[llvm-bugs] [Bug 25764] New: isa<> used on a null pointer in CodeGenPrepare::dupRetToEnableTailCallOpts

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25764

            Bug ID: 25764
           Summary: isa<> used on a null pointer in
                    CodeGenPrepare::dupRetToEnableTailCallOpts
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: yaron.keren at gmail.com
                CC: benny.kra at gmail.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15407
  --> https://llvm.org/bugs/attachment.cgi?id=15407&action=edit
creduced example

compiling

#include <list>
#include <vector>
using namespace std;
int main() {
  list<int> c1;
  vector<list<int>> cc;
  cc.insert(cc.begin(), {c1});
}


with

>clang  -O -g -target x86_64-pc-windows -fexceptions lexicomp1.cpp

results in Assertion failed: Val && "isa<> used on a null pointer" originating
from the dyn_cast

bool CodeGenPrepare::dupRetToEnableTailCallOpts(BasicBlock *BB) {
  if (!TLI)
    return false;

  ReturnInst *RI = dyn_cast<ReturnInst>(BB->getTerminator());

where BB->getTerminator() is nullptr.

This could be fixed with dyn_cast_or_null but I don't know if this is correct
or if a nullptr BB->getTerminator() indicates a real problem which should be
fixed elsewhere.

Also attached is reduced example, as far as creduce could go (77 lines, no
external includes) if it is any help.

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