https://bugs.llvm.org/show_bug.cgi?id=44420
Bug ID: 44420
Summary: Fatal error in clang/lib/AST/DeclPrinter.cpp
Product: clang
Version: 9.0
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: hav467...@gmail.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Created attachment 22974
--> https://bugs.llvm.org/attachment.cgi?id=22974&action=edit
clang/lib/AST/DeclPrinter.cpp
A fatal error causes the program to crash, because the program tries to access
a NULL BaseType.
The following is where the bug happens, and I add comments about the bug in the
code.
//In clang/lib/AST/DeclPrinter.cpp at line 143:
static QualType GetBaseType(QualType T) {
// FIXME: This should be on the Type class!
QualType BaseType = T;
while (!BaseType->isSpecifierType()) {
//3. crash here because BaseType is
NULL, Description: Assertion failed: !isNull() && "Cannot retrieve a NULL type
pointer", file clang/AST/Type.h, line 659
if (const PointerType *PTy = BaseType->getAs<PointerType>())
BaseType = PTy->getPointeeType();
else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
BaseType = BPy->getPointeeType();
else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
BaseType = ATy->getElementType();
else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
BaseType = FTy->getReturnType();
//1. go here Firstly
else if (const VectorType *VTy = BaseType->getAs<VectorType>())
BaseType = VTy->getElementType();
else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
BaseType = RTy->getPointeeType();
else if (const AutoType *ATy = BaseType->getAs<AutoType>())
BaseType = ATy->getDeducedType();
//2. go here and return NULL!!!
else if (const ParenType *PTy = BaseType->getAs<ParenType>())
BaseType = PTy->desugar();
else
// This must be a syntax error.
break;
}
return BaseType;
}
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