private void updateUnboxedVarsInfo(
Instr i, UnboxState state, Variable dst, boolean hasRescuer, boolean isDFBarrier) {
HashSet<Variable> varsToBox = new HashSet<Variable>();
// Special treatment for instructions that can raise exceptions
if (i.canRaiseException()) {
if (hasRescuer) {
// If we are going to be rescued,
// box all unboxed dirty vars before we execute the instr.
state.unboxedDirtyVars.clear();
} else {
// We are going to exit if an exception is raised.
// So, only need to bother with dirty live local vars for closures
if (problem.getScope() instanceof IRClosure) {
markLocalVariables(varsToBox, state.unboxedDirtyVars);
}
}
}
if (isDFBarrier) {
// All dirty unboxed local vars will get reboxed.
markLocalVariables(varsToBox, state.unboxedDirtyVars);
// We have to re-unbox local variables as necessary since we don't
// know how they are going to change once we get past this instruction.
List<Variable> lvs = new ArrayList<Variable>();
markLocalVariables(lvs, state.unboxedVars.keySet());
state.unboxedVars.keySet().removeAll(lvs);
}
// Update set of unboxed dirty vars
state.unboxedDirtyVars.removeAll(varsToBox);
// FIXME: Also global variables .. see LVA / StoreLocalVar analysis.
// B_TRUE and B_FALSE have unboxed forms and their operands
// needn't get boxed back.
Operation op = i.getOperation();
if (op != Operation.B_TRUE && op != Operation.B_FALSE) {
// Vars used by this instruction that only exist in unboxed form
// will have to get boxed before it is executed
state.unboxedDirtyVars.removeAll(i.getUsedVariables());
}
// If the instruction writes into 'dst', it will be in boxed form.
if (dst != null) {
state.unboxedVars.remove(dst);
state.unboxedDirtyVars.remove(dst);
}
}
private void boxRequiredVars(
Instr i,
UnboxState state,
Map<Variable, TemporaryLocalVariable> unboxMap,
Variable dst,
boolean hasRescuer,
boolean isDFBarrier,
List<Instr> newInstrs) {
// Special treatment for instructions that can raise exceptions
boolean isClosure = problem.getScope() instanceof IRClosure;
HashSet<Variable> varsToBox = new HashSet<Variable>();
if (i.canRaiseException()) {
if (hasRescuer) {
// If we are going to be rescued,
// box all unboxed dirty vars before we execute the instr
varsToBox.addAll(state.unboxedDirtyVars);
} else if (isClosure) {
// We are going to exit if an exception is raised.
// So, only need to bother with dirty live local vars for closures
markLocalVariables(varsToBox, state.unboxedDirtyVars);
}
}
if (isClosure && (i instanceof ReturnInstr || i instanceof BreakInstr)) {
markLocalVariables(varsToBox, state.unboxedDirtyVars);
}
if (isDFBarrier) {
// All dirty unboxed (local) vars will get reboxed.
markLocalVariables(varsToBox, state.unboxedDirtyVars);
// We have to re-unbox local variables as necessary since we don't
// know how they are going to change once we get past this instruction.
List<Variable> lvs = new ArrayList<Variable>();
markLocalVariables(lvs, state.unboxedVars.keySet());
state.unboxedVars.keySet().removeAll(lvs);
}
// B_TRUE and B_FALSE have unboxed forms and their operands
// needn't get boxed back.
Operation op = i.getOperation();
boolean isBranch = op == Operation.B_TRUE || op == Operation.B_FALSE;
if (!isBranch) {
// Vars used by this instruction that only exist in unboxed form
// will have to get boxed before it is executed
for (Variable v : i.getUsedVariables()) {
if (state.unboxedDirtyVars.contains(v)) {
varsToBox.add(v);
}
}
}
// Add boxing instrs.
for (Variable v : varsToBox) {
boxVar(state, state.unboxedVars.get(v), unboxMap, v, newInstrs);
}
// Add 'i' itself
if (isBranch) {
OneOperandBranchInstr bi = (OneOperandBranchInstr) i;
Operand a = bi.getArg1();
Operand ua = getUnboxedOperand(state, unboxMap, a);
if (ua == a) {
newInstrs.add(i);
} else if (op == Operation.B_TRUE) {
newInstrs.add(new BTrueInstr(Operation.B_TRUE, ua, bi.getJumpTarget()));
} else {
newInstrs.add(new BFalseInstr(Operation.B_FALSE, ua, bi.getJumpTarget()));
}
} else {
newInstrs.add(i);
}
// If the instruction writes into 'dst', it will be in boxed form.
if (dst != null) {
state.unboxedVars.remove(dst);
state.unboxedDirtyVars.remove(dst);
}
}