void write(ClassEnv e, CodeAttr ce, DataOutputStream out) throws IOException, jasError {
if (wide) {
target.writeWideOffset(ce, source, out);
} else {
int offset = ce.getPc(target);
if (source != null) offset -= ce.getPc(source);
if (offset > 32767 || offset < -32768)
throw new jasError("reference from line " + ref + " exceed size for short");
target.writeOffset(ce, source, out);
}
}
int size(ClassEnv ce, CodeAttr code) throws jasError {
int sz = 8; // 4 + 4 + padding + jumptable
int source_pc = code.getPc(source);
if (((source_pc + 1) % 4) != 0) {
// need padding
sz += (4 - ((source_pc + 1) % 4));
}
if (jmp != null) {
sz += 8 * (jmp.length);
}
return sz;
}
public static void main(String argv[]) throws jasError, IOException {
// CodeAttr's contain the body of
// a method.
CodeAttr init = new CodeAttr();
init.addInsn(new Insn(opc_aload_0));
init.addInsn(new Insn(opc_invokenonvirtual, new MethodCP("java/lang/Object", "<init>", "()V")));
init.addInsn(new Insn(opc_return));
// ClassEnv's are used as a container
// to hold all information about a class.
ClassEnv nclass = new ClassEnv();
nclass.setClass(new ClassCP("out"));
nclass.setSuperClass(new ClassCP("java/lang/Object"));
// Add the init code to the class.
nclass.addMethod((short) ACC_PUBLIC, "<init>", "()V", init, null);
// write it all out
nclass.write(new DataOutputStream(new FileOutputStream("out.class")));
}
int size(ClassEnv ce, CodeAttr code) throws jasError
// the *real* reason for making it a
// method..
{
int sz = 12; // 4+4+4+jmptable+padding...
int source_pc = code.getPc(source);
if (((source_pc + 1) % 4) != 0) { // need padding
sz += (4 - ((source_pc + 1) % 4));
}
if (jmp != null) {
sz += 4 * (jmp.length);
}
return sz;
}
void write(ClassEnv e, CodeAttr ce, DataOutputStream out) throws IOException, jasError {
int pad;
int source_pc = ce.getPc(source);
if (((source_pc + 1) % 4) != 0) { // need padding
pad = (4 - ((source_pc + 1) % 4));
for (int x = 0; x < pad; x++) out.writeByte(0);
}
dflt.writeWideOffset(ce, source, out);
out.writeInt(min);
out.writeInt(max);
int cnt = jmp.length;
for (int x = 0; x < cnt; x++) {
jmp[x].writeWideOffset(ce, source, out);
}
}
public void emitTestIf(Variable incoming, Declaration decl, Compilation comp) {
CodeAttr code = comp.getCode();
if (incoming != null) code.emitLoad(incoming);
if (decl != null) {
code.emitDup();
decl.compileStore(comp);
}
comp.compileConstant(this);
code.emitSwap();
code.emitInvokeVirtual(isInstanceMethod);
code.emitIfIntNotZero();
}
void write(ClassEnv e, CodeAttr ce, DataOutputStream out) throws IOException, jasError {
int pad;
int source_pc = ce.getPc(source);
if (((source_pc + 1) % 4) != 0) { // need padding
pad = (4 - ((source_pc + 1) % 4));
for (int x = 0; x < pad; x++) out.writeByte(0);
}
// write offset to default
// as a 4 byte signed value
dflt.writeWideOffset(ce, source, out);
if (jmp == null) {
out.writeInt(0);
} else {
out.writeInt(jmp.length);
for (int x = 0; x < jmp.length; x++) {
out.writeInt(match[x]);
jmp[x].writeWideOffset(ce, source, out);
}
}
}