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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Fatal error in clang/lib/AST/DeclPrinter.cpp"
href="https://bugs.llvm.org/show_bug.cgi?id=44420">44420</a>
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<th>Summary</th>
<td>Fatal error in clang/lib/AST/DeclPrinter.cpp
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>9.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hav467614@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>Created <span class=""><a href="attachment.cgi?id=22974" name="attach_22974" title="clang/lib/AST/DeclPrinter.cpp">attachment 22974</a> <a href="attachment.cgi?id=22974&action=edit" title="clang/lib/AST/DeclPrinter.cpp">[details]</a></span>
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;
}</pre>
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