¶MachineBasicBlock::iterator
findSplitPointForStackProtector(
    llvm::MachineBasicBlock* BB,
    const llvm::TargetInstrInfo& TII)

Description

Find the split point at which to splice the end of BB into its success stack protector check machine basic block. On many platforms, due to ABI constraints, terminators, even before register allocation, use physical registers. This creates an issue for us since physical registers at this point can not travel across basic blocks. Luckily, selectiondag always moves physical registers into vregs when they enter functions and moves them through a sequence of copies back into the physical registers right before the terminator creating a ``Terminator Sequence''. This function is searching for the beginning of the terminator sequence so that we can ensure that we splice off not just the terminator, but additionally the copies that move the vregs into the physical registers.

Declared at: llvm/include/llvm/CodeGen/CodeGenCommonISel.h:213

Parameters

llvm::MachineBasicBlock* BB

const llvm::TargetInstrInfo& TII