/** Generate code */
public void write(Environment env, DataOutputStream out, MemberDefinition field, ConstantPool tab)
throws IOException {
// listing(System.out);
if ((field != null) && field.getArguments() != null) {
int sum = 0;
Vector v = field.getArguments();
for (Enumeration e = v.elements(); e.hasMoreElements(); ) {
MemberDefinition f = ((MemberDefinition) e.nextElement());
sum += f.getType().stackSize();
}
maxvar = sum;
}
// Make sure the stack balances. Also calculate maxvar and maxstack
try {
balance(first, 0);
} catch (CompilerError e) {
System.out.println("ERROR: " + e);
listing(System.out);
throw e;
}
// Assign PCs
int pc = 0, nexceptions = 0;
for (Instruction inst = first; inst != null; inst = inst.next) {
inst.pc = pc;
int sz = inst.size(tab);
if (pc < 65536 && (pc + sz) >= 65536) {
env.error(inst.where, "warn.method.too.long");
}
pc += sz;
if (inst.opc == opc_try) {
nexceptions += ((TryData) inst.value).catches.size();
}
}
// Write header
out.writeShort(maxdepth);
out.writeShort(maxvar);
out.writeInt(maxpc = pc);
// Generate code
for (Instruction inst = first.next; inst != null; inst = inst.next) {
inst.write(out, tab);
}
// write exceptions
out.writeShort(nexceptions);
if (nexceptions > 0) {
// listing(System.out);
writeExceptions(env, out, tab, first, last);
}
}
/** Collect all constants into the constant table */
public void collect(Environment env, MemberDefinition field, ConstantPool tab) {
// Collect constants for arguments only
// if a local variable table is generated
if ((field != null) && env.debug_vars()) {
if (field.getArguments() != null) {
for (Enumeration e = field.getArguments().elements(); e.hasMoreElements(); ) {
MemberDefinition f = (MemberDefinition) e.nextElement();
tab.put(f.getName().toString());
tab.put(f.getType().getTypeSignature());
}
}
}
// Collect constants from the instructions
for (Instruction inst = first; inst != null; inst = inst.next) {
inst.collect(tab);
}
}
/**
* Write the local variable table. The necessary constants have already been added to the constant
* table by the collect() method. The flowFields method is used to determine which variables are
* alive at each pc.
*/
public void writeLocalVariableTable(
Environment env, MemberDefinition field, DataOutputStream out, ConstantPool tab)
throws IOException {
MemberDefinition locals[] = new MemberDefinition[maxvar];
int i = 0;
// Initialize arguments
if ((field != null) && (field.getArguments() != null)) {
int reg = 0;
Vector v = field.getArguments();
for (Enumeration e = v.elements(); e.hasMoreElements(); ) {
MemberDefinition f = ((MemberDefinition) e.nextElement());
locals[reg] = f;
reg += f.getType().stackSize();
}
}
flowFields(env, first, locals);
LocalVariableTable lvtab = new LocalVariableTable();
// Initialize arguments again
for (i = 0; i < maxvar; i++) locals[i] = null;
if ((field != null) && (field.getArguments() != null)) {
int reg = 0;
Vector v = field.getArguments();
for (Enumeration e = v.elements(); e.hasMoreElements(); ) {
MemberDefinition f = ((MemberDefinition) e.nextElement());
locals[reg] = f;
lvtab.define(f, reg, 0, maxpc);
reg += f.getType().stackSize();
}
}
int pcs[] = new int[maxvar];
for (Instruction inst = first; inst != null; inst = inst.next) {
switch (inst.opc) {
case opc_istore:
case opc_istore_0:
case opc_istore_1:
case opc_istore_2:
case opc_istore_3:
case opc_fstore:
case opc_fstore_0:
case opc_fstore_1:
case opc_fstore_2:
case opc_fstore_3:
case opc_astore:
case opc_astore_0:
case opc_astore_1:
case opc_astore_2:
case opc_astore_3:
case opc_lstore:
case opc_lstore_0:
case opc_lstore_1:
case opc_lstore_2:
case opc_lstore_3:
case opc_dstore:
case opc_dstore_0:
case opc_dstore_1:
case opc_dstore_2:
case opc_dstore_3:
if (inst.value instanceof LocalVariable) {
LocalVariable v = (LocalVariable) inst.value;
int pc = (inst.next != null) ? inst.next.pc : inst.pc;
if (locals[v.slot] != null) {
lvtab.define(locals[v.slot], v.slot, pcs[v.slot], pc);
}
pcs[v.slot] = pc;
locals[v.slot] = v.field;
}
break;
case opc_label:
{
// flush previous labels
for (i = 0; i < maxvar; i++) {
if (locals[i] != null) {
lvtab.define(locals[i], i, pcs[i], inst.pc);
}
}
// init new labels
int pc = inst.pc;
MemberDefinition[] labelLocals = ((Label) inst).locals;
if (labelLocals == null) { // unreachable code??
for (i = 0; i < maxvar; i++) locals[i] = null;
} else {
System.arraycopy(labelLocals, 0, locals, 0, maxvar);
}
for (i = 0; i < maxvar; i++) {
pcs[i] = pc;
}
break;
}
}
}
// flush remaining labels
for (i = 0; i < maxvar; i++) {
if (locals[i] != null) {
lvtab.define(locals[i], i, pcs[i], maxpc);
}
}
// write the local variable table
lvtab.write(env, out, tab);
}