kadircet wrote:
so after this patch, clang seems to be crashing on:
```cpp
template <typename T, typename Y> struct map {};
template <typename T> class foo {};
template <template <typename...> class MapType, typename Value>
Value bar(MapType<int, Value> map);
template <template <typename...> class MapType, typename Value>
Value bar(MapType<int, foo<Value>> map);
void aux() {
map<int, foo<int>> input;
bar(input);
}
```
stack trace:
```
$ ./bin/clang -fsyntax-only -xc++ -std=c++20 -Wno-everything foo.cc
clang:
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:596:
TemplateDeductionResult DeduceTemplateArguments(Sema &, TemplateParameterList
*, TemplateName, TemplateName, TemplateDeductionInfo &,
ArrayRef<TemplateArgument>, SmallVectorImpl<DeducedTemplateArgument> &):
Assertion `DefaultArguments.size() <= As->size()' 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: ./bin/clang -fsyntax-only -xc++ -std=c++20
-Wno-everything myreduce.cc
1. myreduce.cc:12:12: current parser token ')'
2. myreduce.cc:10:12: parsing function body 'aux'
3. myreduce.cc:10:12: in compound statement ('{}')
#0 0x0000561942c22558 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
/usr/local/google/home/kadircet/repos/llvm/llvm/lib/Support/Unix/Signals.inc:723:13
#1 0x0000561942c2011e llvm::sys::RunSignalHandlers()
/usr/local/google/home/kadircet/repos/llvm/llvm/lib/Support/Signals.cpp:106:18
#2 0x0000561942b8c686 HandleCrash
/usr/local/google/home/kadircet/repos/llvm/llvm/lib/Support/CrashRecoveryContext.cpp:73:5
#3 0x0000561942b8c686 CrashRecoverySignalHandler(int)
/usr/local/google/home/kadircet/repos/llvm/llvm/lib/Support/CrashRecoveryContext.cpp:390:51
#4 0x00007fa5f6e5a510 (/lib/x86_64-linux-gnu/libc.so.6+0x3c510)
#5 0x00007fa5f6ea816c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#6 0x00007fa5f6e5a472 raise ./signal/../sysdeps/posix/raise.c:27:6
#7 0x00007fa5f6e444b2 abort ./stdlib/abort.c:81:7
#8 0x00007fa5f6e443d5 _nl_load_domain ./intl/loadmsgcat.c:1177:9
#9 0x00007fa5f6e533a2 (/lib/x86_64-linux-gnu/libc.so.6+0x353a2)
#10 0x0000561945cbacbc set_size
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/ADT/SmallVector.h:102:5
#11 0x0000561945cbacbc resizeImpl<false>
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/ADT/SmallVector.h:647:11
#12 0x0000561945cbacbc resize
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/ADT/SmallVector.h:651:30
#13 0x0000561945cbacbc SmallVector
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/ADT/SmallVector.h:1220:11
#14 0x0000561945cbacbc DeduceTemplateArguments(clang::Sema&,
clang::TemplateParameterList*, clang::TemplateName, clang::TemplateName,
clang::sema::TemplateDeductionInfo&, llvm::ArrayRef<clang::TemplateArgument>,
llvm::SmallVectorImpl<clang::DeducedTemplateArgument>&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:597:37
#15 0x0000561945cbde14 DeduceTemplateSpecArguments(clang::Sema&,
clang::TemplateParameterList*, clang::QualType, clang::QualType,
clang::sema::TemplateDeductionInfo&,
llvm::SmallVectorImpl<clang::DeducedTemplateArgument>&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:717:13
#16 0x0000561945caf095 DeduceTemplateArgumentsByTypeMatch(clang::Sema&,
clang::TemplateParameterList*, clang::QualType, clang::QualType,
clang::sema::TemplateDeductionInfo&,
llvm::SmallVectorImpl<clang::DeducedTemplateArgument>&, unsigned int, bool,
bool)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:0:16
#17 0x0000561945cbd8e2 DeduceTemplateArguments(clang::Sema&,
clang::TemplateParameterList*, clang::QualType const*, unsigned int,
clang::QualType const*, unsigned int, clang::sema::TemplateDeductionInfo&,
llvm::SmallVectorImpl<clang::DeducedTemplateArgument>&, unsigned int, bool)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:1223:44
#18 0x0000561945cb5910 isAtLeastAsSpecializedAs(clang::Sema&,
clang::SourceLocation, clang::FunctionTemplateDecl const*,
clang::FunctionTemplateDecl const*, clang::TemplatePartialOrderingContext,
bool, llvm::SmallVector<clang::QualType, 6u> const&,
llvm::SmallVector<clang::QualType, 6u> const&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:0:0
#19 0x0000561945cb45df
clang::Sema::getMoreSpecializedTemplate(clang::FunctionTemplateDecl*,
clang::FunctionTemplateDecl*, clang::SourceLocation,
clang::TemplatePartialOrderingContext, unsigned int, clang::QualType,
clang::QualType, bool)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:0:18
#20 0x0000561945aef302 clang::isBetterOverloadCandidate(clang::Sema&,
clang::OverloadCandidate const&, clang::OverloadCandidate const&,
clang::SourceLocation, clang::OverloadCandidateSet::CandidateSetKind)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaOverload.cpp:0:50
#21 0x0000561945ae0836
clang::OverloadCandidateSet::BestViableFunction(clang::Sema&,
clang::SourceLocation, clang::OverloadCandidate*&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaOverload.cpp:10883:11
#22 0x0000561945af97a9 clang::Sema::BuildOverloadedCallExpr(clang::Scope*,
clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation,
llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool,
bool)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaOverload.cpp:14194:20
#23 0x00005619456f14c3 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*, bool, bool)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaExpr.cpp:6555:16
#24 0x000056194570811a clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Sema/SemaExpr.cpp:6446:7
#25 0x00005619451c0358
clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*,
