llvm - Remove Successors for each BB -


i need remove successors every basic block insert new ones

i tried code, doesn't work

void removesuccessor(terminatorinst *ti, unsigned succnum) {     assert(succnum < ti->getnumsuccessors() &&             "trying remove nonexistant successor!");      // if our old successor block contains phi nodes, remove entry in     // phi nodes comes branch...     //     basicblock *bb = ti->getparent();     ti->getsuccessor(succnum)->removepredecessor(bb);      terminatorinst *newti = 0;     switch (ti->getopcode()) {         case instruction::br:             // if conditional branch... convert unconditional branch.             if (ti->getnumsuccessors() == 2) {                 cast<branchinst>(ti)->setunconditionaldest(ti->getsuccessor(1-succnum));             } else {                    // otherwise convert return instruction...                 value *retval = 0;                  // create value return... if function doesn't return null...                 if (!(bb->getparent()->getreturntype())->isvoidty())                     retval = constant::getnullvalue(bb->getparent()->getreturntype());                 // create return...                 newti = 0;             }             break;          case instruction::invoke:    // should convert call         case instruction::switch:    // should remove entry         default:         case instruction::ret:       // cannot happen, has no successors!             assert(0 && "unhandled terminator instruction type in removesuccessor!");             abort();     }      if (newti)   // if it's different instruction, replace.         replaceinstwithinst(ti, newti); }

example of results:

if.then:                                          ; preds = %for.inc, %entry, %for.body

preds should not include %for.body according remove successors of %for.body before inserting new successors

beyond comment above asking clarifications, line seems fishy:

cast<branchinst>(ti)->setunconditionaldest(ti->getsuccessor(1-succnum));

from know setunconditionaldest() method have been removed years ago, version using? in case, recommend creating new unconditional branchinst, using replaceinstwithinst() replace conditional one.


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