https://llvm.org/bugs/show_bug.cgi?id=28185
Bug ID: 28185
Summary: CFI ICall metadata is generated incorrectly for
functions with void parameter
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: d.c.d...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
When compiling the attached testcase with CFI ICall enabled, the metadata that
is generated is incorrect: the callsite has metadata "_ZTSFivE", and the
potential call target has metadata "_ZTSFiE". As a result, the LowerBitSets
pass in LLVM does not realize that this is a potential valid call target. But,
according to both the C and C++ specifications, functions with a single void
parameter are equivalent to the same function with an empty parameter list.
Unfortunately, I am not familiar enough with the Clang front-end to track down
the source of the bug. However, the key difference is that when
"CreateMetadataIdentifierForType(QualType(FnType, 0))" is called in
"CodeGenFunction::EmitCall()", in one instance the "FnType" variable is of type
"FunctionProtoType", whereas in the other instance it is of type
"FunctionNoProtoType". Then, when the Itanium name mangler is called at
"CXXNameMangler::mangleType()", the mangled name is represented differently.
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