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[Clang][ASTWriter] Assertion `(Value < (1u << BitsWidth)) && "Passing narrower bit width!"' failed. #76443

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widberg opened this issue Dec 27, 2023 · 3 comments
Closed

[Clang][ASTWriter] Assertion `(Value < (1u << BitsWidth)) && "Passing narrower bit width!"' failed. #76443

widberg opened this issue Dec 27, 2023 · 3 comments
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@ChuanqiXu9
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clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash Prefer [crash-on-valid] or [crash-on-invalid]

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@widberg
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widberg commented Dec 27, 2023

When trying to compile a PCH using the following command on trunk (d51e06c)

test.sh

clang++-18 -cc1 -std=c++17 -emit-pch -o qstyle.cpp.oclango qstyle.cpp

qstyle.cpp (reduced from qtbase via cvise)

template <int... Nx> int stringData(const char (&...x)[Nx]) {
  return 0;
}
int qt_meta_stringdata_CLASSQStyleENDCLASS = stringData(
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "");

The command crashes with this backtrace

clang++-18: /data/llvm-project/clang/include/clang/Serialization/ASTWriter.h:901: void clang::BitsPacker::addBits(uint32_t, uint32_t): Assertion `(Value < (1u << BitsWidth)) && "Passing narrower bit width!"' 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: clang++-18 -cc1 -std=c++17 -emit-pch -ferror-limit 0 -o qstyle.cpp.oclango qstyle.cpp
1.	<eof> parser at end of file
2.	qstyle.cpp:1:53: serializing 'x'
 #0 0x000055555add97b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /data/llvm-project/llvm/lib/Support/Unix/Signals.inc:727:0
 #1 0x000055555add72f4 llvm::sys::RunSignalHandlers() /data/llvm-project/llvm/lib/Support/Signals.cpp:105:0
 #2 0x000055555add7f0e SignalHandler(int) /data/llvm-project/llvm/lib/Support/Unix/Signals.inc:403:0
 #3 0x00007ffff7bc6980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
 #4 0x00007ffff67f4e87 raise /build/glibc-CVJwZb/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007ffff67f67f1 abort /build/glibc-CVJwZb/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007ffff67e63fa __assert_fail_base /build/glibc-CVJwZb/glibc-2.27/assert/assert.c:89:0
 #7 0x00007ffff67e6472 (/lib/x86_64-linux-gnu/libc.so.6+0x30472)
 #8 0x000055555bc09ba9 (/data/llvm-project/build/bin/clang-18+0x66b5ba9)
 #9 0x000055555bc51169 clang::ParmVarDecl::getObjCDeclQualifier() const /data/llvm-project/clang/include/clang/AST/Decl.h:1813:0
#10 0x000055555bc51169 clang::ASTDeclWriter::VisitParmVarDecl(clang::ParmVarDecl*) /data/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp:1171:0
#11 0x000055555bc551cf decltype(auto) llvm::dyn_cast<clang::DeclaratorDecl, clang::Decl>(clang::Decl*) /data/llvm-project/llvm/include/llvm/Support/Casting.h:662:0
#12 0x000055555bc551cf clang::ASTDeclWriter::Visit(clang::Decl*) /data/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp:279:0
#13 0x000055555bc55523 clang::ASTDeclWriter::Emit(clang::Decl*) /data/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp:50:0
#14 0x000055555bc55523 clang::ASTWriter::WriteDecl(clang::ASTContext&, clang::Decl*) /data/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp:2723:0
#15 0x000055555bc45510 clang::ASTWriter::WriteASTCore(clang::Sema&, llvm::StringRef, clang::Module*) /data/llvm-project/clang/lib/Serialization/ASTWriter.cpp:5089:0
#16 0x000055555bc46865 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>::_M_set_length(unsigned long) /usr/include/c++/7/bits/basic_string.h:206:0
