private void atSwitchStmnt(Stmnt st) throws CompileError {
compileExpr(st.head());
ArrayList prevBreakList = breakList;
breakList = new ArrayList();
int opcodePc = bytecode.currentPc();
bytecode.addOpcode(LOOKUPSWITCH);
int npads = 3 - (opcodePc & 3);
while (npads-- > 0) bytecode.add(0);
Stmnt body = (Stmnt) st.tail();
int npairs = 0;
for (ASTList list = body; list != null; list = list.tail())
if (((Stmnt) list.head()).getOperator() == CASE) ++npairs;
// opcodePc2 is the position at which the default jump offset is.
int opcodePc2 = bytecode.currentPc();
bytecode.addGap(4);
bytecode.add32bit(npairs);
bytecode.addGap(npairs * 8);
long[] pairs = new long[npairs];
int ipairs = 0;
int defaultPc = -1;
for (ASTList list = body; list != null; list = list.tail()) {
Stmnt label = (Stmnt) list.head();
int op = label.getOperator();
if (op == DEFAULT) defaultPc = bytecode.currentPc();
else if (op != CASE) fatal();
else {
pairs[ipairs++] =
((long) computeLabel(label.head()) << 32)
+ ((long) (bytecode.currentPc() - opcodePc) & 0xffffffff);
}
hasReturned = false;
((Stmnt) label.tail()).accept(this);
}
Arrays.sort(pairs);
int pc = opcodePc2 + 8;
for (int i = 0; i < npairs; ++i) {
bytecode.write32bit(pc, (int) (pairs[i] >>> 32));
bytecode.write32bit(pc + 4, (int) pairs[i]);
pc += 8;
}
if (defaultPc < 0 || breakList.size() > 0) hasReturned = false;
int endPc = bytecode.currentPc();
if (defaultPc < 0) defaultPc = endPc;
bytecode.write32bit(opcodePc2, defaultPc - opcodePc);
patchGoto(breakList, endPc);
breakList = prevBreakList;
}
private void atPlusPlus(int token, ASTree oprand, Expr expr, boolean doDup) throws CompileError {
boolean isPost = oprand == null; // ++i or i++?
if (isPost) oprand = expr.oprand2();
if (oprand instanceof Variable) {
Declarator d = ((Variable) oprand).getDeclarator();
int t = exprType = d.getType();
arrayDim = d.getArrayDim();
int var = getLocalVar(d);
if (arrayDim > 0) badType(expr);
if (t == DOUBLE) {
bytecode.addDload(var);
if (doDup && isPost) bytecode.addOpcode(DUP2);
bytecode.addDconst(1.0);
bytecode.addOpcode(token == PLUSPLUS ? DADD : DSUB);
if (doDup && !isPost) bytecode.addOpcode(DUP2);
bytecode.addDstore(var);
} else if (t == LONG) {
bytecode.addLload(var);
if (doDup && isPost) bytecode.addOpcode(DUP2);
bytecode.addLconst((long) 1);
bytecode.addOpcode(token == PLUSPLUS ? LADD : LSUB);
if (doDup && !isPost) bytecode.addOpcode(DUP2);
bytecode.addLstore(var);
} else if (t == FLOAT) {
bytecode.addFload(var);
if (doDup && isPost) bytecode.addOpcode(DUP);
bytecode.addFconst(1.0f);
bytecode.addOpcode(token == PLUSPLUS ? FADD : FSUB);
if (doDup && !isPost) bytecode.addOpcode(DUP);
bytecode.addFstore(var);
} else if (t == BYTE || t == CHAR || t == SHORT || t == INT) {
if (doDup && isPost) bytecode.addIload(var);
int delta = token == PLUSPLUS ? 1 : -1;
if (var > 0xff) {
bytecode.addOpcode(WIDE);
bytecode.addOpcode(IINC);
bytecode.addIndex(var);
bytecode.addIndex(delta);
} else {
bytecode.addOpcode(IINC);
bytecode.add(var);
bytecode.add(delta);
}
if (doDup && !isPost) bytecode.addIload(var);
} else badType(expr);
} else {
if (oprand instanceof Expr) {
Expr e = (Expr) oprand;
if (e.getOperator() == ARRAY) {
atArrayPlusPlus(token, isPost, e, doDup);
return;
}
}
atFieldPlusPlus(token, isPost, oprand, expr, doDup);
}
}