/**
* Replaces the last insn in this block. The provided insn must have some branchingness.
*
* @param insn {@code non-null;} rop-form insn to add, which must branch.
*/
public void replaceLastInsn(Insn insn) {
if (insn.getOpcode().getBranchingness() == Rop.BRANCH_NONE) {
throw new IllegalArgumentException("last insn must branch");
}
SsaInsn oldInsn = insns.get(insns.size() - 1);
SsaInsn newInsn = SsaInsn.makeFromRop(insn, this);
insns.set(insns.size() - 1, newInsn);
parent.onInsnRemoved(oldInsn);
parent.onInsnAdded(newInsn);
}
/**
* Replaces an SsaInsn containing a PlainInsn with a new PlainInsn. The new PlainInsn is
* constructed with a new RegOp and new sources.
*
* <p>TODO move this somewhere else.
*
* @param insn {@code non-null;} an SsaInsn containing a PlainInsn
* @param newSources {@code non-null;} new sources list for new insn
* @param newOpcode A RegOp from {@link RegOps}
* @param cst {@code null-ok;} constant for new instruction, if any
*/
private void replacePlainInsn(
NormalSsaInsn insn, RegisterSpecList newSources, int newOpcode, Constant cst) {
Insn originalRopInsn = insn.getOriginalRopInsn();
Rop newRop = Rops.ropFor(newOpcode, insn.getResult(), newSources, cst);
Insn newRopInsn;
if (cst == null) {
newRopInsn =
new PlainInsn(newRop, originalRopInsn.getPosition(), insn.getResult(), newSources);
} else {
newRopInsn =
new PlainCstInsn(
newRop, originalRopInsn.getPosition(), insn.getResult(), newSources, cst);
}
NormalSsaInsn newInsn = new NormalSsaInsn(newRopInsn, insn.getBlock());
List<SsaInsn> insns = insn.getBlock().getInsns();
ssaMeth.onInsnRemoved(insn);
insns.set(insns.lastIndexOf(insn), newInsn);
ssaMeth.onInsnAdded(newInsn);
}