public void applyPreMeetHandler() {
IRScope s = problem.getScope();
if (s instanceof IRClosure && basicBlock == s.getCFG().getEntryBB()) {
// If it is not null, it has already been initialized
if (inState == null) {
inState = new UnboxState();
}
} else {
inState = new UnboxState();
}
}
@Override
public Object execute(IRScope s, Object... data) {
StoreLocalVarPlacementProblem slvp = new StoreLocalVarPlacementProblem();
// Only run if we are pushing a scope or we are reusing the parents scope.
if (!s.getFlags().contains(IRFlags.DYNSCOPE_ELIMINATED)
|| s.getFlags().contains(IRFlags.REUSE_PARENT_DYNSCOPE)) {
// Make sure flags are computed
s.computeScopeFlags();
Map<Operand, Operand> varRenameMap = new HashMap<Operand, Operand>();
// 1. Figure out required stores
// 2. Add stores
// 3. Figure out required loads
// 4. Add loads
//
// Order is important since loads in 3. depend on stores in 2.
slvp.setup(s);
slvp.compute_MOP_Solution();
// Add stores, assigning an equivalent tmp-var for each local var
slvp.addStores(varRenameMap);
// Once stores have been added, figure out required loads
LoadLocalVarPlacementProblem llvp = new LoadLocalVarPlacementProblem();
llvp.setup(s);
llvp.compute_MOP_Solution();
// Add loads
llvp.addLoads(varRenameMap);
// Rename all local var uses with their tmp-var stand-ins
for (BasicBlock b : s.getCFG().getBasicBlocks()) {
for (Instr i : b.getInstrs()) i.renameVars(varRenameMap);
}
// Run on all nested closures.
//
// In the current implementation, nested scopes are processed independently (unlike Live
// Variable Analysis)
for (IRClosure c : s.getClosures()) run(c, false, true);
// LVA information is no longer valid after this pass
// FIXME: Grrr ... this seems broken to have to create a new object to invalidate
(new LiveVariableAnalysis()).invalidate(s);
}
s.setDataFlowSolution(StoreLocalVarPlacementProblem.NAME, slvp);
return slvp;
}