http://llvm.org/bugs/show_bug.cgi?id=13515
Bug #: 13515
Summary: JIT::runFunction() creates stubs with internal linkage
Product: libraries
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: Target-Independent JIT
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
JIT::runFunction() creates stubs with internal linkage:
"
// First, create the function.
FunctionType *STy=FunctionType::get(RetTy, false);
Function *Stub = Function::Create(STy, Function::InternalLinkage, "",
F->getParent());
"
However, this is not fine when the executed function calls certain module
passes, like the inliner. The inliner removes all unreachable internal
functions, and therefore the stub function will be deleted before it returns,
thus leading to crashes.
I can see two solutions:
- create stubs with external linkage
- add the stubs to @llvm.compiler.used
Probably the 2nd solution is overkill, and I can't see any real drawback of
solution 1).
MCJIT doesn't implement a fallback mechanism for the fast-path yet, so it
doesn't suffer from this bug.
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