[clang++][crash on valid] no address_space attribute found at the expected location!

[yijan4845]

This testcase is generated by a fuzzer.

Compiler Explorer: https://godbolt.org/z/j51Wj7c6a

This valid code will crash on both Clang Trunk and Clang Assertion Trunk:

template <int I>
void func() {
  int *y __attribute__((address_space(I)));
}

Stack dump:

no address_space attribute found at the expected location!
UNREACHABLE executed at /root/llvm-project/clang/lib/Sema/SemaType.cpp:6273!
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>:3:43: current parser token ';'
2.	<source>:2:13: parsing function body 'func'
3.	<source>:2:13: in compound statement ('{}')
 #0 0x0000000003b99db8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b99db8)
 #1 0x0000000003b97a7c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b97a7c)
 #2 0x0000000003ae6288 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000071cafea42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000071cafea969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000071cafea42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000071cafea287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x0000000003af1b5a (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3af1b5a)
 #8 0x000000000749bdb7 GetFullTypeForDeclarator((anonymous namespace)::TypeProcessingState&, clang::QualType, clang::TypeSourceInfo*) SemaType.cpp:0:0
 #9 0x000000000749c4cf clang::Sema::GetTypeForDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x749c4cf)
#10 0x00000000069ed9ab clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69ed9ab)
#11 0x00000000069eec30 clang::Sema::ActOnDeclarator(clang::Scope*, clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69eec30)
#12 0x00000000066515de clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66515de)
#13 0x0000000006661059 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6661059)
#14 0x0000000006669977 clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6669977)
#15 0x0000000006669e39 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6669e39)
#16 0x00000000067161d2 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67161d2)
#17 0x0000000006716f00 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6716f00)
#18 0x0000000006717dd5 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6717dd5)
#19 0x000000000671952a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x671952a)
#20 0x000000000662c633 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662c633)
#21 0x0000000006661a3d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6661a3d)
#22 0x000000000672aec6 clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672aec6)
#23 0x00000000067387fc clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#24 0x0000000006738b1a clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6738b1a)
#25 0x0000000006669fe3 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6669fe3)
#26 0x0000000006628317 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6628317)
#27 0x00000000066291bd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66291bd)
#28 0x0000000006629660 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6629660)
#29 0x000000000661b6a2 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x661b6a2)
#30 0x00000000044f0a28 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44f0a28)
#31 0x00000000047aa379 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47aa379)
#32 0x0000000004728cbe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4728cbe)
#33 0x000000000488fbfe clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x488fbfe)
#34 0x0000000000cd801f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd801f)
#35 0x0000000000ccfd2a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#36 0x00000000045346f9 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
#37 0x0000000003ae6734 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ae6734)
#38 0x0000000004534cef 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
#39 0x00000000044fa62d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44fa62d)
#40 0x00000000044fb71d 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+++0x44fb71d)
#41 0x0000000004503045 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4503045)
#42 0x0000000000cd4eef clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd4eef)
#43 0x0000000000ba49a4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xba49a4)
#44 0x000071cafea29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#45 0x000071cafea29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#46 0x0000000000ccf7de _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xccf7de)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Yihan Yang (yijan4845)

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

Compiler Explorer: https://godbolt.org/z/j51Wj7c6a

This valid code will crash on both Clang Trunk and Clang Assertion Trunk:

template <int I>
void func() {
  int *y __attribute__((address_space(I)));
}

Stack dump:

no address_space attribute found at the expected location!
UNREACHABLE executed at /root/llvm-project/clang/lib/Sema/SemaType.cpp:6273!
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>:3:43: current parser token ';'
2.	<source>:2:13: parsing function body 'func'
3.	<source>:2:13: in compound statement ('{}')
 #<!-- -->0 0x0000000003b99db8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b99db8)
 #<!-- -->1 0x0000000003b97a7c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b97a7c)
 #<!-- -->2 0x0000000003ae6288 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x000071cafea42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x000071cafea969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x000071cafea42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x000071cafea287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x0000000003af1b5a (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3af1b5a)
 #<!-- -->8 0x000000000749bdb7 GetFullTypeForDeclarator((anonymous namespace)::TypeProcessingState&amp;, clang::QualType, clang::TypeSourceInfo*) SemaType.cpp:0:0
 #<!-- -->9 0x000000000749c4cf clang::Sema::GetTypeForDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x749c4cf)
#<!-- -->10 0x00000000069ed9ab clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&amp;, llvm::MutableArrayRef&lt;clang::TemplateParameterList*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69ed9ab)
#<!-- -->11 0x00000000069eec30 clang::Sema::ActOnDeclarator(clang::Scope*, clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69eec30)
#<!-- -->12 0x00000000066515de clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66515de)
#<!-- -->13 0x0000000006661059 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6661059)
#<!-- -->14 0x0000000006669977 clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6669977)
#<!-- -->15 0x0000000006669e39 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6669e39)
#<!-- -->16 0x00000000067161d2 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67161d2)
#<!-- -->17 0x0000000006716f00 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6716f00)
#<!-- -->18 0x0000000006717dd5 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6717dd5)
#<!-- -->19 0x000000000671952a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x671952a)
#<!-- -->20 0x000000000662c633 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662c633)
#<!-- -->21 0x0000000006661a3d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6661a3d)
#<!-- -->22 0x000000000672aec6 clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&amp;, clang::ParsingDeclRAIIObject&amp;, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672aec6)
#<!-- -->23 0x00000000067387fc clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#<!-- -->24 0x0000000006738b1a clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6738b1a)
#<!-- -->25 0x0000000006669fe3 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6669fe3)
#<!-- -->26 0x0000000006628317 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6628317)
#<!-- -->27 0x00000000066291bd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66291bd)
#<!-- -->28 0x0000000006629660 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6629660)
#<!-- -->29 0x000000000661b6a2 clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x661b6a2)
#<!-- -->30 0x00000000044f0a28 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44f0a28)
#<!-- -->31 0x00000000047aa379 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47aa379)
#<!-- -->32 0x0000000004728cbe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4728cbe)
#<!-- -->33 0x000000000488fbfe clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x488fbfe)
#<!-- -->34 0x0000000000cd801f cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd801f)
#<!-- -->35 0x0000000000ccfd2a ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->36 0x00000000045346f9 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
#<!-- -->37 0x0000000003ae6734 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ae6734)
#<!-- -->38 0x0000000004534cef 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
#<!-- -->39 0x00000000044fa62d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44fa62d)
#<!-- -->40 0x00000000044fb71d 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+++0x44fb71d)
#<!-- -->41 0x0000000004503045 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+++0x4503045)
#<!-- -->42 0x0000000000cd4eef clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd4eef)
#<!-- -->43 0x0000000000ba49a4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xba49a4)
#<!-- -->44 0x000071cafea29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->45 0x000071cafea29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->46 0x0000000000ccf7de _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xccf7de)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

