/** @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); } }
/** * load item with register reg. Assumes that reg is properly allocated * * @param ec current emitter context * @param reg register to load the item to */ final void loadTo(EmitterContext ec, X86Register.GPR reg) { if (VmUtils.verifyAssertions()) VmUtils._assert(reg != null, "Reg != null"); final X86Assembler os = ec.getStream(); final X86RegisterPool pool = ec.getGPRPool(); final VirtualStack stack = ec.getVStack(); final X86CompilerHelper helper = ec.getHelper(); if (VmUtils.verifyAssertions()) { VmUtils._assert(!pool.isFree(reg), "reg not free"); } switch (getKind()) { case Kind.GPR: if (this.gpr != reg) { os.writeMOV(reg.getSize(), reg, this.gpr); cleanup(ec); } break; case Kind.LOCAL: os.writeMOV(reg.getSize(), reg, helper.BP, getOffsetToFP(ec)); break; case Kind.CONSTANT: loadToConstant(ec, os, reg); break; case Kind.FPUSTACK: // Make sure this item is on top of the FPU stack FPUHelper.fxch(os, stack.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); os.writePOP(reg); break; case Kind.STACK: // TODO: make sure 'this' is on top of stack // TODO: implemen it for 64 bits if (!stack.operandStack.isTos(this)) { int stack_loc = stack.operandStack.stackLocation(this); if (stack_loc < 0) throw new StackException("Item not found on stack"); stack.operandStack.makeTop(stack_loc); // todo test it os.writeMOV( org.jnode.vm.x86.compiler.X86CompilerConstants.BITS32, reg, helper.SP, helper.SLOTSIZE); os.writeXCHG( helper.SP, org.jnode.vm.x86.compiler.X86CompilerConstants.BITS32 * stack_loc, reg); os.writeMOV( org.jnode.vm.x86.compiler.X86CompilerConstants.BITS32, helper.SP, helper.SLOTSIZE, reg); } if (VirtualStack.checkOperandStack) { stack.operandStack.pop(this); } os.writePOP(reg); break; default: throw new IllegalArgumentException("Invalid item kind"); } setKind(Kind.GPR); this.gpr = reg; }