valgrind error at CodeGenModule.cpp:2531

[dcb314]

From the clang testsuite, file ./Analysis/analysis-after-multiple-dtors.cpp
does this with a valgrind version of recent clang:

test $ valgrind -q --trace-children=yes ~/llvm/results/bin/clang++ -c -w ./Analysis/analysis-after-multiple-dtors.cpp
==424675== Conditional jump or move depends on uninitialised value(s)
==424675== at 0x2429FF9: clang::CodeGen::CodeGenModule::SetLLVMFunctionAttributesForDefinition(clang::Decl const*, llvm::Function*) (CodeGenModule.cpp:2531)
==424675== by 0x26F5B23: clang::CodeGen::CodeGenModule::codegenCXXStructor(clang::GlobalDecl) (CGCXX.cpp:216)

The source code line in error is

if (isa<CXXMethodDecl>(D) && F->getPointerAlignment(getDataLayout()) < 2)

The bug first seems to occur sometime between git hash 1579e9c and 8364659.

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: None (dcb314)

From the clang testsuite, file ./Analysis/analysis-after-multiple-dtors.cpp does this with a valgrind version of recent clang:

test $ valgrind -q --trace-children=yes ~/llvm/results/bin/clang++ -c -w ./Analysis/analysis-after-multiple-dtors.cpp
==424675== Conditional jump or move depends on uninitialised value(s)
==424675== at 0x2429FF9: clang::CodeGen::CodeGenModule::SetLLVMFunctionAttributesForDefinition(clang::Decl const*, llvm::Function*) (CodeGenModule.cpp:2531)
==424675== by 0x26F5B23: clang::CodeGen::CodeGenModule::codegenCXXStructor(clang::GlobalDecl) (CGCXX.cpp:216)

The source code line in error is

if (isa<CXXMethodDecl>(D) && F->getPointerAlignment(getDataLayout()) < 2)

The bug first seems to occur sometime between git hash 1579e9c and 8364659.

[vgvassilev]

I believe the regression was introduced in 196c144...