clang::Declarator&amp;, void (clang::Parser::*)(clang::Declarator&amp;)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66da6e6)
#<!-- -->14 0x000000000816c711 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x816c711)
#<!-- -->15 0x00000000066c9d0f clang::Parser::ParseDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66c9d0f)
#<!-- -->16 0x00000000066fe8a5 clang::Parser::ParseCXXMemberDeclaratorBeforeInitializer(clang::Declarator&amp;, clang::VirtSpecifiers&amp;, clang::ActionResult&lt;clang::Expr*, true&gt;&amp;, clang::Parser::LateParsedAttrList&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66fe8a5)
#<!-- -->17 0x0000000006705920 clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::ParsingDeclRAIIObject*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6705920)
#<!-- -->18 0x0000000006707611 clang::Parser::ParseCXXClassMemberDeclarationWithPragmas(clang::AccessSpecifier&amp;, clang::ParsedAttributes&amp;, clang::TypeSpecifierType, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6707611)
#<!-- -->19 0x0000000006709157 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&amp;, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6709157)
#<!-- -->20 0x000000000670b903 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x670b903)
#<!-- -->21 0x00000000066e0100 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e0100)
#<!-- -->22 0x000000000669dc34 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669dc34)
#<!-- -->23 0x000000000669e69e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669e69e)
#<!-- -->24 0x00000000066a5e33 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a5e33)
#<!-- -->25 0x00000000066a6d1d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a6d1d)
#<!-- -->26 0x00000000066a71c0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a71c0)
#<!-- -->27 0x0000000006699202 clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6699202)
#<!-- -->28 0x0000000004542c48 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4542c48)
#<!-- -->29 0x00000000047fe239 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47fe239)
#<!-- -->30 0x000000000477cbde clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x477cbde)
#<!-- -->31 0x00000000048e3a0e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e3a0e)
#<!-- -->32 0x0000000000ce1c8f cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce1c8f)
#<!-- -->33 0x0000000000cd998a ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->34 0x0000000004586969 void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const::'lambda'()&gt;(long) Job.cpp:0:0
#<!-- -->35 0x0000000003b186f4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b186f4)
#<!-- -->36 0x0000000004586f5f clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const (.part.0) Job.cpp:0:0
#<!-- -->37 0x000000000454c85d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x454c85d)
#<!-- -->38 0x000000000454d94d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x454d94d)
#<!-- -->39 0x0000000004555275 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4555275)
#<!-- -->40 0x0000000000cdeb4f clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdeb4f)
#<!-- -->41 0x0000000000badae4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbadae4)
#<!-- -->42 0x000072f27a629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->43 0x000072f27a629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->44 0x0000000000cd943e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd943e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
ASM generation compiler returned: 134

@shafik shafik added the confirmed Verified by a second party label Oct 26, 2024
@k-arrows k-arrows mentioned this issue May 10, 2025
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@AaronBallman
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A simpler reproducer is:

struct S {
  void m(int x = 0;
    #pragma unused(x)
  }
};

The issue is that the pragma is appearing within a malformed parameter list for a member function.

AaronBallman added a commit to AaronBallman/llvm-project that referenced this issue May 12, 2025
@AaronBallman
Fix crash with invalid member function param list
8e43846 
We cannot consume annotation tokens with ConsumeToken(), so any pragmas
present in an invalid initializer would previously crash. Now we handle
annotation tokens more generally and avoid the crash.

Fixes llvm#113722
@AaronBallman AaronBallman mentioned this issue May 12, 2025
Merged
AaronBallman added a commit that referenced this issue May 13, 2025
@AaronBallman
Fix crash with invalid member function param list (#139595)
7866c40 
We cannot consume annotation tokens with ConsumeToken(), so any pragmas
present in an invalid initializer would previously crash. Now we handle
annotation tokens more generally and avoid the crash.

Fixes #113722
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Fix crash with invalid member function param list AaronBallman/llvm-project
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@AaronBallman @shafik @yijan4845 @llvmbot