| Issue |
96485
|
| Summary |
Friend-injecting a template function causes an ICE if you inject after trying to instantiate that function
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
HolyBlackCat
|
The following causes an internal compiler error in Clang 18 and trunk: https://gcc.godbolt.org/z/r9vvWGnnY
GCC also segfaults here, while MSVC compiles and runs this successfully, calling `bar<10,20>()`.
```cpp
template <int X, int Y> void bar() {}
template <typename T>
struct Reader
{
template <int X>
friend void foo(Reader<T>);
};
template <typename T, int Y>
struct Writer
{
template <int X>
friend void foo(Reader<T>) {bar<X, Y>();}
};
int main()
{
foo<10>(Reader<int>{});
Writer<int, 20>{};
}
```
Clang says:
```
<source>:14:33: error: cannot compile this l-value _expression_ yet
14 | friend void foo(Reader<T>) {bar<X, Y>();}
| ^~~~~~~~~
```
And then spits out the stacktrace.
But if you e.g. try to `cout` `X` and `Y`, it doesn't print this error and immediately proceeds to the stacktrace.
<details>
<summary>Stack</summary>
```
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-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1. <eof> parser at end of file
2. Per-file LLVM IR generation
3. <source>:14:17: Generating code for declaration 'foo'
#0 0x00000000037a10a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x37a10a8)
#1 0x000000000379f1f4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x379f1f4)
#2 0x00000000036e77c8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000079f5cc442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000000003e3b6e7 arrangeFreeFunctionLikeCall(clang::CodeGen::CodeGenTypes&, clang::CodeGen::CodeGenModule&, clang::CodeGen::CallArgList const&, clang::FunctionType const*, unsigned int, bool) CGCall.cpp:0:0
#5 0x0000000003ed9879 clang::CodeGen::CodeGenFunction::EmitCall(clang::QualType, clang::CodeGen::CGCallee const&, clang::CallExpr const*, clang::CodeGen::ReturnValueSlot, llvm::Value*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3ed9879)
#6 0x0000000003edb237 clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3edb237)
#7 0x0000000003f24c7a (anonymous namespace)::ScalarExprEmitter::VisitCallExpr(clang::CallExpr const*) CGExprScalar.cpp:0:0
#8 0x0000000003f1b6a1 clang::StmtVisitorBase<std::add_pointer, (anonymous namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) CGExprScalar.cpp:0:0
#9 0x0000000003f20a92 clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f20a92)
#10 0x0000000003ebce8e clang::CodeGen::CodeGenFunction::EmitAnyExpr(clang::Expr const*, clang::CodeGen::AggValueSlot, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3ebce8e)
#11 0x0000000003ed750d clang::CodeGen::CodeGenFunction::EmitIgnoredExpr(clang::Expr const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3ed750d)
#12 0x0000000003acf3be clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3acf3be)
#13 0x0000000003ad5db9 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3ad5db9)
#14 0x0000000003b36a96 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3b36a96)
#15 0x0000000003b439f8 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3b439f8)
#16 0x0000000003b9b73b clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3b9b73b)
#17 0x0000000003b971c5 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3b971c5)
#18 0x0000000003ba1e51 clang::CodeGen::CodeGenModule::EmitDeferred() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3ba1e51)
#19 0x0000000003ba42a3 clang::CodeGen::CodeGenModule::Release() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3ba42a3)
#20 0x000000000403fa7e (anonymous namespace)::CodeGeneratorImpl::HandleTranslationUnit(clang::ASTContext&) ModuleBuilder.cpp:0:0
#21 0x000000000403dac5 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x403dac5)
#22 0x0000000005f5e2ac clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5f5e2ac)
#23 0x000000000403e245 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x403e245)
#24 0x00000000042ddde1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x42ddde1)
#25 0x00000000042616db clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x42616db)
#26 0x00000000043c4b13 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x43c4b13)
#27 0x0000000000c7467c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc7467c)
#28 0x0000000000c6e77d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#29 0x0000000004087889 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
#30 0x00000000036e7bf3 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36e7bf3)
#31 0x0000000004087aa9 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
#32 0x000000000404d287 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x404d287)
#33 0x000000000404dc3d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x404dc3d)
#34 0x0000000004057d9c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4057d9c)
#35 0x0000000000c71b21 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc71b21)
#36 0x0000000000b4d804 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xb4d804)
#37 0x000079f5cc429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#38 0x000079f5cc429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#39 0x0000000000c6e21e _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc6e21e)
```
</details>
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