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Parker TenBroeck 2025-05-01 11:11:04 -04:00
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commit 190c9814cf
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src/generators/loadtime/future/FutureSMBuilder.java Normal file
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package generators.loadtime.future;
import future.Future;
import future.Waker;
import generators.loadtime.*;
import java.lang.classfile.*;
import java.lang.constant.ClassDesc;
import java.lang.constant.ConstantDescs;
import java.lang.constant.MethodTypeDesc;
import java.util.List;
public class FutureSMBuilder extends StateMachineBuilder {
public final static ClassDesc CD_Future = ClassDesc.ofDescriptor(Future.class.descriptorString());
public final static ClassDesc CD_Waker = ClassDesc.ofDescriptor(Waker.class.descriptorString());
public final static ClassDesc CD_Pending = ClassDesc.ofDescriptor(Future.Pending.class.descriptorString());
public final static MethodTypeDesc MTD_Future_Obj = MethodTypeDesc.of(CD_Future, ConstantDescs.CD_Object);
public final static MethodTypeDesc MTD_Future = MethodTypeDesc.of(CD_Future);
public final static MethodTypeDesc MTD_Object_Waker = MethodTypeDesc.of(ConstantDescs.CD_Object, CD_Waker);
public final static MethodTypeDesc MTD_Obj = MethodTypeDesc.of(ConstantDescs.CD_Object);
public final static String AWAITING_FIELD_NAME = "awaiting";
static class AwaitHandler implements SpecialMethodHandler{
final StateBuilder.State awaiting;
final Label save_label;
final Label resume_inline;
public AwaitHandler(StateMachineBuilder smb, CodeBuilder cob, StateBuilder sb) {
awaiting = sb.create(cob);
save_label = cob.newLabel();
resume_inline = cob.newLabel();
}
public ReplacementKind replacementKind(){return ReplacementKind.Immediate;}
@Override
public void build_prelude(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {
cob.labelBinding(save_label);
var sst = new SavedStateTracker();
frame.save_locals(smb, cob, sst,2);
cob.storeLocal(TypeKind.REFERENCE, frame.locals().length+2);
frame.save_stack(smb, cob, sst,1);
cob.loadLocal(TypeKind.REFERENCE, frame.locals().length+2);
cob.areturn();
awaiting.bind(cob);
sst.restore_all(smb, cob);
cob.goto_(resume_inline);
}
@Override
public void build_inline(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {
// [... Future]
var start = cob.newBoundLabel();
cob.dup().aload(1).invokeinterface(CD_Future, "poll", MTD_Object_Waker).dup().instanceOf(CD_Pending);
// [... Future Polled is_pending]
cob.ifThenElse(bcb -> {
awaiting.setState(smb, cob);
// [... Future Polled]
bcb.swap().aload(0).swap().putfield(smb.CD_this, AWAITING_FIELD_NAME, CD_Future);
// [... Polled]
cob.goto_(save_label).labelBinding(resume_inline);
bcb.aload(0).getfield(smb.CD_this, AWAITING_FIELD_NAME, CD_Future);
bcb.aload(0).aconst_null().putfield(smb.CD_this, AWAITING_FIELD_NAME, CD_Future);
bcb.goto_(start);
}, bcb -> {
bcb.swap().pop();
});
// [... Polled]
}
}
static class YieldHandler implements SpecialMethodHandler {
final StateBuilder.State resume;
final Label save_ret;
final Label end;
public YieldHandler(StateMachineBuilder smb, CodeBuilder cob, StateBuilder sb) {
resume = sb.create(cob);
save_ret = cob.newLabel();
end = cob.newLabel();
}
public ReplacementKind replacementKind(){return ReplacementKind.Immediate;}
@Override
public void build_prelude(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {
cob.labelBinding(save_ret);
var saved = frame.save(smb, cob, 2, 0);
resume.setState(smb, cob);
cob.getstatic(CD_Pending, "INSTANCE", CD_Pending).areturn();
resume.bind(cob);
saved.restore_all(smb, cob);
cob.goto_(end);
}
@Override
public void build_inline(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {
cob.goto_(save_ret);
cob.labelBinding(end);
}
}
static class WakerHandler implements SpecialMethodHandler{
protected WakerHandler(StateMachineBuilder smb, CodeBuilder cob, StateBuilder sb) {}
@Override
public void build_prelude(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {}
@Override
public void build_inline(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {
cob.aload(1);
}
@Override
public ReplacementKind replacementKind() {
return ReplacementKind.Immediate;
}
}
static class RetHandler implements SpecialMethodHandler{
protected RetHandler(StateMachineBuilder smb, CodeBuilder cob, StateBuilder sb) {}
public ReplacementKind replacementKind(){return ReplacementKind.ReplacingNextReturn;}
@Override
public void build_prelude(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {}
@Override
public void build_inline(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {
cob.aload(0).loadConstant(-1).putfield(smb.CD_this, STATE_NAME, TypeKind.INT.upperBound()).areturn();
}
}
static class RetVoidHandler implements SpecialMethodHandler{
protected RetVoidHandler(StateMachineBuilder smb, CodeBuilder cob, StateBuilder sb) {}
public ReplacementKind replacementKind(){return ReplacementKind.ReplacingNextReturn;}
@Override
public void build_prelude(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {
cob.aload(0).loadConstant(-1).putfield(smb.CD_this, STATE_NAME, TypeKind.INT.upperBound()).aconst_null().areturn();
}
@Override
public void build_inline(StateMachineBuilder smb, CodeBuilder cob, Frame frame) {
}
}
@Override
protected String uniqueName() {
return "Fut";
}
@Override
protected void buildStateMachineMethod(ClassBuilder clb){
clb.withInterfaces(List.of(clb.constantPool().classEntry(CD_Future)));
clb.withMethod("poll", MTD_Object_Waker, ClassFile.ACC_PUBLIC, mb -> mb.withCode(cob -> {
cob.localVariable(1, "waker", CD_Waker, cob.startLabel(), cob.endLabel());
buildStateMachineMethodCode(clb, cob, 2);
}));
clb.withMethod("cancel", MethodTypeDesc.of(ConstantDescs.CD_void), ClassFile.ACC_PUBLIC, mb -> mb.withCode(cob -> {
cob.aload(0).getfield(CD_this, AWAITING_FIELD_NAME, CD_Future).dup().ifThen(Opcode.IFNONNULL, boc -> {
boc.invokeinterface(CD_Future, "cancel", MethodTypeDesc.of(ConstantDescs.CD_void))
.aload(0).aconst_null().putfield(CD_this, AWAITING_FIELD_NAME, CD_Future).return_();
});
cob.pop().return_();
}));
clb.withField(AWAITING_FIELD_NAME, CD_Future, ClassFile.ACC_PRIVATE);
}
public FutureSMBuilder(ClassModel src_clm, MethodModel src_mem, CodeModel src_com) {
super(src_clm, src_mem, src_com);
smmap.put(new SpecialMethod(CD_Future, "await", MTD_Obj), AwaitHandler::new);
smmap.put(new SpecialMethod(CD_Future, "ret", MTD_Future_Obj), RetHandler::new);
smmap.put(new SpecialMethod(CD_Future, "ret", MTD_Future), RetVoidHandler::new);
smmap.put(new SpecialMethod(CD_Future, "yield", ConstantDescs.MTD_void), YieldHandler::new);
smmap.put(new SpecialMethod(CD_Waker, "waker", MethodTypeDesc.of(CD_Waker)), WakerHandler::new);
}
}