#17 0x000055555bc46865 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>::clear() /usr/include/c++/7/bits/basic_string.h:1014:0
#18 0x000055555bc46865 clang::ASTWriter::WriteAST(clang::Sema&, llvm::StringRef, clang::Module*, llvm::StringRef, bool) /data/llvm-project/clang/lib/Serialization/ASTWriter.cpp:4643:0
#19 0x000055555bc64220 std::__shared_ptr_access<clang::PCHBuffer, (__gnu_cxx::_Lock_policy)2, false, false>::_M_get() const /usr/include/c++/7/bits/shared_ptr_base.h:975:0
#20 0x000055555bc64220 std::__shared_ptr_access<clang::PCHBuffer, (__gnu_cxx::_Lock_policy)2, false, false>::operator->() const /usr/include/c++/7/bits/shared_ptr_base.h:969:0
#21 0x000055555bc64220 clang::PCHGenerator::HandleTranslationUnit(clang::ASTContext&) /data/llvm-project/clang/lib/Serialization/GeneratePCH.cpp:68:0
#22 0x000055555bad7c08 clang::MultiplexConsumer::HandleTranslationUnit(clang::ASTContext&) /data/llvm-project/clang/lib/Frontend/MultiplexConsumer.cpp:297:0
#23 0x000055555cd42589 clang::ParseAST(clang::Sema&, bool, bool) /data/llvm-project/clang/lib/Parse/ParseAST.cpp:176:0
#24 0x000055555baa5379 clang::FrontendAction::Execute() /data/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1069:0
#25 0x000055555ba30e50 llvm::Error::setChecked(bool) /data/llvm-project/llvm/include/llvm/Support/Error.h:307:0
#26 0x000055555ba30e50 llvm::Error::operator bool() /data/llvm-project/llvm/include/llvm/Support/Error.h:239:0
#27 0x000055555ba30e50 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /data/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:1057:0
#28 0x000055555bb361f3 std::__shared_ptr_access<clang::FrontendOptions, (__gnu_cxx::_Lock_policy)2, false, false>::_M_get() const /usr/include/c++/7/bits/shared_ptr_base.h:975:0
#29 0x000055555bb361f3 std::__shared_ptr_access<clang::FrontendOptions, (__gnu_cxx::_Lock_policy)2, false, false>::operator*() const /usr/include/c++/7/bits/shared_ptr_base.h:961:0
#30 0x000055555bb361f3 clang::CompilerInvocation::getFrontendOpts() /data/llvm-project/clang/include/clang/Frontend/CompilerInvocation.h:254:0
#31 0x000055555bb361f3 clang::CompilerInstance::getFrontendOpts() /data/llvm-project/clang/include/clang/Frontend/CompilerInstance.h:291:0
#32 0x000055555bb361f3 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /data/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:273:0
#33 0x000055555954097e cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /data/llvm-project/clang/tools/driver/cc1_main.cpp:294:0
#34 0x0000555559537c38 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) /data/llvm-project/clang/tools/driver/driver.cpp:366:0
#35 0x000055555953b0a4 clang_main(int, char**, llvm::ToolContext const&) /data/llvm-project/clang/tools/driver/driver.cpp:407:0
#36 0x000055555954c9e1 main /data/llvm-project/build/tools/clang/tools/driver/clang-driver.cpp:16:0
#37 0x00007ffff67d7c87 __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:344:0
#38 0x0000555559536f6a _start (/data/llvm-project/build/bin/clang-18+0x3fe2f6a)
./test.sh: line 1: 29285 Aborted                 (core dumped) clang++-18 -cc1 -std=c++17 -emit-pch -ferror-limit 0 -o qstyle.cpp.oclango qstyle.cpp
@github-actions github-actions bot added the clang Clang issues not falling into any other category label Dec 27, 2023
@EugeneZelenko EugeneZelenko added clang:frontend Language frontend issues, e.g. anything involving "Sema" crash Prefer [crash-on-valid] or [crash-on-invalid] and removed clang Clang issues not falling into any other category labels Dec 27, 2023
@llvmbot
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llvmbot commented Dec 27, 2023