true>)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseExpr.cpp:2206:23
#26 0x00005619451c4bbd
clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&,
clang::Parser::TypeCastState, bool, bool*)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseExpr.cpp:1908:9
#27 0x00005619451bd35c ParseCastExpression
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseExpr.cpp:0:20
#28 0x00005619451bd35c
clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseExpr.cpp:182:20
#29 0x00005619451bd259
clang::Parser::ParseExpression(clang::Parser::TypeCastState)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseExpr.cpp:134:10
#30 0x0000561945253ce1 isInvalid
/usr/local/google/home/kadircet/repos/llvm/clang/include/clang/Sema/Ownership.h:199:41
#31 0x0000561945253ce1
clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseStmt.cpp:552:12
#32 0x0000561945251acc
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*,
clang::ParsedAttributes&, clang::ParsedAttributes&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseStmt.cpp:0:14
#33 0x00005619452513b2
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseStmt.cpp:121:20
#34 0x000056194525b8b1 clang::Parser::ParseCompoundStatementBody(bool)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseStmt.cpp:1248:11
#35 0x000056194525c952 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseStmt.cpp:2526:21
#36 0x000056194519c469
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/Parser.cpp:0:0
#37 0x0000561945211c9d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::ParsedAttributes&,
clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*,
clang::Parser::ForRangeInit*)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseDecl.cpp:2394:18
#38 0x000056194519b089
clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/Parser.cpp:0:10
#39 0x000056194519a8e2
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/Parser.cpp:1271:12
#40 0x0000561945199709
clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec*)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/Parser.cpp:0:14
#41 0x0000561945197736
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&,
clang::Sema::ModuleImportState&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/Parser.cpp:763:10
#42 0x0000561945192d5e clang::ParseAST(clang::Sema&, bool, bool)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Parse/ParseAST.cpp:162:5
#43 0x000056194389a37f clang::FrontendAction::Execute()
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Frontend/FrontendAction.cpp:1082:10
#44 0x000056194380728d getPtr
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/Support/Error.h:276:42
#45 0x000056194380728d operator bool
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/Support/Error.h:239:16
#46 0x000056194380728d
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Frontend/CompilerInstance.cpp:1061:23
#47 0x000056194398013e
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:280:25
#48 0x00005619404c7baf cc1_main(llvm::ArrayRef<char const*>, char const*,
void*)
/usr/local/google/home/kadircet/repos/llvm/clang/tools/driver/cc1_main.cpp:232:15
#49 0x00005619404c448d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&,
llvm::ToolContext const&)
/usr/local/google/home/kadircet/repos/llvm/clang/tools/driver/driver.cpp:215:12
#50 0x0000561943645c99 operator()
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Driver/Job.cpp:440:30
#51 0x0000561943645c99 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::$_0>(long)
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/ADT/STLFunctionalExtras.h:45:12
#52 0x0000561942b8c3c6 operator()
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/ADT/STLFunctionalExtras.h:0:12
#53 0x0000561942b8c3c6
llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
/usr/local/google/home/kadircet/repos/llvm/llvm/lib/Support/CrashRecoveryContext.cpp:426:3
#54 0x0000561943645392
clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char>>*, bool*) const
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Driver/Job.cpp:440:7
#55 0x00005619435fd4c7
clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
clang::driver::Command const*&, bool) const
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Driver/Compilation.cpp:199:15
#56 0x00005619435fda07
clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool)
const
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Driver/Compilation.cpp:253:13
#57 0x000056194361e719 empty
/usr/local/google/home/kadircet/repos/llvm/llvm/include/llvm/ADT/SmallVector.h:94:46
#58 0x000056194361e719
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&)
/usr/local/google/home/kadircet/repos/llvm/clang/lib/Driver/Driver.cpp:1942:23
#59 0x00005619404c398d clang_main(int, char**, llvm::ToolContext const&)
/usr/local/google/home/kadircet/repos/llvm/clang/tools/driver/driver.cpp:391:21
#60 0x00005619404d44f7 main
/usr/local/google/home/kadircet/repos/llvm/build/tools/clang/tools/driver/clang-driver.cpp:17:10
#61 0x00007fa5f6e456ca __libc_start_call_main
./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#62 0x00007fa5f6e45785 call_init ./csu/../csu/libc-start.c:128:20
#63 0x00007fa5f6e45785 __libc_start_main ./csu/../csu/libc-start.c:347:5
#64 0x00005619404c1de1 _start (./bin/clang+0x546ede1)
```
@yozhu this is the same assertion you mentioned in
https://github.com/llvm/llvm-project/pull/94659, but doesn't really involve
default template args, so I am not sure if this is the same kind of reproducer.
https://github.com/llvm/llvm-project/pull/93433
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