/** @see org.jnode.vm.x86.compiler.l1a.Item#push(EmitterContext) */
final void push(EmitterContext ec) {
final X86Assembler os = ec.getStream();
final VirtualStack stack = ec.getVStack();
final X86CompilerHelper helper = ec.getHelper();
switch (getKind()) {
case Kind.GPR:
os.writePUSH(gpr);
break;
case Kind.LOCAL:
os.writePUSH(helper.BP, getOffsetToFP(ec));
break;
case Kind.CONSTANT:
pushConstant(ec, os);
break;
case Kind.FPUSTACK:
// Make sure this item is on top of the FPU stack
final FPUStack fpuStack = stack.fpuStack;
FPUHelper.fxch(os, fpuStack, this);
stack.fpuStack.pop(this);
// Convert & move to new space on normal stack
os.writeLEA(helper.SP, helper.SP, -helper.SLOTSIZE);
popFromFPU(os, helper.SP, 0);
break;
case Kind.STACK:
// nothing to do
if (VirtualStack.checkOperandStack) {
// the item is not really pushed and popped
// but this checks that it is really the top
// element
stack.operandStack.pop(this);
}
break;
default:
throw new IllegalArgumentException("Invalid item kind");
}
cleanup(ec);
setKind(Kind.STACK);
if (VirtualStack.checkOperandStack) {
stack.operandStack.push(this);
}
}
/** @see org.jnode.vm.x86.compiler.l1a.Item#pushToFPU(EmitterContext) */
final void pushToFPU(EmitterContext ec) {
final X86Assembler os = ec.getStream();
final VirtualStack stack = ec.getVStack();
final X86CompilerHelper helper = ec.getHelper();
switch (getKind()) {
case Kind.GPR:
os.writePUSH(gpr);
pushToFPU(os, helper.SP, 0);
os.writeLEA(helper.SP, helper.SP, helper.SLOTSIZE);
break;
case Kind.LOCAL:
pushToFPU(os, helper.BP, getOffsetToFP(ec));
break;
case Kind.CONSTANT:
pushConstant(ec, os);
pushToFPU(os, helper.SP, 0);
os.writeLEA(helper.SP, helper.SP, helper.SLOTSIZE);
break;
case Kind.FPUSTACK:
// Assert this item is at the top of the stack
stack.fpuStack.pop(this);
stack.fpuStack.push(this);
return;
// break;
case Kind.STACK:
if (VirtualStack.checkOperandStack) {
stack.operandStack.pop(this);
}
pushToFPU(os, helper.SP, 0);
os.writeLEA(helper.SP, helper.SP, helper.SLOTSIZE);
break;
default:
throw new IllegalArgumentException("Invalid item kind");
}
cleanup(ec);
setKind(Kind.FPUSTACK);
stack.fpuStack.push(this);
}