@llvm/issue-subscribers-clang-frontend

Author: widberg (widberg)

When trying to compile a PCH using the following command on trunk (d51e06c)

test.sh

clang++-18 -cc1 -std=c++17 -emit-pch -o qstyle.cpp.oclango qstyle.cpp

qstyle.cpp (reduced from qtbase via cvise)

template &lt;int... Nx&gt; int stringData(const char (&amp;...x)[Nx]) {
  return 0;
}
int qt_meta_stringdata_CLASSQStyleENDCLASS = stringData(
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
    "", "", "", "", "", "", "", "", "", "");

The command crashes with this backtrace

clang++-18: /data/llvm-project/clang/include/clang/Serialization/ASTWriter.h:901: void clang::BitsPacker::addBits(uint32_t, uint32_t): Assertion `(Value &lt; (1u &lt;&lt; BitsWidth)) &amp;&amp; "Passing narrower bit width!"' 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: clang++-18 -cc1 -std=c++17 -emit-pch -ferror-limit 0 -o qstyle.cpp.oclango qstyle.cpp
1.	&lt;eof&gt; parser at end of file
2.	qstyle.cpp:1:53: serializing 'x'
 #<!-- -->0 0x000055555add97b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) /data/llvm-project/llvm/lib/Support/Unix/Signals.inc:727:0
 #<!-- -->1 0x000055555add72f4 llvm::sys::RunSignalHandlers() /data/llvm-project/llvm/lib/Support/Signals.cpp:105:0
 #<!-- -->2 0x000055555add7f0e SignalHandler(int) /data/llvm-project/llvm/lib/Support/Unix/Signals.inc:403:0
 #<!-- -->3 0x00007ffff7bc6980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
 #<!-- -->4 0x00007ffff67f4e87 raise /build/glibc-CVJwZb/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #<!-- -->5 0x00007ffff67f67f1 abort /build/glibc-CVJwZb/glibc-2.27/stdlib/abort.c:81:0
 #<!-- -->6 0x00007ffff67e63fa __assert_fail_base /build/glibc-CVJwZb/glibc-2.27/assert/assert.c:89:0
 #<!-- -->7 0x00007ffff67e6472 (/lib/x86_64-linux-gnu/libc.so.6+0x30472)
 #<!-- -->8 0x000055555bc09ba9 (/data/llvm-project/build/bin/clang-18+0x66b5ba9)
 #<!-- -->9 0x000055555bc51169 clang::ParmVarDecl::getObjCDeclQualifier() const /data/llvm-project/clang/include/clang/AST/Decl.h:1813:0
#<!-- -->10 0x000055555bc51169 clang::ASTDeclWriter::VisitParmVarDecl(clang::ParmVarDecl*) /data/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp:1171:0
#<!-- -->11 0x000055555bc551cf decltype(auto) llvm::dyn_cast&lt;clang::DeclaratorDecl, clang::Decl&gt;(clang::Decl*) /data/llvm-project/llvm/include/llvm/Support/Casting.h:662:0
#<!-- -->12 0x000055555bc551cf clang::ASTDeclWriter::Visit(clang::Decl*) /data/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp:279:0
#<!-- -->13 0x000055555bc55523 clang::ASTDeclWriter::Emit(clang::Decl*) /data/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp:50:0
#<!-- -->14 0x000055555bc55523 clang::ASTWriter::WriteDecl(clang::ASTContext&amp;, clang::Decl*) /data/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp:2723:0
#<!-- -->15 0x000055555bc45510 clang::ASTWriter::WriteASTCore(clang::Sema&amp;, llvm::StringRef, clang::Module*) /data/llvm-project/clang/lib/Serialization/ASTWriter.cpp:5089:0
#<!-- -->16 0x000055555bc46865 std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;::_M_set_length(unsigned long) /usr/include/c++/7/bits/basic_string.h:206:0
#<!-- -->17 0x000055555bc46865 std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;::clear() /usr/include/c++/7/bits/basic_string.h:1014:0