[Ayush9054]

Title:
Segmentation Fault in Clang with __attribute__((address_space(I))) in Template Function

---

Description:
When compiling a template function that uses the __attribute__((address_space(I))) attribute, Clang crashes with a segmentation fault. The crash happens during semantic analysis in SemaType.cpp, where the compiler fails to find the expected location for the address_space attribute.

---

Steps to Reproduce:

1. Use the following code:

   template <int I>
   void func() {
     int y __attribute__((address_space(I)));
   }

2. Compile it using the command:

   clang++ -gdwarf-4 -g -o output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S source.cpp

3. The compiler crashes with the following error:

---

Expected Behavior:
The code should either compile successfully or produce an appropriate diagnostic message.

---

Actual Behavior:
The compiler crashes, producing the following error:

no address_space attribute found at the expected location!
UNREACHABLE executed at /root/llvm-project/clang/lib/Sema/SemaType.cpp:6273!
...
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)

---

Environment:

• Clang version: Assertions build of Clang trunk
• Target: x86_64-unknown-linux-gnu
• OS: (, e.g., Ubuntu 22.04)

---

Crash Logs & Files:
Please find attached the crash backtrace and any related diagnostic files.

---

Additional Information:
The issue seems related to the use of the address_space attribute within a template function. The error message suggests that Clang is unable to find the attribute in the expected location, leading to a crash during semantic analysis.

---

[shafik]

Goes back to clang-6: https://godbolt.org/z/xWdPe7sjz

[Ayush9054]

It seems the issue you're experiencing goes back to Clang 6, as demonstrated on Compiler Explorer (Godbolt): https://godbolt.org/z/xWdPe7sjz. You may want to include this information in the bug report to indicate that the bug has been present for several versions of Clang.

Here's an updated version of your bug report, including this additional information:

---

Title:
Segmentation Fault in Clang with __attribute__((address_space(I))) in Template Function (Present Since Clang 6)

---

Description:
When compiling a template function that uses the __attribute__((address_space(I))) attribute, Clang crashes with a segmentation fault. The crash happens during semantic analysis in SemaType.cpp, where the compiler fails to find the expected location for the address_space attribute.

This issue has been present since Clang 6, as demonstrated in this Godbolt link, and continues to occur in the latest Clang trunk.

---

Steps to Reproduce:

1. Use the following code:

   template <int I>
   void func() {
     int y __attribute__((address_space(I)));
   }

2. Compile it using the command:

   clang++ -gdwarf-4 -g -o output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S source.cpp

3. The compiler crashes with the following error:

---

Expected Behavior:
The code should either compile successfully or produce an appropriate diagnostic message.

---

Actual Behavior:
The compiler crashes, producing the following error:

no address_space attribute found at the expected location!
UNREACHABLE executed at /root/llvm-project/clang/lib/Sema/SemaType.cpp:6273!
...
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)

---

Environment:

• Clang version: Assertions build of Clang trunk
• Issue confirmed as far back as Clang 6: Godbolt link
• Target: x86_64-unknown-linux-gnu
• OS: (specify your OS, e.g., Ubuntu 22.04)

---

Crash Logs & Files:
Please find attached the crash backtrace and any related diagnostic files.

---

Additional Information:
The issue seems related to the use of the address_space attribute within a template function. The error message suggests that Clang is unable to find the attribute in the expected location, leading to a crash during semantic analysis.

The bug has been confirmed as far back as Clang 6, as per this Compiler Explorer example.

---

This should now include all the relevant information to help the LLVM team track down the issue.

[zyn0217]

@Ayush9054 Please don't post LLM-generated texts about the issue, thanks!

[Ayush9054]

@zyn0217 my bad brother, just trying something new