Proper method to initialize all LLVM Internal Data Structures?

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1

Hi:
I’m building a small tool on top of LLVM Core Library.

LLVMContext context;
SMDiagnostic diag;
Module *M = parseIRFile(InputIR, diag, context).get();
if (M == nullptr) {
diag.print("LLVM", errs());
exit(-1);
}
assert(M->isMaterialized() && "Module not materialized!");
PointerType *ArrayPtrTy =
M->getTypeByName("struct._Array")->getPointerTo();

However this piece of code crashes at Module::getTypeByName because getContext().pImpl is NULL pointer. Other similar issues include Module::getTypeByName results in a NULL pointer dereference because TheTable in StringMap is not allocated/initialized.

It would be great if someone could show me what’s the correct way to initialize all this kind of internal data structures so I could focus on my tool’s logic

2

I’m using LLVM6.0 Release version on macOS

Zhang

3

This line looks incorrect

Module *M = parseIRFile(InputIR, diag, context).get();

parseIRFile returns a unique_ptr, you called “get()” on it and captured the value of the ptr, but the temporary unique_ptr was not invalidated. So its destructor still ran and deleted the module out from under you. You should use std::unique_ptr M to maintain ownership.

~Craig