#<!-- -->18 0x000055555bc46865 clang::ASTWriter::WriteAST(clang::Sema&amp;, llvm::StringRef, clang::Module*, llvm::StringRef, bool) /data/llvm-project/clang/lib/Serialization/ASTWriter.cpp:4643:0
#<!-- -->19 0x000055555bc64220 std::__shared_ptr_access&lt;clang::PCHBuffer, (__gnu_cxx::_Lock_policy)2, false, false&gt;::_M_get() const /usr/include/c++/7/bits/shared_ptr_base.h:975:0
#<!-- -->20 0x000055555bc64220 std::__shared_ptr_access&lt;clang::PCHBuffer, (__gnu_cxx::_Lock_policy)2, false, false&gt;::operator-&gt;() const /usr/include/c++/7/bits/shared_ptr_base.h:969:0
#<!-- -->21 0x000055555bc64220 clang::PCHGenerator::HandleTranslationUnit(clang::ASTContext&amp;) /data/llvm-project/clang/lib/Serialization/GeneratePCH.cpp:68:0
#<!-- -->22 0x000055555bad7c08 clang::MultiplexConsumer::HandleTranslationUnit(clang::ASTContext&amp;) /data/llvm-project/clang/lib/Frontend/MultiplexConsumer.cpp:297:0
#<!-- -->23 0x000055555cd42589 clang::ParseAST(clang::Sema&amp;, bool, bool) /data/llvm-project/clang/lib/Parse/ParseAST.cpp:176:0
#<!-- -->24 0x000055555baa5379 clang::FrontendAction::Execute() /data/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1069:0
#<!-- -->25 0x000055555ba30e50 llvm::Error::setChecked(bool) /data/llvm-project/llvm/include/llvm/Support/Error.h:307:0
#<!-- -->26 0x000055555ba30e50 llvm::Error::operator bool() /data/llvm-project/llvm/include/llvm/Support/Error.h:239:0
#<!-- -->27 0x000055555ba30e50 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) /data/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:1057:0
#<!-- -->28 0x000055555bb361f3 std::__shared_ptr_access&lt;clang::FrontendOptions, (__gnu_cxx::_Lock_policy)2, false, false&gt;::_M_get() const /usr/include/c++/7/bits/shared_ptr_base.h:975:0
#<!-- -->29 0x000055555bb361f3 std::__shared_ptr_access&lt;clang::FrontendOptions, (__gnu_cxx::_Lock_policy)2, false, false&gt;::operator*() const /usr/include/c++/7/bits/shared_ptr_base.h:961:0
#<!-- -->30 0x000055555bb361f3 clang::CompilerInvocation::getFrontendOpts() /data/llvm-project/clang/include/clang/Frontend/CompilerInvocation.h:254:0
#<!-- -->31 0x000055555bb361f3 clang::CompilerInstance::getFrontendOpts() /data/llvm-project/clang/include/clang/Frontend/CompilerInstance.h:291:0
#<!-- -->32 0x000055555bb361f3 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /data/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:273:0
#<!-- -->33 0x000055555954097e cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) /data/llvm-project/clang/tools/driver/cc1_main.cpp:294:0
#<!-- -->34 0x0000555559537c38 ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) /data/llvm-project/clang/tools/driver/driver.cpp:366:0
#<!-- -->35 0x000055555953b0a4 clang_main(int, char**, llvm::ToolContext const&amp;) /data/llvm-project/clang/tools/driver/driver.cpp:407:0
#<!-- -->36 0x000055555954c9e1 main /data/llvm-project/build/tools/clang/tools/driver/clang-driver.cpp:16:0
#<!-- -->37 0x00007ffff67d7c87 __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:344:0
#<!-- -->38 0x0000555559536f6a _start (/data/llvm-project/build/bin/clang-18+0x3fe2f6a)
./test.sh: line 1: 29285 Aborted                 (core dumped) clang++-18 -cc1 -std=c++17 -emit-pch -ferror-limit 0 -o qstyle.cpp.oclango qstyle.cpp

