| Issue |
173767
|
| Summary |
clang assertion 'is<TypeInfoLValue>() && "not a type_info lvalue"' failed in getBaseAlignment when using __builtin_assume_aligned on a new _expression_ result.
|
| Labels |
clang:frontend,
crash-on-valid
|
| Assignees |
|
| Reporter |
AbyssStaror
|
### Link for quick verification: https://godbolt.org/z/9daanhP9z
```c
#include <vector>
typedef unsigned char v64u8 __attribute__((__vector_size__(64)));
int main() {
std::vector<v64u8> vec2(10);
vec2[0] = *(v64u8 *)__builtin_assume_aligned(new unsigned char[64], 64);
}
```
Go back to `clang 10.0.0 (assertions)`.
The function `getBaseAlignment` expects a stable pointer base. While the input is a temporary result of a new operator being cast and dereferenced, the evaluator enters an unexpected state where it expects a `type_info` object but finds something else, triggering the assert.
## Stack dump
```console
clang++: /root/llvm-project/llvm/tools/clang/lib/AST/APValue.cpp:118: clang::QualType clang::APValue::LValueBase::getTypeInfoType() const: Assertion `is<TypeInfoLValue>() && "not a type_info lvalue"' 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++ -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>:12:1: current parser token '}'
2. <source>:6:12: parsing function body 'main'
3. <source>:6:12: in compound statement ('{}')
#0 0x00000000042ef648 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42ef648)
#1 0x00000000042eca74 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42eca74)
#2 0x0000000004231818 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000076cc34242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000076cc342969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000076cc34242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000076cc342287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000076cc3422871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x000076cc34239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x000000000792c571 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x792c571)
#10 0x0000000007cea099 getBaseAlignment((anonymous namespace)::EvalInfo&, (anonymous namespace)::LValue const&) (.isra.0) ExprConstant.cpp:0:0
#11 0x0000000007d8241b (anonymous namespace)::PointerExprEvaluator::VisitBuiltinCallExpr(clang::CallExpr const*, unsigned int) ExprConstant.cpp:0:0
#12 0x0000000007d83121 (anonymous namespace)::PointerExprEvaluator::VisitCallExpr(clang::CallExpr const*) ExprConstant.cpp:0:0
#13 0x0000000007d3bf73 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::PointerExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#14 0x0000000007d7ffb8 (anonymous namespace)::PointerExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
#15 0x0000000007d3bf99 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::PointerExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#16 0x0000000007d3e02b EvaluatePointer(clang::Expr const*, (anonymous namespace)::LValue&, (anonymous namespace)::EvalInfo&, bool) ExprConstant.cpp:0:0
#17 0x0000000007d44f6e clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::LValueExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#18 0x0000000007d45c6d EvaluateLValue(clang::Expr const*, (anonymous namespace)::LValue&, (anonymous namespace)::EvalInfo&, bool) ExprConstant.cpp:0:0
#19 0x0000000007d5955b (anonymous namespace)::VectorExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
#20 0x0000000007d59a79 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::VectorExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#21 0x0000000007d5afbd EvaluateVector(clang::Expr const*, clang::APValue&, (anonymous namespace)::EvalInfo&) ExprConstant.cpp:0:0
#22 0x0000000007d0f676 Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#23 0x0000000007d44bf7 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::LValueExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#24 0x0000000007d45c6d EvaluateLValue(clang::Expr const*, (anonymous namespace)::LValue&, (anonymous namespace)::EvalInfo&, bool) ExprConstant.cpp:0:0
#25 0x0000000007d0f546 Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#26 0x0000000007d1017b EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#27 0x0000000007d147fe clang::Expr::EvaluateForOverflow(clang::ASTContext const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7d147fe)
#28 0x0000000006c5d396 clang::Sema::CheckForIntOverflow(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c5d396)
#29 0x0000000006ca37cc clang::Sema::CheckCompletedExpr(clang::Expr*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ca37cc)
#30 0x000000000704be07 clang::Sema::ActOnFinishFullExpr(clang::Expr*, clang::SourceLocation, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x704be07)
#31 0x000000000736d4ce clang::Sema::ActOnExprStmt(clang::ActionResult<clang::Expr*, true>, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x736d4ce)
#32 0x0000000006b27c94 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b27c94)
#33 0x0000000006b1f0a4 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b1f0a4)
#34 0x0000000006b1fa86 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b1fa86)
#35 0x0000000006b283ce clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b283ce)
#36 0x0000000006b28c1a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b28c1a)
#37 0x0000000006a2eb7b clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a2eb7b)
#38 0x0000000006a6503d 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+++0x6a6503d)
#39 0x0000000006a21cdb clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a21cdb)
#40 0x0000000006a224cf clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a224cf)
#41 0x0000000006a2a2fa clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a2a2fa)
#42 0x0000000006a2b295 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a2b295)
#43 0x0000000006a0c31a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a0c31a)
#44 0x0000000004c50978 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c50978)
#45 0x0000000004f46ff5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f46ff5)
#46 0x0000000004ec728e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ec728e)
#47 0x000000000504137d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x504137d)
#48 0x0000000000de5c4c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde5c4c)
#49 0x0000000000ddc69a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#50 0x0000000000ddc81d int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#51 0x0000000004cc3049 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
#52 0x0000000004231cb4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4231cb4)
#53 0x0000000004cc365f 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
#54 0x0000000004c84142 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c84142)
#55 0x0000000004c850ee 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+++0x4c850ee)
#56 0x0000000004c8c545 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c8c545)
#57 0x0000000000de2041 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde2041)
#58 0x0000000000c8d094 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc8d094)
#59 0x000076cc34229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#60 0x000076cc34229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#61 0x0000000000ddc135 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xddc135)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
![]()
_______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