@shafik
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shafik commented Dec 28, 2023

CC @ChuanqiXu9

It looks like you added this assert in 48be81e

When debugging this I see:

frame var Value
(uint32_t) Value = 256
frame var BitsWidth
(uint32_t) BitsWidth = 8
expr 1u << 8
(unsigned int) $0 = 256

So your assuming that 8 is the largest bit width but if we look here:

llvm-project/clang/include/clang/AST/Decl.h

Lines 1928 to 1931 in fdb8764

unsigned getParameterIndex() const {
unsigned d = ParmVarDeclBits.ParameterIndex;
return d == ParameterIndexSentinel ? getParameterIndexLarge() : d;
}

we can see that if d ==255 then we call getParameterIndexLarge() which AFAICT is not limited to a bit-width of 8.

@shafik shafik added the confirmed Verified by a second party label Dec 28, 2023
@ChuanqiXu9
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CC @ChuanqiXu9

It looks like you added this assert in 48be81e

When debugging this I see:

frame var Value
(uint32_t) Value = 256
frame var BitsWidth
(uint32_t) BitsWidth = 8
expr 1u << 8
(unsigned int) $0 = 256

So your assuming that 8 is the largest bit width but if we look here:

llvm-project/clang/include/clang/AST/Decl.h

Lines 1928 to 1931 in fdb8764

unsigned getParameterIndex() const {
unsigned d = ParmVarDeclBits.ParameterIndex;
return d == ParameterIndexSentinel ? getParameterIndexLarge() : d;
}

we can see that if d ==255 then we call getParameterIndexLarge() which AFAICT is not limited to a bit-width of 8.

Oh, my bad.

My motivation was that I see the size of ParameterIndex is limited to 8:

llvm-project/clang/include/clang/AST/Decl.h

Lines 989 to 1035 in fdb8764

enum { NumParameterIndexBits = 8 };
enum DefaultArgKind {
DAK_None,
DAK_Unparsed,
DAK_Uninstantiated,
DAK_Normal
};
enum { NumScopeDepthOrObjCQualsBits = 7 };
class ParmVarDeclBitfields {
friend class ASTDeclReader;
friend class ParmVarDecl;
LLVM_PREFERRED_TYPE(VarDeclBitfields)
unsigned : NumVarDeclBits;
/// Whether this parameter inherits a default argument from a
/// prior declaration.
LLVM_PREFERRED_TYPE(bool)
unsigned HasInheritedDefaultArg : 1;
/// Describes the kind of default argument for this parameter. By default
/// this is none. If this is normal, then the default argument is stored in
/// the \c VarDecl initializer expression unless we were unable to parse
/// (even an invalid) expression for the default argument.
LLVM_PREFERRED_TYPE(DefaultArgKind)
unsigned DefaultArgKind : 2;
/// Whether this parameter undergoes K&R argument promotion.
LLVM_PREFERRED_TYPE(bool)
unsigned IsKNRPromoted : 1;
/// Whether this parameter is an ObjC method parameter or not.
LLVM_PREFERRED_TYPE(bool)
unsigned IsObjCMethodParam : 1;
/// If IsObjCMethodParam, a Decl::ObjCDeclQualifier.
/// Otherwise, the number of function parameter scopes enclosing
/// the function parameter scope in which this parameter was
/// declared.
unsigned ScopeDepthOrObjCQuals : NumScopeDepthOrObjCQualsBits;
/// The number of parameters preceding this parameter in the
/// function parameter scope in which it was declared.
unsigned ParameterIndex : NumParameterIndexBits;

I didn't notice there is getParameterIndexLarge(). I'll try to fix this.

@ChuanqiXu9 ChuanqiXu9 self-assigned this Dec 28, 2023
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@shafik @widberg @EugeneZelenko @llvmbot @ChuanqiXu9